CN108167907B - Range hood with non-constant rotating speed - Google Patents
Range hood with non-constant rotating speed Download PDFInfo
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- CN108167907B CN108167907B CN201810188655.4A CN201810188655A CN108167907B CN 108167907 B CN108167907 B CN 108167907B CN 201810188655 A CN201810188655 A CN 201810188655A CN 108167907 B CN108167907 B CN 108167907B
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- range hood
- oil smoke
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- concentric tube
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- 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
- F24C15/2021—Arrangement or mounting of control or safety systems
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separating Particles In Gases By Inertia (AREA)
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Abstract
A range hood with a non-constant rotating speed is provided with a range hood main body, an oil smoke separator, a variable speed motor and a variable speed fan, wherein the oil smoke separator is in transmission connection with the variable speed motor, the variable speed fan is assembled inside an air draft assembly of the range hood main body, and the oil smoke separator, the variable speed fan and a rotating motor are located inside the range hood main body. The range hood with the non-constant rotating speed can adjust the rotating speed inside the range hood repeatedly, and the oil absorption and oil removal effects are greatly improved. The oil smoke separator also generates additional centrifugal force to oil smoke gas, can effectively remove oil smoke particles, can avoid the contact of the gas containing a large amount of oil smoke particles and the wind wheel, greatly improves the separation effect of the oil smoke particles and reduces the noise generated by the accumulated oil stain of the wind wheel.
Description
Technical Field
The invention relates to the field of range hoods, in particular to a range hood with a non-constant rotating speed.
Background
WHO reports that 34% of 430 thousands of people WHO died globally due to kitchen air pollution in 2012 suffered from stroke, 22% and 26% of chronic obstructive pulmonary disease and ischemic heart disease, respectively, and about 6% died from lung cancer.
In the prior art, range hoods have three forms, top suction, side suction and bottom discharge. In any type of range hood, only the rotation of the wind wheel is used to separate the oil smoke, and the adjustment of the rotation speed of the wind wheel is limited, so that the separation effect is low, only a small part of oil smoke particles can be removed, and a large amount of oil smoke particles are remained in the discharged gas, thereby causing air pollution. And the wind wheel directly contacts with the oil smoke, and oil smoke particles can be adhered to the wind wheel after long-term use, so that the wind wheel works under load, and the working efficiency of the wind wheel is seriously influenced, thereby reducing the whole smoking effect.
Therefore, aiming at the defects in the prior art, the range hood with the non-constant rotating speed is provided to solve the defects in the prior art.
Disclosure of Invention
The invention aims to provide a range hood with a non-constant rotating speed, which avoids the defects of the prior art. The range hood with the non-constant rotating speed can adjust the rotating speed inside the range hood repeatedly, and greatly improves the oil absorption and deoiling effects.
The above object of the present invention is achieved by the following means.
The utility model provides a lampblack absorber of invariable rotational speed, is provided with cigarette machine main part, oil smoke separator, variable speed motor and variable speed fan, and oil smoke separator is connected with the variable speed motor transmission, and the variable speed fan assembles inside the convulsions subassembly of cigarette machine main part, and oil smoke separator, variable speed fan and rotating electrical machines are located inside the cigarette machine main part.
Preferably, the variable speed motor is provided with a first controller and a motor main body, and the first controller is electrically connected to the motor main body.
Preferably, the variable speed fan is provided with a second controller and a fan main body, and the second controller is electrically connected with the fan main body.
Preferably, the first controller is a transformer or a frequency converter.
Preferably, the second controller is a transformer or a frequency converter.
Preferably, the oil smoke separator is provided with a plurality of concentric tubes with coincident center axes, a rotating shaft and a plurality of eaves structures, the rotating shaft is fixedly connected with one end of each of the concentric tubes, the eaves structures are arranged in a surrounding manner and fixedly installed at the other end of the corresponding concentric tube, and the rotating shaft is in transmission connection with the variable speed motor;
preferably, the air draft assembly is further provided with a wind wheel and a volute, the variable speed fan is assembled inside the volute, the wind wheel is in transmission connection with the variable speed fan, the volute is fixedly installed inside the cigarette machine main body, an air inlet of the volute is communicated with an air outlet above the concentric pipe, and an air outlet of the volute is communicated with an air outlet of the cigarette machine main body.
The side, facing the ground when the oil fume separator is installed, of the oil fume separator is defined as the lower side, and concentric pipes from the middle shaft to the outside are sequentially defined as a 1 st concentric pipe, an i concentric pipe, an n-1 concentric pipe and an n concentric pipe, wherein i is more than or equal to 2 and less than or equal to n, and n is a positive integer.
Height of the 1 st concentric tube is H 1 The height of the ith concentric tube isH i Content n-1 The height of the n-th concentric tube is H n ，H 1 Has the maximum value of H n The value of (c) is minimal.
Preferably, the above oil smoke separator is further provided with a vortex generating device set, the vortex generating device set is fixedly installed on the outer surface of the concentric tube and surrounds the joint of the cornice structure and the concentric tube, and the vortex generating device set is installed on the upper surface of the cornice structure.
Each vortex generating device group consists of one or more vortex generating sub-devices in the same eaves structure.
Preferably, the vortex generating device groups are m, m is any positive integer greater than 0, and the m vortex generating device groups are respectively fixedly installed on the outer surfaces of the concentric pipes and surround the connecting part of the eaves structure and the concentric pipes.
Preferably, the concentric tube is formed by a line segment formed by a plurality of broken lines surrounding the middle shaft for one circle, and the intersection position of two adjacent line segments on the inner wall of the concentric tube is a vortex generation position.
Preferably, the diameter of one end of the concentric tubes is larger than the diameter of the other end.
Preferably, at least one eaves structure is fixedly connected to the other end of the concentric tubes.
Preferably, the concentric tubes are provided with turbulence means which are seamlessly connected around the ends of one end of the concentric tubes.
Preferably, the range hood main body is provided with a shell and an oil collecting device, the oil fume separator is rotatably installed inside the shell, the air exhausting assembly is fixedly assembled inside the shell, and the oil collecting device is assembled at the bottom of the shell.
Preferably, the casing is provided with a plurality of casing air inlets and annular sheets matched with the plurality of casing air inlets, the annular sheets are fixedly installed or integrally connected to the corresponding inner surface of the casing and positioned at the edges of the casing air inlets, and the annular sheets correspond to the casing air inlets one to one.
The invention relates to a non-constant-rotating-speed range hood which is provided with a range hood main body, an oil smoke separator, a variable speed motor and a variable speed fan, wherein the oil smoke separator is in transmission connection with the variable speed motor, the variable speed fan is assembled inside an air draft assembly of the range hood main body, and the oil smoke separator, the variable speed fan and a rotating motor are positioned inside the range hood main body. The range hood with the non-constant rotating speed can adjust the rotating speed inside the range hood repeatedly, and the oil absorption and oil removal effects are greatly improved. The oil smoke separator also generates additional centrifugal force to oil smoke gas, can effectively remove oil smoke particles, can avoid the contact of the gas containing a large amount of oil smoke particles and a wind wheel, greatly improves the separation effect of the oil smoke particles and reduces the noise generated by the accumulated oil stain of the wind wheel.
Drawings
The invention is further illustrated by means of the attached drawings, the content of which is not in any way limiting.
Fig. 1 is a schematic structural diagram of an embodiment 1 of a range hood with a non-constant rotating speed according to the present invention.
Fig. 2 is a schematic structural diagram of the oil smoke separator in fig. 1.
Fig. 3 is a highly schematic view of the concentric tubes of fig. 2.
Fig. 4 is a perspective view of the housing and oil catcher of the present invention.
Fig. 5 is a simulation diagram of the flow of soot body gas according to the present invention.
Fig. 6 is a sectional perspective view of the oil smoke separator.
In fig. 1 to 6, there are included:
the device comprises an oil fume separator 1, a concentric pipe 11, a flow disturbing device 111, a rotating shaft 12, an eaves structure 13, a through hole 131, an eddy generating device group 14 and an eddy generating position 15;
the shell 2, the shell air inlet 21 and the annular sheet 22;
the oil collecting device 3, the variable speed motor 4, the air draft assembly 5, the wind wheel 51, the variable speed fan 52 and the volute 53.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1.
A range hood with a non-constant rotating speed is provided with a range hood main body, an oil smoke separator 1, a variable speed motor 4 and a variable speed fan 52, wherein the oil smoke separator 1 is in transmission connection with the variable speed motor 4, the variable speed fan 52 is assembled inside an air draft assembly 5 of the range hood main body, and the oil smoke separator 1, the variable speed fan 52 and a rotating motor are positioned inside the range hood main body as shown in figures 1 to 6.
The variable speed motor 4 is provided with a first controller and a motor main body, the first controller being electrically connected with the motor main body.
The variable speed fan 52 is provided with a second controller and a fan main body, and the second controller is electrically connected to the fan main body.
The first controller of the present invention is preferably a frequency converter, and the first controller may be a transformer. The second controller is preferably a frequency converter, and may also be a transformer.
The air draft assembly 5 is further provided with a wind wheel 51 and a volute 53 shell, the variable speed fan 52 is assembled inside the volute 53 shell, the wind wheel 51 is in transmission connection with the variable speed fan 52, the volute 53 shell is fixedly installed inside the cigarette machine main body, an air inlet of the volute 53 shell is communicated with an air outlet above the concentric pipe 11, and an air outlet of the volute 53 shell is communicated with an air outlet of the cigarette machine main body.
The side, facing the ground when the oil fume separator 1 is installed, of the oil fume separator is defined as the lower side, and concentric tubes 11 outwards from a middle shaft are sequentially defined as a 1 st concentric tube, an i concentric tube, an n-1 concentric tube, an n concentric tube, wherein i is more than or equal to 2 and less than or equal to n, and n is a positive integer.
Height of No. 1 concentric tube is H 1 Said i Said n-1 concentric tubes have a height H n-1 The height of the n-th concentric tube is H n ，H 1 Has the maximum value of H n The value of (c) is minimal.
The oil smoke separator 1 is further provided with a vortex generating device group 14, the vortex generating device group 14 is fixedly installed on the outer surface of the concentric tube 11 and surrounds the joint of the eaves structure 13 and the concentric tube 11, and the vortex generating device group 14 is installed on the upper surface of the eaves structure 13. Each group 14 of vortex generating devices consists of one or more vortex generating sub-devices of the same eave structure 13.
The number of the vortex generating devices 14 is m, m is any positive integer larger than 0, and the m vortex generating devices 14 are respectively and fixedly installed on the outer surface of the concentric tubes 11 and surround the connection part of the eaves structure 13 and the concentric tubes 11. The vortex generating device group 14 of the present invention is used for generating vortex for the oil smoke gas, thereby improving the oil removing capability.
N =3 in the present embodiment, that is, 3 concentric tubes 11 in the present embodiment are provided. In the present embodiment, m =2, that is, the vortex generating device group 14 is provided with 2, one is provided in the 3 rd concentric tube, and the other is provided in the 2 nd concentric tube. The number of concentric tubes 11 of the present invention can be any positive integer, and the set of vortex generating devices 14 can be less than or equal to any positive integer number of concentric tubes 11.
The concentric tube 11 is formed by a line segment consisting of a plurality of broken lines surrounding the center shaft in a circle, and the intersection position of two adjacent line segments on the inner wall of the concentric tube 11 is a vortex generation position 15. The shape of the concentric tube 11 of the invention has the function of enabling the oil smoke gas to generate vortex on the inner wall of the concentric tube 11 and improving the efficiency of removing the oil smoke.
The diameter of one end of the concentric tubes 11 is larger than the diameter of the other end. One end of the concentric tube 11 is the end connected with the air draft assembly 5, namely, the air outlet of the concentric tube 11, the other end of the concentric tube 11 is the air inlet of the concentric tube 11, and it can be known from the venturi effect that the larger the area through which the fluid flows, the smaller the flow rate is, namely, the speed of one end of the gas concentric tube 11 is higher than the speed of the other end of the concentric tube 11. According to bernoulli's law, the higher the speed of the gas, the lower the pressure, so the pressure at the end of the concentric pipe 11 connected with the ventilation assembly 5 is high, and the pressure at the air inlet of the concentric pipe 11 is low, thereby increasing the pressure difference between the air inlet of the concentric pipe 11 and the external environment, promoting the oil smoke gas to enter, and improving the oil absorption effect.
The other end of the concentric tube 11 of the present invention may be fixedly connected with at least one eave structure 13, or the other end of the concentric tube 11 may be fixedly connected with only one eave structure 13. The other end of the 1 st concentric tube of this embodiment is connected with two eaves structure 13. Two eaves portion structure 13 effects of 1 st concentric union coupling have reduced the space volume between 1 st concentric pipe and the 2 nd concentric pipe to reduce the area of the air inlet of the 2 nd concentric pipe, improved gaseous admission speed, increase the pressure differential of 11 inside and exterior spaces of concentric pipe.
The concentric tubes 11 are provided with flow perturbation means 111, the flow perturbation means 111 being connected seamlessly around the end of one end of the concentric tubes 11. The turbulence device 111 functions to generate a vortex flow of the soot gas, thereby improving the oil removing capability.
The cigarette machine main part is provided with shell 2 and oil collecting device 3, and oil smoke separator 1 is rotatory to be installed in the inside of shell 2, convulsions subassembly 5 fixed mounting in the inside of shell 2, and oil collecting device 3 assembles the bottom in shell 2.
The housing 2 is provided with a plurality of housing air inlets 21 and a ring-shaped sheet 22 matching with the plurality of housing air inlets 21, the ring-shaped sheet 22 is integrally connected with the corresponding inner surface of the housing 2 and is located at the edge of the housing air inlets 21, the ring-shaped sheet 22 and the housing air inlets 21 are in one-to-one correspondence, the ring-shaped sheet 22 of the present invention can also be fixedly installed on the housing, and the specific implementation mode is determined by implementation conditions.
The ring-shaped piece 22 functions to generate a vortex when the soot gas enters the housing 2, and to prevent soot particles from being thrown out of the outer space from the housing inlet 21 of the housing 2 when the soot particles are thrown out of the soot separator 1.
The working principle of the range hood is as follows: the range hood is opened, the motor drives the oil smoke separator 1, the wind wheel 51 of the air draft assembly 5 rotates simultaneously, oil smoke particles are separated in seven layers in the range hood, and finally the oil smoke particles are discharged from an air outlet through almost clean gas. The seven-layer separation is specifically as follows:
first layer separation, inertial separation: lampblack enters the interior of the range hood through the shell air inlet 21 of the shell 2, and enters the annular sheet 22 after entering the shell air inlet 21, because of the pressure difference between the interior of the shell 2 and the external environment and the sudden change of the area of the shell air inlet 21, the air flow speed is accelerated, and the inertia momentum is relatively increased. And the oil smoke will form a very thin boundary layer around the annular sheet 22, and because the outer casing air inlet 21 of the outer casing 2 forms an included angle with the annular sheet 22, the oil smoke is forced to flow upwards and enter the oil smoke separator 1 after flowing downwards along the annular sheet 22, so that the heavier oil separates from the crude oil smoke flow field in the downward inertial motion and moves downwards to be collected in the oil collecting device 3 at the bottom of the outer casing 2, and the first inertial separation is realized.
Second layer separation, vortex separation: the oil smoke particles separated by the first layer further generate flow field separation in the downward and upward flowing direction of the annular sheet 22, and the oil smoke particles cause an unstable flow field under the flow field separation to further form a vortex. The flow field or vortex interacts with the adjacent flow field or vortex, forming a non-stop rotating flow field on the ring-shaped plate 22, and the rotating vortex reaches the maximum vortex amount. The remaining light oil smoke will not stop at the rotating vortex of the annular sheet 22 and accumulate, and when a certain weight is accumulated, the flow field will not support the weight of the oil drop, and will fall downwards or flow along the annular sheet 22 to the oil collecting device 3.
Third layer separation, centrifugal separation: the eaves structure 13 rotates following the concentric tube 11 creating a centrifugal force which interacts with the attraction of the air extraction assembly 5. After the second separation, the remaining lighter oil smoke contacts the outermost end of the eaves structure 13 before entering the concentric tube 11, the centrifugal force at the outermost end of the eaves structure 13 can separate or block the partial fluid or oil smoke particles from the concentric tube 11 and move outwards, and then the particles are thrown away at a higher tangential speed, and the thrown particles can fall on the annular sheet 22, and finally the oil smoke flows to the oil collecting device 3 along the annular sheet 22.
Fourth layer separation, inertial separation and centrifugal separation: after the third layer of separation, the remaining oil smoke with lighter weight is simultaneously subjected to centrifugal force and attractive force, but the relative attractive force is greater than the centrifugal force. Some of the oil smoke will flow to the adjacent eaves structure 13 through the through holes 131, and will be gathered with other oil smoke or oil smoke particles into larger oil smoke particles to flow downward due to the inertia effect, and the oil smoke particles will be thrown out at a higher tangential speed due to the centrifugal force effect and finally flow to the oil collecting device 3 along the ring-shaped pieces 22.
Fifth layer separation, cyclonic centrifugal force and secondary vortex generation of concentric tubes 11: the inner wall of the concentric tube 11 rotates to form a cyclone, fluid or particles in the tube move towards the wall of the tube in a low-pressure area under the action of centrifugal force, the tube wall forms a high tangential velocity, and part of oil smoke is blocked from flowing upwards. In addition, the residual oil smoke can form vortex in the vortex generating device, and rotate without stopping, so that the oil smoke is captured and is not allowed to escape from the pipeline. After the attraction force and the centrifugal force are removed, the oil smoke which continuously rotates from the secondary vortex and moves at the pipe wall in a high tangent mode flows downwards along the inner pipe wall due to gravity and is collected to the oil collecting device 3.
The sixth layer is separated, the spoiler 111 is separated: the flow disturbing device 111 at one end of the concentric tube 11 generates flow field separation on the remaining oil smoke, and the flow field separation can block part of the oil smoke from flowing upwards and capturing the oil smoke by the vortex which does not rotate automatically due to the instability of the flow field.
Seventh layer separation, centrifugal separation of wind wheel 51: after the first six layers of separation, a small amount of very light oil smoke particles are sucked into the wind wheel 51 of the air draft assembly 5 due to pressure difference, the rotating wind wheel 51 forms centrifugal force to throw the remaining small amount of oil smoke particles onto the inner wall of the fan, and finally nearly clean gas is discharged outside through the air outlet.
The range hood with the non-constant rotating speed can adjust the rotating speed inside the range hood repeatedly, and the oil absorption and oil removal effects are greatly improved. This oil smoke separator 1 still produces additional centrifugal force to the oil smoke gas, can effectively get rid of the oil smoke particle, can avoid containing a large amount of oil smoke particle gas and wind wheel 51 contact, improves the separation effect of oil smoke particle greatly and reduces because of the noise that wind wheel 51 accumulation oil stain produced.
Example 2.
A range hood with a non-constant rotating speed has the same other characteristics as embodiment 1, except that: n =4 for the present embodiment, i.e. 4 concentric tubes 11 for the present embodiment are provided. In the present embodiment, m =2, that is, the vortex generating device group 14 is provided with 2, one is provided in the 4 th concentric tube, and the other is provided in the 3 rd concentric tube. While the concentric tubes 11 of this embodiment correspond one-to-one to the eave structure 13.
Compared with embodiment 1, the range hood with the non-constant rotating speed has the advantages that one concentric tube 11 is increased, namely, the space volume of the oil smoke separator 1 inside the shell 2 is increased, so that the area of an air inlet of the concentric tube 11 is reduced, the gas inlet speed is increased, the pressure difference between the inside of the concentric tube 11 and the outside space is increased, and the separation rate of oil smoke particles can be increased.
Example 3.
A range hood with a non-constant rotating speed has the same other characteristics as embodiment 1, except that: the first controller and the second controller of the invention are both transformers.
The range hood with the non-constant rotating speed can adjust the rotating speed inside the range hood repeatedly, and greatly improves the oil absorption and deoiling effects. This oil smoke separator 1 still produces additional centrifugal force to the oil smoke gas, can effectively get rid of the oil smoke particle, can avoid containing a large amount of oil smoke particle gas and wind wheel 51 contact, improves the separation effect of oil smoke particle greatly and reduces because of the noise that wind wheel 51 accumulation oil stain produced.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A lampblack absorber of invariable rotational speed of non-, its characterized in that: the range hood is provided with a range hood main body, an oil fume separator, a variable speed motor and a variable speed fan, wherein the oil fume separator is in transmission connection with the variable speed motor;
the oil fume separator is provided with a plurality of concentric tubes with coincident center axes, a rotating shaft and a plurality of eaves structures, the rotating shaft is fixedly connected with one end of each concentric tube, the eaves structures are arranged in a surrounding manner and fixedly installed at the other end of the corresponding concentric tube, and the rotating shaft is in transmission connection with the variable speed motor;
the oil fume separator is also provided with an eddy current generating device group, the eddy current generating device group is fixedly arranged on the outer surface of the concentric tube and surrounds the joint of the eaves structure and the concentric tube, and the eddy current generating device group is arranged on the upper surface of the eaves structure;
each vortex generating device group consists of one or more vortex generating sub-devices in the same cornice structure;
the cigarette machine main part is provided with the shell, and the oil smoke separator rotation mounting is in the inside of shell, convulsions subassembly fixed mounting in the inside of shell, the shell is provided with a plurality of shell air inlets and the cyclic annular piece that matches with a plurality of shell air inlets, cyclic annular piece fixed mounting or integrated into one piece connect in the internal surface that the shell corresponds and with the edge that is located the shell air inlet, cyclic annular piece and shell air inlet one-to-one.
2. A non-constant speed range hood according to claim 1, wherein: the variable speed motor is provided with a first controller and a motor main body, and the first controller is electrically connected with the motor main body;
the variable speed fan is provided with a second controller and a fan main body, and the second controller is electrically connected with the fan main body.
3. A non-constant speed range hood according to claim 2, wherein: the first controller is a transformer or a frequency converter.
4. A non-constant speed range hood according to claim 2, wherein: the second controller is a transformer or a frequency converter.
5. A non-constant speed range hood according to claim 3 or 4, wherein: the air exhaust assembly is further provided with a wind wheel and a volute, the variable speed fan is assembled inside the volute, the wind wheel is in transmission connection with the variable speed fan, the volute is fixedly installed inside the cigarette machine main body, an air inlet of the volute is communicated with an air outlet above the concentric pipe, and an air outlet of the volute is communicated with an air outlet of the cigarette machine main body.
6. A non-constant speed range hood according to claim 5, wherein: defining one side of the oil fume separator, which faces the ground when the oil fume separator is installed, as a lower part, and sequentially defining concentric pipes from a middle shaft to the outside as a 1 st concentric pipe, an i concentric pipe, an n-1 concentric pipe and an n concentric pipe, wherein i is more than or equal to 2 and less than or equal to n, and n is a positive integer;
height of the 1 st concentric tube is H 1 The height of the ith concentric tube is H i Said n-1 concentric tubes have a height H n-1 The height of the n-th concentric tube is H n ，H 1 Has the maximum value of H n The value of (c) is minimal.
7. A non-constant speed range hood according to claim 6, wherein: the vortex generating device groups are m, m is any positive integer larger than 0, and the m vortex generating device groups are respectively fixedly arranged on the outer surfaces of the concentric pipes and surround the connecting part of the eaves structure and the concentric pipes;
the concentric tube is formed by a line segment consisting of a plurality of broken lines surrounding the middle shaft for a circle, and the intersection position of two adjacent line segments on the inner wall of the concentric tube is a vortex generation position;
the diameter of one end of the concentric tube is larger than that of the other end;
the other end of the concentric tube is fixedly connected with at least one eaves structure;
the concentric tube is provided with a flow disturbing device, and the flow disturbing device is connected to the tail end of one end of the concentric tube in a seamless surrounding manner.
8. A non-constant speed range hood according to claim 7, wherein: the cigarette machine main part is provided with oil catcher, and oil catcher assembles in the bottom of shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810188655.4A CN108167907B (en) | 2018-03-07 | 2018-03-07 | Range hood with non-constant rotating speed |
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| CN201810188655.4A CN108167907B (en) | 2018-03-07 | 2018-03-07 | Range hood with non-constant rotating speed |
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| CN108167907A CN108167907A (en) | 2018-06-15 |
| CN108167907B true CN108167907B (en) | 2022-12-30 |
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| CN107726409A (en) * | 2017-11-27 | 2018-02-23 | 佛山市云米电器科技有限公司 | A kind of high efficiency on-plane surface lampblack absorber |
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