Locking valve

Abstract

The utility model discloses a locking valve, and belongs to the technical field of valves. The locking valve comprises a valve cover, a valve rod and a rotating cover, the rotating cover rotatably covers the upper end of the valve cover, a linkage cavity is formed in the rotating cover, and the free end of the valve rod penetrates through the valve cover and extends into the linkage cavity; the locking valve further comprises a magnetic linkage piece, a connecting piece and an elastic piece which are installed in the linkage cavity. The magnetic linkage piece comprises a base plate rotating synchronously with the rotating cover and a transmission column fixed to the base plate. The connecting piece and the magnetic linkage piece are oppositely arranged, the free end of the valve rod can be sleeved with the connecting piece in a synchronous rotating mode, and an inserting hole matched with the transmission column is formed in the connecting piece; one end of the elastic piece abuts against the substrate, and the other end of the elastic piece abuts against the connecting piece. In a locking state, the transmission column is separated from the insertion hole; and in an unlocking state, the transmission column is inserted into the insertion hole. The locking valve is high in assembly efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a locking valve. Background Art

[0002] The locking valve mainly comprises a valve body, a valve stem, a valve cover, a rotating cover and a key. The valve stem is rotatably arranged in the valve body, the valve cover is arranged at the open end of the valve body, the rotating cover is rotatably covered on the valve cover, and a magnet, a return spring and a positioning pin are respectively arranged between the rotating cover and the valve cover; wherein, the magnet is slidably arranged in the slide groove of the rotating cover and is located above the positioning pin, and the return spring is sleeved on the outside of the positioning pin; when the key is installed on the rotating cover, due to the magnetic repulsion between the magnet in the key and the magnet in the rotating cover, the magnet can drive the magnet to press the positioning pin downward, and make the positioning pin extend into the pin hole linked to the valve stem, thereby unlocking the locking valve; when the locking valve is locked, the key is removed from the rotating cover, and at this time the return spring outside the positioning pin can drive the positioning pin to slide upward and reset, so that the bottom of the positioning pin is separated from the pin hole, so as to release the limit between the rotating cover and the valve stem, thereby realizing the locking of the locking valve.

[0003] However, since the magnet and the return spring need to be installed on different parts separately, the assembly of the entire locking valve is more troublesome, resulting in low assembly efficiency of the locking valve.

[0004] In view of the above problems, a locking valve is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a locking valve, which can make the assembly of the magnetic linkage part and the elastic part simpler and more convenient, thereby improving the assembly efficiency of the locking valve.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The locking valve comprises a valve cover, a valve stem and a rotating cover, wherein the rotating cover is rotatably covered on the upper end of the valve cover, a linkage cavity is formed inside the rotating cover, and the free end of the valve stem is passed through the valve cover and extends into the linkage cavity; the locking valve further comprises: a magnetic linkage member, a connecting member and an elastic member, wherein the magnetic linkage member, the connecting member and the elastic member are respectively installed in the linkage cavity;

[0008] The magnetic linkage member comprises a base plate that rotates synchronously with the rotating cover and a transmission column fixed on the base plate;

[0009] The connecting member is arranged opposite to the magnetic linkage member, and the connecting member is synchronously rotatably sleeved on the free end of the valve stem, and the connecting member is provided with a plug hole adapted to the transmission column;

[0010] One end of the elastic member abuts against the substrate, and the other end abuts against the connecting member;

[0011] In the locked state, the magnetic linkage part, under the elastic force of the elastic part, causes the transmission column to be separated from the plug hole;

[0012] In the unlocked state, the magnetic linkage overcomes the elastic force of the elastic member under the action of the external magnetic force, moves along the axial direction of the valve stem, and enables the transmission column to be inserted into the insertion hole.

[0013] As an optional solution, there are multiple transmission columns, each of which is spaced apart from each other, and the connecting member is provided with multiple plug-in holes, and the transmission columns can be plugged into the corresponding plug-in holes respectively.

[0014] As an optional solution, the elastic member is a spring, and the spring is sleeved on the transmission column.

[0015] As an option, the base plate is ring-shaped.

[0016] As an optional solution, a first magnetic steel is embedded in the substrate.

[0017] As an optional solution, the connecting member is axially limited to the top surface of the valve cover.

[0018] As an optional solution, the locking valve further includes a clamping member for axially limiting the connecting member, and the clamping member is fixed to the free end of the valve stem.

[0019] As an optional solution, one of the connecting member and the valve cover is provided with an annular groove, and the other is provided with a protrusion, and the protrusion can be slidably inserted into the annular groove.

[0020] As an optional solution, the locking valve further includes an unlocking member capable of driving the rotating cover to rotate synchronously, and a second magnet for providing external magnetic force is disposed inside the unlocking member.

[0021] As an optional solution, the locking valve further includes a sealing member, and the sealing member is provided between the rotating cover and the valve cover.

[0022] The beneficial effects of the utility model are:

[0023] The rotating cover is rotatably mounted on the upper end of the valve cover, so that the free end of the valve stem is inserted into the valve cover and extends into the linkage cavity of the rotating cover; and the magnetic linkage part, the connecting part and the elastic part are respectively installed in the linkage cavity; the magnetic linkage part includes a base plate that rotates synchronously with the rotating cover and a transmission column fixed on the base plate; the connecting part is arranged opposite to the magnetic linkage part, and the connecting part is synchronously rotatably sleeved on the free end of the valve stem, and the connecting part is provided with a plug hole adapted to the transmission column; one end of the elastic part abuts against the base plate, and the other end of the elastic part abuts against the connecting part; when the locking valve is in a locked state, the magnetic linkage part Under the elastic force of the elastic part, the transmission column is disengaged from the plug-in hole, so that the rotation of the rotating cover cannot drive the valve stem to rotate synchronously, so that the locking valve has an anti-theft function; when the locking valve is in an unlocked state, the magnetic linkage overcomes the elastic force of the elastic part under the action of the external magnetic force, moves along the axial direction of the valve stem, and makes the transmission column plugged into the plug-in hole. At this time, the rotation of the rotating cover can synchronously drive the valve stem to rotate; the magnetic linkage of the utility model is an integral component, and the elastic part can be assembled with it very conveniently. During actual installation, it can greatly improve the assembly efficiency of the locking valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the locking valve (in the locked state) provided by the utility model Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the locking valve (unlocked state) provided by the utility model Figure 2 .

[0026] Description of reference numerals:

[0027] 1-valve body; 2-valve stem; 3-rotating cover;

[0028] 4-magnetic linkage; 41-base plate; 42-transmission column; 43-first magnetic steel;

[0029] 5-connecting piece; 51-plug hole; 52-protrusion; 6-elastic piece; 7-valve cover; 8-sealing piece;

[0030] 9-unlocking piece; 91-inner square hole; 92-second magnetic steel;

[0031] 10-Card connector. DETAILED DESCRIPTION

[0032] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0033] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0034] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] In this embodiment, a locking valve is proposed, which has high assembly efficiency and can ensure good anti-theft performance of the locking valve, so that the working reliability of the locking valve is high. Among them, the locking valve specifically refers to a gate of an opening and closing member, and the movement direction of the gate is perpendicular to the direction of the fluid. The locking valve can only be fully opened and fully closed, and cannot be adjusted or throttled. Here, the specific type of the locking valve in this embodiment is not specifically limited.

[0036] Specifically, Figure 1 and Figure 2 As shown, the locking valve includes a valve body 1, a valve cover 7, a valve stem 2 and a rotating cover 3. The valve stem 2 is rotatably provided in the valve body 1, the open end cover of the valve body 1 is provided with a valve cover 7, the rotating cover 3 is rotatably covered on the upper end of the valve cover 7, a linkage cavity is formed inside the rotating cover 3, the free end of the valve stem 2 is penetrated through the valve cover 7 and extends into the linkage cavity; and the locking valve also includes a magnetic linkage member 4, a connecting member 5 and an elastic member 6, and the magnetic linkage member 4, the connecting member 5 and the elastic member 6 are respectively installed in the linkage cavity; the magnetic linkage member 4 includes a base plate 41 that rotates synchronously with the rotating cover 3 and a transmission member fixed on the base plate 41 The connecting piece 5 is arranged opposite to the magnetic linkage piece 4, and the connecting piece 5 can be synchronously rotatably sleeved on the free end of the valve stem 2, and the connecting piece 5 is provided with a plug hole 51 adapted to the transmission column 42; one end of the elastic piece 6 abuts against the base plate 41, and the other end of the elastic piece 6 abuts against the connecting piece 5; in the locked state, the magnetic linkage piece 4, under the elastic force of the elastic piece 6, makes the transmission column 42 disengage from the plug hole 51; in the unlocked state, the magnetic linkage piece 4 overcomes the elastic force of the elastic piece 6 under the action of the external magnetic force, moves along the axial direction of the valve stem 2, and makes the transmission column 42 plugged into the plug hole 51. The axial direction of the valve stem 2 is specifically as follows: Figure 1 The direction indicated by the arrow Z.

[0037] The rotating cover 3 is rotatably mounted on the upper end of the valve cover 7, so that the free end of the valve stem 2 is inserted into the valve cover 7 and extends into the linkage cavity of the rotating cover 3; and the magnetic linkage member 4, the connecting member 5 and the elastic member 6 are respectively installed in the linkage cavity; the magnetic linkage member 4 includes a base plate 41 that rotates synchronously with the rotating cover 3 and a transmission column 42 fixed on the base plate 41; the connecting member 5 is arranged opposite to the magnetic linkage member 4, and the connecting member 5 is synchronously rotatably sleeved on the free end of the valve stem 2, and the connecting member 5 is provided with a plug hole 51 that is compatible with the transmission column 42; one end of the elastic member 6 abuts against the base plate 41, and the other end of the elastic member 6 abuts against the base plate 41. Connecting piece 5; when the locking valve is in a locked state, the magnetic linkage piece 4, under the elastic force of the elastic piece 6, causes the transmission column 42 to disengage from the plug-in hole 51, so that the rotation of the rotating cover 3 cannot drive the valve stem 2 to rotate synchronously, so that the locking valve has an anti-theft function; when the locking valve is in an unlocked state, the magnetic linkage piece 4 overcomes the elastic force of the elastic piece 6 under the action of the external magnetic force, moves along the axial direction of the valve stem 2, and causes the transmission column 42 to be plugged into the plug-in hole 51. At this time, the rotation of the rotating cover 3 can synchronously drive the valve stem 2 to rotate; thereby, the locking valve can be switched between the locked state and the unlocked state.

[0038] Compared with the prior art, the locking valve in this embodiment changes the installation method of the magnetic linkage member 4 and the elastic member 6; by treating the magnetic linkage member 4 as an integral component, the elastic member 6 can be easily assembled with the magnetic linkage member 4, which can greatly improve the assembly efficiency of the locking valve during actual installation. In this embodiment, the elastic member 6 can be specifically a compression spring, and at least two elastic members 6 are provided.

[0039] Specifically, there are multiple transmission columns 42, and the number of the elastic member 6 and the plug holes 51 is the same as the number of the transmission columns 42, that is, multiple plug holes 51 are provided on the connecting member 5; each transmission column 42 is spaced apart from each other, and the transmission columns 42 can be plugged into the corresponding plug holes 51, so as to ensure the connection reliability between the magnetic linkage member 4 and the connecting member 5, and avoid the magnetic linkage member 4 and the connecting member 5 from being separated from each other. In this embodiment, Figure 1 As shown, the number of the transmission column 42 and the number of the plug hole 51 are respectively provided with two. Here, the number of the transmission column 42 and the plug hole 51 is not specifically limited. In this embodiment, the base plate 41 and the transmission column 42 are an integrated structure, so as to further improve the assembly efficiency of the locking valve.

[0040] Furthermore, the base plate 41 includes a top surface and a bottom surface that are relatively arranged, the top surface can be against the inner wall surface of the linkage cavity, and the transmission column 42 is fixed on the bottom surface; and the elastic member 6 is a spring, the spring is sleeved on the transmission column 42, and one end of the spring is against the bottom surface.

[0041] By setting relative top and bottom surfaces, the substrate 41 can be directly installed in the linkage cavity, and the elastic member 6 can be directly abutted against the substrate 41 without the need for other additional installation operations, which can facilitate the installation of the magnetic linkage member 4 in the linkage cavity and the installation of the elastic member 6 on the magnetic linkage member 4, making the assembly of the magnetic linkage member 4 and the elastic member 6 simpler and more convenient, thereby further improving the assembly efficiency of the entire locking valve.

[0042] Specifically, the substrate 41 is annular, and correspondingly, the linkage cavity includes at least one inner wall surface arranged in a straight line. On the one hand, the annular substrate 41 can be limited in the rotating cover 3 by the inner wall surface arranged in a straight line, and the substrate 41 can move up and down along the Z axis in the linkage cavity, so that the magnetic linkage member 4 can move on the Z axis; on the other hand, the synchronous rotation between the rotating cover 3 and the magnetic linkage member 4 can be ensured by the action of the inner wall surface arranged in a straight line. Among them, the shape of the linkage cavity matches the shape of the substrate 41.

[0043] Specifically, Figure 1 As shown, the connecting member 5 is axially limited to the top surface of the valve cover 7, and the other end of the spring abuts against the top surface of the connecting member 5, so that the installation between the connecting member 5 and the elastic member 6 is relatively simple and convenient.

[0044] Furthermore, if Figure 1 and Figure 2 As shown, an annular groove is provided on one of the connecting member 5 and the valve cover 7, and a protrusion 52 is provided on the other. The protrusion 52 is inserted into the annular groove and can rotate around the Z axis in the annular groove.

[0045] By providing the annular groove and the protrusion 52 that cooperate with each other, on the one hand, the connecting member 5 can be limited on the valve cover 7 to prevent the connecting member 5 from moving downward along the Z axis in the valve cover 7; on the other hand, it is ensured that the connecting member 5 can rotate around the Z axis relative to the valve cover 7, that is, the valve cover 7 and the valve body 1 will not rotate during the entire working process. In this embodiment, an annular groove is provided on the top surface of the valve cover 7, and a protrusion 52 is provided on the connecting member 5. In other embodiments, a protrusion 52 can also be provided on the top surface of the valve cover 7, and an annular groove can be provided on the connecting member 5.

[0046] Furthermore, if Figure 1 and Figure 2 As shown, the locking valve further includes a clamping member 10 for axially limiting the connecting member 5, and the clamping member 10 is fixed to the free end of the valve stem 2, that is, the valve stem 2 passes through the valve cover 7 and the connecting member 5 in sequence along the Z axis, and the top end surface of the valve stem 2 is spaced below the base plate 41 to avoid interference between the base plate 41 and the valve stem 2. In this embodiment, the clamping member 10 can be a retaining spring.

[0047] By setting the clamping member 10, the connecting member 5 can be limited by the clamping member 10 to prevent the connecting member 5 from moving upward along the Z axis in the valve cover 7. That is, the connecting member 5 is limited on the Z axis by the clamping member 10 and the annular groove to ensure that the connecting member 5 does not move on the Z axis.

[0048] Furthermore, if Figure 1 and Figure 2 As shown, a first magnetic steel 43 is embedded in the substrate 41, so that the first magnetic steel 43 and the substrate 41 can be assembled to form an integral structure, thereby making the assembly of the first magnetic steel 43 simpler and more convenient. The first magnetic steel 43 can be arranged in the substrate 41 by bonding.

[0049] Specifically, Figure 1 and Figure 2 As shown, the locking valve also includes an unlocking member 9 that can drive the rotating cover 3 to rotate synchronously, that is, the unlocking member 9 is detachably arranged on the rotating cover 3, and a second magnetic steel 92 for providing external magnetic force is arranged in the unlocking member 9; when the unlocking member 9 is arranged on the rotating cover 3, the magnetic linkage member 4 can overcome the elastic force of the elastic member 6 under the magnetic force of the first magnetic steel 43 and the second magnetic steel 92, and move downward along the Z axis, so that the transmission column 42 is plugged into the plug hole 51, and the rotating cover 3 is linked with the valve stem 2, so that the rotating cover 3 can drive the valve stem 2 to rotate synchronously, and the entire locking valve is in an unlocked state. Among them, the second magnetic steel 92 can be arranged in the unlocking member 9 by bonding.

[0050] Specifically, if Figure 2 As shown, when the locking valve needs to be unlocked, the unlocking member 9 is installed on the rotating cover 3. At this time, the unlocking member 9 can drive the rotating cover 3 to rotate synchronously, and the rotating cover 3 can synchronously drive the magnetic linkage member 4 to rotate, so that the magnetic linkage member 4 can drive the valve stem 2 to rotate, thereby realizing the unlocking of the locking valve.

[0051] Furthermore, the second magnet 92 is matched with the first magnet 43, and the first magnet 43 is provided with an even number and arranged in a square. The magnetic output direction of any half of the first magnet 43 is different from the magnetic output direction of the remaining half of the first magnet 43, so that each second magnet 92 in the unlocking member 9 also needs to be arranged correspondingly with each first magnet 43, so as to ensure that a magnetic repulsive force is generated between the first magnet 43 and the second magnet 92, thereby pushing the magnetic linkage member 4 to move downward in the Z axis to be linked with the valve stem 2.

[0052] By arranging the first magnet 43 in the above-mentioned magnetic output direction, it is possible to avoid the generation of magnetic repulsion between the first magnet 43 and the second magnet 43 when directly using a conventional magnet to replace the second magnet 92. That is, the arrangement of the second magnet 92 needs to be completely matched with the arrangement of the first magnet 43 to generate a magnetic repulsion between the first magnet 43 and the second magnet 92, thereby increasing the difficulty of unlocking the locking valve, thereby improving the anti-theft performance of the locking valve.

[0053] In this embodiment, four first magnetic steels 43 are provided, and the four magnetic steels are arranged in a square shape in the magnetic linkage member 4, and the N poles of two diagonally arranged first magnetic steels 43 face upward, and the S poles of the other two diagonally arranged first magnetic steels 43 face upward. The number of the first magnetic steels 43 and the second magnetic steels 92, as well as the magnetic output direction, are not specifically limited here.

[0054] Specifically, Figure 1 As shown, an inner square hole 91 is provided on the inner side of the unlocking member 9, and the rotating cover 3 is inserted and limited in the inner square hole 91. The unlocking member 9 can drive the rotating cover 3 to rotate synchronously around the Z axis.

[0055] Specifically, if Figure 1 As shown, when the locking valve is in the locked state, the unlocking member 9 is not connected to the rotating cover 3, and the elastic member 6 pushes the base plate 41 upward along the Z axis to abut against the inner top surface of the rotating cover 3. At the same time, the transmission column 42 is disengaged from the plug hole 51 of the connecting member 5, so that the magnetic linkage member 4 is not connected to the connecting member 5. At this time, when the rotating cover 3 rotates, the magnetic linkage member 4 is driven to rotate idly, and the valve stem 2 cannot be driven to rotate, that is, the rotating cover 3 can rotate without obstruction; when it is necessary to unlock the locking valve, as shown in FIG. Figure 2 As shown, the unlocking member 9 is connected to the rotating cover 3. At this time, the second magnetic steel 92 in the unlocking member 9 repels the first magnetic steel 43 in the substrate 41, so that the transmission column 42 of the magnetic linkage member 4 moves downward along the Z axis to the plug-in hole 51 of the inserted connecting member 5. Since the magnetic linkage member 4 is connected to the connecting member 5 at this time, and the connecting member 5 is connected to the valve stem 2, the rotating unlocking member 9 can drive the rotating cover 3 to rotate synchronously, and the rotating cover 3 can drive the magnetic linkage member 4 to rotate, so as to drive the connecting member 5 to rotate, thereby driving the valve stem 2 to rotate synchronously, so that the unlocking member 9 and the valve stem 2 can realize synchronous rotation to complete the opening or closing of the locking valve.

[0056] Furthermore, if Figure 1 and Figure 2 As shown, the locking valve also includes a sealing member 8, and a sealing member 8 is provided between the rotating cover 3 and the valve cover 7 to provide a sealing effect for the connection between the rotating cover 3 and the valve cover 7, thereby preventing dust and other impurities from entering the connection between the rotating cover 3 and the valve cover 7 and causing the rotating cover 3 to be stuck in rotation, thereby ensuring the smooth rotation of the rotating cover 3.

[0057] Specifically, an inner groove is provided on the outer side of the valve cover 7, and the seal 8 is limitedly installed in the inner groove, and then the rotating cover 3 is rotated to the outer side of the valve cover 7 and abuts against the seal 8. In this embodiment, the seal 8 can be a sealing ring.

[0058] The working process of the locking valve in this embodiment is as follows:

[0059] When the locking valve is in the locked state, since the unlocking member 9 is not connected to the rotating cover 3, the elastic member 6 pushes the base plate 41 upward along the Z axis to abut against the top wall surface of the linkage cavity of the rotating cover 3, and at the same time drives the transmission column 42 to disengage from the plug hole 51 of the connecting member 5, so that the magnetic linkage member 4 is not connected to the connecting member 5. At this time, when the rotating cover 3 rotates, the magnetic linkage member 4 is driven to rotate idly, and the valve stem 2 cannot be driven to rotate, that is, the rotating cover 3 can rotate without obstruction. Figure 1 shown.

[0060] When it is necessary to unlock the locked valve, the unlocking member 9 is connected to the rotating cover 3. At this time, the second magnetic steel 92 in the unlocking member 9 repels the first magnetic steel 43 in the substrate 41, so that the transmission column 42 of the magnetic linkage member 4 moves downward along the Z axis to the insertion hole 51 of the insertion connector 5. Since the magnetic linkage member 4 is connected to the connector 5 at this time, and the connector 5 is connected to the valve stem 2, the rotating unlocking member 9 can drive the rotating cover 3 to rotate synchronously, and the rotating cover 3 can drive the magnetic linkage member 4 to rotate, so as to drive the connector 5 to rotate, thereby driving the valve stem 2 to rotate synchronously, so that the locking valve can be opened or closed by the synchronous rotation between the unlocking member 9 and the valve stem 2. Figure 2 shown.

[0061] The locking valve in this embodiment uses the magnetic linkage part 4 as an integral component, so that the elastic part 6 can be assembled with the magnetic linkage part 4 very conveniently, and the assembly efficiency of the locking valve can be greatly improved during actual installation; at the same time, the base plate 41 of the magnetic linkage part 4 is limited in the linkage cavity of the rotating cover 3, so that the synchronous rotation of the rotating cover 3 and the magnetic linkage part 4 is realized; and the rotating cover 3 is limited in the inner square hole 91 of the unlocking part 9, so that the unlocking part 9 and the rotating cover 3 are synchronously rotated.

[0062] Moreover, when the locking valve in the present embodiment is locked, the rotating cover 3 can rotate freely, and there is no need to violently rotate the rotating cover 3 to avoid damaging the magnetic linkage part 4 or the connecting part 5, thereby ensuring the locking and anti-theft function of the locking valve; moreover, multiple first magnetic steels 43 with different magnetic output directions are used, and it is necessary to ensure that the second magnetic steel 92 is matched with the first magnetic steel 43 before the locking valve can be unlocked, thereby improving the anti-theft performance of the locking valve; at the same time, a sealing member 8 is provided between the valve cover 7 and the rotating cover 3, which can ensure the smoothness of the rotation of the rotating cover 3 and improve the service life of the locking valve.

[0063] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A locking valve, comprising a valve cover (7), a valve stem (2) and a rotating cover (3), wherein the rotating cover (3) is rotatably mounted on the upper end of the valve cover (7), a linkage cavity is formed inside the rotating cover (3), and a free end of the valve stem (2) is inserted through the valve cover (7) and extends into the linkage cavity; characterized in that: The locking valve further comprises: a magnetic linkage member (4), a connecting member (5) and an elastic member (6), wherein the magnetic linkage member (4), the connecting member (5) and the elastic member (6) are respectively installed in the linkage cavity; The magnetic linkage member (4) comprises a base plate (41) that rotates synchronously with the rotating cover (3) and a transmission column (42) fixed on the base plate (41); The connecting member (5) is arranged opposite to the magnetic linkage member (4), and the connecting member (5) is synchronously rotatably sleeved on the free end of the valve stem (2), and the connecting member (5) is provided with a plug hole (51) adapted to the transmission column (42); One end of the elastic member (6) abuts against the base plate (41), and the other end abuts against the connecting member (5); In the locked state, the magnetic linkage member (4) is acted upon by the elastic force of the elastic member (6) so that the transmission column (42) is disengaged from the insertion hole (51); In the unlocked state, the magnetic linkage member (4) overcomes the elastic force of the elastic member (6) under the action of the external magnetic force, moves along the axial direction of the valve stem (2), and enables the transmission column (42) to be inserted into the insertion hole (51).

2. The lock valve according to claim 1, characterized in that: There are a plurality of transmission columns (42), each of which is spaced apart from another. The connecting member (5) is provided with a plurality of insertion holes (51), and the transmission columns (42) can be respectively inserted into corresponding insertion holes (51).

3. The lock valve according to claim 1, characterized in that: The elastic member (6) is a spring, and the spring is sleeved on the transmission column (42).

4. The lock valve according to claim 1, characterized in that: The base plate (41) is ring-shaped.

5. The lock valve according to any one of claims 1 to 4, characterized in that: The substrate (41) is embedded with a first magnetic steel (43).

6. The lock valve according to any one of claims 1 to 4, characterized in that: The connecting piece (5) is axially limited to the top surface of the valve cover (7).

7. The lock valve according to claim 6, characterized in that: The locking valve further comprises a clamping member (10) for limiting the axial position of the connecting member (5), and the clamping member (10) is fixed to the free end of the valve stem (2).

8. The lock valve according to claim 6, characterized in that: One of the connecting piece (5) and the valve cover (7) is provided with an annular groove, and the other is provided with a protrusion (52), and the protrusion (52) can be slidably inserted into the annular groove.

9. The lock valve according to any one of claims 1 to 4, characterized in that: The locking valve further comprises an unlocking member (9) capable of driving the rotating cover (3) to rotate synchronously, and a second magnetic steel (92) for providing external magnetic force is arranged inside the unlocking member (9).

10. The lock valve according to any one of claims 1 to 4, characterized in that: The locking valve further comprises a sealing member (8), and the sealing member (8) is arranged between the rotating cover (3) and the valve cover (7).

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