JPH02254986A - Valve motor controller - Google Patents

Abstract

PURPOSE:To facilitate operations by opening and closing a water valve by driving of a motor using electric switches. CONSTITUTION:A dc motor 2 for valve opening and closing is connected to the axis of a water valve 7 and switches 3-6 to change the direction of an input current sent to said motor 2 are installed to open, close, and stop the water valve 7. The interlocking switches 3 and 4 are connected to a dc power source 1. In stopping the motor, the switches 3-6 are used to cut off the paths from the power source 1 and, at the same time, opened and closed to short- circuit the terminals of the motor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a valve motor used in a water heater such as a gas instantaneous water heater.

Conventional technology In conventional gas instantaneous water heaters, water is supplied to the heat exchanger by manually pressing an operation button provided on the water heater to mechanically open and close a water flow valve provided in the inlet channel. It was carried out by

Problems to be Solved by the Invention However, since the water flow valve is opened by manual pressure, it is difficult to operate and is particularly difficult and inconvenient for women and elderly people. In addition, since the water valve is opened and closed in a short period of time, a water hammer phenomenon occurs, particularly right after the water valve is closed, which generates noise and causes discomfort during operation.

Means for Solving the Problems In order to achieve the above object, the present invention includes a valve that controls a flow path, a DC motor that opens and closes this valve, a direction of current to the DC motor, and a valve that controls the current direction of the DC motor. four switches whose operating positions are combined so as to cause rotation and reversal to occur, and to cut off current from the power source to the DC motor and simultaneously short-circuit the terminals of the DC motor when each operation is stopped; It is equipped with the following.

Operation With the above structure, the valve can be opened by an electric switch instead of being opened by manual pressure as in the conventional case.

Further, since the opening and closing of the through valve is performed by motor drive, it takes a certain amount of time (about 1 to 3 seconds) to open and close the valve, and the valve is gradually opened and closed.

Furthermore, when the motor is stopped, the switch cuts off the path from the power supply and at the same time shorts the terminals of the DC motor, so the inertial energy of the motor is consumed in a short time and there is no overrun.

Example Embodiments of the present invention will be described using the drawings.

FIG. 1 shows a block diagram of the present invention, in which a DC motor 2 for opening and closing the valve is connected to the shaft of a zero water flow valve 7.

Additionally, switches 3, 4, and 5.6 are provided to change the direction of input current to the DC motor in order to open, close, and stop the water valve.

Here switch 3 (SWI) and switch 4 (SW2
) are designed to work together. switch 3゜4.5
．． 6 is connected to a DC power supply 1 for supplying power to the DC motor 2.

The operation will be explained in detail below.

Figure 2 is initial state 1! This shows the operating position of the switch (when the water valve is closed). The switch 3 is in contact with the BL contact, the switch 4 is in contact with the bt contact, the switch 5 is in contact with the inlet, and the switch 6 is in contact with the a contact.

Therefore, a closed loop shown by a broken line is formed, and both ends of the DC motor 2 are short-circuited, and the DC motor 2 is cut off from the DC power supply 1.

Next, switch 3 and switch 4, which are interlocking switches.
When the valve 7 is operated, the normal rotation operation starts as shown in FIG. 3, and the water flow valve 7 starts to open.

At this time, it is just before it is about to move, and switch 3.4
maintains its previous state. Therefore, a closed loop as shown by the broken line is formed, and the positive voltage E of the DC power source 1 is applied to the child terminal of the DC motor 2, and the motor attempts to rotate in the forward rotation direction. Then, the water valve 7 is about to be opened. When the DC motor 2 rotates slightly in the forward rotation direction, the switch 6 is connected to the b4 contact (break contact) by a cam (not shown). The state at this time is shown in FIG. Switch 5 remains in its previous state and is connected to contact b3. Therefore, the closed loop shown by the broken line continues, and the DC motor 2 continues to rotate in the forward rotation direction. When the water valve 7 is rotated by a certain angle, the water valve 7 is completely opened. At the same time, the switch 5 is connected to contact a (part-time contact) by the cam, resulting in the state shown in FIG.

Therefore, the DC power source 1 is cut off, and both ends of the DC motor 2 are short-circuited in the closed loop shown by the broken line in the figure.

The motor quickly discharges energy and comes to an abrupt stop. The water valve 7 continues to remain completely open.

The operation of closing the water flow valve 7 will be explained as follows.

When the interlocking switches 3 and 4 are returned to their initial states, switch 3 becomes the b+ contact, switch 4 becomes the b+ contact,
Connected to the contacts. At this time, switch 5. The switch 6 remains in its previous state and is connected to the a, contact, and b4 contacts, respectively. However, as shown in FIG. 6, a closed loop indicated by a broken line is formed, and the positive voltage E of the DC power source 1 is applied to the e terminal of the DC motor 2.

will be applied. Then, the DC motor 2 begins to rotate in the opposite direction, and the water passage valve 7 starts to close. When it rotates slightly in the opposite direction, the cam closes the switch 5 and connects it to the contact point.

The state is shown in FIG. At this time, the switch 6 continues to be connected to the b4 contact point, so the DC motor 2 continues to rotate in the reverse direction, the water flow valve 7 performs the closing operation, and the valve 7 is gradually closed.

When the water valve 7 is rotated by a certain angle, the water valve 7 is completely closed. At the same time, the switch 6 is connected to the A4 contact (part-time contact) by the cam, resulting in the state shown in FIG. Therefore, the DC power source 1 is cut off, and both ends of the DC motor 2 are short-circuited in the closed loop shown by the broken line in the figure. The DC motor 2 rapidly discharges energy and suddenly stops. The water flow valve 7 continues to remain completely closed. The state shown in FIG. 8 is the same as the initial state shown in FIG. 1, and the water flow valve 7 is opened and closed by this series of sequences.

Effects of the Invention As described above, according to the present invention, the water flow valve can be opened with an electric switch instead of being opened by manual pressure unlike conventional water flow valves, which is convenient and easy to operate.

Furthermore, since the water flow valve is opened and closed by motor drive, the valve is opened and closed gradually, so that no water hammer phenomenon occurs and no unpleasant noise is generated.

Furthermore, when the motor is stopped, the switch cuts off the path from the power supply and at the same time shorts the terminals of the DC motor, allowing the inertial energy of the motor to be instantly discharged, making it possible to stop the motor suddenly and stop it at the target position. be able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of a control device for a valve motor according to the present invention, and FIGS. 2 to 8 are operation sequence diagrams of the same control device. 1...DC power supply, 2...Motor, 3.
4,5゜6...Switch, 7...Water valve. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] A valve for controlling a flow path, a DC motor used to open and close the valve, and switching the direction of current to the DC motor,
Each switch is configured to cause the DC motor to perform normal rotation operation and reverse rotation operation, and to cut off the current from the power source to the DC motor and short-circuit the terminals of the DC motor when each operation is stopped. A valve motor control device equipped with four switches with combinations of operating positions.