A safety valve leak-proof device

Abstract

A kind of safety valve leak-proof device belongs to pressure vessel protection technical field, the present application is to solve the problem of steam waste caused by spring safety valve occurs before leakage. Including shell and the second top rod of sliding arrangement on shell, the bellows body is communicated with the protected container by pressure tapping pipe, shell is fixed on safety valve, the medium pressure in protected container can change the size of bellows body axial expansion, in turn control in the medium pressure less than the setting pressure of spring safety valve, the second top rod is on top in safety valve stem, when the medium pressure reaches the setting pressure of spring safety valve, the second top rod is separated from safety valve stem, so that spring safety valve can smoothly take off. The present application can assist spring safety valve in reaching the zero leakage of setting pressure without adding any electrical components, the sealing effect is better, the possibility of safety valve steam leakage is solved, more steam waste is avoided, and the economic benefit of power plant operation is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pressure vessel protection, and particularly relates to a safety valve anti-leakage device. BACKGROUND

[0002] The spring safety valve for the conventional pressure vessel is a device for automatically discharging a certain amount of steam to protect the normal operation of the pressure vessel when the medium pressure exceeds the design value of the pressure vessel by means of the pressure of the high-temperature and high-pressure steam medium itself.

[0003] According to the regulations, the set pressure of the spring safety valve is 1.05-1.1 times the working pressure, but the unit pressure of the spring force on the sealing surface of the valve core is small, and generally at 90% of the set pressure, the safety valve will leak, which is called pre-leakage of the safety valve.

[0004] If the protected pressure vessel operates at 90% of the set pressure, the safety valve will continuously pre-leak, and long-term leakage will damage the sealing surface of the safety valve, leading to failure of the safety valve, in addition, the continuous leakage will also cause a large amount of steam to be wasted. SUMMARY

[0005] The purpose of the present application is to provide a safety valve anti-leakage device to solve the problem of steam waste caused by pre-leakage of the spring safety valve. The technical solution adopted by the present application is as follows:

[0006] A safety valve anti-leakage device, the safety valve is a spring safety valve, the lower opening of the spring safety valve is a medium inlet, and the upper end of the safety valve rod penetrates the spring safety valve upward:

[0007] The anti-leakage device comprises a shell, a partition plate is arranged in the middle of the shell, the partition plate divides the shell into a small chamber on the left and a main chamber on the right, a first sliding sleeve is arranged on the partition plate, a first jack rod is in sliding cooperation with the first sliding sleeve, the right end of the first jack rod penetrates into the main chamber and is connected with a jacking nut, a take-off spring assembly is sleeved with the left part of the first jack rod, the take-off spring assembly is arranged in the small chamber, the take-off spring assembly comprises a first spring, the two ends of the first spring are respectively in abutment with two first spring seats, the first spring seat on the left abuts with the shaft shoulder of the first jack rod, and the first spring seat on the right abuts with the first sliding sleeve, a small cover is connected to the left end of the small chamber, a corrugated pipe assembly comprises a corrugated pipe body, an air inlet nozzle and a jacking plate, the air inlet nozzle is sealingly connected with the left end of the corrugated pipe body, and the jacking plate is sealingly connected with the right end of the corrugated pipe body, the corrugated pipe body is arranged in the small cover, the jacking plate abuts with the first jack rod left and right, and the air inlet nozzle penetrates and is fixed on the small cover;

[0008] The upper spring cover is fixed on the upper side wall of the main chamber through the guide sleeve, the top end of the upper spring cover is provided with a second sliding sleeve, the upper part of the upper valve rod is in sliding fit with the second sliding sleeve, the lower part of the upper valve rod is in sliding fit with the guide sleeve, the upper spring assembly is sleeved on the upper valve rod, the upper spring assembly is in the upper spring cover, and the upper spring assembly comprises a second spring, the two ends of the second spring are respectively in corresponding abutment with two second spring seats, the second spring seat at the upper end is in abutment with the second sliding sleeve, and the second spring seat at the lower end is in abutment with the shaft shoulder of the upper valve rod, the lower end of the upper valve rod penetrates into the main chamber and is hinged to the upper end of the upper connecting rod;

[0009] The second top rod penetrates the lower side wall of the main chamber, the second top rod is in sliding fit with the lower side wall of the main chamber, the upper end of the second top rod is provided with a flange structure, the second top rod is sleeved with a reset spring, the two ends of the reset spring are respectively in abutment with the lower side wall of the main chamber and the flange structure, the upper end of the second top rod is hinged to the lower end of the lower connecting rod, the lower end of the upper connecting rod and the upper end of the lower connecting rod are hinged through a main pin shaft, the main pin shaft is sleeved with a roller, the upper valve rod and the second top rod are coaxially arranged, the air inlet is communicated with the protected container through a pressure taking pipe, the medium inlet of the spring safety valve is communicated with the protected container, and the shell is fixed on the spring safety valve through the support.

[0010] Further, the outer periphery of the first sliding sleeve is in threaded connection with the partition plate and is locked through a first locking nut.

[0011] Further, the outer periphery of the second sliding sleeve is in threaded connection with the upper spring cover and is locked through a second locking nut.

[0012] Further, the right end of the main chamber is provided with an inspection opening, an end cover is detachably arranged to close the inspection opening, and a limiting peg is arranged on the end cover, when the roller protrudes to the right and the upper connecting rod and the lower connecting rod are folded by approaching each other, the roller is in abutment with the limiting peg for limiting.

[0013] Compared with the prior art, the beneficial effects of the present application are that:

[0014] When the medium pressure in the protected container is less than the set pressure of the spring safety valve, the greater the medium pressure in the protected container, the greater the stroke and the pressure of the second top rod sliding downward, by arranging the present application on the top of the spring safety valve, without adding any electrical elements, the spring safety valve can be assisted to leak zero before reaching the set pressure, the sealing effect is better, the possibility of steam leakage of the safety valve is solved, more steam waste is avoided, and the economic benefit of power plant operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural schematic diagram of the present application;

[0016] Fig. 2 is an application connection schematic diagram of the present application;

[0017] Fig. 3 This is a schematic diagram of the bellows assembly.

[0018] In the diagram, 1. Bellows assembly, 2. Small cover, 3. First push rod, 4. Jumping spring assembly, 5. First sliding sleeve, 6. First locking nut, 7. Housing, 8. Top pressure nut, 9. Roller, 10. Guide sleeve, 11. Upper valve stem, 12. Upper spring assembly, 13. Upper spring cover, 14. Second sliding sleeve, 15. Second locking nut, 16. End cap, 17. Upper connecting rod, 18. Lower connecting rod, 19. Limit pin, 20. Second push rod, 21. Return spring, 22. Safety valve stem, 23. Spring safety valve, 24. Protected container, 25. Pressure tapping pipe, 26. Air inlet, 27. Bellows body, 28. Top pressure plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0020] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example: Figs. 1-3 As shown, a safety valve anti-leakage device is provided. The safety valve is a spring safety valve 23. The lower opening of the spring safety valve 23 is the medium inlet, and the side opening of the spring safety valve 23 is the medium outlet. The spring safety valve 23 is provided with a safety valve stem 22. The lower end of the safety valve stem 22 is connected to the valve disc. The valve disc opens and closes a valve seat located on the medium inlet. The upper end of the safety valve stem 22 passes upward through the valve cover of the spring safety valve 23, and the safety valve stem 22 slides and seals with the valve cover.

[0023] The leakage-proof device comprises a shell 7, a partition plate is arranged in the middle of the shell 7, the partition plate divides the shell 7 into a small chamber in the left part and a main chamber in the right part, a first sliding sleeve 5 is arranged on the partition plate, a first jacking rod 3 penetrates through the first sliding sleeve 5, the first jacking rod 3 is in sliding fit with the first sliding sleeve 5, the right end of the first jacking rod 3 penetrates into the main chamber and is connected with a jacking nut 8, a left part of the first jacking rod 3 is sleeved with a take-off spring assembly 4, the take-off spring assembly 4 is arranged in the small chamber, the take-off spring assembly 4 comprises a first spring, two ends of the first spring are respectively in abutment with two first spring seats, the first spring seat at the left end is in abutment with the shaft shoulder of the first jacking rod 3, and the first spring seat at the right end is in abutment with the first sliding sleeve 5, a small cover 2 is connected to the left end of the small chamber, a bellows assembly 1 comprises a bellows body 27, an air inlet nozzle 26 and a jacking plate 28, the air inlet nozzle 26 is in sealing connection with the left end of the bellows body 27, the jacking plate 28 is in sealing connection with the right end of the bellows body 27, the bellows body 27 is arranged in the small cover 2, the jacking plate 28 is in abutment with the first jacking rod 3, and the air inlet nozzle 26 penetrates through and is fixed on the small cover 2;

[0024] An upper spring cover 13 is fixed on the upper side wall of the main chamber through a guide sleeve 10, a top end of the upper spring cover 13 is provided with a second sliding sleeve 14, an upper part of an upper valve rod 11 is in sliding fit with the second sliding sleeve 14, a lower part of the upper valve rod 11 is in sliding fit with the guide sleeve 10, an upper spring assembly 12 is sleeved on the upper valve rod 11, the upper spring assembly 12 is arranged in the upper spring cover 13, the upper spring assembly 12 comprises a second spring, two ends of the second spring are respectively in abutment with two second spring seats, the second spring seat at the upper end is in abutment with the second sliding sleeve 14, and the second spring seat at the lower end is in abutment with the shaft shoulder of the upper valve rod 11, a lower end of the upper valve rod 11 penetrates into the main chamber and is hingedly connected with an upper end of an upper connecting rod 17;

[0025] A second jacking rod 20 penetrates through the lower side wall of the main chamber, the second jacking rod 20 is in sliding fit with the lower side wall of the main chamber, a flange structure is arranged at the upper end of the second jacking rod 20, a reset spring 21 is sleeved on the second jacking rod 20, two ends of the reset spring 21 are respectively in abutment with the lower side wall of the main chamber and the flange structure, the upper end of the second jacking rod 20 is hingedly connected with the lower end of a lower connecting rod 18, the lower end of the upper connecting rod 17 and the upper end of the lower connecting rod 18 are hingedly connected through a main pin shaft, a roller 9 is sleeved on the main pin shaft, the outer periphery of the roller 9 protrudes from the upper connecting rod 17 and the lower connecting rod 18, the upper valve rod 11 and the second jacking rod 20 are coaxially arranged, the air inlet nozzle 26 is in communication with a protected container 24 through a pressure taking pipe 25, a medium inlet of a spring safety valve 23 is in communication with the protected container 24, and the shell 7 is fixed on the spring safety valve 23 through a support.

[0026] When the pressure in the protected container 24 is normal pressure, the axis of the roller 9 is on the left side of the axis of the second jacking rod 20, the bellows body 27 is in the contracted state, the first jacking rod 3 slides to the left under the elastic force of the take-off spring assembly 4, the upper valve rod 11 slides downward under the elastic force of the upper spring assembly 12, the second jacking rod 20 slides upward under the elastic force of the reset spring 21, and the upper end of the upper connecting rod 17 and the lower end of the lower connecting rod 18 are folded together;

[0027] When the pressure in the protected container 24 is normal pressure, the axis of the roller 9 is on the left side of the axis of the second jacking rod 20, the bellows body 27 is in the contracted state, the first jacking rod 3 slides to the left under the elastic force of the take-off spring assembly 4, the upper valve rod 11 slides downward under the elastic force of the upper spring assembly 12, the second jacking rod 20 slides upward under the elastic force of the reset spring 21, and the upper end of the upper connecting rod 17 and the lower end of the lower connecting rod 18 are folded together;

[0028] When the pressure in the protected container 24 is normal pressure, the axis of the roller 9 is on the left side of the axis of the second jacking rod 20, the bellows body 27 is in the contracted state, the first jacking rod 3 slides to the left under the elastic force of the take-off spring assembly 4, the upper valve rod 11 slides downward under the elastic force of the upper spring assembly 12, the second jacking rod 20 slides upward under the elastic force of the reset spring 21, and the upper end of the upper connecting rod 17 and the lower end of the lower connecting rod 18 are folded together;

[0029] When the pressure in the protected container 24 is normal pressure, the axis of the roller 9 is on the left side of the axis of the second jacking rod 20, the bellows body 27 is in the contracted state, the first jacking rod 3 slides to the left under the elastic force of the take-off spring assembly 4, the upper valve rod 11 slides downward under the elastic force of the upper spring assembly 12, the second jacking rod 20 slides upward under the elastic force of the reset spring 21, and the upper end of the upper connecting rod 17 and the lower end of the lower connecting rod 18 are folded together;

[0030] The outer periphery of the first sliding sleeve 5 is threadedly connected with the partition plate, and is locked by the first locking nut 6. By adjusting the relative position of the first sliding sleeve 5 and the partition plate, the spring pre-tightening force of the take-off spring assembly 4 can be adjusted, and thus the medium pressure charged into the bellows body 27 when the second jacking rod 20 is separated from the safety valve rod 22 can be changed, and the setting pressure of the spring safety valve 23 can be adjusted to adapt to a wider range of setting pressure of the spring safety valve.

[0031] The outer periphery of the second sliding sleeve 14 is threadedly connected with the upper spring cover 13 and locked by a second locking nut 15. By adjusting the relative position of the second sliding sleeve 14 and the upper spring cover 13, the force applied by the second top rod 20 to the safety valve rod 22 can be adjusted.

[0032] The right end of the main chamber is provided with an access opening which is closed by a detachable end cover 16. The end cover 16 is provided with a limiting pin 19. When the roller 9 protrudes to the right and the upper connecting rod 17 and the lower connecting rod 18 are folded by approaching each other, the roller 9 is limited by the limiting pin 19. After the spring safety valve is launched, the roller 9 can be manually pushed back to the left of the second top rod axis through the end cover 16. The limiting pin 19 prevents the roller 9 from directly hitting the end cover 16 and prevents the damage of the end cover 16.

[0033] The above embodiments are only exemplary and do not limit the protection scope of the present application. Those skilled in the art can make changes to the parts of the present application without departing from the spirit and essence of the present application, and the changes are within the protection scope of the present application.

Claims

1. A safety valve anti-leakage device, wherein the safety valve is a spring safety valve (23), the lower opening of the spring safety valve (23) is a medium inlet, and the upper end of the safety valve stem (22) passes upward through the spring safety valve (23): Its features are: The leak-proof device includes a housing (7), with a partition in the middle of the housing (7) dividing the housing (7) into a small chamber on the left and a main chamber on the right. A first sliding sleeve (5) is provided on the partition, and a first push rod (3) slides within the first sliding sleeve (5). The right end of the first push rod (3) extends into the main chamber and is connected to a top-pressing nut (8). A spring assembly (4) is sleeved on the left side of the first push rod (3). The spring assembly (4) is located within the small chamber. The spring assembly (4) includes a first spring, with both ends of the first spring corresponding to and abutting against two first spring seats. The left end of the spring assembly... The first spring seat abuts against the shoulder of the first push rod (3), and the first spring seat at the right end abuts against the first sliding sleeve (5). The small cover (2) is connected to the left end of the small chamber. The bellows assembly (1) includes a bellows body (27), an air inlet (26), and a top pressure plate (28). The air inlet (26) is sealed to the left end of the bellows body (27), and the top pressure plate (28) is sealed to the right end of the bellows body (27). The bellows body (27) is set inside the small cover (2), and the top pressure plate (28) abuts against the first push rod (3) on the left and right. The air inlet (26) penetrates and is fixed on the small cover (2). The upper spring cover (13) is fixed on the upper side wall of the main chamber by the guide sleeve (10). The top of the upper spring cover (13) is provided with a second sliding sleeve (14). The upper part of the upper valve stem (11) is slidably engaged with the second sliding sleeve (14), and the lower part of the upper valve stem (11) is slidably engaged with the guide sleeve (10). The upper spring assembly (12) is sleeved on the upper valve stem (11). The upper spring assembly (12) is located inside the upper spring cover (13). The upper spring assembly (12) includes a second spring. The two ends of the second spring are respectively abutted against two second spring seats. The upper second spring seat abuts against the second sliding sleeve (14), and the lower second spring seat abuts against the shoulder of the upper valve stem (11). The lower end of the upper valve stem (11) extends into the main chamber and is hinged to the upper end of the upper connecting rod (17). The second push rod (20) penetrates the lower side wall of the main chamber. The second push rod (20) slides with the lower side wall of the main chamber. The upper end of the second push rod (20) is provided with a flange structure. A return spring (21) is sleeved on the second push rod (20). The two ends of the return spring (21) abut against the lower side wall of the main chamber and the flange structure, respectively. The upper end of the second push rod (20) is hinged to the lower end of the lower connecting rod (18). The lower end of the upper connecting rod (17) and the upper end of the lower connecting rod (18) are hinged through a main pin. A roller (9) is sleeved on the main pin. The upper valve stem (11) and the second push rod (20) are coaxially arranged. The air inlet (26) is connected to the protected container (24) through a pressure tapping pipe (25). The medium inlet of the spring safety valve (23) is connected to the protected container (24). The housing (7) is fixed on the spring safety valve (23) by a bracket.

2. The safety valve anti-leakage device according to claim 1, characterized in that: The outer periphery of the first sliding sleeve (5) is threadedly connected to the partition plate and locked by the first locking nut (6).

3. The safety valve anti-leakage device according to claim 1, characterized in that: The outer periphery of the second sliding sleeve (14) is threadedly connected to the upper spring cover (13) and locked by the second locking nut (15).

4. A safety valve leak-proof device according to any one of claims 1-3, characterized in that: The right end of the main chamber is provided with an inspection port. The end cover (16) can be detached to close the inspection port. The end cover (16) is provided with a limiting pin (19). When the roller (9) protrudes to the right and the upper connecting rod (17) and the lower connecting rod (18) are brought together and folded, the roller (9) and the limiting pin (19) abut against each other and are limited.

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