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 connection reliability. The quick connector comprises a tubular main body and two nuts respectively sleeved at two ends of the main body, the nuts are in threaded connection with the main body, clamping rings are arranged in inner holes of the nuts, the clamping rings are in circular truncated cone sheet shapes, the smaller ends of the clamping rings face the end face of the main body, and step surfaces facing the end face of the main body are further arranged on the inner walls of the nuts. When the nut is screwed tightly, the step face can abut against the large end of the clamping ring, so that the small end of the clamping ring abuts against the end face of the body and deforms till the minimum inner diameter is smaller than the inner diameter of a port of the body. The quick connector has high connection reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipe joint technical field relates to a quick coupling. BACKGROUND

[0002] Pipe joint is the connecting tool between pipeline and pipeline, and plays an indispensable important role in pipe fitting, and it is one of two main components of hydraulic pipeline. Pipe joint has many kinds, and commonly used pipe joint can be divided into two kinds of hard pipe joint and hose joint, if according to the connecting mode of pipe joint and pipeline, hard pipe joint has three kinds of flaring type, sleeve type and welding type.

[0003] Such as patent document (application number: 202022810912.9) discloses the corrugated pipe quick coupling of snap ring assembly, including main joint, auxiliary joint and snap ring assembly, the one end of main joint is connection end, the other end is connected with the inner thread interface of the one end of auxiliary joint through outer thread interface and is locked in connection, the other end of auxiliary joint is equipped with the pipe for wearing the pipe of corrugated pipe, and the inner thread interface is formed in auxiliary joint The guide hole of gradually reducing caliber from pipe hole, the snap ring assembly opposite to the end of outer thread interface of main joint is arranged in the guide hole, and when main joint is locked with auxiliary joint, the snap ring assembly is along guide hole and is reduced to the annular groove of the ring of auxiliary joint and is locked and limited by caliber sliding. When connecting corrugated pipe, the outer thread interface of main joint is equipped with the first sealing ring, and the end face of first sealing ring extends the end of outer thread interface and abuts against snap ring assembly, when snap ring assembly extrudes first sealing ring, reliable sealing is formed between the outer thread interface of main joint and corrugated pipe. When the quick coupling is locked, the snap ring assembly is pressed on the first sealing ring, but the first sealing ring has elasticity, and it is difficult to form stable support for the snap ring assembly, and when the corrugated pipe is subjected to greater tension, the snap ring assembly has the risk of compressing the first sealing ring and separating from the corrugated pipe, and the connection reliability is low. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in prior art, and provides a kind of quick coupling, which has higher connection reliability.

[0005] The utility model discloses a kind of quick couplings, including tubular main body and two respectively sleeve set in the nut of both ends of main body, the nut is threadedly connected with main body, it is characterized in that, the nut inner hole is equipped with snap ring, the snap ring is circular platform sheet, and smaller one end is towards main body end face, the nut inner wall also has step surface towards main body end face, when nut is tightened, step surface can press and hold larger one end of snap ring, so that smaller one end of snap ring is pressed on main body end face and is deformed to minimum inner diameter less than main body end port inner diameter.

[0006] When in use, two pipe fittings to be connected are inserted from two nuts respectively until they extend into the inner hole of the main body, at this time, two clamping rings are respectively sleeved on the two pipe fittings, when the nuts are tightened, the two nuts can be relatively close, that is, the stepped surface in the nut can be close to the end surface of the main body, so that the stepped surface can press the larger end of the clamping ring, since the clamping ring is in the shape of a circular truncated cone, and the smaller end abuts against the end surface of the main body, so that the smaller end of the clamping ring can slide radially inward along the end surface of the main body, so that the smaller end of the clamping ring is radially contracted until the minimum inner diameter is smaller than the inner diameter of the end port of the main body, so that the smaller end of the clamping ring is clamped or embedded on the outer peripheral surface of the pipe fitting, thereby realizing the connection of the two pipe fittings, which is convenient and fast. Since the larger end of the clamping ring is pressed against the stepped surface of the nut, and the end surface of the main body also restricts the smaller end of the clamping ring, the clamping ring always stably clamps the pipe fitting, and the connection is highly reliable.

[0007] In the above quick connector, the taper of the clamping ring is greater than or equal to 45°. The taper is arranged so that the radial component force of the larger end of the clamping ring is greater than the axial component force when the larger end is pressed, so that the clamping ring is better radially contracted and deformed, and the clamping force on the pipe fitting is greater.

[0008] In the above quick connector, the clamping ring is made of metal material and has elasticity. The metal material improves the reliability, and the elasticity enables the clamping ring to radially contract and deform under the pressing of the nut, so as to clamp the pipe fitting and improve the reliability.

[0009] In the above quick connector, the stepped surface further has an annular limiting portion in the circumferential direction, the limiting portion surrounds the larger end of the clamping ring, and the inner edge of the larger end of the clamping ring abuts against the stepped surface and the outer edge abuts against the inner peripheral surface of the limiting portion. The limiting portion limits the clamping ring in the radial direction, that is, when the stepped surface presses the clamping ring, the limiting portion can avoid the larger end of the clamping ring from radially expanding and deforming, so that the clamping ring can only radially contract and deform, and then clamp the pipe fitting, thereby improving the connection reliability.

[0010] In the above quick connector, the end surface of the smaller end of the clamping ring is a locking surface, the locking surface is tapered, and the edge of the larger end of the locking surface abuts against the end surface of the main body. When the nut is locked, the clamping ring is deformed so that the inner diameter of the edge of the smaller end of the locking surface is smaller than the inner diameter of the end port of the main body. The outer edge of the locking surface abuts against the end surface of the main body to reduce the sliding friction when the clamping ring is radially contracted, and the inner edge of the locking surface clamps the pipe fitting to improve the connection reliability.

[0011] In the above quick connector, the two edges of the locking surface are arc chamfered. The arc chamfer of the outer edge of the locking surface can reduce the friction force with the end surface of the main body, and the arc chamfer of the inner edge can avoid damaging the pipe fitting when clamping the pipe fitting.

[0012] In the quick connector, the inner circumferential surface of the outer end of the nut is provided with an annular abutting portion in the circumferential direction, the inner end surface of the abutting portion is the step surface, and the inner diameter of the abutting portion is the same as the inner diameter of the port of the main body. By abutting the snap ring, the reliability is improved, and the abutting portion can limit the pipe, thereby improving the stability.

[0013] In the quick connector, the inner circumferential surface of the abutting portion and the inner circumferential surface of the port of the main body are both provided with an inner sealing groove in the circumferential direction, and the inner sealing groove is provided with an inner sealing ring. The inner sealing ring can be tightly fitted between the outer circumferential surface of the pipe and the abutting portion and the inner circumferential surface of the main body, thereby increasing the sealing performance.

[0014] In the quick connector, the inner hole of the main body is stepped at both ends and has a limiting surface facing the port. The pipe is inserted until it abuts against the limiting surface, that is, the pipe is inserted in place, thereby facilitating the operation and ensuring the connection reliability.

[0015] In the quick connector, the outer circumferential surface of the main body is provided with an outer sealing groove in the circumferential direction at both ends, the outer sealing groove is provided with an outer sealing ring, and the inner circumferential surface of the nut abuts against the outer sealing ring. The sealing performance between the nut and the main body is increased.

[0016] Compared with the prior art, the quick connector has the following advantages:

[0017] 1. Since the larger end of the snap ring abuts against the step surface of the nut, and the smaller end of the snap ring is constrained by the end surface of the main body, the snap ring always stably clamps the pipe, and the connection reliability is high.

[0018] 2. Since the pipe only needs to be screwed after being inserted, the operation is convenient and fast.

[0019] 3. Since the inner edge and the outer edge of the smaller end of the snap ring are both provided with arc chamfers, the arc chamfer of the outer edge can reduce the friction with the end surface of the main body, and the arc chamfer of the inner edge can avoid damaging the pipe when clamping the pipe. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the structure of the quick connector.

[0021] Figure 2 is a sectional view of the structure of the quick connector.

[0022] Figure 3 is Figure 2 is an enlarged view of the structure at A in the quick connector.

[0023] In the drawings, 1 is the main body, 11 is the limiting surface, 2 is the nut, 21 is the abutting portion, 22 is the limiting portion, 23 is the step surface, 3 is the snap ring, 31 is the locking surface, 4 is the inner sealing groove, 5 is the inner sealing ring, 6 is the outer sealing groove, and 7 is the outer sealing ring. DETAILED DESCRIPTION

[0024] The utility model discloses the specific embodiment below and further describes the technical scheme of the utility model with the drawings, but the utility model is not limited to these embodiments.

[0025] As shown in Figure 1 , Figure 2 , a quick coupling, including tubular body 1 and two caps 2, two caps 2 are respectively set in the both ends of body 1, and cap 2 is connected with body 1 by screw thread, the inner hole of cap 2 is equipped with snap ring 3, snap ring 3 is circular truncated cone sheet, and the smaller end is towards body 1 end face, the inner periphery of cap 2 outer end has annular abutment portion 21 circumferentially, the inner end face of this abutment portion 21 is step face 23 towards body 1 end face, the inner diameter of abutment portion 21 is same with the inner diameter of body 1 end port. When cap 2 is screwed, step face 23 can press the larger end of snap ring 3, so that the smaller end of snap ring 3 is pressed on body 1 end face and deforms to the minimum inner diameter less than the inner diameter of body 1 end port.

[0026] Specifically, as shown in Figure 3 , the taper of snap ring 3 is equal to 45 °, of course, the taper of snap ring 3 can be greater than 45 ° in actual processing, and snap ring 3 is made of metal material and has elasticity. The step face 23 also has annular limiting portion 22 circumferentially, the limiting portion 22 surrounds the larger end of snap ring 3, and the inner edge of the larger end of snap ring 3 abuts on the step face 23, and the outer edge abuts on the inner periphery of limiting portion 22. The end face of the smaller diameter end of snap ring 3 is locking face 31, the locking face 31 is tapered, and the edge of the larger end of locking face 31 abuts on the end face of body 1, when cap 2 is locked, snap ring 3 deforms to the inner diameter of the edge of the smaller end of locking face 31 less than the inner diameter of body 1 end port. The two edges of locking face 31 are arc chamfered. The inner periphery of abutment portion 21 and the inner periphery of body 1 end port are circumferentially provided with inner sealing groove 4, and inner sealing ring 5 is arranged in inner sealing groove 4. The both ends of the inner hole of body 1 are stepped and have limiting face 11 towards the hole opening. The outer periphery of the both ends of body 1 is circumferentially provided with outer sealing groove 6, and outer sealing ring 7 is arranged in outer sealing groove 6, and the inner periphery of cap 2 abuts on outer sealing ring 7.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the utility model. The skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0028] Although the terms main body 1, limiting surface 11, nut 2 and the like are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present utility model; any kind of additional limitation resulting from the interpretation of them is contrary to the spirit of the present utility model.

Claims

1. A quick coupling comprising a tubular body (1) and two caps (2) respectively fitted on the ends of the body (1), said caps (2) being screwed to the body (1), characterized in that, The screw cap (2) is provided with a snap ring (3) in the inner hole, the snap ring (3) is in the shape of a truncated cone, and the smaller end faces the end face of the main body (1), and the inner wall of the screw cap (2) is further provided with a stepped surface (23) facing the end face of the main body (1), when the screw cap (2) is tightened, the stepped surface (23) can press the larger end of the snap ring (3), so that the smaller end of the snap ring (3) is pressed on the end face of the main body (1) and deformed to the minimum inner diameter smaller than the inner diameter of the port of the main body (1).

2. The quick coupling of claim 1, wherein, The taper of the snap ring (3) is greater than or equal to 45°.

3. The quick coupling of claim 2, wherein, The snap ring (3) is made of metal material and has elasticity.

4. Quick coupling according to claim 1 or 2 or 3, characterized in that The stepped surface (23) is further provided with an annular limiting portion (22) in the circumferential direction, the limiting portion (22) surrounds the larger end of the snap ring (3), and the inner edge of the larger end of the snap ring (3) abuts against the stepped surface (23), and the outer edge abuts against the inner circumferential surface of the limiting portion (22).

5. Quick coupling according to claim 1 or 2 or 3, characterized in that The end face of the smaller end of the snap ring (3) is a locking surface (31), the locking surface (31) is tapered, and the larger end of the locking surface (31) abuts against the end face of the main body (1), when the screw cap (2) is locked, the snap ring (3) is deformed to the inner diameter of the smaller end of the locking surface (31) smaller than the inner diameter of the port of the main body (1).

6. The quick coupling of claim 5, wherein, The two edges of the locking surface (31) are arc chamfered.

7. Quick coupling according to claim 1 or 2 or 3, characterized in that The inner circumferential surface of the outer end of the screw cap (2) is provided with an annular abutting portion (21) in the circumferential direction, the inner end face of the abutting portion (21) is the stepped surface (23), and the inner diameter of the abutting portion (21) is the same as the inner diameter of the port of the main body (1).

8. Quick coupling according to claim 7, characterized in that The inner circumferential surface of the abutting portion (21) and the inner circumferential surface of the port of the main body (1) are both provided with an inner sealing groove (4) in the circumferential direction, and the inner sealing groove (4) is provided with an inner sealing ring (5).

9. Quick coupling according to claim 1 or 2 or 3, characterized in that The two ends of the inner hole of the main body (1) are both stepped and provided with a limiting surface (11) facing the hole.

10. Quick coupling according to claim 1 or 2 or 3, characterized in that The outer circumferential surface of the two ends of the main body (1) is provided with an outer sealing groove (6) in the circumferential direction, the outer sealing groove (6) is provided with an outer sealing ring (7), and the inner circumferential surface of the screw cap (2) abuts against the outer sealing ring (7).

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