JPH063237Y2 - Water tap control device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a water removal tap control device used to prevent freezing of a water pipe in which a water discharge tap is automatically opened and closed by a drive motor.

[Prior art and its problems]

Conventionally, various types of water removal plug control devices have been known which are capable of automatically closing and opening the water removal plug by controlling a drive motor.

For example, the temperature switch of the water drain plug disclosed in Japanese Patent Publication No. 60-35588 detects the temperature with a temperature sensor, and when the temperature is lower than a certain temperature, the motor is driven using the function of the flip-flop to close the water drain plug. The output of the flip-flop is inverted by turning on the operation switch when the water is used, and the motor is reversely driven to open and close the tap.

However, in such a conventional device, since the motor is stopped by the limit switch, there are the following problems.

In other words, the limit switch has a mechanical switch contact structure, and since it is installed near the water pipe and outdoors, it deteriorates over time due to long-term use and is prone to malfunction.
Further, it is inferior in reliability, weather resistance, etc., in which deterioration such as rust is likely to occur, and inferior in accuracy, reliability, and stability.

Furthermore, since a limit switch is attached to the drive part of the motor itself, when installing the above-mentioned conventional device in the existing equipment that uses the motor, the existing motor must be replaced or improved. It will be extremely disadvantageous.

Also, since the forward / reverse rotation direction of the motor is controlled by using the function of the flip-flop, that is, the function of reversing and holding the output with respect to the input state, there is no choice but to attach a limit switch to the motor side, while Since the circuit side maintains the output state, power consumption becomes large, which is a serious problem for this type of control device that has a long operating time.

[Means for solving problems]

The present invention is intended to provide a water drain plug control device that solves the problems existing in the above-mentioned prior art, and is achieved by the circuit shown below.

That is, the water tap control device (M) according to the present invention includes a temperature sensor (20
When the temperature detected by a) is below a certain value or the first set signal (S ₁ ) is generated when the antifreeze switch (30) is turned on,
The drive motor (2) is switched to the other by the first drive circuit (4) that operates the drive motor (2) in one direction to close it and the second set signal (S ₂ ) based on the turning on of the water flow switch (31). Drive circuit (5) and second drive circuit (5) that operates by opening in the direction
Is provided with an overcurrent detection circuit unit (6) for stopping the drive motor (2) by a reset signal (Sr) based on the detection of overcurrent during stop. In this case, the first drive circuit
(4) is provided with a flip-flop (37) that is inverted by the first reset signal (S ₁ ) and is inverted by the reset signal (Sr), and the second drive circuit (5) is the second reset signal
The flip-flop (45) is inverted by (S ₂ ) and is inverted by the reset signal (Sr).

[Action]

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

The water tap control device (M) according to the present invention first comprises a temperature sensor.
Temperature detected by (20a) is below a certain value, or antifreeze switch
When (30) is turned on, the first set signal (S ₁ ) is output to the drive circuit.
It is supplied to the flip-flop (37) in (4) and inverts the flip-flop (37) to set it. As a result, the drive motor (2) rotates in the closing direction and closes. When fully closed, that is, when the drive motor (2) is stopped at the end of the stroke, an overcurrent flows, which is detected by the overcurrent detection circuit unit (6) and the reset signal
(Sr) is supplied to the flip-flop (37), which inverts the flip-flop (37) to the reset state. Therefore, the drive motor (2) is stopped.

On the other hand, when the water flow switch (31) is turned on, the second reset signal (S ₂ ) causes the flip-flop (4) in the drive circuit (5).
5) and inverts the flip-flop (45) to set it. As a result, the drive motor (2) rotates in the opening direction and opens. Then, when fully opened, that is, when an overcurrent flows due to the stop of the drive motor (2) at the end of the stroke, the overcurrent detection circuit unit (6) detects this, and the reset signal (Sr) outputs a flip-flop (45). And the flip-flop (45) is inverted to be in the reset state. Therefore, the drive motor (2) stops.

Such capping control and capping control are executed by the first drive circuit (4) and the second drive circuit (5), which are provided exclusively for each, and the reset signal (Sr ).

〔Example〕

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

FIG. 1 is an electric circuit diagram of a motor control circuit in a water tap control device according to the present invention, FIG. 2 is a block circuit diagram of the water tap control device including the control circuit, and FIG. 3 is a signal of each part in FIG. FIG. 4 is an external configuration diagram of the water tap control device.

First, in order to clarify the present invention, the configuration of the water tap control device (M) will be described with reference to FIG.

The whole control device (M) is roughly divided into a sensor unit (20) and a motor control circuit (1).

The sensor unit (20) includes a detachable temperature sensor (20a) using a thermistor or the like. On the other hand, (21) is a comparison circuit,
The detected voltage of the temperature sensor (20a) and the reference voltage (threshold value) variably set by the volume (22) are compared, and the result is given to the inputs of the NAND circuit (23) and the OR circuit (24). Also, (25) is a first timer composed of a counter,
This output side is connected to the input of the OR circuit (24). (26)
Is a second timer also composed of a counter, the input side of which is connected to the output of the OR circuit (24) and the output side of which is the NA.
Connect to the input of the ND circuit (23). The output side of the NAND circuit (23) and the input side of the first timer (25) are connected to the connection terminals (33) and (34) of the control circuit (1).

Next, an outline of the motor control circuit (1) will be described. Same circuit (1)
In the connection terminal (33), the first drive circuit (4)
Connect the input side of and ground via the antifreeze switch (30). The connection terminal (34) has a second drive circuit.
Connect the input side of (5) and ground via the water flow switch (31). Each of these drive circuits (4), (5) has a function of controlling the drive motor (2) so as to rotate in the forward direction and the reverse direction. Furthermore, the circuit (1) detects an overcurrent of the drive motor (2) and applies a motor stop signal based on this to the drive circuits (4) and (5) to detect the overcurrent. It has a circuit (6).

Next, the motor control circuit (1), which is the main part of the present invention, will be specifically described with reference to FIG. In the figure, the same parts as those in FIG. 2 are designated by the same reference numerals. First, the first drive circuit (4) is a pair of input negation OR circuits (35), (36).
Form a flip-flop (37), and supplies this output to the base of the switching transistor (38). The collector of the transistor (38) is the relay coil (39),
Connect to DC power line (H) via (40).

On the other hand, the drive motor (2) is a DC motor, and its wiring is as follows.

The input terminals of the motor (2) are relay switch (41),
The break contacts of the switches (41) and (42) are commonly connected to the movable contact (42) and grounded via the primary side of the current transformer (61) in the overcurrent detection circuit (6). In addition, switch (4
Make contacts of 1) and (42) are commonly connected and connected to the DC power supply line. The one switch (41) is switched by exciting the relay coil (39).

On the other hand, the second drive circuit (5) also forms a flip-flop (45) by the input negation OR circuits (43) and (44) similarly to the drive circuit (4), and its output is connected to the switching transistor (46). Supply to the base, and the collector of the transistor (46) is the power line via the relay coils (47) and (48).
Connect to (H). The relay coil (47) switches the relay switch (42) of the drive motor (2).

Also, relay switch (51) between the power line (H) and ground.
Connect the water flow lamp (49) and the antifreeze lamp (50) via the.
The switch (51) is switched by the relay coils (40) and (48), and the relay coil (4) on the drive circuit (5) side is switched.
The water flow lamp (49) is excited by exciting 8), and the antifreeze lamp is excited by exciting the relay coil (40) on the drive circuit (4) side.
(50) lights up selectively. As a result, the open / closed state of the water drain plug is displayed even when both relay coils are not excited. Furthermore, flip-flops (37), (4
The inverted output of (5) is connected to the base of the transistor (53) through the input negation OR circuit (52) to blink the operation lamp (54) connected to the collector.

On the other hand, the overcurrent detection circuit (6) is the current transformer (61), a buffer amplifier (62) connected to the secondary side, a rectification circuit (63) for converting this output signal into a direct current, and this circuit ( A comparator circuit (65) that compares the output voltage of 63) with the reference voltage (threshold value) set by the variable setter (64) and the reset signal (Sr) based on the result of this comparison is output with a slight delay. Timer circuit
(66), and the output side of this circuit (66) is connected to the reset input of each of the flip-flops (37), (45).

The overcurrent detection circuit (6) functions as follows. now,
When the drive motor (2) is stopped 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 the buffer amplifier (62) and converted into a direct current by the rectifier circuit (63). This DC signal is input to the comparison circuit (65) and the output state is inverted depending on the magnitude of the signal. As a result, the timer circuit (66) is set, the reset signal (Sr) is output after a predetermined time has elapsed, and the flip-flops (37) and (45) are reset.

Next, the overall operation of the water tap control device (M) according to the present invention will be described.

Now, it is assumed that the temperature (air temperature or water temperature) is relatively high and the water drain plug is in the open state. In this case, the output level of the comparison circuit (21) is L (low level), and the output of the NAND circuit (23) is H (high level). On the other hand, when the output of the temperature sensor (2a) falls below the reference voltage of the volume (22) in this state, the output (D ₁ ) of the circuit (21) is inverted as shown in Fig. 3 (a). , That is, H. As a result, the output of the OR circuit (24) becomes H, and the second timer (2
6) is set and time T ₁ (about 2 seconds) shown in Fig. 3 (d)
Is counted and a single pulse (S ₀ ) is output. Therefore,
The output of the NAND circuit (23) becomes L corresponding to the pulse (S ₀ ), and the drive circuit (4), that is, the flip-flop (37)
The input state of is inverted and the output is set to H. As a result, the transistor (38) is turned on and the relay switch (41) is switched. Therefore, an electric current flows in the drive motor (2) in the direction of the arrow (P) to close the water drain plug. Then, when fully closed, the drive motor
(2) stops and overcurrent flows. This change is a current transformer (61)
Then, the reset signal (Sr) is output by the function of the overcurrent detection circuit (6) described above. The flip-flop (37) is reset by this signal (Sr), its output becomes L, the transistor (38) is turned off, and the drive motor (2) is stopped in the closed state. The other drive circuit (5) is not affected by the operation of the drive circuit (4).

Next, in this state, if water is desired to be used, the water flow switch (31) may be turned on. The switch (31) is manually operated, and for example, is released (OFF) by releasing the hand.
As a result, the drive circuit (5), that is, the input (D ₂ ) of the flip-flop (45) becomes as shown in FIG. 3 (b), the state is inverted, and the output becomes H. And a transistor (46)
Turn on and switch the relay switch (42). As a result, a current flows through the motor (2) in the direction of the arrow (Q) to open the water drain plug. Then, when fully opened, the overcurrent due to the stop of the motor (2) is detected and the flip-flop (45) is reset as in the above. Therefore, the drive motor (2) stops in the open state. In this case, the other drive circuit (4) is not affected at all.

Also, the first timer (25) is turned on by turning on the water flow switch (31).
Is set, and after the time T ₂ (about 15 minutes) is counted as shown in FIG. 3 (c), the second timer (26) is set and the single pulse (S ₀ ) is output. At this time, when the temperature is low, the input of the NAND circuit (23) is H, so that the circuit (23) outputs L in response to the pulse (S ₀ ). As a result, similarly to the above, the re-closure drive function of closing the water drain plug is exhibited.

When the temperature is high, the drive circuit (4) is not operated by the NAND circuit (23). Further, the sensor unit (20) and the motor control circuit (1) can be separated from the connection terminals (33) and (34). In this case, the antifreeze switch (30)
The water drain plug can be closed by manually operating the.

Thus, each drive circuit (4), (5) is set independently only when the drive motor (2) is operated, and the motor (2)
Is reset when stops. That is, the motor (2)
When the circuit is in the stopped state, all the circuits (4) and (5) are in the reset state, and the power consumption of the circuit becomes small.

FIG. 4 shows the overall external appearance of the water tap control device (M).
In the figure, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals to clarify the configuration. In FIG. 4, (70) is a motor unit, and the drive motor
(3) and a predetermined reduction gear mechanism are included. (71) is a water drain plug, and the output of the motor unit (70) is valved via the transmission section (72).
It is transmitted to (73) and the valve (73) is raised and lowered to open and close.

Although the embodiments have been described above, the present invention is not limited to such embodiments. For example, each logic or the like can be replaced by a microcomputer or the like that exhibits the same function, and the overcurrent detection circuit can adopt another circuit configuration having the same function. In addition, the detailed circuit configuration, arrangement, time value, parts, etc. can be arbitrarily changed and implemented without departing from the spirit of the present invention.

[Effect of device]

As described above, the water removal control device according to the present invention includes the first and second drive circuits that independently control the opening operation and the closing operation, and detects the overcurrent due to the stop of the drive motor. As a result, the drive circuit is provided with the overcurrent detection circuit section that resets each drive circuit to stop the opening operation and the closing operation, so that the following remarkable effects are obtained.

Generally, the water drain plug is installed outdoors, and the distance between the drive motor and the controller is large. However, since this control device can be housed in the controller away from the drive motor, the conventional limit switch is not required, and problems such as rusting of the limit switch and deterioration due to long-term use are arranged to improve reliability. In addition, a device having high weather resistance can be configured.

Since a mechanical structure that requires responsiveness and position accuracy is not required, it is possible to perform open / close plug control with high responsiveness, high accuracy, and reliably.

Equipped with a drive circuit that has independent flip-flops for opening and closing, and each drive circuit is reset when the motor is stopped, so motor stop control by overcurrent detection can be easily performed when removing the water. This can be realized, the control operation can be stabilized, and the malfunction can be prevented.

When installing this device to existing equipment, the existing motor can be used as is without modification or replacement, contributing to low cost.

[Brief description of drawings]

1 is an electric circuit diagram of a motor control circuit in a water removal control device according to the present invention, FIG. 2 is a block circuit diagram of the water removal control device, and FIG. 3 is a time chart diagram of signals of respective parts in FIG. FIG. 4 is an external configuration diagram of the water tap control device. In the drawing, (M): water drain control device, (2): drive motor (3): drive circuit section, (4): first drive circuit (5): second drive circuit, (6): overcurrent Detection circuit (S ₁ ), (S ₂ ): Set signal, (Sr): Reset signal

Claims (1)

[Scope of utility model registration request] 1. A first flip-flop (37) according to a first set signal (S1) based on the fact that the temperature detected by the temperature sensor (20a) is below a certain value or when the antifreeze switch (30) is turned on.
Turns on, the first drive circuit (4) that closes the plug by operating the drive motor (2) in one direction, and turning on the water flow switch (31)
The second flip-flop (45) is inverted by the second set signal (S2) based on, and the second drive circuit (5) that operates the drive motor (2) in the other direction to open the plug and the drive motor ( By the reset signal (Sr) based on the overcurrent detection at the stop of 2),
Invert each flip-flop (37), (45) to
A water tap control device comprising an overcurrent detection circuit section (6) for stopping (2).