A range hood

Abstract

The invention discloses a range hood, comprising a first housing and a second housing, wherein the first housing is used to install a fan assembly; the second housing is located below the first housing and can be lifted relative to the first housing, and the front side of the second housing has an air inlet; the invention is characterized in that it also comprises: a third housing, a driving assembly and a transmission assembly, wherein the third housing is arranged between the first housing and the second housing, and is respectively matched with corresponding parts of the first housing and the second housing in a manner that the third housing can move up and down a limited distance relative to the first housing; the driving assembly is fixed relative to the first housing and is used to drive the third housing to lift; the transmission assembly comprises a connecting rod assembly having a folded state and an extended state and a transmission limiting member arranged on the first housing to limit excessive folding or excessive extension of the connecting rod assembly. Only one set of transmission mechanism can simultaneously provide mutual connection, power transmission and telescopic limit for the relatively telescopic second housing and the third housing, thereby ensuring the stability of the overall displacement of the second housing and having a simple structure, thereby greatly reducing the manufacturing cost and improving the operating reliability of the whole machine.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen equipment, in particular to a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil fumes, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil fumes under the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and guided to be discharged outdoors.

[0003] At present, the range hoods are installed at a fixed height on the wall. Once installed, it cannot be changed. If it is installed too high, the fumes generated during cooking cannot be fully discharged to the outside, which will cause serious pollution to the kitchen and harm the health of the kitchen staff; if it is installed too low, it will hinder the work of the kitchen staff. Another point is that due to the different heights of kitchen staff, there are certain requirements for the installation height of the range hood.

[0004] Because the range hood is installed at a high position (about 70 cm away from the stove), some of the gas will inevitably escape during the rising process of the oil fume and be inhaled by people through the mouth and nose, affecting respiratory health; at the same time, since the oil fume cannot be completely sucked out, if it is not cleaned in time, some of the waste oil attached to the surface of the range hood filter is prone to dripping, and may even accidentally fall into the cooking utensils, causing secondary contamination of the food.

[0005] For example, the Chinese utility model patent application "A submersible range hood capable of automatic two-stage lifting" with publication number CN211854122U (application number 201922483112.8) discloses a volute and an air duct system, which includes a lower box and an upper box. The inner cavities of the lower box and the upper box are connected, and the top of the lower box and the bottom of the upper box are fixedly connected. A push rod motor is fixedly connected to the back plate of the inner cavity of the upper box, and the bottom end of the push rod motor is fixed to the back plate of the inner cavity of the lower box. The output end of the push rod motor is fixedly connected to a lower lifting frame assembly, and the front side of the lower lifting frame assembly is slidably connected to the upper lifting frame assembly. The lift is then moved up and down by the push rod motor, and the lift is moved up and down by the push rod motor, so that the lift is moved up and down, and the lift is moved down and down ... down and down, and the lift is moved down and down, so that the lift is moved down and down, and the lift is moved down and down, so that the lift is moved down and down, and the lift is moved down and down, so that the lift is moved down and down, and the lift is moved down and down, so that the lift is moved down and Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a liftable range hood which can simultaneously provide mutual connection, power transmission and telescopic limitation for two relatively telescopic boxes with only one set of transmission mechanism.

[0007] The second technical problem to be solved by the present invention is to provide a range hood with two relatively telescopic boxes whose vertical relative moving speed can be adjusted.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: a range hood, comprising:

[0009] The first box is used to install the fan assembly;

[0010] The second box is located below the first box and can be raised and lowered relative to the first box. The front side of the second box has an air inlet.

[0011] It is characterized by further comprising:

[0012] The third box is arranged between the first box and the second box, at least accommodating the lower part of the first box and the upper part of the second box, and respectively cooperating with the corresponding parts of the first box and the second box in a manner that they can move up and down relatively by a limited distance; the inner cavities of the third box, the first box and the second box are all fluidically connected;

[0013] A driving assembly, fixed relative to the first box body, and used to drive the third box body to rise and fall;

[0014] The transmission assembly includes a connecting rod assembly having a folded state and an extended state and a transmission limiting member arranged on the first box body. The connecting rod assembly connects the second box body and the third box body together in a transmission manner. The transmission limiting member acts on the power end of the connecting rod assembly to limit excessive folding or excessive extension of the connecting rod assembly.

[0015] In order to realize the folding and opening of the connecting rod assembly in the vertical direction, thereby realizing the telescopic movement of the second box body relative to the third box body, preferably, the connecting rod assembly includes:

[0016] Two parallel first connecting rods, the lower ends of which are rotatably connected to the second box body;

[0017] Two parallel second connecting rods, the upper ends of which are rotatably connected to the third box body, and the lower ends of which are rotatably connected to the upper ends of the first connecting rods on the corresponding sides;

[0018] A connecting rod, both ends of which are rotatably connected to the upper ends of the two first connecting rods;

[0019] The upper end of one of the second connecting rods serves as the power end of the connecting rod assembly.

[0020] There are many designs of the transmission limiting member. Preferably, the transmission limiting member is block-shaped and fixed relative to the first housing, and acts on the power end of the connecting rod assembly through a transmission rod.

[0021] The lower end of the transmission rod is fixedly connected to the upper end of the second connecting rod, and the upper end of the transmission rod is a free end and abuts against the bottom surface of the transmission limiting member and can move relatively, thereby limiting excessive folding of the connecting rod assembly. In this way, during the movement of the second box body relative to the third box body, when the transmission rod abuts against the bottom surface of the transmission limiting member, the transmission limiting member acts on the upper end of the transmission rod to move along the bottom surface of the transmission limiting member to fold and stretch the connecting rod assembly, and the second box body extends or retracts into the third box body.

[0022] The technical solution adopted by the present invention to solve the second technical problem is as follows: the bottom surface of the transmission limiting member includes a substantially horizontal plane and an inclined plane that tilts upward from bottom to top, the upper end of the transmission rod moves along the plane to the inclined plane to rotate and fold the second connecting rod relative to the first connecting rod, and moves along the inclined plane to the plane to rotate and extend the second connecting rod relative to the first connecting rod, so that the movement speed of the transmission rod along the bottom surface of the transmission limiting member gradually slows down, and the speed of the second box body decreases from fast to slow when it retracts to the third box body, which can effectively prevent accidents such as pinching of the hand. On the contrary, the speed of the second box body extending from the third box body decreases from fast to slow, and the third box body is extended first for smoking, so as to avoid the second box body extending for a long time and affecting the working efficiency of the range hood.

[0023] In order to facilitate smooth deceleration or acceleration when the second box body is retracted into or extended into the third box body, preferably, the plane and the inclined surface are transitioned through an arc-shaped surface with a gradually increasing slope.

[0024] In order to facilitate smoother movement of the conduction rod along the bottom surface of the transmission limiting member, preferably, a roller is rotatably connected to the upper end of the conduction rod.

[0025] Another technical solution adopted by the present invention to solve the second technical problem is: the transmission limiting member is in the shape of a rod and its upper end is rotatably connected to the first box, and its lower end is rotatably connected to the upper end of a transmission rod, and the lower end of the transmission rod is fixedly connected to the upper end of the second connecting rod as the power end of the connecting rod assembly, so as to limit the excessive folding or transitional extension of the connecting rod assembly. In this way, the speed of the third box transmitted to the second box through the connecting rod assembly is basically synchronized with the third box. The vertical distance between the transmission limiting member and the rotation connection point of the transmission limiting member and the first box can be changed by changing the angle between the transmission limiting member and the vertical direction, and the moving speed of the second box relative to the third box can be changed. The relative speed between the second box and the third box can be reduced before the second box is fully extended or fully retracted, that is, the speed is reduced before the third box is fully retracted, which can effectively reduce the occurrence of dangers such as pinching hands. When the second box is close to being fully extended, slowing down the speed can effectively reduce the collision with the cooker, and the speed is relatively fast during the intermediate movement, which can ensure the high efficiency of opening and closing the range hood.

[0026] In order to realize the motion constraint of the second box body and the third box body, preferably, the motion mechanism also includes a first slide rail assembly and a second slide rail assembly, the first slide rail assembly includes a first slide rail arranged on the first box body and a first slider arranged on the third box body, and the first slider is lifted and lowered along the first slide rail; the second slide rail assembly includes a second slide rail arranged on the third box body and a second slider arranged on the second box body, and the second slider is lifted and lowered along the second slide rail.

[0027] Preferably, a smoke baffle is provided on the front side wall of the third box body.

[0028] Compared with the prior art, the advantages of the present invention are: by setting up a second box body and a third box body that are separately arranged, the third box body can move up and down relative to the corresponding parts of the first box body and the second box body respectively, and the driving component can realize the lifting and lowering of the third box body relative to the first box body, shortening the movement stroke of the second box body relative to the first box body to realize the extension and retraction of the second box body, and only one set of transmission mechanism can simultaneously provide mutual connection, power transmission and extension and retraction limit for the relatively retractable second box body and the third box body, thereby ensuring the stability of the overall displacement of the second box body and the simple structure, thereby greatly reducing the manufacturing cost and improving the operating reliability of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of Embodiment 1 of the present invention (the second housing is fully extended out of the third housing).

[0030] Figure 2 for Figure 1 Enlarged view of point I in the middle.

[0031] Figure 3 It is a cross-sectional view of Embodiment 1 of the present invention (the state where the second housing is partially retracted into the third housing).

[0032] Figure 4 It is a cross-sectional view of Embodiment 1 of the present invention (the second housing is completely retracted into the third housing).

[0033] Figure 5 It is a cross-sectional view of Embodiment 1 of the present invention (the second housing is fully extended out of the third housing).

[0034] Figure 6 It is a schematic diagram of the structure of Embodiment 1 of the present invention (the second box body is fully extended out of the third box body).

[0035] Figure 7 It is a schematic diagram of the structure of Embodiment 1 of the present invention (the second box is completely retracted into the third box).

[0036] Figure 8 It is a schematic diagram of the structure of Embodiment 2 of the present invention (the second box body is fully extended out of the third box body).

[0037] Fig. 9 It is a schematic diagram of the structure of Embodiment 2 of the present invention (the second box body is partially retracted into the third box body).

[0038] Fig.10 It is a schematic diagram of the structure of Embodiment 2 of the present invention (the second box is completely retracted into the third box). DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] See also Figures 1 to 7 A preferred embodiment of the range hood of the present invention is shown, which includes a first box body 1 for installing a fan assembly, a second box body 2 located below the first box body 1, a third box body 3 arranged between the first box body 1 and the second box body 2, and a moving mechanism.

[0042] An air inlet 21 is provided on the front side of the second box body 2, and the third box body 3 at least accommodates the lower part of the first box body 1 and the upper part of the second box body 2, and cooperates with the corresponding parts of the first box body 1 and the second box body 2 respectively in a manner that they can move up and down relative to each other by a limited distance; the inner cavities of the third box body 3, the first box body 1, and the second box body 2 are all fluidically connected, and the smoke baffle 31 on the front side of the third box body 3, in this embodiment, is arranged at the bottom of the third box body 3 to obtain a better smoke collection effect.

[0043] See also Figure 5 As shown, the motion mechanism includes a driving assembly 4 for driving the third box 3 to rise and fall, and the driving assembly 4 includes a driving device 41, a screw rod 42 and a moving block 43 arranged on the first box 1. The driving device 4 is arranged on the top of the first box 1, and the screw rod 42 is arranged in the longitudinal direction and is driven by the driving device 41 to rotate around its own axis. The moving block 43 is threadedly connected with the screw rod 42 and moves along the length direction of the screw rod 42 as the screw rod 42 rotates. The moving block 43 serves as an output end and is connected to the third box 3.

[0044] See also Figure 1 , Figure 3 , Figure 4As shown, the motion mechanism further includes a connecting rod assembly 51, which includes two parallel first connecting rods 511, two parallel second connecting rods 512 and a connecting rod 514. The two parallel first connecting rods 511 are arranged at intervals in the left-right direction, and the lower ends of the first connecting rods 511 are rotatably connected to the second box body 2; the two parallel second connecting rods 512 are arranged at intervals in the left-right direction, and the upper ends of the second connecting rods 512 are rotatably connected to the third box body 3, and the lower ends are rotatably connected to the upper ends of the first connecting rods 511 on the corresponding side; the two ends of the connecting rod 514 are rotatably connected to the upper ends of the two first connecting rods 511, respectively, and the upper end of one of the second connecting rods 512 serves as the power end of the connecting rod assembly 51.

[0045] See also Figures 1 to 4 As shown, the motion mechanism also includes a transmission limiting member 53a, which is block-shaped and acts on the power end of the connecting rod assembly 51 through a transmission rod 513. The transmission limiting member 53a is fixed on the inner side wall of the first box body 1, and the bottom surface of the transmission limiting member 53 includes a substantially horizontal plane 532 and an inclined surface 531 that tilts upward from bottom to top, and the plane 532 and the inclined surface 531 are transitioned by an arc surface 533 with a gradually increasing slope. The lower end of the transmission rod 513 is fixedly connected to the upper end of the second connecting rod 512, and the upper end of the transmission rod 513 is a free end, and the upper end of the transmission rod 513 is rotatably connected to a roller 5131.

[0046] See also Figure 1 , Figure 3 , Figure 4 As shown, the motion mechanism also includes a first slide rail assembly and a second slide rail assembly. The first slide rail assembly includes a first slide rail 61 arranged on the outer side walls on the left and right sides of the first box body 1 and a first slider 62 arranged on the inner side walls on the left and right sides of the third box body 3. The first slider 62 is lifted and lowered along the first slide rail 61; the second slide rail assembly includes a second slide rail 71 arranged on the inner side walls on the left and right sides of the third box body 3 and a second slider 72 arranged on the outer side walls on the left and right sides of the second box body 2. The second slider 72 is lifted and lowered along the second slide rail 71, and the lifting of the second box body 2 is more stable.

[0047] See also Figure 1 , Figure 6 As shown, when the range hood is in working state, the second housing 2 extends out of the third housing 3. When the range hood is turned off, the driving assembly 4 drives the third housing 3 to rise, and the third housing 3 transmits power to the second housing 2 through the conduction of the second connecting rod 512 and the first connecting rod 511, and the second housing 2 moves upward. The speeds of the second housing 2 and the third housing 3 are basically consistent. When the roller 5131 abuts against the bottom surface of the transmission limiter 53 (see Figure 3As shown in the figure, the second connecting rod 512 is rotated and folded relative to the first connecting rod 511, and the transmission limiting member 53a limits the rotation range of the second connecting rod 512. The roller 5131 moves along the plane 532, the arc surface 533, and the inclined surface 531 in sequence, and the second box body 2 gradually retracts into the third box body 3. When passing through the arc surface 533 and the inclined surface 531, the rising speed of the second box body 2 changes from basically uniform to gradually decelerating. At the end stage of the retraction of the second box body 2 into the third box body 3, the speed slows down, which can effectively reduce the occurrence of risks such as pinching hands. When the range hood is turned on, the driving assembly 4 drives the third box body 3 to descend, and the third box body 3 transmits power to the second box body 2 through the conduction of the second connecting rod 512 and the first connecting rod 511. The second box body 2 moves downward, and the roller 5131 moves along the inclined surface 531, the curved surface 533, and the plane 532 in sequence, and the second connecting rod 512 is rotated relative to the first connecting rod 511 to open and extend. The transmission limiting member 53a also limits the rotation range of the second connecting rod 512, and the second box body 2 gradually accelerates and extends out of the third box body 3 first to ensure the operation of the range hood. When the roller 5131 disengages from the transmission limiting member 53a, the speeds of the second box body 2 and the third box body 3 are basically consistent and descend synchronously, and move downward at a basically uniform speed until they reach the working position.

[0048] Example 2

[0049] See also Figures 8 to 10 Another preferred embodiment of the range hood of the present invention is shown, which is different from the embodiment in that: the transmission limiting member 53b is in the shape of a rod, the upper end of which is rotatably connected to the first box body 1, and the lower end of which is rotatably connected to the upper end of a transmission rod 513, and the lower end of the transmission rod 513 is fixedly connected to the upper end of the second connecting rod 512 serving as the power end of the connecting rod assembly 51.

[0050] See also Figure 8 As shown, when the range hood is in working state, the second housing 2 extends out of the third housing 3. When the range hood is turned off, the driving assembly 4 drives the third housing 3 to rise, and the third housing 3 transmits power to the second housing 2 through the conduction of the second connecting rod 512 and the first connecting rod 511, and the second housing 2 moves upward. The transmission limiting member 53 acts on the transmission rod 513 to rotate and fold the second connecting rod 512 relative to the first connecting rod 511, and the second housing 2 gradually retracts toward the third housing 3, and limits the rotation range of the second connecting rod 512, see Figure 8 , Fig. 9 , Fig.10As shown, the transmission limiting member 53 swings counterclockwise, and the change in the angle with the vertical direction changes the speed of the transmission limiting member 53 and the conduction rod 513 at the rotation connection point. The speed of the second box body 2 is slow in the initial and final stages of retraction, and is relatively fast in the middle stage, which can effectively reduce the occurrence of dangers such as pinching hands. When the range hood is turned on, the driving assembly 4 drives the third box body 3 to descend, and the third box body 3 transmits power to the second box body 2 through the conduction of the second connecting rod 512 and the first connecting rod 511. The second box body 2 moves downward, and the transmission limiting member 53 acts on the conduction rod 513 to rotate and extend the second connecting rod 512 relative to the first connecting rod 511. The second box body 2 gradually extends from the third box body 3 and limits the rotation amplitude of the second connecting rod 512. The transmission limiting member 53 swings clockwise, and the angle with the vertical direction changes, thereby changing the speed of the transmission limiting member 53 and the conduction rod 513 at the rotation connection point. The speed of the second box body 2 is slow in the initial stage and the end stage of extension, and is relatively fast in the middle stage. Slowing down the speed can effectively reduce the collision with the cooker, and the speed in the middle stage is relatively fast, which can ensure the high efficiency of opening and closing the range hood.

[0051] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising: A first box (1) is used to install a fan assembly; The second box body (2) is located below the first box body (1) and can be raised and lowered relative to the first box body (1), and the front side of the second box body (2) is provided with an air inlet (22); It is characterized by further comprising: The third box (3) is arranged between the first box (1) and the second box (2), and at least accommodates the lower part of the first box (1) and the upper part of the second box (2), and cooperates with the corresponding parts of the first box (1) and the second box (2) in a manner that they can move up and down relative to each other by a limited distance; the inner cavities of the third box (3), the first box (1) and the second box (2) are all fluidically connected; A driving assembly (4) is fixed relative to the first box body (1) and is used to drive the third box body (3) to rise and fall; A transmission assembly (5) comprises a connecting rod assembly (51) having a folded state and an extended state and a transmission limiting member arranged on the first box body (1), wherein the connecting rod assembly (51) connects the second box body (2) and the third box body (3) together by transmission, and the transmission limiting member acts on the power end of the connecting rod assembly (51) to limit excessive folding or excessive extension of the connecting rod assembly (51); The connecting rod assembly (51) comprises: Two parallel first connecting rods (511), the lower ends of which are rotatably connected to the second box body (2); Two parallel second connecting rods (512), the upper ends of which are rotatably connected to the third box body (3), and the lower ends of which are rotatably connected to the upper ends of the first connecting rods (511) on the corresponding sides; A connecting rod (514), both ends of which are rotatably connected to the upper ends of the two first connecting rods (511); The upper end of one of the second connecting rods (512) serves as the power end of the connecting rod assembly (51).

2. The range hood according to claim 1, characterized in that: The transmission limiting member is block-shaped and fixed relative to the first housing (1), and acts on the power end of the connecting rod assembly (51) through a transmission rod (513); The lower end of the transmission rod (513) is fixedly connected to the upper end of the second connecting rod (512), and the upper end of the transmission rod (513) is a free end and abuts against the bottom surface of the transmission limiting member and can move relatively, thereby limiting excessive folding of the connecting rod assembly (51).

3. The range hood according to claim 2, characterized in that: The bottom surface of the transmission limiting member includes a basically horizontal plane (532) and an inclined plane (531) inclined upward from bottom to top. The upper end of the transmission rod (513) moves along the plane (532) to the inclined plane (531) to rotate and fold the second connecting rod (512) relative to the first connecting rod (511), and moves along the inclined plane (531) to the plane (532) to rotate and extend the second connecting rod (512) relative to the first connecting rod (511).

4. The range hood according to claim 3, characterized in that: The plane (532) and the inclined surface (531) are transitioned via an arcuate surface (533) with a gradually increasing slope.

5. The range hood according to any one of claims 2 to 4, characterized in that: The upper end of the conduction rod (513) is rotatably connected to a roller (5131).

6. The range hood according to claim 1, characterized in that: The transmission limiting member is in the shape of a rod and its upper end is rotatably connected to the first box body (1), and its lower end is rotatably connected to the upper end of a transmission rod (513). The lower end of the transmission rod (513) is fixedly connected to the upper end of the second connecting rod (512) serving as the power end of the connecting rod assembly (51), thereby limiting excessive folding or excessive extension of the connecting rod assembly (51).

7. The range hood according to claim 1, characterized in that: The driving assembly (4) comprises: A driving device (41) is arranged on the first housing (1); The screw rod (42) is arranged in the longitudinal direction and is driven by the driving device (41) to rotate around its own axis; The moving block (43) is arranged on the screw rod (42) and moves along the length direction of the screw rod (42) as the screw rod (42) rotates. The moving block (43) is connected to the third box body (3).

8. The range hood according to claim 1, characterized in that: The driving assembly (4) further comprises a first slide rail assembly and a second slide rail assembly, wherein the first slide rail assembly comprises a first slide rail (61) arranged on the first box body (1) and a first slider (62) arranged on the third box body (3), and the first slider (62) is lifted and lowered 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 slider (72) arranged on the third box body (3), and the second slider (72) is lifted and lowered along the second slide rail (71).

9. The range hood according to claim 1, characterized in that: A smoke baffle (31) is provided on the front side wall of the third box body (3).

Images