A quick self-locking plug device

Abstract

The utility model discloses a quick self -locking plug device, be applicable to the interface that export end outer wall has the reverse buckle structure in circumference distribution, plug device includes: valve seat, first spring, washer, valve body, second spring, sliding block and ball bead, valve seat and valve body detachable connection, valve body is hollow structure, and its inside and outside are equipped with the ladder structure, and the wall portion in circumference of valve body is distributed with several through -holes, and first spring and washer are contained in the valve body, and first spring one end and valve seat are abutted, and the other end and washer are abutted, and washer is annular structure, and its inner diameter is configured as: allow the pipe body part of interface to pass, but prevent annular reverse buckle structure on it to pass, and the number of ball bead is multiple, and one -to -one correspondence moves and is embedded in each through -hole of valve body, and sliding block is sleeved in the outside of valve body, and the both ends of second spring are respectively with valve body and sliding block abutted, to make sliding block can along valve body outer wall axial sliding. The device whole structure of the utility model is compact, and is convenient for integrated to automatic detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing detection equipment, and more specifically, relates to a quick self-locking plug device. Background Art

[0002] During the production and manufacturing, installation and commissioning, and daily maintenance processes of fluid valves and pipelines, sealing performance is one of the core indicators for measuring their quality and safety. If the sealing effect fails to meet the standards, fluid leakage is prone to occur, which will not only cause raw material waste and environmental pollution, but also may lead to serious consequences such as equipment failures and work safety accidents. Therefore, it is necessary to verify the sealing performance of fluid valves and pipelines through professional testing means, and in the testing process, reliable sealing of the fluid valve outlet or pipeline outlet is a key prerequisite for ensuring testing accuracy. The current mainstream sealing test process in the industry is: first seal the fluid valve outlet or pipeline outlet, then feed gas with a preset pressure into the sealed fluid valve and pipeline, then place the whole into water, and judge the sealing effect by observing whether bubbles are generated in the water. If no water column bubbles are generated, it indicates that the sealing performance is qualified; if bubbles appear, it indicates that there is a sealing defect. However, with the continuous improvement of production automation and detection efficiency requirements, traditional sealing methods have shown obvious limitations in operation convenience, detection efficiency and consistency, and are difficult to meet the modern production and detection requirements of high rhythm and high precision.

[0003] For the sealing needs of fluid valves and pipeline outlets, existing technologies mainly employ manual mechanical sealing methods, which can be divided into two categories: one is the use of general-purpose threaded plugs. These plugs achieve threaded connection sealing by engaging the external thread with the internal thread of the fluid valve outlet or pipeline outlet. During operation, tools such as screwdrivers and wrenches are required to screw the plug into the outlet threaded hole until the preset sealing pressure is reached. The other type uses elastic sealing plugs. These plugs are usually made of elastic materials such as rubber and silicone. External force is applied manually to squeeze the sealing plug into the outlet channel, and the seal is achieved by the interference fit between the elastic material and the inner wall of the channel. Some elastic sealing plugs are also equipped with a manual press-type locking structure to enhance the sealing stability. To improve the ease of sealing operations, existing technologies have made partial improvements to the aforementioned plug structure: for example, adding hexagonal or cross-shaped grooves to the end of the threaded plug to accommodate commonly used screwdrivers or wrenches, reducing the frequency of tool changes; and setting an annular sealing protrusion on the outside of the elastic sealing plug to increase the contact area with the inner wall of the outlet channel, improving sealing reliability. Furthermore, some existing technologies have attempted to adopt a combined sealing structure, combining threaded connection and elastic sealing, and setting an elastic sealing ring at the sealing end of the threaded plug. When the threads are tightened, the sealing ring is compressed and deformed, further filling the thread gap and enhancing the sealing effect. Overall, the core idea of ​​existing technologies is to improve the sealing performance and ease of operation within the framework of manual operation by optimizing the mechanical structure or sealing material of the plug, in order to meet the basic requirements of sealing testing.

[0004] Although existing technologies have improved the sealing effect to some extent through structural modifications, they still have a series of inherent defects that prevent them from fundamentally solving the efficiency and quality problems of fluid valve and pipeline sealing tests. For example, most traditional plugs rely entirely on manual operation and cannot be automated, resulting in extremely low testing efficiency. Secondly, the installation process of existing devices is highly dependent on manual operation. Operators need to manually align the plug with the outlet end and control the applied torque or pressure based on experience, which can easily lead to unstable sealing effects and affect the accuracy of the test. In addition, many existing plug devices do not fully consider and utilize the existing standard connector structures (such as quick-connect fittings, compression fittings, etc.) on fluid valves and pipelines. Instead, they use independent sealing methods that are incompatible with the original component interfaces, which requires the design of additional special plugs, increases equipment costs and management complexity, and fails to take advantage of the existing interfaces in terms of quick connection. Utility Model Content

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this utility model provides a quick self-locking plug device. Through structural optimization, the interface sealing process can be completed without the need for external tools such as screwdrivers, simply by inserting and removing the plug. This greatly simplifies the operation process and significantly improves the testing cycle time and efficiency. Simultaneously, the self-locking structure ensures connection stability and repeatability, reducing reliance on operator experience and preventing seal failure or component damage caused by uneven manual force. Furthermore, the device fully utilizes the existing overlock structure on the interface to achieve rapid matching with standard connectors without additional processing or special clamps, improving versatility and adaptability.

[0006] To achieve the above objectives, this utility model provides a quick self-locking plug device, suitable for interfaces with annular inverted structures distributed circumferentially on the outer wall of the outlet end. The plug device includes: a valve seat, a first spring, a washer, a valve body, a second spring, a slider, and a ball. The valve seat is detachably connected to the valve body; The valve body is a hollow structure with stepped structures on both its inner and outer sides; several through holes are distributed on the circumferential wall of the valve body. The first spring and the washer are housed in the valve body, with one end of the first spring abutting against the valve seat and the other end abutting against the washer; The gasket is an annular structure, and its inner diameter is configured to allow the tube portion of the interface to pass through, but prevent the annular undercut structure thereon from passing through. The number of balls is multiple, and they are movably embedded in each of the through holes of the valve body in a one-to-one correspondence; The slider is sleeved on the outside of the valve body, and the two ends of the second spring abut against the valve body and the slider respectively, so that the slider can slide axially along the outer wall of the valve body; The slider has a first position and a second position: when the slider is in the first position under the action of the second spring, its inner wall presses the ball ball to move towards the central axis of the valve body to form a limiting structure for locking the external interface; when the slider is in the second position, its inner wall releases the pressure on the ball ball.

[0007] Furthermore, the valve seat and the valve body are connected by a thread, and a first sealing ring is provided at the threaded connection.

[0008] Furthermore, an annular groove is provided on the outer side wall of the end of the valve body for inserting into the external interface, and the axial distance from the annular groove to the end face of the valve body is less than the axial distance from the center of the ball to the end face of the valve body.

[0009] Furthermore, a retaining ring is embedded in the annular groove, and a portion of the retaining ring structure is exposed outside the annular groove.

[0010] Furthermore, the slider has a matching annular groove on the side facing the retaining ring.

[0011] Furthermore, the slider has knurling on its outer circumferential side.

[0012] Furthermore, the stepped structure inside the valve body includes a connected inner first section and an inner second section, wherein the diameter of the inner first section is larger than the diameter of the inner second section; The stepped structure on the outside of the valve body includes a connected outer first section and an outer second section, wherein the diameter of the outer first section is larger than the diameter of the outer second section; Furthermore, the step surface between the outer first segment and the outer second segment is closer to the valve seat than the step surface between the inner first segment and the inner second segment.

[0013] Furthermore, the plug device also includes a second sealing ring, which is disposed in the inner first section and located between the gasket and the inner second section, with its two sides abutting against the stepped surface between the inner first section and the inner second section and the gasket, respectively.

[0014] Furthermore, the outer side of the washer makes sliding contact with the inner wall of the first inner segment; The washer has an inverted snap structure on the side facing the second sealing ring.

[0015] Furthermore, the slider is provided with a matching annular groove on the side facing the second spring.

[0016] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects: 1. The plugging device of this utility model, through structural optimization, eliminates the need for external tools such as screwdrivers during the interface sealing process. Installation and disassembly can be completed solely through insertion and removal, greatly simplifying the operation process and significantly improving the testing cycle and efficiency. At the same time, the self-locking structure ensures the stability of the connection and the repeatability of the positioning accuracy, reducing reliance on the operator's experience and avoiding sealing failure or component damage caused by uneven manual force. In addition, the device makes full use of the original overlock structure on the interface to achieve rapid matching with standard connectors without additional processing or special clamps, improving versatility and adaptability.

[0017] 2. The plug device of this utility model, by setting a stepped structure on the outer and inner sides of the valve body, realizes the layered layout and precise positioning of the internal first spring and washer and the external slider and second spring, effectively avoids component interference, ensures the stability of the ball in radial movement, and at the same time improves the compactness and assembly reliability of the overall structure, providing precise mechanical guidance and support for the self-locking function.

[0018] 3. The plugging device of this utility model effectively blocks the leakage path by setting multiple sealing rings in the valve body and valve seat, significantly improving the airtightness of the plugging device and ensuring stable transmission of gas pressure and reliable sealing during the test. Attached Figure Description

[0019] Figure 1 This is an exploded view of the plug device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the plug device after it is inserted into the interface according to an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-valve seat, 2-first sealing ring, 3-first spring, 4-washer, 5-second sealing ring, 6-valve body, 7-second spring, 8-slider, 9-ball, 10-retaining ring, 11-connector. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Please refer to the figure. This utility model provides a quick self-locking plug device, which is suitable for an interface 11 with a snap-lock structure distributed circumferentially on the outer wall of the outlet end; the plug device includes: valve seat 1, first spring 3, washer 4, valve body 6, second spring 7, slider 8 and ball 9. The valve seat 1 is detachably connected to the valve body 6; The valve body 6 has a hollow structure, with stepped structures on both its inner and outer sides; several through holes are distributed on the circumferential wall of the valve body 6. The first spring 3 and the washer 4 are housed within the valve body 6. One end of the first spring 3 abuts against the valve seat 1, and the other end abuts against the washer 4. The washer 4 is an annular structure, and its inner diameter is configured to allow the tube portion of the interface 11 to pass through, but prevent the annular undercut structure on it from passing through. The number of the ball beads 9 is multiple, and they are movably embedded in each of the through holes of the valve body 6 in a one-to-one correspondence; The slider 8 is sleeved on the outside of the valve body 6, and the two ends of the second spring 7 abut against the valve body 6 and the slider 8 respectively, so that the slider 8 can slide axially along the outer wall of the valve body 6; The slider 8 has a first position and a second position: when the slider 8 is in the first position under the action of the second spring 7, its inner wall presses the ball 9 to move towards the central axis of the valve body 6 to form a limiting structure for locking the external interface 11; when the slider 8 is in the second position, its inner wall releases the pressure on the ball 9.

[0023] Understandably, during use, the valve seat 1 and the valve body 6 are connected in a detachable manner for easy maintenance and replacement. The valve body 6 is a hollow structure with stepped structures on both its inner and outer walls to achieve precise positioning and limiting of each component. Simultaneously, the inner diameter of the valve body 6 is larger than the outer diameter of the interface 11, and several through holes are distributed circumferentially. The ball bearing 9 is embedded in the through holes and movably connected to the valve body 6, forming a radially expandable locking unit. The first spring 3 and the washer 4 are located inside the valve body 6. One end of the first spring 3 is connected to the valve seat 1, and the other end is connected to the annular washer 4. The inner diameter of the washer 4 is larger than the outer diameter of the interface 11 but smaller than the cross-sectional outer diameter of its undercut structure. Therefore, under axial force, elastic deformation can achieve pre-tight sealing. When the interface 11 is inserted into the valve body 6, its undercut structure pushes the ball bearing 9 radially outward. After passing the undercut, the slider 8 returns to its original position under the action of the second spring 7, working with the ball bearing 9 to form an axial limit and achieve self-locking.

[0024] It should be noted that in this embodiment, the undercut structure on the interface 11 is an annular undercut, and the cross-sectional profile of the outer wall of the interface 11 tube includes square and circular shapes. Thus, under the condition of meeting the usage requirements, it can be conveniently sealed at its outlet end in conjunction with the plug device. In other embodiments, the cross-sectional profile of the outer wall of the interface 11 can also be of other types, but as long as the undercut structure of its outer wall is annular, it is acceptable. No specific limitation is made here.

[0025] In an optional embodiment, the valve seat 1 and the valve body 6 are connected by threads, and a first sealing ring 2 is provided at the threaded connection to achieve a reliable seal at the connection point, preventing gas leakage from the gap between the valve seat 1 and the valve body 6 during the test. It is understood that through the above design, this structure ensures both the stability and disassembly of the assembly, facilitating maintenance and replacement, and effectively fills the thread gap with the first sealing ring 2, improving overall airtightness and ensuring the accuracy and reliability of the test results.

[0026] In an optional embodiment, an annular groove is provided on the outer side wall of the end of the valve body 6 for insertion into the external interface 11. The axial distance from the annular groove to the end face of the valve body 6 is less than the axial distance from the center of the ball 9 to the end face of the valve body 6. A retaining ring 10 is embedded in the annular groove, and part of the retaining ring 10 is exposed outside the annular groove. This is used to prevent the slider 8 from sliding out of the insertion end of the interface 11 of the valve body 6. The physical blocking effect of the retaining ring 10 limits the slider 8, ensuring that it always slides stably along the axis within a preset stroke range outside the valve body 6. This ensures the reliability of its coordinated action with the ball 9, improves the stability of the device operation and the safety of repeated use.

[0027] In an optional embodiment, the slider 8 is provided with a matching annular groove on the side facing the retaining ring 10, which is used to effectively constrain the maximum sliding stroke of the slider 8 under the action of the spring 7, prevent it from dislodging from the valve body 6, and at the same time ensure that the slider 8 moves smoothly and is positioned accurately.

[0028] In an optional embodiment, the outer circumference of the slider 8 is provided with knurling to significantly increase the friction between the operator's fingers and the surface of the slider 8, so as to facilitate the application of axial pushing and pulling force to the slider 8 during manual operation and prevent slippage.

[0029] In an optional embodiment, the stepped structure on the inner side of the valve body 6 includes a connected inner first section and an inner second section, the diameter of which is larger than that of the inner second section; the stepped structure on the outer side of the valve body 6 includes a connected outer first section and an outer second section, the diameter of which is larger than that of the outer second section; and the stepped surface between the outer first section and the outer second section is closer to the valve seat 1 than the stepped surface between the inner first section and the inner second section, so as to realize the layered layout and precise positioning of the internal first spring 3, washer 4 and the external slider 8, second spring 7, effectively avoiding component interference, ensuring the stability of the ball 9 in radial movement, and improving the compactness and assembly reliability of the overall structure, providing precise mechanical guidance and support for the self-locking function.

[0030] In an optional embodiment, the outer side of the washer 4 slides in contact with the inner wall of the first inner section to ensure that it moves smoothly along the axial direction inside the valve body 6, ensuring that the compression and rebound process of the first spring 3 is stable and reliable. At the same time, this sliding fit structure effectively guides the movement trajectory of the washer 4, preventing it from deviating or getting stuck, ensuring the accurate action of the inner diameter of the washer 4, the outer wall of the interface 11, and the undercut structure, thereby improving the uniformity of the sealing pre-tightening force and the smoothness of the self-locking action, and enhancing the response accuracy and reusability of the overall device.

[0031] In an optional embodiment, the plug device further includes a second sealing ring 5, which is disposed in the inner first section and located between the gasket 4 and the inner second section. Its two sides abut against the stepped surface between the inner first section and the inner second section and the gasket 4, respectively. This is used to axially limit and pre-compress the second sealing ring 5 through the stepped structure, ensuring its stable positioning, effectively blocking the leakage path between the valve body 6 and the gasket 4, significantly improving the airtightness of the plug device, and ensuring stable transmission of gas pressure and sealing reliability during the test.

[0032] In an optional embodiment, the washer 4 has an inverted buckle structure on the side facing the second sealing ring 5, which is used to form an internal rigid support for the second sealing ring 5, so as to avoid excessive deformation of the second sealing ring 5 due to pressure or media impact, and to prevent it from detaching from the inner wall of the valve body 6, thereby further ensuring sealing stability. At the same time, in conjunction with the stepped structure preset inside the valve body 6, the second sealing ring 5 is limited, completely eliminating the possibility of it falling forward.

[0033] In an optional embodiment, the slider 8 is provided with a matching annular groove on the side facing the second spring 7, which works together with the stepped surface between the outer first section and the outer second section of the valve body 6 to limit the axial position of the second spring 7, prevent it from shifting or dislodging during compression and rebound, and at the same time improve the guiding accuracy and response consistency of the slider 8 movement, ensure the reliable execution of self-locking and unlocking actions, and enhance the overall stability and durability of the device.

[0034] In an optional embodiment, the valve seat 1 is provided with a through hole communicating with the valve body 6. Preferably, the inner wall of the through hole is provided with an internal thread for connecting a pipe fitting, so as to facilitate quick connection with an external air source (not shown in the figure). It can be understood that, through the above design, in the air tightness testing of pipelines with multiple plugs working together, the air inlet pipe fitting can be connected through the internal thread, and this plug device can be used as a gas input end to achieve a stable air supply to the entire pipeline system. This ensures the sealing reliability of the air inlet while improving the integration and ease of operation of the testing system, and is suitable for automated sealing testing scenarios of complex pipelines.

[0035] The working principle of this utility model is as follows: When it is necessary to seal the interface 11 with the inverted buckle structure, the knurling on the outside of the slider 8 applies force to push the slider 8 away from the retaining ring 10, compressing the second spring 7, causing the slider 8 to move axially backward along the outer wall of the valve body 6, releasing its limiting effect on the ball 9; then the interface 11 is inserted into the valve body 6, and the outer wall of the interface 11 pushes the ball 9 radially outward until the inverted buckle structure passes the position of the ball 9; at this time, the slider 8 is released, and under the elastic restoring force of the second spring 7, the slider 8 moves forward along the outer wall of the valve body 6. Its annular groove and the retaining ring 10 work together to limit the stroke of the slider 8 and push the ball 9 radially inward, so that it is locked under the inverted buckle structure of the interface 11, forming an axial self-locking and achieving reliable fixation. Simultaneously, under the preload of the first spring 3, the washer 4 presses tightly against the outer wall of the interface 11, working in conjunction with the first sealing ring 2 and the second sealing ring 5 to ensure multiple seals between the valve seat 1, valve body 6, and interface 11. After the test is completed, the slider 8 is pushed back again to release the locking of the ball 9 to the overlock structure, allowing the interface 11 to be easily pulled out, completing the disassembly. The entire process requires no tools; quick, automatic, and reliable sealing connection and release can be achieved solely through insertion, removal, and sliding actions.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and not to limit it; those skilled in the art will readily understand that the above description is only a preferred embodiment of this utility model, and is not intended to limit this utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-locking plug device, suitable for interfaces (11) with annular undercut structures distributed circumferentially on the outer wall of the outlet end, characterized in that, The plug device includes: valve seat (1), first spring (3), washer (4), valve body (6), second spring (7), slider (8) and ball (9); The valve seat (1) is detachably connected to the valve body (6); The valve body (6) is a hollow structure, with stepped structures on both its inner and outer sides; several through holes are distributed on the circumferential wall of the valve body (6); The first spring (3) and the washer (4) are housed in the valve body (6). One end of the first spring (3) abuts against the valve seat (1), and the other end abuts against the washer (4). The gasket (4) is an annular structure, and its inner diameter is configured to allow the tube portion of the interface (11) to pass through, but prevent the annular undercut structure on it from passing through; The number of the ball beads (9) is multiple, and they are movably embedded in each through hole of the valve body (6) in a one-to-one correspondence; The slider (8) is sleeved on the outside of the valve body (6), and the two ends of the second spring (7) abut against the valve body (6) and the slider (8) respectively, so that the slider (8) can slide axially along the outer wall of the valve body (6); The slider (8) has a first position and a second position: when the slider (8) is in the first position under the action of the second spring (7), its inner wall presses the ball (9) to move toward the central axis of the valve body (6) to form a limiting structure for locking the external interface (11); when the slider (8) is in the second position, its inner wall releases the pressure on the ball (9).

2. The plugging device according to claim 1, characterized in that, The valve seat (1) and the valve body (6) are connected by a thread, and a first sealing ring (2) is provided at the threaded connection.

3. The plugging device according to claim 1 or 2, characterized in that, An annular groove is provided on the outer side wall of the end of the valve body (6) for inserting the external interface (11). The axial distance from the annular groove to the end face of the valve body (6) is less than the axial distance from the center of the ball (9) to the end face of the valve body (6).

4. The plugging device according to claim 3, characterized in that, The annular groove is fitted with a retaining ring (10), and part of the retaining ring (10) is exposed outside the annular groove.

5. The plugging device according to claim 4, characterized in that, The slider (8) has a matching annular groove on the side facing the retaining ring (10).

6. The plugging device according to claim 1, characterized in that, The slider (8) has knurling on its outer circumference.

7. The plugging device according to claim 1 or 2, characterized in that, The stepped structure inside the valve body (6) includes a connected inner first section and an inner second section, wherein the diameter of the inner first section is larger than the diameter of the inner second section. The stepped structure on the outside of the valve body (6) includes a connected outer first section and an outer second section, wherein the diameter of the outer first section is larger than the diameter of the outer second section; Furthermore, the step surface between the outer first segment and the outer second segment is closer to the valve seat (1) than the step surface between the inner first segment and the inner second segment.

8. The plugging device according to claim 7, characterized in that, The plug device also includes a second sealing ring (5), which is located in the inner first section and between the gasket (4) and the inner second section. Its two sides abut against the step surface between the inner first section and the inner second section and the gasket (4), respectively.

9. The plugging device according to claim 8, characterized in that, The outer side of the washer (4) makes sliding contact with the inner wall of the first inner section; The washer (4) has an inverted buckle structure on the side facing the second sealing ring (5).

10. The plugging device according to claim 7, characterized in that, The slider (8) has a matching annular groove on the side facing the second spring (7).

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