Exhaust duct and extractor hood

Abstract

This application belongs to the field of electrical technology, specifically relating to a smoke exhaust duct and a range hood, aiming to improve the smoke exhaust performance of the range hood to at least a certain extent. The smoke exhaust duct provided in this application, used for smoke exhaust in a range hood, comprises two rigid pipes at an included angle, rigidly connected by a transition elbow, with a flow guide installed within the transition elbow. This application avoids friction loss caused by changes in pipe cross-section, thereby improving the phenomenon of local backflow at pipe bends and enhancing the smoke exhaust performance of the range hood.

Description

Technical Field

[0001] This application belongs to the field of electrical technology, specifically relating to a smoke exhaust duct and a smoke hood. Background Technology

[0002] Range hoods using this technology are typically equipped with exhaust ducts. The exhaust outlet of the range hood connects to a common flue via these ducts, which are often circular, expandable aluminum foil tubes (hereinafter referred to as circular aluminum foil tubes). When unfolded, the circular aluminum foil tube has a corrugated shape, and its cross-sectional area periodically expands and contracts, increasing friction loss during fluid flow. Furthermore, the circular aluminum foil tube often has more than one 90° bend, leading to localized backflow and further increasing the tube's resistance, thus affecting the range hood's exhaust performance. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a smoke exhaust duct and a smoke hood, aiming to improve the smoke exhaust performance of the smoke hood to at least a certain extent.

[0004] The technical solution of this application is as follows:

[0005] On the one hand, this application provides a smoke exhaust duct for use in the exhaust of a range hood. The smoke exhaust duct is characterized by comprising two rigid pipes at an included angle, which are rigidly connected by a connecting elbow. The connecting elbow contains a first guide member arranged along the direction of the flue gas. The distance from the end of the first guide member facing the outlet end of the connecting elbow to the outlet end of the connecting elbow is less than or equal to the distance from the end of the first guide member facing the inlet end of the connecting elbow to the inlet end of the connecting elbow.

[0006] The exhaust duct provided in this application has two adjacent rigid pipes. Since the rigid pipes are non-expandable straight pipes, the friction loss caused by the change of pipe cross-section is avoided, thereby improving the phenomenon of local backflow at pipe corners and improving the exhaust performance of the exhaust fan.

[0007] In addition, since the two adjacent pipes are rigidly connected by a transition elbow, which is fixed in a set position, a flow guide can be installed in the transition elbow of the connecting pipe to improve the flow state at the pipe corner, thereby further improving the phenomenon of local backflow at the pipe corner and enabling the range hood to have better smoke exhaust performance.

[0008] Furthermore, since the distance from the end of the first guide member facing the outlet of the transition bend to the outlet of the transition bend is less than or equal to the distance from the end of the first guide member facing the inlet of the transition bend to the inlet of the transition bend, that is, the first guide member is eccentrically arranged at the outlet of the transition bend, the fluid flow at the outlet of the transition bend is forcibly controlled, the flue gas flow state is improved, and the phenomenon of local backflow at the corner of the pipe is further improved, so that the smoke hood has better smoke exhaust performance.

[0009] In some implementations, two or more first guide elements are spaced apart, and the ends of the two or more first guide elements facing the outlet of the transition elbow are located on the same plane.

[0010] In some implementations, the lengths of the first guide members in the flue gas direction are different, so that the number of first guide members at the outlet end of the transition elbow is greater than the number of first guide members at the inlet end of the transition elbow, so as to further forcibly control the fluid flow at the outlet end of the transition elbow, improve the flue gas flow state, and further improve the phenomenon of local backflow at the corner of the pipe, so that the smoke exhaust fan has better smoke exhaust performance.

[0011] In some embodiments, the transition elbow includes two oppositely arranged sidewalls and two oppositely arranged arc-shaped walls, with the two sides of the two sidewalls connected by the two arc-shaped walls to form a pipe running through the flue gas direction, and the two sides of the first guide member are respectively connected between the two first sidewalls.

[0012] In some implementations, the first guide member is an arc shape concentrically arranged with the first arc-shaped wall, and the central angle of the first guide member is less than or equal to the central angle of the arc-shaped wall.

[0013] In some implementations, the central angle of the arc-shaped wall is 90° so that the transition elbow is a right-angle elbow to accommodate the connection assembly between two pipes whose centerlines are perpendicular to each other and located in the same plane.

[0014] In some implementations, the central angle of the first guide element is 30-90°.

[0015] In some implementations, the central angles of two adjacent first guide elements are not the same along the radial direction of the arc-shaped wall, that is, the lengths of two adjacent first guide elements along the flue gas direction are not the same.

[0016] In some embodiments, the two pipes are rigidly connected by two transition elbows, which are sequentially connected along the flue gas direction. The centerlines of the two transition elbows are perpendicular and located on different planes. That is, the two transition elbows are used to accommodate the connection and assembly between two pipes whose centerlines are perpendicular to each other and not located on the same plane.

[0017] In some implementations, the transition elbow and the pipe located upstream of the flue gas are connected by a direct connector. The direct connector is provided with a through-hole for expanding the flue gas. The inlet end of the flue gas expanding hole is connected to the outlet end of the pipe located upstream of the flue gas. The cross-sectional dimension of the outlet end of the flue gas expanding hole is larger than the cross-sectional dimension of the inlet end of the flue gas expanding hole. The outlet end of the flue gas expanding hole is connected to the inlet end of the first elbow to expand the flow area of ​​the flue gas and further improve the exhaust performance of the flue gas exhaust fan.

[0018] In some implementations, a second guide element is arranged in the flue gas direction within the flue gas expansion hole of the direct head.

[0019] In some implementations, the distance from one end of the second guide member facing the outlet end of the smoke expansion hole to the outlet end of the smoke expansion hole is less than or equal to the distance from one end of the second guide member facing the inlet end of the smoke expansion hole to the inlet end of the smoke expansion hole. This forcibly controls the fluid flow at the outlet end of the direct head, improves the flue gas flow state, and further improves the phenomenon of local backflow at the corner of the pipe, so that the smoke machine has better smoke exhaust performance.

[0020] In some embodiments, two or more second guide members are provided at intervals, and the ends of the two or more second guide members facing the exhaust end of the smoke expansion hole are located on the same plane.

[0021] In some implementations, the lengths of the second guide members in the flue gas direction are different, so that the number of first guide members at the outlet end of the direct head is greater than the number of first guide members at the inlet end of the direct head, in order to further forcibly control the fluid flow at the outlet end of the direct head, improve the flue gas flow state, and further improve the phenomenon of local backflow at the corner of the pipe, so that the smoke exhaust machine has better smoke exhaust performance.

[0022] In some implementations, the pipe has a square cross-section to facilitate the storage of objects.

[0023] In some implementations, the pipeline comprises multiple individual pipelines, which are joined together to form the pipeline.

[0024] On the other hand, this application also provides a range hood, which is special in that the range hood includes the above-mentioned exhaust pipe.

[0025] Smoke hoods with the aforementioned exhaust ducts avoid friction loss caused by changes in duct cross-section, thus improving the local backflow phenomenon at duct bends and enhancing the exhaust performance of the smoke hood. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] In the attached image:

[0028] Figure 1 This is a schematic diagram of the exhaust duct structure according to Embodiment 1 of this application;

[0029] Figure 2 for Figure 1 An internal schematic diagram of a type of transition elbow;

[0030] Figure 3 for Figure 1 An internal diagram of another type of transition elbow;

[0031] Figure 4 This is a schematic diagram of the smoke exhaust duct in Embodiment 2 of this application;

[0032] Figure 5 This is a schematic diagram of the structure of a third type of smoke exhaust duct according to an embodiment of this application;

[0033] Figure 6 for Figure 5 An internal schematic diagram of a type of transition elbow;

[0034] Figure 7 for Figure 5 An internal diagram of another type of transition elbow.

[0035] Figure label:

[0036] Adapter elbow-100, first elbow-110, second adapter elbow-120, straight connector-130, smoke expansion hole-140, pipe-200, first pipe-210, second pipe-220, first adapter valve-300, second adapter valve-400, flow guide-500, first flow guide-510, second flow guide-520, third flow guide-530. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] This application is described below with reference to the accompanying drawings and specific embodiments:

[0041] As society develops, people have increasingly higher requirements for their living environment. The kitchen, as a high-pollution area in the home, is receiving more and more attention, and a healthy and fresh cooking environment is increasingly anticipated. Therefore, the performance requirements for range hoods are becoming increasingly stringent.

[0042] High airflow and high static pressure have become standard features of range hoods. However, with the increase in airflow, the smaller size of the exhaust duct design increases the resistance of the exhaust duct, which in turn increases the noise of the entire unit. In order to reduce the duct resistance, it is necessary to use exhaust ducts with larger diameters. This results in the exhaust duct taking up more kitchen space. If the diameter of the exhaust duct is too large, it will affect the height of the kitchen ceiling, which will affect the user's decoration.

[0043] Furthermore, to improve the smoke extraction efficiency of range hoods, their installation positions have gradually shifted downwards. This has resulted in more and more space above the range hood. Most users do not design cabinets above the range hood, leaving this space unused. Even those who do design cabinets often do so primarily to conceal and decorate the exhaust ducts, with little to no actual storage functionality.

[0044] Furthermore, the exhaust pipes used in range hoods and integrated cooktops currently employ circular, expandable aluminum foil tubes (hereinafter referred to as circular aluminum foil tubes). One end of the circular aluminum foil tube connects to the square-to-round check valve of the range hood, and the other end connects to the check valve of the common flue. Typically, the check valve of the range hood is installed inside the kitchen ceiling, facilitating the concealment of the circular aluminum foil tube. This also contributes to a more aesthetically pleasing overall kitchen appearance. Therefore, when the circular aluminum foil tube is unfolded, its shape is corrugated, and the cross-sectional area inside the tube periodically expands and contracts, with a 90° bend in the middle of the exhaust pipe. Due to the expandability of the circular aluminum foil tube, the location of the bend is relatively flexible; while the exhaust pipe of an integrated cooktop is generally concealed within the kitchen cabinet. Typically, the check valve of an integrated cooktop is located at a relatively low position in the common flue and is fixed by the installer through drilling; therefore, the circular aluminum foil tube usually does not require a bend.

[0045] Circular aluminum foil occupies the same space in both the horizontal and vertical directions of its cross-section. Typically, kitchen wall cabinets are 350mm deep. A 180mm diameter circular aluminum foil tube would occupy nearly half of this space, making it difficult to place larger kitchen utensils. Furthermore, because the exhaust duct of a range hood has a 90° bend, no flow-guiding device can be added at this bend for the circular aluminum foil tube. This results in localized backflow at this location, increasing the pipe resistance and affecting the exhaust performance of the range hood.

[0046] To address the aforementioned technical problems, this application provides a smoke exhaust duct and a range hood, which can effectively reduce the thickness dimension of the smoke exhaust duct to reduce the space occupied by the duct and improve the utilization rate of the user's kitchen space, and appropriately increase the flow area of ​​the smoke exhaust duct to reduce the resistance of the smoke exhaust duct and improve the smoke exhaust performance of the range hood.

[0047] The design concept of this application embodiment is as follows: This application embodiment provides a smoke exhaust pipe for smoke exhaust of a range hood. The smoke exhaust pipe includes multiple rigid pipes connected in sequence. Two adjacent pipes have an included angle, that is, there is a corner between two adjacent pipes. Two adjacent pipes are rigidly connected by a transition elbow, that is, the connecting corner of two adjacent pipes is rigidly connected by a transition elbow. A flow guide is provided inside the transition elbow.

[0048] The exhaust duct provided in this application embodiment is a series of rigid pipes connected in sequence by means of a number of flexible elbows. Since the rigid pipes are non-expandable straight pipes, the friction loss caused by changes in the pipe cross-section is avoided, thereby improving the exhaust performance of the exhaust fan.

[0049] In addition, since the pipe is a rigid pipe, a flow guide can be installed in the bend of the connecting rigid pipe to improve the flow state at the pipe bend, thereby further improving the local resistance loss caused by local backflow at the pipe bend, so that the range hood has better smoke exhaust performance.

[0050] Furthermore, the pipe in this embodiment is preferably made of polyvinyl chloride, which has corrosion resistance. Of course, it can also be made of other materials such as stainless steel, which is not limited here.

[0051] Furthermore, each pipe in this embodiment may include multiple individual pipes, which are spliced ​​together to form a pipe system. This adapts to different installation environments and enhances practicality. In practice, multiple individual pipes can be pre-produced, and then, based on the distance between the exhaust vent of the range hood and the common duct, appropriately sized individual pipes can be selected for assembly.

[0052] Furthermore, in this embodiment, each pipe can be square, preferably rectangular. In practice, one side of the long side of the rectangular pipe can be attached to the side wall of the kitchen, which can reduce the storage space occupied by the pipe and facilitate the storage of larger kitchen utensils in the cabinet, making it more practical.

[0053] In other implementations, the pipes may also be circular or other structural forms, which are not limited here.

[0054] In addition, in this embodiment, a guide member arranged along the flue gas direction is provided inside the transition elbow. The distance from one end of the guide member facing the outlet end of the transition elbow to the outlet end of the transition elbow is less than or equal to the distance from one end of the first guide member facing the inlet end of the transition elbow to the inlet end of the transition elbow. That is, in this embodiment, the guide member has a first end and a second end along the flue gas direction. The first end of the guide member faces the inlet end of the transition elbow, and the second end of the guide member faces the outlet end of the transition elbow. The distance from the first end of the guide member to the inlet end of the transition elbow is greater than or equal to the distance from the second end of the guide member to the outlet end of the transition elbow, thereby allowing the guide member to preferentially approach the outlet end of the transition elbow. This is because when the fluid initially flows through a bend, the force exerted by the outer wall of the bend is relatively small, resulting in a relatively stable flow. As the distance through the bend increases, the force exerted by the outer wall gradually increases, forcibly changing the flow direction and causing the flow at that location to gradually deteriorate until backflow occurs. Therefore, installing a flow guide near the exhaust end of the bend can forcibly control the fluid flow at that location, improve the flow state, and enhance the smoke extraction effect.

[0055] Furthermore, the distance from the first end of the guide member to the air inlet of the transition elbow can be greater than the distance from the second end of the guide member to the air outlet of the transition elbow, meaning the guide member is closer to the air outlet of the transition elbow. Alternatively, the distance from the first end of the guide member to the air inlet of the transition elbow can be equal to the distance from the second end of the guide member to the air outlet of the transition elbow, meaning both ends of the guide member are flush with both ends of the transition elbow.

[0056] In this embodiment of the application, two or more flow guides may be provided at intervals. The ends of the two or more flow guides facing the air outlet of the transition elbow are located on the same plane, so as to forcibly control the fluid flow at the air outlet of the transition elbow, improve the flow state, and improve the smoke exhaust effect.

[0057] When the guide vanes are positioned closer to the outlet of the transition elbow, the lengths of each guide vane in the flue gas direction are not uniform; that is, the number of guide vanes at the outlet of the transition elbow is less than the number at the inlet. This arrangement is because fluid flow is more complex at bends. Flow is more stable near the inlet but becomes more complex at the outlet. Therefore, fewer guide vanes are needed at the inlet of the transition elbow to ensure good fluid flow, while more guide vanes are placed near the outlet to improve pressure distribution and fluid flow in that area, resulting in better flue gas extraction.

[0058] Based on the above design concept, the following specific structures of smoke exhaust ducts are disclosed in the embodiments of this application.

[0059] Example 1:

[0060] Figure 1 This is a schematic diagram of the smoke exhaust duct in Embodiment 1 of this application. Figure 2 for Figure 1 An internal diagram of a type of transition elbow. Figure 3 for Figure 1 An internal diagram of another type of transition elbow. (Combined with...) Figures 1-3 In this embodiment of the application, a first transition elbow 110 is provided. The first transition elbow 110 is preferably a right-angle elbow. Two adjacent pipes 200 are connected through the first transition elbow 110. The center lines of the two adjacent pipes 200 are perpendicular and located on the same plane. That is, the connection between adjacent vertical pipes 200 and horizontal pipes 200 whose center lines are located on the same plane can be realized through the first transition elbow 110.

[0061] Of course, the first transition elbow 110 can also be set to other angles. The appropriate angle of the first transition elbow 110 can be selected according to the installation requirements for the assembly of pipes.

[0062] Specifically, in combination Figure 1 The exhaust duct 200 of this application embodiment may include two rigid ducts 200, namely a first duct 210 arranged vertically and a second duct 220 arranged horizontally. The center lines of the first duct 210 and the second duct 220 are located on the same plane. The air inlet end of the first duct 210 can be connected to the exhaust port of the range hood through a first adapter valve 300. The air outlet end of the first duct 210 is connected to the air inlet end of the second duct 220 through a first adapter elbow 110. The air outlet end of the second duct 220 is connected to the exhaust port of the common flue through a second adapter valve 400.

[0063] In this embodiment, the first transfer valve 300 can be selected as either tilted or centered depending on the outlet position of the smoke hood. Figure 1 The first transfer valve 300 is in an inclined form, which allows the first pipe 210 to fit against the side wall of the kitchen during implementation, thereby reducing the storage space occupied by the pipe 200 and facilitating the storage of larger kitchen utensils in the cabinet, making it more practical.

[0064] Combination Figure 2 as well as Figure 3 In this embodiment of the application, the guide member 500 in the first transition elbow 110 can be set as the first guide member 510. There can be more than one first guide member 510. The first guide member 510 can be plate-shaped or wing-shaped. It can be integrally formed in the first transition elbow 110 along the flue gas direction of the transition elbow 100. When the pipe 200 is rectangular, more than one first guide member 510 can be spaced apart in the first transition elbow 110 of the transition elbow 100 along the length direction of the cross section of the pipe 200.

[0065] Specifically, in combination Figure 2 as well as Figure 3 The first transition elbow 110 of this application embodiment includes two oppositely arranged first sidewalls and two oppositely arranged first arc-shaped walls. The two sides of the two first sidewalls are connected by the two first arc-shaped walls to form a through bend. The two ends of the first guide member are respectively connected between the two first sidewalls. When the first transition elbow is a right-angle elbow, the central angle of the first arc-shaped wall is 90°.

[0066] When the pipe is rectangular, the two opposing first sidewalls can be positioned opposite each other along the length of the pipe's cross-section.

[0067] Combination Figure 2 as well as Figure 3In this embodiment, the first guide member 510 is arc-shaped, with a central angle of 30°-90°, preferably 90°. Furthermore, the first guide member 510 can be concentrically arranged with the first transition elbow 110. That is, the first guide member 510 and the first transition elbow 110 can have the same central angle. When flue gas enters the first transition elbow 110 from the first pipe 210, it can be guided and discharged to the second pipe 220 through the first guide member 510. This improves the flue gas flow at the corner of pipe 200 (first transition elbow 110), avoids local backflow at the corner of pipe 200, and thus gives the range hood better exhaust performance.

[0068] When the central angle of the first guide member 510 is less than 90°, the first guide member 510 is preferably located near the outlet end of the first transition elbow 110. This is because when the fluid initially flows through the elbow, the force exerted by the outer wall of the elbow is relatively small, and the fluid flow is relatively stable. As the distance through the elbow increases, the force exerted by the outer wall of the elbow on the fluid gradually increases, forcibly changing the flow direction of the fluid, causing the flow state at this location to gradually deteriorate until backflow occurs. Therefore, setting a guide member near the outlet end of the first elbow can forcibly control the fluid flow at this location and improve the flow state.

[0069] Furthermore, combined Figure 2 as well as Figure 3 In this embodiment of the application, when there are two or more first guide members 510, the ends of the two or more first guide members 510 near the outlet end of the first transition elbow 110 are located on the same plane. Since the flow of fluid at the bend is more complex, the flow is more stable near the inlet of the bend, but becomes more complex at the outlet. Therefore, a smaller number of guide members can be set at the inlet of the first transition elbow to ensure good fluid flow. Setting more guide members near the outlet of the first transition elbow can improve the pressure distribution and fluid flow state in that area, thereby improving the smoke exhaust effect.

[0070] Combination Figure 3When two or more first guide elements 510 are provided, the central angles of two adjacent first guide elements 510 are different; that is, among two adjacent first guide elements 510, the central angle of one first guide element 510 is larger than the central angle of the other. When there are three or more first guide elements 510, along the radial direction of the first transition elbow 110, the central angles of the nth first guide element 510 are consistent, and the central angles of the (n+1)th first guide element 510 are consistent, where n is a positive integer. This arrangement allows for better fluid flow with fewer guide elements at the inlet of the first transition elbow, while more guide elements near the outlet of the first transition elbow improve the pressure distribution and fluid flow in that area, thereby enhancing the smoke extraction effect.

[0071] Furthermore, combined Figure 3 In this embodiment, the central angle of the nth first guide member 510 is greater than that of the (n+1)th first guide member 510. For example, in this embodiment, three first guide members 510 are provided. The ends of the three first guide members 510 near the air outlet of the first transition elbow 110 are located on the same plane, and the central angles of the first and third first guide members 510 can be 90°, while the central angle of the second first guide member 510 can be 45°.

[0072] In addition, in the embodiments of this application, the nth first guide member 510 may include two single guide members, that is, two single guide members are integrally formed in the first transition elbow 110 to form a first guide member 510, while the (n+1)th first guide member 510 may include only one single guide member.

[0073] It should be noted that the first guide members 510 in the first transition elbow 110 in this embodiment of the application may also be not concentric with the first transition elbow 110, and the angles of the first guide members 510 may also be different, which is not limited here.

[0074] In this embodiment, each component of the exhaust duct 200 can be connected in a sleeved manner and sealed to prevent air and oil leakage from occurring in the exhaust duct 200, thereby improving cleanliness.

[0075] According to fluid mechanics, at the bend of pipe 200, centrifugal force creates high pressure on the outer wall and relatively low pressure on the inner wall. Due to this pressure difference, the fluid flows from high pressure to low pressure, altering the relative flow direction and causing backflow at that location. For a rectangular pipe 200, the flow varies depending on the side length of the bend. Compared to a minor axis bend, a major axis bend results in a smaller distance between the outer and inner walls, leading to stronger flow control at the bend and less flow separation.

[0076] Simulation analysis revealed that, assuming the shorter side of the cross-section of pipe 200 is 'a', when a ≤ 60 mm, there is no obvious vortex at the bend of pipe 200. Therefore, when a ≤ 60 mm, a flow guide structure is not required. However, when 60 mm ≤ a ≤ 100 mm, a significant vortex phenomenon occurs. Therefore, it is recommended that a single flow guide be used in each bend under these conditions. When a ≥ 100 mm, it is suggested that multiple flow guides be used to improve the vortex phenomenon at the bend of pipe 200 and enhance the exhaust performance of the smoke hood.

[0077] Example 2:

[0078] Embodiment 2 of this application provides another type of smoke exhaust duct, which is a further improvement on the transition elbow in Embodiment 1.

[0079] Figure 4 This is a schematic diagram of the smoke exhaust duct according to Embodiment 2 of this application. (In conjunction with...) Figure 4 The transition elbow 100 of the exhaust pipe 200 provided in Embodiment 2 of this application includes the first transition elbow 110 and the direct head 130 described in Embodiment 1. The direct head 130 is provided with a through smoke expansion hole 140. The cross-section of the air inlet end of the smoke expansion hole 140 is consistent with the cross-section of the smoke outlet end of the pipe (first pipe 210) located upstream in the air inlet direction. The air inlet end of the smoke expansion hole 140 is connected to the smoke outlet end of the pipe (first pipe 210) located upstream in the air inlet direction. The cross-section of the air outlet end of the smoke expansion hole 140 is consistent with the cross-section of the air inlet end of the first transition elbow 110. The air outlet end of the smoke expansion hole 140 is connected to the air inlet end of the first transition elbow 110. In this embodiment, the cross-sectional dimension of the exhaust end of the smoke expansion hole 140 is larger than the cross-sectional dimension of the intake end of the smoke expansion hole 140. That is, the size of the smoke expansion hole 140 of the direct head 130 in this embodiment gradually increases along the direction of the flue gas. Through the transition connection of the direct head 130, the flow area of ​​the flue gas can be expanded to further improve the smoke exhaust performance of the smoke machine.

[0080] Combination Figure 4In this embodiment, the arrangement of the first guide member 510 in the first transition elbow 110 can be referred to in Embodiment 1. Embodiment 2 of this application only further describes the direct head 130.

[0081] Combination Figure 4 In this embodiment, the smoke expansion hole 140 of the direct head 130 is provided with one or more second flow guides 520. The one or more second flow guides 520 can be spaced apart in the smoke expansion hole 140 of the direct head 130 along the length direction of the cross section of the pipe 200. The second flow guides 520 can be arranged along the airflow direction in the smoke expansion hole 140. The second flow guides 520 are planar, thereby avoiding the phenomenon of local backflow due to the excessive increase of the flow area of ​​the direct head 130, so that the smoke machine has better smoke exhaust performance.

[0082] If only one second guide element 520 is provided, the second guide element 520 can be located on the center line of the smoke expansion hole 140. If only an even number of second guide elements 520 are provided, the even number of second guide elements 520 can be arranged opposite to the center line of the smoke expansion hole 140. If more than one odd number of second guide elements 520 are provided, one second guide element 520 can be located on the center line of the smoke expansion hole 140, and the remaining second guide elements 520 can be arranged opposite to the center line of the smoke expansion hole 140.

[0083] Furthermore, combined Figure 4 When there are two or more second guide elements 520, the ends of the two or more second guide elements 520 near the exhaust end of the smoke expansion hole 140 are located on the same plane. The length of the second guide element 520 near the center line of the smoke expansion hole 140 is greater than the length of the second guide element 520 away from the center line of the smoke expansion hole 140. This is because: since the size of the smoke expansion hole 140 gradually increases along the airflow direction, if the lengths of all the second guide elements 520 are the same, the gap between the second guide elements 520 at the air inlet end of the smoke expansion hole 140 will be too small. Although it can guide the smoke, it may also cause the resistance at the air inlet end of the smoke expansion hole 140 to increase, affecting the smoke exhaust effect. The design of the length of the second guide element 520 gradually decreasing towards the center line of the smoke expansion hole 140 can avoid the phenomenon of increased resistance at the air inlet end of the smoke expansion hole 140 and improve the smoke exhaust effect.

[0084] Combination Figure 4In this embodiment, the rectangular cross-sectional structure of the outlet end of the first pipe 210 is changed to the rectangular cross-sectional structure of the inlet end of the first transition elbow 110 through the transition of the direct head 130. By adding the second guide member 520 in the direct head 130 and the first guide member 510 in the first transition elbow 110, different flow channels can be formed between the guide members and between the guide members and the corresponding wall surfaces. By the arc-shaped setting of the first guide member in the first elbow and the addition of the second guide member in the form of the straight section of the direct head, the flow velocity at the corner outlet can be effectively controlled, thereby reducing the flow loss caused by the flow mixing formed after each channel due to the different outlet velocities downstream of the corner outlet.

[0085] In this embodiment, the number of second guide members 520 can be referred to the description of Embodiment 1, and will not be repeated here.

[0086] Example 3:

[0087] Figure 5 This is a schematic diagram of the structure of the third type of smoke exhaust duct according to an embodiment of this application. Figure 6 for Figure 5 An internal diagram of a type of transition elbow. Figure 7 for Figure 5 An internal diagram of another type of transition elbow. (Combined with...) Figures 5-7 The transition elbow 100 of the exhaust pipe 200 includes a first transition elbow 110 and a second transition elbow 120 connected sequentially along the flue gas direction. Two adjacent pipes 200 are connected through the first transition elbow 110 and the second transition elbow 120. The center lines of the two adjacent pipes 200 are perpendicular and not located on the same plane. That is, the connection between adjacent vertical pipes 200 and horizontal pipes 200 whose center lines are not located on the same plane can be realized through the interconnected first transition elbow 110 and second transition elbow 120.

[0088] In this application embodiment, both the first transition elbow 110 and the second transition elbow 120 can preferably be 90° elbows. The first transition elbow 110 and the second transition elbow 120 can also be set to other angles. The appropriate angle of the first transition elbow 110 can be selected for the assembly of pipes according to the installation requirements.

[0089] The difference between the smoke exhaust duct 200 shown in Embodiment 3 of this application and the smoke exhaust duct 200 shown in Embodiments 1 and 2 is that the transition elbow shown in the smoke exhaust duct 200 of Embodiment 3 is mainly used for connecting two ducts 200 whose center lines are not coplanar, while the transition elbows shown in Embodiments 1 and 2 are mainly used for connecting two ducts 200 whose center lines are coplanar. In specific implementation, the transition elbow in Embodiment 1, or / and the transition elbow in Embodiment 2, or / and the transition elbow in Embodiment 3 can be reasonably selected for installation according to the construction site, which has better versatility and practicality.

[0090] The first transition elbow 110 in the transition elbow shown in Embodiment 3 of this application can be referred to the description in Embodiment 1, and will not be repeated here. The second transition elbow 120 in the transition elbow shown in Embodiment 3 of this application will now be described.

[0091] Combination Figure 6 as well as Figure 7 In Embodiment 3 of this application, the flow guide 500 can be a third flow guide 530, which can be plate-shaped or airfoil-shaped, and can be integrally formed and disposed in the second transition elbow 120 along the airflow direction of the transition elbow. When the pipe 200 is rectangular, one or more third flow guides 530 can be spaced apart in the second transition elbow 120 along the length direction of the cross-section of the pipe 200.

[0092] Specifically, in combination Figure 6 as well as Figure 7 The second transition elbow 120 in this embodiment has the same structure as the first transition elbow 110, and will not be described again here.

[0093] Combination Figure 6 as well as Figure 7 In this embodiment, the third guide member 530 can also be arc-shaped, with a central angle of 30°-90°, preferably 90°. Furthermore, the third guide member 530 can be concentrically arranged with the second transition elbow 120. That is, the third guide member 530 and the second transition elbow 120 can have the same central angle. When the flue gas enters the second transition elbow 120 from the first transition elbow 110, it can be guided and discharged to the second pipe 220 through the third guide member 530. This improves the flue gas flow at the corner of pipe 200 (second transition elbow 120), avoids local backflow at the corner of pipe 200, and thus gives the range hood better exhaust performance.

[0094] Combination Figure 6 as well as Figure 7When the central angle of the third guide member 530 is less than 90°, the third guide member 530 is preferably located near the outlet end of the second transition elbow 120. This is because when the fluid initially flows through the elbow, the force exerted by the outer wall of the elbow is relatively small, and the fluid flow is relatively stable. As the distance through the elbow increases, the force exerted by the outer wall of the elbow on the fluid gradually increases, forcibly changing the flow direction of the fluid, causing the flow state at this location to gradually deteriorate until backflow occurs. Therefore, setting a guide member near the outlet end of the second transition elbow can forcibly control the fluid flow at this location and improve the flow state.

[0095] Furthermore, combined Figure 6 as well as Figure 7 When there are two or more third guide members 530 in this embodiment, the ends of the two or more third guide members 530 near the outlet of the second transition elbow 120 are located on the same plane. Since the flow of fluid at the bend is more complex, the flow is more stable near the inlet of the bend, but becomes more complex at the outlet. Therefore, a smaller number of guide members can be set at the inlet of the second elbow to ensure good fluid flow. More guide members are set near the outlet of the second transition elbow to improve the pressure distribution and fluid flow state in the vicinity, thereby improving the smoke exhaust effect.

[0096] Combination Figure 7 When two or more third guide elements 530 are provided, the central angles of two adjacent third guide elements 530 are different; that is, among two adjacent third guide elements 530, the central angle of one third guide element 530 is larger than the central angle of the other. Along the radial direction of the second transition elbow 120, when there are three or more third guide elements 530, the central angles of the nth third guide element 530 are consistent, and the central angles of the (n+1)th third guide element 530 are consistent, where n is a positive integer. This arrangement allows for better fluid flow with fewer guide elements at the inlet of the second transition elbow, while more guide elements near the outlet of the second elbow improve the pressure distribution and fluid flow in that area, thereby enhancing the smoke extraction effect.

[0097] Combination Figure 7 In this embodiment, the central angle of the nth third guide member 530 is smaller than the central angle of the (n+1)th third guide member 530. For example, in this embodiment, there are five third guide members 530. The ends of the five third guide members 530 near the outlet of the second transition bend 120 are located on the same plane, and the central angles of the first, third and fifth third guide members 530 can be 45°, and the central angles of the second and fourth first guide members 510 can be 90°.

[0098] In addition, the (n+1)th third guide element 530 may include two single guide elements, that is, two single guide elements are integrally formed in the second transition elbow 120 to form a third guide element 530, while the nth third guide element 530 may include only one single guide element.

[0099] It should be noted that the third guide members 530 in the second transition elbow 120 in this embodiment may not be concentric with the second transition elbow 120, and the angles of the third guide members 530 may also be different, which is not limited here.

[0100] In this embodiment, the number of third guide members 530 can be referred to the description of Embodiment 1, and will not be repeated here.

[0101] Example 4:

[0102] Based on the above embodiments, this application also provides a range hood, which includes the exhaust pipe 200 shown in the above embodiments. The range hood with the exhaust pipe 200 can not only effectively reduce the space occupied by the exhaust pipe in the depth direction of the wall cabinet, but also avoid the friction loss caused by the change of the cross-section of the pipe 200, so as to improve the phenomenon of local backflow at the corner of the pipe 200 and improve the exhaust performance of the range hood.

[0103] Specifically, in this embodiment, the air inlet of the exhaust duct 200 can be connected to the exhaust port of the range hood via a first adapter valve 300, and the air outlet of the exhaust duct 200 can be connected to the inlet of the common flue via a second adapter valve 400. The number of ducts 200 and the selection of adapter elbows can be flexibly selected according to the actual situation, which has good versatility.

[0104] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 according to the specific circumstances.

[0105] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0106] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0107] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0109] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0110] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A smoke exhaust duct, used for smoke exhaust in a range hood, characterized in that, The exhaust duct includes two rigid pipes with an included angle. The two rigid pipes are rigidly connected by a transition elbow. A first guide member is provided inside the transition elbow and arranged along the direction of the flue gas. The distance from the end of the first guide member facing the outlet end of the transition elbow to the outlet end of the transition elbow is less than the distance from the end of the first guide member facing the inlet end of the transition elbow to the inlet end of the transition elbow. The transition elbow and the rigid pipe located upstream of the flue gas are connected by a direct connector. The direct connector is provided with a through-hole for expanding smoke. The inlet end of the smoke expanding hole is connected to the outlet end of the rigid pipe located upstream of the flue gas. The cross-sectional dimension of the outlet end of the smoke expanding hole is larger than the cross-sectional dimension of the inlet end of the smoke expanding hole. The outlet end of the smoke expanding hole is connected to the inlet end of the transition elbow. A second flow guide is arranged in the flue gas direction inside the flue gas expansion hole of the direct head; The distance from one end of the second guide member facing the outlet end of the smoke expansion hole to the outlet end of the smoke expansion hole is less than the distance from one end of the second guide member facing the inlet end of the smoke expansion hole to the inlet end of the smoke expansion hole.

2. The smoke exhaust duct according to claim 1, characterized in that, There are two or more first guide members spaced apart, and the ends of the two or more first guide members facing the air outlet of the transition elbow are located on the same plane.

3. The smoke exhaust duct according to claim 2, characterized in that, The lengths of each of the first guide members in the flue gas direction are different.

4. The smoke exhaust duct according to any one of claims 1-3, characterized in that, The transition elbow includes two oppositely arranged side walls and two oppositely arranged arc-shaped walls. The two sides of the two side walls are respectively connected by the two arc-shaped walls to form a pipe that runs through the flue gas direction. The two sides of the first guide member are respectively connected between the two side walls.

5. The smoke exhaust duct according to claim 4, characterized in that, The first flow guide is an arc shape concentrically arranged with the arc-shaped wall, and the central angle of the first flow guide is less than or equal to the central angle of the arc-shaped wall.

6. The smoke exhaust duct according to claim 5, characterized in that, The central angle of the arc-shaped wall is 90°, so that the transition bend is a right-angle bend.

7. The smoke exhaust duct according to claim 6, characterized in that, The central angle of the first guide element is 30-90°.

8. The smoke exhaust duct according to claim 5, characterized in that, Along the radial direction of the arc-shaped wall, the central angles of two adjacent first guide elements are not the same.

9. The smoke exhaust duct according to any one of claims 5-8, characterized in that, The two rigid pipes are rigidly connected by two transition elbows, which are sequentially connected along the flue gas direction. The center lines of the two transition elbows are perpendicular and located on different planes.

10. The smoke exhaust duct according to claim 1, characterized in that, Two or more second guide members are provided at intervals, and the ends of the two or more second guide members facing the gas outlet of the smoke expansion hole are located on the same plane.

11. The smoke exhaust duct according to claim 10, characterized in that, The lengths of the second guide members in the flue gas direction are different.

12. The smoke exhaust duct according to any one of claims 1-3, 5-8, and 10-11, characterized in that, The rigid pipe has a square cross-section.

13. The smoke exhaust duct according to any one of claims 1-3, 5-8, and 10-11, characterized in that, The rigid pipe comprises multiple individual pipes, which are spliced ​​together.

14. A range hood, characterized in that, The range hood includes the exhaust pipe as described in any one of claims 1-13.

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