JPS62225797A - Pump device - Google Patents

Abstract

PURPOSE:To surely detect abnormal conditions such as idle running and shut off operation by stopping a pump motor and performing a classified indication of each abnormal condition of the basis of a temperature increase of the whole of a pump body. CONSTITUTION:A temperature itself of a casing part is measured by a temperature sensor 6, while an inclination of increase in said temperature is measured by measuring circuit part 12. An abnormal condition of a pump body part 1 is determined on the basis of an inclination of temperature increase at a determining circuit part 13. A pump motor 1 is stopped by a control circuit part 14, in the case where an abnormal condition is determined by the determining circuit part 13. And an abnormal condition is displayed at a indicating part 16. Accordingly, abnormal conditions such as idle running and shut off operation can be surely detected.

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) Conventional technology In the conventional technology described in Japanese Patent Application Laid-Open No. 60-237197, which precedes the present invention, abnormal conditions are detected by the current of the pump motor. However, there are drawbacks such as the fact that the current change is small and instantaneous, but detection thereof is cumbersome.

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

B) Means for Solving the Problems The present invention provides a temperature sensor provided in a pump body, a measurement circuit unit that is in contact with the temperature sensor and measures the temperature increase gradient of the pump body, and a nuclear measurement circuit. a determination circuit unit that determines the load state of the front pump body based on the temperature rise gradient measured by the unit; a control circuit unit that stops the pump control signal based on the determination result of the determination circuit unit; The apparatus includes a switching circuit section that stops the pump motor based on the output of the control circuit section, and a display section that distinguishes and displays abnormal conditions for each state based on the output of the determination circuit section.

(E) Function According to the present invention, during normal conditions such as idling and 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 based on this temperature rise state, the vortex air sensor An abnormal state is detected by the measurement circuit section, the determination circuit section, etc., and the pump motor is stopped and the abnormal state is displayed based on the detection results. 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 based on the average value over time rather than the instantaneous value.

(f) Example Next washing An embodiment of the present invention will be described.

In Figure 1, (ri is the pump body, specifically,
Pump motor (2) (described later) and the pump motor (2)
), which houses a Wesco-type impeller rotated by a casing (not shown). The casing portion has a shaft seal portion (1 not shown) through which the rotating shaft of the impeller is inserted.

(3) is a suction side pipe connected to the pump main body mK, and has a reverse valve (4) interposed therein. (5) is a low water level sensor that detects that the water level is below a predetermined value, f6) is a temperature sensor provided in the pump body (1) K, and a recess (not shown) is provided in the casing part. It is buried in a place. ()
) is the discharge side piping connected to the pump body fil K, (8
) is the pressure sensor installed on the discharge side piping (71K), (9) is the flow rate sensor, (1φ is the pressure tank connected to the discharge side piping (7), and (11) is installed at the tip of the discharge side piping (7). The discharge water is poor.

In FIG. 2, (l) is a measurement circuit connected to the temperature sensor (6), which measures the degree of temperature change in the casing of the pump body m, or the temperature rise gradient (Φ).
Reference numeral 131 denotes a determination circuit unit connected to the measurement circuit unit f+2, which determines the abnormal state of the pump body part fl+ based on the temperature increase gradient. The determination circuit unit (1 (to) is configured to determine whether the pump main body ill is idling or closed operation based on the temperature rise gradient as described later.041 is the determination circuit unit (1:
The control circuit section operates based on the output of 1, and the judgment circuit section (1
Only when an abnormal state is determined in step '3, conduction is made and the pump motor m is stopped. The switching circuit is interposed in the high-voltage AC line and stops the pump motor m when the pump control signal stops. (A value of 1 is a display unit connected to the judgment circuit unit (1 country), which indicates abnormal conditions such as idling and shut-off operation of the pump main body [11!'j!

In the third point, Qφ is a comparator that constitutes the main part of the measurement circuit section (+d), and a temperature signal is input to the minus side from between the temperature sensor (6) and the dividing resistor (1 capacitor). The temperature of the pump main body H is determined by comparing the temperature signal with a reference value signal input on the positive side.

The above standards! The α signal is from the ladder resistance approximately 0 to the output terminal (a
). In this measurement circuit part flfi, output ports (Do) to (D2) and H (F″o) to
Temperature data is output sequentially from (F3) and the ladder resistance (l
A step voltage is generated through the gate, and this step voltage as a base signal is compared with nine voltages corresponding to m degrees of the pump main body. When the step voltage value becomes small, a comparator (of lφ) is generated. The output becomes high level and at the same time this high level signal is input to the microcontroller (AI),
A microcomputer (1 liter) detects changes in the pump main body fi+.In this measuring circuit section H, a timer formed inside the microcomputer performs temperature detection operation after a predetermined period of time as described later, and then detects the detection point. The slope of increase in m degrees until reaching .

(2]) is a photodiode that constitutes the main part of the control circuit section (14), and is connected to the I@ operation output boat (GO) of the microcomputer α trout, and is connected to the microcomputer (1 chain) via this boat (Go). It is connected to the determination circuit section (131) inside the.

+22 is coupled to the photodiode (21) of the control signal circuit section (14) >t phototriac, and triac f'! of the switching circuit section 0ω! 3) constitutes the gate circuit.

(24a) (24b) (24c') (24a) are photodiodes constituting the main part of the display section 0 wheel;
It is connected to the S1 section (2) inside the microcomputer Maki through the display section (Iin), and the judgment circuit section (13
Based on the output of 1, the oscillation part (2 (5)
are selectively lit to display various pump statuses by combining the lighting statuses. Each photodiode (z4a) (z
4b') (24c) (24d) are turned on, on, off, off in the case of idling, which will be described later, and turned on, off, on, off in the case of deadline operation, etc., so that many types of abnormalities can occur. Display them separately. The user can easily know the type of trouble and how to deal with the trouble by comparing the display state with the instruction manual.

The Dake is the DC power supply circuit section, which has a step-down transformer (21'11 commutator (28) and an RC smoothing circuit Ii!8 (2!'!1) to supply heavy voltages of 5 volts and 7 volts to various parts. do.

((to) Terminal (engineering NT) in the input signal circuit section
Input an interrupt signal to interrupt the execution state of the microcomputer spider at a desired time.

131) is a switch section, which has switches corresponding to each of the front pressure distribution sensor (8), the flow rate sensor (9), and the low water level sensor (5).

■ is a reset circuit section, which is used to manually operate the reset button when the pump main body section (1) can be started again after the judgment circuit section (131 has stopped the ribbon main body section +1). It is something.

The measurement circuit section 0 and the judgment circuit section are the third
As shown in the figure, the determination criteria are programmed inside the microcomputer I.

In the circuit section f+dQl, when the temperature change of the pump main body section (1) reaches 5 degrees Celsius within 2 minutes, the circuit section f+dQl determines that it is a shut-off operation and outputs the judgment signal, thereby making the control circuit section (I4 non-conducting). As a result, the pump motor (2) is stopped, and the aforementioned cut-off operation display is displayed on the display section 0.

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, the circuit section (I force (for 1 m, pump main body C1)
If the temperature change does not reach 5°C in 2 minutes but reaches 3°C within 10 minutes, it is determined that the pump motor (2) is running idle, and the pump motor (2) is stopped and the display section αφ shows the above-mentioned idle running. Perform display. Dry operation is when air is sucked in from the shaft seal part of the pump body (1) and the suction side piping (3), etc., and the pump body (fl) is in an idle state without pumping water. The repair points are the shaft seal section and the suction side piping (3
), it is immediately determined that it is a joint part, etc.

In the pump control device, when the water faucet (11) is opened and the pressure in the pump body mh1) decreases, the pressure sensor (8
) is activated and based on that, the output boat (G
The control circuit section (14) of O) becomes conductive, the power switching circuit section 0ω is turned on, and the pump motor (2) operates.

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) operates, the control circuit section θ chrysanthemum becomes non-conductive, and the pump motor (2) becomes unable to start.

In addition, in the pump device, when shut-off operation occurs, the pump motor (2) becomes overcharged, and the heat transferred from the motor (2) to the pump casing side through the motor shaft and the frictional heat caused by the agitation of the impeller pump the pump. The temperature of the casing of the main body (1) increases as a whole, and this state is determined by the determination circuit f+31, and 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, and the temperature of the pump main body 11) gradually rises as shown in the figure. If the temperature change after 2 minutes 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 displayed 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 shutoff, and based on the temperature rise gradient, the pump motor is stopped and each abnormal state is prevented. Distinguished displays are now provided, so that the user can immediately identify the location of the failure and perform repair work easily and efficiently. However, since abnormal conditions are detected not by the pump motor's current or winding temperature but by the overall temperature change of the pump body, this temperature change is continuous and gradual; Abnormal conditions in the pump can be detected without constantly monitoring changes and without causing energy loss and thermal deterioration of pump components due to increases in winding temperature.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and the 1st drawing shows one row of water channels, the 21st drawing shows the configuration, the 3rd drawing is an electric circuit diagram, and the 4th drawing is an explanatory diagram of the judgment operation. (1) ... Pump body M, +21... Pump motor, (6)... Temperature sensor, (12... Measuring circuit section, Glue... Judgment circuit section, 04... Control circuit section, U+.
...Switching circuit section, 1161...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 measured by the measurement circuit. a determination circuit unit that determines an abnormal state of the pump main body based on the upward slope; 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; and a display section that distinguishes and displays abnormal states for each state based on the output of the determination circuit section. 2) The pump device according to claim 1, wherein the determination circuit section is configured to determine whether the pump main body is running idly or is running in a closed state based on a temperature increase gradient.