An expandable long-distance multi-channel gas sampling expansion device

Abstract

The present invention provides an expandable long-distance multi-channel gas sampling expansion device, comprising: a direct-acting solenoid valve group, a quick-change connector, a multi-channel I / O signal isolation amplifier, a terminal module, a power module, a main control board, an inert material hose, and a chassis. The device is provided with 6 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 directly connected to the sampling air inlet and the air inlet to be sampled, respectively. One of the two valve groups is used for sampling, and the other is used for sampling, which can effectively reduce the purging waiting time of the next gas. The solenoid valve is controlled to be on and off the gas circuit through the main control board, so as to realize disordered switching of multiple gas circuits, and then achieve the purpose of multi-channel gas sampling, and long-distance sampling of up to 1 km can be realized; the device is provided with a gas circuit expansion interface, and the expansion device can be connected to expand the sampling gas circuit according to actual needs; the device is also provided with an external communication interface, which can monitor the gas circuit status in real time and control the gas circuit on and off through relevant communication means; the device is used in conjunction with an expandable long-distance multi-channel gas sampling device (hereinafter referred to as the main control device), which can expand the number of sampling gas circuits and improve the utilization rate of analytical instruments.

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 expansion device. Background Art

[0002] The multi-channel sampling currently involved in the field of atmospheric sampling mostly analyzes existing samples, and is unable to perform sampling at longer distances; and the existing multi-channel analysis devices currently have no expansion devices and can only perform analysis and testing based on the number of channels of the existing devices, and the efficiency needs to be further improved. Summary of the invention

[0003] The present invention provides an expandable long-distance multi-channel gas sampling extension device, which can expand 6 sampling points. Multiple extension devices can be superimposed as needed to achieve the required number of sampling points; 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 environmental quality can be tracked in real time.

[0004] The present invention provides an expandable long-distance multi-channel gas sampling extension device, comprising a first direct-acting solenoid valve group, a second direct-acting solenoid valve group, a multi-channel I / O signal isolation amplifier, a terminal block module, a three-way quick-change connector, a power module, a main control board, an inert material hose, a chassis, an RS485 interface, an RJ45 interface, a power indicator light, a signal indicator light, and a sampling air inlet; the first direct-acting solenoid valve is normally open and connected to a sampling extension port of a box through an inert material hose to form a gas path to be sampled; the second direct-acting solenoid valve is normally closed and connected to the sampling extension port of the box through an inert material hose to form a sampling gas path; the gas path to be sampled and the sampling gas path are connected to the sampling port of the box through a three-way quick-change connector, and the sampling port of the box is connected to an external long-distance sampling gas path.

[0005] The preferred technical solution of the present invention is that the main control board includes an MCU, and the MCU has a built-in Bluetooth function for completing local parameter configuration through a mobile phone APP. The MCU is connected to an RS485 communication unit for communicating with a gas circuit master control device to achieve synchronous control of a gas circuit expansion device. The MCU is also connected to a multi-channel I / O interface, and the multi-channel I / O interface is used to connect a multi-channel I / O signal isolation amplifier for controlling a direct-acting solenoid valve.

[0006] The preferred technical solution of the present invention is that the expansion device also includes an RS485 interface and an RJ45 interface for communicating with the main control device.

[0007] The preferred technical solution of the present invention is that the RS485 interface is a five-core aviation socket.

[0008] A preferred technical solution of the present invention is that the expansion device has a power indicator light and a signal indicator light.

[0009] A preferred technical solution of the present invention is that the power module is used to convert the mains power into a 24V DC voltage.

[0010] The preferred technical solution of the present invention is that the expansion device cannot be used alone, but needs to be used in conjunction with the main control device as its expansion component.

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

[0012] The technical effects of the present invention are as follows: simple structure, easy to use, and can be used in conjunction with a main control device to increase the number of sampling gas circuits as needed. By communicating with the main control device, the status of each gas circuit can be remotely monitored in real time, and the on-off sequence of each gas circuit can be adjusted and set without the need for on-site operation by personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0014] Figure 2 It is a gas path schematic diagram of the present invention;

[0015] Figure 3 It is a main control schematic diagram of the present invention.

[0016] The numbers in the figure are: 1-chassis, 2, 3-direct-acting solenoid valve group, 4-multi-channel I / O signal isolation amplifier, 5-terminal module, 6-main control board quick-change connector, 7-power module, 8-inert material hose, 9-sampling expansion port, 10-expansion port to be sampled, 11-quick-change connector, 12-RS485 interface, 13-RJ45 interface, 14-power indicator light, 15-signal indicator light, 16-sampling air inlet; the following table shows the relevant parameters of the components.

[0017]

[0018] DETAILED DESCRIPTION

[0019] The main control board of the expansion device establishes communication with the main control device through the RS485 interface. After receiving the command, the main control board of the expansion device controls the direct-acting solenoid valve group through the multi-channel I / O signal isolation amplifier to switch the gas collection and exhaust of different air inlets.

[0020] The expansion device main control board provides a Bluetooth configuration interface, and users can configure the basic information of the main control board through the APP.

[0021] The expansion device comes with 6 sampling ports. If the number of sampling ports is insufficient, the next-level expansion device can be cascaded. The communication method adopts RS485 communication method, and the communication protocol uniformly adopts Modbus-RTU protocol. The operation of multiple gas path expansion devices is uniformly controlled by the main control board of the main control device.

Claims

1. An expandable long-distance multi-channel gas sampling expansion device, characterized in that: include: A first direct-acting solenoid valve group (2), a second direct-acting solenoid valve group (3), a multi-channel I / O signal isolation amplifier (4), a terminal block module (5), a three-way quick-change connector (11), a power module (7), a main control board (6), an inert material hose (8), a chassis (1); an RS485 interface (12), an RJ45 interface (13), a power indicator light (14), a signal indicator light (15), and a sampling air inlet (16); the sampling air inlet (16) is connected to the three-way quick-change connector (11); the three-way quick-change connector (11) is respectively connected to the first direct-acting solenoid valve group (2) and the second direct-acting solenoid valve group (3), dividing the gas path into a sampling gas path and a gas path to be sampled; the normally closed port of the first direct-acting solenoid valve group (2) is directly connected to the sampling extension port (9) as a sampling gas path; the normally open port of the second direct-acting solenoid valve group (3) is directly connected to the extension port to be sampled (10) as a gas path to be sampled.

2. The expandable long-distance multi-channel gas sampling expansion device according to claim 1, characterized in that: The wiring terminal module (5) is connected to the power module (7) by wires to extract the power supply voltage; the multi-channel I / O signal isolation amplifier (4) and the main control board (6) are both connected to the wiring terminal module (5) by wires to supply power to each module; the control signals of the first direct-acting solenoid valve group (2) and the second direct-acting solenoid valve group (3) are connected to the multi-channel I / O signal isolation amplifier (4) by wires to transmit signals; the multi-channel I / O signal isolation amplifier (4) is connected to the main control board (6) by wires to control the solenoid valves to achieve multi-channel control of the gas circuit.

3. The expandable long-distance multi-channel gas sampling expansion device according to claim 1, characterized in that: The main control board comprises an MCU, wherein the MCU has a built-in Bluetooth function for completing local parameter configuration via a mobile phone APP, the MCU is connected to an RS485 communication unit for communicating with a gas circuit master control device to achieve synchronous control of a gas circuit expansion device, and the MCU is also connected to a multi-channel I / O interface, wherein the multi-channel I / O interface is used to connect a multi-channel I / O signal isolation amplifier (4) for controlling the first direct-acting solenoid valve group (2) and the second direct-acting solenoid valve group (3).

4. The expandable long-distance multi-channel gas sampling expansion device according to claim 2, characterized in that: The expansion device also includes an RS485 interface (12) and an RJ45 interface (13) for communicating with the main control device.

5. The expandable long-distance multi-channel gas sampling expansion device according to claim 4, characterized in that: The RS485 interface (12) is a five-core aviation socket.

6. The expandable long-distance multi-channel gas sampling expansion device according to claim 4, characterized in that: The expansion device is provided with a power indicator light (14) and a signal indicator light (15).

7. The expandable long-distance multi-channel gas sampling expansion device according to claim 4, characterized in that: The power supply module (7) is used to convert the mains electricity into a 24V direct current voltage.

8. An expandable long-distance multi-channel gas sampling expansion device according to any one of claims 1 to 7, characterized in that: The expansion device cannot be used alone and must be used in conjunction with the main control device as an expansion component.

Images