A quick connector

Abstract

The application provides a quick connector, which comprises a connector pipe, a valve core, a first insertion pipe, a second insertion pipe and a locking mechanism, the connector pipe is provided with an integrated blocking ring, the blocking ring is provided with a first chamber and a second chamber on two sides, and the axial end faces of the blocking ring are inclined to the radial direction; the valve core is slidingly arranged in the blocking ring and is used for changing the communication state of the first chamber and the second chamber; the valve core is provided with a limiting ring, a fluid passage and a first sealing ring, the limiting ring is used for acting on the blocking ring to limit the displacement stroke of the valve core towards the second chamber; the fluid passage is used for realizing the communication of the first chamber and the second chamber; the first sealing ring is sleeved on the valve core, is located on the side of the limiting ring close to the second chamber, and has an outer diameter greater than the inner diameter of the blocking ring; the first insertion pipe and the second insertion pipe are respectively inserted into the first chamber and the second chamber; the valve core spring is arranged in the first chamber and axially acts on the first insertion pipe and the valve core; and the locking mechanism is used for locking the second insertion pipe and the connector pipe.

Description

Technical Field

[0001] This application relates to the field of pipe fitting technology, specifically to a quick-connect fitting. Background Technology

[0002] During welding, welding equipment requires the introduction of shielding gas to assist welding and cooling liquid to cool. Therefore, some welding equipment is equipped with gas supply system and water cooling system. However, both gas supply system and water cooling system require external gas supply and water supply. Quick-connect couplings are used to connect the gas supply system to the gas supply and the water cooling system to the water supply.

[0003] In existing quick-connect couplings, most are equipped with a connector tube, a valve core, and a second insert tube. One end of the connector tube is connected to a pipe joint of a water or gas supply source via a thread. The valve core is located inside the connector tube. The second insert tube is inserted into the connector tube from the other end. The other end of the second insert tube is connected to a water cooling system or a gas circuit system. The second insert tube pushes the valve core to move, thereby achieving conduction between the second insert tube, the valve core, and the connector tube, and thus enabling the transport of gas or liquid.

[0004] However, in the existing technology, the sealing structure set in the connector pipe for sealing the valve core is mostly a sealing ring made of elastic material. The valve core moves so that the valve core inlet is located on both sides of the sealing structure, thus realizing whether the connection is achieved. Since the sealing structure is made of elastic material, the sealing effect will be affected after the number of valve core movements increases. At the same time, the elastic material is easily deformed under the impact of force, causing the sealing structure to fail.

[0005] Therefore, there is room for further improvement in the existing quick-connect connectors. Utility Model Content

[0006] In view of this, and addressing the technical problem that the sealing structure of the quick-connect connector in the prior art is made of elastic material, which is prone to deformation and failure under stress, thus affecting the use of the quick-connect connector, this application provides a quick-connect connector with an integrally formed sealing ring inside the connector tube. This sealing ring is not made of elastic material, has high structural strength, is not easily deformed and failed under stress, and can ensure the use effect of the quick-connect connector.

[0007] This application provides a quick-connect connector, comprising: The connector tube is equipped with an integrally formed sealing ring; the sealing ring has a first chamber and a second chamber on both sides; The valve core is slidably disposed within the sealing ring and is used to move axially to change the communication state between the first chamber and the second chamber. A limiting ring, located on the valve core, is used to work with the sealing ring to limit the travel of the valve core toward the second chamber. A fluid passage, located on the valve core, is used to connect the first chamber and the second chamber; The first sealing ring is fitted onto the valve core and is located on the side of the limiting ring near the second chamber. Its outer diameter is larger than the inner diameter of the sealing ring. The first cannula is inserted at one end into the first chamber. The second cannula is slidably disposed in the second chamber and is used to apply a force to the valve core to displace it toward the first chamber. The valve core spring is located in the first chamber, and its two axial ends interact with the first insertion tube and the valve core, respectively. A locking mechanism is used to lock the second cannula to the connector tube; The two axial end faces of the sealing ring are inclined in the radial direction.

[0008] Compared with the prior art, the quick-connect fitting provided in this application has a first insert and a second insert at each end of the fitting tube. A water supply and a water cooling system are connected to the first and second inserts respectively, or an air supply and an air circuit system are connected to the first and second inserts respectively. Both the first and second inserts have a tapered limiting ring on their outer sides away from the fitting tube. In practical use, a quick connection can be achieved by simply fitting the corresponding fitting over the first and second inserts, reducing connection time. Furthermore, a sealing ring integrally formed with the fitting tube is provided inside the fitting tube. The fitting tube is made of metal, and the corresponding sealing ring has high structural strength, good wear resistance, is not easily worn, has a long service life, and is not subject to stress. The design is easily deformable, ensuring effective engagement with the valve core and preventing the quick-connect coupling from failing. Furthermore, the axial end faces of the sealing ring are inclined, and the end faces of the limiting ring and the second insertion tube facing the sealing ring can fit against the sealing ring's end face. This means the end faces of the valve core, the second insertion tube, and the sealing ring are also inclined. This reduces the pure axial impact force when the second insertion tube and the limiting ring collide with the sealing ring along the axial direction, reducing stress concentration at the corners of the contact surfaces. This improves the durability and wear resistance of the limiting ring and the sealing ring, extending their service life. Moreover, the reduced impact force correspondingly reduces the collision noise between the limiting ring, the second insertion tube, and the sealing ring, thus reducing noise.

[0009] Preferably, the fluid passage includes: an air inlet, at least one, arranged radially, located on the side of the first sealing ring near the second chamber, and opening on the side wall of the valve core; The vent is axially positioned and opens on the end face of the valve core facing the second chamber. The first sealing groove is located on the valve core and is used to install the first sealing ring; The axial length of the sealing ring is L1, the axial length of the air inlet is L2, and the length between the first sealing ring and the limiting ring is L3, wherein L1>L2 and L1>L3.

[0010] Preferably, the valve core includes a first valve portion and a second valve portion, which are arranged axially, and the outer diameter of the first valve portion is smaller than the outer diameter of the second valve portion; The limiting ring, air inlet, air outlet, and first sealing groove are provided on the second valve part. The outer diameter of the second valve part is less than or equal to the inner diameter of the sealing ring. The outer diameter of the limiting ring is greater than the inner diameter of the sealing ring and less than or equal to the inner diameter of the first chamber. The second valve section is used to install the valve core spring.

[0011] Preferably, the two sides of the sealing ring are a first end face and a second end face, respectively, with the first end face located in the first chamber and the second end face located in the second chamber; Both the first and second end faces are inclined to the radial plane, and the axial length between the first and second end faces gradually decreases along the radial direction close to the central axis.

[0012] Preferred options also include: The third chamber is located on the side of the second chamber away from the sealing ring, and its inner diameter is larger than that of the second chamber. The third end face is located between the second chamber and the third chamber and is inclined in the axial direction; The locking mechanism is located at least partially within the third chamber; The first insertion tube and the connector tube are fixedly connected by an interference fit.

[0013] Preferably, the locking mechanism includes: The mounting hole is located on the connector tube and penetrates the connector tube radially. Steel balls are placed inside the mounting holes; A locking groove, located on the second insertion tube, is used to accommodate some of the steel balls; Wherein, the diameter of the steel ball is D, the radial depth of the mounting hole is D1, the radial depth of the locking groove is D2, D>D1, D>D2, and (D1+D2)≥D.

[0014] Preferably, the locking mechanism further includes a sleeve and an unlocking spring, the unlocking spring being sleeved on the connector tube; The sleeve is provided with a first cylindrical part and a second cylindrical part, and the inner diameter of the first cylindrical part is larger than the inner diameter of the second cylindrical part. The first cylindrical part is sleeved on the outside of the unlocking spring, and the connector tube is provided with a limiting step. The two ends of the unlocking spring act with the limiting step and the side end of the second cylindrical part, respectively. When the unlocking spring is in its natural state, the second cylinder is located outside the mounting hole.

[0015] Preferably, the sleeve is further provided with a third cylindrical portion, which is located on the side of the second cylindrical portion away from the first cylindrical portion; The inner diameter of the third cylindrical section is larger than that of the second cylindrical section, and the radial length between the inner wall of the third cylindrical section and the outer wall of the connector pipe is D3, wherein D3 <D,(D3+D1)≥D; When the unlocking spring is in a compressed state, the third cylinder is located outside the mounting hole.

[0016] Preferably, the second cannula comprises: The first limiting surface is located at the end of the second insertion tube near the sealing ring, and is arranged parallel to the radial direction for fitting with the valve core; The second limiting surface is set around the outside of the first limiting surface and is inclined in the axial direction for fitting with the sealing ring. The third limiting surface is inclined in the axial direction and is used to fit with the third end face; The fourth limiting surface, parallel to the radial direction, is used to fit against the end face of the connector tube.

[0017] Preferably, the second cannula comprises: The outer diameter of the first tube is less than or equal to the inner diameter of the second chamber; the first limiting surface and the second limiting surface are provided on the first tube. The second tube section has a gradually increasing radial length along the axial direction away from the sealing ring; the third limiting surface is provided on the second tube section. The outer diameter of the third tube is greater than the inner diameter of the second chamber and less than or equal to the inner diameter of the third chamber; a locking groove is provided on the third tube. The fourth tube has an outer diameter larger than the inner diameter of the third chamber; a fourth limiting surface is provided on the fourth tube. A second sealing groove, at least one, is provided on the first pipe section; The second sealing ring is located inside the second sealing groove. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural schematic diagram of a quick-connect connector provided in an embodiment of this application; Figure 2 This is a partial cross-sectional structural schematic diagram of a quick-connect connector provided in an embodiment of this application; Figure 3 yes Figure 2 A magnified view of part A; Figure 4 yes Figure 2 A magnified schematic diagram of part B.

[0019] Reference numerals: 1. Connector tube; 2. Valve core; 3. Valve core spring; 4. First insertion tube; 5. Second insertion tube; 6. Locking mechanism; 7. First sealing ring; 8. Second sealing ring; 11. Sealing ring; 12. First chamber; 13. Second chamber; 14. Third chamber; 15. Mounting hole; 16. First end face; 17. Second end face; 18. Third end face; 19. Limiting step; 21. Limiting ring; 22. First sealing groove; 23. Air inlet; 24. Air outlet; 25. First valve section; 26. Second valve section; 51. Locking groove; 52. First tube section; 53. Second tube section; 54. Third tube section; 55. Fourth tube section; 521. First limiting surface; 522. Second limiting surface; 523. Second sealing groove; 531. Third limiting surface; 551. Fourth limiting surface; 61. Sleeve; 62. Steel ball; 63. Unlocking spring; 611. First cylindrical section; 612. Second cylindrical section; 613. Third cylindrical section. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0021] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0022] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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, the above terms should not be construed as limitations on this application.

[0023] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 4 illustrate.

[0024] This application provides a quick-connect fitting for connecting two pipes to facilitate fluid transfer.

[0025] Specifically, such as Figures 1 to 4As shown, the quick-connect fitting includes a connector tube 1, a valve core 2, a first insert 4, and a second insert 5. The valve core 2 is located inside the connector tube 1. The first insert 4 and the second insert 5 are respectively connected to both ends of the connector tube 1. A sealing ring 11 is provided inside the connector tube 1. The sealing ring 11 is integrally formed with the tube body of the connector tube 1. The outer side of the sealing ring 11 is connected to the inner side of the tube body of the connector tube 1. The sealing ring 11 is coaxially arranged with the tube body. The two axial sides of the sealing ring 11 are the first chamber 12 and the second chamber 13, respectively. The first insert 4 is inserted into the end of the first chamber 12. The first insert 4 and the connector tube 1 are relatively fixedly connected by interference fit, welding, or thread. One end of the second insert 5 can be inserted into the second chamber 13 of the connector tube 1. The second insert 5 is slidably connected to the second chamber 13. When the second insert 5 is inserted into the second chamber 13 and moves towards the first chamber 12, it can push the valve core 2 to move towards the first chamber 12. like Figure 1 , Figure 2 As shown, the valve core 2 is at least partially located within the sealing ring 11, and the valve core 2 is slidably connected to the sealing ring 11. The outer diameter of the valve core 2 is less than or equal to the inner diameter of the sealing ring 11. The valve core 2 is provided with a limiting ring 21, a fluid channel, and a first sealing ring 7. The first chamber 12 and the second chamber 13 are connected through the fluid channel. The limiting ring 21 is always located within the first chamber 12, and the outer diameter of the limiting ring 21 is greater than the inner diameter of the sealing ring 11. The limiting ring 21 is used to contact the sealing ring 11 to limit the displacement of the valve core 2 toward the second chamber 13, thereby limiting the displacement stroke of the valve core 2 and preventing the valve core 2 from coming out of the first chamber 12. The fluid channel includes an air inlet 23 and an air outlet 24. The air inlet 23 and the air outlet 24 are connected. The air inlet 23 opens on the radially outer side wall of the valve core 2, and the air outlet 24 opens on the axial end face of the valve core 2 near the second chamber 13. Figure 3 As shown, the air inlet 23 is located on the side of the limiting ring 21 near the second chamber 13, and there is an axial distance between the opening of the air inlet 23 and the limiting ring 21; the first sealing ring 7 is sleeved on the valve core 2 and is located between the limiting ring 21 and the air inlet 23. The outer diameter of the first sealing ring 7 is larger than the inner diameter of the sealing ring 11 and smaller than the outer diameter of the limiting ring 21. The first sealing ring 7 is used to achieve the seal between the valve core 2 and the sealing ring 11. like Figure 1 , Figure 2As shown, a valve core spring 3 is provided in the first chamber 12. The two ends of the valve core spring 3 are respectively attached to the first insertion tube 4 and the valve core 2. In its natural state, when the valve core spring 3 is installed in the first chamber 12, it can apply a force parallel to the axial direction to the valve core 2 and the first insertion tube 4, causing the valve core 2 to tend to displace towards the second chamber 13. This allows the limiting ring 21 to attach to the sealing ring 11, ensuring that the air inlet of the fluid channel is located within the sealing ring 11 or within the second chamber 13, and the outlet... The vent 24 is located within the second chamber 13, simultaneously placing the first sealing ring 7 within the sealing ring 11 to achieve a seal between the valve core 2 and the sealing ring 11. This prevents the first chamber 12 from communicating with the second chamber 13, and the quick-connect fitting is not conductive at this time. When the second insertion tube 5 is inserted into the second chamber 13 and moves towards the first chamber 12, the first insertion tube 4 pushes the valve core 2 towards the first chamber 12, causing the limiting ring 21 to disengage from the sealing ring 11. Simultaneously, the end of the first insertion tube 4 contacts both the valve core 2 and the sealing ring 11. The end face of ring 11 fits to stabilize the position of valve core 2. At this time, the first sealing ring 7 and the air inlet 23 are located in the first chamber 12. The first chamber 12 and the second chamber 13 can be connected through the fluid channel and the quick-connect connector. The fluid in the first insertion tube 4 enters the second insertion tube 5 through the first chamber 12 and the fluid channel, and then enters the corresponding system through the second insertion tube 5. Therefore, in actual use, it is only necessary to connect the pipes of the two devices to the ends of the first insertion tube 4 and the second insertion tube 5 away from the connector pipe 1, and then insert the second insertion tube 5 into the second chamber 13 to realize fluid transportation. When fluid transportation is not needed, it is only necessary to pull the second insertion tube 5 out of the second chamber 13. Under the action of valve core spring 3, valve core 2 can automatically cut off the connection between the first chamber 12 and the second chamber 13, so that the fluid will not overflow from the first chamber 12. When fluid transportation is needed next time, it is only necessary to insert the second insertion tube 5. Therefore, the quick-connect connector makes fluid transportation fast, convenient and easy to use.

[0026] It should be noted that, in this application, if Figure 1 , Figure 2 As shown, the first insertion tube 4 and the second insertion tube 5 are provided with channels, which are arranged axially and the inner diameter of the channels is the same as the inner diameter of the air outlet 24. The outer side of the end of the first insertion tube 4 and the second insertion tube 5 away from the connector tube 1 is provided with a tapered limiting protrusion ring. In actual use, the corresponding fittings can be put on the outside of the first insertion tube 4 and the second insertion tube 5 to achieve quick connection and reduce connection time.

[0027] Among them, such as Figure 2 , Figure 3 As shown, the end faces at both axial ends of the sealing ring 11 are set as inclined surfaces. Correspondingly, the end faces of the limiting ring 21, the second insertion tube 5, and the sealing ring 11 are all inclined surfaces, and the inclination angle is the same as the inclination angle of the end face of the sealing ring 11; specifically, as shown... Figure 3As shown, the sealing ring 11 has a first end face 16 and a second end face 17 on its two sides. The first end face 16 is located in the first chamber 12, and the second end face 17 is located in the second chamber 13. Both the first end face 16 and the second end face 17 are inclined to the radial plane. Along the radial direction toward the central axis, the axial length between the first end face 16 and the second end face 17 gradually decreases, thus making the sealing ring 11 wider at the outside and narrower at the inside. On the one hand, this increases the connection width between the sealing ring 11 and the pipe body of the connector pipe 1, which can increase the structural connection strength of the sealing ring 11. On the other hand, it makes the inner ring length of the sealing ring 11 smaller, which can reduce... While reducing the volume of the connector tube 1, the length of the valve core 2 is also reduced, further decreasing the overall volume of the quick-connect connector. Furthermore, since the contact surfaces of the limiting ring 21, the second insertion tube 5, and the sealing ring 11 are inclined, the impact force is reduced when the second insertion tube 5 and the limiting ring 21 collide with the sealing ring 11 along the axial direction. This reduces stress concentration at the corners of the contact surfaces, thereby improving the durability and wear resistance of the limiting ring 21 and the sealing ring 11, and extending their service life. Moreover, as the impact force decreases, the collision sound of the limiting ring 21, the second insertion tube 5, and the sealing ring 11 is correspondingly reduced, resulting in noise reduction.

[0028] In this application, the connector tube 1 is made of metal material, and the corresponding sealing ring 11 has high structural strength, good wear resistance, is not easy to wear, has a long service life, and is not easily deformed under stress, which can ensure the effectiveness of the cooperation with the valve core 2, making the quick-connect connector less prone to failure in switching on and off.

[0029] Furthermore, in this application, as Figure 1 , Figure 2 As shown, the quick-connect fitting is also equipped with a locking mechanism 6. The locking mechanism 6 is used to lock the second insertion tube 5 relative to the connector tube 1, keeping the position of the second insertion tube 5 relatively fixed, so that the second insertion tube 5 can stably apply force to the valve core 2, ensuring the conduction stability of the quick-connect fitting, and ensuring the stable delivery of fluid.

[0030] Furthermore, such as Figure 2 As shown, the vent 24 is axially arranged and coaxially arranged with the valve core 2. The length of the vent 24 is less than the length of the valve core 2. The outer side of the vent 24 opens on the axial sidewall of the valve core 2 near the second chamber 13. The vent 24 does not penetrate the valve core 2 axially. There is at least one inlet 23, which is radially arranged. The outer end of the inlet 23 opens on the radial sidewall of the valve core 2. The inlet 23 can penetrate the valve core 2, in which case both ends of the inlet 23 open on the radially opposite sidewalls of the valve core 2. The middle part of the inlet 23 communicates with the inner end of the vent 24. Alternatively, the inlet 23 may not penetrate the valve core 2, and the inner end of the inlet 23 communicates with the inner end of the vent 24. In this embodiment, the inlet 23 preferably penetrates the valve core 2. The number of inlet 23 can be selected according to actual needs and is not limited here.

[0031] like Figure 2 , Figure 3 As shown, a first sealing groove 22 is provided between the limiting ring 21 and the air inlet 23. The first sealing groove 22 is an annular groove and is used to install the first sealing ring 7. The axial length of the inner wall of the sealing ring 11 is L1, the axial length of the air inlet 23 is L2, and the length between the first sealing ring 7 and the limiting ring 21 is L3, where L1>L2 and L3. This ensures that the sealing ring 11 can completely block the air inlet 23, thus ensuring the sealing effectiveness of the quick-connect fitting. At the same time, it also ensures that when the limiting ring 21 and the sealing ring 11 abut, the sealing ring can act between the sealing ring 11 and the valve core 2, thus ensuring the effectiveness of the sealing ring and preventing fluid leakage from the gap between the valve core 2 and the sealing ring 11.

[0032] like Figure 1 , Figure 2 As shown, the valve core 2 includes a first valve portion 25 and a second valve portion 26, which are arranged axially. The first valve portion 25 is located near the first chamber 12, and the second valve portion 26 is located near the second chamber 13. The outer diameter of the first valve portion 25 is smaller than the outer diameter of the second valve portion 26. A limiting ring 21, an air inlet 23, an air outlet 24, and a first sealing groove 22 are provided on the second valve portion 26. The outer diameter of the second valve portion 26 is smaller than or equal to the inner diameter of the sealing ring 11, and the limiting ring 21 is smaller than or equal to the inner diameter of the first chamber 12, so that the limiting ring 21 can be displaced within the first chamber 12. The end of the limiting ring 21 away from the second chamber 13 is flush with the end of the second valve portion 26. The second valve portion 26 is used to install the valve core spring 3, such as... Figure 2 As shown, the valve core spring 3 is sleeved on the first valve part 25, and the end of the valve core spring 3 acts on the second valve part 26 and the limiting ring 21. That is, the second valve part 26 and the limiting ring 21 can provide axial support for the valve core spring 3 to ensure the stability of the valve core spring 3's action on the valve core 2.

[0033] In this embodiment, the valve core spring 3 can be any one of a columnar spring, a conical spring, or a spring sheet.

[0034] Based on any of the above embodiments, the connector tube 1 will be further described; such as Figures 1 to 2 As shown, the connector tube 1 also includes a third chamber 14, which is located on the side of the second chamber 13 away from the sealing ring 11. The inner diameter of the third chamber 14 is larger than the inner diameter of the second chamber 13. A third end face 18 is provided between the second chamber 13 and the third chamber 14. The third end face 18 is inclined in the axial direction and the angle between the third end face 18 and the axis is an acute angle.

[0035] Correspondingly, the second cannula 5 includes a first tube section 52, a second tube section 53, a third tube section 54, and a fourth tube section 55 arranged sequentially along an axial direction away from the first chamber 12. The first tube section 52 acts within the second chamber 13, and the third tube section 54 acts within the third chamber 14. The outer diameter of the first tube section 52 is smaller than that of the third tube section 54. The second tube section 53 is located between the first tube section 52 and the third tube section 54. The radial outer diameter of the second tube section 53 gradually increases toward the third tube section 54. The outer diameter of the fourth tube section 55 is larger than that of the third chamber 14. The first tube 52 has a first limiting surface 521 and a second limiting surface 522 at its end near the first chamber 12. The first limiting surface 521 is parallel to the radial direction and is used to fit with the valve core 2. The second limiting surface 522 is arranged around the outer periphery of the first limiting surface 521 and is inclined in the axial direction, used to fit with the second end face 17 of the sealing ring 11. The outer side of the second tube 53 is a third limiting surface 531. The third limiting surface 531 has the same inclination angle as the third end face 18, so as to play a guiding, shock absorption and buffering role. The end face of the fourth tube 55 near the third tube 54 forms a fourth limiting surface 551. The fourth limiting surface 551 is parallel to the radial direction and is used to fit with the end face of the connector tube 1 to realize the axial limiting of the second insertion tube 5.

[0036] In this embodiment, as Figure 1 Figure 2 As shown, the first tube 52 is provided with at least one second sealing groove 523. The second sealing groove 523 is used to install the second sealing ring 8. The outer diameter of the second sealing ring 8 is larger than the inner diameter of the second chamber 13 and smaller than the inner diameter of the third chamber 14. Through the second sealing ring 8, the gap between the second insertion tube 5 and the connector tube 1 can be sealed to prevent fluid from leaking from the gap between the outside of the second insertion tube 5 and the inner wall of the connector tube 1.

[0037] Preferably, in this application, there are two second sealing grooves 523, which are spaced apart.

[0038] Based on any of the above embodiments, the locking mechanism 6 is further described; the locking mechanism 6 includes a steel ball 62, a sleeve 61, and an unlocking spring 63, as follows: Figure 2 , Figure 4As shown, the joint pipe 1 is provided with a mounting hole 15, the mounting hole 15 is located at the position of the joint pipe 1 where the third chamber 14 is located, the mounting hole 15 penetrates the joint pipe 1 in a radial direction, the steel ball 62 is arranged in the mounting hole 15, the diameter of the steel ball 62 is D, the radial depth of the mounting hole 15 is D1, and D>D1, so that in a natural state of the steel ball 62, at least part of the steel ball 62 is located in the third chamber 14; correspondingly, the third pipe portion 54 of the second insertion pipe 5 is provided with a locking groove 51, the locking groove 51 is of an arc-shaped groove structure, the locking groove 51 is used for accommodating part of the steel ball 62, the radial depth of the locking groove 51 is D2, D>D2, and (D1+D2)≥D, so that the steel ball 62 can be positioned in the mounting hole 15 and the locking groove 51 at the same time, to axially limit the position of the second insertion pipe 5 and the joint pipe 1, so that the second insertion pipe 5 has a stable position in the axial direction and is not easy to shake, ensuring the stability of the action on the valve core 2, so that the quick-plug joint can maintain communication.

[0039] As Figure 2 shown, the unlocking spring 63 is sleeved on the joint pipe 1; the sleeve 61 is provided with a first cylinder portion 611, a second cylinder portion 612 and a third cylinder portion 613, the first cylinder portion 611, the second cylinder portion 612 and the third cylinder portion 613 are sequentially arranged along an axial direction away from the first chamber 12, the inner diameter of the first cylinder portion 611 is larger than the inner diameter of the second cylinder portion 612, and the first cylinder portion 611 is sleeved outside the unlocking spring 63; a limiting step 19 is provided outside the joint pipe 1, the unlocking spring 63 is fixedly connected with the limiting step 19, two ends of the unlocking spring 63 respectively act on the limiting step 19 and the side end of the second cylinder portion 612, to generate an axial acting force on the sleeve 61, so that the sleeve 61 has a tendency to displace in a direction away from the first chamber 12; in this embodiment, when the unlocking spring 63 is in a natural state, the second cylinder portion 612 is located outside the mounting hole 15, and the inner diameter of the second cylinder portion 612 is slightly larger than or equal to the outer diameter of the joint pipe 1, so as to generate a radial limiting effect on the steel ball 62, so that the steel ball 62 can be limited in the mounting hole 15.

[0040] Wherein, the inner diameter of the third cylinder portion 613 is larger than that of the second cylinder portion 612, the radial distance between the inner side wall of the third cylinder portion 613 and the outer side wall of the joint pipe 1 is D3, wherein D3<D and (D3+D1)≥D, so that when the third cylinder portion 613 is located outside the mounting hole 15, the steel ball 62 can protrude out of the mounting hole 15, withdraw from the locking groove 51 at the same time, and still remains at least partially in the mounting hole 15, so that the locking mechanism 6 unlocks the second insertion pipe 5 and the joint pipe 1, allowing the second insertion pipe 5 to be pulled out from the joint pipe 1. Wherein, when the unlocking spring 63 is in a compressed state, the third cylinder portion 613 is located outside the mounting hole 15.

[0041] In addition, as Figure 1 , Figure 2 , Figure 4As shown, the connector tube 1 is provided with a third sealing groove. The third sealing groove is located on the side of the mounting hole 15 away from the first chamber 12. The third sealing groove is located at the third cylindrical part 613. The third sealing groove is used to install the third sealing ring. The outer diameter of the third sealing ring is larger than the inner diameter of the second cylindrical part 612 and smaller than the inner diameter of the third cylindrical part 613. The third sealing ring is used to achieve a seal between the sleeve 61 and the connector tube 1 to prevent external impurities from entering the mounting hole 15 and clogging the steel ball 62.

[0042] In actual use, under the action of the unlocking spring 63, the steel ball 62 is at least partially located in the third chamber 14; the second insertion tube 5 is inserted into the connector tube 1, and the operator pinches the sleeve 61, applying a force to the sleeve 61 to displace it in the direction of the first insertion tube 4. The steel ball 62 exits from the third chamber 14 and is at least partially located between the third cylinder 613 and the connector tube 1; then the second insertion tube 5 is inserted to the bottom, the force on the sleeve 61 is released, and the steel ball 62 bounces back radially inward and falls into the locking groove 51, thereby achieving the locking of the second insertion tube 5 and the connector tube 1.

[0043] When it is necessary to remove the second insertion tube 5 from the connector tube 1, repeat the above steps for acting on the sleeve 61, and simply remove the second insertion tube 5 from the connector tube 1.

[0044] It should be noted that the various embodiments of this application can be arbitrarily combined to form new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0045] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A quick-connect connector, characterized in that, include: The connector tube (1) is provided with an integrally formed sealing ring (11); the sealing ring (11) is provided with a first chamber (12) and a second chamber (13) on both sides. The valve core (2) is slidably disposed in the sealing ring (11) and is used to move along the axial direction to change the communication state between the first chamber (12) and the second chamber (13); A limiting ring (21) is provided on the valve core (2) and is used to work with the sealing ring (11) to limit the travel of the valve core (2) toward the second chamber (13); A fluid passage is provided on the valve core (2) to enable communication between the first chamber (12) and the second chamber (13); The first sealing ring (7) is fitted on the valve core (2) and is located on the side of the limiting ring (21) near the second chamber (13). Its outer diameter is larger than the inner diameter of the sealing ring (11). The first cannula (4) is located at one end in the first chamber (12); The second cannula (5) is slidably disposed in the second chamber (13) and is used to apply a force to the valve core (2) to displace it toward the first chamber (12); The valve core spring (3) is located in the first chamber (12), and its two ends in the axial direction interact with the first insertion tube (4) and the valve core (2) respectively. A locking mechanism (6) is used to lock the second cannula (5) to the connector tube (1); Among them, the two axial end faces of the sealing ring (11) are inclined in the radial direction.

2. The quick-connect coupling according to claim 1, characterized in that, The fluid channel includes: An air inlet (23), at least one, is arranged radially and located on the side of the first sealing ring (7) near the second chamber (13), with an opening on the side wall of the valve core (2); An air outlet (24) is provided axially and opens on the end face of the valve core (2) facing the second chamber (13); The first sealing groove (22) is provided on the valve core (2) and is used to install the first sealing ring (7). The axial length of the sealing ring (11) is L1, the axial length of the air inlet (23) is L2, and the length between the first sealing ring (7) and the limiting ring (21) is L3, wherein L1>L2 and L1>L3.

3. The quick-connect connector according to claim 2, characterized in that, The valve core (2) includes a first valve part (25) and a second valve part (26), the first valve part (25) and the second valve part (26) are arranged axially, and the outer diameter of the first valve part (25) is smaller than the outer diameter of the second valve part (26); The limiting ring (21), air inlet (23), air outlet (24), and first sealing groove (22) are provided on the second valve part (26), the outer diameter of the second valve part (26) is less than or equal to the inner diameter of the sealing ring (11); the outer diameter of the limiting ring (21) is greater than the inner diameter of the sealing ring (11), and less than or equal to the inner diameter of the first chamber (12); The second valve section (26) is used to install the valve core spring (3).

4. The quick-connect coupling according to claim 3, characterized in that, The sealing ring (11) has a first end face (16) and a second end face (17) on both sides. The first end face (16) is located in the first chamber (12), and the second end face (17) is located in the second chamber (13). Both the first end face (16) and the second end face (17) are inclined to the radial plane. Along the radial direction close to the central axis, the axial length between the first end face (16) and the second end face (17) gradually decreases.

5. The quick-connect connector according to claim 3, characterized in that, Also includes: The third chamber (14) is located on the side of the second chamber (13) away from the sealing ring (11), and its inner diameter is larger than that of the second chamber (13). The third end face (18) is located between the second chamber (13) and the third chamber (14) and is inclined in the axial direction; The locking mechanism (6) is at least partially located within the third chamber (14); The first insertion tube (4) and the connector tube (1) are fixedly connected by an interference fit.

6. The quick-connect coupling according to claim 1, characterized in that, The locking mechanism (6) includes: Mounting hole (15) is provided on connector tube (1) and penetrates connector tube (1) radially. A steel ball (62) is placed inside the mounting hole (15); A locking groove (51) is provided on the second insertion tube (5) to accommodate part of the steel ball (62). Wherein, the diameter of the steel ball (62) is D, the radial depth of the mounting hole (15) is D1, the radial depth of the locking groove (51) is D2, D>D1, D>D2, (D1+D2)≥D.

7. The quick-connect coupling according to claim 6, characterized in that, The locking mechanism (6) further includes a sleeve (61) and an unlocking spring (63), the unlocking spring (63) being sleeved on the connector tube (1); The sleeve (61) is provided with a first cylindrical part (611) and a second cylindrical part (612), the inner diameter of the first cylindrical part (611) is larger than the inner diameter of the second cylindrical part (612); The first cylindrical part (611) is sleeved on the outside of the unlocking spring (63), and the connector tube (1) is provided with a limiting step (19). The two ends of the unlocking spring (63) interact with the limiting step (19) and the side end of the second cylindrical part (612), respectively. When the unlocking spring (63) is in its natural state, the second cylinder (612) is located outside the mounting hole (15).

8. The quick-connect coupling according to claim 7, characterized in that, The sleeve (61) is further provided with a third cylindrical part (613), which is located on the side of the second cylindrical part (612) away from the first cylindrical part (611); The inner diameter of the third cylindrical section (613) is larger than that of the second cylindrical section (612), and the radial length between the inner wall of the third cylindrical section (613) and the outer wall of the connector pipe (1) is D3, wherein D3 <D,(D3+D1)≥D; When the unlocking spring (63) is in a compressed state, the third cylinder (613) is located outside the mounting hole (15).

9. The quick-connect coupling according to claim 8, characterized in that, The second cannula (5) includes: The first limiting surface (521) is located at the end of the second insertion tube (5) near the sealing ring (11), and is arranged parallel to the radial direction for fitting with the valve core (2); The second limiting surface (522) is arranged around the outside of the first limiting surface (521) and is inclined in the axial direction for fitting with the sealing ring (11); The third limiting surface (531) is inclined in the axial direction and is used to fit with the third end surface (18); The fourth limiting surface (551) is parallel to the radial direction and is used to fit with the end face of the connector tube (1).

10. The quick-connect coupling according to claim 9, characterized in that, The second cannula (5) includes: The outer diameter of the first tube (52) is less than or equal to the inner diameter of the second chamber (13); the first limiting surface (521) and the second limiting surface (522) are provided on the first tube (52); The second tube (53) has a gradually increasing radial length in the axial direction away from the sealing ring (11); a third limiting surface (531) is provided on the second tube (53); The outer diameter of the third tube (54) is greater than the inner diameter of the second chamber (13) and less than or equal to the inner diameter of the third chamber (14); a locking groove (51) is provided on the third tube (54); The fourth tube (55) has an outer diameter larger than the inner diameter of the third chamber (14); the fourth limiting surface (551) is provided on the fourth tube (55); At least one second sealing groove (523) is provided on the first pipe section (52); The second sealing ring (8) is located in the second sealing groove (523).

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