JPH07167471A - Suction device for local ventilation and its designing method - Google Patents

Abstract

PURPOSE:To efficiently collect contaminated air, and at the same time, assuredly capture a contamination medium, and improve the smoke-collecting and contamination medium- capturing efficiencies. CONSTITUTION:Two types of fenced shaped filter single bodies 14a, 14b, for which a plurality of column members 12a, 12b with a V-shaped cross section are arranged in parallel with a specified pitch in the width direction, and the column members 12a, 12b are held by a rectangular supporting frame 13, are alternately laminated into a plurality of stages in the thickness direction. Then, between adjoined column members 12a of the filter signal body 14a, the column members 12b of of the other filter single body 14b are arranged with a step, and a zigzag shaped bent passage in which contaminated air passes through, is formed for a ventilation filter for kitchen. Then, a suction side dynamic pressure which is at the flowing speed or higher of the contaminated air being generated by a pressure difference between the inside and outside of a hood is determined by a passing resistance of the contaminated air in the bent passage and the surface areas of the filters while being in relation to the smoke-collecting and contamination medium-capturing efficiencies, with the air volume and total pressure of a fan as references. Then, based on the suction side dynamical pressure and smoke-collecting and contamination medium-capturing efficiencies, the lateral arranging pitch and vertical arranging pitch and V angle of the column members 12a, 12b are set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation filter for a kitchen and a method of designing the same, and more particularly, it is used for local ventilation for general households and businesses, and is disposed above a range cooker installed in the kitchen. The present invention relates to a ventilation filter for a kitchen, which is detachably attached to a hood opening of a range hood ventilation fan, and a design method thereof.

[0002]

2. Description of the Related Art A hood and a fan are used as a means for exhausting smoke and steam containing oil generated from a range cooker installed in a kitchen, etc., which is used for the purpose of local ventilation for general households and businesses. There is a range hood ventilation fan that integrates and. As shown in FIG. 12, this range hood ventilation fan is generally arranged above a range cooker 1 installed in a kitchen or the like, and has a structure in which a ventilation filter 4 is detachably attached to an opening 3 of the hood 2. Target. The ventilation filter 4 mounted on the hood 2 collects polluted air such as smoke and steam generated by heating and cooking in the range cooker 1 by the rotation of the fan 5 and collects the polluted air into the polluted air. Contaminated media such as soot and oil mist [small oil particles] are collected to prevent dirt from adhering to the hood 2, the fan 5 and the duct.

More specifically, the ventilation filter 4 is a zigzag-shaped bend through which contaminated air passes by forming a single filter unit in which a metal lath plate having a mesh-shaped opening is held by a rectangular support frame into a single layer or multiple layers. There is a structure in which a flow path is formed [Japanese Patent Laid-Open No. 3-47509, Japanese Utility Model Laid-Open No. 3-949].
16 publication]. In this type of ventilation filter, the contaminated air generated by heating cooking in the range cooker and rising is collected by the rotation of the fan, and when the contaminated air passes through the opening of the metal lath plate, the opening is Since it is formed in the zigzag curved flow path, the contaminated medium contained in the contaminated air is adhered to and collected on the surface of the metal lath plate while passing through the curved flow path.

[0004]

Generally, the ventilation filter 4 needs to have an excellent smoke collecting and collecting function, so that it is necessary to secure an appropriate smoke collecting efficiency for contaminated air and a proper collecting efficiency for contaminated medium. I have to. If proper smoke collection efficiency cannot be obtained, it will be difficult to reliably collect contaminated air, and the kitchen will be filled with contaminated air, and proper collection efficiency will be obtained. Otherwise, it will be difficult to reliably collect the contaminated medium, and the hood 2, the fan 5 and the duct will be contaminated.

Here, even if the number of rotations of the fan 5 is increased in order to improve the smoke collecting efficiency of the ventilation filter 4,
It has been found that it is difficult to improve the smoke collection efficiency only by increasing the noise generated by the fan 5 to generate noise. In addition, for example, in the ventilation filter 4 having the metal lath structure described above, in order to improve the collection efficiency, it is necessary to consider the filter aperture ratio and the bending degree of the bent flow path.
However, if the filter aperture ratio is small and the degree of bending is large, the collection efficiency is high, but the contaminated medium that is collected easily causes clogging of the metal lath plate and easily changes over time.
Therefore, in addition to the above-mentioned filter aperture ratio and bending degree,
The rate of change over time must also be taken into account.

As described above, in general, in order to set the smoke collection and collection efficiency in the ventilation filter 4 to appropriate values, the filter aperture ratio, the bending degree of the bent flow path, and the temporal change rate must be taken into consideration. In addition, it is the current situation that the basis of the decisive factor in considering these conditions remains unclear, and the ventilation filter 4 is not properly designed.

Therefore, the present invention has been proposed in view of the above-mentioned problems, and an object thereof is to provide a ventilation filter for a kitchen capable of efficiently collecting contaminated air and reliably collecting a contaminated medium. And a method for designing a ventilation filter for a kitchen, in which the basis for considering various conditions for appropriately setting smoke collection and collection efficiency in the ventilation filter is clarified.

[0008]

As a technical means for achieving the above-mentioned object, a ventilation filter for a kitchen according to the present invention comprises a plurality of columnar members each having a V-shaped cross section and having a predetermined angle. The two types of fence-shaped filter units, which are parallelly arranged at a predetermined pitch along the direction and are held by a rectangular support frame, are alternately laminated in a plurality of stages along the thickness direction. It is characterized in that a columnar member of a single filter is arranged with a step between adjacent columnar members to form a zigzag bent flow path through which contaminated air passes.

Further, the method of designing a ventilation filter for a kitchen according to the present invention comprises two types of columnar members having a V-shaped cross section arranged in parallel at a constant pitch along the width direction and held by a rectangular support frame. Fence-shaped filter units are stacked in multiple layers alternately in the thickness direction, and the columnar members of the other filter unit are arranged with a step between adjacent columnar members of one filter unit, and contaminated air passes through. A method of designing a filter having a zigzag bent channel, which is generated due to the passage resistance of contaminated air in the bent channel and the pressure difference between the inside and outside of the hood based on the filter surface area, based on the fan air volume and total pressure. The suction side dynamic pressure higher than the flow velocity of polluted air is determined in relation to the smoke collection and collection efficiency, and based on the suction side dynamic pressure and the smoke collection and collection efficiency, the columnar members arranged in the width direction of the filter unit are determined. Array pitch, The arrangement pitch of the columnar member arranged in the thickness direction of, is characterized in that so as to set the angle formed with V-shaped columnar member.

Further, in another method for designing a ventilation filter for a kitchen according to the present invention, a single filter having a metal lath plate having a mesh-shaped opening portion held by a rectangular support frame is formed in a single layer or a plurality of layers so that polluted air is prevented. A method of designing a filter that forms a zigzag bent flow path that passes through, and is generated due to the passage resistance of contaminated air in the bent flow path and the difference in air pressure inside and outside the hood from the filter surface area, with reference to the fan air volume and total pressure The suction side dynamic pressure above the flow velocity of the polluted air is determined in relation to the smoke collection and collection efficiency, and based on the suction side dynamic pressure, smoke collection and collection efficiency, and the change rate with time, the filter opening ratio and bending It is characterized in that the bending degree of the flow path is set.

[0011]

The ventilation filter for the kitchen according to the present invention has a cross section V
By combining a plurality of columnar members having a character shape with a predetermined positional relationship, when the contaminated air passes through the zigzag curved flow path, the contaminated medium contained in the contaminated air is condensed on the outer surface of the columnar member. The polluted medium is deposited and collected, and the collected polluted medium does not fall below the ventilation filter and is dropped and accumulated inside the columnar member located immediately below the columnar member that trapped the polluted medium. . Moreover, by combining the above-mentioned columnar members, it becomes difficult to cause a change with time due to clogging.

Further, in the method for designing a ventilation filter for a kitchen according to the present invention, both the ventilation filter having the above-described structure and the ventilation filter having the metal lath structure have a curved flow path based on the air volume and the total pressure of the fan. The suction side dynamic pressure, which is higher than the flow velocity of the polluted air generated by the pressure difference between the inside and the outside of the hood, is determined from the passage resistance of the polluted air and the filter surface area in association with the smoke collection and collection efficiency. In this way, focusing on the suction side dynamic pressure generated in the ventilation filter based on the passage resistance of the contaminated air and the filter surface area, it is possible to improve the smoke collection and collection efficiency by setting the appropriate suction side dynamic pressure. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a kitchen ventilation filter and its designing method according to the present invention will be described with reference to FIGS.

First, the kitchen ventilation filter of the present invention will be described in detail below. 1 (a) (b) and 2 (a)
As shown in (b), a plurality of columnar members 12a and 12b having a V-shaped cross section are provided at constant pitches Pa and P along the width direction thereof.
Two kinds of fence-shaped filter units 14a and 14b, which are arranged in parallel at b and held by the rectangular support frame 13, are prepared. The arrangement pitch Pa of the columnar members 12a in the one filter unit 14a shown in FIGS. 1A and 2A and FIGS. 1B and 2
The columnar member 1 in the other filter unit 14b shown in (b)
The arrangement pitch Pb of 2b is the same, and the columnar member 12a of one filter unit 14a is the other filter unit 14a.
By shifting from the columnar member 12b of b by half pitch,
The other columnar member 1 is provided at an intermediate position between the one columnar member 12a.
2b will be located.

As shown in the development view of FIG. 3, the columnar members 12a and 12b constituting each filter unit 14a and 14b are formed by integrally forming projecting pieces 16 on both ends of a long flat plate-like member 15, The member 15 is formed by bending the member 15 in a V shape along the center and bending the protrusion 16 inward. On the other hand, on the inner surface of the opposite side of the rectangular support frame 13 where the columnar members 12a and 12b are arranged, a stopper 17 having an inverted V shape for regulating the positions of the columnar members 12a and 12b is formed [see FIG. 2]. Then, the protrusions 16 of the columnar members 12a and 12b are fixed by welding or the like while the positions of the protrusions 16 of the rectangular support frame 13 are regulated by the stoppers 17 to manufacture the filter units 14a and 14b.

The above-mentioned rectangular support frame 13 is manufactured by forming the members forming each side into a rectangular shape and connecting the four corners with rivets etc. to integrate them. , The filter unit 14a, 1 will be described later.
There is a through hole 19 bored for inserting a screw 18 that connects and integrates the filter units 14a and 14b when 4b are stacked [see FIG. 1].

As shown in FIGS. 4 and 5, one filter unit 14a and the other filter unit 14b are alternately arranged in a plurality of stages along the thickness direction (for example, six stages in the figures).
Each filter unit 14a, 14
The ventilation filter 11 is manufactured by inserting the screws 18 into the through holes 19 communicating with each other at the four corners of b to integrally connect the filter units 14a and 14b. As a result, the columnar member 12a of the one filter unit 14a and the columnar member 12b of the other filter unit 14b are arranged with a step difference corresponding to the filter unit between the adjacent columnar members 12a and 12b. The columnar members 12a and 12b
The ventilation filter 11 is formed with a zigzag-shaped bent flow path 20 through which the contaminated air passes due to the arrangement relationship of.

In the above embodiment, one filter unit 14 is used.
Although the one-stage columnar members 12a and 12b are arranged on the a and 14b, the present invention is not limited to this. For example, as shown in FIG. 6, the two-stage columnar members having the above-mentioned arrangement pattern. The members 12a and 12b may be formed by a single filter 14 'held by one rectangular support frame 13'. In this way, ventilation filter 1
Only one type of the filter unit 14 that composes 1 is required.
The number of layers can be half that of the above-mentioned embodiment [three stages in the figure].

As in the conventional case, the ventilation filter 11 having the above structure is attached to and detached from the opening 3 of the hood 2 of the range hood ventilation fan arranged above the range cooker 1 installed in a kitchen as shown in FIG. It is installed freely. The ventilation filter 11 attached to the hood 2 collects contaminated air such as smoke and steam generated by heating and cooking in the range cooker 1 by the rotation of the fan 5, and each filter unit 1
While passing through the zigzag bent flow path 20 formed by the columnar members 12a and 12b of 4a and 14b, the pollutant medium such as soot and oil mist (small oil particles) contained in the contaminated air is filtered. It collects by aggregating on the outer surfaces of 12a and 12b.

In the ventilation filter 11 of the present invention, even if the contaminated condensing medium drops on the outer surfaces of the columnar members 12a and 12b, the columnar member 12a of the one filter unit 14a.
Since the columnar member 12b of the other filter unit 14b is located immediately below, the contaminated medium is dropped inside the columnar members 12a and 12b and stored therein, and is dropped to the range cooker 1 to pollute the range cooker 1. There is no. Although the columnar members 12a and 12b located at the bottom are not shown,
If the columnar members 12a and 12b are arranged with a slight inclination in the longitudinal direction and a saucer is attached to the lower end portion thereof, the polluted medium agglomerated on the outer surfaces of the columnar members 12a and 12b moves downward and inclines. It can be collected in a tray. Since the columnar members 12a and 12b having a V-shaped cross section are arranged in a plurality of stages in the arrangement pattern described above, clogging by the contaminated medium does not occur when compared with the conventional metal lath structure, Less likely to change over time.

Here, the inventor has found that the suction side dynamic pressure (orifice effect) generated in the ventilation filter 11 is
We focused on the fact that it is an important factor in designing 1. That is, as shown in FIG. 7, the inside of the hood 2 is in a negative pressure state due to the discharge of the contaminated air due to the rotation of the fan 5, and the same amount of the contaminated air as the discharge amount of the contaminated air enters the hood 2 through the ventilation filter 11. The hood 2 flows into the hood 2 at this time due to the passage resistance of the contaminated air in the bent flow path 20 in the ventilation filter 11.
Atmospheric pressure difference is generated between the inside and outside, and on the basis of this, a suction side dynamic pressure is generated in the ventilation filter 11. This suction side dynamic pressure is generated from the passage resistance and the filter surface area of the contaminated air in the bent flow passage 20 in the ventilation filter 11, while the contaminated medium such as oil mist is contaminated air in the passage process in the bent flow passage 20. Due to contact or collision due to a difference in inertia between the columnar members 12a and 12b, they are aggregated and collected.

In the ventilation filter 11 that collects the contaminated air generated by heating in the range cooker 1 and rising due to the rotation of the fan 5, the amount of contaminated air generated, the viscosity, and the rising speed are proportional to the amount of heat. Since the air pressure increases and rises, in order to release the viscosity of the polluted air and capture the polluted air with high smoke collection efficiency, a suction side dynamic pressure that is higher than the rising speed of the polluted air is required. For example, the rising speed of polluted air is 0.4 per second.
When set to 0.8 m, the suction side dynamic pressure of the ventilation filter 11 requires a flow velocity of 0.4 to 0.8 m / sec or more. Thus, if the suction side dynamic pressure is higher than the rising speed of the polluted air, the polluted air can be captured with high smoke collection efficiency, the polluted air does not fill the kitchen, and the bent channel 20 is used. Complete ventilation can be realized by collecting the polluted medium in the passage process of (1) and discharging the purified air by the rotating force of the fan (5).

Therefore, in the ventilation filter 11 in which the columnar members 12a and 12b having a V-shaped cross section are combined in a predetermined arrangement relationship over a plurality of stages as in the above-described embodiment, smoke collection and collection efficiency are improved. An important element is the columnar member 12 arranged in the width direction of the filter units 14a and 14b.
The arrangement pitch of a and 12b, the arrangement pitch of the columnar members 12a and 12b arranged in the thickness direction, and the columnar members 12a and 1
2b is a V-shaped angle, and these are set by the following design method.

That is, with reference to the air volume and the total pressure of the fan 5, the suction side dynamic pressure that is equal to or higher than the flow velocity of the contaminated air generated due to the passage resistance of the contaminated air in the bent channel 20 and the pressure difference between the inside and outside of the hood 2 from the filter surface area. Of the columnar members 12a and 12b arranged in the width direction of the filter units 14a and 14b based on the suction side dynamic pressure and the smoke collection and collection efficiency. , Horizontal arrangement pitch], and the columnar members 12a, 1 arranged in the thickness direction thereof.
2b array pitch [hereinafter referred to as vertical array pitch],
The angle forming the V-shape of the columnar members 12a and 12b [hereinafter, V
It is called an angle].

The relationship between the passage resistance, the suction side dynamic pressure, the smoke collecting efficiency and the trapping efficiency will be described below based on a specific example in which the horizontal arrangement pitch, the vertical arrangement pitch and the V angle of the columnar members 12a and 12b are different.

For example, FIG. 8 shows two examples in which the horizontal arrangement pitch is changed. (A) shows a case where the horizontal arrangement pitch is 30 mm, the vertical arrangement pitch is 10 mm, and the V angle is 75 °, and (b) shows the horizontal arrangement. This is a case where the pitch is 40 mm, the vertical arrangement pitch is 10 mm, and the V angle is 75 °. Comparing these two examples,
In (a), the passage resistance and the suction side dynamic pressure are large, and the smoke collection and collection efficiency is high, whereas in (b), the passage resistance and the suction side dynamic pressure are small, and the smoke collection and collection efficiency is low. Become.

FIG. 9 shows two examples in which the vertical arrangement pitch is changed. (A) shows a case where the horizontal arrangement pitch is 40 mm, the vertical arrangement pitch is 10 mm, and the V angle is 90 °. (B) shows the horizontal arrangement pitch. 40 mm, vertical arrangement pitch 20 mm, V angle 9
This is the case of 0 °. Comparing these two examples, in (a), the passage resistance and suction side dynamic pressure are large, and the smoke collection and collection efficiency is high, whereas in (b), the passage resistance and suction side dynamic pressure are small, and Low smoke and collection efficiency. Incidentally, FIG.
In (b), 21 is a rectangular frame-shaped spacer inserted between the filter units 14a and 14b to change the vertical arrangement pitch.

FIG. 10 shows an example in which the horizontal arrangement pitch and the V angle are changed, and the horizontal arrangement pitch is 20 mm, the vertical arrangement pitch is 10 mm, and the V angle is 55 °. In this case, although the horizontal arrangement pitch is smaller than that in the above example, the V angle is small, so the passage resistance and the suction side dynamic pressure are small, and the smoke collection and collection efficiency is low. .

Based on the above relationship, experimentally, by setting the horizontal array pitch, the vertical array pitch and the V angle of the columnar members 12a and 12b to various values, among them,
Determine the desired suction side dynamic pressure and select a value that gives high smoke collection and collection efficiency. As shown in FIG. 11, if the folded portions 22 are formed along both side edges of the columnar members 12a and 12b, it becomes possible to increase the passage resistance when the contaminated air passes through the bent flow passage 20.

The method of designing this ventilation filter 11 is not limited to one comprising a plurality of filter units 14a and 14b in which the above-mentioned columnar members 12a and 12b having a V-shaped cross section are combined, but a conventional metal lath structure, that is, It is also applicable to a ventilation filter that forms a zigzag bent flow path through which contaminated air passes by forming a single filter unit that holds a metal lath plate having a mesh-shaped opening with a rectangular support frame in a single layer or multiple layers, In that case, based on the air volume and total pressure of the fan, the suction side dynamic pressure higher than the flow velocity of the contaminated air generated due to the passage resistance of the contaminated air in the curved flow path and the pressure difference between the inside and outside of the hood due to the filter surface area is collected and collected. It is determined in relation to the collection efficiency, and the filter opening ratio and the bending degree of the bent flow path are set based on the suction side dynamic pressure, the smoke collection and collection efficiency, and the change rate with time.

Since the ventilation filter 11 of the present invention has a structure in which a plurality of filter units 14a and 14b in which a plurality of columnar members 12a and 12b are arranged at a constant pitch are laminated in a plurality of stages, it is possible to perform periodic cleaning or replacement. , Each filter alone 14
By removing the screw 18 for connecting and integrating a and 14b, each filter unit 14a, 14b can be easily disassembled, and each filter unit 14a, 14b can be washed or replaced individually. Single 14
Also for cleaning a and 14b, the columnar members 12a and 12b
Since they are arranged at a constant pitch, a very simple and good cleaning effect can be obtained.

[0032]

According to the ventilation filter for the kitchen of the present invention,
It is possible to reliably collect the contaminated medium contained in the contaminated air without dropping it, it is less likely to change over time due to clogging, the frequency of replacement or cleaning can be reduced, and a comfortable kitchen environment can be created. . Further, according to the designing method of the present invention, by determining the suction side dynamic pressure required for the kitchen ventilation filter, it is possible to provide a ventilation filter having high smoke collection efficiency and collection efficiency without waste, and energy saving. As a part of this, it is possible to standardize the proper amount of exhaust air, the suction side dynamic pressure, and the collection efficiency based on the heat quantity of the range cooker.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing one filter unit constituting the ventilation filter of the present invention, and FIG. 1 (b) is a plan view showing the other filter unit.

FIG. 2A is a partial cross-sectional view showing one filter unit of FIG. 1A, and FIG. 2B is a partial cross-sectional view showing the other filter unit of FIG. 1B.

FIG. 3 is a development view of one columnar member.

FIG. 4 is a side view showing a state in which filter units are stacked.

FIG. 5 is a cross-sectional view showing a state in which a single filter is stacked.

FIG. 6 is a partial cross-sectional view showing a modified example of a single filter.

FIG. 7 is a schematic configuration diagram showing a range hood ventilation fan using the ventilation filter of the present invention.

8A is a partial cross-sectional view showing a specific example in which a single filter is laminated, and FIG. 8B is a partial cross-sectional view showing a state in which the horizontal arrangement pitch of the columnar members of FIG. 8A is changed.

9A is a partial cross-sectional view showing another specific example in which a single filter is laminated, and FIG. 9B is a partial cross-sectional view showing a state in which the vertical arrangement pitch of the columnar members of FIG. 9A is changed.

FIG. 10 is a partial cross-sectional view showing a state in which the V angle and the horizontal array pitch of the columnar member are changed.

FIG. 11 is a partial cross-sectional view showing an example in which folded portions are formed on both side edges of a columnar member.

FIG. 12 is a schematic configuration diagram of a range hood ventilation fan.

[Explanation of Codes] 11 Ventilation filter for kitchen 12a, 12b Columnar member 13 Rectangular support frame 14a, 14b Filter unit 20 Bent flow path

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[Procedure amendment]

[Submission date] March 10, 1995

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title : Suction device for local ventilation and method of designing the same

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction device for local ventilation and a method for designing the suction device, and more particularly to a range hood installed in a kitchen for the purpose of local ventilation for general households and businesses. Do not use a filter that is detachably attached to the ventilation fan.
The present invention relates to a suction device for local ventilation and its design method.

[0002]

2. Description of the Related Art A hood and a fan are used as a means for exhausting smoke and steam containing oil generated from a range cooker installed in a kitchen, etc., which is used for the purpose of local ventilation for general households and businesses. There is a range hood ventilation fan that integrates and. This range hood ventilation fan is generally arranged above a range cooker 1 installed in a kitchen as shown in FIG. 12, and has a structure in which a filter 4 is detachably attached to an opening 3 of the hood 2. Is. Hood 2 mentioned above
The filter 4 mounted on the exhaust gas collects contaminated air such as smoke and steam generated by heating and cooking in the range cooker 1 by the rotation of the fan 5, and the soot contained in the contaminated air. Contamination media such as oil mist (small oil particles) are collected to prevent dirt from adhering to the hood 2, the fan 5 and the duct.

Specifically, the filter 4 is a zigzag-shaped bending flow through which contaminated air passes by forming a single filter or single layer in which a metal lath plate having a mesh-shaped opening is held by a rectangular support frame. There is a structure in which a path is formed [Japanese Patent Laid-Open No. 3-47509 and Japanese Utility Model Laid-Open No. 3-94916.
Gazette]. In this type of filter, the contaminated air generated by heating in the range cooker and rising is collected by the rotation of the fan, and when the contaminated air passes through the opening of the metal lath plate, the opening zigzag. Since it is formed in a curved flow path, the contaminated medium contained in the contaminated air is adhered to and collected on the surface of the metal lath plate while passing through the curved flow path.

[0004]

Generally, the filter 4
Requires excellent smoke collection and collection functions, so it is necessary to secure appropriate smoke collection efficiency for contaminated air and collection efficiency for contaminated media. If proper smoke collection efficiency cannot be obtained, it will be difficult to reliably collect contaminated air, and the kitchen will be filled with contaminated air, and proper collection efficiency will be obtained. Otherwise, it will be difficult to reliably collect the contaminated medium, and the hood 2, the fan 5 and the duct will be contaminated.

Here, even if the number of rotations of the fan 5 is increased in order to improve the smoke collecting efficiency of the filter 4, the noise generated by the fan 5 increases and becomes a noise in the room.
It has been found that it is difficult to improve the smoke collection efficiency only by discharging a large amount of clean air . Further, for example, in the filter 4 having a metal lath structure, in order to improve the collection efficiency, it is necessary to consider the filter aperture ratio and the bending degree of the bent flow path. However, if the filter aperture ratio is small and the degree of bending is large, the collection efficiency is high, but the contaminated medium that is collected easily causes clogging of the metal lath plate and easily changes over time. Therefore, in addition to the above-described filter aperture ratio and bending degree, the rate of change with time must be taken into consideration.

As described above, in general, in order to set the smoke collection and collection efficiency of the filter 4 to appropriate values, it is necessary to consider the filter aperture ratio, the bending degree of the bent flow path, and the rate of change over time. In addition, it is the current situation that the basis of the decisive factor in considering these various conditions remains unclear and the filter 4 is not designed properly.

Therefore, the present invention has been proposed in view of the above problems, and an object thereof is to efficiently collect polluted air and surely collect a polluted medium.
To provide a suction device for local ventilation and to provide a method for designing a suction device for local ventilation in which the basis for considering various conditions for properly setting smoke collection and collection efficiency is clarified. is there.

[0008]

As a technical means for achieving the above-mentioned object, the suction for local ventilation according to the present invention
The apparatus comprises two types of fence-shaped filters each having a plurality of columnar members each having a V-shaped cross section and having a predetermined angle arranged in parallel along a width direction thereof at a predetermined pitch and held by a rectangular support frame. Zigzag through which contaminated air passes by arranging a plurality of columns alternately along one another, and disposing the columnar member of one filter unit and the columnar member of the other filter unit with a step between adjacent columnar members. Fi forming the Jo bent flow path
It is characterized by being configured with a computer .

The method for designing a suction device for local ventilation according to the present invention is of two types in which a plurality of columnar members having a V-shaped cross section are arranged in parallel at a constant pitch along the width direction and held by a rectangular support frame. The fence-shaped filter unit is laminated in multiple layers alternately in the thickness direction, and the columnar member of the other filter unit is arranged with a step between the adjacent columnar members of the one filter unit, thereby contaminated air a method of designing a suction device comprising a filter to form a zigzag bent flow path through, based on the air volume and the total pressure of the fan, the bent flow path shape
The suction velocity pressure or flow rate of the contaminated air generated from the flow path area of the filter was made by pressure difference between the hood and out to determine in conjunction with the smoke collecting and trapping efficiency, smoke collecting and collecting its suction velocity pressure On the basis of efficiency, the arrangement pitch of the columnar members arranged in the width direction of the filter unit, the arrangement pitch of the columnar members arranged in the thickness direction thereof, and the V-shaped angle of the columnar members are set. And

Further, in another method for designing a suction device for local ventilation according to the present invention, a single filter or a multi-layer filter unit in which a metal lath plate having a mesh-shaped opening is held by a rectangular support frame is formed into a contaminated air. A method of designing a suction device comprising a filter having a zigzag bent flow path through which a
A bent flow path is formed based on the air volume and total pressure of the fan.
The suction velocity pressure or flow rate of the contaminated air from the passage area caused by the pressure difference between the hood and out of the filter in conjunction with the smoke collecting and trapping efficiency determined, the suction velocity pressure and smoke collecting and trapping efficiency The filter opening ratio and the bending degree of the bent flow path are set based on the rate of change over time.

[0011]

In the suction device for local ventilation according to the present invention, the cross section V is
By combining a plurality of columnar members having a character shape with a predetermined positional relationship, when the contaminated air passes through the zigzag curved flow path, the contaminated medium contained in the contaminated air is condensed on the outer surface of the columnar member. The polluted medium is deposited and collected, and the collected contaminated medium is not dropped below the filter but is dropped and accumulated inside the columnar member located immediately below the columnar member that has collected the contaminated medium. Moreover, by combining the above-mentioned columnar members, it becomes difficult to cause a change with time due to clogging.

Further, in the method for designing the suction device for local ventilation according to the present invention, in any of the filters having the above-described structure or the metal lath structure, the filter having the bent flow path is formed on the basis of the air volume and the total pressure of the fan. The suction speed pressure higher than the flow velocity of the contaminated air generated due to the pressure difference between the inside and the outside of the hood is determined from the flow path area in relation to the smoke collection and collection efficiency. Thus focusing on the suction velocity pressure generated in the filter based on the flow passage area of the filter, it is possible to increase the condensing smoke and trapping efficiency by an appropriate suction speed pressure.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a local ventilation suction device and its designing method according to the present invention will be described with reference to FIGS.
In addition, hereinafter, the suction device for local ventilation of the present invention will be referred to as a kitchen range.
The case where it is applied to a hood ventilation fan will be described in detail below.

As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, a plurality of columnar members 12a having a V-shaped cross section,
Two types of fence-shaped filter units 14a and 14b in which 12b are arranged in parallel along the width direction at constant pitches Pa and Pb and held by a rectangular support frame 13 are prepared. 1 (a) and 2
Columnar member 1 with one filter unit 14a shown in (a)
The arrangement pitch Pa of 2a and the arrangement pitch Pb of the columnar members 12b in the other filter unit 14b shown in FIGS. 1B and 2B are the same, and one filter unit 14a
By shifting the columnar member 12a from the columnar member 12b of the other filter unit 14b by a half pitch, the other columnar member 12b is positioned at an intermediate position between the one columnar member 12a.

As shown in the development view of FIG. 3, the columnar members 12a and 12b constituting each filter unit 14a and 14b are formed by integrally forming projecting pieces 16 on both ends of a long flat plate-like member 15, The member 15 is formed by bending the member 15 in a V shape along the center and bending the protrusion 16 inward. On the other hand, on the inner surface of the opposite side of the rectangular support frame 13 where the columnar members 12a and 12b are arranged, a stopper 17 having an inverted V shape for regulating the positions of the columnar members 12a and 12b is formed [see FIG. 2]. Then, the protrusions 16 of the columnar members 12a and 12b are fixed by welding or the like while the positions of the protrusions 16 of the rectangular support frame 13 are regulated by the stoppers 17 to manufacture the filter units 14a and 14b.

The above-mentioned rectangular support frame 13 is manufactured by forming the members forming each side into a rectangular shape and connecting the four corners with rivets etc. to integrate them. , The filter unit 14a, 1 will be described later.
There is a through hole 19 bored for inserting a screw 18 that connects and integrates the filter units 14a and 14b when 4b are stacked [see FIG. 1].

As shown in FIGS. 4 and 5, one filter unit 14a and the other filter unit 14b are alternately arranged in a plurality of stages along the thickness direction (for example, six stages in the figures).
Each filter unit 14a, 14
A filter 11 constituting a suction device for local ventilation by inserting screws 18 into through holes 19 communicating at the four corners of b to connect and integrate the filter units 14a and 14b.
To produce. As a result, the columnar member 12a of the one filter unit 14a and the columnar member 12b of the other filter unit 14b are arranged with a step difference corresponding to the filter unit between the adjacent columnar members 12a and 12b.
Due to the positional relationship of the columnar members 12a and 12b, the filter 11 has a zigzag bent flow path 2 through which contaminated air passes.
0 is formed.

In the above embodiment, one filter unit 14 is used.
Although the one-stage columnar members 12a and 12b are arranged on the a and 14b, the present invention is not limited to this. For example, as shown in FIG. 6, the two-stage columnar members having the above-mentioned arrangement pattern. The members 12a and 12b may be formed by a single filter 14 'held by one rectangular support frame 13'. By doing so, only one type of the filter unit 14 that constitutes the filter 11 is required, and the number of laminated layers can be half that of the above-described embodiment (three stages in the figure).

As in the conventional case, the filter 11 having the above-mentioned structure is attachable / detachable to / from the opening 3 of the hood 2 of the range hood ventilation fan arranged above the range cooker 1 installed in the kitchen as shown in FIG. Be attached to. The filter 11 mounted on the hood 2 collects contaminated air such as smoke and steam generated by heating and cooking in the range cooker 1 by the rotation of the fan 5, and each filter unit 14a, 1
While passing through the zigzag bent flow path 20 formed by the columnar members 12a and 12b of 4b, pollutant media such as soot and oil mist (small oil particles) contained in the contaminated air are removed from the columnar members 12a, Collect on the outer surface of 12b by aggregating.

In the filter 11, the columnar members 12a, 12
Even if the contaminated contaminated medium drops on the outer surface of b, since the columnar member 12b of the other filter unit 14b is positioned immediately below the columnar member 12a of the one filter unit 14a, the contaminated medium is not contaminated by the columnar members 12a and 12b. It is dripped inside and stored, and it drops to the range cooker 1 and the range cooker 1
Does not pollute. The columnar member 12 located at the bottom
Although not shown, a and 12b are columnar members 12
If the a and 12b are arranged with a slight inclination in the longitudinal direction and a saucer is attached to the lower end thereof, the columnar members 12a, 12b
The contaminated medium that has aggregated on the outer surface of 12b moves along the downward slope and can be collected by the pan. Since the columnar members 12a and 12b having a V-shaped cross section are arranged in a plurality of stages in the arrangement pattern described above, clogging by the contaminated medium does not occur when compared with the conventional metal lath structure, Less likely to change over time.

Here, the present inventor has noticed that the suction velocity pressure [orifice effect or nozzle effect ] generated in the filter 11 is an important factor in designing the filter 11.

That is, the range hood ventilation fan is a fan.
And a suction device that is a filter.
Between the discharge function of the discharge device and the suction function of the suction device
Sum is the basis of local ventilation. Therefore, the suction device is
What is suitable for the discharge capacity of the discharge device is required.

As shown in FIG. 7, the inside of the hood 2 is in a negative pressure state due to the discharge of the polluted air by the rotation of the fan 5, and the same amount of polluted air as the discharge amount of this polluted air enters the hood 2 through the filter 11. It flows in, and at this time, an atmospheric pressure difference is generated between the inside and outside of the hood 2, and on the basis of this, a suction speed pressure is generated in the filter 11. The suction speed pressure, file
The bent flow path 20 is formed on the basis of the air volume and total pressure of the inlet 5.
It is generated from the flow path area of the filtered filter 11 . On the other hand, contaminated medium such as oil mist is collected and aggregated on the outer surfaces of the columnar members 12a and 12b due to contact, collision and the like due to a difference in inertia with the contaminated air in the course of passage through the curved flow path 20.

In the filter 11 which collects the contaminated air generated by heating in the range cooker 1 and rising by the rotation of the fan 5, the amount of polluted air generated, the viscosity, and the rising speed increase in proportion to the amount of heat. Therefore, in order to release the viscosity of the contaminated air and capture the contaminated air with high smoke collection efficiency, a suction speed pressure higher than the rising speed of the contaminated air is required. For example, the rising speed of polluted air is 0.4 to
If it is 0.8 m, the suction speed pressure of the filter 11 needs a flow velocity of 0.4 to 0.8 m / sec or more. That is, high speed
And the air volume of the fan with the two speed difference of low speed is in one hour
If the ejection amount of 300 meters ^3, the filter is a suction device
The surface area is 700 cm ² and the flow path area is 100 cm ² .
And, the trapped air flow velocity becomes about 0.833 m / sec,
Approximately 1.66 per second at a high discharge rate of 600 m ³ / hour
m.

As described above, the suction speed of the polluted air is higher than the rising speed.
Pollution that rises while being induced in the hood if there is velocity pressure
It captures air without catching the surface area of the filter.
Cleans by sucking and sucking and flowing at a low speed due to the difference in flow speed
Air contamination is suppressed to a minimum , polluted air can be captured with high smoke collection efficiency, the polluted air does not fill the kitchen, and the polluted medium is trapped during the passage process in the bent flow path 20. By exhausting the collected and purified air with the rotating force of the fan 5, complete ventilation without waste can be realized.

Therefore, in the filter 11 in which the columnar members 12a and 12b having a V-shaped cross section are combined in a predetermined arrangement relationship over a plurality of stages as in the above-described embodiment, it is important in improving smoke collecting and collecting efficiency. The different elements are the columnar members 12a, 1 arranged in the width direction of the single filters 14a, 14b.
The arrangement pitch of 2b and the columnar members 12 arranged in the thickness direction thereof
It is the arrangement pitch of a and 12b and the angle forming the V-shape of the columnar members 12a and 12b, which are set by the following design method.

That is, with reference to the air volume and the total pressure of the fan 5, the flow velocity of the contaminated air generated by the pressure difference inside and outside the hood 2 from the flow passage area of the filter 11 in which the bent flow passage 20 is formed is higher than The suction speed pressure is determined in relation to the smoke collection and collection efficiency, and based on the suction speed pressure and the smoke collection and collection efficiency,
A columnar member 1 arranged in the width direction of the single filters 14a and 14b
The arrangement pitch of 2a and 12b [hereinafter referred to as horizontal arrangement pitch], the arrangement pitch of the columnar members 12a and 12b arranged in the thickness direction thereof (hereinafter referred to as vertical arrangement pitch), and the V-shape of the columnar members 12a and 12b. Angle (hereinafter referred to as V angle).

The relationship between the flow passage area, the suction speed pressure, the smoke collecting efficiency and the trapping efficiency will be described below based on a specific example in which the horizontal arrangement pitch, the vertical arrangement pitch and the V angle of the columnar members 12a and 12b are different.

For example, FIG. 8 shows two examples in which the horizontal arrangement pitch is changed. (A) shows a case where the horizontal arrangement pitch is 30 mm, the vertical arrangement pitch is 10 mm, and the V angle is 75 °, and (b) shows the horizontal arrangement. This is a case where the pitch is 40 mm, the vertical arrangement pitch is 10 mm, and the V angle is 75 °. Comparing these two examples,
In (a), since the flow passage area is small, the suction speed pressure is large,
Smoke collecting and whereas the trapping efficiency is increased, the flow in (b)
Since the passage area is large, the suction speed pressure is small, and the smoke collection and collection efficiency is low.

FIG. 9 shows two examples in which the vertical arrangement pitch is changed. (A) shows a case where the horizontal arrangement pitch is 40 mm, the vertical arrangement pitch is 10 mm, and the V angle is 90 °, and (b) shows the horizontal arrangement pitch. 40 mm, vertical arrangement pitch 20 mm, V angle 9
This is the case of 0 °. Comparing these two examples, in (a)
Since the flow passage area is small, the suction velocity pressure is large and the smoke collection and collection efficiency is high, whereas in (b) the flow passage area is large.
Because of the threshold, the suction speed pressure is small, and the smoke collection and collection efficiency is low. In FIG. 9B, reference numeral 21 is a rectangular frame-shaped spacer inserted between the filter units 14a and 14b to change the vertical arrangement pitch.

FIG. 10 shows an example in which the horizontal arrangement pitch and the V angle are changed, and the horizontal arrangement pitch is 20 mm, the vertical arrangement pitch is 10 mm, and the V angle is 55 °. Incidentally, this
V angle is the friction coefficient of the flow path based on the total pressure of the fan
This is for the purpose of controlling the
It is something. In this case, although the horizontal arrangement pitch is smaller than that in the above example, the V angle is small, and thus the flow passage area is large and the suction speed pressure is small, and therefore the frictional resistance coefficient is also small. Small flow path loss
However, the smoke collection efficiency and collection efficiency are also reduced.

Based on the above relationship, the wind of the fan is experimentally set by setting the horizontal arrangement pitch, the vertical arrangement pitch and the V angle of the columnar members 12a and 12b to various values.
Friction resistance as a suction device adapted to volume and total pressure criteria
Number, smoke collection and collection efficiency, suction speed pressure . In addition, as shown in FIG. 11, it is also possible to form the folded portion 22 along both side edges of the columnar members 12a and 12b.

The method of designing the filter 11 is not limited to the one having a plurality of filter units 14a and 14b in which the columnar members 12a and 12b having the V-shaped cross section are combined, but the one having the conventional metal lath structure, that is, the mesh. It can also be applied to a filter that has a zigzag bent flow path through which contaminated air passes by forming a single filter unit that holds a metal lath plate with a rectangular support frame with a rectangular support frame in that case. Based on the fan air volume and total pressure,
Suction speed above the flow velocity of contaminated air generated by the pressure difference between the inside and outside of the hood due to the flow area of the filter with a bent flow path
The degree pressure determined in conjunction with the smoke collecting and trapping efficiency, the suction
The filter opening ratio and the bending degree of the bent flow path are set based on the velocity pressure, the smoke collection and collection efficiency, and the change rate with time.

The filter 11 includes a plurality of columnar members 12
Filter unit 14 in which a and 12b are arranged at a constant pitch 14
Since it has a structure in which a and 14b are laminated in a plurality of stages, each filter unit 14a and 14b can be easily disassembled by removing the screw 18 for connecting and integrating each filter unit 14a and 14b at the time of regular cleaning or replacement. You can
It is possible to clean or replace each of the filter units 14a and 14b, and the cleaning of each of the filter units 14a and 14b is very easy because the columnar members 12a and 12b are only arranged at a constant pitch. A good cleaning effect can be obtained.

Further , in the above-mentioned embodiment, it is installed in the kitchen.
Explained when applied to the range hood ventilation fan
However, the present invention can be used for other purposes such as dust removal.
be able to.

[0036]

According to the suction device for local ventilation of the present invention,
It is possible to reliably collect the contaminated medium contained in the contaminated air without dropping it, it is less likely to change over time due to clogging, the frequency of replacement or cleaning can be reduced, and a comfortable kitchen environment can be created. . Further, according to the design method of the present invention, the suction speed required for the suction device for local ventilation is
By determining the degree pressure, it is possible to provide a local ventilation suction apparatus having a lean high current smoke and trapping efficiency,
As a part of energy saving, it is possible to standardize the proper amount of exhaust air, the suction speed pressure, and the collection efficiency based on the heat quantity of the range cooker. Furthermore, a suction device in the room,
It becomes easy to install the discharge device separately in the outdoor,
A ventilation system without noise can be realized.

[Brief description of drawings]

FIG. 1A is a plan view showing one filter unit constituting a filter of the present invention, and FIG. 1B is a plan view showing the other filter unit.

FIG. 2A is a partial cross-sectional view showing one filter unit of FIG. 1A, and FIG. 2B is a partial cross-sectional view showing the other filter unit of FIG. 1B.

FIG. 3 is a development view of one columnar member.

FIG. 4 is a side view showing a state in which filter units are stacked.

FIG. 5 is a cross-sectional view showing a state in which a single filter is stacked.

FIG. 6 is a partial cross-sectional view showing a modified example of a single filter.

FIG. 7 is a schematic configuration diagram showing a range hood ventilation fan using the filter of the present invention.

8A is a partial cross-sectional view showing a specific example in which a single filter is laminated, and FIG. 8B is a partial cross-sectional view showing a state in which the horizontal arrangement pitch of the columnar members of FIG. 8A is changed.

9A is a partial cross-sectional view showing another specific example in which a single filter is laminated, and FIG. 9B is a partial cross-sectional view showing a state in which the vertical arrangement pitch of the columnar members of FIG. 9A is changed.

FIG. 10 is a partial cross-sectional view showing a state in which the V angle and the horizontal array pitch of the columnar member are changed.

FIG. 11 is a partial cross-sectional view showing an example in which folded portions are formed on both side edges of a columnar member.

FIG. 12 is a schematic configuration diagram of a range hood ventilation fan.

[Explanation of reference numerals] 11 filters 12a, 12b columnar members 13 rectangular support frames 14a, 14b single filter 20 bent channel

Claims (3)

[Claims] 1. A fence-type filter unit of two types in which a plurality of columnar members each having a V-shaped cross section forming a predetermined angle are arranged in parallel along a width direction thereof at a predetermined pitch and held by a rectangular support frame. By alternately stacking in multiple layers along the thickness direction, the columnar member of one filter unit and the columnar member of the other filter unit are arranged with a step between adjacent columnar members so that contaminated air passes. A ventilation filter for a kitchen, wherein a zigzag curved flow path is formed. 2. A plurality of columnar members each having a V-shaped cross section are arranged in parallel along the width direction at a constant pitch and are held by a rectangular support frame. Two types of fence filters are alternately arranged along the thickness direction. Of a filter having a zigzag-shaped bent channel through which contaminated air passes by arranging the columnar members of the other filter unit with a step between the adjacent columnar members of the one filter unit. The design method is based on the flow rate and total pressure of the fan, and collects the suction side dynamic pressure above the flow velocity of the contaminated air generated by the passage resistance of the contaminated air in the bent flow path and the pressure difference between the inside and outside of the hood from the filter surface area. Determined in relation to smoke and collection efficiency, based on the suction side dynamic pressure and smoke collection and collection efficiency, the arrangement pitch of the columnar members arranged in the width direction of the filter unit and the columnar members arranged in the thickness direction thereof. Array pitch and pillar Design method of kitchen ventilation filter being characterized in that so as to set the angle formed with V-shaped member. 3. A design of a filter in which a zigzag curved flow path through which contaminated air passes is formed by forming a single filter or single layer in which a metal lath plate having a mesh-shaped opening is held by a rectangular support frame into a single layer or multiple layers. A suction side dynamic pressure higher than the flow velocity of the contaminated air generated by the passage resistance of the contaminated air in the bent flow path and the pressure difference between the inside and outside of the hood due to the passage resistance of the contaminated air in the bent flow path, based on the fan air volume and total pressure. And the collection efficiency, and based on the suction side dynamic pressure, the smoke collection and collection efficiency, and the rate of change over time, the filter opening ratio and the bending degree of the bent flow path are set. Design method of ventilation filter for kitchen.