CN211176964U

CN211176964U - Net cover, fan and range hood

Info

Publication number: CN211176964U
Application number: CN201921941199.2U
Authority: CN
Inventors: 李佳阳; 蒋济武; 彭小康; 黎本锋
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-08-04
Anticipated expiration: 2029-11-11
Also published as: WO2021093068A1

Abstract

The utility model discloses a screen panel, fan and lampblack absorber, wherein, screen panel one side is the air inlet side, and the opposite side is the air-out side, the screen panel includes: an outer frame body; the grid, the grid is located the outer frame is inboard, the grid is close to the width of air inlet side is greater than it is close to the width of air-out side. The utility model makes the width of the air outlet side of the grid bar smaller than that of the air inlet side, so that when the flue gas enters the mesh enclosure, the air inlet vortex area generated at the air outlet side is reduced, thereby avoiding the air flow from generating turbulence at the air outlet side of the mesh enclosure, and being beneficial to reducing the wind resistance of the mesh enclosure; the mesh enclosure is used for the fan, so that the utilization efficiency of the fan can be improved; through being used for the lampblack absorber with above-mentioned fan, can improve the smoking efficiency of lampblack absorber, help reducing the noise of lampblack absorber simultaneously.

Description

Net cover, fan and range hood

Technical Field

The utility model relates to a kitchen appliance field, in particular to screen panel, fan and lampblack absorber.

Background

The range hood adopts a motor to drive the impeller to rotate, and oil smoke is discharged through negative pressure. The impeller has a relatively high linear velocity and relatively sharp edges during rotation, and therefore a safety net is installed to prevent the cigarette maker from being injured by a user's finger contacting the rotating member during operation.

To the cigarette machine that adopts injection structure fan system, for guaranteeing the structural strength of safety net needs to be constituteed the grid of safety net has great width, and for convenient processing, the cross-section that makes the grid is the rectangle usually, in the flue gas gets into the impeller through the passageway between the grid, the flue gas flows the in-process along the grid surface to the impeller, and the air-out side that is close to the safety net can produce the vortex, forms the vortex that drops, influences the flow of gas to the impeller in, has reduced the intake of impeller, influences the operating efficiency of cigarette machine.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective provides a screen panel, fan and lampblack absorber, aims at improving the big problem of current air inlet screen panel windage.

In order to achieve the above object, the utility model provides a mesh enclosure, mesh enclosure one side is the air inlet side, and the opposite side is the air-out side, the mesh enclosure includes:

an outer frame body;

the grid, the grid is located the outer frame is inboard, the grid is close to the width of air inlet side is greater than it is close to the width of air-out side.

When the air current flows to the air-out side from the air inlet side, because the width of the air-out side of the grid is smaller than the air inlet side, when the air current flows to the air-out side along the grid, the wake flow at one end of the air-out side of the grid is not easy to generate vortex, so that the generation of falling vortex of the air current at the air-out side of the grid is reduced, the wind resistance of the air-out side of the grid is effectively reduced, and the air inlet amount of the mesh enclosure is increased.

Optionally, the width of the grid is gradually narrowed and smoothly transited from the air inlet side to the air outlet side.

Through adopting smooth transition's structure for the air current can be followed the bars surface and flowed by air inlet side to the air-out side, avoids the air current to produce unnecessary at the bars surface and turns to, and then can reduce the vortex that drops.

By using a smooth transition structure, the problem of flow separation caused by too fast narrowing of the grid width can be avoided.

Optionally, one end of the grid close to the air inlet side is an arc-shaped surface; and/or the presence of a gas in the gas,

one end of the grid bars, which is close to the air outlet side, is an arc surface.

When the air current reaches the air inlet side, the air current contacts one end of the air inlet side of the grid, under the action of the arc-shaped surface, the air current at each angle can smoothly turn along the surface of the grid, so that the air current flows from the air inlet side to the air outlet side more, and a better flow guide effect is achieved.

When the air current reaches the air-out side, the air-out side of the arc-shaped grid bars is guided downwards, so that the air current flows towards the inner direction of the net cover, the phenomenon that too large resistance is generated on the air current when the width of the air-out side of the grid bars is too large is avoided, and the phenomenon that the air current flows and is separated due to the fact that the air-out side of the grid bars is narrowed too small can also be avoided.

Optionally, the width of the grid bars at the end close to the air outlet side is H2, wherein H2 is not less than 0.5mm, and H2 is not more than 1.5 mm.

By adopting the width range, the air conditioner can be conveniently processed and molded, and meanwhile, the excessive resistance to the air flow can be avoided; through making the width of bars is not more than 1.5mm, can prevent the problem that the air-out side wake vortex of bars drops.

Optionally, by the air inlet side direction the air-out side, the extending direction of bars with the axial of screen panel is the contained angle setting.

When the air current flows from the air inlet side to the air outlet side, the air current flows along the surface of the grid bars, and the grid bars arranged at included angles are adopted, so that the effect of diversion can be achieved when the air current flows, the air current flows to the action surface of the impeller of the fan, and the utilization efficiency of the fan is improved.

Optionally, the grid bars are arranged along the circumferential direction of the mesh enclosure, radial ribs are arranged on the inner side of the outer frame body, and the adjacent grid bars are connected through the radial ribs. The circumferential grid bars are connected by adopting the radial ribs in the airflow, so that the deformation resistance of the grid bars can be improved, and the grid bars have higher stability.

Optionally, the radial ribs divide the grid bars into at least two airflow passing areas, and adjacent airflow passing areas have unequal included angles between the extending directions of the grid bars and the axial direction of the mesh enclosure.

Through adopting above-mentioned setting, through each the air current gets into through distinguishing the inboard air current flow direction of screen panel is different, and then can carry out the water conservancy diversion to the air current better, avoids the air current to be in the play wind side of screen panel produces the vortex, simultaneously, when being used for the fan of non-axial air inlet, can design according to each regional intake difference of fan the contained angle makes the contained angle of bars and the intake that corresponds the region correspond to carry out the water conservancy diversion according to the amount of wind in different regions, make the regional air current water conservancy diversion effect of different intakes keep the optimum state.

Optionally, the air inlet side is oriented to the air outlet side, and the side edge of the grid in the width direction is β degrees from the axial direction of the mesh enclosure, wherein β is not greater than 45 degrees.

Through adopting above-mentioned design, can make the water conservancy diversion effect of air current better, simultaneously, the bars do not obstruct the air current to the inside flow of screen panel.

The utility model discloses on the basis of above-mentioned screen panel, provide a fan, the air intake of fan is equipped with the aforesaid screen panel.

When the fan operates, the air flow is driven to flow into the fan, and under the action of the mesh cover, the wind resistance generated in the air inlet process of the fan is smaller, and the utilization rate of the fan is higher.

Optionally, an air guide ring is arranged at an air inlet of the fan, one end of the air guide ring is an air inlet end, the other end of the air guide ring is an air outlet end, and the air outlet end is provided with a flow guide inclined plane.

The air guide ring plays a role in guiding air flow entering the fan, so that the air flow on the outer edge of the fan can flow towards the fan along the air guide ring under the negative pressure effect of the fan, and the air flow can be guided by the guide inclined plane, so that acting force generated by the fan can act on the air flow more, and the utilization rate of the fan is improved.

Optionally, the fan is a centrifugal fan, the air inlet end extends towards the air outlet end, and the diversion inclined plane extends towards the direction close to the impeller of the fan.

In the centrifugal fan, the impeller drives airflow to flow in the rotating process, and the airflow can flow along the flow guide inclined plane by enabling the flow guide inclined plane to flow towards the impeller, so that the airflow is prevented from generating eddy at the air outlet end of the air guide ring, and the utilization rate of the fan can be improved.

The utility model discloses on the basis of above-mentioned fan, provide a lampblack absorber, optionally, the lampblack absorber is equipped with the aforesaid the fan.

Through adopting above-mentioned fan structure the lampblack absorber operation, the screen panel can play certain effect of blockking oil and dripping, can reduce simultaneously the windage of fan helps improving the operating efficiency of lampblack absorber. Through setting up the screen panel can prevent that the user from pointing the rotary part of contact fan, improves the security of lampblack absorber.

The technical proposal of the utility model is that the width of the air outlet side of the grid is smaller than that of the air inlet side, so that when the flue gas enters the mesh enclosure, the air inlet vortex area generated at the air outlet side is reduced, thereby avoiding the falling vortex generated at the air outlet side of the mesh enclosure by the air flow and being beneficial to reducing the wind resistance of the mesh enclosure; the mesh enclosure is used for the fan, so that the utilization efficiency of the fan can be improved; through being used for the lampblack absorber with above-mentioned fan, can improve the smoking efficiency of lampblack absorber, help reducing the noise of lampblack absorber simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of a mesh enclosure according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a partial enlarged view of the portion B in FIG. 3;

FIG. 5 is a schematic view of the airflow path in the prior art grid;

fig. 6 is a schematic view of an airflow path in an embodiment of the present invention when the grid bar is in use;

FIG. 7 is a schematic view of an air flow path on the air inlet side in a prior grid use state;

fig. 8 is a schematic view of an air flow path on the air inlet side in an embodiment of the present invention;

fig. 9 is a schematic view of a fan according to an embodiment of the present invention;

FIG. 10 is a rear view of FIG. 9;

FIG. 11 is a cross-sectional view taken along line C-C of FIG. 10;

FIG. 12 is an enlarged view of a portion D of FIG. 11;

fig. 13 is a schematic structural diagram of the range hood in an embodiment of the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic diagram of a mesh enclosure structure according to an embodiment of the present invention, fig. 2 is a front view of fig. 1, fig. 3 is a sectional view from a-a in fig. 2, and fig. 4 is a partial enlarged view of a portion B in fig. 3, the present invention provides a mesh enclosure 20, wherein one side of the mesh enclosure 20 is an air inlet side 21, and the other side is an air outlet side 25, and the mesh enclosure 20 includes: an outer frame body 24; the grid bars 22 are arranged on the inner side of the outer frame body 24, and the width of the grid bars 22 close to the air inlet side 21 is larger than that of the grid bars 22 close to the air outlet side 25. The outer frame body 24 forms the outer frame of screen panel 20 can be used for simultaneously the interconnect of screen panel 20 and other structures, the bars 22 set up in the outer frame body 24 is inside, and is adjacent form inlet air channel between the bars 22, the air current by air inlet side 21 is followed inlet air channel gets into air-out side 25, and partial air current can be followed the bars 22 surface flows.

Referring to fig. 5, fig. 5 is a schematic view of an airflow path in a using state of a conventional grid, in order to facilitate processing and forming, a conventional grid 22 is generally rectangular, when airflow flows along the surface of the grid 22, a vortex is generated on an air outlet side 25 of the grid 22, so that airflow disturbance is easily generated on the air outlet side 25 of the grid 22, when the airflow flows from the air inlet side 21 to the air outlet side 25, an air inlet vortex area 26 is very large, when a shedding vortex is generated on the air outlet side 25, the airflow is blocked from flowing to the air inlet side 21, and further, the airflow receives very large resistance at a position close to the grid 22, so that the air inlet efficiency of the air inlet channel is affected; in order to ensure the strength of the grid bars 22, generally, the number of the grid bars 22 is relatively large, and the air inlet vortex region 26 on the air outlet side 25 of the grid bars 22 directly causes blockage to the air flow, and influences the air inlet amount of the mesh enclosure 20.

Please refer to fig. 6, fig. 6 is a schematic diagram of airflow paths in a grid using state according to an embodiment of the present invention, in this scheme, since the width of the grid 22 near the end of the air outlet side 25 is smaller than the width of the grid 22 near the air inlet side 21, when the airflow flows along the surface of the grid 22 toward the air outlet side 25, and the airflow is greatly reduced in the air inlet vortex region 26 generated at the end of the grid 22 near the air outlet side 25, thereby reducing the disturbance of the air inlet vortex region 26 to the airflow, reducing the resistance of the grid 22 to the airflow, correspondingly increasing the air inlet efficiency of the grid 22, and increasing the air intake amount of the grid 22.

The width of the air outlet side 25 of the grid bars 22 is designed to be smaller than the width of the air inlet side 21 of the grid bars, so that the area of an air inlet vortex area 26 generated by air flow flowing to the air inlet side 21 of the mesh enclosure 20 along the surface of the grid bars 22 is reduced, the falling vortex of the air inlet vortex area 26 to the air flow is avoided, the falling vortex is conveyed to the air outlet side for a vortex structure with flow separation, the falling vortex can cause resistance and noise on the air outlet side, most of the air flow enters the air inlet area along an air inlet channel between the adjacent grid bars 22, and after the air inlet vortex area 26 of the air inlet side 21 is reduced, the falling vortex range of the air flow which can be generated by the air inlet side 21 of the grid bars 22 to the air flow is greatly reduced, the blocking effect of the grid bars 22 to the air flow is reduced, and the air inflow of the.

Please continue to refer to fig. 3 and 4, in an embodiment of the present invention, the air inlet side 21 faces the air outlet side 25, the width of the grid 22 is gradually narrowed and smoothly transited, and the surface of the grid 22 forms a smooth flow guiding surface gradually transited, so that the flue gas can keep a relatively determined movement track when flowing along the surface of the grid 22, thereby avoiding unnecessary turning of the air flow on the surface of the grid 22, and further avoiding the generation of the vortex outside the grid 22.

The cross-section of grid 22 can be the water droplet shape of gradual transition, also can be other similar shapes, so that the width of grid 22 narrows gradually, the air current by air inlet side 21 to air-out side 25 flow in-process does not have the position of width sudden increase, when the flue gas along grid 22 surface to air-out side 25 direction flow, the air current can not be in under the effect on grid 22 surface suddenly to adjacent air inlet channel between the grid 22 turns to, and then reduces air inlet channel between the grid 22 appears and drops the vortex, makes the air current can be by air inlet side 21 to the air circuit that air-out side 25 extends flows.

Referring to fig. 7, fig. 7 is a schematic view of an air flow path at an air inlet side in a use state of a conventional grid, when air flows in a grid 22 with a rectangular cross section, because an air inlet side 21 of the grid 22 with the rectangular cross section is provided with an edge angle, when the air flow enters non-axially, the air flow passing through the edge angle generates a very large air inlet vortex region 26 at a leeward side of the grid 22, so that a very large shedding vortex is generated at the leeward side of the grid 22, when the grid is actually used, an air inlet amount at a windward side of the grid 22 is large, air hardly enters at the leeward side, space of the grid 22 is wasted, and simultaneously, because the air inlet vortex region 26 generated at the leeward side is very large, a large part of air inlet channels are occupied, and an air inlet amount of the mesh enclosure 20 is greatly reduced.

Referring to fig. 8, fig. 8 is a schematic view of an air flow path at an air inlet side in an operating state of the grill according to an embodiment of the present invention, in order to adapt to structures with air inlets in different directions, in an embodiment of the present invention, one end of the grill 22 close to the air inlet side 21 is an arc surface, so as to reduce the blockage of the air inlet side 21 of the grill 22 to the air flow.

When the air current flows along the surface of the grid 22, because the surface of the grid 22 close to the air inlet side 21 is an arc-shaped surface, the grid 22 has no edges and corners, and the air current is greatly reduced in an air inlet vortex region 26 generated on the leeward side of the grid 22, so that the resistance of the leeward side edge of the grid 22 to the air current is reduced, the increase of the air flow on the leeward side of the grid 22 is facilitated, and the air inlet amount of the grid 22 is increased.

The section of the grid 22 close to the air inlet side 21 can be oval or circular, and the section shape of the air inlet side 21 of the grid 22 can be determined according to the wind direction of the mounting position of the mesh enclosure 20, so that the blocking effect of the grid on the air flow is as small as possible.

Please continue to refer to fig. 6, in an embodiment of the present invention, one end of the grid 22 close to the air-out side 25 is an arc surface, when the air current flows along the grid 22, when the grid 22 is close to the air-out side 25 is an arc surface, the air-out side 25 of the grid 22 has no edge angle, the area of the air-in vortex region 26 generated by the air current flowing along the grid 22 at the air-out side 25 of the grid 22 is further reduced, and then the vortex of the grid 22 dropping off the air current is reduced, and the air output of the grid 22 is further increased.

When the grid bars 22 correspond to different fans 11, because the airflow directions corresponding to the grid bars 22 in different fans 11 are different, when the air conditioner is installed, the radian of the arc-shaped surface of the air outlet side 25 of the grid bars 22 can be changed according to the airflow directions, so that the air outlet side 25 of the grid bars 22 can play a role in guiding the flow.

Optionally in this embodiment, the width that grid 22 is close to air-out side 25 one end is H2, and 0.5mm is less than or equal to H2 and is less than or equal to 1.5mm, and when processing, the width of air-out side 25 of grid 22 is greater than 0, and then avoids the air current to be in following when grid 22 surface flows, the air current is followed grid 22 surface to air-out side 25 flows the air-out side 25 of grid 22 produces the air current offset that acutely shunts and lead to, and then avoids producing the vortex that drops.

When the width of the grid bars 22 is too large, the air inlet channel between adjacent grid bars 22 is too narrow, and the air flow is blocked. Through adopting above-mentioned width setting, can realize through the effect that bars 22 reduce the 26 areas in air inlet vortex region, can conveniently carry out injection moulding to bars 22, make it have certain resistance to deformation, also difficult damage when the machine-shaping.

Referring to fig. 4, when the airflow direction of the air outlet side 25 of the grid 22 is different from the axial direction of the fan 11, in order to achieve a better flow guiding effect, in an embodiment of the present invention, the air inlet side 21 is directed to the air outlet side 25, the extending direction of the grid 22 is arranged at an included angle with the axial direction of the mesh enclosure 20, and an inclined air inlet channel is formed between adjacent grids 22.

As shown in fig. 4, the air inlet side is oriented toward the air outlet side, the direction M1 is the extending direction of the side edge of the width direction of the grid 22, the direction M in the drawing is the axial direction of the mesh enclosure 20, when the airflow flows along the surface of the grid 22, the airflow flows toward the air inlet side along the extending direction of the grid 22 under the action of the grid 22, and when the mesh enclosure 20 is installed on a specific fan 11 and the airflow direction of the corresponding fan 11 is not consistent with the axial direction thereof, the extending direction of the grid 22 is consistent with the airflow direction of the fan 11, so that the grid 22 can play a role in guiding the airflow.

When the input direction of air current is inconsistent with the axial of fan 11, bars 22 one side is towards the air current inflow direction, for the windward side, and the opposite side dorsad air current flow direction, for the leeward side, through making bars 22 contained angle sets up, can reduce the windward side of bars 22 blocks the air current, increases inlet air channel's width reduces the air current resistance.

When processing, work as it is close to establish bars 22 when the air inlet side 21 is the arc surface, with be the contained angle setting bars 21 cooperate, make the air inlet vortex district 26 that the leeward side of bars 21 produced is minimum as far as possible, and then is littleer to the vortex scope that the air current produced, and the windage is also corresponding littleer.

Optionally in this embodiment, the grid bars 22 are arranged along the circumferential direction of the mesh enclosure 20, the inner side of the outer frame 24 is provided with radial ribs 23, the adjacent grid bars 22 are connected through the radial ribs 23, the grid bars 22 and the radial ribs 23 form a grid structure, and the strength of the mesh enclosure 20 is enhanced through the radial ribs 23, so that the grid bars 22 form a stable circumferential distribution state.

Further optionally, the radial ribs 23 divide the grid bars 22 into at least two airflow passing areas, adjacent airflow passing areas are arranged, included angles between the extending directions of the grid bars 22 and the axial direction of the mesh enclosure 20 are not equal, when the fan 11 is not axially air-intake, airflow directions of different airflow passing areas of the fan 11 are also different, and by making different inclination angles of the different airflow passing areas of the grid bars 22 different, the different airflow passing areas of the grid bars 22 correspond to different air-intake areas of the fan 11, so that the angle of the grid bars 22 of each air-intake area is consistent with the airflow direction and airflow rate of the corresponding airflow passing area, and resistance of the grid bars 22 to the airflow is reduced.

Because the inclination angles of the grid bars 22 in the airflow passing areas are different, the eddy of the airflow on the air outlet side 25 is disturbed, the airflow on the air outlet side 25 of each airflow passing area is not easy to generate the eddy, and the noise of the fan 11 is reduced.

Taking the grid 22 with two airflow passing areas and the fan 11 as a centrifugal fan as an example, in an air inlet area with a large airflow flow, the axial inclination angle between the grid 22 and the fan 11 is relatively small, so that the airflow can dispersedly flow along the preset air path direction of the fan 11, the airflow can dispersedly flow towards the blades 13 of the centrifugal fan, and the airflow is prevented from being larger than the maximum action amount of the fan 11; for the area where the airflow has a small flow rate, the inclination angle of the grid 22 may be relatively large, so that the airflow can be concentrated toward the end of the blade 13 of the fan 11 close to the air inlet under the action of the grid 22, so that the blade 13 can fully act on the airflow to avoid the loss of the air.

Optionally in this embodiment, by the air inlet side is to the air outlet side direction, the extending direction M1 that the width direction side of the grid 22 was followed with the contained angle of the axial M of the screen panel 20 is β, wherein β is less than or equal to 45 °, when the inclination that the width direction side of the grid 22 was followed is too big, the grid 22 can produce great blocking effect to the air current, reduces adjacently the width of the air inlet channel between the grid 22, causes the air current through rate of the screen panel 20 to reduce.

When processing, the extending direction of the width direction side edge of the grid 22 and the axial included angle of the mesh enclosure 20 can be designed to be 30 degrees, so that the mesh enclosure has a certain flow guide effect and does not block the flow direction of air flow in a large amount.

When the side edge of the grid 22 in the width direction is a straight line, the direction M1 is an included angle between the extension direction of the straight line and the axial direction M of the mesh enclosure 20; when the side edge of the grid 22 in the width direction is a curve, the M1 direction is an included angle between the extending direction of the chord of the curve and the axial direction M of the mesh enclosure 20.

When the grid 22 is provided with a plurality of air inlet regions, the angle settings of the grid 22 in each air inlet region may be the same or different, and the design of the grid 22 in each air inlet region may be determined according to the installation position of the fan 11 corresponding to the mesh enclosure 20.

The utility model discloses on above-mentioned screen panel 20's basis, provide an embodiment of fan.

Referring to fig. 9 and 10, fig. 9 is a schematic view of a fan structure according to an embodiment of the present invention, fig. 10 is a rear view of fig. 9, an air inlet of the fan 11 is provided with the mesh enclosure 20 described in the above embodiment, when the fan 11 is a single-side air inlet, the mesh enclosure 20 is disposed at one end of the fan 11, and when the fan 11 is a double-air inlet, the mesh enclosure 20 may be disposed at both air inlets.

Through adopting the aforesaid screen panel 20, the air current passes through when screen panel 20 gets into air-out side 25, the air inlet vortex district 26 that the air current produced reduces, makes fan 11's noise greatly reduced, simultaneously, the grid 22 reduces the vortex that drops that the air current produced, and then makes gas flow increase, helps improving fan 11's utilization ratio.

The fan 11 is generally provided with a motor, and the motor drives the blades 13 to rotate, so as to apply work to the gas.

Optionally, in this embodiment, an air guide ring 14 is disposed at an air inlet of the fan 11, one end of the air guide ring 14 is an air inlet end 16, the other end of the air guide ring 14 is an air outlet end 17, the air outlet end 17 is provided with a flow guide inclined plane 15, and the flow guide inclined plane 15 is used for guiding the air flow close to the air guide ring 14 to the area of the blade 13 of the fan 11, so that the blade 13 of the fan 11 can act on the air flow.

The air guide ring 14 is annularly arranged on an air inlet of the fan 11, and air flow is conveyed to the air outlet end 17 from the air inlet end 16 along the air guide ring 14, so that the air guide ring 14 can guide air. The gas flows along the flow guide inclined plane 15, so that the gas is prevented from generating vortex at the air outlet end 17 of the air guide ring 14, and the wind resistance caused by the vortex is reduced.

The fan 11 further includes other functional components, which may refer to the prior art and are not described in detail.

Referring to fig. 11 and 12, fig. 11 is a cross-sectional view taken along the direction C-C in fig. 10, fig. 12 is a partially enlarged view of the portion D in fig. 11, in this embodiment, optionally, the fan 11 is a centrifugal fan 11, the air inlet end 16 is directed towards the air outlet end 17, the diversion inclined plane 15 extends towards the direction close to the blade 13 of the fan 11, the blades 13 of the centrifugal fan 11 are annularly arrayed around the motor thereof, the airflow enters the wheel cavity formed by the blades 13 through the air inlet of the fan 11, and when the blades 13 rotate, the airflow enters the volute 12 of the fan 11 through the blades 13 and is output to the outside of the fan 11 through the output port of the volute 12.

Because the guide inclined plane 15 inclines towards the blade 13 area, airflow can flow towards the blade 13 along the guide inclined plane 15, so that the blade 13 can act on more airflow, and the generation of turbulent flow of the airflow in the wheel cavity is reduced.

When the air current is followed the water conservancy diversion inclined plane 15 flows, because the water conservancy diversion inclined plane 15 can with the air current to blade 13 is close to motor one end water conservancy diversion makes blade 13 is kept away from the gap of motor one end is difficult to produce gas leakage, and then can help improving centrifugal fan 11's availability factor.

The utility model provides an embodiment of lampblack absorber 10 on the basis of above-mentioned fan 11.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a range hood according to an embodiment of the present invention, the range hood 10 is provided with the fan 11 described in the above embodiment, and the mesh enclosure 20 can play a certain role of blocking oil drops to reduce the amount of oil drops discharged from the range hood 10. The range hood 10 further includes other functional components, which can refer to the prior art and are not described in detail.

Under the effect of screen panel 20, the air inlet vortex district 26 that fan 11 produced reduces, and then makes the noise that it can produce also reduce relatively, helps reducing the whole noise of lampblack absorber 10, simultaneously, helps increasing its smoking volume.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a screen panel, its characterized in that, screen panel one side is the air inlet side, and the opposite side is the air-out side, the screen panel includes:

an outer frame body;

2. The mesh enclosure of claim 1, wherein the width of the grid gradually narrows and smoothly transitions from the inlet side to the outlet side.

3. The screen of claim 1, wherein the ends of the grills adjacent to the air inlet side are curved surfaces; and/or the presence of a gas in the gas,

4. The mesh enclosure of claim 1 wherein the width of the grill adjacent the air outlet side is H2, wherein H2 is not less than 0.5mm and H2 is not greater than 1.5 mm.

5. The mesh enclosure of claim 1, wherein the direction of extension of the grills is inclined from the air inlet side to the air outlet side with respect to the axial direction of the mesh enclosure.

6. The mesh enclosure of claim 5, wherein the grid bars are arranged along the circumference of the mesh enclosure, and radial ribs are provided on the inner side of the outer frame body, and adjacent grid bars are connected by the radial ribs.

7. The mesh enclosure of claim 6, wherein the radial ribs divide the grill into at least two airflow passing areas, and adjacent airflow passing areas have unequal included angles between the extending direction of the grill and the axial direction of the mesh enclosure.

8. The mesh enclosure of any one of claims 1-7, wherein the width-wise sides of the grill are at an angle β with the axial direction of the mesh enclosure from the inlet side to the outlet side, and wherein β is not greater than 45 °.

9. A fan, characterized in that the air inlet of the fan is provided with a mesh enclosure according to any one of claims 1 to 8.

10. The fan according to claim 9, wherein a wind guide ring is disposed at the wind inlet of the fan, one end of the wind guide ring is a wind inlet end, the other end of the wind guide ring is a wind outlet end, and the wind outlet end is provided with a flow guide slope.

11. The fan of claim 10, wherein the fan is a centrifugal fan, the air inlet end of the fan faces the air outlet end of the fan, and the flow guide slope extends towards the impeller of the fan.

12. A range hood, characterized in that it is provided with a fan according to any one of claims 9-11.