Quick connect pneumatic fitting

Abstract

The utility model discloses a kind of fast insertion pneumatic connector, its technical solution main points include inner joint, outer joint, hose, the inner joint is connected with outer joint, the hose is installed in inner joint, it is characterized by: the inner joint tail portion is equipped with auxiliary device, the connecting gap between the auxiliary device and inner joint and outer joint is connected with intercommunication;In normal state, auxiliary device hides in the interlayer formed by inner joint tail end and outer joint, can move and appear under the action of leakage airflow.The utility model is set through fender, achieves the function of converting invisible gas leakage into intuitive visual signal, realizes early discovery and early warning to leakage, effectively avoids system failure expansion and improves maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, and more specifically to a quick-connect pneumatic connector. Background Technology

[0002] Currently, pneumatic couplings are key connecting components in the fields of air piping and pneumatic tools. They typically consist of an inner coupling, an outer coupling, and a housing located outside the inner coupling and mating with it. As a coupling that can connect or disconnect pipelines without the need for tools, its core function is to deliver compressed air from an air source to pneumatic tools. It has a wide range of applications and can be matched with various pneumatic equipment such as air pipelines, air compressors, grinders, air drills, impact wrenches, and pneumatic screwdrivers.

[0003] However, the existing technologies mentioned above still have some drawbacks. Existing pneumatic connectors typically use sealing gaskets at the contact surfaces of the inner and outer connectors; however, these gaskets are prone to plastic deformation, aging, and even structural damage after prolonged exposure to high pressure. In industrial settings, pneumatic pipelines are often densely packed, and initial compressed air leaks are often small, colorless, and odorless, making them difficult to detect with the senses under low pressure. Even if a leak is detected, the large number of connectors necessitates a thorough check to pinpoint the leak, delaying repairs, causing continuous waste of compressed air and system pressure fluctuations, and potentially interfering with the normal operation of pneumatic components due to accumulated leaks, ultimately leading to equipment failure. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides a quick-connect pneumatic connector.

[0005] To achieve the above objectives, this utility model provides the following technical solution: including an inner connector, an outer connector, and a hose, wherein the inner connector is connected to the outer connector, and the hose is installed on the inner connector, characterized in that: an auxiliary device is provided at the tail end of the inner connector, and the auxiliary device is connected to the connection gap between the inner connector and the outer connector; under normal conditions, the auxiliary device is hidden in the interlayer formed by the tail end of the inner connector and the outer connector, and can move and become visible under the action of leaking airflow.

[0006] The present invention is further configured such that the auxiliary device includes a retaining ring that can slide axially relative to the inner joint.

[0007] The present invention is further configured such that the retaining ring is coated with a bright colored paint.

[0008] The present invention is further configured such that: a sealing ring for auxiliary sealing is provided on the side of the retaining ring near the connection surface between the outer connector and the inner connector.

[0009] The present invention is further configured such that: the retaining ring has a retaining protrusion with a bevel on one side, and the retaining ring has a whistle near the retaining protrusion.

[0010] The present invention is further configured such that: the outer connector is provided with a snap-fit ​​part for snapping the inner connector, the inner connector is provided with a retaining part for clamping the hose, the retaining part is provided with a plurality of elastic tongues, the snap-fit ​​part is a structure that protrudes inward, and a fixing sleeve for supporting the hose is provided inside the hose.

[0011] The present invention is further configured such that: the snap-fit ​​part has a gently sloping loading surface in the insertion direction and a steeply sloping pull-out surface in the pull-out direction; the end of the elastic tongue has a bent portion formed by bending, and the bent portion is adapted to the snap-fit ​​part.

[0012] In summary, this utility model has the following beneficial effects: 1. By setting an axially sliding retaining ring at the tail of the inner connector that communicates with the connection gap, and by setting a whistle on the retaining ring, the invisible gas leak is transformed into an intuitive visual and audible signal, realizing early dual warning of the leak, effectively preventing the system failure from escalating and improving maintenance efficiency.

[0013] 2. By combining the retaining part with the elastic tongue on the inner connector with the snap-fit ​​part with the bevel on the hose, the function of smooth snap-fit ​​during insertion and firm locking during removal is achieved, realizing reliable connection and quick insertion and removal, greatly improving the convenience of installation and maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this embodiment; Figure 2 This is a magnified view of a portion of point A in this embodiment; Figure 3 This is a magnified view of part B in this embodiment; Figure 4 This is a schematic diagram of the internal connector structure in this embodiment; Figure 5 This is a schematic diagram of the retaining ring structure in this embodiment; Figure 6 This embodiment illustrates the working state of the auxiliary device. Reference numerals: 1. Inner connector; 11. Retaining part; 111. Elastic tongue; 112. Bending part; 12. Stop protrusion; 13. Air guide groove; 2. Outer connector; 21. Snap-fit ​​part; 211. Loading surface; 212. Pull-out surface; 3. Hose; 4. Auxiliary device; 41. Retaining ring; 411. Inclined surface; 412. Snap-fit ​​protrusion; 413. Whistle; 42. Sealing ring; 5. Fixing sleeve; 6. Sealing gasket. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings.

[0016] This embodiment discloses a quick-connect pneumatic connector, such as Figure 1 As shown, the system includes an inner connector 1, an outer connector 2, and a hose 3. The inner connector 1 is connected to the outer connector 2, and the hose 3 is installed on the inner connector 1. The system is characterized by: an auxiliary device 4 at the tail end of the inner connector 1, which communicates with the connection gap between the inner connector 1 and the outer connector 2; and several air guide grooves 13 in the middle section of the inner connector 1, which guide airflow and ensure that leaking airflow flows evenly to the auxiliary device 4. Under normal conditions, the auxiliary device 4 is hidden within the interlayer formed by the tail end of the inner connector 1 and the outer connector 2, but can move and become visible under the influence of leaking airflow. The auxiliary device 4 provides proactive and intuitive visual indication of leaks, allowing maintenance and operation personnel to visually identify the leak location in its early stages without the need for soapy water, listening rods, or specialized detection instruments. This allows for timely intervention before the leak causes a significant drop in system pressure, abnormal actuator operation, or production disruption, preventing the escalation of the problem.

[0017] like Figure 2 As shown, the auxiliary device 4 includes a retaining ring 41 that can slide axially relative to the inner connector 1. The retaining ring 41 is designed to utilize the energy of the leaking gas itself. When a leak occurs, the leaked high-pressure gas enters the gap between the inner connector 1 and the outer connector 2 and acts on the surface of the retaining ring 41 near the connection surface between the inner and outer connector 2, causing the retaining ring 41 to be subjected to an outward thrust, pushing it to slide axially, thereby converting the invisible "gas leak" into a visible "mechanical displacement".

[0018] Furthermore, the retaining ring 41 is coated with a bright, eye-catching paint. In this embodiment, red is preferred. The bright color contrasts sharply with the color of the connector body, presenting a very conspicuous indication. It can be easily spotted even in poorly lit industrial environments, improving the effectiveness of the warning function. Operators and maintenance personnel can understand that "seeing a bright color indicates a leak" without training, making it intuitive and easy to understand.

[0019] To further improve the system, a sealing ring 42 for auxiliary sealing is provided on the side of the retaining ring 41 near the connection surface between the outer connector 2 and the inner connector 1. The sealing ring 42 can serve as a second barrier, preventing or reducing gas leakage to a certain extent and improving the system's safety redundancy.

[0020] like Figure 5As shown, the retaining ring 41 has a retaining protrusion 412 with a bevel on one side, and a whistle 413 is provided near the retaining ring 412. The bevel 411 and the retaining protrusion 412 provide a receiving space for the sealing ring 42. When the leaking gas pushes the sealing ring 42 outward, the sealing ring 42 will move along the bevel 411, so that part of the sealing ring 42 will move to the upper side of the retaining protrusion 412 and contact the inner surface of the outer connector 2. Once the retaining ring 41 pops out, it will not easily retract even if the leakage stops, and it needs to be manually reset to maintain the leakage warning state and prevent the warning from being missed due to intermittent leakage. The retaining ring 41 has a whistle 413 near the retaining protrusion 412. The setting of the whistle 413 allows the retaining ring 41 to have a certain elastic deformation, enabling it to expand to a certain extent. The retaining ring 41 can also be easily and conveniently installed into the inner connector 1. When the sealing ring 42 is pushed onto the inclined surface 411 by air pressure, a leakage gap will be formed at the inclined surface 411. This leakage gap, together with the whistle 413, will form a sound outlet for exhaust. The leaking high-pressure gas will emit a clear whistle as a warning when passing through this exhaust channel.

[0021] like Figure 3 As shown, the fixing structure includes a retaining part 11 and a locking part 21 respectively disposed on the inner connector 1 and the outer connector 2. The retaining part 11 is provided with a plurality of elastic tongues 111, and the locking part 21 has an inward locking protrusion 412. The elastic tongues 111 and the locking part 21 with the inward locking protrusion 412 form a tight mechanical interlock, which can resist the dislodgement force of the hose 3 under pressure and ensure the reliability of the connection.

[0022] like Figure 4 As shown, the snap-fit ​​part 21 has a gently sloping loading surface 211 in the insertion direction and a steeply sloping pull-out surface 212 in the pull-out direction. The relatively gentle loading surface 211 reduces the resistance encountered when the inner connector 1 is inserted into the outer connector 2. The steep pull-out surface 212 requires greater force when pulling out, achieving quick and easy insertion and removal while ensuring a firm connection and preventing accidental detachment. The end of the elastic tongue 111 has a bend-formed protrusion. This bend shape is adapted to the snap-fit ​​part 21, ensuring a larger contact area with the snap-fit ​​part 21 of the hose 3, more even force distribution, and a more stable connection. At the same time, the bend 112 provides a clearer "click" sound and feel when inserting and removing, allowing the operator to clearly perceive whether the connection is in place. The inner connector 1 is provided with a stop protrusion 12. The stop protrusion 12 is provided so that when unlocking, the inner connector 1 can be pushed to slide inward relative to the hose 3, so that the bent part can be disengaged from the snap-fit ​​part 21, and the hose 3 can be easily and conveniently pulled out from the inner connector 1. At the same time, the stop protrusion 12 can limit the maximum movement distance of the retaining ring 41 to prevent the retaining ring 41 from accidentally falling off.

[0023] Working principle of this utility model During assembly, the sealing ring 42 is placed on the inner connector 1, and the retaining ring 41 is placed on the inner connector 1. The hose 3 is inserted from the rear side of the inner connector 1, passes through the inner connector 1 and extends out from the retaining part 11. The fixing sleeve 5 is inserted into the opening of the hose 3 so that the fixing sleeve 5 can provide support. The elastic force of the retaining part 11 and the supporting force of the fixing sleeve 5 work together to form a small clamp on the hose 3. The assembled inner connector 1 is inserted into the outer connector 2 and a "click" is heard. The inner connector 1 and the outer connector 2 are engaged, forming a good installation.

[0024] During disassembly, push the inner connector 1 to move it inward, and the hose 3 can be easily pulled out. The inner connector 1 and the outer connector 2 can be easily detached, thus completing the disassembly.

[0025] When a leak occurs, refer to Figure 6 High-pressure gas escapes from the leak point and enters the gap cavity at the connection between the inner connector 1 and the outer connector 2. The pressure generated by the leaking gas acts on the sealing ring 42. The sealing ring 42 closely adheres to the back of the retaining ring 41 and transmits the gas pressure to the retaining ring 41. When the gas pressure is sufficient to overcome the friction of the auxiliary sealing ring 42 and the frictional resistance of the retaining ring 41, it pushes the retaining ring 41 to slide outward along the axial direction of the inner connector 1. After the retaining ring 41 is pushed out, it will always remain in the exposed position, providing a continuous visual warning. At the same time, the leaking gas will emit a whistle through the sound outlet formed by the whistle 413 and the sealing ring 42, providing a clear audible prompt.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick-connect pneumatic connector, comprising an inner connector (1), an outer connector (2), and a flexible hose (3), wherein the inner connector (1) is connected to the outer connector (2), and the flexible hose (3) is installed on the inner connector (1), characterized in that: The inner connector (1) is provided with an auxiliary device (4) at its tail end. The auxiliary device (4) is connected to the connection gap between the inner connector (1) and the outer connector (2). Under normal conditions, the auxiliary device (4) is hidden in the interlayer formed by the tail end of the inner connector (1) and the outer connector (2), and can move and become visible under the action of the leaking airflow.

2. The quick-connect pneumatic connector according to claim 1, characterized in that: The auxiliary device (4) includes a retaining ring (41) that can slide axially relative to the inner joint (1).

3. A quick-connect pneumatic connector according to claim 2, characterized in that: The retaining ring (41) is coated with a bright colored paint.

4. A quick-connect pneumatic connector according to claim 2, characterized in that: The retaining ring (41) is provided with a sealing ring (42) for auxiliary sealing on the side near the connection surface between the outer connector (2) and the inner connector (1).

5. A quick-connect pneumatic connector according to claim 2, characterized in that: The retaining ring (41) has a locking protrusion (412) with a bevel (411) on one side, and the retaining ring (41) has a whistle (413) near the locking protrusion (412).

6. A quick-connect pneumatic connector according to claim 1, characterized in that: The outer connector (2) is provided with a snap-fit ​​part (21) for snapping the inner connector (1), the inner connector (1) is provided with a retaining part (11) for clamping the hose (3), the retaining part (11) is provided with a plurality of elastic tongues (111), the snap-fit ​​part (21) is a structure that protrudes inward, and the hose (3) is provided with a fixing sleeve (5) for supporting the hose (3).

7. A quick-connect pneumatic connector according to claim 6, characterized in that: The snap-fit ​​part (21) has a gently sloping loading surface (211) in the insertion direction and a steep pulling surface (212) in the pulling-out direction; the end of the elastic tongue (111) has a bent part (112) formed by bending, and the bent part (112) is adapted to the snap-fit ​​part (21).

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