Smoke exhaust structure and range hood

Abstract

The invention 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] The present application relates to the field of smoke exhaust technology, and in particular to a smoke exhaust structure and a range hood. Background Art

[0002] In high-rise buildings, the high resistance of public flues can lead to insufficient exhaust pressure in residents' kitchens, resulting in insufficient exhaust air volume. Smoke hoods typically improve exhaust efficiency by increasing air volume or speed. However, this simple and direct approach often results in a significant increase in noise levels, severely impacting kitchen air quality and user experience. Summary of the Invention

[0003] Based on this, it is necessary to provide a smoke exhaust structure and a range hood to address the problem of insufficient kitchen smoke exhaust pressure in high-rise buildings.

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

[0005] In a first aspect, an embodiment of the present application provides a smoke exhaust structure for exhausting oil smoke from a range hood to a common flue, wherein the range hood includes a range hood body, and the smoke exhaust structure includes:

[0006] a smoking channel, one end of which is connected to the range hood body;

[0007] A wind cabinet connected to an end of the smoking passage away from the range hood body;

[0008] a mixed flow fan installed in the wind cabinet; and

[0009] The smoke exhaust channel has one end connected to the end of the wind cabinet away from the smoking channel, and the other end connected to the public flue.

[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 smoke.

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

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

[0013] Through the above design, the smoke intake and exhaust volume of the mixed flow fan are guaranteed, and the exhaust pressure of the oil smoke is maximized.

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

[0015] With the above design, the smoke duct can have a larger oil smoke inlet, so that after being connected to the range hood body, it can absorb the exhaust volume of the range hood body to the maximum extent. In addition, the smoke duct can fit well with the rectangular structure of the range hood body, improving the sealing of the connection.

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

[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] Through the above design, the pressure of oil smoke exhaust is guaranteed to be stable, the output wind speed is guaranteed, and the capacity loss is reduced.

[0019] In one embodiment of the first aspect, an air outlet is provided at one end of the smoking passage away from the range hood body, the air outlet is in a rectangular structure, the lengths of adjacent sides of the air outlet are a and b respectively, and satisfy: D≤a≤1.5D, 0.7D≤b≤D.

[0020] Through the above design, the relationship between the side length of the air outlet and the inlet diameter D of the mixed flow fan is limited, the air volume loss is reduced, and the total outlet pressure is increased.

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

[0022] Through the above design, a sealed connection between each pipe is achieved, and a smooth transition of oil smoke is guaranteed, thereby reducing air volume loss.

[0023] In one embodiment of the first aspect, the smoke exhaust structure further 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 smoking channel, one end of the transition piece is rectangular and the other end is circular, and the rectangular end of the transition piece is connected to the square section, and the circular end is connected to the circular section, and the end of the circular section away from the transition piece is connected to the wind cabinet.

[0024] Through the above design, a smooth transition of oil smoke is ensured and the total pressure at the outlet of the exhaust channel is increased.

[0025] In one embodiment of the first aspect, the smoke exhaust structure further includes a connecting pipe and a transition piece, the connecting pipe is a square tube, and the size of the connecting pipe 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 smoking channel, and the other end is connected to the rectangular end of the transition piece, and the circular end of the transition piece is connected to the smoke exhaust channel.

[0026] Through the above design, the flow channel during the exhaust process of oil smoke is extended, wind loss and resistance are reduced, wind loss is reduced, and the total pressure at the outlet of the exhaust channel is improved.

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

[0028] Through the above design, the cross-sections of the straight pipe section and the arc-shaped section are both rectangular structures, and the cross-sectional dimensions are the same as the air outlet dimensions of the smoking duct, further improving the smoke exhaust pressure.

[0029] In a second aspect, an embodiment of the present application further provides a range hood comprising the smoke exhaust structure described in any of the above embodiments.

[0030] Through the above design, the smoke exhaust efficiency is improved and the smoke exhaust noise in the indoor environment is reduced.

[0031] Compared to related technologies, the present application provides a smoke exhaust structure and a range hood, comprising a smoke duct, an air cabinet, a mixed flow fan, and a smoke exhaust duct. The mixed flow fan is installed within the air cabinet, receiving smoke from the range hood body through the smoke duct and then discharging it through the smoke exhaust duct. This effectively increases the smoke exhaust pressure in the duct and the exhaust volume of the smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0033] Figure 1 This is a schematic structural diagram of the smoke exhaust structure in some embodiments of the present application;

[0034] Figure 2 This is a schematic cross-sectional view of a smoke exhaust structure in some embodiments of the present application;

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

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

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

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

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

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

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

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

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

[0044] Figure 12 This is the cloud map distribution of the smoking opening in Example 6 of this application.

[0045] Description of reference numerals:

[0046] 100. Smoke exhaust structure; 110. Smoke duct; 111. Air outlet; 120. Wind cabinet; 130. Mixed flow fan; 140. Smoke exhaust duct; 150. Transition piece; 160. Connecting pipe; 161. Straight pipe section; 162. Curved section; 163. Square section; 164. Circular section;

[0047] 200, range hood body;

[0048] 300. Public chimney. DETAILED DESCRIPTION

[0049] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0051] In addition, if the term "and / or" appears, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated with each other are in an "or" relationship. If the terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0055] In high-rise buildings, household kitchen fumes must be exhausted to a public flue 300 meters high. However, as the floors rise, the vertical height of the flue increases, and the flue gas must overcome greater gravity during its ascent, resulting in an increase in static pressure differences. When exhausting smoke from low-rise residents, the smoke gas must "climb" a longer distance, and the resistance increases significantly. At the same time, when the number of residents is dense, if the flue cross-sectional area is not designed for the maximum simultaneous exhaust volume, when multiple households use it at the same time, such as during peak cooking hours, the smoke flow rate exceeds the designed capacity, the flow rate accelerates, the dynamic pressure increases, and the resistance rises sharply. In addition, there are also temperature changes and thermal pressure effects, grease blockage and other influences, all of which will lead to increased exhaust resistance and affect exhaust efficiency.

[0056] In related technologies, the smoke exhaust effect is mainly improved by increasing the air volume or wind speed of the smoke exhaust hood. This simple and direct method often leads to a significant increase in noise levels, seriously affecting the kitchen air quality and user experience.

[0057] See Figure 1 As shown, in order to improve the above problems, an embodiment of the present application provides a smoke exhaust structure 100 for exhausting the oil smoke of the range hood to the public flue 300, and effectively improving the problem of insufficient smoke exhaust air volume in high-rise buildings.

[0058] As you can understand, the range hood includes a range hood body 200, which is installed indoors, with its intake located above the kitchen stove to absorb cooking fumes through an internal fan. The exhaust structure 100 is connected to each of the range hood bodies 200 to exhaust the cooking fumes absorbed by the range hood bodies 200 into a common flue 300.

[0059] Continue reading Figure 2 Specifically, the smoke exhaust structure 100 includes a smoke duct 110, a wind cabinet 120, a mixed flow fan 130, and a smoke exhaust duct 140. One end of the smoke duct 110 is connected to the smoke hood body 200, and the other end is connected to the wind cabinet 120. The mixed flow fan 130 is installed in the wind cabinet 120. One end of the smoke exhaust duct 140 is connected to the end of the wind cabinet 120 away from the smoke duct 110, and the other end is connected to the public flue 300.

[0060] Exemplarily, the smoke duct 110 is a hollow channel structure directly connected to the range hood body 200. This guides the fumes absorbed by the range hood body 200 into the fume hood 120, where they are then exhausted to the smoke exhaust duct 140 via the mixed flow fan 130. The fume hood 120 is also a hollow structure, with the mixed flow fan 130 fixedly mounted within it. The length of the fume hood 120 is determined by the length of the mixed flow fan 130, and an air inlet and outlet 111 are reserved at each end of the fume hood 120 for the mixed flow fan 130.

[0061] Mixed flow fan 130 is a cross between axial flow fans and centrifugal fans, combining advantages such as higher air pressure, larger air volume, and higher efficiency. Mixed flow fan 130 can effectively overcome the static pressure resistance of high-rise flues, making it suitable for large-volume smoke exhaust. It requires less installation space than a centrifugal fan, is highly efficient, and operates with relatively low noise. During operation, the negative pressure suction created by mixed flow fan 130 draws fumes from the smoke duct 110 to the exhaust duct 140, increasing the exhaust air volume and accelerating the exhaust of indoor fumes.

[0062] One end of the smoke exhaust channel 140 is directly connected to the end of the wind cabinet 120 away from the smoking channel 110, and the other end is connected to the public flue 300, and forms a sealed channel with the wind cabinet 120, thereby collecting the absorbed oil smoke from the mixed flow fan 130 and discharging it to the public flue 300.

[0063] Furthermore, a noise reduction device, such as sound-absorbing cotton, may be provided in the interlayer area between the mixed flow fan 130 housing and the wind cabinet 120 to further reduce the smoke exhaust noise.

[0064] Furthermore, the wind cabinet 120 is installed above the suspended ceiling along the direction of gravity. The height of the wind cabinet 120 is slightly smaller than the height of the suspended ceiling and can be placed in the upper compartment of the suspended ceiling.

[0065] As you can understand, a suspended ceiling is a decorative feature of a building's living environment. It provides insulation, heat insulation, sound insulation, and sound absorption, and also serves as a concealed layer for electrical, ventilation and air conditioning, communications, fire protection, and alarm pipelines. After the mixed flow fan 130 and wind cabinet 120 are installed on the suspended ceiling, the ceiling's isolation keeps the mixed flow fan 130 away from users, further reducing noise levels within the environment.

[0066] Continue reading Figure 3 As shown, in some embodiments, the height of the suspended ceiling is H and satisfies: 250 mm ≤ H ≤ 350 mm. 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 250 mm, 260 mm, 270 mm, 280 mm, 290 mm, 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, etc., and can be selected based on time requirements and are not specifically limited here. Accordingly, 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 selected based on time requirements and are not specifically limited here, to ensure the maximum smoke intake and exhaust volume of the mixed flow fan 130 and maximize the exhaust pressure of the oil smoke.

[0068] In a set of control experiments, Example 1 adopts a solution in which a multi-blade centrifugal fan is installed in the ceiling wind cabinet 120, and Example 2 adopts a solution in which a mixed flow fan 130 is installed in the ceiling wind cabinet 120. By limiting the air volume of the two embodiments, the total pressure at the outlet of the smoke exhaust duct 140 is obtained, as shown in Table 1 below.

[0069]

[0070] Table 1

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

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

[0073] Specifically, the smoke duct 110 is located within the bottom-mounted range hood body 200, downstream of the smoke outlet of the range hood body 200. The rectangular structure of the smoke duct 110 allows for a larger fume inlet, maximizing the amount of exhaust smoke from the range hood body 200 when connected to the range hood body 200. Furthermore, the rectangular design of the smoke duct 110 allows it to conform to the rectangular structure of the range hood body 200, enhancing the seal of the connection.

[0074] Continue reading Figure 5 As shown, in a specific embodiment, the smoke exhaust structure 100 further includes a connecting pipe 160, the ends of which are respectively connected to the smoke duct 110 and the wind cabinet 120. The connecting pipe 160 is a circular tube 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, connecting pipe 160 serves as a transition duct between smoke duct 110 and wind cabinet 120, directing the oil smoke in smoke duct 110 to mixed flow fan 130. The inner diameter of connecting pipe 160 is the same as the inlet diameter of mixed flow fan 130 to ensure stable exhaust pressure, maintain output wind speed, and minimize power loss.

[0076] See again Figure 3 As shown, in some embodiments, an air outlet 111 is provided at one end of the smoking channel 110 away from the range hood body 200. The air outlet 111 is a rectangular structure, and the 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 duct 110 located outside the range hood body 200 is rectangular in structure to increase the amount of oil smoke discharged from the smoke duct 110. As will be appreciated, the air outlet 111 is also rectangular in structure, with a and b representing 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, air volume 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 selection can be made according to time requirements and is not specifically limited here.

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

[0080] Specifically, the transition piece 150 is a square-to-round transition pipe that connects the square smoke duct to the circular connecting pipe 160 and reduces the pressure loss of oil smoke when the pipe changes diameter. The rectangular end of the transition piece 150 is larger than the circular end, forming a tapered structure that decreases in size from the rectangular end to the circular end. The long side and wide side of the rectangular end of the transition piece 150 are the same as the air outlet 111 of the smoke duct 110, thereby achieving a sealed connection with the smoke duct 110. The circular end of the transition piece 150 and the connecting pipe 160 have the same inner diameter, both of which are the inlet diameter D of the mixed flow fan 130, thereby achieving a sealed connection with the connecting pipe 160 and reducing air volume loss.

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

[0082] Specifically, in this embodiment, the end of the smoke duct away from the range hood body 200 is also provided with a rectangular air outlet 111. A transition piece 150 is disposed in the middle of the connecting pipe 160, which is divided into a square section 163 located upstream of the transition piece 150 and a circular section 164 located downstream of the transition piece 150. The square section 163 and the rectangular end of the transition piece 150 are the same size as the air outlet 111 of the smoke duct 110, while the circular section 164 and the circular end of the transition piece 150 are the same diameter as the inlet diameter D of the mixed flow fan 130, ensuring a smooth transition of oil smoke and increasing the total pressure at the outlet of the smoke exhaust duct 140.

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

[0084] Specifically, in this embodiment, the end of the smoke duct away from the range hood body 200 is also provided with an air outlet 111 of a rectangular structure. Among them, the transition piece 150 is arranged at the tail end of the connecting pipe 160, where the tail end refers to the end of the connecting pipe 160 connected to the wind cabinet 120. The rectangular side length of the connecting pipe 160 is the same as the size of the air outlet 111 of the smoke duct 110, and it extends to the ceiling in a curved manner, extending the circulation channel during the exhaust of oil smoke, reducing wind 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 is the same as the inlet diameter D of the mixed flow fan 130, so as to reduce wind loss and increase the total pressure at the outlet of the smoke exhaust duct 140.

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

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

[0087] In a set of control experiments, four control examples were set up: Example 3, Example 4, Example 5, and Example 6. Each example had a different connector structure for the smoke exhaust structure 100. The total outlet pressure of the smoke exhaust duct 140 was obtained for each of the different smoke exhaust structure 100 embodiments, while maintaining the same limited air volume. The details are shown in Table 2 below.

[0088]

[0089] Table 2

[0090] See Figure 9 As shown, the third embodiment adopts Figure 5The circular connecting pipe 160 structure shown in the figure does not have the transition piece 150 , and the total pressure at the outlet of the smoke exhaust channel 140 is 286.51 Pa.

[0091] See Figure 10 As shown, the fourth embodiment adopts Figure 6 In the circular connecting pipe 160 structure shown, the transition piece 150 is disposed between the connecting pipe 160 and the smoking passage 110 , and the total pressure at the outlet of the smoke exhaust passage 140 is 320.82 Pa.

[0092] See Figure 11 As shown, the fifth embodiment adopts Figure 7 In the connecting pipe 160 structure shown, the transition piece 150 is disposed in the middle of the connecting pipe 160 , and the total pressure at the outlet of the smoke exhaust channel 140 is 318.34 Pa.

[0093] See Figure 12 As shown, the sixth embodiment adopts Figure 8 In the square connecting pipe 160 structure shown, the transition piece 150 is arranged between the connecting pipe 160 and the wind cabinet 120, and the total pressure at the outlet of the smoke exhaust channel 140 is 361.99Pa.

[0094] In summary, compared with Example 3, at the same rotation speed, the air volume of Example 6 increases by 19%, the outlet pressure increases by 26.3%, and the negative pressure range of Example 6 is larger. Example 6 is the optimal pipeline connection method.

[0095] An embodiment of the present application further provides a range hood, comprising the smoke exhaust structure 100 in any of the above embodiments.

[0096] Specifically, the range hood also includes a range hood body 200, and the range hood body 200 can be a 7-shaped, side-suction, top-suction or other structural types, without specific restrictions, and can be well combined with the smoke exhaust structure 100 approved in this application to improve the total pressure at the outlet.

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

[0098] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A smoke exhaust structure for exhausting oil smoke from a range hood to a public flue, wherein the range hood comprises a range hood body, characterized in that: The smoke exhaust structure comprises: a smoking channel, one end of which is connected to the range hood body; A wind cabinet connected to an end of the smoking passage away from the range hood body; a mixed flow fan installed in the wind cabinet; and The smoke exhaust channel has one end connected to the end of the wind cabinet away from the smoking channel, and the other end connected to the public flue.

2. The smoke exhaust structure according to claim 1, characterized in that: The wind cabinet is installed above the ceiling along the direction of gravity. The height of the ceiling is H and meets the following requirements: 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 channel is a rectangular structure.

4. The smoke exhaust structure according to any one of claims 1 to 3, characterized in that: The smoke exhaust structure further includes a connecting pipe, both ends of which are connected to the smoking channel 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: An air outlet is provided at one end of the smoking channel away from the range hood body. The air outlet is in a rectangular structure. The lengths of adjacent sides of the air outlet are a and b respectively, and satisfy the following conditions: 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, and the rectangular end of the transition piece is connected to the smoking channel, and the circular end is connected to the connecting pipe, and 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 smoking 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 wind 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 has the same size as 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 smoking 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 section. One end of the straight pipe section is connected to the smoking channel. The end of the straight pipe section away from the smoking channel is spliced ​​with the arc section at 90°. The end of the arc section away from the straight pipe section is connected to the transition piece.

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

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