CN113939656A

CN113939656A - Pump, in particular for a liquid circuit in a vehicle, having an improved impeller support

Info

Publication number: CN113939656A
Application number: CN202080041938.1A
Authority: CN
Inventors: C·本施; H·费尔德坎普; I·戈伊; T·海瑟; D·尼斯; T·兰普塞尔; V·拉辛; A·鲁特; S·威尔特; T·威利-里斯; J·张
Original assignee: Hella GmbH and Co KGaA
Current assignee: Hella GmbH and Co KGaA
Priority date: 2019-06-11
Filing date: 2020-05-26
Publication date: 2022-01-14
Also published as: DE102019115774A1; WO2020249392A1

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 inlet (103), a pump chamber (P), an outlet (104) and a motor chamber (M), wherein an impeller (90) is arranged in the pump chamber (P), which impeller can be driven by a rotor (60) which is arranged in the motor chamber (M) and is connected in a rotationally fixed manner to the impeller (90), wherein the rotor (60) and/or the impeller (90) is mounted in a first bearing in the housing (10, 20, 30, 40), wherein the impeller (90) has, coaxially to its rotational axis, on the side facing the inlet (103), at least one pump chamber (903) surrounding the inlet, and the housing (10, 20, 30, 40) has, on the side facing the P) and coaxially to the rotational axis of the impeller (90), at least one pump chamber (903) surrounding the inlet At least one annular groove (104) surrounding the inlet, into which annular groove a rim (903) is inserted, or the impeller (90) has, on the side facing the inlet (103), at least one annular groove surrounding the inlet (103) coaxially to its axis of rotation and to the axis of rotation of the impeller (90), while the housing (10, 20, 30, 40) has at least one rim facing the pump chamber (P), surrounding the inlet, which rim is inserted into the annular groove, wherein the rim and the annular groove form a second bearing for supporting the impeller and/or the rotor.

Description

Pump, in particular for a liquid circuit in a vehicle, having an improved impeller support

Technical Field

The invention relates to a pump, in particular for a liquid circuit in a vehicle, for example a coolant pump, having a multi-part housing with an inlet, a pump chamber, an outlet and a motor chamber, wherein an impeller is arranged in the pump chamber and is driven by a rotor arranged in the motor chamber.

Background

Such a pump is known from the document DE 102011055599 a1 and from the german patent application with official document number DE 102018125031. It has a multi-body housing with a pump chamber, a motor chamber and an electronics chamber. An impeller is disposed within the pump chamber and is driven by a motor disposed within the motor chamber. An electrical circuit is provided in the electronics chamber, by means of which the motor can be controlled and/or regulated.

The impeller and the rotor of the motor are interconnected via a shaft. The shaft is guided through a wall of the housing, by means of which the pump chamber and the motor chamber are separated from each other. In the wall, a bearing bush is provided, in which the shaft, as well as the rotor and the impeller, are also rotatably supported.

In order to improve the support, the following solutions are known from the specialist literature: that is, on the side of the impeller facing the inlet, a rim is provided which projects into an inlet of circular cross-section, which inlet is arranged coaxially with the shaft. The rim may lead to an improved guidance of the rotating parts, i.e. the rotor, the shaft and the impeller. However, this solution has the disadvantage that, during operation of the pump, the liquid flowing into the pump chamber via the inlet starts to rotate due to the rim provided on the impeller. However, such rotation leads to a reduction in hydraulic efficiency, since the increase in swirl caused by the impeller in the case of liquid that has already started to rotate before entering the impeller channel is smaller than in the case of non-rotating or hardly rotating liquid.

A further disadvantage of the known seal is the liquid flow which can flow from the pump chamber to the inlet through the gap between the impeller and the housing and thus influence the efficiency of the pump.

Disclosure of Invention

The object of the invention is therefore to improve the mounting of the rotating parts of a pump of the type mentioned at the outset without reducing the hydraulic efficiency.

According to the invention, this object is achieved in that the impeller has, coaxially with its axis of rotation, on the side facing the inlet, at least one rim surrounding the inlet, while the housing has, coaxially with the axis of rotation of the impeller, on the side facing the pump chamber, at least one annular groove in which the rim engages; or the impeller has, on the side facing the inlet, at least one annular recess which surrounds the inlet, coaxially to the axis of rotation of the impeller and coaxially to the axis of rotation of the impeller, and the housing has at least one rim facing the pump chamber, which rim engages in the annular recess.

A seal is established between the inlet and the pump chamber due to the interfitting of the rim of the impeller with the annular groove of the housing or the interfitting of the rim of the housing with the annular groove of the impeller. The seal may be a labyrinth seal or similar. The seal reduces the liquid flow between the pump chamber and the inlet and increases the efficiency of the pump.

Since the rim of the impeller is not embedded in the inlet, but in the annular groove of the housing surrounding the inlet, or alternatively since the rim of the housing surrounding the inlet is embedded in the annular groove of the impeller, the pump according to the invention can have a second bearing for the rotating part of the pump, which assists the support of the rotating part of the pump. This second bearing leads to a smoother running of the rotating part and thus also to an improvement of the acoustic properties of the pump. The noise emission generated by the pump during its operation is smaller and/or more pleasant due to the second bearing.

The housing of the pump according to the invention can also have a wall which separates the pump chamber and the motor chamber from one another. The rotor or impeller of the pump according to the invention can comprise a shaft. The shaft can be rotatably supported in a bushing in a wall of the housing separating the pump chamber and the motor chamber, the bushing and the shaft can constitute a first bearing of the pump according to the invention. Additional bearings may be provided.

Drawings

The invention is explained in more detail below with reference to the description of the figures. The attached drawings are as follows:

figure 1 shows a perspective view of a pump,

FIG. 2 shows a longitudinal section through the pump in FIG. 1, an

Fig. 3 shows a longitudinal section as in fig. 2, but with arrows marking the path of the liquid through the pump.

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 top cover 40, wherein a stator 50 of the pump motor is arranged in the electronics housing 30. The pump motor is completed by a rotor 60, which is rotatably mounted on the motor housing 20 and into which the stator 50 is sunk. The stator 50 is again sunk into the motor housing 20. Furthermore, a circuit carrier 70 is provided, on which electronic circuits 80 are 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 lines 80 are arranged is delimited by the electronics housing 30 and the top cover 40 of the housing.

The housing parts can be made of plastic, for example Vyncolit. The stator 50 is injected into the electronics housing 30, preferably into a first wall 301, which is 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 top cover 40 and the electronics housing 30 as well as the electronics 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 web 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. As a result, expansion of the pump housing 10 and the motor housing 20 during operation of the pump, which occurs as a result of the pressure prevailing there, can be avoided or at least reduced.

The pump housing 10 and the wall 204 of the motor housing, i.e. the second wall through which the motor shaft 601 passes, enclose a pump chamber P in which the impeller 90 is located. The pump chamber P can be connected via the suction nipple 103 of the pump housing 10 to a line via which the liquid to be pumped is sucked. The suction attachment 103 is arranged coaxially with the rotational axis of the rotor 60.

The pump chamber P can be connected via the outlet nipple 104 to a pipe in which the pumped liquid is pressed. The outer wall of the pump housing 10 and the impeller 90 delimit a spiral space S which expands helically towards the outlet of the pump chamber. The impeller 90 is designed in a manner known per se, for example in the manner shown in fig. 2, 3 or 5 of the document DE 102011055599 a1, to which reference is made for a more detailed description of the impeller 90 that can be considered for the pump according to the invention.

The pump has an impeller 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 shaft projects into the pump housing 10.

The impeller 90 has a rim 903 on the side facing away from the motor housing 20. The rim 903 fits into an annular groove 106 in the pump housing 10. The annular groove 106 and the rim 903 have a larger diameter than the free cross-section of the inlet nipple 103. Thus, the rim 903 does not obstruct the flow of liquid from the inlet nipple 103 into the pump chamber P. Since the rim 903 sinks into the annular groove 106, the rim 903 does not come into contact with the inflowing liquid. Thus, the movement of the rim 903 does not affect the incoming liquid.

The rim 903 of the impeller 90 is guided in the annular groove 106 of the pump housing 10.

There is an internal or external annular gap between the rim 903 and the inner wall 108 of the annular groove 104 and between the rim 903 and the outer wall 107 of the annular groove 106. The rim 903 sunk into the annular recess 106 prevents the liquid flow from the suction nipple 103 to the outlet via the impeller 90. At most there is a small leakage flow possible via the annular gap.

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

In the wall 204, through which the rotor shaft 601 passes, which is already mentioned, a bushing 206 is provided, which serves as a bearing for the rotor shaft 601. A bushing 206 for supporting the rotor shaft is inserted into the already mentioned wall 204 and is connected securely to the remaining motor housing 20. The bushing 206 has a through hole with a cross section matching the rotor shaft 601. One or more grooves (not shown) can be provided in the wall of the through-hole in the axial direction, through which grooves, with the rotor shaft 601 inserted, liquid can flow between the pump chamber P and the motor chamber M delimited by the motor housing 20 and the baffle 301, and vice versa. A small amount of liquid guided through the groove 207 is entrained by the shaft 601 in the event of rotation of the rotor and ensures lubrication between the rotor shaft 601 and the bushing 206.

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

The annular chamber R is connected to the motor chamber M by one or more radial through holes 304 in the baffle 301. The through-hole 304 is disposed adjacent to the end wall 303. The liquid which has passed from the annular chamber R into the motor chamber M can be conveyed through the motor chamber M, for example through the gap between the rotor 60 and the baffle 301, to the side of the motor chamber M which faces the pump chamber P relative to the rotor 60.

In the case of the pump, a first through-hole 603 and a second through-hole 604 are provided between the shaft and the permanent magnet in the region of the rotor 60. A first through hole 603 extends parallel to the shaft 601 in a region immediately adjacent to the shaft 601. The second through hole 603 is radially further from the rotor shaft 601 and thus closer to the permanent magnets embedded in the rotor. Two types of through holes connect the space of the motor cavity on the first side of the rotor with the space of the motor cavity on the second side of the rotor.

Through the through

holes

603, 604 in the rotor 60, the through holes 209 in the wall 204 and the through holes 902 in the impeller 90, which have been mentioned and optionally provided in the bearing bushing 206 of the rotor shaft 601, are able to convey liquid to the inlet side of the impeller 90, i.e. the low pressure side of the impeller 90 (see fig. 3). Thus, there is a continuous connection from the spiral chamber S, i.e. the high-pressure side of the pump chamber P, via the through-hole 208 between the spiral chamber S and the annular chamber R into the annular chamber R, from there into the motor chamber M via the through-hole 304 between the annular chamber R and the motor chamber M, and from the motor chamber M via the through-

holes

603, 604 and optionally via the recess 207 in the bearing bushing 206, the through-hole 209 and the through-hole 902 in the bushing 901 of the impeller 90 to the outlet side of the impeller 90, i.e. the low-pressure side of the pump chamber P. During operation of the pump, a liquid flow is formed along this path, which, although being considerably smaller than the flow rate delivered by the pump into the outlet, is nevertheless sufficient to achieve sufficient cooling of the pump in the case of nominal operation.

List of reference numerals

10 pump casing

101 flange

102 contact piece

103 suction connection sleeve

104 outlet connection sleeve

106 annular groove

107 outer wall

108 inner wall

20 motor shell

201 first flange

203 annular groove

204 second wall

206 liner

207 groove

208 through hole

209 via hole

30 electronic device shell

301 baffle, first wall

303 end wall

304 through hole

40 Top cover

50 stator

60 rotor

601 rotor shaft

603 first via hole

604 second via

70 line carrier

80 line

90 impeller

901 liner

902 through hole

903 wheel rim

E electronic device cavity

P pump cavity

S spiral space

Claims

1. Pump, in particular for a liquid circuit in a vehicle, for example a coolant pump, having a multi-part housing (10, 20, 30, 40) with an inlet (103), a pump chamber (P), an outlet (104) and a motor chamber (M), wherein an impeller (90) is arranged in the pump chamber (P), which impeller can be driven by a rotor (60) which is arranged in the motor chamber (M) and is connected to the impeller (90) in a rotationally fixed manner, wherein the rotor (60) and/or the impeller (90) is/are mounted in a first bearing in the housing (10, 20, 30, 40),

it is characterized in that the preparation method is characterized in that,

the impeller (90) has, coaxially to the axis of rotation of the impeller, on the side facing the inlet (103), at least one rim (903) surrounding the inlet, while the housing (10, 20, 30, 40) has, coaxially to the axis of rotation of the impeller (90), on the side facing the pump chamber (P), at least one annular groove (104) surrounding the inlet, into which the rim (903) engages, or

The impeller (90) has, on the side facing the inlet (103), at least one annular recess which surrounds the inlet (103) coaxially to the axis of rotation of the impeller (90) and coaxially to the axis of rotation of the impeller, and the housing (10, 20, 30, 40) has, facing the pump chamber (P), at least one rim which surrounds the inlet and which engages in the annular recess.

2. A pump according to claim 1, wherein the rim and the annular recess constitute sealing means between the inlet and the pump chamber.

3. A pump according to claim 1 or 2, wherein the rim and the annular groove have a second bearing for supporting an impeller and/or a rotor.

4. A pump according to claim 1, characterized in that the housing (10, 20, 30, 40) has a wall (204) which separates the pump chamber (P) and the motor chamber (M) from each other.

5. A pump according to claim 2, characterized in that the rotor (60) comprises a shaft (601) or the impeller (90) comprises a shaft, wherein the shaft (601) is rotatably supported in a bushing (206) in a wall (204) of the housing separating the pump chamber (P) and the motor chamber (M), thereby constituting a first bearing.