Range hood

Abstract

The utility model relates to a range hood, which comprises a shell, a fan system, a main air inlet, a main air outlet, a main air outlet and a main air outlet, and is characterized in that the shell is internally provided with a fan system; the two air inlet cavities are distributed on the left side and the right side of the rear portion of the shell, and each air inlet cavity communicates with fluid in the shell; and each air inlet assembly is correspondingly arranged in one air inlet cavity, and each air inlet assembly can do lifting motion relative to the corresponding air inlet cavity. The range hood has the advantages that the air inlet cavities are distributed on the left side and the right side of the rear portion of the shell, and the air inlet assembly capable of doing lifting motion is arranged in each air inlet cavity, so that at least one air inlet can be close to a smoke source as much as possible according to different oil smoke amounts, and the oil smoke suction effect is improved; and in addition, the whole range hood does not need to ascend and descend, and only the air inlet assembly needs to ascend and descend, so that the sight of a cooking person is slightly shielded, the cooking person is not easily touched, and the use experience feeling of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil fume purification technology, and in particular to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan installed inside to draw in and exhaust cooking fumes. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] In existing technologies, the air inlet of a range hood is usually in a fixed position. If the distance between the air inlet and the area where the fumes are generated is large, the suction path of the fumes is longer, and the suction time is increased, making it easier for fumes to escape during cooking. To solve this technical problem, Chinese utility model patent ZL 202323300888.4 (authorization announcement number CN221763613U) discloses a height-adjustable range hood. This range hood adjusts its height by turning the knob of the worm gear, which drives the driven gear that rotates coaxially with the worm wheel. This causes the lifting rod to move up and down in the lifting sleeve, thereby moving the range hood up and down.

[0004] While the aforementioned range hoods can be height-adjusted to bring the air inlet as close to the smoke source as possible, and the downward expansion of negative pressure improves smoke extraction, they also have the following limitations: First, they result in insufficient cooking space, making it easy for the cook's head to accidentally hit the smoke collection hood. Furthermore, lowering the range hood also affects visibility and the overall appearance of the kitchen. Second, the entire range hood is raised and lowered, placing a significant weight on the height adjustment mechanism, which may lead to a shorter lifespan for this mechanism. Therefore, further improvements to the existing technology are needed. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a range hood that improves the smoke extraction effect while being less likely to hit the cook and does not obstruct the cook's view, in contrast to the above-mentioned prior art.

[0006] The second technical problem to be solved by this utility model is to provide a range hood with improved service life, in contrast to the above-mentioned prior art.

[0007] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a range hood, comprising:

[0008] The housing has a fan system installed inside it, and the housing has a main air inlet.

[0009] Its features also include:

[0010] Two air inlets are located on the left and right sides of the rear of the housing, and each air inlet is in communication with the internal fluid of the housing; and

[0011] Two air inlet assemblies are provided, each of which is located in one of the air inlet chambers, and each air inlet assembly can move up and down relative to the corresponding air inlet chamber.

[0012] Preferably, each air inlet assembly includes a secondary air inlet located on the front side, and each air inlet assembly has the following state:

[0013] In the first state, each air inlet component is retracted into its corresponding air inlet cavity, thereby closing the secondary air inlet;

[0014] In the second state, the two air intake components can be selectively exposed under the corresponding air intake cavity or simultaneously exposed under the corresponding air intake cavity, thereby opening at least one secondary air intake.

[0015] Preferably, each air inlet assembly is constrained within its corresponding air inlet cavity in a manner that allows it to move up and down, and each air inlet assembly extends into the air inlet cavity from its lower end.

[0016] To simplify the housing design, the housing has a convex cross-section, and the center of the housing has a protrusion that at least partially accommodates the fan system. The air inlet is located on the left and right sides behind the protrusion.

[0017] Preferably, the air inlet assembly includes a hollow box with an open top, and the secondary air inlet is located near the lower end of the box.

[0018] In order to achieve the effect of smoke guidance, the box body has an inclined part that gradually slopes upward from front to back at the position corresponding to the secondary air inlet.

[0019] To address the second technical issue, each air inlet chamber is also equipped with a drive mechanism that controls the lifting and lowering of the corresponding air inlet assembly.

[0020] Preferably, the driving mechanism is a lead screw arranged from top to bottom, and the lead screw is driven and connected to the housing.

[0021] To further extend the lifespan of the drive mechanism, the rear length of the housing is L1, and the length of at least one air inlet cavity is L4. The value of L4 is in the range of 1 / 4*L1≤L4≤1 / 3*L1.

[0022] To improve the fume extraction effect, the range hood also includes a sensor for detecting fumes and a controller electrically connected to the sensor, the controller being electrically connected to two drive mechanisms.

[0023] Compared with the prior art, the advantages of this utility model are as follows: by setting air inlet chambers distributed on the left and right sides of the rear of the housing, and each air inlet chamber is equipped with an air inlet component that can move up and down, at least one air inlet can be placed as close as possible to the smoke source according to the amount of oil fumes, which is conducive to improving the oil fume extraction effect; in addition, the range hood does not require the entire machine to be raised and lowered, only the air inlet component needs to move up and down, and since the air inlet chambers are distributed on the left and right sides of the rear of the housing, the obstruction of the cook's line of sight is small, and it is less likely to bump into the cook, thus improving the user experience. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the range hood in this embodiment of the utility model (the secondary air inlet on the left air inlet assembly is closed, and the secondary air inlet on the right air inlet assembly is closed).

[0025] Figure 2 for Figure 1 A sectional view;

[0026] Figure 3 This is a schematic diagram of the range hood in an embodiment of the present invention (the secondary air inlet on the left air inlet assembly is open, and the secondary air inlet on the right air inlet assembly is closed).

[0027] Figure 4 This is a schematic diagram of the range hood in an embodiment of the present invention (the secondary air inlet on the left air inlet assembly is closed, and the secondary air inlet on the right air inlet assembly is open);

[0028] Figure 5 This is a schematic diagram of the range hood in an embodiment of the present invention (the secondary air inlet on the left air inlet assembly is open, and the secondary air inlet on the right air inlet assembly is open);

[0029] Figure 6 for Figure 5 Exploded view;

[0030] Figure 7 for Figure 6 Another perspective illustration;

[0031] Figure 8 for Figure 5 Vertical sectional view;

[0032] Figure 9 for Figure 5 A cross-sectional view. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figures 1-9 As shown, the range hood in this embodiment includes a housing 1, a fan system 2 installed inside the housing 1, two air inlet chambers 3, and two air inlet assemblies 4. The housing 1 has a main air inlet 1a. The two air inlet chambers 3 are distributed on the left and right sides of the rear of the housing 1, and each air inlet chamber 3 is in fluid flow with the interior of the housing 1. The two air inlet assemblies 4 are respectively disposed in one of the air inlet chambers 3, and each air inlet assembly 4 can move up and down relative to the corresponding air inlet chamber 3.

[0035] like Figure 9 As shown, the cross-section of the housing 1 in this embodiment is convex. The housing 1 has a protrusion 11 in the center, which at least partially accommodates the fan system 2. The air inlet cavity 3 is located on the left and right sides behind the protrusion 11.

[0036] Each air inlet assembly 4 includes a secondary air inlet 41 located on the front side. Each air inlet assembly 4 has the following states: In the first state, each air inlet assembly 4 is retracted into its corresponding air inlet cavity 3, thereby closing the secondary air inlet 41, such as... Figure 1 As shown, in this embodiment, both secondary air inlets 41 are closed; in the second state, the two air inlet components can be selectively exposed below the corresponding air inlet cavity 3 or simultaneously exposed below the corresponding air inlet cavity 3, thereby opening at least one secondary air inlet 41; the air inlet component located on the left side of the protrusion 11 is referred to as the left air inlet component, and the air inlet component located on the right side of the protrusion 11 is referred to as the left air inlet component, as follows. Figure 3 As shown, the secondary air inlet on the left air inlet assembly is open, while the secondary air inlet on the right air inlet assembly is closed; Figure 4 As shown, the secondary air inlet on the left air inlet assembly is closed, and the secondary air inlet on the right air inlet assembly is open; Figure 5 As shown, the secondary air inlet on the left air inlet assembly is open, and the secondary air inlet on the right air inlet assembly is open.

[0037] Each air inlet assembly 4 is constrained within its corresponding air inlet cavity 3 in a manner that allows it to move vertically, and each air inlet assembly 4 extends into the air inlet cavity 3 from its lower end. For example... Figure 6 and Figure 7 As shown, the air inlet assembly 4 includes a hollow box 42 with an open top, and a secondary air inlet 41 is located near the lower end of the box 42. Inside the box 42, at a position corresponding to the secondary air inlet 41, there is an inclined portion 421 that gradually slopes upward from front to back, and this inclined portion 421 serves to guide smoke.

[0038] Each air inlet chamber 3 is also equipped with a drive mechanism 5 that controls the lifting and lowering of the corresponding air inlet assembly 4. For example... Figure 7 As shown, in this embodiment, the driving mechanism 5 is a lead screw arranged from top to bottom, and the lead screw is driven and connected to the housing 42. The above-mentioned technology of using a lead screw to drive the housing 42 to rise and fall is existing technology and will not be described in detail here.

[0039] like Figure 9 As shown, the rear length of the housing 1 is L1, and the length of at least one air inlet cavity 3 is L4. If the length of the air inlet cavity 3 is too small, the air inlet channel inside the air inlet cavity 3 will be narrow; if the length of the air inlet cavity 3 is too large, the length of the protrusion 11 will be too small, which will affect the oil fume extraction effect of the protrusion 11. Therefore, in this embodiment, the value range of L4 is: 1 / 4*L1≤L4≤1 / 3*L1. The volume of the air inlet assembly that a single lead screw needs to drive is reduced, which will reduce the weight that the lead screw needs to bear, thus extending the service life of the drive mechanism 5.

[0040] In this embodiment, the range hood also includes a sensor (not shown in the figure) for detecting cooking fumes and a controller (not shown in the figure) electrically connected to the sensor. The controller is electrically connected to two drive mechanisms 5. This controller can be the main controller within the range hood.

[0041] In this embodiment, the working process of the range hood is as follows:

[0042] When the amount of oil fumes detected by the sensor is less than the preset value, the secondary air inlet on the left air inlet assembly and the secondary air inlet on the right air inlet assembly are closed, so as not to obstruct the view of the cook. At this time, air is only introduced through the main air inlet 1a.

[0043] When the amount of oil fumes detected by the sensor reaches the preset value, at least one secondary air inlet 41 is opened, and air is drawn in through the main air inlet 1a and at least one secondary air inlet 41. Since the left air inlet assembly and the right air inlet assembly are both located on the rear side of the housing, the lifting of at least one of the left air inlet assembly and the right air inlet assembly has little obstruction to the cook's line of sight, and will not affect the line of sight or the overall appearance of the kitchen. In addition, the cook's head is not likely to be bumped.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A range hood, comprising: a housing (1) in which a fan system (2) is installed, and a main air inlet (1a) is formed on the housing (1); characterized in that it further comprises: two air inlet cavities (3) distributed on the left and right sides of the rear of the housing (1), each air inlet cavity (3) being in fluid communication with the inside of the housing (1); and two air inlet assemblies (4), each air inlet assembly (4) being arranged in one of the air inlet cavities (3) and being capable of ascending and descending relative to the corresponding air inlet cavity (3); each air inlet assembly (4) comprising a secondary air inlet (41) formed on the front side, each air inlet assembly (4) having the following states: in a first state, each air inlet assembly (4) is folded into the corresponding air inlet cavity (3), thereby closing the secondary air inlet (41); and in a second state, the two air inlet assemblies can be selectively exposed below the corresponding air inlet cavity (3) or simultaneously exposed below the corresponding air inlet cavity (3), thereby opening at least one secondary air inlet (41).

2. The hood according to claim 1, characterized in that: Each air inlet assembly (4) is movably constrained in the corresponding air inlet cavity (3), and each air inlet assembly (4) extends into the air inlet cavity (3) from the lower end of the corresponding air inlet cavity (3).

3. The hood according to claim 1 or 2, characterized in that: The cross section of the housing (1) is in the shape of a convex letter, the central part of the housing (1) has a convex part (11) for at least partially accommodating the fan system (2), and the air inlet cavities (3) are arranged on the left and right sides of the rear of the convex part (11).

4. The hood according to claim 3, characterized in that: The air inlet assembly (4) comprises a box body (42) which is hollow inside and open at the top, and the secondary air inlet (41) is formed near the lower end of the box body (42).

5. The hood according to claim 4, characterized in that: The box body (42) is provided with an inclined part (421) which gradually inclines upward from front to back at a position corresponding to the secondary air inlet (41).

6. The hood according to claim 4, characterized in that: Each air inlet cavity (3) is further provided with a driving mechanism (5) for controlling the ascending and descending of the corresponding air inlet assembly (4).

7. The hood according to claim 6, characterized in that: The driving mechanism (5) is a screw rod arranged from top to bottom, and the screw rod is drivingly connected with the box body (42).

8. The hood according to claim 7, characterized in that: The length of the rear side of the housing (1) is L1, the length of at least one air inlet cavity (3) is L4, and the value of L4 is in the range of 1 / 4*L1≤L4≤1 / 3*L1.

9. The hood according to claim 6, characterized in that: The range hood further comprises a sensor for detecting oil fume and a controller electrically connected with the sensor, and the controller is electrically connected with the two driving mechanisms (5).

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