A pressurization method for air tightness detector

Abstract

The present invention is applicable to the technical field of air tightness detection, and provides a pressurizing method for an air tightness detector, the method comprising the following steps: S100, inflating air into a container to be tested, controlling the inflation pressure to be P1, and maintaining the pressure for a time period of T1 after the inflation is completed; S200, adjusting the inflation pressure to P2, and maintaining the pressure for a time period of T2 after the inflation is completed, P1>P2; S300, stopping pressure maintenance, and measuring the pressure drop value within the time period of T3: In the air tightness detection method provided by the present invention, the speed at which the temperature in the container to be tested is reduced during the detection process, thereby reducing the pressure maintenance time, that is, the sum of T1 and T2 is less than the pressure maintenance time in the prior art, thereby improving the detection efficiency of the air tightness detector.

Description

Technical Field

[0001] The invention belongs to the technical field of air tightness detection, and in particular relates to a pressurization method of an air tightness detector. Background Art

[0002] At present, the process of air tightness testing of containers is four steps: pressurization, balance, testing and exhaust. The pressurization period is the process of compressed gas filling the container to be tested through the pressure reducing valve. The existing method is to adjust the pressure regulating valve to the set pressure and then continuously fill the test object. In this process, the gas inside the test object is compressed and generates heat, causing the internal temperature of the test object to rise. The balance period is the time to close the valve to stabilize the internal air pressure of the test object. Because of the influence of temperature rise, it takes time for the test object to naturally cool down to the ambient temperature. As the temperature of the test object decreases, the internal air pressure also tends to stabilize.

[0003] For example, to test a 300ML leak-free stainless steel container, the test pressure is 402kPa, pressurization for 10 seconds, balance for 10 seconds, test for 10 seconds, exhaust for 5 seconds, and the test result of the direct pressure leak detector is 400kPa test pressure and 430Pa leakage pressure. Figure 1 The test pressure and leakage pressure trend graph is shown.

[0004] It can be found that pressurizing the existing airtightness tester will cause heat to be generated inside the test object and the temperature to rise. Therefore, it is necessary to extend the equilibrium time so that the temperature of the container to be tested can drop to the ambient temperature. This results in low detection efficiency of the airtightness tester. Therefore, the present application proposes a pressurization method for an airtightness tester. Summary of the invention

[0005] The invention provides a pressurizing method for an airtightness detector, aiming to solve the problem of low efficiency of current airtightness detection.

[0006] The present invention is implemented as follows: an airtightness detection method for detecting the airtightness of a container comprises the following steps:

[0007] S100, inflate the container to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed;

[0008] S200, adjusting the inflation pressure to P2, maintaining the pressure for T2 after inflation, P1>P2;

[0009] S300, stop maintaining pressure, and measure the pressure drop value within T3 time.

[0010] Preferably, T1>T2.

[0011] Preferably, the method further comprises the following steps:

[0012] S400, exhausting the gas in the container.

[0013] Preferably, in step S100 and step S200, the inflation pressure is adjusted by an electric proportional valve.

[0014] Preferably, in step S300, the pressure drop value is measured by a pressure sensor connected to the container to be tested.

[0015] Preferably, the electrical proportional valve adjustment and the pressure sensor are located on the same gas pipeline.

[0016] Preferably, the gas pipeline is also provided with an electromagnetic control valve for controlling the opening and closing of the gas pipeline.

[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0018] 1. In the air-tightness detection method provided by the present invention, the speed of temperature reduction in the container to be tested can be accelerated during the detection process, thereby reducing the pressure holding time, that is, the sum of T1 and T2 is less than the pressure holding time in the prior art, thereby improving the detection efficiency of the air-tightness detector.

[0019] 2. When the air tightness detection method provided by the present invention is used, during the air tightness detection stage, the pressure change value in the container to be tested is small. Since the air tightness detection method provided by the present invention greatly reduces the temperature in the container to be tested before detection, the influence of temperature on the air tightness detection is greatly reduced, thereby improving the accuracy of the air tightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a pressure variation diagram of air tightness detection in the prior art;

[0021] Figure 2 It is a flow chart of an air tightness detection method provided by the present invention;

[0022] Figure 3 It is a pressurization schematic diagram of an air tightness detection method provided by the present invention;

[0023] Figure 4 It is a pressure variation diagram of an air tightness detection method provided by the present invention;

[0024] Figure 5 The present invention provides a test principle diagram of an air tightness detector. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] The embodiment of the present invention provides an airtightness detection method, such as Figure 2 As shown, the following steps are included:

[0028] S100, inflate the container 5 to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed;

[0029] S200, adjusting the inflation pressure to P2, maintaining the pressure for T2 after inflation, P1>P2;

[0030] S300, stop maintaining pressure, and measure the pressure drop value within T3 time;

[0031] In this embodiment, if Figure 3 As shown, when the container 5 to be tested is inflated for the first time, the gas is compressed in the container 5 to be tested, and the temperature in the container 5 to be tested rises. After the inflation is completed, the pressure is maintained. The first pressure holding time is T1. After the first pressure maintenance is completed, the inflation pressure is controlled to be P2. Since P1 is greater than P2, after the pressure is adjusted, part of the gas in the container 5 to be tested will be discharged. Since the discharged gas takes away part of the heat in the container 5 to be tested, the temperature in the container 5 to be tested is reduced, thereby shortening the time of the second pressure maintenance.

[0032] In the air tightness detection method provided by the present invention, the temperature reduction rate in the container 5 to be tested can be accelerated during the detection process, thereby reducing the pressure holding time, that is, the sum of T1 and T2 is less than the pressure holding time in the prior art, thereby improving the detection efficiency of the air tightness detector.

[0033] In a further preferred embodiment of the present invention, Figure 3As shown, T1>T2;

[0034] In this embodiment, the first pressure-maintaining time is T1, and the second pressure-maintaining time is T2. The first pressure-maintaining time is longer than the second pressure-maintaining time. Since the first inflation pressure P1 is greater than the second inflation pressure P2, during the first inflation, the temperature of the container 5 to be tested during the first inflation is greater than the temperature during the second inflation, so that the pressure of the container 5 to be tested is relatively stable after the first inflation. Therefore, the first pressure-maintaining time T1 is longer than the second pressure-maintaining time T2, which can ensure that the pressure in the container 5 to be tested is stable.

[0035] In a further preferred embodiment of the present invention, the airtightness detection method further comprises the following steps:

[0036] S400, exhausting the gas in the container;

[0037] In this embodiment, after the detection is completed, the gas path connection with the container to be tested 5 is disconnected, so that the gas in the container to be tested 5 is discharged.

[0038] The present invention also discloses an airtightness detection system, comprising:

[0039] An air filling unit, used for filling the container with air;

[0040] A pressure control unit, used to control the inflation pressure and inflation time;

[0041] A pressure detection unit, used to detect a pressure drop value;

[0042] In this embodiment, the gas filling unit fills air into the container 5 to be tested, so as to provide an air source for detecting the air tightness of the container 5 to be tested. In some examples, the gas filling unit may be an air pump.

[0043] The pressure control unit is used to control the pressure of the gas charged into the container 5 to be tested during the test. In some examples, the pressure control unit can be a pressure control valve or a program for controlling the pressure control valve, which is used to control the gas charging pressure and the gas charging time, so that when the gas charging unit charges the container 5 to be tested, the gas charging pressure can be adjusted to P2 after the first pressure maintenance, and then the pressure is maintained again for T2 time;

[0044] The pressure detection unit is used to detect the pressure change value in the container 5 to be tested. After maintaining the pressure at P2 for T2 time, the inflation into the container 5 to be tested is stopped, and the pressure change value in the container 5 to be tested within a preset time is measured, thereby measuring the airtightness of the container 5 to be tested.

[0045] In a further preferred embodiment of the present invention, it also includes:

[0046] An exhaust unit, used to exhaust gas in the container;

[0047] In this embodiment, the exhaust unit may be a pressure relief valve or a connecting device of the container 5 to be tested, which is used to disconnect the pressure supply of the container 5 to be tested, thereby exhausting the gas in the container 5 to be tested.

[0048] In a further preferred embodiment of the present invention, the pressure control unit comprises:

[0049] A pressure regulating module, used for regulating pressure;

[0050] Timing module, used to control the inflation time;

[0051] The present invention also discloses a storage medium on which a computer program (instruction) is stored. When the computer program (instruction) is executed by a processor, the following steps are implemented:

[0052] S100, inflate the container 5 to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed;

[0053] S200, adjusting the inflation pressure to P2, maintaining the pressure for T2 after inflation, P1>P2;

[0054] S300, stop maintaining pressure, and measure the pressure drop value within T3 time;

[0055] In this embodiment, the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc.;

[0056] The processor may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip in some embodiments. The processor is generally used to control the overall operation of the computer device.

[0057] The present invention also discloses an airtightness detector, such as Figure 5 As shown, including:

[0058] shell;

[0059] An electrical proportional valve 1 is provided in the housing for adjusting the inflation pressure;

[0060] A pressure sensor 3 disposed in the housing is used to detect pressure changes;

[0061] A gas pipeline 4 is provided in the housing, the gas pipeline 4 is connected to the electric proportional valve 1 and the pressure sensor 3 in sequence, and is used to connect the gas source 6 and the container to be tested 5;

[0062] A controller, wherein the controller is electrically connected to the electrical proportional valve 1 and the pressure sensor 3, and the controller is configured as follows:

[0063] S100, inflate the container 5 to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed;

[0064] S200, adjusting the inflation pressure to P2, maintaining the pressure for T2 after inflation, P1>P2;

[0065] S300, stop maintaining pressure, and measure the pressure drop value within T3 time;

[0066] In this embodiment, if Figure 5 As shown, when measuring the air tightness of the container 5 to be tested, the two ends of the 4 are connected to the gas source 6 and the container 5 to be tested respectively, and the air tightness measurement program located in the controller is started through the control panel located on the shell. At this time, the controller introduces gas with a pressure of P1 into the container 5 to be tested through the electric proportional valve 1. After the inflation is completed, the controller controls the electric proportional valve 1 to maintain the pressure for a time of T1. After the pressure holding time has passed, the controller controls the electric proportional valve 1 to adjust the gas pressure value to P2. After the inflation is completed, the electric proportional valve 1 is controlled to maintain the pressure for a time of T2. After the pressure holding time has passed, the controller controls the electric proportional valve 1 to close. At this time, the pressure sensor 3 measures the pressure change value within a preset time. The pressure sensor 3 is arranged on the gas pipeline 4 between the electric proportional valve 1 and the container 5 to be tested. The pressure sensor 3 transmits the measured pressure change value to the controller, and then the controller sends it to a display device electrically connected to the controller.

[0067] In a further preferred embodiment of the present invention, Figure 5 As shown, the detector also includes:

[0068] An electromagnetic control valve 2 electrically connected to the controller, for controlling the opening and closing of the gas pipeline 4;

[0069] In this embodiment, when air tightness measurement and pressure measurement are not performed, the controller controls the electromagnetic control valve 2 to close the gas pipeline 4, so that the gas pipeline 4 is disconnected. When the container to be tested is inflated, the controller controls the electromagnetic control valve 2 to open. When the container to be tested 5 is disassembled, the electromagnetic control valve 2 is disconnected.

[0070] In a further preferred embodiment of the present invention, the detector further comprises:

[0071] A pressure relief valve, used to vent the container;

[0072] In this embodiment, the pressure relief valve is arranged on one end of the gas pipeline 4 close to the container to be tested 5, and is used to exhaust the container to be tested 5. When the container to be tested 5 is removed, the pressure relief valve is opened to discharge the gas in the container to be tested 5, so as to prevent the high-pressure gas from injuring the staff when the container to be tested 5 is removed.

[0073] In summary, the present invention provides an airtightness detection method, comprising the following steps:

[0074] S100, inflate the container 5 to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed;

[0075] S200, adjusting the inflation pressure to P2, maintaining the pressure for T2 after inflation, P1>P2;

[0076] S300, stop maintaining pressure, and measure the pressure drop value within T3 time;

[0077] In the airtightness detection method provided by the present invention, the speed of temperature reduction in the container 5 to be tested can be accelerated during the detection process, thereby reducing the pressure holding time, that is, the sum of T1 and T2 is less than the pressure holding time in the prior art, thereby improving the detection efficiency of the airtightness detector;

[0078] like Figure 1 and Figure 4 As shown, when the air tightness detection method provided by the present invention is adopted, during the air tightness detection stage, the pressure change value in the container to be tested 5 is small. Since the air tightness detection method provided by the present invention greatly reduces the temperature in the container to be tested 5 before detection, the influence of temperature on the air tightness detection is greatly reduced, and the accuracy of the air tightness detection is improved.

[0079] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0080] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0081] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A pressurization method for an airtightness detector, used to detect the airtightness of a container, It is characterized in that The following steps are involved: S100, inflate the container to be tested, control the inflation pressure to be P1, and maintain the pressure for T1 after the inflation is completed; S200, adjusting the inflation pressure to P2, and maintaining the pressure for T2 after inflation is completed, P1>P2, the internal pressure of the container to be tested when the inflation pressure is P1 is greater than the pressure of the container to be tested when the inflation pressure is P2, so that when the inflation pressure is P2, the container to be tested discharges the internal air to take away part of the heat in the container to be tested, thereby shortening the pressure holding time, T1>T2; S300, stop maintaining pressure, and measure the pressure drop value within T3 time.

2. A method for pressurizing an airtightness detector as claimed in claim 1, It is characterized in that The following steps are also included: S400: Exhaust the gas in the container.

3. A method for pressurizing an airtightness detector as claimed in claim 1, It is characterized in that In step S100 and step S200, the inflation pressure is adjusted by an electrical proportional valve.

4. A method for pressurizing an airtightness detector as claimed in claim 3, It is characterized in that In step S300, the pressure drop value is measured by a pressure sensor connected to the container to be tested.

5. A method for pressurizing an airtightness detector as claimed in claim 4, It is characterized in that The electrical proportional valve adjustment and the pressure sensor are located on the same gas pipeline.

6. A method for pressurizing an airtightness detector as claimed in claim 5, It is characterized in that The gas pipeline is also provided with an electromagnetic control valve for controlling the opening and closing of the gas pipeline.

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