JPH035800Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a simple ventilation device that is used by being built into a wall.

[Conventional technology and its problems]

A conventionally known ventilation system of this type has a structure in which a fan is simply attached to a wall.

By the way, in the case of the above-mentioned ventilation system, the structure is such that external noise directly enters the room through the gap between the blades, so when the external noise is large, the room is easily affected by it and it is not possible to keep the room quiet. There was a problem.

This invention was made in view of the above circumstances,
To provide a ventilation device that can prevent external sounds from entering a room and keep the room quiet even when the external noise level is high.

[Means to solve the problem]

In order to achieve such an object, the present invention includes a cylindrical casing that is provided through a wall, and a fan that is attached in the axial direction within the casing and is driven by a motor to circulate air in the axial direction. and a cylindrical duct rotatably attached to the casing, one end of the duct is rotatably supported by the casing, and the middle part of the duct has an opening at the other end aligned with the axis. The structure is such that it is bent so as to face in a direction that intersects with the .

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of the ventilation system according to the present invention.
FIG. 2 is a plan view of the device, and FIG. 3 is a circuit diagram of the device. In the figure, reference numeral 1 indicates an axial flow type fan, and this fan 1 has its center line perpendicular to the wall W by sandwiching the opening edge of the wall W between the casing 2 and the ring-shaped fixture 3. It is fixed to the wall W so that The fan 1 has the casing 2
, a motor 4 supported at approximately the center position by a casing 2, and blades 5 attached to the output shaft of the motor 4, and the motor 4 is controlled by a control circuit 6 to be described later. Forward rotation every hour
It is designed to be operated while being operated in reverse. Note that 7 indicates a protective cover provided at the opening of the fan casing 2.

On the other hand, 8 indicates a duct, and this duct 8 is provided with an internal flow path 9 bent into an L-shape.
One end of the duct 8 is rotatably provided on the outer periphery of the fan casing 2, that is, rotatably about an axis l perpendicular to the wall W,
The other end extends in a direction parallel to the wall W and is open.

In addition, a guide vane 10 is provided in the duct 8 at the bent part of the flow path 9, and sound absorbing layers 11 and 12 are provided at a predetermined interval on the other end side of the duct 8 (on the left side in FIG. 1). Further, a filter 13 and a sound insulation reflection grating 14 are attached to the other end of the duct 8.

To explain the control circuit 6 of the motor 4, as shown in FIG. 3, a parallel circuit of the motor 4 and a capacitor 15 is connected to contacts 16 and 17. Contact 1 alternatively connected to contacts 16 and 17
8 is switched via a solenoid 20 by a timer 19 whose ON-OFF time can be arbitrarily set. The power supply 21 is connected to the contact 1 via a fuse 22.
8.

Next, the operation of the ventilation system having the above configuration will be explained.

In the above ventilation system, the timer 19 is turned on in advance.
The OFF time is set to an appropriate value depending on the indoor capacity and degree of sealing. Therefore, the fan 1 is operated periodically in forward and reverse directions at appropriate intervals, thereby sending outside air into the room as shown by the dotted line arrows and discharging indoor air to the outside as shown by the solid line arrows. I do things.

At this time, the duct 7 not only absorbs external noise between the sound absorption layers 11 and 12, but also has one end connected to the fan 1.
As shown by the two-dot chain line in FIG. Intrusion can be kept to a minimum.

In addition, in the above ventilation system, the positive and
It is preferable to set the reverse switching period to a larger value as the capacity of the room becomes larger and as the degree of sealing becomes lower.

In the above embodiment, an axial fan is used, but the present invention is of course applicable to a case where a centrifugal fan is used.

[Effect of idea]

As explained above, according to the present invention, by orienting the opening at the end of the duct in any other direction so as not to face the noise source, it is possible to suppress the external noise that enters the room through the duct to the lowest possible level. This has the excellent effect of keeping the room quiet even when the external noise level is high. In addition, the weight of the duct is reduced by providing a fan in the casing that penetrates the wall, so even when installed on a vertical wall, the moment generated in the duct is small, making it easier to turn the duct at a predetermined angle. This has the effect that the effort required for operation is reduced and fixation at a predetermined angle can be facilitated.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an electric circuit diagram thereof. 1...Fan, 2...Casing, 4...Motor, 6...Control circuit, 8...Duct, 10...Guide vane, 11, 12...Sound absorption layer, W...Wall.

Claims (1)

[Scope of utility model registration request] A cylindrical casing provided through the wall;
It consists of a fan that is attached in the axial direction inside the casing and is driven by a motor to circulate air in the axial direction, and a cylindrical duct that is rotatably attached to the casing, and one end of the duct is The ventilation device is rotatably supported by the casing, and an intermediate portion of the duct is bent such that an opening at the other end faces in a direction intersecting the axis.