CN110873060A

CN110873060A - Pump body

Info

Publication number: CN110873060A
Application number: CN201810995720.4A
Authority: CN
Inventors: 梁冠殷; 邹国渊; 陈安邦; 曾德涅; 秦锐锋
Original assignee: Johnson Electric International AG
Current assignee: Johnson Electric International AG
Priority date: 2018-08-29
Filing date: 2018-08-29
Publication date: 2020-03-10

Abstract

The invention relates to a pump body, which comprises a pump shell and a pump wheel accommodated in the pump shell, wherein the pump wheel is provided with a pump wheel inlet positioned at a rotation center and a pump wheel outlet positioned at the periphery of the pump wheel; the pump body further comprises an annular sealing member arranged between the pump shell inlet and the pump wheel inlet, the sealing member is provided with a through hole for communicating the pump shell inlet and the pump wheel inlet, and the sealing member is positioned at a gap between the pump shell and the pump wheel to block fluid from flowing from the pump wheel outlet to the pump wheel inlet through the gap. The invention can reduce or avoid the fluid flowing from the pump wheel outlet to the pump wheel inlet through the gap between the pump wheel and the pump shell, thereby improving the efficiency of the pump body.

Description

Pump body

[ technical field ] A method for producing a semiconductor device

The invention relates to a pump body which can be used as a water pump.

[ background of the invention ]

As shown in fig. 1 and 2, a conventional water pump 100 includes a motor 20, a pump impeller 50 driven by a motor shaft 22, and a pump housing 40 mounted to the motor 20 and housing the pump impeller 50. When the impeller 50 rotates, a low pressure region 52 is formed at the axial center and a high pressure region 54 is formed at the outer periphery. Accordingly, the pump casing 40 has an inlet 42 in communication with the low pressure region 52 and an outlet 44 in communication with the high pressure region 54. In this manner, as the impeller 50 rotates, external fluid enters the low pressure region 52 of the impeller 50 via the inlet 42 and then exits the outlet 44 via the high pressure region 54 under the drive of the impeller 50.

In order to allow the pump wheel 50 to rotate relative to the pump housing 40, a clearance 60 must exist between the pump wheel 50 and the pump housing 40. Thus, a portion of the fluid in the high pressure region 54 will return to the low pressure region 52 through the gap 60, which backflow reduces the efficiency of the water pump and may increase the operational noise of the water pump. However, in order to allow the pump 50 to rotate relative to the pump housing 40, a gap 60 must necessarily exist between the pump 50 and the pump housing 40. Those skilled in the art are constantly striving to improve the pump housing 40 and the pump impeller 50 to improve the efficiency and reduce the operating noise of the water pump.

[ summary of the invention ]

It is an object of the present invention to improve the efficiency of the pump body.

The pump body comprises a pump shell and a pump wheel accommodated in the pump shell, wherein the pump wheel is provided with a pump wheel inlet positioned at a rotation center and a pump wheel outlet positioned at the periphery of the pump wheel, and the pump shell is provided with a pump shell inlet and a pump shell outlet which are respectively communicated with the pump wheel inlet and the pump wheel outlet; the pump body further comprises an annular sealing member arranged between the pump shell inlet and the pump wheel inlet, the sealing member is provided with a through hole for communicating the pump shell inlet and the pump wheel inlet, and the sealing member is positioned at a gap between the pump shell and the pump wheel to block fluid from flowing from the pump wheel outlet to the pump wheel inlet through the gap.

As an improvement, the pump body further includes a motor connected to the pump housing, the motor includes a stator and a rotor rotatably mounted to the stator, the stator is fixed to the pump housing, the rotor has a rotating shaft, the pump impeller is connected to the rotating shaft, and the stator provides a rotational support for the rotating shaft.

As a refinement, the seal comprises a friction ring mounted on the pump casing around the inlet of the pump casing and a spacing ring mounted on the pump wheel around the inlet of the pump wheel, and a sealing friction pair is formed between the friction ring and the spacing ring.

As a refinement, the pump wheel has a flange at the pump wheel inlet, and the spacer ring is fitted on the flange.

As an improvement, the pump wheel comprises a bottom plate, a cover plate opposite to and spaced from the bottom plate, and a plurality of blades connected between the bottom plate and the cover plate, the pump wheel inlet is formed in the cover plate, and the flange is convexly arranged on one side of the cover plate, which faces away from the blades.

In one refinement, the pump housing forms an annular mounting groove at an inlet of the pump housing, and the friction ring is mounted in the annular mounting groove.

As an improvement, the spacer ring has a peripheral wall and an end portion disposed at one end of the peripheral wall, the peripheral wall is clamped to the annular flange, and the end portion abuts against the friction ring.

As a modification, the end portion has a flat plate shape.

As a modification, the spacer ring is axially and circumferentially retained by the pump wheel, so that the rotating shaft is rotatably supported in the pump case sequentially through the friction ring, the spacer ring, and the pump wheel.

As an improvement, the end part is a conical surface or hemispherical friction ring, and a conical surface or hemispherical accommodating space is correspondingly formed for accommodating the end part.

As a refinement, the rotational support provided by the stator for the rotary shaft is realized by means of a bearing only.

As a modification, the bearing supports an end of the rotating shaft away from the pump wheel.

As a refinement, the bearing is a bushing made of graphite or ceramic material.

In a further development, the friction ring is made of graphite or a ceramic material and the spacer ring is made of plastic or stainless steel.

According to the embodiment of the invention, the fluid can be reduced or prevented from flowing from the pump wheel outlet to the pump wheel inlet through the gap between the pump wheel and the pump shell, and the efficiency of the pump body is improved.

[ description of the drawings ]

FIG. 1 is a schematic view of a prior art pump body;

FIG. 2 is a longitudinal cross-sectional view of the pump body shown in FIG. 1;

FIG. 3 is a schematic view of one embodiment of a pump body provided by the present invention;

FIG. 4 is a schematic section A-A of the pump body of FIG. 3;

FIG. 5 is an exploded view of the pump body of FIG. 3;

FIG. 6 is a schematic view of a seal used with the pump body shown in FIG. 3;

FIG. 7 is a schematic view of a pump wheel used with the pump body shown in FIG. 3;

FIG. 8 is a schematic view of another embodiment of the pump body provided by the present invention;

FIG. 9 is a schematic view of a seal used with the pump body shown in FIG. 8;

fig. 10 is an exploded view of the seal of fig. 9.

[ detailed description ] embodiments

The invention is further described below with reference to the figures and examples.

Referring to fig. 3-5, in one embodiment of the present invention, the pump body 200 includes a pump housing 40, a motor 20 connected to the pump housing 40, and a pump impeller 50 housed in the pump housing 40 and driven by the motor 20. The pump housing 40 has a pump housing inlet 42 and a pump housing outlet 44. The motor 20, when operated, rotates the impeller 50, forcing external fluid into the pump body 200 from the pump housing inlet 42 and out the pump housing outlet 44.

In the present embodiment, the motor 20 is an inner rotor motor, and includes a rotor 21 and a stator 31, and the rotor 21 is rotatably mounted to the stator 31. The housing 33 of the stator 31 has a cylindrical shape with one open end, and the open end is engaged with the pump housing 40 to form a cavity together with the pump housing 40 for mounting the rotor 21, the pump impeller 50, and the like. In this embodiment, an end cover 35 is installed at the open end of the casing 33, the end cover 35 is located in a cavity formed by the casing 33 and the pump housing 40, and divides the cavity into a pump cavity 48 (see fig. 4) and a motor cavity 38 (see fig. 4), wherein the pump wheel 50 is installed in the pump cavity 48, and the rotor 21 is installed in the motor cavity 38.

The rotor 21 has a rotation shaft 22, and the rotation shaft 22 is supported by

bearings

24 and 26 mounted at the bottom of the housing 33 and the end cover 35, respectively, so that the rotor 21 can rotate relative to the stator 31. One end of the shaft 22 also passes from the motor cavity 38 through the end cap 35 and into the pump cavity 48 to mount the impeller 50. In the present embodiment, the

bearings

24 and 26 are bushings made of a low-friction material such as graphite or ceramic. It will be appreciated that the

bearings

24 and 26 may be other types of ball bearings.

The impeller 50 is a centrifugal impeller having an impeller inlet 52 at the center of rotation and an impeller outlet 54 at the outer periphery of the impeller. The pump wheel inlet 52 and the pump wheel outlet 54 are in communication with the pump housing inlet 42 and the pump housing outlet 44, respectively. When the motor 20 is operated to rotate the impeller 50, the impeller outlet 54 forms a low pressure region, and external fluid enters the impeller 50 through the pump housing inlet 42 and the impeller inlet 52 and exits through the impeller outlet 54 and the pump housing outlet 44.

The pump body 200 further includes an annular seal 70 disposed between the pump housing inlet 42 and the pump wheel inlet 52, the seal 70 having a through hole communicating the pump housing inlet 42 and the pump wheel inlet 52. A seal 70 is located at the gap 60 between the pump housing 40 and the impeller 50 to block fluid flow from the impeller outlet 54 to the impeller inlet 42 via the gap 60, thereby improving the efficiency of the pump body 200.

Referring to fig. 5-7, the seal 70 includes a friction ring 90 and a spacer ring 80 rotatable relative to the friction ring 90. A friction ring 90 is mounted to the inner wall of the pump housing 40 and a spacer ring 80 is mounted to the impeller 50 and surrounds the impeller inlet 52. In this embodiment, the pump casing 40 defines an annular mounting groove 46 at the pump casing inlet 42, and the annular mounting groove 46 mounts a friction ring 90 such that the friction ring 90 is axially and circumferentially restrained by the annular mounting groove 46.

In this embodiment, the impeller 50 includes a base plate 51, a cover plate 55 spaced apart from and opposite the base plate 51, and a plurality of vanes 53 connected between the base plate 51 and the cover plate 55. The pump inlet 52 is formed in the center of the cover plate 55, and the pump outlet 54 is formed in the outer periphery of the pump 50 between the bottom plate 51 and the cover plate 55. The base plate 51 is formed with a boss portion 59 to be fixedly fitted to the rotary shaft 22, and the rotary shaft 22 drives the pump 50 as a drive shaft. The cover plate 55 has an annular flange 57 at the pump wheel inlet 52. The spacer ring 80 has a cylindrical peripheral wall 87 and a flat plate-like end 82 provided at one end of the peripheral wall 87 (see fig. 6). When the spacer ring 80 is installed, the spacer ring 80 is sleeved on the annular flange 57, so that the peripheral wall 87 of the spacer ring 80 is tightly clamped on the circumferential side surface of the annular flange 57, and the end 82 of the spacer ring 80 abuts against the end of the annular flange 57. In this manner, the spacer ring 80 is axially and circumferentially retained by the annular flange 57. In this embodiment, as shown in FIG. 6, the side of the friction ring 90 facing the spacer ring 80 has grooves 92 for storing lubricating fluid, thereby providing an inflow of lubricating fluid to the friction ring 90 to prevent complete dry grinding of the contact surface between the friction ring 90 and the spacer ring 80, which is particularly suitable for graphite friction rings 90.

In this embodiment, the friction ring 90 is made of a material with a low friction coefficient, such as graphite or ceramic. The spacer ring 80 is made of plastic or stainless steel or ceramic and has a smooth surface. It is understood that in various embodiments, the materials of friction ring 90 and spacer ring 80 may be selected from any two compatible materials for friction seals that are compatible with mechanical design practices, such as ceramic-graphite, metal-ceramic. When installed, the end 82 of the spacer ring 80 maintains a slight clearance against the end face of the friction ring 90 or both for ease of installation. When the water pump works, the impeller 50 is pushed upwards, namely towards the pump shell inlet 42, so that the spacing ring 80 is driven to abut against the friction ring 90, and a sealing friction pair with a low friction coefficient is formed between the friction ring 90 and the spacing ring 80.

In another embodiment, as shown in fig. 8-10, the friction ring 90 and the spacer ring 80 are in tapered contact, specifically, the axial end 82 of the spacer ring 80 toward the friction ring 90 is tapered. Accordingly, the friction ring 90 forms a conical receiving space adjacent to the spacer ring 80 to receive the conical end 82. In this manner, the spacer ring 80 is axially and circumferentially restrained by the friction ring 90. This design enables the pump housing 40 to rotatably support the rotary shaft 22 through the friction ring 90, the spacer ring 80, and the pump impeller 50 in sequence. Therefore, no bearing may be installed at the end cap 35 to support the rotation shaft 22. That is, the rotation of the rotary shaft 22 can be supported in common only by the friction ring 90 (first bearing) attached to the pump housing 40 and the bearing 24 (second bearing) attached to the bottom of the stator housing 33.

In another alternative, the axial end 82 is a hemispherical surface, and the friction ring 90 forms a hemispherical receiving space to receive the conical end 82, which also can limit the axial and circumferential limits of the friction ring 90 on the spacer ring 80.

The above examples merely represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications, such as combinations of different features in various embodiments, may be made without departing from the spirit of the invention, and these are within the scope of the invention.

Claims

1. A pump body comprises a pump shell and a pump wheel accommodated in the pump shell, wherein the pump wheel is provided with a pump wheel inlet positioned at a rotation center and a pump wheel outlet positioned at the periphery of the pump wheel; the pump body is characterized by further comprising an annular sealing piece arranged between the pump shell inlet and the pump wheel inlet, the sealing piece is provided with a through hole for communicating the pump shell inlet and the pump wheel inlet, and the sealing piece is located at a gap between the pump shell and the pump wheel to block fluid from flowing from the pump wheel outlet to the pump wheel inlet through the gap.

2. The pump body of claim 1, further comprising a motor coupled to the pump housing, the motor including a stator and a rotor rotatably mounted to the stator, the stator being secured to the pump housing, the rotor having a shaft, the impeller being coupled to the shaft, the stator providing rotational support to the shaft.

3. The pump body of claim 2, wherein the seal includes a friction ring mounted to the pump casing around a pump casing inlet and a spacer ring mounted to the impeller around the impeller inlet, the friction ring and the spacer ring forming a sealed friction pair therebetween.

4. The pump body of claim 3, wherein the impeller has a flange at the impeller inlet, the spacer ring being sleeved over the flange.

5. The pump body according to claim 4, wherein the impeller includes a base plate, a cover plate spaced from and opposite the base plate, and a plurality of vanes connected between the base plate and the cover plate, the impeller inlet being formed in the cover plate, and the flange being raised on a side of the cover plate facing away from the vanes.

6. The pump body of claim 3, wherein the pump casing forms an annular mounting groove at the pump casing inlet, the friction ring being mounted within the annular mounting groove.

7. The pump body of claim 4, wherein the spacer ring has a peripheral wall and an end disposed at one end of the peripheral wall, the peripheral wall being clamped against the annular flange, the end being clamped against the friction ring.

8. The pump body according to claim 7, characterized in that said end portion is flat.

9. The pump body of claim 7, wherein the spacer ring is axially and circumferentially retained by the pump wheel such that the shaft is rotatably supported to the pump housing by the friction ring, the spacer ring, and the pump wheel in sequence.

10. The pump body according to claim 9, wherein the end portion is a conical surface or a hemispherical surface friction ring, and a conical surface or hemispherical surface receiving space is correspondingly formed to receive the end portion.

11. The pump body according to claim 9, characterized in that the rotational support provided by the stator to the rotary shaft is achieved by means of only one bearing.

12. The pump body of claim 11, wherein the bearing supports an end of the shaft distal from the impeller.

13. The pump body according to claim 11 or 12, characterized in that said bearings are bushings made of graphite or ceramic material.

14. The pump body according to any one of claims 3 to 12, wherein the friction ring is made of graphite or ceramic material and the spacer ring is made of plastic or stainless steel.