CN116519392A - Multi-inlet multi-outlet gas closed loop multipoint sampling control device and control method - Google Patents
Multi-inlet multi-outlet gas closed loop multipoint sampling control device and control method Download PDFInfo
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- CN116519392A CN116519392A CN202310555608.XA CN202310555608A CN116519392A CN 116519392 A CN116519392 A CN 116519392A CN 202310555608 A CN202310555608 A CN 202310555608A CN 116519392 A CN116519392 A CN 116519392A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
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Abstract
The invention discloses a multi-inlet multi-outlet gas closed loop multipoint sampling control device and a control method, which relate to the technical field of gas sampling detection, wherein the device comprises: the plurality of sampling air inlets, the plurality of sampling air return ports, the circulating air outlet, the circulating air inlet, the purging air outlet, the net opening and the three-in-one switch are all arranged on a rear panel of the chassis; the two air sucking pumps, the switching power supply, the relay module, the switch, the plurality of control electromagnetic valves and the electromagnetic valve group are all arranged on the bottom plate of the case. The invention is additionally provided with the air return channel, and the air sampled by the sampling box is discharged into the sampling box after the analysis is finished, so that the influence of the negative pressure of the air in the sampling box, air entering and the influence on the measurement result caused by long-term measurement is avoided; the electromagnetic valve and the public pipeline are effectively purged by adding one purging pipeline, so that the interference caused by different gas concentrations of different sampling boxes is avoided, and the measurement precision can be improved; the double-pump sampling saves the waiting time of air extraction and the waiting time of purging, and greatly improves the sampling efficiency.
Description
The invention relates to a division application of a multi-inlet multi-outlet gas closed loop multipoint sampling control device and a control method, wherein the application number of the mother application is 202210698229.1, and the application date is 2022.06.20.
Technical Field
The invention relates to the technical field of gas sampling detection, in particular to a multi-inlet multi-outlet gas closed loop multi-point sampling control device and a control method.
Background
Greenhouse gases are the main reasons for causing greenhouse effect and global climate change, and as the global importance of greenhouse gas emission is increased, the research of the related content of the greenhouse gases is of great significance. The research on greenhouse gases generated by plants such as crops and aquatic plants is very important, and many projects are researched by scientific research at present, and as the plants are exposed to air, in order to measure the gases generated by the plants, the plants are covered for a period of time by adopting a static box method, and then the concentration of the gases is measured on line by using an instrument. Because of the need to measure multiple plants and multiple samples, a multi-point sampler is typically used to achieve efficient analysis and measurement.
The multipoint samplers currently used in the market have three major drawbacks: 1. without a purging function, different sampling point gases enter a common pipeline and an electromagnetic valve, and interference exists to influence the measurement accuracy; 2. the single pump is adopted for pumping, so that the sampling efficiency is low; 3. the sealed sampling box is limited in volume, and long-term air extraction can lead to reduction of gas in the sampling box, reduction of air pressure and air entering, so that the measurement result is influenced.
Disclosure of Invention
The invention provides a multi-inlet multi-outlet gas closed-loop multipoint sampling control device and a control method.
To achieve the above object, the present application provides the following solutions:
the device comprises a case, a plurality of sampling air inlets, a plurality of sampling air return ports, a circulating air outlet, a circulating air inlet, a purging air outlet, a net mouth, a three-in-one switch, a first air pump, a second air pump, a switching power supply, a relay module, a switch, a plurality of control electromagnetic valves and an electromagnetic valve group; the chassis comprises a bottom plate, a front panel and a rear panel;
the sampling air inlets, the sampling air return ports, the circulating air outlet, the circulating air inlet, the purging air outlet, the net opening and the three-in-one switch are all arranged on the rear panel; the first air pump, the second air pump, the switching power supply, the relay module, the switch, the plurality of control electromagnetic valves and the electromagnetic valve group are all arranged on the bottom plate;
the sampling air inlets are connected with the air outlets of the sampling boxes in a one-to-one correspondence manner, and the sampling air return openings are connected with the air return openings of the sampling boxes in a one-to-one correspondence manner; the circulating air outlet and the circulating air inlet are respectively and correspondingly connected with an air inlet and an air outlet of the gas analyzer; the purging air inlet and the purging air outlet are correspondingly connected with a purging gas pipeline; the sampling box is a closed sampling box;
the purging air inlet and the sampling air inlets are respectively communicated with the circulating air outlet through two groups of air inlet channels, each group of air inlet channels at least comprises a plurality of branch air inlet channels respectively communicated with the sampling air inlets and the purging air inlet, the branch air inlet channels are provided with public air outlets, and the public air outlets are communicated with the circulating air outlet; the purging air outlet and the plurality of sampling air return openings 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 which are respectively communicated with the sampling air return openings and the purging air outlet, the plurality of 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 circuit; the purging air inlet is connected with a nitrogen pipeline or a zero air pipeline, and the purging air outlet is communicated with the outside of the case;
the air inlet end of the first air pump and the air inlet end of the second air pump are respectively communicated with the public air outlets of the two groups of air inlet channels through pipelines, the air outlet end of the first air pump and the air outlet end of the second air pump are respectively communicated with the public air inlets of the two groups of air return channels through pipelines, and the pipelines are respectively provided with control electromagnetic valves for controlling the on-off of an air channel; 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.
Optionally, the relay module is electrically connected with and controls the opening or closing of each electromagnetic valve, the control electromagnetic valve, the first air pump and the second air pump;
the server terminal is in communication connection with the relay module and transmits a control instruction to the relay module; the server terminal is provided with a man-machine interface for man-machine interaction.
Optionally, the switch is communicatively connected to the relay module and provides a plurality of communication connection interfaces for enabling communication between the server terminal and the relay module.
Optionally, 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.
Optionally, the control electromagnetic valve is further used for controlling the gas path on-off between the gas outlet end of the first air pump, the gas outlet end of the second air pump and the circulating gas outlet, and the gas path on-off between the circulating gas inlet and the common gas inlets of the two groups of gas return channels;
the electromagnetic valves and the control electromagnetic valves are two-position two-way electromagnetic valves.
Optionally, the three-in-one switch comprises a power socket and a power switch, and the power socket and the power switch are electrically connected with a switching power supply.
In order to achieve the above purpose, the present invention also provides the following technical solutions:
a control method based on a multi-in multi-out gas closed loop multipoint sampling control device comprises the following steps:
step 1, switching on electromagnetic valves of branch air inlet channels corresponding to a blowing air inlet in a first group of air inlet channels and electromagnetic valves of branch air return channels corresponding to a blowing air outlet in a first group of air return channels, and switching on air paths between a first air pump and the first group of air inlet channels, air paths between the first air pump and a circulating air outlet and air paths 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 air inlet, purging the electromagnetic valves of the first group of air inlet channels and the first group of air return channels, the common pipeline and the measuring chamber of the gas analyzer, and discharging the purge gas from a purge air outlet;
step 2, after the purging is finished, closing electromagnetic valves of branch air inlet channels corresponding to the purging air inlets in the first group of air inlet channels and electromagnetic valves of branch air return channels corresponding to the purging air outlets in the first group of air return channels; according to the sampling sequence of the set sampling analysis task, opening electromagnetic valves of corresponding branch air inlet channels in a first group of air inlet channels corresponding to the first-time sampling box and electromagnetic valves of corresponding branch air return channels in a first group of air return channels; starting a gas analyzer, and starting to sample and analyze the gas of the first-time sequential sampling box;
when the first air pump works, the electromagnetic valve of the branch air inlet channel corresponding to the purging air inlet in the second group of air inlet channels and the electromagnetic valve of the branch air return channel corresponding to the purging air outlet in the second group of air return channels are connected, the electromagnetic valves between the second air pump and the second group of air inlet channels and between the second group of air return channels are connected, the second air pump is started, and purging is started to be carried out on the electromagnetic valves and the public pipelines of the second group of air inlet channels and the second group of air return channels; after the purging is finished, closing the electromagnetic valve of the branch air inlet channel corresponding to the purging air inlet in the second group of air inlet channels and the electromagnetic valve of the branch air return channel corresponding to the purging air outlet in the second group of air return channels; opening electromagnetic valves of corresponding branch air inlet channels in a second group of air inlet channels corresponding to the second sequence sampling boxes and electromagnetic valves of corresponding branch air return channels in a second group of air return channels; the gas analyzer is used for realizing the sampling analysis of the first-order sampling box gas and circulating the second-order sampling box gas in the pipeline;
step 3, closing a gas path between the first air pump and the circulating air outlet and connecting the gas path between the second air pump and the circulating air outlet after the gas analysis of the first sequential sampling box is completed; realizing the sampling analysis of the gas of the second order sampling box; simultaneously, the first air pump starts to purge the electromagnetic valves and the common pipelines of the first group of air inlet channels and the first group of air return channels, and circulates the gas of the third-order sampling box in the pipelines; and the process is repeated until the set sampling analysis task is completed.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a multi-inlet multi-outlet gas closed-loop multipoint sampling control device and a control method, wherein a sampling air inlet is in one-to-one correspondence with an air outlet of a sampling box, a sampling air return port is in one-to-one correspondence with an air return port of the sampling box, a circulating air outlet and a circulating air inlet are respectively in corresponding connection with an air inlet and an air outlet of a gas analyzer, and a purging air inlet and a purging air outlet are respectively in corresponding connection with a purging gas pipeline, wherein the sampling box is a closed sampling box. By additionally arranging the air return channel and the circulating air inlet, the gas which is sampled by the sampling box is discharged into the sampling box after being analyzed, the negative pressure of the gas in the sampling box caused by long-term measurement can be avoided, air is prevented from entering due to poor sealing, the measurement result is influenced, and the measurement accuracy can be ensured. Through add on the basis of admitting air, return air pipeline and sweep the pipeline all the way, can effectively sweep solenoid valve and public pipeline, avoid the interference that leads to because of the gas concentration difference of different sampling boxes, can improve measurement accuracy. The two groups of air inlet channels, the two groups of air return channels and the two air sucking pumps are arranged, when the air in one sampling box is sampled by one air sucking pump and is sent to the air analyzer for analysis, the air in the next sampling box can be pumped into the pipeline for circulation after the residual air in the electromagnetic valve and the public pipeline is purged by the other air sucking pump, and the air suction waiting time and the purging waiting time can be saved by double-pump sampling, so that the sampling efficiency and the measuring precision are greatly improved; the multi-sampling boxes are used for sampling alternately, so that the equipment utilization rate can be greatly improved, the efficient and automatic sampling detection of gas is realized, the personnel on duty is not required, and the measurement accuracy can be ensured. By arranging the switch, more communication connection interfaces can be provided for connecting the server terminal, and the use is more flexible. The air extraction waiting time and the purging waiting time can be saved, and the sampling efficiency is greatly improved. In addition, the invention is an integral case device, has simple structure and convenient expansion, and the branch air inlet channel, the branch air return channel and the corresponding electromagnetic valve are correspondingly increased when the sampling case is added.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective 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 showing the overall structure of a multi-inlet multi-outlet gas closed loop multi-point sampling control device according to embodiment 1 of the present invention;
FIG. 3 is a back view of the multiple-in multiple-out gas closed loop multi-point sampling control device of embodiment 1 of the present invention;
fig. 4 is a schematic diagram of the gas circuit connection structure of the multi-inlet multi-outlet gas closed-loop multi-point sampling control device in embodiment 1 of the present invention, which shows that the gas circuit is conducted in the first working state;
fig. 5 is a schematic diagram of the gas circuit connection structure of the multi-inlet multi-outlet gas closed-loop multi-point sampling control device in embodiment 1 of the present invention, which shows that the gas circuit is conducted in the second working state;
fig. 6 is a schematic diagram of the gas circuit connection structure of the multi-inlet multi-outlet gas closed-loop multi-point sampling control device according to embodiment 1 of the present invention, in which the gas circuit is shown to be conducted in a third working state;
fig. 7 is a schematic diagram of the gas path connection structure of the multi-inlet multi-outlet 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 the fourth operating state.
Symbol description:
1-chassis, 101-bottom plate, 102-front panel, 103-rear panel, 2-sampling air inlet, 3-sampling air return, 4-circulation air outlet, 5-circulation air inlet, 6-purge air inlet, 7-purge air outlet, 8-first aspiration pump, 9-second aspiration pump, 10-switching power supply, 11-relay module, 12-switch, 13-branch air inlet channel, 14-branch air return channel, 15-net mouth, 16-trinity switch, 17-solenoid valve group.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention will be further described in detail with reference to the drawings and detailed description below in order to make the objects, features and advantages of the invention more comprehensible.
Example 1
Referring to fig. 1 to 7, a multi-inlet multi-outlet gas closed loop multipoint sampling control device of the present invention includes a casing 1, eleven sampling gas inlets 2 for one-to-one connection with the gas outlets of eleven sampling boxes, eleven sampling gas inlets 3 for one-to-one connection with the gas return ports of eleven sampling boxes, a circulation gas outlet 4 and a circulation gas inlet 5 for one-to-one connection with the gas inlets and the gas outlets of a gas analyzer, a purge gas inlet 6 for one-to-one connection with a purge gas pipeline, a purge 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 A, B two groups of air inlet channels which are connected in parallel, each group of air inlet channels comprises twelve branch air inlet channels 13 which are respectively communicated with each sampling air inlet 2 and each purging air inlet 6, the twelve branch air inlet channels 13 are provided with public air outlets, and the public air outlets are communicated with the circulating air outlet 4 through pipelines. 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 each sampling air return port 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 inlet is communicated with the circulating air inlet 5 through a pipeline; each branch air inlet channel 13 is respectively provided with an electromagnetic valve 1-an electromagnetic valve 12 for controlling the on-off of an air channel, each branch air return channel 14 is respectively provided with an electromagnetic valve 13-an electromagnetic valve 24 for controlling the on-off of the air channel, and twelve electromagnetic valves of each group of air inlet channels and air return channels 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 A, B two groups of air inlet channels 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 groups of air inlet channels through pipelines, the air outlet ends are respectively communicated with the public air inlets of the two groups 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 further comprises control electromagnetic valves V9 and V10 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 for controlling the on-off of air paths between the circulating air inlet 5 and the common 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 and closed. 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 electromagnetic valves of all electromagnetic valve groups, the electromagnetic valves V1-V12 and the first air pump 8 and the second air pump 9 to be opened or closed, 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 provides two network ports 15, the network ports 15 being for connecting to a server for enabling communication between the server terminals and the relay module 11. The server terminal is provided with a man-machine interface for man-machine 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 each electromagnetic valve group, the control electromagnetic valves V1-V12, the first air pump 8, the second air pump 9, the relay module 11 and the switch 12.
Chassis 1 is a standard industrial chassis comprising a backplane 101, a front panel 102, and a rear panel 103. Eleven sampling air inlets 2, eleven sampling air return ports 3, a circulating air outlet 4, a circulating air inlet 5, a purging air inlet 6, a purging air outlet 7 and a net mouth 15 are all arranged on a rear panel 103 of the case 1, a three-in-one switch 16 is further arranged on the rear panel 103 of the case 1, the three-in-one switch 16 comprises a power socket and a power switch, and the power socket and the power switch are electrically connected with a 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 switch power supply 10 are all arranged in the case 1 and are arranged on the bottom plate 101 of the case 1. In this embodiment, the first air pump 8 and the second air pump 9 have smaller power and smaller volume, and can be placed in the case 1, so that the air pump is suitable for application scenes with sampling distances smaller than 150 meters. In the practical application process, the air extracting pumps with different powers can be selected according to the sampling distance.
The working principle of the multi-inlet multi-outlet gas closed loop multipoint sampling control device is as follows: the user selects a measurement mode in a man-machine interface of the server terminal, the server terminal transmits a control command to the relay module 11 through the network port 15, and the relay module 11 outputs a control signal to switch and control the solenoid valves of all solenoid valve groups, the solenoid valves V1-V12 and the first air pump 8 and the second air pump 9 to be opened or closed, so that set sampling analysis tasks are executed according to set sampling sequences.
Referring to fig. 4 to 7, in the present embodiment, the multi-in multi-out gas closed loop multi-point sampling control method includes the following steps:
step 1, referring to fig. 4, after a user starts a task in a server terminal, switching on a solenoid valve 12 of a branch air inlet channel corresponding to a purge air inlet 6 in a group a air inlet channel and a solenoid valve 13 of a branch air return channel corresponding to a purge air outlet 7 in a group C air return channel, switching on control solenoid valves V3, V9 and V12, switching on an air channel between a first air pump 8 and the group a air inlet channel, an air channel between the first air pump 8 and a circulating air outlet 4, and an air channel between a circulating air inlet 5 and the group C air return channel; and starting the first air pump 8 to enable nitrogen or zero air to enter from the blowing and sweeping air inlet 6, blowing and sweeping the electromagnetic valve group of the A group air inlet channel and the C group air return channel, the public pipeline and the measuring chamber of the gas analyzer, and discharging sweeping gas from the blowing and sweeping air outlet 7.
Step 2, referring to fig. 5, after the purging is completed, closing the solenoid valve 12 of the air intake channel of group a and the solenoid valve 13 of the air return channel of group C; according to the sampling sequence of the set sampling analysis task, opening the electromagnetic valve 11 of the corresponding branch air inlet channel in the A group air inlet channel and the electromagnetic valve 14 of the corresponding branch air return channel in the C group air return channel corresponding to the first-time sampling box; starting the gas analyzer, and starting to sample and analyze the gas of the first-time sequential sampling box.
Referring to fig. 6, while the first air pump 8 is operated, the solenoid valve 12 of the branch air intake passage corresponding to the purge air inlet in the B group air intake passage and the solenoid valve 13 of the branch air return passage corresponding to the purge air outlet in the D group air return passage are turned on, the control solenoid valves V2 and V8 between the second air pump and the second group air intake passage and between the second group air return passage are turned on, the second air pump 9 is started, and purging of the solenoid valve groups and the common pipeline of the B group air intake passage and the D group air return passage is started; referring to fig. 7, after the purge is completed, the solenoid valve 12 of the intake passage of group B and the solenoid valve 13 of the return passage of group D are closed; 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 are opened, so that the gas analyzer can sample and analyze the gas of the first order sampling box and circulate the gas of the second order sampling box in the pipeline.
Step 3, after the gas analysis of the first sequential sampling box is completed, closing the control electromagnetic valves V9 and V12, opening the control electromagnetic valves V10 and V11, closing the gas path between the first air pump 8 and the circulating gas outlet 4, and switching on the gas path between the second air pump 9 and the circulating gas outlet 4; realizing the sampling analysis of the gas of the second order sampling box; simultaneously, the first air pump 8 starts to purge the electromagnetic valve group and the common pipeline of the air inlet channel A and the air return channel C, and circulates the gas of the sampling box in the pipeline in the third order; and the process is repeated until the set sampling analysis task is completed.
Example 2
This embodiment differs from embodiment 1 in that: the first air pump 8 and the second air pump 9 adopt high-power air pumps, have larger volume and are arranged outside the case 1, and are suitable for remote sampling, such as coal mine gas detection sampling with the sampling distance exceeding 1000 meters.
Example 3
This embodiment differs from embodiment 1 in that: the multi-inlet multi-outlet gas closed-loop multi-point sampling control device comprises twenty-three sampling air inlets 2, twenty-three sampling air return ports 3, a purging air inlet 6 and a purging air 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 return air passages comprises twenty-four branch return air passages 14, and twenty-four solenoid valves are correspondingly arranged. Gas sampling analysis of twenty-three sampling boxes can be realized.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The multi-inlet multi-outlet gas closed-loop multipoint sampling control device is characterized by comprising a case, a plurality of sampling air inlets, a plurality of sampling air return openings, a circulating air outlet, a circulating air inlet, a purging air outlet, a net mouth, a three-in-one switch, a first air pump, a second air pump, a switch power supply, a relay module, a switch, a plurality of control electromagnetic valves and an electromagnetic valve group; the chassis comprises a bottom plate, a front panel and a rear panel;
the sampling air inlets, the sampling air return ports, the circulating air outlet, the circulating air inlet, the purging air outlet, the net opening and the three-in-one switch are all arranged on the rear panel; the first air pump, the second air pump, the switching power supply, the relay module, the switch, the plurality of control electromagnetic valves and the electromagnetic valve group are all arranged on the bottom plate; the sampling air inlets are connected with the air outlets of the sampling boxes in a one-to-one correspondence manner, and the sampling air return openings are connected with the air return openings of the sampling boxes in a one-to-one correspondence manner; the circulating air outlet and the circulating air inlet are respectively and correspondingly connected with an air inlet and an air outlet of the gas analyzer; the purging air inlet and the purging air outlet are correspondingly connected with a purging gas pipeline; the sampling box is a closed sampling box;
the purging air inlet and the sampling air inlets are respectively communicated with the circulating air outlet through two groups of air inlet channels, each group of air inlet channels at least comprises a plurality of branch air inlet channels respectively communicated with the sampling air inlets and the purging air inlet, the branch air inlet channels are provided with public air outlets, and the public air outlets are communicated with the circulating air outlet; the purging air outlet and the plurality of sampling air return openings 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 which are respectively communicated with the sampling air return openings and the purging air outlet, the plurality of 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 circuit; the purging air inlet is connected with a nitrogen pipeline or a zero air pipeline, and the purging air outlet is communicated with the outside of the case;
the air inlet end of the first air pump and the air inlet end of the second air pump are respectively communicated with the public air outlets of the two groups of air inlet channels through pipelines, the air outlet end of the first air pump and the air outlet end of the second air pump are respectively communicated with the public air inlets of the two groups of air return channels through pipelines, and the pipelines are respectively provided with control electromagnetic valves for controlling the on-off of an air channel; 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.
2. The multi-inlet multi-outlet gas closed-loop multi-point sampling control device according to claim 1, wherein the relay module is electrically connected with and controls the opening or closing of each electromagnetic valve, the control electromagnetic valve and the first and second air pumps;
the server terminal is in communication connection with the relay module and transmits a control instruction to the relay module; the server terminal is provided with a man-machine interface for man-machine interaction.
3. A multiple-in multiple-out gas closed loop multipoint sampling control device according to claim 2, wherein said switch is communicatively connected to said relay module and provides a plurality of communication connection interfaces for enabling communication between said server terminal and said relay module.
4. The multiple-inlet multiple-outlet gas closed loop multipoint sampling control device according to claim 1, wherein 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.
5. The multi-inlet multi-outlet gas closed-loop multipoint sampling control device according to claim 1, wherein the control electromagnetic valve is further used for controlling gas passage on-off between the gas outlet end of the first gas pump, the gas outlet end of the second gas pump and the circulating gas outlet, and gas passage on-off between the circulating gas inlet and the common gas inlets of the two groups of gas return channels;
the electromagnetic valves and the control electromagnetic valves are two-position two-way electromagnetic valves.
6. The multiple-in multiple-out gas closed loop multipoint sampling control device according to claim 1, wherein said three-in-one switch comprises a power socket and a power switch, said power socket and said power switch being electrically connected to a switching power supply.
7. A control method based on the multi-inlet multi-outlet gas closed loop multi-point sampling control device according to any one of claims 1 to 6, characterized in that the method comprises:
step 1, switching on electromagnetic valves of branch air inlet channels corresponding to a blowing air inlet in a first group of air inlet channels and electromagnetic valves of branch air return channels corresponding to a blowing air outlet in a first group of air return channels, and switching on air paths between a first air pump and the first group of air inlet channels, air paths between the first air pump and a circulating air outlet and air paths 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 air inlet, purging the electromagnetic valves of the first group of air inlet channels and the first group of air return channels, the common pipeline and the measuring chamber of the gas analyzer, and discharging the purge gas from a purge air outlet;
step 2, after the purging is finished, closing electromagnetic valves of branch air inlet channels corresponding to the purging air inlets in the first group of air inlet channels and electromagnetic valves of branch air return channels corresponding to the purging air outlets in the first group of air return channels; according to the sampling sequence of the set sampling analysis task, opening electromagnetic valves of corresponding branch air inlet channels in a first group of air inlet channels corresponding to the first-time sampling box and electromagnetic valves of corresponding branch air return channels in a first group of air return channels; starting a gas analyzer, and starting to sample and analyze the gas of the first-time sequential sampling box;
when the first air pump works, the electromagnetic valve of the branch air inlet channel corresponding to the purging air inlet in the second group of air inlet channels and the electromagnetic valve of the branch air return channel corresponding to the purging air outlet in the second group of air return channels are connected, the electromagnetic valves between the second air pump and the second group of air inlet channels and between the second group of air return channels are connected, the second air pump is started, and purging is started to be carried out on the electromagnetic valves and the public pipelines of the second group of air inlet channels and the second group of air return channels; after the purging is finished, closing the electromagnetic valve of the branch air inlet channel corresponding to the purging air inlet in the second group of air inlet channels and the electromagnetic valve of the branch air return channel corresponding to the purging air outlet in the second group of air return channels; opening electromagnetic valves of corresponding branch air inlet channels in a second group of air inlet channels corresponding to the second sequence sampling boxes and electromagnetic valves of corresponding branch air return channels in a second group of air return channels; the gas analyzer is used for realizing the sampling analysis of the first-order sampling box gas and circulating the second-order sampling box gas in the pipeline;
step 3, closing a gas path between the first air pump and the circulating air outlet and connecting the gas path between the second air pump and the circulating air outlet after the gas analysis of the first sequential sampling box is completed; realizing the sampling analysis of the gas of the second order sampling box; simultaneously, the first air pump starts to purge the electromagnetic valves and the common pipelines of the first group of air inlet channels and the first group of air return channels, and circulates the gas of the third-order sampling box in the pipelines; and the process is repeated until the set sampling analysis task is completed.
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