Airtightness detector

Abstract

The utility model relates to an airtightness detector, which comprises a shell, and a single-chip microcomputer, an oxygen sensor, a power supply, a vacuum pump and an alarm which are arranged in the shell, and a display screen is arranged on the shell; wherein the power supply is connected to the single-chip microcomputer through the electric quantity detection circuit, the input end of the electric quantity detection circuit is connected with the power supply, and the output end of the electric quantity detection circuit is connected with the single-chip microcomputer; the vacuum pump is connected to the single-chip microcomputer through the vacuum pump control circuit, the input end of the vacuum pump control circuit is connected with the single-chip microcomputer, and the output end of the vacuum pump control circuit is connected with the vacuum pump. An air outlet of the vacuum pump is connected with an air duct; the oxygen sensor is arranged in the air duct; the oxygen sensor is connected to the single-chip microcomputer through the operational amplifier circuit, the input end of the operational amplifier circuit is connected with the oxygen sensor, and the output end of the operational amplifier circuit is connected with the single-chip microcomputer. The airtightness detector provided by the embodiment of the utility model can be used for detecting leakage points in a low-oxygen sealed environment.

Description

Technical Field

[0001] The present application relates to the technical field of testing instruments, and in particular to an airtightness detector. Background Art

[0002] Typically, pest control is required for precious collections, such as those for cultural relics, books and paintings, Chinese herbal medicines, and tobacco. A common method is nitrogen filling to kill insects. Nitrogen filling and pest control operations require the use of a sealed flexible tent to provide a low-oxygen, sealed environment. When constructing a sealed flexible tent, construction workers will install a sealing and compression device, such as a sealing strip, at the connection between the tent and the ground, thereby enclosing the collection in an independent space. To ensure that there is no nitrogen leakage at the seal during the nitrogen filling and oxygen reduction process, a nitrogen leak test (or airtightness test) is required on the sealing surface of the sealing and compression device.

[0003] Existing airtightness tests typically involve pressure testing. This involves applying a pressure test to the membrane cover after it has been constructed. Depending on the size of the membrane, the test is then performed by observing its expansion for half an hour or an hour to determine if there is a leak. However, this method provides only a rough estimate of leaks and cannot accurately locate smaller leaks, compromising airtightness. Furthermore, since this inability to accurately locate leaks requires re-compacting the entire membrane cover, which is labor-intensive and can compromise the material's sealing properties. Utility Model Content

[0004] In response to the technical problems existing in the prior art, the present application proposes an airtightness detector that can determine the exact location of the leakage point during the airtightness test, so that remedial measures can be implemented accurately.

[0005] The embodiment of the present application proposes an airtightness detector, comprising: a shell and a single-chip microcomputer, an oxygen sensor, a power supply, a vacuum pump and an alarm arranged inside the shell, wherein a display screen is provided on the shell; wherein the power supply is connected to the single-chip microcomputer via a power detection circuit, the input end of the power detection circuit is connected to the power supply, and the output end of the power detection circuit is connected to the single-chip microcomputer; the vacuum pump is connected to the single-chip microcomputer via a vacuum pump control circuit, the input end of the vacuum pump control circuit is connected to the single-chip microcomputer, and the output end of the vacuum pump control circuit is connected to the vacuum pump; the air outlet of the vacuum pump The mouth is connected to a ventilation pipe, and the oxygen sensor is arranged in the ventilation pipe; the oxygen sensor is connected to the single-chip microcomputer through an operational amplifier circuit, the input end of the operational amplifier circuit is connected to the oxygen sensor, and the output end of the operational amplifier circuit is connected to the single-chip microcomputer; the signal output end of the display screen is connected to the signal input end of the single-chip microcomputer, and the display screen is a touch screen for displaying preset information and receiving touch commands; the alarm is connected to the single-chip microcomputer through an alarm control circuit, the input end of the alarm control circuit is connected to the single-chip microcomputer, and the output end of the alarm control circuit is connected to the alarm.

[0006] Optionally, a charging signal detection circuit is further provided between the power supply and the single-chip microcomputer, the input end of the charging signal detection circuit is connected to the power supply, and the output end of the charging signal detection circuit is connected to the single-chip microcomputer.

[0007] Optionally, an analog-to-digital converter is further provided between the oxygen sensor and the single-chip microcomputer, the input end of the analog-to-digital converter is connected to the output end of the operational amplifier circuit, and the output end of the analog-to-digital converter is connected to the single-chip microcomputer, wherein the acquisition accuracy of the analog-to-digital converter is greater than the acquisition accuracy of the single-chip microcomputer.

[0008] Optionally, the airtightness detector further includes a temperature and humidity sensor, a pull-up resistor is provided between the temperature and humidity sensor and the single-chip microcomputer, the input end of the pull-up resistor is connected to the temperature and humidity sensor, and the output end of the pull-up resistor is connected to the single-chip microcomputer.

[0009] Optionally, the power detection circuit includes a diode, a voltage divider resistor is connected in series between an input end of the diode and an output end of the power supply, and the output end of the diode is grounded.

[0010] Optionally, the operational amplifier circuit is a two-stage operational amplifier circuit.

[0011] Optionally, a first capacitor is connected in series between the power supply of the display screen and the display screen, and a second capacitor is connected in series between the power supply of the temperature and humidity sensor and the temperature and humidity sensor.

[0012] Optionally, the preset information includes one or more of the following: battery power, detection environment temperature and humidity, oxygen measurement value, oxygen alarm value and switch icon.

[0013] Optionally, when the air tightness detector is working, the switch icon on the display screen is triggered, the air tightness detector starts, the single-chip microcomputer outputs a driving signal to the vacuum pump through the vacuum pump control circuit, the vacuum pump starts, and the oxygen sensor measures the oxygen content of the test air drawn by the vacuum pump.

[0014] Optionally, the alarm includes an alarm light and a buzzer. When the oxygen sensor detects that the oxygen content in the environment is lower than a preset value, the oxygen sensor sends a signal to the single-chip microcomputer. The single-chip microcomputer outputs an alarm signal to the alarm through the alarm control circuit, and the alarm light starts to flash and the buzzer starts to sound.

[0015] The airtightness detector proposed in the embodiment of the present application is constructed based on a single-chip microcomputer, a vacuum pump, and an oxygen sensor. The overall design of the device is scientific and reasonable. During operation, the vacuum pump extracts the gas in the test environment. The oxygen sensor is installed in the vacuum pump, so that the oxygen content in the gas can be detected. The oxygen sensor is connected to the single-chip microcomputer signal. The reading of the oxygen sensor can be displayed on the display screen of the instrument housing. The single-chip microcomputer is also connected to an alarm. When using the airtightness detector of the embodiment of the present application, when performing an airtightness test on a sealed flexible tent, for example, the oxygen content at various positions can be detected. Once a leak occurs in the sealed flexible tent, the leak point can be accurately located. The entire test process does not require a large amount of manpower. It is simple and efficient, and suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Below, the preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a schematic structural diagram of an airtightness detector according to an embodiment of the present application;

[0018] Figure 2 This is a circuit diagram of the connection between the power supply and the single-chip microcomputer in the airtightness detector of the embodiment of the present application;

[0019] Figure 3 This is a circuit diagram of the connection between the vacuum pump and the single-chip microcomputer in the airtightness detector of the embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the connection between the oxygen sensor and the single-chip microcomputer in the airtightness detector of the embodiment of the present application;

[0021] Figure 5 This is a circuit diagram of the connection between the alarm and the single-chip microcomputer in the airtightness detector of the embodiment of the present application;

[0022] Figure 6 This is a circuit diagram of the connection between the temperature and humidity sensor and the single-chip microcomputer in the airtightness detector of the embodiment of the present application;

[0023] Figure 7 This is a flowchart of the working process of the airtightness detector of the embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100. Airtightness detector; 101. Housing; 102. Oxygen sensor; 103. Vacuum pump; 104. Alarm; 105. Display screen; 106. Ventilation duct; 107. Box body; 201. Power supply terminal; 202. Electricity detection circuit; 2021. Diode; 2022. Voltage divider resistor; 2023. Input of electric quantity detection circuit; 2024. Output of electric quantity detection circuit; 203. Charging signal detection circuit; 2031. Input of charging signal detection circuit; 2032. Output of charging signal detection circuit; 301. Vacuum pump terminal; 302. Vacuum pump control circuit; 3021. Input of vacuum pump control circuit; 3022. Output of vacuum pump control circuit; 401 , the wiring terminals of the oxygen sensor; 402, the two-stage operational amplifier circuit; 4021, the first-stage operational amplifier circuit; 4022, the second-stage operational amplifier circuit; 403, the analog-to-digital converter; 404, the single-chip microcomputer; 501, the wiring terminals of the display screen; 701, the first capacitor; 601, the wiring terminals of the alarm; 602, the alarm control circuit; 6021, the input end of the alarm control circuit; 6022, the output end of the alarm control circuit; 701, the wiring terminals of the temperature and humidity sensor; 702, the pull-up resistor; 7021, the first pull-up resistor; 7022, the second pull-up resistor; 703, the second capacitor; 7021a, the input end of the first pull-up resistor; 7022a, the input end of the second pull-up resistor; 704, the output end of the power supply. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] In the detailed description that follows, reference may be made to the various drawings that form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Each specific embodiment of the present application is described below in sufficient detail to enable a person of ordinary skill in the art to implement the technical solutions of the present application. It should be understood that other embodiments may be utilized or that structural, logical, or electrical changes may be made to the embodiments of the present application.

[0028] The embodiment of the present application provides an airtightness detector, comprising: a housing and a single-chip microcomputer, an oxygen sensor, a power supply, a vacuum pump, and an alarm arranged inside the housing, wherein a display screen is provided on the housing;

[0029] The power supply is connected to the single chip microcomputer via a power detection circuit, the input end of the power detection circuit is connected to the power supply, and the output end of the power detection circuit is connected to the single chip microcomputer;

[0030] The vacuum pump is connected to the single-chip microcomputer via a vacuum pump control circuit, wherein an input end of the vacuum pump control circuit is connected to the single-chip microcomputer, and an output end of the vacuum pump control circuit is connected to the vacuum pump; an air outlet of the vacuum pump is connected to a ventilation pipe, and the oxygen sensor is disposed in the ventilation pipe;

[0031] The oxygen sensor is connected to the single-chip microcomputer via an operational amplifier circuit, the input end of the operational amplifier circuit is connected to the oxygen sensor, and the output end of the operational amplifier circuit is connected to the single-chip microcomputer;

[0032] a signal output terminal of the display screen and a signal input terminal of the single chip microcomputer, wherein the display screen is a touch screen for displaying preset information and receiving touch commands;

[0033] The alarm is connected to the single chip microcomputer via an alarm control circuit, the input end of the alarm control circuit is connected to the single chip microcomputer, and the output end of the alarm control circuit is connected to the alarm.

[0034] The airtightness detector of the embodiment of the present application is constructed based on a single-chip microcomputer, a vacuum pump and an oxygen sensor. The overall design of the device is scientific and reasonable. During operation, the gas in the detection environment is extracted by the vacuum pump. The oxygen sensor is installed in the vacuum pump, so that the oxygen content in the gas can be detected. The oxygen sensor is connected to the single-chip microcomputer signal, and the reading of the oxygen sensor can be displayed on the display screen of the instrument casing. The single-chip microcomputer is also connected to an alarm.

[0035] When using the embodiment of the present application to perform an airtightness test on a low-oxygen sealed environment, such as in a sealed flexible tent, an airtightness detector can be used to continuously detect the oxygen content at multiple points outside the tent. If a gas leak occurs at a certain point, the oxygen content of the gas extracted by the vacuum pump at that point will change. At this time, the airtightness detector can issue an alarm, thereby accurately locating the leak point, making the use process convenient and efficient.

[0036] In some embodiments of the present application, optionally, the oxygen sensor is an O2-C2 oxygen sensor, which has strong anti-interference capabilities for multiple gases, ensuring the authenticity and stability of detection data.

[0037] In some embodiments of the present application, a charging signal detection circuit is optionally provided between the power supply and the single-chip microcomputer, with the input of the charging signal detection circuit connected to the power supply and the output of the charging signal detection circuit connected to the single-chip microcomputer. The addition of a charging signal detection circuit to the airtightness detector can facilitate the user's determination of whether the airtightness detector is in a charging state, preventing misjudgment resulting in the airtightness detector not being charged in a timely manner, thereby affecting its use.

[0038] In some embodiments of the present application, an analog-to-digital converter is optionally provided between the oxygen sensor and the single-chip microcomputer, with the input of the analog-to-digital converter connected to the output of the operational amplifier circuit, and the output of the analog-to-digital converter connected to the single-chip microcomputer. The acquisition accuracy of the analog-to-digital converter is greater than that of the single-chip microcomputer. This greater acquisition accuracy of the analog-to-digital converter enables the single-chip microcomputer to obtain oxygen content with higher accuracy, thereby improving the oxygen content measurement accuracy of the airtightness detector of the present application.

[0039] In some embodiments of the present application, the airtightness detector optionally further includes a temperature and humidity sensor, and a pull-up resistor is provided between the temperature and humidity sensor and the single-chip microcomputer, with the input end of the pull-up resistor connected to the temperature and humidity sensor, and the output end of the pull-up resistor connected to the single-chip microcomputer. By providing the pull-up resistor, an uncertain signal can be clamped to a high level, thereby also providing a current limiting function.

[0040] In some embodiments of the present application, optionally, the power detection circuit includes a diode, a voltage divider resistor is connected in series between the input end of the diode and the output end of the power supply, and the output end of the diode is grounded.

[0041] The diode is set so that the signal can remain stable after passing through the voltage divider resistor, so that the microcontroller receives a stable signal.

[0042] In some embodiments of the present application, optionally, the operational amplifier circuit is a two-stage operational amplifier circuit.

[0043] In the hardware design, two-stage operational amplifier cascade is used to ensure that the signal is not distorted. The detection data is then transmitted to the microcontroller through a high-precision analog-to-digital conversion chip, and finally the real-time data is displayed on the touch screen.

[0044] In some embodiments of the present application, optionally, a first capacitor is connected in series between the power supply of the display screen and the display screen, and a second capacitor is connected in series between the power supply of the temperature and humidity sensor and the temperature and humidity sensor.

[0045] Connecting a first capacitor in series between the display's power supply and the display screen can filter the output signal of the power supply to ensure that it is a clean signal before entering the display screen. Similarly, connecting a second capacitor in series between the temperature and humidity sensor's power supply and the temperature and humidity sensor can also filter the output signal of the power supply to ensure that it is a clean signal before entering the temperature and humidity sensor.

[0046] In some embodiments of the present application, optionally, the preset information includes one or more of the following: battery power, detection environment temperature and humidity, oxygen measurement value, oxygen alarm value, and switch icon.

[0047] By displaying the above preset information on the display screen, the user can intuitively see the relevant information of the airtightness detector and various measurement values. In addition, the switch icon displayed on the display screen can also be used as the switch of the vacuum pump, reducing the use of the switch button.

[0048] In some embodiments of the present application, optionally, when the air tightness detector is working, the switch icon on the display screen is triggered, the air tightness detector starts, the single-chip microcomputer outputs a driving signal to the vacuum pump through the vacuum pump control circuit, the vacuum pump starts, and the oxygen sensor measures the oxygen content of the test air drawn by the vacuum pump.

[0049] In some embodiments of the present application, after the switch icon is triggered, the single chip microcomputer controls the vacuum pump to turn on, and the oxygen sensor determines whether the detection location is a leak point by measuring the oxygen content of the detection air extracted by the vacuum pump.

[0050] In some embodiments of the present application, optionally, the alarm includes an alarm light and a buzzer. When the oxygen sensor detects that the oxygen content in the environment is lower than a preset value, the oxygen sensor sends a signal to the single-chip microcomputer. The single-chip microcomputer outputs an alarm signal to the alarm through the alarm control circuit, and the alarm light starts to flash and the buzzer starts to sound.

[0051] In this application, the alarm can not only emit light signals, but also emit buzzer sounds, which can promptly remind users that a low oxygen content is detected at that location. The staff can determine that the location is a leak point based on the oxygen content.

[0052] The above describes the implementation and technical advantages of the airtightness detector of the present application through multiple embodiments. The following describes the structure and use of the airtightness detector with reference to specific examples.

[0053] Figure 1 This is a schematic diagram of the structure of an airtightness detector according to an embodiment of the present application. Figure 1 As shown, the airtightness detector 100 includes: a shell 101 and a single-chip microcomputer (not shown in the figure) arranged inside the shell 101, an oxygen sensor 102, a power supply (not shown in the figure), a vacuum pump 103, a temperature and humidity sensor 108 and an alarm 104. A display screen 105 is provided on the shell 101, and the air outlet of the vacuum pump 103 is connected to the ventilation pipe 106. The oxygen sensor 102 is arranged in the ventilation pipe 106. When the vacuum pump 103 is turned on, the vacuum pump draws the air in the detection environment into the ventilation pipe 106. The oxygen sensor 102 detects the oxygen content of the gas in the ventilation pipe 106 and displays it through the display screen 105. The single-chip microcomputer and the power supply are encapsulated in the box body 107.

[0054] Figure 2 This is a circuit diagram of the connection between the power supply and the single chip microcomputer in the airtightness detector of the embodiment of the present application. Figure 2 As shown, the power supply is connected to the single-chip microcomputer through the power detection circuit 202, the input terminal 2023 of the power detection circuit 202 is connected to the power supply, and the output terminal 2024 of the power detection circuit 202 is connected to the corresponding pin of the single-chip microcomputer. In some embodiments of the present application, optionally, a charging signal detection circuit 203 is further provided between the power supply and the single-chip microcomputer, the input terminal 2031 of the charging signal detection circuit 203 is connected to the power supply, and the output terminal 2032 of the charging signal detection circuit 203 is connected to the corresponding pin of the single-chip microcomputer. Optionally, the power detection circuit 202 includes a diode 2021, and a voltage divider resistor 2022 is connected in series between the input terminal of the diode 2021 and the output terminal of the power supply, and the output terminal of the diode 2021 is grounded. In some embodiments of the present application, optionally, the power supply is powered by an 11.4V lithium battery.

[0055] Figure 3 This is a circuit diagram of the connection between the vacuum pump and the single chip microcomputer in the airtightness detector of the embodiment of the present application. Figure 1 and Figure 3As shown, the vacuum pump 103 is connected to the single-chip microcomputer via the vacuum pump control circuit 302. The input terminal 3021 of the vacuum pump control circuit 302 is connected to the corresponding pin of the single-chip microcomputer, and the output terminal 3022 of the vacuum pump control circuit is connected to the vacuum pump 103. In some embodiments of the present application, the vacuum pump in the airtightness detector is optionally composed of a micro vacuum pump and a control circuit. When it is necessary to detect whether there is a leak at a certain location, the pump switch icon on the touch screen is clicked. After the single-chip microcomputer receives the feedback signal from the touch screen, it outputs a high level from pin 52, turning on the air pump through the drive circuit.

[0056] Figure 4 This is a schematic diagram of the connection between the oxygen sensor and the single chip microcomputer in the airtightness detector of the embodiment of the present application. Figure 1 and Figure 4 As shown, the oxygen sensor 102 is connected to the single-chip computer 404 through a two-stage operational amplifier circuit 402 and a high-precision analog-to-digital converter 403, wherein the two-stage operational amplifier circuit 402 includes a first-stage operational amplifier circuit 4021 and a second-stage operational amplifier circuit 4022. The input end of the first-stage operational amplifier circuit 4021 is connected to the connection terminal 401 of the oxygen sensor, the output end of the first-stage operational amplifier circuit 4021 is connected to the input end of the second-stage operational amplifier circuit 4022, the output end of the second-stage operational amplifier circuit 4022 is connected to the input end of the analog-to-digital converter 403, and the output end of the analog-to-digital converter 403 is connected to the corresponding pin of the single-chip computer 404.

[0057] In some embodiments of the present application, optionally, the signal output terminal of the display screen is connected to the signal input terminal of the single-chip microcomputer, and a first capacitor is connected in series between the power supply of the display screen and the display screen. The display screen is a touch screen for displaying preset information and receiving touch commands. In some embodiments of the present application, optionally, the preset information includes one or more of the following: battery power, detection environment temperature and humidity, oxygen measurement value, oxygen alarm value and switch icon. In the present application, the oxygen content threshold can also be set through the display screen. When the oxygen content detected by the oxygen sensor is lower than this threshold, the alarm can issue an alarm signal.

[0058] Figure 5 This is a circuit diagram of the connection between the alarm and the single chip microcomputer in the airtightness detector of the embodiment of the present application. Figure 1 and Figure 5As shown, the alarm 104 is connected to the microcontroller via the alarm control circuit 602. The input terminal 6021 of the alarm control circuit 602 is connected to the corresponding pin of the microcontroller, and the output terminal 6022 of the alarm control circuit 602 is connected to the alarm 104. Optionally, when the airtightness detector is in operation, the switch icon on the display screen is triggered, the airtightness detector starts, the microcontroller outputs a drive signal to the vacuum pump via the vacuum pump control circuit, the vacuum pump starts, and the oxygen sensor measures the oxygen content of the test air drawn by the vacuum pump. Optionally, the alarm includes an alarm light and a buzzer. When the oxygen sensor detects that the oxygen content in the environment is lower than a preset value, the oxygen sensor sends a signal to the microcontroller, which then outputs an alarm signal to the alarm via the alarm control circuit, causing the alarm light to flash and the buzzer to sound.

[0059] Figure 6 This is a circuit diagram of the connection between the temperature and humidity sensor and the single chip microcomputer in the airtightness detector of the embodiment of the present application. Figure 1 and Figure 6 As shown, a pull-up resistor 702 is provided between the temperature and humidity sensor 102 and the single-chip microcomputer, and the pull-up resistor 702 includes a first pull-up resistor 7021 and a second pull-up resistor 7022. The input end 7021a of the first pull-up resistor 7021 is connected to the temperature and humidity sensor, and the output end of the first pull-up resistor 7021 is connected to the corresponding pin of the single-chip microcomputer. The input end 7022a of the second pull-up resistor 7022 is connected to the temperature and humidity sensor, and the output end of the second pull-up resistor 7022 is connected to the corresponding pin of the single-chip microcomputer. In some embodiments of the present application, optionally, a second capacitor 703 is connected in series between the power supply of the temperature and humidity sensor and the temperature and humidity sensor, and the output end 704 of the power supply of the temperature and humidity sensor is connected to the temperature and humidity sensor. In some embodiments of the present application, optionally, the temperature and humidity sensor in the airtightness detector is composed of a high-precision temperature and humidity sensor, and the high-precision temperature and humidity sensor adopts a 3.3V power supply.

[0060] Figure 7 This is a flowchart of the working process of the airtightness detector of the embodiment of the present application. Figure 7 As shown, the working process of the airtightness detector is as follows:

[0061] Step 1: Turn on the computer;

[0062] Step 2: Calibrate the oxygen sensor and determine whether the calibration is qualified. If the calibration fails, replace the sensor; if the calibration is qualified, proceed to step 3;

[0063] Step 3: Turn on the vacuum pump;

[0064] Step 4: Perform leakage detection. If the detected oxygen content is higher than the alarm value (the oxygen content threshold set by the operating display), it is determined that there is no leakage. If the oxygen content is lower than the alarm value, proceed to step 5.

[0065] Step 5: The alarm light flashes and the buzzer sounds;

[0066] Step 6: Confirm the leak point.

[0067] The above embodiments are only used to illustrate the present application and are not intended to limit the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions should also fall within the scope disclosed in the present application.

Claims

1. An airtightness detector, characterized in that: include: The housing includes a single chip microcomputer, an oxygen sensor, a power supply, a vacuum pump, and an alarm. The air outlet of the vacuum pump is connected to a ventilation pipe. The oxygen sensor is arranged in the ventilation pipe. A display screen is provided on the housing. The power supply is connected to the single-chip microcomputer through a power detection circuit, the input end of the power detection circuit is connected to the power supply, and the output end of the power detection circuit is connected to the single-chip microcomputer; the vacuum pump is connected to the single-chip microcomputer through a vacuum pump control circuit, the input end of the vacuum pump control circuit is connected to the single-chip microcomputer, and the output end of the vacuum pump control circuit is connected to the vacuum pump; the oxygen sensor is connected to the single-chip microcomputer through an operational amplifier circuit, the input end of the operational amplifier circuit is connected to the oxygen sensor, and the output end of the operational amplifier circuit is connected to the single-chip microcomputer; the signal output end of the display screen is connected to the signal input end of the single-chip microcomputer, and the display screen is a touch screen for displaying preset information and receiving touch commands; the alarm is connected to the single-chip microcomputer through an alarm control circuit, the input end of the alarm control circuit is connected to the single-chip microcomputer, and the output end of the alarm control circuit is connected to the alarm.

2. The airtightness detector according to claim 1, characterized in that: A charging signal detection circuit is further provided between the power supply and the single chip microcomputer, wherein the input end of the charging signal detection circuit is connected to the power supply, and the output end of the charging signal detection circuit is connected to the single chip microcomputer.

3. The airtightness detector according to claim 1, characterized in that: An analog-to-digital converter is further provided between the oxygen sensor and the single-chip microcomputer. The input end of the analog-to-digital converter is connected to the output end of the operational amplifier circuit, and the output end of the analog-to-digital converter is connected to the single-chip microcomputer. The acquisition accuracy of the analog-to-digital converter is greater than the acquisition accuracy of the single-chip microcomputer.

4. The airtightness detector according to claim 1, characterized in that: The airtightness detector also includes a temperature and humidity sensor. A pull-up resistor is provided between the temperature and humidity sensor and the single-chip microcomputer. The input end of the pull-up resistor is connected to the temperature and humidity sensor, and the output end of the pull-up resistor is connected to the single-chip microcomputer.

5. The airtightness detector according to claim 1, characterized in that: The power detection circuit includes a diode, a voltage dividing resistor is connected in series between the input end of the diode and the output end of the power supply, and the output end of the diode is grounded.

6. The airtightness detector according to claim 1, characterized in that: The operational amplifier circuit is a two-stage operational amplifier circuit.

7. The airtightness detector according to claim 4, characterized in that: A first capacitor is connected in series between the power supply of the display screen and the display screen, and a second capacitor is connected in series between the power supply of the temperature and humidity sensor and the temperature and humidity sensor.

8. The airtightness detector according to claim 1, characterized in that: The preset information includes one or more of the following: battery power, detection environment temperature and humidity, oxygen measurement value, oxygen alarm value and switch icon.

9. The airtightness detector according to claim 7, characterized in that: When the airtightness detector is working, the switch icon on the display screen is triggered, the airtightness detector starts, the single-chip microcomputer outputs a driving signal to the vacuum pump through the vacuum pump control circuit, the vacuum pump starts, and the oxygen sensor measures the oxygen content of the test air drawn by the vacuum pump.

10. The airtightness detector according to claim 1, characterized in that: The alarm includes an alarm light and a buzzer. The oxygen sensor sends a signal to the single chip microcomputer, and the single chip microcomputer outputs an alarm signal to the alarm through the alarm control circuit. The alarm light starts to flash and the buzzer starts to sound.

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