Smoke pipe and range hood assembly comprising same

Abstract

The utility model provides a smoke pipe and a range hood assembly comprising the same, the smoke pipe sequentially comprises a first straight section, a bent section and a second straight section in the smoke flowing direction, and the tail end of the first straight section is used for being connected with a range hood. The pipeline diameter of the tail end of the first straight section is defined as D1, the pipeline diameter of the bent section is defined as D2, the pipeline diameter of the tail end of the second straight section is defined as D3, D1 is smaller than D2, D3 is smaller than D2, the pipeline diameter of the part of the first straight section is gradually increased in the flue gas flowing direction, and the pipeline diameter of the part of the second straight section is gradually decreased in the flue gas flowing direction. By means of the structural arrangement scheme, the purpose of noise reduction can be achieved, flow resistance can be reduced, and the problem of secondary noise derivation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a smoke pipe and a range hood component comprising the smoke pipe. Background Art

[0002] At present, the exhaust pipes used in range hoods usually include aluminum foil pipes and stainless steel pipes. Aluminum foil pipes are widely used because of their low cost, flexible bending, easy folding and transportation. However, since the aluminum foil pipe is easily wrinkled when it is folded inward, and during the use of the user's home, the actual effective diameter of the pipe is often smaller than the designed diameter due to wrinkles at the bend of the pipe body. In particular, most of the aluminum foil pipes in the user's home need a right-angle turn to connect to the external check valve, and most of the excess pipes are directly folded and stretched together and tied with tape, which will cause the actual pipe diameter to be smaller than the designed diameter, thereby increasing the outlet resistance, the motor speed of the range hood, and the noise. At the same time, the inward wrinkling method is easy to derive secondary noise, that is, the noise caused by the fluid turbulence caused by the inward wrinkling in the pipe. Although the stainless steel pipe does not have the problem of the actual pipe diameter being smaller than the designed diameter due to internal wrinkles, it is not conducive to widespread use due to the high cost and complex processing technology of stainless steel pipes. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect that the aluminum foil tube in the prior art is easy to generate noise, and to provide a smoke tube and a range hood assembly containing the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A smoke pipe, which includes a first straight section, a curved section and a second straight section in sequence along the direction of smoke flow, the end of the first straight section is used to connect to a range hood, and the pipe diameter at the end of the first straight section is defined as D 1 The pipe diameter of the curved section is D 2 The pipe diameter at the end of the second straight section is D 3 , D 1 <D 2 And D 3 <D 2 The pipe diameter of the first straight section gradually increases along the direction of smoke flow, and the pipe diameter of the second straight section gradually decreases along the direction of smoke flow.

[0006] The smoke duct achieves the purpose of noise reduction at the end of the first straight section for connecting to the range hood smaller than the pipe diameter of the curved section by expanding the pipe diameter along the gas flow direction, thereby reducing the operating noise compared to the existing smoke duct.

[0007] At the same time, the location for expanding the pipe diameter is selected to include the curved section of the smoke pipe, so as to solve the problem that the current smoke pipe has a smaller diameter at the curved section due to the influence of pipe folds, has greater resistance, and is prone to secondary noise.

[0008] In addition, by making the pipe diameter at the end of the second straight section of the smoke pipe smaller than the pipe diameter of the curved section, the problem of difficulty in docking with the existing check valve interface due to the excessively large diameter of the end of the second straight section can be avoided while expanding the pipe diameter of the curved section, thereby improving the compatibility of the smoke pipe.

[0009] Preferably, the smoke tube is an aluminum foil tube, and the smoke tube comprises a metal threaded frame and an aluminum foil film wrapped on the surface of the metal threaded frame.

[0010] Compared with other materials used to wrap the metal threaded frame of the smoke pipe, the cost and reliability of wrapping with aluminum foil film are higher, and the weight of the smoke pipe can be effectively reduced. In addition, the aluminum foil tube formed by wrapping the metal threaded frame with aluminum foil film is convenient to fold and pack, which effectively saves the space required for packaging.

[0011] Preferably, the thread pitch of the metal thread frame corresponding to the pipe diameter change area of ​​the smoke pipe is defined as S 1 The thread pitch of the metal thread frame corresponding to other areas except the pipe diameter change area is S 2 , where S 1 <S 2 .

[0012] By relatively increasing the thread pitch in the pipe diameter change area, the support performance of the metal thread frame on the aluminum foil membrane is improved, further reducing the noise generation. At the same time, the thread pitch in other areas is larger than the thread pitch in the pipe diameter change area, which can reduce material cost and weight.

[0013] Preferably, the thread pitches of the metal threaded frame corresponding to other regions except the pipe diameter changing region are all equal.

[0014] The manufacturing difficulty is reduced by making the thread pitches of the metal thread frame in other areas except the pipe diameter reduction area equal.

[0015] Preferably, the pipe diameter D of the curved section is 2 The value range is 1.2D 1 ~1.5D 1 between

[0016] By controlling the pipe diameter of the curved section, the pipe diameter D of the curved section is 2The value range of is between 1.2 times the pipe diameter at the end of the first straight section and 1.5 times the pipe diameter at the end of the first straight section, which can improve the noise reduction effect of the smoke duct.

[0017] Preferably, the pipe diameter-changing position of the second straight section is arranged at a middle position of the second straight section.

[0018] By setting the pipe diameter change position of the second straight section at the middle position of the second straight section, it is possible to avoid the pipe diameter change position of the second straight section being too close to the curved section, thereby avoiding the noise caused by the diameter reduction at a position too close to the curved section. At the same time, the noise generated at this location can be relatively far away from the user, reducing the impact on the user.

[0019] At the same time, by setting the pipe diameter change position of the second straight section at the middle position of the second straight section, it can avoid the pipe diameter change position of the second straight section being too close to the end of the second straight section, thereby reducing the material used in the smoke pipe and further reducing costs.

[0020] Preferably, the minimum distance from the diameter change position of the second straight section to the curved section is defined as L 1 , L 1 >3D 2 .

[0021] By controlling the minimum distance from the diameter changing position of the second straight section to the curved section so that the minimum distance is greater than 3 times the pipe diameter D2 of the curved section, it is possible to avoid the diameter changing position of the second straight section being too close to the curved section, thereby avoiding the noise caused by the diameter becoming smaller at a position too close to the curved section. At the same time, the noise generated at this location can be relatively far away from the user, reducing the impact on the user.

[0022] Preferably, the minimum distance from the diameter change position of the second straight section to the curved section is defined as L 1 , L 1 <5D 2 .

[0023] By controlling the minimum distance from the diameter-changing position of the second straight section to the curved section so that the minimum distance is less than 5 times the pipe diameter D2 of the curved section, it is possible to avoid the diameter-changing position of the second straight section being too close to the end of the second straight section, thereby reducing the material used in the smoke pipe and further reducing costs.

[0024] Preferably, the pipe diameter D at the end of the first straight section is 1 The pipe diameter D at the end of the second straight section 3 equal.

[0025] By making the pipe diameter at the end of the first straight section equal to the pipe diameter at the end of the second straight section, the specifications and sizes are unified, thereby reducing the manufacturing difficulty.

[0026] Preferably, the pipeline diameter at the end of the second straight section matches the interface size of the connected check valve.

[0027] By matching the pipeline diameter at the end of the second straight section with the interface size of the check valve, the purpose of reliably connecting the end of the second straight section to the check valve is achieved.

[0028] A range hood assembly, comprising:

[0029] A range hood having a smoke exhaust port;

[0030] As for the smoke pipe as described above, the end of the first straight section of the smoke pipe is butted against the smoke exhaust port.

[0031] The positive and progressive effects of the utility model are:

[0032] (1) The smoke duct achieves noise reduction at the end of the first straight section for connecting to the range hood by making the pipe diameter smaller than the pipe diameter of the curved section, thereby reducing the noise in use compared with the existing smoke duct.

[0033] (2) The location where the diameter of the smoke pipe is expanded is selected to include the curved section of the smoke pipe, which can solve the problem that the current smoke pipe has a smaller diameter at the curved section due to the influence of pipe folds, has greater resistance, and is prone to secondary noise.

[0034] (3) The pipe diameter at the end of the second straight section of the smoke pipe is smaller than the pipe diameter of the curved section, which can avoid the problem of difficulty in docking with the existing check valve interface due to the large diameter of the end of the second straight section, thereby improving the compatibility of the smoke pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic structural diagram of an aluminum foil tube according to an embodiment of the present invention.

[0036] Figure 2 The figure is a schematic diagram of the connection relationship between the aluminum foil tube and the range hood according to one embodiment of the utility model.

[0037] Figure 3 This is a schematic structural diagram of an aluminum foil tube according to an embodiment of the utility model after the curved section is straightened.

[0038] Figure 4 It is a schematic structural diagram of the metal threaded frame of the aluminum foil tube in one embodiment of the utility model at the curved section and the second straight section.

[0039] Description of reference numerals:

[0040] Aluminum foil tube 10

[0041] First straight segment 1

[0042] Bending section 2

[0043] Second straight section 3

[0044] Metal thread frame 4

[0045] Range hood 20 DETAILED DESCRIPTION

[0046] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0047] The utility model provides an aluminum foil tube 10, which specifically includes a metal thread frame and an aluminum foil film wrapped on the surface of the metal thread frame. Figure 1 to Figure 3 As shown, one end of the aluminum foil tube 10 is connected to the smoke outlet of the range hood 20, and includes a first straight section 1, a curved section 2, and a second straight section 3 in sequence along the smoke flow direction. Among them, the end 1a of the first straight section 1 is used to connect the range hood 20. There are pipeline diameter reduction areas in both the first straight section 1 and the second straight section 3. Specifically, the pipeline diameter of the first straight section 1 gradually increases along the smoke flow direction, while the pipeline diameter of the second straight section 3 gradually decreases along the smoke flow direction, so that the pipeline diameter D at the end 1a of the first straight section 1 is 1 Smaller than the pipe diameter D of the curved section 2 2 At the same time, the pipe diameter D of the end 3a of the second straight section 3 3 It is also smaller than the pipe diameter D of the curved section 2. 2 .

[0048] The aluminum foil tube 10 achieves the purpose of noise reduction at the end 1a of the first straight section 1 for connecting to the range hood 20 by making the pipe diameter smaller than the pipe diameter of the curved section 2, thereby expanding the pipe diameter along the gas flow direction, thereby reducing the usage noise compared to the current aluminum foil tube 10.

[0049] At the same time, the location for expanding the pipeline diameter is selected to include the curved section 2 of the aluminum foil tube 10 to solve the problem that the current aluminum foil tube 10 has a smaller diameter at the curved section 2 due to the influence of pipeline wrinkles, has greater resistance, and is prone to secondary noise.

[0050] In addition, by making the pipe diameter of the end 3a of the second straight section 3 of the aluminum foil tube 10 smaller than the pipe diameter of the curved section 2, the pipe diameter of the curved section 2 is expanded, and the problem of the end 3a of the second straight section 3 being difficult to dock with the existing check valve interface due to the excessively large diameter is avoided, thereby improving the compatibility of the aluminum foil tube 10. Specifically, in this embodiment, the pipe diameter of the end 3a of the second straight section 3 should match the interface size of the check valve, so as to achieve the purpose of reliably docking the end 3a of the second straight section 3 with the check valve.

[0051] Of course, in other embodiments, the above scheme can also be applied to other smoke tubes including the aluminum foil tube 10, so as to achieve a series of problems such as reducing operating noise, reducing flow resistance, and avoiding the generation of secondary noise by adjusting the pipe diameter of each section of the smoke tube.

[0052] The amount of sound attenuation ΔL brought about by enlarging the diameter of the curved section 2 of the aluminum foil tube 10 and its adjacent area can be calculated by the following formula:

[0053]

[0054] Where, m is the expansion ratio, m = D 2 / D 1

[0055] D 1 ——Pipeline diameter before expansion;

[0056] D 2 ——pipeline diameter after expansion;

[0057] L 2 ——the length of the pipeline in the expansion section;

[0058] K——wave number, k=2πf / c.

[0059] Therefore, by expanding the diameter of the pipeline along the gas flow direction, the noise reduction effect is achieved in the curved section 2 and its adjacent area, so as to reduce the noise in use compared with the current aluminum foil tube 10 and reduce the noise impact caused by the inner wrinkles of the aluminum foil film. 2 The preferred value range should be between 500mm and 1000mm to avoid the expansion section pipeline length being too short and affecting the noise reduction and silencing effect, and to avoid the expansion section pipeline length being too long and resulting in an increase in material consumption and affecting costs.

[0060] Preferably, the pipe diameter D of the curved section 2 is 2 The value range is 1.2D 1 ~1.5D 1 Between, the diameter D of the pipeline passing through the control bend 2 2 , which serves to improve the noise reduction effect of the aluminum foil tube 10. More preferably, the pipe diameter D of the curved section 2 is 2 You can directly select 1.2D 1 , which is 1.2 times the pipe diameter at the end 1a of the first straight section 1. However, it should be noted that the pipe diameter D 2 The maximum value should not be greater than 240 mm to avoid the pipe diameter of the curved section 2 being too large and affecting the installation in the cabinet.

[0061] like Figure 2 As shown, in this embodiment, the pipe diameter change position of the second straight section 3 is set at the middle position of the second straight section 3. This structural setting scheme can prevent the pipe diameter change position of the second straight section 3 from being too close to the curved section 2, thereby avoiding the noise caused by the diameter becoming smaller at a position too close to the curved section 2. At the same time, the noise generated at this position can be relatively far away from the user, reducing the impact on the user.

[0062] Specifically, the minimum distance L from the diameter change position of the second straight section 3 to the curved section 2 is 1 Also related to the pipe diameter D of the curved section 2 2 More preferably, the minimum distance L 1 The value range is controlled in 3D 2 ~5D 2 In which, by controlling the minimum distance from the diameter change position of the second straight section 3 to the curved section 2, the minimum distance is greater than 3 times the pipe diameter D of the curved section 2. 2 , it can prevent the pipe diameter change position of the second straight section 3 from being too close to the curved section 2, thereby avoiding the noise caused by the diameter becoming smaller at a position too close to the curved section 2. At the same time, the noise generated at this position can be relatively far away from the user, reducing the impact on the user. By controlling the minimum distance from the diameter change position of the second straight section 3 to the curved section 2, the minimum distance is less than 5 times the pipe diameter D of the curved section 2. 2 , it can be avoided that the pipe diameter change position of the second straight section 3 is too close to the end 3a of the second straight section 3, thereby reducing the material used for the aluminum foil tube 10 and further reducing the cost.

[0063] In addition, in this embodiment, in order to unify the specifications and reduce the manufacturing difficulty, the pipe diameter D of the end 1a of the first straight section 1 is 1 The pipe diameter D of the end 3a of the second straight section 3 3 Equal. Among them, D 1 With D 3 The preferred size choices are 160mm, 180mm and 200mm.

[0064] In this embodiment, the smoke pipe is specifically an aluminum foil tube 10, which is formed by wrapping an aluminum foil film on the surface of a metal threaded frame 4 to form a pipe structure of the smoke pipe. The metal threaded frame 4 is a spiral structure wound by a metal wire in a circumferential direction, wherein the thread spacing of the metal threaded frame 4 is different at different locations.

[0065] like Figure 4 As shown, the thread pitch of the metal thread frame 4 corresponding to the pipe diameter change area of ​​the smoke pipe is S 1 The thread pitch corresponding to other areas except the pipe diameter reduction area is S 2 In this embodiment, S1 is less than S 2 By relatively increasing the thread pitch in the pipe diameter changing area, the support performance of the metal thread frame 4 on the aluminum foil film in this area is improved, and the noise generation is further reduced. At the same time, the thread pitch in other areas is larger than the thread pitch in the pipe diameter changing area, which can reduce the material cost and weight. In addition, in order to reduce the manufacturing difficulty, the thread pitch in other areas of the metal thread frame 4 except the pipe diameter changing area (i.e., S 2 For example, in this embodiment, the thread pitch S of other areas on the left and right sides of the pipe diameter reduction area is equal to the thread pitch S of other areas on the left and right sides of the pipe diameter reduction area. 2 are equal.

[0066] This embodiment also provides a range hood assembly, such as Figure 2 As shown, the range hood 20 and the above-mentioned aluminum foil tube 10 are connected by connecting the end 1a of the first straight section 1 of the aluminum foil tube 10 with the smoke outlet of the range hood 20, so as to achieve the purpose of noise reduction through the aluminum foil tube 10, and at the same time reduce the flow resistance and avoid the problem of secondary noise. Of course, in other embodiments, other types of smoke pipes using the above-mentioned structural setting scheme can also be connected with the smoke outlet of the range hood 20, which can also achieve the purpose of noise reduction, reduce the flow resistance and avoid the problem of secondary noise.

[0067] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A smoke pipe, which comprises a first straight section, a curved section and a second straight section in sequence along the direction of smoke flow, wherein the end of the first straight section is used to connect to a range hood, characterized in that: The pipe diameter at the end of the first straight section is defined as D1, the pipe diameter of the curved section is defined as D2, and the pipe diameter at the end of the second straight section is defined as D3, D1<D2 and D3<D2, the pipe diameter of the first straight section gradually increases along the direction of smoke flow, and the pipe diameter of the second straight section gradually decreases along the direction of smoke flow.

2. The smoke pipe according to claim 1, characterized in that: The smoke pipe is an aluminum foil pipe, and comprises a metal threaded frame and an aluminum foil film wrapped on the surface of the metal threaded frame.

3. The smoke pipe according to claim 2, characterized in that: The thread pitch of the metal threaded frame corresponding to the pipe diameter changing area of ​​the smoke pipe is defined as S1, and the thread pitch of the metal threaded frame corresponding to other areas except the pipe diameter changing area is defined as S2, wherein S1<S2.

4. The smoke pipe according to claim 3, characterized in that: The thread pitches of the metal thread frame corresponding to other areas except the area where the pipeline changes diameter are all equal.

5. The smoke tube according to any one of claims 1 to 4, characterized in that: The value range of the pipeline diameter D2 of the curved section is between 1.2D1 and 1.5D1.

6. The smoke pipe according to any one of claims 1 to 4, characterized in that: The pipe diameter change position of the second straight section is arranged at the middle position of the second straight section.

7. The smoke pipe according to any one of claims 1 to 4, characterized in that: The minimum distance from the diameter change position of the second straight section to the curved section is defined as L1, where L1>3D2; And / or, define the minimum distance from the diameter change position of the second straight segment to the curved segment as L1, L1<5D2.

8. The smoke tube according to any one of claims 1 to 4, characterized in that: The pipe diameter D1 at the end of the first straight section is equal to the pipe diameter D3 at the end of the second straight section.

9. The smoke tube according to any one of claims 1 to 4, characterized in that: The pipeline diameter at the end of the second straight section matches the interface size of the connected check valve.

10. A range hood assembly, characterized in that: It includes: A range hood having a smoke exhaust port; The smoke pipe according to any one of claims 1 to 9, wherein the end of the first straight section of the smoke pipe is butted against the smoke exhaust port.

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