JP2000297955A - Range hood fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, at low cost, a range hood fan wherein its operation is assured regardless of simple configuration, no bad effects is caused by air- pressure difference between indoor and outdoor when a range hood fan is used, exhausting is efficient, a malfunction is found without delay as its open/close state is visually observed from outdoor, and its maintenance is easily performed from indoor side. SOLUTION: Related to a simultaneous air supply/discharge type range hood fan wherein, with a blowout opening 4a for supplying air provided, the outside air is taken in through an air-supply duct 11 communicating with outside of a building when an indoor polluted air is discharged outdoor, the blowout opening 4a on indoor side which communicates with the air-supply dust 11 is provided with a shutter 5 which rotates on axes 5a and 5b as a supporting point to open the blowout opening 4a when receiving a wind pressure from outdoor due to air-pressure difference between indoor and outdoor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range hood fan which is installed above a heating cooking facility such as a gas range and discharges oily smoke during cooking to the outside.

[0002]

2. Description of the Related Art Generally, a range hood fan is provided above a heating cooking facility such as a gas range in a kitchen to exhaust oil smoke and the like during cooking to the outside.
In this range hood fan, a substantially box-shaped hood main body having an open lower surface is communicated with the outside of the building via an exhaust duct. The sucked indoor dirty air is exhausted to the outside through an exhaust duct.

[0003] In recent years, the airtightness of dwellings tends to be improved from the viewpoint of energy saving or soundproofing measures. If the indoor air is forcibly exhausted by using a range hood fan in such a highly airtight house, not only the exhaust efficiency is poor, but also a pressure difference is generated between the indoor and outdoor areas, and the door is not closed. Opening and closing the door becomes difficult, or air flows into the room from an unintended small gap, causing various unpleasant beat sounds.

Therefore, a simultaneous supply / exhaust type range hood fan as shown in FIGS. 5 and 6 has been installed in a place where such a problem may occur. This simultaneous supply and exhaust type range hood fan has an
An air supply path for external air intake communicating with the air supply duct 11 is provided.

[0005] The air supply path includes an air supply / exhaust unit 2 fixed on the upper surface of the hood main body 1 in a state where the front (in the left front direction in FIG. 5) is opened, and a front side thereof communicating with the air supply / exhaust unit 2 (The left side in FIG. 6), and comprises a front curtain plate 4 covering the front surface of the air supply box 3.

The air supply / exhaust unit 2 is provided with an exhaust opening (not shown) and an air supply opening (not shown) on its upper surface, and an exhaust joint 6 and an air supply are provided so as to communicate with the respective openings. A joint 7 is attached, and the exhaust duct 6 and the air supply joint 7 are respectively connected to the exhaust duct 1 connected to the outside.
0 and the air supply duct 11 are connected. A partition 2c is provided around the lower side of the exhaust opening,
This opening communicates only with an exhaust port (not shown) provided on the upper surface of the hood main body 1.

The lower end of the air supply box 3 is opened so as to communicate with an open part in front of the air supply / exhaust unit 2.
It has a frame shape with an open front.

The front curtain plate 4 is mounted on the upper side of the hood main body 1 so as to cover the front surface of the air supply box 3, and a plurality of front curtain plates 4 are provided at predetermined positions on the front surface so as to communicate with the inside of the air supply box 3. Air outlet 4b is provided.

In the conventional range hood fan having the above-described configuration, a built-in fan (not shown) is operated to discharge indoor dirty air from the exhaust duct 10, and when the indoor pressure becomes negative, the range hood fan shown in FIG. As shown by an arrow, outside air is introduced indoors from an air supply path communicating with the outside.

In general, in a conventional range hood fan of this type, an air supply path is always opened to communicate with the outside. However, as shown in FIG. 6, a butterfly shutter driven by a motor 17 is used. In some cases, 16 was provided in the air supply joint 7.

[0011]

In the above-mentioned conventional range hood fan, the one in which the air supply portion is opened in a state of communicating with the outside always has the ingress and egress of the outside air, which significantly impairs the cooling and heating efficiency. There was a problem.

In the case where the shutter is provided in the air supply section, such a problem does not occur. However, in order to freely and freely open and close the butterfly type shutter in the cylindrical air supply joint, the shutter must be provided. It must have a special shape of a substantially elliptical shape, and the shutter must not be in sliding contact with the inner peripheral surface of the air supply joint to prevent its rotation, requiring high assembly processing accuracy and cost. There was a problem of inviting up. Moreover, with this type of butterfly shutter, a certain amount of clearance margin must be provided between the shutter and the inner periphery of the air supply joint for its smooth operation, and the air supply path can be completely shut off. There was also a problem that it could not be done. Further, the butterfly shutter has a problem that its operating state cannot be visually recognized from the outside and its maintenance is difficult to perform.

An object of the present invention is to solve the problems of the conventional range hood fan.

[0014]

In order to solve the above-mentioned problems, the present invention according to the first aspect of the present invention is provided with an air supply outlet, and exhausts indoor dirty air to the outside. At the same time, in a simultaneous supply / exhaust type range hood fan in which outside air is taken in from an air supply duct communicating with the outside of the building, this air outlet is opened and closed by an indoor air outlet connected to the air supply duct. The shutter is provided so that the open / closed state of the shutter can be visually recognized from the indoor side.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the shutter is rotatable at an eccentric position so as to be opened and closed by receiving a wind pressure due to a pressure difference between an indoor room and an outdoor room. It is characterized by being pivoted and limited.

A third aspect of the present invention is characterized in that, in the configuration of the first aspect of the present invention, the shutter is electrically driven to be opened and closed by a motor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. The same functional parts as those shown in the conventional example are denoted by the same reference numerals.

FIG. 1 is an exploded perspective view showing an embodiment of a range hood fan of the present invention, and FIG. 2 is a front view of an assembled state thereof. This range hood fan has a substantially box-shaped hood body 1 having an open lower surface, a supply / exhaust unit 2 attached to the upper surface of the hood body 1, and a front side of the supply / exhaust unit 2 (see FIG. 1 has a supply box 3 attached to the front left side and a front curtain plate 4 that covers the front surface of the supply box 3.

The air supply / exhaust unit 2 has a substantially lid shape with an open front and a lower surface, and is provided with an exhaust opening 2a and an air supply opening 2b on the upper surface. An exhaust joint 6 for connecting an exhaust duct (see reference numeral 10 in FIG. 4) and an air supply joint 7 for connecting an air supply duct (see reference numeral 11 in FIG. 3) are provided so as to communicate with the openings 2a and 2b. It can be attached. A partition wall 2 is provided below the exhaust opening 2a so as to surround the opening 2a and separate from the surroundings.
c is provided, and this opening 2 a is made to communicate only with the exhaust port 1 a provided on the upper surface of the hood main body 1.

The air supply box 3 has an opening 3a at a lower rear portion (right rear side in FIG. 1) and a front surface (left front side in FIG. 1) so as to communicate with an open portion in front of the air supply / exhaust unit 2. ) Is an open, substantially box-shaped one.

The front curtain plate 4 covers the upper front surface of the hood main body 1 including the front surface of the air supply box 3, and is provided with an air supply outlet 4a at a predetermined position.

In FIG. 1, reference numeral 8 denotes the exhaust joint 6.
The shutter is installed inside, is always in a state where the exhaust path is closed, rotates by receiving exhaust pressure,
The exhaust path is opened.

Here, in the range hood fan of the present invention, a shutter 5 is provided at the open front of the air supply box 3.
Is provided. The shutter 5 has a horizontally long plate shape, and is rotatably supported by attaching both sides thereof to left and right side plates 3a, 3b of the air supply box 3 with shafts 5a, 5b. The shafts 5a and 5b are mounted slightly above the center of gravity of the shutter 5, so that the shafts 5a and 5b are normally stably held in a substantially vertical state, and are mounted on the front side of the air supply box 3 as shown in FIG. The blower opening 4a of the front curtain plate 4 is closed.

In addition, an exhaust fan 13 is provided in the hood body 1 as shown in FIG. 4, and a filter 12 is provided so as to cover the suction side (lower left side in FIG. 4) of the fan 13. ing. 15 is the fan 1
3 shows a fan case in which the fan case 3 is housed. The fan case 15 is provided so as to open to an exhaust port 1 a provided on the top surface of the hood body 1. Reference numeral 14 denotes a motor for driving the fan 13, and 9 denotes an operation switch.

The range hood fan of the present invention has the above configuration.

Next, the operation of the range hood fan of the present invention having the above configuration will be described.

First, when the switch 9 attached to the front of the hood main body 1 is operated to turn on the power to the motor 14, the fan 13 is driven to rotate by the motor 14, and the air in the fan case 15 As shown by an arrow, the air is discharged from the exhaust port 1a to the outside through the exhaust duct 10.
As a result, the air pressure inside the fan case 15 decreases, so that indoor air is sucked into the fan case 15 sequentially from below the hood body 1, and this air is discharged outside through the exhaust duct 10 in the same manner as described above. Is done. At this time,
Oil smoke and the like floating in the air are captured by the filter 12 disposed in front of the fan case 15.

When the indoor air is exhausted in this way, the indoor air pressure eventually drops, causing a pressure difference between the indoor air and the outdoor air. Then, when the pressure difference between the indoor and the outdoor is generated, air flows into the indoor from the air supply duct 11 communicating with the outdoor as shown by an arrow in FIG. At this time, a shutter 5 is attached to the indoor air outlet 4a. Since the shutter 5 is rotatably supported by the shafts 5a and 5b, a broken line in FIG. Then, the air outlet 4a is opened by rotating in the direction shown by the solid line from the state shown by. Therefore, there is no fear that the inflow of the air is prevented.

The motor 14 of the range hood fan
Is stopped and the suction of air is stopped, and the air flowing into the room from the outlet 4a eventually balances the air pressure inside and outside the room, and the flow of air stops. Therefore,
The shutter 5 stops receiving wind pressure, returns to its original state by its own weight, and closes the outlet 4a.

As described above, in the range hood fan of the present invention, when exhausting indoor dirty air, fresh outdoor air flows into the indoor sequentially from the outlet 4a. As a result, the pressure difference between the indoor and the outside is alleviated, the adverse effects caused by the pressure difference are eliminated, and the exhaust efficiency of the range hood fan is improved.

The shutter 5 may be rotatable in either the left or right direction from the suspended state. However, the shutter 5 can be rotated only on one side, that is, in the direction in which the lower end of the shutter 5 projects outward. If it can be moved, the flow of air in the exhaust direction when the range hood fan is not used will be blocked, and there is no danger of lowering the cooling and heating efficiency.

In the above embodiment, the shutter 5 is rotated by the wind pressure to open and close the outlet 4a. However, the shutter 5 is forcibly linked with the operation of the range hood fan. It may be electrically driven using a motor (not shown) so that the shutter can be opened and closed automatically. In this case, when the range hood fan is not used, the shutter is affected by the outdoor wind. 5
Is reliably prevented from being accidentally opened.

[0033]

As described above, according to the present invention, the shutter according to the first aspect of the present invention is provided with the shutter at the indoor side outlet which communicates with the air supply duct of the range hood fan. Compared to a butterfly shutter, its operation is reliable despite its simple structure,
A range hood fan that does not have various adverse effects due to a difference in air pressure between the inside and outside of the hood when the range hood fan is used and has good exhaust efficiency can be realized at low cost. Further, since the open / close state can be visually recognized from the indoor side, there is an effect that even if an operation failure occurs, it can be immediately recognized, and the maintenance thereof can be easily performed from the indoor side.

According to a second aspect of the present invention, a range hood fan having the effects of the first aspect of the present invention is provided at low cost by pivotally supporting the shutter at an eccentric position so as to be opened and closed by wind pressure. There is an effect that can be.

According to the third aspect of the invention, unnecessary shutter air can be prevented from flowing into and out of the room by electrically opening and closing the shutter by a motor. In addition to the effects of the invention, the effect of improving the cooling and heating efficiency of the building can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of a range hood fan according to the present invention.

FIG. 2 is a front view of an assembled state of the range hood fan shown in FIG.

FIG. 3 is an explanatory sectional view of an air supply portion of the range hood fan of the present invention.

FIG. 4 is an explanatory sectional view of an exhaust portion of the range hood fan of the present invention.

FIG. 5 is a partially cutaway perspective view of a conventional range hood fan.

FIG. 6 is an explanatory sectional view of an exhaust portion of a conventional range hood fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hood main body 1a Exhaust port 2 Supply / exhaust unit 2a Opening for exhaust 2b Opening for air supply 2c Partition wall 3 Air supply box 3a Opening 3b, 3c Side plate 4 Front curtain plate 4a Air outlet 5 Shutter 5a, 5b Shaft 6 Exhaust joint 7 air supply joint 8 shutter 9 switch 10 exhaust duct 11 air supply duct 12 filter 13 fan 14 motor 15 fan case

Claims (3)

[Claims] 1. A simultaneous air supply / exhaust type air supply system comprising a supply air outlet, wherein when exhausting indoor dirty air to the outside, outside air is taken in from an air supply duct communicating with the outside of the building. In a range hood fan, a shutter for opening and closing the air outlet is provided at an indoor air outlet connected to the air supply duct so that the open / closed state of the air outlet can be visually recognized from the indoor side. fan. 2. The shutter according to claim 1, wherein the shutter is pivotally supported at an eccentric position so as to be rotatable, and is opened and closed by receiving a wind pressure caused by a pressure difference between indoor and outdoor. The described range hood fan. 3. The range hood fan according to claim 1, wherein said shutter is electrically driven to open and close by a motor.