WO2011055392A1

WO2011055392A1 - Centrifugal pump with rotating housing

Info

Publication number: WO2011055392A1
Application number: PCT/IS2010/000013
Authority: WO
Inventors: Bjarni P. Magnusson
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-05
Filing date: 2010-11-05
Publication date: 2011-05-12
Anticipated expiration: 2012-05-05

Abstract

The present invention relates to a new device for pumping fluid, the pump having chamber which revolves around a central pressure pipe. Other rotating parts of the pump revolve around this same axis such that the pressure pipe functions as the axis of rotation of the device. During the spinning of the chamber and the internal pump elements pressure due to centrifugal forces is formed in the pump house.

Description

CENTRIFUGAL PUMP WITH ROTATING HOUSING

Field of the Invention

The present invention relates to a device and a method for pumping fluid or air. More specifically the present invention relates to a centrifugal pump with a novel design.

Background of the Invention

Although a number of different pumps for pumping air and fluid have been used, the technology development in this area has not resulted in many new designs in the recent years.

US 3,795,457 discloses a multistage pitot pump, which is a centrifugal pump comprising a rotatable casing within a stationary housing. This pump has means for delivering the fluid to be pumped to the interior of the casing, a pitot tube assembly fixed within and having a pitot tube extending radially in the casing. Then the pump further has a discharge duct for the pitot tube in the pitot tube assembly and coaxial with the casing, in which an annular fluid seal is provided between the casing and the pitot tube assembly, with means for feeding clean fluid to the annular seal.

The problem with traditional pumps, such as the centrifugal pump above is that they require fluid seals, and are therefore less capable of working under„dry" conditions. These seals are sensitive to sand and other little paricles which can accompany the fluid into the pump, which will result in damaging the seals and damage the pump.

The device of the present invention is an improvement of a pump for pumping fluid or air for many purposes, f.ex. in draining construction compartments such as cellars or emptying drill holes. The device of the present invention is furthermore an improvement of pumps driven by an axial system or by stator/rotor means.

Summary of the Invention

The present invention relates to a new device for pumping fluid or air, namely a new type of centrifugal pump. The pump is different from the pumps known in the art in that it's pump chamber revolves around a central pipe, being a pressure outlet pipe. The pump of the present invention can be used effectively to pump fluid or air and can also be used as a vacuum pump.

The pump of the present invention has advantages over traditional centrifugal pumps having a closed wheel. For example, the flange seal at the inlet of such traditional closed wheel is under high pressure and sand as well as all sort of debris is collected there due to leakage, so if the pump runs dry the flange will burn. However, sleeves used in the pump of the present invention are positioned in bearings inside the pump wheel and around the outlet pressure pipe. The pressure is lower around the pressure pipe, which means that sand and debris is not collected next to the sleeve causing damages there. The bearing is almost tight and therefore the new pump is will better withstand to run dry for some period of time.

The inlet, the pump housing and the pump wheels, which are attached to the pump housing, are the rotating parts of the pump. Disk members, which operate functionally with the pump wheels, are attached to a centrally arranged outlet pipe. The disk members and the outlet pipe do not rotate. The rotating parts of the pump revolve around an axis being the centrally arranged outlet pressure pipe, which functions as the axis of rotation of the device. During the spinning of the chamber and the internal pump elements, pressure due to centrifugal forces is formed in the pump house. Due to these properties, the pump does therefore not require a seal or sleeves to prevent liquid leakage between the housing and the disk members.

The pumps discussed herein are fluid pumps, but the pump according to the present invention can also pump air or be used as a vacuum pump.

In a first aspect of the present invention a pump is disclosed, the pump comprises a housing, having a substantially cylindrical chamber with a centrally arranged inlet. The cylindrical chamber has a first and a second end wall section and a connecting cylindrical wall connecting the first and second end wall sections. The pump further comprises a step unit comprising at least one of the end wall sections having at least one channel allowing the to flow there through to the outer rim of the chamber, and The channels are arranged in at least on of the wall sections. The pump comprises at least one inner disc member, where the inner disk member, has at least one channel allowing fluid or air to flow there through from the outer rim of the chamber to the centre. The cylindrical chamber further comprises an outlet arranged at the in one of the end wall sections. The housing has a common relative axis of rotation and a centrally arranged outlet pressure pipe penetrates the at least one inner disk member. In a second aspect of the present invention a method is provided for pumping fluid or air, using the pump of the present invention. The method comprising the steps of:

• rotating the pump housing through a driving means attached to the pump housing,

• directing the fluid or air through a centrally arranged inlet into at least one channel in the first end wall section allowing said fluid or air to flow there through to the outer rim of the chamber, directing the fluid or air through at least one channel in a first disc member allowing fluid or air flow there through from said outer rim of said chamber to the centre, and directing the fluid or air into a centrally arranged outlet pressure pipe,

The method is characterised in that the housing and other rotating parts of the pump have a common relative axis of rotation, and in that said rotation forms a centrifugal force in the pump housing.

Description of the Invention

For the first and the second aspect of the invention as well as the embodiments and examples here below, the pump of the present invention can be used as a fluid or air pump as well as a vacuum pump.

In an embodiment of the present invention the centrally arranged outlet pressure pipe, penetrating the at least one inner disk member is also attached to said at least one inner disk member.

In an embodiment of the present invention the outlet is an extension of the centrally arranged outlet pressure pipe.

In an embodiment of the present invention the pump further comprises a second step unit having:

• a first pump wheel, having at least one channel allowing fluid or air flow there through from the centre of said chamber to the said outer rim, and a

• second inner disk member, having at least one channel allowing fluid or air flow there through from said outer rim of said chamber to the centre, where the step unit is arranged adjacent to the first disc member along the common relative axis of rotation of the pump and wherein the housing and the first pump wheel have a common relative axis of rotation. A pump according to the present invention can comprise a plurality of step units arranged in parallel along the common relative axis of rotation of the pump. In these embodiments, the housing and other rotating parts of the pump have a common relative axis of rotation, whereas other interacting parts of the pump, i.e. the pressure outlet pipe and the disc members are non-rotating parts. In an embodiment of the present invention centrifugal lock is formed when the pump is operating, where the fluid or air seeks towards the middle of the pipe and out of the pump, but not outwards to the sides of the pump and back inot the pump. Therefore, there will not be a circulation of the fluid through the pump providing a more efficient pump.

In an embodiment of the present invention the pump further comprises a pressure compartment formed by the second end wall section and the last disc member. The pressure compartment connects the channels of the last disk member and the outlet pressure pipe. In a preferred embodiment the pressure compartment is the last disc member or the last pump wheel arranged from the inlet and towards the distal end of the inlet of the pump. In this embodiment the channels of the last disc member or pump wheel lead directly into the outlet pressure pipe and the second end wall section does not form the pressure chamber leading directly into the outlet pressure pipe.

In an embodiment of the present invention the pump is used for pumping air. In this embodiment lubricated bearings are arranged at the distal end of the pump wheel as shown in figure 3 to allow the constrained relative motion between the pump wheel and the outlet pressure pipe.

In an embodiment of the present invention the direction of the channels in the end wall section, the disk members and the pump wheels is diagonal. Furthermore, the angle of the diagonally arranged channels in each disc member is opposite the angle of the channels in the adjacent receiving pump wheel.

In an embodiment of the present invention the angel of the channels in the last disk member or pump wheel is perpendicular leading directly into with the shortest distance into the centrally arranged outlet pressure pipe.

In an embodiment of the present invention the inlet is attached to and/or is arranged in the first end wall section.

In an embodiment of the present invention a drive means is attached to the housing. The drive means for rotating the pump housing is selected from any traditional drive means for rotating a pump, such as, but notlimited to a stator and a rotor drive means or a drive axel attached to the second end wall section. In an embodiment of the present invention the pump further comprises a cover housing. The cover is designed to protect the pump, but can also function as bearings for a stator/rotor setup as shown in one of the drawings. In the present context the pump housing is a cylindrical structure with a central inlet arranged in the first end wall section and the second end wall section is closed. The outlet pressure pipe extends from a pressure chamber and through the centrally formed inlet at the first end wall section. The pressure chamber is formed by the closed second end wall section (second end wall section) and the disc member furthest away from first end wall section comprising the inlet.

In an embodiment of the present invention a pump is disclosed, the pump comprises a housing, having a substantially cylindrical chamber with a centrally arranged inlet. The cylindrical chamber has a first and a second end wall section and a connecting cylindrical wall connecting the first and second end wall sections. At least one of the end wall sections has at least one channel allowing the fluid or air to flow there through to the outer rim of the chamber. The channels are arranged in at least on of the wall sections. The pump comprises at least one inner disc member, where the inner disk member, has at least one channel allowing fluid or air flow there through from the outer rim of the chamber to the centre and through there to a connected outlet. The housing and the disk member have a common relative axis of rotation and the outlet of the pump is a centrally arranged pressure pipe, which the pump chamber and the rotating parts of the pump revolve around.

In the most simple embodiment of the present invention there is only one disk member in the housing, being attached to or forming the outlet pressure pipe. The channels in the first end wall section extend from the inlet to the outer rim of the chamber. The first disk member has at least one channel allowing fluid or air flow there through from the outer rim of the chamber to the centre into the connected outlet pressure pipe.

In the present context the each set of

a) a pump wheel having channels extending from the from the centre to the outer rim of the chamber, or the first end wall section having channels extending from the from the centre to the outer rim of the chamber, and b) a disc member having at least one channel allowing fluid or air flow there through from the outer rim of the chamber to the centre of the camber is defined as a step unit. There is no limit to the number of step units used in a particular pump, but the number of step units depends on the performance required for the particular pump. Therefore the first step unit is formed by the first end wall section and the first disk member, whereas the second step unit is formed by the first pump wheel and the second disk member.

In a specific embodiment of the present invention a fluid pump is disclosed, the pump comprises a housing, having a substantially cylindrical chamber with a centrally arranged fluid inlet. The cylindrical chamber has a first and a second end wall section and a connecting cylindrical wall connecting the first and second end wall sections. The pump further comprises a step unit comprising at least one of the end wall sections having at least one fluid channel allowing the fluid to flow there through to the outer rim of the chamber, and The fluid channels are arranged in at least on of the wall sections. The pump comprises at least one inner disc member, where the inner disk member, has at least one fluid channel allowing fluid flow there through from the outer rim of the chamber to the centre. The cylindrical chamber further comprises an outlet arranged at the in one of the end wall sections. The housing has a common relative axis of rotation and a centrally arranged outlet pressure pipe penetrates is attached to the at least one inner disk member.

In an embodiment of the present invention the pump is symmetrical having an inlet on each end of the cylinder, building up pressure from each side in the pressure chamber in the middle of the pump. A centrally arranged outlet pressure pipe leads from the pressure chamber through the end wall section. This embodiment provides a pump where the end pressure is equal from both sides and a counterbalance effect is generated by taking in fluid or air from both sides towards a middle pressure chamber. The disc members of the present invention do not rotate, but are in fact fixed around pressure pipe or alternatively form parts of the pressure pipe. The channels arranged in each disc member lead from outer edge disc member towards the inlet of the next pump wheel as close as possible to the pressure outlet pipe. It is important that the channels start as close to the edge as possible because that is where the pressure is highest. The direction of the channels in the end wall section, the disk members and the pump wheels is diagonal apart from the last disk member or pump wheel, where the angle of the channels is perpendicular, leading directly and the shortest distance into the centrally arranged outlet pressure pipe. The angle of the diagonally arranged channels in the disc members is opposite the angle of the channels in the receiving pump wheels with the exception of the last disk member or pump wheel as mentioned above. This increases the functionality and the efficacy of the pump during use with high flow. When the pump rotates, all the pump compartments of the pump rotate simultaneously as a single unit. A centrifugal force pressure is formed inside each pump wheel with the highest pressure value on the outmost edge of the pump wheel. The channels in the last or the end disc member are directed straight (perpendicular) towards the centre to maximise the flow of fluid or air through the outlet pressure pipe. The pump of the present invention does not require a seal or sleeve around the pressure pipe, where the pump wheel rotates around the pipe. However, bearings in centrifugal water trap can be arranged in the pump wheel as shown in figure 3. The free-space between the internal interacting parts of the pump, such as the pump wheel and the outlet pipe or the disk members and the housing etc is in the range of 1/500 of a millimetre to 1/1000 of a millimetre.

Detailed Description of the Invention

The present invention will now be described in connection with the following drawings using reference characters to indicate the different components of the pump.

Fig. la is a perspective drawing of a pump with one disk member. Fig. lb a schematic drawing of a pump with one disk member.

Figure 2a is a schematic drawing demonstrating the fluid or air flow through a pump of the present invention

Fig. 2b is a schematic drawing showing rotation of a pump of the present invention and the flow in and out of the pump.

Fig. 3 is a cross-section of a pump according to one embodiment of the present invention having two step units.

Fig. 4 is a cross-section on the disc members and the pump wheels from a pump of the present invention.

Fig. 5 is a cross-section on the three major building parts of the pump.

Fig. 6 outlines the centrifugal lock or wall of the pump of the present invention.

Fig. 7 shows the difference between the pump of the present invention and traditional pumps.

Fig. 1 shows a pump according to a simple embodiment of a fluid pump according to the present invention. Fig. la shows perspective drawing of a pump with one disk member. The pump housing 1 is a substantially cylindrical chamber with a centrally arranged fluid inlet 2. The cylindrical chamber has a first 3 and a second (not shown) end wall section and a connecting cylindrical wall 4 connecting the first and second end wall sections. The figure further shows a centrally arranged outlet pipe 5 penetrating the inlet 2 of the fluid pump. The arrows show the flow of fluid in through the inlet and again coming out through the outlet pressure pipe. Figure 1 further shows an outer cover housing 8 and a drive shaft 7 penetrating the outer cover housing 6. The drive shaft is centrally attached to the pump housing 1 rotating the pump housing and other rotating components of the pump. Fig. lb is a cross-section of a simple pump according to one embodiment of the present invention having one step unit. The fluid inlet 2 is shown as a pipe around the outlet pipe 5. The inlet pipe penetrates the first end wall section 3 as a fluid channel 8 leading from the inlet to the outer rim of the first pump chamber. The first inner disc member 9 has fluid channels 10 directing fluid flow from the outer rim of the chamber pump chamber and into the pressure outlet pipe out 5 of the pump. An outer cover housing 6 enclosing the pump is attached to the inlet pipe 2.

Figure 2a is a schematic drawing demonstrating the flow of fluid or air through a pump with a multiple step units. Rotation of the pump housing initiates suction and the fluid or air is drawn through the inlet pipe and into the inlet in the first end wall section . The rotation of the pump is driven by a drive axel attached to the second end wall section of the pump housing. Thereafter the fluid or air flows and then the through channel(s) in the first end wall section to the outer rim of the pump housing. Then the first inner disc member receives the fluid or air and directs the flow from the outer rim of the chamber to the centre. This concludes the flow through the first step unit. The same process is repeated as the fluid or air flows through each pump wheel, attached to the pump housing, from the centre of the pump housing to the outer rim and then through each disk member, attached to the outlet pressure pipe, from the outer rim of the chamber to the centre. In the final step unit the fluid or air flows through the last disk member and directly into the outlet pressure pipe. Figure 2b is a perspective drawing of a pump with multiple step units showing the fluid or air flow. The rotation of the cylindrical housing is shown with arrow A. The figure shows a centrally arranged outlet pipe 5 penetrating the inlet 2 of the pump. The configuration of the inlet means or pipe can be arranged in many ways in order to facilitate the flow of fluid or air from the source of fluid or air into the pump. The embodiment shown in figure 5b is only meant to demonstrate that the centrally arranged outlet pressure pipe functions as the axis, around which the pump housing rotates. In this context, the inlet is centrally arranged as well as the outlet being adjacent to the outlet pressure pipe. This is important as the centrifugal forces drive the fluid or air from the centre of the pump to the periphery of the pump housing. Arrow B shows the flow of fluid or air in through the inlet and arrow C the fluid or air being pumped out of the housing through the outlet pressure pipe. The outlet pressure pipe is further shown extending from the outlet of the pump housing away from the pump. Fig. 3 is a cross-section of a pump according to one embodiment of the present invention having two step units. In this embodiment the inlet 2 is provided as a pipe around the centrally arranged outlet pipe 5 to direct water into the pump. This can be beneficial due to turbulence effects caused by the rotation of the pump during operation. The inlet pipe directs the fluid or air through the inlet in the first end wall section 3. Then the fluid or air flow is directed through channel 8 from the centrally arranged inlet to the outer rim of the first pump end wall section 3. The first inner disc member 9 has channels 10 directing fluid or air flow from the outer rim of the chamber to the centre.

Thereafter the fluid or air flow is directed through channel 11 from the centre to the outer rim of the first pump wheel 12. The second inner disc member 13 has channels 14 directing fluid or air flow from the outer rim of the chamber pressure chamber and from there to through the pressure outlet pipe out 5 of the pump. The housing including the pump wheels and the disk members including the outlet pipe have a common relative axis of rotation 15. This means that the pump chamber and the rotating parts of the pump revolve around the centrally arranged outlet pressure pipe.

An outer cover housing 6 enclosing the pump is attached to the inlet pipe 2. The motor elements of the pump are shown as an electrical coil 16 (stator) on the outside of the outer cover housing and a magnet 17, corresponding to the coil (rotor) on the outside of the cylindrical chamber of the housing of the pump. The pressure outlet pipe, as well as the disc member, the housing and the inlet pipe do not rotate. This prevents air or air bubbles from entering the pump and fluid will not flow out of the pump.

Figure 4 shows the arrangement of the channels in the disc members and the pump wheels from figure 3. The figure shows a cross-section on the disc members and the pump wheels, where the direction of the channels 8,11 of the first end wall section 3 and the first pump wheel 12 is arranged having a reverse angle compared to the angle of the channels 10 of the first inner disc member 9. The channels of disc members lead from outer edge disc member towards the outlet pressure pipe. The inlet of the channel in the adjacent pump wheel is positioned close to the pressure outlet pipe corresponding to the outlet of the channel of the previous pump wheel. The angle of the channels in the disc member 8 is opposite the angle of the channels in the pump wheel 12. The channels shown in this figure are shown as straight channels. In other embodiments the channels can be formed as arched or curved lines to better control the flow of liquid through the channels, which might include removing rotation of the water as it flows through the channels of the disk members and pump wheels of the pump. The tunnels 14 in the second inner disc member 13, which is the end disc member in this embodiment, are directed straight (perpendicular) towards the outlet pressure pipe to maximise the flow of fluid or air through the outlet pressure pipe.

Figure 5 shows the three building parts of the pump individually. In figure 5a the pump housing 1 is shown with channels 8 in the first end wall section 3 of the housing. The first pump wheel is also shown attached to the pump housing. The first end wall section has channels 8, receiving fluid or air from the inlet (not shown) and directing the fluid or air through channel 8 from the centrally arranged inlet to the outer rim of the of the pump housing. The first pump wheel 12 is also attached to the pump housing receiving fluid or air centrally from the first disc member (not shown) directing the fluid or air to the outer rim of the of the pump housing through channels 11. A triangle (arrow) D shown in the space for the second disc member is to demonstrate the pressure difference due to centrifugal forces, the pressure being higher at the outer rim of the of the pump housing and decreasing closer to the outlet pressure pipe. The parts in figure 4a are the rotating parts of the pump. Figure 5b shows the non-rotating parts of the pump. Two disk members are attached to the outlet pressure pipe 5, first and second disk members. The diagonal channels 9 in the first disk member 10 direct the fluid or air from the outer edge of the disc member towards the centrally arranged outlet pressure pipe 5. The direct channels 14 in the second disk member 13 are straight and lead directly into the outlet pressure pipe, the second disk member being positioned adjacent to the second end wall section 17. The flow of fluid or air is shown with arrows from the outer rim of the second disk member and straight into the outlet pressure pipe. The rectangular box E shown in the second disk member indicates an equal pressure from the outer edge/rim of the disc member towards the outlet pressure pipe as the disc members are non-rotating parts of the pump. Figure 4b further shows a connection of the non rotating outlet pressure pipe to an outlet pipe and the configuration of the outlet through an inlet pipe.

Figure 5c shows the non rotating outer cover housing 6 which encloses the pump. The outer cover housing is attached to the inlet pipe 2. The non-rotating outlet pipe is also shown penetrating the inlet of the cover housing. Figure 6 demonstrates the centrifugal forces and the centrifugal lock or wall (F) created by the design of the pump of the present invention. The flow into the pump (B) goes directly into the first end wall section and there from into the first disc member and out of the pump (C) through the pipe. The channels are formed such that they start at a 15° angle and then form a curve in the disc. This requires less energy for operating the pump. The space between the end wall section and the first disc member (or in longer pumps pump wheels and disc members) forms the centrifugal wall or centrifugal lock (F), resulting in more efficient pumping when low amount of liquid is being pumped. The centrifugal wall or centrifugal lock (F) creates rotation in the air or fluid flow in this space resulting in a centrifugal force, such that when the flow is low the fluid or air will not strive towards between compartments. The surface of the rotating parts (end wall or pump wheels) can have small rims to create more resistance, which reduces circulation flow in the pump. If these surfaces are smooth, the inlet needs to be wider to create the centrifugal force. The figure also shows the channels 11 in the disc members are formed in the same direction as the fluid or water (G) is flowing and not against it, which is also a possibility (but less effective)

Figure 7 shows the difference between a traditional pump and the pump of the present invention. The rotation of the pump (A) is indicated with thick an arrow the flow of air or fluid into the pump (B) and out of the pump (C) is shown with smaller arrows.

The pump of the present invention (Fig. 7a) has advantages over traditional pumps in that centrifugal force is created in the compartments of the pump. The compartments are closed where the pressure is greatest due to the channels reduce the pressure. This allows the fluid or air to the centre of the pump and into the next compartment or out of the pump due to drop in pressure.

The inlet to the compartments has open or closed tunnels forming the centrifugal force, so when the fluid or air has passed through the tunnel it flows to the edge of the compartment where the pressure is highest. A wall is formed where the central pipe extends from the compartment, the wall extending further to the centre and therefore more pressure is required for the fluid or air to get out. This is explained as a centrifugal lock or wall (F), which is essential feature of the pump of the present invention. Therfore ' sealings are not needed, but leaks along sealings is a commom problem with traditional pumps.

Traditional pumps (Fig. 7b) do not comprise this centrifugal lock (F) due to the design of these pumps, where the wheels have tunnesl where the centrifugal force is formed within when the air or fluid comes out of the wh el. These traditional pumps have either a flans seal (18) or very small free space. Then the pressure drops and the fluid strives to get back into the inlet. In traditional fluid pumps, the disc has a contact sealing with very little gap, which has a tendency to leak. The traditional airpumps can not have a contact sealing as it would burn up. Instead the discs are made open with smaller channesl, but there is still a considerable leak of air along the spades which causes less efficiency and heat generation.

Claims

1. A pump for pumping fluid or air, said pump comprising :

• a housing, having a substantially cylindrical chamber with a centrally arranged fluid or air inlet,

o said cylindrical chamber having a first and a second end wall section, and o a connecting circular/cylindrical wall connecting said first and second end wall sections,

• a first step unit, comprising:

o said first end wall sections having at least one fluid or air channel allowing said fluid or air to flow there through to the outer rim of the chamber, and o at least one inner disc member, having at least one fluid or air channel allowing fluid or air flow there through from said outer rim of said chamber to the centre,

• said cylindrical chamber having an outlet, wherein said housing has a common relative axis of rotation, and wherein a centrally arranged outlet pressure pipe penetrates the at least one inner disk member.

2. The pump according to claim 1, further comprising a second step unit having:

• a first pump wheel, having at least one fluid or air channel allowing fluid or air flow there through from the centre of said chamber to the said outer rim, and

• a second inner disk member, having at least one fluid or air channel allowing fluid or air flow there through from said outer rim of said chamber to the centre, said step unit being arranged adjacent to the first disc member along the common relative axis of rotation of the pump,

wherein said housing and said first pump wheel have a common relative axis of rotation.

3. The pump according to claim 2, further comprising a plurality of step units arranged in parallel along the common relative axis of rotation of the pump.

4. The pump according to claim 1, wherein the direction of the fluid or air channels in the end wall section, the disk members and the pump wheels is diagonal.

5. The pump according to claim 4, wherein the angle of the diagonally arranged fluid or air channels in each disc member is opposite the angle of the fluid or air channels in the adjacent receiving pump wheel.

6. The pump according to any of the preceding claims, wherein angel of the fluid or air channels in the last disk member or pump wheel is perpendicular leading directly into the centrally arranged fluid or air outlet pressure pipe.

7. The pump according to any of the preceding claims, where the inlet is attached to and or arranged in the first end wall section.

8. The pump according to any of the preceding claims, wherein a drive means is

attached to the housing.

9. The pump according to any of the preceding claims, further comprising a cover

housing.

10. A method for pumping fluid or air, using a pump according to claims 1-9 the method comprising the steps of :

• rotating the pump housing through a drive means attached to the pump housing,

• directing the fluid or air through a centrally arranged fluid or air inlet into at least one fluid or air channel in the first end wall section allowing said fluid or air to flow there through to the outer rim of the chamber,

• directing the fluid or air through at least one fluid or air channel in a first disc

member allowing fluid or air flow there through from said outer rim of said chamber to the centre, and

• directing the fluid or air into a centrally arranged outlet pressure pipe, characterised in that said housing and other rotating parts of the pump have a common relative axis of rotation, and in that said rotation forms a centrifugal force in the pump housing.