A variable diameter fire-fighting interface

Abstract

This invention relates to the field of fire-fighting interface technology, specifically a variable-diameter fire-fighting interface. It includes an inner-locking interface with a large-diameter interface at its top, which is fitted onto the outer surface of the inner-locking interface. The top surface of the inner-locking interface is lower than the top surface of the large-diameter interface. A first thread is provided on the outer wall of the inner-locking interface, and a second thread is provided on the inner wall of the large-diameter interface. The inner-locking interface and the large-diameter interface are connected via the first and second threads. A small-diameter interface is also provided at the top of the inner-locking interface, located inside the large-diameter interface, and is detachably connected to the inner-locking interface. A limiting component is provided at the top of the large-diameter interface. In use, the inner-locking interface can be retracted to expose either the small-diameter or large-diameter interface, thus meeting the compatibility requirements of both KDK65Z and KDK80Z interfaces. This not only facilitates portability but also allows for use as an emergency interface, shortening firefighting time.

Description

Technical Field

[0001] This invention relates to the field of fire protection interface technology, specifically to a variable diameter fire protection interface. Background Technology

[0002] According to the national standard GB12514 "Fire Protection Interfaces", current types of fire protection interfaces include internal snap-fit ​​fire protection interfaces and clip-on fire protection interfaces. Clip-on interfaces are widely used due to their convenient installation and disassembly and good fixing effect. In addition, many areas use internal snap-fit ​​interfaces at water outlets. Therefore, in these areas, fire protection conversion interfaces with one end being internal snap-fit ​​and the other end being clip-on are often used, which can be adapted to the water outlet and also take advantage of the advantages of clip-on interfaces. Clip-on fire protection interfaces are available in various diameters, and different diameters have different size requirements. Commonly used models include KDK65Z and KDK80Z.

[0003] Currently, the diameter of fire hose connections cannot be changed. Therefore, in the event of a fire, especially when the fire is far from the water outlet, it is necessary to carry the two types of connections mentioned above. This increases the difficulty of carrying them, and in emergencies, one of the connections may be forgotten, delaying firefighting efforts. Summary of the Invention

[0004] The purpose of this invention is to provide a variable diameter fire-fighting interface that can expose either a small-diameter or large-diameter interface through the retraction of the inner-locking interface, thereby meeting the compatibility requirements of both KDK65Z and KDK80Z interfaces. It is not only convenient to carry, but can also be used as an emergency interface to shorten fire-fighting time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a variable-diameter fire hose coupling, comprising an inner snap-fit ​​interface, the top of which is provided with a large-diameter interface, the large-diameter interface being sleeved on the outer surface of the inner snap-fit ​​interface, the top surface of the inner snap-fit ​​interface being lower than the top surface of the large-diameter interface; a first thread is provided on the outer wall of the inner snap-fit ​​interface, and a second thread is provided on the inner wall of the large-diameter interface, the inner snap-fit ​​interface and the large-diameter interface being connected by the first thread and the second thread; a small-diameter interface is also provided on the top of the inner snap-fit ​​interface, the small-diameter interface being located inside the large-diameter interface, the small-diameter interface being detachably connected to the inner snap-fit ​​interface; a limiting component is provided on the top of the large-diameter interface.

[0006] Preferably, the top surface of the inner snap-fit ​​interface is provided with a groove, and the bottom surface of the small-diameter interface is provided with a first outward protrusion. The first outward protrusion extends into the groove. The inner wall of the groove is provided with a third thread, and the outer wall of the first outward protrusion is provided with a fourth thread. The inner snap-fit ​​interface and the small-diameter interface are connected by the third thread and the fourth thread. The inner wall of the large-diameter interface is provided with a first sealing cavity, a second sealing cavity, and a third sealing cavity from bottom to top. The top of the small-diameter interface is provided with a fourth sealing cavity. The second thread is provided between the first sealing cavity and the second sealing cavity, and the length of the second thread is less than the length of the first thread.

[0007] Preferably, the first sealing cavity is located below the bottom of the first thread.

[0008] Preferably, a gasket is provided between the inner buckle interface and the small diameter interface, and the gasket is located on the outside of the first outer protrusion.

[0009] Preferably, the large-diameter interface has an outwardly protruding ring at its top edge and a guide groove on its top surface; the limiting assembly includes a rotating cover, a rotating sealing cover, a snap-fit ​​sleeve, and a snap-fit ​​body; both the rotating cover and the rotating sealing cover are annular, the bottom surface of the rotating cover has a second outwardly protruding portion, the outer wall of the second outwardly protruding portion has a fifth thread, and the inner wall of the rotating sealing cover has a sixth thread; the rotating cover and the rotating sealing cover are connected by the fifth thread and the sixth thread; the rotating cover and the rotating sealing cover together form a sliding groove, the sliding groove is located inside the rotating sealing cover, the outwardly protruding ring extends into the sliding groove and can slide along the inner wall of the sliding groove; there are several guide grooves, and the several guide grooves are evenly distributed in a ring. The number of the snap-fit ​​sleeves is the same as the number of the guide grooves, and their positions correspond one-to-one. The snap-fit ​​sleeves can slide along the inner wall of the guide grooves. Each snap-fit ​​sleeve is provided with a snap-fit ​​body, and the snap-fit ​​body is detachably connected to the snap-fit ​​sleeve. The bottom of the rotating cover is provided with a receiving cavity. The inner wall of the receiving cavity is provided with a plurality of pushing blocks and a plurality of partitions. The number of pushing blocks and partitions is the same as the number of guide grooves. The positions of the pushing blocks and the partitions correspond one-to-one. The pushing blocks are located on the side away from the axis of the rotating cover, and the partitions are located on the side close to the axis of the rotating cover. The snap-fit ​​sleeve is located between two adjacent partitions and is located in the receiving cavity. The two ends of the snap-fit ​​sleeve are respectively attached to two pushing blocks.

[0010] Preferably, the push block has a triangular cross-section, and the tip of the push block faces the axis of the rotating cover.

[0011] Preferably, the guide groove is composed of two arc grooves and one inclined straight groove, with the two arc grooves located at the two ends of the inclined straight groove, and the arc grooves and the inclined straight grooves being connected.

[0012] Preferably, the buckle sleeve includes a support base, a mounting groove, a limiting plate, a clearance groove, and a guide post. The support base is arc-shaped. The mounting groove is located on the top surface of the support base. There are two limiting plates, both of which are located outside the mounting groove. The bottom of the limiting plates is fixedly connected to the bottom of the support base. The clearance groove is located on the bottom surface of the support base and between the two limiting plates. The clearance groove communicates with the mounting groove. The guide post is located in the middle of the bottom surface of the support base. The top of the guide post is fixedly connected to the support base. The bottom of the guide post extends into the guide groove and can slide along the inner wall of the guide groove. The bottom surface of the support base abuts against the top surface of the large-diameter interface and can slide along the top surface of the large-diameter interface.

[0013] Preferably, the buckle body is disposed in the mounting groove. The buckle body includes a baffle, a spring plate, and a protrusion. There are two spring plates, located at both ends of the baffle. The first end of the spring plate is fixedly connected to the baffle, and the second end of the spring plate abuts against the inner wall of the end of the mounting groove. The baffle is arc-shaped. The protrusion is fixed on the inner side wall of the baffle and located in the clearance groove. The protrusion extends out of the mounting groove. The inner side wall of the baffle abuts against the limiting plate. There is a gap between the outer side wall of the baffle and the inner side wall of the bearing seat. The bottom surface of the protrusion abuts against the top surface of the large-diameter interface and can slide along the top surface of the large-diameter interface.

[0014] Preferably, the length of the protrusion is less than the distance between two adjacent partitions.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (i) The present invention can expose a small-diameter interface or a large-diameter interface by retracting the inner interface, thereby meeting the matching requirements of both KDK65Z and KDK80Z interfaces. It is not only convenient to carry, but can also be used as an emergency interface to shorten the fire fighting time.

[0017] (ii) The internal threaded interface can only retract within the thread of the second thread through the first thread. During the spiral retraction process, the first sealing cavity is always below the bottom thread of the first thread, and the second sealing cavity is always above the top thread of the first thread. The thread is protected after the sealing ring is installed.

[0018] (iii) Twist the rotating cover by hand to rotate it. At this time, the push block pushes the buckle sleeve to slide along the inner wall of the guide groove and approach it. The buckle sleeve drives the buckle body on it to approach the axis of the large-diameter interface. Then the buckle body extends out of the receiving cavity. When the socket is inserted into the top of the large-diameter interface, it can lock the socket and ensure the stability of the connection between the socket and the fire interface. Attached Figure Description

[0019] Figure 1 This is an isometric view of the present invention;

[0020] Figure 2 This is an isometric view of the present invention with the rotating cover and rotating seal removed.

[0021] Figure 3 This is a front sectional view of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 6 This is an isometric view of the large-diameter interface in this invention;

[0025] Figure 7 This is an isometric sectional view of the large-diameter interface in this invention;

[0026] Figure 8 This is an isometric view of the rotating cover at one angle in this invention;

[0027] Figure 9 This is an isometric view of the rotating cover from another angle in this invention;

[0028] Figure 10 This is an isometric view of the rotary cap in this invention;

[0029] Figure 11 This is an isometric view of the snap-fit ​​sleeve in this invention;

[0030] Figure 12 This is an isometric view of the buckle body in this invention;

[0031] Figure 13 This is an isometric view of the buckle body and buckle sleeve when they are installed together in this invention.

[0032] The reference numerals in the figures include:

[0033] 1-Internal snap-fit ​​interface, 11-First thread, 12-Groove, 13-Third thread, 2-Large diameter interface, 21-Second thread, 22-First sealing cavity, 23-Second sealing cavity, 24-Third sealing cavity, 25-Outer convex ring, 26-Guide groove, 3-Small diameter interface, 31-First outer protrusion, 32-Fourth thread, 33-Fourth sealing cavity, 4-Gasket, 5-Rotating cover, 51-Second outer protrusion, 52-Fifth thread, 53-Receiving cavity, 54-Push block, 55-Partition plate, 6-Rotating cover, 61-Sixth thread, 7-Snap-fit ​​sleeve, 71-Bearing seat, 72-Mounting groove, 73-Limiting plate, 74-Allowing groove, 75-Guide post, 8-Snap-fit ​​body, 81-Baffle, 82-Spring sheet, 83-Protrusion, 9-Slide groove. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0035] Please see Figure 1-13 This invention provides a technical solution: a variable-diameter fire hose coupling, including an inner-locking interface 1, with a large-diameter interface 2 at its top, fitted onto the outer surface of the inner-locking interface 1, the top surface of the inner-locking interface 1 being lower than the top surface of the large-diameter interface 2. A first thread 11 is provided on the outer wall of the inner-locking interface 1, and a second thread 21 is provided on the inner wall of the large-diameter interface 2. The inner-locking interface 1 and the large-diameter interface 2 are connected by the first thread 11 and the second thread 21. A small-diameter interface 3 is also provided at the top of the inner-locking interface 1, located inside the large-diameter interface 2, and is detachably connected to the inner-locking interface 1. The inner-locking interface 1 can only retract within the thread of the second thread 21 via the first thread 11. Through thread retraction and distance limitation, the exposure and concealment of the large-diameter interface 2 and the small-diameter interface 3 are controlled. When the large-diameter interface 2 is exposed, it meets the assembly requirements of the KDK80Z connector; when the small-diameter interface 3 is exposed, it meets the assembly requirements of the KDK65Z connector. The top of the large-diameter interface 2 is equipped with a limiting component, which can lock the socket after it is inserted to ensure the stability of the connection between the socket and the fire interface.

[0036] When using this invention, please refer to [the relevant documentation / reference]. Figure 3At this point, the large-diameter interface 2 is exposed, meeting the assembly requirements of the KDK80Z connector. If the user needs to convert the interface type to the KDK65Z interface, the KDK65Z connector must first be inserted from the top of the large-diameter interface 2, secured by the limiting component. Then, holding the large-diameter interface 2, the inner-clipping interface 1 is rotated. Through the helical transmission of the first thread 11 and the second thread 21, the inner-clipping interface 1 moves axially upward relative to the large-diameter interface 2, exposing the KDK65Z interface. At this point, the KDK65Z connector can be connected to the small-diameter interface 3. Similarly, to convert from a KDK65Z interface to a KDK80Z interface, simply reverse the above process. This invention, through the retraction of the inner-clipping interface 1, can expose either the small-diameter interface 3 or the large-diameter interface 2, thus meeting the compatibility requirements of both KDK65Z and KDK80Z interfaces. It is not only convenient to carry but can also be used as an emergency interface, shortening firefighting time.

[0037] Please see Figure 3-4 The inner snap-fit ​​interface 1 has a groove 12 on its top surface and a first outward protrusion 31 on its bottom surface. The first outward protrusion 31 is annular, and the shape of the groove 12 matches the shape of the first outward protrusion 31. The first outward protrusion 31 extends into the groove 12. A third thread 13 is provided on the inner wall of the groove 12, and a fourth thread 32 is provided on the outer wall of the first outward protrusion 31. The inner snap-fit ​​interface 1 and the small-diameter interface 3 are connected by the engagement of the third thread 13 and the fourth thread 32. A washer 4 is also provided between the inner snap-fit ​​interface 1 and the small-diameter interface 3, and the washer 4 is located outside the first outward protrusion 31. By screwing the small-diameter interface 3, the small-diameter interface 3 can be installed onto or removed from the inner snap-fit ​​interface 1 through the engagement of the third thread 13 and the fourth thread 32. When the first outward protrusion 31 is screwed into the groove 12 and contacts the bottom of the groove 12, the small-diameter interface 3 and the inner snap-fit ​​interface 1 will be fixed together with the engagement of the washer 4, making it difficult for them to rotate relative to each other. Therefore, when the large diameter interface 2 is pressed down and the inner snap interface 1 is rotated, the small diameter interface 3 can move up and down together with the inner snap interface 1, and the small diameter interface 3 will not separate from the inner snap interface 1.

[0038] Please see Figure 3 and Figure 7 The inner wall of the large-diameter interface 2 is provided with a first sealing cavity 22, a second sealing cavity 23, and a third sealing cavity 24 from bottom to top, and the top of the small-diameter interface 3 is provided with a fourth sealing cavity 33. A second thread 21 is located between the first sealing cavity 22 and the second sealing cavity 23, and the length of the second thread 21 is less than the length of the first thread 11. (See also...) Figure 3 and Figure 5The first sealing cavity 22 is located below the bottom of the first thread 11. The inner thread interface 1 can only retract within the thread of the second thread 21 through the first thread 11. During the spiral retraction process, the first sealing cavity 22 is always below the bottom thread of the first thread 11, and the second sealing cavity 23 is always above the top thread of the first thread 11. After the sealing ring is installed, the thread is protected. Example

[0039] Please see Figure 2 , Figure 5-7 The large-diameter interface 2 has an outward protruding ring 25 at the top edge and a guide groove 26 on the top surface of the large-diameter interface 2. The limiting component includes a rotating cover 5, a rotating sealing cover 6, a snap sleeve 7 and a snap body 8.

[0040] Please see Figure 8 and Figure 10 Both the rotating cover 5 and the rotating sealing cover 6 are annular. Please refer to [link / reference]. Figure 5 , Figure 9-10 The bottom surface of the rotating cover 5 has a second outward protrusion 51, and the outer wall of the second outward protrusion 51 has a fifth thread 52. The inner wall of the rotating cover 6 has a sixth thread 61. The rotating cover 5 and the rotating cover 6 are connected by the fifth thread 52 and the sixth thread 61. The rotating cover 5 and the rotating cover 6 are fixed together and do not easily rotate relative to each other. Therefore, when the rotating cover 6 is turned, the rotating cover 5 will rotate together with it, and the rotating cover 5 and the rotating cover 6 will not separate.

[0041] Please see Figure 5 The rotating cover 5 and the rotating sealing cover 6 together form a sliding groove 9, which is located inside the rotating sealing cover 6. The outer protruding ring 25 extends into the sliding groove 9 and can slide along the inner wall of the sliding groove 9. Therefore, when the rotating sealing cover 6 is turned, the rotating sealing cover 6 will drive the rotating cover 5 to rotate together at the top of the large-diameter interface 2. The rotating cover 5 and the rotating sealing cover 6 also together form a connecting groove, which is located outside the rotating sealing cover 6, and a rubber ring is fitted inside the connecting groove.

[0042] Please see Figure 2 and Figure 6 There are several guide grooves 26, which are evenly distributed in a ring. Each guide groove 26 consists of two arc grooves and one inclined straight groove. The two arc grooves are located at the two ends of the inclined straight groove, and the arc grooves and the inclined straight groove are connected. The arcs of the guide grooves 26 are equal, with one end close to the axis of the large-diameter interface 2 and the other end away from the axis of the large-diameter interface 2. The number of snap-fit ​​sleeves 7 is the same as the number of guide grooves 26, and their positions correspond one-to-one. The snap-fit ​​sleeves 7 can slide along the inner wall of the guide groove 26. Each snap-fit ​​sleeve 7 is provided with a snap-fit ​​body 8, and the snap-fit ​​body 8 is detachably connected to the snap-fit ​​sleeve 7.

[0043] Please see Figure 8-9The bottom of the rotating cover 5 has a receiving cavity 53. The inner wall of the receiving cavity 53 is provided with several pushing blocks 54 and several partitions 55. The number of pushing blocks 54 and partitions 55 is the same as the number of guide grooves 26 to ensure the coaxiality of the rotating cover 5 and the large-diameter interface 2. The positions of the pushing blocks 54 and the partitions 55 correspond one-to-one. The pushing blocks 54 are located on the side away from the axis of the rotating cover 5, and the partitions 55 are located on the side closer to the axis of the rotating cover 5. A snap-fit ​​sleeve 7 is located between two adjacent partitions 55 and within the receiving cavity 53. The two ends of the snap-fit ​​sleeve 7 are respectively attached to two pushing blocks 54. The cross-section of the pushing block 54 is triangular, and the tip of the pushing block 54 faces the axis of the rotating cover 5.

[0044] Please see Figure 1-2 and Figure 13 Twist the rotating cover 6 by hand, causing the rotating cover 5 to rotate as well. At this time, the pushing block 54 pushes the latching sleeve 7 to slide along the inner wall of the guide groove 26 and approach it. The latching sleeve 7 then moves the latching body 8 on it closer to the axis of the large-diameter interface 2. Subsequently, the latching body 8 extends out of the receiving cavity 53, and can lock the socket when it is inserted into the top of the large-diameter interface 2. To release the socket, simply twist the rotating cover 6 in the opposite direction.

[0045] Please see Figure 11 The snap-fit ​​sleeve 7 includes a support base 71, a mounting groove 72, a limiting plate 73, a clearance groove 74, and a guide post 75. The support base 71 is arc-shaped. The mounting groove 72 is located on the top surface of the support base 71. There are two limiting plates 73, both located outside the mounting groove 72, with their bottoms fixedly connected to the bottom of the support base 71. The clearance groove 74 is located on the bottom surface of the support base 71, between the two limiting plates 73, and communicates with the mounting groove 72. The guide post 75 is located in the middle of the bottom surface of the support base 71, with its top fixedly connected to the support base 71. The bottom of the guide post 75 extends into the guide groove 26 and can slide along the inner wall of the guide groove 26. The bottom surface of the support base 71 abuts against the top surface of the large-diameter interface 2 and can slide along the top surface of the large-diameter interface 2.

[0046] Please see Figure 12-13The buckle body 8 is located within the mounting groove 72. The buckle body 8 includes a baffle 81, a spring plate 82, and a protrusion 83. There are two spring plates 82, located at opposite ends of the baffle 81. The first end of the spring plate 82 is fixedly connected to the baffle 81, and the second end of the spring plate 82 abuts against the inner wall of the end of the mounting groove 72. The baffle 81 is arc-shaped, and the protrusion 83 is fixed to the inner wall of the baffle 81 and located within the clearance groove 74, closely abutting the inner walls of both sides of the clearance groove 74. The protrusion 83 extends outside the mounting groove 72. Under the elastic force of the spring plate 82, the inner wall of the baffle 81 abuts against the limiting plate 73, and there is a gap between the outer wall of the baffle 81 and the inner wall of the bearing seat 71. Therefore, the buckle body 8 is confined within the mounting groove 72 and will not detach from the buckle sleeve 7. The bottom surface of the protrusion 83 abuts against the top surface of the large-diameter interface 2 and can slide along the top surface of the large-diameter interface 2. The length of the protrusion 83 is less than the distance between two adjacent partitions 55, so the protrusion 83 will not collide with the partitions 55 when it extends out of or retracts into the receiving cavity 53.

[0047] In use, the process of locking the connector using the limiting component is as follows: after the connector is inserted into the top of the large-diameter interface 2, the rotating cover 6 is turned by hand, causing the rotating cover 5 to rotate as well. The pushing block 54 pushes the support seat 71 to move. The support seat 71 causes the bottom guide post 75 to slide along the inner wall of the guide groove 26. The support seat 71 slides along the top surface of the large-diameter interface 2, moving from the arc area away from the axis of the large-diameter interface 2 to the arc area close to the axis of the large-diameter interface 2. During this process, the support seat 71 moves the latching body 8 together. The protrusion 83 in the latching body 8 slides along the top surface of the large-diameter interface 2, leaves the receiving cavity 53, and extends out from between the two adjacent partitions 55 to lock the connector.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A variable-diameter fire hose coupling, comprising an internal snap-fit ​​connector, characterized in that: The top of the inner snap-fit ​​interface is provided with a large-diameter interface, which is sleeved on the outer surface of the inner snap-fit ​​interface, and the top surface of the inner snap-fit ​​interface is lower than the top surface of the large-diameter interface. The outer wall of the inner snap-fit ​​interface is provided with a first thread, and the inner wall of the large-diameter interface is provided with a second thread. The inner snap-fit ​​interface and the large-diameter interface are connected by the first thread and the second thread. The top of the inner buckle interface is also provided with a small diameter interface, which is located inside the large diameter interface. The small diameter interface and the inner buckle interface are detachably connected. A limiting component is provided at the top of the large-diameter interface; The large-diameter interface has an outward protruding ring at its top edge and a guide groove on its top surface. The limiting component includes a rotating cover, a rotating sealing cover, a snap sleeve, and a snap body; Both the rotating cover and the rotating sealing cover are annular. The bottom surface of the rotating cover is provided with a second outward protrusion, and the outer wall of the second outward protrusion is provided with a fifth thread. The inner wall of the rotating sealing cover is provided with a sixth thread. The rotating cover and the rotating sealing cover are connected by the fifth thread and the sixth thread. The rotating cover and the rotating sealing cover together form a sliding groove, the sliding groove is located inside the rotating sealing cover, and the outer convex ring extends into the sliding groove and can slide along the inner wall of the sliding groove; There are several guide grooves, which are evenly distributed in a ring. The number of buckle sleeves is the same as the number of guide grooves, and their positions correspond one-to-one. The buckle sleeves can slide along the inner wall of the guide grooves. Each of the aforementioned buckle sleeves is provided with a buckle body, and the buckle body is detachably connected to the buckle sleeve; The bottom of the rotating cover is provided with a receiving cavity. The inner wall of the receiving cavity is provided with a plurality of pushing blocks and a plurality of partitions. The number of pushing blocks and partitions is the same as the number of guide grooves. The positions of the pushing blocks and the partitions correspond one-to-one. The pushing blocks are located on the side away from the axis of the rotating cover, and the partitions are located on the side close to the axis of the rotating cover. The buckle sleeve is located between two adjacent partitions and within the receiving cavity, with its two ends respectively abutting the two push blocks; When the rotating cover and the rotating sealing cover rotate together in the forward direction, the pushing block can push the buckle sleeve to move in the forward direction along the guide groove, so that the buckle sleeve drives the buckle body away from the receiving cavity and extends out from between two adjacent partitions; When the rotating cover and the rotating sealing cover rotate in opposite directions together, the pushing block can push the buckle sleeve to move in the opposite direction along the guide groove, so that the buckle sleeve drives the buckle body to retract into the receiving cavity.

2. The variable diameter fire-fighting interface according to claim 1, characterized in that: The top surface of the inner buckle interface is provided with a groove, and the bottom surface of the small diameter interface is provided with a first outward protrusion. The first outward protrusion extends into the groove. The inner wall of the groove is provided with a third thread, and the outer wall of the first outward protrusion is provided with a fourth thread. The inner buckle interface and the small diameter interface are connected by the third thread and the fourth thread. The inner wall of the large-diameter interface is provided with a first sealing cavity, a second sealing cavity and a third sealing cavity from bottom to top, and the top of the small-diameter interface is provided with a fourth sealing cavity; The second thread is located between the first sealing cavity and the second sealing cavity, and the length of the second thread is less than the length of the first thread.

3. The variable diameter fire-fighting interface according to claim 2, characterized in that: The first sealing cavity is located below the bottom of the first thread.

4. The variable diameter fire-fighting interface according to claim 2, characterized in that: A gasket is also provided between the inner buckle interface and the small diameter interface, and the gasket is located on the outside of the first outer protrusion.

5. The variable diameter fire-fighting interface according to claim 1, characterized in that: The push block has a triangular cross-section, and the tip of the push block faces the axis of the rotating cover.

6. The variable diameter fire-fighting interface according to claim 1, characterized in that: The guide groove is composed of two circular arc grooves and one inclined straight groove. The two circular arc grooves are located at the two ends of the inclined straight groove, and the circular arc grooves and the inclined straight groove are connected.

7. The variable diameter fire-fighting interface according to claim 1, characterized in that: The buckle sleeve includes a support base, a mounting groove, a limiting plate, a clearance groove, and a guide post. The support base is arc-shaped. The mounting groove is located on the top surface of the support base. There are two limiting plates, both located outside the mounting groove. The bottom of the limiting plates is fixedly connected to the bottom of the support base. The clearance groove is located on the bottom surface of the support base and between the two limiting plates. The clearance groove communicates with the mounting groove. The guide post is located in the middle of the bottom surface of the support base. The top of the guide post is fixedly connected to the support base. The bottom of the guide post extends into the guide groove and can slide along the inner wall of the guide groove. The bottom surface of the support base abuts against the top surface of the large-diameter interface and can slide along the top surface of the large-diameter interface.

8. The variable diameter fire-fighting interface according to claim 7, characterized in that: The buckle body is disposed in the mounting groove. The buckle body includes a baffle, a spring plate, and a protrusion. There are two spring plates, located at both ends of the baffle. The first end of the spring plate is fixedly connected to the baffle, and the second end of the spring plate abuts against the inner wall of the end of the mounting groove. The baffle is arc-shaped. The protrusion is fixed on the inner side wall of the baffle and located in the clearance groove. The protrusion extends out of the mounting groove. The inner side wall of the baffle abuts against the limiting plate. There is a gap between the outer side wall of the baffle and the inner side wall of the bearing seat. The bottom surface of the protrusion abuts against the top surface of the large-diameter interface and can slide along the top surface of the large-diameter interface.

9. The variable diameter fire-fighting interface according to claim 8, characterized in that: The length of the protrusion is less than the distance between two adjacent partitions.

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