JPS6347977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a blower device that opens and closes a shutter using the rotational reaction force of a rotatably supported stator.

(B) Prior Art There is a conventional blowing device for opening and closing a shutter using the rotational reaction force of a stator, as described in Japanese Patent Application Laid-Open No. 52-52457. The ventilation fan disclosed in this publication prevents the stator from reversing after the winding of the wire is completed, and if the wire is broken after long-term use, the stator cannot be prevented from reversing, and the motor continues to rotate abnormally. Furthermore, if the wire is wound up in the opposite direction due to the inertia of the stator due to the unwinding of the wire, when the stator is used again, the stator rotates as quickly as the wire is wound up, and a strong tensile force is applied to the wire. Wires may break.

(c) Purpose of the Invention An object of the present invention is to provide a blower device that prevents abnormal rotation of a motor due to wire breakage or the like.

(d) Structure of the Invention The present invention comprises a frame body with a shutter attached to an opening at one end so as to be freely openable and closable, an electric motor having a stator rotatably supported in the center of the frame body, and a rotor of the electric motor. It is equipped with a fixed blower blade and an opening/closing mechanism that winds the wire and opens and closes the shutter using the rotational reaction force of the stator, and a protrusion that restricts the rotation range of the fixed blower blade is provided between the electric motor and the frame body. This structure prevents the stator from rotating beyond a certain range.

(e) Example A ventilation fan 1, which is a blower device for exhausting indoor air to the outdoors, has a sheet metal frame 2 that is attached to an opening in a room wall, etc.
, a plurality of shutters 3 that can be opened and closed and are pivoted to the outdoor opening of the frame 2 , a connecting rod 4 that opens and closes the shutters 3 in conjunction with each other, and a support frame 5 that is constructed within the frame 2 . , a front and rear cup-shaped front cover 6 and a rear cover 7 which are fixed to the support frame 5 with screws, an electric motor 8 which is pivotally supported within the covers 6 and 7, and a motor 8 which protrudes from the front cover 6. A blade 11 is detachably attached to the rotating shaft 9 of the electric motor 8 using a spinner 10.
and a front panel 13 in which a wind tunnel 12 is formed and is detachably attached to the indoor opening of the frame body 2.

The shutter 3 is supported on the frame 2 by a pivot, and the shutter 3 and the connecting rod 4 are connected by inserting and locking a pivot 14 protruding from the connecting rod 4 into a vertically elongated hole formed in the shutter 3. is being carried out. Projections 15, 16, 17 are provided at the upper, middle, and lower parts of the connecting rod 4.
is formed. A locking body 18 is formed above the middle part of the connecting rod 4 of the frame 2. The locking body 18 is formed in a U-shape and is fixed to the frame body 2 by welding or the like. A spring body 19 is installed between the middle protrusion 16 of the connecting rod 4 and the locking body 18 to urge the connecting rod 4 upward and hold the shutter 3 in a closed state. The frame body 2 is provided with a regulating protrusion 20 that approaches and opposes the lower protrusion 17 of the connecting rod 4 when the shutter 3 is in the closed state.

The electric motor 8 includes a cup-shaped front case 22 and a rear case 23, each of which has a stator 21 press-fitted therein. 9 is pivotally supported, and the rotating shaft 9 protrudes from the front case 22. A cylindrical pivot shaft 26 through which the rotating shaft 9 is inserted is formed in the center of the front surface of the front case 22. A mounting body 28 having a cylindrical winding pivot shaft 27 protruding from the center of the rear surface of the rear case 23 is mounted. Bearings 29, 29 are formed at the center of the inner surfaces of the front cover 6 and the rear cover 7. The pivot shaft 2
6 and the winding pivot shaft 27 are pivotally supported by the bearings 29, 29, so that the electric motor 8 is connected to both the covers 6, 7.
It is rotatably supported inside. The winding pivot shaft 27 protrudes from the center of the rear cover 7.
The power supply cord 30 to the electric motor 8 is made up of a plurality of lead wires. The power supply cord 30 is pulled out from the outer circumference of the rear surface of the rear case 23, bent along the rear surface of the rear case 23, wired to the front of the winding pivot shaft 27, and then bent. It is inserted into the winding pivot shaft 27. A protective tube 31 is placed over a portion of the power supply cord 30 that is pulled out from the rear case 23 and reaches the front of the winding pivot shaft 27 . The portion of the power supply cord 30 covered with the protective tube 31 is attached to the mounting body 28.
It is supported by a support portion 32 formed in the rear case 23 to prevent it from rising above the rear surface of the rear case 23. A protective tube 33 is placed over the portion of the power supply cord 30 that is inserted through the winding pivot shaft 27 . The protective tube 33 is connected to the winding pivot shaft 27.
The winding pivot shaft 27 has an outer diameter substantially equal to the inner diameter of the winding pivot shaft 27.
It is shaped slightly longer than the length of. The protection tube 33 protrudes from both ends of the take-up pivot shaft 27 to prevent the power supply cord 30 from coming into direct contact with both ends of the take-up pivot shaft 27 and being damaged. A protective tube 34 is placed over a portion of the power supply cord 30 that is pulled out from the take-up pivot shaft 27 and guided and locked to the support frame 5 .
Therefore, the power supply cord 30 is connected to the winding pivot shaft 27.
The portions near the front and rear, the so-called bent portions, are not covered with a protective tube and the power supply cord 30 is exposed. Therefore, the power supply cord 30
is inserted into the take-up pivot shaft 27, which is the center of rotation of the electric motor 8, so that it is less susceptible to the rotation of the electric motor 8 and has less influence on the rotation of the electric motor 8. Further, the bent portion of the power supply cord 30 that is most affected by the twisting force accompanying the rotation of the electric motor 8 is connected to the protective tubes 31 and 3.
3 and 34 are not covered, so the protective tube 3
The power supply cord 30 is not compressed by the wrinkles caused by the twisting of the wires 1, 33, and 34, and the twisting force can be smoothly absorbed.

An annular groove 35 and a notch 36 are formed at the tip of the winding pivot shaft 27. The winding pivot shaft 27
A disc-shaped locking body 37 is attached to the holder. An insertion portion 38 into which the winding pivot shaft 27 is inserted is formed in the center of the locking body 37, and a protrusion 39 that engages with the cut groove 36 that protrudes inward in the insertion portion 38. death,
The protrusion 39 positions the locking body 37 relative to the winding pivot shaft 27 and prevents it from rotating. The locking body 37 is prevented from coming off from the winding pivot shaft 27 by a ring-shaped stopper member 40 that is fitted into the annular groove 35. The locking body 3
A hole-shaped support portion 41 is formed in the outer peripheral portion of the support portion 7 . A fixing member 42 is provided on the rear side of the rear cover 7.
One end of the protective tube 43 is attached to the locking member 18, and the other end of the protective tube 43 is attached to the locking body 18. The protective tube 43 is constructed in a generally L-shape with a gentle curve. A shutter opening/closing operation wire 44 is inserted into the protective tube 43.
One end is attached to the upper protrusion 15 of the connecting rod 4 via a buffer spring 45. An annular attachment portion 46 is formed at the tip of the wire 44, the wire 44 is inserted into the support portion 41 from below the winding pivot shaft 27, and the attachment portion 46 is attached to the retaining member 40.
It is attached to the winding pivot shaft 27 between the and the locking body 37. In this embodiment, the opening/closing mechanism of the shutter 3 is comprised of the take-up pivot shaft 27, a locking body 37, and a wire 44.

A winding portion of the wire 44, a so-called opening/closing mechanism, is covered with a cover 47. In this embodiment, the cover 47 is attached to the rear cover 7 with elastic claw pieces 48. The cover 47 has a notch that fits into a groove 49 formed at the tip of the protective tube 43 through which the wire 44 is inserted. Therefore, one end of the protective tube 43 is also supported by the cover 47. Said cover 4
7 includes an L-shaped notch 50 for inserting and locking the power supply cord 30 that covers the protective tube 34 pulled out from the winding pivot shaft 27; The rear cover 7
A presser portion 51 is formed to be held between the holder and the holder.
Therefore, the power supply cord 30 is connected to the winding pivot shaft 27.
After the cover 47 is pulled out, it does not sag.
By being pulled out further, it will not come into contact with the locking body 37 and be damaged.

Cooling holes 52 for the electric motor 8 are formed on both sides and below the inclined side surface of the front cover 6, and cooling holes 52 are similarly formed on the upper vertical surface of the rear cover 7.
3 is formed. Therefore, as the blade 11 rotates, air that enters through the through hole 52 of the front cover 6 flows around the circumferential surface of the electric motor 8 and reaches the rear cover 7.
is discharged from the through hole 53, and the electric motor 8 can be efficiently cooled. Further, when the operation of the electric motor 8 is stopped, the warm air inside the front cover 6 and the rear cover 7 rises and is discharged from the through hole 53 of the rear cover 7,
Accordingly, cold air is sucked in through the through hole 52 of the front cover 6, and the electric motor 8 is efficiently cooled even after it has stopped.

A protrusion 54 is formed on the circumferential surface of the electric motor 8. In this embodiment, one of the screws 56, 56 screwed into the flange 55 joining the front case 22 and rear case 23 of the electric motor 8 is connected to the screw 56 with a large head.
It is said that The inner surfaces of the front cover 6 and the rear cover 7 are provided with protrusions 57 that abut against the protrusions 54. In this embodiment, a protrusion 57 molded from an elastic material is attached to the vertical inner surface of the rear cover 7. When a switch (not shown) is operated to drive the electric motor 8, since the electric motor 8 is rotatably supported, rotational force is generated in the rotor 25, and the stator 21 is moved in the opposite direction by the reaction force. Try to rotate. The reaction force applied to the stator 21 is transmitted to the winding pivot shaft 27 by the front cover 6 and the rear cover 7, and winds up the wire 44. As the wire 44 is wound up, the connecting rod 4 is pulled down against the spring body 19 via the buffer spring 45, thereby opening the shutter 3. When the shutter 3 is open, the middle protrusion 16 of the connecting rod 4 comes into contact with a protrusion 58 protruding from the frame 2, and prevents the connecting rod 4 from lowering. The winding of the wire 44 is completed by preventing the connecting rod 4 from descending, and the stator 21
is locked and the electric motor 8 rotates normally.
Note that if an accident occurs in which the wire 44 is cut while the electric motor 8 is being driven, the stator 2
If there is no member to prevent the rotation of the stator 21
The rotor 25 continues to rotate in opposite directions, and the power supply cord 30 is disconnected, causing an electric leakage accident. Further, when the electric motor 8 is stopped from the driving state, the reaction force of the stator 21 disappears, so that
The wire 44 is unwound, but if the unwinding force is strong, the wire 44 may be unwound more than the initial stage of winding, and conversely wind up and stop. When the stator 21 is driven again in this state, the stator 21 rotates strongly to the extent that the wire 44 is slackened and wound up in the opposite direction, and a strong impact is applied to the wire 44, which may break the wire 44. However, by forming the abutting protrusions 54 and 57 between the electric motor 8 and the front cover 6 or the rear cover 7, the electric motor 8 can only rotate in forward and reverse directions within the range of one rotation, causing the aforementioned accident. is prevented. By accurately setting the winding amount of the wire 44 to one rotation of the electric motor 8, the impact when the shutter 3 is opened and closed can be reduced. In addition, the shutter 3
By setting the protrusions 54 and 57 to abut each other in the closed state, the impact at the beginning of winding the wire 44 can be reduced, and the possibility of the wire 44 being cut can be reduced. Furthermore, as in this embodiment, the protrusions 54, 57
The protrusion 5 is formed by molding one of the elastic materials.
4,57 impact can be softened.

(F) Effects of the Invention In the present invention, by forming a protrusion between the electric motor and the frame body to regulate the rotation range of the stator, the rotation of the stator is regulated within a certain range, and even if a wire is broken, the protrusion is formed between the motor and the frame. The stator is prevented from rotating and rotates normally, etc.
Effects such as a simple structure and a safe blower device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a ventilation fan which is a blower device of the present invention, Fig. 2 is a rear view with blades, shutters, etc. removed;
Figure 3 is a rear view with the cover removed from Figure 2, and Figure 4
The figure is an enlarged sectional view of the main part, Figure 5 is a rear view of the motor,
FIG. 6 is a side view of the electric motor, FIG. 7 is an exploded perspective view of the power supply cord extraction portion, and FIG. 8 is a cross-sectional perspective view of a portion in which a protrusion is formed on the rear cover, which is the frame. 2... Frame body, 3... Shutter, 5... Support frame,
6... Front cover, 7... Rear cover, 8... Electric motor, 27... Winding pivot shaft, 30... Power supply cord,
33...Protection tube, 54...Protrusion, 57...
Protrusion.

Claims (1)

[Scope of Claims] 1. A frame body with a shutter attached to an opening at one end so as to be openable and closable, an electric motor having a stator rotatably supported in the center of the frame body, and a stator fixed to the rotor of the electric motor. It includes a blower blade and an opening/closing mechanism that winds a wire and opens/closes the shutter using the rotational reaction force of the stator, and a protrusion is formed between the electric motor and the frame body to restrict the rotational range of the stator. A blower device is installed. 2. The electric motor is rotatably supported within a front and rear split cover attached to a support rod installed in the frame, and a protrusion is formed between the front and rear split cover and the electric motor. The blower device according to item 1.