A breathing pressure valve

Abstract

The invention discloses a breathing pressure valve, comprising a base, a dustproof nut, a spring seat and a steel ball. One end of the base is a fixing part, and the other end is a connecting part. A connecting inner cavity is axially provided on the end face of the fixing part, an internal thread is provided on the side wall of the connecting inner cavity, and a through hole extending to the end face of the connecting part is provided on the end face wall, and an external thread is provided on the connecting part. A single-opening inner cavity is axially provided on the dustproof nut, and an internal thread is provided on its inner wall. A first air vent connecting the outside world and its inner cavity is provided on the dustproof nut, a single-opening inner cavity is axially provided on the spring seat, and an external thread is provided on its surface. A second air vent connecting the outside world and its inner cavity is provided on the spring seat, and the steel ball is provided in the inner cavity of the spring seat, and a pressure spring is provided in the inner cavity of the spring seat, the diameter of the steel ball is larger than the aperture of the through hole, the spring seat is connected to the base with its opening facing the base, and the steel ball forms a spherical seal on the through hole under the action of the pressure spring.

Description

Technical Field

[0001] The invention relates to the field of motor manufacturing, and in particular to a breathing pressure valve used for ventilation inside and outside the motor and preventing water immersion. Background Art

[0002] The inner cavity of the motor is generally a closed or highly sealed structure, especially in harsh working conditions, where the sealing requirements are higher. However, the motor will generate heat when it is working continuously. When the inner cavity is sealed, the internal gas will expand, and the internal pressure will increase, causing the body to rupture. In extreme cases, the high temperature will cause the motor to burn out. To avoid the above situation, a breathable structure needs to be designed for the motor to adjust its inner cavity pressure, but its waterproof sealing performance needs to be guaranteed.

[0003] In the prior art, there is a design of setting an electric control valve on the motor, which monitors parameters such as temperature and pressure by cooperating with sensors. Once the detection value is abnormal, the valve is controlled to open to achieve the purpose of pressure relief. When the detection value is normal, the valve is controlled to reset and close. This structural system is relatively complex, has high requirements on sensor sensitivity, high failure rate, poor anti-immersion ability, and a large degree of modification to the motor structure, and insufficient adaptability. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a breathing pressure valve that can be easily integrated into a motor to achieve the purpose of automatically adjusting the pressure in the motor cavity while effectively preventing water immersion.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A breathing pressure valve comprises a base, a dustproof nut, a spring seat and a steel ball, one end of the base is a fixing part, and the other end is a connecting part, a connecting inner cavity is axially opened on the end surface of the fixing part, an internal thread is arranged on the side wall of the connecting inner cavity, and a through hole extending to the end surface of the connecting part is arranged on the end surface wall, an external thread is arranged on the connecting part, a single-opening inner cavity is axially opened on the dustproof nut, an internal thread matching the external thread of the base is arranged on its inner wall, a first air vent connecting the outside world and its inner cavity is opened on the dustproof nut, a single-opening inner cavity is axially opened on the spring seat, an external thread matching the internal thread of the base is arranged on its surface, a second air vent connecting the outside world and its inner cavity is opened on the spring seat, the steel ball is arranged in the inner cavity of the spring seat, and a pressure spring acting on the steel ball and pushing it outward is also arranged in the inner cavity of the spring seat, the diameter of the steel ball is larger than the aperture of the through hole, the spring seat opening is connected to the base with it, and the steel ball forms a spherical seal on the through hole under the action of the pressure spring.

[0007] Furthermore, the second air hole is located on the side of the spring seat, and an expansion hole is provided at the end connecting the inner cavity to the fixing portion, so that an air gap exists between the base and the spring seat, and the second air hole is connected to the air gap.

[0008] Furthermore, a third air hole is provided on the fixing portion, and the third air hole is communicated with the air gap.

[0009] Furthermore, a rotating part is provided on the spring seat, and the elastic force of the pressure spring is adjusted by rotating the spring seat.

[0010] Furthermore, a sealing ring is sandwiched between the steel ball and the end surface wall connected to the inner cavity.

[0011] Furthermore, the first air vent is located on a side surface of the dustproof nut.

[0012] Furthermore, the fixing portion protrudes from the surface of the connecting portion, and the fixing portion and the dustproof nut form a clamp to act on both inner and outer sides of the mounting member.

[0013] Further, the breathing pressure valves are used in pairs and are installed oppositely.

[0014] In summary, the beneficial effect of the present invention is that, compared with the prior art, the breathing pressure valve has a simple structure and an ingenious principle. It adopts a pure mechanical structure plus a pressure control principle. It only needs to be installed in pairs and oppositely on the motor housing to achieve the function of one for inhalation and one for exhaustion to automatically adjust the air pressure in the inner cavity. There is no need to change the original structure of the motor. Only two installation ports need to be opened on the motor housing. In addition, the valve body structure has a strong ability to prevent water immersion, and in a sealed state, even if the inner cavity of the motor catches fire, it can cause the inner cavity to be deprived of oxygen in a short time and then automatically extinguish the open flame, thereby achieving waterproof and fireproof functions and achieving a functional breakthrough in the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a breathing pressure valve provided by an embodiment of the present invention;

[0016] Figure 2 is an exploded view of a breathing pressure valve provided by an embodiment of the present invention;

[0017] Figure 3 It is a cross-sectional schematic diagram of a breathing pressure valve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0019] See also Figures 1 to 3As shown, this embodiment provides a breathing pressure valve, which is suitable for various motors such as automotive motors, engineering machinery motors, etc. Taking the engine starting motor as an example, during installation, two breathing pressure valves are used in pairs and installed oppositely. Two installation ports are opened on the motor housing, and it can be installed at any suitable position of the motor housing to achieve the function of automatically adjusting the pressure with each breath.

[0020] The breathing pressure valve comprises a base 1, a dustproof nut 2, a spring seat 3 and a steel ball 4.

[0021] One end of the base 1 is a fixing portion 11, and the other end is a connecting portion 12. A connecting inner cavity 13 is axially provided on the end face of the fixing portion 11, an internal thread is provided on the side wall of the connecting inner cavity 13, and a through hole 14 extending to the end face of the connecting portion 12 is provided on the end face wall, and an external thread is provided on the connecting portion 12.

[0022] The dust nut 2 has a single-opening inner cavity axially formed thereon, and an inner wall thereof is provided with an inner thread that matches the outer thread of the base 1 . The dust nut 2 has a first air vent 21 connected to the outside world and its inner cavity, and the first air vent 21 is located on the side of the dust nut 2 .

[0023] A single-opening inner cavity is provided in the axial direction on the spring seat 3, and an outer thread matching the inner thread of the base 1 is provided on the surface thereof. A second air hole 31 connecting the outside with its inner cavity is provided on the spring seat 3, and the second air hole 31 is located on the side of the spring seat 3. An expansion hole is provided at the end connecting the inner cavity 13 to the fixing portion 11, so that an air gap 16 exists between the base 1 and the spring seat 3, and the second air hole 31 is connected to the air gap 16. A third air hole 15 is provided on the fixing portion 11, and the third air hole 15 is connected to the air gap 16.

[0024] The steel ball 4 is arranged in the inner cavity of the spring seat 3, and a pressure spring 5 is also arranged in the inner cavity of the spring seat 3 to act on the steel ball 4 and push it outward. The diameter of the steel ball 4 is larger than the aperture of the through hole 14. The spring seat 3 is connected to the base 1 with its opening facing the base 1. The steel ball 4 forms a spherical seal on the through hole 14 under the action of the pressure spring 5. A sealing ring 6 is also sandwiched between the steel ball 4 and the end wall of the inner cavity 13 to improve the sealing performance. A rotating part 32 is arranged on the spring seat 3, and the elastic force of the pressure spring 5 is adjusted by rotating the spring seat 3, thereby setting the balanced air pressure.

[0025] The fixing portion 11 protrudes from the surface of the connecting portion 12 , and the fixing portion 11 and the dustproof nut 2 form a clamping force to act on both the inner and outer sides of the motor housing.

[0026] In summary, the above-mentioned breathing pressure valve has a simple structure and an ingenious principle. It adopts a pure mechanical structure plus a pressure control principle. It only needs to be installed in pairs and oppositely on the motor housing to achieve the function of one inhalation and one exhaustion to automatically adjust the air pressure in the inner cavity. There is no need to change the original structure of the motor. Only two installation ports need to be opened on the motor housing. In addition, the valve body structure has a strong ability to prevent water immersion. In a sealed state, even if a fire occurs in the inner cavity of the motor, it can cause the inner cavity to be deprived of oxygen in a short time and then automatically extinguish the open flame, thereby achieving waterproof and fireproof functions and achieving a functional breakthrough in the motor.

[0027] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above examples. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A breathing pressure valve, characterized in that: Including base, dustproof nut, spring seat and steel ball, One end of the base is a fixing part, and the other end is a connecting part. A connecting inner cavity is provided on the end surface of the fixing part in the axial direction. An internal thread is provided on the side wall of the connecting inner cavity, and a through hole extending to the end surface of the connecting part is provided on the end surface wall. An external thread is provided on the connecting part. The dustproof nut is provided with a single-opening inner cavity along the axial direction, and an inner thread matching the outer thread of the base is provided on the inner wall thereof. The dustproof nut is provided with a first air vent connecting the outside with the inner cavity. The spring seat is provided with a single opening inner cavity along the axial direction, and its surface is provided with an outer thread matching with the inner thread of the base, and the spring seat is provided with a second air vent connecting the outside and its inner cavity. The steel ball is arranged in the inner cavity of the spring seat, and a pressure spring is also arranged in the inner cavity of the spring seat to act on the steel ball and push it outward, the diameter of the steel ball is larger than the aperture of the through hole, the spring seat opening is connected to the base, and the steel ball is acted upon by the pressure spring to form a spherical seal on the through hole; The second air vent is located on the side of the spring seat, and the end of the connecting inner cavity and the fixing portion is provided with an expansion hole, so that there is an air vent gap between the base and the spring seat, and the second air vent is connected to the air vent gap; The fixing portion is provided with a third air hole, and the third air hole is communicated with the air gap; The fixing portion protrudes from the surface of the connecting portion, and the fixing portion and the dustproof nut form a clamp to act on both the inner and outer sides of the mounting member; The breathing pressure valves are used in pairs and are installed oppositely; The first air vent is located on a side surface of the dustproof nut.

2. The breathing pressure valve according to claim 1, characterized in that: The spring seat is provided with a rotating part, and the elastic force of the pressure spring is adjusted by rotating the spring seat.

3. The breathing pressure valve according to claim 1, characterized in that: A sealing ring is sandwiched between the steel ball and the end surface wall of the connecting inner cavity.

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