EP2359005A2 - Sliding vane pump - Google Patents

Abstract

The invention relates to sliding vane pumps having a rotor which is mounted in a pump housing and driven by a shaft, a plurality of vane plates mounted on the outer periphery of said rotor and an outer ring surrounding the rotor and the vane plates, said outer ring being arranged either directly in the pump housing or in an adjusting ring that can be displaced along predetermined pathways inside the pump housing. The aim of the invention is to devise a novel sliding vane pump having a novel pump chamber geometry which allows a fluidically optimum complete filling of the pump chambers especially at speeds in the range of 4500 rpm up to more than 6000 rpm for all designs of sliding vane pumps and which can be easily manufactured. The sliding vane pump according to the invention comprises transverse grooves (12) which extend in the cylindrical surface area of the rotor (3) between the bearing grooves (4) of the vane plates (5) across the entire rotor width and which are arranged in parallel to the bearing grooves (4) of the vane plates (5) and interspaced from the bearing grooves (4) by a bearing web (11), and is characterized in that the transverse grooves (12) have an asymmetrical cross-section (13) which has a lowest point (14) in every vane chamber (10), said lowest point being always arranged after the vane chamber center axis (15) when seen in the direction of rotation.

Description

 Vane pump

The invention relates to vane pumps with a mounted in a pump housing, driven by a shaft rotor, a plurality of outer rotor of this rotor mounted wing plates and a surrounding the rotor and the wing plates outer ring, this either directly in the pump housing, or in a pump housing along predetermined paths movable adjusting ring is arranged.

In the prior art, the most diverse designs of

Vane pumps described above. For example, describe the

DE 29 14 282 C2, as well as the DE 103 53 027 A1 each controllable

Vane pumps with a linearly displaceable adjusting ring to achieve a variable delivery capacity.

In DE 195 33 686 C2, another design of a controllable

Vane pump with a pivotally mounted about a pin collar described above.

In most cases, on both sides of the rotor of a vane pump on the one hand a

Saugniere and on the other hand to this offset by 180 ° a pressure kidney arranged. All the aforementioned designs have in common that the inner ring between the bearing points of the separating elements is always arcuate, that is formed as a circular arc corresponding to the outer diameter of the respective inner ring.

In other property rights / patent applications, such as in DE 33 34 919 C2, DE 44 42 083 A1 or in DE 602 07 401 T2 are described designs of vane pumps with variable capacity, in which at / in the bottom of each cell chamber ie in the "cylinder surface" of the respective rotor, extending over the entire rotor width, parallel to the bearing grooves of the wing plates at the bottom of each cell chamber arranged, spaced from the Lagernuten, always symmetrical to the center axis of each cell chamber, in its cross-section trough-shaped, usually almost trapezoidal shaped Cross grooves are arranged, which are often intended to increase the volume of the respective pump cell chambers to a maximum possible for the respective design.

In another patent application, such as in DE 10 2004 019 326 A1 other cell pumps, such as roller cell pumps are described in which at / in the lower edge of each cell chamber, ie in turn in the "cylinder surface" of the rotor, formed symmetrically to the center axis of each cell chamber, are arranged over the entire rotor width, arranged parallel to the bearings of the cylindrical rollers at the bottom of each cell chamber, in their cross section almost rectangular, trough-shaped transverse grooves are arranged, which also significantly increase the volume of each pump chamber, and even approximately double in the design presented here A further cell pump is presented in DE 10 2006 061 326 A1, which is a variable-volume pendulum slide machine in which, in FIG. 1, both at / in the lower edge of each cell chamber, ie in the "cylinder jacket surface" of the inner rotor at the same time also in the "Cylind surface of the outer rotor, also over the entire Rotor width extending to the center axis of each cell chamber also symmetrically formed, in the "cylinder surface" of the inner rotor in its cross-section half round and in the "cylinder surface" of the outer rotor in its cross section almost trapezoidal, trough-shaped transverse grooves are arranged, which also in this design a very special Wing cell pump to increase the volume of the respective pump chamber as possible to a maximum.

As the prior art described shows, the pump designers have been and are endeavoring for decades to provide the largest possible inflow cross-sections for the best possible filling of the displacement cells by means of symmetrically designed "clearances" arranged in the rotor walls of the most varied vane pump designs However, a major disadvantage of the aforementioned designs of vane pumps of the current state of the art still exists today in that at drive speeds in the range of 4500 U / min to over 6000 U / min out (ie when using these vane pumps, for example, as directly from the crankshaft of an automotive engine driven oil pumps) high V loss performance, a rising noise with increasing speed and a rising speed with increasing wear occurs.

The object of the invention is now to develop vane pumps, which avoid the aforementioned disadvantages of the prior art and in addition to the power losses, the noise and wear compared to the prior art pump designs, especially in the speed range from 4,500 U / min to Beyond 6,000 rpm, significantly reduced, but manufacturing technology are easy to manufacture and are also characterized in all speed ranges by a high reliability, a long life, a high specific flow rate and high efficiency.

According to the invention, this object is achieved by a vane pump with a rotor (3), which is mounted in a pump housing (1) and driven by a shaft (2), a plurality of wing plates mounted in bearing grooves (4) of the rotor (3)

(5) and an outer ring surrounding the rotor (3) and the wing plates (5)

(6) with a suction kidney (8) arranged on a pump housing (1) and a pressure kidney (9) offset 180 ° in the pump housing (1), with at the bottom edge of each cell chamber (10), i. in the cylindrical surface of the rotor (3), between the bearing grooves (4) over the entire rotor width, parallel to the bearing grooves (4) of the wing plates (5) arranged by the bearing grooves (4) about a bearing web (11) spaced transverse grooves ( 12), which according to the invention are characterized in that these transverse grooves (12) have an asymmetrical cross-sectional profile (13), which in each cell chamber (10) via a trough (14), seen in the direction of rotation always after the cell chamber center axis (15) is.

By means of this invention, asymmetrical design of the cross-sectional profile (13) of the transverse groove (12) in vane pumps were surprisingly the power losses, noise and wear compared to the previously described in the prior art pump designs in the speed range from 4,500 U / min to over 6,000 U / min addition significantly reduced.

The solution according to the invention is easy to manufacture in terms of production and is characterized in all speed ranges by a high reliability, a long service life, a high specific volume flow and also a high degree of efficiency.

In test series it was found that the cell chambers of the vane pumps described in the prior art with symmetrically strong "enlarged" cell geometry, especially in the speed range from 4,500 rev / min to more than 6,000 rpm, during the "suction phase" no longer "completely" filled become.

As a result of this "incomplete" filling of the cell chambers occurs in the prior art described in the art vane pumps with symmetrically enlarged cell cavitation phenomena, which is a cause of the occurring in the speed range from 4,500 rev / min to over 6,000 rpm noise developments, the in occurring in this speed range wear, but also for the power losses occurring in this speed range.

Surprisingly, in the experiments carried out with the novel cell chamber geometry, according to the inventive solution, in contrast, even at speeds in the range of 4,500 U / min to more than 6,000 U / min, always an optimal, complete, cavitation-free filling of the cell chambers according to the invention ( 10) realized without problems.

The novel, according to the invention, an asymmetrical cross-sectional profile (13) having transverse grooves (12) which have in each cell chambers (10) via a trough (14), seen in the direction of rotation always after the cell chamber center axis (15), ensure in consequence of their optimal In addition, very special fluidic design also in the entire speed range a low-friction and aerodynamically optimal complete filling of the pump chambers. It should also be emphasized that, in addition to a complete and optimal filling of the cell chambers (10) at the same time but also with respect to the previous state by means of the inventive solution even at the previously very critical speeds, in the range of 4,500 rev / min to more than 6,000 of the Technique a very optimal and fast, low-friction emptying of

Cell chambers (10) is ensured.

In this context, it is furthermore very advantageous that the transverse grooves (12) according to the invention can also be produced very easily in terms of production engineering.

In the test series carried out with the solution according to the invention it was found that by means of the asymmetrical

Pump cell cross-section also surprising effects occur, which are probably called in conjunction with the reflection of the inflowing into the cell chambers liquid on the wing plates.

All these surprising effects caused by the solution according to the invention ensure a complete filling of the

Pump chambers beyond the 5000 rev / min, as well as their optimal

Emptying while also significantly reducing the

Power losses and wear in vane pumps.

Particularly advantageous embodiments, details and more

Features of the invention will become apparent from the dependent claims and the following description of an embodiment of the invention in conjunction with two drawings for the solution according to the invention.

The invention will now be explained in more detail with reference to an embodiment in conjunction with two figures.

It shows:

Figure 1: the vane pump according to the invention in the side view (without the side cover);

Figure 2: the representation of the cross-sectional profile 13 of the transverse groove 12 according to the invention, according to Figure 1 (in polar coordinates). In the figure 1, the vane pump according to the invention in the

Side view, without cover with a stored in a pump housing 1, by a shaft 2, in this embodiment of the

Crankshaft directly driven rotor 3, with several in bearing grooves 4 of the

Rotor 3 radially displaceably mounted wing plates 5 and a rotor 3 and the wing plates 5 surrounding outer ring 6 shown.

This outer ring 6 is arranged in this embodiment in a rotatably mounted, provided with a control lever 20 lock slider 7.

On one side of the control lever 20 is mounted in the pump housing 1

Compression spring 21 on.

On the opposite side of the actuating lever 20 is a via a

Inflow opening 22 acted upon by the control pressure of the gallery

Control pressure chamber 23 is arranged.

In the pump housing 1, there is furthermore a suction kidney 8 and a pressure kidney 9 which is offset by 180 ° relative thereto.

At the bottom of each cell chamber 10 of the rotor 3 are between the

Bearing grooves 4 of the wing plates 5, over the entire width, i. along the

Lateral surface of the rotor 3 extending, parallel to the bearing grooves 4 of

Wing plates 5 arranged, spaced from the bearing grooves 4 about a bearing web 11 transverse grooves 12.

According to the invention, these transverse grooves 12, as already explained, an asymmetrical cross-sectional profile 13, which in each of

Cell chambers 10 has a trough 14 which is always arranged in the direction of rotation after the cell chamber center axis 15, said Tiefstiefpunkt 14 about 1% to 8% of the outer diameter of the

Rotor 3 below this imaginary, the bearing webs 11 fictitious interconnecting outer diameter of the rotor 3 is located.

It is also characteristic that the asymmetrical cross-sectional profile 13 of the transverse grooves 12 on the rotor 3, as shown in this embodiment, can also be described by a polynomial of the 4th degree. According to the invention underlying this embodiment

Polynomial defined in the range of about - 0.42 radians to + 0.42 radians and is: y = 39, 33695 x ⁴ - 31, 29170 x ³ + 0.4913634 x ² + 5,285977 x + 32,22082.

This functional course, as one of the possible cross-sectional profiles 13 of the transverse groove 12 according to the invention, is shown in FIGS. Limits shown in Figure 2.

The transverse grooves 12 of the cell chambers 10 shown in FIG. 1 also always have this invention shown in FIG

Cross section 13.

In the illustrated in Figure 1 7-leaf vane pump is the

Width of a segment (including the associated

Wing plate sections) 51, 4285 °.

Looking at the rotor shell in a cell chamber 10, it follows immediately adjacent to the cell chamber 10 on both sides limiting

Bearing grooves 4, i. in the area of the bearing webs 11 (in this

Embodiment on both sides over a "width range" of the cell chamber

10% of approx. 5%) of the "original" rotor outside diameter.

The thus formed, immediately adjacent to the bearing grooves 4 of the wing plates 5 arranged bearing webs 11 ensure the required power transmission and rigidity of the rotor 3 even at high stress

Vane pump.

As seen in the direction of rotation follows the "first" bearing bar 11 of the considered

Cell chamber 10 then over about 63% of the width of the cell chamber 10 along the fictitious "original" rotor outer diameter, a second region in which the cross-sectional profile 13 of the transverse groove 12 to a trough 14, in this embodiment to the radius 31, 5 mm, ie to 1.9 mm (2.85% of the original rotor outside diameter of 66.8 mm) drops.

This second sector is followed by the lowest point 14, a third sector in which the cross-sectional profile 13 of the transverse groove 12 increases relatively quickly again and already after about 27% of the width of the cell chamber 10 along the fictitious Rotor outer diameter reaches the original outer diameter of the rotor 3 again.

As already explained then the course of the original

Outer diameter of the rotor 3 as a second bearing bar 11, in this

Embodiment over a range of the cell chamber 10 of about 5% along the original outer diameter of the rotor 3 to the storage groove

4 retained.

By means of this inventive, asymmetrical design of the

Cross-sectional profile 13 of the transverse groove 12 is surprisingly always guaranteed a low-friction and fluidically optimal complete filling of the pump chambers in vane pumps.

In particular, by the inventive solution even at the previously very critical speeds in the range of 4,500 rev / min to even over 6,000

U / min easily optimal full filling of the cell chambers 10 as well as an optimal fast and low-friction emptying of the

Cell chambers 10 are ensured.

In addition, the transverse grooves 12 according to the invention are also easy to manufacture.

The vane pumps with the inventive, asymmetrical

Cross grooves are distinguished from the designs of the prior

Technology even by a quieter running even at very high

Speeds off.

As already explained, it was found in the test series carried out with the solution according to the invention that by means of the present invention

Solution also significantly reduced the wear of vane pumps and the

Power losses could be minimized.

In summary, it can also be stated that by means of the solution according to the invention with high reliability and a long service life a high specific delivery volume flow with high efficiency both at low, but especially at high speeds, ie Range from 4,500 rpm to over 6,000 rpm.

In the embodiment shown in Figure 1 is in the rotor 3 a

Guide ring 19 fitted on the "inside" end faces 16 of

Wing plates 5 is applied, which in turn with their "outside"

End faces 16 abut the outer ring 6.

It is characteristic that the wing plates 5 of the invention

Vane pump are rounded at their ends 16.

In the present embodiment corresponds to the front sides 16 of the

Wing plates 5 arranged radius half the distance between the

End faces 16 of the wing plates 5.

This will in addition to an optimal and low-friction and wear

Sealing the cell chamber on the outer ring 6, at the same time ensures optimal, friction and low-wear guide on the guide ring 19 during the entire circulation of the shaft 2.

It is also according to the invention that 5 lubrication pockets 18 are arranged in the walls 17 of the bearing grooves 4 of the wing plates arranged in the rotor 3, which clearly minimize the wear between the wing plates 5 and the bearing grooves 4.

The control pressure chamber 23 shown in connection with the solution according to the invention in the figure 1 is on both sides of each of a sealing strip

24 sealed, wherein the sealing strips 24 are slidably mounted in each associated and pressurized by the control pressure of the gallery Führungsungskammernuten 25.

It is advantageous in this context that in the Führungskammernuten

25 (below the sealing strips 24) resilient elements, e.g. As shown in Figure 1, leaf springs 27 are arranged, which ensure that the sealing strips 24 are still pressed against the pump housing 1 when the vane pump (the motor) is stopped / stopped. According to the invention, the guide chamber grooves 25 are via connecting channels

26 connected to the control pressure chamber 23, so that they are safe from the can be acted upon via the inflow opening 22 incoming control pressure of the gallery, and thus ensure a highly reliable and very secure sealing of the control pressure chamber 23 by means of the sealing strips 24 with minimal space under extreme conditions.

REFERENCE SYMBOL

1 pump housing

2 wave

3 rotor

4 storage grooves

5 wing plates

6 outer ring

7 control slide

8 suckling kidneys

9 print kidneys

10 cell chamber

11 storage bridge

12 transverse grooves

13 Cross section

14 low point

15 cell chamber center axis

16 front side

17 wall

18 lubrication pocket

19 guide ring

20 levers

21 compression spring inflow

Control pressure chamber

sealing strip

Führungskammernuten

connecting channel

leaf spring

Claims

claims 1. vane pump with a in a pump housing (1) mounted by a shaft (2) driven rotor (3), a plurality of bearing grooves (4) of the rotor (3) mounted wing plates (5) and a rotor (3) and the Wing plate (5) surrounding the outer ring (6) with a arranged in a pump housing (1) suction kidney (8) and offset by 180 ° in the pump housing (1) arranged pressure kidney (9), with at the bottom of each cell chamber (10 ), ie in the cylindrical surface of the rotor (3), between the bearing grooves (4) over the entire rotor width, parallel to the bearing grooves (4) of the wing plates (5) arranged by the bearing grooves (4) about a bearing web (11) spaced transverse grooves ( 12), characterized in that these transverse grooves (12) have an asymmetrical cross-sectional profile (13) which in each cell chamber (10) has a trough (14) which is always arranged in the direction of rotation after the cell chamber center axis (15). 2. vane pump according to claim 1, characterized in that the lowest point (14) about 1% to 8% of the outer diameter below an imaginary the bearing webs (11) interconnecting outer diameter of the rotor (3). 3. vane pump according to claim 1, characterized in that the asymmetrical cross-sectional profile (13) of the transverse grooves (12) on the rotor (3) can be described by a polynomial degree 4th 4. Vane pump according to claim 3, characterized in that the polynomial are: y = 39, 33695 x ^4-31, 29170 x ³ + X ² + 5.285977 0.4913634 x + 32.22082 and (in the range within the limits ) from about - 0.42 rads to + 0.42 rads (defined). 5. vane pump according to claim 1, characterized in that the wing plates (5) at their end faces (16) rounded, i. are executed crowned. 6. vane pump according to claim 5, characterized in that wing plates (5) at their end faces (16) are provided with radii. 7. vane pump according to claim 6, characterized in that at the end faces (16) of the wing plates (5) arranged radius corresponds to half the distance between the end faces (16). 8. vane pump according to claim 1, characterized in that in the walls (17) in the rotor (3) arranged bearing grooves (4) of the wing plates (5) are arranged lubrication pockets (18). 9. vane pump according to claim 1, characterized in that the outer ring (6) in a rotatably mounted, with a control lever (20) provided with adjusting slide (7) is arranged, wherein on one side of the actuating lever (20) in the pump housing (1) mounted pressure spring (21) is applied, and on the opposite side of the actuating lever (20) via a feed opening (22) acted upon by the control pressure of the gallery control pressure chamber (23) is arranged. 10. vane pump according to claim 9, characterized in that the control pressure chamber (23) is sealed on both sides by a respective sealing strip (24) which are themselves slidably mounted in each associated with pressurized Führungsungskammernuten (25). 11. vane pump according to claim 10, characterized in that the guide chamber grooves (25) via connection channels (26) with the control pressure chamber (23) are connected. 12. vane pump according to claim 10, characterized in that in the guide chamber grooves (25) below the sealing strips (24) leaf springs (27) are arranged.