Low-temperature ball valve and using method thereof

Abstract

The invention discloses a low-temperature ball valve and a using method thereof. The ball valve comprises a valve body, a ball core and a valve rod. A fixed disc with a through hole is fixed on the valve rod; the valve rod and the ball core can relatively rotate by a certain angle and rotate together with the ball core at the limiting position of rotation. The valve cover is provided with a second inner cavity communicated with the middle cavity and a pair of first inner cavities, and the valve body is provided with a closed pipeline connected to the middle cavity and the upstream of the valve body; when the valve rod is located at the first limit position A, the through hole communicates with one first inner cavity of the valve rod for pressure relief. When the valve rod is located at the position B, the through hole communicates with the second inner cavity, and the pipeline is opened for exhausting; when the valve rod is located at a second limit position C, the through hole is communicated with the other first inner cavity for pressure relief; pressure relief treatment can be conducted on the middle cavity when the ball core is closed and opened, exhaust treatment can be conducted on the middle cavity, vaporized low-temperature gas in the middle cavity is reduced, and damage to a pipeline caused by the fact that the low-temperature gas enters the pipeline is avoided.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a cryogenic ball valve and a use method thereof. Background Art

[0002] In the pipeline for transporting cryogenic liquids, the ball valve is an important fluid control component, which mainly includes a valve body, a ball core and a valve seat located in the valve body, and a valve cover located on the valve body. The opening and closing of the ball valve is driven by the valve, so that the ball core rotates around the axis of the valve stem, and the channel of the ball core is perpendicular or aligned with the pipeline axis to achieve the interception and circulation of the fluid;

[0003] When the ball core rotates to open and close the channel, low-temperature liquid will be intercepted in the middle cavity of the valve body. Affected by the ambient temperature, the low-temperature liquid is prone to vaporization, which increases the pressure in the middle cavity, resulting in a reduction in the service life of the corresponding seal or overall functional failure;

[0004] In response to the above problems, some ball valves release pressure through special structures, such as the Chinese utility model patent with publication number CN213839648U: a middle cavity self-unloading low-temperature ball valve, which discloses a technical solution: a pressure relief channel 7 is provided at the bottom of the valve stem 145, one end of which extends downward and is connected to the fluid channel 8 on the ball 4. The high-pressure medium in the ball installation cavity is released through the pressure relief channel 7 to the environment with lower pressure in the fluid channel; the sealing structure composed of the coil spring and the C-type sleeve can also facilitate the pressure relief after the medium pressure in the ball installation cavity increases. Although the above-disclosed technical solution that the ball installation cavity (middle cavity) can release pressure when the ball is in the passage or disconnection, this pressure relief is mainly between the ball installation cavity and the fluid channel;

[0005] The following problems exist in the actual use of ball valves: when the ball valve is closed or opened, the middle cavity is in a closed state, and the vaporization of the low-temperature liquid increases the pressure in the middle cavity. At this time, the middle cavity includes the low-temperature liquid and the vaporized low-temperature gas, and the low-temperature gas accumulates above the low-temperature liquid; when the ball valve is opened and closed, the middle cavity will be connected to the channel of the valve body. At this time, the low-temperature gas will enter the pipeline with the fluid to form bubbles or cavitations and block the flow path of the liquid, or cause turbulence and eddy currents of the liquid to affect the delivery effect. In addition, the gas accumulated in the pipeline may cause water hammer and damage the pipeline system. Summary of the invention

[0006] The purpose of the present invention is to provide a low-temperature ball valve, which can not only relieve the pressure of the middle cavity when the ball core is closed or open, but also exhaust the gas in the middle cavity, thereby reducing the vaporized low-temperature gas in the middle cavity and preventing the low-temperature gas from entering the pipeline during the opening and closing process of the ball core, thereby causing damage to the pipeline system or a decrease in the transportation efficiency.

[0007] To achieve the above purpose, the present invention provides a cryogenic ball valve, comprising:

[0008] Valve body, ball core, valve stem;

[0009] The ball core is installed in the middle cavity of the valve body to open and close the passage of the valve body. The middle cavity of the valve body is sealed by a valve cover installed on the valve body, and the lower end of the valve stem is connected to the ball core;

[0010] A fixed plate located in the middle cavity is fixed on the valve stem; the valve stem and the ball core can rotate relative to each other at a certain angle and rotate with the ball core at the extreme position of rotation;

[0011] The valve cover is provided with a second inner cavity connected to the middle cavity and a pair of first inner cavities, and the lower ends of the first inner cavity and the second inner cavity can be closed by a fixed disk; the fixed disk is provided with a through hole, and the valve body is provided with a closed pipeline connected between the middle cavity and the upstream of the valve body;

[0012] When the valve stem is at the first limit position A and the ball core closes the valve body channel, the through hole is connected to one of its first inner cavities and the fixed disk closes the second inner cavity; when the valve stem is at position B between the first limit position A and the second limit position C, the through hole is connected to the second inner cavity and the pipeline is opened, and the fixed disk closes the first inner cavity; when the valve stem is at the second limit position C and the ball core opens the valve body channel, the through hole is connected to the other first inner cavity and the fixed disk closes the second inner cavity;

[0013] Also includes:

[0014] A pressure relief component located in the first inner cavity and used to relieve pressure in the first inner cavity after being subjected to a certain pressure;

[0015] And an exhaust component located in the second inner cavity and used for exhausting the gas in the middle cavity and intercepting the cryogenic liquid.

[0016] In some examples of the present invention, the pressure relief component includes:

[0017] A pressing block and a first elastic member;

[0018] The lower end of the first elastic member is in contact with the pressing block and is in a compressed state. Under the action of the first elastic member, the pressing block seals the bottom end of the first inner cavity;

[0019] The upper end of the first inner cavity is communicated with the outside through the first catheter.

[0020] In some examples of the present invention, the exhaust component includes:

[0021] A float slides up and down in the second inner cavity due to the buoyancy of the liquid, and the upper and lower end surfaces of the float can respectively seal the upper and lower ends of the second inner cavity;

[0022] The lower end of the second inner cavity is connected to the middle cavity through the first hole, and the upper end is connected to the outside through the second hole; a vent hole is provided on the float to connect the upper and lower ends of the float; the diameters of the coaxially arranged first hole and second hole are smaller than the inner diameter of the second inner cavity, and the lower end of the vent hole is located inside the first hole, and the upper end is located outside the second hole.

[0023] In some examples of the present invention, a fixing block is arranged at the upper end of the second inner cavity, and the second hole passes through the middle of the fixing block from top to bottom;

[0024] The upper end of the float is a conical structure and matches with the conical hole at the lower end of the fixed block, and the lower end is a hemispherical or conical structure and matches with the lower end of the second inner cavity.

[0025] In some examples of the present invention, the valve body is provided with a control valve for opening and closing the pipeline and connected to the controller;

[0026] A sensing element for identifying the rotation position of the fixed disk is arranged in the middle cavity; after receiving the signal from the sensing element, the controller controls the control valve to open and close.

[0027] In some examples of the present invention, the valve body is provided with a third inner cavity, and the third inner cavity is connected with the middle cavity through a connecting hole;

[0028] The third inner cavity is provided with a sliding push rod and a second elastic member in a compressed state; the inner end of the push rod passes through the connecting hole and is located in the middle cavity, and the middle part is sealed by the second elastic member to the connecting hole;

[0029] A protrusion is provided on the peripheral side of the fixed plate, which can act on the push rod to move the push rod to open the connecting hole;

[0030] The pipeline is connected between the third inner cavity and the upstream of the pipeline.

[0031] In some examples of the present invention, a cylinder is provided on the core, and a first solid block with an arc structure is provided at the bottom end of the cylinder;

[0032] A second solid block is provided at the lower end of the valve stem;

[0033] When the valve stem and the ball core rotate relative to each other to an extreme position, the first solid block and the second solid block contact and limit the position.

[0034] In some examples of the present invention, the lower end of the valve stem is sleeved with a third elastic member and a cover plate;

[0035] The cover plate sealing cover is arranged on the cylinder body;

[0036] The third elastic member is located in the cylinder and is in a compressed state and acts on the lower end of the valve stem.

[0037] In some examples of the present invention, the valve cover is provided with three markings;

[0038] The three marks are respectively located at the first limit position A, the second limit position C, and the position B of the valve stem relative to the ball core.

[0039] The present invention also aims to provide a method for using a cryogenic ball valve, wherein the valve stem and the ball core can rotate relative to each other at a certain angle and rotate with the ball core at the extreme position of rotation, so that a pair of first inner cavities are connected with the middle cavity at the extreme position of rotation, and the second inner cavity is connected with the middle cavity at the B position of relative rotation. Not only can the middle cavity be pressure-relieved when the ball core is closed or open, but the middle cavity can also be vented to reduce the vaporized low-temperature gas in the middle cavity, thereby preventing the low-temperature gas from entering the pipeline during the opening and closing process of the ball core, thereby damaging the pipeline system or reducing the transportation efficiency.

[0040] A method for using a cryogenic ball valve comprises the following steps:

[0041] S1, the valve stem drives the ball core to rotate, so that the ball core opens and closes the valve body channel;

[0042] When the ball core closes the valve body channel and the valve stem rotates to the first extreme position A relative to the ball core, the through hole on the fixed disk docks with one of the first inner cavities and opens, and the fixed disk staggers and closes the second inner cavity. The low-temperature liquid trapped in the middle cavity of the valve body increases the pressure in the middle cavity. At this time, the pressure relief component in the first inner cavity works to complete the pressure relief action;

[0043] S2, when the valve stem rotates to position B relative to the ball core, the ball core still closes the valve body channel, the through hole on the fixed disk is staggered and closed with the first inner cavity, but is docked and opened with the second inner cavity, and the pipeline is connected;

[0044] The low-temperature gas vaporized in the middle cavity can be discharged from the middle cavity, the first hole, and the vent hole on the float to the top of the float, and then discharged from the second hole to complete the exhaust action; at the same time, the pipeline is opened, and the low-temperature liquid upstream of the valve body enters the middle cavity to fill the exhaust space in the middle cavity. As the liquid in the middle cavity increases, the float gradually moves upward due to the buoyancy of the liquid until the float closes the upper end of the second inner cavity, and the upper end of the vent hole is also blocked, so that the liquid cannot be discharged;

[0045] S3, when the valve stem rotates to the second extreme position C relative to the ball core and drives the ball core valve body channel to open, the through hole on the fixed disk docks with the other first inner cavity to open, and the fixed disk staggers and closes the second inner cavity. The low-temperature liquid trapped in the middle cavity of the valve body increases the pressure in the middle cavity. At this time, the pressure relief component in the first inner cavity works to complete the pressure relief action;

[0046] S4, when the valve stem rotates in the opposite direction relative to the ball core to position B, the ball core still opens the valve body channel, the second inner cavity is connected and opened with the through hole of the fixed plate, part of the liquid in the second inner cavity enters the middle cavity, the float falls to seal the lower end of the second inner cavity, the gas is then discharged from the vent hole, and the pipeline is replenished with liquid until the float moves upward again to seal;

[0047] S5, the valve stem continues to rotate in the opposite direction relative to the ball core to the first extreme position A, and drives the ball core valve body channel to close, the through hole on the fixed disk docks with one of the first inner chambers to open, the fixed disk staggers and closes the second inner chamber, and the low-temperature liquid trapped in the middle chamber of the valve body increases the pressure in the middle chamber. At this time, the pressure relief component in the first inner chamber works to complete the pressure relief action;

[0048] Steps S1-S5 are thus looped.

[0049] Compared with the prior art, the low-temperature ball valve of the present invention can rotate a certain angle relative to the ball core through the valve stem and the ball core and rotate with the ball core at the extreme position of rotation, so that a pair of first inner chambers are connected with the middle chamber at the extreme position of rotation, and the second inner chamber is connected with the middle chamber at the B position of relative rotation. Therefore, without affecting the opening and closing of the ball core by the valve stem, not only can the middle chamber be depressurized when the ball core is closed or opened, so as to avoid the increase of pressure in the middle chamber and the reduction of the service life of the corresponding sealing component or the overall functional failure, but also the middle chamber can be vented when the valve stem and the ball core are at the B position of relative rotation, so as to reduce the vaporized low-temperature gas in the middle chamber and avoid the low-temperature gas entering the pipeline during the opening and closing process of the ball core and causing damage to the pipeline system or a decrease in the transportation efficiency. In addition, when venting at the B position, it can stay for a certain time according to the actual situation to ensure that the middle chamber is vented, or the valve stem can be quickly rotated beyond the B position without venting, which is suitable for different use environments.

[0050] The push rod is in contact with the protrusion on the peripheral side of the fixed disk, so that the push rod moves radially outward to open the connecting hole, so that the liquid upstream of the valve body enters the third inner cavity, the connecting hole and the middle cavity from the pipeline, thereby completing the liquid replenishment of the middle cavity. When the push rod is staggered with the protrusion, the push rod re-closes the connecting hole under the action of the second elastic member. The overall structure is simple and compact, and the pipeline is connected as the through hole and the second inner cavity are connected and opened, which is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is the overall front view of the present invention;

[0052] Figure 2 It is a structural front view of the exhaust components and pipelines in the present invention;

[0053] Figure 3is a front view of the exhaust component of the present invention located in the second inner cavity;

[0054] Figure 4 is a front view of the pressure relief component in the present invention located in the first inner cavity;

[0055] Figure 5 It is an exploded view of the assembly of the valve stem and the ball core, and the assembly of the fixed plate and the valve cover in the present invention;

[0056] Figure 6 It is an exploded view of the assembly of the valve stem and the ball core in the present invention;

[0057] Figure 7 It is a schematic top view of the valve stem in the present invention when it is rotated relative to the ball core and is located at the first extreme position A;

[0058] Figure 8 It is a schematic top view of the valve stem rotating relative to the ball core and located at position B in the present invention;

[0059] Fig. 9 It is a schematic top view of the valve stem rotating relative to the ball core at the second extreme position C in the present invention;

[0060] In the figure: 11, valve body, 111, second elastic member, 112, third inner cavity, 113, ejector rod, 114, pipeline;

[0061] 12, core, 121, cylinder, 122, first solid block;

[0062] 13. Valve seat;

[0063] 14. valve stem, 141. second solid block;

[0064] 15. a third elastic member, 16. a cover plate;

[0065] 20. fixing plate, 21. through hole, 22. protrusion;

[0066] 30. valve cover, 31. first inner cavity, 32. second inner cavity;

[0067] 40. exhaust component, 41. float, 42. vent hole, 43. second conduit, 44. fixing block, 45. first hole, 46. second hole;

[0068] 50. Pressure relief component, 51. Pressing block, 52. First elastic member, 53. First conduit. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described 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.

[0070] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0071] like Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, the present invention relates to a cryogenic ball valve, comprising:

[0072] Valve body 11, ball core 12, valve stem 14;

[0073] The ball core 12 is installed in the middle cavity of the valve body 11 to open and close the channel of the valve body 11. The middle cavity of the valve body 11 is sealed by a valve cover 30 installed on the valve body 11. The lower end of the valve stem 14 is connected to the ball core 12. It is characterized in that:

[0074] A fixed plate 20 located in the middle cavity is fixed on the valve stem 14; the valve stem 14 and the ball core 12 can rotate relative to each other at a certain angle and rotate with the ball core 12 at the extreme position of rotation;

[0075] The valve cover 30 is provided with a second inner cavity 32 communicating with the middle cavity and a pair of first inner cavities 31. The lower ends of the first inner cavity 31 and the second inner cavity 32 can be closed by the fixing disk 20. The fixing disk 20 is provided with a through hole 21. The valve body 11 is provided with a closed pipeline 114 connecting the middle cavity and the upstream of the valve body 11.

[0076] When the valve stem 14 is located at the first limit position and the ball core 12 closes the passage to the valve body 11, the through hole 21 is connected to one of the first inner cavities 31 and the fixed disk 20 closes the second inner cavity 32; when the valve stem 14 is located at the B position between the first limit position A and the second limit position C, the through hole 21 is connected to the second inner cavity 32 and the pipeline 114 is opened, and the fixed disk 20 closes the pair of first inner cavities 31; when the valve stem 14 is located at the second limit position and the ball core 12 opens the passage to the valve body 11, the through hole 21 is connected to the other first inner cavity 31 and the fixed disk 20 closes the second inner cavity 32;

[0077] The present cryogenic ball valve also includes:

[0078] A pressure relief component 50 located in the first inner cavity 31 and used to open and relieve pressure in the first inner cavity 31 after being subjected to a certain pressure;

[0079] and an exhaust component 40 located in the second inner cavity 32 and used to exhaust the gas in the middle cavity and intercept the cryogenic liquid;

[0080] Specifically, the valve body 11, the ball core 12, the valve stem 14, and the valve cover 30 are important components of the existing ball valve. For example, the valve body 11 is provided with a central cavity for placing the valve seat 13 and the ball core 12. The ball core 12 contacts the valve seat 13 for opening and closing, so that the channel on the ball core 12 is perpendicular or aligned with the pipeline axis, completing the interception and circulation of the fluid, which will not be further elaborated here;

[0081] The lower end of the valve stem 14 and the ball core 12 can rotate relative to each other at a certain angle, and then drive the ball core 12 to rotate to open and close the channel;

[0082] A pair of first inner chambers 31 are located at the extreme positions of relative rotation between the valve stem 14 and the ball core 12, and the second inner chamber 32 is located at a position between the extreme positions;

[0083] The fixed disk 20 may be an integrated structure with the valve stem 14, and the through hole 21 thereon and the first inner cavity 31 and the second inner cavity 32 are located on the same circumference with the axis of the valve stem 14 as the center, so as to ensure that the through hole 21 can be connected with the first inner cavity 31 and the second inner cavity 32 respectively when the fixed disk 20 rotates, and a sealing ring may be provided on the upper end surface of the fixed disk 20 to prevent leakage of liquid or gas in the middle cavity when the first inner cavity 31 and the second inner cavity 32 are closed;

[0084] When the through hole 21 on the fixed disk 20 is connected to the second inner cavity 32, the pipeline 114 connects the middle cavity and the upstream of the valve body 11;

[0085] like Figures 7 to 9 As shown, the relative rotation angle between the valve stem 14 and the ball core 12 is defined as 180°, at which time 0° and 180° are the extreme positions of the rotation of the valve stem 14;

[0086] The cryogenic ball valve is assembled on the cryogenic liquid delivery pipeline, and the valve stem 14 drives the ball core 12 to rotate, so that the ball core 12 opens and closes the valve body 11 channel. Figure 7 As shown, when the valve stem 14 is at the 0° position relative to the ball core 12, that is, at the first extreme position A, the ball core 12 closes the passage of the valve body 11, the through hole 21 on the fixed disk 20 is docked with the first inner cavity 31 and opened, and the second inner cavity 32 is staggered and closed, and the trapped cryogenic liquid is located in the middle cavity of the valve body 11. When the cryogenic liquid vaporizes and the pressure in the middle cavity increases, the pressure relief component 50 in the first inner cavity 31 works to open the first inner cavity 31, so that the air pressure in the middle cavity is relieved through the pressure relief component 50;

[0087] like Figure 8 As shown, when the valve stem 14 is at a certain angle between 0° and 180° relative to the ball core 12, such as 90°, that is, the valve stem 14 rotates to position B relative to the ball core 12, the ball core 12 still closes the passage of the valve body 11, the through hole 21 on the fixed disk 20 is staggered and closed with the first inner cavity 31, butt-jointed and opened with the second inner cavity 32, and the pipeline 114 is connected. At this time, the vaporized low-temperature gas in the middle cavity is discharged through the exhaust component 40 in the second inner cavity 32, the low-temperature gas in the middle cavity is reduced and the gas pressure is reduced. At this time The middle cavity is connected to the pipeline 114 upstream of the valve body 11, and the cryogenic liquid upstream of the valve body 11 enters the middle cavity from the pipeline 114 to accelerate the discharge of the cryogenic gas, and can replenish the space of the discharged cryogenic gas by replenishing the liquid. When the exhaust component 40 recognizes that the cryogenic liquid in the middle cavity reaches a certain level, the second inner cavity 32 is closed to complete the exhaust action of the middle cavity; it is explained that, affected by the delivery pressure and the flow of the fluid, the pressure upstream of the valve body 11 is relatively large and can enter the middle cavity with reduced pressure;

[0088] like Fig. 9 As shown, when the valve stem 14 is at a 180° position relative to the ball core 12, that is, at the second extreme position C, the through hole 21 on the fixed disk 20 is docked and opened with another first inner cavity 31, and the second inner cavity 32 is staggered and closed. At this time, the pressure relief component 50 in the first inner cavity 31 can relieve the pressure of the vaporized low-temperature liquid in the middle cavity; when the valve stem 14 continues to rotate, the valve stem 14 will drive the ball core 12 to open the passage of the valve body 11, and the low-temperature liquid is normally transported from the passage of the valve body 11, and the middle cavity of the valve body 11 is in a closed state. At this time, the relative position of the valve stem 14 and the ball core 12 remains unchanged, that is, the first inner cavity 31 is docked and opened with the through hole 21 of the fixed disk 20, and the pressure relief component 50 can continue to relieve pressure; it is explained that the gas discharged through the pressure relief component 50 and the exhaust component 40 can be uniformly collected by the corresponding components to avoid the influence of the low-temperature gas vaporized by the transportation of toxic and harmful low-temperature liquid on the surrounding environment;

[0089] On the contrary, when the valve stem 14 rotates in the opposite direction to the ball core 12 to a 90° position, i.e., position B, the through hole 21 on the fixed disk 20 is staggered and closed with the first inner cavity 31, butted and opened with the second inner cavity 32, and the pipeline 114 is connected, and the exhaust component 40 can exhaust the middle cavity. When the valve stem 14 rotates in the opposite direction to the ball core 12 to a 0° position and continues to rotate in the opposite direction, the valve stem 14 drives the ball core 12 to close the passage of the valve body 11. At this time, the through hole 21 on the fixed disk 20 is butted and opened with the first inner cavity 31, butted and closed with the second inner cavity 32, and the pressure relief component 50 in the first inner cavity 31 continues to relieve pressure on the middle cavity.

[0090] The low-temperature ball valve can rotate relative to the ball core 12 by a certain angle through the valve stem 14 and rotate with the ball core 12 at the extreme position of rotation, so that a pair of first inner chambers 31 are respectively connected with the middle chamber at the extreme position of rotation, and the second inner chamber 32 is connected with the middle chamber at the B position of relative rotation. Therefore, without affecting the opening and closing of the ball core 12 by the valve stem 14, not only can the middle chamber be depressurized when the ball core 12 is closed or opened, so as to avoid the increase of the pressure in the middle chamber and the reduction of the service life of the corresponding sealing component or the overall function failure, but also the middle chamber can be vented at the B position of the relative rotation of the valve stem 14 and the ball core 12 to reduce the vaporized low-temperature gas in the middle chamber, so as to avoid the low-temperature gas from entering the pipeline during the opening and closing process of the ball core 12 and causing damage to the pipeline system or reduction of the transportation efficiency.

[0091] In addition, during the opening process of the ball core 12, the valve stem 14 can rotate relative to the ball core 12. When exhausting at position B, it can stay for a certain time according to actual conditions to ensure that the middle cavity is exhausted, or the valve stem 14 can be quickly rotated beyond position B without exhausting.

[0092] In some examples of the present invention, Figure 4 As shown, the pressure relief component 50 includes:

[0093] A pressing block 51 and a first elastic member 52;

[0094] The lower end of the first elastic member 52 is in contact with the pressing block 51 and is in a compressed state. Under the action of the first elastic member 52, the pressing block 51 seals the bottom end of the first inner cavity 31;

[0095] The upper end of the first inner cavity 31 is connected to the outside through the first conduit 53;

[0096] Specifically, the first elastic member 52 can be a cylindrical spring, and the pressing block 51 seals the bottom end of the first inner cavity 31. Its shape can be hemispherical, rod-shaped, etc., which can be selected according to actual conditions;

[0097] Initially, the pressing block 51 closes the bottom end of the first inner cavity 31, and the middle cavity cannot release pressure. When the pressure in the middle cavity reaches a certain level, the pressing block 51 compresses the first elastic member 52, and the first inner cavity 31 is opened for pressure relief. When the pressure in the middle cavity drops, the pressing block 51 closes the bottom end of the first inner cavity 31 again under the action of the first elastic member 52.

[0098] As explained, a proper amount of gas discharged by the first conduit 53 through pressure relief can be collected by a collecting component.

[0099] In some examples of the present invention, Figure 2 , Figure 3 As shown, the exhaust component 40 includes:

[0100] The float 41 slides up and down in the second inner cavity 32 due to the buoyancy of the liquid;

[0101] The lower end of the second inner cavity 32 is connected to the middle cavity through the first hole 45, and the upper end is connected to the outside through the second hole 46;

[0102] The float 41 is provided with a vent hole 42 that connects the upper and lower ends of the float 41. The upper and lower end surfaces of the float 41 can respectively seal the upper and lower ends of the second inner cavity 32.

[0103] The diameters of the coaxially arranged first hole 45 and second hole 46 are smaller than the inner diameter of the second inner cavity 32 , and the lower end of the vent hole 42 is located inside the first hole 45 , and the upper end is located outside the second hole 46 ;

[0104] Specifically, the density of the float 41 is lower than the cryogenic liquid transported in the pipeline, so that the float 41 can be moved upward in the second inner cavity 32 by the liquid float 41;

[0105] In the initial state, the float 41 is located at the lower limit position of the second inner cavity 32 and closes the lower end of the second inner cavity 32. This closure can be done by blocking the first hole 45 by the weight of the float 41 or by adding auxiliary components such as magnet adsorption. The lower end of the vent hole 42 is located inside the first hole 45.

[0106] Since the float 41 is provided with a plurality of vents 42, when the valve stem 14 rotates to the B position relative to the ball core 12 so that the through hole 21 on the fixed disk 20 is docked and opened with the second inner cavity 32, the low-temperature gas vaporized in the middle cavity can be discharged from the middle cavity, the first hole 45, and the vent 42 on the float 41 to the top of the float 41, and then discharged from the second hole 46 to complete the exhaust action; at the same time, the pipeline 114 is opened, and the low-temperature liquid upstream of the valve body 11 enters the middle cavity to fill the exhaust space in the middle cavity. As the liquid in the middle cavity increases, the float 41 gradually moves upward due to the buoyancy of the liquid. When the float 41 moves to the extreme position at the upper end of the second inner cavity 32 and closes the upper end of the second inner cavity 32, the upper end of the vent 42 is also blocked, and the liquid cannot be discharged, thereby completing the exhaust of the gas in the middle cavity and the retention of liquid replenishment, thereby preventing the discharge of the liquid in the middle cavity;

[0107] After the exhaust is completed, the valve stem 14 rotates to the pressure relief position relative to the ball core 12, and the low-temperature liquid in the middle cavity continues to vaporize into low-temperature gas. When it rotates to the exhaust position again, that is, when the second inner cavity 32 is connected and opened with the through hole 21 of the fixed plate 20 through the first hole 45, part of the liquid in the second inner cavity 32 will enter the middle cavity, and the float 41 falls to seal the lower end of the second inner cavity 32, and the gas is then discharged from the vent hole 42, and the liquid is replenished until the float 41 moves upward again to block;

[0108] Preferably, Figure 2 , Figure 3 As shown, a fixing block 44 is arranged at the upper end of the second inner cavity 32, and a second hole 46 penetrating from top to bottom is provided on the fixing block 44;

[0109] The upper end of the float 41 is a conical structure and matches the conical hole at the lower end of the fixed block 44, and the lower end is a hemispherical or conical structure and matches the lower end of the second inner cavity 32;

[0110] Specifically, the fixing block 44 is connected to the outside world through the second conduit 43;

[0111] The upper end of the float 41 is a conical structure that can be better embedded in the conical hole of the fixed block 44, so that after the float 41 moves upward, the upper end of the second inner cavity 32 and the vent 42 are blocked; the lower end of the float 41 is a hemispherical or conical structure so that the float 41 can move upward stably under the buoyancy of the liquid.

[0112] When the valve stem 14 is located at position B between the first limit position A and the second limit position C, the through hole 21 is connected to the second inner cavity 32 and the pipeline 114 is opened, which is an embodiment of the pipeline 114 being opened and closed in linkage.

[0113] The valve body 11 is provided with an opening and closing member for opening and closing the pipeline 114;

[0114] The opening and closing member may be a control valve connected to the controller, and a sensing member for identifying the rotation position of the fixed disk 20 is provided in the middle cavity;

[0115] After receiving the signal from the sensor, the controller controls the control valve to open and close;

[0116] Specifically, a one-way valve may be provided on the pipeline 114 to flow from the upstream of the valve body 11 into the middle cavity;

[0117] The sensing element may be a position sensor, and a fixed object that can be identified by the sensing element may be provided on the peripheral side of the fixed disk 20;

[0118] When the fixed disk 20 rotates to a certain position so that the through hole 21 and the second inner cavity 32 are docked and opened, the sensor transmits a signal to the controller, and the controller controls the pipeline 114 to open;

[0119] In this example, automatic control is mainly used, which requires additional control units and sensing units, making the overall cost higher.

[0120] As another embodiment of the pipeline 114 being opened and closed in linkage, Figure 2 , Figure 3 As shown, the valve body 11 is provided with a third inner cavity 112, and the third inner cavity 112 is connected with the middle cavity through a connecting hole;

[0121] The third inner cavity 112 is provided with a sliding push rod 113 and a second elastic member 111 in a compressed state; the inner end of the push rod 113 passes through the connecting hole and is located in the middle cavity, and the middle part is closed by the second elastic member 111 to the connecting hole;

[0122] A protrusion 22 is provided on the peripheral side of the fixing plate 20, which can act on the push rod 113 to move the push rod 113 to open the connecting hole;

[0123] The pipeline 114 is connected between the third inner cavity 112 and the upstream of the pipeline;

[0124] Specifically, under the pressure of the second elastic member 111, the middle part of the push rod 113 closes the connection hole; when the valve stem 14 drives the fixed disk 20 to rotate to a certain position relative to the ball core 12, so that the through hole 21 and the second inner cavity 32 are connected and opened, the protrusion 22 on the peripheral side of the fixed disk 20 will move the push rod 113 radially outward and compress the second elastic member 111, and the connection hole is in an open state;

[0125] The liquid upstream of the valve body 11 enters the third inner cavity 112 from the pipeline 114 and then enters the middle cavity from the connecting hole, thereby completing the gas discharge and liquid replenishment in the middle cavity. When the valve stem 14 rotates so that the through hole 21 and the second inner cavity 32 are offset from each other, the protrusion 22 is offset from the push rod 113. Under the action of the second elastic member 111, the push rod 113 re-closes the connecting hole.

[0126] In this example, the push rod 113 contacts the protrusion 22 on the side of the fixed disk 20, so that the push rod 113 moves radially outward to open the connecting hole, so that the liquid upstream of the valve body 11 enters the third inner cavity 112, the connecting hole, and the middle cavity from the pipeline 114, thereby replenishing the middle cavity. When the push rod 113 is offset from the protrusion 22, the push rod 113 re-seals the connecting hole under the action of the second elastic member 111. The overall structure is simple and compact, and the pipeline 114 is connected as the through hole 21 and the second inner cavity 32 are connected and opened, which is more efficient.

[0127] In some examples of the present invention, Figure 5 , Figure 6 As shown, the core 12 is provided with a cylinder 121, and a first solid block 122 with an arc structure is provided at the bottom end of the cylinder 121;

[0128] A second solid block 141 is provided at the lower end of the valve stem 14;

[0129] When the valve stem 14 and the ball core 12 rotate relative to each other to the limit position, the first solid block 122 and the second solid block 141 contact and limit the position;

[0130] Specifically, the first solid block 122 of the cylinder 121 is an arc-shaped structure, so that the second solid block 141 at the lower end of the valve stem 14 can rotate relatively in other circumferential directions, and at the extreme rotation position, the first solid block 122 contacts the second solid block 141 for limiting, thereby realizing the simultaneous rotation of the valve stem 14 and the ball core 12.

[0131] In some examples of the present invention, Figure 6 As shown, the lower end of the valve stem 14 is sleeved with a third elastic member 15 and a cover plate 16;

[0132] The cover plate 16 sealing cover is arranged on the cylinder 121;

[0133] The third elastic member 15 is located in the cylinder 121 and is in a compressed state and acts on the lower end of the valve stem 14;

[0134] Specifically, the cover plate 16 seals the cylinder 121 and can be assembled by threaded connection and sealing ring. The third elastic member 15 can be a cylindrical spring, which acts between the cover plate 16 and the lower end of the valve stem 14, so that the valve stem 14 is axially pressed downward to prevent the axial movement of the valve stem 14 from causing the first solid block 122 and the second solid block 141 to be misaligned, thereby affecting the transmission between the valve stem 14 and the ball core 12.

[0135] In some examples of the present invention, the valve cover 30 is provided with three markings;

[0136] The three marks are respectively located at two extreme positions of the valve stem 14 rotating relative to the ball core 12, and at the position where the through hole 21 communicates with the second inner cavity 32;

[0137] Specifically, the marks may be marked with numbers or colors, so that the operator can operate according to the marks and rotate the corresponding angles.

[0138] The present invention provides a method for using a cryogenic ball valve, which specifically comprises the following steps:

[0139] S1, the valve stem 14 drives the ball core 12 to rotate, so that the ball core 12 opens and closes the channel of the valve body 11;

[0140] When the ball core 12 closes the passage of the valve body 11 and the valve stem 14 rotates to the first extreme position A relative to the ball core 12, the through hole 21 on the fixed disk 20 docks with one of the first inner chambers 31 and opens, and the second inner chamber 32 is staggered and closed, and the cryogenic liquid trapped in the middle chamber of the valve body 11 vaporizes, and the pressure in the middle chamber increases. At this time, the pressure relief component 50 in the first inner chamber 31 works to complete the pressure relief action;

[0141] S2, when the valve stem 14 rotates to position B relative to the ball core 12, the ball core 12 still closes the passage of the valve body 11, the through hole 21 on the fixed disk 20 is staggered and closed with the first inner cavity 31, butt-jointed and opened with the second inner cavity 32, and the pipeline 114 is connected;

[0142] The low-temperature gas vaporized in the middle cavity can be discharged from the middle cavity, the first hole 45, and the vent hole 42 on the float 41 to the top of the float 41, and then discharged from the second hole 46 to complete the exhaust action; at the same time, the pipeline 114 is opened, and the low-temperature liquid upstream of the valve body 11 enters the middle cavity to fill the exhaust space in the middle cavity. As the liquid in the middle cavity increases, the float 41 gradually moves upward due to the buoyancy of the liquid until the float 41 closes the upper end of the second inner cavity 32, and the upper end of the vent hole 42 is also blocked, so that the liquid cannot be discharged;

[0143] S3, when the valve stem 14 rotates to the second extreme position C relative to the ball core 12 and drives the ball core 12 and the valve body 11 channel to open, the through hole 21 on the fixed disk 20 docks with the other first inner cavity 31 and opens, and the second inner cavity 32 is staggered and closed, the low-temperature liquid trapped in the middle cavity of the valve body 11 vaporizes, and the pressure in the middle cavity increases. At this time, the pressure relief component 50 in the first inner cavity 31 works to complete the pressure relief action;

[0144] S4, when the valve stem 14 rotates in the opposite direction to the B position relative to the ball core 12, the ball core 12 still opens the passage of the valve body 11, and the second inner cavity 32 is connected and opened with the through hole 21 of the fixed disk 20, part of the liquid in the second inner cavity 32 enters the middle cavity, and the float 41 falls to seal the lower end of the second inner cavity 32, and the gas is then discharged from the vent hole 42, and the pipeline 114 is replenished with liquid until the float 41 moves upward again to block;

[0145] S5, the valve stem 14 continues to rotate in the opposite direction relative to the ball core 12 to the first extreme position A, and drives the ball core 12 to close the valve body 11 channel, the through hole 21 on the fixed disk 20 docks with one of the first inner chambers 31 to open, and the second inner chamber 32 is staggered and closed, the low-temperature liquid trapped in the middle chamber of the valve body 11 vaporizes, and the pressure in the middle chamber increases. At this time, the pressure relief component 50 in the first inner chamber 31 works to complete the pressure relief action;

[0146] Steps S1-S5 are thus looped.

[0147] An exemplary implementation of a cryogenic ball valve proposed in the present invention is described in detail above with reference to a preferred embodiment. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined in various ways without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A cryogenic ball valve, comprising: Valve body (11), ball core (12), valve stem (14); The ball core (12) is installed in the middle cavity of the valve body (11) to open and close the passage of the valve body (11); the middle cavity of the valve body (11) is sealed by a valve cover (30) installed on the valve body (11); and the lower end of the valve stem (14) is connected to the ball core (12); It is characterized in that A fixed disk (20) located in the middle cavity is fixed on the valve stem (14); the valve stem (14) and the ball core (12) can rotate relative to each other at a certain angle and rotate together with the ball core (12) at the extreme rotation position; The valve cover (30) is provided with a second inner cavity (32) communicating with the middle cavity and a pair of first inner cavities (31), and the lower ends of the first inner cavity (31) and the second inner cavity (32) can be closed by a fixed disk (20); the fixed disk (20) is provided with a through hole (21), and the valve body (11) is provided with a closed pipeline (114) connecting the middle cavity and the upstream of the valve body (11); When the valve stem (14) is located at the first extreme position A and the ball core (12) closes the passage of the valve body (11), the through hole (21) is connected to one of the first inner cavities (31) and the fixed disk (20) closes the second inner cavity (32); when the valve stem (14) is located at position B between the first extreme position A and the second extreme position C, the through hole (21) is connected to the second inner cavity (32) and the pipeline (114) is opened, and the fixed disk (20) closes the pair of first inner cavities (31); when the valve stem (14) is located at the second extreme position C and the ball core (12) opens the passage of the valve body (11), the through hole (21) is connected to the other first inner cavity (31) and the fixed disk (20) closes the second inner cavity (32); Also includes: A pressure relief component (50) located in the first inner cavity (31) and used to relieve pressure in the first inner cavity (31) after being subjected to a certain pressure; and an exhaust component (40) located in the second inner cavity (32) and used for exhausting the gas in the middle cavity and intercepting the cryogenic liquid.

2. A cryogenic ball valve according to claim 1, characterized in that: The pressure relief component (50) comprises: A pressing block (51), a first elastic member (52); The lower end of the first elastic member (52) is in contact with the pressing block (51) and is in a compressed state. Under the action of the first elastic member (52), the pressing block (51) seals the bottom end of the first inner cavity (31); The upper end of the first inner cavity (31) is connected to the outside through a first conduit (53).

3. A cryogenic ball valve according to claim 1, characterized in that: The exhaust component (40) comprises: The float (41) slides up and down in the second inner cavity (32) due to the buoyancy of the liquid, and the upper and lower end surfaces of the float (41) can respectively seal the upper and lower ends of the second inner cavity (32); The lower end of the second inner cavity (32) is connected to the middle cavity through the first hole (45), and the upper end is connected to the outside through the second hole (46); the floating body (41) is provided with a vent hole (42) for connecting the upper and lower ends of the floating body (41); the diameters of the coaxially arranged first hole (45) and second hole (46) are smaller than the inner diameter of the second inner cavity (32); the lower end of the vent hole (42) is located inside the first hole (45), and the upper end is located outside the second hole (46).

4. A cryogenic ball valve according to claim 3, characterized in that: A fixing block (44) is arranged at the upper end of the second inner cavity (32), and a second hole (46) passes through the middle of the fixing block (44) from top to bottom; The upper end of the float (41) is a conical structure and matches the conical hole at the lower end of the fixed block (44), and the lower end is a hemispherical or conical structure and matches the lower end of the second inner cavity (32).

5. A cryogenic ball valve according to any one of claims 1 to 4, characterized in that: The valve body (11) is provided with a control valve for opening and closing the pipeline (114) and connected to a controller; A sensing element for identifying the rotation position of the fixed disk (20) is arranged in the middle cavity; after receiving the signal from the sensing element, the controller controls the control valve to open and close.

6. A cryogenic ball valve according to any one of claims 1 to 4, characterized in that: The valve body (11) is provided with a third inner cavity (112), and the third inner cavity (112) is connected with the middle cavity through a connecting hole; A slidably arranged push rod (113) and a second elastic member (111) in a compressed state are provided in the third inner cavity (112); the inner end of the push rod (113) passes through the connecting hole and is located in the middle cavity, and the middle part is sealed by the second elastic member (111) to the connecting hole; A protrusion (22) is provided on the peripheral side of the fixed plate (20) and is capable of acting on the push rod (113) to move the push rod (113) to open the connection hole; The pipeline (114) is connected between the third inner cavity (112) and the upstream of the pipeline.

7. A cryogenic ball valve according to any one of claims 1 to 4, characterized in that: The core (12) is provided with a cylinder (121), and a first solid block (122) with an arc-shaped structure is provided at the bottom end of the cylinder (121); A second solid block (141) is provided at the lower end of the valve stem (14); When the valve stem (14) and the ball core (12) rotate relative to each other to an extreme position, the first solid block (122) and the second solid block (141) contact and limit the position.

8. A cryogenic ball valve according to claim 7, characterized in that: The lower end of the valve stem (14) is sleeved with a third elastic member (15) and a cover plate (16); The cover plate (16) sealing cover is arranged on the cylinder body (121); The third elastic member (15) is located in the cylinder (121) and is in a compressed state, acting on the lower end of the valve stem (14).

9. The cryogenic ball valve according to claim 1, characterized in that: The valve cover (30) is provided with three markings; The three marks are respectively located at a first limit position A, a second limit position C, and a position B of the valve stem (14) rotating relative to the ball core (12).

10. A method for using the cryogenic ball valve according to claim 3, characterized in that: The specific steps include: S1, the valve stem (14) drives the ball core (12) to rotate, so that the ball core (12) opens and closes the passage of the valve body (11); When the ball core (12) closes the passage of the valve body (11) and the valve stem (14) rotates relative to the ball core (12) to the first extreme position A, the through hole (21) on the fixed disk (20) is connected to one of the first inner chambers (31) and opened, and the fixed disk (20) staggers and closes the second inner chamber (32), and the low-temperature liquid trapped in the middle chamber of the valve body (11) increases the pressure in the middle chamber. At this time, the pressure relief component (50) in the first inner chamber (31) works to complete the pressure relief action; S2, when the valve stem (14) rotates to position B relative to the ball core (12), the ball core (12) still closes the passage of the valve body (11), the through hole (21) on the fixed disk (20) is staggered and closed with the first inner cavity (31), butt-jointed and opened with the second inner cavity (32), and the pipeline (114) is connected; The low-temperature gas vaporized in the middle cavity can be discharged from the middle cavity, the first hole (45), and the vent hole (42) on the float (41) to the top of the float (41), and then discharged from the second hole (46), completing the exhaust action; at the same time, the pipeline (114) is opened, and the low-temperature liquid upstream of the valve body (11) enters the middle cavity to fill the exhaust space in the middle cavity. As the liquid in the middle cavity increases, the float (41) gradually moves upward due to the buoyancy of the liquid until the float (41) closes the upper end of the second inner cavity (32), and the upper end of the vent hole (42) is also blocked, so that the liquid cannot be discharged; S3, when the valve stem (14) rotates to the second extreme position C relative to the ball core (12) and drives the ball core (12) and the valve body (11) channel to open, the through hole (21) on the fixed disk (20) is docked and opened with the other first inner cavity (31), and the fixed disk (20) staggers and closes the second inner cavity (32), and the low-temperature liquid trapped in the middle cavity of the valve body (11) increases the pressure in the middle cavity. At this time, the pressure relief component (50) in the first inner cavity (31) works to complete the pressure relief action; S4, when the valve stem (14) rotates in the opposite direction relative to the ball core (12) to position B, the ball core (12) still opens the passage of the valve body (11), the second inner cavity (32) is connected and opened with the through hole (21) of the fixed disk (20), part of the liquid in the second inner cavity (32) enters the middle cavity, the float (41) falls to seal the lower end of the second inner cavity (32), the gas is then discharged from the vent hole (42), and the pipeline (114) is replenished with liquid until the float (41) moves upward again to seal; S5, after the valve stem (14) continues to rotate in the opposite direction relative to the ball core (12) to the first extreme position A and drives the ball core (12) and the valve body (11) passage to be closed, the through hole (21) on the fixed disk (20) is docked and opened with one of the first inner chambers (31), and the fixed disk (20) staggers and closes the second inner chamber (32), and the low-temperature liquid trapped in the middle chamber of the valve body (11) increases the pressure in the middle chamber. At this time, the pressure relief component (50) in the first inner chamber (31) works to complete the pressure relief action; Steps S1-S5 are thus looped.

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