Large diameter double spring safety valve

Abstract

A large-caliber double-spring safety valve comprises a valve body, wherein the valve body is provided with an inlet channel, an outlet channel, a valve stem, and a valve seat arranged on the inlet channel; the outer sleeve of the valve stem is provided with a valve flap which is sealed with the valve seat and is used to control the communication state of the inlet channel and the outlet channel; the inlet channel is provided with a first installation cavity, wherein the first installation cavity is provided with a diaphragm and a first magnetic component; the valve stem comprises an upper valve stem and a lower valve stem; the upper valve stem is provided with a second installation cavity, wherein the second installation cavity is provided with a second magnetic component; the first magnetic component and the second magnetic component are arranged with magnetic poles repelling each other; after water enters the inlet channel, the diaphragm is driven to move and then the first magnetic component is moved; the second magnetic component which repels the first magnetic component abuts against the upper valve stem through the repulsive magnetic force, so that the movement of the upper valve stem drives the valve flap to open the inlet channel and connect the water outlet channel to discharge water.

Description

Technical Field

[0001] The invention relates to a large-caliber double-spring safety valve, belonging to the field of valves. Background Art

[0002] Safety valves are special valves whose opening and closing parts are in a normally closed state under the action of external forces. When the medium pressure in the equipment or pipeline exceeds the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. Safety valves belong to the automatic valve category and are mainly used in boilers, pressure vessels and pipelines to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] The existing safety valve has the problem that the valve cannot be opened normally by the medium pressure when the flow rate is small, resulting in poor valve opening and closing performance and untimely medium delivery. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a large-caliber double-spring safety valve.

[0005] A large-caliber double-spring safety valve comprises a valve body, wherein the valve body is provided with an inlet channel, an outlet channel, a valve stem, and a valve seat arranged on the inlet channel; the outer sleeve of the valve stem is provided with a valve flap which is sealed with the valve seat and is used to control the communication state of the inlet channel and the outlet channel; the inlet channel is provided with a first installation cavity, wherein the first installation cavity is provided with a diaphragm and a first magnetic component; the valve stem comprises an upper valve stem and a lower valve stem; the upper valve stem is provided with a second installation cavity, wherein the second installation cavity is provided with a second magnetic component; the first magnetic component and the second magnetic component are arranged with magnetic poles repelling each other; after water enters the inlet channel, the diaphragm is driven to move and then the first magnetic component is moved; the second magnetic component which repels the first magnetic component abuts against the upper valve stem through the repulsive magnetic force, so that the movement of the upper valve stem drives the valve flap to open the inlet channel and connect the water outlet channel to discharge water. By utilizing the magnetic pole repulsion characteristics of the first magnetic component and the second magnetic component, the valve stem is controlled through magnetic force, so that the pressure change in the water inlet channel can drive the valve stem to move efficiently and accurately. No additional complex control mechanism is required. The water inlet pressure change directly acts on the diaphragm and drives the valve stem to move through magnetic force. The response time is short, and the valve disc can be quickly opened to drain water, ensuring that the pressure release function can still be achieved quickly and reliably under smaller flow requirements, thereby improving the action sensitivity and sealing reliability of the valve disc.

[0006] Preferably, a first spring is fixed in the first installation cavity, the other end of the first spring is fixedly connected to the first magnetic member, and the other end of the first magnetic member is in contact with the diaphragm. The first spring is added in the first installation cavity, so that when the water inlet pressure decreases or disappears, the first spring can provide a reset force to push the diaphragm and the first magnetic member back to the initial position, ensuring that the system quickly returns to a normal state after the pressure is released, thereby improving the stability and reliability of the valve. The elastic force of the first spring can be optimized by selecting springs of different stiffness or adjusting the installation method, so that the safety valve responds more accurately to pressure changes, which helps to adapt to the use requirements under different working conditions. The first spring is in direct contact with the diaphragm, providing a stable supporting force for the diaphragm, avoiding excessive deformation or fatigue caused by relying solely on the water inlet pressure to apply a force to the diaphragm, improving the durability of the diaphragm, and extending the service life of the overall device. The first spring provides additional support and stability for the first magnetic member, so that it can respond more sensitively under the drive of the water inlet pressure, thereby accelerating the opening speed of the valve flap.

[0007] Furthermore, the first magnetic part includes a connection part that is arranged in a convex shape, and the cross section of the diaphragm is arranged in a V-shape, and the top of the connection part abuts against the depression of the diaphragm. The first magnetic part is arranged as a connection part with a convex shape, which can fit tightly with the V-shaped depression of the diaphragm, providing a more secure connection form, and avoiding the possibility of loosening or displacement of the connection part due to pressure fluctuations or vibrations during work. The cross section of the diaphragm is designed in a V-shape, so that when pressure acts, the force can be evenly distributed along the V-shaped edge, reducing the stress concentration phenomenon, reducing the risk of damage to the diaphragm due to local overload, thereby extending its service life. The V-shaped depression is precisely docked with the protrusion of the connection part of the first magnetic part, ensuring that the force transmission between the diaphragm and the first magnetic part is more direct and efficient, which helps to improve the response sensitivity and action accuracy of the system to pressure changes. The design of the combination of concave and convex effectively prevents the diaphragm and the first magnetic part from sliding or displacing during operation, further improves the sealing performance of the diaphragm, and ensures reliable isolation between the water inlet channel and other components. The V-shaped diaphragm and raised connection parts can better buffer and disperse the force when subjected to impact, improving the stability and durability of the system under high-pressure fluctuations or impact conditions.

[0008] Preferably, the upper valve stem and the lower valve stem are connected by threads, a connection port is provided at the bottom of the second mounting cavity, and the second magnetic member includes a convex limiting portion, which extends outward through the connection port and abuts against the lower valve stem when the valve is closed. The upper valve stem and the lower valve stem are designed to be connected by threads, so that the valve stem assembly can be easily disassembled, which is convenient for checking, replacing or maintaining the internal components when necessary, reducing the difficulty and cost of maintenance. The convex limiting portion of the second magnetic member abuts against the lower valve stem through the connection port, providing additional support for the lower valve stem when the valve is closed, which helps to stabilize the position of the lower valve stem and avoid the displacement or loosening of the valve stem caused by external vibration or pressure fluctuation. The close contact between the limiting portion and the lower valve stem can effectively prevent the valve stem from unnecessary shaking in the closed state, ensure the close fit between the valve disc and the valve seat, improve the sealing effect when the valve is closed, and prevent leakage. The existence of the limiting portion can ensure that the movement trajectory of the second magnetic member is more controlled, making the movement of the valve stem more stable and accurate, and helping to improve the sensitivity of the valve to pressure changes.

[0009] Furthermore, the bottom of the second installation cavity is inclined around the connection port, and the outer wall of the second magnetic component is inclined to match the second installation cavity. The inclined bottom of the second installation cavity and the outer wall of the second magnetic component can make the direction of the magnetic force and pressure more uniform and direct, effectively reducing the dispersion or waste of force, thereby improving the movement efficiency and response speed of the valve stem. The matching design of the inclined structure provides a self-positioning function. During the assembly process, the second magnetic component can automatically align and stabilize along the inclined guide surface, improving the convenience and accuracy of installation and avoiding assembly errors. The inclined structure plays a certain buffering role during pressure fluctuations or valve stem movement, dispersing concentrated forces, reducing direct impact on the second magnetic component and the installation cavity, and extending the service life of the component.

[0010] Preferably, a fixed sleeve is provided in the valve body, a valve disc is provided in the sliding sleeve inside the fixed sleeve, and a water outlet is provided on the fixed sleeve for connecting the water inlet channel and the water outlet channel. The valve disc is slidably installed in the fixed sleeve, which provides a guide for the valve disc, ensuring that the valve disc slides along a fixed path during the opening and closing process. The water outlet provided on the fixed sleeve provides a fluid communication path for the water inlet channel and the water outlet channel. At the same time, by optimizing the shape and distribution of the water outlet, the fluid resistance can be effectively reduced and the drainage efficiency can be improved.

[0011] Preferably, the valve flap includes an outer cover body sleeved outside the valve stem and an inner cover body arranged at the bottom of the outer cover body, the inner cover body is provided with a first sealing groove arranged in a concave setting, the valve seat is provided with a second sealing groove arranged in a concave setting, and the inner cover body and the valve seat are sealed and connected by staggered bite of the first sealing groove and the second sealing groove. The inner cover body and the valve seat are sealed by staggered bite of the first sealing groove and the second sealing groove arranged in a concave setting, so that the contact area is increased, the sealing effect is better, and fluid leakage is effectively prevented. The bite sealing method has good stability and anti-interference ability when subjected to external vibration or impact, ensuring the normal operation of the safety valve under harsh working conditions.

[0012] Furthermore, a valve seat sleeve is provided on the outer wall of the valve seat, and the outer cover body is elastic and is arranged in an umbrella shape, and the end face of the valve seat sleeve abuts against the inner wall of the outer cover body to form a sealed connection. The abutment between the outer cover body and the end face of the valve seat sleeve forms an additional sealing surface, which cooperates with the staggered sealing grooves between the inner cover body and the valve seat to provide double sealing protection, further improving the sealing performance and preventing fluid leakage. The outer cover body is elastic and can be fine-tuned with pressure changes. Through the flexible deformation of the umbrella structure, it always maintains close contact with the end face of the valve seat sleeve, ensuring a stable sealing effect under different working conditions. The elastic umbrella-shaped outer cover body can deform appropriately when subjected to force, thereby reducing the resistance during the opening and closing of the valve disc, making the movement more flexible and the response faster, thereby improving the action performance of the safety valve.

[0013] Preferably, the lower valve stem includes a mounting portion that is arranged in a raised manner, a second spring is provided on the outer sleeve of the mounting portion, a sealing portion is connected to the other end of the second spring, a sealing hole is provided on the valve flap, the bottom of the sealing portion is arranged in a circular arc and is sealed and connected to the sealing hole, a connecting groove is provided on the sealing portion, the end of the second spring is fixed to the bottom of the connecting groove, and a gap for the medium to flow out is provided between the lower valve stem and the valve flap. The bottom of the sealing portion is designed to be in an arc shape, which is sealed and connected to the sealing hole on the valve flap, ensuring that the contact surface is more closely fitted, effectively avoiding leakage problems caused by uneven surfaces or pressure fluctuations, and further improving the sealing performance of the valve. When the valve flap fails and cannot be opened, the sealing portion in the valve stem can be opened through the sealing portion and the sealing hole, connecting the water inlet channel and the gap, ensuring that the medium can flow out quickly, effectively discharging the medium and maintaining the sealing performance, and ensuring the safe operation of the system.

[0014] Preferably, a first connecting plate and a second connecting plate are sleeved at both ends of the upper valve stem, and a third spring sleeved outside the upper valve stem is provided between the first connecting plate and the second connecting plate. The provision of the first connecting plate and the second connecting plate effectively fixes the upper valve stem, and the third spring provides additional supporting force, so that the valve stem is more stable during the opening and closing process, and reduces failures caused by valve stem deviation or bending. The third spring provides elastic force between the first connecting plate and the second connecting plate, which can quickly recover when subjected to force, thereby enhancing the sensitivity and reaction speed of the valve, and ensuring that the valve can quickly respond to pressure changes and open or close in time. By adjusting the elastic force of the third spring, the response characteristics of the valve stem can be adjusted during the operation of the valve, so that the valve can better adapt to the needs of different fluid media and working conditions, and improve the flexibility and adaptability of the valve.

[0015] The beneficial effects of the present invention are as follows: utilizing the magnetic pole repulsion characteristics of the first magnetic component and the second magnetic component, the valve stem is controlled through magnetic force, so that the pressure change in the water inlet channel can efficiently and accurately drive the valve stem to move, without the need for an additional complex control mechanism. The water inlet pressure change directly acts on the diaphragm and drives the valve stem to move through magnetic force. The response time is short, and the valve flap can be quickly opened to drain water, ensuring that the pressure release function can still be achieved quickly and reliably under a smaller flow demand, thereby improving the valve flap's action sensitivity and sealing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0017] Figure 1 It is the main structure diagram of the present invention;

[0018] Figure 2 It is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is an enlarged view of the details of the second mounting cavity;

[0020] Figure 4 for Figure 2 A magnified detail of the center point A;

[0021] In the figure, 1. valve body; 11. fixing sleeve; 12. water outlet; 2. water inlet channel; 21. first installation cavity; 22. diaphragm; 23. first magnetic member; 24. connecting part; 25. first spring; 3. water outlet channel; 31. upper valve stem; 32. second installation cavity; 33. connecting port; 34. second magnetic member; 35. limiting part; 36. first connecting plate; 37. second connecting plate; 38. third spring; 4. lower valve stem; 41. installation part; 42. second spring; 43. sealing part; 44. connecting groove; 5. valve disc; 51. outer cover; 52. inner cover; 53. first sealing groove; 54. sealing hole; 6. valve seat; 61. second sealing groove; 62. valve seat sleeve. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0024] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0025] like Figure 1-4As shown, an embodiment of a large-caliber double-spring safety valve of the present invention comprises a valve body 1, wherein the valve body 1 is provided with a water inlet channel 2, a water outlet channel 3, a valve stem, and a valve seat 6 arranged on the water inlet channel 2, wherein the valve stem is externally sleeved with a valve flap 5 which is sealed and connected with the valve seat 6 and is used to control the communication state of the water inlet channel 2 and the water outlet channel 3, wherein a first mounting cavity 21 is provided on the water inlet channel 2, wherein a diaphragm 22 and a first magnetic member 23 are arranged in the first mounting cavity 21, wherein the valve stem comprises an upper valve stem 31 and a lower valve stem 4, wherein a second mounting cavity 32 is provided in the upper valve stem 31, wherein a second magnetic member 34 is arranged in the second mounting cavity 32, wherein the first magnetic member 23 and the second magnetic member 34 are arranged with magnetic poles repelling each other, wherein after water enters the water inlet channel 2, the diaphragm 22 is driven to move and then the first magnetic member 23 is moved, and the second magnetic member 34 which repels the first magnetic member 23 abuts against the upper valve stem 31 through the repulsive magnetic force, so that the upper valve stem 31 moves to drive the valve flap 5 to open the water inlet channel 2 and communicate with the water outlet channel 3 to discharge water. By utilizing the magnetic pole repulsion characteristics of the first magnetic component 23 and the second magnetic component 34, the valve stem is controlled through magnetic force, so that the pressure change in the water inlet channel 2 can efficiently and accurately drive the valve stem to move. No additional complex control mechanism is required. The water inlet pressure change directly acts on the diaphragm 22 and drives the valve stem to move through magnetic force. The response time is short, and the valve flap 5 can be quickly opened to drain water, ensuring that the pressure release function can still be achieved quickly and reliably under a smaller flow demand, thereby improving the action sensitivity and sealing reliability of the valve flap 5.

[0026] A first spring 25 is fixed in the first installation cavity 21, and the other end of the first spring 25 is fixedly connected to the first magnetic member 23, and the other end of the first magnetic member 23 is in contact with the diaphragm 22. The first spring 25 is added in the first installation cavity 21, so that when the water inlet pressure decreases or disappears, the first spring 25 can provide a reset force to push the diaphragm 22 and the first magnetic member 23 back to the initial position, ensuring that the system quickly returns to a normal state after the pressure is released, thereby improving the stability and reliability of the valve. The elastic force of the first spring 25 can be optimized by selecting springs of different stiffness or adjusting the installation method, so that the safety valve responds more accurately to pressure changes, which helps to adapt to the use requirements under different working conditions. The first spring 25 is in direct contact with the diaphragm 22, providing a stable support force for the diaphragm 22, avoiding excessive deformation or fatigue caused by relying solely on the water inlet pressure to apply a force to the diaphragm 22, improving the durability of the diaphragm 22, and extending the service life of the overall device. The first spring 25 provides additional support and stability for the first magnetic member 23 , so that the first magnetic member 23 can respond more sensitively under the drive of the water inlet pressure, thereby accelerating the opening speed of the valve flap 5 .

[0027] The first magnetic member 23 includes a connection portion 24 that is convex, and the cross-section of the diaphragm 22 is V-shaped, and the top of the connection portion 24 abuts against the depression of the diaphragm 22. The first magnetic member 23 is configured as a connection portion 24 with a protrusion, which can fit tightly with the V-shaped depression of the diaphragm 22, providing a more secure connection form, and avoiding the possibility of the connection portion 24 becoming loose or shifting due to pressure fluctuations or vibrations during operation. The cross-section of the diaphragm 22 is V-shaped, so that when pressure is applied, the force can be evenly distributed along the V-shaped edge, reducing stress concentration and reducing the risk of damage to the diaphragm 22 due to local overload, thereby extending its service life. The V-shaped depression is precisely docked with the protrusion of the connection portion 24 of the first magnetic member 23, ensuring that the force transmission between the diaphragm 22 and the first magnetic member 23 is more direct and efficient, which helps to improve the system's response sensitivity to pressure changes and the accuracy of its action. The concave-convex design effectively prevents the diaphragm 22 and the first magnetic member 23 from sliding or displacing during operation, further improving the sealing performance of the diaphragm 22 and ensuring reliable isolation between the water inlet channel 2 and other components. The V-shaped diaphragm 22 and the convex connecting portion 24 can better buffer and disperse the force when subjected to impact force, thereby improving the stability and durability of the system under high-pressure fluctuations or impact conditions.

[0028] The upper valve stem 31 and the lower valve stem 4 are connected by threads, and a connection port 33 is provided at the bottom of the second mounting cavity 32. The second magnetic member 34 includes a convex limiting portion 35, and the limiting portion 35 extends outward through the connection port 33 to abut against the lower valve stem 4 when the valve is closed. The upper valve stem 31 and the lower valve stem 4 are designed to be connected by threads, so that the valve stem assembly can be easily disassembled, which is convenient for checking, replacing or maintaining the internal components when necessary, reducing the difficulty and cost of maintenance. The convex limiting portion 35 of the second magnetic member 34 abuts against the lower valve stem 4 through the connection port 33, providing additional support for the lower valve stem 4 when the valve is closed, helping to stabilize the position of the lower valve stem 4 and avoiding the displacement or loosening of the valve stem caused by external vibration or pressure fluctuation. The close contact between the limiting portion 35 and the lower valve stem 4 can effectively prevent the valve stem from unnecessary shaking in the closed state, ensure the close fit between the valve disc 5 and the valve seat 6, improve the sealing effect when the valve is closed, and prevent leakage. The presence of the limiting portion 35 can ensure that the movement trajectory of the second magnetic member 34 is more controlled, making the movement of the valve stem more stable and precise, and helping to improve the valve's sensitivity to pressure changes.

[0029] The bottom of the second mounting cavity 32 is inclined around the connecting port 33, and the outer wall of the second magnetic component 34 is inclined to match the second mounting cavity 32. The inclined bottom of the second mounting cavity 32 and the outer wall of the second magnetic component 34 can make the direction of the magnetic force and pressure more uniform and direct, effectively reducing the dispersion or waste of force, thereby improving the movement efficiency and response speed of the valve stem. The matching design of the inclined structure provides a self-positioning function. During the assembly process, the second magnetic component 34 can automatically align and stabilize along the inclined guide surface, improving the convenience and accuracy of installation and avoiding assembly errors. The inclined structure plays a certain buffering role during pressure fluctuations or valve stem movement, dispersing concentrated forces, reducing direct impact on the second magnetic component 34 and the mounting cavity, and extending the service life of the component.

[0030] The valve body 1 is provided with a fixed sleeve 11, and a valve disc 5 is provided in a sliding sleeve in the fixed sleeve 11. The fixed sleeve 11 is provided with a water outlet hole 12 for connecting the water inlet channel 2 and the water outlet channel 3. The valve disc 5 is slidably installed in the fixed sleeve 11, which provides a guide for the valve disc 5, ensuring that the valve disc 5 slides along a fixed path during the opening and closing process. The water outlet hole 12 provided on the fixed sleeve 11 provides a fluid communication path for the water inlet channel 2 and the water outlet channel 3. At the same time, by optimizing the shape and distribution of the water outlet hole 12, the fluid resistance can be effectively reduced and the drainage efficiency can be improved.

[0031] The valve flap 5 includes an outer cover body 51 sleeved outside the valve stem and an inner cover body 52 arranged at the bottom of the outer cover body 51, the inner cover body 52 is provided with a first sealing groove 53 set in a recessed manner, and the valve seat 6 is provided with a second sealing groove 61 set in a recessed manner. The inner cover body 52 and the valve seat 6 are sealed and connected by staggered bite of the first sealing groove 53 and the second sealing groove 61. The inner cover body 52 and the valve seat 6 are sealed by staggered bite of the first sealing groove 53 and the second sealing groove 61 set in a recessed manner, so that the contact area is increased, the sealing effect is better, and the fluid leakage is effectively prevented. The bite sealing method has good stability and anti-interference ability when subjected to external vibration or impact, ensuring the normal operation of the safety valve under harsh working conditions.

[0032] The outer wall of the valve seat 6 is provided with a valve seat 6 set, and the outer cover body 51 is elastic and umbrella-shaped, and the end face of the valve seat 6 set abuts against the inner wall of the outer cover body 51 to form a sealed connection. The abutment between the outer cover body 51 and the end face of the valve seat 6 set forms an additional sealing surface, which cooperates with the staggered sealing groove between the inner cover body 52 and the valve seat 6 to provide double sealing protection, further improve the sealing performance, and prevent fluid leakage. The outer cover body 51 is elastic and can be fine-tuned with pressure changes. Through the flexible deformation of the umbrella structure, it always maintains close contact with the end face of the valve seat 6 set, ensuring that a stable sealing effect can be maintained under different working conditions. The elastic umbrella-shaped outer cover body 51 can deform appropriately when subjected to force, thereby reducing the resistance of the valve flap 5 during the opening and closing process, making the movement more flexible and the response more rapid, thereby improving the action performance of the safety valve.

[0033] The lower valve stem 4 includes a mounting portion 41 which is provided with a protruding shape. A second spring 42 is provided on the outer sleeve of the mounting portion 41. The other end of the second spring 42 is connected to a sealing portion 43. A sealing hole 54 is provided on the valve flap 5. The bottom of the sealing portion 43 is provided with an arc shape and is sealed and connected to the sealing hole 54. A connecting groove 44 is provided on the sealing portion 43. The end of the second spring 42 is fixed to the bottom of the connecting groove 44. A gap for medium outflow is provided between the lower valve stem 4 and the valve flap 5. The bottom of the sealing portion 43 is designed to be in an arc shape and is sealed and connected to the sealing hole 54 on the valve flap 5, ensuring that the contact surface is more closely fitted, effectively avoiding leakage problems caused by uneven surfaces or pressure fluctuations, and further improving the sealing performance of the valve. When the valve flap 5 fails and cannot be opened, the sealing portion 43 in the valve stem can be opened through the sealing portion 43 and the sealing hole 54, connecting the water inlet channel 2 and the gap, ensuring that the medium can flow out quickly, effectively discharging the medium and maintaining the sealing performance, and ensuring the safe operation of the system.

[0034] The first connecting plate 36 and the second connecting plate 37 are sleeved at both ends of the upper valve stem 31, and a third spring 38 sleeved outside the upper valve stem 31 is provided between the first connecting plate 36 and the second connecting plate 37. The setting of the first connecting plate 36 and the second connecting plate 37 effectively fixes the upper valve stem 31, and the third spring 38 provides additional support force, so that the valve stem is more stable during the opening and closing process, and reduces the failure caused by the displacement or bending of the valve stem. The third spring 38 provides elastic force between the first connecting plate 36 and the second connecting plate 37, which can recover quickly when subjected to force, enhances the sensitivity and reaction speed of the valve, and ensures that the valve can respond quickly to pressure changes and open or close in time. By adjusting the elastic force of the third spring 38, the response characteristics of the valve stem can be adjusted during the operation of the valve, so that the valve can better adapt to the needs of different fluid media and working conditions, and improve the flexibility and adaptability of the valve.

[0035] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

[0036] Although the invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the specific embodiments disclosed. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. Large diameter double spring safety valve, characterized by: The invention comprises a valve body, wherein the valve body is provided with an inlet channel, an outlet channel, a valve stem, and a valve seat provided on the inlet channel; the valve stem is externally sleeved with a valve flap which is sealed and connected with the valve seat and is used to control the communication state between the inlet channel and the outlet channel; the inlet channel is provided with a first installation cavity, the first installation cavity is provided with a diaphragm and a first magnetic component; the valve stem comprises an upper valve stem and a lower valve stem; the upper valve stem is provided with a second installation cavity, the second installation cavity is provided with a second magnetic component; the first magnetic component and the second magnetic component are arranged with magnetic poles repelling each other; after water enters the inlet channel, the diaphragm is driven to move and then the first magnetic component is moved; the second magnetic component which repels the first magnetic component abuts against the upper valve stem through the repulsive magnetic force, so that the upper valve stem moves and drives the valve flap to open the inlet channel and connect the water outlet channel to discharge water; A first spring is fixed in the first installation cavity, the other end of the first spring is fixedly connected to the first magnetic member, and the other end of the first magnetic member abuts against the diaphragm; The first magnetic member includes a connection portion that is convex, the cross section of the diaphragm is V-shaped, and the top of the connection portion abuts against the concave portion of the diaphragm; The upper valve stem and the lower valve stem are connected by threads, a connecting port is provided at the bottom of the second installation cavity, and the second magnetic member includes a protruding limiting portion, which extends outward through the connecting port and abuts against the lower valve stem when the valve is closed; A fixed sleeve is provided in the valve body, a valve flap is provided in the sliding sleeve inside the fixed sleeve, and a water outlet hole is provided on the fixed sleeve for connecting the water inlet channel and the water outlet channel; The valve flap comprises an outer cover body sleeved outside the valve stem and an inner cover body arranged at the bottom of the outer cover body, the inner cover body is provided with a first sealing groove arranged in a concave manner, the valve seat is provided with a second sealing groove arranged in a concave manner, and the inner cover body and the valve seat are connected in a sealing manner through the staggered bite of the first sealing groove and the second sealing groove; The outer wall of the valve seat is provided with a valve seat sleeve, the outer cover body is elastic and is arranged in an umbrella shape, and the end surface of the valve seat sleeve abuts against the inner wall of the outer cover body to form a sealed connection.

2. The large-caliber double-spring safety valve according to claim 1, characterized in that: The bottom of the second installation cavity is inclined around the connecting port, and the outer wall of the second magnetic member is inclined to match the second installation cavity.

3. The large-caliber double-spring safety valve according to claim 1, characterized in that: The lower valve stem includes a mounting portion that is arranged in a raised manner, a second spring is provided on the outer sleeve of the mounting portion, a sealing portion is connected to the other end of the second spring, a sealing hole is provided on the valve disc, the bottom of the sealing portion is arranged in a circular arc and is sealed and connected to the sealing hole, a connecting groove is provided on the sealing portion, an end of the second spring is fixed to the bottom of the connecting groove, and a gap for medium outflow is provided between the lower valve stem and the valve disc.

4. The large-caliber double-spring safety valve according to claim 1, characterized in that: A first connecting plate and a second connecting plate are sleeved at both ends of the upper valve stem, and a third spring sleeved outside the upper valve stem is provided between the first connecting plate and the second connecting plate.

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