The present invention relates to a door entrance system for connecting a first area with a first air pressure and a second area with a second air pressure.

Background of the invention

A door entrance system typically is used for allowing people or vehicles to enter and leave public buildings such as stores, offices, garages and museums etc., where a large number of persons pass through each day. Buildings in areas with high pollution can have problems with polluted air entering into the buildings and the door entrance system is one of the openings in the buildings where the pollution enters since the doors of the door entrance system is opened and closed frequently.

The pollution can for instance relate to buildings in cities with general smog problems, building located next to roads with high traffic or buildings located close to areas with a high concentration of allergenic particles (or other particles) that enters into the building. To create a sustainable environment for the people working and living in such buildings there is thus a need for such polluted air to be kept out of, or at least reducing the amount entering, the building or to be removed if already contaminated air has entered into the door entrance system.

Summary of the invention

An object of the present disclosure is to provide a door entrance system, which seek to mitigate, alleviate, or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination.

An object of the present disclosure is to provide a door entrance system that reduces the amount of polluted air entering through the door entrance system from one area into another area that the door entrance system is operated between.

An object of the present disclosure is to provide a door entrance system that is a part of the ventilation system of a building and that contributes to keeping the air fresh and clean in a building.

In this disclosure, a solution to the problem outlined above is proposed. In the proposed solution, a door entrance system for connecting a first area with a first air pressure and a second area with a second air pressure is disclosed. The door entrance system comprise a third area with a third air pressure comprising a first opening configured to be connected to the first area and a second opening configured to be connected to the second area; a first air pressure sensor configured to measure the first air pressure of the first area; a third air pressure sensor configured to measure the third air pressure of the third area; and an air pressure regulating unit connected to the first and third air pressure sensor and configured to regulate the third air pressure of the third area to be higher than the first air pressure such that air from the first area is prevented from entering into the third area.

By the door entrance system according to the above air from the first area is restricted to enter into the third area and thereby is also pollution from the first area restricted to enter via the door entrance system and pollute the second area. A further advantage is that the door entrance system could be used in enhancing the air quality of a building in an efficient and robust way.

According to an aspect the third area is configured to be connected to a ventilation system and the air pressure regulating unit is configured to regulate the ventilation system to regulate the third air pressure of the third area. The ventilation system is a robust and efficient way of regulating the third air pressure.

According to an aspect the door entrance system is configured to be mounted in a building and the ventilation system is configured to ventilate the building. By using the ventilation system of the building the ventilation system could be used for different things which reduce the costs for the system.

According to an aspect the door entrance system comprise an air pressure unit configured to change the third air pressure of the third area and wherein the air pressure regulating unit is connected to the air pressure unit and configured to regulate the air pressure unit to change the third air pressure.

According to an aspect the door entrance system comprise a door system comprising two or more door leafs and configured to move the at least two or more door leafs between an open and closed position for opening and closing the first opening and the second opening.

According to an aspect the at least two or more door leafs are configured to, in the closed position, interact with a frame of the door entrance system to close the first opening and the second opening substantially air tight to prevent air from leaking between the first, second and/or third area.

According to an aspect the at least two or more door leafs are configured to close the first opening and the second opening substantially air tight to prevent air from leaking between the first, second and/or third area. According to an aspect the door system comprise one or more of a sectional door, a high speed door, a revolving door, a swing door, a hinged door, an up and over door, a roll door, a garage door, an industrial door, a gate, a barrier, an or any device having the same function as a door.

According to an aspect the door system comprise at least a first door configured to be moved between the open and closed position to open and close the first opening, and at least a second door configured to be moved between the open and closed position to open and close the second opening.

According to an aspect the door system comprises a revolving door configured to be moved between the open and closed position to open and close the first opening and the second opening.

According to an aspect the door entrance system comprise a second air pressure sensor configured to measure the second air pressure of the second area.

According to an aspect the air pressure regulating unit is connected to the second air pressure sensor and configured to regulate the third air pressure of the third area to be equal to or lower than the second air pressure.

According to an aspect the air pressure regulating unit is connected to the second air pressure sensor and configured to regulate the third air pressure of the third area to be higher than the second air pressure.

According to an aspect the door entrance system comprise an air pollution sensor configured to measure the amount of pollution in the air in the first area and/or third area and wherein the air pressure regulating unit is configured to regulate the third air pressure based on input from the air pollution sensor.

According to an aspect the door system is configured to regulate the movement of the door leafs at least based on input from one or more of the first air pressure sensor, the second air pressure sensor, the third air pressure sensor and the air pollution sensor. By regulating the movement of the door leafs based on input from the sensors, the door leafs could be regulated not to open if the difference in air pressure is not correct or if the air in some area comprise to much pollution to avoid that air enters from the first area to the second area.

In this disclosure, a further solution to the problem outlined above is proposed.

In the proposed solution, a method for regulating a door entrance system according to the above is disclosed comprising the steps: measuring, in the first air pressure sensor, the first air pressure in the first area, measuring, in the third air pressure sensor, the third air pressure in the third area, comparing, in the air pressure regulating unit, the third air pressure with the first air pressure, and regulating the third air pressure to be higher than the first air pressure.

According to an aspect the method further comprise the steps of: measuring, in the second air pressure sensor, the second air pressure in the second area, comparing, in the air pressure regulating unit, the third air pressure with the second air pressure, and regulating the third air pressure to be higher than the second air pressure.

According to an aspect the method further comprise the steps of: measuring, in the second air pressure sensor, the second air pressure in the second area, comparing, in the air pressure regulating unit, the third air pressure with the second air pressure, and regulating the third air pressure to be equal to or lower than the second air pressure.

The first, second and third area are areas and the air pressure of an area is the air pressure at that area. Put in another way, the air pressure of an area in this application is the air pressure of the air at the area. Put in yet another way, the air pressure of an area is the air pressure in the volume of air above the area.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [element, device, component, means, etc.]" are to be interpreted openly as referring to at least one instance of said element, device, component, means, etc., unless explicitly stated otherwise. Further, by the term “comprising” it is meant“comprising but not limited to” throughout the application.

Brief description of the drawings

The foregoing will be apparent from the following more particular description of the example embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the example embodiments and aspects.

Figure 1 discloses a schematic view of a door entrance system according to an aspect of the invention arranged in a building and its surroundings.

Figure 2 disclose a front schematic view of a door entrance system according to an aspect of the invention comprising a sliding door system.

Figure 3 disclose a schematic view of a door entrance system according to an aspect of the invention comprising a revolving door system in an open position. Figure 4 disclose a schematic view of the door entrance system in fig. 3 comprising the revolving door system in a closed position.

Figure 5a-d discloses a schematic view of a door entrance system according to an aspect of the invention comprising a sliding door system in an open, two

intermediate and a closed position.

Figure 6 disclose a method according to an aspect of the invention.

Detailed description

Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying figures. The assembly disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein.

The terminology used herein is for the purpose of describing particular aspects of the disclosure only, and is not intended to limit the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present invention relates to door entrance systems that is mounted in buildings and that allows people to enter and leave the building in an easy and efficient manner.

In fig 1 a door entrance system 1 is disclosed. The door entrance system 1 is arranged in a building 60. The building 60 is located close to a road 100 where vehicles 101 pass by. The building 60 is also located close to trees 102, which at some parts of the year releases particles in the form of pollen.

The door entrance system 1 is mounted in the building 60 and connects a first area 10 and a second area 20. The first area 10 is according to an aspect the outside 10 of the building and the second area 20 is the inside 20 of the building 60. According to an aspect the door entrance system 1 is according to an aspect arranged inside a building 60 and the first and second areas 10, 20 are different rooms or areas in the building 60.

The first area 10 has a first air pressure P1. The second area 20 has a second air pressure P2. When the first area 10 is the outside the first air pressure P1 is the outside air pressure. When the second area 10 is the inside of the building the second air pressure P1 is the air pressure in the building. The first and second air pressures P1 , P2 depends on many different things such as weather, temperature, wind and ventilation systems. However, the first and second air pressures P1 , P2 also depends on persons and vehicles passing or entering the door entrance system 1 , elevators moving in the building 60 etc. The first and second air pressures P1 , P2 thus constantly changes in the first and second area 10, 20 in front of the door entrance system 1.

The door entrance system 1 comprises, as disclosed in fig 1 -5, a third area 30, a first air pressure sensor 11 , a third air pressure sensor 33 and an air pressure regulating unit 40.

The third area 30 is an area between the first area 10 and the second area 20. According to an aspect the third area 30 is a vestibule or a hall in the door entrance system 1. The third area 30 has a third air pressure P3. The third area 30 comprises a first opening 31 and a second opening 32. The first opening 31 is configured to be connected to the first area 10. The second opening 32 is configured to be connected to the second area 20 to connect the door entrance system 1 to the first area 10. When a person or a vehicle in the first area 10 enters into the second area 20 via the door entrance system 1 , the person or vehicle passes through the first opening 31 into the third area 33 and thereafter leaves the third area 33 by passing through the second opening 32 and entering into the second area 20. The door entrance system 1 is also suitable for persons and vehicles to pass through the door entrance system 1 in the opposite direction, i.e. from the second area 20 to the first area 10. Put in another way, the door entrance system 1 is configured to assist persons or vehicles to pass it in both directions.

The first and second area 10, 20 are according to an aspect the area directly in front of the first and second opening 31 , 32. The size of the first and second areas could vary from different systems and could be set/adjusted based on the location at which the door entrance system is installed and its surroundings. The first air pressure sensor 11 is configured to measure the first air pressure P1 of the first area 10. The first air pressure sensor 11 is according to an aspect mounted on/connected to a door leaf 71 of the door entrance system 1. The first air pressure sensor 1 1 is according to an aspect mounted on/connected to a frame 2 of the door entrance system 1. The first air pressure sensor 1 1 is according to an aspect mounted at a distance from the third area 30 and comprises a wireless connection.

The third air pressure sensor 33 is configured to measure the third air pressure P3 of the third area 30. According to an aspect the third air pressure sensor 33 is mounted in the third area 30. According to an aspect the third air pressure sensor 33 is mounted on a wall 3 defining the third area 30 together with the first and second opening 31 , 32. According to an aspect the third air pressure sensor 33 is mounted on one of the door leafs 71. According to an aspect the third air pressure sensor 33 is mounted at the first opening 31. According to an aspect the third air pressure sensor 33 comprises a wireless connection.

Air pressure sensors 11 , 33 as such is known in the art and is thus not further described herein. The first, second and third area 10, 20, 30 are areas and the air pressure of an area is the air pressure at that area. Put in another way, the air pressure of an area in this application is the air pressure of the air at the area. Put in yet another way, the air pressure of an area is the air pressure in the volume of air above the area

The air pressure regulating unit 40, as disclosed in fig 2, is connected to the first and third air pressure sensor 11 , 33. The air pressure regulating unit 40 is configured to regulate the third air pressure P3 of the third area 30. The air pressure regulating unit 40 is configured to regulate the third air pressure P3 of the third area 30 to be higher than the first air pressure P1. According to an aspect the air pressure regulating unit 40 is configured to increase and decrease the third air pressure P3 of the third area 30. As the third air pressure P3 is larger/higher than the first air pressure P1 , air from the first area 10 is prevented from entering into the third area 30, as is disclosed by arrows in fig 3, 4 and 5. By having a higher third air pressure P3 in the door entrance system 1 than in the first air pressure P1 air comprising pollution is restricted from entering into the first opening 31 into the third area 33 and forward through the second opening 32 and into the second area 20. Air from the third area 30 could move from the third area 30 into the first area 10 due to the difference between the first air pressure P1 and the third air pressure P3. If polluted air has entered into the third area 30 this difference could be used to remove the polluted air from the door entrance system 1.

The air pressure regulating unit 40 receives the first and the third air pressure P1 , P3 from the first and third air pressure sensors 11 , 33. If the third air pressure P3 is lower than the first air pressure P1 the air pressure regulating unit 40 increases the third air pressure P3 to become higher. As the different first and third air pressure P1 , P3 constantly changes the air pressure regulating unit 40 regulates the third air pressure P3 on a regular basis to restrict air from entering from the first area 10 to the third area 20. According to an aspect the amount or level of difference that the air pressure regulating unit 40 should regulate the third air pressure P3 to could be set to be different and be changed over time in the air pressure regulating unit 40.

According to an aspect the door entrance system 1 comprise an air pollution sensor 80. The air pollution sensor 80 is according to an aspect configured to measure the amount of pollution in the air in the first area 10. The air pollution sensor 80 is according to an aspect configured to measure the amount of pollution in the air in the third area 30. The air pollution sensor 80 is according to an aspect configured to measure the amount of pollution in the air in the first area 10 and in the third area 30. Air pollution sensors 80 as such is known in the art and is thus not further described herein.

According to an aspect the air pressure regulating unit 40 is configured to regulate the third air pressure P3 based on input from the air pollution sensor 80. If the air pollution sensor 80 senses a high amount of pollution in the air in the first area 10 the air pressure regulating unit 40 could regulate the difference in air pressure between the first air pressure P1 and the third air pressure P3 to be higher than if there is a low concentration to further reduce the risk of that polluted air enters into the third area 30. If for instance the first air pressure P1 increases rapidly, due to a wind gust or a vehicle passing by, there is a risk of that the air pressure regulating unit 40 is not able to regulate the third air pressure P3 at the same speed and some air from the first area 10 may enter into the third area 30. However, if the difference in air pressure is higher, the air pressure regulating unit 40 will have more time to regulate the third air pressure P3 before the first air pressure P1 increases to be equal or higher than the third air pressure P3. This increases the robustness of the functionality of the door entrance system 1. According to an aspect the third area 30 is configured to be connected to a ventilation system 50. According to an aspect the ventilation system 50 that the door entrance system 1 is connected to is the ventilation system 50 of the building 60. According to an aspect the air pressure regulating unit 40 is configured to regulate the ventilation system 50 to regulate the third air pressure P3 of the third area 30. Air from the ventilation system 50 can be moved into the third area 30 to increase the third air pressure P3 in the third area 30. Air from the third area 30 could also be moved back into the ventilation system 50. According to an aspect if the air pollution sensor 80 senses that polluted air have entered into the third area 30, the air regulating unit 40 regulates the ventilation system 50 to suck in the polluted air and handles it in the ventilation system 50. This is an additional measure for restricting polluted air from the first area 10 to enter into the third area 30 and the second area 20. The ventilation system 50 is adapted to clean the polluted air before it is reused or emitted into the outside. By using the existing ventilation system 50 of the building 60 the costs of regulating the third air pressure P3 could be reduced. Further, by connecting the ventilation system 50 to the door entrance system 1 polluted air could be handled in the same system as the air in the building 60 is handled.

According to an aspect the door entrance system 1 is configured to be mounted in the building 60 and the ventilation system 50 is configured to ventilate the building 50.

The door entrance system 1 comprises according to an aspect an air pressure unit 41. The air pressure unit 41 is configured to change the third air pressure P3 of the third area 30. The air pressure regulating unit 40 is connected to the air pressure unit 41 , as disclosed in fig 2. The air pressure regulating unit 40 is configured to regulate the air pressure unit 41 to change the third air pressure P3. According to an aspect the air pressure unit 41 is a compressor. According to an aspect the air pressure unit 41 is a fan. According to an aspect the air pressure unit 41 is used in combination with the ventilation system 50. According to an aspect the air pressure unit 41 is used to regulate the third air pressure P3 when the first air pressure P1 changes quickly and the ventilation system 50 is used to ongoing regulate the third air pressure P3 with smaller changes.

According to an aspect the air pressure unit 41 is used without the door entrance system 1 being connected to the ventilation system 50. According to an aspect the door entrance system 1 comprise a second air pressure sensor 21. The second air pressure sensor 21 is configured to measure the second air pressure P2 of the second area 20. The second air pressure sensor 21 is according to an aspect mounted on/connected to a door leaf 71 of the door entrance system 1. The second air pressure sensor 21 is according to an aspect mounted on/connected to the frame 2 of the door entrance system 1. The second air pressure sensor 21 is according to an aspect mounted at a distance from the third area and comprises a wireless connection.

According to an aspect the air pressure regulating unit 40 is connected to the second air pressure sensor 21. The air pressure regulating unit 40 is configured to regulate the third air pressure P3 of the third area 30 to be equal to or lower than the second air pressure P2. According to an aspect the air pressure regulating unit 40 is configured to regulate the third air pressure P3 of the third area 30 to be lower than the second air pressure P2. By regulating the third air pressure P3 to be higher than the first air pressure P1 and equal to or lower than the second air pressure P2 air from the first area 10 is restricted from entering into the second area 20 in two steps, which even further increases the efficiency of the door entrance system 1. The difference in air pressure between the third air pressure P3 and the second air pressure P2 has a corresponding effect as the above described difference between the first air pressure P1 and the third air pressure P3. According to an aspect the air pressure regulating unit 40 is configured to not regulate the third air pressure P3 in relation to the second air pressure P2 if this would lead to that a contradiction of the difference in air pressure between the first air pressure P1 and the third air pressure P3.

According to an aspect the air pressure regulating unit 40 is connected to the second air pressure sensor 21 and configured to regulate the third air pressure P3 of the third area 30 to be higher than the second air pressure P2. By regulating the third air pressure P3 in accordance to this air from the second area 20 is restricted to enter into the third area 30. This could be useful it there are large differences in temperature between the first and second area 10, 20 and the third area 30 will act as an air lock between the first and second area 10, 20.

According to an aspect the door entrance system 1 comprise a door system 70. The door system 70 comprises two or more door leafs 71. The door system 70 is according to an aspect configured to move the at least two or more door leafs 71 between an open and closed position O, C for opening and closing the first opening 31 and the second opening 32.

According to an aspect the at least two or more door leafs 71 are configured to close the first opening 31 and the second opening 32 substantially air tight to prevent air from leaking between the first, second and/or third area 10, 20, 30.

According to an aspect the at least two or more door leafs 71 are configured to, in the closed position C, interact with a frame 2 of the door entrance system 1 to close the first opening 31 and the second opening 32 substantially air tight to prevent air from leaking between the first, second and/or third area 10, 20, 30.

According to an aspect, as disclosed in fig 3 and 4, the door entrance system 1 comprise the door system 70 comprising a revolving door 72. The revolving door 71 is configured to be moved between the open and closed position O, C to open and close the first opening 31 and the second opening 32. The revolving door 72 as such is well known in the art and will not be described further here in. The revolving door 72 comprise four door leafs 71. The door leafs 71 are connected in a cross shape and arranged to rotate about its axle. When the door leafs 71 are rotated and moves between the closed and open position C, O they open, disclosed in fig 3, and close, disclosed in fig 4, the first opening 31 and the second opening 32. When the revolving door 72 is in the open position O the higher third air pressure P3 in view of the first air pressure restricts air from entering through the first opening 31 and into the third area 30. According to an aspect the difference in air pressure between the first and the third air pressure P1 , P3 is increased to counteract any drag that the door leafs 71 create and restrict the door leafs 71 from pushing/dragging in air from the first area 10 to the third area 30. In the closed position C and if the door entrance system 1 is not activated to be opened, the difference in air pressure between the first air pressure P1 and the third air pressure P3 could be reduced (or evened out) to save energy and air from the first area 10 could be allowed to enter into the third area 30 between two door leafs 71 without any risk of the air being conveyed into the second area 20. When the door entrance system 1 is activated the air pressure regulating unit 40 regulates the third air pressure P3 to again be higher than the first air pressure P1 , and thus pushes any polluted air back into the first area 10 before the revolving door 72 starts moving. According to an aspect the air pressure regulating unit 40 regulates the door system 70 not to move the door leafs 71 unless or until the difference in air pressure is correct. According to an aspect the air pressure regulating unit 40 regulates the door system 70 not to move the door leafs 71 if the amount of pollution in the air is above a certain level.

According to an aspect the third area 30 is divided into two different sub areas, one at the first opening 31 and a second at the second opening 32. By having sub areas the difference between the firs air pressure P1 and the second air pressure P2 and the third air pressure P3 can be even further optimized to restrict air from the first area 10 to enter into the third area and the second area 20.

According to an aspect the door system 70 comprise one or more of a sectional door, a high speed door, a revolving door, a swing door, a hinged door, an up and over door, a roll door, a garage door, an industrial door, a gate, a barrier, an or any device having the same function as a door.

According to an aspect, as disclosed in fig 5a-5d, the door system 70 comprises at least a first door 70a and at least a second door 70b. The first door 70a is configured to be moved between the open and closed position O, C to open and close the first opening 31. According to an aspect the first door 70a is connected to the frame 2 at the first opening 31. According to an aspect the first door 70a is a sliding door comprising two door leafs 71. According to an aspect the first door 70a is one or more of a sectional door, a high speed door, a revolving door, a swing door, a hinged door, an up and over door, a roll door, a garage door, an industrial door, a gate, a barrier, an or any device having the same function as a door.

The second door 70b is configured to be moved between the open and closed position O, C to open and close the second opening 32. According to an aspect the second door 70b is connected to the frame 2 at the second opening 32. According to an aspect the first door 70a is a sliding door comprising two door leafs 71. According to an aspect the second door 70b is one or more of a sectional door, a high speed door, a revolving door, a swing door, a hinged door, an up and over door, a roll door, a garage door, an industrial door, a gate, a barrier, an or any device having the same function as a door.

When a person is approaching the first door 70a the door system 70 identifies the person. The first air pressure sensor 11 senses the first air pressure P1 and the third air pressure sensor 33 senses the third air pressure P3. The air pressure regulating unit 40 thereafter compares the first and the third air pressure P1 , P3 and regulates the third air pressure P3 to be higher than the first air pressure P1. The door leafs 71 of the first door 70a thereafter slides in opposite direction to move from their closed position C, as disclosed in fig 5a, to its open position O, as disclosed in fig 5b. The person can now enter from the first area 10 through the first opening 31 and walk into the third area 30. The higher third air pressure P3 compared to the first air pressure P1 restricts any air from the first area 10 to enter into the third area 30, as is disclosed by the arrow in fig 5b, even though the door leafs 71 are in their open position O. When the person has entered into the third area 30 the door leafs 71 of the first door 70a slides in the opposite direction to close the first opening 31 , as is disclosed in fig 5c. As the person approaches the second door 70b, the third air pressure sensor 33 and the second air pressure sensor 21 will sense the second and third air pressure P2, P3. The air pressure regulating unit 40 receives the value of the second and third air pressure P2, P3 and compare the second and third air pressure P2, P3 and regulates the third air pressure P3 based on the comparison. The third air pressure P3 is regulated by air pressure regulating unit 40 regulating the ventilation system 50 and/or the air pressure unit 41. The second door 70b is there after opened by sliding the door leafs 71 in an opposite direction to the open position O, as disclosed in fig 5d. The difference in air pressure between the third air pressure P3 and the second air pressure P2 will restrict movement of air between the third and second area 30, 20.

According to an aspect the third air pressure P3 is regulated to be higher than the second air pressure P2 such as air from the second area 20 is restricted from entering from the second area 20 to the third area 30 as disclosed by the arrow A in fig 4.

According to an aspect the third air pressure P3 is regulated to be lower than the second air pressure P2 such as air from the third area 30 is restricted from entering from the third area 30 to the second area 20 as disclosed by the arrow B in fig 4.

According to an aspect if several individuals is using the door entrance system 1 at the same time, both the first door 70a and the second door 70b could be arranged in the open position O at the same time and the air pressure regulating unit 40 will regulate the third air pressure P3 to restrict air from entering from the first area 10 through the first opening 31 into the third area 30 and thereafter from the third area 30 through the second opening 32 into the second area 20.

According to an aspect if the speed that individuals should be allowed to enter through the door entrance system 1 is high both the first door 70a and the second door 70b could be arranged in the open position O at the same time and the air pressure regulating unit 40 will regulate the third air pressure P3 to restrict air from entering from the first area 10 through the first opening 31 into the third area 30 and thereafter from the third area 30 through the second opening 32 into the second area 20.

According to an aspect the door system 70 is configured to regulate the movement of the door leafs 71 at least based on input from one or more of the first air pressure sensor 11 , the second air pressure sensor 21 , the third air pressure sensor 31 and the air pollution sensor 80.

According to an aspect to door entrance systems for different types of doors, door sets and door leafs. More specifically, the invention relates to door entrance systems for any type of door, a sectional door, a high speed door, a gate or barrier obstructing passage, such as a revolving door, a swing door, a hinged door, an up and over door, a roll door, a garage door, an industrial door, a gate, a barrier, an or any device having the same function as a door.

According to an aspect the air pressure regulating unit 40 is connected to a data server 103 and/or a cloud service 104 via a wireless connection 105, as disclosed in fig 2. According to an aspect the air pressure regulating unit 40 is connected to the wireless connection 105. According to an aspect the air pressure regulating unit 40 is configured to receive pollution levels and/or air pressure levels in the first area 10 from the data server 103 or the cloud service and to regulate the third air pressure P3 based on the received pollution levels. If the received pollution levels are high, the difference in air pressure between the first and third area could be increased to reduce the risk of that air from the first area enters into the third area. If the received pollution levels are low, the difference in air pressure between the first and third area could be reduced to save energy.

According to an aspect the wireless connection 105 comprise a radio communication interface. The radio communication interface 105 may be comprised as any number of tranceiving, receiving, and/or transmitting units or circuitry. It should further be appreciated that the radio communication interface may be in the form of any input/output communications port known in the art. The radio communication interface may comprise RF circuitry and baseband processing circuitry. The radio communication interface may support either wireless and/or wired communication. Examples of wireless communication may be Global System for Mobile

Communication, GSM, Bluetooth, narrowband communication, Internet of Things, loT, specific communication. According to an aspect the radio communication interface is configured to send data associated with the door entrance system 1 to one or more remote entity.

According to an aspect the data is pollution levels in one or more of the different areas 10, 20, 30. According to an aspect the data is air pressure levels in one or more of the different areas 10, 20, 30.

According to an aspect, the one or more remote entity is a server, a data base, a further door entrance system 1 and/or the cloud.

According to an aspect the door entrance system further comprises a wireless connection interface suitable for sending electronic signals. Examples of wireless connections are BluetoothTM, WiFi, Infrared or any kind of near field communication technology.

According to an aspect the air pressure regulating unit 40 comprise a central processor unit (CPU) and a memory (not disclosed).

According to an aspect, the first, second and third air pressure sensor 1 1 , 21 , 33 and/or the air pollution sensor 80 comprises a wireless connection unit suitable for sending electronic signals. The connection is a wireless connection. Examples of wireless connections are BluetoothTM, WiFi, Infrared or any kind of near field communication technology.

Flereafter a method for regulating the door entrance system 1 will be described with reference to fig 6. When regulating the third air pressure P3 in the third area 30 of the door entrance system the following steps are performed. The first air pressure P1 in the first area 10 is measured S100, in the first air pressure sensor 11. The third air pressure P3 in the third area 30 is measured S101 , in the third air pressure sensor 31. The third air pressure P3 is compared S102 with the first air pressure P1 in the air pressure regulating unit 40. The third air pressure P3 is thereafter regulated S103 to be higher than the first air pressure P1.

According to an aspect the second air pressure P2 in the second area 20 is measured S104 in the second air pressure sensor 21. The third air pressure P3 is compared S105, with the second air pressure P2 in the air pressure regulating unit 40. The third air pressure P3 is thereafter regulated S106 to be higher than the second air pressure P2.

According to an aspect the second air pressure P2 in the second area 20 is measured S104 in the second air pressure sensor 21. The third air pressure P3 is compared S105, with the second air pressure P2 in the air pressure regulating unit 40. The third air pressure P3 is thereafter regulated S107 to be equal to or lower than the second air pressure P2.

The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, a sliding door set may comprise of more than two sliding door leafs, arranged in the same way as discussed above.

The description of the aspects of the disclosure provided herein has been presented for purposes of illustration. The description is not intended to be exhaustive or to limit aspects of the disclosure to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of various alternatives to the provided aspects of the disclosure. The examples discussed herein were chosen and described in order to explain the principles and the nature of various aspects of the disclosure and its practical application to enable one skilled in the art to utilize the aspects of the disclosure in various manners and with various modifications as are suited to the particular use contemplated. The features of the aspects of the disclosure described herein may be combined in all possible combinations of methods, apparatus, modules, systems, and computer program products. It should be appreciated that the aspects of the disclosure presented herein may be practiced in any combination with each other.

It should be noted that the word“comprising” does not necessarily exclude the presence of other elements or steps than those listed. It should further be noted that any reference signs do not limit the scope of the claims.