WO2020249396A1

WO2020249396A1 - Pump, in particular a pump for a fluid circuit in a vehicle

Info

Publication number: WO2020249396A1
Application number: PCT/EP2020/064667
Authority: WO
Inventors: Theodor Hüser
Original assignee: HELLA GmbH & Co. KGaA
Priority date: 2019-06-11
Filing date: 2020-05-27
Publication date: 2020-12-17
Also published as: DE102019115778A1; CN117927476A; CN113994100A

Abstract

The invention relates to a pump, in particular for a fluid circuit in a vehicle, e.g. a coolant pump comprising a multi-part housing (10, 20, 30, 40) having an inlet (103), a pump chamber (P), an outlet (104), a motor chamber (M) and a motor (50, 60) for driving the impeller wheel (90), wherein an impeller wheel (90) is arranged in the pump chamber (P), wherein the motor chamber (M) is radially outwardly limited by a first wall (30) in which a stator (50) of the motor is embedded, wherein a rotor (60) of the motor is arranged in the motor chamber (M), wherein the rotor (60) is rotationally fixed to the impeller wheel (90) via a shaft (601), wherein the shaft (601) is mounted in a bushing (206) in a second wall (204) between the pump chamber (P) and the motor chamber (M), wherein 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), which connects the motor chamber (M) and the pump chamber (P) to one another, or wherein at least one groove is provided on an outer side of the bushing (206), forming a channel together with the second wall (204), which connects the motor chamber (M0 and the pump chamber (P) to one another.

Description

Pump, in particular a pump for a fluid circuit in a vehicle

description

The invention relates to a pump, in particular for a fluid circuit in a vehicle, for example a coolant pump with a multi-part housing which has an inlet, a pump chamber, an outlet, a motor chamber and a motor for driving the impeller,

- an impeller being arranged in the pump chamber,

- The motor chamber is delimited radially outward by a first wall in which a stator of the motor is embedded,

- wherein a rotor of the motor is arranged in the motor chamber,

- The rotor is non-rotatably connected to the impeller via a shaft,

- The shaft is mounted in a socket in a second wall between the pump chamber and the motor chamber.

Such pumps are known from document DE 10 2011 055 599 A1 and from the German patent application with the official file number DE 10 2018 125 031. These have a multi-part housing with the pump chamber, the motor chamber and an electronics chamber. In the pump chamber, the impeller is arranged to be driven by the motor, which is arranged in the motor chamber. An electrical circuit with which the motor can be controlled and / or regulated is provided in the electronics chamber.

The rotor and a rotor of the motor are connected to one another via the shaft.

The shaft is guided through a wall of the housing, through which the pump chamber and the motor chamber are separated from each other. In the wall a La gerbüchse is provided in which the shaft and also the rotor and the impeller are rotatably mounted.

The socket in the wall between the motor chamber and the pump chamber of the pump described in the application DE 10 2018 125 031 points on an inside Grooves on. Via these grooves, a connection between the motor chamber and the pump chamber is created even when the shaft is inserted in the socket. A liquid can be transported from the motor chamber into the pump chamber via this connection.

This connection established via the grooves has some advantages, which are described in DE 10 2018 125 031 application. A disadvantage, however, is that particles contained in the liquid conveyed through the grooves of the bushing can spread in the bushing, which forms the bearing for the shaft. This can lead to contamination or other impairment of the properties of the bearing or even to damage to the bearing.

The invention is based on the object of establishing a connection between the Motorkam mer and the pump chamber without affecting the bearing of the shaft.

One way of avoiding impairment of the bearing of the shaft is to establish the connection between the motor chamber and the pump chamber via a channel in the shaft, but this has other disadvantages and is also very complex. The inventor has therefore rejected the possibility of the hollow shaft.

Rather, the inventor has solved the problem by

- That in the second wall between the pump chamber and the Motorkam mer radially outside of the bushing at least one through hole is provided which connects the motor chamber and the pump chamber to one another, or

- That at least one groove is provided on an outside of the socket, which together with the second wall forms a through hole which connects the engine chamber and the pump chamber to one another.

A connection between the motor chamber and the pump chamber is established through the through hole according to the invention, without any through the hole Guided liquid comes into contact with the bearing and the bearing is affected by particles entrained in the liquid.

According to the invention, it is possible that the impeller has a bushing which is connected to the shaft in a rotationally fixed manner, while the rest of the impeller is connected to the bushing in a rotationally fixed manner. In the rest of the impeller, at least one through hole can then be provided radially outside the book se of the impeller. Such a through hole can compensate for an axial load that acts on the unit comprising the rotor and the impeller, for example due to different pressures on the side of the impeller facing the inlet and the side of the impeller facing the engine chamber.

The bushing of the impeller and / or the bushing for mounting the shaft in an inne ren wall have at least one groove. The through holes provided according to the invention between the motor chamber and the pump chamber could, however, have the disadvantage that gas bubbles, in particular air bubbles that collect in the area of the axis of rotation of the rotor, are not or only insufficiently discharged from the motor chamber. A discharge then takes place, for example, through a gap between the shaft and the bushing, which is preferably constantly filled with the liquid for hydrodynamic storage during operation. If gas collects in the motor chamber, however, this can lead to insufficient cooling of the motor. It can therefore be useful to have at least one groove on the inside of the socket in addition to the through holes provided according to the invention in order to avoid gas accumulation. This at least one groove can have a clear cross section which is available for the transport of liquid and which is smaller than the clear cross section of the at least one through hole. The cross section of the at least one groove can be, for example, a fraction of the clear cross section of the at least one through hole. A major part of a flow established between the motor chamber and the pump chamber is then guided via the through holes. Particles in the liquid are conveyed due to their high density in comparison to liquid and in comparison to gas bubbles by this main stream flowing radially further outward. The at least one groove in socket in The second wall between the motor chamber and the pump chamber, on the other hand, only carries small amounts of liquid and gas that, due to its low density, collects in the middle of the motor chamber.

An annular chamber can be formed between the first wall and a third wall which lies radially outside the first wall. This annular chamber can be connected to the pump chamber via at least one through hole.

The invention is explained in more detail below with reference to the accompanying drawings. It shows:

Fig. 1 is a perspective view of a pump,

Fig. 2 shows a longitudinal section through the pump from Fig. 1 and

Fig. 3 shows the longitudinal section as in Fig. 2, but with indicated by arrows

Path of the liquid through the pump.

The first pump has a multi-part housing which has a pump housing 10, a motor housing 20, an electronics housing 30 and a cover 40, a stator 50 of a motor of the pump being provided in the electronics housing 30. The motor of the pump is completed by a rotor 60 which is rotatably mounted on the Motorgehäu se 20 and in which the stator 50 is immersed. The stator 50 in turn dips into 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. An electronics chamber E, in which the circuit carrier 70 and the circuit 80 are arranged, is delimited by the electronics housing 30 and the cover 40 of the housing.

The housing parts can be made of plastic, for example Vyncolit. The stator 50 is cast in the electronics housing 30, preferably in a first wall 301 which is formed by an apron of the electronics housing 30. By screws, not shown, the pump housing 10 and the Motorge housing 20 are connected to each other. The cover 40 and the electronics housing 30 and the electronics housing 30 and the motor housing 20 are connected to one another by screws, also not shown.

In order to achieve a pressure-resistant connection between the pump housing 10 and the motor housing 20, a flange 101 of the pump housing 10 has a web 102 running around it, which positively engages in an annular groove 203 of the motor housing provided in a first flange 201 of the motor housing 20 is.

In this way, expansion of the pump housing 10 and the motor housing 20 during operation of the pump due to the pressure prevailing there can be avoided or at least reduced.

The pump housing 10 and a wall 204 of the motor housing, namely a second wall which is penetrated by a motor shaft 601, include a Pumpenkam mer P in which the impeller 90 is located. The pump chamber P can be connected via a suction port 103 of the pump housing 10 to a line through which the liquid to be pumped is sucked in. The intake connector 103 is arranged coaxially to an axis of rotation of the rotor 60.

The pump chamber P can be connected via an outlet connection 104 to a line into which the pumped liquid is pressed. An outer wall of the pump housing 10 and the impeller 90 delimit a spiral space S, which expands in a spiral-like manner to the outlet of the pump chamber. The impeller 90 is designed in a manner known per se, for example in a manner described in the document DE 10 2011 055 599 A1, FIG. 2,

3 or 5 illustrated type, to which reference is made for a more detailed explanation of an impeller 90 in question for a pump according to the invention.

The pump has an impeller 90 which is rotatably arranged in the pump housing 10 and is attached to a shaft 601 of the rotor 60 which protrudes into the pump housing 10. The impeller 90 has a rim 903 on a side facing away from the motor housing 20. The ring 903 engages in an annular groove 106 in the pump housing 10. The annular groove 106 and the ring 903 have a larger diameter than the free cross section of the inlet connector 103. The ring 903 therefore does not impede a liquid flow from the inlet connector 103 into the pump chamber P. Since the ring 903 is immersed in the annular groove 106, the ring 903 also does not come into contact with the liquid flowing in. Movement of the ring 903 therefore has no influence on the inflowing liquid.

The ring 903 of the impeller 90 is in the annular groove 106 of the pump housing 10 leads ge.

Between the ring 903 and an inner wall 108 of the annular groove 104 and between the ring 903 and an outer wall 107 of the ring groove 106 there is an inner and an outer annular gap. The ring 903 dipping into the annular groove 106 prevents a flow of liquid past the impeller 90 from the intake port 103 to the outlet. At most, a small leakage current is possible through the annular gap.

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

In the already mentioned wall 204, through which the rotor shaft 601 protrudes, a bush 206 is provided, which serves as a bearing for the rotor shaft 601. The bushing 206 for mounting the rotor shaft is inserted into the already mentioned wall 204 and firmly connected to the rest of the motor housing 20. The bush 206 has a through hole, the cross section of which is adapted to the rotor shaft 601. One or more grooves (not shown) can be provided axially in the wall of the through hole, by the inserted rotor shaft 601 a liquid between the pump chamber P and a limited by the motor housing 20 and the skirt 301 motor chamber M and vice versa can flow. Small amounts of the liquid passed through the grooves 207 are carried along by the shaft 601 when the rotor rotates and ensure lubrication between the rotor shaft 601 and the bushing 206.

In the wall 204, which is penetrated by the rotor shaft 601, one or more through holes 208 are provided in the area of the spiral space S, which provide a connection between the spiral space S and one of the motor housing 20, the apron 301 and an end wall 303 of the electronics housing 30 limited annular chamber R creates or create. A liquid can be conveyed through the through holes 208 from the spiral space, which lies on the floch pressure side of the impeller 90, 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 skirt 301. The through holes 304 are provided in the vicinity of the end wall 303. A liquid that passes 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 skirt 301, to the side of the motor chamber M facing the rotor 60 of the pump chamber P will.

In the pump, first through holes 603 and second through holes 604 are provided in a region of the rotor 60 between the shaft and the permanent magnet. The first through holes 603 extend parallel to the shaft 601 in an area immediately adjacent to the shaft 601. The second through holes 603 are radially further away from the rotor shaft 601 and thus closer to a permanent magnet that is embedded in the rotor. Both through holes connect a space of the motor chamber on a first side of the rotor and a space of the motor chamber on a 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 bush 206 of the rotor shaft 601, through holes 209 in the wall 204 and the through holes 902 in the impeller 90, the liquid can speed to the inlet side of the impeller 90, i.e. be promoted on the low-pressure side of the Laufra 90 (see Fig. 3). There is thus a continuous connec tion from the spiral space S, i.e. the high-pressure side of the pump chamber P, via the through holes 208 between the spiral space S and the annular chamber R into the annular chamber R, from there via the through holes 304 between the annular chamber R and the Motor chamber M into the motor chamber M and from the motor chamber M via the through holes 603, 604 and possibly via the grooves 207 in the bearing bush 206, the through holes 209 and the through holes 902 in the bushing 901 of the impeller 90 to the inlet side of the impeller 90, the Low-pressure side of the pump chamber P. During operation of the pump, a liquid flow occurs along this path that is significantly smaller than the flow conveyed by the pump into the outlet, but is large enough to provide sufficient cooling for the Reach the pump.

List of reference symbols

10 pump housing

101 flange

102 bridge

103 intake manifold

104 outlet port

106 ring groove

107 outer wall

108 inner wall

20 motor housing

201 first flange

203 ring groove

204 second wall

206 socket

207 grooves

208 through holes

209 through holes

30 electronics housing 301 apron, first wall

303 front wall

304 through holes

40 lids

50 stator

60 rotor

601 rotor shaft

603 first through holes 04 second through holes 0 circuit carrier

80 circuit

90 impeller

901 socket

902 through holes

903 wreath

E electronics chamber P pump chamber

S spiral space

Claims

1. Pump, in particular for a fluid circuit in a vehicle, for example a coolant pump with a multi-part housing (10, 20, 30, 40) which has an inlet (103), a pump chamber (P), an outlet (104), a Has a motor chamber (M) and a motor (50, 60) for driving the impeller (90),

- An impeller (90) being arranged in the pump chamber (P),

- The motor chamber (M) being delimited radially outward by a first wall (301) into which a stator (50) of the motor is embedded,

- wherein a rotor (60) of the motor is arranged in the motor chamber (M),

- wherein the rotor (60) is non-rotatably connected to the impeller (90) via a shaft (601),

- wherein the shaft (601) is mounted in a bushing (206) in a second wall (204) between the pump chamber (P) and the motor chamber (M),

characterized,

- That in the second wall (204) between the pump chamber (P) and the motor chamber (M) radially outside the bush (206) at least one through hole (209) is provided, which the motor chamber (M) and the pump chamber (P ) connects, or

- That on an outside of the bushing (206) at least one groove is seen, which together with the second wall (204) forms a channel which connects the motor chamber (M) and the pump chamber (P).

2. Pump according to claim 2, characterized in that the impeller (90) has a bushing (901) which is non-rotatably connected to the shaft (601) and that the rest of the impeller (90) is non-rotatably connected to the bush (901), and that at least one through hole is provided in the rest of the impeller radially outside the bush (901) of the impeller (90).

3. Pump according to claim 1 or 2, characterized in that the bush (901) of the impeller (90) and / or the bush (206) for mounting the shaft (601) in an inner wall have at least one groove.

4. Pump according to one of claims 1 to 3, characterized in that an annular chamber (R) is formed between the first wall and a third wall which is located radially outside the first wall (301), this annular chamber (R) above at least one through hole is connected to the pump chamber (P).