Quick connector

Abstract

The invention provides a quick connector which comprises a shell, a passage and a valve structure are arranged in the shell, and a first connecting end and a second connecting end are arranged at the two ends of the shell respectively. The first connecting end or the second connecting end is connected with an external air source or an external liquid source or an external container; the male plug is connected with the first connecting end or the second connecting end; the valve structure comprises a valve element, and the valve structure is used for controlling a passage between the first connecting end and the second connecting end to be connected or disconnected. And a locking mechanism is arranged at the end part of the shell, and the locking / separation between the shell and the male plug is realized by using the locking mechanism. The connector has the beneficial effects that the size of the connector is effectively controlled, so that the connector can be applied to more use scenes with narrow use spaces, a clamping jaw structure with a smoother contact surface is adopted, a clamping jaw made of a non-metal material can be used according to actual use requirements, and damage to a male plug is further reduced.

Description

Technical Field

[0001] The invention belongs to the field of mechanical structures, and in particular relates to a quick connector. Background Art

[0002] Existing quick connectors are often limited in their use in confined spaces due to their large dimensions (particularly diameter and length). This is due to the need to integrate multiple key functions within this limited space: enabling rapid plugging and unplugging, a built-in reliable valve to prevent backflow, ensuring high fluid flow, and accommodating the wide dimensional tolerances of the male plug when used as a female connector. Furthermore, to prevent scratches or indentations on male connectors made of soft materials (such as aluminum alloys) during connection, the guiding structure (such as the ball bearing) requires special consideration (e.g., the use of flexible claws) to reduce the risk of damage.

[0003] However, existing designs often struggle to balance these performance requirements while maintaining a compact design. For example, adding components to prevent seal failure or meet operational requirements often sacrifices compactness. Furthermore, the risk of damage to the male connector from the guide structure remains unresolved. Therefore, there is an urgent need to develop a new quick connector structure that meets these multiple performance requirements, maintains a simple structure, maintains a compact form factor, and avoids damage to the male connector. Summary of the Invention

[0004] In view of this, the present invention aims to provide a quick connector to at least solve one of the problems in the background technology.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: A quick connector includes a housing, a passage and a valve structure are configured in the housing, and two ends of the housing are respectively configured as a first connection end and a second connection end; Connecting the first connection end or the second connection end to an external gas source, an external liquid source, or an external container; The male plug is connected to the first connection end or the second connection end; The valve structure includes a valve core, and the valve structure is used to control the connection / interruption of the passage between the first connection end and the second connection end. Specifically, in response to the male plug being inserted into the housing, the passage between the first connection end and the second connection end is connected through the valve structure; in response to the male plug being removed from the housing, the passage between the first connection end and the second connection end is interrupted by the valve structure. A locking mechanism is arranged at the end of the shell, and the locking mechanism is used to achieve locking / separation between the shell and the male plug.

[0006] Furthermore, the shell includes a claw fixing seat and a rear connecting seat, and a first sealing ring is provided between the connecting portion of the claw fixing seat and the rear connecting seat.

[0007] Furthermore, the outer wall of the tail portion of the valve core is recessed inward to form a first accommodating cavity, and the first accommodating cavity has an opening toward one end of the housing; The first end of the first spring is arranged in the first accommodating cavity, and the other end extends from the opening of the first accommodating cavity (51) to abut against the inner wall of the shell.

[0008] Furthermore, a retaining ring is provided outside the first accommodating cavity of the valve core, and the stopper is limited between the retaining ring and the claw fixing seat; Furthermore, the block is replaced by a protection mechanism, which is limited between the retaining ring and the claw fixing seat, and a second accommodating cavity for accommodating a second sealing ring to be protected is formed between the first end of the protection mechanism and the outside of the first accommodating cavity of the valve core. The second end of the protection mechanism is abutted against the housing through a second spring, and the second sealing ring is arranged between the valve core and the claw fixing seat.

[0009] Furthermore, a sealing rubber ring in contact with the male plug is provided at one end of the valve core away from the first accommodating cavity, and a conducting hole is provided on the valve core body and is arranged on the side of the second sealing ring facing the sealing rubber ring; Preferably, the angle between the center line of the guide hole and the center line of the valve core is 30°-60°.

[0010] Furthermore, the locking mechanism includes an outer sleeve arranged outside the claw fixing seat, and the outer sleeve is arranged at the junction of the claw fixing seat and the rear connecting seat; A third accommodating cavity for accommodating a third spring is provided in the outer sleeve. One end of the third spring abuts against the inner side wall of the third accommodating cavity, and the other end abuts against the rear connecting seat.

[0011] Furthermore, an accommodating groove for accommodating the claw is provided on an edge portion of the claw fixing seat close to one end of the male plug; The claws can move in radial direction, wherein: the outer sleeve is used to limit the claws on the outside, and the valve core or male plug is used to limit the claws on the inside; The inner wall of the outer sleeve is provided with a pressing block, which is used to apply force to the claws; Furthermore, the claw is an inverted conical structure, and the opening of the corresponding receiving groove has a taper, and the outer opening of the receiving groove is larger than the inner opening.

[0012] Furthermore, the second spring is nested outside the first spring, and the first spring and the second spring are coaxially sleeved.

[0013] Furthermore, the claws are made of non-metallic material.

[0014] Furthermore, the number of the claws is not less than two; Furthermore, the number of the claws is 6.

[0015] Furthermore, the claw fixing seat and the rear connecting seat are connected through a threaded structure.

[0016] Compared with the prior art, the quick connector of the present invention has the following beneficial effects: (1) The quick connector described in the present invention mentions two implementation methods for the arrangement of components at the second sealing ring portion. One is to arrange a stopper for limiting the position at the second sealing ring portion, and the other is to arrange a protective structure with the function of limiting and protecting the second sealing ring at the second sealing ring portion. By arranging the protective structure, it is possible to prevent high-speed fluid from flushing the second sealing ring at the gas / liquid inlet and outlet portion from the correct position, thereby preventing gas / liquid leakage around the valve core that may occur when the valve core is in a completely cut-off state due to failure of the second sealing ring. In addition, the arrangement position of the second spring abutting against the protective structure in this solution is located in an idle position in the connector structure, and the size of the connector will not be increased due to the arrangement of the second spring, thereby further improving the utilization rate of the limited space in the connector. (2) The quick connector described in the present invention is configured such that the second spring is coaxially sleeved on the outside of the first spring, thereby increasing the function of protecting the O-ring by using the second spring in conjunction with the protection mechanism without increasing the size. At the same time, the center line of the guide hole is inclined relative to the center line of the valve core, thereby making full use of the internal space, increasing the flow capacity and reducing the axial size. (3) The quick connector described in the present invention has a first accommodating cavity for accommodating a first spring at the tail of the valve core, which is recessed inward and is used to accommodate the first spring. After docking, the first spring is compressed into the first accommodating cavity and does not occupy the flow channel space, so that the connector can be used in scenarios with narrow space. In addition, the setting of the retaining ring structure in this solution can maintain the integrity of the valve core or the claw fixing seat. Compared with the prior art that does not have a retaining ring structure, the valve core or the claw fixing seat is usually a split structure, and a threaded connection is required between the two, otherwise it cannot be installed, resulting in an increase in the overall size of the connector. Compared with the prior art, this solution effectively controls the size of the connector by setting the retaining ring structure; (4) The quick connector described in the present invention addresses the problem of damage to the male plug caused by the ball structure in existing connectors. This solution adopts a claw structure with a smoother contact surface to avoid damage to the male plug. In addition, according to actual use requirements, claws made of non-metallic materials can be used to further reduce damage to the male plug. (5) The quick connector described in the present invention has a connector structure that does not restrict the direction of the fluid during actual use, that is, the fluid can pass through the valve body in the forward or reverse direction. Compared with the existing technology, the versatility of this product is improved and it can be applied to more usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic cross-sectional view of the overall structure (before the male plug is inserted) according to an embodiment of the present invention; Figure 2 A schematic cross-sectional view of the overall structure (after the male plug is inserted) according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the overall structure according to an embodiment of the present invention; Figure 4 A schematic cross-sectional view of a three-dimensional structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly of the claw fixing base and the rear connecting base according to an embodiment of the present invention; Figure 6 This is a schematic structural diagram of the rear connecting seat according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a valve core at a first angle according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the valve core at a second angle according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the installation position of the stopper component before the male plug is inserted according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the installation position of the stopper component after the male plug according to an embodiment of the present invention is inserted; Figure 11 This is a schematic diagram of the assembly structure of the receiving groove and the claw according to an embodiment of the present invention; Figure 12 Schematic diagram of the first chamfer structure and the second chamfer structure according to an embodiment of the present invention; Figure 13 It is a schematic diagram of the internal local structure according to an embodiment of the present invention.

[0018] Description of reference numerals: 1. Male plug; 11. Annular flange; 2. Claw fixing seat; 21. First sealing ring; 22. Accommodating groove; 23. Third sealing ring; 3. Rear connecting seat; 31. Rear connecting seat body; 32. Joint structure; 4. Outer sleeve; 41. Pressing block; 42. Third accommodating chamber; 43. Third spring; 44. Second chamfered structure; 5. Valve core; 51. First accommodating chamber; 52. First spring; 53. Second sealing ring; 54. Sealing rubber ring; 55. Conducting hole; 6. Claw; 61. First chamfered structure; 7. Protective mechanism; 71. Second accommodating chamber; 72. Second spring; 73. Retaining ring; 8. Stopper DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] This solution discloses a quick connector. For ease of description, the following description uses Figure 1 To describe the orientation for a standard view, for example, the left end is Figure 1 The left and right ends are Figure 1 On the right, the quick connector serves as a female plug structure that cooperates with the male plug 1. The main structure includes a main structure composed of a claw fixing seat 2 and a rear connecting seat 3. The claw fixing seat 2 and the rear connecting seat 3 can be connected by a threaded structure or other structure. The rear connecting seat 3 structure includes a rear connecting seat body 31 and a joint structure 32. The joint structure can be arranged on the side or rear of the rear connecting seat body according to actual use requirements. The joint structure coincides with the center line of the rear connecting seat body or has an angle; A passage is configured in the shell. In actual use, taking tank A as an example, tank A can be configured with one or at least two connectors mentioned in this solution according to actual use requirements. Taking one as an example, one end of the connector is connected to tank A, and the other end is connected to an external pressure source (including but not limited to a gas source or a liquid source) or an external container. The external pressure source or external container is connected to tank A through a male plug 1; taking two as an example, tank A is installed with two connectors mentioned in this solution, one of which serves as an input end to tank A, and the other serves as an output end to tank A. Similarly, tank A can be configured with at least two connectors mentioned in this solution according to actual use requirements, for example, fluid can be input or output to tank A at the same time through multiple connectors; One end of the housing is configured to be connected to an external gas / liquid source, and the other end is configured to be connected to the male plug 1. The first connection end and the second connection end are connected through a passage. In actual use, either the first connection end or the second connection end of the housing can be configured to be connected to the gas / liquid source according to actual use requirements, and the other end can be configured as a container. In actual use, the same container can also be connected to two connector structures mentioned in this solution, with one connector structure serving as the inlet of the container and the other as the outlet. The passage is provided with a valve core 5 structure for controlling the conduction or interruption of the passage. The specific structure of the valve core 5 is shown in the figure. When the male plug 1 is not in contact with the valve core 5 or the sealing rubber ring 54, the second sealing ring 53 separates the inner cavities at both ends after the valve core 5 returns to its original position, preventing the fluid on the right side from flowing out. At this time, the guide hole 55 is in a completely closed state (i.e., no fluid flows through the guide hole 55) (for the convenience of subsequent description, the closure of the guide hole 55 is referred to as the completely interrupted state of the valve core 5). In this solution, a third sealing ring 23 is provided between the claw fixing seat 2 and the valve core 5; When the male plug 1 moves into the passage along the axis of the valve core 5 (defined as the X-axis direction), the male plug 1 contacts the sealing rubber ring 54 installed at the end of the valve core 5. As the male plug 1 continues to move, the thrust applied by the male plug 1 to the valve core 5 (the structure of the valve core 5 is shown in the figure, which is provided with a first accommodating cavity 51 structure, and the first spring 52 is used as the return spring of the valve core 5, one end of which is placed in the first accommodating cavity 51 and the other end abuts against the inner wall of the shell, specifically, the inner side wall of the rear connecting seat 3 as shown in the figure) will gradually compress the first spring 52. At this time, the valve core 5 moves along the X-axis direction. Movement, at this time, the conducting hole 55 on the valve core 5, which was originally blocked by the right end of the claw fixing seat 2, gradually moves horizontally toward the rear connecting seat 3. When it moves to the appropriate position, the conducting hole 55 on the valve core 5 and the rear connecting seat 3 are gradually connected. At this time, gas / liquid can be transmitted between the first end and the second end of the shell through the conducting hole 55 on the valve core 5. After the male plug 1 is inserted into the preset position, the conducting hole 55 is fully connected (for the convenience of subsequent description, the complete connection of the conducting hole 55 is referred to as the fully connected state of the valve core 5). At this time, the first spring 52 is in a compressed position close to the limit of movement; When the valve core 5 is in the fully conducted state, as the male plug 1 pushes the valve core 5, the protection mechanism 7 also moves along the X-axis direction with the valve core 5, and the second spring 72 installed between the protection mechanism 7 and the rear connecting seat 3 is also compressed. The structure of the protection mechanism 7 is shown in the figure. The left end of the protection mechanism 7 is provided with a second accommodating chamber structure for accommodating the second sealing ring 53. When the valve core 5 is in the fully cut-off state of the valve core 5, the protection mechanism 7 is in a stationary state at this time. However, as the male plug 1 applies force to the valve core 5 and the valve core 5 moves along the X-axis direction, the second spring 72 will apply a force opposite to the movement direction of the valve core 5 to the protection mechanism 7 due to the force. The protection mechanism 7 will move along the outer column surface at the tail of the valve core 5 toward the male plug 1. At this time, the second accommodating chamber of the protection mechanism 7 is gradually used to block the second sealing ring 53, thereby protecting the second sealing ring 53. As the valve core 5 is gradually squeezed by the force applied by the male plug 1 to the fully conducted state of the valve core 5, the second sealing ring 53 The whole is in the second accommodating chamber. The purpose of providing the protection mechanism 7 in this solution is to prevent the second sealing ring 53 from being damaged or dislocated due to the direct impact of gas / liquid on the second sealing ring 53 during use. At the same time, according to actual usage experience, the first spring 52 in this solution has a larger stiffness coefficient than the second spring 72. A retaining ring 73 for limiting is provided between the tail of the protection mechanism 7 and the tail of the valve core 5 in this solution. The purpose of providing the retaining ring 73 is: if the retaining ring is not used, the valve core 5 and the stopper 8 / protection mechanism 7 need to be separated into two parts, otherwise they cannot be assembled. If there is no retaining ring, the following problems will occur: 1. In order to connect the valve core 5 and the stopper 8 / protection mechanism 7, the two need to be connected by a structure such as a thread, which will cause the overall size of the connector to become thicker, which is not conducive to size control; 2. If a threaded connection or other method is not used, the two parts need to have an interference fit, which will make it impossible to disassemble the two after assembly; In addition, this solution proposes two embodiments for the protection mechanism 7. In one embodiment, Figure 9 and Figure 10 As shown, a retaining ring 73 is provided on the outside of the first accommodating chamber 51 of the valve core 5, and the stopper 8 is limited between the retaining ring 73 and the claw fixing seat 2. At this time, the function of the stopper 8 is to limit the tendency of the valve core 5 to move to the left when the male plug 1 is not inserted; in another embodiment, the stopper 8 can be replaced by a protection mechanism 7, which is limited between the retaining ring 73 and the claw fixing seat 2. A second accommodating chamber 71 for accommodating the second sealing ring 53 to be protected is formed between the first end of the protection mechanism 7 and the outside of the first accommodating chamber 51 of the valve core 5, and the second end of the protection mechanism 7 abuts against the housing through a second spring 72. The second sealing ring 53 is provided between the valve core 5 and the claw fixing seat 2. At this time, the function of the protection mechanism 7 is that when the valve is opened after the male and female heads are plugged in, the protection mechanism 7 slides to the left under the action of the spring 72, covering the O-ring 53 to prevent it from being blown out.

[0022] When the male plug 1 is fully inserted into the connector, the locking mechanism cooperates with the claw 6 to fix the male plug 1 in the connector. When the male plug 1 needs to be separated from the connector, the locking mechanism needs to be unlocked, thereby releasing the claw 6, so that the male plug 1 can be separated from the connector. The specific structure of the locking structure includes: an outer sleeve 4 arranged on the outside of the claw fixing seat 2, the outer sleeve 4 is arranged at the intersection of the claw fixing seat 2 and the rear connecting seat 3, and a third accommodating cavity 42 for accommodating a third spring 43 is provided in the outer sleeve 4. One end of the third spring 43 abuts against the inner side wall of the third accommodating cavity 42, and the other end abuts against the rear connecting seat 3. At the same time, it can be seen from the cross-sectional view in the accompanying drawings that a pressing block 41 is provided on the inner wall of the outer sleeve 4, and the pressing block 41 cooperates with the outer surface of the claw 6 to realize the pressing, limiting and releasing of the claw 6. The use process of the locking mechanism is as follows: The structure of the male plug 1 is shown in the figure. The head of the male plug 1 is provided with an outwardly protruding annular flange 11 structure. The annular flange structure includes but is not limited to being composed of two slopes as shown in the figure. The purpose of the annular flange structure is to cooperate with the claw 6, and the claw 6 is used to limit the annular flange structure, thereby realizing the limitation of the male plug 1. The specific operation is as follows: When the male plug 1 is fully inserted into the connector, the locking mechanism needs to be used to lock the male plug 1 and reset the outer sleeve 4 to the initial position (the position of the outer sleeve 4 when it is not in contact with the male plug is defined as the initial position). The outer sleeve 4 can be reset by applying force or by using The third spring 43, which has been compressed in the unlocked state, resets itself to return the outer sleeve 4 to its original position. After returning to its original position, the locking mechanism is in the locked state. At this time, the pressing block 41 presses the claw 6 from the outside inward, and the claw 6 is squeezed inward (in actual use, the positional relationship between the claw 6 and the male plug in the locked state can be: 1) close contact with the outer wall of the male plug 1 to improve the stability of the connection; 2) there is a clearance between the claw 6 and the outer wall of the male plug 1 to adapt to male plugs 1 of different sizes). When the male plug 1 needs to be disconnected from the connector, the locking mechanism needs to be unlocked and released. The operating principle is the same as above. In addition, in order to facilitate the insertion and withdrawal of the male plug 1, the claw 6 of this solution is provided with a beveled first chamfered structure 61. As shown in the figure, the function of the chamfered structure 61 can be summarized as follows: in the locked state, it serves as a force-bearing surface that contacts / abuts against the male plug 1; when the male plug 1 is withdrawn from the connector, it serves as a guide. If this part does not have a chamfered joint 61 and a right-angle structure is used, it may get stuck during the withdrawal process, which may cause the claw 6 to fail to expand automatically; similarly, a second chamfered structure 44 is provided at the clamping block 41 of the outer sleeve 4. When the outer sleeve 4 moves, due to the setting of the second chamfered structure 44, the clamping block 41 and the claw are in contact to avoid jamming between the two, thereby hindering the movement of the outer sleeve 4.

[0023] In summary, in this solution, the protection mechanism 7 is provided to protect the second sealing ring 53 at the gas / liquid inlet and outlet, thereby preventing gas / liquid leakage around the valve core 5 that may occur when the valve core 5 is in a completely cut-off state due to failure of the second sealing ring 53; in addition, the second spring 72 that triggers the protection mechanism 7 in this solution is spatially arranged on the outside of the first spring 52, thereby avoiding the problem of the overall size of the connector becoming longer due to the setting of the second spring 72, making full use of the space, and effectively controlling the size of the connector so that the connector can be applied to more usage scenarios with narrow usage spaces; in addition, in response to the problem of damage to the male plug 1 caused by the use of a ball structure to guide the entry of the male plug 1 in the existing connector, this solution adopts a claw 6 structure with a smoother contact surface to avoid damage to the male plug 1. In addition, according to actual usage requirements, a claw 6 made of non-metallic material can be used to further reduce damage to the male plug 1.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quick connector, characterized in that: The device comprises a housing, a passage and a valve structure are arranged in the housing, and two ends of the housing are respectively arranged as a first connection end and a second connection end; Connecting the first connection end or the second connection end to an external gas source, an external liquid source, or an external container; The male plug (1) is connected to the first connection end or the second connection end; The valve structure includes a valve core (5), and the valve structure is used to control the conduction / interruption of the passage between the first connection end and the second connection end; A locking mechanism is arranged at the end of the shell, and the locking mechanism is used to achieve locking / separation between the shell and the male plug (1).

2. A quick connector according to claim 1, characterized in that: The housing comprises a claw fixing seat (2) and a rear connecting seat (3), and a first sealing ring (21) is provided between the connecting portion of the claw fixing seat (2) and the rear connecting seat (3); Preferably, the rear connecting seat (3) structure comprises a rear connecting seat body (31) and a joint structure (32), wherein the joint structure (32) is arranged on the side or rear of the rear connecting seat body (31), and the joint structure (32) coincides with or has an angle with the center line of the rear connecting seat body (31); Preferably, the angle between the joint structure (32) and the rear connecting seat body (31) is 90°.

3. The quick connector according to claim 1, wherein: The outer wall of the tail portion of the valve core (5) is recessed inward to form a first accommodating cavity (51), and the first accommodating cavity (51) has an opening toward one end of the housing; The first end of the first spring (52) is arranged in the first accommodating cavity (51), and the other end extends from the opening of the first accommodating cavity (51) to abut against the inner wall of the shell.

4. A quick connector according to claim 1, characterized in that: A retaining ring (73) is provided outside the first accommodating cavity (51) of the valve core (5); The stopper (8) is limited between the retaining ring (73) and the claw fixing seat (2); The second sealing ring (53) is arranged between the valve core (5) and the claw fixing seat (2); Preferably, the stopper (8) is replaced by a protection mechanism (7), and the protection mechanism (7) is limited between the retaining ring (73) and the claw fixing seat (2); Preferably, a second accommodating cavity (71) for accommodating a second sealing ring (53) to be protected is formed between the first end of the protection mechanism (7) and the outside of the first accommodating cavity (51) of the valve core (5), and the second end of the protection mechanism (7) abuts against the housing via a second spring (72).

5. A quick connector according to claim 4, characterized in that: A sealing rubber ring (54) in contact with the male plug (1) is provided at one end of the valve core (5) away from the first accommodating chamber (51); Preferably, a conducting hole (55) is provided on the body of the valve core (5) and is arranged on the side of the second sealing ring (53) facing the sealing rubber ring (54); Preferably, the angle between the center line of the conducting hole (55) and the center line of the valve core (5) is 30°-60°.

6. The quick connector according to claim 1, characterized in that: The locking mechanism comprises an outer sleeve (4) arranged outside the claw fixing seat (2), and the outer sleeve (4) is arranged at the junction of the claw fixing seat (2) and the rear connecting seat (3); A third accommodating cavity (42) for accommodating a third spring (43) is provided in the outer sleeve (4); one end of the third spring (43) abuts against the inner side wall of the third accommodating cavity (42), and the other end abuts against the rear connecting seat (3).

7. A quick connector according to claim 6, characterized in that: An accommodating groove (22) for accommodating the claw (6) is provided at an edge portion of the claw fixing seat (2) close to one end of the male plug (1); The claw (6) is movable in the radial direction, wherein: the outer sleeve (4) is used to limit the position of the claw (6) on the outside, and the valve core (5) or the male plug (1) is used to limit the position of the claw (6) on the inside; The inner wall of the outer sleeve (4) is provided with a pressing block (41), and the pressing block (41) is used to apply force to the claw (6); Preferably, the claw (6) is an inverted conical structure, the opening of the corresponding receiving groove (22) has a taper, and the outer opening of the receiving groove (22) is larger than the inner opening.

8. A quick connector according to claim 3 or 4, characterized in that: The second spring (72) is nested outside the first spring (52), and the first spring (52) and the second spring (72) are coaxially sleeved.

9. The quick connector according to claim 7, characterized in that: The claw (6) is made of non-metallic material.

10. The quick connector according to claim 7, characterized in that: The number of the claws (6) is not less than two; Preferably, the number of the claws is 6.

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