JPS62270875A - Drain cock controller - Google Patents

Abstract

PURPOSE:To improve the reliability of actuator, by constituting each drive circuit, making a motor perform its c.w. or c.c.w. rotation which a motor stop signal by overcurrent detection, possible to be reset, in case of a device which controls the motor according to output of a temperature sensor and opens or closes a drain cock. CONSTITUTION:A sensor unit 20 provided with a temperature sensor 2 and a motor drive unit 30 both are installed there. In this motor drive unit 30, there is provided with a closed drive circuit 5 which sets a drive motor 3 so as to be driven in a cock closing direction at a time when temperature is less than the specified value and is reset by a motor stop signal on the basis of an overcurrent at the time of full-close. And, also there is provided with an open drive circuit 7 which sets the drive motor 3 so as to be driven in a cock opening direction with a water switch 6 turned to ON. And, the sensor unit 20 is constituted to control the closed drive circuit 5 so as to set the drive motor 3 to be driven in the cock closing direction when temperature is less than the specified value after the elapse of the specified time since the water switch 6 has been turned to ON.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drain valve control device used to prevent water pipes from freezing, which automatically opens and closes the drain valve based on temperature detection by a temperature sensor.

[Prior art and its problems]

Traditionally, a temperature sensor detects the temperature, and when the temperature falls below a certain value, the drive unit is controlled to automatically close the drain valve, while the drain valve can be opened as needed when the water is used. There are various types of drain valve control devices.

For example, the fully automatic antifreeze water supply system for flush toilets disclosed in Japanese Patent Publication No. 51-32894 detects the air temperature using a thermistor-based temperature sensor, and when the temperature falls below a certain level, it operates a solenoid valve to close the drain valve. In addition to draining water from the water supply pipes, when using the toilet, open the drain valve to supply water to the high tank, and close it again after storing water.

In addition, the temperature switch of the drain valve disclosed in Japanese Patent Publication No. 60-35588 detects the temperature with a temperature sensor,
When the temperature is below a certain level, the flip-flop function is used to maintain the output so as to close the drain valve, and when using water, the output of the flip-flop is reversed and opened by turning on the operation switch. When the temperature is below a certain level, the output of the flip-flop is reversed after a predetermined period of time and the plug is closed.

In such conventional devices, the former uses a solenoid valve, and the latter uses a motor to open and close the valve, but in both cases, the solenoid valve and motor are stopped by a limit switch, so the following steps are taken: There is a certain point.

In other words, limit switches have a mechanical switch contact structure, and because they are installed near water pipes and outdoors, they tend to deteriorate over time and malfunction due to long-term use, and are susceptible to deterioration such as rust. Poor reliability and weather resistance,
Moreover, it is inferior in accuracy, reliability, and stability.

Furthermore, since a limit switch is attached to the drive part itself of the motor, etc., when installing the above-mentioned conventional equipment, etc. to existing equipment that uses motors, etc., the existing motor, etc. must also be replaced or improved. This is extremely disadvantageous in terms of cost.

In addition, in the latter case using a motor drive system, the forward and reverse rotation directions of the motor are controlled using a flip-flop function, that is, a function that inverts and holds the output in response to the human power state, so there is a limit switch on the motor side. On the other hand, since the circuit side maintains the output state, power consumption increases, which is a serious problem for this type of control device that is used for a long time.

[Means for solving problems]

The present invention aims to provide a drain valve control device that solves the problems existing in the prior art described above, and is achieved by the device shown below.

That is, the drain valve control device [1] (Fig. 1) according to the present invention controls the drive motor (3) by temperature detection by the temperature sensor (2).
), the drive motor (3) is set to drive in the closing direction when the temperature is below a certain value, and a motor stop signal based on overcurrent when fully closed is set. Closed drive circuit reset by (
5), and set the drive motor (3) to drive in the opening direction by manually turning on the water flow switch (6),
It is equipped with an open drive circuit (7) that is reset by a motor stop signal based on an overcurrent when fully opened, and furthermore, when the temperature is below a certain value after a certain period of time has passed since the water flow switch (6) is turned on, the drive motor (3) A circuit is provided which controls the closing drive circuit (5) so as to be set to drive in the opening direction and reset by a motor stop signal when fully opened.

[For production]

Next, the operation of the present invention will be explained.

In the drain valve control device [1] according to the present invention, the closed drive circuit (5) enters the set state when the temperature drops below a certain value. Therefore, the drive motor (3) is driven and the drain valve is closed. When the drive motor (3) stops, a motor stop signal based on the overcurrent is fed back to the drive circuit (5) to reset the circuit (5) and stop the drive motor (3).

On the other hand, when it is desired to use water in this state, when the water supply switch (6) is turned on, the open drive circuit (7) is set and the drive motor (3) is driven in reverse to open the water drain valve. Then, when the drive motor (3) stops, the drive circuit (7) is reset in the same manner as described above. Also, at the same time as the switch (6) is turned on, a timer etc. is activated,
If the temperature remains below a certain value even after a certain period of time has elapsed, the drive circuit (5) is operated again and the drain valve is closed in the same manner as above.

In this way, the drive motor (3) is stopped by feeding back the motor stop signal generated by the stop and resetting each independent drive circuit (5) and (7), so that the drive motor (3) stops. When this is the case, there is no output from each drive circuit (5), (7).

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a professional circuit diagram of a water drain valve control device according to the present invention, Fig. 2 is a time chart of signals of various parts in the circuit diagram, and Fig. 3 is an electric circuit of the motor control unit in Fig. 1. figure,
FIG. 4 is an external configuration diagram of the drain valve control device.

First, the circuit configuration of the present device [1] will be explained.

The present device [1] is broadly divided into a sensor unit (20) and a motor control unit (30).

The sensor unit (20) includes a removable temperature sensor (2) using a thermistor or the like. On the other hand, (21) is a comparison circuit, which has a reference voltage (threshold value) that is variably set by the detection voltage of the temperature sensor (2) and the volume (22).
are compared, and the results are applied to the inputs of the NAND circuit (23) and the OR circuit (24). Further, (25) is a first timer composed of a counter, and the output side of this timer is the above-mentioned OR circuit (
24). (26) is a second timer also configured with a counter, and this input terminal is connected to the above-mentioned OR circuit (26).
4), and the output side is connected to the output of the NAND circuit (23
) input. The output side of the NAND circuit (23) and the input side of the first timer (25) are connected to the motor control unit (
30) to the connection terminals (33) and (34).

On the other hand, in the motor control unit (30), the input end of the closed drive circuit (5) is connected to the connection terminal (33) and also grounded via the antifreeze switch (3I).

Further, the input side of the open drive circuit (7) is connected to the connection terminal (34) and also grounded via the water flow switch (6). Each of these drive circuits (5) and (7) has a function of controlling the drive motor (3) to rotate forward and reverse, respectively. Furthermore, the unit (30) is an overcurrent detection circuit that detects an overcurrent of the drive motor (3) and applies a motor stop signal based on this to the drive circuits (5) and (7) to reset the drive circuit. (60).

Next, referring to FIG.
0) will be explained in more detail. In FIG. 3, the same parts as in FIG. 1 are given the same reference numerals. First, the closed drive circuit (5) consists of a pair of input negation OR circuits (35
), (36) form a flip-flop (37), the output of which is supplied to the base of a switching transistor (38). Further, the collector of the transistor (38) is connected to the DC power line (H) via relay coils (39) and (40).

On the other hand, the drive motor (3) is a DC motor, and its wiring is as follows.

Each input terminal of the motor (3) is connected to a relay switch (
41) and (42), and the break contacts of the switches (41) and (42) are commonly connected to the negative side of the current transformer (61) in the overcurrent detection circuit (60). Ground through. In addition, switches (41) and (42)
Each make contact is connected in common and connected to the DC power line.

This one switch (41) is connected to the relay coil (39).
) is switched by excitation.

On the other hand, the open drive circuit (7) is also the same as the above drive circuit (5).
Similarly, a flip-flop (45) is configured by the input negation OR circuit (43) and (44), and its output is supplied to the base of the switching transistor (46), and the collector of the transistor (46) is connected to the relay coil. (4
7) and connect to the power supply line (H) via (48).

Note that the relay coil (47) switches the relay switch (42) of the drive motor (3).

Also, install a beam wire between the power line (H) and the ground (
51) and the water lamp (49) and antifreeze lamp (50).
) to connect. This switch (51) is switched by the relay coils (40) and (4g), and the water flow lamp (49) is activated by excitation of the relay coil (48) on the drive circuit (7) side. The antifreeze lamp (50) is activated by excitation of the side relay coil (40).
are selectively lit. As a result, even when both relay coils are not excited, the open/close status of the drain valve is displayed. Furthermore, flip-flops (37), (
The inverted output of 45) is connected to the base of a transistor (53) via an input negation OR circuit (52), and blinks an operating lamp (54) connected to the collector.

On the other hand, the overcurrent detection circuit (60) includes the current transformer (61), a buffer amplifier (62) connected to the secondary side of the current transformer (61), a rectifier circuit (63) that converts this output signal into DC, and this circuit ( A comparator circuit (65) that compares the output voltage of
) and a timer circuit (66) that outputs a reset signal (S, ) based on the comparison result with a slight delay, and the output side of this circuit (66) is connected to each of the flip-flops (3).
7), connect to the reset manual power of (45).

This overcurrent detection circuit (60) functions as follows.

Now, when the drive motor (3) stops and a load is applied, an overcurrent flows and an induced voltage is generated on the secondary side of the current transformer (61).

This voltage is amplified by a buffer amplifier (62) and converted into DC by a rectifier circuit (63). This direct current signal is input to a comparator circuit (65), and the output state is inverted depending on the magnitude of the signal. As a result, the timer circuit (66) is set and outputs a reset signal (Sr) after a predetermined period of time, and the flip-flop (37)
(45) is reset.

Next, the overall operation of this device [1] will be explained.

It is now assumed that the temperature (air temperature or water temperature) is relatively high and the drain valve is open. In this case, the comparison circuit (21
) output level is L (low level), therefore N A
The output of the ND circuit (23) is H (high level). On the other hand, when this state shifts to a low temperature state and the output of the temperature sensor (2) falls below the reference voltage of the volume (22), the output (Dl) of the circuit (21) is reversed as shown in Fig. 2 (a). In other words, it becomes H. As a result, the OR circuit (2
The output of step 4) becomes t, the second timer (26) is set, counts the time T1 (about 2 seconds) shown in FIG. 2(d), and outputs a single pulse (So). Therefore, N
The output of the AND circuit (23) becomes L in response to the pulse (S, ), inverting the input state of the drive circuit (5), that is, the flip-flop (37), and making the output H. As a result, the transistor (38) is turned on and the relay switch (41) is switched. Therefore, current flows through the drive motor (3) in the direction of arrow CP', closing the drain valve.

When it is fully closed, the drive motor (3) stops and an overcurrent flows. This change is detected by the current transformer (61), and a reset signal (S') is output by the function of the overcurrent detection circuit (60) described above.The flip-flop (37) is reset by this signal (Sr). The output becomes L, the transistor (38) turns off, and the drive motor (3)
stops in the closed state. In addition, this drive circuit (5
) The other drive circuit (7) is not affected at all by the operation of the drive circuit (7).

Next, in this state, if you want to use the water, just turn on the water supply switch (6). The switch (6) is manual and can be turned off (OFF) by, for example, releasing your hand.
)do. As a result, the input (D2) of the drive circuit (7), that is, the flip-flop (45) is as shown in FIG. 2(b).
The state will be reversed and the output will be set to H.

Then, the transistor (46) is turned on and the relay switch (42) is switched. As a result, current flows through the motor (3) in the direction of arrow (Q), opening the drain valve. When it is fully opened, an overcurrent due to the stoppage of the motor (3) is detected as described above, and the flip-flop (45) is reset.

Therefore, the drive motor (3) stops in the open state. In this case, the other drive circuit (5) is not affected at all.

Also, when the water flow switch (6) is turned on, the first timer (
25] is set, and the time T! is set as shown in FIG. 2(c). (
After counting (about 15 minutes), the second timer (26) is set and the single pulse (So) is output. At this time, when the temperature is low, the input of the NAND circuit (23) is H, so the circuit (23) responds to the pulse (S,).
23) outputs L. As a result, the function of re-opening the drain valve is achieved in the same manner as described above.

Note that when the temperature is high, the drive circuit (5) is not activated by the NAND circuit (23).

In addition, a sensor unit (20) and a motor control unit (
30) can be separated from the connection terminals (33), (34). In this case, the drain valve can be closed by manually operating the antifreeze switch (31).

In this way, each drive circuit (5), (7) is set independently only when operating the drive motor (3),
It is reset when the motor (3) stops.

That is, when the motor (3) is in a stopped state, both circuits (5) and (7) are in a reset state, and the power consumption of the circuits is small.

FIG. 4 shows the external configuration of such a device [1]. In this figure, the same parts as in FIGS. 1 and 3 are given the same reference numerals to clarify the structure.

In FIG. 4, (70) is a motor unit that includes the drive motor (3) and a predetermined reduction gear mechanism.

(71) is a drain valve, and the output of the motor unit (70) is transmitted to the valve (73) via the transmission part (72).
73) to open and close the valve.

Although the embodiments have been described above, the present invention is not limited to these embodiments. For example, other means such as a position sensor may be used to detect motor stoppage, and each logic etc. may be replaced with a microcomputer etc. that performs the same function.

In addition, the detailed circuit configuration, arrangement, time values, parts, etc. may be arbitrarily changed without departing from the spirit of the present invention.

[Effects of the Invention] ' As described above, the water drain valve control device according to the present invention has independent drive circuits that rotate the drive motor forward and reverse in response to a stop signal of the drive motor, preferably a stop signal based on overcurrent detection. Since it has a reset function, it has the following effects.

■ The motor is stopped by resetting the drive circuit that controls the drive motor, rather than stopping the motor using a limit switch that has mechanical contacts on the drive motor itself, as in the past, eliminating the problems associated with limit switches. It is possible to construct a highly reliable and weather-resistant device that does not rust or deteriorate due to long-term use. Further, if the motor is stopped by detecting an overcurrent according to the optimum embodiment, highly accurate, reliable, and stable opening/closing operation can be guaranteed.

- Since all motor drive circuits are reset when the motor is not being driven, the power consumption of the circuit can be significantly reduced and malfunctions can be prevented.

- Existing motors can be used as is without modification or replacement, and a system can be configured simply by connecting this control device, contributing to cost reduction.

[Brief explanation of drawings]

Figure 1: Block circuit diagram of the water drain valve control device according to the present invention, Figure 2: Time chart of signals of various parts in the circuit diagram, Figure 3: Electric circuit diagram of the motor control unit in Figure 1, Figure 4 is an external configuration diagram of the drain valve control device. In addition, in the drawing,

Claims (1)

[Scope of Claims] [1] In a drain faucet control device that opens and closes a drain faucet by controlling a drive motor based on temperature detection by a temperature sensor, the drive motor is driven in the direction of closing the faucet when the temperature is below a certain value. The closing driving means is set to , and is reset by the motor stop signal when fully closed, and the drive motor is set to drive in the opening direction when the water flow switch is turned on, and is reset by the motor stop signal when fully opened. The valve opening driving means is set to drive the driving motor in the closing direction when the temperature is below a certain value after a certain period of time has elapsed since the water flow switch is turned on, and is reset by a motor stop signal when the water flow switch is fully closed. A drain valve control device comprising a valve closing drive means. [2] Claim 1, wherein the motor stop signal is a signal based on overcurrent detection of the drive motor.
Drain valve control device as described in section.