JPH07190444A - Induced draft ventilator - Google Patents

Abstract

PURPOSE:To obtain an induced draft ventilator enabling stabilization of the quantity of indoor air being exhausted and further improvement of an induced draft ventilation efficiency. CONSTITUTION:This induced draft ventilator has a constitution provided with a conical venturi part 4 which joins smoothly an induction port 2 and an exhaust port 3 formed in shapes of cylinders having different diameters and with a case 8 in which a pressure chamber 6 communicating with the venturi part 4 through a slit 5 opened at the inner peripheral part of this venturi part 4 and also a projecting wall 8 extending in the axial direction in the pressure chamber 6 and having a thinned fore end are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction ventilator for mainly changing the air in a room such as an office or a living room.

[0002]

2. Description of the Related Art In recent years, housing has become highly airtight, and as a result, the need for ventilation is increasing. It is required to improve the comfort of the living space by performing more efficient ventilation with low noise. Has been.

In a conventional ventilation device, air in a room is generally exhausted to the outside by using an electric motor and blades, but in order to improve indoor comfort, it is important to reduce noise of the electric motor and the blades. It was a problem.

Therefore, as a ventilator that does not use an electric motor or a blade that is a source of noise, there has been proposed an induction ventilator that performs ventilation by using air attraction.

Hereinafter, this type of induction ventilation device will be described with reference to FIG.
The description will be made with reference to FIG. As shown in the figure,
The ventilation device 101 is provided in a ventilation duct 107 that connects a suction port 103 attached to a ceiling 102 and an exhaust port 105 attached to an outer wall 104 of a building with a ceiling 106. In addition, the ventilation device 101 surrounds the venturi portion 108 and an outer peripheral portion of the venturi portion 108, and a slit 109 is formed in the venturi portion 108.
Is connected to a main body case 111 so as to form a pressure chamber 110 communicating with the blower duct 114 communicating with a blower fan 113 or the like installed outside the building 112. It had been.

When the room 115 is ventilated by the ventilation device 101 having such a structure, the blower fan 11
3 is operated, and air is pressure-fed into the ventilation duct 114.
Then, by blowing air from the pressure chamber 110 through the slit 109 to the venturi portion 108,
The dirty air 116 in the room 115 is attracted to the venturi section 108 from the suction port 103 provided in the ceiling 102, and the air blown out from the slit 109 together with the exhaust port 105.
Was discharged from outside the building to 112.

[0007]

In such a conventional induction ventilator 101, when the air sent from the blower fan 113 enters the pressure chamber 110, the air does not flow smoothly in the slit 109 direction. Since the air wall 110 on the opposite side of the air intake port 117 of 110 violently collides, the pressure balance is disturbed, resulting in an uneven pressure distribution, and the air blown from the slit 109 to the venturi portion 108 is uneven and sparse. Therefore, the suction port 103 provided on the ceiling 102
There is a problem in that the amount of indoor air attracted from is not stable, the attractive ventilation efficiency is poor, and the noise is high.

The present invention is to solve the above-mentioned problems, and the air entering the pressure chamber goes around the entire circumference without being disturbed,
To smoothly and evenly blow out the air from the slit to the venturi section, to stabilize the amount of indoor air to be exhausted, improve the induction ventilation efficiency, and provide an induction ventilation device that can reduce noise. 1
The purpose of.

A second object is to eliminate the resistance in the vicinity of the slit portion by the projecting wall, to make the air blown out from the slit to the venturi portion more uniform, to stabilize the amount of indoor air exhausted, and to further improve the induced ventilation efficiency. Is to let.

[0010]

SUMMARY OF THE INVENTION In order to achieve the first object, the induction ventilator of the present invention has a first means, which is a conical shape in which an inlet and an outlet having a cylindrical shape with different diameters are smoothly connected. -Shaped venturi portion, a pressure chamber surrounding the outer peripheral portion of the venturi portion, and communicating with the venturi portion through a slit opening in the inner peripheral portion of the venturi portion, and an air intake port provided in the pressure chamber And a case for forming a projecting wall extending in the axial direction on the facing wall, and the tip of the projecting wall is thinned.

In order to achieve the second object, the second
The above means has a structure in which the protruding wall is inclined in a shape that becomes lower toward the slit.

[0012]

According to the present invention, with the structure of the above-mentioned first means, the air that has entered the pressure chamber is divided by the projecting wall and goes around the entire circumference without being disturbed. The air can be smoothly and evenly blown to the venturi portion, so that the amount of room air to be exhausted can be stabilized, the induction ventilation efficiency can be improved, and the noise can be reduced.

Further, by the constitution of the second means, the resistance in the vicinity of the slit due to the projecting wall is eliminated, and the venturi portion blows air evenly and smoothly from the slit,
It is possible to further stabilize the amount of indoor air to be exhausted and further improve the induced ventilation efficiency.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, the main body 1 of the induction ventilation device
Is a guide port 2 and an exhaust port 3 which have cylindrical shapes with different diameters.
The conical venturi portion 4 in which the above are smoothly connected and the outer peripheral portion of the venturi portion 4 are surrounded,
A pressure chamber 6 communicating with the venturi portion 4 is formed through a slit 5 opening in the inner peripheral portion of the air chamber, and a tip extending in the axial direction is formed on a facing wall of an air intake port 7 provided in the pressure chamber 6. The case 9 is formed so as to form the thin protruding wall 8. The room air 12 is drawn from the suction port 11 opening to the ceiling 10 and exhausted to the outside 13 of the building from the exhaust port 14. A blower fan 15 for sending air to the pressure chamber 6 is installed on the ceiling 16 or the like, and the case 9 and the air duct 1 are installed.
Connected by 7.

In the above structure, the air pressure-fed from the blower fan 15 is sent to the pressure chamber 6 of the main body 1 of the induction ventilation device through the blower duct 17. This air is divided by the projecting wall 8 and goes around the entire circumference without being disturbed, so that the pressure inside the pressure chamber 6 is evenly distributed, and the air is smoothly and evenly blown to the venturi portion 4. At this time, the blown air flows along the inner wall of the venturi portion 4 to generate a negative pressure region, and the dirty indoor air 12 is attracted from the suction port 11 opened in the ceiling 10, and the exhausted air 14 together with the blown air. Can be exhausted from outside to the building 13.

In the first embodiment, the blower fan 15 is used as the supply means for sending air under pressure, but a compressor or the like may be used. Further, the installation position of the blower fan 15 is also the ceiling 16 in the first embodiment, but it may be installed outdoors or in a remote place such as a machine room.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, the projecting wall 8a has a shape inclining downward toward the slit 5.

In the above-mentioned structure, the air diverted to the projecting wall 8 flows in the direction of the slit 5 along the inclined surface while rotating around the entire circumference, and the resistance in the vicinity of the slit 5 disappears. It is possible to make the air blown out to the air more even.

[0021]

As is apparent from the above embodiments, according to the present invention, a pressure chamber communicating with the venturi portion via a slit opening in the inner peripheral portion of the venturi portion is formed, and the inside of the pressure chamber is formed. Since the case that forms a protruding wall with a thin tip extending in the axial direction is formed on the facing wall of the air intake port provided in, the air entering the pressure chamber is diverted to the protruding wall and is distributed around the entire circumference without being disturbed. Since it rotates, the pressure inside the pressure chamber is evenly distributed, and the blowout from the slit is smooth and
It is possible to provide the induction ventilation device that can be uniformly blown to the venturi portion, stabilize the amount of air in the exhausted room, further improve the induction ventilation efficiency, and reduce noise. In addition, since the protruding wall is shaped to have a slope that decreases toward the slit direction, the air entering the pressure chamber goes around the entire circumference while facing the slit direction, making the air blown from the slit to the venturi part more even. Further, the amount of indoor air to be exhausted can be made more stable, and the induced ventilation efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main body of an induction ventilation device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the inside of the main body of the induction ventilation device of the first embodiment.

FIG. 3 is a schematic diagram showing the configuration of the induction ventilation device of the first embodiment.

FIG. 4 is a cross-sectional view showing the configuration of the main body of the induction ventilation device of the second embodiment.

FIG. 5 is a schematic diagram showing a configuration of a conventional induction ventilation device.

FIG. 6 is a cross-sectional view showing a configuration of a main body of a conventional induction ventilation device.

[Explanation of symbols]

 2 Inlet port 3 Exhaust port 4 Venturi part 5 Slit 6 Pressure chamber 7 Air intake port 8 Projection wall 8a Projection wall 9 Case

Claims (2)

[Claims] 1. A conical venturi portion smoothly connecting an inlet port and an exhaust port, each of which has a cylindrical shape with a different diameter, and a slit that surrounds an outer peripheral portion of the venturi portion and opens at an inner peripheral portion of the venturi portion. A pressure chamber communicating with the venturi portion via a vent chamber; and a case in which a projecting wall extending in the axial direction is formed on a facing wall of an air intake port provided in the pressure chamber, and the tip of the projecting wall is formed thin. Induction ventilation system. 2. The induction ventilation device according to claim 1, wherein the projecting wall is inclined so as to be lowered toward the slit direction.