Electric water pump

Abstract

The present invention discloses an electric water pump, comprising a driving motor, the driving motor comprising a cylindrical motor housing, a stator, a rotor, a motor shaft and an end cover; the motor housing is fixedly mounted to one side of the end cover; a cylindrical outer shell is also fixedly mounted on one side of the end cover, the motor housing is located in the outer shell, and the central axis of the motor housing coincides with the central axis of the outer shell; a pump body with a chamber is provided on the other side of the end cover, and a rotating blade is provided in the pump body; a cooling fan is fixedly mounted on one end of the motor shaft away from the end cover; a first air inlet is provided at one end of the outer shell close to the end cover; a first air outlet is provided at the outer shell away from the rear end; the first air inlet, the gap between the motor housing and the outer shell, and the first air outlet form a first heat dissipation path. The benefit of the present invention is that the electric water pump provided can provide a heat dissipation effect of the electric water pump through the first air inlet, the gap between the motor housing and the outer shell, and the first heat dissipation path formed by the first air outlet.

Description

Technical Field

[0001] The invention relates to an electric water pump, and in particular to a heat dissipation structure of the electric water pump. Background Art

[0002] As people's living standards improve, there will be more and more outdoor leisure facilities such as swimming pools. As a common supporting facility for swimming pools, the demand for electric water pumps is also increasing. In existing electric water pumps, the motor housing of the driving motor also serves as the outer shell of the electric water pump, which has the disadvantages of poor heat dissipation effect of the driving motor and short service life. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides an electric water pump with high heat dissipation efficiency.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An electric water pump, comprising a drive motor, the drive motor is used to drive the electric water pump, the drive motor comprises a cylindrical motor housing, a stator arranged on the inner wall of the motor housing, a rotor rotatably arranged in the stator, a motor shaft connected to the rotor and rotating with the rotor, and an end cover; the motor housing is fixedly mounted to one side of the end cover, the motor housing and the end cover are provided with bearings for supporting the motor shaft, and the motor shaft rotates relative to the bearing; a cylindrical outer shell is also fixedly mounted on one side of the end cover, the motor housing is located in the outer shell, and the motor housing is in the motor housing. The axis coincides with the central axis of the outer shell; a pump body with a chamber is provided on the other side of the end cover, and rotating blades are provided in the pump body, and the rotating blades are connected to the motor shaft and can be driven to rotate by the motor shaft; a water inlet and a water outlet connected to the chamber are formed on the pump body; a cooling fan is fixedly installed at one end of the motor shaft away from the end cover; a first air inlet is provided at one end of the outer shell close to the end cover; a first air outlet is provided on the outer shell away from the rear end; the first air inlet, the gap between the motor shell and the outer shell, and the first air outlet form a first heat dissipation passage.

[0006] Furthermore, the ratio of the outer diameter of the motor housing to the inner diameter of the outer housing is greater than or equal to 0.75 and less than or equal to 0.95.

[0007] Furthermore, the gap between the motor housing and the outer shell is greater than or equal to 5 mm.

[0008] Furthermore, a control box is installed on the outer surface of the shell; a controller is provided in the control box and is electrically connected to the drive motor to control the operation of the drive motor; a plurality of heat dissipation fins are formed on the outer surface of the control box, and the plurality of heat dissipation fins are located between the control box and the drive motor, and the heat dissipation fins extend along the axial direction of the motor shaft; a plug-in window for inserting the heat dissipation fin is provided at a position of the shell opposite to the heat dissipation fin; and the first heat dissipation path passes through the heat dissipation fin.

[0009] Furthermore, a first surface passing through the rotation center of the motor shaft is tangent to one of the heat sinks, and a plurality of the heat sinks are located on the same side of the first surface; a second surface passing through the rotation center of the motor shaft is tangent to another heat sink, and a plurality of the heat sinks are located on the same side of the second surface; and the range of the angle formed by the intersection of the first surface and the second surface is greater than or equal to 30° and less than or equal to 80°.

[0010] Furthermore, the first surface and the second surface divide the space into four areas; the first air inlet and the heat dissipation fins are located in the same area.

[0011] Furthermore, the distances from one end of the heat dissipation fin away from the controller to the rotation center of the motor shaft are equal.

[0012] Furthermore, a second air inlet is formed on the surface of the controller facing away from the outer shell; a second air outlet is formed between the plurality of heat dissipation fins; the second air inlet, the inner cavity of the controller, the second air outlet, the plug-in window, the gap between the motor casing and the outer shell, and the first air outlet form a second heat dissipation path, and the second heat dissipation path passes through the heat dissipation fins.

[0013] Furthermore, the second air inlet is located at one end of the controller close to the end cover.

[0014] Furthermore, an air guide cover for guiding airflow is also provided in the shell, and the air guide cover is located between the fan and the driving motor.

[0015] The benefit of the present invention is that the electric water pump provided can provide a heat dissipation effect for the electric water pump through the first heat dissipation passage formed by the first air inlet, the gap between the motor housing and the housing, and the first air outlet.

[0016] The present invention is also beneficial in that the electric water pump provided improves the heat dissipation efficiency of the controller by placing the heat dissipation fins on the controller into the first heat dissipation path. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an electric water pump of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional view of the electric water pump;

[0019] Figure 3 yes Figure 1 A cross-sectional view of the electric water pump from another perspective.

[0020] Electric water pump 10, driving motor 11, motor housing 111, stator 112, rotor 113, motor shaft 114, end cover 115, housing 12, pump body 13, rotating impeller 131, water inlet 132, water outlet 133, cooling fan 14, first air inlet 121, first air outlet 122, first heat dissipation passage, control box 15, cooling fins 151, plug-in window 123, first surface 16, second surface 17, air guide cover 124, pad 18, support frame 19. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 3 As shown, an electric water pump 10 includes a driving motor 11, which is used to drive the electric water pump 10. The driving motor 11 includes a motor housing 111, a stator 112, a rotor 113, a motor shaft 114 and an end cover 115.

[0023] Specifically, the motor housing 111 is cylindrical, the stator 112 is disposed on the inner wall of the cylindrical motor housing 111 , the stator 112 is rotatably disposed inside the stator 112 , and the motor shaft 114 is inserted into the rotor 113 and rotates together with the rotor 113 .

[0024] The motor housing 111 is fixedly mounted on one side of the end cover 115. The motor housing 111 and the end cover 115 are respectively provided with bearings for supporting the motor shaft 114. The motor shaft 114 is rotatably mounted on the bearings. The outer shell 12 wraps the motor housing 111 inside. The outer shell 12 is fixed to the end cover 115. The central axis of the motor housing 111 coincides with the central axis of the outer shell 12.

[0025] A pump body 13 having a chamber is installed on the other side of the end cover 115. A rotary impeller 131 is arranged in the pump body 13. The rotary impeller 131 is connected to the motor shaft 114 and can rotate with the motor shaft 114. A water inlet 132 and a water outlet 133 communicating with the chamber are formed on the pump body 13 for sucking and discharging water respectively. A cooling fan 14 is fixedly installed at one end of the motor shaft 114 away from the end cover 115, a first air inlet 121 is provided at one end of the outer shell 12 close to the end cover 115, and a first air outlet 122 is provided at the outer shell 12 away from the rear end. The first air inlet 121, the gap between the motor shell 111 and the outer shell 12, and the first air outlet 122 form a first heat dissipation passage. When the cooling fan 14 is driven to rotate, the airflow enters the outer shell 12 through the first air inlet 121, passes through the gap between the motor shell 111 and the outer shell 12, and then passes through the cooling fan 14, and finally is discharged from the outer shell 12 through the first air outlet 122. The airflow flows through the outer surface of the motor shell 111 to dissipate heat and cool the drive motor 11.

[0026] Specifically, the electric water pump 10 is further provided with a support frame 19 , and the support frame 19 is used to support the electric water pump 10 .

[0027] As a preferred embodiment, the ratio of the outer diameter of the motor housing 111 to the inner diameter of the housing 12 is greater than or equal to 0.75 and less than or equal to 0.95.

[0028] Specifically, the parameter setting of the outer diameter of the motor housing 111 and the inner diameter of the housing 12 is related to the airflow ventilation volume of the first heat dissipation path and the overall size of the electric water pump 10. The ventilation volume of the first heat dissipation path is guaranteed under the premise of ensuring the compactness of the overall structure and the small size of the overall machine, so that the heat dissipation of the electric water pump 10 is maintained at a high level. Generally, the ratio of the outer diameter of the motor housing 111 to the inner diameter of the housing 12 is greater than or equal to 0.75 and less than or equal to 0.95. The outer diameter of the motor housing 111 used in this embodiment is 72 mm, the inner diameter of the housing 12 is 80 mm, and the ratio of the outer diameter of the motor housing 111 to the inner diameter of the housing 12 is 0.9.

[0029] As a preferred embodiment, the gap between the motor housing 111 and the housing 12 is greater than or equal to 5 mm. To ensure the ventilation volume of the first heat dissipation path, the parameters of the motor housing 111 and the housing 12 are set to control the gap between the motor housing 111 and the housing 12 to be greater than or equal to 5 mm. The outer diameter of the motor housing 111 and the gap between the housing 12 used in this embodiment is 8 mm.

[0030] As a preferred embodiment, a control box 15 is installed on the outer surface of the housing 12. A controller (not shown) is provided in the control box 15, which is electrically connected to the drive motor 11 to control the operation of the drive motor 11. A plurality of heat dissipation fins 151 are formed on the outer surface of the control box 15. The plurality of heat dissipation fins 151 are located between the control box 15 and the drive motor 11, and the heat dissipation fins 151 extend along the axial direction of the motor shaft 114. A plug-in window 123 for inserting the heat dissipation fins 151 is provided at a position of the housing 12 opposite to the heat dissipation fins 151. The first heat dissipation path passes through the heat dissipation fins 151.

[0031] Specifically, the control box 15 is made of metal, generally an aluminum shell, and a plurality of heat dissipation fins 151 are integrally formed on the control box 15. The heat dissipation fins 151 are arranged to extend along the axial direction of the motor shaft 114. A plug-in window 123 is provided on the housing 12. When the control box 15 is installed on the housing 12, the heat dissipation fins 151 are inserted into the housing 12 and are located in the first heat dissipation path. When the heat dissipation fan 14 is driven to rotate, the airflow enters the housing 12 through the first air inlet 121 and passes through the gap between the motor housing 111 and the housing 12, and then passes through the heat dissipation fan 14, and finally is discharged from the housing 12 through the first air outlet 122. The airflow flows through the heat dissipation fins 151 to dissipate heat and cool the control box 15. The control box 15 is fixedly installed on the housing 12, and a pad 18 can be provided between the control box 15 and the housing 12.

[0032] As a preferred embodiment, a first surface 16 passing through the rotation center of the motor shaft 114 is tangent to a heat dissipation fin 151, and multiple heat dissipation fins 151 are located on the same side of the first surface 16. A second surface 17 passing through the rotation center of the motor shaft 114 is tangent to another heat dissipation fin 151, and multiple heat dissipation fins 151 are located on the same side of the second surface 17. The range of the angle formed by the intersection of the first surface 16 and the second surface 17 is greater than or equal to 30° and less than or equal to 80°.

[0033] Specifically, the size of the heat sink 151 is subject to many conditions. When the size of the heat sink 151 is too small, the heat dissipation effect of the heat sink 151 on the control box 15 is low. When the size of the heat sink 151 is too large, it affects the structural design and parts arrangement of the whole machine. Therefore, in order to ensure the heat dissipation efficiency of the control box 15 and the structural design of the whole machine, the size of the heat sink 151 is limited by two surfaces passing through the rotation center of the motor shaft 114, wherein the first surface 16 is tangent to an outer heat sink 151, and the second surface 17 is tangent to another outer heat sink 151. All heat sinks 151 are in the area defined by the first surface 16 and the second surface 17. The value range of the angle between the first surface 16 and the second surface 17 is greater than or equal to 30° and less than or equal to 80°. In this embodiment, the angle between the first surface 16 and the second surface 17 is 57°.

[0034] As a preferred implementation, the ratio of the angle between the first surface 16 and the second surface 17 to the radius of the cooling fan 14 is greater than or equal to 0.8° / mm and less than or equal to 1.5° / mm.

[0035] Specifically, the cooling fan 14 needs to dissipate heat for the cooling fins 151. The size of the cooling fan 14 depends on the size of the cooling fins 151. When the cooling fins 151 are large in size, a cooling fan 14 of a larger size is required to dissipate heat for the cooling fins 151. In this embodiment, the radius of the cooling fan 14 is 60 mm, and the ratio of the angle between the first surface 16 and the second surface 17 to the radius of the cooling fan 14 is 0.95° / mm.

[0036] As an optional implementation, the first surface 16 and the second surface 17 divide the space into four areas. The first air inlet 121 and the heat dissipation fins 151 are located in the same area.

[0037] Specifically, the air flow rates at different positions of the first heat dissipation passage are different. The first surface 16 and the second surface 17 divide the space into four areas. The first air inlet 121 and the heat dissipation fins 151 are arranged in the same area. The airflow entering the shell through the first air inlet 121 flows preferentially through the heat dissipation fins 151, thereby improving the heat dissipation effect of the heat dissipation fins 151 on the control box 15.

[0038] As a preferred embodiment, the distance between the end of the heat dissipation fin 151 away from the control box 15 and the rotation center of the motor shaft 114 is equal.

[0039] Specifically, the ends of all the heat dissipation fins 151 away from the control box 15 are located on a circle concentric with the motor housing 111 , so that the heat dissipation fins 151 and the motor housing 111 fit more closely.

[0040] As a preferred embodiment, a second air inlet is formed on the surface of the control box 15 facing away from the housing 12. A second air outlet is formed between the plurality of heat dissipation fins 151. The second air inlet, the inner cavity of the control box 15, the second air outlet, the plug-in window 123, the gap between the motor housing 111 and the housing 12, and the first air outlet 122 form a second heat dissipation path, and the second heat dissipation path passes through the heat dissipation fins 151.

[0041] Specifically, a second air inlet is formed on the surface of the control box 15 facing away from the outer shell 12, and a second air outlet is formed between the multiple heat dissipation fins 151. When the heat dissipation fan 14 is driven to rotate, the air flow enters the inner cavity of the control box 15 through the second air inlet and is discharged into the outer shell 12 from the second air outlet, then passes through the gap between the motor housing 111 and the outer shell 12, passes through the heat dissipation fan 14, and finally is discharged from the outer shell 12 through the first air outlet 122.

[0042] As a preferred embodiment, the second air inlet 152 is located at one end of the control box 15 close to the end cover 115. Specifically, the second air inlet 152 is arranged away from the first air outlet 122 to prevent the hot air flow discharged from the first air outlet 122 from directly entering the second air inlet 152, thereby causing the hot air flow to circulate between the second air inlet 152 and the first air outlet 122.

[0043] As a preferred embodiment, an air guide 124 for guiding airflow is further provided in the housing 12, and the air guide 124 is located between the fan and the drive motor 11. Specifically, the air guide 124 guides the airflow to the cooling fan 14, avoids the airflow from running around, and improves the cooling efficiency.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An electric water pump, comprising a drive motor, wherein the drive motor is used to drive the electric water pump, characterized in that: The driving motor comprises a cylindrical motor shell, a stator arranged on the inner wall of the motor shell, a rotor rotatably arranged in the stator, a motor shaft connected to the rotor and rotating with the rotor, and an end cover; the motor shell is fixedly mounted on one side of the end cover, the motor shell and the end cover are provided with bearings for supporting the motor shaft, and the motor shaft rotates relative to the bearing; a cylindrical shell is also fixedly mounted on one side of the end cover, the motor shell is located in the shell, and the central axis of the motor shell coincides with the central axis of the shell; a pump body with a chamber is provided on the other side of the end cover, and rotating blades are provided in the pump body, and the rotating blades are connected to the motor shaft and can be driven to rotate by the motor shaft; a water inlet and a water outlet connected to the chamber are formed on the pump body; a cooling fan is fixedly mounted on one end of the motor shaft away from the end cover; a first air inlet is provided at one end of the shell close to the end cover; a first air outlet is provided at one end of the shell away from the end cover; the first air inlet, the gap between the motor shell and the shell, and the first air outlet form a first heat dissipation passage; A control box is installed on the outer surface of the housing; a controller is arranged in the control box, which is electrically connected to the drive motor to control the operation of the drive motor; a plurality of heat dissipation fins are formed on the outer surface of the control box, the plurality of heat dissipation fins are located between the control box and the drive motor, and the heat dissipation fins extend along the axial direction of the motor shaft; a plug-in window for inserting the heat dissipation fins is provided at a position of the housing opposite to the heat dissipation fins; the first heat dissipation path passes through the heat dissipation fins; A first surface passing through the rotation center of the motor shaft is tangent to one of the heat sinks, and a plurality of the heat sinks are located on the same side of the first surface; a second surface passing through the rotation center of the motor shaft is tangent to another heat sink, and a plurality of the heat sinks are located on the same side of the second surface; an angle formed by the intersection of the first surface and the second surface is greater than or equal to 30° and less than or equal to 80°; The first surface and the second surface divide the space into four areas; the first air inlet and the heat dissipation fins are located in the same area; The ratio of the angle between the first surface and the second surface to the radius of the heat dissipation fan is greater than or equal to 0.8° / mm and less than or equal to 1.5° / mm.

2. The electric water pump according to claim 1, characterized in that: The ratio of the outer diameter of the motor housing to the inner diameter of the outer housing is greater than or equal to 0.75 and less than or equal to 0.

95.

3. The electric water pump according to claim 2, characterized in that: The range of the gap between the motor housing and the outer housing is greater than or equal to 5 mm.

4. The electric water pump according to claim 1, characterized in that: The distance between the end of the heat dissipation fin away from the controller and the rotation center of the motor shaft is equal.

5. The electric water pump according to claim 1, characterized in that: A second air inlet is formed on the surface of the controller facing away from the outer shell; a second air outlet is formed between the plurality of heat dissipation fins; the second air inlet, the inner cavity of the controller, the second air outlet, the plug-in window, the gap between the motor housing and the outer shell, and the first air outlet form a second heat dissipation path, and the second heat dissipation path passes through the heat dissipation fins.

6. The electric water pump according to claim 5, characterized in that: The second air inlet is located at one end of the controller close to the end cover.

7. The electric water pump according to claim 1, characterized in that: An air guide cover for guiding airflow is also arranged in the shell, and the air guide cover is located between the fan and the driving motor.

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