Variable diameter quick disconnect fitting, method of use and applications thereof

Abstract

The application discloses a variable-diameter quick conversion joint, which comprises an upper sealing cover, a containing cavity and a lower sealing cover, the containing cavity comprises a containing cavity cavity and a threaded pipe one, a threaded pipe one is fixedly connected to the middle position below the bottom of the containing cavity cavity, the threaded pipe one is communicated with the containing cavity cavity, a variable-diameter split slider mechanism and a rectangular connecting block sliding gasket are embedded in the containing cavity cavity, the rectangular connecting block sliding gasket is located below the variable-diameter split slider mechanism, a circular through hole one with the same inner diameter as the threaded pipe one is formed in the top surface of the upper sealing cover, a conversion joint inner pipe is fixedly connected to one side of the lower sealing cover, a threaded pipe two is fixedly connected to the other side of the lower sealing cover, and the lower sealing cover, the conversion joint inner pipe and the threaded pipe two are communicated; the application has the advantages of convenient operation, time and labor saving, and is suitable for various different fields and has very wide market prospect.

Description

Technical Field

[0001] This invention provides a variable diameter quick-change coupling and its usage and application, particularly relating to the field of pipe connection technology. Background Technology

[0002] A quick connector is a device that allows for easy and rapid connection or disconnection with water pipes, fittings, and other equipment of different diameters. Due to its advantages of speed, convenience, and practicality, it is widely used in fields such as fire rescue, fuel transportation, landscaping, farmland irrigation, building installation, vehicle systems, and chemical processes.

[0003] Taking its application in the fire protection field as an example, fire hose couplings are mainly used for connecting fire hoses, fire hydrants, and water guns to transport water or mixed liquids for fire extinguishing. Currently, the fire hose coupling products used domestically are mainly divided into internal snap-fit ​​couplings and clip-on couplings, both of which are available in φ65mm and φ80mm diameters. However, fixed fire protection facilities and underground fire hydrants in Chinese buildings generally use φ65mm internal snap-fit ​​couplings. Therefore, fire hoses of different types and diameters must be equipped with different adapters to achieve good connection with fixed fire protection facilities and underground fire hydrants in buildings. Furthermore, during fire extinguishing, situations often arise where fire hoses of different diameters need to be connected, which also necessitates the use of the couplings of this invention.

[0004] When a fire breaks out inside a building, firefighters first use fixed fire-fighting equipment to extinguish it. However, because fires are unpredictable, firefighters need to select fire hoses with diameters of φ65mm or φ80mm depending on the fire situation. They also need to carry various adapters of different diameters and types to connect the fire hoses to the fixed fire-fighting equipment. This process is not only cumbersome and complex, but also prone to oversights. If the appropriate adapter is not used in time, it will delay the operation and waste precious rescue time.

[0005] At the same time, current fire-fighting interfaces also have problems such as inconvenient installation and fixing, and disconnection due to unstable connection. Therefore, they will greatly affect the efficiency of fire rescue work, thus causing incalculable losses to people's lives and property.

[0006] Therefore, there is an urgent need for a fast interface that can solve the above problems. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] This invention provides a variable diameter quick conversion joint, its usage method, and its application. It can not only effectively solve the problems in the fire protection field where the fire fighting work is delayed due to the untimely switching of conversion interfaces, and the problem of connecting fire hoses of different diameters, but also effectively solve the problem of connecting pipes of different diameters and types in other fields.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] The first objective of this invention is to provide a variable diameter quick-change connector, comprising an upper sealing cap, a receiving cavity, and a lower sealing cap, wherein the receiving cavity comprises a receiving cavity body and a threaded tube.

[0012] A threaded tube is fixedly connected to the middle position below the bottom of the receiving cavity. The threaded tube communicates with the receiving cavity. A variable diameter split slider mechanism and a rectangular connecting block sliding pad are embedded inside the receiving cavity. The rectangular connecting block sliding pad is located below the variable diameter split slider mechanism.

[0013] The top surface of the upper sealing cover is provided with a circular through hole with the same inner diameter as the threaded pipe.

[0014] The lower sealing cover is fixedly connected to the inner tube of the conversion joint on one side and to the second threaded tube on the other side. The lower sealing cover, the inner tube of the conversion joint, and the second threaded tube are connected in communication.

[0015] Furthermore, the upper sealing cover is threadedly connected to the receiving cavity, and the variable diameter split slider mechanism and the rectangular connecting block sliding gasket are sealed within the receiving cavity.

[0016] Furthermore, the inner tube of the conversion connector is fitted with an axial compensation gasket, and the lower sealing cover is threadedly connected to the threaded tube, thereby fixing the axial compensation gasket inside the lower sealing cover.

[0017] The axial compensation pad is a stepped axial compensation pad, which includes a high-order rubber ring and a low-order rubber ring arranged coaxially in a stepped manner.

[0018] Moreover, the variable diameter split slider mechanism includes a hexagonal integrated outer spring and three sets of variable diameter split slider combinations;

[0019] The variable diameter split slider assembly includes an arc-shaped variable diameter split slider one and an arc-shaped variable diameter split slider two. A rectangular connecting block one is fixedly connected to the middle position of the bottom of the variable diameter split slider one, and a rectangular connecting block two is fixedly connected to the middle position of the bottom of the variable diameter split slider two. The variable diameter split slider one and the variable diameter split slider two are arranged adjacent to each other.

[0020] Moreover, the inner diameter of the rectangular connecting block sliding pad is the same as the inner diameter of the threaded pipe, and multiple rectangular grooves are evenly provided on the rectangular connecting block sliding pad.

[0021] Both rectangular connecting block one and rectangular connecting block two slide within the rectangular groove.

[0022] Furthermore, an inner spring baffle of the variable diameter split slider two is fixedly connected to the outer arc surface of the variable diameter split slider two, and a quick connector spring claw is movably provided on the inner arc surface of the variable diameter split slider two. The quick connector spring claw abuts against the inner spring baffle of the variable diameter split slider two through the inner spring of the variable diameter split slider two.

[0023] Furthermore, the outer arc surface of each of the variable diameter split sliders is fixedly connected to the inner spring baffle of each of the variable diameter split sliders by rivets to the inner side of the hexagonal integrated outer spring.

[0024] Furthermore, an anti-collision protective sleeve is fixedly provided on the outer circumferential surface of the upper sealing cover;

[0025] A sealing rubber gasket is movably fitted onto the threaded pipe.

[0026] The second objective of this invention is to provide a method for using a variable diameter quick-connect coupling in the field of fire protection interfaces, as detailed below:

[0027] The variable-diameter split slider mechanism is detachably snapped into the fire-fighting-specific card interface.

[0028] The card-type interface compresses the variable-diameter split slider one and the variable-diameter split slider two to make them slide radially.

[0029] The quick connector spring claw limits the groove on the card interface;

[0030] One end of the inner tube of the adapter is fitted into the card interface;

[0031] The threaded pipe can be used after being connected to the fixed fire hydrant.

[0032] This invention can also be applied to fuel transportation, landscaping, farmland irrigation, building installation, vehicle systems, and chemical processes.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. The present invention provides a variable diameter quick conversion connector and its usage method and application. When applied in fire rescue work, it replaces the traditional 65 / 65 and 65 / 80 conversion interfaces. After firefighters select the φ65mm or φ80mm diameter fire hose according to the fire situation, they no longer need to carry multiple conversion interfaces of different diameters and types to connect the fire hose to the fixed fire-fighting facilities. It completely solves the problem of the inappropriate use or omission of conversion interfaces affecting the rescue speed, greatly simplifies the preparation work of firefighters when responding to the alarm, is easy to operate, saves time and effort, wins valuable time for rescue, and minimizes the loss of people's lives and property.

[0035] 2. The present invention provides a variable diameter quick conversion connector and its usage method and application, which can realize the quick connection of fire hoses of different diameters, and can solve the problem of fire hoses of different diameters being unable to be connected in a timely and effective manner during fire fighting;

[0036] 3. The present invention provides a variable diameter quick conversion joint and its usage method and application. By setting a variable diameter split slider mechanism, it can easily and quickly snap on fire-specific snap-fit ​​interfaces of different diameters, which is convenient for installation and disassembly. At the same time, by setting the inner tube of the conversion joint and the axial compensation rubber gasket, the connection between the fire-specific snap-fit ​​interface and the present invention can be more stable and less likely to detach.

[0037] 4. The variable diameter quick conversion joint and its usage method and application provided by this invention can effectively solve the problem of connecting pipes of different diameters and types in other fields. It can also be used to conveniently and quickly lengthen or interrupt various pipelines. It is applicable to a variety of different fields and has a very broad market prospect. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0039] Figure 2 This is the front view of the present invention;

[0040] Figure 3 This is a top view cross-sectional structural diagram of the present invention;

[0041] Figure 4 This is an exploded view of the overall structure of the present invention;

[0042] Figure 5 This is a three-dimensional structural schematic diagram of the variable-diameter split slider mechanism in this invention;

[0043] Figure 6 This is a three-dimensional structural diagram of the card interface in an embodiment of the present invention;

[0044] Figure 7This is a three-dimensional structural diagram of the axial compensation pad in this invention;

[0045] Figure 8 This is a schematic diagram of the working state of an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the non-working state according to an embodiment of the present invention;

[0047] Figure 10 This is a three-dimensional structural schematic diagram of the variable-diameter split slider of the present invention;

[0048] Figure 11 This is a three-dimensional structural schematic diagram of the variable-diameter split slider II in this invention.

[0049] In the diagram: 1. Anti-collision protective sleeve; 2. Upper sealing cover; 21. Circular through hole one; 3. Hexagonal integrated outer spring; 4. Receiving cavity; 41. Receiving cavity body; 42. Threaded tube one; 5. Axial compensation rubber pad; 501. High-grade rubber ring; 502. Low-grade rubber ring; 6. Lower sealing cover; 7. Inner tube of conversion joint; 8. Sealing rubber gasket; 9. Variable diameter split slider one; 901. Rectangular connecting block one; 10. Variable diameter split slider two; 1001. Rectangular connecting block two; 11. Inner spring baffle of variable diameter split slider two; 12. Inner spring of variable diameter split slider two; 13. Quick connector spring claw; 14. Rivet; 15. Rectangular connecting block sliding pad; 1501. Rectangular slide groove; 16. Threaded tube two; 17. Card interface. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] Example 1

[0052] Combination Figures 1-11 This embodiment provides a variable diameter quick-change adapter, as detailed below:

[0053] A variable diameter quick-change connector includes an upper sealing cover 2, a receiving cavity 4, and a lower sealing cover 6. The receiving cavity 4 includes a receiving cavity body 41 and a threaded tube 42. The threaded tube 42 is fixedly connected to the middle position below the bottom of the receiving cavity body 41, and the threaded tube 42 communicates with the receiving cavity body 41. The receiving cavity body 41 is embedded with a variable diameter split slider mechanism and a rectangular connecting block sliding pad 15, and the rectangular connecting block sliding pad 15 is located below the variable diameter split slider mechanism. The top surface of the upper sealing cover 2 has a circular through hole 21 with the same inner diameter as the threaded tube 42. The lower sealing cover 6 has a conversion connector inner tube 7 fixedly connected to one side and a threaded tube 16 fixedly connected to the other side. The lower sealing cover 6, the conversion connector inner tube 7, and the threaded tube 16 communicate with each other.

[0054] Furthermore, the upper sealing cover 2 is threadedly connected to the receiving cavity 41, and the variable diameter split slider mechanism and the rectangular connecting block sliding gasket 15 are sealed inside the receiving cavity 41.

[0055] Furthermore, an axial compensation gasket 5 is fitted on the inner tube 7 of the adapter, and the lower sealing cover 6 is threadedly connected to the threaded tube 42, and the axial compensation gasket 5 is fixed inside the lower sealing cover 6; the axial compensation gasket 5 is a stepped axial compensation gasket, and includes a high-level rubber ring 501 and a low-level rubber ring 502 arranged coaxially in a stepped manner.

[0056] Furthermore, the variable diameter split slider mechanism includes a hexagonal integrated outer spring 3 and three sets of variable diameter split slider assemblies; the variable diameter split slider assembly includes an arc-shaped variable diameter split slider 19 and an arc-shaped variable diameter split slider 20. A rectangular connecting block 1901 is fixedly connected to the middle position of the bottom of the variable diameter split slider 19, and a rectangular connecting block 2001 is fixedly connected to the middle position of the bottom of the variable diameter split slider 20. The variable diameter split slider 19 and the variable diameter split slider 20 are arranged adjacent to each other.

[0057] Furthermore, the inner diameter of the rectangular connecting block sliding pad 15 is the same as the inner diameter of the threaded pipe 42, and a plurality of rectangular sliding grooves 1501 are evenly provided on the rectangular connecting block sliding pad 15; both the rectangular connecting block 901 and the rectangular connecting block 1001 slide within the rectangular sliding grooves 1501.

[0058] Furthermore, a variable diameter split slider 2 inner spring baffle 11 is fixedly connected to the outer arc surface of the variable diameter split slider 2 10, and a quick connector spring claw 13 is movably arranged on the inner arc surface of the variable diameter split slider 2 10. The quick connector spring claw 13 abuts against the variable diameter split slider 2 inner spring baffle 11 through the variable diameter split slider 2 inner spring 12.

[0059] Furthermore, the outer arc surface of each variable diameter split slider 9 and the inner spring baffle 11 of each variable diameter split slider 10 are fixedly connected to the inner side of the hexagonal integrated outer spring 3 by rivets 14.

[0060] Furthermore, an anti-collision protective sleeve 1 is fixedly installed on the outer circumference of the upper sealing cover 2; a sealing rubber gasket 8 is movably fitted on the threaded tube 16.

[0061] Example 2

[0062] Combination Figures 1-11 The variable diameter quick-connect coupling and its usage method provided in this embodiment, when applied in fire rescue work, are as follows:

[0063] A variable diameter quick-change connector includes an upper sealing cover 2, a receiving cavity 4, and a lower sealing cover 6. The receiving cavity 4 includes a receiving cavity body 41 and a threaded tube 42. The receiving cavity body 41 is cylindrical in shape, and the threaded tube 42 is fixedly connected to the middle position of the bottom. The threaded tube 42 is connected to the receiving cavity body 41. The inner diameter of the threaded tube 42 is φ80mm. The receiving cavity body 41 is embedded with a variable diameter split slider mechanism and a rectangular connecting block sliding pad 15. The rectangular connecting block sliding pad 15 is located below the variable diameter split slider mechanism. The top surface of the upper sealing cover 2 has a circular through hole 21 with the same inner diameter as the threaded tube 42. The lower sealing cover 6 has a conversion connector inner tube 7 fixedly connected to one side and a threaded tube 16 fixedly connected to the other side. The lower sealing cover 6, the conversion connector inner tube 7, and the threaded tube 16 are connected.

[0064] Furthermore, the upper sealing cover 2 is threadedly connected to the receiving cavity 41, and seals the variable diameter split slider mechanism and the rectangular connecting block sliding gasket 15 inside the receiving cavity 41. Tightening the upper sealing cover 2 can protect the variable diameter split slider mechanism, prevent it from coming out, and extend the service life of this quick conversion joint.

[0065] Furthermore, an axial compensation gasket 5 is fitted onto the inner tube 7 of the adapter. The lower sealing cover 6 is threadedly connected to the threaded tube 42, and the axial compensation gasket 5 is fixed inside the lower sealing cover 6. The axial compensation gasket 5 is a stepped axial compensation gasket, and includes a high-level rubber ring 501 and a low-level rubber ring 502 arranged coaxially in a stepped manner. Since the insertion depth of the φ65mm and φ80mm card-type interfaces 17 into this quick adapter differs by 5mm, in order to ensure sealing and connection stability, the high-level rubber ring 501 and the low-level rubber ring 502 are arranged in a stepped manner. The height difference between the two is set to 5mm. When the φ65mm card interface 17 is inserted into this quick adapter, its port is in close contact with the high-grade rubber ring 501. When the φ80mm card interface 17 is inserted into this quick adapter, its port is in close contact with the low-grade rubber ring 502. In this way, axial compensation can be achieved, ensuring the stability of the connection, and a sealing function can be played to prevent impurities such as mud and sand in the water from entering this quick adapter and thus affecting the service life of this quick adapter.

[0066] Furthermore, the variable diameter split slider mechanism includes a hexagonal integrated outer spring 3 and three sets of variable diameter split slider assemblies; the variable diameter split slider assembly includes an arc-shaped variable diameter split slider 19 and an arc-shaped variable diameter split slider 20. A rectangular connecting block 1901 is fixedly connected to the middle position of the bottom of the variable diameter split slider 19, and a rectangular connecting block 2001 is fixedly connected to the middle position of the bottom of the variable diameter split slider 20. The variable diameter split slider 19 and the variable diameter split slider 20 are arranged adjacent to each other to ensure that the snap-fit ​​interface 17 and this quick conversion connector are more secure and will not come off. At the same time, each variable diameter split slider has a gap of about 0.5mm above and below to facilitate sliding.

[0067] Furthermore, the inner diameter of the rectangular connecting block sliding pad 15 is the same as the inner diameter of the threaded pipe 42, and a plurality of rectangular sliding grooves 1501 are evenly provided on the rectangular connecting block sliding pad 15; both the rectangular connecting block 901 and the rectangular connecting block 1001 slide within the rectangular sliding grooves 1501.

[0068] Furthermore, a variable diameter split slider 2 inner spring baffle 11 is fixedly connected to the outer arc surface of the variable diameter split slider 2 10, and a quick connector spring claw 13 is movably arranged on the inner arc surface of the variable diameter split slider 2 10. The quick connector spring claw 13 abuts against the variable diameter split slider 2 inner spring baffle 11 through the variable diameter split slider 2 inner spring 12.

[0069] Furthermore, the outer arc surface of each variable diameter split slider 9 and the inner spring baffle 11 of each variable diameter split slider 10 are fixedly connected to the inner side of the hexagonal integrated outer spring 3 by rivets 14.

[0070] Furthermore, an anti-collision protective sleeve 1 is fixedly installed on the outer circumference of the upper sealing cover 2. Since the environment at the rescue site is very complex, the installation of the anti-collision protective sleeve 1 can effectively prevent the fire-fighting facilities from being damaged by collisions; a sealing rubber gasket 8 is movably fitted on the threaded pipe 16.

[0071] Furthermore, the variable diameter split slider mechanism is detachably snapped into the fire-fighting dedicated snap-fit ​​interface 17; the snap-fit ​​interface 17 compresses the variable diameter split slider one 9 and the variable diameter split slider two 10 for radial sliding. In the non-operating state, the three variable diameter split sliders one 9 and three variable diameter split sliders two 10 are tightly fitted together under the elastic action of the hexagonal integrated outer spring 3, at which time the inner diameter is φ65mm. When the φ65mm diameter snap-fit ​​interface 17 is inserted into this quick conversion connector, due to the hexagonal... The elasticity of the integral outer spring 3 is greater than that of the inner spring 12 of the variable diameter split slider 2. Therefore, only the quick-connect spring claw 13 slides radially at this time. The quick-connect spring claw 13 limits the groove on the card interface 17, thereby completing the docking. At this time, the inner diameter is still φ65mm. When it is necessary to insert the card interface 17 with a diameter of φ80mm into this quick-connect adapter, only a little force is needed to make the three variable diameter split sliders 1-9 and the three variable diameter split sliders 2-10 split radially at the same time, thus achieving the desired result. The purpose of the bayonet expansion is to simultaneously engage the quick-connect spring claw 13 with the groove of the clip-on connector 17, thereby completing the docking. At this time, the inner diameter is φ80mm. One end of the inner tube 7 of the adapter is fitted inside the clip-on connector 17. The outer diameter of the inner tube 7 of the adapter is the same as the inner diameter of the clip-on connector 17 with a diameter of φ65mm. Since the inner diameter of the circular through hole 21 on the upper sealing cover 2 is φ80mm, when the clip-on connector 17 with a diameter of φ65mm is connected to this quick-connect adapter, the tube wall does not contact the upper sealing cover 2, thus causing... Radial swaying and potential leakage are present. When the φ65mm diameter card-type interface 17 is inserted into this quick-change adapter, the inner tube 7 of the adapter is simultaneously inserted into the φ65mm diameter card-type interface 17. This stabilizes the card-type interface 17 and prevents leakage. The threaded pipe 16 is connected to the fixed fire hydrant, allowing water to flow smoothly through this quick-change adapter into the fire hose connected to the card-type interface 17. At the same time, the sealing rubber gasket 8 provides a good seal to prevent leakage.

[0072] In summary, both the φ65mm and φ80mm card-type interfaces 17 can be reliably connected to this quick converter, completely solving the problem of using the wrong or missing converter interface, which affects the speed of rescue. This greatly simplifies the preparation work for firefighters when responding to an emergency, reduces the weight and quantity of equipment carried by firefighters, and is easy to operate, saving time and effort.

[0073] Example 3

[0074] Combination Figures 1-11 Based on Embodiment 2, this embodiment provides a variable diameter quick-change connector and its usage and application, including the following steps:

[0075] S1. Take two quick-connect adapters;

[0076] S2. Connect the two threaded pipes 16 to the two ends of the matching connecting pipe respectively.

[0077] S3. Insert the card interface 17 into the variable diameter split slider mechanism of the two quick conversion joints respectively to extend the fire hose.

[0078] Furthermore, the two card interfaces 17 can be of different diameters and different standards, which can effectively solve the problem of connecting pipes of different diameters and standards in other fields.

[0079] Furthermore, this quick-connect adapter can also be used in fuel transportation, landscaping, farmland irrigation, building installation, vehicle systems, and chemical processes.

[0080] In the description of this invention, it should be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0081] Although the present invention has been described through specific embodiments, those skilled in the art will understand that various modifications and equivalent substitutions can be made to the invention without departing from its scope. Furthermore, various modifications can be made to the invention for specific situations or materials without departing from its scope. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims.

Claims

1. A variable diameter quick-connect fitting, comprising an upper sealing cover (2), a receiving cavity (4), and a lower sealing cover (6), characterized in that: The receiving cavity (4) includes a receiving cavity body (41) and a threaded tube (42). A threaded tube (42) is fixedly connected to the middle position below the bottom of the cavity (41). The threaded tube (42) is connected to the cavity (41). The cavity (41) contains a variable diameter split slider mechanism and a rectangular connecting block sliding pad (15). The rectangular connecting block sliding pad (15) is located below the variable diameter split slider mechanism. The top surface of the upper sealing cover (2) is provided with a circular through hole (21) with the same inner diameter as the threaded tube (42). The lower sealing cover (6) is fixedly connected to the inner tube (7) of the conversion connector on one side and to the second threaded tube (16) on the other side. The lower sealing cover (6), the inner tube (7) of the conversion connector and the second threaded tube (16) are connected in communication. The variable diameter split slider mechanism includes a hexagonal integrated outer spring (3) and three sets of variable diameter split slider combinations; The variable diameter split slider assembly includes an arc-shaped variable diameter split slider one (9) and an arc-shaped variable diameter split slider two (10). A rectangular connecting block one (901) is fixedly connected to the middle position of the bottom of the variable diameter split slider one (9), and a rectangular connecting block two (1001) is fixedly connected to the middle position of the bottom of the variable diameter split slider two (10). The variable diameter split slider one (9) and the variable diameter split slider two (10) are arranged adjacent to each other. The variable diameter split slider 2 (10) is fixedly connected to the outer arc surface of the variable diameter split slider 2 inner spring baffle (11), and the variable diameter split slider 2 (10) is movably provided with a quick connector spring claw (13) on the inner arc surface of the variable diameter split slider 2 (10). The quick connector spring claw (13) abuts against the variable diameter split slider 2 inner spring baffle (11) through the variable diameter split slider 2 inner spring (12).

2. The variable diameter quick-change connector according to claim 1, characterized in that: The upper sealing cover (2) is threadedly connected to the receiving cavity (41), and the variable diameter split slider mechanism and the rectangular connecting block sliding pad (15) are sealed inside the receiving cavity (41).

3. A variable diameter quick-change adapter according to claim 1, characterized in that: An axial compensation gasket (5) is fitted on the inner tube (7) of the conversion connector. The lower sealing cover (6) is threadedly connected to the threaded tube (42) and the axial compensation gasket (5) is fixed inside the lower sealing cover (6). The axial compensation pad (5) is a stepped axial compensation pad, which includes a high-order rubber ring (501) and a low-order rubber ring (502) arranged in a stepped manner on the same axis.

4. A variable diameter quick-connect coupling according to claim 1, characterized in that: The inner diameter of the rectangular connecting block sliding pad (15) is the same as the inner diameter of the threaded pipe (42), and multiple rectangular sliding grooves (1501) are evenly provided on the rectangular connecting block sliding pad (15). Both the first rectangular connecting block (901) and the second rectangular connecting block (1001) slide within the rectangular groove (1501).

5. A variable diameter quick-connect coupling according to claim 1, characterized in that: The outer arc surface of each of the variable diameter split sliders (9) and the inner spring baffle (11) of each of the variable diameter split sliders (10) are fixedly connected to the inner side of the hexagonal integrated outer spring (3) by rivets (14).

6. A variable diameter quick-connect coupling according to claim 1, characterized in that: An anti-collision protective sleeve (1) is fixedly provided on the outer circumferential surface of the upper sealing cover (2); A sealing rubber gasket (8) is movably fitted on the threaded pipe (16).

7. A method of using the variable diameter quick-change adapter according to any one of claims 1-6, characterized in that: The variable diameter split slider mechanism is detachably snapped into the fire-fighting dedicated card interface (17). The card interface (17) compresses the variable diameter split slider one (9) and the variable diameter split slider two (10) to slide radially; The quick connector spring claw (13) limits the groove on the card interface (17); One end of the inner tube (7) of the adapter is fitted into the card interface (17); The threaded pipe 2 (16) can be used after being connected to the fixed fire hydrant.

8. The application of a variable diameter quick-change coupling as described in any one of claims 1-6, characterized in that: Used for fuel transportation, landscaping, farmland irrigation, building installation, vehicle systems, and fire rescue.

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