Range hood

Abstract

The utility model relates to a range hood, which comprises a fan frame, a first exhaust inlet, a first smoke gathering cavity and a second smoke gathering cavity are formed in the bottom of the smoke collecting hood, the first exhaust inlet is formed in the inner wall of the first smoke gathering cavity, and a second exhaust inlet is formed in the inner wall of the second smoke gathering cavity; the left-right size of the vertical section, sectioned in the left-right direction, of the first smoke gathering cavity is gradually reduced from bottom to top, the first air suction opening is located in the top of the first smoke gathering cavity or arranged close to the top of the first smoke gathering cavity, and the position where the first air suction opening is located is closer to the left side edge of the first smoke gathering cavity in the left-right direction. The left-right size of the vertical section, sectioned in the left-right direction, of the second smoke gathering cavity is gradually reduced from bottom to top, the second air suction opening is located in the top of the second smoke gathering cavity or arranged close to the top of the second smoke gathering cavity, and the position where the second air suction opening is located is closer to the right side edge of the second smoke gathering cavity in the left-right direction. The range hood has the advantage that the problem that lampblack escapes from the left side and the right side can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to kitchen appliance technical field especially, relate to a kind of range hood. BACKGROUND

[0002] Range hood is a kind of kitchen appliance that purifies kitchen environment.Range hood is generally divided into top suction type range hood and near suction type range hood.But the existing top suction type range hood generally only has a bottom middle air inlet, and its smoke suction effect is poor, and oil fume is easy to escape from side.

[0003] Therefore, the Chinese utility model patent application with application number CN202221358667.5 (authorized announcement number: CN217928918U) discloses a T-shaped smoke machine, which comprises a smoke collecting hood and an air exhaust shell. The bottom of the smoke collecting hood is provided with a main smoke collecting structure and an auxiliary smoke collecting structure. The main smoke collecting structure is used to define a concave main smoke collecting cavity. The auxiliary smoke collecting structure is used to define a concave auxiliary smoke collecting cavity. Specifically, the cross section of the auxiliary smoke collecting cavity is wedge-shaped. The cross-sectional area of the auxiliary smoke collecting cavity gradually increases from one end away from the main smoke collecting structure to one end close to the main smoke collecting structure. In addition, an auxiliary smoke suction port group is arranged on the inner side wall of the one end of the auxiliary smoke collecting cavity close to the main smoke collecting structure.

[0004] However, the range hood in the above patent application still has some deficiencies. The cross section of the auxiliary smoke collecting cavity in the above application is wedge-shaped. The cross-sectional area of the auxiliary smoke collecting cavity gradually increases from one end away from the main smoke collecting structure to one end close to the main smoke collecting structure. In addition, the auxiliary smoke suction port group is arranged on the inner side wall of the one end of the auxiliary smoke collecting cavity close to the main smoke collecting structure. Since the auxiliary smoke suction port is adjacent to the main smoke collecting cavity, when a large amount of oil fume rises, the above structure design causes the oil fume diffused to the left and right sides, especially the oil fume diffused to the edge positions of the left and right sides, to be too far away from the auxiliary smoke suction port and thus cannot be effectively captured. Therefore, the problem of oil fume escaping from the left and right sides cannot be effectively improved.

[0005] Therefore, the existing range hood needs to be further improved. UTILITY MODEL CONTENTS

[0006] The utility model solves the technical problem to be solved, and provides a range hood which can effectively improve the problem of oil fume escaping from the left and right sides.

[0007] The utility model solves the above technical problem by adopting the following technical scheme. A range hood comprises:

[0008] A fan frame;

[0009] The smoke hood is located below the fan frame, and the bottom of the smoke hood is provided with a main air inlet, a first smoke collection cavity located on the left side of the main air inlet, and a second smoke collection cavity located on the right side of the main air inlet. The inner wall of the first smoke collection cavity is provided with a first air inlet, and the inner wall of the second smoke collection cavity is provided with a second air inlet.

[0010] The first smoke collection cavity extends in the front-rear direction, and the left-right dimension of the vertical section cut along the left-right direction gradually decreases from bottom to top. The first air inlet is located at or adjacent to the top of the first smoke collection cavity, and the position of the first air inlet is closer to the left edge of the first smoke collection cavity in the left-right direction. The second smoke collection cavity extends in the front-rear direction, and the left-right dimension of the vertical section cut along the left-right direction gradually decreases from bottom to top. The second air inlet is located at or adjacent to the top of the second smoke collection cavity, and the position of the second air inlet is closer to the right edge of the second smoke collection cavity in the left-right direction.

[0011] The above-mentioned "the position of the first air inlet is closer to the left edge of the first smoke collection cavity in the left-right direction" can be understood as: the distance (horizontal distance in the left-right direction) from the position of the first air inlet to the left edge of the first smoke collection cavity is less than the distance (horizontal distance in the left-right direction) from the position of the first air inlet to the right edge of the first smoke collection cavity. The same applies to the position of the second air inlet.

[0012] Because the left-right dimension of the vertical section of the first smoke collection cavity and the second smoke collection cavity gradually decreases from bottom to top in the left-right direction, and the first air inlet of the first smoke collection cavity and the second air inlet of the second smoke collection cavity are both located at the top, when a large amount of oil smoke rises, the oil smoke that cannot be exhausted by the main air inlet and spreads to the left and right sides will climb along the inclined wall surface of the corresponding smoke collection cavity under the action of the wall effect. Because the positions of the first air inlet and the second air inlet are closer to the left edge of the first smoke collection cavity and the right edge of the second smoke collection cavity in the left-right direction, respectively, even if the oil smoke further spreads to the left or right, it can still be effectively captured and sucked into the corresponding first air inlet and second air inlet, reducing the escape of oil smoke to the left and right sides and providing a better user experience.

[0013] In general, the vertical section of the first smoke collection cavity and the second smoke collection cavity cut along the left-right direction can be a triangular shape with the top smaller than the bottom, a trapezoidal shape, or other similar triangular or trapezoidal shapes. Preferably, in order to reduce the processing difficulty and ensure the flow guiding effect, the vertical section of the first smoke collection cavity cut along the left-right direction is a triangular shape with the top smaller than the bottom, and the vertical section of the second smoke collection cavity cut along the left-right direction is a triangular shape with the top smaller than the bottom.

[0014] As an improvement, the bottom wall of the smoke hood comprises a first flow guide wall inclined rightward from top to bottom and a second flow guide wall inclined leftward from top to bottom in the region corresponding to the first smoke collection cavity, and the top of the first flow guide wall is connected with the top of the second flow guide wall;

[0015] The bottom wall of the smoke hood comprises a third flow guide wall inclined leftward from top to bottom and a fourth flow guide wall inclined rightward from top to bottom in the region corresponding to the second smoke collection cavity, and the top of the third flow guide wall is connected with the top of the fourth flow guide wall.

[0016] In order to make the first and second air inlets as close as possible to the left and right side edges of the smoke hood and ensure the flow guide effect, the inclination angle of the first flow guide wall relative to the vertical direction is greater than the inclination angle of the second flow guide wall relative to the vertical direction, and the inclination angle of the third flow guide wall relative to the vertical direction is greater than the inclination angle of the fourth flow guide wall relative to the vertical direction.

[0017] The first air inlet is provided at the top of the second flow guide wall and is a strip-shaped opening extending in the front-rear direction, and the second air inlet is provided at the top of the fourth flow guide wall and is a strip-shaped opening extending in the front-rear direction.

[0018] In order to improve the oil fume suction effect, the smoke hood defines a first air duct communicating the first air inlet with the internal space of the fan frame and a second air duct communicating the second air inlet with the internal space of the fan frame, the upper and lower dimensions of the first air duct gradually increase from left to right, and the upper and lower dimensions of the second air duct gradually increase from right to left.

[0019] According to the fluid continuity equation Q=S*V, where Q is the air volume, S is the flow area, and V is the air speed, it can be known that S and V are inversely proportional, that is, under the condition that the flow Q remains unchanged, V gradually decreases from the inlet end to the outlet end as S gradually increases, that is, V is larger at the inlet end and smaller at the outlet end. Therefore, the gradual change structure design of the first and second air ducts makes V larger at the inlet end of the corresponding air duct, which helps the oil fumes diffused into the smoke collection cavities on both sides of the smoke hood to be quickly captured, improving the smoke suction effect, and the gradually increasing internal cross-sectional area of the air duct, that is, the gradually decreasing air speed, helps to reduce flow loss during flow.

[0020] In order to enable the smoke gas sucked in through the first and second air inlets to smoothly and quickly enter the corresponding first and second air ducts, a first revolving wall surface gradually curved from the first air inlet to the first air duct is formed on the region of the smoke hood opposite to the first air inlet, and a second revolving wall surface gradually curved from the second air inlet to the second air duct is formed on the region of the smoke hood opposite to the second air inlet.

[0021] In order to further improve the smoothness of the oil fume entering the corresponding air duct through the first air inlet and the second air inlet, the cross section of the first spiral wall is spiral, and the curvature radius gradually increases from the first air inlet to the first air duct; the cross section of the second spiral wall is spiral, and the curvature radius gradually increases from the second air inlet to the second air duct.

[0022] In order to effectively adapt to the unilateral cooking condition, the smoke suction effect of the first air inlet and the second air inlet on the left and right sides is adjusted according to actual needs, the first air duct has a first air outlet communicating with the internal space of the fan frame, the second air duct has a second air outlet communicating with the internal space of the fan frame, the first air outlet is provided with a first air inlet grille assembly capable of changing the ventilation air volume of the first air duct, and the second air outlet is provided with a second air inlet grille assembly capable of changing the ventilation air volume of the second air duct.

[0023] In order to simplify the structure of the above-mentioned air inlet grille assembly and reduce the cost, the first air inlet grille assembly comprises:

[0024] A first fixed grille, which is distributed with first air inlet holes;

[0025] A first movable grille, which is arranged on the upstream side or the downstream side of the first fixed grille, is distributed with second air inlet holes, and can be driven by a first driving mechanism to move relative to the first fixed grille along the extension direction of the first fixed grille, so as to change the overlapping area of the first air inlet holes on the first fixed grille and the second air inlet holes on the first movable grille;

[0026] The second air inlet grille assembly comprises:

[0027] A second fixed grille, which is distributed with third air inlet holes;

[0028] A second movable grille, which is arranged on the upstream side or the downstream side of the second fixed grille, is distributed with fourth air inlet holes, and can be driven by a second driving mechanism to move relative to the second fixed grille along the extension direction of the second fixed grille, so as to change the overlapping area of the third air inlet holes on the second fixed grille and the fourth air inlet holes on the second movable grille.

[0029] Compared with the prior art, the advantages of the utility model are: because the left-right size of the vertical section of the first smoke collecting cavity and the second smoke collecting cavity gradually decreases from bottom to top along the left-right direction, and the first air inlet of the first smoke collecting cavity and the second air inlet of the second smoke collecting cavity are arranged at the top, therefore, when a large amount of oil fume rises, the oil fume which cannot be sucked and discharged by the main air inlet and diffuses to the left and right sides can climb along the inclined wall surface of the corresponding smoke collecting cavity under the action of the wall attachment effect, because the arrangement positions of the first air inlet and the second air inlet are respectively closer to the left side edge of the first smoke collecting cavity and the right side edge of the second smoke collecting cavity in the left-right direction, even if the oil fume further diffuses to the left side or the right side, it can still be effectively captured and sucked into the corresponding first air inlet and second air inlet, reduces the escape problem of the oil fume at the left and right sides, and provides the use experience of the user. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment;

[0031] Figure 2 It is a transverse sectional view of the range hood of the utility model embodiment;

[0032] Figure 3 It is Figure 2 It is an enlarged view of the middle A;

[0033] Figure 4 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment after the partial side plate of the smoke collecting hood is removed;

[0034] Figure 5 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment after the partial side plate of the smoke collecting hood is removed;

[0035] Figure 6 It is a three-dimensional structure schematic view of the first air inlet grille assembly and the second air inlet grille assembly of the utility model embodiment and the corresponding drive mechanism (the first air inlet grille assembly and the second air inlet grille assembly are all in the partially open state);

[0036] Figure 7 It is a three-dimensional structure schematic view of the first air inlet grille assembly and the second air inlet grille assembly of the utility model embodiment and the corresponding drive mechanism (the first air inlet grille assembly is in the maximum open state, and the second air inlet grille assembly is in the closed state). DETAILED DESCRIPTION

[0037] The utility model will be described further in detail in combination with the drawings.

[0038] In the description and claims of the present application, terms are used to describe various example embodiments of the application. These terms are used only to facilitate description of the example embodiments of the application, and are in no way intended to limit or restrict the scope of the application. For example, the terms "front," "back," "upper," "lower," "left," "right," "side," "top," "bottom," "under," and the like are used only to denote the orientation of aspects of the example embodiments of the application as shown in the figures. The application can be in different orientations and configurations, and so these terms are in no way intended to limit or restrict the scope of the application.

[0039] Figures 1-7 A preferred embodiment of the range hood of the present application is shown. The range hood includes a fan frame 11, a smoke collecting hood 12, a centrifugal fan 13, a first air inlet grille assembly 20, a second air inlet grille assembly 30, a first driving mechanism, and a second driving mechanism.

[0040] The smoke collecting hood 12 is arranged at the bottom of the fan frame 11, and the inner cavity of the fan frame 11 is in communication with the inner cavity of the smoke collecting hood 12. The bottom of the smoke collecting hood 12 is provided with an air inlet, through which external smoke gas can enter the smoke collecting hood 12. The centrifugal fan 13 is arranged in the fan frame 11, and the centrifugal fan 13 generates negative pressure when operating, so that external oil fume can be sucked into the smoke collecting hood 12 through the air inlet. The air inlet of the smoke collecting hood 12 includes a main air inlet 120 located at the middle position and auxiliary air inlets located on the left and right sides of the main air inlet 120, and the auxiliary air inlets include a first air inlet 1201 located on the left side and a second air inlet 1202 located on the right side. The main air inlet 120 corresponds to the position directly below the fan frame 11, and an oil screen 124 is further arranged at the main air inlet 120 for filtering oil fume.

[0041] The left and right dimensions of the main body of the smoke hood 12 are greater than the left and right dimensions of the main body of the fan stand 11, wherein a first air duct 1211 is defined in the left portion of the smoke hood 12 (i.e., the shoulder portion protruding to the left relative to the main body of the fan stand 11), and a second air duct 1212 is defined in the right portion of the smoke hood 12 (i.e., the shoulder portion protruding to the right relative to the main body of the fan stand 11). The bottom of the smoke hood 12 also has two smoke collection cavities recessed upward on the left and right sides, respectively, which are a left first smoke collection cavity 1203 and a right second smoke collection cavity 1204. The first smoke collection cavity 1203 and the second smoke collection cavity 1204 are arranged in the front-rear direction. The left and right dimensions of the vertical cross section of the first smoke collection cavity 1203 and the second smoke collection cavity 1204 in the left-right direction are gradually reduced from bottom to top. In some embodiments, the cross section of the first smoke collection cavity 1203 and the second smoke collection cavity 1204 (vertical cross section in the left-right direction) is a triangular shape with the top smaller than the bottom. Of course, in other alternative embodiments, the vertical cross section of the first smoke collection cavity 1203 and the second smoke collection cavity 1204 in the left-right direction can also be a trapezoidal shape or other similar triangular or trapezoidal shape.

[0042] The top of the first smoke collection cavity 1203 (or the area adjacent to the top) is provided with a strip-shaped air inlet connected to the first air duct 1211, which extends in the front-rear direction, i.e., constitutes the first air inlet 1201. Similarly, the top of the second smoke collection cavity 1204 is provided with a strip-shaped air inlet connected to the second air duct 1212, which also extends in the front-rear direction, i.e., constitutes the second air inlet 1202. The first air inlet 1201 is located closer to the left edge of the first smoke collection cavity 1203 in the left-right direction, and the second air inlet 1202 is located closer to the right edge of the second smoke collection cavity 1204 in the left-right direction.

[0043] Since the left and right dimensions of the vertical cross section of the first smoke collection cavity 1203 and the second smoke collection cavity 1204 in the left-right direction are gradually reduced from bottom to top, and the first air inlet 1201 of the first smoke collection cavity 1203 and the second air inlet 1202 of the second smoke collection cavity 1204 are both located at the top, when a large amount of oil fume rises, the oil fume that cannot be sucked by the main air inlet 120 and spreads to the left and right sides will climb along the inclined wall of the corresponding smoke collection cavity under the effect of the wall attachment effect. Since the first air inlet 1201 and the second air inlet 1202 are located closer to the left edge of the first smoke collection cavity 1203 and the right edge of the second smoke collection cavity 1204 in the left-right direction, respectively, even if the oil fume further spreads to the left or right, it can still be effectively captured and sucked into the corresponding first air inlet 1201 and second air inlet 1202, reducing the escape of oil fume to the left and right sides and providing a better user experience.

[0044] Referring to Figure 2 , the bottom wall of the fume hood 12 comprises a first flow guide wall 1251 inclined downward to the right and a second flow guide wall 1252 inclined downward to the left in the region corresponding to the first fume guiding cavity 1203, the top of the first flow guide wall 1251 is connected to the top of the second flow guide wall 1252, the first air inlet 1201 is arranged at the top of the second flow guide wall 1252, the inclination angle a1 of the first flow guide wall 1251 relative to the vertical direction is greater than the inclination angle b1 of the second flow guide wall 1252 relative to the vertical direction. The bottom wall of the fume hood 12 comprises a third flow guide wall 1253 inclined downward to the left and a fourth flow guide wall 1254 inclined downward to the right in the region corresponding to the second fume guiding cavity 1204, the top of the third flow guide wall 1253 is connected to the top of the fourth flow guide wall 1254. The second air inlet 1202 is arranged at the top of the fourth flow guide wall 1254. The inclination angle a2 of the third flow guide wall 1253 relative to the vertical direction is greater than the inclination angle b2 of the fourth flow guide wall 1254 relative to the vertical direction.

[0045] As shown in Figure 2 , the first air duct 1211 and the second air duct 1212 extend substantially in the left-right direction, wherein the inlet (i.e. the left side port) of the first air duct 1211 communicates with the first air inlet 1201, the size (specifically the width in the up-down direction) of the first air duct 1211 gradually increases from left to right, and a first air outlet 1221 is formed at the position where the fume hood 12 connects to the fan frame 11. The first air duct 1211 can be defined by the corresponding part of the first flow guide wall 1251 and the top wall of the fume hood 12. The first air outlet 1221 is a strip-shaped port arranged in the front-back direction, and the first air inlet grille assembly 20 is correspondingly arranged at the first air outlet 1221. In order to enable the smoke sucked in through the first air inlet 1201 to smoothly and quickly enter the corresponding first air duct 1211, a first spiral wall surface 1261 is formed on the fume hood 12 in the region opposite to the first air inlet 1201, gradually bending from the first air inlet 1201 to the first air duct 1211. The cross section (i.e. the vertical cross section obtained by cutting in the left-right direction) of the first spiral wall surface 1261 is spiral, and the radius of curvature gradually increases from the first air inlet 1201 to the first air duct 1211. The inlet (i.e. the right side port) of the second air duct 1212 communicates with the second air inlet 1202, and the size (specifically the width in the up-down direction) of the second air duct 1212 gradually increases from left to right, and a second air outlet 1222 is formed at the position where the fume hood 12 connects to the fan frame 11. The second air outlet 1222 is a strip-shaped port arranged in the front-back direction, and the second air inlet grille assembly 20 is correspondingly arranged at the second air outlet 1222. In order to enable the smoke sucked in through the second air inlet 1202 to smoothly and quickly enter the corresponding second air duct 1212, a second spiral wall surface 1262 is formed on the fume hood 12 in the region opposite to the second air inlet 1202, gradually bending from the second air inlet 1202 to the second air duct 1212. The cross section (i.e. the vertical cross section obtained by cutting in the left-right direction) of the second spiral wall surface 1262 is spiral, and the radius of curvature gradually increases from the second air inlet 1202 to the second air duct 1212. Figure 3h) gradually increases from right to left, and forms a second air outlet 1222 at the position where the fume hood 12 meets the fan stand 11. The second air duct 1212 can be defined by the third flow guide wall 1253 mentioned above and the corresponding part of the top wall of the fume hood 12. The second air outlet 1222 is a strip-shaped opening arranged in the front-rear direction, and the second air inlet grille assembly 30 is correspondingly arranged at the second air outlet 1222. In order to enable the smoke sucked in through the second air inlet 1202 to smoothly and quickly enter the corresponding second air duct 1212, the area of the fume hood 12 opposite to the second air inlet 1202 is configured with a second spiral wall surface 1262 that gradually curves from the second air inlet 1202 to the second air duct 1212. The cross section (i.e. the vertical section along the left-right direction) of the second spiral wall surface 1262 is spiral-shaped, and the radius of curvature gradually increases from the second air inlet 1202 to the second air duct 1212.

[0046] According to the fluid continuity equation Q = S * V, where Q is the air volume, S is the flow area, and V is the air speed, it can be known that S and V are inversely proportional, that is, under the condition that the flow Q remains unchanged, V gradually decreases from the inlet end to the outlet end as S gradually increases, that is, V is larger at the inlet end and smaller at the outlet end. Therefore, the gradual change structure design of the first air duct 1211 and the second air duct 1212 makes V larger at the inlet end of the corresponding air duct, which helps the oil fume diffused to the smoke collection cavities on both sides of the fume hood 12 to be quickly captured, improving the smoking effect, and the gradually increasing cross-sectional area inside the air duct, i.e. the decreasing air speed, helps to reduce flow loss during flow.

[0047] The first air inlet grille assembly 20 includes a first fixed grille 21 and a first movable grille 22. The first fixed grille 21 and the first movable grille 22 are both arranged in the front-rear direction and are attached to each other. As shown in FIG. 1, the first fixed grille 21 is arranged on the front side of the fume hood 12, and the first movable grille 22 is arranged on the rear side of the fume hood 12. Figure 4As shown, the first movable grille 22 is arranged on the upstream side of the first fixed grille 21 (i.e. the side away from the main body of the fan stand 11). The first fixed grille 21 is provided with first air inlet holes 210, each of which is arranged in sequence and at intervals in the front-rear direction, and each of which is a vertically extending strip-shaped hole. Correspondingly, the first movable grille 22 is provided with second air inlet holes 220, each of which is also arranged in sequence and at intervals in the front-rear direction, and each of which is also a vertically extending (i.e. perpendicular to the moving direction of the first movable grille 22) strip-shaped hole. The above-mentioned first movable grille 22 can be driven by the first driving mechanism to move relative to the first fixed grille 21 along the extension direction (specifically the front-rear direction) of the first fixed grille 21, so as to change the overlapping area of the first air inlet holes 210 on the first fixed grille 21 and the second air inlet holes 220 on the first movable grille 22, i.e. to change the air volume of the first air duct 1211. The second air inlet grille assembly 30 includes a second fixed grille 31 and a second movable grille 32. The second fixed grille 31 and the second movable grille 32 are arranged in the front-rear direction and are attached to each other. Figure 5 As shown, the second movable grille 32 is arranged on the upstream side of the second fixed grille 31 (i.e. the side away from the main body of the fan stand 11). The second fixed grille 31 is provided with third air inlet holes 310, each of which is arranged in sequence and at intervals in the front-rear direction, and each of which is a vertically extending strip-shaped hole. Correspondingly, the second movable grille 32 is provided with fourth air inlet holes 320, each of which is also arranged in sequence and at intervals in the front-rear direction, and each of which is also a vertically extending (i.e. perpendicular to the moving direction of the second movable grille 32) strip-shaped hole. The above-mentioned second movable grille 32 can be driven by the second driving mechanism to move relative to the second fixed grille 31 along the extension direction (specifically the front-rear direction) of the second fixed grille 31, so as to change the overlapping area of the third air inlet holes 310 on the second fixed grille 31 and the fourth air inlet holes 320 on the second movable grille 32, i.e. to change the air volume of the second air duct 1212. The corresponding air inlet holes on the above-mentioned first fixed grille 21, first movable grille 22, second fixed grille 31 and second movable grille 32 adopt vertically extending strip-shaped holes, i.e. perpendicular to the moving direction of the corresponding movable grille, which can shorten the moving stroke of the movable grille relative to the fixed grille as much as possible on the basis of ensuring that the grille assembly can adjust the air volume, and avoid occupying a large space in the smoke hood 12 or the fan stand 11.

[0048] One of the first fixed grille 21 and the first movable grille 22 is provided with a first limiting sliding groove 221, and the other is provided with a first limiting column 211 which is slidingly constrained in the first limiting sliding groove 221, and the extension direction of the above-mentioned first limiting sliding groove 221 is consistent with the moving direction of the first movable grille 22. Specifically, as shown in the drawings, the first limiting sliding groove 221 is arranged on the first movable grille 22, and the first limiting column 211 is arranged on the first fixed grille 21.Figure 4 As shown, the first movable grid 22 is provided with a plurality of first limiting sliding grooves 221, and the extending direction of each first limiting sliding groove 221 is the front-back direction. The first fixed grid 21 is provided with corresponding first limiting columns 211, the extending direction of the first limiting column 211 is perpendicular to the main body of the first fixed grid 21, and the number of the first limiting column 211 is consistent with the number of the first limiting sliding groove 221. Similarly, one of the second fixed grid 31 and the second movable grid 32 is provided with a second limiting sliding groove 321, and the other is provided with a second limiting column 311 which is slidingly constrained in the second limiting sliding groove 321. The extending direction of the above-mentioned second limiting sliding groove 321 is consistent with the moving direction of the second movable grid 32. Specifically, as shown in the figure, Figure 5 As shown, the second movable grid 32 is provided with a plurality of second limiting sliding grooves 321, and the extending direction of each second limiting sliding groove 321 is the front-back direction. The second fixed grid 31 is provided with corresponding second limiting columns 311, the extending direction of the second limiting column 311 is perpendicular to the main body of the second fixed grid 31, and the number of the second limiting column 311 is consistent with the number of the second limiting sliding groove 321.

[0049] The first movable grid 22 is driven by a first driving mechanism to move back and forth relative to the first fixed grid 21. The second movable grid 32 is driven by a second driving mechanism to move back and forth relative to the second fixed grid 31. Generally, the first driving mechanism for driving the first air inlet grid assembly 20 to move and the second driving mechanism for driving the second air inlet grid assembly 30 to move can adopt different driving mechanisms independently, such as two independent electric push rods. However, in order to reduce the number of driving mechanisms, reduce the occupied space in the shell, and reduce the cost, in the embodiment, the first driving mechanism and the second driving mechanism share the same driving member. Specifically, the driving member includes a driving motor 41, an output shaft of the driving motor 41 is connected with a transmission shaft 42 extending left and right, and the transmission shaft 42 can be driven by the driving motor 41 to rotate around its axis. The first fixed grid 21 and the second fixed grid 31 are vertically arranged, and the left and right ends of the transmission shaft 42 are rotatably supported on the first fixed grid 21 and the second fixed grid 31 respectively. The first fixed grid 21 is provided with a first shaft hole 212 for the first end of the transmission shaft 42 to pass through, and the second fixed grid 31 is provided with a second shaft hole 312 for the second end of the transmission shaft 42 to pass through. The first end of the transmission shaft 42 is connected with the first movable grid 22 through a first connecting rod assembly, and the second end of the transmission shaft 42 is connected with the second movable grid 32 through a second connecting rod assembly. The first connecting rod assembly includes a first connecting rod 431 and a second connecting rod 432. The first end of the first connecting rod 431 is connected with the first end of the transmission shaft 42 and rotates around the axis of the transmission shaft 42 under the driving of the transmission shaft 42. The first end of the second connecting rod 432 is rotatably connected with the second end of the first connecting rod 431 (the relative rotation axis also extends left and right), and the second end of the second connecting rod 432 is rotatably connected with the first movable grid 22 (the relative rotation axis also extends left and right). Similarly, the second connecting rod assembly includes a third connecting rod 433 and a fourth connecting rod 434. The first end of the third connecting rod 433 is connected with the second end of the transmission shaft 42 and rotates around the axis of the transmission shaft 42 under the driving of the transmission shaft 42. The first end of the fourth connecting rod 434 is rotatably connected with the second end of the third connecting rod 433 (the relative rotation axis also extends left and right), and the second end of the fourth connecting rod 434 is rotatably connected with the second movable grid 32 (the relative rotation axis also extends left and right). When the driving motor 41 drives the transmission shaft 42 to rotate, the first movable grid 22 and the second movable grid 32 can be driven to move back and forth through the corresponding first connecting rod assembly and second connecting rod assembly, so as to change the air inlet volume of the first air inlet grid assembly 20 and the second air inlet grid assembly 30. The driving motor 41, the transmission shaft 42, and the first connecting rod assembly constitute the first driving mechanism of the embodiment. The driving motor 41, the transmission shaft 42, and the second connecting rod assembly constitute the second driving mechanism of the embodiment.

[0050] The first fixed grid 21 and the second fixed grid 31 are further provided with a support plate 5 extending leftward and rightward and connected between the two. In order to ensure the overall strength, the first fixed grid 21, the second fixed grid 31 and the support plate 5 can be designed integrally.

[0051] The front side or the rear side of the smoke hood 12 further defines an installation cavity 123 for placing the driving motor 41 and the transmission shaft 42, such as Figure 4 It is shown that the installation cavity 123 is arranged at the rear side of the smoke hood 12, and the driving motor 41, the transmission shaft 42 and other components are arranged in the installation cavity 123, so that the driving motor 41, the transmission shaft 42 and other components can be prevented from being polluted by contacting the oil fume, and the service life thereof is improved.

[0052] The total area of the overlap of each first air inlet hole 210 on the first air inlet grid and each second air inlet hole 220 is denoted as S1, and the total area of the overlap of each third air inlet hole 310 on the second air inlet grid and each fourth air inlet hole 320 is denoted as S2. The first air inlet grid assembly 20 and the second air inlet grid assembly 30 have at least a first state, a second state and a third state under the driving of the driving member:

[0053] In the first state, S1 is the same as S2, and neither S1 nor S2 is zero, such as Figure 6 It is shown that the air inlet state, the air inlet volume of the first air inlet grid assembly 20 is the same as that of the second air inlet grid assembly 30, and is basically half of the maximum air inlet volume of the first air inlet grid assembly 20 (or the second air inlet grid assembly 30). In this case, it is suitable for the situation that both sides are in the cooking state.

[0054] In the second state, S1 is greater than S2, and S2≥0; in the third state, S2 is less than S1, and S1≥0. When the cooking states of the left side and the right side are different in intensity, the second state or the third state can be selected according to the actual situation. When S1=0 or S2=0, it indicates that the air inlet grid assembly on one side is in the closed state, that is, the side does not perform the cooking operation.

[0055] The action process of the driving mechanism is as follows: when the transmission shaft 42 rotates in the counterclockwise direction under the driving of the driving motor 41, the second movable grid 32 on the right side translates backward, and the first movable grid 22 on the left side translates forward. At this time, the ventilation area of the right air inlet grid assembly gradually decreases, and the ventilation area of the left air inlet grid assembly gradually increases. When the translation reaches Figure 7In the state, the right side of the air inlet grille assembly is completely closed, and the left side is completely opened. At this time, the air volume of the first air duct 1211 on the left side reaches the maximum, and the air volume of the second air duct 1212 on the right side is zero. This state is suitable for left side cooking alone. It should be noted that in order to ensure that the total air volume of the fan is not increased, the sum of the ventilation areas of the left and right sides, that is, the total ventilation area, is always kept unchanged during the translation movement.

Claims

1. A range hood, comprising: a fan frame (11); a hood (12) located below the fan frame (11), the bottom of the hood (12) having a main suction port (120), a first smoke collection chamber (1203) located on the left side of the main suction port (120), and a second smoke collection chamber (1204) located on the right side of the main suction port (120), the inner wall of the first smoke collection chamber (1203) having a first suction port (1201) formed therein, and the inner wall of the second smoke collection chamber (1204) having a second suction port (1202) formed therein; characterized in that the first smoke collection chamber (1203) extends in the front-rear direction as a whole, and the left-right dimension of a vertical cross section thereof taken in the left-right direction gradually decreases from bottom to top, the first suction port (1201) is located at or adjacent to the top of the first smoke collection chamber (1203), and the position of the first suction port (1201) is closer to the left side edge of the first smoke collection chamber (1203) in the left-right direction, the second smoke collection chamber (1204) extends in the front-rear direction as a whole, and the left-right dimension of a vertical cross section thereof taken in the left-right direction gradually decreases from bottom to top, the second suction port (1202) is located at or adjacent to the top of the second smoke collection chamber (1204), and the position of the second suction port (1202) is closer to the right side edge of the second smoke collection chamber (1204) in the left-right direction.

2. The hood according to claim 1, characterized in that: The vertical cross section of the first smoke collection chamber (1203) taken in the left-right direction is in the shape of a triangle that is large at the bottom and small at the top, and the vertical cross section of the second smoke collection chamber (1204) taken in the left-right direction is in the shape of a triangle that is large at the bottom and small at the top.

3. The hood according to claim 2, characterized in that: The bottom wall of the hood (12) includes a first flow guide wall (1251) that slopes to the right from top to bottom and a second flow guide wall (1252) that slopes to the left from top to bottom in a region corresponding to the first smoke collection chamber (1203), and the top of the first flow guide wall (1251) is connected to the top of the second flow guide wall (1252); The bottom wall of the hood (12) includes a third flow guide wall (1253) that slopes to the left from top to bottom and a fourth flow guide wall (1254) that slopes to the right from top to bottom in a region corresponding to the second smoke collection chamber (1204), and the top of the third flow guide wall (1253) is connected to the top of the fourth flow guide wall (1254).

4. The hood according to claim 3, characterized in that: The inclination angle of the first flow guide wall (1251) relative to the vertical direction is greater than the inclination angle of the second flow guide wall (1252) relative to the vertical direction, and the inclination angle of the third flow guide wall (1253) relative to the vertical direction is greater than the inclination angle of the fourth flow guide wall (1254) relative to the vertical direction.

5. The hood according to claim 3, characterized in that: The first suction port (1201) is provided at the top of the second flow guide wall (1252) and is in the shape of a strip extending in the front-rear direction, and the second suction port (1202) is provided at the top of the fourth flow guide wall (1254) and is in the shape of a strip extending in the front-rear direction.

6. The hood according to claim 1, characterized in that: The smoke hood (12) defines a first air duct (1211) communicating the first air inlet (1201) with the interior space of the fan stand (11) and a second air duct (1212) communicating the second air inlet (1202) with the interior space of the fan stand (11), the first air duct (1211) gradually increasing in size from left to right, and the second air duct (1212) gradually increasing in size from right to left.

7. The hood according to claim 6, characterized in that: The area of the smoke hood (12) opposite the first air inlet (1201) is configured with a first curved wall surface (1261) gradually bending from the first air inlet (1201) to the first air duct (1211), and the area of the smoke hood (12) opposite the second air inlet (1202) is configured with a second curved wall surface (1262) gradually bending from the second air inlet (1202) to the second air duct (1212).

8. The hood according to claim 7, characterized in that: The first curved wall surface (1261) has a helical cross section with a gradually increasing radius of curvature from the first air inlet (1201) to the first air duct (1211), and the second curved wall surface (1262) has a helical cross section with a gradually increasing radius of curvature from the second air inlet (1202) to the second air duct (1212).

9. The hood according to claim 6, characterized in that: The first air duct (1211) has a first air outlet (1221) communicating with the interior space of the fan stand (11), and the second air duct (1212) has a second air outlet (1222) communicating with the interior space of the fan stand (11), the first air outlet (1221) being provided with a first air inlet grille assembly (20) capable of changing the ventilation volume of the first air duct (1211), and the second air outlet (1222) being provided with a second air inlet grille assembly (30) capable of changing the ventilation volume of the second air duct (1212).

10. The hood according to claim 9, characterized in that: The first air inlet grille assembly (20) comprises: a first fixed grille (21) having first air inlet holes (210) distributed thereon; a first movable grille (22) arranged on the upstream side or the downstream side of the first fixed grille (21) and having second air inlet holes (220) distributed thereon, the first movable grille (22) being driven by a first driving mechanism to move relative to the first fixed grille (21) along the extension direction of the first fixed grille (21) to change the overlapping area of the first air inlet holes (210) on the first fixed grille (21) and the second air inlet holes (220) on the first movable grille (22); The second air inlet grille assembly (30) comprises: a second fixed grille (31) having third air inlet holes (310) distributed thereon; A second movable grid (32) is arranged on the upstream side or the downstream side of the second fixed grid (31) and has fourth air inlets (320) distributed thereon. The second movable grid (32) is driven by a second driving mechanism to move relative to the second fixed grid (31) along the extension direction of the second fixed grid (31) so as to change the overlapping area of the third air inlets (310) on the second fixed grid (31) and the fourth air inlets (320) on the second movable grid (32).

Images