A device for detecting the protection time of a gas filter canister

Abstract

A gas filter canister protection time detection device includes a gas filter canister sealing device, an air inlet and an air outlet are arranged on the gas filter canister sealing device, a high concentration sensor, a gas filter canister, and a low concentration sensor are arranged in an internal chamber of the gas filter canister sealing device and between the air inlet and the air outlet, and also includes a first timer and a second timer. The invention can continuously test multiple gas protection times of the gas filter canister, has high test efficiency and accuracy, and can be used for gas filter canister product testing and scientific research on the gas filter canister protection time.

Description

Technical Field

[0001] The invention belongs to the field of poison gas protection and detection products, and specifically refers to a gas filter canister protection time detection device. Background Art

[0002] Conventional gas masks adopt filtering or isolation type, and filter toxic substances in the outside air through the filtering element on the gas mask or the configured gas canister. The protection time of the gas canister of the filtering gas mask is an important indicator of the protection ability of the gas canister. The patent document with authorization announcement number CN204469052U discloses an air supply type gas mask, which consists of a gas mask, an air intake filter, an air intake pipe, and an air compressor. The device uses an air compressor to directly supply air to the gas mask through an air intake hose, which can avoid the shortcomings of gas canister type gas masks leaking and poor protection effect when the concentration of harmful gases in the working environment is very high.

[0003] The patent document with application publication number CN110420505A discloses a failure alarm method for a gas filter and a gas filter, the failure alarm method comprising the following steps: S1, real-time detection of the concentration c of chemical poison gas in the gas entering the air inlet, S2, recording the working time t of the gas filter, S3, real-time detection of the air intake volume q of the gas filter, S4, calculation of the amount of poison gas entering the gas filter according to the concentration c of the poison gas, the working time t and the air intake volume q, and triggering the alarm device to alarm when the amount of poison gas entering the gas filter reaches a preset value S, wherein the preset value S ≤ the maximum absorption amount of the chemical gas filter. This type of prior art is to indicate in real time whether the gas filter has failed and ensure the timeliness of the failure. Summary of the invention

[0004] With respect to the above-mentioned closest prior art, the purpose of the present invention is to provide a device and method for detecting the protection time of a gas filter canister before formal use, so as to better ensure the reliability and usage time of the gas filter canister when it is formally used. At the same time, the present invention compensates for the error caused by the unstable concentration of poisonous gas, thereby improving the detection accuracy compared with the prior art.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A gas filter canister protection time detection device comprises a gas filter canister sealing device, on which an air inlet and an air outlet are arranged, a high concentration sensor, a gas filter canister, a low concentration sensor are arranged in an internal chamber of the gas filter canister sealing device and between the air inlet and the air outlet, and also comprises a first timer and a second timer.

[0007] The first timer is activated after the high-concentration sensor detects poisonous gas, and the second timer is activated after the low-concentration sensor detects poisonous gas.

[0008] It also includes a microcontroller, and a data port of the microcontroller is connected with a high-concentration sensor and a low-concentration sensor.

[0009] When testing the canister protection time, use the following steps:

[0010] 1) Connect the air inlet on the canister sealing device to the poison gas generating device;

[0011] 2) The poison gas enters the sealing device of the gas filter canister through the air inlet, and passes through the high concentration sensor, the gas filter canister, the low concentration sensor in sequence, and is discharged from the air outlet;

[0012] In step 2), when the poison gas reaches the high concentration sensor, the first timer starts to work; when the poison gas reaches the low concentration sensor, the second timer starts to work to obtain the penetration time of the gas filter canister.

[0013] The microcontroller comprises a first microcontroller and a second microcontroller. The data port of the first microcontroller is connected to the high concentration sensor, and the data port of the second microcontroller is connected to the low concentration sensor.

[0014] A valve is provided on the air inlet, and the canister sealing device is divided into a high-concentration sensor sealing device part, a canister sealing device part, and a low-concentration sensor sealing device part from one end to the other end; the high-concentration sensor is arranged in the internal chamber of the high-concentration sensor sealing device part, the canister is arranged in the internal chamber of the canister sealing device part, and the low-concentration sensor is arranged in the internal chamber of the low-concentration sensor sealing device part. A differential pressure measurement point is arranged between the high-concentration sensor sealing device part and the canister sealing device part, a partition is arranged between the low-concentration sensor sealing device part and the canister sealing device part, and the canister is connected to the partition through a canister interface arranged on the partition.

[0015] The data port of the first microcontroller is connected to the first Bluetooth module, and the data port of the second microcontroller is connected to the second Bluetooth module; the first Bluetooth module is interactively connected to the second Bluetooth module, and the first Bluetooth module and the second Bluetooth module can be wirelessly interactively connected to the PC.

[0016] The above-mentioned valve is a solenoid valve, and a digital pressure difference sensor is also provided inside the high-concentration sensor sealing device. The feedback signal of the digital pressure difference sensor is obtained through the first microcontroller to calculate the intake flow rate. The first microcontroller issues a control instruction to regulate the intake valve according to the feedback pressure difference signal and flow setting instruction, thereby realizing intake flow control.

[0017] A method for detecting the front-end protection time of poisonous gas comprises a gas filter canister sealing device, the gas filter canister sealing device is provided with an air inlet and an air outlet, a high concentration sensor, a gas filter canister, and a low concentration sensor are provided in an internal chamber of the gas filter canister sealing device and between the air inlet and the air outlet, and further comprises a first timer and a microcontroller;

[0018] When performing front-end protection time detection, it includes the following steps:

[0019] Step 1: Introduce poison gas of corresponding concentration through the air inlet;

[0020] Step 2: When the poison gas concentration reaches the high concentration sensor, the first timer starts timing, and the high concentration sensor obtains the poison gas intake concentration;

[0021] Step 3: After the poison gas reaches the low concentration sensor through the poison filter canister, the first timer stops timing;

[0022] Step 4: The timing data obtained by the first counter is the front-end protection time;

[0023] In order to make the protection time detected by the device have a unified standard, a test value of the poison gas intake concentration is set in the microcontroller. When there is a deviation between the concentration of the poison gas introduced detected by the high-concentration sensor and the test value, the first timer data is compensated and corrected.

[0024] When compensating and correcting the first timing data, the following steps are adopted:

[0025] Step 1) The microcontroller obtains the timing data of the first timer and the poison gas intake concentration data;

[0026] Step 2) The microcontroller calculates the average value of the poison gas intake concentration over a period of time;

[0027] Step 3) Subtract the average value of the poisonous gas intake concentration data from the poisonous gas intake concentration test value;

[0028] Step 4) The microcontroller adjusts the real-time first timer data according to the sign and size of the calculated value. When the calculated value is positive, the first timer data time of this interval is increased. If the calculated value is larger, the increase is larger. When the calculated value is negative, the first timer data time of this interval is decreased. If the average value of the calculated value is larger, the decrease is larger.

[0029] Step 5) The above steps are repeated, and the microcontroller accumulates the time in each interval of the first timer data until the first timer stops timing.

[0030] A method for detecting the overall protection time of poisonous gas, comprising a gas filter canister sealing device, the gas filter canister sealing device is provided with an air inlet and an air outlet, a high concentration sensor, a gas filter canister, a low concentration sensor are provided in an internal chamber of the gas filter canister sealing device and between the air inlet and the air outlet, and further comprising a first timer and a second timer;

[0031] When performing guard time detection, it includes the following steps:

[0032] Step 1: Introduce poison gas of corresponding concentration through the air inlet;

[0033] Step 2: Get the front-end protection time;

[0034] Step 3: Get the overall protection time;

[0035] In step 2, when the poison gas concentration reaches the high concentration sensor, the first timer starts timing, and the high concentration sensor obtains the poison gas intake concentration; after the poison gas reaches the low concentration sensor through the filter canister, the first timer stops timing; the timing data obtained by the first counter is the front-end protection time;

[0036] In step 3, after the poison gas concentration reaches the low concentration sensor, the first timer stops timing and the second timer starts timing, allowing the poison gas to continue to be delivered through the air inlet. Since there are many types of poison gases, different types of poison gases have different reference penetration concentrations for the gas filter canister. When the low concentration sensor detects that the concentration of the target poison gas continues to rise to the reference penetration concentration, the second timer stops timing, and the timing data obtained by the second counter is the rear-end protection time.

[0037] In order to make the protection time detected by the device have a unified standard, the test value of the poison gas intake concentration is set in the microcontroller. When there is a deviation between the concentration of the poison gas introduced detected by the high-concentration sensor and the test value, the data of the first timer and the second timer are compensated and corrected.

[0038] It also includes a first microcontroller and a second microcontroller, wherein the data port of the first microcontroller is connected to the high concentration sensor, and the data port of the second microcontroller is connected to the low concentration sensor; the data port of the first microcontroller is connected to the first Bluetooth module, and the data port of the second microcontroller is connected to the second Bluetooth module; the first Bluetooth module is interactively connected to the second Bluetooth module;

[0039] In step 3, the following steps are specifically included:

[0040] Step 1): the second microcontroller obtains the compensated and corrected first timer data;

[0041] Step 2): After the second timer starts to work, the second microcontroller calculates the average value of the intake air concentration received by the high-concentration poisonous gas sensor part 1.1;

[0042] Step 3): The second microcontroller subtracts the average value of the poisonous gas intake concentration data of the high-concentration poisonous gas sensor part in the interval from the poisonous gas intake concentration value set in the test;

[0043] Step 4): The second microcontroller adjusts the real-time second timer data according to the sign and size of the calculated value. When the calculated value is positive, the second timer data time of this interval is increased. If the calculated value is larger, the increase is larger; when the calculated value is negative, the second timer data time of this interval is reduced. If the average value of the calculated value is larger, the reduction is larger;

[0044] Step 5): Repeat the above steps, the second microcontroller accumulates the data time in each interval of the second timer until the second timer stops timing;

[0045] Step 6): When the preset penetration concentration of the canister is reached, the second timer stops timing;

[0046] Step 7): The second microcontroller performs addition calculation on the compensated and corrected first timer data and second timer data to obtain accurate protection time.

[0047] The beneficial effects of the present invention are: the present invention has a simple structure, a small size, is easy to operate, has good sealing performance, can accurately determine the protection time of the gas filter canister against a variety of toxic gases, can continuously test the protection time of the gas filter canister under different toxic gas types, temperature and humidity, flow rates and concentration conditions, has high test efficiency, and can be used for gas filter canister product testing and scientific research on the protection time of the gas filter canister. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 It is the overall structural block diagram of the high concentration part circuit in the present invention;

[0051] Figure 3 It is the overall structural block diagram of the low concentration part circuit of the present invention;

[0052] Figure 4 The circuit diagram of the high concentration poison gas sensor part, the first microcontroller and the digital pressure difference sensor of the present invention;

[0053] Figure 5 This is a circuit diagram of the solenoid valve and the first Bluetooth module in the present invention.

[0054] Figure 6 This is a circuit diagram of the first power module in the present invention.

[0055] Figure 7 This is a circuit diagram of the low-concentration poison gas sensor part, the second Bluetooth module, and the second microcontroller in the present invention.

[0056] Figure 8 This is a schematic diagram of the circuit of the second power supply module in the present invention.

[0057] In the figure: high concentration sensor 1, gas filter canister sealing device 2, low concentration sensor 3, high concentration toxic gas sensor part 1.1, first microcontroller 1.2, first Bluetooth module 1.3, first power module 1.4, digital differential pressure sensor 1.5, high concentration sensor sealing device part 2.1, gas filter canister sealing device part 2.2, low concentration sensor sealing device part 2.3, air inlet 2.4, air outlet 2.5, solenoid valve 2.6, gas filter canister interface 2.7, low concentration toxic gas sensor part 3.1, second microcontroller 3.2, second Bluetooth module 3.3, second power module 3.4. DETAILED DESCRIPTION

[0058] A gas filter canister protection time detection device includes a gas filter canister sealing device 2, on which an air inlet 2.4 and an air outlet 2.5 are provided. A high concentration sensor 1, a gas filter canister, and a low concentration sensor 3 are provided in an internal chamber of the gas filter canister sealing device 2 and between the air inlet 2.4 and the air outlet 2.5. The device also includes a first timer and a second timer.

[0059] Furthermore, the poison gas sensor is specifically a poison gas sensor array, the main purpose of which is to be able to detect the protection time of various poison gases (under different poison gas types, the use of a poison gas sensor array can directly measure different types of poison gas sensors without replacing them, which is more efficient than a single poison gas sensor).

[0060] The high-concentration part and the low-concentration part contain MEMS temperature and humidity sensors respectively, which are connected to two microcontrollers respectively to detect the temperature and humidity before and after the gas filter canister and provide temperature and humidity data.

[0061] The first timer is activated after the high concentration sensor 1 detects the poisonous gas, and the second timer is activated after the low concentration sensor 3 detects the poisonous gas.

[0062] It also includes a microcontroller, and a data port of the microcontroller is connected to the high concentration sensor 1 and the low concentration sensor 3.

[0063] When testing the canister protection time, use the following steps:

[0064] 1. Connect the air inlet 2.4 on the canister sealing device 2 to the poison gas generating device;

[0065] 2. The poison gas enters the interior of the canister sealing device 2 through the air inlet 2.4, and passes through the high concentration sensor 1, the canister, and the low concentration sensor 3 in sequence, and is discharged from the air outlet 2.5;

[0066] In step 2, when the poison gas reaches the high concentration sensor 1, the first timer starts to work; when the poison gas reaches the low concentration sensor 3, the second timer starts to work to obtain the penetration time of the gas filter canister.

[0067] The microcontroller includes a first microcontroller 1.2 and a second microcontroller 3.2. The data port of the first microcontroller 1.2 is connected to the high concentration sensor 1, and the data port of the second microcontroller 3.2 is connected to the low concentration sensor 3.

[0068] The data port of the first microcontroller 1.2 is connected to the first Bluetooth module 1.3, and the data port of the second microcontroller 3.2 is connected to the second Bluetooth module 3.3; the first Bluetooth module 1.3 and the second Bluetooth module 3.3 are interactively connected, and the first Bluetooth module 1.3 and the second Bluetooth module 3.3 can be wirelessly interactively connected with the PC.

[0069] Sending a flow setting instruction to the first microcontroller 1.2 via the first Bluetooth module 1.3, thereby realizing wireless control between the sealing device and the outside;

[0070] The two Bluetooth modules communicate with each other, and the first Bluetooth module 1.3 sends the timer data to the second Bluetooth module 3.3 in real time to calculate the accurate penetration time;

[0071] The two Bluetooth modules respectively send timer data, gas sensor, temperature and humidity data and provide parameter modification functions to realize the device Internet of Things.

[0072] The two Bluetooth modules communicate with each other, and the second microcontroller 3.2 obtains the poisonous gas data sent by the first Bluetooth module 1.3 through the second Bluetooth module 3.3. The second microcontroller 3.2 analyzes whether the intake concentration transmitted by Bluetooth (compared with the set intake concentration) is too high or too low, thereby compensating and correcting the timer data to obtain more accurate time, thereby calculating a more accurate protection time.

[0073] A valve is provided on the air inlet 2.4, and the canister sealing device 2 is divided from one end to the other into a high concentration sensor sealing device part 2.1, a canister sealing device part 2.2, and a low concentration sensor sealing device part 2.3; the high concentration sensor is arranged in the internal chamber of the high concentration sensor sealing device part 2.1, the canister is arranged in the internal chamber of the canister sealing device part 2.2, and the low concentration sensor 3 is arranged in the internal chamber of the low concentration sensor sealing device part 2.3. A differential pressure measurement point is arranged between the high concentration sensor sealing device part 2.1 and the canister sealing device part 2.2, and a partition is arranged between the low concentration sensor sealing device part 2.3 and the canister sealing device part 2.2, and the canister is connected to the partition through a canister interface 2.7 arranged on the partition.

[0074] The valve is a solenoid valve 2.6. A digital differential pressure sensor 1.5 is also provided inside the high concentration sensor sealing device part 2.1. The feedback signal of the digital differential pressure sensor is obtained through the first microcontroller 1.2 to calculate the intake flow rate. The first microcontroller 1.2 issues a control instruction to adjust the intake valve according to the feedback differential pressure signal and the flow setting instruction to achieve intake flow control. The toxic gas intake flow rate is an important test condition for the protection time detection of the gas filter canister. The control of the toxic gas intake flow rate has the following purposes:

[0075] 1. Make the device itself have the function of adjusting the gas inlet flow rate of the test condition (generally, it is necessary to rely on other external devices to adjust the flow rate);

[0076] 2. Wireless control via Bluetooth can more conveniently change the gas intake flow.

[0077] A method for detecting the front-end protection time of poisonous gas, comprising a gas filter canister sealing device 2, on which an air inlet 2.4 and an air outlet 2.5 are arranged, in an inner chamber of the gas filter canister sealing device 2 and between the air inlet 2.4 and the air outlet 2.5, a high concentration sensor 1, a gas filter canister, a low concentration sensor 3 are arranged, and further comprising a first timer and a microcontroller;

[0078] When performing front-end protection time detection, it includes the following steps:

[0079] Step 1: introducing poison gas of corresponding concentration through the air inlet 2.4;

[0080] Step 2: When the poison gas concentration reaches the high concentration sensor 1, the first timer starts timing, and the high concentration poison gas sensor 1 obtains the poison gas intake concentration;

[0081] Step 3: After the poison gas reaches the low concentration sensor 1 through the poison filter canister, the first timer stops timing;

[0082] Step 4: The timing data obtained by the first counter is the front-end protection time;

[0083] In order to make the protection time detected by the device have a unified standard, a test value of the poison gas intake concentration is set in the microcontroller. When there is a deviation between the concentration of the poison gas introduced by the high concentration sensor 1 and the test value, the first timer data is compensated and corrected.

[0084] When compensating and correcting the first timing data, the following steps are adopted:

[0085] Step 1) The microcontroller obtains the timing data of the first timer and the poison gas intake concentration data;

[0086] Step 2) The microcontroller calculates the average value of the poison gas intake concentration over a period of time;

[0087] Step 3) Subtract the average value of the poisonous gas intake concentration data from the poisonous gas intake concentration test value;

[0088] Step 4) The microcontroller adjusts the real-time first timer data according to the sign and size of the calculated value. When the calculated value is positive, the first timer data time of this interval is increased. If the calculated value is larger, the increase is larger. When the calculated value is negative, the first timer data time of this interval is decreased. If the average value of the calculated value is larger, the decrease is larger.

[0089] Step 5) The above steps are repeated, and the microcontroller accumulates the data time in each interval of the first timer until the first timer stops timing.

[0090] A method for detecting the overall protection time of poisonous gas comprises a gas filter canister sealing device 2, on which an air inlet 2.4 and an air outlet 2.5 are arranged, a high concentration sensor 1, a gas filter canister, a low concentration sensor 3 are arranged in an internal chamber of the gas filter canister sealing device 2 and between the air inlet 2.4 and the air outlet 2.5, and further comprises a first timer and a second timer; when detecting the protection time, it comprises the following steps:

[0091] Step 1: introducing poison gas of corresponding concentration through the air inlet 2.4;

[0092] Step 2: Get the front-end protection time;

[0093] Step 3: Get the overall protection time;

[0094] In step 2, when the poison gas concentration reaches the high concentration sensor 1, the first timer starts timing, and the microcontroller obtains the test value of the poison gas intake concentration; after the poison gas reaches the low concentration sensor 1 through the filter canister, the first timer stops timing; the timing data obtained by the first counter is the front-end protection time;

[0095] In step 3, after the poison gas concentration reaches the low concentration sensor, the first timer stops timing and the second timer starts timing, so that the poison gas continues to be delivered through the air inlet 2.4. Since there are many types of poison gases, different types of poison gases have different reference penetration concentrations for the gas filter canister. When the low concentration sensor 3 detects that the concentration of the target poison gas introduced continues to rise to the reference penetration concentration, the second timer stops timing, and the timing data obtained by the second counter is the rear-end protection time.

[0096] In order to make the protection time detected by the device have a unified standard, a test value of the poison gas intake concentration is set in the microcontroller. When there is a deviation between the concentration of the poison gas introduced by the high-concentration sensor 1 and the test value, the data of the first timer and the second timer are compensated and corrected.

[0097] It also includes a first microcontroller 1.2 and a second microcontroller 3.2. The first microcontroller 1.2 and the second microcontroller 3.2 have a data port connected to the high concentration sensor 1, and a data port connected to the low concentration sensor 3; the data port of the first microcontroller 1.2 is connected to the first Bluetooth module 1.3, and the data port of the second microcontroller 3.2 is connected to the second Bluetooth module 3.3; the first Bluetooth module 1.3 is interactively connected to the second Bluetooth module 3.3;

[0098] In step 3, the following steps are specifically included:

[0099] Step 1): the second microcontroller 3.2 obtains the compensated and corrected first timer data;

[0100] Step 2): After the second timer starts to work, the second microcontroller 3.2 calculates the average value of the intake air concentration received by the high-concentration poisonous gas sensor part 1.1;

[0101] Step 3): The second microcontroller 3.2 subtracts the average value of the poisonous gas intake concentration data of the high-concentration poisonous gas sensor part 1.1 within the interval (5 seconds) from the poisonous gas intake concentration value set in the test;

[0102] Step 4): The second microcontroller 3.2 adjusts the real-time second timer data according to the sign and size of the subtraction calculation value. When the calculation value is positive, the second timer data time of this interval is increased. If the calculation value is larger, the increase is larger; when the calculation value is negative, the second timer data time of this interval is reduced. If the average value of the calculation value is larger, the reduction is larger;

[0103] Step 5): The above steps are repeated, and the second microcontroller 3.2 accumulates the time in each interval of the second timer data until the second timer stops timing;

[0104] Step 6): When the preset penetration concentration of the canister is reached, the second timer stops timing;

[0105] Step 7): The second microcontroller 3.2 performs addition calculation on the compensated and corrected first timer data and second timer data to obtain accurate protection time.

[0106] The timer can be a timer in a microcontroller or an independent timing circuit such as a 555 timer.

[0107] More specifically, the present invention provides the following embodiments:

[0108] As shown in the figure, a gas filter canister protection time detection device includes a high concentration sensor 1, a gas filter canister sealing device 2, and a low concentration sensor 3. Further, the high concentration sensor 1 includes a high concentration toxic gas sensor part 1.1, a first Bluetooth module 1.3, a first power module 1.4, and a digital pressure difference sensor 1.5; the low concentration sensor 3 includes a low concentration toxic gas sensor part 3.1, a second Bluetooth module 3.3, and a second power module 3.4; the gas filter canister sealing device 2 includes a high concentration sensor sealing device part 2.1, a gas filter canister sealing device part 2.2, a low concentration sensor sealing device part 2.3, an air inlet 2.4, an air outlet 2.5, a solenoid valve 2.6, and a gas filter canister interface 2.7; the microcontroller includes a first microcontroller 1.2 and a second microcontroller 3.2.

[0109] The high concentration gas sensor part 1.1, the first Bluetooth module 1.3, the digital pressure difference sensor 1.5, and the electromagnetic valve 2.6 are respectively connected to the signal end of the first microcontroller 1.2. The first Bluetooth module 1.3 realizes wireless communication with the PC, and is used to realize the air inlet flow control by adjusting the opening of the electromagnetic valve 2.6. The closed-loop control of the electromagnetic valve 2.6 can be realized through the feedback signal of the digital pressure difference sensor 1.5.

[0110] The low concentration poison gas sensor part 3.1 and the second Bluetooth module 3.3 are respectively connected to the signal input end of the second microcontroller 3.2. The second Bluetooth module 3.3 realizes wireless communication with the PC.

[0111] The high concentration sensor sealing device part 2.1, the gas filter canister sealing device part 2.2, the gas filter canister interface 2.7, and the low concentration sensor sealing device part 2.3 are connected in sequence and sealed at each connection port to prevent gas leakage. An air inlet 2.4 is provided on the side of the high concentration sensor sealing device part 2.1, and an air outlet 2.5 is provided on the side of the low concentration sensor sealing device part 2.3. An air inlet solenoid valve 2.6 is provided at the air inlet 2.4. The high concentration sensor 1, the gas filter canister, and the low concentration sensor 3 are respectively built in the high concentration sensor sealing device part 2.1, the gas filter canister sealing device part 2.2, and the low concentration sensor sealing device part 2.3; the gas filter canister interface 2.7 is used to fix the gas filter canister and ensure that the poison gas can only enter the low concentration sensor sealing device part 2.3 through the gas filter canister. A pressure difference measurement point is provided between the high concentration sensor sealing device part 2.1 and the canister sealing device part 2.2, a partition is provided between the low concentration sensor sealing device part 2.3 and the canister sealing device part 2.2, and the canister is connected to the partition via a canister interface 2.7 provided on the partition.

[0112] The first power module 1.4 and the second power module 3.4 provide power to the high concentration sensor 1 and the low concentration sensor 3 respectively.

[0113] Furthermore, the high-concentration poison gas sensor part 1.1 is a high-concentration poison gas sensor array, which contains a filter amplifier circuit unit and an A / D unit, and can detect a higher poison gas concentration range. The types of sensors contained match the types of poison gases protected by the gas filter canister, and can detect multiple poison gases at the same time. The high-concentration poison gas sensor array 1.1 is integrated with a MEMS temperature and humidity sensor.

[0114] Furthermore, the low-concentration poison gas sensor part 3.1 is a low-concentration sensor array, which contains a filter amplifier circuit unit and an A / D unit for detecting a low concentration range. The types of sensors contained match the types of poison gases protected by the gas filter canister, and multiple poison gases can be detected at the same time. The low-concentration poison gas sensor array 3.1 is integrated with a MEMS temperature and humidity sensor.

[0115] Furthermore, the first microcontroller 1.2 and the second microcontroller 3.2 each include an externally connected data storage module.

[0116] Furthermore, the first power module 1.4 and the second power module 3.4 respectively include a rechargeable battery and a voltage conversion module. The rechargeable battery ensures that the sensor can work continuously for a long time without an external power supply.

[0117] Furthermore, the first microcontroller 1.2 is integrated with the high concentration sensor part 1.1, and the second microcontroller 3.2 is integrated with the low concentration sensor part 3.1.

[0118] Furthermore, the solenoid valve 2.6 is a proportional valve.

[0119] The working process / operation method of the present invention is:

[0120] Step 1: Before testing the protection time of the canister, the tester places the canister to be tested into the canister sealing device part 2.2 according to the requirements of the instruction manual, and sequentially connects the high concentration sensor sealing device part 2.1, the canister sealing device part 2.2, the canister interface 2.7, and the low concentration sensor sealing device part 2.3;

[0121] Step 2: When a certain poison gas protection time is detected, poison gas of corresponding concentration is fed in through the air inlet 2.4. When the poison gas reaches the high concentration sensor 1, the first timer starts to work. The high concentration poison gas sensor part 1.1 detects the poison gas intake concentration and temperature and humidity, and then sends the sensor data and the first timer data to the first microcontroller 1.2. The first microcontroller 1.2 wirelessly sends the first timer data, poison gas data and temperature and humidity data to other external devices through the first Bluetooth module 1.3. At the same time, the first Bluetooth module 1.3 communicates with the second Bluetooth module 3.3. The first Bluetooth module 1.3 sends the first timer data and poison gas data to the second Bluetooth module 3.3 in real time, the second microcontroller 3.2 receives and processes the data sent by the first Bluetooth module 1.3 through the second Bluetooth module 3.3, and the second microcontroller 3.2 analyzes whether the poison gas intake concentration data sent by the first Bluetooth module 1.3 (compared with the poison gas intake concentration value set in the test, which is provided to the second microcontroller 3.2 through the second Bluetooth module 3.3) is too high or too low, thereby compensating and correcting the received first timer data to obtain more accurate time, thereby calculating a more accurate protection time.

[0122] When compensating and correcting the received first timer data, the following steps are specifically performed:

[0123] Step 1): The second microcontroller 3.2 receives the first timer data and the poison gas intake concentration data sent by the first Bluetooth module 1.3 through the second Bluetooth module 3.3;

[0124] Step 2): The second microcontroller 3.2 calculates the average value of the poison gas intake concentration data in each interval (10 seconds);

[0125] Step 3): The second microcontroller 3.2 subtracts the average value of the poisonous gas intake concentration data within the interval (10 seconds) from the poisonous gas intake concentration value set in the test;

[0126] Step 4): The second microcontroller 3.2 adjusts the real-time first timer data according to the sign and size of the calculated value. When the calculated value is positive, the first timer data time of this interval is increased. If the calculated value is larger, the increase is larger; when the calculated value is negative, the first timer data time of this interval is decreased. If the average value of the calculated value is larger, the decrease is larger;

[0127] Step 5): The above steps are repeated until the first timer stops timing, and the second microcontroller 3.2 accumulates the data time within the first timer interval.

[0128] Step 3: When the poison gas reaches the low concentration sensor 3 through the gas filter canister, the first timer stops timing and the second timer starts to work. The low concentration poison gas sensor part 3.1 detects the concentration and temperature and humidity of the poison gas intake, and then sends the sensor data and the second timer data to the second microcontroller 3.2. The second microcontroller 3.2 wirelessly sends the second timer data, poison gas data and temperature and humidity data to other external devices through the second Bluetooth module 3.3. The second Bluetooth module 3.3 communicates with the first Bluetooth module 1.3. The second Bluetooth module 3.3 receives the first timer data, poison gas data and temperature and humidity real-time data sent by the first Bluetooth module 1.3. The second microcontroller 3.2 calculates the precise protection time according to the compensated and corrected first timer data and second timer data, that is, obtains the penetration time of the gas filter canister.

[0129] When calculating the precise protection time, the following steps are performed:

[0130] Step 1): the second microcontroller 3.2 obtains the compensated and corrected first timer data;

[0131] Step 2): After the second timer starts to work, the second microcontroller 3.2 calculates the average value of the intake air concentration of the high-concentration poisonous gas sensor part 1.1 in each interval (5 seconds);

[0132] Step 3): The second microcontroller 3.2 subtracts the average value of the poisonous gas intake concentration data of the high-concentration poisonous gas sensor part 1.1 within the interval (5 seconds) from the poisonous gas intake concentration value set in the test;

[0133] Step 4): The second microcontroller 3.2 adjusts the real-time second timer data according to the sign and size of the subtraction calculation value. When the calculation value is positive, the second timer data time of this interval is increased. If the calculation value is larger, the increase is larger; when the calculation value is negative, the second timer data time of this interval is reduced. If the average value of the calculation value is larger, the reduction is larger;

[0134] Step 5): The above steps are repeated until the second timer stops timing, and the second microcontroller 3.2 accumulates the data time within the second timer interval.

[0135] Step 6): When the preset penetration concentration of the canister is reached, the second timer stops timing;

[0136] Step 7): The second microcontroller 3.2 performs addition calculation on the compensated and corrected first timer data and second timer data to obtain accurate protection time.

[0137] Step 4: When regulating the intake toxic gas flow rate, the first Bluetooth module 1.3 communicates wirelessly with the PC to achieve wireless control between the sealing device and the outside, and sends a flow setting value instruction to the first microcontroller 1.2 through the PC. According to the feedback signal of the digital pressure difference sensor 1.5, the opening of the solenoid valve 2.6 can be adjusted to achieve dynamic control of the intake toxic gas flow rate.

[0138] Among them, the first microcontroller is mainly used for receiving the toxic gas concentration detected by the high-concentration sensor, controlling the solenoid valve, and controlling the operation of the first Bluetooth module; the second microcontroller is mainly used for receiving the toxic gas concentration detected by the low-concentration sensor, toxic gas data processing operations, and controlling the operation of the second Bluetooth module; these different microcontrollers mainly process different types of targets and objects, and their respective divisions of labor are different, which can improve the control efficiency of this device and the processing efficiency of various data.

[0139] The above-mentioned compensation and correction are carried out for the timer in a targeted manner. When the actual gas filter canister protection time is detected, due to the instability of the external gas generating device, the actual gas concentration generated by the external gas generating device may deviate from the set value of the gas generating device. When the gas concentration generated by the external gas generating device passes through the ordinary gas filter canister protection time device, due to the instability of the external gas generating device, the gas concentration is higher or lower than the set value within the detection time period, which will cause an error in the time detected by the protection time detection device, which is inconsistent with the protection time under the conditions of the standard gas concentration setting value intake concentration, and will produce a large deviation. When the gas concentration generated by the external gas generating device enters the present device through the air inlet 2.4, the above-mentioned compensation and correction and protection time detection method of the present device can eliminate the error caused by the unstable gas generation concentration, and the accuracy is high.

[0140] The model of the first microcontroller 1.2 is LPC2138, the model of the second microcontroller 3.2 is LPC2138, the model of the digital differential pressure sensor 1.5 is SDP600, the model of the first Bluetooth module 1.3 is SKB501, the model of the second Bluetooth module 3.3 is SKB501, the solenoid valve 2.6 is a two-position two-way proportional valve 134230, and the models of the voltage conversion modules of the first power module 1.4 and the second power module 3.4 are LM2596 and XC6221332MR respectively.

[0141] This device has a simple structure, scientific design and easy operation. The sealing of the device is ensured by the gas filter canister sealing device and the Bluetooth module wireless communication. The high-concentration sensor and the low-concentration sensor can detect and record the concentrations of various toxic gases at the inlet and outlet ends of the gas filter canister. The inlet toxic gas flow rate can be dynamically adjusted through the air inlet solenoid valve. This device can accurately determine the protection time of the gas filter canister against various toxic gases, and can continuously test the protection time of the gas filter canister under different gas types, temperature and humidity, flow and concentration conditions. The test efficiency is high and it can be used for gas filter canister product testing and scientific research on the protection time of the gas filter canister.

Claims

1. A canister protection time detection device, characterized in that: It comprises a canister sealing device (2), the canister sealing device (2) is provided with an air inlet (2.4) and an air outlet (2.5), a high concentration sensor (1), a canister, and a low concentration sensor (3) are provided in the internal chamber of the canister sealing device (2) and between the air inlet (2.4) and the air outlet (2.5), and also comprises a first timer; it also comprises a second timer, the first timer is activated after the high concentration sensor (1) detects poisonous gas, and the second timer is activated after the low concentration sensor (3) detects poisonous gas; it also comprises a microcontroller, the data port of the microcontroller is connected to the high concentration sensor (1) and the low concentration sensor (3); When testing the canister protection time, use the following steps: Step 1: Connect the air inlet (2.4) on the canister sealing device (2) to the poison gas generating device; Step 2 allows the poison gas to enter the interior of the gas filter canister sealing device (2) through the air inlet (2.4), and allows the poison gas to pass through the high concentration sensor (1), the gas filter canister, and the low concentration sensor (3) in sequence, and then be discharged from the air outlet (2.5); In step 2, when the poison gas reaches the high concentration sensor (1), the first timer starts to work; and when the poison gas reaches the low concentration sensor (3), the second timer starts to work to obtain the penetration time of the gas filter canister.

2. The canister protection time detection device according to claim 1, characterized in that: The microcontroller comprises a first microcontroller (1.2) and a second microcontroller (3.2), wherein the data port of the first microcontroller (1.2) is connected to the high-concentration sensor (1), and the data port of the second microcontroller (3.2) is connected to the low-concentration sensor (3).

3. The canister protection time detection device according to claim 2, characterized in that: The data port of the first microcontroller (1.2) is connected to the first Bluetooth module (1.3), and the data port of the second microcontroller (3.2) is connected to the second Bluetooth module (3.3); the first Bluetooth module (1.3) and the second Bluetooth module (3.3) are interactively connected, and the first Bluetooth module (1.3) and the second Bluetooth module (3.3) can be wirelessly interactively connected to a PC.

4. The canister protection time detection device according to claim 3 is characterized in that: A valve is provided on the air inlet (2.4), the valve being a solenoid valve (2.6). A digital pressure difference sensor is also provided inside the high-concentration sensor sealing device part (2.1). A feedback signal of the digital pressure difference sensor is obtained through a first microcontroller (1.2) to calculate the air intake flow rate. The first microcontroller (1.2) issues a control instruction to regulate the air inlet valve according to the feedback pressure difference signal and flow setting instruction, thereby realizing air intake flow control.

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