Electronic water pump motor end cooling circulation flow channel

Abstract

The application discloses an electronic water pump motor end cooling circulation flow channel, comprising a pump body, wherein a total inflow port is arranged on the pump body, a shielding sleeve is arranged in the pump body, an impeller assembly is connected to the shielding sleeve and faces the total inflow port, the shielding sleeve comprises a positioning shaft, the impeller assembly comprises an impeller inner wall, a positioning block is arranged on the impeller inner wall, the positioning block is clamped with the positioning shaft, and a backflow channel is formed between the positioning block, the impeller inner wall and the positioning shaft. The electronic water pump motor end cooling circulation flow channel can uniformly distribute the cooling liquid in the backflow process, avoids collision, ensures that the cooling liquid can smoothly flow into the backflow channel, and improves backflow stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic water pumps, in particular to an electronic water pump motor end cooling circulation flow channel. BACKGROUND

[0002] Electronic water pumps are used to deliver cooling liquid to various components that need to be cooled, but the motor of the electronic water pump itself generates a large amount of heat, and the operating environment temperature also directly affects the heat dissipation of the motor end. Therefore, in order to effectively dissipate heat inside the electronic water pump, protect the circuit safety and stable operation, an internal cooling circulation flow channel is designed in the electronic water pump to guide the internal circulation of part of the cooling liquid, thereby achieving the cooling and cooling effect of the electronic water pump itself.

[0003] For example, the publication number "CN218439908U" discloses a "cooling structure of electronic water pump", which comprises: a pump head, a front bearing seat and a motor shell connected in sequence; a shielding cover is arranged in the motor shell, and the space surrounded by the front bearing seat and the motor shell is divided into first and second cavities which are independent and sealed from each other; a rotating shaft is arranged in the first cavity, and a motor assembly is arranged in the second cavity; a liquid passage is arranged on the front bearing seat, so that the cooling medium passes through the fluid cavity in the impeller, enters the first cavity through the liquid passage, and flows back to the inlet of the impeller through the central through hole arranged in the rotating shaft. However, in actual application, when the cooling liquid in each direction flows back to the backflow channel on the central shaft, collision occurs, and the backflow effect is poor. SUMMARY

[0004] In view of the poor backflow effect of the existing technology mentioned in the background, the present application provides an electronic water pump motor end cooling circulation flow channel, which can evenly distribute the cooling liquid during the backflow process, avoid collision, ensure that the cooling liquid can flow smoothly into the backflow channel, and improve the backflow stability.

[0005] The second application purpose of the present application is to reduce the cavitation effect on the water pump during operation, reduce the vibration noise of the water pump, and prolong the service life of the water pump.

[0006] The third application purpose of the present application is to adapt to the flow rate of the cooling liquid, improve the flow efficiency, and accelerate the formation of the cooling liquid circulation flow channel.

[0007] To achieve the above-mentioned purposes, the present application adopts the following technical solutions.

[0008] The utility model provides an electronic water pump motor end cooling circulation flow channel, including the pump body, be provided with total inflow port on the pump body, be equipped with the shield sleeve in the pump body, the shield sleeve is connected with the impeller assembly opposite total inflow port, the shield sleeve includes the positioning shaft, the impeller assembly includes the impeller inner wall, be provided with the positioning block on the impeller inner wall, the positioning block is engaged with the positioning shaft, and the positioning block forms the backflow channel with the impeller inner wall, the positioning shaft, the impeller assembly includes the impeller inner wall, the impeller inner wall adjusts the positioning shaft, and be provided with a plurality of positioning blocks on the impeller inner wall, and the positioning block is positioned through the engagement connection with the positioning shaft, and leave the gap between each positioning block, and the impeller inner wall has the rest area in addition to the positioning block, and these areas form the backflow channel with the positioning block and the positioning shaft, and the cooling liquid of total inflow port enters and is cooled to the subsequent all components and electronic water pump of being connected with electronic water pump, and the part of the cooling liquid of total inflow port is shunted into the required component and is cooled in the specified position, and the backflow channel is backflowed to total inflow port to the part of cooling liquid that enters the water pump internal circulation, wherein the pump body is also provided with the outflow port corresponding to total inflow port, and the rest cooling liquid of circulating in the pump body is transported to the subsequent component, and the backflow channel is formed with a plurality of annular flow channels on the cross section with the positioning shaft as the axis, so when the cooling liquid of each direction is backflowed to the vicinity of the positioning shaft, it is directly flowed into the backflow channel, avoids the collision of the cooling liquid of each direction to the rotation center, improves the flow efficiency, reduces the air bubble generation in the cooling liquid, and guarantees the cooling quality of the cooling liquid, further, since the backflow channel is arranged between the positioning block, the positioning shaft and the impeller inner wall, the positioning shaft and the positioning block can be lubricated during the backflow process of the cooling liquid, the friction loss and friction resistance are reduced, the rotation fluency of the impeller assembly is improved, and since the impeller inner wall is not completely sleeved with the positioning shaft, but is locally engaged with the positioning block, the friction resistance of the impeller assembly is further reduced, and since the diameter of the impeller inner wall is larger than that of the positioning shaft, the impeller assembly is easier to process, and the size of the flow channel needs to be adjusted in different sizes and application environments, compared with drilling holes on the positioning shaft, the impeller assembly is generally processed by a plastic factory, the cost of changing the size and shape of the positioning block during the injection molding process of the impeller assembly is lower, and the processing procedure can be reduced, and the drilling size of the backflow channel on the shaft needs to be accurately grasped to ensure that the backflow circulation effect of the cooling liquid reaches the expectation, which requires a higher processing technology and higher cost.

[0009] As preferred, the impeller assembly comprises an impeller back cover plate, the impeller back cover plate is provided with a booster flow port, the booster flow port is arranged opposite to the total inlet port, and the booster flow port is communicated with the backflow channel. The impeller back cover plate is opposite to the total inlet port and is impacted by the water flow of the total inlet port. Since the pressure of the total inlet port is low, the cooling liquid is accelerated to generate a high pressure area after rotating through the impeller assembly. During the flow of the fluid from the low pressure area to the high pressure area, cavitation phenomenon occurs, which causes noise and vibration of the water pump, and seriously damages the internal components of the water pump. Therefore, the communication of the backflow channel and the booster flow port increases the pressure of the total inlet port, thereby reducing the pressure difference between the total inlet port and the internal part of the water pump, improving the cavitation performance of the water pump, reducing the generation of vibration and noise, protecting the structural integrity of the internal components, and circulating the cooling liquid back to the total inlet port to form a circulating flow channel. This scheme achieves the second invention purpose of the present application.

[0010] As preferred, a flow storage gap is arranged between the booster flow port and the end of the positioning shaft. The flow storage gap arranged between the booster flow port and the positioning shaft can collect the cooling liquid from the backflow channel and then discharge it from the booster flow port, avoiding the decrease of the discharge efficiency of the cooling liquid in each backflow channel at the booster flow port due to the small size of the booster flow port, and providing a transition area for the collection of the cooling liquid.

[0011] As preferred, a floating piston is movably connected to the positioning shaft near the flow storage gap. The floating piston arranged on the positioning shaft can adaptively expand and contract according to the pressure and volume of the cooling liquid in the flow storage gap, so as to ensure that the cooling liquid in the flow storage gap can maintain constant discharge to the booster flow port. When the cooling liquid just enters the pump body for circulation or the flow is small, the flow storage gap cannot be quickly or fully filled with cooling liquid, and the transition and collection of the flow storage gap will reduce the high pressure kinetic energy of the cooling liquid, slow down the flow efficiency of the cooling liquid, and reduce the boosting effect of the total inlet port. When the floating piston is arranged, the floating piston extends out of the positioning shaft more due to insufficient pressure of the cooling liquid on the floating piston at this time, so the flow storage gap space is compressed, the air in the flow storage gap is eliminated, the cooling liquid between the backflow channel and the total inlet port is quickly connected, the cooling liquid can maintain high pressure and fast flow, the effects of fast flow and reducing cavitation are achieved, and a boost force is generated on the cooling liquid in the flow storage gap, thereby improving the flow efficiency. When the cooling liquid in the flow storage gap increases, the floating piston automatically retracts under high pressure to provide more flow storage gap space and generate a greater counter thrust to help the cooling liquid flow out quickly to adapt to the high pressure flow rate of the cooling liquid. At the same time, under the action of the counter thrust of the floating piston, the cavity in the flow storage gap is eliminated, the fluid stability is improved, the flow channel is improved, the air bubbles generated in the cooling liquid collection process are reduced, the flow efficiency is improved, the circulation cooling quality is improved, and the third invention purpose of the present application is achieved.

[0012] As preferred, the positioning shaft is provided with a sealing hole, the sealing hole is sleeved with a floating piston, an elastic member is arranged between the bottom of the sealing hole and the floating piston, and an atmosphere hole is connected to the side of the sealing hole away from the storage gap. The sealing hole is arranged on the positioning shaft, the sealing hole is slidably connected with the floating piston, the floating piston is tightly attached to the side wall of the sealing hole, sealing is achieved, and the cooling liquid is prevented from flowing out of the storage gap. The elastic member provides a counterthrust, the compression degree of the elastic member is self-adaptively changed according to the filling volume and the pressure change of the cooling liquid in the storage gap, the floating piston is still connected with the sealing hole in the initial state of the elastic member, the elastic member is fixedly connected with the bottom of the sealing hole, so that the floating piston is prevented from being separated from the sealing hole in the state of not being subjected to external pressure, and the atmosphere hole is arranged on the side of the sealing hole away from the storage gap, so as to communicate with the external environment, to stabilize the pressure in the sealing hole, and to ensure that the elastic member can smoothly push the floating piston out. The main function of the atmosphere hole is to adapt to the pressure difference, and the size precision requirement is not high, so the processing cost is low.

[0013] As preferred, a flow guide is arranged in the storage gap, and the flow guide comprises a contraction port arranged close to the pressurized flow port. The flow guide arranged in the storage gap can guide and collect the cooling liquid in each backflow channel, and gradually shrink in the process close to the contraction port, so as to avoid irregular flow of the cooling liquid in the storage gap, reduce kinetic energy loss and generation of air bubbles, ensure stable flow of the cooling liquid, and improve backflow quality.

[0014] As preferred, the impeller assembly comprises an impeller outer wall, the impeller outer wall is sleeved with the shielding sleeve, a cooling flow channel is arranged between the impeller outer wall and the shielding sleeve, one end of the cooling flow channel is communicated with the total inflow port, and the other end is communicated with the backflow channel. The cooling flow channel is communicated with the total inflow port and the backflow channel, so that a cooling circulation channel is formed in the water pump, and the working temperature in the water pump is reduced.

[0015] As preferred, a backflow curved surface is arranged on the shielding sleeve, and the backflow curved surface is arranged between the cooling flow channel and the backflow channel. The backflow curved surface is arranged between the cooling flow channel and the backflow channel, can smoothly divert the cooling liquid in the cooling flow channel to the backflow channel, avoid turbulence in the interior, improve flow efficiency, reduce energy loss and generation of air bubbles.

[0016] As preferred, a permanent magnet is arranged in the impeller assembly, a motor stator assembly is arranged on the side of the shielding sleeve away from the impeller assembly, and the motor stator assembly can generate a magnetic field by being electrified to drive the impeller assembly to rotate. The rotation of the impeller assembly forms a changing magnetic field through the motor stator assembly in the water pump after being electrified, and the permanent magnet arranged in the impeller assembly rotates following the magnetic field, so as to form a non-contact driving of the impeller assembly, and the sealing property of the shielding sleeve is ensured.

[0017] As preferred, the impeller assembly comprises an impeller flow channel, which is connected with the total inlet and the cooling channel. The rotation of the impeller assembly drives the cooling liquid in the total inlet to pass through the impeller flow channel and be transmitted to the cooling channel, which is diffused and delivered to the cooling channel on the both sides while accelerating the cooling liquid, increases the flow area of the cooling liquid in the water pump, and improves the cooling effect, wherein the impeller flow channel comprises an impeller inlet and an impeller outlet, the impeller inlet is connected with the total inlet, and the impeller outlet is connected with the cooling flow channel.

[0018] The beneficial effects of the present application are as follows:

[0019] (1) The backflow channel is processed in the injection molding process of the impeller assembly, which reduces the machining process of the positioning shaft, reduces the production cost, avoids the accumulation of the cooling liquid at the rotation center in the backflow process, reduces the kinetic energy loss, improves the flow efficiency, and maximizes the lubrication of the impeller assembly to reduce friction;

[0020] (2) The backflow channel and the total inlet are connected through the pressurized flow port to realize the circulation flow, and the high-pressure cooling liquid in the backflow channel is discharged to the total inlet, thereby improving the fluid pressure of the total inlet and reducing the cavitation effect;

[0021] (3) The storage gap is used to collect and transition the cooling liquid in each backflow channel to ensure that the cooling liquid can smoothly pass through the pressurized flow port;

[0022] (4) The floating valve adapts to the volume and pressure of the cooling liquid in the storage gap, avoids the generation of gaps in the storage gap, reduces the generation of bubbles, improves the flow efficiency, and provides suitable counterforce to the cooling liquid to speed up the flow. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application.

[0024] Figure 2 is a partial schematic diagram of the present application.

[0025] Figure 3 is Figure 1 is a structural schematic diagram of the impeller assembly in the embodiment 1.

[0026] Figure 4 is Figure 3 is a sectional view of A-A in the embodiment 1.

[0027] Figure 5 is Figure 2 is a structural schematic diagram of the shielding sleeve.

[0028] Figure 6 is a structural schematic diagram of the embodiment 2.

[0029] Figure 7 is a structural schematic diagram of the embodiment 3.

[0030] Figure 8 is a cross-sectional view of the flow guide in Example 3.

[0031] In the figure: 1 pump body, 11 total flow inlet, 2 shield sleeve, 21 positioning shaft, 22 backflow curved surface, 3 impeller assembly, 31 impeller inner wall, 32 positioning block, 33 impeller back cover plate, 34 pressurized flow port, 35 impeller outer wall, 4 backflow channel, 5 storage gap, 51 flow guide, 511 contraction port, 6 floating piston, 61 sealing hole, 62 elastic member, 63 atmospheric hole, 7 cooling flow channel, 8 motor stator assembly, 9 impeller flow channel. DETAILED DESCRIPTION

[0032] The application will be further described below in conjunction with the drawings and specific examples.

[0033] Example 1:

[0034] As shown in Figure 1 , 2 , 3, 4, 5, an electronic water pump motor end cooling circulation flow channel comprises a pump body 1, the pump body 1 is provided with a total flow inlet 11, the pump body 1 is provided with a shield sleeve 2, the shield sleeve 2 is connected with an impeller assembly 3 opposite to the total flow inlet 11, the shield sleeve 2 comprises a positioning shaft 21, the impeller assembly 3 comprises an impeller inner wall 31, the impeller inner wall 31 is provided with a positioning block 32, the positioning block 32 is clamped with the positioning shaft 21, and the positioning block 32, the impeller inner wall 31 and the positioning shaft 21 form a backflow channel 4.

[0035] The impeller assembly 3 comprises an impeller inner wall 31 for adjusting and positioning the positioning shaft 21, and two positioning blocks 32 are arranged on the impeller inner wall 31, the positioning blocks 32 are connected with the positioning shaft 21 through clamping connection, the impeller assembly 3 is positioned, and gaps are left between the positioning blocks 32. In addition to the positioning blocks 32, the impeller inner wall 31 has other regions, which form the backflow channel 4 with the positioning blocks 32 and the positioning shaft 21. The cooling liquid flows back through the backflow channel 4, and the backflow channel 4 is a plurality of annular flow channels with the positioning shaft 21 as the center in the cross section. Therefore, when the cooling liquid in each direction flows back to the vicinity of the positioning shaft 21, it directly flows into the backflow channel 4, avoiding the collision of the cooling liquid in each direction flowing to the rotation center, improving the flow efficiency, reducing the generation of bubbles in the cooling liquid, and ensuring the cooling quality of the cooling liquid. Further, since the backflow channel 4 is arranged between the positioning blocks 32, the positioning shaft 21 and the impeller inner wall 31, the cooling liquid can lubricate the space between the positioning shaft 21 and the positioning blocks 32 during the backflow process, reducing friction loss and friction resistance, thereby improving the rotation fluency of the impeller assembly 3. In addition, since the impeller inner wall 31 is not completely sleeved with the positioning shaft 21, but is locally clamped by the positioning blocks 32, the friction resistance of the impeller assembly 3 is further reduced. In addition, since the diameter of the impeller inner wall 31 is larger than that of the positioning shaft 21, it is easier to process than the positioning shaft 21. In addition, the size of the flow channel needs to be adjusted in different sizes and application environments. Compared with drilling holes in the positioning shaft 21, the impeller assembly 3 is generally processed by a plastic factory, and the cost of changing the size and shape of the positioning block 32 during the injection molding process of the impeller assembly 3 is lower, and the processing procedure can be reduced.

[0036] As shown in Figure 3 The impeller assembly 3 comprises an impeller rear cover plate 33, and a pressurized flow port 34 is arranged on the impeller rear cover plate 33. The pressurized flow port 34 is arranged opposite to the total inflow port 11, and the pressurized flow port 34 is in communication with the backflow channel 4.

[0037] The impeller rear cover plate 33 is opposite to the total inflow port 11 and is impacted by the water flow of the total inflow port 11. Since the pressure of the total inflow port 11 is low, the cooling liquid will accelerate to form a high pressure area after rotating through the impeller assembly 3. During the flow of the fluid from the low pressure area to the high pressure area, cavitation phenomenon will occur, which will cause noise and vibration of the water pump, and will seriously erode the internal components of the water pump, causing damage. Therefore, the communication between the backflow channel 4 and the pressurized flow port 34 increases the pressure of the total inflow port 11, thereby reducing the pressure difference between the total inflow port 11 and the internal part of the water pump, improving the cavitation performance of the water pump, reducing the generation of vibration and noise, protecting the structural integrity of the internal components, and circulating the cooling liquid back to the total inflow port 11 to form a circulating flow channel.

[0038] As shown in Figure 2As shown, the pressurized flow port 34 and the end of the positioning shaft 21 are provided with a storage flow gap 5. The storage flow gap 5 is provided between the pressurized flow port 34 and the positioning shaft 21, which can collect the cooling liquid from the return flow channels 4 and then discharge from the pressurized flow port 34, avoiding the decrease of the discharge efficiency of the cooling liquid in each return flow channel 4 at the pressurized flow port 34 due to the small size of the pressurized flow port 34, and providing a transition area for the collection of the cooling liquid.

[0039] As shown in the figure, Figure 2 The impeller assembly 3 includes an impeller outer wall 35, which is sleeved with the shielding sleeve 2. A cooling flow channel 7 is provided between the impeller outer wall 35 and the shielding sleeve 2, and one end of the cooling flow channel 7 is in communication with the total inflow port 11, and the other end is in communication with the return flow channel 4. The shielding sleeve 2 is provided with a return flow curved surface 22, which is arranged between the cooling flow channel 7 and the return flow channel 4.

[0040] The total inflow port 11 and the return flow channel 4 are connected through the cooling flow channel 7, so that a cooling circulation channel is formed inside the water pump, thereby reducing the working temperature inside the water pump. The return flow curved surface 22 is arranged between the cooling flow channel 7 and the return flow channel 4, which can smoothly divert the cooling liquid in the cooling flow channel 7 to the return flow channel 4, avoid the formation of turbulence inside, improve the flow efficiency, reduce energy loss and the generation of bubbles.

[0041] As shown in the figure, Figure 1 The impeller assembly 3 is provided with a permanent magnet, and the motor stator assembly 8 is arranged on the side of the shielding sleeve 2 away from the impeller assembly 3. The motor stator assembly 8 can generate a magnetic field by electrification to drive the impeller assembly 3 to rotate. The rotation of the impeller assembly 3 forms a changing magnetic field through the electrification of the motor stator assembly 8 inside the water pump, and the permanent magnet arranged in the impeller assembly 3 rotates following the magnetic field, thereby forming a non-contact driving of the impeller assembly 3, and ensuring the sealing of the shielding sleeve 2.

[0042] As shown in the figure, Figure 2 The impeller assembly 3 includes an impeller flow channel 9, which is in communication with the total inflow port 11 and the cooling channel. The rotation of the impeller assembly 3 drives the cooling liquid of the total inflow port 11 to be transmitted to the cooling channel through the impeller flow channel 9, which expands to the left and right and is delivered to the cooling channel while accelerating and pressurizing the cooling liquid, thereby increasing the flow area of the cooling liquid inside the water pump and improving the cooling effect.

[0043] The assembling and working process of the electronic water pump motor end cooling circulation flow channel in the embodiment is as follows: in the embodiment, the motor stator assembly 8 is installed in the pump body 1, then the shield sleeve 2 is fixed in the pump body 1, the impeller inner wall 31 is installed in alignment with the positioning shaft 21, so that the two symmetrically arranged positioning blocks 32 on the impeller inner wall 31 are clamped with the positioning shaft 21, then the pump body 1 is capped and installed, in the working process, the cooling liquid flows into the pump body 1 through the total inflow port 11 on the cover, after the motor stator assembly 8 is electrified, the impeller assembly 3 is driven to rotate around the positioning shaft 21, the impeller assembly 3 delivers the cooling liquid to the cooling flow channel 7 through the impeller flow channel 9, the cooling flow channel 7 further transmits the cooling liquid to the return flow channel 4 through the return flow curved surface 22, wherein the return flow channel 4 is stacked to be provided with two, the cooling liquid in different directions towards the rotation center is collected into the similar return flow channel 4, so as to avoid the collision between them, the cooling liquid in the two return flow channels 4 lubricates the positioning shaft 21 and the positioning block 32, then is collected when passing through the storage gap 5, and is discharged from the pressure-increasing flow port 34 to the total inflow port 11 to realize circulation and increase the pressure of the total inflow port 11, so as to reduce the cavitation.

[0044] Embodiment 2:

[0045] As shown in Figure 6 different from embodiment 1, in the embodiment, the positioning shaft 21 is movably connected with the floating piston 6 near one side of the storage gap 5, the positioning shaft 21 is provided with the sealing hole 61, the sealing hole 61 sleeves the floating piston 6, the elastic member 62 is arranged between the bottom of the sealing hole 61 and the floating piston 6, in the embodiment, the elastic member is a spring, and the sealing hole 61 is connected with the atmosphere hole 63 away from one side of the storage gap 5.

[0046] The floating piston 6 arranged on the positioning shaft 21 can adaptively expand or contract according to the pressure in the storage gap 5 and the volume of the cooling liquid, so that the cooling liquid in the storage gap 5 can keep the constant discharge pressure outlet 34. When the cooling liquid just enters the pump body 1 for circulation or the flow is small, the storage gap 5 cannot be quickly or fully filled with the cooling liquid, and the cooling liquid high-pressure kinetic energy is reduced due to the transition and collection of the storage gap 5, the cooling liquid flow efficiency is slow, and the pressure boosting effect of the total inlet 11 is reduced. When the floating piston 6 is arranged, the floating piston 6 protrudes out of the positioning shaft 21 more due to insufficient pressure of the cooling liquid on the floating piston 6 at this time, so that the space of the storage gap 5 is compressed, the air in the storage gap 5 is eliminated, the cooling liquid between the return flow channel 4 and the total inlet 11 is quickly connected, the cooling liquid can keep high pressure and fast flow, the effect of fast flow and reducing cavitation is achieved, and a boost force is generated on the cooling liquid in the storage gap 5, so that the flow efficiency is improved. When the cooling liquid in the storage gap 5 increases, the floating piston 6 automatically retracts under high pressure to provide more space for the storage gap 5 and generate a greater back pressure to help the cooling liquid flow out quickly to adapt to the high-pressure flow rate of the cooling liquid. At the same time, under the back pressure of the floating piston 6, the air bubbles generated in the cooling liquid collection process are reduced, the flow efficiency is improved, the circulation cooling quality is improved, the sealing hole 61 arranged on the positioning shaft 21 is in sliding connection with the floating piston 6, and the floating piston 6 is tightly attached to the side wall of the sealing hole 61 to realize sealing and prevent the cooling liquid from flowing out of the storage gap 5. The back pressure is provided by the elastic member 62, the compression degree of the elastic member 62 is adaptively expanded and contracted according to the filling volume and pressure change of the cooling liquid in the storage gap 5, the atmosphere hole 63 is arranged on the side of the sealing hole 61 away from the storage gap 5 to connect the outside environment, so that the pressure in the sealing hole 61 is stable, and the elastic member 62 can smoothly push out the floating piston 6.

[0047] Embodiment 3:

[0048] As shown in Figure 7 , 8 different from embodiment 1, a flow guide 51 is arranged in the storage gap in this embodiment, and the flow guide 51 includes a contraction port 511 arranged close to the pressure outlet. The flow guide 51 arranged in the storage gap can guide and collect the cooling liquid in each return flow channel, and gradually contract in the process close to the contraction port 511, so as to avoid irregular flow of the cooling liquid in the storage gap, reduce kinetic energy loss and air bubble generation, ensure stable flow of the cooling liquid, and improve return flow quality.

[0049] In addition to the above-mentioned embodiments, within the scope disclosed by the claims and specification of the present application, the technical features of the present application can be reselected and combined to constitute new embodiments, which can be realized by those skilled in the art without creative labor, and therefore these embodiments of the present application which are not described in detail should be considered as specific embodiments of the present application and within the protection scope of the present application.

Claims

1. A cooling circulation channel at the motor end of an electronic water pump, comprising a pump body, wherein the pump body is provided with a total inlet, characterized in that: A shielding sleeve is provided within the pump body, and an impeller assembly facing the total inlet is connected to the shielding sleeve, and the shielding sleeve includes a positioning shaft, and the impeller assembly includes an impeller inner wall, and a positioning block is provided on the impeller inner wall, and the positioning block is engaged with the positioning shaft, and a reflux channel is formed between the positioning block, the impeller inner wall and the positioning shaft; the impeller assembly includes an impeller rear cover plate, and a boost flow port is provided on the impeller rear cover plate, and a flow storage gap is provided between the boost flow port and the end of the positioning shaft; a floating piston is movably connected to the side of the positioning shaft close to the flow storage gap; a sealing hole is provided on the positioning shaft, and the sealing hole is sleeved with the floating piston, and an elastic member is provided between the bottom of the sealing hole and the floating piston.

2. The cooling circulation channel at the motor end of an electronic water pump according to claim 1, characterized in that: The boost flow port is arranged opposite to the total inlet, and the boost flow port is communicated with the reflux channel.

3. The cooling circulation channel at the motor end of an electronic water pump according to claim 1, characterized in that: The sealing hole is connected to a large air hole on a side away from the fluid storage gap.

4. The cooling circulation channel at the motor end of an electronic water pump according to claim 1, characterized in that: A guide body is arranged in the flow storage gap, and the guide body includes a contraction port arranged close to the pressurized flow port.

5. The cooling circulation channel at the motor end of an electronic water pump according to any one of claims 1 to 4, characterized in that: The impeller assembly includes an impeller outer wall, which is sleeved with a shielding sleeve. A cooling channel is provided between the impeller outer wall and the shielding sleeve. One end of the cooling channel is connected to the main inlet, and the other end is connected to the return channel.

6. The cooling circulation channel at the motor end of an electronic water pump according to claim 5, characterized in that: The shielding sleeve is provided with a return curved surface, and the return curved surface is arranged between the cooling flow channel and the return channel.

7. The cooling circulation channel at the motor end of an electronic water pump according to any one of claims 1 to 4, characterized in that: A permanent magnet is arranged in the impeller assembly, and a motor stator assembly is arranged on the side of the shielding sleeve away from the impeller assembly. The motor stator assembly can be energized to generate a magnetic field to drive the impeller assembly to rotate.

8. The cooling circulation channel at the motor end of an electronic water pump according to any one of claims 1 to 4, characterized in that: The impeller assembly includes an impeller flow channel, and the impeller flow channel is connected with the main inlet and the cooling channel.

Images