Range hood

Abstract

The range hood comprises a shell, a draught fan and a smoke baffle, an air inlet is formed in the shell, the draught fan is arranged in the shell, one side of the draught fan and the corresponding inner wall of the shell are arranged in a spaced mode and define a first air path, and the other side, opposite to the draught fan, of the draught fan and the corresponding inner wall of the shell are arranged in a spaced mode and define a second air path; the baffle rotates around the rotating shaft and is installed at the air inlet, the smoke barrier comprises a first smoke barrier part and a second smoke barrier part which are located on the two sides of the rotating shaft respectively, the smoke barrier has a closing position and a balance position, and when the smoke barrier rotates to the closing position, the air inlet is closed; when the smoke blocking plate rotates to the balance position, the air inlet is opened, the first smoke blocking part and the edge of one side of the air inlet define a first inlet, and the second smoke blocking part and the edge of the other side, opposite to the air inlet, of the second smoke blocking part define a second inlet; in the thickness direction of the range hood, the first inlet and the first air path are located at the same end, and the second inlet and the second air path are located at the other opposite end.

Description

[0001] Related Applications

[0002] This application claims priority to Chinese patent application filed on July 12, 2024, with application number 2024109359795 and invention name “Ranger Hood”, the contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of range hoods, and in particular to a range hood. Background Art

[0004] The double-inlet range hood can form a double suction duct, which can make full use of the air inlets in front and behind the fan and significantly improve the smoke exhaust effect. The common range hoods on the market usually have only one oil fume inlet on the exhaust device, or two oil fume inlets are arranged side by side on the left and right. However, this arrangement of the oil fume inlet does not work well with the front and rear air inlets of the fan for the double suction duct with front and rear air inlet, and does not bring out the best effect of the fan with front and rear air inlet. Summary of the invention

[0005] Based on this, it is necessary to provide a range hood with better fume extraction effect, simpler structure and lower cost.

[0006] A range hood according to claim 1, wherein the housing has an air inlet and the fan is installed inside the housing, and one side of the fan is spaced apart from and surrounded by a corresponding inner wall of the housing to form a first air path, and the other side opposite to the fan is spaced apart from and surrounded by a corresponding inner wall of the housing to form a second air path; a rotating shaft is provided on the smoke shield, and the shield is rotatably installed around the rotating shaft to the air inlet, and the smoke shield comprises a first smoke shield part and a second smoke shield part respectively located on both sides of the rotating shaft, and the smoke shield has a closed position and a balanced position, wherein when the smoke shield is rotated to the closed position, the air inlet is closed; when the smoke shield is rotated to the balanced position, the air inlet is opened, and the first smoke shield part is spaced apart from and surrounded by an edge of one side of the air inlet to form a first inlet, and the second smoke shield part is spaced apart from and surrounded by an edge of the other side opposite to the air inlet to form a second inlet; and along a thickness direction X of the range hood, the first inlet and the first air path are located at the same end, and the second inlet and the second air path are located at the other opposite end.

[0007] In one embodiment, the flow area of ​​the first air passage is S1, the flow area of ​​the second air passage is S2, the flow area of ​​the first inlet is S3, the flow area of ​​the second inlet is S4, and S1 / S2=S3 / S4. It can be understood that such a configuration makes the size of the air intake capacity between the first inlet and the second inlet match the size of the air intake capacity between the first air passage and the second air passage, which is conducive to further avoiding the formation of turbulence due to the flow of oil smoke between the first air suction duct and the second air suction duct.

[0008] In one embodiment, along the height direction Y of the range hood, the height of the second inlet is greater than the height of the first inlet.

[0009] In one embodiment, when the smoke shield is switched from the closed position to the balanced position, the first smoke shield part is flipped toward the inside of the shell relative to the air inlet, and the second smoke shield part is flipped toward the outside of the shell relative to the air inlet, and S3>S4. It can be understood that such a configuration can minimize the escape of oil smoke from the inside of the shell while ensuring that the oil smoke enters the inside of the shell.

[0010] In one embodiment, K=S4 / S3, and 0.2≤K≤0.5. It can be understood that such a configuration can not only ensure the smoke intake capacity of the second inlet, but also reduce the escape of oil smoke through the second inlet.

[0011] In one embodiment, the smoke shield is configured as a rectangular plate, the first smoke shield portion and the second smoke shield portion are distributed along the length direction of the smoke shield, the extension length of the first smoke shield portion is L1, the extension length of the second smoke shield portion is L2, and L1>L2. It can be understood that, in such a configuration, when the smoke shield rotates from the closed position to the balanced position, the opening of the first inlet is always greater than the opening of the second inlet.

[0012] In one embodiment, L1 / L2=S1 / S2.

[0013] In one embodiment, S1=S3, and S2=S4. This is not only helpful to prevent the oil smoke from flowing between the first air suction duct and the second air suction duct to form turbulence, but also to match the air intake capacity of the front end (first inlet) and the end (first air path) of the first air suction duct, and also to match the air intake capacity of the front end (second inlet) and the end (second air path) of the second air suction duct.

[0014] In one embodiment, the surface area of ​​the first smoke barrier is greater than the surface area of ​​the second smoke barrier, and the center of gravity of the smoke barrier is located at the first smoke barrier; when the smoke barrier is in the closed position and the fan provides suction wind force toward the shell, the smoke barrier can rotate around the shaft to the equilibrium position and stop rotating at the equilibrium position to keep the air inlet open. When the suction wind force disappears, the smoke barrier can fall back to the closed position under the action of its own gravity. It can be understood that with such a setting, the smoke barrier can automatically open or close the air inlet by using the suction wind force provided by the fan without the need for an additional drive device, and the cost is relatively low.

[0015] In one embodiment, a first limit plate and a second limit plate are respectively provided at opposite ends of the air inlet, and when the smoke barrier is in the closed position, along the direction of gravity, the first limit plate stops below the first smoke barrier, and the second limit plate stops above the second smoke barrier. It can be understood that, in this arrangement, the first limit plate 1 is used to limit the first smoke barrier, and the second limit plate is used to limit the second smoke barrier, so that the smoke barrier can be kept in the closed position without rotating around the rotating shaft under the action of its own gravity.

[0016] Compared with the prior art, the range hood provided by the present application has two air suction ducts, namely the first air suction duct and the second air suction duct. The first air suction duct is: first inlet-first air path-fan; the second air suction duct is: second inlet-second air path-fan. And, as the smoke shield rotates around the rotating shaft, the first smoke shield part and the second smoke shield part rotate synchronously in opposite directions to open or close the first inlet and the second inlet at the same time, thereby simultaneously blocking or opening the first air suction duct and the second air suction duct. In other words, compared with the related structure, it is necessary to set up multiple baffles to open or close different inlets, so as to block or open the two air suction ducts, the present application only needs to set up one smoke shield to simultaneously control the two air suction ducts of the range hood to be blocked or opened, thereby simplifying the structure of the range hood. Furthermore, a first inlet and a first air passage are located at the same end, and a second inlet and a second air passage are located at the other opposite end, along a thickness direction X of the range hood, so that the first inlet is connected to the first air passage to form a first suction duct, and the second inlet is connected to the second air passage to form a second suction duct. That is, the air inlet of the range hood is conveniently coordinated with the front and rear air inlets of the fan, and a relatively large distance is maintained between the first suction duct and the second suction duct, which is beneficial to avoid turbulence caused by the smoke flowing between the first suction duct and the second suction duct, thereby affecting the smoke extraction effect and generating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 An axonometric view of the range hood provided for this application;

[0019] Figure 2 A front view of the range hood provided for this application;

[0020] Figure 3 The smoke damper provided for this application is in the closed position Figure 2 Sectional view at AA;

[0021] Figure 4 When the smoke shield provided for this application is in the equilibrium position Figure 2 Section view at AA.

[0022] Figure numerals: 100, range hood; 10, housing; 101, fan frame; 102, smoke hood; 103, first air suction duct; 104, second air suction duct; 11, air inlet; 111, first limit plate; 112, second limit plate; 113, first inlet; 114, second inlet; 12, mating surface; 121, reflective groove; 122, convex portion; 123, notch; 13, first air inlet channel; 14, wind guide plate; 20, smoke shield plate; 21, first smoke shield part; 22, second smoke shield part; 30, rotating shaft; 40, smoke sensor probe; 50, damping rod; 60, fan; 61, first air path; 62, second air path. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0028] See also Figures 1 to 4The present application provides a range hood 100, which includes a shell 10, a fan 60 and a smoke shield 20. The shell 10 is provided with an air inlet 11. The fan 60 is installed inside the shell 10, and one side of the fan 60 is spaced apart from and surrounded by the corresponding inner wall of the shell 10 to form a first air path 61, and the other side opposite to the fan 60 is spaced apart from and surrounded by the corresponding inner wall of the shell 10 to form a second air path 62. The smoke shield 20 is rotatably installed at the air inlet 11 around a rotating shaft 30, and the smoke shield 20 includes a first smoke shield portion 21 and a second smoke shield portion 22 respectively located on both sides of the rotating shaft 30. The smoke shield 20 has a closed position and a balanced position, wherein when the smoke shield 20 is rotated to the closed position, the air inlet 11 is closed; when the smoke shield 20 is rotated to the balanced position, the air inlet is opened, and the first smoke shield 21 is spaced apart from and surrounded by an edge of one side of the air inlet 11 to form a first inlet 113, and the second smoke shield 22 is spaced apart from and surrounded by an edge of the other side opposite to the air inlet 11 to form a second inlet 114. Along the thickness direction X of the range hood 100, the first inlet 113 and the first air passage 61 are located at the same end, and the second inlet 114 and the second air passage 62 are located at the other end opposite to each other.

[0029] It should be noted that the thickness direction X of the range hood 100 is also the front-to-back direction of the range hood. It is understandable that the range hood has two air suction ducts, namely the first air suction duct 103 and the second air suction duct 104. The first air suction duct 103 is: the first inlet 113-the first air path 61-the fan 60; the second air suction duct 104 is: the second inlet 114-the second air path 62-the fan 60. In addition, as the smoke shield 20 rotates around the rotating shaft 30, the first smoke shield 21 and the second smoke shield 22 rotate synchronously in opposite directions to simultaneously open or close the first inlet 113 and the second inlet 114, thereby simultaneously blocking or opening the above two air suction ducts. That is to say, compared with the related structure, which requires setting up multiple baffles to open or close different inlets, thereby partitioning or opening two air suction ducts, the present application only needs to set up one smoke baffle 20 to simultaneously control the partition or opening of the two air suction ducts of the range hood 100, thereby simplifying the structure of the range hood 100. Furthermore, along the thickness direction X of the range hood 100, the first inlet 113 and the first air passage 61 are located at the same end, and the second inlet 114 and the second air passage 62 are located at the other opposite end, so that the first inlet 113 is connected to the first air passage 61 to form the first suction duct 103, and the second inlet 114 is connected to the second air passage 62 to form the second suction duct 104, that is, the air inlet 11 of the range hood 100 is convenient to cooperate with the front and rear air inlets of the fan 60, and a relatively large distance is maintained between the first suction duct 103 and the second suction duct 104, which is conducive to avoiding the formation of turbulence due to the flow of oil smoke between the first suction duct 103 and the second suction duct 104, thereby affecting the oil smoke suction effect of the range hood and the noise generated.

[0030] In one embodiment, please continue to refer to Figure 3 and Figure 4 , the surface area of ​​the first smoke barrier portion 21 is greater than the surface area of ​​the second smoke barrier portion 22, and the center of gravity of the smoke barrier 20 is located at the first smoke barrier portion 21; when the smoke barrier 20 is in the closed position and the fan 60 provides suction wind force toward the shell 10, the smoke barrier 20 can rotate around the rotating shaft 30 to a balanced position and stop rotating at the balanced position to keep the air inlet 11 open, that is, the first inlet 113 and the second inlet 114 are both open. When the suction wind force disappears, the smoke barrier 20 can fall back to the closed position under the action of its own gravity.

[0031] It is understandable that when the smoke shield 20 is in the closed position and the fan 60 provides suction wind force toward the inside of the housing 10, the pressure inside the smoke shield 20 is less than the pressure outside, so that the first smoke shield 21 and the second smoke shield 22 are both subjected to pressure directed to the inside of the housing 10. Since the surface area of ​​the first smoke shield 21 is larger than the surface area of ​​the second smoke shield 22, the pressure F1 on the first smoke shield 21 is greater than the pressure F2 on the second smoke shield 22. Under the pressure difference between the first smoke shield 21 and the second smoke shield 22, the smoke shield 20 rotates around the rotation axis 30, thereby opening the air inlet 11. Specifically, the first smoke shield 21 rotates around the rotation axis 30 toward the inside of the housing 10, and the second smoke shield 22 rotates around the rotation axis 30 toward the outside of the housing 10. Until the smoke shield 20 rotates to the equilibrium position, at this time, the torque of the first smoke shield 21 subjected to the pressure F1, the second smoke shield 22 subjected to the pressure F2 and the smoke shield 20's own gravity G is balanced, so that the smoke shield 20 can stop rotating at the equilibrium position and keep the air inlet 11 open. When the suction wind force disappears, the smoke shield 20 falls back to the closed position under its own gravity and closes the air inlet again. In this way, the smoke shield 20 can automatically open or close the air inlet 11 by using the suction wind force provided by the fan, without the need for an additional drive device, and the cost is relatively low.

[0032] Furthermore, if Figure 2 As shown, the first limiting plate 111 and the second limiting plate 112 are respectively provided at the opposite ends of the air inlet 11. When the smoke barrier 20 is in the closed position, along the height direction Y of the range hood, the first limiting plate 111 stops below the first smoke barrier 21, and the second limiting plate 112 stops above the second smoke barrier 22. The first limiting plate 111 is used to limit the first smoke barrier 21, and the second limiting plate 112 limits the second smoke barrier 22, so that the smoke barrier 20 can be kept in the closed position without further rotating around the rotating shaft 30 under the action of its own gravity.

[0033] Specifically, one end of the first limiting plate 111 is connected to one side edge of the air inlet 11, and the other end extends toward the direction close to the middle of the air inlet 11. Similarly, one end of the second limiting plate 112 is connected to the other side edge opposite to the air inlet 11, and the other end extends toward the direction close to the middle of the air inlet 11. In this way, the contact area between the first limiting plate 111 and the first smoke barrier 21 can be increased, and the contact area between the second limiting plate 112 and the second smoke barrier 22 can be increased. When the smoke barrier 20 is in a balanced position, a first inlet 113 is formed between the first smoke barrier 21 and the first limiting plate 111, and a second inlet 114 is formed between the second smoke barrier 22 and the second limiting plate 112.

[0034] The housing 10 is provided with an air guide plate 14, which is arranged at an angle with the second limiting plate 112 and is used to guide the oil smoke into the second inlet 114. Figure 4 The shell 10 has a mating surface 12 arranged toward the first smoke barrier 21, and the mating surface 12 is used to be spaced apart from and surrounded by the first smoke barrier 21 to form a first air inlet channel 13; as the smoke barrier 20 switches between the closed position and the equilibrium position, the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged.

[0035] It is understandable that, in the case where the matching surface 12 is not provided, when the suction wind force provided by the fan 60 is increased, the first smoke shield 21 further rotates toward the inside of the smoke hood 102, and the opening of the first inlet 113 is further increased. However, the wind speed may decrease because the flow cross-sectional area increases after the oil smoke enters the inside of the smoke hood 102. In other words, although the suction wind force provided by the fan 60 is increased, the wind speed and air flow rate of the first inlet 113 may not increase as expected due to the influence of the flow cross-sectional area. By providing the matching surface 12, the size of the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged. When the suction wind force provided by the fan 60 is increased, the first smoke shield 21 further rotates toward the inside of the smoke hood 102, the opening of the first inlet 113 is further increased, and the size of the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged. Therefore, the wind speed and air flow rate of the air inlet 11 can be increased as expected. That is, by providing the matching surface 12, it is possible to avoid the change of the flow cross-sectional area and the interference with the wind speed. In addition, the matching surface 12 can also guide the oil smoke entering the smoke collecting hood 102, which is conducive to the oil smoke being quickly sucked out by the fan.

[0036] Optionally, the matching surface 12 is configured as an arc surface, and the matching surface 12 is parallel to a movement trajectory of an end surface of one side of the first smoke barrier 21 away from the rotating shaft 30 .

[0037] like Figure 4 As shown, the first smoke barrier 21 is provided with a smoke sensor probe 40, which is used to detect the oil smoke concentration in the first air inlet channel 13; and the fan is configured to increase the suction wind force provided by the fan when the smoke sensor probe 40 detects that the oil smoke concentration in the first air inlet channel 13 is greater than the target value. In this way, the suction wind force of the fan 60 can be adjusted according to the oil smoke concentration in the first air inlet channel 13 detected by the smoke sensor probe 40, so that the oil smoke absorption capacity of the range hood 100 is matched with the oil smoke concentration. Specifically, the smoke sensor probe 40 is detachably mounted on the end surface of the first smoke barrier 21 away from the rotating shaft 30, and is arranged toward the first air inlet channel 13.

[0038] For further information, see Figure 1, a reflective groove 121 is provided on the mating surface 12 corresponding to the smoke sensor probe 40, and the extension direction of the reflective groove 121 is arranged parallel to the rotation track of the smoke sensor probe 40. In this way, the smoke sensor probe 40 can detect the oil fume concentration in the reflective groove 121. It can be understood that since the flow rate of oil fume entering the smoke hood 102 is relatively fast, it is easy to form turbulence. By providing the reflective groove 121, the reflective groove 121 can guide the oil fume, so that the oil fume flowing along the reflective groove 121 is more stable. Therefore, the smoke sensor probe 40 detects the oil fume concentration in the reflective groove 121 more accurately.

[0039] Furthermore, if Figure 1 As shown, a convex portion 122 is provided on the mating surface 12, and the convex portion 122 is provided protruding from the mating surface 12, and the reflective groove 121 is provided on the convex portion 122. Along the gravity direction (the height direction Y of the range hood), a notch 123 connected to the reflective groove 121 is provided at the bottom of the convex portion 122, and the notch 123 is used to allow the oil droplets to flow out of the reflective groove 121 under the action of their own gravity. The convex portion 122 can prevent the oil droplets formed in the first air inlet channel 13 from entering the reflective groove 121, and by providing the notch 123, the oil droplets formed in the reflective groove 121 can be discharged under their own gravity, thereby preventing the oil droplets from gathering in the reflective groove 121 and interfering with the smoke sensor probe 40 detecting the oil smoke concentration in the reflective groove 121. Of course, in other embodiments, the reflective groove 121 can also be provided on the mating surface 12 and recessed relative to the mating surface 12.

[0040] See also Figure 3 The range hood 100 further includes a damping rod 50, and the damping rod 50 is located in the housing 10, and one end of the damping rod 50 is connected to the first smoke shielding portion 21, and the other end is connected to the inner wall of the housing 10. The damping rod 50 can absorb the impact during the opening and closing of the smoke shield 20, thereby reducing the shaking of the smoke shield 20, and can keep the smoke shield 20 stable at the equilibrium position.

[0041] It should be noted that the damping rod 50 is a common mechanical device. The damping rod 50 is widely used in engineering and daily life. The working principle of the damping rod is based on the physical effect of damping. It reduces the vibration amplitude by consuming vibration energy, thereby playing a role in shock absorption and stability. The damping rod 50 includes a damping device and a connecting rod, wherein the damping device can adopt different forms such as liquid damping, gas damping or friction damping. The specific structure of the damping rod 50 is not repeated here.

[0042] Among them, Figure 3As shown, one end of the damping rod 50 is hingedly connected to the first smoke barrier 21, and the other end is hingedly connected to the inner wall of the housing 10. Optionally, the number of damping rods 50 can also be configured to be multiple, and the multiple damping rods 50 are spaced apart along the width direction of the first smoke barrier 21.

[0043] like Figure 1 and Figure 3 As shown, the housing 10 includes a fan frame 101 and a smoke collecting hood 102 which are connected, the fan 60 is installed on the fan frame 101, and the air inlet 11 is opened in the smoke collecting hood 102. Optionally, the first limiting plate 111 and the second limiting plate 112 are integrally bent and formed with the smoke collecting hood 102.

[0044] See also Figure 3 and Figure 4 , the flow area of ​​the first air passage 61 is S1, the flow area of ​​the second air passage 62 is S2, the flow area of ​​the first inlet 113 is S3, and the flow area of ​​the second inlet 114 is S4, and S1 / S2=S3 / S4. It can be understood that the size of the flow area can reflect the size of the air intake capacity. By setting S1 / S2=S3 / S4, the size of the air intake capacity between the first inlet 113 and the second inlet 114 is matched with the size of the air intake capacity between the first air passage 61 and the second air passage 62. In this way, the first inlet 113 and the second inlet 114 can better cooperate with the front and rear air intake of the fan 60, which is conducive to the best effect of the front and rear air intake. In addition, after the oil smoke flows into the interior of the housing 10 from the first inlet 113, it is more inclined to flow toward the first air passage 61, rather than toward the second air passage 62. Similarly, after the oil smoke enters the interior of the housing 10 from the second inlet 114, it is more inclined to flow toward the second air passage 62, rather than toward the first air passage 61. That is, it is helpful to further prevent the oil smoke from flowing between the first air suction duct 103 and the second air suction duct 104 to form turbulence.

[0045] For example, in one embodiment, S1=S3, and S2=S4. In this way, it is not only helpful to prevent the oil smoke from flowing between the first air suction duct 103 and the second air suction duct 104 to form turbulence, but also to match the air intake capacity of the front end (first inlet 113) and the end (first air path 61) of the first air suction duct 103, so that the oil smoke can flow more stably along the first air suction duct 103. Similarly, it can also match the air intake capacity of the front end (second inlet 114) and the end (second air path 62) of the second air suction duct 104, so that the oil smoke can flow more stably along the second air suction duct 104. Of course, in other embodiments, S1 may not be equal to S3, and similarly, S2 may not be equal to S4, as long as S1 / S2=S3 / S4 can be guaranteed.

[0046] Please continue reading Figure 3 and Figure 4 , when the smoke shield 20 switches from the closed position to the balanced position, the first smoke shield 21 flips toward the inside of the housing 10 relative to the air inlet 11, and the second smoke shield 22 flips toward the outside of the housing 10 relative to the air inlet 11, and S3>S4. That is, the first smoke shield 21 opens toward the inside of the housing 10 to form the first inlet 113, and the second smoke shield 22 opens outward to form the second inlet 114, and the second smoke shield 22 opens outward, so that the oil smoke inside the housing 10 can escape outward through the second inlet 114 more easily. By setting S3>S4, the opening of the first inlet 113 is greater than the opening of the second inlet 114, so that while ensuring that the oil smoke enters the inside of the housing 10, the oil smoke inside the housing 10 can be minimized from escaping outward.

[0047] Furthermore, K=S4 / S3, 0.2≤K≤0.5. It is understandable that if K is too small, the second inlet 114 can hardly play the role of allowing oil smoke to enter; if K is too large, it will cause the oil smoke to easily escape outward through the second inlet 114. Therefore, by setting 0.2≤K≤0.5, the smoke intake capacity of the second inlet 114 can be guaranteed, and the oil smoke can be reduced from escaping outward through the second inlet 114. Optionally, the value of K can be 0.2, 0.3, 0.4, 0.45 or 0.5, etc., which can be selected according to actual needs.

[0048] In one embodiment, the smoke shield 20 is configured as a rectangular plate, the first smoke shield portion 21 and the second smoke shield portion 22 are distributed along the length direction of the smoke shield 20, the extension length of the first smoke shield portion 21 is L1, the extension length of the second smoke shield portion 22 is L2, and L1>L2. Setting the smoke shield 20 as a rectangular plate not only makes the smoke shield 20 regular in shape and easy to process, but also facilitates the control of the relative size of the flow area S3 of the first inlet 113 and the flow area S4 of the second inlet 114. Specifically, the value of S3 depends on the width of the first smoke barrier 21 and the distance between the first smoke barrier 21 and the edge corresponding to the air inlet 11, and the value of S4 depends on the width of the second smoke barrier 22 and the distance between the second smoke barrier 22 and the edge corresponding to the air inlet 11. Since the smoke barrier 20 is configured as a rectangular plate, the first smoke barrier 21 and the second smoke barrier 22 have the same width, so the relative size of the flow area S3 of the first inlet 113 and the flow area S4 of the second inlet 114 can be controlled by controlling the distance between the first smoke barrier 21 and the edge corresponding to the air inlet 11, and controlling the distance between the second smoke barrier 22 and the edge corresponding to the air inlet 11. In addition, L1>L2 makes the opening of the first inlet 113 always greater than the opening of the second inlet 114 during the process of the smoke barrier 20 rotating from the closed position to the equilibrium position.

[0049] Optionally, L1 / L2=S1 / S2. It is understandable that, as the smoke shield 20 rotates around the rotating shaft 30, the ratio of S3 to S4 is approximately equal to the ratio of the arc length swept by the first smoke shield 21 to the arc length swept by the second smoke shield 22, that is, approximately equal to the ratio of the extension length L1 of the first smoke shield 21 to the extension length L2 of the second smoke shield 22. That is, by controlling the extension length L1 of the first smoke shield 21 and the extension length L2 of the second smoke shield 22, the size of the air intake capacity between the first inlet 113 and the second inlet 114 can be matched with the size of the air intake capacity between the first air path 61 and the second air path 62.

[0050] Along the height direction Y of the range hood, the height of the second inlet 114 is greater than that of the first inlet 113. That is, the first inlet 113 is closer to the kitchen utensils on the stovetop than the second inlet 114, so that the oil smoke reaches the first inlet 113 first, and the first inlet 113 as the main smoke inlet can absorb most of the oil smoke, and the remaining oil smoke continues to rise upward after escaping and is sucked into the housing 10 from the second inlet 114. In addition, since the second smoke barrier 22 is opened outward to form the second inlet 114, setting the height of the second inlet 114 greater than that of the first inlet 113 is conducive to preventing the second smoke barrier 22 from bumping against the user when it is opened outward, or interfering with the user's cooking operation.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A range hood, characterized in that: The range hood (100) comprises: A housing (10), wherein the housing (10) is provided with an air inlet (11); a fan (60), the fan (60) being installed inside the housing (10), and one side of the fan (60) being spaced apart from and enclosed by the corresponding inner wall of the housing (10) to form a first air passage (61), and the other side of the fan (60) being spaced apart from and enclosed by the corresponding inner wall of the housing (10) to form a second air passage (62); A smoke shield (20), wherein a rotating shaft (30) is provided on the smoke shield (20), and the smoke shield (20) comprises a first smoke shield portion (21) and a second smoke shield portion (22) respectively located on both sides of the rotating shaft (30), the smoke shield (20) is rotatably mounted on the air inlet (11) around the rotating shaft (30), and the smoke shield (20) has a closed position and a balanced position, wherein when the smoke shield (20) is rotated to the closed position, the air inlet (11) is closed; when the smoke shield (20) is rotated to the balanced position, the air inlet is opened, and the first smoke shield portion (21) is spaced apart from one side edge of the air inlet (11) and encloses to form a first inlet (113), and the second smoke shield portion (22) is spaced apart from the other side edge opposite to the air inlet (11) and encloses to form a second inlet (114); Furthermore, along the thickness direction X of the range hood (100), the first inlet (113) and the first air passage (61) are located at the same end, and the second inlet (114) and the second air passage (62) are located at the other opposite end.

2. The range hood according to claim 1, characterized in that: The flow area of ​​the first air passage (61) is S1, the flow area of ​​the second air passage (62) is S2, the flow area of ​​the first inlet (113) is S3, the flow area of ​​the second inlet (114) is S4, and S1 / S2=S3 / S4.

3. The range hood according to claim 2, characterized in that: Along the height direction Y of the range hood, the height of the second inlet (114) is greater than the height of the first inlet (113).

4. The range hood according to claim 3, characterized in that: During the process of the smoke shield (20) switching from the closed position to the balanced position, the first smoke shield portion (21) flips relative to the air inlet (11) toward the inside of the shell (10), and the second smoke shield portion (22) flips relative to the air inlet (11) toward the outside of the shell (10), and S3>S4.

5. The range hood according to claim 2, characterized in that: K=S4 / S3, and 0.2≤K≤0.

5.

6. The range hood according to claim 2, characterized in that: The smoke barrier plate (20) is configured as a rectangular plate, the first smoke barrier portion (21) and the second smoke barrier portion (22) are distributed along the length direction of the smoke barrier plate (20), the extension length of the first smoke barrier portion (21) is L1, the extension length of the second smoke barrier portion (22) is L2, and L1>L2.

7. The range hood according to claim 6, characterized in that: L1 / L2=S1 / S2.

8. The range hood according to claim 2, characterized in that: S1=S3, and S2=S4.

9. The range hood according to claim 1, characterized in that: The surface area of ​​the first smoke barrier portion (21) is greater than the surface area of ​​the second smoke barrier portion (22), and the center of gravity of the smoke barrier plate (20) is located at the first smoke barrier portion (21); When the smoke baffle (20) is in a closed position and the fan (60) provides a suction wind force toward the inside of the shell (10), the smoke baffle (20) can rotate around the rotating shaft (30) to a balanced position and stop rotating at the balanced position so that the air inlet (11) remains open. When the suction wind force disappears, the smoke baffle (20) can fall back to the closed position under the action of its own gravity.

10. The range hood according to claim 8, characterized in that: A first limit plate (111) and a second limit plate (112) are respectively provided at two opposite ends of the air inlet (11); when the smoke shield (20) is in a closed position, along a height direction Y of the range hood, the first limit plate (111) stops below the first smoke shield (21), and the second limit plate (112) stops above the second smoke shield (22).

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