WO2022240229A1

WO2022240229A1 - Canopy hood local exhaustion device

Info

Publication number: WO2022240229A1
Application number: PCT/KR2022/006872
Authority: WO
Inventors: 오희범
Original assignee: 주식회사 토네이도시스템즈
Priority date: 2021-05-13
Filing date: 2022-05-13
Publication date: 2022-11-17
Also published as: KR20220154359A

Abstract

A canopy hood local exhaustion device comprises: a canopy hood including a horizontal portion coupled to the lower end of an exhaust duct and a through-hole formed in the center of the horizontal portion to be in communication with the exhaust duct; a vortex fan which is installed at the lower side of the through-hole of the canopy hood to be adjacent to the bottom surface of the horizontal portion; and a driving motor which is installed in the exhaust duct and is coupled to the vortex fan so as to rotate the vortex fan, wherein the horizontal portion is extended so that a distance from the circumference of the through-hole of the canopy hood to the circumference of the horizontal portion is one to ten times the inner diameter of the vortex fan.

Description

Canopy Hood Local Exhaust System

The present invention relates to a canopy hood local exhaust ventilation system installed in an exhaust duct.

In general, local exhaust systems are installed and used in various spaces such as houses, shopping malls, and factories to remove pollutants. For example, an exhaust device is used to discharge various contaminants generated during cooking in a kitchen, or dust, gas, oil mist, welding fumes, etc. generated at a work site to the outdoors.

These local exhaust systems include hoods, ducts, fans, air cleaners, stacks, etc. After the contaminants are collected, they are sent along the duct to the air purifier for treatment.

The hood serves to locally collect contaminants generated in the work process where overall ventilation is difficult, and becomes an inlet part of the local exhaust system. In particular, a canopy hood is suitable for work with hot ascending air currents. The canopy hood is mainly installed at the bottom of the exhaust duct in a circular or square cross-section shape, and is installed in a form that covers the top of the generating part of harmful pollutants or the top of the work table. do.

A blowing fan is installed at the rear end of the exhaust duct. The blower fan presumes that when the air is discharged through the exhaust duct by generating an air flow by the negative pressure created by driving the fan, the pollutants in the space will be carried in the air and discharged together. However, in order for pollutants having weight and volume to be discharged in the air, there must be an air flow velocity (hereinafter, 'flow velocity', velocity) greater than the gravity and inertia of the pollutant at the location where the pollutant is located. If the flow rate created by the blowing fan is low, the contaminants are not discharged in the air and instead of staying in place, only light air is discharged.

For this reason, there is a disadvantage in that pollutants cannot be discharged properly with the exhaust duct to which the existing blower fan and canopy hood are applied. That is, referring to the simulation figure of FIG. 1 (exhaust air volume 353㎥/h), the pollutant collection range of the exhaust duct 200 to which the existing blowing fan and canopy hood 10 are applied is adjacent to the inlet of the canopy hood 10. Therefore, pollutants cannot be discharged properly because the efficiency of actually sucking pollutants into the hood is significantly low in a work site where the hood cannot be brought close to the pollutant discharge equipment. As confirmed in FIG. 1 , only a portion of the canopy hood may be sucked in between the positions about 140 mm downward from the lower end of the canopy hood.

For reference, in the Republic of Korea Patent Application No. 10-2021-0061783 (filed on May 13, 2021), which is the priority basis of this international application, the simulation drawings of FIGS. 1, 7, 8, and 9 are attached in color, but only black and white drawings under PCT regulations. Since it is possible to submit, a black and white drawing is attached in this specification.

However, since there is no color display in the drawing, it is not clear to distinguish the areas. In FIG. 1, the flow velocity in the region marked E is the slowest (the part around 0.100 [m/s] in the lower left spectrum), D (the part around 2.900 [m/s] in the lower left spectrum), and C (the part around 2.900 [m/s] in the lower left spectrum). The flow velocity gradually increases towards the regions marked by 4.580 [m/s]), B (the part around 6.260 [m/s] in the lower left spectrum), and A (the part around 8.500 [m/s] in the lower left spectrum). .

Specifically, the area marked A indicates an area where the flow velocity is approximately 7 m/s to 8.5 ms/s, the area marked B indicates an area where the flow velocity is approximately 5.7 m/s to 6.9 ms/s, and the area marked C indicates a region where the flow velocity is approximately 2.9 m/s to 5.6 ms/s. In addition, the area marked with D indicates an area in which the flow velocity is approximately 1.8 m/s to 2.8 ms/s, and the area marked with E indicates an area in which the flow velocity is approximately 0.1 m/s to 1.7 ms/s.

A technical problem of the present invention is to provide a canopy hood local exhaust ventilation system in which a contaminant collection area is expanded and efficiency is improved compared to the prior art.

In order to achieve the above technical problem, the present invention is a canopy hood having a horizontal portion coupled to the lower end of an exhaust duct and a through hole formed in the center of the horizontal portion to communicate with the exhaust duct; a vortex fan installed below the through hole of the canopy hood to be adjacent to the lower surface of the horizontal portion; and a drive motor installed inside the exhaust duct and coupled to the vortex fan to rotate the vortex fan, wherein a distance from a circumference of the through hole of the canopy hood to a circumference of the horizontal portion is an inner diameter of the vortex fan. It provides a canopy hood local exhaust system, characterized in that the horizontal portion is extended and formed so that it is more than 1 times and less than 10 times of.

According to one feature, the canopy hood may further include an inclined portion extending obliquely at a predetermined angle downward from the circumference of the horizontal portion.

According to another feature, the canopy hood may further include a vertical portion extending in a direction perpendicular to the horizontal portion from a lower end of the inclined portion.

According to another feature, the canopy hood may further include a flange portion extending outward from a lower end of the inclined portion in a direction parallel to the horizontal portion.

According to another feature, the canopy hood further includes a vertical portion extending in a vertical direction downward from the circumference of the horizontal portion, and the distance from the circumference of the through hole to the circumference of the horizontal portion is 4 to 4 of the inner diameter of the vortex fan. It can be between 5 times.

According to another feature, it further includes a motor bracket coupled to the canopy hood to support the drive motor, wherein the motor bracket includes a body portion coupled to one surface of the drive motor, and is bent along the circumference of the body portion. and may include four bent bars whose ends are coupled to the outside of the rim of the through hole.

According to the canopy hood local exhaust ventilation device according to the present invention, the vortex fan is installed adjacent to the lower surface of the horizontal part of the canopy hood and the horizontal part is extended to be more than 1 times the inner diameter of the vortex fan, compared to the conventional canopy hood local exhaust ventilation device. The material collection efficiency is significantly improved.

1 is an illustration showing the result of simulating the flow velocity distribution of a conventional canopy hood (exhaust air volume 353㎥ / h).

2 is a schematic diagram of simulation when a vortex fan is installed in an exhaust duct without a canopy hood (exhaust air volume 353 m 3 / h).

3 and 4 are perspective views of a canopy hood local exhaust ventilation system according to an embodiment of the present invention.

Figure 5 is an exploded perspective view of Figure 4;

Figure 6 is a cross-sectional view of Figure 4;

7 is a diagram illustrating a simulation of a local exhaust ventilation device under a canopy hood according to an embodiment of the present invention (exhaust air volume 353 m 3 / h).

8 is a simulation diagram of a canopy hood local exhaust ventilation system according to another embodiment of the present invention (exhaust air volume 353㎥ / h).

9 is a simulation diagram of a canopy hood local exhaust ventilation system according to another embodiment of the present invention (exhaust air volume 353㎥ / h).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are only intended to be described in detail so that those skilled in the art can easily practice the invention, thereby limiting the scope of protection of the present invention. doesn't mean And in describing various embodiments of the present invention, the same reference numerals will be used for components having the same technical characteristics.

3 to 6 are views for explaining the configuration of a canopy hood local exhaust ventilation system according to an embodiment of the present invention, and the canopy hood local exhaust ventilation system will be described with reference thereto.

The canopy hood local exhaust system 100 includes an exhaust duct 200, a canopy hood 300 installed at the bottom of the exhaust duct 200, a vortex fan 400 installed inside the canopy hood 300, , and a drive motor 500 that drives the vortex fan 400.

The canopy hood 300 is coupled to the lower end of the exhaust duct 200, and specifically, the horizontal portion 310 of the canopy hood 300 is coupled to the lower end of the exhaust duct 200 by welding or bolting. As shown in the figure, the horizontal portion 310 of the canopy hood 300 may have a rectangular shape, but may have other shapes such as a circular shape. A through hole 301 is formed at the top of the canopy hood 300, that is, at the center of the horizontal portion 310, to communicate with the exhaust duct 200.

In this combination structure, the shape of the canopy hood 300 serves to guide the airflow pushed by the vortex fan 400, and the airflow pushed by the vortex fan 400 returns according to the shape of the canopy hood 300. Since the point at which the vortex is formed is different, the shape of the canopy hood 300 has a great effect on pollutant collection performance. The present inventors have noticed that there may be a difference in collection performance depending on the shape of the canopy hood 300, and this has been supported through various experiments (eg, FIGS. 1 and 7 to 9).

As shown in FIG. 1 , the conventional canopy hood 10 has an upper surface extending downwardly from the circumference of the exhaust duct 200 . This is a structure for minimizing the decrease in intake flow rate by minimizing the air flow volume as much as possible and maximizing the pollutant collection cross section by maximizing the hood inlet cross section. However, as confirmed in FIG. 1, the collection performance was remarkably low so that only a part of the canopy hood was sucked between the positions about 140 mm downward from the lower end of the canopy hood. This is because it relied only on the suction force of the fan built in the exhaust duct 200 .

Unlike this, the canopy hood 300 according to an embodiment of the present invention communicates with the horizontal portion 310 coupled to the lower end of the exhaust duct 200 and the exhaust duct 200 at the center of the horizontal portion 310. It has a through hole 301 formed to do so, and the distance from the circumference of the through hole 301 of the canopy hood 300 to the circumference of the horizontal portion 310 is 1 to 10 times the inner diameter of the vortex fan 400. The horizontal portion 310 is formed to extend.

In addition to this, the canopy hood 300 may have an inclined portion 320 extending obliquely downward at a predetermined angle from the circumference of the horizontal portion 310 . Furthermore, the canopy hood 300 may have a vertical portion 330 extending in a direction perpendicular to the horizontal portion 310 from the lower end of the inclined portion 320 .

The horizontal portion 310 of the canopy hood 300 serves to guide the air flow pushed outward of the through hole 301 by the vortex fan 400, and eventually the air flow passes through the rim of the canopy hood 300. It is guided to the inclined portion 320 to be configured. That is, by forming the horizontal portion 310 of the canopy hood 300 to be one or more times the inner diameter of the vortex fan 400, a space is provided in which the airflow pushed by the vortex fan 400 can move in the horizontal direction.

At this time, in the course of the airflow passing through the horizontal portion 310 and along the inclined portion 320, the flow velocity in the inclined portion 320 is increased and the area for forming the rising airflow under the through hole 301 is expanded, thereby forming a canopy hood. The contaminant collection area of 300 is expanded. As described above, the length of the horizontal portion 310 is preferably 1 to 10 times the inner diameter of the vortex fan 400 . If the length of the horizontal portion 310 is less than one time the inner diameter of the vortex pan 400, the effect of expanding the collecting area according to the formation of the horizontal portion 310 is insignificant, and the length of the horizontal portion 310 is less than that of the vortex pan 400. If it exceeds 10 times the inner diameter, there is a disadvantage in that the effect of forming vortexes by the vortex fan 400 is lowered.

The vortex fan 400 is installed inside the canopy hood 300 and is rotatably disposed below the through hole 301 . As an example, the vortex fan 400 includes an annular rotating plate 410 having a through portion formed in the center, a plurality of fins 420 vertically formed on the rotating plate 410, and formed at the center of the through portion and driven. It may include a coupling portion 440 to which the drive shaft of the motor 500 is coupled, and a plurality of connection rods 450 radially extending from the coupling portion 440 to the inner circumferential surface of the rotating plate 410 . In addition, the vortex fan 400 may further include a circular belt member 430 vertically formed along the inner circumferential surface of the rotating plate 410, and at this time, the connecting rod 450 is connected to the circular belt member from the coupling part 440 It may be formed extending radially up to (430).

The vortex pen 400 may be installed adjacent to the lower surface of the horizontal part 310 of the canopy hood 300, and thus the airflow pushed outward by the vortex pen 400 is directed to the lower surface of the horizontal part 310. It moves in the horizontal direction along and comes into contact with the upper end of the inclined portion 320.

A driving motor 500 is installed inside the exhaust duct 200 to drive the vortex fan 400 . The driving motor 500 is installed above the through hole 301 of the canopy hood 300 by a motor bracket 600 having one side coupled to the canopy hood 300 and supporting the driving motor 500 .

The motor bracket 600 serves to support the drive motor 500 and at the same time absorbs and attenuates some vibration and noise generated when the drive motor 500 operates. The motor bracket 600 has a body portion 610 coupled to one surface of the drive motor 500, and one end is formed bent along the circumference of the body portion 610, and is formed outside the edge of the through hole 301 of the canopy hood 300. It may be made including four bending bars 620 to which the other end is coupled.

At this time, a hollow 611 is formed in the center of the body portion 610 so that the driving shaft of the driving motor 500 passes therethrough. In addition, the bending bar 620 includes an extension part 621 extending horizontally from the body part 610, a bent part 622 bent vertically downward at the end of the extension part 621, and a bent part ( 622) is bent outward perpendicularly with respect to the bent portion 622 at the end thereof and includes a support portion 623 coupled to the edge of the through hole 301 of the canopy hood 300 by welding or bolting. can

Compared to the conventional local exhaust system (e.g., FIG. 1), the canopy hood local exhaust system according to an embodiment of the present invention forms the upper surface of the canopy hood 300 as a horizontal portion 310 and is adjacent to the lower surface. The biggest technical feature is that the vortex fan 400 is installed so that it is disposed, and by this configuration, the airflow pushed outward by the vortex fan 400 moves along the horizontal part 310 of the canopy hood 300 and then , Since a vortex area is created on the lower side of the canopy hood 300 while moving along the inclined portion 320, the effect of expanding the collection area is obtained.

On the other hand, FIG. 2 is a case where only the vortex fan 400 is installed under the exhaust duct 200 without the canopy hood 300, and the upward airflow occurs only in an area about 30° left and right based on the direct downward direction of the vortex fan 400. (within the range of about 60° as a whole), it was confirmed that the airflow spreads in all directions in the area outside the angular range, which rather spreads the pollutants into the surrounding space.

The collection area of the canopy hood local exhaust ventilation system according to the embodiment of the present invention can be confirmed through FIGS. 7 to 9 . 7 to 9 are simulation diagrams of local exhaust ventilation devices under a canopy hood according to various embodiments under the same exhaust air volume (353 m3/h) condition.

As mentioned in the background art, the flow velocity in the area marked E in FIGS. 7 to 9 is the slowest (periphery of 0.100 [m/s] in the lower left spectrum) and D (2.900 [m/s] in the lower left spectrum). part around), C (part around 4.580 [m/s] in the lower left spectrum), B (part around 6.260 [m/s] in the lower left spectrum), A (part around 8.500 [m/s] in the lower left spectrum) ), the flow rate gradually increases toward the region indicated by Specifically, the area marked A indicates an area where the flow velocity is approximately 7 m/s to 8.5 ms/s, the area marked B indicates an area where the flow velocity is approximately 5.7 m/s to 6.9 ms/s, and the area marked C indicates a region where the flow velocity is approximately 2.9 m/s to 5.6 ms/s. In addition, the area marked with D indicates an area in which the flow velocity is approximately 1.8 m/s to 2.8 ms/s, and the area marked with E indicates an area in which the flow velocity is approximately 0.1 m/s to 1.7 ms/s. After the flow rate gradually increases from the lower part of the

canopy hoods

300, 300a, and 300b toward the vortex fan 400, it can be seen that the flow rate gradually decreases as the distance passes through the vortex fan 400.

7 shows that the canopy hood 300 includes a horizontal portion 310, an inclined portion 320, and a vertical portion 330. In this case, the distance from the circumference of the through hole 301 of the canopy hood 300 to the circumference of the horizontal portion 310 may be one or more times the inner diameter of the vortex fan 400, and is approximately the same as the inner diameter of the vortex fan 400. It is most preferable to form Compared to FIG. 1, under the same conditions (exhaust air volume 353㎥/h), the conventional canopy hood 10 forms a pollutant collection area with a flow rate of 0.1m/s from the lower end of the hood to a distance of 140mm downward, and only a part of it is sucked. However, unlike the canopy hood local exhaust system 100 shown in FIG. 7, a contaminant collection area with a flow rate of 0.1 m/s is formed from the bottom of the canopy hood 300 to a distance of 415 mm downward, so that the conventional canopy hood 10 ), it can be seen that the contaminant collection area is significantly expanded in the left and right directions and in the lower direction.

8 shows that the canopy hood 300a includes a horizontal portion 310, an inclined portion 320, and a flange portion 340. The canopy hood 300a may have a flange portion 340 extending outward from the lower end of the inclined portion 320 in a direction parallel to the horizontal portion 310, and the flange portion 340 extends in parallel. The collection area is expanded due to the hood structure. In this case, the distance from the circumference of the through hole 301 of the canopy hood 300 to the circumference of the horizontal portion 310 may be one or more times the inner diameter of the vortex fan 400, and is approximately the same as the inner diameter of the vortex fan 400. It is most preferable to form In the canopy hood local exhaust system 100a, a pollutant collection area with a flow rate of 0.1 m/s is formed from the lower end of the canopy hood 300a to a distance of 456 mm downward, and the collection area is larger than that of the canopy hood local exhaust system 100 of FIG. It can be seen that this is formed more widely.

9 shows that the canopy hood 300b includes a horizontal portion 310 and a vertical portion 330, but does not include an inclined portion 320. The canopy hood local exhaust device 300b includes a horizontal portion 310 extending in a horizontal direction around the through hole 301 and a vertical portion extending in a vertical direction downward from the circumference of the horizontal portion 310. (330). In this case, it is most preferable that the distance from the circumference of the through hole 301 of the canopy hood 300 to the circumference of the horizontal portion 310 is between 4 and 5 times the inner diameter of the vortex fan 400. In the canopy hood local exhaust system 100b of FIG. 9 , it can be confirmed that a contaminant collection area with a flow rate of 0.1 m/s is formed from the lower end of the canopy hood 300b to a distance of 390 mm downward. It is a lower value than the canopy hood local exhaust ventilation devices of FIGS. 7 and 8, but shows a much better collection efficiency than the conventional canopy hood of FIG. 1. In addition, there is an advantage in that the air flow pushed by the vortex fan 400 is prevented from going out of the hood, thereby preventing re-diffusion of contaminants.

Although the embodiments of the present invention have been described above, those skilled in the art will be able to carry out various modifications without departing from the scope of the claims of the present invention.

According to the canopy hood local exhaust ventilation system according to the present invention, the collection area of contaminants is expanded and the collection efficiency is remarkably improved.

Claims

a canopy hood having a horizontal portion coupled to a lower end of the exhaust duct and a through hole formed at the center of the horizontal portion to communicate with the exhaust duct;

a vortex fan installed below the through hole of the canopy hood to be adjacent to the lower surface of the horizontal portion; and

A drive motor installed inside the exhaust duct and coupled to the vortex fan to rotate the vortex fan,

The canopy hood local exhaust ventilation device, characterized in that the horizontal portion is formed to extend so that the distance from the circumference of the through hole of the canopy hood to the circumference of the horizontal portion is 1 to 10 times the inner diameter of the vortex fan.
The method of claim 1,

The canopy hood canopy hood local exhaust ventilation device, characterized in that further comprising an inclined portion extending obliquely downward at a predetermined angle from the circumference of the horizontal portion.
The method of claim 2,

The canopy hood may further include a vertical portion extending from a lower end of the inclined portion in a direction perpendicular to the horizontal portion.
The method of claim 2,

The canopy hood may further include a flange portion extending outward from a lower end of the inclined portion in a direction parallel to the horizontal portion.
The method of claim 2,

A canopy hood local exhaust ventilation device, characterized in that a distance from the circumference of the through hole to the circumference of the horizontal portion is approximately the same as the inner diameter of the vortex fan.
The method of claim 1,

The canopy hood further includes a vertical portion extending from the circumference of the horizontal portion downward in a vertical direction, and a distance from the circumference of the through hole to the circumference of the horizontal portion is between 4 and 5 times the inner diameter of the vortex fan. Canopy hood local exhaust system with
The method of claim 1,

It further includes a motor bracket coupled to the canopy hood to support the drive motor, wherein the motor bracket includes a body portion coupled to one surface of the drive motor, and is bent along a circumference of the body portion and has an end portion of the through hole. A canopy hood local exhaust system comprising four bent bars coupled to the outside of the rim.
The method of claim 7,

The bending bar is formed with an extension part extending in a horizontal direction from the body part, a bent part bent vertically downward at an end of the extension part, and bent vertically outward from an end of the bent part with respect to the bent part, and the A canopy hood local exhaust system comprising a support coupled to an edge of the through hole of the canopy hood.