CN219828924U - Fume exhaust fan - Google Patents

Abstract

The embodiment of the utility model provides a range hood, which comprises: the first end of the shell is provided with a first air inlet and a second air outlet, the second air outlet surrounds the outer side of the first air inlet, and the second end of the shell is provided with the first air outlet and the second air inlet which are arranged at intervals; the fresh air shell is arranged in the inner cavity of the shell and is communicated with the second air inlet and the second air outlet; and a containing space for communicating the first air inlet and the first air outlet is formed between the outer shell wall of the fresh air shell and the inner shell wall of the outer shell; the fan assembly comprises a first impeller, a second impeller and a rotating shaft, the first impeller is arranged in the accommodating space, the second impeller is arranged in the fresh air shell, the rotating shaft penetrates through the fresh air shell, and two ends of the rotating shaft are respectively connected with the first impeller and the second impeller; the diameter of the first impeller is larger than that of the second impeller; and/or the thickness of the first impeller is greater than the thickness of the second impeller. The range hood provided by the utility model has the advantage of good suction effect.

Description

Fume exhaust fan

Technical Field

The embodiment of the utility model relates to the technical field of range hoods, in particular to a range hood.

Background

Chinese cooking is generally mainly performed by high temperature and high heat and strong fire, which can lead to the generation of a large amount of lampblack. The range hood is an electric appliance for sucking and cleaning the oil smoke generated during cooking, and aims to solve the problem of kitchen air quality and improve cooking experience of a user.

In the related art, in order to improve the suction of the range hood, a high-power fan and a method with higher fan rotating speed are adopted so as to achieve the purposes of increasing the ventilation quantity and realizing the rapid discharge of the oil smoke.

However, the above method reduces the air pressure in the kitchen, and the air quantity in the kitchen is insufficient, which affects the exhaust quantity of the range hood.

Disclosure of Invention

The embodiment of the utility model provides a range hood, which is used for solving the problems that the air pressure in a kitchen is reduced, the air quantity in the kitchen is insufficient and the exhaust quantity of the range hood is influenced by a method in related technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

one aspect of an embodiment of the present utility model provides a range hood, including: the shell is provided with a first end and a second end which are oppositely arranged, the first end of the shell is provided with a first air inlet and a second air outlet, the second air outlet surrounds the outer side of the first air inlet, and the second end of the shell is provided with a first air outlet and a second air inlet which are arranged at intervals; the fresh air shell is arranged in the inner cavity of the shell and is communicated with the second air inlet and the second air outlet; an accommodating space is formed between the outer shell wall of the fresh air shell and the inner shell wall of the outer shell, and the accommodating space is communicated with the first air inlet and the first air outlet; the fan assembly comprises a first impeller, a second impeller and a rotating shaft, wherein the first impeller is rotationally arranged in the accommodating space, the second impeller is rotationally arranged in the fresh air shell, the rotating shaft penetrates through the fresh air shell, and two ends of the rotating shaft are respectively connected with the first impeller and the second impeller; the diameter of the first impeller is larger than that of the second impeller; and/or the thickness of the first impeller is greater than the thickness of the second impeller.

In one possible implementation manner, when the diameter of the first impeller is larger than the diameter of the second impeller, the ratio of the diameter of the first impeller to the diameter of the second impeller is 4:3, a step of; and/or, when the thickness of the first impeller is greater than the thickness of the second impeller, the ratio of the thickness of the first impeller to the thickness of the second impeller is: 2:1.

in one possible implementation manner, the shape of the second air outlet is a ring segment graph with one open end; the fresh air shell comprises a first part and a second part; the first part is in a closed ring shape, surrounds the outer side of the first air inlet and is communicated with the second air outlet; the second part is communicated with one side of the first part, extends along the axial direction of the second air outlet and accommodates the second impeller.

In one possible implementation manner, the first part comprises a plurality of first pipelines, each first pipeline is in a closed ring shape, and the plurality of first pipelines are concentrically arranged; the range hood further comprises a first valve component, wherein the first valve component is arranged on the first part and adjusts the air outlet quantity of the first part.

In one possible implementation, the device further comprises a first controller and a first detector, the first detector being disposed on the housing and configured to detect a smoke state of a first end of the housing; the first controller is in communication connection with the first detector and the first valve component and is configured to judge whether the smoke overflows according to the smoke state of the first end of the shell detected by the first detector, and when the smoke overflows, control the first valve component to increase the air output of the first part.

In one possible implementation manner, the shape of the second air outlet is a ring segment graph with one open end; the fresh air shell comprises a fourth part and a plurality of third parts, the fourth part extends along the axial direction of the second air outlet and is provided with the second impeller in a containing mode, the third parts are communicated with the fourth part at intervals along the axial direction of the second air outlet, and the third parts are communicated with different positions of the second air outlet; the range hood further comprises a second valve assembly, wherein the second valve assembly is arranged on the third parts and adjusts the air output of the third parts.

In one possible implementation, the range hood further includes a second controller and a second detector disposed at the housing and configured to detect a smoke condition at a first end of the housing; the second controller is in communication connection with the second detector and the second valve component, and is configured to judge whether the smoke overflows according to the smoke state of the first end of the shell detected by the second detector, find out the position where the smoke overflows when judging the smoke overflows, determine the third part corresponding to the position where the smoke overflows, and control the second valve component to increase the air outlet quantity of the third part corresponding to the position where the smoke overflows.

In one possible implementation, the range hood further includes a filter disposed in the interior cavity of the fresh air housing upstream of the second impeller.

In one possible implementation manner, the fresh air system further comprises a third controller, a temperature detector and a heater, wherein the temperature detector and the heater are both arranged in the inner cavity of the fresh air shell, and are both in communication connection with the third controller; the temperature detector is configured to detect a temperature in the interior cavity of the fresh air housing, and the third controller is configured to control a heating gear of the heater according to the temperature in the interior cavity of the fresh air housing detected by the temperature detector.

In one possible implementation manner, the air conditioner further comprises a volute, wherein the volute is arranged in the accommodating space and sleeved on the outer side of the first impeller, and one end, communicated with the first air outlet, of the volute is in a flaring shape.

According to the range hood provided by the utility model, the fresh air shell is arranged in the inner cavity of the shell and is communicated with the second air inlet and the second air outlet of the shell, and the second impeller is arranged in the inner cavity of the fresh air shell, so that external air can enter the fresh air shell through the second air inlet when the second impeller operates and flow out from the second air outlet to a kitchen through the inner cavity of the fresh air shell. The second air outlet surrounds the outer side of the first air inlet, so that the second air outlet can intercept smoke and prevent the smoke from escaping, the air pressure at the first air inlet is also improved, and the smoking effect is improved;

in addition, a first impeller is arranged in the accommodating space between the outer shell wall of the fresh air shell and the inner shell wall of the outer shell; the first impeller and the second impeller are connected through the rotating shaft, so that the first impeller and the second impeller rotate coaxially, and the rotating speed of the first impeller is the same as that of the second impeller.

In addition, the diameter of the first impeller is larger than that of the second impeller, and/or the thickness of the first impeller is larger than that of the second impeller, so that the air output of the first impeller is larger than that of the second impeller, and the negative pressure state of a kitchen is kept, so that the first impeller can conveniently suck oil smoke.

In addition to the technical problems, the technical features constituting the technical solutions, and the beneficial effects caused by the technical features of the technical solutions described above, other technical problems that can be solved by the embodiments of the present utility model, other technical features included in the technical solutions, and beneficial effects caused by the technical features described above, further detailed descriptions will be made in the detailed description of the embodiments.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a schematic diagram of a range hood according to an embodiment of the present utility model;

fig. 2 is a top view of the range hood shown in fig. 1;

fig. 3 is a partial cross-sectional view of the range hood shown in fig. 1;

fig. 4 is a schematic flow diagram of the outside air and the oil smoke in the range hood shown in fig. 3;

fig. 5 is a schematic view of the range hood shown in fig. 1 with a housing removed;

fig. 6 is a top view of a first portion and a second portion of a range hood according to an embodiment of the present utility model;

fig. 7 is a control diagram of a range hood according to an embodiment of the present utility model;

fig. 8 is a side view of a third portion and a fourth portion of the range hood according to the embodiment of the present utility model;

FIG. 9 is a top view of one of the third and fourth portions shown in FIG. 5;

FIG. 10 is a top view of the third and fourth portions of the alternative embodiment shown in FIG. 5;

fig. 11 is a control diagram of another range hood according to an embodiment of the present utility model;

fig. 12 is a control diagram of a range hood according to another embodiment of the present utility model;

fig. 13 is a cross-sectional view of a range hood provided by an embodiment of the utility model at a first impeller.

Reference numerals illustrate:

100-a housing; 110-a first air inlet; 120-a first air outlet; 130-a second air inlet; 140-a second air outlet; 141-a first transverse portion; 142-a first vertical portion; 150-a fan part; 160-cover body;

200-fresh air shell; 210-a first part; 211-a first pipeline; 2111-a second lateral portion; 2112-a second vertical portion; 220-a second portion; 230-a third part; 231-a third lateral portion; 232-a third vertical portion; 240-fourth part;

300-accommodating space;

400-fan assembly; 410-a first impeller; 420-a second impeller; 430-a rotating shaft;

510-a first valve component; 520-a second valve component; 530-a heater;

610-a first controller; 620-a second controller; 630-a third controller;

710-a first detector; 720-a second detector; 730—a temperature detector;

800-volute;

900-air duct.

Specific embodiments of the present utility model have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

As described in the background art, the range hood in the related art has the problem of low air pressure in the kitchen and low exhaust amount of the range hood. According to the range hood, the fresh air shell is arranged in the inner cavity of the shell and is communicated with the second air inlet and the second air outlet of the shell, and the second impeller is arranged in the inner cavity of the fresh air shell, so that external air can enter the fresh air shell through the second air inlet when the second impeller operates and flow out from the second air outlet to a kitchen through the inner cavity of the fresh air shell. Because the second air outlet surrounds the outside at first air intake, but the second air outlet interception smog blocks smog loss, has also improved the atmospheric pressure of first air intake department, improves the smoking effect.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The following embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 is a schematic diagram of a range hood according to an embodiment of the present utility model. Referring to fig. 1, a range hood according to an embodiment of the present utility model may include a housing 100, and the housing 100 may include a blower portion 150 and a hood portion 160 sequentially communicating in a first direction. When the range hood according to the embodiment of the present utility model is assembled in a kitchen, the first direction is the plumb line direction, that is, the blower portion 150 and the hood portion 160 are disposed along the plumb line direction. The cover 160 is located below the fan 150. In addition, both the cover 160 and the blower 150 may have a cross-section perpendicular to the first direction, and the cross-section of the cover 160 may be larger than the cross-section of the blower 150.

Fig. 2 is a top view of the range hood shown in fig. 1. Referring to fig. 1 and 2, an end of the cover 160 remote from the fan portion 150 may be a first end of the housing 100, and the end may have a first air inlet 110 and a second air outlet 140, and the second air outlet 140 surrounds the outside of the first air inlet 110. The shape of the first air inlet 110 may be rectangular, and when the range hood is assembled in a kitchen, the first air inlet 110 may correspond to a bracket of a cooking appliance or a kitchen range, so that oil smoke generated when the kitchen range heats the cooking appliance may enter the inner cavity of the cover body 160 through the first air inlet 110.

In addition, the second air outlet 140 may have a ring shape with one end opened; that is, the second air outlet 140 may have a U-shape; in other words, the second air outlet 140 may include a first transverse portion 141 and two first vertical portions 142, the two first vertical portions 142 may be disposed at intervals, and the first transverse portion 141 may be communicated between the two first vertical portions 142. When the range hood is assembled in a kitchen, one end of the second air outlet 140 away from the first transverse portion 141 may face the user.

Fig. 3 is a partial cross-sectional view of the range hood shown in fig. 1. Referring to fig. 1 and 3, an end of the fan portion 150 remote from the cover portion 160 may be a second end of the housing 100, and the end may have a first air outlet 120 and a second air inlet 130 that are spaced apart. In addition, the range hood provided by the embodiment of the utility model can further comprise a fresh air shell 200 and a fan assembly 400. The fresh air casing 200 may be disposed in the inner cavity of the outer casing 100, and the fresh air casing 200 may be communicated with the second air inlet 130 and the second air outlet 140, and a containing space 300 may be formed between the outer casing 100 wall of the fresh air casing 200 and the inner casing wall of the outer casing 100, and the containing space 300 is communicated with the first air inlet 110 and the first air outlet 120.

The fan assembly 400 may include first and second impellers 410, 420 and a shaft 430. The first impeller 410 is rotatably disposed in the accommodating space 300, and the second impeller 420 is rotatably disposed in the fresh air case 200. The rotating shaft 430 may be disposed through the fresh air casing 200, and two ends of the rotating shaft 430 may be respectively connected to the first impeller 410 and the second impeller 420.

Fig. 4 is a schematic flow diagram of the outside air and the oil smoke in the range hood shown in fig. 3. The hollow arrow in fig. 4 indicates the flow direction of the oil smoke, referring to fig. 3 and 4, after the driving member such as the motor drives the rotating shaft 430 to rotate, the rotating shaft 430 can drive the first impeller 410 to rotate, so that the oil smoke can enter the accommodating space 300 through the first air inlet 110 and flow out from the first air outlet 120 through the accommodating space 300, so as to achieve the purpose of sucking the oil smoke.

The wall of the kitchen may be provided with an air inlet communicating with the air outside the kitchen, and the air inlet and the second air outlet 140 may communicate through the air duct 900 shown in fig. 1 so as to introduce the air outside the kitchen. In fig. 4, another arrow indicates the flow direction of the external air, and with continued reference to fig. 3 and 4, after the driving member such as the motor drives the rotating shaft 430 to rotate, the rotating shaft 430 may drive the second impeller 420 to rotate, so that the air outside the kitchen may enter the fresh air housing 200 through the second air inlet 130, and flow out from the second air outlet 140 to the kitchen through the inner cavity of the fresh air housing 200.

The second air outlet 140 surrounds the outer side of the first air inlet 110, so that the second air outlet 140 can intercept smoke and block the smoke from escaping, thereby improving the air pressure at the first air inlet 110 and improving the smoking effect. In addition, the rotating shaft 430 connects the first impeller 410 and the second impeller 420, so that the first impeller 410 and the second impeller 420 rotate coaxially, and the rotating speed of the first impeller 410 is the same as that of the second impeller 420, so that energy is saved.

In addition, the diameter of the first impeller 410 is larger than the diameter of the second impeller 420; and/or, the thickness of the first impeller 410 is greater than that of the second impeller 420, so that the air output of the first impeller 410 is greater than that of the second impeller 420, so as to maintain the negative pressure state of the kitchen, and facilitate the first impeller 410 to suck the oil smoke.

Optionally, the ratio of the diameter of the first impeller 410 to the diameter of the second impeller 420 is 4:3, so as to further improve the suction effect of the range hood. Optionally, the ratio of the thickness of the first impeller 410 to the thickness of the second impeller 420 is: 2:1, so as to further improve the suction effect of the range hood.

The structure of the fresh air housing 200 may have the following several possible implementation manners:

fig. 5 is a schematic view of the range hood shown in fig. 1 with the housing 100 removed. Referring to fig. 3 and 5, in one possible implementation of the fresh air housing 200, the fresh air housing 200 can include a first portion 210 and a second portion 220. The first portion 210 may have a closed ring shape, and the first portion 210 may surround the outside of the first air inlet 110 and may communicate with the second air outlet 140. The second portion 220 may be in communication with one side of the first portion 210, may extend along the axial direction of the second air outlet 140, and may house the second impeller 420. Thus, the air entering from the second air inlet 130 may flow out from the second air outlet 140 through the second portion 220 and then through the first portion 210.

Referring to fig. 2 and 5, a side of the first portion 210, which is in communication with the second portion 220, is the same side as a side of the second air outlet 140, which is away from the first transverse portion 141. For example, the first portion 210 may include two second lateral portions 2111 and two second vertical portions 2112 in communication, and the inner cavities of the second lateral portions 2111 and the inner cavities of the two second vertical portions 2112 form an annular inner cavity of the first portion 210. The two second vertical portions 2112 are disposed at intervals, and the two second lateral portions 2111 are disposed between the two second vertical portions 2112 at intervals. The sides of the two second vertical portions 2112 facing the second air outlet 140 are each provided with an air outlet hole, so that the two second vertical portions 2112 in fig. 5 are respectively communicated with the two first vertical portions 142 of the second air outlet 140 in fig. 2. One side of the two second lateral portions 2111 facing the second air outlet 140 has an air outlet hole so that the second lateral portion 2111 communicates with the first lateral portion 141. In addition, the other of the two second lateral portions 2111 communicates with the second portion 220 such that air entering the first portion 210 from the second portion 220 flows through the second lateral portion 2111, then to the two second vertical portions 2112, and then to the other second lateral portion 2111. In addition, when the range hood is assembled in a kitchen, one side where the second portion 220 is located may be installed toward a user, and the other side may be installed toward a wall.

Wherein the first portion 210 may include a chamber having one ring shape or a plurality of ring-shaped chambers. Fig. 6 is a top view of a first portion 210 and a second portion 220 of a range hood according to an embodiment of the present utility model. Referring to fig. 6, when the first portion 210 has a plurality of annular chambers, the first portion 210 may include a plurality of first pipes 211, each of the first pipes 211 may have a closed annular shape, and the plurality of first pipes 211 may be concentrically disposed. That is, the first portion 210 may have a plurality of concentrically disposed chambers.

The range hood may further include a first valve assembly 510, where the first valve assembly 510 may be disposed on the first portion 210 and adjust the air output of the first pipelines 211. In this way, the user can adjust the first valve component 510 according to the requirement, so as to select one or several first pipelines 211 to be conducted, or adjust the flow of one or several first pipelines 211, thereby achieving the purpose of adjusting the departure amount of the first portion 210. Of course, the first controller 610 and the first detector 710 may also be employed for autonomous adjustment as shown in fig. 7.

In particular, the first detector 710 may be disposed at the housing 100 and may detect a smoke state at a first end of the housing 100. The smoke state may refer to a range of smoke generation, a smoke amount, a smoke concentration, and the like. Referring to fig. 2, it may detect whether there is smoke at a side of the second air outlet 140 facing away from the first air outlet 120, for example; and/or the amount of smoke or the concentration of smoke at the side of the second air outlet 140 facing the first air outlet 120. The first detector 710 may be a smoke sensor, an image sensor, an infrared sensor, or the like. The first detector 710 may convert the detected smoke state of the first end of the housing 100 into an electrical signal and transmit the electrical signal to the first controller 610 through wire-line communication or wireless communication such as microwave.

The first controller 610 may receive the electrical signal, determine whether the smoke is overflowed according to the smoke state of the first end of the housing 100 detected by the first detector 710, generate a control electrical signal when the smoke is overflowed, and transmit the control electrical signal to the first valve assembly 510 through wire communication or wireless communication such as microwave. The first valve component 510 can receive the control signal and increase the air output of the first portion 210.

Fig. 8 is a side view of a third portion 230 and a fourth portion 240 of a range hood according to an embodiment of the present utility model. Referring to fig. 8, in another possible implementation manner of the fresh air casing 200, the fresh air casing 200 includes a fourth portion 240 and a plurality of third portions 230, where the fourth portion 240 extends along the axial direction of the second air outlet 140 and accommodates the second impeller 420, the plurality of third portions 230 are in communication with the fourth portion 240 at intervals along the axial direction of the second air outlet 140, and the plurality of third portions 230 are in communication with different positions of the second air outlet 140. The range hood further comprises a second valve assembly 520, wherein the second valve assembly 520 is disposed on the third portions 230 and adjusts the air output of the third portions 230.

Thus, the second valve component 520 can be adjusted according to the requirement to select a certain third portion 230 to be turned on or a certain number of third portions 230 to be turned on, or to adjust the flow of a certain or a certain number of third portions 230, so as to adjust and control the air output of different positions of the second air outlet 140.

Fig. 9 is a top view of one of the third portion 230 and the fourth portion 240 shown in fig. 5. Referring to fig. 2 and 9, the third portion 230 may exemplarily include two third lateral portions 231 and two fourth lateral portions, and the inner cavities of the third lateral portions 231 and the inner cavities of the two third vertical portions 232 may form an annular inner cavity of the third portion 230. The two third vertical portions 232 are disposed at intervals, and the two third lateral portions 231 are disposed between the two third vertical portions 232 at intervals. One side of one of the two third lateral portions 231 facing the third air outlet has an air outlet (neither the two third vertical portions 232 nor the other third lateral portion 231 is provided with an air outlet), so that the third lateral portion 231 is correspondingly communicated with the first lateral portion 141 of the second air outlet 140.

In addition, the other of the two third lateral portions 231 communicates with the fourth portion 240. The air entering the third portion 230 from the fourth portion 240 flows through the third transverse portion 231 communicating with the fourth portion 240, then flows to the two third vertical portions 232, and then flows from the third transverse portion 231 having the air outlet hole to the first transverse portion 141 of the second air outlet 140. In addition, when the range hood is assembled in a kitchen, one side where the fourth portion 240 is located may be installed toward a user, and the other side may be installed toward a wall. In addition, the second valve assembly 520 may include two valves, which may be provided on the two third vertical portions 232, so as to adjust the air outlet amount of the air flowing out of the air outlet hole of one of the third lateral portions 231 by adjusting the flow direction of the two vertical portions.

Fig. 10 is a top view of another third portion 230 and a fourth portion 240 shown in fig. 5. Referring to fig. 10, the third portion 230 may exemplarily include one third lateral portion 231 and two fourth lateral portions, and the inner cavities of the third lateral portion 231 and the inner cavities of the two third vertical portions 232 may form the inner cavity of the third portion 230. The two third vertical portions 232 are arranged at intervals, and one side of each third vertical portion 232 facing the second air outlet 140 is provided with an air outlet. The third lateral portion 231 communicates between the two third vertical portions 232 and with the fourth portion 240, and the third lateral portion 231 has no air outlet hole.

The air entering the third portion 230 from the fourth portion 240 flows through the third transverse portion 231 and then flows toward the two third vertical portions 232, and flows out from the air outlet holes of the third vertical portions 232 toward the first vertical portion 142 of the second air outlet 140. In addition, when the range hood is assembled in a kitchen, one side where the fourth portion 240 is located may be installed toward a user, and the other side may be installed toward a wall.

The second valve assembly 520 may include two second valves, which may be disposed at the two third vertical portions 232, respectively, to control the air output of the two third vertical portions 232.

The manner in which the second valve component 520 is adjusted may be adjusted by the user or may be automatically adjusted. Referring to fig. 11, in the case of automatic adjustment, the range hood according to the embodiment of the present utility model may further include a second controller 620 and a second detector 720. The second detector 720 may be disposed at the housing 100 and may detect a smoke state of the first end of the housing 100.

The smoke status may refer to a location where smoke is generated, an amount of smoke at the location, a concentration of smoke at the location, and the like. The second detector 720 may be a smoke sensor, an image sensor, an infrared sensor, or the like. The second detector 720 may convert the detected smoke state of the first end of the housing 100 into an electrical signal and transmit it to the first controller 610 through wire-line communication or wireless communication such as microwave.

The second controller 620 may receive the electrical signal, determine whether the smoke overflows according to the smoke state of the first end of the housing 100 detected by the second detector 720, find a position where the smoke overflows when the smoke overflows is determined, determine the third portion 230 corresponding to the position where the smoke overflows, generate a control electrical signal, and transmit the control electrical signal to the second valve assembly 520 through wire-line communication or wireless communication such as microwave. The second valve component 520 may receive the control signal and increase the air output of the third portion 230 corresponding to the location where the smoke overflow occurs.

Optionally, a filter is disposed in the interior of the fresh air housing 200 upstream of the second impeller 420 to facilitate filtering air with the filter. The filter may include a filter mesh, a filter plate, a filter cartridge, and the like.

Fig. 12 is a control diagram of a range hood according to another embodiment of the present utility model. Referring to fig. 12, optionally, the range hood according to the embodiment of the present utility model may further include a third controller 630, a temperature detector 730, and a heater 530. The temperature detector 730 and the heater 530 may be disposed in the inner cavity of the fresh air case 200, and the temperature detector 730 and the heater 530 may be communicatively connected to the third controller 630.

The temperature detector 730 may detect the temperature in the interior of the fresh air housing 200. The third controller 630 may control the heating gear of the heater 530 according to the temperature in the inner cavity of the fresh air case 200 detected by the temperature detector 730, so that the temperature of the air is raised by the heater 530 when the temperature of the air outside the kitchen is low.

Fig. 13 is a cross-sectional view of a range hood provided by an embodiment of the present utility model at a first impeller 410. Referring to fig. 13, optionally, the range hood provided by the embodiment of the present utility model may further include a volute 800, where the volute 800 may be disposed in the accommodating space 300 and sleeved outside the first impeller 410. And one end of the volute 800, which is communicated with the first air outlet 120, may be flared, so as to improve the amount of the fume exhaust of the range hood.

The terms "upper" and "lower" are used to describe the relative positional relationship of the respective structures in the drawings, and are merely for convenience of description, not to limit the scope of the utility model, and the change or adjustment of the relative relationship is considered to be within the scope of the utility model without substantial change of technical content.

It should be noted that: in the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In addition, in the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A range hood, comprising:

the shell is provided with a first end and a second end which are oppositely arranged, the first end of the shell is provided with a first air inlet and a second air outlet, the second air outlet surrounds the outer side of the first air inlet, and the second end of the shell is provided with a first air outlet and a second air inlet which are arranged at intervals;

the fresh air shell is arranged in the inner cavity of the shell and is communicated with the second air inlet and the second air outlet; an accommodating space is formed between the outer shell wall of the fresh air shell and the inner shell wall of the outer shell, and the accommodating space is communicated with the first air inlet and the first air outlet;

the fan assembly comprises a first impeller, a second impeller and a rotating shaft, wherein the first impeller is rotationally arranged in the accommodating space, the second impeller is rotationally arranged in the fresh air shell, the rotating shaft penetrates through the fresh air shell, and two ends of the rotating shaft are respectively connected with the first impeller and the second impeller;

the diameter of the first impeller is larger than that of the second impeller; and/or the thickness of the first impeller is greater than the thickness of the second impeller.

2. The range hood of claim 1, wherein when the diameter of the first impeller is greater than the diameter of the second impeller, the ratio of the diameter of the first impeller to the diameter of the second impeller is 4:3, a step of;

and/or, when the thickness of the first impeller is greater than the thickness of the second impeller, the ratio of the thickness of the first impeller to the thickness of the second impeller is: 2:1.

3. the range hood according to claim 1, wherein the second air outlet is in the shape of a ring segment pattern with one open end;

the fresh air shell comprises a first part and a second part; the first part is in a closed ring shape, surrounds the outer side of the first air inlet and is communicated with the second air outlet; the second part is communicated with one side of the first part, extends along the axial direction of the second air outlet and accommodates the second impeller.

4. A range hood according to claim 3, wherein the first portion comprises a plurality of first pipes, each of the first pipes being in the shape of a closed ring and the plurality of first pipes being arranged concentrically;

the range hood further comprises a first valve component, wherein the first valve component is arranged on the first part and adjusts the air outlet quantity of the first part.

5. The range hood of claim 4, further comprising a first controller and a first detector disposed in the housing and configured to detect a smoke condition at a first end of the housing; the first controller is in communication connection with the first detector and the first valve component and is configured to judge whether the smoke overflows according to the smoke state of the first end of the shell detected by the first detector, and when the smoke overflows, control the first valve component to increase the air output of the first part.

6. The range hood according to claim 1, wherein the second air outlet is in the shape of a ring segment pattern with one open end;

the fresh air shell comprises a fourth part and a plurality of third parts, the fourth part extends along the axial direction of the second air outlet and is provided with the second impeller in a containing mode, the third parts are communicated with the fourth part at intervals along the axial direction of the second air outlet, and the third parts are communicated with different positions of the second air outlet;

the range hood further comprises a second valve assembly, wherein the second valve assembly is arranged on the third parts and adjusts the air output of the third parts.

7. The range hood of claim 6, further comprising a second controller and a second detector disposed in the housing and configured to detect a smoke condition at a first end of the housing; the second controller is in communication connection with the second detector and the second valve component, and is configured to judge whether the smoke overflows according to the smoke state of the first end of the shell detected by the second detector, find out the position where the smoke overflows when judging the smoke overflows, determine the third part corresponding to the position where the smoke overflows, and control the second valve component to increase the air outlet quantity of the third part corresponding to the position where the smoke overflows.

8. The range hood of any one of claims 1-7 further comprising a filter disposed in the interior cavity of the fresh air housing upstream of the second impeller.

9. The range hood of any one of claims 1-7 further comprising a third controller, a temperature detector, and a heater, wherein the temperature detector and the heater are both disposed in the interior cavity of the fresh air housing, and wherein the temperature detector and the heater are both communicatively coupled to the third controller;

the temperature detector is configured to detect a temperature in the interior cavity of the fresh air housing, and the third controller is configured to control a heating gear of the heater according to the temperature in the interior cavity of the fresh air housing detected by the temperature detector.

10. The range hood according to any one of claims 1 to 7, further comprising a volute disposed in the accommodating space and sleeved outside the first impeller, wherein an end of the volute communicating with the first air outlet is flared.