RU22159U1 - INSTALLING INDIVIDUAL WATER SUPPLY - Google Patents

Description

Figure 1 presents a diagram of a pumping unit; in Fig 2 - block diagram of the control unit; Fig. 3 shows a comparative graph of the water pressure at the outlet of the installation (shown for comparing the graphs of the water pressure at the outputs of the pumping stations with the classic controller (a) and the electronic capacity controller (b).

The individual water supply installation consists of a hydraulic pump 6 pump 6 (standard with a rubber diaphragm or with a float valve 10), a control unit 2, connecting fittings and pipeline 9, a pressure gauge 4, a vacuum pump 8, a suction pipe 12, a check valve 14, a valve the reset device to prevent freezing of water in the pump 24, as well as valves 5, 7, 25. On the panel of the control unit 2 (23) there are emergency indicators 15, 16, 17, 18, 19, the start button for protection against dry running 22, the fuse 21 switch off s 20. Works installation follows.

Valves 5 and 25 are closed. Through air valve 7, air is pumped to a pressure equal to half the working pressure of the water at the pump outlet. Using a vacuum pump 8, a vacuum is created in the suction pipe 12 and through the check valve 14 from the reservoir 13, water fills the suction pipe, as well as the pump and the connecting pipe 9. After that, the valve 26 closes and with the help of an electric cord with a plug 1, the pumping station is connected to the mains. The switch "network 20 is supplied with a voltage of 220 V to the control unit 2 (23). The indicator 19 on the control unit 23 panel lights up. This means that the pressure at the pump outlet is less than 0.5 BAR and the dry running protection circuit prohibits the operation of the pump motor. We press the Start button 22, the dry run protection circuit is turned off and the pump motor starts to work. Since the pump 6 and the suction pipe 12 are filled with water, pressure is generated at the pump outlet when the pump impeller rotates. When the pressure at the inlet of the dry-running protection sensor exceeds 0.5 BAR, which is controlled by pressure gauge 4, the start button is released. Further, the pump operates in automatic mode.

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Consider the operation of the control unit, Figure 2 (12).

The control unit consists of a water pressure sensor 1; temperature sensor 2, which turns on the pump at a temperature close to 0 ° C, which prevents "defrosting in cases when the pump is installed in an unheated room; water flow sensor 3; water flow switch 6; temperature switch 5; water pressure regulation switch 4; minimum water pressure switch 8 (additional protection against dry running); voltage relay 10; power supply circuit of the pump motor 9 and power supply 11. The water flow sensor 3 is used to turn on the pump, it also performs the function of protecting against unproductive pump operation. The control unit operates as follows.

Control and adjustment devices 1,2,3,4,5,6,8,10 are triggered when the parameters at their input are outside the permissible limits and the signals from their outputs are fed to a logic device 9, which in turn sends a signal to prohibit the operation of the electric motor or change of its revolutions within the necessary limits. The entire circuit is powered by a power supply 11.

We trace the operation of each control channel. Scheme of maintaining a constant pressure at the pump outlet. Pressure sensor 1 when decreasing or increasing the water pressure at the pump outlet from a predetermined

magnitude sends a mismatch signal to the pressure control relay 4, and it, in turn, controls the voltage of the motor through the logic device 7 and the power supply circuit of the electric motor 9 in such a way that when the pressure decreases, the engine speed increases, and when the pressure increases, they decrease. Thus, at the outlet of the pumping station, the pressure is kept constant from minimum to maximum water flow.

To turn off the pump in the absence of water flow, a water flow sensor 3 and a flow switch 6 are used. When water is not consumed, the flow switch 6 supplies a logic inhibit signal 7 to the operation device, and vice versa, when water starts to be consumed, the pump resumes operation. The channel for protection against overheating and “defrosting” consists of a temperature sensor 2 and a temperature switch 5. When the temperature of the pump casing is higher

+ QQ ° C or + HS temperature relay gives a signal prohibiting the operation of the electric motor at + 60 ° C or turning on the electromagnetic valve 24 (Figure 1). When the solenoid valve is turned on, water starts to flow out of the valve into the drain, the pump starts to work and, due to the temperature of the sucked-in water (usually + 8 -10 ° С), heats up by 3-4 ° С, after which the valve closes and the pump station goes into standby mode water. In the case of prolonged exposure to low temperatures, this process is repeated regularly, which provides protection against “defrosting”.

The minimum pressure switch 8 is used to protect against dry running (in the event of suction pipe leakage or lack of water in the pond). When air appears during the pump (no water or air leaks), the outlet pressure drops sharply, which is detected by pressure sensor 1 and through the pressure control switch 4, the low pressure signal is supplied to the minimum pressure switch 8, and it in turn sends a signal to prohibit the operation of the electric motor to the logic device 7. In the event of a voltage drop of less than 160V or higher Nia introduced a 250V circuit protection - Voltage relay. When the voltage of the mains voltage beyond these parameters, the voltage relay 10 gives a signal prohibiting the operation of the electric motor. When the parameters of the electric network return to normal, the operation of the pumping station resumes automatically. Emergency operating modes for user convenience are displayed on the control panel (23 of Figure 1) using LED indicators.

The use of electronic adjustment of pump performance allows you to maintain a constant outlet pressure in the range from minimum to maximum water flow and voltage fluctuations from 170 to 240 V.

Claims (3)

1. An individual water supply installation comprising a pump, pipelines, an air-water tank-accumulator with a rubber diaphragm, an automatic control unit and a manometer, characterized in that it is additionally equipped with a water flow sensor, a water pressure sensor, a minimum temperature sensor and a minimum pressure switch.  2. Installation according to claim 1, characterized in that in the storage tank, the rubber diaphragm is replaced by a float valve. 3. Installation according to claim 1, characterized in that it is additionally equipped with a manual or electric mini-vacuum pump for filling the suction line with water.