CN117927476A

CN117927476A - Pump, in particular for a liquid circuit in a vehicle

Info

Publication number: CN117927476A
Application number: CN202410107212.3A
Authority: CN
Inventors: T·海瑟
Original assignee: Hella GmbH and Co KGaA
Current assignee: Hella GmbH and Co KGaA
Priority date: 2019-06-11
Filing date: 2020-05-27
Publication date: 2024-04-26
Also published as: DE102019115778A1; WO2020249396A1; CN113994100A

Abstract

The invention relates to a pump, in particular for a liquid circuit in a vehicle, such as a coolant pump, having a multi-part housing (10, 20, 30, 40) with an annular chamber (R) and a motor chamber (M), in which a rotor (60) of a motor (50, 60) of the pump is arranged, wherein the motor (50, 60) has the rotor (6) and a stator (50), the annular chamber (R) encloses the stator (50), and the stator (50) is thereby located between the motor chamber (M) and the annular chamber (R), wherein a flow connection is present between the annular chamber (R) and a space of the motor chamber (M) on a first side of the rotor (60).

Description

Pump, in particular for a liquid circuit in a vehicle

The application is a divisional application of the application patent application entitled "pump, in particular for a liquid circuit in a vehicle", international application number 2020, 5/27, international application number PCT/EP2020/064667, national application number 202080042158.9.

Technical Field

The invention relates to a pump, in particular for a liquid circuit in a vehicle, such as a coolant pump comprising a multi-piece housing with an inlet, a pump chamber, a discharge opening, a motor chamber and a motor for driving a running wheel;

-the running wheel is arranged in the pump chamber;

-the motor chamber is delimited radially outwards by a first wall in which the stator of the motor is embedded;

-the rotor of the motor is arranged in the motor chamber;

the rotor is connected to the running wheel by a shaft in a rotationally fixed manner;

the shaft is supported in the bushing in the second wall between the pump chamber and the motor chamber.

Background

Such pumps are known from document DE 10 2011 055 599 A1 and german patent application with official document number DE 10 2018 125031. The pump has a multi-piece housing including a pump chamber, a motor chamber, and an electronics chamber. A running wheel is provided in the pump chamber, which running wheel is driven by a motor provided in the motor chamber. An electrical circuit is provided in the electronics compartment, with which the motor can be controlled and/or regulated.

The running wheel and the rotor of the motor are connected to each other by a shaft. The shaft is guided through a wall of the housing, by means of which wall the pump chamber and the motor chamber are separated from each other. A bearing bush is arranged in the wall, in which bearing bush the shaft and also the rotor and the running wheel are rotatably supported.

The bushing in the wall between the motor chamber and the pump chamber of the pump described in application DE 10 2018 125 031 has a groove on the inside. By means of these grooves, the connection between the motor chamber and the pump chamber is also achieved in the shaft embedded in the bushing. Through this connection, liquid can be transported from the motor chamber into the pump chamber.

This connection established by means of the slots has some advantages, which are described in application DE 10 2018125 031. However, it is disadvantageous that particles contained in the liquid transported through the grooves of the bushing can diffuse in the bushing, which forms a bearing for the shaft. This can lead to contamination or other effects on the characteristics of the bearing or even to damage to the bearing.

Disclosure of Invention

The object of the invention is to create a connection between the motor chamber and the pump chamber without the bearings of the shaft being affected.

One possibility to avoid the influence of the bearing of the shaft is to establish a connection between the motor chamber and the pump chamber through a channel in the shaft, which however leads to other disadvantages and is also very complex. The inventors therefore forgo the possibility of a hollow shaft.

Rather, the inventors have solved the task by:

-at least one through hole radially outside the liner in the second wall between the pump chamber and the motor chamber, said through hole interconnecting the motor chamber and the pump chamber; or (b)

-Providing at least one groove on the outside of the bushing, said at least one groove together with the second wall forming a through hole interconnecting the motor chamber and the pump chamber.

By means of the through-hole according to the invention, a connection between the motor chamber and the pump chamber is established without contact of the liquid guided through the hole with the bearing occurring and the bearing being affected by particles carried in the liquid.

According to the invention, it is possible for the running wheel to have a bushing which is connected to the shaft in a rotationally fixed manner, while the remainder of the running wheel is connected to the bushing in a rotationally fixed manner. In the remaining part of the running wheel, at least one through-hole can then be provided radially outside the bushing of the running wheel. By means of such through-holes, a compensation of axial loads can be achieved, which act on the unit formed by the rotor and the running wheel, for example on the basis of different pressures on the inlet-facing side of the running wheel and on the motor chamber-facing side of the running wheel.

The bushing of the running wheel and/or the bushing for the bearing shaft has at least one groove in the inner wall. The through-opening provided according to the invention between the motor chamber and the pump chamber may of course have the disadvantage that air bubbles, in particular air bubbles which accumulate in the region of the axis of rotation of the rotor, are not or only insufficiently guided out of the motor chamber. The removal then takes place, for example, via the gap between the shaft and the bushing, which is preferably continuously filled with liquid for hydrodynamic bearings in operation. However, if gas is collected in the motor chamber, this may result in insufficient cooling of the motor. It may therefore be appropriate to have at least one groove on the inner side of the bushing, complementary to the through hole provided according to the invention, in order to avoid gas accumulation. The at least one groove may have a net cross-section available for liquid transport that is smaller than the net cross-section of the at least one through hole. The cross-section of the at least one groove may for example be a fraction of the net cross-section of the at least one through hole. The main part of the fluid formed between the motor chamber and the pump chamber is then guided through the through-hole. The particles in the liquid are transported by the main fluid flowing further outside in the radial direction based on their high density compared to the liquid and compared to gas bubbles. The at least one groove in the liner in the second wall between the motor chamber and the pump chamber, in contrast, directs only a small amount of liquid and gas, which collects in the center of the motor chamber based on its small density.

An annular chamber may be formed between the first wall and a third wall radially outward of the first wall. The annular chamber may be connected to the pump chamber by at least one through hole.

Drawings

The invention is further explained next with the aid of the figures. Here, it is shown that:

FIG. 1 shows a perspective view of a pump;

FIG. 2 shows a longitudinal section through the pump of FIG. 1; and

Fig. 3 shows a longitudinal section as in fig. 2, however including the travel of liquid through the pump, characterized by the arrows.

Detailed Description

The first pump has a multi-part housing with a pump housing 10, a motor housing 20, an electronics housing 30 and a cover 40, wherein a stator 50 of the motor of the pump is arranged in the electronics housing 30. The motor of the pump is completed by a rotor 60 which is rotatably mounted on the motor housing 20 and into which the stator 50 is immersed. The stator 50 is in turn immersed in the motor housing 20. Furthermore, a circuit carrier 70 is provided, on which an electronic circuit 80 is provided, via which the motor is supplied with electrical energy and is controlled. The electronics compartment E in which the circuit carrier 70 and the circuitry 80 are disposed is defined by the electronics housing 30 and the housing cover 40.

The housing part may be manufactured from plastic, for example Vyncolit. The stator 50 is injected in the electronics housing 30, preferably in a first wall 301 formed by a baffle of the electronics housing 30.

The pump housing 10 and the motor housing 20 are connected to each other by screws, not shown. The cover 40 and the electronic device housing 30 and the motor housing 20 are connected to each other by screws, which are also not shown.

In order to achieve a more pressure-resistant connection between the pump housing 10 and the motor housing 20, the flange 101 of the pump housing 10 has a circumferential tab 102 which engages in a form-locking manner in an annular groove 203 of the motor housing, which is provided in a first flange 201 of the motor housing 20. Expansion of the pump housing 10 and the motor housing 20 during operation of the pump due to the pressure prevailing there can thereby be avoided or at least reduced.

The pump housing 10 and the wall 204 of the motor housing, i.e. the second wall penetrated by the motor shaft 601, enclose a pump chamber P in which the running wheel 90 is located. The pump chamber P may be connected to a conduit through which the liquid to be pumped is pumped through the suction connection 103 of the pump housing 10. The suction connection 103 is arranged coaxially to the rotational axis of the rotor 60.

The pump chamber P is connectable via a discharge connection 104 to a conduit into which pumped liquid is pressed. The outer wall of the pump housing 10 and the running wheel 90 define a helical space S which extends helically to the discharge opening of the pump chamber. The running wheel 90 is constructed in a manner known per se, for example in the manner shown in fig. 2, 3 or 5 of the document DE 10 2011 055 599 A1, for a detailed explanation of the running wheel 90 considered in connection with the pump according to the invention, reference being made to the above.

The pump has a running wheel 90 which is rotatably arranged in the pump housing 10 and is fastened for this purpose to a shaft 601 of the rotor 60 which protrudes into the pump housing 10.

The running wheel 90 has a collar 903 on the side facing away from the motor housing 20. The collar 903 engages in an annular groove 106 in the pump housing 10. The annular groove 106 and the collar 903 have a diameter which is larger than the free cross section of the inlet nipple 103. The collar 903 thus does not impede the flow of liquid from the inlet nipple 103 into the pump chamber P. Because the collar 903 is immersed in the annular groove 106, the collar 903 is also not in contact with the incoming liquid. The movement of the collar 903 thus does not affect the inflowing liquid.

The nose 903 of the running wheel 90 is guided in an annular groove 106 of the pump housing 10.

An inner or outer annular gap exists between the collar 903 and the inner wall 108 of the annular groove 104 and between the collar 903 and the outer wall 107 of the annular groove 106. The collar 903, which is immersed in the annular groove 106, prevents a flow of fluid from the suction connection piece 103 to the outlet opening via the running wheel 90. If necessary, small leakage flows through the annular gap are possible.

The running wheel 90 has a bushing 901, preferably made of metal, which comprises a central through-hole, into which the rotor shaft 601 is inserted, so that the running wheel 90 is mounted on the rotor shaft 601 with the bushing 901 in a rotationally fixed manner, preferably with a press fit. Parallel to the central through-hole of the bushing 901, the rotor has a through-hole 902, through which liquid can flow from the side of the running wheel 90 facing the motor housing 20 to the side of the running wheel 90 facing the inlet.

In the already mentioned wall 204, which is penetrated by the rotor shaft 601, a bushing 206 is provided, which serves as a support for the rotor shaft 601. A bushing 206 for supporting the rotor shaft is embedded in the already mentioned wall 204 and is fixedly connected with the rest of the motor housing 20. The bushing 206 has a through-hole with a cross section adapted to the rotor shaft 601. One or more grooves (not shown) may be provided axially in the wall of the through-hole, through which grooves, upon loading of the rotor shaft 601, liquid may flow between the pump chamber P and the motor chamber M defined by the motor housing 20 and the baffle 301 and vice versa. A small amount of liquid guided through the grooves 207 is carried along by the shaft 601 when the rotor rotates and is responsible for lubrication between the rotor shaft 601 and the bushing 206.

In the wall 204 penetrated by the rotor shaft 601, one or more through-holes 208 are provided in the region of the spiral space S, which through-holes provide a connection between the spiral space S and the annular chamber R defined by the motor housing 20, the baffle 301 and the end wall 303 of the electronics housing 30. Liquid can be conveyed from the screw space, which is on the high-pressure side of the running wheel 90, through the through-holes 208 into the annular chamber R.

The annular chamber R is connected to the motor chamber M by one or more radial through holes 304 in the baffle 301. A through hole 304 is provided in the vicinity of the end wall 303. The liquid transferred from the annular chamber R into the motor chamber M can be conveyed through the motor chamber M, for example through a gap between the rotor 60 and the baffle 301, to the side of the motor chamber M facing the pump chamber P with respect to the rotor 60.

In the pump, a first through hole 603 and a second through hole 604 are provided in the region of the rotor 60 between the shaft and the permanent magnet. The first through hole 603 extends parallel to the axis 601 in a region directly adjacent to the axis 601. The second through hole 603 is further radially distant from the rotor shaft 601 and thereby closer to the permanent magnets embedded in the rotor. The two through holes connect the space of the motor chamber on the first side of the rotor and the space of the motor chamber on the second side of the rotor.

Through the through-holes 603, 604 in the rotor 60, the already mentioned and optionally provided grooves in the bearing bushing 206 of the rotor shaft 601, the through-holes 209 in the wall 204 and the through-holes 902 in the running wheel 90, liquid can be transported onto the entry side of the running wheel 90, i.e. the low-pressure side of the running wheel 90 (see fig. 3). There is thereby a continuous connection from the screw space S, i.e. the high-pressure side of the pump chamber P, through the through-hole 208 between the screw space S and the annular chamber R into the annular chamber R, from there through the through-hole 304 between the annular chamber R and the motor chamber M into the motor chamber M and from the motor chamber M through the through-holes 603, 604 and, if appropriate, through the groove 207 in the support bushing 206, the through-hole 209 and the through-hole 902 in the bushing 901 of the running wheel 90 to the entry side of the running wheel 90, the low-pressure side of the pump chamber P. During operation of the pump, a flow of fluid is formed along this path, which, although significantly smaller than the fluid fed from the pump into the outlet, is of such a size that sufficient cooling of the pump is achieved during nominal operation.

List of reference numerals

10 Pump casing

101 Flange

102 Tab

103 Suction connection tube

104 Discharge connection pipe

106 Annular groove

107 Outer wall

108 Inner wall

20 Motor housing

201 First flange

203 Annular groove

204 Second wall

206 Bushing

207 Groove

208 Through hole

209 Through hole

30 Electronic equipment shell

301 Baffle plate, first wall

303 End wall

304 Through hole

40 Cover

50 Stator

60 Rotor

601 Rotor shaft

603 First via hole

604 Second through hole

70 Circuit carrier

80 Circuit

90 Running wheel

901 Bushing

902 Through hole

903 Convex ring

E electronic equipment room

P pump chamber

S spiral space

Claims

1. Pump, in particular for a liquid circuit in a vehicle, such as a coolant pump, having a multi-part housing (10, 20, 30, 40) with an annular chamber (R) and a motor chamber (M), in which a rotor (60) of a motor (50, 60) of the pump is arranged, wherein the motor (50, 60) has the rotor (6) and a stator (50), the annular chamber (R) encloses the stator (50), and the stator (50) is thereby located between the motor chamber (M) and the annular chamber (R),

It is characterized in that the method comprises the steps of,

There is a flow connection between the annular chamber (R) and the space of the motor chamber (M) on the first side of the rotor (60).

2. Pump according to claim 1, characterized in that the stator (50) is injected into the electronics housing (30) of the multi-piece housing (10, 20, 30, 40), i.e. into the baffle (301) of the electronics housing (30),

Preferably, for said flow connection, the annular chamber (R) is connected to the motor chamber (M) through one or more radial through holes (304) in the baffle (301).

3. Pump according to claim 2, characterized in that the annular chamber (R) is defined by the motor housing (20) of the multi-piece housing (10, 20, 30, 40), the baffle (301) and the end wall (303) of the electronics housing (30) of the multi-piece housing (10, 20, 30, 40),

Preferably, the through hole (304) is provided in the vicinity of the end wall (303).

4. A pump according to claim 2 or 3, characterized in that a gap is provided between the rotor (60) and the baffle (301) of the pump, through which gap liquid can be conveyed through the motor chamber (M) to the motor chamber (M) with respect to the rotor (60) towards the second side of the pump chamber (P).

5. The pump according to any one of claims 1 to 4, wherein the rotor (60) is rotatably supported on the motor housing (20),

Preferably, the rotor (60) has a rotor shaft (601) which protrudes through a wall (204) of the pump housing (10) facing the multi-part housing (10, 20, 30, 40).

Preferably, a bushing (206) is formed in the wall (204).

Preferably, the bushing (206) has a through-hole, the cross-section of which is adapted to the rotor shaft (601).

Preferably, one or more grooves (207) are provided in the wall of the through-hole in the axial direction, through which grooves liquid can flow between the pump chamber (P) and the motor chamber (M) and vice versa when the rotor shaft (601) is fitted.

6. Pump according to one of claims 1 to 5, characterized in that the motor chamber (M) is defined by a motor housing (20) and a baffle (301).

7. Pump according to one of claims 1 to 6, characterized in that there is a flow connection between the pump chamber (P), in particular the high-pressure side of the pump chamber, and the annular chamber (R).

8. Pump according to one of claims 1 to 7, characterized in that one or more through holes (208) are provided in the region of the spiral space (S) forming the high-pressure side of the pump chamber, which through holes provide a flow connection between the spiral space (S) and the annular chamber (R).

9. Pump according to claim 5, characterized in that there is a flow connection between the space of the motor chamber (M) on the second side of the rotor (60) and the pump chamber (P), in particular the low-pressure side of the pump chamber,

Preferably, the pump has an operating wheel (90) which is arranged in the pump chamber (P) and which is driven by a rotor (60),

Preferably, the running wheel (90) has a bushing (901) with a central through-hole, into which the rotor shaft (601) is inserted, so that the running wheel (90) is mounted on the rotor shaft (601) in a rotationally fixed manner by means of the bushing (901).

Preferably, the bushing (901) has through holes (902) parallel to the central through hole of the bushing (901), through which liquid can flow from the side of the running wheel (90) facing the motor housing (20) to the side of the running wheel (90) facing the inlet.

10. Pump according to claim 5, characterized in that the motor chamber (M) is delimited radially outwards by a first wall (301) in which the stator (50) of the motor is embedded, the rotor shaft (601) being supported in a bushing (206) in a second wall (204) between the pump chamber (P) and the motor chamber (M).

11. The pump according to claim 10, wherein the pump is configured to pump fluid,

At least one through hole (209) is provided in the second wall (204) between the pump chamber (P) and the motor chamber (M) radially outside the bushing (206), said at least one through hole interconnecting the motor chamber (M) and the pump chamber (P), or

At least one groove is provided on the outside of the bushing (206), which together with the second wall (204) forms a channel interconnecting the motor chamber (M) and the pump chamber (P).

12. The pump according to claim 9, wherein the pump is configured to pump fluid,

The running wheel (90) has at least one collar (903) surrounding the inlet (103) on the side facing the inlet coaxially to the axis of rotation of the running wheel, while the multi-part housing has at least one annular groove (104) surrounding the inlet on the side facing the pump chamber (P) and coaxially to the axis of rotation of the running wheel (90), into which the collar (903) engages;

or the running wheel (90) has at least one annular groove surrounding the inlet (103) on the side facing the inlet (103) and coaxially to the axis of rotation of the running wheel (90), while the multi-part housing has at least one collar facing the pump chamber (P) surrounding the inlet, said collar engaging in the annular groove.

13. The pump of claim 12, wherein the collar and the annular groove form a seal between the inlet and the pump chamber,

Preferably, the rotor (60) and/or the running wheel (90) are supported in a first bearing in the multi-part housing (10, 20, 30, 40), the collar and the annular groove forming a second bearing for supporting the running wheel and/or the rotor,

Preferably, the rotor shaft (601) is rotatably supported in a bushing (206) in a wall (204) of the multi-piece housing separating the pump chamber (P) and the motor chamber (M), thereby constituting the first bearing.