WO2007056896A1 - Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe - Google Patents

Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe Download PDF

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Publication number
WO2007056896A1
WO2007056896A1 PCT/CN2005/001971 CN2005001971W WO2007056896A1 WO 2007056896 A1 WO2007056896 A1 WO 2007056896A1 CN 2005001971 W CN2005001971 W CN 2005001971W WO 2007056896 A1 WO2007056896 A1 WO 2007056896A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
air curtain
receiving hood
hood
curtain
Prior art date
Application number
PCT/CN2005/001971
Other languages
English (en)
Chinese (zh)
Inventor
Shueiyuan Lee
Peihsin Pei
Shunchih Wang
Chengping Chang
Tungsheng Shih
Original Assignee
Acxing Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Acxing Industrial Co., Ltd. filed Critical Acxing Industrial Co., Ltd.
Priority to PCT/CN2005/001971 priority Critical patent/WO2007056896A1/fr
Priority to CNB2006100829829A priority patent/CN100473914C/zh
Publication of WO2007056896A1 publication Critical patent/WO2007056896A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A61G13/108—Means providing sterile air at a surgical operation table or area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2028—Removing cooking fumes using an air curtain

Definitions

  • the present invention relates to a hood exhaust method and apparatus therefor, and more particularly to an air curtain assisted exhaust method and apparatus therefor. Background technique
  • the prior art local exhaust device is usually equipped with an air hood above it, but the collection efficiency of the air hood is reduced by the lateral diffusion of the pollution source and the environmental crosswind.
  • the former provides an exhaust cabinet with a back wall, a side wall and a front sliding door, which can reduce the influence of the ambient crosswind, but the exhaust cabinet side wall and the front sliding door
  • the structure makes the size of the table and the upper living space of the operator limited, and the design of the front sliding door is not convenient. Therefore, it is an important issue to improve the disadvantages of the lateral diffusion of the pollution source and the influence of the ambient crosswind when using the receiving hood, while retaining the elasticity of the table size and the operation form.
  • an air curtain generator is disclosed in U.S. Patent No. 6,450,879, issued Sep. 17, 2002.
  • the air curtain generator is disposed between the table and the operator to provide an upward air curtain, but the upward air curtain only isolates the pollution source.
  • the operator spreads on the side of the direction and does not insulate the source of contamination from diffusing to the side where the curtain generator is not provided.
  • the inventor of the present invention discloses an air curtain generator in the case of U.S. Patent No. 6,752,144, published on Jun. 22, 2004, and the present invention is an extension of the present invention.
  • Invention disclosure is disclosed in U.S. Patent No. 6,752,144, published on Jun. 22, 2004, and the present invention is an extension of the present invention.
  • a primary object of the present invention is to provide a curtain assisted exhaust method and apparatus therefor to solve the problems of the prior art.
  • an air curtain assisted exhaust method disclosed by the present invention is configured to take out air by using a receiving hood disposed above a workbench, and is disposed on the outer edge of the workbench and is located at the receiving end.
  • the trapping efficiency of the plurality of air curtains blown by the air curtain generator in the range vertically below the air hood to assist the suction airflow of the receiving hood, the method of the present invention is to first set the area of each air curtain generator to surround the table, Let this area be smaller than the opening area of the receiving hood.
  • each of the air curtain generators is activated to blow out the air curtain having the air supply speed, which is composed of the air supply direction and the air supply rate, wherein the air supply rate is decremented away from the air curtain generator.
  • Each air curtain is blown to the opening of the receiving hood, wherein the effective working area of each air curtain is smaller than the opening area of the receiving hood, and the vertical component of the air supply direction is directed to the opening of the receiving hood.
  • activating the receiving hood to attract the airflow with the exhaust rate the exhaust rate is decreasing away from the receiving hood, and the exhaust rate at the opening of the receiving hood is greater than the air supply rate, wherein the airflow having the exhaust rate It is defined as a shielding space with each air curtain.
  • the device of the present invention is configured to be disposed on a workbench, and the structure includes a receiving hood and an air curtain generator.
  • the receiving hood is disposed above the workbench, and the air curtain generator is disposed at an outer edge of the workbench.
  • the air curtain blown by each air curtain generator is directed toward the opening of the receiving hood, so that the air curtain, the working table and the receiving hood are enclosed together to form a shielding space, wherein the air curtain is used to assist the collecting performance of the receiving hood.
  • the present invention can be applied to a workbench having a wall surface and a method and a device.
  • each of the air curtain generators is adjusted so that each air curtain generator surrounds each of the wall surfaces to surround the area of the table, so that the area is smaller than the opening area of the receiving air hood.
  • the air curtain can lift the pollution source to the receiving hood and discharge, thereby assisting the collection efficiency of the receiving hood, and at the same time being guided by the air curtain to the pollution source inside the shielding space can reduce the environmental crosswind pair Its impact.
  • the inward downward vortex intercepts and constrains the source of pollution and pushes it toward the table top, allowing the larger particles of the source to adhere to the tabletop, while the remaining particles follow the inward downward vortex Enter the air curtain and lift to the opening of the receiving hood.
  • the invention can guide the pollution source generated inside the worktable to the receiving hood and discharge and effectively prevent the pollution source from being laterally oriented. Diffusion.
  • Figure 1 is a flow chart of the method of the present invention
  • FIG. 2 is a block diagram of the device of the present invention.
  • Figure 3 is a cross-sectional view of the air curtain generator of the present invention.
  • 4A, 4B are diagrams showing a first embodiment of the present invention.
  • 5A and 5B are cross-sectional views of an air flow field according to a first embodiment of the present invention.
  • Figure 6 is a graph showing experimental data of the efficacy test of the present invention.
  • each air curtain generator is first disposed to surround the work area of the work area, so that the area is smaller than the opening area of the receiving air hood. Then, each air curtain generator is activated to blow out the air curtain 101 with the air supply speed, and the air supply speed is air curtain production. The blowing force of the burner is determined by the air supply direction and the air supply rate, wherein the air supply rate is decremented away from the air curtain generator. Each air curtain is blown to the receiving hood opening 102, wherein the effective working area of each air curtain is smaller than the opening area, and the vertical component of the air supply direction is directed to the receiving hood opening.
  • the receiving hood activating the receiving hood to attract the airflow 103 with the exhaust rate, which is determined by the attractive force of the receiving hood, and is decremented away from the receiving hood, and the hood located at the opening of the receiving hood
  • the exhaust rate is greater than the air curtain feed rate, wherein the air flow with the exhaust rate is defined as a shielding space with each air curtain.
  • a position at which the pushing force of the blown air curtain of the shielded space is balanced with the attraction force of the receiving hood forms a boundary height, which means that the pushing force of the blown air curtain is weakened to the point that the airflow cannot be lifted and the receiving air is not received.
  • the attraction of the cover is weakened to the point where it is unable to attract airflow. Therefore, the shear stress provided by the air curtain at the boundary height will form an inward downward vortex.
  • the boundary height formed by this equilibrium state has a vertical static lag effect, that is, the airflow does not have a tendency to rise or fall at the boundary height
  • the present invention can be applied to a work surface having a wall surface.
  • the method of setting each air curtain generator is adjusted so that each air curtain generator fits the wall surface to surround the surface area of the work surface, so that the area is smaller than the area.
  • the opening area of the receiving hood can be used.
  • the shearing force provided by the air curtain at the boundary height cooperates with the wall blocking to form an inward downward eddy current.
  • the device is configured to be disposed on an open workbench 12, and the device includes a receiving hood 11 for being disposed above the workbench 12.
  • a plurality of air curtain generators 13 are disposed on the outer edge of the table 12, and the air curtain 15 blown by each air curtain generator 13 faces the opening of the receiving air hood 11, and the air curtain 15 can form a gas wall (only one air curtain is marked in the figure)
  • the gas wall formed by the air curtain 15 of the generator 13 is represented by the air curtain 15 so that the air curtain, the table 12 and the receiving hood 11 blown by the air curtain generator 13 together surround a shielding space 10, thereby assisting the receiving type gas.
  • the apparatus of the present invention can be disposed in conjunction with a table 12 having a wall surface (not shown), wherein the air curtain generator 13 is disposed on the outer edge of the table 12 having no wall surface, and the air curtain generator 13 is blown out.
  • the air curtain, the wall surface, the work table 12 and the receiving hood 11 are enclosed together to form a shielding space, which can also assist the collection efficiency of the receiving hood 11.
  • the receiving hood 11 can be a range hood in a kitchen working environment or an air hood in a laboratory and a factory.
  • the air curtain generators 13 can be coupled to each other to form a multi-piece structure.
  • FIG. 3 is a cross-sectional view of the air curtain generator 13, which includes an upward air outlet 16, an air inlet 22, and a squirrel-cage fan 14.
  • the squirrel-cage fan 14 rotates, the external airflow is caused to enter the air curtain generator 13 from the air inlet 22, and then the air curtain 15 is formed by the upward air outlet 16.
  • the angle at which the air curtain 15 is blown out from the upper air outlet 16 is 5 to 10 degrees.
  • the air curtain generator 13 may also be replaced by a blower, that is, the squirrel-cage fan 14 may be replaced by a ventilation pipe that communicates with the air blower, and the blow airflow is blown into the air curtain generator 13 through the air duct by the air blower, and then the air curtain generator 13 is turned upwards.
  • the tuyere 16 sends out an air flow to form an air curtain 15.
  • FIG. 4A and FIG. 4B are the apparatus of the first embodiment.
  • the receiving hood 11 is disposed above the table 12, and the table 12 has a wall surface 17, and the air curtain generator 13 is disposed without The outer edge of the table 12 of the wall 17 (as shown in Figure 4A).
  • 4B is a plan view of the apparatus.
  • the ratio of the area of the air curtain generator 13 surrounding the table to the wall surface 17 and the opening area of the receiving hood 11 is 0.8 (this ratio is the air curtain generator 13 and the receiving type).
  • the device can provide a proportional value for the best effect).
  • the air curtain generator 13 When the air curtain generator 13 is activated and the air curtain 15 is blown toward the opening of the receiving hood 11, the air supply speed of the air curtain 15 is decreased as it goes away from the air curtain generator 13.
  • the effective working area When the air curtain 15 is blown to the opening of the receiving hood 11, the effective working area will be smaller than the opening area of the receiving hood 11.
  • each of the air curtains 15 presents a converging direction from the air curtain generator 13 to the receiving hood 11 such that the vertical component of the direction of the air supply speed of the air curtain 15 (not shown) is directed to the receiving.
  • the hood 11 is open, and the horizontal component (not shown) in this direction is directed to the inside of the shielded space 10.
  • the receiving hood 11 is activated to discharge the suction airflow into the receiving hood 11, and the attracted airflow has an exhaust rate determined by the attractive force of the receiving hood 11, when the distance receiving hood 11 is received. The farther the opening is, the smaller the attraction is, so that the attracted airflow has a lower exhaust rate.
  • the discharge rate at the opening of the receiving hood 11 is controlled to be higher than the air supply speed of the air curtain 15 blown to the opening of the receiving hood 11, so that the blowing action of the air curtain 15 does not conflict with the suction action of the receiving hood 11.
  • FIG. 5A there is shown a cross-sectional view of the air flow field formed when the air curtain generator 13 is disposed on opposite sides of the table 12.
  • the blowing action of the air curtain 15 and the suction action of the receiving hood 11 cause the ascending airflow 18, which can guide the pollution source into the receiving hood 11 when a pollution source (not shown) is generated inside the shielding space 10. discharge.
  • a vertical stagnation zone 20 is formed, and in the vertical stagnation zone 20
  • the flow exhibits a state of neither rising nor falling due to insufficient rising force, so that larger particles in the vertical stagnation zone 20 are settled by gravity, i.e., enter the inward downward vortex 21.
  • the inward downward vortex 21 first intercepts and restrains the pollution source and then pushes it to the surface of the table 12, so that the larger particles in the pollution source settle due to gravity and adhere to the surface of the table 12, and the remaining pollution sources are further pushed by the inward downward vortex 21
  • the air curtain 15 enters the ascending airflow 18, and thus is lifted up to the receiving hood 11 to be discharged. Therefore, the air flow field formed by the shielding space 10 effectively discharges the pollution source inside the worktable 12 from the receiving hood 11, or adheres the larger particles to the surface of the table 12 by gravity, thereby being effective.
  • the leakage source is prevented from leaking out, and the collection efficiency of the receiving hood 11 is improved.
  • FIG. 5B there is shown a cross-sectional view of the air flow field formed when the opposite sides of the table 12 are the air curtain generator 13 and the wall surface 17.
  • the blowing action of the air curtain 15 and the suction action of the receiving hood 11 cause an ascending air flow 18, which can guide the pollution source into the receiving when a pollution source (not shown) is generated inside the shielding space 10.
  • the hood 11 is discharged.
  • a vertical stagnation zone 20 is formed at a boundary height 19 closer to the wall surface 17. In the vertical stagnation zone 20, the airflow does not rise or fall due to insufficient lift force, and the pollution source in the zone is prone to generate particles.
  • the effect of the bond when the particles are large enough to settle by gravity, will enter the inward downward vortex 21 .
  • the inward downward vortex 21 first intercepts and restrains the pollution source and then pushes it to the surface of the table 12 closer to the wall surface 17, so that the bonding particles in the pollution source settle due to gravity and adhere to the surface of the table 12, and the remaining pollution sources are further
  • the inward downward vortex 21 is pushed toward the air curtain 15 to enter the ascending airflow 18, and is lifted up to the receiving hood 11 to be discharged.
  • the air flow field between the wall surface 17 and the air curtain 15 effectively guides the pollution source inside the worktable 12 from the receiving hood 11, or causes the larger particles to adhere to the surface of the table 12 by gravity, thus The leakage of the pollution source can be effectively prevented, and the collection efficiency of the receiving hood 11 can be improved.
  • the control group of this experiment detects the concentration of sulfur hexachloride contained in the gas sample discharged from the activated receiving hood 11 when the air curtain generator 13 is not activated, and the experimental group of this experiment simultaneously activates the air curtain generator 13 and When the hood 11 is received, the concentration of sulfur hexachloride contained in the gas sample discharged from the hood 11 is detected.
  • the control group and the experimental group gradually increased the vertical distance between the release device of sulfur hexachloride and the table 12 during the experiment, and recorded the gas separately under different vertical distance conditions.
  • the body detector detects the value of the concentration of sulfur hexachloride.
  • the receiving hood exhaust duct wind speed is 5.0 m / s
  • the receiving hood exhaust duct diameter is 200 mm
  • the receiving hood exhaust air volume is 9.42 m ⁇ 3 / min.
  • the sulfur hexachloride release flow rate was 59.5 ml/min.
  • the horizontal axis is the vertical distance (in centimeters, negative value indicates that the release device extends into the hood opening) of the receiver hood opening and the sulphur hexachloride release
  • the vertical axis is the gas detector for detecting hexachloro
  • the value of the concentration of sulfur is calculated to determine the collection efficiency of the receiving hood.
  • a is the experimental data of the experimental group
  • b is the experimental data of the control group.
  • the present invention has a shielding space defined by a gas flow having an exhaust rate and a curtain defined by each air curtain or a shield space defined by a wall surface, in the case where an air flow field as shown in FIG. 5A or FIG. 5B can be generated.
  • Both can effectively guide the internal pollution source of the workbench to the discharge of the receiving hood, and prevent the pollution source from diffusing laterally and leaking, which are all areas to be protected by the present invention. If the pollution source contains large particles so that it cannot be discharged by the receiving hood, it can be guided to the table top and adhered.
  • the operator finishes working first close the receiving hood and then close the air curtain generator. It can clean the source of contamination that adheres to the surface of the workbench.
  • the air curtain generator of the present invention can assist the collection efficiency of the receiving hood, and therefore, in the working environment where the receiving hood is insufficient in pumping force, it is possible to provide an energy saving effect without additionally adding an apparatus for lifting the suction force.
  • the environment in which the receiving hood is originally provided may also be provided with an air curtain generator to assist the efficiency of the exhaust using the method of the present invention.
  • the air curtain can lift the pollution source to the receiving hood and discharge, thereby assisting the collection efficiency of the receiving hood, and at the same time being guided by the air curtain to the pollution source inside the shielding space can reduce the environmental crosswind pair Its impact.
  • the inward downward vortex intercepts and restrains the source of pollution.
  • the bundle is then pushed toward the table top to allow the larger particles of the source to adhere to the table top, while the remaining particles are vortexed inwardly into the curtain and lifted up to the opening of the receiving hood.
  • the invention can guide the pollution source generated inside the worktable to the receiving type hood to discharge and effectively prevent the lateral diffusion of the pollution source.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Ventilation (AREA)
  • Devices For Use In Laboratory Experiments (AREA)

Abstract

La présente invention concerne un procédé d'évacuation d'air avec un rideau d'air auxiliaire et un appareil associé. Un générateur de rideau d'air est disposé sur le tableau de fonctionnement de manière à entourer une zone partielle dudit tableau. Un boîtier de logement est placé au-dessus dudit tableau de fonctionnement. L'extrémité inférieure montante du bord externe du boîtier peut recouvrir entièrement la zone susmentionnée. Ledit générateur de rideau d'air peut être activé de manière à souffler un rideau au niveau de l'ouverture du boîtier. Puis, le boîtier de logement peut être activé pour aspirer le flux d'air. Ledit flux d'air et le rideau d'air aspirés par ledit boîtier forment un espace de protection. Le rideau d'air permet d'acheminer la source de pollution engendrée dans l'espace de protection jusque dans le boîtier de logement et, puis, de l'évacuer. Ledit procédé de cette invention permet aussi d'assister l'évacuation de l'air pollué et de limiter la source de pollution à l'espace de protection, de manière à empêcher la source de pollution de se diffuser latéralement.
PCT/CN2005/001971 2005-11-21 2005-11-21 Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe WO2007056896A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2005/001971 WO2007056896A1 (fr) 2005-11-21 2005-11-21 Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe
CNB2006100829829A CN100473914C (zh) 2005-11-21 2006-06-23 气帘辅助排气方法及其装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/001971 WO2007056896A1 (fr) 2005-11-21 2005-11-21 Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe

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Publication Number Publication Date
WO2007056896A1 true WO2007056896A1 (fr) 2007-05-24

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PCT/CN2005/001971 WO2007056896A1 (fr) 2005-11-21 2005-11-21 Procede d'evacuation d'air avec un rideau d'air auxiliaire et appareil associe

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06347047A (ja) * 1993-06-08 1994-12-20 Yamaoka Kinzoku Kogyo Kk 煙の浄化システム
US6851421B2 (en) * 2000-01-10 2005-02-08 Halton Company Exhaust hood with air curtain

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06347047A (ja) * 1993-06-08 1994-12-20 Yamaoka Kinzoku Kogyo Kk 煙の浄化システム
US6851421B2 (en) * 2000-01-10 2005-02-08 Halton Company Exhaust hood with air curtain

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