An expandable long-distance multi-channel gas sampling device

Abstract

The invention provides an expandable long-distance multi-channel gas sampling device, comprising: a direct-acting solenoid valve group, a vacuum pump, a quick-change connector, a pressure sensor, a multi-channel I / O signal isolation amplifier, a terminal module, a power module, a main control board, an inert material hose, a hand valve, a check valve, and a chassis. The device is provided with 6-channel sampling air inlets, and the sampling air inlets are respectively connected to two direct-acting solenoid valve groups through three-way conversion connectors. The two direct-acting solenoid valve groups are respectively connected to two vacuum pumps, one of the two valve groups is used for sampling and the other is used for waiting for sampling, which can effectively reduce the purging waiting time of the next gas; the main control board is used to control the on-off of the solenoid valve gas path, so as to realize the switching of multiple gas paths in a predetermined order, thereby achieving the purpose of flexible multi-channel gas sampling, and the farthest long-distance sampling of 1 km can be realized; the device is provided with a gas path expansion interface, and the expansion device can be connected according to actual needs to expand the number of sampling gas paths; the device is also provided with an external communication interface, and the gas path state can be monitored in real time and the on-off of the gas path can be controlled through relevant communication means, and the sampling sequence of each path, the sampling time and other parameters can be set.

Description

Technical Field

[0001] The invention relates to the field of gas sampling, and in particular to an expandable long-distance multi-channel gas sampling device. Background Art

[0002] At present, when monitoring environmental quality, most of the existing multi-channel sampling devices only sample the gas near the instrument and cannot monitor the gas at a long distance. Therefore, the sampling equipment needs to be moved to the sampling point, which makes the monitoring efficiency low. In addition, some instruments and equipment are very expensive, large in size and weight, and it is particularly labor-intensive and resource-intensive to move them. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides an expandable long-distance multi-channel gas sampling device, which can remotely monitor the environmental quality within a radius of 1km around it, greatly reducing manpower and material resources compared to existing multi-channel gas monitoring methods; and through relevant communication means, the sampling gas path can be remotely switched in real time; by connecting to online monitoring equipment, online monitoring can be achieved, and the environmental quality can be tracked in real time. At the same time, the construction cost is greatly reduced compared to the automatic monitoring method.

[0004] The patented technical solution of the present invention is implemented as follows:

[0005] The invention provides an expandable long-distance multi-channel gas sampling device, including a direct-acting solenoid valve group, a vacuum pump, a multi-channel I / O signal isolation amplifier, a terminal block module, a quick-change connector, a pressure sensor, a power module, a main control board, an inert material hose, a hand valve, a check valve, an RS485 interface, an RJ45 interface, a signal indicator light, a power indicator light, and a power switch; the normally open port of the direct-acting solenoid valve is connected to the air inlet of the vacuum pump through an inert material hose to form a gas path to be sampled, and the normally closed port of another group of direct-acting solenoid valves is connected to the air inlet of the vacuum pump through an inert material hose to form a sampling gas path; the gas outlet of the gas path to be sampled is connected to the exhaust port of the box body for exhausting the gas to be sampled; the terminal box body sampling port of the sampling gas path is connected to the sampling instrument; the gas path to be sampled and the sampling gas path are connected to the sampling port of the box body through a three-way quick-change connector, and the sampling air inlet of the box body is connected to the external long-distance sampling gas path;

[0006] The preferred technical solution of the present invention is that the expandable long-distance multi-channel gas sampling device is characterized in that: the main control board includes an MCU, the MCU is provided with a WiFi function on the periphery, and a network port communication module is provided on the periphery for communicating with a host computer, the MCU is provided with a Bluetooth function on the periphery for completing local parameter configuration through a mobile phone APP, the MCU is connected to an RS485 communication unit for communicating with a gas path expansion device to achieve synchronous control of the gas path expansion device, the MCU is also connected to a multi-channel I / O interface, an air pump control interface, and an A / D sampling circuit, the multi-channel I / O interface is used to connect a multi-channel I / O signal isolation amplifier (5) for controlling a direct-acting solenoid valve (1, 2), the air pump control interface is connected to a vacuum pump (3, 4) for controlling the speed of the vacuum pump, and the A / D sampling circuit is used to convert an analog signal of a pressure sensor (8) into a digital signal.

[0007] The preferred technical solution of the patent of the present invention is that the multi-channel gas sampling device also includes an RS485 interface and an RJ45 interface for communicating with a host computer, a radio frequency antenna for wireless communication, and a power interface for connecting to an external AC power supply.

[0008] The preferred technical solution of the patent of the present invention is that the RS485 interface is a five-core aviation socket, and the power interface is a standard PIN interface with a power switch.

[0009] The preferred technical solution of the patent of the present invention is that the device is provided with a power indicator light and a signal indicator light.

[0010] The preferred technical solution of the patent of the present invention is that the power module is used to convert the mains power into 24 DC voltage.

[0011] The preferred technical solution of the patent of the present invention is that, when sampling, the solenoid valve (P1-1) of a gas path (set as P1) that needs to be sampled in the sampling gas path is opened. At this time, the P1 sampling gas path is opened, and the solenoid valve (P1-2) in the gas path to be sampled of the corresponding gas path (P1) is also opened. At this time, the P1 gas path to be sampled is closed, and then all vacuum pumps are turned on for sampling.

[0012] The preferred technical solution of the present invention is that a pressure sensor (8) is connected between the vacuum pump (3) and the sampling port (16) to detect the pipeline pressure before entering the sampling instrument. The main control board (10) controls the vacuum pump (3) according to the received pressure data, and then adjusts the pipeline pressure to meet the sampling instrument's requirements for intake pressure.

[0013] The preferred technical solution of the patent of the present invention is that a hand valve is connected between the normally open port of the direct-acting solenoid valve and the air inlet of the vacuum pump via a three-way quick-change joint, leading to an extended port to be sampled, which is used to expand the sampling point; another group of directly-acting solenoid valves are connected between the normally closed port and the air inlet of the vacuum pump via a three-way quick-change joint, and a hand valve is connected between the normally closed port and the air inlet of the vacuum pump, leading to an extended sampling port, which is used to expand the sampling point.

[0014] The preferred technical solution of the patent of the present invention is that a pressure sensor is connected between the air outlet of the vacuum pump of the sampling air circuit and the sampling port of the box to monitor the air pressure in the sampling air circuit.

[0015] The preferred technical solution of the patent of the present invention is that a check valve is connected between the air outlet of the vacuum pump of the sampling gas circuit and the pressure sensor through a three-way quick-change connector, and the check valve is connected to the sampling exhaust port of the box body, which is used for sampling exhaust in the initial startup stage to exhaust the non-monitoring gas originally in the sampling gas circuit and prevent the sampling instrument from extracting nearby gas when taking samples.

[0016] The preferred technical solution of the patent of the present invention is that when switching the sampling gas circuit, the solenoid valves (P3-1, P3-2) of the next sampling gas circuit in the sampling gas circuit and the gas circuit to be sampled are opened at the same time. At this time, the sampling gas circuit of P3 is opened, and the gas circuit to be sampled is closed, and then the solenoid valves (P-1, P-2) of the previous sampling gas circuit (P1) are closed at the same time, thereby closing the sampling gas circuit of P1 and opening the gas circuit to be sampled of P1, thereby realizing gas circuit switching.

[0017] The preferred technical solution of the patent of the present invention is that the hand valve connected to the sampling extension port and the extension port to be sampled is in a normally closed state. When the gas circuit needs to be expanded, the hand valve can be manually opened to expand the gas circuit.

[0018] The technical effects of this patent are as follows: simple structure, easy to use, able to set the gas sampling sequence for rotation sampling according to demand, and able to expand the gas circuit according to demand. At the same time, it can remotely monitor the status of each gas circuit in real time and regulate the on and off of each gas circuit without the need for on-site operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of this patent;

[0020] Figure 2 This is a schematic diagram of the external interface of the box of this patent;

[0021] Figure 3 It is the gas path schematic diagram of this patent;

[0022] Figure 4 It is the main control schematic diagram of this patent.

[0023] The numbers in the figure are: 1, 2-direct-acting solenoid valve group, 3, 4-vacuum pump, 5-multi-channel I / O signal isolation amplifier, 6-terminal module, 7-quick-change connector, 8-pressure sensor, 9-power module, 10-main control board, 11 inert material hose, 12-hand valve, 13-check valve, 14-chassis, 15-sampling exhaust port, 16-sampling port, 17-exhaust port to be sampled, 18-extension port to be sampled, 19-sampling extension port, 20-RS485 interface, 21-RJ45 interface, 22-signal indicator light, 23-power indicator light, 24-power switch; the following table shows the relevant parameters of the components.

[0024] DETAILED DESCRIPTION

[0025] The controller main control board controls the direct-acting solenoid valve group through a multi-channel I / O signal isolation amplifier to switch the gas collection and exhaust of different air inlets.

[0026] The main control board can realize local parameter setting and remote parameter setting, and can realize uninterrupted operation or periodic operation according to the user's settings. The user can customize the sampling order and sampling time of the sampling location, and the main control board will realize sequential collection according to the user's settings.

[0027] The main control board provides a Bluetooth configuration interface, and users can configure the basic information of the main control board through the APP.

[0028] During the sampling process, the main control board controls the air pressure at the sampling port by controlling the vacuum speed, and reads the value of the pressure sensor for feedback adjustment to keep the air pressure at the sampling port within the range required by the sampling instrument.

[0029] The main control board and the host computer can establish a socket connection through WiFi or network port. The host computer can remotely modify the parameters of the main control board and control the operation of the main control board. The main control board uploads the sampling status of the gas path in real time to achieve synchronization with the host computer.

[0030] The main control board comes with 6 sampling ports. If the number of sampling ports is insufficient, multiple gas path expansion devices can be cascaded at the expansion ports to achieve sampling of more gas paths. The communication method between the main control board and the gas path expansion device adopts the RS485 communication method, and the communication protocol adopts the Modbus-RTU protocol. The operation of multiple gas path expansion devices is uniformly controlled by the main control board.

Claims

1. An expandable long-distance multi-channel gas sampling device, characterized in that: include: Direct-acting solenoid valve group (1, 2), vacuum pump (3, 4), multi-channel I / O signal isolation amplifier (5), terminal block module (6), quick-change connector (7), pressure sensor (8), power module (9), main control board (10), inert material hose (11), hand valve (12), check valve (13), chassis (14), sampling port (16), RS485 interface (20), RJ45 interface (21), signal indicator light (22), power indicator light (23), power switch (24); The normally open position of the direct-acting electromagnetic valve group (1) is connected to the air inlet of the vacuum pump (3) via a hose, serving as a gas path to be sampled; The air outlet of the vacuum pump (3) is directly connected to the exhaust port (17) of the box to be sampled; The normal opening of the direct-acting electromagnetic valve group (1) and the air inlet of the vacuum pump (3) are connected to the hand valve (12) through a three-way quick-change joint to lead to an expansion port (18) to be sampled; The normally closed port of the direct-acting electromagnetic valve group (2) is connected to the air inlet of the vacuum pump (4) via a hose to serve as a sampling air path; The normal opening of the direct-acting electromagnetic valve group (2) and the air inlet of the vacuum pump (4) are connected to the hand valve (12) through a three-way quick-change joint to lead out the sampling expansion port (19); The air outlet of the vacuum pump (4) is connected to the pressure sensor (8) via the inert material hose (11); The three-way quick-change joint between the air outlet of the vacuum pump (4) and the pressure sensor (8) is connected to the check valve (13) as a rear direct-connected sampling exhaust port (15); The sampling port (16) is connected to a sampling instrument via the inert material hose (11); The sampling port (16) is respectively connected to the direct-acting solenoid valve group (1) and the direct-acting solenoid valve group (2) via a three-way quick-change joint, thereby dividing the gas circuit into a sampling gas circuit and a gas circuit to be sampled.

2. The expandable long-distance multi-channel gas sampling device according to claim 1, characterized in that: The wiring terminal module (6) is connected to the power supply module (9) via wires to extract the power supply voltage; The vacuum pumps (3, 4), the multi-channel I / O signal isolation amplifier (5), the pressure sensor (8), and the main control board (10) are all connected to the wiring terminal module (6) via wires to supply power to each module; The control signal of the direct-acting solenoid valve group (1, 2) is connected to the wire of the multi-channel I / O signal isolation amplifier (5) for signal transmission; The multi-channel I / O signal isolation amplifier (5) is connected to the main control board (10) via wires to control the solenoid valve to achieve multi-channel control of the gas circuit; The pressure sensor (8) is connected to the main control board (10) via a wire to read pressure data in the gas circuit.

3. The expandable long-distance multi-channel gas sampling device according to claim 1, characterized in that: The main control board comprises an MCU, the MCU is provided with a WiFi function on the periphery, and a network port communication module is provided on the periphery for communicating with a host computer, the MCU is provided with a Bluetooth function on the periphery for completing local parameter configuration via a mobile phone APP, the MCU is connected to an RS485 communication unit for communicating with a gas path expansion device to achieve synchronous control of the gas path expansion device, the MCU is also connected to a multi-channel I / O interface, an air pump control interface, and an A / D sampling circuit, the multi-channel I / O interface is used to connect a multi-channel I / O signal isolation amplifier (5) for controlling a direct-acting solenoid valve (1, 2), the air pump control interface is connected to a vacuum pump (3, 4) for controlling the speed of the vacuum pump, and the A / D sampling circuit is used to convert an analog signal of a pressure sensor (8) into a digital signal.

4. The expandable long-distance multi-channel gas sampling device according to claim 2, characterized in that: The multi-channel gas sampling device also includes an RS485 interface and an RJ45 interface for communicating with a host computer, a radio frequency antenna for wireless communication, and a power interface for connecting to an external mains power supply.

5. The expandable long-distance multi-channel gas sampling device according to claim 4, characterized in that: The RS485 interface is a five-core aviation socket, and the power interface is a standard PIN interface with a power switch.

6. The expandable long-distance multi-channel gas sampling device according to claim 4, characterized in that: The device is provided with a power indicator light and a signal indicator light.

7. The expandable long-distance multi-channel gas sampling device according to claim 4, characterized in that: The power module is used to convert the mains power into 24V DC voltage.

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