Anti-chattering high temperature and high pressure spring safety valve

Abstract

The present application relates to a kind of anti-chattering high temperature high pressure spring type safety valve, belong to valve technical field, including valve body, valve seat, valve clapper, guide sleeve, valve cover, valve rod and spring pressure setting device, the back of valve clapper is dynamically cooperated with the inner hole of guide sleeve by recoil disc;Its characterized is that: heat insulation cavity is arranged between the upper end surface of valve body cavity and the lower end surface of valve cover, anti-chattering device is arranged in the heat insulation cavity between heat insulation cavity and valve rod;When chattering occurs, valve rod moves up and down repeatedly with valve clapper quickly, causes anti-chattering sleeve and positioning sleeve of anti-chattering device to form anti-chattering cavity, utilize the damping effect of medium in anti-chattering cavity, prevent valve rod to move quickly, eliminate valve clapper chattering phenomenon, ensure the sealing performance of valve clapper and product service life and the safety of valve and system equipment.

Description

Technical Field

[0001] This invention relates to a safety valve, and more particularly to a high-temperature, high-pressure spring-loaded safety valve. Background Technology

[0002] A typical spring-loaded safety valve consists of a valve body, valve seat, valve disc, guide sleeve, valve cover, and spring pressure setting device. The center of the upper end face of the valve disc contacts the push rod of the spring pressure setting device. When the inlet medium pressure exceeds the set pressure value of the spring pressure setting device, the medium pressure pushes the valve disc to open, releasing the inlet pressure to the outlet, preventing system overpressure and protecting system equipment. However, under special conditions, safety valves may experience chattering during discharge. This means that during discharge, the valve disc vibrates rapidly and abnormally without contacting the valve seat. This high-frequency chattering can cause metal fatigue, leading to decreased mechanical properties of components, valve disc seal failure, and reduced valve lifespan. In severe cases, it can even completely damage the valve and create safety hazards for system equipment. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a high-temperature, high-pressure, anti-flutter spring-loaded safety valve that eliminates flutter during the discharge process, ensures sealing performance and product lifespan, and reliably eliminates safety hazards in valves and system equipment.

[0004] The technical solution for realizing the present invention is as follows:

[0005] A high-temperature, high-pressure spring-loaded safety valve with anti-flutter properties includes a valve body, valve seat, valve disc, guide sleeve, valve cover, valve stem, and spring pressure setting device. The guide sleeve is fixedly mounted on the upper end face of the valve body cavity by an upper radial annular shoulder. The lower end face of the valve disc has a sealing surface that mates with the valve seat. The back of the valve disc is dynamically fitted with the inner hole of the guide sleeve through a backflush disc. The spring pressure setting device is located in the inner cavity of the valve cover and includes a spring and an adjusting screw sleeve. The spring is mounted on the outer periphery of the valve stem through a lower spring seat and an upper spring seat. The adjusting screw sleeve is threaded onto the upper end of the valve cover, with its lower end pressing against the upper end face of the upper spring seat. The lower end of the valve stem presses against the center of the upper end face of the backflush disc. The valve body cavity upper end face and valve cover lower end face are characterized by the presence of heat insulation between the upper end face of the valve body cavity and the lower end face of the valve cover. The cavity includes an anti-flutter device installed within the insulation cavity between the insulation cavity and the valve stem. The anti-flutter device comprises an anti-flutter groove and a wave groove on the valve stem, a positioning sleeve fixed to the insulation cavity, an anti-flutter sleeve movably fitted onto the outer surface of the positioning sleeve, an anti-flutter bolt located in a radial hole at the lower part of the anti-flutter sleeve, and a positioning bolt located between the upper part of the anti-flutter sleeve and the positioning sleeve. The inner hole of the positioning sleeve movably engages with the outer surface of the valve stem, the wave groove is located within the inner hole of the positioning sleeve, and the lower end of the anti-flutter sleeve has a guide hole that movably engages with the outer surface of the valve stem. The upper surface of this guide hole and the lower end face of the positioning sleeve form the anti-flutter cavity. The anti-flutter bolt consists of a lower locking rod and a lower spring, the lower locking rod being movably inserted into the radial hole of the anti-flutter sleeve. The inner end face of the valve stem contacts the outer circular surface of the valve stem. The lower spring is installed between the radial shoulder of the lower clamping rod and the inner step of the radial hole of the anti-vibration sleeve. The positioning bolt includes a sensing hole on the positioning sleeve, a delay cavity on the anti-vibration sleeve, an inner sensing ball and an outer sensing ball installed in the sensing hole, a sensing spring installed between the inner and outer sensing balls, an upper clamping rod installed in the delay cavity, a delay spring between the outer end face of the upper clamping rod and the delay cavity, and a locking device on the upper side of the upper clamping rod. The delay cavity has a delay hole that connects to the heat insulation cavity. The locking device consists of a locking rod and a locking spring. The locking rod is installed in the locking hole between the upper end face of the anti-vibration sleeve and the delay cavity, and its lower end contacts the outer circular surface of the upper clamping rod. The locking spring is installed by a threaded sleeve. On the radial step in the middle of the locking rod; in the normal working state of the valve, the center line of the delay cavity and the sensing hole are aligned with the trough in the middle of the waveform groove, the inner sensing ball is inserted into the trough, and the delay spring pushes the inner end of the upper locking rod into the sensing hole; the upper locking rod has two cylinders of different diameters, the outer cylindrical surface of the larger diameter cylinder is in movable fit with the delay cavity, when the smaller diameter cylinder of the upper locking rod is inserted into the sensing hole, the lower end of the locking rod touches the outer cylindrical surface of the larger diameter cylinder of the upper locking rod, when the end face of the smaller diameter cylinder of the upper locking rod touches the outer cylindrical surface of the positioning sleeve, the lower end of the locking rod touches the outer cylindrical surface of the smaller diameter cylinder of the upper locking rod, and the side of the locking rod is stuck on the annular step between the larger diameter cylinder and the smaller diameter cylinder of the upper locking rod.

[0006] A preferred embodiment is to provide a reset operation window on the side wall of the heat insulation cavity, and to provide a heat insulation sealing plate on the reset operation window.

[0007] A preferred embodiment is that the upper end of the positioning sleeve is provided with a radial annular shoulder, and the outer circular surface of the radial annular shoulder is fixedly connected to the inner circular wall of the heat insulation cavity by threads.

[0008] The beneficial effects of this invention compared with the prior art are as follows: An anti-flutter device is installed in the heat insulation cavity between the upper end face of the valve body cavity and the lower end face of the valve cover and the heat insulation cavity between the valve stem. When flutter occurs, the valve stem moves up and down rapidly and repeatedly with the valve disc, resulting in the formation of an anti-flutter cavity between the anti-flutter sleeve and the positioning sleeve of the anti-flutter device. The damping effect of the medium in the anti-flutter cavity is used to prevent the valve stem from moving rapidly, eliminate the valve disc flutter phenomenon, and ensure the sealing performance of the valve disc, the service life of the product, and the safety of the valve and system equipment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention in its normal closed state.

[0010] Figure 2 This is a schematic diagram of the structure of the present invention in its normal open state.

[0011] Figure 3 This is a schematic diagram of the anti-flutter state of the present invention.

[0012] Figure 4 This is the present invention. Figure 1 Enlarged view of the local structure at point A in the middle.

[0013] Figure 5 This is the present invention. Figure 3 Enlarged view of the local structure at point B in the middle.

[0014] In the diagram: 1 Valve body, 2 Valve seat, 3 Adjusting ring, 4 Valve disc, 5 Backflush disc, 6 Guide sleeve, 7 Valve stem, 8 Insulation cavity, 9 Wave groove, 10 Anti-vibration sleeve, 11 Positioning sleeve, 12 Lower spring seat, 13 Spring, 14 Valve cover, 15 Upper spring seat, 16 Adjusting screw sleeve, 17 Valve cap, 18 Insulation cavity, 19 Anti-vibration cavity, 20 Insulation sealing plate, 21 Valley, 22 Peak, 23 Upper locking rod, 24 Sensing hole, 25 Inner sensing ball, 26 Sensing spring, 27 Outer sensing ball, 28 Locking rod, 29 Locking spring, 30 Delay cavity, 31 Delay spring, 32 Delay hole, 33 Lower locking rod, 34 Lower spring, 35 Anti-vibration slot. Detailed Implementation

[0015] like Figure 1 , Figure 2 , Figure 3The anti-flutter high-temperature and high-pressure spring-loaded safety valve shown includes a valve body 1, a valve seat 2, a valve disc 4, a guide sleeve 6, a valve cover 14, a valve stem 7, and a spring pressure setting device. The guide sleeve 6 is fixedly installed on the upper end face of the cavity of the valve body 1 by an upper radial annular shoulder. The lower end face of the valve disc 4 has a sealing surface that cooperates with the valve seat 2. The back of the valve disc 4 is dynamically engaged with the inner hole of the guide sleeve 6 through a backwash plate 5. An adjusting ring 3 is set on the outer side of the sealing surface of the valve seat 2 to adjust the return speed of the valve disc 4. The spring pressure setting device is set on the valve cover 1. 4. The inner cavity includes a spring 13 and an adjusting sleeve 16. The spring 13 is mounted on the outer periphery of the valve stem 7 via a lower spring seat 12 and an upper spring seat 15. The adjusting sleeve 16 is threaded onto the upper end of the valve cover 14, with its lower end pressing against the upper end face of the upper spring seat 15. The lower end of the valve stem 7 presses against the center of the upper end face of the backwash plate 5. Rotating the adjusting sleeve 16 adjusts the compression force of the spring 13, setting the set pressure value of the spring pressure setting device. When the inlet medium pressure of the valve body 1 is less than the set pressure value, the valve disc 4 is in contact with the spring 13. 3. Under pressure, the valve body 1 is pressed tightly and sealed with the valve seat 2. When the inlet medium pressure of the valve body 1 is greater than the set pressure value, the medium pressure overcomes the elastic force of the spring 13, pushing the valve disc 4 to open, releasing the inlet medium pressure of the valve body 1, preventing overpressure in the medium pipeline on the inlet side of the valve body 1, and protecting the pipeline and equipment safety. A valve cap 17 is provided on the valve cover 14 at the upper end of the adjusting screw sleeve 16 to prevent dust from entering the adjusting screw sleeve. Its characteristic is that a heat insulation cavity 8 is provided between the upper end face of the middle cavity of the valve body 1 and the lower end face of the valve cover 14. An anti-flutter device is installed in the heat insulation cavity 18 between the valve body 8 and the valve stem 7. The heat insulation cavity 8 is a cylindrical structure and is fixedly and sealed between the valve cover 14 and the valve body 1 by screws and nuts. The anti-flutter device includes an anti-flutter groove 35 and a wave groove 9 on the valve stem 7, a positioning sleeve 11 fixed on the heat insulation cavity 8, an anti-flutter sleeve 10 movably fitted on the outer circumference of the positioning sleeve 11, an anti-flutter bolt set in the radial hole at the lower part of the anti-flutter sleeve 10, and a positioning bolt set between the upper part of the anti-flutter sleeve 10 and the positioning sleeve 11. Figure 4 As shown; the inner hole of the positioning sleeve 11 is movably fitted with the outer circular surface of the valve stem 7, allowing the valve stem 7 to move freely axially within the inner hole of the positioning sleeve 11. The wave groove 9 is located within the inner hole of the positioning sleeve 11, that is, the wave groove 9 is composed of several annular arc grooves on the outer circular surface of the valve stem 7 located within the inner hole of the positioning sleeve 11. The lower end of the anti-vibration sleeve 10 has a guide hole that movably fits with the outer circular surface of the valve stem 7, ensuring the stability of the up-and-down movement of the anti-vibration sleeve 10. The upper plane of this guide hole and the lower end face of the positioning sleeve 11 form an anti-vibration cavity 19, as shown. Figure 5As shown; the anti-vibration plug consists of a lower locking rod 33 and a lower spring 34. The lower locking rod 33 is movably inserted into the radial hole of the anti-vibration sleeve 10, with its inner end face contacting the outer circular surface of the valve stem 7. The lower spring 34 is installed between the radial shoulder of the lower locking rod 33 and the inner step of the radial hole of the anti-vibration sleeve 10. That is, the lower locking rod 33 is composed of two cylindrical sections of different diameters, and the radial hole of the anti-vibration sleeve 10 is composed of circular holes that dynamically fit with the two cylindrical sections of the lower locking rod 33. The three large-diameter cylindrical end faces contact the outer circular surface of the valve stem 7. The lower spring 34 is installed between the radial shoulder at the connection of the two cylindrical sections of the lower clamping rod 33 and the inner step of the radial hole of the anti-vibration sleeve 10, pushing the lower clamping rod 33 towards the valve stem 7 to press it into contact. The positioning bolt includes a sensing hole 24 on the positioning sleeve 11, a delay cavity 30 on the anti-vibration sleeve 10, an inner sensing ball 25 and an outer sensing ball 27 installed in the sensing hole 24, and a bolt installed between the inner sensing ball 25 and the outer sensing ball 27. The system includes a sensing spring 26 between the balls 27, an upper locking rod 23 installed in the delay cavity 30, a delay spring 31 between the outer end face of the upper locking rod 23 and the delay cavity 30, and a locking device on the upper side of the upper locking rod 23; the delay cavity 30 is provided with a delay hole 32 connecting to the heat insulation cavity 18; the locking device consists of a locking rod 28 and a locking spring 29, the locking rod 28 is installed in the locking hole between the upper end face of the anti-vibration sleeve 10 and the delay cavity 30, and its lower end is connected to the upper locking rod 23. The outer circular surface touches the locking spring 29, which is installed on the radial step in the middle of the locking rod 28 by a screw sleeve, pressing the locking rod 28 downward to contact the outer circular surface of the upper locking rod 23; in the normal working state of the valve, the center line of the delay cavity 30 and the sensing hole 24 is aligned with the trough 21 in the middle of the waveform groove 9, the inner sensing ball 25 is inserted into the trough 21, and the delay spring 31 pushes the inner end of the upper locking rod 23 into the sensing hole 24, connecting the anti-vibration sleeve 10 and the positioning sleeve 11 into one piece, such as Figure 4As shown, during normal valve discharge, the valve stem 7 rises and falls rapidly once. The pressure in the delay chamber 30 cannot be released in time. The sum of the pressure in the delay chamber 30 and the elastic force of the delay spring 31 is greater than the elastic force of the sensing spring 26, ensuring that the inner end of the upper locking rod 23 is always inserted into the sensing hole 24, thus ensuring normal discharge of the valve stem 7 and valve disc 4. In other words, the anti-flutter device does not affect the normal discharge of the safety valve. The upper locking rod 23 consists of two cylinders of different diameters. The outer cylindrical surface of the larger diameter cylinder is movablely fitted with the delay chamber 30, allowing... The upper locking rod 23 can move within the delay cavity 30. When the small-diameter cylinder of the upper locking rod 23 is inserted into the sensing hole 24, the lower end of the locking rod 28 contacts the outer cylindrical surface of the large-diameter cylinder of the upper locking rod 23. When the end face of the small-diameter cylinder of the upper locking rod 23 contacts the outer cylindrical surface of the positioning sleeve 11, the lower end of the locking rod 28 contacts the outer cylindrical surface of the small-diameter cylinder of the upper locking rod 23, and the side of the locking rod 28 is locked on the annular step between the large-diameter cylinder and the small-diameter cylinder of the upper locking rod 23, thus locking the upper locking rod 23 in the delay cavity 30. When valve chatter occurs during the discharge process, the inner sensing ball 25 repeatedly moves rapidly between the trough 21 and crest 22 of the waveform groove 9. The inner sensing ball 25 is in contact with the crest 22, giving the medium pressure in the delay chamber 30 sufficient time to be discharged from the delay hole 32. The upper locking rod 23 is pushed out of the sensing hole 24 by the outer sensing ball 27 and locked in the delay chamber 30 by the locking rod 28. The anti-chatter sleeve 10 moves downwards under gravity, and the lower locking rod 33 is pushed into the anti-chatter groove 35 by the lower spring 34. An anti-chatter cavity 19 is formed between the anti-chatter sleeve 10 and the lower end face of the positioning sleeve 11. This anti-chatter cavity 19 effectively prevents the valve stem 7 from moving up and down, eliminating valve chatter. Figure 5 As shown; the safety valve chatter is an occasional abnormal phenomenon. After the chatter disappears, the anti-chatter device needs to be reset, that is, the lower locking rod 33 is pulled out from the anti-chatter slot 35, the anti-chatter sleeve 10 is moved up, the locking rod 28 is pulled up, so that the upper locking rod 23 is inserted into the sensing hole 24. By selecting the parameters of the delay spring 31 and the sensing spring 26, when the inner sensing ball 25 is located in the trough 21, the end of the upper locking rod 23 is inserted into the sensing hole 24, and when the inner sensing ball 25 is located at the crest 22, the upper locking rod 23 is pushed out of the sensing hole 24. That is, when the inner sensing ball 25 is embedded in the trough 21, the elastic force of the delay spring 31 is greater than the elastic force of the sensing spring 26, and when the inner sensing ball 25 is at the crest 22, the elastic force of the delay spring 31 is less than the elastic force of the sensing spring 26.

[0016] A reset operation window is provided on the side wall of the heat insulation cavity 8. A heat insulation sealing plate 20 is provided on the reset operation window. After the flutter phenomenon is eliminated, the heat insulation sealing plate 20 is opened, and the anti-flutter device is reset through the reset operation window.

[0017] The upper end of the positioning sleeve 11 is provided with a radial annular shoulder, and the outer circular surface of the radial annular shoulder is fixedly connected to the inner circular wall of the heat insulation cavity 8 by threads.

[0018] In this invention, directional terms such as "upper," "lower," "inner," and "outer" refer to the directions shown in the accompanying drawings for ease of description and should not be construed as limiting the scope of the invention.

Claims

1. A spring-loaded safety valve for high temperature and high pressure with anti-flutter function, comprising a valve body (1), a valve seat (2), a valve disc (4), a guide sleeve (6), a valve cover (14), a valve stem (7), and a spring pressure setting device, wherein the back of the valve disc (4) is dynamically engaged with the inner hole of the guide sleeve (6) through a backwash plate (5), and the spring pressure setting device is disposed in the inner cavity of the valve cover (14); characterized in that: A heat insulation cavity (8) is provided between the upper end face of the cavity of the valve body (1) and the lower end face of the valve cover (14). An anti-flutter device is provided in the heat insulation cavity (18) between the heat insulation cavity (8) and the valve stem (7). The anti-flutter device includes an anti-flutter groove (35) and a wave groove (9) on the valve stem (7), a positioning sleeve (11) fixed on the heat insulation cavity (8), an anti-flutter sleeve (10) movably fitted on the outer circumference of the positioning sleeve (11), an anti-flutter bolt set in the radial hole at the lower part of the anti-flutter sleeve (10), and a positioning bolt set between the upper part of the anti-flutter sleeve (10) and the positioning sleeve (11). The positioning sleeve (11) The inner hole is movable to the outer circular surface of the valve stem (7), and the wave groove (9) is located in the inner hole of the positioning sleeve (11). The lower end of the anti-vibration sleeve (10) has a guide hole that is movable to the outer circular surface of the valve stem (7). The upper plane of the guide hole and the lower end face of the positioning sleeve (11) form an anti-vibration cavity (19). The anti-vibration bolt consists of a lower locking rod (33) and a lower spring (34). The lower locking rod (33) is movably inserted into the radial hole of the anti-vibration sleeve (10), and its inner end face contacts the outer circular surface of the valve stem (7). The lower spring (34) is installed on the radial shoulder of the lower locking rod (33) and the inner step of the radial hole of the anti-vibration sleeve (10). The positioning bolt includes a sensing hole (24) on the positioning sleeve (11), a delay cavity (30) on the anti-vibration sleeve (10), an inner sensing ball (25) and an outer sensing ball (27) installed in the sensing hole (24), a sensing spring (26) installed between the inner sensing ball (25) and the outer sensing ball (27), an upper locking rod (23) installed in the delay cavity (30), a delay spring (31) between the outer end face of the upper locking rod (23) and the delay cavity (30), and a locking device on the upper side of the upper locking rod (23); the delay cavity (30) is provided with a delay hole (32) that connects to the heat insulation cavity (18). The locking device consists of a locking rod (28) and a locking spring (29). The locking rod (28) is installed in the locking hole between the upper end face of the anti-vibration sleeve (10) and the delay cavity (30). Its lower end is in contact with the outer circle of the upper locking rod (23). The locking spring (29) is installed on the radial step in the middle of the locking rod (28) by a screw sleeve. When the valve is in normal working condition, the center line of the delay cavity (30) and the sensing hole (24) is aligned with the trough (21) in the middle of the waveform groove (9). The inner sensing ball (25) is inserted into the trough (21). The delay spring (31) pushes the inner end of the upper locking rod (23) into the sensing hole (24).The upper locking rod (23) consists of two cylinders of different diameters. The outer cylindrical surface of the larger diameter cylinder is in movable engagement with the delay cavity (30). When the smaller diameter cylinder of the upper locking rod (23) is inserted into the sensing hole (24), the lower end of the locking rod (28) touches the outer cylindrical surface of the larger diameter cylinder of the upper locking rod (23). When the end face of the smaller diameter cylinder of the upper locking rod (23) touches the outer cylindrical surface of the positioning sleeve (11), the lower end of the locking rod (28) touches the outer cylindrical surface of the smaller diameter cylinder of the upper locking rod (23), and the side of the locking rod (28) is locked on the annular step between the larger and smaller diameter cylinders of the upper locking rod (23).

2. The anti-flutter high-temperature and high-pressure spring-loaded safety valve according to claim 1, characterized in that: A reset operation window is provided on the side wall of the heat insulation cavity (8), and a heat insulation sealing plate (20) is provided on the reset operation window.

3. The anti-flutter high-temperature and high-pressure spring-loaded safety valve according to claim 1 or 2, characterized in that: The upper end of the positioning sleeve (11) is provided with a radial annular shoulder, and the outer circular surface of the radial annular shoulder and the inner circular wall of the heat insulation cavity (8) are fixedly connected to each other by threads.

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