High-pressure pulsation air tightness testing device and method

Abstract

The invention relates to a high-pressure pulsation air tightness testing device and method. The high-pressure pulsation air tightness testing device comprises a servo electric cylinder, a connecting device, a tool, an inflation nozzle, an inflation device, a visual detection device and the like. A servo electric cylinder is used for driving a tool to do reciprocating linear motion, a gas source (nitrogen) enters a cavity I of a piston through a gas source I, so that the piston does reciprocating motion, and a channel 1 and a channel 2 of a tested object charging connector are in an open or closed state. And pressurizing the cavity II through pressure pulsation to enable the cavity I to generate pulsating pressure of 9-22.5 MPa-9 MPa, inflating and deflating according to a set pulsating frequency of 5-6 times / min and repeating for 5 times, and if no bubbles are detected in the liquid in the visual detection device within 2 minutes, considering that the air tightness of the detected object charging connector is qualified, otherwise, considering that the air tightness of the detected object charging connector is unqualified. The high-pressure pulsation working condition can be effectively simulated, the air tightness detection efficiency of the charging connector is improved, and the aerospace engineering technology and industry development is promoted.

Description

Technical Field

[0001] The invention relates to a high-pressure pulsation air tightness test device and method, which are used for detecting the air tightness of an inflation nozzle of a tested object. Background Art

[0002] Traditional air tightness testing methods mostly rely on simple static pressure testing. However, this method has certain defects: on the one hand, static testing has low sensitivity for detecting small leaks, especially in high-pressure environments. The pressure changes caused by small leaks are often difficult to accurately capture; on the other hand, products in many actual application scenarios are not in a static pressure environment when working, but present a complex high-pressure pulsation state, which will cause pressure pulsation inside the product. Traditional static pressure testing cannot realize the entire process of pressure pulsation, resulting in its test results not being consistent with the actual working conditions, making it difficult to effectively evaluate the air tightness of the product in actual use.

[0003] In view of the shortcomings of traditional static air tightness testing methods in terms of detection accuracy, ability to simulate actual working conditions, and testing efficiency, this invention patent develops a device that can effectively simulate high-pressure pulsating working conditions, and at the same time publishes its air tightness testing method. Summary of the invention

[0004] In order to solve the technical problems existing in the current background technology, the present invention proposes a high-pressure pulsation airtightness testing device and method, and the device realizes airtightness detection by setting periodic pressure pulsation and pulsation frequency.

[0005] The present invention provides a high-pressure pulsation air tightness testing device and method, comprising: The servo electric cylinder drives the tooling to perform reciprocating linear motion.

[0006] The connecting device has one end connected to the servo electric cylinder and the other end connected to the tooling, so as to transmit the force of the servo electric cylinder to the tooling.

[0007] The tooling is connected to the inflation nozzle of the object to be measured, drives the stopper in the inflation nozzle of the object to be measured to move downward, compresses the spring, and moves the valve core downward, so that the channel 2 of the inflation nozzle of the object to be measured is in an open state.

[0008] The inflation nozzle, as the object to be measured, performs inflation or pressure maintenance through the opening or closing state of the primary sealing channel 1 and the secondary sealing channel 2.

[0009] The inflation device pressurizes the interior through pressure pulsation to achieve the air tightness detection condition of high-pressure pulsation.

[0010] The visual inspection device observes and captures whether bubbles are generated in the test liquid to determine whether the air tightness of the inflation nozzle of the object being tested is qualified.

[0011] Gas source I allows the gas source (nitrogen) to enter chamber I of the inflation device.

[0012] Gas source II, pressurizes chamber II of the inflation device during air tightness testing.

[0013] The exhaust channel, when conducting air tightness testing, the inflation nozzle of the object to be tested is connected to the visual testing device and connected to the testing liquid.

[0014] Preferably, the inflation device comprises: The pressure sensor detects the pressure in the inflation device and determines the pressure value of the gas source.

[0015] The piston performs reciprocating motion and completes the compression of the gas by changing the volume of chamber I and chamber II to achieve the test conditions.

[0016] Chamber I is arranged above the piston.

[0017] Chamber II is arranged below the piston.

[0018] Preferably, the visual detection device comprises: Exhaust inlet: When performing air tightness testing, the exhaust channel is connected to the visual detection device and connected to the detection liquid.

[0019] A water tank containing a testing liquid.

[0020] The conduit is connected to the exhaust inlet, and the exhaust channel is connected to the visual detection device and then connected to the detection liquid.

[0021] The glass window is arranged in front of the water tank, so that the visual detection device can clearly observe whether there are bubbles in the detection liquid.

[0022] The camera is arranged in front of the glass window, and when bubbles appear, the camera captures and takes pictures.

[0023] The beneficial effects brought by the disclosure of the present invention are: A high-pressure pulsating air tightness test device and method, which utilizes a servo electric cylinder to drive a tooling to perform reciprocating linear motion, and an air source (nitrogen) enters chamber Ⅰ of a piston through air source Ⅰ, so that the piston performs reciprocating motion to compress the gas to achieve test conditions, and channels 1 and 2 of an air nozzle of a tested object are in an open or closed state. If a visual inspection device detects that no bubbles are generated in a water tank, it indicates that the air tightness of the air nozzle of the tested object is qualified; if bubbles are detected in the water tank, it indicates that the air tightness of the air nozzle of the tested object is unqualified.

[0024] A high-pressure pulsation air tightness testing device and method, the high-pressure pulsation air tightness testing method is: a. Keep the valve core of the inflation nozzle of the object to be tested in the closed state, open the valve, keep the pressure of the inflation nozzle of the object to be tested at 13MPa, and check the air tightness; b. Close the valve and pressurize chamber II with gas source II to increase the air pressure in chamber I to 22.5 MPa, and check the air tightness; c. Under state b, reduce the air pressure in chamber I to 9MPa and check the air tightness; The air tightness tests in conditions a, b, and c above are all conducted by observing whether bubbles are generated in the water tank, and the detection time is 2 minutes; the air tightness detection method includes static air tightness: after inflation, the exhaust channel is connected to the detection liquid through the exhaust inlet of the visual detection device. If no bubbles are generated within 2 minutes, the air tightness of the inflation nozzle of the object under test is deemed to be qualified, otherwise the air tightness of the inflation nozzle of the object under test is unqualified (the bubbles generated by the emptying process are deemed to be invalid judgment); dynamic air tightness: after inflation, the exhaust channel is connected to the detection liquid through the exhaust inlet of the visual detection device, and the inflation device is reversely input with a set pressure pulsation. The pressure pulsation is to pressurize chamber II so that chamber I produces a pulsating pressure of 9MPa~22.5MPa~9MPa, and the air is inflated and deflated at a set pulsation frequency of 5~6 times / min and repeated 5 times. If no bubbles are generated within 2 minutes, the air tightness of the inflation nozzle of the object under test is deemed to be qualified, otherwise the air tightness of the inflation nozzle of the object under test is unqualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram disclosed in the present invention; Figure 2 It is a schematic diagram of the structure of the inflation nozzle of the object to be tested disclosed by the present invention; Figure 3 It is a schematic structural diagram of two channels of the inflation nozzle of the measured object disclosed in the present invention.

[0026] Among them: 1 servo electric cylinder, 2 connecting device, 3 tooling, 4 inflation nozzle, 5 inflation device, 6 visual inspection device, 7 air source, 8 exhaust channel, 3 tooling includes 3-1 tooling sleeve, 3-2 connecting block, 3-3 multi-function joint, 3-4 adjusting shaft, 4 inflation nozzle includes 4-1 plugging cap, 4-2 valve, 4-3 stopper, 4-4 spring, 4-5 valve core, 4-6 valve body, 4-7 channel 1, 4-8 channel 2, 5 inflation device includes 5-1 pressure sensor, 5-2 piston and 5-2-1 chamber I and 5-2-2 chamber II, 6 visual inspection device includes 6-1 exhaust inlet, 6-2 water tank, 6-3 conduit, 6-4 glass window, 6-5 camera, 7 air source includes 7-1 air source I and 7-2 air source II, 8 exhaust channel includes 8-1 exhaust port and 8-2 exhaust conduit. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left" and "right" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "1" and "2" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] Reference Figure 1 The present invention provides a high-pressure pulsation airtightness testing device and method, comprising: 1 servo electric cylinder drives 3 tooling to do reciprocating linear motion.

[0030] 2 connecting device, one end of which is connected to 1 servo electric cylinder, and the other end of which is connected to 3 tooling, so as to transmit the force of 1 servo electric cylinder to 3 tooling.

[0031] 3 tooling is connected with the inflation nozzle 4 of the measured object, driving the 4-3 stopper in the inflation nozzle 4 of the measured object to move downward, compressing the 4-4 spring, so that the 4-5 valve core moves downward, and the 4-8 channel 2 of the inflation nozzle 4 of the measured object is in an open state.

[0032] 4 The inflation nozzle, as the object to be measured, performs inflation or pressure maintenance through the opening or closing state of the primary seal 4-7 channel 1 and the secondary seal 4-8 channel 2.

[0033] 5. The inflation device pressurizes the interior through pressure pulsation to achieve the air tightness detection condition of high-pressure pulsation.

[0034] 6 Visual inspection device, observes and captures whether bubbles are generated in the test liquid to determine whether the air tightness of the inflation nozzle of the test object 4 is qualified.

[0035] 7-1 gas source Ⅰ, allows the gas source (nitrogen) to enter the 5-2-1 chamber Ⅰ of the 5 inflation device.

[0036] 7-2 Air source II, pressurizes chamber 5-2-2 II of 5 inflation device during air tightness test.

[0037] 8 exhaust channel, when performing air tightness detection, the inflation nozzle 4 of the object to be tested is connected to the 6 visual detection device and connected to the detection liquid.

[0038] Reference Figure 1 , further, the 5 inflation devices include: 5-1 pressure sensor, detects the pressure in 5 inflation device and determines the pressure value of the gas source.

[0039] The 5-2 piston performs reciprocating motion and completes the compression of the gas by changing the volume of the 5-2-1 chamber Ⅰ and the 5-2-2 chamber Ⅱ to achieve the test conditions.

[0040] 5-2-1 Chamber I is arranged above the 5-2 piston.

[0041] 5-2-2 Chamber II is arranged below the 5-2 piston.

[0042] Reference Figure 1 , further, the 6 visual detection device comprises: 6-1 exhaust inlet, when performing air tightness testing, 8 exhaust channel is connected to 6 visual detection device and connected to the detection liquid.

[0043] 6-2 Water tank, filled with detection liquid.

[0044] The 6-3 conduit is connected to the 6-1 exhaust inlet, and the 8 exhaust channel is connected to the 6 visual detection device and then connected to the detection liquid.

[0045] 6-4 glass window, arranged in front of 6-2 water tank, is convenient for 6 visual detection device to clearly observe whether there are bubbles in the detection liquid.

[0046] 6-5 camera is set in front of 6-4 glass window. When bubbles appear, they are captured and photographed by the camera.

[0047] Reference Figure 2 , the 4-2 valve of the inflation nozzle of the measured object 4 drives the 4-3 block to move downward under the pressure of the 3-4 adjusting shaft, compressing the 4-4 spring, so that the 4-5 valve core moves downward, and the 4-8 channel 2 is in the open state.

[0048] Combination Figure 3 Further, the inflation nozzle of the measured object 4 includes a primary seal 4-7 channel 1 and a secondary seal 4-8 channel 2 that appears under the action of a compression 4-4 spring.

[0049] When using the patent of this invention, the air tightness test is performed by the following high-pressure pulsating air tightness test method: a. Keep the 4-5 valve core of the 4th inflation nozzle of the object under test in the closed state, open the 4-2 valve, keep the pressure of the 4th inflation nozzle of the object under test at 13MPa, and check the air tightness; b. Close the 4-2 valve, and use the 7-2 gas source II to pressurize the 5-2-2 chamber II, so that the air pressure of the 5-2-1 chamber I increases to 22.5MPa, and check the air tightness; c. Under state b, reduce the air pressure of chamber Ⅰ of 5-2-1 to 9MPa and check the air tightness; The air tightness tests in conditions a, b, and c above are all conducted by observing whether bubbles are generated in the 6-2 water tank, and the detection time is 2 minutes; the air tightness detection method includes static air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. If no bubbles are generated within 2 minutes, the air tightness of the 4 inflation nozzle of the tested object is deemed to be qualified, otherwise the air tightness of the 4 inflation nozzle of the tested object is unqualified (the bubbles generated by the emptying process are deemed to be invalid judgment); dynamic air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. If no bubbles are generated within 2 minutes, the air tightness of the 4 inflation nozzle of the tested object is deemed to be qualified, otherwise the air tightness of the 4 inflation nozzle of the tested object is deemed to be unqualified (the bubbles generated by the emptying process are deemed to be invalid judgment); dynamic air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. The channel is connected to the test liquid through the 6-1 exhaust inlet of the 6 visual inspection device, and at the same time, the set pressure pulsation is reversely input to the 5 inflation device. The pressure pulsation is to pressurize the 5-2-2 chamber II, so that the 5-2-1 chamber I produces a pulsating pressure of 9MPa~22.5MPa~9MPa, and the air is filled and discharged at a set pulsation frequency of 5~6 times / min and repeated 5 times. If no bubbles are generated within 2 minutes, it is regarded that the air tightness of the inflation nozzle 4 of the measured object is qualified, otherwise the air tightness of the inflation nozzle 4 of the measured object is unqualified.

[0050] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be used without departing from the spirit or scope of the present application. The above disclosed methods and technical contents can be used to make possible changes and modifications to the technical solutions of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention are within the protection scope of the technical solutions of the present invention.

Claims

1. A high-pressure pulsation air tightness testing device and method, characterized in that: include: 1 servo electric cylinder, 2 connecting device, 3 tooling, 4 inflation nozzle, 5 inflation device, 6 visual inspection device, 7 air source, 8 exhaust channel, 3 tooling includes 3-1 tooling sleeve, 3-2 connecting block, 3-3 multifunctional joint, 3-4 adjusting shaft, 4 inflation nozzle includes 4-1 plugging cap, 4-2 valve, 4-3 stopper, 4-4 spring, 4-5 valve core, 4-6 valve body, 4-7 channel 1, 4-8 channel 2, 5 inflation device includes 5-1 pressure sensor, 5-2 piston and 5-2-1 chamber Ⅰ and 5-2-2 chamber Ⅱ, 6 visual inspection device includes 6-1 exhaust inlet, 6-2 water tank, 6-3 conduit, 6-4 glass window, 6- 5 cameras, 7 gas sources include 7-1 gas source Ⅰ and 7-2 gas source Ⅱ, 8 exhaust channel includes 8-1 exhaust port and 8-2 exhaust duct; 1 servo electric cylinder drives 3 tooling to do reciprocating linear motion, the gas source (nitrogen) enters 5-2-1 chamber Ⅰ of 5-2 piston through 7-1 gas source Ⅰ, so that 5-2 piston does reciprocating motion, 4-7 channel 1 and 4-8 channel 2 of the inflation nozzle of the measured object 4 are in an open or closed state, if 6 visual inspection device detects that no bubbles are generated in 6-2 water tank, it means that the air tightness of the inflation nozzle of the measured object 4 is qualified; if bubbles are detected in 6-2 water tank, it means that the air tightness of the inflation nozzle of the measured object 4 is unqualified.

2. A high-pressure pulsation airtightness testing device and method according to claim 1, characterized in that: The 4-2 valve of the inflation nozzle of the measured object 4 drives the 4-3 block to move downward under the pressure of the 3-4 adjusting shaft, compresses the 4-4 spring, moves the 4-5 valve core downward, and puts the 4-8 channel 2 in an open state; the inflation nozzle of the measured object 4 includes the first seal 4-7 channel 1 and the secondary seal 4-8 channel 2 that appears under the action of the compression of the 4-4 spring.

3. A high-pressure pulsation airtightness testing device and method according to claim 1, characterized in that: The inflation method is as follows: the inflation nozzle of the measured object 4 is connected to the 3-4 adjustment shaft, the lower end of the inflation nozzle of the measured object 4 is connected to the 5-2-1 chamber Ⅰ, the 3-4 adjustment shaft is connected to the 7-1 air source Ⅰ, and the 7-1 air source Ⅰ with a pressure of 15MPa is inflated to the 5-2-1 chamber Ⅰ through the inflation nozzle of the measured object 4 to a pressure of 13MPa. Close the 7-1 air source Ⅰ to keep the pressure in the inflation nozzle of the measured object 4 at 13MPa.

4. A high-pressure pulsation airtightness testing device and method according to claim 1, characterized in that: The high pressure pulsation air tightness detection method is: a. Keep the 4-5 valve core of the 4th inflation nozzle of the object under test in the closed state, open the 4-2 valve, keep the pressure of the 4th inflation nozzle of the object under test at 13MPa, and check the air tightness; b. Close the 4-2 valve, and use the 7-2 gas source II to pressurize the 5-2-2 chamber II, so that the air pressure of the 5-2-1 chamber I increases to 22.5MPa, and check the air tightness; c. Under state b, reduce the air pressure of chamber Ⅰ of 5-2-1 to 9MPa and check the air tightness; The air tightness tests in conditions a, b, and c above are all conducted by observing whether bubbles are generated in the 6-2 water tank, and the detection time is 2 minutes; the air tightness detection method includes static air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. If no bubbles are generated within 2 minutes, the air tightness of the 4 inflation nozzle of the tested object is deemed to be qualified, otherwise the air tightness of the 4 inflation nozzle of the tested object is unqualified (the bubbles generated by the emptying process are deemed to be invalid judgment); dynamic air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. If no bubbles are generated within 2 minutes, the air tightness of the 4 inflation nozzle of the tested object is deemed to be qualified, otherwise the air tightness of the 4 inflation nozzle of the tested object is deemed to be unqualified (the bubbles generated by the emptying process are deemed to be invalid judgment); dynamic air tightness: after inflation, the 8 exhaust channel is connected to the detection liquid through the 6-1 exhaust inlet of the 6 visual detection device. The channel is connected to the test liquid through the 6-1 exhaust inlet of the 6 visual inspection device, and at the same time, the set pressure pulsation is reversely input to the 5 inflation device. The pressure pulsation is to pressurize the 5-2-2 chamber II, so that the 5-2-1 chamber I produces a pulsating pressure of 9MPa~22.5MPa~9MPa, and the air is filled and discharged at a set pulsation frequency of 5~6 times / min and repeated 5 times. If no bubbles are generated within 2 minutes, it is regarded that the air tightness of the inflation nozzle 4 of the measured object is qualified, otherwise the air tightness of the inflation nozzle 4 of the measured object is unqualified.

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