CN112354309B - Oil smoke separator and range hood applying same - Google Patents

Abstract

The invention discloses an oil-smoke separating device, which comprises a rotary net disc, wherein the rotary net disc comprises a rotary shaft and blades which are connected with the peripheral wall of the rotary shaft and radially radiate outwards, and the oil-smoke separating device is characterized in that: the cross section of the blade is streamline, and the cross section is parallel to the axial direction of the rotary net disc. Also discloses a range hood applying the rotary net disk. Compared with the prior art, the invention has the advantages that: by using vanes of streamlined cross-section, the vortex can be eliminated.

Description

Oil smoke separator and range hood applying same

Technical Field

The invention relates to an oil fume purification device, in particular to an oil fume separation device and a range hood applying the oil fume separation device.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

In order to improve the oil-smoke separation efficiency, the existing range hood is usually provided with a rotating net in an air duct or a fan. The rotating centrifugal oil smoke separating device disclosed in the Chinese patent with the application number of 201420732722.1 comprises a rotating net disc and a wind wheel, wherein the rotating net disc is arranged at an air inlet of the wind wheel, the edge of the rotating net disc is connected with the edge of a front ring of the wind wheel, or the center of the rotating net disc is connected with the center of the wind wheel, or the rotating net disc and the front ring of the wind wheel are integrally formed.

Traditional rotatory rotary screen mainly has two kinds, one kind is that the fan is overhead, places in the oil net rear end, one kind is in the same place with the impeller coupling, still divide into plane and three-dimensional two kinds simultaneously, as above technique mainly has following not enoughly: firstly, in order to improve the separation efficiency of the rotary net without influencing the air volume, the preposed rotary net is realized by adopting a high-rotation-speed method, the rotation speed is up to 1200-1500r/min, the noise of the range hood can be influenced badly when the rotation speed is reached, and the noise is increased by at least 3 dB; secondly, the dynamic separation device is arranged on the impeller, the separated grease is thrown into the volute to cause pollution of the volute, the volute is used as an important part for pressurization, and the molded line of the volute is changed to directly influence the air performance of the fan; thirdly, the dynamic separation at ultrahigh rotating speed adopts the principle of collision separation, so that part of large oil drops can be broken, small particles in the discharged materials are increased, and the influence of oil smoke on the environment is not well reduced; the conventional blade has a circular section, and the blade with the section can generate more vortex at the rear end of the blade in the rotating process, so that energy loss is caused, and the improvement of filtering capacity is not facilitated.

As a front-end rotating network with high user acceptance, the problem that good filtering effect and noise experience cannot be achieved at present exists, and the specific expression is that the filtering effect is good when the rotating speed reaches 1200-1500r/min, but the noise is increased by more than 3 dB; in the pain point of the range hood, the smoking effect is first, the noise is second, and the cleaning, maintenance and filtration row is third. The result of the existing rotating net that noise is increased and the filtering capability is improved is lost.

In addition, a range hood is provided at present, and the oil fume separation efficiency is improved by arranging an electrostatic device. For example, the extractor hood disclosed in chinese patent application No. 201710363858.8 includes an electrostatic device, and a collection module of the electrostatic device is located downstream of a discharge module in a fume passing direction.

The existing electrostatic technology has a plurality of problems: the existing electrostatic technology has short service life, and generally needs to be detached for cleaning after about three months of use; secondly, the existing electrostatic technology has large volume; the prior static technology can generate crackle and crackle noise in the operation process, the use experience of a user is very poor as the electric mosquito swatter beats the mosquito, and the user also worrys about in the use process.

Therefore, there is a need for a technique that improves filtering capacity without sacrificing noise experience.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an oil-smoke separating device, which can eliminate the noise generated by high-speed rotation while ensuring the filtering effect.

The second technical problem to be solved by the invention is to provide a range hood with the oil-smoke separating device.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides an oil smoke separator, includes rotatory net dish, rotatory net dish includes the rotation axis and connects and be the radial outward radiation's of perisporium at the rotation axis blade, its characterized in that: the cross section of the blade is streamline, and the cross section is parallel to the axial direction of the rotary net disc.

To match the variation of the linear velocity of the blade, the blade is offset by an angle θ from the centerline of the first section near the axis of rotation₁The offset angle of the center line of the second section at the position of the blade farthest from the rotation axis is theta₂Theta to theta₂Is a gradual transition.

Preferably, the cross section of the blade is a combination of a semi-ellipse and a semicircle, and two end points of the semi-ellipse correspond to two end points of the semicircle respectively.

In order to eliminate the eddy current, reduce the system noise, simultaneously improve the filtering effect of the rotary screen disc and also avoid the air volume loss caused by the rotation of the rotary screen disc, the equation of any point M (x, y) on the ellipse is

Wherein v is₁The rising speed of the oil smoke is shown as the upward rising speed, and omega is the rotation angular speed of the rotating net disk; r is the distance of the point from the axis of rotation.

In order to reduce noise, the rotating speed of the rotating net disk is not more than 500 r/min.

In order to ensure the filtering effect after the rotating speed is reduced, the blades are made of high polymer materials, graphene is sprayed on the surfaces of the blades, the oil fume separation device further comprises a high-voltage source, and the blades can be electrically connected with the high-voltage source.

In order to facilitate connection of high-voltage electricity, a high-voltage connecting terminal is sleeved on the periphery of a rotating shaft of the rotating net disc and is electrically connected with a high-voltage source, and the high-voltage connecting terminal is in elastic contact with the rotating shaft and can supply the high-voltage electricity to the blades through the rotating shaft; the oil fume separation device also comprises a motor for driving the rotary screen disc to rotate, an output shaft of the motor is directly or indirectly connected to a rotating shaft of the rotary screen disc, and the motor and the rotating shaft are insulated.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a range hood, its characterized in that: the oil fume separation device is applied.

In order to be convenient for bearing the oil-water mixture thrown out by the rotary net disc, the range hood also comprises a guide plate, wherein an annular groove is formed in the guide plate and is positioned on the periphery of the rotary net disc.

In order to facilitate the received oil-water mixture to flow into an oil cup of the range hood and to facilitate the disassembly and assembly of the rotary net disc, the annular groove forms a certain inclination angle with the horizontal direction.

Compared with the prior art, the invention has the advantages that:

1) the vortex can be eliminated by adopting the blades with streamline sections;

2) the variable angle dynamic blade is designed, so that the vortex generated in the rotating process is further eliminated, and the noise generated by the vortex is reduced;

3) the vanes with specific elliptic cross sections are adopted, the speed of the oil smoke in the vertical direction and the rotating direction is considered, on one hand, the vortex can be eliminated, the system noise can be reduced, on the other hand, the filtering effect of the rotating net disc can be obviously improved due to the increase of the surface area of the vanes, and the air volume loss caused by the rotation of the rotating net disc can be effectively avoided;

4) the rotating speed of the preposed rotary net disc is reduced, and the noise generated by cutting air is reduced;

5) the blade can realize electrostatic absorption, utilizes electrostatic absorption to realize better particulate matter filtering purification effect.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

fig. 2 is a sectional view (front-rear section) of a range hood according to an embodiment of the present invention;

fig. 3 is a sectional view (left-right direction section) of the range hood according to the embodiment of the present invention;

fig. 4 is a schematic view of a rotary net disk and a deflector of the range hood according to the embodiment of the invention;

fig. 5 is a schematic view of a deflector of the range hood according to the embodiment of the present invention;

fig. 6 is a schematic view (from a paraxial point) of the blades of the rotating mesh disk of the oil smoke separating device according to the embodiment of the present invention;

fig. 7 is a schematic view (from a far-axis point) of the blades of the rotating mesh disk of the oil smoke separating device according to the embodiment of the present invention;

FIG. 8 is a schematic of the soot and rotational speed of a prior art circular cross-section blade;

FIG. 9 is a schematic diagram of the soot lift velocity of a prior art circular cross-section vane;

fig. 10 is a schematic view (a paraxial point) of the oil smoke rising speed of the blades of the rotary mesh disc of the oil smoke separating device according to the embodiment of the present invention;

fig. 11 is a schematic view (a far axis point) of the oil smoke rising speed of the blades of the rotating mesh plate of the oil smoke separating device according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 4, a range hood, which is a ceiling range hood, includes a fume collecting hood 1, a fan frame 2 disposed above the fume collecting hood 1, and a fan system 3 disposed in the fan frame 2 (in fig. 2 and 3, an impeller of the fan system 3 is hidden).

The oil smoke separating device includes a rotary mesh plate 41, a motor 42, a high voltage connection terminal 43, and a high voltage source 44. An air inlet 11 is formed at the joint of the smoke collecting cover 1 and the fan frame 2, and a rotary net disc 41 is arranged at the air inlet 11. The rotating mesh plate 41 may be disposed at other positions as long as it is located in the air duct of the range hood and upstream of the fan system 3 on the oil smoke flow path.

The rotary screen 41 includes a rotary shaft 411, and blades 412 connected to a peripheral wall of the rotary shaft 411 to radiate radially outward. An output shaft of the motor 42 may be directly or indirectly connected to a rotation shaft 411 of the rotary screen disc 41, so that the rotary screen disc 41 can be driven to rotate about the rotation shaft 411. The rotary net disk 41 and the motor 42 are insulated from each other, so that high-voltage electricity is prevented from being transmitted to the motor 42. The high voltage connection terminal 43 is in contact with the rotary screen 41 by means of elastic connection, and charges the rotary screen 41. In this embodiment, the high voltage connection terminal 43 is in a sleeve shape and is sleeved on the outer circumference of the rotation shaft 411. The high voltage source 44 may be disposed on the top of the blower housing 2 and electrically connected to the high voltage connection terminal 43.

In the using process, the motor 42 drives the rotating mesh disc 41 to rotate at a lower rotating speed, such as 500r/min, the high-voltage source 44 generates high voltage, the high voltage is transmitted to the rotating shaft 411 of the rotating mesh disc 41 through the high-voltage connecting terminal 43, graphene is sprayed on the surfaces of the rotating shaft 411 and the blades 412, the high voltage is distributed on the surface of the rotating mesh disc 41 through the graphene, when oil smoke passes through the rotating mesh disc 41, a part of the oil smoke is filtered due to collision and adsorption with the rotating mesh disc 41, and then the oil smoke is thrown and released to the outer edge along the rotating mesh disc 41 under the action of centrifugal force; part of the oil smoke actively deflects to the surface of the rotating mesh disc 41 under the action of electrostatic adsorption force, actively collides with the surface of the rotating mesh disc 41, and is thrown off to the outer edge under the action of centrifugal force; the filtration efficiency is improved by two filtration methods.

To achieve low noise, noise reduction is achieved by reducing the rotational speed, on the one hand, and by the vortex-reducing design of the blades 412, on the other hand.

When the dynamic blades separate oil smoke particles, oil smoke is mainly subjected to forces in two directions, one is an upward lifting force generated by negative pressure and is generally a wind speed of 2-4m/s, and the other is a tangential force generated by rotation of the dynamic blades and is distributed on a dynamically rotating parallel plane because of the linear velocity v of the dynamic blades₂Since r ω (ω is a rotation angular velocity) is related to a rotation radius, there is a deviation of a separation vortex at any point of the dynamic blade from each other, which causes energy consumption and noise.

In view of the above situation, the blade 412 of the present invention can reduce the wind resistance generated by the rotation of the dynamic blade, increase the contact area, improve the filtering capability, eliminate the vortex, and reduce the vortex noise. Compared with the similar technology on the market at present, the filtering effect of the filtering system can be improved, noise can not be generated on products, and the filtering system can be used for a long time.

The cross-section of the blade (spoke) of traditional rotatory net dish is mostly circular cross-section or square cross-section, compares in square cross-section, and circular cross-section's vortex condition is better, but also can produce more vortex. The cross section herein means a cross section parallel to the axial direction of the rotary screen 41. Taking a circular cross section as an example, referring to fig. 8, an upward arrow indicates a soot velocity direction, and a leftward arrow indicates a rotation velocity direction of the rotary screen disc. Referring to FIG. 9, the arrows indicate the path of the soot flow, the velocity v of the soot₁Vertically upwards, v₂The speed is opposite to the speed of the rotary net disc, and the resultant speed of the two speeds is the diagonal speed of the two speeds, i.e. v₃The circular cross section generates vortex, and the vortex is symmetrical v₃And (4) distribution.

In the present invention, the cross-section of the blade 412 is streamlined to eliminate the vortex. Linear velocity v due to dots₂R ω is the radius of rotation of the point, ω is a fixed value, so, on a cross section, v₂Are different from place to place, so the corresponding angle is gradual. Referring to FIGS. 6 and 10, v is the first section 4121 of the vane 412 near the location of the axis of rotation 411 (near-axis point)₃And v₂Is theta₁Referring to fig. 7 and 11, on the second section 4122 of the vane 412 at the farthest position (the distant axis point) from the rotation axis 411, v thereof₃' and v₂Is theta₂，θ₁To theta₂Is a gradual transition. That is, θ₁And theta₂Unlike, the cross-section of the blade 412 is of a variable angle design.

The flowing direction of the air at any point is related to the linear velocity of the point, so the angular offset of the vortex-eliminating design center line at any point on the blade 412 (in the vertical state of the rotating shaft 411, the angular offset of the center line is the included angle between the center line and the horizontal direction) should meet the formula

Wherein v is₁And ω is a fixed value in the operating state, as described above;

r is the distance from the point to the axis of rotation 411;

to reduce vortex generation, the cross-section of the blade 412 is formed by a combination of a semi-ellipse and a semi-circle, wherein the semi-ellipse is used for vortex elimination, and the equation of any point M (x, y) on the ellipse is

Wherein v is₁And ω is a constant;

r is the distance of the point from the axis of rotation 411. In the above equation, the coordinate is established in the same manner as in the conventional ellipse equation. The two end points of the semi-ellipse correspond to the two end points of the semi-circle respectively.

Through the analysis, the speed of the oil smoke in the vertical direction and the rotating direction is considered through the blades 412 designed by the formula, on one hand, the vortex can be eliminated, the system noise can be reduced, on the other hand, the filtering effect of the rotating mesh disc 41 can be obviously improved due to the increase of the surface area of the blades 412, and the air volume loss caused by the rotation of the rotating mesh disc 41 can be effectively avoided.

Referring to fig. 2 and 5, a guide plate 5 is arranged on the periphery of the rotary screen disc 41, an annular groove 51 is formed in the guide plate 5, the annular groove 51 is located on the periphery of the rotary screen disc 41 and used for receiving oil-water mixtures thrown off by the rotary screen disc 41, a certain inclination angle is formed between the annular groove 51 and the horizontal plane, and the annular groove 51 gradually inclines downwards from front to back and is matched with an oil cup below the rear side of the smoke collection cover 1. The preferred 15 that is of inclination, on the one hand can be so that the oil in the ring channel 51 flows down, and on the other hand can convenience of customers gets and puts rotatory net dish 41, easily takes out from fan frame 2, promotes user's dismouting and experiences.

In conclusion, the oil-smoke separating device of the invention achieves the purposes of eliminating the noise generated by high-speed rotation and ensuring equal or better filtering effect. Noise cancellation is mainly achieved by two aspects: 1) reducing the rotating speed of the preposed rotating net disc 41, and reducing the existing rotating speed of 1200-1500r/min to be not more than 500r/min, so as to reduce the noise generated by cutting air; 2) the variable-angle dynamic blade is designed to eliminate vortex generated in the rotating process and reduce noise generated by the vortex.

In order to ensure equal or even better filtering effect, the method is mainly realized by a blade electrostatic adsorption scheme: because the filtering principle of the rotary screen disc 41 is that the collision separation probability is increased by high-speed rotation, the filtering efficiency of the rotary screen disc 41 is locally weakened after the rotating speed is reduced, in order to recover the filtering efficiency, the blades 412 of the rotary screen disc 41 are made of high polymer materials, graphene is sprayed on the surfaces of the blades 412, the rotary screen disc 412 is electrified integrally, the surfaces of the rotary screen disc 412 are provided with static electricity, and the better filtering and purifying effect of the particles is realized by utilizing the electrostatic adsorption.

Claims (9)

1. A kind of soot separating device, including rotating the mesh disc (41), the said rotating mesh disc (41) includes the rotating shaft (411) and connects to the perisporium of the rotating shaft (411) and presents the radial blade (412) that radiates outwards, characterized by that: the section of the blade (412) is streamline, the section is parallel to the axial direction of the rotary screen disc (41), and the deviation angle of the central line of the first section (4121) of the blade (412) close to the rotating shaft (411) is theta₁The offset angle of the center line of the second section (4122) at the position where the vane (412) is farthest from the rotation axis (411) is theta₂，θ₁To theta₂Is a gradual transition.

2. The oil fume separation device according to claim 1, characterized in that: the section of the blade (412) is combined by a semi-ellipse and a semicircle, and two end points of the semi-ellipse correspond to two end points of the semicircle respectively.

3. The oil fume separation device according to claim 2, characterized in that: the equation of any point M (x, y) on the ellipse is

Wherein v is₁The rising speed of the oil smoke is shown as omega, and the rotating angular speed of the rotating net disc (41) is shown as omega; r is the distance from the point to the axis of rotation (411).

4. The oil fume separation device according to any one of claims 1 to 3, characterized in that: the rotating speed of the rotating net disc (41) is not more than 500 r/min.

5. The oil fume separation device according to claim 4, characterized in that: the blade (412) is made of high polymer materials, graphene is sprayed on the surface of the blade (412), the oil smoke separation device further comprises a high-voltage source (44), and the blade (412) can be electrically connected with the high-voltage source (44).

6. The oil fume separation device according to claim 5, characterized in that: a high-voltage connecting terminal (43) is sleeved on the periphery of a rotating shaft (411) of the rotating net disc (41), the high-voltage connecting terminal (43) is electrically connected with a high-voltage source (44), and the high-voltage connecting terminal (43) is in elastic contact with the rotating shaft (411) so that high voltage can be applied to the blade (412) through the rotating shaft (411); the oil smoke separating device also comprises a motor (42) for driving the rotary mesh disc (41) to rotate, an output shaft of the motor (42) is directly or indirectly connected to a rotating shaft (411) of the rotary mesh disc (41), and the motor (42) and the rotating shaft (411) are insulated.

7. A range hood, its characterized in that: the oil fume separation device of any one of claims 1 to 6 is applied.

8. The range hood of claim 7, wherein: the range hood still wraps guide plate (5), be formed with annular groove (51) in guide plate (5), annular groove (51) are located the periphery of rotatory net dish (41).

9. The range hood of claim 8, wherein: the annular groove (51) forms a certain inclination angle with the horizontal direction.

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