CN-122016417-A - Portable construction site environment monitoring device

CN122016417ACN 122016417 ACN122016417 ACN 122016417ACN-122016417-A

Abstract

The invention relates to the technical field of environment monitoring instruments, and provides a portable construction site environment monitoring device which comprises a sampling machine body, a first filtering branch, a second filtering branch and a three-way ball valve, wherein the sampling machine body is used for collecting gas for sampling analysis, the first filtering branch is fixedly connected and communicated with the sampling machine body, the second filtering branch is connected in parallel with the first filtering branch and is fixedly connected and communicated with the sampling machine body, the three-way ball valve is fixedly connected and communicated with the sampling machine body, the first filtering branch and the second filtering branch are respectively provided with a filter membrane for filtering air, gas flow sensors are respectively arranged at the filter membranes, the gas flow sensors are connected with a control center for controlling the three-way ball valve, and the first filtering branch and the second filtering branch are respectively provided with a micro-positive pressure protection device for protecting the filter membranes. The invention has the beneficial effects that when the filter membrane is used in an environment with high humidity and high dust, the filter membrane is not replaced in the sampling process, and the continuity of data and time sequences is ensured.

Inventors

MA LIPENG
YAO MINGYI
WANG CAN
LIU LIMING
YANG TAO
TONG JINCAI
ZUO TONG
CHEN YU
WANG BO
RUAN JUNHUI

Assignees

中建八局天津建设工程有限公司
天津大学福州国际联合学院(天津大学福州国际研究院)

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. The utility model provides a portable job site environment monitoring device, a serial communication port, including sampling organism (1) that is used for collecting gas and carries out sampling analysis, with sampling organism (1) fixed connection and the first filtration branch road (2) of intercommunication, with first filtration branch road (2) parallelly connected and with sampling organism (1) fixed connection and the second filtration branch road (3) of intercommunication filter branch road (3) and with sampling organism (1), first filtration branch road (2) and the equal fixed connection and the tee bend ball valve (4) of intercommunication of second filtration branch road (3), all be provided with in first filtration branch road (2) and the second filtration branch road (3) and be used for carrying out filterable filter membrane to the air, filter membrane department all is provided with gas flow sensor, gas flow sensor is connected with the control center that is used for controlling tee bend ball valve (4), first filtration branch road (2) and second filtration branch road (3) are through tee bend ball valve (4) intercommunication respectively with sampling organism (1), first filtration branch road (2) and second filtration branch road (3) all are provided with micro positive pressure protection device (6) that are used for carrying out the protection to the filter membrane.
2.A portable construction site environment monitoring device according to claim 1, characterized in that the micro positive pressure protection device (6) comprises a gas source (61) for providing a shielding gas, a delivery pipe (62) for delivering the shielding gas, a flow limiting capillary (63) for controlling the gas flow rate, and a delivery branch (64) for connecting the first filtering branch (2) and the second filtering branch (3), respectively, both delivery branches (64) being fixedly connected and communicating with the flow limiting capillary (63).
3. The portable construction site environment monitoring device according to claim 2, wherein micro-pressure difference sensors (7) used for monitoring the first filtering branch (2) or the second filtering branch (3) are arranged in the first filtering branch (2) and the second filtering branch (3), each conveying branch (64) is provided with a proportional regulating electromagnetic valve (8), and the micro-pressure difference sensors (7) are connected with a control center used for controlling the proportional regulating electromagnetic valves (8).
4. A portable construction site environment monitoring device according to claim 3, characterized in that on both said delivery branch pipes (64) are provided with on-off solenoid valves (9), the on-off solenoid valves (9) being connected to a control center.
5. The portable construction site environment monitoring device according to claim 2, wherein the first filtering branch (2) and the second filtering branch (3) are respectively provided with a control valve (10) for closing and opening the first filtering branch (2) or the second filtering branch (3) at one end far away from the sampling machine body (1).
6. A portable construction site environment monitoring device according to claim 2, wherein the flow restricting capillary tube (63) has an inner diameter of 0.1-0.2mm.
7. The portable construction site environment monitoring device according to claim 1, wherein the first filtering branch (2) and the second filtering branch (3) are respectively provided with a filter membrane holder (5) for holding a filter membrane, and a mounting structure (20) for detachable filter membrane holders (5) is respectively arranged between the filter membrane holders (5) and the first filtering branch (2) and the second filtering branch (3).
8. The portable construction site environment monitoring device according to claim 7, wherein the mounting structure (20) comprises a mounting bar (201) fixedly connected with the inner wall of the first filtering branch (2) or the inner wall of the second filtering branch (3), a mounting groove (202) formed on the mounting bar (201) and a mounting block (203) fixedly connected with the filter membrane holder (5), and the mounting block (203) is in plug-in fit with the mounting groove (202).
9. The portable construction site environment monitoring device according to claim 8, wherein the side walls of the first filtering branch (2) and the second filtering branch (3) are provided with material taking openings, the material taking openings are provided with opening and closing plates (30), and sealing devices (40) for sealing gaps between the material taking openings and the opening and closing plates (30) are arranged between the opening and closing plates (30) and the first filtering branch (2) or the second filtering branch (3).
10. The portable construction site environment monitoring device according to claim 9, wherein the sealing device (40) comprises a connecting block (401) fixedly connected with the first filtering branch (2) or the second filtering branch (3), a clamping groove (402) formed in the connecting block (401) and a clamping strip (403) fixedly connected with the opening and closing plate (30), and the clamping strip (403) is in clamping fit with the clamping groove (402).

Description

Portable construction site environment monitoring device Technical Field The invention relates to the technical field of environment monitoring instruments, in particular to a portable construction site environment monitoring device. Background In the VOC monitoring of ambient air, industrial waste gas, and construction sites, in order to obtain accurate quantitative analysis results, it is generally necessary to perform long-time cumulative sampling using equipment such as an adsorption tube or a sigma tank. During sampling, the filter membrane must be used to remove particulates from the air before the gas enters the adsorption media to prevent the particulates from contaminating and damaging the delicate adsorbent or analytical instrument. However, in environments with high dust concentration and high humidity, such as construction sites, wet dust is generated by the combination of moisture and dust, and the wet dust can paste pores on the surface of the filter membrane more quickly, so that the sampling flow rate drops sharply in a time far below the expected time, the sampling volume is inaccurate, and even sampling failure is caused by rupture of the filter membrane when the sampling volume is severe. In order to solve the problem, an operator must stop the machine in time to replace the filter membrane, which not only interrupts the sampling process, causes data loss and time series discontinuity, but also causes pollution or gas leakage due to improper operation during the replacement process, which affects the representativeness and accuracy of the sampling result, so that a new technical scheme is required to solve the technical problem. Disclosure of Invention When the portable construction site environment monitoring device is used in a high-humidity high-dust environment, when the air flow sensor at the filter membrane is used for monitoring that the air flow weakens to a certain value, the detector transmits a signal to the control center to control the three-way electric ball valve to close the first filter branch, and simultaneously opens the second filter branch, so that the second filter branch continuously conveys filtered air to the sampling machine body, an operator can replace the filter membrane in the first filter branch at the moment, after the filter membrane is replaced, the micro positive pressure protection device continuously introduces clean air flow into the first filter branch, the pollution of the external air flow to the filter membrane in the first filter branch when the filter membrane is not sampled is avoided, the purpose of replacing the filter membrane without interrupting the sampling process is achieved, and the continuity of data and time sequences is ensured. The application provides a portable construction site environment monitoring device which comprises a sampling machine body, a first filtering branch, a second filtering branch and a three-way electric ball valve, wherein the sampling machine body is used for collecting gas for sampling analysis, the first filtering branch is fixedly connected and communicated with the sampling machine body, the second filtering branch is connected with the first filtering branch in parallel and is fixedly connected and communicated with the sampling machine body, the three-way electric ball valve is fixedly connected and communicated with the sampling machine body, filter membranes used for filtering air are arranged in the first filtering branch and the second filtering branch, gas flow sensors are arranged at the filter membranes, the gas flow sensors are connected with control centers used for controlling the three-way electric ball valve, the first filtering branch and the second filtering branch are respectively communicated with the sampling machine body through the three-way electric ball valve, and the first filtering branch and the second filtering branch are respectively provided with micro-positive pressure protection devices used for protecting the filter membranes. When the monitoring device is used in an environment with high humidity and high dust, firstly, the first filtering branch is utilized to convey air flow into the sampling machine body, the filter membrane in the first filtering branch is utilized to filter and collect suspended particles in the air, when the air flow sensor at the filter membrane detects that the air flow weakens to a certain value, the detector transmits signals to the control center to control the three-way electric ball valve to close the first filtering branch, and meanwhile, the second filtering branch is opened, so that the second filtering branch continuously conveys filtered air to the sampling machine body, an operator can replace the filter membrane in the first filtering branch at the moment, after the filter membrane is replaced, the micro-positive pressure protection device continuously introduces clean air flow into the first filtering branch, the filter membrane in th