Diaphragm type high-temperature-resistant emptying valve

Abstract

The invention relates to the technical field of emptying valves, and discloses a diaphragm type high-temperature-resistant emptying valve which comprises a valve seat, a plurality of valve bodies are fixedly connected to the bottom of the valve seat, a connecting plate is fixedly connected to the top of the valve seat, a diaphragm is fixedly connected to the interior of the connecting plate, a shell is fixedly connected to the top of the connecting plate, and a fixing ring is fixedly connected to the inner diameter of the shell. A sliding column is slidably connected to the inner diameter of the fixing ring, an extrusion part is fixedly connected to the bottom end of the sliding column, a first spring is fixedly connected between the extrusion part and the fixing ring, and a second spring is arranged in the first spring. In the normal state, the first spring and the second spring abut against the extrusion piece to be tightly attached to the valve seat, when the pressure rises, the first spring is compressed firstly, the extrusion piece moves upwards, the valve is opened, at the moment, the first spring provides small resistance, the valve can respond to small overpressure rapidly, and the compression amount of the first spring is increased along with continuous rising of the pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of vent valves, in particular to a diaphragm type high-temperature resistant vent valve. Background Art

[0002] The diaphragm-type high-temperature resistant vent valve is a key component in industrial processes and is widely used in production systems in high-temperature and high-pressure environments such as petroleum, chemical, and electric power. It is mainly composed of core components such as valve body, valve core, diaphragm, and spring. The diaphragm plays a vital role in sealing and pressure sensing. During system operation, when the internal pressure reaches the set threshold, the diaphragm will deform to drive the valve core to move, and then open the valve to quickly vent and discharge excess gas or liquid media, thereby ensuring that the system pressure is in a safe and stable operating range, avoiding equipment damage, production interruption, and even safety accidents caused by overpressure, and ensuring that the entire industrial production process can be continuously promoted smoothly and efficiently.

[0003] Some vent valves in the existing technology have difficulty in achieving precise flow control at different pressure stages. For small overpressure conditions, they cannot provide sufficiently fine elastic force changes, resulting in excessive changes in valve opening and causing system pressure fluctuations. They are not adaptable enough to working conditions with complex and diverse pressure changes, affecting the stability of the system and the normal operation of the equipment. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a diaphragm-type high-temperature resistant vent valve to solve the problem that the existing vent valve is difficult to accurately control the flow rate at different pressures.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a diaphragm-type high-temperature resistant vent valve, including a valve seat, a plurality of valve bodies are fixedly connected to the bottom of the valve seat, a connecting plate is fixedly connected to the top of the valve seat, a diaphragm is fixedly connected to the inside of the connecting plate, a shell is fixedly connected to the top of the connecting plate, a fixing ring is fixedly connected to the inner diameter of the shell, a sliding column is slidably connected to the inner diameter of the fixing ring, an extrusion piece is fixedly connected to the bottom end of the sliding column, a first spring is fixedly connected between the extrusion piece and the fixing ring, a second spring is arranged inside the first spring, the top of the second spring is fixedly connected to the fixing ring, and an indicator assembly is arranged on the right side of the extrusion piece.

[0006] By adopting the above technical solution, it is possible to achieve precise adjustment of the valve opening according to the system pressure change through the dual-spring differential design. At the initial stage of pressure rise, the first spring responds first with its smaller stiffness and preload, opening the valve to achieve small flow pressure relief to cope with slight overpressure. As the pressure continues to rise, the second spring takes over, allowing the extrusion part to fully open the valve to meet the large flow venting requirements. When closing, the two springs act in sequence to make the extrusion part move down smoothly to close the valve to avoid impact.

[0007] Preferably, the indicating assembly includes a connecting piece, which is fixedly connected to the extrusion piece, a rack is fixedly connected to the top of the connecting piece, a gear is meshed with the front side of the rack, and a pointer is fixedly connected to the right end of the gear.

[0008] Preferably, a connection box is fixedly connected to the right side of the shell, and sliding grooves are provided on the left and right sides of the inner wall of the connection box. The rack slides in the two sliding grooves, and a scale line is provided on the right side of the connection box.

[0009] Preferably, an electric push rod is fixedly connected to the top inner diameter of the shell, a moving part is fixedly provided at the output end of the electric push rod, a sliding rod is slidably connected to the inner diameter of the moving part, and the bottom end of the sliding rod is fixedly connected to the sliding column.

[0010] Preferably, a plurality of disc springs are fixedly connected to the inner wall of the extrusion piece, and a buffer ring is fixedly connected to the bottom of the fixing ring.

[0011] Preferably, a fixing plate is fixedly connected to the inner diameter of the valve body on the right side, a rotating rod is rotatably connected to the right side of the fixing plate, and a plurality of blades are fixedly connected to the surface of the rotating rod.

[0012] Preferably, the gear is rotationally connected to the inner wall of the connection box, the right side of the pointer passes through and extends to the right side of the connection box, and the pointer is rotationally connected to the connection box.

[0013] Preferably, the first spring stiffness is 3-8 N / mm, the second spring stiffness is 80-150 N / mm, the first spring preload force is 80-300 N, the second spring preload force is 800-2000 N, and the first spring length is greater than the second spring length.

[0014] Preferably, the extrusion piece is made of nickel-based alloy, and the buffer ring is made of silicone rubber.

[0015] Preferably, the diaphragm is composed of high-temperature resistant nickel-based alloy fibers and fluorosilicone rubber, the high-temperature resistant nickel-based alloy fibers are woven into a grid-like base structure, and the fluorosilicone rubber is filled in the gaps of the grid-like base structure.

[0016] Working principle: Under normal conditions, the first and second springs press against the extrusion piece to make it fit tightly against the valve seat, and the valve is closed. If the system pressure rises, the medium pressure pushes the extrusion piece upward to squeeze the first spring, which is compressed first due to its low stiffness and small preload. The valve opens and can quickly respond to small overpressure. As the pressure continues to rise, the second spring begins to compress under pressure, pushing the extrusion piece until the valve is fully opened to achieve high-flow discharge. When the pressure drops, the second spring's large elastic force pushes the extrusion piece downward first, and the first spring continues to assist, so that the extrusion piece closes the valve smoothly to avoid impact. If the user needs manual control, the electric push rod can be manipulated to pull the moving part, driving the sliding rod, sliding column and extrusion part to move to open or close the valve. It can respond quickly in an emergency, and the daily stable operation relies on the automatic adjustment of the first and second springs. When the valve is opened or closed, the extrusion drives the connecting piece and the rack to move. The rack slides in the slide groove of the connecting box, driving the gear and the pointer to rotate. The pointer points to the scale line on the right side of the connecting box. The user can intuitively understand the degree of valve opening. When the medium flows through the right valve body, it impacts the blade, causing it to rotate and allowing the medium to form a vortex flow, which generates a pressure difference on the diaphragm and drives the extrusion to quickly open the valve to relieve pressure. When the valve is closed, the extrusion moves toward the valve seat. The buffer ring first buffers the impact, and the disc spring absorbs kinetic energy to reduce diaphragm wear. The extrusion is made of nickel-based alloy to ensure stability and life. The buffer ring is made of silicone rubber to absorb impact. The diaphragm is composed of high-temperature resistant nickel-based alloy fiber and fluorosilicone rubber. It can withstand high temperatures and has good sealing effect. It can adapt to pressure changes and component movement to ensure stable operation of the system.

[0017] The present invention provides a diaphragm-type high-temperature resistant vent valve. It has the following beneficial effects: 1. In the present invention, under normal conditions, the first spring and the second spring support the extrusion piece and fit closely with the valve seat. When the pressure rises, the first spring is compressed first, the extrusion piece moves upward, and the valve opens. At this time, the first spring provides less resistance, allowing the valve to respond quickly to smaller overpressures. As the pressure continues to rise, the compression of the first spring increases. At this time, the second spring begins to be compressed by the upward force of the extrusion piece, pushing the extrusion piece to move upward until it is fully opened, achieving large-flow discharge. When the system pressure drops, the second spring first pushes the extrusion piece downward. As the pressure further decreases, the first spring continues to apply downward force to the extrusion piece. The two springs act in sequence to make the extrusion piece move downward smoothly, and finally close the valve, avoiding the impact caused by sudden closing.

[0018] 2. In the present invention, the movable part is driven to move upward by the electric push rod. At this time, the movable part pulls the sliding rod to move upward, thereby pulling the sliding column and the extrusion part to move. At this time, the extrusion part is separated from the diaphragm and the valve is opened. The valve can not only be automatically opened by the first spring and the second spring, but also can be opened and closed by controlling the valve by the electric push rod. In case of emergencies and emergency venting or precise flow control, the electric push rod can quickly open or close the valve to avoid equipment damage or production interruption due to pressure out of control. In the daily stable operation stage, relying on the automatic adjustment mechanism of the spring, manual intervention can be reduced, and energy consumption and operation and maintenance costs can be reduced.

[0019] 3、The valve opening degree can be converted into the rotation of the pointer, the operator can understand the opening degree of the valve in real time by observing the position of the pointer with naked eyes, the on-site inspection efficiency is improved, and the working state of the valve is quickly judged.

[0020] 4、The valve body is provided with a plurality of rotatable blades, when the medium flows to the air inlet of the valve body, the blades make the medium form a vortex flow and rush into the valve, because the pressure at the center of the vortex is low and the pressure around the vortex is high, a large pressure difference is generated on the diaphragm, the extrusion piece is driven to overcome the resistance and quickly open and discharge, after the discharge, under the impact of the medium flow, the extrusion piece moves towards the valve seat, the buffer ring is deformed under pressure to buffer the initial impact, then the disc spring is compressed to further absorb kinetic energy, the closing speed of the extrusion piece extruding the diaphragm is slowed down, the valve seat is stably seated, the discharge efficiency is improved, the vortex flow assists the extrusion piece to quickly open, a large amount of medium can be quickly emptied, the overpressure is coped with, the system safety is ensured, the valve life is prolonged, the buffer ring avoids the hard collision of the extrusion piece on the diaphragm and the valve seat, the sealing surface wear is reduced, the maintenance frequency is reduced, and the reliability and adaptability of the valve under complex working conditions are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the present application; Figure 2 It is a valve body cross-sectional view of the present application; Figure 3 It is a shell cross-sectional view of the present application; Figure 4 It is a moving piece cross-sectional view of the present application; Figure 5 It is a second spring schematic view of the present application; Figure 6 It is a gear schematic view of the present application; Figure 7 It is a scale line schematic view of the present application; Figure 8 It is a disc spring schematic view of the present application.

[0022] 1, valve body; 2, valve seat; 3, connecting plate; 4, shell; 5, connecting box; 6, rotating rod; 7, blade; 8, fixed plate; 9, diaphragm; 10, electric push rod; 11, moving piece; 12, sliding rod; 13, fixed ring; 14, extrusion piece; 15, connecting piece; 16, rack; 17, gear; 18, first spring; 19, second spring; 20, pointer; 21, scale line; 22, buffer ring; 23, disc spring; 24, sliding groove; 25, sliding column. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] Please see the attached Figure 1 -Attached Figure 5 An embodiment of the present invention provides a diaphragm-type high-temperature resistant vent valve, including a valve seat 2, a plurality of valve bodies 1 fixedly connected to the bottom of the valve seat 2, a connecting plate 3 fixedly connected to the top of the valve seat 2, a diaphragm 9 fixedly connected to the inside of the connecting plate 3, a shell 4 fixedly connected to the top of the connecting plate 3, a fixing ring 13 fixedly connected to the inner diameter of the shell 4, a sliding column 25 slidably connected to the inner diameter of the fixing ring 13, an extrusion piece 14 fixedly connected to the bottom end of the sliding column 25, a first spring 18 fixedly connected between the extrusion piece 14 and the fixing ring 13, a second spring 19 arranged inside the first spring 18, a top of the second spring 19 fixedly connected to the fixing ring 13, and an indicator component arranged on the right side of the extrusion piece 14.

[0025] Specifically, under normal conditions, the first spring 18 and the second spring 19 press against the extrusion piece 14, so that it fits tightly against the valve seat 2, and the valve is in a closed state; if the system pressure rises, the medium pressure pushes the extrusion piece 14 to move upward and squeeze the first spring 18. Due to the small stiffness and small preload of the first spring 18, it is compressed first, and the extrusion piece 14 moves upward accordingly, and the valve opens. At this time, the first spring 18 provides less resistance to allow the valve to respond quickly to a small overpressure. As the pressure continues to rise, the compression of the first spring 18 increases, and the second spring 19 begins to be compressed by the upward force of the extrusion piece 14. At this time, the extrusion piece 14 moves upward until the valve is fully opened to achieve large-flow discharge; when the system pressure drops, the second spring 19 has a larger elastic force and pushes the extrusion piece 14 downward first. When the pressure further decreases, the first spring 18 continues to assist, and the two springs act in sequence to make the extrusion piece 14 move down smoothly and close the valve to avoid impact.

[0026] See attached Figure 4 -Attached Figure 6 The indicating assembly includes a connecting member 15, which is fixedly connected to the extrusion member 14. A rack 16 is fixedly connected to the top of the connecting member 15, a gear 17 is meshed with the front side of the rack 16, and a pointer 20 is fixedly connected to the right end of the gear 17.

[0027] Specifically, when the valve is opened or closed due to pressure changes, the extrusion piece 14 drives the connecting piece 15 to move synchronously, driving the rack 16 fixed on the top to move, and the gear 17 engaged in front of the rack 16 rotates under the drive of the rack 16. At this time, the pointer 20 rotates to point to different positions. The user does not need to use complex detection tools, but can understand the degree of opening of the valve in real time by observing the position of the pointer 20 with the naked eye, quickly judge the working status of the valve, greatly improve the efficiency of on-site inspections, provide an intuitive basis for accurate valve operation, and ensure stable operation of the system.

[0028] See attached Figure 6 and attached Figure 7 The right side of the housing 4 is fixedly connected to a connection box 5. Slide grooves 24 are provided on both sides of the inner wall of the connection box 5. The rack 16 slides in the two slide grooves 24. A scale line 21 is provided on the right side of the connection box 5.

[0029] Specifically, when the valve is opened or closed, causing the extrusion member 14 to move, the connecting member 15 connected thereto drives the rack 16 to move synchronously, and the rack 16 slides smoothly in the slide grooves 24 opened on both sides of the inner wall of the connecting box 5 to ensure the accuracy of the movement direction. The movement of the rack 16 drives the gear 17 and the pointer 20 engaged therewith to rotate, and the pointer 20 points to different positions of the scale line 21. The user observes the position of the pointer 20 corresponding to the scale line 21, and can intuitively know the current opening degree of the valve without the need for additional tools for detection. This not only improves the inspection efficiency, but also can accurately control the valve status and ensure smooth operation of the system.

[0030] See attached Figure 2 -Attached Figure 4 The top inner diameter of the housing 4 is fixedly connected to an electric push rod 10, the output end of the electric push rod 10 is fixedly provided with a moving part 11, the inner diameter of the moving part 11 is slidably connected to a slide rod 12, and the bottom end of the slide rod 12 is fixedly connected to the sliding column 25.

[0031] Specifically, when manual control of the valve is required, the user controls the electric push rod 10 to pull the moving part 11. At this time, the slide rod 12 is driven by the moving part 11, thereby driving the sliding column 25 and the extrusion part 14 to move. The movement of the extrusion part 14 causes the valve to open or close, thereby achieving the purpose of manual control of the valve. In the event of an emergency such as emergency venting, the user can quickly control the electric push rod 10 to quickly open the valve to avoid equipment damage or production interruption due to pressure out of control. In the daily stable operation stage when manual operation is not required, the slide rod 12 can slide in the moving part 11, and the valve can rely on the first spring 18 and the second spring 19 to automatically adjust, which increases the flexibility and reliability of valve control and allows users to better control the valve status under different working conditions to ensure the safe and stable operation of the system.

[0032] See attached Figure 5 and attached Figure 8The inner wall of the extrusion piece 14 is fixedly connected with a plurality of disc springs 23, and the bottom of the fixed ring 13 is fixedly connected with a buffer ring 22.

[0033] Specifically, when the valve needs to be closed after opening and pressure relief, the extrusion piece 14 moves towards the valve seat 2. At this time, the buffer ring 22 contacts the diaphragm 9, the buffer ring 22 is deformed under pressure, the initial impact is buffered, then the plurality of disc springs 23 fixedly connected to the inner wall of the extrusion piece 14 are compressed, further absorbing kinetic energy, avoiding hard collision between the extrusion piece 14 and the valve seat 2, reducing the wear of the diaphragm 9, reducing the maintenance frequency, prolonging the service life of the valve, enhancing the reliability and adaptability of the valve under complex working conditions, and ensuring the continuous and stable operation of the system.

[0034] Referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 7 The inner diameter of the valve body 1 on the right side is fixedly connected with a fixed plate 8, the right side of the fixed plate 8 is rotatably connected with a rotating rod 6, and the surface of the rotating rod 6 is fixedly connected with a plurality of blades 7.

[0035] Specifically, when the medium flows through, it will impact the blades 7, causing the blades 7 to rotate, thereby causing the medium to form a vortex flow and rush into the valve. Due to the low central pressure and high peripheral pressure of the vortex flow, a large pressure difference is generated on the diaphragm 9. This pressure difference drives the extrusion piece 14 to overcome the resistance and quickly open the valve for pressure relief. When the valve is closed after pressure relief is completed, the pressure relief efficiency can be effectively improved, the system overpressure situation can be quickly responded to, the system safety can be ensured, and at the same time, this vortex flow assisted valve opening method can also avoid damage to the valve parts caused by excessive impact force during the opening process, thereby prolonging the service life of the valve.

[0036] Referring to the accompanying drawings Figure 6 and the accompanying drawings Figure 7 The gear 17 is rotatably connected between the inner wall of the connecting box 5, and the right side of the pointer 20 penetrates and extends to the right side of the connecting box 5, and the pointer 20 is rotatably connected between the connecting box 5.

[0037] Specifically, the gear 17 stably rotates under the drive of the rack 16, providing stable support for the rotation of the connecting box 5 and the pointer 20, making the rotation of the pointer 20 more accurate, and allowing the user to see the indication position of the pointer 20, thereby facilitating reading of the scale.

[0038] Referring to the accompanying drawings Figure 4 and the accompanying drawings Figure 5 The first spring 18 has a rigidity of 3-8 N / mm, the second spring 19 has a rigidity of 80-150 N / mm, the first spring 18 has a pre-tightening force of 80-300 N, the second spring 19 has a pre-tightening force of 800-2000 N, and the length of the first spring 18 is greater than that of the second spring 19.

[0039] Specifically, the spring coefficient of the second spring 19 is greater than that of the first spring 18, and it can withstand greater external forces. The length of the first spring 18 is greater than that of the second spring 19, so that at the initial stage of valve opening, the first spring 18 takes effect first, and uses its smaller stiffness and preload force to allow the valve to be opened more easily. As the valve opening degree increases, after the first spring 18 is compressed to a certain extent, the second spring 19 begins to take effect. With its larger stiffness and preload force, it provides a stronger closing force for the valve, ensuring that the valve works stably under different pressure conditions, preventing the valve from being over-opened or loosely closed, and improving the sealing and reliability of the valve to adapt to the discharge requirements of different pressure media and ensure safe and stable operation of the system.

[0040] See attached Figure 8 The extrusion piece 14 is made of nickel-based alloy, and the buffer ring 22 is made of silicone rubber.

[0041] Specifically, the extrusion 14 is made of nickel-based alloy, which has good corrosion resistance, high temperature resistance and high strength. It can maintain stable performance in complex working environments, resist the erosion of the medium and the effects of high pressure, and ensure the normal operation and long-term service life of the valve. The buffer ring 22 is made of silicone rubber, which has excellent elasticity, flexibility and shock absorption performance. It can effectively absorb the impact force generated when the extrusion 14 moves, reduce wear and collision between components, and improve the stability and reliability of the valve. At the same time, silicone rubber also has good aging resistance and chemical resistance, and can adapt to the environment of different media.

[0042] See attached Figure 3 and attached Figure 4 The diaphragm 9 is composed of high-temperature resistant nickel-based alloy fibers and fluorosilicone rubber. The high-temperature resistant nickel-based alloy fibers are woven into a grid-like base structure, and the fluorosilicone rubber is filled in the gaps of the grid-like base structure.

[0043] Specifically, the high-temperature resistant nickel-based alloy fiber has excellent high-temperature resistance, high strength and good corrosion resistance, can maintain structural stability in high-temperature environments, and withstand high pressure, while fluorosilicone rubber has excellent elasticity, flexibility and sealing performance, and also has good chemical resistance and aging resistance. Combining the two, the diaphragm 9 can not only withstand the influence of high-temperature media, but also rely on the characteristics of fluorosilicone rubber to achieve a good sealing effect, effectively isolate different media, and at the same time use its elasticity to adapt to pressure changes and component movements during the operation of the valve, ensure the normal operation of the valve, extend its service life, and improve the adaptability and reliability of the valve under high-temperature and complex working conditions.

[0044] The above-mentioned diaphragm type high temperature resistant vent valve has the following working steps: when the device is started, the medium pressure in the system acts on the valve seat 2. Within the normal operating pressure range, the first spring 18 and the second spring 19 push the extrusion piece 14 toward the valve seat 2, so that the valve remains closed, effectively preventing medium leakage. As the device is running, if the system pressure gradually rises, the medium pressure first overcomes the smaller stiffness and preload of the first spring 18, the extrusion piece 14 moves upward, the first spring 18 is compressed, the diaphragm 9 deforms and the valve opens. At this time, the valve can respond quickly to smaller overpressure conditions and allow a small amount of medium to pass through. As the system pressure increases, the first spring 18 and the second spring 19 push the extrusion piece 14 toward the valve seat 2, so that the valve remains closed, effectively preventing medium leakage. The compression amount of the spring 18 continues to increase. When the pressure reaches a certain level, the second spring 19 also begins to be compressed by the upward force of the extrusion piece 14. The first spring 18 and the second spring 19 jointly push the extrusion piece 14 to continue to move upward until the valve is fully opened, achieving large-flow discharge and meeting the system's emergency pressure relief needs. When the system pressure drops, the second spring 19, due to its greater elastic force, first pushes the extrusion piece 14 downward. As the pressure further decreases, the first spring 18 also plays a role. The two springs operate in sequence to make the extrusion piece 14 move downward smoothly, closing the valve to avoid damage to the valve components due to the impact of sudden closing. At the same time, if manual intervention is required to change the valve status during the operation of the device, the user can operate the electric push rod 10 to drive the moving part 11 to move. Driven by the moving part 11, the slide rod 12 pulls the sliding column 25 and the extrusion part 14 to manually open or close the valve. During the process of opening or closing the valve, the movement of the extrusion member 14 drives the connection member 15 and the rack 16 to move. The rack 16 slides in the slide groove 24 to drive the gear 17 to rotate. At this time, the pointer 20 also rotates to point to the scale line 21. The device operator can intuitively understand the degree of valve opening by observing the position of the pointer 20, which is convenient for timely grasping the valve status during the operation of the device. When the medium flows through the valve body 1 on the right side, it will impact the blade 7 on the rotating rod 6 that is connected to the right side of the fixed plate 8. The blade 7 is forced to rotate, causing the medium to form a vortex flow and rush into the valve. The pressure at the center of the vortex flow is low and the pressure around it is high, which produces a large pressure difference on the diaphragm 9, driving the extrusion piece 14 to overcome the resistance and quickly open the valve to relieve pressure, thereby improving the pressure relief efficiency and ensuring the safety of the system. In the valve closing stage, the extrusion piece 14 moves toward the valve seat 2, and the buffer ring 22 at the bottom of the fixed ring 13 first contacts the extrusion piece 14 and is deformed by pressure to cushion the initial impact. Subsequently, the disc spring 23 on the inner wall of the extrusion piece 14 is compressed to further absorb kinetic energy, avoid hard collision between the extrusion piece 14 and the valve seat 2, reduce wear of components such as the diaphragm 9, and ensure long-term stable operation of the device.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm-type high-temperature resistant vent valve, comprising a valve seat (2), characterized in that: The bottom of the valve seat (2) is fixedly connected to a plurality of valve bodies (1), the top of the valve seat (2) is fixedly connected to a connecting plate (3), the interior of the connecting plate (3) is fixedly connected to a diaphragm (9), the top of the connecting plate (3) is fixedly connected to a housing (4), the inner diameter of the housing (4) is fixedly connected to a fixing ring (13), the inner diameter of the fixing ring (13) is slidably connected to a sliding column (25), the bottom end of the sliding column (25) is fixedly connected to an extrusion piece (14), a first spring (18) is fixedly connected between the extrusion piece (14) and the fixing ring (13), a second spring (19) is arranged inside the first spring (18), the top end of the second spring (19) is fixedly connected to the fixing ring (13), and an indicator assembly is arranged on the right side of the extrusion piece (14).

2. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: The indicating assembly comprises a connecting member (15), the connecting member (15) being fixedly connected to the extrusion member (14), a rack (16) being fixedly connected to the top of the connecting member (15), a gear (17) being meshedly connected to the front side of the rack (16), and a pointer (20) being fixedly connected to the right end of the gear (17).

3. The diaphragm type high temperature resistant vent valve according to claim 2, characterized in that: A connection box (5) is fixedly connected to the right side of the housing (4), and sliding grooves (24) are provided on both left and right sides of the inner wall of the connection box (5). The rack (16) slides in the two sliding grooves (24), and a scale line (21) is provided on the right side of the connection box (5).

4. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: The top end of the inner diameter of the housing (4) is fixedly connected to an electric push rod (10), the output end of the electric push rod (10) is fixedly provided with a moving part (11), the inner diameter of the moving part (11) is slidably connected to a sliding rod (12), and the bottom end of the sliding rod (12) is fixedly connected to the sliding column (25).

5. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: A plurality of disc springs (23) are fixedly connected to the inner wall of the extrusion piece (14), and a buffer ring (22) is fixedly connected to the bottom of the fixing ring (13).

6. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: The inner diameter of the valve body (1) on the right side is fixedly connected to a fixed plate (8), the right side of the fixed plate (8) is rotatably connected to a rotating rod (6), and the surface of the rotating rod (6) is fixedly connected to a plurality of blades (7).

7. The diaphragm type high temperature resistant vent valve according to claim 2, characterized in that: The gear (17) is rotationally connected to the inner wall of the connection box (5), the right side of the pointer (20) passes through and extends to the right side of the connection box (5), and the pointer (20) is rotationally connected to the connection box (5).

8. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: The stiffness of the first spring (18) is 3-8 N / mm, the stiffness of the second spring (19) is 80-150 N / mm, the preload force of the first spring (18) is 80-300 N, the preload force of the second spring (19) is 800-2000 N, and the length of the first spring (18) is greater than that of the second spring (19).

9. The diaphragm type high temperature resistant vent valve according to claim 5, characterized in that: The extrusion piece (14) is made of a nickel-based alloy, and the buffer ring (22) is made of a silicone rubber.

10. The diaphragm type high temperature resistant vent valve according to claim 1, characterized in that: The diaphragm (9) is composed of high-temperature resistant nickel-based alloy fibers and fluorosilicone rubber, the high-temperature resistant nickel-based alloy fibers are woven into a grid-like base structure, and the fluorosilicone rubber is filled in the gaps of the grid-like base structure.

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