Quick connector

Abstract

The utility model provides a quick connector, and belongs to the technical field of machinery. The quick connector solves the problem that a quick connector cannot be used due to the fact that a lining pipe and a clamping ring are locked mutually easily. The connector comprises a connector body, a clamping ring and a lining pipe, the clamping ring and the lining pipe are arranged in an inserting end of the connector body, a buckle positioning cap is clamped and fixed to an end opening of the inserting end, an annular abutting seat for the outer edge of the clamping ring to abut against is arranged in the inserting end, an annular positioning seat is arranged between the clamping ring and the buckle positioning cap in the inserting end, and a limiting ring is arranged in the inserting end. Two hanging lugs are arranged at the outer end of the limiting ring in a protruding mode in the circumferential direction, the hanging lugs abut against the annular positioning base, the clamping ring is limited to the annular abutting base through the inner end of the limiting ring, the hanging lugs are limited to the annular positioning base through the buckle positioning cap, the inner end of the lining pipe penetrates through the limiting ring, and an annular blocking part is arranged on the peripheral side of the lining pipe. The lining pipe can move inwards till the blocking part abuts against the outer end face of the limiting ring. The device has the advantages of being capable of effectively preventing the lining pipe and the clamping ring from being locked and the like.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to quick couplings. Background Technology

[0002] For water, gas, oil and other pipeline connections, joints are often used. When using traditional pipe joints to connect to pipelines, the connection is usually made by threading, glue or heat fusion, but these connection methods are relatively troublesome and slow. Therefore, quick connectors, such as the one described in patent application number 201620591517.7, have been designed for use. These connectors include a connector body, one end of which is a plug-in end. The plug-in end contains a retaining ring and an inner liner. A locking cap is connected to the port of the plug-in end, confining the retaining ring and inner liner within the plug-in end. The outer end of the inner liner passes through the center of the locking cap. The inner end of the locking cap has a ring-shaped protruding connecting block. The connecting block extends into the plug-in end, and a locking structure is provided between the outer wall of the connecting block and the inner wall of the plug-in end, allowing the connecting block to engage within the plug-in end. The locking structure includes an annular groove on the inner wall of the plug-in end and a block-shaped protruding locking portion on the outer side of the locking cap's connecting block. The locking portion on the connecting block engages in the annular groove. Alternatively, the locking structure includes a ring-shaped protruding locking block on the inner side of the plug-in end and an annular connecting groove on the outer side of the connecting block. The locking block engages in the connecting groove. When in use, the pipe is passed through the inner liner and inserted into the plug end of the connector body. When the pipe passes through the retaining ring, the retaining teeth on the retaining ring will engage with the outer wall of the pipe to form a quick connection. When disassembling, simply push the inner liner inward to open the retaining teeth of the retaining ring to separate the retaining ring from the pipe.

[0003] As shown in the attached diagram, the inner end of the inner liner tube has an annular shoulder on its outer side, and the inner end of the locking cap has an annular retaining edge. The annular shoulder and the annular retaining edge abut against each other, preventing the inner liner tube from being pulled out of the locking cap when it moves towards the outside of the insertion end. At the same time, the movement of the inner liner tube towards the inside of the insertion end is not restricted. Although this is designed to allow the retaining ring to disengage from the fitting when the inner liner tube is pushed inward, in actual use, if too much force is applied, the inner liner tube may be pushed in excessively and pass directly through the retaining ring. In this case, the teeth on the outside of the retaining ring will bite directly onto the outside of the inner liner tube, causing the retaining ring and the inner liner tube to lock together and rendering the quick coupling unusable. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a quick connector that solves the problem of the inner liner tube and the retaining ring easily locking together, rendering the quick connector unusable.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A quick connector includes a connector body with a plug-in end, a retaining ring and an inner liner tube disposed within the plug-in end, wherein a snap-fit ​​positioning cap is snapped and fixed at the port of the plug-in end, and the outer end of the inner liner tube protrudes from the plug-in end through the snap-fit ​​positioning cap. The plug-in end is characterized by having an annular abutment seat for the outer edge of the retaining ring to abut against, an annular positioning seat between the retaining ring and the snap-fit ​​positioning cap, and a limiting ring within the plug-in end. Two lugs protrude circumferentially from the outer end of the limiting ring, each lug abutting against the annular positioning seat. The inner end of the limiting ring limits the retaining ring to the annular abutment seat, and the snap-fit ​​positioning cap limits each lug to the annular positioning seat. The inner end of the inner liner tube passes through the limiting ring, and an annular blocking portion is provided on the outer periphery of the inner liner tube, allowing the inner liner tube to move inward until the blocking portion abuts against the outer end face of the limiting ring.

[0007] During installation, first insert the retaining ring into the plug end and let its outer edge abut against the annular abutment seat. Then, insert the limiting ring into the plug end and let its outer lugs abut against the annular positioning seat. Finally, put the buckle positioning cap on the outside of the inner liner tube and snap the buckle positioning cap into the port of the plug end. After installation, the inner end of the inner liner abuts against the teeth on the inner side of the retaining ring. The inner end of the snap-locking cap limits each lug to the annular positioning seat, thus limiting the position of the retaining ring along the axial direction of the insertion end. The limiting ring's position also limits the position of the retaining ring along the axial direction of the insertion end. The outer circumference of the inner liner is provided with an annular blocking part. The inner liner can move inward until the blocking part abuts against the outer end face of the retaining ring. This is equivalent to using the retaining ring to constrain the maximum distance that the inner liner can move inward, ensuring that the inner liner can open the teeth on the retaining ring without moving excessively and directly passing through the retaining ring. This avoids the situation where the inner liner and the retaining ring lock together, making the quick connector unusable.

[0008] The limiting ring serves as both a constraint retaining ring and an inner liner tube, achieving dual functionality while improving reliability and making the rapid structure more compact.

[0009] In the aforementioned quick connector, the inner side of the plug end has an annular shoulder, the outer side of the snap-fit ​​positioning cap has a snap-fit ​​groove, the annular shoulder is snapped into the snap-fit ​​groove, the lug is arc-shaped and the lug is concentric with the limiting ring, the two lugs are symmetrically arranged and the arc of the lug is less than 90°.

[0010] Due to the presence of the annular shoulder, the limiting ring cannot be directly inserted into the connector in a flat manner (the lugs would inevitably interfere with the annular shoulder). Therefore, the lugs are designed to be arc-shaped and concentric with the limiting ring, with the two lugs symmetrically arranged and the arc of the lugs less than 90°. This allows the limiting ring to be installed into the connector by passing it obliquely through the annular shoulder and then flattening it.

[0011] In the aforementioned quick connector, the limiting ring is made of nylon.

[0012] Nylon material has a certain deformation capacity. During the installation process of passing the limiting ring obliquely through the annular shoulder and then laying it flat, this deformation capacity can be used to provide certain convenience, making it easier to insert into the plug end.

[0013] In the aforementioned quick connector, there is a gap between the limiting ring and the opposite side of the retaining ring.

[0014] By setting a gap between the opposing sides of the limiting ring and the retaining ring instead of direct contact, the limiting effect on the retaining ring is not affected (the retaining ring has only a very small amount of movement), while allowing the retaining ring to remain suspended to prevent the fitting from coming out of the connector during rotation. If the limiting ring is used to directly press the retaining ring onto the annular abutment, after the retaining ring's teeth engage with the outer wall of the fitting, if the fitting rotates, it is easy for the fitting to come out directly relative to the retaining ring, similar to a threaded structure.

[0015] In the aforementioned quick connector, the snap-fit ​​positioning cap includes a circular ring and an annular protrusion integrally fixed to the inner side of the circular ring. The side of the annular protrusion is provided with several notches along the circumferential direction. The annular protrusion between two adjacent notches is plate-shaped, and the outer side of the inner end of the annular protrusion between two adjacent notches is provided with a raised edge. The snap-fit ​​groove is formed between the raised edge and the inner side of the circular ring. The outer end of the inner liner tube passes through the central hole of the circular ring.

[0016] In the aforementioned quick connector, the central aperture of the annular body is smaller than the inner diameter of the annular protrusion, the blocking part is located inside the annular protrusion, and the outer diameter of the blocking part is larger than the central aperture of the annular body.

[0017] With the above configuration, the blocking part can not only limit the maximum inward movement distance of the inner liner tube by cooperating with the limiting ring, but also cooperate with the inner side of the ring of the snap-on positioning cap to prevent the inner liner tube from coming out directly from the insertion end, thus further improving the compactness of the structure.

[0018] Compared with existing technologies, this quick connector features an annular positioning seat and a limiting ring inside the plug-in end. The lugs of the limiting ring abut against the annular positioning seat, and the inner end of the snap-fit ​​positioning cap limits each lug to the annular positioning seat, thus limiting the axial position of the limiting ring along the plug-in end. This limiting position also limits the axial position of the retaining ring. Furthermore, an annular blocking part is provided on the outer periphery of the inner liner. The inner liner can move inward until the blocking part abuts against the outer end face of the limiting ring. This effectively constrains the maximum inward movement of the inner liner using the limiting ring, ensuring that the inner liner can open the retaining teeth on the retaining ring without excessive movement and directly passing through the retaining ring. This prevents the inner liner and retaining ring from locking together, rendering the quick connector unusable. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the quick connector.

[0020] Figure 2 This is a planar schematic diagram of the limiting ring.

[0021] Figure 3 This is a 3D schematic diagram of the snap-on positioning cap.

[0022] In the figure, 1. Connector body; 1a. Insertion end; 1a1. Annular shoulder; 1a2. Annular abutment; 1a3. Annular positioning seat; 1a4. Annular groove; 1b. Annular partition; 2. Snap ring; 2a. Snap tooth; 3. Inner liner tube; 3a. Blocking part; 4. Snap positioning cap; 4a. Snap groove; 4b. Ring body; 4c. Annular protrusion; 4c1. Protruding edge; 4d. Notch; 5. Limiting ring; 5a. Lug; 6. Sealing ring. Detailed Implementation

[0023] 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.

[0024] like Figure 1 and Figure 2As shown, the quick connector includes a connector body 1 with one end being a plug-in end 1a, a retaining ring 2 and an inner liner 3 disposed within the plug-in end 1a, a snap-fit ​​positioning cap 4 being snapped and fixed at the port of the plug-in end 1a, and the outer end of the inner liner 3 passing through the snap-fit ​​positioning cap 4 and extending out of the plug-in end 1a. The inner side of the port of the plug-in end 1a has an annular shoulder 1a1, the snap-fit ​​positioning cap 4 is a plastic part, and the outer side of the snap-fit ​​positioning cap 4 has a snap-fit ​​groove 4a, in which the annular shoulder 1a1 is snapped. The insertion end 1a has an annular abutment seat 1a2 for the outer edge of the retaining ring 2 to abut against. The insertion end 1a has an annular positioning seat 1a3 between the retaining ring 2 and the snap positioning cap 4. The insertion end 1a is provided with a limiting ring 5. The outer end of the limiting ring 5 is provided with two hanging ears 5a protruding circumferentially. Each hanging ear 5a abuts against the annular positioning seat 1a3. The inner end of the limiting ring 5 limits the retaining ring 2 at the annular abutment seat 1a2 and the snap positioning cap 4 limits each hanging ear 5a at the annular positioning seat 1a3. The inner end of the inner liner tube 3 passes through the limiting ring 5. The outer periphery of the inner liner tube 3 is provided with an annular blocking part 3a. The inner liner tube 3 can move inward until the blocking part 3a abuts against the outer end face of the limiting ring 5. In this embodiment, there is a gap between the limiting ring 5 and the opposite side of the retaining ring 2. This gap allows the retaining ring 2 to be suspended, i.e., not pressed against the annular abutment 1a2, so that it will not disengage from the retaining ring 2 when the pipe rotates. The limiting ring 5 is made of nylon, and the lugs 5a are arc-shaped and concentrically positioned with the limiting ring 5. The two lugs 5a are symmetrically positioned, and their curvature is less than 90°. Due to the presence of the annular shoulder 1a1, the limiting ring 5 cannot be directly inserted into the plug-in end 1a in a flat manner (the lugs 5a would inevitably interfere with the annular shoulder 1a1). Therefore, the lugs 5a are arc-shaped and concentrically positioned with the limiting ring 5, with the two lugs 5a symmetrically positioned and their curvature less than 90°. This allows the limiting ring 5 to be installed into the plug-in end 1a by passing diagonally through the annular shoulder 1a1 and then flattening it during installation.

[0025] Furthermore, such as Figure 1 As shown, the plug end 1a is also provided with an annular groove 1a4, and an annular abutment 1a2 is located between the annular groove 1a4 and the annular positioning seat 1a3. A sealing ring 6 is provided in the annular groove 1a4. Furthermore, the connector body 1 is a straight pipe type, and both ends of the connector body 1 are plug ends 1a, and the structures inside these two ends are the same.

[0026] In this embodiment, as Figure 1 and Figure 3As shown, the snap-fit ​​positioning cap 4 includes a ring body 4b and an annular protrusion 4c integrally fixed to the inner side of the ring body 4b. The side of the annular protrusion 4c is provided with several notches 4d along the circumferential direction. The annular protrusion 4c between two adjacent notches 4d is plate-shaped, and the outer side of the inner end of the annular protrusion 4c between two adjacent notches 4d is provided with a protruding edge 4d1. The snap-fit ​​groove 4a is formed by the protruding edge 4d1 and the inner side of the ring body 4b. The outer end of the inner liner tube 3 passes through the central hole of the ring body 4b. The central aperture of the annular body 4b is smaller than the inner diameter of the annular protrusion 4c. The blocking part 3a is located inside the annular protrusion 4c, and the outer diameter of the blocking part 3a is larger than the central aperture of the annular body 4b. Through the above arrangement, the blocking part 3a can not only limit the maximum inward movement distance of the inner liner tube 3 by cooperating with the limiting ring 5, but also cooperate with the inner side of the annular body 4b of the snap-fit ​​positioning cap 4 to prevent the inner liner tube 3 from directly coming out of the insertion end 1a, further improving the compactness of the structure.

[0027] In use, the pipe to be connected is inserted into the plug end 1a through the inner liner tube 3. The pipe passes through the retaining ring 2, and the retaining teeth 2a on the retaining ring 2 are opened. At this time, the retaining teeth 2a will bite into the outer wall of the pipe, thus forming a quick connection. When disassembly is required, simply push the inner liner tube 3 into the plug end 1a. The inner end of the inner liner tube 3 will open the retaining teeth 2a of the retaining ring 2, causing it to disengage from the pipe.

[0028] When installing this quick connector, first insert the retaining ring 2 into the plug end 1a and let its outer edge abut against the annular abutment seat 1a2. Then, insert the limiting ring 5 into the plug end 1a and let each of its outer lugs 5a abut against the annular positioning seat 1a3. Then, put the snap-on positioning cap 4 over the inner liner tube 3 and snap-on the snap-on positioning cap 4 into the port of the plug end 1a. After installation, the inner end of the inner liner tube 3 abuts against the teeth 2a on the inner side of the retaining ring 2. The inner end of the buckle positioning cap 4 limits each lug 5a to the annular positioning seat 1a3, thus limiting the position of the limiting ring 5 along the axial direction of the insertion end 1a. The limiting ring 5 is thus limited, which means that it also limits the position of the retaining ring 2 along the axial direction of the insertion end 1a. The outer circumference of the inner liner tube 3 is provided with an annular blocking part 3a. The inner liner tube 3 can move inward until the blocking part 3a abuts against the outer end face of the limiting ring 5. This is equivalent to using the limiting ring 5 to constrain the maximum distance that the inner liner tube 3 can move inward, ensuring that the inner liner tube 3 can open each tooth 2a on the retaining ring 2 without moving excessively and directly passing through the retaining ring 2. This avoids the situation where the inner liner tube 3 and the retaining ring 2 lock together, making the quick connector unusable.

[0029] 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.

Claims

1. A quick connector, comprising a connector body (1) having a plug-in end (1a) at one end, a retaining ring (2) and an inner liner (3) disposed within the plug-in end (1a), wherein a snap-fit ​​positioning cap (4) is snap-fitted and fixed at the port of the plug-in end (1a), and the outer end of the inner liner (3) extends through the snap-fit ​​positioning cap (4) from the plug-in end (1a), characterized in that, The insertion end (1a) has an annular abutment seat (1a2) for the outer edge of the retaining ring (2) to abut against. The insertion end (1a) has an annular positioning seat (1a3) between the retaining ring (2) and the buckle positioning cap (4). The insertion end (1a) is provided with a limiting ring (5). The outer end of the limiting ring (5) has two hanging ears (5a) protruding circumferentially, and each hanging ear (5a) abuts against the annular positioning seat (1a3). The inner end of the limiting ring (5) limits the retaining ring (2) to the annular abutment seat (1a2), and the snap positioning cap (4) limits each hanging ear (5a) to the annular positioning seat (1a3). The inner end of the inner liner tube (3) passes through the limiting ring (5). The outer periphery of the inner liner tube (3) is provided with an annular blocking part (3a). The inner liner tube (3) can move inward until the blocking part (3a) abuts against the outer end face of the limiting ring (5).

2. The quick connector according to claim 1, characterized in that, The inner side of the plug end (1a) has an annular shoulder (1a1), and the outer side of the snap-fit ​​positioning cap (4) has a snap-fit ​​groove (4a). The annular shoulder (1a1) is snapped into the snap-fit ​​groove (4a). The hanging ear (5a) is arc-shaped and the hanging ear (5a) is concentric with the limiting ring (5). The two hanging ears (5a) are symmetrically arranged and the arc of the hanging ear (5a) is less than 90°.

3. The quick connector according to claim 2, characterized in that, The limiting ring (5) is made of nylon.

4. The quick connector according to claim 3, characterized in that, There is a gap between the limiting ring (5) and the opposite side of the retaining ring (2).

5. The quick connector according to claim 2, 3, or 4, characterized in that, The buckle positioning cap (4) includes a ring body (4b) and an annular protrusion (4c) integrally fixed to the inner side of the ring body (4b). The side of the annular protrusion (4c) is provided with several notches (4d) along the circumferential direction. The annular protrusion (4c) between two adjacent notches (4d) is plate-shaped and the outer side of the inner end of the annular protrusion (4c) between two adjacent notches (4d) is provided with a protruding edge (4c1). The snap-fit ​​groove (4a) is formed between the protruding edge (4c1) and the inner side of the ring body (4b). The outer end of the inner liner tube (3) passes through the central hole of the ring body (4b).

6. The quick connector according to claim 5, characterized in that, The central aperture of the annular body (4b) is smaller than the inner diameter of the annular protrusion (4c), the blocking part (3a) is located inside the annular protrusion (4c), and the outer diameter of the blocking part (3a) is larger than the central aperture of the annular body (4b).

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