A sealed vacuum angle seat valve

Abstract

The present invention relates to the technical field of valve devices, and specifically to a sealed vacuum angle seat valve, comprising an external tube, a controller is arranged on the top of the external tube, a movable push rod is fixedly installed on the output end of the controller, a multi-stage sealing disk is fixedly installed on the end of the push rod away from the controller through a pressure sensor, a multi-stage step seat is fixedly installed on the inner side of the external tube, a base is fixedly installed on the bottom of the external tube, and a conversion mechanism is arranged on the inner side of the base; the present invention adopts the design of a multi-stage sealing disk and a multi-stage step seat, a first sealing gasket, a second sealing gasket and a third sealing gasket respectively perform sealing work, and when sealing, the three sealing gaskets respectively perform sealing work in turn, thereby increasing the service life of the angle seat valve, and the rotating turntable causes the second sealing gasket and the third sealing gasket to move upward, so that the three sealing gaskets can simultaneously contact the multi-stage sealing disk for sealing work, thereby forming a triple sealing state.

Description

Technical Field

[0001] The invention relates to the technical field of valve devices, in particular to a sealed vacuum angle seat valve. Background Art

[0002] The sealed vacuum angle seat valve is a control valve specially designed for use in vacuum systems. It is commonly found in the chemical, pharmaceutical, food, electronics and other industries. Its main function is to control the flow of fluid or gas in a pipeline by switching, adjusting or shutting off the flow. Unlike ordinary angle seat valves, the sealed vacuum angle seat valve is particularly suitable for use in high vacuum environments and can effectively avoid leakage, ensuring the safety and stability of the system.

[0003] Based on the relative movement of the valve seat and the valve core, the interior of the valve body is composed of the valve core and the valve seat. When the valve is operated, the movement of the valve core controls the opening and closing of the fluid channel, thereby adjusting the flow or pressure in the pipeline. Its uniqueness lies in the ability to maintain precise sealing in a vacuum environment to avoid air leakage.

[0004] A Chinese patent with announcement number CN117823645B discloses a pilot-operated pneumatic angle seat valve, including a valve body, wherein a first port and a second port are respectively provided on both sides of the lower end of the valve body. A sealing disc is used instead of a valve core sealing gasket to improve the wear resistance of the valve core and further improve the sealing performance. The angle seat valve can also be quickly connected to a hose, is easy to install, has good sealing performance, and is convenient for later disassembly and maintenance.

[0005] A Chinese patent with announcement number CN116658632B discloses an angle seat valve, including a valve body, a sleeve, a valve core, and a valve cover. The valve body has a valve cavity inside, the sleeve is sleeved in the valve cavity, and the valve core is sleeved in the sleeve. The angle seat valve of the present invention has a simple structure and stable operation. It has multiple functions such as cut-off, active adjustment, passive adjustment or check, realizes the multifunctional setting of the angle seat valve, can be applied to more application scenarios, and improves the use value of the angle seat valve.

[0006] The above-mentioned and similar prior arts can improve the sealing effect of the angle seat valve to a certain extent. However, the valve core sealing gasket of the existing angle seat valve is easily damaged, aged or deformed after working for a long time due to the influence of factors such as high temperature, high pressure or medium corrosion, thereby causing sealing failure. Once the sealing failure occurs, the existing angle seat valve can only restore normal function by disassembling, repairing and replacing the sealing gasket. This maintenance method is not only time-consuming and labor-intensive, but also increases maintenance costs and greatly reduces the service life of the angle seat valve. In addition, in a high-pressure and strength difference working environment, a single valve core sealing gasket is often unable to withstand excessive pressure and cannot provide effective sealing, which further reduces the sealing effect and affects the stability and working efficiency of the system. It is urgent to adopt effective technical means to improve the sealing performance, extend the service life of the angle seat valve, and improve its sealing reliability under extreme working conditions.

[0007] Therefore, the present invention provides a sealed vacuum angle seat valve which can improve the sealing performance, prolong the service life of the angle seat valve, and improve the sealing reliability under extreme working conditions. Summary of the invention

[0008] A sealed vacuum angle seat valve is designed to solve the problems that a single valve core sealing gasket in the prior art has a short service life and poor sealing performance in a high-pressure environment.

[0009] The technical solution adopted by the present invention to solve its technical problem is: a sealed vacuum angle seat valve, including an external through-tube, a movable push rod is arranged on the inner side of the external through-tube, a multi-stage sealing disk is fixedly installed on the end of the push rod away from the controller through a pressure sensor, the multi-stage sealing disk includes sealing disk 1, sealing disk 2 and sealing disk 3, a multi-stage step seat is fixedly installed on the inner side of the external through-tube, the multi-stage step seat includes a sealing seat, one side of the sealing seat is respectively provided with step 3, step 2 and step 1, a first sealing gasket is fixedly installed on the top of step 1, and the sealing gasket is fixedly installed on the top of the step 1. A base is fixedly installed at the bottom of the external through pipe, and a conversion mechanism is arranged on the inner side of the base, and the conversion mechanism includes a first and a second earth-shaped ring, a second sealing gasket is fixedly installed on the top of the first earth-shaped ring, and a third sealing gasket is fixedly installed on the top of the second earth-shaped ring; a multi-stage sealing disk, which is assembled to seal by controlling the first, second and third sealing disks to cooperate with the step three, step two and step one of the multi-stage step seat; a conversion mechanism, which is assembled to determine the working state of the second and third sealing gaskets by controlling the positions of the first and second earth-shaped rings.

[0010] Furthermore, an angle tube is fixedly installed on the top of the external tube, a controller is arranged on the top of the angle tube, and an output end of the controller passes through the top of the angle tube and is fixedly connected to one end of the push rod.

[0011] Furthermore, a movable groove one is provided at the bottom of the sealing disk one, a convex ring is fixedly installed on the inner side of the top wall of the movable groove one, a large spring is fixedly installed on the bottom of the convex ring, and the other end of the large spring is fixedly installed on the bottom of the sealing disk two, and the sealing disk two is connected and slidably with the limiting groove on the inner side of the movable groove one through the outer limiting plate, a storing groove is provided at the top of the sealing disk two, and the storing groove is located on the outer side of the convex ring and the large spring, a movable groove two is provided at the bottom of the sealing disk two, a small spring is fixedly installed on the inner side of the top wall of the movable groove two, and the other end of the small spring is fixedly connected to the top of the sealing disk three, and the sealing disk three is connected and slidably with the limiting groove on the inner side of the movable groove two through the outer limiting plate.

[0012] Furthermore, two sealing grooves of different diameters are opened inside the sealing seat, the sealing groove with a smaller diameter is connected to the top of step two, and the sealing groove with a larger diameter is connected to the top of step three, and the second sealing gasket is located at the top of step two, and the third sealing gasket is located at the top of step three.

[0013] Furthermore, a rotating groove 1 is provided at the bottom of the base, a rotating groove 2 is provided on the inner side of the top wall of the rotating groove 1, a threaded rod is rotatably installed on the inner side of the top wall of the rotating groove 2 through a bearing, two sections of threads with different pitches are provided on the outer side of the threaded rod, and the pitch of the thread of the threaded rod near the top is smaller, a turntable is fixedly installed at the bottom of the threaded rod, and the turntable is rotatably installed on the inner side of the rotating groove 1 through a sealed bearing.

[0014] Furthermore, the conversion mechanism also includes threaded plate 1 and threaded plate 2, both of which are threadedly installed on the outside of the threaded rod, and threaded plate 1 is threadedly connected to the threaded rod at a smaller pitch position, and threaded plate 2 is threadedly connected to the threaded rod at a larger pitch position, threaded plate 1 is located on the inner side of rotating groove 2, and threaded plate 2 is located on the inner side of rotating groove 1.

[0015] Furthermore, the top of the threaded plate one is fixedly connected to the bottom of the earth-shaped ring one through a plurality of connecting rods, and the earth-shaped ring one is located on the inner side of the sealing groove with a smaller diameter, and the top of the threaded plate two is fixedly connected to the bottom of the earth-shaped ring two through another plurality of connecting rods, and the earth-shaped ring two is located on the inner side of the sealing groove with a larger diameter.

[0016] Furthermore, the spacing between the two horizontal plates of the Tu-shaped ring 1 is greater than the spacing between the two horizontal plates of the Tu-shaped ring 2, and two sealing rings 1 are fixedly installed on the top of the horizontal plates near the top of the Tu-shaped ring 1 and the Tu-shaped ring 2, and sealing rings 2 are fixedly installed on the bottom of the horizontal plates near the bottom of the Tu-shaped ring 1 and the Tu-shaped ring 2.

[0017] Beneficial effects of the present invention:

[0018] (1) The sealed vacuum angle seat valve described in the present invention adopts a multi-stage sealing disc and a multi-stage step seat design to achieve a multi-level, progressive sealing effect. The first sealing gasket, the second sealing gasket and the third sealing gasket respectively undertake different sealing tasks and have independent sealing functions to ensure the sealing effect under different working conditions. When the sealing operation is performed, the first sealing gasket starts the sealing work first to ensure the initial sealing effect. When the first sealing gasket is damaged or the seal fails, the push rod continues to move and automatically starts the second sealing gasket for continued sealing. Similarly, when the second sealing gasket fails, the third sealing gasket will take over its position and continue to maintain the sealing effect. Through this progressive sealing mechanism, the role of each layer of sealing gasket is fully utilized. In the process of multiple sealing gaskets gradually taking over, it can avoid complete leakage of the system due to the failure of a single seal, thereby significantly improving the sealing reliability and the service life of the angle seat valve, and enhancing the safety and durability of the system.

[0019] (2) The sealed vacuum angle seat valve described in the present invention adopts an innovative conversion mechanism design. Under high-pressure working environment, the second sealing gasket and the third sealing gasket are moved upward by rotating the turntable, so that the three sealing gaskets can contact the multi-stage sealing disk at the same time and cooperate to perform sealing work, thereby forming a triple sealing state. Combined with the above effects, the angle seat valve can switch between two working modes. The triple sealing state of the second form effectively increases the sealing level, so that the angle seat valve can continue to maintain an extremely high sealing effect under high pressure and complex working conditions, significantly improving the sealing reliability and system stability. The user can flexibly adjust the working state of the sealing gasket, further enhancing the adaptability and life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the angle seat valve of the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the external through pipe of the present invention;

[0023] Figure 3 For the present invention Figure 2 A local enlarged structural schematic diagram;

[0024] Figure 4 It is a schematic diagram of the exploded three-dimensional structure of the multi-stage sealing disk of the present invention;

[0025] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the multi-stage sealing seat of the present invention;

[0026] Figure 6It is a schematic diagram of the three-dimensional structure of the threaded rod of the present invention;

[0027] Figure 7 It is a cross-sectional three-dimensional structural schematic diagram of the conversion mechanism of the present invention;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the local enlarged structure at point B.

[0029] In the figure: 1. external through pipe; 2. angle through pipe; 3. controller; 4. push rod; 5. pressure sensor; 6. multi-stage sealing disk; 61. sealing disk one; 62. movable groove one; 63. convex ring; 64. large spring; 65. sealing disk two; 66. storage groove; 67. movable groove two; 68. small spring; 69. sealing disk three; 7. multi-stage step seat; 71. sealing seat; 72. step three; 73. step two; 74. step one; 75. sealing groove; 8. first sealing gasket; 9. base; 10. rotating groove one; 11. rotating groove two; 12. threaded rod; 13. rotating disk; 14. conversion mechanism; 141. threaded plate one; 142. connecting rod; 143. earth-shaped ring one; 144. threaded plate two; 145. earth-shaped ring two; 146. sealing ring one; 147. sealing ring two; 15. second sealing gasket; 16. third sealing gasket. DETAILED DESCRIPTION

[0030] In order to make the technical means, technical features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] Example: Figure 1-Figure 8 As shown, a sealed vacuum angle seat valve described in the present invention includes an external through-tube 1, a controller 3 is arranged on the top of the external through-tube 1, a movable push rod 4 is fixedly installed on the output end of the controller 3, an angle through-tube 2 is fixedly installed on the top of the external through-tube 1, the controller 3 is fixedly installed on the top of the angle through-tube 2, and the output end of the controller 3 passes through the top of the angle through-tube 2.

[0032] Specifically, the outer through-tube 1 can provide a stable support for the angle through-tube 2 , the angle through-tube 2 can provide a stable support for the controller 3 , the controller 3 can provide a driving force for the push rod 4 , and the controller 3 can control the rise and fall of the push rod 4 .

[0033] In this embodiment, a multi-stage sealing disk 6 is fixedly installed at one end of the push rod 4 away from the controller 3 through the pressure sensor 5. The multi-stage sealing disk 6 includes a sealing disk 1 61. A sealing disk 2 65 and a sealing disk 3 69 are elastically arranged on one side of the sealing disk 1 61 away from the pressure sensor 5. The multi-stage sealing disk 6 is assembled to perform sealing by controlling the sealing disk 1 61, the sealing disk 2 65 and the sealing disk 3 69. A movable groove 1 62 is provided at the bottom of the sealing disk 1 61. A convex ring 63 is fixedly installed on the inner side of the top wall of the movable groove 1 62. A large spring 64 is fixedly installed at the bottom of the convex ring 63. The other end of 64 is fixedly installed on the bottom of the sealing disk 2 65, and the sealing disk 2 65 is connected and slidably cooperated with the limiting groove inside the movable groove 1 62 through the outer limiting plate, and a receiving groove 66 is provided on the top of the sealing disk 2 65, and the receiving groove 66 is located on the outside of the convex ring 63 and the large spring 64, and a movable groove 2 67 is provided on the bottom of the sealing disk 2 65, and a small spring 68 is fixedly installed on the inner side of the top wall of the movable groove 2 67, and the other end of the small spring 68 is fixedly connected to the top of the sealing disk 3 69, and the sealing disk 3 69 is connected and slidably cooperated with the limiting groove inside the movable groove 2 67 through the outer limiting plate.

[0034] Specifically, the push rod 4 can provide a stable support for the pressure sensor 5, and the pressure sensor 5 can monitor the reaction force of the multi-stage sealing disk 6. When the first sealing gasket 8, the second sealing gasket 15 and the third sealing gasket 16 perform sealing work respectively, the reaction forces generated by the multi-stage sealing disk 6 are different. The working state of the three sealing gaskets is determined by the pressure of the push rod 4 on the pressure sensor 5. When the sealing disk 3 69 just contacts the first sealing gasket 8, the small spring 68 and the large spring 64 are not deformed. At this time, the distance between the second sealing gasket 15 and the sealing disk 2 65 is smaller than that between the third sealing gasket 16 and the sealing disk 1 61 The spacing between the third sealing gasket 16 and the sealing disk 61 is such that when the second sealing gasket 15 performs the sealing work, the third sealing gasket 16 and the sealing disk 161 can maintain a certain gap, so that the third sealing gasket 16 can be in a non-working state, and then the three sealing gaskets can perform the sealing work one by one. The elastic coefficient of the large spring 64 is not less than the elastic coefficient of the small spring 68. When the small spring 68 increases the extrusion on the first sealing gasket 8, the small spring 68 and the large spring 64 are deformed by the pressure at the same time, and the compression amount of the large spring 64 is much less than the compression amount of the small spring 68, so as to ensure that the three sealing gaskets perform the sealing work one by one.

[0035] In this embodiment, a multi-step seat 7 is fixedly installed on the inner side of the external through pipe 1, and the multi-step seat 7 includes a sealing seat 71. One side of the sealing seat 71 is respectively provided with step three 72, step two 73 and step one 74, and the top of step one 74 is fixedly installed with a first sealing gasket 8. The multi-step seat 7 is assembled to cooperate with the multi-step sealing disk 6 for sealing through step three 72, step two 73 and step one 74; two sealing grooves 75 of different diameters are provided inside the sealing seat 71, and the sealing groove 75 of smaller diameter is communicated with the top of step two 73, and the sealing groove 75 of larger diameter is communicated with the top of step three 72.

[0036] Specifically, the external through tube 1 can provide a stable support for the sealing seat 71, the sealing seat 71 can provide an opening space for step three 72, step two 73 and step one 74 respectively, step one 74 can provide a stable support for the first sealing gasket 8, and the sealing seat 71 can provide an opening space for two sealing grooves 75. The two sealing grooves 75 have different diameters and the same cross-sectional shape. The two sealing grooves 75 can respectively perform a sealing effect with the earth-shaped ring one 143 and the earth-shaped ring two 145.

[0037] In this embodiment, a base 9 is fixedly installed at the bottom of the external through pipe 1, a rotating groove 10 is opened at the bottom of the base 9, a rotating groove 11 is opened on the inner side of the top wall of the rotating groove 10, a threaded rod 12 is rotatably installed on the inner side of the top wall of the rotating groove 11 through a bearing, two sections of threads with different pitches are opened on the outer side of the threaded rod 12, and the pitch of the thread of the threaded rod 12 near the top is smaller, a turntable 13 is fixedly installed at the bottom of the threaded rod 12, and the turntable 13 is rotatably installed on the inner side of the rotating groove 10 through a sealed bearing.

[0038] Specifically, the base 9 can provide opening space for the rotating groove 10 and the rotating groove 2 11, the rotating groove 2 11 can provide a rotation space for the threaded rod 12, and the rotating groove 2 11 can provide a movable space for the threaded plate 141, the rotating groove 10 can provide a rotation space for the rotating plate and the sealing plate 2, the rotating groove 10 can provide a rotating sealing function for the turntable 13 through the sealing bearing, and the bottom of the turntable 13 is provided with two semicircular grooves, and a protrusion in the middle is left to provide support for the rotation of the staff.

[0039] In this embodiment, a conversion mechanism 14 is provided on the inner side of the base 9, and the conversion mechanism 14 includes a soil-shaped ring 143 and a soil-shaped ring 2 145. A second sealing gasket 15 is fixedly installed on the top of the soil-shaped ring 143, and a third sealing gasket 16 is fixedly installed on the top of the soil-shaped ring 2 145, and the second sealing gasket 15 is located at the top of the step 2 73, and the third sealing gasket 16 is located at the top of the step 3 72; the conversion mechanism 14 is assembled to determine the working state of the second sealing gasket 15 and the third sealing gasket 16 by controlling the positions of the soil-shaped ring 143 and the soil-shaped ring 2 145, and the conversion mechanism 14 also includes a threaded plate 141 and a threaded plate 2 144, and the threaded plate 141 and the threaded plate 2 144 are both threadedly installed on the outer side of the threaded rod 12, and the threaded plate 141 is threadedly connected to the threaded rod 12 at a smaller pitch position, and the threaded plate 2 144 is threadedly connected to the threaded rod 12 is threadedly connected at a position with a larger pitch, threaded plate 141 is located on the inner side of rotating groove 2 11, threaded plate 2 144 is located on the inner side of rotating groove 10, the top of threaded plate 141 is fixedly connected to the bottom of earth-shaped ring 143 through multiple connecting rods 142, and earth-shaped ring 143 is located on the inner side of sealing groove 75 with a smaller diameter, the top of threaded plate 2 144 is fixedly connected to the bottom of earth-shaped ring 2 145 through another multiple connecting rods 142, and earth-shaped ring 2 145 is located on the inner side of sealing groove 75 with a larger diameter, the spacing between two horizontal plates of earth-shaped ring 143 is greater than the spacing between two horizontal plates of earth-shaped ring 2 145, two sealing rings 146 are fixedly installed on the tops of the horizontal plates near the top of earth-shaped ring 143 and earth-shaped ring 2 145, and sealing rings 2 147 are fixedly installed on the bottoms of the horizontal plates near the bottom of earth-shaped ring 143 and earth-shaped ring 2 145.

[0040] Specifically, the sealing groove 75 can provide space for the earth-shaped ring 145 and the earth-shaped ring 143 to move up and down. The earth-shaped ring 143 and the top of the step 2 73 are at the same horizontal plane. The earth-shaped ring 143 can provide a firm support for the second sealing gasket 15, so that the second sealing gasket 15 is just completely at the top of the step 2 73. The top of the earth-shaped ring 145 and the top of the step 3 72 are at the same horizontal plane. The earth-shaped ring 145 can provide a firm support for the third sealing gasket 16, so that the third sealing gasket 16 is just completely at the top of the step 3 72, so that the initial states of the three sealing gaskets are the same. The sealing ring 2 147 in the initial state contacts the inner side of the bottom wall of the sealing groove 75 to seal the sealing groove 75. When the turntable 13 rotates to drive the earth-shaped ring 143 and the earth-shaped ring 145 to move upward, the sealing ring 1 146 on the inner side of the two sealing grooves 75 contacts the inner side of the top wall of the sealing groove 75 to seal the sealing groove 75 again.

[0041] Working principle: The staff first seals and connects the two ends of the external pipe 1 to the external pipes, and then determines the working mode of the angle seat valve before use;

[0042] When the first sealing gasket 8, the second sealing gasket 15 and the third sealing gasket 16 need to work respectively, the staff controls the push rod 4 to move downward through the controller 3, so that the push rod 4 drives the multi-stage sealing disk 6 to move downward, so that the bottom sealing disk three 69 contacts with the first sealing gasket 8, and continues to control the push rod 4 to move downward through the controller 3. At this time, the sealing disk three 69 squeezes the small spring 68 under the reaction force of the second sealing gasket 15, and the failed spring is compressed, thereby increasing the squeezing force between the sealing disk three 69 and the first sealing gasket 8. At this time, only the first sealing gasket 8 performs the sealing work, and the sealing disk two 65 does not contact with the second sealing gasket 15. When the first sealing gasket 8 is damaged and fails, the push rod 4 is continued to be controlled to move downward so that the sealing disk two 65 contacts with the second sealing gasket 15 contacts, and uses the reaction force to squeeze the large spring 64, so that the reaction force of the large spring 64 squeezes the sealing disk 2 65 into the second sealing gasket 15, at this time, only the second sealing gasket 15 performs the sealing work, similarly, when the second sealing gasket 15 is damaged and fails, the push rod 4 is pushed again, so that the sealing disk 1 61 squeezes the third sealing gasket 16, at this time, only the third sealing gasket 16 performs the sealing work, in summary, the first sealing gasket 8, the second sealing gasket 15 and the third sealing gasket 16 can perform separate sealing work respectively, when the sealing gasket performing the sealing work is damaged and fails, by increasing the strength of the push rod 4, the next sealing gasket replaces the failed sealing gasket to perform the sealing work, so that the three sealing gaskets perform the sealing work in turn, thereby increasing the service life of the angle seat valve;

[0043] When the first sealing gasket 8, the second sealing gasket 15 and the third sealing gasket 16 need to work at the same time, the rotating disk 13 is grasped and rotated, so that the rotating disk 13 drives the threaded rod 12 to rotate, and the threaded rod 12 uses its own two-segment thread action to drive the threaded plate 141 and the threaded plate 2 144 to move upward at the same time. The moving speed of the threaded plate 2 144 is greater than the moving speed of the threaded plate 141, so that the threaded plate 141 and the threaded plate 2 144 drive the earth-shaped ring 143 and the earth-shaped ring 2 145 to move upward through the connecting rod 142, so that the earth-shaped ring 143 drives The second sealing gasket 15 moves upward to a position in contact with the sealing disk 1 61, and the earth-shaped ring 2 145 drives the third sealing gasket 16 to move upward to a position in contact with the sealing disk 2 65. At this time, the first sealing gasket 8, the second sealing gasket 15 and the third sealing gasket 16 are in contact with the sealing disk 3 69, the sealing disk 2 65 and the sealing disk 1 61 respectively, pushing the push rod 4 to compress the small spring 68 and the large spring 64, so that the three sealing disks squeeze the three sealing gaskets respectively, and the three sealing gaskets perform a sealing effect at the same time, thereby improving the sealing effect of the angle seat valve.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. 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, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sealed vacuum angle seat valve, comprising an external communication pipe (1), characterized in that: A movable push rod (4) is arranged on the inner side of the external communication tube (1); a multi-stage sealing disk (6) is fixedly mounted on one end of the push rod (4) away from the controller (3) via a pressure sensor (5); the multi-stage sealing disk (6) comprises a sealing disk 1 (61), a sealing disk 2 (65) and a sealing disk 3 (69); a multi-stage step seat (7) is fixedly mounted on the inner side of the external communication tube (1); the multi-stage step seat (7) comprises a sealing seat (71); and one side of the sealing seat (71) is provided with a step 3 (72), a step 4 (73) and a step 5 (74) respectively. Step 2 (73) and step 1 (74), a first sealing gasket (8) being fixedly mounted on the top of step 1 (74), a base (9) being fixedly mounted on the bottom of the external through pipe (1), a conversion mechanism (14) being arranged on the inner side of the base (9), the conversion mechanism (14) comprising a first earth-shaped ring (143) and a second earth-shaped ring (145), a second sealing gasket (15) being fixedly mounted on the top of the first earth-shaped ring (143), and a third sealing gasket (16) being fixedly mounted on the top of the second earth-shaped ring (145); A multi-stage sealing disk (6) is assembled to seal by controlling the sealing disk 1 (61), the sealing disk 2 (65) and the sealing disk 3 (69) to cooperate with the step 3 (72), the step 2 (73) and the step 1 (74) of the multi-stage step seat (7); The conversion mechanism (14) is configured to determine the working state of the second sealing gasket (15) and the third sealing gasket (16) by controlling the positions of the first earth-shaped ring (143) and the second earth-shaped ring (145).

2. The sealed vacuum angle seat valve according to claim 1, characterized in that: An angle tube (2) is fixedly mounted on the top of the external tube (1), a controller (3) is arranged on the top of the angle tube (2), and an output end of the controller (3) passes through the top of the angle tube (2) and is fixedly connected to one end of a push rod (4).

3. The sealed vacuum angle seat valve according to claim 1, characterized in that: The bottom of the sealing disk 1 (61) is provided with a movable groove 1 (62), the inner side of the top wall of the movable groove 1 (62) is fixedly mounted with a convex ring (63), the bottom of the convex ring (63) is fixedly mounted with a large spring (64), the other end of the large spring (64) is fixedly mounted on the bottom of the sealing disk 2 (65), the sealing disk 2 (65) is slidably connected with the inner side of the movable groove 1 (62) through the outer limiting plate, the top of the sealing disk 2 (65) is provided with a receiving groove (66), and the receiving groove (66) is located outside the convex ring (63) and the large spring (64), the bottom of the sealing disk 2 (65) is provided with a movable groove 2 (67), the inner side of the top wall of the movable groove 2 (67) is fixedly mounted with a small spring (68), the other end of the small spring (68) is fixedly connected with the top of the sealing disk 3 (69), and the sealing disk 3 (69) is slidably connected with the inner side of the movable groove 2 (67) through the outer limiting plate.

4. The sealed vacuum angle seat valve according to claim 1, characterized in that: The sealing seat (71) has two sealing grooves (75) of different diameters formed therein, the sealing groove (75) with a smaller diameter being in communication with the top of the second step (73), and the sealing groove (75) with a larger diameter being in communication with the top of the third step (72), and the second sealing gasket (15) being located at the top of the second step (73), and the third sealing gasket (16) being located at the top of the third step (72).

5. The sealed vacuum angle seat valve according to claim 1, characterized in that: The bottom of the base (9) is provided with a first rotating groove (10), the inner side of the top wall of the first rotating groove (10) is provided with a second rotating groove (11), the inner side of the top wall of the second rotating groove (11) is provided with a threaded rod (12) rotatably mounted via a bearing, the outer side of the threaded rod (12) is provided with two sections of threads with different pitches, the threaded rod (12) having a smaller pitch near the top, a rotating disk (13) fixedly mounted at the bottom of the threaded rod (12), and the rotating disk (13) is rotatably mounted on the inner side of the first rotating groove (10) via a sealed bearing.

6. The sealed vacuum angle seat valve according to claim 5, characterized in that: The conversion mechanism (14) further comprises a threaded plate 1 (141) and a threaded plate 2 (144), wherein the threaded plate 1 (141) and the threaded plate 2 (144) are both threadedly mounted on the outside of the threaded rod (12), and the threaded plate 1 (141) is threadedly connected to the threaded rod (12) at a position with a smaller thread pitch, and the threaded plate 2 (144) is threadedly connected to the threaded rod (12) at a position with a larger thread pitch, the threaded plate 1 (141) is located on the inside of the second rotation groove (11), and the threaded plate 2 (144) is located on the inside of the first rotation groove (10).

7. The sealed vacuum angle seat valve according to claim 6, characterized in that: The top of the threaded plate 1 (141) is fixedly connected to the bottom of the earth-shaped ring 1 (143) via a plurality of connecting rods (142), and the earth-shaped ring 1 (143) is located inside the sealing groove (75) with a smaller diameter. The top of the threaded plate 2 (144) is fixedly connected to the bottom of the earth-shaped ring 2 (145) via another plurality of connecting rods (142), and the earth-shaped ring 2 (145) is located inside the sealing groove (75) with a larger diameter.

8. The sealed vacuum angle seat valve according to claim 7, characterized in that: The spacing between the two transverse plates of the first earth-shaped ring (143) is greater than the spacing between the two transverse plates of the second earth-shaped ring (145). The tops of the transverse plates of the first earth-shaped ring (143) and the second earth-shaped ring (145) near the top are respectively fixedly mounted with two first sealing rings (146), and the bottoms of the transverse plates of the first earth-shaped ring (143) and the second earth-shaped ring (145) near the bottom are respectively fixedly mounted with second sealing rings (147).

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