JPS6079197A - pump equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a pump device in which a pump is driven by a control motor that can control the number of revolutions and is operated to maintain a constant pressure.

A pump device designed to save energy must control the electric motor that drives the pump in order to minimize the power required for the pump.

In other words, in the conventional configuration, when the electric motor drives the pump, it is always operated at maximum output, and excess pressure is stored in a pressure tank and the electric motor is stopped at a predetermined pressure. Water was being discharged from the pressure tank.

In such a configuration, since the operation is not continuous, it seems to be efficient, but there are times when the operation is performed at an unnecessary high pressure due to pressure accumulation, which greatly goes against energy saving when considered over a long period of time.

The present invention was made in view of these circumstances, and
The purpose of this invention is to provide a pump device that provides efficient operating characteristics and is extremely convenient for energy saving.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a block diagram showing an outline of the pump device of the present invention, and Fig. 2 shows the characteristics of the voltage applied to the motor. Figure 3 is a diagram showing the operating characteristics of the pump, and Figure 4 is a diagram showing the operating characteristics of the pump.
FIG. 5, which is a diagram showing the configuration of the control circuit, is a diagram of the control system showing the principle of operation.

In FIG. 1, the pump device includes 1 a pump, 2 a motor, 3 a control circuit, 4 a pressure sensor, 5 a check valve, 6 an accumulator, 7 a water intake port, -2-8 a discharge port, 9 is a well, and 10 is a water tap.

A portion 11 surrounded by a dotted line is a unit.

In FIG. 2, the vertical axis shows the voltage applied to the motor 2, and the horizontal axis shows the water volume of the pump 1.The voltage applied to the motor 2 is determined by the pressure sensor When the high voltage VM1 is applied by detecting the pressure fluctuation in 4 and the amount of water increases, the characteristic shown by the dotted line in the figure is exhibited.

Then, when the water tap 10 is closed and the water volume decreases,
The characteristics shown by the solid line in the figure are shown.

That is, VMl is the applied voltage when pump 1 is started, VM2 is the applied voltage when suiseki is 20 Q/min,
VMO is the total voltage at the maximum water volume, VM3 is the minimum water volume immediately before the pump 1 is stopped, and M4 is the applied voltage when the pump 1 is stopped.

In FIG. 3, the pump 1 has a lift height of the pump 1 on the vertical axis,
The horizontal axis shows the water volume, and the dotted line indicates the characteristics of the water tap 10.
The characteristic shown by the solid line is the characteristic when the hydrant 10 is closed and the water volume decreases.

That is, H4 is the pressure when the pump 1 is stopped, Hl is the pressure at which the water tap 10 is opened and the internal pressure of the accumulator 6 is reduced, and the motor 2 is started by the pressure sensor 4.
2 is a constant pressure obtained by the control, HO is the pressure at which the control saturates, and H3 is the lowest pressure at which the pump 1 is stopped.

Moreover, 12 shows the characteristics of a conventional pump without control in comparison.

In FIG. 4, the control circuit is configured such that the signal from the pressure sensor 4 is amplified by an amplifier AMP and input to comparators A and B.

The comparator A and the comparator B are connected to a sequence control unit 13, and the sequence control unit 13 includes a start switch 14 for the motor 2, a switch 15 for stopping the motor 2, and a control switch 16. .17 is connected.

Further, a comparator C is provided and is configured to receive the signal of VM3, and the comparators A1, 4-4, and B are also configured to receive the signals of 1-14 and H1, respectively. .

In FIG. 5, the operating principle of the control circuit 3 is shown. 18 is the power supply 0N, 119 is the pressure H detection motor start, 2
0 is motor stop, 21 is motor start, 22 is motor voltage VM detection, 23 is pressure 1t-(detection, 24 is VM decrease, 25 is VM increase, 26 is motor operation with VM4, 27 is pressure H detection, 28 The area within the frame indicated by the motor stop and dotted lines forms the constant pressure control section 29, and the other areas indicate the operation of the circuit for automatic operation control.

In such a configuration, the pump device is capable of pumping up water from the well 9 and sending it to the hydrant 10, and the pressure sensor 4 measures the water supply pressure to the hydrant 10 depending on whether the hydrant 10 is opened or closed. It is detected and a signal is given to the control circuit 3 to control the water supply pressure to be constant.

That is, as shown in FIG. 3, as the hydrant 10 opens and closes, it operates so that the water supply pressure to the hydrant 10 remains constant over a fairly wide range of water pressure.

-5- Then, when the water tap 10 is closed and the water volume decreases and the pressure reaches H3, the voltage applied to the motor 2 becomes VM3, which is selected by the comparator C and a signal is sent to the sequence control unit 13. The remoter 2 is accelerated to increase the pressure by L, the pressure sensor 4 detects the pressure H4, and the motor 2 is stopped.

When the motor 2 stops, a constant pressure is maintained in the accumulator 6, and the stopped state continues without any decrease in pressure until water is discharged from the faucet 10.

The state of such operation will be explained with reference to FIG. 5. In the control system, if the pressure detection signal H obtained by the pressure sensor 4 using the power supply 0N18 is smaller than Hl, the motor 2 is started 21, and if H is large, the control system starts the motor 2. Motor stop 20
becomes.

While the motor 2 is operating, the water supply pressure is kept constant by the pressure constant control unit 29, but the operation is controlled by the pressure sensor 4 detecting the pressure and obtaining a signal. The applied voltage VM is controlled.

-6- In other words, if 1-1 > 1-10, VM decrease24
Therefore, if l-1<HO, the VM increase will be 25.

In addition, if VM>VM3, the operating range of the constant pressure control section 29 is reached, but if VM≦VM3, the motor VM4 is operated 26, and if H≧H4 by the pressure drop detection 27, the motor is stopped 28, )- If 1<H4, the motor is in VM4 operation 26.

These control systems are not limited to this embodiment, and include a pressure sensor 4 that can control the pump 1 to a constant pressure, and detect the rotation speed of the motor 2 and control the control circuit 3. In particular, in the present invention, the pump 1
In order to stop the pump, the comparator C detects a decrease in the rotational speed of the motor 2 under constant pressure control and controls the stop of the motor 2. Therefore, when the water supply is stopped, the discharge pressure of the pump 1 is unnecessarily high. This is a highly efficient system that is completely different from conventional systems that operate pressure switches.

-7- There are various methods for detecting the rotation speed of the motor 2. The voltage applied to the motor 2 may be detected, or the rotation speed may be detected using a detector such as a tachogen. A flow meter may also be used.

Ultimately, it is only necessary to detect that the output of the pump has decreased and then operate the pump.

That is, the voltage applied to the motor 2 is controlled according to the required amount of water so that the pressure is always constant, and the constant water pressure can be controlled over an extremely wide range up to a small amount of water that is close to closing the faucet 10.

Particularly, compared to conventional control pumps that use flow rate switches, small amounts of water can be detected by rotating the motor 2, making it possible to widen the control range of the pump 1 and increase operating efficiency.

In addition, in the conventional technology, two pressure sensors 4 were required, one for ON and one for OFF, in order to control operation stoppage.
According to the effects of the present invention, one pressure sensor 4 is sufficient (it can be turned on and used as a signal source to maintain a constant pressure, and turned off by detecting the rotation speed of the motor 2. .

Therefore, only one expensive pressure sensor 4 is required, which makes it possible to reduce the price, and also reduces the time and effort required to adjust the pressure, which is more convenient.

As explained above, according to the present invention, the operating characteristics of the pump are configured such that the motor is activated according to the amount of water discharged from the faucet, and when the amount of water decreases, the rotation speed of the motor is detected and stopped. In addition to being efficient, it has a simple configuration, has a large energy saving effect, and has extremely large industrial effects.

Fig. 2 shows the characteristics of the voltage applied to the motor, Fig. 3 shows the operating characteristics of the pump, and Fig. 4 shows the characteristics of the voltage applied to the motor.
FIG. 5, which is a diagram showing the configuration of the control circuit, is a diagram of the control system showing the principle of operation.

DESCRIPTION OF SYMBOLS 1... Pump, 2... Motor, 3... Control circuit, 4... Pressure sensor, 10... Water tap.

-9- Loaf 4 - Diagram -bqa- ・　29

Claims (1)

[Claims] The pump is driven by a control motor and a check valve is provided, a pressure sensor is provided upstream of the check valve, the pump is controlled to a constant pressure by a signal from this pressure sensor, and a decrease in the output of the pump is detected. A pump device characterized in that the pump is stopped by making the pressure exceed the constant pressure.