Double-suction electronic water pump

Abstract

The invention relates to a double-suction electronic water pump which comprises a pump body, a double-suction impeller, a front pump cover, a rear pump cover, a first bearing bush, a motor shell, a first thrust disc seat, a first thrust disc, a bearing seat, a control panel, a breather valve, a rear cover, a second bearing bush, a motor rotor, a shielding sleeve, a motor stator, a hollow shaft, a third bearing bush, a water return pipe, a front end cover, a second thrust disc seat and a second thrust disc. Gaps are formed between the outer circle of the hollow shaft and the inner circles of the first bearing bush, the second bearing bush and the third bearing bush, a rear pump cover overflowing hole is formed in the rear pump cover, and a bearing seat overflowing groove is formed in the bearing seat making contact with the second bearing bush. According to the invention, a battery heat dissipation working condition under a high-flow condition is ensured, and the cavitation allowance of a product is effectively reduced. The application problem that the double-suction impeller is introduced into the electronic water pump is solved, the problems that the electronic water pump is low in large-flow efficiency, prone to stall and high in cavitation allowance are solved, and the double-suction impeller has the advantages of being large in flow, high in stability and reliability and the like.

Description

Technical Field

[0001] This invention relates to an electronic water pump, specifically a dual-suction electronic water pump. Background Technology

[0002] Existing electronic water pump technology faces numerous challenges that limit its application in high-pressure, high-flow-rate scenarios: 1. Limitations of single-suction structure: When facing high-pressure conditions, the impeller of a traditional single-suction electronic water pump is impacted by the liquid flow on one side, generating a large axial force, which leads to accelerated bearing wear, shortens the service life of the water pump, and makes it difficult to meet the demand for large flow rates, thus limiting its application in high-power equipment.

[0003] 2. Cavitation Issues: Electric water pumps operate at relatively high speeds, typically 4500-6000 RPM. As the speed increases, the net positive suction head (NPSH) rises. Furthermore, the complex inlet piping on the pump further increases inlet flow resistance, making it more susceptible to cavitation. Dual-suction pumps, with water entering from both sides of the impeller simultaneously and a low inlet flow velocity, effectively prevent cavitation.

[0004] 3. Efficiency and stability issues: Conventional water pumps operate at high speeds, resulting in higher specific speeds, increased hydraulic losses, and reduced efficiency, affecting the stable operation and reliability of the pump. Double-suction impellers effectively reduce specific speeds, making it easier to achieve high-efficiency impellers.

[0005] For the battery thermal management system of new energy vehicles, with the improvement of battery energy density and the development of fast charging technology, the battery generates a lot of heat during charging and discharging, requiring an efficient cooling system to maintain the battery's optimal operating temperature. Traditional water pumps cannot meet the requirements of high-pressure, high-flow-rate liquid delivery needed to quickly remove large amounts of heat, leading to battery overheating, affecting battery performance and lifespan, and even posing safety hazards.

[0006] Therefore, developing a high-efficiency, stable, and pressure-resistant double-suction electronic water pump is of great practical significance. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dual-suction electronic water pump.

[0008] According to the technical solution provided by the present invention, the double-suction electronic water pump includes a pump body, a double-suction impeller, a front pump cover, a rear pump cover, a first bearing, a motor housing, a first thrust disc seat, a first thrust disc, a bearing seat, a control board, a breather valve, a rear cover, a second bearing, a motor rotor, a shielding sleeve, a motor stator, a hollow shaft, a third bearing, a return water pipe, a front end cover, a second thrust disc seat, and a second thrust disc; A front pump cover is fixed to the front end of the pump body, and the pump body and the front pump cover are sealed together. A front cover is fixed to the front end of the front pump cover, and the front pump cover and the front cover are sealed together. A third bearing is fixed inside the front cover, and a return water pipe is fixed on the front cover. A rear pump cover is fixed at the rear end of the pump body. A rear pump cover flow hole is provided on the rear pump cover. The pump body and the rear pump cover are sealed together. A first bearing is fixed inside the rear pump cover. A motor housing is fixed at the rear end of the rear pump cover. The rear pump cover and the motor housing are sealed together. A rear cover is fixed at the rear end of the motor housing. A breather valve mounting hole is provided on the rear cover. A breather valve is fixed inside the breather valve mounting hole. The internal cavities of the front pump cover and the rear pump cover form a semi-spiral suction chamber; A bearing housing is fixed inside the motor housing between the rear pump cover and the rear cover. A second bearing bush is fixed inside the bearing housing. A bearing housing flow groove is provided on the bearing housing that contacts the second bearing bush. A control board is fixed at the rear end of the bearing housing. Thermal grease is applied to the rear end face of the bearing housing. The thermal grease contacts the IPM module on the control board. The front end of the shielding sleeve is fixed to the rear pump cover, and the rear end of the shielding sleeve is fixed to the bearing housing. The shielding sleeve, the rear pump cover, and the bearing housing are sealed together. The motor stator is located between the shielding sleeve and the motor housing and is fixed inside the motor housing. The hollow shaft is installed inside the first bearing, the second bearing, and the third bearing. There is a gap between the outer circle of the hollow shaft and the inner circles of the first bearing, the second bearing, and the third bearing. A double suction impeller and a motor rotor are fixed on the hollow shaft. The motor rotor is engaged with the motor stator. There is a gap between the motor rotor and the shielding sleeve. A first thrust disk seat is fixed on the hollow shaft between the first bearing and the motor rotor. A first thrust disk is provided in the first thrust disk seat. A first thrust disk flow groove is provided on the front end face of the first thrust disk. A second thrust disk seat is fixed on the hollow shaft between the corresponding motor rotor and the second bearing. A second thrust disk is provided inside the second thrust disk seat, and a second thrust disk flow groove is provided on the rear end face of the second thrust disk.

[0009] Preferably, the first bearing bush is interference-fitted with the rear pump cover, the second bearing bush is interference-fitted with the bearing housing, and the third bearing bush is interference-fitted with the front cover.

[0010] Preferably, the hollow shaft is interference-fitted with both the first thrust plate seat and the second thrust plate seat.

[0011] Preferably, the breathing valve is fixed in the breathing valve mounting hole on the rear cover by a snap fastener.

[0012] Preferably, there is a gap of 0.06-0.12 mm between the outer circle of the hollow shaft and the inner circles of the first bearing, the second bearing, and the third bearing.

[0013] The present invention has the following advantages: 1. High Flow Rate: The dual-suction impeller structure effectively balances axial force, enabling the pump to operate stably under high pressure while improving flow delivery capacity. Compared with traditional single-suction pumps, at the same speed and flow rate, the dual-suction electronic pump of this invention has a speed reduction of about 30% and a flow rate increase of nearly 100%, meeting the stringent requirements of new energy vehicle thermal management systems for high-pressure, high-flow-rate liquid delivery.

[0014] 2. High stability and reliability: The double-suction impeller structure balances axial force, reducing vibration and noise during pump operation and improving stability. The overall static sealing structure and excellent lubrication system effectively prevent liquid leakage and bearing wear, improving the pump's reliability and service life.

[0015] 3. Low NPSH: Because this invention can improve flow delivery capacity, it can effectively reduce the design speed. At the same time, the semi-spiral suction chamber formed by the internal cavities of the front and rear pump covers can effectively reduce the NPSH of the water pump, making the water pump applicable to a wider range of working conditions.

[0016] 4. High Efficiency: Due to the high speed of water pumps, the specific speed of conventional water pumps is close to 200, resulting in decreased efficiency and the problem of rotational stall at low flow rates. This invention, using a double-suction impeller, effectively reduces the specific speed and improves the pump's operating efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a front view of the bearing housing in this invention.

[0019] Figure 3 yes Figure 2 AA sectional view. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A type of double-suction electronic water pump, such as Figure 1-3As shown, it includes a pump body 1, a double-suction impeller 2, a front pump cover 3, a rear pump cover 4, a first bearing 5, a motor housing 6, a first thrust disc seat 7, a first thrust disc 8, a bearing seat 9, a control board 10, a breather valve 11, a rear cover 12, a second bearing 13, a motor rotor 14, a shielding sleeve 15, a motor stator 16, a hollow shaft 17, a third bearing 18, a return water pipe 19, a front end cover 20, a second thrust disc seat 21, and a second thrust disc 22; A front pump cover 3 is fixed at the front end of the pump body 1, and the pump body 1 and the front pump cover 3 are sealed together. A front cover 20 is fixed at the front end of the front pump cover 3, and the front pump cover 3 and the front cover 20 are sealed together. A third bearing 18 is fixed inside the front cover 20, and a return water pipe 19 is fixed on the front cover 20. A rear pump cover 4 is fixed at the rear end of the pump body 1. A rear pump cover flow hole 4.1 is provided on the rear pump cover 4. The pump body 1 and the rear pump cover 4 are sealed together. A first bearing 5 is fixed inside the rear pump cover 4. A motor housing 6 is fixed at the rear end of the rear pump cover 4. The rear pump cover 4 and the motor housing 6 are sealed together. A rear cover 12 is fixed at the rear end of the motor housing 6. A breather valve mounting hole is provided on the rear cover 12. A breather valve 11 is fixed inside the breather valve mounting hole. The internal cavities of the front pump cover 3 and the rear pump cover 4 form a semi-spiral suction chamber; A bearing seat 9 is fixed inside the motor housing 6 between the rear pump cover 4 and the rear cover 12. A second bearing bush 13 is fixed inside the bearing seat 9. A bearing seat flow groove 9.1 is provided on the bearing seat 9 that contacts the second bearing bush 13. A control board 10 is fixed at the rear end of the bearing seat 9. Thermal grease is applied to the rear end face of the bearing seat 10. The thermal grease contacts the IPM module on the control board 10. The heat generated by the IPM module is carried away by the flow medium inside the bearing seat 9. The front end of the shielding sleeve 15 is fixed on the rear pump cover 4, and the rear end of the shielding sleeve 15 is fixed on the bearing seat 9. The shielding sleeve 15 is sealed with the rear pump cover 4 and the bearing seat 9. The motor stator 16 is located between the shielding sleeve 15 and the motor housing 6 and is fixed inside the motor housing 6. The hollow shaft 17 is installed inside the first bearing 5, the second bearing 13 and the third bearing 18. There is a gap between the outer circle of the hollow shaft 17 and the inner circle of the first bearing 5, the inner circle of the second bearing 13 and the inner circle of the third bearing 18. The double suction impeller 2 and the motor rotor 14 are fixed on the hollow shaft 17. The motor rotor 14 cooperates with the motor stator 16. There is a gap between the motor rotor 14 and the shielding sleeve 15. A first thrust disk seat 7 is fixed on the hollow shaft 17 between the first bearing 5 and the motor rotor 14. A first thrust disk 8 is provided in the first thrust disk seat 7. A first thrust disk flow groove is provided on the front end face of the first thrust disk 8 to facilitate the formation of a liquid film on the friction pair with the rear end face of the first bearing 5 and to carry away the heat generated by friction. A second thrust disk seat 21 is fixed on the hollow shaft 17 between the corresponding motor rotor 14 and the second bearing 13. A second thrust disk 22 is provided inside the second thrust disk seat 21. A second thrust disk flow groove is provided on the rear end face of the second thrust disk 22 to facilitate the formation of a liquid film on the friction pair with the front end face of the second bearing 13 and to carry away the heat generated by friction.

[0022] The first bearing 5 is interference-fitted with the rear pump cover 4, the second bearing 13 is interference-fitted with the bearing housing 9, and the third bearing 18 is interference-fitted with the front cover 20.

[0023] The hollow shaft 17 is interference-fitted with both the first thrust plate seat 7 and the second thrust plate seat 21.

[0024] The breathing valve 11 is fixed in the breathing valve mounting hole on the rear cover 12 by a snap fastener.

[0025] There is a gap of 0.06-0.12mm between the outer circle of the hollow shaft 17 and the inner circle of the first bearing 5, the inner circle of the second bearing 13, and the inner circle of the third bearing 18.

[0026] In this invention, the pump body 1 adopts a cylindrical bag structure. The front pump cover 3 and the rear pump cover 4, which are connected to the axial sides of the pump body 1, together form a volute flow channel. The internal cavities of the front pump cover 3 and the rear pump cover 4 form the semi-spiral suction chamber required for the double-suction pump.

[0027] The rear pump cover 4 and the motor housing 6 are fitted together by a stop structure, and the rear pump cover 4 provides support to the first bearing 5 through the stop structure.

[0028] The bearing seat 9 and the motor housing 6 are fitted together by a stop structure, and the bearing seat 9 provides support to the second bearing bush 13 through the stop structure.

[0029] The front end of the shielding sleeve 15 is fitted with the rear pump cover 4 through a stop structure, and the rear end of the shielding sleeve 15 is fitted with the bearing seat 9 through a stop structure. The shielding sleeve 15 separates the motor stator 16 and the motor rotor 14, preventing coolant from entering the motor stator 16.

[0030] The motor stator 16 and the motor housing 6 are interference fit, and the motor rotor 14 and the hollow shaft 17 are interference fit.

[0031] In this invention, the first bearing 5, the second bearing 13, and the third bearing 18 are all cylindrical structures. They are all made of high-hardness materials such as graphite or ceramic, which have good wear resistance and self-lubricating properties, and a good wear life. The shaft is made of martensitic stainless steel with quenching and tempering treatment to give it good hardness and form a friction pair with the bearings.

[0032] The hollow shaft 17 rotates at high speed between the first bearing 5, the second bearing 13 and the third bearing 18, and the first thrust disk 8 and the first bearing 5, the second bearing 13 and the second thrust disk 22 form an axial positioning of the motor rotor 14.

[0033] The double suction impeller 2 is connected to the hollow shaft 17 by a key. Both sides of the double suction impeller 2 are fixed to the hollow shaft 17 by shaft retaining rings, so that the double suction impeller 2 cannot move axially.

[0034] During operation, taking advantage of the unique spatial characteristics of automotive electronic water pumps, high-pressure water is drawn from a suitable position on the pump casing and enters the return water pipe 19. A small flow of high-pressure water flows into the suction chamber through the tiny gap between the inner circle of the third bearing 18 and the outer circle of the hollow shaft 17, forming the first loop. A large flow of high-pressure water flows through the axial hole of the hollow shaft 17 to the second bearing 13. Most of it flows out from the bearing housing flow groove 9.1, and a small portion flows out from the tiny gap between the outer circle of the hollow shaft 17 and the inner circle of the second bearing 13, flows through the gap between the motor rotor 14 and the shielding sleeve 15, and enters the suction chamber through the flow hole 4.1 in the rear pump cover, forming the second loop.

[0035] High-pressure water washes and cools the friction pairs of the first bearing 5, the second bearing 13, and the third bearing 18 with the hollow shaft 17. At the same time, the high-pressure water can remove the heat generated by the IPM module and the motor rotor.

[0036] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double-suction electronic water pump, comprising a pump body (1), a double-suction impeller (2), a front pump cover (3), a rear pump cover (4), a first bearing (5), a motor housing (6), a first thrust disc seat (7), a first thrust disc (8), a bearing seat (9), a control board (10), a breather valve (11), a rear cover (12), a second bearing (13), a motor rotor (14), a shielding sleeve (15), a motor stator (16), a hollow shaft (17), a third bearing (18), a return water pipe (19), a front end cover (20), a second thrust disc seat (21), and a second thrust disc (22); Its characteristics are: A front pump cover (3) is fixed at the front end of the pump body (1), and the pump body (1) and the front pump cover (3) are sealed together. A front cover (20) is fixed at the front end of the front pump cover (3), and the front pump cover (3) and the front cover (20) are sealed together. A third bearing (18) is fixed inside the front cover (20), and a return water pipe (19) is fixed on the front cover (20). A rear pump cover (4) is fixed at the rear end of the pump body (1). A rear pump cover flow hole (4.1) is provided on the rear pump cover (4). The pump body (1) and the rear pump cover (4) are sealed together. A first bearing (5) is fixed inside the rear pump cover (4). A motor housing (6) is fixed at the rear end of the rear pump cover (4). The rear pump cover (4) and the motor housing (6) are sealed together. A rear cover (12) is fixed at the rear end of the motor housing (6). A breather valve mounting hole is provided on the rear cover (12). A breather valve (11) is fixed inside the breather valve mounting hole. The internal cavities of the front pump cover (3) and the rear pump cover (4) form a semi-spiral suction chamber; A bearing seat (9) is fixed inside the motor housing (6) between the rear pump cover (4) and the rear cover (12). A second bearing bush (13) is fixed inside the bearing seat (9). A bearing seat flow groove (9.1) is provided on the bearing seat (9) that contacts the second bearing bush (13). A control board (10) is fixed at the rear end of the bearing seat (9). Thermal grease is applied to the rear end face of the bearing seat (10). The thermal grease contacts the IPM module on the control board (10). The front end of the shielding sleeve (15) is fixed on the rear pump cover (4). The rear end of the shielding sleeve (15) is fixed on the bearing seat (9). The shielding sleeve (15) is sealed with the rear pump cover (4) and the bearing seat (9). The motor stator (16) is located between the shielding sleeve (15) and the motor housing (6) and the motor stator (16) is fixed inside the motor housing (6). The hollow shaft (17) is installed inside the first bearing shell (5), the second bearing shell (13) and the third bearing shell (18). There is a gap between the outer circle of the hollow shaft (17) and the inner circle of the first bearing shell (5), the inner circle of the second bearing shell (13) and the inner circle of the third bearing shell (18). A double suction impeller (2) and a motor rotor (14) are fixed on the hollow shaft (17). The motor rotor (14) is engaged with the motor stator (16). There is a gap between the motor rotor (14) and the shielding sleeve (15). A first thrust disk seat (7) is fixed on the hollow shaft (17) between the first bearing (5) and the motor rotor (14). A first thrust disk (8) is provided inside the first thrust disk seat (7). A first thrust disk flow groove is provided on the front end face of the first thrust disk (8). A second thrust disk seat (21) is fixed on the hollow shaft (17) between the corresponding motor rotor (14) and the second bearing (13). A second thrust disk (22) is provided inside the second thrust disk seat (21). A second thrust disk flow groove is provided on the rear end face of the second thrust disk (22).

2. The dual-suction electronic water pump as described in claim 1, characterized in that: The first bearing shell (5) is interference-fitted with the rear pump cover (4), the second bearing shell (13) is interference-fitted with the bearing seat (9), and the third bearing shell (18) is interference-fitted with the front cover (20).

3. The dual-suction electronic water pump as described in claim 1, characterized in that: The hollow shaft (17) is in an interference fit with both the first thrust plate seat (7) and the second thrust plate seat (21).

4. The dual-suction electronic water pump as described in claim 1, characterized in that: The breathing valve (11) is fixed in the breathing valve mounting hole on the rear cover (12) by a snap fastener.

5. The dual-suction electronic water pump as described in claim 1, characterized in that: The outer circle of the hollow shaft (17) has a gap of 0.06-0.12mm with the inner circle of the first bearing (5), the inner circle of the second bearing (13), and the inner circle of the third bearing (18).

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