Ultralow-temperature ball valve

Abstract

The utility model belongs to the technical field of ball valves, and particularly relates to an ultralow-temperature ball valve which comprises a valve body, a valve deck, a ball body, a valve seat, a valve rod and an operating mechanism used for controlling the valve rod, the valve body comprises a main valve body, an inlet valve body and an outlet valve body, the inlet valve body and the outlet valve body are arranged on the two sides of the main valve body, an inlet is formed in the inlet valve body, and an outlet is formed in the outlet valve body. The valve further comprises a sealing structure, and the sealing structure comprises a first sealing structure arranged between the main valve body and the inlet valve body and a second sealing structure arranged between the main valve body and the outlet valve body. The second sealing structure is arranged between the main valve body and the outlet valve body; wherein a sealing seat is further arranged at the bottom of the valve body. The valve has the beneficial effects that by arranging the first sealing structure and the second sealing structure, double sealing guarantee is achieved, ultralow-temperature fluid is effectively prevented from leaking at the joint of the valve, the safety and stability of a system are ensured, and meanwhile the service life of the valve is prolonged through the design of double sealing and the bottom sealing base.

Description

Technical Field

[0001] The present application belongs to the technical field of ball valves, and in particular relates to an ultra-low temperature ball valve. Background Art

[0002] Ultra-low temperature ball valve is a special ball valve, which is mainly used for fluid control in ultra-low temperature environment. In actual production and processing, it is usually used in pipeline systems of cryogenic media such as liquefied natural gas, liquid oxygen, and liquid nitrogen.

[0003] The patent with publication number CN114738546B discloses a top-mounted ultra-low temperature ball valve, including a valve body, wherein the outer walls on both sides of the valve body are respectively provided with an air inlet and an exhaust port, the top outer wall of the valve body is connected to a connecting seat by bolts, and the connecting seat is made of hollow material, the top inner wall of the connecting seat is provided with a fixing port, and the inner wall of the fixing port is rotatably connected to a rotating rod, the top outer wall of the rotating rod is connected to a rotating wheel by bolts, and an indicator groove is provided on one side of the top outer wall of the rotating wheel, the bottom outer wall of the rotating rod is provided with a sealing mechanism, and the bottom outer wall of the sealing mechanism is provided with a sphere, and a guide hole is provided between the outer walls on both sides of the sphere.

[0004] The above patent improves the sealing performance inside the ball valve by setting a sealing patch, but there is no corresponding sealing structure on both sides of the ball. The sealing effect of the ball is single and prone to leakage, which needs to be improved. Utility Model Content

[0005] The purpose of this application is to provide an ultra-low temperature ball valve that can solve the above problems.

[0006] The purpose of the present application is to provide a cryogenic ball valve, comprising a valve body, a valve cover, a ball, a valve seat, a valve stem and an operating mechanism for controlling the valve stem, wherein the valve body comprises a main valve body and an inlet valve body and an outlet valve body arranged on both sides of the main valve body, wherein the inlet valve body is provided with an inlet, and the outlet valve body is provided with an outlet, wherein a sealing structure is also included, and the sealing structure comprises:

[0007] A first sealing structure is provided between the main valve body and the inlet valve body;

[0008] A second sealing structure is provided between the main valve body and the outlet valve body;

[0009] Wherein, a sealing seat is also arranged at the bottom of the valve body.

[0010] By adopting the above-mentioned ultra-low temperature ball valve design, the first and second sealing structures are respectively set between the main valve body and the inlet valve body and the outlet valve body to achieve double sealing protection, effectively preventing the leakage of ultra-low temperature fluid at the valve connection, and ensuring the safety and stability of the system. The sealing seat added at the bottom of the valve body further enhances the overall sealing of the valve, making the valve suitable for the transmission system of ultra-low temperature media such as liquid nitrogen, liquid oxygen, and liquefied natural gas (LNG), meeting the needs of special industrial fields. At the same time, the service life of the valve is extended by the design of double seals and bottom sealing seats, and the frequency of maintenance and replacement due to leakage is reduced by improving the sealing performance, thereby reducing the operating cost.

[0011] Furthermore, the first sealing structure includes:

[0012] A first sealing ring is arranged in the inlet valve body, and a first sealing ring groove adapted to the first sealing ring is arranged in the inlet valve body;

[0013] The first mounting seat comprises a first seat body, a first protrusion arranged on one side of the first seat body and a first slot arranged on the other side of the first seat body, and a plurality of first mounting slots are arranged on the first seat body;

[0014] A first spring is disposed in the first mounting groove;

[0015] A first fixing ring, one side of which is provided with a second protrusion adapted to the first slot, and a second sealing ring is sleeved on the second protrusion;

[0016] Wherein, a first installation step adapted to the first protrusion is arranged on the inlet valve body.

[0017] The first sealing ring is arranged in the first sealing ring groove in the inlet valve body, ensuring that the sealing ring can fit tightly in the ring groove to form a preliminary sealing barrier. The material of the first sealing ring has good low temperature resistance, corrosion resistance and elasticity to meet the use requirements in ultra-low temperature environment. The first mounting seat integrates multiple components such as the first seat body, the first protrusion and the first slot, making the installation and sealing process more convenient and reliable. The first protrusion is adapted to the first installation step on the inlet valve body, and is fixed by tight fit, thereby enhancing the stability of the sealing structure. The first slot provides convenience for the installation of subsequent components (such as the first fixing ring), making the entire sealing structure more compact and integrated. The first spring arranged in the first mounting groove plays a role of close connection, and can also reduce the impact on the sealing ring, thereby protecting the sealing ring from damage and extending its service life. At the same time, the design of the first fixing ring enables the second sealing ring to be tightly sleeved on the second protrusion and form a second sealing barrier with the inlet valve body or related components, further improving the sealing effect and reducing the risk of leakage.

[0018] The first sealing structure achieves an efficient, reliable and low-temperature resistant sealing effect through the mutual cooperation of components such as the first sealing ring, the first mounting seat, the first spring and the first fixing ring, which not only improves the overall performance of the valve, but also extends its service life, providing important safety protection for the ultra-low temperature fluid transmission system.

[0019] Further: the first sealing structure also includes:

[0020] A first annular groove is provided on a side of the main valve body close to the inlet valve body;

[0021] A third sealing ring is disposed in the first annular groove;

[0022] A first limiting step is provided on the inlet valve body;

[0023] Among them, after the inlet valve body and the main valve body are matched, the first limiting step contacts the third sealing ring.

[0024] The first annular groove is arranged on the side of the main valve body close to the inlet valve body, providing an installation position for the third sealing ring, ensuring the installation of the third sealing ring, and forming an additional sealing barrier. The material of the third sealing ring is also resistant to low temperature, corrosion and has excellent sealing performance to adapt to the harsh conditions in ultra-low temperature environments, which further improves the reliability and durability of the sealing structure. The first limiting step is arranged on the inlet valve body. When the inlet valve body and the main valve body are installed in conjunction, the step will contact the third sealing ring, thereby enhancing the sealing effect. At the same time, combined with the above-mentioned first sealing ring, first sealing ring groove, first mounting seat and other components, the first sealing structure forms a multiple sealing mechanism, which improves the reliability and safety of the seal, and can maintain a stable sealing effect even under extreme working conditions.

[0025] Furthermore, the second sealing structure includes:

[0026] A fourth sealing ring is arranged in the outlet valve body, and a second sealing ring groove matching with the fourth sealing ring is arranged in the outlet valve body;

[0027] The second mounting seat comprises a second seat body, a third protrusion arranged on one side of the second seat body and a second slot arranged on the other side of the second seat body, and a plurality of second mounting slots are arranged on the second seat body;

[0028] A second spring is disposed in the second mounting groove;

[0029] A second fixing ring, one side of which is provided with a fourth protrusion adapted to the second slot, and a fifth sealing ring is sleeved on the fourth protrusion;

[0030] Wherein, a second installation step adapted to the third protrusion is arranged on the outlet valve body.

[0031] The fourth sealing ring is installed in the second sealing ring groove in the outlet valve body, which ensures the stability and sealing effect of the sealing ring. The second mounting seat integrates multiple components such as the second seat body, the third protrusion and the second slot, which effectively improves the installation and sealing process. The third protrusion is adapted to the second mounting step on the outlet valve body, and is fixed by close fit, thereby enhancing the stability of the sealing structure. The second slot provides convenience for the installation of subsequent components (such as the second fixing ring), which helps to achieve a tighter sealing connection. The second spring arranged in the second mounting groove plays a role of tight connection, and can also reduce the impact on the sealing ring, thereby protecting the sealing ring from damage and extending the service life. The design of the second fixing ring enables the fifth sealing ring to be tightly sleeved on the fourth protrusion and form a second sealing barrier with the outlet valve body or related components. This double sealing design further improves the sealing effect and reduces the risk of leakage. At the same time, the second sealing structure is similar to the first sealing structure in design and function, and both use a combination of components such as a sealing ring, a mounting seat, a spring and a fixing ring to achieve an efficient and reliable sealing effect. The consistency of the design helps to simplify the production and maintenance process and improve overall efficiency.

[0032] Furthermore, the second sealing structure further includes:

[0033] A second annular groove is provided on a side of the main valve body close to the outlet valve body;

[0034] a sixth sealing ring, disposed in the second annular groove;

[0035] A second limiting step is provided on the outlet valve body;

[0036] Among them, after the outlet valve body and the main valve body are matched, the second limiting step contacts the sixth sealing ring.

[0037] The second annular groove is arranged on the side of the main valve body close to the outlet valve body, providing a stable installation position for the sixth sealing ring, ensuring the installation of the sixth sealing ring, thereby effectively forming a sealing barrier. The second limiting step is arranged on the outlet valve body. When the outlet valve body and the main valve body are installed in conjunction, this step will come into contact with the sixth sealing ring, ensuring the sealing effect between the two, and effectively preventing the leakage of the medium between the two. At the same time, the second sealing structure forms a double sealing mechanism by combining the above-mentioned fourth sealing ring, the second sealing ring groove, and the current sixth sealing ring and the second limiting step, which not only improves the reliability of the seal, but also enhances the stability and durability of the valve in ultra-low temperature environments.

[0038] Furthermore, the sealing seat includes a sealing body and a plug rod arranged on the sealing body, a seventh sealing ring is sleeved on the plug rod, an eighth sealing ring is arranged on the top of the plug rod, and a sealing groove adapted to the sealing seat is arranged on the main valve body.

[0039] The plug rod is arranged on the sealing body, and its design enables the sealing seat to achieve a tight plug-in fit with the main valve body, and needs to be fixed by bolts after installation. The seventh sealing ring is sleeved on the plug rod, located on the contact surface between the sealing body and the main valve body, to prevent the medium from leaking from the gap between the plug rod and the main valve body. The eighth sealing ring is arranged on the top of the plug rod, forming contact with the main valve body, further enhancing the sealing effect.

[0040] The beneficial effects of this application are:

[0041] 1. By setting the first and second sealing structures, double sealing protection is achieved, which effectively prevents the leakage of ultra-low temperature fluid at the valve connection, ensuring the safety and stability of the system. At the same time, the design of double sealing and bottom sealing seat prolongs the service life of the valve. By improving the sealing performance, the frequency of maintenance and replacement caused by leakage is reduced, and the operating cost is reduced;

[0042] 2. The first sealing ring is arranged in the first sealing ring groove in the inlet valve body, ensuring that the sealing ring can fit tightly in the ring groove to form a preliminary sealing barrier. At the same time, the design of the first fixing ring enables the second sealing ring to be tightly sleeved on the second protrusion and form a second sealing barrier with the inlet valve body or related components, further improving the sealing effect and reducing the risk of leakage;

[0043] 3. The first annular groove is arranged on the side of the main valve body close to the inlet valve body, providing an installation position for the third sealing ring, ensuring the installation of the third sealing ring, and forming an additional sealing barrier. At the same time, combined with the above-mentioned first sealing ring, first sealing ring groove, first mounting seat and other components, the first sealing structure forms a multiple sealing mechanism, which improves the reliability and safety of the seal and can maintain a stable sealing effect even under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the utility model;

[0045] Figure 2 It is an exploded view of the utility model;

[0046] Figure 3 It is a structural schematic diagram of the first sealing structure and the inlet valve body of the utility model;

[0047] Figure 4 It is another structural schematic diagram of the first sealing structure and the inlet valve body of the utility model;

[0048] Figure 5 It is a structural schematic diagram of the second sealing structure and the outlet valve body of the utility model;

[0049] Figure 6This is another structural schematic diagram of the second sealing structure and the outlet valve body of the utility model;

[0050] Figure 7 It is a cross-sectional view of the main valve body of the utility model.

[0051] The reference numerals in the figure are: 100, main valve body; 110, inlet valve body; 120, outlet valve body; 130, valve cover; 140, ball; 160, valve stem; 170, operating mechanism; 200, first sealing structure; 210, first sealing ring; 211, first sealing ring groove; 220, first mounting seat; 221, first seat body; 222, first protrusion; 223, first slot; 224, first mounting groove; 230, first spring; 240, first fixing ring; 241, second protrusion; 242, second sealing ring; 250, first mounting step; 260, first annular groove; 270, third sealing ring; 2 80. First limiting step; 300. Second sealing structure; 310. Fourth sealing ring; 311. Second sealing ring groove; 320. Second mounting seat; 321. Second seat body; 322. Third protrusion; 323. Second slot; 324. Second mounting groove; 330. Second spring; 340. Second fixing ring; 341. Fourth protrusion; 342. Fifth sealing ring; 350. Second mounting step; 360. Second annular groove; 370. Sixth sealing ring; 380. Second limiting step; 400. Sealing seat; 410. Sealing body; 420. Insert rod; 430. Seventh sealing ring; 440. Eighth sealing ring. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0053] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0054] The ultra-low temperature ball valve provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0055] Embodiment 1:

[0056] like Figure 1-7 As shown, the embodiment of the present application provides a cryogenic ball valve, including a valve body, a valve cover 130, a ball 140, a valve seat, a valve stem 160 and an operating mechanism 170 for controlling the valve stem 160, the valve body includes a main valve body 100 and an inlet valve body 110 and an outlet valve body 120 arranged on both sides of the main valve body 100, and the inlet valve body 110 is provided with an inlet, and the outlet valve body 120 is provided with an outlet, wherein a sealing structure is also included, and the sealing structure includes:

[0057] The first sealing structure 200 is disposed between the main valve body 100 and the inlet valve body 110;

[0058] The second sealing structure 300 is disposed between the main valve body 100 and the outlet valve body 120;

[0059] A sealing seat 400 is also provided at the bottom of the valve body.

[0060] In some implementations of the embodiments of the present application, Figure 1 As shown, the above-mentioned cryogenic ball valve design is adopted, and the first and second sealing structures 300 are respectively arranged between the main valve body 100 and the inlet valve body 110 and the outlet valve body 120, so as to achieve double sealing protection, effectively prevent the leakage of the cryogenic fluid at the valve connection, and ensure the safety and stability of the system. The sealing seat 400 added at the bottom of the valve body further enhances the overall sealing of the valve, so that the valve can be applied to the transmission system of ultra-cold media such as liquid nitrogen, liquid oxygen, and liquefied natural gas (LNG), meeting the needs of special industrial fields. At the same time, the design of double sealing and bottom sealing seat 400 prolongs the service life of the valve, and through the improvement of sealing performance, the frequency of maintenance and replacement due to leakage is reduced, and the operating cost is reduced.

[0061] Embodiment 2:

[0062] An embodiment of the present application provides an ultra-low temperature ball valve. In addition to the above-mentioned technical features, the ultra-low temperature ball valve of the embodiment of the present application also includes the following technical features.

[0063] like Figure 1-4 as well as Figure 7 As shown, the first sealing structure 200 includes:

[0064] A first sealing ring 210 is disposed in the inlet valve body 110 , and a first sealing ring groove 211 adapted to the first sealing ring 210 is disposed in the inlet valve body 110 ;

[0065] The first mounting base 220 includes a first base body 221, a first protrusion 222 disposed on one side of the first base body 221, and a first slot 223 disposed on the other side of the first base body 221. The first base body 221 is provided with a plurality of first mounting grooves 224;

[0066] A first spring 230 is disposed in the first mounting groove 224;

[0067] A first fixing ring 240, one side of which is provided with a second protrusion 241 adapted to the first slot 223, and a second sealing ring 242 is sleeved on the second protrusion 241;

[0068] The inlet valve body 110 is provided with a first installation step 250 adapted to the first protrusion 222 .

[0069] In the embodiment of the present application, the first sealing ring 210 is arranged in the first sealing ring groove 211 in the inlet valve body 110, ensuring that the sealing ring can fit tightly in the ring groove to form a preliminary sealing barrier. The material of the first sealing ring 210 has good low temperature resistance, corrosion resistance and elasticity to meet the use requirements in ultra-low temperature environment. The first mounting seat 220 integrates multiple components such as the first seat body 221, the first protrusion 222 and the first slot 223, making the installation and sealing process more convenient and reliable. The first protrusion 222 is adapted to the first installation step 250 on the inlet valve body 110, and is fixed by close cooperation, thereby enhancing the stability of the sealing structure. The first slot 223 provides convenience for the installation of subsequent components (such as the first fixing ring 240), making the entire sealing structure more compact and integrated. The first spring 230 arranged in the first mounting groove 224 plays a role of close connection, and can also reduce the impact on the sealing ring, thereby protecting the sealing ring from damage and extending the service life. At the same time, the design of the first fixing ring 240 enables the second sealing ring 242 to be tightly mounted on the second protrusion 241 and form a second sealing barrier with the inlet valve body 110 or related components, further improving the sealing effect and reducing the risk of leakage.

[0070] The first sealing structure 200 achieves an efficient, reliable and low-temperature resistant sealing effect through the mutual cooperation of components such as the first sealing ring 210, the first mounting seat 220, the first spring 230 and the first fixing ring 240, which not only improves the overall performance of the valve, but also extends its service life, providing important safety protection for the ultra-low temperature fluid transmission system.

[0071] Furthermore, the first sealing structure 200 further comprises:

[0072] The first annular groove 260 is provided on one side of the main valve body 100 close to the inlet valve body 110;

[0073] A third sealing ring 270 is disposed in the first annular groove 260;

[0074] A first limiting step 280 is provided on the inlet valve body 110;

[0075] After the inlet valve body 110 is matched with the main valve body 100 , the first limiting step 280 is in contact with the third sealing ring 270 .

[0076] In some embodiments of the present application, the first annular groove 260 is arranged on the side of the main valve body 100 close to the inlet valve body 110, providing an installation position for the third sealing ring 270, ensuring the installation of the third sealing ring 270, and forming an additional sealing barrier. The material of the third sealing ring 270 also has low temperature resistance, corrosion resistance and excellent sealing performance to adapt to the harsh conditions in ultra-low temperature environment, which further improves the reliability and durability of the sealing structure. The first limiting step 280 is arranged on the inlet valve body 110. When the inlet valve body 110 is installed with the main valve body 100, the step will contact the third sealing ring 270, thereby enhancing the sealing effect. At the same time, combined with the above-mentioned first sealing ring 210, the first sealing ring groove 211, the first mounting seat 220 and other components, the first sealing structure 200 forms a multiple sealing mechanism, which improves the reliability and safety of the seal, and can maintain a stable sealing effect even under extreme working conditions.

[0077] Embodiment 3:

[0078] An embodiment of the present application provides an ultra-low temperature ball valve. In addition to the above-mentioned technical features, the ultra-low temperature ball valve of the embodiment of the present application also includes the following technical features.

[0079] like Figure 1-2 As shown in 4-7, the second sealing structure 300 includes:

[0080] The fourth sealing ring 310 is disposed in the outlet valve body 120 , and the outlet valve body 120 is provided with a second sealing ring groove 311 adapted to the fourth sealing ring 310 ;

[0081] The second mounting base 320 includes a second base body 321, a third protrusion 322 disposed on one side of the second base body 321, and a second slot 323 disposed on the other side of the second base body 321. The second base body 321 is provided with a plurality of second mounting grooves 324;

[0082] A second spring 330 is disposed in the second mounting groove 324;

[0083] A second fixing ring 340 is provided with a fourth protrusion 341 adapted to the second slot 323 on one side thereof, and a fifth sealing ring 342 is sleeved on the fourth protrusion 341;

[0084] The outlet valve body 120 is provided with a second installation step 350 adapted to the third protrusion 322 .

[0085] In the embodiment of the present application, the fourth sealing ring 310 is installed in the second sealing ring groove 311 in the outlet valve body 120, which ensures the stability and sealing effect of the sealing ring. The second mounting seat 320 integrates multiple components such as the second seat body 321, the third protrusion 322 and the second slot 323, which effectively improves the installation and sealing process. The third protrusion 322 is adapted to the second installation step 350 on the outlet valve body 120, and is fixed by close fit, thereby enhancing the stability of the sealing structure. The second slot 323 provides convenience for the installation of subsequent components (such as the second fixing ring 340), which helps to achieve a tighter sealing connection. The second spring 330 arranged in the second mounting groove 324 plays a role of tight connection, and can also reduce the impact on the sealing ring, thereby protecting the sealing ring from damage and extending the service life. The design of the second fixing ring 340 enables the fifth sealing ring 342 to be tightly sleeved on the fourth protrusion 341 and form a second sealing barrier with the outlet valve body 120 or related components. This double sealing design further improves the sealing effect and reduces the risk of leakage. At the same time, the second sealing structure 300 is similar to the first sealing structure 200 in design and function. Both use a combination of components such as a sealing ring, a mounting seat, a spring and a fixing ring to achieve an efficient and reliable sealing effect. The consistency of the design helps to simplify the production and maintenance process and improve overall efficiency.

[0086] Furthermore, the second sealing structure 300 further includes:

[0087] The second annular groove 360 ​​is disposed on one side of the main valve body 100 close to the outlet valve body 120;

[0088] A sixth sealing ring 370 is disposed in the second annular groove 360;

[0089] A second limiting step 380 is provided on the outlet valve body 120;

[0090] After the outlet valve body 120 is matched with the main valve body 100 , the second limiting step 380 is in contact with the sixth sealing ring 370 .

[0091] The second annular groove 360 ​​is arranged on the side of the main valve body 100 close to the outlet valve body 120, providing a stable installation position for the sixth sealing ring 370, ensuring the installation of the sixth sealing ring 370, thereby effectively forming a sealing barrier. The second limiting step 380 is arranged on the outlet valve body 120. When the outlet valve body 120 is installed in conjunction with the main valve body 100, this step will come into contact with the sixth sealing ring 370, ensuring the sealing effect between the two, and effectively preventing the leakage of the medium between the two. At the same time, the second sealing structure 300 forms a double sealing mechanism by combining the above-mentioned fourth sealing ring 310, the second sealing ring groove 311, and the current sixth sealing ring 370 and the second limiting step 380, which not only improves the reliability of the seal, but also enhances the stability and durability of the valve in an ultra-low temperature environment.

[0092] Embodiment 4:

[0093] An embodiment of the present application provides an ultra-low temperature ball valve. In addition to the above-mentioned technical features, the ultra-low temperature ball valve of the embodiment of the present application also includes the following technical features.

[0094] like Figure 2 As shown, the sealing seat 400 includes a sealing body 410 and a plug rod 420 arranged on the sealing body 410, a seventh sealing ring 430 is sleeved on the plug rod 420, an eighth sealing ring 440 is arranged on the top of the plug rod 420, and a sealing groove adapted to the sealing seat 400 is arranged on the main valve body 100.

[0095] In the embodiment of the present application, the plug rod 420 is arranged on the sealing body 410, and its design enables the sealing seat 400 to achieve a tight plug-in fit with the main valve body 100, and needs to be fixed by bolts after installation. The seventh sealing ring 430 is sleeved on the plug rod 420, located on the contact surface between the sealing body 410 and the main valve body 100, to prevent the medium from leaking from the gap between the plug rod 420 and the main valve body 100. The eighth sealing ring 440 is arranged on the top of the plug rod 420, and forms contact with the main valve body 100, further enhancing the sealing effect.

[0096] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0097] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A cryogenic ball valve, comprising a valve body, a valve cover (130), a ball (140), a valve seat, a valve stem (160), and an operating mechanism (170) for controlling the valve stem (160), characterized in that: The valve body comprises a main valve body (100), and an inlet valve body (110) and an outlet valve body (120) arranged on both sides of the main valve body (100), wherein the inlet valve body (110) is provided with an inlet, and the outlet valve body (120) is provided with an outlet, wherein a sealing structure is also included, and the sealing structure comprises: A first sealing structure (200) is arranged between the main valve body (100) and the inlet valve body (110); A second sealing structure (300) is disposed between the main valve body (100) and the outlet valve body (120); A sealing seat (400) is also provided at the bottom of the valve body.

2. The cryogenic ball valve according to claim 1, characterized in that: The first sealing structure (200) comprises: A first sealing ring (210) is arranged in the inlet valve body (110), and a first sealing ring groove (211) adapted to the first sealing ring (210) is arranged in the inlet valve body (110); A first mounting seat (220) comprises a first seat body (221), a first protrusion (222) arranged on one side of the first seat body (221), and a first slot (223) arranged on the other side of the first seat body (221); a plurality of first mounting slots (224) are arranged on the first seat body (221); A first spring (230) is disposed in the first mounting groove (224); A first fixing ring (240) is provided with a second protrusion (241) adapted to the first slot (223) on one side thereof, and a second sealing ring (242) is sleeved on the second protrusion (241); Wherein, a first installation step (250) adapted to the first protrusion (222) is provided on the inlet valve body (110).

3. The ultra-low temperature ball valve according to claim 2, characterized in that: The first sealing structure (200) further comprises: A first annular groove (260) is provided on a side of the main valve body (100) close to the inlet valve body (110); A third sealing ring (270) is disposed in the first annular groove (260); A first limiting step (280) is provided on the inlet valve body (110); After the inlet valve body (110) and the main valve body (100) are matched, the first limiting step (280) contacts the third sealing ring (270).

4. The ultra-low temperature ball valve according to claim 3, characterized in that: The second sealing structure (300) comprises: A fourth sealing ring (310) is arranged in the outlet valve body (120), and a second sealing ring groove (311) adapted to the fourth sealing ring (310) is arranged in the outlet valve body (120); The second mounting seat (320) comprises a second seat body (321), a third protrusion (322) arranged on one side of the second seat body (321), and a second slot (323) arranged on the other side of the second seat body (321); the second seat body (321) is provided with a plurality of second mounting slots (324); A second spring (330) is disposed in the second mounting groove (324); A second fixing ring (340) is provided with a fourth protrusion (341) adapted to the second slot (323) on one side thereof, and a fifth sealing ring (342) is sleeved on the fourth protrusion (341); Wherein, a second installation step (350) adapted to the third protrusion (322) is provided on the outlet valve body (120).

5. The ultra-low temperature ball valve according to claim 4, characterized in that: The second sealing structure (300) further comprises: A second annular groove (360) is provided on a side of the main valve body (100) close to the outlet valve body (120); A sixth sealing ring (370) is disposed in the second annular groove (360); A second limiting step (380) is provided on the outlet valve body (120); After the outlet valve body (120) is matched with the main valve body (100), the second limiting step (380) contacts the sixth sealing ring (370).

6. The ultra-low temperature ball valve according to claim 5, characterized in that: The sealing seat (400) comprises a sealing body (410) and an insert rod (420) arranged on the sealing body (410), a seventh sealing ring (430) is sleeved on the insert rod (420), an eighth sealing ring (440) is arranged on the top of the insert rod (420), and a sealing groove adapted to the sealing seat (400) is arranged on the main valve body (100).

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