Smoke exhaust pipeline and range hood

Abstract

The embodiment of the utility model provides a smoke exhaust pipeline and a range hood, and relates to the technical field of kitchen appliances. The smoke exhaust pipeline comprises a smoke exhaust straight pipe and a bypass bent pipe, the inlet end and the outlet end of the bypass bent pipe communicate with the smoke exhaust straight pipe, and the inlet end and the outlet end are arranged in the extending direction of the smoke exhaust straight pipe in a spaced mode. When sound waves are transmitted in the smoke exhaust straight pipe, one part of the sound waves enter the bypass elbow through the inlet end and form a path difference with the other part of the sound waves in the smoke exhaust straight pipe, so that after the two parts of the sound waves meet at the outlet end, the sound waves in the specific frequency band form a phase difference, and therefore the two parts of the sound waves counteract with each other, and energy is reduced; the low and medium frequency noise is effectively reduced, and the noise reduction effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, and in particular to a smoke exhaust duct and a range hood. Background Art

[0002] As users demand more oil smoke absorption from range hoods, the exhaust volume of range hoods is also increasing, making the exhaust noise more prominent. In actual use, the noise of the exhaust duct accounts for a large proportion of the entire exhaust system.

[0003] Currently, the noise reduction method used in smoke exhaust ducts is usually based on covering with resistive sound-absorbing materials. However, the sound-absorbing effect of such materials on medium and low frequencies is relatively poor. Utility Model Content

[0004] The purpose of the utility model is to provide a smoke exhaust duct and a range hood, which can improve the noise reduction effect of medium and low frequencies.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a smoke exhaust duct, comprising:

[0007] straight exhaust pipes; and

[0008] The bypass elbow, the inlet end and the outlet end of the bypass elbow are both connected to the smoke exhaust straight pipe, and the inlet end and the outlet end are spaced apart along the extension direction of the smoke exhaust straight pipe.

[0009] In an optional embodiment, there are multiple bypass elbows, and the multiple bypass elbows are arranged at intervals around the circumference of the smoke exhaust straight pipe.

[0010] In an optional embodiment, at least two bypass elbows have different lengths.

[0011] In an optional embodiment, there are multiple straight smoke exhaust pipes, the multiple straight smoke exhaust pipes are connected in sequence, and each straight smoke exhaust pipe is provided with a bypass elbow.

[0012] In an optional embodiment, both ends of the smoke exhaust straight pipe are provided with an internal thread and an external thread respectively.

[0013] In an optional embodiment, the smoke exhaust duct further includes a sound-permeable membrane, and both the inlet end and the outlet end are covered with the sound-permeable membrane.

[0014] In an optional embodiment, the bypass elbow is in the shape of an arc.

[0015] In an optional embodiment, the smoke exhaust pipe further includes a switching port, which is provided at one end of the straight smoke exhaust pipe.

[0016] In an optional embodiment, the smoke exhaust duct further includes a transfer pipe, which is connected to the smoke exhaust straight pipe.

[0017] In a second aspect, the utility model provides a range hood comprising a range hood body and a smoke exhaust pipe according to any one of the aforementioned embodiments, wherein the range hood body is provided with a check valve seat, which is connected to the smoke exhaust straight pipe.

[0018] The beneficial effects of the embodiments of the present utility model include:

[0019] The smoke exhaust duct includes a straight smoke exhaust pipe and a bypass elbow. The inlet and outlet ends of the bypass elbow are both connected to the straight smoke exhaust pipe, and the inlet and outlet ends are spaced apart along the extension direction of the straight smoke exhaust pipe. During the transmission of sound waves in the straight smoke exhaust pipe, a portion of the sound waves enters the bypass elbow through the inlet end, passes through the internal channel of the bypass elbow, and continues to enter the straight smoke exhaust pipe from the outlet end. Because the straight-line transmission distance of the sound waves in the straight smoke exhaust pipe from the inlet end to the outlet end is shorter than the transmission distance of the sound waves in the bypass elbow, a path difference is formed between the two parts of the sound waves. In other words, after the two parts of the sound waves meet at the outlet end, the sound waves in a specific frequency band form a phase difference, so that the two parts of the sound waves cancel each other out, reducing energy, thereby effectively reducing mid- and low-frequency noise and improving the noise reduction effect.

[0020] The range hood comprises a smoke exhaust duct and has all the beneficial effects of the smoke exhaust duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a range hood provided by an embodiment of the present utility model;

[0023] Figure 2 An exploded view of a smoke exhaust duct provided in an embodiment of the present utility model;

[0024] Figure 3 A schematic diagram of a portion of the structure of a smoke exhaust duct provided in an embodiment of the present utility model;

[0025] Figure 4 A schematic structural diagram of a smoke exhaust duct provided in a second embodiment of the present invention;

[0026] Figure 5 This is a structural schematic diagram of a smoke exhaust duct provided in the third embodiment of the present utility model.

[0027] Icon: 1000-range hood; 100-exhaust pipe; 10-straight exhaust pipe; 11-internal thread; 12-external thread; 20-bypass elbow; 21-inlet end; 22-outlet end; 30-sound-transmitting membrane; 40-adapter; 50-adapter tube; 200-range hood body; 210-check valve seat. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", not that the structure must be completely horizontal, but can be slightly tilted.

[0033] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] As described in the background, smoke exhaust duct noise accounts for a significant portion of the overall smoke exhaust system during actual use. Currently, the primary noise reduction method used for smoke exhaust ducts is to coat them with resistive sound-absorbing materials. However, the inventors have discovered that, due to factors such as the flexibility and thickness of these materials, their sound absorption performance at mid- and low-frequency frequencies is poor.

[0035] Based on this, please refer to Figure 1-Figure 5 The present invention provides a smoke exhaust duct 100 and a range hood 1000 that can effectively address the aforementioned technical issues, namely, they can improve the noise reduction effect of medium and low frequencies. The smoke exhaust duct 100 and the range hood 1000 are described in detail below.

[0036] Please refer to Figure 1 , Figure 1 The structural diagram of the range hood 1000 provided in this embodiment is combined with Figure 1 The range hood 1000 includes a range hood body 200 and a smoke exhaust pipe 100. The smoke exhaust pipe 100 is connected to the range hood body 200 and is used to discharge the oil smoke sucked into the range hood body 200.

[0037] Specifically, please refer to Figure 2 , Figure 2 The exploded view of the smoke exhaust duct 100 provided in this embodiment is combined with Figure 2The smoke exhaust duct 100 includes a smoke exhaust straight pipe 10 and a bypass elbow 20. The inlet end 21 and the outlet end 22 of the bypass elbow 20 are both connected to the smoke exhaust straight pipe 10, and the inlet end 21 and the outlet end 22 are spaced apart along the extension direction of the smoke exhaust straight pipe 10. During the transmission of sound waves in the smoke exhaust straight pipe 10, a portion of the sound waves enters the bypass elbow 20 through the inlet end 21, passes through the internal channel of the bypass elbow 20, and then continues to enter the smoke exhaust straight pipe 10 from the outlet end 22. Because the straight-line transmission distance of the sound waves in the smoke exhaust straight pipe 10 from the inlet end 21 to the outlet end 22 is shorter than the transmission distance of the sound waves in the bypass elbow 20, a path difference is formed between the two parts of the sound waves. In other words, after the two parts of the sound waves meet at the outlet end 22, the sound waves in a specific frequency band form a phase difference, so that the two parts of the sound waves cancel each other out, reducing energy, thereby effectively reducing mid- and low-frequency noise and improving the noise reduction effect.

[0038] It should be noted that the extension direction of the exhaust straight pipe 10 mentioned above is Figure 1-Figure 5 In addition, it should be noted that due to the different pipe structures of the smoke exhaust straight pipe 10 and the bypass elbow 20, the length of the bypass elbow 20 is longer than the length of the pipe between the inlet end 21 and the outlet end 22 of the smoke exhaust straight pipe 10, resulting in a difference in the propagation distance of the sound waves in the two pipes, and thus a phase difference is formed after the two parts of the sound waves merge at the outlet end 22.

[0039] Combine Figure 1 and Figure 2 Specifically, a check valve seat 210 is provided on the range hood body 200 , and the check valve seat 210 is connected to the smoke exhaust straight pipe 10 .

[0040] Furthermore, to facilitate the installation of the straight smoke exhaust pipe 10 and the check valve seat 210, in this embodiment, the smoke exhaust pipe 100 further includes a transition pipe 50, which is connected to the straight smoke exhaust pipe 10, and the check valve seat 210 is connected to the transition pipe 50. In other words, the check valve seat 210, the transition pipe 50, and the straight smoke exhaust pipe 10 are sequentially connected, thereby facilitating the installation of the smoke exhaust pipe 100 and the range hood body 200 and also facilitating the exhaust of oil smoke.

[0041] At the same time, to facilitate the connection and installation of the smoke exhaust straight pipe 10 with other external exhaust pipes, in this embodiment, the smoke exhaust pipe 100 also includes an adapter 40. The adapter 40 is provided at one end of the smoke exhaust straight pipe 10. Specifically, the adapter 40 is provided at the end of the smoke exhaust straight pipe 10 away from the adapter tube 50. Through the provision of the adapter 40, other external exhaust pipes, such as aluminum foil corrugated pipes, can be connected to the smoke exhaust straight pipe 10 through the adapter 40, making installation convenient and quick.

[0042] Please continue to combine Figure 1 and Figure 2In order to increase the sound absorption of the smoke exhaust pipe 100 and further improve the noise reduction effect, in this embodiment, the number of the bypass elbows 20 is multiple, and the multiple bypass elbows 20 are arranged at intervals around the circumference of the smoke exhaust straight pipe 10.

[0043] It should be noted that the circumferential direction of the smoke exhaust straight pipe 10 mentioned above is Figure 1-Figure 5 B direction shown in FIG.

[0044] like Figure 1 and Figure 2 As shown, multiple bypass bends 20 can be understood as being arranged in parallel on the smoke exhaust straight pipe 10. Based on the half-wavelength tube principle, the larger the channel area of ​​the bypass bend 20, the larger the sound absorption coefficient, that is, the sound absorption amount will increase. Therefore, this embodiment adopts a method of connecting multiple bypass bends 20 in parallel, which can increase the flow area of ​​sound waves in the bypass bend 20, thereby improving the sound absorption amount and noise reduction effect.

[0045] Furthermore, to effectively allocate the sound absorption frequency band and amount according to actual conditions, at least two of the multiple bypass bends 20 have different lengths. Alternatively, the lengths of the multiple bypass bends 20 may be different. For example, if there are three bypass bends 20, two of the bypass bends 20 may have different lengths, or all three bypass bends 20 may have different lengths.

[0046] It should be noted that during the operation of the range hood 1000, the exhaust smoke forms an airflow, which will enter the exhaust straight pipe 10 through the check valve seat 210. In order to prevent the airflow from entering the bypass elbow 20 and causing airflow turbulence, please refer to Figure 3 , Figure 3 This is a partial structural diagram of the smoke exhaust pipe 100 provided in this embodiment, combined with Figure 3 The smoke exhaust duct 100 further includes a sound-transmitting membrane 30 , and both the inlet end 21 and the outlet end 22 are covered with the sound-transmitting membrane 30 .

[0047] The sound-permeable membrane 30 can effectively prevent airflow from entering the bypass elbow 20, thereby avoiding airflow turbulence and further improving the noise reduction effect. At the same time, the sound-permeable membrane 30 can also prevent oil stains in the smoke from entering the bypass elbow 20, thereby preventing the oil stains from clogging the pipe.

[0048] Based on the principle of half-wavelength pipes, the sound absorption frequency range of the smoke exhaust duct 100 is related to its size. Simply put, the greater the difference between the length of the bypass elbow 20 and the length of the straight smoke exhaust duct 10, the lower the effective sound absorption frequency range. Therefore, the specific lengths of the two can be adjusted to suit the user's home environment.

[0049] Based on this, if the user's kitchen space is large, in other embodiments, multiple exhaust pipes 10 can be connected in series, so that the sound absorption frequency band can be increased and the low-frequency sound absorption effect can be correspondingly enhanced. Figure 4 , Figure 4 The schematic diagram of the structure of the smoke exhaust pipe 100 provided in the second embodiment, combined with Figure 4 There are multiple smoke exhaust straight pipes 10, and the multiple smoke exhaust straight pipes 10 are connected in sequence, and each smoke exhaust straight pipe 10 is provided with a bypass elbow 20.

[0050] It should be noted that in most cases, the peak frequency band of the range hood 1000 noise is not limited to one place, and the effective frequency band of a single exhaust straight pipe 10 and a bypass elbow 20 is limited. Therefore, when the installation environment is met, a plurality of exhaust straight pipes 10 are used in series, and each exhaust straight pipe 10 is provided with a plurality of bypass elbows 20 in parallel, so as to achieve a better noise reduction effect.

[0051] It should also be noted that, in the second embodiment, the lengths of the plurality of smoke exhaust straight pipes 10 may be the same or different; and the lengths of the plurality of bypass bends 20 provided on each smoke exhaust straight pipe 10 may also be the same or different; in addition, the difference between the length of the smoke exhaust straight pipe 10 and the length of the bypass bend 20 may also be adjusted according to actual conditions.

[0052] Please continue to combine Figure 3 In order to facilitate the connection and installation of the exhaust pipe 10 with other components and improve the sealing effect, the two ends of the exhaust pipe 10 are respectively provided with an internal thread 11 and an external thread 12. Figure 2 and Figure 3 , the exhaust straight pipe 10 can be threadedly connected to the transfer pipe 50 through the internal thread 11, and at the same time, the exhaust straight pipe 10 can be threadedly connected to the transfer port 40 through the external thread 12; of course, in the second embodiment, combined with Figure 3 and Figure 4 The two adjacent smoke exhaust straight pipes 10 can also be connected and fixed by the internal thread 11 and the external thread 12.

[0053] In order to further prevent air leakage and sound transmission, the two threaded connections, that is, the connections between the two ends of the smoke exhaust straight pipe 10 and the adapter pipe 50 and the adapter port 40 respectively, as well as the connections between two adjacent smoke exhaust straight pipes 10, can also be secondary sealed by other connecting parts such as tape.

[0054] Please combine Figures 1-4 In the first embodiment and the second embodiment, the bypass bend 20 is in the shape of an arc. Of course, in some other embodiments, the bypass bend 20 can also be in other shapes, for example, please refer to Figure 5 , Figure 5 The third embodiment provides a schematic structural diagram of the smoke exhaust pipe 100, combined with Figure 5 The bypass elbow 20 formed on the exhaust straight pipe 10 has a trapezoidal shape.

[0055] It should be noted that, in some other embodiments, the shape of the bypass elbow 20 may also be wavy, “V” or “W” shaped, etc.

[0056] To sum up, an embodiment of the present invention provides a smoke exhaust duct 100 and a range hood 1000, wherein the smoke exhaust duct 100 includes a smoke exhaust straight pipe 10 and a bypass elbow 20, wherein the inlet end 21 and the outlet end 22 of the bypass elbow 20 are both connected to the smoke exhaust straight pipe 10, and the inlet end 21 and the outlet end 22 are spaced apart along the extension direction of the smoke exhaust straight pipe 10. During the transmission of sound waves in the smoke exhaust straight pipe 10, a part of the sound waves enters the bypass elbow 20 through the inlet end 21, passes through the internal channel of the bypass elbow 20, and continues to enter the smoke exhaust straight pipe 10 from the outlet end 22; since the straight-line transmission distance of the sound waves in the smoke exhaust straight pipe 10 from the inlet end 21 to the outlet end 22 is shorter than the transmission distance of the sound waves in the bypass elbow 20, a distance difference is formed between the two parts of the sound waves, that is, after the two parts of the sound waves meet at the outlet end 22, the sound waves in a specific frequency band form a phase difference, so that the two parts of the sound waves cancel each other out and reduce energy, thereby effectively reducing the noise in the medium and low frequencies and improving the noise reduction effect.

[0057] The range hood 1000 includes the smoke exhaust duct 100 and has all the functions and beneficial effects of the smoke exhaust duct 100 .

[0058] The above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A smoke exhaust duct, characterized in that: include: Smoke exhaust straight pipe (10); as well as A bypass elbow (20), wherein the inlet end (21) and the outlet end (22) of the bypass elbow (20) are both connected to the smoke exhaust straight pipe (10), and the inlet end (21) and the outlet end (22) are spaced apart along the extension direction of the smoke exhaust straight pipe (10).

2. The smoke exhaust duct according to claim 1, characterized in that: There are multiple bypass bends (20), and the multiple bypass bends (20) are arranged at intervals around the circumference of the smoke exhaust straight pipe (10).

3. The smoke exhaust duct according to claim 2, characterized in that: At least two of the bypass elbows (20) have different lengths.

4. The smoke exhaust duct according to claim 1, characterized in that: There are multiple smoke exhaust straight pipes (10), the multiple smoke exhaust straight pipes (10) are connected in sequence, and each of the smoke exhaust straight pipes (10) is provided with the bypass elbow (20).

5. The smoke exhaust duct according to claim 1, characterized in that: Both ends of the smoke exhaust straight pipe (10) are respectively provided with an internal thread (11) and an external thread (12).

6. The smoke exhaust duct according to claim 1, characterized in that: The smoke exhaust duct (100) further comprises a sound-permeable membrane (30), and both the inlet end (21) and the outlet end (22) are covered with the sound-permeable membrane (30).

7. The smoke exhaust duct according to claim 1, characterized in that: The bypass elbow (20) is in the shape of an arc.

8. The smoke exhaust duct according to claim 1, characterized in that: The smoke exhaust pipe (100) further comprises a transfer port (40), and the transfer port (40) is arranged at one end of the smoke exhaust straight pipe (10).

9. The smoke exhaust duct according to claim 1, characterized in that: The smoke exhaust pipe (100) further comprises a transfer pipe (50), and the transfer pipe (50) is connected to the smoke exhaust straight pipe (10).

10. A range hood, characterized in that: The smoke exhaust pipe (100) comprises a smoke exhaust machine body (200) and the smoke exhaust pipe (100) according to any one of claims 1 to 9, wherein the smoke exhaust machine body (200) is provided with a check valve seat (210), and the check valve seat (210) is connected to the smoke exhaust straight pipe (10).

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