An air-tightness detection device for an air path component

Abstract

The utility model discloses a kind of air path components's airtightness detection device, it is related to air path component detection technical field.Its structure includes gas source, to-be-measured solenoid valve, leak detection groove, gas collection cover, PLC and relay;Leak detection groove is filled with electronic fluorination liquid;To-be-measured solenoid valve is placed in leak detection groove bottom;To-be-measured solenoid valve air inlet connector is connected with gas source by gas tube.The utility model is immersed by electronic fluorination liquid and realizes the high efficiency, nondestructive testing of solenoid valve airtightness by PLC timing control technology;Equipment structure is simple, cost is reduced, applicable to batch detection and maintenance scene;During detection process, solenoid valve reciprocating on-off electricity simulates actual working condition, bubble visualized accurate positioning leak point, avoid unqualified product to flow into next process, significantly improve product quality;The chemical inertia of electronic fluorination liquid ensures that element is not corroded in detection process, convenient operation and result are reliable, provide low-cost, high-precision solution for industrial automation and equipment maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of gas circuit component testing technology, and in particular relates to a gas circuit component airtightness testing device. Background Technology

[0002] In the field of industrial automation production and equipment maintenance, solenoid valves, as key pneumatic control components, directly affect the stability and safety of the system due to their sealing performance. Traditional testing methods often rely on immersion or coating with testing solutions, which suffer from low efficiency, poor accuracy, and easy contamination of components.

[0003] With the increasing demands for quality control in the manufacturing industry, there is an urgent need for a fast, accurate, and non-destructive airtightness testing technology. While some existing devices can achieve automated testing, they suffer from drawbacks such as complex equipment, high cost, or inability to simulate the actual operating conditions (reciprocating drive) of solenoid valves. Therefore, we have designed an airtightness testing device for pneumatic components.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a gas tightness testing device for gas circuit components. Through innovative design, combined with electronic fluorinated liquid and PLC control technology, it solves the problem of balancing efficiency and accuracy in the batch testing of solenoid valves, while reducing equipment costs.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an airtightness testing device for a gas circuit component, comprising a gas source, a solenoid valve under test, a leak detection tank, a gas collection hood, a PLC, and a relay; the leak detection tank is filled with electronic fluorinated liquid; the solenoid valve under test is placed at the bottom of the leak detection tank; the air inlet connector of the solenoid valve under test is connected to the gas source through a gas pipe; the remaining connectors of the solenoid valve under test are sealed with plugs; the gas collection hood is placed inside the leak detection tank and covers the solenoid valve under test, and there are no air bubbles in the gas collection hood before the solenoid valve under test is tested; the PLC controls the coil of one end of the solenoid valve under test to be energized and de-energized at regular intervals through the relay. The PLC input terminal block is connected to at least a start button, a pause button, and a reset button. The PLC is programmed to output a level signal to a relay upon receiving a start button signal. The relay engages, energizing the coil on the solenoid valve under test (SDT). The SDT switches to airflow, preventing venting when a plug is installed. The internal air pressure of the SDT is maintained. If there is leakage in the valve body seal or structure, air bubbles will escape and be collected by the gas collection hood. After a set number of seconds, the relay disconnects, the coil on the SDT is de-energized, and the SDT resets. After a few seconds of pause, the process restarts, achieving a timed reciprocating energization and de-energization of the coil on one end of the SDT. When the pause button is pressed, the PLC stops outputting any signals, and the SDT resets. Pressing the reset button returns the entire program to a waiting state.

[0007] As a preferred embodiment of this utility model, the gas source includes an air pump, an air storage tank, and a pipeline valve and a pressure regulating valve connected and installed at the air outlet of the air storage tank; the air pipe is connected to the pressure regulating valve.

[0008] As a preferred embodiment of this utility model, four support feet are fixed on the left half of the bottom surface of the leak detection groove; right-angled grooves for inserting the gas collection hood are opened at the inner corners of the four support feet; and four support bars for supporting the gas collection hood are fixed on the right half of the bottom surface of the leak detection groove.

[0009] As a preferred embodiment of this utility model, the upper end of the gas collection hood is provided with an upward-facing cavity; a conical section is provided between the cavity and the lower half of the gas collection hood; and size markings are engraved on the outer wall of the cavity from top to bottom.

[0010] As a preferred embodiment of this utility model, an automatic drainer is installed at the lower end of the gas storage tank.

[0011] In a preferred embodiment of this invention, the electronic fluorinated fluid is one or more of perfluorohexane, perfluorobutane, and methoxynonafluorobutane. Perfluorohexane and perfluorobutane, for example, possess high insulation, non-flammability, and strong chemical stability, making them suitable for applications requiring high temperature and high insulation. Methoxynonafluorobutane is one of the most widely used electronic fluorinated fluid components. It combines low viscosity, high volatility, and good insulation properties, and is commonly used in data center immersion liquid cooling and semiconductor cleaning. When selecting an electronic fluorinated fluid, a type that does not corrode the housing and seals of the solenoid valve under test should be chosen.

[0012] This utility model has the following beneficial effects: This invention uses a PLC to time-control the reciprocating on / off state of a solenoid valve, simulating actual working conditions. Combined with visual detection of bubbles in the electronic fluorinated liquid, it can quickly locate leaks and improve detection efficiency. The electronic fluorinated liquid has high insulation and chemical inertness, and does not corrode the solenoid valve housing and seals, avoiding secondary pollution caused by residues of traditional detection solutions.

[0013] This utility model adopts a modular design (air source, leak detection tank, PLC), which results in a compact structure and lower cost compared to similar products on the market. It is suitable for batch testing and leak detection by maintenance departments.

[0014] This invention allows for real-time observation of bubble positions, reducing errors in human judgment and improving the repeatability of detection.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the airtightness testing device for the air circuit components of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure when the solenoid valve under test and the gas collection hood are installed in the leak detection tank.

[0019] Figure 3 This is a schematic diagram of the leak detection tank.

[0020] Figure 4 This is a schematic diagram of the gas collection hood.

[0021] The attached diagram lists the components represented by each number as follows: 1-Gas source, 2-Solenoid valve under test, 3-Leak detection tank, 4-Gas collection hood, 5-PLC, 6-Relay, 7-Gas pipe, 8-Sealing head, 11-Gas pump, 12-Gas storage tank, 13-Pipeline valve, 14-Pressure regulating valve, 31-Support foot, 32-Right angle groove, 33-Support bar, 41-Pipe section, 42-Dimension marking, 43-Cone section. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Specific Implementation Example 1: Please see Figure 1-4 As shown, this utility model is an airtightness testing device for pneumatic components, designed to quickly and accurately test the self-sealing performance of solenoid valves in pneumatic components and their sealing performance after reciprocating drive use. The device mainly includes a gas source 1, a solenoid valve under test 2, a leak detection tank 3, a gas collection hood 4, a PLC 5, and a relay 6.

[0024] The air source 1 consists of an air pump 11, an air tank 12, and a pipeline valve 13 and a pressure regulating valve 14 connected to the air outlet of the air tank 12. The air pump 11 provides compressed air, the air tank 12 stores compressed air and stabilizes the air pressure, the pipeline valve 13 controls the opening and closing of the air path, and the pressure regulating valve 14 adjusts the output air pressure to the required value. The air pipe 7 is connected to the pressure regulating valve 14, delivering the adjusted compressed air to the solenoid valve 2 under test. In addition, an automatic drain (not shown in the figure) is installed at the lower end of the air tank 12 to periodically remove condensate from the air tank, preventing moisture from affecting the detection.

[0025] The leak detection tank 3 is filled with an electronic fluorinated liquid, which is selected from one or more of perfluorohexane, perfluorobutane, and methoxynonafluorobutane. These substances have the characteristics of high insulation, non-flammability, and strong chemical stability, and do not corrode the housing and seals of the solenoid valve 2 under test. Four support feet 31 are fixed on the left half of the bottom surface of the leak detection tank 3. Right-angled grooves 32 for inserting the gas collection hood 4 are opened on the inner corners of the four support feet 31. Four support bars 33 are fixed on the right half of the bottom surface of the leak detection tank 3 to support the gas collection hood 4, ensuring that the gas collection hood 4 is placed stably.

[0026] The gas collection hood 4 is made of transparent acrylic sheet or glass. The gas collection hood 4 is placed inside the leak detection tank 3 and covers the solenoid valve 2 to be tested. Before testing, it must be confirmed that there are no air bubbles inside the gas collection hood 4. The upper end of the gas collection hood 4 has an upward-facing tubular section 41, and a conical section 43 is provided between the tubular section 41 and the lower half of the gas collection hood 4 to optimize the bubble collection effect. Size markings 42 are engraved on the outer wall of the tubular section 41 from top to bottom to facilitate observation of the height and number of rising bubbles.

[0027] The solenoid valve 2 under test is placed at the bottom of the leak detection tank 3. Its air inlet is connected to the air source 1 via the air pipe 7, and the remaining connectors are sealed with plugs 8 to ensure that gas can only pass through the preset channel of the solenoid valve 2 under test during testing. The PLC 5 acts as the control core, controlling the timed reciprocating energization of one end of the coil of the solenoid valve 2 under test via a relay 6. Specifically, the input terminals of the PLC 5 are connected to at least a start button, a pause button, and a reset button. When the start button is pressed, the PLC 5 receives a signal and outputs a level signal to the relay 6, causing the relay 6 to engage and energize the coil on the solenoid valve 2 under test, switching it to the air-permeable state. With the plugs 8 installed, gas cannot escape from the other connectors of the solenoid valve 2 under test, maintaining internal pressure. If the valve body seal leaks or there is a leak in the structure, air bubbles will emerge and be collected by the gas collection hood 4. After a set number of seconds, the relay 6 disconnects, the coil on the solenoid valve 2 under test is de-energized, and the solenoid valve 2 under test resets. After a few seconds of pause, the above process is repeated to achieve the timed reciprocating energization and de-energization of one end of the coil of the solenoid valve 2 under test, simulating the actual working state of the solenoid valve.

[0028] During operation, the sealing performance of the solenoid valve 2 under test can be preliminarily judged by observing whether bubbles emerge from the gas collection hood 4, as well as the number and rising speed of the bubbles. Simultaneously, the PLC 5 can be equipped with a touch screen or host computer software to display real-time test data, cycle count, power-on time, and other information, facilitating monitoring and recording by the operator. When the pause button is pressed, the PLC 5 stops outputting any signals, and the solenoid valve 2 under test is reset; when the reset button is pressed, the entire program returns to the waiting running state, facilitating restarting the test or performing other operations.

[0029] When selecting an electronic fluorinated liquid, it is essential to ensure that it does not corrode the housing and seals of the solenoid valve 2 under test, so as not to affect the test results. Simultaneously, based on the specifications of the solenoid valve 2 under test and the testing requirements, the output air pressure of the pressure regulating valve 14 and the parameters of the timer in PLC5 should be appropriately set to ensure the accuracy and reliability of the test.

[0030] One specific application of this embodiment is the batch airtightness testing of solenoid valves. This device can quickly screen out solenoid valves with substandard sealing performance, providing accurate testing. The equipment is simple and reliable, effectively preventing defective products from entering the next process, thereby improving product quality and production efficiency.

[0031] In addition, this equipment is simple, reliable, and inexpensive, and can also be used by maintenance departments to identify leaks.

[0032] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A device for detecting the airtightness of a gas circuit component, characterized in that: It includes a gas source (1), a solenoid valve to be tested (2), a leak detection tank (3), a gas collection hood (4), a PLC (5), and a relay (6); the leak detection tank (3) is filled with electronic fluorinated liquid; The solenoid valve (2) to be tested is placed at the bottom of the leak detection tank (3); the air inlet of the solenoid valve (2) to be tested is connected to the air source (1) through the air pipe (7); the other connectors of the solenoid valve (2) to be tested are sealed with plugs (8); the gas collection hood (4) is placed in the leak detection tank (3) and covers the solenoid valve (2) to be tested, and there are no air bubbles in the gas collection hood (4) before the solenoid valve (2) to be tested is tested; The PLC (5) controls the coil of one end of the solenoid valve (2) under test to be switched on and off at regular intervals through the relay (6).

2. The airtightness testing device for gas circuit components according to claim 1, characterized in that, The gas source (1) includes an air pump (11), an air storage tank (12), and a pipeline valve (13) and a pressure regulating valve (14) connected and installed at the air outlet of the air storage tank (12); the air pipe (7) is connected to the pressure regulating valve (14).

3. The airtightness testing device for gas circuit components according to claim 1, characterized in that, Four support feet (31) are fixed on the left half of the bottom surface of the leak detection groove (3); right-angled grooves (32) for inserting the gas collection hood (4) are opened on the inner corners of the four support feet (31); four support bars (33) for supporting the gas collection hood (4) are fixed on the right half of the bottom surface of the leak detection groove (3).

4. The airtightness testing device for gas circuit components according to claim 1, characterized in that, The gas collection hood (4) has an upward-facing cavity (41) at its upper end; a conical section (43) is provided between the cavity (41) and the lower half of the gas collection hood (4); and size markings (42) are engraved on the outer wall of the cavity (41) from top to bottom.

5. The airtightness testing device for gas circuit components according to claim 2, characterized in that, An automatic drainer is installed at the lower end of the gas storage tank.

6. The airtightness testing device for a gas circuit component according to claim 1, characterized in that, The electronic fluorinated liquid is one or more of perfluorohexane, perfluorobutane, and methoxynonfluorobutane.

7. The airtightness testing device for a gas circuit component according to claim 1, characterized in that, The PLC (5) signal input connection terminal is connected to a start button, a pause button and a reset button.

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