Waterproof and breathable rear end cap and electronic water pump using it

Abstract

This utility model discloses a waterproof and breathable rear end cover and an electronic water pump using the same, relating to the technical field of electronic water pumps and their components. It includes a rear end cover body component, a waterproof and breathable membrane, and a vent cover component. A vent is provided at the rear end cover body component. The waterproof and breathable membrane is disposed on the inner side of the rear end cover body component and covers the vent. The vent cover component is disposed on the outer side of the rear end cover body component to form a breathable channel communicating with the vent. This utility model mainly solves the problem of how to provide a waterproof and breathable rear end cover for an electronic water pump. This utility model achieves both waterproof and breathable functions for the electronic water pump, optimizes the gas exchange efficiency of the electronic water pump, enhances the structural protection of the electronic water pump, and improves the reliability and durability of the electronic water pump.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic water pumps and their components, specifically a waterproof and breathable rear end cover and an electronic water pump using the same. Background Technology

[0002] New energy vehicles typically have two or more electronic water pumps. These electronic water pumps are the power source for the entire cooling system of new energy vehicles. The power battery, drive motor, and other components of new energy vehicles all rely on the electronic water pumps to drive the coolant for circulation and cooling.

[0003] The drive circuit board is one of the core components of an electronic water pump. It is used to drive the stator assembly to operate, enabling the stator assembly to generate a rotating magnetic field, which in turn drives the rotor assembly to rotate.

[0004] Because the drive circuit board houses the main controller, power electronic devices for driving the stator assembly, and other necessary peripheral circuits, it generates a significant amount of heat. In existing electronic water pumps, the drive circuit board is typically installed inside the pump housing. When the drive circuit board is running or stopped, its temperature changes, causing temperature variations within the pump housing. Furthermore, the gap between the pump housing and the end cover allows condensation to form in the air inside the housing under certain conditions. When this condensation adheres to the printed circuits and components of the drive circuit board, it can cause metal oxidation and corrosion, ultimately leading to open circuits, short circuits, or other malfunctions on the drive circuit board, preventing it from properly driving the stator assembly.

[0005] Although opening a hole at the rear end cover of the electric water pump can drain the condensate in the pump casing in time, it will also make the pump casing no longer sealed, which will lead to external moisture eroding the drive circuit board.

[0006] In conclusion, how to provide a waterproof and breathable rear end cover for electronic water pumps has become one of the urgent problems to be solved. Utility Model Content

[0007] The purpose of this utility model is to provide a waterproof and breathable rear end cover and an electronic water pump using the same, which can provide a waterproof and breathable rear end cover for the electronic water pump and provide waterproof and breathable performance for the pump casing of the electronic water pump.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a waterproof and breathable rear end cover, comprising a rear end cover body component, a waterproof and breathable membrane, and a vent cover component; a vent is provided at the rear end cover body component; the waterproof and breathable membrane is disposed on the inner side of the rear end cover body component and covers the vent of the rear end cover body component; the vent cover component is disposed on the outer side of the rear end cover body component to form a breathable channel communicating with the vent on the outer side of the rear end cover body component.

[0009] In the above technical solution, a waterproof and breathable membrane fixing plane is formed on the inner side of the rear cover body component around the vent hole; the waterproof and breathable membrane is fixed at the waterproof and breathable membrane fixing plane of the rear cover body component by ultrasonic welding, hot pressing or bonding.

[0010] In the above technical solution, the inner side of the rear cover body component is pulled up from the periphery of the waterproof and breathable membrane fixing plane to form an inner enclosure.

[0011] In the above technical solution, the outer side of the rear cover body component is pulled up at the vent hole to form a vent cap; the vent cap of the rear cover body component has a first side vent grille formed on its side; the outer side of the rear cover body component is pulled up around the vent cap to form an outer perimeter wall; the outer perimeter wall of the rear cover body component has a second side vent grille formed on its side; the vent hole cover component has a third side vent grille formed on its side; the vent hole cover component is fixed at the vent cap of the rear cover body component; the first side vent grille of the vent cap, the second side vent grille of the outer perimeter wall, and the third side vent grille of the vent hole cover component are interconnected to form the venting channel.

[0012] In the above technical solution, the top of the vent cover component is provided with a main hole, and a latch is formed on the inner side of the main hole; the latch of the vent cover component latches onto the top surface of the vent cap of the rear cover body component from the first side vent grille, so as to fix the vent cover component at the vent cap.

[0013] In the above technical solution, the first side vent grille of the vent cap, the second side vent grille of the outer perimeter wall, and the third side vent grille of the vent hole cover component are misaligned with each other in the radial direction.

[0014] In the above technical solution, the distance between the buckle of the vent cover component and the upper end face of the rear cover body component is h; therefore, h ≥ 2mm.

[0015] In the above technical solution, in the rear cover body component, the outer diameter of the vent cap is D1, and the inner diameter of the outer perimeter wall is D2; then: D2:D1 = 1.2~1.4.

[0016] In the above technical solution, reinforcing ribs are provided on the outer perimeter of the rear cover body component.

[0017] An electronic water pump includes the aforementioned waterproof and breathable rear end cap.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The waterproof and breathable rear end cover and the electronic water pump using it are provided by the present utility model. The waterproof and breathable membrane is disposed on the inner side of the rear end cover body component and covers the vent holes of the rear end cover body component. This allows the electronic water pump to prevent water vapor from entering the pump housing component, thereby keeping the inside of the pump housing component and the drive circuit board dry and preventing condensation. At the same time, it allows air to pass through the inside and outside of the pump housing component, avoiding excessive air pressure inside the pump housing component due to heat generation of the drive circuit board. This realizes the waterproof and breathable functions of the electronic water pump, optimizes the gas exchange efficiency of the electronic water pump, enhances the structural protection of the electronic water pump, and improves the reliability and durability of the electronic water pump. Attached Figure Description

[0019] Figure 1 This is one of the perspective views of the waterproof and breathable rear end cover of this utility model.

[0020] Figure 2 This is the second perspective view of the waterproof and breathable rear end cover of this utility model.

[0021] Figure 3 This is one of the exploded views of the waterproof and breathable rear end cover of this utility model.

[0022] Figure 4 This is the second exploded view of the waterproof and breathable rear end cover of this utility model.

[0023] Figure 5 This is a cross-sectional view of the waterproof and breathable rear end cover of this utility model.

[0024] Figure 6 This is a perspective view of the electronic water pump in this utility model.

[0025] The attached figures are labeled as follows: 1. Rear end cover body component; 11. Vent hole; 12. Waterproof and breathable membrane fixing plane; 13. Inner enclosure; 14. Vent cap; 141. First side vent grille; 15. Outer enclosure; 151. Second side vent grille; 152. Reinforcing rib; 2. Waterproof and breathable membrane; 3. Vent hole cover component; 31. Main hole; 32. Claw; 33. Third side vent grille; 10. Pump housing component; 20. Drive circuit board. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This embodiment provides a waterproof and breathable rear end cover that can be applied to electromechanical equipment (especially electronic water pumps) as a rear cover for the equipment.

[0028] Please see Figures 1-5 The waterproof and breathable rear end cover of this embodiment includes a rear end cover body component 1, a waterproof and breathable membrane 2, and a vent cover component 3.

[0029] The rear end cover body component 1 is a one-piece molded engineering plastic or metal cover-shaped component, used as the structural support base for the waterproof and breathable rear end cover; the vent cover component 3 is a one-piece molded engineering plastic or metal cap-shaped component; the waterproof and breathable membrane 2 includes a non-woven fabric layer and an expanded polytetrafluoroethylene (ePTFE) layer stacked sequentially. The non-woven fabric layer is made of polypropylene (PP) fiber or polyester (PET) fiber, and the expanded polytetrafluoroethylene (ePTFE) layer is made of expanded polytetrafluoroethylene (ePTFE). Both the non-woven fabric layer and the expanded polytetrafluoroethylene (ePTFE) layer are porous and have a certain degree of extensibility, giving them waterproof and breathable properties, and a certain degree of resistance to breakage. After the non-woven fabric layer and the expanded polytetrafluoroethylene (ePTFE) layer are stacked sequentially, they are bonded together by hot pressing to form the waterproof and breathable membrane 2.

[0030] A vent hole 11 is provided at the rear cover body component 1. In this embodiment, the vent hole 11 is integrally formed with the rear cover body component 1, located in the center of the rear cover body component 1, and axially penetrates the rear cover body component 1.

[0031] A waterproof and breathable membrane 2 is disposed on the inner side of the rear cover body component 1 and covers the vent holes 11 of the rear cover body component 1.

[0032] The vent cover component 3 is disposed on the outside of the rear cover body component 1 to form a venting channel communicating with the vent 11 on the outside of the rear cover body component 1.

[0033] Specifically, a waterproof and breathable membrane fixing plane 12 is formed on the inner side of the rear cover body component 1, around the vent hole 11. In fact, it is only necessary to form a flat area around the vent hole 11 of the rear cover body component 1 to obtain the waterproof and breathable membrane fixing plane 12. The waterproof and breathable membrane 2 is fixed to the waterproof and breathable membrane fixing plane 12 of the rear cover body component 1 by ultrasonic welding, hot pressing or pasting. In this embodiment, both the rear cover body component 1 and the vent hole cover component 3 are made of engineering plastic. The expanded polytetrafluoroethylene layer of the waterproof and breathable membrane 2 is pasted and fixed to the waterproof and breathable membrane fixing plane 12 of the rear cover body component 1 by ultrasonic welding.

[0034] Furthermore, the inner side of the rear cover body component 1 is pulled up around the waterproof and breathable membrane fixing plane 12 to form an inner enclosure 13. In fact, the inner enclosure 13 is integrally formed with the rear cover body component 1. The inner enclosure 13 is provided to protect the side of the waterproof and breathable membrane 2 on the one hand, and to provide a positioning structure for the assembly of the waterproof and breathable membrane 2 on the other hand.

[0035] Specifically, the outer side of the rear cover body component 1 is raised at the vent hole 11 to form a vent cap 14. In fact, this vent cap 14 is a cap-shaped structure, integrally formed with the rear cover body component 1, and protrudes outward from the outer surface of the rear cover body component 1. The vent cap 14 of the rear cover body component 1 has a first side vent grille 141 formed on its side. In fact, this first side vent grille 141 is an integrally formed grille-shaped structure on the side of the vent cap 14. The outer side of the rear cover body component 1 is raised around the vent cap 14 to form an outer perimeter wall 15. In fact, this outer perimeter wall 15 is an annular wall-shaped structure, integrally formed with the rear cover body component 1, and protrudes outward from the outer surface of the rear cover body component 1. The outer perimeter wall 15 of the rear cover body component 1… The second side vent grille 151 is formed on its side. In fact, the second side vent grille 151 is an integrally formed grille structure on the side of the outer wall 15. The vent cover member 3 has a third side vent grille 33 formed on its side. In fact, the third side vent grille 33 is an integrally formed grille structure on the side of the vent cover member 3. The vent cover member 3 is fixed to the vent cap 14 of the rear cover body member 1. The first side vent grille 141 of the vent cap 14, the second side vent grille 151 of the outer wall 15, and the third side vent grille 33 of the vent cover member 3 are interconnected to form a ventilation channel. It can be understood that the side of the vent cap 14, the side of the outer wall 15, and the side of the vent cover member 3 have a certain radial gap to form a ventilation channel.

[0036] More specifically, the top of the vent cover component 3 is provided with a main hole 31, and a latch 32 is formed on the inner side of the main hole 31. The main hole 31 is a hole-shaped structure feature integrally formed on the top of the vent cover component 3, and the latch 32 is a claw-shaped structure feature integrally formed on the vent cover component 3. The latch 32 of the vent cover component 3 latches onto the top surface of the vent cap 14 of the rear cover body component 1 from the first side vent grille 141, so as to fix the vent cover component 3 to the vent cap 14.

[0037] Furthermore, the first side vent grille 141 of the vent cap 14, the second side vent grille 151 of the outer wall 15, and the third side vent grille 33 of the vent hole cover component 3 are offset from each other in the radial direction; in this way, a tortuous venting channel is obtained. On the one hand, the vent hole cover component 3, the outer wall 15, and the vent cap 14 provide mechanical protection for the waterproof and breathable membrane 2, thereby preventing the waterproof and breathable membrane 2 from being subjected to external mechanical impact. On the other hand, the tortuous venting channel makes it difficult for external spray water to penetrate into the vent hole 11, thereby preventing the waterproof and breathable membrane 2 from being directly eroded by water.

[0038] Please refer to the following: Figure 5 Furthermore, if the distance between the latch 32 of the vent cover component 3 and the upper end face of the rear cover body component 1 is h, then h ≥ 2 mm. With this configuration, a sufficient gap is left between the latch 32 of the vent cover component 3 and the upper end face of the rear cover body component 1, which can ensure the air permeability of the vent 11.

[0039] Please refer to the following: Figure 5 Furthermore, in the rear cover body component 1, the outer diameter of the vent cap 14 is D1, and the inner diameter of the outer perimeter wall 15 is D2, so D2:D1 = 1.2~1.4; with this configuration, sufficient radial gap is left for the side of the vent cap 14 and the side of the outer perimeter wall 15, which can ensure the breathability of the vent cap 14.

[0040] Furthermore, reinforcing ribs 152 are provided at the outer perimeter wall 15 of the rear cover body component 1 to improve the mechanical strength of the outer perimeter wall 15.

[0041] Please see Figure 6 This embodiment also provides an electronic water pump, which includes the above-mentioned waterproof and breathable rear end cover.

[0042] The rear cover body component 1 of the waterproof and breathable rear cover is fixed to the pump housing component 10 of the electronic water pump by screws to cover the drive circuit board 20 of the electronic water pump.

[0043] When water vapor enters the vent 11 from the outside of the waterproof and breathable rear end cover, it will be blocked by the waterproof and breathable membrane 2. However, air from both the inside and outside of the waterproof and breathable rear end cover can pass through the waterproof and breathable membrane 2 and enter and exit the vent 11. This allows the electronic water pump (or other electromechanical equipment using this waterproof and breathable rear end cover) to prevent water vapor from entering the pump housing component 10 (or the housing of other electromechanical equipment). This keeps the inside of the pump housing component 10 and the drive circuit board 20 dry and prevents condensation. It also allows the inside and outside of the pump housing component 10 to breathe, avoiding excessive air pressure inside the pump housing component 10 due to heat generation of the drive circuit board 20.

[0044] In this embodiment, a waterproof and breathable rear end cover and an electronic water pump using it are provided. The waterproof and breathable membrane 2 is disposed on the inner side of the rear end cover body component 1 and covers the vent 11 of the rear end cover body component 1. This allows the electronic water pump to prevent water vapor from entering the pump housing component 10, thereby keeping the inside of the pump housing component 10 and the drive circuit board 20 dry and preventing condensation. At the same time, it allows air to pass through the inside and outside of the pump housing component 10, avoiding excessive air pressure inside the pump housing component 10 due to heat generation of the drive circuit board 20. This achieves the waterproof and breathable functions of the electronic water pump, optimizes the gas exchange efficiency of the electronic water pump, enhances the structural protection of the electronic water pump, and improves the reliability and durability of the electronic water pump.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof and breathable rear end cap, characterized in that, This includes the rear cover body component, the waterproof and breathable membrane, and the vent cover component; The rear cover body component is provided with a ventilation hole; The waterproof and breathable membrane is disposed on the inner side of the rear end cover body component and covers the vent holes of the rear end cover body component. The vent cover component is disposed on the outside of the rear cover body component to form a venting channel communicating with the vent on the outside of the rear cover body component.

2. The waterproof and breathable rear end cap according to claim 1, characterized in that, On the inner side of the rear cover body component, a waterproof and breathable membrane fixing plane is formed around the vent hole. The waterproof and breathable membrane is fixed to the waterproof and breathable membrane fixing plane of the rear cover body component by ultrasonic welding, hot pressing or bonding.

3. The waterproof and breathable rear end cap according to claim 2, characterized in that, The inner side of the rear cover body component is pulled up from the periphery of the waterproof and breathable membrane fixing plane to form an inner enclosure.

4. The waterproof and breathable rear end cap according to any one of claims 1-3, characterized in that, The outer side of the rear cover body component is pulled up at the vent hole to form a vent cap; The vent cap of the rear cover body component has a first side vent grille formed on its side. The outer side of the rear cover body component is pulled up around the vent cap to form an outer perimeter wall; The outer perimeter of the rear cover body component has a second side ventilation grille formed on its side. The vent cover component has a third vent grille formed on its side. The vent cap component is fixed to the vent cap of the rear cover body component; The first side ventilation grille of the ventilation cap, the second side ventilation grille of the outer perimeter wall, and the third side ventilation grille of the ventilation hole cover component are interconnected to form the ventilation channel.

5. The waterproof and breathable rear end cap according to claim 4, characterized in that, The top of the vent cover component has a main hole, and a latch is formed on the inner side of the main hole. The latch of the vent cover component engages with the top surface of the vent cap of the rear cover body component from the first side vent grille to fix the vent cover component at the vent cap.

6. The waterproof and breathable rear end cap according to claim 4 or 5, characterized in that, The first side vent grille of the vent cap, the second side vent grille of the outer perimeter wall, and the third side vent grille of the vent cover component are offset from each other in the radial direction.

7. The waterproof and breathable rear end cap according to claim 5, characterized in that, The distance between the latch of the vent cover component and the upper end face of the rear cover body component is h; Therefore, h ≥ 2mm.

8. The waterproof and breathable rear end cap according to claim 4 or 5, characterized in that, In the rear end cover body component, the outer diameter of the vent cap is D1, and the inner diameter of the outer perimeter wall is D2; Then we have: D2:D1 = 1.2 to 1.

4.

9. The waterproof and breathable rear end cap according to claim 4 or 5, characterized in that, The outer perimeter of the rear cover body component is provided with reinforcing ribs.

10. An electronic water pump, characterized in that, Includes the waterproof and breathable rear end cap as described in any one of claims 1-9.

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