Water inlet structure of electronic water pump, electronic water pump and water inlet method applying same

Abstract

The invention discloses a water inlet structure of an electronic water pump, the electronic water pump and a water inlet method applying the electronic water pump, and relates to the technical field of electronic water pumps and parts thereof. The clearance compensation assembly at least comprises a floating ring component, and the floating ring component is movably arranged in a water inlet of a pump cover component. The rotor-impeller assembly is at least provided with an impeller water suction opening extending in the axial direction. The impeller water suction port of the rotor-impeller assembly is inserted into the inner ring of the floating ring component of the clearance compensation assembly in a clearance fit mode. The problem of how to provide a water inlet structure capable of reducing the backflow phenomenon for the electronic water pump is mainly solved. The backflow phenomenon of the electronic water pump can be considerably inhibited, so that the operation efficiency of the electronic water pump is improved, the floating ring component can reduce dynamic and static friction of the electronic water pump, the mute performance and the operation stability are improved, the service life is prolonged, and the electronic water pump has the advantages of being compact and reliable in structure, easy to assemble, high in consistency and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic water pumps and parts thereof, in particular to a water inlet structure of an electronic water pump, an electronic water pump and a water inlet method using the same. BACKGROUND

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control, so they are widely used in automobiles, household appliances and industrial equipment. For example, new energy vehicles are usually equipped with two or more electronic water pumps as the power source of the entire cooling system.

[0003] The impeller of an electronic water pump is a moving part. Specifically, the impeller will be in a high-speed rotating state when the electronic water pump is running, and the pump cover of the electronic water pump is a stationary part. In order to avoid friction between the impeller and the pump cover, causing abnormal noise and mechanical wear, a safety gap of 0.5 mm or more is usually reserved between the impeller and the pump cover.

[0004] However, when the water inlet of the electronic water pump is integrated at the pump cover and close to the impeller, the safety gap between the impeller and the pump cover will cause backflow at the water inlet of the electronic water pump under the action of pressure difference. As a key component of the volume loss of the electronic water pump, the above-mentioned backflow affects the performance, efficiency and stability of the electronic water pump, especially for electronic water pumps with high head and low flow, the negative impact of backflow will account for a higher proportion.

[0005] The Chinese utility model patent publication texts with publication numbers CN216742140U and CN218266477U, both entitled "Gap sealing structure between impeller and pump cover of water pump", add a compensation structure to the impeller and / or pump cover to reduce the gap between the impeller and the pump cover near the water inlet, thereby reducing backflow. However, the above-mentioned compensation structure will inevitably cause friction between the impeller and the pump cover or the compensation structure when the impeller rotates, which again causes abnormal noise and mechanical wear.

[0006] In summary, how to provide an electronic water pump with a water inlet structure that can reduce backflow without causing dynamic friction has become one of the problems to be solved. SUMMARY

[0007] The present application provides a water inlet structure of an electronic water pump, an electronic water pump and a water inlet method using the same, which can effectively reduce the backflow of the electronic water pump.

[0008] In order to achieve the above object, the present application provides the following technical scheme: A water inlet structure of an electronic water pump is applied to the electronic water pump; the electronic water pump at least comprises a pump cover component and a rotor-impeller assembly; an impeller chamber is formed on the inner side of the pump cover component, and a water inlet and a water outlet which are communicated with the inside and outside of the impeller chamber are respectively formed on the pump cover component; at least a part of the rotor-impeller assembly can rotate in the impeller chamber of the pump cover component; the electronic water pump further comprises a gap compensation assembly; the gap compensation assembly at least comprises a floating ring component which is movably arranged in the water inlet of the pump cover component; the rotor-impeller assembly is at least provided with an impeller water suction port which extends in the axial direction; the impeller water suction port of the rotor-impeller assembly is inserted into the inner ring of the floating ring component of the gap compensation assembly in a gap fit manner.

[0009] In the above technical scheme, the water inlet of the pump cover component is expanded on one side in the impeller chamber to form a compensation fit part; the floating ring component is movably arranged in the compensation fit part of the water inlet in a manner suitable for circumferential rotation, axial translation and radial translation.

[0010] In the above technical scheme, the gap compensation assembly further comprises a fixed ring component; the fixed ring component comprises a fixed rib part and a support body part which extends radially inward from the fixed rib part; the compensation fit part of the water inlet is sequentially arranged as an impeller fit subpart, a floating ring limiting subpart and an assembly subpart from outside to inside in the radial direction; the fixed rib part of the fixed ring component is embedded and fixed at the assembly subpart of the compensation fit part, and the support body part of the fixed ring component extends to the floating ring limiting subpart of the compensation fit part; the floating ring component is limited in the axial direction by the groove bottom of the floating ring limiting subpart of the compensation fit part and the support body part of the fixed ring component respectively; the floating ring component is limited in the radial direction by the side wall of the floating ring limiting subpart of the compensation fit part and the impeller water suction port of the rotor-impeller assembly respectively.

[0011] In the above technical scheme, the gap between the impeller water suction port of the rotor-impeller assembly and the inner ring of the floating ring component of the gap compensation assembly is d, and d < 0.1 mm; the thickness of the floating ring component is L, and L > 0.3 mm.

[0012] In the above technical scheme, a chamfer structure / round corner structure is arranged at the joint of the impeller fit subpart and the floating ring limiting subpart of the compensation fit part; and / or a chamfer structure / round corner structure is arranged at the joint of the floating ring limiting subpart and the assembly subpart of the compensation fit part.

[0013] In the above technical solution, the outer wall of the impeller water suction port of the rotor-impeller assembly and the inner ring of the floating ring member of the gap compensation assembly are both configured as cylindrical surfaces.

[0014] The electronic water pump further comprises a pump housing member, a stator assembly and a driving circuit board. The rotor chamber is formed in the pump housing member. The impeller chamber of the pump cover member is in communication with the rotor chamber of the pump housing member. The rotor-impeller assembly is supported in the impeller chamber of the pump cover member and the rotor chamber of the pump housing member, so that the rotor-impeller assembly can rotate in the impeller chamber and the rotor chamber. The stator assembly is arranged in the pump housing member and is radially aligned with the rotor-impeller assembly. The driving circuit board is arranged in the pump housing member and is electrically connected with the stator assembly.

[0015] In the above technical solution, the rotor-impeller assembly comprises a rotor support member, an impeller cover member, a permanent magnet member and a bearing member. The impeller water suction port is arranged at the impeller cover member. The rotor support member is provided with a blade platform portion and a permanent magnet-bearings mounting portion coaxially connected with the blade platform portion. The blade platform portion of the rotor support member is provided with a plurality of blades. The impeller cover member is fixed at the blade platform portion of the rotor support member to cover the blades. The permanent magnet member is coaxially sleeved at the permanent magnet-bearings mounting portion of the impeller support member. The bearing member is coaxially embedded in the permanent magnet-bearings mounting portion of the rotor support member.

[0016] In the above technical solution, the side surface of the impeller water suction port of the rotor-impeller assembly is provided with a wear-resistant ring. The side surface of the wear-resistant ring is flush with the side surface of the impeller water suction port.

[0017] The application discloses a water inlet method of an electronic water pump, which is applied to the electronic water pump; the electronic water pump comprises at least a pump cover component and a rotor-impeller assembly; an inner side of the pump cover component is formed with an impeller chamber, and the pump cover component is respectively formed with a water inlet and a water outlet which are communicated with two sides of the impeller chamber; at least a part of the rotor-impeller assembly can rotate in the impeller chamber of the pump cover component; the electronic water pump further comprises a gap compensation assembly; the gap compensation assembly at least comprises a floating ring component which is movably arranged in the water inlet of the pump cover component; the rotor-impeller assembly is at least arranged with an impeller water suction port which extends in an axial direction; the impeller water suction port of the rotor-impeller assembly is inserted into an inner ring of the floating ring component of the gap compensation assembly in a gap fit mode; the water inlet of the pump cover component is expanded on one side in the impeller chamber to form a compensation fit part; and the floating ring component is movably arranged in the compensation fit part of the water inlet in a mode suitable for circumferential rotation, axial translation and radial translation.

[0018] The method comprises the following steps: the rotor-impeller assembly rotates in the impeller chamber of the pump cover component to generate a high-pressure flow field in the impeller chamber of the pump cover component and a low-pressure flow field in the water inlet of the pump cover component; a pressure difference between the high-pressure flow field and the low-pressure flow field drives the floating ring component of the gap compensation assembly to make an end surface of the floating ring component tightly adhere to a groove bottom of the compensation fit part of the water inlet to close a gap between the compensation fit part of the water inlet and the impeller water suction port of the rotor-impeller assembly.

[0019] Compared with the prior art, the electronic water pump, the water inlet structure of the electronic water pump, and the water inlet method of the electronic water pump have the following beneficial effects: the floating ring component of the electronic water pump is movably arranged in the water inlet of the pump cover component, the impeller water suction port of the rotor-impeller assembly is inserted into the inner ring of the floating ring component of the gap compensation assembly in a gap fit mode, and when the rotor-impeller assembly rotates, a pressure difference between a high-pressure flow field and a low-pressure flow field makes an end surface of the floating ring component tightly adhere to a groove bottom of the compensation fit part of the water inlet to close a gap between the compensation fit part of the water inlet and the impeller water suction port of the rotor-impeller assembly; in this way, only a gap d (a micro gap) between the impeller water suction port of the rotor-impeller assembly and the inner ring of the floating ring component of the gap compensation assembly is left between the water inlet of the pump cover component and the impeller water suction port of the rotor-impeller assembly, and the backflow phenomenon of the electronic water pump can be obviously inhibited, so that the operation efficiency of the electronic water pump is improved; in addition, since the floating ring component is adopted, the dynamic friction between the moving part and the static part of the electronic water pump can be greatly reduced, and the mute performance, the operation stability and the service life of the electronic water pump are improved; in addition, the electronic water pump has the advantages of compact and reliable structure, simple assembly, high consistency and low manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the present application.

[0021] Figure 2 is an exploded view of the present application.

[0022] Figure 3 is a sectional view of the present application.

[0023] Figure 4 is Figure 3 is an enlarged view of part A in

[0024] Figure 5 is an assembly structure diagram of the pump cover member and the gap compensation assembly in the present application.

[0025] Figure 6 is one of the exploded views of the rotor-impeller assembly in the present application.

[0026] Figure 7 is a simulated cloud chart corresponding to the simulation data of serial number 25.

[0027] Figure 8 is a simulated cloud chart corresponding to the simulation data of serial number 1.

[0028] Figure 9 is the second exploded view of the rotor-impeller assembly in the present application.

[0029] Figure 10 is a structure diagram of the impeller water suction port in the present application.

[0030] The reference signs are as follows: 1, pump cover member; 11, impeller chamber; 12, water inlet; 13, water outlet; 14, shaft core support; 15, compensation matching part; 151, impeller matching subpart; 152, floating ring limiting subpart; 153, assembly subpart; 2, rotor-impeller assembly; 21, rotor support member; 211, blade platform part; 211a, blade; 212, permanent magnet-bearings mounting part; 213, secondary plastic body; 22, impeller cover member; 221, impeller water suction port; 221a, wear-resistant ring; 23, permanent magnet member; 24, bearing member; 3, gap compensation assembly; 31, floating ring member; 32, fixed ring member; 321, fixed rib part; 322, support body part; 4, pump shell member; 41, rotor chamber; 42, shaft core support; 5, stator assembly; 6, shaft core. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0032] The present embodiment provides a water inlet structure of an electronic water pump, which is applied to the electronic water pump.

[0033] Please refer to Figures 1-6 The electronic water pump at least includes a pump cover member 1 and a rotor-impeller assembly 2.

[0034] The pump cover member 1 is an integrally formed cover-shaped member made of engineering plastic material or metal material.

[0035] The pump cover member 1 is formed with an impeller chamber 11 on the inner side, and the pump cover member 1 is respectively formed with a water inlet 12 and a water outlet 13 which communicate between the inside and the outside of the impeller chamber 11. Specifically, the impeller chamber 11 is a cavity on the inner side of the pump cover member 1, and the water inlet 12 and the water outlet 13 are both integrally formed as short pipe-shaped structural features on the pump cover member 1.

[0036] At least a part of the rotor-impeller assembly 2 is capable of rotating in the impeller chamber 11 of the pump cover member 1.

[0037] In order to compensate for the gap between the pump cover member 1 and the rotor-impeller assembly 2, and to reduce the backflow phenomenon of the electronic water pump, the electronic water pump further comprises a gap compensation assembly 3.

[0038] The gap compensation assembly 3 at least includes a floating ring member 31, wherein the floating ring member 31 is a ring-shaped member made of polytetrafluoroethylene (PTFE), graphite, ceramic, special engineering plastic or composite material, which has the characteristics of self-lubrication, low roughness, high temperature resistance, low temperature resistance, hydrolysis resistance, etc.; the floating ring member 31 is movably arranged in the water inlet 12 of the pump cover member 1.

[0039] The rotor-impeller assembly 2 is at least provided with an impeller water suction port 221 extending in the axial direction. In fact, the impeller water suction port 221 is a ring structure at the top of the rotor-impeller assembly 2, which is used to suck liquid medium into the inside of the rotor-impeller assembly 2.

[0040] The impeller water suction port 221 of the rotor-impeller assembly 2 is inserted into the inner ring of the floating ring member 31 of the gap compensation assembly 3 in a clearance fit manner.

[0041] Specifically, the water inlet 12 of the pump cover member 1 is expanded on one side within the impeller chamber 11 to form a compensation fitting portion 15; the floating ring member 31 is movably arranged in the compensation fitting portion 15 of the water inlet 12 in a manner suitable for circumferential rotation, axial translation and radial translation.

[0042] Please refer to Figures 3-5 , further specifically, the gap compensation assembly 3 further comprises a fixed ring member 32, wherein the fixed ring member 32 is an annular member made of engineering plastic; the fixed ring member 32 comprises a fixed rib portion 321 and a support body portion 322 extending radially inward from the fixed rib portion 321, and the fixed rib portion 321 and the support body portion 322 are integrally formed; the compensation fitting portion 15 of the water inlet 12 is sequentially arranged from outside to inside in a radial direction as a stepped structure of an impeller fitting sub-portion 151, a floating ring limiting sub-portion 152 and an assembly sub-portion 153, specifically, the impeller fitting sub-portion 151, the floating ring limiting sub-portion 152 and the assembly sub-portion 153 are integrally formed on the inner side of the water inlet 12 of the pump cover member 1 to form the compensation fitting portion 15, and the entire compensation fitting portion 15 is in a stepped structure; the fixed rib portion 321 of the fixed ring member 32 is embedded and fixed at the assembly sub-portion 153 of the compensation fitting portion 15, specifically, the assembly sub-portion 153 of the compensation fitting portion 15 is formed with an annular embedding groove, and the fixed rib portion 321 of the fixed ring member 32 is embedded and fixed in the embedding groove, and the two can be fixed by interference fit, buckle fit or ultrasonic welding; the support body portion 322 of the fixed ring member 32 extends to the floating ring limiting sub-portion 152 of the compensation fitting portion 15; the floating ring member 31 is limited in the axial direction by the groove bottom of the floating ring limiting sub-portion 152 of the compensation fitting portion 15 and the support body portion 322 of the fixed ring member 32; the floating ring member 31 is limited in the radial direction by the side wall of the floating ring limiting sub-portion 152 of the compensation fitting portion 15 and the impeller water suction port 221 of the rotor-impeller assembly 2, in this way, the floating ring member 31 can be movably arranged in the compensation fitting portion 15 of the water inlet 12.

[0043] Please refer to Figure 4 , further, the gap between the impeller water suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 is d, then d < 0.1 mm; the thickness of the floating ring member 31 is L, then L > 0.3 mm.

[0044] Further, the joint between the impeller fitting sub 151 of the compensation fitting 15 and the floating ring limiting sub 152 is configured with a chamfer structure / round corner structure to avoid friction between the floating ring member 31 and the sharp right angle; and / or the joint between the floating ring limiting sub 152 of the compensation fitting 15 and the assembly sub 153 is configured with a chamfer structure / round corner structure to guide the floating ring member 31 when it is assembled into the floating ring limiting sub 152.

[0045] Further, the outer wall of the impeller water suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 are both configured as cylindrical surfaces (rather than conical surfaces); when one of the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 is a conical surface, or both are conical surfaces, the gap between the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 will change with the axial translation of the floating ring member 31, and eccentric wear between the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 is prone to occur; by configuring both the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 as cylindrical surfaces, on the one hand, the gap between the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 is maintained at a constant value, and on the other hand, eccentric wear between the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 is less likely to occur; in this way, a reasonable, effective, and more uniform micro-gap fit between the outer wall of the impeller water suction port 221 and the inner ring of the floating ring member 31 can be ensured, thereby more effectively reducing the backflow phenomenon of the electronic water pump.

[0046] The present embodiment also provides an electronic water pump comprising the above-mentioned water inlet structure of the electronic water pump.

[0047] The electronic water pump of the present embodiment further comprises a pump housing member 4, a stator assembly 5, and a drive circuit board (not shown in the figure).

[0048] The pump housing member 4 is an integrally formed engineering plastic or metal half-shell member that provides a structural support base for the electronic water pump of the present embodiment.

[0049] The stator assembly 5 includes a stator core and a stator winding obtained by winding an enameled wire around the tooth portion of the stator core in a predetermined number of turns; when the stator winding is energized, an alternating magnetic field is generated to drive the rotor-impeller assembly 2 to rotate.

[0050] The drive circuit board is a printed circuit board (PCB) that carries a main control, power electronic devices for driving the stator assembly 5 to operate, and necessary peripheral circuits for driving the stator assembly 5 to operate.

[0051] The pump shell member 4 is formed with a rotor chamber 41, which is actually a cavity structure integrally formed with the pump shell member 4.

[0052] The pump cover member 1 is coupled to the pump shell member 4, so that the impeller chamber 11 of the pump cover member 1 and the rotor chamber 41 of the pump shell member 4 are in communication with each other. It is understood that the pump cover member 1 and the pump shell member 4 can be fixed as a whole by means of screws or buckles, and a sealing ring is arranged at the joint of the two members to achieve sealing.

[0053] The rotor-impeller assembly 2 is supported in the impeller chamber 11 of the pump cover member 1 and the rotor chamber 41 of the pump shell member 4, so that the rotor-impeller assembly 2 can rotate in the impeller chamber 11 and the rotor chamber 41.

[0054] The stator assembly 5 is arranged in the pump shell member 4, and the stator assembly 5 and the rotor-impeller assembly 2 are radially aligned with each other.

[0055] The driving circuit board is arranged in the pump shell member 4 and electrically connected with the stator assembly 5. It is noted that the stator assembly 5 is provided with a terminal, the end of the stator winding of the stator assembly 5 is welded on the terminal, and the terminal is welded on the driving circuit board, so as to achieve the electrical connection between the driving circuit board and the stator assembly 5.

[0056] It is understood that the stator assembly 5 and the driving circuit board can be fixed in the pump shell member 4 by means of screws, buckles or interference fit.

[0057] Please especially refer to Figure 3 and Figure 6, specifically, the rotor-impeller assembly 2 comprises a rotor support member 21, an impeller cover member 22, a permanent magnet member 23, and a bearing member 24; wherein the rotor support member 21 is an integrally injection-molded support-shaped member made of engineering plastic material, for providing the rotor-impeller assembly 2 with an overall structural support base and a functional support base, the impeller cover member 22 is an integrally injection-molded cover-shaped member made of engineering plastic material, the permanent magnet member 23 is a magnetic metal ring body, capable of being coupled with the rotating magnetic field generated by the stator assembly 5 to drive the rotor-impeller assembly 2 to rotate; the bearing member 24 is one of a ceramic bearing, a graphite bearing, and a metal shaft sleeve, having self-lubricating performance; an impeller water suction port 221 is configured at the impeller cover member 22, actually, the impeller water suction port 221 is an annular structure feature integrally injection-molded at the center of the impeller cover member 22; the rotor support member 21 is configured with a blade platform portion 211, and a permanent magnet-bearings mounting portion 212 coaxially connected with the blade platform portion 211, the blade platform portion 211 is a circular platform-shaped structure feature, and the permanent magnet-bearings mounting portion 212 is a cylindrical structure feature, both of which are integrally injection-molded; the blade platform portion 211 of the rotor support member 21 is configured with a plurality of blades 211a, actually, the blades 211a are a plurality of arc-shaped sheet structure features integrally injection-molded at the blade platform portion 211, capable of driving liquid medium to flow when rotating; the impeller cover member 22 is fixed at the blade platform portion 211 of the rotor support member 21 (specifically, fixed by means of ultrasonic welding), to cover the blades 211a; the permanent magnet member 23 is coaxially sleeved at the permanent magnet-bearings mounting portion 212 of the impeller support member; the bearing member 24 is coaxially embedded in the permanent magnet-bearings mounting portion 212 of the impeller support member.

[0058] Further, the combination of the rotor support member 21 and the permanent magnet member 23 is subjected to secondary injection molding, to form a secondary plastic-coated body 213 coated on the surface of the permanent magnet member 23.

[0059] The rotor-impeller assembly 2 of the present embodiment is manufactured by first preparing the permanent magnet member 23 and the bearing member 24, then placing the permanent magnet member 23 and the bearing member 24 in a forming mold of the rotor support member 21, injecting plastic material into the forming mold, and demolding after the plastic material is cooled and solidified to obtain the combination of the rotor support member 21, the permanent magnet member 23, and the bearing member 24. Subsequently, the combination of the rotor support member 21, the permanent magnet member 23, and the bearing member 24 is placed in a forming mold of the secondary plastic covering 213, plastic material is injected into the forming mold, and demolding is performed after the plastic material is cooled and solidified to obtain the secondary plastic covering 213 covering the surface of the permanent magnet member 23. Finally, the impeller cover member 22 is fixedly welded to the blade platform portion 211 of the rotor support member 21 (specifically, the top surface of the blade 211a) using ultrasonic welding to cover the blade 211a, thereby completing the manufacturing process of the rotor-impeller assembly 2.

[0060] The use of the high-performance permanent magnet member 23 can effectively improve the electromagnetic efficiency between the stator assembly 5 and the rotor-impeller assembly 2, thereby improving the overall efficiency of the electronic water pump of the present embodiment applied to the liquid cooling heat dissipation system of the computing device and further obtaining good energy consumption control performance. However, the high-performance permanent magnet member 23 is prone to corrosion / electrolysis in the liquid cooling medium. Therefore, the secondary injection of the combination of the rotor support member 21 and the permanent magnet member 23 to form the secondary plastic covering 213 covering the surface of the permanent magnet member 23 can effectively prevent the permanent magnet member 23 from being corroded / electrolyzed.

[0061] Specifically, the electronic water pump of the present embodiment further includes a shaft core 6 which is a cylindrical metal shaft. The shaft core support 42 is formed in the rotor cavity 41 of the pump shell member 4 (the shaft core support 42 is integrally formed at the bottom of the rotor cavity 41), the shaft core support 14 is formed on the inner side of the water inlet 12 of the pump cover member 1 (the shaft core support 14 is integrally formed on the inner side of the pump cover member 1), and the shaft core support 42 of the pump shell member 4 and the shaft core support 14 of the pump cover member 1 are in mutual position. The shaft core 6 is supported at least in part on the shaft core support 42 of the pump shell member 4 and at least in part on the shaft core support 14 of the pump cover member 1. In the present embodiment, the two ends of the shaft core 6 are respectively inserted and fixed in the shaft core support 42 of the pump shell member 4 and the shaft core support 14 of the pump cover member 1, and the shaft core 6 is fixed in the circumferential direction by means of special-shaped fitting. The rotor-impeller assembly 2 is sleeved on the shaft core 6, and the rotor-impeller assembly 2 is adapted to rotate about the shaft core 6. In the present embodiment, the bearing member 24 of the rotor-impeller assembly 2 is sleeved on the shaft core 6, so that the rotor-impeller assembly 2 is adapted to rotate about the shaft core 6.

[0062] The electronic water pump of the embodiment is connected to the driving circuit board by an external power source in use, the driving circuit board supplies power to the stator winding of the stator assembly 5, the stator winding generates an alternating magnetic field after being powered, the alternating magnetic field generates a rotating magnetic field in the rotor chamber 41 through the guidance of the stator core, the rotating magnetic field is located in the rotor chamber 41 in space; the rotor-impeller assembly 2 in the rotor chamber 41 is magnetically coupled with the rotating magnetic field through the permanent magnet member 23, so that the entire rotor-impeller assembly 2 starts to rotate; when the impeller body member in the impeller chamber 11 rotates, a directional pressure difference is generated in the impeller chamber 11, so as to drive the liquid medium to be sucked into the impeller chamber 11 from the water inlet 12 and discharged from the water outlet 13, thereby completing the function of the water pump.

[0063] Please refer to Figure 9 and Figure 10 The side surface of the impeller water suction port 221 of the rotor-impeller assembly 2 is provided with a wear-resistant ring 221a, and the side surface of the wear-resistant ring 221a is flush with the side surface of the impeller water suction port 221; specifically, the wear-resistant ring 221a is one of metal, ceramic and graphite materials, and has high smoothness and wear resistance on the surface. The wear-resistant ring 221a is placed in a forming mold of the impeller cover member 22, plastic material is injected into the forming mold, and after the plastic material is cooled and solidified, the forming mold is demolded, thereby obtaining the combination of the impeller cover member 22 and the wear-resistant ring 221a. The wear-resistant ring 221a is arranged on the side surface of the impeller water suction port 221, and cooperates (especially frictionally cooperates) with the floating ring member 31, so as to prevent the impeller water suction port 221 of the rotor-impeller assembly 2 from being damaged by friction.

[0064] The embodiment also provides a water inlet method of an electronic water pump, which is applied to the electronic water pump.

[0065] The method comprises the following steps.

[0066] The rotor-impeller assembly 2 rotates in the impeller chamber 11 of the pump cover member 1, so that a high-pressure flow field is generated in the impeller chamber 11 of the pump cover member 1, and a low-pressure flow field is generated in the water inlet 12 of the pump cover member 1.

[0067] The pressure difference between the high-pressure flow field and the low-pressure flow field pushes the floating ring member 31 of the gap compensation assembly 3, so that the end surface of the floating ring member 31 is tightly attached to the groove bottom of the compensation cooperation part 15 (specifically, the groove bottom of the floating ring limiting sub-portion 152) of the water inlet 12, so as to close the gap between the compensation cooperation part 15 of the water inlet 12 and the impeller water suction port 221 of the rotor-impeller assembly 2.

[0068] The gap between the compensation fitting part 15 of the water inlet 12 and the impeller suction port 221 of the rotor-impeller assembly 2 can be considered as being completely filled by the floating ring member 31 (i.e. can be considered as having no gap), the gap d between the impeller suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 is a small gap, the flow of fluid medium at this place is extremely low, which can provide water lubrication performance between the impeller suction port 221 and the floating ring member 31 while reducing the backflow phenomenon.

[0069] It can be understood that when the pressure difference between the high-pressure flow field and the low-pressure flow field is sufficient, the end face of the floating ring member 31 will always adhere to the groove bottom of the compensation fitting part 15 of the water inlet 12, at this time, the fixed ring member 32 of the gap compensation assembly 3 is an optional configuration.

[0070] The water inlet structure of the electronic water pump, the electronic water pump and the water inlet method applied to the electronic water pump of the embodiment are simulated by computer software for computational fluid dynamics (CFD), the process and the simulation results are as follows:

[0071] The initial setting parameters of the computational fluid dynamics simulation are as follows:

[0072] 1. The gap a (as shown in FIG. 1) between the outer ring of the floating ring member 31 and the side wall of the floating ring limiting part 152 of the compensation fitting part 15 is set to 0.6 mm; Figure 4

[0073] 2. The gap b (as shown in FIG. 1) between the end face of the impeller suction port 221 of the rotor-impeller assembly 2 and the groove bottom of the impeller fitting part 151 of the compensation fitting part 15 is set to 0.4 mm; Figure 4

[0074] 3. The pressure of the high-pressure flow field in the impeller chamber 11 of the pump cover member 1 is set to 200 kPa+1 atm;

[0075] 4. The pressure of the low-pressure flow field in the water inlet 12 of the pump cover member 1 is set to 1 atm.

[0076] The independent variable parameters of the computational fluid dynamics simulation are as follows:

[0077] 1. The gap d (unit: mm, as shown in FIG. 1) between the impeller suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3; Figure 4

[0078] 2. The thickness L (unit: mm, as shown in FIG. 1) of the floating ring member 31. Figure 4

[0079] ​​​​The dependent variable parameters of the computational fluid dynamics simulation are:

[0080] 1. The leakage flow rate (unit: L / min) of the fluid medium at the water inlet 12 of the pump cover member 1 when the electronic water pump has a backflow phenomenon;

[0081] 2. The leakage blocking rate (%) of the floating ring member 31 to the backflow phenomenon.

[0082] The simulation results are shown in the following table (Table 1):

[0083]

[0084] Table 1 Computational fluid dynamics simulation results

[0085] The simulation data of No. 25 shows that the leakage blocking rate of the floating ring member 31 to the backflow phenomenon is 0%, i.e., this set of data can be regarded as the electronic water pump without the floating ring member 31; Figure 7 is the simulation cloud map corresponding to the simulation data of No. 25, which shows the leakage flow rate (unit: L / min) of the liquid medium at the cross section of the pump cover member 1; from the simulation data of No. 25 combined with Figure 7 It can be known that when the electronic water pump does not have the floating ring member 31, if a backflow phenomenon occurs, the leakage flow rate of the fluid medium at the water inlet 12 of the pump cover member 1 can be as high as 12.98 L / min.

[0086] The simulation data of No. 1 shows that the leakage blocking rate of the floating ring member 31 to the backflow phenomenon is 99.6%; Figure 8 is the simulation cloud map corresponding to the simulation data of No. 1, which shows the leakage flow rate (unit: L / min) of the liquid medium at the cross section of the pump cover member 1; from the simulation data of No. 1 combined with Figure 8 It can be known that when the electronic water pump is configured with the floating ring member 31 with a thickness L of 1.5 mm, and the gap d between the impeller water suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 is 0.01 mm, if a backflow phenomenon occurs, the leakage flow rate of the fluid medium at the water inlet 12 of the pump cover member 1 is only 0.05 L / min at most, the leakage blocking rate of the floating ring member 31 to the backflow phenomenon is 99.6%, and the backflow phenomenon of the electronic water pump can be greatly reduced.

[0087] Even if the gap d between the impeller water suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 is 0.1 mm, the leakage flow of the fluid medium at the water inlet 12 of the pump cover member 1 can still be limited to 3.34 L / min or less, the leakage blocking rate for the backflow phenomenon is 74.3% or more, and the backflow phenomenon of the electronic water pump can still be substantially inhibited.

[0088] The water inlet structure of the electronic water pump, the electronic water pump, and the water inlet method applied to the electronic water pump of the present embodiment, the floating ring member 31 is movably arranged in the water inlet 12 of the pump cover member 1, the impeller water suction port 221 of the rotor-impeller assembly 2 is inserted into the inner ring of the floating ring member 31 of the gap compensation assembly 3 in a clearance fit manner, when the rotor-impeller assembly 2 rotates, the pressure difference between the high-pressure flow field and the low-pressure flow field makes the end surface of the floating ring member 31 tightly abut the groove bottom of the compensation fit part 15 of the water inlet 12 to close the gap between the compensation fit part 15 of the water inlet 12 and the impeller water suction port 221 of the rotor-impeller assembly 2; in this way, only the gap d (which belongs to a micro gap) between the impeller water suction port 221 of the rotor-impeller assembly 2 and the inner ring of the floating ring member 31 of the gap compensation assembly 3 is left between the water inlet 12 of the pump cover member 1 and the impeller water suction port 221 of the rotor-impeller assembly 2, the backflow phenomenon of the electronic water pump can be substantially inhibited, thereby improving the operating efficiency of the electronic water pump, in addition, since the floating ring member 31 is adopted, the dynamic friction between the moving parts and the stationary parts of the electronic water pump can be greatly reduced, the mute performance, the operating stability and the service life of the electronic water pump are improved; in addition, the electronic water pump of the present embodiment has the advantages of compact and reliable structure, simple assembly, high consistency and low manufacturing cost.

[0089] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A water inlet structure for an electronic water pump, used in an electronic water pump; The electronic water pump includes at least a pump cover component and a rotor-impeller assembly; An impeller chamber is formed on the inner side of the pump cover component, and an inlet and an outlet are respectively formed on the pump cover component to connect the inner and outer sides of the impeller chamber. At least a portion of the rotor-impeller assembly is rotatable within the impeller chamber of the pump cover member; Its features are, The electronic water pump also includes a gap compensation component; The gap compensation assembly includes at least a floating ring member, which is movably disposed in the inlet of the pump cover member; The rotor-impeller assembly is provided with at least one impeller suction port extending in the axial direction; The impeller inlet of the rotor-impeller assembly is inserted into the inner ring of the floating ring component of the gap compensation assembly in a clearance fit manner.

2. The water inlet structure of the electronic water pump according to claim 1, characterized in that, The water inlet of the pump cover component expands on one side of the impeller chamber to form a compensating fit. The floating ring component is movably configured within the compensating fitting of the inlet in a manner suitable for circumferential rotation, axial translation, and radial translation.

3. The water inlet structure of the electronic water pump according to claim 2, characterized in that, The gap compensation assembly also includes a fixing ring component; The fixing ring member includes a fixing rib and a support portion extending radially inward from the fixing rib. The compensation fitting part of the water inlet is arranged in the radial direction from the outside to the inside as an impeller fitting sub-part, a floating ring limiting sub-part, and an assembly sub-part with a stepped structure. The fixing rib of the fixing ring member is embedded and fixed at the assembly sub-part of the compensation mating part, and the support body of the fixing ring member extends to the floating ring limiting sub-part of the compensation mating part. The floating ring component is limited in the axial direction by the bottom of the groove of the floating ring limiting sub-part of the compensation fitting part and the support part of the fixed ring component; The floating ring component is limited in the radial direction by the side wall of the floating ring limiting sub-part of the compensation mating part and the impeller suction port of the rotor-impeller assembly, respectively.

4. The water inlet structure of the electronic water pump according to any one of claims 1-3, characterized in that, If the gap between the impeller suction port of the rotor-impeller assembly and the inner ring of the floating ring component of the gap compensation assembly is d, then: d < 0.1 mm; If the thickness of the floating ring component is L, then: L > 0.3 mm.

5. The water inlet structure of the electronic water pump according to claim 3, characterized in that, The connection between the impeller fitting sub-part of the compensation fitting part and the floating ring limiting sub-part is provided with a chamfered / rounded corner structure. And / or, the connection between the floating ring limiting sub-part and the assembly sub-part of the compensation mating part is provided with a chamfered structure / rounded corner structure.

6. The water inlet structure of the electronic water pump according to any one of claims 1-3, characterized in that, The outer wall of the impeller inlet of the rotor-impeller assembly, and the inner ring of the floating ring member of the gap compensation assembly, are both configured as cylindrical surfaces.

7. An electronic water pump, characterized in that, Includes the water inlet structure of the electronic water pump according to any one of claims 1-6; It also includes pump housing components, stator assembly, and drive circuit board; A rotor chamber is formed within the pump casing component; The pump cover component covers the pump casing component, so that the impeller chamber of the pump cover component is in communication with the rotor chamber of the pump casing component; The rotor-impeller assembly is supported in the impeller chamber of the pump cover member and the rotor chamber of the pump casing member, so that the rotor-impeller assembly can rotate in the impeller chamber and the rotor chamber; The stator assembly is disposed within the pump casing member, and the stator assembly and the rotor-impeller assembly are aligned with each other in the radial direction; The drive circuit board is disposed within the pump housing component and is electrically connected to the stator assembly.

8. The electronic water pump according to claim 7, characterized in that, The rotor-impeller assembly includes a rotor support component, an impeller cover component, a permanent magnet component, and a bearing component; The impeller suction port is located on the impeller cover component; The rotor support component is provided with a blade platform portion and a permanent magnet-bearing mounting portion coaxially connected to the blade platform portion; The rotor support component has a blade platform portion equipped with several blades. The impeller cover component is fixed at the blade platform portion of the rotor support component to cover the blade; The permanent magnet component is coaxially fitted onto the permanent magnet-bearing mounting portion of the impeller support component; The bearing component is coaxially embedded in the permanent magnet-bearing mounting portion of the rotor support component.

9. The electronic water pump according to claim 8, characterized in that, The impeller suction port side surface of the rotor-impeller assembly is provided with a wear-resistant ring; The side surface of the wear-resistant ring is flush with the side surface of the impeller inlet.

10. A water inlet method for an electronic water pump, applied at the electronic water pump; characterized in that, The electronic water pump includes at least a pump cover component and a rotor-impeller assembly; An impeller chamber is formed on the inner side of the pump cover component, and an inlet and an outlet are respectively formed on the pump cover component to connect the inner and outer sides of the impeller chamber. At least a portion of the rotor-impeller assembly is rotatable within the impeller chamber of the pump cover member; The electronic water pump also includes a gap compensation component; The gap compensation assembly includes at least a floating ring member, which is movably disposed in the inlet of the pump cover member; The rotor-impeller assembly is provided with at least one impeller suction port extending in the axial direction; The impeller inlet of the rotor-impeller assembly is inserted into the inner ring of the floating ring component of the gap compensation assembly in a clearance fit manner. The water inlet of the pump cover component expands on one side of the impeller chamber to form a compensating fit. The floating ring component is movably configured in the compensating fitting part of the inlet in a manner suitable for circumferential rotation, axial translation and radial translation; The method includes: The rotor-impeller assembly rotates within the impeller chamber of the pump cover component, generating a high-pressure flow field within the impeller chamber of the pump cover component and a low-pressure flow field within the inlet of the pump cover component. The pressure difference between the high-pressure flow field and the low-pressure flow field pushes the floating ring component of the gap compensation assembly, so that the end face of the floating ring component is in close contact with the bottom of the groove of the compensation fitting part of the water inlet, thereby sealing the gap between the compensation fitting part of the water inlet and the impeller suction port of the rotor-impeller assembly.

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