A bellows back pressure balanced full lift safety valve
By designing a bellows back pressure balance mechanism in the safety valve, ensuring that the pressure above the valve core remains balanced, the problem of poor response timeliness of existing safety valves in high-pressure environments is solved, and the sealing effect is improved.
Patent Information
- Application Number
- CN202520354363.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2035-03-03
AI Technical Summary
In the high-pressure, high-temperature and high-risk environments, the back pressure above the valve core cannot be balanced, which affects the timeliness of the valve core response.
A corrugated back pressure balanced fully open safety valve is designed. By setting the valve body and inner chamber, the upper slip ring and the piston pillar are all slidally connected to the inner chamber, and ensuring that the sum of the thicknesses of the upper slip ring and the piston pillar is greater than the inner diameter of the liquid outlet end, preventing the medium from entering above the piston pillar and maintaining pressure balance.
It effectively reduces the impact of back pressure, makes the valve core response more timely, and improves the sealing effect through sealing rings and sealing sleeves to avoid leakage.
Smart Images
Figure CN222717545U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of safety valves, in particular to a bellows back pressure balanced full-lift safety valve. Background Art
[0002] A safety valve is a valve with automatic pressure relief protection. It uses the pressure of the medium itself to promote the opening of the valve core to discharge the medium. When the pressure decreases, the valve core can automatically recover and achieve a blocking effect.
[0003] In industrial production, especially in high pressure, high temperature and high risk environments, the safety protection device (safety valve) of pressure vessels is very important. There are many types of safety valves on the market, but most of them have a large internal space, and the valve core can only block the liquid inlet. When the valve core is opened, part of the medium will flow out with the liquid outlet pipe, but some of the medium will enter the top of the valve core. This part of the high-pressure medium will squeeze the valve core downward, causing the back pressure part above the valve core to be unable to maintain a good balance, affecting the timeliness of the valve core response. In view of this, we proposed a bellows back pressure balanced full-lift safety valve. Summary of the invention
[0004] The utility model aims to provide a bellows back pressure balanced full lift safety valve to solve the defects mentioned in the above background technology.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A bellows back-pressure balanced full-lift safety valve comprises a valve body, an inner chamber is arranged inside the valve body, a liquid inlet end is arranged at the bottom of the valve body, a liquid outlet end is arranged at the side of the valve body, a valve cover is arranged on the top of the valve body, a valve stem is slidably connected to the valve cover, a bottom fixing ring is fixedly installed at the bottom wall of the inner chamber, a first sealing ring is arranged on the upper surface of the bottom fixing ring, a piston column is fixedly installed on the valve stem, the piston column is located in the inner chamber and is slidably connected to the inner chamber, an upper sliding ring is fixedly installed on the top and bottom surfaces of the piston column, a second sealing ring is arranged on the annular side of the upper sliding ring, a spring is arranged between the valve cover and the upper sliding ring located above, and the spring surrounds the valve stem.
[0007] Preferably, a liquid inlet chamber is provided in the liquid inlet end, and the liquid inlet chamber is communicated with the inner chamber.
[0008] Preferably, the piston column is located directly above the liquid inlet chamber, and the sum of the thickness of the piston column and the two upper sliding rings is greater than the inner diameter of the liquid outlet end.
[0009] Preferably, a collar is fixedly mounted on the upper surface of the bottom fixing ring, through holes are provided at the center positions of the collar and the bottom fixing ring, and the first sealing ring is sleeved on the collar.
[0010] Preferably, an annular groove is provided on the annular side surface of the upper sliding ring, and the second sealing ring is sleeved on the annular groove.
[0011] Preferably, a fixing plate is fixedly mounted on the bottom surface of the upper sliding ring located at the bottom, and a sealing sleeve is provided on the fixing plate.
[0012] Preferably, a chuck is fixedly mounted on the bottom surface of the fixed plate, a clamping chamber whose top is connected to the outside is provided in the sealing sleeve, and the chuck is located in the clamping chamber and is clamped with the clamping chamber.
[0013] Preferably, the height of the inner chamber is greater than twice the sum of the thicknesses of the piston column and the two upper sliding rings.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The utility model provides a valve body and an inner chamber, and the upper sliding ring and the piston column are both slidably connected to the inner chamber, and the sum of the thickness of the upper sliding ring and the piston column is greater than the inner diameter of the liquid outlet end, so that the upper sliding ring and the piston column can block the medium from entering the upper part of the piston column during the process of moving up and down, which is beneficial to keep the pressure above the piston column balanced, reduce the influence of back pressure, and achieve the effect of making the valve core respond more promptly.
[0016] 2. The utility model can improve the sealing effect by providing the first sealing ring, the second sealing ring and the sealing sleeve, making it difficult for leakage to occur. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] Figure 2 This is one of the partial structural schematic diagrams of the utility model.
[0019] Figure 3 This is the second partial structural schematic diagram of the utility model.
[0020] Figure 4 This is the third partial structural schematic diagram of the utility model.
[0021] Figure 5 This is the fourth partial structural schematic diagram of the utility model.
[0022] The meaning of each number in the figure is:
[0023] 1. Valve body; 10. Liquid inlet end; 11. Liquid outlet end; 12. Liquid inlet chamber; 13. Inner chamber; 14. Valve cover; 15. Valve stem;
[0024] 2. Bottom fixing ring; 20. Ring; 21. Through hole; 22. First sealing ring;
[0025] 3. Piston column; 30. Upper sliding ring; 301. Annular groove; 31. Second sealing ring; 32. Fixed plate; 33. Chuck; 34. Sealing sleeve; 341. Snap-on chamber;
[0026] 4. Spring. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] See also Figure 1-Figure 5 The utility model provides a technical solution: a bellows back pressure balanced full-lift safety valve, comprising a valve body 1, an inner chamber 13 is arranged inside the valve body 1, a liquid inlet end 10 is arranged at the bottom of the valve body 1, a liquid outlet end 11 is arranged at the side of the valve body 1, and the liquid outlet end 11 is located near the liquid inlet end 10, a valve cover 14 is arranged on the top of the valve body 1, a valve stem 15 is slidably connected to the valve cover 14, a bottom fixing ring 2 is fixedly installed at the bottom wall of the inner chamber 13, a first sealing ring 22 is arranged on the upper surface of the bottom fixing ring 2, and a valve stem 15 is fixedly installed on the valve stem 15. The piston column 3 is located in the inner chamber 13 and is slidably connected with the inner chamber 13. An upper sliding ring 30 is fixedly installed on the top and bottom surfaces of the piston column 3. A second sealing ring 31 is provided on the annular side of the upper sliding ring 30. A spring 4 is provided between the valve cover 14 and the upper sliding ring 30 located above. The spring 4 surrounds the valve stem 15 to ensure that when in use, the spring 4 is in a normal state, and the upper sliding ring 30 below is just against the bottom fixing ring 2. At this time, the upper sliding ring 30 and the piston column 3 just block the liquid outlet end of the liquid inlet end 10 and the liquid inlet end of the liquid outlet end 11.
[0029] In this embodiment, a liquid inlet chamber 12 is disposed in the liquid inlet end 10 , and the liquid inlet chamber 12 is communicated with the inner chamber 13 for normal flow operation of the medium.
[0030] Specifically, the piston column 3 is located directly above the liquid inlet chamber 12, and the sum of the thicknesses of the piston column 3 and the two upper sliding rings 30 is greater than the inner diameter of the liquid outlet end 11, so that when the upper sliding rings 30 and the piston column 3 are at the bottom, the liquid inlet end 10 and the liquid outlet end 11 can be sealed at the same time.
[0031] Furthermore, a collar 20 is fixedly mounted on the upper surface of the bottom fixing ring 2 , and through holes 21 are provided at the center positions of the collar 20 and the bottom fixing ring 2 . The first sealing ring 22 is sleeved on the collar 20 to realize the assembly operation of the first sealing ring 22 .
[0032] In addition, an annular groove 301 is provided on the annular side surface of the upper sliding ring 30 , and the second sealing ring 31 is sleeved on the annular groove 301 to achieve normal assembly operation of the second sealing ring 31 .
[0033] It is worth mentioning that a fixed disk 32 is fixedly installed on the bottom surface of the upper slip ring 30 located at the bottom, and a sealing sleeve 34 is arranged on the fixed disk 32; a chuck 33 is fixedly installed on the bottom surface of the fixed disk 32, and a clamping chamber 341 whose top is connected to the outside is arranged in the sealing sleeve 34, and the chuck 33 is located in the clamping chamber 341 and is clamped and matched with the clamping chamber 341 to realize the assembly operation of the sealing sleeve 34.
[0034] It is worth noting that the height of the inner chamber 13 is greater than twice the sum of the thicknesses of the piston column 3 and the two upper sliding rings 30, so that when the piston column 3 and the upper sliding rings 30 move upward to above the liquid outlet end 11, the full start operation is completed.
[0035] When the bellows back pressure balanced full-lift safety valve of the utility model is used, the liquid inlet end 10 and the liquid outlet end 11 are respectively connected to the corresponding medium pipelines in the outside world. As the pressure in the medium pipeline increases, the medium in the medium pipeline will push the upper sliding ring 30 and the piston column 3 upward. At this time, the medium can flow out along the liquid outlet end 11 to achieve pressure relief protection, and at this time the spring 4 is compressed;
[0036] When the pressure in the medium pipeline decreases, the spring 4 returns to its original state, and can drive the upper sliding ring 30 and the piston column 3 to move downward. The upper sliding ring 30 and the piston column 3 just block the liquid outlet end of the liquid inlet end 10 and the liquid inlet end of the liquid outlet end 11.
[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A bellows back pressure balanced full lift safety valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with an inner chamber (13) inside, a liquid inlet end (10) is provided at the bottom of the valve body (1), a liquid outlet end (11) is provided at the side of the valve body (1), a valve cover (14) is provided at the top of the valve body (1), a valve stem (15) is slidably connected to the valve cover (14), a bottom fixing ring (2) is fixedly installed at the bottom wall of the inner chamber (13), a first sealing ring (22) is provided on the upper surface of the bottom fixing ring (2), and the valve cover (14) is provided with a valve stem (15). A piston column (3) is fixedly mounted on the valve stem (15), the piston column (3) is located in the inner chamber (13) and is slidably connected to the inner chamber (13), an upper sliding ring (30) is fixedly mounted on the top and bottom surfaces of the piston column (3), a second sealing ring (31) is arranged on the annular side surface of the upper sliding ring (30), a spring (4) is arranged between the valve cover (14) and the upper sliding ring (30) located above, and the spring (4) surrounds the valve stem (15).
2. The bellows back pressure balanced full lift safety valve according to claim 1 is characterized in that: A liquid inlet chamber (12) is provided in the liquid inlet end (10), and the liquid inlet chamber (12) is communicated with the inner chamber (13).
3. The bellows back pressure balanced full lift safety valve according to claim 2 is characterized in that: The piston column (3) is located directly above the liquid inlet chamber (12), and the sum of the thicknesses of the piston column (3) and the two upper sliding rings (30) is greater than the inner diameter of the liquid outlet end (11).
4. The bellows back pressure balanced full lift safety valve according to claim 1 is characterized in that: A collar (20) is fixedly mounted on the upper surface of the bottom fixing ring (2), through holes (21) are provided at the center positions of the collar (20) and the bottom fixing ring (2), and the first sealing ring (22) is sleeved on the collar (20).
5. The bellows back pressure balanced full lift safety valve according to claim 1 is characterized in that: An annular groove (301) is provided on the annular side surface of the upper sliding ring (30), and the second sealing ring (31) is sleeved on the annular groove (301).
6. The bellows back pressure balanced full lift safety valve according to claim 5 is characterized in that: A fixing plate (32) is fixedly mounted on the bottom surface of the upper sliding ring (30) located at the bottom, and a sealing sleeve (34) is provided on the fixing plate (32).
7. The bellows back pressure balanced full lift safety valve according to claim 6 is characterized in that: A chuck (33) is fixedly mounted on the bottom surface of the fixed disk (32); a clamping chamber (341) whose top is connected to the outside is provided in the sealing sleeve (34); the chuck (33) is located in the clamping chamber (341) and is clamped and matched with the clamping chamber (341).
8. The bellows back pressure balanced full lift safety valve according to claim 1 is characterized in that: The height of the inner chamber (13) is greater than twice the sum of the thicknesses of the piston column (3) and the two upper sliding rings (30).