Double-air-duct structure and range hood

Abstract

The double-air-duct structure comprises an exhaust fume collecting hood, an exhaust fume outlet bin arranged above the exhaust fume collecting hood, a main fan driving air to flow to the exhaust fume outlet bin through the exhaust fume collecting hood and at least one auxiliary fan, a main air duct and a compression air duct are arranged in the exhaust fume outlet bin, the main fan is located in the main air duct, and the compression air duct is located in the main air duct. The auxiliary fan drives air in the compression air duct to flow to the main air duct in an accelerated mode, the compression air duct communicates with the exhaust fume collecting hood, and the auxiliary fan drives the air to flow to the compression air duct through the exhaust fume collecting hood. On the basis of a traditional air duct, the compression air duct and the auxiliary fan are additionally arranged, air is compressed through the auxiliary fan and then sprayed out in an accelerated mode, the internal and external pressure difference is increased, strong suction force can be generated, and the oil smoke suction effect is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a double air duct structure and a range hood. Background Art

[0002] A range hood is an electrical appliance used in the kitchen. Its main function is to remove the fumes, steam and odors generated during cooking. It can not only reduce the pollution of the kitchen environment caused by fumes, keep the kitchen air fresh and the environment clean, but also protect the health of family members and reduce the irritation and harm of fumes to the respiratory system. In modern family kitchens, range hoods have become one of the necessary electrical appliances.

[0003] There are various types of range hoods on the market, including top suction, side suction, European style, Chinese style, etc., to meet the needs of different kitchen spaces and cooking habits. Range hoods are usually installed above or on the side of the stove. The motor drives the fan to generate negative pressure, sucking the fumes and air into the machine body, filtering through the filter or oil cup and other components to separate the fumes and odors, and exhaust the clean air to the outside.

[0004] Traditional range hoods all adopt a single air duct structure, and the realization of air volume and air pressure depends on a main fan. If you want to improve the working efficiency of the range hood, you can only use a main fan with better performance, larger size and higher cost. At the same time, the performance upper limit of the main fan invisibly limits the improvement space of the range hood, resulting in high product prices and poor user experience. Utility Model Content

[0005] In order to solve the defect of poor performance of existing range hoods, the utility model proposes a dual air duct structure and a range hood. On the basis of the traditional air duct, a compression air duct is added. The air is compressed and sprayed out by an auxiliary fan, thereby increasing the internal and external pressure difference, generating strong suction force, and significantly improving the range hood extraction effect.

[0006] The technical solution adopted by the utility model is to design a double air duct structure, including: a smoke collecting hood, a smoke outlet bin arranged above the smoke collecting hood, a main fan for driving air to flow to the smoke outlet bin through the smoke collecting hood, and at least one auxiliary fan, a main air duct and a compressed air duct are arranged inside the smoke outlet bin, the main fan is located in the main air duct, and the auxiliary fan drives the air in the compressed air duct to accelerate and flow toward the main air duct.

[0007] Furthermore, the compressed air duct is connected to the smoke collecting hood, and the auxiliary fan drives the air to flow to the compressed air duct through the smoke collecting hood.

[0008] Furthermore, a guide tube is provided inside the smoke outlet bin below the main fan, and a gap is provided between the outer wall of the guide tube and the inner wall of the smoke outlet bin to form a compression air duct, the air outlet of the compression air duct is located at the top thereof and faces the main fan.

[0009] Furthermore, a baffle ring is provided inside the smoke outlet bin, the baffle ring blocks the top of the guide tube, and a gap is provided between the top of the guide tube and the baffle ring to form an air outlet of the compressed air duct.

[0010] Furthermore, the top edge of the guide tube is bent downward to form an arc-shaped extension portion extending into the compression air duct, and the airflow in the compression air duct bypasses the arc-shaped extension portion and flows toward the air outlet.

[0011] Furthermore, the outer diameter of the guide tube gradually increases from the middle to both ends.

[0012] Furthermore, an installation cavity is provided on the outer side of the smoke outlet bin, the auxiliary fan is located in the installation cavity, and the installation cavity is provided with a first air outlet connected to the compression air duct and a second air outlet connected to the smoke collecting hood.

[0013] In some embodiments, a plurality of auxiliary fans are evenly distributed outside the smoke outlet bin.

[0014] The utility model also provides a range hood, which adopts the above-mentioned double air duct structure.

[0015] Furthermore, the smoke exhaust port at the top of the smoke outlet bin is connected to the smoke exhaust duct.

[0016] Compared with the prior art, the utility model adopts dual air ducts and dual fans. The air is compressed by the auxiliary fan and then ejected out from the compressed air duct at an accelerated speed, thereby increasing the internal and external pressure difference, making the smoke outlet chamber generate strong suction force, effectively improving the oil fume absorption effect, and solving the problem of difficulty in improving the performance of the main fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is described in detail below with reference to the embodiments and drawings, wherein:

[0018] Figure 1 It is a schematic diagram of the structure of some embodiments of the utility model;

[0019] Figure 2 It is a schematic diagram of airflow in some embodiments of the utility model;

[0020] Description of the drawings: 1. Smoke hood; 2. Smoke outlet; 21. Smoke exhaust port; 22. Main air duct; 23. Compression air duct; 24. Installation cavity; 3. Main fan; 4. Auxiliary fan; 5. Guide tube; 51. Arc-shaped extension; 6. Baffle ring. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] like Figure 1 , 2 As shown, the double air duct structure includes: a smoke collecting hood 1, a smoke outlet bin 2, a main fan 3 and at least one auxiliary fan 4. The smoke outlet bin 2 is installed above the smoke collecting hood 1, the bottom of the smoke outlet bin 2 is connected to the smoke collecting hood 1, and a smoke exhaust port 21 is provided on the top. The main fan 3 is installed inside the smoke outlet bin 2. The air in the smoke collecting hood 1 is driven by the main fan 3 to flow to the smoke outlet bin 2, forming a negative pressure area in the smoke collecting hood 1, so that the oil smoke near the smoke collecting hood 1 is sucked into the smoke collecting hood 1.

[0023] A main air duct 22 and a compression air duct 23 are provided inside the smoke outlet chamber 2. The main fan 3 is located in the main air duct 22. The auxiliary fan 4 drives the air in the compression air duct 23 to accelerate and flow toward the main air duct 22. The air flow speed in the main air duct 22 is faster and the pressure difference between the inside and the outside is greater, thereby generating a strong suction force, prompting the oil smoke to be quickly sucked into the smoke collecting hood 1, effectively improving the oil smoke absorption effect.

[0024] Since the function of the compressed air duct 23 is to accelerate the airflow to the main air duct 22, the air intake mode of the compressed air duct 23 can be designed according to different actual application scenarios. As a preferred solution, the compressed air duct 23 is connected to the smoke hood 1, and the auxiliary fan 4 drives the air through the smoke hood 1 to flow to the compressed air duct 23. The advantage of this design is that the oil smoke in the smoke hood 1 can be sent to the smoke outlet bin 2 more quickly, which can not only prevent the oil smoke in the smoke hood 1 from escaping to the outside, but also strengthen the negative pressure state of the smoke hood 1, further improving the oil smoke absorption effect.

[0025] like Figure 1 , 2 As shown, in some embodiments of the utility model, a guide tube 5 is provided inside the smoke outlet bin 2, and the guide tube 5 is in a hollow cylindrical shape. The guide tube 5 is located below the main fan 3. The inner wall of the guide tube 5 and the airflow cavity of the smoke outlet bin 2 located above the guide tube 5 together form a main air duct 22. A gap is provided between the outer wall of the guide tube 5 and the inner wall of the smoke outlet bin 2 to form a compression air duct 23. The air outlet of the compression air duct 23 is located at the top thereof, and the air outlet of the compression air duct 23 faces the main fan 3. In other words, the main air duct 22 is designed in the middle of the smoke guide bin 2, and the compression air duct 23 located below the main fan 3 is designed on the lower side of the smoke guide bin 2. The advantage of this design is that the high-speed airflow ejected from the compression air duct 23 is sent from the side to the main fan 3, and the air flow speed is accelerated along the airflow direction of the main air duct 22.

[0026] On this basis, a baffle ring 6 is further provided inside the smoke outlet bin 2, and the baffle ring 6 blocks the top of the guide tube 5, and a gap is provided between the top of the guide tube 5 and the baffle ring 6 to form an air outlet of the compressed air duct 23. The advantage of this design is that the baffle ring 6 is used to limit the gas flow direction of the air outlet, so that the air is directly ejected to the main fan 3 through the air outlet.

[0027] like Figure 1 , 2 As shown, in some embodiments of the utility model, the top edge of the guide tube 5 is bent downward to form an arc-shaped extension portion 51 extending into the compression air duct 23, and the airflow in the compression air duct 23 bypasses the arc-shaped extension portion 51 and flows to the air outlet. The advantage of this design is that after the airflow enters the compression air duct 23, it flows upward to the arc-shaped extension portion 51, and the oil smoke in the airflow contacts the arc-shaped extension portion 51 and is adsorbed on the wall surface, thereby reducing the amount of oil smoke entering the main fan 3 and increasing the service life of the range hood. The oil smoke accumulated on the arc-shaped extension portion 51 will drip or flow downward along the outer wall of the guide tube 5 and gather.

[0028] Preferably, the outer diameter of the guide tube 5 gradually increases from the middle to both ends, and the inner and outer walls of the guide tube 5 are both arc-shaped, so as to facilitate the downward flow of the oil smoke attached to the wall surface.

[0029] In some embodiments of the utility model, an installation cavity 24 is provided outside the smoke outlet bin 2, and the auxiliary fan 4 is located in the installation cavity 24. The installation cavity 24 is provided with a first air port connected to the compression air duct 23 and a second air port connected to the smoke collecting hood 1. The auxiliary fan 4 is placed outside the smoke outlet bin 2 to facilitate the installation and maintenance of the auxiliary fan.

[0030] It should be understood that the dual air duct structure utilizes the cooperation of the auxiliary fan 4 and the compression air duct 23 to improve the working efficiency of the range hood. Therefore, the auxiliary fan 4 can be a small motor with performance and volume inferior to those of the main fan 3. The cost of such a small motor is low, and the cost of setting up the auxiliary fan 4 is less than that of replacing the main fan 3 with better performance.

[0031] In addition, the utility model does not limit the number of auxiliary fans 4. In some embodiments, the dual air duct structure is only equipped with one auxiliary fan 4, which effectively reduces the cost of the whole machine while meeting the high performance requirements of the range hood. In other embodiments, the dual air duct structure is equipped with multiple auxiliary fans 4, where multiple refers to two or more than two. The auxiliary fans 4 are evenly distributed on the outside of the smoke outlet bin 2, and the airflow in the compression air duct 23 is more uniform, the suction force of the range hood is greater, and the smoke extraction effect is better.

[0032] like Figure 1 As shown, the utility model also proposes a range hood, which adopts the above-mentioned double air duct structure. Generally speaking, the smoke outlet 21 at the top of the smoke outlet bin 2 is connected to the smoke exhaust pipe, and the main fan 3 drives the air in the smoke hood 1 to flow to the smoke outlet bin 2, and the air in the smoke outlet bin 2 then flows from the smoke outlet 21 to the smoke exhaust pipe, and is discharged to the external environment through the smoke exhaust pipe.

[0033] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. The order of execution of actions, steps, etc. in the devices and methods shown in the specification and the accompanying drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar sequential terms used for the convenience of description do not mean that they must be implemented in such an order.

[0034] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Double air duct structure, including: A smoke collecting hood, a smoke outlet bin arranged above the smoke collecting hood, and a main fan driving air to flow through the smoke collecting hood to the smoke outlet bin; characterized in that it also includes: at least one auxiliary fan, a main air duct and a compressed air duct are arranged inside the smoke outlet bin, the main fan is located in the main air duct, and the auxiliary fan drives the air in the compressed air duct to accelerate and flow toward the main air duct.

2. The double air duct structure according to claim 1, characterized in that: The compressed air duct is communicated with the smoke collecting hood, and the auxiliary fan drives air to flow to the compressed air duct through the smoke collecting hood.

3. The double air duct structure according to claim 1, characterized in that: A guide tube is provided inside the smoke outlet bin and is located below the main fan. A gap is provided between the outer wall of the guide tube and the inner wall of the smoke outlet bin to form the compression air duct. The air outlet of the compression air duct is located at the top thereof and faces the main fan.

4. The double air duct structure according to claim 3, characterized in that: A baffle ring is further provided inside the smoke outlet bin, the baffle ring blocks the top of the guide tube, and a gap is provided between the top of the guide tube and the baffle ring to form an air outlet of the compressed air duct.

5. The double air duct structure according to claim 4, characterized in that: The top edge of the guide tube is bent downward to form an arc-shaped extension portion extending into the compression air duct, and the airflow in the compression air duct bypasses the arc-shaped extension portion and flows toward the air outlet.

6. The double air duct structure according to claim 3, characterized in that: The outer diameter of the guide tube gradually increases from the middle to both ends.

7. The double air duct structure according to any one of claims 1 to 6, characterized in that: An installation cavity is provided on the outer side of the smoke outlet bin, the auxiliary fan is located in the installation cavity, and the installation cavity is provided with a first air outlet connected to the compression air duct and a second air outlet connected to the smoke collecting hood.

8. The double air duct structure according to claim 7, characterized in that: The plurality of auxiliary fans are evenly distributed on the outside of the smoke outlet bin.

9. A range hood, characterized in that: The range hood adopts the double air duct structure as described in any one of claims 1 to 8.

10. The range hood according to claim 9, characterized in that: The smoke exhaust port on the top of the smoke outlet bin is connected to the smoke exhaust pipe.

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