A hydrant quick connect fitting

Abstract

A fire hydrant quick connection joint comprises a connecting main body and a quick connection assembly; the connecting main body is through at both ends, one end is provided with a hose connector, and the other end is provided with the quick connection assembly; the quick connection assembly comprises a plurality of buckling bodies and a movable sleeve; the buckling bodies are circumferentially distributed around the outer periphery of the end of the connecting main body and form a ring, and the movable sleeve is axially slidably sleeved on the outer periphery of the connecting main body and the buckling bodies; the buckling bodies are circumferentially limited and pivotally connected to the connecting main body and have quick connection parts protruding from the end of the connecting main body, and the inner wall of the quick connection part is provided with a threaded structure; the axial sliding of the movable sleeve enables the quick connection parts of the buckling bodies to move radially inward or outward; when the quick connection parts move radially inward, an inwardly retracted quick connection port is formed, and the inner wall of the inwardly retracted quick connection port forms an internal thread composed of the threaded structures; when the quick connection parts move radially outward, an outwardly expanded quick connection port is formed. By using the outwardly expandable and inwardly retractable quick connection port, the quick connection port with external threads can be quickly screwed with the fire hydrant interface, so that the hose and the fire hydrant are quickly connected.

Description

Technical Field

[0001] This utility model relates to the technical field of fire-fighting equipment, and in particular to a quick-connect connector for fire hydrants. Background Technology

[0002] Fire hydrants, formally known as fire suppression hydrants, are divided into indoor and outdoor fire hydrants. They are fixed fire-fighting facilities whose main function is to control combustibles, isolate oxidizers, and eliminate ignition sources. Fire hydrants primarily allow fire trucks to draw water from municipal water supply networks or outdoor fire water supply networks for firefighting. They can also be directly connected to hoses and nozzles to extinguish fires.

[0003] Existing fire hydrant connectors typically have a threaded structure, requiring multiple turns to lock the threads when connecting them to the threaded ends of hose fittings. However, hose fittings are usually large and heavy, making the connection to the fire hydrant connector time-consuming and laborious. Furthermore, rust and other impurities often accumulate at the fire hydrant connector due to water accumulation, further complicating the connection and making rotation even more difficult, hindering firefighting operations. Utility Model Content

[0004] The purpose of this invention is to provide a quick-connect connector for fire hydrants, which has the advantage of being convenient and quick to connect to fire hydrants, thereby improving fire extinguishing efficiency.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A quick-connect fitting for fire hydrants includes a connecting body and a quick-connect assembly;

[0007] The connecting body is open at both ends, with a water hose connector at one end and the quick-connect component at the other end;

[0008] The quick-connect assembly includes several arc-shaped fasteners and a movable sleeve; each fastener is circumferentially distributed around the outer periphery of the end of the connecting body and forms a ring, and the movable sleeve is axially slidably fitted around the outer periphery of the connecting body and each fastener.

[0009] Each fastening body is circumferentially limited and pivotally connected to the connecting body and has a quick-connect portion protruding from the end of the connecting body. The radial inner wall of the quick-connect portion is provided with a threaded structure. The axial sliding of the movable sleeve allows the quick-connect portion of each fastening body to move radially inward or outward. When each quick-connect portion moves radially inward, it forms an inwardly recessed quick-connect interface, and the inner wall of the inwardly recessed quick-connect interface forms an internal thread composed of various threaded structures. When each quick-connect portion moves radially outward, it forms an outwardly expanding quick-connect interface.

[0010] Furthermore, the middle part of the fastening body is circumferentially limited and pivotally connected to the connecting body, allowing both the inner and outer ends of the fastening body to swing radially; the outer end of the fastening body forms the quick-connect portion; the inner end of the fastening body tapers, creating a clearance gap between the circumferential ends of adjacent fastening bodies; the movable sleeve is used to restrict the swing of the quick-connect portion of the fastening body; and when the movable sleeve is in the first position, it surrounds each quick-connect portion, restricting the quick-connect portion from radially moving outward, keeping the quick-connect interface in an inward state; when the movable sleeve is in the second position, it disengages from each quick-connect portion, allowing the quick-connect portion to move radially outward, enabling the quick-connect interface to expand outward.

[0011] Furthermore, at least one of the fastening bodies has a protruding pin on its radial outer wall; the movable sleeve has a guide groove for the pin to pass through, and a first positioning hole and a second positioning hole are respectively provided at both ends of the guide groove, and the movable sleeve switches between the first position and the second position by switching the position of the pin along the guide groove between the first positioning hole and the second positioning hole.

[0012] Furthermore, the guide groove includes a middle slide groove, a first slide groove, and a second slide groove; the middle slide groove extends axially and its length ensures that the sliding of the movable sleeve can disengage from or surround each quick-connect part; the first slide groove and the second slide groove extend circumferentially at both ends of the middle slide groove, and the extension directions of the first slide groove and the second slide groove are opposite; the end of the first slide groove away from the middle slide groove is the first positioning hole, and the end of the second slide groove away from the middle slide groove is the second positioning hole.

[0013] Furthermore, each fastener has a pin at the same position; the extension direction of the second slide groove is opposite to the locking direction of the quick-connect internal thread and the fire hydrant interface; the diameter of the second positioning hole is larger than the outer diameter of the pin; the pin is locked to the locking hole on the radial outer wall of the fastener by means of threaded locking.

[0014] Furthermore, the outer peripheral sidewall of the end where the quick-connect component is installed on the upper end of the connecting body forms an installation part and an annular movable groove; the installation part is recessed with a plurality of circumferentially spaced slots, and adjacent slots are separated by a locking block; a pivot block protrudes from the middle of the fastening body, and the pivot block can be oscillatingly inserted into the slot, and is circumferentially limited by the locking block; the annular movable groove is recessed below the installation part to allow the inner end of the fastening body to move when it swings.

[0015] Furthermore, a sleeve is provided below the annular movable groove of the connecting body, and the top surface of the sleeve is for the inner end face of each fastening body to abut; the movable sleeve slides on the outer wall of the sleeve.

[0016] Furthermore, the quick-connect assembly also includes several elastic elements, each of which is used to assist in resisting the outward expansion of each quick-connect part.

[0017] Furthermore, an elastic element is provided between each circumferentially adjacent fastening body, and the two ends of the elastic element are installed in the recesses provided on the circumferential sidewall of the quick-connect part of the fastening body. The elastic element is a spring.

[0018] Furthermore, the number of fastening bodies is six; a sealing gasket is also provided inside the quick-connect interface, and the sealing gasket is located on the outer side of the end face of the connecting body.

[0019] After adopting the above technical solution, during use, the hose connector of the main body can be pre-connected to the hose. Then, by sliding the movable sleeve of the quick-connect component, the quick-connect interface is made to expand outward, allowing it to quickly wrap around the fire hydrant interface. The thread structure of each quick-connect interface can also initially align with the external thread of the fire hydrant interface. Next, the movable sleeve drives each quick-connect part to retract inward, that is, the quick-connect interface becomes retracted so that each quick-connect part can tightly grip the fire hydrant interface. At the same time, by slightly rotating the quick-connect connector, the complete internal thread formed in the retracted quick-connect interface can be firmly threadedly locked with the external thread of the fire hydrant interface. This enables convenient and quick connection of hoses and fire hydrants. Compared with the existing structure, it can reduce the number of rotations, save manpower, effectively improve the connection efficiency of hoses and fire hydrants, and improve fire rescue efficiency. Attached Figure Description

[0020] Figure 1 This is a perspective view of an embodiment of the present utility model, showing the quick-connect interface in a retracted state;

[0021] Figure 2 for Figure 1 Top view;

[0022] Figure 3 for Figure 2 Sectional view at point AA;

[0023] Figure 4 for Figure 1 The main view;

[0024] Figure 5 for Figure 4 Sectional view at BB;

[0025] Figure 6 for Figure 1 Exploded view;

[0026] Figure 7 for Figure 3 Sectional view at CC;

[0027] Figure 8 This is a perspective view of an embodiment of the present utility model, showing the quick-access interface in an expanded state;

[0028] Figure 9 for Figure 8 The main view;

[0029] Figure 10 for Figure 8 A sectional view.

[0030] Labeling: Quick Connector 10, Connecting Body 1, Hose Connector 11, Mounting Part 12, Slot 121, Slot Block 122, Annular Movable Groove 13, Sleeve Part 14, Quick Connect Assembly 2, Fastening Body 3, Quick Connect Part 31, Threaded Structure 32, Quick Connect Interface 33, Internal Thread 34, Inner End 35, Clearance 36, Recessed Hole 37, Locking Hole 38, Pivot Block 39, Movable Sleeve 4, Guide Groove 41, First Positioning Hole 411, Second Positioning Hole 412, Intermediate Slide Groove 413, First Slide Groove 414, Second Slide Groove 415, Elastic Element 5, Pin 6, Sealing Gasket 7. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] like Figures 1 to 10 As shown, a quick-connect connector 10 for fire hydrants in this embodiment includes a connecting body 1 and a quick-connect component 2.

[0033] The connecting body 1 is open at both ends, with a water hose connector 11 at one end and the quick-connect component 2 at the other end.

[0034] The quick-connect assembly 2 includes several arc-shaped fasteners 3 and a movable sleeve 4; each fastener 3 is circumferentially distributed around the outer periphery of the end of the connecting body 1 and forms a ring, and the movable sleeve 4 can be axially slidably fitted onto the connecting body 1 and the outer periphery of each fastener 3.

[0035] Each fastening body 3 is circumferentially limited and pivotally connected to the connecting body 1 and has a quick-connect portion 31 protruding from the end of the connecting body 1. The radial inner wall of the quick-connect portion 31 is provided with a threaded structure 32. The movable sleeve 4 slides axially so that the quick-connect portion 31 of each fastening body 3 can move radially inward or outward. When each quick-connect portion 31 moves radially inward, it forms an inwardly recessed quick-connect interface 33. The inner wall of the inwardly recessed quick-connect interface 33 forms an internal thread 34 composed of each threaded structure 32. When each quick-connect portion 31 moves radially outward, it forms an outwardly expanding quick-connect interface 33.

[0036] Therefore, in use, the hose connector 11 of the connecting body 1 can be pre-connected to the hose (not shown), and then the quick-connect assembly 2 can be slid by sliding the movable sleeve 4 to make the quick-connect part 33 expand outward, so that it can quickly wrap around the fire hydrant interface (not shown), and the thread structure 32 of the quick-connect part 33 can also initially align with the external thread of the fire hydrant interface; then the movable sleeve 4 drives the quick-connect part 31 to retract inward, that is, the quick-connect part 33 becomes retracted so that the quick-connect part 31 can tightly hug the fire hydrant interface, and at the same time, slightly rotate the quick-connect connector 10, so that the complete internal thread 34 formed in the retracted quick-connect part 33 can be firmly threadedly locked with the external thread of the fire hydrant interface, thereby facilitating and quickly realizing the quick connection operation of the hose and the fire hydrant.

[0037] Specifically, the fastening body 3 is circumferentially limited and pivotally connected to the connecting body 1 in the middle, allowing both the inner and outer ends of the fastening body 3 to swing radially in the axial direction; the outer end of the fastening body 3 forms the quick-connect part 31; the inner end 35 of the fastening body 3 gradually narrows, forming a clearance gap 36 between the circumferential of adjacent inner ends 35 of the fastening body 3; the internal thread 34 of the quick-connect interface 33 in the inward state can be screwed into the external thread of the fire hydrant interface; in the outward expansion state of the quick-connect interface 33, the fire hydrant interface can be directly and quickly inserted into the quick-connect interface 33.

[0038] The movable sleeve 4 can be used to limit the swing of the quick-connect part 31 of the fastening body 3; and when the movable sleeve 4 is in the first position, it can surround each quick-connect part 31, restricting the quick-connect part 31 from moving radially outward, so that the quick-connect interface 33 remains in the inward state; when the movable sleeve 4 is in the second position, it disengages from each quick-connect part 31, and the quick-connect part 31 can move radially outward, so that the quick-connect interface 33 can expand outward.

[0039] Therefore, by sliding the movable sleeve 4 of the quick-connect assembly 2 to the second position, since there is a clearance gap 36 between the inner ends 35 of the fastening body 3 in the circumferential direction, the inner ends 35 of each fastening body 3 can be radially retracted, and at the same time, each quick-connect part 31 is driven to swing radially outward, so that the quick-connect interface 33 is in an outward expansion shape, so that it can quickly wrap around the fire hydrant interface; then slide the movable sleeve 4 to the first position, so that the movable sleeve 4 drives each quick-connect part 31 to retract inward, that is, so that the quick-connect interface 33 becomes inward state.

[0040] Preferably, the number of the fasteners 3 can be six, but it can also be two, three, etc. Setting it to six allows the quick-connect interface 33 to be expanded to a suitable size more conveniently, and also facilitates product assembly.

[0041] To further improve the quick-connect speed, the quick-connect assembly 2 in this embodiment also includes several elastic members 5. Each elastic member 5 is used to assist in pushing against each quick-connect part 31 to expand outward, so that when the movable sleeve 4 releases the restriction on each quick-connect part 31, each quick-connect part 31 can achieve rapid automatic expansion.

[0042] Specifically, in this embodiment, an elastic element 5 is provided between the circumferentially adjacent fastening bodies 3. The two ends of the elastic element 5 can be installed in the recesses 37 provided on the circumferential sidewall of the quick-connect part 31 of the fastening body 3. Taking a spring as an example, the elastic element 5 can provide elastic force to open the two fastening bodies 3 circumferentially. Since the middle part of the fastening body 3 is hinged to the connecting body 1, the elastic force of the elastic element 5 can also drive the quick-connect part 31 to move radially outward while separating the fastening bodies 3 circumferentially, so as to automatically expand outward and always keep the quick-connect interface 33 in the expanded state, which is convenient for docking and connecting with the fire hydrant interface.

[0043] To facilitate the sliding of the movable sleeve 4, a protruding pin 6 can be provided on the radial outer wall of at least one fastening body 3. The movable sleeve 4 is provided with a guide groove 41 for the pin 6 to pass through, and a first positioning hole 411 and a second positioning hole 412 are respectively provided at both ends of the guide groove 41. The movable sleeve 4 can switch between the first position and the second position by using the pin 6 to switch the position between the first positioning hole 411 and the second positioning hole 412 along the guide groove 41.

[0044] In this embodiment, pins 6 are provided at the same positions on each fastening body 3, so the corresponding movable sleeve 4 is provided with six guide grooves 41, which can achieve better sliding.

[0045] Specifically, the guide groove 41 can pass through the movable sleeve 4 internally and externally and includes a middle slide groove 413, a first slide groove 414, and a second slide groove 415. The middle slide groove 413 extends axially and its length ensures that the sliding of the movable sleeve 4 can disengage from or surround each quick-connect part 31. The first slide groove 414 and the second slide groove 415 are respectively circumferentially extended at both ends of the middle slide groove 413, and the extension directions of the first slide groove 414 and the second slide groove 415 are opposite. The end of the first slide groove 414 away from the middle slide groove 413 is the first positioning hole 411, and the end of the second slide groove 415 away from the middle slide groove 413 is the second positioning hole 412. In this embodiment, the quick-connect component 2 is located at the upper end of the connecting body 1, and the first positioning hole 411 and the first slide groove 414 are both located on the lower side of the middle slide groove 413, while the second positioning hole 412 and the second slide groove 415 are both located on the upper side of the middle slide groove 413.

[0046] Therefore, see Figure 4 After the movable sleeve 4 moves upward and rotates counterclockwise (from a top-down view), each pin 6 can move downward relative to the central slide groove 413 and rotate clockwise into the first slide groove 414 and be located in the first positioning hole 411. At this time, the movable sleeve 4 is in the first position, maintaining the restriction on each quick-connect part 31, and the upper and lower limits of the pins 6 are located in the first slide groove 414, so that the movable sleeve 4 will not slide up and down arbitrarily. When it is necessary to switch the movable sleeve 4 to the second position to release each quick-connect part 31, refer to Figure 8The movable sleeve 4 can be rotated clockwise around its circumference, then moved downwards, and then rotated clockwise again. Each pin 6 can then rotate counterclockwise relative to the movable sleeve 4 along the first slide groove 414 into the middle slide groove 413, then move upwards along the middle slide groove 413, and then rotate counterclockwise along the second slide groove 415 into the second positioning hole 412. At this time, the movable sleeve 4 is in the second position, disengaging downwards from each quick-connect part 31, which facilitates the expansion of each elastic member 5 to the quick-connect interface 33.

[0047] Furthermore, the extension direction of the second slide groove 415 can be set to be opposite to the locking direction of the internal thread 34 of the quick-connect interface 33 and the fire hydrant interface, so as to prevent the movable sleeve 4 from disengaging from the second slide groove 415 when rotating the locking device.

[0048] Furthermore, the diameter of the second positioning hole 412 can be slightly larger than the outer diameter of the pin 6, so that the pin 6 can swing together with the fastening body 3 when it swings, preventing the pin 6 from getting stuck.

[0049] In this embodiment, the pin 6 can be locked to the locking hole 38 provided on the radial outer wall of the fastener 3 by means of threaded fastening, so as to facilitate product assembly.

[0050] In this embodiment, the outer peripheral sidewall of the end of the quick-connect component 2 installed on the upper end of the connecting body 1 forms an installation part 12 and an annular movable groove 13, which are distributed vertically.

[0051] The mounting part 12 is recessed with several circumferentially spaced slots 121, and adjacent slots 121 are separated by a locking block 122; the fastening body 3 has a pivot block 39 protruding from the middle, which can be swung into the slot 121 and is limited circumferentially by the locking block 122 to prevent the fastening body 3 from moving circumferentially along the connecting body 1, ensuring that the quick-connect interface 33 formed by the quick-connect parts 31 of each fastening body 3 can be stably locked with the fire hydrant interface, and also ensuring that the movable sleeve 4 can rotate circumferentially relative to the fastening body 3.

[0052] The annular movable groove 13 is recessed below the mounting part 12 and is used to allow the inner end 35 of the fastener 3 to make room when it swings.

[0053] Below the annular movable groove 13 of the connecting body 1, a sleeve part 14 may also be provided. The top surface of the sleeve part 14 can be abutted by the inner end 35 of each fastener 3 to facilitate product assembly. Moreover, the sleeve part 14 can also be fitted to the inner wall of the movable sleeve 4 when it is fitted, so that the movable sleeve 4 can be tightly slid against the outer wall of the sleeve part 14, which can improve the compactness of the product structure and the overall stability.

[0054] In this embodiment, the hose connector 11 takes the structure of a common internal snap-fit ​​fire hose connector as an example (the figure is a schematic drawing). Of course, threaded fire hose connectors or clip-on fire hose connectors can also be used, but it is not limited to this embodiment and is not the focus of this application's improvement.

[0055] In this embodiment, a sealing gasket 7 made of rubber or other materials may also be provided inside the quick-connect interface 33. The sealing gasket 7 is located on the outer side of the end face of the connecting body 1 and is used for leak-proof sealing between the quick-connect interface 33 and the fire hydrant interface.

[0056] In summary, the quick-connect coupling 10 of this embodiment utilizes the pre-connection body 1 to fix the hose, and then the cooperation of the fastening parts 3 and the movable sleeve 4 of the quick-connect assembly 2 allows the quick-connect interface 33 to expand outward. The elastic element 5 enables the quick-connect interface 33 to expand automatically and quickly, facilitating the insertion of the fire hydrant interface. The movable sleeve 4 then slides to retract the quick-connect interface 33, causing each quick-connect part 31 to grip the fire hydrant interface. A slight rotation then achieves quick locking and fixation between the internal thread 34 of the quick-connect interface 33 and the external thread of the fire hydrant interface. Simultaneously, the movable sleeve 4 also grips the fire hydrant interface, ensuring a stable and reliable connection between the quick-connect assembly 2 and the fire hydrant interface. The entire connection process is also less susceptible to the effects of rusted external threads, eliminating the need for frequent and laborious rotation of the quick-connect coupling 10, thus increasing the connection speed between the hose and the fire hydrant and improving fire rescue efficiency.

[0057] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0058] In the description of the embodiments of this application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use, or the orientations or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

Claims

1. A quick-connect coupling for fire hydrants, characterized in that: Includes the main connector and quick-connect components; The connecting body is open at both ends, with a water hose connector at one end and the quick-connect component at the other end; The quick-connect assembly includes several arc-shaped fasteners and a movable sleeve; each fastener is circumferentially distributed around the outer periphery of the end of the connecting body and forms a ring, and the movable sleeve is axially slidably fitted around the outer periphery of the connecting body and each fastener. Each fastening body is circumferentially limited and pivotally connected to the connecting body and has a quick-connect portion protruding from the end of the connecting body. The radial inner wall of the quick-connect portion is provided with a threaded structure. The axial sliding of the movable sleeve allows the quick-connect portion of each fastening body to move radially inward or outward. When each quick-connect portion moves radially inward, it forms an inwardly recessed quick-connect interface, and the inner wall of the inwardly recessed quick-connect interface forms an internal thread composed of various threaded structures. When each quick-connect portion moves radially outward, it forms an outwardly expanding quick-connect interface.

2. The quick-connect coupling for a fire hydrant according to claim 1, characterized in that: The fastening body is circumferentially limited and pivotally connected to the connecting body in the middle, allowing both the inner and outer ends of the fastening body to swing radially in the axial direction; the outer end of the fastening body forms the quick-connect portion; the inner end of the fastening body tapers, creating a clearance gap between the circumferential ends of adjacent fastening bodies; the movable sleeve is used to restrict the swing of the quick-connect portion of the fastening body; and when the movable sleeve is in the first position, it surrounds each quick-connect portion, restricting the quick-connect portion from radially moving outward, keeping the quick-connect interface in an inward state; when the movable sleeve is in the second position, it disengages from each quick-connect portion, allowing the quick-connect portion to move radially outward, enabling the quick-connect interface to expand outward.

3. A quick-connect coupling for fire hydrants according to claim 2, characterized in that: At least one fastening body has a protruding pin on its radial outer wall; the movable sleeve has a guide groove for the pin to pass through, and a first positioning hole and a second positioning hole are respectively provided at both ends of the guide groove; the movable sleeve switches between the first position and the second position by switching the position of the pin along the guide groove between the first positioning hole and the second positioning hole.

4. A quick-connect coupling for fire hydrants according to claim 3, characterized in that: The guide groove includes a middle slide groove, a first slide groove, and a second slide groove. The middle slide groove extends axially and its length ensures that the sliding of the movable sleeve can disengage from or surround each quick-connect part. The first slide groove and the second slide groove extend circumferentially at both ends of the middle slide groove, and the extension directions of the first slide groove and the second slide groove are opposite. The end of the first slide groove away from the middle slide groove is the first positioning hole, and the end of the second slide groove away from the middle slide groove is the second positioning hole.

5. A quick-connect coupling for fire hydrants according to claim 4, characterized in that: Each fastener has a pin at the same position; the extension direction of the second slide groove is opposite to the locking direction of the quick-connect internal thread and the fire hydrant interface; the diameter of the second positioning hole is larger than the outer diameter of the pin; the pin is locked to the locking hole on the radial outer wall of the fastener by means of threaded locking.

6. A quick-connect coupling for fire hydrants according to claim 2, characterized in that: The outer peripheral sidewall of the end of the connecting body where the quick-connect component is installed forms a mounting part and an annular movable groove; the mounting part is recessed with a number of circumferentially spaced slots, and adjacent slots are separated by locking blocks; a pivot block protrudes from the middle of the fastening body, and the pivot block can be oscillatingly inserted into the slot, and is circumferentially limited by the locking block; the annular movable groove is recessed below the mounting part to allow the inner end of the fastening body to move when it swings.

7. A quick-connect coupling for fire hydrants according to claim 6, characterized in that: Below the annular movable groove of the connecting body, there is also a sleeve part, the top surface of which is for the inner end face of each fastening body to abut; the movable sleeve slides on the outer wall of the sleeve part.

8. A quick-connect coupling for fire hydrants according to claim 1, characterized in that: The quick-connect assembly also includes several elastic elements, each of which is used to assist in pushing against each quick-connect part for outward expansion.

9. A quick-connect coupling for fire hydrants according to claim 8, characterized in that: An elastic element is provided between each of the circumferentially adjacent fastening bodies. The two ends of the elastic element are installed in the recesses provided on the circumferential sidewall of the quick-connect part of the fastening body. The elastic element is a spring.

10. A quick-connect coupling for fire hydrants according to claim 1, characterized in that: The number of fasteners is six; a sealing gasket is also provided inside the quick-connect interface, and the sealing gasket is located on the outer side of the end face of the connecting body.

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