JPS63176942A - Ventilation fan - Google Patents

Abstract

PURPOSE:To steadily and stably attain a good ventilating performance by detecting the displacement of an air pressure-dependent movable body disposed in an air duct in the unit and outputting the displacement signal, based on which the motor output is controlled to obtain the desired ventilation air flow. CONSTITUTION:When the shutter 11 is rotated to a first angular position at which a first lead switch 14 is situated, a magnet 13 comes close to the lead switch 14 to close the same, sensing the position, and the first position detection signal S1 is outputted from a signal outputting circuit 16. By being inputted with the first position detection signal S1 while in the absence of any input of the second position detection signals S2, a control circuit 18 outputs a control signal Ss to maintain the output of a motor 15 in existing conditions. Therefore, the rotational angle of the shutter 11 is held at such as angle to generate a proper ventilating air flow rate. As the control circuit 18 raises the output of the motor 5 until the shutter 11 is brought to a proper rotational angle, the proper ventilating air flow rate is always attained if the ventilation resistance is high or low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a ventilation fan that controls ventilation air volume.

(Prior art) Conventionally, a ventilation fan has a configuration in which a ventilation device consisting of ventilation blades and a motor that rotationally drives the ventilation fan is installed in the main body. The side is connected to the outside through an exhaust duct or the like. In conventional ventilation fans, the motor is operated at a constant output to rotate the blower blades, thereby discharging indoor air to the outdoors.

(Problem to be Solved by the Invention) By the way, ventilation resistance, which is the resistance to the air blowing device of a ventilation fan, depends on the structure of the house, such as the degree of sealing of the room, the length of the exhaust duct, and the direction and speed of the wind outside. Although the situation changes depending on external weather conditions, in the conventional ventilation fans mentioned above, since the output of the motor is constant, the ventilation air volume changes due to fluctuations in ventilation resistance, making it impossible to obtain optimal ventilation performance. there were.

The present invention has been made in view of the above circumstances, and its purpose is to modify the output of the motor according to ventilation resistance fluctuation factors such as the structure of the house and external weather conditions, thereby stabilizing good ventilation performance at all times. There are ventilation fans available.

[Structure of the Invention (Means for Solving the Problems)] The present invention provides a main body that includes a blower device including a blower blade and a motor for rotationally driving the blower blade, and discharges air through a ventilation passage by rotation of the blower blade. a wind pressure responsive body provided in the ventilation passage of the main body so as to be displaced in response to wind pressure in the ventilation passage; a position detection device that detects the displacement position of the wind pressure responsive body and outputs a position detection signal; It is configured to include a control circuit that controls the output of the motor to obtain a predetermined ventilation air volume based on the position detection signal from the position detection device.

(Function) The ventilation air volume changes depending on ventilation resistance fluctuation factors such as the house structure and external weather conditions, but this ventilation air m can be detected by the wind pressure applied to the wind pressure responsive body, and this wind pressure is It can be detected by changing the position of the body.

During the ventilation operation, the position of the wind pressure responsive body is detected by the position detection device. The control circuit controls the output of the motor so that the ventilation air volume is a predetermined ventilation air volume based on the position detection signal from the position detection device. Therefore, the motor output is modified according to the ventilation resistance variation factor,
As a result, good ventilation performance can always be stably obtained.

(Example) An example in which the present invention is applied to a range hood fan will be described below with reference to the drawings.

First, in FIG. 1, 1 is the main body, which is inside the hood 2 and has a fan casing 3. It is constructed by disposing a blower device 6 consisting of a centrifugal fan 4 serving as a blower blade and a DC motor 5. In the hood 2, the lower opening is the intake port 2.
a, and a filter 7 is installed in this intake port 2a. Further, a vent 2b is formed in the upper plate portion of the hood 2 and communicates with the discharge port of the fan casing 3, and an exhaust casing 8 is provided above the vent 2b so as to communicate with the vent 2b. An exhaust port 9 is formed on the rear surface of the exhaust casing 8. Such body 1
is disposed on the wall of the room, and in this case, the exhaust port 9 communicates with the outside via an exhaust duct 10. When the centrifugal fan 4 is rotationally driven by the motor 5, indoor air flows into the fan casing 3 through the intake port 2a and the intake port 3a of the fan casing 3, as shown by arrow A in the figure.
and the vent 2b, the exhaust casing 8
Inside, exhaust port 9. It is exhausted to the outside through the exhaust duct 10.

Reference numeral 11 denotes a wind pressure responsive body, for example, a shutter that also serves to prevent people from being blown away by the wind, and one end of this is rotatably attached to a ventilation passage in the main body 1, for example, a vent 2b of the hood 2. This shutter 11 closes the vent 2b when the operation is stopped, and rotates upward in response to the discharge air pressure from the blower device 6 during operation. Reference numeral 12 denotes a position detection device, which includes a magnet 13, and a first reed switch 14 and a second reed switch 15, which are normally open and open when the magnet 13 approaches. The two-legged magnet 13 is attached to the shutter 11 and rotates with the shutter 11. Also, each reed switch 1
4.15 are arranged on the inner surface of the exhaust casing 8 at predetermined angular positions in the rotation locus of the magnet 13, and the first reed switch 14 adjusts the opening angle of the shutter 11 corresponding to the appropriate ventilation air volume. The second reed switch 15 is placed in a second angular position that substantially coincides with the second angular position.
lies at the angular position. In FIG. 2, 16 is a signal output circuit constituting a part of the position detection device 12, which connects each reed switch 14.15 and pull-down resistor 17.17 between the DC power supply line Vcc and the ground. When each reed switch 14, 15 is opened, the first position detection signal S1. Second position detection signal S
2 (both high level) is output. 1 and 2, reference numeral 18 denotes a control circuit composed of, for example, a microcomputer, which is provided in the control box portion 2b on the back surface of the lower front plate of the hood 2. As shown in FIG. The device detection signals sl and s2 constituted by the signal output circuit 16 are transmitted to this control circuit 18.
It is designed to be given to Reference numeral 19 denotes a drive circuit for the motor 5, which is capable of changing the voltage applied to the motor 5 in stages according to a control signal Ss given from the control circuit 1B, so that the output of the motor 5 can be controlled. It has become. Further, 20 is a lamp as an abnormality alarm, and its lighting is controlled by the control circuit 18. 21 is an operation start switch.

1.1-The action of structural acid will be explained together with the control function of the control circuit 18.

Now, when the operation start switch 21 is turned on, the control circuit 1
8 outputs a control signal Ss to drive the motor 5 at an initial setting voltage via a drive circuit 19. As a result, the sirocco fan 4 is driven to rotate, and as a result, as described above, indoor air is sucked in as shown by the arrow A, and is discharged from the vent 2b while opening the shutter 11 with its wind pressure. Inside the exhaust casing 8, the exhaust port 9. Exhaust duct 10
is discharged outdoors through the In this case, the presence or absence of each signal sl and s2 from the signal output circuit 16 is determined after a certain period of time has elapsed, taking into account the rotation start-up of the centrifugal fan 4 and the like.

The shutter 11 is rotated to a position where the wind pressure of the blower 6 and the ventilation resistance are balanced. This rotational position of the shutter 11 is the first angular position (reed switch 1
4), the reed switches 14 and 15 are both open, so the position detection signals s1 and s2 are not output. In this way η;
When none of the signals S, S2 are input to the control circuit 18, the control circuit 18 outputs a control signal Ss so as to increase the voltage applied to the motor 5 in stages. As a result, the output of the motor 5 is increased in stages, that is, the force of the air blower 6 is increased. As a result, shutter 11
The wind pressure of the air blower 6 increases gradually, and the rotation angle of the shutter 11 increases against the ventilation resistance. When the shutter 11 is rotated to the first angular position where the first reed switch 14 exists, the magnet 13 comes close to the first reed switch 14, thereby closing the reed switch 14. With this, the position is detected, and as a result, the signal output circuit 16 outputs the first position detection signal S1. When the first position detection signal S1 is input in a state where the second position detection signal S2 is not input, the control circuit 18 outputs a control signal Ss to maintain the output of the motor 5 in that state. do. Therefore, the rotation angle of the shutter 11 is maintained at a rotation angle that provides an appropriate amount of ventilation air. As can be seen from this, the control circuit 18
increases the output of the motor 5 until the shutter 11 reaches a rotational angle position that can obtain an appropriate ventilation air volume.
Regardless of whether ventilation resistance is high or low, an appropriate ventilation air volume can always be obtained.

Here, in a state where the ventilation air volume is maintained appropriately in this way, if the ventilation resistance suddenly decreases due to a sudden change in the direction of the outside wind, etc., the relative ventilation capacity of the ventilation device 6 will decrease. increases, and the shutter 11 suddenly rotates greatly. In this case, since the first reed switch 14 is opened and the output of the first position detection signal S1 is stopped, and the second reed switch 15 is closed by the magnet 13, the output of the second position detection signal S2 is is output. With this, only the second position detection signal S2 is manually input to the control circuit 18,
With this, the control circuit 18 outputs a control signal Ss so that the voltage applied to the motor 5 is lowered in stages, that is, the output of the motor 5 is lowered in stages. Then, when the shutter 11 reaches the first angular position where the first reed switch 14 exists, the second reed switch 15
Since the reed switch 14 is already in the open state and the first reed switch 14 is closed, the control signal Ss is outputted so as to maintain the output of the motor 5 at the current output state. Note that even if the output of the motor 5 is increased to the specified maximum output, if the shutter 11 is not rotated to the first angular position where the first reed switch 14 is located, the drive of the motor 5 is stopped and the lamp is turned off. 20 is lit to indicate an abnormality.

In addition, in the two-legged embodiment, a shutter was exemplified as a wind pressure responsive body, but since the wind pressure responsive body only needs to be displaced in response to wind pressure in the ventilation path, the function as a shutter is not necessarily required. A narrow plate-shaped shrine may also be used. In addition, the wind pressure responsive body is not limited to one that rotates and displaces;
For example, it may be one that moves linearly in the vertical direction.

Further, the position detection device may be one using an optical sensor or the like or one using a microswitch.

The pond water invention is not limited to the above embodiments,
For example, it can be applied to a ceiling ventilation fan in addition to a range hood fan, and can be modified in various ways without departing from the scope of the invention.

[Effects of the Invention] As is clear from the above description, the present invention provides a wind pressure-responsive body in the ventilation passage of the main body so as to be displaced in response to wind pressure in the ventilation passage, and also provides a wind pressure-responsive body that changes the displacement position of the wind pressure-responsive body. We installed a position detection device that detects and outputs a position detection signal, and a control circuit that controls the output of the motor to obtain a predetermined ventilation air volume based on the position detection signal from this position detection device. The output of the motor can be adjusted in accordance with ventilation resistance fluctuation factors such as external weather conditions, and excellent ventilation performance can therefore be consistently and stably obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall vertical sectional side view, Fig. 2 is a diagram showing the electrical configuration (root), 5 is a motor, 6 is a blower, and 11 is a shutter (wind pressure responsive). body), 12
is a position detection device, 13 is a magnet, 14 is a first reed switch, 15 is a second reed switch, 18 is a control circuit,
20 is a lamp.

Claims (1)

[Claims] 1. A main body that includes a blower device consisting of a blower blade and a motor that rotationally drives the blower blade, and discharges air through a ventilation passage by rotation of the blower blade, and a body that is displaced by the wind pressure in the ventilation passage in the ventilation passage of the main body. A wind pressure responsive body provided to and a control circuit for controlling the output of the motor to obtain the ventilation fan.