JPH0658264A - Automatic water feed device - Google Patents

Abstract

PURPOSE:To prolong the life of the device by grasping the operating condition with a simple construction, and calling maintenance at an appropriate time. CONSTITUTION:A pressure tank 8 and a pressure detecting means 7 are connected to the discharge side of a pump 1, and the shaft horsepower of the pump during operation is computed by the signal from the pressure detecting means 7. The integrated value of the shaft horsepower is set as a maintenance and inspection judging value, and the result of operating condition is output to an outward communicating means 10b. A control part 10a is constituted of an electronic circuit centering around an indication control element such as a microcomputer. Hereby, the operating time and the operating condition are exactly grasped, and the maintenance and inspection can be communicated to the outward at appropriate time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an automatic water supply system, and more particularly to a system for grasping the operating state of the system.

[0002]

2. Description of the Related Art In a conventional automatic water supply system, a pressure tank and a pressure switch are provided on the pump discharge side, and the pump is started and stopped by turning the pressure switch on and off. Since the pressure switch itself does not have a current capacity capable of flowing the operating current of the pump, the pressure switch was provided in the operation circuit for operating the relay having a large current capacity. Further, a timer and a holding circuit for delaying the pump operation even if the pressure switch is turned off are provided.

FIG. 3 shows an operation circuit for controlling the operation of a conventional water supply device. When the pressure switch 22 is turned on, the motor coil 23 is excited and the motor relay 2
4 is operated and the pump 1 is operated. Pressure switch 22
When the switch is turned on, the holding relay circuit is provided so that the timer 25 is operated at the same time and the motor relay coil 23 is excited even if the pressure switch 22 is turned off.

Further, there is also one in which a microcomputer and a power control element are incorporated to form an electronic control circuit to control the operation of the automatic water supply device. In the case of such a configuration, it is possible to monitor and detect an abnormal state of the device based on the detection data by counting and integrating the operating time and combining various sensors in the microcomputer and the peripheral digital circuit. Further, there is also one that combines various display devices to notify the operating state to the outside of the device.

[0005]

As described above, these conventional devices are provided with a basic operation control system for automatically supplying water when necessary as a single device. However, since the device is used stably for a long time, it is not possible to grasp the operation status of the pump, detect an abnormal state of the pump, and perform automatic recovery from the abnormal state. In the conventional automatic water supply device, in order to monitor the operating state, it is necessary to provide, for example, a power meter dedicated to the device or a flow meter in the pump discharge pipe line in addition to the automatic water supply device.

In a conventional device incorporating an electronic control device using a microcomputer or the like, a control for self-monitoring an operating state is incorporated as a water supply device by applying various sensors. However, the increase in the number of types of sensors increases the cost of the device and also requires a space for accommodating the control unit.

Further, in the conventional device, the detection parameters for monitoring the operating condition are the operating cumulative time and the cumulative water supply amount, and the maintenance and inspection of the device are regularly performed with this value as a standard.

Originally, it is necessary to perform maintenance and inspection when the device is out of order, and when the operation is stopped even for a short time, such a device is inconvenient. (Including replacement of) is also required. For this reason, a failure prediction time (parts consumption time) is set and used as a guide for periodic inspections.

A pump used in a relatively large water supply system has an operating point close to a design point (high efficiency point) and a constant axial output of the pump. Therefore, the energy level given to each part from the shaft output is constant, and the estimated failure time can be selected by the accumulated pump operation time. However, in a small automatic water dispenser that is often installed in a small-scale apartment house, a pump with a specific speed of about 100 to 200 has a driving operating point of 0.
The maximum area varies depending on the amount of water supplied. Therefore, if the accumulated operating time is used as a guideline for regular inspections, it is possible to perform inspections when they are not needed or to bring down the equipment before inspection, such as when the vehicle is operating with an overload that is not expected. There is also a method of installing a power meter or a flow meter for exclusive use of the apparatus and referring to the measured value as described above, but another control device is attached to automatically determine the measured value.

[0010]

In order to solve the above problems, an instruction control unit for controlling the operation of the pump and an arithmetic processing unit for processing the operation information for the control are provided to control the start and end operations of the pump. Not only that, pump discharge pressure is taken in at every arbitrary divided time during operation, axis output is calculated by calculation processing, and the integrated value of this axis output value is stored in the storage area of the processing unit or peripheral storage element of the processing unit. Memory. The integrated value of this axis output is constantly compared with the set value, and when they match, information for urging maintenance and inspection is sent to the external communication means. The external contact means can send information to a communication path such as a telephone line by adding a relatively simple circuit configuration to the instruction control unit, in addition to display and notification.

[0011]

[Operation] The specifications of each part of the pump are determined so that it will operate at high efficiency at any specified point. Water discharge pressure against water supply,
By determining the required suction head and calculating the pump losses, the shaft output can be found corresponding to the pump input.

The cube root of the reference shaft output ratio of the arbitrary shaft output is equal to the square root of the reference total lift ratio of the total lift at the arbitrary shaft output, which is equal to the specific speed at the arbitrary shaft output. From this, the shaft output is expressed as a function of the total pump head, and the shaft output can be obtained from the total pump head (sum of discharge pressure and suction pump head) during pump operation. Equal to speed).

Since the suction pump head is substantially determined by the intended use of the automatic water dispenser, the total pump head can be obtained by providing a pressure sensor on the pump discharge side to detect the discharge pressure.

For the integration of the shaft output, the shaft output is calculated and calculated from the discharge pressure every unit time, and the values are added. The unit time division is set short within the allowable range of the response time of the pressure sensor and the calculation processing time.

As described above, conventionally, the minimum necessary sensor for controlling the operation of the automatic water dispenser is used, and only the data processing in the instruction control unit and the arithmetic processing unit is used to accurately instruct the maintenance and inspection time as the device. be able to. This saves maintenance time and costs and extends the operating life of the device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a pump 1 is constructed by directly connecting an impeller (not shown) of a pump portion to a rotary shaft of a motor 2. A suction pipe 4 is connected to the suction side of the pump 1, and the lower end of the suction pipe 4 reaches the tank water 3 which is separated from the water supply and stored in the tank. A discharge pipe 5 is connected to the discharge side 5 of the pump 1. Discharge pipe 5
Is provided with a valve 5a. The discharge pipe 5 is connected to the common pipe 6, and a large number of branched faucets 6a are provided at the end of the common pipe 6 (only four are shown in FIG. 1).

The suction head is the sum of the height L from the center of the pump 1 (the center of the impeller) to the surface of the stored tank water 3 plus the pipe loss of the suction pipe.

The discharge pipe of the pump 1 is provided with a pressure sensor 7 and a pressure tank 8 which constitute pressure detecting means. When water is supplied from the faucet 6a and the water in the pressure tank 8 is supplied, the pressure in the pressure tank 8 decreases. The signal from the pressure sensor 7 is input to the instruction control unit 10a of the control unit 9. A signal from the pressure sensor 7 is sent to the instruction control unit 10a by a preset operation operation (operation start,
A pressure determination unit 11 that performs operation control processing by comparing each control value (operation stop) is provided. The pressure determination unit 11 also serves as a calculation process for calculating the operating state from the input pressure signal. The signals from the instruction control unit 10a are output to the motor 2, respectively.

Further, a signal output to the external communication means 10b is connected from the instruction control section 10a, and a maintenance call such as maintenance inspection can be displayed and notified.

In FIG. 2, the motor 2 is connected to the power source 12. A switching element triac 13 is connected in series to the power supply circuit. A phase advancing capacitor 14 is connected to the motor 2.

The instruction control unit 10a is mainly composed of an instruction control element 15 such as a microcomputer. Vdd of the instruction control element 15 from the power source 12 through the power transformer 16, the rectifying / smoothing circuit 17, and the constant voltage circuit 18,
A circuit is connected to the Vss port. Instruction control element 1
The reference timer 5 is made by the clock circuit 19.

A signal is input to the instruction control element 15 from the port P10. A pressure sensor 7 is connected to the port P10 and fetches pressure information.

One side of the zero-cross timing input circuit 20 is connected to the secondary side of the power transformer 16 and the other side is connected to the port INT of the indicating element 15.

A signal is output from the port P20 of the instruction control element in synchronization with the zero-cross timing, and is connected so as to drive the triac 13 of the switching element via the phototriac 21.

From the start to the stop of the pump operation, the discharge pressure is taken in every unit time in parallel with the operation control. First, the total head is calculated from the pressure taken in. The constant value of the subsequent arithmetic processing includes the shaft output and the total head value at the specific point of the pump characteristic. From these constants, the specific speed at any total head can be calculated. Conversely, from the specific speed, the shaft output in the previous arbitrary total head can be calculated. These relationships are summarized and the shaft output is calculated as a function of the total head.

It is possible to judge how much load the pump has operated by adding the shaft outputs for each unit time and by adding up the integrated values. Since the maintenance time of the pump parts initially set can be set with a constant axis output, it has a judgment reference value as an integrated axis output, and constantly compares it with the measured integrated axis output during operation. When the measured integrated axis output reaches the reference integrated axis output, a signal is output to the external communication means to prompt maintenance and inspection of the device.

[0028]

As described above, according to the present invention, the operation of the automatic water supply system is controlled, so that the operating condition of the pump can be grasped and the external communication for prompting the maintenance and inspection of the system can be performed at the optimum time. As a result, the operating life of the automatic water supply device can be extended.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an automatic water supply device showing an embodiment of the present invention.

FIG. 2 is a control circuit diagram for controlling the device.

FIG. 3 is an operation circuit of a conventional device and a device configuration diagram.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump part, 2 ... Motor, 5 ... Discharge pipe, 7 ... Pressure detection means (pressure sensor), 8 ... Pressure tank, 10 ... Indication control part, 15 ... Indication control element, 13 ... Triac.

Claims (2)

[Claims] 1. An instruction controller for connecting a pressure tank to the discharge side of a pump having a motor, providing pressure detecting means on the discharge side of the pump, and controlling the operation of the pump by a signal from the pressure detecting means. , An automatic water supply device equipped with an arithmetic processing unit for processing operation information for controlling, an external communication means capable of arbitrarily displaying or notifying the instruction control unit or the pump installation remote unit by an output signal from the instruction control unit, The detection means is a pressure sensor that continuously obtains an output with respect to the pressure, and the discharge pressure value from the pressure sensor and the pump operating time are calculated by the calculation processing unit to be specified in this device, and the calculation result value is arbitrary When the set value is reached, the automatic water supply device is characterized by displaying and informing the external communication means to prompt maintenance and inspection. 2. The discharge pressure from the pressure sensor according to claim 1, which is taken in at every arbitrary dividing time during pump operation, and is divided by using the taken-in discharge pressure value, set suction head value, and specific speed specific to this pump as parameters. By calculating the pump shaft output value for each time and comparing the integrated value with an arbitrary set value, when the comparison condition is met, the external communication means is displayed and informed to prompt maintenance and inspection. Automatic water supply device.