A lifting type range hood

Abstract

A lifting type range hood, a lower cabinet is lifted relative to an upper cabinet, an air inlet body is lifted relative to the lower cabinet, a lower air inlet cavity and an upper air inlet cavity are formed in the lower cabinet, the upper air inlet cavity extends downward at the rear to form the lower air inlet cavity, the upper cabinet and the space of the upper air inlet cavity at least partially overlap in the state that the lower cabinet and the air inlet body are lifted to the highest position. The air inlet cavity of the lifting type range hood is a variable cross-section passage with wide upper part and narrow lower part, the variable cross-section cavity is beneficial to the quick suction of oil fume from the lower air inlet cavity and the buffering of the oil fume in the upper air inlet cavity, can improve the non-steady flow separation caused by the distortion of the air inlet, stabilize the air pressure of the air inlet, ensure the consistency of the air speed of the air inlet, reduce the escape of oil fume, and the variable cross-section cavity simulates the noise resistance sound elimination principle, when the noise enters the lower air inlet cavity from the upper air inlet cavity, the sound wave is reflected, so that the noise elimination purpose is achieved.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a lift-type range hood. Background Technology

[0002] Range hoods have become an indispensable appliance in modern family kitchens. With their increasing usage, people are paying more and more attention to their smoke extraction efficiency and aesthetic appeal. Traditional top-mounted range hoods are bulky, making it easy for cooks to bump their heads. If the distance between the range hood's air inlet and the area where smoke is generated is large, the smoke's intake path is longer, increasing the extraction time and making it easier for smoke to escape during cooking. Lowering the installation height of the range hood and bringing the inlet as close to the smoke source as possible, while improving smoke extraction, results in a smaller cooking space, making it easier for the cook's head to accidentally hit the smoke hood. Furthermore, a lower installation height also affects visibility and the overall appearance of the kitchen. Therefore, lift-type range hoods were invented, where the smoke inlet can be raised and lowered; it lowers when the hood is on and rises when it is off. For example, the range hood disclosed in Chinese utility model patent No. 202222918682.7 (authorization announcement No. CN 218864291 U) includes a smoke collection chamber, a fan assembly, and a lifting assembly. The fan assembly is located inside the smoke collection chamber, and the lifting assembly is connected to the smoke collection chamber, enabling the smoke collection chamber to rise and fall. When the range hood is running, the lifting assembly lowers the smoke collection chamber below the cabinet, and the fan assembly starts to suck up and exhaust the fumes. When the range hood is not running, the lifting assembly raises the smoke collection chamber into the cabinet, and the fan assembly turns off. This range hood discloses a single-stage lifting structure, which cannot achieve the effect of rapid fume extraction when the smoke collection chamber is lowered, and there is also a possibility of fume escape during operation. For example, the Chinese utility model patent CN201821783223.X (authorization announcement number CN209355322 U) discloses a "Hidden Range Hood," in which the smoke collection hood can move up and down to adjust the distance between the hood and the stove, thus adjusting the smoke extraction area. The movable smoke collection hood can also extend outside the smoke collection hood to further improve the smoke extraction effect. However, it does not disclose the internal flow channel design of the smoke collection chamber, failing to achieve airflow buffering, thus easily causing the problem of smoke escape. In summary, further improvements are needed to existing lift-type range hoods. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a lift-type range hood with better smoke extraction and noise reduction effects, in view of the above-mentioned existing technology.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a lifting range hood, comprising an upper box, a lower box, and an air inlet, wherein the lower box is disposed on the upper box and can move up and down relative to the upper box, and the air inlet is disposed on the lower box and can move up and down relative to the lower box, characterized in that: when both the lower box and the air inlet are lowered to their lowest positions, the lower box has an interconnected lower air inlet cavity and an upper air inlet cavity, the rear of the upper air inlet cavity extends downward to form the lower air inlet cavity; when both the lower box and the air inlet are raised to their highest positions, the spaces of the upper box and the upper air inlet cavity at least partially overlap, and the spaces of the air inlet and the lower air inlet cavity at least partially overlap.

[0005] Preferably, with both the lower housing and the air inlet body at their highest positions, the upper housing extends at least partially into the upper air inlet cavity, and the air inlet body extends at least partially into the lower air inlet cavity. This design allows for a smaller overall height of the range hood when not in operation, facilitating its concealed installation within cabinets, resulting in a cleaner kitchen and saving space.

[0006] The upper air inlet cavity can have various structures. Preferably, the lower housing has an L-shaped upper front plate inside. The upper front plate includes a vertically arranged first plate and a second plate that bends backward from the lower edge of the first plate. The left and right sides inside the lower housing are respectively provided with a left side plate and a right side plate. The upper front plate, the left side plate, the right side plate and the lower housing back plate form the upper air inlet cavity.

[0007] In order for the second plate to receive the oil dripping from the fan system, the upper box is equipped with a fan system, and the vertical projection of the fan system falls on the second plate.

[0008] The left and right side panels can have various installation structures. Preferably, the front edges of the left and right side panels are fixed to the first plate of the upper front panel, and the rear edges of the left and right side panels are fixed to the back plate of the lower housing.

[0009] Further preferably, both the left and right side plates have an upper vertical plate, an inclined plate that bends downwards from the bottom of the upper vertical plate, and a lower vertical plate that bends downwards from the outside of the inclined plate. The top of the upper vertical plate is fixed to the top plate of the lower housing and close to the lower edge of the upper housing. The lower vertical plate is close to the corresponding side plate of the lower housing, and the bottom of the lower vertical plate is connected to the second plate. In this way, the upper air inlet cavity forms a structure that is larger at the bottom and smaller at the top. Both the left and right side plates can play the role of guiding the smoke, directing the oil fume airflow into the fan system above the upper air inlet cavity.

[0010] The lower air inlet cavity can have various structures. Preferably, a lower front plate is installed on the rear side of the second plate. The lower front plate is located below the rear of the upper front plate. The left and right sides of the air inlet of the air inlet body have upwardly extending extension arms. The lower front plate, the extension arms, and the lower box back plate form the lower air inlet cavity.

[0011] The lower front panel can have various mounting structures. Preferably, the lower front panel is vertically arranged, and its top is fixed to the rear edge of the second plate. In this way, with the lower front panel vertically arranged, the lower air inlet cavity forms a completely vertically distributed channel, which facilitates the lifting and lowering movement of the air inlet body.

[0012] In order to enable the air inlet to move up and down relative to the lower housing, a first vertical guide rail is installed between the extension arm and the back plate of the lower housing. Driven by the drive mechanism, the air inlet moves up and down along the first vertical guide rail.

[0013] In order to enable the lower housing to move up and down relative to the upper housing, a fan system is installed in the upper housing. The fan system has a fan frame, and a drive mechanism is installed on the fan frame. A second vertical guide rail is installed between the fan frame and the back plate of the lower housing. Driven by the drive mechanism, the lower housing moves up and down along the second vertical guide rail.

[0014] As a preferred embodiment of any of the preceding claims, an oil cup is installed at the bottom of the air inlet body. In the off state, the air inlet portion of the air inlet body and the oil cup extend entirely into the lower air inlet cavity, with the bottom of the oil cup flush with the bottom of the lower housing. Thus, in the off state, the range hood has a compact and simple structure, and during installation, the entire unit can be concealed in a cabinet, resulting in a high level of aesthetics.

[0015] In a further preferred embodiment, the lower housing moves up and down relative to the upper housing under the drive of the drive mechanism, and the air inlet moves up and down relative to the lower housing under the drive of the drive mechanism.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This lift-type range hood has an air inlet cavity, including an upper air inlet cavity inside the lower housing and a lower air inlet cavity extending downward from the rear of the upper air inlet cavity. The upper air inlet cavity is wide, while the lower air inlet cavity is narrow, creating a variable cross-section cavity. This variable cross-section cavity facilitates the rapid intake of fumes from the lower air inlet cavity, where they are buffered in the upper air inlet cavity. This improves the unsteady flow separation caused by air inlet distortion, stabilizes the air inlet pressure, ensures consistent airflow velocity, and reduces fume escape. Furthermore, the variable cross-section cavity simulates the principle of reactive noise reduction; when noise enters the lower air inlet cavity from the upper air inlet cavity, sound waves are reflected, thus achieving noise reduction. In addition, the wide upper air inlet cavity effectively reduces airflow velocity, minimizing the impact of airflow on oil droplet tracks and preventing oil droplets from flying around. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention (in a non-working state);

[0018] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the range hood.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the range hood from another angle (with the lower back panel removed).

[0020] Figure 4 This is a schematic diagram of the upper front panel according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the right side plate in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention (in working condition);

[0023] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the range hood.

[0024] Figure 8 for Figure 6 The diagram shows the structure of the range hood from another angle (with the lower back panel removed).

[0025] Figure 9 for Figure 6 Another structural cross-sectional view of the range hood shown. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 8 As shown, the lifting range hood of this embodiment includes an upper housing 1, a lower housing 2, and an air inlet 3. The lower housing 2 is wrapped around the upper housing 1 and can move up and down relative to the upper housing 1. The air inlet 3 is housed in the lower housing 2 and can move up and down relative to the lower housing 2. The lower housing 2 and the air inlet 3 can move up and down independently under the drive of the drive mechanism, or they can move up and down synchronously under the drive of the same drive mechanism.

[0028] In this embodiment, a fan system 4 is installed inside the upper housing 1. When both the lower housing 2 and the air inlet 3 are lowered to their lowest positions, the lower housing 2 has an interconnected lower air inlet cavity 5 and an upper air inlet cavity 6. The rear of the upper air inlet cavity 6 extends downward to form the lower air inlet cavity 5. Thus, the lower housing 2 includes a narrow lower air inlet cavity 5 and a wide upper air inlet cavity 6. The lower housing 2 moves up and down relative to the upper housing 1, and the air inlet 3 moves up and down relative to the lower housing 2. The upper air inlet cavity 6 can be used to accommodate the upper housing 1, and the lower air inlet cavity 5 is used to accommodate the air inlet 3. When both the lower housing 2 and the air inlet 3 are raised to their highest positions, the spaces of the upper housing 1 and the upper air inlet cavity 6 at least partially overlap, and the upper housing 1 at least partially extends into the upper air inlet cavity 6. The spaces of the air inlet 3 and the lower air inlet cavity 5 at least partially overlap, and the air inlet 3 at least partially extends into the lower air inlet cavity 5. This design allows the range hood to be relatively short and compact when not in use, making it easy to conceal in cabinets, resulting in a cleaner kitchen and saving space.

[0029] In this embodiment, the upper air inlet cavity 6 and the lower air inlet cavity 5 form a variable cross-section air inlet channel. Oil fumes enter the upper air inlet cavity 6 through the narrow lower air inlet cavity 5, and then enter the fan system 4 of the upper housing 1. Because the lower air inlet cavity 5 has a narrow front-to-back width, the oil fume flow velocity is fast, which can drive the external flow field to achieve faster airflow, giving the oil fumes a greater backward velocity in the same amount of time, preventing oil fumes from escaping. However, at the same time, the airflow here will also be turbulent, causing uneven oil fume flow velocity at the air inlet, affecting the oil fume extraction effect. The wide upper air inlet cavity 6 is located downstream of the lower air inlet cavity 5. Due to its larger volume, the upper air inlet cavity 6 can construct a highly efficient pressure stabilizing cavity, allowing the airflow to be buffered and stabilized within the pressure stabilizing cavity, ensuring that there is a basically uniform wind speed at the air inlet, avoiding the problem of smoke escaping from both sides of the range hood. Furthermore, the oil stains inside the upper housing 1 will drip into the lower housing 2, and the problem of oil splashing and falling is difficult to deal with, especially when there is a lot of condensed oil inside the fan system 4. The wide upper air inlet 6 can effectively reduce the wind speed, reduce the influence of airflow on the trajectory of oil droplets, and prevent oil droplets dripping from the volute of the fan system 4 from splashing.

[0030] In addition, the upper air inlet cavity 6 in this embodiment can also effectively block the direct transmission of noise from the fan system 4. By simulating the principle of resistance silencing, the sound waves emitted from the fan system 4 are reflected multiple times inside the wide upper air inlet cavity 6 and thus canceled out. Therefore, a variable cross-section acoustic impedance is constructed to reduce the energy of sound propagation from the fan air inlet to the range hood air inlet.

[0031] In this embodiment, the lower housing 2 has an L-shaped upper front panel 7 inside. The upper front panel 7 includes a vertically arranged first plate 71 and a second plate 72 bent backward from the lower edge of the first plate 71. A left side panel 81 and a right side panel 82 are respectively provided on the left and right sides inside the lower housing 2. The upper front panel 7, left side panel 81, right side panel 82, and lower housing back panel 21 form an upper air inlet cavity 6. The front edges of the left side panel 81 and right side panel 82 are fixed to the first plate 71 of the upper front panel 7, and the rear edges of the left side panel 81 and right side panel 82 are fixed to the lower housing back panel 21. Figure 9 As shown, the vertical projection of the fan system 4 falls on the second plate 72, which can catch the oil dripping from the fan system.

[0032] Combination Figure 5 and Figure 8 As shown, in this embodiment, both the left side plate 81 and the right side plate 82 have an upper vertical plate 83, an inclined plate 84 that bends downwards from the bottom of the upper vertical plate 83, and a lower vertical plate 85 that bends downwards from the outside of the inclined plate 84. The top of the upper vertical plate 83 is fixed to the top plate 22 of the lower housing and is close to the lower edge of the upper housing 1. The lower vertical plate 85 is close to the corresponding side plate of the lower housing 2, and the bottom of the lower vertical plate 85 is connected to the second plate 72. In this way, the diameter of the cavity formed by the upper enclosure of the left side plate 81 and the right side plate 82 is smaller than the diameter of the cavity formed by the lower enclosure. That is, the upper air inlet cavity 6 forms a structure that is smaller at the top and larger at the bottom. Both the left side plate 81 and the right side plate 82 can play the role of guiding smoke, quickly guiding the oil fume airflow into the fan system 4 above the upper air inlet cavity 6, which is beneficial to improving the oil fume absorption effect.

[0033] In this embodiment, a lower front plate 9 is installed on the rear side of the second plate 72, and the top of the lower front plate 9 is fixed at the rear edge of the second plate 72. The lower front plate 9 is located below the rear of the upper front plate 7. The air inlet 31 of the air inlet body 3 has upwardly extending extension arms 32 on both the left and right sides. The lower front plate 9, the extension arms 32, and the lower box back plate 21 form a lower air inlet cavity 5.

[0034] In this embodiment, the second plate 72 is horizontally positioned or slightly inclined downwards from front to back, while the lower front plate 9 is vertically positioned. When the angle between the lower front plate 9 and the second plate 72 reaches 90°, the turning angle of the variable cross-section is at its maximum. This generates numerous small turbulences, increasing the contact between the oil fumes and the second plate 72. Consequently, more condensed oil is generated on the second plate 72, reducing the amount of oil fumes entering the fan system 4 and thus reducing the amount of oil contamination on the impeller. Furthermore, the turbulence generated at the turning point, in terms of the oil fume path, is downstream of the large pressure stabilizing chamber, i.e., the upper air inlet chamber 6. The pressure stabilizing chamber has a certain height, thus the airflow can be effectively buffered and stabilized, avoiding the impact of turbulence on the oil fume extraction effect.

[0035] A first vertical guide rail 11 is installed between the extension arm 32 and the lower housing back plate 21. Driven by the drive mechanism, the air inlet 3 moves up and down along the first vertical guide rail 11. A fan frame 10 is provided inside the upper housing 1. A drive mechanism is installed on the fan frame 10. A second vertical guide rail 12 is installed between the fan frame 10 and the lower housing back plate 21. Driven by the drive mechanism, the lower housing 2 moves up and down along the second vertical guide rail 12.

[0036] In this embodiment, an oil cup 13 is installed at the bottom of the air inlet 3, such as... Figures 1 to 3 As shown, in the non-working state, the air inlet 31 and oil cup 13 of the air inlet body 3 extend entirely into the lower air inlet cavity 5, and the smoke inlet 30 is completely hidden inside the lower air inlet cavity 5. Furthermore, the bottom of the oil cup 13 is flush with the bottom of the lower housing 2. In the non-working state, the range hood has a compact and simple structure, and during installation, the entire unit can be hidden in a cabinet, resulting in a high level of aesthetics.

[0037] like Figures 6 to 8 As shown, in the working state, the fan system 4 is located above the upper air inlet 6, the air inlet 3 extends downward to the bottom of the lower box 2 and the smoke inlet 30 is exposed, the negative pressure zone moves downward and the oil fume extraction effect is improved.

[0038] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0039] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts, collectively referred to as the first part and the second part, meaning that a fluid, gas, liquid, or a mixture of both can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber that allows fluid to flow through, or a combination of the above.

Claims

1. A lifting type range hood comprising an upper cabinet (1), a lower cabinet (2) and an air inlet body (3), the lower cabinet (2) being arranged on the upper cabinet (1) and capable of lifting movement relative to the upper cabinet (1), the air inlet body (3) being arranged on the lower cabinet (2) and capable of lifting movement relative to the lower cabinet (2), characterized in that: In the state that the lower cabinet (2) and the air inlet body (3) are lowered to the lowest position, a lower air inlet cavity (5) and an upper air inlet cavity (6) are formed in the lower cabinet (2) and are in communication with each other, the rear part of the upper air inlet cavity (6) extends downward to form the lower air inlet cavity (5), in the state that the lower cabinet (2) and the air inlet body (3) are raised to the highest position, the upper cabinet (1) and the space of the upper air inlet cavity (6) at least partially overlap, the air inlet body (3) and the space of the lower air inlet cavity (5) at least partially overlap, in the state that the lower cabinet (2) and the air inlet body (3) are raised to the highest position, the upper cabinet (1) at least partially extends into the inside of the upper air inlet cavity (6), the air inlet body (3) at least partially extends into the inside of the lower air inlet cavity (5), the inside of the lower cabinet (2) is provided with an upper front plate (7) in an L-shaped structure, the upper front plate (7) comprises a first plate body (71) arranged vertically and a second plate body (72) bent rearward from the lower edge of the first plate body (71), the left and right sides of the inside of the lower cabinet are respectively provided with a left side plate (81) and a right side plate (82), and the upper front plate (7), the left side plate (81), the right side plate (82) and the back plate (21) of the lower cabinet enclose the upper air inlet cavity (6).

2. The lifting type range hood according to claim 1, characterized in that: The fan system (4) is installed in the upper cabinet (1) and the projection of the fan system (4) in the vertical direction falls on the second plate body (72).

3. The lifting type range hood according to claim 1, characterized in that: The front side edges of the left side plate (81) and the right side plate (82) are fixed on the first plate body (71) of the upper front plate (7), and the rear side edges of the left side plate (81) and the right side plate (82) are fixed on the back plate (21) of the lower cabinet.

4. The lifting hood according to claim 1, characterized in that: The left side plate (81) and the right side plate (82) each have an upper vertical plate (83), an inclined plate (84) bent obliquely downward from the bottom of the upper vertical plate (83) to the outer side, and a lower vertical plate (85) bent downward from the outer side of the inclined plate (84), the top of the upper vertical plate (83) is fixed on the top plate (22) of the lower cabinet and is close to the lower edge of the upper cabinet (1), the lower vertical plate (85) is close to the corresponding side plate of the lower cabinet (2), and the bottom of the lower vertical plate (85) is connected with the second plate body (72).

5. The lifting hood according to claim 1, characterized in that: A lower front plate (9) is installed on the rear side of the second plate body (72), the lower front plate (9) is arranged below and rearward of the upper front plate (7), the left and right sides of the air inlet part (31) of the air inlet body (3) each has an extension arm (32) extending upward, and the lower front plate (9), the extension arm (32) and the back plate (21) of the lower cabinet enclose the lower air inlet cavity (5).

6. The lifting hood according to claim 5, characterized in that: The lower front plate (9) is arranged vertically, and the top of the lower front plate (9) is fixed at the rear edge of the second plate body (72).

7. The lifting hood according to claim 5, characterized in that: A first vertical guide rail (11) is installed between the extension arm (32) and the back plate (21) of the lower cabinet, and the air inlet body (3) moves up and down along the first vertical guide rail (11) under the driving of the driving mechanism.

8. The lifting hood according to claim 1, characterized in that: The upper box body (1) is provided with a fan system (4), the fan system (4) is provided with a fan frame (10), a driving mechanism is installed on the fan frame (10), a second vertical guide rail (12) is installed between the fan frame (10) and the lower box body back plate (21), and the lower box body (2) moves up and down along the second vertical guide rail (12) under the driving of the driving mechanism.

9. The lifting hood according to any one of claims 1 to 8, characterized in that: An oil cup (13) is installed at the bottom of the air inlet body (3), the air inlet part (31) of the air inlet body (3) and the oil cup (13) are integrally inserted into the lower air inlet cavity (5) in the shutdown state, and the bottom of the oil cup (13) is flush with the bottom of the lower box body (2).

10. The lifting hood according to claim 1, characterized in that: The lower box body (2) moves up and down relative to the upper box body (1) under the driving of the driving mechanism, and the air inlet body (3) moves up and down relative to the lower box body (2) under the driving of the driving mechanism.

Images