A low pressure cut-off valve

Abstract

The invention discloses a low-pressure air cut-off valve. A central blind hole is arranged in the valve body and at the inner end of the air intake passage, and a plunger is slidably arranged in the central blind hole; the inner end of the plunger is connected to the bottom of the central blind hole The space between them is the first anti-pressure chamber and a plunger return spring is arranged in it; the axially outer end of the plunger is provided with a second air channel, and the air outlet of the second air channel is opened on the body of the plunger; the center The valve body on one side of the blind hole is provided with a first air passage, and the valve body on the other side is provided with a back pressure air passage; the inlet of the first air passage communicates with the central blind hole, and the outlet of the first air passage The air port is connected with the air outlet channel; the air inlet of the back pressure air passage is connected with the air intake passage, the air outlet of the back pressure air passage is connected with the second back pressure chamber, and the second back pressure chamber is connected with the first back pressure chamber; When the air pressure of the gas path is lowered to the adjusted value due to leakage of other components, the present invention automatically cuts off the gas path to ensure the pressure in the vehicle-mounted air storage tank, and quickly opens the gas path when the pressure rises when the vehicle is started again.

Description

technical field [0001] The invention relates to the technical field of passenger car door control, in particular to a low-pressure air cut-off valve. Background technique [0002] In the air circuit of the passenger car door, since the door is driven by the cylinder, the air pipe is used to connect the on-board air storage tank to the door cylinder. There are air control valves with different functions connected to the air circuit. If any of the air control valves appears If a leak occurs in the fault, the air pressure of the on-board air storage tank will be leaked out, which will affect the closing of the car door. And the driver needs time to fill the gas storage tank when starting the car, which not only wastes time (it takes 5-10 minutes to fill the gas storage tank), but also increases fuel costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a low-pressure...

AI Technical Summary

Problems solved by technology

[0002] In the air circuit of the passenger car door, since the door is driven by the cylinder, the air pipe is used to connect the on-board air storage tank to the door cylinder. There are air control valves with different functions connected to the air circuit. If any of the air control valves appears If there is a leak in the fault, the air pressure of the on-board air storage tank will be leaked out, which will affect the closing of the car door

And the driver needs time to fill the gas storage tank when starting the car, which not only wastes time (it takes 5-10 minutes to fill the gas storage tank), but also increases fuel costs

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