Detection device for trace arsenic hydride gas

Abstract

The utility model relates to the technical field of trace gas detection devices, and particularly discloses a trace arsenic hydride gas detection device which comprises a shell, a control box, a first detection module and a second detection module are arranged in the shell, and the first detection module and the second detection module are respectively connected with the control box. The first detection module and the second detection module are respectively provided with an exhaust assembly, and a gas inlet pipe, a first chamber and a second chamber are arranged in the shell. According to the utility model, the difference value between the currently measured arsenic hydride gas concentration value and the last measured arsenic hydride gas concentration value can be directly compared with a difference threshold value; according to the arsenic hydride gas concentration detection method, the arsenic hydride gas concentration change in a short time can be found in time, and the problem that the response speed becomes slow due to the fact that the detected numerical value is firstly stored and then compared with the numerical value measured last time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of trace gas detection devices, and particularly designs a detection device for trace arsine gas. Background Technique

[0002] Due to the high toxicity of arsine gas, trace arsine gas detection devices must be used in factories to monitor and control the concentration of arsine gas to ensure the safety and health of workers. These detection devices can accurately measure the concentration of arsine gas. When the concentration exceeds the safety standard, the device will issue an alarm so that corresponding measures can be taken, such as ventilation, evacuation of personnel, etc., to avoid major accidents caused by arsine poisoning.

[0003] For arsine gas detection devices, traditional detection methods have certain limitations. Because they use silver diethyldithiocarbamate solution as the absorption liquid, the volatility of chloroform in this solution will affect the measurement accuracy. Although existing sensor-based detection devices can provide real-time monitoring and record the values of each detection, and rely on thresholds to judge whether the arsine gas concentration exceeds the standard and whether to issue an alarm, this method, although direct, has a certain delay. Because at the moment of arsine leakage, the concentration difference between two detections will change rapidly. Even if the threshold is not reached, the rapid upward trend of the concentration itself is a potential danger signal that should be recognized and warned in time. If only relying on the concentration threshold as the judgment standard, the initial stage of leakage will be missed, which is not conducive to the timely discovery of danger and increases the risks borne by enterprises. Therefore, a more sensitive arsine detection device is needed. Based on this, the inventor purposefully provides a detection device for trace arsine gas that can identify and give an early warning at the initial stage of leakage. Content of the Utility Model

[0004] The purpose of the utility model is to provide a detection device for trace arsine gas that can identify and give an early warning at the initial stage of leakage in view of the deficiencies of the prior art, so as to solve the problem that when leakage occurs, the difference between two detections may be large, but since the set threshold is not reached, the device will not immediately issue an alarm, resulting in untimely response to danger.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A detection device for trace arsine gas, which includes a housing. A control box, a first detection module and a second detection module are arranged in the housing. The first detection module and the second detection module are respectively connected to the control box. Exhaust components are arranged on both the first detection module and the second detection module. An air inlet pipe, a first chamber and a second chamber are arranged in the housing;

[0007] The air inlet end of the first detection module is connected to the air outlet end of the intake pipe, and a first one-way valve is provided at the connection between the two. The air inlet end of the first chamber is communicated with the intake pipe through a first delivery pipe, and a third one-way valve is provided at the connection between the first chamber and the first delivery pipe. The third one-way valve opens and closes synchronously with the first one-way valve. The second detection module is communicated with the second chamber through a second delivery pipe, and a second one-way valve is provided at the connection between the second chamber and the second delivery pipe. The second one-way valve opens and closes synchronously with the first one-way valve. The first chamber is communicated with the second chamber, and an air pump is provided at the connection between the two. The air pump opens and closes alternately with the first one-way valve. The first one-way valve, the second one-way valve, the third one-way valve and the air pump are all connected to the control box.

[0008] As a further optimization or improvement of this solution.

[0009] A vacuum pump is provided at the connection between the second detection module and the second delivery pipe. The vacuum pump opens and closes synchronously with the first one-way valve, and the vacuum pump is connected to the control box.

[0010] As a further optimization or improvement of this solution.

[0011] Each of the two exhaust assemblies includes an exhaust valve and an exhaust pipe. The air outlet ends of the first detection module and the second detection module are respectively connected to the two exhaust pipes. The two exhaust valves are respectively provided on the exhaust pipes, and the two exhaust valves open and close synchronously. The two exhaust valves are both connected to the control box.

[0012] As a further optimization or improvement of this solution.

[0013] A buzzer with an indicator light is provided on the housing, and the buzzer with the indicator light is connected to the control box.

[0014] As a further optimization or improvement of this solution.

[0015] Mounting brackets are fixedly installed at the four corners of the housing, and the mounting brackets are arranged obliquely.

[0016] As a further optimization or improvement of this solution.

[0017] A display screen is provided on the housing, and the display screen is connected to the control box.

[0018] The beneficial effects of the present utility model:

[0019] 1. The utility model can directly compare the difference between the currently measured arsine gas concentration value and the previously measured arsine gas concentration value with the difference threshold, then make a judgment on whether to give an early warning, and then store the value, improving the response speed. It can timely detect the change of arsine gas concentration within a short time, avoiding the problem that the response speed becomes slow due to storing the detected value first and then comparing it with the previously measured value, so as to take preventive or countermeasures in advance and avoid potential hazards.

[0020] 2. The utility model takes the difference threshold and the concentration threshold together as the judgment criteria, which can achieve multi-level judgment criteria, and corresponding measures can be taken according to different safety levels and risk degrees, making the monitoring more flexible and multi-level.

[0021] 3. In the stage of introducing an air sample during one round of detection, the utility model temporarily stores a part of the air sample of this round in the first chamber. Then, during detection, the air sample in the first chamber is pumped into the second chamber by an air pump and temporarily stored in the second chamber, so as to ensure that the air sample in the second chamber is the same as the air sample detected in the first detection module in the previous round. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following further describes the present utility model with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0024] Figure 2 It is a schematic diagram of the internal structure of the housing.

[0025] The labels in the figure are as follows:

[0026] 1. Housing; 2. Inlet pipe; 3. First delivery pipe; 4. First chamber; 5. Second delivery pipe; 6. First one-way valve; 7. Second one-way valve; 8. Vacuum pump; 9. Control box; 10. First detection module; 11. Second detection module; 12. Exhaust valve; 13. Exhaust pipe; 14. Mounting rack; 15. Buzzer with indicator light; 16. Display screen; 17. Third one-way valve; 18. Air pump; 19. Second chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] SeeFigure 1 - Figure 2 , a detection device for trace arsine gas, which comprises a housing 1. A control box 9, a first detection module 10 and a second detection module 11 are arranged in the housing 1. The first detection module 10 and the second detection module 11 are respectively connected to the control box 9. Exhaust components are arranged on both the first detection module 10 and the second detection module 11. An air inlet pipe 2, a first chamber 4 and a second chamber 19 are arranged in the housing 1;

[0029] The air inlet end of the first detection module 10 is connected to the air outlet end of the air inlet pipe 2, and a first one-way valve 6 is arranged at the connection part between the two. The air inlet end of the first chamber 4 is communicated with the air inlet pipe 2 through a first conveying pipe 3, and a third one-way valve 17 is arranged at the connection part between the first chamber 4 and the first conveying pipe 3. The third one-way valve 17 and the first one-way valve 6 are opened and closed synchronously. The second detection module 11 is communicated with the second chamber 19 through a second conveying pipe 5, and a second one-way valve 7 is arranged at the connection part between the second chamber 19 and the second conveying pipe 5. The second one-way valve 7 and the first one-way valve 6 are opened and closed synchronously. The first chamber 4 is communicated with the second chamber 19, and an air pump 18 is arranged at the connection part between the two. The air pump 18 and the first one-way valve 6 are opened and closed alternately. The first one-way valve 6, the second one-way valve 7, the third one-way valve 17 and the air pump 18 are all connected to the control box 9.

[0030] In a specific embodiment, both the first detection module 10 and the second detection module 11 include an arsine gas electrochemical sensor and a signal processing circuit. The control box 9 includes a PLC control system, a signal receiving and transmitting circuit, an RTC module, a data comparator, a data storage and recording module, a networking module, etc. The above components are all prior arts, and the specific models are not disclosed in the present utility model, which does not affect the integrity of the present utility model.

[0031] The working principle of the present utility model is as follows: When it is first used, the first one-way valve 6, the third one-way valve 17, and the second one-way valve 7 are all in the closed state, the air pump 18 is in the open state, and the first chamber 4 and the second chamber 19 are in a vacuum state. Then when starting to work, the control box 9 controls the first one-way valve 6 to open, and at the same time the third one-way valve 17 and the second one-way valve 7 open, while the air pump 18 closes. At this time, external air enters the intake pipe 2. Part of the air enters the first detection module 10. Since the first chamber 4 is in a negative pressure state, another part of the air will enter the first chamber 4 for temporary storage. At the same time, since there is no air in the second chamber 19, no air enters the second detection module 11 either. After a period of time, the control box 9 controls the first one-way valve 6 to close. At this time, the third one-way valve 17 and the second chamber 19 close simultaneously, while the air pump 18 opens. At this time, the first detection module 10 and the second detection module 11 start to detect the concentration of arsine gas in the internal air respectively. This is the first round of detection. The data measured by the first detection module 10 is compared with the concentration threshold. If it is greater than the concentration threshold, the control box 9 will issue an alarm. If it is less than the concentration threshold, it is safe. At the same time, the difference between the value of the first detection module 10 and the second detection module 11 is compared with the difference threshold. If the difference is too large, the control box 9 will issue a warning to remind the worker to conduct key observations. If the difference is small, no reminder will be given. Then the value measured by the first detection module 10 and the difference between the values of the first detection module 10 and the second detection module 11 are recorded. At the same time, since the air pump 18 is open, the air pump 18 will pump the air sample in the first chamber 4 into the second chamber 19 and temporarily store it in the second chamber 19. At this time, the air sample in the second chamber 19 is the same as the air sample in the first detection module 10 during the first round of detection.

[0032] After the first round of detection results of the first detection module 10 and the second detection module 11 are completed, the control box 9 starts to repeat the above steps for the second round of detection. During the second round of detection, the gas detected in the second detection module 11 is the air sample in the second chamber 19, that is, the air sample in the first round of detection. Then the difference between the arsine gas concentration value obtained from the second round of detection by the first detection module 10 and the arsine gas concentration value detected by the second detection module 11 is calculated and then compared with the preset difference threshold. Even if the arsine gas concentration value obtained from the second round of detection by the first detection module 10 does not exceed the threshold, but if the difference exceeds the difference threshold, the control box 9 will also issue a warning to remind the worker to observe the recorded detection data and judge the possibility of leakage. After the second round of detection is completed, the above steps can be continuously repeated for continuous monitoring.

[0033] Moreover, this structure directly compares the currently measured arsine gas concentration value with the previously measured arsine gas concentration value and the difference threshold, then makes a judgment on whether to give an alarm, and stores the value, improving the response speed, being able to detect the change in arsine gas concentration within a short time in a timely manner, avoiding the problem in the prior art that after storing the detected value and then comparing it with the previously measured value, the response speed becomes slow, and cooperating with the concentration threshold as the judgment criterion, multi-level judgment criteria can be achieved.

[0034] Specifically, a vacuum pump 8 is provided at the connection between the second detection module 11 and the second delivery pipe 5. The vacuum pump 8 opens and closes synchronously with the first one-way valve 6, and the vacuum pump 8 is connected to the control box 9.

[0035] In a specific embodiment, when the first one-way valve 6 is opened, the vacuum pump 8 is also turned on, so as to quickly pump the air sample in the second chamber 19 through the second delivery pipe 5 into the second detection module 11, and a vacuum is formed in the second chamber 19, making the efficiency of the air pump 18 pumping the air in the first chamber 4 into the second chamber 19 higher.

[0036] More specifically, both of the exhaust components include an exhaust valve 12 and an exhaust pipe 13. The air outlet ends of the first detection module 10 and the second detection module 11 are respectively connected to the two exhaust pipes 13. The two exhaust valves 12 are respectively arranged on the exhaust pipes 13, and the two exhaust valves 12 open and close synchronously. The two exhaust valves 12 are both connected to the control box 9.

[0037] In a specific embodiment, after the first detection module 10 and the second detection module 11 complete a round of detection, the control box 9 controls the exhaust valve 12 to open, and discharges the air in the first detection module 10 and the second detection module 11 through the two exhaust pipes 13 respectively.

[0038] Meanwhile, it should be noted that a buzzer 15 with an indicator light is provided on the housing 1, and the buzzer 15 with an indicator light is connected to the control box 9.

[0039] In a specific embodiment, when the control box 9 determines that the arsine gas concentration detected by the first detection module 10 exceeds the threshold, while automatically alarming, it will also activate the buzzer 15 with an indicator light to give a warning to the workers on the site with a sound and an indicator light, reminding the workers to evacuate urgently, thereby protecting personal safety.

[0040] More specifically, mounting brackets 14 are fixedly installed at the four corners of the housing 1.

[0041] In a specific embodiment, a screw is used to pass through the reserved hole on the mounting bracket 14, and the mounting bracket 14 is threadedly connected to the mounting hole, so that the housing 1 can be fixed at the mounting position, facilitating the user to fix the housing 1.

[0042] Meanwhile, it should be noted that a display screen 16 is provided on the housing 1, and the display screen 16 is connected to the control box 9.

[0043] In a specific embodiment, the current concentration of arsine gas measured by the first detection module 10 and the difference ratio compared with the previously measured concentration are displayed in real time through the display screen 16, facilitating the user to quickly and accurately identify the current gas concentration level and the trend of gas concentration change.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A detection device for trace arsine gas, characterized in that: It comprises a housing (1), wherein a control box (9), a first detection module (10) and a second detection module (11) are arranged in the housing (1), the first detection module (10) and the second detection module (11) are respectively connected to the control box (9), the first detection module (10) and the second detection module (11) are both provided with an exhaust assembly, and an air intake pipe (2), a first chamber (4) and a second chamber (19) are arranged in the housing (1); The air inlet end of the first detection module (10) is connected to the air outlet end of the air inlet pipe (2), and a first one-way valve (6) is provided at the connection between the two. The air inlet end of the first chamber (4) is connected to the air inlet pipe (2) through the first delivery pipe (3), and a third one-way valve (17) is provided at the connection between the first chamber (4) and the first delivery pipe (3). The third one-way valve (17) opens and closes synchronously with the first one-way valve (6). The second detection module (11) is connected to the second chamber (19) through the second delivery pipe (5). ), and a second one-way valve (7) is provided at the connection between the second chamber (19) and the second delivery pipe (5), and the second one-way valve (7) and the first one-way valve (6) are opened and closed synchronously, the first chamber (4) and the second chamber (19) are connected, and an air pump (18) is provided at the connection between the two, and the air pump (18) and the first one-way valve (6) are opened and closed alternately, and the first one-way valve (6), the second one-way valve (7), the third one-way valve (17) and the air pump (18) are all connected to the control box (9).

2. The device for detecting trace amounts of arsenic hydrogen gas according to claim 1, characterized in that: A vacuum pump (8) is provided at the connection between the second detection module (11) and the second delivery pipe (5); the vacuum pump (8) and the first one-way valve (6) are opened and closed synchronously; and the vacuum pump (8) is connected to a control box (9).

3. The device for detecting trace amounts of arsine gas according to claim 2, characterized in that: The two exhaust assemblies each comprise an exhaust valve (12) and an exhaust pipe (13); the exhaust ends of the first detection module (10) and the second detection module (11) are respectively connected to the two exhaust pipes (13); the two exhaust valves (12) are respectively arranged on the exhaust pipes (13); the two exhaust valves (12) are opened and closed synchronously; and the two exhaust valves (12) are both connected to a control box (9).

4. The device for detecting trace amounts of arsine gas according to claim 1, characterized in that: A buzzer (15) with an indicator light is provided on the housing (1), and the buzzer (15) with an indicator light is connected to the control box (9).

5. The device for detecting trace amounts of arsine gas according to claim 1, characterized in that: Mounting frames (14) are fixedly mounted at the four corners of the housing (1), and the mounting frames (14) are arranged at an angle.

6. The device for detecting trace amounts of arsine gas according to claim 1, characterized in that: The housing (1) is provided with a display screen (16), and the display screen (16) is connected to the control box (9).

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