Multi-flow-path chlorine gas purity automatic switching online detection device

Abstract

The utility model relates to the field of detection devices, in particular to a multi-flow-path chlorine gas purity automatic switching online detection device which comprises a pretreatment box, the device further comprises a first filter, a sampling assembly, a reducer pipe, a second filter, a gas temporary storage assembly, a collecting assembly, a gas chromatograph and an accident chlorine negative pressure system. The air inlet end of the pretreatment box is connected with a first filter through a pipeline. According to the device, the second filter is arranged, the gas outlet end of the pretreatment box is connected to the second filter through the reducer pipe, gas is injected into the temporary storage cylinder for temporary storage through the gas injection pipe and the gas inlet hole after being filtered, then the two second valve bodies on the temporary storage cylinder are opened, the two ends of the temporary storage cylinder are blocked, and the gas is temporarily stored in the temporary storage cylinder; and then the electric cylinder is started to push the temporary storage barrel upwards, gas injection can be carried out on the next temporary storage barrel, and the gas injected temporary storage barrel is placed at a gas chromatograph to be analyzed, so that the gas can be conveniently and rapidly detected.

Description

Technical Field

[0001] The utility model belongs to the field of detection devices, and in particular relates to a multi-flow path chlorine purity automatic switching online detection device. Background Art

[0002] A hydrogen chloride treatment unit is a device used to treat hydrogen chloride gas. It is usually used in the chemical, metallurgical and environmental protection fields. Its main function is to effectively remove or convert hydrogen chloride gas to reduce the impact on the environment and protect human health.

[0003] At present, the hydrogen content, oxygen content and purity of chlorine are all manually sampled and analyzed by laboratory technicians. After the laboratory technicians absorb the gas on site with a gas volume tube, they take it to the laboratory for further analysis. Manual sampling and analysis cannot effectively monitor the hydrogen content, oxygen content and purity of chlorine in the chlorine. When the hydrogen content in the chlorine gas enters the explosion limit range (when the hydrogen content in the chlorine gas is within the explosion limit, it may explode at any time under light or heat), the safety is insufficient. Online detection devices in the existing technology are usually difficult to effectively monitor the hydrogen content of chlorine and cannot ensure the safe operation of the production system.

[0004] Therefore, a multi-channel chlorine purity automatic switching online detection device is proposed, which can effectively monitor the hydrogen content of chlorine and ensure the safe operation of the production system. Utility Model Content

[0005] In order to overcome the problem that the online detection device in the prior art is usually difficult to effectively monitor the hydrogen content index of chlorine and cannot ensure the safe operation of the production system, a multi-flow path chlorine purity automatic switching online detection device is proposed.

[0006] The technical scheme of the utility model is: a multi-channel chlorine purity automatic switching online detection device, comprising a pretreatment box; also comprising a first filter, a sampling component, a reducer, a second filter, a gas temporary storage component, a collecting component, a gas chromatograph and an accident chlorine negative pressure system; the air inlet end of the pretreatment box is connected with the first filter through a pipeline, the sampling component is arranged outside the first filter, the air outlet end of the pretreatment box is installed with a reducer, the air outlet end of the reducer is installed with the second filter, the air outlet end of the second filter is installed with the gas temporary storage component, the air outlet end of the gas temporary storage component is installed with the collecting component, the air outlet end of the gas temporary storage component is arranged with a gas chromatograph, the upper end of the gas chromatograph is arranged with the accident chlorine negative pressure system, the air outlet end of the accident chlorine negative pressure system is installed with a second collecting bottle through a pipeline, and the side wall of the reducer is installed on the air inlet end of the accident chlorine negative pressure system through a pipeline.

[0007] The gas temporary storage component includes a fixed frame, a U-shaped block, an electric cylinder, an air inlet, an air outlet pipe, an air injection pipe, a motor, a threaded rod and an air injection cannula; the air outlet port of the second filter is fixedly connected to the air injection pipe, the inner wall of the air injection pipe is fixedly connected to the motor, the output shaft of the motor is fixedly connected to the threaded rod, the outer wall of the threaded rod is threadedly installed with the air injection cannula, the air outlet end of the air injection pipe is fixedly connected to the fixed frame, the middle part of the inner wall of the fixed frame is fixedly connected to the U-shaped block, the opening of the U-shaped block is upward, the lower end of the U-shaped block is fixedly connected to the electric cylinder, the output shaft of the electric cylinder passes through the lower end of the U-shaped block and extends to the inside of the U-shaped block, and the end of the fixed frame close to the second filter is penetrated by an air inlet. An air outlet pipe is fixedly connected to one end of the fixed frame away from the second filter, and a plurality of temporary storage parts are stacked on the inner wall of the U-shaped block. The temporary storage parts include a temporary storage cylinder, a second valve body and a supporting plate. Two second valve bodies are installed on the temporary storage cylinder. A supporting plate is fixedly connected to the middle part of the upper end of the temporary storage cylinder, and the upper end of the supporting plate is higher than the upper end of the second valve body. The two second valve bodies are symmetrical with respect to the supporting plate. The two ends of the temporary storage cylinder are respectively fitted with the two ends of the inner wall of the fixed frame, and the inner wall of the temporary storage cylinder is flush with the inner wall of the air inlet hole. The end of the air injection tube close to the U-shaped block is slidably arranged on the air inlet hole and the inner wall of the temporary storage cylinder, and the two ends of the air injection tube are respectively communicated with the inside of the air injection pipe and the temporary storage cylinder.

[0008] The sampling component includes a three-way pipe, a three-way valve, a ventilation pipe, a first valve body, a fixed pipe, a first accident chlorine negative pressure device and a sampling pipe; a three-way pipe is arranged on the outside of the first filter, a three-way valve is arranged on the three-way pipe, a ventilation pipe is fixedly connected to one output end of the three-way pipe, a first valve body is installed on the ventilation pipe, a sampling pipe is fixedly connected to the input end of the three-way pipe, the other output end of the three-way pipe is connected to the air inlet end of the first filter through a pipeline, one end of the fixed pipe is fixedly connected to the first accident chlorine negative pressure device, and a sampling pipe is fixedly connected to the air inlet port of the three-way pipe.

[0009] A flow meter and a fourth valve body are installed on the reducer.

[0010] The second filter includes a Y-shaped tube, a mounting body and a filter plate; the Y-shaped tube is installed at the air outlet end of the reducer, the mounting body is installed at the lower end of the Y-shaped tube by bolts, the filter plate is fixedly connected to the upper end of the mounting body, the filter plate is located in the inner center of the Y-shaped tube, and the filter plate separates the air inlet end and the air outlet end of the Y-shaped tube into two parts.

[0011] A valve body is installed on the air inlet pipe of the accident chlorine negative pressure system.

[0012] The collecting assembly comprises a mounting tube, a hollow box, a mounting cylinder, a first collecting bottle and a third valve body; a hollow box is threadedly mounted on the inner wall of the air outlet tube, a mounting tube is fixedly connected to the other end of the hollow box, a plurality of mounting cylinders are threadedly mounted to the other end of the mounting tube, a first collecting bottle is fixedly connected to the air outlet end of the mounting cylinder, and a third valve body is arranged on the mounting cylinder.

[0013] The gas chromatograph is provided with a first analysis mechanism and a second analysis mechanism.

[0014] The beneficial effects of the utility model are as follows: by turning on the motor to rotate the threaded rod, the gas injection cannula will move along the outer wall of the threaded rod and enter the inner wall of the temporary storage tube through the air inlet hole, and the gas injection cannula is used to realize the sealed connection between the gas injection pipe and the temporary storage tube, and then a sampling assembly is installed on each chlorine gas sampling port, and then connected to the gas inlet end of the pretreatment box through a pipeline, and the gas outlet end of the pretreatment box is connected to the second filter through a reducer, and after the gas is filtered, it is injected into the temporary storage tube through the gas injection pipe and the gas inlet hole for temporary storage, and then the two second valve bodies on the temporary storage tube are opened to seal the two ends of the temporary storage tube, so that the gas is temporarily stored in the temporary storage tube, and then the electric cylinder is turned on to push the temporary storage tube upward, so that the next temporary storage tube can be injected with gas, and the temporary storage tube that has been injected with gas can be placed on the gas chromatograph for analysis, and part of the gas in the reducer enters the accident chlorine negative pressure system through the pipeline, and is temporarily stored in the second collection bottle after being processed, which solves the problem that it is usually difficult for online detection devices to effectively monitor the hydrogen content index of chlorine and ensure the safe operation of the production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of a sampling assembly in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0017] Figure 3 It is a three-dimensional structural schematic diagram of a gas chromatograph in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0018] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the second filter in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0019] Figure 5 It is a schematic diagram of the three-dimensional split structure of the gas temporary storage component in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0020] Figure 6 It is a cross-sectional three-dimensional structural schematic diagram of a fixed frame in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0021] Figure 7 It is a three-dimensional structural schematic diagram of a collecting component in a multi-flow path chlorine purity automatic switching online detection device of the utility model;

[0022] Figure 8It is a three-dimensional structural schematic diagram of a part of A in a multi-flow path chlorine purity automatic switching online detection device of the utility model.

[0023] The symbols in the attached drawings are: 1, pretreatment box; 2, first filter; 3, sampling assembly; 301, three-way pipe; 302, three-way valve; 303, ventilation pipe; 304, first valve body; 305, fixed pipe; 306, first accident chlorine negative pressure device; 307, sampling pipe; 4, reducer; 5, second filter; 501, Y-shaped pipe; 502, mounting body; 503, filter plate; 6, gas temporary storage assembly; 601, fixed frame; 602, U-shaped block; 603, electric cylinder; 604, air inlet; 605 , outlet pipe; 606, temporary storage cylinder; 607, second valve body; 608, bearing plate; 609, gas injection pipe; 610, motor; 611, threaded rod; 612, gas injection cannula; 7, collecting assembly; 701, mounting tube; 702, hollow box; 703, mounting cylinder; 704, first collecting bottle; 705, third valve body; 8, gas chromatograph; 801, first analysis mechanism; 802, second analysis mechanism; 9, accident chlorine negative pressure system; 10, second collecting bottle; 11, flow meter; 12, fourth valve body. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 8 The utility model provides an embodiment: a multi-channel chlorine purity automatic switching online detection device, comprising a pretreatment box 1; further comprising a first filter 2, a sampling component 3, a reducer 4, a second filter 5, a gas temporary storage component 6, a collecting component 7, a gas chromatograph 8 and an accident chlorine negative pressure system 9; the air inlet end of the pretreatment box 1 is connected with the first filter 2 through a pipeline, the sampling component 3 for sampling is arranged outside the first filter 2, the air outlet end of the pretreatment box 1 is installed with a reducer 4, the air outlet end of the reducer 4 is installed with a second filter 5, the air outlet end of the second filter 5 is installed with a gas temporary storage component 6, the air outlet end of the gas temporary storage component 6 is installed with a collecting component 7, the air outlet end of the gas temporary storage component 6 is arranged with a gas chromatograph 8, the upper end of the gas chromatograph 8 is provided with an accident chlorine negative pressure system 9, the air outlet end of the accident chlorine negative pressure system 9 is installed with a second collecting bottle 10 through a pipeline, and the side wall of the reducer 4 is installed at the air inlet end of the accident chlorine negative pressure system 9 through a pipeline.

[0026] The gas temporary storage component 6 includes a fixed frame 601, a U-shaped block 602, an electric cylinder 603, an air inlet 604, an air outlet pipe 605, an air injection pipe 609, a motor 610, a threaded rod 611 and an air injection cannula 612; the air outlet port of the second filter 5 is fixedly connected to the air injection pipe 609, the inner wall of the air injection pipe 609 is fixedly connected to the motor 610, the output shaft of the motor 610 is fixedly connected to the threaded rod 611, and the outer wall of the threaded rod 611 is fixedly connected to the output shaft of the motor 610. The fixing frame 601 is fixedly connected to the air outlet end of the air injection pipe 609, and a U-shaped block 602 is fixedly connected to the middle of the inner wall of the fixing frame 601. The opening of the U-shaped block 602 faces upward, and the lower end of the U-shaped block 602 is fixedly connected to an electric cylinder 603. The output shaft of the electric cylinder 603 passes through the lower end of the U-shaped block 602 and extends to the inside of the U-shaped block 602. An air inlet hole 604 is penetrated and opened at one end of the fixing frame 601 close to the second filter 5, and an air outlet pipe 605 is fixedly connected to one end of the fixing frame 601 away from the second filter 5. A plurality of temporary storage parts are stacked on the inner wall of the U-shaped block 602, and the temporary storage parts include a temporary storage cylinder 606, a second valve body 607 and a bearing plate 608. Two second valve bodies 607 are installed on the temporary storage cylinder 606. The middle part of the upper end of the temporary storage cylinder 606 is fixedly connected to the bearing plate 608, and the upper end of the bearing plate 608 is higher than the upper end of the second valve body 607. The two second valve bodies 607 are symmetrical with respect to the bearing plate 608, the two ends of the temporary storage tube 606 are respectively fitted with the two ends of the inner wall of the fixed frame 601, the inner wall of the temporary storage tube 606 is flush with the inner wall of the air inlet hole 604, and the end of the gas injection tube 612 close to the U-shaped block 602 is slidably set on the inner wall of the air inlet hole 604 and the temporary storage tube 606, and the two ends of the gas injection tube 612 are respectively communicated with the gas injection pipe 609 and the interior of the temporary storage tube 606.

[0027] When in use, the motor 610 is turned on to rotate the threaded rod 611, and the gas injection cannula 612 will move along the outer wall of the threaded rod 611, and will enter the inner wall of the temporary storage tube 606 through the air inlet hole 604. The gas injection cannula 612 is used to achieve the sealed connection between the gas injection pipe 609 and the temporary storage tube 606, and then the sampling assembly 3 is installed at each chlorine gas sampling port, and then connected to the gas inlet end of the pretreatment box 1 through a pipeline, and the gas outlet end of the pretreatment box 1 is connected to the second filter 5 through the reducer 4. After the gas is filtered, it passes through the gas injection pipe 609 and The gas is injected into the temporary storage tube 606 through the air inlet 604 for temporary storage, and then the two second valve bodies 607 on the temporary storage tube 606 are opened to seal the two ends of the temporary storage tube 606, so that the gas is temporarily stored inside the temporary storage tube 606, and then the electric cylinder 603 is opened to push the temporary storage tube 606 upward, so that the next temporary storage tube 606 can be injected with gas, and the temporary storage tube 606 that has been injected with gas can be placed at the gas chromatograph 8 for analysis, and part of the gas in the reducer 4 enters the accident chlorine negative pressure system 9 through the pipeline and is temporarily stored in the second collection bottle 10 after being processed.

[0028] See also Figure 2In this embodiment, the sampling assembly 3 includes a three-way pipe 301, a three-way valve 302, a ventilation pipe 303, a first valve body 304, a fixed pipe 305, a first accident chlorine negative pressure device 306 and a sampling pipe 307; the outside of the first filter 2 is provided with a three-way pipe 301, the three-way pipe 301 is provided with a three-way valve 302, one output end of the three-way pipe 301 is fixedly connected with a ventilation pipe 303, the ventilation pipe 303 is installed with a first valve body 304, the three A sampling pipe 307 is fixedly connected to the input end of the through pipe 301, and the other output end of the three-way pipe 301 is connected to the air inlet end of the first filter 2 through a pipeline. One end of the fixed pipe 305 is fixedly connected to the first accident chlorine negative pressure device 306, and a sampling pipe 307 is fixedly connected to the air inlet port of the three-way pipe 301. The sampling pipe 307 is installed at the chlorine sampling port, and then the three-way valve 302 is opened according to the detection needs to allow the gas to enter the first filter 2 through the pipeline.

[0029] See also Figure 1 In this embodiment, a flow meter 11 and a fourth valve body 12 are installed on the reducer 4. The flow meter 11 can be turned on to detect the flow rate of the gas flowing through the reducer 4.

[0030] See also Figure 1 and Figure 4 In this embodiment, the second filter 5 includes a Y-shaped tube 501, a mounting body 502 and a filter plate 503; the outlet end of the reducer 4 is installed with the Y-shaped tube 501, the lower end of the Y-shaped tube 501 is installed with the mounting body 502 by bolts, and the upper end of the mounting body 502 is fixedly connected with the filter plate 503, the filter plate 503 is located in the inner center of the Y-shaped tube 501, and the filter plate 503 separates the air inlet end and the air outlet end of the Y-shaped tube 501 into two parts. The filter plate 503 is placed inside the Y-shaped tube 501, so that the filter plate 503 separates the air inlet end and the air outlet end of the Y-shaped tube 501 into two parts, which can achieve gas filtering and facilitate the replacement of the filter plate 503.

[0031] See also Figure 1 In this embodiment, a valve body is installed on the air inlet pipe of the accident chlorine negative pressure system 9, and the gas can be easily transported by setting the valve body.

[0032] See also Figure 1 and Figure 7In this embodiment, the collecting assembly 7 includes a mounting tube 701, a hollow box 702, a mounting cylinder 703, a first collecting bottle 704 and a third valve body 705; the inner wall of the gas outlet pipe 605 is threadedly mounted with a hollow box 702, the other end of the hollow box 702 is fixedly connected with the mounting tube 701, and the other end of the mounting tube 701 is threadedly mounted with multiple mounting cylinders 703, the gas outlet end of the mounting cylinder 703 is fixedly connected with the first collecting bottle 704, and the mounting cylinder 703 is provided with a third valve body 705, and the gas can also flow into the mounting cylinder 703 through the gas outlet pipe 605 and the hollow box 702, and opening the third valve body 705 can allow the gas to enter the interior of the first collecting bottle 704 for temporary storage.

[0033] See also Figure 1 and Figure 3 In this embodiment, a first analysis mechanism 801 and a second analysis mechanism 802 are provided on the gas chromatograph 8. The gas chromatograph 8 includes two analysis channels. The first channel uses nitrogen as a carrier gas to analyze hydrogen. The second channel is a light component channel that can be used to analyze oxygen, nitrogen, methane, carbon monoxide, and carbon dioxide in chlorine.

[0034] Working principle: When working, first, turn on the motor 610 to rotate the threaded rod 611, and the gas injection cannula 612 will move along the outer wall of the threaded rod 611, and will enter the inner wall of the temporary storage tube 606 through the air inlet 604. The gas injection cannula 612 is used to achieve the sealed connection between the gas injection pipe 609 and the temporary storage tube 606, and then install the sampling assembly 3 at each chlorine sampling port, install the sampling connecting pipe 307 at the chlorine sampling port, and then open the three-way valve 302 according to the detection needs to allow the gas to enter the first filter 2 through the pipeline, and turn on the flow meter 11 to detect the flow rate of the gas flowing through the reducer 4.

[0035] The air outlet end of the first filter 2 is connected to the air inlet end of the pretreatment box 1 through a pipeline, and the air outlet end of the pretreatment box 1 is connected to the second filter 5 through a reducer 4.

[0036] The filter plate 503 is placed inside the Y-shaped tube 501 so that the filter plate 503 separates the air inlet and air outlet of the Y-shaped tube 501 into two parts, thereby filtering the gas and facilitating replacement of the filter plate 503 .

[0037] After the gas is filtered, it is injected into the temporary storage tube 606 through the gas injection pipe 609 and the air inlet 604 for temporary storage, and then the two second valve bodies 607 on the temporary storage tube 606 are opened to seal the two ends of the temporary storage tube 606, so that the gas is temporarily stored inside the temporary storage tube 606, and then the electric cylinder 603 is opened to push the temporary storage tube 606 upward, and the next temporary storage tube 606 can be injected with gas, and the temporary storage tube 606 that has been injected with gas can be placed at the gas chromatograph 8 for analysis. Part of the gas in the reducer 4 enters the accident chlorine negative pressure system 9 through the pipeline and is temporarily stored in the second collection bottle 10 after being processed.

[0038] The gas can also flow into the installation tube 703 through the gas outlet pipe 605 and the hollow box 702, and opening the third valve body 705 can allow the gas to enter the first collection bottle 704 for temporary storage.

[0039] The gas chromatograph 8 includes two analysis channels. The first channel uses nitrogen as a carrier gas to analyze hydrogen. The second channel is a light component channel that can be used to analyze oxygen, nitrogen, methane, carbon monoxide, and carbon dioxide in chlorine. Some of the gas can enter the accident chlorine negative pressure system 9 through a pipeline and be input from its output end into the second collection bottle 10 for temporary storage.

Claims

1. A multi-channel chlorine purity automatic switching online detection device, comprising a pretreatment box (1); characterized in that: It also comprises a first filter (2), a sampling assembly (3), a reducer (4), a second filter (5), a gas temporary storage assembly (6), a collecting assembly (7), a gas chromatograph (8) and an accident chlorine negative pressure system (9); the air inlet end of the pretreatment box (1) is connected to the first filter (2) via a pipeline, the sampling assembly (3) is arranged outside the first filter (2), the air outlet end of the pretreatment box (1) is installed with a reducer (4), the air outlet end of the reducer (4) is installed with a second filter (5), the air outlet end of the second filter (5) is installed with a gas temporary storage assembly (6), the air outlet end of the gas temporary storage assembly (6) is installed with a collecting assembly (7), the air outlet end of the gas temporary storage assembly (6) is installed with a gas chromatograph (8), the upper end of the gas chromatograph (8) is provided with an accident chlorine negative pressure system (9), the air outlet end of the accident chlorine negative pressure system (9) is installed with a second collecting bottle (10) via a pipeline, and the side wall of the reducer (4) is installed at the air inlet end of the accident chlorine negative pressure system (9) via a pipeline; The gas temporary storage component (6) comprises a fixed frame (601), a U-shaped block (602), an electric cylinder (603), an air inlet (604), an air outlet pipe (605), an air injection pipe (609), a motor (610), a threaded rod (611) and an air injection cannula (612); the air outlet port of the second filter (5) is fixedly connected to the air injection pipe (609), the inner wall of the air injection pipe (609) is fixedly connected to the motor (610), the output shaft of the motor (610) is fixedly connected to the threaded rod (611), and the threaded rod (611) is fixedly connected to the output shaft of the motor (610). ) is threadedly mounted with an air injection cannula (612); the air outlet end of the air injection tube (609) is fixedly connected to a fixed frame (601); a U-shaped block (602) is fixedly connected to the middle of the inner wall of the fixed frame (601); the opening of the U-shaped block (602) faces upward; an electric cylinder (603) is fixedly connected to the lower end of the U-shaped block (602); an output shaft of the electric cylinder (603) passes through the lower end of the U-shaped block (602) and extends to the interior of the U-shaped block (602); and an end of the fixed frame (601) close to the second filter (5) is penetrated by an opening The U-shaped block (602) has an air inlet hole (604), an end of the fixed frame (601) away from the second filter (5) is fixedly connected to an air outlet pipe (605), and a plurality of temporary storage components are stacked and placed on the inner wall of the U-shaped block (602), wherein the temporary storage components include a temporary storage cylinder (606), a second valve body (607) and a bearing plate (608), two second valve bodies (607) are installed on the temporary storage cylinder (606), and the bearing plate (608) is fixedly connected to the middle part of the upper end of the temporary storage cylinder (606), and the upper end of the bearing plate (608) is higher than the second valve body (607). At the upper end, the two second valve bodies (607) are symmetrical with respect to the bearing plate (608), the two ends of the temporary storage tube (606) are respectively in contact with the two ends of the inner wall of the fixed frame (601), the inner wall of the temporary storage tube (606) is flush with the inner wall of the air inlet hole (604), and the end of the gas injection tube (612) close to the U-shaped block (602) is slidably arranged on the inner wall of the air inlet hole (604) and the temporary storage tube (606), and the two ends of the gas injection tube (612) are respectively in communication with the inside of the gas injection pipe (609) and the temporary storage tube (606).

2. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: The sampling assembly (3) comprises a three-way pipe (301), a three-way valve (302), a ventilation pipe (303), a first valve body (304), a fixed pipe (305), a first accident chlorine negative pressure device (306) and a sampling pipe (307); a three-way pipe (301) is arranged outside the first filter (2); a three-way valve (302) is arranged on the three-way pipe (301); a ventilation pipe (303) is fixedly connected to one output end of the three-way pipe (301); the first valve body (304) is installed on the ventilation pipe (303); a sampling pipe (307) is fixedly connected to the input end of the three-way pipe (301); the other output end of the three-way pipe (301) is connected to the air inlet end of the first filter (2) through a pipeline; one end of the fixed pipe (305) is fixedly connected to the first accident chlorine negative pressure device (306); and a sampling pipe (307) is fixedly connected to the air inlet port of the three-way pipe (301).

3. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: A flow meter (11) and a fourth valve body (12) are installed on the reducer (4).

4. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: The second filter (5) comprises a Y-shaped tube (501), a mounting body (502) and a filter plate (503); the Y-shaped tube (501) is mounted on the gas outlet end of the reducer (4); the mounting body (502) is mounted on the lower end of the Y-shaped tube (501) via bolts; the filter plate (503) is fixedly connected to the upper end of the mounting body (502); the filter plate (503) is located at the center of the Y-shaped tube (501); and the filter plate (503) separates the gas inlet end and the gas outlet end of the Y-shaped tube (501) into two parts.

5. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: A valve body is installed on the air inlet pipe of the accident chlorine negative pressure system (9).

6. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: The collecting assembly (7) comprises a mounting tube (701), a hollow box (702), a mounting cylinder (703), a first collecting bottle (704) and a third valve body (705); the inner wall of the air outlet tube (605) is threadedly mounted with the hollow box (702), the other end of the hollow box (702) is fixedly connected to the mounting tube (701), the other end of the mounting tube (701) is threadedly mounted with a plurality of mounting cylinders (703), the air outlet end of the mounting cylinder (703) is fixedly connected to the first collecting bottle (704), and the mounting cylinder (703) is provided with a third valve body (705).

7. A multi-channel chlorine purity automatic switching online detection device according to claim 1, characterized in that: The gas chromatograph (8) is provided with a first analysis mechanism (801) and a second analysis mechanism (802).

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