JP2940750B2 - Control device for fountain pump - Google Patents

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 fountain device.

[0002]

2. Description of the Related Art A general fountain device is shown in FIG.
A water tank 1 for storing water for fountain, and a water level switch 2 that is turned on when the water level in the water tank 1 falls below a water level A
A fountain nozzle 3 provided so as to protrude from substantially the center of the water tank 1, a pump 4 for sucking water in the water tank 1 from a suction port 5, and forcing the water to the fountain nozzle 3 for fountain, and a fountain from the fountain nozzle 3. In order to remove fallen leaves or the like from the water, the water tank 1 is arranged so as to close the upper part of the water tank 1, and is constituted by a saucer 6 having a filter function.

As shown in FIG. 2, a control circuit of the fountain device includes a first series circuit 9 in which a relay coil 7 having a normally open contact 8 and a water level switch 2 are connected in series, and A second series circuit 12 in which a pump motor 10 for driving the pump 4, the normally open contact 8, and a thermostat 11 for detecting an abnormal temperature of the pump motor 10 are connected in series to the series circuit 9.

The pump motor 10 has windings 10a, 1
0b, one end of each of the windings 10a and 10b is connected,
This connection point is connected to the normally open contact 8 and the winding 10
The other ends of a and 10b are connected via a capacitor 13,
The connection point between the winding 10a and the capacitor 13 and the thermostat 11 are connected.

[0005] The operation of such a configuration is as follows. When the power is turned on when the water in the water tank 1 is full (water level B higher than water level A in FIG. 1), the water level switch 2 is turned on.
The first series circuit 9 is energized.

At this time, since the relay coil 7 is also energized, the normally open contact 8 is closed and the pump motor 10 is energized. When the pump motor 10 is energized, the pump 4 is driven, and the water in the water tank 1 is fountain from the fountain nozzle 3.

[0007] However, when the water in the water tank 1 evaporates or fountains, the water level drops unless the water returns to the water tank 1 from the receiving tray 6 when the water drops, and the water level A in FIG. It will be lower. When the water level becomes lower than the water level A, the water level switch 2 is turned off, and the power supply to the relay coil 7 is stopped. When energization of the relay coil 7 stops, the normally open contact 8
Is released, the power supply to the pump motor 10 is stopped, and the fountain from the fountain nozzle 3 is stopped.

After that, when the water fountain from the fountain nozzle 3 returns to the water tank 1 via the tray 6 and reaches the water level A or higher, the water level switch 2 is turned on again, the normally open contact 8 is turned on, and the pump motor 10 is driven. To start. When the pump motor 10 is driven, water is sucked from the suction port 5 and the fountain nozzle 3
The fountain is started. However, since the water is drained from the water separating tank 1, the water level drops and falls below the water level A again, the water level switch 2 is turned off, and the driving of the pump motor 10 is stopped.

[0009] By repeating such operations, the normally open and closed contacts are frequently opened and closed, resulting in a shortened contact life and, consequently, a failure of the pump motor 10.

[0010]

In order to solve the above-mentioned problems, a delay timer is provided to suppress the operation of the normally open contact corresponding to the frequent on / off operation of the water level switch. Although there is a possibility of using the method for improvement, these methods not only increase the cost, but also complicate the circuit configuration, and also require the addition of a circuit for protecting the operation of the added circuit.

The present invention is to solve such a problem.

[0012]

A means for solving the problems of the present invention is a water tank in which water in a water tank is fountain from a fountain nozzle by a pump. The water level switch which operates by lowering the water level in the water tank, and the water level switch Are connected in series, a relay coil for selectively switching between a normally open contact and a normally closed contact, and a pump motor connected to the normally closed contact and driving the pump, the water level switch and the relay coil Is connected in parallel with the series circuit of the normally closed contact and the pump motor, and the normally open contact is connected to a connection point between the water level switch and the relay coil.

[0013]

In other words, when the water level in the water tank drops and the water level switch operates, the relay coil connected in series with the water level switch is energized to open the normally closed contact and close the normally open contact. At this time, the energization of the pump motor is stopped, the fountain from the fountain nozzle is stopped, the water level switch is short-circuited due to the closing of the normally open contact, and the relay coil is in a self-holding state. Then, even if the water level in the water tank rises and the water level switch operates, the normally closed contact is not closed because the water level switch is short-circuited, and the pump motor turns off the power until the self-holding state is released. It will not be driven again.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below, but the components having the same reference numerals as those of the structure described in the background art have the same functions, and thus the description thereof will be omitted.

In FIG. 3, reference numeral 14 denotes a contact portion magnetically coupled to the relay coil 7; a movable piece 15 magnetically coupled to the relay coil 7; a normally closed contact 16;
7 is provided. In the contact section 14, the movable piece 15 is connected to the normally closed contact 16 when the relay coil 7 is not energized, and the movable piece 15 is switched to the normally open contact 17 when energized to connect.

The normally closed contact 15 of the contact portion 14 is connected to the pump motor 10, and the normally open contact 17 is connected to a connection point between the water level switch 2 and the relay coil 7.

The operation in such a configuration is as follows. First, when the water level in the water tank 1 is stored up to the water level A in FIG. 1, the water level switch 2 is turned off. The movable piece 15 of the contact portion 14 is connected to the normally closed contact 15 without driving the relay coil 7 to drive the pump motor 10.

However, when the water in the water tank 1 decreases due to evaporation or the like and the water level falls below the water level A, the water level switch 2 is turned on. When the water level switch 2 is turned on, the relay coil 7 is energized, and the movable piece 15 of the contact portion 14 is moved to switch the connection from the normally closed contact 16 to the normally open contact 17. When the connection is switched to the normally open contact 17, the water level switch 2 is short-circuited, and the relay coil 7 is energized via the normally open contact 17, so that a so-called self-holding state is established. At this time, since the normally closed contact 16 is opened, the pump motor 10 is stopped.

Thereafter, even if the water fountain from the fountain nozzle 3 returns to the water tank 1 via the receiving pan 6, and the water level in the water tank 1 becomes higher than the water level A and the water level switch 2 is turned off, the relay coil 7 is still turned on. Since it is held in a self-holding state, the contact portion 1
The fourth movable piece 15 remains connected to the normally open contact 17, and the pump motor 10 is not driven again.

In order to release this state, the power is once turned off and the self-holding state of the relay coil 7 is released.

From the above, once the water level switch 2 is operated, the pump motor 10 cannot operate until the power is turned off, so that the contact portion 14 does not chatter.
It is intended to suppress a decrease in contact life.

[0022]

According to the present invention, once the water level switch is operated, the pump motor is not driven again even if the water level switch is in the state before the operation, so that the normally closed contact or normally open contact is not used. Can be prevented, and a reduction in the life of the contact can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a fountain device.

FIG. 2 is a control circuit diagram of a conventional fountain device.

FIG. 3 is a control circuit diagram of the fountain device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 water tank 2 water level switch 3 fountain nozzle 4 pump 7 relay coil 10 pump motor 16 normally closed contact 17 normally open contact

Claims (1)

(57) [Claims] 1. A water pump in which water in a water tank is fountain from a fountain nozzle by a pump, wherein a water level switch that operates by lowering the water level in the water tank, the water level switch is connected in series, and a normally open contact and a normally closed contact And a pump motor connected to the normally closed contact and driving the pump, and a series circuit of the water level switch and the relay coil includes a relay circuit of the normally closed contact and the pump motor. A control device for a fountain pump, wherein the control unit is connected in parallel with a series circuit, and the normally open contact is connected to a connection point between the water level switch and the relay coil.