JPH07279885A - Invertor change-over type water pressurizing and feeding system - Google Patents

Abstract

PURPOSE:To provide a water pressurizing and feeding system in which the speeds of pumps located in a water reserving tank is controlled by changing over inverters. CONSTITUTION:Inverters 31, 32 are provided, corresponding to a plurality of pumps 21, 22 located in a water receiving tank, and a pressure sensor 9 detects a discharge pressure of water led from a pipe and delivers a signal to a control part 11 which compares the signal with a predetermined signal and delivers predetermined frequencies to the inverters 31, 32. Accordingly, the underwater pumps 21, 2.=2 are controlled by means of inverters. With this arrangement, the pumps are efficiently rotated so as to save energy, thereby it is possible to a highly safe system which allows back-up upon failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved pressurized water supply system, and more particularly to a pressurized water supply system which controls the rotation of a pump arranged in a water tank by switching the inverter.

[0002]

2. Description of the Related Art In a water supply system for a high-rise house, water is temporarily stored in a water receiving tank, then pumped to a high water tank such as a rooftop, and the pressure caused by the head of the water is used from this high water tank. A system that supplies to faucets, etc. has been adopted, and in recent years, as a system that has improved this, a pressure reducing valve, that is, a system that uses a valve that keeps the discharge pressure constant regardless of the pumping volume, has been developed. Systems for supplying to faucets have come to be adopted.

FIG. 2 is a conceptual view of the latter water supply system, in which a submersible pump P is installed horizontally in a water receiving tank T, and from this pump P a pipe is connected to each faucet through a check valve CV and a pressure reducing valve RV. It is connected to M. In the figure, PT is a pressure tank,
PS is a pressure switch, E is a water level measuring electrode, and C is a control panel.

In this system, in order to make the discharge pressure constant, the pressure reducing switch RV is controlled by the pressure switch PS, and the discharge pressure is kept constant by the mechanism of this valve. Although such a system has the advantage of not requiring a high water tank, the pump must maintain full rotation to supply water to each faucet, for example, even if most faucets do not use water. , The pump must be fully rotated. Therefore, the degree of loss is large in terms of energy.

As a further improved system, an inverter
It has been proposed that one pump be used and one pump be operated by this inverter control, while the other pumps be operated by a normal commercial power source. In this proposal, it is preferable that only one pump controlled by the inverter be operated, but when both pumps are operated, one pump uses a commercial power source. As a result, more energy is consumed than necessary and energy loss increases.

That is, in this system, the rotation speed is controlled by an instruction from the inverter according to an increase / decrease in the amount of water used, the inverter driving pump is driven, and the end (faucet) pressure becomes constant. To control. Then, when the rotation speed of the inverter drive pump reaches the maximum rotation speed, the constant speed pump is started by the commercial power source that is stopped, and the parallel operation is performed to keep the terminal pressure constant. Then, when the amount of water used decreases, the constant speed pump is stopped and the operation of only the inverter drive pump is resumed. As described above, the constant speed pump consumes more energy than necessary during its operation, and further improvement is required.

[0007]

SUMMARY OF THE INVENTION The present invention is an inverter.
It provides a pressurized water supply system with a water tank integrated with a plurality of driven submersible pumps, and the inverter-controlled pump is rotated according to the usage situation of any faucet, so that it can meet the demand of water. Therefore, the rotational speeds of all the pumps can be adjusted to provide an energy-saving type water supply system.

[0008]

The gist of the present invention is a pressurized water supply system in which a plurality of submersible pumps are arranged in a water tank, and each faucet is connected by a pipe connecting the submersible pumps. Each submersible pump is provided with a separate water supply valve and check valve, and further, an inverter corresponding to each pump.
Pressure sensors connected to the pipes, respectively.
The discharge pressure from the pipe is detected by, the pressure signal is input to the control unit, and the control unit obtains the difference from the predetermined signal,
Input the required frequency to the inverter, and then
The present invention relates to an inverter-switching type pressurized water supply system characterized by controlling the number of revolutions of each submersible pump via a turret.

[0009]

The operation and operating state will be described below with reference to examples. FIG. 1 is a conceptual diagram of the water supply system of the present invention. In the figure, 1 is a water tank, during the receiving tank 1, motor controls the rotation speed by changing the frequency submerged - data - water pump with a built-in (not shown) 2 _1, Two ₂ 2 are installed horizontally. The submersible pumps 2 ₁ and 2 ₂ are individually provided with inverters (frequency converters) 3 ₁ and 3 ₂ , water supply valves 4 ₁ and 4 ₂ and check valves 5 ₁ and 5 ₂ . still,
The submersible pumps 2 ₁ and 2 ₂ are motors that give rotational driving force.
(Not shown) are integrated with each other.

The submersible pumps 2 ₁ and 2 ₂ are provided in the water receiving tank 1.
The water inside is pressurized and discharged to the outside of the water receiving tank. The discharged water is supplied to the water supply valves 4 ₁ and 4 ₂ and the check valve 5 respectively.
_It is led to the pipe 6 via ₁ , 5 ₂ and each faucet 7,
7, sent to. The above-mentioned pipe 6 is equipped with a pressure tank 8, a pressure sensor 9, and a water supply valve 10, and the pressure signal detected by the pressure sensor 9 is sent to the control unit 11. Needless to say, 12 is a power source and 13 is a breaker, and in addition to this, a water level measuring electrode and the like are provided. Note that inverter - motor -3 _1, 3 each pump 2 ₁ in consideration of the failure of the _2, 2 ₂ preferably is pre-wired for connection to a commercial power source.

The control unit 11 includes an output unit that outputs a control target pressure, a rotation speed control unit, a setting unit that sets the relationship between the pump rotation speed and the control target pressure, and a maximum rotation speed during variable speed operation. And a storage device for storing. The output section is a section that obtains an output signal of the inverter and outputs a predetermined target pressure from the relationship between the rotation speed of the pump and the control target pressure. The rotation speed control section outputs the output from the output section. This is a part that outputs a control signal for the rotational speed of the pump from the signal and the signal from the pressure sensor. Frequency signal is issued from the control unit 11, inverter - This signal is input to the motor -3 _1, 3 _2, and inverter - motor -3 _1, 3 ₂ water pump 2 ₁ outputs a predetermined frequency , 2 ₂ and not shown are integral motor - motor - to feed, the motor - motor - is able to rotate at the required speed.

In the control section 11 of the water supply system of the present invention shown in FIG. 1, the signal S ₁ obtained by the pressure sensor 9 is first sent to the control section 11, and this control section 1
In 1, while the inverter - control target pressure SV is set signals S ₂ sent from the data -3 _1, 3 ₂ basis. Then, from the difference between S ₁ and the control target pressure SV, the rate of change thereof, etc., the discharge pressure of the pumps 2 ₁ , 2 ₂ becomes
The frequency output signal is such that the frequency output signal is an inverter-3 ₁ ,
Sent to 3 ₂ . Thus inverters - through a capacitor -3 _1, 3 ₂ motor - motor - to shift the rotation of the changing the discharge pressure from the pump 2 _1, 2 _2.

The operation of the water supply system of the present invention is as follows. The inverter drive pump 2 ₁ is controlled by controlling the rotation speed according to an instruction from the inverter by increasing or decreasing the amount of water used.
Is driven to control the pressure at the end (faucet) to be constant. Then, when the rotation speed of the inverter drive pump 2 ₁ reaches the maximum rotation speed, the other inverter drive pump 2 _{2 that} is stopped is started to operate in parallel to keep the terminal pressure constant. When the water consumption is reduced inverter - motor - driven pump 2 ₂ is stopped, again inverter - data - the return to operation of only the drive pump 2 _1.

In the present invention, the pumps 2 ₁ and 2 ₂ that are the center of the system are provided with separate inverters 3 ₁ and 3 _{2 respectively.}
The pump is always driven with the optimum output as the amount of water used increases and the energy loss is extremely small.

[0015]

In the water supply tank integrated pressurized water supply system of the present invention, since the pump can be effectively rotated, energy saving can be achieved, and further, backup which is possible at the time of failure is safe. It has become a highly effective system. Further, low noise and low vibration are achieved by incorporating the pump in the water tank, and further, there are advantages that each part for controlling the rotational speed of the pump can be designed compactly.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a water supply system of the present invention.

FIG. 2 is a conceptual diagram of a conventional water supply system.

[Explanation of symbols]

1 ... water tank, 2 ₁ , 2 ₂ ... submersible pump, 31 ₁ , 3 ₂ ... inverter, 4 ₁ , 4 ₂ ... water supply valve, 5 ₁ , 5 ₂ ... check valve, 6 Pipes, 7 faucets, 8 pressure tanks, 9 pressure sensors, 10 water supply valves, 11 control parts, 12 power supplies, 13 breakers, C Control panel, CV ... Check valve, E ... Water level measuring electrode, M ... Faucet, P ... Submersible pump, PS ... Pressure switch, PT ... Pressure tank, RV ... Pressure reducing valve, T ... Water tank.

Claims (1)

[Claims] 1. A pressurized water supply system in which a plurality of submersible pumps are arranged in a water receiving tank, and each submersible pump is connected to each faucet by a pipe, wherein each submersible pump has a separate water supply valve and A check valve is arranged, an inverter is attached to each pump, and a pressure sensor connected to the pipe detects the discharge pressure from the pipe and inputs this pressure signal to the control unit. Then, the control unit determines the difference from the predetermined signal and determines the required frequency.
Inverter switching type pressurized water supply system, characterized in that the number of revolutions of each submersible pump is controlled via each inverter.