Extraction type gas detection device

Abstract

The utility model discloses an extraction type gas detection device. The extraction type gas detection device comprises a detection box, a gas detector, a gas extraction pump, a filtering device, a compressed air supply device, a calibration device and a control device, according to the utility model, the motor rotates to drive the turntable to rotate, the turntable shifts the indexing plate through the shifting rod and the indexing groove, and the indexing plate rotates each time to enable the first air inlet hole in the lower wall of the rotating cylinder to be communicated with the eight groups of exhaust pipes in sequence, so that the aim of switching the eight groups of exhaust pipes for air intake is fulfilled; the gas detector is used for detecting the concentration of gas entering the detection box, the motor continuously rotates to keep the device continuously running for 24 hours, and the on-site gas concentration is monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to an extraction type gas detection device. Background Art

[0002] The existing toxic or flammable gas detection system is mainly implemented through gas alarms. When flammable or toxic gas leaks in an industrial environment and the gas alarm detects that the gas concentration reaches the critical point set by the explosion or poisoning alarm, the alarm will send an alarm signal to remind people to take safety measures and drive the exhaust, cut-off, and spray systems to prevent explosions, fires, and poisoning accidents, thereby ensuring safe production. However, the existing detection system generally uses single-point gas alarms for the detection of toxic or flammable gases in industrial environments. The alarms are distributed in the factory area, and each gas alarm can only measure the gas within a certain range around it, that is, the coverage area of ​​a single alarm is small, and a large number of alarms are required to achieve full coverage of the entire industrial area. For this reason, there is a public technology on the market that proposes a vacuum-type toxic or flammable gas detection system, in which a plurality of air inlets are opened on the pipeline, and a reed-type flow limiting valve is provided at each of the air inlets. The reed-type flow limiting valve includes a valve body and two relatively arranged valve plates located in the valve body, and the valve plate includes an integrally connected fixed portion, a bending portion and a blocking portion. The fixed portion is fixed to the valve body by bolts, and the blocking portions of the two valve plates are in an "eight" shape and can approach each other when the airflow increases; the pipeline is connected to a vacuum suction pump. The beneficial effect of this technology is that the gas in the environment is collected by a vacuum suction pump for unified analysis, which reduces the number of toxic or flammable gas detectors. In addition, a reed-type flow limiting valve is installed at each gas inlet to stabilize the airflow;

[0003] However, the defects of the above-mentioned improved technology are also obvious. It aggregates the gases extracted from all detection points and analyzes them uniformly. If the gas at one of the multiple detection points exceeds the standard, this technology cannot directly reflect the location of the excess, and it is still necessary to test it separately again. There is also a technology that uses a double-head diaphragm pump in conjunction with multiple control valves to control the exhaust pipe passages of multiple detection points in turn. There is always one group of exhaust pipes of multiple detection points connected to the detection device and the other pipes are directly emptied. Then, the control valve is used to switch each pipeline to achieve the purpose of detecting all detection points in turn. However, this type of structure has too many valves and the control circuit is complicated. Therefore, it is necessary to optimize and improve the structure of the extraction gas detection device. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an extraction type gas detection device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an extractable gas detection device, including a detection box, a gas detector, an air pump, a filtering device, a compressed air supply device, a calibration device and a control device, wherein eight groups of air extraction pipes are arranged through the lower wall of the detection box, a purge pipe and a calibration pipe are arranged through the side wall of the detection box from top to bottom in sequence, an exhaust pipe is arranged through the top of the detection box, and the end of the exhaust pipe away from the detection box is connected to the air pump, the lower wall inside the detection box is fixedly connected to a bottom box through a fixing frame, and the upper wall of the bottom box is fixed A detection box with a diameter larger than that of a base box is connected, the gas detector is fixedly connected to the inner rear wall of the detection box and close to the upper wall, eight groups of through holes are provided on the lower wall of the detection box and located at the outer periphery of the base box, the eight groups of through holes are equally distributed in a circle with the axis of the detection box as the center, the lower inner wall of the detection box is rotatably connected to a rotating cylinder, the inner wall of the detection box is provided with a driving structure for driving the rotating cylinder to rotate, a turntable is provided at the output end of the driving structure, and a dividing structure is provided between the turntable and the rotating cylinder for dividing when the driving structure drives the rotating cylinder to rotate.

[0006] As a further description of the above technical solution:

[0007] The lower wall of the rotating cylinder is provided with a first air inlet hole, and the diameter of a circle formed by the first air inlet hole rotating along the center of the rotating cylinder is the same as the diameter of a circle formed by the centers of the eight groups of through holes on the lower wall of the detection box.

[0008] As a further description of the above technical solution:

[0009] The ends of the purge tube and the calibration tube extending into the interior of the detection box are both connected to the bottom box, and the outer walls of the ends of the purge tube and the calibration tube located inside the detection box are both provided with electric control valves.

[0010] As a further description of the above technical solution:

[0011] The inner walls of the eight groups of through holes on the lower wall of the detection box are fixedly connected with the first one-way valves. The upper ends of the eight groups of exhaust pipes pass through the lower wall of the detection box and extend into the interior of the detection box. The ends of the eight groups of exhaust pipes extending into the interior of the detection box are respectively fixedly connected to the eight groups of first one-way valves. The flow direction of the first one-way valve is to only allow gas to enter the detection box from the exhaust pipe.

[0012] As a further description of the above technical solution:

[0013] A second air inlet hole that runs through from top to bottom is provided at the center of the lower wall of the rotating cylinder and the center of the lower wall of the detection box. A second one-way valve that runs through the second air inlet hole is fixedly connected to the lower wall of the detection box and located inside the bottom box. The flow direction of the second one-way valve is to only allow gas to enter the detection box from the bottom box.

[0014] As a further description of the above technical solution:

[0015] The driving structure includes a first bracket and a motor. The first bracket is fixedly connected to the inner wall of the detection box and is located below the gas detector. The motor is fixedly connected to the lower wall of the first bracket through a connecting seat. The turntable is fixedly connected to the end of the motor's extended shaft.

[0016] As a further description of the above technical solution:

[0017] The dividing structure includes a second bracket, a rotating shaft, a dividing plate and a lever, the lever is fixedly connected to the lower wall of the rotating plate and is located near the outer wall of the rotating plate, the second bracket is fixedly connected to the inner wall of the rotating cylinder and is located near the mouth of the rotating cylinder, the rotating shaft is fixedly connected to the upper wall of the second bracket and the axis of the rotating shaft is colinear with the axis of the rotating cylinder, the dividing plate is fixedly connected to the outer wall of the rotating shaft, and eight groups of dividing grooves are arranged on the outer wall of the dividing plate, and the eight groups of dividing grooves are equally distributed on the circumference with the axis of the rotating shaft as the center, and the outer wall of the lever is slidably connected to the inner wall of any one of the eight groups of dividing grooves.

[0018] The utility model has the following beneficial effects:

[0019] 1. Compared with the prior art, in the extractable gas detection device, the motor rotates at a low speed to drive the turntable to rotate. The turntable moves the indexing plate through the lever and the indexing groove. The indexing plate rotates one eighth of a circle for each rotation of the motor. Each rotation of the indexing plate can make the first air inlet hole on the lower wall of the rotating cylinder connected with the eight groups of exhaust pipes in sequence, thereby achieving the purpose of switching the air intake of the eight groups of exhaust pipes. The gas concentration entering the detection box is detected by the gas detector. The continuous rotation of the motor can keep the device running uninterruptedly for 24 hours, and monitor the gas concentration on site in real time.

[0020] 2. Compared with the prior art, the extractable gas detection device can be opened and closed regularly by coordinating the electric control valve on the purge pipe with the motor rotation speed. After the gas detection in one set of exhaust pipes is completed, the electric control valve of the purge pipe can be opened to introduce high-pressure air into the bottom box and the detection box for purging and replacement. The purging can be completed before switching to the next set of exhaust pipes for detection, so as to avoid mixing of the two sets of gases and causing inaccurate detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the extractable gas detection device proposed by the utility model;

[0022] Figure 2 A schematic diagram of the internal structure of the detection box of the extractable gas detection device proposed in the utility model;

[0023] Figure 3A partial cross-sectional view of the internal structure of the detection box of the extractable gas detection device proposed by the utility model;

[0024] Figure 4 This is a schematic diagram of the upward view of the connection structure between the detection box and the bottom box of the extractable gas detection device proposed by the utility model;

[0025] Figure 5 This is a schematic top view of the internal structure of the rotating cylinder of the extractable gas detection device proposed by the utility model.

[0026] Legend:

[0027] 1. Detection box; 2. Suction pipe; 3. Purge pipe; 4. Calibration pipe; 5. Exhaust pipe; 6. Electric control valve; 7. Fixed bracket; 8. Bottom box; 9. Detection box; 10. First one-way valve; 11. Rotating cylinder; 12. Second air inlet; 13. Second one-way valve; 14. First bracket; 15. Motor; 16. Turntable; 17. Lever; 18. Second bracket; 19. Rotating shaft; 20. Dividing plate; 21. Dividing groove; 22. First air inlet; 23. Gas detector. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Reference Figures 1 to 5 The utility model provides an extractable gas detection device: including a detection box 1, a gas detector 23, an air pump, a filtering device, a compressed air supply device, a calibration device and a control device. Eight groups of air extraction pipes 2 are arranged through the lower wall of the detection box 1. The side walls of the detection box 1 are sequentially penetrated from top to bottom with purge pipes 3 and calibration pipes 4. An exhaust pipe 5 is arranged through the top of the detection box 1. The end of the exhaust pipe 5 away from the detection box 1 is connected to the air pump. The lower wall of the inner side of the detection box 1 is fixedly connected with a bottom box 8 through a fixing frame 7. The purge pipe 3 and the calibration pipe 4 are sequentially penetrated from top to bottom. The top of the detection box 1 is penetrated with an exhaust pipe 5. The end of the exhaust pipe 5 away from the detection box 1 is connected to the air pump. The lower wall of the inner side of the detection box 1 is fixedly connected with a bottom box 8 through a fixing frame 7. The ends of the pipe 3 and the calibration pipe 4 extending into the interior of the detection box 1 are both connected to the bottom box 8. The outer walls of the ends of the purge pipe 3 and the calibration pipe 4 located inside the detection box 1 are both provided with an electric control valve 6. The ends of the purge pipe 3 and the calibration pipe 4 away from the detection box 1 are respectively connected to the compressed air supply device and the calibration device. The eight groups of exhaust pipes 2 switch the detection gap, and the compressed air supply device provides high-pressure air through the purge pipe 3 to enter the bottom box 8 and the detection box 9 for purging and replacement. The calibration device can calibrate and test the gas detector 23 according to the set frequency;

[0030] A detection box 9 having a diameter larger than that of the bottom box 8 is fixedly connected to the upper wall of the bottom box 8, a gas detector 23 is fixedly connected to the inner rear wall of the detection box 9 and close to the upper wall, eight groups of through holes are arranged on the lower wall of the detection box 9 and located at the outer periphery of the bottom box 8, the eight groups of through holes are equally distributed in a circle with the axis of the detection box 9 as the center, the inner walls of the eight groups of through holes on the lower wall of the detection box 9 are fixedly connected to the first one-way valve 10, the upper ends of the eight groups of exhaust pipes 2 penetrate the lower wall of the detection box 1 and extend into the interior of the detection box 1, the ends of the eight groups of exhaust pipes 2 extending into the interior of the detection box 1 are respectively fixedly connected to the eight groups of first one-way valves 10, the flow direction of the first one-way valve 10 is to only allow gas to enter the detection box 9 from the exhaust pipe 2, the eight groups of exhaust pipes 2 correspond to eight detection points respectively, during operation, the detection box 9 is connected to one of the eight groups of exhaust pipes 2, the gas at the corresponding detection point is extracted to the detection box 9 by the exhaust pump, and the gas concentration is detected by the gas detector 23;

[0031] The lower wall of the inner side of the detection box 9 is rotatably connected with a rotating cylinder 11, and the lower wall and the center position of the rotating cylinder 11 and the lower wall and the center position of the detection box 9 are both provided with a second air inlet hole 12 which is through from top to bottom. The lower wall of the detection box 9 and the inside of the bottom box 8 are fixedly connected with a second one-way valve 13 which is through the second air inlet hole 12, and the flow direction of the second one-way valve 13 is to only allow gas to enter the detection box 9 from the bottom box 8, and the second one-way valve 13 can control the gas from entering the bottom box 8 from the detection box 9, thereby improving the safety of the device, and a common rotating sealing structure on the market is provided between the rotating cylinder 11 and the detection box 9 to ensure that the eight groups of air extraction pipes 2 will not cross each other when they are individually inhaled;

[0032] The inner wall of the detection box 9 is provided with a driving structure for driving the rotating cylinder 11 to rotate, and the driving structure includes a first bracket 14 and a motor 15. The first bracket 14 is fixedly connected to the inner wall of the detection box 9 and is located below the gas detector 23. The motor 15 is fixedly connected to the lower wall of the first bracket 14 through a connecting seat, and the turntable 16 is fixedly connected to the end of the motor 15 extending out of the shaft. The motor 15 is preferably a common servo motor 15 on the market. The speed of the motor 15 can be accurately adjusted by the control device to meet the detection time requirements of the gas detector 23;

[0033] A turntable 16 is provided at the output end of the driving structure, and a dividing structure for dividing the rotating cylinder 11 when the driving structure drives the rotating cylinder 11 to rotate is provided between the turntable 16 and the rotating cylinder 11. A first air inlet hole 22 is provided on the lower wall of the rotating cylinder 11. The circle formed by the first air inlet hole 22 rotating along the center of the rotating cylinder 11 has the same diameter as the circle formed by the centers of the eight groups of through holes on the lower wall of the detection box 9. The dividing structure includes a second bracket 18, a rotating shaft 19, a dividing plate 20 and a lever 17. The lever 17 is fixedly connected to the lower wall of the turntable 16 and is located near the outer wall of the circumference of the turntable 16. The second bracket 18 is fixedly connected to the inner wall of the rotating cylinder 11 and is located near the mouth of the rotating cylinder 11. The rotating shaft 19 is fixedly connected to the upper wall of the second bracket 18, and the axis of the rotating shaft 19 is colinear with the axis of the rotating cylinder 11. The dividing plate 20 is fixedly connected to the outer wall of the rotating shaft 19. The outer wall of the dividing plate 20 is provided with eight groups of dividing grooves 21. The eight groups of dividing grooves 21 are equally distributed on the circumference with the axis of the rotating shaft 19 as the center. The outer wall of the lever 17 is slidably connected to the inner wall of any group of the eight groups of dividing grooves 21. Through the dividing structure, the motor 15 rotates one circle, and the rotating cylinder 11 rotates one eighth of a circle, that is, the first air inlet 22 is switched from the state of being connected to one of the eight groups of through holes to the state of being connected to the next group of through holes. Continuous rotation can realize that the eight groups of exhaust pipes 2 enter the detection state in sequence.

[0034] Working principle: Eight groups of air extraction pipes 2 correspond to eight detection points respectively. During operation, the detection box 9 is connected to one of the eight groups of air extraction pipes 2. The gas at the corresponding detection point is extracted to the detection box 9 by the air extraction pump. The gas concentration is detected by the gas detector 23. The motor 15 is preferably a servo motor 15 commonly used on the market. The speed of the motor 15 can be accurately adjusted by the control device to meet the detection time requirements of the gas detector 23. Through the indexing structure, the motor 15 rotates one circle, and the rotating cylinder 11 rotates one eighth of a circle, that is, the first air inlet 22 is switched from the connection state with one of the eight groups of through holes to the state of connection with the next group of through holes. Continuous rotation can achieve Now the eight groups of exhaust pipes 2 enter the detection state in turn, and the second one-way valve 13 can control the gas from entering the bottom box 8 from the detection box 9, thereby improving the safety of the device. A common rotating sealing structure on the market is arranged between the rotating cylinder 11 and the detection box 9 to ensure that the eight groups of exhaust pipes 2 will not cross-exhaust each other when they are individually air-intaken. The purge pipe 3 and the calibration pipe 4 are connected to the compressed air providing device and the calibration device at one end away from the detection box 1 respectively. The eight groups of exhaust pipes 2 switch the detection gap, and the high-pressure air provided by the compressed air providing device enters the bottom box 8 and the detection box 9 through the purge pipe 3 for purging and replacement. The calibration device can calibrate and test the gas detector 23 according to the set frequency.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An extractable gas detection device, comprising a detection box (1), a gas detector (23), an air pump, a filtering device, a compressed air supply device, a calibration device and a control device, characterized in that: Eight groups of exhaust pipes (2) are provided through the lower wall of the detection box (1); a purge pipe (3) and a calibration pipe (4) are provided through the side wall of the detection box (1) from top to bottom in sequence; an exhaust pipe (5) is provided through the top of the detection box (1); the end of the exhaust pipe (5) away from the detection box (1) is connected to an exhaust pump; a bottom box (8) is fixedly connected to the lower wall of the inner side of the detection box (1) via a fixing frame (7); a detection box (9) having a diameter larger than that of the bottom box (8) is fixedly connected to the upper wall of the bottom box (8); and the gas detector (23) is fixedly connected to the inner side of the detection box (9). Eight groups of through holes are arranged on the rear wall and close to the upper wall, and on the lower wall of the detection box (9) and at the outer position of the bottom box (8), and the eight groups of through holes are equally distributed in a circle with the axis of the detection box (9) as the center. The lower wall inside the detection box (9) is rotatably connected to a rotating cylinder (11), and the inner wall of the detection box (9) is provided with a driving structure for driving the rotating cylinder (11) to rotate, and a rotating disk (16) is arranged at the output end of the driving structure, and a graduation structure is arranged between the rotating disk (16) and the rotating cylinder (11) for performing graduation when the driving structure drives the rotating cylinder (11) to rotate.

2. The extractable gas detection device according to claim 1, characterized in that: The lower wall of the rotating cylinder (11) is provided with a first air inlet hole (22), and the circle formed by the first air inlet hole (22) rotating along the center of the rotating cylinder (11) has the same diameter as the circle formed by the centers of the eight groups of through holes on the lower wall of the detection box (9).

3. The extractable gas detection device according to claim 1, characterized in that: The ends of the purge tube (3) and the calibration tube (4) extending into the interior of the detection box (1) are both connected to the bottom box (8), and the outer walls of the ends of the purge tube (3) and the calibration tube (4) located inside the detection box (1) are both provided with electric control valves (6).

4. The extractable gas detection device according to claim 1, characterized in that: The inner side walls of the eight groups of through holes on the lower wall of the detection box (9) are all fixedly connected to the first one-way valve (10); the upper ends of the eight groups of air extraction pipes (2) penetrate the lower wall of the detection box (1) and extend into the interior of the detection box (1); the ends of the eight groups of air extraction pipes (2) extending into the interior of the detection box (1) are respectively fixedly connected to the eight groups of first one-way valves (10); the flow direction of the first one-way valve (10) is such that gas is only allowed to enter the detection box (9) from the air extraction pipe (2).

5. The extractable gas detection device according to claim 1, characterized in that: A second air inlet hole (12) which is through-through is provided at the center of the lower wall of the rotating cylinder (11) and the center of the lower wall of the detection box (9). A second one-way valve (13) which is through-through is fixedly connected to the lower wall of the detection box (9) and located inside the bottom box (8). The flow direction of the second one-way valve (13) is such that gas is only allowed to enter the detection box (9) from the bottom box (8).

6. The extractable gas detection device according to claim 1, characterized in that: The driving structure comprises a first bracket (14) and a motor (15); the first bracket (14) is fixedly connected to the inner wall of the detection box (9) and is located below the gas detector (23); the motor (15) is fixedly connected to the lower wall of the first bracket (14) via a connecting seat; and the turntable (16) is fixedly connected to the end of a shaft extending from the motor (15).

7. The extractable gas detection device according to claim 1, characterized in that: The indexing structure comprises a second bracket (18), a rotating shaft (19), a dividing plate (20) and a lever (17); the lever (17) is fixedly connected to the lower wall of the rotating plate (16) and is located near the outer wall of the circumference of the rotating plate (16); the second bracket (18) is fixedly connected to the inner wall of the rotating cylinder (11) and is located near the mouth of the rotating cylinder (11); the rotating shaft (19) is fixedly connected to the upper wall of the second bracket (18) and the axis of the rotating shaft (19) is colinear with the axis of the rotating cylinder (11); the dividing plate (20) is fixedly connected to the outer wall of the rotating shaft (19); eight groups of dividing grooves (21) are arranged on the outer wall of the dividing plate (20); the eight groups of dividing grooves (21) are equally distributed on the circumference with the axis of the rotating shaft (19) as the center; the outer wall of the lever (17) is slidably connected to the inner wall of any one of the eight groups of dividing grooves (21).

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