JPS6322447Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to ventilation fans used in toilets and the like.

BACKGROUND OF THE INVENTION Generally, ventilation fans used in toilets and the like are preferably operated for a certain period of time in order to expel residual odors after the toilet is used.

For this reason, conventional ventilation fans for toilets connect a series circuit of a switch 101 and a thermal timer 102 to a power supply 100, as shown in FIGS.
The ventilation fan 104 is operated and controlled by opening and closing the ventilation fan 104, and is usually installed along with a switchbox 105 on the wall of a toilet entrance.

In the toilet ventilation fan mentioned above, when the switch 101 is turned on, the thermal timer 102 starts operating.
The contact 103 is turned on and the ventilation fan 104 turns. On the other hand, when the switch 101 is turned off, the contact 103 remains closed for a while, so the ventilation fan 104 operates on a delay timer.

In a toilet, etc., by turning on the switch 101 before use and turning off the switch 101 after use, residual odors can be discharged.

Problems that the invention aims to solve: However, in this case, due to the characteristics of the thermal timer 102, the timer time is only about 3 minutes, and in order to efficiently remove residual odors, a ventilation fan with a large exhaust air volume is required. had undesirable drawbacks.

In addition, switch box 105 and switch 10
1 and the thermal timer 102, the wiring is complicated, which is a disadvantage in terms of construction.

The present invention takes into consideration the above-mentioned conventional drawbacks and aims to provide a timer ventilation fan for toilets that has improved operability of operation control and easy wiring work.

Means for Solving the Problems In order to achieve the above object, the present invention includes a push switch that is manually activated and has a normally closed contact that opens an electric circuit, and a first relay that is deactivated by the push switch. a second relay coil operated by a first relay switch having a normally closed contact actuated by the first relay coil; and a second relay coil having a normally open contact actuated by the second relay coil. The fan motor of the ventilation fan is operated by a relay switch, and a timer is provided to open the second relay switch a certain period of time after the first relay switch is closed. .

Function: With the timer ventilation fan, when the push switch is pressed, the relay switch and timer operate to operate the fan motor of the ventilation fan for a certain period of time and then stop the fan motor.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In the figure, 1 is a power supply, 2 is a push switch as a manual switch installed on the wall, and is a normally closed type.
It is inserted into the power supply circuit of the power source 1, and when pressed, the contacts open, and when the hand is removed, the contacts return to their original positions and close.

The ventilation fan main body 25 has a control circuit 26, and the control circuit 26 is connected to a power supply circuit including the push switch 2 through a wall outlet 27.

The control circuit 26 includes a first relay coil 5 and a second relay 6 connected to a power source.
A second relay switch 23, which is closed by the operation of the relay coil 6, is inserted into the energizing circuit of the fan motor 24. The first normally closed relay switch 22, which is closed by the operation of the first relay coil 5, is connected to the second relay switch 23.
It is inserted into a short circuit with diodes 8 and 9 connected in parallel to the relay coil 6, that is, into a current-carrying circuit of the second relay coil 6.

A resistor 3 and a rectifying diode 7 are connected in series to the first relay coil 5, and a capacitor 11 is connected in parallel.

Further, a capacitor 12 is connected in parallel to the second relay coil 6.

A timer circuit consisting of a resistor 13 and a capacitor 14 is provided after the second relay switch 23, and the charging side end of the capacitor 14 is connected to the gate of a field effect transistor 15 (hereinafter referred to as FET). . The source of the FET 15 is connected to the voltage dividing point of the resistors 16 and 17, and the drain is connected to the base of the transistor 18.

In addition, 4, 20, 19 in the figure are circuit resistances, 21
is a discharge resistor, and 10 is a rectifier diode. Furthermore, of the capacitors 11 and 12, the capacitance of the capacitor 11 is set to a larger value.

In FIG. 6, 28 is the first relay coil 5.
29 is the change in voltage across the second relay coil 6.
30 shows the change in the output of the outlet 27 which is turned on and off by the push switch 2. 31 is the first relay coil 5
The point at which the first relay switch 22 closes, 3
2 is the point at which the second relay switch 23 is closed by the second relay coil 6, 33 is the point at which the first relay switch 22 is reopened by the first relay coil 5, and 34 is the contact point from when the push switch 2 is pressed until it is released. During the time T ₁ , 35 when the button is open, the push switch 2 is open and the first relay switch 2 is open.
2 is closed, ₃₆ is the time T ₅ from when the first relay switch 22 is closed until the second relay switch 23 is closed, and 37 is the time when the push switch 2 is closed again and the first relay switch 2 is closed.
2 is opened again _T4 .

In the above configuration, when the push switch 2 is pressed, the power is cut off momentarily, but the charge in the capacitor 11 flows to the first relay coil 5, and the first relay switch 22, which has been open until now, is turned off as shown in FIG. is closed, and current flows through the resistor 4, the relay coil 6, the diodes 8 and 9, and the first relay switch 22. Since current flows through the second relay coil 6, the second relay switch 23
closes. Thereafter, the first relay switch 22 is opened again, but since the current flows through the diode 10 and the second relay switch 23, the current flows through the second relay coil 6 one after another.

At the same time, current also flows through the resistor 13 and capacitor 14 of the timer circuit, so that the terminal voltage of the capacitor 14 increases. When the voltage of the capacitor 14 approaches the voltage divided by the resistors 16 and 17,
FET15 starts to operate and current flows to the drain.
Transistor 18 operates, current flows through the collector, so instantaneous current flows through resistor 19, the terminal voltage of second relay coil 6 decreases, second relay coil 6 becomes inactive, and second relay switch 2
3 opens, the self-retention of the second relay coil 6 is released, and the fan motor 24 of the ventilation fan stops.

At this time, if the resistor 13 and capacitor 14 are made larger, the time constant becomes larger and the timer time can be made longer.

Effects of the invention As described above, according to the invention, a ventilation fan is installed in a toilet, etc., a push switch is attached to the wall of the entrance of the toilet, and when the push switch is pressed after using the toilet, the ventilation fan operates for a certain period of time and then stops. This has the advantage that residual odors can be removed, and there is no need to turn the switch on and off, eliminating the waste of continued operation.

Additionally, the electrical wiring can be easily done with two wires as shown in the diagram, making it possible to replace the existing toilet ventilation fan switch.

[Brief explanation of the drawing]

Figure 1 is an electrical circuit diagram of a conventional timer ventilation fan.
Figure 2 is an electric circuit diagram of another similar one, Figure 3 is an electric circuit diagram of a timer ventilation fan according to an embodiment of the present invention, Figure 4 is a connection diagram of the same timer ventilation fan, and Figure 5 is an example of construction of the same timer ventilation fan. FIG. 6 is a time chart of the relay coil and push switch. 2... Push switch, 5... First relay coil, 6... Second relay coil, 11, 12
... Capacitor, 22 ... First relay switch (normally closed contact), 23 ... Second relay switch (normally open contact), 24 ... Fan motor of ventilation fan.

Claims (1)

[Scope of utility model registration request] a push switch with a normally closed contact that is manually operated to open an electric circuit; a first relay coil that is deenergized by the push switch; and a first relay coil that has a normally closed contact that is operated by the first relay coil. A second relay coil that starts energization by a relay switch, and a fan motor for a ventilation fan that starts energization by a second relay switch having a normally open contact operated by the second relay coil. Set the relay switch to 1st
A timer ventilation fan that has a timer that opens after a certain period of time after the relay switch closes and opens.