Method and device for detecting air tightness of harmful gas container

Abstract

The invention relates to the technical field of air tightness detection, and particularly provides an air tightness detection method and device for a harmful gas container. The method comprises the steps that under the condition that a detection gas pipe is connected to a harmful gas container, a detection instruction is responded, and communication of all devices is tested; under the condition that the test of each device is passed, verifying the working state of each device; receiving the detection information in response to the input operation of the detection information after the verification of the working state of each device is completed; controlling each device to detect the harmful gas container according to the detection information; the receiving sensor collects experimental data of the harmful gas container in the detection process and uploads the experimental data to the server. The objective of the invention is to solve the problems of high operation risk, low detection efficiency, easy data tampering and low system safety due to the fact that detection devices need to be manually connected for testing and data recording during the airtightness detection of the harmful gas container in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness detection, and in particular to an airtightness detection method and device for a harmful gas container. Background Art

[0002] In some special occasions, air filters often need to filter and collect harmful components. For example, special air filtration equipment is used in biosafety laboratories and biochemical laboratories to filter toxic and harmful substances and prevent them from escaping and polluting.

[0003] In the related art, since the filtered gas is harmful gas, a harmful gas container can be provided specifically, such as Figure 1 As shown, Figure 1 The harmful gas container is a schematic diagram of the structure of a harmful gas container in the related art, which can be connected to a filter and collect harmful gases. The harmful gas container usually includes an aerosol injection port arranged on the outer surface, an upstream concentration sampling port, a servo motor bracket, a screw and a downstream sampling interface.

[0004] In the related art, the air tightness test of such harmful gas containers often requires the use of existing interfaces or the opening of new interfaces, and the manual connection of air pumps and air pressure detection equipment. This method of manually connecting the test gas circuit has a great risk of causing harmful gas leakage, resulting in exposure risks for operators.

[0005] Moreover, after manually connecting the gas circuit, manual experimental operations and manual data recording are required, which is not only inefficient and prone to errors, but the final recorded data also needs to be read and recorded manually, which is very easy to be tampered with or make mistakes, resulting in reduced reliability of the final experimental results data.

[0006] For the airtightness detection of harmful gas containers in related technologies, it is necessary to manually connect various detection devices to conduct tests and record data. This not only has high operation risks and low detection efficiency, but also the data is easy to be tampered with and the system security is low. No effective solution has been proposed so far. Summary of the invention

[0007] The invention provides a method and device for detecting the airtightness of a harmful gas container, which at least solves the problem that the airtightness detection of harmful gas containers in the related art requires manual connection of various detection devices for testing and recording of data, which not only has high operation risks and low detection efficiency, but also makes data easy to be tampered with and has low system security.

[0008] According to one aspect of an embodiment of the present invention, a method for detecting the air tightness of a harmful gas container is provided, comprising: in a case where a detection air pipe is connected to the harmful gas container, responding to a detection instruction, testing the communication of each device, wherein the each device is connected to the detection air pipe and integrated in a detection box, and is used to perform air tightness detection on the harmful gas container in different detection modes according to control instructions of detection requirements; in a case where the each device passes the test, verifying the working status of each device; after the working status verification of each device is completed, responding to an input operation of the detection information, receiving the detection information, wherein the detection information includes at least one of the following: detection standard, detection pressure, detection time, detection mode; controlling the each device to perform detection action on the harmful gas container according to the detection information; receiving the experimental data of the harmful gas container collected by the sensor during the detection process, and uploading it to a server.

[0009] As an optional embodiment, the various devices are controlled to perform detection actions on the harmful gas container according to the detection information, including: determining a standard parameter threshold for whether the detection is qualified according to a corresponding detection standard; testing the harmful gas container according to the detection pressure and detection time using the corresponding detection mode, wherein the detection mode includes a positive pressure mode and a negative pressure mode; collecting the gas pressure of the harmful gas container within the detection time at a corresponding collection frequency, and comparing it with the standard parameter threshold to determine whether the harmful gas container has passed the detection.

[0010] As an optional embodiment, the harmful gas container is tested according to the detection pressure and the detection time using the corresponding detection mode, including: inflating or deflating the harmful gas container according to the corresponding detection mode, and monitoring the air pressure and temperature of the harmful gas container when the air pressure of the harmful gas container reaches the air pressure required for the test; when the air pressure and temperature are maintained within the corresponding preset numerical range for a preset time, executing the steps of collecting the air pressure of the harmful gas container within the detection time at a corresponding collection frequency, comparing with the standard parameter threshold, and determining whether the harmful gas container has passed the detection; when the air pressure and temperature are not maintained within the corresponding preset numerical range for a preset time, determining that the harmful gas container has failed the detection.

[0011] As an optional embodiment, when the detection mode is a positive pressure detection mode, the standard parameter threshold includes a maximum value of a first leakage rate, and the gas pressure required for the test is a preset multiple of the maximum operating pressure of the gas source, wherein the maximum value of the first leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows: , where Q max1is the maximum value of the first leakage rate, α is the corresponding maximum leakage coefficient, V is the volume of the harmful gas container, and t is time; collecting the air pressure of the harmful gas container within the detection time according to the corresponding collection frequency, and comparing it with the standard parameter threshold to determine whether the harmful gas container has passed the detection, including: collecting the air pressure of the harmful gas container according to the corresponding collection frequency; obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure; calculating the first leakage rate according to the calculation formula: , where Q m is the first leakage rate, P is the gas pressure in the harmful gas, V is the volume of the harmful gas container, T is the temperature in the harmful gas, R is the gas constant, t1 is the time in minutes; when the first leakage rate is less than the maximum value of the first leakage rate, it is determined that the detection is passed.

[0012] As an optional embodiment, when the detection mode is a negative pressure detection mode, the standard parameter threshold includes a maximum value of a second leakage rate, and the gas pressure required for the test is less than the atmospheric pressure of the test environment by a preset pressure; wherein the maximum value of the second leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows: , where Q max2 is the maximum value of the second leakage rate, β is the corresponding maximum leakage coefficient; collecting the air pressure of the harmful gas container within the detection time according to the corresponding collection frequency, and comparing it with the standard parameter threshold to determine whether the harmful gas container has passed the detection, including: collecting the air pressure of the harmful gas container according to the corresponding collection frequency; obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure; calculating the second leakage rate according to the calculation formula: , where Q f is the second leakage rate, t2 is the time in hours; P1 is the initial absolute pressure of the harmful gas container, P n is the final absolute pressure of the harmful gas container, the absolute pressure is the external environment pressure minus the negative pressure, T1 is the initial temperature, T n is the end temperature; when the second leakage rate is less than the maximum value of the second leakage rate, it is determined that the test is passed.

[0013] As an optional embodiment, the experimental data of the harmful gas container during the sensor collection and detection process is received and uploaded to the server, including: receiving the experimental data of the harmful gas container during the sensor collection and detection process; transmitting the experimental data to a host computer, and displaying it through the test software of the host computer; displaying corresponding pages and data according to the permissions of the account that has successfully verified the login, and providing operation controls corresponding to the permissions for the displayed pages and data; transmitting the experimental data to the server, and storing it through the anti-tampering strategy of the server.

[0014] According to another aspect of an embodiment of the present invention, there is also provided an air tightness detection device for a harmful gas container, comprising: a box body, a detection air pipe; the box body is integrated with an air path system and a circuit system; the air path system comprises an air source, and an air path pipeline led from the air source; the air path pipeline comprises a positive pressure pipeline and a negative pressure pipeline; the air path pipeline is provided with air path equipment, and the air path equipment comprises at least one of the following: a pressure gauge, a passage valve, and a pressure regulating valve; the air path pipeline is also connected to the detection air pipe; the circuit system comprises a power supply, and circuit equipment, the power supply is used to power the circuit equipment and the air path equipment, and the circuit equipment comprises at least one of the following: a controller, a sensor, a display, and a communication device; the detection air pipe is also connected to the harmful gas container to be detected.

[0015] As an optional embodiment, the positive pressure pipeline includes: an air source air intake branch and a container air intake branch; the input end of the air source air intake branch is provided with a muffler and a first filter, which are used to allow the air outside the container to enter the air source air intake branch through the muffler and then be transmitted to the air source, and the first filter is used to filter the harmful gas leaked to the air source and leaked to the external environment; the container air intake branch is provided with an air pump, a first pressure regulating valve, a pressure sensor and a pressure gauge, which are used to inflate the harmful gas container according to the required air pressure, and the pressure gauge is used to display the pressure of the container air intake branch when the pressure value of the pressure sensor does not exceed the preset difference. to characterize the pressure of the harmful gas container; the negative pressure pipeline includes: an air source outlet branch and a container outlet branch; the output end of the air source outlet branch is provided with a second filter for filtering the harmful gas inside the container and releasing it to the external environment; the container outlet branch is provided with the air pump, the second pressure regulating valve, the pressure sensor and the pressure gauge, the air pump is a positive and negative pressure integrated air pump, for evacuating the harmful gas container according to the required air pressure, and the pressure gauge is used to display the pressure of the container inlet branch when the pressure value of the pressure sensor does not exceed a preset difference, so as to characterize the pressure of the harmful gas container.

[0016] As an optional embodiment, an instrument panel is provided on the box body; the display is provided on the instrument panel, and the display includes: a timing display screen, a temperature and humidity display screen, a pressure display screen, and a working status indicator light; the timing display screen is connected to the controller for displaying the test time; the temperature and humidity display screen is connected to the temperature and humidity sensor for displaying the external environment temperature and humidity; the pressure display screen is connected to the pressure gauge or the pressure sensor for displaying the pressure of the container intake branch when the pressure values ​​of the pressure gauge and the pressure sensor do not exceed a preset difference; the working status indicator light is used to display the detection working status, and the detection working status includes: testing, test passed, and test failed.

[0017] As an optional embodiment, the instrument panel is also provided with a gas circuit interface and a circuit interface; the gas circuit interface is connected to the container air inlet branch or the container air outlet branch, and is used to install the detection air pipe during detection; the circuit interface is connected to the circuit of the temperature sensor, and the temperature sensor is used to detect the gas temperature inside the harmful gas container; the circuit and the detection air pipe are integrated in the same pipeline, and the temperature sensor is arranged inside the valve connecting the detection air pipe and the harmful gas container.

[0018] The invention provides a method for testing the air tightness of a harmful gas container. When the detection gas pipe is connected to the harmful gas container, the method responds to the detection instruction and tests the communication of each device to ensure that each device can communicate effectively with the host computer or controller, thereby ensuring the reliability of control on the one hand and the automation and reliability of the final data collection on the other hand. When each device passes the test, the working state of each device is verified to ensure that each device can be prepared for the test in the correct working state.

[0019] After the working status verification of each device is completed, it responds to the input operation of the detection information, receives the detection information, and controls each device to perform detection actions on the harmful gas container according to the detection information. Therefore, the test information can be input according to various test requirements, and the detection device can be controlled to detect the harmful gas container. The sensor collects the experimental data of the harmful gas container during the detection process and uploads it to the server. The entire test process only requires manual connection of the detection air pipe and the harmful gas container. There is no need to manually build the detection air circuit, manually control the detection, or manually record the data.

[0020] This solves the problem that the airtightness detection of harmful gas containers in the related technology requires manual connection of various detection devices for testing and recording of data, which not only has high operation risks and low detection efficiency, but also the data is easy to be tampered with and the system security is low. The technical effect of improving detection efficiency, system security and reliability of detection results, and reducing detection risks is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of a harmful gas container in the related technology.

[0023] Figure 2 It is a flow chart of a method for detecting air tightness of a harmful gas container according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the connection between the harmful gas container and the detection device of the embodiment created by the present invention.

[0025] Figure 4 It is a schematic diagram of the internal structure of the detection device of an embodiment created by the present invention.

[0026] Figure 5 It is a schematic diagram of the front instrument panel of the detection device of the embodiment created by the present invention.

[0027] Figure 6 It is a schematic diagram of the rear instrument panel of the detection device of the embodiment created by the present invention.

[0028] Figure 7 It is a schematic diagram of the detection process of the detection device of the embodiment created by the present invention.

[0029] Figure 8 It is a structural schematic diagram of the electronic device created by the present invention.

[0030] The reference numerals of the above drawings are as follows:

[0031] 1—test head; 2—positive and negative pressure switching solenoid valve; 3—first filter; 4—flow controller; 5—second filter; 6—vacuum valve; 7—pressure gauge; 8—pressure sensor; 9—positive and negative pressure integrated pump; 10—box; 11—test air pipe; 12—timer display; 13—working status indicator light; 14—temperature and humidity display; 15—pressure display; 16—gas line interface; 17—temperature sensor interface; 18—cooling fan; 19—data transmission interface; 20—power interface. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0033] There are relevant national standards for harmful gas testing in related technologies, such as ASME-N510-1989 "Testing of Nuclear Air Handling Systems" and ISO 10648-2:1994 "Sealed Chambers Part 2: Sealing Classification and Test Methods". This means that there will be relevant regulations for some testing conditions and test parameters.

[0034] In the related technology, each independent detection device is connected to the container to be tested, the data is observed in real time and recorded manually, and finally the recorded data is used for manual calculation to obtain the result. Problems with this technology: The test time is long. Since all instruments are manually connected, the test operation time is extremely long. Professionals are required. Since the records and calculations must meet the requirements of the standards, the inspectors need to be trained. Calculations are prone to errors. The calculations are manual and there are many values ​​involved, so calculation errors are prone to occur. Safety is poor. Since the equipment to be tested usually needs to handle certain hazardous gases, manual connection and personnel being near the equipment for a long time are dangerous. If the operation is improper, it is easy to cause occupational exposure risks.

[0035] In order to solve the problem of airtightness detection of harmful gas containers in the related art, it is necessary to manually connect various detection devices to test and record data, which not only has high operation risks and low detection efficiency, but also data is easy to tamper with and the system security is low. The embodiment created by the present invention provides an airtightness detection method for harmful gas containers.

[0036] Figure 2 Flow chart of a method for detecting air tightness of a harmful gas container according to an embodiment of the present invention, Figure 2 As shown, the air tightness detection method of the harmful gas container comprises the following steps:

[0037] Step S201, in the case where the detection air pipe is connected to the harmful gas container, responding to the detection instruction, testing the communication of each device, wherein each device is connected to the detection air pipe and integrated in the detection box, and is used to perform air tightness detection on the harmful gas container in different detection modes according to the control instruction of the detection requirement;

[0038] Step S202, when each device passes the test, verify the working status of each device;

[0039] Step S203, after the working status of each device is checked, respond to the input operation of the detection information and receive the detection information, wherein the detection information includes at least one of the following: detection standard, detection pressure, detection time, and detection mode;

[0040] Step S204, controlling each device to perform a detection operation on the harmful gas container according to the detection information;

[0041] Step S205, receiving the experimental data of the harmful gas container during the sensor collection and detection process, and uploading it to the server.

[0042] Among them, the airtightness detection method of the harmful gas container provided by the embodiment of the invention is to test the communication of each device by responding to the detection instruction when the detection gas pipe is connected to the harmful gas container, so as to ensure that each device can effectively communicate with the host computer or controller, on the one hand to ensure the reliability of control, and on the other hand to ensure the automation and reliability of the final data collection. And when each device passes the test, the working state of each device is verified to ensure that each device can be prepared for the test in the correct working state.

[0043] After the working status verification of each device is completed, it responds to the input operation of the detection information, receives the detection information, and controls each device to detect the harmful gas container according to the detection information, so that the test information can be input according to various test requirements, and the detection device can be controlled to detect the harmful gas container, and the experimental data of the harmful gas container collected by the sensor during the detection process is received and uploaded to the server. The whole test process only requires manual connection of the detection gas pipe and the harmful gas container, and does not require manual construction of the detection gas circuit, manual control of the detection, and manual recording of data. The technical effect of improving detection efficiency, system safety and reliability of detection results and reducing detection risks has been achieved.

[0044] The execution subject of the above steps can be the controller or host computer of the integrated detection device, which can be controlled by various devices of the circuit detection device and obtain data of various devices or sensors in a timely manner. The specific structure of the above detection device will be described later.

[0045] Before executing the above steps, the detection gas pipe needs to be connected to the harmful gas container. This can be done manually or by a robotic arm in a fixed scenario.

[0046] The above-mentioned harmful gas containers are Figure 1As shown, there are multiple interfaces on the outer surface, and different interfaces have different functions and specifications. The above-mentioned detection air pipe can be directly connected to the existing interface, or a detection interface can be specially set for detection. The detection interface can be blocked by a blocking device at ordinary times, and can be directly opened to connect the detection air pipe through a valve of corresponding specifications during detection.

[0047] When the detection gas pipe is connected to the harmful gas container, the detection start instruction can be issued according to the host computer, detection device, etc. The above-mentioned execution entity can respond to the detection instruction and test the communication of each device to ensure that the detection data can be obtained, calculated, and uploaded to the cloud in time, thereby ensuring the reliability and security of the detection data.

[0048] Each device is connected to the detection gas pipe and integrated in the detection box. It is used to perform air tightness detection on harmful gas containers using different detection modes according to the control instructions of the detection requirements.

[0049] When each device passes the test, check the working status of each device, for example, check whether the air pipe is connected normally, whether the display screen is turned on, etc., to ensure the normal progress of subsequent tests.

[0050] After the working status verification of each device is completed, the test information is received in response to the input operation of the test information. The test information is the information required for the test, which can be recommended by the system by default, can be determined by the user's selection of the test standard, or can be set according to the demand. The test information includes at least one of the following: test standard, test pressure, test time, and test mode.

[0051] According to the detection information, each device is controlled to detect the harmful gas container, mainly controlling the gas path switching, connecting the corresponding gas source to perform the corresponding inflating or exhausting operation. After maintaining the preset time, the sensor data is read at the set frequency, mainly including air pressure and temperature.

[0052] By gradually accumulating the relationship between air pressure changes and time, the final leakage rate is calculated, thereby achieving automatic and rapid detection. There is no need for manual control of detection, reading and recording of data, which improves detection reliability and data accuracy.

[0053] The sensor receives the experimental data of the harmful gas container during the detection process and uploads it to the server. The server can store data through blockchain, which can ensure the security of the experimental data and avoid the possibility of tampering.

[0054] It should be noted that within a usage cycle, the above-mentioned communication test of each device and the verification of the working status of each device only need to be performed once. That is to say, it is not absolutely necessary to test the communication of each device and the verification of the working status of each device for each detection. However, it is necessary to test at a certain frequency to ensure that the communication and working status of each device are ready for detection.

[0055] As an optional embodiment, each device is controlled to perform detection actions on the harmful gas container according to the detection information, including: determining the standard parameter threshold of whether the detection is qualified according to the corresponding detection standard; testing the harmful gas container according to the detection pressure and detection time, wherein the detection mode includes a positive pressure mode and a negative pressure mode; collecting the gas pressure of the harmful gas container within the detection time at a corresponding collection frequency, and comparing it with the standard parameter threshold to determine whether the harmful gas container has passed the detection.

[0056] The above-mentioned testing standards can be industry standards or national standards, which will specify the test conditions and final test parameters. The test conditions may include the pressure at which the test is conducted and the duration.

[0057] Generally speaking, the above detection modes include positive pressure detection and negative pressure detection. The standard parameter is generally the leakage rate, for example, the leakage rate per minute and the leakage rate per hour.

[0058] Whether it is positive pressure detection or negative pressure detection, the principle is similar. The detection is carried out according to the detection pressure and detection time. During the detection process, the air pressure is collected at the set frequency, and the corresponding standard parameters are finally calculated and compared with the standard parameter threshold to determine whether it is qualified. In this way, the purpose of detecting harmful gas containers is achieved.

[0059] As an optional embodiment, a corresponding detection mode is used to test the harmful gas container according to the detection pressure and the detection time, including: inflating or deflating the harmful gas container according to the corresponding detection mode, and monitoring the air pressure and temperature of the harmful gas container when the air pressure of the harmful gas container reaches the air pressure required for the test; when the air pressure and temperature are maintained within the corresponding preset numerical range for a preset time, executing the steps of collecting the air pressure of the harmful gas container within the detection time at a corresponding collection frequency, comparing with the standard parameter threshold, and determining whether the harmful gas container has passed the detection; when the air pressure and temperature are not maintained within the corresponding preset numerical range for a preset time, determining that the harmful gas container has failed the detection.

[0060] In the positive pressure mode, the harmful gas container is inflated according to the detection pressure. When the air pressure of the harmful gas container reaches the required pressure for the test, the air pressure and temperature of the harmful gas container are monitored; when the air pressure and temperature are maintained within the corresponding preset value range for the preset time, the air pressure of the harmful gas container during the detection time is collected according to the corresponding collection frequency, and compared with the standard parameter threshold to determine whether the harmful gas container has passed the detection; when the air pressure and temperature are not maintained within the corresponding preset value range for the preset time, it is determined that the harmful gas container has failed the detection. The details are as follows:

[0061] As an optional embodiment, when the detection mode is a positive pressure detection mode, the standard parameter threshold includes a maximum value of the first leakage rate, and the gas pressure required for the test is a preset multiple of the maximum operating pressure of the gas source, for example, 1.25 times. The first leakage rate may be a leakage rate per minute.

[0062] The maximum value of the first leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows:

[0063]

[0064] In the formula, Q max1 is the maximum value of the first leakage rate, α is the corresponding maximum leakage coefficient, which can be determined in the standard according to the requirements, usually 0.01-0.1, V is the volume of the harmful gas container, and t is the time in minutes;

[0065] The air pressure of the harmful gas container during the detection time is collected according to the corresponding collection frequency, and compared with the standard parameter threshold to determine whether the harmful gas container has passed the detection, including: collecting the air pressure of the harmful gas container according to the corresponding collection frequency; obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure;

[0066] Calculate the first leakage rate according to the calculation formula:

[0067]

[0068] Among them, Q m is the first leakage rate, P is the pressure in the harmful gas, V is the volume of the harmful gas container, T is the temperature in the harmful gas, R is the gas constant, and t1 is the time in minutes;

[0069] In the case where the first leakage rate is less than the maximum value of the first leakage rate, it is determined that the detection is passed.

[0070] Calculation process based on positive pressure standards: Benchmark determination: The entire pressure interface is tested under positive pressure for 15 minutes, and the leakage rate per minute does not exceed 0.0005 CFM / ft3 of the entire equipment volume.

[0071] The inspection procedure is briefly described as follows:

[0072] The pressure decay method is used to evaluate the sealing performance of the tested shell during positive pressure testing. The procedure mainly includes the following steps:

[0073] Selection of test method: First, determine to use the pressure decay method for testing, that is, to monitor the overall pressure interface under positive pressure conditions.

[0074] Calculate the maximum allowable leakage value: By measuring the volume of the device under test and based on relevant standards or requirements, calculate the maximum leakage allowed for the device during the test.

[0075] Install monitoring devices: Install temperature and pressure indicating devices at representative locations of the shell under test to monitor the temperature and pressure changes inside the shell in real time.

[0076] Pressurize to target pressure: Turn on the pressurizing source and pressurize the shell under test until the preset target pressure value is reached.

[0077] Record initial data: Immediately after pressurization is completed, record the initial time, pressure inside the shell, temperature, and atmospheric pressure at that time.

[0078] Continuous Monitoring and Recording: Record the pressure readings inside the shell every minute for at least the next 15 minutes, paying attention to changes in temperature and atmospheric pressure.

[0079] Record final data: At the end of the monitoring, record the final time, pressure inside the shell, temperature, and atmospheric pressure at that time.

[0080] Calculate the leakage rate: Using the collected data, the computer calculates the leakage rate of the tested shell through a specific equation.

[0081] Judgment result: Compare the calculated leakage rate with the maximum allowable leakage value. If the leakage rate does not exceed the maximum allowable value, the shell under test is considered qualified; if the leakage rate exceeds the maximum allowable value, further foam leak detection is required to determine the specific leakage location and cause.

[0082] The following is an example of actual implementation: The specific steps of the positive pressure test process are as follows:

[0083] Determination of the benchmark: The overall pressure interface is tested at a pressure of +2500Pa (10in.wg) for 15 minutes, and the leakage rate per minute does not exceed 0.0005 CFM / ft of the entire equipment volume 3 In practice, customers may require to measure the pressure of 5000Pa and 3750Pa.

[0084] Testing steps:

[0085] Step 1: The pressure decay method is used, that is, the overall pressure interface is tested at a pressure of +2500Pa (10in.wg) for 15 minutes, and the leakage rate of the entire device under test does not exceed 0.0005 CFM / ft per minute 3 Among them, CFM is Cubic Feet per Minute, which means cubic feet per minute, ft 3 Cubic feet is a unit of volume.

[0086] Step 2: Measure the volume of the equipment and calculate the maximum allowable leakage value. α is 0.03. The formula is as follows:

[0087]

[0088] V is the capacity within the test boundary, which is the volume of the above-mentioned harmful gas container, in ft 3 (or m 3 );

[0089] Step 3: Install the temperature and pressure indicating device (i.e. insert a hose with a temperature probe) where the representative temperature and pressure inside the measured shell need to be indicated.

[0090] Step 4: Turn on the pressurization source and run until the pressure reaches 1.25 times the maximum operating pressure. Maintain the pressure constant with the flow control device until the temperature remains within ±0.5℉ (0.25℃) for at least 10 minutes.

[0091] Step 5: Start recording initial time, pressure, temperature and atmospheric pressure.

[0092] Step 6: Record pressure readings every minute for at least 15 minutes.

[0093] Step 7: Record the final time, pressure, temperature, and atmospheric pressure.

[0094] Step 8: Calculate the first leak rate in common units from the following equation:

[0095]

[0096] Among them, Q m is the first leakage rate, P is the pressure in the harmful gas, V is the volume of the harmful gas container, T is the temperature in the harmful gas, R is the gas constant, and t1 is the time in minutes;

[0097] Step 9: If the calculated leakage rate does not exceed the maximum allowable leakage value, it is qualified; if the calculated leakage rate exceeds the maximum allowable leakage value, enter the foam leak detection method for leak detection.

[0098] In negative pressure mode, the harmful gas container is evacuated according to the detection pressure. When the air pressure of the harmful gas container reaches the required pressure for the test, the air pressure and temperature of the harmful gas container are monitored; when the air pressure and temperature are maintained within the corresponding preset value range for the preset time, the air pressure of the harmful gas container during the detection time is collected according to the corresponding collection frequency, and compared with the standard parameter threshold to determine whether the harmful gas container has passed the detection; when the air pressure and temperature are not maintained within the corresponding preset value range for the preset time, it is determined that the harmful gas container has failed the detection. The details are as follows:

[0099] As an optional embodiment, when the detection mode is a negative pressure detection mode, the standard parameter threshold includes the maximum value of the second leakage rate, and the gas pressure required for the test is less than the atmospheric pressure of the test environment by a preset pressure; wherein the maximum value of the second leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows:

[0100]

[0101] In the formula, Q max2 is the maximum value of the second leakage rate, and β is the corresponding maximum leakage coefficient, which can be determined in the standard according to requirements and is usually 0.2-0.5.

[0102] The air pressure of the harmful gas container during the detection time is collected according to the corresponding collection frequency, and compared with the standard parameter threshold to determine whether the harmful gas container has passed the detection, including: collecting the air pressure of the harmful gas container according to the corresponding collection frequency; obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure;

[0103] Calculate the second leakage rate according to the calculation formula:

[0104]

[0105] Among them, Q f is the second leakage rate, t2 is the time in hours; P1 is the initial absolute pressure of the harmful gas container, P n is the final absolute pressure of the harmful gas container, the absolute pressure is the external environment pressure minus the negative pressure, T1 is the initial temperature, T n is the ending temperature.

[0106] In the case where the second leakage rate is smaller than the maximum value of the second leakage rate, it is determined that the detection is passed.

[0107] Based on the negative pressure calculation process: Benchmark determination: The pressure test of the filter sealing surface and the entire system should meet the standard requirements. The entire system should achieve an hourly leakage rate of no more than 0.25% of the system volume under a -1000Pa pressure test, that is, the β value is 0.25.

[0108] The inspection procedure is as follows:

[0109] Prepare measurement tools: Measure the room temperature and atmospheric pressure using a thermometer and barometer placed near the sealed chamber.

[0110] Hanging thermometer: Before closing the opening of the sealed chamber, hang the thermometer for measuring the internal temperature in the center of the chamber.

[0111] Stable conditions: After ensuring that the temperature and pressure inside the sealed chamber and the inspection room are stable, start the leak inspection.

[0112] Adjust the negative pressure: make the negative pressure in the sealed box reach the specified value, and then close the exhaust valve.

[0113] Isolation and measurement: Close the valve to isolate the inside of the sealed chamber from the outside world, and measure the temperature and negative pressure inside the chamber as well as the external atmospheric pressure every 15 minutes for 1 hour.

[0114] The following is an example of actual implementation: The specific steps of the positive pressure test process are as follows:

[0115] Determination benchmark 1: The pressure test of the filter sealing surface and the entire system should comply with the requirements of ISO 10648. The entire system should achieve an hourly leakage rate of no more than 0.25% of the system volume under a -1000Pa pressure test.

[0116] Determination benchmark 2: The pressure test of the filter sealing surface and the entire system should comply with the requirements of ISO 10648. The entire system should achieve an hourly leakage rate of no more than 0.25% of the system volume under a pressure test of -2500Pa.

[0117] Check the valid conditions:

[0118] a) The following conditions should be met within 1 hour of detection time;

[0119] b) The change in relative internal relative pressure must be less than 30% of the initial value;

[0120] c) The temperature change inside the chamber must be less than ±0.3℃;

[0121] d) The change in atmospheric pressure must be less than 100Pa;

[0122] Test steps: During the test, the room temperature and atmospheric pressure are measured with a thermometer and a barometer placed near the sealed chamber. Before the opening of the sealed chamber is finally closed, the thermometer measuring the temperature inside the sealed chamber is hung in the center of the chamber.

[0123] Leakage testing can only begin after the temperature and pressure in the sealed chamber to be tested and the room temperature and air pressure of the test chamber have stabilized.

[0124] Make the negative pressure in the sealed box chamber reach the required value (for acceptance inspection, 1000Pa lower than the external atmospheric pressure; for inspection during use, 250Pa lower than the external atmospheric pressure), and then close the exhaust valve.

[0125] When the pressure and temperature are stable, close the valve to isolate the inside of the sealed chamber from the outside world, measure the temperature and negative pressure inside the sealed chamber and the external atmospheric pressure, once every 15 minutes, for a total of 1 hour.

[0126] The first measurement reading (initial reading 1) and the last measurement reading (end reading 2) are used for calculation, and the remaining intermediate readings are used to control the test conditions.

[0127] As an optional embodiment, experimental data of harmful gas containers during the detection process of sensor collection is received and uploaded to a server, including: receiving experimental data of harmful gas containers during the detection process of sensor collection; transmitting the experimental data to a host computer, and displaying it through the test software of the host computer; displaying corresponding pages and data according to the permissions of the account that has successfully verified the login, and providing operation controls corresponding to the permissions for the displayed pages and data; transmitting the experimental data to the server, and storing it through the server's anti-tampering strategy.

[0128] After receiving the data collected by the sensor, it can be transmitted to the host computer and displayed through the test software. The steps of the above method can also be implemented by the test software.

[0129] The specific method of using the above test software is as follows: first log in to the test software. The program lock will be verified on the verification page of the test software. Please ensure that the encrypted U disk is correctly connected. The encrypted U disk can be connected to the computer / USB expansion device interface to ensure the use and login security of the test software.

[0130] Then log in with your username and password on the login interface (if the developer forgets their password, an engineer needs to manually reset it). If the login fails, a prompt window will be displayed, showing possible reasons for the failure.

[0131] After logging into the test software, the test wizard will be automatically displayed, which is the user guide of the test software. The test wizard includes pre-test preparation and confirmation functions such as communication confirmation, test instrument selection, and test plan. The details are as follows.

[0132] 1. Communication confirmation: Confirm whether the communication is normal. Click [Communication Confirmation], the computer will automatically confirm with the PLC. If everything is normal, the status will be displayed as connected. If the status is displayed as failed, please confirm whether the data transmission line is installed in place and contact the engineer.

[0133] Communication check failure and communication test pass will both display the results in the window.

[0134] 2. Instrument calibration and gas line connection: The counters displayed in the instrument list are entered in advance in "System Settings-Counter Management". Select the instrument within the validity period to proceed to the next step.

[0135] The instrument calibration operation may include the following steps: confirming whether the instrument is powered on, confirming that the instrument display on the instrument panel is normal; confirming that the instruments are within the inspection validity period; confirming that the gas circuit connection between the instrument and the equipment is correct, and confirming that the gas circuit valve of the equipment is in the open state, etc.

[0136] 3. Enter equipment: Select the equipment name (you can name it yourself) and the test standard (select according to the options), fill in the equipment information (including equipment number, equipment volume, production date, etc.) and proceed to the next step.

[0137] For the first use, you need to complete the information input in the instrument and standard management in advance, otherwise the test initialization cannot be completed.

[0138] 4. Basic settings: This page displays the basic information of the test to facilitate better completion of the overall leak test.

[0139] Basic information includes test conditions and equipment information. Test conditions can include test standards and standard test pressure. Equipment information includes equipment name, equipment number, equipment volume, tester (that is, the ID of the login account), test date, test time, etc.

[0140] The test software also includes a test module. After the instrument, program, and equipment preparation are confirmed in the test wizard, the test module is displayed and the test can be performed. The test cannot be performed without completing the 'test wizard'.

[0141] This test module mainly includes the following contents.

[0142] Start test: After entering the test module, click Start Test and the system will test itself according to the settings in the test wizard. According to the test standards, the system has two working modes: positive pressure and negative pressure. There are action prompts at the top of the page when pressurizing and exhausting. After the pressure reaches the test setting value, the pressure holding step will be carried out, and an action prompt will be given at the top of the page.

[0143] The pressure holding time is 10 minutes for 3 times. If the box pressure is not found to be lower than the test set pressure during the 3 tests, the pressure test is performed. It should be noted that the positive or negative pressure mode, as well as the time and method of pressure holding can be set during the initialization process. If not set, the default program can be used.

[0144] After the test is completed, click to view the complete report. You can select the save location of the test report through the window, click and save PDF, select the report save path and other specific operations, and save the report in different storage locations on the host computer or the test software running body.

[0145] The test software can also record historical test records. Display historical test data. Used to manage and trace all testers and corresponding test results. In this interface, the latest report can be placed at the top, and each completed report will be automatically saved here. The report will be archived according to the device number and sorted by the installation test date. The address is "Historical data folder name / device number / file name (test date + serial number)". Click on a specific report to view it and open the historical test report in pdf. Click [Save] to store this test report, click Download, and save it to the specified location.

[0146] The default storage location for the test report is the system default download folder.

[0147] The test software can also perform system settings. Including: user management, used to manage user permissions, add / delete or change user permissions and passwords. The relationship between specific user roles:

[0148] 1. Developer accounts can create manager accounts and operator accounts. Developer accounts are usually owned by the development company and have all other permissions such as adding manager accounts.

[0149] 2. The administrator account can only create operator accounts; the administrator account can add operator accounts, operating system setting modules, and operation test modules. The operator account can only use the operation test module.

[0150] 3. The developer account can delete the administrator account and operator account.

[0151] The test software can also manage instruments, including editing and adding / deleting devices. The information entered into the instrument management is the basis for selecting instruments in the test wizard. If the selection fails, the information can be edited in the instrument management page.

[0152] The test software can also perform standard management, including inputting relevant parameters (positive and negative pressure, pressure value, test time, etc.) according to the test standards to be used.

[0153] The embodiment of the invention also provides a method for detecting the air tightness of a harmful gas container, which is applied to the air tightness detection of a harmful gas container. Optionally, the method for detecting the air tightness of a harmful gas container provided by the embodiment of the invention can be used in the air tightness detection device for the harmful gas container provided by the above embodiment.

[0154] like Figures 3 to 6 As shown, the device comprises: a box body 10, a detection air pipe 11;

[0155] The box body is integrated with an air circuit system and a circuit system; the air circuit system includes an air source and an air circuit pipeline led from the air source; the air circuit pipeline includes a positive pressure pipeline and a negative pressure pipeline; air circuit equipment is arranged on the air circuit pipeline, and the air circuit equipment includes at least one of the following: a pressure gauge, a passage valve, and a pressure regulating valve; the air circuit pipeline is also connected to a detection air pipe; the circuit system includes a power supply and circuit equipment, and the power supply is used to supply power to the circuit equipment and the air circuit equipment, and the circuit equipment includes at least one of the following: a controller, a sensor, a display, and a communication device; the detection air pipe is also connected to a harmful gas container that needs to be detected.

[0156] The air tightness detection device for the above-mentioned harmful gas container provided by the embodiment of the invention responds to the detection instruction and tests the communication of each device when the detection gas pipe is connected to the harmful gas container, so as to ensure that each device can effectively communicate with the host computer or controller, on the one hand to ensure the reliability of control, and on the other hand to ensure the automation and reliability of the final data collection. And when each device passes the test, the working state of each device is verified to ensure that each device can be prepared for the test in the correct working state.

[0157] After the working status verification of each device is completed, it responds to the input operation of the detection information, receives the detection information, and controls each device to detect the harmful gas container according to the detection information, so that the test information can be input according to various test requirements, and the detection device can be controlled to detect the harmful gas container, and the experimental data of the harmful gas container collected by the sensor during the detection process is received and uploaded to the server. The whole test process only requires manual connection of the detection gas pipe and the harmful gas container, and does not require manual construction of the detection gas circuit, manual control of the detection, and manual recording of data. The technical effect of improving detection efficiency, system safety and reliability of detection results and reducing detection risks has been achieved.

[0158] The gas circuit system includes a gas source and a gas circuit pipeline leading from the gas source. The gas source may include an air pump, which can detect harmful gas containers in two working modes: positive and negative pressure.

[0159] Considering the difference between the two working modes, the gas pipeline includes a positive pressure pipeline and a negative pressure pipeline, and provides gas circuit selection for the positive pressure working mode and the negative pressure working mode respectively.

[0160] The gas pipeline is equipped with gas equipment, which includes at least one of the following: pressure gauge, access valve, pressure regulating valve. Different Qilu equipment can choose corresponding products and models according to needs.

[0161] The circuit system includes a power supply and a circuit device. The power supply is used to supply power to the circuit device and the gas circuit device. The circuit device includes at least one of the following: a controller, a sensor, a display, and a communication device.

[0162] Figure 3 Schematic diagram of the connection between the harmful gas container and the detection device according to the embodiment of the present invention. Figure 3 As described above, during detection, the gas path interface 16 on the box body 10 is connected to the detection gas pipe 11, and the other end of the detection gas pipe 11 is connected to the harmful gas container through the test head 1.

[0163] The above detection device has the advantage of more authentic detection data. This is because all test instruments read data in real time through computer software and calculate by the formula built into the software program, so the data is authentic and there is no possibility of falsification. And because the instrument is used to test the leakage rate of the box, double confirmation work was designed during the design, that is, two pressure difference detection systems were designed to compare the data with each other to ensure the reliability of the data.

[0164] And the test is faster: since only one air pipe is needed to be connected to one interface of the device under test, all subsequent tests are controlled and edited by computer software, so there is no need for manual assembly and recording during the test.

[0165] The whole set of equipment is integrated in design and consists of two suitcases, one for the instrument and the other for the main body of the testing equipment, so it is convenient for transportation and handling.

[0166] The test is safe and reliable: The safety of the test is mainly due to the fact that there may be certain dangerous pollutants inside the test box during the test. There is a filter inside the test instrument to filter out the possibly polluted gas and prevent the pollutants from being transmitted to the atmosphere. The detection instrument has weak point and strong electric separation and leakage protection function.

[0167] The sealed chamber of harmful gases can be correctly, efficiently and safely tested for on-site air tightness, and the testing equipment can be accurately controlled by a computer to inflate and evacuate the sealed chamber. At the same time, the device can collect and analyze the data of electronic instruments in real time, and finally accurately judge and automatically obtain the leakage detection results.

[0168] The calculation of air tightness must meet the standards: the entire system should reach a pressure test of -1000Pa (-1000Pa lower limit, can be other negative pressure values), the hourly leakage rate does not exceed 0.25% of the system volume; the overall pressure interface is tested at +2500Pa (10in.wg) (+2500Pa lower limit, can be other positive pressure values) pressure, the test lasts 15 minutes, and the leakage rate per minute does not exceed 0.0005 CFM / ft of the entire equipment volume 3 .

[0169] This detection device can input the box volume through the software, and automatically pressurize / extract the pressure to the target value; monitor the internal temperature of the box in real time and display it; monitor the internal pressure of the box in real time and display it; time in real time and read the internal pressure of the box every minute; when the test time is reached, it will automatically stop and output the test results.

[0170] As an optional embodiment, the positive pressure pipeline includes: an air source air intake branch and a container air intake branch; a muffler and a first filter are provided at the input end of the air source air intake branch, which are used to allow the air outside the container to enter the air source air intake branch through the muffler and then be transmitted to the air source, and the first filter is used to filter the harmful gas leaked into the air source and leaked to the external environment; an air pump, a first pressure regulating valve, a pressure sensor and a pressure gauge are provided on the container air intake branch, which are used to inflate the harmful gas container according to the required air pressure, and the pressure gauge is used to display the container air intake when the pressure value of the pressure sensor does not exceed the preset difference. The pressure of the branch is used to characterize the pressure of the harmful gas container; the negative pressure pipeline includes: an air source outlet branch and a container outlet branch; a second filter is provided at the output end of the air source outlet branch, which is used to filter the harmful gas inside the container and release it to the external environment; an air pump, a second pressure regulating valve, a pressure sensor and a pressure gauge are provided on the container outlet branch, the air pump is a positive and negative pressure integrated air pump, which is used to evacuate the harmful gas container according to the required air pressure, and the pressure gauge is used to display the pressure of the container inlet branch when the pressure value of the pressure sensor does not exceed the preset difference, so as to characterize the pressure of the harmful gas container.

[0171] Figure 4 Schematic diagram of the internal structure of the detection device of the embodiment of the present invention, such as Figure 4 As shown, the box body 10 is internally integrated with a positive and negative pressure switching solenoid valve 2, a first filter 3, a flow controller 4, a second filter 5, a vacuum valve 6, a pressure gauge 7, a pressure sensor 8, and a positive and negative pressure integrated pump 9.

[0172] The positive pressure gas circuit includes: an air source air intake branch and a container air intake branch; a muffler and a first filter 3 are provided at the input end of the air source air intake branch, and the first filter 3 may include a filter and a precision filter of the positive pressure test air circuit, which is used to transmit the air outside the container into the air source air intake branch through the muffler and then to the air source, and the first filter is used to filter the harmful gas leaked to the air source to leak to the external environment. The first filter 3 may be an oil mist separator.

[0173] The container air inlet branch is provided with an air pump, that is, a positive and negative pressure integrated pump 9, a first pressure regulating valve, that is, a flow controller 4, a pressure sensor 8 and a pressure sensor meter, that is, a pressure gauge 7, which are used to inflate the harmful gas container according to the required air pressure. The pressure gauge 7 is used to display the pressure of the container air inlet branch when the pressure value of the pressure sensor 8 does not exceed the preset difference, so as to characterize the pressure of the harmful gas container.

[0174] The negative pressure gas circuit includes: an air source outlet branch and a container outlet branch; a second filter 5 is provided at the output end of the air source outlet branch, which is a precision filter of the negative pressure test gas circuit, and is used to filter harmful gases inside the container and release them to the external environment.

[0175] An air pump, i.e., a positive and negative pressure integrated pump 9, a second pressure regulating valve, i.e., a flow controller 4, a pressure sensor 8 and a pressure gauge 7 are provided on the air outlet branch of the container. The positive and negative pressure integrated air pump 9 is used to evacuate the harmful gas container according to the required air pressure. The pressure gauge 7 is used to display the pressure of the container air inlet branch when the pressure value of the pressure sensor 8 does not exceed the preset difference, so as to characterize the pressure of the harmful gas container.

[0176] It should be noted that part of the positive pressure air circuit and the negative pressure air circuit are shared, and the cost of equipment can be saved and the air circuit can be simplified by merging the air circuits. The positive pressure air circuit and the negative pressure air circuit share the positive and negative pressure integrated pump 9, the pressure sensor meter, and the pressure sensor 8, the positive and negative pressure switching solenoid valve 2, and the vacuum valve 6. The flow controller 4 can be shared by the positive pressure air circuit and the negative pressure air circuit, or the positive pressure air circuit and the negative pressure air circuit can be set separately, which is more convenient to control to meet the different flow requirements of positive and negative pressures, and does not need to be reset after each use.

[0177] The above-mentioned positive and negative pressure integrated pump 9 realizes the function of pressurizing and depressurizing the equipment chamber; the flow controller 4 controls the gas flow; the pressure gauge 7 is a digital pressure differential gauge, a pressure sensor, which displays the pressure situation in the product chamber in real time; the pressure sensor 8 is a pressure differential sensor, which detects the pressure situation in the product chamber and compares it with the digital pressure differential gauge at the same time. If the pressure value is large, it will prompt.

[0178] The positive and negative pressure switching solenoid valve 2 can be a two-position five-way solenoid valve to realize the gas path switching function for air inlet and air outlet; the vacuum valve 6 can be a two-position two-way valve to realize the gas path switching function for air inlet and air outlet.

[0179] The first filter 3 may be an air filter, an oil mist separator, etc., which removes impurities, water (drainage), and oil in the compressed air to prevent terminal pneumatic equipment from malfunctioning, thereby extending its service life.

[0180] The second filter 5 can be a precision filter: that is, a pipeline filter, which prevents the virus in the chamber from being discharged into the atmosphere.

[0181] A muffler can also be provided at the input end of the positive pressure air circuit to eliminate the noise of air intake.

[0182] The gas path sequence for the positive pressure test is: muffler → oil mist separator (first filter 3) → precision filter (to prevent potential viruses from flowing into the atmosphere, also belongs to the first filter 3) → two-position five-way valve (positive and negative pressure switching solenoid valve 2) → positive and negative pressure integrated pump 9 → two-position five-way valve (positive and negative pressure switching solenoid valve 2) → flow controller 4 → two-position two-way valve (vacuum valve 6) → pressure sensor gauge → pressure sensor 8.

[0183] The gas path sequence of the negative pressure test is: pressure sensor 8 → pressure sensor meter (correction & verification of pressure sensor data) → two-position two-way valve (vacuum valve 6) → flow controller 4 → two-position five-way valve (positive and negative pressure switching solenoid valve 2) → positive and negative pressure integrated pump 9 → two-position five-way valve (positive and negative pressure switching solenoid valve 2) → precision filter (to prevent potential viruses from flowing into the atmosphere, which belongs to the second filter 5).

[0184] The exhaust gas path sequence is consistent with the negative pressure test.

[0185] Figure 5 Schematic diagram of the front instrument panel of the detection device of the embodiment of the present invention, Figure 6 Schematic diagram of the instrument panel behind the detection device of the embodiment of the present invention, as shown in FIG. Figure 5 to Figure 6 As shown, as an optional embodiment, an instrument panel is provided on the box body; a display is provided on the instrument panel, and the display includes: a timing display screen 12, a temperature and humidity display screen 14, a pressure display screen 15, and a working status indicator light 13; the timing display screen 12 is connected to the controller for displaying the test time; the temperature and humidity display screen 14 is connected to the temperature and humidity sensor for displaying the external environment temperature and humidity; the pressure display screen 15 is connected to the pressure gauge or the pressure sensor for displaying the pressure of the container intake branch when the pressure values ​​of the pressure gauge and the pressure sensor do not exceed the preset difference; the working status indicator light 13 is used to display the detection working status, and the detection working status includes: testing, test passed, and test failed.

[0186] As an optional embodiment, the instrument panel is also provided with a gas circuit interface 16 and a circuit interface; the gas circuit interface is connected to the container air inlet branch or the container air outlet branch, and is used to install a detection air pipe during detection; the circuit interface is connected to the circuit of the temperature sensor, and the temperature sensor is used to detect the gas temperature inside the harmful gas container; the circuit and the detection air pipe are integrated inside the same pipeline, and the temperature sensor is arranged inside the valve connecting the detection air pipe and the harmful gas container.

[0187] The circuit interface may include a temperature sensor interface 17 and a data transmission interface 19. The corresponding box needs to be provided with a power interface 20 to connect to a power supply.

[0188] Figure 7 Schematic diagram of the detection process of the detection device of the embodiment of the present invention, such as Figure 7 As shown, when testing, first connect the equipment. Mainly connect the air pipe and power / data transmission line to the test equipment box according to the identification plate. The air path uses a 10mm (outer diameter) test air pipe connection.

[0189] The groove inside the temperature sensor plug is aligned with the positioning pin of the socket and then the outer locking ring is rotated to lock it. After the gas circuit connector is tested, the fixing ring is pressed to the bottom and then inserted into the gas circuit interface of the test box. After the connector is connected to the bottom, the fixing ring will automatically pop out and lock.

[0190] When testing the leakage rate, remove the outer diameter ∅10 pipe plug that comes with the box, and connect it to the test box through the outer diameter ∅10 gas line interface. Before connecting the gas pipe, open the ball valve, connect the gas line and the temperature sensor according to the corresponding interface, and make sure that the gas pipe connection is tight and leak-free. After the test is completed, remove the temperature sensor first, then close the test port ball valve and insert the plug.

[0191] The temperature sensor will be partially inserted into the pipe connecting the box. Please ensure that the ball valve is open before installation and during testing. Do not close the ball valve when the temperature sensor is installed to avoid damage.

[0192] It can also be connected to a thermal printer: the power interface and data interface of the thermal printer are at the bottom of the printer. Connect the corresponding connection line according to the corresponding interface. After the test is completed, the test data can be directly printed through the thermal printer and cannot be tampered with.

[0193] The thermal printer can also be connected to the computer via a USB interface. The detection device can have only one communication interface with the computer, connected via a network cable. In theory, it can also have multiple interfaces.

[0194] After clicking Start Test on this test software, the test process cannot be interrupted or skipped, and no other actions can be performed during the test. During the test, you can see the current data by moving the mouse to the line chart area.

[0195] Negative pressure testing needs to be performed in a location where the ambient temperature is relatively stable and the container being tested cannot be directly facing the air outlet of the air conditioner, otherwise the cold air will have a greater impact on the internal pressure of the container, resulting in erroneous test results.

[0196] There is also a test progress window to display the remaining time of the test and the proportion of the test progress. It can also display the test equipment number, the selected test standard and the matching pressure value, the volume of the tested box, the atmospheric pressure and the external ambient temperature at the beginning of the test, as well as the initial and end values ​​of the temperature and the internal and external pressure of the test box and the test results.

[0197] During negative pressure testing, the bottom of the page shows the internal pressure of the test box and the leakage rate per minute. Click the eye icon to display the specific value, and click the text icon to save the data value to the specified location.

[0198] The test software can also evaluate the results: after the test, the system will calculate and give the test results by comparing the leakage rate per minute, and confirm whether the object under test is qualified or unqualified.

[0199] The embodiments of the present invention also provide a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiments of the present invention.

[0200] The embodiments of the present invention further provide a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiments of the present invention.

[0201] The embodiment of the invention also provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor in communication. The memory stores a computer program that can be executed by the at least one processor, and the computer program is used to enable the electronic device to perform the method of the embodiment of the invention when executed by the at least one processor.

[0202] refer to Figure 8, a block diagram of an electronic device that can be used as a server or client of an embodiment of the invention will now be described, which is an example of hardware devices that can be applied to various aspects of the invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or required herein.

[0203] like Figure 8 As shown, the electronic device includes a computing unit 801, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 to a random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the electronic device can also be stored. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0204] Multiple components in the electronic device are connected to the I / O interface 805, including: an input unit 806, an output unit 807, a storage unit 808, and a communication unit 809. The input unit 806 can be any type of device that can input information to the electronic device, and the input unit 806 can receive input digital or character information, and generate key signal input related to user settings and / or function control of the electronic device. The output unit 807 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 808 can include but is not limited to a disk, an optical disk. The communication unit 809 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0205] The computing unit 801 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 801 performs the various methods and processes described above. For example, in some embodiments, the method embodiments created by the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via a ROM 802 and / or a communication unit 809. In some embodiments, the computing unit 801 may be configured to perform the above method in any other appropriate manner (e.g., by means of firmware).

[0206] The computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the computer program, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The computer program can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0207] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0208] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative and not restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0209] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0210] The various steps described in the method implementation methods provided by the embodiments of the present invention can be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0211] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same and similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0212] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of protection. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A method for detecting the air tightness of a harmful gas container, characterized in that: include: When the detection gas pipe is connected to the harmful gas container, respond to the detection instruction and test the communication of each device, wherein each device is connected to the detection gas pipe and integrated in the detection box, and is used to perform airtightness detection on the harmful gas container in different detection modes according to the control instruction of the detection requirement; When each device passes the test, verify the working status of each device; After the working status of each device is checked, respond to the input operation of the detection information and receive the detection information, wherein the detection information includes at least one of the following: detection standard, detection pressure, detection time, and detection mode; Controlling each device to perform a detection action on the harmful gas container according to the detection information; The experimental data of the harmful gas container collected by the sensor during the detection process is received and uploaded to the server.

2. The method according to claim 1, characterized in that Controlling each device to perform a detection action on the harmful gas container according to the detection information includes: Determine the standard parameter threshold value of whether the test is qualified according to the corresponding test standard; According to the detection pressure and the detection time, the harmful gas container is tested using the corresponding detection mode, wherein the detection mode includes a positive pressure mode and a negative pressure mode; The gas pressure of the harmful gas container within the detection time is collected according to the corresponding collection frequency, and compared with the standard parameter threshold to determine whether the harmful gas container has passed the detection.

3. The method according to claim 2, characterized in that According to the detection pressure and the detection time, the harmful gas container is tested using the corresponding detection mode, including: Inflate or evacuate the harmful gas container according to the corresponding detection mode, and monitor the gas pressure and temperature of the harmful gas container when the gas pressure of the harmful gas container reaches the gas pressure required for the test; When the air pressure and temperature are maintained within the corresponding preset value range for a preset time, performing the step of collecting the air pressure of the harmful gas container within the detection time according to the corresponding collection frequency, comparing it with the standard parameter threshold, and determining whether the harmful gas container has passed the detection; When the gas pressure and temperature are not maintained within the corresponding preset value ranges for the preset time, it is determined that the harmful gas container has failed the inspection.

4. The method according to claim 3, characterized in that When the detection mode is a positive pressure detection mode, the standard parameter threshold includes a maximum value of a first leakage rate, and the gas pressure required for the test is a preset multiple of the maximum operating pressure of the gas source, wherein the maximum value of the first leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows: In the formula, Q max1 is the maximum value of the first leakage rate, α is the corresponding maximum leakage coefficient, V is the volume of the harmful gas container, and t is time; Collecting the gas pressure of the harmful gas container within the detection time according to the corresponding collection frequency, and comparing it with the standard parameter threshold, to determine whether the harmful gas container passes the detection, including: Collecting the gas pressure of the harmful gas container according to the corresponding collection frequency; Obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure; The first leakage rate is calculated according to the calculation formula: Among them, Q m is the first leakage rate, P is the pressure of the harmful gas, V is the volume of the harmful gas container, T is the temperature of the harmful gas, R is the gas constant, and t1 is the time in minutes; In the case where the first leakage rate is less than the maximum value of the first leakage rate, it is determined that the detection is passed.

5. The method according to claim 3, characterized in that: When the detection mode is a negative pressure detection mode, the standard parameter threshold includes the maximum value of the second leakage rate, and the gas pressure required for the test is less than the atmospheric pressure of the test environment by a preset pressure; wherein the maximum value of the second leakage rate is calculated based on the volume of the harmful gas container, and the calculation formula is as follows: In the formula, Q max2 is the maximum value of the second leakage rate, and β is the corresponding maximum leakage coefficient; Collecting the gas pressure of the harmful gas container within the detection time according to the corresponding collection frequency, and comparing it with the standard parameter threshold, to determine whether the harmful gas container passes the detection, including: Collecting the gas pressure of the harmful gas container according to the corresponding collection frequency; Obtaining the time, temperature, and atmospheric pressure corresponding to the air pressure; The second leakage rate is calculated according to the calculation formula: Among them, Q f is the second leakage rate, t2 is the time in hours; P1 is the initial absolute pressure of the harmful gas container, P n is the final absolute pressure of the harmful gas container, the absolute pressure is the external environment pressure minus the negative pressure, T1 is the initial temperature, T n is the end temperature; In the case where the second leakage rate is smaller than the maximum value of the second leakage rate, it is determined that the detection is passed.

6. The method according to claim 3, characterized in that Receiving the experimental data of the harmful gas container during the sensor collection and detection process and uploading it to the server, including: Receiving experimental data of the harmful gas container during the sensor collection and detection process; The experimental data is transmitted to a host computer and displayed through the test software of the host computer; According to the permissions of the account that successfully logged in, the corresponding pages and data are displayed, and operation controls corresponding to the permissions are provided for the displayed pages and data; The experimental data is transmitted to a server and stored according to the tamper-proof strategy of the server.

7. A device for detecting the air tightness of a harmful gas container, characterized in that: include: Box, detection air pipe; The box is integrated with a gas circuit system and a circuit system; The gas circuit system includes a gas source and a gas circuit pipeline led from the gas source; the gas circuit pipeline includes a positive pressure pipeline and a negative pressure pipeline; The gas pipeline is provided with gas equipment, and the gas equipment includes at least one of the following: a pressure gauge, a passage valve, and a pressure regulating valve; the gas pipeline is also connected to the detection gas pipe; The circuit system includes a power supply and a circuit device, wherein the power supply is used to supply power to the circuit device and the gas circuit device, and the circuit device includes at least one of the following: a controller, a sensor, a display, and a communication device; The detection gas pipe is also connected to the harmful gas container that needs to be detected.

8. The airtightness detection device for a harmful gas container according to claim 7, characterized in that: The positive pressure pipeline includes: an air source air inlet branch and a container air inlet branch; The input end of the air source intake branch is provided with a muffler and a first filter, which is used to transmit the air outside the container into the air source intake branch through the muffler and then to the air source, and the first filter is used to filter the harmful gas leaked into the air source to leak into the external environment; The container air inlet branch is provided with an air pump, a first pressure regulating valve, a pressure sensor and a pressure gauge, which are used to inflate the harmful gas container according to the required air pressure. The pressure gauge is used to display the pressure of the container air inlet branch when the pressure value of the pressure sensor does not exceed a preset difference, so as to indicate the pressure of the harmful gas container; The negative pressure pipeline includes: an air source outlet branch and a container outlet branch; The output end of the gas source outlet branch is provided with a second filter for filtering harmful gases inside the container and releasing them to the external environment; The air pump, the second pressure regulating valve, the pressure sensor and the pressure gauge are arranged on the air outlet branch of the container. The air pump is an integrated positive and negative pressure air pump for evacuating the harmful gas container according to the required air pressure. The pressure gauge is used to display the pressure of the air inlet branch of the container when the pressure value of the pressure sensor does not exceed a preset difference, so as to characterize the pressure of the harmful gas container.

9. The airtightness detection device for a harmful gas container according to claim 8, characterized in that: The box body is provided with an instrument panel; The instrument panel is provided with the display, which includes: a timing display screen, a temperature and humidity display screen, a pressure display screen, and a working status indicator light; The timing display screen is connected to the controller to display the test time; the temperature and humidity display screen is connected to the temperature and humidity sensor to display the external environment temperature and humidity; the pressure display screen is connected to the pressure gauge or the pressure sensor to display the pressure of the container air inlet branch when the pressure values ​​of the pressure gauge and the pressure sensor do not exceed a preset difference; the working status indicator light is used to display the detection working status, and the detection working status includes: testing, test passed, and test failed.

10. The airtightness detection device for a harmful gas container according to claim 9, characterized in that: The instrument panel is also provided with a gas circuit interface and a circuit interface; The gas circuit interface is connected to the container air inlet branch or the container air outlet branch, and is used to install the detection air pipe during detection; The circuit interface is connected to a circuit of a temperature sensor, and the temperature sensor is used to detect the gas temperature inside the harmful gas container; The circuit and the detection gas pipe are integrated in the same pipeline, and the temperature sensor is arranged in the valve connecting the detection gas pipe and the harmful gas container.

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