DE102008054009B4 - Vane pump - Google Patents

Abstract

Vane pump (10) in a machine housing (1) with a fluid inflow (6) and a fluid outflow (7) arranged largely diametrically to the fluid inflow (6) and with a fluid outflow (7) arranged in the machine housing (1) so as to be rotatable about a first axis of rotation (8) , largely tubular cage (2) and with a rotor (5) which is arranged in an interior of the cage (2) and rotatable about a second axis of rotation (9) parallel to the first axis of rotation (8), the cage (2) and the Rotor (5) via at least four vanes (3) which are pivotably mounted on the one hand coaxially to the axes of rotation (8, 9) and, on the other hand, in grooves (11) extending in the direction of the axes of rotation (8, 9) and corresponding to the vanes (3) ) are in operative connection with one another in such a way that when the rotor (5) rotates, the cage (2) can also rotate, whereby a fluid can be conveyed from the fluid inlet (6) to the fluid outlet (7) through the rotation, characterized in that the blades ( 3) at least in the area that goes into the grooves (11) protrudes, have a smaller thickness than a clear width of the grooves (11), the clear width of the grooves (11) decreasing radially inward and each wing (3) having a single line contact with the corresponding groove (11) and the wings (3) can be pressed by spring elements (4) against the direction of rotation against the line contact and wherein the wings (3) are pivotably mounted in the cage (2) and the spring elements (4) are arranged in the area of the pivotable bearings.

Description

The invention relates to a vane pump with the features of the preamble of claim 1.

It is based on the German utility model DE 295 14 202 U1 out. From this document, a usable as a pump or hydraulic motor, adjustable pendulum pusher or vane pump is known. The vane pump according to the prior art has a machine housing with a fluid inlet and a fluid drain arranged substantially diametrically to the fluid inlet. In the machine housing a, about a first axis of rotation rotatably arranged, largely tubular cage is arranged. In the interior of the cage turn around a second, to the first axis of rotation arranged in parallel rotary axis rotatable rotor is arranged. The cage and the rotor are operatively connected to each other via eight pivotally mounted wings, such that upon rotation of the rotor about its axis of rotation, the tubular cage is likewise rotated over the wings. For this purpose, the wings are rotatably mounted in the tubular cage, while at the other end they are guided in grooves of the rotor. By moving the two axes of rotation to each other, the flow rate of a conveying fluid, for. As a lubricant, which is funded by the fluid inlet to the fluid drain, can be varied.

A disadvantage of the known construction is a relatively high internal friction of the vane pump, due to manufacturing tolerances. Further, the vane pump has a high internal pumping resistance at high speed and high sensitivity to contamination. Furthermore, cavitation occurs due to rapid volume changes, which causes the lubricant to age quickly.

Object of the present invention is the o. G. To avoid disadvantages.

This object is solved by the features in the characterizing part of patent claim 1.

Due to the inventive design, the internal friction is reduced by minimizing the rubbing surfaces and sliding speeds, since only a line contact between the friction partners exists by the inventive design. At the same time, the internal pumping resistances are reduced by reducing the working stroke of the vanes in the rotor. Advantageously, no fit for the wings in the rotor is necessary, whereby the vane pump according to the invention is largely insensitive to dirt. In addition, the volumes of the secondary chambers (formed by the grooves and the wings) are advantageously reduced by the arrangement and the shape of the wings, whereby a rotational irregularity of the vane pump is significantly reduced. In addition, advantageously, the radial stroke of the wings is reduced by the superposition with a tangential movement. As a result, the rotor can be made much more stable with the same size of the vane pump.

With the embodiment according to claim 2, the flow rate of the vane pump can be varied.

In the following, the vane pump according to the invention is explained in more detail with reference to a particularly preferred embodiment in two figures.

1 shows a section through an inventively designed vane pump.

2 shows a detailed view 1 ,

1 shows a section through an inventively designed vane pump 10 , In a machine housing 1 is a tubular, in the machine housing 1 around a first axis of rotation 8th rotatably mounted cage 2 arranged. In an unnumbered interior volume of the cage 2 is a about a second axis of rotation 9 rotatably mounted rotor 5 arranged. The Ka 2 and the rotor 5 For example, in the present embodiment, there are six wings 3 , where only one wing is numbered, in operative connection with each other. For this are the wings 3 parallel to the axes of rotation 8th . 9 swiveling in the cage 2 while at the other end they are in grooves 11 in the rotor 5 are stored. In the area of the pivotable bearing in the rotor 5 become the wings 3 of spring elements 4 against a direction of rotation of the rotor symbolically represented by an arrow 5 against a side wall of the groove 11 pressed. When operating the vane pump 10 becomes the rotatable rotor 5 driven, causing the cage 2 over the wings 3 is turned. In this case, a fluid from a fluid flow shown in dashed lines 6 to a likewise shown in dashed lines fluid drain 7 promoted. By changing the distance of the first axis of rotation 8th to the second axis of rotation 9 , substantially perpendicular to a connecting line from the fluid inlet 6 to the fluid drain 7 , a fluid delivery rate is changeable.

According to the invention, the wings 3 at least in the area that is in the grooves 11 protrudes, a smaller thickness than a clear width of the grooves 11 is, each wing 3 a single line contact with the corresponding groove 11 has and the wings 3 of spring elements 4 against a direction of rotation against the line contact can be pressed.

The vane pump according to the invention 10 may for example be made of a plastic such as ABS (Acrylbuthadienstyrol) or a metal, such as a light metal, such as aluminum or composite materials. The vane pump according to the invention 10 For example, it can be used as a lubricant pump for an internal combustion engine.

The inventive design, the internal friction is reduced by minimizing the rubbing surfaces (only line contact) and sliding speeds. Further, the internal pumping resistance by reducing the working stroke of the wings 3 in the rotor 2 minimized. In addition, advantageously no fit of the wings 3 in the rotor 2 necessary, whereby the vane pump according to the invention 10 Insensitive to dirt. In addition, the volumes of the secondary chambers are determined by the arrangement and shape of the wings 3 reduced, whereby a reduction in rotational nonuniformity is achieved. Next is the radial stroke of the wings 3 reduced by superposition of a tangential movement. This allows the rotor 2 , with the same size of the vane pump 10 , be made more stable.

The basic operating principle of the vane pump according to the invention 10 with one-sided wing system with line contact corresponds to the previously known prior art. The innovation lies in the over a wider range of a circulation one-sided investment of the wing 3 in a groove 11 in the rotor 2 , It slides or rolls the wing 3 in the groove 11 of the rotor 2 from. So that the rotor 5 the rotary motion on the cage 2 , about the wings rotatably anchored therein 3 is a coordinated shape of wings 3 and groove 11 in the rotor 5 required. The shape of the wings 3 and the grooves 11 influence each other. In addition, the shape of the wings 3 and the grooves 11 from the eccentricity (rotor 5 , Cage 2 ) and the angle of attack of the wing 3 in the cage 2 affected. For a continuous power transmission is possible, the groove 11 be shaped so that the degree of freedom of the wing 3 is limited over a range of one revolution (360 ° divided by the number of blades) so far that the force can be transmitted via positive engagement.

2 shows a detail view of a grand piano 3 with a spring element 4 out 1 ,

• – Verringerung der inneren Reibung, weniger Verschleiß;
• – Innerer Pumpwiderstand wird reduziert;
• – Unempfindlichkeit gegen Schmutz;
• – Geringere Anfälligkeit gegen Kavitation;
• – Geringere innere Verschäumung des Fluids.

Again the advantages of the vane pump according to the invention 10 in keywords:

• - Reduction of internal friction, less wear;
• - Internal pumping resistance is reduced;
• - insensitivity to dirt;
• - Less susceptibility to cavitation;
• - Lower internal foaming of the fluid.

LIST OF REFERENCE NUMBERS

1

machine housing

2

Cage

3

wing

4

spring element

5

rotor

6

fluid inflow

7

fluid outflow

8th

first axis of rotation

9

second axis of rotation

10

Vane pump

11

groove

Claims (2)

Vane pump ( 10 ) in a machine housing ( 1 ) with a fluid inflow ( 6 ) and a largely diametrically to the fluid flow ( 6 ) arranged fluid outflow ( 7 ) and with one, in the machine housing ( 1 ) about a first axis of rotation ( 8th ) rotatably arranged, largely tubular cage ( 2 ) and with one, in an interior of the cage ( 2 ), to a second, to the first axis of rotation ( 8th ) parallel axis of rotation ( 9 ) rotatable rotor ( 5 ), with the cage ( 2 ) and the rotor ( 5 ) over at least four, on the one hand coaxial with the axes of rotation ( 8th . 9 ) pivotally mounted and on the other hand in the direction of the axes of rotation ( 8th . 9 ), to the wings ( 3 ) corresponding grooves ( 11 ) guided wings ( 3 ) are in operative connection with one another in such a way that upon rotation of the rotor ( 5 ) the cage ( 2 ) is rotatable, wherein the rotation of a fluid from the fluid inlet ( 6 ) to the fluid drain ( 7 ), characterized in that the wings ( 3 ) at least in the region that enters the grooves ( 11 ) protrudes, have a smaller thickness than a clear width of the grooves ( 11 ), wherein the clear width of the grooves ( 11 ) decreases radially inwardly and wherein each wing ( 3 ) a single line contact with the corresponding groove ( 11 ) and the wings ( 3 ) of spring elements ( 4 ) are pressed against a direction of rotation against the line contact and wherein the wings ( 3 ) in the cage ( 2 ) are pivotally mounted and the spring elements ( 4 ) are arranged in the region of the pivotable bearings. Vane pump according to claim 1, characterized in that the second axis of rotation ( 9 ) of the rotor ( 5 ) to the first axis of rotation ( 8th ) of the cage ( 2 ) largely transverse to a connecting line from the fluid inflow ( 6 ) to the fluid drain ( 7 ) is displaceable in parallel.

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