liquid pump

Abstract

Fluid pump (100) comprising a pump housing (20), an impeller (30) arranged inside the pump housing (20) and a motor (40) which drives the impeller (30) to rotate in the pump housing (20), wherein the motor (40) comprises a tubular motor housing (41), a stator (42) fixed in the motor housing (41), a sleeve (43) arranged in the stator (42) and a rotor (44) rotatably arranged in the sleeve (43), characterized in that the sleeve (43) comprises a bottom section (431) and a side section (433) extending axially from an outer edge of the bottom section (431) towards the pump housing (20); wherein a metal stamping plate (45) is connected to the motor housing (41) and axially spaced from the bottom section (431) of the sleeve (43), wherein an annular sealing groove (459) is formed on the metal stamping plate (45); wherein an annular sealing element (50) is positioned in the sealing groove (459) and axially abuts both the metal stamping plate (45) and the bottom section (431) of the sleeve (43); wherein a printed circuit board (48) is in thermal contact with the metal stamping plate (45); wherein the bottom section (431) of the sleeve (43) is not closed, so that fluid in the sleeve (43) can flow into a space (62) which is surrounded by the metal stamping plate (45), the bottom section (431) of the sleeve (43) and the sealing element (50), thereby dissipating heat from the printed circuit board (48).

Description

AREA OF INVENTION

[0001] The invention relates to a pump, in particular a fluid pump. BACKGROUND OF THE INVENTION

[0002] Fluid pumps typically comprise an impeller and a motor that rotates the impeller. The motor has a stator and a rotor that can rotate relative to the stator. The rotor is connected to the impeller to cause it to rotate and facilitate fluid flow.

[0003] To prevent the fluid from compromising electrical safety, the motor's stator and rotor are separated by a sleeve, which is sealed by a cover and a sealing element positioned between them. In existing designs, the sealing element is typically placed on the base of the sleeve first, and then the sleeve is mounted onto the cover in the motor housing. After assembly, the sealing element is radially compressed and deformed to seal the sleeve to the cover. However, during the assembly of the sleeve into the motor housing, the sealing element can be twisted by axial force, which can impair the sealing effect and consequently compromise electrical safety. SUMMARY OF THE INVENTION

[0004] Against this background, a fluid pump is provided that can effectively solve the problem of fluid ingress into the stator.

[0005] A fluid pump comprising a pump housing, an impeller arranged within the pump housing, and a motor that drives the impeller to rotate within the pump housing, the motor comprising a tubular motor housing, a stator fixed in the motor housing, a sleeve arranged in the stator, and a rotor rotatably arranged in the sleeve, the sleeve comprising a bottom section and a side section extending axially from an outer edge of the bottom section to the pump housing; a stamped metal plate is connected to the motor housing and axially spaced from the bottom section of the sleeve, the stamped metal plate having an annular sealing groove; an annular sealing element is positioned in the sealing groove and rests axially against both the stamped metal plate and the bottom section of the sleeve; a printed circuit board is in thermal contact with the stamped metal plate;The bottom section of the sleeve is not closed, allowing fluid inside the sleeve to flow into a space surrounded by the metal stamping plate, the bottom section of the sleeve, and the sealing element, thereby dissipating heat from the circuit board.

[0006] Preferably, the motor housing is injection molded and integrally connected to the metal stamping plate.

[0007] Preferably, an inner wall and an outer wall are provided on the metal stamping plate, which are radially spaced apart to form the sealing groove between them, wherein the inner wall and the outer wall have one of the following structures: The inner wall and the outer wall are formed by bending the metal stamping plate; The inner and outer walls are injection-molded and firmly bonded to the metal stamping plate; The inner wall is formed by bending the metal stamping plate, and the outer wall is injection-molded and firmly bonded to the metal stamping plate; and The outer wall is formed by bending the metal stamping plate, and the inner wall is injection molded and firmly connected to the metal stamping plate.

[0008] Preferably, the inner wall is injection molded and integrally connected to the metal stamping plate.

[0009] Preferably, the inner wall has an annular main section and a connecting section extending inwards from the main section, with a convex-concave fitting structure provided between the metal stamping plate and the connecting section.

[0010] Preferably, an axial distance is formed between the outer wall and the bottom section of the sleeve, as well as between the inner wall and the bottom section of the sleeve.

[0011] Preferably, the motor housing extends inwards to form a positioning section that is connected to an outer edge of the metal stamping plate.

[0012] Preferably, the metal stamping plate has a bottom wall and a first side wall extending axially from an outer edge of the bottom wall towards the pump housing; the positioning section has a radial extension section extending inwards from the motor housing and an axial extension section extending axially from an inner edge of the radial extension section; The axial extension section encloses an inner circumferential surface of the first side wall, and an inner edge of the axial extension section forms the outer wall; or The axial extension section encloses an outer circumferential surface of the first side wall, and the first side wall forms the outer wall.

[0013] Preferably, the metal stamping plate further comprises a second side wall extending radially outwards from one end of the first side wall, wherein the second side wall is connected to the radial extension section of the positioning section.

[0014] Preferably, the bottom section of the sleeve has a fluid channel that is located radially inside the sealing element and connects a space inside the sleeve and the space surrounded by the metal stamping plate, the bottom section of the sleeve and the sealing element.

[0015] Preferably the sleeve is a plastic sleeve, wherein a shaft seat is formed on the bottom section of the sleeve, wherein a motor shaft is fixed in the shaft seat and the rotor of the motor is rotatably suspended on the motor shaft; or wherein a motor shaft is rotatably arranged in the shaft seat and the rotor is rigidly suspended on the motor shaft to rotate synchronously relative to the stator.

[0016] Preferably the shaft seat has a through shaft hole, wherein the motor shaft passes through the shaft hole and extends into the space surrounded by the metal stamping plate, the bottom section of the sleeve and the sealing element, wherein a flow channel is formed in the motor shaft which allows fluid to flow off the metal stamping plate along the flow channel.

[0017] Preferably, the bottom section of the sleeve extends outwards towards the metal stamping plate to form an annular contact section that rests axially against the sealing element.

[0018] Preferably, an inner wall and an outer wall are provided on the metal stamping plate, which are radially spaced apart to form the sealing groove between them, wherein the inner wall consists of two superimposed metal plates formed by bending the metal stamping plate.

[0019] Preferably the annular sealing groove is circular, elliptical or polygonal, and the annular sealing element is circular, elliptical or polygonal.

[0020] In contrast to the prior art, the fluid pump described in the present disclosure forms a sealing groove on the metal stamping plate, allowing the sealing element to be pre-assembled into the sealing groove before the sleeve is mounted. This prevents the sealing element from twisting during sleeve assembly, thus ensuring a good seal. The fluid in the sleeve can penetrate the space between the metal stamping plate, the bottom section of the sleeve, and the sealing element, thereby cooling the circuit board without fluid reaching the stator, thus maintaining electrical safety. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a schematic diagram of a fluid pump according to an embodiment of the present disclosure. Fig. 2 shows a top view of the in Fig. 1 fluid pump shown. Fig. Figure 3 shows a sectional view along line III-III in Fig. 2. Fig. Figure 4 shows an enlarged view of Section IV in Fig. 3. Fig. 5 shows an exploded view of the in Fig. 1 fluid pump shown. Fig. Figure 6 shows a sectional view of a motor housing from the in Fig. 5 fluid pump shown. Fig. Figure 7 shows another exploded view of the engine housing of the [product name] Fig. 5 fluid pump shown. Fig. Figure 8 shows another view of the in Fig. 7. Metal stamping plate shown from a different perspective. Fig. Figure 9 shows another view of the sleeve of the in Fig. 5 fluid pump shown. Fig. Figure 10 shows a schematic diagram of a fluid pump according to a further embodiment of the present disclosure. Fig. Figure 11 shows a sectional view of the Fig. 10 shown assembled metal stamping plate and motor housing. Fig. Figure 12 shows a schematic representation of the in Fig. 11 shown metal stamping plate. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0021] To facilitate understanding of this disclosure, a more comprehensive description is given below with reference to the corresponding accompanying drawings. The drawings illustrate by way of example one or more embodiments of this disclosure, thereby making the understanding of the technical solutions disclosed herein more precise and thorough. It is understood, however, that this disclosure can be implemented in various forms and is not limited to the embodiment described below.

[0022] In the accompanying drawings to this disclosure, identical or similar reference numerals correspond to identical or similar components. It is understood that in this disclosure, terms such as "top," "bottom," "left," and "right" are used to indicate positional or directional relationships based on the orientations or positions shown in the drawings. These terms are used solely for the convenience of simplifying the description of this disclosure and do not mean or imply that the devices or elements mentioned have a particular orientation or must be designed and operated in a particular orientation. Therefore, the terminology used to describe the positional relationships in the drawings is for illustrative purposes only and should not be construed as limiting the patent.The specific meanings of the aforementioned terms can be understood by experts based on the specific circumstances.

[0023] When the embodiments of this disclosure contain descriptions such as "first," "second," etc., these descriptions are for illustrative purposes only and should not be interpreted as indicating or implying their relative meaning or as implicitly specifying the set of technical features mentioned. Therefore, features defined as "first," "second," etc., may explicitly or implicitly include at least one such feature. Wherever "and / or" appears in the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or the solution in which both A and B are satisfied.

[0024] Furthermore, the technical solutions of different embodiments can be combined, but this must be based on the condition that such combinations can be realized by those skilled in the art in this field. If the combination of technical solutions leads to contradictions or is not feasible, it should be assumed that such a combination does not exist and is not within the scope of protection of the present disclosure.

[0025] The present disclosure relates to a fluid pump for driving fluids, such as water, coolant, etc., in order to make them flow in pipes. Fig. Figures 1 to 3 show a specific embodiment of a fluid pump of the present disclosure. The illustrated fluid pump 100 comprises a pump housing 20, an impeller 30 arranged in the pump housing 20, and a motor 40 that drives the impeller 30 to rotate it in the pump housing 20.

[0026] The impeller 30 is disc-shaped and rotatably mounted in the center of the pump housing 20. The diameter of the impeller 30 is slightly smaller than the inner diameter of the pump housing 20, resulting in a small radial gap between the two after assembly. This gap allows the impeller 30 to rotate freely within the pump housing 20. The pump housing 20 is provided with an inlet 22 and an outlet 24 corresponding to the impeller 30 for connecting external pipes and forming a fluid flow path. It is understood that the positions, numbers, etc., of the inlet 22 and outlet 24 can be customized as required and are not limited to the illustrated embodiment.

[0027] See also Fig. 5: The motor 40 is an internal rotor motor comprising a motor housing 41, a stator 42 fixed in the motor housing 41, a sleeve 43 arranged in the stator, and a rotor 44 rotatably arranged in the sleeve 43. The impeller 30 is preferably integrally connected to the rotor 44 by injection molding.

[0028] The motor housing 41 is tubular, with one end (e.g., the upper end) connected to the pump housing 20 and the other end (e.g., the lower end) to the stamped metal plate 45. The stamped metal plate 45 is preferably manufactured by stamping from materials such as stainless steel, which offers advantages such as simple shaping, high strength, and low cost. An annular sealing groove 459 is formed on the stamped metal plate 45 for securing an annular first sealing element 50.

[0029] It should be noted that the term "annular" in this disclosure includes a circular ring, an elliptical ring, a polygonal ring such as a square ring, a hexagonal ring, an octagonal ring, etc., as long as it is closed in the circumferential direction to enclose the space it surrounds. The shape of the first sealing element 50 corresponds to the shape of the sealing groove 459. In the illustrated embodiment, both the first sealing element 50 and the sealing groove 459 are circular. The cross-section of the first sealing element 50 is preferably circular, but can also be elliptical, polygonal, or another shape.

[0030] The sealing groove 459 is formed between an annular inner wall and an outer wall, the outer wall being arranged radially outside the inner wall and spaced apart from it. As shown in the Fig. As shown in Figures 6-7, in this embodiment both the inner wall and the outer wall are injection-molded components that are integrally connected to the metal stamping plate 45. In other embodiments, the inner wall and the outer wall can also be attached to the metal stamping plate 45 after injection molding by screws, adhesives, etc.

[0031] In a specific embodiment, as in the Fig. As shown in Figures 7-8, the metal stamping plate 45 comprises a circular bottom wall 451, a first side wall 452 extending axially upward from an outer edge of the bottom wall 451, and a second side wall 453 extending radially outward from an end of the first side wall 452. Preferably, the motor housing 41 extends radially inward to form a positioning section 46. The metal stamping plate 45 is connected to the positioning section 46 and thus to the motor housing 41.

[0032] In particular, during the injection molding of the motor housing 41, the metal stamping plate 45 can be pre-inserted into a mold. After the motor housing 41 has been molded, the positioning section 46 of the motor housing 41 is integrally connected to the metal stamping plate 45.

[0033] In this embodiment, the positioning section 46 has a radial extension section 461 that extends radially inward from the motor housing 41, and an axial extension section 463 that extends axially from an inner edge of the radial extension section 461. The second side wall 453 of the metal stamping plate 45 is embedded in the radial extension section 461 of the positioning section 46. The axial extension section 463 encloses an inner circumferential surface of the first side wall 452, thus increasing the connection strength between the motor housing 41 and the metal stamping plate 45. In the illustrated embodiment, an inner edge of the axial extension section 463 of the positioning section 46 forms the outer wall.

[0034] Preferably, the axial extension section 463 encloses the entire inner circumferential surface of the first side wall 452 of the metal stamping plate 45, its end being integrally connected to the outer edge of the bottom wall 451 of the metal stamping plate 45, thereby further improving the connection strength between the motor housing 41 and the metal stamping plate 45 and simultaneously increasing the strength of the metal stamping plate 45 at its first side wall 452.

[0035] In some embodiments, the axial extension section 463 of the positioning section 46 of the motor housing 41 can also be formed on an outer surface of the first side wall 452 of the metal stamping plate 45, which can also improve the strength of the metal stamping plate 45 at its first side wall 452. In this case, the axial extension section 463 encloses an outer circumferential surface of the first side wall 452. The first side wall 452 of the metal stamping plate 45 forms the outer wall of the sealing groove 459. That is, the outer wall is formed by bending the metal stamping plate 45 during the stamping process.

[0036] As in the Fig. 6 and Fig. As shown in Figure 7, the inner wall 47 in this embodiment is an annular component. During the injection molding of the inner wall 47, the metal stamping plate 45 can be pre-inserted into a mold. After the inner wall 47 is formed, it is integrally joined to an inner surface of the bottom wall 451 of the metal stamping plate 45. Preferably, the inner surface of the bottom wall 451 projects to form a convex section 454, which is enclosed by the inner wall 47, thereby increasing the contact area and the bond strength between the inner wall 47 and the bottom wall 451. The convex section 454 can be present singly or multiple times and is preferably formed integrally during the stamping process of the metal stamping plate 45, with an outer surface of the bottom wall 451 forming a concave section 455 at a position corresponding to the convex section 454, which further simplifies the process.

[0037] In this embodiment, the inner wall 47 comprises an annular main section 471 and several connecting sections 473 extending inwards from the main section 471. Corresponding to the shape of the first sealing element 50, the main section 471 is preferably circular; in other embodiments, it could also be elliptical, polygonal, etc. The connecting sections 473 are spaced apart along the circumferential direction of the main section 471, with each connecting section 473 enclosing a convex section 454.

[0038] In some embodiments, the bottom wall 451 of the metal stamping plate 45 can have a convex section 454 at the position corresponding to the main section 471, whereby the main section 471 and the convex section 454 interact to achieve a better connection strength between the inner wall 47 and the metal stamping plate 45, thus eliminating the need for the connecting section 473. In some embodiments, convex sections 454 can be provided separately at positions corresponding to the main section 471 and the connecting sections 473.

[0039] In some embodiments, the inner surface of the bottom wall 451 of the metal stamping plate 45 can also form a concave section, wherein the connecting section 473 of the inner wall 47 is embedded in the concave section, thereby increasing the contact area and the connection strength with the bottom wall 451.

[0040] In this embodiment, after the metal die-cutting plate 45 has been formed by stamping, the motor housing 41 and the inner wall 47 are formed onto the metal die-cutting plate 45 by injection molding, creating an inseparable integral structure. It should be noted that the motor housing 41 and the inner wall 47 can be formed simultaneously or separately by two injection molding processes; this embodiment does not restrict this. After the motor housing 41 and the inner wall 47 have been formed, a sealing groove 459 is formed on the metal die-cutting plate 45 to receive the first sealing element 50.

[0041] As in the Fig. 5 and Fig. As can be seen in Figure 9, the sleeve 43 is a cylindrical structure arranged in the motor housing 41. In particular, the sleeve 43 has a bottom section 431, a side section 433 extending axially upwards (i.e., towards the pump housing 20) from an outer edge of the bottom section 431, and a flange 435 extending radially outwards from an upper end of the side section 433.

[0042] The flange 435 is arranged axially between the upper end of the motor housing 41 and an outer edge of the pump housing 20, preferably as shown in Fig. As can be seen in Figure 3, a second sealing element 52 is arranged between the flange 435 and the upper end of the motor housing 41, and a third sealing element 54 is arranged between the flange 435 and an outer edge of the pump housing 20, whereby the flange 435 of the sleeve 43 is sealedly connected to the motor housing 41 and the pump housing 20.

[0043] As in the Fig. 3 and Fig. As shown in Figure 9, the side section 433 of the sleeve 43 is arranged coaxially with the motor housing 41. The side section 433 and the motor housing 41 are radially spaced apart to form a first chamber 61 for receiving the stator 42 of the motor 40. The bottom section 431 of the sleeve 43 is located near the bottom wall 451 of the metal stamping plate 45, with a small axial gap formed between the bottom section 431 and the metal stamping plate 45 to create a second chamber 62. The provision of the first sealing element 50 isolates the second chamber 62 from the first chamber 61.Since the first sealing element 50 is pre-inserted into the sealing groove 459 of the metal stamping plate 45, it is not twisted during the installation of the sleeve 43, thus ensuring an effective seal between the bottom section 431 of the sleeve 43 and the metal stamping plate 45, which prevents fluid from flowing from the second chamber 62 into the first chamber 61 and improves the electrical safety of the motor 40.

[0044] Preferably, there is an axial distance between the outer wall and the bottom section 431 of the sleeve 43, as well as between the inner wall 47 and the bottom section 431 of the sleeve 43, in order to prevent the sleeve 43 from abutting the first sealing element 50 due to restrictions by the outer wall and the inner wall 47.

[0045] An interior space of the sleeve 43 serves as a third chamber 63 for receiving the rotor 44 of the motor 40; an interior space of the pump housing 20 serves as a fourth chamber 64 for receiving the impeller 30. The bottom section 431 of the sleeve 43 is not closed, allowing fluid in the sleeve 43 to flow into the second chamber 62 to perform heat exchange with the metal stamping plate 45. In this embodiment, the bottom section 431 of the sleeve 43 has a fluid channel 437 positioned radially within the first sealing element 50 to connect the third chamber 63 and the second chamber 62. Preferably, there are several fluid channels 437 spaced apart along the circumferential direction of the bottom section 431.

[0046] The motor 40 also has a printed circuit board 48 which is in thermal contact with the stamped metal plate 45. The thermal contact has a direct contact and an indirect contact, which can effect heat conduction as long as the heat from the printed circuit board 48 can be effectively conducted through the bottom wall 451 to the fluid in the second chamber 62. In this embodiment, the printed circuit board 48 is arranged on the outer surface of the bottom wall 451 of the stamped metal plate 45. Preferably, a thermally conductive medium 56 is filled between the printed circuit board 48 and the bottom wall 451 to improve the thermal conductivity.

[0047] Preferably, the fluid pump 100 further comprises an end cover 49 which is connected to the lower end of the motor housing 41 and forms a fifth space 65 between the end cover 49, the motor housing 41 and the metal stamping plate 45 to accommodate and protect the circuit board 48 and thus further ensure electrical safety.

[0048] In this embodiment, the sleeve 43 is preferably a plastic sleeve. The lower section 431 of the sleeve 43 is formed with a shaft seat 438. The motor shaft 58 is secured in the shaft seat 438, and the rotor 44 of the motor 40 is rotatably mounted on the motor shaft 58. The sleeve 43 could be injection-molded, and one end of the motor shaft 58 is integrally attached to the shaft seat 438 during the molding process. Preferably, a further shaft seat 26 is formed in the center of the pump housing 20 to accommodate the other end of the motor shaft 58. In some embodiments, the motor shaft 58 can also be a rotatable shaft that rotates with the rotor 44 relative to the stator 42. In this case, the motor shaft 58 is rotatably mounted in the shaft seat 438.

[0049] In this embodiment, a through-hole is formed in the shaft seat 438, through which one end of the motor shaft 58 can be passed to extend into the second chamber 62. As in Fig. As shown in Figure 3, a flow channel 59 is formed in the motor shaft 58, connecting the second chamber 62 with the third chamber 63 and the fourth chamber 64, allowing fluid to flow from the second chamber 62 back into the third chamber 63 and the fourth chamber 64, thereby dissipating heat from the circuit board 48. In the illustrated embodiment, the flow channel 59 penetrates the axial ends of the motor shaft 58. In other embodiments, the number, shape, etc., of the flow channel 59 can be designed as required, as long as they allow fluid to flow back, without being limited to specific embodiments.

[0050] As in Fig. As can be seen in Figure 4, an outer surface of the bottom section 431 of the sleeve 43 extends axially outwards towards the metal stamping plate 45 to form an annular contact section 439. During assembly of the sleeve 43, the contact section 439, corresponding to the sealing groove 459, presses the first sealing element 50 downwards, causing it to deform under pressure and clamp axially between the contact section 439 of the sleeve 43 and the bottom wall 451 of the metal stamping plate 45, thereby creating an effective seal between the first chamber 61 and the second chamber 62. Similarly, the contact section 439 is preferably circular, although in other embodiments it could also be elliptical, polygonal, etc.

[0051] In the present disclosure, a metal stamping plate 45 is produced by stamping, wherein a sealing groove 459 is formed on the metal stamping plate 45. Before the assembly of the sleeve 43, the first sealing element 50 can be pre-installed in the sealing groove 459, so that the first sealing element 50 is only pressed and deformed during the insertion of the sleeve 43 without twisting, thereby enabling a tight fit between the bottom wall 451 of the metal stamping plate 45 and the lower section 431 of the sleeve 43, thus forming effective insulation between the first chamber 61 and the second chamber 62. Fluid in the sleeve 43 can enter the second chamber 62 to dissipate heat from the circuit board 48 without entering the first chamber 61, thereby effectively ensuring the operational reliability of the motor 40.

[0052] The Fig.Figures 10 to 12 show a fluid pump 100a according to a further embodiment of the present disclosure. The main difference between the fluid pump 100a and the fluid pump 100 in the previous embodiment relates to the metal stamping plate 45a. In this embodiment, the metal stamping plate 45a also includes a circular bottom wall 451a. The difference is that by bending the central section of the bottom wall 451a during the stamping of the metal stamping plate 45a, an annular inner wall 47a is formed. The inner wall 47a has two superimposed metal plates. That is, in this embodiment, the inner wall 47a and the metal stamping plate 45a form an integral structure, which further simplifies manufacturing.In this embodiment, the metal stamping plate 45a can further have a first side wall 452a extending axially from an outer edge of the bottom wall 451a, and a second side wall 453a extending radially outwards from an end of the first side wall 452a.

[0053] In this embodiment, the lower end of the motor housing 41 is also preferably formed with a positioning section 46, which comprises a radial extension section 461 and an axial extension section 463. The axial extension section 463 surrounds the first side wall 452a of the stamped metal plate 45a, and the second side wall 453a is embedded in the radial extension section 461, thereby firmly connecting the stamped metal plate 45a to the motor housing 41. The first sealing element 50 is positioned in a sealing groove 459a, which is formed between the axial extension section 463 and the inner wall 47a and bears axially against both the bottom wall 451a of the stamped metal plate 45a and the bottom section 431 of the sleeve 43.

[0054] In some embodiments, the axial extension section 463 of the positioning section 46 of the motor housing 41 can also be formed on an outer surface of the first side wall 452a of the metal stamping plate 45a, thereby also increasing the strength of the metal stamping plate 45a at its first side wall 452a. In this case, the axial extension section 463 encloses an outer circumferential surface of the first side wall 452a, with the first side wall 452a of the metal stamping plate 45 forming the outer wall. That is, the outer wall is also formed by bending the metal stamping plate 45 during the stamping process.

[0055] In some embodiments, the motor housing 41 may lack an axial extension section 463 and even a positioning section 46, whereby the connection with the metal stamping plate 45a is achieved through its own structure. Both the outer and inner walls are formed by bending the metal stamping plate 45a during the stamping process.

[0056] It should be noted that the embodiments mentioned above represent only the preferred embodiments of the present disclosure; the descriptions are specific and detailed, but should not be interpreted as limitations of the present disclosure. It should be pointed out that various modifications and improvements can be made by those skilled in the art without departing from the concept of the present disclosure, such as combinations of different features in the various embodiments, all of which should fall within the scope of protection of the present disclosure.

Claims

[1] Fluid pump (100) comprising a pump housing (20), an impeller (30) arranged inside the pump housing (20) and a motor (40) which drives the impeller (30) to rotate inside the pump housing (20), wherein the motor (40) comprises a tubular motor housing (41), a stator (42) fixed in the motor housing (41), a sleeve (43) arranged in the stator (42) and a rotor (44) rotatably arranged in the sleeve (43), characterized by , that the sleeve (43) comprises a bottom section (431) and a side section (433) extending axially from an outer edge of the bottom section (431) towards the pump housing (20); wherein a metal stamping plate (45) is connected to the motor housing (41) and axially spaced from the bottom section (431) of the sleeve (43), wherein an annular sealing groove (459) is formed on the metal stamping plate (45); wherein an annular sealing element (50) is positioned in the sealing groove (459) and axially abuts both the metal stamping plate (45) and the bottom section (431) of the sleeve (43); wherein a printed circuit board (48) is in thermal contact with the metal stamping plate (45); wherein the bottom section (431) of the sleeve (43) is not closed, so that fluid in the sleeve (43) can flow into a space (62) which is surrounded by the metal stamping plate (45), the bottom section (431) of the sleeve (43) and the sealing element (50), thereby dissipating heat from the printed circuit board (48). [2] Fluid pump according to claim 1, characterized by , that the motor housing (41) is injection molded and integrally connected with the metal stamping plate (45). [3] Fluid pump according to claim 1 or 2, characterized by , that an inner wall (47, 47a) and an outer wall are provided on the metal stamping plate (45) and are radially spaced apart to form the sealing groove (459) between them, wherein the inner wall (47, 47a) and the outer wall have one of the following structures: the inner wall (47a) and the outer wall are formed by bending the metal stamping plate (45); the inner wall (47) and the outer wall are injection-molded and firmly connected to the metal stamping plate (45); The inner wall (47a) is formed by bending the metal stamping plate (45), and the outer wall is injection-molded and firmly connected to the metal stamping plate (45); and the outer wall is formed by bending the metal stamping plate (45) and the inner wall (47) is injection molded and firmly connected to the metal stamping plate (45). [4] Fluid pump according to claim 3, characterized by , that the inner wall (47) is injection molded and integrally connected to the metal stamping plate (45). [5] Fluid pump according to claim 4, characterized by , that the inner wall (47) comprises an annular main section (471) and a connecting section (473) extending inwards from the main section (471), with a convex-concave fitting structure (454) provided between the metal stamping plate (45) and the connecting section (473). [6] Fluid pump according to claim 3, characterized by , that an axial distance is formed between the outer wall and the bottom section (431) of the sleeve (43) as well as between the inner wall (47, 47a) and the bottom section (431) of the sleeve (43). [7] Fluid pump according to any one of the preceding claims, characterized by , that the motor housing (41) extends inwards to form a positioning section (46) which is connected to an outer edge of the metal stamping plate (45). [8] Fluid pump according to claim 7, characterized by, that the metal stamping plate (45) comprises a bottom wall (451) and a first side wall (452) extending axially from an outer edge of the bottom wall (451) towards the pump housing (20); wherein the positioning section (46) comprises a radial extension section (461) extending inwards from the motor housing (41) and an axial extension section (463) extending axially from an inner edge of the radial extension section (461); wherein the axial extension section (463) encloses an inner circumferential surface of the first side wall (452) and an inner edge of the axial extension section (463) is formed as an outer wall; or wherein the axial extension section (463) encloses an outer circumferential surface of the first side wall (452) and the first side wall (452) is designed as an outer wall. [9] Fluid pump according to claim 8, characterized by, that the metal stamping plate (45) further comprises a second side wall (453) extending radially outwards from an end of the first side wall (452), the second side wall (453) being connected to the radial extension section (461) of the positioning section (46). [10] Fluid pump according to any one of the preceding claims, characterized by , that the bottom section (431) of the sleeve (43) has a fluid channel (437) which is located radially inside the sealing element (50) and connects a space (63) inside the sleeve (43) with the space (62) surrounded by the metal stamping plate (45), the bottom section (431) of the sleeve (43) and the sealing element (50). [11] Fluid pump according to any one of the preceding claims, characterized by that the sleeve (43) is a plastic sleeve, wherein a shaft seat (438) is formed on the lower section (431) of the sleeve (43), wherein a motor shaft (58) is fixed in the shaft seat (438) and the rotor (44) of the motor (40) is rotatably suspended on the motor shaft (58); or a motor shaft (58) is rotatably arranged in the shaft seat (438) and the rotor (44) is fixedly suspended on the motor shaft (58) to rotate synchronously relative to the stator (42). [12] Fluid pump according to claim 11, characterized by , that the shaft seat (438) has a through shaft hole, wherein the motor shaft (58) passes through the shaft hole and extends into the space surrounded by the metal stamping plate (45), the bottom section (431) of the sleeve (43) and the sealing element (50), wherein a flow channel (59) is formed in the motor shaft (58) which allows fluid on the metal stamping plate (45) to flow along the flow channel (59). [13] Fluid pump according to any of the preceding claims, characterized by, that the bottom section (431) of the sleeve (43) extends outwards towards the metal stamping plate (45) to form an annular contact section (439) which rests axially against the sealing element (50). [14] Fluid pump according to any one of the preceding claims, characterized by , that the inner wall (47a) and the outer wall are provided on the metal stamping plate (45) and are radially spaced apart to form the sealing groove (459) between them, wherein the inner wall (47a) consists of two superimposed metal plates formed by bending the metal stamping plate (45). [15] Fluid pump according to any one of the preceding claims, characterized by , that the annular sealing groove (459) is circular, elliptical or polygonal and the annular sealing element (50) is circular, elliptical or polygonal.

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