A high-efficiency and high-power electronic water pump

Abstract

This invention discloses a high-efficiency, high-power electronic water pump in the field of electronic water pump technology. It includes a housing with a main inlet and an auxiliary inlet; and a coolant channel located on the housing for cooling the stator and / or control board inside the housing. The two ends of the coolant channel are respectively connected to the main inlet and the auxiliary inlet, allowing the coolant in the auxiliary inlet to flow to the main inlet under the pressure inside the housing. This invention uses liquid cooling to simultaneously dissipate heat from the motor and the control board. An auxiliary inlet is added at the rear of the housing. After cooling the control board and motor, the coolant is circulated out through the high-pressure area of ​​the impeller. This design offers advantages such as simple structure, zero hydraulic loss, and excellent heat dissipation.

Description

Technical Field

[0001] The invention relates to the technical field of electronic water pumps, and in particular to a high-efficiency and high-power electronic water pump. Background Art

[0002] At present, in the field of new energy vehicles, electronic water pumps have gradually replaced traditional mechanical water pumps, delivering coolant to the vehicle thermal management system, taking away most of the heat generated by the vehicle drive motor, battery and control module, and providing thermal fluid for the warm air heating system, ensuring that the vehicle's electric drive system is within the optimal operating temperature range, thereby improving the reliability and safety of new energy vehicles.

[0003] The electronic water pump itself also has the need for heat dissipation. There are currently three main methods for heat dissipation and cooling of electronic water pumps: the first is to fill the motor cavity with heat dissipation glue, but "filling glue" will cause the overall weight of the water pump to increase significantly and the cost to increase; the second is the method of thermal conductive glue + heat dissipation gasket, but the method of thermal conductive glue + heat dissipation gasket is only suitable for low-power electronic water pumps and cannot meet the heat dissipation requirements of high-power electronic water pumps; the third is the wet rotor water circuit cooling method, but the wet rotor water circuit cooling requires increasing the motor air gap, making the motor larger and the cost high. At the same time, the cross-sectional area of ​​the rotor is small, the heat dissipation effect is not good, and the volume of the cooling water jacket is large, requiring more coolant, which will cause the water pump performance to decline significantly. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an efficient and high-power electronic water pump to solve the technical problem of poor heat dissipation effect of the existing electronic water pump.

[0005] The technical solution adopted by the present invention is: a high-efficiency and high-power electronic water pump, comprising:

[0006] A casing, wherein the casing is provided with a main liquid inlet and an auxiliary liquid inlet;

[0007] A coolant flow channel is provided on the casing and is used for cooling the stator and / or control board in the casing. The two ends of the coolant flow channel are respectively connected to the main liquid inlet and the auxiliary liquid inlet, so that the coolant in the auxiliary liquid inlet flows to the main liquid inlet under the pressure inside the casing.

[0008] Furthermore, the casing includes a main volute, a shell, a heat dissipation end cover and an auxiliary volute, the main volute is sealedly connected to the first end of the shell, the heat dissipation end cover is sealedly connected to the inner side of the second end of the shell, and the auxiliary volute is sealedly connected to the outer side of the second end of the shell; a cooling chamber for cooling a control panel arranged on the heat dissipation end cover is formed between the auxiliary volute, the shell and the heat dissipation end cover.

[0009] Furthermore, the main volute is provided with a first cooling liquid channel connected to the main liquid inlet, and the shell is provided with a second cooling liquid channel for cooling the stator inside the shell, and the first cooling liquid channel, the second cooling liquid channel and the cooling cavity are connected in sequence to form the cooling liquid flow channel.

[0010] Furthermore, the second coolant channel is annularly arranged in the side wall of the shell.

[0011] Furthermore, the first coolant channel is arranged in a fan shape in the side wall of the main volute.

[0012] Furthermore, the main liquid inlet and the auxiliary liquid inlet are respectively arranged at two ends of the axial direction of the casing.

[0013] Furthermore, the shell and the heat dissipation end cover are made of aluminum alloy.

[0014] Furthermore, the main volute and the auxiliary volute are made of plastic.

[0015] Furthermore, a stator, a rotor and a rotating shaft are provided in the shell, the stator is connected to the shell by a shrink-fit process, the rotor is arranged on the rotating shaft, and both ends of the rotating shaft are rotatably connected to the shell and the heat dissipation end cover respectively through bearings; and one end of the rotating shaft is rotationally sealed to the shell through a water seal structure.

[0016] Furthermore, a sealing gasket is provided between the main volute and the casing to prevent high-pressure coolant in the casing from flowing into the coolant flow channel.

[0017] Beneficial effects of the present invention:

[0018] 1. The present invention is provided with a main liquid inlet and an auxiliary liquid inlet at both ends of the casing in the axial direction, and a coolant flow channel for cooling the stator and the control board inside the casing is provided on the casing, and the two ends of the coolant flow channel are respectively connected with the main liquid inlet and the auxiliary liquid inlet, so that the coolant is driven by the internal pressure of the casing to flow from the auxiliary liquid inlet to the main liquid inlet, thereby completing the cooling of the stator and the control board inside the casing.

[0019] 2. The present invention cools the control panel and the stator at the same time through the coolant flow channel arranged on the casing, and has high cooling efficiency; and there is no hydraulic loss of hydraulic cooling, which is beneficial to improving the overall efficiency of the water pump.

[0020] 3. The present invention not only has a simple structure, but also has a large heat dissipation area at the control board position, which is beneficial to the heat dissipation of the control board, thereby improving the cooling efficiency; the stator has a large heat dissipation area, which is beneficial to the heat dissipation of the motor and helps to improve the cooling efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present invention;

[0022] Figure 2 Schematic diagram of heat and coolant flow paths of the present invention.

[0023] Description of reference numerals in the figures:

[0024] 10-main volute; 11-main liquid inlet; 12-first cooling liquid channel; 13-liquid inlet cavity;

[0025] 20-housing; 21-second cooling liquid channel;

[0026] 30- heat dissipation end cover;

[0027] 40- auxiliary volute; 41- auxiliary liquid inlet; 42- cooling chamber;

[0028] 50-control panel;

[0029] 60-stator;

[0030] 70-rotor;

[0031] 80-rotating shaft; 81-bearing; 82-water seal structure; 83-impeller;

[0032] 90- sealing ring, 91 sealing gasket. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0037] Examples, such as Figure 1 , Figure 2 As shown, a high-efficiency and high-power electronic water pump comprises:

[0038] The casing is provided with a main liquid inlet 11 and an auxiliary liquid inlet 41, the main liquid inlet 11 and the auxiliary liquid inlet 41 are used for the coolant to enter the casing from different positions;

[0039] The coolant flow channel is arranged on the casing and is used to cool the stator 60 and / or the control board 50 in the casing. The two ends of the coolant flow channel are respectively connected to the main liquid inlet 11 and the auxiliary liquid inlet 41, so that the coolant in the auxiliary liquid inlet 41 flows to the main liquid inlet 11 under the action of the internal pressure of the casing.

[0040] The present invention is provided with a main liquid inlet 11 and an auxiliary liquid inlet 41 at both ends of the casing in the axial direction, and a coolant flow channel for cooling the stator 60 and the control board 50 inside the casing is provided on the casing, and the two ends of the coolant flow channel are respectively connected with the main liquid inlet 11 and the auxiliary liquid inlet 41, so that the coolant is driven by the internal pressure of the casing to flow from the auxiliary liquid inlet 41 to the main liquid inlet 11, thereby completing the cooling of the stator 60 and the control board 50 inside the casing.

[0041] In a specific embodiment, if Figure 1As shown, the casing includes a main volute 10, a shell 20, a heat dissipation end cover 30 and an auxiliary volute 40 which are arranged in sequence; a main liquid inlet 11 is provided on the main volute 10, and the main volute 10 is sealed and connected to the left end of the shell 20 through a sealing ring 90, and a liquid inlet cavity 13 for installing an impeller 83 is formed between the main volute 10 and the shell 20; the heat dissipation end cover 30 is arranged at the right end of the shell 20, and is sealed and connected to the inner side of the right end of the shell 20 through a sealing ring 90, and a liquid inlet cavity 13 for accommodating a stator 60, a rotor 70, a rotating shaft 80 and a control board 5 is formed between the heat dissipation end cover 30 and the shell 20. 0 installation cavity, the control board 50 is arranged on the heat dissipation end cover 30 through heat dissipation silicone grease, so that the heat of the control board 50 is transferred to the heat dissipation end cover 30 more quickly; the auxiliary volute 40 is arranged at the right end of the shell 20, and is sealed and connected to the outer side of the right end of the shell 20 through a sealing ring 90, and a cooling cavity 42 for cooling the control board 50 arranged on the heat dissipation end cover 30 is formed between the auxiliary volute 40, the shell 20 and the heat dissipation end cover 30, and an auxiliary liquid inlet 41 communicated with the cooling cavity 42 is provided on the auxiliary volute 40 for coolant to enter the cooling cavity 42.

[0042] The main volute 10 is provided with a first coolant channel 12 connected with the main liquid inlet 11, and the housing 20 is provided with a second coolant channel 21 for cooling the stator 60 inside the housing 20. The first coolant channel 12, the second coolant channel 21 and the cooling chamber 42 are connected in sequence to form a coolant flow channel. In this way, by providing the first coolant channel 12 on the main volute 10, providing the second coolant channel 21 on the housing 20, and connecting the first coolant channel 12, the second coolant channel 21 and the cooling chamber 42 in sequence, the high pressure in the liquid inlet chamber 13 can be driven to drive the coolant from the auxiliary liquid inlet 41 through the coolant flow channel into the main liquid inlet 11, and complete the cooling and heat dissipation of the stator 60 and the control board 50.

[0043] Preferably, a sealing gasket 91 is further provided between the main volute 10 and the housing 20. In this way, the sealing gasket 91 prevents the coolant in the high-pressure liquid inlet chamber 13 from flowing into the coolant flow channel, thereby preventing the coolant from flowing back and ensuring a better cooling effect.

[0044] Preferably, the second cooling liquid channel 21 is annularly arranged in the side wall of the housing 20. Such an arrangement can increase the contact area between the cooling liquid and the side wall of the housing 20, thereby achieving a better cooling and heat dissipation effect.

[0045] Preferably, the first coolant channel 12 is fan-shaped and arranged in the side wall of the main volute 10. Such arrangement can increase the flow rate of the coolant in the coolant flow channel to achieve a better cooling and heat dissipation effect.

[0046] In a specific embodiment, if Figure 1As shown, the main liquid inlet 11 and the auxiliary liquid inlet 41 are respectively arranged at the two ends of the housing in the axial direction. Such arrangement facilitates the arrangement of a coolant flow channel on the housing, and at the same time, the coolant in the coolant flow channel has a better cooling effect on the stator 60 and the control board 50 in the housing.

[0047] In a specific embodiment, the shell 20 and the heat dissipation end cover 30 are made of aluminum alloy. In this way, the aluminum alloy is a good conductor of heat and has a better heat dissipation effect. The main volute 10 and the auxiliary volute 40 are made of plastic. In this way, the weight and cost can be reduced.

[0048] In a specific embodiment, if Figure 1 As shown, a stator 60, a rotor 70 and a rotating shaft 80 are arranged in the housing 20, and the stator 60 is connected to the housing 20 by a shrink-fit process; such a configuration allows the stator 60 to completely fit the inner surface of the housing 20, and has a good heat conduction effect. The rotor 70 is fixedly arranged on the rotating shaft 80, and the two ends of the rotating shaft 80 are rotatably connected to the housing 20 and the heat dissipation end cover 30 respectively through bearings 81. Such a configuration adopts a double-bearing structure, and the rotor 70 is more stable, which is conducive to reducing NVH (noise, vibration and harshness); at the same time, there is no axial movement, that is, no axial wear, and the parts such as ceramic gaskets are reduced, and there is no radial wear, which has the advantages of simple structure and low cost.

[0049] In a specific embodiment, if Figure 1 As shown, one end of the rotating shaft 80 is connected to the housing 20 by a water seal structure 82 to achieve a rotary seal connection. With such a configuration, the water seal structure 82 is adopted, and water does not need to enter the rotor 70, and there is no hydraulic loss, which not only reduces the setting of the isolation sleeve, but also reduces the air gap volume of the motor, so that the motor is reduced in size, light in weight, and low in cost.

[0050] like Figure 2 As shown in the figure, the dotted arrows represent the direction of heat transfer, and the solid arrows represent the direction of coolant flow.

[0051] The heat dissipation end cover 30 is made of aluminum alloy with good thermal conductivity. The control board 50 is mounted on the heat dissipation end cover 30. The control board 50 is a heat source. The heat is transferred to the heat dissipation end cover 30 through the heat dissipation silicone grease, and then the heat is transferred out through the coolant in the cooling cavity 42. The housing 20 is made of aluminum alloy with good thermal conductivity. The housing 20 and the stator 60 are heat-shrink-fitted, so that the surface of the stator 60 and the housing 20 can be completely fitted, and the heat conduction effect is good. The stator 60 is a heat source, and the heat is transferred out through the coolant in the second coolant channel 21 on the housing 20. The auxiliary volute 40 cooperates with the housing 20, and the auxiliary volute 40 is provided with an auxiliary liquid inlet 41, and the coolant can flow into the interior of the housing from the auxiliary liquid inlet 41.

[0052] Cooling circuit design: The coolant enters the casing from the auxiliary liquid inlet 41, takes away the heat of the control board 50 through the cooling chamber 42, takes away the heat of the motor through the second coolant channel 21 on the casing 20, and then flows to the main liquid inlet 11 of the main volute 10 through the first coolant channel 12 on the main volute 10, and generates high pressure through the impeller 83 to circulate the coolant out.

[0053] Water circuit design: The coolant enters the casing from the main liquid inlet 11 of the main volute 10, generates high pressure through the impeller 83, and circulates the coolant out.

[0054] Compared with the prior art, this application has at least the following beneficial technical effects:

[0055] 1. The housing 20, the water seal structure 82, the heat dissipation end cover 30, and the sealing ring 90 form a closed installation cavity, and the coolant cannot flow into the installation cavity. The housing 20 and the heat dissipation end cover 30 are made of aluminum alloy, which can effectively shield the radiation of the motor and the control board 50, which is beneficial to reducing EMC (electromagnetic compatibility).

[0056] 2. The rotating shaft 80 adopts a double-bearing structure, and the bearing 81 adopts a high-speed silent bearing. One bearing 81 is assembled on the housing 20 with an interference fit, and the other bearing 81 is assembled on the heat dissipation end cover 30 with an interference fit. The heat dissipation end cover 30 and the housing 20 have an interference fit, which ensures concentricity, helps to reduce NVH, reduce the axial movement of the rotor 70, and avoid axial wear and radial wear.

[0057] 3. In the present application, the control board 50 (also called a circuit board or a driver) and the stator 60 are cooled together, and the cooling efficiency is increased.

[0058] 4. The present application has no hydraulic loss of hydraulic cooling, which is beneficial to improving the overall efficiency of the water pump; the structure is simple, and the heat dissipation area at the control board 50 is large, which is beneficial to the heat dissipation and efficiency improvement of the control board 50. The motor heat dissipation area is large, which is beneficial to the heat dissipation of the motor and the improvement of the efficiency of the motor.

[0059] 5. The material of the housing 20 and the heat dissipation end cover 30 is aluminum alloy, which not only helps to improve the heat dissipation efficiency, but also allows the main volute 10 and the auxiliary volute 40 to be made of plastic, which is beneficial to reduce weight and cost.

[0060] The present application adopts a water seal structure 82, which has no hydraulic loss, and water does not need to enter the rotor 70, thereby reducing the setting of the isolation sleeve and the air gap volume of the motor, thereby reducing the volume of the motor, making the motor light and low in cost.

[0061] 7. The present application adopts liquid cooling (with antifreeze as the medium) to take into account the heat dissipation of the motor and the control board. An auxiliary liquid inlet 41 is added from the rear end of the casing, and the coolant is circulated out through the high-pressure area of ​​the impeller 83 after cooling the control board 50 and the motor. It has the advantages of single structure, no hydraulic loss, and good heat dissipation effect.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A high-efficiency and high-power electronic water pump, characterized in that: include: A casing, wherein a main liquid inlet (11) and an auxiliary liquid inlet (41) are provided on the casing; the casing comprises a main volute (10), a shell (20), a heat dissipation end cover (30) and an auxiliary volute (40); the main volute (10) is sealedly connected to a first end of the shell (20), and a liquid inlet cavity (13) is formed between the main volute (10) and the shell (20), and an impeller (83) is installed in the liquid inlet cavity (13); the heat dissipation end cover (30) is sealedly connected to the inner side of the second end of the shell (20), the auxiliary volute (40) is sealedly connected to the outer side of the second end of the shell (20), and a cooling cavity (42) for cooling a control panel (50) arranged on the heat dissipation end cover (30) is formed between the auxiliary volute (40), the shell (20) and the heat dissipation end cover (30); A cooling liquid flow channel, the cooling liquid flow channel comprising a first cooling liquid channel (12), a second cooling liquid channel (21) and a cooling cavity (42) which are connected in sequence, the first cooling liquid channel (12) being arranged on the main volute (10), and the first cooling liquid channel (12) being connected to the main liquid inlet (11), the second cooling liquid channel (21) being arranged on the shell (20) and used for cooling the stator (60) inside the shell (20); the main liquid inlet (11) being arranged on the main volute (10) and connected to the liquid inlet cavity (13), the auxiliary liquid inlet (41) being arranged on the auxiliary volute (40) and connected to the cooling cavity (42), so that the cooling liquid in the auxiliary liquid inlet (41) flows to the main liquid inlet (11) under the action of the internal pressure of the liquid inlet cavity (13).

2. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: The second coolant channel (21) is annularly arranged in the side wall of the housing (20).

3. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: The first coolant channel (12) is arranged in a fan shape inside the side wall of the main volute (10).

4. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: The main liquid inlet (11) and the auxiliary liquid inlet (41) are respectively arranged at two ends of the axial direction of the casing.

5. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: The shell (20) and the heat dissipation end cover (30) are made of aluminum alloy.

6. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: The main volute (10) and the auxiliary volute (40) are made of plastic.

7. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: A stator (60), a rotor (70) and a rotating shaft (80) are arranged in the housing (20); the stator (60) is connected to the housing (20) by a shrink-fit process; the rotor (70) is arranged on the rotating shaft (80); two ends of the rotating shaft (80) are rotatably connected to the housing (20) and the heat dissipation end cover (30) respectively by bearings (81); and one end of the rotating shaft (80) is rotatably sealed to the housing (20) by a water seal structure (82).

8. The high-efficiency and high-power electronic water pump according to claim 1, characterized in that: A sealing gasket (91) is provided between the main volute (10) and the casing (20) to prevent high-pressure coolant in the casing from flowing into the coolant flow channel.

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