Fluid pump

Abstract

A kind of fluid pump, including pump shell, pump wheel rotatably configured in the pump shell and motor driving the pump wheel rotation in the pump shell, the motor includes motor shell, sleeve configured in the motor shell, stator with coil being wound between the sleeve and the motor shell, circuit board with the coil electric connection of the stator and rotor assembled in the sleeve, the pump wheel is connected with the rotor;The pump shell includes the main body portion of ring sleeve the motor shell and the cover body connected to the end of the main body portion, the circuit board is in heat contact with the outer wall surface of the pump shell, the first space for fluid flow is formed between the pump shell and the motor shell, the heat of the circuit board and stator can be conducted to the fluid in the first space by the pump shell and dissipate, overall heat dissipation effect is better, effectively guarantee electrical safety.

Description

Technical Field

[0001] This utility model relates to pumps, and more particularly to a fluid pump. Background Technology

[0002] Pumps are typically installed in pipelines to transport fluids such as coolants and fuel gases. For example, pumps can be used in the thermal management systems of data center servers to deliver coolant for heat dissipation.

[0003] Typically, a fluid pump consists of a pump impeller and an electric motor that drives the pump impeller to rotate. The electric motor includes a stator, a rotor that can rotate relative to the stator, and a sleeve that separates the stator and the rotor. The bottom end of the sleeve protrudes outward to form a bearing seat to support the motor shaft. The stator of the motor is sleeved outside the sleeve, and the rotor of the motor is assembled in the sleeve and sleeved on the motor shaft. The pump impeller is connected to the rotor to rotate with it, driving the fluid to flow between the pump impeller and the rotor.

[0004] In the fluid pump with the above structure, the separation of the sleeve can effectively prevent the fluid from eroding the stator. However, this makes it difficult for the heat generated by the motor during operation, especially the heat generated by its circuit board, to be conducted to the fluid through the sleeve for dissipation, which affects electrical safety. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a fluid pump that can quickly dissipate the heat generated by its motor during operation, thereby ensuring electrical safety.

[0006] A fluid pump includes a pump housing, a pump impeller rotatably disposed in the pump housing, and a motor for driving the pump impeller to rotate in the pump housing. The motor includes a motor housing, a sleeve disposed in the motor housing, a stator with coils wound around it and housed between the sleeve and the motor housing, a circuit board electrically connected to the coils of the stator, and a rotor assembled in the sleeve. The pump impeller is connected to the rotor. The pump housing includes a main body portion surrounding the motor housing and a cover portion connected to the end of the main body portion. The circuit board is in thermal contact with the outer wall surface of the pump housing. A first space for fluid flow is formed between the pump housing and the motor housing. The heat of the circuit board can be dissipated through the pump housing to the fluid in the first space.

[0007] The fluid pump may exhibit one or more of the following features, either individually or in combination.

[0008] Optionally, the cover includes a first cover and a second cover respectively disposed at both axial ends of the main body, the pump wheel being disposed in the second cover, and the circuit board being in thermal contact with the outer wall surface of the main body or the first cover. Optionally, the circuit board is located on the axially outer side of the pump housing and is in thermal contact with the outer wall surface of the first cover.

[0009] Optionally, the circuit board is located on the axial outer side of the pump housing and is in thermal contact with the outer wall surface of the first cover.

[0010] Optionally, the circuit board is located radially outward of the pump housing and is in thermal contact with the outer wall surface of the main body.

[0011] Optionally, the main body includes an arc-shaped plate and a flat plate connected to each other, and the circuit board is in thermal contact with the outer wall surface of the flat plate.

[0012] Optionally, the first cover has an inlet and the second cover has an outlet.

[0013] Optionally, both the inlet and the outlet extend radially along the fluid pump; or, the inlet extends radially along the fluid pump and the outlet extends tangentially along the fluid pump.

[0014] Optionally, the second cover body forms a vortex shell surrounding the pump wheel, and a cover plate is provided between the vortex shell and the sleeve. The cover plate forms a connecting hole, through which fluid can flow from the space enclosed by the vortex shell and the cover plate to the space enclosed by the sleeve and the cover plate.

[0015] Optionally, the rotor and the pump wheel are connected by a motor shaft, which forms a return channel through which fluid can flow from the space enclosed by the sleeve and the cover plate to the space enclosed by the vortex and the cover plate.

[0016] Optionally, a thermally conductive adhesive layer is provided between the circuit board and the pump housing.

[0017] Optionally, the fluid pump further includes an outer cover connected to the pump housing and covering the circuit board.

[0018] Compared to existing technologies, the fluid pump provided by this utility model has a pump housing outside the motor housing, forming a space between the pump housing and the motor housing where fluid can flow. The circuit board is in thermal contact with the pump housing, and the heat generated by the circuit board and stator can be conducted to the fluid in the aforementioned space through the pump housing for dissipation. Overall, the heat dissipation effect is better, effectively ensuring electrical safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one embodiment of the fluid pump of this utility model.

[0020] Figure 2 for Figure 1 The diagram shows a top view of the fluid pump.

[0021] Figure 3 for Figure 2 A sectional view along line III-III.

[0022] Figure 4 for Figure 1 The exploded view of the fluid pump is shown.

[0023] Figure 5 This is an exploded view of the fluid pump from another angle.

[0024] Figure 6 This is a schematic diagram of another embodiment of the fluid pump of this utility model.

[0025] Figure 7 for Figure 6 The diagram shows a top view of the fluid pump.

[0026] Figure 8 for Figure 7 A cross-sectional view along line VIII-VIII.

[0027] Explanation of icon numbers:

[0028] 100 / 100' fluid pump;

[0029] 20 / 20', Pump casing; 22 / 22', Main body;

[0030] 24 / 24', First cover; 241 / 241', Inlet; 243, Thermally conductive adhesive layer; 245 / 245', Perforation; 247, Second protrusion; 249 / 249', Ring; 26 / 26', Second cover; 261 / 261', Outlet; 263, Vortex shell; 28 / 28', Outer cover;

[0031] 30. Pump impeller; 31. Pump impeller inlet;

[0032] 40. Motor; 41. Motor shaft; 412. Return channel;

[0033] 42 / 42', Motor housing; 422 / 422', Protruding ring; 424, First protrusion;

[0034] 44. Sleeve; 442. First bearing housing; 444. First bearing; 446. First flange;

[0035] 46 / 46', stator; 461 / 461', terminal block;

[0036] 48. Rotor;

[0037] 49 / 49', Circuit board; 492', Connecting terminal;

[0038] 51. First seal; 52. Second seal; 53. Third seal; 54. Fourth seal; 55. Fifth seal; 56. Sixth seal; 57. Seventh seal;

[0039] 60 / 60', First Space; 62, Second Space; 64, Third Space; 66 / 66', Fourth Space; 68', Fifth Space;

[0040] 70. Cover plate; 72. Second bearing housing; 74. Second bearing; 76. Connecting hole; 78. Second flange. Detailed Implementation

[0041] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. One or more embodiments of this utility model are exemplarily shown in the drawings to enable a more accurate and thorough understanding of the disclosed technical solutions. However, it should be understood that this utility model can be implemented in many different forms and is not limited to the embodiments described below.

[0042] This invention provides a fluid pump for driving fluids, such as coolant, to flow in a pipeline. Figure 1-3 The present invention is illustrated in a specific embodiment of the fluid pump 100. The fluid pump 100 includes a pump housing 20, a pump impeller 30 rotatably disposed in the pump housing 20, and a motor 40 that drives the pump impeller 30 to rotate in the pump housing 20.

[0043] Please also refer to Figure 4 and Figure 5 The pump housing 20 includes a cylindrical main body 22 and a first cover 24 and a second cover 26 respectively connected to the axial sides of the main body 22. The first cover 24 and the second cover 26 are preferably sealed to the main body 22, and each of their connection interfaces is provided with a first sealing element 51 (see...). Figure 3 O-rings and other seals are used to prevent fluid leakage from the contact interfaces of the various components of the pump housing 20, ensuring good overall sealing. The first cover 24 has an inlet 241, and the second cover 26 has an outlet 261. The inlet 241 and outlet 261 are used to connect to external pipelines. In this embodiment, the inlet 241 and outlet 261 are arranged in approximately the same direction, both extending radially along the pump housing 20.

[0044] The motor 40 is an internal rotor motor, including a motor housing 42, a sleeve 44 disposed in the center of the motor housing 42, a stator 46 and a rotor 48 with coils wound around them separated by the sleeve 44, and a circuit board 49 electrically connected to the coils of the stator 46.

[0045] like Figure 3As shown, the motor housing 42 is fixedly disposed in the middle of the main body 22 of the pump housing 20 and radially spaced therefrom. A first space 60 is formed between the motor housing 42, the pump housing 20, and the first cover 24. The first space 60 communicates with the inlet 241 of the first cover 24 and the outlet 261 of the second cover 26. The sleeve 44 is fixedly disposed in the middle of the motor housing 42 and radially spaced therefrom. A second space 62 is formed around the sleeve 44 between the two, which is used to install the stator 46. A third space 64 is formed inside the sleeve 44, which is used to install the rotor 48. To ensure electrical safety, the first space 60 and the third space 64 are interconnected, but the second space 62 is not interconnected with either the first space 60 or the third space 64.

[0046] The pump impeller 30 is a flat, disc-shaped structure rotatably disposed in the center of the second cover 26. Preferably, the second cover 26 forms a vortex 263 surrounding the pump impeller 30, constituting a centrifugal pump. A circumferential portion of the vortex 263 and the side facing away from the sleeve 44 form a gap with the second cover 26, and this gap communicates with the first space 60. The vortex 263 opens at the position corresponding to the outlet 261, through which the fluid driven by the pump impeller 30 flows to the outlet 261 and is then discharged outward. In this embodiment, the pump impeller 30 and the rotor 48 are fixedly connected together by a motor shaft 41, and all three rotate synchronously relative to the sleeve 44. In some embodiments, the motor shaft 41 may also be fixedly disposed in the sleeve 44, and the pump impeller 30 and the rotor 48 may be fixedly connected together by other means, such as secondary injection molding, and then rotatably sleeved onto the motor shaft 41.

[0047] When the motor 40 starts, it drives the pump wheel 30 to rotate, generating negative pressure, allowing fluid to flow into the first cover 24 through the inlet 241. Then, as... Figure 3 As indicated by the middle arrow, the fluid flows towards the first space 60 between the main body 22 and the motor housing 42, and then towards the second cover 26, reaching the pump wheel inlet 31 on the side of the pump wheel 30 away from the main body 22. At this point, most of the fluid flows along the inner edge of the volute 263 under the push of the pump wheel 30, and is finally discharged outward from the outlet 261. A small portion of the fluid passes through the cover plate 70 and flows from the second cover 26 to the third space 64 inside the sleeve 44. This portion of the fluid flows through the rotor 48 and returns to the pump wheel 30 through the return channel 412, and is finally discharged outward from the outlet 261. The specific structure will be described in detail in later paragraphs.

[0048] The circuit board 49 is attached to the outer wall surface of the first cover 24 (i.e., the surface facing away from the main body 22). The fluid flowing through the first space 60 can fully contact the inner wall surface of the first cover 24. Thus, the heat generated by the circuit board 49 can be quickly conducted through the first cover 24 to the fluid in the first space 60, and then the fluid flow quickly carries away the heat from the circuit board 49 and dissipates it to the outside, effectively ensuring the electrical safety of the motor 40. Preferably, a thermally conductive adhesive layer 243 is provided between the circuit board 49 and the first cover 24 (see...). Figure 3-4 This effectively fills the gap between the two to improve heat conduction and further enhances heat dissipation for circuit board 49.

[0049] Preferably, the fluid pump 100 further includes an outer cover 28 covering the circuit board 49. In this embodiment, the outer cover 28 is mated with the first cover 24 to form a fourth space 66 between them, which accommodates the circuit board 49. Preferably, a second sealing element 52 is provided at the contact interface between the outer cover 28 and the first cover 24 to effectively prevent external dust, moisture, etc. from entering the fourth space 66 and affecting the safety of the circuit board 49.

[0050] In this embodiment, a protruding ring 422 is formed on the side end of the motor housing 42 near the first cover 24 (see...). Figure 3-4 The stator 46's terminals 461 protrude outward from the protruding ring 422. The first cover 24 forms a ring portion 249 at the position corresponding to the protruding ring 422 (see...). Figure 3 and Figure 5 A through hole 245 is formed in the center of the ring portion 249, and the protruding ring 422 is partially inserted into the through hole 245. The terminal 461 extends through the through hole 245 into the fourth space 66 and is connected to the circuit board 49. Preferably, a third sealing element 53 is provided at the contact interface between the protruding ring 422 of the motor housing 42 and the ring portion 249 of the first cover 24 to prevent fluid from leaking from the first space 60 to the fourth space 66 and affecting the electrical safety of the motor 40.

[0051] Furthermore, the fluid flowing through the first space 60 can fully contact the outer wall of the motor housing 42, allowing the heat generated by the stator 46 coil in the second space 62 to be conducted to the fluid in the first space 60 through the motor housing 42. Moreover, the fluid flowing into the third space 64 can fully contact the inner wall of the sleeve 44, allowing the heat generated by the stator 46 coil to be conducted to the fluid in the third space 64 through the sleeve 44. Thus, the heat from the stator 46 coil can be dissipated through the sleeve 44 and the motor housing 42 to the fluid, effectively preventing heat accumulation in the sealed second space 62 and thus avoiding impact on the electrical safety of the motor 40.

[0052] In this embodiment, as Figure 3As shown, the return channel 412 is disposed in the motor shaft 41, and there can be one or more channels. Preferably, the return channel 412 is a through groove passing through both ends of the motor shaft 41, guiding the fluid to quickly return to the pump impeller 30. Preferably, there is a small distance between the axial inner end faces of the motor shaft 41 and the sleeve 44 (i.e., the end away from the pump impeller 30), which not only allows the fluid to fully contact the axial inner end face of the sleeve 44, enhancing the heat conduction effect between them, but also allows the heat-absorbing fluid to easily enter the return channel 412, quickly carrying away the heat generated by the coil of the stator 46.

[0053] like Figure 3-5 As shown, the sleeve 44 is a cylindrical structure that is closed at the distal end and open at the proximal end. A first bearing seat 442 protrudes axially outward from the center of the distal end of the sleeve 44. A first bearing 444 is installed inside the first bearing seat 442. One end of the motor shaft 41 (as shown) Figure 3 The top end of the sleeve 44 is inserted into the first bearing 444 and spaced from the axial inner end face of the first bearing housing 442. A cover plate 70 seals the open end of the sleeve 44. A second bearing housing 72 is formed by the center of the cover plate 70 protruding into the sleeve 44. The second bearing 74 is installed in the second bearing housing 72. The other end of the motor shaft 41 (as shown) Figure 3 The bottom end (as shown) passes through the second bearing 74 and the cover plate 70 and connects to the pump wheel 30. In this way, both ends of the motor shaft 41 can be effectively supported, the rotation of the pump wheel 30 is more stable, and the noise of the fluid pump 100 is lower.

[0054] like Figure 5 As shown, the cover plate 70 has a connecting hole 76 at a position corresponding to the internal space of the sleeve 44. Preferably, there are multiple connecting holes 76, which are distributed at intervals along the circumference of the cover plate 70. The connecting hole 76 penetrates the cover plate 70 axially, and the fluid at the pump wheel 30 can flow into the third space 64 inside the sleeve 44 through the connecting hole 76 and the gap on the second bearing seat 72. In this embodiment, a fourth sealing element 54 is provided between the outer circumferential surface of the second bearing seat 72 and the inner circumferential surface of the sleeve 44, so that the fluid entering the third space 64 will not leak outward from the contact interface between the two, so that the fluid can flow to various positions of the sleeve 44 and have sufficient heat exchange with it, and finally return to the pump wheel 30 through the return channel 412.

[0055] In this embodiment, the motor housing 42 is also a cylindrical structure that is closed at the distal end and open at the proximal end. A first flange 446 extends radially outward from the open end of the sleeve 44. The outer circumferential surface of the first flange 446 abuts against the inner wall surface of the open end of the motor housing 42, sealing the second space 62. Preferably, a fifth sealing element 55 is provided between the inner wall surface of the open end of the motor housing 42 and the outer circumferential surface of the first flange 446 to ensure the sealing effect of the second space 62.

[0056] A first protrusion 424 is formed axially outward at the center of the closed end of the motor housing 42 to support the first bearing seat 442 of the sleeve 44. Correspondingly, a second protrusion 247 is formed on the inner side of the first cover 24 to support and position the first protrusion 424. The outer side of the first cover 24 is a flat surface, which can maintain good thermal conductivity with the circuit board 49 and has a sufficiently large contact area, allowing the heat from the circuit board 49 to be quickly conducted to the fluid through the first cover 24. Thus, by placing the pump housing 20 outside the motor housing 42 and forming a first space 60 between them where fluid can flow, the circuit board 49 and the pump housing 20 are in thermal conductivity contact, and its heat dissipation is no longer limited by the structure of the sleeve 44.

[0057] In this embodiment, the cover plate 70 further includes a second flange 78 extending radially outward relative to the second bearing seat 72. The second flange 78 closes the side of the volute 263 of the second cover 26 facing the sleeve 44, thus forming a centrifugal pump. The central opening on the side of the volute 263 facing away from the sleeve 44 serves as the fluid inlet of the centrifugal pump, and the opening of the volute 263 corresponding to the outlet 261 serves as the fluid outlet of the centrifugal pump, perpendicular to the fluid inlet. Preferably, a sixth seal 56 is provided at the contact interface between the second flange 78 and the volute 263 to prevent fluid entering the volute 263 from leaking from the contact interface.

[0058] Figure 6-8 The illustration shows another embodiment of the present invention. The main difference between the fluid pump 100' and the previous embodiment lies in the arrangement of the pump housing 20' and the circuit board 49' of the motor. In this embodiment, the pump housing 20' includes a cylindrical main body 22' and a first cover 24' and a second cover 26' respectively connected to the axial sides of the main body 22'. The first cover 24' has an inlet 241' and the second cover 26' has an outlet 261' for connecting to external pipelines. Unlike the previous embodiment, the inlet 241' extends approximately radially along the first cover 24', and the outlet 261' extends tangentially along the outer edge of the second cover 26'.

[0059] The circuit board 49' is attached to the outer wall of the main body 22' of the pump housing 20'. The heat generated during operation is conducted through the main body 22' to the fluid in the first space 60' between the main body 22' and the motor housing 42' for dissipation. Similarly, the fluid pump 100' may also include an outer cover 28', which, unlike the previous embodiment, is connected to the main body 22' to form a fourth space 66' to accommodate the circuit board 49'.

[0060] To increase the contact area between the circuit board 49' and the main body 22', in this embodiment, a portion of the main body 22' is constructed as an arc-shaped plate and a portion as a flat plate. The circuit board 49' and the flat plate portion of the main body 22' are in thermally conductive contact, and a thermally conductive adhesive layer can be provided between them. Preferably, the size of the flat plate portion of the main body 22' is not smaller than the size of the circuit board 49', so that the two can have a sufficiently large contact area.

[0061] The motor housing 42' has a protruding ring 422' protruding towards the first cover 24', and the stator 46's wiring terminal 461' passes through the protruding ring 422'. In this embodiment, the first cover 24' forms a ring portion 249' at the position corresponding to the protruding ring 422', and a through hole 245' is formed in the center of the ring portion 249'. The protruding ring 422' is partially inserted into the through hole 245', and the wiring terminal 461' passes through the protruding ring 422' and extends into the ring portion 249'.

[0062] Accordingly, the flat portion of the circuit board 49' and the main body 22' extends axially to the radially outer side of the first cover 24'. The connection terminal 492' of the circuit board 49' passes through the flat portion of the main body 22' and the ring portion 249' of the first cover 24' and extends into the fifth space 68' enclosed by the ring portion 249', and is electrically connected to the wiring terminal 461' of the stator 46'. Preferably, a seventh sealing element 57' is provided between the ring portion 249' and the convex ring 422', so that the fifth space 68' enclosed by the ring portion 249' is not connected to other spaces of the first cover 24'. In this way, fluid will not leak into the fifth space 68' and affect the safety of the wiring terminal 461' and the connection terminal 492'.

[0063] The fluid pump provided by this utility model forms a space between the motor housing and the pump housing where fluid can flow. The circuit board is in thermal contact with the pump housing, and the heat generated during operation can be dissipated through the pump housing to the fluid in the aforementioned space. In this way, the heat dissipation of the circuit board is no longer limited by the structure of the sleeve, resulting in better overall heat dissipation and effectively ensuring electrical safety.

[0064] It should be noted that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, such as combining different features in various embodiments, and these should all fall within the protection scope of the present invention.

Claims

1. A fluid pump, comprising a pump housing, a pump impeller rotatably disposed within the pump housing, and a motor for driving the pump impeller to rotate within the pump housing, characterized in that, The motor includes a motor housing, a sleeve disposed in the motor housing, a stator with coils wound around it housed between the sleeve and the motor housing, a circuit board electrically connected to the coils of the stator, and a rotor assembled in the sleeve, wherein the pump wheel is connected to the rotor; The pump housing includes a main body that surrounds the motor housing and a cover connected to the end of the main body. The circuit board is in thermal contact with the outer wall of the pump housing. A first space for fluid flow is formed between the pump housing and the motor housing. The heat of the circuit board can be dissipated through the pump housing to the fluid in the first space.

2. The fluid pump as claimed in claim 1, characterized in that, The cover includes a first cover and a second cover respectively disposed at both axial ends of the main body, the pump wheel is disposed in the second cover, and the circuit board is in thermal contact with the outer wall surface of the main body or the first cover.

3. The fluid pump as described in claim 2, characterized in that, The circuit board is located on the axial outer side of the pump housing and is in thermal contact with the outer wall surface of the first cover.

4. The fluid pump as claimed in claim 2, characterized in that, The circuit board is located on the radially outer side of the pump housing and is in thermal contact with the outer wall surface of the main body.

5. The fluid pump as claimed in claim 4, characterized in that, The main body includes an arc-shaped plate and a flat plate connected to each other, and the circuit board is in thermal contact with the outer wall surface of the flat plate.

6. The fluid pump as claimed in claim 2, characterized in that, The first cover has an inlet, and the second cover has an outlet.

7. The fluid pump as claimed in claim 6, characterized in that, Both the inlet and outlet extend radially along the fluid pump; or, the inlet extends radially along the fluid pump and the outlet extends tangentially along the fluid pump.

8. The fluid pump as claimed in claim 2, characterized in that, The second cover has a vortex shell surrounding the pump wheel. A cover plate is provided between the vortex shell and the sleeve. The cover plate has a connecting hole, through which fluid can flow from the space enclosed by the vortex shell and the cover plate to the space enclosed by the sleeve and the cover plate.

9. The fluid pump as claimed in claim 8, characterized in that, The rotor and pump wheel are connected by a motor shaft, which forms a return channel through which fluid can flow from the space enclosed by the sleeve and the cover plate to the space enclosed by the vortex and the cover plate.

10. The fluid pump according to any one of claims 1-9, characterized in that, A thermally conductive adhesive layer is provided between the circuit board and the pump housing.

11. The fluid pump according to any one of claims 1-9, characterized in that, It also includes an outer cover that is connected to the pump housing and covers the circuit board.

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