Three-in-one valve structure integrating pressure reduction, pressure relief and stop

Abstract

The invention belongs to the technical field of valves, and discloses a three-in-one valve structure integrating pressure reduction, pressure relief and stop, which comprises a valve body, and the interior of the valve body is composed of an overflow valve, a one-way valve and a safety valve; the overflow valve comprises an overflow valve seat installed in the valve body in a threaded mode, and an overflow valve element is movably and fixedly installed in the overflow valve seat. Through a three-in-one valve structure integrating pressure reduction, pressure relief and stop, an overflow valve (with the pressure reduction function), a one-way valve (with the stop function) and a safety valve (with the pressure relief function) are ingeniously integrated in one valve body, and organic combination of the three functions is achieved. Compared with a traditional scheme that three independent valves need to be installed respectively, the system structure is greatly simplified, the installation space and connecting parts are reduced, the complexity and cost of the system are reduced, and meanwhile the overall reliability and stability of the system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and specifically relates to a three-in-one valve structure integrating pressure reduction, pressure relief and shut-off functions. Background Art

[0002] In many industrial fields and special application scenarios such as aerospace, valves, as key components for controlling the flow of fluids (gases or liquids), pressure regulation and system safety guarantee, play a crucial role. With the continuous development of technology and the increasingly complex application requirements, higher demands are put forward for the performance, functions and integration degree of valves.

[0003] Traditional valve designs often have a single function. For example, a pressure reducing valve is only used to reduce the system pressure, a pressure relief valve only relieves pressure when the pressure is too high, and a shut-off valve is only used to control the on-off of the fluid. In practical applications, in order to achieve the three functions of pressure reduction, pressure relief and shut-off, usually three independent valves need to be installed separately. This not only increases the complexity and cost of the system, but also occupies more installation space, making it difficult to layout the entire system, and at the same time increasing the difficulty of maintenance and management.

[0004] In addition, in some application scenarios with strict weight restrictions, such as the aerospace field, traditional valves are relatively heavy due to the materials and structural designs used, and it is difficult to meet the system's requirements for lightweight. Moreover, some traditional valves are insufficient in terms of resistance to high and low temperatures, impact vibration, and chemical media (such as aviation kerosene), and cannot adapt to complex and changeable working environments, affecting the reliability and safety of the system.

[0005] Therefore, it is of great practical significance and application value to develop a three-in-one valve structure integrating pressure reduction, pressure relief and shut-off functions to solve the problems of traditional valves such as single function, large weight and poor adaptability. Summary of the Invention

[0006] The purpose of the present invention is to provide a three-in-one valve structure integrating pressure reduction, pressure relief and shut-off functions to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A three-in-one valve structure integrating pressure reduction, pressure relief and shut-off functions, including a valve body, and the interior of the valve body consists of three valves: an overflow valve, a check valve and a safety valve; The overflow valve includes an overflow valve seat threadedly installed inside the valve body. An overflow valve core is movably and fixedly installed inside the overflow valve seat. A main spring seat is movably sleeved on the top of the overflow valve core. An overflow valve spring is sleeved on the outer surface of the overflow valve core and is located between the overflow valve core and the main spring seat. An overflow valve adjusting nut is fixedly installed on the top of the main spring seat, and the overflow valve adjusting nut is threadedly connected with the overflow valve seat; The check valve includes a check valve spool movably installed inside the valve body. A diaphragm is sleeved on the outer surface of the check valve spool. A check valve seat is fixedly installed inside the valve body. A check valve spring is elastically connected between the check valve spool and the check valve seat; The safety valve includes an outlet nozzle snap-fitted to the right side of the valve body. A safety valve spool located on the right side of the check valve seat is movably installed inside the outlet nozzle. A safety valve adjusting nut is threadedly installed on the right side of the inner cavity of the outlet nozzle. A safety valve spring is elastically connected between the safety valve adjusting nut and the safety valve spool. A safety valve sleeve is threadedly sleeved between the safety valve adjusting nut and the valve body; Preferably, an O-ring three is provided between the safety valve adjusting nut and the safety valve sleeve. A groove facing the safety valve sleeve is provided on the surface of the safety valve adjusting nut. The O-ring three is located inside the groove.

[0008] Preferably, an O-ring one is provided between both the safety valve sleeve and the check valve seat and the valve body. An O-ring two is also provided between the valve body and the outlet nozzle.

[0009] Preferably, when the pressure of the valve body reaches or exceeds the rated pressure, some of the input medium overflows through the overflow spool to maintain the system pressure close to constant.

[0010] Preferably, the input and output pressures and the rated flow rate are not less than 1.2 L / min. The material of the valve body is a reinforced PEEK material, which contains three materials: carbon fiber, graphite, and PTFE, and has the characteristics of high and low temperature resistance, wear resistance, and high mechanical strength.

[0011] Preferably, the diaphragm is a sealing member of the check valve. The check valve spring and the medium force jointly provide a reverse sealing force; here it is a micro-pressure, and the diaphragm is made of rubber material, meeting the environmental requirements of low temperature resistance of -40°C and resistance to No. 3 aviation kerosene.

[0012] Preferably, both the inlet and outlet of the three-in-one valve are connected by aviation standard threads, and can be disassembled and assembled using common tools, which is convenient for maintenance and replacement.

[0013] Preferably, when the reverse pressure difference reaches the set value, the check valve closes and reverse leakage is not allowed.

[0014] Preferably, when the pressure at the output end reaches the set value, the safety valve starts to relieve pressure; when the pressure at the output end drops to the set value, the safety valve closes to protect the safety of the system.

[0015] The beneficial effects of the present invention are as follows: 1. Through the three-in-one valve structure that integrates pressure reduction, pressure relief, and shut-off functions, the invention ingeniously integrates a pressure relief valve (pressure reduction function), a check valve (shut-off function), and a safety valve (pressure relief function) inside a valve body, achieving an organic combination of the three functions. Compared with the traditional solution that requires installing three independent valves separately, the system structure is greatly simplified, the installation space and connecting components are reduced, the complexity and cost of the system are lowered, and at the same time, the overall reliability and stability of the system are improved; 2. The main body of the valve body of the invention is made of aluminum alloy material, ensuring the structural strength of the valve. At the same time, for the special requirements of the valve core, after comparing the properties of non-metallic materials, a reinforced PEEK material containing carbon fiber, graphite, and PTFE is selected to make the valve core. This material has the characteristics of high and low temperature resistance, wear resistance, high mechanical strength, and light weight, and can effectively reduce the influence of its own gravity on the pressure relief valve spring during vibration and impact, further improving the performance and reliability of the valve and meeting the requirements for lightweight in fields such as aerospace; 3. The three-in-one valve of the invention has good high and low temperature resistance performance and can work normally in extreme temperature environments, ensuring the stable operation of the system under various climatic conditions. At the same time, it also has the ability to resist chemical media such as aviation kerosene, is applicable to a variety of complex working environments, broadens the application range of the valve, and improves the environmental adaptability of the system; 4. The valve of the invention adopts a classic structural design and can work normally under normal and extreme working conditions. When the gas pressure input into the valve body exceeds the normal range, the pressure relief valve can automatically start the pressure relief function, discharge part of the gas through the pressure relief valve core, maintain the system pressure close to constant, and ensure the pressure reduction and voltage stabilization performance. When the gas pressure in the safety valve area is too high, the safety valve core can move quickly to open the safety valve pressure relief port for pressure relief to protect the system safety. The check valve can close when the reverse pressure difference reaches the set value to prevent reverse leakage, ensuring the reliability of the one-way shut-off function; 5. The inlet and outlet of the three-in-one valve of the invention both adopt aviation standard thread connections. This standardized connection method allows the use of general tools for disassembly and assembly, greatly simplifies the maintenance and replacement process, reduces the maintenance cost and time, and improves the maintainability of the system; 6. According to the requirements that the input and output pressures and the rated flow rate are not less than 1.2 L / min, the invention calculates the flow diameter of the pressure relief valve port and then gradually corrects the flow diameter of the valve port through flow measurement tests, thereby ensuring the required value of the flow rate, achieving precise control of the flow rate, and meeting the flow rate requirements of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic cross-sectional structural diagram of the present invention; Figure 3 Schematic diagram of the three-dimensional sectional structure of the present invention; Figure 4 Schematic diagram of the explosion structure of the present invention; Figure 5 Schematic diagram of the regulating nut structure of the overflow valve of the present invention; Figure 6 Schematic diagram of the structure of the outlet nozzle of the present invention; Figure 7 Schematic diagram of the dimensional structure of the present invention; Figure 8 Schematic diagram of the overall flow layout of the present invention; Figure 9 Schematic diagram of the principle of the present invention.

[0017] In the figure: 1. Regulating nut of overflow valve; 2. Main spring seat; 3. Overflow valve seat; 4. Overflow valve spring; 5. Overflow valve core; 6. Valve body; 7. Diaphragm; 8. Check valve core; 9. O-ring I; 10. Safety valve sleeve; 11. Check valve spring; 12. O-ring II; 13. Check valve seat; 14. Outlet nozzle; 15. Safety valve spring; 16. O-ring III; 17. Safety valve regulating nut; 18. Safety valve core. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figures 1 to 9 shown, the embodiment of the present invention provides a three-in-one valve structure integrating pressure reduction, pressure relief and cut-off, including a valve body 6, and the interior of the valve body 6 is composed of three valves: an overflow valve, a check valve and a safety valve; The overflow valve includes an overflow valve seat 3 threadedly installed inside the valve body 6. An overflow valve core 5 is movably and fixedly installed inside the overflow valve seat 3. A main spring seat 2 is movably sleeved on the top of the overflow valve core 5. An overflow valve spring 4 is sleeved on the outer surface of the overflow valve core 5 between the overflow valve core 5 and the main spring seat 2. An overflow valve regulating nut 1 is fixedly installed on the top of the main spring seat 2, and the overflow valve regulating nut 1 is threadedly connected to the overflow valve seat 3; According to the input and output pressures and a rated flow rate of not less than 1.2 L / min, first calculate the flow diameter of the overflow valve port. This calculated value is used as the preliminary design basis, and the flow diameter of the valve port needs to be gradually corrected through flow measurement tests subsequently to ensure the required value of the flow rate.

[0020] Since the valve is required to have a mass of no more than 40 g, the main body made of aluminum alloy can meet the requirement. Considering the valve's need for shock and vibration resistance, the valve core needs to use a lighter material to reduce the impact of its own gravity on the overflow valve spring during the vibration and shock process. After comparing the properties of non-metallic materials, enhanced PEEK material containing carbon fiber, graphite, and PTFE is finally selected, which has the characteristics of high and low temperature resistance, wear resistance, and high mechanical strength.

[0021] The one-way valve includes a one-way valve core 8 movably installed inside the valve body 6. A diaphragm 7 is sleeved on the outer surface of the one-way valve core 8. A one-way valve seat 13 is fixedly installed inside the valve body 6. A one-way valve spring 11 is elastically connected between the one-way valve core 8 and the one-way valve seat 13; The safety valve includes an outlet nozzle 14 snap-fitted to the right side of the valve body 6. A safety valve core 18 located on the right side of the one-way valve seat 13 is movably installed inside the outlet nozzle 14. A safety valve adjusting nut 17 is threadedly installed on the right side of the inner cavity of the outlet nozzle 14. A safety valve spring 15 is elastically connected between the safety valve adjusting nut 17 and the safety valve core 18. A safety valve sleeve 10 is threadedly sleeved between the safety valve adjusting nut 17 and the valve body 6; The left end of the valve is the gas input end. The gas enters the inside of the valve body 6 from the left input port, then flows downward along the overflow valve seat 3, passes through the overflow valve core 5 from the bottom of the overflow valve seat 3 and enters the one-way valve area. When the air pressure entering the valve body 6 is too high, the overflow valve core 5 will be pushed upward by the air pressure at this time. At this time, the overflow valve spring 4 is in a state of elastic compression, and part of the gas will enter the inside of the overflow valve core 5 and be discharged upward through the overflow valve core 5, so as to relieve the pressure of the gas; The gas entering the one-way valve area will contact the one-way valve core 8 and push the one-way valve core 8 to move to the right. At this time, the one-way valve spring 11 is in a state of elastic compression. The gas passes through the one-way valve core 8 and enters the inside of the one-way valve seat 13, and then spreads around the one-way valve seat 13 to the side flow channel above the O-ring one 9, and finally passes through the output port; When the gas pressure in the safety valve area is too high, the air pressure will push the safety valve core 18 to move, so as to open the safety valve pressure relief port located below the safety valve core 18 to relieve the pressure.

[0022] During the design process of the three-in-one valve product, design principles such as product reliability, safety, environmental adaptability, maintainability, supportability, and testability are fully considered to ensure that the designed product can meet the requirements of various technical indicators.

[0023] Reliability design: The valve adopts a classic structure and can work normally under normal and extreme working conditions. During long-term use, the valve's pressure reduction and stabilization, safety pressure relief, and one-way cut-off performance are intact.

[0024] Resistant to high and low temperatures and aviation kerosene, suitable for various environments.

[0025] Maintainability design: Both the inlet and outlet of the three-in-one valve are connected with aviation standard threads, and can be disassembled and assembled with common tools, which is convenient for maintenance and replacement.

[0026] Among them, an O-ring III 16 is arranged between the safety valve adjusting nut 17 and the safety valve sleeve 10. A groove facing the safety valve sleeve 10 is formed on the surface of the safety valve adjusting nut 17, and the O-ring III 16 is located inside the groove.

[0027] Among them, an O-ring I 9 is arranged between the safety valve sleeve 10 and the one-way valve seat 13 and the valve body 6, and an O-ring II 12 is also arranged between the valve body 6 and the outlet nozzle 14.

[0028] Among them, when the pressure of the valve body 6 reaches or exceeds the rated pressure, some of the input medium overflows through the overflow valve core 5 to maintain the system pressure close to a constant.

[0029] Among them, the input and output pressures and the rated flow rate are not less than 1.2 L / min. The material of the valve body 6 is reinforced PEEK material, which contains three materials: carbon fiber, graphite, and PTFE, and has the characteristics of being resistant to high and low temperatures, wear resistance, and high mechanical strength.

[0030] Among them, the diaphragm 7 is the seal of the one-way valve, and the one-way valve spring and the medium force jointly provide the reverse sealing force; here it is a micro-pressure, and the diaphragm 7 is made of rubber material, meeting the environmental requirements of being resistant to low temperature of -40°C and 3# aviation kerosene.

[0031] Among them, both the inlet and outlet of the three-in-one valve are connected with aviation standard threads, and can be disassembled and assembled with common tools, which is convenient for maintenance and replacement.

[0032] Among them, when the reverse pressure difference reaches the set value, the one-way valve closes and reverse leakage is not allowed.

[0033] Among them, when the pressure at the output end reaches the set value, the safety valve starts to relieve pressure; when the pressure at the output end drops to the set value, the safety valve closes to protect the safety of the system.

[0034] Working principle and usage process: The left end of the valve is the gas input port. After the gas enters the internal space of the valve body 6 from the left end input port, it will flow downward along the channel of the overflow valve seat 3, pass through the bottom of the overflow valve seat 3 and the overflow valve core 5, and then enter the area where the one-way valve is located.

[0035] When the gas pressure entering the interior of the valve body 6 exceeds the normal range and becomes too high, under the action of the high-pressure gas, the overflow valve spool 5 will be pushed upward. At this time, the overflow valve spring 4 is compressed and in a state of elastic compression. During this process, part of the gas will enter the interior of the overflow valve spool 5 and be discharged upward through the overflow valve spool 5, thereby realizing the pressure relief operation of the gas.

[0036] The gas entering the check valve area will come into contact with the check valve spool 8 and push the check valve spool 8 to move to the right. During this process, the check valve spring 11 is also compressed and in a state of elastic compression. The gas then passes through the check valve spool 8, enters the interior of the check valve seat 13, and then diffuses around from the check valve seat 13, flows to the side flow channel above the O-ring 9, and finally is discharged through the output port.

[0037] In addition, when the gas pressure in the safety valve area is too high, the high-pressure gas will push the safety valve spool 18 to move, thereby opening the safety valve pressure relief port located below the safety valve spool 18 for pressure relief.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-in-one valve structure integrating pressure relief, pressure release and shut-off, comprising a valve body (6), characterized in that: The interior of the valve body (6) consists of three valves: an overflow valve, a check valve, and a safety valve; The overflow valve includes an overflow valve seat (3) threadedly installed inside the valve body (6). An overflow valve core (5) is movably and fixedly installed inside the overflow valve seat (3). A main spring seat (2) is movably sleeved on the top of the overflow valve core (5). An overflow valve spring (4) is sleeved on the outer surface of the overflow valve core (5) between the overflow valve core (5) and the main spring seat (2). An overflow valve adjusting nut (1) is fixedly installed on the top of the main spring seat (2). The overflow valve adjusting nut (1) is threadedly connected to the overflow valve seat (3); The check valve includes a check valve core (8) movably installed inside the valve body (6). A diaphragm (7) is sleeved on the outer surface of the check valve core (8). A check valve seat (13) is fixedly installed inside the valve body (6). A check valve spring (11) elastically connects the check valve core (8) and the check valve seat (13); The safety valve includes an outlet nozzle (14) snap-fitted on the right side of the valve body (6). A safety valve core (18) is movably installed inside the outlet nozzle (14) on the right side of the check valve seat (13). A safety valve adjusting nut (17) is threadedly installed on the right side of the inner cavity of the outlet nozzle (14). A safety valve spring (15) elastically connects the safety valve adjusting nut (17) and the safety valve core (18). A safety valve sleeve (10) is threadedly sleeved between the safety valve adjusting nut (17) and the valve body (6).

2. The three-in-one valve structure integrating pressure reduction, pressure relief and cut-off according to claim 1, characterized in that: An O-ring III (16) is provided between the safety valve adjusting nut (17) and the safety valve sleeve (10). A groove facing the safety valve sleeve (10) is provided on the surface of the safety valve adjusting nut (17). The O-ring III (16) is located inside the groove.

3. The structure of a three-in-one valve integrating pressure reduction, pressure relief and shut-off according to claim 1, characterized in that: An O-ring I (9) is provided between both the safety valve sleeve (10) and the check valve seat (13) and the valve body (6). An O-ring II (12) is also provided between the valve body (6) and the outlet nozzle (14).

4. A three-in-one valve structure integrating pressure reduction, pressure relief and shut-off, characterized in that: When the pressure of the valve body (6) reaches or exceeds the rated pressure, some of the input medium overflows through the overflow valve core (5) to maintain the system pressure close to a constant.

5. A three-in-one valve structure integrating pressure relief, pressure release and shut-off, characterized in that: The input and output pressures and the rated flow rate are not less than 1.2 L / min. The material of the valve body (6) is a reinforced PEEK material, containing three materials: carbon fiber, graphite, and PTFE, and having the characteristics of being resistant to high and low temperatures, wear-resistant, and high mechanical strength.

6. The structure of a three-in-one valve integrating pressure relief, pressure reduction and shut-off according to claim 1, characterized in that: The diaphragm (7) is a sealing part of the check valve. The check valve spring and the medium force jointly provide a reverse sealing force; here it is a micro-pressure. The diaphragm (7) is made of rubber material, meeting the environmental requirements of being resistant to low temperature of -40°C and 3# aviation kerosene.

7. A three-in-one valve structure integrating pressure reduction, pressure relief and cut-off, characterized in that: Both the inlet and outlet of the three-in-one valve are connected by aviation standard threads, and can be disassembled and assembled using common tools, which is convenient for maintenance and replacement.

8. A three-in-one valve structure integrating pressure relief, pressure reduction and shut-off, characterized in that: When the reverse pressure difference reaches the set value, the check valve closes, and reverse leakage is not allowed.

9. A three-in-one valve structure integrating pressure relief, pressure release and cut-off, characterized in that: When the pressure at the output end reaches the set value, the safety valve starts to relieve pressure; when the pressure at the output end drops to the set value, the safety valve closes to protect the safety of the system.

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