JPH0325232A - Air volume displaying device for ventilation fan - Google Patents

Abstract

PURPOSE:To set one display lamp and enable a variation of displaying state to be easily acknowledged by a method wherein a flashing signal is outputted to a display lamp during an operation of a ventilation fan and a lighting time of each of the periods of the flashing signal is varied in response to the volume of ventilation air. CONSTITUTION:An electric motor 13 is composed of a low operation tap 13a, a medium operation tap 13b and a high operation tap 13c. It has bidirectional thyristors 20 to 22 connected to these taps 13a to 13c and then it is connected to an AC power supply 19 through these thyristors. A control circuit 23 connected to the AC power supply 19 has a changing-over switch 24 operated by a string 17 and a display lamp 16. During operation, the control circuit 23 may send out an flashing signal having a period T, a lighting time Ton and a diminishing time Toff so as to flash the display lamp 16. At this time, as the operation is increased from the low operation, medium operation and high operation to increase an amount of air, the lighting time Ton is extended with the period T being kept constant and the flashing signal having different duty ratio is sent out. With such an arrangement, it is possible to confirm a volume of ventilation at a glance of one display lamp.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device that displays the ventilation air volume of a ventilation fan. [Prior Art] FIG. 5 is a circuit diagram showing a conventional ventilation fan air volume display device disclosed in, for example, Japanese Utility Model Application Publication No. 55-135222. In the figure, (1) is the S coil of the motor, (2) is the M coil, and one end of the S coil (1) and the M coil (2) are both connected to an AC power source. (3) is both coils (1)
The capacitor connected to the other end of (2), (4) is a changeover switch, which includes a common terminal (4a), a sliding terminal (4b), a weak operation terminal (4c), a strong operation terminal (4d), and an off terminal ( 4e
) and a sliding piece (4f) that contacts these terminals (4c) to (4e), and the common terminal (4a) is connected to an AC power source. (5) is a weak operation indicator light, (6) is a strong operation indicator light, and one end of the weak operation indicator light (5) is a weak operation terminal (4d
), one end of the strong operation indicator light (6) is connected to the weak operation terminal (4c).
The other ends of both indicator lights (5) and (6) are connected to the sliding terminals (
The conventional ventilation fan air volume display device connected to 4b) is constructed as described above,
The sliding piece (4f) is connected to the weak operation terminal (4c) or the strong operation terminal (
By touching 4d), the rotational speed of the electric motor, that is, the air volume is switched. When the slider (4f) contacts the weak operation terminal (4c), the strong operation indicator light (6)
is short-circuited by the sliding piece (4f), so it goes out, and the weak operation indicator light (5) lights up. When the sliding piece (4f) contacts the strong operation terminal (4d), the weak operation indicator light (5)
f), the light goes out and the strong operation indicator light (6)
lights up and a display corresponding to the ventilation air volume is displayed.

[Problems to be Solved by the Invention] In the conventional ventilation fan air volume display device as described above, indicator lights (5) and (6) are connected to the changeover contacts (4c) and (4d) of the changeover switch (4>), respectively. Therefore, it is necessary to install as many indicator lights (5) and (6) as can be switched, which increases the number of indicator lights (5) and (6), and requires a large space to install them. There is a point.
In addition, if the installation location of the ventilation fan is dark or far away, even if you can confirm that the indicator lights (5) and (6) are lit, the indicator lights will indicate which operating state the ventilation fan is in. There is a problem that characters, signals, etc. cannot be identified.

This invention was made to solve the above problems, and allows the ventilation air volume to be displayed with just one indicator light, and the ventilation air volume can be confirmed at a glance even if the characters, signals, etc. indicating the ventilation air volume are not visible. The purpose of this invention is to provide a ventilation fan airflow display device that allows [Means for Solving the Problems] The ventilation fan air volume display device according to the present invention sends a blinking signal to the indicator light while the ventilation fan is operating, and changes the lighting time of each cycle of this blinking signal depending on the ventilation air volume. It was designed so that

[Function] In this invention, the indicator light is made to blink, and the lighting time of each cycle of blinking is changed according to the ventilation air volume, so that only 1±1 indicator light is required, and the display form does not change. Easily Distinguished Example [Embodiment] Figures 1 to 4 are diagrams showing an example of the present invention.
FIG. 2 is a front view of the ventilation fan, FIG. 2 is a circuit diagram, FIG. 3 is a waveform diagram of a blinking signal, and FIG. 4 is an explanatory diagram of the relationship between ventilation air volume and duty ratio of the blinking signal.

In Fig. 1, (11) is a decorative panel in which the main body (12) is housed, and inside the main body (02) is an electric motor (13) and a blade (14).
) is provided. (Work 5) is an oil pan installed at the bottom of the decorative panel (1l), and the air volume indicator light (16)
is provided. (17) is the string for changing the ventilation air volume, and (18) is the power cord. In Fig. 2, (l9) is an AC power supply, and the electric motor (13) has a weak operation tap (13a), a medium operation tap (13b), and a strong operation tap (13c).
) to (13c) bidirectional thyristor (20) connected to
- (22) are connected to an AC power source (19). (23) is a control circuit connected to an AC power source (19), to which a changeover switch (24) operated by a string (17) and an indicator light (16) are connected.

Next, the operation of this embodiment will be explained. When the operation is stopped, pull the string (17) to switch on the selector switch (24).
), the control circuit (23) turns on the bidirectional thyristor (20) connected to the weak operation tap (13a), and the operating state becomes weak operation with a small ventilation air volume. Next, when the changeover switch (24) is operated, the bidirectional thyristor (20) is turned off, and the bidirectional thyristor (21) connected to the medium operation tap (13b) is turned on, so that the operating state is less than weak operation and ventilation. It will be operated in high wind volume. Furthermore, when the changeover switch (24) is operated, the bidirectional thyristor (2
1) is turned off, the bidirectional thyristor (22) connected to the strong operation tap (13c) is turned on, the operating state becomes strong operation, and the ventilation air volume becomes maximum. Furthermore, selector switch (2
Operation will stop if you operate 4). On the other hand, the running control circuit (23) sends out a blinking signal having a cycle T, a lighting time Ton, and a lights-off time Toff, as shown in FIG. 3, to cause the indicator light (16) to blink. here,
As the ventilation air volume increases during weak, medium and strong operation,
While the period T remains constant, the lighting time Ton is increased, and blinking signals with different duty ratios are sent out. Now you can check the ventilation air volume at a glance.

Figure 4 shows the relationship between the ventilation air volume and the duty ratio of the blinking signal. Further, in the above embodiment, a ventilation fan has been described, but it can also be applied to a range hood, and can perform the same function as the above embodiment. [Effects of the Invention] As explained above, in this invention, a blinking signal is sent to the indicator light while the ventilation fan is operating, and the lighting time of each cycle of this blinking signal is changed according to the ventilation air volume. Only one light is needed, and the display part can be constructed at low cost. In addition, changes in the display format can be easily identified, and the ventilation air volume can be confirmed at a glance.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing an embodiment of the ventilation fan air volume display device according to the present invention, and the first construction drawing is a front view of the ventilation fan, and the second construction drawing is a front view of the ventilation fan.
The figure is a circuit diagram, Figure 3 is a waveform diagram of a blinking signal, Figure 4 is an explanatory diagram of the relationship between ventilation air volume and the duty ratio of the blinking signal, and Figure 5 is a circuit diagram showing a conventional ventilation fan air volume display device. .

Claims (1)

[Claims] The device that displays the ventilation air volume of the ventilation fan with an indicator light while the ventilation fan is operating is equipped with a control circuit that sends a blinking signal to the indicator light while the ventilation fan is operating, and the lighting time of each cycle of the blinking signal is set to the ventilation air volume. An air volume display device for a ventilation fan, characterized in that the air volume is changed according to the air flow rate.