CN-115978248-B - Self-pressure-relief one-way valve

CN115978248BCN 115978248 BCN115978248 BCN 115978248BCN-115978248-B

Abstract

The invention discloses a self-pressure-relief one-way valve, which comprises a valve body and a movable valve. The valve body is internally provided with a cavity, the valve body is provided with an input hole and an output hole which are respectively communicated with the cavity, the output hole is communicated with one end of the cavity, and an opening of the output hole is arranged on the output surface. The movable valve is arranged in the cavity and is in sliding connection with the cavity, a spring is arranged between the movable valve and the inner wall of the cavity, and the spring is used for propping the end face of one end of the movable valve against the output face so as to seal the output hole. The end face of the movable valve, which is abutted against the output surface, is a closing surface, the concave of the output surface is matched with the closing surface to form a ring groove, or the concave of the closing surface is matched with the output surface to form a ring groove, and the ring groove is communicated with the input hole. The movable valve is provided with a flow passage communicated with the outside. When the pressure is greater than the first threshold value, the gas pushes the movable valve to move against the resistance of the spring at the ring groove to open the output hole.

Inventors

WANG SHUJIE
WU XUEJIAO
LIU HONGBAO
WEI DONG
XIE HUANGJUN
LI MIAO
ZANG HUI
SHI YUPENG

Assignees

上海宇航系统工程研究所

Dates

Publication Date: 20260512
Application Date: 20221214

Claims (10)

1. A self-venting check valve, comprising: The valve body is internally provided with a cavity, and the valve body is provided with an input hole and an output hole which are respectively communicated with the cavity; The movable valve is arranged in the cavity and is in sliding connection with the cavity, a spring is arranged between the movable valve and the inner wall of the cavity, and the spring is used for propping the end face of one end of the movable valve against the output face so as to seal the output hole; The end face of the movable valve, which is abutted against the output surface, is a closing surface, the concave part of the output surface is matched with the closing surface to form a ring groove or the concave part of the closing surface is matched with the output surface to form a ring groove, and the ring groove is communicated with the input hole; when the pressure applied by the gas to the closing surface is greater than the first threshold value, the gas pushes the movable valve to move at the annular groove against the resistance of the spring to open the output hole.
2. The self-venting check valve of claim 1, wherein a sealing surface is disposed in the cavity, and wherein in an operational state, when a pressure exerted by the gas on the sealing surface is greater than a second threshold, the gas urges the valve to move against the resistance of the spring to a position where the sealing surface seals an opening at one end of the flow passage to seal the flow passage, wherein the second threshold is greater than the first threshold.
3. The self-venting check valve of claim 2 wherein a valve stem is disposed within the cavity and the sealing surface is disposed on the valve stem.
4. The self-pressure-relief one-way valve according to claim 3, wherein one end face of the movable valve in the sliding direction is a closing face, the other end face is matched with the inner wall of the cavity to form a pressure relief area, the valve rod is arranged in the pressure relief area, and a communication hole communicated with the outside is formed in the valve rod; the flow passage is communicated with the input hole and the pressure relief area, the flow passage is communicated with one end of the pressure relief area, and the opening of the flow passage is closed by the closing surface when the pressure exerted by the gas on the closing surface is larger than the second threshold value.
5. The self-venting check valve of claim 4, wherein the valve is configured to cooperate with the surface of the cavity inner wall forming the venting area to form a spring sleeve, and wherein one end of the spring extends into the spring sleeve and contacts the bottom surface of the spring sleeve; The valve rod is arranged in the spring, one end of the valve rod is connected with the inner wall of the cavity, the other end of the valve rod faces the bottom surface of the spring sleeve and is provided with the sealing surface, and the opening at one end of the flow passage, which is communicated with the pressure release area, is formed in the bottom surface of the spring sleeve.
6. The self-pressure-releasing check valve according to claim 4, wherein the output hole and the pressure-releasing area are respectively provided at both ends of the sliding direction of the valve, and the input hole is provided at the peripheral side of the sliding direction of the valve; the sliding connection part of the movable valve and the inner wall of the cavity is provided with a sealing structure to realize sliding sealing, and the sealing structure is arranged on one side, which is close to the pressure relief area, of the input hole.
7. The self-venting check valve of claim 6, wherein the sealing structure is a sealing ring.
8. The self-pressure-relieving one-way valve according to claim 7, wherein the movable valve is provided with a rubber ring groove, and the sealing ring is installed in the rubber ring groove.
9. The self-venting check valve of claim 1 or 6, wherein the valve slides in the direction of its own axis.
10. The self-venting check valve of claim 1 wherein the path of the flow passage is no more than one third of the aperture of the output orifice.

Description

Self-pressure-relief one-way valve Technical Field The invention belongs to the technical field of carrier rockets, and particularly relates to a self-pressure-relief one-way valve. Background The tank air pillow pressure can be relieved through the overflow valve. When the storage tank needs to be depressurized, the overflow valve is opened, the storage tank is depressurized, and when the storage tank does not need to be depressurized, the overflow valve is closed. The ground air distribution table is communicated with the overflow valve, and a one-way valve is arranged on the communicated pipeline. When the overflow valve needs to be opened, the ground air distribution table supplies air to enable the one-way valve to be opened, air is forced to enter the overflow valve to enable the overflow valve to be opened, the storage tank is decompressed, when the overflow valve needs to be closed, the ground air distribution table stops supplying air, air pressure in the pipeline is reduced, the one-way valve is closed, and the overflow valve is also closed. However, when the ground gas distribution table is closed, gas remains in a pipeline between the ground gas distribution table and the one-way valve, when other pressure in the pipeline is increased due to environmental changes, the one-way valve can be opened by the increased air pressure, and then the overflow valve is abnormally opened. Disclosure of Invention In order to solve the above problems, the present invention aims to provide a self-pressure-releasing check valve. The technical scheme of the invention is as follows: a self-venting check valve comprising: The valve body is internally provided with a cavity, and the valve body is provided with an input hole and an output hole which are respectively communicated with the cavity; The movable valve is arranged in the cavity and is in sliding connection with the cavity, a spring is arranged between the movable valve and the inner wall of the cavity, and the spring is used for propping the end face of one end of the movable valve against the output face so as to seal the output hole; The end face of the movable valve, which is abutted against the output surface, is a closing surface, the concave part of the output surface is matched with the closing surface to form a ring groove or the concave part of the closing surface is matched with the output surface to form a ring groove, and the ring groove is communicated with the input hole; when the pressure applied by the gas to the closing surface is greater than the first threshold value, the gas pushes the movable valve to move at the annular groove against the resistance of the spring to open the output hole. When the pressure applied by the gas to the closing surface is greater than a second threshold value in a working state, the gas pushes the movable valve to overcome the resistance of the spring and move to a position where the closing surface closes an opening at one end of the flow channel so as to close the flow channel, wherein the second threshold value is greater than the first threshold value. The self-pressure-relief one-way valve provided by one embodiment is characterized in that a valve rod is arranged in the cavity, and the sealing surface is arranged on the valve rod. The self-pressure-relief one-way valve provided by one embodiment is characterized in that one end face of the movable valve in the sliding direction is a closing face, the other end face of the movable valve is matched with the inner wall of the cavity to form a pressure relief area, the valve rod is arranged in the pressure relief area, and a communication hole communicated with the outside is formed in the valve rod; the flow passage is communicated with the input hole and the pressure relief area, the flow passage is communicated with one end of the pressure relief area, and the opening of the flow passage is closed by the closing surface when the pressure exerted by the gas on the closing surface is larger than the second threshold value. The self-pressure-relief one-way valve provided by one embodiment is used for being matched with the surface of the inner wall of the cavity to form the pressure relief area to form a spring sleeve, and one end of the spring extends into the spring sleeve and is contacted with the bottom surface of the spring sleeve; The valve rod is arranged in the spring, one end of the valve rod is connected with the inner wall of the cavity, the other end of the valve rod faces the bottom surface of the spring sleeve and is provided with the sealing surface, and the opening at one end of the flow passage, which is communicated with the pressure release area, is formed in the bottom surface of the spring sleeve. The self-pressure-relief check valve provided by one embodiment, wherein the output hole and the pressure relief area are respectively arranged at two ends of the sliding direction of the movable valve, and the input hole is arranged at the p