Chemical alarm metrological verification device

Abstract

The utility model discloses a chemical alarm metrological verification device which comprises a box body and a vacuumizing mechanism, a partition plate is installed in the box body in a sliding and sealing mode, the partition plate divides an inner cavity of the box body into a detection cavity and a temporary gas storage cavity, and the detection cavity and the temporary gas storage cavity are mutually independent. A linear execution element is installed in the temporary air storage cavity, the output end of the linear execution element is connected with the partition plate, and the box body is provided with a quick-release manhole corresponding to the detection cavity, a verification air inlet pipe, a first air inlet pipe, a gas tester, a first ventilation pipe, a second air inlet pipe corresponding to the temporary air storage cavity and a second ventilation pipe corresponding to the temporary air storage cavity. And a third valve is mounted on the second air inlet pipe. The chemical alarms are arranged in the closed detection cavity, so that the batch detection of the chemical alarms can be realized, the pollution to the environment is avoided, and the influence on the safety of detection personnel is avoided; and the vacuumizing mechanism is arranged, so that the standard gas can be reused, the waste of the standard gas is reduced, and the pollution to the environment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical alarm calibration technology, and in particular to a chemical alarm calibration device. Background Technology

[0002] A chemical alarm is a device specifically designed to detect the concentration of specific chemicals or gases. When the detected concentration of a chemical exceeds a set safety level, the alarm will emit an audible and visual alarm signal to alert people to take appropriate measures to avoid potential dangers or poisoning accidents.

[0003] Chemical alarms play a crucial role; therefore, calibration is essential to ensure their accuracy. Currently, the calibration process for gas alarms typically involves purging the sensor directly with standard gas. This method has the following disadvantages: 1. It consumes a large amount of standard gas during purging; one bottle of standard gas can only calibrate one gas alarm, resulting in waste. 2. If calibrating gas alarms used for toxic detection, using harmful standard gas for purging leads to excess gas leaking into the air, causing environmental pollution and posing a safety risk to testing personnel. 3. Most detectors are mounted on pipes, making disassembly and use cumbersome and inconvenient. Utility Model Content

[0004] Therefore, it is necessary to provide a chemical alarm metering and calibration device to address the aforementioned technical problems.

[0005] To achieve the above objectives, this utility model provides a chemical alarm calibration device, including a housing. A partition is slidably and sealed within the housing, dividing the inner cavity of the housing into a detection chamber and a temporary gas storage chamber, which are independent of each other. A linear actuator is installed in the temporary gas storage chamber, and the output end of the linear actuator is connected to the partition. The linear actuator drives the partition to slide within the housing, thereby changing the volume of the detection chamber and the temporary gas storage chamber. The housing is equipped with a quick-release manhole corresponding to the detection chamber and a calibration inlet pipe. The system includes a first air inlet pipe, a gas tester, and a first air exchange pipe. A first valve is installed on the first air inlet pipe, and a second valve is installed on the first air inlet pipe. A second air inlet pipe and a second air exchange pipe, corresponding to the temporary gas storage chamber, are installed on the housing. A third valve is installed on the second air inlet pipe. The system also includes a vacuuming mechanism, which is connected to the first and second air exchange pipes. The vacuuming mechanism can transport the gas in the test chamber to the temporary gas storage chamber or discharge it to the outside, and can also transport the gas in the temporary gas storage chamber to the test chamber or discharge it to the outside.

[0006] Preferably, the vacuum pumping mechanism includes a vacuum pump, a first three-way valve, a second three-way valve, a third three-way valve, a four-way valve, a first suction pipe, a second suction pipe, a first exhaust pipe, a second exhaust pipe, and a third exhaust pipe. The three ports of the first three-way valve are respectively connected to the first air exchange pipe, the first suction pipe, and the second exhaust pipe. The three ports of the second three-way valve are respectively connected to the first suction pipe, the vacuum pump input end, and the second suction pipe. The four ports of the four-way valve are respectively connected to the vacuum pump output end, the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe. The three ports of the third three-way valve are respectively connected to the second air exchange pipe, the second suction pipe, and the first exhaust pipe. A third valve is installed on the first suction pipe, a fourth valve is installed on the second suction pipe, a fifth valve is installed on the first exhaust pipe, a sixth valve is installed on the second exhaust pipe, and a seventh valve is installed on the third exhaust pipe.

[0007] Preferably, it also includes a bracket, on which the vacuum pump and the housing are fixedly mounted.

[0008] Preferably, the housing is equipped with a first pressure sensor corresponding to the detection chamber and a second pressure sensor corresponding to the temporary air storage chamber.

[0009] Preferably, the quick-release manhole, calibration air inlet pipe, first air inlet pipe, gas tester, first ventilation pipe, and first air pressure sensor are all located on the side of the detection chamber away from the temporary air storage chamber.

[0010] Preferably, the front end face of the housing is provided with a transparent observation window.

[0011] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0012] 1. By placing the chemical alarm in a sealed detection chamber, batch testing of chemical alarms can be achieved, avoiding the leakage of standard gas into the air, preventing environmental pollution, and avoiding any impact on the safety of testing personnel;

[0013] 2. By introducing the standard gas from the detection chamber into the temporary gas storage chamber, removing the chemical alarm from the detection chamber, and then inserting the next batch of chemical alarms to be calibrated, the stored standard gas is introduced back into the detection chamber for reuse, thus reducing the waste of standard gas and reducing environmental pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 for Figure 1 Sectional view along line AA;

[0016] In the diagram: 1. Housing; 2. Partition; 3. Detection chamber; 4. Temporary air storage chamber; 5. Linear actuator; 6. Quick-release manhole; 7. Calibration inlet pipe; 8. First air inlet pipe; 9. Gas tester; 10. First ventilation pipe; 11. First valve; 12. Second valve; 13. Second air inlet pipe; 14. Second ventilation pipe; 15. Third valve; 16. Vacuum pump; 17. First tee; 18. Second tee; 19. Third tee; 20. Four-way valve; 21. First extraction pipe; 22. Second extraction pipe; 23. First exhaust pipe; 24. Second exhaust pipe; 25. Third exhaust pipe; 26. Fourth valve; 27. Fifth valve; 28. Sixth valve; 29. ​​Seventh valve; 30. Bracket; 31. First pressure sensor; 32. Second pressure sensor; 33. Transparent observation window; 34. Eighth valve. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] Please see Figure 1 and Figure 2 This application provides a chemical alarm calibration device, including a housing 1. A partition 2 is slidably and sealed inside the housing 1, dividing the inner cavity of the housing 1 into a detection chamber 3 and a temporary gas storage chamber 4. The detection chamber 3 and the temporary gas storage chamber 4 are independent of each other. A linear actuator 5 is installed in the temporary gas storage chamber 4. The output end of the linear actuator 5 is connected to the partition 2. The linear actuator 5 drives the partition 2 to slide within the housing 1, thereby changing the volume of the detection chamber 3 and the temporary gas storage chamber 4. The linear actuator 5 is selected as an electric cylinder or a servo cylinder, which can drive the partition 2 to move with precise displacement, thereby adjusting the volume of the detection chamber 3 and the temporary gas storage chamber 4. When the number of chemical alarms to be detected is small, the volume of the detection chamber 3 can be made smaller, thus reducing the consumption when filling the detection chamber 3 with standard gas. When the number of chemical alarms to be detected is large, the volume of the detection chamber 3 can be increased, thus facilitating the detection chamber 3 to accommodate more chemical alarms and facilitating batch testing of chemical alarms.

[0019] The housing 1 is equipped with a quick-release manhole 6, a calibration air inlet pipe 7, a first air inlet pipe 8, a gas tester 9, and a first ventilation pipe 10, all corresponding to the detection chamber 3. A first valve 11 is installed on the calibration air inlet pipe 7, and a second valve 12 is installed on the first air inlet pipe 8. The housing 1 is also equipped with a second air inlet pipe 13 and a second ventilation pipe 14, corresponding to the temporary gas storage chamber 4. An eighth valve 34 is installed on the second air inlet pipe 13. The housing 1 also includes a vacuuming mechanism, which is connected to the first ventilation pipe 10 and the second ventilation pipe 14. The vacuuming mechanism can transport the gas in the detection chamber 3 to the temporary gas storage chamber 4 or discharge it to the outside, and can also transport the gas in the temporary gas storage chamber 4 to the detection chamber 3 or discharge it to the outside. When the quick-release manhole 6 is open, it allows easy access to the detection chamber 3 to retrieve and place the chemical alarm. When the quick-release manhole 6 is closed, it keeps the detection chamber 3 sealed. The calibration inlet pipe 7 is used to connect to the zero-point gas cylinder or standard gas cylinder. After the first valve 11 is opened, it is easy to introduce zero-point gas or standard gas into the detection chamber 3. The gas detector 9 can detect the gas concentration in the detection chamber 3, facilitating the calibration of the chemical alarm. The first air inlet pipe 8 connects the detection chamber 3 to the atmosphere. Opening the second valve 12 allows the detection chamber 3 to connect to the atmosphere, eliminating the negative pressure in the detection chamber 3 and facilitating the opening of the quick-release manhole 6. The second air inlet pipe 13 connects the temporary gas storage chamber 4 to the atmosphere. Opening the eighth valve 34 allows the temporary gas storage chamber 4 to connect to the atmosphere, eliminating the negative pressure in the temporary gas storage chamber 4. The first valve 11, the second valve 12, and the third valve 15 are selected as solenoid valves or electric valves.

[0020] The vacuum pumping mechanism includes a vacuum pump 16, a first three-way valve 17, a second three-way valve 18, a third three-way valve 19, a four-way valve 20, a first suction pipe 21, a second suction pipe 22, a first exhaust pipe 23, a second exhaust pipe 24, and a third exhaust pipe 25. The three ports of the first three-way valve 17 are respectively connected to the first ventilation pipe 10, the first suction pipe 21, and the second exhaust pipe 24. The three ports of the second three-way valve 18 are respectively connected to the first suction pipe 21, the input terminal of the vacuum pump 16, and the second suction pipe 22. The four ports of the four-way valve 20 are... The ports are respectively connected to the output end of vacuum pump 16, first exhaust pipe 23, second exhaust pipe 24, and third exhaust pipe 25. The three ports of the third tee 19 are respectively connected to the second air exchange pipe 14, second suction pipe 22, and first exhaust pipe 23. A third valve 15 is installed on the first suction pipe 21, a fourth valve 26 is installed on the second suction pipe 22, a fifth valve 27 is installed on the first exhaust pipe 23, a sixth valve 28 is installed on the second exhaust pipe 24, and a seventh valve 29 is installed on the third exhaust pipe 25. The fourth valve 26, fifth valve 27, sixth valve 28, and seventh valve 29 are selected as solenoid valves or electric valves.

[0021] A bracket 30 is provided to facilitate the support of the vacuum pump 16 and the housing 1, and the vacuum pump 16 and the housing 1 are fixedly installed on the bracket 30.

[0022] To facilitate the detection of air pressure in the detection chamber 3 and the temporary air storage chamber 4, a first air pressure sensor 31 corresponding to the detection chamber 3 and a second air pressure sensor 32 corresponding to the temporary air storage chamber 4 are installed on the housing 1. The first air pressure sensor 31 detects the air pressure in the detection chamber 3, and the second air pressure sensor 32 detects the air pressure in the temporary air storage chamber 4.

[0023] To avoid affecting the movement of the partition 2 and to prevent the detection chamber 3 from being unable to reach a smaller volume, the quick-release manhole 6, calibration air inlet pipe 7, first air inlet pipe 8, gas tester 9, first ventilation pipe 10, and first air pressure sensor 31 are all located on the side of the detection chamber 3 away from the temporary air storage chamber 4. In this way, the partition 2 can move a larger range.

[0024] To facilitate observation of the display interface of the chemical alarm inside the detection chamber 3, a transparent observation window 33 is provided on the front face of the housing 1. The internal conditions of the detection chamber 3 and the temporary gas storage chamber 4 can be observed through the transparent observation window 33.

[0025] The working steps of this embodiment are as follows:

[0026] S1. Based on the number of chemical alarms to be tested, determine the volume of the detection chamber 3. Drive the partition 2 to slide inside the housing 1 through the linear actuator 5 to change the volume of the detection chamber 3 and the temporary gas storage chamber 4, so that the volume of the detection chamber 3 is adapted to the number of chemical alarms.

[0027] S2, open the quick-release manhole 6, place the chemical alarm into the detection chamber 3, and close the quick-release manhole 6;

[0028] S3, turn on vacuum pump 16, third valve 15, and seventh valve 29. Vacuum pump 16 evacuates detection chamber 3 through first suction pipe 21, first three-way valve 17, and first air exchange pipe 10, and discharges the air in detection chamber 3 through four-way valve 20 and third exhaust pipe 25. After evacuation is completed, vacuum pump 16, third valve 15, and seventh valve 29 are closed.

[0029] S4, the first valve 11 is opened, and standard gas is introduced into the detection chamber 3. The gas concentration in the detection chamber 3 is detected by the gas tester 9 to facilitate the calibration of the chemical alarm. After the gas concentration reaches the target, the first valve 11 closes. The chemical alarm is then calibrated and corrected by remote control.

[0030] S5. Since the standard gas may be toxic or harmful, it should not be directly emptied after the calibration. Instead, the standard gas in the detection chamber 3 can be introduced into the temporary gas storage chamber 4 for reuse. Specifically, the vacuum pump 16, the fourth valve 26, and the seventh valve 29 are turned on. The vacuum pump 16 evacuates the temporary gas storage chamber 4 through the second three-way valve 18, the second suction pipe 22, the third three-way valve 19, and the second air exchange pipe 14, and the air in the temporary gas storage chamber 4 is discharged through the four-way valve 20 and the third exhaust pipe 25. After the vacuuming is completed, the vacuum pump 16, the fourth valve 26, and the seventh valve 29 are closed. Subsequently, the third valve 15, the vacuum pump 16, and the fifth valve 27 are turned on. The vacuum pump 16 draws the standard gas into the detection chamber 3 through the second three-way valve 18, the first suction pipe 21, the first three-way valve 17, and the first air exchange pipe 10, and introduces the standard gas in the detection chamber 3 into the temporary gas storage chamber 4 through the four-way valve 20, the first exhaust pipe 23, the third three-way valve 19, and the second air exchange pipe 14.

[0031] S6, open the second valve 12 to allow outside air to enter the detection chamber 3 through the first air inlet pipe 8, so that the negative pressure in the detection chamber 3 disappears;

[0032] S7, repeat S1 to S3;

[0033] S8, open the fourth valve 26, vacuum pump 16, and fifth valve 27. Vacuum pump 16 draws standard gas into the temporary gas storage chamber 4 through the second air exchange pipe 14, the third three-way valve 19, the second exhaust pipe 22, and the second three-way valve 18. The standard gas is then sequentially introduced into the four-way valve 20, the second exhaust pipe 24, the first three-way valve 17, the first air exchange pipe 10, and the detection chamber 3 to achieve the reuse of the standard gas. The gas concentration in the detection chamber 3 is detected by the gas tester 9. If the gas concentration is insufficient, the first valve 11 is opened to introduce standard gas into the detection chamber 3. The gas concentration in the detection chamber 3 is then detected by the gas tester 9. Once the gas concentration is reached, the first valve 11 is closed, and the chemical alarm is calibrated and corrected via remote control.

[0034] Finally, when the used standard gas needs to be vented, the third exhaust pipe 25 is connected to the gas treatment device. The third exhaust pipe 25 discharges the standard gas into the gas treatment device, which then processes the standard gas to prevent air pollution.

[0035] It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A device for the metrological verification of a chemical alarm, comprising a box (1), characterized in that, The box (1) is slidably and sealingly provided with a partition plate (2), the partition plate (2) divides the inner cavity of the box (1) into a detection cavity (3) and a temporary gas storage cavity (4), the detection cavity (3) and the temporary gas storage cavity (4) are independent of each other; a linear actuator (5) is installed in the temporary gas storage cavity (4), the output end of the linear actuator (5) is connected with the partition plate (2), the partition plate (2) is driven to slide in the box (1) by the linear actuator (5) to change the volume of the detection cavity (3) and the temporary gas storage cavity (4); the box (1) is provided with a quick-release manhole (6) corresponding to the detection cavity (3), a calibration air inlet pipe (7), a first air inlet pipe (8), a gas tester (9), and a first air exchange pipe (10); the first valve (11) is installed on the calibration air inlet pipe (7); the second valve (12) is installed on the first air inlet pipe (8); the box (1) is provided with a second air inlet pipe (13) corresponding to the temporary gas storage cavity (4) and a second air exchange pipe (14); the eighth valve (34) is installed on the second air inlet pipe (13); further comprising a vacuum pumping mechanism, the vacuum pumping mechanism is communicated with the first air exchange pipe (10) and the second air exchange pipe (14), the vacuum pumping mechanism can transport the gas in the detection cavity (3) to the temporary gas storage cavity (4) or discharge to the outside, and transport the gas in the temporary gas storage cavity (4) to the detection cavity (3) or discharge to the outside.

2. The chemical alarm meterprover apparatus of claim 1, wherein, The vacuum pumping mechanism comprises a vacuum pump (16), a first three-way pipe (17), a second three-way pipe (18), a third three-way pipe (19), a four-way pipe (20), a first air exhaust pipe (21), a second air exhaust pipe (22), a first exhaust pipe (23), a second exhaust pipe (24), and a third exhaust pipe (25); the three ports of the first three-way pipe (17) are communicated with the first air exchange pipe (10), the first air exhaust pipe (21), and the second exhaust pipe (24) respectively; the three ports of the second three-way pipe (18) are communicated with the first air exhaust pipe (21), the input end of the vacuum pump (16), and the second air exhaust pipe (22) respectively; the four ports of the four-way pipe (20) are communicated with the output end of the vacuum pump (16), the first exhaust pipe (23), the second exhaust pipe (24), and the third exhaust pipe (25) respectively; the three ports of the third three-way pipe (19) are communicated with the second air exchange pipe (14), the second air exhaust pipe (22), and the first exhaust pipe (23) respectively; the third valve (15) is installed on the first air exhaust pipe (21); the fourth valve (26) is installed on the second air exhaust pipe (22); the fifth valve (27) is installed on the first exhaust pipe (23); the sixth valve (28) is installed on the second exhaust pipe (24); and the seventh valve (29) is installed on the third exhaust pipe (25).

3. The chemical alarm meterprover apparatus of claim 2, wherein, Further comprising a bracket (30), the vacuum pump (16) and the box (1) are fixedly installed on the bracket (30).

4. The chemical alarm meterprover apparatus of claim 3 wherein, The box (1) is provided with a first air pressure sensor (31) corresponding to the detection cavity (3) and a second air pressure sensor (32) corresponding to the temporary gas storage cavity (4).

5. The chemical alarm meterprover apparatus of claim 4 wherein, The quick-release manhole (6), the detection inlet pipe (7), the first air inlet pipe (8), the gas tester (9), the first air exchange pipe (10) and the first air pressure sensor (31) are located on the side of the detection cavity (3) away from the temporary gas storage cavity (4).

6. A chemical alarm metering device according to any one of claims 1 to 5, characterized in that The front end face of the box body (1) is provided with a transparent observation window (33).

Images