Air duct of range hood and range hood

Abstract

The utility model relates to the technical field of range hoods, in particular to an air duct of a range hood and the range hood, the air duct of the range hood comprises an air duct body, a guide plate is arranged in the air duct body, a through hole is formed in the guide plate, and the guide plate divides the interior of the air duct body into a silencing space and a ventilation channel; and the silencer is arranged in the silencing space. The silencer is arranged in the silencing space separated in the air duct body through the flow guide plate, a back cavity or sound absorption cotton does not need to be arranged on the flow guide plate, the phenomenon that the thickness of the flow guide plate is increased to affect the air volume is avoided, and the good noise reduction and silencing effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to an air duct of a range hood and a range hood. Background Art

[0002] At present, the most commonly used noise reduction solution for range hoods is perforated plate plus sound-absorbing cotton. The main sound absorption effect of perforated plate plus sound-absorbing cotton is achieved by the sound absorption effect of the sound-absorbing cotton. The main function of the perforated plate is to play a supporting role and has no sound absorption effect. In addition, the presence of sound-absorbing cotton increases the thickness of the sound-absorbing structure in the range hood, which has the disadvantage of easily affecting the air volume. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes an air duct of a range hood, in which a muffler is arranged in a muffler space separated by a guide plate in the air duct body, which does not require a back cavity or sound-absorbing cotton to be arranged on the guide plate, avoids increasing the thickness of the guide plate to affect the air volume, and can also play a good role in noise reduction and silencing.

[0004] The utility model also provides a range hood.

[0005] The air duct of the range hood according to the first embodiment of the utility model comprises:

[0006] An air duct body, wherein a guide plate is provided in the air duct body, the guide plate is provided with a through hole, and the guide plate divides the interior of the air duct body into a silencing space and a ventilation channel;

[0007] A muffler is arranged in the muffler space.

[0008] The air duct of the range hood provided by the utility model is suitable for the installation of the air duct on the range hood, a guide plate is arranged inside the air duct body, and a plurality of through holes are arranged on the guide plate to form a perforated plate, the guide plate can separate the inside of the air duct body into a ventilation channel and a sound-absorbing space, after the air flow enters the air duct body, it flows through the guide plate along the ventilation channel, the guide plate has a certain guiding and drainage effect on the air flow, and can cooperate with the air duct body to enclose a sound-absorbing space, and a silencer is arranged in the sound-absorbing space, thereby the layout of the guide plate with through holes in the air duct body will change the phase of the sound pressure on the side where the sound-absorbing space inside the air duct body is located, so that the phase of the air duct sound pressure on both sides of the guide plate is inconsistent, that is, the sound-absorbing ventilation channel of the guide plate and the sound-absorbing space form an acoustically asymmetric structure, forming an asymmetric air duct design, and then realizing the pressure difference on both sides of the guide plate, and utilizing the pressure difference to stimulate the air column inside the through hole to oscillate to achieve the sound absorption effect, thereby realizing the sound absorption effect of the guide plate without back cavity and sound-absorbing cotton.

[0009] Compared with the prior art, a perforated plate plus sound-absorbing cotton is required as a sound-absorbing structure, and the main sound-absorbing effect is achieved by the sound-absorbing effect of the sound-absorbing cotton. The perforated plate only plays a supporting role, and the back cavity or the sound-absorbing cotton at the perforated plate increases the thickness of the sound-absorbing structure, which has the disadvantage of easily affecting the air volume. The utility model arranges a muffler in the sound-absorbing space separated by the guide plate in the air duct body, and does not need to arrange a back cavity or sound-absorbing cotton on the guide plate, so as to avoid increasing the thickness of the guide plate to affect the air volume, and can also play a good role in noise reduction and silencing.

[0010] According to one embodiment of the utility model, the muffler comprises:

[0011] A cover plate, wherein the cover plate is provided with perforations;

[0012] The shell is provided with an opening, the cover plate is covered on the opening to enclose a cavity with the shell, and at least one partition is provided in the cavity to divide the cavity into a plurality of cavities.

[0013] According to an embodiment of the utility model, the perforated plate is provided with a tube portion on the side facing the cavity, and the tube portion is arranged in a one-to-one correspondence with the perforations.

[0014] According to an embodiment of the present invention, the perforated plate is arranged to be inclined away from the side of the cavity so as to face the guide plate.

[0015] According to an embodiment of the utility model, the shape of the shell matches the shape of the air duct body corresponding to the sound-absorbing space.

[0016] According to an embodiment of the present invention, the spacing between adjacent through holes is smaller than the spacing between adjacent through holes.

[0017] According to an embodiment of the utility model, the muffler includes a quarter-wavelength tube, and the tube opening of the quarter-wavelength tube is arranged toward the guide plate.

[0018] According to one embodiment of the utility model, the muffler includes a shell, a chamber is provided inside the shell, the shell is provided with an opening, the opening is facing the guide plate, and the width of the opening is smaller than the width of the chamber in the direction extending along the guide plate, and the direction in which the guide plate extends is the flow direction of the airflow on the guide plate.

[0019] According to an embodiment of the utility model, the guide plate is a curved plate body, and the curved plate body is a plate body that is first convex and then concave along the flow direction of the airflow in the air duct body.

[0020] The range hood according to the embodiment of the second aspect of the utility model comprises the air duct of the range hood as described above.

[0021] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0022] The air duct of the range hood of the utility model embodiment is suitable for the installation of the air duct on the range hood, a guide plate is arranged inside the air duct body, and a plurality of through holes are arranged on the guide plate to form a perforated plate, the guide plate can separate the inside of the air duct body into a ventilation channel and a sound-absorbing space, after the air flow enters the air duct body, it flows through the guide plate along the ventilation channel, the guide plate has a certain guiding and diverting effect on the air flow, and can cooperate with the air duct body to enclose a sound-absorbing space, and a silencer is arranged in the sound-absorbing space, thereby the layout of the guide plate with through holes in the air duct body will change the phase of the sound pressure on the side where the sound-absorbing space inside the air duct body is located, so that the phase of the air duct sound pressure on both sides of the guide plate is inconsistent, that is, the sound-absorbing ventilation channel of the guide plate and the sound-absorbing space form an acoustically asymmetric structure, forming an asymmetric air duct design, and then realizing the pressure difference on both sides of the guide plate, and utilizing the pressure difference to stimulate the air column inside the through hole to oscillate to achieve the sound absorption effect, thereby realizing the sound absorption effect of the guide plate without back cavity and sound-absorbing cotton.

[0023] Compared with the prior art, a perforated plate plus sound-absorbing cotton is required as a sound-absorbing structure, and the main sound-absorbing effect is achieved by the sound-absorbing effect of the sound-absorbing cotton. The perforated plate only plays a supporting role, and the back cavity or the sound-absorbing cotton at the perforated plate increases the thickness of the sound-absorbing structure, which has the disadvantage of easily affecting the air volume. The utility model arranges a muffler in the sound-absorbing space separated by the guide plate in the air duct body, and does not need to arrange a back cavity or sound-absorbing cotton on the guide plate, so as to avoid increasing the thickness of the guide plate to affect the air volume, and can also play a good role in noise reduction and silencing.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the air duct of the range hood provided by the embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of a guide plate of an air duct of a range hood provided by an embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a muffler of an air duct of a range hood provided by an embodiment of the utility model;

[0029] Figure 4 This is one of the cross-sectional views of the muffler of the air duct of the range hood provided by the embodiment of the utility model;

[0030] Figure 5 This is the second cross-sectional view of the muffler of the air duct of the range hood provided in the embodiment of the utility model.

[0031] Reference numerals:

[0032] 100, muffler; 110, cover plate; 111, perforation; 120, housing; 121, opening; 122, cavity; 123, cavity; 130, partition; 140, pipe;

[0033] 200, air duct body; 210, guide plate; 211, through hole; 220, anechoic space; 230, ventilation channel. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] In the prior art, a perforated plate combined with a back cavity can form a sound-absorbing structure. The role of the back cavity is to make the sound pressure on both sides of the perforated plate different. The sound pressure difference on both sides of the perforated plate will stimulate the air column inside the perforation to oscillate, converting the sound energy into heat energy, thereby reducing noise. However, if the perforated plate itself is not combined with a back cavity, its sound absorption capacity is very weak, and the sound absorption coefficient is basically 0, which can be ignored. A perforated plate without a back cavity cannot achieve inconsistent sound pressure on both sides, so it cannot achieve the sound absorption effect.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the air duct of the range hood provided by the embodiment of the utility model includes an air duct body 200 and a muffler 100. A guide plate 210 is provided in the air duct body 200. The guide plate 210 is provided with a through hole 211. The guide plate 210 divides the interior of the air duct body 200 into a muffler space 220 and a ventilation channel 230. The muffler 100 is arranged in the muffler space 220.

[0041] The air duct of the range hood of the utility model embodiment is suitable for installation on the air duct of the range hood. A guide plate 210 is arranged inside the air duct body 200. A plurality of through holes 211 are arranged on the guide plate 210 to form a perforated plate 111. The guide plate 210 can separate the inside of the air duct body 200 into a ventilation channel 230 and a muffler space 220. After the airflow enters the air duct body 200, it flows through the guide plate 210 along the ventilation channel 230. The guide plate 210 has a certain guiding and drainage effect on the airflow, and can cooperate with the air duct body 200 to enclose the muffler space 220, and a muffler is arranged in the muffler space 220. 100, thus, the layout of the guide plate 210 with the through hole 211 in the air duct body 200 will change the phase of the sound pressure on the side where the internal sound absorption space 220 of the air duct body 200 is located, so that the air duct sound pressure phases on both sides of the guide plate 210 are inconsistent, that is, the sound absorption ventilation channel 230 of the guide plate 210 and the sound absorption space 220 form an acoustic asymmetric structure, forming an asymmetric air duct design, and then realizing the pressure difference on both sides of the guide plate 210, and utilizing the pressure difference to stimulate the air column inside the through hole 211 to oscillate to achieve the sound absorption effect, thereby realizing the sound absorption effect of the guide plate 210 without a back cavity and sound-absorbing cotton.

[0042] Compared with the prior art, the perforated 111 plate plus sound-absorbing cotton is required as a sound-absorbing structure, and the main sound-absorbing effect is achieved by the sound-absorbing effect of the sound-absorbing cotton. The perforated 111 plate only plays a supporting role, and the back cavity or the sound-absorbing cotton at the perforated 111 plate increases the thickness of the sound-absorbing structure, which has the disadvantage of easily affecting the air volume. The utility model arranges the muffler 100 in the sound-absorbing space 220 separated by the guide plate 210 in the air duct body 200, and does not need to arrange a back cavity or sound-absorbing cotton on the guide plate 210, so as to avoid increasing the thickness of the guide plate 210 to affect the air volume, and can also play a good role in noise reduction and silencing.

[0043] In this embodiment, the size of the through hole 211 on the guide plate 210 has a relatively large impact on the acoustic performance, so the optimal range is to control the diameter of the through hole 211 within 1 mm.

[0044] According to one embodiment of the utility model, the muffler 100 includes an outer shell 120 and a cover plate 110, the cover plate 110 is provided with a perforation 111; the outer shell 120 is provided with an opening 121, the cover plate 110 is covered on the opening 121 to enclose a cavity 122 with the outer shell 120, and at least one partition plate 130 is provided in the cavity 122 to divide the cavity 122 into a plurality of cavities 123. In this embodiment, the muffler 100 can be a Helmholtz resonator, which is mainly composed of a shell 120, a cover plate 110 and a partition plate 130. The shell 120 has an opening 121, and the cover plate 110 covers the outside of the opening 121. The shell 120 and the cover plate 110 jointly enclose a cavity 122. A plurality of partition plates 130 are arranged in the cavity 122 to divide the cavity 122 into a plurality of cavities 123 of the same size. The cover plate 110 is provided with a plurality of perforations 111, and each cavity 123 has a portion of the perforations 111 connected thereto. After the sound wave passes through the perforations 111, resonance is generated in the cavity 123, thereby weakening the sound wave and also playing a role in sound absorption. By arranging a Helmholtz resonator in the anechoic space 220, the sound pressure phase in the anechoic space 220 can be changed, thereby achieving a pressure difference between the anechoic space 220 and the ventilation channel 230, and then cooperating with the guide plate 210 to achieve a anechoic effect.

[0045] According to an embodiment of the utility model, the cover plate 110 is provided with a pipe portion 140 on the side facing the cavity 122, and the pipe portion 140 is arranged one-to-one with the perforation 111. In this embodiment, the cover plate 110 is provided with a plurality of pipe portions 140 on the side constituting the cavity 122, and the pipe portions 140 are arranged corresponding to the perforation 111, and the inner diameter of the pipe portion 140 is consistent with the aperture of the perforation 111, which is equivalent to the cover plate 110 extending a certain length into the cavity 122 at the position of the perforation 111 to form the pipe portion 140. The addition of the pipe portion 140 can enable the muffler 100 to absorb sound waves of a specific frequency, and by adjusting the length of the pipe portion 140, or by correspondingly arranging pipe portions 140 of different lengths at different perforations 111, it is possible to achieve the absorption of sound waves of multiple frequencies by one muffler 100.

[0046] According to an embodiment of the utility model, the side of the cover plate 110 away from the cavity 122 is tilted to face the guide plate 210. In this embodiment, the guide plate 210 is in a tilted state inside the air duct body 200, so the cover plate 110 of the muffler 100 is also in a tilted state on the side close to the guide plate 210, and the tilt angle is close to the tilt angle of the guide plate 210, or is consistent with the tilt angle of the guide plate 210. So that the sound waves passing through the through hole 211 of the guide plate 210 are more directly transmitted to the muffler 100 where the cover plate 110 is located, and the effect of the muffler 100 establishing the pressure difference on both sides of the guide plate 210 is improved.

[0047] According to an embodiment of the utility model, the shape of the shell 120 matches the shape of the air duct body 200 corresponding to the silencing space 220. In this embodiment, the shell 120 of the muffler 100 is closer to the air duct body 200 than the cover plate 110. In order to make full use of the space in the air duct body 200, the shape of the shell 120 is set to match the shape of the air duct body 200 at the silencing space 220 where it is located, and fits the shape of the silencing space 220. There is no need to increase space, and the structure of the guide plate 210 itself is not affected, and the air duct structure is more integrated.

[0048] In this embodiment, the air duct body 200 is a four-panel right-angle connection structure in the sound-absorbing space 220, and the corresponding outer shell 120 is also a corresponding four-plane shell plate vertical connection structure, and the plane shell plate is close to the panel, and the cover plate 110 is tilted, so that the silencer 100 has a triangular prism shape.

[0049] According to an embodiment of the present invention, the spacing between adjacent through holes 211 is smaller than the spacing between adjacent perforations 111. In this embodiment, the area of ​​the guide plate 210 is larger than the area of ​​the cover plate 110, and the density of the through holes 211 on the guide plate 210 is much greater than the density of the perforations 111 on the cover plate 110. Moreover, the aperture of the through holes 211 on the guide plate 210 is also smaller than the aperture of the perforations 111 on the cover plate 110.

[0050] According to an embodiment of the utility model, the muffler 100 includes a quarter-wave tube, and the pipe mouth of the quarter-wave tube is arranged toward the guide plate 210. In this embodiment, a plurality of quarter-wave tubes are arranged in the silencing space 220, and the axial extension direction of the quarter-wave tube is consistent with the axial direction of the through hole 211 on the guide plate 210, and each quarter-wave tube is arranged parallel to each other. One end of the quarter-wave tube is open and the other end is closed, and the pipe mouth is an end close to the guide plate 210. By arranging a quarter-wave tube in the silencing space 220, the sound pressure phase in the silencing space 220 can be changed, thereby achieving a pressure difference between the silencing space 220 and the ventilation channel 230, and then cooperating with the guide plate 210 to achieve a silencing effect.

[0051] According to one embodiment of the utility model, the muffler 100 includes a shell, a chamber is provided inside the shell, and an opening is provided in the shell, the opening faces the guide plate 210, and the width of the opening is smaller than the width of the chamber in the direction extending along the guide plate 210, and the direction in which the guide plate 210 extends is the flow direction of the airflow on the guide plate 210.

[0052] In this embodiment, the muffler 100 is configured as an expansion chamber, which is composed of a chamber inside the shell and an opening connected to the chamber. The opening is arranged relative to the guide plate 210. The space inside the chamber is much larger than the opening area. The sound wave enters the chamber from the opening, and the structural cross-section passing through it suddenly becomes larger, causing reflection and refraction of the sound wave, thereby causing sound consumption and achieving a silencing effect. By setting an expansion chamber in the silencing space 220, the sound pressure phase in the silencing space 220 can be changed, thereby achieving a pressure difference between the silencing space 220 and the ventilation channel 230, and then cooperating with the guide plate 210 to achieve a silencing effect.

[0053] In this embodiment, the shell surface where the opening is located is also an inclined surface close to the guide plate 210 or the same as the guide plate 210 .

[0054] According to an embodiment of the utility model, the guide plate 210 is a curved plate body, and the curved plate body is a plate body that first convexes upward and then concave along the flow direction of the airflow in the air duct body 200. In this embodiment, the guide plate 210 is a curved plate body, which has a structure that first convexes upward and then concave along the flow direction of the airflow, that is, a wavy curved plate body, which can make the airflow in the ventilation channel 230 naturally flow toward the guide plate 210 and guide it to a specified direction along the bending trend of the guide plate 210.

[0055] The range hood provided by the present invention is described below. The range hood described below and the check valve described above can be referenced to each other.

[0056] The range hood provided in the embodiment of the utility model comprises the air duct of the range hood as above.

[0057] In the range hood of the embodiment of the utility model, the silencer space 220 is constructed in the middle position of the air duct body 200, close to the inlet of the range hood. In other embodiments, the silencer space 220 may also be constructed in the upper position of the air duct body 200, close to the outlet of the range hood or other positions.

[0058] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. An air duct of a range hood, characterized in that: include: An air duct body, wherein a guide plate is provided in the air duct body, the guide plate is provided with a through hole, and the guide plate divides the interior of the air duct body into a sound-absorbing space and a ventilation channel; A muffler is arranged in the muffler space.

2. The air duct of the range hood according to claim 1, characterized in that: The muffler comprises: A cover plate, wherein the cover plate is provided with perforations; The shell is provided with an opening, the cover plate is covered on the opening to enclose a cavity with the shell, and at least one partition is provided in the cavity to divide the cavity into a plurality of cavities.

3. The air duct of the range hood according to claim 2, characterized in that: The cover plate is provided with a tube portion on the side facing the cavity, and the tube portion is arranged in one-to-one correspondence with the through holes.

4. The air duct of the range hood according to claim 2, characterized in that: The cover plate is arranged to be inclined away from the side of the cavity so as to face the guide plate.

5. The air duct of the range hood according to claim 2, characterized in that: The shape of the shell matches the shape of the air duct body corresponding to the sound-absorbing space.

6. The air duct of the range hood according to claim 2, characterized in that: The distance between adjacent through holes is smaller than the distance between adjacent through holes.

7. The air duct of the range hood according to claim 1, characterized in that: The muffler comprises a quarter-wavelength tube, and a tube opening of the quarter-wavelength tube is arranged toward the guide plate.

8. The air duct of the range hood according to claim 1, characterized in that: The muffler includes a shell, a chamber is provided inside the shell, the shell is provided with an opening, the opening faces the guide plate, and the width of the opening is smaller than the width of the chamber in the direction extending along the guide plate. The direction in which the guide plate extends is the flow direction of the airflow on the guide plate.

9. The air duct of the range hood according to any one of claims 1 to 8, characterized in that: The guide plate is a curved plate body, and the curved plate body is a plate body that is convex first and then concave along the flow direction of the airflow in the air duct body.

10. A range hood, characterized in that: Comprising the air duct of the range hood as described in any one of claims 1 to 9.

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