A ceramic valve core vacuum regulating valve

Abstract

The present invention belongs to the application field of uranium enrichment process, and specifically discloses a ceramic valve core vacuum regulating valve, wherein the valve seat and the valve core are made of ceramic material, the valve seat is located inside the valve body and is fixedly connected to the valve body; the valve core is located inside the valve seat and is connected with the valve seat; the bracket is located above the valve body and is fixedly connected to the valve body; the actuator is located above the bracket, the valve stem is located inside the bracket, and the valve stem is respectively fixedly connected to the actuator and the valve core; the bellows and the packing device are sleeved on the valve stem, the bellows is located inside the bracket, the packing device is located above the bellows, the packing device is fixedly connected to the bracket, and the bellows is fixedly connected to the packing device; the disc spring and the disc spring pressure plate are sleeved on the packing device, the disc spring pressure plate is located above the disc spring, and the disc spring pressure plate is fixedly connected to the bracket. The valve core and valve seat of the present invention are made of ceramic material, have good abrasion resistance, high processing accuracy, and good sealing performance.

Description

Technical Field

[0001] The invention belongs to the application field of uranium enrichment process, and in particular relates to a ceramic valve core vacuum regulating valve. Background Art

[0002] The valve stem of the electric vacuum regulating valve drives the valve core to move linearly under the push of the actuator, and by changing the flow area between the valve core and the valve seat, the purpose of regulating the medium flow and stabilizing the pressure behind the valve is achieved.

[0003] At present, the valve core and valve seat of the vacuum regulating valve used in the feeding system of the uranium enrichment plant are mostly made of stainless steel, and engineering ceramic valve core and valve seat have not yet been applied to the uranium enrichment process.

[0004] Meanwhile, the seals between the valve core and the valve seat of the existing vacuum regulating valve are mostly metal hard seals, which require large sealing force and high processing accuracy of metal parts.

[0005] In addition, ceramic valve cores and valve seats are not easy to process threads, so it is difficult to connect with other parts. This limits its application in corrosive media and long-term wear situations, and its excellent corrosion resistance is limited by the structure and cannot be fully utilized.

[0006] Therefore, it is necessary to design a vacuum regulating valve with a ceramic valve core and superior structure to meet production needs. Summary of the invention

[0007] The object of the present invention is to provide a ceramic valve core vacuum regulating valve, the valve core and valve seat of the regulating valve are made of ceramic material, have good abrasion resistance, high processing accuracy and good sealing performance.

[0008] The technical solution to achieve the purpose of the present invention is:

[0009] A ceramic valve core vacuum regulating valve, the vacuum regulating valve comprising: a valve body, a valve seat, a valve stem, a disc spring, a disc spring pressure plate, an actuator, a bracket, a valve core, a bellows and a packing device; the valve seat and the valve core are made of ceramic material, the valve seat is located inside the valve body, and the valve seat is fixedly connected to the valve body; the valve core is located inside the valve seat, and the valve core is engaged and connected to the valve seat; the bracket is located above the valve body, and the bracket is fixedly connected to the valve body; the actuator is located above the bracket, the valve stem is located inside the bracket, the top of the valve stem extends into the actuator, and the top of the valve stem is connected to the actuator The bottom of the valve stem extends to the inside of the valve core, and the bottom of the valve stem is fixedly connected to the valve core; the bellows and the stuffing device are sequentially sleeved on the valve stem from bottom to top, the bellows is located inside the bracket, the stuffing device is located above the bellows, the stuffing device is fixedly connected to the bracket, and the bellows is fixedly connected to the stuffing device; the disc spring is sleeved on the stuffing device, the disc spring pressure plate is sleeved on the top of the stuffing device and is located above the disc spring, the disc spring is respectively engaged with the stuffing device and the disc spring pressure plate, and the disc spring pressure plate is fixedly connected to the bracket.

[0010] Furthermore, the vacuum regulating valve also includes a valve core locking nut and a valve stem connecting sleeve, and the bottom of the valve stem and the valve core are fixedly connected through the threaded cooperation between the valve core locking nut and the valve stem connecting sleeve.

[0011] Furthermore, a boss is provided on the upper part of the valve core along the outer circumference, and a lower connecting surface matching with the boss of the valve core is provided at the bottom end of the valve stem connecting sleeve, and the valve core is installed in the valve stem connecting sleeve through the boss structure of the ceramic valve core matching with the lower connecting surface of the valve stem connecting sleeve; the bottom end of the valve stem is located in the internal matching hole of the valve core, and a boss is provided on the bottom of the valve stem along the outer circumference, and the boss at the bottom of the valve stem is located on the top surface of the valve core, and the bottom end of the valve stem is inserted into the matching hole of the valve core through the matching of the boss structure at the bottom of the valve stem and the matching hole of the valve core; the valve core locking nut is sleeved on the valve stem and is located in the upper connecting hole of the valve stem connecting sleeve, and the valve core locking nut is fixedly connected to the valve stem connecting sleeve by threaded matching.

[0012] Furthermore, the vacuum regulating valve also includes a buffer pad on the valve core and a metal anti-friction ring, which are sequentially mounted on the valve stem from bottom to top, and the buffer pad on the valve core and the metal anti-friction ring are located between the valve core locking nut and the boss at the bottom of the valve stem, and the metal anti-friction ring is respectively engaged with the valve core locking nut and the buffer pad on the valve core, and the buffer pad on the valve core is respectively engaged with the metal anti-friction ring and the boss at the bottom of the valve stem.

[0013] Furthermore, the vacuum regulating valve also includes a valve core lower cushion, which is located between the boss at the bottom of the valve stem and the valve core, and is respectively engaged with the boss at the bottom of the valve stem and the valve core.

[0014] Furthermore, the valve core lower buffer pad and the valve core upper buffer pad are both made of graphite.

[0015] Furthermore, the vacuum regulating valve also includes a valve seat locking nut, and the valve seat and the valve body are fixedly connected through the threaded cooperation of the valve seat locking nut and the valve body.

[0016] Furthermore, a boss is provided on the upper part of the valve seat along the outer circumference, and a boss protruding inward is provided in the lower recess of the valve body, and the boss on the lower recess of the valve body cooperates with the boss of the valve seat; the bottom of the valve core is located in the internal through hole of the valve seat, and a step is provided on the bottom of the valve core along the outer circumference, and the bottom step of the valve core is engaged and connected with the top end of the through hole of the valve seat; the valve seat locking nut is sleeved on the valve core, the valve seat locking nut is located on the valve seat, the valve seat locking nut is fixedly connected to the valve seat by threads, and the bottom end of the valve seat locking nut is tightened against the valve seat.

[0017] Furthermore, the vacuum regulating valve also includes a ceramic pressure pad, which is sleeved on the inner side of the valve seat locking nut and located between the valve seat and the valve seat locking nut, and the ceramic pressure pad is respectively engaged with the valve seat and the valve seat locking nut.

[0018] Furthermore, a boss is provided along the outer circumference of the bottom of the ceramic pressure pad, the valve seat locking nut is located on the boss of the ceramic pressure pad, and the bottom end of the valve seat locking nut is tightly pressed against the boss of the ceramic pressure pad.

[0019] Furthermore, the vacuum regulating valve also includes a ceramic pressure pad wear-reducing ring, which is located between the valve seat locking nut and the boss of the ceramic pressure pad, and the ceramic pressure pad wear-reducing ring is respectively engaged and connected with the valve seat locking nut and the boss of the ceramic pressure pad.

[0020] Furthermore, the vacuum regulating valve also includes a valve seat buffer pad, which is located between the valve seat and the valve body, and the valve seat buffer pad is respectively engaged and connected with the valve seat and the valve body.

[0021] Furthermore, the valve seat buffer is made of graphite.

[0022] Furthermore, the vacuum regulating valve also includes a valve body nut and a valve body stud, and the bracket and the valve body are fixedly connected through the threaded cooperation of the valve body nut and the valve body stud.

[0023] Furthermore, the packing device includes a stuffing box, a stuffing cylinder, and packing, the stuffing is arranged in a stuffing groove formed between the stuffing box and the valve stem, the stuffing cylinder is sleeved on the valve stem, the stuffing cylinder is located above the stuffing box, and the bottom of the stuffing cylinder is located in the stuffing groove of the stuffing box.

[0024] Furthermore, the disc spring is located on the boss of the packing pressure cylinder, and the disc spring is respectively engaged and connected with the packing pressure cylinder and the disc spring pressure plate.

[0025] Furthermore, the vacuum regulating valve also includes an adjusting pad, which is sleeved on the packing pressure cylinder and located at the bottom of the disc spring. The adjusting pad is respectively engaged and connected with the disc spring and the packing pressure cylinder.

[0026] Furthermore, the vacuum regulating valve also includes a pressure plate nut and a pressure plate stud, and the disc spring pressure plate and the bracket are fixedly connected through the threaded cooperation of the pressure plate nut and the pressure plate stud.

[0027] Furthermore, the bellows includes an upper bellows, a lower bellows, an upper bellows welding ring and a lower bellows welding ring, the upper bellows is located above the lower bellows, the upper bellows welding ring is located between the upper bellows and the lower bellows, the upper bellows welding ring is fixedly connected to the upper bellows and the lower bellows respectively, the lower bellows welding ring is located at the bottom end of the lower bellows, and the lower bellows welding ring is fixedly connected to the lower bellows.

[0028] Furthermore, the vacuum regulating valve also includes a valve body sealing gasket, which is located between the bracket and the valve body, and the valve body sealing gasket is respectively engaged with the bracket and the valve body.

[0029] Furthermore, the vacuum regulating valve also includes a leak detection hole, which is located at the upper part of the stuffing box and is connected to the channel of the stuffing box.

[0030] The beneficial technical effects of the present invention are:

[0031] 1. A ceramic valve core vacuum regulating valve provided by the present invention adopts a ceramic valve core and a bellows sealing structure. Under the drive of an electric actuator, the flow area between the valve core and the valve seat is changed to adjust the flow rate of gaseous uranium hexafluoride medium in a uranium enrichment process system so that the gas pressure after the regulating valve remains constant.

[0032] 2. A ceramic valve core vacuum regulating valve provided by the present invention is designed with a wear-resistant engineering ceramic valve core and valve seat structure, which has the advantages of small leakage of a single-seat valve, simple flow path and small flow resistance.

[0033] 3. The valve designed in the present invention has a low-in and high-out flow direction, and materials will not accumulate at the valve seat, which has a self-cleaning effect. The valve can be used in the uranium enrichment system for medium purification, purging and filling, and effectively solves the problem of uranium hexafluoride medium condensing on the valve seat as the temperature and pressure change.

[0034] 4. The ceramic valve core vacuum regulating valve provided by the present invention realizes the sealed connection between the valve stem and the valve core through the threaded connection between the valve stem connecting sleeve and the valve core locking nut; and realizes the sealed connection between the valve seat and the valve body through the threaded connection between the valve seat locking nut and the valve seat. A valve seat cushion made of graphite is installed between the ceramic valve seat and the valve body. During the valve closing process, the gap between the ceramic valve core and the ceramic valve seat can be adaptively adjusted, thereby improving the sealing performance when the valve is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram of a ceramic valve core vacuum regulating valve provided by the present invention;

[0036] Figure 2 A partial enlarged view of a valve seat and a valve body connecting sleeve structure of a ceramic valve core vacuum regulating valve provided by the present invention;

[0037] Figure 3 A partial enlarged view of a valve seat and a valve body connection structure of a ceramic valve core vacuum regulating valve provided by the present invention;

[0038] In the figure: 1-valve body; 2-valve seat cushion; 3-valve seat; 4-valve core lower cushion; 5-valve core upper cushion; 6-metal anti-friction ring; 7-bellows lower welding ring; 8-lower bellows; 9-valve body nut; 10-valve body stud; 11-valve stem; 12-bellows upper welding ring; 13-upper bellows; 14-stuffing box; 15-disc spring; 16-disc spring pressure plate; 17-pressure plate nut; 18-actuator; 19-adjusting pad; 20-packing pressure cylinder; 21-pressure plate stud; 22-leak detection hole; 23-packing; 24-bracket; 25-valve body sealing gasket; 26-valve core locking nut; 27-valve stem connecting sleeve; 28-valve core; 29-valve seat locking nut; 30-ceramic pressure pad anti-friction ring; 31-ceramic pressure pad. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0040] like Figure 1As shown, the present invention provides a ceramic valve core vacuum regulating valve, comprising: a valve body 1, a valve seat cushion 2, a valve seat 3, a valve core lower cushion 4, a valve core upper cushion 5, a metal anti-friction ring 6, a valve body nut 9, a valve body stud 10, a valve stem 11, a disc spring 15, a disc spring pressure plate 16, a pressure plate nut 17, an actuator 18, an adjustment pad 19, a pressure plate stud 21, a leak detection hole 22, a bracket 24, a valve body sealing gasket 25, a valve core locking nut 26, a valve stem connecting sleeve 27, a valve core 28, a valve seat locking nut 29, a ceramic pressure pad anti-friction ring 30, a ceramic pressure pad 31, a bellows and a packing device; wherein the bellows comprises an upper bellows 13, a lower bellows 8, a bellows upper welding ring 12 and a bellows lower welding ring 7, and the packing device comprises a stuffing box 14, a stuffing pressure cylinder 20 and a stuffing 23.

[0041] like Figure 1 As shown, the valve seat 3 is made of engineering ceramic material, the valve seat 3 is located in the lower recess of the valve body 1, and the valve seat 3 and the valve body 1 are fixedly connected by the threaded cooperation of the valve seat locking nut 29 and the valve body 1; the valve core 28 is made of engineering ceramic material, the valve core 28 is located in the internal through hole of the valve seat 3, and the bottom step of the valve core 28 and the top of the through hole of the valve seat 3 fit together to achieve sealing when the valve is closed; the longitudinal section of the bracket 24 is I-shaped, the bracket 24 is located above the valve body 1, and the bracket 24 and the valve body 1 are fastened together by the threaded cooperation of the valve body nut 9 and the valve body stud 10. The actuator 18 is located above the bracket 24, the valve stem 11 is located in the internal through hole of the bracket 24, the top of the valve stem 11 extends into the actuator 18, the top of the valve stem 11 is fixedly connected to the actuator 18 by threads, the bottom of the valve stem 11 extends into the matching hole of the valve core 28, and the bottom of the valve stem 11 is fixedly connected to the valve core 28 by the thread matching of the valve core locking nut 26 and the valve stem connecting sleeve 27. The bellows and the packing device are sequentially sleeved on the valve stem 11 from bottom to top, the bellows is located in the internal through hole of the bracket 24, the packing device is located above the bellows, the packing device is fixedly connected to the bracket 24 by welding, and the top of the bellows is fixedly connected to the packing device by welding.

[0042] like Figure 1 As shown, the packing device includes a stuffing box 14, a stuffing cylinder 20, and a stuffing 23. The stuffing 23 is arranged in a stuffing groove formed between the stuffing box 14 and the valve stem 11. The stuffing cylinder 20 is sleeved on the valve stem 11. The stuffing cylinder 20 is located above the stuffing box 14. The bottom of the stuffing cylinder 20 is located in the stuffing groove of the stuffing box 14, so that the stuffing cylinder 20 can be inserted into the stuffing box 14 to compress the stuffing 23 and realize the sealing between the stuffing 23 and the valve stem 11.

[0043] The disc spring 15 is sleeved on the packing pressure cylinder 20 and is located on the boss of the packing pressure cylinder 20. The disc spring pressure plate 16 is sleeved on the top of the packing pressure cylinder 20 and is located above the disc spring 15. The adjustment pad 19 is sleeved on the packing pressure cylinder 20 and is located at the bottom of the disc spring 15. The disc spring 15 is respectively connected with the adjustment pad 19 and the disc spring pressure plate 16; the adjustment pad 19 is respectively connected with the disc spring 15 and the boss of the packing pressure cylinder 20. By adding a suitable number of adjustment pads 19, it is ensured that the upper edge of the disc spring pressure plate 16 is flush with the upper edge of the packing pressure cylinder 20. The disc spring pressure plate 16 and the bracket 24 are fastened together by the threaded matching connection of the pressure plate nut 17 and the pressure plate stud 21.

[0044] like Figure 1 As shown, the bellows includes an upper bellows 13, a lower bellows 8, an upper bellows welding ring 12 and a lower bellows welding ring 7. The upper bellows 13 is located above the lower bellows 8, the upper bellows welding ring 12 is located between the upper bellows 13 and the lower bellows 8, the lower bellows welding ring 7 is located at the bottom end of the lower bellows 8, the bottom end of the upper bellows 13 is connected to the upper bellows welding ring 12 by welding, the top end of the lower bellows 8 is connected to the upper bellows welding ring 12 by welding, and the bottom end of the lower bellows 8 is connected to the lower bellows welding ring 7 by welding.

[0045] like Figure 1 As shown, a valve body sealing gasket 25 is provided between the bracket 24 and the valve body 1 , and the valve body sealing gasket 25 is respectively engaged and connected with the bracket 24 and the valve body 1 to achieve sealing between the bracket 24 and the valve body 1 .

[0046] like Figure 1 As shown, a leak detection hole 22 is provided at the upper portion of the stuffing box 14 , and the leak detection hole 22 is connected to the passage of the stuffing box 14 . Through the passage of the stuffing box 14 , it is possible to detect whether the bellows is broken at the leak detection hole 22 .

[0047] like Figure 2 As shown, the valve core 28 is made of engineering ceramic material, which is not convenient to connect with other parts through threads. A boss is provided on the upper part of the valve core 28 along the outer circumference, and a lower connecting surface matching the boss of the valve core 28 is provided at the bottom end of the valve stem connecting sleeve 27. The valve core 28 is installed in the valve stem connecting sleeve 27 through the boss structure of the ceramic valve core 28 matching the lower connecting surface of the valve stem connecting sleeve 27, so that the ceramic valve core 28 will not fall off.

[0048] The bottom end of the valve stem 11 is located in the matching hole of the valve core 28. A boss is provided along the outer circumference of the bottom of the valve stem 11. The boss at the bottom of the valve stem 11 is located on the top surface of the valve core 28. The bottom end of the valve stem 11 is inserted into the matching hole of the valve core 28 through the matching of the boss structure at the bottom of the valve stem 11 and the matching hole of the valve core 28.

[0049] A valve core lower buffer pad 4 is provided between the boss at the bottom of the valve stem 11 and the valve core 28 , and the valve core lower buffer pad 4 is respectively connected to the bottom surface of the boss at the bottom of the valve stem 11 and the top surface of the valve core 28 to achieve sealing between the valve stem 11 and the valve core 28 .

[0050] The valve core locking nut 26 is sleeved on the valve stem 11 and is located in the upper connecting hole of the valve stem connecting sleeve 27. The outer side of the valve core locking nut 26 is provided with an external thread, and the inner side of the upper connecting hole of the valve stem connecting sleeve 27 is provided with an internal thread. The valve core locking nut 26 with the external thread is fastened with the valve stem connecting sleeve 27 with the internal thread through threads, and the valve core locking nut 26 is screwed into the valve stem connecting sleeve 27.

[0051] A valve core upper buffer pad 5 and a metal anti-friction ring 6 are arranged in sequence from bottom to top between the valve core locking nut 26 and the boss at the bottom of the valve stem 11. The valve core upper buffer pad 5 and the metal anti-friction ring 6 are both sleeved on the valve stem 11. The metal anti-friction ring 6 is respectively engaged and connected with the valve core locking nut 26 and the valve core upper buffer pad 5. The valve core upper buffer pad 5 is respectively engaged and connected with the metal anti-friction ring 6 and the boss at the bottom of the valve stem 11. The connection between the valve stem 11 and the ceramic valve core 28 is achieved by screwing the valve core locking nut 26 into the valve stem connecting sleeve 27. During the rotation of the valve core locking nut 26, the valve core locking nut 26 directly contacts the metal anti-friction ring 6, and force is applied to the graphite buffer pad 5 through the metal anti-friction ring 6, thereby avoiding wear on the graphite buffer pad 5.

[0052] Since there are gaps between the ceramic valve core 28 and the valve stem connecting sleeve 27, and between the ceramic valve core 28 and the valve stem 11, and since the valve core lower buffer pad 4 and the valve core upper buffer pad 5 are made of graphite material and have a certain degree of deformability, the valve core can adaptively adjust the close fit between the valve stem connecting sleeve 27 and the valve stem 11 during the valve closing process, thereby improving the sealing performance of the valve when it is closed.

[0053] like Figure 3 As shown, the valve seat 3 is made of engineering ceramic material, which is not convenient to connect with other parts through threads. The valve seat 3 is located on the valve body 1, and a boss is provided along the outer circumference of the upper part of the valve seat 3, and a boss protruding inward is provided in the lower recess of the valve body 1, and the boss on the lower recess of the valve body 1 cooperates with the boss of the valve seat 3; the bottom of the valve core 28 is located in the internal through hole of the valve seat 3, and the bottom of the valve core 28 is provided with a step along the outer circumference, and the bottom step of the valve core 28 is engaged and connected with the top end of the through hole of the valve seat 3.

[0054] A valve seat cushion 2 is provided between the valve seat 3 and the valve body 1 , and the valve seat cushion 2 is respectively joined and connected to the valve seat 3 and the valve body 1 to achieve sealing between the valve seat 3 and the valve body 1 .

[0055] A ceramic pressure pad 31 is provided on the valve seat 3, and the ceramic pressure pad 31 is sleeved on the valve core 28. A boss is provided on the bottom of the ceramic pressure pad 31 along the outer circumference. The valve seat locking nut 29 is located on the boss of the ceramic pressure pad 31 and sleeved on the ceramic pressure pad 31. An external thread is provided on the outer side of the valve seat locking nut 29, and an internal thread is provided on the valve body 1 corresponding to the position of the valve seat locking nut 29. The valve seat locking nut 29 with an external thread is fastened to the valve seat 1 with an internal thread through threads.

[0056] A ceramic pressure pad wear reducing ring 30 is provided between the valve seat locking nut 29 and the ceramic pressure pad 31 , and the ceramic pressure pad wear reducing ring 30 is respectively connected with the valve seat locking nut 29 and the ceramic pressure pad 31 .

[0057] Installing a ceramic pressure pad 31 on the ceramic valve seat 3 can effectively prevent the ceramic valve core 28 and the ceramic valve seat 3 from being eroded by the medium due to the high flow rate between the ceramic valve core 28 and the ceramic valve seat 3. Install a ceramic pressure pad anti-friction ring 30 on the ceramic pressure pad 31, and then screw in the valve seat locking nut 29, so that the ceramic valve seat 3 is pressed by the threaded fit between the valve body 1 and the valve seat locking nut 29.

[0058] A valve seat cushion 2 made of graphite is installed between the ceramic valve seat 3 and the valve body 1. Due to the elasticity of the valve seat cushion 2 made of graphite, the valve can adaptively adjust the fit between the ceramic valve core 28 and the ceramic valve seat 3 during the closing process, thereby improving the sealing performance of the valve when it is closed.

[0059] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A ceramic valve core vacuum regulating valve, characterized in that: The vacuum regulating valve comprises: a valve body (1), a valve seat (3), a valve stem (11), a disc spring (15), a disc spring pressure plate (16), an actuator (18), a bracket (24), a valve core (28), a bellows and a packing device; the valve seat (3) and the valve core (28) are made of ceramic material; the valve seat (3) is located inside the valve body (1), and the valve seat (3) is fixedly connected to the valve body (1); the valve core (28) is located inside the valve seat (3), and the valve core (28) is engaged with the valve seat (3); the bracket (24) is located above the valve body (1), and the bracket (24) is fixedly connected to the valve body (1); the actuator (18) is located above the bracket (24), the valve stem (11) is located inside the bracket (24), and the top of the valve stem (11) extends to the actuator (18) ), the top of the valve stem (11) is fixedly connected to the actuator (18), the bottom of the valve stem (11) extends to the inside of the valve core (28), and the bottom of the valve stem (11) is fixedly connected to the valve core (28); the bellows and the packing device are sequentially sleeved on the valve stem (11) from bottom to top, the bellows is located inside the bracket (24), the packing device is located above the bellows, the packing device is fixedly connected to the bracket (24), and the bellows is fixedly connected to the packing device; the disc spring (15) is sleeved on the packing device, the disc spring pressure plate (16) is sleeved on the top of the packing device and is located above the disc spring (15), the disc spring (15) is respectively engaged with the packing device and the disc spring pressure plate (16), and the disc spring pressure plate (16) is fixedly connected to the bracket (24); The vacuum regulating valve further comprises a valve core locking nut (26) and a valve stem connecting sleeve (27), wherein the bottom of the valve stem (11) and the valve core (28) are fixedly connected via threads of the valve core locking nut (26) and the valve stem connecting sleeve (27); The upper part of the valve core (28) is provided with a boss along the outer circumference, and the bottom end of the valve stem connecting sleeve (27) is provided with a lower connecting surface that matches the boss of the valve core (28). The valve core (28) is installed in the valve stem connecting sleeve (27) by matching the boss structure of the ceramic valve core (28) with the lower connecting surface of the valve stem connecting sleeve (27); the bottom end of the valve stem (11) is located in the internal matching hole of the valve core (28), and the bottom of the valve stem (11) is provided with a boss along the outer circumference. The boss at the bottom of the valve stem (11) is located on the top surface of the valve core (28), and the bottom end of the valve stem (11) is inserted into the matching hole of the valve core (28) through the matching of the boss structure at the bottom of the valve stem (11) and the matching hole of the valve core (28); the valve core locking nut (26) is sleeved on the valve stem (11) and is located in the upper connecting hole of the valve stem connecting sleeve (27), and the valve core locking nut (26) and the valve stem connecting sleeve (27) are fixedly connected by thread matching; The vacuum regulating valve further comprises a valve seat locking nut (29), and the valve seat (3) and the valve body (1) are fixedly connected via the threaded fit between the valve seat locking nut (29) and the valve body (1); The upper part of the valve seat (3) is provided with a boss along the outer circumference, and the lower recess of the valve body (1) is provided with a boss protruding inwardly, and the boss on the lower recess of the valve body (1) matches with the boss of the valve seat (3); the bottom of the valve core (28) is located in the internal through hole of the valve seat (3), and the bottom of the valve core (28) is provided with a step along the outer circumference, and the bottom step of the valve core (28) is engaged and connected with the top end of the through hole of the valve seat (3); the valve seat locking nut (29) is sleeved on the valve core (28), the valve seat locking nut (29) is located on the valve seat (3), the valve seat locking nut (29) and the valve seat (3) are fixedly connected by threads, and the bottom end of the valve seat locking nut (29) is pressed against the valve seat (3); The bellows comprises an upper bellows (13), a lower bellows (8), an upper bellows welding ring (12) and a lower bellows welding ring (7); the upper bellows (13) is located above the lower bellows (8); the upper bellows welding ring (12) is located between the upper bellows (13) and the lower bellows (8); the upper bellows welding ring (12) is fixedly connected to the upper bellows (13) and the lower bellows (8) respectively; the lower bellows welding ring (7) is located at the bottom end of the lower bellows (8); and the lower bellows welding ring (7) is fixedly connected to the lower bellows (8).

2. A ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a valve core upper buffer pad (5) and a metal anti-friction ring (6), the valve core upper buffer pad (5) and the metal anti-friction ring (6) being sleeved on the valve stem (11) in sequence from bottom to top, the valve core upper buffer pad (5) and the metal anti-friction ring (6) being located between the valve core locking nut (26) and a boss at the bottom of the valve stem (11), the metal anti-friction ring (6) being respectively engaged with the valve core locking nut (26) and the valve core upper buffer pad (5), and the valve core upper buffer pad (5) being respectively engaged with the metal anti-friction ring (6) and the boss at the bottom of the valve stem (11).

3. A ceramic valve core vacuum regulating valve according to claim 2, characterized in that: The vacuum regulating valve further comprises a valve core lower cushion (4), the valve core lower cushion (4) being located between the boss at the bottom of the valve stem (11) and the valve core (28), and the valve core lower cushion (4) being respectively engaged with the boss at the bottom of the valve stem (11) and the valve core (28).

4. A ceramic valve core vacuum regulating valve according to claim 3, characterized in that: The valve core lower buffer pad (4) and the valve core upper buffer pad (5) are both made of graphite.

5. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a ceramic pressure pad (31), which is sleeved on the inner side of the valve seat locking nut (29) and is located between the valve seat (3) and the valve seat locking nut (29). The ceramic pressure pad (31) is respectively engaged and connected with the valve seat (3) and the valve seat locking nut (29).

6. A ceramic valve core vacuum regulating valve according to claim 5, characterized in that: The bottom of the ceramic pressure pad (31) is provided with a boss along the outer circumference, the valve seat locking nut (29) is located on the boss of the ceramic pressure pad (31), and the bottom end of the valve seat locking nut (29) is tightly pressed against the boss of the ceramic pressure pad (31).

7. A ceramic valve core vacuum regulating valve according to claim 6, characterized in that: The vacuum regulating valve further comprises a ceramic pressure pad wear-reducing ring (30), which is located between the valve seat locking nut (29) and the boss of the ceramic pressure pad (31), and the ceramic pressure pad wear-reducing ring (30) is respectively engaged and connected with the valve seat locking nut (29) and the boss of the ceramic pressure pad (31).

8. The ceramic valve core vacuum regulating valve according to claim 7, characterized in that: The vacuum regulating valve further comprises a valve seat cushion (2), the valve seat cushion (2) being located between the valve seat (3) and the valve body (1), and the valve seat cushion (2) being respectively joined and connected to the valve seat (3) and the valve body (1).

9. A ceramic valve core vacuum regulating valve according to claim 8, characterized in that: The valve seat cushion (2) is made of graphite.

10. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a valve body nut (9) and a valve body stud (10), and the bracket (24) and the valve body (1) are fixedly connected through the threaded fit of the valve body nut (9) and the valve body stud (10).

11. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The packing device comprises a packing box (14), a packing pressure cylinder (20), and a packing (23); the packing (23) is arranged in a packing groove formed between the packing box (14) and the valve stem (11); the packing pressure cylinder (20) is sleeved on the valve stem (11); the packing pressure cylinder (20) is located above the packing box (14); and the bottom of the packing pressure cylinder (20) is located in the packing groove of the packing box (14).

12. A ceramic valve core vacuum regulating valve according to claim 11, characterized in that: The disc spring (15) is located on a boss of the packing pressure cylinder (20), and the disc spring (15) is respectively engaged and connected with the packing pressure cylinder (20) and the disc spring pressure plate (16).

13. A ceramic valve core vacuum regulating valve according to claim 12, characterized in that: The vacuum regulating valve further comprises an adjusting pad (19), which is sleeved on the packing pressure cylinder (20) and is located at the bottom of the disc spring (15). The adjusting pad (19) is respectively engaged and connected with the disc spring (15) and the packing pressure cylinder (20).

14. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a pressure plate nut (17) and a pressure plate stud (21), and the disc spring pressure plate (16) and the bracket (24) are fixedly connected via the threaded fit of the pressure plate nut (17) and the pressure plate stud (21).

15. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a valve body sealing gasket (25), the valve body sealing gasket (25) being located between the bracket (24) and the valve body (1), and the valve body sealing gasket (25) being respectively joined and connected to the bracket (24) and the valve body (1).

16. The ceramic valve core vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve further comprises a leak detection hole (22), wherein the leak detection hole (22) is located at the upper part of the stuffing box (14) and is connected to a channel of the stuffing box (14).

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