Quick connector

Abstract

The utility model provides a quick connector, and belongs to the technical field of pipe connectors. The quick connector solves the problem that an existing quick connector is not high in use convenience and connection reliability. The quick connector comprises a tubular main body and a connecting cap connected to the end of the main body, the inner wall of the connecting cap is provided with a step face facing the end face of the main body, a conical sheet-shaped clamping ring is further arranged in the connecting cap, a piston is arranged in an inner hole in the end of the main body, and the clamping ring is located between the step face of the connecting cap and the outer end face of the piston. The small end of the clamping ring faces the piston, the inner end of the piston is provided with a stress face facing the inner end of an inner hole of the body, the piston is cylindrical, the inner hole of the piston is opposite to a center hole of the clamping ring, and an annular sealing piece is arranged between the circumferential outer side of the piston and the circumferential inner side of the body. The quick connector has high use convenience and connection reliability.

Description

Technical Field

[0001] This utility model belongs to the field of pipe fitting technology and relates to a quick connector. Background Technology

[0002] Pipe fittings are connecting tools between pipes, playing an indispensable role in pipe fittings. They are one of the two main components of hydraulic pipelines. There are many types of pipe fittings, and commonly used pipe fittings can generally be divided into rigid pipe fittings and flexible pipe fittings. If classified according to the connection method between the pipe fitting and the pipeline, rigid pipe fittings have three types: flared type, compression type, and welded type.

[0003] As disclosed in patent document (application number: 202122455819.5), a quick-connect water pipe joint for indoor water supply and drainage pipeline laying features multiple elastic arms protruding obliquely along the circumferential direction on the inner circumferential wall of a metal retaining ring. These elastic arms together form a conical structure. By inserting the three water pipes to be connected into the insertion slot through the through hole of the nut, the elastic arms abut against and secure the outer circumferential wall of the water pipes. Tightening the nut quickly connects and fixes the three water pipes. In use, the end of the water pipe is first inserted into the nut and passes through the metal retaining ring. Then, the nut is rotated, and the nut presses against the metal retaining ring. Because the metal retaining ring is conical, the elastic arms tend to fold radially inward under axial pressure, causing the elastic arms on the metal retaining ring to engage with the outer wall of the water pipe. Therefore, this quick-connect joint still requires manual rotation of the nut, which is inconvenient. Furthermore, different operators may tighten the nut to varying degrees, resulting in different clamping forces of the metal retaining ring on the water pipe. Furthermore, once the nut is tightened, the clamping force of the metal retainer on the water pipe remains unchanged. However, when water flows through the pipe, a significant water pressure is generated. If the water pressure is too high, the water pipe may easily come loose due to insufficient clamping force of the metal retainer. Therefore, this quick coupling still suffers from inconvenient operation and low connection reliability. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a quick connector that offers high ease of use and reliable connection.

[0005] The objective of this utility model can be achieved through the following technical solution: A quick connector includes a tubular body and a connecting cap connected to the end of the body. The inner wall of the connecting cap has a stepped surface facing the end face of the body. A tapered retaining ring is also provided inside the connecting cap. The key feature is that an axially sliding piston is provided in the inner hole of the end of the body. The retaining ring is located between the stepped surface of the connecting cap and the outer end face of the piston, and the smaller end of the retaining ring faces the piston. The inner end of the piston has a force-bearing surface facing the inner end of the inner hole of the body. The piston is cylindrical, and the inner hole of the piston is opposite to the center hole of the retaining ring. An annular sealing element is provided between the circumferential outer side of the piston and the circumferential inner side of the body.

[0006] The retaining ring is located inside the connecting cap, and the piston is located inside the main body, so that the connecting cap, retaining ring, piston and the end of the main body are coaxially arranged. The retaining ring is a conical plate, so it can deform radially inward when subjected to axial pressure. The piston is cylindrical. The retaining ring is axially limited between the stepped surface of the connecting cap and the end face of the piston. The piston can slide axially relative to the main body, but after assembly and tightening of the connecting cap, the piston will be axially limited by the retaining ring. This pipe fitting can be applied to various fields, such as water pipes and refrigeration copper pipes. Taking copper pipes as an example, during use, the ends of the copper pipes to be connected are inserted through the connecting cap, then through the retaining ring and into the piston. At this time, a seal is formed between the inner circumferential surface of the piston and the outer circumferential surface of the copper pipe. This seal can be formed by setting a sealing component between the outer wall of the copper pipe and the inner wall of the piston. A seal is also formed between the outer circumferential surface of the piston and the inner circumferential surface of the main body. The inner end of the piston has a force-bearing surface facing the inner end of the main body's inner hole. Therefore, when a medium is introduced into the copper pipe, the pressure of the medium inside the copper pipe will act on the force-bearing surface of the piston and push the piston outward. Under the action of the medium pressure, the outer end face of the piston will axially press against the retaining ring. Because the larger end of the retaining ring is restricted by the stepped surface, the smaller end of the retaining ring will radially contract and deform inward under axial pressure, thus clamping onto the copper pipe and realizing the connection between the copper pipe and the main body. During operation, it is only necessary to insert the copper pipe and release the medium. The retaining ring uses the pressure of the medium inside the copper pipe to clamp the copper pipe, without the need for manual force to rotate the connecting cap, making the operation more convenient. Unlike existing retaining rings that rely on tightening a nut to create a fixed clamping force, which carries the risk of pipe dislodgement when the pressure of the medium exceeds this clamping force, the piston in this application utilizes the medium pressure within the copper pipe to clamp the retaining ring. Therefore, as the medium pressure inside the copper pipe increases, the pressure exerted by the medium on the piston's force-bearing surface also increases. The piston further tightens the retaining ring, causing the clamping force of the retaining ring on the copper pipe to increase synchronously. In other words, the clamping force of the retaining ring on the copper pipe increases with the increase of the internal medium pressure, thus ensuring connection reliability during use while being applicable to different medium pressure environments.

[0007] In the aforementioned quick connector, the inner bore of the main body is a stepped bore with a larger diameter at the port than at the inner end. The stepped surface of the main body's inner bore is the abutment surface facing the port. The piston is positioned at the larger diameter position, and there is a clearance gap between the piston's force-bearing surface and the abutment surface, communicating with the inner end of the main body's inner bore. The stepped bore of the main body, with the larger diameter end accommodating the piston, ensures that the inner diameter of the piston is approximately the same as the inner diameter of the main body's inner bore. This avoids flow restriction due to an excessively small inner diameter of the piston and also allows the piston to have a larger outer diameter, resulting in a larger force-bearing surface. The medium can enter the clearance gap and act on the force-bearing surface, thereby generating a larger thrust on the piston and increasing the clamping force of the retaining ring on the copper tube. The outer end face of the piston and the stepped surface of the connecting cap form a space for accommodating the retaining ring.

[0008] In the aforementioned quick connector, the inner end face of the piston is the aforementioned force-bearing surface. A protruding abutment portion is present on the force-bearing surface of the piston, which abuts against the abutment surface of the inner bore of the main body. The force-bearing surface and the abutment surface are opposite each other. To create a sufficient clearance and ensure a large force-bearing surface area, the abutment portion is annular and located at the outer edge of the piston's force-bearing surface. When the abutment portion abuts against the abutment surface, the clearance formed between its radially inner force-bearing surface and the abutment surface communicates with the inner end of the inner bore of the main body. The medium can enter this clearance and act on the piston's force-bearing surface, thereby generating a sufficient and uniform thrust on the piston, ensuring that the piston is stably pressed against the retaining ring, and thus ensuring the stability and reliability of the retaining ring's clamping of the copper tube.

[0009] In the aforementioned quick coupling, the inner edge of the abutment surface of the main body bore has a relief cone surface circumferentially. The larger end of this relief cone surface faces the force-bearing surface of the piston, and the diameter of the larger end of the relief cone surface is larger than the diameter of the inner edge of the force-bearing surface. This relief cone surface reduces the area of ​​the abutment surface, thereby reducing the obstruction of the abutment surface to the force-bearing surface. At the same time, the relief cone surface also guides the medium. Unlike the medium entering the relief gap radially and acting on the force-bearing surface of the piston, the relief cone surface allows the medium in the main body bore to directly impact the force-bearing surface of the piston along the relief cone surface. This fully utilizes the kinetic energy of the medium's flow to make the piston press against the retaining ring, improving the stability and reliability of the retaining ring when it is tightened.

[0010] In the aforementioned quick connector, the inner circumferential surface of the main body's inner hole has a circumferentially annular limiting flange. During use, the copper tube end is inserted through the connector cap until it abuts against the limiting flange, indicating it is fully inserted. There is no need to consciously control the insertion length of the copper tube, making it quite convenient to use.

[0011] In the aforementioned quick coupling, the sealing element includes an outer sealing ring. An annular outer sealing groove is circumferentially formed on the outer circumferential surface of the piston. The outer sealing ring is fitted inside the outer sealing groove and pressed against the inner wall of the main body. The sealing ring seals the space between the piston's circumferential outer side and the inner wall of the main body, thereby ensuring that the pressure of the medium inside the copper tube is fully applied to the piston, generating sufficient top pressure on the retaining ring and guaranteeing reliable connection.

[0012] In the aforementioned quick coupling, the edges of both ends of the retaining ring are provided with several elongated deformation notches, and these notches are spaced circumferentially. The inner diameter of the smaller end of the retaining ring is slightly smaller than the inner diameter of the piston. The retaining ring is a sheet-like metal ring with circumferential deformation notches, allowing it to contract under axial pressure. Since the smaller end of the retaining ring faces the piston, even if the copper tube has a large outer diameter, the retaining ring can be radially pushed open during insertion, making it highly versatile. When pressed by the piston, the smaller end can also fully deform radially inward and clamp onto the outer wall of the copper tube, creating a reverse-clamping effect and improving connection reliability.

[0013] In the aforementioned quick coupling, the piston has a guide cone surface circumferentially along the edge of its orifice facing the retaining ring. When the piston moves outward, the guide cone surface abuts against the outer circumferential surface of the retaining ring. When a medium is introduced into the copper tube, the piston moves outward under the pressure of the medium, causing the guide cone surface to abut against the conical outer circumferential surface of the retaining ring. This provides a more stable contact and prevents damage to the retaining ring due to stress concentration at the edges, thus avoiding localized deformation of the retaining ring. Simultaneously, the guide cone surface also guides the radial contraction of the retaining ring, making its radial contraction deformation smoother. After the copper tube is secured, the piston is pressed firmly against the retaining ring by the guide cone surface, resulting in higher stability.

[0014] In the aforementioned quick connector, the connecting cap is fitted onto the end of the main body and is threadedly connected to the main body. The inner circumferential surface of the outer end of the connecting cap has a circumferentially annular limiting portion. The stepped surface is the end face of the limiting portion facing the main body. The stepped surface also has a circumferentially annular shoulder, which surrounds the larger end of the retaining ring. The threaded connection between the connecting cap and the main body facilitates the assembly of the pipe fitting. During use, after the copper pipe is inserted, the connecting cap can be pre-rotated so that the stepped surface of the connecting cap presses against the retaining ring, which pre-positions the copper pipe, allowing the medium to flow through, making the use more reliable.

[0015] In the aforementioned quick connector, a support sleeve is also provided within the main body. The inner end of the support sleeve has a disc-shaped portion circumferentially on its outer wall. The piston is sleeved on the support sleeve, and the inner end face of the piston abuts against the side of the disc-shaped portion. An insertion gap is formed between the inner circumferential surface of the piston and the outer circumferential surface of the support sleeve. The outer end of the support sleeve is inserted into the smaller end of the retaining ring. When the copper pipe to be connected is weak, the retaining ring clamping onto the outer wall of the copper pipe will cause the copper pipe to deform or break. Therefore, a support sleeve is provided within the main body, and the copper pipe is inserted into the insertion gap, that is, the end of the copper pipe is sleeved on the support sleeve. The support sleeve can support the copper pipe. At the same time, the outer end of the support sleeve is inserted into the smaller end of the retaining ring. Therefore, when the smaller end of the retaining ring is clamped onto the outer wall of the copper pipe, the inner support sleeve can directly provide support, ensuring the structural stability of the copper pipe. The disc-shaped portion on the support sleeve is used for media pushing, so that the support sleeve and the piston move outward together and press against the retaining ring.

[0016] In the aforementioned quick connector, a disassembly sleeve is inserted into the inner hole of the outer end of the connecting cap. The outer diameter of the disassembly sleeve is larger than the inner diameter of the smaller end of the retaining ring, and the inner end of the disassembly sleeve is opposite to the inner surface of the retaining ring. When the pipe connector needs to be disassembled, the disassembly sleeve is pressed inward. The inner end of the disassembly sleeve can press against the inner surface of the smaller end of the retaining ring, thereby causing the retaining ring to expand radially and release the copper pipe. In other words, the disassembly sleeve makes the pipe connector detachable and convenient.

[0017] Compared with existing technologies, this quick coupling has the following advantages:

[0018] 1. Since the operation only requires inserting the copper tube and releasing the medium, the retaining ring uses the pressure of the medium inside the copper tube to clamp the copper tube, eliminating the need to manually apply force to rotate the connecting cap, making the operation more convenient.

[0019] 2. Since the piston uses the medium pressure in the copper tube to act on the retaining ring, when the medium pressure in the copper tube increases, the pressure of the medium acting on the piston's force-bearing surface will also increase. The piston further presses the retaining ring, so that the retaining ring's clamping force on the copper tube increases synchronously. This ensures the reliability of the connection during use while being suitable for different medium pressure environments.

[0020] 3. Because a support sleeve is installed inside the main body, it can support the copper tube. At the same time, the smaller end of the retaining ring is inserted into the outer end of the support sleeve. Therefore, when the smaller end of the retaining ring is engaged with the outer wall of the copper tube, the inner support sleeve can directly provide support, ensuring the structural stability of the copper tube.

[0021] 4. Because a disassembly sleeve is inserted into the inner hole of the connector cap, when the pipe joint needs to be disassembled, the disassembly sleeve is pressed inward. The inner end of the disassembly sleeve can press against the inner side of the smaller end of the retaining ring, thereby causing the retaining ring to expand radially and release the copper pipe. In other words, the disassembly sleeve makes the pipe joint detachable and convenient. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a quick connector.

[0023] Figure 2 This is a cross-sectional view of the quick connector.

[0024] Figure 3 yes Figure 2 Enlarged view of the structure at point A in the middle.

[0025] Figure 4 This is a three-dimensional structural diagram of a piston.

[0026] Figure 5 yes Figure 2 Enlarged view of the structure at point B in the middle.

[0027] Figure 6 This is a three-dimensional structural diagram of the retaining ring.

[0028] Figure 7 This is a cross-sectional view of the quick connector in Embodiment 2.

[0029] Figure 8 This is a cross-sectional view of the quick connector in Embodiment 3.

[0030] Figure 9 This is a partial structural cross-sectional view of the quick connector in Embodiment 4.

[0031] Figure 10 This is a cross-sectional view of the quick connector in Embodiment 5.

[0032] Figure 11 This is a cross-sectional view of the quick connector in Embodiment Six.

[0033] Figure 12 This is a cross-sectional view of the quick connector in Embodiment 7.

[0034] In the diagram, 1. Main body; 11. Abutting surface; 12. Yielding cone surface; 13. Limiting stop edge; 2. Connecting cap; 21. Limiting part; 211. Stepped surface; 22. Shoulder; 23. Annular groove; 3. Snap ring; 31. Deformation notch; 4. Piston; 41. Force-bearing surface; 42. Abutting part; 43. Guide cone surface; 44. Outer sealing groove; 45. Inner sealing groove; 5. Yielding gap; 6. Outer sealing ring; 7. Inner sealing ring; 8. End sealing ring; 9. Support sleeve; 91. Disc-shaped part; 92. Insertion gap; 10. Disassembly sleeve; 101. Raised ring. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] Example 1:

[0037] like Figure 1 , Figure 2 As shown, a quick connector includes a tubular body 1, which is a straight pipe, i.e., a two-way connector. The outer circumferential surface of the body 1 is hexagonal, and the inner hole is a circular stepped hole, i.e., the diameter of the hole at both ends of the inner hole of the body 1 is larger than the diameter of the hole in the middle. Therefore, both ends of the inner hole of the body 1 have stepped end faces facing the port. The stepped end faces are flat abutting surfaces 11. Connecting caps 2 are fitted on both ends of the body 1. The inner circumferential surface of the connecting cap 2 is threaded with the outer circumferential surface of the body 1. The inner circumferential surface of the outer end of the connecting cap 2 has an annular limiting part 21. The inner diameter of the limiting part 21 is the same as the inner diameter of the inner end of the inner hole of the body 1, and the end face of the limiting part 21 facing the body 1 is a stepped surface 211. A retaining ring 3 is also provided inside the connecting cap 2. The retaining ring 3 is a conical plate-shaped metal ring. Pistons 4 are located at the larger diameter positions at both ends of the inner end of the main body 1. These pistons 4 are axially slidable and cylindrical. The outer circumferential surface of the piston 4 slides against the inner bore wall of the main body 1, and a sealing element is provided between the outer circumferential surface of the piston 4 and the inner bore wall of the main body 1. The inner bore of the piston 4 is circular, and its diameter is the same as the diameter of the inner end of the inner bore of the main body 1. A retaining ring 3 is located between the limiting part 21 of the connecting cap 2 and the piston 4. Specifically, the larger end of the retaining ring 3 faces the stepped surface 211 of the limiting part 21, and the smaller end faces the outer end face of the piston 4. The inner end face of the piston 4 is a force-bearing surface 41, which is opposite to the abutment surface 11 of the inner bore of the main body 1, with a clearance 5 between them. When the connecting cap 2 is tightened to its pre-positioned position, the larger end of the retaining ring 3 abuts against the stepped surface 211, and the smaller end abuts against the outer end of the piston 4. The inner hole of piston 4 is opposite to the center hole of retaining ring 3, that is, the connecting cap 2, retaining ring 3, piston 4 and body 1 are coaxially arranged.

[0038] Specifically, combined Figure 3 , Figure 4As shown, the piston 4 has a protruding abutment 42 on its force-bearing surface 41. The abutment 42 is annular and circumferentially disposed at the outer edge of the force-bearing surface 41. When the abutment 42 abuts against the abutment surface 11 of the inner hole of the main body 1, a clearance gap 5 is formed between the force-bearing surface 41 of the piston 4 and the abutment surface 11 of the inner hole of the main body 1, allowing the medium to enter and push the piston 4. At the inner end of the inner hole of the main body 1, i.e., at the position with a smaller hole diameter, the hole wall has an annular limiting flange 13 circumferentially. The inner edge of the abutment surface 11 of the inner hole of the main body 1 is chamfered to form a clearance cone 12. The larger end of the clearance cone 12 faces the force-bearing surface 41 of the piston 4, and the diameter of the larger end of the clearance cone 12 is larger than the diameter of the inner edge of the force-bearing surface 41. The smaller diameter end of the clearance cone 12 connects with the hole wall of the smaller hole diameter portion of the inner hole of the main body 1. This clearance cone 12 facilitates the entry of the medium into the clearance gap 5, thereby increasing the pushing force on the piston 4. The sealing element includes an outer sealing ring 6. An annular outer sealing groove 44 is circumferentially formed on the outer circumferential surface of the piston 4. The outer sealing ring 6 is fitted inside the outer sealing groove 44 and pressed against the inner wall of the main body 1. An annular inner sealing groove 45 is circumferentially formed on the inner circumferential surface of the piston 4. An inner sealing ring 7 is embedded in the inner sealing groove 45 to form a seal with the outer wall of the copper tube when it is inserted. An annular groove 23 is also circumferentially formed on the inner circumferential surface of the limiting part 21. An end sealing ring 8 is embedded in the annular groove 23 to form a seal with the outer wall of the copper tube. Figure 5 , Figure 6 As shown, in order to increase the elastic deformation capability of the retaining ring 3, several elongated deformation notches 31 are provided on the edges of both ends of the retaining ring 3, and the deformation notches 31 on the edges of both ends of the retaining ring 3 are spaced apart circumferentially. The stepped surface 211 of the connecting cap 2 also has a circumferentially annular shoulder 22, which surrounds the larger end of the retaining ring 3. The inner diameter of the smaller end of the retaining ring 3 is slightly smaller than the inner diameter of the piston 4. The piston 4 has a guide cone surface 43 circumferentially on the edge of the end opening facing the retaining ring 3, and when the piston 4 moves outward, the guide cone surface 43 can abut against the outer circumferential surface of the smaller end of the retaining ring 3. The larger end of the retaining ring 3 abuts against the stepped surface 211 axially and against the inner circumferential surface of the shoulder 22 radially.

[0039] In use, the end of the copper tube to be connected is inserted through the connecting cap 2. The end of the copper tube passes through the retaining ring 3 and is inserted into the piston 4 until the copper tube abuts against the limiting protrusion 13 of the inner hole of the main body 1. At this time, the inner sealing ring 7 on the piston 4 is pressed against the outer wall of the copper tube to form a seal. When the medium is introduced into the copper tube, the pressure of the medium in the copper tube acts on the force-bearing surface 41 of the piston 4 and pushes the piston 4 outward. Under the action of the medium pressure, the guide cone surface 43 at the outer end of the piston 4 will axially press the retaining ring 3. Since the retaining ring 3 is restricted by the step surface 211 and the shoulder 22, the retaining ring 3 is radially contracted and deformed under axial pressing, thereby clamping onto the outer wall of the copper tube and realizing the connection between the copper tube and the main body 1.

[0040] Example 2:

[0041] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 7 As shown, a support sleeve 9 is also provided inside the main body 1. The support sleeve 9 is located at the position of the larger diameter of the inner hole of the main body 1. The outer wall of the inner end of the support sleeve 9 has a disc-shaped portion 91 circumferentially. The outer circumferential wall of the disc-shaped portion 91 slides in fit with the inner hole wall of the main body 1. The piston 4 is sleeved on the support sleeve 9, and the inner end face of the piston 4 abuts against the side of the disc-shaped portion 91. An insertion gap 92 is formed between the inner circumferential surface of the piston 4 and the outer circumferential surface of the support sleeve 9. One end of the insertion gap 92 is opposite to the inner hole of the limiting portion 21 of the connecting cap 2. The outer end of the support sleeve 9 is inserted into the smaller end of the retaining ring 3. The abutting portion 42 is located at the outer edge of the inner side of the disc-shaped portion 91, and a clearance gap 5 is formed between the inner side of the disc-shaped portion 91 and the abutting surface 11 of the inner hole of the main body 1. When the copper tube to be connected is weak, the copper tube is inserted into the insertion gap 92, and the end of the copper tube is sleeved on the support sleeve 9. The support sleeve 9 can support the copper tube.

[0042] Example 3:

[0043] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 8 As shown, a disassembly sleeve 10 is inserted into the inner hole of the outer end of the connecting cap 2, that is, the disassembly sleeve 10 is inserted into the inner hole of the limiting part 21. A circumferential protrusion ring 101 is provided on the outer wall of the inner end of the disassembly sleeve 10 to restrict the disassembly sleeve 10 from being pulled out. The outer diameter of the disassembly sleeve 10 is larger than the inner diameter of the smaller end of the retaining ring 3, and the inner end of the disassembly sleeve 10 is opposite to the inner surface of the retaining ring 3. When the pipe joint needs to be disassembled, the disassembly sleeve 10 is pressed inward. The inner end of the disassembly sleeve 10 can press against the inner surface of the smaller end of the retaining ring 3, thereby causing the retaining ring 3 to expand radially and release the copper pipe.

[0044] Example 4:

[0045] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 9 As shown, one end of the connecting cap 2 is inserted into the inner hole of one end of the main body 1, and the outer peripheral surface of the connecting cap 2 is threadedly connected to the outer peripheral surface of the inner hole of the main body 1.

[0046] Example 5:

[0047] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 10 As shown, the main body 1 is a three-way valve and is T-shaped. The main body 1 has three ports, two of which are coaxially arranged and perpendicular to the center line of the third port. Each port has a piston 4 and a retaining ring 3 in its inner hole.

[0048] Example 6:

[0049] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 11 As shown, the main body 1 is a three-way valve and is Y-shaped. The main body 1 has three ports, which are evenly distributed around the circumference. That is, the angle between the center lines of two adjacent ports is 120°. Each port has a piston 4 and a retaining ring 3 in its inner hole.

[0050] Example 7:

[0051] The structure of this quick connector is basically the same as that of Embodiment 1, the difference being that... Figure 12 As shown, the main body 1 is a three-way valve and is Y-shaped. The main body 1 has three ports, two of which face the same direction and the third port faces the opposite direction. The center lines of the three ports are parallel. Each port has a piston 4 and a retaining ring 3 in its inner hole.

[0052] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0053] Although this document uses terms such as "body 1," "abutment surface 11," and "yielding cone surface 12" frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A quick coupling comprising a tubular body (1) and a coupling cap (2) connected to the end of the body (1), the inner wall of the coupling cap (2) having a stepped surface (211) arranged towards the end face of the body (1), and a snap ring (3) in the form of a conical sheet being arranged in the coupling cap (2), characterized in that The inner hole of the end of the main body (1) is provided with a piston (4) capable of axial sliding, the snap ring (3) is located between the stepped surface (211) of the connecting cap (2) and the outer end surface of the piston (4), and the smaller end of the snap ring (3) faces the piston (4), the inner end of the piston (4) has a stress surface (41) facing the inner end of the inner hole of the main body (1), the piston (4) is in a cylindrical shape, and the inner hole of the piston (4) is opposite to the center hole of the snap ring (3), and an annular sealing element is arranged between the circumferential outer side of the piston (4) and the circumferential inner side of the main body (1).

2. The quick coupling of claim 1, wherein, The inner hole of the main body (1) is a stepped hole with a larger hole diameter at the port end and a smaller hole diameter at the inner end, and the stepped surface of the inner hole of the main body (1) is an abutting surface (11) facing the port, the piston (4) is arranged at the position with a larger hole diameter, and the stress surface (41) of the piston (4) and the abutting surface (11) have a clearance gap (5) in communication with the inner end of the inner hole of the main body (1).

3. The quick coupling of claim 2, wherein, The inner end surface of the piston (4) is the stress surface (41) mentioned above, and the stress surface (41) of the piston (4) has a protruding abutting portion (42), which can abut against the abutting surface (11) of the inner hole of the main body (1).

4. The quick coupling of claim 3, wherein, The inner edge of the abutting surface (11) of the inner hole of the main body (1) has a clearance taper (12) in the circumferential direction, the larger end of the clearance taper (12) faces the stress surface (41) of the piston (4), and the diameter of the larger end of the clearance taper (12) is larger than the diameter of the inner edge of the stress surface (41).

5. Quick coupling according to any of claims 1-4, characterized in that The sealing element includes an outer sealing ring (6), and the outer circumferential surface of the piston (4) is provided with an annular outer sealing groove (44) in the circumferential direction, and the outer sealing ring (6) is sleeved in the outer sealing groove (44) and is pressed against the inner hole wall of the main body (1).

6. Quick coupling according to any of claims 1-4, characterized in that The edges of both ends of the snap ring (3) are provided with a plurality of long strip-shaped deformation notches (31), and the deformation notches (31) of the edges of both ends of the snap ring (3) are arranged in the circumferential direction, and the inner diameter of the smaller end of the snap ring (3) is slightly smaller than the inner diameter of the piston (4).

7. Quick coupling according to claim 6, characterized in that The end of the piston (4) facing the snap ring (3) has a guide taper (43) on the circumferential edge of the orifice, and the guide taper (43) can abut against the outer circumferential surface of the snap ring (3) when the piston (4) moves outward.

8. The quick coupling of any one of claims 1 to 4, wherein, The connecting cap (2) is sleeved on the end of the main body (1), and the connecting cap (2) is threadedly connected with the main body (1), the inner circumferential surface of the outer end of the connecting cap (2) has an annular limiting portion (21) in the circumferential direction, the stepped surface (211) mentioned above is the end surface of the limiting portion (21) facing the main body (1), and the stepped surface (211) further has an annular shoulder (22) in the circumferential direction, and the shoulder (22) surrounds the larger end of the snap ring (3).

9. The quick coupling of any one of claims 1 to 4, wherein, The main body (1) is further provided with a support sleeve (9), the inner end outer wall of the support sleeve (9) has a disc-shaped portion (91) in the circumferential direction, the piston (4) is sleeved on the support sleeve (9), and the inner end surface of the piston (4) abuts against the side surface of the disc-shaped portion (91), the inner circumferential surface of the piston (4) and the outer circumferential surface of the support sleeve (9) form an insertion gap (92), and the outer end of the support sleeve (9) is inserted into the smaller end of the snap ring (3).

10. The quick coupling of any one of claims 1 to 4, wherein, The inner hole of the outer end of the connecting cap (2) is inserted with a dismounting sleeve (10), the outer diameter of the dismounting sleeve (10) is greater than the inner diameter of the smaller end of the snap ring (3), and the inner end of the dismounting sleeve (10) is opposite to the inner side surface of the snap ring (3).

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