JPH04359732A - Ventilation fan for duct - Google Patents

Abstract

PURPOSE:To provide a ventilation fan for a duct capable of preventing a finger from entering into a vane and its injurying even if a power supply switch is forgotten to be turned off and a cleaning within the main body of the ventilation fan is performed. CONSTITUTION:An electric motor 8 having a vane 7 fixed therein is disposed within a main body 6 and a grill 11 is inserted and fixed at a suction port 4 of the main body 6. An electric shutting switch 12 of the electric motor 8 closed when the grill 11 is inserted into the main body 6 is provided, thereby even if the power switch 13 is not turned off and the grill 11 is removed, a rotation of the electric motor 8 and the vane 7 can be stopped.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct ventilation fan that is attached to a ceiling surface to ventilate a room.

0002

[Prior Art] Conventionally, this type of duct ventilation fan is shown in Fig. 4.
~A configuration as shown in FIG. 6 was common.

As shown in the figure, the box-shaped main body 106 is
It is inserted through an opening 102 in the ceiling surface 101 of the living room and protrudes from the ceiling 103. On the bottom surface of this main body 106,
A suction port 104 is provided on one side, and a discharge port 105 is provided on one side. Further, an electric motor 108 to which blades 107 are fixed is disposed inside the main body 106, and an air outlet 109a of a casing 109 surrounding the blades 107 faces the discharge port 105. In addition, the air outlet 109 of the casing 109
One end of a and the discharge port 105 are connected to a tongue piece 111 fixed within the main body 106 by a mounting screw 110. Further, on the lower surface of the main body 106, a grill 112 is provided at the suction port 1.
It is removably attached to cover the 04. A power switch 113 for turning the electric motor 108 on and off is provided on a wall (not shown) in the living room.

[0004] In the above configuration, when the air contaminated with dust etc. in the living room is discharged to the outside, the power switch 11 is pressed.
3 to rotate the electric motor 108. In addition, if the inside of the main body 106 gets dirty due to ventilation operation and needs to be cleaned, first turn off the power switch 113 and turn off the motor 106.
08 and the blades 107, remove the grille 112 attached to the lower surface of the main body 101, and insert your hand into the inside of the main body 106.

[0005]

[Problems to be Solved by the Invention] In such a conventional duct ventilation fan, when cleaning the inside of the main body 106, one forgets to turn off the power switch 113 and removes the grill 112 while keeping the blades 107 rotating, and then goes inside the main body 106. There was a problem that the user could insert his/her hand and get his or her fingers caught in the blade 107, resulting in injury. Also, a casing 10 is provided inside the main body 106.
As the tongue piece 111 that connects the air outlet 109a and the discharge outlet 105 of 9 is separated and fixed with a mounting screw 110, there is a problem that the number of assembly parts is large and the number of assembly steps is increased.

The present invention solves the above problems, and provides a duct ventilation fan that can reliably prevent fingers from getting caught in the blades and causing injury even if the user forgets to turn off the power and cleans the inside of the main unit. The primary purpose is to provide.

A second object is to provide a duct ventilation fan that can reduce the number of assembly parts and the number of assembly steps without impairing the performance of the duct ventilation fan.

[0008]

[Means for Solving the Problems] The first means for achieving the first object of the present invention is to insert the device through an opening in the ceiling surface and protrude from the attic, and have a suction port on the lower surface and a side surface. A box-shaped main body having a discharge port at the front; an electric motor disposed within the main body and having a blade fixed thereto; , a tongue connecting one end of the casing air outlet and the discharge port, a grill that covers the suction port and is detachably attached to the lower surface of the main body, and only when this grill is attached, The duct ventilation fan includes a power cutoff switch for the electric motor that is in a closed state.

A second means for achieving the second object is to form a duct ventilation fan in which the tongue piece is formed integrally with the main body and protrudes into the main body.

0010

[Operation] The present invention has the structure of the first means described above.
While the duct ventilation fan is operating, when the grill is removed from the main body, the power cutoff switch is activated and becomes open, cutting off the power and stopping the motor and blades.

Furthermore, with the configuration of the second means, the discharge port and the casing can be connected by connecting one end of the casing to the tongue piece provided integrally with the main body.

0012

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in the figure, a box-shaped main body 6 is inserted through an opening 2 in a ceiling 1 of a living room and protrudes into an attic 3. The main body 6 has a suction port 4 on its lower surface and a discharge port 5 on one side thereof. Further, inside the main body 6, an electric motor 8 to which a blade 7 is fixed and a casing 9 surrounding the blade 7 are arranged, and an air outlet 9a of the casing 9 faces the discharge port 5. Air outlet 9 of casing 9
A tongue piece 10 integrally formed with the main body 6 is disposed at one end of a. Further, a grill 11 is removably attached to the lower surface of the main body 6 so as to cover the suction port 4. Furthermore, only when the grill 11 is attached to the lower part of the main body 6,
A power cutoff switch 12 for the electric motor that is in the closed state is attached. A power switch 13, a power cutoff switch 12, and an electric motor 8, which are attached to a wall (not shown) in the living room, are connected in series.

With the above configuration, when cleaning the inside of the main body 6, if one forgets to turn off the power switch 13, the electric motor 8 and blade 7
At the same time as removing the grill 11 from the main body 6 while keeping it rotating, the power cutoff switch 12 is activated to close the grill.
Power to the electric motor 8 can be cut off.

As described above, according to the duct ventilation fan of this embodiment, even if the user forgets to turn off the power switch, the blades can be stopped at the same time as the grille is removed.

Furthermore, since the tongue piece 10 connecting one end of the air outlet 9a of the casing 9 and the discharge port 5 is provided integrally with the main body 6, the discharge port can be connected without attaching any separate parts to the main body 6. 5 and the casing 9 can be easily connected.

As described above, according to the duct ventilation fan of this embodiment, the number of assembly parts can be reduced and the assembly work can be facilitated.

In this embodiment, the power cutoff switch is installed at the bottom of the main body, but regardless of its installation position, if it is closed only when the grill is attached to the main body, its operation and effect will be reduced. does not make a difference

[0019]

Effects of the Invention As is clear from the above embodiments, according to the present invention, a power cutoff switch for the electric motor is provided, which is closed only when the grill is attached. To provide a duct ventilation fan that can reliably prevent fingers from getting caught and injured even if the inside is cleaned.

Furthermore, since the tongue piece is formed integrally with the main body, the number of assembly parts is reduced and assembly work efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing the arrangement of a duct ventilation fan according to an embodiment of the present invention.

[Figure 2] Control circuit diagram

[Figure 3] Cross-sectional view of the same plane

[Figure 4] Side cross-sectional view showing the installation state of a conventional duct ventilation fan

[Figure 5] Control circuit diagram

[Figure 6] Cross-sectional view of the same plane

[Explanation of symbols]

1 Ceiling surface 2 Opening ３　　　Attic 4 Suction port 5 Discharge port 6 Main body 7 Feather 8 Electric motor 9 Casing 9a Air outlet 10 Tongue piece 11 Grill 12 Power cutoff switch

Claims (2)

[Claims] Claim 1: A box-shaped main body that is inserted through an opening in the ceiling surface and protrudes from the ceiling, and has a suction port on the lower surface and a discharge port on one side; a casing surrounding the blade and having an air outlet facing the outlet of the main body, a tongue piece connecting one end of the air outlet of the casing to the outlet, and the suction A ventilation fan for a duct comprising a grill that covers a mouth and is detachably attached to the lower surface of the main body, and a power cutoff switch for the electric motor that is closed only when the grill is attached. 2. The ventilation fan for a duct according to claim 1, wherein the tongue piece is formed integrally with the main body and protrudes into the main body.