Quick connector

Abstract

This utility model discloses a quick-connect coupling, including a first connector and a second connector that can be plugged into each other. The first connector includes a threaded first socket and a tube. The first socket includes a first stop portion protruding radially from its peripheral wall, and the tube includes a second stop portion protruding radially from its peripheral wall. The first connector also includes a locking sleeve, which includes an annular portion confined between the first and second stop portions and a cylindrical portion surrounding the tube. The cylindrical portion has a guide groove and a locking groove. The second connector includes a connecting tube and a locking pin provided on the peripheral wall of the connecting tube. The locking pin of this utility model can cooperate with the guide groove and locking groove on the locking sleeve to lock the first connector and the second connector together, improving the assembly and disassembly efficiency and connection strength of the quick-connect coupling. Furthermore, the first socket and the tube of the first connector can cooperate to fix the position of the locking sleeve, facilitating the assembly and disassembly of the locking sleeve.

Description

Technical Field

[0001] This utility model belongs to the field of connector technology, specifically relating to a quick-connect connector. Background Technology

[0002] In fields such as chemical engineering, petroleum, shipbuilding, and industrial automation, the need for rapid connection and disconnection of pipelines in fluid transport systems is extremely common. Currently, two sections of fluid transport pipe are often connected using quick-connect fittings. A quick-connect fitting consists of two detachable connectors. The two connectors are installed on the two sections of the transport pipe respectively, and then the two connectors are assembled together to connect the two sections of the transport pipe.

[0003] Existing quick-connect couplings have significant drawbacks in practical applications: First, the connection process is complex and time-consuming, resulting in high labor intensity for operators, especially in confined spaces or high-altitude working environments, where the connection difficulty is further aggravated; Second, the stability after connection is insufficient, and the coupling is prone to loosening under conditions such as high pressure, vibration, or temperature changes, which seriously affects the safety and reliability of fluid transportation.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a quick-connect connector that solves the problems of complex structure and poor stability after assembly.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a quick-connect connector, which includes a first connector and a second connector that can be plugged into each other. The first connector includes a threaded first tube seat and a tube. The first tube seat includes a first stop portion protruding radially from its peripheral wall, and the tube includes a second stop portion protruding radially from its peripheral wall. The first connector also includes a locking sleeve, which includes an annular portion confined between the first stop portion and the second stop portion, and a cylindrical portion surrounding the tube. The cylindrical portion is provided with a guide groove extending from its side away from the first tube seat toward a direction closer to the first tube seat, and a locking groove extending from the guide groove near the first tube seat toward a direction away from the first tube seat. The second connector includes a connecting tube and a locking pin provided on the peripheral wall of the connecting tube. When the quick-connect connector is in an assembled state, the tube is inserted into the connecting tube, the connecting tube is located between the tube and the locking sleeve, and the locking pin passes through the guide groove and the locking groove in sequence and is locked in the locking groove.

[0007] In one or more embodiments of the present invention, the second connector further includes a second tube seat threaded onto the connecting tube, the connecting tube including a third stop portion that protrudes radially from its peripheral wall and is located outside the second tube seat; the second connector further includes a pin ring sleeved on the second tube seat, the pin ring being restricted between the end faces of the third stop portion and the second tube seat, and the locking pin being disposed on the pin ring.

[0008] In one or more embodiments of the present invention, the locking pin includes a pin portion that passes through the pin ring and a plate portion disposed between the connecting tube and the pin ring.

[0009] In one or more embodiments of the present invention, the connecting pipe further includes a boss portion that protrudes radially from its peripheral wall. The boss portion is located between the end faces of the third stop portion and the second pipe seat. The peripheral wall of the boss portion is provided with a relief groove extending to the side of the boss portion near the second pipe seat. The plate portion of the locking pin is disposed in the relief groove.

[0010] In one or more embodiments of this utility model, the insertion tube includes a first accommodating cavity, and the first connector further includes a movable valve core and a first elastic element disposed in the first accommodating cavity. The movable valve core has a mating groove on the side away from the first tube seat, and the first elastic element abuts against the movable valve core on the side near the first tube seat. The connecting tube includes a second accommodating cavity, and the second connector further includes a fixed valve core disposed in the second accommodating cavity. The fixed valve core has a protruding mating portion on the side near the first connector. When the quick-connect connector is in the assembled state, the mating portion is inserted into the mating groove, the fixed valve core abuts against the movable valve core, and drives the movable valve core to squeeze the first elastic element.

[0011] In one or more embodiments of this utility model, the second connector further includes a valve core sleeve fitted on the fixed valve core and a second elastic member abutting against the valve core sleeve on the side away from the first connector. A fourth receiving groove is recessed on the inner wall of the connecting tube, and a fourth sealing ring is provided in the fourth receiving groove. When the quick-connect connector is in the disassembled state, the fourth sealing ring is fitted on the valve core sleeve. When the quick-connect connector is in the assembled state, the fourth sealing ring is fitted on the insertion tube, the insertion tube abuts against the valve core sleeve, and drives the valve core sleeve to squeeze the second elastic member.

[0012] In one or more embodiments of this utility model, the first receiving cavity includes a large-diameter section and a small-diameter section arranged sequentially along a direction away from the first tube seat; when the quick-connect connector is in the disassembled state, the moving valve core is at least partially located in the small-diameter section and blocks the small-diameter section; when the quick-connect connector is in the assembled state, the moving valve core is located in the large-diameter section to connect the first receiving cavity and the second receiving cavity.

[0013] In one or more embodiments of this utility model, the locking sleeve is rotatable about its central axis.

[0014] In one or more embodiments of this utility model, the guide groove extends spirally on the cylindrical portion.

[0015] In one or more embodiments of this utility model, the second stop portion abuts against the end face of the first tube seat.

[0016] Compared with the prior art, the locking pin of this utility model can cooperate with the guide groove and locking groove on the locking sleeve to lock the first connector and the second connector together, thereby improving the assembly and disassembly efficiency and connection strength of the quick-connect connector. Furthermore, the first tube seat and the insertion tube of the first connector can cooperate to fix the position of the locking sleeve, facilitating the assembly and disassembly of the locking sleeve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the first connector in one embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the second connector in one embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the quick-connect connector in a disassembled state according to one embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the quick-connect connector in an assembled state according to one embodiment of the present invention;

[0022] Figure 5 This is a three-dimensional structural diagram of the quick-connect connector in an assembled state according to an embodiment of the present invention;

[0023] Figure 6 This is a perspective view of the quick-connect connector in a disassembled state according to one embodiment of the present invention;

[0024] Figure 7 This is an exploded structural diagram of the first connector in one embodiment of the present invention;

[0025] Figure 8 This is an exploded structural diagram of the second connector in one embodiment of the present invention.

[0026] Key reference numerals in the attached drawings: 1. First connector; 11. First pipe seat; 111. First stop; 112. First receiving groove; 12. Insert tube; 121. Second stop; 122. First receiving cavity; 1221. Large diameter section; 1222. Small diameter section; 13. Locking sleeve; 131. Ring; 132. Cylindrical section; 1321. Guide groove; 1322. Locking groove; 14. Moving valve core; 141. Connecting groove; 142. Second receiving groove; 15. First elastic element; 16. First sealing ring; 17. Second seal. 2. Second connector, 21. Second pipe seat, 211. Third receiving groove, 22. Connecting pipe, 221. Third stop, 222. Boss, 2221. Clearance groove, 223. Second receiving cavity, 224. Fourth receiving groove, 23. Pin ring, 24. Locking pin, 241. Pin part, 242. Plate part, 25. Fixed valve core, 251. Joint part, 252. Fifth receiving groove, 26. Valve core sleeve, 27. Second elastic element, 28. Third sealing ring, 29. Fourth sealing ring, 210. Fifth sealing ring. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", 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 utility model 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 limitations on this utility model.

[0029] Furthermore, the terms "second" and "first" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "second" or "first" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In one embodiment, reference is made to Figures 1 to 6As shown, this utility model provides a quick-connect fitting, which includes a first connector 1 and a second connector 2. The first connector 1 and the second connector 2 are respectively used to be installed on different conveying pipes. After the first connector 1 and the second connector 2 are plugged into each other, the two conveying pipes can be connected together.

[0031] The main structure of the first connector 1 includes a first tube seat 11, a insertion tube 12, and a locking sleeve 13. The first tube seat 11 is used to connect to a delivery pipeline. One end of the insertion tube 12 is threaded into the interior of the first tube seat 11, and the other end extends to the exterior of the first tube seat 11 and is used to insert into the second connector 2. The locking sleeve 13 is fitted onto the first tube seat 11 and can rotate about its central axis. The locking sleeve 13 includes a cylindrical portion 132 surrounding the insertion tube 12, and the space formed between the cylindrical portion 132 and the insertion tube 12 allows the second connector 2 to be inserted.

[0032] Furthermore, the cylindrical portion 132 of the locking sleeve 13 can also be combined with the radially protruding locking pin 24 on the second connector 2 to lock the first connector 1 and the second connector 2, preventing the first connector 1 and the second connector 2 from separating from each other after assembly.

[0033] Specifically, the cylindrical portion 132 of the locking sleeve 13 is provided with a guide groove 1321 and a locking groove 1322. The guide groove 1321 extends from the side of the cylindrical portion 132 away from the first tube seat 11 toward the direction closer to the first tube seat 11. The guide groove 1321 extends on the cylindrical portion 132 approximately along a spiral line. The locking groove 1322 extends from the side of the guide groove 1321 close to the first tube seat 11 toward the direction away from the first tube seat 11.

[0034] During the assembly of the first connector 1 and the second connector 2, the locking pin 24 first enters the guide groove 1321, and then moves along the guide groove 1321 to the locking groove 1322. After entering the locking groove 1322, the locking pin 24 moves away from the first connector 1, moving as close as possible to the part of the locking groove 1322 that is relatively close to the second connector 2. The guide groove 1321 and the locking groove 1322 together form a hook-like groove structure to catch the locking pin 24 on the second connector 2, preventing the first connector 1 and the second connector 2 from separating.

[0035] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 5As shown, to facilitate the fixing of the locking sleeve 13 and prevent it from moving along its central axis, a radially protruding first stop portion 111 is formed on the peripheral wall of the first tube seat 11, and a radially protruding second stop portion 121 is formed on the peripheral wall of the insertion tube 12. The second stop portion 121 abuts against the end face of the first tube seat 11. The locking sleeve 13 includes an integrally connected ring portion 131 and a cylindrical portion 132. The ring portion 131 is sleeved on the first tube seat 11 and is confined between the first stop portion 111 and the second stop portion 121. The cylindrical portion 132 extends from the side of the ring portion 131 away from the first stop portion 111 toward the side away from the first stop portion 111. The cylindrical portion 132 also surrounds the insertion tube 12, thereby wrapping the portion of the insertion tube 12 located outside the first tube seat 11, and forming a space between the cylindrical portion 132 and the insertion tube 12 for the insertion of the second connector 2.

[0036] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 5 As shown, the internal valve core structure of the first connector 1 includes a moving valve core 14 and a first elastic element 15. Both the moving valve core 14 and the first elastic element 15 are located in the first accommodating cavity 122 of the insertion tube 12. The first elastic element 15 has a certain elasticity and can be a metal spring or a rubber spring or other elastic component.

[0037] Specifically, the first accommodating cavity 122 includes a large-diameter section 1221 and a small-diameter section 1222 arranged sequentially along a direction away from the first tube seat 11. A stop structure is formed on the moving valve core 14. The first elastic member 15 is basically located within the large-diameter section 1221, and the first elastic member 15 also abuts against the stop structure on the moving valve core 14. When the quick-connect connector is in the disassembled state, the first connector 1 and the second connector 2 are separated from each other. At this time, the first elastic member 15 is squeezed by the moving valve core 14, providing the moving valve core 14 with an elastic force away from the first tube seat 11. Through this elastic force, the stop structure of the moving valve core 14 is held against the junction of the large-diameter section 1221 and the small-diameter section 1222. At this time, the part of the moving valve core 14 located within the small-diameter section 1222 can block the small-diameter section 1222, separating the first accommodating cavity 122 from the external space.

[0038] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, in order to improve the sealing performance of the first connector 1, a first receiving groove 112 is provided on the inner wall of the first tube seat 11, and a first sealing ring 16 is provided in the first receiving groove 112. When the insertion tube 12 is threaded into the inside of the first tube seat 11, the first sealing ring 16 is just fitted on the insertion tube 12, which can seal the gap between the first tube seat 11 and the insertion tube 12.

[0039] Furthermore, a second receiving groove 142 is provided on the peripheral wall of the moving valve core 14, and a second sealing ring 17 is provided in the second receiving groove 142. When the quick connector is in the disassembled state, the second sealing ring 17 can seal the gap between the moving valve core 14 and the insertion tube 12.

[0040] In one embodiment, reference is made to Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the main structure of the second connector 2 includes a second pipe seat 21, a connecting pipe 22, and a pin ring 23. The second pipe seat 21 is used to connect to the conveying pipeline. One end of the connecting pipe 22 is threaded to the inside of the second pipe seat 21, and the other end extends to the outside of the second pipe seat 21 and is used to insert into the space between the insert tube 12 and the locking sleeve 13. The locking pin 24 is sleeved on the part of the connecting pipe 22 located outside the second pipe seat 21 and is located on the pin ring 23.

[0041] Furthermore, in order to fix the pin ring 23 and prevent the pin ring 23 from moving along its central axis, a radially protruding third stop portion 221 is formed on the peripheral wall of the connector 22 at the part of the connector 22 located outside the second tube seat 21, and the pin ring 23 is restricted between the third stop portion 221 and the end face of the second tube seat 21.

[0042] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 6 As shown, the locking pin 24 and the pin ring 23 are separate structures. The locking pin 24 includes a pin portion 241 and a plate portion 242 that are integrally connected and coaxially arranged. The cross-sections of the pin portion 241 and the plate portion 242 are circular, and the diameter of the plate portion 242 is larger than the diameter of the pin portion 241. The plate portion 242 is constrained between the connecting tube 22 and the pin ring 23. The pin portion 241 penetrates the annular wall of the pin ring 23 radially and protrudes from the outer wall of the pin ring 23.

[0043] Considering that the plate portion 242 of the locking pin 24 will separate the connecting tube 22 and the pin ring 23, resulting in a large gap between the connecting tube 22 and the pin ring 23, the pin ring 23 may become loose.

[0044] To avoid the above situation, a boss 222 is formed on the part of the connector 22 located outside the second pipe seat 21, protruding radially from its peripheral wall. The boss 222 is located between the end faces of the third stop 221 and the second pipe seat 21, and also abuts against the end face of the second pipe seat 21. The thickness of the boss 222 is less than the thickness of the third stop 221. The peripheral wall of the boss 222 is close to the inner wall of the pin ring 23, and a relief groove 2221 is provided on the peripheral wall of the boss 222. The plate portion 242 of the locking pin 24 is provided in the relief groove 2221.

[0045] Furthermore, when assembling the connecting pipe 22 and the pin ring 23, in order to facilitate the locking pin 24 entering the clearance groove 2221, the clearance groove 2221 extends to the side of the boss portion 222 near the second pipe seat 21. When assembling the connecting pipe 22 and the pin ring 23, first assemble the locking pin 24 and the pin ring 23 together, then align the connecting pipe 22 with the pin ring 23, and align the side opening of the clearance groove 2221 with the plate portion 242 of the locking pin 24, and then fit the pin ring 23 onto the connecting pipe 22.

[0046] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 6 As shown, the internal valve core structure of the second connector 2 includes a fixed valve core 25, a valve core sleeve 26, and a second elastic element 27. A second accommodating cavity 223 is formed in the connecting pipe 22, and the fixed valve core 25, the valve core sleeve 26, and the second elastic element 27 are all located in the second accommodating cavity 223.

[0047] The fixed valve core 25 is roughly I-shaped, with relatively large diameters at both ends and relatively small diameters in the middle. A valve core sleeve 26 is fitted onto the end of the fixed valve core 25 furthest from the second pipe seat 21. The second elastic element 27 abuts against the valve core sleeve 26 and provides an elastic force to the valve core sleeve 26 away from the second pipe seat 21. The second elastic element 27 has a certain degree of elasticity and can be a metal spring or a rubber spring, among other elastic components.

[0048] When the quick-connector is in the disassembled state, the fixed valve core 25 and the valve core sleeve 26 together block the second receiving cavity 223, separating the second receiving cavity 223 from the external space.

[0049] When the quick-connect connector is in the assembled state, the insertion tube 12 of the first connector 1 is inserted into the second accommodating cavity 223 and abuts against the valve core sleeve 26 of the second tube seat 21, driving the valve core 14 sleeve to move closer to the second tube seat 21, causing the valve core sleeve 26 to disengage from the fixed valve core 25, creating a gap between the valve core sleeve 26 and the fixed valve core 25. At the same time, the fixed valve core 25 of the second connector 2 abuts against the movable valve core 14 of the first tube seat 11, driving the movable valve core 14 to move closer to the first tube seat 11, causing the movable valve core 14 to move into the large-diameter section 1221 of the first accommodating cavity 122. The small-diameter section 1222 of the first accommodating cavity 122 connects with the gap between the valve core sleeve 26 and the fixed valve core 25, thereby connecting the first accommodating cavity 122 and the second accommodating cavity 223.

[0050] Furthermore, after the first connector 1 and the second connector 2 are assembled together, the elastic force provided by the first elastic element 15 and the second elastic element 27 can also stably lock the locking pin 24 in the locking groove 1322, preventing the locking pin 24 from disengaging from the locking groove 1322.

[0051] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, in order to improve the sealing performance of the second connector 2, a third receiving groove 211 is provided on the inner wall of the second pipe seat 21, and a third sealing ring 28 is provided in the third receiving groove 211. When the connecting pipe 22 is threaded into the inside of the second pipe seat 21, the third sealing ring 28 is fitted onto the connecting pipe 22 to seal the gap between the second pipe seat 21 and the connecting pipe 22.

[0052] Furthermore, a fourth receiving groove 224 is recessed on the inner wall of the connecting pipe 22, and a fourth sealing ring 29 is provided within the fourth receiving groove 224. When the quick-connect connector is in the disassembled state, the fourth sealing ring 29 is fitted onto the valve core sleeve 26 to seal the gap between the valve core sleeve 26 and the connecting pipe 22. When the quick-connect connector is in the assembled state, the fourth sealing ring 29 is fitted onto the insertion tube 12 to seal the gap between the insertion tube 12 and the connecting pipe 22.

[0053] Furthermore, a fifth receiving groove 252 is provided on the peripheral wall of the end of the fixed valve core 25 away from the second pipe seat 21, and a fifth sealing ring 210 is provided in the fifth receiving groove 252. When the quick connector is in the disassembled state, the fifth sealing ring 210 is located between the fixed valve core 25 and the valve core sleeve 26, sealing the gap between the fixed valve core 25 and the valve core sleeve 26.

[0054] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, the moving valve core 14 has a mating groove 141 on the side away from the first pipe seat 11, and the fixed valve core 25 has a protruding mating portion 251 on the side away from the first pipe seat 11. When assembling the first connector 1 and the second connector 2, the mating portion 251 is located on the side of the fixed valve core 25 closer to the first connector 1. After the mating portion 251 is aligned with the mating groove 141, the first connector 1 and the second connector 2 are inserted together. After the moving valve core 14 and the fixed valve core 25 abut against each other, the mating portion 251 is inserted into the mating groove 141, preventing the moving valve core 14 and the fixed valve core 25 from shifting along their contact surface.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification 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 quick-connect connector, characterized in that, The quick-connect connector includes a first connector (1) and a second connector (2) that can be plugged into each other. The first connector (1) includes a threaded first tube seat (11) and a tube (12). The first tube seat (11) includes a first stop portion (111) that protrudes radially from its peripheral wall. The tube (12) includes a second stop portion (121) that protrudes radially from its peripheral wall. The first connector (1) also includes a locking sleeve (13). The locking sleeve (13) includes an annular portion (131) that is confined between the first stop portion (111) and the second stop portion (121), and a cylindrical portion (132) that surrounds the tube (12). The cylindrical portion (132) is provided with a guide groove (1321) that extends from the side away from the first tube seat (11) toward the direction close to the first tube seat (11), and a locking groove (1322) that extends from the side of the guide groove (1321) close to the first tube seat (11) toward the direction away from the first tube seat (11). The second connector (2) includes a connecting pipe (22) and a locking pin (24) disposed on the peripheral wall of the connecting pipe (22). When the quick-connector is in the assembled state, the insertion tube (12) is inserted into the connecting tube (22), the connecting tube (22) is inserted between the insertion tube (12) and the locking sleeve (13), and the locking pin (24) is locked in the locking groove (1322) via the guide groove (1321).

2. The quick-connect coupling according to claim 1, characterized in that, The second connector (2) further includes a second pipe seat (21) threaded onto the connecting pipe (22), the connecting pipe (22) including a third stop (221) that protrudes radially from its peripheral wall and is located outside the second pipe seat (21). The second connector (2) also includes a pin ring (23) sleeved on the second tube seat (21), the pin ring (23) being restricted between the third stop (221) and the end face of the second tube seat (21), and the locking pin (24) being provided on the pin ring (23).

3. The quick-connect connector according to claim 2, characterized in that, The locking pin (24) includes a pin portion (241) that passes through the pin ring (23) and a plate portion (242) disposed between the connecting tube (22) and the pin ring (23).

4. The quick-connect coupling according to claim 3, characterized in that, The connecting pipe (22) also includes a boss (222) that protrudes radially from its peripheral wall. The boss (222) is located between the end face of the third stop (221) and the second pipe seat (21). The peripheral wall of the boss (222) is provided with a relief groove (2221) extending to the side of the boss that is close to the second pipe seat (21). The plate portion (242) of the locking pin (24) is located in the relief groove (2221).

5. The quick-connect coupling according to claim 1, characterized in that, The cannula (12) includes a first accommodating cavity (122), and the first connector (1) further includes a moving valve core (14) and a first elastic element (15) disposed in the first accommodating cavity (122). The moving valve core (14) has a connecting groove (141) on the side away from the first tube seat (11), and the first elastic element (15) abuts against the side of the moving valve core (14) near the first tube seat (11). The connecting pipe (22) includes a second accommodating cavity (223), and the second connector (2) also includes a fixed valve core (25) disposed in the second accommodating cavity (223). The fixed valve core (25) has a protruding connecting part (251) on the side near the first connector (1). When the quick-connector is in the assembled state, the connecting part (251) is inserted into the connecting groove (141), the fixed valve core (25) abuts against the moving valve core (14), and drives the moving valve core (14) to squeeze the first elastic member (15).

6. The quick-connect coupling according to claim 5, characterized in that, The second connector (2) further includes a valve core sleeve (26) sleeved on the fixed valve core (25) and a second elastic member (27) abutting against the valve core sleeve (26) on the side away from the first connector (1). A fourth receiving groove (224) is recessed on the inner wall of the connecting pipe (22), and a fourth sealing ring (29) is provided in the fourth receiving groove (224). When the quick-connector is in the disassembled state, the fourth sealing ring (29) is fitted onto the valve core sleeve (26); When the quick-connector is in the assembled state, the fourth sealing ring (29) is sleeved on the insertion tube (12), the insertion tube (12) abuts against the valve core sleeve (26), and drives the valve core sleeve (26) to squeeze the second elastic element (27).

7. The quick-connect connector according to claim 5, characterized in that, The first accommodating cavity (122) includes a large-diameter section (1221) and a small-diameter section (1222) arranged sequentially along a direction away from the first tube seat (11). When the quick-connector is in the disassembled state, the moving valve core (14) is at least partially located in the small diameter section (1222) and blocks the small diameter section (1222). When the quick-connector is in the assembled state, the moving valve core (14) is located in the large diameter section (1221) to connect the first accommodating cavity (122) and the second accommodating cavity (223).

8. The quick-connect coupling according to claim 1, characterized in that, The locking sleeve (13) is rotatable about its central axis.

9. The quick-connect coupling according to claim 1, characterized in that, The guide groove (1321) extends spirally on the cylindrical part (132).

10. The quick-connect coupling according to claim 1, characterized in that, The second stop (121) abuts against the end face of the first tube seat (11).

Images