【Introduction of the new patent】A device and method for detecting water quality in a pipe network

Today, I will introduce a national invention authorized patent-a water quality testing device and method for pipe network. The patent was applied for by Ningbo Water Meter Co., Ltd., and the authorization was announced on March 30, 2018.

The present invention relates to the field of water quality detection, in particular to a pipe network water quality detection device and method.

The safety of drinking water concerns millions of households, and it is urgent to ensure the safety of drinking water. The laying of pipes in urban water supply networks is long and complicated. Drinking water needs to be transported over long distances and long periods to reach users. Due to various physical, chemical, and microbiological effects during the transport process, drinking water is easily contaminated and water quality deteriorates. . Therefore, it is very necessary to conduct real-time online detection of water quality on key pipe networks.

The equipment for online water quality monitoring in the prior art usually samples the water in the pipe network, and the taken water samples are tested using external testing equipment. This kind of detection device cannot be directly installed on the pipeline, it requires an independent installation space, and the sampling process is relatively complicated, which increases the detection cost.

There is also an in-line water quality detection device on the market, which can be directly inserted into the pipeline to detect water quality, but this detection method is limited by the water flow rate, and the accuracy is not high.

In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a pipe network water quality detection device, which is suitable for directly connecting to the pipeline to detect the water quality in the pipeline. The second object of the present invention is to provide a method for detecting water quality in a pipe network, which separates small low-velocity tributaries on the main water stream, and obtains the water quality of the main water stream by detecting the water quality in the tributaries.

One of the objectives of the present invention is achieved by adopting the following technical solutions: a pipeline network water quality detection device, including a main pipeline, a detection tube, and a water quality detection module. The water quality detection module includes at least one sensor for detecting water quality, and each sensor is arranged in the detection tube. The detection pipe has a water inlet and a water outlet. The water inlet and the water outlet are respectively connected with the main pipe, and both ends of the main pipe are adapted to communicate with the pipe network so that the water in the pipe network enters the main pipe and the detection pipe. When the water in the pipe network flows through the main pipe, a part of the water enters the detection pipe through the water inlet. The sensor detects the water quality of the water entering the detection pipe, and then the water flows through the water outlet and then enters the main pipe. The water flow in the detection pipe is more stable than the water flow in the pipe network, which makes the water quality detection of the present invention more accurate. In addition, because the detection of the present invention is basically completed in a confined space, the detection process will not bring pollutants into the water stream, so the water after the detection can enter the main pipeline again, which not only avoids the waste of water resources, but also At the same time, the processing steps of the water sample after the detection are omitted, so that the structure of the detection device is simplified.

The main pipeline of the present invention can be directly connected to the pipeline in the pipeline network, which is beneficial to reduce the space occupied by the detection equipment as a whole. Moreover, because the pipe network water quality detection device of the present invention is convenient to install, it can be installed in various places of the pipe network as required, which enhances the monitoring of the water quality of the pipe network. The main pipeline includes a water inlet section and a water outlet section. The inner diameter of the water inlet section is larger than the inner diameter of the water outlet section. The water inlet of the detection tube is connected with the water inlet section, and the water outlet of the detection tube is connected with the water outlet section. The nozzle produces a water pressure difference. Due to the water pressure difference between the water inlet and the water outlet, the water flow in the main pipeline is easier to enter the detection tube under the action of water pressure, so that the water in the detection tube is constantly updated, that is, the water quality detection module always detects the pipe network The latest water quality data in.

The main pipeline also includes a first transition pipe section located between the water inlet section and the water outlet section and a second transition pipe section downstream of the water outlet section. The inner diameter of the first transition pipe section gradually decreases from upstream to downstream, and the inner diameter of the second transition pipe section decreases from upstream to downstream. From upstream to downstream, it gradually becomes larger. By adding the first transition pipe section and the second transition pipe section on both sides of the water outlet section, the inner diameter of the main pipe changes slowly, avoiding the unstable water flow caused by rapid changes. The length of the first transition pipe section is smaller than the length of the second transition pipe section. In this way, the water body downstream of the outlet section can reduce the formation of vortices.

The water inlet and the water inlet section are connected through a first branch pipe, and the water outlet and the water outlet section are communicated through a second branch pipe. The first branch pipe and the second branch pipe are respectively provided with valves. By setting the valve, the main pipeline and the detection pipe can be connected according to the needs of users, which improves the flexibility of use of the pipeline network water quality detection device. The water quality detection module includes a temperature sensor, a residual chlorine sensor, a pH sensor, a conductivity sensor, and a turbidity sensor; the residual chlorine sensor, a pH sensor, and a conductivity sensor are arranged in the middle of the detection tube. The pipe network water quality detection device of the present invention integrates multiple detection sensors, can detect multiple water quality parameters, and meets the detection requirements for various water quality. Its integration is high, the overall volume is small, and it is easy to install. In addition, since the detection of water quality can be realized by using existing sensors, the cost of the water quality detection device of the pipe network is greatly reduced, which is beneficial to large-scale promotion. The water quality detection module also includes an automatic exhaust valve. The automatic exhaust valve is arranged at the upper part of the detection tube near the outlet to collect and discharge the gas in the detection tube. The turbidity sensor is arranged downstream of the automatic exhaust valve. By adding an automatic exhaust valve, the measurement accuracy of the turbidity sensor can be improved.

The pipe network water quality detection device also includes a control module, a communication module, a display module, a control panel, and a power supply; the control module is connected to each sensor signal for processing sensor information; the water quality data obtained by the control module is transmitted to the control center through the communication module; The display module is connected with the control module signal to display water quality information; the control module is connected with the control panel signal to set the parameters of the control module through the control panel; the control panel is also connected with the display module signal, the display module provides display for the control panel; The power supply is used to supply power to the control module, communication module, display module and control panel.

The second objective of the present invention is achieved by adopting the following technical solution: a method for detecting water quality in a pipe network, including the following steps: making the main water flow in the pipe network form at least one branch at at least one pipe section; after the branch flows through at least one water quality detection sensor, It merges into the main stream again. Make the inner diameter of the main stream at the inlet of the branch larger than the inner diameter of the main stream at the outlet of the branch, so that the water pressure upstream of the branch is greater than the water pressure downstream.

Compared with the prior art, the present invention has the following beneficial effects: (1) The pipe network water quality detection device of the present invention can be directly installed on the pipes of the pipe network and connected with the pipes. The water quality in the network is tested, with good detection accuracy, low cost, high integration, small space occupation, and easy installation and maintenance. (2) Since the water flow (or branch flow) in the detection pipe is constantly updated with the flow of the water flow (or main water flow) in the main pipeline, the water quality of the water flow (or branch flow) in the detection pipe can basically be regarded as the real-time water quality of the pipe network , So as to achieve real-time field detection of water quality.