CN115247817A - Fume exhaust fan - Google Patents

Abstract

The invention discloses a range hood, which comprises a first box body and a second box body, wherein the first box body is used for mounting a fan assembly; the second box body is positioned below the first box body and can lift relative to the first box body, and the front side of the second box body is provided with an air inlet; it is characterized by also comprising: the third box body is arranged between the first box body and the second box body and is respectively matched with corresponding parts of the first box body and the second box body in a mode of moving up and down relatively for a limited distance; the driving assembly is fixed relative to the first box body and is used for driving the third box body to lift; the transmission assembly includes a link assembly having a folded state and an extended state and a transmission limiter disposed on the first case to limit over-folding or over-extension of the link assembly. The second box body and the third box body which are relatively telescopic can be connected, power transmitted and telescopic limited by only one set of transmission mechanism, the stability of the whole displacement of the second box body is ensured, the structure is simple, and therefore the manufacturing cost is greatly reduced and the operation reliability of the whole machine is improved.

Description

Fume exhaust fan

Technical Field

The invention relates to the technical field of kitchen equipment, in particular to a range hood.

Background

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

The existing range hood is installed on a certain fixed height on a wall. Once the kitchen ventilator is installed and fixed, the kitchen ventilator cannot be changed, and if the kitchen ventilator is installed too high, oil smoke generated during cooking cannot be fully discharged outdoors, so that serious pollution is brought to a kitchen, and meanwhile, the kitchen ventilator causes harm to the health of workers in the kitchen; this can be an obstacle for the staff in the kitchen if the installation is too low. And the height of workers in a kitchen is different, so that certain requirements are also met on the installation height of the range hood.

Because the range hood is higher in installation position (about 70cm away from a cooking bench), a part of gas inevitably escapes in the process of oil smoke rising, and the oil smoke is inhaled by people from the mouth and the nose to influence the respiratory tract health; meanwhile, as the oil fume can not be completely sucked out, if the oil fume is not cleaned in time, a part of the waste oil attached to the surface of the filter screen of the range hood is easy to generate the dripping phenomenon, and even the oil fume carelessly falls into a cooking utensil to cause secondary pollution to food.

Chinese utility model patent application "a can automatic two-stage lift dive range hood" as publication number CN211854122U (application number is 201922483112.8), wherein disclose spiral case and duct system, spiral case and duct system include nowel and last case, the inner chamber of nowel and last case is to the intercommunication, and the bottom fixed connection of nowel top and last case, fixedly connected with push rod motor on the backplate of last incasement chamber, the bottom mounting of push rod motor is on the backplate of nowel inner chamber, the output fixedly connected with of push rod motor goes up the drop frame subassembly down, the positive sliding connection of going up the drop frame subassembly has the ascending drop frame subassembly. This but dive lampblack absorber of automatic two-stage lift, the relative wall of lower box (equal to first box) among the air duct system is fixed, the push rod motor is fixed on the lower box, drive the telescopic link on it through the push rod motor, and through the cooperation of last lift frame slide rail and lower lift frame slide rail, make ascending and descending frame subassembly and lower lift frame subassembly (equal to the second box) reciprocate, and then make lower lift frame subassembly be close to the top of a kitchen range more, the lift of two-stage has been realized, the utility model discloses well lift frame subassembly reciprocates under the push rod motor direct drive, the motion journey length of lower lift frame subassembly is long, the stationarity of the whole stroke of lower lift frame subassembly can not be protected, it only lies in that lower lift frame group and ascending and descending frame subassembly can fold to set up its effect of ascending and descending frame subassembly, the length that the extension lower lift frame subassembly stretches out the lower box or retracts into the lower box more concealingly, but can's flexible unable spacing to the lower lift frame subassembly is carried out to the stove excessively promptly, other parts that collide or the lower box is collided, unreliable.

Disclosure of Invention

The invention aims to solve the first technical problem of providing a lifting range hood which can simultaneously provide mutual connection, power transmission and telescopic limit for two relatively telescopic box bodies by using one set of transmission mechanism.

The second technical problem to be solved by the invention is to provide a range hood with adjustable up-down relative movement speed of two relatively telescopic box bodies.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a range hood, comprising:

the first box body is used for installing a fan assembly;

the second box body is positioned below the first box body and can lift relative to the first box body, and the front side of the second box body is provided with an air inlet;

it is characterized by also comprising:

the third box body is arranged between the first box body and the second box body, at least the lower part of the first box body and the upper part of the second box body are accommodated in the third box body, and the third box body is respectively matched with the corresponding parts of the first box body and the second box body in a mode of relatively moving up and down for a limited distance; the inner cavities of the third box body, the first box body and the second box body are in fluid communication;

the driving assembly is fixed relative to the first box body and used for driving the third box body to lift;

the transmission assembly comprises a connecting rod assembly with a folding state and an extending state and a transmission limiting part arranged on the first box body, the connecting rod assembly is used for connecting the second box body and the third box body in a transmission mode, and the transmission limiting part acts on the power tail end of the connecting rod assembly to limit the excessive folding or the excessive extending of the connecting rod assembly.

For realizing that link assembly follows vertical folding and opening to it is flexible to realize the relative third box of second box, as preferred, link assembly includes:

the lower ends of the two parallel first connecting rods are rotatably connected to the second box body;

the upper ends of the two parallel second connecting rods are rotatably connected to the third box body, and the lower ends of the two parallel second connecting rods are rotatably connected with the upper ends of the first connecting rods on the corresponding side;

two ends of the connecting rod are respectively and rotatably connected with the upper ends of the two first connecting rods;

the upper end of one of the second connecting rods is used as the power tail end of the connecting rod assembly.

The transmission limiting part has various design forms, preferably, the transmission limiting part is in a block shape, is fixed relative to the first box body and acts on the power tail end of the connecting rod component through a transmission rod;

this lower extreme of conduction pole with the upper end fixed connection of second connecting rod, the upper end of conduction pole be the free end and with the bottom surface of transmission restriction spare offsets and can the relative movement to restriction link assembly's excessive folding, so, at the relative third box of second box removal in-process, when the bottom surface of transmission restriction spare was received to the conduction pole, the transmission restriction spare acted on the upper end of conduction pole and removed and fold and extend link assembly along the bottom surface of transmission restriction spare, the second box stretches out or retracts into in the third box.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the bottom surface of transmission restriction spare includes the plane of basic level and the inclined plane of from bottom to top tilt up, the upper end of conduction pole moves the inclined plane along the plane and rotates the folding with the second connecting rod relative first connecting rod, moves the plane along the inclined plane and rotates the extension with the second connecting rod relative first connecting rod, so, the moving speed of conduction pole along transmission restriction spare bottom surface slows down gradually, and the speed slows down from fast when the second box is withdrawing to the third box, can effectively prevent unexpected emergence such as tong. On the contrary, the speed that the second box stretches out of the third box slows down from fast, stretches out the third box earlier and smokes, avoids the second box to stretch out for a long time, influences range hood's work efficiency.

In order to facilitate the smooth deceleration or acceleration of the second box when the second box retracts or extends out of the third box, the plane and the inclined plane are preferably transited through an arc-shaped surface with gradually increasing slope.

Preferably, the upper end of the conduction rod is rotatably connected with a roller in order to facilitate the smooth movement of the conduction rod along the bottom surface of the transmission limiting part.

Another technical solution adopted by the present invention to solve the second technical problem is: the transmission limiting part is in a rod shape, the upper end of the transmission limiting part is rotatably connected to the first box body, the lower end of the transmission limiting part is rotatably connected with the upper end of a transmission rod, the lower end of the transmission rod is fixedly connected with the upper end of a second connecting rod which is used as the power tail end of the connecting rod assembly, and therefore the excessive folding or excessive extension of the connecting rod assembly is limited. When the second box body is nearly fully extended, the speed reduction speed can effectively reduce the collision with the cooker, and the speed is relatively high in the middle movement process, so that the high efficiency of opening and closing the range hood can be ensured.

In order to realize the motion constraint of the second box body and the third box body, preferably, the motion mechanism further comprises a first slide rail assembly and a second slide rail assembly, the first slide rail assembly comprises a first slide rail arranged on the first box body, a first slide block arranged on the third box body, and the first slide block is lifted along the first slide rail; the second slide rail assembly comprises a second slide rail arranged on the third box body and a second slide block arranged on the second box body, and the second slide block ascends and descends along the second slide rail.

Preferably, a smoke baffle plate is arranged on the front side wall of the third box body.

Compared with the prior art, the invention has the advantages that: through setting up the second box and the third box that the separation set up, the third box respectively with the corresponding position of first box and second box in order can relative movement from top to bottom, drive assembly realizes that the third box goes up and down relative to first box, shorten the motion stroke of the relative first box of second box and realize that the second box is flexible, and just only can give the relative flexible second box with one set of drive mechanism simultaneously, the third box provides connection each other, power transmission and flexible spacing, guarantee the stability and the simple structure of the whole aversion of second box, thereby make the reduction by a wide margin of manufacturing cost and the improvement of complete machine operational reliability.

Drawings

FIG. 1 is a sectional view of example 1 of the present invention (a state where the second casing is completely extended from the third casing).

Fig. 2 is an enlarged view at I in fig. 1.

FIG. 3 is a sectional view showing embodiment 1 of the present invention (a state where the second casing portion is retracted into the third casing).

FIG. 4 is a sectional view showing example 1 of the present invention (a state where the second casing is completely retracted into the third casing).

FIG. 5 is a sectional view of example 1 of the present invention (a state where the second casing is completely extended out of the third casing).

Fig. 6 is a schematic structural view of embodiment 1 of the present invention (a state where the second casing is completely extended from the third casing).

Fig. 7 is a schematic structural view of embodiment 1 of the present invention (a state in which the second casing is completely retracted into the third casing).

Fig. 8 is a schematic structural view of embodiment 2 of the present invention (a state where the second casing is completely extended out of the third casing).

Fig. 9 is a schematic structural view of embodiment 2 of the present invention (a state where the second casing portion is retracted into the third casing).

Fig. 10 is a schematic structural view of embodiment 2 of the present invention (a state in which the second casing is completely retracted into the third casing).

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to 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," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration only and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 7, a range hood according to a preferred embodiment of the present invention is shown, and the range hood includes a first box 1 for mounting a fan assembly, a second box 2 located below the first box 1, a third box 3 disposed between the first box 1 and the second box 2, and a moving mechanism.

An air inlet 21 is formed in the front side of the second box body 2, and the third box body 3 at least contains the lower part of the first box body 1 and the upper part of the second box body 2 and is respectively matched with the corresponding parts of the first box body 1 and the second box body 2 in a mode of relatively moving up and down for a limited distance; the inner chamber of third box 3, first box 1, 2 three of second box is the fluid intercommunication that flow equalizes, and the cigarette board 31 of 3 front sides of third box, in this embodiment, the cigarette board 31 setting is in the bottom of third box 3 to obtain better cigarette effect of holding together.

Referring to fig. 5, the movement mechanism includes a driving assembly 4 for driving the third casing 3 to ascend and descend, and the driving assembly 4 includes a driving device 41, a lead screw 42, and a moving block 43 disposed on the first casing 1. The driving device 4 is arranged at the top of the first box body 1, the lead screw 42 is arranged along the longitudinal direction and is driven by the driving device 41 to rotate around the axis of the lead screw, the moving block 43 is in threaded connection with the lead screw 42 and moves along the length direction of the lead screw 42 along with the rotation of the lead screw 42, and the moving block 43 serves as an output end and is connected with the third box body 3.

Referring to fig. 1, 3 and 4, the motion mechanism further includes a connecting rod assembly 51, and the connecting rod assembly 51 includes two parallel first connecting rods 511, two parallel second connecting rods 512 and a connecting rod 514. Two parallel first connecting rods 511 are arranged at intervals along the left-right direction, and the lower ends of the first connecting rods 511 are rotatably connected to the second box body 2; two parallel second connecting rods 512 are arranged at intervals along the left-right direction, the upper ends of the second connecting rods 512 are rotatably connected to the third box body 3, and the lower ends of the second connecting rods 512 are rotatably connected with the upper ends of the first connecting rods 511 on the corresponding side; two ends of the connecting rod 514 are respectively rotatably connected with the upper ends of the two first connecting rods 511, and the upper end of one of the second connecting rods 512 is used as the power terminal of the connecting rod assembly 51.

As shown in fig. 1 to 4, the movement mechanism further includes a transmission restriction member 53a having a block shape and acting on the power end of the link assembly 51 through the conductive rod 513. The transmission limiting member 53a is fixed on the inner side wall of the first case 1, the bottom surface of the transmission limiting member 53 comprises a substantially horizontal plane 532 and an inclined plane 531 inclined from bottom to top, and the plane 532 and the inclined plane 531 are transited by an arc-shaped surface 533 with gradually increasing slope. The lower end of the conducting rod 513 is fixedly connected with the upper end of the second connecting rod 512, the upper end of the conducting rod 513 is a free end, and the upper end of the conducting rod 513 is rotatably connected with a roller 5131.

Referring to fig. 1, 3 and 4, the movement mechanism further includes a first slide rail assembly and a second slide rail assembly, the first slide rail assembly includes a first slide rail 61 disposed on the outer side walls of the left and right sides of the first box 1 and a first slider 62 disposed on the inner side walls of the left and right sides of the third box 3, and the first slider 62 is lifted along the first slide rail 61; the second slide rail assembly comprises a second slide rail 71 arranged on the inner side walls of the left side and the right side of the third box body 3 and a second slide block 72 arranged on the outer side walls of the left side and the right side of the second box body 2, the second slide block 72 is lifted along the second slide rail 71, and the lifting of the second box body 2 is more stable.

Referring to fig. 1 and 6, when the range hood is in a working state, the second box 2 extends out of the third box 3. When the range hood is shut down, the driving assembly 4 drives the third box 3 to ascend, the third box 3 transmits power to the second box 2 through the conduction of the second connecting rod 512 and the first connecting rod 511, the second box 2 moves upwards, the speeds of the second box 2 and the third box 3 are basically consistent, when the roller 5131 abuts against the bottom surface of the transmission limiting part 53 (see fig. 3), the second connecting rod 512 rotates and folds relative to the first connecting rod 511, the transmission limiting part 53a limits the rotation amplitude of the second connecting rod 512, the roller 5131 sequentially moves along the plane 532, the arc-shaped surface 533 and the inclined surface 531, the second box 2 gradually retracts into the third box 3, when the roller passes through the arc-shaped surface 533 and the inclined surface 531, the ascending speed of the second box 2 gradually decelerates from a basically constant speed to a gradually speed, and the speed slows down at the finishing stage of retracting the second box 2 into the third box 3, and the danger of clamping hands and the like can be effectively reduced. When the range hood is started, the driving assembly 4 drives the third box 3 to descend, the third box 3 transmits power to the second box 2 through the conduction of the second connecting rod 512 and the first connecting rod 511, the second box 2 moves downwards, the roller 5131 sequentially moves along the inclined plane 531, the arc-shaped plane 533 and the plane 532 to open and extend the second connecting rod 512 in a rotating mode relative to the first connecting rod 511, the transmission limiting part 53a limits the rotating amplitude of the second connecting rod 512, the second box 2 gradually accelerates and extends out of the third box 3 first, the range hood is guaranteed to work, when the roller 5131 is separated from the transmission limiting part 53a, the speeds of the second box 2 and the third box 3 basically keep consistent and synchronously descend, and the second box 2 and the third box 3 basically move downwards at a constant speed until the third box reaches a working position.

Example 2

Referring to fig. 8 to 10, another preferred embodiment of the range hood of the present invention is shown, which is different from the embodiments in that: the transmission limiting member 53b is rod-shaped, and has an upper end rotatably connected to the first casing 1, a lower end rotatably connected to an upper end of a transmission rod 513, and a lower end of the transmission rod 513 fixedly connected to an upper end of a second connecting rod 512 serving as a power terminal of the connecting rod assembly 51.

Referring to fig. 8, when the range hood is in a working state, the second box 2 extends out of the third box 3. When the range hood is shut down, the driving assembly 4 drives the third box 3 to ascend, the third box 3 transmits power to the second box 2 through the conduction of the second connecting rod 512 and the first connecting rod 511, the second box 2 moves upwards, the transmission limiting part 53 acts on the transmission rod 513, the second connecting rod 512 rotates and folds relative to the first connecting rod 511, the second box 2 gradually retracts towards the third box 3, and limits the rotation amplitude of the second connecting rod 512, as shown in fig. 8, 9 and 10, the transmission limiting part 53 swings anticlockwise, the change of the included angle with the vertical direction changes the speed of the transmission limiting part 53 and the transmission rod 513 at the rotating connection point, the second box 2 has slower speed in the initial stage and the final stage of retraction, and has faster speed in the middle stage, so that the danger of clamping hands and the like can be effectively reduced. When the range hood is started, the driving component 4 drives the third box 3 to descend, the third box 3 transmits power to the second box 2 through the second connecting rod 512 and the conduction of the first connecting rod 511, the second box 2 moves downwards, the transmission limiting part 53 acts on the conducting rod 513, the second connecting rod 512 rotates and extends relative to the first connecting rod 511, the second box 2 gradually extends out of the third box 3 and limits the rotation amplitude of the second connecting rod 512, the transmission limiting part 53 swings clockwise and changes an included angle with the vertical direction, the speed of the transmission limiting part 53 and the conducting rod 513 at a rotation connecting point is changed, the second box 2 is slow in the initial stage and the final stage of extension, the speed is relatively fast in the middle stage, the collision between the transmission limiting part 53 and a cooker can be effectively reduced, and the speed is relatively fast in the middle stage, and the high efficiency of opening and closing the range hood can be ensured.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion or/and be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a conduit, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (10)

1. A range hood, comprising:

the first box body (1) is used for installing a fan assembly;

the second box body (2) is positioned below the first box body (1) and can lift relative to the first box body (1), and an air inlet (22) is formed in the front side of the second box body (2);

it is characterized by also comprising:

the third box body (3) is arranged between the first box body (1) and the second box body (2), at least the lower part of the first box body (1) and the upper part of the second box body (2) are accommodated in the third box body, and the third box body is respectively matched with the corresponding parts of the first box body (1) and the second box body (2) in a mode of moving up and down relatively for a limited distance; the inner cavities of the third box body (3), the first box body (1) and the second box body (2) are in fluid communication;

the driving assembly (4) is fixed relative to the first box body (1) and is used for driving the third box body (3) to lift;

the transmission assembly (5) comprises a connecting rod assembly (51) with a folding state and an extending state and a transmission limiting part arranged on the first box body (1), wherein the connecting rod assembly (51) is used for connecting the second box body (2) and the third box body (3) in a transmission mode, and the transmission limiting part acts on the power tail end of the connecting rod assembly (51) to limit the excessive folding or the excessive extending of the connecting rod assembly (51).

2. A range hood according to claim 1, wherein the connecting rod assembly (51) comprises:

the lower ends of the two parallel first connecting rods (511) are rotatably connected to the second box body (2);

the upper ends of the two parallel second connecting rods (512) are rotatably connected to the third box body (3), and the lower ends of the two parallel second connecting rods are rotatably connected with the upper ends of the first connecting rods (511) on the corresponding side;

the two ends of the connecting rod (514) are respectively and rotatably connected with the upper ends of the two first connecting rods (511);

the upper end of one of the second connecting rods (512) is used as the power end of the connecting rod assembly (51).

3. The range hood of claim 2, wherein: the transmission limiting part is in a block shape, is fixed relative to the first box body (1), and acts on the power tail end of the connecting rod component (51) through a conducting rod (513);

the lower end of the conduction rod (513) is fixedly connected with the upper end of the second connecting rod (512), and the upper end of the conduction rod (513) is a free end and is abutted against the bottom surface of the transmission limiting part and can move relatively, so that the excessive folding of the connecting rod assembly (51) is limited.

4. A range hood as claimed in claim 3, wherein: the bottom surface of the transmission limiting part comprises a substantially horizontal plane (532) and an inclined plane (531) inclined upwards from bottom to top, the upper end of the transmission rod (513) moves to the inclined plane (531) along the plane (532) to fold the second connecting rod (512) in a rotating mode relative to the first connecting rod (511), and moves to the plane (532) along the inclined plane (531) to extend the second connecting rod (512) in a rotating mode relative to the first connecting rod (511).

5. The range hood of claim 4, wherein: the plane (532) and the inclined plane (531) are transited through an arc-shaped surface (533) with gradually increasing slope.

6. The range hood according to any one of claims 2 to 5, wherein: the upper end of the conduction rod (513) is rotatably connected with a roller (5131).

7. The range hood of claim 2, wherein: the transmission limiting part is in a rod shape, the upper end of the transmission limiting part is rotatably connected to the first box body (1), the lower end of the transmission limiting part is rotatably connected with the upper end of a transmission rod (513), and the lower end of the transmission rod (513) is fixedly connected with the upper end of a second connecting rod (512) which is the power tail end of the connecting rod component (51), so that the excessive folding or the excessive extension of the connecting rod component (51) is limited.

8. The extractor hood according to claim 1, characterized in that said drive assembly (4) comprises:

a drive device (41) provided on the first case (1);

the screw rod (42) is arranged along the longitudinal direction and is driven by the driving device (41) to rotate around the axis of the screw rod;

and the moving block (43) is arranged on the screw rod (42) and moves along the length direction of the screw rod (42) along with the rotation of the screw rod (42), and the moving block (43) is connected with the third box body (3).

9. The range hood according to claim 1, wherein the moving mechanism further comprises a first slide rail assembly and a second slide rail assembly, the first slide rail assembly comprises a first slide rail (61) arranged on the first box (1) and a first sliding block (62) arranged on the third box (3), and the first sliding block (62) is lifted along the first slide rail (61); the second slide rail assembly comprises a second slide rail (71) arranged on the second box body (2) and a second slide block (72) arranged on the third box body (3), and the second slide block (72) is lifted along the second slide rail (71).

10. The range hood according to claim 1, wherein a smoke baffle (31) is disposed on the front side wall of the third box (3).

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