Anti-flutter spring type safety valve

Abstract

The invention relates to an anti-flutter spring type safety valve, belongs to the technical field of valves, and aims to solve the problems of abrasion and system instability caused by quick movement of a valve rod during flutter of an existing spring type safety valve. The safety valve comprises a valve body, a valve rod, a valve cover, a valve clack, a main spring and other core components, a valve bonnet structure is additionally arranged at the top of the valve cover, and an upper bonnet cavity (storing buffer liquid) and a lower bonnet cavity are divided in the valve bonnet structure and communicated through an upper through hole in a partition plate. A scraper is mounted at the top of the valve rod and quickly moves along with the valve rod when flutter occurs to cut off the plastic plug rod in the cutting cavity; the plastic plug rod moves inwards under the action of the side thrust spring, so that the side groove is aligned with the upper through hole, liquid flows into the lower cap cavity and then enters the cover cavity through the middle through hole in the valve cover, viscous resistance is applied to the lower spring seat, and therefore movement of the valve rod is slowed down, and flutter is eliminated. Liquid buffering is activated through mechanical cut-off, automatic flutter blocking is achieved, the valve abrasion risk is remarkably reduced, the service life is prolonged, and safety and stability of a system are guaranteed.

Description

Technical Field

[0001] This invention relates to an improved safety valve, and more particularly to an improved safety valve with a chatter-resistant spring. Background Technology

[0002] A spring-loaded safety valve is a type of valve that uses the preload of a spring to balance the force of the medium. When the system pressure exceeds the preset safety pressure, it automatically opens to release pressure, and automatically closes when the pressure drops to the preset reseating pressure.

[0003] The main drawback of existing spring-loaded safety valves is chattering. During operation, when a spring-loaded safety valve opens, the pipeline may vibrate, or other factors may cause vibration. When the pipeline vibration matches the spring's natural frequency, the valve disc and back-and-forth movement occurs, but the valve disc does not contact the valve seat. This leads to rapid up-and-down movement of the valve stem, causing friction and wear, and even valve malfunction. Chattering not only accelerates wear on valve components but can also cause instability in the pipeline system, threatening equipment safety. Traditional safety valves use a purely mechanical spring design, lacking a dynamic buffering mechanism and vibration damping function, relying solely on valve seat contact damping. In a resonant state, they cannot effectively stop chattering. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a flutter spring type safety valve.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This type of flutter spring-type safety valve includes a valve body, a valve stem, and a valve cover. The valve body has an inlet cavity at the bottom and an outlet cavity at the side, respectively connecting to the valve chamber. A valve seat is provided in the inlet cavity. The valve stem is movable up and down and passes through the upper end of the valve body. A backflush plate is provided at the lower end of the valve stem, and a valve disc is provided inside the backflush plate. The valve disc and the valve seat are sealed together. The valve cover is located at the upper end of the valve body. An upper spring seat, a lower spring seat, and a main spring are provided on the valve stem inside the valve cover. The lower spring seat can move up and down with the valve stem. The valve cover is characterized by having a cover cavity inside, and a lower end cover is provided at the lower end of the valve cover and sealed therewith. A valve cap is provided at the top of the valve cover. The valve cap has an upper cap cavity, a lower cap cavity, and a partition plate inside. The upper cap cavity stores a buffer solution, and the partition plate... The valve has an upper through hole connecting the upper and lower cap cavities. The valve stem seal passes through the valve cover and extends into the lower cap cavity. A scraper is provided at the top of the valve stem, which can move up and down rapidly with the valve stem when chatter occurs. A cutting cavity and a limiting block are provided on the partition plate corresponding to the scraper. The limiting block is in a limiting fit with the scraper. A plastic plug rod is provided in the cutting cavity. The side of the plastic plug rod is in a sealing fit with the upper through hole. The plastic plug rod is equipped with a side push spring. The plastic plug rod can be cut by the scraper and moved inward by the side push spring. A side groove is provided on the side of the plastic plug rod. When the plastic plug rod moves inward to a set position, the side groove connects to the upper through hole, and the liquid in the upper cap cavity can flow into the lower cap cavity. The valve cover has a central through hole connecting the cover cavity and the lower cap cavity. When the liquid enters the cover cavity, it applies resistance to the lower spring seat to slow down the movement of the valve stem and eliminate chatter.

[0006] The outer end of the plastic plug rod is connected to an indicator rod, which can move through the valve cap and its side fixing plug. The indicator rod is used to monitor the movement position of the plastic plug rod. When the indicator rod moves to be flush with the side fixing plug, it indicates that the side groove is fully connected to the upper through hole, and the plastic plug rod needs to be replaced.

[0007] The valve cover is provided with a lower through hole, and the lower through hole is equipped with a lower plug, through which liquid can be discharged.

[0008] The backflush disc is equipped with a guide sleeve, which guides the up-and-down movement of the backflush disc. The guide sleeve is fixed between the valve body and the valve cover.

[0009] The upper cap cavity is provided with a liquid filling hole, and the liquid filling hole is equipped with an upper plug.

[0010] The upper end of the scraper is provided with a storage cavity in the middle, which can hold the cut and fallen plastic plug rod.

[0011] The valve stem has a step, which forms the lower limit of the lower spring seat. The valve stem has an adjusting sleeve, which is threaded onto the valve cover and forms the upper limit of the upper spring seat. The main spring is located between the upper spring seat and the lower spring seat.

[0012] The beneficial effects of this invention are that the improved anti-chatter spring-type safety valve integrates a scraper and a plastic plug rod, activates liquid flow through gradual cut-off, automatically triggers buffering, and uses the viscous resistance of the liquid to slow down the movement of the lower spring seat and valve stem, automatically preventing chatter, protecting the valve system, extending valve life, and reducing the risk of wear. Attached Figure Description

[0013] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the valve in the closed state according to the present invention.

[0015] Figure 2 This is a schematic diagram of the valve's open state according to the present invention.

[0016] Figure 3 For the present invention Figure 1 Enlarged view of part A.

[0017] Figure 4 For the present invention Figure 2 Enlarged view of part B. Detailed Implementation

[0018] The accompanying drawings illustrate the structure of the present invention, and further details will be described below in conjunction with the drawings. In this embodiment, see the attached drawings. Figure 1-4The flutter spring-type safety valve includes a valve body 1, a valve stem 2, and a valve cover 3. The valve body 1 has an inlet 4 at the bottom of the valve cavity and an outlet 5 at the side, which respectively connect to the valve chamber. A valve seat 6 is provided in the inlet 4. The valve stem 2 is movable up and down and passes through the upper end of the valve body 1. A backflush plate 7 is provided at the lower end of the valve stem 2. A valve disc 8 is provided in the backflush plate 7. The valve disc 8 is sealed with the valve seat 6. The valve cover 3 is located at the upper end of the valve body 1. The valve stem 2 inside the valve cover 3 is provided with an upper spring seat 9, a lower spring seat 10, and a main spring 11. The lower spring seat 10 can move up and down with the valve stem 2. The valve cover 3 is moved downwards. It has a cover cavity 12 inside, and a lower end cover 13 is sealed to it at the lower end. A valve cap 14 is provided at the top of the valve cover 3. The valve cap 14 has an upper cap cavity 15, a lower cap cavity 16, and a partition plate 17. The valve cap 14 is divided into the upper cap cavity 15 and the lower cap cavity 16 by the partition plate 17. A buffer solution 18 is stored in the upper cap cavity 15. An upper through hole 19 is provided on the partition plate 17 connecting the upper cap cavity 15 and the lower cap cavity 16. The valve stem 2 passes through the valve cover 3 and extends into the lower cap cavity 16. A scraper 20 is provided at the top of the valve stem 2. Specifically, the scraper 20 is fixed to the connecting rod 21, which is fixed to the top of the valve stem 2 via the connecting sleeve 22. The scraper 20 can move up and down rapidly with the valve stem 2 when chatter occurs. The partition plate 17 corresponding to the scraper 20 is provided with a cutting cavity 23 and a limiting block 24. The limiting block 24 is in a limiting fit with the scraper 20 and acts as a blade pad. A plastic plug rod 25 is provided in the cutting cavity 23. The side of the plastic plug rod 25 is sealed to the upper through hole 19. The plastic plug rod 25 is equipped with a side push spring 26. The plastic plug rod 25 can be cut by the scraper 20. The valve stem 25 is moved inward by the side push spring 26. The plastic stopper 25 has a side groove 27 on its side. When the plastic stopper 25 moves inward to a set position, the side groove 27 connects to the upper through hole 19, allowing the buffer solution 18 in the upper cap cavity 15 to flow into the lower cap cavity 16. This unidirectional, gradual opening prevents the valve stem 2 from jamming due to the instantaneous impact of the buffer solution 18. The valve cover 3 has a central through hole 28 connecting the cover cavity 12 and the lower cap cavity 16. When the buffer solution 18 enters the cover cavity 12, it applies resistance to the lower spring seat 10 to slow the movement of the valve stem 2 and eliminate chatter. The plastic stopper 25 includes a connected rod body and a seat body. The rod body is cut by the scraper 20, and the seat body is sealed to the upper through hole 19. The seat body has a side groove 27 and a limiting cavity for the side push spring 26 to extend into.

[0019] As a further improved embodiment, an indicator rod 29 is connected to the outer end of the plastic plug rod 25. The indicator rod 29 extends into the limiting cavity and can move out of the valve cap 14 and its side fixing plug 30. The indicator rod 29 is used to monitor the movement position of the plastic plug rod 25. When the indicator rod 29 moves to be flush with the side fixing plug 30, it indicates that the side groove 27 is fully connected to the upper through hole 19, at which point the plastic plug rod 25 needs to be replaced. Visual monitoring of the displacement of the plastic plug rod 25 enables preventive maintenance and reduces the rate of sudden failures.

[0020] As a further improved embodiment, the valve cover 3 is provided with a lower through hole 31, and the lower through hole 31 is equipped with a lower plug 32. Liquid can be discharged through the lower through hole 31, the system can be quickly reset, and maintenance time can be shortened.

[0021] As a further improved specific implementation, the backflush disc 7 is equipped with a guide sleeve 33, which guides the up and down movement of the backflush disc 7. The guide sleeve 33 is fixed between the valve body 1 and the valve cover 3 to improve the stability of the movement of the backflush disc 7 and avoid swaying.

[0022] As a further improved embodiment, the upper cap cavity 15 is provided with a liquid filling hole, which is equipped with an upper plug 34 to support buffer replenishment.

[0023] As a further improvement, the scraper 20 has a storage cavity 35 located in the middle at the upper end. The storage cavity 35 can collect the cut and fallen plastic plug rod 25 fragments to prevent the fragments from entering the buffer system and ensure long-term operational reliability.

[0024] As a further improved specific implementation, the valve stem 2 is provided with a step 36, which forms the lower limit position of the lower spring seat 10. The valve stem 2 is provided with an adjusting screw sleeve 37, which is threadedly connected to the valve cover 3 and forms the upper limit position of the upper spring seat 9. The main spring 11 is limited between the upper spring seat 9 and the lower spring seat 10. The main spring 11 generates a downward pressing force on the lower spring seat 10 and the valve stem 2. When the valve stem 2 moves upward against the elastic force, it drives the lower spring seat 10 to move upward.

[0025] The working principle of this invention is as follows: When the pipe vibration causes the valve stem 2 to move rapidly up and down, the scraper 20 moves accordingly, repeatedly cutting the plastic plug rod 25. The plastic plug rod 25 moves inward under the action of the side push spring 26, that is, it moves from the cutting cavity 23 to the receiving cavity. The plastic plug rod 25 moves inward until the side groove 27 aligns with the upper through hole 19. The liquid in the upper cap cavity 15 flows into the lower cap cavity 16 through the upper through hole 19, and then enters the cover cavity 12 through the middle through hole 28. After the liquid fills the cover cavity 12, the lower spring seat 10 is immersed in it. The rapid movement of the valve stem 2 is resisted by the viscosity of the liquid. Force suppression reduces amplitude until flutter stops; after flutter stops, the liquid can be drained by unscrewing the lower plug 32 hole; during normal operation, opening the valve causes the valve stem 2 to move upward, driving the scraper 20 to cut a small section of the plastic plug rod 25. The side groove 27 will not connect to the upper through hole 19. After opening the valve multiple times, the plastic plug rod 25 will be gradually consumed. The length of the plastic plug rod 25 can be observed through the indicator rod 29. When the indicator rod 29 moves to be flush with the side fixed plug 30, it indicates that the side groove 27 has completely connected to the upper through hole 19. At this time, the plastic plug rod 25 needs to be replaced.

[0026] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A spring-loaded safety valve for preventing chattering, comprising a valve body, a valve stem, and a valve cover. The valve body has an inlet chamber at the bottom and an outlet chamber at the side, respectively connecting to the valve cavity. A valve seat is provided in the inlet chamber. The valve stem is movable up and down and passes through the upper end of the valve body. A backflow disc is provided at the lower end of the valve stem, and a valve disc is provided inside the backflow disc. The valve disc and the valve seat are sealed together. The valve cover is located at the upper end of the valve body. An upper spring seat, a lower spring seat, and a main spring are provided on the valve stem inside the valve cover. The lower spring seat can move up and down with the valve stem. The valve valve is characterized by: The valve cover has a cover cavity, and a lower end cover is fitted and sealed to it at the lower end. A valve cap is provided at the top of the valve cover, and the valve cap contains an upper cap cavity, a lower cap cavity, and a partition plate. The upper cap cavity stores a buffer solution, and the partition plate has an upper through hole connecting the upper and lower cap cavities. The valve stem passes through the valve cover and extends into the lower cap cavity. A scraper is provided at the top of the valve stem, which can move rapidly up and down with the valve stem during flutter. The partition plate corresponding to the scraper has a cutting cavity and a limiting block, and the limiting block and scraper are matched for limiting movement. The valve cover has a plastic stopper rod inside the cutting cavity. The side of the plastic stopper rod is sealed to the upper through hole. The plastic stopper rod is equipped with a side push spring. The plastic stopper rod can be cut by the scraper and moved inward by the side push spring. The side of the plastic stopper rod has a side groove. When the plastic stopper rod moves inward to a set position, the side groove connects to the upper through hole, and the liquid in the upper cap cavity can flow into the lower cap cavity. The valve cover has a central through hole connecting the cap cavity and the lower cap cavity. When the liquid enters the cap cavity, it applies resistance to the lower spring seat to slow down the movement of the valve rod and eliminate chatter.

2. The anti-chatter spring safety valve as described in claim 1, characterized in that: The outer end of the plastic plug rod is connected to an indicator rod, which can move through the valve cap and its side fixing plug. The indicator rod is used to monitor the movement position of the plastic plug rod. When the indicator rod moves to be flush with the side fixing plug, it indicates that the side groove is fully connected to the upper through hole, and the plastic plug rod needs to be replaced.

3. The anti-chatter spring safety valve as described in claim 1, characterized in that: The valve cover is provided with a lower through hole, which is equipped with a lower plug, allowing liquid to be discharged through the lower through hole.

4. The anti-chatter spring safety valve as described in claim 1, characterized in that: The backflush disc is equipped with a guide sleeve, which guides the up-and-down movement of the backflush disc. The guide sleeve is fixed between the valve body and the valve cover.

5. The anti-chatter spring safety valve as described in claim 1, characterized in that: The upper cap cavity is provided with a liquid filling hole, and the liquid filling hole is equipped with an upper plug.

6. The anti-chatter spring safety valve as described in claim 1, characterized in that: The upper end of the scraper is provided with a storage cavity in the middle, which can hold the cut and fallen plastic plug rod.

7. The anti-chatter spring safety valve as described in claim 1, characterized in that: The valve stem has a step, which forms the lower limit of the lower spring seat. The valve stem has an adjusting sleeve, which is threaded onto the valve cover and forms the upper limit of the upper spring seat. The main spring is located between the upper spring seat and the lower spring seat.

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