Pump comprising an axially acting spring gasket

Patent metadata

Field	Value
Publication number	US-11808263-B2
Application number	US-202117351382-A
Country	US
Kind code	B2
Filing date	Jun 18, 2021
Priority date	Jun 25, 2020
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A pump for applying fluid to an assembly, the pump including: a pump housing featuring a circumferential wall surrounding a delivery chamber of the pump, an end-facing housing wall including an outer end-facing surface of the housing which faces axially away from the delivery chamber, an inlet and an outlet for the fluid which emerges on the outer end-facing surface of the housing; a delivery member, moveable within the delivery chamber, for delivering the fluid from a low-pressure side of the pump which includes the inlet to a high-pressure side of the pump which includes the outlet; and an axial gasket which fully surrounds the outlet, in order to separate it from the low-pressure side, in an axial view onto the end-facing wall of the housing. The axial gasket is a spring gasket in the form of a disc spring or hollow-profile spring or V-profile spring or bellows spring.

First claim

The invention claimed is:

1. A pump for applying fluid to an assembly, the pump comprising:
a pump housing including
a circumferential wall surrounding a delivery chamber of the pump;
an end-facing wall having an outer end-facing surface facing axially positioned away from the delivery chamber;
an inlet for receiving fluid into the delivery chamber;
an outlet for the fluid which emerges from the outer end-facing surface via the delivery chamber;
a delivery member which rotates within the delivery chamber, the delivery member delivering fluid within the delivery chamber from a low-pressure side of the pump which contains the inlet to another portion of the delivery chamber located on a high-pressure side of the pump which contains the outlet; and
an axial gasket being a spring gasket, the spring gasket fully encircles the outlet over 360° when viewed in an axial view of the pump in order to separate the outlet from the low-pressure side of the pump, wherein the spring gasket is annularly self-contained within the pump and is one of a disc spring or a hollow-profile spring or a V-profile spring or a bellows spring, and during operation of the pump the spring gasket performs
(i) a function of sealing the outlet of the pump housing from the low-pressure side of the pump, and
(ii) a function of a pressing device to keep the circumferential wall of the pump housing engaged to the end-facing wall of the pump housing in a fluid-tight axial pressure contact so that the spring gasket alone performs the function of sealing the outlet of the pump housing from the low-pressure side of the pump.

2. The pump according to claim 1 , wherein the spring gasket is the disc spring, and the disc spring comprises an inner circumference and an outer circumference which is axially offset with respect to the inner circumference, the disc spring further including a first sealing stay being fully circumferential near the inner circumference and a second sealing stay facing axially away from the first sealing stay, the second sealing stay being fully circumferential near the outer circumference, and wherein one of the sealing stays axially faces the outer end-facing surface of the pump housing and overlaps with the outer end-facing surface of the pump housing in the axial view, in order to separate the outlet from the low-pressure side in a fully circumferential sealing contact with the outer end-facing surface of the pump housing.

3. The pump according to claim 2 , wherein:
the disc spring extends from the inner circumference to the outer circumference over a first end-facing surface which axially faces the outer end-facing surface of the pump housing and extends over a second end-facing surface facing axially away from the outer end-facing surface of the pump housing,
a first transition region circumferentially connects the inner circumference to the first end-facing surface and a second transition region circumferentially connects the outer circumference to the second end-facing surface, a third transition region circumferentially connects the inner circumference to the second end-facing surface and a fourth transition region circumferentially connects the outer circumference to the first end-facing surface, and
one of the sealing stays of the disc spring extends in the first transition region and the other of the sealing stays of the disc spring extends in the second transition region, and at least one of the sealing stays of the disc spring is flattened and/or rounded with a larger radius of curvature as compared to the third transition region and/or the fourth transition region.

4. The pump according to claim 1 , wherein the spring gasket is a purely metal spring.

5. The pump according to claim 1 , wherein a portion of the spring gasket is located nearest the low-pressure side of the pump in a pressure path extending along the pump housing from the high-pressure side of the pump to the low-pressure side of the pump.

6. The pump according to claim 1 , wherein a portion of the spring gasket is located nearest the outlet in a pressure path extending along the pump housing from the outlet to the low-pressure side of the pump.

7. The pump according to claim 1 , wherein the pump comprises an additional gasket which surrounds the outlet in the axial view in order to seal the outlet off, and the spring gasket surrounds the additional gasket.

8. The pump according to claim 7 , wherein the additional gasket is a bead gasket.

9. The pump according to the claim 7 , wherein the additional gasket is a metal bead gasket.

10. The pump according to claim 7 , wherein the pump is fitted in or on an accommodating device, and the additional gasket is arranged between the outer end-facing surface of the pump housing and an end-facing surface of the accommodating device in an axial indirect line of force to the spring gasket.

11. The pump according to claim 1 , wherein the pump comprises a first flux including the inlet and the outlet and an additional flux including an additional outlet, and the spring gasket also surrounds the additional outlet in the axial view, in order to separate the outlets from the low-pressure side.

12. The pump according to claim 11 , wherein the additional flux further includes an additional inlet.

13. The pump according to claim 1 , wherein the pump comprises a first flux including the inlet and the outlet, an additional flux including an additional outlet, and an additional axial gasket in the form of an additional spring gasket which surrounds the additional outlet in the axial view, wherein the spring gasket and the additional spring gasket are each disc springs and are arranged adjacently in the axial view in order to separate the outlets from each other and from the low-pressure side of the pump.

14. The pump according to claim 13 , wherein the additional flux further includes an additional inlet.

15. The pump according to claim 1 , wherein the pump is fitted in or on an accommodating device, and the spring gasket is arranged and axially tensed between the outer end-facing surface of the pump housing and an end-facing surface of the accommodating device in an axial direct line of force.

16. The pump according to claim 1 , wherein: the pump comprises an accommodating device or is arranged in an accommodating device; the accommodating device surrounds the pump housing and comprises a base featuring an end-facing surface of the accommodating device and a port for the outlet; and the spring gasket is in a sealing contact with each of the outer end-facing surface of the pump housing and the end-facing surface of the accommodating device, in order to separate the high-pressure side from the low-pressure side of the pump.

17. The pump according to claim 16 , wherein
the spring gasket includes a first sealing stay and a second sealing stay,
the end-facing surface of the accommodating device is circumferentially smooth in the region of the second sealing stay which axially faces the end-facing surface of the accommodating device, in order to circumferentially form an uninterrupted sealing abutment for the second sealing stay which axially faces the end-facing surface of the accommodating device,
and/or
the outer end-facing surface of the pump housing is circumferentially smooth in the region of the first sealing stay which axially faces the outer end-facing surface of the pump housing, in order to circumferentially form an uninterrupted sealing abutment for the first sealing stay which axially faces the outer end-facing surface of the pump housing.

18. The pump accordin

Assignees

• Shw Automotive Gmbh

Inventors

• Welte Claus

Classifications

• F04C15/0023 Primary

  Axial sealings for working fluid · CPC title

• F01C19/005 Primary

  Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements (vane construction F01C21/0809; piston rings and ring sealings of similar construction in general F16J9/00) · CPC title

• F04C13/00

  Adaptations of machines or pumps for special use, e.g. for extremely high pressures (of pumps specially adapted for elastic fluids F04C25/00) · CPC title

• F04C15/06

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C2240/30

  Casings or housings · CPC title