A locking structure and an isolation valve with the same

Abstract

The application relates to a locking structure and an isolation valve with the same, which comprises a lock shell, a lifting round rod, a locking piece, a fixing sleeve and a first limiting column. The lock shell is provided with a lifting through hole matched with the lifting round rod, the lifting round rod is rotated to open the isolation valve, the lifting round rod outwardly extends to form a locking part, a cylindrical locking groove matched with the locking piece is arranged on the lock shell, the locking piece is rotationally connected with the lock shell, the locking piece abuts against the edge surface of the locking part, a gap is formed on the locking piece, the gap is located on the area swept by the locking piece rotating around the axis of the locking piece and is used for passing the edge of the locking part, the fixing sleeve is fixed relative to the valve body, a concave is formed on the side surface of the fixing sleeve in the circumferential direction, a first limiting groove matched with the first limiting column is arranged on the lock shell, and the first limiting column is arranged through the concave. The application enables the user to easily find a suitable angle by shaking the lock shell, so that the locking piece can be rotated to lock the isolation valve.

Description

Technical Field

[0001] This application relates to the field of valves, and more particularly to a locking structure and an isolation valve having the locking structure. Background Technology

[0002] Currently, to prevent accidental opening of valves or malicious opening that could lead to the theft of the internal medium, isolation valves typically employ a locking structure to enhance their security and anti-theft capabilities. The locking structure in related technologies is described below: the valve is opened by rotating the valve stem nut. The valve stem passes through a lock housing, and the area where the valve stem contacts the lock housing is prismatic. A groove is provided on the lock housing, and a locking element is inserted into and rotatably connected to the groove. A notch is formed on the side of the locking element. When the locking element abuts against the prismatic valve stem, the valve stem cannot rotate around its own axis to open the isolation valve, thus locking the isolation valve. When the notch on the locking element aligns with the prismatic valve stem, the valve stem can rotate around its own axis to open the isolation valve, thus opening the isolation valve.

[0003] However, the above solution has the following problems: when the locking element is not inserted into the locking groove, if the prism-shaped valve stem rotates so that the prism passes through the locking groove and is located on the movement path of the locking element to insert into the locking groove, the locking element will be blocked and will not be able to insert into the locking groove to achieve the above effect. The relevant technology solves the above problem by manually rotating the lock shell and repeatedly trying to insert the locking element in order to find the angle at which the locking element can be inserted. Such operation requires the user to continuously rotate the lock shell and try to insert the locking element, which wastes a lot of time. At the same time, repeated insertion of the locking element also increases the number of times the locking element rubs against the locking groove, shortening the service life of the locking structure.

[0004] In view of the above situation, this application proposes a locking structure and an isolation valve with the locking structure to solve the problem of inconvenience in using the locking structure. Summary of the Invention

[0005] To address the inconvenience of using locking structures, this application provides a locking structure and an isolation valve incorporating the locking structure.

[0006] Firstly, this application provides a locking structure that adopts the following technical solution: This application provides a locking structure that adopts the following technical solution: A locking structure includes a lock housing, a lifting rod, a locking element, a fixing sleeve, and a first limiting post. The lock housing has a lifting through hole that matches the lifting rod. The lifting rod passes through the lifting through hole and is rotatably connected to the lock housing. The lifting rod rotates within the lifting through hole around its own axis to open an isolation valve. The side of the lifting rod that contacts the lock housing protrudes radially outward to form a locking portion. The cross-section of the locking portion perpendicular to the axis of the lifting rod is a regular polygon, and the smallest circumscribed circle diameter matches the diameter of the lifting through hole. The lock housing has a locking groove. The locking element is cylindrical and matches the locking groove. The locking element passes through the locking groove and is rotatably connected to the lock housing. The lifting through hole communicates with the locking groove. The locking member abuts against the edge of the locking part. A notch is formed on the locking member, which is located in the area swept by the locking member rotating around its own axis and allows the edge of the locking part to pass through. The fixing sleeve is arranged around the lifting rod and is fixed relative to the valve body. A recess is formed on the side of the fixing sleeve along the circumferential direction. The central angle corresponding to the recess is greater than or equal to the central angle corresponding to one edge of the locking part and less than the sum of the central angles corresponding to two adjacent edges of the locking part. A first limiting groove is formed on the lock housing along the direction perpendicular to the axis of the lifting rod. The first limiting groove matches the first limiting post. The first limiting post is inserted into the first limiting groove and is slidably connected to the lock housing. The first limiting groove is connected to the lifting through hole. The first limiting post passes through the recess.

[0007] By adopting the above technical solution, when it is necessary to lock the isolation valve, the user can rotate the locking member so that the locking member abuts against the locking part edge of the lifting rod, thereby causing the notch on the locking member to rotate away from the locking part. The locking member blocks the edge of the locking part outside the locking groove, so that the locking part cannot rotate around its own axis. Therefore, the valve stem nut cannot rotate around its own axis to open the isolation valve. In summary, the above solution can lock the isolation valve.

[0008] When it is necessary to unlock the isolation valve, the user rotates the locking member so that the notch of the locking member connects with the lifting through hole. The edge of the locking part can pass through the notch, allowing the locking part to rotate around its own axis. Therefore, the user can open the isolation valve by rotating the valve stem nut.

[0009] It is worth noting that after the isolation valve is opened, the axis of the locking part may rotate into the locking groove during operation. If the isolation valve is opened before the locking part is inserted into the locking groove, the axis of the locking part may remain in the locking groove and be on the moving path of the locking part as it enters the locking groove, because the valve stem nut rotates around its own axis. This will prevent the user from inserting the locking part into the locking groove to complete the above operation when the isolation valve needs to be locked.

[0010] At this point, using the above technical solution, the user can find the position for inserting the locking element by rotating the lock housing. Due to the cooperation between the first limiting post and the recess, the first limiting post will abut against the bottom surface of the recess. When the lock housing drives the first limiting post to rotate to the edge of the recess, it will be blocked, limiting the rotation angle of the lock housing to a range greater than or equal to the central angle corresponding to one facet of the locking part, and less than the sum of the central angles corresponding to two adjacent facets of the locking part. Therefore, the user only needs to shake the lock housing within a small range to find the angle for the locking element to pass through, thereby locking the isolation valve. Similarly, when unlocking and rotating the lifting rod and needing to lock again, if the facet of the locking part is located on the rotation path of the locking element around its own axis, the above solution can also be used to easily find a suitable angle by shaking the lock housing, so that the locking element can rotate to lock the isolation valve.

[0011] Optionally, a mounting position is formed in the lifting through hole, the locking part is disposed in the mounting position, the locking groove is opened along a direction parallel to the edge of the mounting position and perpendicular to the axis of the lifting rod, the locking member is inserted into the locking groove and rotatably connected to the lock housing, and the side of the locking member abuts against the edge of the mounting position and forms the notch.

[0012] By adopting the above technical solution, the mounting position provided in the lifting through hole is used to install the locking part. Therefore, the cross section of the mounting position perpendicular to the axis of the lifting rod is a regular polygon and the minimum circumscribed circle diameter matches the diameter of the lifting through hole. The mounting position is formed with a ridge surface for abutting against the locking member. The locking groove is opened perpendicular to the lifting through hole and the side wall of the locking groove is parallel to the ridge surface of the mounting position for abutting against the locking member. Thus, the side of the locking member will abut against the ridge surface of the mounting position. If the notch is rotated and the ridge surface of the mounting position for abutting against the locking member is aligned, the locking part installed in the mounting position will be able to rotate around its own axis.

[0013] Optionally, the locking component includes a key and a lock cylinder. The lock cylinder is cylindrical and rotatably connected to the lock housing. The notch is formed on the side of the lock cylinder. The lock cylinder has a keyhole that matches the key along its own axis toward the inside of the lock housing. The key is used to pass through the keyhole and drive the lock cylinder to rotate around its axis.

[0014] By adopting the above technical solution, the locking component consists of a key and a lock cylinder. When it is necessary to unlock the isolation valve, the user can insert the key into the keyhole inside the lock cylinder to open it. At this time, the lock cylinder can rotate around its own axis, so that the notch is aligned with the edge of the locking component. The edge of the locking component can pass through the notch. At this time, the user can rotate the lifting rod to open the isolation valve. When it is necessary to lock the isolation valve, the user can use the key to rotate the lock cylinder to the above installation position, so that the side of the lock cylinder abuts against the edge of the locking part, preventing the locking part from rotating around its own axis. After that, the key is removed, so that the lock cylinder cannot be rotated. Only after inserting the key again can the lock cylinder be rotated again, which strengthens the locking effect of the isolation valve and improves security.

[0015] Optionally, it also includes an anti-loosening ball and an anti-loosening bolt. A fixing groove is formed on the lock housing along a direction perpendicular to the axis of the lock cylinder. The anti-loosening bolt is inserted into the fixing groove. An annular anti-loosening groove matching the anti-loosening ball is formed on the side of the lock cylinder in its circumference. The anti-loosening groove is connected to the fixing groove. The anti-loosening ball passes through the fixing groove and is partially inserted into the anti-loosening groove. The anti-loosening bolt is inserted into the fixing groove and is used to fix the part of the anti-loosening ball protruding from the fixing groove into the anti-loosening groove.

[0016] By adopting the above technical solution, the anti-loosening bolt fixes the anti-loosening ball in the fixing groove. When the locking member rotates, the anti-loosening ball will roll in the fixing groove. When the locking member tends to come out of the locking groove, the anti-loosening ball will prevent the locking member from coming out of the locking groove in a direction perpendicular to the tangent of the anti-loosening groove.

[0017] Optionally, the locking slot, the key, and the lock cylinder are provided in two sets, with two keys matching two lock cylinders one by one, and the two lock cylinders respectively abutting against two opposite edges of the mounting position.

[0018] By adopting the above technical solution, the locking structure is equipped with two locks, which can meet the requirement that the isolation valve can only be unlocked when both keys open the lock cylinder, thus further improving security. Furthermore, regarding the two sets of keys and lock cylinders, in different situations, they can be a combination of the same two keys and two lock cylinders, or a combination of different keys and lock cylinders.

[0019] Optionally, the first limiting post includes a pin and an elastic cylindrical pin. The pin is connected to the elastic cylindrical pin. The end of the pin away from the elastic cylindrical pin abuts against the bottom of the first limiting groove, and the end of the elastic cylindrical pin away from the pin is located at the opening of the first limiting groove.

[0020] By adopting the above technical solution, the pin, used to connect the lock housing and the fixing sleeve, has the advantages of reliable operation and convenient disassembly. The elastic cylindrical pin prevents the pin from falling out of the lock housing, possesses excellent connection performance, and has good elasticity and shear resistance.

[0021] Secondly, the isolation valve provided in this application adopts the following technical solution: An isolation valve includes the locking structure described above, and further includes a valve body and an isolation valve disc. The valve body has an inlet and an outlet, which are connected and form a medium channel within the valve body. The isolation valve disc is located within the medium channel and is used to isolate the medium channel.

[0022] By adopting the above technical solution, when the isolation valve is opened, the medium enters through the inlet and reaches the outlet through the medium channel, and then enters the subsequent device through the outlet. When the isolation valve is closed, the isolation valve disc blocks the medium in the medium channel, so that the medium cannot reach the outlet. The isolation valve disc here should be made of a material with excellent sealing performance so that the isolation valve disc and the valve body can form a sealed barrier.

[0023] Optionally, the lifting rod includes a valve stem nut and a connecting rod. The valve stem nut is arranged around the connecting rod and rotatably connected to the connecting rod. The inner wall of the valve stem nut has an internal thread, and the outer surface of the connecting rod has an external thread that matches the internal thread. The valve stem nut and the fixing sleeve are axially fixed relative to each other. The nut cap of the valve stem nut is rotatably connected to the fixing sleeve.

[0024] By adopting the above technical solution, the valve stem nut and the connecting rod are connected by threads, and the nut cap of the valve stem nut is rotatably connected to the fixed sleeve fixed on the valve body. Therefore, the position of the valve stem nut and the valve body is relatively fixed in the axial direction of the valve stem nut, and the user can open and close the isolation valve by rotating the valve stem nut.

[0025] Optionally, the fixing sleeve has a nut cavity inside, and the nut cap of the valve stem nut is disposed in the nut cavity. A thrust needle roller and retainer assembly is disposed at one end of the nut cavity away from the locking structure. The thrust needle roller and retainer assembly is rotatably connected to the end face of the nut cap of the valve stem nut.

[0026] By adopting the above technical solution, the thrust needle roller and cage assembly, as the bearing that mainly bears axial force, can withstand unidirectional axial loads, has high bearing capacity, and has the advantages of small axial cross-sectional height, saving installation space and being easy to install. Therefore, installing the thrust needle roller and cage assembly in the area where the nut cap and the retaining sleeve of the valve stem nut can extend the service life of the valve stem nut, while reducing friction and the torque required to open or close the isolation valve.

[0027] Optionally, a second limiting part is formed on the fixing sleeve. The second limiting part is arranged around the connecting rod and matches the connecting rod. The connecting rod and the second limiting part are slidably connected in the axial direction of the connecting rod. The second limiting part has a prism-shaped second limiting cavity around the connecting rod. A second limiting member is fixedly connected to the connecting rod in the circumferential direction. The second limiting member is disposed in the second limiting cavity.

[0028] By adopting the above technical solution, during the process of the connecting rod moving up and down along its axis, the second limiting member will move up and down along its axis inside the second limiting cavity. Since the connecting rod matches the second limiting part, the second limiting member will not be able to get out of the second limiting cavity. Furthermore, since the second limiting member is relatively fixed to the connecting rod, the second limiting member will be confined within the second limiting cavity by the second limiting part, thereby limiting the movement range of the connecting rod to the length range of the second limiting cavity, so that the connecting rod will not move too far and cause a waste of time and energy.

[0029] Optionally, the second limiting member includes a first limiting clamp and a second limiting clamp, wherein the first limiting clamp and the second limiting clamp engage with each other to clamp the connecting rod and are fixed relative to the connecting rod.

[0030] By adopting the above technical solution, the second limiting member is formed by the interlocking of the first limiting clamp and the second limiting clamp. Therefore, the user can easily disassemble the second limiting member, which solves the problem of not being able to put the second limiting member into the connecting rod from one end.

[0031] Optionally, the second limiting member has a plurality of abutting sides, and at least one of the abutting sides is attached to the inner wall of the second limiting portion for forming the second limiting cavity.

[0032] By adopting the above technical solution, since the second limiting cavity is prismatic, when the abutting side of the second limiting member abuts against the inner wall of the second limiting part forming the second limiting cavity, the connecting rod will not be able to rotate around its own axis, thereby limiting the rotation of the connecting rod and making it more convenient to open and close the isolation valve by rotating the valve stem nut.

[0033] Optionally, it also includes a valve stem, which is coaxially integrated with the connecting rod, and the isolation valve disc is connected to the end of the valve stem away from the connecting rod.

[0034] Optionally, it also includes a valve stem, which is coaxially arranged with and detachably connected to the connecting rod, and the isolation valve disc is connected to the end of the valve stem away from the connecting rod.

[0035] By adopting the above technical solution, the lifting rod needs to rotate around its own axis to drive the valve stem to move up and down along the axis. If the valve stem rotates coaxially with the lifting rod and is connected to the isolation valve disc, the service life of the valve stem will be greatly reduced. Therefore, in the solution proposed in this application, the connection between the valve stem and the lifting rod is hinged, which can avoid the rotation of the valve stem and thus extend the service life of the isolation valve.

[0036] Optionally, it also includes a sealing assembly, which is fixedly connected to the fixed sleeve. The fixed sleeve is matched with the valve stem and is slidably connected to the valve stem along the axial direction of the valve stem. The fixed sleeve forms a packing cavity around the valve stem, and the packing cavity is filled with sealing packing. The sealing assembly presses the sealing packing into the packing cavity.

[0037] By adopting the above technical solution, since there is a rotating connection in the above locking structure, when the valve stem is lifted, part of the medium will flow into the above structures through the gap between the isolation valve disc and the valve body. Therefore, in the solution proposed in this application, the fixed sleeve is provided with a packing cavity for accommodating the sealing packing, and a sealing assembly is used to press the packing into the packing cavity, so that the channel from the isolation valve disc to the above locking structure is always in a sealed state, ensuring that the medium is not released to the outside of the isolation valve through the above locking structure.

[0038] In summary, this application includes at least one of the following beneficial technical effects: 1. Users can find the angle for the locking element to enter by shaking the lock case within a small range, thereby locking the isolation valve. Similarly, when unlocking and rotating the lifting rod and needing to lock again, if the edge of the locking part is located on the rotation path of the locking element around its own axis, the appropriate angle can also be easily found by shaking the lock case through the above method, so that the locking element can rotate to lock the isolation valve.

[0039] 2. The thrust needle roller and cage assembly, as the primary bearing bearing for bearing axial force, can withstand unidirectional axial loads, has high bearing capacity, and features a small axial cross-sectional height, saving installation space and facilitating installation. Therefore, installing the thrust needle roller and cage assembly in the area where the valve stem nut contacts the retaining sleeve can extend the service life of the valve stem nut, while reducing friction and the torque required to open or close the isolation valve.

[0040] 3. The second limiting member will be confined within the second limiting cavity by the second limiting part, thereby limiting the movement range of the connecting rod to the length range of the second limiting cavity, so that the connecting rod does not move too far and waste time and energy.

[0041] 4. The second limiting component is formed by the interlocking of the first limiting plate and the second limiting plate. Therefore, the user can easily disassemble the second limiting component, which solves the problem of not being able to put the second limiting component into the connecting rod from one end.

[0042] 5. When the abutting side of the second limiting member abuts against the inner wall of the second limiting part forming the second limiting cavity, the connecting rod will be unable to rotate around its own axis, thereby limiting the rotation of the connecting rod and making it more convenient to open and close the isolation valve by rotating the valve stem nut. Attached Figure Description

[0043] Figure 1 This is an overall cross-sectional view of an isolation valve in an embodiment of this application.

[0044] Figure 2 This is an embodiment of the present application. Figure 1 An enlarged view of section A, showing the parts behind the hidden section.

[0045] Figure 3 This is an embodiment of the present application. Figure 1 Cross-sectional view of the locking structure in the EE direction.

[0046] Figure 4 This is an embodiment of the present application. Figure 3 An explosion diagram.

[0047] Figure 5 This is an embodiment of the present application. Figure 1 A cross-sectional view of the locking structure in the FF direction.

[0048] Figure 6 This is an embodiment of the present application. Figure 1 Enlarged view of point B in the middle.

[0049] Explanation of reference numerals in the attached figures: 1. Valve body; 11. Inlet; 12. Outlet; 13. Medium channel; 2. Isolation valve disc; 3. Valve stem; 4. Lifting rod; 41. Locking part; 42. Valve stem nut; 421. Nut cap; 43. Connecting rod; 5. Fixing sleeve; 51. Nut cavity; 511. Thrust roller and retainer assembly; 52. Second limiting part; 521. Second limiting cavity; 53. Recess; 54. Packing cavity; 55. Bracket; 6. Second limiting element; 61. First limiting clamp; 62. Second limiting clamp; 7. Locking structure; 71. Lock housing; 711. Lifting through hole; 712. Locking groove; 713. First limiting groove; 714. Anti-detachment groove; 715. Fixing 72. Fixed groove; 721. Locking element; 722. Notch; 723. Lock cylinder; 724. Key; 725. Anti-detachment ball; 73. Anti-detachment bolt; 74. First limiting post; 75. Pin shaft; 76. Resilient cylindrical pin; 8. Sealing assembly; 9. Air source connection part; 91. Air source through hole; 911. First annular step; 92. Air source plug; 921. Flange plug; 9211. Flange; 9212. Mounting rod; 9213. Sealing ring; 9214. Second annular step; 9215. Air source channel; 922. Spring seat; 9221. Base connecting hole; 923. Air source connecting valve disc; 924. Sealing spring; 93. Screw plug; 94. Sealing groove. Detailed Implementation

[0050] The present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the application.

[0051] In the following description, numerous specific details are set forth for illustrative purposes in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described. References to “an embodiment” or “an embodiment” in this disclosure mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment, and multiple references to “an embodiment” or “an embodiment” should not be construed as necessarily referring to the same embodiment.

[0052] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category whose specific examples can be used for illustration. Therefore, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.” The term “or” means any of the options and any combination of the options, including all options unless explicitly indicated that the options are mutually exclusive. The phrase “at least one of” when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all items listed unless explicitly defined as such.

[0053] This application discloses a locking structure and an isolation valve incorporating the locking structure. (Refer to...) Figure 1 and Figure 2 An isolation valve includes a valve body 1, an isolation valve disc 2, a valve stem 3, a lifting rod 4, and a locking structure 7. The valve body 1 has an inlet 11 and an outlet 12, which are connected and form a medium channel 13 within the valve body 1. The isolation valve disc 2 is located within the medium channel 13 and is used to isolate the medium channel 13.

[0054] Specifically, when the isolation valve is opened, the medium enters through the inlet and reaches the outlet 12 through the medium channel 13, thus entering the subsequent device through the outlet 12. When the isolation valve is closed, the isolation valve disc 2 blocks the medium within the medium channel 13, preventing the medium from reaching the outlet 12. The isolation valve disc 2 should be made of a material with excellent sealing performance, so that the isolation valve disc 2 and the valve body 1 can form a sealed barrier. In different embodiments, the isolation valve disc 2 and the valve body 1 can contact each other in different ways. As long as the isolation valve disc 2 can tightly abut against the inner wall of the valve body 1 located in the medium channel 13, so that the isolation valve disc 2 and the valve body 1 form a closed barrier, it is acceptable. As an example, the isolation valve disc 2 and the valve body 1 can be connected with a transition fit, and a sealing material can be provided on the surface of the isolation valve disc 2 to improve the stability of the sealing structure.

[0055] Furthermore, in different embodiments, the isolation valve disc 2 and the valve stem 3 can be connected in different ways. As long as the valve stem 3 can drive the isolation valve disc 2 to move up and down along the axis of the valve stem 3, it is acceptable. This application specifically, but not in a limited way, provides a solution in which a valve stem groove is opened at the end of the isolation valve disc 2 away from the medium channel 13, and the valve stem groove is transitionally fitted with the contact part of the valve stem 3 and the isolation valve disc 2. During installation, the user can connect the isolation valve disc 2 and the valve stem 3 by rotating and inserting the valve stem 3 into the isolation valve disc 2.

[0056] Correspondingly, in different embodiments, the valve stem 3 and the lifting rod 4 can be connected in different ways, as long as the lifting rod 4 can drive the valve stem 3 to move up and down along the axial direction. As an example, the valve stem 3 and the lifting rod 4 can be connected as a single unit. Considering that the above method is used to connect the isolation valve disc 2 and the valve stem 3, since the lifting rod 4 needs to rotate around its own axis to move up and down along the axial direction, this application specifically but not limitedly provides another connection method: the valve stem 3 and the lifting rod 4 are coaxially arranged and detachably connected to the lifting rod 4, which can better avoid the rotation of the valve stem 3, thereby extending the service life of the isolation valve.

[0057] Continue to refer to Figure 1 and Figure 2 The lifting rod 4 includes a valve stem nut 42 and a connecting rod 43. The valve stem nut 42 is arranged around and rotatably connected to the connecting rod 43. The inner wall of the valve stem nut 42 has an internal thread, and the outer surface of the connecting rod 43 has an external thread that matches the internal thread. The fixing sleeve 5 is fixed relative to the valve body 1. The valve stem nut 42 and the fixing sleeve 5 are axially fixed relative to each other. The nut cap 421 of the valve stem nut 42 is rotatably connected to the fixing sleeve 5. The valve stem nut 42 and the connecting rod 43 are connected by threads, and the nut cap 421 of the valve stem nut 42 is rotatably connected to the fixing sleeve 5 fixed on the valve body 1. Therefore, the position of the valve stem nut 42 and the valve body 1 is axially fixed relative to each other. The user can open and close the isolation valve by rotating the valve stem nut 42.

[0058] Regarding the above-mentioned solutions, in different embodiments, the valve stem nut 42 and the fixing sleeve 5 can be connected in different ways. This application specifically, but not in a limited way, provides a solution in which a nut cavity 51 is provided inside the fixing sleeve 5, and the nut cap 421 of the valve stem nut 42 is disposed in the nut cavity 51. A thrust needle roller and cage assembly 511 is provided at the end of the nut cavity 51 away from the locking structure 7. The thrust needle roller and cage assembly 511 is rotatably connected to the end face of the nut cap 421 of the valve stem nut 42. The thrust needle roller and cage assembly 511, as a bearing that mainly bears axial force, can withstand unidirectional axial load, has high bearing capacity, and has the advantages of small axial cross-sectional height, saving installation space and being easy to install. Therefore, installing the thrust needle roller and cage assembly 511 in the area where the nut cap 421 of the valve stem nut 42 contacts the fixing sleeve 5 can extend the service life of the valve stem nut 42, while reducing friction and reducing the torque required to open or close the isolation valve.

[0059] Continue to refer to Figure 1 and Figure 2In order to limit the range of movement of the lifting rod 4 and prevent the lifting rod 4 from moving too far and wasting time and energy, this application specifically, but not limitedly, provides a solution in which a second limiting part 52 is formed on the fixed sleeve 5. The second limiting part 52 is arranged around the connecting rod 43 and matches the connecting rod 43. The second limiting part 52 and the connecting rod 43 are slidably connected in the axial direction of the connecting rod 43. The second limiting part 52 has a prism-shaped second limiting cavity 521 around the connecting rod 43. A second limiting member 6 is fixedly connected to the connecting rod 43 in the circumferential direction. The second limiting member 6 is disposed in the second limiting cavity 521. During the up-and-down movement of the connecting rod 43 along its axis, the second limiting member 6 will move up and down along its axis inside the second limiting cavity 521. Since the second limiting part 52 matches the connecting rod 43, the second limiting member 6 will not be able to disengage from the second limiting cavity 521. Furthermore, since the second limiting member 6 is relatively fixed to the connecting rod 43, the second limiting member 6 will be confined within the second limiting cavity 521 by the second limiting part 52, thereby limiting the movement range of the connecting rod 43 to the length range of the second limiting cavity 521, so that the connecting rod 43 will not move too far and waste time and energy.

[0060] Regarding the above-mentioned solutions, in different embodiments, the second limiting member 6 can be composed of different parts, as long as it can be relatively fixed with the lifting rod 4 to play a limiting role. This application specifically, but not exclusively, provides a solution in which the second limiting member 6 includes a first limiting clamp 61 and a second limiting clamp 62. The first limiting clamp 61 and the second limiting clamp 62 are interlocked to clamp the connecting rod 43 and are relatively fixed to the connecting rod 43. The second limiting member 6 is formed by the interlocking of the first limiting clamp 61 and the second limiting clamp 62. Therefore, the user can easily disassemble the second limiting member 6, solving the problem that the second limiting member 6 cannot be fitted into the connecting rod 43 from one end.

[0061] Continue to refer to Figure 1 and Figure 2 To restrict the rotation of the connecting rod 43 and facilitate the opening and closing of the isolation valve by rotating the valve stem nut 42, this application specifically, but not exclusively, proposes a solution where, for the case where the second limiting cavity 521 is prismatic, the second limiting member 6 has multiple abutting sides, and at least one abutting side is attached to the inner wall of the second limiting part 52 used to form the second limiting cavity 521. Since the second limiting cavity 521 is prismatic, when the abutting side of the second limiting member 6 abuts against the inner wall of the second limiting part 52 used to form the second limiting cavity 521, the connecting rod 43 cannot rotate around its own axis, thus restricting the rotation of the connecting rod 43 and facilitating the opening and closing of the isolation valve by rotating the valve stem nut 42.

[0062] Reference Figure 1 and Figure 3The locking structure 7 is connected to the end of the lifting rod 4 away from the valve stem 3. The locking structure 7 prevents the lifting rod 4 from rotating around its own axis, thereby locking the isolation valve. Specifically, the locking structure 7 includes a lock housing 71, the lifting rod 4, a locking element 72, a fixing sleeve 5, and a first limiting post 73. The lock housing 71 has a lifting through hole 711 that matches the lifting rod 4. The lifting rod 4 passes through the lifting through hole 711 and is rotatably connected to the lock housing 71. The lifting rod 4 rotates around its own axis within the lifting through hole 711 to open the isolation valve. The side of the lifting rod 4 that contacts the lock housing 71 protrudes radially outward to form a locking part 41. The locking part 41 has a regular polygonal cross-section perpendicular to the axis of the lifting rod 4. The smallest circumscribed circle diameter of the regular polygon matches the diameter of the lifting through hole 711. A locking groove 712 is provided on the lock housing 71. The locking member 72 is cylindrical. The locking groove 712 matches the locking member 72. The locking member 72 passes through the locking groove 712 and is rotatably connected to the lock housing 71. The lifting through hole 711 communicates with the locking groove 712. The locking member 72 abuts against the edge of the locking part 41. A notch 721 is formed on the locking member 72. The notch 721 is located in the area swept by the locking member 72 rotating around its own axis and allows the edge of the locking part 41 to pass through. (Refer to...) Figure 4 and Figure 5 The fixing sleeve 5 is arranged around the lifting rod 4 and fixed relative to the valve body 1. A circumferential recess 53 is formed on the side of the fixing sleeve 5. Figure 5 The cross-sectional view shown is for reference only. Figure 5 If the center of the connecting rod 43 is taken as the center, the central angle corresponding to the recess 53 is greater than or equal to the central angle corresponding to any one facet of the locking part 41, and less than the sum of the central angles corresponding to any two adjacent facets of the locking part 41. A first limiting groove 713 is provided on the lock housing 71 along the direction perpendicular to the axis of the lifting rod 4. The first limiting groove 713 matches the first limiting post 73. The first limiting post 73 is inserted into the first limiting groove 713 and is slidably connected to the lock housing 71. The first limiting groove 713 is connected to the lifting through hole 711. The first limiting post 73 is set through the recess 53.

[0063] When it is necessary to lock the isolation valve, the user can rotate the locking member 72 so that the locking member 72 abuts against the edge of the locking part 41 of the lifting rod 4, thereby causing the notch 721 on the locking member 72 to rotate away from the locking part 41. The locking member 72 blocks the edge of the locking part 41 outside the locking groove 712, so that the locking part 41 cannot rotate around its own axis. Therefore, the valve stem nut 42 cannot rotate around its own axis to open the isolation valve. In summary, the above solution can lock the isolation valve.

[0064] When it is necessary to unlock the isolation valve, the user rotates the locking member 72 so that the notch 721 of the locking member 72 is connected to the lifting through hole 711. The edge of the locking part 41 can pass through the notch 721, so that the locking part 41 can rotate around its own axis. Therefore, the user can open the isolation valve by rotating the valve stem nut 42.

[0065] It is worth noting that after the isolation valve is opened, the axis of the locking part 41 may rotate to the locking groove 712 during operation. If the isolation valve is opened before the locking member 72 is inserted into the locking groove 712, the axis of the locking part 41 may remain in the locking groove 712 and be on the moving path of the locking member 72 as it enters the locking groove 712, because the valve stem nut 42 rotates around its own axis. This will prevent the user from inserting the locking member 72 into the locking groove 712 to complete the above operation when the isolation valve needs to be locked.

[0066] At this point, through the above solution, the user can find the position for the locking member 72 to be inserted by rotating the lock housing 71. Due to the cooperation between the first limiting post 73 and the recess 53, the first limiting post 73 will abut against the bottom surface of the recess 53. When the lock housing 71 drives the first limiting post 73 to rotate to the edge of the recess 53, it will be blocked, limiting the rotation angle of the lock housing 71 to a range greater than or equal to the central angle corresponding to one facet of the locking part 41, and less than the sum of the central angles corresponding to two adjacent facets of the locking part 41. Therefore, the user only needs to shake the lock housing 71 within a small range to find the angle for the locking member 72 to be inserted, thereby locking the isolation valve. Similarly, when unlocking and rotating the lifting rod 4 and needing to lock again, if the facet of the locking part 41 is located on the rotation path of the locking member 72 around its own axis, the user can also easily find a suitable angle by shaking the lock housing 71 through the above solution, so that the locking member 72 can rotate to lock the isolation valve.

[0067] In different embodiments, the locking groove 712 can be opened in different directions, as long as the locking groove 712 can communicate with the lifting through hole 711 and the locking member 72 can abut against the edge surface of the locking part 41. This application specifically, but not limitedly, provides the following solution: a mounting position is formed in the lifting through hole 711, and the shape of the mounting position is adapted to the shape of the locking part 41. It should be noted that the mounting position in the lifting through hole 711 refers to a part of the space in the lifting through hole 711, which is a relatively fixed part of the space with reference to the lock housing 71. When the locking part 41 is in the initial position, the locking part 41 is set in the mounting position. It should be noted that when the locking part 41 rotates with the connecting rod 43, the locking part 41 will intermittently deviate from the mounting position. The locking groove 712 is opened along the direction parallel to the edge of the mounting position and perpendicular to the axis of the lifting rod 4. The locking member 72 is inserted into the locking groove 712 and is rotatably connected to the lock housing 71. The side of the locking member 72 abuts against the edge of the mounting position and forms a notch 721.

[0068] Another proposed solution is as follows: the locking groove 712 is opened in a direction perpendicular to the edge of the locking part 41, the locking member 72 is inserted into the locking groove 712 and is rotatably connected to the lock housing 71, the end face of the locking member 72 at the bottom of the locking groove 712 abuts against the edge of the locking part 41, and a notch 721 is formed in the area swept by the end face of the locking member 72 at the bottom of the locking groove 712 around its own axis.

[0069] Regarding the first solution mentioned above, in different embodiments, the locking member 72 can be composed of different parts. As long as it can be inserted into the locking groove 712 and rotatably connected to the locking groove 712, and has the above-mentioned notch 721 for the edge of the locking part 41 to pass through, it is acceptable. This application specifically, but not limitedly, proposes a composition structure: the locking member 72 includes a key 723 and a lock cylinder 722. The lock cylinder 722 is cylindrical and rotatably connected to the lock shell 71. The side of the lock cylinder 722 forms a notch 721. The lock cylinder 722 has a keyhole that matches the key 723 along its own axis toward the inside of the lock shell 71. The key 723 is used to insert into the keyhole and drive the lock cylinder 722 to rotate around the axis of the lock cylinder 722. When the isolation valve needs to be locked, the user can insert key 723 into the keyhole of lock cylinder 722 to open lock cylinder 722. At this time, lock cylinder 722 can rotate around its own axis, so that the notch 721 is aligned with the edge of locking member 72, and the edge of locking member 72 can pass through the notch 721. At this time, the user can rotate lifting rod 4 to open isolation valve. When the isolation valve needs to be unlocked, the user can use key 723 to rotate lock cylinder 722 to the above-mentioned installation position, so that the side of lock cylinder 722 abuts against the edge of locking part 41, so that locking part 41 cannot rotate around its own axis. After that, key 723 is pulled out, so that lock cylinder 722 cannot be rotated. Only after key 723 is inserted again can lock cylinder 722 be rotated again, which strengthens the locking effect of isolation valve and improves security. In addition, to meet the requirement that the isolation valve can only be unlocked when both keys 723 open the lock cylinder 722, thereby further improving security, this solution is provided with two sets of locking slots 712, keys 723 and lock cylinders 722. Each set has one locking slot 712, key 723 and lock cylinder 722. The key 723 and lock cylinder 722 in each set are matched, and the two lock cylinders 722 abut against the two opposite edges of the mounting position.

[0070] To prevent the locking element 72 from disengaging from the locking groove 712, this application specifically, but not exclusively, proposes a solution in which the locking structure 7 further includes an anti-disengagement ball 724 and an anti-disengagement bolt 725. A fixing groove 715 is formed on the lock housing 71 along a direction perpendicular to the axis of the lock cylinder 722. The anti-disengagement bolt 725 is inserted into the fixing groove 715. An annular anti-disengagement groove 714 matching the anti-disengagement ball 724 is formed on the side of the lock cylinder 722 in its circumferential direction. The anti-disengagement groove 714 is connected to the fixing groove 715. 24 passes through the fixing groove 715 and partially enters the anti-detachment groove 714. The anti-detachment bolt 725 passes through the fixing groove 715 and is used to fix the part of the anti-detachment ball 724 protruding from the fixing groove 715 in the anti-detachment groove 714. When the locking member 72 rotates, the anti-detachment ball 724 will roll in the fixing groove 715. When the locking member 72 tends to detach out of the locking groove 712, the anti-detachment ball 724 will prevent the locking member 72 from detaching from the locking groove 712 in a direction perpendicular to the tangent of the anti-detachment groove 714.

[0071] The first limiting post 73 cooperates with the aforementioned recess 53 to abut against the bottom surface of the recess 53, thereby preventing the lock housing 71 from rotating. The rotation angle of the lock housing 71 is limited to a range greater than or equal to the central angle corresponding to one facet of the locking part 41, and less than the sum of the central angles corresponding to two adjacent facets of the locking part 41. In different embodiments, the first limiting post 73 can be composed of different parts. As an example, the first limiting post 73 includes a pin 731 and a resilient cylindrical pin 732. The pin 731 is connected to the resilient cylindrical pin 732. The end of the pin 731 away from the resilient cylindrical pin 732 abuts against the bottom of the first limiting groove 713, and the end of the resilient cylindrical pin 732 away from the pin 731 is located at the opening of the first limiting groove 713. The pin 731 connects the lock housing 71 and the fixing sleeve 5, offering advantages such as reliable operation and convenient disassembly. The elastic cylindrical pin 732 serves to prevent the pin 731 from falling out of the lock housing 71, and has excellent connection performance, as well as good elasticity and shear resistance.

[0072] Continue to refer to Figure 1 and Figure 3 As a supplement, since there is a rotating connection in the locking structure 7, when the valve stem 3 is lifted, part of the medium will flow into the second limiting cavity 521 and the nut cavity 51 through the gap between the isolation valve disc 2 and the valve body 1, and may even flow out of the isolation valve through the lifting through hole 711. Therefore, this application specifically but not limitedly provides a solution: the isolation valve with the locking structure also includes a sealing assembly 8, the sealing assembly 8 is fixedly connected to the fixing sleeve 5, the fixing sleeve 5 matches the valve stem 3 and is slidably connected to the valve stem 3 along the axial direction of the valve stem 3, the fixing sleeve 5 forms a packing cavity 54 around the valve stem 3, the packing cavity 54 is filled with sealing packing, and the sealing assembly 8 presses the sealing packing into the packing cavity 54.

[0073] Reference Figure 1 and Figure 6 As a supplement, to facilitate the opening of the main valve using a pilot valve, this application specifically, but not exclusively, provides a solution in which the aforementioned isolation valve further includes an air source communication portion 9. The air source communication portion 9 is formed on the valve body 1 and integrally connected to it, and the medium channel 13 extends into the air source communication portion 9. An air source through hole 91 is formed on the air source communication portion 9, connecting the medium channel 13 to the outside. An air source plug 92 is provided at the air source through hole 91 in the air source communication portion 9. The air source plug 92 matches the air source through hole 91 and is used to block the air source through hole 91. An air source channel 9215 is formed from the outer surface of the air source plug 92 inwards. An external air source pressure can be connected to the air source channel 9215, and the air source pressure is used to control the opening and closing of the air source channel 9215.

[0074] When the user needs to introduce an external air source to open the pilot valve, the user can connect the medium channel 13 to the outside by using the external air source pressure, thereby increasing the medium flow rate in the medium channel 13, and thus increasing the pressure at one end of the pilot valve disc to open the pilot valve. When the pilot valve is opened, the pressure in the medium channel 13 at one end of the main valve disc along the opening direction will decrease rapidly, and the main valve can be opened quickly.

[0075] In addition, the above structure also allows users to easily obtain the flow rate of the medium, the pressure of the medium on the valve body, and various parameters of the medium itself at any time.

[0076] In different embodiments, the air source plug 92 can be composed of different structures. Therefore, users can connect the medium channel 13 to the outside world in different ways to introduce an external air source. In this regard, this application specifically but not limitedly provides a solution. The air source plug 92 includes a flange plug 921, a spring seat 922, an air source connecting valve 923, and a sealing spring 924. The flange plug 921 includes a flange 9211 and an installation rod 9212 that passes through the medium channel 13. The flange 9211 and the installation rod 9212 are integrally formed. The flange 9211 abuts against the air source connecting part 9 and covers the air source through hole 91. The installation rod 9212 is installed in the medium channel 13.

[0077] A first annular step 911 is formed on the inner wall of the air source communication part 9, which forms the air source through hole 91, around the medium channel 13. The spring seat 922 matches and abuts against the first annular step 911. The end of the mounting rod 9212 away from the flange 9211 abuts against the spring seat 922. An air source channel 9215 is formed on the outer surface of the flange plug 921 along the axis of the mounting rod 9212 towards the spring seat 922. Several base communication holes 9221 are formed on the spring seat 922. The medium channel 13 is connected to the gas source channel 9215. The inner wall of the mounting rod 9212 near the spring seat 922 is provided with a second annular step 9214. The gas source connecting valve 923 abuts against the second annular step 9214. The two ends of the sealing spring 924 are fixedly connected to the spring seat 922 and the gas source connecting valve 923 respectively. Several valve connecting holes (not shown in the figure) are provided on the gas source connecting valve 923 at the position where it abuts against the second annular step 9214. The valve connecting holes are used to connect the two sides of the gas source connecting valve 923 in the axial direction of the mounting rod 9212.

[0078] Because the air source connecting valve disc 923 abuts against the second annular step 9214, the valve disc connecting hole on the air source connecting valve disc 923 is sealed by the second annular step 9214, thus preventing the medium from being released to the external space through the air source channel 9215. In use, the user can push the air source connecting valve disc 923 towards the inside of the medium channel 13 from the outside. At that time, the sealing spring 924 is compressed, and the air source connecting valve disc 923 will leave the second annular step 9214, allowing the valve disc connecting hole to connect the air source channel 9215 with the external space. The user can then introduce external air through the air source channel as a pressure source to increase the pressure inside the pilot valve, thereby opening the pilot valve to reduce the pressure at one end of the main valve disc along the opening direction and quickly open the main valve. After use, the user only needs to remove the external force that moved the sealing spring 924, allowing the sealing spring 924 to return to its initial state, so that the air source connecting valve disc 923 can be re-abutted against the second annular step 9214.

[0079] Reference Figure 1 and Figure 6 Regarding the shape and positional relationship between the gas source connecting valve disc 923 and the second annular step 9214, this application proposes another solution: the gas source connecting valve disc 923 is a trapezoidal frustum, with its frustum side abutting against the second annular step 9214 and maintaining a sealed state. In use, the user can push the gas source connecting valve disc 923 towards the inside of the medium channel 13 from the outside. At that time, the sealing spring 924 is compressed, and the gas source connecting valve disc 923 will move away from the second annular step 9214, thus maintaining the sealed state. The state will be broken, allowing the external air source to enter the air source channel through the circumferential side of the frustum-shaped part of the air source connecting valve, and allowing the medium in the air source channel to flow to the external space along the circumferential side of the frustum-shaped part of the air source connecting valve, thus realizing the connection between the air source channel 9215 and the external space. After use, the user only needs to remove the external force of the moving sealing spring 924 to return the spring to its initial state, so that the air source connecting valve 923 can be re-attached to the second annular step 9214 and maintain the sealing state.

[0080] Regarding the above-mentioned solution, although the air source connecting valve 923 and the second annular step 9214 can form a sealed structure, in order to ensure that the sealing state of the air source connecting part 9 is not accidentally broken when no external air source is needed, this application specifically, but not limitedly, proposes a solution: the aforementioned air source connecting part 9 further includes an air source plug 93, which is inserted through the outer surface of the flange 9211 into the air source channel 9215 and used to block the air source channel 9215. In use, the user first pulls the plug 93 out of the air source channel 9215, and then uses a long rod or other tool to push the air source connecting valve 923 to open the air source channel 9215 and connect it to the outside.

[0081] In different embodiments, the air source channel 9215 can have different shapes. For example, the air source channel 9215 can be cylindrical or similar. In addition, in different embodiments, the screw plug 93 can have different shapes. In order for the screw plug 93 to block the air source channel 9215, for example, the screw plug 93 can have the same shape as the air source channel 9215. In another embodiment, an operating position suitable for installing the screw plug 93 can be provided at the opening of the air source channel 9215 on the outer surface of the flange 9211. That is, the air source channel 9215 here is set to be cylindrical and has internal threads, and external threads matching the internal threads are provided on the screw plug 93, so that the screw plug 93 can be easily installed in the above-mentioned installation position to protect the air source channel 9215.

[0082] As a supplement, in order to enhance the sealing performance at the contact point between the air source plug 92 and the air source communication portion 9 on the valve body, this application specifically but not limitingly proposes a solution in which a sealing groove 94 is formed on the air source communication portion 9, the sealing groove 94 is formed on the surface of the air source communication portion 9 that contacts the flange 9211, and a sealing ring 9213 that matches the sealing groove 94 is formed on the flange 9211, the sealing ring 9213 is formed on the surface of the flange 9211 that contacts the air source communication portion 9.

[0083] In different embodiments, the flange 9211 can be installed on the gas source connection part 9 in different ways, as long as it can form a sealed structure and facilitate the connection of an external gas source. For example, the flange 9211 can be connected to the gas source connection part 9 by bolts.

[0084] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A locking structure, characterized in that, The device includes a lock housing (71), a lifting rod (4), a locking element (72), a fixing sleeve (5), and a first limiting post (73). The lock housing (71) has a lifting through hole (711) that matches the lifting rod (4). The lifting rod (4) passes through the lifting through hole (711) and is rotatably connected to the lock housing (71). The lifting rod (4) rotates around its own axis within the lifting through hole (711) to open the isolation valve. The side of the lifting rod (4) that contacts the lock housing (71) extends radially outward. A locking part (41) is formed by protrusion. The cross-section of the locking part (41) perpendicular to the axis of the lifting rod (4) is a regular polygon, and the diameter of its smallest circumscribed circle matches the diameter of the lifting through hole (711). A locking groove (712) is provided on the lock housing (71). The locking member (72) is cylindrical. The locking groove (712) matches the locking member (72). The locking member (72) passes through the locking groove (712) and is rotatably connected to the lock housing (71). The lifting through hole (711) is connected to the locking groove (712). The locking member (72) abuts against the edge of the locking part (41). A notch (721) is formed on the locking member (72). The notch (721) is located on the area swept by the locking member (72) rotating around its own axis and allows the edge of the locking part (41) to pass through. The fixing sleeve (5) is arranged around the lifting rod (4) and fixed relative to the valve body (1). A recess (53) is formed on the side of the fixing sleeve (5) along the circumferential direction. The central angle corresponding to the recess (53) is greater than or equal to the central angle corresponding to one edge of the locking part (41). And less than the sum of the central angles corresponding to the two adjacent facets of the locking part (41), the lock shell (71) is provided with a first limiting groove (713) along the direction perpendicular to the axis of the lifting rod (4), the first limiting groove (713) matches the first limiting post (73), the first limiting post (73) is inserted into the first limiting groove (713) and is slidably connected to the lock shell (71), the first limiting groove (713) is connected to the lifting through hole (711), and the first limiting post (73) is set through the recess (53).

2. The locking structure according to claim 1, characterized in that, An installation position is formed in the lifting through hole (711), and the locking part (41) is disposed in the installation position. The locking groove (712) is opened in a direction parallel to the edge of the installation position and perpendicular to the axis of the lifting rod (4). The locking member (72) is inserted into the locking groove (712) and is rotatably connected to the lock shell (71). The side of the locking member (72) abuts against the edge of the installation position and forms the notch (721).

3. The locking structure according to claim 2, characterized in that, The locking component (72) includes a key (723) and a lock cylinder (722). The lock cylinder (722) is cylindrical and rotatably connected to the lock housing (71). The notch (721) is formed on the side of the lock cylinder (722). The lock cylinder (722) has a keyhole that matches the key (723) along its own axis toward the inside of the lock housing (71). The key (723) is used to pass through the keyhole and drive the lock cylinder (722) to rotate around the axis of the lock cylinder (722).

4. The locking structure according to claim 3, characterized in that, It also includes an anti-loose ball (724) and an anti-loose bolt (725). The lock housing (71) has a fixing groove (715) in a direction perpendicular to the axis of the lock cylinder (722). The side of the lock cylinder (722) has an annular anti-loose groove (714) that matches the anti-loose ball (724) in its circumference. The anti-loose groove (714) is connected to the fixing groove (715). The anti-loose ball (724) passes through the fixing groove (715) and is partially inserted into the anti-loose groove (714). The anti-loose bolt (725) is inserted into the fixing groove (715) and is used to fix the part of the anti-loose ball (724) that protrudes from the fixing groove (715) into the anti-loose groove (714).

5. The locking structure according to claim 4, characterized in that, The locking groove (712), the key (723) and the lock cylinder (722) are provided in two sets. The two keys (723) are matched with the two lock cylinders (722) one by one, and the two lock cylinders (722) respectively abut against the two opposite edges of the mounting position.

6. The locking structure according to claim 1, characterized in that, The first limiting post (73) includes a pin (731) and an elastic cylindrical pin (732). The pin (731) is connected to the elastic cylindrical pin (732). The end of the pin (731) away from the elastic cylindrical pin (732) abuts against the bottom of the first limiting groove (713). The end of the elastic cylindrical pin (732) away from the pin (731) is located at the opening of the first limiting groove (713).

7. An isolation valve, characterized in that, The device includes the locking structure (7) as described in any one of claims 1-6, and further includes a valve body (1) and an isolation valve disc (2). The valve body (1) has an inlet (11) and an outlet (12) formed thereon. The inlet (11) and the outlet (12) are connected and form a medium channel (13) in the valve body (1). The isolation valve disc (2) is located in the medium channel (13) and is used to isolate the medium channel (13).

8. The isolation valve according to claim 7, characterized in that, The lifting rod (4) includes a valve stem nut (42) and a connecting rod (43). The valve stem nut (42) is arranged around the connecting rod (43) and is rotatably connected to the connecting rod (43). The inner wall of the valve stem nut (42) has an internal thread, and the outer surface of the connecting rod (43) has an external thread that matches the internal thread. The valve stem nut (42) and the fixing sleeve (5) are fixed relative to each other in the axial direction of the valve stem nut (42). The nut cap (421) of the valve stem nut (42) is rotatably connected to the fixing sleeve (5).

9. The isolation valve according to claim 8, characterized in that, The fixed sleeve (5) has a nut cavity (51) inside. The nut cap (421) of the valve stem nut (42) is located in the nut cavity (51). A thrust roller and retainer assembly (511) is provided at one end of the nut cavity (51) away from the locking structure (7). The thrust roller and retainer assembly (511) is rotatably connected to the end face of the nut cap (421) of the valve stem nut (42).

10. The isolation valve according to claim 8, characterized in that, A second limiting part (52) is formed on the fixed sleeve (5). The second limiting part (52) is arranged around the connecting rod (43) and matches the connecting rod (43). The connecting rod (43) and the second limiting part (52) are slidably connected in the axial direction of the connecting rod (43). The second limiting part (52) has a prism-shaped second limiting cavity (521) around the connecting rod (43). A second limiting member (6) is fixedly connected to the connecting rod (43) in the circumferential direction. The second limiting member (6) is disposed in the second limiting cavity (521).

11. The isolation valve according to claim 10, characterized in that, The second limiting member (6) includes a first limiting clamp (61) and a second limiting clamp (62). The first limiting clamp (61) and the second limiting clamp (62) engage with each other to clamp the connecting rod (43) and are fixed relative to the connecting rod (43).

12. The isolation valve according to claim 10, characterized in that, The second limiting member (6) has a plurality of abutting sides, and at least one of the abutting sides is attached to the inner wall of the second limiting part (52) for forming the second limiting cavity (521).

13. The isolation valve according to claim 8, characterized in that, It also includes a valve stem (3), which is coaxially integrated with the connecting rod (43), and the isolation valve disc (2) is connected to the end of the valve stem (3) away from the connecting rod (43).

14. The isolation valve according to claim 8, characterized in that, It also includes a valve stem (3), which is coaxially arranged with the connecting rod (43) and detachably connected to the connecting rod (43), and the isolation valve disc (2) is connected to the end of the valve stem (3) away from the connecting rod (43).

15. The isolation valve according to claim 13, characterized in that, It also includes a sealing assembly (8), which is fixedly connected to the fixing sleeve (5). The fixing sleeve (5) matches the valve stem (3) and is slidably connected to the valve stem (3) along the axial direction of the valve stem (3). The fixing sleeve (5) forms a packing cavity (54) around the valve stem (3). The packing cavity (54) is filled with sealing packing. The sealing assembly (8) presses the sealing packing into the packing cavity (54).

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