TECHNICAL FIELD

The present disclosure relates to ventilation systems for household appliances, in particular dishwashers.

BACKGROUND

Dishwashers may be equipped with an active ventilation system which can be used in a final drying step of a wash cycle to dry clean dishes inside a washing chamber of the dishwasher. A blower or fan of such ventilation system is arranged to remove steam produced inside the washing chamber, and thereby obtain a faster drying process compared to dishwashers relying on passive ventilation.

The active ventilation system is typically arranged inside the door of the washing chamber or in a gap between a wall of the washing chamber and an outer housing of the dishwasher. Consequently, the ventilation system should be relatively flat. Steam inside the washing chamber is sucked into an inlet duct by means of the blower or fan and is thereafter expelled to an environment outside the washing chamber via an outlet. The ventilation system may additionally condense the steam before the expulsion.

The fan or blower is typically not operated during the wash steps of the wash cycle, i.e. , the steps when wash is circulated inside the washing chamber. However, wash water may in any case enter the ventilation system through the inlet duct during the wash steps, which is undesired. The ventilation system may therefore be equipped with a closing member, such as a disc or shutter, configured to obstruct the inlet duct during the wash steps in the wash cycle and configured to open the inlet during the drying step.

A problem with such closing arrangements is poor sealing between the closing arrangement and the inlet duct.

SUMMARY

It is an object of the present disclosure to provide improved ventilation systems for dishwashers, and in particular ventilation systems with improved means for obstructing a duct. This object is obtained at least in part by a ventilation system for a dishwasher. The ventilation system comprises: an impeller configured to, when in operation, feed a flow of fluid; an impeller housing; an inlet chamber fluidly connected to the impeller housing; a first inlet duct arranged in association with the inlet chamber so that, when operating the impeller, a flow of a first fluid is generated through the first inlet duct into the inlet chamber and further into the impeller housing; an outlet duct arranged in association with the impeller housing so that, when operating the impeller, the first fluid in the impeller housing is expelled; a movable closing member for closing the first inlet duct; and actuating means configured to move the movable closing member. The actuating means comprises a linear actuator associated with a contracted state and an expanded state. The actuating means further comprises a connection member connecting the movable closing member and the linear actuator. The movable closing member is positioned so as to close the first inlet duct when the linear actuator is in the contracted state, and wherein the movable closing member is positioned so at to open the first inlet duct when the linear actuator is in the expanded state.

Some linear actuators require constant power to be in the expanded state and require no power to be in the contracted state. It is therefore desired that the linear actuator spend less time in the expanded state than in the contracted state during operation of the dishwasher. In some dishwashers, less time is spent in drying steps of the wash cycle compared to wash steps of the wash cycle. It can therefore be advantageous that the movable closing member is positioned so as to close the first inlet duct, i.e. , configured to obstruct the first inlet duct, when the linear actuator is in the contracted state as this can be more energy efficient.

In addition, some linear actuators are designed to provide a greater pulling force in the contracted state compared to a corresponding pushing force in the expanded state. In other words, such linear actuator can pull a closing member towards itself with greater force than it can push the closing member away from itself. The disclosed ventilation system can therefore provide better sealing between the first inlet duct and the movable closing member when the movable closing member is positioned so as to close the first inlet duct. Less liquid, such as wash water, will therefore leak between the movable closing member and the first inlet duct into the inlet chamber, which is advantageous.

According to aspects, the movable closing member is planar. Alternatively, the movable closing member has have a conical shape. In general, however, the movable closing member preferably has a shape corresponding to the shape of the first inlet duct

According to aspects, the linear actuator is arranged to, when in the contracted state, press the movable closing member against a surface around the first inlet duct. This provides improved sealing of the first inlet duct when the movable closing member is positioned to close the first inlet duct. For example, the movable closing member may be a disc with a larger diameter than a circular aperture of the first inlet duct. In that case, the disc may be press against a circumferential surface around that aperture when positioned to close the first inlet duct.

According to aspects, the ventilation system further comprises sealing means operating between the movable closing member and the first inlet duct, where the sealing means are solidly connected to the movable closing member and/or the first inlet duct. This further improves sealing of the first inlet duct when the movable closing member is positioned to close the first inlet duct.

According to aspects, the linear actuator is a thermal actuator. In that case, the linear actuator may comprise a material capable of expanding when heated. Such material may, e.g., comprise wax. A thermal actuator, in particular a wax thermal actuator, is a low-cost actuator which typically provides a greater pulling force in the contracted state compared to a corresponding pushing force in the expanded state.

According to aspects, the movable closing member is movable at least partially outside the inlet chamber. This way, the movable closing member is pushed away from the first inlet duct and the inlet chamber when the linear actuator is transitioning from the contracted state to the expanded state. Correspondingly, the movable closing member is pulled towards the first inlet duct and the inlet chamber when the linear actuator is transitioning from the expanded state to the contracted state.

According to aspects, a longitudinal axis of the first inlet duct is parallel to a rotating axis of the impeller. In that case, the longitudinal axis of the first inlet duct may be arranged at distance from the rotating axis of the impeller. Furthermore, an edge of the first inlet duct is arranged at distance from an outer radial edge of the impeller.

According to aspects, a linear axis of the linear actuator is parallel to the rotating axis of the impeller. In that case, the linear axis of the linear actuator may be arranged at a distance from the rotating axis of the impeller.

According to aspects, the inlet chamber encloses a first volume and the impeller housing encloses a second volume, wherein the first volume is arranged separate from the second volume. This can facilitate arranging the ventilation system in a volume enclosed by a dishwasher door.

According to aspects, the connection member comprises a rigid arm connecting the movable closing member and the linear actuator. This provides a simple mechanism for setting the movable closing member in the positions for opening and closing the inlet duct, respectively. According to further aspects, the movable closing member is movable in a linear direction. According to aspects, the linear actuator is arranged outside the inlet chamber. This way, the linear actuator avoids contact with the fluid inside the inlet chamber.

According to aspects, the ventilation system further comprises a second inlet duct arranged in association with the impeller housing so that, when operating the impeller, a flow of a second fluid is generated through the second inlet duct into the impeller housing, and is expelled through the outlet duct 121. The second inlet duct is preferably in fluid communication with an environment outside the washing chamber. When the movable closing member is positioned so at to open the first inlet duct, the second fluid is mixed with the first fluid in the impeller housing, and the mixture is expelled through the outlet duct. The mixing of the first fluid and second fluid can help condense steam in the first fluid from the washing chamber, especially if the second fluid comprises dryer air compared to the first liquid. When the movable closing member is positioned so at to close the first inlet duct, only the second fluid flows through the ventilation system when operating the impeller. The flow of a second fluid can be used to cool electric components in connection to the outlet duct, which can be desired to do during all steps in the wash cycle of the dishwasher. For example, heat sinks connected to electronic circuit boards can be in thermal contact with an air channel connected to the outlet duct.

According to aspects, the second inlet duct is arranged coaxially with the impeller. This way, the impeller can provide a high flow rate.

There is also disclosed herein a dishwasher comprising the ventilation system according to the discussions above. The dishwasher may comprise a washing chamber and a door for opening and closing the washing chamber. In that case, the first inlet duct may be arranged at an inward side of the door facing into the washing chamber. Furthermore, the first inlet duct may be fluidly connected to an inside of the washing chamber, and the outlet duct may be fluidly connected to an outside of the washing chamber. This disclosed dishwasher is thus provided with a ventilation system with improved means of closing a fluid connection between an inside of the washing chamber and an inside of the ventilation system. The movable closing member can be positioned so as to close the first inlet duct when during wash steps of a wash cycle and be positioned so at to open the first inlet duct during drying steps of the wash cycle.

According to aspects, the dishwasher comprises the ventilation system with the second inlet duct according to the discussions above. In that case, the second inlet duct may be fluidly connected to a volume enclosed by the door, and the outlet duct may be fluidly connected to an outside of volume enclosed by the door and of the washing chamber via a channel. This way, the second fluid typically comprises dryer air compared to the first fluid, which improves condensation of the first fluid when the movable closing member is positioned so as to close the first inlet duct. The second fluid may also be used for cooling electronic components arranged in the door the movable closing member is positioned so at to open the first inlet duct. In that case it is also advantageous that the second fluid comprises dryer air compared to the first fluid.

According to aspects, the movable closing member is linearly movable in a direction perpendicular to the inward side of the door of the dishwasher.

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, apparatus, component, means, step, etc." are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc. , unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated. Further features of, and advantages with, the present disclosure will become apparent when studying the appended claims and the following description. The skilled person realizes that different features of the present disclosure may be combined to create embodiments other than those described in the following, without departing from the scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

With reference to the appended drawings, below follows a more detailed description of embodiments of the present disclosure cited as examples. In the drawings:

Figure 1 shows an exploded view of a ventilation system,

Figure 2 shows parts of the ventilation system of Figure 1 ,

Figures 3-5 show different views of the ventilation system of Figure 1 ,

Figure 6 shows a view from a cut A-A in Figure 5,

Figure 7 is a schematic illustration of a ventilation system,

Figure 8 is a schematic illustration of a ventilation system arranged in a door of a dishwasher, and

Figures 9A and 9B show the ventilation system of Figure 1 arranged in a part of dishwasher door.

DETAILED DESCRIPTION The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which certain aspects of the present disclosure are shown. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments and aspects set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Like numbers refer to like elements throughout the description.

It is to be understood that the present disclosure is not limited to the embodiments described herein and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the appended claims.

With reference to Figures 7 and 8, there is disclosed herein a ventilation system 100 for a dishwasher 840. Although the ventilation system herein is described mainly with respect to a dishwasher, the ventilation system is not restricted to this particular type of household appliance, and may also be used in other types of household appliances.

There is also disclosed herein a dishwasher 840 comprising the ventilation system 100. In particular, the dishwasher 840 may comprise a washing chamber 841 and a door 800 for opening and closing the washing chamber. The washing chamber 841 is an enclosure in which dishes can be stored and comprises an open face providing access to the washing chamber. The door 800 is configured to close and open the open face. The ventilation system may in particular be arranged in the door 800, i.e., in a gap between an inward side 810 and an outward side 820 of the door, where the inward side faces an inside of the washing chamber and the outward side faces away from the washing chamber towards an outside of the washing chamber. The ventilation system can be arranged elsewhere in the dishwasher as well, such as in a gap between a wall of the washing chamber and an outer housing of the dishwasher.

The disclosed dishwasher 840 may further comprise one or more baskets distributed across respective layer, in which the dishes can be arranged. These baskets can be moved into and out of a washing chamber through the opened door. The baskets can be comprise a mesh, i.e., provided with openings, so that the dishes can be sprayed with a liquid such as wash water.

The dishwasher 840 may be connected to a pressurized liquid system via a chamber intake and may comprise a chamber outlet for emptying the washing chamber of liquid. During the wash steps in the wash cycle, the liquid may be circulated in the washing chamber 841 in a closed circulation system. Such circulation system may comprise a fluid basin formed by a lower container part of the washing chamber for collecting liquid for recirculation. The circulation system may further comprise a circulation pump arranged to circulate the liquid under pressure during the wash steps in the wash cycle. The circulation pump may be controlled control unit for the various process steps of the dishwasher. The circulation pump is normally arranged to circulate water such that spraying means inside the washing chamber sprays the dishes with the liquid.

Figure 7 shows a schematic illustration of an example of the disclosed ventilation system 100. Figures 1-6 shown different views of an example ventilation system. In particular, Figure 1 shows an exploded view of the ventilation system, Figure 2 shows parts of the ventilation system, Figures 3-5 show different views of the ventilation system of Figure 1 , and Figure 6 shows a view from a cut A-A in Figure 5.

The ventilation system 100 comprises: an impeller 110 configured to, when in operation, feed a flow of fluid; an impeller housing 120; an inlet chamber 130 fluidly connected to the impeller housing 120; a first inlet duct 131 arranged in association with the inlet chamber 130 so that, when operating the impeller 110, a flow of a first fluid is generated through the first inlet duct into the inlet chamber and further into the impeller housing 120; an outlet duct 121 arranged in association with the impeller housing 120 so that, when operating the impeller 110, the first fluid in the impeller housing is expelled; a movable closing member 140 for closing the first inlet duct 131 ; and actuating means 150 configured to move the movable closing member 140.

The ventilation system provides a controlled flow of fluid, such as the evacuation of steam from the inside of washing chamber to an outside environment. The impeller is a rotor configured to increase the pressure and flow of a fluid, and thereby providing the controlled flow of steam during operation. The impeller is housed in the impeller housing. Herein, a fluid can be gas and/or a liquid, and in particular steam inside a washing chamber. The flow of the fluid is the motion of the fluid.

The inlet chamber is an enclosed cavity and is preferably separate from the impeller housing. In other words, preferably the inlet chamber 130 encloses a first volume and the impeller housing 120 encloses a second volume, where the first volume is arranged separate from the second volume. This can facilitate arranging the ventilation system in a volume enclosed by a dishwasher door. The inlet chamber is, as mentioned, fluidly connected to the impeller housing. In other words, when operating the impeller the flow of fluid is sucked into the inlet chamber via the first inlet duct, and is further sucked into the impeller housing, and is thereafter expelled from the impeller housing via the outlet duct. A duct is a passage into a chamber or housing through which the flow of fluid can pass. The duct can be a tube with a length in an extension direction of the tube. A duct can, according to aspects, be a hole, or aperture. The duct comprises a longitudinal axis. If the duct is a tube, the longitudinal axis is in the extension direction of the tube. If the duct is an aperture, the longitudinal axis is in a normal direction to the aperture. When a duct is arranged in association with a chamber, a flow of fluid can enter into the chamber via the duct from outside that chamber.

The disclosed actuating means comprise a linear actuator 151 associated with a contracted state and an expanded state. A linear actuator is configured to provide motion in a straight line, i.e., along a linear axis. The actuating means further comprises a connection member 152 connecting the movable closing member and the linear actuator. The connection member 152 may, e.g., comprise a rigid arm connecting the movable closing member 140 and the linear actuator 151 . In that case, when the linear actuator transitions from the contracted state to the expanded state, the rigid arm is pushed away from the linear actuator. When the linear actuator transitions from the expanded state to the contracted state, the rigid arm is pulled towards the linear actuator. The rigid arm causes the movable closing member to move relative to the linear actuator in a similar way. The movable closing member 140 may be movable in a linear direction. Furthermore, the movable closing member and the connection member may move linearly along the linear axis of the linear actuator when the linear actuator transitions between the expanded state and the contracted state.

The movable closing member 140 is positioned so as to close the first inlet duct 131 when the linear actuator is in the contracted state, where the movable closing member 140 is positioned so at to open the first inlet duct 131 when the linear actuator is in the expanded state.

As mentioned, water may enter the ventilation system through the first inlet duct during the wash steps in the wash cycle of the dishwasher, which is undesired. The movable closing member 140 is configured to obstruct the first inlet duct when the linear actuator is in the contracted state. Preferably, the movable closing member 140 completely closes the first inlet duct 131 so that no fluid can pass into the duct. However, the first inlet duct is unlikely to be perfectly sealed off, and some fluid may leak through. The inside of the washing chamber, in particular, may be under higher pressure compared to the outside environment during the wash steps. Some steam or wash water may therefore leak between movable closing member and the first inlet duct into the inlet chamber, which is undesired. When the movable closing member is positioned so at to open the first inlet duct, the flow of fluid can pass into the inlet chamber relatively freely, i.e., less obstructed, compared to the movable closing member 140 is positioned so as to close the first inlet duct 131.

As mentioned, the movable closing member 140 is positioned so as to close the first inlet duct 131 when the linear actuator is in the contracted state. This is advantageous since some linear actuators require constant power to be in the expanded state and require no power to be in the contracted state. It is therefore desired that the linear actuator spend less time in the expanded state than in the contracted state during operation of the dishwasher. In some dishwashers, less time is spent in drying steps of the wash cycle compared to wash steps of the wash cycle. It can therefore be advantageous that the movable closing member is positioned so as to close the first inlet duct, i.e. , configured to obstruct the first inlet duct, when the linear actuator is in the contracted state as this can be more energy efficient

In addition, some linear actuators are designed to provide a greater pulling force in the contracted state compared to a corresponding pushing force in the expanded state. In other words, a linear actuator can pull a closing member towards itself with greater force than it can push the closing member away from itself. The disclosed ventilation system can therefore provide better sealing between the first inlet duct and the movable closing member 140 when the movable closing member is positioned so as to close the first inlet duct 131. In particular, the linear actuator 151 may be arranged to, when in the contracted state, press the movable closing member 140 against a surface around the first inlet duct 131 . For example, the movable closing member may be a disc with a larger diameter than a circular aperture of the first inlet duct. In that case, the disc may press against a circumferential surface around that aperture when positioned to close the first inlet duct. In general, the movable closing member preferably has a shape corresponding to the shape of the first inlet duct. The movable closing member 140 may, e.g., be planar. Alternatively, the movable closing member 140 may have a conical shape. As mentioned, the movable closing member and the connection member may move linearly along the linear axis of the linear actuator when the linear actuator transitions between the expanded state and the contracted state. This way, the linear actuator can provide a greater force when pressing the movable closing member against the surface around the first inlet duct compared to if the liner axis of the linear actuator is not arranged coaxially with the movement of the movable closing member and the connection member.

As can be seen in Figure 7, the movable closing member 140 may be movable at least partially outside the inlet chamber 130. This way, the movable closing member is pushed away from the first inlet duct and the inlet chamber when the linear actuator is transitioning from the contracted state to the expanded state. Correspondingly, the movable closing member is pulled towards the first inlet duct and the inlet chamber when the linear actuator is transitioning from the expanded state to the contracted state.

The ventilation system 100 may further comprise sealing means operating between the movable closing member 140 and the first inlet duct 131 , where the sealing means are solidly connected to the movable closing member and/or the first inlet duct. This further improves the sealing between the movable closing member and the first inlet duct when positioned so as to close the first inlet duct. The sealing means may, e.g., comprise a gasket. For example, it the first inlet duct is circular, the gasket may be arranged circumferentially on a surface around the first inlet duct. Preferably, the gasket is compressed between the movable closing member 140 and the surface around the first inlet duct 131 when the linear actuator is in the contracted state.

The linear actuator 151 is preferably a thermal actuator. A thermal actuator, sometimes called a thermostatic element, is configured to convert heat energy to mechanical energy through thermal expansion of a material. In particular, the linear actuator 151 may comprise a material capable of expanding when heated. For example, the material may to expand during a phase transition from solid to liquid. The material may, e.g., comprise wax, which is an organic compound comprising long aliphatic alkyl chains. A wax thermal actuator is sometimes called a thermal wax element or a wax element. The linear actuator can thus be set into the expanded state from the contracted state by providing heat to the linear actuator. The heat input may be controlled by the environment around the linear actuator. However, to provide more control of the actuation, the heat input is preferably provided by an electrical arrangement, such as a coil, arranged in connection to the liner actuator, where the electrical arrangement heats up as electric current flows through it.

The impeller 110 rotates around a rotation axis and is normally rotated by an impeller motor 111 which comprises a shaft connected to the impeller at the rotation axis. The impeller motor is preferably arranged outside the impeller housing to avoid contact with the fluid inside the impeller hosing. Similarly, the linear actuator 151 is preferably be arranged outside the inlet chamber 130 to avoid contact with the fluid inside the inlet chamber.

According to aspects, a longitudinal axis of the first inlet duct 131 is parallel to a rotating axis of the impeller 110. In that case, the longitudinal axis of the first inlet duct 131 may be arranged at distance from the rotating axis of the impeller 110. This distance is preferably larger than a radius of the impeller and more preferably larger than a diameter of the impeller. Furthermore, an edge of the first inlet duct 131 may be arranged at distance from an outer radial edge of the impeller 110. The radial edge of the impeller is an edge at an outer circumference of the impeller, i.e., on a perimeter of the impeller. The edge of the first inlet duct can be on the perimeter of the duct, such as a perimeter of an aperture constituting the duct. Arranging the inlet duct away from impeller according to the discussions above can facilitate arranging the ventilation system in a volume enclosed by a dishwasher door.

According to aspects, a linear axis of the linear actuator 151 is parallel to the rotating axis of the impeller 110. The linear axis of the linear actuator is the straight line the linear actuator provides motion in. In addition, the linear actuator is preferably arranged on an opposite side of the ventilation system compared to the impeller motor 111 , as is shown in, e.g., Figures 6 and 7. In other words, a shaft of the impeller motor extends from the impeller motor towards the impeller in a fist direction, and the connection member of the actuation means extend from the linear actuator towards the movable closing member in a second direction, where the second direction is opposite to the first direction. In addition to being parallel as discussed above, the linear axis of the linear actuator is preferably arranged at a distance from the rotating axis of the impeller 110. This distance is preferably larger than a radius of the impeller and more preferably larger than a diameter of the impeller.

The ventilation system 100 may further comprise a second inlet duct 122 arranged in association with the impeller housing 120 so that, when operating the impeller 110, a flow of a second fluid is generated through the second inlet duct into the impeller housing 120, and is expelled through the outlet duct 121. The second inlet duct 122 can be arranged in fluid communication with an environment outside the washing chamber 841. When the movable closing member 140 is positioned so at to open the first inlet duct 131 , the second fluid is mixed with the first fluid in the impeller housing, and the mixture is expelled through the outlet duct 121 . The mixing of the first fluid and second the fluid can help condense steam in the first fluid from the washing chamber, especially if the second fluid comprises dryer air than the first liquid, i.e. , liquid with less water content.

When the movable closing member 140 is positioned so at to close the first inlet duct 131 , only the second fluid flows through the ventilation system when operating the impeller. The flow of the second fluid can be used to cool electric components, which can be desired to do during all steps in the wash cycle of the dishwasher. For example, heat sinks connected to electronic circuit boards can be in thermal contact with an air channel connected to the outlet duct.

The second inlet duct 122 may be arranged coaxially with the impeller 110. This way, the impeller can provide a high flow rate.

Referring to Figures 7-8, the ventilation system may comprise an impeller plate 103 arranged in the impeller housing 120 and arranged to direct the flow of fluid from the inlet chamber 130 into a center of the impeller 110. This way, the impeller can provide a high flow rate.

Referring again to Figures 1-6. The example ventilation system in these figures comprises a disc-shaped movable member 140 movable at least partially outside the inlet chamber 130. The disc is pressed against a surface around the first inlet duct 131 when the linear actuator 151 is in the contracted state. The impeller housing is a separate enclosure from the inlet chamber, i.e., the inlet chamber 130 encloses a first volume and the impeller housing 120 encloses a second volume, where the first volume is arranged separate from the second volume. Furthermore, the longitudinal axis of the first inlet duct 131 is parallel to a rotating axis of the impeller 110, and the longitudinal axis of the first inlet duct is arranged at distance from the rotating axis of the impeller. In particular, an edge of the first inlet duct 131 is arranged at distance from an outer radial edge of the impeller 110. Furthermore, the linear actuator 151 is parallel to the rotating axis of the impeller 110, and the linear axis of the linear actuator is arranged at a distance from the rotating axis of the impeller 110.

In the example ventilation system 100 in Figures 1-6, the linear actuator 151 is arranged outside the inlet chamber 130 and the impeller motor 111 is arranged outside the impeller housing. The connection member 152 comprises a rigid arm connecting the movable closing member 140 and the linear actuator 151 and the movable closing member 140 is movable in a linear direction. In addition, the movable closing member and the connection member move linearly along the linear axis of the linear actuator when the linear actuator transitions between the expanded state and the contracted state. The example ventilation system also comprises the second inlet duct 122 arranged coaxially with the impeller 110.

In the example Figures 1-6, the ventilation system comprises a first housing member 101 and a second housing member 102, which may, e.g., comprise plastic. The first housing member comprises a first portion of the impeller housing, a first portion of the inlet chamber, and a first portion of the outlet duct. The second housing member comprises a second portion of the impeller housing, a second portion of the inlet chamber, and a second portion of the outlet duct. When the first and the second housing members are assembled, the first and the second portions of the impeller housing form the impeller housing, the first and the second portions of the inlet chamber form the inlet chamber, and the first and the second portions of the outlet duct form the outlet duct. Figure 2, in particular, shows the second housing member in isolation from the first housing member. This figures also shows, i.a., the impeller 110 and the outlet duct 131.

Furthermore, in the example of Figures 1-6, the ventilation system comprises an impeller plate 103. This impeller plate is arranged between the first and the second portions of the impeller housing and is arranged to direct the flow of fluid between the impeller housing and the inlet chamber. In particular, the impeller plate 103 is arranged to direct the flow of fluid from the inlet chamber into a center of the impeller.

As is shown in Figure 1 , the example ventilation system further comprises a cover 141. This cover can be used as an attachment point which mounts the ventilation system to the door of a dishwasher.

Referring back to the dishwasher disclosed herein, specifically the dishwasher 840 comprising a washing chamber 841 and a door 800, as is illustrated in, e.g., Figure 8. In such dishwasher, the first inlet duct 131 may be arranged at an inward side 810 of the door facing into the washing chamber, where the first inlet duct is fluidly connected to an inside of the washing chamber, and where the outlet duct 121 is fluidly connected to an outside of the washing chamber. The door is normally a rectangular surface with two faces and is associated with a thickness. The inward side 810 is the side facing the washing chamber. The opposing side is an outward side 820. The thickness of the door, i.e., the distance between the inward side and the outward side is normally a few centimeters. The inward side and the outward sides encapsulates a volume inside the door, which can accommodate the ventilation system 100. Furthermore, the movable closing member 140 is preferably linearly movable in a direction perpendicular to the inward side 810 of the door of the dishwasher.

According to aspects, the dishwasher 840 comprises the ventilation system 100 with the second inlet duct 122 according to the discussions above. In that case, the second inlet duct 122 may be fluidly connected to a volume enclosed by the door 800, and the outlet duct 121 may be fluidly connected to an outside of the volume enclosed by the door and of the washing chamber 841 via a channel 830. This way, the second fluid comprises dryer air compared to the first fluid, which improves condensation of the first fluid. The second fluid may also be used for cooling electronic components arranged in the door. In the example of Figure 8, the channel 830 is fluidly connected to an outward duct 821 arranged on the outward side 820 of the door 800. Furthermore, the inlet duct is fluidly connected to an inward duct 811 of the door.

Figures 9A and 9B show an example of a door part of a door 800 with the example ventilation system 100 of Figures 1-6. Figures 9A shows the inward side 810 of the door part and figure 9B shows the other side of the same door part. This other side faces into the volume enclosed by the door. This door part may e.g. comprise metal. Said door part forms the door when assembled with a corresponding part comprising the outward side 820. Figure 9A shows the inward duct 811. The first inlet duct 131 is fluidly connected to the inside of the washing chamber when the door is arranged closing the washing chamber. The outlet duct 121 is fluidly connected to an outside of the washing chamber via an air channel 830, which is connected to an outward duct 821 arranged between the inward side 810 and the outward side 820.