Self-relieving one-way valve

Abstract

The application discloses a self-pressure-relief check valve, which comprises a valve body and a valve core. 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 communicated with the cavity respectively. The output hole is communicated with one end of the cavity, and the opening of the output hole is arranged on an output surface. The valve core is arranged in the cavity and is slidably connected with the cavity. A spring is arranged between the valve core and the inner wall of the cavity, and the spring is used for abutting the end surface of one end of the valve core to the output surface to close the output hole. The end surface of the valve core abutting the output surface is a closing surface. The output surface is partially concave, and the closing surface and the output surface are matched to form an annular groove. The annular groove is communicated with the input hole. A flow channel communicated with the outside is arranged on the valve core. In the working state, when the pressure of the gas on the closing surface at the annular groove is not greater than a first threshold value, the gas leaves the cavity from the flow channel; when the pressure is greater than the first threshold value, the gas at the annular groove pushes the valve core to move to open the output hole by overcoming the resistance of the spring.

Description

Technical Field

[0001] This invention belongs to the field of launch vehicle technology, and particularly relates to a self-relieving one-way valve. Background Technology

[0002] The pressure in the storage tank's air cushion can be released through an overflow valve. When the storage tank needs depressurization, the overflow valve opens, allowing the tank to release pressure; when depressurization is not required, the overflow valve closes. A ground-based gas distribution platform is connected to the overflow valve, and a check valve is installed on the connecting pipeline. When the overflow valve needs to open, the ground-based gas distribution platform supplies gas, causing the check valve to open and forcing gas into the overflow valve, thus depressurizing the storage tank. Conversely, when the overflow valve needs to close, the ground-based gas distribution platform stops supplying gas, reducing the gas pressure in the pipeline, closing the check valve, and consequently, the overflow valve itself.

[0003] However, when the ground gas distribution platform is closed, there is still residual gas in the pipeline between the ground gas distribution platform and the check valve. When environmental changes cause other pressures in this pipeline to rise, the increased gas pressure will open the check valve, which in turn will cause the safety relief valve to open abnormally. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a self-relieving check valve.

[0005] The technical solution of this invention is as follows:

[0006] A self-relieving check valve, comprising:

[0007] The valve body has an internal cavity, and the valve body has an input hole and an output hole that communicate with the cavity respectively; the output hole communicates with one end of the cavity, and its opening is located on the output surface;

[0008] A valve is disposed in the cavity and slidably connected to the cavity. A spring is provided between the valve and the inner wall of the cavity. The spring is used to press the end face of one end of the valve against the output surface to close the output hole.

[0009] The end face of the valve that abuts against the output surface is the closing surface. The output surface is partially concave and cooperates with the closing surface to form an annular groove, or the closing surface is partially concave and cooperates with the output surface to form an annular groove. The annular groove communicates with the input hole. The valve is provided with a flow channel communicating with the outside.

[0010] In operation, when the pressure exerted by the gas entering from the input port on the closing surface at the annular groove is not greater than a first threshold, the gas leaves the cavity from the flow channel; when the pressure exerted by the gas on the closing surface is greater than the first threshold, the gas pushes the valve at the annular groove to overcome the resistance of the spring and move to open the output port.

[0011] One embodiment of the self-relieving check valve has a sealing surface in the cavity; in the working state, when the pressure applied by the gas to the sealing surface is greater than a second threshold, the gas pushes the valve to overcome the resistance of the spring and move to the position where the sealing surface closes one end opening of the flow channel, so as to close the flow channel, wherein the second threshold is greater than the first threshold.

[0012] One embodiment of the self-relieving check valve has a valve stem provided in the cavity, and the sealing surface is provided on the valve stem.

[0013] One embodiment of the self-relieving check valve has a valve with one end face in the sliding direction as a closing face and the other end face cooperating with the inner wall of the cavity to form a pressure relief area. The valve stem is located in the pressure relief area and has a connecting hole for communicating with the outside.

[0014] The flow channel connects the input port and the pressure relief zone, and one end of the flow channel connects to the pressure relief zone. Its opening is closed by the sealing surface when the pressure exerted by the gas on the closing surface is greater than the second threshold.

[0015] One embodiment provides a self-relieving one-way valve, wherein the valve is used to form a spring sleeve on the surface of the inner wall of the cavity that forms the pressure relief zone, and one end of the spring extends into the spring sleeve and contacts the bottom surface of the spring sleeve;

[0016] The valve stem is located inside the spring, with one end connected to the inner wall of the cavity and the other end facing the bottom surface of the spring sleeve and having the sealing surface. The opening of the flow channel at one end, which connects to the pressure relief area, is located on the bottom surface of the spring sleeve.

[0017] In one embodiment, a self-relieving check valve is provided, wherein the output port and the pressure relief zone are respectively located at both ends of the valve's sliding direction, and the input port is located on the periphery of the valve's sliding direction.

[0018] The sliding connection between the valve and the inner wall of the cavity is provided with a sealing structure to achieve sliding sealing, and the sealing structure is located on the side relative to the input port and closer to the pressure relief area.

[0019] One embodiment of the self-relieving check valve has a sealing structure of a sealing ring.

[0020] One embodiment of the self-relieving check valve has a rubber ring groove on the valve, and the sealing ring is installed in the rubber ring groove.

[0021] One embodiment provides a self-relieving check valve, wherein the valve slides along its own axial direction.

[0022] In one embodiment, a self-relieving check valve is provided, wherein the diameter of the flow channel is not greater than one-third of the diameter of the output orifice.

[0023] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0024] The self-relieving check valve provided by this invention is equipped with a flow channel. When the main channel (input port - output port) of the check valve is closed, the pressure relief channel (input port - flow channel - outside) is in the open state. Therefore, when the ground gas distribution station stops supplying gas, the gas in the pipeline between the ground gas distribution station and the check valve can be discharged through the flow channel. Thus, no matter how the environment changes, the check valve will not open after the ground gas distribution station stops, and the safety relief valve will not open abnormally. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0026] Figure 1 This is a schematic diagram of the structure of a self-relieving check valve according to the present invention;

[0027] Figure 2 This is a partially enlarged schematic diagram of a self-relieving check valve according to the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Valve body; 11: Inlet port; 12: Outlet port; 13: Pressure relief zone; 14: Stop fillet; 2: Live valve; 21: Flow channel; 3: Valve stem; 4: Spring; 5: Sealing ring. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0032] See Figure 1 and Figure 2This embodiment provides a self-relieving one-way valve, including a valve body 1 and a valve 2. The valve body 1 has an internal cavity, and an input port 11 and an output port 12 respectively communicating with the cavity; the output port 12 communicates with one end of the cavity, and its opening is located on the output surface. The valve 2 is located in the cavity and slidably connected to the cavity. A spring 4 is provided between the valve 2 and the inner wall of the cavity. The spring 4 is used to press the end face of one end of the valve 2 against the output surface to close the output port 12.

[0033] The end face of the valve 2 that abuts against the output surface is the closing surface. The output surface is partially concave and mates with the closing surface to form an annular groove, or the closing surface is partially concave and mates with the output surface to form an annular groove. The annular groove communicates with the inlet port 11. The valve 2 is provided with a flow channel 21 that communicates with the outside.

[0034] In operation, when the pressure exerted by the gas on the closing surface at the annular groove is not greater than the first threshold, the gas leaves the cavity from the flow channel 21; when the pressure is greater than the first threshold, the gas pushes the valve 2 at the annular groove to overcome the resistance of the spring 4 and move to open the output port 12.

[0035] The structure of this embodiment will now be described.

[0036] The inlet 11 of the self-relieving check valve is connected to the ground gas distribution platform through the gas supply pipeline, and the outlet 12 is connected to the safety relief valve. The valve 2 is slidably connected to the cavity of the valve body 1 along its own axis. One end of the valve 2 along the axis is the outlet 12, and the end face of the other end cooperates with the inner wall of the cavity to form a pressure relief zone 13; the inlet 11 is located on the periphery of the valve 2 in the sliding direction.

[0037] The cavity has a closed surface. During operation, when the pressure exerted by the gas on the closed surface exceeds a second threshold, the gas pushes the valve 2 to overcome the resistance of the spring 4 and move it to the position where one end of the flow channel 21 is closed. At this time, the flow channel 21 is sealed. The second threshold is greater than the first threshold. Specifically, gas enters the cavity through the inlet port 11. When the pressure exerted by the gas on the closed surface is not greater than the first threshold, the outlet port 12 closes, the flow channel 21 opens, and the gas leaves the cavity through the flow channel 21. When the pressure is greater than the first threshold but not greater than the second threshold, the outlet port 12 opens, the flow channel 21 opens, and the gas leaves the cavity through both the outlet port 12 and the flow channel 21. When the pressure is greater than the second threshold, the outlet port 12 opens, the flow channel 21 closes, and the gas leaves the cavity through the outlet port 12.

[0038] The valve 2 is fitted with a spring sleeve formed on the surface of the inner wall of the cavity to create a pressure relief zone 13. One end of the spring 4 extends into the spring sleeve and contacts the bottom surface of the spring sleeve, while the other end abuts against the inner wall of the cavity. A valve stem 3 is provided within the pressure relief zone 13. The axial direction of the valve stem 3 is the same as that of the valve 2. The valve stem 3 is located inside the spring 4, with one end connected to the inner wall of the cavity and the other end having a closing surface. Furthermore, a connecting hole for communication with the outside is provided on the valve stem 3. A flow channel 21 is provided on the valve 2, with one end located on the side wall of the valve 2 and communicating with the input hole 11; the other end is located on the bottom surface of the spring sleeve and communicating with the pressure relief zone 13. When the pressure applied by the gas to the closing surface is not greater than the second threshold, the gas can leave the cavity after passing through the flow channel 21, the pressure relief zone 13, and the connecting hole in sequence; when the pressure is greater than the second threshold, the valve 2 is pushed to the bottom surface of the spring sleeve to abut the closing surface of the valve stem 3. At this time, the opening of the flow channel 21 on the spring sleeve is closed by the closing surface, so that the flow channel 21 is closed.

[0039] A sealing structure is provided at the sliding connection between the valve 2 and the inner wall of the cavity to achieve sealed sliding, and the sealing structure is located on the side relative to the inlet port 11 closer to the pressure relief zone 13. The sealing structure can be a sealing ring 5, with a rubber ring groove provided on the valve 2, and the sealing ring 5 installed in the rubber ring groove. Specifically, the sealing ring 5 is a non-metallic sealing ring 5. This prevents gas from entering the pressure relief zone 13 from the sliding connection between the valve 2 and the inner wall of the cavity, so that when the flow channel 21 is closed, all gas leaves from the outlet port 12.

[0040] The flow channel 21 is mainly used to discharge the residual gas in the gas supply pipeline after the ground gas distribution platform stops supplying gas and the self-relief check valve is closed (here, the closure of the self-relief check valve refers to the closure of the output hole 12). Therefore, when the self-relief check valve is closed, it is necessary to ensure that the gas in the gas supply pipeline is discharged from the flow channel 21 as much as possible, while also considering the sealing of the sealing surface and the compactness of the structure. Therefore, the diameter of the flow channel 21 is set to about one-third of the diameter of the output hole 12.

[0041] In this embodiment, the output hole 12 has a diameter of 12 mm and a length of 62 mm, and the flow channel 21 has a diameter of 4 mm; the output surface is partially concave and mates with the closing surface to form an annular groove, such as... Figure 2 As shown, the concave edge is a stop fillet 14 with a radius of 0.2 mm. In other embodiments, appropriate dimensions may be selected depending on the specific circumstances, and no limitation is made here.

[0042] When the storage tank needs to be forcibly opened to release pressure via the safety relief valve, pressurized gas at a certain pressure enters the cavity from the ground gas distribution platform through the inlet port 11. A portion of the gas is discharged outwards through the pressure relief channel (flow channel 21—pressure relief zone 13—connecting hole) of the self-relieving check valve; another portion of the gas exerts a force on the closing surface of the valve 2 at the annular groove. This force is compared with the spring force. When this force is less than the spring force, the valve 2 cannot open, and the main channel (output port 12) of the self-relieving check valve cannot open, allowing all the gas to be discharged outwards through the pressure relief channel. When this operation... When the force exceeds the spring force (here the spring force is the first threshold), valve 2 opens. Under the action of this force, valve 2 slides, and the opening of the output port 12 on the output surface is exposed. The main channel is opened, and the gas can leave the cavity from both the main channel and the pressure relief channel at the same time. When valve 2 moves to abut against valve stem 3, the sealing surface on valve stem 3 blocks the opening of flow channel 21 on the bottom surface of spring sleeve, and pressure relief flow channel 21 is closed. Valve 2 no longer moves, and the gas can only leave the cavity through the output port 12 and enter the safety relief valve. The safety relief valve is forced to open, continuously depressurizing the tank.

[0043] Throughout the entire process of depressurization, opening, closing, and depressurization of the self-relief check valve (where opening and closing refer to the opening and closing of the main channel), the pressure of the gas passing through the main channel (output port 12) can be stabilized within a certain range when the self-relief check valve is open, thus solving the pulsation caused by the unstable instantaneous opening pressure; after closing, it can quickly discharge the gas in the gas supply pipeline through the depressurization channel, preventing abnormal opening of the safety relief valve.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A self-relieving check valve, characterized in that, include: The valve body has an internal cavity, and the valve body has an input hole and an output hole that communicate with the cavity respectively; the output hole communicates with one end of the cavity, and its opening is located on the output surface; A valve is disposed in the cavity and slidably connected to the cavity. A spring is provided between the valve and the inner wall of the cavity. The spring is used to press the end face of one end of the valve against the output surface to close the output hole. The end face of the valve that abuts against the output surface is the closing surface. The output surface is partially concave and cooperates with the closing surface to form an annular groove, or the closing surface is partially concave and cooperates with the output surface to form an annular groove. The annular groove communicates with the input hole. The valve is provided with a flow channel communicating with the outside. In operation, when the pressure exerted by the gas entering from the input port on the closing surface at the annular groove is not greater than the first threshold, the gas leaves the cavity from the flow channel; When the pressure exerted by the gas on the closing surface is greater than the first threshold, the gas pushes the valve at the annular groove to overcome the resistance of the spring and move to open the output port.

2. The self-relieving check valve according to claim 1, characterized in that, The cavity is provided with a closed surface; in the working state, when the pressure applied by the gas to the closed surface is greater than the second threshold, the gas pushes the valve to overcome the resistance of the spring and move to the position where the closed surface closes one end opening of the flow channel, so as to close the flow channel, wherein the second threshold is greater than the first threshold.

3. The self-relieving check valve according to claim 2, characterized in that, The cavity is provided with a valve stem, and the sealing surface is located on the valve stem.

4. The self-relieving check valve according to claim 3, characterized in that, The valve has a closed face on one end in the sliding direction, and the other end face cooperates with the inner wall of the cavity to form a pressure relief area. The valve stem is located in the pressure relief area, and the valve stem has a connecting hole that connects to the outside. The flow channel connects the input port and the pressure relief zone, and one end of the flow channel connects to the pressure relief zone. Its opening is closed by the sealing surface when the pressure exerted by the gas on the closing surface is greater than the second threshold.

5. The self-relieving check valve according to claim 4, characterized in that, The valve is used to form a spring sleeve on the surface of the inner wall of the cavity that forms the pressure relief zone. One end of the spring extends into the spring sleeve and contacts the bottom surface of the spring sleeve. The valve stem is located inside the spring, with one end connected to the inner wall of the cavity and the other end facing the bottom surface of the spring sleeve and having the sealing surface. The opening of the flow channel at one end, which connects to the pressure relief area, is located on the bottom surface of the spring sleeve.

6. The self-relieving check valve according to claim 4, characterized in that, The output port and the pressure relief area are respectively located at both ends of the sliding direction of the valve, and the input port is located on the periphery of the sliding direction of the valve. The sliding connection between the valve and the inner wall of the cavity is provided with a sealing structure to achieve sliding sealing, and the sealing structure is located on the side relative to the input port and closer to the pressure relief area.

7. The self-relieving check valve according to claim 6, characterized in that, The sealing structure is a sealing ring.

8. The self-relieving check valve according to claim 7, characterized in that, The valve is provided with a rubber ring groove, and the sealing ring is installed in the rubber ring groove.

9. The self-relieving check valve according to claim 1 or 6, characterized in that, The valve slides along its own axis.

10. The self-relieving check valve according to claim 1, characterized in that, The diameter of the flow channel is no greater than one-third of the diameter of the output hole.

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