CN115144230A - Multi-inlet multi-outlet gas closed-loop multi-point sampling control device and control method - Google Patents
Multi-inlet multi-outlet gas closed-loop multi-point sampling control device and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 10
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- 238000001514 detection method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a multi-inlet multi-outlet gas closed-loop multipoint sampling control device and a control method, wherein the multi-inlet multi-outlet gas closed-loop multipoint sampling control device comprises a plurality of sampling gas inlets and a plurality of sampling gas return ports, a circulating gas outlet and a circulating gas inlet which are correspondingly connected with a gas analyzer, a purging gas inlet, a purging gas outlet, a first air pump, a second air pump, two groups of gas inlet channels and two groups of gas return channels; and the connecting pipelines are respectively provided with an electromagnetic valve for controlling the on-off of the gas circuit. According to the invention, the gas return channel is additionally arranged, so that the gas sampled by the sampling box can be discharged into the sampling box after the analysis is finished, and the influence on the measurement result caused by the negative pressure of the gas in the sampling box and the air entering due to long-term measurement can be avoided; by additionally arranging a purging pipeline, the electromagnetic valve and the common pipeline can be effectively purged, interference caused by different gas concentrations of different sampling boxes is avoided, and the measurement precision can be improved; the double-pump sampling can save the air exhaust waiting time and the purging waiting time, and greatly improves the sampling efficiency.
Description
Technical Field
The invention relates to the technical field of gas sampling detection, in particular to a multi-input multi-output gas closed-loop multi-point sampling control device and a control method.
Background
Greenhouse gases are the main cause of causing greenhouse effect and global climate change, and with the global increasing importance on greenhouse gas emission, the research on related contents of greenhouse gases is of great significance. The research on greenhouse gases generated by plants such as crops, aquatic weeds and the like is very important, at present, a plurality of projects are researched for generating the greenhouse gases by the plants such as the crops, the vegetations, the aquatic weeds and the like through scientific researches, because the plants are exposed in the air, in order to measure the gases generated by the plants, the plants need to be covered for a period of time by a static box method, then the concentration of the gases is measured on line by using an instrument, and because a plurality of plants and a plurality of samples need to be measured, in order to realize high-efficiency analysis and measurement, a multi-point sampler is generally adopted. The multipoint samplers currently used in the market have three major drawbacks: 1. the purging function is not provided, and different sampling point gases enter a common pipeline and an electromagnetic valve, so that interference exists to influence the measurement precision; 2, a single pump is adopted for pumping, so that the sampling efficiency is low; 3. the volume of the sealed sampling box is limited, and long-term air suction can lead to gas reduction of the sampling box, air pressure reduction and air entering to influence the measurement result.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides a multi-inlet multi-outlet gas closed-loop multi-point sampling control device and a control method, wherein gas sampled by a sampling box is discharged into the sampling box after analysis is finished, so that the phenomenon that the gas negative pressure in the sampling box is caused by long-term measurement to cause air to enter the sampling box to influence the measurement result can be avoided; the electromagnetic valve and the common pipeline can be effectively purged, so that the interference caused by different gas concentrations of different sampling boxes is avoided, and the measurement precision is improved; the air exhaust waiting time and the purging waiting time can be saved, and the sampling efficiency is greatly improved.
The invention adopts the following technical scheme:
a multi-inlet multi-outlet gas closed loop multipoint sampling control device comprises a plurality of sampling gas inlets which are correspondingly connected with gas outlets of a plurality of sampling boxes one by one, a plurality of sampling gas return ports which are correspondingly connected with gas return ports of the plurality of sampling boxes one by one, a circulating gas outlet and a circulating gas inlet which are correspondingly connected with a gas inlet and a gas outlet of a gas analyzer, a purging gas inlet, a purging gas outlet, a first air pump and a second air pump, wherein the purging gas inlet, the purging gas outlet, the first air pump and the second air pump are correspondingly connected with a purging gas pipeline;
the sampling gas inlets and the purging gas inlets are communicated with the circulating gas outlet through two groups of gas inlet channels, each group of gas inlet channels at least comprises a plurality of branch gas inlet channels which are respectively communicated with the sampling gas inlets and the purging gas inlets, the plurality of branch gas inlet channels are provided with a common gas outlet, and the common gas outlet is communicated with the circulating gas outlet; the sampling air return ports and the purging air outlets are respectively communicated with the circulating air inlet through two groups of air return channels, each group of air return channels at least comprises a plurality of branch air return channels respectively communicated with the sampling air return ports and the purging air outlets, the branch air return channels are provided with a common air inlet, and the common air inlet is communicated with the circulating air inlet; each branch air inlet channel and each branch air return channel are respectively provided with an electromagnetic valve for controlling the on-off of the air path;
the air inlet ends of the first air pump and the second air pump are respectively communicated with the common air outlets of the two groups of air inlet channels through pipelines, the air outlet ends of the first air pump and the second air pump are respectively communicated with the common air inlets of the two groups of air return channels through pipelines, and control electromagnetic valves for controlling the on-off of air paths are arranged on the pipelines; the first air pump and the second air pump are connected between the common air outlet and the circulating air outlet of the two groups of air inlet channels;
the air-suction control system also comprises control electromagnetic valves which are respectively used for controlling the on-off of the air path between the air outlet end of the first air suction pump and the air outlet of the second air suction pump and the air path between the circulating air inlet and the public air inlet of the two sets of air return channels.
Furthermore, the multi-inlet multi-outlet gas closed loop multi-point sampling control device further comprises a relay module and a server terminal, wherein the relay module is electrically connected with and controls the electromagnetic valves, the control electromagnetic valves and the first and second air suction pumps to be opened or closed, and the server terminal is in communication connection with the relay module and transmits control instructions to the relay module.
Furthermore, the multi-input multi-output gas closed loop multi-point sampling control device further comprises a switch, wherein the switch is in communication connection with the relay module and provides a plurality of communication connection interfaces for realizing communication between the server terminal and the relay module.
Furthermore, the multi-inlet multi-outlet gas closed loop multi-point sampling control device further comprises a switching power supply, and the switching power supply is used for converting alternating current into direct current to supply power for the electromagnetic valve, the control electromagnetic valve, the first air pump, the second air pump, the relay module and the switch.
Further, the communication connection interface is an internet access.
Furthermore, the electromagnetic valve and the control electromagnetic valve are both two-position two-way electromagnetic valves.
Further, the multi-inlet multi-outlet gas closed-loop multi-point sampling control device further comprises a case, the plurality of sampling gas inlets, the plurality of sampling gas return ports, the circulating gas outlet, the circulating gas inlet, the purging gas outlet and the net port are all arranged on the case, a power socket and a power switch are further arranged on the case, the power socket and the power switch are electrically connected with a switch power supply, and the electromagnetic valve group, the control electromagnetic valve, the relay module, the switch and the switch power supply are all arranged in the case.
Further, the purge air inlet is connected with a nitrogen pipeline or a zero air pipeline.
Further, the server terminal is provided with a human-computer interface for human-computer interaction.
A control method based on the multi-input multi-output gas closed-loop multi-point sampling control device comprises the following steps:
step 1, switching on an electromagnetic valve of a branch gas inlet channel corresponding to a purging gas inlet in a first group of gas inlet channels and an electromagnetic valve of a branch gas return channel corresponding to a purging gas outlet in a first group of gas return channels, and switching on a gas circuit between a first air pump and the first group of gas inlet channels, a gas circuit between the first air pump and a circulating gas outlet and a gas circuit between a circulating gas inlet and the first group of gas return channels; starting a first air pump to enable purge gas to enter from a purge gas inlet, purging the electromagnetic valves, the common pipeline and the gas analyzer measuring cavity of the first group of gas inlet channels and the first group of gas return channels, and discharging the purge gas from the purge gas outlet;
when the first air pump works, the electromagnetic valves of the branch air inlet channels corresponding to the purging air inlets in the second group of air inlet channels and the electromagnetic valves of the branch air return channels corresponding to the purging air outlets in the second group of air return channels are communicated, the electromagnetic valves between the second air pump and the second group of air inlet channels and the second group of air return channels are communicated, the second air pump is started, and the electromagnetic valves and the common pipelines of the second group of air inlet channels and the second group of air return channels are purged; after purging is finished, closing the electromagnetic valve of the branch gas inlet channel corresponding to the purging gas inlet in the second group of gas inlet channels and the electromagnetic valve of the branch gas return channel corresponding to the purging gas outlet in the second group of gas return channels; opening the electromagnetic valve of the corresponding branch air inlet channel in the second group of air inlet channels corresponding to the second secondary sequence sampling box and the electromagnetic valve of the corresponding branch air return channel in the second group of air return channels; the gas analyzer realizes that the gas of the second-order sampling box circulates in the pipeline while the gas of the first-order sampling box is sampled and analyzed by the gas analyzer.
As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:
firstly, the gas return channel and the circulating gas inlet are additionally arranged, so that the gas sampled by the sampling box is discharged into the sampling box after the analysis is finished, the negative pressure of the gas in the sampling box caused by long-term measurement can be avoided, air enters due to poor sealing, the measurement result is influenced, and the measurement precision can be ensured.
The second, through set up one way on the basis of admitting air, return gas pipeline and sweep the pipeline, can effectively sweep solenoid valve and public line, avoid because of the interference that the gas concentration difference of different sampling boxes leads to, can improve measurement accuracy.
Thirdly, two groups of gas inlet channels, two groups of gas return channels and two air pumps are arranged, when one air pump is used for sampling gas in a sampling box and sending the gas into a gas analyzer for analysis, the gas in the next sampling box can be pumped into a pipeline for circulation after the gas remained in the electromagnetic valve and the common pipeline is swept by the other air pump, and the sampling by the two pumps can save the air-pumping waiting time and the sweeping waiting time, thereby greatly improving the sampling efficiency and the measurement precision; sampling in turn of many sampling boxes can improve equipment utilization greatly, realizes gaseous high-efficient automatic sampling detection, need not the experimenter on duty, can guarantee measurement accuracy.
Fourthly, by arranging the switch, more communication connection interfaces can be provided for connecting the server terminal, and the use is more flexible.
Fifthly, the structure is simple, the expansion is convenient, and the addition of the sampling box can correspondingly increase the branch air inlet channel, the branch air return channel and the corresponding electromagnetic valve.
Drawings
Fig. 1 is a three-dimensional structural sectional view of a multi-inlet multi-outlet gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention;
fig. 2 is a perspective view of the overall structure of the multi-inlet multi-outlet gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention;
FIG. 3 is a rear view of a multi-in multi-out gas closed loop multi-point sampling control apparatus according to embodiment 1 of the present invention;
fig. 4 is a schematic view of a gas path connection structure of the multi-input multi-output gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention, which shows that the gas path is conducted in a first operating state;
fig. 5 is a schematic view of a gas path connection structure of the multi-input multi-output gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention, and the gas path connection structure is shown in the figure to be conducted in a second operating state;
fig. 6 is a schematic view of a gas path connection structure of the multi-input multi-output gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention, which shows that a gas path is conducted in a third operating state;
fig. 7 is a schematic view of a gas path connection structure of the multi-in multi-out gas closed-loop multi-point sampling control device in embodiment 1 of the present invention, which shows that the gas path is conducted in a fourth operating state.
In the figure: 1. the air conditioner comprises a case, 101, a bottom plate, 102, a front panel, 103, a rear panel, 2, a sampling air inlet, 3, a sampling air return port, 4, a circulating air outlet, 5, a circulating air inlet, 6, a purging air inlet, 7, a purging air outlet, 8, a first air pump, 9, a second air pump, 10, a switching power supply, 11, a relay module, 12, a switch, 13, a branch air inlet channel, 14, a branch air return channel, 15, a net port, 16, a three-in-one switch and 17, an electromagnetic valve group.
Detailed Description
The invention is further described below by means of specific embodiments.
Example 1
Referring to fig. 1 to 7, the multi-inlet multi-outlet gas closed-loop multipoint sampling control device of the invention comprises a case 1, eleven sampling gas inlets 2 connected with gas outlets of eleven sampling boxes in a one-to-one correspondence manner, eleven sampling gas return ports 3 connected with gas return ports of eleven sampling boxes in a one-to-one correspondence manner, a circulating gas outlet 4 and a circulating gas inlet 5 respectively connected with a gas inlet and a gas outlet of a gas analyzer in a corresponding manner, a purging gas inlet 6 connected with a purging gas pipeline in a corresponding manner, a purging gas outlet 7, a first air pump 8 and a second air pump 9, a switching power supply 10, a relay module 11, a server terminal and a switch 12. The sampling box is a closed sampling box.
Eleven sampling air inlets 2 and one purging air inlet 6 are communicated with the circulating air outlet 4 through two groups of air inlet channels which are connected in parallel through A, B, each group of air inlet channels comprises twelve branch air inlet channels 13 which are respectively communicated with the sampling air inlets 2 and the purging air inlets 6, the twelve branch air inlet channels 13 are provided with a common air outlet, and the common air outlet is communicated with the circulating air outlet 4 through a pipeline. Eleven sampling air return ports 3 and one purging air outlet 7 are respectively communicated with the circulating air inlet 5 through C, D two groups of air return channels which are connected in parallel, each group of air return channels comprises twelve branch air return channels 14 which are respectively communicated with the sampling air return ports 3 and the purging air outlet 7, each twelve branch air return channels 14 are provided with a common air inlet, and the common air inlets are communicated with the circulating air inlet 5 through pipelines; each branch air inlet channel 13 is provided with an electromagnetic valve 1-12 for controlling the on-off of the air path, each branch air return channel 14 is provided with an electromagnetic valve 13-24 for controlling the on-off of the air path, and twelve electromagnetic valves of each group of air inlet channel and air return channel form an electromagnetic valve group 17. The first air pump 8 and the second air pump 9 are connected between the common air outlet of the two groups of air inlet channels A, B and the circulating air outlet 4. The air inlet ends of the first air pump 8 and the second air pump 9 are respectively communicated with the public air outlets of the two sets of air inlet channels through pipelines, the air outlet ends are respectively communicated with the public air inlets of the two sets of air return channels through pipelines, and the pipelines are respectively provided with control electromagnetic valves V1-V8 for controlling the on-off of the air channels. The air-conditioner also comprises control electromagnetic valves V9 and V10 which are respectively used for controlling the on-off of air paths between the air outlet ends of the first air pump 8 and the second air pump 9 and the circulating air outlet 4, and control electromagnetic valves V11 and V12 which are used for controlling the on-off of air paths between the circulating air inlet 5 and the public air inlets of the two groups of air return channels. The electromagnetic valves of the electromagnetic valve groups and the control electromagnetic valves V1-V12 are two-position two-way electromagnetic valves, and are powered on and powered off. The purging air inlet 6 is connected with a nitrogen pipeline or a zero air pipeline, and the purging air outlet 7 is communicated with the outside.
The relay module 11 is electrically connected with and controls the opening or closing of the electromagnetic valves of the electromagnetic valve groups, the control electromagnetic valves V1-V12, the first air pump 8 and the second air pump 9, and the server terminal is in communication connection with the relay module 11 and transmits control instructions to the relay module 11. The switch 12 is communicatively connected to the relay module 11, and two network ports 15 are provided, and the network ports 15 are used for connecting servers and realizing communication between the server terminals and the relay module 11. The server terminal is provided with a human-computer interface for human-computer interaction. The relay module 11 adopts the prior art, and realizes switching control through a communication protocol.
The switching power supply 10 is used for converting 220V alternating current into 24V direct current to supply power to the electromagnetic valves of the electromagnetic valve groups, the control electromagnetic valves V1-V12, the first air extracting pump 8, the second air extracting pump 9, the relay module 11 and the exchanger 12.
The chassis 1 is a standard industrial chassis comprising a backplane 101, a front panel 102 and a back panel 103. Eleven sampling air inlet 2, eleven sampling return air port 3, circulation gas outlet 4, circulation income gas port 5, sweep the air inlet 6, sweep gas outlet 7, net gape 15 and all install on quick-witted case 1 rear panel 103, still install trinity switch 16 on quick-witted case 1 rear panel 103, and trinity switch 16 includes power socket and switch, and power socket and switch electricity connect switching power supply 10. The first air pump 8, the second air pump 9, the electromagnetic valve group, the control electromagnetic valves V1-V12, the relay module 11, the switch 12 and the switching power supply 10 are all arranged in the case 1 and are installed on a bottom plate 101 of the case 1. In this embodiment, the first air pump 8 and the second air pump 9 have small power and small volume, can be placed in the case 1, and are suitable for an application scenario in which the sampling distance is less than 150 meters. In the practical application process, the air pumps with different powers can be selected according to the sampling distance.
The working principle of the multi-inlet multi-outlet gas closed loop multi-point sampling control device is as follows: a user selects a measurement mode in a human-computer interface of a server terminal, the server terminal transmits a control command to the relay module 11 through the internet access 15, and the relay module 11 outputs a control signal to switch and control the opening or closing of the electromagnetic valves of the electromagnetic valve groups, the control electromagnetic valves V1-V12, the first air suction pump 8 and the second air suction pump 9, so that set sampling analysis tasks are executed according to a set sampling sequence.
Referring to fig. 4 to 7, in the present embodiment, the method for controlling closed-loop multipoint sampling of multiple input multiple output gases includes the following steps:
step 1, referring to fig. 4, after a user starts a task in a server terminal, switching on an electromagnetic valve 12 of a branch air inlet channel corresponding to a purge air inlet 6 in a group A air inlet channel and an electromagnetic valve 13 of a branch air return channel corresponding to a purge air outlet 7 in a group C air return channel, opening control electromagnetic valves V3, V9 and V12, and switching on an air path between a first air pump 8 and the group A air inlet channel, an air path between the first air pump 8 and a circulation air outlet 4 and an air path between a circulation air inlet 5 and the group C air return channel; starting a first air pump 8 to enable nitrogen or zero air to enter from a purge air inlet 6, purging the electromagnetic valve group, the public pipeline and the measurement cavity of the gas analyzer of the air inlet channel A and the air return channel C, and discharging purge gas from a purge air outlet 7;
referring to fig. 6, while the first suction pump 8 is operating, the electromagnetic valve 12 of the branch intake passage corresponding to the purge intake port in the group B intake passage and the electromagnetic valve 13 of the branch return passage corresponding to the purge outlet port in the group D return passage are turned on, opening control electromagnetic valves V2 and V8 between the second air pump and the second group of air inlet channels and the second group of air return channels, starting the second air pump 9, and starting to purge the electromagnetic valve groups and the common pipelines of the B group of air inlet channels and the D group of air return channels; referring to fig. 7, after the purging is finished, closing the electromagnetic valves 12 of the air inlet passage group B and the electromagnetic valves 13 of the air return passage group D; opening the electromagnetic valve 10 of the corresponding branch air inlet channel in the B group air inlet channel and the electromagnetic valve 15 of the corresponding branch air return channel in the D group air return channel corresponding to the second order sampling box; the gas analyzer realizes that the gas of the second-order sampling box circulates in the pipeline while the gas of the first-order sampling box is sampled and analyzed by the gas analyzer.
Example 2
This example differs from example 1 in that: the first air pump 8 and the second air pump 9 adopt high-power air pumps, are large in size, are arranged outside the case 1, are suitable for long-distance sampling, and can be applied to coal mine gas detection sampling with sampling distance exceeding 1000 meters.
Example 3
This example differs from example 1 in that: the multi-inlet multi-outlet gas closed-loop multi-point sampling control device comprises twenty-three sampling gas inlets 2, twenty-three sampling gas return ports 3, a blowing gas inlet 6 and a blowing gas outlet 7. Each group of air inlet channels comprises twenty-four branch air inlet channels 13, and twenty-four electromagnetic valves are correspondingly arranged; each group of air return channels comprises twenty-four branch air return channels 14, and twenty-four electromagnetic valves are correspondingly arranged. Gas sampling analysis of twenty-three sampling boxes can be realized.
The above description is only three specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention using this concept shall fall within the scope of the present invention.
Claims (10)
1. A multi-inlet multi-outlet gas closed loop multipoint sampling control device is characterized by comprising a plurality of sampling gas inlets which are correspondingly connected with gas outlets of a plurality of sampling boxes one by one, a plurality of sampling gas return ports which are correspondingly connected with gas return ports of a plurality of sampling boxes one by one, a circulating gas outlet and a circulating gas inlet which are correspondingly connected with a gas inlet and a gas outlet of a gas analyzer respectively, a purging gas inlet, a purging gas outlet, a first air pump and a second air pump which are correspondingly connected with a purging gas pipeline;
the sampling gas inlets and the purging gas inlets are communicated with the circulating gas outlet through two groups of gas inlet channels, each group of gas inlet channels at least comprises a plurality of branch gas inlet channels which are respectively communicated with the sampling gas inlets and the purging gas inlets, the plurality of branch gas inlet channels are provided with a common gas outlet, and the common gas outlet is communicated with the circulating gas outlet; the sampling air return ports and the purging air outlets are respectively communicated with the circulating air inlet through two groups of air return channels, each group of air return channels at least comprises a plurality of branch air return channels respectively communicated with the sampling air return ports and the purging air outlets, the branch air return channels are provided with a common air inlet, and the common air inlet is communicated with the circulating air inlet; each branch air inlet channel and each branch air return channel are respectively provided with an electromagnetic valve for controlling the on-off of the air path;
the air inlet ends of the first air pump and the second air pump are respectively communicated with the common air outlets of the two groups of air inlet channels through pipelines, the air outlet ends of the first air pump and the second air pump are respectively communicated with the common air inlets of the two groups of air return channels through pipelines, and control electromagnetic valves for controlling the on-off of air paths are arranged on the pipelines; the first air pump and the second air pump are connected between the common air outlet and the circulating air outlet of the two groups of air inlet passages;
the air-suction control system also comprises control electromagnetic valves which are respectively used for controlling the on-off of the air path between the air outlet end of the first air suction pump and the air outlet of the second air suction pump and the air path between the circulating air inlet and the public air inlet of the two sets of air return channels.
2. The multi-input multi-output gas closed-loop multi-point sampling control device as claimed in claim 1, further comprising a relay module and a server terminal, wherein the relay module is electrically connected with and controls the electromagnetic valves, the control electromagnetic valves and the first and second air pumps to be opened or closed, and the server terminal is in communication connection with the relay module and transmits control instructions to the relay module.
3. The multiple-input multiple-output gas closed-loop multipoint sampling control device as claimed in claim 2 further comprising a switch communicatively coupled to the relay module and providing a plurality of communicatively coupled interfaces for enabling communication between the server terminal and the relay module.
4. A multi-input multi-output gas closed-loop multi-point sampling control device as claimed in claim 3, further comprising a switching power supply for converting ac power to dc power to power the solenoid valve, the control solenoid valve, the first pump, the second pump, the relay module and the switch.
5. The closed-loop multipoint sampling control device for multiple input multiple output gases as claimed in claim 4 wherein said communication interface is a network port.
6. The closed-loop multipoint sampling control device for multi-input multi-output gas as claimed in claim 1, wherein the solenoid valve and the control solenoid valve are both two-position two-way solenoid valves.
7. The multi-input multi-output gas closed-loop multi-point sampling control device as claimed in claim 5, further comprising a case, wherein the plurality of sampling gas inlets, the plurality of sampling gas return ports, the circulating gas outlet, the circulating gas inlet, the purging gas outlet and the network port are all disposed on the case, the case is further provided with a power socket and a power switch, the power socket and the power switch are electrically connected with a switching power supply, and the electromagnetic valve bank, the control electromagnetic valve, the relay module, the switch and the switching power supply are all disposed in the case.
8. The closed-loop multi-point sampling control device for multi-in and multi-out gas as claimed in claim 1, wherein the purge gas inlet is connected to a nitrogen line or a zero air line.
9. The multi-input multi-output gas closed-loop multi-point sampling control device as claimed in claim 2, wherein the server terminal has a human-machine interface for human-machine interaction.
10. A control method of the multi-input multi-output gas closed-loop multi-point sampling control device according to any one of claims 1 to 9, comprising the following steps:
step 1, switching on an electromagnetic valve of a branch air inlet channel corresponding to a purging air inlet in a first group of air inlet channels and an electromagnetic valve of a branch air return channel corresponding to a purging air outlet in a first group of air return channels, and switching on an air path between a first air suction pump and the first group of air inlet channels, an air path between the first air suction pump and a circulating air outlet, and an air path between the circulating air inlet and the first group of air return channels; starting a first air pump to enable purge gas to enter from a purge gas inlet, purging the electromagnetic valves, the common pipeline and the gas analyzer measuring cavity of the first group of gas inlet channels and the first group of gas return channels, and discharging the purge gas from the purge gas outlet;
step 2, after purging is finished, closing the electromagnetic valves of the branch gas inlet passages corresponding to the purging gas inlets in the first group of gas inlet passages and the electromagnetic valves of the branch gas return passages corresponding to the purging gas outlets in the first group of gas return passages; according to the sampling sequence of the set sampling analysis task, opening the electromagnetic valve of the corresponding branch gas inlet channel in the first group of gas inlet channels corresponding to the first sequence sampling box and the electromagnetic valve of the corresponding branch gas return channel in the first group of gas return channels; starting a gas analyzer to start sampling analysis on the gas in the first sequence sampling box;
when the first air pump works, the electromagnetic valves of the branch air inlet channels corresponding to the purging air inlets in the second group of air inlet channels and the electromagnetic valves of the branch air return channels corresponding to the purging air outlets in the second group of air return channels are communicated, the electromagnetic valves between the second air pump and the second group of air inlet channels and the second group of air return channels are communicated, the second air pump is started, and the electromagnetic valves and the common pipelines of the second group of air inlet channels and the second group of air return channels are purged; after purging is finished, closing the electromagnetic valve of the branch gas inlet channel corresponding to the purging gas inlet in the second group of gas inlet channels and the electromagnetic valve of the branch gas return channel corresponding to the purging gas outlet in the second group of gas return channels; opening the electromagnetic valve of the corresponding branch air inlet channel in the second group of air inlet channels corresponding to the second secondary sequence sampling box and the electromagnetic valve of the corresponding branch air return channel in the second group of air return channels; the gas analyzer samples and analyzes the gas in the first sequence sampling box, and meanwhile, the gas in the second sequence sampling box circulates in the pipeline.
Step 3, after the gas analysis of the first sequence sampling box is finished, closing a gas path between the first air pump and the circulating gas outlet, and connecting a gas path between the second air pump and the circulating gas outlet; sampling analysis of the gas in the second-order sampling box is realized; simultaneously, the first air pump starts to purge the electromagnetic valves and the common pipeline of the first group of air inlet channels and the first group of air return channels and enables the gas of the third sequence sampling box to circulate in the pipeline; and repeating the steps until the set sampling analysis task is completed.
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| CN202210698229.1A CN115144230A (en) | 2022-06-20 | 2022-06-20 | Multi-inlet multi-outlet gas closed-loop multi-point sampling control device and control method |
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| CN116539819A (en) * | 2023-07-05 | 2023-08-04 | 广州宜南电子科技有限公司 | Sensor working channel and mode selection control system and method of gas detector |
| CN117330369A (en) * | 2023-11-24 | 2024-01-02 | 广东广业投资集团有限公司 | Finite space gas sampling monitoring system and sampling monitoring method |
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| CN209525139U (en) * | 2019-01-24 | 2019-10-22 | 广州森瑟机电设备有限公司 | A kind of dual probe switching sampler |
| CN214097353U (en) * | 2020-12-23 | 2021-08-31 | 常州长创力智能科技有限公司 | Multi-channel gas detection mechanism capable of highly reducing field state |
| CN114577548A (en) * | 2022-03-18 | 2022-06-03 | 北京致升科技有限公司 | Full-section multipoint flue gas constant-speed sampling system |
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| CN209525139U (en) * | 2019-01-24 | 2019-10-22 | 广州森瑟机电设备有限公司 | A kind of dual probe switching sampler |
| CN214097353U (en) * | 2020-12-23 | 2021-08-31 | 常州长创力智能科技有限公司 | Multi-channel gas detection mechanism capable of highly reducing field state |
| CN114577548A (en) * | 2022-03-18 | 2022-06-03 | 北京致升科技有限公司 | Full-section multipoint flue gas constant-speed sampling system |
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| CN116539819A (en) * | 2023-07-05 | 2023-08-04 | 广州宜南电子科技有限公司 | Sensor working channel and mode selection control system and method of gas detector |
| CN116539819B (en) * | 2023-07-05 | 2023-09-01 | 广州宜南电子科技有限公司 | Sensor working channel and mode selection control system and method of gas detector |
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