CN220038566U

CN220038566U - Fume exhaust fan

Info

Publication number: CN220038566U
Application number: CN202320725207.XU
Authority: CN
Inventors: 杜志敏; 胡承杰
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-11-17
Anticipated expiration: 2033-03-30

Abstract

The utility model relates to a range hood, comprising: the fan frame is internally provided with a fan system; the exhaust fume collecting hood is connected with the fan frame, the bottom of the exhaust fume collecting hood is provided with an air inlet for external exhaust fume to enter, and an oil net with ventilation holes distributed on the air inlet is arranged at the air inlet; the oil screen comprises a first area and a second area which are sequentially arranged in the left-right direction, wherein the second area is arranged close to the central position of the fume collecting hood in the left-right direction relative to the first area, and the total open pore area of the first area of the oil screen is larger than that of the second area. The advantages are that: the ineffective air inlet of the oil screen in the central area of the bottom of the fume collecting hood is reduced, so that better flow distribution of fume is realized in the left-right direction, the area of the fume opening on the front side of the fume collecting hood is increased, fume collection is facilitated, fume dissipation is reduced, fume face-catching is reduced, and user experience is improved.

Description

Fume exhaust fan

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a range hood.

Background

A range hood is a kitchen appliance that purifies the kitchen environment. The range hood generally comprises a near-suction type range hood and a top-suction type range hood, wherein the top-suction type range hood has wider application due to the advantages of neatness, light weight, small occupied space and the like. The top-suction type range hood generally comprises a fume collecting hood and a fan frame positioned above the fume collecting hood, wherein a fan system is installed in the fan frame, and the fan system is generally a centrifugal fan.

The fume collecting hood of traditional top-draft fume extractor has one fume collecting cavity with air inlet in the top wall and fume filtering net in the air inlet. And a rectifying plate for rectifying the oil smoke is arranged below the air inlet so as to improve the oil smoke absorbing effect. Such a top-suction extractor hood is disclosed in chinese patent application publication No. CN201320774041.7 (grant notice No. CN 203628763U). However, because the air inlet is positioned in the middle area of the fume collecting hood, and the two burner heads on the cooking bench are positioned at the left and right sides, that is, are not opposite to the air inlet in the up-down direction, in the process of rising a large amount of fume, the fume still escapes from the left and right sides of the fume collecting hood.

Therefore, a double-cavity range hood is currently appeared, namely, a top-draft range hood has two left and right smoke collecting cavities at the bottom of a smoke collecting hood, for example, chinese patent application with the application number of CN202121464048.X (authorized notice number: CN 215001803U) discloses a double-cavity double-net range hood, which comprises a smoke collecting hood and a box coaming, wherein the bottom of the smoke collecting hood is provided with two smoke collecting cavities which are sequentially arranged left and right, each smoke collecting cavity is provided with an air inlet, an inner side oil guide component and an outer side oil guide component (namely an oil net) are arranged at the air inlet, the upper end of the inner side oil guide component is connected with the lower end of the side surface of the box coaming, and the lower end of the inner side oil guide component is connected with the middle part of the smoke collecting hood; the upper end of the outer oil guide component is propped against the lower end of the side surface of the box coaming, and the lower end of the outer oil guide component is connected with the fume collecting hood; the inner oil guide assembly is obliquely arranged towards the middle of the fume collecting hood, the outer oil guide assembly is in an inverted cone shape, and oil in the fume collecting hood flows along the oblique directions of the inner oil guide assembly and the outer oil guide assembly.

However, the above-mentioned dual-cavity range hood still has certain not enough, at first, in order to make things convenient for the user to use two jambs simultaneously and cook and have sufficient operating space, two jambs on the top of a kitchen range have certain distance, and dual-cavity range hood is because the restriction of lateral dimension, the distance between the central point of its two air intakes is relative (the distance between two jambs) less, and when the oil smoke is produced, the flue gas gathers in the position directly over the jamb more, the air current that the air intake was inhaled in the farther region of position directly over the air intake skew jamb is basically air, for invalid air inlet, this seriously influences the range hood's oil smoke absorbing effect. Secondly, mesh holes on the mesh plate at the air inlet of the fume collecting cover of the double-cavity type range hood are uniformly arranged, namely the ventilation area on the mesh plate is basically consistent in the front-back direction, the back side of the range hood body is basically wall-mounted, smoke can accumulate at the front side of the bottom of the body when rising greatly, and if the accumulated smoke cannot be timely sucked and exhausted, the accumulated smoke can easily escape at the front side of the fume collecting cover, so that the traditional double-cavity type range hood cannot perform better flow distribution in the front-back direction, and the fume absorbing effect is affected to a certain extent. Finally, the inner side oil guide assembly and the outer side oil guide assembly of the double-cavity range hood only guide oil stains gathered on the coaming of the solving box body, but the problem of dripping the oil stains gathered on the bottom wall of the fan system (mainly the volute) inside the box body is not considered, and because the two air inlets of the fume collecting hood are relatively close to each other, the oil gathered on the volute of the fan system can drip onto the cooking bench through the air inlets (or meshes of the screen at the air inlets), so that the user experience is affected.

Therefore, the existing range hood needs further improvement.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide the range hood capable of better distributing flow of oil smoke in the left-right direction and reducing ineffective air intake aiming at the current state of the art.

The second technical problem to be solved by the utility model is to provide the range hood capable of better flow distribution of the oil smoke in the front-back direction, increasing the smoke gathering effect, increasing the effective air inlet amount and reducing the overflow of the smoke aiming at the current state of the art.

The third technical problem to be solved by the utility model is to provide the range hood capable of preventing oil collected on the fan system from dripping on the cooking bench through the air inlet aiming at the current state of the art.

The utility model solves the first technical problem by adopting the technical scheme that:

a range hood, comprising:

the fan frame is internally provided with a fan system;

the exhaust fume collecting hood is connected with the fan frame, the bottom of the exhaust fume collecting hood is provided with an air inlet for external exhaust fume to enter, and an oil net with ventilation holes distributed on the air inlet is arranged at the air inlet;

the oil screen comprises a first area and a second area which are sequentially arranged in the left-right direction, wherein the second area is arranged close to the central position of the fume collecting hood in the left-right direction relative to the first area, and the total open pore area of the first area of the oil screen is larger than that of the second area.

As an improvement, the total open area of the oil screen is A, and the total area of the oil screen is A0, wherein 1/2 < A/A0 < 2/3. The proportion of the total open area on the oil screen is set in the range, the negative pressure at the vent hole of the oil screen is effectively improved on the basis of reducing the ineffective air inlet area, the oil smoke can be sucked and discharged as quickly as possible, and the oil smoke suction efficiency of the range hood is improved.

In order to further optimize the distribution of the air inlet flow rate of the left and right different areas of the oil screen, the ratio of the total open area of the first area of the oil screen to the total area of the first area is a1, 65% < a1 < 95%, the ratio of the total open area of the second area of the oil screen to the total area of the second area is a2, 0.ltoreq.a2 < 20%, and the total area of the first area and the total area of the second area on each oil screen are basically the same.

In order to further solve the second technical problem and the third technical problem, the second area of the oil screen includes a first ventilation area located at the front side of the oil screen and distributed with ventilation holes, and a first diversion area located at the rear side of the oil screen and integrally formed as a closed plate body.

The arrangement of the first diversion area of the oil net can not only correspondingly receive oil liquid dripped on the fan system, but also isolate noise generated in the operation process of the fan system to a certain extent, reduce the noise from being transmitted outwards through the air inlet and improve the sound quality of the range hood.

The stove head on the top of a kitchen range is generally provided with two left and right sides, in order to with two left and right sides furnace head looks adaptations, the bottom of collection petticoat pipe has first air intake and the second air intake that sets gradually along left and right directions, the oil net has two, is respectively for locating first oil net and the second oil net of locating second air intake department of first air intake department, the first region of first oil net is kept away from each other in left and right directions with the first region of second oil net, the second region of first oil net is close to each other in left and right directions with the second region of second oil net.

In order to further reduce the oil smoke escape problem, the bottom of the fume collecting hood is provided with a first fume collecting cavity and a second fume collecting cavity which are sequentially arranged along the left-right direction and are concave upwards, the first air inlet is formed in the top wall of the first fume collecting cavity, and the second air inlet is formed in the top wall of the second fume collecting cavity. The upward concave smoke collecting cavity plays a role in buffering oil smoke, and the oil smoke is not easy to escape when rising greatly.

In general, in order to collect the oil accumulated on the oil screen, the oil cup may be a strip-shaped cup body disposed at the rear side of the bottom of the fume collecting hood, such as extending along the left-right direction, and correspondingly, the oil screen may be inclined downward from front to back on the whole, but in order to enable the oil on the oil screen to rapidly flow into the oil cup, the oil cup further includes an oil cup disposed at the bottom of the fume collecting hood and between the first fume collecting cavity and the second fume collecting cavity, the oil cup is integrally strip-shaped and extends along the front-rear direction, the first oil screen is disposed at the left side of the bottom of the fume collecting hood, at least a second area of the first oil screen is inclined downward from left to right, a right side edge of the first oil screen is disposed above the oil cup, and an orthographic projection on a horizontal plane falls into the oil cup, and at least a second area of the second oil screen is inclined downward from right to left and left, and a left side edge of the second oil screen is disposed above the fume collecting hood, and at the right side of the second oil screen is inclined downward from right and left and the left side of the second area.

Under the general condition, the oil net can be set to local crooked or the net body structure of buckling according to actual need, but in order to simplify oil net structure and make things convenient for fluid water conservancy diversion to consider, first oil net wholly is dull and stereotyped form, and from left to right slope down, second oil net wholly is dull and stereotyped form also, and from right to left slope down.

In order to realize rapid fume suction and discharge, the first fume collecting cavity is provided with a first side wall and a second side wall which are opposite in the left-right direction, the first side wall of the first fume collecting cavity is inclined leftwards from top to bottom, the second side wall is inclined rightwards from top to bottom, and the first air inlet is formed in the second side wall of the first fume collecting cavity;

the second smoke collecting cavity is provided with a third side wall and a fourth side wall which are opposite in the left-right direction, the third side wall of the second smoke collecting cavity is inclined leftwards from top to bottom, the fourth side wall is inclined rightwards from top to bottom, and the second air inlet is formed in the third side wall of the second smoke collecting cavity.

The design of the smoke collecting cavity and the air inlet enables the air inlet on the smoke collecting cavity to basically face the burner on the cooking bench, so that the oil smoke can quickly reach the corresponding air inlet without being sucked and exhausted in the rising process.

In order to facilitate the processing and forming of the oil screen, the first diversion area on the oil screen is of a plate body structure integrally formed on the oil screen.

Besides the integral design, the oil screen can be realized by adopting an additional baffle component to shield the conventional oil screen, and specifically, the oil screen comprises an oil screen body with vent holes distributed and a baffle detachably connected to the oil screen body, and the baffle shields part of the vent holes on the oil screen body, so that the first diversion area is formed.

In order to ensure the flow guiding effect of the baffle plate on the oil screen on the oil fume, the baffle plate is positioned on one side of the oil screen body facing the outer part of the fume collecting hood.

In general, the baffle can be installed on the corresponding oil net body through modes such as screw connection, in order to make things convenient for the installation dismantlement of baffle, the baffle is in through the mode of magnetism suction connection correspondingly connect on the oil net body.

In order to prevent oil liquid on the inner side of the oil net from dripping downwards from the vent holes and to facilitate smooth diversion of the oil liquid into the oil cup, each vent hole of the oil net is a strip-shaped hole extending along the left-right direction, and the outer periphery edge of each vent hole is inwards bent and extended to form a baffle edge for blocking oil.

The utility model solves the second technical problem by adopting the technical proposal that:

a range hood, comprising:

the fan frame is internally provided with a fan system;

the oil screen comprises a third area on the front side and a fourth area on the rear side, wherein the total open area of the third area of the oil screen is larger than the total open area of the fourth area.

As an improvement, the total open area of the oil screen is A, and the total area of the oil screen is A0, wherein 1/2 < A/A0 < 2/3. The proportion of the total open area on the oil screen is set in the range, and on the basis of reducing the ineffective air inlet area, the negative pressure at the vent hole of the oil screen is further improved, so that the oil smoke can be sucked and discharged as quickly as possible, and the oil smoke suction efficiency of the range hood is improved.

In order to further optimize the distribution of the air inlet flow rate of different areas in front and behind the oil screen, the ratio of the total open area of the third area of the oil screen to the total area of the third area is a3, 55% < a3 < 85%, the ratio of the total open area of the fourth area of the oil screen to the total area of the fourth area is a4, 45.ltoreq.a2 < 55%, and the total area of the third area and the total area of the fourth area on each oil screen are basically the same

In order to realize reasonable flow distribution of the oil screen in the left-right direction, the oil screen comprises a second ventilation area which is far away from the bottom central area of the fume collecting hood in the left-right direction and is provided with ventilation holes, and a second diversion area which is adjacent to the bottom central area of the fume collecting hood in the left-right direction and is a closed plate body as a whole. The second ventilation area of the oil screen can extend to the left and right sides as far as possible through the structural design, so that the rising oil smoke of the cooking bench can rapidly pass through the oil screen to enter the range hood, and meanwhile, the second flow guiding area of the oil screen is adjacent to the bottom central area of the fume collecting hood, so that ineffective air inlet of the oil screen in the bottom central area (the area position deviating from the burner) of the fume collecting hood is reduced, and better flow distribution of the oil smoke in the left and right directions is realized.

The stove head on the top of a kitchen range is generally provided with a left stove head and a right stove head, in order to be matched with the left stove head and the right stove head, the bottom of the fume collecting hood is provided with a first air inlet and a second air inlet which are sequentially arranged along the left direction and the right direction, and the oil net is provided with two oil nets, namely a first oil net arranged at the first air inlet and a second oil net arranged at the second air inlet.

In general, in order to collect the oil accumulated on the oil screen, the oil cup may be a strip-shaped cup body disposed at the rear side of the bottom of the fume collecting hood, such as extending along the left-right direction, and correspondingly, the oil screen may be inclined downward from front to back on the whole, but in order to enable the oil on the oil screen to rapidly flow into the oil cup, the oil cup further includes an oil cup disposed at the bottom of the fume collecting hood and between the first fume collecting cavity and the second fume collecting cavity, the oil cup is integrally strip-shaped and extends along the front-rear direction, the first oil screen is disposed at the left side of the bottom of the fume collecting hood, at least a second flow guiding area of the first oil screen is inclined downward from left to right, a right side of the first oil screen is disposed above the oil cup, and an orthographic projection on a horizontal plane falls into the oil cup, and at least a second flow guiding area of the second oil screen is disposed at the right side of the bottom of the fume collecting hood, and the second oil screen is inclined downward from right to left side of the second oil screen.

In order to facilitate the processing and forming of the oil screen, the second diversion area on the oil screen is of a plate body structure integrally formed on the oil screen.

Besides the integral design, the oil screen can be realized by adopting an additional baffle component to shield the conventional oil screen, and particularly, the oil screen comprises an oil screen body with vent holes distributed and a baffle detachably connected to the oil screen body, and the baffle shields part of the vent holes on the oil screen body, so that the second diversion area is formed.

In general, each vent hole on the oil screen may have various open pore structures such as a bar-shaped hole, a circular hole, an elliptical hole, etc., so that in order to make the smoke enter the fume collecting hood through the vent hole in the third area more smoothly, the open pore area of each vent hole in the third area is larger than the open pore area of each vent hole in the fourth area. Of course, it is conceivable that the oil screen could also be designed as follows: the area of each vent hole of the third area is the same as the area of each vent hole of the fourth area, but the number of vent holes of the third area is larger than the number of vent holes of the fourth area, that is, the area of a 'ventilation area' formed by each vent hole on the third area is larger than the area of a 'ventilation area' formed by each vent hole on the fourth area.

The utility model solves the third technical problem by adopting the technical scheme that:

A range hood, comprising:

the fan system comprises a volute and an impeller arranged in the volute, and the axis of the impeller extends along the front-back direction;

the dimension of the volute in the left-right direction is denoted as L, a partial area of the volute taking the bottommost part as the center is denoted as an easy-oil-dropping area, and the dimension of the easy-oil-dropping area in the left-right direction is denoted as L1, wherein 1/4 is more than L1/L is less than 1/2;

the oil net comprises a third ventilation area with ventilation holes and an oil guiding area which is a closed plate body as a whole, and the left side edge and the right side edge of the vertical orthographic projection of the oil easy-falling area of the volute are positioned in the vertical orthographic projection range of the oil guiding area of the oil net.

In order to be matched with two furnace ends that set up about on the top of a kitchen range, the bottom of collection petticoat pipe has first air intake and the second air intake that sets gradually along left and right directions, the oil net has two, is respectively for locating first oil net and the second oil net of locating second air intake department of first air intake department, the third air passage of first oil net is kept away from each other in left and right directions with the third air passage of second oil net, the oil guide district of first oil net is close to each other in left and right directions with the oil guide district of second oil net.

As an improvement, the bottom of the fume collecting hood is provided with a first fume collecting cavity and a second fume collecting cavity which are sequentially arranged along the left-right direction and are concave upwards, the first air inlet is arranged on the top wall of the first fume collecting cavity, and the second air inlet is arranged on the top wall of the second fume collecting cavity. The upward concave smoke collecting cavity plays a role in buffering oil smoke, and the oil smoke is not easy to escape when rising greatly.

In order to be in can flowing to the oil cup fast on the oil screen, still including locating the bottom of collection petticoat pipe, and be located oil cup between first collection smoke chamber and the second collection smoke chamber, the oil cup is whole to be the strip, and extends along fore-and-aft direction, first oil screen is located the bottom left side of collection petticoat pipe, the oil guide area of this first oil screen is from left side to right downward sloping, the right side edge of this first oil screen is located the top of oil cup, and the orthographic projection on the horizontal plane falls into in the oil cup, the second oil screen is located the bottom right side of collection petticoat pipe, the oil guide area of this second oil screen is from right side to left downward sloping, the left side edge of this second oil screen is located the top of oil cup, and the orthographic projection on the horizontal plane falls into in the oil cup.

Besides the integral design, the oil screen can be realized by adopting an additional baffle component to shield the conventional oil screen, and the oil screen comprises an oil screen body with vent holes distributed and a baffle detachably connected to the oil screen body, and the baffle shields part of the vent holes on the oil screen body, so that the oil guiding area is formed.

In order to ensure that the oil smoke can be effectively sucked and discharged in the front side areas of the first oil net and the second oil net, the fan system comprises a volute, an air suction port is formed in the front side wall of the volute, and an air inlet channel for external smoke to enter the air suction port is formed between the front side wall of the volute and the front side plate of the fan frame. By the structural design, the air inlet duct is also positioned at the front part of the fan frame, namely, is as close to the front side areas (the ventilation areas are relatively larger) of the first oil net and the second oil net as possible, so that turning in the oil smoke flowing process is reduced, and smooth suction and discharge are realized.

Compared with the prior art, the utility model has the advantages that:

1. the oil net of the range hood is designed to be of an oil net structure with different ventilation areas in the left and right areas, so that the area with larger ventilation area (namely the first area of the oil net) on the oil net can extend to the left side or the right side of the fume collecting hood as much as possible, further, rising fume on the left side and the right side of the cooking bench can rapidly pass through the oil net to enter the range hood, meanwhile, as the ventilation area of the bottom central area (namely the second area) adjacent to the fume collecting hood is reduced, ineffective air inlet of the oil net in the bottom central area (the position of the area deviated from the burner) of the fume collecting hood is correspondingly reduced, negative pressure at the ventilation hole of the oil net is improved to a certain extent, fume can be sucked and exhausted as quickly as possible, fume suction efficiency of the range hood is improved, and better flow distribution of fume in the left and right directions is realized.

2. The range hood is designed to be of an oil net structure with a large front ventilation area relative to the rear side of the oil net, so that the oil fume can be timely sucked and discharged into the fume collecting hood when flowing to the front side of the bottom of the fume collecting hood, the situation that the oil fume escapes from the front side of the fume collecting hood due to incapability of being timely sucked and discharged in a large amount of rising process is avoided, good flow distribution of the oil fume in the front-rear direction is realized, and the use experience of a user is improved.

3. The arrangement of the oil guide area on the oil net of the range hood can correspondingly receive the oil dropped on the volute of the fan system, so that the oil smoke is prevented from dropping on the cooking bench through the vent holes corresponding to the oil net. On the other hand, the oil guiding area of the oil screen can also isolate noise generated in the running process of the fan system to a certain extent, so that the noise is reduced from being transmitted outwards through the air inlet, and the sound quality of the range hood is improved.

Drawings

Fig. 1 is a schematic perspective view of a range hood according to embodiment 1 of the present utility model;

fig. 2 is a top view of a range hood according to embodiment 1 of the present utility model;

fig. 3 is a vertical sectional view of the range hood of embodiment 1 of the present utility model taken in the left-right direction;

fig. 4 is a vertical sectional view of the range hood of embodiment 1 of the present utility model taken along the front-rear direction;

fig. 5 is a schematic perspective view of the front surface of the first oil screen according to embodiment 1 of the present utility model;

fig. 6 is a schematic perspective view of the back of the first oil screen according to embodiment 1 of the present utility model;

FIG. 7 is a front view of a first oil screen according to embodiment 1 of the present utility model;

FIG. 8 is a front view of a second oil screen according to embodiment 1 of the present utility model;

fig. 9 is a schematic perspective view of the back of the second oil screen according to embodiment 1 of the present utility model;

Fig. 10 is a schematic perspective view of a first oil screen according to embodiment 2 of the present utility model;

FIG. 11 is an exploded view of a first oil screen according to embodiment 2 of the present utility model;

fig. 12 is a schematic perspective view of a second oil screen according to embodiment 2 of the present utility model;

fig. 13 is an exploded view of a second oil screen according to embodiment 2 of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Example 1

Referring to fig. 1-9, a range hood includes a blower housing 10, a fume collection hood 30, a blower system 20, and an oil screen 40;50.

The fume collecting hood 30 is connected to the bottom of the fan frame 10 and communicates with the inner space of the fan frame 10. The lateral dimension (i.e., the dimension in the left-right direction) of the fume collecting hood 30 is greater than the lateral dimension of the fan frame 10, i.e., the fume collecting hood 30 has shoulders protruding to the left and right sides with respect to the fan frame 10 as a whole. A blower system 20 is provided in the blower housing 10 for providing a negative pressure for the extraction of cooking fumes. The fan system 20 typically employs a centrifugal fan that includes a volute 21, an impeller 22, and a motor (not shown) that drives the impeller 22. The impeller 22 is provided in the scroll 21, and its axis extends in the front-rear direction. The front side wall of the volute 21 is provided with an air suction port 210. An air inlet duct 23 for external flue gas to enter the air suction port 210 of the scroll case 21 is defined between the front side wall of the scroll case 21 and the front side plate of the fan housing 10.

Referring to fig. 3, the bottom of the fume collecting hood 30 has a first fume collecting cavity 31 and a second fume collecting cavity 32 arranged at left and right intervals, the first fume collecting cavity 31 is positioned at the left side, and the second fume collecting cavity 32 is positioned at the right side. The first smoke collecting chamber 31 and the second smoke collecting chamber 32 are both formed to be recessed upward. The top of the first smoke collecting cavity 31 is provided with a first air inlet 311, and a plane of the first air inlet 311 is inclined rightward from top to bottom. The top of the second smoke collecting cavity 32 is provided with a second air inlet 321, and the plane of the second air inlet 321 is inclined leftwards from top to bottom. The first air inlet 311 is provided with a first oil screen 40, and the second air inlet 321 is provided with a second oil screen 50. Specifically, the first smoke collecting chamber 31 has a first sidewall 312 and a second sidewall 313 opposite to each other in the left-right direction, wherein the first sidewall 312 of the first smoke collecting chamber 31 is inclined to the left from top to bottom, the second sidewall 313 is inclined to the right from top to bottom, the first air inlet 311 is opened on the second sidewall 313 of the first smoke collecting chamber 31, and of course, the first oil screen 40 is also disposed on the second sidewall 313 of the first smoke collecting chamber 31. The second smoke collecting chamber 32 has a third side wall 323 and a fourth side wall 324 opposite to each other in the left-right direction, the third side wall 323 of the second smoke collecting chamber 32 is inclined leftwards from top to bottom, the fourth side wall 324 is inclined rightwards from top to bottom, and the second air inlet 321 is formed in the third side wall 323 of the second smoke collecting chamber 32. The first air inlet 311 and the second air inlet 321 correspondingly arranged on the smoke collecting cavity can basically face the burner on the cooking bench, so that the smoke can quickly reach the corresponding air inlet 311 in the rising process; 321 without suction. More specifically, the first oil net 40 is distributed with first ventilation holes 411, and each of the first ventilation holes 411 is a strip-shaped hole and extends substantially along the left-right direction. The second oil net 50 is provided with second ventilation holes 511, and the second ventilation holes 511 are also bar-shaped holes and extend in a substantially horizontal direction.

Referring to fig. 7 and 8, the left and right side edges of the first oil screen 40 are respectively provided with a first buckle 48, and when in installation, the first buckles can be correspondingly inserted into the slots at the first air inlet 311, so that the first oil screen 40 is installed and fixed. Similarly, the second buckles 58 are respectively arranged at the left and right sides of the second oil screen 50, and can be correspondingly inserted into the slots at the second air inlet 321 during installation, so as to realize the installation and fixation of the second oil screen 50.

The first and second oil networks 40, 50 of the present embodiment are integrally formed in mirror symmetry. The total open areas of the vent holes on the first oil screen 40 and the second oil screen 50 are A, and the total areas of the first oil screen 40 and the second oil screen 50 are A0, wherein, 1/2 < A/A0 < 2/3. The first oil screen 40 and the second oil screen 50 each include a first region 41 distant from a bottom center region of the fume collecting hood 30 in the left-right direction; 51 and a second region 42 adjacent a bottom central region of the hood 30; 52. a first area 41 of the first oil screen 40 on the left; the total open area of the vent holes of 51 is greater than the second region 42;52, the total open area of the vents. A first region 41 of two oil networks; 51 and the first region 41;51 is a ratio of a1, 65% < a1 < 95%, preferably a1=80%, and the second areas 42 of the two oil networks; 52 and the second region 42;52 is a2, 0.ltoreq.a2 < 20%, preferably a2=10%. More specifically still, the second areas 42 of the two oil screens; 52 comprises a first ventilation zone 421 located on the front side of the oil network and distributed with ventilation holes; 521 and a first flow guiding region 422 located at the rear side of the oil screen and being a closed plate body (i.e. not capable of passing the air supply flow) as a whole; 522, i.e. the second areas 42 of the two oil networks; the vent areas on 52 are all located on the front side.

Two oil screens 40; first region 41 of 50; 51 and second region 42;52 may be delimited by a straight line or curve extending in the fore-and-aft direction on the web adjacent to its middle. In this embodiment, two oil screens 40; first region 41 of 50; 51 and the second region 42 in the left-right direction; 52 are substantially uniform in size in the left-right direction, i.e., each oil screen 40; a first region 41 on 50; 51 and the second region 42;52 are substantially the same.

The first oil screen 40 and the second oil screen 50 of the present embodiment are each integrally plate-shaped, and the first areas 41 of the two oil screens; 51 and a second region 42;52 lie substantially in the same plane. A second region 42 of two oil screens; a first flow directing region 422 on 52; 522 are solid plate structures integrally formed on the corresponding oil screen.

As shown in fig. 3, in order to adapt to the positions of the two burners on the cooking bench, to achieve better air distribution, the two burners on the cooking bench below the range hood, which are arranged at left and right intervals, are respectively denoted as a first burner 71 and a second burner 72, the first smoke collecting cavity 31 of the smoke collecting hood 30 is basically located right above the first burner 71, and the second smoke collecting cavity 32 is basically located right above the second burner 72.

The first areas 41 of the two oil screens of the present embodiment; 51 are distant from each other in the left-right direction, and the second region 42;52 are arranged adjacently, whereby the effective ventilation area of the first and second oil screens 40, 50 can extend as far as possible to the left and right, so that the rising cooking fumes can quickly pass through the oil screens into the range hood, while the second areas 42 of both oil screens; 52, a first flow directing region 422;522 are adjacently arranged, so that ineffective air intake of the two oil nets in the central area (the area position deviated from the burner head) at the bottom of the fume collecting hood 30 is reduced, and better flow distribution of the fume in the left-right direction is realized. On the other hand, the first diversion area 422 of the first oil screen 40 and the first diversion area 522 of the second oil screen 50 can correspondingly receive the oil dropped on the fan system 20, so as to prevent the oil smoke from dropping on the cooking bench through the ventilation holes of the corresponding oil screens.

Referring to fig. 3, an oil cup 33 is provided at the bottom of the fume collecting hood 30 at a position corresponding to the region between the first fume collecting chamber 31 and the second fume collecting chamber 32. The oil cup 33 is in a strip shape as a whole and extends in the front-rear direction. The right edge of the second region 42 of the first oil screen 40 is located above the oil cup 33 and the orthographic projection on the horizontal plane falls into the oil cup 33. The left edge of the second area 52 of the second oil screen 50 is located above the oil cup 33 and the orthographic projection on the horizontal plane falls into the oil cup 33. The outer peripheral edge of the first oil screen 40 is bent and extended towards the back of the first oil screen 40 to form a first oil baffle flange 470 for oil baffle, wherein the position of the part of the first oil baffle flange 470 corresponding to the right side, which is connected with the main body of the first oil screen 40, is sequentially provided with first oil leakage holes 47 for oil to drip along the front-back direction. The outer peripheral edge of the second oil screen 50 is bent and extended towards the back of the second oil screen 50 to form a second oil blocking flange 570 for blocking oil, wherein the second oil blocking flange 570 is sequentially provided with second oil leakage holes 57 for oil to drip along the front-back direction at the position where the right part of the second oil blocking flange 570 is correspondingly connected with the main body of the second oil screen 50.

Referring to fig. 6 and 9, the peripheral edge of each first ventilation hole 411 of the first oil screen 40 is bent and extended toward the back (i.e., the inside of the fume collecting hood 30) to form a first blocking edge 412, and likewise, the second ventilation area 491 of the second oil screen 50; the second blocking edges 512 which are bent and extended towards the back surface (namely, the inside of the fume collecting hood 30) are arranged on the outer peripheral edges of the second ventilation holes 511 of 591, and the arrangement of the first blocking edges 412 and the second blocking edges 512 plays a role in blocking oil, so that oil accumulated on the back surfaces of the first oil screen 40 and the second oil screen 50 cannot flow out from the corresponding ventilation holes.

Referring to fig. 2, 6 and 8, the first and second oil networks 40 and 50 each include a third region 43 at the front side; 53 and a fourth region 44 located on the rear side; 54, wherein the third region 43 of the oil network; 53 is greater than the fourth region 44; 54. Specifically, the third region 43 of each oil screen; 53 and the third region 43;53 is a ratio of a3, 55% < a3 < 85%, preferably a3=70%, per fourth area 44 of the oil network; 54 and the fourth region 44;54 is a4, 45.ltoreq.a2 < 55%, preferably a2=50%.

Two oil screens 40;50 is located in the third region 43; each vent in 53 and located in fourth region 44;54 are each strip-shaped holes extending from left to right, wherein the third region 43; the width of each vent hole in 53 and fourth region 44;54 are substantially uniform in width, and a third region 43; at least some of the vents 53 have a length greater than the fourth region 44;54, the length of each vent in the housing.

A third region 43 of the first and second oil networks 40, 50; 53 and the fourth region 44 in the front-rear direction; 54 are substantially uniform in size in the front-to-rear direction, i.e., each oil screen 40; a third region 43 on 50; 53 and the total area 44 of the fourth region; 54 are substantially identical. Because the open areas of the ventilation holes of the third area 43 of the first oil screen 40 located at the front side and the third area 53 of the second oil screen 50 located at the front side are relatively larger, the oil smoke can be timely sucked and discharged into the fume collecting hood 30 when flowing to the front side of the bottom of the fume collecting hood 30, the situation that the oil smoke cannot be timely sucked and discharged in a large amount of rising process and escapes from the front side of the fume collecting hood 30 is avoided, good flow distribution of the oil smoke in the front-rear direction is realized, and the use experience of a user is improved.

Both the oil nets include a second ventilation area 491 which is far away from the bottom central area of the fume collecting hood 30 in the left-right direction and is distributed with ventilation holes; 591 and a second flow guiding region 492 adjacent to the bottom center region of the fume collecting hood 30 in the left-right direction and being a closed plate body as a whole; 592. the rear side portion of the second ventilation area 491 of the first oil screen 40 is substantially uniform in size in the left-right direction, and the front side portion of the second ventilation area 491 of the first oil screen 40 is gradually increased in size from rear to front in the left-right direction. The rear side portion of the second ventilation area 591 of the second oil screen 50 is substantially uniform in size in the left-right direction, and the front side portion of the second ventilation area 591 of the second oil screen 50 is gradually increased in size from rear to front in the left-right direction. The structural design enables the second ventilation area 491 of the oil screen; 591 can extend to the left and right sides as much as possible, so that the cooking fume rising on the cooking bench can quickly pass through the oil screen to enter the range hood, and meanwhile, the second diversion area 492 of the oil screen; 592 is arranged near the bottom central region of the fume collecting hood 30, so that ineffective air intake of the oil screen in the bottom central region (the position of the region deviated from the burner head) of the fume collecting hood 30 is reduced, and better flow distribution of the fume in the left-right direction is realized.

Since the annular wall of the scroll casing 21 of the fan system 20 has an arc-shaped structure, in some cases, the oil collected on the annular wall of the scroll casing 21 does not have to drop at the lowest position of the annular wall of the scroll casing 21, that is, there is a possibility of dropping the oil in an area within a certain distance in the left-right direction on the annular wall of the scroll casing 21 with the lowest position as the center, and for this reason, the dimension of the scroll casing 21 of the fan system 20 in the left-right direction is denoted as L, wherein the partial area of the scroll casing 21 with the bottommost portion thereof as the center is denoted as an easy-to-drop oil area 211, and the dimension of the easy-to-drop oil area 211 in the left-right direction is denoted as L1,1/4 < L1/L < 1/2. The first oil screen 40 and the second oil screen 50 each include a third vent area 493 with vents distributed therein; 593 and an oil guiding area 494 which is an enclosed plate as a whole; 594, wherein the left side edge of the vertical orthographic projection of the oil-prone region 211 of the volute 21 is located at the oil guiding region 494 of the first oil screen 40; 594 is in the vertical orthographic projection range, and the right side edge of the vertical orthographic projection of the oil easy-to-drop region 211 of the scroll 21 is located at the oil guiding region 494 of the second oil screen 50; 594 is in vertical orthographic projection, thereby enabling oil guiding areas 494 of both oil screens; 594 can receive oil dripping from the annular wall of the volute 21 of the fan system 20 and is located at both oil nets 40; the oil is guided in the oil cup 33 between 50.

The third ventilation area 493 of the first oil screen 40 and the third ventilation area 593 of the second oil screen are distant from each other in the left-right direction, and the oil guiding area 494 of the first oil screen 40 and the oil guiding area 594 of the second oil screen are close to each other in the left-right direction. The third vent areas 493 of the two oil screens of this embodiment; 593, the second ventilation area 491 described above; 591, and two oil screens of oil guiding area 494;594, the second flow directing region 492 described above; 592.

the first smoke baffle 61 is arranged on the left side of the bottom of the smoke collecting hood 30, and the second smoke baffle 62 is arranged on the right side of the bottom. The first smoke baffle 61 is rotatably connected to the left side of the first smoke collecting chamber 31 with the left side thereof as a rotation axis (extending in the front-rear direction), and can open or close the bottom opening of the first smoke collecting chamber 31, and when the first smoke baffle 61 is opened, it is inclined leftward from top to bottom. The second smoke barrier 62 is rotatably connected to the right side of the second smoke collecting chamber 32 with the right side thereof as a rotation axis (extending in the front-rear direction), and can open or close the bottom opening of the second smoke collecting chamber 32, and is inclined rightward from top to bottom when the second smoke barrier 62 is opened. The first smoke baffle 61 and the second smoke baffle 62 are arranged, so that the smoke collecting area of the smoke collecting cover 30 is reduced, and the possibility of oil smoke escaping is reduced.

Example 2

Referring to fig. 10 to 13, this embodiment differs from embodiment 1 in that: the first oil screen 40 and the second oil screen 50 of the present embodiment form a corresponding second ventilation area 491;591 (third vent regions 493; 593) and second deflector region 492;592 The manner in which (oil transfer regions 494; 594) are formed is different. Specifically, the first oil screen 40 includes a first oil screen body 45 with ventilation holes distributed therein, and a first baffle 46 detachably connected to the first oil screen body 45. The first oil screen body 45 may adopt a conventional screen body structure with the first ventilation holes 411 distributed integrally, and the first baffle 46 shields part of the ventilation holes on the first oil screen body 45, so that the area of the first oil screen body 45 shielded by the first baffle 46 forms the second diversion area 492;592, and the portion of the first oil screen body 45 corresponding to the portion located outside the first baffle 46 (i.e. the area not covered by the first baffle 46) forms the second ventilation area 491;591. the first baffle 46 is disposed on one side of the first oil net body 45 facing the outer part of the fume collecting hood 30 in a magnetic connection manner, as shown in fig. 11, the edge portion of the first baffle 46 is provided with a first folded edge 461 bent inwards to form a U shape, the inner side of the first baffle 46 is provided with a first magnetic member 462, and when the first baffle 46 is mounted, the first folded edge 461 of the first baffle 46 is hung or wrapped at the side edge position of the first oil net body 45, and can be firmly mounted on the first oil net body 45 through the magnetic attraction of the first magnetic member 462.

Likewise, the second oil screen 50 includes a second oil screen body 56 with ventilation holes distributed therein and a second baffle 56 detachably connected to the second oil screen body 56. The second oil screen body 56 may adopt a conventional screen body structure with second ventilation holes 511 distributed integrally, and the second baffle 56 shields part of the ventilation holes on the second oil screen body 56, so that the area of the second oil screen body 56 shielded by the second baffle 56 forms a second diversion area 492 of the second oil screen 50; 592, and the portion of the second oil screen body 56 corresponding to the portion located outside the second baffle plate 56 (i.e. the area not covered by the second baffle plate 56) forms a second ventilation area 491 of the second oil screen 50; 591. the second baffle 56 is also arranged on one side of the second oil screen body 56 facing the outer part of the fume collecting hood 30 in a magnetic attraction connection mode, as shown in fig. 13, the edge part of the second baffle 56 is provided with a second folded edge 561 formed by inwards bending, and the second folded edge 561 is provided with an opening for the second buckle 58 correspondingly arranged at the side edge position of the first oil screen body 45 to pass through. The second magnetic member 562 is further disposed on the inner side of the second baffle 56, and when the second baffle is installed, the second flange 561 of the second baffle 56 is inserted and connected with the second buckle 58 correspondingly disposed at the side edge of the first oil screen body 45, and can be firmly installed on the second oil screen body 56 by the magnetic attraction of the second magnetic member 562.

Claims

1. A range hood, comprising:

a fan frame (10) having a fan system (20) disposed therein;

the exhaust fume collecting hood (30) is connected with the air blower frame (10), an air inlet (311; 321) for external exhaust fume to enter is formed in the bottom of the exhaust fume collecting hood (30), and an oil screen (40; 50) with ventilation holes distributed on the air inlet (311; 321) is arranged;

the method is characterized in that: the oil screen (40; 50) comprises a first area (41; 51) and a second area (42; 52) which are sequentially arranged in the left-right direction, wherein the second area (42; 52) is arranged close to the central position of the fume collecting hood (30) in the left-right direction relative to the first area (41; 51), and the total open area of the first area (41; 51) of the oil screen (40; 50) is larger than the total open area of the second area (42; 52).

2. The range hood of claim 1, wherein: the total open area on the oil screen (40; 50) is A, and the total area of the oil screen (40; 50) is A0, wherein 1/2 < A/A0 < 2/3.

3. The range hood of claim 2, wherein: the ratio of the total open area of the first areas (41; 51) of the oil screen (40; 50) to the total area of the first areas (41; 51) is a1, 65% < a1 < 95%, the ratio of the total open area of the second areas (42; 52) of the oil screen (40; 50) to the total area of the second areas (42; 52) is a2, 0.ltoreq.a2 < 20%, the total area of the first areas (41; 51) and the total area of the second areas (42; 52) on each of the oil screens (40; 50) being substantially the same.

4. A range hood according to claim 3, wherein: the second region (42; 52) of the oil screen (40; 50) comprises a first ventilation zone (421; 521) which is located on the front side of the oil screen (40; 50) and is distributed with ventilation holes, and a first diversion zone (422; 522) which is located on the rear side of the oil screen (40; 50) and is integrally a closed plate body.

5. A range hood according to claim 3, wherein: the bottom of the fume collecting hood (30) is provided with a first air inlet (311) and a second air inlet (321) which are sequentially arranged along the left-right direction, the two oil nets (40; 50) are respectively a first oil net (40) arranged at the first air inlet (311) and a second oil net (50) arranged at the second air inlet (321), a first area (41; 51) of the first oil net (40) and a first area (41; 51) of the second oil net are mutually far away in the left-right direction, and a second area (42; 52) of the first oil net (40) and a second area (42; 52) of the second oil net are mutually close in the left-right direction.

6. The range hood of claim 5, wherein: the bottom of collection petticoat pipe (30) has along controlling direction setting gradually, and all concave first collection cigarette chamber (31) and second collection cigarette chamber (32), first air intake (311) are located on the roof of first collection cigarette chamber (31), second air intake (321) are located on the roof of second collection cigarette chamber (32).

7. The range hood of claim 6, wherein: the oil cup (33) is arranged at the bottom of the fume collecting hood (30) and is positioned between the first fume collecting cavity (31) and the second fume collecting cavity (32), the oil cup (33) is integrally strip-shaped and extends along the front-back direction, the first oil net (40) is positioned at the left side of the bottom of the fume collecting hood (30), at least a second area (42; 52) of the first oil net (40) is inclined downwards from left to right, the right side edge of the first oil net (40) is positioned above the oil cup (33), and the orthographic projection on the horizontal plane falls into the oil cup (33), the second oil net (50) is positioned at the right side of the bottom of the fume collecting hood (30), at least a second area (42; 52) of the second oil net (50) is inclined downwards from right to left, the left side edge of the second oil net (50) is positioned above the oil cup (33), and the orthographic projection on the horizontal plane falls into the oil cup (33).

8. The range hood of claim 7, wherein: the first oil net (40) is integrally flat and inclined from left to right, and the second oil net (50) is integrally flat and inclined from right to left.

9. The range hood of claim 7, wherein: the first smoke collecting cavity (31) is provided with a first side wall (312) and a second side wall (313) which are opposite in the left-right direction, the first side wall (312) of the first smoke collecting cavity (31) is inclined leftwards from top to bottom, the second side wall (313) is inclined rightwards from top to bottom, and the first air inlet (311) is formed in the second side wall (313) of the first smoke collecting cavity (31);

The second smoke collecting cavity (32) is provided with a third side wall (323) and a fourth side wall (324) which are opposite in the left-right direction, the third side wall (323) of the second smoke collecting cavity (32) is inclined leftwards from top to bottom, the fourth side wall (324) is inclined rightwards from top to bottom, and the second air inlet (321) is formed in the third side wall (323) of the second smoke collecting cavity (32).

10. The range hood of claim 4, wherein: the first diversion area (422; 522) on the oil screen (40; 50) is a plate structure integrally formed on the oil screen (40; 50).

11. The range hood of claim 4, wherein: the oil screen (40; 50) comprises an oil screen body (45; 55) with vent holes distributed therein and a baffle plate (46; 56) detachably connected to the oil screen body (45; 55), wherein the baffle plate shields part of the vent holes on the oil screen body (45; 55) so as to form the first diversion area (422; 522).

12. The range hood of claim 11, wherein: the baffle (46; 56) is located on the side of the oil screen body (45; 55) facing the outside of the fume collecting hood (30).

13. The range hood of claim 11, wherein: the baffle plates (46; 56) are correspondingly connected to the oil screen body (45; 55) in a magnetic connection mode.

14. The range hood according to any one of claims 1 to 13, wherein: each of the ventilation holes of the oil screen (40; 50) is a strip-shaped hole extending in the left-right direction, and the outer periphery of each ventilation hole is bent inwards to form a baffle edge (412; 512) for blocking oil.

15. A range hood, comprising:

a fan frame (10) having a fan system (20) disposed therein;

the method is characterized in that: the oil screen (40; 50) comprises a third region (43; 53) on the front side and a fourth region (44; 54) on the rear side, the third region (43; 53) of the oil screen (40; 50) having a total open area which is greater than the total open area of the fourth region (44; 54).

16. The range hood of claim 15, wherein: the total open area on the oil screen (40; 50) is A, and the total area of the oil screen (40; 50) is A0, wherein 1/2 < A/A0 < 2/3.

17. The range hood of claim 16, wherein: the ratio of the total open area of the third areas (43; 53) of the oil screen (40; 50) to the total area of the third areas (43; 53) is a3, 55% < a3 < 85%, the ratio of the total open area of the fourth areas (44; 54) of the oil screen (40; 50) to the total area of the fourth areas (44; 54) is a4, 45.ltoreq.a2 < 55%, the total area of the third areas (43; 53) on each of the oil screens (40; 50) being substantially the same as the total area of the fourth areas (44; 54).

18. The range hood of claim 17, wherein: the oil screen (40; 50) includes a second ventilation area (491; 591) distant from the bottom central area of the fume collecting hood (30) in the left-right direction and distributed with ventilation holes, and a second diversion area (492; 592) adjacent to the bottom central area of the fume collecting hood (30) in the left-right direction and integrally formed as a closed plate body.

19. The range hood of claim 15, wherein: the bottom of the fume collecting hood (30) is provided with a first air inlet (311) and a second air inlet (321) which are sequentially arranged along the left-right direction, and the number of the oil nets (40; 50) is two, namely a first oil net (40) arranged at the first air inlet (311) and a second oil net (50) arranged at the second air inlet (321).

20. The range hood of claim 19, wherein: the bottom of collection petticoat pipe (30) has along controlling direction setting gradually, and all concave first collection cigarette chamber (31) and second collection cigarette chamber (32), first air intake (311) are located on the roof of first collection cigarette chamber (31), second air intake (321) are located on the roof of second collection cigarette chamber (32).

21. The range hood of claim 20, wherein: the oil cup (33) is arranged at the bottom of the fume collecting hood (30) and is positioned between the first fume collecting cavity (31) and the second fume collecting cavity (32), the oil cup (33) is integrally strip-shaped and extends along the front-back direction, the first oil net (40) is positioned at the left side of the bottom of the fume collecting hood (30), at least a second diversion area (492; 592) of the first oil net (40) is inclined downwards from left to right, the right side edge of the first oil net (40) is positioned above the oil cup (33), and the orthographic projection on the horizontal plane falls into the oil cup (33), the second oil net (50) is positioned at the right side of the bottom of the fume collecting hood (30), at least a second diversion area (492; 592) of the second oil net (50) is inclined downwards from right to left, the left side edge of the second oil net (50) is positioned above the oil cup (33), and the orthographic projection on the horizontal plane falls into the oil cup (33).

22. The range hood of claim 21 wherein: the first oil net (40) is integrally flat and inclined from left to right, and the second oil net (50) is integrally flat and inclined from right to left.

23. The range hood of claim 18, wherein: the second flow guiding region (492; 592) on the oil screen (40; 50) is a plate structure integrally formed on the oil screen (40; 50).

24. The range hood of claim 18, wherein: the oil screen (40; 50) comprises an oil screen body (45; 55) with vent holes distributed therein and a baffle plate (46; 56) detachably connected to the oil screen body (45; 55), wherein the baffle plate (46; 56) shields part of the vent holes on the oil screen body (45; 55) so as to form the second diversion area (492; 592).

25. The range hood of claim 24 wherein: the baffle (46; 56) is located on the side of the oil screen body (45; 55) facing the outside of the fume collecting hood (30).

26. The range hood of claim 25, wherein: the baffle plates (46; 56) are correspondingly connected to the oil screen body (45; 55) in a magnetic connection mode.

27. A range hood according to any one of claims 15 to 26, wherein: each of the ventilation holes of the oil screen (40; 50) is a strip-shaped hole extending in the left-right direction, and the outer periphery of each ventilation hole is bent inwards to form a baffle edge (412; 512) for blocking oil.

28. A range hood according to any one of claims 15 to 26, wherein: the open area of each of the ventilation holes in the third region (43; 53) is greater than the open area of each of the ventilation holes in the fourth region (44; 54).

29. A range hood, comprising:

a fan system (20) is arranged in the fan frame (10), the fan system (20) comprises a volute (21) and an impeller (22) arranged in the volute (21), and the axis of the impeller (22) extends along the front-back direction;

the fume collecting hood (30) is connected with the fan frame (10), an air inlet for external fume to enter is formed in the bottom of the fume collecting hood (30), and an oil net (40; 50) with ventilation holes distributed on the air inlet is arranged at the air inlet;

the method is characterized in that: the dimension of the volute (21) in the left-right direction is denoted as L, a partial area of the volute (21) taking the bottommost part as the center is denoted as an easy oil dropping area (211), and the dimension of the easy oil dropping area (211) in the left-right direction is denoted as L1, wherein 1/4 < L1/L < 1/2;

The oil screen (40; 50) comprises a third ventilation area (493; 593) with ventilation holes distributed and an oil guiding area (494; 594) which is an enclosed plate body as a whole, and the left side edge and the right side edge of the vertical orthographic projection of the oil easy-falling area (211) of the volute (21) are positioned in the vertical orthographic projection range of the oil guiding area (494; 594) of the oil screen (40; 50).

30. The range hood of claim 29, wherein: the bottom of the fume collecting hood (30) is provided with a first air inlet (311) and a second air inlet (321) which are sequentially arranged along the left-right direction, the number of the oil nets (40; 50) is two, namely a first oil net (40) arranged at the first air inlet (311) and a second oil net (50) arranged at the second air inlet (321), a third air-through area (493; 593) of the first oil net (40) and a third air-through area (493; 593) of the second oil net are mutually far away in the left-right direction, and an oil guiding area (494; 594) of the first oil net (40) and an oil guiding area (494; 594) of the second oil net are mutually close in the left-right direction.

31. The range hood of claim 30 wherein: the bottom of collection petticoat pipe (30) has along controlling direction setting gradually, and all concave first collection cigarette chamber (31) and second collection cigarette chamber (32), first air intake (311) are located on the roof of first collection cigarette chamber (31), second air intake (321) are located on the roof of second collection cigarette chamber (32).

32. The range hood of claim 31 wherein: the oil cup (33) is arranged at the bottom of the fume collecting hood (30) and between the first fume collecting cavity (31) and the second fume collecting cavity (32), the oil cup (33) is integrally strip-shaped and extends along the front-back direction, the first oil screen (40) is arranged at the left side of the bottom of the fume collecting hood (30), the oil guiding area (494; 594) of the first oil screen (40) is inclined downwards from left to right, the right side edge of the first oil screen (40) is arranged above the oil cup (33), the orthographic projection on the horizontal plane falls into the oil cup (33), the second oil screen (50) is arranged at the right side of the bottom of the fume collecting hood (30), the oil guiding area (494; 594) of the second oil screen (50) is inclined downwards from right to left, the left side edge of the second oil screen (50) is arranged above the oil cup (33), and the orthographic projection on the horizontal plane falls into the oil cup (33).

33. The range hood of claim 32 wherein: the first oil net (40) is integrally flat and inclined from left to right, and the second oil net (50) is integrally flat and inclined from right to left.

34. The range hood of claim 32 wherein: the first smoke collecting cavity (31) is provided with a first side wall (312) and a second side wall (313) which are opposite in the left-right direction, the first side wall (312) of the first smoke collecting cavity (31) is inclined leftwards from top to bottom, the second side wall (313) is inclined rightwards from top to bottom, and the first air inlet (311) is formed in the second side wall (313) of the first smoke collecting cavity (31);

35. The range hood according to any one of claims 29 to 34, wherein: the oil guiding area (494; 594) on the oil net (40; 50) is a plate structure integrally formed on the oil net (40; 50).

36. The range hood according to any one of claims 29 to 34, wherein: the oil screen (40; 50) comprises an oil screen body (45; 55) with vent holes distributed therein and a baffle plate (46; 56) detachably connected to the oil screen body (45; 55), wherein the baffle plate shields part of the vent holes on the oil screen body (45; 55) so as to form the oil guiding area (494; 594).

37. The range hood of claim 36 wherein: the baffle (46; 56) is located on the side of the oil screen body (45; 55) facing the outside of the fume collecting hood (30).

38. The range hood of claim 37 wherein: the baffle plates (46; 56) are correspondingly connected to the oil screen body (45; 55) in a magnetic connection mode.

39. The range hood according to any one of claims 29 to 34, wherein: each of the ventilation holes of the oil screen (40; 50) is a strip-shaped hole extending in the left-right direction, and the outer periphery of each ventilation hole is bent inwards to form a baffle edge (412; 512) for blocking oil.

40. The range hood according to any one of claims 29 to 34, wherein: the fan system (20) comprises a volute (21), an air suction inlet (210) is formed in the front side wall of the volute (21), and an air inlet channel (23) for external flue gas to enter the air suction inlet (210) is formed between the front side wall of the volute (21) and the front side plate of the fan frame (10).