阅读说明：本技术 一种低压断气阀 (Low-pressure air-cut-off valve ) 是由 王培� 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种低压断气阀,在阀体中且在进气通道的内端开设有中心盲孔,中心盲孔中滑动设置有柱塞；柱塞的内端与中心盲孔的底部之间的空间为第一反压腔且在其中设置有柱塞回位弹簧；柱塞的轴向外端开设有第二气道,第二气道的出气口开设在柱塞的柱身上；中心盲孔一侧的阀体中开设有第一气道,其另一侧的阀体中开设有反压气道；第一气道的进气口与中心盲孔相连通,第一气道的出气口与出气通道相连通；反压气道的进气口与进气通道相连通,反压气道的出气口与第二反压腔相连通,第二反压腔与第一反压腔相连通；当气路气压因其它部件泄漏而低到调节值时本发明自行切断气路,保证车载储气罐内的压力,并在车再次启动压力回升时迅速打开气路。(The invention discloses a low-pressure air-break valve, wherein a central blind hole is formed in a valve body and at the inner end of an air inlet channel, and a plunger is arranged in the central blind hole in a sliding manner; a space between the inner end of the plunger and the bottom of the central blind hole is a first back pressure cavity, and a plunger return spring is arranged in the first back pressure cavity; a second air passage is formed at the axial outer end of the plunger, and an air outlet of the second air passage is formed in the column body of the plunger; a first air passage is arranged in the valve body at one side of the central blind hole, and a back pressure air passage is arranged in the valve body at the other side of the central blind hole; the air inlet of the first air passage is communicated with the central blind hole, and the air outlet of the first air passage is communicated with the air outlet channel; the air inlet of the back pressure air passage is communicated with the air inlet channel, the air outlet of the back pressure air passage is communicated with the second back pressure cavity, and the second back pressure cavity is communicated with the first back pressure cavity; when the air pressure of the air path is reduced to an adjusting value due to the leakage of other parts, the air path is automatically cut off, the pressure in the vehicle-mounted air storage tank is ensured, and the air path is quickly opened when the vehicle starts to return to the pressure again.)

1. A low-pressure air-cut-off valve comprises a valve body (2); an air inlet channel (17) and an air outlet channel (18) are respectively arranged at two axial ends of the valve body (2), an air inlet joint (1) is arranged on an air inlet of the air inlet channel (17), and an air outlet joint (10) is arranged on an air outlet of the air outlet channel (18); the method is characterized in that: a central blind hole (19) extending to the air outlet channel (18) is formed in the valve body (2) and at the inner end of the air inlet channel (17), and a plunger (4) is arranged in the central blind hole (19) in a sliding manner; a space between the inner end of the plunger (4) and the bottom of the central blind hole (19) is a first counter-pressure cavity (14), and a plunger return spring (8) with two ends fixedly connected with the inner end of the plunger (4) and the bottom of the central blind hole (19) is arranged in the first counter-pressure cavity (14); a second air passage (12) is formed in the axial outer end of the plunger (4), and an air outlet of the second air passage (12) is formed in the column body of the plunger (4);

a first air passage (11) is arranged in the valve body (2) at one side of the central blind hole (19), and a back pressure air passage (13) is arranged in the valve body (2) at the other side of the central blind hole; the air inlet of the first air passage (11) is communicated with the central blind hole (19), and the air outlet of the first air passage (11) is communicated with the air outlet channel (18); the air inlet of the back pressure air passage (13) is communicated with the air inlet channel (17), and the air outlet of the back pressure air passage (13) is communicated with a second back pressure cavity (20) arranged in the valve body (2); a back pressure cavity air inlet (15) communicated with the second back pressure cavity (20) and the first back pressure cavity (14) is formed in the inner wall of the central blind hole (19);

a return spring (7) is arranged in the second back pressure cavity (20), one end, close to the back pressure air passage (13), of the return spring (7) is fixedly connected with a one-way sealing plug (6), and one end, far away from the back pressure air passage (13), of the return spring (7) is fixedly arranged.

2. The low pressure air shut-off valve as defined in claim 1, wherein: the bottom of the central blind hole (19) is provided with a pressure adjusting hole leading to the air outlet channel (18), and a pressure adjusting nut (16) is arranged in the pressure adjusting hole; one end of the plunger return spring (8) is fixedly connected with the inner end of the pressure adjusting nut (16).

3. The low pressure air shut-off valve as defined in claim 1, wherein: the air inlet of the first air passage (11) is formed in the inner wall of the middle of the central blind hole (19), and an annular air inlet groove is formed in the inner wall of the central blind hole (19) at the air inlet.

4. The low pressure air shut-off valve as defined in claim 1, wherein: the air outlet of the second air passage (12) is formed in the middle upper portion of the column body of the plunger (4), and an annular air outlet groove is formed in the column body of the plunger (4) at the air outlet.

5. The low pressure air shut-off valve as defined in claim 1, wherein: the second counter-pressure cavity (20) is arranged on the valve body (2) at one end of the air inlet channel (17), and a sealing plug (9) is arranged in an outer opening of the second counter-pressure cavity (20).

6. The low pressure air shut-off valve as defined in claim 1, wherein: the central blind hole (19) and the plunger (4) are step-shaped, and the diameters of the outer ends of the central blind hole and the plunger are larger than those of the inner ends of the central blind hole and the plunger.

7. The low pressure air shut-off valve as defined in claim 6, wherein: the outer end of the plunger (4) is provided with an outer sealing ring (3), and the inner end of the plunger (4) is provided with a plurality of inner sealing rings (5).

Technical Field

The invention relates to the technical field of passenger car door control, in particular to a low-pressure air-break valve.

Background

In a bus door air path, because a bus door is driven by an air cylinder, the bus door is connected with the bus door air cylinder by an air pipe from a vehicle-mounted air storage tank, and the air path is connected with air control valves with different functions, if any one of the air control valves fails and leaks, the air pressure of the vehicle-mounted air storage tank can be completely leaked, so that the closing of the bus door is influenced. And a driver needs time to fill the air storage tank with air when starting the vehicle, so that not only is time wasted (5-10 minutes is needed for filling the air storage tank with air), but also the fuel cost is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a low-pressure air-break valve which automatically breaks off an air path when the air pressure of the air path is lowered to an adjusting value due to the leakage of other components, ensures the pressure in a vehicle-mounted air storage tank and quickly opens the air path when the vehicle starts to return to the pressure again.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a low-pressure air-cut-off valve comprises a valve body; an air inlet channel and an air outlet channel are respectively arranged at the two axial ends of the valve body, an air inlet joint is arranged on an air inlet of the air inlet channel, and an air outlet joint is arranged on an air outlet of the air outlet channel; a central blind hole extending to the air outlet channel is formed in the valve body and at the inner end of the air inlet channel, and a plunger is arranged in the central blind hole in a sliding manner; a space between the inner end of the plunger and the bottom of the central blind hole is a first counter-pressure cavity, and a plunger return spring with two ends fixedly connected with the inner end of the plunger and the bottom of the central blind hole is arranged in the first counter-pressure cavity; a second air passage is formed in the axial outer end of the plunger, and an air outlet of the second air passage is formed in the column body of the plunger; a first air passage is arranged in the valve body at one side of the central blind hole, and a back pressure air passage is arranged in the valve body at the other side of the central blind hole; the air inlet of the first air passage is communicated with the central blind hole, and the air outlet of the first air passage is communicated with the air outlet channel; the air inlet of the back pressure air passage is communicated with the air inlet channel, and the air outlet of the back pressure air passage is communicated with a second back pressure cavity arranged in the valve body; a back pressure cavity air inlet communicated with the second back pressure cavity and the first back pressure cavity is formed in the inner wall of the central blind hole;

furthermore, a return spring is arranged in the second back pressure cavity, one end, close to the back pressure air passage, of the return spring is fixedly connected with a one-way sealing plug, and one end, far away from the back pressure air passage, of the return spring is fixedly arranged.

Further, the bottom of the central blind hole is provided with a pressure adjusting hole leading to the air outlet channel, and a pressure adjusting nut is arranged in the pressure adjusting hole; one end of the plunger return spring is fixedly connected with the inner end of the pressure adjusting nut.

Furthermore, the air inlet of the first air passage is formed in the inner wall of the middle of the central blind hole, and an annular air inlet groove is formed in the inner wall of the central blind hole at the air inlet.

Furthermore, the air outlet of the second air passage is formed in the middle upper part of the plunger body of the plunger, and an annular air outlet groove is formed in the plunger body at the air outlet.

Furthermore, the second counter-pressure cavity is arranged on the valve body at one end of the air inlet channel, and a sealing plug is arranged in an outer opening of the second counter-pressure cavity.

Furthermore, the central blind hole and the plunger are step-shaped, and the diameters of the outer ends of the central blind hole and the plunger are larger than the diameters of the inner ends of the central blind hole and the plunger.

Furthermore, an outer sealing ring is arranged on the outer end column body of the plunger, and a plurality of inner sealing rings are arranged on the inner end column body of the plunger.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the invention has the advantages of simple structure, light weight, strong bearing capacity, high reliability, no maintenance and high cost performance. The invention is a mechanical mechanism, has good stability and small error, and is suitable for being used in various environments. The low-pressure air-break valve can adjust the pressure value to 0.6-0.7MPa (the standard pressure for vehicles is 1.0 MPa), and when the air pressure in the air passage is reduced to the adjusted value due to the leakage of other parts, the low-pressure air-break valve can automatically cut off the air passage to ensure the pressure in the vehicle-mounted air storage tank, when the vehicle is restarted, the pressure can quickly rise, and when the pressure exceeds 0.7MPa, the valve can automatically and quickly open.

Drawings

FIG. 1 is a schematic structural view of the present invention in a closed state;

in the figure: 1. air inlet joint, 2, valve body, 3, outer sealing ring, 4, plunger, 5, inner sealing ring, 6, one-way sealing plug, 7, reset spring, 8, plunger return spring, 9, sealing plug, 10, air outlet joint, 11, first air passage, 12, second air passage, 13, back pressure air passage, 14, first back pressure cavity, 15, back pressure cavity air inlet, 16, pressure adjusting nut, 17, air inlet channel, 18, air outlet channel, 19, central blind hole, 20, second back pressure cavity.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a low pressure air-break valve comprises a valve body 2; an air inlet channel 17 and an air outlet channel 18 are respectively arranged at two axial ends of the valve body 2, an air inlet joint 1 is arranged on an air inlet of the air inlet channel 17, and an air outlet joint 10 is arranged on an air outlet of the air outlet channel 18; a central blind hole 19 extending to the air outlet channel 18 is formed in the valve body 2 at the inner end of the air inlet channel 17, and a plunger 4 is slidably arranged in the central blind hole 19; a space between the inner end of the plunger 4 and the bottom of the central blind hole 19 is a first counter-pressure cavity 14, and a plunger return spring 8 with two ends fixedly connected with the inner end of the plunger 4 and the bottom of the central blind hole 19 is arranged in the first counter-pressure cavity 14; a second air passage 12 is formed at the axial outer end of the plunger 4, and an air outlet of the second air passage 12 is formed in the column body of the plunger 4; a first air passage 11 is arranged in the valve body 2 at one side of the central blind hole 19, and a back pressure air passage 13 is arranged in the valve body 2 at the other side; the air inlet of the first air passage 11 is communicated with the central blind hole 19, and the air outlet of the first air passage 11 is communicated with the air outlet channel 18; the air inlet of the back pressure air passage 13 is communicated with the air inlet channel 17, and the air outlet of the back pressure air passage 13 is communicated with a second back pressure cavity 20 arranged in the valve body 2; a back pressure cavity air inlet 15 which is communicated with the second back pressure cavity 20 and the first back pressure cavity 14 is formed in the inner wall of the central blind hole 19; a return spring 7 is arranged in the second back pressure cavity 20, one end of the return spring 7 close to the back pressure air passage 13 is fixedly connected with a one-way sealing plug 6, and one end of the return spring 7 far away from the back pressure air passage 13 is fixedly arranged.

The low-pressure air-break valve can adjust the pressure value to 0.6-0.7MPa (the standard pressure for vehicles is 1.0 MPa), and when the air pressure in the air passage is reduced to the adjustment value due to the leakage of other parts, the low-pressure air-break valve can automatically cut off the air passage to ensure the pressure in the vehicle-mounted air storage tank, when the vehicle is restarted, the pressure can quickly rise, and when the pressure exceeds 0.7MPa, the valve can automatically and quickly open.

The bottom of the central blind hole 19 is provided with a pressure adjusting hole leading to the air outlet channel 18, and a pressure adjusting nut 16 is arranged in the pressure adjusting hole; one end of the plunger return spring 8 is fixedly connected with the inner end of the pressure adjusting nut 16. The pressure value can be conveniently adjusted to 0.6-0.7MPa (the standard pressure for the vehicle is 1.0 MPa) through the pressure adjusting nut 16.

An air inlet of the first air passage 11 is formed in the inner wall of the middle of the central blind hole 19, and an annular air inlet groove is formed in the inner wall of the central blind hole 19 at the air inlet; the air outlet of the second air passage 12 is formed in the middle upper part of the column body of the plunger 4, and an annular air outlet groove is formed in the column body of the plunger 4 at the air outlet. The air inlet groove and the air outlet groove are both beneficial to the communication of the air path between the air inlet connector 1 and the air outlet connector 10.

The central blind bore 19 and the plunger 4 are both stepped and have an outer end diameter greater than an inner end diameter. An outer sealing ring 3 is arranged on the outer end column body of the plunger 4, and a plurality of inner sealing rings 5 are arranged on the inner end column body of the plunger 4. The outer sealing ring 3 and the inner sealing ring 5 are used for preventing air leakage and ensuring effective on-off of an air path. As shown in fig. 1, in the closed state of the air path, an inner seal ring 5 is disposed on the trunk of the plunger 4 between the air outlet of the second air path 12 and the air inlet of the first air path 11, and two inner seal rings 5 are disposed on the trunk of the plunger 4 between the air inlet of the first air path 11 and the first back pressure chamber 14.

The second counter-pressure chamber 20 is opened on the valve body 2 at one end of the air inlet channel 17, and a sealing plug 9 is arranged in the outer opening of the second counter-pressure chamber 20.

The working principle of the invention is as follows: the low-pressure air-break valve is arranged in the air passage of the door of the passenger car. The air pressure is divided into two paths through an air inlet joint 1: when the air pressure entering the air inlet joint 1 acts on the plunger 4, the plunger 4 can compress the plunger return spring 8 to move downwards until the air outlet of the second air passage 12 reaches the air inlet position of the first air passage 11, at the moment, one path of the air pressure enters the first air passage 11 through the second air passage 12 and then comes out of the air outlet joint 10, and meanwhile, the other path of the air pressure entering the air inlet joint 1 acts on the one-way sealing plug 6 in the second counter-pressure cavity 20 through the counter-pressure air passage 13, so that the one-way sealing plug 6 compresses the return spring 7 to open the air outlet of the counter-pressure air passage 13, and then the air pressure enters the first counter-pressure cavity 14 through the counter-pressure cavity air inlet 15. Afterwards, when the pressure at the end of the air outlet joint 10 is reduced (at this time, the air outlet joint 10 is communicated with the air inlet joint 1), the pressure at the end of the air inlet joint 1 is also reduced, and at this time, the pressure acting on the end surface of the plunger 4 is reduced along with the reduction of the air pressure, because the channel entering the first counter-pressure cavity 14 through the counter-pressure air channel 13 is a one-way channel, the pressure at the end of the air inlet joint 1 is reduced without affecting the pressure at the end of the first counter-pressure cavity 14, according to the principle of air pressure balance, when the air pressure is lower than 0.7Mpa (adjustable), the pressure at the end of the first counter-pressure cavity 14 is greater than the pressure at the end of the air inlet joint 1, and the plunger 4 is reset by the elasticity of the plunger return spring 8, so that the air passage. On the contrary, when the pressure at the end of the air inlet joint 1 is greater than 0.7Mpa, the air path between the air inlet joint 1 and the air outlet joint 10 is communicated.