JPH07298680A - Control circuit of motor for driving drain tap - Google Patents

Abstract

PURPOSE:To set the tap closing position of a drain tap to the water stopping condition wherein water is just stopped during the season when there is no danger that water freezes and to the drainage condition wherein water in pipes after the drain tap is drained as well as water is stopped during the season when there is a danger that water freezes just by operating a switch. CONSTITUTION:One side of a motor is connected to a source of dc which changes its porality and the other side of the motor is connected to the other side of the source of dc through a normally closed contact Nc1 of a first limit switch and a forward first diode D1. A normally closed contact Nc2 of a second limit switch and a normally closed contact Nc3 of a third limit switch are connected to the other side of the source of dc through a switch S which is switched by external operation and a reverse second diode D2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for a motor for driving a water drain tap of a flush toilet which is used by a large number of unspecified people in cold regions.

[0002]

2. Description of the Related Art Conventionally, in a flush toilet used in an unspecified large number in cold regions, a water drain plug buried in the ground driven by a motor is used. This is because the water stopper that is in a water-removing state by closing the cap rotates the motor by turning on the operation switch from the outside, decelerates by the gear and converts the spindle screwed to the rotating body that meshes with the final gear into a linear motion. When the piston connected to is moved and water flows to the toilet bowl on the ground and it opens, the limit switch shuts off the power to the motor, and the timer reverses the motor after a certain period of time and moves the piston in the opposite direction. Then, when the water is stopped, and the water is further moved by closing the stopper, the motor is cut off by the limit switch, and the water in the pipes to the toilet bowl on the ground after the water stopper is drained to prevent freezing. It was done.

Therefore, the operation is reliable, and there is an advantage that it can be used with confidence even when the water freezes, but on the other hand, the water in the pipe is discharged even when the water does not freeze, which is uneconomical. This is especially the case when the water is discharged into the pipe if the piping is long, but there is a drawback that it takes time until the water comes out. Although it was before the water flowed, some users felt uneasy or mistaken for a toilet failure.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the position where the water stopper is closed is appropriately selected by an operation switch from the outside, and when there is a risk of water freezing, the water is stopped and the inside of the pipe after the water stopper is closed. Water is discharged to stop the motor and stop the motor, and when there is no risk of water freeze The purpose of the present invention is to provide a control circuit for a motor for driving a water drain plug that immediately releases water when there is no season.

[0005]

According to the present invention, one of the DC power supplies whose polarity is changed by an external operation is connected to one of the motors for opening and closing the water drain plug, and the other of the motors is used to detect the state of one of the water drain plugs. The normally-closed contact of the first limit switch and the normally-closed contact of the second limit switch for detecting the other state of the water drain plug while being connected to the other side of the DC power source through the first diode in the forward direction. The normally closed contact of the limit switch of No. 3 is connected to the other of the DC power supply through the switch for switching by an external operation and the second diode in the reverse direction, and the second limit switch and the third switch are operated by an external operation. By changing the limit switch, the closing position of the water drain plug can be selected. When the second limit switch is selected, the second limit switch is If the third limit switch is selected by stopping the motor when the closed contact switches to the normally open contact, the water drain plug will still be driven even if the second limit switch switches from the normally closed contact to the normally open contact, When the limit switch of 3 switches from the normally closed contact to the normally open contact, the circuit is interrupted and the motor is stopped.

[0006]

[Effect] As a result, when the water may freeze, the water is stopped and the water is further moved to drain the water in the pipe after the water tap is set to the closed position, and there is no risk of water freeze. By stopping the water only by stopping the water in the season and not draining it, by closing it, it is economical because it does not drain the water in the season when there is no risk of water freezing.
In addition, the user who comes next will not have to worry about the time when water comes out.

[0007]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which two contacts r of a power relay R, a first limit switch L1, a second limit switch L2, and a third limit switch L3. Also, when the changeover switch S operated from the outside is in the position shown in the drawing, the drive power source Vd drives the motor M.
A drive current does not flow through the water drainage valve V, and the water drain plug V is stopped in a closed state. The limit switches L1, L2 and L3 for detecting the state of the water stopper V having a piston which is moved by the rotating motor M have hinge levers and rotate with the water stopper V driven by the rotation of the motor M while coming into contact with the hinge levers. Due to the disc-shaped detector that has a convex part with a part of the width, the limit switch has a normally closed contact when the convex part of the detector is away from the hinge lever, and the limit switch when the convex part pushes the hinge lever. Is at the normally open contact. At the position shown in the drawing, the hinge lever of the first limit switch L1 is away from the convex portion and the normally closed contact Nc1, and the second limit switch L2 is the normally open contact No2 of which the hinge lever is pushed and the third limit switch L3. Is located at the normally closed contact Nc3 with the hinge lever separated from the convex portion.

The transistor T for energizing the power relay R is at the output of the flip-flop F,
Is composed of two NANDs, the output of the NAND on the side where the input becomes 0 is 1 and the output remains 1 even if the input returns to 1,
The output of NAND on the other side is zero. Flip flop F
One of the inputs is connected to the output of the closing gate PG whose input is the operation switch P, and the capacitor Ci at the input of the inverter, together with the resistance connected to it, prevents noise generated when the operation switch P is turned on and off. Is. When the operation switch P is pressed, one input of the OR via the resistor becomes 0, and the output capacitor Co is charged through the resistor of the output of the inverter, but the other input of the OR is input for a predetermined time during that period. Is set to 0, so that the output of OR becomes 0 for a predetermined time, and it returns to 1 even if it is pressed further. When the output of the flip-flop F is inverted from 0 to 1, the power relay R is energized via the transistor T and at the same time the timer TM is started. Timer TM
Then, the capacitor Ct is charged via the resistor, and the output of the inverter is inverted to 0 after a certain period of time elapses. As a result, the other input of the flip-flop F becomes 0,
The output of the flip-flop F is reset to 0, and the drive relay R is deenergized via the transistor T, while the timer T
The charged capacitor Ct at the input of M is rapidly discharged through the diode, and the output of the timer TM is returned to 1. It is sufficient that the time constant of the closing gate capacitor Co and the resistance is longer than the time for setting the output of the flip-flop F to 1.

When the changeover switch S operated from the outside is in the position shown in the figure and the input of the flip-flop F via the closing gate PG is 1 and the output is 0, the power relay R via the transistor T is attached. It is not energized, the contact r of the power relay R is in the position shown in the figure, and the hinge lever is not pushed in the first limit switch L1 and the third limit switch L3, and the normally closed contacts Nc1 and Nc3 side are shown. , In the second limit switch L2, when the convex portion of the detection body pushes the hinge lever and is on the normally open contact No2 side in the figure, the driving current does not flow from the driving power source Vd to the motor M, and the water drain plug V is stopped. It is stopped with the stopper closed. When the operation switch P is pressed from this state, the water draining plug V is opened in the following manner, and after a lapse of a certain time, it returns to the original water-stopping closed state and stops.

That is, when the operation switch P is turned on, the output of the closing gate PG becomes 0 for a predetermined time. As a result, the output of the flip-flop F is inverted to 1, and a current flows from the control power supply Vc to the power supply relay R via the transistor T to energize the power supply relay R, while the timer TM
To start. The contact r is switched from the position shown in the figure to the other end by energization of the power supply relay R, and the direction of the arrow is changed from the drive power supply Vd to the motor M, the normally closed contact Nc1 of the first limit switch L1 and the first diode D1. An electric current for driving the motor M flows to drive the water removing plug V in the opening direction. When the water stopper V starts to be driven in the opening direction, the detector starts rotating accordingly, and the second limit switch L
In 2, the convex portion of the detection body leaves the hinge lever and switches from the position shown in the figure to the normally closed contact Nc2 at the other end, but the drive current continues to flow through the motor M, the drain tap V opens, and water is flushed in the toilet bowl. It begins to flow. In the first limit switch L1 that detects the position when the water drain V is fully opened, the hinge lever is pushed by the convex portion of the detection body and switches from the normally closed contact Nc1 in the figure to the normally open contact No1 at the other end to drive current. Then, the motor M is stopped, the drain tap V is opened, and sufficient water flows into the toilet bowl. When the capacitor Ct of the timer TM is charged after a certain period of time, the timer T is passed through the inverter.
When the output of M becomes 0 and the output of the flip-flop F returns from 1 to 0, the charged capacitor Ct is rapidly discharged by the diode, while the energization of the power relay R via the transistor T is cut off. The contact point r returns to the position shown in the figure. By the restoration of the contact r of the power relay R, the drive power Vd is connected to the motor M via the second diode D2, the position change switch S in the figure, and the normally closed contact Nc2 of the second limit switch L2 switched from the position in the figure. Drive current flows in the direction opposite to the arrow in the figure, and drives the water drain plug V in the closing direction. When the drain plug V starts to be driven in the closing direction, the normally open contact No1 pressed by the first limit switch L1 returns to the normally closed contact Nc1 shown in the figure, but the drive current continues to flow through the motor M and the drain plug V closes. When the water stopper V is stopped, the hinge lever of the second limit switch L2 is pressed to return to the normally open contact No2 in the figure, the drive current is lost, the motor M is stopped, and the water stopper V is closed. After returning to the state, the water flowing in the toilet stopped.

As described above, when the operation switch P is pushed while the changeover switch S is at the position shown in the figure, the water drain plug V is opened and water is flown into the toilet bowl, and after a certain period of time the water stop plug is closed. Return to the state.

When the changeover switch S is switched to the other end while the water draining plug V is in the water-stopped state, the motor M is connected to the contact r of the power supply relay from the drive power supply Vd, the second diode D2, and the other end of the figure. A drive current flows in the direction opposite to the arrow in the drawing through the changeover switch S of No. 3 and the normally closed contact Nc3 of the third limit switch L3, and drives the water drain plug V further in the plug closing direction. While the hinge lever of the second limit switch L2 is pressed to return to the normally open contact No2 shown in the figure, the drain plug V
When is drained, the third limit switch L3 also pushes the hinge lever to switch from the position in the figure to the normally open contact No3 at the other end, the drive current disappears, the motor M stops, and the drain plug V is in the drain closed state. Then, the water stored in the pipe between the water tap V and the toilet bowl is discharged.

When the operation switch P is pressed from the drainage plugged state, the water drainage plug V is opened in the following manner, and after a certain period of time, the drainage plugged state is restored and stopped.

That is, when the operation switch P is turned on, the output of the closing gate PG becomes 0 for a predetermined time, the output of the flip-flop F is inverted to 1, and the power supply relay R is energized via the transistor T and the timer is set. Start TM. The contact r is switched from the position shown in the figure to the other end by energization of the power supply relay R, and the direction of the arrow is changed from the drive power supply Vd to the motor M, the normally closed contact Nc1 of the first limit switch L1 and the first diode D1. An electric current for driving the motor M flows to drive the water removing plug V in the opening direction. When the water drain V is driven in the opening direction, the convex portion of the third limit switch L3 leaves the hinge lever to become the normally closed contact Nc3 at the position shown in the figure, but the drive current continues to flow to the motor M to cause water to flow. The stopper V is driven in the opening direction. Immediately before the water stopper V is driven and the convex portion leaves the hinge lever by the second limit switch L2, the water-stopping state is the state of the water-stopping stopper described above, and beyond that, the contact is switched to the normally closed contact Nc2 at the other end of the figure. Drive current continues to flow through the motor M, and the water drain plug V
Is further driven in the opening direction, and water begins to flow. In the first limit switch L1 that detects the position when the water drain V is fully opened, the hinge lever is pushed by the convex portion of the detection body and switches from the normally closed contact Nc1 in the figure to the normally open contact No1 at the other end to drive current. Then, the motor M is stopped and the water stopper V is opened to allow sufficient water to flow into the toilet bowl. When the output of the timer TM becomes 0 and the output of the flip-flop F returns from 1 to 0 after a certain period of time, the transistor T
The bias of the power supply relay R is hung through the contact point r to return the contact point r to the position shown in the figure. By the restoration of the contact r of the power relay R, the drive power source Vd to the second diode D2, the changeover switch S at the other end of the figure, and the third limit switch L at the position of the figure
A drive current in the direction opposite to the arrow in the figure flows through the motor M through the normally closed contact Nc3 of No. 3, and drives the water drain plug V in the closing direction. When the water drain V starts to drive in the closing direction, the first limit switch L1 is restored from the normally open contact No1 that was being pressed to the normally closed contact Nc1 in the figure, but the drive current continues to flow to the motor M. When the water drain V is driven in the closing direction and the amount of water flowing to the toilet bowl decreases and finally the water stops, the hinge lever of the second limit switch L2 for detecting the state is pushed to the normally open contact No2 in the figure. Although it returns, the drive current continues to flow as before and drives the water drain plug V further in the closing direction. When the water drain plug V is further driven to drain water while the hinge lever of the second limit switch L2 is being pressed, the hinge lever of the third limit switch L3 is pressed by the convex portion of the detection body to the normally open contact No3. After switching, the drive current of the motor M is cut off, and the water drain plug V returns to the drainage closed state and stops.

As described above, when the operation switch P is pushed while the changeover switch S is at the other end of the drawing, the water drain plug V is opened, and after a certain period of time, the drain water is closed again. Stop. Even if the changeover switch S is returned to the position shown in the figure with the drain plug V being closed with drainage, the motor M
Drive current does not flow to. When the operation switch P is pressed from this state, the contact r of the power relay R switches to the other end of the figure, and the normally closed contact Nc of the first limit switch at the position of the figure.
A drive current in the direction of the arrow in the drawing flows to the motor M via the first diode D1 and the first limit switch L3.
Is from the normally open contact No3 at the other end of the figure to the normally closed contact N at the position of the figure
Returning to c3, the second limit switch L2 switches from the normally open contact No2 at the position shown to the normally closed contact Nc2 at the other end, and the first limit switch L1 switches from the position shown to the normally open contact No1 at the other end. When the drive current of the motor M is lost and the water drain V is opened, and after a certain time, the power relay R is de-energized and the contact r is returned to the position shown in the figure, the motor M receives the second A driving current flows through the diode D2, the position changeover switch S in the drawing, and the normally closed contact Nc2 of the second limit switch L2 at the other end of the drawing to drive the water drain plug V in the closing direction, and the first limit switch. L
When 1 is returned to the normally closed contact Nc1 in the figure and the second limit switch L2 is returned to the normally open contact No2 in the figure, the drive current is lost and the water drain plug V is in a closed state and stopped. All the contacts return to the position shown in the figure, and the operation is performed when the changeover switch S described above is in the position shown in the figure.

In the above description, the operation switch P is adopted as the input of the closing gate PG, but the input is not limited thereto. For example, instead of the operation switch P, a photoelectric switch for detecting the presence / absence of a person is adopted, and if 1 is input when there is a person and 0 is input when there is no person, the input gate PG of the input gate PG is used when there is no person. The output OR becomes 0 for a predetermined time, the flip-flop F is inverted, the power relay R is energized, and the water drain plug V is driven in the opening direction. In this case, when there is no person, the charged capacitor Co is discharged when a person comes and starts to be charged when there is no person. However, when the capacitor Co is fully discharged and starts to be charged, the output of OR becomes 0 for a predetermined time. Therefore, the capacitor C
If o is not sufficiently discharged, the output of OR will not become 0,
The flip-flop F is not inverted. In other words, the flip-flop F is not
Is reversed and the power relay R is energized, the water draining plug V is driven in the opening direction, and the closing gate PG does not operate for a person who simply passes the detection range of the photoelectric switch.
The water stopper V is never driven in the opening direction.

Although the changeover switch S is operated by a human, a temperature switch is used to switch to the position shown in the figure when the water is not frozen and to the other end when the water is frozen. Of course it doesn't matter.

[0018]

As described above, according to the present invention, the closing position of the water drain plug can be selected by an operation from the outside, whereby the water can be removed at a time when water may freeze. The closed position is the drainage state where the water inside the pipe is drained after the water is stopped even after the water is stopped, and the stopped state where the water is stopped but not drained when there is no risk of freezing the water. By doing so, it is economical because the water is not drained but drained only in the season when there is no fear of water freezing, and the next user does not have to worry about the time when water comes out. It has an effect.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 Vc control power supply Vd drive power supply M motor V drain plug D1 first diode D2 second diode S changeover switch L1 first limit switch L2 second limit switch L3 third limit switch No1 first limit switch always Open contact Nc1 Normally closed contact of first limit switch No2 Normally opened contact of second limit switch Nc2 Normally closed contact of second limit switch No3 Normally opened contact of third limit switch Nc3 Normally closed contact of third limit switch Closed contact R Power supply relay r Power supply relay contact PG Input gate P Operation switch TM Timer F Flip-flop T Transistor Ci, Co, Ct Capacitor

Claims (1)

[Claims] 1. A first limit switch for detecting the state of one of the water drain plugs is connected to one of a DC power source whose polarity is changed by an external operation and one of the motors for opening and closing the water drain plug. While connecting to the other side of the DC power supply via the closed contact and the first diode in the forward direction,
A normally closed contact of the second limit switch and a normally closed contact of the third limit switch for detecting the other state of the water drain plug,
A control circuit for a water tap drive motor, characterized in that it is connected to the other of the DC power supply via a switch that is switched by an external operation and a second diode in the opposite direction.