A fume exhaust pipe

Abstract

The present invention discloses an oil fume exhaust pipe, comprising a pipe body and a plurality of guide blades; the bottom end of the guide blades is fixedly connected to the inner wall of the pipe body, the guide blades are evenly distributed in a plurality of layers along the axial direction of the pipe body, and the guide direction is counterclockwise along the radial direction of the pipe body; the height of the guide blades gradually decreases along the oil fume exhaust direction; the symmetric center line of the cross section of the guide blades is a sine curve. The oil fume exhaust pipe with a plurality of guide blades on the inner wall of the present invention can generate a cyclone with a certain centrifugal force when the oil fume passes through, thereby separating large particles of oil fume in the smoke, and then cooperating with other types of oil fume purification equipment in the system to achieve more efficient oil fume purification efficiency; 2. The structure of the present invention is simple, and the cost of manufacturing, using and maintaining is low.

Description

Technical Field

[0001] The invention relates to the technical field of oil fume removal devices, and in particular to an oil fume exhaust pipe. Background Art

[0002] Oil smoke is a large amount of thermal oxidation decomposition products produced by cooking oil and food under high temperature conditions. In the kitchens of hotels or restaurants, the oil smoke produced by cooking will first be collected by smoke collection equipment and then discharged through the oil smoke exhaust pipe, so that the oil smoke is controlled within a certain range and does not spread to this space.

[0003] Although there are many types of existing oil fume treatment devices, most of them are straight exhaust fans or oil fume extraction equipment. The purification effect of a single device on oil fume is very limited, and it does not fundamentally solve the problem of oil fume polluting the air environment. Moreover, as an important component of the oil fume exhaust equipment, the oil fume exhaust pipe is mostly a straight tube structure, which only serves as a channel. The efficiency of oil fume passing through the pipe depends only on the power of the exhaust equipment (such as exhaust fans and hoods). Even when the pipe design is unreasonable, it will cause the accumulation and poor discharge of oil fume. The existing technology uses oil fume purification technology to solve the above problems, but the common oil fume purification technology has the problems of high equipment cost, short effective action time of separation equipment, complex equipment structure, high operation and maintenance requirements, high operating costs, secondary pollution and large floor space. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an oil fume exhaust duct with a guide blade structure. The shape of the guide blade is used to make the oil fume exhaust duct have a cyclone with a certain centrifugal force, which can separate large particles of oil fume in the flue gas. In combination with other types of oil fume purification equipment in the system, the oil fume purification rate of the whole system can be greatly improved.

[0005] In order to achieve the above-mentioned invention object, the technical solution provided by the present invention includes:

[0006] A fume exhaust pipe comprises a pipe body and a plurality of guide vanes;

[0007] The bottom end of the guide blade is fixedly connected to the inner wall of the pipe body, and a plurality of guide blades are evenly distributed in a circle in a plurality of layers along the axial direction of the pipe body, and the guide direction is arranged counterclockwise along the radial direction of the pipe body; the height of the guide blade gradually decreases along the direction of oil fume discharge; the symmetric center line of the cross section of the guide blade is a sine curve.

[0008] In some preferred embodiments, the height of the highest point of the guide vane is 1 / 20-1 / 30 of the inner diameter of the pipe body.

[0009] In some preferred embodiments, the curve equation of the guide vane height change line is: {x=100*t; z=50*sin(t*90-90)+50}; wherein, t∈[0,1].

[0010] In some preferred embodiments, the curve equation of the symmetrical center line of the guide vane cross section is: {x=100*t; z=50*sin(t*90-90)+50}.

[0011] In some preferred embodiments, the interval between the multiple layers of guide blades is 400-600 mm.

[0012] In some preferred embodiments, the number of the guide blades in each layer is 8.

[0013] In some preferred embodiments, an oil collecting hole is provided on the pipe wall of the pipe body.

[0014] Beneficial Effects

[0015] 1. The oil fume exhaust duct of the present invention has a plurality of guide blades on the inner wall, which can generate a cyclone with a certain centrifugal force when the oil fume passes through, thereby separating the large particles of oil fume in the smoke, and then cooperating with other types of oil fume purification equipment in the system to achieve more efficient oil fume purification efficiency; 2. The structure of the present invention is simple, and the cost of manufacturing, using and maintaining is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the shaft side structure in a preferred embodiment of the present invention;

[0017] Figure 2 It is a front view structural schematic diagram of a preferred embodiment of the present invention;

[0018] Figure 3 It is a schematic cross-sectional structure diagram of the AA cross-sectional elevation in a preferred embodiment of the present invention;

[0019] In the figure: 1. Pipe body; 2. Guide vane; DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0021] like Figure 1 As shown, this embodiment provides an oil fume exhaust pipe, including a pipe body 1, and also includes a plurality of guide blades 2; the bottom end of the guide blade 2 is fixedly connected to the inner wall of the pipe body 1, and the plurality of guide blades 2 are evenly distributed in a plurality of layers along the axial direction of the pipe body 1, and the guide direction is counterclockwise arranged along the radial direction of the pipe body 1; the height of the guide blade 2 gradually decreases along the oil fume exhaust direction; the symmetric center line of the cross section of the guide blade 2 is a sine curve. The cross-sectional shape of the pipe body 1 is preferably circular. The number of distribution layers of the guide blades 2 in the axial direction of the pipe body 1 is determined by the length of the pipe body 1. In some preferred embodiments, in order to reduce the number of layers of the guide blades 2 while ensuring a better exhaust effect, the interval between the multiple layers of the guide blades 2 is 400-600mm, preferably 500mm; the number of the guide blades 2 in each layer is 8, and they are evenly distributed on the circumference, that is, the angle between the two adjacent guide blades 2 in the same layer and the axis of the pipe body 1 is 45°.

[0022] When in use, the fume exhaust pipe is connected to the exhaust port of the fume collection device. When the smoke flows through this section of the pipe, the air near the guide blade 2 on the outside rotates counterclockwise due to the guiding effect of the blade, gradually driving the air closer to the center to form a cyclone with a certain centrifugal force. The multi-layer guide blades 2 arranged at intervals can strengthen and maintain this cyclone. Therefore, the fume particles in the smoke have a greater density than the air, and under the action of centrifugal force, they gradually break away from the center of the pipe and are thrown to the periphery of the cyclone, so that they are captured by the inner wall of the pipe and condensed into liquid oil droplets. Finally, the separation of fume particles is achieved, and the system can achieve a higher fume purification rate by cooperating with other fume purification facilities (such as electrostatic fume purification equipment and mechanical static filter nets in the catering industry).

[0023] In some preferred embodiments, in order to reduce wind noise and wind resistance as much as possible, it is considered to set the height change of the blade linearly to a smooth curve. Specifically, the curve equation of the height change line of the guide blade 2 is: {x=100*t; z=50*sin(t*90-90)+50}; wherein t is (t∈[0,1]). In other preferred embodiments, in order to enhance the guiding effect and make the cyclone centrifugal force generated when the oil fume passes through stronger, the curve equation of the symmetrical center line of the cross section of the guide blade 2 is: {x=100*t; z=50*sin(t*90-90)+50}. It should be understood that the guiding directions of all guide blades 2 are the same, and the number and position of two adjacent layers of guide blades 2 are in a corresponding relationship. Preferably, the two adjacent layers of guide blades 2 are respectively on the same straight line parallel to the axial direction of the pipeline body 1. In order to achieve a better guiding effect, the height of the highest point of the guide blade is 1 / 20-1 / 30 of the inner diameter of the pipeline body.

[0024] In some other preferred embodiments, it is necessary to consider more convenient collection of liquid grease condensed on the inner wall surface of the pipe body 1. When the oil fume exhaust pipe is placed horizontally, an oil collecting hole can be set on the lower side of the pipe body 1, so that the liquid grease condensed on the inner wall surface of the pipe body 1 is automatically collected in the oil collecting hole under the action of gravity and flows out of the oil fume exhaust pipe, and then further processed by other purification equipment; when the oil fume pipe is placed vertically, a non-powered wind hood can be set at the tail end of the pipe body 1, and the rotation direction of the non-powered wind hood matches the guide direction of the guide blade 2, so as to further reduce the discharge wind resistance.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fume exhaust pipe, comprising a pipe body (1), Features: Also includes a plurality of guide vanes (2); The bottom end of the guide blade (2) is fixedly connected to the inner wall of the pipe body (1); a plurality of guide blades (2) are evenly distributed in a plurality of layers along the axial direction of the pipe body (1), and the guide direction is arranged counterclockwise along the radial direction of the pipe body (1); the height of the guide blade (2) gradually decreases along the direction of oil fume discharge; and the symmetric center line of the cross section of the guide blade (2) is a sine curve.

2. The oil fume exhaust duct according to claim 1, Features: The height of the highest point of the guide vane (2) is 1 / 20-1 / 30 of the inner diameter of the pipe body (1).

3. The oil fume exhaust duct according to claim 1 or 2, Features: The curve equation of the height variation line of the guide blade (2) is: {x=100*t; z=50*sin(t*90-90)+50}; wherein t∈[0,1].

4. The oil fume exhaust duct according to claim 1, Features: The curve equation of the symmetrical center line of the cross section of the guide blade (2) is: {x=100*t; z=50*sin(t*90-90)+50}; wherein t∈[0,1].

5. The oil fume exhaust duct according to claim 1, Features: The interval between the multiple layers of guide blades (2) is 400-600 mm.

6. The oil fume exhaust duct according to claim 1 or 5, Features: The number of the guide blades (2) in each layer is 8.

7. The oil fume exhaust duct according to claim 1, Features: An oil collecting hole is provided on the pipe wall of the pipe body (1).

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