JPH0196494A - Pump controller - Google Patents

Abstract

PURPOSE:To prevent a water channel system of a pump from refrigeration by connecting a drain pipe to a discharge cock near the upstream side to open a drain valve interposed in the drain pipe on the basis of a temperature detecting signal less than a predetermined value. CONSTITUTION:When a temperature detected by a temperature censor 41 is lowered lower than 2 deg.C, a controller is transferred from a normal running made to a heat insulating running mode to generate a high level signal from an output port G1 of a microcomputer 13 only for a predetermined time t1 and open a drain valve 12, so that pressure in the discharge side piping 6 is reduced to operate a pressure sensor 7 and start a pump motor 2. After about t1 time the pump motor 2 is stopped by a flow sensor 8. The whole water in the water channel system is alternated with warm well water in one cycle of starting and stopping the pump motor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pump control device that prevents freezing of a pump waterway system.

(b) Conventional technology In the conventional technology disclosed in Japanese Utility Model Publication No. 1275/1983, which precedes the present invention, when there is a risk of freezing, a very small current is supplied to the pump motor to prevent it from rotating. Although the motor generates heat to insulate the bomb casing, its heat insulating power can only be applied to the vicinity of the bomb casing and has the disadvantage that it is insufficient for the entire water passage system of the pump.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and provides a pump control device that can prevent freezing of the water channel system of the pump.

(D) Means for Solving Problems The present invention detects the state of a waterway system including a pump main body and a pressure tank using a pressure sensor or a flow rate sensor, and uses a microphone based on a detection signal from the sensor to In a pump motor that starts and stops, a drain pipe is connected to the waterway system near the upstream side of the discharge faucet,
A drain valve is interposed in the drain pipe, and the drain valve is opened by operating the microcomputer based on a temperature detection signal of a predetermined value or less from a temperature sensor of the waterway system.

(E) Effect According to the present invention, when the ambient temperature decreases, the condition can be detected once by the sensor, and the drain valve is intermittently set to raI by the output signal of M(rJ). Each time the pump is opened, the state of the water passage system of the pump changes1, and this change is detected by a pressure sensor or tit sensor, and the pump motor is started or stopped by the microphone based on the detection signal from the sensor. Therefore, the water in the canal system is replaced by warm water even in winter.

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

In FIG. 1, (1) is a pump main body, which is specifically composed of a pump motor (2) (described later), a pump casing (not shown), etc. 1. @ Pump motor (
2) The pump casing is covered with a storage cover along with other parts. (3) is a suction side pipe connected to the pump main body (1), and has a reverse valve (4) interposed therein. (5
) is a low water level detection sensor that detects when the water level is below a predetermined value due to a water outage, etc., (6) is a discharge side piping connected to the pump body (1), and (7) is installed on the discharge side piping (6). (8) is a flow rate sensor. a Ka sensor (
7) and dE quantity setting (8) detect the state of the entire flow path of the water pumped up by the pump, that is, the condition of the waterway system. (9)
is a pressure tank connected to the discharge III pipe (6), (1o
) is a manually operable discharge faucet provided at the tip of the discharge side piping (6). (11) is a drain pipe, which is connected to the discharge side pipe V (6) as a part of the water channel system of the pump near the upstream side of the discharge faucet (10). (12) is a drain 2fr consisting of a solenoid valve installed in the drain pipe (11), the operation of which will be described later.

In Fig. 2, (13) is a microcomputer that constitutes the main part of the pump control device, including a central processing unit (14), a memory (15), and a read-only memory (16) provided in the main memory (15). have. This microcomputer (
The function 13) will be described later.

(17) is a V source circuit section connected to a commercial power source, and a switching circuit section (17) connected in series to the pump motor (2).
8). The switching circuit section (18) is formed of a triac (19) as an alternating current limiting element, and is turned on and off via a phototriac (20) on the gate side of the triac (19).

(21) is a control circuit unit that sends a control signal to the switching circuit unit (17), which can be connected to the drive output port (Go) of the microcomputer (13), and also connects to the photodiode (
22) and is coupled to the phototriac (20) of the switching circuit section (18).

(23) is the DC power supply circuit section, and the step-down transformer (24)
,! ! It has a flow element (25) and an RC smoothing circuit (26), and supplies voltages of 5 volts and 7 volts to various parts.

(27) is an interrupt signal circuit section which applies the commercial %tit voltage to the commutator (25) via the step-down transformer (24).
A full-wave rectified signal is input from the commutator (25), and the aftermath v! , applying a freeze signal to the base of the transistor (28) to make the transistor (28) conductive for a predetermined time;
Therefore! - Interrupt No. 16 synchronized with the half cycle of the commercial power supply frequency is output from the output terminal of the transistor (28), and this interrupt signal is input to the port (INT).

(29) is a reset circuit section, and when the pump motor (2) is stopped due to various failures, the pump motor (2) can be restarted by manually operating the reset button (30).
It is possible to start the .

(31) is an overcurrent detection circuit that detects an excessive X flow of the pump motor (2), and detects the flow value of the pump motor (2) with a current transformer (32).
・Connected to the secondary side terminal (bl) (bl) of (32)! ! A voltage signal as a reference value is input by inputting the proportional voltage of one current value to the positive side terminal of the humpator (35) via the current flow rate 33) and the RC smoothing circuit (34), and inputting this proportional voltage to the negative side. Compare with to determine the results.

A signal serving as this reference value is inputted from the ladder resistor (36) via the output terminal (e). The Jtfi detection circuit section (31) detects the output port (D o
) to (D 2 ) and (F o ) to (F s ) are sequentially output to generate a stepped voltage through the ladder resistor (36), and this stepped voltage as a reference signal and the pump motor ( 2) with the voltage from the current transformer (32) which is proportional to the 'fjl current value, and when the stepped voltage value becomes small, the output of the comparator (35) becomes high level and at the same time this high level signal is transmitted to the microcontroller (32).
11) into the boat (AO), and the microcomputer (13)
), the overcurrent of the pump motor (2) is determined and detected.

(37) is a display device, and a photodiode (38a>(
Bo h (Eo) with 38b) (38c) (38d)
It is connected to the drive unit (39) inside the microcomputer (13) via (El), (E2), and (E3). Display bag! (37
), the drive unit (39) is activated based on the output of the microcomputer (13).
are each photodiode (38a) (38b) (38c)
(38d) are selectively lit to distinguish and display various states such as warming operation, idling, and shut-off operation depending on the combination of lighting conditions.

(40) is a temperature detection circuit section, which has a temperature sensor (41) and a comparator (42), and connects the temperature signal of the temperature sensor (41) to the connection part with the dividing resistor (43) to the comparator L/-tor (42). ) to the negative side of this temperature I! The signal is compared with the reference value signal inputted on the positive side to detect the temperature that requires warming. The temperature sensor (41) is installed in a state where heat transfer is good to the water in the waterway system, and specifically, the temperature sensor (41) is installed in the discharge side piping (6) which is most likely to freeze or in the pump main body near the electric circuit part. (1) etc. Further, the reference value signal is inputted from the ladder resistor (36) via the output terminal (e). This temperature detection circuit section (40) selects output ports <D o ) to (D 2 ) corresponding to various temperature reference values stored in the read-only memory (16) of the microphone 113). and (F o
) - (F 3) to temperature data [7F (H), 7 (H)
, ... Do(H)] in sequence to set the ladder resistance (36
), and compares the stepped voltage as a reference value signal with the voltage corresponding to the temperature of the pump waterway system, and when the stepped voltage value changes small, the output of the comparator (42) is At the same time, the high level signal is input to the boat (A1) of the microcomputer (13), and the microcomputer (11) detects the temperature required for the heat-retaining operation. Specifically, the temperature is 2℃ or less, which requires thermal insulation operation,
Detects a temperature of 9″C or higher, which will cancel the heat retention operation.

(44) is an automatic changeover switch section, and the pressure sensor (7
), the flow rate sensor (8) and the low water level sensor (5)
Sinch parts (7a) (8a) (5) corresponding to
It has a).

The pump control device is provided with a control circuit section (45) for opening and closing the drain valve (12) i1f. The control circuit section (45) is an output board for driving the microcomputer (13).
(G1) and the electromagnetic relay coil (46
), and when the electromagnetic relay coil (46) is energized, it functions to close the relay contact (47) of the power circuit section <17) and open the drain valve (12). This control circuit section (45) includes the drive output boat (G1
) when the output of transistor (4) inverts to high level.
8) is made conductive, and the transistor (49) is made conductive, thereby energizing the electromagnetic relay 1 (46) through T.

Further, the microcomputer (13) has a program configured as follows in connection with its heat retention operation control.

As shown in FIG. 3, the microcomputer (13) determines whether the current operation mode is the normal operation mode or the heat retention operation mode, and if the current operation mode is the normal operation mode, the temperature detected by the temperature sensor <41) is 2. Check if it is below ℃,
If the temperature is 2 degrees Celsius or lower, the mode shifts to the keep-warm operation mode and the keep-warm operation mode is set. In the heat retention operation mode, a high level signal is output from the output port (G1) for a predetermined time t1 to open the drain valve (12). Within this time t1, the pump motor 2) performs only one cycle of starting and stopping. In this one cycle, the total water in the waterway system is m
Replaced with warm well water. In this one cycle, in the pump, the pressure in the discharge side piping (6) decreases due to the opening of the drain valve (12), and the pressure regulator (7) operates, which starts the pump motor (2). After 11 hours have elapsed, the drain valve (12) is closed and the flow in the waterway system has stopped, and the flow rate sensor (8) operates to stop the pump motor (2).

In the microcomputer (13), after the aforementioned time t1 has elapsed,
The temperature detected by the temperature sensor (41) is checked, and if the temperature is 9°C or higher, the mode is shifted from the heat retention mode to the normal mode, and the normal mode is set.

In the pump control device, when the water faucet (10) is opened and the pressure in the pump main body (1) decreases, the pressure sensor (7) is activated.
) is activated, and based on this, the control circuit section (21) of the output port (Go) of the microcomputer (13) becomes conductive, and the power switching circuit section (18) is turned on, turning on the pump motor (2).
is activated.

When the faucet (IO) is closed and the flow rate disappears, the flow rate sensor (8) is activated, and based on this, the phototriac (22) of the control circuit (21) becomes non-conductive, and the pump motor (2) also stops. .

If the water level on the suction side drops, turn on the low water level switch (5
) is activated, the phototriac (22) of the control circuit (21) becomes non-conductive, and the pump motor (2) becomes unable to start.

Further, when the detected temperature drops to 2°C or less, the control device shifts from the normal operation mode to the heat retention operation mode, and increases the temperature from the output port (G・1) of the microcomputer (13) for a predetermined time t1. A level signal is output to open the drain valve (12), which lowers the pressure in the discharge side pipe (6), activates the pressure sensor (7), and starts the pump motor (2). After time t1, the pump motor (2) is stopped by the flow rate sensor (8). One cycle of starting and stopping the pump motor (2) replaces the entire water in the waterway system with warm well water. Thereafter, the temperature detected by the temperature sensor (41) is checked, and if it is 9° C. or higher, the mode shifts from the heat retention mode to the normal mode.

(G) Effects of the Invention Since the present invention is configured as described above, when there is a risk of freezing, it is possible to start a heat retention operation based on the detection result of the temperature sensor, and the heat retention effect can be improved compared to the conventional example. Unlike pump casing only, the water in the entire waterway system can be replaced with warm well water, which can affect the entire waterway system and prevent it from freezing.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a waterway diagram, FIG. 2 is an electric circuit diagram, and FIG. 3 is a flowchart showing a heat-retaining operation. (1)...Pump main body, (7)...Pressure sensor,
(8)...Flow rate sensor, (9)...Pressure tank, (
10)...Discharge faucet, (11)...Drain pipe, (12)
)...Drain valve, (13)...Microcomputer, (41)...
...Temperature sensor.

Claims (1)

[Claims] 1) A pressure sensor or a flow rate sensor detects the state of a waterway system including a pump main body and a pressure tank, and a microcomputer starts and stops the pump motor based on a detection signal from the sensor. A drain pipe is connected to the waterway system near the upstream side of the discharge faucet,
Control of the pump, characterized in that a drain valve is interposed in the drain pipe, and the drain valve is opened by operating the microcomputer based on a temperature detection signal of a predetermined value or less from a humidity sensor of the waterway system. Device.