FIELD OF THE INVENTION

The present invention relates to a device and a method for using such device, where the device preferably being a pump, for transport of fluid and biomass, preferably fish, comprising a rotating part and a housing enclosing the rotating part and a space between the rotating part and the housing forming a closed fluid volume with an inlet and an outlet for fluid and biomasses and a method for transport of fluid and biomasses by means of the device.

BACKGROUND OF THE INVENTION

Transport of fish is done between many different fish handling operations, being between a fish farming net cage and a fish carrier, from a waiting net cage or a well-boat to slaughter house and so on. There are strict requirements to fish welfare of living fish in both farming, fishing, towing, transport and storage. Equipment, including fish pumps, shall be so designed as to avoid injury and thus ensure good fish health and low death-rate. This also contributes to increased quality of the slaughtered fish. The aquaculture and fishing industry is a financially strong and willing industry. Therefore, there is a huge amount of research and development in those product used by the industry. The biomass in the industry is steadily increasing and has increased significantly since farming started in the 70’s. In the past, it has roughly been at the release of smolt and at slaughter, that biomass has had to be pumped.

Salmon lice have gradually become a problem of great significance and a large part of the lice treatment is currently taking place on-board well-boats/barges, where the pumping of fish for treatment has dramatically increased. This means that the fish is being pumped much more often than before. Based on the desire for minimal injury, both in terms of fish welfare and the economy and quality of the end- product, great effort has been made in this area. This has been an important contributor to a significant innovation effort carried out by the suppliers in order to reach the best possible solutions.

Various methods for pumping of biomass exist today. With increasing demands for efficacy, large well-boats, and larger load-lifting height - not to mention an increased focus on fish welfare - the fishing industry is compelled to continuously discover better and more humane solutions when it comes to handling of fish. This will aid in maintaining the best possible fish meat quality while at the same time protect living fish in the best possible way. Vacuum pumping is a pumping system which provides satisfactory load-lifting height. A pump will suck the vacuum in a tank where the inlet has been submerged into a net cage, for example. The vacuum which occurs will suck water and fish into the tank. When the tank is full, the pump stops, and a check valve in the tank inlet will close, and the pump will subsequently start to push water into the tank inlet where water and fish in the tank will be further pushed out of the tank and up to a factory, for example. Key problems connected to this method include fish and water being pumped into an empty tank, thereby creating the possibility of fish damage. Between the rotations, the pumping process will halt in order to allow the withdrawal of fish positioned just in front the net cage inlet. This will - in concert with the rotation time itself - increase the time period where fish is not being pumped. The check valves possess a significant damage potential in which the fish skin will grind against these upon closing or the fish will be clamped in the valves.

Another system is a pump which sucks fish and water into the pump where and the water - together with the fish - pass through the pump’s impeller. The impeller is shaped to ensure that the fish is treated in the best and most careful way possible, which means that the rotation speed is significantly throttled. This scenario too presents a risk where the fish will be clamped, chiefly in connection with the rotating impeller. Furthermore, there is a pumping system run by an ejector system. The water being pumped is also used as liquid fuel, which means that water is being sucked up by an external pump, which pumps this water back into the system through one or several inducer systems, which enables the utilization of the ejector effect in order to pump the fish. The challenges revolve around the pump sucking from the same closed system as the ejector, which will to a certain extent cause the suction to neutralize the ejector effect. The ejector pumps therefore provide a limited load-lifting height of no more than 3 meters. These ejector systems require a dedicated centrifugal pump or displacement pump. NO 337898 presents a device for pumping of particles in liquid, especially living fish in water, where a chamber draws liquid and particles from a liquid volume through a closed channel since the chamber is connected to an ejector suction side and a pump for the creation of a vacuum in the chamber. At the same time, gas added from a compressor and into a liquid column in a chamber will contribute to further liquid stream acceleration through the chamber. An ejector is run by a liquid stream out of a pump or by gas from a compressor. A closed channel is connected to a check valve, which prevents liquid and particles from returning to liquid volume. Liquid and particles are led out of the chamber and through an ejector, and from there into a closed channel and to the reception device..

W01980/00471 describes a pump for pumping of large, solid particles by means of a rotary pump with an impeller comprising a plain disc together with a number of other discs spaced close in pairs at a distance from the impellers flat disc forming the rotor of the pump. Because of the friction of the fluid on the surface of the plates during rotation of the rotor a centrifugal force is developed, propelling the fluid outward toward the periphery of the plates.

SU901635 describes a fish pump for pumping fish with water, which among other things consists a rotating part comprising blades with a curved surface, a housing enclosing the rotating part, where between the house and the rotating part is formed a closed volume of liquid with an inlet and an outlet. The pump also comprises a channel 11 arranged in a space between the house and the rotating part for transport of fish mixed with water, where contact between fish and blades is avoided by use of a protecting wall with openings.

NO 20170558 shows a fish pump consisting of a central passage, a mantle or a rotating part with blades comprising a central cone-shaped opening, which is in fluid communication with the central passage and a casing, where fish are protected from damage that can be inflicted on fish by rotating parts by using a wall with openings. The rotating part with the blades extends from the pump inlet to the pump outlet and creates a flow of water and water pressure, but is arranged externally in the pump, i.e. the channel for transporting fish is arranged inside the rotating part.

There are various challenges associated to pumping fish that should be transported through the system as quickly but gently as possible. The challenges are usually too high pumping pressure, sharp edges and pipe transitions, areas where the fish are not enclosed by water and so on. A simple, compact and cost-efficient design is preferred. There is therefore a need for a method and a pump that can overcome many of the challenges we face today without compromising on the fish welfare.

SUMMARY OF THE INVENTION

In the following, and throughout the specification, the following terms means:

The term « device» is used to describe the device transporting fluid and/or biomasses from one location to another. The device is preferably a pump with belonging pipe system and an energy source.

The term «moving part» is used to describe the pump impeller or rotor, which is the rotating part of the pump and provides the suction power of the pump.

The term «fluid» is used to describe the transport medium of the device or the pump medium, which preferably is in liquid form, optionally including air bubbles and then preferably water or seawater.

The formulation «biomasses» is used for living organisms or goods which may be present in the transport medium of fluid of the device. The biomasses preferably comprise fish, live or death, but is not limited to comprise only fish, it may also comprise other relevant element such as shrimps, fry or smolt or other products to be transported.

The term «housing» is used to describe what encapsulate the rotating part and provides a closed volume for fluid, such as a pump housing.

The term «channel» is used for the area through which fluid and biomass are driven through, for example, a pump. This may be an integral part of the housing, in whole or in part, where some parts may partially enter the closed system outside the housing and the channel is preferably a passage which runs outside the rotating part and where the desired pumping medium of biomass and fluid is conducted.

The term «upstream» is the area at the pump inlet for fluid and biomass.

The term «downstream» is the area at the pump outlet for fluid and biomass.

It is an object with the present invention to provide a device and a method for transport of biomass by means of the device. It is a further object to provide a device generating a substantial lifting height.

A further object is to provide a pump, scalable I relation to desired lifting height and size of the object(s) to be pumped.

Another object of the present invention is to provide a device which safeguards the fish welfare during the transporting process.

Yet another object of the invention is to provide a device of low complexity in terms of number of parts, production and connection.

The objects of the invention are achieved by a device and method for transporting fish by means of the device as described in the independent claims, wherein the embodiments, variants or alternatives can partially or further be achieved by the independent claims.

The present invention accordingly in this initial aspect concerns a device, preferably a pump for transport of fluids and biomass, preferably fish, which comprise a rotating part and a housing part which enclose the rotating part, and a space between the rotating part and the housing part forming a closed fluid volume with a with an inlet and an outlet for fluid and biomass. The space comprises a channel and the rotating part, which consists of a singular or double curved surface, comprising circular cross-section surfaces, where the circular cross-sections possess an increasing base diameter from the inlet of the pump by the pump’s upstream side to the outlet of the pump by the pump’s downstream side.

The rotating part is equipped with an internal or external rising grooves, fins or blades which are arranged in or on the surface of the rotating part and allocated along the rotational axis of the rotating part in the longitudinal direction.

The device is orientated with the rotational axis in a vertical, angular, or horizontal position.

The channel further comprises a wall with openings separating the channel and the rotating part, and as such is a hindrance for biomass coming into contact with the rotating part, but allow for fluid contact between the channel and the rotating part.

The wall with the openings, where the openings are represented for example by a grid mesh, a row of bars, longitudinal rods with transverse rods for suspension of longitudinal rods, etc. The distance between the rotating part and the wall with the openings and/or the inner walls of the housing part is bigger than or equal to the openings in the wall.

The inlet is positioned on level with the rotating part’s circular cross-section surfaces with the smallest base diameter, the upstream side of the pump, and the outlet are on level with the rotating part’s circular cross-section surfaces with the largest base diameter, the upstream side of the pump.

The device’s supply of fluid and biomass comprises the channel which starts at the inlet, by the pump’s upstream side, and ends by the outlet, by the pump’s downstream side, winding like helix/vortex in an axial direction of the housing part, where the water is pulled in towards and elevated through the rotating part and is thrown by a centrifugal force back in the channel, pulling the water from the upstream to the downstream device.

The channel comprises a surface which, together with the housing part, form a closed fluid volume, where the surface of the channel comprises a cross-section which preferably is circular, oval, or multi-angular shaped.

The channel supplies the rotating part of the device with water and leads fish from the inlet to the outlet.

The housing part surrounds the rotating part in a singularly curved cone- shaped surface or double curved surfaces in half-spherical shapes.

The rotating part is operated through a device for rotation, electrically or hydraulically operated, preferably by an electric motor.

The surface of the rotating part is smooth, or comprised by channels or blades or threads following the surface of the rotating part.

In another aspect, the present invention concerns a method for biomass transport by the device, following these steps:

- connecting the device’s inlet and outlet to pipes in order to lead fluid and biomasses from one location to a desired location

- placing in the smallest pipe leading from the inlet of the device in a

location containing fluids and biomasses, preferably sea water and fish

- placing in the smallest pipe leading from the outlet of the device to a desired location for transport - starting a device for rotation, electrical or hydraulically, preferably an electric motor connected to the rotating part of the device for rotation of this part.

The invention comprises a pump or rotor and a pump housing shaped to fit with a movable rotor of any desirable shape, a conically shaped rotor or impeller.

The rotating part may run on an electric motor, however, a hydraulically system rotating a drive shaft connected against the rotating part may also be applicable. When the conically or double-curved half-sphere-shaped rotor rotates, the velocity of the water at the lower part of the rotor (the narrow end of the rotor) will possess a significantly slower velocity than the water in the upper part of the rotor (the wide end of the rotor), which creates a vacuum at the lower part of the rotor, and a

corresponding higher pressure in the upper part. This will suck the water into the fish pipe/fish channel in the lower part, and the water is elevated up through the rotor.

The water is thrown out by the centrifugal force in the upper part of the rotor. At the same time, the effect of a boundary-layer will cause the water which is pulled up and around through the outer side of the rotor to also pull with it water and particles up through the channel surrounding the pump housing. In concert with the momentum, velocity, and direction of the water, this will lead to the water being pumped out through the outlet of the channel in the upper part of the pump housing. The channel will stand at a right angle on the rotational axis of the rotor by the upper part of the rotor, which entails a large contact surface pulling the water in the direction of the outlet.

Before starting up, the pump must be primed with water, which can be solved by dedicated water nozzles, for example. It can also be solved by connecting an external pump, or connecting the pump by the invention to the water system where this is mounted. A closing valve is necessary by the inlet side, as well as a valve at the highest point of the pump in order to release air during priming. Another solution for priming is to place a closing valve on the outlet, and for example connect a pump suitable for suction of air and water to the highest point on the fish pump, and subsequently sucking the air out of the fish pump. This way, sea water will fill the pump housing and it will not be necessary to use a closing valve in the inlet. When the air is out of the fish pump, the fish pump will start, and the pump responsible for sucking out the air will stop. When the pumping is concluded, the closing valve on the outlet will close as the water stops flowing out. As a result, water and fish will be released back into through the inlet.

The channel system for fluid and biomasses has two functions; to ensure that the desired pump medium moves through the channel system from an inlet point to an outlet point, while at the same time ensuring the supply of necessary fluid to the rotor and that the rotor can throw the fluid back in the channel in order to arrange the lifting effect through the pump from the inlet of the pump to the outlet of the pump. Preferably, only the fluid should be allowed in to the rotor itself. In order to allow this, there have been, in the interface of the channel against the rotor, between the pump’s rotor and the channel leading water and biomass in through the pump, erected obstacles in the pump housing which follow the opening of the pump housing wall created by the channel which winds like a helix/slipstream (vortex) around the pump housing. This obstacle may be a grid mesh, an anti-scatter grid, a wall containing openings, but preferably longitudinal rods or similar. The latter is preferable, as it is conducive to have transverse rods which will increase the water resistance to the lowest degree possible, since they are positioned transversally relative to the direction of the water, which consequently will limit the boundary layer effect in order to maintain a largest possible load-lifting height. The transverse rods comprise rounded edges to achieve a best possible water flow past them, where the rods preferably have a circular cross-section. Transverse rods are necessary for suspension of the longitudinal rods. The distance between one or several rods and the opening in the pump housing maintains an obstacle for undesired biomasses or other fixed elements of a certain size. The distances must necessarily be equal or less than the distance between the rotating part and the housing to avoid that elements are wedged between the rotating part and the housing, causing a shutdown of the rotating part and consequently the pump. Thus, there is no contact between the rotating part and the biomasses to be transported by the pump, and rotational velocity consequently does not become a problem, and the fish welfare is safeguarded well.

The pump will also be able to pump only water since it possesses a large capacity in terms of volume and load-lifting height. The pump according to the invention is compact and complies with the law of chemical affinity, enabling it to become easily scalable through a proportional increase through upscaling of the pump’s parts, making it suitable also to adapt size and load-lifting height to the needs and wishes of the customer. Trials show that a doubling of size approximately results in a quadruple increase of load-lifting height with the same RPM.

The design and the idea is based on the tornado weather system, where the conical shape and the rotation creating suction/lift is equal, and where the tornado has loose debris in the tornado, such as biomasses being pumped by the pump according to the invention, in the tornado’s pump’s outer edge, respectively.

DESCRIPTION OF FIGURES

Non-limited embodiments of the invention shall in the following be described in further detail in reference to the enclosed figures, in which:

Figure 1 shows a fish pump of prior art.

Figure 2 schematically and partly in a sectional view shows a perspective outline of the pump according to an embodiment of the invention, with a 90 degree sectional view through the pump housing in an embodiment of the invention.

Figure 3 schematically shows a sectional view through the pump as shown in figure 2, viewed along the rotational axis of the pump.

Figure 4 schematically and perspectively schematically shows the pump without the pump housing, and how the channel for the fluid and fish winds upwards in the pump housing like a conical helix/vortex.

Figure 5 schematically and in perspective shows the pump’s channel for fluid and fish.

Figure 6 schematically shows a principal draft of a sectional view in a lying position in an incline in the center of the channel which winds around the pump.

Figure 7 schematically shows a cross-section of an alignment of the pump through the rotational axis of the rotor, where the direction of movement of the rotor and the flow direction of the fluid are also shown.

Figure 8 schematically and in perspective shows a cross-section of a different embodiment of the pump and rotational axis without a moving part. Figure 9 schematically and in perspective shows a cross-section of another embodiment of the pump 10, the rotating part shown with a smooth surface.

Figure 10 schematically and in perspective shows a cross-section of another embodiment of the pump 10, the rotating part 20 is shown with a surface comprising blades in a helix/vortex-shaped trajectory.

Figure 11 schematically and in perspective shows the same cross-section of the pump as in figure 10, where the rotor is equipped with straight blades.

Figure 12 schematically and in perspective shows a cross-section of the pump as in the two preceding figures 10 and 11 , where the blades are more coarse and possess a larger surface area.

DETAILED DESCRIPTION OF EMBODIMENT AS SHOWN IN THE FIGURES

The following description of exemplified embodiments of the present invention refer to the two enclosed drawings. The same reference numbers are used in the various embodiments for the same or similar elements. The following detailed description is not meant to limit the invention or the scope of protection, as the scope of protection is defined by the interpretation of the skilled person of the scope of the enclosed patent claims.

Reference to the description to «one embodiment» or «an embodiment» means that a specific feature, structure, or characterizing part described in connection with an embodiment is comprised in at least one embodiment of the application object. Accordingly, the application of the expression“in one

embodiment” or“in an embodiment” in various places in the description not necessarily refer to one and the same embodiment form.

Figure 1 shows prior art of a rotational pump as referred to in

W01980/00471 , in which a pump A for pumping of large, fixed objects is described. The pump A comprises a rotational pump with a flat impeller B arranged in a mainly cylindrical chamber F on a housing E with an inlet C which is coaxial in relation to the impeller B in the housing E. An outlet D (not shown) from the periphery of the chamber F with a rotor arranged to provide a mainly uninterrupted passage between the inlet C past the rotor blades to the outlet D of the pump A. The impeller B comprises disc pairs G, H, and K, L, where the discs in the pairs are tightly arranged to provide an increased fluid pressure, and where the disc pairs G, H and K, L are placed at a distance from each other to provide passage for the fixed objects. The articles are pumped in a fluid medium, for example water, through the pump A, and is kept in suspension in the fluid medium during transport from the inlet C to the outlet D of the system.

Figure 2 shows a perspective of one preferred embodiment of the invention by a pump 10 with a 90 degree sectional view through a housing 30. The pump 10 comprises a rotating, movable part 20, a housing 30 which surrounds the rotating part 20, a channel 40 winding around and up along the housing 30 like a conical helix/vortex, where the channel 40 has an inlet 41 , placed upstream from the pump, (not shown in figure 2) and an outlet 42, placed downstream from the pump. Upon pumping, fluid and fish are pulled/pumped into the housing 30 by an inlet 41 , placed upstream from the pump 10, and which is connected to a pipe or a hose submerged in a fluid filled area containing biomass, preferably fish. Fluid and biomass are pulled from the upstream side by the pump 10 and up through the channel 40

simultaneously while parts of the fluid are pulled in towards the rotating part 20, the biomass, as well as a significant amount of fluid, remain in the channel 40, which is separated from the housing 30 and the rotating part 20 with an obstacle 31 or a wall (not shown) with openings 31 allowing the fluid passage to come in contact with the rotating part 20. Fluid is sucked into the lower part of the rotating part 20 (the downstream side), the velocity is increased gradually as the fluid proceeds upwards along the rotating part’s 20 increased diameter between the downstream side towards the upstream side. This fluid brings about fluid in the channel all the way through the boundary-layer effect. When this water reaches the rotating part’s 20 most extensive area by the upstream side, it has acquired full velocity and is thrown out by the centrifugal force. Fluid and biomass pass through the outlet 42, placed downstream from the pump 10, to a destination after its passage through the channel 40. The rotating part 20 is preferably cone-shaped, but it is not limited to this shape; it may also come in other shapes, such as spherical, egg-shaped et al.

Furthermore, the figure shows a movable part 20 with a smooth surface but it is not limited to this shape; it may also come in other shapes, such as blades 21 , channels, or threads, with various degrees of coarseness. The number of threads is at minimum one, but not limited to one. The degree of coarseness of the blades 21 , channels, or threads depends on the amount of water one desires to pull towards the rotating part 20. The housing 30 is in this embodiment cone-shaped like the rotating part 20. The housing 30 is not limited to this shape; it may also come in other shapes, such as spherical, egg-shaped et al. the shapes do not necessarily have to mirror the shape of the rotating part 20, meaning being independent of the shape of the rotating part 20. The figure shows a channel 40 with a spherical cross-section; the channel 40 is not limited to a spherical cross-section, it may also be multi-edged, square, oval et al. The channel 40 and the housing 30 are fluid connected to ensure fluid and fluid contact with the rotating part 20. To ensure that biomass of a certain size does not come into contact with the rotating part 20 has been safeguarded through the size of the openings in the wall (not shown) with openings 31 , possibly the distance between the obstacles 31 in the wall. The wall/obstacles 31 do not allow biomass over a certain size to come into contact with the rotating part 20; it does, however, allow fluid contact between the channel 40 and the rotating part 20.

The distance between the rotating part 20 and housing 30 is equal or larger than these openings in the wall/openings between obstacles 31 , so that the biomasses that would pass between channel 40 and the rotating part 20 do not wedge, but follow the fluid stream upwards along the rotating part 20 and are pushed out through the wall with openings closer to the outlet side (downstream side).

Figure 3 shows a cross-section through the pump 10 shown in figure 2. The arrows shown in channel 40 show the fluid’s and biomass’ range of movement through the pump 10; the fluid mainly follows the same range of movement, at the same time as parts of the fluid are also sucked in towards the rotating part 20.

Figure 4 shows the pump 10 without the housing 30, and how the channel 40 for fluid and fish is winding upwards the not shown housing 30 like a conical helix/vortex. Figure 4 shows the inlet 41 to the pump 10 by the pump’s 10 upstream side, by the rotating part’s 20 least extensive area and the outlet 42 of the pump 10 by the pump’s 10 downstream side, by the rotating part’s 20 most extensive area. Placement of the pump’s 10 inlet 41 and outlet 42, respectively, can also be placed on other levels by the rotating part 20. Figure 5 shows the pump’s 10 channel 40 for fluid and fish. The arrows illustrate the movement of the fluid and the fish in the channel 40 from the pump’s 40 inlet 41 to the pump’s 10 outlet 42. The channel 40 shows an open area illustrating the interface of the channel 40 against the pump housing 30. This interface shall comprise a wall 31 (not shown) with openings or obstacles 31 , where the

wall/obstacles 31 may come in the shape of a grid mesh, longitudinal round bars, bars et al. which hinder the biomass in coming in contact with the rotating part 20, but where the fluid is allowed to penetrate to the rotating part 20.

In an embodiment of the method, transport occurs by a pump 10 through a pipe being connected to the inlet 41 and outlet 42 of the pump 10 in order to lead biomass, preferably fish and fluid, preferably sea water or water to and from desired location. The pipe connected to the inlet 41 of the pump 10 is placed in a location containing fluid and biomass, preferably a fish cage or a containment tank for fluids and biomasses. The pipe is connected to the outlet 42 of the pump 10 and placed at a desired location for the transport. A device for rotation 60 (not shown), preferably an electric motor or a hydraulic system to rotate the pump’s 10 rotating part 20, which is connected to the pump’s 10 rotating part 20.

Figure 6 shows a principal draft of a cross-section in a lying position in a level perpendicular on the rotational axis to the pump’s 10 rotating part 20. The fish and the fluid’s trajectory through the pump 10 has the same tangential direction as the pump’s 10 rotating part 20. Where the channel 40 is in a position of intervention with the pump housing 30, an exchange of fluids between the channel 40 and the rotating part 20 shall occur, a fluid contact, while the biomasses shall follow the fluid through the channel 40, and not enter the pump housing 30 and thus not come in contact with the rotating part 20. This requires an opening in the pump housing 30, which follows the channel 40, but that in the opening are obstacles, which prevent biomass to pass from the channel 40. In the embodiment shown, this obstacle is shown as a grid mesh, but it is not limited to this mesh form; it can also come in the shape of longitudinal round bars, longitudinal and/or transverse bars and so forth. The obstacle 31 prevents the biomass to come in contact with the rotor and thus prevents any instances of injury or damage. Fluid and biomass enter the channel 40 due to the rotation of the rotating part 20, which pulls with it fluid and biomass in the channel 40. Fluid that comes into contact with the rotating part 20 sees increased velocity between the upstream side and the downstream side of the pump 10 due to an increased diameter on the rotating part 20 between the upstream side and the downstream side of the rotating part 20. The boundary-layer effect causes the fluid by the rotating part 20 to affect the fluid that moves towards the upstream channel, thus creating a suction effect through this increased velocity. This fluid is catapulted back in the channel 40 and follows the rest of the fluid and the biomasses out of the pump 10 to the desired location.

Figure 7 shows a cross-section of one embodiment of a combining of the pump 10 through the rotational axis of the rotating part 20. The obstacle 31 , here shown in the shape of a grid mesh, shows how the channel 40 is separated from the inside of the housing 30 and the rotating part 20 through the channel from inlet 41 to outlet 42, not shown. The rotating part 20 is connected in a fixed manner against a shaft, or a drive shaft 50, here shown as a through drive shaft; it is not limited to being a through drive shaft, it can also be supported against the rotating part 20, partly a through drive shaft, connected against the rotating part 20 with flanges and bolts etc. The drive shaft 50 is furthermore connected against a device for rotation 60, which provides a rotation of the drive shaft 50 and consequently the rotating part 20. In this embodiment, the device for rotation 60 is shown in figure 7 as an electric motor with gears; the device for rotation 60 is not limited to this embodiment, it can also be a hydraulic system, for example. The drive shaft 50 is in this embodiment shown to be connected against the housing 30 with spaces ensuring rotation and seals preventing unwanted leaks of fluid from the housing 30 to the surroundings. Other embodiments ensuring function (rotation) preventing unwanted leaks in connection with the drive shaft 50 is also possible.

Figure 8 shows a different embodiment of the pump 10 shown in

perspective, the rotating part 20 is not shown, where a different form of the housing 30 is shown. The housing 30 is shown as one of two halves that are connected in the cross-section surface, here shown with holes for bolts.

Figure 9 shows another embodiment of the pump 10, the rotating part 20 is here shown to be whole. The rotating part 20 is shown with a smooth surface. Figure 10 shows another embodiment of the pump 10, the rotating part 20 is here shown to be whole. The rotating part 20 is shown with a surface comprising a series of curved blades 21. The blades 21 each follows a helix/vortex-shaped trajectory.

Figure 11 shows the same perspective of the pump 10 as in figure 10: here we have straight blades, blades 21 , where the blades 21 are straight, pointing radially in towards the rotational axis of the pump 10.

Figure 12 shows a cross-section of the pump 10 like in the two previous figures 10 and 11 , again with a series of curved blades, blades 21 , but where the blades 21 are coarser and the blades 21 possess a larger surface area.

The figures 2-5 and figure 7 imply the rotating part 20 as a cone of a clear conical shape comprising one relatively sharp end by the least extensive part of the rotating part 20, and a flat end surface by the most extensive part of the rotating part 20. In the subsequent figures 9-12, the conical shape of the rotating part 20 is rounded closer to a spherical shape, while at the same time comprising an end that still is extensive, and where the rotating part 20 converge from the extensive end to a less extensive end in an axial direction of the rotating axis of the rotating part 20.