Electronic water pump

Abstract

The invention relates to the technical field of cooling water pumps for engines, and particularly discloses an electronic water pump which comprises a water pump shell, an impeller, a middle shaft, a stator assembly and a rotor assembly, one end of the water pump shell is in butt joint with a volute cavity in an engine cylinder, a mounting cavity is integrally formed in the water pump shell, and a PCB is mounted in the mounting cavity; a flow channel is formed in the center of the center shaft, a plurality of liquid drainage holes are formed in the part, located in the cavity, of the center shaft in a surrounding mode in the radial direction and located in the end, away from the impeller, of the cavity, a plurality of through holes are further formed in the water pump shell, and the two ends of each through hole communicate with the cavity and the volute cavity correspondingly. The middle shaft further communicates with a first conveying pipe; a plurality of cooling channels are formed in the part, between the mounting cavity and the cavity, of the water pump shell at intervals, one end of each cooling channel communicates with the volute cavity, and the other end of each cooling channel communicates with the first conveying pipe through a second conveying pipe; the electronic water pump can respectively cool the motor and the PCB according to the cooling requirements of the motor and the PCB.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling water pumps for engines, and in particular to an electronic water pump. Background Art

[0002] The engine cooling water pump is the heart of the automobile engine cooling system. Its function is to increase the working pressure of the coolant in the circulation system, maintain the coolant circulation between the engine-related components, and prevent the engine from running too high. The power source of the traditional mechanical water pump needs to come from the car's engine, which will consume the engine's power and increase the engine's torque loss. Therefore, most of them now use electronic water pumps, which are powered by motors alone. The motor can accurately control the pumping needs, and then control the cooling on demand.

[0003] Electronic water pumps are micro water pumps commonly used in many new energy vehicles, RVs and other special vehicles as water circulation, cooling or on-board water supply systems. In order to improve the integration of the whole machine and reduce the space occupied, the motor, pump body and centralized electronic control PCB board are integrated into one piece. The motor body and the PCB board need to dissipate heat during operation, otherwise it will affect the normal operation of the motor and PCB board. Since the heat generated by the PCB board and the motor is different, the cooling requirements of the two are different, and thus an electronic water pump is needed that can cool the motor and PCB board separately according to their cooling needs. Summary of the invention

[0004] The object of the present invention is to provide an electronic water pump which can cool down a motor and a PCB board respectively according to the cooling needs of the motor and the PCB board.

[0005] The present invention is implemented through the following technical solutions: an electronic water pump, comprising a water pump housing, an impeller, a central shaft, a stator assembly and a rotor assembly, one end of the water pump housing is butted with a volute cavity on an engine cylinder block, the central shaft is rotatably arranged on the water pump housing, a cavity is provided in the water pump housing, the stator assembly is arranged in the cavity, the rotor assembly is sleeved on the central shaft, and the rotor assembly is rotatably arranged in the stator assembly; the impeller is sleeved on the central shaft, and the impeller is located in the volute cavity;

[0006] The water pump housing is integrally provided with an installation cavity, and a PCB board is installed in the installation cavity;

[0007] A flow channel is provided at the center of the central axis, and a portion of the central axis located in the cavity is radially provided with a plurality of drainage holes, and the plurality of drainage holes are located at an end of the cavity away from the impeller. The water pump housing is also provided with a plurality of through holes, and both ends of the plurality of through holes are respectively connected to the cavity and the volute cavity.

[0008] Furthermore, a communication cavity is provided on the water pump housing, and one end of the central axis away from the impeller is connected to the communication cavity, and the communication cavity is connected to the first delivery pipe;

[0009] A plurality of cooling channels are arranged at intervals between the installation cavity and the cavity on the water pump housing, one end of the plurality of cooling channels is connected to the volute cavity, and the other ends of the plurality of cooling channels are connected to the first delivery pipe through a second delivery pipe.

[0010] Furthermore, it also includes a valve plate, the valve plate is slidably arranged on the water pump housing, a main hole is opened on the valve plate, the central axis passes through the main hole, and the diameter of the main hole is larger than the diameter of the central axis;

[0011] The valve plate is also provided with a plurality of first auxiliary holes, and the plurality of first auxiliary holes are respectively connected with the plurality of through holes;

[0012] The valve plate is also provided with a plurality of second auxiliary holes. When the valve plate is translated to block a plurality of the first auxiliary holes, the plurality of the second auxiliary holes are respectively connected with a plurality of the cooling channels.

[0013] Furthermore, it also includes a return spring and a driving member, wherein one end of the valve plate is provided with a plurality of return springs, and the two ends of the return spring act on the water pump housing and the valve plate respectively, and the return spring is located on a side of the plurality of first auxiliary holes away from the second auxiliary holes;

[0014] The driving member is arranged on a side of the valve plate away from the return spring, and the driving member is used to drive the valve plate to move toward the return spring.

[0015] Furthermore, the driving member includes a driving pin, a sliding hole is opened on the water pump housing, the sliding hole is perpendicular to the valve plate, the driving pin is slidably arranged in the sliding hole, and an inclined surface is arranged on the end of the driving pin close to the valve plate, and the valve plate slides and abuts against the inclined surface.

[0016] Furthermore, the driving member further comprises a first magnet and a second magnet, the sliding hole comprises a guide section and a mounting section, a sliding seat is provided at one end of the driving pin away from the inclined surface, the driving pin is slidably placed in the guide section, and the sliding seat is slidably placed in the mounting section;

[0017] The first magnet and the second magnet are also arranged in the installation section, the first magnet and the second magnet have the same magnetic pole at one end close to each other, and the first magnet is connected to the slide seat at one end away from the second magnet;

[0018] A sealing cover is provided at one end of the installation section away from the guiding section, and the second magnet is connected to the sealing cover.

[0019] Furthermore, it also includes a coil spring, which is sleeved on the portion of the driving pin located at the installation section, and the two ends of the coil spring are respectively in contact with the sliding seat and the water pump housing.

[0020] Furthermore, a cylindrical shielding layer is provided on the inner wall of the mounting section, and the first magnet and the second magnet are both located in the inner cavity of the shielding layer.

[0021] Further, the cooling channel includes a cooling section, a connecting section and an output hole, the length of the cooling section is greater than the length of the connecting section, and the cooling section is located between the sliding hole and the mounting cavity;

[0022] The output hole is located between the sliding hole and the through hole, two ends of the connecting section are respectively connected to the output hole and the cooling section, and one end of the cooling section away from the connecting section is connected to the second conveying pipe.

[0023] Furthermore, a first temperature sensor and a second temperature sensor are respectively disposed in the cavity and the mounting cavity;

[0024] The first magnet or the second magnet is an electromagnet.

[0025] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0026] 1. According to cooling needs, when the cooling channel is not needed to cool the installation cavity, the driving member first drives the valve plate to move toward the side of the through hole, compresses the reset spring and aligns the first auxiliary holes with the through hole, so that the cooling water continues to enter the cavity and flows back to the volute cavity through the central axis; and when the cooling channel is needed to cool the installation cavity, the driving member is controlled to cancel the action of the valve plate, and under the action of the reset spring, the valve plate moves toward the side of the cooling channel until the second auxiliary hole is connected to the cooling channel and the first auxiliary hole is misaligned with the through hole.

[0027] 2. As the running time of the whole machine increases, the heat generated by the PCB board gradually increases, and the temperature of the water pump housing close to the installation cavity also rises sufficiently, and then the temperature of the first magnet and the second magnet also gradually increases. As the temperature increases, the magnetic force between the first magnet and the second magnet gradually decreases, and slowly becomes smaller than the elastic force of the coil spring. The coil spring pushes the drive pin back into the slide hole. As the drive pin returns to the slide hole, the valve plate moves toward the cooling channel under the action of the reset spring, gradually connecting the second auxiliary hole with the cooling channel, and slowly staggering the first auxiliary hole with the through hole, so that the cooling channel is cooled. The cooling channel cools down the installation cavity and the PCB board inside; as the temperature of the water pump housing on one side of the installation cavity decreases, the temperature of the first magnet and the second magnet decreases, and the magnetic force between the two slowly recovers. After it is greater than the coil spring, the driving pin is pushed out of the sliding hole, and the valve plate is pushed to the side of the through hole, so that the second auxiliary hole and the cooling channel are misaligned, and the first auxiliary hole and the through hole are connected at the same time, so as to cool down the stator assembly and the rotor assembly in the cavity. In this reciprocating manner, the cooling of one side of the installation cavity can be achieved by temperature changes, and the installation cavity is automatically cooled as needed to avoid overheating of the PCB board in the installation cavity.

[0028] 3. When the second temperature sensor detects that the temperature of the installation cavity is too high or reaches the threshold value, the magnetic force of the first magnet and the second magnet is controlled to be reduced, so that the driving pin returns to the sliding hole, and then the valve plate moves toward the driving pin under the action of the reset spring, so that the second secondary hole is connected with the cooling channel; conversely, when the first temperature sensor detects that the temperature in the cavity is too high or reaches the threshold value, the magnetic force of the first magnet and the second magnet is controlled to be enhanced, the driving pin is pushed out of the sliding hole, and then the valve plate is pushed back to the initial position to connect the first secondary hole with the through hole, and at the same time the second secondary hole is isolated from the cooling channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the top view of the structure of an electronic water pump provided by the present invention;

[0031] Figure 2 A schematic diagram of a top view of the structure of an electronic water pump provided by the present invention without an impeller;

[0032] Figure 3 for Figure 1 Structural schematic diagram of the cross section at AA;

[0033] Figure 4A bottom-up structural schematic diagram of an electronic water pump provided by the present invention;

[0034] Icons: 1. Pump housing, 11. Cavity, 12. Mounting cavity, 13. Through hole, 14. Connecting cavity, 141. First delivery pipe, 142. Second delivery pipe, 15. Cooling channel, 151. Cooling section, 152. Connecting section, 153. Output hole, 16. Sliding hole, 161. Guide section, 162. Mounting section, 17. Shielding layer, 2. Impeller, 3. Central axis, 31. Flow channel, 32. Drain hole, 4. Stator assembly, 5. Rotor assembly, 6. PCB board, 7. Valve plate, 71. Main hole, 72. First secondary hole, 73. Second secondary hole, 74. Reset spring, 8. Driving member, 81. Driving pin, 811. Inclined surface, 82. First magnet, 83. Second magnet, 84. Sliding seat, 85. Sealing cover, 86. Coil spring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] Reference Figures 1 to 4 As shown, this embodiment provides an electronic water pump, including a water pump housing 1, an impeller 2, a central shaft 3, a stator assembly 4 and a rotor assembly 5. One end of the water pump housing 1 is sealed and docked with the volute cavity on the engine cylinder block. An annular mounting groove connected end to end is provided at the docking end of the water pump housing 1. A rubber sealing ring is provided in the mounting groove. The rubber sealing ring protrudes from the mounting groove and is used to seal the gap between the water pump housing 1 and the engine cylinder block. The water pump housing 1 is mounted on the engine cylinder block by fixing bolts.

[0039] like Figure 3As shown, the central axis 3 is rotatably arranged on the water pump housing 1, a cavity 11 is opened in the water pump housing 1, the stator assembly 4 is arranged in the cavity 11, the rotor assembly 5 is sleeved on the central axis 3, and the rotor assembly 5 is rotatably arranged in the stator assembly 4; the impeller 2 is sleeved on the central axis 3, and the impeller 2 is located in the volute cavity; both the stator assembly 4 and the rotor assembly 5 are installed with isolation sleeves for sealing and waterproofing; at the same time, the stator assembly 4 is the fixed part of the motor, mainly composed of an iron core, a coil winding and a base. The coil is distributed in the stator iron core. When the current passes through, an induced electromotive force is generated, thereby realizing the conversion of electrical energy. The main function of the stator is to generate a magnetic field and provide the necessary magnetic environment for the operation of the motor. The rotor assembly 5 is the rotating part of the motor, mainly composed of an iron core, a central axis 3, a winding, a magnet, etc. As part of the motor magnetic circuit, the main function of the rotor is to induce electromotive force and generate electromagnetic torque by current. The central axis 3 supports the weight of the rotor and transmits torque, and is the main component for outputting mechanical power.

[0040] The central shaft 3 drives the impeller 2 to rotate, thereby compressing and stretching the air in the volute cavity. Under the action of the one-way valve, positive pressure is formed at the drain port; vacuum is formed at the water pump port, thereby generating a pressure difference with the external atmospheric pressure. Under the action of the pressure difference, water is pressed into the water inlet and then discharged from the drain port. Under the action of the kinetic energy transmitted by the motor, water is continuously sucked in and discharged, forming a relatively stable flow rate.

[0041] More specifically, Figure 3 As shown, the water pump housing 1 is integrally provided with an installation cavity 12, and a PCB board 6 is installed in the installation cavity 12; thus, the heat generated by the PCB board 6 during operation will also be transferred to the water pump housing 1. The water pump housing 1 is made of metal and has a good thermal conductivity.

[0042] like Figure 1-Figure 3 As shown, a flow channel 31 is provided at the center of the central axis 3, and a plurality of drainage holes 32 are provided radially around the portion of the central axis 3 located in the cavity 11, and the plurality of drainage holes 32 are located at the end of the cavity 11 away from the impeller 2. The water pump housing 1 is also provided with a plurality of through holes 13, and the plurality of through holes 13 are distributed in a ring array, and the two ends of the plurality of through holes 13 are connected with the cavity 11 and the volute cavity respectively. In specific implementation, when the impeller 2 is working, a negative pressure is generated in the middle of its end, and a positive pressure is generated at the periphery, and then cooling water is drawn from the central axis 3, and the cooling water enters the cavity 11 from the plurality of through holes 13, and then cools the entire cavity 11, as well as the stator assembly 4 and the rotor assembly 5, and then the cooling water enters the central axis 3 from the plurality of through holes 13 at the lower end of the central axis 3, and then is drawn out from the side close to the impeller 2 and discharged into the volute cavity, and this cycle can cool the water pump housing 1, the PCB board 6, the stator assembly 4 and the rotor assembly 5.

[0043] like Figure 3 and 4As shown, a connecting cavity 14 is also provided on the water pump housing 1, and one end of the central axis 3 away from the impeller 2 is connected to the connecting cavity 14, and the connecting cavity 14 is connected to a first delivery pipe 141; a plurality of cooling channels 15 are arranged at intervals between the installation cavity 12 and the cavity 11 on the water pump housing 1, one end of the plurality of cooling channels 15 is connected to the volute cavity, and the other ends of the plurality of cooling channels 15 are connected to the first delivery pipe 141 through a second delivery pipe 142. In specific implementation, the impeller 2 generates negative pressure inside the central axis 3, and then the negative pressure is used to extract cooling water through the first delivery pipe 141, the plurality of second delivery pipes 142 and each cooling channel 15, and then a part of the cooling water in the volute can flow back into the volute cavity after passing through the cooling channel 15, the second delivery pipe 142, the first delivery pipe 141 and the central axis 3, and then the cooling channel 15 cools the water pump housing 1 and the PCB board 6 on one side of the installation cavity 12.

[0044] like Figure 1-Figure 3 As shown, it also includes a valve plate 7, and the valve plate 7 is slidably arranged on the water pump housing 1. A main hole 71 is opened on the valve plate 7, and the central axis 3 passes through the main hole 71. The diameter of the main hole 71 is larger than the diameter of the central axis 3, so when the valve plate 7 slides in translation, the central axis 3 will not contact the inner wall of the main hole 71, and will not interfere with the movement of the valve plate 7.

[0045] More specifically, the valve plate 7 is provided with a plurality of first auxiliary holes 72, which are respectively connected to the plurality of through holes 13; at the same time, the valve plate 7 is provided with a plurality of second auxiliary holes 73, and when the valve plate 7 is translated to block the plurality of first auxiliary holes 72, the plurality of second auxiliary holes 73 are respectively connected to the plurality of cooling channels 15; when the plurality of first auxiliary holes 72 are aligned with the plurality of through holes 13, the cooling water circulates only in the volute cavity, the inner cavity, the central axis 3 and the volute cavity.

[0046] When the valve plate 7 moves toward the cooling channel 15, the flow rate between the first auxiliary hole 72 and the through hole 13 gradually decreases, while the flow rate between the second auxiliary hole 73 and the cooling channel 15 gradually increases. Part of the cooling water flowing back to the central axis 3 enters the cavity 11 through the through hole 13, and part of it enters the inner cavity of the central axis 3 through the cooling channel 15, the second delivery pipe 142 and the first delivery pipe 141.

[0047] The valve plate 7 continues to move toward the cooling channel 15. When the first auxiliary hole 72 is completely offset from the through hole 13, the second auxiliary hole 73 is connected to the cooling channel 15. At this time, the cooling water only enters from the cooling channel 15 and then flows back from the central shaft 3 to the volute cavity. At this time, the PCB board 6 in the installation cavity 12 is mainly cooled. When the PCB board 6 is cooled to a suitable temperature, the valve plate 7 is reset to block the cooling channel 15 and connect the first auxiliary hole 72 and the through hole 13, so as to cool the stator assembly 4 and the rotor assembly 5 in the cavity 11 again.

[0048] like Figure 1-Figure 3 As shown, it also includes a return spring 74 and a driving member 8. A plurality of return springs 74 are arranged at one end of the valve plate 7. The two ends of the return spring 74 act on the water pump housing 1 and the valve plate 7 respectively. The return spring 74 is located on the side of the plurality of first auxiliary holes 72 away from the second auxiliary holes 73; the driving member 8 is arranged on the side of the valve plate 7 away from the return spring 74, and the driving member 8 is used to drive the valve plate 7 to move toward the side of the return spring 74.

[0049] When implementing it, Figure 2 and Figure 3 As shown, the reset spring 74 is mainly used to push the valve plate 7 toward the cooling channel 15, and the driving member 8 is mainly used to push the valve plate 7 toward the through hole 13. According to the cooling needs, when the cooling channel 15 is not needed to cool the installation cavity 12, the driving member 8 first drives the valve plate 7 to move toward the through hole 13, compresses the reset spring 74 and aligns the first auxiliary holes 72 with the through hole 13, so that the cooling water continues to enter the cavity 11 and flows back to the volute cavity through the central axis 3; and when the cooling channel 15 is needed to cool the installation cavity 12, the driving member 8 is controlled to cancel the action of the valve plate 7, and under the action of the reset spring 74, the valve plate 7 moves toward the cooling channel 15 until the second auxiliary hole 73 is connected with the cooling channel 15 and the first auxiliary hole 72 is misaligned with the through hole 13.

[0050] More specifically, Figure 2 and Figure 3 As shown, the driving member 8 includes a driving pin 81, a sliding hole 16 is opened on the water pump housing 1, the sliding hole 16 is perpendicular to the valve plate 7, the driving pin 81 is slidably set in the sliding hole 16, and a slope 811 is set on the end of the driving pin 81 close to the valve plate 7, and the valve plate 7 slides and abuts against the slope 811. The driving pin 81 is then controlled to move up and down to extend or retract the sliding hole 16. When the driving pin 81 is fully extended out of the sliding hole 16, the valve plate 7 abuts against the driving pin 81. At this time, the return spring 74 is compressed, and the through hole 13 is connected to the first auxiliary hole 72. When the driving pin 81 slowly retreats into the sliding hole 16, the valve plate 7 slides and abuts against the inclined surface 811, and moves toward the cooling channel 15 under the action of the return spring 74 until the driving pin 81 abuts against the end of the inclined surface 811, but does not cover the driving pin 81. Some limit blocks can be set to prevent the valve plate 7 from covering the tip of the driving pin 81, that is, the end of the inclined surface 811. When the driving pin 81 comes out of the sliding hole 16 again, the end of the inclined surface 811 will not abut against the valve plate 7, but the valve plate 7 will be pushed back to the initial position through the inclined surface 811. Here, a corresponding slide rail is provided on the water pump housing 1 to prevent the valve plate 7 from falling off and misalignment, thereby ensuring the normal sliding of the valve plate 7.

[0051] like Figure 2 and Figure 3As shown, the driving member 8 also includes a first magnet 82 and a second magnet 83, the sliding hole 16 includes a guide section 161 and a mounting section 162, a sliding seat 84 is provided at the end of the driving pin 81 away from the inclined surface 811, the driving pin 81 is slidably placed in the guiding section 161, and the sliding seat 84 is slidably placed in the mounting section 162; the first magnet 82 and the second magnet 83 are also provided in the mounting section 162, the first magnet 82 and the second magnet 83 have the same magnetic poles at one end close to each other, and the end of the first magnet 82 away from the second magnet 83 is connected to the sliding seat 84; a sealing cover 85 is provided at the end of the mounting section 162 away from the guiding section 161, and the second magnet 83 is connected to the sealing cover 85.

[0052] When implementing it, Figure 2 and Figure 3 As shown, a coil spring 86 is also included. The coil spring 86 is sleeved on the portion of the driving pin 81 located at the mounting section 162 , and two ends of the coil spring 86 are respectively in contact with the sliding seat 84 and the water pump housing 1 . In the initial state, the elastic force of the spring is smaller than the magnetic force between the first magnet 82 and the second magnet 83, and then under the mutual action of the first magnet 82 and the second magnet 83, the inclined surface 811 of the driving pin 81 is pushed out of the guide section 161 of the sliding hole 16. At this time, the second auxiliary hole 73 and the cooling channel 15 are in a disconnected state, and the cooling water only enters the cavity 11 from the through hole 13 and then enters the inner cavity of the central axis 3. As the running time of the whole machine increases, the heat generated by the PCB board 6 gradually increases, and the temperature of the water pump housing 1 close to the installation cavity 12 also increases sufficiently. Subsequently, the temperature of the first magnet 82 and the second magnet 83 also gradually increases. As the temperature increases, the magnetic force between the first magnet 82 and the second magnet 83 gradually decreases and slowly becomes smaller than the elastic force of the coil spring 86. The coil spring 86 pushes the driving pin 81 back into the sliding hole 16. As the driving pin 81 returns to the sliding hole 16, the valve plate 7 is reset by the spring. Under the action of 74, it moves to the side of the cooling channel 15, gradually connecting the second auxiliary hole 73 with the cooling channel 15, and slowly staggers the first auxiliary hole 72 with the through hole 13, thereby cooling the installation cavity 12 and the PCB board 6 inside through the cooling channel 15; as the temperature of the water pump housing 1 on one side of the installation cavity 12 decreases, the temperature of the first magnet 82 and the second magnet 83 decreases, and the magnetic force between the two slowly recovers. After it is greater than the coil spring 86, the driving pin 81 is pushed out of the sliding hole 16, and the valve plate 7 is pushed to the side of the through hole 13, so that the second auxiliary hole 73 is misaligned with the cooling channel 15, and the first auxiliary hole 72 is connected with the through hole 13, so that the stator assembly 4 and the rotor assembly 5 in the cavity 11 are cooled. In this reciprocating manner, the cooling of one side of the installation cavity 12 can be achieved by temperature changes, and the installation cavity 12 is automatically cooled as needed to avoid overheating of the PCB board 6 in the installation cavity 12.

[0053] More specifically, Figure 2 and Figure 3As shown, a cylindrical shielding layer 17 is provided on the inner wall of the mounting section 162, and the first magnet 82 and the second magnet 83 are both located in the inner cavity of the shielding layer 17. The shielding layer 17 is mainly used to prevent the magnetic fields of the first magnet 82 and the second magnet 83 from affecting the normal operation of the PCB board 6, the stator assembly 4 and the rotor assembly 5.

[0054] More specifically, Figure 3 As shown, the cooling channel 15 includes a cooling section 151, a connecting section 152 and an output hole 153. The length of the cooling section 151 is greater than that of the connecting section 152. The cooling section 151 is located between the sliding hole 16 and the installation cavity 12. The output hole 153 is located between the sliding hole 16 and the through hole 13. The two ends of the connecting section 152 are connected to the output hole 153 and the cooling section 151 respectively. The end of the cooling section 151 away from the connecting section 152 is connected to the second conveying pipe 142, and the output end is inclined and needs to be misaligned with the sliding hole 16. In specific implementation, the cooling channel 15 and the sliding hole 16 are very close to the installation cavity 12, so that the heat on one side of the installation cavity 12 can be transferred in time, the first magnet 82 and the second magnet 83 can be quickly heated and cooled, and it is also convenient to control the temperature on one side of the installation cavity 12. At the same time, the cooling section 151 is located between the sliding hole 16 and the installation cavity 12, and the first magnet 82 and the second magnet 83 in the sliding hole 16 and the PCB board 6 in the installation cavity 12 can be cooled synchronously.

[0055] Embodiment 2:

[0056] Based on Example 1, Figure 2 and Figure 3 As shown, the first temperature sensor and the second temperature sensor are respectively arranged in the cavity 11 and the installation cavity 12; the first magnet 82 or the second magnet 83 is an electromagnet, and the magnetic force between the two can be controlled by controlling the current of the electromagnet. The temperature in the cavity 11 and the temperature in the installation cavity 12 are respectively detected by the first temperature sensor and the second temperature sensor, and then the magnetic force of the first magnet 82 and the second magnet 83 is controlled by the PLC, and the extension and contraction of the driving pin 81 are actively controlled to control the position of the valve plate 7.

[0057] In specific implementation, when the second temperature sensor detects that the temperature of the installation cavity 12 is too high or reaches the threshold value, the magnetic force of the first magnet 82 and the second magnet 83 is controlled to be reduced, so that the driving pin 81 retreats into the sliding hole 16, and then the valve plate 7 moves toward the side of the driving pin 81 under the action of the reset spring 74, so that the second secondary hole 73 is connected with the cooling channel 15; conversely, when the first temperature sensor detects that the temperature in the cavity 11 is too high or reaches the threshold value, the magnetic force of the first magnet 82 and the second magnet 83 is controlled to be enhanced, and the driving pin 81 is pushed out of the sliding hole 16, and then the valve plate 7 is pushed back to the initial position to make the first secondary hole 72 connected with the through hole 13, and at the same time the second secondary hole 73 is isolated from the cooling channel 15.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic water pump, comprising a water pump housing (1), an impeller (2), a central shaft (3), a stator assembly (4) and a rotor assembly (5), wherein one end of the water pump housing (1) is butted against a volute cavity on an engine cylinder block, the central shaft (3) is rotatably arranged on the water pump housing (1), a cavity (11) is provided in the water pump housing (1), the stator assembly (4) is arranged in the cavity (11), the rotor assembly (5) is sleeved on the central shaft (3), and the rotor assembly (5) is rotatably arranged in the stator assembly (4); the impeller (2) is sleeved on the central shaft (3), and the impeller (2) is located in the volute cavity; Features: The water pump housing (1) is integrally provided with a mounting cavity (12), and a PCB board (6) is mounted in the mounting cavity (12); A flow channel (31) is provided at the center of the central axis (3); a portion of the central axis (3) located in the cavity (11) is provided with a plurality of drainage holes (32) radially around the portion; the plurality of drainage holes (32) are located at an end of the cavity (11) away from the impeller (2); and a plurality of through holes (13) are also provided on the water pump housing (1); the two ends of the plurality of through holes (13) are respectively connected to the cavity (11) and the volute cavity.

2. An electronic water pump according to claim 1, characterized in that: The water pump housing (1) is also provided with a communication cavity (14), one end of the central shaft (3) away from the impeller (2) is in communication with the communication cavity (14), and the communication cavity (14) is in communication with a first delivery pipe (141); A plurality of cooling channels (15) are provided at intervals between the installation cavity (12) and the cavity (11) on the water pump housing (1), one end of each of the cooling channels (15) is connected to the volute cavity, and the other ends of each of the cooling channels (15) are connected to the first delivery pipe (141) via a second delivery pipe (142).

3. An electronic water pump according to claim 2, characterized in that: It also comprises a valve plate (7), the valve plate (7) being slidably arranged on the water pump housing (1), the valve plate (7) being provided with a main hole (71), the central axis (3) passing through the main hole (71), and the diameter of the main hole (71) being larger than the diameter of the central axis (3); The valve plate (7) is also provided with a plurality of first auxiliary holes (72), and the plurality of first auxiliary holes (72) are respectively connected to the plurality of through holes (13); The valve plate (7) is also provided with a plurality of second auxiliary holes (73). When the valve plate (7) is translated to block the plurality of first auxiliary holes (72), the plurality of second auxiliary holes (73) are respectively connected to the plurality of cooling channels (15).

4. An electronic water pump according to claim 3, characterized in that: It also includes a return spring (74) and a driving member (8), wherein one end of the valve plate (7) is provided with a plurality of return springs (74), and the two ends of the return spring (74) act on the water pump housing (1) and the valve plate (7) respectively, and the return spring (74) is located on a side of the plurality of first auxiliary holes (72) away from the second auxiliary holes (73); The driving member (8) is arranged on a side of the valve plate (7) away from the return spring (74), and the driving member (8) is used to drive the valve plate (7) to move toward the side of the return spring (74).

5. An electronic water pump according to claim 4, characterized in that: The driving member (8) comprises a driving pin (81). A sliding hole (16) is provided on the water pump housing (1). The sliding hole (16) is perpendicular to the valve plate (7). The driving pin (81) is slidably arranged in the sliding hole (16). An inclined surface (811) is provided at the end of the driving pin (81) close to the valve plate (7). The valve plate (7) is in sliding contact with the inclined surface (811).

6. An electronic water pump according to claim 5, characterized in that: The driving member (8) further comprises a first magnet (82) and a second magnet (83); the sliding hole (16) comprises a guide section (161) and a mounting section (162); a sliding seat (84) is provided at one end of the driving pin (81) away from the inclined surface (811); the driving pin (81) is slidably placed on the guiding section (161); and the sliding seat (84) is slidably placed on the mounting section (162); The first magnet (82) and the second magnet (83) are also arranged in the installation section (162); the ends of the first magnet (82) and the second magnet (83) that are close to each other have the same magnetic poles, and the end of the first magnet (82) that is away from the second magnet (83) is connected to the slide seat (84); A sealing cover (85) is provided at one end of the mounting section (162) away from the guiding section (161), and the second magnet (83) is connected to the sealing cover (85).

7. An electronic water pump according to claim 6, characterized in that: It also includes a coil spring (86), which is sleeved on the portion of the drive pin (81) located at the mounting section (162), and the two ends of the coil spring (86) are respectively in contact with the slide seat (84) and the water pump housing (1).

8. An electronic water pump according to claim 7, characterized in that: A cylindrical shielding layer (17) is provided on the inner wall of the mounting section (162), and the first magnet (82) and the second magnet (83) are both located in the inner cavity of the shielding layer (17).

9. An electronic water pump according to claim 8, characterized in that: The cooling channel (15) comprises a cooling section (151), a connecting section (152) and an output hole (153); the length of the cooling section (151) is greater than the length of the connecting section (152); and the cooling section (151) is located between the sliding hole (16) and the mounting cavity (12); The output hole (153) is located between the sliding hole (16) and the through hole (13); two ends of the connecting section (152) are respectively connected to the output hole (153) and the cooling section (151); and one end of the cooling section (151) away from the connecting section (152) is connected to the second conveying pipe (142).

10. An electronic water pump according to claim 9, characterized in that: A first temperature sensor and a second temperature sensor are respectively arranged in the cavity (11) and the installation cavity (12); The first magnet (82) or the second magnet (83) is an electromagnet.

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