JPH0363680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pump device that determines an abnormal state of a pump main body and stops a pump motor and displays an abnormal state based on the determination result.

(B) Prior art In the conventional technology described in Japanese Patent Application Laid-open No. 60-237197, which precedes the present invention, abnormal conditions are detected using the current of the pump motor, but it is Since the current change during an abnormal state is small and instantaneous, it has drawbacks such as difficulty in detecting it.

(C) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks, and easily and reliably detects abnormal conditions such as idling and shut-off operation, and stops the pump motor and displays the abnormal condition. be.

(d) Means for Solving the Problems The present invention provides a temperature sensor provided in the pump body, a measurement circuit connected to the temperature sensor to measure the temperature rise gradient of the pump body, and a a determination circuit unit that determines an abnormal state of the pump body based on a temperature increase gradient measured by the circuit unit; a control circuit unit that stops a pump control signal based on a determination result of the determination circuit unit; a switching circuit that stops the pump motor based on the output of the circuit;
The apparatus further includes a display section that distinguishes and displays abnormal states for each state based on the output of the determination circuit section.

(e) Function According to the present invention, when an abnormality occurs such as idling or shut-off operation, the temperature of the pump body rises due to frictional heat caused by pump agitation and overheating of the pump motor, and the temperature sensor and measurement circuit are activated based on this temperature rise state. An abnormal state is detected in the pump section and the determination circuit section, and further, based on the detection result, the pump motor is stopped and the abnormal state is displayed. Since the abnormal state is determined based on the temperature rise state of the entire pump main body rather than the current change of the pump motor, the abnormal state is reliably and stably detected using an average value over time rather than an instantaneous value.

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

In FIG. 1, reference numeral 1 denotes a pump body, which is specifically composed of a pump motor 2 (described later) and a casing (not shown) housing a Wesco-type impeller rotated by the pump motor 2. ing. The casing portion has a shaft seal portion (not shown) into which the rotating shaft of the impeller is inserted.
Reference numeral 3 denotes a suction side pipe connected to the pump body 1, with a check valve 4 interposed therebetween. 5 is a low water level sensor that detects that the water level is below a predetermined value, and 6 is a temperature sensor provided in the pump body 1, which is embedded in a recess (not shown) provided in the casing part. . 7 is a discharge side pipe connected to the pump body 1, 8 is a pressure sensor provided on the discharge side pipe 7, 9 is a flow rate sensor, 10 is a pressure tank connected to the discharge side pipe 7, and 11 is the tip of the discharge side pipe 7. This is a discharge faucet installed in the section.

In FIG. 2, reference numeral 12 denotes a measuring circuit section connected to the temperature sensor 6, which measures the degree of temperature change in the casing section of the pump main body section 1, or the so-called temperature rise gradient. Reference numeral 13 denotes a determination circuit section connected to the measurement circuit section 12, which determines whether or not the pump main body section 1 is in an abnormal state based on the temperature increase gradient. The determination circuit section 13 is configured to determine whether the pump main body section 1 is running idly or not, based on the temperature increase gradient, as will be described later. 1
Reference numeral 4 denotes a control circuit section which operates based on the output of the determination circuit section 13, and when the determination circuit section 13 determines an abnormal state, it becomes non-conductive and stops the pump motor 1. Reference numeral 15 denotes a switching circuit section which is interposed in the high-voltage AC line and stops the pump motor 1 when the pump control signal is stopped. Reference numeral 16 denotes a display unit connected to the determination circuit unit 13, which displays abnormal conditions such as idling and shut-off operation of the pump main body 1.

In FIG. 3, reference numeral 16 denotes a comparator that constitutes the main part of the measurement circuit section 12, which inputs a temperature signal from between the temperature sensor 6 and the dividing resistor 17 to the minus side, and inputs this temperature signal to the plus side. The temperature of the pump body 1 is obtained by comparing it with the reference value signal. The reference value signal is inputted from the ladder resistor 18 via the output terminal a. This measurement circuit section 12
Now, based on the temperature reference value stored in the memory 20 of the microcomputer 19, temperature data is sequentially output from the output ports D0 to D2 and F0 to F3 to generate a stepped voltage through the ladder resistor 18, and this reference signal is When the step voltage value becomes smaller, the output of the comparator 16 becomes high level, and at the same time, this high level signal is output to the microcomputer 19.
The temperature of the pump body 1 is detected by the microcomputer 19. In this measuring circuit section 12, a timer formed inside the microcomputer 19 performs a temperature sensing operation after a predetermined period of time as will be described later, and measures the temperature rise gradient until reaching the sensing point.

A photodiode 21 constitutes the main part of the control circuit section 14, and is connected to the driving output port G0 of the microcomputer 19, and is connected to the determination circuit section 13 inside the microcomputer 19 via this port G0. .

Reference numeral 22 denotes a phototriax coupled to the photodiode 21 of the control signal circuit section 14;
It constitutes a gate circuit.

24a, 24b, 24c, and 24d are photodiodes that constitute the main part of the display section 16, and are connected to the microcomputer 1 through ports E0, E1, E2, and E3.
It is connected to the drive unit 25 inside 9. Display section 1
6, the drive section 25 controls each photodiode 24a, 24 based on the output of the determination circuit section 13.
Various pump states are displayed by combinations of lighting states in which lights b, 24c, and 24d are selectively turned on.
Each photodiode 24a, 24b, 24c, 2
4d is set to ON, ON, OFF, OFF in the case of idling, which will be described later, and ON, OFF, ON, OFF in the case of shut-off operation, etc., so that various types of abnormal states are distinguished and displayed. The user can easily know the type of trouble and how to deal with it by comparing the display state with the instruction manual.

26 is a DC power supply circuit section, and step-down transformer 2
7, having a commutator 28 and an RC smoothing circuit 29,
5 volt and 7 volt voltages are supplied to various locations.

30 is the interrupt signal circuit section, and the terminal (INT)
Input an interrupt signal to the microcomputer 19 at the desired time.
interrupts the execution state of

Reference numeral 31 denotes a switch section, which has switches corresponding to the pressure sensor 8, flow rate sensor 9, and low water level sensor 5, respectively.

32 is a reset circuit section, which connects the determination circuit section 13
The reset button 33 is manually operated to enable the pump main body 1 to be started again after the pump main body 1 has been stopped.

As shown in FIG. 3, the measurement circuit section 12 and the judgment circuit section 13 have their judgment criteria programmed inside the microcomputer 19.

In the circuit sections 12 and 13, when the temperature change of the pump main body section 1 reaches 5 degrees Celsius within 2 minutes, the control circuit section 14 is set to be non-conductive by determining that it is a shut-off operation and outputting the determination signal. The pump motor 2 is stopped, and the above-mentioned cut-off operation is displayed on the display section 16. Therefore, the user is able to see that the cause of the pump stoppage is due to shut-off operation, and can immediately identify the repair location and repair method. Specifically, in the case of a failure due to shut-off operation, it can be immediately determined that the failure location is the pump stop sensor 9 (flow rate sensor) or the like.

In addition, in the circuit sections 12 and 13, if the temperature change in the pump body section 1 does not reach 5 degrees Celsius in 2 minutes but reaches 3 degrees Celsius within 10 minutes, it is determined that the pump is running dry and the pump motor 2 is stopped. At the same time, the display section 16
The above-mentioned idle running display is performed. Dry operation is when air is sucked in from the shaft seal of the pump body 1 and the suction side piping 3, etc., and the pump body 1 is idling without pumping water, so the repair point is the shaft seal. It can be immediately determined that it is a joint part of the suction side piping 3, etc.

In the pump control device, when the faucet 11 is opened and the pressure in the pump main body 1 decreases, the pressure sensor 8 is activated, and based on this, the control circuit 14 of the output port G0 of the microcomputer 19 is made conductive, and the power supply is turned on. The switching circuit section 15 is turned on and the pump motor 2
is activated.

When the faucet 11 is closed and the flow rate disappears, the flow rate sensor 9 is activated, and based on this, the control circuit section 14 becomes non-conductive, and the pump motor 2 also stops.

Further, when the water level on the suction side decreases, the low water level switch 5 is activated, the control circuit section 14 is rendered non-conductive, and the pump motor 2 cannot be started.

In addition, in the pump device, when shut-off operation occurs, the pump motor 2 becomes overloaded, and the casing of the pump main body 1 is heated due to the heat transmitted from the motor 2 to the pump casing side through the motor shaft and the frictional heat caused by the stirring of the impeller. The overall temperature rises, this state is determined by the determination circuit section 13, the pump motor 2 is stopped, and a cut-off operation display is displayed.

When idle operation occurs, the pump motor 2 rotates at high speed, generates heat even though it is not as high as during the above-mentioned cut-off operation, and the temperature of the pump main body 1 gradually rises as shown in Fig. 4, and after 2 minutes. If the temperature change is 5° C. or less and the temperature change after 10 minutes is 3° C. or more, it is determined that the pump is running idle, and this indication is made when the pump motor 2 is stopped.

(G) Effects of the Invention Since the present invention is configured as described above, the temperature of the entire pump body rises during operations such as idling and shut-off, and based on the temperature rise gradient, the pump motor is stopped and each abnormal state is stopped. Distinguished displays are now provided, so the user can immediately identify the location of the failure and perform repair work easily and efficiently. In addition, since abnormal conditions are detected based on the overall temperature change of the pump body, rather than the current or winding temperature of the pump motor, this temperature change is continuous and gradual, and unlike current detection, the abnormal state An abnormal state of the pump can be detected without constantly monitoring the winding temperature and without causing energy loss and thermal deterioration of pump parts due to increase in winding temperature.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a hydrographic diagram, FIG. 2 is a configuration diagram, FIG. 3 is an electric circuit diagram, and FIG.
The figure is an explanatory diagram of the determination operation. 1... Pump main body, 2... Pump motor, 6
...Temperature sensor, 12...Measuring circuit section, 13...
Judgment circuit section, 14... Control circuit section, 15... Switching circuit section, 16... Display section.

Claims (1)

[Claims] 1. A temperature sensor provided in the pump body, a measurement circuit connected to the temperature sensor to measure the temperature rise gradient of the pump body, and a temperature rise gradient measured by the measurement circuit during idling or shut-off operation. a determination circuit unit that determines an abnormal state such as idling or shut-off operation by comparing the temperature rise gradient based on the temperature increase gradient, a control circuit unit that stops the pump control signal based on the determination result of the determination circuit unit, A pump device comprising: a switching circuit section that stops a pump motor based on the output; and a display section that distinguishes and displays idle running and shut-off operation states based on the output of the determination circuit section.