CN117167794A - Fume exhauster - Google Patents

Abstract

The invention discloses a range hood, which comprises an air inlet assembly and an upper box body for arranging a fan system, wherein the bottom surface of the upper box body is provided with an air inlet, and the air inlet assembly comprises: the lower box body is provided with a backboard extending downwards from the bottom of the upper box body; and draw in cigarette plate, including baffle and fender cigarette board, the length of fender cigarette board is L2, baffle and fender cigarette board have closed state and open state: when the air inlet is closed, the baffle plate closes the air inlet, the smoke baffle plate covers the front surface of the back plate, and the vertical distance between the lower edge of the smoke baffle plate and the back plate is d1; when the air inlet is opened, the air inlet is opened by the baffle, a smoke collecting cavity is formed between the smoke baffle and the front surface of the backboard, the vertical distance between the lower edge of the smoke baffle and the backboard is d2, the included angle between the smoke baffle and the backboard is beta, and the following relation is satisfied: d2-L2 sin β > d1.

Description

Fume exhauster

The present invention claims priority from the following chinese patent applications:

1. the application number is 202211324451.1, the application date is 2022, 10 months and 27 days, and the invention name is 'a range hood';

2. the application number is 202211324487.X, the application date is 2022, 10 and 27, and the invention is named as a range hood.

Technical Field

The invention relates to a lampblack purifying device, in particular to a range hood.

Background

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

Because of the limited space in the kitchen, in order to improve the space utilization of the kitchen, a thin range hood has been known, such as a novel range hood disclosed in chinese patent application No. 202021790417, comprising: the host comprises a host shell and a fan arranged in the host shell; the smoke sucking device is arranged below the main machine and comprises a smoke inlet surface, wherein the fan sucks the oil smoke above the kitchen range into the smoke sucking device from the smoke inlet surface when in operation; the smoke baffle is rotatably connected with the smoke inlet surface and used for preventing the oil smoke above the kitchen range from escaping outwards when the smoke baffle rotates to a certain angle; another novel range hood disclosed in chinese patent application No. 202020358616.7 includes: the host comprises a host shell and a fan arranged in the host shell; the upper machine body is arranged below the host machine, and an upper air inlet is arranged at the bottom of the machine body of the upper machine body; the lower machine body is arranged below the upper machine body, the upper machine body and the lower machine body are of an inverted L-shaped structure, and the interior of the lower machine body is communicated with the interior of the upper machine body; the lower machine body is provided with a lower air inlet, and one side of the lower air inlet, which is away from the lower machine body, is provided with a main smoke baffle plate; the first side of main smoke baffle passes through the pivot setting and is in the upside of air intake down, and main smoke baffle can rotate round the pivot.

From the above, the depth of the smoke collecting area is not large after the smoke baffle plate rotates to the opening position, so that the smoke is easy to escape, and the smoke absorbing effect is not ideal. If the rotation mode is to lead the negative pressure area to be expanded outwards so as to improve the smoke gathering effect, the rotation mode can lead to shielding of the sight, and the cooking operation is greatly influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing the range hood aiming at the defects of the prior art, and the negative pressure area expands outwards during working to improve the fume suction effect.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a range hood, includes air inlet subassembly and is used for setting up fan system's last box, the air intake has been seted up to the bottom surface of going up the box, its characterized in that: the air inlet assembly includes:

the lower box body is provided with a backboard extending downwards from the bottom of the upper box body; and

the cigarette collecting plate comprises a baffle and a cigarette blocking plate, wherein the length of the cigarette blocking plate is L2, and the baffle and the cigarette blocking plate are in a closed state and an open state:

when the air inlet is closed, the baffle plate closes the air inlet, the smoke baffle plate covers the front surface of the back plate, and the vertical distance between the lower edge of the smoke baffle plate and the back plate is d1;

when the air inlet is opened, the air inlet is opened by the baffle, a smoke collecting cavity is formed between the smoke baffle and the front surface of the backboard, the vertical distance between the lower edge of the smoke baffle and the backboard is d2, the included angle between the smoke baffle and the backboard is beta, and the following relation is satisfied: d2-L2 sin β > d1.

By arranging the smoke baffle and the baffle, the air inlet can be closed in a shutdown state and the air inlet can be opened in a working state, and meanwhile, when the air inlet is opened, the smoke baffle and the baffle can move forward together with the smoke baffle forming a smoke collecting cavity together with the back plate.

Preferably, the value range of d2 satisfies the following relationship: d2 And the range is more than or equal to 400mm so as to obtain enough smoke gathering range.

Preferably, in the closed state, the smoke baffle is parallel to the back plate, so that the ultrathin design of the air inlet assembly can be realized, and the space utilization rate is improved.

Further, the depth dimension of the air inlet is larger than the back plate of the lower box body. Because the depth of the air inlet is larger, the larger air inlet area can be ensured, the air inlet flow is ensured, the range hood is extremely light and thin, the occupied space of the exposed part of the range hood is reduced, and the space utilization rate is improved.

Preferably, the thickness dimension of the lower box body part corresponding to the backboard is not more than 50mm.

Further, one side of the lower box body corresponding to the smoke gathering plate member forms an inner concave part, and the inner concave part forms a part of the smoke gathering cavity, so that the range of the smoke gathering cavity is further enlarged.

According to one aspect of the invention, the smoke baffle is rotatably connected to the baffle.

Further, in the open state, the included angle of the baffle plate relative to the back plate is alpha, and beta is more than or equal to alpha. So as to ensure smooth air intake, avoid the oil smoke from striking at the junction of the baffle and the smoke baffle to form vortex, and better guide the oil smoke into the upper box body through the air inlet.

Preferably, the value range of α is less than 55 °, less than 50 ° or less than 45 °, and the value range of β is less than 55 °, less than 50 ° or less than 45 °, so as to avoid excessively large opening angle from blocking the line of sight.

Preferably, the length of the baffle is L1, and when in an open state, the vertical distance d2=l1+l2+sinβ+d1 between the lower edge of the smoke baffle and the back plate, thereby expanding and descending the negative pressure area at the same time, and further improving the smoke absorbing effect.

Preferably, the length of the baffle is L1, L1: the range of the L2 is 1:4-1:1.5, the total height of the two plates is basically limited on the premise that cooking is not affected after the baffle and the smoke baffle are opened, when the proportion is continuously increased, the smoke baffle is close to the face of a user after being opened, user experience is affected, and vision can be possibly blocked, and the proportion is too small, the width of the air inlet is small, and the air inlet smoothness is affected.

In order to realize the maximum air inlet area and the smoke gathering area, the baffle is rotationally connected with the upper box body or the lower box body at the front side or the position close to the front side of the air inlet, the upper end part of the smoke baffle is connected with the free end of the baffle, and the free end of the baffle covers the air inlet when the baffle is in a state of closing the air inlet.

Further, the range hood further comprises a first movement mechanism for driving the smoke baffle plate and the baffle plate to be linked, the first movement mechanism comprises a rotation driving module and a first connecting rod driven to rotate by the rotation driving module, one end of the first connecting rod is rotationally connected with the upper box body, and the other end of the first connecting rod is fixed with the smoke baffle plate, so that the movement mechanism can be simplified.

Further, in order to maximize the effect of the baffle on lengthening the length of the smoke baffle, the smoke gathering area is maximized, sliding grooves are formed in the left side and the right side of the baffle, a rotating shaft is arranged in the lower box body or the upper box body, and the rotating shaft is matched in the sliding grooves.

Preferably, for reducing left and right sides oil smoke escape, the lower box still includes first curb plate and roof, the roof is formed by the top of backplate extending forward, the width of backplate is greater than the width of last box, the roof is located the left and right sides of last box, first curb plate sets up the left and right sides at roof and backplate, the pivot sets up on first curb plate.

According to another aspect of the invention, the baffle is disposed at the air intake and is movable back and forth.

Further, the range hood further comprises a second movement mechanism for driving the smoke baffle plate and the baffle plate to be linked, the second movement mechanism comprises a linear driving module, a guide rail assembly and a second connecting rod, the guide rail assembly comprises a first guide rail fixed in an upper box body and a second guide rail in sliding fit with the first guide rail, the output end of the linear driving module is connected with the second guide rail, the baffle plate is fixedly connected with the second guide rail to synchronously move, and the second connecting rod is rotationally connected with the second guide rail and is fixedly connected with the smoke baffle plate. The movement mechanism can thereby be simplified.

Further, the second movement mechanism comprises a driving end and a driven end, the positions, connected with the smoke baffle, of the driving end and the driven end are arranged at intervals in the left-right direction, the positions, connected with the baffle, of the driving end and the driven end are arranged at intervals in the left-right direction, the driving end and the driven end comprise the guide rail assembly and the second connecting rod, and the driving end further comprises the linear driving module. The smoke baffle plate is connected with the guide rail assembly, the front-back movement of the second guide rail at the driving end determines the rotation angle of the smoke baffle plate, and then the front-back movement of the second guide rail at the driven end can be controlled; and secondly, when the movement of the left side and the right side is asynchronous, the difference of the shape and the distance of the second guide rails on the two sides causes the difference of the rotation angles of the smoke baffle, and the smoke baffle is distorted, so that the asynchronous movement can be corrected.

Further, in order to enable the second connecting rod to stably rotate, the second movement mechanism further comprises a third connecting rod, one end of the second connecting rod is fixed with the upper end of the smoke baffle, the other end of the second connecting rod is rotatably connected with one end of the third connecting rod, and the other end of the third connecting rod is rotatably arranged in the upper box body.

Compared with the prior art, the invention has the advantages that: by arranging the smoke baffle and the baffle, the air inlet can be closed in a shutdown state and the air inlet can be opened in a working state, and meanwhile, when the air inlet is opened, the smoke baffle and the baffle can move forwards together with the smoke baffle forming a smoke collecting cavity together with the back plate.

Drawings

Fig. 1 is a schematic view showing a closed state of a range hood according to a first embodiment of the present invention;

fig. 2 is a cross-sectional view of the range hood of fig. 1;

FIG. 3 is an enlarged schematic view of portion I of FIG. 2;

fig. 4 is a schematic view of a smoke baffle, a baffle and a movement mechanism thereof of the range hood of fig. 1;

fig. 5 is a schematic view showing an opened intermediate state of a range hood according to a first embodiment of the present invention;

fig. 6 is a cross-sectional view of the range hood of fig. 5;

fig. 7 is a schematic view showing an opened state of a range hood according to a first embodiment of the present invention;

fig. 8 is a cross-sectional view of the range hood of fig. 7;

fig. 9 is a schematic view of a smoke baffle plate, a baffle plate and a movement mechanism thereof of a range hood according to a second embodiment of the present invention;

fig. 10 is a schematic view of a smoke baffle plate, a baffle plate and a movement mechanism thereof of a range hood according to a third embodiment of the present invention;

fig. 11 is a schematic view showing a closed state of a range hood according to a fourth embodiment of the present invention;

fig. 12 is a cross-sectional view of the range hood of fig. 11;

FIG. 13 is a schematic view of a smoke baffle, a baffle and a movement mechanism of the range hood of FIG. 11;

FIG. 14 is an enlarged schematic view of portion II of FIG. 13;

fig. 15 is a schematic view showing an opened intermediate state of a range hood according to a fourth embodiment of the present invention;

fig. 16 is a cross-sectional view of the range hood of fig. 15;

fig. 17 is a schematic view showing an opened state of a range hood according to a fourth embodiment of the present invention;

fig. 18 is a cross-sectional view of the range hood of fig. 17;

fig. 19 is a sectional view showing a closed state of a range hood according to a fifth embodiment of the present invention;

fig. 20 is an opened state sectional view of a range hood according to a fifth embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Example 1

Referring to fig. 1 to 6, a range hood comprises an air inlet assembly 1 and an upper box 2, wherein a fan system 3 is arranged in the upper box 2. In the installation state, the upper box body 2 is hidden in a kitchen cabinet, the bottom surface of the upper box body 2 can be flush with the kitchen cabinet, and only the air inlet component 1 is exposed below the kitchen cabinet. Alternatively, the fan system 3 may be provided in another box communicating with the upper box 2.

The air intake assembly 1 comprises a lower box 11, a smoke baffle 12 and a baffle 13, wherein the smoke baffle 12 and the baffle 13 form a smoke collecting plate, the bottom of the upper box 2 is preferably provided with an air intake 21 at a position close to the rear end, and the air intake 21 extends in the left-right direction. The fan system 3 is close to the front side setting of last box 2, be provided with filter screen 5 in the last box 2, filter screen 5 is located the top of air intake 21 to extend forward beyond air intake 21, filter screen 5 is by preceding back gradually downward sloping, and filter screen 5 does not offer the mesh and is the closure in the position that corresponds with fan system 3, and the structure and the arrangement of filter screen 5 can prevent that the oil droplet from flying out in the work, simultaneously with the condensate oil guide rear side in the fan system 3, collect in the oil cup 6 of setting in lower box 11 bottom through lower box 11.

The lower case 11 includes a back plate 111, a first side plate 112, and a top plate 113, the back plate 111 is located below the rear side of the upper case 2, the bottom end of the upper case 2 extends downward, the top plate 113 extends forward from the top end of the back plate 111, and the back plate 111, the first side plate 112, and the top plate 113 may be independent plates or may be integrated plates. The top plate 113 may be in a state of gradually tilting downward from front to rear, the width (the dimension in the left-right direction) of the back plate 111 being larger than the width of the upper case 2, the top plate 113 being located at both left and right sides of the upper case 2, preferably, the top plate 113 being close to the lower end portion of the upper case 2. The first side plates 112 are disposed at left and right sides of the top plate 113. The first side plate 112 may be provided on the left and right sides of the back plate 111 or the left and right sides of the smoke barrier 12. Referring to fig. 8, the depth h1 (the dimension in the front-rear direction) of the air intake 21 is greater than the thickness h2 of the corresponding lower case 11 portion at the back plate 111 by not more than 50mm.

The lower case 11 is formed with an inner recess 114 on the side corresponding to the smoke collecting plate member, and the inner recess 114 is formed in a shape recessed in a direction away from the smoke baffle plate 12. Alternatively, the width of the back plate 111 may be made equal to the width of the upper case 2, and the first side plates 112 may be provided on the left and right sides of the back plate 111 or the left and right sides of the smoke barrier plate 12 without providing the top plate 113.

The smoke barrier 12 is rotatably provided at the front side of the back plate 111, and has an upper end portion or a position near the upper end portion for connection, and a lower end portion which is a free end, and a rotation axis extending in the left-right direction, and functions as a smoke gathering effect when opened. The shutter 13 is rotatably provided at the air intake 21, and the rotation axis extends in the left-right direction to open and close the air intake 21. The damper 13 is rotatably connected to the front side or the position close to the front side of the air inlet 21, and the upper end portion of the smoke damper 12 is connected to the free end (rear end portion in the closed state) of the damper 13. The baffle 13 closes the air inlet 21 while closing both front and rear ends of the top plate 113.

The smoke baffle 12 and the baffle 13 can move independently or can be linked. In the present embodiment, the movement patterns of the smoke blocking plate 12 and the baffle 13 are linked, and for this purpose, the range hood further includes a movement mechanism for driving the smoke blocking plate 12 and the baffle 13 to be linked. The movement mechanism comprises a driving mechanism 41 and a transmission mechanism, the driving mechanism 41 is preferably an electric push rod, the transmission mechanism comprises a first connecting rod 421, one end of the first connecting rod 421 is rotationally connected with the inner side of the upper box body 2, the other end of the first connecting rod 421 is fixed with the smoke baffle plate 12, the electric push rod (except for a main body part of the push rod used for outputting) is rotationally connected with the upper box body 2, and a part between the push rod of the electric push rod and two ends of the first connecting rod 421 is rotationally connected, and a rotation axis of the first connecting rod 421 extends along the left-right direction. The first link 421 is connected to the upper case 2 at a position of the rotation center of the smoke barrier 12. The first link 421 has a curved shape protruding rearward, thereby avoiding interference with the shutter 13 during movement. The rotatable electric push rod forms a rotation driving module.

The components of the above-described movement mechanism constitute the drive end of the movement mechanism, which also comprises the driven end, which has only the transmission mechanism. The driving end and the driven end are respectively connected with the left and right spaced positions on the smoke baffle 12.

The rear end portion of the baffle 13 is rotatably connected to the upper end portion of the smoke baffle 12, and the rotation axis extends in the left-right direction. The left and right sides of the baffle 13 are provided with a chute 131, the first side plate 112 is provided with a rotating shaft 132 matched with the chute 131, and the rotating shaft 132 can also rotate relative to the chute 131. When the widths of the back plate 111 and the upper case 2 are the same, the rotation shaft 132 may be disposed in the upper case 2. I.e. the baffle 13 is rotatably arranged with respect to the upper housing 2.

Referring to fig. 1 and 2, the range hood is in a closed state, the baffle 13 closes the air inlet 21, the free end of the baffle 13 covers the air inlet 21, the smoke baffle 12 is located at the front side of the back plate 111, covers the front surface of the back plate 111, is in a substantially vertical state, and can be attached to the back plate 111. The depth (the dimension in the front-rear direction) of the air inlet 21 is larger than the distance between the upper end of the back plate 111 and the upper end of the smoke baffle 12, thereby ensuring a larger air inlet area when the air inlet 21 is opened on the premise that the lower case 11 is light and thin. At this time, the vertical distance between the lower edge of the smoke barrier 12 and the back plate 111 is d1. Preferably, at this point, the smoke barrier 12 and the back panel 111 are parallel, where "parallel" means that the angle between the two is less than 10 °.

Referring to fig. 5 and 6, the driving mechanism 41 pushes the first link 421 to rotate around the counterclockwise direction shown in fig. 6, so as to push the smoke barrier 12 outwards to turn, thereby driving the baffle 13 to rotate, and the movement track of the baffle 13 is further defined by the cooperation of the rotating shaft 132 and the sliding groove 131.

Referring to fig. 7 and 8, the smoke baffle 12 is opened to a limit position, at this time, the baffle 13 and the smoke baffle 12 are in an unfolded state and almost in the same plane, and the baffle 13 and the smoke baffle 12 together form a smoke collecting plate, so that the length of the original smoke baffle 12 is prolonged, and the smoke collecting range can be made larger. At this time, the smoke baffle 12 is located at the front side of the closed position, the smoke baffle 12 and the baffle 13 together form a smoke collecting cavity Q with the front surface of the back plate 111, the concave portion 114 is also formed as a part of the smoke collecting cavity Q, the smoke collecting cavity Q is communicated with the interior of the upper case 2 through the air inlet 21, and the smoke enters the upper case 2 from the rear side of the smoke baffle 12 and the baffle 13 through the air inlet 21.

The length of the baffle 13 is L1, and the length of the smoke baffle 12 is L2, L1: the value range of L2 is 1:4-1:1.5, and the total height of the baffle plate and the smoke baffle plate is basically limited on the premise that cooking is not affected after the opening. When the proportion is continuously increased, the smoke baffle is closer to the face of a user after being opened, the user experience is affected, and the sight line is possibly blocked, although the L2 is larger, the lower end part of the smoke baffle is lower, the negative pressure area is lower, the improvement of the oil smoke absorption effect is facilitated, and the risk of boiling the pan is increased; and the proportion is too small, the width of the air inlet is small, and the air inlet smoothness is affected.

In the open state, the baffle 13 forms an angle α with respect to the back plate 111 (the back plate 111 is generally vertical in the normal installation state of the range hood), the smoke baffle 12 forms an angle β with respect to the back plate 111, the vertical distance between the lower edge of the smoke baffle 12 and the back plate 111 is d2, d2=l1×sinα+l2×sinβ+d1, and the following relationship is preferably satisfied: d2-L2 sin β > d1. The value range of d2 preferably meets the requirement that d2 is more than or equal to 400mm. Therefore, the negative pressure area is expanded outwards, and the fume suction effect is improved. The value range of alpha is preferably less than 55 degrees, less than 50 degrees or less than 45 degrees; the value range of beta is less than 55 degrees, less than 50 degrees or less than 45 degrees, so that the situation that the opening angle is too large to block the sight is avoided. The above included angle preferably satisfies the following relationship: beta is larger than or equal to alpha so as to ensure smooth air inlet, avoid vortex formed by oil smoke striking at the joint of the baffle 13 and the smoke baffle 12, and better guide the oil smoke into the upper box body 2 through the air inlet 21.

According to the embodiment, the baffle 13 at the air inlet of the range hood is folded and unfolded relative to the smoke baffle 12, so that the range hood is extremely light and thin in a shutdown state, has a large air inlet channel and a large smoke collecting range in a working state, and achieves the effects of light and thin range hood. The form also makes the air inlet assembly 1 not need to form an air inlet channel, and the smoke baffle 12 can be close to the back plate 111 when the air inlet assembly 1 is closed, so that the whole thickness of the air inlet assembly 1 is extremely thin and light, and is preferably about ten millimeters.

Example two

Referring to fig. 9, in the present embodiment, the difference from the first embodiment is that the driving mechanism 41 adopts a motor, the transmission mechanism further includes a first gear 422 and a first rack 423, the first gear 422 is in transmission connection with an output shaft of the motor and is rotatable about an axis extending left and right, the first gear 422 is meshed with the first rack 423, the first rack 423 is in a fan shape, teeth of the first rack 423 are formed on an arc surface of the fan shape, and the first rack 423 is fixed with the first link 421. The motor, the first gear 422 and the first rack 423 constitute a rotation driving module.

Therefore, when the motor is started, the first gear 422 can drive the first rack 423 to rotate, and then drive the first link 421 to rotate.

Example III

Referring to fig. 10, in the present embodiment, the difference from the second embodiment is that the first link 421 is directly connected to the output shaft of the motor in a transmission manner, and is directly driven to rotate by the motor.

Example IV

Referring to fig. 11 to 16, the difference from the first embodiment is that the air inlet 21 is provided at a position near the rear end of the bottom surface of the upper case 2. The air intake assembly 1 includes only the back plate 111 (i.e., the lower case 11 includes only the back plate 111) in addition to the smoke baffle plate 12 and the baffle plate 13, and the back plate 111 extends downward from the rear side of the upper case 2, which may be independent of or integral with the upper case 2.

The smoke barrier 12 is rotatably provided on the front side of the back plate 111, the lower end portion thereof is a free end, and the rotation axis extends in the left-right direction. The baffle 13 is movably disposed at the air inlet 21 back and forth, and the baffle 13 may be slightly higher than the bottom surface of the upper case 2 to avoid interference. Wherein the upper end of the smoke barrier 12 is located at the air inlet 21 and can move forward and backward, preferably, the smoke barrier 12 abuts against the rear end of the baffle 13.

The smoke barrier 12 and the baffle 13 may be driven by separate second movement mechanisms or driven by the same movement mechanism to be linked. In the present embodiment, the movement forms of the smoke blocking plate 12 and the baffle 13 are linked, and for this purpose, the range hood further includes a second movement mechanism for driving the smoke blocking plate 12 and the baffle 13 to be linked. The second motion mechanism includes a second driving mechanism 43 and a second transmission mechanism, the second driving mechanism 43 is preferably a motor, the second transmission mechanism includes a second gear 441, a second rack 442, a rail assembly 443, a second link 444 and a third link 445, an output end of the second driving mechanism 43 is in transmission connection with the second gear 441, as in the present embodiment, the second gear 441 may be disposed on an output shaft of the second driving mechanism 43 (motor), and a rotation axis of the second gear 441 extends in a left-right direction. The second rack 442 is engaged with the second gear 441, the rail assembly 443 includes a first rail 4431 fixed in the upper case 2 and a second rail 4432 slidably fitted with the first rail 4431, the second rack 442 is fixed with the second rail 4432, and the barrier 13 is fixed with the second rail 4432. Therefore, when the second driving mechanism 43 is started, the second guide rail 4432 is driven to slide back and forth by the cooperation of the rack and pinion, and the baffle 13 is driven to slide back and forth.

The second link 444 is rotatably disposed on the second guide rail 4432, one end of which is fixed to the upper end portion of the smoke barrier 12, and the other end of which is rotatably connected to one end of the third link 445, and the other end of the third link 445 is rotatably disposed in the upper case 2. The rotational axes of the second link 444 and the third link 445 each extend in the front-rear direction. Therefore, when the second guide rail 4432 slides forwards and backwards, the second connecting rod 444 can be driven to rotate, so that the smoke baffle 12 is driven to realize the composite motion of moving forwards and backwards and rotating around the rotating joint with the second guide rail 4432, and the upper end part of the smoke baffle 12 is kept close to the rear end part of the baffle 13 in the motion process, so that the pressure relief caused by gaps is avoided. The third link 445 described above stabilizes the rotation of the second link 444.

The above-mentioned components of the second movement mechanism form the driving end of the second movement mechanism, the second movement mechanism further includes the driven end, the difference from the driving end is that only including guide rail assembly 443, second link 444 and third link 445, the driving end is connected to one of the left and right sides of the smoke baffle 12, baffle 13, the driven end is connected to the other of the left and right sides of the smoke baffle 12, baffle 13, achieve the synchronous movement precision of the left and right sides of the smoke baffle 12, baffle 13.

By adopting the second movement mechanism of the present embodiment, the smoke baffle 12 is connected with the guide rail assembly 443, the front-back movement of the driving end second guide rail 4432 determines the rotation angle of the smoke baffle 12, so that the front-back movement of the driven end second guide rail 4432 can be controlled, because the smoke baffle 12 is not absolutely rigid, the two side second guide rails 4432 have a stroke difference at the front end and the rear end in the movement system respectively, and the baffle 13 can directly connect the two side second guide rails 4432, thereby ensuring the synchronization of the two side movements (similar to making a closed loop structure at the front end and the rear end). Secondly, when the movement of the left side and the right side is asynchronous, the difference of the shape and the distance of the second guide rails 4432 on the two sides causes the difference of the rotation angles of the smoke baffle 12, and the smoke baffle 12 is distorted, so that the asynchronous movement can be corrected.

In order to ensure the consistency of the rotation direction when the smoke barrier 12 is opened or closed, the distance from the rotation connection point of the third link 445 and the upper case 2 to the rear side of the upper case 2 is less than or equal to the distance from the rotation connection point of the third link 445 and the second link 444 to the rear side of the upper case 2.

The left and right sides of the smoke barrier 12 are further provided with second side plates 14, and the second side plates 14 extend rearward from the left and right sides of the smoke barrier 12. When the air inlet assembly 1 is closed, the second side plate 14 wraps the back plate 111, so that the fit clearance of the exposed surface can be reduced, and the integrity is improved. Meanwhile, the two second side plates 14 can prevent excessive pressure relief on two sides, and the oil smoke absorbing effect is ensured.

Referring to fig. 11 and 12, the range hood is in a closed state, in which the damper 13 closes the air inlet 21, and the smoke baffle 12 is in a substantially vertically extended state.

Referring to fig. 15 and 16, the range hood is opened, the second driving mechanism 43 is started to drive the baffle 13 to slide forward, gradually opening the air inlet 21, and simultaneously the smoke baffle 12 is turned forward.

Referring to fig. 17 and 18, the baffle 13 slides forward to a limit position, that is, the rear end of the baffle 13 is flush with the front edge of the air inlet 21, and at this time, the front surfaces of the smoke baffle 12 and the back plate 111 form a smoke collecting cavity Q, and the smoke passes through the air inlet 21 from the rear side of the smoke baffle 12 and enters the upper case 2.

The form also makes the air inlet assembly 1 not need to form an air inlet channel, and the smoke baffle 12 can be tightly attached to the back plate 111 when the air inlet assembly 1 is closed, so that the whole thickness of the air inlet assembly 1 is extremely thin and light, and is preferably about tens of millimeters.

Example five

Referring to fig. 19 and 20, in the present embodiment, the difference from the fourth embodiment is that the second driving mechanism 43 adopts an electric push rod, and the output end thereof is in driving connection with the second rail 4432 to drive the second rail 4432 to slide back and forth. To avoid interference with the rail assembly 443, the electric push rod is angled horizontally and the output end is rotatably coupled to the second rail 4432.

Other conventional linear driving modules can be used for replacing the motor gear rack in the fourth embodiment and the electric push rod in the fifth embodiment, such as a motor screw nut combination, a motor multi-connecting rod combination and the like.

Claims (19)

1. The utility model provides a range hood, includes air inlet subassembly (1) and is used for setting up last box (2) of fan system, the bottom of going up box (2) is equipped with air intake (21), its characterized in that: the air inlet assembly (1) comprises:

a lower case (11), the lower case (11) having a back plate (111) extending downward from the bottom of the upper case (2); and

the cigarette collecting plate comprises a baffle plate (13) and a cigarette blocking plate (12), wherein the length of the cigarette blocking plate (12) is L2, and the baffle plate (13) and the cigarette blocking plate (12) are in a closed state and an open state:

when the air inlet (21) is closed by the baffle plate (13), the smoke baffle plate (12) covers the front surface of the back plate (111), and the vertical distance between the lower edge of the smoke baffle plate (12) and the back plate (111) is d1;

when in an open state, the air inlet (21) is opened by the baffle plate (13), a smoke collecting cavity (Q) is formed between the smoke baffle plate (12) and the front surface of the back plate (111), the vertical distance between the lower edge of the smoke baffle plate (12) and the back plate (111) is d2, the included angle between the smoke baffle plate (12) and the back plate (111) is beta, and the following relation is satisfied: d2-L2 sin β > d1.

2. The range hood of claim 1, wherein: the value range of d2 satisfies the following relationship: d2 And the diameter is more than or equal to 400mm.

3. The range hood of claim 1, wherein: in the closed state, the smoke baffle (12) is parallel to the back plate (111).

4. A range hood according to claim 3, wherein: the depth dimension (h 1) of the air inlet (21) is larger than the thickness dimension (h 2) of the lower box body (11) corresponding to the back plate (111).

5. The range hood of claim 4, wherein: the thickness dimension (h 2) of the lower box body (11) corresponding to the back plate (111) is not more than 50mm.

6. The range hood of claim 1, wherein: one side of the lower box body (11) corresponding to the smoke collecting plate piece forms an inner concave part (114), and the inner concave part (114) forms a part of the smoke collecting cavity (Q).

7. The range hood of claim 1, wherein: the smoke baffle (12) is rotationally connected with the baffle (13).

8. The range hood of claim 7, wherein: when in an open state, the included angle of the baffle plate (13) relative to the back plate (111) is alpha, and beta is more than or equal to alpha.

9. The range hood of claim 8, wherein: the value of alpha is less than 55 degrees, less than 50 degrees or less than 45 degrees, and the value of beta is less than 55 degrees, less than 50 degrees or less than 45 degrees.

10. The range hood of claim 7, wherein: the length of the baffle (13) is L1, and when in an open state, the vertical distance d2=L1+L2+sLβ+d1 between the lower edge of the smoke baffle (12) and the back plate (111).

11. The range hood of claim 1, wherein: the length of the baffle (13) is L1, L1: the value range of L2 is 1:4-1:1.5.

12. The range hood of claim 7, wherein: the baffle (13) is rotatably connected with the upper box body (2) or the lower box body (11) at the front side or the position close to the front side of the air inlet (21), the upper end part of the smoke baffle (12) is connected with the free end of the baffle (13), and the free end of the baffle (13) covers the air inlet (21) when the baffle (13) closes the air inlet (21).

13. The range hood of claim 11, wherein: the range hood further comprises a first movement mechanism for driving the smoke baffle (12) and the baffle (13) to be linked, the first movement mechanism comprises a rotation driving module and a first connecting rod (421) driven to rotate by the rotation driving module, one end of the first connecting rod (421) is rotationally connected with the upper box body (2), and the other end of the first connecting rod (421) is fixed with the smoke baffle (12).

14. The range hood of claim 12, wherein: sliding grooves (131) are formed in the left side and the right side of the baffle (13), a rotating shaft (132) is arranged in the lower box body (11) or the upper box body (2), and the rotating shaft (132) is matched in the sliding grooves (131).

15. The range hood of claim 13, wherein: the lower box body (11) further comprises a first side plate (112) and a top plate (113), the top plate (113) is formed by extending the top end of the back plate (111) forwards, the width of the back plate (111) is larger than that of the upper box body (2), the top plate (113) is located at the left side and the right side of the upper box body (2), the first side plate (112) is arranged at the left side and the right side of the top plate (113) and the back plate (111), and the rotating shaft (132) is arranged on the first side plate (112).

16. The range hood of claim 1, wherein: the baffle (13) is arranged at the air inlet (21) and can move forwards and backwards.

17. The range hood of claim 16, wherein: the range hood further comprises a second movement mechanism for driving the smoke baffle (12) and the baffle (13) to be linked, the second movement mechanism comprises a linear driving module, a guide rail assembly (443) and a second connecting rod (444), the guide rail assembly (443) comprises a first guide rail (4431) fixed in the upper box body (2) and a second guide rail (4432) in sliding fit with the first guide rail (4431), the output end of the linear driving module is connected with the second guide rail (4432), the baffle (13) is connected and fixed with the second guide rail (4432) to move synchronously, and the second connecting rod (444) is rotationally connected with the second guide rail (4432) and fixed with the smoke baffle (12).

18. The range hood of claim 17, wherein: the second movement mechanism comprises a driving end and a driven end, the positions of the driving end and the driven end, which are connected with the smoke baffle (12) are arranged at intervals in the left-right direction, the positions of the driving end and the driven end, which are connected with the baffle (13), are arranged at intervals in the left-right direction, the driving end and the driven end both comprise the guide rail assembly (443) and the second connecting rod (444), and the driving end also comprises the linear driving module.

19. The range hood of claim 17, wherein: the second movement mechanism further comprises a third connecting rod (445), one end of the second connecting rod (444) is fixed with the upper end of the smoke baffle plate (12), the other end of the second connecting rod is rotatably connected with one end of the third connecting rod (445), and the other end of the third connecting rod (445) is rotatably arranged in the upper box body (2).