Fluid pump

Abstract

A fluid pump comprises a shell, an impeller and a motor, the impeller and the motor are arranged in the shell, the motor drives the impeller to rotate, the motor comprises a stator, a motor shaft and a rotor located in the stator, and the motor further comprises a shaft seat located in the stator. The base plate is located on the outer side in the radial direction and extends in the radial direction of the motor, the first ring part is located on the inner side in the radial direction and extends in the axial direction of the motor, the second ring part is connected between the first ring part and the base plate, a shaft hole is formed in the first ring part, and the motor shaft is fixed in the shaft hole. The rotor rotates around the motor shaft, the second ring part extends from the first ring part to the substrate in a gradually expanding manner, an included angle is formed between the second ring part and the first ring part, and the included angle ranges from 15 degrees to 35 degrees. The shaft seat provided by the utility model has higher strength, is not easy to damage in the use process, and provides stable support for the motor shaft.

Description

Technical Field

[0001] The utility model relates to a fluid pump, in particular to a cooling pump. Background Art

[0002] Generally, a fluid pump is composed of an impeller and a motor driving the impeller to rotate, wherein the motor includes a stator and a rotor rotatable relative to the stator, and the impeller is connected to the rotor to rotate with the rotor, thereby driving the fluid to flow.

[0003] To prevent the fluid from affecting electrical safety, the stator and rotor of the motor are separated by a sleeve. In the existing structure, the sleeve is an injection-molded cylindrical structure, and the motor shaft is fixed at the center of the bottom of the sleeve. The rotor of the motor is accommodated in the sleeve and rotatably sleeved on the motor shaft, and the stator is fixed outside the sleeve. Both ends of the motor shaft need a shaft seat for support. However, the shaft seat on the side away from the impeller is usually subject to greater stress, which can easily lead to damage to the shaft seat. Utility Model Content

[0004] In view of this, a fluid pump having a shaft seat with higher strength is provided.

[0005] A fluid pump comprises a casing, an impeller arranged in the casing, and a motor, wherein the motor drives the impeller to rotate, the motor comprises a stator, a motor shaft, and a rotor sleeved on the motor shaft and located in the stator, the motor further comprises a shaft seat located in the stator, the shaft seat is used to fix the motor shaft, comprises a base plate located in the radial outside and extending in the radial direction of the motor, a first ring portion located in the radial inside and extending in the axial direction of the motor, and a second ring portion connected between the first ring portion and the base plate, an axial hole is provided in the first ring portion, the motor shaft is fixed in the axial hole, the rotor rotates around the motor shaft, the second ring portion extends in a gradually expanding shape from the radial outside of the first ring portion toward the radial inside of the base plate, the second ring portion is inclined relative to the first ring portion, an angle is formed between the second ring portion and the first ring portion, and the angle is between 15 degrees and 35 degrees.

[0006] Preferably, the first ring portion is divided into a first section and a second section in the axial direction with the connection point between the outer circumferential surface of the first ring portion and the outer circumferential surface of the second ring portion as the boundary, the first section is located outside the second ring portion, the second section is located in the center of the second ring portion, and the ratio of the axial length of the second section to the first section is between 0.5 and 2.

[0007] Preferably, a connection between the second ring portion and the substrate has a chamfer, and the radius of the chamfer is between 2 mm and 4 mm.

[0008] Preferably, a sleeve is provided in the housing, the sleeve is located between the stator and the rotor, and the shaft seat is integrally formed with an end of the sleeve away from the impeller, or is installed in an end of the sleeve away from the impeller.

[0009] Preferably, the sleeve includes an axially extending annular side plate, one axial end of the annular side plate is open, and the other axial end is connected to the radial outer side of the base plate of the shaft seat, and the shaft seat is integrally formed at the other axial end of the sleeve to close the other axial end of the sleeve.

[0010] Preferably, heat-conducting glue is filled between the first ring portion and the second ring portion of the shaft seat, and the fluid pump further comprises a circuit board, which is located on a side of the shaft seat away from the impeller and is in thermal contact with the shaft seat.

[0011] Preferably, the sleeve includes an axially extending annular side plate, one axial end of the annular side plate is open, and the other axial end is connected to the radial outer side of the base plate of the shaft seat, the shaft seat is integrally formed at the other axial end of the sleeve, and the base plate of the shaft seat is formed with a connecting hole penetrating the base plate to facilitate the passage of fluid, a bottom cover is provided on the shaft seat or the sleeve to close the other axial end of the sleeve, and a space for accommodating fluid is provided between the bottom cover and the shaft seat.

[0012] Preferably, the sleeve is a plastic sleeve, and the shaft seat is a plastic shaft seat.

[0013] Preferably, the sleeve is a metal sleeve, which includes a circular bottom plate and an annular side plate extending axially from the radial outer edge of the circular bottom plate, and the shaft seat is installed on the circular bottom plate of the metal sleeve or near the circular bottom plate.

[0014] Preferably, the shaft seat further includes a support wall extending axially from the radial outer side of the base plate to the circular bottom plate of the sleeve, the circumferential outer wall surface of the support wall abuts against the annular side plate of the sleeve, and a through connecting hole is provided on the base plate of the shaft seat, so that the fluid can reach the circular bottom plate of the sleeve through the connecting hole.

[0015] Preferably, the motor shaft is a hollow shaft, so that the fluid passing through the communicating hole of the base plate of the shaft seat flows into the hollow shaft and flows along the hollow shaft.

[0016] Preferably, a plurality of protrusions are formed on the circumferential outer wall surface of the support wall, and the plurality of protrusions are distributed at intervals along the circumference of the support wall so as to be tightly fitted and fixed with the annular side plate of the sleeve.

[0017] Compared with the prior art, the structure of the shaft seat of the fluid pump provided by the utility model can improve the strength of the shaft seat, is not easily damaged during use, and provides stable support for the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a fluid pump according to an embodiment of the utility model.

[0019] Figure 2 for Figure 1 A top view of the fluid pump is shown.

[0020] Figure 3 for Figure 2 The fluid pump is shown in a cross-sectional view along line III-III.

[0021] Figure 4 for Figure 3 Magnified view of middle circle IV.

[0022] Figure 5 for Figure 1 Exploded view of the fluid pump shown.

[0023] Figure 6 for Figure 5 A cross-sectional view of a sleeve in a fluid pump is shown.

[0024] Figure 7 Another angle view of the sleeve.

[0025] Figure 8 It is a schematic diagram of a sleeve of a fluid pump according to another embodiment of the utility model.

[0026] Fig. 9 for Figure 8 A cross-sectional view of the sleeve is shown.

[0027] Fig.10 for Figure 8 Exploded view of the sleeve shown.

[0028] Fig.11 for Fig.10 Another angled view of the sleeve within the sleeve shown.

[0029] Fig.12 It is a schematic diagram of a sleeve of a fluid pump according to yet another embodiment of the utility model.

[0030] Fig.13 for Fig.12 A cross-sectional view of the sleeve is shown.

[0031] Fig.14 for Fig.12 Schematic diagram of the shaft seat in the sleeve shown. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings exemplarily show one or more embodiments of the present invention so that the understanding of the technical solution disclosed in the present invention is more accurate and thorough. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments described below.

[0033] The same or similar numbers in the drawings of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B.

[0035] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The utility model provides a fluid pump used for driving fluids such as water, coolant and the like. Figure 1-5 The figure shows a specific embodiment of the fluid pump of the present invention. The fluid pump 100 includes a housing, an impeller 20 disposed in the housing, and a motor 30. The motor 30 drives the impeller 20 to rotate.

[0037] like Figure 3 , Figure 5As shown, the motor 30 is an inner rotor motor, including a motor housing 31, a stator 32 fixed in the motor housing 31, and a rotor 34 rotatably disposed in the stator 32. The impeller 20 is connected to the rotor 34, so that it can rotate with the rotor 34 under the drive of the motor 30. In this embodiment, the motor housing 31 includes a stator housing 312 and an end cover 314, wherein the stator housing 312 is a cylindrical structure, and a space is formed inside to accommodate the stator 32, etc.; the pump housing 10 is connected to one side end (such as the top end) of the stator housing 312, and the end cover 314 is connected to the other side end (such as the bottom end) of the stator housing 312, and the pump housing 10 and the motor housing 31 (including the stator housing 312 and the end cover 314) together constitute the housing of the fluid pump 100. The housing of the present utility model is not limited to the above. For example, in other embodiments, the housing may also include only the pump housing 10 and the end cover 314, and one of the pump housing 10 and the end cover 314 is further formed with a cylindrical portion for accommodating the motor 30; or, the pump housing 10 and the end cover 314 are further formed with a cylindrical portion for accommodating part of the motor 30, and the motor 30 is jointly accommodated, thereby omitting the stator housing 312.

[0038] like Figure 3 As shown, in this embodiment, the stator 32 is fixed in the stator shell 312, including a stator core 321, an insulating frame 323 wrapped on the stator core 321, and a coil 325 wound on the insulating frame 323. The stator 32 may further include a circuit board 327, and an external power supply provides current to the coil 325 through the circuit board 327, so that the rotor 34 rotates, thereby driving the impeller 20 connected thereto to rotate. The rotor 34 includes a rotor core 341, a permanent magnet 343, and a rotor shell 345 for fixing the rotor core 341 and the permanent magnet 343, wherein the permanent magnet 343 is attached to the outer peripheral surface of the core 341. In other embodiments, an assembly hole may also be provided in the core 341 to plug the permanent magnet 343.

[0039] The impeller 20 is disposed in the pump housing 10, and is in the shape of a disk as a whole, and its diameter is slightly smaller than the inner diameter of the pump housing 10. After assembly, a small gap is formed between the two in the radial direction, so that the impeller 20 can rotate freely in the pump housing 10. To simplify the illustration, the specific structure of the impeller 20 is not shown in the drawings. The pump housing 10 is provided with an inlet 12 and an outlet 13 corresponding to the impeller 20, which are used to connect with an external pipeline to form a flow path for the fluid. The impeller 20 and the rotor housing 345 can be an integral structure of injection molding, or they can be separately molded and then assembled together.

[0040] like Figure 5-7As shown, a sleeve 50 is provided in the fluid pump 100 for isolating the stator 32 and the rotor 34 of the motor 30. In the present embodiment, a shaft seat 60 is formed at the bottom of the sleeve 50 for fixing the motor shaft. The rotor 34 of the motor 30 is rotatably sleeved on the motor shaft 36. In the present embodiment, the sleeve 50 is preferably a plastic sleeve, and the shaft seat 60 is preferably a plastic shaft seat. The sleeve 50 and the shaft seat 60 can be integrally formed on the motor shaft 36. When the sleeve 50 and the shaft seat 60 are injection molded, the motor shaft 36 can be pre-placed in the mold, and after the injection molding is completed, the motor shaft 36 is integrally fixed in the shaft seat 60, which can not only ensure the tightness of the connection, but also simplify the subsequent assembly process. In some embodiments, after the sleeve 50 and the shaft seat 60 are injection molded, the motor shaft 36 can be plugged and fixed in the shaft seat 60 by tight fit or the like.

[0041] The sleeve 50 is a cylindrical structure as a whole, and includes an annular side plate 54 extending in the axial direction and a flange 56 extending radially outward from the end of the side plate 54. The side plate 54 includes a first side end and a second side end opposite to each other in the axial direction. Figure 6-7 In the illustrated embodiment, the first side end of the sleeve 50 is open, and the second side end is closed by the shaft seat 60. The shaft seat 60 is integrally formed at the second side end of the sleeve 50. During assembly, the annular side plate 54 of the sleeve 50 is placed in the stator 32, with the open first side end facing the pump housing 10 and the closed second side end facing the end cover 314. The flange 56 of the sleeve 50 is sandwiched between the pump housing 10 and the stator housing 312 in the axial direction, dividing the internal space of the fluid pump 100 into a relatively independent first space 15 and a second space 16.

[0042] like Figure 3 As shown, the first space 15 is located between the sleeve 50 and the pump housing 10, and is used to assemble the rotor 34 and the impeller 20 of the motor 30; the second space 16 is located between the sleeve 50, the stator housing 312 and the end cover 314, and is used to assemble the stator 32 of the motor 30. The fluid flows only in the first space 15, which effectively prevents the fluid from corroding the electronic devices in the second space 16, such as the coil 325 and the circuit board 327 of the stator 32. Preferably, a first sealing ring 80 is provided between the flange 56 of the sleeve 50 and the pump housing 10 to ensure the sealing of the first space 15; a second sealing ring 82 is provided between the flange 56 and the stator housing 312, and a third sealing ring 84 is provided between the stator housing 312 and the end cover 314 to ensure the sealing of the second space 16, further improving the safety of the motor 30 and the entire fluid pump 100.

[0043] like Figure 4 , Figure 6As shown, the shaft seat 60 includes a base plate 61 located radially outside and extending along the radial direction of the motor, a first ring portion 62 located radially inside and extending along the axial direction of the motor 30, and a second ring portion 64 connected between the first ring portion 62 and the base plate 61, wherein the radial outer side of the base plate 61 is connected to the second side end of the side plate 54.

[0044] The first ring portion 62 is a columnar structure, and a shaft hole 621 is formed in the center for fixing the motor shaft 36; the second ring portion 64 is a conical structure, extending from the radial outer side of the first ring portion 62 to the radial inner side of the base plate 61 in a gradually expanding shape. In the radial inner direction toward the base plate 61, the diameter of the second ring portion 64 gradually increases, so that the second ring portion 64 is inclined relative to the first ring portion 62, and an angle α is formed between the two, and the angle α is preferably 15 to 35 degrees. The above structure can effectively improve the strength of the shaft seat 60 and provide strong support for the motor shaft 36.

[0045] Preferably, the first ring portion 62 can be divided into two sections in the axial direction with the connection point between the outer circumference of the first ring portion 62 and the outer circumference of the second ring portion 64 as the boundary, wherein the first section is located outside the second ring portion 64 and relatively far away from the base plate 61; the second section is located in the center of the second ring portion 64 and relatively close to the base plate 61. Preferably, the ratio of the axial length L2 of the second section to the axial length L1 of the first section is in the range of 0.5 to 2, so that the overall strength of the shaft seat 60 can be further improved, making it less likely to deform, and further strengthening the support for the motor shaft 36.

[0046] Preferably, the connection between the second ring portion 64 and the base plate 61 is chamfered, and the radius R of the chamfer is between 2 mm and 4 mm, so that the connection is smooth and the strength of the shaft seat 60 is further improved.

[0047] Preferably, the wall thickness D1 of the substrate 61 is appropriately reduced to be less than or equal to the wall thickness D2 of the second ring portion 64, that is, D1≤D2, thereby improving the thermal conductivity of the substrate 61, so that the heat of the circuit board 327 is more effectively conducted to the fluid in the sleeve 50 through the substrate 61, and then dissipated outward through the flow of the fluid.

[0048] In this embodiment, the circuit board 327 is located between the sleeve and the end cover 314. To facilitate heat dissipation of the circuit board 327, the electronic components are arranged on the side of the circuit board 327 away from the shaft seat 60. Figure 4 As shown, thermal conductive adhesive 86 can be filled between the circuit board 327 and the shaft seat 60, including between the outer side surface 631 of the circuit board 327 and the substrate 61, the axial outer end surface 623 of the first ring portion 62, the outer peripheral surface of the second section of the first ring portion 62, and the inner peripheral surface of the second ring portion 64, so as to improve the heat conduction effect between the two.

[0049] Figure 8-11The sleeve of the fluid pump of another embodiment of the utility model is shown, and the second side end of the annular side plate 54a of the sleeve 50a is integrally formed with a shaft seat 60a. The sleeve 50a of this embodiment is preferably a plastic sleeve, and the shaft seat 60a is preferably a plastic shaft seat. The shaft seat 60a includes a base plate 61a located on the radial outside and extending radially, a first ring portion 62a located on the radial inside and extending axially, and a second ring portion 64a connected between the first ring portion 62a and the base plate 61a. The motor shaft 36a is fixed in the shaft hole 621a of the first ring portion 62a. The structures of the sleeve 50a, the base plate 61a, the first ring portion 62a, and the second ring portion 64a of the shaft seat 60a of this embodiment are substantially the same as those of the sleeve 50 and the shaft seat 60 of the aforementioned embodiment, and the same contents are not repeated here. The main difference between the sleeve 50a and the shaft seat 60a and the sleeve 50 and the shaft seat 60 of the aforementioned embodiment is that a through-hole 613a is provided on the base plate 61a of the shaft seat 60a, so that the second side end of the sleeve 50a is not sealed.

[0050] A bottom cover 58a is provided on the shaft seat 60a or the sleeve 50a, and is used to close the second side end of the sleeve 50a. Preferably, a sealing ring (not shown) is provided between the bottom cover 58a and the shaft seat 60a or the sleeve 50a to enhance the sealing effect between the two, so that the fluid in the first space 15 will not leak into the second space 16. There is a space for accommodating the fluid between the bottom cover 58a and the shaft seat 60a, so that the fluid reaches the bottom cover 58a through the connecting hole 613a. The side of the bottom cover 58a facing away from the sleeve 50a is in thermal contact with the circuit board 327, and a thermal conductive adhesive can be filled between the two. Preferably, the material of the bottom cover 58a is a high thermal conductivity material such as metal.

[0051] Preferably, there may be a plurality of connecting holes 613 a on the substrate 61 a , which are spaced apart along the circumference of the substrate 61 a , so that the fluid can reach the bottom cover 58 a more efficiently, thereby taking away the heat of the circuit board 327 .

[0052] Preferably, the motor shaft 36a is a hollow shaft, and the shaft seat 60a is spaced from the bottom cover 58a in the axial direction, and the shaft hole of the motor shaft 36a is connected to the fluid on the bottom cover 58a, so that the fluid can flow along the hollow motor shaft 36a to promote fluid circulation.

[0053] Figure 12-14 The figure shows a sleeve of a fluid pump of another embodiment of the utility model, wherein the metal sleeve 50b comprises a circular bottom plate 52b, an annular side plate 54b extending axially from the outer edge of the circular bottom plate 52b, and a flange 56b extending radially outward from the end of the side plate 54b. The sleeve 50b is preferably a metal sleeve, and a shaft seat 60b is installed on the circular bottom plate 52b or near the circular bottom plate 52b. The shaft seat 60b can be a metal shaft seat or a plastic shaft seat.

[0054] The shaft seat 60b includes a base plate 61b located on the radial outer side and extending in the radial direction, a first ring portion 62b located on the radial inner side and extending in the axial direction, and a second ring portion 64b connected between the first ring portion 62b and the base plate 61b. The motor shaft 36b is fixed in the shaft hole 621b of the first ring portion 62b. The structure of the base plate 61b, the first ring portion 62b and the second ring portion 64b of the shaft seat 60b of this embodiment is substantially the same as that of the shaft seat 60 of the aforementioned embodiment, and the same contents are not repeated here. The main difference between the shaft seat 60b of this embodiment and the shaft seat 60 of the aforementioned embodiment is that the base plate 61b is no longer integrally formed with the sleeve 50b, but is installed in the metal sleeve 50b, and a through-hole 613b is provided on the base plate 61b.

[0055] Preferably, the shaft seat 60b further includes a support wall 66b extending axially from the radial outer side of the base plate 61b toward the circular bottom plate 52b of the sleeve 50b. The provision of the support wall 66b, on the one hand, can form a space for accommodating fluid between the base plate 61b of the shaft seat 60b and the circular bottom plate 52b of the sleeve 50b, and on the other hand, can increase the contact area between the shaft seat 60b and the annular side plate 54b of the sleeve 50b, so that the shaft seat 60b is more firmly fixed to the bottom of the sleeve 50b.

[0056] Preferably, there are multiple communicating holes 613b provided on the substrate 61b, so that the fluid can reach the circular bottom plate 52b of the sleeve 50b through the shaft seat 60b, thereby taking away the heat of the circuit board 327. Preferably, the motor shaft 36b is a hollow shaft, and the motor shaft 36b and the shaft seat 60b are spaced apart from the circular bottom plate 52b of the sleeve 50b in the axial direction, and the shaft hole of the motor shaft 36b is connected with the fluid on the circular bottom plate 52b, so that the fluid flows along the hollow motor shaft 36b, promoting the circulation of the fluid.

[0057] The circumferential outer wall of the support wall 66b of the shaft seat 60b abuts against the side plate 54b of the sleeve 50b, and the shaft seat 60b is fixed to the circular bottom plate 52b of the sleeve 50b or a position close to the circular bottom plate 52b. Preferably, the circumferential outer wall surface of the support wall 66b is formed with protrusions 661b, which can be convex blocks, convex strips, convex points, etc., and are distributed at intervals along the circumference of the support wall 66b and are tightly matched and fixed with the side plate 54b.

[0058] It should be noted that the above embodiments only express the preferred implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as a limitation of the present invention. For example, the structure described in the above embodiments is that the shaft seat and the sleeve are integrally formed or installed in the sleeve, but it is only a preferred embodiment of the present invention. The present invention focuses on protecting the structure of the shaft seat for supporting the motor shaft, and the shaft seat can exist independently of the sleeve. In some embodiments, the fluid pump may not have a sleeve, such as when the stator is packaged and sealed, in which case the shaft seat can be fixed separately to the inner side of the stator or integrally formed with the housing; alternatively, the sleeve of the fluid pump can be a sleeve with openings at both ends, and the shaft seat can be formed on a bottom cover for sealing the opening at the bottom end of the sleeve, and so on.

[0059] It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, such as combining different features in various embodiments, etc., which should all fall within the scope of protection of the present invention.

Claims

1. A fluid pump, comprising a housing, an impeller disposed in the housing, and a motor, wherein the motor drives the impeller to rotate, and the motor comprises a stator, a motor shaft, and a rotor sleeved on the motor shaft and located in the stator, wherein: The motor further includes a shaft seat located in the stator, the shaft seat is used to fix the motor shaft, including a base plate located on the radial outside and extending along the radial direction of the motor, a first ring portion located on the radial inside and extending along the axial direction of the motor, and a second ring portion connected between the first ring portion and the base plate, the first ring portion is provided with an axial hole, the motor shaft is fixed in the axial hole, the rotor rotates around the motor shaft, the second ring portion extends in a gradually expanding shape from the radial outside of the first ring portion toward the radial inside of the base plate, the second ring portion is inclined relative to the first ring portion, and an angle is formed between the second ring portion and the first ring portion, and the angle is between 15 degrees and 35 degrees.

2. The fluid pump according to claim 1, characterized in that The first ring portion is divided into a first section and a second section in the axial direction with the connection point between the outer circumferential surface of the first ring portion and the outer circumferential surface of the second ring portion as the boundary, the first section is located outside the second ring portion, and the second section is located at the center of the second ring portion, and the ratio of the axial length of the second section to the first section is between 0.5 and 2.

3. The fluid pump according to claim 1, characterized in that: A connection between the second ring portion and the substrate has a chamfer, and the radius of the chamfer is between 2 mm and 4 mm.

4. The fluid pump according to claim 1, characterized in that: A sleeve is provided in the housing, and the sleeve is located between the stator and the rotor. The shaft seat is integrally formed at an end of the sleeve away from the impeller, or is installed at an end of the sleeve away from the impeller.

5. The fluid pump according to claim 4, characterized in that: The sleeve includes an axially extending annular side plate, one axial end of the annular side plate is open, and the other axial end is connected to the radial outer side of the base plate of the shaft seat, and the shaft seat is integrally formed at the other axial end of the sleeve to close the other axial end of the sleeve.

6. The fluid pump according to claim 5, characterized in that The space between the first ring portion and the second ring portion of the shaft seat is filled with heat-conducting glue. The stator further comprises a circuit board, which is located at a side of the shaft seat away from the impeller and is in heat-conducting contact with the shaft seat.

7. The fluid pump according to claim 4, characterized in that: The sleeve includes an axially extending annular side plate, one axial end of the annular side plate is open, and the other axial end is connected to the radial outer side of the base plate of the shaft seat, the shaft seat is integrally formed at the other axial end of the sleeve, and the base plate of the shaft seat is formed with a connecting hole penetrating the base plate to facilitate the passage of fluid, a bottom cover is provided on the shaft seat or the sleeve to close the other axial end of the sleeve, and a space for accommodating fluid is provided between the bottom cover and the shaft seat.

8. The fluid pump according to any one of claims 5 to 7, characterized in that: The sleeve is a plastic sleeve, and the shaft seat is a plastic shaft seat.

9. The fluid pump according to claim 4, characterized in that: The sleeve is a metal sleeve, which includes a circular bottom plate and an annular side plate extending axially from the radial outer edge of the circular bottom plate. The shaft seat is installed on the circular bottom plate of the metal sleeve or at a position close to the circular bottom plate.

10. The fluid pump according to claim 9, characterized in that The shaft seat further includes a support wall extending axially from the radial outer side of the base plate to the circular bottom plate of the sleeve, the circumferential outer wall surface of the support wall abuts against the annular side plate of the sleeve, and a through connecting hole is provided on the base plate of the shaft seat, so that the fluid can reach the circular bottom plate of the sleeve through the connecting hole.

11. The fluid pump according to claim 7 or 10, characterized in that: The motor shaft is a hollow shaft, so that the fluid passing through the communicating hole of the base plate of the shaft seat flows into the hollow shaft and flows along the hollow shaft.

12. The fluid pump according to claim 10, characterized in that A plurality of convex portions are formed on the circumferential outer wall surface of the support wall, and the plurality of convex portions are distributed at intervals along the circumference of the support wall so as to be tightly fitted and fixed with the annular side plate of the sleeve.

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