AU2020348637A1

AU2020348637A1 - High-efficiency and low-noise automobile electronic water pump

Info

Publication number: AU2020348637A1
Application number: AU2020348637A
Authority: AU
Inventors: Ruijia CAO; Rong LU; Chunhao SHEN; Qiaorui SI; Jianping Yuan; Shouqi Yuan
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2019-09-19
Filing date: 2020-07-28
Publication date: 2021-08-19
Also published as: WO2021052013A1; CN110566470A

Abstract

Provided is a high-efficiency, low-noise automobile electronic water pump, relating to the technical field of automotive cooling systems, and comprising: a volute (6), an impeller (2), a main shaft (13), a rear pump body (9), a motor, a controller (24), and a sealed end cover (23); the controller (24) is electrically connected to the motor; a plurality of first through-holes (12) are provided on a front support plate of the rear pump body (9); a shaft through-hole (22) is provided in the axial direction inside the main shaft (13); a plurality of second through-holes (17) are provided on a back end cover (16); some of a high-pressure liquid at the outlet of the impeller in the volute (6) flows back through the first through-holes (12), the second through-holes (17), the shaft through-hole (22), and a return flow hole (4) on the impeller (2) in sequence to an impeller inlet; the inlet of the impeller (2) is provided with a belly-shaped flow channel, and a separating tongue (26) is obliquely arranged in the volute (6). The electronic water pump can achieve smart speed regulation according to cooling needs, facilitating the improvement of operating efficiency and cooling effectiveness, and reducing noise and facilitating disassembly.

Description

HIGH-EFFICIENCY, LOW-NOISE AUTOMOBILE ELECTRIC WATER PUMP TECHNICAL FIELD

[01] The present disclosure relates to the technical field of automobile cooling systems, and in particular, to a high-efficiency and low-noise automobile electric water pump.

BACKGROUNDART

[02] At present, a conventional automobile mechanical water pump uses an external engine as a power source, and uses a belt pulley, a gear, and the like as power transmission mediums to transmit power to a main shaft of a pump head. Under an action of an impeller, a volute, and other components, a coolant is pushed to circulate in an engine cooling circuit, with a flow rate determined by an engine speed.

[03] However, with the development of automobiles to intelligence, environmental protection and energy saving, the following shortcomings of existing structures are gradually highlighted. Because in the conventional automobile water pump, the pump head is driven mainly by the engine under an action of the belt pulley, a rotational speed of the impeller in the pump head will change proportionally with a change of the engine speed. On the one hand, the existing water pumps can meet requirements of cooling the engine only when the engine operates at a medium speed with a moderate load. However, the operation of the engine at a high speed with a heavy load may easily make the driven impeller rotate too fast, so that a pressure at an inlet side of the impeller is too low, which leads to cavitation and large noise and vibration; and the operation of the engine at a low speed with a heavy load may easily cause the quantity of pumped cooling water to be insufficient due to the too slow rotating speed of the driven impeller, which is hard to meet cooling requirements. On the other hand, because the existing automobile water pumps do not have separate power sources, and is integrated in the engine, it is difficult to disassemble and assemble the automobile water pump. When a cooling system fails, it often needs to be disassembled and overhauled together with the engine, which is very inconvenient. Moreover, in a process of maintenance and assembly, the mechanical seal is easily damaged due to an improper operation, resulting in outflow of the coolant and damage to a whole cooling system. An automobile electric water pump can overcome the shortcomings of the mechanical water pumps, and a flow rate of the water pump is changed by controlling the motor speed regulation by a controller, so as to meet requirements of the cooling system, which has been gradually popularized and applied. However, due to a high rotating speed and a limitation of structural space, there are problems such as low efficiency, high noise, a burning loss of the controller occurring easily, and the like.

SUMMARY

[04] The embodiments aim to provide a high-efficiency and low-noise automobile electric water pump to solve the above-mentioned problems in the prior art, which can achieve autonomous speed regulation, is beneficial to improve the operating efficiency and cooling effecttiveness of the automobile electric water pump, improves cavitation performance, reduces nose and is easy to disassemble and assemble.

[05] To achieve the foregoing object, the present disclosure provides the following solutions.

[06] The present disclosure provides a high-efficiency and low-noise automobile electric water pump, which includes a volute, an impeller, a main shaft, a rear pump body, a motor, a controller, a sealing end cover, and a controller end cover, wherein a rear end face of the volute is hermetically connected to a front end face of the rear pump body, the impeller is arranged in the volute and fixedly connected to the main shaft, a front of the main shaft passes through a front of the rear pump body, a rear of the main shaft passes through a rear end cover, the rear pump body internally has a cavity, a rotor of the motor is fixedly sleeved on the main shaft, a stator of the motor is fixedly arranged in the rear pump body, the controller is fixedly arranged on an outer side wall of the sealing end cover and is connected to the motor via a wire, the sealing end cover is hermetically connected to a rear end face of the rear pump body and the rear end cover by screws, and the controller end cover is arranged outside the sealing end cover; a front support plate of the rear pump body is provided with a plurality of first through holes, the main shaft is internally provided with a shaft through hole in an axial direction, the rear end cover is provided with a plurality of second through holes, and a part of a high-pressure liquid at an outlet of the impeller in the volute flows back to an inlet of the impeller sequentially through the first through holes, the second through holes, the shaft through hole and return holes in the impeller.

[07] In some embodiments, the high-efficiency and low-noise automobile electric water pump may further include a front opening ring which is arranged at the inlet of the impeller, and may have a length that is 1/15 of a diameter of the impeller.

[08] In some embodiments, the impeller may include a front cover plate, twisted blades, and a rear cover plate, the rear cover plate is fixedly sleeved on the main shaft and integrally manufactured with the twisted blades and the front cover plate, and the rear cover plate is arranged in a multi-arc way at a turning from the axial direction to a radial direction.

[09] In some embodiments, a multiple the return holes may be provided in the rear cover plate close to an inlet of the blade.

[10] In some embodiments, an inlet section of the impeller may be provided with a belly-shaped flow channel, and the belly-shaped flow channel may have a cross-sectional area that is 10% greater than that of the inlet of the impeller.

[11] In some embodiments, a volute tongue may be obliquely arranged in the volute.

[12] In some embodiments, the volute tongue in the volute may protrude outward at an angle of 15° relative to a setup position of a conventional volute tongue.

[13] In some embodiments, the high-efficiency and low-noise automobile electric water pump further may include an inlet pipe quick connector and an outlet pipe quick connector, where one end of the inlet pipe quick connector may be communicated with the inlet of the impeller, one end of the outlet pipe quick connector may be communicated with a volute outlet, and the outlet pipe quick connector mey be obliquely arranged.

[14] In some embodiments, the high-efficiency and low-noise automobile electric water pump further may include a front thrust disc, a front guide bearing, a rear thrust disc, and a rear guide bearing, where the front thrust disc may be sleeved at the front of the main shaft and may be in clearance fit with the front guide bearing, and the rear thrust disc may be sleeved at the rear of the main shaft and may be in clearance fit with the rear guide bearing.

[15] Compared with the prior art, the embodiments have the following technical effects.

[16] A high-efficiency and low-noise automobile electric water pump is provided. Through the connection between the controller and the motor, the rotating speed of the motor rotor is adjusted timely, and the rotating speed of the impeller can be prevented from changing with the speed of the automobile engine. The automobile electric water pump is independent of the automobile engine, thereby facilitating disassembly and overhaul. A design of a circulation cooling circuit in the motor can achieve the effects of improving anti-cavitation performance and good heat dissipation.

BRIEF DESCRIPTION OF THE DRAWINGS

[17] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.

[18] FIG. 1 is a cross-sectional view of a high-efficiency and low-noise automobile electric water pump according to the present disclosure;

[19] FIG. 2 is an outline diagram of a volute of the high-efficiency and low-noise automobile electric water pump according to the present disclosure;

[20] FIG. 3 is a radial cross-sectional view of an impeller of the high-efficiency and low-noise automobile electric water pump according to the present disclosure; and

[21] FIG. 4 is an internal structure diagram of the volute of the high-efficiency and low-noise automobile electric water pump according to the present disclosure.

[22] List of the reference characters: 1 inlet pipe quick connector; 2 impeller; 3 front opening ring; 4 return hole; 5 outlet pipe quick connector; 6 volute; 7 front pump body fastening screw; 8 sealing ring; 9 rear pump body; 10 front thrust disc; 11 front guide bearing; 12 first through hole; 13 main shaft; 14 stator; 15 rotor; 16 rear end cover; 17 second through hole; 18 rear end cover fastening screw; 19 rear guide bearing; 20 rear thrust disc; 21 through hole locking nut; 22 shaft through hole; 23 sealing end cover; 24 controller; 25 controller end cover; 26 volute tongue; and 27 setup position of a conventional volute tongue.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[23] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[24] The embodiments aim to provide a high-efficiency and low-noise automobile electric water pump to solve the problems existing in the prior art, which can achieve intelligent speed regulation, is beneficial to improve the operation efficiency and cooling effect of the automobile electric water pump, reduces operation noise and facilitates disassembly and assembly.

[25] To make the above objects, features and advantages of the present disclosure more obvious and easier to understand, the present disclosure will be further explained in detail below with reference to the accompanying drawings and specific implementations.

[26] As shown in FIGs. 1-4, this embodiment provides a high-efficiency and low-noise automobile electric water pump, including a volute 6, an impeller 2, a main shaft 13, a rear pump body 9, a motor, a controller 24, a sealing end cover 23, and a controller end cover 25. A rear end face of the volute 6 is hermetically connected to a front end face of the rear pump body 9 by front pump body fastening screws 7 and a sealing ring 8. The volute 6 is directly mounted on the rear pump body 9, thus shortening a wheelbase of the whole machine, saving space, energy and materials and making the structure compact. The impeller 2 is arranged in the volute 6 and fixedly connected to the main shaft 13. A front of the main shaft 13 passes through a front of rear pump body 9, and a rear of the main shaft 13 passes through a rear end cover 16. The rear pump body 9 internally has a cavity. A rotor 15 of the motor is fixedly arranged on the main shaft 13. A stator 14 of the motor is plastically sealed and fixedly arranged inside the rear pump body 9. The controller 24 is fixedly arranged on an outer side wall of the sealing end cover 23. The controller 24 is electrically connected to the motor and configured to control the motor to be on or off and a rotating speed of the motor. The controller 24 can control a rotating speed of the impeller 2 independently of the automobile engine, so that the rotating speed of the impeller 2 cannot change with the automobile engine speed. A closed impeller centrifugal pump has high efficiency, thereby achieving an effect of energy saving. The rear end cover 16 and the sealing end cover 23 are connected to the rear end face of the rear pump body 9 through rear end cover fastening screws 18, and the controller end cover 25 is arranged outside the sealing end cover 23.

[27] The front of the rear pump body 9 is provided with a plurality of first through holes 12, the main shaft 13 is internally provided with a shaft through hole 22 in an axial direction, and the rear end cover 16 is provided with a plurality of second through holes 17. A part of a liquid at an outlet of the impeller 2 in the volute 6 flows back to an inlet of the impeller 2 sequentially through the first through holes 12, the second through holes 17, the shaft through hole 22 and return holes 4 in the impeller 2, to implement circular flow. Most of fluid delivered by the impeller 2 is directly delivered to the exterior under an action of a centrifugal force, and a small amount of fluid flows through a gap between the impeller 2 and the rear pump body 9 and flows into a cavity with the rotor 15 through the first through holes 12 so as to cool the motor rotor 15, and then flows out through the second through holes 17 in the rear end cover 16. The fluid flows into a suction port of the impeller 2 through the shaft through hole 22 in the main shaft 13 and the return holes of the impeller 2 again, so as to balance an axial force and improve a cavitation resistance of the impeller 2.

[28] In addition, the motor is in a DC permanent magnet brushless motor drive mode, which aims to reduce an interference of signals from pump set to an automobile control system, especially electromagnetic conduction interference and electromagnetic radiation interference. Besides, a permanent magnet motor has higher efficiency and can achieve the effect of energy saving.

[29] The high-efficiency and low-noise automobile electric water pump further includes a front opening ring 3 arranged at the inlet of the impeller 2. The front opening ring 3 has a length that is 1/15 of the diameter of the impeller 2. Such an arrangement can reduce a volume leakage loss of the pump, thereby improving the efficiency of the pump.

[30] The impeller 2 is a closed structure, including a front cover plate, twisted blades, and a rear cover plate, all of which are integrally manufactured. The rear cover plate is fixedly sleeved on the main shaft 13 and is arranged in a multi-arc way at a turning from the axial direction to a radial direction. A radial inner end face is preferably arranged at an inclination angle of 5°. Such an arrangement enlarges an inlet width without changing an outline dimensions of the impeller 2, which is beneficial to expand a volume of a flow channel at the inlet of the impeller 2, further reducing a flow velocity of the liquid entering the flow channel at a front end of the impeller 2, and further ensuring that cavitation does not easily occur at the inlet of the impeller 2.

[31] A plurality of the return holes 4 are provided in the rear cover plate close to an inlet of the blade. When there are an even number of blades, a number of the return holes 4 is a half that of the blades, and when there are an odd number of blades, the number of the return holes 4 is a half that of the blades minus one. An incident angle of the return holes 4 is design to ensure that along the return holes 4, high-pressure water at the rear of the rear cover plate can be directly injected into a front ends of the blades through the first through holes 12, the second through holes 17, the shaft through hole 22 and the return holes 4, which is beneficial to increase a pressure at the inlet of the impeller 2, thereby improving a cavitation resistance of the impeller 2 and balancing the axial force of the impeller 2.

[32] The inlet of the impeller 2 is provided with a belly-shaped flow channel, and the belly-shaped flow channel has a cross-sectional area that is 10% greater than that of the inlet of the impeller 2, which is beneficial to enlarge the volume of the flow channel at the inlet of the impeller 2, thereby reducing the flow velocity of the liquid entering the flow channel at the front end of the impeller 2 and increasing the pressure at the inlet of the impeller 2.

[33] An outlet of the volute 6 is arranged on a side wall of the volute 6. Compared with a setup position 27 of a conventional volute tongue, a volute tongue 26 in the volute 6 of the present disclosure is obliquely arranged and protrudes outward at an angle of 15°. Such an arrangement is beneficial to reduce impulsive noise generated by the impeller 2 sweeping the volute tongue 26 without lowering a lift head.

[34] The high-efficiency and low-noise automobile electric water pump further includes an inlet pipe quick connector 1 and an outlet pipe quick connector 5.One end of the inlet pipe quick connector 1 is communicated with the inlet of the impeller 2, one end of the outlet pipe quick connector 5 is communicated with an outlet of the volute 6, and the outlet pipe quick connector 6 is obliquely arranged. The inlet pipe quick connector 1 and the outlet pipe quick connector 5 are designed as a whole with the volute 6. Such an arrangement facilitates a connection of the high-efficiency and low-noise automobile electric water pump to a pipeline.

[35] The high-efficiency and low-noise automobile electric water pump further includes a front thrust disc 10, a front guide bearing 11, a rear guide bearing 19, and a rear thrust disc 20. The front guide bearing 11 is sleeved at the front of the main shaft 13, the front thrust disc 10 is in clearance fit with the front guide bearing 11, the impeller 2 is arranged in front of the front thrust disc 10, the rear guide bearing 19 is sleeved at the rear of the main shaft 13, the rear thrust disc 20 is in clearance fit with the rear guide bearing 19, and a through hole lock nut 21 is threadedly connected to the rear of the main shaft 13 to achieve the axial and radial positioning of a whole rotor system.

[36] Specific examples are applied in the present specification to explain the principle and embodiments of the present disclosure. The description of the foregoing embodiments is only used for helping understand the method and the core idea of the present disclosure. In addition, for a person of ordinary skill in the art, the specific embodiments and application scope may be change in accordance with the idea of the present disclosure. In conclusion, the content of the present specification shall not be construed as a limitation to the present disclosure.

Claims

WHAT IS CLAIMED IS:

1. A high-efficiency and low-noise automobile electric water pump, comprising a volute, an impeller, a main shaft, a rear pump body, a motor, a controller, a sealing end cover, and a controller end cover, wherein a rear end face of the volute is hermetically connected to a front end face of the rear pump body, the impeller is arranged in the volute and fixedly connected to the main shaft, a front of the main shaft passes through a front of the rear pump body, a rear of the main shaft passes through a rear end cover, the rear pump body internally has a cavity, a rotor of the motor is fixedly sleeved on the main shaft, a stator of the motor is fixedly arranged in the rear pump body, the controller is fixedly arranged on an outer side wall of the sealing end cover and is connected to the motor via a wire, the sealing end cover is hermetically connected to a rear end face of the rear pump body and the rear end cover by screws, and the controller end cover is arranged outside the sealing end cover; a front support plate of the rear pump body is provided with a plurality of first through holes, the main shaft is internally provided with a shaft through hole in an axial direction, the rear end cover is provided with a plurality of second through holes, and a part of a high-pressure liquid at an outlet of the impeller in the volute flows back to an inlet of the impeller sequentially through the first through holes, the second through holes, the shaft through hole and return holes in the impeller.

2. The high-efficiency and low-noise automobile electric water pump according to claim 1, further comprising a front opening ring, which is arranged at the inlet of the impeller, and has a length that is 1/15 of a diameter of the impeller.

3. The high-efficiency and low-noise automobile electric water pump according to claim 1, wherein the impeller comprises a front cover plate, twisted blades, and a rear cover plate, the rear cover plate is fixedly sleeved on the main shaft and integrally manufactured with the twisted blades and the front cover plate, and the rear cover plate is arranged in a multi-arc way at a turning from the axial direction to a radial direction.

4. The high-efficiency and low-noise automobile electric water pump according to claim 3, wherein a plurality of the return holes are provided in the rear cover plate close to an inlet of the blade.

5. The high-efficiency and low-noise automobile electric water pump according to claim 1, wherein an inlet section of the impeller is provided with a belly-shaped flow channel, and the belly-shaped flow channel has a cross-sectional area that is 10% greater than that of the inlet of the impeller.

6. The high-efficiency and low-noise automobile electric water pump according to claim 1, wherein a volute tongue is obliquely arranged in the volute.

7. The high-efficiency and low-noise automobile electric water pump according to claim 6, wherein the volute tongue in the volute protrudes outward at an angle of 15° relative to a setup position of a conventional volute tongue.

8. The high-efficiency and low-noise automobile electric water pump according to claim 1, further comprising an inlet pipe quick connector and an outlet pipe quick connector, wherein one end of the inlet pipe quick connector is communicated with the inlet of the impeller, one end of the outlet pipe quick connector is communicated with an outlet of the volute, and the outlet pipe quick connector is obliquely arranged.

9. The high-efficiency and low-noise automobile electric water pump according to claim 1, further comprising a front thrust disc, a front guide bearing, a rear thrust disc, and a rear guide bearing, wherein the front thrust disc is sleeved at the front of the main shaft and is in clearance fit with the front guide bearing, and the rear thrust disc is sleeved at the rear of the main shaft and is in clearance fit with the rear guide bearing.