Double-membrane pressure release valve structure

Abstract

The utility model relates to the technical field of pressure release valves, and discloses a double-membrane pressure release valve structure, which comprises an outer membrane main body, an adjusting mechanism and a pressure release mechanism, the pressure release mechanism comprises a mounting seat, the bottom end of the mounting seat is fixedly connected with the top end of the outer membrane main body through a bolt, the top end of the mounting seat is provided with a pressure release port, and the outer membrane main body is fixedly connected with the pressure release port. The top end of the mounting base is fixedly connected with a cavity shell through a bolt, the bottom end of the cavity shell is fixedly connected with a diaphragm, a gap is reserved between the top end of the diaphragm and the inner wall of the top end of the cavity shell to form an air chamber, a sealing plate is fixedly connected to the position, corresponding to the pressure relief opening, of the top end of the diaphragm, and a supporting column is arranged at the position, corresponding to the bolt, of the bottom end of the cavity shell; the supporting column is used for supporting the cavity shell to ensure that a gap is reserved between the bottom end of the cavity shell and the top end of the mounting seat; the utility model provides a double-membrane pressure relief valve structure which can prevent a pressure relief structure from being opened and closed suddenly, reduce impact force and flexibly adjust the pressure value during pressure relief at the same time.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief valve technology, and more specifically to a double-diaphragm pressure relief valve structure. Background Technology

[0002] The main functions of a double-membrane gas storage tank include storing and regulating gases, ensuring a stable gas supply, and adapting to various environmental conditions. Specifically, double-membrane gas storage tanks are suitable for storing gases such as biogas, air, carbon dioxide, and oxygen, and are widely used in industrial, energy, and environmental protection fields. A double-membrane gas storage tank mainly consists of a bottom membrane, an inner membrane, an outer membrane, a constant pressure control cabinet, and safety protectors. The bottom membrane, inner membrane, and outer membrane together form two spaces. The space between the inner membrane and the bottom membrane forms a variable-capacity, airtight space for gas storage. To prevent damage caused by excessive internal pressure during use, a pressure relief valve is installed on the outer membrane. When the internal pressure of the outer membrane becomes too high, the internal gas is discharged to relieve the pressure and prevent damage.

[0003] The shortcomings of existing technology: The inner and outer membranes in the dual-membrane gas storage tank have a certain degree of elasticity and are prone to deformation. During use, sudden pressure changes can easily occur in the outer membrane, which can cause sudden pressure changes in the pressure relief structure. Existing pressure relief structures are prone to impact damage to the outer membrane when faced with sudden pressure changes and sudden start-stop of the pressure relief structure. Furthermore, the pressure value cannot be flexibly adjusted during pressure relief, resulting in poor flexibility. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a double-diaphragm pressure relief valve structure to solve the problems existing in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-diaphragm pressure relief valve structure, comprising an outer diaphragm body, and further comprising: an adjustment mechanism and a pressure relief mechanism. The top end of the outer diaphragm body is fixedly connected to the bottom end of the pressure relief mechanism, and the inner wall of the top end of the pressure relief mechanism is movably connected to the top end of the adjustment mechanism. The pressure relief mechanism includes a mounting base, the bottom end of which is fixedly connected to the top end of the outer diaphragm body by bolts. The top end of the mounting base is provided with a pressure relief port, and a cavity shell is fixedly connected to the top end of the mounting base by bolts. A diaphragm is fixedly connected to the bottom end of the cavity shell, and a gap is left between the top end of the diaphragm and the inner wall of the top end of the cavity shell to form an air chamber. The bottom end of the diaphragm is movably connected to the top end of the pressure relief port. A through groove is opened at the top end of the outer diaphragm body corresponding to the position of the pressure relief port. A sealing plate is fixedly connected at the top end of the diaphragm corresponding to the position of the pressure relief port. A support column is provided at the bottom end of the cavity shell corresponding to the bolt position, and the support column is used to support the cavity shell to ensure that a gap is left between the bottom end of the cavity shell and the top end of the mounting base.

[0006] Furthermore, the top of the diaphragm is provided with micropores, and the micropores are located outside the pressure relief port.

[0007] Furthermore, the adjustment mechanism includes a mounting plate, a pressure spring is fixedly connected to the bottom end of the mounting plate, the bottom end of the pressure spring is fixedly connected to the top end of the sealing plate, and a threaded rod is movably sleeved on the top end of the mounting plate, the side of the threaded rod being threadedly connected to the inner wall of the side of the cavity shell.

[0008] Furthermore, a hexagonal groove is provided at the top of the threaded rod, and a fixing nut is threadedly connected to the side of the threaded rod.

[0009] Furthermore, a limiting rod is fixedly connected to the top of the sealing plate at the position corresponding to the pressure spring, and a limiting hole is opened at the top of the mounting plate, with the side of the limiting hole movably connected to the side of the limiting rod.

[0010] Furthermore, a sleeve is fixedly connected to the top surface of the mounting plate at the position corresponding to the limiting hole. The inner side wall of the sleeve is movably connected to the side of the limiting rod. A through hole is opened at the top of the cavity shell, and the side of the through hole is movably connected to the side of the sleeve.

[0011] Furthermore, the sleeve has graduations on its side.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] 1. This utility model utilizes the elasticity of the diaphragm itself and the thrust generated by the adjustment mechanism to ensure that the diaphragm and sealing plate are tightly attached to the pressure relief port, keeping the outer membrane body sealed. When the internal pressure of the outer membrane body increases, the upward pressure on the diaphragm increases, pushing the diaphragm upward and creating a gap between the pressure relief port and the diaphragm. The air inside the outer membrane body is then exhausted through the gap between the cavity shell and the mounting base. Simultaneously, the air pressure inside the chamber formed by the cavity shell and the diaphragm increases during the upward movement of the diaphragm, generating a downward resistance on the diaphragm and preventing the diaphragm from suddenly moving upward and generating impact force. After the internal pressure of the outer membrane body recovers, the adjustment mechanism and the elasticity of the diaphragm itself push the diaphragm upward to re-block the pressure relief port, which helps improve equipment safety.

[0014] 2. This utility model features micropores at the top of the diaphragm, located outside the pressure relief port. The micropores have a small diameter and slow exhaust speed. Therefore, when the diaphragm suddenly moves upward, the pressure in the air chamber formed by the diaphragm and the cavity increases, creating downward resistance. During prolonged exhaust and pressure relief by the outer membrane body, the gas inside the air chamber formed by the cavity and diaphragm is discharged, restoring the external ambient pressure. As exhaust continues, the gas inside the cavity is discharged through the micropores, reducing the internal pressure and increasing the distance between the diaphragm and the pressure relief port, thus increasing the exhaust speed and ensuring exhaust efficiency. When the internal pressure of the outer membrane body suddenly decreases, the adjusting mechanism and the elasticity of the diaphragm itself push the diaphragm downward, increasing the volume of the air chamber formed by the cavity and diaphragm, thereby reducing the internal pressure and creating upward resistance on the diaphragm. This effectively prevents sudden up-and-down movement of the diaphragm, reducing the impact on the equipment and ensuring efficient exhaust and pressure relief.

[0015] 3. This utility model involves inserting a hexagonal wrench into a hexagonal slot to rotate a threaded rod. The threaded rod then pushes the mounting plate up and down, thereby adjusting the distance between the mounting plate and the sealing plate. This adjusts the deformation of the pressure spring, controlling the pressure of the pressure spring pushing the sealing plate. The sleeve slides along the through hole as the mounting plate moves. The pressure value of the pressure relief mechanism after adjustment is determined by a scale. Finally, the fixing nut is tightened to fix the threaded rod, which improves the flexibility of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0017] Figure 2 For the present utility model Figure 1 Schematic diagram of the structure at point A;

[0018] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 4 For the present utility model Figure 3 Schematic diagram of the structure at point B;

[0020] Figure 5 This is a schematic diagram of the diaphragm structure of this utility model.

[0021] The attached figures are labeled as follows: 1. Outer membrane body; 2. Adjustment mechanism; 201. Mounting plate; 202. Threaded rod; 203. Fixing nut; 204. Sleeve; 205. Limiting rod; 206. Pressure spring; 207. Hexagonal groove; 208. Scale; 209. Limiting hole; 3. Pressure relief mechanism; 301. Mounting base; 302. Cavity shell; 303. Support column; 304. Diaphragm; 305. Sealing plate; 306. Through hole; 307. Micropore; 308. Pressure relief port. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The dual-diaphragm pressure relief valve structure involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Reference Figures 1 to 5This utility model provides a double-diaphragm pressure relief valve structure, including an outer diaphragm body 1, and further including an adjusting mechanism 2 and a pressure relief mechanism 3. The top end of the outer diaphragm body 1 is fixedly connected to the bottom end of the pressure relief mechanism 3, and the inner wall of the top end of the pressure relief mechanism 3 is movably connected to the top end of the adjusting mechanism 2. The pressure relief mechanism 3 includes a mounting base 301, the bottom end of the mounting base 301 is fixedly connected to the top end of the outer diaphragm body 1 by bolts, the top end of the mounting base 301 is provided with a pressure relief port 308, and a cavity shell 302 is fixedly connected to the top end of the mounting base 301 by bolts. A diaphragm 304 is fixedly connected to the bottom end of the cavity shell 302, and the diaphragm 304... A gap is left between the top of 4 and the inner wall of the top of the cavity 302 to form an air chamber. The bottom of the diaphragm 304 is movably connected to the top of the pressure relief port 308. A through groove is opened on the top of the outer membrane body 1 corresponding to the position of the pressure relief port 308. A sealing plate 305 is fixedly connected to the top of the diaphragm 304 corresponding to the position of the pressure relief port 308. A support column 303 is provided at the bottom of the cavity 302 corresponding to the bolt position. The support column 303 is used to support the cavity 302 to ensure that there is a gap between the bottom of the cavity 302 and the top of the mounting base 301. The cavity 302 is installed on the top of the mounting base 301 by bolts, and the through groove is opened. The support column 303 supports the cavity shell 302, ensuring that the bottom of the cavity shell 302 is flush with the top of the pressure relief port 308. At this time, the diaphragm 304 remains flat, and a sufficient gap is reserved between the bottom of the cavity shell 302 and the top of the mounting base 301 for ventilation. Then, the mounting base 301 is fixed to the reserved through groove of the outer membrane body 1 using bolts. When the internal air pressure of the outer membrane body 1 is normal, the elasticity of the diaphragm 304 itself and the adjusting mechanism 2 generate thrust, causing the diaphragm 304 and the sealing plate 305 to adhere tightly to the pressure relief port 308, keeping the outer membrane body 1 sealed. When the internal pressure of the outer membrane body 1 increases, the diaphragm 304 and the sealing plate 305 are pressed tightly against the pressure relief port 308, keeping the outer membrane body 1 sealed. When the internal pressure of the outer membrane body 1 increases, the diaphragm 304 is pressed against the pressure relief port 308. The increased upward pressure on the diaphragm 304 pushes it upward, creating a gap between the pressure relief port 308 and the diaphragm 304. Air inside the outer membrane body 1 is exhausted through the gap between the cavity shell 302 and the mounting base 301. At the same time, the air pressure inside the chamber formed by the cavity shell 302 and the diaphragm 304 increases as the diaphragm 304 moves upward, generating a downward resistance on the diaphragm 304 to prevent the diaphragm 304 from suddenly moving upward and generating an impact force. After the internal pressure of the outer membrane body 1 is restored, the adjusting mechanism 2 and the elasticity of the diaphragm 304 itself push the diaphragm 304 upward to block the pressure relief port 308 again.

[0024] The diaphragm 304 has a micropore 307 at its top, located outside the pressure relief port 308. The micropore 307 has a small diameter and slow airflow rate. Therefore, when the diaphragm 304 suddenly moves upward, the pressure in the air chamber formed by the diaphragm 304 and the cavity shell 302 increases, creating downward resistance to the diaphragm 304. During prolonged depressurization of the outer membrane body 1, the gas inside the air chamber formed by the cavity shell 302 and the diaphragm 304 is discharged, restoring the external ambient pressure. As depressurization continues, the gas inside the cavity shell 302 passes through the micropore 307. 07. When the internal air pressure of the discharge chamber 302 decreases, the distance between the diaphragm 304 and the pressure relief port 308 increases, the exhaust speed increases, and the exhaust efficiency is ensured. When the internal air pressure of the outer membrane body 1 suddenly decreases, the adjustment mechanism 2 and the elasticity of the diaphragm 304 itself push the diaphragm 304 to move downward, which increases the volume of the air chamber formed by the chamber 302 and the diaphragm 304, thereby reducing the internal air pressure and generating an upward resistance on the diaphragm 304. This effectively prevents the diaphragm 304 from moving up and down suddenly and reduces the impact force on the equipment.

[0025] The adjusting mechanism 2 includes a mounting plate 201. A pressure spring 206 is fixedly connected to the bottom end of the mounting plate 201. The bottom end of the pressure spring 206 is fixedly connected to the top end of the sealing plate 305. A threaded rod 202 is movably sleeved on the top end of the mounting plate 201. The side of the threaded rod 202 is threadedly connected to the inner wall of the side of the cavity shell 302. According to the usage requirements, rotating the threaded rod 202 causes the threaded rod 202 to push the mounting plate 201 up and down through the thread, thereby adjusting the distance between the mounting plate 201 and the sealing plate 305, adjusting the deformation of the pressure spring 206, thereby controlling the pressure of the pressure spring 206 pushing the sealing plate 305, and realizing pressure regulation during pressure relief.

[0026] The threaded rod 202 has a hexagonal groove 207 at its top end and a fixing nut 203 threaded to its side. When the adjustment mechanism 2 needs to be adjusted, loosen the fixing nut 203, insert a hexagonal wrench into the hexagonal groove 207 to rotate the threaded rod 202, and tighten the fixing nut 203 to fix the threaded rod 202 after adjustment.

[0027] The top of the sealing plate 305 is fixedly connected to the pressure spring 206 with a limit rod 205. The top of the mounting plate 201 has a limit hole 209. The side of the limit hole 209 is movably connected to the side of the limit rod 205. When the sealing plate 305 moves up and down, the limit rod 205 moves up and down along the limit hole 209 to ensure that the sealing plate 305 is always above and aligned with the pressure relief port 308, and to ensure that the sealing plate 305 can block the pressure relief port 308.

[0028] The mounting plate 201 has a sleeve 204 fixedly connected to the top surface of the mounting plate 201 at the position corresponding to the limiting hole 209. The inner side wall of the sleeve 204 is movably connected to the side of the limiting rod 205. The top of the cavity shell 302 has a through hole 306, and the side of the through hole 306 is movably connected to the side of the sleeve 204. When the mounting plate 201 moves up and down, the sleeve 204 slides along the through hole 306 to limit the mounting plate 201 and prevent the mounting plate 201 from rotating with the threaded rod 202.

[0029] The sleeve 204 has a scale 208 on its side. The scale 208 is used to determine the pressure value when the pressure relief mechanism 3 releases pressure after the adjustment mechanism 2 is adjusted, so as to facilitate the adjustment of the equipment.

[0030] The working principle of this utility model is as follows: The cavity shell 302 is installed on the top of the mounting base 301 by bolts, and the cavity shell 302 is supported by the support column 303, so that the bottom end of the cavity shell 302 is flush with the top end of the pressure relief port 308. At this time, the diaphragm 304 remains flat, and a sufficient gap is reserved between the bottom end of the cavity shell 302 and the top end of the mounting base 301 for ventilation. Then, the mounting base 301 is fixed above the reserved through groove of the outer membrane body 1 by bolts. According to the usage requirements, the fixing nut 203 is loosened, and the hexagonal wrench is inserted into the hexagonal slot 207 to drive the threaded rod 202 to rotate. The threaded rod 202 rotates through the thread. 02. Push the mounting plate 201 up and down to adjust the distance between the mounting plate 201 and the sealing plate 305, and adjust the deformation of the pressure spring 206 to control the pressure of the pressure spring 206 pushing the sealing plate 305. The sleeve 204 slides along the through hole 306 as the mounting plate 201 moves, and the pressure value when the pressure relief mechanism 3 releases pressure after the adjustment mechanism 2 is adjusted is determined by the scale 208. Then, tighten the fixing nut 203 to fix the threaded rod 202. When the internal air pressure of the outer membrane body 1 is normal, the diaphragm 304 itself has elasticity and the pressure spring 206 generate thrust to make the diaphragm 304 and the sealing plate 305 close. The sealing plate 305 is tightly attached above the pressure relief port 308, keeping the outer membrane body 1 sealed. When the internal pressure of the outer membrane body 1 increases, the upward pressure on the diaphragm 304 increases more than the pressure spring 206 and the diaphragm 304, generating a downward force that pushes the diaphragm 304 upward, creating a gap between the pressure relief port 308 and the diaphragm 304. Air inside the outer membrane body 1 is then exhausted through the gap between the cavity shell 302 and the mounting base 301. Simultaneously, the air pressure inside the chamber formed by the cavity shell 302 and the diaphragm 304 increases as the diaphragm 304 moves upward, creating a downward resistance on the diaphragm 304 and preventing the diaphragm 304 from collapsing. The sudden upward movement generates an impact force. As the exhaust proceeds, the gas inside the cavity shell 302 is discharged through the micropores 307, reducing the internal air pressure of the cavity shell 302. This increases the distance between the diaphragm 304 and the pressure relief port 308, increasing the exhaust speed and ensuring exhaust efficiency. After the internal pressure of the outer membrane body 1 recovers, the pressure spring 206 and the elastic force of the diaphragm 304 itself push the diaphragm 304 downward, increasing the volume of the air chamber formed by the cavity shell 302 and the diaphragm 304. This reduces the internal air pressure, creating an upward resistance on the diaphragm 304, effectively preventing the diaphragm 304 from suddenly moving up and down and reducing the impact force on the equipment.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-diaphragm pressure relief valve structure, comprising an outer diaphragm body (1), characterized in that, Also includes: The adjustment mechanism (2) and the pressure relief mechanism (3) are provided. The top end of the outer membrane body (1) is fixedly connected to the bottom end of the pressure relief mechanism (3). The inner wall of the top end of the pressure relief mechanism (3) is movably connected to the top end of the adjustment mechanism (2). The pressure relief mechanism (3) includes a mounting base (301). The bottom end of the mounting base (301) is fixedly connected to the top end of the outer membrane body (1) by bolts. The top end of the mounting base (301) is provided with a pressure relief port (308). The top end of the mounting base (301) is fixedly connected to a cavity shell (302) by bolts. The bottom end of the cavity shell (302) is fixedly connected to a diaphragm (304). The diaphragm (304) is fixedly connected to the bottom end of the cavity shell (302). A gap is left between the top of the diaphragm (304) and the top inner wall of the cavity shell (302) to form an air chamber. The bottom of the diaphragm (304) is movably connected to the top of the pressure relief port (308). A through groove is opened at the top of the outer membrane body (1) corresponding to the position of the pressure relief port (308). A sealing plate (305) is fixedly connected at the top of the diaphragm (304) corresponding to the position of the pressure relief port (308). A support column (303) is provided at the bottom of the cavity shell (302) corresponding to the bolt position. The support column (303) is used to support the cavity shell (302) to ensure that there is a gap between the bottom of the cavity shell (302) and the top of the mounting base (301).

2. The dual-diaphragm pressure relief valve structure according to claim 1, characterized in that: The diaphragm (304) has a micropore (307) at its top end, and the micropore (307) is located outside the pressure relief port (308).

3. The structure of a double-diaphragm pressure relief valve according to claim 1, characterized in that: The adjustment mechanism (2) includes a mounting plate (201), a pressure spring (206) is fixedly connected to the bottom end of the mounting plate (201), the bottom end of the pressure spring (206) is fixedly connected to the top end of the sealing plate (305), and a threaded rod (202) is movably sleeved on the top end of the mounting plate (201), and the side of the threaded rod (202) is threadedly connected to the inner wall of the side of the cavity shell (302).

4. The structure of a double-diaphragm pressure relief valve according to claim 3, characterized in that: The top end of the threaded rod (202) is provided with a hexagonal groove (207), and the side of the threaded rod (202) is threaded with a fixing nut (203).

5. The structure of a double-diaphragm pressure relief valve according to claim 3, characterized in that: The top of the sealing plate (305) is fixedly connected to the position of the pressure spring (206) with a limiting rod (205). The top of the mounting plate (201) has a limiting hole (209). The side of the limiting hole (209) is movably connected to the side of the limiting rod (205).

6. The structure of a double-diaphragm pressure relief valve according to claim 5, characterized in that: A sleeve (204) is fixedly connected to the top surface of the mounting plate (201) at the position corresponding to the limiting hole (209). The inner side wall of the sleeve (204) is movably connected to the side of the limiting rod (205). A through hole (306) is opened at the top of the cavity shell (302). The side of the through hole (306) is movably connected to the side of the sleeve (204).

7. The structure of a double-diaphragm pressure relief valve according to claim 6, characterized in that: The sleeve (204) has a scale (208) on its side.

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