An intelligent constant pressure high-precision leak detector and leak detection method

Abstract

The present invention discloses an intelligent constant pressure high-precision leak detector, comprising a constant pressure detection box and a control box, wherein a vacuum pump, a controller and a gas storage tank are provided in the control box, a fixed electromagnet, a gas detection mechanism, a pressure detection mechanism and an exhaust detection mechanism are provided in the constant pressure detection box, the constant pressure detection box is connected to the vacuum pump via a vacuum tube, the constant pressure detection box is connected to the gas storage tank via an inflation tube, the constant pressure detection box is provided with a pressure relief valve, the vacuum valve on the vacuum tube, the inflation valve on the inflation tube, the pressure relief valve, the fixed electromagnet, the gas detection mechanism, the pressure detection mechanism and the exhaust detection mechanism are all electrically connected to the controller. At the same time, a leak detection method based on the above-mentioned intelligent constant pressure high-precision leak detector is disclosed. By using the above-mentioned intelligent constant pressure high-precision leak detector and the leak detection method, the detection efficiency is high and the operation is convenient. At the same time, the leak position can be determined, thereby improving the leak detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of leak detection, and in particular to an intelligent constant-pressure high-precision leak detector and a leak detection method. Background Art

[0002] Existing leak detection technologies use inflation or vacuum methods, which fill (or extract) air or other gases inside the tested system at a specified pressure, interrupt inflation, and balance the internal pressure of the system. The vacuum method does not require this step, and detects the pressure drop inside the system within a specified time (the pressure increases in the vacuum method), and exhausts the system after the test is completed (the system is refilled with air in the vacuum method). If there is a specific gas in the tested part, once the gas leaks, although the detection pressure can be quickly reached, the leaked gas is extracted, affecting the detection efficiency, and the leakage location cannot be determined. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent constant pressure high-precision leak detector and a leak detection method, which have high detection efficiency and convenient operation, and can simultaneously determine the leak location and improve the leak detection accuracy.

[0004] To achieve the above objectives, the present invention provides an intelligent constant pressure high-precision leak detector, comprising a constant pressure detection box and a control box, wherein a vacuum pump, a controller, and a gas storage tank are provided in the control box, an outlet pipe of the vacuum pump is connected to an exhaust pipe and a gas storage tank via a three-way solenoid valve, and a pressure gauge and a three-way solenoid valve of the gas storage tank are both connected to the controller;

[0005] The constant pressure detection box is provided with a fixed electromagnet, a gas detection mechanism, a pressure detection mechanism and an exhaust detection mechanism. The constant pressure detection box is connected to the vacuum pump through a vacuum tube, and the constant pressure detection box is connected to the gas storage tank through an inflation tube. The constant pressure detection box is provided with a pressure relief valve. The vacuum valve on the vacuum tube, the inflation valve on the inflation tube, the pressure relief valve, the fixed electromagnet, the gas detection mechanism, the pressure detection mechanism and the exhaust detection mechanism are all electrically connected to the controller.

[0006] Preferably, the fixed electromagnet is embedded in the bottom of the constant pressure detection box to fix the test piece.

[0007] Preferably, the gas detection mechanism is symmetrically provided with two and includes several fixed mesh plates, a gas detection unit and an electric rotating shaft. The several fixed mesh plates are hinged in sequence through the electric rotating shaft. Several through holes are opened on the fixed mesh plates. The gas detection unit includes a gas probe, a telescopic rod, a return spring and a limit plate. The limit plate is fixed to one end of the telescopic rod, and the other end of the telescopic rod is fixedly connected to the gas probe through the through hole. The return spring is sleeved on the telescopic rod, and one end of the return spring is against the fixed mesh plate, and the other end of the return spring is against the gas probe. A gas sensor and a proximity switch are provided in the gas probe.

[0008] Preferably, a fixing bar is fixed to the outer end of the fixed mesh plate at one end, and the fixing bar is arranged in a fixed chute at the bottom of the constant pressure detection box, and a plurality of the fixed chute are arranged in parallel.

[0009] Preferably, at least four pressure detection mechanisms are provided, and several of the pressure detection mechanisms are fixed in a constant pressure detection box. The pressure detection mechanism includes a fixed shell, a pressure sensor and a temperature and humidity sensor, and the temperature and humidity sensor and the pressure sensor are both fixed in the fixed shell.

[0010] Preferably, the exhaust detection mechanism is arranged opposite to the vacuum tube in the constant pressure detection box, and the exhaust detection mechanism includes a fixed plate and a gas sensor, the gas sensor is fixed on the fixed plate, and the fixed plate is fixed to the inner wall of the constant pressure detection box.

[0011] Preferably, a display is provided on the top of the control box, and the display is electrically connected to the controller.

[0012] A leak detection method based on the above-mentioned intelligent constant pressure high-precision leak detector, the specific steps are as follows:

[0013] Step S1: The constant pressure test box performs self-test, and proceeds to the next step after passing the self-test;

[0014] Step S2: placing the test piece in a constant pressure test box and setting it opposite to the fixed electromagnet;

[0015] Step S3: Adjust the gas detection mechanism, adjust the position of the gas detection mechanism according to the size of the object to be tested, close the constant pressure detection box, and control the controller to rotate the plurality of electric shafts so that the gas detection unit of the gas detection mechanism is close to the object to be tested;

[0016] Step S4: Fix the test piece and keep the fixed electromagnet energized;

[0017] Step S5: Start the test, start the vacuum pump to evacuate the constant pressure test box to the set pressure and detect the temperature, humidity, pressure and gas composition in the constant pressure test box at the same time. When the gas probe and the gas sensor on the fixed plate detect the presence of sealed gas, turn off the vacuum pump and open the inflation valve until the pressure in the constant pressure test box reaches the safe pressure. The tested piece fails to pass the test. When the gas probe and the gas sensor on the fixed plate do not detect the presence of sealed gas, the pressure in the constant pressure test box reaches the test pressure, turn off the vacuum pump and maintain the set time. The pressure in the constant pressure test box increases significantly and the tested piece fails to pass the test. There is no significant change in the pressure in the constant pressure test box and the tested piece passes the test.

[0018] Step S6: Open the inflation valve and restore the gas detection mechanism to a vertical state until the pressure in the constant pressure detection box reaches a safe pressure. The fixed electromagnet is powered off, the constant pressure detection box is opened, and the test piece is taken out.

[0019] Preferably, each gas probe of the gas detection mechanism is provided with a number for determining the location of the gas leak.

[0020] Preferably, when the vacuum pump is started, the air pressure of the gas tank is detected in real time. When the pressure in the gas tank reaches the set pressure, the three-way solenoid valve opens the exhaust pipe to directly exhaust the gas.

[0021] Therefore, the present invention adopts the above-mentioned intelligent constant pressure high-precision leak detector and leak detection method, which has the following beneficial effects:

[0022] (1) A gas detection mechanism is installed in the constant pressure test box. Once the gas in the tested piece leaks, it will be detected in time and the gas extraction will be stopped, thus improving the detection efficiency.

[0023] (2) Each gas probe is numbered, and the leak location can be determined by the position of the gas probe, which is simple and convenient to operate.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of an intelligent constant pressure high-precision leak detector of the present invention;

[0026] Figure 2 It is a schematic diagram of the exhaust detection mechanism structure of the present invention.

[0027] Reference numerals

[0028] 1. Constant pressure detection box; 101. Fixed slide; 2. Control box; 3. Gas detection mechanism; 31. Fixed mesh plate; 32. Electric shaft; 33. Gas detection unit; 331. Gas probe; 332. Telescopic rod; 333. Return spring; 334. Limit plate; 4. Fixed electromagnet; 5. Pressure detection mechanism; 6. Exhaust detection mechanism; 61. Fixed plate; 62. Gas sensor; 7. True gas tube; 71. Vacuum valve; 8. Pressure relief valve; 9. Inflating tube; 91. Inflating valve; 10. Display; 11. Vacuum pump; 12. Controller; 13. Gas storage tank; 14. Three-way solenoid valve. DETAILED DESCRIPTION

[0029] Example

[0030] Figure 1 This is a structural diagram of an intelligent constant pressure high-precision leak detector of the present invention. Figure 2 This is a structural diagram of the exhaust detection mechanism of the present invention. As shown in the figure, an intelligent constant pressure high-precision leak detector includes a constant pressure detection box 1 and a control box 2.

[0031] The control box 2 houses a vacuum pump 11, a controller 12, and an air tank 13. The outlet pipe of the vacuum pump 11 is connected to the exhaust pipe and air tank 13 via a three-way solenoid valve 14, enabling gas storage and exhaust operations. The pressure gauge and three-way solenoid valve 14 of the air tank 13 are both connected to the controller 12. When the air pressure in the air tank is insufficient, gas is stored in the air tank 13 during pumping. When the pressure in the air tank 13 is sufficient, the gas is discharged through the exhaust pipe.

[0032] The constant pressure detection box 1 is provided with a fixed electromagnet 4, a gas detection mechanism 3, a pressure detection mechanism 5 and an exhaust detection mechanism 6. The fixed electromagnet 1 is embedded in the bottom of the constant pressure detection box 1 and is used to fix the test piece. It is not limited by the size of the test piece and is convenient for the tester to place the test piece. The constant pressure detection box 1 is connected to the vacuum pump 11 through the vacuum tube 7, and the constant pressure detection box 1 is connected to the gas tank 13 through the inflation tube 9 to achieve rapid vacuuming and inflation of the constant pressure detection box 1. The constant pressure detection box 1 is provided with a pressure relief valve 8. The vacuum valve 71, the inflation valve 91, the pressure relief valve 8, the fixed electromagnet 4, the gas detection mechanism 3, the pressure detection mechanism 5 and the exhaust detection mechanism 6 on the vacuum tube 7 are all electrically connected to the controller 12 to achieve data collection and control of the corresponding solenoid valves.

[0033] The gas detection mechanism 3 is symmetrically provided with two and includes several fixed mesh plates 31, a gas detection unit 33 and an electric rotating shaft 32. The several fixed mesh plates 31 are hinged in sequence through the electric rotating shaft 32. Several through holes are opened on the fixed mesh plate 31. The gas detection unit 33 includes a gas probe 331, a telescopic rod 332, a return spring 333 and a limit plate 334. The limit plate 334 is fixed to one end of the telescopic rod 332, and the other end of the telescopic rod 332 is fixedly connected to the gas probe 331 through the through hole. The return spring 333 is sleeved on the telescopic rod 332, and one end of the return spring 333 is against the fixed mesh plate 31, and the other end of the return spring 333 is against the gas probe 331. A gas sensor and a proximity switch are set in the gas probe 331. When the gas probe 331 approaches the part to be tested, the corresponding electric rotating shaft 32 stops rotating, so that the gas sensor approaches the part to be tested, and the leakage point is quickly and timely discovered. A fixing bar is fixed to the outer end of the fixed mesh plate 31 at one end, and the fixing bar is set in the fixed slide 101 at the bottom of the constant pressure detection box 1. Several fixed slides 101 are set in parallel to facilitate adjusting the position of the gas detection mechanism 3 according to the size of the test piece.

[0034] At least four pressure detection mechanisms 5 are provided to improve the detection accuracy. Several pressure detection mechanisms 5 are fixed in the constant pressure detection box 1. In this embodiment, four pressure detection mechanisms 5 are provided and are respectively arranged at the four corners of the constant pressure detection box 1. The pressure detection mechanism 5 includes a fixed shell, a pressure sensor and a temperature and humidity sensor. The temperature and humidity sensor and the pressure sensor are both fixed in the fixed shell. The temperature and humidity sensor corrects the collected data of the pressure sensor and obtains the temperature in the box at the same time to improve the pressure collection accuracy. The exhaust detection mechanism 6 is arranged opposite to the vacuum tube 7 in the constant pressure detection box 1. The exhaust detection mechanism 6 includes a fixed plate 61 and a gas sensor 62. The gas sensor 62 is fixed on the fixed plate 61. The fixed plate 61 is fixed to the inner wall of the constant pressure detection box 1 and is used to detect whether the extracted gas contains the gas to be measured, thereby improving the detection reliability. A display 10 is provided on the top of the control box 2. The display 10 is electrically connected to the controller 12 and is used to display detection data and collected data.

[0035] A leak detection method based on the above-mentioned intelligent constant pressure high-precision leak detector, the specific steps are as follows:

[0036] Step S1: The constant pressure test box performs self-test. When no test piece is placed in the constant pressure test box 1, the constant pressure test box 1 is evacuated and stops when the set test pressure is reached. If there is no obvious change in pressure within the specified time, it is qualified. After the self-test is qualified, the next step is entered.

[0037] Step S2: The test piece is placed in the constant pressure test box 1 and arranged opposite to the fixed electromagnet 4 .

[0038] Step S3: Adjust the gas detection mechanism 3, adjust the position of the gas detection mechanism 3 according to the size of the test piece, that is, select the corresponding fixed slide 101 to fix the gas detection mechanism 3, close the constant pressure detection box 1, and the controller 12 controls the rotation of several electric shafts 32 so that the gas detection unit 33 of the gas detection mechanism 3 is close to the test piece.

[0039] Step S4 : Fix the test piece and keep the fixed electromagnet 4 energized so that the test piece is adsorbed on the bottom of the constant pressure detection box 1 .

[0040] Step S5: Start the test, start the vacuum pump 11 to evacuate the constant pressure test box 1 to the set pressure and detect the temperature, humidity, pressure and gas composition in the constant pressure test box 1. When any one of the gas probe 331 and the gas sensor on the fixed plate 61 detects the presence of sealed gas, turn off the vacuum pump 11 and open the inflation valve 91 so that the pressure in the constant pressure test box 1 quickly reaches the safe pressure, and the tested piece fails. Each gas probe 331 of the gas detection mechanism 3 is provided with a number for determining the location of the leak. When neither the gas probe 331 nor the gas sensor on the fixed plate 61 detects the presence of sealed gas, the pressure in the constant pressure test box 1 reaches the detection pressure, turn off the vacuum pump 11, and maintain the set time. The pressure in the constant pressure test box 1 increases significantly, and the tested piece fails. There is no significant change in the pressure in the constant pressure test box 1, and the tested piece passes.

[0041] When the vacuum pump 11 is started, the air pressure of the gas tank 13 is detected in real time. When the pressure in the gas tank 13 reaches the set pressure, the three-way solenoid valve 14 opens the exhaust pipe to directly exhaust the gas, so that the gas tank 13 is kept in a high-pressure state in real time.

[0042] Step S6: Open the inflation valve 91 and restore the gas detection mechanism 3 to a vertical state until the pressure in the constant pressure detection box 1 reaches a safe pressure. Then, the fixed electromagnet 4 is powered off, the constant pressure detection box 1 is opened, and the test piece is taken out.

[0043] Therefore, the present invention adopts the above-mentioned intelligent constant pressure high-precision leak detector and leak detection method, which has high detection efficiency and convenient operation, and can also determine the leak location and improve the leak detection accuracy.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An intelligent constant pressure high-precision leak detector, characterized by: It includes a constant pressure detection box and a control box. A vacuum pump, a controller and a gas tank are provided in the control box. The outlet pipe of the vacuum pump is connected to the exhaust pipe and the gas tank through a three-way solenoid valve. The pressure gauge and the three-way solenoid valve of the gas tank are both connected to the controller. When the air pressure in the gas tank is insufficient, the gas is stored in the gas tank during pumping. When the pressure in the gas tank is sufficient, the gas is discharged through the exhaust pipe. The constant pressure detection box is provided with a fixed electromagnet, a gas detection mechanism, a pressure detection mechanism and an exhaust detection mechanism. The constant pressure detection box is connected to the vacuum pump through a vacuum tube, and the constant pressure detection box is connected to the gas storage tank through an inflation tube. The constant pressure detection box is provided with a pressure relief valve. The vacuum valve on the vacuum tube, the inflation valve on the inflation tube, the pressure relief valve, the fixed electromagnet, the gas detection mechanism, the pressure detection mechanism and the exhaust detection mechanism are all electrically connected to the controller; The gas detection mechanism is symmetrically provided with two and includes several fixed mesh plates, a gas detection unit and an electric rotating shaft. The several fixed mesh plates are hinged in sequence through the electric rotating shaft. The fixed mesh plates are provided with several through holes. The gas detection unit includes a gas probe, a telescopic rod, a return spring and a limit plate. The limit plate is fixed to one end of the telescopic rod, and the other end of the telescopic rod passes through the through hole and is fixedly connected to the gas probe. The return spring is sleeved on the telescopic rod, and one end of the return spring abuts against the fixed mesh plate, and the other end of the return spring abuts against the gas probe. The gas probe is provided with a gas sensor and a proximity switch. A fixing strip is fixed to the outer end of the fixed mesh plate at one end, and the fixing strip is arranged in a fixed chute at the bottom of the constant pressure detection box, and a plurality of the fixed chute are arranged in parallel; The fixed electromagnet is embedded in the bottom of the constant pressure detection box and is used to fix the test piece; There are at least four pressure detection mechanisms, each of which is fixed in a constant pressure detection box. The pressure detection mechanism includes a fixed shell, a pressure sensor, and a temperature and humidity sensor. The temperature and humidity sensor and the pressure sensor are both fixed in the fixed shell. The exhaust detection mechanism is arranged opposite to the vacuum tube in the constant pressure detection box. The exhaust detection mechanism includes a fixing plate and a gas sensor. The gas sensor is fixed on the fixing plate, and the fixing plate is fixed to the inner wall of the constant pressure detection box.

2. The intelligent constant pressure high-precision leak detector according to claim 1, characterized in that: A display is provided on the top of the control box, and the display is electrically connected to the controller.

3. A leak detection method based on the intelligent constant pressure high-precision leak detector according to any one of claims 1-2, characterized in that: The specific steps are as follows: Step S1: The constant pressure test box performs self-test, and proceeds to the next step after passing the self-test; Step S2: placing the test piece in a constant pressure test box and setting it opposite to the fixed electromagnet; Step S3: Adjust the gas detection mechanism, adjust the position of the gas detection mechanism according to the size of the object to be tested, close the constant pressure detection box, and control the controller to rotate the plurality of electric shafts so that the gas detection unit of the gas detection mechanism is close to the object to be tested; Step S4: Fix the test piece and keep the fixed electromagnet energized; Step S5: Start the test, start the vacuum pump to evacuate the constant pressure test box to the set pressure and detect the temperature, humidity, pressure and gas composition in the constant pressure test box at the same time. When the gas probe and the gas sensor on the fixed plate detect the presence of sealed gas, turn off the vacuum pump and open the inflation valve until the pressure in the constant pressure test box reaches the safe pressure. The tested piece fails. When the gas probe and the gas sensor on the fixed plate detect no sealed gas and the pressure in the constant pressure test box reaches the test pressure, turn off the vacuum pump and maintain the set time. If the pressure in the constant pressure test box increases significantly, the tested piece fails. If the pressure in the constant pressure test box does not change significantly, the tested piece passes. Step S6: Open the inflation valve and restore the gas detection mechanism to a vertical state until the pressure in the constant pressure detection box reaches a safe pressure. The fixed electromagnet is powered off, the constant pressure detection box is opened, and the test piece is taken out.

4. The leak detection method according to claim 3, characterized in that: Each gas probe of the gas detection mechanism is provided with a number for determining the location of the gas leak.

5. The leak detection method according to claim 3, wherein: When the vacuum pump is started, the air pressure in the gas tank is detected in real time. When the pressure in the gas tank reaches the set pressure, the three-way solenoid valve opens the exhaust pipe to directly exhaust the air.

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