A vacuum bellows ball valve for high temperature and high pressure fluid

Abstract

The present invention relates to the technical field of ball valves, and in particular to a high-temperature and high-pressure fluid vacuum bellows ball valve. A high-temperature and high-pressure fluid vacuum bellows ball valve comprises a blocking mechanism and a sealing mechanism, wherein the blocking mechanism comprises a valve stem, and the sealing mechanism comprises a second sealing assembly, and the second sealing assembly comprises a sealing tube. A first sealing ring is arranged on the inner wall of the sealing tube, and a second sealing ring is arranged on the outer wall of the sealing tube. When the valve stem moves up and down, the sealing tube is driven to rotate by a preset angle through an adjusting unit, thereby changing the contact portion of the first sealing ring, the second sealing ring and the inner wall of the second channel near one end of the first channel, so that the circumferential wear of the first sealing ring and the second sealing ring is more uniform. The present invention provides a high-temperature and high-pressure fluid vacuum bellows ball valve to solve the problems of poor sealing effect of the existing ball valve, and unbalanced force on both sides of the valve core during the operation of the valve, which often leads to uneven wear of the packing sealing mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a high-temperature and high-pressure fluid vacuum bellows ball valve. Background Art

[0002] A ball valve is a valve with a round sphere as the opening and closing part. It is opened and closed by rotating 90 degrees around the axis of the valve stem. The working principle of the ball valve is relatively simple but very efficient. The valve stem drives the ball to rotate. When the ball rotates to the fully open position, the fluid can pass freely; when it rotates to the fully closed position, the fluid is cut off. With the development of modern industry, the requirements for the accuracy, reliability and safety of fluid control are constantly increasing. In some vacuum systems or process flows with extremely high leakage requirements, traditional ball valves are difficult to meet the requirements. Bellows sealing technology provides a better solution for the sealing of ball valves. The bellows is fixedly connected to the valve stem, connecting shaft, etc., the variable seal is a static seal, and it is often combined with the packing seal to form a double seal, which greatly improves the sealing reliability, effectively prevents the leakage of the medium, and meets the use requirements of occasions such as pipeline vacuum.

[0003] The track ball valves (forced sealing ball valves) commonly seen on the market all adopt a single valve seat structure. The forced extrusion force when the valve stem is closed acts on the valve seat to achieve the valve sealing effect. Track ball valves are used in some flammable, explosive, highly corrosive, and high-temperature working conditions. Since the valve core is often in an unbalanced force state on both sides during the operation of the valve, the valve stem itself will be subjected to a torque, which often causes uneven wear of the packing seal mechanism.

[0004] For example, the patent with announcement number CN116201921B provides a leak-proof bellows track ball valve, which has a split structure of an upper valve stem and a lower valve stem, and the upper valve stem can be continuously pressed down, so that the arc surface of the ball is tightly pressed laterally in the sealing ring, and the closing sealing quality of the ball is improved while ensuring that the valve stem does not deviate. However, if the sealing is only performed through the bellows, the sealing effect is poor, the internal liquid is easy to leak, and the external gas is easy to enter, thereby corroding the valve stem. Summary of the invention

[0005] The present invention provides a high-temperature and high-pressure fluid vacuum bellows ball valve to solve the problems of poor sealing effect of the existing ball valve and unbalanced force on both sides of the valve core during operation, which often leads to uneven wear of the packing sealing mechanism.

[0006] A high-temperature and high-pressure fluid vacuum bellows ball valve of the present invention adopts the following technical scheme: A high-temperature and high-pressure fluid vacuum bellows ball valve includes a valve seat, a blocking mechanism and a sealing mechanism. The blocking mechanism includes a ball, a valve stem and a transmission assembly. A first channel arranged in the horizontal direction and a second channel arranged in the vertical direction are provided in the valve seat. The first channel and the second channel are connected, and a ball groove is provided at the connection between the first channel and the second channel. The ball is rotatably arranged in the ball groove, and a third channel arranged in the horizontal direction is provided on the ball. The ball has a first state and a second state. The first state of the ball is that the third channel is connected to the first channel, and the second state of the ball is that the third channel is not connected to the first channel. The valve stem is vertically arranged, and the valve stem is slidably arranged in the second channel. The valve stem moves upward to drive the ball from the first state to the second state through the transmission assembly.

[0007] The sealing mechanism includes a first sealing assembly and a second sealing assembly, which are sequentially arranged from bottom to top. The first sealing assembly includes a first bellows, which is coaxially arranged with the valve stem and arranged outside the valve stem, and the first bellows connects the valve stem and the valve seat.

[0008] The second sealing assembly includes a sealing tube and an adjusting unit. The sealing tube and the valve stem are coaxially arranged, and the sealing tube is rotatably sleeved on the outside of the valve stem. A first sealing ring is fixedly arranged on the inner wall of the sealing tube, and a second sealing ring is fixedly arranged on the outer wall of the sealing tube. The first sealing ring and the second sealing ring are both coaxially arranged with the sealing tube, the first sealing ring abuts against the valve stem, and the second sealing ring abuts against the valve seat. When the valve stem moves up and down, the sealing tube is driven to rotate by a preset angle through the adjusting unit.

[0009] Furthermore, a plurality of slide slot assemblies are provided in the middle of the outer peripheral wall of the valve stem, and the plurality of slide slot assemblies are sequentially distributed along the circumference of the valve stem. Each slide slot assembly includes a first inclined slot and a second inclined slot. From top to bottom, the lower ends of the first inclined slot and the second inclined slot gradually approach each other.

[0010] A plurality of first slide grooves are provided on the inner circumferential wall of the sealing tube, and the plurality of first slide grooves are sequentially distributed along the circumference of the sealing tube, and each first slide groove is arranged along the radial direction of the sealing tube. The adjustment unit includes a plurality of sliding rods and a plurality of springs. The sliding rods are arranged along the radial direction of the sealing tube, and one end of the sliding rods is slidably arranged in the first slide grooves. The other end of the sliding rods is slidably arranged in the first inclined groove or the second inclined groove. The spring connects the sliding rod and the sealing tube.

[0011] Further, the bottom of each first inclined groove includes a first plane, a first inclined surface and a second plane, and the first plane, the first inclined surface and the second plane are sequentially distributed from top to bottom. And from top to bottom, the first inclined surface gradually moves away from the axis of the valve stem. The distance between the second plane and the axis of the valve stem is greater than the distance between the first plane and the axis of the valve stem.

[0012] The bottom of each second inclined groove includes a third plane, a second inclined plane and a fourth plane, and the third plane, the second inclined plane and the fourth plane are distributed in sequence from top to bottom. Along the direction from top to bottom, the second inclined plane gradually approaches the axis of the valve stem, and the distance between the third plane and the axis of the valve stem is greater than the distance between the fourth plane and the axis of the valve stem. The distance between the third plane and the axis of the valve stem is greater than the distance between the first plane and the axis of the valve stem. The distance between the second plane and the axis of the valve stem is greater than the distance between the fourth plane and the axis of the valve stem.

[0013] Furthermore, a plurality of second slide grooves are provided on the lower part of the peripheral wall of the valve stem, and the plurality of second slide grooves are sequentially distributed along the circumference of the valve stem. Each second slide groove is spiral, and the pitch of the second slide groove gradually increases from top to bottom. The transmission assembly includes a rotating rod, which is vertically arranged, and the rotating rod is arranged on the sphere and rotates synchronously with the sphere. The upper end of the rotating rod is in the second channel, and a first mounting groove is provided on the upper end of the rotating rod, and the first mounting groove is vertically arranged, and the lower end of the valve stem is slidably arranged in the first mounting groove. A plurality of protrusions are arranged in the first mounting groove, and the protrusions are slidably arranged in the second slide groove.

[0014] Furthermore, a square groove is provided on the sphere, and the square groove is arranged vertically. A square rod is fixedly arranged at the lower end of the rotating rod, and the square rod is arranged vertically and arranged in the square groove.

[0015] Furthermore, a first limiting ring is fixedly provided on the rotating rod, the first limiting ring and the rotating rod are coaxially provided, the first limiting ring is provided at the connection between the ball groove and the second channel, and the first limiting ring is used to abut against the valve seat.

[0016] Furthermore, the sealing mechanism further comprises a third sealing assembly, the third sealing assembly comprises a second bellows, the second bellows is vertically arranged, the second bellows is arranged outside the valve stem, and the second bellows is located at the upper part of the valve stem. The second bellows connects the valve stem and the valve seat.

[0017] Furthermore, a rack is fixedly provided at the upper end of the valve stem, and the rack is vertically provided. The horizontal direction where the first channel is located is the first direction. The blocking mechanism also includes a driving assembly, and the driving assembly includes a rotating wheel, a rotating shaft and a gear. The rotating shaft is arranged along a second direction, the second direction is a horizontal direction, and the second direction is perpendicular to the first direction. The rotating shaft is rotatably provided on the valve seat. The rotating wheel and the gear are respectively fixedly provided at both ends of the rotating shaft, and the gear and the rack are meshed.

[0018] Further, the first channel includes a first connecting pipe and a second connecting pipe, and the first connecting pipe and the second connecting pipe are respectively located at both sides of the ball groove along the first direction. The third channel is provided with a first rubber ring and a second rubber ring at both ends, the first rubber ring is located at the connection between the ball groove and the first connecting pipe, and the second rubber ring is located at the connection between the ball groove and the second connecting pipe.

[0019] Further, the valve stem includes a connecting rod, a second limiting ring and a third limiting ring. The connecting rod is vertically arranged, and the second limiting ring and the third limiting ring are sequentially arranged from bottom to top. The first bellows connects the second limiting ring and the valve seat, and the second bellows connects the third limiting ring and the valve seat.

[0020] The beneficial effects of the present invention are as follows: the vacuum bellows ball valve for high-temperature and high-pressure fluid of the present invention provides a first layer of sealing on the valve stem by setting a first bellows to prevent water leaking into the ball groove from entering the second channel. The first sealing ring and the second sealing ring on the sealing tube provide a second layer of sealing on the valve stem to enhance the sealing performance and ensure timely sealing when a problem occurs in the sealing of the first bellows, thereby providing double protection.

[0021] During the operation of the vacuum bellows ball valve for high-temperature and high-pressure fluids, the ball is often in an unbalanced force state on both sides. The wear degree of the first sealing ring and the second sealing ring near one end of the first channel is greater than the wear degree of the first sealing ring and the second sealing ring near the other end of the first channel. When the valve stem moves up and down, the sealing tube is driven to rotate by a preset angle through the adjustment unit, thereby changing the contact portion of the first sealing ring, the second sealing ring and the inner wall of the second channel near one end of the first channel. As a result, the wear degree of the first sealing ring and the second sealing ring in the circumferential direction is more uniform, and the service life of the first sealing ring and the second sealing ring is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the structure of a high-temperature and high-pressure fluid vacuum bellows ball valve provided by an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of a high-temperature and high-pressure fluid vacuum bellows ball valve provided by an embodiment of the present invention;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 A schematic structural diagram of a valve stem of a vacuum bellows ball valve for high-temperature and high-pressure fluids provided in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 A cross-sectional view of a sealing tube of a vacuum bellows ball valve for high-temperature and high-pressure fluid provided by an embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of a rotating rod of a high-temperature and high-pressure fluid vacuum bellows ball valve provided by an embodiment of the present invention;

[0030] Figure 8 A schematic structural diagram of a high-temperature and high-pressure fluid vacuum bellows ball valve ball in a second state provided by an embodiment of the present invention.

[0031] In the figure: 100, valve seat; 110, first channel; 111, first connecting pipe; 112, second connecting pipe; 120, second channel; 130, third channel; 131, first rubber ring; 132, second rubber ring; 140, ball groove; 300, rotating wheel; 410, rotating shaft; 420, gear; 430, valve stem; 431, first inclined groove; 4311, first plane; 4312, first inclined plane; 4313, second plane; 432, second inclined groove; 4321, third plane Surface; 4322, second inclined surface; 4323, fourth plane; 433, rack; 434, second slide groove; 435, second limiting ring; 436, third limiting ring; 440, second bellows; 450, sealing tube; 451, first sealing ring; 452, second sealing ring; 453, sliding rod; 454, spring; 460, first bellows; 470, rotating rod; 471, square rod; 472, first limiting ring; 473, bump; 474, first mounting groove; 500, sphere. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Reference Figures 1 to 8As shown, a high-temperature and high-pressure fluid vacuum bellows ball valve provided by an embodiment of the present invention includes a valve seat 100, a blocking mechanism and a sealing mechanism. The blocking mechanism includes a ball 500, a valve stem 430 and a transmission assembly. A first channel 110 arranged in the horizontal direction and a second channel 120 arranged in the vertical direction are provided in the valve seat 100. The first channel 110 and the second channel 120 are connected, and a ball groove 140 is provided at the connection between the first channel 110 and the second channel 120. The ball 500 is rotatably arranged in the ball groove 140. A third channel 130 arranged in the horizontal direction is provided on the ball 500. The ball 500 has a first state and a second state. The second state of the ball 500 is that the third channel 130 is connected to the first channel 110, and the first state of the ball 500 is that the third channel 130 is not connected to the first channel 110. The valve stem 430 is vertically arranged and slidably arranged in the second channel 120 . The valve stem 430 moves upward and drives the ball 500 to change from the first state to the second state through the transmission assembly.

[0034] The sealing mechanism includes a first sealing assembly and a second sealing assembly, which are sequentially arranged from bottom to top. The first sealing assembly includes a first bellows 460, which is coaxially arranged with the valve stem 430, and the first bellows 460 is arranged outside the valve stem 430, and the first bellows 460 connects the valve stem 430 and the valve seat 100.

[0035] The second sealing assembly includes a sealing tube 450 and an adjusting unit. The sealing tube 450 and the valve stem 430 are coaxially arranged, and the sealing tube 450 is rotatably sleeved on the outer side of the valve stem 430. A first sealing ring 451 is fixedly arranged on the inner side wall of the sealing tube 450, and a second sealing ring 452 is fixedly arranged on the outer side wall of the sealing tube 450. The first sealing ring 451 and the second sealing ring 452 are both coaxially arranged with the sealing tube 450, the first sealing ring 451 and the valve stem 430 are abutted, and the second sealing ring 452 and the valve seat 100 are abutted. When the valve stem 430 moves up and down, the sealing tube 450 is driven to rotate by a preset angle through the adjusting unit.

[0036] The first bellows 460 performs a first layer of sealing on the valve stem 430 to prevent water leaking into the ball groove 140 from entering the second channel 120. The first sealing ring 451 and the second sealing ring 452 on the sealing tube 450 perform a second layer of sealing on the valve stem 430 to enhance the sealing performance and ensure that the first bellows 460 is sealed in time when there is a problem with the sealing, thereby providing double protection.

[0037] When the ball 500 is in the first state, the first channel 110 and the third channel 130 are connected, and the water flows in the direction from the first connecting pipe 111 to the second connecting pipe 112. The high-temperature and high-pressure fluid vacuum bellows ball valve is in an open state. When the high-temperature and high-pressure fluid vacuum bellows ball valve needs to be closed, the valve stem 430 moves upward and drives the ball 500 from the first state to the second state through the transmission assembly. When the high-temperature and high-pressure fluid vacuum bellows ball valve needs to be opened again, the valve stem 430 moves downward and drives the ball 500 from the second state to the first state through the transmission assembly.

[0038] During the operation of the vacuum bellows ball valve for high-temperature and high-pressure fluids, the ball 500 is often in an unbalanced force state on both sides. The wear degree of the first sealing ring 451 and the second sealing ring 452 near one end of the first channel 110 is greater than the wear degree of the first sealing ring 451 and the second sealing ring 452 near the other end of the first channel 110. When the valve stem 430 moves up and down, the sealing tube 450 is driven to rotate by a preset angle through the adjustment unit, thereby changing the contact portion of the first sealing ring 451, the second sealing ring 452 and the inner wall of the second channel 120 near one end of the first channel 110. Thereby, the wear degree of the first sealing ring 451 and the second sealing ring 452 in the circumferential direction is more uniform, and the service life of the first sealing ring 451 and the second sealing ring 452 is increased.

[0039] In this embodiment, a plurality of slide slot assemblies are provided in the middle of the outer peripheral wall of the valve stem 430, and the plurality of slide slot assemblies are sequentially distributed along the circumference of the valve stem 430. Each slide slot assembly includes a first inclined slot 431 and a second inclined slot 432. From top to bottom, the lower ends of the first inclined slot 431 and the second inclined slot 432 gradually approach each other.

[0040] A plurality of first slide grooves are provided on the inner circumferential wall of the sealing tube 450, and the plurality of first slide grooves are sequentially distributed along the circumference of the sealing tube 450, and each first slide groove is arranged along the radial direction of the sealing tube 450. The adjustment unit includes a plurality of sliding rods 453 and a plurality of springs 454. The sliding rods 453 are arranged along the radial direction of the sealing tube 450, and one end of the sliding rods 453 is slidably arranged in the first slide grooves. The other end of the sliding rods 453 is slidably arranged in the first inclined groove 431 or the second inclined groove 432. The spring 454 connects the sliding rods 453 and the sealing tube 450.

[0041] In this embodiment, the bottom of each first inclined groove 431 includes a first plane 4311, a first inclined surface 4312, and a second plane 4313, and the first plane 4311, the first inclined surface 4312, and the second plane 4313 are sequentially distributed from top to bottom. And from top to bottom, the first inclined surface 4312 gradually moves away from the axis of the valve stem 430. The distance between the second plane 4313 and the axis of the valve stem 430 is greater than the distance between the first plane 4311 and the axis of the valve stem 430. The second plane 4313 is triangular, and the base of the triangle of the second plane 4313 is connected to the first inclined surface 4312.

[0042] The bottom of each second inclined groove 432 includes a third plane 4321, a second inclined surface 4322 and a fourth plane 4323, which are arranged in sequence from top to bottom. The third plane 4321 is triangular, and the base of the triangle of the third plane 4321 is connected to the second inclined surface 4322. From top to bottom, the second inclined surface 4322 gradually approaches the axis of the valve stem 430, and the distance between the third plane 4321 and the axis of the valve stem 430 is greater than the distance between the fourth plane 4323 and the axis of the valve stem 430. The distance between the third plane 4321 and the axis of the valve stem 430 is greater than the distance between the first plane 4311 and the axis of the valve stem 430. The distance between the second plane 4313 and the axis of the valve stem 430 is greater than the distance between the fourth plane 4323 and the axis of the valve stem 430.

[0043] When the valve stem 430 moves upward, the sliding rod 453 on the sealing tube 450 moves downward relative to the valve stem 430, and the sliding rod 453 passes through the first inclined groove 431 and then arrives in the second plane 4313. The sliding rod 453 rotates positively by a preset angle when moving in the first inclined groove 431. Then, under the guidance of the second plane 4313 of the first inclined groove 431, and the distance between the second plane 4313 and the axis of the valve stem 430 is greater than the distance between the fourth plane 4323 and the axis of the valve stem 430, the sliding rod 453 falls into the fourth plane 4323 of the second inclined groove 432.

[0044] Then, when the valve stem 430 moves downward, the sliding rod 453 passes through the second inclined surface 4322 from the fourth plane 4323 to the third plane 4321, and the sliding rod 453 rotates positively by a preset angle when moving in the second inclined groove 432. Thereafter, under the guidance of the third plane 4321 of the second inclined groove 432, and the distance between the third plane 4321 and the axis of the valve stem 430 is greater than the distance between the first plane 4311 and the axis of the valve stem 430, the sliding rod 453 falls into the first plane 4311 of the first inclined groove 431.

[0045] In this embodiment, a plurality of second slide grooves 434 are provided on the lower portion of the peripheral wall of the valve stem 430, and the plurality of second slide grooves 434 are sequentially distributed along the circumference of the valve stem 430. Each second slide groove 434 is spiral, and along the direction from top to bottom, the pitch of the second slide groove 434 gradually increases, and the distance between two adjacent second slide grooves 434 gradually increases.

[0046] The transmission assembly includes a rotating rod 470, which is vertically arranged, and is arranged on the ball 500, and rotates synchronously with the ball 500. The upper end of the rotating rod 470 is in the second channel 120, and a first mounting groove 474 is provided on the upper end of the rotating rod 470, and the first mounting groove 474 is vertically arranged, and the lower end of the valve stem 430 is slidably arranged in the first mounting groove 474. A plurality of protrusions 473 are arranged in the first mounting groove 474, and the protrusions 473 are slidably arranged in the second slide groove 434.

[0047] When the valve stem 430 moves upward and needs to close the high-temperature and high-pressure fluid vacuum bellows ball valve, since the rotation resistance of the closing ball 500 is initially large and then small when it rotates, the pitch of the lower part of the second slide 434 is large, and the valve stem 430 moves upward for a long distance and rotates at a small angle. The pitch of the upper part of the second slide 434 is small, and the valve stem 430 moves upward for a short distance and rotates at a large angle. The valve stem 430 rotates slowly in the more strenuous part to prevent the large torsional force from damaging the valve stem 430. The valve stem 430 rotates quickly in the less strenuous part, so that the switching between the first state and the second state of the ball 500 is completed quickly, improving work efficiency. It can also make the overall force of the valve stem 430 more uniform and the movement more stable.

[0048] When the valve stem 430 moves downward and needs to open the high-temperature and high-pressure fluid vacuum bellows ball valve, the rotation resistance of the opening ball 500 is initially small and then becomes larger when it rotates. Therefore, the pitch of the upper part of the second slide groove 434 is small, and the valve stem 430 moves downward for a short distance and rotates at a larger angle. The pitch of the lower part of the second slide groove 434 is large, and the valve stem 430 moves downward for a long distance and rotates at a lower angle, so that during the opening and closing process, the valve stem 430 is more evenly stressed and moves more smoothly.

[0049] In this embodiment, a square groove is formed on the sphere 500, and the square groove is vertically arranged. A square rod 471 is fixedly arranged at the lower end of the rotating rod 470, and the square rod 471 is vertically arranged and arranged in the square groove.

[0050] In this embodiment, a first limiting ring 472 is fixedly disposed on the rotating rod 470. The first limiting ring 472 and the rotating rod 470 are coaxially disposed. The first limiting ring 472 is disposed at the connection between the ball groove 140 and the second channel 120. The first limiting ring 472 is used to abut against the valve seat 100. The first limiting ring 472 limits the rotating rod 470 and blocks the gap between the rotating rod 470 and the second channel 120.

[0051] In this embodiment, the sealing mechanism further includes a third sealing assembly, which includes a second bellows 440, which is vertically arranged, arranged outside the valve stem 430, and located at the upper part of the valve stem 430. The second bellows 440 connects the valve stem 430 and the valve seat 100. The second bellows 440 performs a third layer of sealing on the valve stem 430, isolating it from the external environment, and preventing the internal components of the valve stem 430 from oxidation and rust.

[0052] In this embodiment, a rack 433 is fixedly provided at the upper end of the valve stem 430, and the rack 433 is vertically arranged. The horizontal direction in which the first channel 110 is located is the first direction. The blocking mechanism also includes a driving assembly, and the driving assembly includes a rotating wheel 300, a rotating shaft 410 and a gear 420. The rotating shaft 410 is arranged along a second direction, the second direction is a horizontal direction, and the second direction is perpendicular to the first direction. The rotating shaft 410 is rotatably arranged on the valve seat 100. The rotating wheel 300 and the gear 420 are respectively fixedly arranged at both ends of the rotating shaft 410, and the gear 420 and the rack 433 are meshed. When the rotating wheel 300 is rotated in the forward direction, the rotating wheel 300 drives the rotating shaft 410 to rotate. When the rotating shaft 410 rotates, the gear 420 drives the rack 433 to move upward, thereby causing the valve stem 430 to move upward.

[0053] In this embodiment, the first channel 110 includes a first connecting pipe 111 and a second connecting pipe 112, and the first connecting pipe 111 and the second connecting pipe 112 are respectively located at both sides of the ball groove 140 along the first direction. The third channel 130 is provided with a first rubber ring 131 and a second rubber ring 132 at both ends, and the first rubber ring 131 is located at the connection between the ball groove 140 and the first connecting pipe 111, and the second rubber ring 132 is located at the connection between the ball groove 140 and the second connecting pipe 112.

[0054] In this embodiment, the valve stem 430 includes a connecting rod, a second limiting ring 435 and a third limiting ring 436. The connecting rod is vertically arranged, and the second limiting ring 435 and the third limiting ring 436 are sequentially arranged from bottom to top. The first bellows 460 connects the second limiting ring 435 and the valve seat 100, and the second bellows 440 connects the third limiting ring 436 and the valve seat 100.

[0055] Working process: In the initial state, when the ball 500 is in the first state, the first channel 110 and the third channel 130 are connected, and the water flows in the direction from the first connecting pipe 111 to the second connecting pipe 112. The high-temperature and high-pressure fluid vacuum bellows ball valve is in the open state. The sliding rod 453 is on the first plane 4311 in the first inclined groove 431.

[0056] The first rubber ring 131 and the second rubber ring 132 prevent water flowing from the first channel 110 and the third channel 130 from entering the ball groove 140. The first bellows 460 performs a first layer of sealing on the valve stem 430 to prevent water leaking into the ball groove 140 from entering the second channel 120. The first sealing ring 451 and the second sealing ring 452 on the sealing tube 450 perform a second layer of sealing on the valve stem 430 to enhance the sealing performance and ensure that the first bellows 460 is sealed in time when there is a problem with the sealing, providing double protection. The second bellows 440 performs a third layer of sealing on the valve stem 430 to isolate the external environment and prevent the internal components of the valve stem 430 from oxidation and rust.

[0057] When the high-temperature and high-pressure fluid vacuum bellows ball valve needs to be closed, the wheel 300 is rotated forward, and the wheel 300 drives the shaft 410 to rotate. When the shaft 410 rotates, the gear 420 drives the rack 433 to move upward, thereby causing the valve stem 430 to move upward. When the valve stem 430 moves upward, the protrusion 473 slides in the second slide groove 434, and when the valve stem 430 moves upward, the rotating rod 470 rotates forward, and the rotating rod 470 drives the ball 500 to rotate forward synchronously, so that the first channel 110 and the third channel 130 are no longer connected, and the ball 500 is in the second state. When the high-temperature and high-pressure fluid vacuum bellows ball valve needs to be opened, the wheel 300 is rotated reversely, and the gear 420 drives the valve stem 430 to move downward. At this time, the rotating rod 470 rotates reversely, so that the first channel 110 and the third channel 130 are connected again, and the ball 500 is in the first state.

[0058] During the operation of the high-temperature and high-pressure fluid vacuum bellows ball valve, the ball 500 is often in an unbalanced force state on both sides. For example, when the high-temperature and high-pressure fluid vacuum bellows ball valve is closed, the first connecting pipe 111 is filled with liquid, while the second connecting pipe 112 is empty, so that the pressure in the first connecting pipe 111 is greater than the pressure in the second connecting pipe 112. At this time, the force on the side of the ball 500 close to the first connecting pipe 111 is greater than the force on the side of the ball 500 close to the second connecting pipe 112. Therefore, the valve stem 430 itself will tilt after receiving a torque, and the lower end of the valve stem 430 will be close to the second connecting pipe 112. At this time, the squeezing degree of the first sealing ring 451 and the second sealing ring 452 close to the second connecting pipe 112 will be greater than the squeezing degree of the first sealing ring 451 and the second sealing ring 452 close to the first connecting pipe 111, that is, the wear degree of the first sealing ring 451 and the second sealing ring 452 close to the second connecting pipe 112 is greater.

[0059] When the valve stem 430 moves upward, the sliding rod 453 on the sealing tube 450 moves downward relative to the valve stem 430, and the sliding rod 453 passes through the first inclined groove 431 and then arrives in the second plane 4313. The sliding rod 453 rotates positively by a preset angle when moving in the first inclined groove 431. Then, under the guidance of the second plane 4313 of the first inclined groove 431, and the distance between the second plane 4313 and the axis of the valve stem 430 is greater than the distance between the fourth plane 4323 and the axis of the valve stem 430, the sliding rod 453 falls into the fourth plane 4323 of the second inclined groove 432.

[0060] Then, when the valve stem 430 moves downward, the sliding rod 453 passes through the second inclined surface 4322 from the fourth plane 4323 to the third plane 4321, and the sliding rod 453 rotates positively by a preset angle when moving in the second inclined groove 432. Thereafter, under the guidance of the third plane 4321 on the second inclined groove 432, and the distance between the third plane 4321 and the axis of the valve stem 430 is greater than the distance between the first plane 4311 and the axis of the valve stem 430, the sliding rod 453 falls into the first plane 4311 of the first inclined groove 431.

[0061] When the valve stem 430 moves up and down, the sliding rod 453 rotates forward by a preset angle, thereby changing the contact portion between the first sealing ring 451, the second sealing ring 452 and the inner wall of the second channel 120 near the second connecting pipe 112, thereby making the circumferential wear of the first sealing ring 451 and the second sealing ring 452 more uniform, thereby increasing the service life of the first sealing ring 451 and the second sealing ring 452.

[0062] When the valve stem 430 moves upward and needs to close the high-temperature and high-pressure fluid vacuum bellows ball valve, since the rotation resistance of the closing ball 500 is initially large and then small when it rotates, the pitch of the lower part of the second slide 434 is large, and the valve stem 430 moves upward for a long distance and rotates at a small angle. The pitch of the upper part of the second slide 434 is small, and the valve stem 430 moves upward for a short distance and rotates at a large angle. The valve stem 430 rotates slowly in the more strenuous part to prevent the large torsional force from damaging the valve stem 430. The valve stem 430 rotates quickly in the less strenuous part, so that the switching between the first state and the second state of the ball 500 is completed quickly, improving work efficiency. It can also make the overall force of the valve stem 430 more uniform and the movement more stable.

[0063] When the valve stem 430 moves downward and needs to open the high-temperature and high-pressure fluid vacuum bellows ball valve, the rotation resistance of the opening ball 500 is initially small and then becomes larger when it rotates. Therefore, the pitch of the upper part of the second slide groove 434 is small, and the valve stem 430 moves downward for a short distance and rotates at a larger angle. The pitch of the lower part of the second slide groove 434 is large, and the valve stem 430 moves downward for a long distance and rotates at a lower angle, so that during the opening and closing process, the valve stem 430 is more evenly stressed and moves more smoothly.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature and high pressure fluid vacuum bellows ball valve, characterized in that: It includes a valve seat, a blocking mechanism and a sealing mechanism; the blocking mechanism includes a ball, a valve stem and a transmission assembly; a second channel arranged along the vertical direction is opened in the valve seat, the valve stem is vertically slidably arranged in the second channel, and the valve stem moves upward to drive the ball from an open state to a closed state through the transmission assembly; The sealing mechanism includes a first sealing assembly and a second sealing assembly which are sequentially arranged from bottom to top. The first sealing assembly includes a first bellows which is coaxially arranged with the valve stem. The first bellows is arranged outside the valve stem and connects the valve stem and the valve seat. The second sealing assembly includes a sealing tube and an adjusting unit. The sealing tube and the valve stem are coaxially arranged and rotatably sleeved on the outer side of the valve stem. A first sealing ring is fixedly arranged on the inner wall of the sealing tube, and a second sealing ring is fixedly arranged on the outer wall of the sealing tube. The first sealing ring and the second sealing ring are both coaxially arranged with the sealing tube, the first sealing ring and the valve stem are against each other, and the second sealing ring and the valve seat are against each other. When the valve stem moves up and down, the sealing tube is driven to rotate by a preset angle through the adjusting unit. A plurality of slide groove assemblies are provided in the middle of the outer peripheral wall of the valve stem and are sequentially distributed along the circumference of the valve stem. The slide groove assemblies include a first inclined groove and a second inclined groove. From top to bottom, the lower ends of the first inclined groove and the second inclined groove gradually approach each other. The inner circumferential wall of the sealing tube is provided with a plurality of first slide grooves sequentially distributed along the circumference of the sealing tube, and the first slide grooves are arranged along the radial direction of the sealing tube; the adjustment unit comprises a plurality of sliding rods and a plurality of springs; the sliding rods are arranged along the radial direction of the sealing tube, and one end of the sliding rods is slidably arranged in the first slide grooves; the other end of the sliding rods is slidably arranged in the first inclined groove or the second inclined groove; the springs connect the sliding rods and the sealing tube; The bottom of the first inclined groove includes a first plane, a first inclined surface and a second plane sequentially distributed from top to bottom; and along the direction from top to bottom, the first inclined surface gradually moves away from the axis of the valve stem; The distance between the second plane and the axis of the valve stem is greater than the distance between the first plane and the axis of the valve stem; The bottom of the second inclined groove includes a third plane, a second inclined plane and a fourth plane which are distributed in sequence from top to bottom; along the direction from top to bottom, the second inclined plane gradually approaches the axis of the valve stem, and the distance between the third plane and the axis of the valve stem is greater than the distance between the fourth plane and the axis of the valve stem; the distance between the third plane and the axis of the valve stem is greater than the distance between the first plane and the axis of the valve stem; the distance between the second plane and the axis of the valve stem is greater than the distance between the fourth plane and the axis of the valve stem.

2. A high temperature and high pressure fluid vacuum bellows ball valve according to claim 1, characterized in that: A first channel arranged in the horizontal direction is opened in the valve seat, the first channel is connected to the second channel, and a ball groove is opened at the connection point of the first channel and the second channel; the ball is rotatably arranged in the ball groove, and a third channel arranged in the horizontal direction is opened on the ball. The open state of the ball is that the third channel is connected to the first channel, and the closed state of the ball is that the third channel is not connected to the first channel.

3. A high temperature and high pressure fluid vacuum bellows ball valve according to claim 2, characterized in that: A plurality of second slide grooves are provided on the lower part of the peripheral wall of the valve stem, and the plurality of second slide grooves are sequentially distributed along the circumference of the valve stem; each second slide groove is spiral, and the pitch of the second slide groove gradually increases from top to bottom; the transmission assembly includes a rotating rod, which is vertically arranged, and the rotating rod is arranged on the sphere and rotates synchronously with the sphere; the upper end of the rotating rod is located in the second channel, and a first mounting groove is provided on the upper end of the rotating rod, and the first mounting groove is vertically arranged, and the lower end of the valve stem is slidably arranged in the first mounting groove; a plurality of protrusions are arranged in the first mounting groove, and the protrusions are slidably arranged in the second slide groove.

4. A high temperature and high pressure fluid vacuum bellows ball valve according to claim 3, characterized in that: The sphere is provided with a square groove, which is arranged vertically; a square rod is fixedly arranged at the lower end of the rotating rod, which is arranged vertically and is arranged in the square groove.

5. The high temperature and high pressure fluid vacuum bellows ball valve according to claim 3, characterized in that: A first limiting ring is fixedly arranged on the rotating rod. The first limiting ring and the rotating rod are arranged coaxially. The first limiting ring is arranged at the connection between the ball groove and the second channel. The first limiting ring is used to abut against the valve seat.

6. A high temperature and high pressure fluid vacuum bellows ball valve according to claim 2, characterized in that: The sealing mechanism also includes a third sealing component, which includes a second bellows, which is vertically arranged, arranged outside the valve stem, and located at the upper part of the valve stem; the second bellows connects the valve stem and the valve seat.

7. A high temperature and high pressure fluid vacuum bellows ball valve according to claim 2, characterized in that: A rack is fixedly provided at the upper end of the valve stem, and the rack is vertically arranged; the horizontal direction where the first channel is located is the first direction; the sealing mechanism also includes a driving assembly, and the driving assembly includes a rotating wheel, a rotating shaft and a gear; the rotating shaft is arranged along a second direction, the second direction is a horizontal direction, and the second direction is perpendicular to the first direction; the rotating shaft is rotatably arranged on the valve seat; the rotating wheel and the gear are respectively fixedly arranged at both ends of the rotating shaft, and the gear and the rack are meshed.

8. The high-temperature and high-pressure fluid vacuum bellows ball valve according to claim 7, characterized in that: The first channel includes a first connecting pipe and a second connecting pipe, which are respectively located on both sides of the ball groove along the first direction; the first rubber ring and the second rubber ring are respectively provided at both ends of the third channel, the first rubber ring is located at the connection between the ball groove and the first connecting pipe, and the second rubber ring is located at the connection between the ball groove and the second connecting pipe.

9. The high temperature and high pressure fluid vacuum bellows ball valve according to claim 6, characterized in that: The valve stem includes a connecting rod, a second limiting ring and a third limiting ring; the connecting rod is vertically arranged, and the second limiting ring and the third limiting ring are distributed in sequence from bottom to top; the first bellows connects the second limiting ring and the valve seat, and the second bellows connects the third limiting ring and the valve seat.

Images