Balanced sealing ring structure of high-pressure bypass valve

Abstract

The invention relates to the technical field of balance sealing rings, and particularly discloses a high-pressure bypass valve balance sealing ring structure which comprises a valve body, a valve cage arranged in the valve body, a valve element movably connected to the inner side of the valve cage and a main sealing ring arranged on the outer side of the valve cage. The automatic compensation component comprises an annular cavity arranged in the periphery of the main sealing ring. According to the balance sealing ring structure of the high-pressure bypass valve, continuous pressure can be evenly applied to the periphery of the main sealing ring through the arranged automatic compensation component, so that the periphery of the main sealing ring has the trend of outward deformation and expansion, the pressure between the main sealing ring and the inner wall of a valve cage can be increased, and therefore the sealing performance is improved; meanwhile, automatic compensation can be achieved according to outer edge abrasion of the main sealing ring.

Description

Technical Field

[0001] The invention relates to the technical field of balanced sealing rings, and in particular to a balanced sealing ring structure of a high-pressure bypass valve. Background Art

[0002] The balancing seal ring in the bypass valve is a key component in the valve system. Its performance directly affects the sealing effect, service life and stability of fluid control of the valve. At present, the movement of the valve core inside the valve cage depends on the effective sealing of the balancing seal ring. The balancing seal ring not only ensures the balance of force on the valve core when the valve is open, but also optimizes the operating performance of the valve by balancing the fluid pressure on both sides.

[0003] At present, when the valve is opened, since the fluid itself needs to flow through the valve core and the other side of the balancing sealing ring, the requirements for the sealing of the balancing sealing ring are relatively loose. Even if there is a slight leakage in the sealing ring, it will not significantly interfere with the normal flow and regulation of the fluid. However, when the valve is in a fully closed state, the requirements for sealing are extremely strict, and no leakage must be guaranteed to maintain the integrity and efficiency of the system. However, the contact pressure between the balancing sealing ring and the inner wall of the valve cage in the prior art remains almost unchanged under different working states of the valve (open or closed), which results in the sealing ring suffering similar friction loss regardless of whether the valve is open or closed. This continuous and indiscriminate wear not only shortens the service life of the sealing ring, but also increases maintenance costs. In addition, the automatic compensation ability of the existing balancing sealing ring is poor. As the use time increases, the edge of the sealing ring is prone to slightly reduce the diameter due to wear, which will directly weaken its sealing performance and may even cause leakage problems.

[0004] Therefore, it is necessary to propose a balanced sealing ring structure of a high-pressure bypass valve to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a balanced sealing ring structure of a high-pressure bypass valve, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A balanced sealing ring structure of a high-pressure bypass valve comprises a valve body, a valve cage arranged inside the valve body, a valve core movably connected to the inner side of the valve cage, and a main sealing ring arranged outside the valve cage, wherein the main sealing ring is provided with an automatic compensation component, and the automatic compensation component comprises an annular cavity arranged inside the outer periphery of the main sealing ring, an installation chamber corresponding to the annular cavity is evenly arranged on the inner side of the inner periphery of the main sealing ring, a piston hole is arranged at one end of the installation chamber close to the annular cavity, and the annular cavity and the installation chamber are connected through the piston hole, a piston is slidably connected to the inner side of the piston hole, a second push block for applying pressure to the piston is arranged on the side of the piston away from the annular cavity, and an elastic member for continuously applying pressure to the second push block is arranged on the side of the second push block away from the piston;

[0008] It also includes a pressure regulating component including a second through hole arranged on a second push block, an inner wall of the valve body or the valve cage is provided with an adjusting rod corresponding to the second push block, and one end of the adjusting rod passes through the second through hole and extends to the inner side of the valve core, and the adjusting rod is movably connected to the second through hole and the valve core, a notch is provided on one side of the adjusting rod, and one end of the notch is provided with a slope surface that smoothly transitions to the side wall of the adjusting rod, when the valve core is in a closed state with respect to the valve cage, the second through hole corresponds to the notch portion, and when the valve core gradually opens, the second through hole corresponds to the portion other than the notch on the adjusting rod, and it is configured that when the second through hole corresponds to the notch, the second push block applies pressure to the piston, and when the second through hole corresponds to the portion other than the notch on the adjusting rod, the second push block stops applying pressure to the piston.

[0009] Preferably, a plug rod is provided on the side of the piston close to the second push block, and a third push block movably connected to the installation chamber is provided on the end of the plug rod close to the second push block, the second push block is movably connected to the inside of the installation chamber, and the second push block is used to apply pressure to the third push block, so that the third push block applies pressure to the piston through the plug rod.

[0010] Preferably, the main sealing ring is fixed to one end of the valve core by a crimping assembly, the crimping assembly comprises a crimping ring locked to one end of the valve core by bolts, and the inner periphery of the main sealing ring is pressed to one end of the valve core by the crimping ring;

[0011] Sealing insert rings protruding from the side walls of the main sealing ring are symmetrically arranged on both sides of the inner periphery of the main sealing ring. Sealing grooves corresponding to and matching the sealing insert rings are arranged on the opposite sides of the crimping ring and the valve core. The sealing insert rings on both sides of the main sealing ring are respectively plugged into and matched with the sealing grooves on the crimping ring and the valve core.

[0012] Preferably, the main sealing ring and the crimping ring are provided with a first through hole corresponding to the second through hole, one end of the valve core is provided with a accommodating hole corresponding to the first through hole, and the accommodating hole is a blind hole, one end of the adjusting rod passes through the first through hole and the second through hole and extends to the accommodating hole, and the adjusting rod is movably connected to the first through hole and the accommodating hole.

[0013] Preferably, annular grooves adapted to the sealing insert ring and connected to the installation chamber are symmetrically arranged on both sides of the inner periphery of the main sealing ring, and one end of the sealing insert ring is movably connected to the inner side of the annular groove;

[0014] The main sealing ring is provided with a pressure-applying assembly for applying continuous pressure to the sealing insert ring, the pressure-applying assembly includes a first push block which is arranged at one end of the elastic member away from the second push block and is movably connected to the installation chamber, a first connecting seat is provided on the side wall of one end of the sealing insert ring close to the installation chamber, second connecting seats corresponding to the first connecting seat are provided at both ends of the first push block, a traction rod is provided between the second connecting seat and the corresponding first connecting seat, and both ends of the traction rod are movably connected to the first connecting seat and the second connecting seat respectively through pin shafts.

[0015] Preferably, the elastic member is a spring.

[0016] Preferably, a guide member is provided at one end of the inner side of the installation chamber close to the first push block, the guide member comprises a guide rod fixed to one end of the inner side of the installation chamber close to the first push block, a second guide hole adapted to the guide rod is provided at the middle part of the first push block, a first guide hole adapted to the guide rod is provided at one side of the second push block close to the guide rod, the first guide hole is a blind hole, the first push block is movably sleeved on the outside of the guide rod through the second guide hole, and the second push block is movably connected to the outside of the guide rod through the first guide hole;

[0017] The elastic member is arranged outside the guide rod.

[0018] Preferably, the periphery of the main sealing ring protrudes from the side wall of the valve core, and auxiliary sealing rings are symmetrically arranged on both sides of the protruding part of the main sealing ring, and the auxiliary sealing rings are woven by nickel wire and graphite fiber.

[0019] Preferably, the nickel wire and graphite fiber are woven in a plain weave.

[0020] Preferably, a flow-guiding protrusion protruding from the secondary sealing ring and in an annular shape is provided on the secondary sealing ring near one end of the inlet of the valve body, and a side of the flow-guiding protrusion away from the secondary sealing ring is an arc-shaped surface;

[0021] A pressure-bearing depression that is recessed inward is arranged on the secondary sealing ring at one end away from the inlet of the valve body, and the pressure-bearing depression is an arc-shaped depression.

[0022] Compared with the prior art, the present invention provides a balanced sealing ring structure of a high-pressure bypass valve, which has the following beneficial effects:

[0023] 1. The balanced sealing ring structure of the high-pressure bypass valve can evenly apply continuous pressure to the periphery of the main sealing ring through the automatic compensation component, so that the periphery of the main sealing ring has a tendency to deform and expand outward, which can increase the pressure on the inner wall of the valve cage, thereby improving the sealing performance, and can automatically compensate according to the wear of the outer edge of the main sealing ring; the setting of the pressure regulating component can temporarily cancel the continuous pressure acting on the periphery of the main sealing ring when the valve core is gradually opened, which can reduce the pressure between the main sealing ring and the inner wall of the valve cage when opening, thereby reducing wear and increasing the service life of the main sealing ring, and continue to apply pressure to the periphery of the main sealing ring when the valve core is closed to ensure sealing performance, compact structure, and easy use.

[0024] 2. The balanced sealing ring structure of the high-pressure bypass valve, the setting of the sealing insert and the sealing groove can increase the sealing performance of the crimping connection between the main sealing ring and the valve core. The pressure-applying component can make the sealing insert and the sealing groove continuously and tightly fit, further improving the sealing performance. In addition, the elastic part is shared with the automatic compensation component, and two effects are achieved through the reverse forces at both ends of the elastic part, thereby increasing practicality.

[0025] 3. The balanced sealing ring structure of the high-pressure bypass valve can improve the overall strength and erosion resistance of the sealing ring by providing auxiliary sealing rings woven from nickel wire and graphite fiber on both sides of the main sealing ring, reduce the probability of internal leakage of the high-pressure bypass valve, and improve the operating reliability and economy of the unit. The pressure-bearing depressions and guide protrusions provided on both sides are conducive to reducing the pressure difference on both sides of the main sealing ring when the valve core is in the open state, which is beneficial to the balance and stability of the valve core and is also conducive to adjusting the position of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the valve core, valve cage and main sealing ring of the present invention in a disassembled state;

[0028] Figure 3 It is a structural schematic diagram of the valve core, the crimping ring and the main sealing ring of the present invention in a disassembled state;

[0029] Figure 4 It is a schematic structural diagram of one end of the valve core of the present invention close to the main sealing ring;

[0030] Figure 5 It is a schematic diagram of the overall structure of the main sealing ring and the auxiliary sealing ring of the present invention;

[0031] Figure 6 The present invention Figure 5 A structural diagram from another perspective based on the above;

[0032] Figure 7It is a schematic diagram of the structure of the auxiliary sealing ring and the main sealing ring of the present invention in a disassembled state;

[0033] Figure 8 It is a schematic diagram of the cross-sectional structure of the main sealing ring of the present invention;

[0034] Fig. 9 The present invention Figure 8 Enlarged view of point A in the middle;

[0035] Fig.10 It is a structural schematic diagram of the sealing insert ring, the automatic compensation component and the main sealing ring of the present invention in a disassembled state;

[0036] Fig.11 It is a schematic diagram of the exploded structure of the automatic compensation component of the present invention;

[0037] Fig.12 It is a schematic structural diagram of the present invention when the adjusting rod and the second through hole are in a matching state.

[0038] In the figure: 1, valve body; 2, valve core; 3, valve cage; 4, main sealing ring; 5, fixing block; 6, adjusting rod; 7, crimping ring; 8, sealing groove; 9, secondary sealing ring; 10, sealing insert ring; 11, pressure-bearing depression; 12, accommodating hole; 13, guide protrusion; 14, annular cavity; 15, installation chamber; 16, piston hole; 17, annular groove; 18, traction rod; 19, piston; 20, third push block; 21, second push block; 22, first push block; 23, first through hole; 24, guide rod; 25, first connecting seat; 26, elastic member; 27, plug rod; 28, first guide hole; 29, sealing ring; 30, second through hole; 31, second connecting seat; 32, notch; 33, slope; 34, second guide hole. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] like Figure 1-Figure 6As shown, a balanced sealing ring structure of a high-pressure bypass valve comprises a valve body 1, a valve cage 3 arranged inside the valve body 1, a valve core 2 movably connected to the inner side of the valve cage 3, and a main sealing ring 4 arranged outside the valve cage 3, the main sealing ring 4 is fixed to one end of the valve core 2 by a crimping assembly, the crimping assembly comprises a crimping ring 7 locked to one end of the valve core 2 by bolts, the inner periphery of the main sealing ring 4 is pressed against one end of the valve core 2 by the crimping ring 7, the outer periphery of the main sealing ring 4 protrudes from the side wall of the valve core 2, in order to increase the sealing performance of the connection between the main sealing ring 4 and the valve core 2, sealing insert rings 10 protruding from the side wall of the main sealing ring 4 are symmetrically arranged on both sides of the inner periphery of the main sealing ring 4, and sealing grooves 8 corresponding to and matching the sealing insert rings 10 are arranged on the opposite side of the crimping ring 7 and the valve core 2, and the sealing insert rings 10 located on both sides of the main sealing ring 4 are respectively plugged and matched with the crimping ring 7 and the sealing grooves 8 on the valve core 2;

[0041] like Figure 8-Figure 11 As shown, the main sealing ring 4 is provided with an automatic compensation component, which includes an annular cavity 14 arranged inside the outer periphery of the main sealing ring 4, and an installation chamber 15 corresponding to the annular cavity 14 is evenly arranged on the inner side of the inner periphery of the main sealing ring 4. The installation chamber 15 is provided with a piston hole 16 at one end of the installation chamber 15 close to the annular cavity 14, and the annular cavity 14 and the installation chamber 15 are connected through the piston hole 16. The inner side of the piston hole 16 is slidably connected with a piston 19. In order to increase the sealing performance, a sealing ring 29 is provided on the outer side of the piston 19, and a plug rod 27 is provided on the side of the piston 19 away from the annular cavity 14, and a plug rod 27 is provided at the end of the plug rod 27 away from the piston 19. A third push block 20 movably connected to the installation chamber 15 is provided on a side of the third push block 20 away from the plug rod 27 with a second push block 21 movably connected to the installation chamber 15 and used to apply pressure to the third push block 20. An elastic member 26 for continuously applying pressure to the second push block 21 is provided on a side of the second push block 21 away from the piston 19. The elastic member 26 is preferably a spring. The automatic compensation component can uniformly apply continuous pressure to the periphery of the main sealing ring 4, so that the periphery of the main sealing ring 4 has a tendency to deform and expand outward, which can increase the pressure on the inner wall of the valve cage 3, thereby increasing the sealing performance, and can automatically compensate according to the wear of the outer edge of the main sealing ring 4;

[0042] Further, such as Figure 1-Figure 2 , Figure 4 , Fig. 9 , Figure 11-Figure 12As shown, the pressure regulating assembly also includes a second through hole 30 arranged on the second push block 21, and the inner wall of the valve body 1 or the valve cage 3 is provided with an adjusting rod 6 corresponding to the second push block 21. Specifically, the inner wall of the valve body 1 or the valve cage 3 is provided with a fixing block 5 protruding from the inner wall of the valve body 1 or the inner wall of the valve cage 3, one end of the adjusting rod 6 is fixed on the fixing block 5, and one end of the adjusting rod 6 extends to the inner side of the valve core 2 through the second through hole 30, and the adjusting rod 6 is movably connected to the second through hole 30 and the valve core 2. Specifically, the main sealing ring 4 and the crimping ring 7 are provided with a first through hole 23 corresponding to the second through hole 30, and one end of the valve core 2 is provided with a receiving hole 12 corresponding to the first through hole 23, and the receiving hole 12 is a blind hole, one end of the adjusting rod 6 passes through the first through hole 23 and the second through hole 30 to extend to the receiving hole 12, and the adjusting rod 6 is movably connected to the first through hole 23 and the receiving hole 12. A notch 32 is provided on one side of 6, and a slope 33 which smoothly transitions with the side wall of the regulating rod 6 is provided at one end of the notch 32. When the valve core 2 is in a closed state with respect to the valve cage 3, the second through hole 30 corresponds to part of the notch 32. When the valve core 2 is gradually opened, the second through hole 30 corresponds to the portion other than the notch 32 on the regulating rod 6. The valve core 2 is configured such that when the second through hole 30 corresponds to the notch 32, the second push block 21 applies pressure to the piston 19, and when the second through hole 30 corresponds to the portion other than the notch 32 on the regulating rod 6, the second push block 21 cancels applying pressure to the piston 19. The setting of the pressure regulating assembly can temporarily cancel the continuous pressure acting on the periphery of the main sealing ring 4 when the valve core 2 is gradually opened, thereby reducing the pressure between the main sealing ring 4 and the inner wall of the valve cage 3 when opening, thereby reducing wear and improving the service life of the main sealing ring 4. When the valve core 2 is closed, pressure is continuously applied to the periphery of the main sealing ring 4 to ensure sealing.

[0043] like Figure 9-11As shown, in order to make the sealing insert ring 10 exert continuous pressure on the inside of the sealing groove 8, annular grooves 17 adapted to the sealing insert ring 10 and connected to the installation chamber 15 are symmetrically arranged on both sides of the inner periphery of the main sealing ring 4, and one end of the sealing insert ring 10 is movably connected to the inner side of the annular groove 17. A pressure-applying component for applying continuous pressure to the sealing insert ring 10 is arranged on the main sealing ring 4. The pressure-applying component includes a first push block 22 which is arranged at an end of the elastic member 26 away from the second push block 21 and movably connected to the installation chamber 15. A first connecting seat 25 is arranged on the side wall of one end of the sealing insert ring 10 close to the installation chamber 15. Second connecting seats 31 corresponding to the first connecting seat 25 are arranged at both ends of the first push block 22. A traction rod 18 is arranged between the second connecting seat 31 and the corresponding first connecting seat 25, and the two ends of the traction rod 18 are respectively connected to the first connecting seat 25 and the second connecting seat 31 through a pin. The shaft is movably connected and shares the elastic member 26 with the automatic compensation component. Two effects are achieved through the reverse forces at both ends of the elastic member 26, which increases practicality. In order to increase the stability of the first push block 22 and the second push block 21, a guide member is provided at one end of the inner side of the installation chamber 15 close to the first push block 22. The guide member includes a guide rod 24 fixed to the inner side of the installation chamber 15 close to one end of the first push block 22. A second guide hole 34 adapted to the guide rod 24 is provided in the middle of the first push block 22. A first guide hole 28 adapted to the guide rod 24 is provided on one side of the second push block 21 close to the guide rod 24. The first guide hole 28 is a blind hole. The first push block 22 is movably sleeved on the outside of the guide rod 24 through the second guide hole 34. The second push block 21 is movably connected to the outside of the guide rod 24 through the first guide hole 28. In order to increase the stability of the elastic member 26, the elastic member 26 is provided on the outside of the guide rod 24.

[0044] like Figure 3 , Figure 5-Figure 7 As shown, the periphery of the main sealing ring 4 protrudes from the side wall of the valve core 2, and auxiliary sealing rings 9 are symmetrically arranged on both sides of the protruding part of the main sealing ring 4. The auxiliary sealing rings 9 are woven by nickel wires and graphite fibers. The weaving method of the nickel wires and the graphite fibers is preferably plain weaving. The plain weaving is that the nickel wires and the graphite fibers are closely interwoven, and each nickel wire alternately passes through the top and bottom of a graphite fiber to form a regular checkered pattern. The weaving method has a stable structure and can provide good anti-scouring ability and mechanical strength. Because the nickel wires are evenly distributed in all directions, the impact force can be effectively dispersed when subjected to fluid scouring. In a medium-low pressure and medium flow rate fluid system, the plain weave nickel wire braided graphite ring can well resist the scouring of the fluid;

[0045] Furthermore, in order to reduce the pressure difference on both sides of the main sealing ring 4 when the valve core 2 is in the open state, a guide protrusion 13 protruding from the secondary sealing ring 9 and in an annular shape is provided on the secondary sealing ring 9 close to the inlet end of the valve body 1, and the side of the guide protrusion 13 away from the secondary sealing ring 9 is an arc-shaped surface, and an inwardly recessed pressure-bearing depression 11 is provided on the secondary sealing ring 9 away from the inlet end of the valve body 1, and the pressure-bearing depression 11 is an arc-shaped depression. The arc-shaped protrusion of the guide protrusion 13 can guide the fluid pressure to both sides, reducing the pressure directly acting on the side of the main sealing ring 4 close to the inlet of the valve body 1, and the pressure-bearing depression 11 is an arc-shaped depression, which can guide the fluid to the central area and increase the pressure away from the inlet side of the valve body 1, which is beneficial to the balance and stability of the valve core 2 and is also beneficial to adjusting the position of the valve core 2.

[0046] When in use, the main sealing ring 4 is crimped to one end of the valve core 2 through the crimping ring 7, and the sealing insert ring 10 is plugged and sealed with the sealing groove 8. One end of the adjusting rod 6 passes through the first through hole 23 and the second through hole 30 and extends to the receiving hole 12. The receiving hole 12 is crimped and covered by the crimping ring 7. The other end of the adjusting rod 6 is fixed to the inner wall of the valve cage 3 or the valve body 1. The elastic member 26 is located between the first push block 22 and the second push block 21 and can continuously apply pressure to the first push block 22 and the second push block 21. The first push block 22 transmits the pressure to the sealing insert ring 10 through the traction rod 18, so that the sealing insert ring 10 can be closely fitted to the inner wall of the sealing groove 8, thereby increasing the sealing performance and stability. The second push block 21 transmits the pressure to the third push block 20, and the third push block 20 transmits the pressure to the piston 19 through the plug rod 27, so that the piston 19 applies pressure to the annular cavity 14, and the inner wall of the annular cavity 14 is pressurized, so that the periphery of the main sealing ring 4 tends to deform and expand, so that the main sealing ring 4 and the cage 3 The pressure on the inner wall increases, thereby increasing the sealing performance. At the same time, due to the continuous existence of pressure, the wear on the edge of the main sealing ring 4 can be automatically compensated. Moreover, when the valve core 2 is opened, the valve core 2 and the adjusting rod 6 are relatively displaced, and the second through hole 30 and the recess 32 are relatively displaced. Subsequently, under the action of the slope 33, the second through hole 30 gradually corresponds to the part of the adjusting rod 6 other than the recess 32. At this time, due to the push of the slope 33, the second push block 21 is slightly displaced in the direction away from the third push block 20, and the pressure of the second push block 21 on the third push block 20 disappears, and then the pressure of the piston 19 on the annular cavity 14 disappears, and the pressure on the outer periphery of the main sealing ring 4 and the inner wall of the cage 3 is reduced, which can reduce wear and also facilitate the adjustment of the valve core 2 with less effort. When closing, the second through hole 30 will correspond to the second through hole 30 again, and the second push block 21 is pushed to the third push block 20 by the elastic member 26 again and presses the third push block 20, thereby increasing the pressure between the main sealing ring 4 and the inner wall of the cage 3 to ensure the sealing performance in the closed state;

[0047] In addition, when the valve core 2 is in the open state, in addition to being discharged to the branch pipe, the fluid will also flow through the internal flow channel of the valve body 1 to the side of the valve core 2 away from the inlet of the valve body 1. At this time, both sides of the edge of the main sealing ring 4 will also be subject to the pressure of the fluid. The arc-shaped protrusion of the guide protrusion 13 can guide the fluid pressure to both sides, reducing the pressure directly acting on the side of the main sealing ring 4 close to the inlet of the valve body 1. The pressure-bearing recess 11 is an arc-shaped recess, which can guide the fluid to the central area and increase the pressure away from the inlet side of the valve body 1, which is beneficial to the balance and stability of the valve core 2 and the main sealing ring 4, and is also beneficial to adjusting the position of the valve core 2.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A balanced sealing ring structure of a high-pressure bypass valve, comprising a valve body (1), a valve cage (3) arranged inside the valve body (1), a valve core (2) movably connected to the inner side of the valve cage (3), and a main sealing ring (4) arranged outside the valve cage (3), characterized in that: The main sealing ring (4) is provided with an automatic compensation component, and the automatic compensation component includes an annular cavity (14) arranged inside the outer periphery of the main sealing ring (4); an installation chamber (15) corresponding to the annular cavity (14) is evenly arranged on the inner side of the inner periphery of the main sealing ring (4); a piston hole (16) is arranged at one end of the installation chamber (15) close to the annular cavity (14); the annular cavity (14) and the installation chamber (15) are connected through the piston hole (16); a piston (19) is slidably connected to the inner side of the piston hole (16); a second push block (21) for applying pressure to the piston (19) is arranged on the side of the piston (19) away from the annular cavity (14); and an elastic member (26) for continuously applying pressure to the second push block (21) is arranged on the side of the second push block (21) away from the piston (19); The pressure regulating assembly also includes a second through hole (30) arranged on the second push block (21); an adjusting rod (6) corresponding to the second push block (21) is arranged on the inner wall of the valve body (1) or the valve cage (3); one end of the adjusting rod (6) passes through the second through hole (30) and extends to the inner side of the valve core (2); the adjusting rod (6) is movably connected to the second through hole (30) and the valve core (2); a notch (32) is arranged on one side of the adjusting rod (6); one end of the notch (32) is arranged with a slope that smoothly transitions to the side wall of the adjusting rod (6); The valve core (2) has a surface (33), when the valve core (2) is in a closed state with respect to the valve cage (3), the second through hole (30) corresponds to a portion of the recess (32), and when the valve core (2) is gradually opened, the second through hole (30) corresponds to a portion other than the recess (32) on the adjusting rod (6), and is configured such that when the second through hole (30) corresponds to the recess (32), the second push block (21) applies pressure to the piston (19), and when the second through hole (30) corresponds to a portion other than the recess (32) on the adjusting rod (6), the second push block (21) stops applying pressure to the piston (19).

2. A balanced sealing ring structure for a high-pressure bypass valve according to claim 1, characterized in that: A plug rod (27) is provided on one side of the piston (19) close to the second push block (21); a third push block (20) movably connected to the installation chamber (15) is provided on one end of the plug rod (27) close to the second push block (21); the second push block (21) is movably connected to the inner side of the installation chamber (15); and the second push block (21) is used to apply pressure to the third push block (20), so that the third push block (20) applies pressure to the piston (19) through the plug rod (27).

3. A balanced sealing ring structure for a high-pressure bypass valve according to claim 1, characterized in that: The main sealing ring (4) is fixed to one end of the valve core (2) by means of a crimping assembly, wherein the crimping assembly comprises a crimping ring (7) which is locked to one end of the valve core (2) by means of bolts, and the inner periphery of the main sealing ring (4) is pressed to one end of the valve core (2) by means of the crimping ring (7); Sealing insert rings (10) protruding from the side walls of the main sealing ring (4) are symmetrically arranged on both sides of the inner periphery of the main sealing ring (4); sealing grooves (8) corresponding to and matching the sealing insert rings (10) are arranged on the opposite sides of the crimping ring (7) and the valve core (2); the sealing insert rings (10) located on both sides of the main sealing ring (4) are respectively plugged into and matched with the sealing grooves (8) on the crimping ring (7) and the valve core (2).

4. A balanced sealing ring structure for a high-pressure bypass valve according to claim 3, characterized in that: The main sealing ring (4) and the crimping ring (7) are provided with a first through hole (23) corresponding to the second through hole (30); one end of the valve core (2) is provided with a receiving hole (12) corresponding to the first through hole (23), and the receiving hole (12) is a blind hole; one end of the adjusting rod (6) passes through the first through hole (23) and the second through hole (30) and extends toward the receiving hole (12); and the adjusting rod (6) is movably connected to the first through hole (23) and the receiving hole (12).

5. A balanced sealing ring structure for a high-pressure bypass valve according to claim 3, characterized in that: Annular grooves (17) adapted to the sealing insert ring (10) and connected to the installation chamber (15) are symmetrically arranged on both sides of the inner periphery of the main sealing ring (4); one end of the sealing insert ring (10) is movably connected to the inner side of the annular groove (17); The main sealing ring (4) is provided with a pressure-applying assembly for applying continuous pressure to the sealing insert ring (10), and the pressure-applying assembly includes a first push block (22) which is arranged at an end of the elastic member (26) away from the second push block (21) and movably connected to the installation chamber (15); a first connecting seat (25) is arranged on a side wall of an end of the sealing insert ring (10) close to the installation chamber (15); second connecting seats (31) corresponding to the first connecting seat (25) are arranged at both ends of the first push block (22); a traction rod (18) is arranged between the second connecting seat (31) and the corresponding first connecting seat (25), and the two ends of the traction rod (18) are movably connected to the first connecting seat (25) and the second connecting seat (31) respectively through a pin shaft.

6. A balanced sealing ring structure for a high-pressure bypass valve according to claim 5, characterized in that: The elastic member (26) is a spring.

7. A balanced sealing ring structure for a high-pressure bypass valve according to claim 5, characterized in that: A guide member is provided at one end of the inner side of the installation chamber (15) close to the first push block (22), and the guide member comprises a guide rod (24) fixed at one end of the inner side of the installation chamber (15) close to the first push block (22); a second guide hole (34) adapted to the guide rod (24) is provided at the middle of the first push block (22); a first guide hole (28) adapted to the guide rod (24) is provided at one side of the second push block (21) close to the guide rod (24); the first guide hole (28) is a blind hole; the first push block (22) is movably sleeved on the outside of the guide rod (24) through the second guide hole (34); and the second push block (21) is movably connected to the outside of the guide rod (24) through the first guide hole (28); The elastic member (26) is arranged outside the guide rod (24).

8. A balanced sealing ring structure for a high-pressure bypass valve according to claim 1, characterized in that: The outer periphery of the main sealing ring (4) protrudes from the side wall of the valve core (2), and auxiliary sealing rings (9) are symmetrically arranged on both sides of the protruding part of the main sealing ring (4), and the auxiliary sealing rings (9) are woven from nickel wires and graphite fibers.

9. A balanced sealing ring structure for a high-pressure bypass valve according to claim 8, characterized in that: The nickel wire and graphite fiber are braided in a plain weave.

10. A balanced sealing ring structure for a high-pressure bypass valve according to claim 8, characterized in that: A flow-guiding protrusion (13) protruding from the secondary sealing ring (9) and in an annular shape is provided on the secondary sealing ring (9) near the inlet end of the valve body (1), and a side of the flow-guiding protrusion (13) away from the secondary sealing ring (9) is an arc-shaped surface; A pressure-bearing recess (11) that is recessed inward is provided on the secondary sealing ring (9) at one end away from the inlet of the valve body (1), and the pressure-bearing recess (11) is an arc-shaped recess.

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