Automotive electronic cooling water pump and thermal management module thereof

Abstract

The utility model discloses an electronic cooling water pump for a vehicle, which is applied to a thermal management module of a new energy automobile and comprises a pump body, a rotating shaft, an impeller, a motor stator and a motor rotor. After entering from the liquid inlet, cooling liquid is filled in the hollow inner cavity of the pump cavity and sequentially passes through the first cooling face, the second cooling face and the third cooling face to achieve sufficient contact cooling on the permanent magnet, the motor stator, the periphery of the rotating shaft and the inner side of the pump cover, and compared with a traditional electronic water pump which can only cool two faces, the cooling effect of the electronic water pump is more sufficient, and the service life of the electronic water pump is prolonged. The temperature rise is lower, which means that the power density of the electronic water pump can be higher; or under the same power, the weight of the material can be saved. The axial length is smaller, the size is more compact, and the axial force can be exactly counteracted with the axial force generated when the impeller rotates to work, or the axial force is greatly reduced, so that the service life of the thrust sliding bearing on the rotating shaft is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of thermal management systems, specifically to an automotive electronic cooling water pump and a thermal management module including the automotive electronic cooling water pump. Background Technology

[0002] New energy vehicles are powered by lithium-ion batteries, which generate a lot of heat during operation. If not intervened in time, it can affect the operation of the battery pack or even cause thermal runaway and damage. Therefore, the importance of the thermal management module in new energy vehicles is obvious. Its role is to control and optimize heat transfer inside the vehicle.

[0003] Electric water pumps are a crucial component of thermal management modules, primarily used for circulating cooling of power battery packs, drive motors, and electric components in new energy vehicles. They frequently withstand various harsh operating conditions. The basic structure of an electric water pump mainly includes a pump body, pump casing, impeller, and motor. The motor has a stator and a rotor. When energized, a rotating magnetic field is generated within the motor, causing the rotor to move by cutting through the magnetic field and rotate relative to the stator. The rotor drives the impeller to rotate, thereby drawing coolant into the pump and dissipating it outside, achieving a cooling effect.

[0004] Currently, most automotive electronic water pumps use conventional radial flux internal rotor motors, with speeds typically ranging from 4000 to 6500 rpm. Due to the relatively low speed, to ensure heat dissipation efficiency and low temperature rise, the motor must be large and long enough. Furthermore, to ensure sealing, more plastic seals are needed in the axial space inside the motor, resulting in a larger axial dimension and overall volume of the pump. Additionally, because electronic water pumps generate axial forces during operation, the lifespan of the thrust sliding bearings used inside the motor is significantly reduced. While some electronic water pumps on the market use axial flux motors, limitations in the number and structural design of the rotor, stator, and impeller result in insufficient coolant contact, fewer cooling surfaces within the pump, and poorer cooling performance.

[0005] Figures 1-2 This diagram illustrates a conventional radial flux internal rotor electric water pump, comprising a volute, a pump rear cover, a motor stator, a motor rotor, and gaskets. The motor rotor includes permanent magnets, and the motor stator includes stator windings. The permanent magnets and stator windings are axially aligned, resulting in a large axial dimension of the pump. The axial force generated during impeller rotation leads to a shorter lifespan for the thrust sliding bearing. Furthermore, the coolant entering the pump only cools two surfaces (the winding ends and the inner bore), resulting in insufficient stator cooling and a high temperature rise. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, one objective of this utility model is to provide an automotive electronic cooling water pump, and another objective is to provide a thermal management module including such an automotive electronic cooling water pump, which can solve the problems of large axial dimension, low thrust sliding bearing life, and insufficient cooling in existing electronic water pumps.

[0007] This utility model is achieved through the following technical solution:

[0008] An automotive electronic cooling water pump includes: a pump body having a pump cavity inside; an inlet and an outlet on the pump body; a rotating shaft rotatably disposed within the pump cavity; a thrust sliding bearing sleeved on the rotating shaft; an impeller fixed to the end of the rotating shaft and located below the inlet; a motor stator fixed within the pump cavity, the motor stator including stator windings; a motor rotor fixed to the lower end of the impeller; the motor rotor including permanent magnets disposed above the motor stator; the permanent magnets and the stator windings are arranged coaxially; the permanent magnets and... The stator windings have gaps between them, and a first cooling surface is formed on the side opposite to the permanent magnet and the stator windings; one side of the motor stator has a gap with the rotating shaft, and a second cooling surface is formed on the side opposite to the rotating shaft; the bottom of the motor stator has a gap with the pump body, and a third cooling surface is formed on the side opposite to the pump body; the liquid inlet is sequentially connected to the liquid channel formed by the first cooling surface, the second cooling surface and the third cooling surface, so that the coolant entering from the liquid inlet fills the first cooling surface, the second cooling surface and the third cooling surface.

[0009] Further, it includes: gaskets; two gaskets are sleeved on the rotating shaft and respectively disposed at the top and bottom ends of the thrust sliding bearing.

[0010] Furthermore, the outer surface of the motor stator is covered with a plastic sealing layer.

[0011] Furthermore, the outer surface of the permanent magnet is covered with a plastic sealing layer.

[0012] Furthermore, the permanent magnet has a Heilbeck array structure.

[0013] Furthermore, both the motor rotor and the motor stator are single units.

[0014] Furthermore, the pump body includes a volute and a rear pump cover; the rear pump cover is connected to the lower end of the volute to form a pump chamber; the liquid inlet is opened at the upper end of the volute, and the motor stator is fixed inside the rear pump cover.

[0015] Furthermore, the volute, the impeller, the rotating shaft, and the rear pump cover are arranged in a coaxial direction.

[0016] A thermal management module includes the aforementioned automotive electronic coolant pump.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0018] When the motor is connected to the AC power supply, the stator windings in the motor stator are energized and generate a changing magnetic field, which interacts with the permanent magnets on the rotor to form an axial rotating magnetic field. This drives the rotor to rotate relative to the stator in the direction of the magnetic field, thereby driving the rotating shaft and blades to rotate. The axial force generated by the rotation of the blades draws the coolant from the inlet into the pump chamber.

[0019] (1) After the coolant enters from the inlet, it fills the hollow inner cavity of the pump chamber and passes through the first cooling surface, the second cooling surface and the third cooling surface in sequence to achieve sufficient contact cooling of the permanent magnet, the motor stator, the outer periphery of the rotating shaft and the inner side of the pump cover. Compared with the traditional electronic water pump, which can only cool two surfaces, the cooling effect of the pump (especially the motor stator) of this utility model is more sufficient and the temperature rise is lower, which means that the power density of the electronic water pump can be higher; or the material weight can be more economical under the same power.

[0020] (2) Under the same power, the axial length of this utility model is smaller and the volume is more compact, making it suitable for use in the thermal management module of new energy vehicles with high space utilization requirements.

[0021] (3) The axial flux motor with a single rotor and single stator design has a unilateral magnetic pull, which can just offset the axial force generated when the impeller rotates, or greatly reduce the axial force, thereby effectively extending the service life of the thrust sliding bearing on the rotating shaft. Attached Figure Description

[0022] Figure 1 The diagram shows the internal structure of a conventional radial flux internal rotor electronic water pump.

[0023] Figure 2 The diagram shows the coolant flow direction of a traditional radial flux internal rotor electronic water pump.

[0024] Figure 3 The diagram shown is a schematic diagram of the internal structure of this utility model;

[0025] Figure 4 The diagram shows the internal flow direction of the coolant pump according to this invention.

[0026] In the diagram: 10. Pump body; 11. Volute; 12. Rear pump cover; 13. Liquid inlet; 20. Rotating shaft; 30. Thrust sliding bearing; 40. Impeller; 50. Motor stator; 51. Stator winding; 60. Motor rotor; 61. Permanent magnet; 70. First cooling surface; 80. Second cooling surface; 90. Third cooling surface; 100. Gasket. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] This utility model discloses an electronic cooling water pump for vehicles, which can be applied to the thermal management module of new energy vehicles.

[0032] See Figures 3-4This automotive electronic cooling water pump includes: a pump body 10, a rotating shaft 20, an impeller 40, a motor stator 50, and a motor rotor 60. The pump body 10 has an internal pump chamber, with an inlet 13 and an outlet communicating with the pump chamber. The rotating shaft 20 is rotatably mounted within the pump chamber, and a thrust sliding bearing 30 is fitted onto the rotating shaft 20. The impeller 40 is fixed to the end of the rotating shaft 20 and moves synchronously with it, located below the inlet 13. The motor stator 50 is fixedly mounted within the pump chamber, and includes a stator winding 51, which is a coil. The motor rotor 60 is fixed to the lower end of the impeller 40 and includes a permanent magnet 61, which is spaced above the motor stator 50. The permanent magnet 61 and the stator winding 51 are arranged coaxially.

[0033] A gap exists between the permanent magnet 61 and the stator winding 51, and a first cooling surface 70 is formed on the opposite side of the permanent magnet 61 and the stator winding 51. A gap exists between one side of the motor stator 50 and the rotating shaft 20, and a second cooling surface 80 is formed on the opposite side of the motor stator 50 and the rotating shaft 20. A gap exists between the bottom of the motor stator 50 and the pump body 10, and a third cooling surface 90 is formed on the opposite side of the motor stator 50 and the pump body 10. The liquid inlet 13 is sequentially connected to the liquid channel formed by the first cooling surface 70, the second cooling surface 80, and the third cooling surface 90, so that the coolant entering from the liquid inlet 13 fills the first cooling surface 70, the second cooling surface 80, and the third cooling surface 90, and is finally discharged from the liquid outlet.

[0034] When the motor is connected to the AC power supply, the stator winding 51 in the motor stator 50 is energized and generates a changing magnetic field, which interacts with the permanent magnet 61 on the rotor to form an axial rotating magnetic field, thereby driving the rotor to rotate relative to the stator in the direction of the magnetic field, thereby driving the rotating shaft 20 and the blades to rotate. The axial force generated by the rotation of the blades draws the coolant from the inlet 13 into the pump chamber.

[0035] (1) After the coolant enters from the inlet 13, it fills the hollow inner cavity of the pump chamber and passes through the first cooling surface 70, the second cooling surface 80 and the third cooling surface 90 in sequence to achieve sufficient contact cooling of the outer periphery of the permanent magnet 61, the motor stator 50, the rotating shaft 20 and the inner side of the pump cover. Compared with the traditional electronic water pump, which can only cool two surfaces, the cooling effect of the pump (especially the motor stator 50) of this utility model is more sufficient and the temperature rise is lower, which means that the power density of the electronic water pump can be higher; or the material weight can be more economical under the same power.

[0036] (2) Under the same power, the axial length of this utility model is smaller and the volume is more compact, making it suitable for use in the thermal management module of new energy vehicles with high space utilization requirements.

[0037] (3) The axial flux motor with a single rotor and a single stator has a unilateral magnetic pull, which can just offset the axial force generated when the impeller 40 rotates, or greatly reduce the axial force, thereby effectively extending the service life of the thrust sliding bearing 30 on the rotating shaft 20.

[0038] Preferably, the present invention further includes two gaskets 100, which are respectively disposed at the top and bottom ends of the thrust sliding bearing 30. Since the service life of the thrust sliding bearing 30 is significantly extended in this invention, the material specifications of the gaskets 100 can be reduced by one level under the same service life requirements, achieving cost reduction.

[0039] Preferably, the motor stator 50 is a plastic-coated stator, with its outer surface covered by a plastic sealant. Similarly, the outer surface of the permanent magnet 61 is covered by a plastic sealant. This saves back iron and weight, reduces axial dimensions, and greatly reduces the requirements for rotor dynamic balance; the length of the impeller 40 can be reduced, and dynamic balance verification only needs to be performed on one side, greatly reducing the requirements for rotor dynamic balance.

[0040] Preferably, the permanent magnet 61 uses a Heilbeck array for its magnet structure, which also achieves the effect of saving weight.

[0041] Preferably, the motor is a single-stator, single-rotor axial flux motor, which has a unilateral magnetic pull, which helps to offset or greatly reduce the axial force generated when the water pump impeller 40 rotates (opposite to the direction of coolant inlet).

[0042] Preferably, the pump body 10 includes a volute 11 and a rear pump cover 12, the rear pump cover 12 being connected to the lower end of the volute 11 to form an internal pump chamber. The liquid inlet 13 is opened at the upper end of the volute 11, and the motor stator 50 is fixed inside the rear pump cover 12.

[0043] Preferably, the volute 11, impeller 40, rotating shaft 20, and rear pump cover 12 are arranged in the same axial direction. For the same power output, the axial length of the power axial flux motor of this invention is small, which is beneficial for the miniaturization and weight reduction of the thermal management module in new energy vehicles, and its power is only positively correlated with its diameter.

[0044] This utility model also discloses a thermal management module for new energy vehicles, including the aforementioned electronic cooling water pump. Any thermal management module that uses the same or substantially the same electronic cooling water pump should be within the protection scope of this utility model.

[0045] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An electric cooling water pump for a vehicle, characterized by comprising: The utility model relates to a kind of electronic cooling water pump, including: Pump body, the pump cavity is inside with;The pump body is opened with liquid inlet and liquid outlet; Rotary shaft, rotation is arranged in the pump cavity;The rotary shaft is equipped with thrust sliding bearing on it; Impeller, fixed to the end of the rotary shaft, and located below the liquid inlet; Motor stator, fixed in the pump cavity, the motor stator includes stator winding; Motor rotor, fixed to the lower end of the impeller;The motor rotor includes permanent magnet, the permanent magnet is located above the motor stator;The permanent magnet and the stator winding are arranged in coaxial direction; The permanent magnet and the stator winding have gap, and form first cooling surface on the opposite side of permanent magnet and stator winding;The motor stator side and the rotary shaft have gap, and form second cooling surface on the opposite side of motor stator and rotary shaft;The motor stator bottom and the pump body have gap, and form third cooling surface on the opposite side of motor stator and pump body; The liquid inlet is sequentially communicated with the liquid channel formed by the first cooling surface, the second cooling surface and third cooling surface, so that the cooling liquid from the liquid inlet fills on the first cooling surface, the second cooling surface and the third cooling surface.

2. The electric coolant water pump for vehicle according to claim 1, characterized by Including: Gasket;Two gaskets are sleeved on the rotary shaft, and are separately arranged at the top end and bottom end of the thrust sliding bearing.

3. The electric coolant water pump for vehicle according to claim 1, characterized in that, The outer side of the motor stator is wrapped with plastic sealing layer.

4. The electric coolant water pump for vehicle according to claim 1, characterized in that, The outer side of the permanent magnet is wrapped with plastic sealing layer.

5. The electric coolant water pump for automotive use according to claim 1, characterized in that, The magnet structure of the permanent magnet is Halbach array structure.

6. The electric coolant water pump for automotive use according to claim 1, characterized in that, The number of the motor rotor and the motor stator is single.

7. The electric coolant water pump for automotive use according to claim 1, characterized in that, The pump body includes volute and rear pump cover;The rear pump cover is connected to the lower end of the volute, to form pump cavity together;The liquid inlet is opened on the upper end of volute, and the motor stator is fixed in the rear pump cover.

8. The electric coolant water pump for automotive use according to claim 7, characterized in that, The volute, the impeller, the rotary shaft and the rear pump cover are arranged in coaxial direction.

9. A thermal management module characterized by, Including the electronic cooling water pump for vehicle as claimed in any one of claims 1-8.

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