Spring-loaded safety valve

Abstract

The present invention discloses a spring-type safety valve, comprising a valve body, a valve cover, a valve stem, an elastic component, a guide sleeve, a recoil disc, a valve disc and a valve seat, wherein the valve body is provided with an inlet flow channel and an outlet flow channel, and also comprises an emergency auxiliary valve mechanism, wherein the emergency auxiliary valve mechanism comprises a switching component, a mounting ring, a blocking ring, a plurality of opening and closing components and a plurality of return components, a plurality of inner holes are provided through the periphery of the valve seat, the mounting ring is installed on the periphery of the valve seat, a plurality of pressure relief channels are provided on the mounting ring, the opening and closing components are installed on the mounting ring, the blocking ring is sleeved on the periphery of the valve seat, the blocking ring is connected to the upper end of the mounting ring through a plurality of return components and blocks the outlet of the pressure relief channel, and the switching component is used to drive the blocking ring to move away from the mounting ring, so as to cause the outlet of the pressure relief channel to be connected with the inlet flow channel. When the valve stem is blocked and cannot be opened normally, the emergency auxiliary valve is opened to allow the high-pressure medium to pass through for pressure relief, which not only does not affect the working effect, but also improves the production safety.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a spring type safety valve. Background Art

[0002] A safety valve is a special valve whose opening and closing parts are in a normally closed state under the action of external force. When the medium pressure in the equipment or pipeline rises above the specified value, it prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium outside the system.

[0003] A spring-loaded safety valve relies on the elastic pressure of the spring to lock the valve diaphragm or plunger and other seals. Once the pressure in the pressure vessel is abnormal, the high pressure generated will overcome the spring pressure of the safety valve, so the locking device is pushed open, forming a pressure relief channel to release the high pressure. According to the opening height of the valve disc, it is divided into full-lift type and micro-lift type. The full-lift type has a large discharge volume and good resilience, and is suitable for liquid and gas media. The micro-lift type is only suitable for liquid media.

[0004] Most of the existing spring-loaded safety valve structures are similar to the spring-loaded safety valve for low-temperature media disclosed in the invention patent with patent application number CN202311464847.0. In this safety valve structure, when the valve is opened, the fluid medium can directly enter the valve cover and contact the valve stem. Since there are usually certain solid impurities in the fluid medium, after long-term use, the solid impurities will adhere to the valve stem, making the valve stem operation have the risk of jamming. When the valve stem is jammed, the pipeline needs to stop running and the valve needs to be removed for cleaning and maintenance. This process delays the production progress and greatly reduces the production efficiency. In addition, the safety valve cannot be opened normally, posing certain safety hazards. Summary of the invention

[0005] The purpose of the present invention is to provide a spring-type safety valve. When the valve stem is stuck and cannot be opened normally, the emergency auxiliary valve is opened to allow high-pressure medium to pass through for pressure relief, which not only does not affect the working effect but also improves production safety.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spring-type safety valve, comprising a valve body, a valve cover, a valve stem, an elastic component, a guide sleeve, a recoil disc, a valve flap and a valve seat, wherein the valve body is provided with an inlet flow channel and an outlet flow channel which are interconnected, the valve cover is mounted on the valve body, the outer edge of the guide sleeve is clamped between the valve body and the valve cover, the recoil disc is axially slidably arranged in the guide sleeve, the valve stem passes through the valve cover and the valve body and abuts against the upper end of the recoil disc, the valve flap is mounted on the lower end of the recoil disc, the valve seat is arranged in the inlet flow channel, the elastic component applies a downward force to the valve stem, so that the recoil disc presses the valve flap against the upper end of the valve seat; and further comprising An emergency auxiliary valve mechanism, the emergency auxiliary valve mechanism includes a switching assembly, a mounting ring, a blocking ring, multiple groups of opening and closing assemblies and multiple groups of return assemblies, the outer periphery of the valve seat is provided with multiple inner holes, the mounting ring is installed on the outer periphery of the valve seat, and the mounting ring is provided with multiple pressure relief channels for connecting the corresponding inner holes with the inlet flow channel, the opening and closing assembly is installed on the mounting ring for opening and closing the pressure relief channel, the blocking ring is sleeved on the outer periphery of the valve seat, the blocking ring is connected to the upper end of the mounting ring through multiple groups of return assemblies and blocks the outlet of the pressure relief channel, the switching assembly is used to drive the blocking ring to move away from the mounting ring, so that the outlet of the pressure relief channel is connected to the inlet flow channel.

[0007] By adopting the above technical solution, when the valve stem is stuck and cannot be opened normally, the upstream pressure gauge shows that the upstream pipeline pressure is about to exceed the set pressure, and the switching component of the emergency auxiliary valve mechanism is manually operated to separate the blocking ring from the installation ring, so that the outlet of the pressure relief channel is connected to the inlet flow channel. At this time, the opening and closing component is opened under the action of the medium pressure, and the upstream medium enters the inlet flow channel from the pressure relief channel, thereby achieving the effect of emergency pressure relief. After the pressure drops, the opening and closing component is automatically closed, and then the switching component of the emergency auxiliary valve mechanism is manually reversed. The blocking ring is re-impeded against the installation ring under the action of the return component, and the valve is maintained after the process is completed. Not only will it not affect the working effect, but it will also improve production safety.

[0008] The present invention is further configured as follows: the opening and closing assembly includes an opening and closing piston, an opening and closing spring and a pressure-adjusting nut; the mounting ring is provided with a threaded groove, a middle cavity and a water inlet hole in sequence from the outside to the inside, and the inner diameters of the threaded groove, the middle cavity and the water inlet hole decrease in sequence; the upper end of the mounting ring is provided with a water outlet hole connected to the middle cavity; the water inlet hole, the middle cavity and the water outlet hole are connected to form the pressure relief channel; the opening and closing piston is slidably arranged in the middle cavity, and the outer periphery of the opening and closing piston is tightly fitted with the inner periphery of the middle cavity; the outer periphery of the opening and closing piston is provided with a plurality of guide grooves extending axially; the pressure-adjusting nut is threadedly connected in the threaded groove, and the outer end of the pressure-adjusting nut is provided with an inner hexagonal groove; the opening and closing spring is clamped between the pressure-adjusting nut and the opening and closing piston for pressing the opening and closing piston against the inner end of the middle cavity to block the water inlet hole; and the pressure-adjusting nut and the opening and closing piston are respectively provided with a first positioning groove and a second positioning groove for embedding the two ends of the opening and closing spring.

[0009] By adopting the above technical solution, the initial preload force of the opening and closing piston can be adjusted by rotating the pressure-adjusting nut to adjust the compression amount of the opening and closing spring, and then the opening pressure of the opening and closing assembly can be adjusted to match the set maximum pressure. When the upstream medium pressure reaches the set pressure, the medium pushes the opening and closing piston and passes through the guide groove on the side of the opening and closing piston into the water outlet, and then flows from the water outlet to the inlet channel to achieve pressure relief. The structure is simple and reliable, and disassembly and assembly and maintenance are very convenient.

[0010] The present invention is further configured such that the mounting ring is threadedly connected to the outer periphery of the valve seat, an annular groove is provided on the outer periphery of the valve seat, and the inner hole is connected to the water inlet hole through the annular groove.

[0011] By adopting the above technical solution, the connection structure of the mounting ring is simple and reliable, and disassembly and assembly are very convenient. An annular groove is arranged on the outer periphery of the valve seat, so that no matter what angle the mounting ring is located at, the inner hole can be connected with the water inlet hole through the annular groove, which greatly facilitates the installation operation of the mounting ring.

[0012] The present invention is further configured as follows: the return assembly includes a return rod, a return spring, an upper gasket and a lower gasket, the blocking ring and the mounting ring are respectively provided with an upper hole and a lower hole, the upper hole and the corresponding lower hole are coaxially arranged, and the lower end of the mounting ring is also provided with an active cavity coaxial with the lower hole, the return rod passes through the upper hole, the lower hole and the active cavity in sequence, the outer periphery of the return rod is clamped with a retaining spring for limiting the upper gasket to the upper end of the blocking ring, the outer periphery of the return rod is threadedly connected with a limiting nut at a position corresponding to the active cavity, the lower gasket is arranged at the upper end of the limiting nut, the return spring is arranged in the active cavity, and the two ends of the return spring are respectively tightly pressed against the upper end of the active cavity and the upper end of the lower gasket.

[0013] By adopting the above technical solution, when the blocking ring is separated from the mounting ring, the return spring is compressed to store energy. When the switching assembly is operated in the reverse direction, the return spring releases energy, pushing the return rod to move downward, pressing the blocking ring against the mounting ring, thereby realizing automatic return of the blocking ring and achieving a stable and reliable structure.

[0014] The present invention is further configured such that a first sealing ring for sealingly cooperating with the outer periphery of the valve seat is respectively arranged at positions above and below the annular groove on the inner periphery of the mounting ring, a second sealing ring for sealingly cooperating with the outer periphery of the valve seat is respectively arranged at the inner periphery of the blocking ring, a third sealing ring for sealingly cooperating with the blocking ring is respectively arranged at positions on the upper end of the mounting ring corresponding to the outer periphery of each water outlet hole, and a fourth sealing ring for sealingly cooperating with the blocking ring is respectively arranged at positions on the upper end of the mounting ring corresponding to the outer periphery of each lower hole.

[0015] By adopting the above technical solution, effective sealing of each matching part is achieved to avoid medium leakage.

[0016] The present invention is further configured as follows: the switching assembly includes an operating ring, a plurality of ejector pins and a plurality of return springs; a plurality of guide grooves are provided on the outer wall of the valve body; a guide hole connected to the inlet flow channel is provided at the inner end of the guide groove; the ejector pin passes through the guide hole and extends into the inlet flow channel; the ejector pin is provided with an annular limiting portion extending toward the outer periphery at a position corresponding to the position in the guide groove; an O-ring for sealing with the inner periphery of the guide groove is provided on the outer periphery of the annular limiting portion; the return spring is sleeved on the outer periphery of the ejector pin, and one end of the return spring is against the inner end of the guide groove, and the other end of the return spring is against the annular limiting portion. The inner ends of the limiting parts are abutted against each other, the operating ring is rotatably arranged on the outer periphery of the valve body, and the operating ring is provided with a track groove matching the outer end of the ejector pin, the track groove comprises a shallow groove portion, an inclined portion and a deep groove portion in sequence, the inner end of the ejector pin is conical in shape, and a conical recess for inserting the ejector pin is provided at the outer edge of the lower end of the blocking ring, when the outer end of the ejector pin is located in the shallow groove portion, the blocking ring and the mounting ring are tightly abutted against each other, and when the outer end of the ejector pin is located in the deep groove portion, the inner end of the ejector pin is inserted into the conical recess and pushes the blocking ring open, so that the outlet of the pressure relief channel is connected with the inlet flow channel.

[0017] By adopting the above technical solution, by rotating the operating ring, the ejector pin slides along the inner extension track groove under the action of the return spring, forming an inward or outward movement, that is, when the outer end of the ejector pin is located in the shallow groove part, the blocking ring and the mounting ring are tightly abutted against each other, and when the outer end of the ejector pin is located in the deep groove part, the inner end of the ejector pin is inserted into the conical recess and pushes the blocking ring open, so that the outlet of the pressure relief channel is connected with the inlet flow channel, thereby realizing the activation or deactivation of the emergency auxiliary valve mechanism, making the emergency performance more stable and reliable.

[0018] The present invention is further configured such that an annular limiting groove is provided on the outer periphery of the valve body, and the operating ring is rotatably disposed in the annular limiting groove.

[0019] By adopting the above technical solution, the operating ring is limited by the annular limiting groove so that it can only rotate in the circumferential direction but cannot move axially, which makes the operation more convenient.

[0020] The present invention is further configured as follows: the operating ring includes a left half ring and a right half ring, the two end faces of the left half ring are respectively provided with a positioning protrusion, the two end faces of the right half ring are respectively provided with a positioning recess that matches the corresponding positioning protrusion, the side portions of the left half ring close to both ends are respectively provided with a mounting protrusion, a buckle is hinged on the mounting protrusion, the side portions of the right half ring close to both ends are respectively provided with a clamping block, the buckle is buckled on the clamping block, and the clamping block is provided with a clamping groove for the buckle to be embedded in.

[0021] By adopting the above technical solution, the assembly of the operating ring is greatly facilitated, and the assembly structure is firm and reliable, which is beneficial to the early production and later disassembly and maintenance.

[0022] The present invention is further configured such that the operating ring further includes two operating plates, the mounting protrusion is provided with a screw hole, the operating plate is provided with a screw rod, and the screw rod is threadedly connected to the screw hole of the corresponding mounting protrusion.

[0023] By adopting the above technical solution, an operating plate is arranged on the outer periphery of the operating ring, so that the user can apply force to rotate the operating ring, and the operation is easier.

[0024] The present invention is further configured such that the elastic component includes an adjusting screw sleeve, an upper spring seat, a lower spring seat and an adjusting spring which are sequentially sleeved on the outer periphery of the valve stem from top to bottom, the adjusting screw sleeve is threadedly connected to the upper end of the valve cover, a limiting step is provided on the outer periphery of the valve stem, and the two ends of the adjusting spring act on the upper spring seat and the lower spring seat respectively, causing the upper spring seat to be pressed against the lower end of the adjusting screw sleeve, while the lower spring seat is pressed against the limiting step.

[0025] By adopting the above technical solution, the axial position of the adjusting screw sleeve is changed by rotating the adjusting screw sleeve, thereby adjusting the compression force of the spring, and then adjusting the opening pressure of the safety valve to make it consistent with the preset maximum pressure of the pipeline, and the adjustment operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the emergency auxiliary valve mechanism of the present invention when it is not activated; Figure 3 This is a schematic diagram of the structure of the emergency auxiliary valve mechanism of the present invention when it is activated; Figure 4 for Figure 3 The enlarged structural diagram of the middle A part; Figure 5 It is a structural schematic diagram of the return assembly of the present invention; Figure 6 It is a structural schematic diagram of the operating ring of the present invention; Figure 7 It is a cross-sectional view of the operating ring of the present invention.

[0027] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. elastic component; 5. guide sleeve; 6. recoil disc; 7. valve disc; 8. valve seat; 9. inlet flow channel; 10. outlet flow channel; 11. emergency auxiliary valve mechanism; 12. switching component; 13. mounting ring; 14. blocking ring; 15. opening and closing component; 16. return component; 17. inner hole; 18. pressure relief channel; 19. opening and closing piston; 20. opening and closing spring; 21. pressure regulating nut; 22. threaded groove; 23. middle cavity; 24. water inlet hole; 25. water outlet hole; 26. guide groove; 27. inner hexagonal groove; 28. first positioning groove; 29. ​​second positioning groove; 30. annular groove; 31. return rod; 32. return spring; 33. upper gasket; 34. lower gasket; 35. upper hole; 36. lower hole; 37. movable Cavity; 38, retaining ring; 39, limiting nut; 40, first sealing ring; 41, second sealing ring; 42, third sealing ring; 43, fourth sealing ring; 44, operating ring; 45, ejector pin; 46, return spring; 47, guide groove; 48, annular limiting portion; 49, O-ring; 50, track groove; 51, shallow groove portion; 52, inclined portion; 53, deep groove portion; 54, conical recess; 55, annular limiting groove; 56, left half ring; 57, right half ring; 58, positioning convex portion; 59, positioning concave portion; 60, buckle; 61, block; 62, slot; 63, operating plate; 64, screw hole; 65, screw; 66, adjusting screw sleeve; 67, upper spring seat; 68, lower spring seat; 69, adjusting spring; 70, limiting step; 71, guide hole; 72, mounting convex portion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: As shown in the attached Figures 1 to 7A spring-type safety valve shown in the figure comprises a valve body 1, a valve cover 2, a valve stem 3, an elastic component 4, a guide sleeve 5, a recoil disc 6, a valve flap 7 and a valve seat 8. The valve body 1 is provided with an inlet flow channel 9 and an outlet flow channel 10 which are interconnected. The valve cover 2 is mounted on the valve body 1. The outer edge of the guide sleeve 5 is clamped between the valve body 1 and the valve cover 2. The recoil disc 6 is axially slidably arranged in the guide sleeve 5. The valve stem 3 penetrates the valve cover 2 and the valve body 1 and abuts against the upper end of the recoil disc 6. The valve flap 7 is mounted on the lower end of the recoil disc 6. The valve seat 8 is arranged in the inlet flow channel 9 and can be connected by threaded fitting. The elastic component 4 applies a downward force to the valve stem 3, prompting the recoil disc 6 to press the valve flap 7 against the upper end of the valve seat 8. The safety valve also includes an emergency auxiliary valve mechanism 11. The emergency sub-valve mechanism 11 includes a switching component 12, a mounting ring 13, a blocking ring 14, multiple groups of opening and closing components 15 and multiple groups of return components 16. The outer periphery of the valve seat 8 is provided with multiple inner holes 17. The mounting ring 13 is installed on the outer periphery of the valve seat 8, and the mounting ring 13 is provided with multiple pressure relief channels 18 for connecting the corresponding inner holes 17 with the inlet flow channel 9. The opening and closing component 15 is installed on the mounting ring 13 for opening and closing the pressure relief channel 18. The blocking ring 14 is sleeved on the outer periphery of the valve seat 8. The blocking ring 14 is connected to the upper end of the mounting ring 13 through multiple groups of return components 16 and blocks the outlet of the pressure relief channel 18. The switching component 12 is used to drive the blocking ring 14 to move away from the mounting ring 13, so that the outlet of the pressure relief channel 18 is connected to the inlet flow channel 9. When the valve stem 3 is stuck and cannot be opened normally, the upstream pressure gauge shows that the upstream pipeline pressure is about to exceed the set pressure. The switching component 12 of the emergency auxiliary valve mechanism 11 is manually operated to separate the blocking ring 14 from the mounting ring 13, so that the outlet of the pressure relief channel 18 is connected to the inlet flow channel 9. At this time, the opening and closing component 15 is opened under the action of the medium pressure, and the upstream medium enters the inlet flow channel 9 from the pressure relief channel 18, thereby achieving the effect of emergency pressure relief. After the pressure drops, the opening and closing component 15 is automatically closed, and then the switching component 12 of the emergency auxiliary valve mechanism 11 is manually reversed. The blocking ring 14 is re-adjusted against the mounting ring 13 under the action of the return component 16. The valve is maintained after the process is completed, which not only does not affect the working effect but also improves production safety.

[0030] As attached Figure 4As shown, the opening and closing assembly 15 includes an opening and closing piston 19, an opening and closing spring 20 and a pressure regulating nut 21, the mounting ring 13 is provided with a thread groove 22, a middle cavity 23 and a water inlet hole 24 from the outside to the inside, and the inner diameters of the thread groove 22, the middle cavity 23 and the water inlet hole 24 are reduced in sequence, and the upper end of the mounting ring 13 is provided with a water outlet hole 25 connected to the middle cavity 23, and the water inlet hole 24, the middle cavity 23 and the water outlet hole 25 are connected to form the pressure relief channel 18, the opening and closing piston 19 is slidably arranged in the middle cavity 23, and the opening and closing piston 1 9 is tightly fitted with the inner periphery of the middle cavity 23, the outer periphery of the opening and closing piston 19 is provided with a plurality of guide grooves 26 extending along the axial direction, the pressure regulating nut 21 is threadedly connected in the thread groove 22, and the outer end of the pressure regulating nut 21 is provided with a hexagonal groove 27, the opening and closing spring 20 is clamped between the pressure regulating nut 21 and the opening and closing piston 19, and is used to press the opening and closing piston 19 against the inner end of the middle cavity 23 to block the water inlet hole 24, and the pressure regulating nut 21 and the opening and closing piston 19 are respectively provided with a first positioning groove 28 and a second positioning groove 29 for embedding the two ends of the opening and closing spring 20. The initial preload force on the opening and closing piston 19 can be adjusted by rotating the pressure-adjusting nut 21 to adjust the compression amount of the opening and closing spring 20, thereby adjusting the opening pressure of the opening and closing assembly 15 to match the set maximum pressure. When the upstream medium pressure reaches the set pressure, the medium pushes the opening and closing piston 19 and passes through the guide groove 26 on the side of the opening and closing piston 19 into the water outlet 25, and then flows out of the water outlet 25 to the inlet channel to achieve pressure relief. The structure is simple and reliable, and it is very convenient to disassemble and maintain.

[0031] As attached Figure 4 As shown, the mounting ring 13 is threadedly connected to the outer periphery of the valve seat 8, and an annular groove 30 is provided on the outer periphery of the valve seat 8. The inner hole 17 is connected to the water inlet hole 24 through the annular groove 30, that is, the inner hole 17 is connected to the inner circumference of the annular groove 30, and the water inlet hole 24 is connected to the outer circumference of the annular groove 30. The connection structure of the mounting ring 13 is simple and reliable, and it is very convenient to disassemble and assemble. The annular groove 30 is provided on the outer periphery of the valve seat 8, so that no matter what angle the mounting ring 13 is located, the inner hole 17 can be connected to the water inlet hole 24 through the annular groove 30, which greatly facilitates the installation operation of the mounting ring 13.

[0032] As attached Figure 5As shown, the return assembly 16 includes a return rod 31, a return spring 32, an upper gasket 33 and a lower gasket 34. The blocking ring 14 and the mounting ring 13 are respectively provided with an upper hole 35 and a lower hole 36. The upper hole 35 and the corresponding lower hole 36 are coaxially arranged. The lower end of the mounting ring 13 is also provided with an active cavity 37 coaxial with the lower hole 36. The return rod 31 passes through the upper hole 35, the lower hole 36 and the active cavity 37 in sequence. The outer periphery of the return rod 31 is clamped with a retaining spring 38 for limiting the upper gasket 33 to the upper end of the blocking ring 14. The outer periphery of the return rod 31 is threadedly connected with a limiting nut 39 corresponding to the position in the active cavity 37. The lower gasket 34 is arranged at the upper end of the limiting nut 39. The return spring 32 is arranged in the active cavity 37, and the two ends of the return spring 32 are respectively pressed against the upper end of the active cavity 37 and the upper end of the lower gasket 34. When the blocking ring 14 is separated from the mounting ring 13, the return spring 32 is compressed to store energy. When the switching assembly 12 is reversed, the return spring 32 releases energy, pushing the return rod 31 to move downward, pressing the blocking ring against the mounting ring 13, thereby realizing automatic return of the blocking ring and achieving a stable and reliable structure.

[0033] As attached Figures 2 to 5 As shown, the inner circumference of the mounting ring 13 corresponds to the upper and lower positions of the annular groove 30, respectively, and is provided with a first sealing ring 40 for sealing with the outer circumference of the valve seat 8; the inner circumference of the blocking ring 14 is provided with a second sealing ring 41 for sealing with the outer circumference of the valve seat 8; the upper end of the mounting ring 13 corresponds to the outer circumference of each water outlet 25, respectively, and is provided with a third sealing ring 42 for sealing with the blocking ring 14; and the upper end of the mounting ring 13 corresponds to the outer circumference of each lower hole 36, respectively, and is provided with a fourth sealing ring 43 for sealing with the blocking ring 14. This design realizes effective sealing of each matching part to avoid leakage of the medium.

[0034] As attached Figures 2 to 7As shown, the switching assembly 12 includes an operating ring 44, a plurality of ejector pins 45 and a plurality of return springs 46. A plurality of guide grooves 47 are provided on the outer wall of the valve body 1. A guide hole 71 communicating with the inlet flow channel 9 is provided at the inner end of the guide groove 47. The ejector pin 45 passes through the guide hole 71 and extends into the inlet flow channel 9. The ejector pin 45 is provided with an annular limiting portion 48 extending toward the outer periphery at a position corresponding to the position in the guide groove 47. The outer periphery of the annular limiting portion 48 is provided with a plurality of guide holes 71 communicating with the inlet flow channel 9. The inner periphery of the groove 47 forms an O-ring 49 for sealing, the return spring 46 is sleeved on the outer periphery of the ejector pin 45, and one end of the return spring 46 abuts against the inner end of the guide groove 47, and the other end of the return spring 46 abuts against the inner end of the annular limit portion 48. The operating ring 44 is rotatably arranged on the outer periphery of the valve body 1, and the operating ring 44 is provided with a track groove 50 that matches the outer end of the ejector pin 45. The extension structure of the track groove 50 is in an arc shape, and the track groove 50 includes the following parts in sequence: The shallow groove portion 51, the inclined portion 52 and the deep groove portion 53, the depth of the deep groove portion 53 is greater than that of the shallow groove portion 51, and the inclined portion 52 serves as a transition groove connecting the two. The inner end of the ejector pin 45 is conical, and a conical recess 54 for inserting the ejector pin 45 is provided at the outer edge of the lower end of the blocking ring 14. By rotating the operating ring 44, the ejector pin 45 slides along the inner extension track groove 50 under the action of the return spring 46, forming an inward or outward movement, that is, when the outer end of the ejector pin 45 is located at When the outer end of the ejector pin 45 is located in the shallow groove portion 51, the blocking ring 14 and the mounting ring 13 are tightly pressed against each other. When the outer end of the ejector pin 45 is located in the deep groove portion 53, the inner end of the ejector pin 45 is inserted into the conical recess 54 and pushes the blocking ring 14 open, so that the outlet of the pressure relief channel 18 is connected to the inlet flow channel 9, thereby realizing the activation or deactivation of the emergency sub-valve mechanism 11, making the emergency performance more stable and reliable.

[0035] As attached Figure 2 As shown, the outer periphery of the valve body 1 is provided with an annular limiting groove 55, and the operating ring 44 is rotatably arranged in the annular limiting groove 55. The operating ring 44 is limited by the annular limiting groove 55 so that it can only rotate circumferentially but cannot move axially, which makes the operation more convenient.

[0036] As attached Figure 6 and attached Figure 7As shown, the operating ring 44 includes a left half ring 56 and a right half ring 57. A positioning convex portion 58 is respectively provided on the two end faces of the left half ring 56, and a positioning concave portion 59 is respectively provided on the two end faces of the right half ring 57, which matches the corresponding positioning convex portion 58. A mounting convex portion 72 is respectively provided on the side of the left half ring 56 near both ends, and a buckle 60 is hinged on the mounting convex portion 72. A clamping block 61 is respectively provided on the side of the right half ring 57 near both ends, and the buckle 60 is buckled on the clamping block 61, and the clamping block 61 is provided with a clamping groove 62 for the buckle 60 to be embedded. This design greatly facilitates the assembly of the operating ring 44, and the assembly structure is firm and reliable, which is conducive to early production and later disassembly and maintenance.

[0037] As attached Figure 6 and attached Figure 7 As shown, the operating ring 44 also includes two operating plates 63, the mounting protrusion 72 is provided with a screw hole 64, the operating plate 63 is provided with a screw rod 65, and the screw rod 65 is threadedly connected to the screw hole 64 of the corresponding mounting protrusion 72. The operating plate 63 is arranged on the outer periphery of the operating ring 44, so that the user can apply force to rotate the operating ring 44, and the operation is easier.

[0038] As attached Figure 1 As shown, the elastic component 4 includes an adjusting screw sleeve 66, an upper spring seat 67, a lower spring seat 68 and an adjusting spring 69 which are sequentially sleeved on the outer periphery of the valve stem 3 from top to bottom. The adjusting screw sleeve 66 is threadedly connected to the upper end of the valve cover 2. A limiting step 70 is provided on the outer periphery of the valve stem 3. The two ends of the adjusting spring 69 act on the upper spring seat 67 and the lower spring seat 68 respectively, so that the upper spring seat 67 is pressed against the lower end of the adjusting screw sleeve 66, and the lower spring seat 68 is pressed against the limiting step 70. By rotating the adjusting screw sleeve 66, its axial position is changed, thereby adjusting the compression force of the spring 69, and then realizing the adjustment of the opening pressure of the safety valve, so that it is consistent with the preset maximum pressure of the pipeline, and the adjustment operation is very convenient.

Claims

1. A spring-loaded safety valve, comprising a valve body (1), a valve cover (2), a valve stem (3), an elastic component (4), a guide sleeve (5), a recoil disc (6), a valve flap (7) and a valve seat (8), wherein the valve body (1) is provided with an inlet flow channel (9) and an outlet flow channel (10) which are interconnected, the valve cover (2) is mounted on the valve body (1), the outer edge of the guide sleeve (5) is clamped between the valve body (1) and the valve cover (2), the recoil disc (6) is axially slidably arranged in the guide sleeve (5), the valve stem (3) penetrates the valve cover (2) and the valve body (1) and abuts against the upper end of the recoil disc (6), the valve flap (7) is mounted on the lower end of the recoil disc (6), the valve seat (8) is arranged in the inlet flow channel (9), the elastic component (4) applies a downward force to the valve stem (3), so that the recoil disc (6) presses the valve flap (7) against the upper end of the valve seat (8); the characteristics are as follows: The invention also comprises an emergency auxiliary valve mechanism (11), wherein the emergency auxiliary valve mechanism (11) comprises a switching assembly (12), a mounting ring (13), a blocking ring (14), a plurality of opening and closing assemblies (15) and a plurality of return assemblies (16); a plurality of inner holes (17) are provided through the periphery of the valve seat (8); the mounting ring (13) is mounted on the periphery of the valve seat (8); and a plurality of pressure relief channels (18) are provided on the mounting ring (13) for connecting the corresponding inner holes (17) with the inlet flow channel (9). ), the opening and closing component (15) is installed on the mounting ring (13) for opening and closing the pressure relief channel (18), the blocking ring (14) is sleeved on the outer periphery of the valve seat (8), the blocking ring (14) is connected to the upper end of the mounting ring (13) through a plurality of return components (16) and blocks the outlet of the pressure relief channel (18), and the switching component (12) is used to drive the blocking ring (14) to move away from the mounting ring (13), so as to cause the outlet of the pressure relief channel (18) to be connected with the inlet flow channel (9).

2. The spring-loaded safety valve according to claim 1, characterized in that: The opening and closing assembly (15) comprises an opening and closing piston (19), an opening and closing spring (20) and a pressure regulating nut (21); the mounting ring (13) is provided with a thread groove (22), a middle cavity (23) and a water inlet hole (24) from the outside to the inside in sequence, and the inner diameters of the thread groove (22), the middle cavity (23) and the water inlet hole (24) are successively reduced; the upper end of the mounting ring (13) is provided with a water outlet hole (25) connected to the middle cavity (23); the water inlet hole (24), the middle cavity (23) and the water outlet hole (25) are connected to form the pressure relief channel (18); the opening and closing piston (19) is slidably arranged in the middle cavity (23), and the opening and closing piston (19) is provided with a water outlet hole (25) connected to the middle cavity (23). The outer periphery of the opening and closing piston (19) is tightly fitted with the inner periphery of the middle cavity (23), the outer periphery of the opening and closing piston (19) is provided with a plurality of guide grooves (26) extending in the axial direction, the pressure regulating nut (21) is threadedly connected in the thread groove (22), and the outer end of the pressure regulating nut (21) is provided with an inner hexagonal groove (27), the opening and closing spring (20) is clamped between the pressure regulating nut (21) and the opening and closing piston (19), and is used to press the opening and closing piston (19) against the inner end of the middle cavity (23) to block the water inlet hole (24), and the pressure regulating nut (21) and the opening and closing piston (19) are respectively provided with a first positioning groove (28) and a second positioning groove (29) for embedding the two ends of the opening and closing spring (20).

3. The spring-loaded safety valve according to claim 2, characterized in that: The mounting ring (13) is threadedly connected to the outer periphery of the valve seat (8); an annular groove (30) is provided on the outer periphery of the valve seat (8); and the inner hole (17) is connected to the water inlet hole (24) via the annular groove (30).

4. The spring-loaded safety valve according to claim 3, characterized in that: The return assembly (16) comprises a return rod (31), a return spring (32), an upper gasket (33) and a lower gasket (34); an upper hole (35) and a lower hole (36) are respectively formed on the blocking ring (14) and the mounting ring (13); the upper hole (35) and the corresponding lower hole (36) are coaxially arranged; the lower end of the mounting ring (13) is also provided with an active cavity (37) coaxial with the lower hole (36); the return rod (31) passes through the upper hole (35), the lower hole (36) and the active cavity ( 37), the outer periphery of the return rod (31) is clamped with a retaining spring (38) for limiting the upper gasket (33) to the upper end of the blocking ring (14), the outer periphery of the return rod (31) is threadedly connected with a limiting nut (39) corresponding to the position in the active cavity (37), the lower gasket (34) is arranged at the upper end of the limiting nut (39), the return spring (32) is arranged in the active cavity (37), and the two ends of the return spring (32) are respectively pressed against the upper end of the active cavity (37) and the upper end of the lower gasket (34).

5. The spring-loaded safety valve according to claim 4, characterized in that: A first sealing ring (40) for sealingly cooperating with the outer periphery of the valve seat (8) is respectively arranged at positions above and below the annular groove (30) on the inner periphery of the mounting ring (13); a second sealing ring (41) for sealingly cooperating with the outer periphery of the valve seat (8) is respectively arranged at the inner periphery of the blocking ring (14); a third sealing ring (42) for sealingly cooperating with the blocking ring (14) is respectively arranged at positions on the upper end of the mounting ring (13) corresponding to the outer periphery of each water outlet hole (25); and a fourth sealing ring (43) for sealingly cooperating with the blocking ring (14) is respectively arranged at positions on the upper end of the mounting ring (13) corresponding to the outer periphery of each lower hole (36).

6. The spring-loaded safety valve according to claim 1, characterized in that: The switching assembly (12) comprises an operating ring (44), a plurality of ejector pins (45) and a plurality of return springs (46). A plurality of guide grooves (47) are provided on the outer wall of the valve body (1). A guide hole (71) communicating with the inlet flow channel (9) is provided at the inner end of the guide groove (47). The ejector pin (45) passes through the guide hole (71) and extends into the inlet flow channel (9). An annular limiting portion (48) extending toward the outer periphery is provided at a position of the ejector pin (45) corresponding to the position in the guide groove (47). An O-ring (49) for forming a sealing fit with the inner periphery of the guide groove (47) is provided on the outer periphery of the annular limiting portion (48). The return spring (46) is sleeved on the outer periphery of the ejector pin (45), and one end of the return spring (46) abuts against the inner end of the guide groove (47), and the other end of the return spring (46) abuts against the inner end of the annular limiting portion (48). The ends of the ejector pin (45) abut against each other, the operating ring (44) is rotatably arranged on the outer periphery of the valve body (1), and a track groove (50) is provided on the operating ring (44) to match the outer end of the ejector pin (45), the track groove (50) includes a shallow groove portion (51), an inclined portion (52) and a deep groove portion (53) in sequence, the inner end of the ejector pin (45) is in a conical shape, and a conical recess (54) for inserting the ejector pin (45) is provided at the outer edge of the lower end of the blocking ring (14), when the outer end of the ejector pin (45) is located in the shallow groove portion (51), the blocking ring (14) and the mounting ring (13) abut against each other, and when the outer end of the ejector pin (45) is located in the deep groove portion (53), the inner end of the ejector pin (45) is inserted into the conical recess (54) and pushes the blocking ring (14) open, so that the outlet of the pressure relief channel (18) is connected to the inlet flow channel (9).

7. The spring-loaded safety valve according to claim 6, characterized in that: An annular limiting groove (55) is provided on the outer periphery of the valve body (1), and the operating ring (44) is rotatably disposed in the annular limiting groove (55).

8. The spring-loaded safety valve according to claim 7, characterized in that: The operating ring (44) comprises a left half ring (56) and a right half ring (57). A positioning convex portion (58) is respectively provided on the two end surfaces of the left half ring (56). A positioning concave portion (59) which matches with the corresponding positioning convex portion (58) is respectively provided on the two end surfaces of the right half ring (57). A mounting convex portion (72) is respectively provided on the side portions close to both ends of the left half ring (56). A buckle (60) is hingedly connected to the mounting convex portion (72). A clamping block (61) is respectively provided on the side portions close to both ends of the right half ring (57). The buckle (60) is buckled on the clamping block (61), and the clamping block (61) is provided with a clamping groove (62) for the buckle (60) to be embedded.

9. The spring-loaded safety valve according to claim 6, characterized in that: The operating ring (44) further comprises two operating plates (63), the mounting protrusion (72) is provided with a screw hole (64), the operating plate (63) is provided with a screw rod (65), and the screw rod (65) is threadedly connected to the screw hole (64) corresponding to the mounting protrusion (72).

10. The spring-loaded safety valve according to claim 1, characterized in that: The elastic component (4) comprises an adjusting screw sleeve (66), an upper spring seat (67), a lower spring seat (68) and an adjusting spring (69) which are sequentially sleeved on the outer periphery of the valve stem (3) from top to bottom. The adjusting screw sleeve (66) is threadedly connected to the upper end of the valve cover (2). A limiting step (70) is provided on the outer periphery of the valve stem (3). The two ends of the adjusting spring (69) act on the upper spring seat (67) and the lower spring seat (68) respectively, so that the upper spring seat (67) is pressed against the lower end of the adjusting screw sleeve (66), and at the same time, the lower spring seat (68) is pressed against the limiting step (70).

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