WO2019238351A1

WO2019238351A1 - Pump device and method for at least locally sealing the pump device

Info

Publication number: WO2019238351A1
Application number: PCT/EP2019/062583
Authority: WO
Inventors: Andreas Kuhlmey; Gerhard Kuhnert; Hassan Ghodsi-Khameneh; Mario STAIGER; Daniel Hauer
Original assignee: Ebm-Papst St. Georgen Gmbh & Co. Kg
Priority date: 2018-06-15
Filing date: 2019-05-16
Publication date: 2019-12-19
Also published as: DE102018114455A1; CN111868351B; CN111868351A; US20210324843A1; CN208845350U; EP3735516A1

Abstract

The invention relates to a pump device for pumping a liquid, comprising a hydraulic housing (2), a pump ring support (5) which is arranged in the hydraulic housing (2), an elastic pump ring (3) which is arranged between the pump ring support (5) and the hydraulic housing (2) in the radial direction (RR), and a separating chamber pin (4). The pump ring (3) can be pressed in the radial direction (RR) against an inner wall surface of the hydraulic housing (2) by means of the separating chamber pin (4) in order to produce an at least local seal on the hydraulic housing (2), and the hydraulic housing (2) has a radial offset section (6), along which an offset element that is formed on the separating chamber pin (4) or a separate offset element that interacts with the separating chamber pin can be introduced in the axial direction (AR) and thus offsets the separating chamber pin (4) and the pump ring (3) in the radial direction.

Description

Pump device and method for at least locally sealing the pump device

Description:

The invention relates to a pump device and a method for at least locally sealing the pump device, in particular on an inner wall surface of the hydraulic housing, using a separating chamber pin. Generic pump devices are well known from the prior art. For example, the publication WO 2016/173800 A1, which goes back to the applicant, discloses a corresponding pump device for pumping or conveying liquids with a hydraulic housing, a pump ring carrier and a pump ring which is operated by means of a separating chamber pins, also referred to as “clamping members”, to separate pump chambers from one another or a suction side from a pressure side of the pump. The pump ring is sometimes referred to in the trade as the "membrane". The separating chamber pin is pressed axially into the elastic pump ring during assembly and, with its free front edge, shifts the pump ring both in the axial and in the radial direction, the radial offset creating a seal on the inner wall surface of the hydraulic housing. The problem here is that the axial insertion or displacement of the separating chamber pin also exerts axial loads on the pump ring, which can damage it or lead to an uneven tension ratio within the pump ring. The tightness is then not ensured, or at least not over the life of the pump device.

The invention is therefore based on the object to provide a pump device in which the sealing of the pump ring on the Hydraulikge housing can take place, the acting on the pump ring on Monday the axial forces are eliminated or at least reduced.

This object is achieved by the combination of features according to claim 1. According to the invention, a pump device for pumping a liquid is proposed which comprises a hydraulic housing, a pump ring carrier arranged in the hydraulic housing and an elastic pump ring arranged in the radial direction between the pump ring carrier and the hydraulic housing and a separation chamber pin. The pump ring can be pressed in the radial direction against an inner wall surface of the hydraulic housing in order to produce an at least local seal on the hydraulic housing by the separating chamber pin in order to close the pump chambers of the pump device. separation from each other. The hydraulic housing has a radial offset section, along which a displacement element formed on the separation chamber pin or separately interacting with the separation chamber pin can be inserted in the axial direction and thus the

Separation chamber pin and the pump ring offset in the radial direction to produce a radial compression of the elastic pump ring on the Hydraulikge housing.

The provision of the radial offset section provided on the hydraulic housing and of the offset element acting on the separation chamber pin makes it possible for the separation chamber pin to initially be able to be passed completely or essentially completely through the pump ring without exerting any significant axial force on the pump ring. The pressing of the pump ring against the hydraulic housing in the radial direction can advantageously be brought about by the offset element which interacts with the radial offset section after the separating chamber pin extends over the pump ring in the axial direction. The axial force previously exerted on the pump ring when inserting the separation chamber pin, which led to an undesired local movement of the pump ring in the axial direction, can be avoided. In a favorable embodiment variant, the offset element is formed in one piece on the separating chamber pin, in particular on its axial edge section, and displaces the separating chamber pin in the radial direction as soon as it interacts with the radial offset section. The interaction can be achieved, for example, by pushing the offset element in the axial direction over the radial offset section and thereby displacing the separation chamber pin in the radial direction. The one-piece design means that additional components are not required. Furthermore, an embodiment of the pump device is characterized in that a radially outer insertion plane of a lateral surface of the separating chamber pin runs in the radial direction without overlap in a pre-assembled state of the separating chamber pin in a pre-assembled state of the separating chamber pin. As a result, the separation chamber pin can be guided past the pump ring in the axial direction without touching it, or at least without exerting an axial force on it. The insertion level and the pump ring level can also coincide. The pre-assembly state is the state in which the separation chamber pin is inserted into the elastic pump ring but does not yet exert any radial compression on the pump ring.

In addition, an embodiment of the pump device is favorable in which the separating chamber pin can be displaced in the radial direction in a state that completely extends the pump ring in the axial direction, in order to simultaneously press the elastic pump ring over its entire effective axial length against the inner wall surface of the hydraulic housing. The

For this purpose, the separation chamber pin has a sufficient axial length so that it is first passed completely through the pump ring in the axial direction and only then is it moved as a whole in the radial direction. This means that no axial forces act on the pump ring during insertion of the separation chamber pin, which could damage it.

In an embodiment variant of the pump device, it is provided that the radial offset section of the hydraulic housing is designed as a radial step. In particular, the radial step is provided on an axial insertion section of the hydraulic housing for the separation chamber pin, so that the separation chamber pin can interact with the radial step in the axial outer region, ie axially spaced apart from the pump ring, in order to bring about the radial offset of the separation chamber pin and pump ring. In a further development, the pump device is characterized in that the radial step and the Ver set element formed on the separating chamber pin have a corresponding run-up slope over which the separating chamber pin can be pushed in the axial direction in order to simultaneously generate the radial offset of the separating chamber pin and the pump ring. The separating chamber pin can thus be inserted axially into the pump ring as before, while the run-on bevels of the radial step and the offset element provide a guide for the separating chamber pin, which automatically moves it radially when fully inserted into the final assembly position.

Furthermore, an exemplary embodiment of the pump device provides that the fly hydraulic housing on a side axially opposite the radial offset section to the pump ring carrier has a receptacle for the

Separation chamber pin forms. The receptacle has an insertion ramp which runs obliquely in the radial direction, via which the separating chamber pin can be pushed and at the same time displaced in the radial direction. The separation chamber pin can be displaced in a radial direction on the inclined insertion ramp of the receptacle on a second axial side and thus over its entire axial length. A favorable embodiment is one in which the inclined insertion ramp and the starting bevels have the same angle with respect to an axial extent of the separating comb pin, so that the separating chamber pin can be displaced axially on both sides in the radial direction.

In an alternative variant, the pump device further comprises at least one insertion element, the radial extent of which is dimensioned larger than that of the radial offset section. The at least one insert element can be inserted into the radial offset section in the axial direction and thereby displaces the separating chamber pin and the pump ring in the radial direction. The number of parts is admittedly thrust element larger, but conventional standardized separation chamber pins can be used, which are displaced in the radial direction via the insertion element. An offset element formed on the separation chamber pin can then be dispensed with. In a further development of the pump device, the hydraulic housing has two axially opposite radial offset sections and two insertion elements in relation to the pump ring carrier, whereby one insertion element can be inserted in each axial offset section and thereby the separating chamber pin and the pump ring of two axially opposing overlying pages offset only in the radial direction. This solution with two slide-in elements increases the number of parts again, but the radial offset of the separating chamber pin from two axial sides enables the pump ring to experience uniform radial compression on the hydraulic housing. The disclosure also includes the method for at least locally sealing the pump device described above, comprising a hydraulic housing and a drive shaft extending in the axial direction within the hydraulic housing, a pump ring carrier arranged in the radial direction between the hydraulic housing and the drive shaft, one in the radial direction between the Pump ring carrier and the hydraulic housing arranged elastic pump ring and one

Trennkammerpin. In the process, the separation chamber pin is first positioned in a state that completely extends the pump ring in the axial direction and is then displaced in the radial direction. As a result, the pump ring is pressed or pressed against the inner wall surface of the hydraulic housing to produce the at least local seal.

An embodiment of the method provides that along the radial Offset section of the hydraulic housing, the offset element, which is formed on the separation chamber pin or cooperates separately with the separation chamber pin, is inserted in the axial direction and thus the

Separation chamber pin and the pump ring offset in the radial direction. The method also includes the variant that the radial offset section designed as a radial step and the offset element designed on the separation chamber pin have the corresponding run-on slope, over which the separation chamber pin is pushed in the axial direction, at the same time to the separation chamber pin and the pump ring in the radial direction offset.

For the embodiment variant in which the hydraulic housing on the side axially opposite the radial offset section to the pump ring carrier forms the receptacle for the separating chamber pin and has the insertion ramp which runs obliquely in the radial direction, the method provides that the separating chamber pin in the axial direction over the oblique running insertion ramp is pushed and at the same time is displaced in the radial direction. As a result, the pump ring is pressed from its two axially opposite sides as a whole against the inner wall surface of the hydraulic housing. In the case of the solution in which the pump device has at least one insertion element, the radial extent of which is larger than that of the radial offset section, in one embodiment variant of the method the insert element is inserted into the radial offset section in the axial direction and thereby displaces the separating chamber pin and the pump ring in the radial direction only.

Furthermore, the method comprises the exemplary embodiment in which the hydraulic housing to the pump ring carrier has two axially opposed rings. has dial-offset sections and two insert elements, one insert element each being inserted in a radial offset section in the axial direction and thereby displacing the separating chamber pin and the pump ring from two axially opposite sides in the exclusively radial direction.

Other advantageous developments of the invention are characterized in the subclaims or are shown below together with the description of the preferred embodiment of the invention with reference to the figures. 1 shows a side sectional view of a section of a conventional pump device not according to the invention;

2a is a side sectional view of a section of a pump device in a first embodiment,

2b shows the side sectional view of the detail from FIG. 2a with the separation chamber pin fitted;

3a is a side sectional view of a section of a pump device in a second embodiment,

3b shows the side sectional view of the detail from FIG. 3a with the separation chamber pin mounted;

Fig. 4 sectional view A-A of Fig. 2a and 3a

Fig. 5 sectional view B-B of Fig. 2b and 3b

The same reference numerals designate the same technical elements in all views. 1 shows a sectional side view of a section of a conventional pump device 100 with a hydraulic housing 101, a pump ring carrier 103 arranged in the hydraulic housing 101 and an elastic pump ring 102 arranged between them. The pump device 100 is not necessarily state of the art, but only represents the problem solved by the invention. During assembly, a separation chamber pin 104 is pushed in the axial direction into the pump ring 102 and simultaneously presses with its free axial end against the pump ring 102 axial and radial direction for pressing on the inner wall surface of the hydraulic housing 101, wherein damage to the pump ring 102 cannot be ruled out by the axial force.

2a and 2b show a first embodiment variant of a section of the pump device 1 in a lateral sectional view, the radial direction RR running vertically and the axial direction AR running horizontally. Other components of the pump device 1, such as the drive motor or the drive shaft, have been omitted for reasons of clarity. The pump device 1 comprises, as essential components, the hydraulic housing 2 formed from several parts, the pump ring carrier 5, the elastic pump ring 3 arranged in the radial direction between the pump ring carrier 5 and the hydraulic housing 2 and the separating chamber pin 4. FIG. 2a shows the

Isolation chamber pin 4 in the pre-assembly state, Fig. 2b in the final assembly state. A connection 20 for conveying liquid is shown on the outside of the hydraulic housing 2. The hydraulic housing 2 can also be replaced in part by flanges.

The hydraulic housing 2 has an insertion channel 12 for the

Isolation chamber pin 4, on the first axial side of the radial offset section 6 designed as a radial step and on its second axial side the receptacle 9 are provided for the separation chamber pin 4. The radial stage of the radial offset section 6 on the hydraulic housing 2 forms a run-up slope 7, via which the separating chamber pin 4 can be displaced in the radial direction. In the preassembly position according to FIG. 2a, the radially outer insertion plane EE of the outer surface of the separating chamber pin 4 runs parallel and at a slight distance in the radial direction from the pump ring plane PE of the pump ring 3, so that the separating chamber pin 4 on the pump ring up to the state shown in FIG. 2a 3 can be passed in the axial direction without exerting an axial force on it. The offset element is formed in one piece on the separation chamber pin 4 as a local thickening 14 in the axial end section. The transition between the thickening 14 and the remaining separation chamber pin 4 also takes place via a run-up slope 8 which is shaped in accordance with the run-up slope 7 of the radial step. If the separation chamber pin 4 is pushed into its final assembly position according to FIG. 2b in the axial direction AR, the separation chamber pin 4 is displaced radially outwards by the radial extension of the thickening 14 of the separation chamber pin 4 and at the same time presses the elastic pump ring 3 against the inner wall surface 21 of the hydraulic housing 2, as shown in Fig. 2b. To ensure a radial offset of the separating chamber pin 4 over its entire axial length, the receptacle 9 has the insertion ramp 10 at an angle corresponding to the run-up slope 7 of the hydraulic housing 2. For this purpose, the separation chamber pin 4 forms a conical taper 11 at its free axial end, which in the embodiment shown is shaped in accordance with the insertion ramp 10. 2b, the separating chamber pin 4 is fully inserted into the receptacle 9, and the seal between the pump ring 3 and the inner wall surface 21 has been carried out.

In Figures 3a and 3b, an alternative variant of the pump device 1 is shown in sections as side sectional views, the same Features of Figures 2a and 2b are not repeated, however, are hereby considered disclosed. In a modification to the solution according to FIGS. 2a and 2b, the radial offset section 6 of the hydraulic housing 2 is of quite angled design and is identical on both axially opposite sides of the pump ring carrier 5. In the pre-assembly position according to FIG. 3a, the separation chamber pin 4 is already positioned so that it completely extends over the pump ring 3 in the axial direction. The insertion level EE and the pump ring level PE coincide in the embodiment shown without a gap. In the radial offset sections 6, an insertion element 22 is axially inserted on both sides, the radial extent of which is larger than that of the radial offset sections 6. The insertion elements 22 each have a bevel 23 on their edge sections facing the separating chamber pin 4 to be able to be introduced better and thereby move the separating chamber pin 4 and the elastic pump ring 3 in the exclusively radial direction RR and press against the inner wall surface 21 of the hydraulic housing 2.

FIGS. 4 and 5 show the sectional views A-A of FIGS. 2a and 3a and B-B of FIGS. 2b and 3b, the radial offset of the separating chamber pin 4 and the resulting compression of the pump ring 3 against the inner wall surface 21 of the hydraulic housing 2 being evident.

On the hydraulic housing 2 radial channels 24 are also provided for fluid communication with a pump chamber between the inner wall surface 21 of the hydraulic housing 2 and the pump ring 3, the pump ring 3 seen in the circumferential direction separating the two radial channels 24. Although not shown in the figures, an alternative embodiment also includes combining the two exemplary embodiments according to FIGS. 2a and 2b with one another and on an axial side the solution according to FIGS. 3a, 3b with rectangular radial offset sections 6 and an insertion element 22 on the opposite axial side to provide a solution according to Figure 2a, 2b with insert 9, the separating chamber pin 4 is formed on its two axial sides according to the game shown Ausführungsbei.

Claims

claims

1. Pump device for pumping a liquid, comprising a hydraulic housing (2), a pump ring carrier (5) arranged in the hydraulic housing (2) and one in the radial direction (RR) between the pump ring carrier (5) and the hydraulic housing (2 ) arranged elastic pump ring (3), and one

Separation chamber pin (4), the pump ring (3) for generating an at least local seal on the hydraulic housing (2) by the separation chamber pin (4) in the radial direction (RR) against an inner wall surface of the hydraulic housing (2), and wherein the hydraulic housing (2) has a radial offset section (6) along which an offset element which is formed on the separation chamber pin (4) or which cooperates separately with the separation chamber pin (4) can be inserted in the axial direction (AR) and thus the separation chamber pin (4 ) and the pump ring (3) in the radial direction.

2. Pump device according to claim 1, characterized in that the separating chamber pin (4) in an axial direction (AR) completely overstretching the pump ring (3) in the radial direction (RR) can be displaced around the pump ring (3) at the same time to press against the inner wall surface of the hydraulic housing (2) over its entire effective axial length.

3. Pump device according to claim 1 or 2, characterized in that the radial offset section (6) of the hydraulic housing (2) is designed as a radial step. 4. Pump device according to one of the preceding claims, characterized in that the offset element is formed in one piece with the separation chamber pin (4).

5. Pump device according to one of the preceding claims, characterized in that a radially outer insertion plane (EE) of a lateral surface of the separation chamber pin (4) in the radial direction (RR) with respect to a pump ring plane (PE ) of the pump ring (3) in a pre-assembled state of the separation chamber pin (4) runs without overlap.

6. Pump device according to the preceding claim, characterized in that the radial stage and the

Separation chamber pin (4) formed offset element have a corresponding run-on slope (7, 8), via which the

Separation chamber pin (4) can be pushed in the axial direction (AR) in order to simultaneously generate a radial offset of the separation chamber pin (4) and the pump ring (3).

7. Pump device according to one of the preceding claims 1-4, characterized in that the hydraulic housing (2) on a the radial offset section (6) to the pump ring carrier (5) axially opposite side a receptacle (9) for the

Separation chamber pin (4), the receptacle (9) having an insertion ramp (10) which runs obliquely in the radial direction (RR), via which the separation chamber pin (4) can be pushed and at the same time in a radial direction

Direction (RR) is shiftable.

8. Pump device according to one of the preceding claims 1-3, further comprising at least one insertion element (22), the radial extent of which is dimensioned larger than that of the radial offset section, and in the axial direction (AR) in the radial

Offset section is insertable and thereby the separating chamber pin (4) and the pump ring (3) in the exclusively radial direction (RR) puts.

9. Pump device according to the preceding claim, characterized in that the hydraulic housing (2) to the pump ring carrier (5) has two axially opposite radial offset sections and two insertion elements (22), one insertion element each

(22) can be inserted into a radial offset section in the axial direction (AR) and the separation chamber pin (4) and the pump ring (3) are offset from two axially opposite sides in the exclusively radial direction (RR). 10. Method for at least locally sealing a pump device for pumping a liquid, the pump device comprising a hydraulic housing (2), a pump ring carrier (5) arranged in the hydraulic housing (2) and a radial direction between the pump ring carrier (5) and the hydraulic housing ( 2) arranged elastic pump ring (3), and a separating chamber pin (4), with the separating chamber pin (4) first being positioned in a state that completely extends the pump ring (3) in the axial direction and then being displaced in the radial direction (RR) and thereby the pump ring (3) for generating the at least local seal against the inner wall surface (21) of the hydraulic housing

(2) presses.

11. The method according to the preceding claim, characterized

shows that the hydraulic housing (2) has a radial offset section, along which an offset element, which is formed on the separation chamber pin (4) or separately and which interacts with the separation chamber pin (4), is inserted in the axial direction (AR) and thus the separation chamber pin (4) and the pump ring (3) in the radial direction (RR) is offset.

12. The method according to any one of the preceding claims 8-9, characterized in that the radial offset portion of the hydraulic housing is designed as a radial step, the radial step and the offset element formed on the separating chamber pin (4) having a corresponding run-up slope (7, 8 ), over which the separation chamber pin (4) is pushed in the axial direction in order to simultaneously move the separation chamber pins (4) and the pump ring (3) in the radial direction (RR). 13. The method according to any one of the preceding claims 8-9, characterized in that the hydraulic housing (2) on a the radial offset portion to the pump ring carrier (5) axially opposite lying side forms a receptacle for the separation chamber pin (4), where the The receptacle (9) has an insertion ramp (10) which extends obliquely in the radial direction (RR), and the separating chamber pin (4) is pushed in the axial direction (AR) over the inclined insertion ramp (10) and at the same time in the radial direction (RR ) is moved.

14. The method according to any one of the preceding claims, characterized in that the pump device (1) has at least one insertion element (22), the radial extent of which is dimensioned larger than that of the radial offset section, and that in the axial direction (AR ) is inserted into the radial offset section, thereby displacing the separation chamber pin (4) and the pump ring (3) in the exclusively radial direction (RR). 15. The method according to any one of the preceding claim, characterized in that the hydraulic housing (2) to the pump ring carrier (5) two axially opposite radial offset sections and has two slide-in elements (22), one slide-in element (22) each being inserted into a radial offset section in the axial direction (AR) and the separating chamber pin (4) and the pump ring (3) from two axially opposite sides move only in the radial direction (RR).