A self-locking valve coupling

Abstract

The present invention discloses a self-locking valve coupling, wherein the valve body adopts two groups of identical structures, and locking surfaces are respectively provided on the front end surfaces where the two groups of valve bodies are located, and the locking and fixing between the two groups of valve bodies is realized by the mutual locking of the locking surfaces; an inner cavity penetrating from front to back is formed in the middle part where the valve body is located, and a ball valve is provided in the inner cavity, so that the ball valve is rotated and connected perpendicular to the flow direction of the inner cavity, and a penetrating ball hole is formed in the middle part of the ball valve, and the blocking / penetration of the inner cavity is realized by the deflection of the ball valve; the bottom center of the ball valve is fixed in the vertical direction by the first limit pin, and the ball valve is realized to rotate along the central axis direction where the first limit pin and the second limit pin are located. The self-locking valve coupling of this device has broad application prospects through double valve body structure, efficient fluid control, superior sealing performance, convenient installation and maintenance, advanced locking system and strong adaptability.

Description

Technical Field

[0001] The invention belongs to the technical field of valve couplings, and in particular relates to a self-locking valve coupling. Background Art

[0002] Fluid valve coupling is a mechanical component used to connect and transmit torque, it plays an important role in the field of industrial automation and fluid control. It not only transmits torque, but also integrates fluid control functions, such as controlling the flow direction and pressure of the fluid.

[0003] In industrial fluid control systems, the design and connection of valves are crucial to the overall performance and safety of the system. Traditional valve connection methods mostly use threaded connections or flange connections, which have certain limitations in installation and maintenance, such as complex installation, poor sealing, and easy loosening. Therefore, it is particularly important to develop an efficient, reliable and easy-to-operate valve connection device.

[0004] Under high pressure or high flow rate conditions, the sealing ring of traditional valves is easily worn, resulting in leakage, affecting the stable transmission of fluids. Existing connection methods usually require professional tools and technicians, increasing the difficulty and cost of installation and maintenance. The opening and closing operations of some valves are cumbersome, resulting in the inability to respond quickly in emergency situations, affecting system safety. Summary of the invention

[0005] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a self-locking valve coupling to solve the above-mentioned technical problems existing in the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A self-locking valve coupling comprises a valve body and a locking body.

[0008] The valve bodies adopt two groups of identical structures, and locking surfaces are respectively provided on the front end surfaces where the two groups of valve bodies are located, and the locking and fixing between the two groups of valve bodies are achieved by mutual locking of the locking surfaces;

[0009] An inner cavity is formed in the middle of the valve body and penetrates from front to back, and a ball valve is arranged in the inner cavity, so that the ball valve is connected by rotation perpendicular to the flow direction of the inner cavity, and a ball hole is formed in the middle of the ball valve, so that the inner cavity can be blocked / passed through by the deflection of the ball valve;

[0010] The bottom center of the ball valve is fixed in the vertical direction by a first limit pin, and the top center of the ball valve is fixed in the vertical direction by a second limit pin, and the ball valve is rotated along the central axis direction where the first limit pin and the second limit pin are located;

[0011] The lock body comprises a lock platform, a rotating handle, a first lock piece, and a second lock piece, wherein the lock platform is located on the outer wall where the valve body is located; the rotating handle is connected to the second limit pin, and the rotation of the rotating handle synchronously drives the deflection movement of the ball valve;

[0012] The first locking member enables the rotation handle and the locking platform to be locked and fixed;

[0013] The second locking component is arranged along the flow direction of the valve body and synchronously passes through the connecting holes on the two groups of valve bodies, and the second locking component is locked by the first locking component.

[0014] Further, the locking surface includes a protrusion, an enlarged opening, and an arc-shaped notch, the protrusion is arranged perpendicular to the end surface where the locking surface is located, and the enlarged opening is flush with the front end surface where the locking surface is located, and an arc-shaped notch is formed in the transition area between the protrusion and the enlarged opening;

[0015] The arc-shaped notch on one of the valve bodies forms an insertion for the protrusion on the other valve body, and then the protrusion is rotated and closed to be embedded in the bottom of the enlarged opening, thereby forming a mutual lock between the two valve bodies.

[0016] An arch-shaped protrusion is formed outward at the front end portion where the protrusion is located, so that the protrusion is locked with the inner wall of the enlarged opening on the other group of upper valve bodies.

[0017] Furthermore, a guide groove is provided on the upper part of the outer wall where the ball valve is located, which is synchronized with the opening direction of the ball hole, and the lower part of the second limit pin is embedded in the guide groove, so that when the second limit pin rotates, the ball valve located in the guide groove is synchronously driven to rotate along the center axis direction.

[0018] Furthermore, an annular connecting groove is provided on the outer edge of the front end surface of the inner cavity where the valve body is located, and a sealing ring is carried in the connecting groove. The sealing ring is annular in structure as a whole, and a reinforcing inner rib is provided along the diameter of the inner side of the inner wall where the sealing ring is located;

[0019] The height of the outer end surface of the sealing ring is higher than the height of the outer end surface where the annular connecting groove is located.

[0020] Furthermore, a tower connection part is connected to the outer end portion where the valve body is located, the front end portion of the tower connection part is implanted into the inner cavity of the valve body, and the rear end portion extends outward;

[0021] The inner diameter of the middle through hole where the tower-type connecting part is located is set to be the same as the ball hole of the ball valve.

[0022] Furthermore, an annular bearing groove is provided on the outer wall of the front end portion where the tower connection portion is located, and a plurality of annular bearing grooves are arranged along the extension direction of the central axis of the tower connection portion, and a sealing fastening ring is provided in the annular bearing groove, and the sealing fastening ring is a notched annular structure.

[0023] Furthermore, an annular embedding groove is provided on the inner wall of the outer end portion where the valve body is located, so that the annular embedding groove matches the innermost annular bearing groove where the tower connection portion is located, and an annular protrusion extends outward from the outer periphery of the tower connection portion where the annular bearing groove is located, so that the annular protrusion forms a limit to the outer end portion where the valve body is located;

[0024] The outermost side surface of the annular embedding groove is a vertical surface, and the position close to the ball valve is arranged as an inclined surface structure.

[0025] Furthermore, an arc-shaped limiting protrusion is provided on the surface where the locking platform is located, and the arc-shaped limiting protrusion is 90 degrees as a whole, and a sunken embedding opening is provided at the end where the arc-shaped limiting protrusion is located, so that the sunken embedding opening is used to support the rotating handle.

[0026] Furthermore, two groups of transverse first connecting holes are opened on the side where the rotating handle is located, and the two groups of first connecting holes are distributed up and down, and a second connecting hole is opened on the front end seat where the rotating handle is located; when the ball hole where the ball valve is located is fully opened, the rotating handle is embedded in the position where the sunken embedding port is located, so that the first connecting hole and the second connecting hole on the upper layer where the rotating handle is located are concentric, and are fixed by the first locking piece; when the ball hole where the ball valve is located is closed, the first locking piece is separated from the rotating handle, and the rotating handle is lifted to synchronously rotate the ball hole until it is transferred to the sunken embedding port on the other side and embedded, so that the first connecting hole and the second connecting hole on the upper layer where the rotating handle is located are concentric, and are fixed by the first locking piece.

[0027] Furthermore, the end portion where the second locking member is located forms an annular ring, and the first locking members located on the ball valves on both sides can simultaneously lock the second locking member.

[0028] Beneficial effects of the present invention:

[0029] 1. This device is provided with an annular connecting groove on the outer edge of the locking surface of the inner cavity, with a sealing ring embedded in it. The inner side of the inner wall is provided with reinforcing ribs to improve the sealing performance and overall strength. At the same time, a sealing ring is provided in the annular connecting groove at the front end of the inner cavity, and the outer end surface of the sealing ring is higher than the groove surface to ensure a good seal when the valve body is in contact to avoid fluid leakage.

[0030] 2. The ball valve used in this device is set up so that it can rotate freely in the inner cavity, and the deflection of the ball hole can be used to completely block or penetrate the fluid. This design ensures the rapid switching of fluid flow and improves the flexibility of operation. In addition, when the ball valve is in the open state, it can remain in a floating state when impacted by the fluid, reducing the direct impact on the inner wall, thereby extending the service life; in the case of a floating ball valve, the force arm of the rotating handle connected to it can be reduced to open or close.

[0031] 3. The tower connection part of this device is designed to be easily connected with pipe fittings or pipelines, and can meet different installation requirements. The design of the annular bearing groove and the sealing fastening ring improves the fastness and sealing of the connection. The annular embedding groove matches the annular bearing groove of the tower connection part, reducing the misalignment during assembly and ensuring the sealing performance.

[0032] 4. The combination of the rotating handle, the first locking member and the second locking member on the device provides a convenient valve operation method. By rotating the handle, the on / off state of the ball valve can be easily switched while ensuring the stability of the locking. At the same time, the design of the arc-shaped limit protrusion and the sunken embedding port on the locking platform ensures that the rotating handle is accurately fixed in different positions to avoid misoperation.

[0033] 5. The self-locking valve coupling of this device provides an efficient and reliable valve connection solution through a double valve body structure, efficient fluid control, superior sealing performance, convenient installation and maintenance, advanced locking system and strong adaptability, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0035] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of a top view of the structure of an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the valve body structure of an embodiment of the present invention;

[0038] Figure 4 This is a schematic structural diagram of a valve body assembly state according to an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of the sealing ring structure of an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of the ball valve structure of an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of the structure of a tower connection part according to an embodiment of the present invention;

[0042] Figure 8 The embodiment of the present invention Figure 4 Schematic diagram of the cross-section structure;

[0043] Fig. 9 Embodiment of the present invention Figure 8 A schematic diagram of the structure of part A;

[0044] Fig.10 It is a schematic diagram of the structure of a sealing fastening ring according to an embodiment of the present invention;

[0045] Fig.11 is a schematic diagram of the structure of a rotating handle according to an embodiment of the present invention;

[0046] Fig.12 is a schematic structural diagram of a second locking member according to an embodiment of the present invention;

[0047] Fig.13 is a schematic cross-sectional structure diagram of two groups of valve bodies in a locked state according to an embodiment of the present invention;

[0048] Fig.14 The embodiment of the present invention Fig.13 Schematic diagram of part of the structure at B in the middle. DETAILED DESCRIPTION

[0049] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a self-locking valve coupling, including a valve body 1 and a lock body 4.

[0051] The valve bodies 1 adopt two groups of identical structures, and locking surfaces 2 are respectively provided on the front end surfaces of the two groups of valve bodies 1, and the locking and fixation between the two groups of valve bodies 1 is achieved by mutual locking of the locking surfaces 2.

[0052] like Figure 3As shown, an inner cavity 101 penetrating front to back is formed in the middle part of the valve body 1, and a ball valve 3 is provided in the inner cavity 101, so that the ball valve 3 is rotatably connected perpendicular to the flow direction of the inner cavity 101, and a penetrating ball hole 301 is formed in the middle part of the ball valve 3, and the blocking / penetration of the inner cavity 101 is achieved by the deflection of the ball valve 3, that is, when the ball hole 301 is in the same direction as the flow direction of the inner cavity 101, full opening and penetration are achieved, and when the ball hole 301 is perpendicular to the flow direction of the inner cavity 101, the ball valve 3 forms a blockage in the flow direction of the inner cavity 101.

[0053] An annular connecting groove 103 is provided on the outer edge of the front end surface of the inner cavity 101 where the valve body 1 is located (in order to improve the overall strength of the valve body 1, a one-time casting method can be adopted), and a sealing ring 102 is carried in the connecting groove 102. The sealing ring 102 is annular in structure as a whole, and a reinforcing inner rib 1021 is provided along the diameter of the inner side of the inner wall where the sealing ring 102 is located. This reinforcing inner rib 1021 can form a support in the thickness direction (such as Figure 5 As shown in FIG. 1 , the height of the outer end face of the sealing ring 102 is higher than the height of the outer end face of the annular connecting groove 103. When the end faces of the sealing rings 102 on the two sets of valve bodies 1 contact each other, the gaps that can form a contact are sealed by the sealing rings 102, thereby ensuring the sealing performance of the inner cavity 101 when transmitting fluid.

[0054] The bottom center of the ball valve 3 is fixed in the vertical direction by the first limit pin 302, and the top center of the ball valve 3 is fixed in the vertical direction by the second limit pin 303, and the ball valve 3 can be rotated along the central axis direction where the first limit pin 302 and the second limit pin 303 are located. In this way, the ball valve 3 can be freely switched in the inner cavity 101.

[0055] like Figure 6 As shown, a guide groove 304 is provided on the upper part of the outer wall where the ball valve 3 is located, which is synchronized with the opening direction of the ball hole 301, and the lower part of the second limit pin 303 is embedded in the guide groove 304, so that when the second limit pin 303 rotates, it synchronously drives the ball valve 3 located in the guide groove 304 to rotate along the central axis direction, that is, when the ball hole 301 of the ball valve 3 is coaxial with the inner cavity 101, the entire ball valve 3 is in an open state, and the opened ball valve 3 will be impacted by the fluid and produce an impact on the front end face of the valve body 1. At this time, the second limit pin 303 is connected to the upper part of the ball valve 3 in a non-completely fixed manner, so the impact on the ball valve 3 produces a movement margin in the impact direction, which can reduce the direct impact on the inner wall of the ball valve 3 (that is, the entire ball valve 3 is in a floating state) and extend its service life. At this time, an annular buffer ring 305 is provided at the front end of the ball valve 3 and the inner side of the inner cavity 101 (see for details). Fig.14), the buffer ring 305 can fill the gap between the front end of the ball valve 3 and the inner cavity 101, and can reduce the overflow from the connection gap of the ball valve 3 when the corrosive liquid flows, thereby affecting the service life of the ball valve 3.

[0056] When the ball valve 3 is closed as a whole, the direction of the guide groove 304 is perpendicular to the extension direction of the inner cavity 101, so that the ball valve 3 can be completely closed to form a closure on the inner cavity 101, and the vertical setting of the guide groove 304 will not cause floating or shaking, so its overall airtightness is higher.

[0057] The locking surface 2 includes a protrusion 21, an enlarged opening 22 and an arc-shaped notch 23. The protrusion 21 is arranged perpendicular to the end surface where the locking surface 2 is located, and the enlarged opening 22 is flush with the front end surface where the locking surface 2 is located. At the same time, an arc-shaped notch 23 is formed in the transition area between the protrusion 41 and the enlarged opening 42; at this time, the protrusion 21 located on one group of valve bodies 1 cooperates and embeds into the arc-shaped notch 23 on the other group of valve bodies 1, and then the two groups of valve bodies 1 rotate relative to each other, so that the front end of the protrusion 21 on one group of valve bodies 1 is embedded into the bottom of the enlarged opening 22 on the other group of valve bodies 1, that is, the two groups of valve bodies 1 are locked with each other. In order to ensure the firmness of the locking, an arched protrusion 211 is formed outward at the front end where the protrusion 21 is located, so that the protrusion 211 and the inner wall of the enlarged opening 22 on the other group of upper valve bodies 1 are locked with each other, that is, when the two groups of valve bodies 1 are locked with each other, they can also withstand a larger pressure-bearing capacity.

[0058] The outer end of the valve body 1 is connected to a tower connection part 5, the front end of the tower connection part 5 is implanted in the inner cavity 101 of the valve body 1, and the rear end extends outward and can be externally connected to pipes or pipelines, that is, it can be adjusted and installed according to actual needs.

[0059] The inner diameter of the middle through hole where the tower connection part 5 is located is set to be the same as the ball hole 301 of the ball valve 3, thereby ensuring smoothness and stability during the retransmission of the fluid.

[0060] like Figure 7 As shown, the outer wall of the front end portion where the tower connection portion 5 is located is provided with an annular bearing groove 501, and the annular bearing groove 501 is arranged in a plurality of groups along the extension direction of the central axis of the tower connection portion 5, and a sealing fastening ring 502 is provided in the annular bearing groove 501, and the sealing fastening ring 502 is a notched annular structure (such as Fig.10 As shown), the sealing fastening ring 502 with a notch is convenient for installation with the annular bearing groove 501, and when the tower connecting part 5 is connected to the rear end of the valve body 1, it fits with the inner wall of the valve body 1, thereby improving the fastening performance and the overall sealing performance.

[0061] like Figure 8 , Fig. 9As shown, an annular embedding groove 111 is opened on the inner wall of the outer end portion where the valve body 1 is located, so that the annular embedding groove 111 and the innermost annular bearing groove 501 where the tower connecting part 5 is located are matched with each other, and an annular protrusion 503 is extended outward from the outer periphery of the tower connecting part 5 where the annular bearing groove 501 is located, so that the annular protrusion 503 forms a limit for the outer end portion where the valve body 1 is located; therefore, during assembly, the annular protrusion 503 can match the connection position between the valve body 1 and the tower connecting part 5, reduce the occurrence of misalignment, thereby achieving the mutual engagement and matching between the sealing fastening ring 502 and the annular protrusion 503 and the annular bearing groove 501 at the same time.

[0062] The outermost side surface of the annular embedding groove 111 is a vertical surface, and is arranged as an inclined surface structure near the position where the ball valve 3 is located. This method facilitates the installation of the annular protrusion 503. During assembly, the sealing fastening ring 502 and the annular bearing groove 501 are directly engaged with each other, and then the tower connecting part 5 is implanted into the rear end portion where the valve body 1 is located.

[0063] like Figure 4 As shown, the lock body 4 includes a lock platform 41, a rotating handle 42 (such as Fig.11 As shown), the first locking member 43, the second locking member 44 (as shown Fig.12 As shown), the locking platform 41 is located on the outer wall where the valve body 1 is located (and forms an integral part with the outer wall of the valve body 1); the rotating handle 42 is connected to the second limit pin 303, and the deflection movement of the ball valve 3 is synchronously driven by the rotation of the rotating handle 42.

[0064] The first locking member 43 locks and fixes the rotating handle 42 and the locking platform 41;

[0065] The second locking member 44 is arranged along the flow direction of the valve body 1 and simultaneously passes through the connecting holes 401 located on the two groups of valve bodies 1 , and the second locking member 44 is locked by the first locking member 43 .

[0066] like Fig.13 As shown, an arc-shaped limiting protrusion 411 is provided on the surface where the locking platform 41 is located, and the arc-shaped limiting protrusion 411 is 90 degrees as a whole, and a sunken embedding opening 412 is provided at the end where the arc-shaped limiting protrusion 411 is located, so that the sunken embedding opening 412 is used to support the rotating handle 42. When the rotating handle 42 is embedded in the position of the sunken embedding opening 412 in the same extension direction as the inner cavity 101, the ball valve 3 is in an open state and serves to fix the rotating handle 42. When the rotating handle 42 is embedded in the position of the sunken embedding opening 412 perpendicular to the extension direction of the inner cavity 101, the ball valve 3 is in a closed state.

[0067] Two groups of first connecting holes 421 are opened transversely on the side where the rotating handle 42 is located (that is, the first connecting holes 421 pass through the width direction of the rotating handle 42), and the two groups of first connecting holes 421 are distributed up and down, and a second connecting hole 422 is opened on the front end seat 402 where the rotating handle 42 is located; when the second connecting hole 422 matches the upper first connecting hole 421 on the side where the rotating handle 42 is located, and is fixed through the first locking piece 43, the rotating handle 42 will be embedded in the sunken embedding port 412 in the same extension direction as the inner cavity 101, that is, the ball hole 301 where the ball valve 3 is located is fully opened.

[0068] When the second connecting hole 422 matches the first connecting hole 421 of the upper and lower layers at the side where the rotating handle 42 is located, the first locking piece 43 is passed through and fixed. At this time, the outer end of the rotating handle 42 will be tilted up and disconnected from the sunken embedding port 412, and then the whole is rotated until the rotating handle 42 drives the ball valve 3 to rotate 90 degrees (the ball valve 3 as a whole forms a blockage to the interior of the inner cavity 101), and then the end of the rotating handle 42 continues to be placed in the sunken embedding port 412, and the first locking piece 43 is passed through the upper first connecting hole 421 and the second connecting hole 422 at the same time again, thereby limiting the relative position of the rotating handle 42.

[0069] The ends where the second locking member 44 is located form an annular ring, and the first locking member 43 on the ball valves 3 at both sides locks the second locking member 44 synchronously. That is, when the ball valve 3 is opened, the first locking member 43 on the valve bodies 1 at both ends locks the rotating handle 42, and when the ball valve 3 is closed, the first locking member 43 on the valve bodies 1 at both ends locks the rotating handle 42 (at this time, the two groups of first locking members 43 are close to each other, and the two groups of first locking members 43 are locked simultaneously by the second locking member 44 again, ensuring the stability of the first locking member 43 after locking), and at the same time, the second locking member 44 will synchronously penetrate the connecting holes 401 on the two groups of valve bodies 1 (in the locked state, the connecting holes 401 on the two groups of valve bodies 1 will be coaxially arranged).

[0070] The design of the self-locking valve coupling is not only suitable for multiple industries such as water treatment, petrochemicals, and food processing, but can also be customized according to different fluid characteristics and working environments to meet the market's demand for efficient fluid control. With the development of industrial automation and intelligence, the application potential of this valve coupling will be further expanded.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A self-locking valve coupling, comprising a valve body (1) and a locking body (4), characterized in that: The valve bodies (1) are of two identical structures, and locking surfaces (2) are provided on the front end surfaces of the two valve bodies (1), respectively, so that the locking and fixing between the two valve bodies (1) is achieved by mutual locking of the locking surfaces (2); An inner cavity (101) is formed in the middle of the valve body (1) and penetrates from front to back, and a ball valve (3) is provided in the inner cavity (101), so that the ball valve (3) is connected by rotation perpendicular to the flow direction of the inner cavity (101), and a ball hole (301) is formed in the middle of the ball valve (3), so that the inner cavity (101) can be blocked / passed through by the deflection of the ball valve (3); The bottom center of the ball valve (3) is fixed in the vertical direction by a first limit pin (302), and the top center of the ball valve (3) is fixed in the vertical direction by a second limit pin (303), and the ball valve (3) is rotated along the central axis direction where the first limit pin (302) and the second limit pin (303) are located; The locking body (4) comprises a locking platform (41), a rotating handle (42), a first locking member (43), and a second locking member (44); the locking platform (41) is located on the outer wall where the valve body (1) is located; the rotating handle (42) is connected to the second limit pin (303), and the deflection movement of the ball valve (3) is synchronously driven by the rotation of the rotating handle (42); The first locking member (43) enables the rotating handle (42) and the locking platform (41) to be locked and fixed; The second locking member (44) is arranged along the flow direction of the valve body (1) and synchronously passes through the connecting holes (401) located on the two groups of valve bodies (1), and the second locking member (44) is locked by the first locking member (43).

2. The self-locking valve coupling according to claim 1, characterized in that: The locking surface (2) comprises a protruding portion (21), an enlarged opening (22) and an arc-shaped notch (23); the protruding portion (21) is arranged perpendicular to the end surface where the locking surface (2) is located, and the enlarged opening (22) is flush with the front end surface where the locking surface (2) is located, and an arc-shaped notch (23) is formed in the transition area between the protruding portion (21) and the enlarged opening (22); The arc-shaped notch (23) on one group of the valve bodies (1) is inserted into the protrusion (21) on the other group of valve bodies (1), and then the protrusion (21) is rotated and closed to be embedded in the bottom of the enlarged opening (22), thereby forming a mutual lock between the two groups of valve bodies (1). An arch-shaped protrusion (211) is formed at the front end portion where the protrusion (21) is located, which is extended outward, so that the protrusion (211) and the inner wall of the enlarged opening (22) on the other set of upper valve bodies (1) are locked with each other.

3. The self-locking valve coupling according to claim 1, characterized in that: A guide groove (304) is provided on the upper portion of the outer wall where the ball valve (3) is located, which is synchronized with the opening direction of the ball hole (301), and the lower portion of the second limit pin (303) is embedded in the guide groove (304), so that when the second limit pin (303) rotates, the ball valve (3) located in the guide groove (304) is synchronously driven to rotate along the central axis direction.

4. The self-locking valve coupling according to claim 1, characterized in that: An annular connecting groove (103) is provided on the outer edge of the front end surface of the inner cavity (101) where the valve body (1) is located, and a sealing ring (102) is carried in the connecting groove (102); the sealing ring (102) is annular in structure as a whole, and a reinforcing inner rib (1021) is provided along the diameter of the inner side of the inner wall where the sealing ring (102) is located; The height of the outer end surface of the sealing ring (102) is higher than the height of the outer end surface where the annular connecting groove (103) is located.

5. The self-locking valve coupling according to claim 1, characterized in that: A tower-type connection part (5) is connected to the outer end portion where the valve body (1) is located, the front end portion of the tower-type connection part (5) is implanted in the inner cavity (101) of the valve body (1), and the rear end portion extends outwards; The inner diameter of the middle through hole where the tower-type connecting part (5) is located is arranged to be the same as the ball hole (301) of the ball valve (3).

6. The self-locking valve coupling according to claim 5, characterized in that: An annular bearing groove (501) is provided on the outer wall of the front end portion where the tower-type connecting portion (5) is located. The annular bearing grooves (501) are arranged in a plurality of groups along the extension direction of the central axis of the tower-type connecting portion (5). A sealing fastening ring (502) is provided in the annular bearing groove (501). The sealing fastening ring (502) is a notched annular structure.

7. The self-locking valve coupling according to claim 5, characterized in that: An annular embedding groove (111) is provided on the inner wall of the outer end portion where the valve body (1) is located, so that the annular embedding groove (111) matches the innermost annular bearing groove (501) where the tower-type connecting portion (5) is located, and an annular protrusion (503) extends outward from the outer periphery of the tower-type connecting portion (5) where the annular bearing groove (501) is located, so that the annular protrusion (503) forms a limit to the outer end portion where the valve body (1) is located; The outermost side surface of the annular embedding groove (111) is a vertical surface, and the position close to the ball valve (3) is arranged as an inclined surface structure.

8. The self-locking valve coupling according to claim 1, characterized in that: The surface of the locking platform (41) is provided with an arc-shaped limiting protrusion (411), and the arc-shaped limiting protrusion (411) is 90 degrees as a whole, and a sunken embedding opening (412) is provided at the end where the arc-shaped limiting protrusion (411) is located, so that the sunken embedding opening (412) is used to support the rotating handle (42).

9. The self-locking valve coupling according to claim 1, characterized in that: Two groups of transverse first connection holes (421) are provided on the side where the rotating handle (42) is located, and the two groups of first connection holes (421) are distributed up and down, and a second connection hole (422) is provided on the front end seat (402) where the rotating handle (42) is located; when the ball hole (301) where the ball valve (3) is located is fully opened, the rotating handle (42) is embedded in the position where the sunken embedding opening (412) is located, so that the first connection hole (421) on the upper layer where the rotating handle (42) is located is connected to the second connection hole ( 422) and is fixed through the first locking piece (43); when the ball hole (301) where the ball valve (3) is located is closed, the first locking piece (43) is separated from the rotating handle (42), and the rotating handle (42) is lifted to rotate the ball hole (301) synchronously until it is transferred to the sunken embedding port (412) on the other side and embedded, so that the first connecting hole (421) and the second connecting hole (422) on the upper layer where the rotating handle (42) is located are concentric and fixed through the first locking piece (43).

10. The self-locking valve coupling according to claim 1, characterized in that: The end portion where the second locking member (44) is located forms an annular ring, and the first locking members (43) located on the ball valves (3) on both sides simultaneously lock the second locking member (44).

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