DE10027811A1 - Cellular pump with housing and pressure plates uses distance piece between pressure plate and chamber ring surfaces plus seal round between pressure-side plate and housing. - Google Patents

Abstract

A distance piece (19) runs round between the surfaces of the pump chamber ring (6) and the pressure plate (10) and the radial dimension of the chamber ring is smaller than that of the specified pressure plate (10). The distance piece can be of one piece with the chamber ring and/or the pressure plate. A seal (17) runs round between the sidewalls of the housing recess (3) and the pressure plate (10) and the pressure space (12) lies between the bottom of the recess (3) and the pressure plate (10).

Description

The invention relates to a pump with a housing se, which has a recess in which a pump Pen unit is arranged, one of a pump pen chamber ring and at least one on the pumps Pumps formed by the ring-shaped pressure plate chamber and a rotatable pump element be sits, which is arranged in the pump chamber, and with one of the recess and the pressure plate limited pressure space.

Pumps of the type mentioned are known. Around the bending of the pressure plate on the pressure chamber side to counteract, one has in the prior art se pressure plate is particularly rigid. This known printing plate thus has a relatively large Material thickness on, which reduces the size of the pump increases accordingly. So far, however, this has been the case accepted the difference between the pressure room side Pressure plate and the pump element lying Lecka to keep the gap as small as possible and around one sufficient volumetric efficiency of the pump to obtain.

From DE 199 00 927 A1 it is also known that pressure plate on the pressure chamber side opposite the floor the recess provided in the housing with a To support distance means. For the rest, the Re reducing the leakage gap between the floor  the recess associated with the pressure plate and Pump element the entire pump unit in axial Floating in the direction.

It is therefore an object of the invention to provide a pump Specify the type mentioned above, which simply on is built and still a good volumetric Has efficiency.

This task is solved with a pump, the one Includes housing formed in a recess is. A pump unit is attached in the recess assigns the one from a pump chamber ring and to at least one lying on the pump chamber ring Pressure plate formed pump chamber and a dre drivable pump element has. This is in arranged the pump chamber. In addition, the Pump one of the recess and one of the pressure limited pressure space. According to the invention The pump is characterized by the fact that between the contact surfaces of the pump chamber ring and the pressure plate on the pressure chamber side a circumferential distance medium lies. By charging the Side surface of the pressure plate facing the pressure chamber a force acts on the one hand with the medium pressure the elliptical or circular area of the pressure chamber Pressure plate, the through opening of the pump chamber rings is directly opposite; on the other hand a force acts on the medium pressure pressure area-side ring surface of the pressure plate, see above that a counterforce is built up that the through bend the pressure plate in the area of the circular area counteracts. Thus, in the invention pump deflection of the pressure plate  least decreased so that once set Leakage gap also in operation, i.e. under pressure, Temperature etc., the pump essentially unchanged remains, which corresponds to this leakage gap appropriately narrow or narrow can, so the volumetric efficiency of the Pump is improved. Because the deflection of the Printing plate is largely compensated, this must Pressure plate should not be particularly strong, which reduces the axial length of the pump can be.

This task is also solved with a pump who invented instead of the circumferential distance means is provided according to the radial extension of the pump chamber ring is smaller than the radial one Extension of the pressure plate on the pressure chamber side choose. Thus the pressure plate is above the outside circumferential surface of the pump chamber ring so that again - as mentioned above - the radially outside lying ring surface of the pressure plate with a force is subjected to the deflection of the pressure plate in the area of the through opening ent over lying circular area of the pressure plate counteracts. Thus, this is also fiction according to the designed pump the volumetric we Degree of efficiency improved because of a very low leakage gap can be selected.

To the pressure chamber compared to the rest of the recess Sealing area is between the side wall the recess in the housing and the pressure chamber side Pressure plate arranged a circumferential seal, thus between the side wall of the recess and  the edge surface of the printing plate. This will but also ensured that the behind the Pressure plate lying cavity between the pump chamber ring and pressure plate ring surface not with the Medium pressure is applied.

A particularly preferred embodiment is characterized in that the distance means in one piece with the pump chamber ring and / or the pressure plate side pressure plate is formed. Through appropriate manufacturing processes, for example wise machining processes, this can distance medium light one-piece with the pump chamber ring or the printing plate. The pump according to the invention is thus distinguished through an inexpensive manufacture, whereby nevertheless the volumetric efficiency improves is.

In one embodiment, the pressure space is located between the pressure plate on the pressure chamber side and the Bottom of the recess.

The invention is based on Ausfüh approximately examples with reference to the drawing explained. Show it:

Fig. 1 shows a first embodiment of a pump,

Fig. 2 shows a second embodiment of a pump,

Fig. 3 schematically shows the inventive support of the pressure chamber side pressure plate of a pump, and

Fig. 4 shows a third embodiment of a pump.

The pump described below can be used as a fluid gel cell, vane and roller cell pumps be formed, in which the rotationally driven pump penelement is formed by a rotor in which - Depending on the type of pump - blades or rollers used are or the - when designing a block vane pump - realized as a contour element.

However, it would also be conceivable to use the pump as a gear train the pump. Such pumps, respectively their function are known per se, so that in The exact design of the rotary drive follows ble pump element is not described in detail.

Fig. 1 shows a greatly simplified and only partially shown a pump 1 in cross section, which comprises a housing 2 . In this housing 2 , a recess 3 is made , which - not shown here represents - is closed by a housing cover which can be fastened to the housing 2 of the pump 1 .

In the recess 3 , a pump unit 4 is arranged, which has a pump chamber 5 , the plates 9 and 10 is limited by a pump chamber ring 6 and two on the ring-shaped bearing surfaces 7 and 8 lying pressure plates. Instead of the pressure plate 9 , the housing 2 can also be designed so that it limits the pump chamber 5 . At least the pressure plate 10 is provided, however. One of the pressure plates 10 is located at a distance from the bottom 11 of the substantially circular-cylindrical Ausneh mung. 3 This pressure plate 10 thus forms with the recess 3 a pressure chamber 12 into which the medium conveyed by egg nem driven pump element 13 is introduced. The pressure chamber 12 has a connection (not shown here) to a pump-side consumer connection (not shown). The pump element 13, which can be driven in rotation, is the above-mentioned rotor ei ner vane, barrier vane or roller cells pump or a gear of a gear pump. In order to be able to drive the pump element 13 in a rotational manner, this is arranged on one end 14 of a drive shaft 15 rotatably mounted in the housing 2 in a rotationally fixed manner. At the other end, not shown here, a drive torque can be conducted.

The drive shaft 15 passes through the pressure chamber 12 and passes through an opening 16 , preferably centrally, formed in the pressure plate 10 . Inside half of the opening 16 , a circumferential sealing element 17 is arranged. The seal is achieved via a sealing gap. Between the circumferential surface of the drive shaft 15 and the drive shaft opening 18 formed in the housing 2 , a sealing element is preferably also arranged in order to seal the pressure chamber 12 to the outside, like the sealing element 17 . This sealing element can be designed as a radial shaft sealing ring 16 '.

A circumferential spacer 19 is arranged between the support surface 7 present on the pump chamber ring 6 and the support surface 18 'of the pressure chamber-side pressure plate 10 , which is formed in one piece with the pump chamber ring 6 in the present exemplary embodiment according to FIG. 1. For this purpose, the pump is in the end face 7 'of chamber rings introduced 6 is a preferably open at the edge, radially outer circumferential groove 20 so that between the pressure plate 10 and the Pumpenkam Merring 6 at least partially a cavity 21 is formed. The spacer means 19 is arranged on the pump chamber ring 6 that it penkammerring 6 facing platen surface 22 in two partial areas divided corresponding to the Pum, namely the lie facing breakthrough 23 of the pump chamber ring 6 the Druckplattenkreis- or -ellipsenfläche 24 and the radially outer pressure plate annular surface 24 '. The pressure plate circle or ellipse surface 24 is therefore in the circular or elliptical area 24 ″, whereas the pressure plate ring surface 24 ′ is in the ring area 24 ″ ″ of the pressure plate 10. The spacer 19 is spaced from the side wall 25 of the recess 3 . A pressure plate elliptical surface is obtained when the opening 23 is essentially elliptical, in which case the pump element 13 preferably has an axis of rotation in which the center point of the ellipse lies, but the opening 23 can also be circular in cross section, in which case the pump element ment an axis of rotation has, offset to with focus of tremendous breakthrough 23 is located. from Fig. 1 is still seen that and the peripheral surface of the pressure plate 10, a circumferential seal 27 is arranged between the side wall 25 26 which lie preferably in an annular groove 28 comes, which is introduced into the border area 26 in the exemplary embodiment shown it al lerdings also to arrange the seal 27 in a Ge in the housing 2 to be formed annular groove, which would be formed with in the side wall 25 of the recess 3 .

Fig. 2 shows a second embodiment of a pump 1. The same parts or the same effect are provided in the fragmentary illustrated pump 1 of FIG. 2 with the same reference numerals as in Fig. 1. Therefore, the following only the differences between the pump 1 of FIG. 1 and FIG. 2 received. The distance means 19 is formed in the pump 1 according to FIG. 2 in one piece with the pressure plate 10 on the pressure chamber side and thus forms an elevation on the pressure plate surface 22 . For this purpose, it is provided that an annular groove 29 , which is preferably open at the edge and is located radially on the outside, is introduced into this pressure plate surface 22 in the ring region 24 ″ ″, so that the spacer 19 - seen in plan view - is designed as a flat circular disk. The spacer 19 can also be present as a separate insert, which then comes to rest between the pressure plate 10 and the pump chamber 6 .

Fig. 4 shows a third embodiment of a pump 1. As in FIGS. 1 and 2, parts that are the same or have the same function are given the same reference numerals in FIG. 4, so that reference can be made to their description in this respect. In contrast to the exemplary embodiments according to FIGS. 1 and 2, the pump chamber ring 6 is not supported on the side wall 25 of the recess 3 . Rather, it is held centered on the pressure plate 9 . For this purpose, connecting elements 31 or centering pins can be provided, which can be designed as connecting bolts. This Ver connecting elements 31 can be seen both between the pump chamber ring 6 and the pressure plate 9 and - in the form that deflection of the pressure plate 10 is not hindered - can also be seen between the pump chamber ring 6 and the pressure chamber side pressure plate 10 . Such connecting elements 31 may be even with the pump 1 of FIG. 1 and FIG. 2 ver turns are.

The radial extent, in particular the outer diameter A of the pump chamber ring 6 , is thus smaller in the exemplary embodiment of the pump 1 according to FIG. 4 than the radial extent, that is to say, for example, the outer diameter B of the pressure plate-side pressure plate 10 .

The effect of the spacer 19 according to the invention and the support of the pressure plate 10 according to FIG. 4 are described in more detail below with reference to FIG. 3. In Fig. 3 the pump 1 is further simplified and shown only schematically. The same or equivalent parts as in Figs. 1, 2 and 4 are provided with the same reference characters. During operation of the pump 1 , the medium conveyed via the pump element 13 is present in the pressure chamber 12 at a pressure p. As a result, 32 forces K act on the pressure plate outer surface facing the base 11 and urge the pressure plate 10 in its circular region 24 "facing the opening 23 of the pump chamber ring 6 in the direction of the pump element 13 which can be driven in rotation. Radially outside, ie in the ring region 24 ''' the pressure plate surface 32 , forces K 'act with the same direction of action as the forces K, but these cause a counter-deflection of the pressure plate 10 within the circular area 24 "in the pressure plate 10 , so that the formation of the abdomen of the pressure plate 10 in the direction of the pump element 13 is reduced becomes. The radially outward lying after the spacer 19 ring portion 24 '''of the pressure plate 10 is, however, ge in the cavity 21 urges. The deflections caused by the forces K and K 'overlap, so that the resultant deflection of the pressure plate 10 is at least reduced.

The formation of a belly by deflection of the pressure plate in the circular area occurs in known pumps in that areas with different medium pressures are present within the pump chamber, since at least one pressure and suction area are formed within the pump chamber 5 , in which there are therefore different medium pressures, so that forces acting on the pressure plate surface in the circular area cannot be compensated solely by the forces resulting from the medium pressures.

Because the spacer 19 according to the invention is provided in the pump 1, the pressure forces K "acting on the pressure plate surface 22 from the pump chamber 5 are supported by the forces K 'acting on the pressure plate ring surface 24 ', so that one for the respective one Undesired deflection of the pressure plate 10 is avoided.This means that the leakage gap between the pressure plate circular area 24 and the pump element 13 is essentially not changed during operation of the pump 1, and can therefore be designed very narrowly, which reduces the volumetric efficiency of the pump 1 improved.

The belly formation of the pressure plate 10 would thus be a result of the asymmetrical pressurization on the pressure plate circular surface 24 with the forces K ″ and on the surface area of the pressure plate 10 facing the floor 11 , on which the forces K act, without the spacing means 19 .

By acting as a rocking edge 33 for the pressure plate 10 lying on the spacer 19, or by - as shown in Fig. 4 - the smaller radial extension A of the pump chamber ring 6 compared to the radial extension B of the pressure plate 10 , however, a counter-bending moment is generated, which counteracts the bending moment generated by the application of force K. This Gegenbiegemo element produces a deformation that counteracts the bending deformation resulting from the compressive force K on the ra dial inner circular region 24 "of the pressure plate 10 and thus supports the forces acting from the pump chamber 5 forces K". Overall, a reduction in the deflection of the pressure plate 10 is associated with the provision of the rocking edge 33 . It is clear that the choice of the outer diameter A ( FIG. 4) of the pump chamber ring 6 allows the lever arm 34 ( FIG. 3) lying between the side wall 25 and the rocking edge 33 on the pressure plate 10 to be varied in its length L by the counter-bending moment to change, in particular to adapt to pressure conditions in the pressure chamber 12 and in the pump chamber 5 . Is the pump chamber ring 6 with its outer peripheral surface on the Seitenwan extension 25 , as shown in FIGS. 1 and 2, the length L of the lever arm 34 on the Druckplat te 10 can be adjusted by a corresponding distance of the disancing means 19 from the side wall 25 .

The claims filed with the application are wording suggestions without prejudice outgoing patent protection. The applicant reserves the right before, more, so far only in the description and / or combination of features disclosed in the drawings to claim nations.

Back relationships used in subclaims sen on the further training of the subject of Main claim through the characteristics of each Subclaim; they are not as a ver refrains from achieving an independent, against constant protection for the combinations of features to understand the related subclaims.

Since the subjects of the subclaims with regard own state of the art on the priority day and can form independent inventions the notifying party pretends to be independent of the subject pending claims or declaration of division to ma chen. You can also continue to work independently containing one of the items of the  previous dependent claims independent form tion.

The exemplary embodiments are not restricted to understand the invention. Rather, in Numerous Ab Changes and modifications possible, in particular such variants, elements and combinations and / or materials, for example by combination nation or variation of individual, in connection with those in the general description and execution tion forms and the claims described and features included in the drawings elements or procedural steps for the specialist with a view to solving the problem are removable and due to combinable features a new subject or new procedure steps or sequence of steps lead, also insofar as they manufacture, test and work concern proceedings.

Claims (6)

1. Pump with a housing which has a recess in which a pump unit is arranged which has a pump chamber formed by a pump chamber ring and at least one pressure plate lying on the pump chamber ring and has a rotatably drivable pump element which is arranged in the pump chamber, and with a pressure chamber delimited by the recess and the pressure plate, characterized in that a circumferential spacer is located between the bearing surfaces of the pump chamber ring and the pressure chamber-side pressure plate. 2. Pump with a housing that has a recess has, in which a pump unit is arranged, the one from a pump chamber ring and at least a pressure plate lying on the pump chamber ring te formed pump chamber and a rotatable Pump element owns that in the pump chamber is ordered, and with one of the recess and the pressure plate limited pressure space, thereby ge indicates that the radial extension of the pump penkammerrings is smaller than the radial extent cover of the pressure plate on the pressure chamber side. 3. Pump, in particular according to claim 1 or 2, because characterized by that between the sidewall the recess in the housing and the pressure chamber  side pressure plate a circumferential seal lies. 4. Pump, in particular according to claim 1 or 3, because characterized by that the distance means in one piece with the pump chamber ring and / or the pressure plate side pressure plate is formed. 5. Pump, in particular according to claim 1 or 2, because characterized in that the pressure space between the bottom of the recess and the pressure chamber side Pressure plate lies. 6. Pump with a housing that has a recess has, in which a pump unit is arranged, the one from a pump chamber ring and at least a pressure plate lying on the pump chamber ring te formed pump chamber and a rotatable Pump element owns that in the pump chamber is ordered, and with one of the recess and the pressure plate limited pressure space, marked net by at least one in the registration documents disclosed inventive feature.