A high self-adjusting top-entry cryogenic ball valve with a ball core

Abstract

The present application relates to the field of valve technology, and in particular to a ball core center high self-adjusting top-mounted cryogenic ball valve, comprising a valve body with a valve cavity, a ball core installed in the valve cavity to control the opening and closing of the valve cavity, a valve stem arranged on the ball core, and a valve cover arranged on the upper opening of the valve body, the valve stem is rotatably arranged in the valve cover, the two sides of the valve body are respectively provided with an inlet medium end pipe and an outlet medium end pipe connected to the valve cavity, the inner wall of the valve body is provided with a valve seat abutting against the ball core, the lower part of the valve body has a loading cavity connected to the valve cavity, the valve body is provided with a loading assembly built into the loading cavity, the loading assembly includes a lifting block connected to the inner wall of the loading cavity along a vertical sliding movement to support the bottom end of the ball core and a first elastic member forcing the lifting block to move upward under normal conditions, the inner cavity of the inlet medium end pipe and the loading cavity are connected with a first flow channel, and the outlet medium port of the first flow channel is located below the lifting block. The present application has the effect of improving the sealing performance of the cryogenic ball valve.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a top-mounted cryogenic ball valve with a highly self-adjusting center of a ball core. Background Art

[0002] Cryogenic ball valve is a valve mainly used in chemical plants such as ethylene and liquefied natural gas. For top-mounted cryogenic ball valves, the valve core is a ball core, which needs to be precisely positioned with the valve body to ensure that the center position of the ball core is always on the same horizontal plane as the valve seat and the center of the flow channel.

[0003] The entire installation and commissioning process of the cryogenic ball valve is carried out under normal temperature conditions. When the valve works under low temperature conditions, the ball core shrinks due to the cold and the gravity of the ball core and the valve stem causes the center position of the ball core to shift vertically, causing a relative offset between the center height of the ball core and the center height of the valve seat. As a result, the spherical surface of the ball core and the sealing surface of the valve seat cannot fit completely, affecting the sealing performance of the valve, so further improvement is needed. Summary of the invention

[0004] In order to improve the sealing performance of the cryogenic ball valve, the present application provides a top-mounted cryogenic ball valve with a high self-adjusting center of the ball core.

[0005] The present application provides a high self-adjusting top-entry cryogenic ball valve with a ball core center, which adopts the following technical solution:

[0006] A high self-adjusting top-mounted low-temperature ball valve with a ball core center, comprising a valve body with a valve cavity, a ball core installed in the valve cavity to control the opening and closing of the valve cavity, a valve stem arranged on the ball core and a valve cover covering the upper opening of the valve body, the valve stem rotatably penetrates the valve cover, the two sides of the valve body are respectively provided with an inlet medium end pipe and an outlet medium end pipe connected to the valve cavity, the inner wall of the valve body is provided with a valve seat abutting the ball core, the lower part of the valve body is provided with a loading cavity connected to the valve cavity, the valve body is provided with a loading assembly built into the loading cavity, the loading assembly comprises a lifting block connected to the inner wall of the loading cavity along a vertical sliding manner to support the bottom end of the ball core and a first elastic member that forces the lifting block to move upward under normal conditions, a first flow channel is connected between the inner cavity of the inlet medium end pipe and the loading cavity, and the outlet medium port of the first flow channel is located below the lifting block.

[0007] By adopting the above technical solution, when the medium is stored in the storage tank, it is usually stored under pressure. When the cryogenic ball valve is in a low temperature environment, on the one hand, the first elastic member supports the lifting block in a normal state, and on the other hand, when the valve cavity is in a closed state, the pressurized medium in the storage tank enters the loading cavity through the first flow channel. The pressure of the pressurized medium and the elastic loading force provided by the first elastic member act together on the lifting block, so that the lifting block can compensate for the downward movement of the ball core caused by the cold contraction of the ball core, ensure the stability of the center height of the ball core when the valve is changed from a normal temperature environment to a low temperature environment, effectively reduce the fit between the ball core and the inner wall of the valve seat caused by the high offset of the center height of the ball core, and improve the sealing and reliability of the ball valve under low temperature conditions. In addition, when the valve cavity is in a connected state, the pressure in the loading cavity is reduced, so that the lifting force on the ball core is reduced, thereby reducing the rotational torque of the ball core.

[0008] Preferably, a secondary flow channel is connected between the inner cavity of the outlet medium end tube and the loading cavity, and the medium inlet of the second flow channel is located below the jacking block. The valve body is slidably connected to a first sealing plate for controlling the opening and closing of the outlet medium of the first flow channel and a second sealing plate for controlling the opening and closing of the inlet medium of the second flow channel. The loading assembly also includes an upper mounting plate fixedly connected to the lower end surface of the jacking block, a mounting groove is coaxially provided on the lower end surface of the upper mounting plate, and the upper mounting plate is provided with a purge plate vertically slidably connected to the mounting groove, the purge plate has a purge cavity, and an air outlet connected to the purge cavity is provided on the upper end surface of the purge plate, and the ball core is provided with a purge control component for controlling the downward movement of the purge plate. Under normal circumstances, the upper end surface of the purge plate abuts against the top inner wall of the mounting groove so that the air outlet is in a closed state.

[0009] By adopting the above technical solution, when the valve cavity is in a closed state, the medium outlet of the first flow channel is opened, and the second sealing plate seals the medium inlet of the second flow channel, so that the pressurized medium in the storage tank can enter the loading cavity through the first flow channel to assist in lifting the upper mounting plate. When the medium needs to be transported, the first sealing plate seals the medium outlet of the first flow channel, and the second sealing plate is slid to open the medium inlet of the second flow channel. On the one hand, the pressure in the loading cavity is relieved, reducing the lifting force of the loading component on the ball core, thereby reducing the opening rotation torque of the ball core, and on the other hand On the one hand, the first flow channel is blocked, and the medium in the medium-end pipe is effectively prevented from being continuously discharged directly from the first flow channel, the loading chamber and the second flow channel, so as to ensure the metering accuracy during medium transportation; then the valve stem is rotated to drive the ball core to rotate, so that the valve chamber is connected. After the medium is transported, the purge plate is driven downward by the purge control component, so that the purge plate is removed from the mounting groove, and inert gas is injected into the purge chamber. The gas enters the loading chamber from the air outlet, thereby squeezing the medium in the loading chamber and the second flow channel or blowing it into the medium-end pipe for discharge, reducing the residual medium or realizing the renewal of the medium in the loading chamber.

[0010] Preferably, the loading assembly also includes a lower mounting plate located below the upper mounting plate and arranged at the lower part of the loading chamber, the first elastic member is a first spring, the upper end of the first spring abuts or is fixedly connected to the lower end surface of the upper mounting plate, the lower end of the first spring abuts or is fixedly connected to the upper end surface of the lower mounting plate, and the first spring always remains in a compressed state.

[0011] By adopting the above technical solution, the first spring has good elastic recovery performance to provide a stable loading force to the ball core.

[0012] Preferably, the bottom of the ball core is coaxial and has a rotation-stop groove vertically opened, the cross-section of the rotation-stop groove is polygonal, the cross-section of the lifting block is correspondingly polygonal, the lifting block is inserted in the rotation-stop groove, the upper mounting plate and the lower mounting plate are both coaxially rotatably connected to the inner wall of the loading chamber, the loading assembly also includes a guide rod arranged between the upper mounting plate and the lower mounting plate, the lower end of the guide rod is fixedly connected to the upper end surface of the lower mounting plate, the upper end of the guide rod is slidably penetrated through the upper mounting plate, the first sealing plate and the second sealing plate are both vertically slidably connected to the inner wall of the loading chamber, and the lower mounting plate is provided with a linkage mechanism for synchronously driving the first sealing plate and the second sealing plate to slide in opposite directions.

[0013] By adopting the above technical scheme, when the valve cavity is in a closed state, the first sealing plate is located above the medium outlet of the first flow channel, so that the medium outlet of the first flow channel is open, and the second sealing plate closes the medium inlet of the second flow channel. When the medium needs to be transported, the valve stem drives the ball core to rotate, so that the through hole axis of the ball core is parallel to the axial direction of the medium inlet end pipe / medium outlet end pipe, so that the valve cavity is in a connected state, and the ball core synchronously drives the lifting block and the upper mounting plate to rotate, thereby driving the lower mounting plate to rotate synchronously through the guide rod. The rotation of the lower mounting plate synchronously drives the first sealing plate to move downward and the second sealing plate to move upward through the linkage mechanism. The first sealing plate closes the medium outlet of the first flow channel, and the second sealing plate is located above the medium inlet of the second flow channel, so that the medium inlet of the second flow channel is in an open state. The synchronous sliding of the first sealing plate and the second sealing plate can be achieved without adding additional driving elements.

[0014] Preferably, the linkage mechanism includes a first drive shaft coaxially fixedly connected to the upper end surface of the lower mounting plate, a first connecting rod protruding and fixedly connected to the first sealing plate, and a second connecting rod protruding and fixedly connected to the second sealing plate. The outer peripheral wall of the first drive shaft is provided with a first guide groove and a second guide groove. The first guide groove and the second guide groove are both spiral grooves, and the rotation directions of the first guide groove and the second guide groove are opposite. The end of the first connecting rod is slidably inserted into the first guide groove, and the end of the second connecting rod is slidably inserted into the second guide groove.

[0015] By adopting the above technical scheme, when the valve cavity is in a closed state, the end of the first connecting rod on the first sealing plate is located at the upper part of the first guide slot, and the first sealing plate is located above the outlet of the medium of the first flow channel, so that the outlet of the medium of the first flow channel is in an open state, and the end of the second connecting rod on the second sealing plate is located at the lower part of the second guide slot, and the second sealing plate closes the inlet of the medium of the second flow channel; when it is necessary to transport the medium, the valve stem is used to drive the ball core to rotate 90° in the positive direction, so that the through hole axis of the ball core is parallel to the axial direction of the inlet medium end pipe / outlet medium end pipe, so that the valve cavity is in a connected state, and the ball core is connected to the valve cavity. The core synchronously drives the lifting block and the upper mounting plate to rotate, thereby driving the lower mounting plate to rotate synchronously through the guide rod. The rotation of the lower mounting plate drives the first driving shaft to rotate coaxially. The first connecting rod moves downward to the lower part of the first guide slot under the action of the inner wall of the first guide slot, thereby driving the first sealing plate to move downward, so that the first sealing plate closes the outlet medium port of the first flow channel. At the same time, the second connecting rod climbs to the upper part of the second guide slot under the action of the inner wall of the second guide slot, thereby driving the second sealing plate to move up. The second sealing plate is located above the medium inlet of the second flow channel, so that the medium inlet of the second flow channel is in an open state.

[0016] Preferably, a bracket is fixedly connected to the bottom inner wall of the loading chamber, and a lower mounting plate is coaxially rotatably connected to the bracket. The linkage mechanism includes a second driving shaft coaxially fixedly penetrated by the lower mounting plate, a linkage rod located below the second driving shaft and rotatably connected to the inner wall / bracket of the loading chamber, a transmission gear coaxially fixedly sleeved on the linkage rod, a third connecting rod fixedly connected to the first closing plate, a first rack fixedly connected to the end of the third connecting rod, a fourth connecting rod fixedly connected to the second closing plate, and a second rack fixedly connected to the end of the fourth connecting rod. The axial direction of the linkage rod is horizontally arranged, and the linkage rod and the second driving shaft are meshed and transmitted through a bevel gear group. The transmission gear is located between the first rack and the second rack, and the first rack and the second rack are both meshed with the transmission gear.

[0017] By adopting the above technical scheme, when the valve chamber is in a closed state, the first sealing plate is located above the medium outlet of the first flow channel, so that the medium outlet of the first flow channel is in an open state, and the second sealing plate closes the medium inlet of the second flow channel; when the medium needs to be transported, the valve stem drives the ball core to rotate in the positive direction, so that the through hole axis of the ball core is parallel to the axial direction of the medium inlet end pipe / medium outlet end pipe, so that the valve chamber is in a connected state, and the ball core synchronously drives the lifting block and the upper mounting plate to rotate, thereby driving the lower mounting plate to rotate synchronously through the guide rod, and the rotation of the lower mounting plate drives the second drive shaft to rotate coaxially, and drives the linkage rod to rotate synchronously through the bevel gear set, thereby realizing the rotation of the transmission gear. During the rotation of the transmission gear, the third connecting rod and the first sealing plate are driven downward by the first rack, so that the first sealing plate closes the medium outlet of the first flow channel, and at the same time, the fourth connecting rod and the second sealing plate are driven upward by the second rack, and the second sealing plate is located above the medium inlet of the second flow channel, so that the medium inlet of the second flow channel is in an open state.

[0018] Preferably, the linkage rod includes a first transmission rod rotatably connected to the inner wall of one side of the loading chamber and a second transmission rod rotatably connected to the inner wall of the other side of the loading chamber, the bevel gear group includes a first bevel gear coaxially fixedly sleeved on the second drive shaft and a second bevel gear coaxially fixedly sleeved on the first transmission rod, the first bevel gear is meshed with the second bevel gear, and a shift rod is rotatably connected to the inner wall of the loading chamber, the shift rod is parallel to the linkage rod, the shift rod and the first transmission rod are meshed and transmitted through an acceleration gear group, the shift rod and the second transmission rod are meshed and transmitted through a synchronous gear group, and the transmission gear is coaxially fixedly sleeved on the second transmission rod.

[0019] By adopting the above technical scheme, when the valve cavity is in a closed state, the first sealing plate is located above the medium outlet of the first flow channel, so that the medium outlet of the first flow channel is in an open state, and the second sealing plate closes the medium inlet of the second flow channel; when the medium needs to be transported, the valve stem drives the ball core to rotate 90° in the positive direction, so that the through-hole axis of the ball core is parallel to the axial direction of the medium inlet end pipe / medium outlet end pipe, so that the valve cavity is in a connected state, and the ball core synchronously drives the lifting block and the upper mounting plate to rotate, thereby driving the lower mounting plate to rotate synchronously through the guide rod, and the rotation of the lower mounting plate drives the second drive shaft to rotate coaxially, and synchronously drives the first transmission rod to rotate through the first bevel gear and the second bevel gear, the first transmission rod drives the speed change rod to rotate through the acceleration gear set, and the speed change rod drives the second transmission rod to rotate through the synchronous gear set to realize the rotation of the transmission gear, and when the valve stem rotates 90°, the rotation angle of the transmission gear is increased through the speed change rod, thereby increasing the moving stroke of the first rack and the second rack, so as to realize the closing of the medium outlet of the first flow channel and the opening of the medium inlet of the second flow channel.

[0020] Preferably, the purge control component includes a movable tube coaxially fixedly connected to the upper end surface of the purge plate and a second elastic component that drives the movable tube to slide upward under normal conditions so that the upper end surface of the purge plate abuts against the inner wall of the top of the mounting groove. The inner cavity of the movable tube is connected to the purge cavity. The movable tube is coaxially slidably penetrates the lifting block, the ball core and the valve stem. The upper part of the movable tube protrudes from the upper end of the valve stem, and the movable tube is externally connected to an air injection pump.

[0021] By adopting the above technical solution, after the medium is transported, a force is applied to the movable tube to make the movable tube move downward, thereby driving the purge plate to move downward, so that the purge plate is removed from the mounting groove, and inert gas is injected into the purge cavity through the movable tube, and the gas enters the loading cavity from the gas outlet hole, thereby squeezing the medium in the loading cavity and the secondary flow channel to the medium outlet end pipe, and discharged from the medium outlet end pipe. After the force applied to the movable tube is removed, the second elastic member forces the purge plate to contact the top inner wall of the mounting groove again.

[0022] Preferably, the upper part of the movable tube is fixedly connected to a mounting plate located above the valve stem, the second elastic member is a second spring, the upper end of the second spring is fixedly connected to the lower end surface of the mounting plate, the lower end of the second spring is fixedly connected to the upper end surface of the valve stem, and the second spring is in a compressed state to maintain a vertical sliding lifting force on the mounting plate so that the upper end surface of the purge plate abuts against the top inner wall of the mounting groove.

[0023] By adopting the above technical solution, the second spring has good elastic recovery performance, maintains the lifting force exerted on the mounting plate to slide vertically, and increases the stable elastic loading force provided to the ball core.

[0024] Preferably, a protective baffle is integrally fixed to the inner wall of the through hole of the ball core, which divides the through hole into two channels, and the protective baffle has a sliding cavity for the movable tube to slide through.

[0025] By adopting the above technical solution, a protective baffle is added to protect the movable pipe, thereby effectively preventing the medium from impacting the movable pipe during the transportation process.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the medium is stored in the storage tank, it is usually stored under pressure. When the cryogenic ball valve is in a low-temperature environment, on the one hand, the first elastic member supports the lifting block in a normal state. On the other hand, when the valve cavity is in a closed state, the pressurized medium in the storage tank enters the loading cavity through the first flow channel. The pressure of the pressurized medium and the elastic loading force provided by the first elastic member act together on the lifting block, so that the lifting block can compensate for the downward movement of the ball core caused by the cold contraction of the ball core, ensure the stability of the center height of the ball core when the valve changes from a normal temperature environment to a low-temperature environment, effectively reduce the fit between the ball core and the inner wall of the valve seat caused by the high deviation of the center height of the ball core, and improve the sealing and reliability of the ball valve under low-temperature conditions. In addition, when the valve cavity is in a connected state, the pressure in the loading cavity is reduced, so that the lifting force on the ball core is reduced, and the rotational torque of the ball core is reduced;

[0028] 2. When the valve cavity is in a closed state, the medium outlet of the first flow channel is opened, and the second sealing plate seals the medium inlet of the second flow channel, so that the pressurized medium in the storage tank can enter the loading cavity through the first flow channel to assist in lifting the upper mounting plate. When the medium needs to be transported, the first sealing plate seals the medium outlet of the first flow channel, and the second sealing plate slides to open the medium inlet of the second flow channel. On the one hand, the pressure in the loading cavity is relieved, reducing the lifting force of the loading component on the ball core, thereby reducing the opening torque of the ball core. On the other hand, The first flow channel is blocked to effectively prevent the medium in the medium inlet end tube from being continuously discharged directly from the first flow channel, the loading chamber and the second flow channel, thereby ensuring the metering accuracy during medium transportation; then the valve stem is rotated to drive the ball core to rotate, so that the valve chamber is connected. After the medium is transported, the purge plate is driven downward by the purge control component to make the purge plate escape from the mounting groove, and inert gas is injected into the purge chamber. The gas enters the loading chamber from the air outlet, thereby squeezing the medium in the loading chamber and the second flow channel or blowing it into the medium outlet end tube for discharge, thereby reducing the residual medium or realizing the medium renewal in the loading chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a top-mounted cryogenic ball valve with a high self-adjusting center of a ball core in Example 1.

[0030] Figure 2 It is a structural schematic diagram of the loading component and linkage mechanism in Example 1.

[0031] Figure 3 It is a schematic diagram of the structure of the upper mounting plate and the purge plate in Example 1.

[0032] Figure 4 It is a schematic diagram of the structure of the purge control component in Example 1.

[0033] Figure 5 Schematic diagram of the structure of the core in Example 2.

[0034] Figure 6 It is a structural schematic diagram of a top-mounted cryogenic ball valve with a high self-adjusting center of a ball core in Example 3.

[0035] Figure 7 It is a structural schematic diagram of the linkage mechanism in Example 3.

[0036] Explanation of the reference numerals: 1. valve body; 11. valve seat; 12. medium inlet end pipe; 13. medium outlet end pipe; 14. loading chamber; 15. first flow channel; 16. second flow channel; 17. first sealing plate; 18. second sealing plate; 19. bracket; 191. support plate; 192. support rod; 2. ball core; 21. anti-rotation groove; 22. protective partition; 23. sliding chamber; 3. valve stem; 4. valve cover; 5. loading assembly; 51. upper mounting plate; 511. mounting groove; 52. lifting block; 53. lower mounting plate; 54. guide rod; 55. first spring; 56. purge plate; 561. purge chamber; 562. air outlet ;6. Linkage mechanism;61. First drive shaft;611. First guide slot;612. Second guide slot;62. First connecting rod;63. Second connecting rod;64. Second drive shaft;641. First bevel gear;65. Linkage rod;651. First transmission rod;652. Second transmission rod;653. Second bevel gear;654. Shift lever;655. Acceleration gear set;656. Synchronous gear set;66. Transmission gear;67. Third connecting rod;68. First rack;69. Fourth connecting rod;60. Second rack;7. Purge control;71. Movable tube;72. Second spring;73. Mounting plate. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-7 This application is described in further detail.

[0038] Embodiment 1:

[0039] The present application discloses a top-loading cryogenic ball valve with high self-adjustment at the center of the ball core, referring to Figure 1 , comprising a valve body 1 having a valve cavity, a ball core 2 installed in the valve cavity to control the opening and closing of the valve cavity, a valve stem 3 fixedly connected to the upper part of the ball core 2, and a valve cover 4 covering the upper opening of the valve body 1. The two sides of the valve body 1 are respectively integrally formed with an inlet medium end pipe 12 and an outlet medium end pipe 13 connected to the valve cavity, and the inlet medium end pipe 12 is used to be externally connected to a storage tank for storing the medium. The inner wall of the valve body 1 is provided with a valve seat 11 abutting against the outer wall of the ball core 2, and the valve cover 4 is locked to the upper end surface of the valve body 1 by bolts, and the valve stem 3 is rotatably penetrated through the valve cover 4.

[0040] The lower part of the valve body 1 has a loading chamber 14 connected to the valve chamber. The loading chamber 14 is located below the ball valve. The loading chamber 14 is a circular chamber. The valve body 1 is provided with a first flow channel 15 connected between the inner chamber of the medium inlet end tube 12 and the loading chamber 14, and a second flow channel 16 connected between the inner chamber of the medium outlet end tube 13 and the loading chamber 14. The outlet of the first flow channel 15 and the inlet of the second flow channel 16 are respectively located at the lower part of the inner wall on both sides of the opposite sides of the loading chamber 14, the inlet of the first flow channel 15 is located at the bottom inner wall of the medium inlet end tube 12, and the outlet of the second flow channel 16 is located at the bottom inner wall of the medium outlet end tube 13.

[0041] Reference Figure 1 , Figure 2 The valve body 1 is provided with a loading assembly 5 built into the loading chamber 14. In this embodiment, the loading assembly 5 includes an upper mounting plate 51, a lifting block 52, a lower mounting plate 53, a guide rod 54 and a first elastic member. The lower mounting plate 53 and the upper mounting plate 51 are both disc-shaped structures. The lower mounting plate 53 is coaxially connected to the bottom inner wall of the loading chamber 14. The outer peripheral wall of the upper mounting plate 51 is sealed against the inner peripheral wall of the loading chamber 14. The upper mounting plate 51 is located above the lower mounting plate 53, and the upper mounting plate 51 is axially slidably connected to the upper part of the loading chamber 14. The upper mounting plate 51 is located above the medium outlet of the first flow channel 15 and the medium inlet of the second flow channel 16. The guide rod 54 is vertically arranged, the lower end of the guide rod 54 is fixedly connected to the upper end surface of the lower mounting plate 53, and the upper part of the guide rod 54 is slidably arranged in the upper mounting plate 51. The first elastic member is a first spring 55 sleeved on the guide rod 54, the upper end of the first spring 55 abuts or is fixedly connected to the lower end surface of the upper mounting plate 51, and the lower end of the first spring 55 abuts or is fixedly connected to the upper end surface of the lower mounting plate 53. The first spring 55 always maintains a compressed state to force the upper mounting plate 51 to always maintain an upward lifting force. The lifting block 52 is coaxially fixedly connected to the upper end surface of the upper mounting plate 51, the cross section of the lifting block 52 is square, the bottom of the ball core 2 has a plane, the bottom plane of the ball core 2 is coaxial and vertically provided with a rotation-stop groove 21, the cross section of the rotation-stop groove 21 is square to adapt to the lifting block 52, the lifting block 52 is slidably inserted in the rotation-stop groove 21, and the upper end surface of the lifting block 52 abuts against the top inner wall of the rotation-stop groove 21.

[0042] The valve body 1 is vertically slidably connected to a first sealing plate 17 for controlling the opening and closing of the medium outlet of the first flow channel 15 and a second sealing plate 18 for controlling the opening and closing of the medium inlet of the second flow channel 16. The first sealing plate 17 and the second sealing plate 18 are both axially slidably connected to the inner wall of the loading chamber 14. In other embodiments, the lower outer wall of the valve body 1 is provided with two opening and closing cylinders to separately control the sliding of the first sealing plate 17 and the second sealing plate 18.

[0043] Reference Figure 2 , Figure 3In this embodiment, the lower mounting plate 53 is provided with a linkage mechanism 6 for synchronously driving the first sealing plate 17 and the second sealing plate 18 to slide in opposite directions. Specifically, the linkage mechanism 6 includes a first driving shaft 61 coaxially fixedly connected to the upper end surface of the lower mounting plate 53, a first connecting rod 62 protrudingly fixedly connected to the first sealing plate 17, and a second connecting rod 63 protrudingly fixedly connected to the second sealing plate 18. The first driving shaft 61 is a hollow structure, and the outer peripheral wall of the first driving shaft 61 is provided with a first guide slot 611 and a second guide slot 612 connected to the inner cavity. The first guide slot 611 and the second guide slot 612 are both spiral slots, and the first guide slot 611 and the second guide slot 612 have opposite rotation directions. The end of the first connecting rod 62 is slidably penetrated in the first guide slot 611, and the end of the second connecting rod 63 is slidably penetrated in the second guide slot 612.

[0044] Reference Figure 3 , Figure 4 The lower end surface of the upper mounting plate 51 is coaxially provided with a mounting groove 511, which is a circular cavity. The upper mounting plate 51 is provided with a purge plate 56 connected to the mounting groove 511 in a vertical sliding manner. The purge plate 56 is a circular plate adapted to the mounting groove 511, and the purge plate 56 has a purge cavity 561. The upper end surface of the purge plate 56 is provided with an air outlet 562 connected to the purge cavity 561. The ball core 2 is provided with a purge control member 7 for controlling the downward movement of the purge plate 56. The purge control member 7 includes a movable tube 71 coaxially fixedly connected to the upper end surface of the purge plate 56 and a second elastic member that drives the movable tube 71 to slide upward under normal conditions so that the upper end surface of the purge plate 56 abuts against the inner wall of the top of the mounting groove 511 so that the air outlet 562 is closed. The inner cavity of the movable tube 71 is connected to the purge chamber 561. The movable tube 71 is coaxially slidably penetrated through the lifting block 52, the ball core 2 and the valve stem 3. The upper part of the movable tube 71 protrudes from the upper end of the valve stem 3. The movable tube 71 and the valve stem 3 are circumferentially linked, and the movable tube 71 is externally connected to the air injection pump. The upper part of the movable tube 71 is fixedly connected to the mounting plate 73 located above the valve stem 3. The second elastic member is a second spring 72. The upper end of the second spring 72 is fixedly connected to the lower end surface of the mounting plate 73. The lower end of the second spring 72 is fixedly connected to the upper end surface of the valve stem 3. The second spring 72 is in a compressed state, maintaining the lifting force of the vertical sliding on the mounting plate 73, so that the upper end surface of the purge plate 56 abuts against the inner wall at the top of the mounting groove 511.

[0045] The implementation principle of the embodiment of the present application is as follows: when the medium is stored in the storage tank, it is usually stored under pressure. When the cryogenic ball valve is in a low-temperature environment and when the valve chamber is in a closed state, the end of the first connecting rod 62 on the first sealing plate 17 is located at the upper part of the first guide groove 611, and the first sealing plate 17 is located above the medium outlet of the first flow channel 15, so that the medium outlet of the first flow channel 15 is in an open state, and the end of the second connecting rod 63 on the second sealing plate 18 is located at the lower part of the second guide groove 612, and the second sealing plate 18 closes the medium inlet of the second flow channel 16, and the first spring 55 lifts and supports the upper mounting plate 51 and the lifting block 52, and the first sealing plate 18 is closed. The second spring 72 also applies a lifting force to the upper mounting plate 51 and the lifting block 52 through the movable tube 71 and the purge plate 56. In addition, the pressurized medium in the storage tank enters the loading chamber 14 through the first flow channel 15. The pressure of the pressurized medium and the elastic loading force provided by the first spring 55 and the second spring 72 act together on the lifting block 52, so that the lifting block 52 can compensate for the downward movement of the ball core 2 caused by the cold contraction of the ball core 2, ensuring the stability of the center height of the ball core 2 when the valve is changed from a normal temperature environment to a low temperature environment, effectively reducing the fit between the ball core 2 and the inner wall of the valve seat 11 caused by the deviation of the center height of the ball core 2, and improving the sealing and reliability of the ball valve under low temperature conditions;

[0046] When it is necessary to transport the medium, the valve stem 3 drives the ball core 2 to rotate 90° in the positive direction, so that the through-hole axis of the ball core 2 is parallel to the axial direction of the medium inlet pipe 12 / the medium outlet pipe 13, so that the valve cavity is in a connected state, and the ball core 2 synchronously drives the lifting block 52 and the upper mounting plate 51 to rotate, thereby driving the lower mounting plate 53 to rotate synchronously through the guide rod 54, and the rotation of the lower mounting plate 53 drives the first drive shaft 61 to rotate coaxially, and the first connecting rod 62 moves down to the lower part of the first guide slot 611 under the action of the inner wall of the first guide slot 611, thereby driving the first sealing plate 17 to move down, so that the first sealing plate 17 closes the outlet of the first flow channel 15. At the same time, the second connecting rod 63 climbs to the upper part of the second guide slot 612 under the action of the inner wall of the second guide slot 612, thereby driving the second sealing plate 18 to move up. The second sealing plate 18 is located above the medium inlet of the second flow channel 16, so that the medium inlet of the second flow channel 16 is in an open state. The first sealing plate 17 moves down to block the first flow channel 15, effectively preventing the medium in the medium inlet end tube 12 from being continuously discharged directly from the first flow channel 15, the loading chamber 14, and the second flow channel 16, thereby ensuring the metering accuracy during medium transportation.

[0047] After the medium is transported, a force is applied to the movable tube 71 to move the movable tube 71 downward, thereby driving the purge plate 56 to move downward, so that the purge plate 56 is removed from the mounting groove 511, and the gas injection pump is started to inject inert gas into the inner cavity of the movable tube 71 and the purge cavity 561. The gas enters the loading cavity 14 from the gas outlet 562, thereby squeezing the medium in the loading cavity 14 and the secondary flow channel 16 to the medium outlet end tube 13, and is discharged from the medium outlet end tube 13 to reduce the residual medium. After the force applied to the movable tube 71 is removed, the second spring 72 forces the purge plate 56 to abut against the top inner wall of the mounting groove 511 again, and the first sealing plate 17 and the second sealing plate 18 slide and reset.

[0048] Embodiment 2:

[0049] The difference from Example 1 is that, referring to Figure 5 The inner wall of the through hole of the ball core 2 is integrally fixed with a protective baffle 22 that divides the through hole into two channels, and the protective baffle 22 has a sliding cavity 23 for the movable tube 71 to slide through. The protective baffle 22 is added to protect the movable tube 71, effectively preventing the medium from impacting the movable tube 71 during the transportation process.

[0050] Embodiment 3:

[0051] The difference from Example 1 is that, referring to Figure 6 , Figure 7 The bottom inner wall of the loading chamber 14 is fixedly connected with a bracket 19, the bracket 19 includes a support plate 191 located below the lower mounting plate 53 and a plurality of support rods 192 fixedly connected to the lower end surface of the support plate 191, and the support rods 192 are fixedly connected to the bottom inner wall of the loading chamber 14. The lower mounting plate 53 is coaxially rotatably connected to the upper end surface of the support plate 191, the linkage mechanism 6 includes a second drive shaft 64 coaxially fixedly connected to the lower end surface of the lower mounting plate 53, a linkage rod 65 located below the second drive shaft 64 and rotatably connected to the inner wall of the loading chamber 14, a transmission gear 66 coaxially fixedly sleeved on the linkage rod 65, a third connecting rod 67 fixedly connected to the first sealing plate 17, a first rack 68 fixedly connected to the end of the third connecting rod 67, a fourth connecting rod 69 fixedly connected to the second sealing plate 18, and a second rack 60 fixedly connected to the end of the fourth connecting rod 69, and the second drive shaft 64 is coaxially rotatably penetrated through the support plate 191.

[0052] The axial direction of the linkage rod 65 is horizontally arranged, and the linkage rod 65 and the second drive shaft 64 are meshed and transmitted through a bevel gear set. The linkage rod 65 is located below the support plate 191, and the linkage rod 65 includes a first transmission rod 651 rotatably connected to the inner wall of one side of the loading chamber 14 and a second transmission rod 652 rotatably connected to the inner wall of the other side of the loading chamber 14, the bevel gear set includes a first bevel gear 641 coaxially fixedly sleeved on the second drive shaft 64 and a second bevel gear 653 coaxially fixedly sleeved on the first transmission rod 651, the first bevel gear 641 meshes with the second bevel gear 653, the inner wall of the loading chamber 14 is rotatably connected with a shift rod 654, the shift rod 654 is parallel to the linkage rod 65, the shift rod 654 and the first transmission rod 651 are meshed and transmitted through an acceleration gear set 655, the shift rod 654 and the second transmission rod 652 are meshed and transmitted through a synchronous gear set 656, and the transmission gear 66 is coaxially fixedly sleeved on the second transmission rod 652. The transmission gear 66 is located between the first rack 68 and the second rack 60 , and both the first rack 68 and the second rack 60 are meshed with the transmission gear 66 .

[0053] The implementation principle of the embodiment of the present application is as follows: when the valve cavity is in a closed state, the first sealing plate 17 is located above the medium outlet of the first flow channel 15, so that the medium outlet of the first flow channel 15 is in an open state, and the second sealing plate 18 closes the medium inlet of the second flow channel 16; when it is necessary to transport the medium, the valve stem 3 drives the ball core 2 to rotate 90° in the positive direction, so that the through-hole axis of the ball core 2 is parallel to the axial direction of the medium inlet end pipe 12 / the medium outlet end pipe 13, so that the valve cavity is in a connected state, and the ball core 2 synchronously drives the jacking block 52 and the upper mounting plate 51 to rotate, thereby driving the lower mounting plate 53 to rotate synchronously through the guide rod 54, and the rotation of the lower mounting plate 53 drives The second drive shaft 64 is driven to rotate coaxially, and the first transmission rod 651 is synchronously driven to rotate through the first bevel gear 641 and the second bevel gear 653. The first transmission rod 651 drives the shift lever 654 to rotate through the acceleration gear set 655. The shift lever 654 drives the second transmission rod 652 to rotate through the synchronous gear set 656 to realize the rotation of the transmission gear 66. When the valve stem 3 rotates 90°, the rotation angle of the transmission gear 66 is increased through the shift lever 654, thereby increasing the movement stroke of the first rack 68 and the second rack 60, so as to realize the complete closure of the outlet of the first flow channel 15 and the complete opening of the inlet of the second flow channel 16.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A top-loading cryogenic ball valve with high self-adjustment at the center of the ball core, characterized in that: The invention comprises a valve body (1) having a valve cavity, a ball core (2) installed in the valve cavity to control the opening and closing of the valve cavity, a valve stem (3) arranged on the ball core (2), and a valve cover (4) covering the upper opening of the valve body (1), the valve stem (3) being rotatably inserted through the valve cover (4), the two sides of the valve body (1) respectively having an inlet medium end pipe (12) and an outlet medium end pipe (13) connected to the valve cavity, the inner wall of the valve body (1) being provided with a valve seat (11) abutting against the ball core (2), the lower part of the valve body (1) having a loading cavity (14) connected to the valve cavity, and the valve body (1) A loading assembly (5) is provided inside a loading chamber (14), the loading assembly (5) comprising a lifting block (52) connected to the inner wall of the loading chamber (14) in a vertical sliding manner to support the bottom end of the ball core (2), and a first elastic member forcing the lifting block (52) to move upward under normal conditions, a first flow channel (15) is connected between the inner cavity of the medium inlet end pipe (12) and the loading chamber (14), and the medium outlet of the first flow channel (15) is located below the lifting block (52); the inner cavity of the medium outlet end pipe (13) and the loading chamber (14) are connected to each other. The loading chamber (14) is connected to a secondary flow channel (16), the medium inlet of the secondary flow channel (16) is located below the lifting block (52), the valve body (1) is slidably connected to a first sealing plate (17) for controlling the opening and closing of the medium outlet of the first flow channel (15) and a second sealing plate (18) for controlling the opening and closing of the medium inlet of the secondary flow channel (16), the loading assembly (5) further comprising an upper mounting plate (51) fixedly connected to the lower end surface of the lifting block (52), the lower end surface of the upper mounting plate (51) being coaxially provided with a mounting hole The upper mounting plate (51) is provided with a purge plate (56) connected to the mounting groove (511) in a vertical sliding manner, the purge plate (56) having a purge cavity (561), an upper end surface of the purge plate (56) being provided with an air outlet (562) connected to the purge cavity (561), and the ball core (2) being provided with a purge control member (7) for controlling the downward movement of the purge plate (56), and under normal conditions, the upper end surface of the purge plate (56) abuts against the top inner wall of the mounting groove (511) so that the air outlet (562) is in a closed state.

2. A top-loading cryogenic ball valve with high self-adjustment at the center of the ball core according to claim 1, characterized in that: The loading assembly (5) further comprises a lower mounting plate (53) located below the upper mounting plate (51) and arranged at the lower part of the loading chamber (14); the first elastic member is a first spring (55); the upper end of the first spring (55) abuts against or is fixedly connected to the lower end surface of the upper mounting plate (51); the lower end of the first spring (55) abuts against or is fixedly connected to the upper end surface of the lower mounting plate (53); and the first spring (55) always remains in a compressed state.

3. A top-loading cryogenic ball valve with high self-adjustment at the center of the ball core according to claim 2, characterized in that: The bottom of the ball core (2) is coaxially and vertically provided with a rotation-stop groove (21), the cross section of the rotation-stop groove (21) is polygonal, the cross section of the lifting block (52) is correspondingly polygonal, the lifting block (52) is inserted into the rotation-stop groove (21), the upper mounting plate (51) and the lower mounting plate (53) are both coaxially rotatably connected to the inner wall of the loading chamber (14), the loading assembly (5) further comprises a guide rod (54) arranged between the upper mounting plate (51) and the lower mounting plate (53), the lower end of the guide rod (54) is fixedly connected to the upper end surface of the lower mounting plate (53), the upper end of the guide rod (54) is slidably penetrated through the upper mounting plate (51), the first sealing plate (17) and the second sealing plate (18) are both vertically slidably connected to the inner wall of the loading chamber (14), and the lower mounting plate (53) is provided with a linkage mechanism (6) for synchronously driving the first sealing plate (17) and the second sealing plate (18) to slide in opposite directions.

4. A top-loading cryogenic ball valve with high self-adjustment at the center of the ball core according to claim 3, characterized in that: The linkage mechanism (6) comprises a first drive shaft (61) coaxially fixedly connected to the upper end surface of the lower mounting plate (53), a first connecting rod (62) protrudingly fixedly connected to the first sealing plate (17), and a second connecting rod (63) protrudingly fixedly connected to the second sealing plate (18). The outer peripheral wall of the first drive shaft (61) is provided with a first guide groove (611) and a second guide groove (612). Both the first guide groove (611) and the second guide groove (612) are spiral grooves. The first guide groove (611) and the second guide groove (612) have opposite rotation directions. The end of the first connecting rod (62) is slidably inserted into the first guide groove (611), and the end of the second connecting rod (63) is slidably inserted into the second guide groove (612).

5. The ball core center high self-adjusting top-entry cryogenic ball valve according to claim 3 is characterized by: The bottom inner wall of the loading chamber (14) is fixedly connected to a bracket (19), the lower mounting plate (53) is coaxially rotatably connected to the bracket (19), and the linkage mechanism (6) comprises a second drive shaft (64) coaxially fixedly arranged through the lower mounting plate (53), a linkage rod (65) located below the second drive shaft (64) and rotatably connected to the inner wall of the loading chamber (14) / the bracket (19), a transmission gear (66) coaxially fixedly sleeved on the linkage rod (65), a third connecting rod (67) fixedly connected to the first sealing plate (17), and a third connecting rod (68) fixedly arranged on the first sealing plate (17). A first rack (68) connected to the end of the third connecting rod (67), a fourth connecting rod (69) fixedly connected to the second sealing plate (18), and a second rack (60) fixedly connected to the end of the fourth connecting rod (69), the axial direction of the linkage rod (65) is horizontally arranged, the linkage rod (65) and the second drive shaft (64) are meshed and driven by a bevel gear set, the transmission gear (66) is located between the first rack (68) and the second rack (60), and the first rack (68) and the second rack (60) are both meshed with the transmission gear (66).

6. The ball core center high self-adjusting top-entry cryogenic ball valve according to claim 5, characterized in that: The linkage rod (65) comprises a first transmission rod (651) rotatably connected to the inner wall of one side of the loading chamber (14) and a second transmission rod (652) rotatably connected to the inner wall of the other side of the loading chamber (14); the bevel gear set comprises a first bevel gear (641) coaxially fixedly sleeved on the second drive shaft (64) and a second bevel gear (653) coaxially fixedly sleeved on the first transmission rod (651); the first bevel gear (641) meshes with the second bevel gear (653); a shift rod (654) is rotatably connected to the inner wall of the loading chamber (14); the shift rod (654) is parallel to the linkage rod (65); the shift rod (654) and the first transmission rod (651) are meshed and transmitted via an acceleration gear set (655); the shift rod (654) and the second transmission rod (652) are meshed and transmitted via a synchronizing gear set (656); the transmission gear (66) is coaxially fixedly sleeved on the second transmission rod (652).

7. The ball core center high self-adjusting top-entry cryogenic ball valve according to claim 1 is characterized by: The purge control component (7) comprises a movable tube (71) coaxially fixedly connected to the upper end surface of the purge plate (56) and a second elastic component that drives the movable tube (71) to slide upward under normal conditions so that the upper end surface of the purge plate (56) abuts against the inner wall of the top of the mounting groove (511); the inner cavity of the movable tube (71) is connected to the purge cavity (561); the movable tube (71) coaxially slides through the lifting block (52), the ball core (2) and the valve stem (3); the upper part of the movable tube (71) protrudes from the upper end of the valve stem (3); and the movable tube (71) is externally connected to an air injection pump.

8. The ball core center high self-adjusting top-entry cryogenic ball valve according to claim 7 is characterized by: The upper portion of the movable tube (71) is fixedly connected to a mounting plate (73) located above the valve stem (3); the second elastic member is a second spring (72); the upper end of the second spring (72) is fixedly connected to the lower end surface of the mounting plate (73); the lower end of the second spring (72) is fixedly connected to the upper end surface of the valve stem (3); the second spring (72) is in a compressed state, maintaining a vertical sliding lifting force on the mounting plate (73), so that the upper end surface of the purge plate (56) abuts against the top inner wall of the mounting groove (511).

9. The ball core center high self-adjusting top-entry cryogenic ball valve according to claim 8, characterized in that: A protective baffle (22) is integrally fixed to the inner wall of the through hole of the ball core (2) for dividing the through hole into two channels, and the protective baffle (22) has a sliding cavity (23) for the movable tube (71) to slide through.

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