Multi-channel automatic sampling device
By designing a multi-channel automatic sampling device, using a check valve and solenoid valve to control the gas flow, and combining a single-chip controller to realize automatic timing and quantitative sampling, the problem of low single-channel sampling efficiency in the existing technology is solved and the work efficiency of operators is improved.
Patent Information
- Application Number
- CN202422296352.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-19
AI Technical Summary
Existing air detection equipment can only sample in one channel, and cannot achieve multi-channel timing sampling, resulting in operators needing to frequently replace sampling tubes to reduce working efficiency.
A multi-channel automatic sampling device is designed, including an intake pipe, an outlet pipe and multiple side-by-side sampling channels. Each channel is equipped with a check valve and a solenoid valve to automatically collect sample gas regularly and quantitatively through a single-chip controller.
Multi-channel automatic timing and quantitative sampling of sample gas is realized, reducing the repetitive work of operators and improving work efficiency.
Smart Images
Figure CN223166413U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of indoor and outdoor air environment detection, in particular to a multi-channel automatic sampling device. Background Art
[0002] In the field of air environment detection, when detecting the content of polluted gases in the air (such as VOCs, formaldehyde, etc.), generally Tenax gas adsorption tubes, Dnph gas adsorption tubes or absorption liquid tubes (for formaldehyde) etc. (the above three devices will be collectively referred to as enrichers hereinafter) are used. When collecting gases whose concentration may change, sampling needs to be carried out at regular intervals. When the entire detection cycle is relatively long, several sampling operations are required.
[0003] Through market research, under the existing technical conditions, each gas path of the commercially available sampler has only one channel and cannot realize the function of multi-channel timed sampling of the sampled gas in a single path. The limitations of the existing commercially available devices make it necessary for the test personnel to replace the sampling tube regularly during the sampling process, which takes up a lot of energy of the operators and reduces the work efficiency. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a multi-channel automatic sampling device, so as to solve the foregoing problems existing in the prior art.
[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0006] A multi-channel automatic sampling device includes an air inlet pipe, an air outlet pipe and sampling channels; at least two sampling channels arranged in parallel are connected between the air inlet pipe and the air outlet pipe, and a one-way valve and a solenoid valve are sequentially arranged at intervals along the direction of the internal gas flow on the sampling channels; each sampling channel can be automatically opened and closed, so as to realize automatic timed and quantitative sampling of the sampled gas.
[0007] Preferably, on the sampling channel, the enricher for sampling the sampled gas is located between the one-way valve and the solenoid valve.
[0008] Preferably, on the air outlet pipe, a filter, an electronic flowmeter, a buffer and a sampling pump are sequentially arranged at intervals along the direction of the internal gas flow;
[0009] In the direction of the internal gas flow of the air outlet pipe, the filter is located downstream of the connection point between the sampling channel and the air outlet pipe.
[0010] Preferably, the device further includes a single-chip microcomputer controller, and the solenoid valve, the electronic flowmeter and the sampling pump are all connected to the single-chip microcomputer controller.
[0011] The beneficial effects of the present utility model are as follows: The device has multiple sampling channels for collecting sample gas, and each channel can be automatically opened and closed to achieve automatic timed and quantitative sampling of the sample gas, thus providing convenience for the operator and liberating the operator from the work that requires timing. Description of the Drawings
[0012] Figure 1 It is a structural diagram of a multi-channel automatic sampling device in an embodiment of the present utility model.
[0013] In the figure: 1, intake pipe; 2, one-way valve; 3, enricher; 4, solenoid valve; 5, filter; 6, electronic flowmeter; 7, buffer; 8, sampling pump; 9, outlet pipe; 10, single-chip microcomputer controller. Specific Embodiments
[0014] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0015] In this embodiment, in order to provide convenience for the operator and liberate the operator from the work that requires timing, a multi-channel automatic sampling device is provided. The device has multiple channels for single-channel sampled gas and can achieve timed and fixed-flow sampling work.
[0016] As Figure 1 shown, the multi-channel automatic sampling device specifically includes an intake pipe 1, an outlet pipe 9 and a sampling channel; at least two sampling channels arranged in parallel are connected between the intake pipe 1 and the outlet pipe 9, and a one-way valve 2 and a solenoid valve 4 are sequentially arranged at intervals along the direction of the internal gas flow on the sampling channel.
[0017] In this embodiment, the intake pipe 1 is connected to the pipeline or space where the gas needs to be collected to take gas, and the intake pipe 1 is connected with multiple sampling channels (the number ≥ 2, and the specific number can be selected according to the actual situation). A one-way valve 2, an enricher 3 and a solenoid valve 4 are arranged on each sampling channel.
[0018] The function of the one-way valve 2 is to avoid gas cross-talk with other sampling channels, and at the same time avoid external gas from entering when other sampling channels do not have an enricher 3 installed, so as to ensure the purity of the sample gas collected in the sampling channel. The one-way valve 2 adopts a polytetrafluoroethylene one-way valve, which can ensure the cleanliness of the device.
[0019] All pipe sections and pipe fittings between the air inlet of the sampling device and the enricher 3 are made of polytetrafluoroethylene and stainless steel.
[0020] The opening and closing of the sampling channels are controlled by the solenoid valve 4. The solenoid valve 4 is installed at the tail of the sampling pipeline, which can ensure that the solenoid valve 4 will not contaminate the sampled gas.
[0021] In this embodiment, a filter 5, an electronic flowmeter 6, a buffer 7 and a sampling pump 8 are sequentially arranged at intervals along the direction of the internal gas flow on the outlet pipe 9; in the direction of the internal gas flow of the outlet pipe 9, the filter 5 is located downstream of the connection point between the sampling channel and the outlet pipe 9. The sampled gas collected through the sampling channel sequentially passes through the filter 5, the electronic flowmeter 6, the buffer 7 and the sampling pump 8.
[0022] The electronic flowmeter 6 is a thermal electronic flowmeter, which is used to measure the flow rate of the sampled gas on the outlet pipe 9. The filter 5 is used to further filter the sampled gas, and the buffer 6 can buffer the sampled gas to make its pressure stable. The sampling pump 8 is used to drive the sampled gas to move in the outlet pipe 9.
[0023] In this embodiment, the device further includes a single-chip microcomputer controller 10. The solenoid valve 4, the electronic flowmeter 6 and the sampling pump 8 are all connected to the single-chip microcomputer controller 10. By controlling the sampling pump 8 (controlling parameters such as rotation speed and voltage), the flow rate of the sampled gas in the outlet pipe 9 is changed, forming a feedback with the single-chip microcomputer controller 10, so as to achieve the purpose of accurately controlling the flow rate of the sampled gas.
[0024] The single-chip microcomputer controller 10 can regularly turn on the sampling pump 8 and the solenoid valve 4 corresponding to the corresponding sampling channel according to the time set by the user, maintain the set flow rate, and achieve the purpose of sampling at a fixed time and fixed flow rate.
[0025] In this embodiment, one or more devices can be used for sampling the sampled gas. Each device has at least two sampling channels, so as to realize the multi-channel and time-scheduled sampling of the sampled gas.
[0026] By adopting the above technical solutions disclosed by the present utility model, the following beneficial effects are obtained:
[0027] The present utility model provides a multi-channel automatic sampling device. The device has multiple sampling channels for collecting the sampled gas. Each channel can be automatically opened and closed to realize the automatic sampling of the sampled gas at a fixed time and fixed quantity, thereby providing convenience for the operator and liberating the operator from the work that requires timing.
[0028] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model.
Claims
1. A multi-channel automatic sampling device, characterized in that: It includes an intake pipe, an outlet pipe and a sampling channel; at least two sampling channels arranged in parallel are connected between the intake pipe and the outlet pipe, and a one-way valve and a solenoid valve are sequentially arranged at intervals along the direction of the internal gas flow on the sampling channel; each sampling channel can be automatically opened and closed, so as to realize automatic timed and quantitative sampling of the sample gas.
2. The multi-channel automatic sampling device according to claim 1, wherein: On the sampling channel, an enricher for collecting the sample gas is located between the one-way valve and the solenoid valve.
3. The multi-channel automatic sampling device according to claim 2, wherein: On the outlet pipe, a filter, an electronic flowmeter, a buffer and a sampling pump are sequentially arranged at intervals along the direction of the internal gas flow. In the direction of the internal gas flow in the outlet pipe, the filter is located downstream of the connection point between the sampling channel and the outlet pipe.
4. The multi-channel automatic sampling device according to claim 3, characterized in that: The device further includes a single-chip microcomputer controller, and the solenoid valve, the electronic flowmeter and the sampling pump are all connected to the single-chip microcomputer controller.