Back pressure adjusting structure of spring safety valve

Abstract

The utility model discloses a back pressure adjusting structure of a spring safety valve, which relates to the field of safety valve structures and comprises a valve clack matched with a valve seat to control medium flow; the back pressure cavity mechanism is used for adjusting pressure acting on the back face of the valve clack and controlling opening or closing of the valve clack; one end of the valve rod is connected with the valve clack, the other end of the valve rod is connected with the spring driving assembly, the valve rod penetrates through the backpressure cavity mechanism, and the valve rod can axially move in the valve body and drive the valve clack to move in the valve body; the adjusting part is arranged on the valve rod in a sleeving mode and can be driven by the valve rod to move, and the adjusting part is arranged to adjust the flow area between the back pressure cavity mechanism and a discharge channel of the external environment through movement; and the axial position of the adjusting part on the valve rod is adjustable. According to the embodiment of the utility model, the adjusting part which can be axially adjusted is arranged on the valve rod, so that the valve clack back pressure adjustment with different requirements is adapted, and the purpose of accurately controlling the valve clack to be opened or closed through accurate pressure is achieved.

Description

Technical Field

[0001] The utility model relates to the field of safety valve structures, and particularly to a backpressure regulating structure for a spring safety valve. Background Art

[0002] A spring safety valve is a crucial safety device widely used in various pressurized equipment, containers or pipeline systems. Its core function is to automatically release pressure when the system pressure rises abnormally, preventing equipment damage and accidents, and ensuring the safety of operators. This automatic pressure release mechanism is achieved through the opening and closing of the valve disc. The valve disc opens under overpressure to release pressure and closes when the pressure drops back within the safe range to maintain the normal operation of the system. When the internal pressure of the pressurized system rises and exceeds the preset safety value, the pressure acting on the valve disc exceeds the elastic force of the spring, pushing the valve disc away from the valve seat and opening the valve. After the valve opens, the excess medium is discharged through the opened valve, reducing the system pressure. As the system pressure decreases, the pressure acting on the valve disc decreases. When the pressure drops to the preset closing pressure of the spring, the elastic force of the spring pushes the valve disc to reseal with the valve seat and close the valve. The spring safety valve is the first line of defense against overpressure accidents, crucial for protecting equipment and personnel safety. By releasing pressure in a timely manner, it avoids equipment damage, reduces maintenance costs and production interruptions, and ensures economic benefits.

[0003] The spring safety valve will affect the closing of the valve disc due to changes in backpressure, and it will also cause the valve to remain open when it should be closed, unable to open or close at an accurate pressure point (such as the existing backpressure regulating valve of the spring safety valve shown Figure 1 ), resulting in insufficiently precise pressure control.

[0004] In view of this, this application is specifically proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a backpressure regulating structure for a spring safety valve, which can adapt to the backpressure adjustment of the valve disc for different requirements by setting an axially adjustable adjustment component on the valve stem, so as to solve the problem in the prior art that the opening or closing of the valve disc cannot be controlled at an accurate pressure point.

[0006] The embodiment of the utility model is realized by the following technical solutions: The embodiment of the utility model provides a backpressure regulating structure for a spring safety valve, including:

[0007] A valve disc, arranged in the valve body, cooperating with the valve seat to control the flow of the medium;

[0008] A backpressure chamber mechanism, arranged on the valve body, used to adjust the pressure acting on the back of the valve disc and control the opening or closing of the valve disc;

[0009] The valve stem is connected to the valve flap at one end and the spring drive assembly at the other end, and is arranged to penetrate through the back pressure chamber mechanism. The valve stem can axially move within the valve body and drive the valve flap to move within the valve body.

[0010] The adjustment component is sleeved on the valve stem and can be driven by the valve stem to move. The adjustment component is arranged to adjust the flow area between the back pressure chamber mechanism and the discharge channel of the external environment through movement.

[0011] The axial position of the adjustment component on the valve stem is adjustable.

[0012] Preferably, the adjustment component includes a conical part. The conical part is sleeved outside the valve stem, and the diameter of the conical part gradually decreases from the upper end to the lower end.

[0013] When the valve flap moves upward to open, the valve stem drives the adjustment component to move upward, the flow area between the back pressure chamber mechanism and the discharge channel of the external environment increases, and the pressure loss in the back pressure chamber mechanism increases.

[0014] When the valve flap moves downward to close, the valve stem drives the adjustment component to move downward, the flow area between the back pressure chamber mechanism and the discharge channel of the external environment decreases, and the pressure loss in the back pressure chamber mechanism decreases.

[0015] Preferably, the adjustment component further includes a connecting part. The connecting part is arranged to fixedly sleeve the conical part on the valve stem, and the conical part can slide on the valve stem.

[0016] Preferably, a transition part is provided at the upper end of the conical part. The transition part is sleeved outside the valve stem, and the diameter of the transition part is equal to the diameter of the upper end of the conical part; the transition part can slide on the valve stem.

[0017] The connecting part is connected to the upper end of the transition part, and the connecting part is used to fixedly install the conical part and the transition part at the preset position on the valve stem.

[0018] Preferably, the back pressure chamber mechanism includes a fixing plate provided at the top. The fixing plate is installed on the valve body. A through hole is provided on the fixing plate, and the valve stem is sleeved in the through hole. The upper size of the conical part is adapted to the size of the through hole.

[0019] Preferably, a flexible component is provided on the inner side wall of the through hole. The flexible component is used to isolate the adjustment component from the inner side wall of the through hole.

[0020] Preferably, a guiding mechanism is provided at the lower end of the fixing plate. The guiding mechanism includes a guiding hole, and the guiding hole is communicated with the through hole. The valve stem penetrates through the guiding hole.

[0021] Preferably, a number of flow holes are provided at the connection between the guiding mechanism and the fixing plate. The flow holes are arranged to communicate the inner cavity of the back pressure chamber mechanism with the bottom of the through hole.

[0022] Preferably, the size of the valve stem is adapted to the size of the guiding hole.

[0023] Preferably, the inner side wall of the conical part is arranged in contact with the valve stem.

[0024] Compared with the prior art, the embodiment of the present utility model has the following advantages and beneficial effects:

[0025] 1. For the backpressure adjustment structure of the spring safety valve provided by the embodiment of the present utility model, the valve flap and the valve seat are closely matched to form the sealing surface of the valve. The axial movement of the valve flap is driven by the valve stem to achieve the opening and closing actions. The backpressure chamber mechanism is arranged on the valve body and is opposite to the back of the valve flap. By adjusting the components, the pressure inside the backpressure chamber mechanism can be changed. One end of the valve stem is connected to the valve flap, and the other end is connected to the spring drive assembly. The valve stem passes through the backpressure chamber mechanism and can axially move inside the valve body to drive the valve flap to open or close. The adjustment component is sleeved on the valve stem, and the movement of the valve stem is used to drive the adjustment component. The movement of the adjustment component can adjust the flow area of the discharge channel between the backpressure chamber mechanism and the external environment, thereby adjusting the backpressure and the change rate of the backpressure. In the embodiment of the present utility model, the axial position of the adjustment component on the valve stem is adjustable, that is, the backpressure of the valve can be finely adjusted by changing the position of the adjustment component on the valve stem to adapt to different working conditions. The embodiment of the present utility model enables the spring safety valve to more precisely control the pressure release, improving the safety and reliability of the system. Through the fine adjustment function of the adjustment component, the operator can adjust the working state of the valve according to actual needs and optimize the performance of the valve.

[0026] 2. The adjustment component of the embodiment of the present utility model includes a conical part, the diameter of which gradually decreases from the upper end to the lower end, forming a conical structure. When the system pressure exceeds the set value, the valve flap moves upward under the action of the spring drive assembly to open the valve to release the pressure. At the same time, the valve stem drives the adjustment component to move upward. Since the gap between the conical part and the discharge channel becomes larger during the upward movement, the flow area between the backpressure chamber mechanism and the discharge channel of the external environment is increased. The increase in the flow area leads to an increase in the pressure loss inside the backpressure chamber mechanism, which helps the valve flap to open more smoothly and quickly release the pressure;

[0027] When the system pressure drops below the set value, the spring drive assembly pushes the valve flap downward to close the valve and prevent the medium from flowing out continuously. At the same time, the valve stem drives the adjustment component downward. During the downward movement of the cone part, the gap between it and the discharge channel becomes smaller, thereby reducing the flow area between the back pressure chamber mechanism and the discharge channel of the external environment. The reduction of the flow area leads to a decrease in the pressure loss in the back pressure chamber mechanism, which helps the valve flap to seal more tightly and ensures that there is no leakage in the closed state. This structure is simple, and the change of the flow area between the back pressure chamber mechanism and the discharge channel of the external environment is a gradual process, which further improves the accuracy of valve control and also improves the stability of the whole system.

[0028] 3. The discharge channel of the embodiment of the present invention is formed by the through hole on the fixed plate in the back pressure chamber mechanism. The through hole cooperates with the adjustment component and the valve stem to jointly achieve the precise adjustment of the pressure in the cavity of the back pressure chamber mechanism.

[0029] Generally speaking, the back pressure adjustment structure of the spring safety valve provided by the embodiment of the present invention sets an axially adjustable adjustment component on the valve stem to adapt to the back pressure adjustment of the valve flap back surface with different requirements, so as to achieve the purpose of precisely controlling the opening or closing of the valve flap through precise pressure. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of the back pressure regulating valve structure of the spring safety valve provided in the prior art;

[0032] Figure 2 Schematic diagram of the back pressure adjustment structure of the spring safety valve provided by the embodiment of the present invention;

[0033] Figure 3 Partial enlarged structural diagram of the installation of the adjustment component provided by the embodiment of the present invention;

[0034] Figure 4 Overall schematic diagram of the cone part and the transition part provided by the embodiment of the present invention.

[0035] Marks in the drawings and corresponding component names:

[0036] 1 - Valve flap, 2 - Valve seat, 3 - Back pressure chamber mechanism, 4 - Valve stem, 5 - Spring drive assembly, 6 - Adjusting component, 7 - Cone part, 8 - Connecting part, 9 - Transition part, 10 - Fixed plate, 11 - Through hole, 12 - Guiding mechanism, 13 - Guiding hole, 14 - Flow hole. Detailed implementation mode

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0039] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present utility model, it should be noted that the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. Embodiment

[0041] As Figure 2 shown, the embodiment of the present utility model provides a back pressure adjustment structure for a spring safety valve, including: a valve flap 1, arranged in the valve body and cooperating with the valve seat 2 to control the flow of the medium; a back pressure chamber mechanism 3, arranged on the valve body and used for adjusting the pressure acting on the back of the valve flap 1 to control the opening or closing of the valve flap 1; a valve stem 4, with one end connected to the valve flap 1 and the other end connected to the spring drive assembly 5, and penetrating through the back pressure chamber mechanism 3. The valve stem 4 can axially move in the valve body and drive the valve flap 1 to move in the valve body; an adjusting component 6, sleeved on the valve stem 4 and capable of moving after being driven by the valve stem 4. The adjusting component 6 is arranged to adjust the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment through movement; the axial position of the adjusting component 6 on the valve stem 4 is adjustable.

[0042] Specifically, the valve flap 1 is arranged inside the valve body, directly contacting the medium, cooperating with the valve seat 2, and opening or closing according to the change of the system pressure to control the flow of the medium. The backpressure chamber mechanism 3 is used to adjust the pressure acting on the back of the valve flap 1. By adjusting the backpressure, the movement of the valve flap 1 can be finely controlled, optimizing the response time and pressure control accuracy of the valve. The valve stem 4 is a mechanical component connecting the valve flap 1 and the spring drive assembly 5. It transmits force to open or close the valve flap 1. One end of the valve stem 4 is connected to the valve flap 1, the other end is connected to the spring drive assembly 5, and it penetrates through the backpressure chamber mechanism 3 and can axially move inside the valve body to drive the valve flap 1 to move inside the valve body. The adjustment component 6 is used to adjust the flow area between the backpressure chamber mechanism 3 and the discharge channel of the external environment. By changing the flow area, the backpressure is adjusted, thereby finely controlling the opening and closing of the valve flap 1. The adjustment component 6 is sleeved on the valve stem 4 and can be driven by the valve stem 4 to move. Its axial position on the valve stem 4 is adjustable, providing additional adjustment flexibility.

[0043] When the system pressure rises and exceeds the set value, the spring drive assembly 5 pushes the valve stem 4, and the valve stem 4 then pushes the valve flap 1 away from the valve seat 2 to open the valve and release the pressure. At the same time, the adjustment component 6 adjusts the flow area of the backpressure chamber mechanism 3 as needed to adapt to different pressure release requirements. By adjusting the position of the adjustment component 6, the flow area between the backpressure chamber mechanism 3 and the discharge channel of the external environment can be changed, thereby finely controlling the backpressure and optimizing the closing process of the valve flap 1 to ensure that the valve flap 1 can be closed in time when the pressure drops to the set value. The embodiment of the present utility model ensures rapid pressure release in the case of overpressure and timely closing after the pressure drops by precisely controlling the opening and closing of the valve flap 1, improving the safety of the system. Through the dynamic adjustment of the adjustment component 6, the delay in opening and closing the valve can be reduced, and the response speed of the system can be improved. The adjustable setting of the adjustment component 6 enables the operator to adjust the working state of the valve according to actual needs and optimize the performance of the valve.

[0044] Exemplarily, as Figure 3 and Figure 4 shown, the adjustment component 6 includes a cone part 7. The cone part 7 is sleeved outside the valve stem 4, and the diameter of the cone part 7 is a structure that gradually decreases from the upper end to the lower end; when the valve flap 1 moves upward to open, the valve stem 4 drives the adjustment component 6 to move upward, and the flow area between the backpressure chamber mechanism 3 and the discharge channel of the external environment increases, and the pressure loss in the backpressure chamber mechanism 3 increases; when the valve flap 1 moves downward to close, the valve stem 4 drives the adjustment component 6 to move downward, and the flow area between the backpressure chamber mechanism 3 and the discharge channel of the external environment decreases, and the pressure loss in the backpressure chamber mechanism 3 decreases.

[0045] Specifically, the diameter of the cone part 7 gradually decreases from the upper end to the lower end, forming a conical structure. When the system pressure exceeds the set safety value, the spring drive assembly 5 pushes the valve stem 4, and then pushes the valve flap 1 upward to open the valve to release the pressure. At the same time, the valve stem 4 drives the adjustment component 6 upward. Since the gap between the cone part 7 and the discharge channel increases during the upward movement, the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment increases. The increase in the flow area leads to an increase in the pressure loss in the back pressure chamber mechanism 3, which helps the valve flap 1 to open more smoothly and quickly release the pressure;

[0046] When the system pressure drops below the set value, the spring drive assembly 5 pushes the valve flap 1 downward to close the valve to prevent the medium from flowing out continuously. At the same time, the valve stem 4 drives the adjustment component 6 downward. The gap between the cone part 7 and the discharge channel decreases during the downward movement, thus reducing the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment. The reduction in the flow area leads to a decrease in the pressure loss in the back pressure chamber mechanism 3, which helps the valve flap 1 to seal more tightly and ensure no leakage in the closed state. This structure is simple, making the change in the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment a gradual process, further improving the accuracy of valve control and the stability of the entire system.

[0047] Furthermore, the adjustment component 6 further includes a connecting part 8. The connecting part 8 is arranged to fixedly sleeve the cone part 7 on the valve stem 4. The cone part 7 can slide on the valve stem 4. The function of the connecting part 8 is to fixedly sleeve the cone part 7 on the valve stem 4 to ensure that the cone part 7 is fixed on the valve stem 4 when it slides to the preset position on the valve stem 4, which not only ensures the flexible adjustability of the position of the cone part 7 but also ensures the stability during use. For example Figure 4As shown, as a preferred embodiment of the present invention, a transition portion 9 is provided at the upper end of the cone portion 7, and the transition portion 9 is sleeved on the outer side of the valve stem 4, and the diameter of the transition portion 9 is equal to the diameter of the upper end of the cone portion 7; the transition portion 9 can slide on the valve stem 4; the connecting portion 8 is connected to the upper end of the transition portion 9, and the connecting portion 8 is used to fix the cone portion 7 and the transition portion 9 at a preset position of the valve stem 4. The setting of the transition portion 9 can ensure smooth transition and stable sliding, and the transition portion 9 has a guiding function, which can improve the stability of the movement of the valve stem 4. At the same time, the height of the transition portion 9 can accurately adjust the opening and closing of the valve. In the embodiment of the present invention, the height of the transition portion 9 is not limited here, and can be set according to actual needs. At the same time, the connection method of the transition portion 9 and the cone portion 7 can be bonding, clamping, welding, etc., which is not limited here, and can even be set as a whole, as long as the purpose of sufficient connection stability can be achieved. The specific structure of the connecting portion 8 is not limited here, as long as the transition portion 9 and the cone portion 7 can be fixed at the preset position of the valve disc 1, the purpose of convenient adjustment can be achieved when adjustment is needed. For example, the connecting portion 8 can be a rubber fastening sleeve partially mounted on the transition portion, a rope connected to the transition portion and capable of being looped around the valve stem 4, or other existing mechanical structures with a fastening function, which will not be elaborated on here.

[0048] As a preferred embodiment of the present utility model, the back pressure chamber mechanism 3 includes a fixing plate 10 arranged on the top, the fixing plate 10 is mounted on the valve body, a through hole 11 is arranged on the fixing plate 10, the valve stem 4 is sleeved in the through hole 11, and the size of the upper end of the cone portion 7 is adapted to the size of the through hole 11. Specifically, the fixing plate 10 can withstand the force generated when the valve stem 4 moves. The through hole 11 is an opening on the fixing plate 10, which is arranged to allow the valve stem 4 to pass through and move in this hole. The size and shape of the through hole 11 are designed to be able to adapt to the valve stem 4, ensuring that the valve stem 4 can move freely in the through hole 11, and also ensuring the stability of the movement. That is, the discharge channel of the embodiment of the present utility model is formed by the through hole 11 on the fixing plate 10 in the back pressure chamber mechanism 3, and the through hole 11 cooperates with the adjustment component 6 and the valve stem 4 to realize the precise adjustment of the pressure in the cavity of the back pressure chamber mechanism 3. When the valve flap 1 needs to be opened, the spring drive assembly 5 pushes the valve flap 1 to move upward, and the valve stem 4 moves upward accordingly, driving the cone portion 7 to move upward. The adaptation between the upper end of the cone portion 7 and the through hole 11 enables the cone portion 7 to move freely in the through hole 11. When the cone portion 7 moves to the top and disengages from the through hole 11, if the cone portion 7 continues to move upward, the gap between the cone portion 7 and the inner wall of the through hole 11 will gradually increase, thereby gradually increasing the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment, increasing the pressure loss, and promoting the opening of the valve flap 1.

[0049] When the valve flap 1 needs to be closed, the spring drive assembly 5 pushes the valve flap 1 downward. The valve stem 4 moves downward accordingly, driving the cone part 7 downward until the entire cone part 7 enters the through hole 11. In the range of the position change of the cone part 7 from just entering the through hole 11 to the whole entering the through hole 11, the gap between the cone part 7 and the inner wall of the through hole 11 gradually decreases, so that the flow area between the back pressure chamber mechanism 3 and the discharge channel of the external environment gradually decreases, reducing the pressure loss, which helps the sealing and closing of the valve flap 1. Through the structural settings of the fixing plate 10 and the through hole 11, the precise control of the pressure in the back pressure chamber mechanism 3 is realized, improving the performance and reliability of the spring safety valve.

[0050] As a preferred embodiment of the present invention, a flexible component is provided on the inner side wall of the through hole 11. The flexible component is used to isolate the adjusting component 6 from the inner side wall of the through hole 11, reducing the direct contact between metals, thereby reducing the risk of wear and damage.

[0051] Furthermore, a guiding mechanism 12 is provided at the lower end of the fixing plate 10. The guiding mechanism 12 includes a guiding hole 13, and the guiding hole 13 communicates with the through hole 11. The valve stem 4 passes through the guiding hole 13. The guiding hole 13 communicates with the through hole 11, providing precise guiding and support for the valve stem 4, ensuring that the valve stem 4 can move freely therein, and at the same time providing sufficient guiding effect. The guiding hole 13 provides precise guiding for the valve stem 4, ensuring the linear movement of the valve stem 4 during operation, and improving the accuracy of valve opening and closing. It should be noted that the guiding mechanism 12 and the fixing plate 10 can be integrally provided, or can be connected by means of bonding, clamping, welding, etc. There is no limitation here, as long as the purpose of sufficient connection stability can be achieved. Preferably, the size of the valve stem 4 is adapted to the size of the guiding hole 13, which can improve the guiding efficiency. Of course, in order to further improve the control accuracy of the pressure in the cavity of the back pressure chamber mechanism 3, the inner side wall of the cone part 7 can be arranged in contact with the valve stem 4, which helps to form a seal, prevent the medium from leaking between the valve stem 4 and the cone part 7, and further improves the accuracy of valve operation, ensuring that the valve flap 1 can be opened and closed at the correct pressure point. A number of flow holes 14 are provided at the connection between the guiding mechanism 12 and the fixing plate 10. The flow holes 14 are arranged to connect the inner cavity of the back pressure chamber mechanism 3 with the bottom of the through hole 11 to ensure fluid exchange and pressure regulation. The number of the flow holes 14 is not limited here and can be specifically set according to actual needs.

[0052] Finally, it should be noted that the adjusting component 6 of the present invention is preferably a detachable adjusting component 6. Specifically, the side inclination angle, height of the cone part 7 and other parameters of the adjusting component 6 are not limited here, and different adjusting components 6 with different parameters can be replaced according to actual needs to achieve the effects of flexible use and precise control.

[0053] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the present utility model omits the description of well-known components and processing technologies and processes to avoid unnecessarily limiting the present utility model.

Claims

1. A backpressure adjustment structure for a spring safety valve, characterized in that, Comprising: A valve flap (1), arranged inside the valve body, cooperating with the valve seat (2) to control the flow of the medium; A back pressure chamber mechanism (3), arranged on the valve body, used to adjust the pressure acting on the back of the valve flap (1), and control the opening or closing of the valve flap (1); A valve stem (4), one end connected to the valve flap (1), the other end connected to a spring drive assembly (5), and passing through the back pressure chamber mechanism (3). The valve stem (4) can axially move inside the valve body and drive the valve flap (1) to move inside the valve body; An adjustment component (6), sleeved on the valve stem (4), capable of moving after being driven by the valve stem (4). The adjustment component (6) is arranged to adjust the flow area between the back pressure chamber mechanism (3) and the discharge channel of the external environment through movement; The axial position of the adjustment component (6) on the valve stem (4) is adjustable.

2. The back pressure adjusting structure of a spring safety valve according to claim 1, characterized in that, The adjustment component (6) includes a conical part (7), the conical part (7) is sleeved outside the valve stem (4), and the diameter of the conical part (7) gradually decreases from the upper end to the lower end; When the valve flap (1) moves upward to open, the valve stem (4) drives the adjustment component (6) to move upward, the flow area between the back pressure chamber mechanism (3) and the discharge channel of the external environment increases, and the pressure loss in the back pressure chamber mechanism (3) increases; When the valve flap (1) moves downward to close, the valve stem (4) drives the adjustment component (6) to move downward, the flow area between the back pressure chamber mechanism (3) and the discharge channel of the external environment decreases, and the pressure loss in the back pressure chamber mechanism (3) decreases.

3. A backpressure adjustment structure for a spring safety valve according to claim 2, characterized in that, The adjustment component (6) further includes a connecting part (8), the connecting part (8) is arranged to fixedly sleeve the conical part (7) on the valve stem (4), and the conical part (7) can slide on the valve stem (4); 4. A backpressure regulating structure for a spring safety valve according to claim 3, characterized in that, The upper end of the conical part (7) is provided with a transition part (9), the transition part (9) is sleeved outside the valve stem (4), and the diameter of the transition part (9) is equal to the diameter of the upper end of the conical part (7); the transition part (9) can slide on the valve stem (4); The connecting part (8) is connected to the upper end of the transition part (9), and the connecting part (8) is used to fixedly install the conical part (7) and the transition part (9) at a preset position on the valve stem (4).

5. A backpressure regulating structure of a spring safety valve according to claim 2, characterized in that The back pressure chamber mechanism (3) includes a fixing plate (10) arranged at the top, the fixing plate (10) is installed on the valve body, a through hole (11) is provided on the fixing plate (10), the valve stem (4) is sleeved in the through hole (11), and the upper end size of the conical part (7) is adapted to the size of the through hole (11).

6. A backpressure adjustment structure for a spring safety valve according to claim 5, characterized in that, A flexible component is arranged on the inner side wall of the through hole (11), and the flexible component is used to isolate the adjustment component (6) from the inner side wall of the through hole (11).

7. A backpressure regulating structure of a spring safety valve according to claim 5, characterized in that, A guiding mechanism (12) is arranged at the lower end of the fixing plate (10), the guiding mechanism (12) includes a guiding hole (13), the guiding hole (13) is communicated with the through hole (11), and the valve stem (4) passes through the guiding hole (13).

8. A backpressure regulating structure of a spring safety valve according to claim 7, characterized in that, A plurality of flow holes (14) are provided at the connection between the guiding mechanism (12) and the fixed plate (10), and the flow holes (14) are arranged to communicate the inner cavity of the back pressure chamber mechanism (3) with the bottom of the through hole (11).

9. The backpressure adjustment structure of a spring safety valve according to claim 7, characterized in that, The size of the valve stem (4) is adapted to the size of the guiding hole (13).

10. A backpressure adjustment structure for a spring safety valve according to claim 2, characterized in that, The inner side wall of the conical part (7) is arranged in contact with the valve stem (4).

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