A chatter spring type safety valve

Abstract

The present application relates to a kind of to thwart flutter spring safety valve, belong to valve technical field, to solve the wear and tear and system instability problem caused by the quick movement of valve stem when fluttering of existing spring safety valve.The safety valve includes valve body, valve stem, valve cover, valve flap and main spring and other core components, wherein the top of valve cover is additionally provided with bonnet structure, and its inside is divided into upper cap cavity (storage buffer liquid) and lower cap cavity, and is communicated by the upper through hole on the partition plate.The scraper is installed on the top of valve stem, and when fluttering occurs, it moves quickly with valve stem, and cuts off the plastic plug rod in cutting cavity;The plastic plug rod is moved inward by the action of side push spring, so that the side groove is aligned with the upper through hole, and the liquid flows into the lower cap cavity, then enters the cover cavity through the middle through hole on the valve cover, and exerts viscous resistance on the lower spring seat, so as to slow down the movement of valve stem and eliminate fluttering.The present application activates liquid buffer by mechanical cutting, realizes automatic thwarting of fluttering, significantly reduces the risk of valve wear and tear, prolongs the service life, and ensures the safety and stability of system.

Description

TECHNICAL FIELD

[0001] The present application relates to the improvement of safety valve, in particular to an improved anti-chattering spring safety valve. BACKGROUND

[0002] Spring safety valve is a kind of valve that uses spring pre-tightening force to balance the medium force, automatically opens to release pressure when the system pressure exceeds the preset safety pressure, and automatically closes when the pressure drops to the preset reset pressure.

[0003] The main defect of the existing spring safety valve is the chattering phenomenon. When the spring safety valve is opened, the pipeline may vibrate sometimes, or the pipeline may vibrate due to other reasons. When the pipeline vibration is equal to the natural frequency of the spring, the valve disc and the recoil disc move back and forth, but the valve disc does not contact the valve seat. This causes the valve stem to move up and down rapidly, resulting in friction and wear, and even valve failure. Chattering not only accelerates the wear of valve parts, but also may cause instability of the pipeline system, threatening the safety of the equipment. The traditional safety valve uses pure mechanical spring design, lacks dynamic buffering mechanism, has no vibration blocking function, and only relies on valve seat contact damping. In the resonance state, it cannot effectively stop chattering. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide an anti-chattering spring safety valve.

[0005] In order to solve the above technical problems, the application is realized by the following technical scheme: the anti-vibration spring type safety valve comprises a valve body, a valve rod and a valve cover, the valve body is provided with an inlet cavity below the valve cavity and an outlet cavity on the side, the valve seat is arranged in the inlet cavity, the valve rod is movably arranged in the upper end of the valve body, the valve rod is provided with a backflush disc at the lower end, the backflush disc is provided with a valve flap, the valve flap is in sealing cooperation with the valve seat, the valve cover is arranged on the upper end of the valve body, the valve rod in the valve cover is provided with an upper spring seat, a lower spring seat and a main spring, the lower spring seat is movable with the valve rod, characterized in that: the valve cover is provided with a cover cavity, the lower end of the valve cover is provided with a lower end cover in sealing cooperation with the valve cover, the top of the valve cover is provided with a valve cap, the valve cap is provided with an upper cap cavity, a lower cap cavity and a partition plate, the upper cap cavity is stored with buffer liquid, the partition plate is provided with an upper through hole connecting the upper cap cavity and the lower cap cavity; the valve rod is sealingly arranged through the valve cover and extends into the lower cap cavity, the top of the valve rod is provided with a scraper, the scraper is movable with the valve rod when the vibration occurs, the partition plate corresponding to the scraper is provided with a cutting cavity and a limiting block, the limiting block is in limiting cooperation with the scraper, the cutting cavity is provided with a plastic plug rod, the plastic plug rod is in sealing cooperation with the upper through hole, the plastic plug rod is provided with a side push spring, the plastic plug rod is cut off by the scraper and moves inward under the action of the side push spring, the plastic plug rod is provided with a side groove, when the plastic plug rod moves inward to the set position, the side groove is connected with the upper through hole, the liquid in the upper cap cavity can flow into the lower cap cavity; the valve cover is provided with a middle through hole connecting the cover cavity and the lower cap cavity, when the liquid enters the cover cavity, the resistance is applied to the lower spring seat to slow down the movement of the valve rod and eliminate the vibration.

[0006] The outer end of the plastic plug rod is connected with an indicating rod, the indicating rod is movable and extends out of the valve cap and a side fixed plug, the indicating rod is used for monitoring the movement position of the plastic plug rod, when the indicating rod moves to be flush with the side fixed plug, it indicates that the side groove has been completely connected with the upper through hole, at this time, the plastic plug rod needs to be replaced.

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

[0008] The backflush disc is provided with a guide sleeve, the guide sleeve guides the upward and downward movement of the backflush disc, and the guide sleeve is fixed between the valve body and the valve cover.

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

[0010] The upper end of the scraper is provided with a receiving cavity located in the middle part, and the receiving cavity can receive the plastic plug rod which is cut off and falls.

[0011] The valve rod is provided with a step, the step forms the lower limit of the lower spring seat, the valve rod is provided with an adjusting sleeve, the adjusting sleeve is threadedly connected to the valve cover, and the adjusting sleeve forms the upper limit of the upper spring seat, and the main spring is limited 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. Figures 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 provided with a lower plug 32. Liquid can be discharged through the lower through hole 31, the system is quickly reset, and the maintenance time is shortened.

[0021] As a further improved embodiment, the backflushing disc 7 is provided with a guide sleeve 33, the guide sleeve 33 guides the up-down movement of the backflushing disc 7, the guide sleeve 33 is fixed between the valve body 1 and the valve cover 3, the stability of the movement of the backflushing disc 7 is improved, and the deflection is avoided.

[0022] As a further improved embodiment, the upper cap cavity 15 is provided with a liquid adding hole, and the liquid adding hole is provided with an upper plug 34, so that the buffer solution can be supplemented.

[0023] As a further improved embodiment, the upper end of the scraper 20 is provided with a receiving cavity 35 located in the middle, the receiving cavity 35 can receive the broken plastic plug rod 25 fragments, prevent the fragments from entering the buffer system, and guarantee the long-term operation reliability.

[0024] As a further improved embodiment, the valve rod 2 is provided with a step 36, the step 36 forms a lower limit of the lower spring seat 10, the valve rod 2 is provided with an adjusting sleeve 37, the adjusting sleeve 37 is threadedly connected to the valve cover 3, and the adjusting sleeve forms an upper limit 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 rod 2, and when the valve rod 2 moves upward against the elastic force, the lower spring seat 10 is driven to move upward.

[0025] The working principle of the present application is that when the pipeline vibration causes the valve rod 2 to move up and down quickly, the scraper 20 follows the movement and repeatedly cuts the plastic plug rod 25, the plastic plug rod 25 is moved inward under the action of the side push spring 26, that is, from the cutting cavity 23 to the receiving cavity; the plastic plug rod 25 moves inward until the side groove 27 is aligned 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 cover cavity 12 is filled with liquid, the lower spring seat 10 is soaked therein, the rapid movement of the valve rod 2 is inhibited by the viscous resistance of the liquid, the amplitude is reduced, and the flutter stops; after the flutter stops, the lower plug 32 can be screwed off through the hole to empty the liquid; during normal operation, the valve is opened, the valve rod 2 moves upward, the scraper 20 cuts the plastic plug rod 25 by a small segment, and the side groove 27 does not guide the upper through hole 19; after the valve is opened for many times, the plastic plug rod 25 is gradually consumed, and the length of the plastic plug rod 25 can be observed through the indicating rod 29; when the indicating rod 29 moves to be flush with the side fixed plug 30, it indicates that the side groove 27 has completely communicated with the upper through hole 19, and at this time, the plastic plug rod 25 needs to be replaced.

[0026] To sum up, the above is only the preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of thwarting vibration spring type safety valve, including valve body, valve stem, valve cover, the valve body is equipped with respectively the inlet cavity and the outlet cavity of the lower side of the valve cavity being led through, inlet cavity is equipped with valve seat, the valve stem can be moved up and down and is set on the upper end of valve body, the lower end of valve stem is equipped with backflush disc, backflush disc is equipped with valve flap, valve flap is sealed with valve seat, the valve cover is set on the upper end of valve body, the valve stem in the valve cover is equipped with upper spring seat, lower spring seat and main spring, lower spring seat can move up and down with the valve stem, it is characterized by: The valve cover is internally provided with a cover cavity, and a lower end cover is arranged at the lower end of the valve cover in sealing connection with the valve cover; a valve cap is arranged at the top of the valve cover, and the valve cap is internally provided with an upper cap cavity, a lower cap cavity and a partition plate separating the upper cap cavity from the lower cap cavity; a buffer liquid is stored in the upper cap cavity, and an upper through hole is arranged on the partition plate to communicate the upper cap cavity with the lower cap cavity; the valve rod is sealed through the valve cover and extends into the lower cap cavity, and a scraper is arranged at the top of the valve rod; the scraper can move up and down rapidly with the valve rod when the vibration occurs; a cutting cavity and a limiting block are arranged on the partition plate corresponding to the scraper; the limiting block is in limiting cooperation with the scraper; a plastic plug rod is arranged in the cutting cavity and is in sealing cooperation with the upper through hole on the side surface of the plastic plug rod; the plastic plug rod is arranged with a side pushing spring; the plastic plug rod can be cut off by the scraper and moves inward under the action of the side pushing spring; a side groove is arranged on the side surface of the plastic plug rod; when the plastic plug rod moves inward to a set position, the side groove communicates the upper through hole, and the liquid in the upper cap cavity can flow into the lower cap cavity; a middle through hole is arranged on the valve cover to communicate the cover cavity with the lower cap cavity; when the liquid enters the cover cavity, a resistance is applied to the lower spring seat to slow down the movement of the valve rod and eliminate the vibration.

2. The nuisance trip spring loaded safety valve of claim 1 wherein: An indicating rod is connected to the outer end of the plastic plug rod, and the indicating rod can move out of the valve cap and a side fixed plug; the indicating rod is used to monitor the moving position of the plastic plug rod; when the indicating rod moves to be flush with the side fixed plug, it indicates that the side groove has completely communicated with the upper through hole, and the plastic plug rod needs to be replaced at this time.

3. The nuisance trip spring loaded safety valve of claim 1 wherein: The valve cover is provided with a lower through hole, and a lower plug is arranged at the lower through hole; the liquid can be discharged through the lower through hole.

4. The nuisance trip spring loaded safety valve of claim 1 wherein: The backflushing disc is arranged with a guide sleeve, the guide sleeve guides the upward and downward movement of the backflushing disc, and the guide sleeve is fixed between the valve body and the valve cover.

5. The nuisance trip spring loaded safety valve of claim 1 wherein: An adding hole is arranged on the upper cap cavity, and an upper plug is arranged at the adding hole.

6. The nuisance trip spring loaded safety valve of claim 1 wherein: A receiving cavity is arranged at the middle of the upper end of the scraper, and the receiving cavity can receive the plastic plug rod that is cut off and falls.

7. The nuisance trip spring loaded safety valve of claim 1 wherein: A step is arranged on the valve rod, the step forms the lower limit of the lower spring seat; an adjusting screw sleeve is arranged on the valve rod, the adjusting screw sleeve is threadedly connected to the valve cover, and the adjusting screw sleeve forms the upper limit of the upper spring seat; and the main spring is limited between the upper spring seat and the lower spring seat.

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