Limited space multi-point gas sampling device

Abstract

This utility model discloses a multi-point gas sampling device in a confined space in the field of air sampling technology. It includes an air pump, a multi-way valve, and a sampling tube. The multi-way valve has multiple inlets and an outlet. Each inlet is equipped with an extension tube for guiding to each sampling position. The outlet is connected to the inlet of the air pump, and the outlet of the air pump is equipped with a sampling tube. By setting up the multi-way valve, multiple extension tubes can be connected at one time through the multi-way valve and the connecting tube, so as to achieve the purpose of switching freely for different sampling points. This method can avoid the problems of air being drawn into the detection port and gas leakage caused by switching the extension tube back and forth during the detection process, resulting in long detection time and inaccurate results. It can also effectively prevent the leakage of harmful gases during the process of disconnecting and changing the air tube.

Description

Technical Field

[0001] This utility model relates to the field of air sampling, specifically to a multi-point gas sampling device in a confined space. Background Technology

[0002] Regular air sampling is required in grain warehouses for the following purposes: to monitor the concentration of fumigation gases such as phosphine to ensure their effectiveness in killing insects without posing a safety threat to workers; to test oxygen and carbon dioxide levels to evaluate the effectiveness of green pest control technologies such as low-oxygen storage; and to provide early warning of flammable gases such as methane to prevent dust explosions.

[0003] Sampling methods typically use a sampling gas pump in conjunction with extension tubes and gas collection bags. Operators fix multiple extension tubes at different depths and gas layers inside the chamber for fixed-point sampling. The sampling gas pump is connected to each extension tube in turn to extract gas. This sampling method has the following drawbacks: switching extension tubes back and forth during the detection process can cause air to be drawn into the sampling port, or residual detection gas in the extension tubes may leak out, resulting in long collection times and inaccurate results. The leaked gas may also lead to phosphine leakage. Utility Model Content

[0004] The purpose of this invention is to provide a multi-point gas sampling device in a confined space, which solves the problem of the need for frequent switching of extension tubes in existing sampling devices.

[0005] This utility model achieves the above objectives through the following technical solutions: A confined space multi-point gas sampling device includes an air pump, a multi-way valve, and a sampling tube. The multi-way valve has multiple inlet ports and an outlet port. Each inlet port is equipped with an extension tube for guiding to a different sampling location. The outlet port is connected to the inlet of the air pump, and the outlet of the air pump is equipped with a sampling tube.

[0006] As a preferred embodiment of this utility model, it also includes a housing and a connecting pipe that extends through the housing. The connecting pipe is connected to the inlet and is used to install an extension tube. This embodiment facilitates carrying and moving by encapsulating each component inside the housing.

[0007] As a preferred embodiment of this utility model, a cooling fan and a power supply are also provided inside the housing, and several buttons are also provided on the housing for controlling the opening and closing of the power supply, multi-way valve, air pump or cooling fan. By encapsulating each component inside the housing, it is convenient to carry and move.

[0008] As a preferred embodiment of this utility model, the air pump is a diaphragm pump.

[0009] In a preferred embodiment of this utility model, the inlet of the air pump is connected to the outlet of the multi-way valve through a first pipe, and a dust filter is also provided on the first pipe. The outlet of the air pump is connected to the sampling tube through a second pipe, and the dust filter is used to filter dust in the gas.

[0010] As a preferred embodiment of this utility model, a four-way valve is provided between the inlet, outlet, first pipe, and second pipe of the air pump to change the air pumping direction. By setting the four-way valve, after sampling is completed, the air pump direction can be reversed to push the gas back, eliminating the residual gas in the first pipe, second pipe, and multi-way valve, and preventing the intake of residual gas from the previous sampling cycle in the next sampling cycle, which would cause inaccurate detection.

[0011] As a preferred embodiment of this utility model, the sampling tube is provided with a valve block that is opened and closed by pressure difference. Both ends of the sampling tube are provided with side grooves, and both ends of the valve block are provided with elastic elements to keep the valve block in the middle of the sampling tube normally closed. By setting a normally closed valve block, it opens when suction force is generated on both sides of the valve block to prevent the leakage of harmful gases in the sampling interval.

[0012] The beneficial effects of this utility model are as follows: by setting a multi-way valve, multiple extension tubes can be connected at one time through the multi-way valve and the connecting pipe, so as to achieve the purpose of switching freely for different sampling points. This method can avoid the problems of air being drawn into the detection port and gas leakage caused by switching the extension tube back and forth during the detection process, resulting in long detection time and inaccurate results. It can also effectively prevent the leakage of harmful gases during the process of disconnecting and changing the gas tube. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a top view of the internal structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the sampling tube of this utility model; Figure 4 This is a schematic diagram of the four-way valve connection of this utility model; In the diagram: 1. Housing; 2. Air pump; 201. Inlet; 202. Outlet; 3. Multi-way valve; 4. First pipe; 5. Second pipe; 6. Sampling tube; 601. Valve block; 602. Elastic element; 603. Side groove; 7. Dust filter; 8. Four-way valve; 9. Button; 10. Cooling fan; 11. Connecting pipe; 12. Extension pipe; 13. Power supply. Detailed Implementation

[0014] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0015] Example 1 like Figure 1-4 As shown, a multi-point gas sampling device in a confined space includes a gas pump 2, a multi-way valve 3, and a sampling tube 6. The multi-way valve 3 has multiple inlet ports and an outlet port. Each of the multiple inlet ports is provided with an extension tube 12 for guiding to each sampling position. The outlet port is connected to the inlet 201 of the gas pump 2, and the outlet 202 of the gas pump 2 is provided with the sampling tube 6.

[0016] In this embodiment, by setting up a multi-way valve 3, multiple extension tubes 12 can be connected at once through the multi-way valve 3 and the connecting pipe 11. Before the test, all sampling point extension tubes 12 are connected. Then, the air pump 2 is started, and the conduction inlet of the multi-way valve 3 can be switched at will to switch different extension tubes 12 for different sampling points, achieving the purpose of switching freely. A sampling bag is set in the sampling tube 6 to collect gas. This method can avoid the problems of air being drawn into the detection port and gas leakage caused by switching the extension tubes 12 back and forth during the test, resulting in long test time and inaccurate results. It can also effectively avoid the leakage of harmful gases during the process of disconnecting and changing air tubes.

[0017] Preferably, the sampling device further includes a housing 1 and a connecting pipe 11 extending through the housing. The connecting pipe 11 is connected to the suction port and is used to install the extension pipe 12. The housing 1 is also provided with a cooling fan 10 and a power supply 13. The housing 1 is also provided with several buttons 9, which are used to control the opening and closing of the power supply 13, the multi-way valve 3, the air pump 2 or the cooling fan 10. In this embodiment, by encapsulating each component in the housing 1, it is convenient to carry and move. The power supply 13 is also provided with a charging port.

[0018] Preferably, in this embodiment, the air pump 2 is a diaphragm pump, the cooling fan 10 is located near the diaphragm pump, and the housing 1 has heat dissipation holes.

[0019] Since there may be dust in the air at the sampling point, in order to solve this problem, as a preferred solution, the inlet 201 of the air pump 2 and the outlet of the multi-way valve 3 are connected through a first pipe 4, and a dust filter 7 is also provided on the first pipe 4. The outlet 202 of the air pump 2 is connected to the sampling tube 6 through a second pipe 5. When sampling, the gas passes through the dust filter 7, effectively filtering the dust.

[0020] Preferably, a four-way valve 8 is provided between the inlet 201, outlet 202, first pipe 4, and second pipe 5 of the air pump 2 to change the pumping direction of the air pump 2. By setting the four-way valve 8, after sampling is completed, the air pump 2 can be reversed to push the gas back, eliminating the residual gas in the first pipe 4, second pipe 5, and multi-way valve 3, and preventing the intake of residual gas from the previous sampling cycle in the next sampling cycle, which would cause inaccurate detection.

[0021] Furthermore, a valve block 601 that is opened and closed by differential pressure is provided inside the sampling tube 6. Side grooves 603 are provided at both ends of the sampling tube 6. Elastic elements 602 are provided at both ends of the valve block 601 to keep the valve block 601 in the middle of the sampling tube 6 and normally closed. By setting the normally closed valve block 601, it opens when suction force is generated on both sides of the valve block 601 to prevent the leakage of harmful gases in the sampling interval.

[0022] Please see Figure 2-4 During sampling, first connect each extension tube 12 ( Figure 2 (Only one is shown in the image). During implementation, each connecting pipe 11 is equipped with an extension pipe 12, which extends to different sampling points. Then, the start / stop or opening / closing of each component is controlled by button 9. A sampling bag is set in the sampling pipe 6, one of the multi-way valves 3 is opened, the air pump 2 is turned on to draw air, and the four-way valve 8 is activated. Figure 4 As shown, gas enters the sampling bag. After sampling, the air pump 2 stops, valve block 601 remains closed, multi-way valve 3 remains unchanged, and four-way valve 8 switches positions and reverses direction to draw air from the second pipe 5 and pump it out into the extension pipe 12. This cleans the residual gas in the first pipe 4, the second pipe 5, and the multi-way valve 3. Then, four-way valve 8 returns to its original direction, and multi-way valve 3 switches to another extension pipe 12 to sample the second sampling point. This process is repeated to complete sampling at multiple sampling points.

[0023] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. 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 modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A multi-point gas sampling device in a confined space, characterized in that, It includes an air pump (2), a multi-way valve (3) and a sampling tube (6). The multi-way valve (3) has multiple inlet ports and an outlet port. Each inlet port is provided with an extension tube (12) for guiding to each sampling position. The outlet port is connected to the inlet (201) of the air pump (2). The outlet (202) of the air pump (2) is provided with a sampling tube (6).

2. The confined space multi-point gas sampling device according to claim 1, characterized in that, It also includes a housing (1) and a connecting pipe (11) that extends through the housing, the connecting pipe (11) being connected to the inlet and used for installing an extension pipe (12).

3. The confined space multi-point gas sampling device according to claim 2, characterized in that, The housing (1) is also equipped with a cooling fan (10) and a power supply (13). Several buttons (9) are also provided on the housing (1) for controlling the opening and closing of the power supply (13), multi-way valve (3), air pump (2) or cooling fan (10).

4. A multi-point gas sampling device in a confined space according to claim 1, characterized in that, The air pump (2) is a diaphragm pump.

5. A multi-point gas sampling device in a confined space according to claim 1, characterized in that, The inlet (201) of the air pump (2) is connected to the outlet of the multi-way valve (3) through a first pipe (4), and a dust filter (7) is also provided on the first pipe (4). The outlet (202) of the air pump (2) is connected to the sampling tube (6) through a second pipe (5).

6. A multi-point gas sampling device in a confined space according to claim 5, characterized in that, A four-way valve (8) is provided between the inlet (201), outlet (202), first pipe (4), and second pipe (5) of the air pump (2) for changing the pumping direction of the air pump (2).

7. A confined space multi-point gas sampling device according to claim 6, characterized in that, The sampling tube (6) is provided with a valve block (601) that is opened and closed by pressure difference. Both ends of the sampling tube (6) are provided with side grooves (603). Both ends of the valve block (601) are provided with elastic elements (602) to keep the valve block (601) in the middle of the sampling tube (6) normally closed.

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