JPH07233991A - Ventilating device - Google Patents

Abstract

PURPOSE:To contrive the improvement of the performance characteristics regard ing exhaust air volume, noises, etc., by forming the exhaust opening side of a frame for retaining and storing an electric motor into an arcuate shape. CONSTITUTION:In a main body 25 of a ventilating device, a covering is provided on a frame 15 to form an air flow passage 26 in the main body 25 and an electric motor 5 fitted with a blade 3 is fixed in the air flow passage 26 with arms. An exhaust opening 27 constricted inwardly in a smooth and arcuate manner is formed on the exhaust side surface 17 of the frame 15. By this structure, the inlet area of the exhaust opening 27 is enlarged and the resistance of the wall to the air flow is reduced. In this way the air swirl phenomenon in the exhaust opening 27 is lessened, the ventilating performance is improved and the performance characteristics regarding exhaust air volume, noises, etc., can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a ventilation device which improves performance such as air volume and noise of the ventilation device connected between exhaust ducts.

[0002]

2. Description of the Related Art In the prior art, as shown in FIG. 1, a box-shaped frame 1 and a lid 2 for covering the box-shaped frame 1 are joined together to form an air passage therein, and an electric motor 5 having blades 3 attached thereto. In the box-shaped air passage, the top plate 6 and the exhaust side surface 8 are at a right angle, and this portion becomes a resistance against the wind direction vector 10. In this way, the exhaust side surface 8 faces perpendicularly to the wind direction vector 10 and the shape of the exhaust port area is drastically reduced.
The direction of travel is changed as shown in Nos. 1 and 12, and the phenomenon of the swirling wind 14 occurs in the rear portion 9 of the electric motor, which disturbs the exhaust flow and increases the sound, resulting in adverse effects such that the best performance characteristics cannot be obtained.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to minimize the turbulence of the air flow on the exhaust port side in the above conventional technique.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by changing a conventional exhaust side surface 8 to an exhaust side surface 17 in FIG. The exhaust port area was made wider than before, and at the same time, the shape was gradually reduced and improved.

[0005]

According to the present invention, as in the side surface 17 on the exhaust side of FIG. 2, a smooth arc-shaped portion is provided in the inner direction of the air flow passage, so that the air flow direction vector 18 has a resistance to the air flow advancing direction more than before. It decreases and flows along the inner walls of the frames 15, 16. Therefore, the wind direction vectors 11 and 12 whose air flow direction has been changed by the exhaust side surface 17 flow along the smooth arc-shaped wall surface by the arc-shaped exhaust side surface 17, so that the wind direction vectors 19 and 20 The vector becomes smaller. The air volume corresponding to the decrease in the vectors of the wind directions 19 and 20 is the wind direction vector 2 at the exhaust side surface 17.
The exhaust air volume is increased and the blowing noise is reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the present invention will be described below with reference to FIG. FIG. 2 shows the internal structure of the ventilation device as viewed from the side of the ventilation device installed in the exhaust duct. The main body 25 of the present ventilation device forms the air passage 26 inside the main body by assembling the frame 15. In the air passage 26, the electric motor 5 having the blades 3 is fixed by the arm 4 in the air passage. . The exhaust-side side surface 17 of the frame 15 forms a smooth arc-shaped inner side with a recessed exhaust port 27. With this structure, the inlet area of the exhaust port 27 is expanded, and the resistance of the wall that obstructs the air flow direction is reduced.

FIG. 2 shows the air blowing inside the air blowing passage during operation. Since the smooth arc-shaped exhaust side surface 17 is provided inside the air blowing passage 26, the air flow direction vector 19 decreases, so that the air blowing is reduced. The resistance to the traveling direction is reduced as compared with the conventional one, and the wind direction vector 19 is reduced, so that the wind direction vector 20 is increased and the exhaust air volume is increased. Further, due to the reduction of the wind direction vector 19, the phenomenon of entering the inside of the exhaust port portion is small, the phenomenon in which the swirling wind 22 occurs is extremely small, and the sound generated by the mixed flow of winds can be suppressed.

Due to the exhaust side surface 17, the resistance in the direction of air flow is reduced and the air flow resistance is reduced, so that the performance such as noise and air volume can be improved.

[0009]

According to the present invention, on the exhaust port side of the air passage,
By forming the recessed exhaust port on the inside of the smooth arc shape, the exhaust port area is expanded and the resistance of the wall, which obstructs the air flow direction, can be reduced. Therefore, the wind vortex phenomenon at the exhaust port is reduced, the blowing performance is improved, and a ventilation device having improved performance characteristics such as exhaust air volume and noise can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an internal structure and a ventilation circulation viewed from a side surface of a conventional ventilation device.

FIG. 2 is a diagram showing an internal structure and a ventilation circulation viewed from a side surface of the ventilation device of the present invention.

[Explanation of symbols]

1, 15, 16 ... Frame, 2 ... Lid, 3 ... Blade, 4 ...
Arms 5 ... Electric motor, 6 ... Frame top plate, 7 ... Intake side plate, 8 ... Exhaust side plate, 9 ... Rear part of motor 10, 11, 1
2, 13, 18, 19, 20, 21 ... Wind direction vector,
14, 22 ... Swirl, 17 ... Exhaust side, 23 ... Exhaust duct, 24 ... Intake duct, 25 ... Main body, 26 ... Blower, 27 ... Exhaust port.

Claims (1)

[Claims] 1. A ventilator comprising a frame for holding and housing an electric motor equipped with blades, wherein the exhaust port side of the frame is formed in an arc shape.