Automobile electronic water pump

Abstract

According to the automobile electronic water pump, the waterproof installation part is arranged on the pump shell, and the waterproof installation part and the pump shell are of the integrally-formed structure, so that a waterproof sleeve structure does not need to be additionally arranged, the overall weight of the automobile electronic water pump is reduced, gaps are reduced, and the sealing performance of the water pump is improved. Besides, the design of the waterproof installation part enables the rotor installation cavity and the control panel installation cavity to be clearly separated, heat generated by the rotor assembly and thermal interference between control panel circuits are effectively prevented, and therefore the stability and reliability of the automobile electronic water pump are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive electric water pumps, and particularly relates to an automotive electric water pump. Background Art

[0002] In the prior art, in order to improve the sealing performance, a water isolation sleeve is added between the pump housing and the volute housing of the automotive electric water pump. However, the setting of the water isolation sleeve not only increases the manufacturing cost, but also makes the installation and maintenance relatively cumbersome. Moreover, in the prior art, the outer shell of the inner rotor of the automotive electric water pump is usually made of metal. After the outer shell is welded to the end cover, cracks are likely to occur at the welding point due to factors such as temperature difference and vibration, thereby affecting the sealing performance and service life of the automotive electric water pump, and the metal outer shell will increase the overall weight of the automotive electric water pump. Content of the Utility Model

[0003] In view of this, the utility model provides an automotive electric water pump.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] An automotive electric water pump, comprising a volute housing, a pump housing and a rear end cover. A rotor installation cavity is formed between the volute housing and the pump housing, and a control board installation cavity is formed between the pump housing and the rear end cover. The pump housing is arranged between the volute housing and the rear end cover. One end of the pump housing close to the volute housing is concavely formed with a waterproof installation part, and the waterproof installation part separates the rotor installation cavity from the control board installation cavity. A rotor assembly is arranged in the rotor installation cavity.

[0006] Preferably, the waterproof installation part is communicated with the rotor installation cavity. The rotor assembly includes an inner rotor, a rotating shaft and an impeller. The inner rotor and the impeller are connected by the rotating shaft. The inner rotor includes a rotor outer shell, a rotor end cover and rotor laminations. A lamination installation cavity is formed between the rotor outer shell and the rotor end cover. The rotating shaft penetrates through the lamination installation cavity. The rotor laminations are sleeved on the part of the rotating shaft located in the lamination installation cavity. A stepped positioning structure is arranged on the rotor end cover, and a shell positioning end is arranged on the rotor outer shell. The shell positioning end and the stepped positioning structure are fixedly welded.

[0007] Preferably, the stepped positioning structure has a first stepped part and a second stepped part. The shell positioning end is the part where the rotor outer shell exceeds the top end face of the rotor laminations. The shell positioning end abuts against the first stepped part. An outer sealing ring groove is formed between the second stepped part and the rotor outer shell. An outer sealing ring is arranged in the outer sealing ring groove. The outer sealing ring is hermetically connected with the rotor outer shell and the rotor end cover respectively.

[0008] Preferably, an inner sealing and positioning end is provided on the part of the rotor end cover extending into the rotor installation cavity. The inner sealing and positioning end is arranged in an annular structure on the side of the rotor end cover close to the rotating shaft. An inner sealing ring groove is formed between the inner sealing and positioning end and the rotating shaft. An inner sealing ring is arranged in the inner sealing ring groove, and the inner sealing ring is in sealing connection with the rotor end cover, the rotating shaft and the rotor laminations respectively.

[0009] Preferably, an installation hole for passing through the rotating shaft is opened at the bottom of the rotor housing. A positioning rib protrudes from the inner wall of the installation hole towards the center of the installation hole. A plurality of the positioning ribs are provided, and a bottom sealing ring is arranged on the positioning ribs. The rotor laminations press the bottom sealing ring.

[0010] Preferably, the wall thickness of the rotor housing is 0.3 mm - 0.6 mm.

[0011] Preferably, the height of the positioning rib is lower than the height of the bottom of the inner wall of the rotor installation cavity, and the bottom sealing ring is in sealing connection with the positioning rib, the rotating shaft and the rotor laminations respectively.

[0012] The beneficial effects of the present utility model are as follows: By providing a waterproof installation part on the pump housing, and the waterproof installation part and the pump housing are of an integrally formed structure, thus eliminating the need to add a water isolation sleeve structure, thereby reducing the overall weight of the automotive electronic water pump and reducing the existence of gaps, improving the sealing performance of the water pump. In addition, the design of the waterproof installation part forms a clear separation between the rotor installation cavity and the control board installation cavity, effectively preventing the heat generated by the rotor assembly from interfering with the control board circuit, thereby ensuring the stability and reliability of the automotive electronic water pump. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Att Figure 1 is a schematic structural diagram of the present utility model;

[0015] Att Figure 2 is Att Figure 1 the enlarged view at A in the figure. Detailed Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0017] The following will further describe the present utility model in conjunction with the accompanying drawings of the specification.

[0018] The present utility model provides the following technical solutions:

[0019] As shown in the Figure 1-2 accompanying drawings, the present utility model discloses an automotive electric water pump, which includes a volute 1, a pump housing 2 and a rear end cover 3. A rotor installation cavity 4 is formed between the volute 1 and the pump housing 2, and a control board installation cavity 6 is formed between the pump housing 2 and the rear end cover 3. A control board 5 is arranged in the control board installation cavity 6. The pump housing 2 is arranged between the volute 1 and the rear end cover 3. One end of the pump housing 2 close to the volute 1 is recessed to form a waterproof installation part 7. The waterproof installation part 7 separates the rotor installation cavity 4 from the control board installation cavity 6, and a rotor assembly is arranged in the rotor installation cavity 4. Specifically, in this design, by arranging the waterproof installation part 7 on the pump housing 2, and the waterproof installation part 7 and the pump housing 2 are of an integrally formed structure, so there is no need to add a water isolation sleeve structure, thereby reducing the overall weight of the automotive electric water pump and reducing the existence of gaps, improving the sealing performance of the water pump. In addition, the design of the waterproof installation part 7 makes a clear separation between the rotor installation cavity 4 and the control board installation cavity 6, effectively preventing the heat generated by the rotor assembly from interfering with the control board 5 circuit, thus ensuring the stability and reliability of the automotive electric water pump.

[0020] Furthermore, the waterproof mounting portion 7 communicates with the rotor mounting cavity 4. The rotor assembly includes an inner rotor 8, a rotating shaft 9, and an impeller 10. The inner rotor 8 and the impeller 10 are connected by the rotating shaft 9. The inner rotor 8 includes a rotor housing 11, a rotor end cover 12, and rotor laminations 13. A lamination mounting cavity 14 is formed between the rotor housing 11 and the rotor end cover 12. The rotating shaft 9 passes through the lamination mounting cavity 14. The rotor laminations 13 are sleeved on the portion of the rotating shaft 9 located in the lamination mounting cavity 14. A stepped positioning structure 15 is provided on the rotor end cover 12. An outer housing positioning end 18 is provided on the rotor housing 11. The outer housing positioning end 18 and the stepped positioning structure 15 are fixed by welding. Specifically, in this embodiment, the stepped positioning structure 15 on the rotor end cover 12 enables the rotor housing 11 to be precisely mounted on the rotor, and the outer housing positioning end 18 and the stepped positioning structure 15 are fixed by welding. This connection method not only ensures the structural stability of the rotor but also enhances the sealing performance of the rotor, preventing water or other liquids from entering the rotor interior, and further improving the reliability and durability of the automotive electronic water pump. Both the outer rotor housing 11 and the outer rotor end cover 12 are made of plastic material. Such a design not only ensures the lightness of the structure but also has good processability and sealing performance.

[0021] Furthermore, the stepped positioning structure 15 has a first stepped portion 16 and a second stepped portion 17. The outer housing positioning end 18 is the part of the rotor housing 11 that extends beyond the top end face of the rotor laminations 13. The outer housing positioning end 18 abuts against the first stepped portion 16 and is fixed to the first stepped portion 16 by ultrasonic welding. An outer sealing ring groove 19 is formed between the second stepped portion 17 and the rotor housing 11. An outer sealing ring 20 is provided in the outer sealing ring groove 19. The outer sealing ring 20 is in sealing contact with both the rotor housing 11 and the rotor end cover 12. Specifically, in this embodiment, by providing an outer sealing ring groove 19 between the outer housing positioning end 18 and the stepped positioning structure 15 and equipping it with an outer sealing ring 20, the waterproof performance of the automotive electronic water pump is further improved. The outer sealing ring 20 can effectively prevent water or other liquids from penetrating from the rotor mounting cavity 4 into the control board mounting cavity 6, thereby protecting the control board 5 circuit from damage.

[0022] Further, an inner sealing and positioning end 21 is provided on the part of the rotor end cover 12 extending into the rotor installation cavity 4. The inner sealing and positioning end 21 is arranged in an annular structure on the side of the rotor end cover 12 close to the rotating shaft 9. An inner sealing ring groove 22 is formed between the inner sealing and positioning end 21 and the rotating shaft 9. An inner sealing ring 23 is arranged in the inner sealing ring groove 22. The inner sealing ring 23 is in sealing contact with the rotor end cover 12, the rotating shaft 9 and the rotor lamination 13 respectively. Specifically, in this embodiment, by providing the inner sealing and positioning end 21 on the rotor end cover 12, forming the inner sealing ring groove 22 between the inner sealing and positioning end 21 and the rotating shaft 9, and equipping with the inner sealing ring 23, the waterproof and sealing performance of the automotive electronic water pump is further enhanced. The inner sealing ring 23 can closely fit between the rotor end cover 12, the rotating shaft 9 and the rotor lamination 13, effectively preventing water or other liquids from penetrating into the rotor installation cavity 4 from the rotating shaft 9, thereby further protecting the rotor assembly and the control board 5 circuit from damage.

[0023] Further, an installation hole 24 for passing through the rotating shaft 9 is opened at the bottom of the rotor housing 11. A positioning rib 25 protrudes from the inner wall of the installation hole 24 towards the center of the installation hole 24. A plurality of positioning ribs 25 are provided. A bottom sealing ring 26 is arranged on the positioning rib 25. The rotor lamination 13 presses the bottom sealing ring 26. The height of the positioning rib 25 is lower than the height of the bottom of the inner wall of the rotor installation cavity 4. The bottom sealing ring 26 is in sealing contact with the positioning rib 25, the rotating shaft 9 and the rotor lamination 13 respectively. Specifically, in this embodiment, by opening the installation hole 24 at the bottom of the rotor housing 11 and arranging the positioning rib 25 and the bottom sealing ring 26 on the inner wall of the installation hole 24, the sealing performance of the automotive electronic water pump is further enhanced. The arrangement of the positioning rib 25 not only provides positioning for the bottom sealing ring 26, but also increases the reliability of the seal. The bottom sealing ring 26 closely fits between the positioning rib 25, the rotating shaft 9 and the rotor lamination 13, effectively preventing water or other liquids from penetrating into the rotor installation cavity 4 from the installation hole 24. In addition, since the height of the positioning rib 25 is lower than the height of the bottom of the inner wall of the rotor installation cavity 4, even if water or other liquids penetrate into the rotor installation cavity 4, they will be quickly guided to the drainage channel, thus avoiding damage to the rotor assembly and the control board 5 circuit by the liquid. This design not only improves the waterproof performance of the automotive electronic water pump, but also ensures its long-term stable operation. And the positioning rib 25 can restrain the bottom sealing ring 26, making it not easy to shift or deform during the installation process, further enhancing the reliability of the seal.

[0024] Furthermore, the wall thickness of the rotor housing 11 is 0.3 mm - 0.6 mm. Specifically, in this embodiment, the wall thickness of 0.3 mm - 0.6 mm not only ensures the durability of the rotor housing 11, enabling it to withstand various stresses and impacts generated during the operation of the automotive electric water pump, but also maintains a relatively light weight, which is beneficial for reducing the burden on the entire automotive electric water pump.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automotive electronic water pump, comprising a volute, a pump housing and a rear end cover, wherein a rotor mounting cavity is formed between the volute and the pump housing, and a control panel mounting cavity is formed between the pump housing and the rear end cover, characterized in that: The pump casing is arranged between the volute and the rear end cover, and one end of the pump casing close to the volute is concave to form a waterproof mounting portion, and the waterproof mounting portion separates the rotor mounting cavity from the control board mounting cavity. A rotor assembly is arranged in the rotor mounting cavity, and the waterproof mounting portion is communicated with the rotor mounting cavity. The rotor assembly includes an inner rotor, a rotating shaft and an impeller. The inner rotor and the impeller are connected by a rotating shaft. The inner rotor includes a rotor shell, a rotor end cover and a rotor lamination. A lamination mounting cavity is formed between the rotor shell and the rotor end cover, and the rotating shaft passes through the lamination mounting cavity. The rotor lamination is sleeved on the part of the rotating shaft located in the lamination mounting cavity. A step positioning structure is arranged on the rotor end cover, and a shell positioning end is arranged on the rotor shell. The shell positioning end is welded and fixed to the step positioning structure.

2. The automotive electronic water pump according to claim 1, characterized in that: The step positioning structure comprises a first step portion and a second step portion, the housing positioning end is the portion of the rotor housing that extends beyond the top end surface of the rotor laminations, the housing positioning end abuts against the first step portion, an outer sealing ring groove is formed between the second step portion and the rotor housing, an outer sealing ring is arranged in the outer sealing ring groove, and the outer sealing ring is respectively sealed with the rotor housing and the rotor end cover.

3. The automotive electronic water pump according to claim 1, characterized in that: An inner sealing positioning end is arranged on the portion of the rotor end cover extending into the rotor installation cavity. The inner sealing positioning end is arranged in an annular structure on the side of the rotor end cover close to the rotating shaft. An inner sealing ring groove is formed between the inner sealing positioning end and the rotating shaft. An inner sealing ring is arranged in the inner sealing ring groove. The inner sealing ring is respectively sealed with the rotor end cover, the rotating shaft and the rotor laminations.

4. The automotive electronic water pump according to claim 1, characterized in that: The bottom of the rotor housing is provided with a mounting hole for passing the rotating shaft, the inner wall of the mounting hole protrudes toward the center of the mounting hole to form a positioning rib, a plurality of the positioning ribs are provided, a bottom sealing ring is arranged on the positioning rib, and the rotor laminations press the bottom sealing ring.

5. The automotive electronic water pump according to claim 1, characterized in that: The wall thickness of the rotor housing is 0.3 mm-0.6 mm.

6. The automotive electronic water pump according to claim 4, characterized in that: The height of the positioning rib is lower than the height of the bottom of the inner wall of the rotor installation cavity, and the bottom sealing ring is respectively sealed with the positioning rib, the rotating shaft and the rotor laminations.

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