Highly sealed electronic water pump

Abstract

The utility model discloses a high sealing electronic water pump, including motor shell, shield cover, water pump shell, motor end cover, rotor subassembly and stator subassembly, the connecting end surface of motor shell and water pump shell is equipped with U type sealing washer, the back of U type sealing washer and water pump shell end surface are opposite, the shield cover has the locating end surface of cooperation installation with the inner ring end surface of U type sealing washer and the bending part of the U type groove of the stretch into U type sealing washer, and the bending part has the locating side of the inner side of U type groove and the fixed end surface of the inner bottom of U type groove, and the outer ring of U type sealing washer is radially compressed between motor shell and water pump shell, the utility model discloses between water pump shell and motor shell adopts U type sealing structure, and the opening of U type sealing washer is opposite to pump cavity simultaneously, and the comprehensive sealing of radial and axial is realized by the bending design of shield cover front cover and the compression of motor shell and water pump shell, guarantees the liquid in pump cavity not to leak, and is convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of water pump design technology, and in particular to a high-sealing electronic water pump. Background Technology

[0002] Most existing electronic water pumps use a shielding sleeve to separate the stator cavity and rotor cavity, making the stator cavity a dry cavity and the rotor cavity a wet cavity.

[0003] In the prior art, the seal between the pump housing 2 and the motor housing 3 uses an L-shaped sealing gasket 1 (e.g., Figure 1 As shown in the diagram, due to the high power and pressure within the pump chamber, the sealing requirements between the pump casing and the motor casing are increased. This sealing structure only provides an axial seal between the pump casing and the motor casing, leaving the radial seal unreliable, thus failing to guarantee the pump's sealing performance under long-term operation. Furthermore, the front cover is flat, causing the liquid within the pump chamber formed by the pump casing and the front cover to flow towards the connection point, putting pressure on the sealing ring and hindering sealing.

[0004] Existing technologies also achieve radial sealing through the design of sealing grooves on the water pump isolation sleeve, such as the two sealing forms mentioned in the background art of patent number CN202120708280. However, the sealing gaskets in these two sealing forms are simple O-rings with small sealing contact surfaces. Once the isolation sleeve or rear cover is deformed, the seal will fail. Therefore, they are not suitable for sealing areas with high water pressure, such as the connection between the motor housing and the water pump housing.

[0005] Therefore, it is necessary to design a sealing structure that not only meets the sealing requirements between the motor housing and the pump housing, but also facilitates assembly. Utility Model Content

[0006] To address the technical problem that the existing sealing structure between the pump housing and the motor housing cannot achieve complete radial and axial sealing or has poor sealing effect, this utility model provides a high-sealing electronic water pump to solve the above problems.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a high-sealing electronic water pump, including a motor housing, a shielding sleeve, a water pump housing, a motor end cover, a rotor assembly, and a stator assembly; the shielding sleeve is located inside the motor housing and forms a cavity with the motor housing to accommodate the stator assembly; the rotor assembly is arranged inside the shielding sleeve; the water pump housing is connected to the motor housing; and the motor end cover is located at both ends of the motor housing.

[0008] A U-shaped sealing ring is provided on the connection end face of the motor housing and the water pump housing. The back of the U-shaped sealing ring abuts against the end face of the water pump housing. The shielding sleeve has a positioning end face that mates with the inner end face of the U-shaped sealing ring and a bent portion that extends into the U-shaped groove of the U-shaped sealing ring. The bent portion has a positioning side face that abuts against the inner side face of the U-shaped groove and a fixing end face that abuts against the inner bottom face of the U-shaped groove. The end of the motor housing extends into the U-shaped groove and abuts against the bent portion, and the outer ring of the U-shaped sealing ring is radially pressed between the motor housing and the water pump housing.

[0009] In an optional embodiment of this utility model, the outer ring height of the U-shaped sealing ring is higher than the inner ring height.

[0010] In an optional embodiment of this utility model, the outer surface of the outer ring of the U-shaped sealing ring has a plurality of protrusions spaced apart.

[0011] In an optional embodiment of this utility model, the bent portion is radially pressed between the motor housing and the inner ring of the U-shaped sealing ring.

[0012] In an optional embodiment of this utility model, the motor housing is provided radially from the inside to the outside with a first end face extending into the U-shaped groove, a second end face facing the outer ring of the U-shaped sealing ring, and a third end face connected to the end face of the water pump housing. The third end face, the second end face, and the first end face protrude sequentially along the axial direction.

[0013] In an optional embodiment of this utility model, the shielding sleeve includes a cylindrical body and a front cover and a rear cover located at both ends of the cylindrical body, wherein the front cover cooperates with a U-shaped sealing ring.

[0014] In an optional embodiment of this utility model, the bent portion has an L-shaped structure or a U-shaped structure.

[0015] In an optional embodiment of this utility model, the motor end cover includes a front end cover and a rear end cover. The front end cover is connected to the water pump housing and abuts against the back of the U-shaped sealing ring.

[0016] In an optional embodiment of this utility model, a bearing chamber is integrally formed on the motor end cover.

[0017] In an optional embodiment of this utility model, the end of the front cover facing the water pump housing has a sloping surface that gradually slopes towards the central axis from the water pump housing toward the motor housing.

[0018] In an optional embodiment of this utility model, the contact surface between the front end cover and the water pump housing is a stepped surface.

[0019] The beneficial effects of this utility model are:

[0020] (1) This utility model uses a U-shaped sealing structure to seal the water pump housing and the motor housing. At the same time, the opening of the U-shaped sealing ring is facing away from the pump cavity. The bending design of the shielding sleeve front cover and the pressing of the motor housing and the water pump housing are used to achieve a complete seal in the radial and axial directions, ensuring that the liquid in the pump cavity does not leak and is easy to install.

[0021] (2) This utility model increases the sealing area by extending the outer ring height of the U-shaped sealing ring, thereby increasing the reliability of radial sealing.

[0022] (3) By setting a slope that is inclined towards the middle on the front end cover, this utility model ensures that the liquid in the cavity formed by the pump housing and the front end cover can gather towards the center of the pump cavity and move away from the connection between the pump housing and the front end cover, thereby reducing the amount of liquid that seeps into the U-shaped sealing ring from the connection between the two, and thus reducing the sealing pressure of the U-shaped sealing ring. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the sealing structure of an electronic water pump in the prior art;

[0025] Figure 2 This is an axial sectional view of a specific embodiment of the high-sealing electronic water pump described in this utility model;

[0026] Figure 3 This is a perspective view of the U-shaped sealing ring in this utility model;

[0027] Figure 4 This is a schematic diagram of the fit between the U-shaped sealing ring and the front cover in this utility model;

[0028] Figure 5 This is a schematic diagram of the sealing structure at the connection between the pump casing and the motor casing;

[0029] Figure 6 This is a schematic diagram of the front end cover in this utility model.

[0030] In the diagram, 1. Sealing gasket, 2. Pump housing, 3. Motor housing, 4. Front cover, 5. Bearing chamber, 6. Stator assembly, 7. Shielding sleeve, 701. Cylinder body, 702. Front cover, 703. Rear cover, 8. Pump chamber, 9. Stator chamber, 10. Rotor chamber, 11. U-shaped sealing ring, 1101. Inner ring, 1102. Outer ring, 1103. U-shaped groove, 12. Positioning end face, 13. Positioning side, 14. Fixed end face, 15. Bending part, 16. First end face, 17. Second end face, 18. Third end face, 19. Stop, 20. Protrusion, 21. Sloping surface, 22. Stepped surface, 23. Rear end cover. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] Example 1

[0033] like Figure 2 As shown, a high-sealing electronic water pump includes a motor housing 3, a shielding sleeve 7, a water pump housing 2, a motor end cover, a rotor assembly, and a stator assembly 6 (the rotor assembly is not shown in the figure); the water pump housing 2 is connected to the motor housing 3, and the motor end cover is located at both ends of the motor housing 3.

[0034] The motor housing 3 and the motor end cover form the motor cavity, which is divided into a stator cavity 9 and a rotor cavity 10. The motor end cover typically includes a front cover 4 and a rear cover 23. Taking the end where the pump housing 2 is located as the front end, the cavity formed by the front cover 4 and the pump housing 2 is the pump cavity 8. The shielding sleeve 7 is located inside the motor housing 3 and, together with the motor housing 3, forms a cavity to accommodate the stator assembly 6, which is the stator cavity 9. The interior of the shielding sleeve 7 and the motor end cover form the rotor cavity 10, which is used to install the rotor assembly. The stator assembly 6 needs to be energized, so the stator cavity 9 must be sealed to prevent liquid from the pump cavity 8 from entering the stator cavity 9 through the connection between the motor housing 3 and the pump housing 2.

[0035] like Figures 2-5 As shown, a U-shaped sealing ring 11 is provided on the connecting end face of the motor housing 3 and the water pump housing 2. The back side of the U-shaped sealing ring 11 abuts against the end face of the water pump housing 2. The back side refers to the end face opposite to the opening direction of the U-shaped sealing ring 11. The shielding sleeve 7 has a positioning end face 12 that mates with the end face of the inner ring 1101 of the U-shaped sealing ring 11 and a bent portion 15 that extends into the U-shaped groove 1103 of the U-shaped sealing ring 11. The bent portion 15 abuts against the inner side of the U-shaped groove 1103. The positioning side 13 and the inner bottom surface of the U-shaped groove 1103 abut against the fixed end face 14. The positioning end face 12 is used to position the end face of the inner ring 1101 of the U-shaped sealing ring 11, the positioning side 13 is used to radially position the U-shaped sealing ring 11, and the fixed end face 14 is used to axially press the U-shaped sealing ring 11. The end of the motor housing 3 extends into the U-shaped groove 1103 and abuts against the bent part 15, and the outer ring 1102 of the U-shaped sealing ring 11 is radially pressed between the motor housing 3 and the water pump housing 2. The shielding sleeve 7 typically includes a cylindrical body 701 and a front cover 702 and a rear cover 703 located at both ends of the cylindrical body 701. The front cover 702 mates with the U-shaped sealing ring 11.

[0036] In terms of installation, the motor housing 3 and the water pump housing 2 are fixed with bolts. The motor housing 3 extends into the U-shaped groove 1103 to axially press the bent part 15 and the U-shaped sealing ring 11 together. In the radial direction, the inner ring 1101 of the U-shaped sealing ring 11 is pressed together by the positioning end face 12. (It should be noted that...) Figure 4 The front cover 702 does not contact the inner ring 1101 in the cross section shown in the figure. This is because the front end face of the front cover 702 is not flat. In fact, there are positioning end faces 12 that contact the inner ring 1101 in other cross sections. The outer ring 1102 of the U-shaped sealing ring 11 is pressed by the motor housing 3 and the water pump housing 2. During installation, the shielding sleeve 7 is directly inserted from the front of the U-shaped sealing ring 11 and then installed in conjunction with the end of the motor housing 3. The assembly is simple and can be installed quickly and accurately by relying on the cooperation of various positioning surfaces.

[0037] From the perspective of sealing effect, the opening direction of the U-shaped sealing ring 11 faces away from the pump chamber 8, which can prevent liquid from directly entering the U-shaped groove 1103 of the U-shaped sealing ring 11. Furthermore, the U-shaped structure of the U-shaped sealing ring 11 can increase its contact area with the pump housing 2, thereby improving the sealing effect. When the liquid in the pump chamber 8 impacts the U-shaped sealing ring 11 radially outward from the positioning end face 12, the inner ring 1101 of the U-shaped sealing ring 11 can block the liquid. The liquid needs to pass through the contact point between the inner ring 1101 and the positioning end face 12 and the contact point between the inner ring 1101 and the positioning side 13 in sequence before entering the U-shaped groove 1103. When the liquid in the pump chamber 8 leaks to the outer periphery of the U-shaped sealing ring 11, the liquid impact force in this part is smaller, and the outer ring 1102 of the U-shaped sealing ring 11 can block the liquid. The liquid is mainly prevented from entering the U-shaped groove 1103 by the contact point between the inner surface of the outer ring 1102 and the motor housing 3.

[0038] The heights of the outer ring 1102 and the inner ring 1101 can be equal or unequal. The height refers to the difference in distance between the ends of the outer ring 1102 and the inner ring 1101 and the inner surface of the U-shaped groove 1103. Since there are multiple seals at the inner ring 1101, such as the positioning end face 12 on the front cover 4 and the bending part 15, in the preferred embodiment, the height of the outer ring 1102 is higher than that of the inner ring 1101, thereby increasing the contact area between the inner and outer sides of the outer ring 1102 and the pump housing 2 and the motor housing 3.

[0039] The bending portion 15 can be either L-shaped or U-shaped. When the bending portion 15 is U-shaped, the fitting precision between the bending portion 15 and the U-shaped groove 1103 is required to be high; otherwise, it cannot be guaranteed that both sides of the bending portion 15 simultaneously contact the two side walls of the U-shaped groove 1103, making it difficult to ensure a sealed contact between the two sides. Therefore, in this embodiment, the bending portion 15 is preferably L-shaped, meaning that the bending portion 15 only contacts the inner side and inner bottom surface of the U-shaped groove 1103, while the outer side of the U-shaped groove 1103 abuts against the motor housing 3.

[0040] like Figure 5 As shown, the portion of the motor housing 3 that extends into the U-shaped groove 1103 presses against the fixed end face 14 axially, and is tightly fitted with the positioning side 13 and the outer ring 1102 of the bent portion 15 radially. During the pressing process of the motor housing 3, even if the bent portion 15 deforms, it can ultimately ensure that both the positioning side 13 and the fixed end face 14 are in sealed contact with the U-shaped groove 1103.

[0041] Structure of motor housing 3:

[0042] The motor housing 3 is fixed to the water pump housing 2, and the sealing structure is enclosed within the water pump housing 2 or the motor housing 3. In this embodiment, the motor housing 3, facing the water pump housing 2, is provided radially from the inside to the outside with a first end face 16 extending into the U-shaped groove 1103, a second end face 17 directly opposite the outer ring 1102 of the U-shaped sealing ring 11, and a third end face 18 connected to the end face of the water pump housing 2. The third end face 18, the second end face 17, and the first end face 16 protrude sequentially along the axial direction. Figure 5 As shown, the first end face 16 protrudes axially into the U-shaped groove 1103, and the second end face 17 and the part of the motor housing 3 that extends into the U-shaped groove 1103 form a stop 19. The outer ring 1102 is located in the stop 19. The end face of the second end face 17 and the end face of the outer ring 1102 may not contact each other. The side wall with the same diameter as the outer diameter of the second end face 17 can form a positioning side 13 that contacts the inner wall of the water pump housing 2, thereby facilitating the positioning and installation of the water pump housing 2 and the motor housing 3.

[0043] Example 2

[0044] Based on Embodiment 1, the outer surface of the outer ring 1102 of the U-shaped sealing ring 11 has multiple protrusions 20 distributed at intervals to reduce the force between the outer ring 1102 and the water pump housing 2 during the installation process, thus facilitating the assembly of the water pump.

[0045] Example 3

[0046] This embodiment optimizes the design of the motor end cover based on the above embodiment.

[0047] The outer edge of the front cover 4 abuts against the water pump housing 2, and the outer edge of the rear end abuts against the back of the U-shaped sealing ring 11. To prevent liquid from leaking from the contact surface between the front cover 4 and the water pump housing 2 to the outer ring 1102, such as... Figure 5 and Figure 6 As shown, in this embodiment, a ramp 21 is provided at the end of the front cover 4 facing the pump housing 2, which gradually slopes towards the central axis from the pump housing 2 towards the motor housing 3. That is, the ramp 21 gradually slopes towards the center from front to back. At this time, the liquid in the pump chamber 8 can gather towards the center of the pump chamber 8 and move away from the connection between the pump housing 2 and the front cover 4, reducing the amount of liquid that seeps into the U-shaped sealing ring 11 from the connection between the two, thereby reducing the sealing pressure of the U-shaped sealing ring 11.

[0048] In terms of assembly, the contact surface between the front cover 4 and the water pump housing 2 is a stepped surface 22. During the assembly process, the stepped surface 22 can provide preliminary positioning, which helps to speed up the assembly process.

[0049] In a further design, a bearing chamber 5 is integrally formed on the motor end cover. The bearing chamber 5 is used to install the bearing that rotates with the rotor shaft of the rotor assembly. After the bearing chamber 5 is integrally formed, no additional welding is required, reducing assembly steps. Furthermore, since the bearing chamber 5 extends into the shielding sleeve 7, it is more convenient to radially position the motor end cover and the motor housing 3 or the shielding sleeve 7.

[0050] This invention improves the sealing structure at the connection between the motor housing 3 and the water pump housing 2, and optimizes the design of the motor end cover, thereby enhancing both the sealing effect and the assembly efficiency. The radial seal is achieved by the motor housing 3 extending into the U-shaped groove 1103, with both sides of the motor housing 3 engaging with the water pump housing 2 and the shielding sleeve 7. The axial seal is achieved by the end of the motor housing 3 engaging with the water pump housing 2, the shielding sleeve 7, and the front end cover 4.

[0051] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0053] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-sealing electronic water pump, characterized by: It includes a motor housing (3), a shielding sleeve (7), a water pump housing (2), a motor end cover, a rotor assembly, and a stator assembly (6); the shielding sleeve (7) is located inside the motor housing (3) and forms a cavity with the motor housing (3) to accommodate the stator assembly (6); the rotor assembly is disposed inside the shielding sleeve (7); the water pump housing (2) is connected to the motor housing (3); and the motor end cover is located at both ends of the motor housing (3). A U-shaped sealing ring (11) is provided on the connecting end face of the motor housing (3) and the water pump housing (2). The back of the U-shaped sealing ring (11) abuts against the end face of the water pump housing (2). The shielding sleeve (7) has a positioning end face (12) that is fitted with the end face of the inner ring (1101) of the U-shaped sealing ring (11) and a bent part (15) that extends into the U-shaped groove (1103) of the U-shaped sealing ring (11). The bent part (15) has a positioning side face (13) that abuts against the inner side of the U-shaped groove (1103) and a fixing end face (14) that abuts against the inner bottom surface of the U-shaped groove (1103). The end of the motor housing (3) extends into the U-shaped groove (1103) and abuts against the bent part (15). The outer ring (1102) of the U-shaped sealing ring (11) is radially pressed between the motor housing (3) and the water pump housing (2).

2. The high-sealing electronic water pump according to claim 1, characterized by: The height of the outer ring (1102) of the U-shaped sealing ring (11) is higher than the height of the inner ring (1101).

3. The high sealing electronic water pump according to claim 1, characterized in that: The outer surface of the outer ring (1102) of the U-shaped sealing ring (11) has multiple protrusions (20) spaced apart.

4. The high sealable electric water pump according to claim 1, characterized by: The motor housing (3) facing the water pump housing (2) has a first end face (16) extending into the U-shaped groove (1103), a second end face (17) facing the outer ring (1102) of the U-shaped sealing ring (11), and a third end face (18) connected to the end face of the water pump housing (2) in a radial direction from the inside to the outside. The third end face (18), the second end face (17) and the first end face (16) protrude in sequence along the axial direction.

5. The high sealable electric water pump according to claim 1, characterized in that: The shielding sleeve (7) includes a cylindrical body (701) and a front cover (702) and a rear cover (703) located at both ends of the cylindrical body (701). The front cover (702) is fitted with a U-shaped sealing ring (11).

6. The high-sealing electronic water pump according to claim 1, characterized in that: The bending portion (15) has an L-shaped or U-shaped structure.

7. The high sealable electric water pump according to claim 1, characterized in that: The motor end cover includes a front end cover (4) and a rear end cover (23). The front end cover (4) is connected to the water pump housing (2), and the front end cover (4) abuts against the back of the U-shaped sealing ring (11).

8. The high sealable electric water pump of claim 1, wherein: The motor end cover has an integrally formed bearing chamber (5).

9. The high sealable electric water pump according to claim 7, characterized in that: The end of the front cover (4) facing the water pump housing (2) has a slope (21) that gradually slopes toward the central axis from the water pump housing (2) toward the motor housing (3).

10. The high sealable electric water pump according to claim 7, characterized in that: The contact surface between the front cover (4) and the pump housing (2) is a stepped surface (22).

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