CN110779058A

CN110779058A - Commercial exhaust hood with smoke guide plate and air suction strip seam

Info

Publication number: CN110779058A
Application number: CN201910692987.0A
Authority: CN
Inventors: 尤学一; 陈若凝
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-02-11

Abstract

The invention discloses a commercial smoke exhaust hood with smoke guide plates and air suction slots, which comprises a smoke exhaust hood (4); the smoke exhaust device also comprises an air suction strip seam (1) positioned at the front end of the smoke exhaust hood (4) and two smoke guide plates (2) which are positioned at the hood opening of the smoke exhaust hood (4), have the same size and are in a horizontal state, and the periphery of each smoke guide plate (2) keeps a distance with the edge of the smoke exhaust hood (4); wherein: the air suction strip seam (1) is used for carrying out secondary collection on oil smoke escaping from the front end of the smoke exhaust hood (4); the fume flow orderly rises through the fume guide plate (2) and intensively enters the range hood. Compared with the prior art, the invention not only ensures higher oil fume collecting efficiency, but also solves the problem of uneven body cooling and heating of a chef caused by the downward air curtain.

Description

Commercial exhaust hood with smoke guide plate and air suction strip seam

Technical Field

The invention relates to the field of kitchen equipment, in particular to a novel commercial kitchen smoke exhaust hood.

Background

In recent years, the indoor air quality of a commercial kitchen draws wide attention, and compared with a household kitchen, the commercial kitchen has larger indoor heat load, oil smoke and water vapor amount due to the characteristics of long working time, large sewage discharge amount and the like, is an indoor environment integrating high energy consumption and severe environment quality, and has great influence on the health, comfort and productivity of workers in the kitchen. The current research about commercial enclosure structure is less, and commercial kitchen oil smoke pollution source intensity is big, and is long, more needs to optimize the structure of enclosure, raises the efficiency, guarantees kitchen air quality and operator's physical and mental health.

In order to improve the trapping efficiency of the range hood, the domestic range hood on the market is diversified in structural form at present, and a novel domestic range hood structure which utilizes the wall attachment effect and the venturi effect and is provided with a smoke guide plate at the air inlet of the range hood so that the oil smoke can flow uniformly without streaming is disclosed in 'a range hood with a smoke guide plate' in Chinese patent 200910096759.3. A new household range hood structure that utilizes the top of the range to form an effective air curtain to greatly improve the oil smoke absorption effect is also disclosed in chinese patent 201710288463.6, a kitchen air curtain system. Although the jet air curtain has a certain effect of preventing oil smoke above the cooking range from overflowing, a cook can alternately come in and go out under the environment of the air curtain, so that uneven cooling and heating of the whole body area of the body can be easily caused, the cook can catch a cold, and the food safety and sanitation problems are further influenced to a certain extent. On the other hand, the size of the commercial range hood is much larger than that of the household range hood, under the condition that only one exhaust fan works, when the rising oil smoke gas flow is guided by the smoke guide plate to be sent to the front end of the hood opening of the exhaust hood to be collected, the flow speed of the oil smoke reaching the front end of the hood opening is already attenuated, pollutants are easy to overflow at the front end of the hood opening, particularly for the commercial exhaust hood with larger oil smoke quantity, the suction action range of the common commercial exhaust hood is very limited, the speed is quickly attenuated when the common commercial exhaust hood leaves the exhaust opening, and the worst point of the exhaust hood on the collection of the oil smoke pollutants is positioned at the front end of the hood opening. The invention provides a method for solving the problems of comfort of a cook and oil smoke guiding process of a smoke guide plate.

Disclosure of Invention

In order to overcome the structural defects of the existing smoke exhaust hood of the range hood, the invention provides the commercial smoke exhaust hood with the smoke guide plate and the air suction strip seam.

The invention relates to a commercial smoke exhaust hood with smoke guide plates and air suction slots, which comprises a smoke exhaust hood 4; the smoke exhaust device also comprises an air suction strip seam 1 positioned at the front end of the smoke exhaust hood 4 and two smoke guide plates 2 which are positioned at the hood opening of the smoke exhaust hood 4, have the same size and are in a horizontal state, and the periphery of each smoke guide plate 2 keeps a distance with the edge of the smoke exhaust hood 4; wherein:

the air suction strip seam 1 is used for carrying out secondary collection on oil smoke escaping from the front end of the smoke exhaust hood 4;

the oil smoke gas flow rises orderly through the smoke guide plate 2 and enters the range hood concentratedly.

Compared with the prior art, the invention not only ensures higher oil fume collecting efficiency, but also solves the problem of uneven body cooling and heating of a chef caused by the downward air curtain.

Drawings

FIG. 1 is a schematic view of a commercial extractor hood with smoke guide plates and air suction slots according to the present invention;

FIG. 2 is a schematic view of a CFD model according to an embodiment of the present invention;

FIG. 3 is a graph showing the relationship between the primary collection efficiency and the exhaust amount (with the slot suction amount of 89.2 m) of the original canteen hood and the suction type hood with the smoke guide plate in the first working area ³For example,/h);

FIG. 4 is a graph showing the relationship between the primary collection efficiency and the exhaust amount (with the slot suction amount of 89.2 m) of the original canteen hood and the suction type hood with the smoke guide plate in the second working area ³For example,/h).

Reference numerals:

1. air suction strip seam 2, smoke guide plate 3, range hood body 4, smoke exhaust hood 5, working area one, working area 6 and working area two.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings and examples. .

Fig. 1 is a schematic structural view of an induced draft type commercial range hood smoke exhaust hood with a smoke guide plate, which comprises an induced draft strip seam 1, a smoke guide plate 2 and a range hood body 3. The air suction strip seam 1 is arranged at the front end of the smoke exhaust hood 4 and plays a role in air exhaust; the smoke guide plates 2 are two, are same in size (the length is 0.84m, the width is 0.7m) and are horizontal, are arranged at the cover opening of the smoke exhaust cover, a certain distance is kept between the periphery of the smoke guide plates 2 and the edge of the smoke exhaust cover 4, oil smoke flows orderly ascend under the action of the smoke guide plates 2 and intensively enter the range hood through the wall attachment effect of the smoke guide plates 2, but when the oil smoke flows are guided to the front side of the smoke exhaust cover 4 under the action of the smoke guide plates 2, the speed of the oil smoke flows is attenuated, the risk of oil smoke overflow exists, a defense line is additionally arranged at the front end of the smoke exhaust cover 4 by utilizing the air suction strip seams 1, secondary collection is carried out on the oil smoke which possibly escapes from the front end of the smoke exhaust cover, and the commercial smoke exhaust cover with improved structure can be understood as a large air exhaust opening and a small air exhaust opening for collecting oil smoke pollutants, and the air suction range of the range hood is.

The invention creatively arranges the air suction strip seam at the front end of the smoke hood, combines the high-efficiency oil smoke collection technology of the smoke guide plate, couples the two collection technologies, and applies the smoke guide plate technology widely used in the field of household range hoods to the structure of commercial range hoods. The invention is applied to a canteen kitchen model shown in figure 2, and the efficient oil smoke collecting effect of the air suction type commercial smoke exhaust hood with the smoke guide plate is verified. The specific simulation verification process is as follows:

firstly, simulating the primary collection efficiency of oil smoke particles of the original canteen smoke hood under the working conditions of various exhaust volumes, and respectively calculating the primary collection efficiency of a first working area 5 and a second working area 6. The range of the exhaust air volume is determined according to the regulation of national environmental protection GB18483-2001 catering industry oil smoke emission standard. The average exhaust air volume of the range hood in each working area is set to 3000-5000m during design calculation ³H, are each 3000m ³/h、3500m ³/h、4000m ³/h、4500m ³/h、5000m ³H is used as the reference value. A calculation formula of primary trapping efficiency is disclosed in chinese patent 201711254268.8 "a method for determining the oil smoke trapping efficiency of a range hood based on CFD". Then, after the original canteen smoke hood is changed into the induced draft type smoke hood model with the smoke guide plate, other boundary conditions and the like are kept unchanged, and the primary collection efficiency of the oil smoke particles in the environment of the induced draft type smoke hood with the smoke guide plate is calculated. Finally, the primary collection efficiency of the original canteen smoke hood and the induced draft type smoke hood with the smoke guide plate is compared, and the result shows that the primary collection efficiency of the induced draft type smoke hood with the smoke guide plate is stably higher than that of the original canteen smoke hood in the full air volume range no matter in the working area I or the working area II, and the oil smoke absorption effect is achievedAnd the lifting is greatly improved.

Claims

1. A commercial smoke exhaust hood with smoke guide plates and air suction strip seams comprises a smoke exhaust hood (4); the device is characterized by further comprising an air suction strip seam (1) positioned at the front end of the smoke exhaust hood (4) and two smoke guide plates (2) which are positioned at the hood opening of the smoke exhaust hood (4), have the same size and are in a horizontal state, and the periphery of each smoke guide plate (2) keeps a distance with the edge of the smoke exhaust hood (4); wherein:

the air suction strip seam (1) is used for carrying out secondary collection on oil smoke escaping from the front end of the smoke exhaust hood (4);

the fume flow orderly rises through the fume guide plate (2) and intensively enters the range hood.