One-way valve structure for preventing leakage of flammable and explosive gas

Abstract

A one-way valve structure for preventing flammable and explosive gas from leaking comprises a first clamping ring, a first gas filter, a valve, a valve shell, a first spring, a pressure adjusting sealing gasket, a valve connector, a second gas filter, a second clamping ring, a second spring and a closing valve. Medium backflow can be effectively prevented, and the risk of dangerous gas leakage is reduced; wear-resistant and corrosion-resistant high-performance materials are used, so that the service life is prolonged, and the failure rate is reduced; the device is suitable for various gases, gas-liquid mixed media and the like, and can stably work under high-temperature, high-pressure, low-temperature and other complex working conditions; the unit body design enables installation and maintenance to be more convenient, and labor cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical structure technology and relates to air and hydraulic sealing valve structures, particularly to one-way flow sealing structures for flammable and explosive gases and air and hydraulic systems with high cleanliness requirements. Specifically, it is a one-way valve structure that prevents the leakage of flammable and explosive gases. Background Art

[0002] The one-way valve structure is the core component of the air supply and hydraulic system. Its main function is to prevent the high temperature, high pressure or dangerous gas and liquid in the working area from flowing back to the incoming end. The working flow path is a one-way sealed flow path. Common one-way valve structures are shown in Figure 1 , are all plane matching structures, with high processing requirements, and the sealing effect is easily affected by the quality of parts and foreign objects, especially when there are foreign objects, which can easily cause valve jamming and air leakage; when the medium pressure and flow rate increase rapidly, the impact generated can easily damage the pipeline and equipment; the opening / closing pressure of the valve is fixed, and when the medium is switched, the opening pressure cannot be unified; when the manufacturing is poor, it may not be possible to effectively organize the backflow; at extreme temperatures, the material of traditional valves may expand or contract, affecting the sealing performance of the valve; when the safety and reliability requirements are high, the material, structure and reliability of traditional one-way valves are not applicable.

[0003] Common one-way valve structures are all flat-surface structures, which require high processing requirements. Their sealing performance is easily affected by component quality and foreign matter. Especially when there is foreign matter, the valve can easily become stuck or leak. When safety and reliability requirements are high, the materials, structure, and reliability of traditional one-way valves are not suitable. Summary of the Invention

[0004] Purpose of the Invention

[0005] The technical problem to be solved by the present invention is to provide a one-way valve structure for preventing leakage of flammable and explosive gases, thereby solving the limitations of traditional one-way valves that are easily affected by unnecessary objects, have low reliability, and have a single function, and solving the safety hazards of working in flammable and explosive gas environments.

[0006] Technical Solution

[0007] A one-way valve structure for preventing leakage of flammable and explosive gases, comprising a first clamping ring, a first air filter, a valve, a valve housing, a first spring, a pressure-regulating sealing gasket, a valve joint, a second air filter, a second clamping ring, a second spring, and a closing valve; a first air filter is provided on one side of the valve housing in the air inlet direction and is fixed by the first clamping ring; the valve is installed in the valve housing to which it belongs; one end of the first spring is installed in the spring mounting groove of the valve to which it belongs, and the other end is installed on the valve joint; a conical surface is provided on the valve near the air inlet direction to achieve a conical surface seal with the valve housing to achieve a first sealing surface; the valve is affected by the air inlet pressure and can move left and right with the first spring; the valve housing and the valve joint are connected by a pressure-regulating sealing gasket To achieve sealing, the pressure-regulating sealing gasket is made of flexible material. By adjusting the thickness of the pressure-regulating sealing gasket, the preload force of the first spring can be adjusted to achieve the purpose of setting different valve opening pressures; a second air filter is provided in the middle of the valve joint and is fixed by a second clamping ring. A second spring is provided on the side of the valve joint close to the air outlet, and a closing valve is connected to the second spring. The closing valve and the valve joint form a conical seal of the second sealing surface. The elastic force of the second spring is greater than the elastic force of the first spring. When the intake pressure is greater than the elastic force of the first spring and less than the elastic force of the second spring, the valve opens and the closing valve closes. When there is no intake pressure, the closing valve closes before the valve, thereby achieving the purpose of preventing leakage.

[0008] Furthermore, the flexible material includes a metal material or a non-metal material.

[0009] Furthermore, the metal material includes T2 copper material, 50CrVA, QAL10, 05Cr15Ni5Cu4Nb, and 0Cr17Ni14Mo2.

[0010] Furthermore, the non-metallic material includes polytetrafluoroethylene (PTFE).

[0011] Furthermore, the conical sealing surfaces of the first sealing surface and the second sealing surface are in the same direction.

[0012] Furthermore, a valve jacket is provided on the side of the valve close to the air intake direction, and the valve jacket is fixed to the valve through a slot.

[0013] Furthermore, a vent hole is provided on the valve housing, and the incoming gas passes through the vent hole and is filtered by the second air filter before being discharged.

[0014] Furthermore, the vent hole is a three-way structure, divided into an air inlet channel and two air outlet channels. The incoming gas flows in through the air inlet channel and is discharged from the respective air outlet channels at both ends.

[0015] After further gas is filtered through the air filter, it pushes the valve and compresses the first spring. The gas flows in through the gap between the valve and the valve housing, enters through the internal flow path of the valve housing, and is discharged through the second air filter.

[0016] Furthermore, the valve is provided with an air vent in the direction away from the air inlet to prevent the initial pressure from being too high and the spring from being compressed to a limit value, which causes the valve and the valve joint to close and cause air path blockage.

[0017] Furthermore, it also includes a flow limiting nozzle, which is arranged on the valve housing and located at one end of the air intake direction.

[0018] The beneficial effects of this application are:

[0019] The new one-way valve structure for leak-proofing flammable and explosive gases utilizes advanced sealing materials and structural design to effectively prevent backflow of media and reduce the risk of hazardous gas leaks. The use of high-performance, wear-resistant and corrosion-resistant materials extends service life and reduces failure rates. It is suitable for use with a variety of gases, gas-liquid mixtures, and other media, and can operate stably under complex operating conditions such as high temperature, high pressure, and low temperature. Its unitized design facilitates installation and maintenance, reducing labor costs. The new one-way valve structure for leak-proofing flammable and explosive gases, with its efficient sealing and strong durability, has brought significant economic and environmental benefits in terms of improving system efficiency, reducing maintenance costs, and minimizing environmental pollution. Its technological innovations and performance advantages make it suitable for widespread use in modern industrial systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the existing one-way valve structure;

[0021] Figure 2 This is a schematic diagram of the one-way valve structure of the present invention;

[0022] Figure 3 Schematic diagram of the open state;

[0023] Figure 4 Schematic diagram of the air filter device;

[0024] Figure 5 Schematic diagram of the valve device. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the embodiments of the present invention. In the examples, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below by reference are illustrative and intended to be used to explain the present invention, and should not be understood as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The following is a detailed description in conjunction with the embodiments of the present invention.

[0026] The present invention provides a one-way valve structure, which solves the problems of high processing cost caused by high processing precision of traditional one-way valves, low reliability due to susceptibility to excess objects, uncontrollable flow and single function, and safety problems of working in flammable and explosive gas environments.

[0027] Core invention: A one-way valve structure for preventing leakage of flammable and explosive gases (see Figure 2 and Figure 3 ), the structure includes a flow limiting nozzle, a clamping ring, an air filter, a valve, a spring, a pressure regulating gasket, a valve joint, a valve housing closing valve and other parts, which realize the functions of flow limiting, filtering, pressure regulating, and leak prevention, and the overall structure is compact; the valve housing and the valve device seal adopt conical surface sealing, and a special structure valve is designed. When the gas is opened, the gas does not circulate, and the movement of the valve mating surface is guided by the gas pressure to realize the one-way flow of gas; at the same time, an air filter device is designed at the valve inlet end to reduce the problem of valve jamming and the inability to close the sealing surface caused by the entry of excess objects.

[0028] 2. Secondary invention point: The valve inlet is equipped with a flow limiting nozzle to limit the explosion hazard caused by excessive gas entering.

[0029] 3. Secondary invention point: The air filter device is designed at the valve outlet (see Figure 4 ), installed in the rear valve joint to prevent excess material produced by valve wear from causing the downstream motion mechanism to stagnate or the nozzle to be blocked.

[0030] 4. Secondary invention point: The sealing gasket can be adjusted to ensure the sealing of the cavity while adjusting the valve opening pressure according to the opening pressure requirements.

[0031] 5. Secondary invention points: The valve housing and valve device seal adopt a conical sealing structure, which reduces the need for matching and grinding processing and reduces the processing difficulty.

[0032] 6. Secondary invention points: Special materials are used in the guide fitting of the valve housing and the valve device to reduce the possibility of ignition of flammable and explosive gases due to metal friction during the operation of the valve.

[0033] 7. Secondary invention point: The valve device adopts a double-layer material structure (see Figure 5 ), which reduces the weight of parts and reduces the eccentric wear of the guide mating surface caused by gravity.

[0034] 8. The main invention point: The valve and air filter device are designed as a unit body, which is convenient for overall replacement.

[0035] 9. Main invention points: The valve housing and the rear valve joint are connected by threads, which is convenient for disassembly, maintenance and cleaning.

[0036] 10. Secondary invention point: The closing valve at the tail of the valve uses the pressure difference to delay the initial gas inflow when opening and the leakage of the remaining gas at the end.

[0037] Example 1

[0038] A one-way valve assembly for preventing the leakage of flammable and explosive gases. The assembly comprises a flow restrictor, a retaining ring, an air filter, a valve, a spring, a pressure-regulating gasket, a valve joint, and a valve housing. The overall structure is compact, with a flow restrictor installed at the valve inlet to limit the risk of explosions caused by excessive gas ingress. Air filters are installed at both the inlet and outlet ends, one in the front valve housing and the other in the rear valve joint. The inlet filter prevents excess material from entering and potentially causing the valve to jam, while the outlet filter prevents excess material from wear and tear on the valve, potentially causing jamming of the downstream motion mechanism or nozzle blockage. The valve housing and rear valve joint are threadedly connected, with the valve assembly and spring installed between them. Adjusting the gasket ensures airtightness within the chamber while adjusting the valve opening pressure according to the required opening pressure. The valve housing and valve assembly seal utilize a conical sealing structure, reducing the need for machining and machining of the two components. Special materials are also used in the guide joints between the valve housing and the valve assembly to minimize the risk of explosions caused by flammable and explosive gases during operation. The valve assembly utilizes a double-layer material structure, reducing component weight while minimizing weight-induced wear and eccentricity on the guide mating surfaces. The valve assembly and air filter are designed as a single unit, while the valve housing and rear valve connector are threaded for easy replacement, disassembly, and maintenance.

[0039] Example 2

[0040] To achieve the above object, the present invention adopts the following technical solutions:

[0041] A one-way valve structure for preventing leakage of flammable and explosive gases, comprising a first clamping ring 2, a first air filter 3, a valve 4, a valve housing 5, a first spring 6, a pressure-regulating sealing gasket 7, a valve joint 8, a second air filter 9, a second clamping ring 10, a second spring 11, and a closing valve 12; the valve housing 5 is provided with a first air filter 3 on one side of the air inlet direction and is fixed by the first clamping ring 2, the valve 4 is installed in the valve housing 5 to which it belongs, one end of the first spring 6 is installed in the spring mounting groove of the valve 4 to which it belongs, and the other end is installed on the valve joint 8, a conical surface is provided on the valve 4 near the air inlet direction, and a conical surface seal is achieved with the valve housing 5 for achieving a first sealing surface, the valve 4 is affected by the air inlet pressure and can move left and right with the first spring 6, the valve housing 5 and the valve joint 8 are achieved by the pressure-regulating sealing gasket 7 Sealing, the pressure-regulating sealing gasket 7 is made of flexible material. By adjusting the thickness of the pressure-regulating sealing gasket 7, the preload force of the first spring 6 can be adjusted to achieve the purpose of setting different opening pressures of the valve 4; a second air filter 9 is provided in the middle of the valve joint 8 and is fixed by a second clamping ring 10. A second spring 11 is provided on the side of the valve joint 8 close to the air outlet. A closing valve 12 is connected to the second spring 11. The closing valve 12 and the valve joint 8 form a conical surface seal of the second sealing surface. The elastic force of the second spring 11 is greater than the elastic force of the first spring 6. When the intake pressure is greater than the elastic force of the first spring 6 and less than the elastic force of the second spring 11, the valve 4 is opened and the closing valve 12 is closed. When there is no intake pressure, the closing valve 12 is closed before the valve 4, thereby achieving the purpose of preventing leakage.

[0042] In one embodiment of the present invention, the flexible material includes a metal material or a non-metal material.

[0043] In one embodiment of the present invention, the metal material includes T2 copper material, 50CrVA, QAL10, 05Cr15Ni5Cu4Nb, and 0Cr17Ni14Mo2.

[0044] In one embodiment of the present invention, the non-metallic material includes polytetrafluoroethylene (PTFE).

[0045] In a certain embodiment of the present invention, the conical sealing surfaces of the first sealing surface and the second sealing surface are in the same direction.

[0046] In a certain embodiment of the present invention, a valve jacket is provided on the side of the valve 4 close to the air intake direction, and the valve jacket is fixed to the valve 4 through a slot.

[0047] In one embodiment of the present invention, a vent hole is provided on the valve housing, and the incoming gas passes through the vent hole and is filtered by the second air filter 9 before being discharged.

[0048] In a certain embodiment of the present invention, the vent hole is a three-way structure, which is divided into an air inlet channel and two air outlet channels. The incoming gas flows into the air inlet channel and is discharged from the respective air outlet channels at both ends.

[0049] In a certain embodiment of the present invention, after the gas is filtered through the air filter, it pushes the valve 4 and compresses the first spring 6. The gas flows in through the gap between the valve 4 and the valve housing 5, enters through the internal flow path of the valve housing 5, and is discharged through the second air filter.

[0050] In one embodiment of the present invention, the valve 4 is provided with an air vent in the direction away from the air inlet to prevent the initial pressure from being too high and the spring from being compressed to a limit value, which causes the valve 4 and the valve joint 8 to close and cause the air path to be blocked.

[0051] In a certain embodiment of the present invention, a flow limiting nozzle 1 is further included. The flow limiting nozzle 1 is arranged on the valve housing 5 and is located at one end of the air intake direction, and is used to adjust the air intake flow and pressure to adapt to different media and multiple working conditions.

[0052] In addition, unless otherwise defined, the technical or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The words "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer" used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. Therefore, they should not be understood as limitations on this application. The words "first," "second," "third," and similar terms used in the description of this application are used only for descriptive purposes to distinguish different components and should not be understood to indicate or imply relative importance. The words "one," "an," or "the" used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as meaning the presence of at least one. The words "include" or "comprises" used in the description of this application mean that the element or object listed before the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0053] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0054] The above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Within the spirit and principles of the present invention, any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, any modification, equivalent replacement, improvement, etc. made should be included in the scope of protection of the present invention.

Claims

1. A one-way valve structure for preventing leakage of flammable and explosive gases, characterized in that: The cam is provided with a first spring, a second spring, a second spring, a second spring, and a closing valve; a first air filter is provided on one side of the valve housing in the air inlet direction, and is fixed by the first spring; the valve is installed in the valve housing to which it belongs; one end of the first spring is installed in the spring mounting groove of the valve to which it belongs, and the other end is installed on the valve joint; a conical surface is provided on the valve near the air inlet direction, and a conical surface seal is achieved with the valve housing to achieve a first sealing surface seal; the valve is affected by the air inlet pressure and can move left and right with the first spring; the valve housing and the valve joint are sealed by a pressure regulating seal The gasket realizes sealing, and the preload force of the first spring is adjusted by adjusting the thickness of the pressure-regulating sealing gasket, so as to achieve the purpose of setting different valve opening pressures; a second air filter is provided in the middle of the valve joint and is fixed by a second clamping ring, and a second spring is provided on the side of the valve joint close to the air outlet, and a closing valve is connected to the second spring, and the closing valve and the valve joint form a conical seal of the second sealing surface, and the elastic force of the second spring is greater than the elastic force of the first spring. When the intake pressure is greater than the elastic force of the first spring and less than the elastic force of the second spring, the valve opens and the closing valve closes. When there is no intake pressure, the closing valve closes before the valve.

2. The one-way valve structure according to claim 1, characterized in that: The flexible material includes a metal material or a non-metal material.

3. The one-way valve structure according to claim 2, characterized in that: The metal materials include T2 copper material, 50CrVA, QAL10, 05Cr15Ni5Cu4Nb, and 0Cr17Ni14Mo2.

4. The one-way valve structure according to claim 2, characterized in that: The non-metallic material includes polytetrafluoroethylene.

5. The one-way valve structure according to claim 1, characterized in that: The conical sealing surfaces of the first sealing surface and the second sealing surface are in the same direction.

6. The one-way valve structure according to claim 1, characterized in that: A valve jacket is provided on the side of the valve close to the air inlet direction, and the valve jacket is fixed on the valve through a slot.

7. The one-way valve structure according to claim 6, characterized in that: The valve outer shell is provided with a vent hole, and the incoming gas passes through the vent hole and is filtered by the second air filter before being discharged.

8. The one-way valve structure according to claim 7, characterized in that: The vent hole is a three-way structure, divided into an air inlet channel and two air outlet channels. The incoming gas flows in through the air inlet channel and is discharged from the respective air outlet channels at both ends.

9. The one-way valve structure according to claim 8, characterized in that: After being filtered by the air filter, the gas pushes the valve and compresses the first spring. The gas flows in through the gap between the valve and the valve housing, enters through the internal flow path of the valve housing, and is discharged through the second air filter.

10. The one-way valve structure according to claim 1, characterized in that: The valve is provided with a vent hole away from the air inlet direction to prevent the initial pressure from being too high and the spring compression reaching the limit value, resulting in the closure of the valve and the valve joint and causing air path blockage; it also includes a flow limiting nozzle, which is arranged on the valve housing and is located at one end in the air inlet direction.

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