JPS62153595A - Automatic pump - Google Patents

Abstract

PURPOSE:To simplify the arrangement of an automatic pump, by driving the pump with a low power when the power consumption rises up to a predetermined value while when the flow rate of the pump is lowered, the pump is driven with a maximum power, and by stopping the pump when the discharge pressure exceeds a predetermined value. CONSTITUTION:A control device 10 which is operated in accordance with signals from a pump discharge pressure sensor 14, a flow rate sensor 6 and a power consumption detecting device 9 for a motor M, is connected to a rotational speed control device 8 connected with the motor M for driving a pump. The control device 10 carries out low power operation when the power consumption of the motor M rises up to a predetermined value while it carries out maximum power operation when the discharge flow rate of the pump lowers, and the control device 10 stops the operation of the pump when the discharge pressure of the pump exceeds a predetermined value. Accordingly, it is possible to increase the effective water volume in a pressure tank. Further, since the rotational speed of the pump is only controlled, it is possible to decrease the number of necessary components of the automatic pump, thereby it is possible to simplify the arrangement of the automatic pump.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The invention relates to an automatic pump that controls the rotational speed of a pump motor.

(01) Prior Art In general, in Wesco type pumps, when the pump flow rate decreases, the motor input current increases extremely, and in the worst case, the motor may be damaged.

In order to eliminate this increase in motor input current,
In the conventional technology described in Publication No. 6874, when the faucet is throttled to reduce the faucet flow rate, the bypass flow path opens to compensate for this decrease in flow rate, increasing the flow rate of the bypass flow path, and reducing the overall flow rate. From a practical standpoint, the flow rate of the pump is kept constant without decreasing.

However, in this type of conventional technology, a plurality of valve devices such as a main valve and a control valve for opening and closing the bypass flow path, and further an operating mechanism such as a resistance valve and a diaphragm for controlling the valve device are provided. Therefore, the number of parts and manufacturing cost increase due to the valve device and operating mechanism, and there is a drawback that malfunctions may occur due to foreign objects in the water.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and uses the above-mentioned prior art technique by simply controlling the rotation speed of the pump motor without providing the bypass flow path, valve device, actuation mechanism, etc. It has the same function as .

B) Means for Solving the Problems The present invention provides a pump motor that drives the pump body part, a rotation speed control circuit that controls the rotation speed of the pump motor, and a power consumption that detects the power consumption of the pump motor. A power detection circuit, a pressure sensor and a flow rate sensor provided on the discharge side of the pump body part, and a control that operates the rotation speed control circuit based on the outputs of the power consumption detection circuit, the pressure sensor, and the flow rate sensor. @ device, the control device operates the pump motor at a predetermined low power when the detection signal value of the power consumption detection circuit reaches a predetermined value, and the control device operates the pump motor with a predetermined low power, and also controls the detection signal of the flowmeter sensor. The pump motor is configured to operate at substantially maximum power when the signal value falls below a predetermined value, and to stop the pump motor when the signal value detected by the pressure sensor reaches a predetermined value. This is what I did.

(E) Effect According to the present invention, even if the pump flow rate decreases and the power consumption of the pump motor increases, the power consumption is detected by the power consumption detection circuit and the pump motor is controlled to a predetermined level. Energy-saving operation with low power consumption. If the pump flow rate decreases further, the flowmeter sensor detects this decrease in flow rate and operates the pump motor at approximately maximum power, causing the discharge side pressure to instantly reach a predetermined value, and as a result, the pump motor It is stopped based on the detection signal of the pressure sensor.

(f) Example Next, one embodiment of the present invention will be described.

In FIG. 1, (1) is a Wesco-type pump body part, which has a pump motor (2), which will be described later, that drives an impeller (not shown). (3) is a check valve provided on the suction side, (4) is a pressure sensor provided on the discharge side, (51 is a small pressure tank, (6) is a flow rate sensor, and (7) is a discharge water column.

In FIG. 2, (8) is a rotation speed control circuit that controls the rotation speed of the pump motor (2). (9) is a power consumption detection circuit that detects the power consumption of the pump motor (2);
O+ is a control device composed of an electric circuit such as a microcomputer, and operates a rotation speed control circuit (8) based on the outputs of a power consumption detection circuit (9), a pressure sensor (4), and a flow rate sensor (6).

Next, the circuit configuration of the control device (10) will be explained together with the operation of the automatic pump. In Figure 3, the horizontal axis shows the original delivery q,
The discharge pressure P and power consumption W are plotted on the vertical axis, and the QH characteristics and QW characteristics are shown.

In the above-mentioned eye-operated pump, when the faucet (7) is gradually closed,
Regarding the QW characteristic, as the current meter Q decreases, the power consumption W gradually increases and reaches a predetermined value W1. Then, the power consumption detection circuit (9) detects this predetermined value W1 and sends a W1 signal to the control device 00), and the control device (10) operates the rotation speed control circuit (8) at the predetermined low power value W1. . Here, if we soften the ratio by - water ffQ2, when the rotation speed control circuit (8) is operated at a predetermined low power value W1, the power is saved by W2 - W1 compared to the general example shown by the dotted line.

Further, in the automatic pump, when the flow rate Q further decreases to below a predetermined value F, the flow rate sensor (6) outputs a detection signal 0 at the off point 0 of the flow meter sensor (6) in this case,
The control device α0) operates the pump motor (2+) with approximately the maximum power of this automatic pump.Then, the discharge side pressure instantly reaches the predetermined value P2, and the pressure sensor (4) outputs the detection signal P2. The control device α0) is a rotation speed control circuit (8
) to stop the pump motor (2). In this automatic pump, since the pump motor (2) is driven with the maximum electric power, the off point P2 of the pressure sensor (4) can be instantly and sufficiently raised, and since the off point P2 can be set high, Pressure tank (51) can increase the effective water capacity.
Ql is the flow L at the on point of the pressure sensor (4), Q3 is the flow meter at the off point of the flow d sensor (6), and A is the load curve.

(G) Effects of the Invention Since the invention is configured as described above, the predetermined low power consumption is maintained from the time when the four power consumption reaches the predetermined value until the Hagi output signal value of the flow sensor decreases below the predetermined value. It operates on electricity, so
Raw water can save energy when used. In addition, when the detection signal value of the flow sensor becomes low F below a predetermined value, the discharge side pressure is rapidly increased and the pump motor can be stopped at the high pressure point at this time. You can increase the Further, by omitting various valve devices and operating mechanisms, the number of parts and manufacturing costs can be reduced, and malfunctions caused by foreign objects in the water can be prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a waterway diagram of an automatic pump, FIG. 2 is a configuration diagram of a control system, and FIG. 5 is a characteristic diagram of water pumping and power consumption. (Ll...Pump body part, (2+...Pump motor, (4)...Pressure sensor, (6)...Flow rate sensor,
(8)... Rotation speed control circuit, (9)... Power consumption detection circuit, σ0)... Control device.

Claims (1)

[Scope of Claims] 1) a pump motor that drives the pump body part, a rotation speed control circuit that controls the rotation speed of the pump motor, a power consumption detection circuit that detects the power consumption of the pump motor; A pressure sensor and a flow rate sensor provided on the discharge side of the pump body part, and a control device that operates the rotation speed control circuit based on the outputs of the power consumption detection circuit, the pressure sensor, and the flow rate sensor, The control device operates the pump motor at a predetermined low power when the detection signal value of the power consumption detection circuit reaches a predetermined value, and the control device operates the pump motor at a predetermined low power when the detection signal value of the flow rate sensor decreases to a predetermined value or less. automatic type, characterized in that the pump motor is configured to operate at substantially maximum power when the pressure sensor detects a predetermined value, and to stop the pump motor when the detection signal value of the pressure sensor reaches a predetermined value. pump.