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锐钜科技有限公司 Shenzhen Ruiye Technology Co., Ltd.
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Application of pressure transmitter in secondary water supply industry
| 作者: lytrannet | 发布时间: 2019-06-02 | 532 次浏览 Source: | Author: lytrannet | Published: 2019-06-02 | 532 views 分享到: | Share to:
At present, in order to prevent the impact on urban residents' water use, domestic and production pumps are not allowed to be installed directly on the municipal pipe network. In order to solve the problem that the water supply equipment can be connected to the municipal water supply network without generating negative pressure, and it will not affect other users' water use, it is necessary to add a flow controller and a split-cavity voltage stabilization compensation tank between the pump inlet and the municipal pipeline network. The flow controller constantly monitors the pressure of the municipal pipe network. While ensuring that the municipal pipe network does not generate negative pressure
At present, in order to prevent the impact on urban residents' water use, domestic and production pumps are not allowed to be installed directly on the municipal pipe network. In order to solve the problem that the water supply equipment can be connected to the municipal water supply network without generating negative pressure, and it will not affect other users' water use, it is necessary to add a flow controller and a split-cavity voltage stabilization compensation tank between the pump inlet and the municipal pipeline network. The flow controller constantly monitors the pressure of the municipal pipe network. While ensuring that the municipal pipeline network does not generate negative pressure, the original pressure of the municipal pipeline network can be fully utilized. In this case, it is necessary to use a non-negative pressure water supply system.
When the tap water of the municipal pipeline enters the regulating tank at a certain pressure, the air in the pressure-stabilizing compensation tank is discharged through the vacuum eliminator. After the water is filled, the vacuum eliminator is automatically closed. When the tap water can meet the water pressure and water demand, the water supply equipment directly supplies water to the water pipe network through the bypass check valve; when the pressure of the water pipe network cannot meet the water requirements, the system will pass the pressure sensor, or the pressure controller, electricity The contact pressure gauge gives the pump start signal to start the pump operation.
The frequency conversion constant pressure water supply system is mainly composed of PLC control unit, inverter, pump unit motor, water supply network, water storage tank and pressure sensor, as shown in the figure below.
The constant pressure water supply pump station uses multiple water pumps and motors, which can be put into work according to the water consumption. Therefore, the power of a single water pump motor is not large, and a backup pump is installed in the system for non-stop maintenance. The number of pumps is controlled by the PLC, and the motor speed is controlled by the inverter to meet the needs of different water consumption.
Pressure sensors are one of the main accessories in non-negative pressure water supply equipment and variable frequency constant pressure water supply equipment. The original remote pressure gauge was upgraded to a pressure sensor. The previous remote pressure gauge not only made the entire water supply system unstable, It also needs to be replaced frequently to increase the cost of after-sales service. The use of pressure sensors not only solves the problem of unstable water supply, but also is not easy to damage. At the same time, it also reduces the after-sales cost.
The high-sensitivity pressure switch or pressure sensor installed on the water supply pipe network detects the pressure change of the water supply pipe network when the water consumption changes, and continuously transmits a change signal to the microcomputer. According to different operating states, the compensation amount is dynamically controlled, so as to achieve dynamic pressure balance and ensure that the pressure of the water supply network is constant to meet the needs of users.
In fact, pressure sensors can be divided into: pressure sensors and pressure transmitters based on the output signal and whether an amplification circuit is installed in the body. At the same time, according to whether it can measure corrosive media and adapt to harsh environments, it can be divided into: general-purpose and isolated, according to the signal is divided into current-type pressure sensors: generally 4 to 20mA; there are voltage signal-type pressure sensors : 0 to 12V.
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