Smoke exhaust structure and range hood

Abstract

The utility model relates to a smoke exhaust structure and a range hood, and relates to the technical field of smoke exhaust. The smoke exhaust structure comprises a smoke suction channel, an air cabinet, a mixed flow fan and a smoke exhaust channel; one end of the smoke suction channel is connected with the range hood main body; the air cabinet is connected with one end, far away from the range hood main body, of the smoke suction channel; the mixed flow fan is mounted in the air cabinet; one end of the smoke exhaust channel is connected with the end, away from the smoke suction channel, of the air cabinet, and the other end of the smoke exhaust channel is connected with the public flue. The oil fume exhaust pressure of the channel can be effectively improved, and the oil fume exhaust amount is increased.

Description

Technical Field

[0001] This application relates to the field of smoke extraction technology, and in particular to a smoke extraction structure and a range hood. Background Technology

[0002] In high-rise buildings, the high resistance of shared flues leads to insufficient exhaust pressure in residential kitchens, resulting in inadequate exhaust airflow. Related technologies primarily address this by increasing airflow or velocity in range hoods. However, this simple and direct method often leads to a significant increase in noise levels, severely impacting kitchen air quality and user experience. Utility Model Content

[0003] Therefore, it is necessary to provide a smoke extraction structure and range hood to address the problem of insufficient smoke extraction pressure in kitchens of high-rise buildings.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a smoke exhaust structure for discharging cooking fumes from a range hood into a common flue. The range hood includes a main body, and the smoke exhaust structure includes:

[0006] A smoking duct, one end of which is connected to the main body of the smoke machine;

[0007] A blower unit, which is connected to the end of the smoke extraction channel away from the main body of the range hood;

[0008] A mixed-flow fan, which is installed inside the air handling unit; and

[0009] The smoke exhaust duct has one end connected to the end of the blower unit away from the smoke exhaust duct, and the other end connected to the public smoke duct.

[0010] Through the above design, the mixed-flow fan can effectively increase the exhaust pressure of the channel and increase the exhaust volume of oil fumes.

[0011] In one embodiment of the first aspect, the air handling unit is installed above the suspended ceiling along the direction of gravity, and the height of the suspended ceiling is H, which satisfies: 250mm≤H≤350mm;

[0012] The inlet diameter of the mixed-flow fan is D, and satisfies: D = 0.8H - 0.9H.

[0013] The above design ensures the smoke intake and exhaust volume of the mixed-flow fan, maximizing the exhaust pressure of the oil fumes.

[0014] In one embodiment of the first aspect, the smoking channel is a rectangular structure.

[0015] Through the above design, the smoke extraction channel can have a large-sized fume inlet, so that after connecting with the main body of the range hood, it can absorb the maximum amount of smoke emitted by the main body of the range hood. Furthermore, the smoke extraction channel can fit well with the rectangular structure of the main body of the range hood, improving the sealing of the connection.

[0016] In one embodiment of the first aspect, the smoke exhaust structure further includes a connecting pipe, the two ends of which are respectively connected to the smoke exhaust channel and the mixed flow fan;

[0017] The connecting pipe is a circular pipe structure, and the inner diameter of the connecting pipe is the same as the inlet diameter of the mixed flow fan.

[0018] The above design ensures stable pressure at the exhaust of fumes, maintains consistent output airflow, and minimizes energy loss.

[0019] In one embodiment of the first aspect, the smoke-smoking channel is provided with an air outlet at one end away from the main body of the smoke machine. The air outlet has a rectangular structure, and the side lengths of the adjacent two sides of the air outlet are a and b, respectively, and satisfy: D≤a≤1.5D, 0.7D≤b≤D.

[0020] The above design limits the relationship between the side length of the air outlet and the inlet diameter D of the mixed-flow fan, thereby reducing air volume loss and increasing the total outlet pressure.

[0021] In one embodiment of the first aspect, the smoke exhaust structure further includes a connecting pipe and a transition member, one end of the transition member being rectangular and the other end being circular, wherein the rectangular end of the transition member is connected to the smoke exhaust channel, the circular end of the transition member is connected to the connecting pipe, and the end of the connecting pipe away from the transition member is connected to the mixed flow fan.

[0022] The above design achieves a sealed connection between the pipes and ensures a smooth transition of oil fumes, reducing airflow loss.

[0023] In one embodiment of the first aspect, the smoke exhaust structure further includes a connecting pipe and a transition member. The connecting pipe includes a square segment and a circular segment. The square segment is connected to the smoke exhaust channel. One end of the transition member is rectangular and the other end is circular. The rectangular end of the transition member is connected to the square segment, and the circular end is connected to the circular segment. The end of the circular segment away from the transition member is connected to the fan cabinet.

[0024] The above design ensures a smooth transition of oil fumes and increases the total pressure at the outlet of the exhaust channel.

[0025] In one embodiment of the first aspect, the smoke exhaust structure further includes a connecting pipe and a transition member. The connecting pipe is a square pipe and its size is the same as that of the air outlet. One end of the transition member is rectangular and the other end is circular. One end of the connecting pipe is connected to the smoke exhaust channel, and the other end is connected to the rectangular end of the transition member. The circular end of the transition member is connected to the smoke exhaust channel.

[0026] The above design extends the flow channel during the exhaust process, reduces wind power loss and resistance, and increases the total pressure at the exhaust channel outlet.

[0027] In one embodiment of the first aspect, the connecting pipe includes a straight pipe section and an arc-shaped section, one end of the straight pipe section is connected to the smoking channel, the arc-shaped section is spliced ​​at 90° to the end of the straight pipe section away from the smoking channel, and the end of the arc-shaped section away from the straight pipe section is connected to the transition member.

[0028] With the above design, both the straight pipe section and the arc-shaped section have rectangular cross-sections, and their cross-sectional dimensions are the same as the air outlet dimensions of the smoke extraction channel, further improving the smoke exhaust pressure.

[0029] Secondly, embodiments of this application also provide a range hood, including the smoke exhaust structure described in any of the above embodiments.

[0030] The above design improves smoke extraction efficiency and reduces indoor smoke extraction noise.

[0031] Compared to related technologies, the beneficial effects of this application are as follows: This application provides a smoke exhaust structure and a range hood. The smoke exhaust structure includes a smoke extraction duct, a blower unit, a mixed-flow fan, and a smoke exhaust duct. The mixed-flow fan is installed inside the blower unit, thereby receiving the fumes from the main body of the range hood through the smoke extraction duct and then exhausting them through the smoke exhaust duct. In this way, the mixed-flow fan can effectively increase the smoke exhaust pressure in the duct and increase the exhaust volume of fumes. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 These are schematic diagrams of the smoke exhaust structure in some embodiments of this application;

[0034] Figure 2 This is a cross-sectional structural diagram of the smoke exhaust structure in some embodiments of this application;

[0035] Figure 3 This is a top view of the smoke exhaust structure in some embodiments of this application;

[0036] Figure 4 This is a side view of the smoke exhaust structure in some embodiments of this application;

[0037] Figure 5 This is a schematic diagram of the smoke exhaust structure in a specific embodiment of this application. Figure 1 ;

[0038] Figure 6 This is a schematic diagram of the smoke exhaust structure in a specific embodiment of this application. Figure 2 ;

[0039] Figure 7 This is a schematic diagram of the smoke exhaust structure in a specific embodiment of this application. Figure 3 ;

[0040] Figure 8 This is a schematic diagram of the smoke exhaust structure in a specific embodiment of this application. Figure 4 ;

[0041] Figure 9 This is a cloud map showing the distribution of the smoking port in Embodiment 3 of this application;

[0042] Figure 10 This is a cloud map distribution of the smoking port in Embodiment 4 of this application;

[0043] Figure 11 This is a cloud map showing the distribution of the smoking port in Embodiment 5 of this application;

[0044] Figure 12 This is a cloud map distribution of the smoking port in Embodiment Six of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Smoke exhaust structure; 110. Smoke extraction duct; 111. Air outlet; 120. Air handling unit; 130. Mixed flow fan; 140. Smoke exhaust duct; 150. Transition component; 160. Connecting pipe; 161. Straight pipe section; 162. Arc-shaped section; 163. Square section; 164. Circular section;

[0047] 200. Main body of the range hood;

[0048] 300. Public smoke duct. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the term "and / or" appears, "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] In high-rise buildings, kitchen fumes need to be vented into a shared exhaust duct. As the building rises, the vertical height of the duct increases, forcing the fumes to overcome greater gravitational forces as they ascend, leading to a greater static pressure difference. Lower-floor residents have to "climb" a longer distance, significantly increasing resistance. Furthermore, in densely populated areas, if the duct cross-sectional area is not designed for maximum simultaneous fumes output, multiple households using the duct simultaneously, especially during peak cooking times, will exceed the design capacity, increasing velocity, dynamic pressure, and resistance. Additionally, temperature variations, thermal pressure effects, and grease buildup all contribute to increased exhaust resistance and reduced efficiency.

[0056] In related technologies, the main method to improve smoke extraction is to increase the air volume or wind speed of the exhaust fan. This simple and direct method often leads to a significant increase in noise levels, which seriously affects kitchen air quality and user experience.

[0057] See Figure 1 As shown, in order to improve the above problems, the embodiments of this application provide a smoke exhaust structure 100 for exhausting the oil fumes of the range hood to the public smoke duct 300, and effectively improving the problem of insufficient smoke exhaust volume in high-rise buildings.

[0058] Understandably, a range hood includes a main body 200, which is installed indoors with its intake located above the kitchen stove to absorb cooking fumes via an internal fan. Exhaust structures 100 are connected to the main body 200 to discharge the fumes absorbed by the main body 200 into a common exhaust duct 300.

[0059] Continue reading Figure 2 As shown, specifically, the smoke exhaust structure 100 includes a smoke extraction duct 110, a blower unit 120, a mixed-flow fan 130, and a smoke exhaust duct 140. One end of the smoke extraction duct 110 is connected to the main body of the smoke extraction fan 200, and the other end is connected to the blower unit 120. The mixed-flow fan 130 is installed inside the blower unit 120. One end of the smoke exhaust duct 140 is connected to the end of the blower unit 120 away from the smoke extraction duct 110, and the other end is connected to the common smoke duct 300.

[0060] For example, the smoke extraction duct 110 is a hollow channel structure and is directly connected to the main body of the range hood 200 to guide the oil fumes absorbed by the main body of the range hood 200 to the air handling unit 120, and then exhaust them to the smoke exhaust duct 140 through the mixed-flow fan 130. The air handling unit 120 is also a hollow structure, and the mixed-flow fan 130 is fixedly installed inside the air handling unit 120. The length of the air handling unit 120 is determined according to the length of the mixed-flow fan 130, and the air handling unit 120 has an air inlet and an air outlet 111 for the mixed-flow fan 130 to pass through, respectively.

[0061] The mixed-flow fan 130 falls between an axial flow fan and a centrifugal fan, combining advantages such as higher air pressure, larger air volume, and higher efficiency. The mixed-flow fan 130 effectively overcomes the static pressure resistance of high-rise flues, making it suitable for high-volume smoke exhaust needs. Its installation space requirements are lower than those of centrifugal fans, and it boasts high efficiency and relatively low operating noise. During operation, the mixed-flow fan 130 generates negative pressure suction, drawing fumes from the smoke extraction duct 110 to the exhaust duct 140, increasing the exhaust air volume and accelerating the removal of indoor fumes.

[0062] One end of the exhaust duct 140 is directly connected to the end of the blower 120 away from the smoke extraction duct 110, and the other end is connected to the common flue 300, forming a sealed channel with the blower 120, thereby collecting the absorbed fumes from the mixed flow fan 130 and discharging them into the common flue 300.

[0063] Furthermore, a noise reduction device, such as sound-absorbing cotton, can be installed in the interlayer area between the casing of the mixed-flow fan 130 and the air handling unit 120 to further reduce the smoke exhaust noise.

[0064] Furthermore, the blower unit 120 is installed above the suspended ceiling along the direction of gravity. The height of the blower unit 120 is slightly less than the height of the suspended ceiling, so it can be placed in the upper layer of the suspended ceiling.

[0065] Understandably, a suspended ceiling refers to a decorative element on the top of a building's ceiling, serving functions such as heat insulation, sound insulation, and sound absorption. It also conceals electrical, ventilation, air conditioning, communication, fire protection, and alarm wiring and equipment. After the mixed-flow fan 130 and air handling unit 120 are installed on the suspended ceiling, the ceiling's isolation effect keeps the mixed-flow fan 130 away from users, further reducing the noise level in the environment.

[0066] Continue reading Figure 3 As shown, in some embodiments, the height of the suspended ceiling is H, and satisfies: 250mm≤H≤350mm. The inlet diameter of the mixed-flow fan 130 is D, and satisfies: D=0.8H-0.9H.

[0067] For example, the ceiling height H can be 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, etc., and can be reasonably selected according to time requirements, without being specifically limited here. Correspondingly, the inlet diameter D of the mixed-flow fan 130 can be 0.8H, 0.81H, 0.82H, 0.83H, 0.84H, 0.85H, 0.86H, 0.87H, 0.88H, 0.89H, 0.9H, etc., and can be reasonably selected according to time requirements, without being specifically limited here, to ensure the smoke intake and exhaust volume of the mixed-flow fan 130 and maximize the exhaust pressure of the oil fumes.

[0068] In a set of control experiments, Example 1 adopted a scheme of installing a multi-bladed centrifugal fan in the ceiling-mounted air handling unit 120, and Example 2 adopted a scheme of installing a mixed flow fan 130 in the ceiling-mounted air handling unit 120. By limiting the air volume of the two examples, the total pressure of the exhaust duct 140 outlet was obtained, as shown in Table 1 below.

[0069]

[0070] Table 1

[0071] As can be seen from the simulation calculation, under the same air volume, the outlet pressure of the fan in Example 1 is only 148.19 Pa, while the outlet pressure of Example 2 reaches 286.51 Pa under the same air volume, effectively increasing the outlet pressure by 93.3% and achieving a rapid improvement in the efficiency of oil fume emission.

[0072] Continue reading Figure 4 As shown, in some embodiments, the smoking channel 110 has a rectangular structure.

[0073] Specifically, the smoke extraction channel 110 is located inside the lower-mounted range hood body 200, downstream of the smoke extraction port of the range hood body 200. The rectangular structure of the smoke extraction channel 110 allows for a larger smoke inlet, maximizing the absorption of smoke exhaust from the range hood body 200 after connection. Furthermore, the rectangular design of the smoke extraction channel 110 ensures a good fit to the rectangular structure of the range hood body 200, improving the sealing of the connection.

[0074] Continue reading Figure 5 As shown, in one specific embodiment, the smoke exhaust structure 100 further includes a connecting pipe 160, the two ends of which are connected to the smoke extraction channel 110 and the air handling unit 120, respectively. The connecting pipe 160 is a circular pipe structure, and the inner diameter of the connecting pipe 160 is the same as the inlet diameter of the mixed flow fan 130.

[0075] Specifically, the connecting pipe 160 serves as a transition pipe between the smoke extraction duct 110 and the air handling unit 120, guiding the oil fumes in the smoke extraction duct 110 to the mixed-flow fan 130. Simultaneously, the inner diameter of the connecting pipe 160 is the same as the inlet diameter of the mixed-flow fan 130 to ensure stable pressure at the exhaust of oil fumes, maintain output air velocity, and reduce capacity loss.

[0076] See again Figure 3 As shown, in some embodiments, the smoke extraction channel 110 is provided with an air outlet 111 at one end away from the main body 200 of the smoke machine. The air outlet 111 has a rectangular structure, and the side lengths of the adjacent two sides of the air outlet 111 are a and b, respectively, and satisfy: D≤a≤1.5D, 0.7D≤b≤D.

[0077] Specifically, the portion of the smoke extraction duct 110 located outside the main body 200 of the range hood has a rectangular structure to increase the amount of oil fume discharged from the smoke extraction duct 110. Understandably, the air outlet 111 also has a rectangular structure, where a and b represent the long and wide sides of the air outlet 111, respectively. By limiting the relationship between the side length of the air outlet 111 and the inlet diameter D of the mixed-flow fan 130, airflow loss is reduced and the total outlet pressure is increased.

[0078] For example, the long side a of the air outlet 111 can be D, 1.1D, 1.2D, 1.3D, 1.4D, 1.5D, etc., and the wide side b can be 0.7D, 0.8D, 0.9D, D, etc. The specific value can be reasonably selected according to the time requirements, and no specific limitation is made here.

[0079] Continue reading Figure 6As shown, in a further embodiment, based on the previous embodiment, the smoke exhaust structure 100 also includes a connecting pipe 160 and a transition member 150. One end of the transition member 150 is rectangular, and the other end is circular. The rectangular end of the transition member 150 is connected to the smoke exhaust channel 110, and the circular end is connected to the connecting pipe 160. The end of the connecting pipe 160 away from the transition member 150 is connected to the mixed-flow fan 130.

[0080] Specifically, the transition piece 150 is a square-to-round transition pipe to connect the square smoke extraction duct to the round connecting pipe 160 and reduce pressure loss of fumes when the duct diameter changes. The rectangular end of the transition piece 150 is larger than the circular end, forming a tapered structure that gradually decreases in size from the rectangular end to the circular end. The long and wide sides of the rectangular end of the transition piece 150 are the same as the air outlet 111 of the smoke extraction duct 110 to achieve a sealed connection with the smoke extraction duct 110. The circular end of the transition piece 150 has the same inner diameter as the connecting pipe 160, which is the inlet diameter D of the mixed-flow fan 130, to achieve a sealed connection with the connecting pipe 160 and reduce airflow loss.

[0081] Continue reading Figure 7 As shown, in another specific embodiment, the smoke exhaust structure 100 further includes a connecting pipe 160 and a transition member 150. The connecting pipe 160 includes a square section 163 and a circular section 164. The square section 163 is connected to the smoke exhaust channel 110. One end of the transition member 150 is rectangular and the other end is circular. The rectangular end of the transition member 150 is connected to the square section 163, and the circular end is connected to the circular section 164. The end of the circular section 164 away from the transition member 150 is connected to the mixed flow fan 130.

[0082] Specifically, in this embodiment, the end of the smoke extraction duct away from the main body 200 of the range hood also has a rectangular air outlet 111. The transition member 150 is located in the middle of the connecting pipe 160, which is divided into a square segment 163 upstream of the transition member 150 and a circular segment 164 downstream of the transition member 150. The rectangular ends of the square segment 163 and the transition member 150 are the same size as the air outlet 111 of the smoke extraction duct 110, while the circular ends of the circular segment 164 and the transition member 150 are the same as the inlet diameter D of the mixed-flow fan 130, to ensure a smooth transition of oil fumes and increase the total pressure at the outlet of the exhaust duct 140.

[0083] Continue reading Figure 8As shown, in one specific embodiment, the smoke exhaust structure 100 further includes a connecting pipe 160 and a transition member 150. The connecting pipe 160 is a square pipe, and its size is the same as that of the air outlet 111. One end of the transition member 150 is rectangular, and the other end is circular. One end of the connecting pipe 160 is connected to the smoke exhaust duct 110, and the other end is connected to the rectangular end of the transition member 150. The circular end of the transition member 150 is connected to the smoke exhaust duct 140.

[0084] Specifically, in this embodiment, the end of the smoke extraction duct away from the main body 200 of the range hood also has a rectangular air outlet 111. The transition piece 150 is located at the tail end of the connecting pipe 160, where the tail end refers to the end where the connecting pipe 160 connects to the air handling unit 120. The rectangular side length of the connecting pipe 160 is the same as the size of the air outlet 111 of the smoke extraction duct 110, and it extends in a curved manner to the ceiling, extending the flow path during the exhaust of fumes and reducing wind power loss and resistance. The rectangular end of the transition piece 150 has the same size as the connecting pipe 160, and the circular end of the transition piece 150 has the same inlet diameter D as the mixed-flow fan 130, in order to reduce wind power loss and increase the total pressure at the outlet of the exhaust duct 140.

[0085] Furthermore, the connecting pipe 160 includes a straight pipe section 161 and an arc-shaped section 162. One end of the straight pipe section 161 is connected to the smoke extraction channel 110. The arc-shaped section 162 is spliced ​​at 90° to the end of the straight pipe section 161 away from the smoke extraction channel 110. The end of the arc-shaped section 162 away from the straight pipe section 161 is connected to the transition piece 150.

[0086] Specifically, the straight pipe section 161 is vertically connected to the smoke extraction duct, while the curved section 162 is horizontally positioned, with one end connected to the straight pipe section 161 and the other end extending above the ceiling to connect with the transition piece 150. Understandably, both the straight pipe section 161 and the curved section 162 have rectangular cross-sections, and their cross-sectional dimensions are the same as the dimensions of the air outlet 111 of the smoke extraction duct 110, further increasing the smoke extraction pressure.

[0087] In a set of control experiments, four control examples were set up, namely Example 3, Example 4, Example 5, and Example 6. The connecting structure of the smoke exhaust structure 100 in each example is different. According to the smoke exhaust structure 100 of different implementation methods, under the condition of the same limited air volume, the total pressure of the outlet of the smoke exhaust channel 140 was obtained, as shown in Table 2 below.

[0088]

[0089] Table 2

[0090] See Figure 9 As shown, in Example 3, the following method is used. Figure 5The circular connecting pipe 160 shown has no transition piece 150, and the total pressure at the outlet of its smoke exhaust channel 140 is 286.51 Pa.

[0091] See Figure 10 As shown, in Example 4, Figure 6 The circular connecting pipe 160 structure shown has a transition piece 150 disposed between the connecting pipe 160 and the smoke extraction channel 110, and the total pressure at the outlet of its smoke extraction channel 140 is 320.82 Pa.

[0092] See Figure 11 As shown, Example 5 uses Figure 7 The connecting pipe 160 structure shown has a transition piece 150 located in the middle of the connecting pipe 160, and the total pressure at the outlet of its smoke exhaust channel 140 is 318.34 Pa.

[0093] See Figure 12 As shown, Example 6 adopts Figure 8 The square connecting pipe 160 structure shown has a transition piece 150 disposed between the connecting pipe 160 and the air handling unit 120, and the total pressure at the outlet of its smoke exhaust channel 140 is 361.99 Pa.

[0094] In summary, compared to Example 3, at the same rotation speed, Example 6 has a 19% increase in air volume, a 26.3% increase in outlet pressure, a wider negative pressure range, and is the optimal pipe connection method.

[0095] Embodiments of this application also provide a range hood, including the smoke exhaust structure 100 in any of the above embodiments.

[0096] Specifically, the range hood also includes a main body 200, which can be of various structural types such as L-shaped, side-suction, or top-suction, without any specific restrictions. All of these can be well integrated with the exhaust structure 100 approved in this application to improve the total pressure at the outlet.

[0097] This embodiment has the smoke exhaust structure 100 of any of the above embodiments, and therefore has all the beneficial effects of the smoke exhaust structure 100 of any of the above embodiments, which will not be described in detail here.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0099] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A smoke exhaust structure for exhausting cooking fumes from a range hood to a common flue, the range hood comprising a main body, characterized in that, The smoke exhaust structure includes: A smoking duct, one end of which is connected to the main body of the smoke machine; A blower unit, which is connected to the end of the smoke extraction channel away from the main body of the range hood; A mixed-flow fan, which is installed inside the air handling unit; and The smoke exhaust duct has one end connected to the end of the blower unit away from the smoke exhaust duct, and the other end connected to the public smoke duct.

2. The smoke exhaust structure according to claim 1, characterized in that, The air handling unit is installed above the suspended ceiling along the direction of gravity, and the height of the suspended ceiling is H, which satisfies: 250mm≤H≤350mm; The inlet diameter of the mixed-flow fan is D, and satisfies: D = 0.8H - 0.9H.

3. The smoke exhaust structure according to claim 1, characterized in that, The smoking passage has a rectangular structure.

4. The smoke exhaust structure according to any one of claims 1 to 3, characterized in that, The smoke exhaust structure also includes a connecting pipe, the two ends of which are connected to the smoke exhaust duct and the mixed flow fan, respectively. The connecting pipe is a circular pipe structure, and the inner diameter of the connecting pipe is the same as the inlet diameter of the mixed flow fan.

5. The smoke exhaust structure according to claim 3, characterized in that, The smoke extraction channel has an air outlet at one end away from the main body of the smoke machine. The air outlet has a rectangular structure, and the side lengths of the adjacent two sides of the air outlet are a and b, respectively, and satisfy: D≤a≤1.5D, 0.7D≤b≤D.

6. The smoke exhaust structure according to claim 5, characterized in that, The smoke exhaust structure also includes a connecting pipe and a transition piece. One end of the transition piece is rectangular and the other end is circular. The rectangular end of the transition piece is connected to the smoke exhaust channel, and the circular end is connected to the connecting pipe. The end of the connecting pipe away from the transition piece is connected to the mixed flow fan.

7. The smoke exhaust structure according to claim 5, characterized in that, The smoke exhaust structure also includes a connecting pipe and a transition piece. The connecting pipe includes a square section and a circular section. The square section is connected to the smoke exhaust channel. One end of the transition piece is rectangular and the other end is circular. The rectangular end of the transition piece is connected to the square section, and the circular end is connected to the circular section. The end of the circular section away from the transition piece is connected to the fan cabinet.

8. The smoke exhaust structure according to claim 5, characterized in that, The smoke exhaust structure also includes a connecting pipe and a transition piece. The connecting pipe is a square pipe and its size is the same as that of the air outlet. One end of the transition piece is rectangular and the other end is circular. One end of the connecting pipe is connected to the smoke exhaust channel, and the other end is connected to the rectangular end of the transition piece. The circular end of the transition piece is connected to the smoke exhaust channel.

9. The smoke exhaust structure according to claim 8, characterized in that, The connecting pipe includes a straight pipe section and an arc-shaped section. One end of the straight pipe section is connected to the smoking channel, and the end of the straight pipe section away from the smoking channel is spliced ​​to the arc-shaped section at a 90° angle. The end of the arc-shaped section away from the straight pipe section is connected to the transition piece.

10. A range hood, characterized in that, The smoke exhaust structure includes any one of claims 1 to 9.

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