KR100245892B1 - Vertically reciprocating pump - Google Patents

Abstract

The vertical reciprocating pump for raising fluid comprises a support 81,82,83 with a hub extending downwards and a reinforcement leg, the rods 7,71,72 passing through the hub, the hub being the rod A piston 8 mounted as a component parallel to the piston; And a flap valve disposed on the supports 81, 82, 83 to close the piston 8 by the weight of the fluid column above the piston 8 or to pass the fluid when the piston descends from the water column in the ascending pipe. It is characterized by.

Description

Vertical reciprocating pump

Vertical reciprocating pumps of this kind are already known, in particular as indicated in the literature (OAPI 06 221, published March 23, 1979). This type of pump is designed to elevate the fluid present on the ground, such as groundwater, oil, and the like.

Known vertical reciprocating pumps designed to raise water are operated manually. Depending on the depth of the fluid plane, the pump consists of one or a set of vertical rods holding one or a plurality of flap-valve pistons.

Known pistons generally consist of a cylinder of a certain length, which is provided with a gasket which slides in the riser on the circumference of its one end (edge), in particular towards the top.

This part of the cylinder is engaged in a sliding manner on the body, which consists of ribs and ends with a flap valve at the bottom. When the piston cylinder lowers the flap valve, the piston closes. In the opposite case, the fluid can pass through the piston. These two different positions between the cylinder and the flap valve correspond to the downward movement of the piston in the water column in the pump body or riser and the upward movement of the fluid column on the piston, respectively.

Multi-piston pumping devices are also known (FR-88 09 575), which consist of a cylinder with a so-called alveolar structure at the bottom. This cylinder is fitted over a rod that controls the reciprocating motion. On the bottom of the porous flap valve is provided which is supported by the tubular element against the porous structure described above. This tubular element passes through the interior of the cylinder and is supported against a stop integrated with said rod. A nut and counternut are provided for locking the assembly under the piston, ie under the porous bottom of the cylinder.

Known piston cylinders have the following disadvantages: the piston substantially rubs against the inner surface of the lift column, and this friction increases when the riser maintains deformation as a result of the ground swing, because The piston is forced to follow this modified path.

A gasket applied to the riser or the inner wall of the cylinder along the upper edge of the cylinder itself increases friction as a result of the pressure exerted on the gasket and the cylinder by the fluid column.

The pumped fluid is often filled so that the particles eventually accumulate in the piston's flap seat. The piston therefore loses its seal and reduces the flow of the pumped fluid. As a result, the piston must be replaced frequently, increasing the operating cost of the pump.

Since the flap valve is a consumable, it needs to be worn out and replaced. In this case, the piston assembly must be disassembled to access the flap valve, the flap valve to be replaced must be removed, and a new flap valve installed. For this purpose, it is necessary to completely remove the piston from the rod so that a new flap valve can be installed.

The above process is relatively long compared to the replacement of very simple parts.

In addition, because the flap valve is located in the cylinder, suspended solid particles in the water inside the piston gradually build up at the bottom when the pump is stopped. Since the piston is not fully closed, suspended solid particles can leak and settle between the edge of the diaphragm and the inner wall of the piston during the time needed to allow the flap valve to rise without rubbing against the piston. Is carried with him.

This situation is disadvantageous for pistons that are not submerged; If for any reason the pump stops for a given time, ie hours or days, solid particles will clog the valve, and experience has shown that in this case all pistons in water are removed to disassemble the piston and release the stuck diaphragm. Should be removed.

This is a significant and inevitable drawback as it constitutes a practical task, because it is a pump operated by an electric motor that is only powered manually or powered by a solar cell without a buffer cell of sufficient capacity for continuous operation. Even if the pump is inevitably often stopped.

The present invention relates to a vertical reciprocating pump for raising a fluid present on the ground, as described in the preamble of the claims.

The invention is now described in more detail by the accompanying drawings as follows:

1 is a schematic longitudinal sectional view of a vertical reciprocating pump;

2 is a schematic partial longitudinal sectional view of a piston for raising the rod as described above;

3 is a schematic longitudinal sectional view of a piston for lowering the rod as described above;

4 is an axial sectional view of the piston support along the IV-IV segment of FIG. 5;

5 is a top view of the piston support;

6 is an exploded view of the piston;

7 is a perspective view of another embodiment of a piston;

8 is a side view of a support skeleton according to another embodiment of the present invention;

9 is a top view of the two support parts in the installation position;

10 shows the complete support assembled on the rod 7 described above, according to the segment

Partial longitudinal section view;

11 is a perspective view of another embodiment of the piston and the assembly method, which is a support

Is confined to the upper part of;

12 is a partial cross sectional view of a piston provided with a skirt;

13A-15B are another embodiment of the piston support; And

16 shows a complete piston provided with a support according to one of the preceding embodiments;

Shows.

It is an object of the present invention to efficiently raise fluid from a very deep fluid plane, to have a very regular flow rate even after long periods of use, to be simply repaired or replaced if necessary, and to be on the water surface when the pump is stopped The disadvantage is to produce a reliable reciprocating pump having a simple structure while preventing the pistons or the flap valve of the piston from being blocked by any particles suspended in water.

For this purpose, the present invention relates to a vertical reciprocating pump corresponding to the aforementioned type, according to the claims set out below.

The piston can be easily installed / removed from the element assembly constituting the rod or a set of pump rods for substantial depth.

Since the production is simple thanks to the small number of simple components constituting the piston, it is possible for an inexperienced worker to assemble and install the piston even in a poor installation environment. This advantage also applies to maintenance.

In addition, according to the structure of the piston, sedimentation of solid particles and sticking of the piston itself in the flap valve or the tube of the piston is substantially prevented because the piston is washed during operation and at the end of the pumping process.

The particular form of the piston has the advantage of keeping the piston in minimal contact with the inner surface of the riser.

In the simplest flap valve, the valve consists of an ascending diaphragm seated on a support to support the column of water, which is adapted to its favorable operating characteristics.

The diaphragm forming the flap valve is cut to a distance from the outer edge to the hole and the rod is passed through the hole to engage the diaphragm without threading the rod.

The split disc shaped diaphragm can be placed very easily on the support by simply releasing one of the two nuts supporting the support. This can be done very quickly and there is no need to remove the rod support, ie loose the nut in question.

The diaphragm may also consist of a plurality of fragments which partially overlap each other. Embodiments of this type have the advantage of simplicity of installation and dismantling, ie the diaphragm has the flexibility to allow different fragments to rise partially or relative to one another.

Depending on the use of the pump and the operating conditions, the piston has a size approximately similar to that of the inner cross section of the riser.

In order to easily operate the pump and reduce the power required for pump operation, there is a greater effect than if the pump is operated by a motor that is supplied with electrical energy to the power line rather than a relatively limited energy source.

In addition, since there is at most a linear linear contact between the piston and the inner surface of the tube even when the ascending pipe is deformed as a result of ground swings, the linear contact does not substantially impede the reciprocating motion of the piston, in particular the piston It does not increase the friction between the tube and the inner surface of the pipe.

In the case of pumps used in deep water, the diaphragm flap valve will not resist the column of water, in which case the flap valve is made of rigid material, more specifically, the support is a vertical triangular leg. a leg, the leg of which one side is attached to the upper and auxiliary hubs and is also coupled to the periphery of the entire height of the support and formed on the upper portion of the support branch for support and attachment of the flap valve; The flap valve consists of a disk piece whose one radial surface is respectively connected to the upper radial portion of the leg, and the other radial surface is supported closed on the upper radial portion of the subsequent leg.

This embodiment provides the advantage of enabling particularly efficient pumping of very high water columns without compromising the descending ease of the piston or the force of the piston.

In addition, a fluid coating is formed between the tube wall and the piston or pistons, by which means the friction is substantially reduced to zero, especially since no gasket is applied between the piston and the wall scraping off the fluid coating.

According to Figure 1, the vertical reciprocating pump according to the present invention is composed of a base (1) supported on the ground 2 above. Vertical aisle 3 merges with base 1; The vertical passage pipe is composed of a fluid discharge pipe 4 discharged to the tank 5. The lower end of passage tube 3 extends by rise tube 6. The lift tube 6 houses a piston control rod 7 provided with one or a plurality of pistons 8 described later. At the lower end of the riser tube 6 a base flap valve 9 is provided.

The rod 7, which can also be an assembly of rods, ie attached rods in turn, is controlled in reciprocating motion by means of a mechanism 10 which is only very schematically shown, depending on the depth of the plane in which pumping is being performed. This mechanism 10 is supported by the frame 10. The instrument 10 may be operated manually, by an animal, or by a thermal or electric motor, and in the latter case an independent electrical power supply such as a solar power cell may be used.

The vertical reciprocating motion of the rod 7 and the piston 8 first raises the fluid column supported on the piston 8 to discharge a certain amount of fluid into the tank 5; The rod 7 then lowers the piston 8 inside the fluid column contained in the riser 6 and is supported by the bottom flap valve 9. When the piston 8 reaches the lower end of the passage, the piston 8 is lifted by the rod to raise the fluid column above each piston 8. At the same time, the piston on the bottom flap valve 9 creates an air pressure depression on the flap 9. This pressure drop draws fluid into the tube 6 through the bottom flap valve 9, thereby allowing the cycle to continue.

Figures 2 and 3 show the structure of the first embodiment of the piston 8, ie the lowering state of the piston 8 moving by the rod 7 is described first in Figure 2, and the rising state of the piston is shown in Figure 3.

In these figures the same reference numerals as in FIG. 1 are used to refer to the same elements.

FIG. 2 is a partial axial sectional view of the riser tube 6 showing the rod 7 or set of rods 7 composed of another rod portion 71 connected to the rod portion 72 by a grooved sleeve 74; FIG. The lower end 73 of the rod 71 is simply grooved beyond the length needed to clamp the water pipe 74 to accommodate the piston 8. The piston 8, which is attached between the lower nut 12 and the upper nut 13, consists of a disk-shaped support consisting of an outer ring 81 connected to the upper hub 82 by a radius 82, the rod 71 (or groove). This lowered portion 73 passes through this hub and the support consists of the rod 71 also passing through the lower hub 84; This lower hub 84 is supported by the legs 85 connected to the ring 81.

The piston 8 has a flap valve on the support, which in this case consists of a flexible diaphragm 87.

Since the support is in the form of a radius, as shown by arrow C, it is possible to pass the fluid (elevated) in the direction of arrows A, B as the piston descends from the fluid column of the riser tube 6.

This lowering of the piston 8 raises the septum 87.

FIG. 3 shows the movement of raising the rod 7 (or rod element 71, 72 in the case of a pair of rods) which is identical to the rod of FIG. 2, according to the upward movement indicated by arrow D. FIG.

During this ascending movement, the fluid column bears the flap valve 87 against the support, in particular in the manner in which the upper part of the piston 8 support, ie the ring 81, the radius 82 and the upper hub 83, are thus sealed to the piston 8. Close; This makes it possible to raise the fluid column.

As already mentioned, the piston 8 is fixed on the rod 7 by nuts 12 and 13, which also support the flap valve 87.

During the upward movement, the leg 85 transmits some of the force exerted on the outside of the support to the lower hub 84.

According to FIGS. 2 and 3, the outer ring 81 of the support has an angled or rounded edge, thus minimizing contact between the piston 8 and the inner surface of the riser tube 6 to a minimum. Because of this linear contact, which is circular and does not follow a cylindrical surface, it is possible to absorb any deviations or differences in the alignment, for example in the warp between the rod 7 and the riser 6, thus minimizing the frictional force against the upward movement. Will be reduced.

The flap valve 87 can also be flexibly lifted from the supports 81, 82, 83, allowing fluid to clean the supports, preventing the accumulation of any solid particles that would prevent the piston from closing when in the upward motion. .

While the pump is stationary for a long time, even when suspended particles settle around the gap between the edge of the ring 83 and the inner surface of the ascending tube 6, when the ascending or descending motion is resumed, the coalescence of the particles will be removed. This is because the movement will be transmitted directly to the piston 8 by rods or sets of rods 7,71,72.

The cross sections of the riser tube 6 and the piston 8 are circular, but there is no limit to this form and polygons such as hexagons or squares are not excluded.

4, 5 and 6 show the structure of the piston described above in detail. 4 shows a cross-sectional view of the flange of the support, branch 82, and upper hub 83 with the outer ring 81, one leg 85 in cross section and the other in cross section and the intermediate ring 86 , A plan of the lower hub 84 is also shown.

FIG. 5 is a top view corresponding to FIG. 4 showing an upper hub 83 having half of the diaphragm 87 and different portions of the support, in particular radius 82, rings 81,86 and a gap for passing the fluid to be pumped between the rings. have.

The exploded view of FIG. 6 shows these different parts, ie the flap valve, the support and the component parts 81, 82, 83, 84, 85, 86 in the form of a diaphragm 87.

The piston support is, for example, a part produced separately from a cast plastic material. The flap valve 87 is preferably made of a flexible material such as synthetic rubber or plastic material.

The size of the flap valve covers the hole of the support and extends near the inner surface of the riser tube, which has a sufficient gap to leave a fluid film along the riser wall.

The flap valve 87 may be a disc shaped part that can be installed on the rod 7, but according to FIG. 6 it is conveniently split, ie the disc forming the flap valve is cut along line 88. This cut line may be a line joining the two cut edges of the disc. This cutting line 88 extends from the outer edge 89 to the hole 90 in the middle of the flap valve 87 which receives the rod 71 7.

Cutline 88 edges may also be overlapped by dashed line 91 as shown. In effect, this dashed line is the edge of the disk portion located below the upper edge, the two edges of the disk being superimposed on an angle segment formed between the lines 88,91.

According to this embodiment of the flap valve, it is possible to simply replace the worn or damaged flap valve without disassembling the actual support.

FIG. 7 is an exploded view of a modified embodiment of the piston, which is distinguished from the previous piston by a particular form of the flap valve and the method of attaching the flap valve.

All parts that are identical to the parts of the previous embodiment have the same reference numbers.

This piston variant is distinguished by the form of the flap valve, which consists of four segments 92,93,94,95. One of the fragments 92 is separated from the other fragments in the assembled position. These fragments may have the same shape and the same size and may overlap in a fish scale fashion. As can be seen in the variant shown in Fig. 7, the two fragments 93,95 on the supports 81-86 are first placed in the radially opposite position, and then the other two fragments 92,94 on the previous fragments 93,95, indicated by dashed lines. As slightly superimposed. In the case of this type of flap valve, when the piston descends into the water, the upper pieces 92,94 are raised before the remaining pieces 93,95. One of the fragments 92 covers one quarter of the upper disc angle so that it can overlap as shown in the figure.

The fragments are extended by two curved protrusions or hooks 96,97 in the hole. Between these two projections 96,97 there is a slit 98.

Each fragment is defined by the projections 96,97 and slit 98, for example one of the fragments, over a radial branch 82, which is to be placed between the inner ring 83 and the adjacent neighboring intermediate ring 86. You can do that. In the example shown, the first intermediate ring 86 is very close to the upper hub and the spacing between the two rings provides space for the projection 96,97.

When the fragments of the flap valves 92-95 were positioned on a support previously attached to rod 7 (not shown), the upper attachment device was installed, with two halves 99A, 99B, each of which terminated with assembly projections 100,101. Consists of. These two parts 99A, 99B have an inner surface that is grooved so that the two parts combine to form a single continuous groove. These parts are assembled by screws, not indicated, for example, as indicated by dashed line 104.

The parts 99A, 99B have their bases extended by half-flanges 105, 106; When the part is assembled, the half-flange is complete, forming a flange that supports fragments 92-95 against the preloaded piston 8 support.

In fact, after the fragments 92-95 have been placed, the two parts 99A, 99B of the upper attachment device 99 are assembled on the grooved portion 73 (Figs. 2, 3) of the rod 71, and then this device 99A, 99B. Is screwed to fix fragments 92-95.

The two parts 99A, 99B can be clamped against each other to lock this nut so that the screw is not loosened by the effect of vibration, so that, even if there is a given amount of movement between the two parts, A groove made of surfaces 102 and 103 can be locked to prevent the screw from loosening.

According to a variant not shown, the flap valve is in the form of a tulip attached near the bottom edge of the outer ring 81; The flap valve is opened around a rod that is optionally provided with a seal to form a seat for the edge of the flap valve. In this variant the "petal" edge of the flap valve on the open side can be joined by a ring which engages the rod.

According to a further variant, the tulip-shaped flap valve consists of a single diaphragm having a frusto-conical shape attached by an outer edge, the inner edge of which optionally comprises a ring surrounding the rod. Abuts a provided hole; The diaphragm may also be provided with a part that forms a shutting seat, the bore edge of the flap valve being supported against it.

8 to 10 show another embodiment of the piston support according to the invention. This support consists, for example, of two completely identical parts 200,201, ie substantially corresponds to the support of FIG. 1, which is intersected by a diameter plane (the plane passes through the axis of the rod). The two half parts are therefore produced from a single mold. In addition, the two parts 200,201 are assembled on the rod 7 by an assembly of a collar type. For this purpose, projections in the upper and lower regions of each part complete the part to form a collar.

More specifically, according to FIG. 8, the left component 200 consists of an outer ring 81A which is connected to the hub 83A or the inner ring by a radius 82A. Indeed, in both cases of ring 81A and another ring 83A, half-rings are needed. The same applies to the intermediate half-ring 86A.

The "right" part 201 consists of the same elements as the "left" part 200 and has the same reference, suffix A is replaced with suffix B.

The half-ring 83A is also longer than the thickness of the radius 82A or the outer ring 81A so that the projections 108A, 109A can be used to assemble the two parts 200,201.

The lower hub 84A also corresponds to a half-hub whose sides are extended by the projections 110A, 111A, which are also designed to be assembled in a ring fashion together with similar projections 110B, 111B of the lower hub 84B of another component 201 ( 10).

10 also shows the beginning of branches 85A, 85B of two parts 200,201.

According to FIG. 9, two parts 200, 201 are arranged on both sides of the rod 7. It is sufficient to assemble the two parts by projections of the upper ring (which is partly accidentally covered by the radius 82A, 82B).

The lower collars are also assembled.

This embodiment of the support shows additional advantages that can be obtained by simplifying production, since the mold simply corresponds to the half shape of the support. Due to the symmetry, the same mold can be used to produce part 200,201.

The aforesaid hooks also greatly facilitate the maintenance of the installed pumps, either by simply unscrewing to loosen the supports according to rod 7 or by reconnecting the supports along the axis of rod 7 by the connection of the two rod elements 71. Because it is interlocking. The support can be attached to any position by the assembly made of this ring. Installing the flap valve is as simple as the flap valve of FIG. This flap valve is supported against the top of the support by an attachment part similar to a ring not shown in the figure.

The perspective view of FIG. 11 shows a support consisting of two parts 200,201 similar to the support of FIG. 9. For simplicity, legs 85A ... etc. Are not shown in FIG.

These legs are preferably placed in a plane different from the plane in which the two halves 200,201 join together.

Depending on the mating plane, on the lower part the two parts 200, 201 constitute ribs 112A, 112B with which the clamps 113, 114 are engaged. In some cases, this assembly method is more convenient than the rather difficult screw connection method for connecting the upper part of the support. On the other hand, in the lower region at the height of the lower hub, parts 200,201 can be connected by screw connection or clamp connection as described herein. In this case the frame can be parallel to the horizontal axis of the support and can act vertically along the riser. The clamp can be locked by a small screw to prevent it from being dislodged by the vibration effect.

FIG. 12 shows a modified embodiment of the support, for example as shown in FIG. 4. This support is completed by a cover 115 that leaves a gap 116 along the riser tube wall sufficient to prevent any friction while nevertheless creating a load loss area to slow the flow of pumped water. As is apparent from FIG. 12, the cover 115 is disposed below the support rather than the side of the flap valve 87.

Another embodiment of a piston according to the present invention is now described by FIGS. 13A-15B, 16, which show other variations to the support and piston assembly.

According to FIG. 13A, the support 300 consists of a tubular hub 384, which combines the upper hub with the auxiliary hub of the previous embodiment.

The leg 385 consists of a triangular webbed shape with a square side that has one side attached to the hub 384 and the other side having a radius 382 that forms the support surface of the unmarked flap valve.

Other modifications to the support consist of four triangular webs, but this number can vary, for example, to 3 or 5, although even numbers are more desirable for production due to the evenly provided planar symmetry.

The variant of FIG. 13B corresponds to the support form of FIG. 13A, except that this form is two symmetrical halves along the plane passing through the rod axis. These two halves 301 ', 302' of the support 300 'are assembled by a webbed shape with roughly provided connection holes 386'.

The embodiment of the support variant 400 according to FIG. 14A and the two symmetrical parts 400 'shown in FIG. 14B is substantially the same except that the web surface is replaced by a surface 482 wider than the web thickness. It corresponds to FIG. 13A, 13B.

In the case of Figure 14B, the support plane 482 'corresponds to the surface 482'A that is crossed by the plane of symmetry and reduced in half.

The embodiment with the support variant 500 of FIG. 15A and the two symmetrical halves according to FIG. 15B is distinguished from the previous variant by a webbed shape 585,585 'with a thickness varying from top to bottom. In the upper portion, webbed 585,585 'forms a relatively wide support surface of equal size throughout its length. This thickness decreases toward the bottom.

In the case of the two-piece support 500 ', the webbed shape 585' has an overall thickness reduced in half by crossing by the plane of symmetry.

In other variations of Figs. 14A to 15B, descriptions of components common to Figs. 13A and 13B are not repeated.

According to FIG. 16, the piston is composed of a support 600 consisting of one of the supports of FIGS. 13A-15B and a flap valve 610 in the form of a disc fragment made of rigid material.

The flap valve piece 610 has its straight side 611 bonded to each webbed support surface 682, while the other straight side 612 is freely mounted on the subsequent webbed support surface 682 (the flap valves each other). Reference numbers for other parts are the same).

The flap valve piece 610 can be rotated around the junction of the straight one side 611, for example, as shown in FIG. 16, and can be lowered into the fluid (water) as shown in FIG. 16.

During the ascending movement, the components of the flap valve 610 are folded against the support surface 682 of the support.

The act of raising the part 610 is carried out substantially without exceeding the vertical position, so that the driving force of the water generated when the piston is raised can always fold each piece of the flap valve in the same direction.

The direction of opening the component 610 is preferably the same for all remaining fragments of a single piston. However, this direction may be reversed from piston to piston in order to prevent the occurrence of torque in FIG.

The piston type according to FIG. 16 is particularly advantageous in order to effectively withstand the substantial height of the water column when descending very deeply.

Claims (11)

A riser tube 6 which is submerged in the fluid plane, thereby connecting the outlet height of the pump to the fluid plane to be pumped; A bottom flap valve 9 provided in the lower end unit of the elevating tube 6 to introduce fluid into the elevating tube, while maintaining the fluid column in the elevating tube; Rods 7,71,72 for supporting one or a plurality of pistons 8 controlled by reciprocating motions C and D for raising the fluid column; The piston 8 which passes the fluid when descending from the fluid column and closes when raised; In the vertical reciprocating pump for raising the fluid present on the ground, which is connected to the rod 7 and consists of adjusting means 10, 11 for controlling the raising and lowering of the piston in the rising pipe 6, A piston 81,82,83 with a downwardly extending hub and reinforcing legs, the rods 7,71,72 passing through the hub, the piston being mounted as a component parallel to the rod 8 ; And Consisting of a flap valve disposed on the supports 81, 82, 83 to close the piston 8 by the weight of the fluid column above the piston 8, or to pass the fluid when the piston descends from the water column in the ascending pipe. Vertical reciprocating pump, characterized in that. The flap valve 87 according to claim 1, wherein the flap valve 87 is cut through the diaphragm 88 cut between the outer edge 89 of the flap valve and the hole 90 used for the passage of the rod 7 so that the diaphragm can engage the rod without threading the rod. A pump, characterized in that configured. The pump as claimed in claim 1, wherein the support consists of an upper hub 83 and a wheel-shaped component disposed below the hub 83 and coupled to an auxiliary hub 84 connected to the ring 81 of the wheel by a leg 85. . The support of claim 1, wherein the support consists of a vertical triangular leg, the one side of which is attached to the upper and auxiliary hubs and is coupled to the periphery of the entire height of the support to support and attach the flap valve. To the upper part of the support branch; The flap valve consists of a disk piece whose one radial surface is respectively connected to the upper radial portion of the leg, and the other radial surface is supported closed on the upper radial portion of the subsequent leg. Pump. 5. The pump as claimed in claim 4, wherein the support forms four upper radial portions together with the legs, each upper radial portion receiving a flap valve piece consisting of four pieces. The pump as claimed in claim 1, wherein the upper portion of the support consists of an outer ring 81 connected to the upper hub 83 by a radius. The pump as claimed in claim 1, wherein the flap valve 87 is composed of a disk-shaped diaphragm covering the entire upper surface of the supports 81, 82, 83. 2. The pump according to claim 1, wherein the support consists of two parts 200, 201, in particular flat plate parts which are symmetrical to each other, said parts being coupled to each other with a rod 7 received therebetween. 9. The upper half-hubs 83A, 83B and lower half-hubs 84A, 84B of each of the support parts 200, 201 are connected to the hub halves 83A, 83B of the upper part in the joining plane to be assembled in a collar manner. A pump extending to each side by the projections 108A, 109A: 108B, 109B and the projections 110A, 111A: 110B, 111B for the hub halves 84A, 84B of the lower part. 8. The pump as set forth in claim 7, wherein the flap valve 87 is configured as a split disc so that the flap valve 87 can be installed without being sewn on the rod 7. 8. The flap valve according to claim 7, wherein the flap valve consists of fragments 92 to 95, which terminate in the center of the bent projections 96, 97 and are designed to be inserted into the gap between the ring of the hub 83 and the intermediate ring 86, And the top attachment device is configured to lock the fragment against the support.

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