Quick connector

Abstract

The invention 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] The invention belongs to the technical field of pipe joints and relates to a quick joint. Background Art

[0002] Pipe fittings are the connection tools between pipes and play an indispensable role in pipe fittings. They are one of the two main components of hydraulic pipes. There are many types of pipe fittings. Commonly used pipe fittings can generally be divided into two types: hard pipe fittings and hose fittings. If classified according to the connection method between pipe fittings and pipes, hard pipe fittings can be divided into three types: flared type, ferrule type and welding type.

[0003] For example, the patent document (application number: 202122455819.5) discloses a quick water pipe connector for indoor water supply and drainage pipeline laying. A plurality of elastic arms are obliquely protruded along the circumferential direction through the inner wall of the metal clamp ring. The elastic arms enclose a cone-shaped structure. The three water pipes to be connected are respectively inserted into the plug-in groove along the through hole of the nut. The elastic arms are respectively abutted and clamped against the outer wall of the water pipe, and the three water pipes are quickly connected and fixed by tightening the nut. When using the quick connector, the end of the water pipe is first inserted into the nut and passed through the metal clamp ring, and then the nut is rotated. The nut presses the metal clamp ring. Since the metal clamp ring is conical, the elastic arm has a tendency to fold radially inward when subjected to axial pressure, so that the elastic arm on the metal clamp ring is clamped on the outer wall of the water pipe. Therefore, the quick connector still needs to manually rotate the nut when in use, which is inconvenient to operate. At the same time, different people will also make the tightening degree of the nut different, resulting in different clamping forces of the metal clamp ring on the water pipe. After the nut is tightened, the clamping force of the metal clamp ring on the water pipe will not change. However, when water flows through the water pipe, a large water pressure will be generated. If the water pressure is large, the water pipe will easily fall out due to insufficient clamping force of the metal clamp ring. Therefore, the quick connector still has the problems of inconvenient operation and low connection reliability. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide a quick connector which has high convenience in use and connection reliability.

[0005] The objective of the present invention can be achieved through the following technical scheme: a quick connector, comprising a tubular main body and a connecting cap connected to the end of the main body, the inner wall of the connecting cap having a step surface arranged toward the end face of the main body, a conical sheet-shaped retaining ring is also arranged in the connecting cap, characterized in that a piston capable of axial sliding is arranged in the inner hole of the end of the main body, the retaining ring is located between the step 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 main body, the piston is cylindrical, and the inner hole of the piston is opposite to the center hole of the retaining ring, and an annular seal is arranged between the circumferential outer side of the piston and the circumferential inner side of the main body.

[0006] The retaining ring is arranged in the connecting cap, and the piston is arranged in the main body, so that the connecting cap, the retaining ring, the piston and the end of the main body are arranged coaxially. The retaining ring is in the shape of a cone, so it can shrink and deform radially inward when subjected to axial top pressure. The piston is in the shape of a cylinder, and the retaining ring is axially limited between the step surface of the connecting cap and the end surface of the piston. The piston can slide axially relative to the main body, but after assembling and tightening the connecting cap, the piston will be axially limited by the retaining ring. The pipe joint can be applied to a variety of fields, such as water pipes, refrigeration copper pipes, etc. Taking the copper pipe as an example, when in use, the end of the copper pipe that needs to be butted is inserted from the connecting cap, and then passes through the clamping ring and is inserted into the piston. At this time, a seal is formed between the inner circumference of the piston and the outer circumference of the copper pipe. The seal can be formed by setting a sealing component between the outer wall of the copper pipe and the inner wall of the piston. The outer circumference of the piston and the inner circumference of the main body are sealed by the sealing member, and the inner end of the piston has a force-bearing surface facing the inner end of the inner hole of the main body. Therefore, when the medium is passed into the copper pipe, the medium pressure in 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 the clamping ring. Since the larger end of the clamping ring is restricted by the step surface, the smaller end of the clamping ring is radially contracted and deformed inward under the axial pressure, thereby holding the copper pipe tightly to achieve the connection between the copper pipe and the main body. When operating, it is only necessary to insert the copper pipe and release the medium. The clamping ring clamps the copper pipe using the medium pressure in the copper pipe, and there is no need to manually apply force to rotate the connecting cap, so the operation is more convenient. At the same time, unlike the existing clamping ring, which is clamped by tightening the nut to press and clamp, resulting in a fixed clamping force, and there is a risk of the pipe fitting falling out when the force exerted by the medium pressure on the pipe fitting is greater than the clamping force, the piston of the present application utilizes the medium pressure of the copper tube to act on the clamping ring, so that the clamping ring clamps the copper tube. Therefore, when the medium pressure in the copper tube increases, the pressure of the medium acting on the force-bearing surface of the piston will also increase. The piston further compresses the clamping ring, so that the clamping force of the clamping ring on the copper tube increases synchronously, that is, the clamping force of the clamping ring on the copper tube increases with the increase of the internal medium pressure, thereby ensuring the connection reliability during use while being suitable for different medium pressure environments.

[0007] In the above-mentioned quick connector, the inner hole of the main body is a stepped hole with a larger hole diameter at the port than the inner end hole diameter, and the stepped surface of the inner hole of the main body is an abutment surface facing the port, the piston is arranged at a position with a larger hole diameter, and there is a clearance between the force-bearing surface and the abutment surface of the piston, which is connected to the inner end of the inner hole of the main body. The inner hole of the main body is a stepped hole, and the end with a larger hole diameter is used to accommodate the piston, so that the hole diameter of the inner hole of the piston is roughly the same as the hole diameter of the inner end of the inner hole of the main body, avoiding flow restriction of the medium due to the small inner hole of the piston, and also making the piston have a larger outer diameter, which also makes the piston have a larger force-bearing surface area, and the medium can enter the clearance gap and act on the force-bearing surface, thereby generating a larger thrust on the piston, improving the clamping force of the clamping ring on the copper tube, and the outer end face of the piston is opposite to the stepped surface of the connecting cap to form a space for accommodating the clamping ring.

[0008] In the above-mentioned quick connector, the inner end face of the piston is the above-mentioned force-bearing surface, and there is a protruding abutting portion on the force-bearing surface of the piston, which can abut on the abutting surface of the inner hole of the main body. The force-bearing surface is opposite to the abutting surface. In order to form a clearance gap of sufficient space and ensure a larger force-bearing surface, the abutting portion is annular and located at the outer edge of the piston force-bearing surface. When the abutting portion abuts against the abutting surface, the clearance gap formed between the radially inner force-bearing surface and the abutting surface is connected to the inner end of the inner hole of the main body. The medium can enter the clearance gap and act on the force-bearing surface of the piston, thereby generating sufficient and uniform thrust on the piston, ensuring that the piston is stably pressed on the clamping ring, and then ensuring the stability and reliability of the clamping ring clamping the copper tube.

[0009] In the above-mentioned quick connector, the inner edge of the abutment surface of the inner hole of the main body has a circumferentially arranged yielding cone surface, the larger end of the yielding cone surface faces the force-bearing surface of the piston, and the larger end of the yielding cone surface has a diameter greater than the diameter of the inner edge of the force-bearing surface. The yielding cone surface can reduce the area of ​​the abutment surface, thereby reducing the shielding of the force-bearing surface by the abutment surface, and the yielding cone surface also has a guiding effect on the medium. Different from the medium entering the yielding gap radially and acting on the force-bearing surface of the piston, the yielding cone surface allows the medium in the inner hole of the main body to directly impact the force-bearing surface of the piston along the yielding cone surface, making full use of the flow kinetic energy of the medium to make the piston press the clamping ring, thereby improving the stability and reliability of the clamping ring when clamping.

[0010] In the above-mentioned quick connector, the inner circumference of the inner hole of the main body has an annular limiting convex edge in the circumferential direction. When in use, the copper tube end is inserted from the connection cap until the copper tube end abuts against the limiting convex edge and is inserted into place, and there is no need to deliberately control the insertion length of the copper tube, which is more convenient to use.

[0011] In the above-mentioned quick connector, the sealing member includes an outer sealing ring, and an annular outer sealing groove is circumferentially formed on the outer circumferential surface of the piston. The outer sealing ring is sleeved in the outer sealing groove and pressed against the inner hole wall of the main body. The sealing ring seals the outer circumferential side of the piston and the inner hole wall of the main body, so that the medium pressure in the copper tube fully acts on the piston, so that the piston generates sufficient top pressure on the clamping ring, and the connection reliability is ensured.

[0012] In the above-mentioned quick connector, the edges of both ends of the clamping ring are provided with a plurality of long strip-shaped deformation notches, and the deformation notches of the edges of both ends of the clamping ring are arranged at intervals along the circumferential direction, and the inner diameter of the smaller end of the clamping ring is slightly smaller than the inner diameter of the piston. The clamping ring adopts a sheet-shaped metal ring and has deformation notches circumferentially, so it can shrink and deform when subjected to axial top pressure, and the smaller end of the clamping ring faces the piston, so when the copper tube is inserted, even if the outer diameter of the copper tube is large, the clamping ring can be radially pushed open, and the applicability is strong. When subjected to piston top pressure, the smaller end can also fully deform radially inward and clamp on the outer wall of the copper tube, forming an undercut effect on the copper tube, thereby improving the connection reliability.

[0013] In the above-mentioned quick connector, the piston has a guide cone surface along the circumference of the hole edge at one end facing the clamping ring, and when the piston moves outward, the guide cone surface can be pressed against the outer peripheral surface of the clamping ring. When the medium is introduced into the copper tube, the piston moves outward under the action of the medium pressure, so that the guide cone surface is pressed against the tapered outer peripheral surface of the clamping ring, and the abutment between the two is more stable, and the piston is prevented from damaging the clamping ring due to stress concentration at the corners, resulting in local concave deformation of the clamping ring. At the same time, the guide cone surface also guides the radial contraction of the clamping ring, making its radial contraction deformation smoother. After the clamping and fixing of the copper tube is completed, the piston is pressed against the clamping ring through the guide cone surface, and the stability is higher.

[0014] In the above-mentioned quick connector, the connection cap is sleeved on the end of the main body, and the connection cap is threadedly connected to the main body. An annular limiting portion is circumferentially provided on the inner circumferential surface of the outer end of the connection cap. The step surface is the end surface of the limiting portion facing the main body. The step surface also has an annular convex shoulder circumferentially, and the convex shoulder surrounds the larger end of the clamping ring. The connection cap is threadedly connected to the main body, which facilitates the assembly of the pipe joint. When the copper pipe is inserted, the connection cap can be rotated in advance, so that the step surface of the connection cap presses the clamping ring, and the clamping ring pre-positions the copper pipe, and then the medium is passed, which is more reliable.

[0015] In the above-mentioned quick connector, a support sleeve is also provided in the main body, and a disc-shaped portion is circumferentially provided on the outer wall of the inner end of the support sleeve. 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. A plug-in gap is formed between the inner circumference of the piston and the outer circumference of the support sleeve, and the outer end of the support sleeve is inserted into the smaller end of the clamping ring. When the copper tube to be docked is weak in strength, the clamping ring clamped on the outer wall of the copper tube will cause the copper tube to deform or break. For this reason, a support sleeve is provided in the main body, and the copper tube is inserted in the plug-in gap, that is, the end of the copper tube is sleeved on the support sleeve, and the support sleeve can support the copper tube. At the same time, the outer end of the support sleeve is inserted into the smaller end of the clamping ring. Therefore, when the smaller end of the clamping ring is clamped on the outer wall of the copper tube, the inner support sleeve can directly support it, thereby ensuring the structural stability of the copper tube. The disc-shaped portion on the support sleeve is used for medium pushing, so that the support sleeve moves outward together with the piston and presses the clamping ring.

[0016] In the above-mentioned quick connector, a disassembly sleeve is inserted into the inner hole of the outer end of the connection cap, the outer diameter of the disassembly sleeve is larger than the inner diameter of the smaller end of the clamping ring, and the inner end of the disassembly sleeve is opposite to the inner side surface of the clamping ring. When the pipe joint needs to be disassembled, the disassembly sleeve is pressed inwardly, and the inner end of the disassembly sleeve can press the inner side surface of the smaller end of the clamping ring, so that the clamping ring expands radially and releases the copper tube, that is, the setting of the disassembly sleeve makes the pipe joint detachable and convenient.

[0017] Compared with the prior art, this quick connector has the following advantages:

[0018] 1. During operation, you only need to insert the copper tube and release the medium. The clamping ring uses the medium pressure in the copper tube to clamp the copper tube. There is no need to manually apply force to rotate the connecting cap, so the operation is more convenient.

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

[0020] 3. Since a support sleeve is arranged inside the main body, the copper tube can be supported. At the same time, the outer end of the support sleeve is inserted into the smaller end of the clamp ring. Therefore, when the smaller end of the clamp ring is clamped on the outer wall of the copper tube, the inner support sleeve can directly support it to ensure the structural stability of the copper tube.

[0021] 4. Since a disassembly sleeve is inserted into the inner hole of the connecting cap, when the pipe joint needs to be disassembled, the disassembly sleeve is pressed inward, and the inner end of the disassembly sleeve can press the inner side surface of the smaller end of the clamping ring, thereby causing the clamping ring to expand radially and release the copper tube. That is, the setting of the disassembly sleeve makes the pipe joint detachable and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a structural cross-sectional view of a quick connector.

[0024] Figure 3 yes Figure 2 A magnified view of the structure at center.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the piston.

[0026] Figure 5 yes Figure 2 A magnified view of the structure at point B.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the snap ring.

[0028] Figure 7 It is a structural cross-sectional view of the quick connector in the second embodiment.

[0029] Figure 8 It is a structural cross-sectional view of the quick connector in the third embodiment.

[0030] Fig. 9 It is a partial structural sectional view of the quick connector in the fourth embodiment.

[0031] Fig.10 It is a structural cross-sectional view of the quick connector in the fifth embodiment.

[0032] Fig.11 It is a structural cross-sectional view of the quick connector in the sixth embodiment.

[0033] Fig.12 It is a structural cross-sectional view of the quick connector in the seventh embodiment.

[0034] In the figure, 1, main body; 11, abutment surface; 12, yielding cone surface; 13, limiting stop edge; 2, connecting cap; 21, limiting part; 211, step surface; 22, shoulder; 23, annular groove; 3, retaining ring; 31, deformation notch; 4, piston; 41, force surface; 42, abutment 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, supporting sleeve; 91, disc-shaped part; 92, plug-in gap; 10, disassembly sleeve; 101, convex ring. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] Embodiment 1:

[0037] like Figure 1 , Figure 2 As shown, a quick connector includes a tubular main body 1, which is a straight tube, i.e., a two-way tube. The outer circumferential surface of the main body 1 is an external hexagonal shape, and the inner hole is a circular stepped hole, i.e., the apertures at both ends of the inner hole of the main body 1 are larger than the aperture in the middle, so both ends of the inner hole of the main body 1 have stepped end surfaces facing the port, and the stepped end surfaces are flat abutment surfaces 11. Connecting caps 2 are sleeved on both ends of the main body 1, and the inner circumferential surface of the connecting cap 2 is threadedly matched with the outer circumferential surface of the main body 1. An annular limiting portion 21 is circumferentially provided on the inner circumferential surface of the outer end of the connecting cap 2, and the inner diameter of the limiting portion 21 is the same as the inner diameter of the inner end of the inner hole of the main body 1, and the end surface of the limiting portion 21 facing the main body 1 is a stepped surface 211. A clamping ring 3 is also provided in the connecting cap 2, and the clamping ring 3 is a conical sheet-shaped metal ring. A piston 4 is provided at the positions with larger diameters at both ends of the inner end of the main body 1. The piston 4 can slide in the axial direction. The piston 4 is cylindrical. The outer peripheral surface of the piston 4 slides with the inner hole wall of the main body 1, and a seal is provided between the outer peripheral surface of the piston 4 and the inner hole wall of the main body 1. The inner hole of the piston 4 is a circular hole, and the diameter of the inner hole of the piston 4 is the same as the diameter of the inner end of the inner hole of the main body 1. The snap ring 3 is located between the limiting portion 21 of the connecting cap 2 and the piston 4, that is, the larger end of the snap ring 3 faces the step surface 211 of the limiting portion 21, and the smaller end faces the outer end surface of the piston 4. The inner end surface of the piston 4 is a force-bearing surface 41, which is opposite to the abutting surface 11 of the inner hole of the main body 1, and there is a clearance gap 5 between the two. When the connecting cap 2 is tightened for pre-positioning, the larger end of the snap ring 3 abuts on the step surface 211, and the smaller end abuts on the outer end of the piston 4. The inner hole of the piston 4 is opposite to the central hole of the clamp ring 3 , that is, the connecting cap 2 , the clamp ring 3 , the piston 4 and the main body 1 are coaxially arranged.

[0038] Specifically, combined Figure 3 , Figure 4As shown, the force-bearing surface 41 of the piston 4 has a protruding abutting portion 42, which is annular and circumferentially arranged at the outer edge of the force-bearing surface 41. When the abutting portion 42 abuts against the abutting 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 abutting surface 11 of the inner hole of the main body 1, which is used for the medium to enter and push the piston 4. The inner end of the inner hole of the main body 1, that is, the hole wall at the position with a smaller aperture, has an annular limit stop edge 13 circumferentially. The inner edge of the abutting surface 11 of the inner hole of the main body 1 is chamfered to form a clearance cone surface 12, the larger end of the clearance cone surface 12 faces the force-bearing surface 41 of the piston 4, and the larger end of the clearance cone surface 12 has a diameter greater than the diameter of the inner edge of the force-bearing surface 41, and the smaller end of the clearance cone surface 12 is connected with the hole wall of the smaller part of the inner hole of the main body 1. The clearance cone surface 12 facilitates the medium to enter the clearance gap 5, thereby increasing the thrust on the piston 4. The seal includes an outer sealing ring 6. An annular outer sealing groove 44 is circumferentially provided on the outer circumference of the piston 4. The outer sealing ring 6 is sleeved in the outer sealing groove 44 and pressed against the inner hole wall of the main body 1. An annular inner sealing groove 45 is circumferentially provided on the inner circumference 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 the copper tube is inserted. Of course, an annular groove 23 is also circumferentially provided on the inner circumference of the limiting portion 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 capacity of the snap ring 3, a plurality of long strip-shaped deformation notches 31 are provided on the edges of both ends of the snap ring 3, and the deformation notches 31 on the edges of both ends of the snap ring 3 are arranged at intervals along the circumferential direction. The step surface 211 of the connection cap 2 also has an annular convex shoulder 22 circumferentially, and the convex shoulder 22 surrounds the larger end of the snap ring 3. The inner diameter of the smaller end of the snap ring 3 is slightly smaller than the inner diameter of the piston 4. A guide cone 43 is provided circumferentially on the edge of the orifice of the end of the piston 4 facing the snap ring 3, and when the piston 4 moves outward, the guide cone 43 can be pressed against the outer circumferential surface of the smaller end of the snap ring 3, and the larger end of the snap ring 3 is pressed against the step surface 211 axially and against the inner circumferential surface of the convex shoulder 22 radially.

[0039] When in use, the end of the copper tube to be connected is inserted from the connecting cap 2, and the end of the copper tube passes through the clamping ring 3 and is inserted into the piston 4 until the copper tube abuts against the limiting convex edge 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 and forms a seal. When the medium is passed into the copper tube, the medium pressure 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 clamping ring 3. Since the clamping ring 3 is restricted by the step surface 211 and the boss 22, the clamping ring 3 shrinks and deforms radially inward under the axial pressure, thereby clamping on the outer wall of the copper tube to achieve the connection between the copper tube and the main body 1.

[0040] Embodiment 2:

[0041] The structure of the quick connector is basically the same as that of the first embodiment. Figure 7 As shown, a support sleeve 9 is also provided in the main body 1, and the support sleeve 9 is arranged at a position where the inner hole diameter of the main body 1 is larger. The inner end outer wall of the support sleeve 9 has a disc-shaped portion 91 in the circumferential direction. The outer peripheral wall of the disc-shaped portion 91 is slidably matched 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. A plug-in gap 92 is formed between the inner peripheral surface of the piston 4 and the outer peripheral surface of the support sleeve 9. One end port of the plug-in 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 clamp 3. The abutment portion 42 is located at the outer edge of the inner side surface of the disc-shaped portion 91, and a clearance gap 5 is formed between the inner side surface of the disc-shaped portion 91 and the abutment surface 11 of the inner hole of the main body 1. When the strength of the copper tube to be butted is weak, the copper tube is inserted into the plug-in gap 92, and the end of the copper tube is sleeved on the support sleeve 9, and the support sleeve 9 can support the copper tube.

[0042] Embodiment three:

[0043] The structure of the quick connector is basically the same as that of the first embodiment. Figure 8 As shown, a disassembly sleeve 10 is inserted into the inner hole of the outer end of the connection cap 2, that is, the disassembly sleeve 10 is inserted into the inner hole of the limiting portion 21, and a convex ring 101 is provided circumferentially on the outer wall of the inner end of the disassembly sleeve 10 to limit the disassembly sleeve 10 from being pulled out, and the outer diameter of the disassembly sleeve 10 is larger than the inner diameter of the smaller end of the clamping ring 3, and the inner end of the disassembly sleeve 10 is opposite to the inner side surface of the clamping ring 3. When the pipe joint needs to be disassembled, the disassembly sleeve 10 is pressed inwardly, and the inner end of the disassembly sleeve 10 can press the inner side surface of the smaller end of the clamping ring 3, so that the clamping ring 3 expands radially to release the copper tube.

[0044] Embodiment 4:

[0045] The structure of the quick connector is basically the same as that of the first embodiment. Fig. 9 As shown, one end of the connection cap 2 is inserted into the inner hole at one end of the main body 1, and the outer circumference of the connection cap 2 is threadedly connected to the outer circumference of the inner hole of the main body 1.

[0046] Embodiment five:

[0047] The structure of the quick connector is basically the same as that of the first embodiment. Fig.10 As shown, the main body 1 is a three-way and 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. A piston 4 and a retaining ring 3 are arranged in the inner hole of each port.

[0048] Embodiment six:

[0049] The structure of the quick connector is basically the same as that of the first embodiment. Fig.11 As shown, the main body 1 is a tee and is Y-shaped. The main body 1 has three ports, which are evenly distributed along the circumference, that is, the center line angle between two adjacent ports is 120°, and a piston 4 and a retaining ring 3 are provided in the inner hole of each port.

[0050] Embodiment seven:

[0051] The structure of the quick connector is basically the same as that of the first embodiment. Fig.12 As shown, the main body 1 is a tee and is Y-shaped. The main body 1 has three ports, two of which are oriented in the same direction, the third port is oriented in the opposite direction, and the center lines of the three ports are parallel. A piston 4 and a retaining ring 3 are provided in the inner hole of each port.

[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0053] Although the terms such as main body 1, abutment surface 11, and relief cone surface 12 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A quick connector, comprising a tubular body (1) and a connecting cap (2) connected to the end of the body (1), wherein the inner wall of the connecting cap (2) has a step surface (211) arranged toward the end surface of the body (1), and a conical sheet-shaped clamping ring (3) is also arranged inside the connecting cap (2), characterized in that: A piston (4) capable of axial sliding is provided in the inner hole at the end of the main body (1); the retaining ring (3) is located between the step surface (211) of the connecting cap (2) and the outer end surface of the piston (4); the smaller end of the retaining ring (3) faces the piston (4); the inner end of the piston (4) has a force-bearing surface (41) facing the inner end of the inner hole of the main body (1); the piston (4) is cylindrical, and the inner hole of the piston (4) is opposite to the center hole of the retaining ring (3); and an annular sealing member is provided between the circumferential outer side of the piston (4) and the circumferential inner side of the main body (1).

2. The quick connector according to claim 1, characterized in that: The inner hole of the main body (1) is a stepped hole with a larger hole diameter at the port than at the inner end, and the stepped surface of the inner hole of the main body (1) is an abutment surface (11) facing the port. The piston (4) is arranged at a position with a larger hole diameter, and a clearance gap (5) is provided between the force-bearing surface (41) of the piston (4) and the abutment surface (11) that is connected to the inner end of the inner hole of the main body (1).

3. The quick connector according to claim 2, characterized in that: The inner end surface of the piston (4) is the above-mentioned force-bearing surface (41), and a protruding abutting portion (42) is provided on the force-bearing surface (41) of the piston (4), and the abutting portion (42) can abut against the abutting surface (11) of the inner hole of the main body (1).

4. The quick connector according to claim 3, characterized in that: The inner edge of the abutting surface (11) of the inner hole of the main body (1) is provided with a circumferentially disposed yielding conical surface (12), the larger end of which faces the force-bearing surface (41) of the piston (4), and the larger end of which has a diameter greater than the diameter of the inner edge of the force-bearing surface (41).

5. The quick connector according to any one of claims 1 to 4, characterized in that: The sealing member comprises an outer sealing ring (6). An annular outer sealing groove (44) is circumferentially formed on the outer peripheral surface of the piston (4). The outer sealing ring (6) is sleeved in the outer sealing groove (44) and pressed against the inner hole wall of the main body (1).

6. The quick connector according to any one of claims 1 to 4, characterized in that: The edges of both ends of the clamping 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 clamping ring (3) are arranged at intervals along the circumferential direction. The inner diameter of the end with the smaller diameter of the clamping ring (3) is slightly smaller than the inner diameter of the piston (4).

7. The quick connector according to claim 6, characterized in that: The piston (4) has a guide conical surface (43) in the circumferential direction on the edge of the hole at one end facing the clamping ring (3), and when the piston (4) moves outward, the guide conical surface (43) can be in contact with the outer circumferential surface of the clamping ring (3).

8. The quick connector according to any one of claims 1 to 4, characterized in that: The connecting cap (2) is sleeved on the end of the main body (1), and the connecting cap (2) is threadedly connected to the main body (1). An annular limiting portion (21) is circumferentially provided on the inner circumferential surface of the outer end of the connecting cap (2). The step surface (211) is the end surface of the limiting portion (21) facing the main body (1). The step surface (211) also has an annular convex shoulder (22) circumferentially, and the convex shoulder (22) surrounds the larger end of the clamping ring (3).

9. The quick connector according to any one of claims 1 to 4, characterized in that: A support sleeve (9) is also provided inside the main body (1), and a disc-shaped portion (91) is circumferentially provided on the outer wall of the inner end of the support sleeve (9). 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). 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), and the outer end of the support sleeve (9) is inserted into the smaller end of the retaining ring (3).

10. The quick connector according to any one of claims 1 to 4, characterized in that: A disassembly sleeve (10) is inserted into the inner hole at the outer end of the connection cap (2), the outer diameter of the disassembly sleeve (10) is larger than the inner diameter of the smaller end of the snap ring (3), and the inner end of the disassembly sleeve (10) is opposite to the inner side surface of the snap ring (3).

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