Silencing device and household appliance thereof

Abstract

The utility model discloses a silencer and a household electrical appliance thereof, and the silencer comprises an air outlet seat which is provided with an air outlet channel for air flow to pass through; the fairing is provided with a hollowed-out protrusion which extends downwards and is provided with an upward opening, the hollowed-out protrusion is provided with an air vent for airflow to pass through, and the air vent is composed of a plurality of air distribution holes arranged at intervals; the fairing is mounted at the top of the air outlet seat, the hollow bulge extends into the air outlet channel, and each air distribution hole is communicated with the air outlet channel; or the fairing is installed on the top of the air outlet base through a fixing base, the fixing base is provided with an inner channel for airflow to pass through, the hollowed-out protrusions extend into the inner channel, and each air distribution hole is communicated with the air outlet channel through the inner channel. The silencer is simple in structure and capable of rectifying and combing airflow, and therefore noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a silencing device and a household appliance thereof. Background Art

[0002] As consumers have higher and higher requirements for the smoke removal effect of range hoods, manufacturers have raised the design targets of air volume and static pressure. As the speed of the fan increases significantly, the noise problem caused by it becomes more and more prominent, affecting the user experience. Summary of the invention

[0003] The utility model aims to solve at least one of the problems existing in the existing related technologies to a certain extent, and for this purpose, the utility model provides a muffler with a simple structure, which can rectify and comb the airflow, thereby reducing noise. The utility model also provides a household appliance.

[0004] According to the above-mentioned silencing device, it is implemented by the following technical solution:

[0005] A silencer device comprises: an air outlet seat, having an air outlet passage for air flow to pass through; a fairing, having a hollow protrusion extending downward and opening upward, an air vent for air flow to pass through is formed on the hollow protrusion, and the air vent is composed of a plurality of air dividing holes arranged at intervals; the fairing is installed on the top of the air outlet seat, the hollow protrusion extends into the air outlet passage, and each of the air dividing holes is connected to the air outlet passage; or the fairing is installed on the top of the air outlet seat through a fixing seat, the fixing seat has an inner channel for air flow to pass through, the hollow protrusion extends into the inner channel, and each of the air dividing holes is connected to the air outlet passage through the inner channel.

[0006] In some embodiments, the diameter of the hollow protrusion gradually increases from bottom to top, and the shape of the hollow protrusion is any one of a curved surface, a conical surface, an inverted truncated cone, or an inverted prism.

[0007] In some embodiments, the diameter of the upward opening of the hollow protrusion is D 1 , the height of the hollow protrusion is H 1 , H 1 ∈(0, 0.6D 1 ].

[0008] In some embodiments, the orthographic projection of the vent on the air outlet seat is larger than 50% of the total outlet area of ​​the air outlet channel, or the orthographic projection of the vent on the fixing seat is larger than 50% of the total airflow outlet area of ​​the inner channel.

[0009] In some embodiments, an upwardly opening annular groove is provided at the upper end of the air outlet seat or the fixing seat, and an outwardly and downwardly bent annular flange is integrally formed at the upper end periphery of the fairing, and the annular flange is inserted into the annular groove.

[0010] In some embodiments, the caliber of the inner channel gradually decreases from bottom to top, and the inner channel has an airflow inlet and an airflow outlet arranged relatively, and the diameter ratio of the airflow outlet to the airflow inlet is γ, γ∈(0.6H 2 , H 2 ].

[0011] In some embodiments, a sound-absorbing section is formed on the outer side wall of the fixing seat, and a plurality of sound-absorbing holes arranged at intervals are provided on the sound-absorbing section, and the sound-absorbing holes are communicated with the inner channel.

[0012] In some embodiments, the muffler section is disposed at the middle of the outer side wall of the fixing seat in the height direction, and the height of the fixing seat is H. 2 , the height of the muffler section is H 21 , H 21 ∈[0.6,1).

[0013] In some embodiments, a smoke exhaust pipe or a shell is disposed outside the fixing seat, a noise reduction cavity is formed between the fixing seat and the smoke exhaust pipe or the shell, and the noise reduction cavity is connected to the inner channel through the muffler hole.

[0014] In some embodiments, an annular step is formed on the outer wall of the fixing seat and is located below the silencer section. The lower end of the outer shell is bent inward to form a lower flange, and the lower flange abuts or is connected to the top surface of the annular step. The upper end of the outer shell is bent inward to form an upper flange, and the radial inner end of the upper flange abuts or is connected to the top of the fixing seat or the fairing.

[0015] In some embodiments, the noise reduction cavity is filled with a sound-absorbing layer, the sound-absorbing layer is sound-absorbing cotton, or the sound-absorbing layer is composed of a plurality of porous ceramic particles stacked on each other, and gaps for airflow to pass through are formed between adjacent porous ceramic particles.

[0016] According to a household appliance provided above, it is implemented through the following technical solution: a household appliance, which is a range hood or a gas water heater, and has a silencing device as described above.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The silencer of the utility model directly mounts the fairing on the air outlet seat, or mounts the fairing on the air outlet seat through a fixing seat, and provides a hollow protrusion extending toward the air outlet seat on the fairing, and provides a plurality of air distribution holes arranged at intervals on the hollow protrusion, so that the airflow can be rectified and combed, and the airflow tends to be uniform after passing through the fairing, thereby achieving noise reduction;

[0019] 2. By designing the diameter of the inner channel of the fixing seat to gradually decrease from bottom to top, and proportionally designing the airflow inlet and airflow outlet of the inner channel, the turbulent state of the airflow flowing out of the outlet seat is improved, the boundary layer separation is reduced, and at the same time, it is effectively ensured that the inner channel does not generate large local resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the muffler in Embodiment 1 of the present utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the muffler device in Embodiment 1 of the present utility model;

[0022] Figure 3 It is an exploded view of the silencer device in Embodiment 1 of the present utility model;

[0023] Figure 4 is a cross-sectional view of the silencer in Embodiment 1 of the present utility model;

[0024] Figure 5 is a cross-sectional view of the fairing in Embodiment 1 of the utility model;

[0025] Figure 6 is a cross-sectional view of the fixing seat in Embodiment 1 of the present utility model;

[0026] Figure 7 It is a cross-sectional view of the silencer device in Example 3 of the utility model after the air outlet seat is hidden.

[0027] In the figure: 1-air outlet seat; 2-fairing, 21-hollow protrusion, 211-air outlet, 22-annular flange; 3-fixed seat, 31-inner channel, 311-air flow inlet, 312-air flow outlet, 32-annular groove, 33-silencing section, 331-silencing hole, 34-annular step; 4-outer shell, 41-lower flange, 411-folded edge, 42-upper flange; 5-noise reduction chamber; 6-sound-absorbing cotton. DETAILED DESCRIPTION

[0028] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0029] Example 1

[0030] This embodiment provides a silencing device, which is applied to household appliances. Figure 1-4 In this embodiment, the silencer includes an air outlet seat 1, a fairing 2 and a fixing seat 3. The air outlet seat 1 has an air outlet passage (not shown in the figure) for air flow to pass through. The fairing 2 is installed on the top of the air outlet seat 1 through the fixing seat 3. The fixing seat 3 has an inner channel 31 for air flow to pass through. The lower end of the inner channel 31 is connected to the air outlet passage of the air outlet seat 1. The fairing 2 has a hollow protrusion 21 extending downward and opening upward. The hollow protrusion 21 extends downward into the inner channel 31. A vent for air flow to pass through is opened on the hollow protrusion 21. The vent is composed of a plurality of air distribution holes 211 evenly spaced on the hollow protrusion 21, and each air distribution hole 211 is connected to the upper end of the inner channel 31.

[0031] It can be seen that the fairing is installed on the air outlet seat through a fixing seat, and a hollow protrusion extending toward the inside of the fixing seat is provided on the fairing, and a plurality of air distribution holes arranged at intervals are provided on the hollow protrusion, which can rectify and comb the airflow, effectively improve the airflow velocity distribution at the outlet, make the airflow velocity distribution flowing through the fairing 2 tend to be uniform, and block the transmission of sound waves while ensuring the air volume, thereby achieving the function of reducing noise.

[0032] Furthermore, the diameter of the hollow protrusion 21 gradually increases from bottom to top, and the shape of the hollow protrusion 21 is a curved surface. Of course, the shape of the hollow protrusion 21 can also be designed to be any one of a cone, an inverted cone or an inverted prism. In this way, it is ensured that the hollow protrusion 21 can guide the airflow and guide the airflow to flow rapidly upward along the surface of the hollow protrusion 21. Combined with the multiple air distribution holes 211 arranged at even intervals, the airflow passing through the fairing is more evenly distributed.

[0033] refer to Figure 5 Furthermore, the diameter of the upward opening of the hollow protrusion 21 is D 1 , the height of the hollow protrusion 21 is H 1 , H 1 ∈(0, 0.6D 1], thus, by designing the ratio between the outlet and the height of the hollow protrusion 21, the noise reduction effect of the fairing 2 on the airflow is effectively guaranteed. In addition, the air distribution hole 211 is honeycomb-shaped, and of course the air distribution hole 211 can also be designed as a circular hole, an elliptical hole, a polygonal hole or a special-shaped hole; the positive projection of the vent on the fixing seat 3 is greater than 50% of the total area of ​​the airflow outlet 312 of the inner channel 31, so as to ensure the unit ventilation area of ​​the fairing 2 and ensure that the air volume does not decay sharply.

[0034] refer to Figure 1-4 In this embodiment, the lower end of the fixing seat 3 is detachably connected to the air outlet seat 1 through a snap-fit ​​structure. Of course, the two can also be detachably connected through a threaded structure or a magnetic structure, so that the fixing seat 3 and the air outlet seat 1 can be detachably connected as a whole. An annular groove 32 that opens upward and is located on the periphery of the inner channel 31 is recessed at the upper end of the fixing seat 3, and an annular flange 22 that is bent outward and downward is integrally formed at the upper end periphery of the fairing 2. The annular flange 22 is inserted into the annular groove 32, so that the fairing 2 can be detachably installed on the fixing seat 3 through the cooperation of the annular flange 22 and the annular groove 32. Of course, the fairing 2 and the fixing seat 3 can also be connected by snaps, threads, magnets, riveting or other connection methods.

[0035] refer to Figure 3-6 Furthermore, the diameter of the inner channel 31 gradually decreases from bottom to top, and the inner channel 31 has an airflow inlet 311 and an airflow outlet 312 arranged opposite to each other, and the diameter D of the airflow outlet 312 is 21 The diameter D of the air inlet 311 22 The ratio is γ, γ∈(0.6, 1], thus improving the turbulent state of the airflow flowing out of the air outlet seat 1, reducing boundary layer separation, and effectively ensuring that the inner channel does not generate a large local resistance.

[0036] A muffler section 33 is formed on the outer wall of the fixing seat 3. The muffler section 33 is located between the airflow inlet 311 and the airflow outlet 312. A plurality of muffler holes 331 are arranged at intervals on the muffler section 33. The muffler holes 331 are connected to the inner channel 31 to muffle the airflow and further improve the noise reduction effect. In this embodiment, the muffler section 33 is arranged in the middle of the outer wall of the fixing seat 3 in the height direction. The height of the fixing seat 3 is H 2 , the height of the silencer section 33 is H 21 , H 21 ∈[0.6H 2 , H 2 ) to ensure that the silencer has a better silencer effect.

[0037] refer to Figure 1-4In this embodiment, the silencer device further comprises a shell 4, which is mounted outside the fixing seat 3 and connected to the fixing seat 3. A noise reduction chamber 5 is formed between the fixing seat 3 and the shell 4, and the noise reduction chamber 5 is connected to the inner channel 31 through the silencer hole 331, so that the noise can be prevented from expanding outward and the sound insulation effect can be achieved. Furthermore, an annular step 34 is formed at the lower end of the outer wall of the fixing seat 3 and is located below the silencer section 33. The lower end of the shell 4 is bent inward to form a lower flange 41, and the lower flange 41 is abutted or connected to the top surface of the annular step 34. In addition, a folded edge 411 extending upward is integrally formed at the free end of the lower flange 41, and the folded edge is abutted or connected to the outer wall of the fixing seat 3. The upper end of the shell 4 is bent inward to form an upper flange 42, and the radial inner end of the upper flange 42 is abutted or connected to the top of the fixing seat 3 or the fairing 2.

[0038] In other embodiments, a smoke exhaust pipe may be used to replace the outer shell 4. In this case, the smoke exhaust pipe is mounted outside the fixing seat 3 and connected to the fixing seat 3. A noise reduction chamber 5 is formed between the fixing seat 3 and the smoke exhaust pipe, and the air vent of the fairing 2 is connected to the smoke exhaust pipe. Of course, the outer shell 4 may be omitted, and a smoke exhaust pipe connected to the air vent of the fairing 2 may be mounted outside the outer shell 4, and a sound insulation chamber may be formed between the smoke exhaust pipe and the outer shell 4. In this way, the smoke exhaust pipe not only plays a role in exhausting smoke, but also can further enhance the sound insulation effect.

[0039] refer to Figure 1-4 In this embodiment, the silencing device further includes a sound-absorbing layer (not shown in the figure), and the noise reduction cavity 5 is filled with a sound-absorbing layer, which is a sound-absorbing cotton 6, so as to further improve the silencing and noise reduction effect, and achieve the purpose of reducing aerodynamic noise and improving user experience. Of course, the sound-absorbing layer can also be changed to be composed of a plurality of porous ceramic particles stacked on each other, and gaps for airflow to pass through are formed between adjacent porous ceramic particles.

[0040] This embodiment also provides a household appliance, which is a range hood or a gas water heater, and has a silencing device as described above.

[0041] Example 2

[0042] The difference between this embodiment and embodiment 1 is that the structure of the silencer is different. In this embodiment, the silencer is composed of an air outlet seat 1 and a fairing 2, wherein the air outlet seat 1 has an air outlet passage for air flow to pass through. The fairing 2 is directly mounted on the top of the air outlet seat 1, and the fairing 2 has a hollow protrusion 21 extending downward and opening upward, and the hollow protrusion 21 extends downward into the air outlet passage of the air outlet seat 1. A vent for air flow to pass through is provided on the hollow protrusion 21, and the vent is composed of a plurality of air distribution holes 211 arranged at intervals, and each air distribution hole 211 is connected to the air outlet passage of the air outlet seat 1. Furthermore, the positive projection of the vent on the air outlet seat 1 is greater than 50% of the total outlet area of ​​the air outlet passage to ensure that the air volume does not sharply attenuate after the air flow passes through the fairing 2.

[0043] Furthermore, an annular groove opening upward is concavely provided at the upper end of the air outlet seat 1, and an annular flange 22 bent outward and downward is integrally formed at the upper end periphery of the fairing 2, and the annular flange 22 is inserted into the annular groove from top to bottom, so that the fairing 2 can be directly installed on the air outlet seat 1 through the cooperation of the annular groove and the annular flange. Of course, the fairing 2 and the air outlet seat 1 can be connected by other connection methods such as threads and screw buckles.

[0044] It can be seen that by directly installing the fairing 2 on the top of the air outlet seat 1, compared with the silencer device of Example 1, the fixing seat, the outer shell and the sound-absorbing cotton are omitted, the structure is simpler, the cost is lower, and it has the effects of rectifying, combing and noise reduction.

[0045] Example 3

[0046] refer to Figure 7 The difference between this embodiment and the first embodiment is that the muffler section on the fixing seat 3 is omitted, so that the inner channel 31 cannot be connected with the space outside the outer wall of the fixing seat 3. At this time, the fixing seat 3 can play a sound insulation effect, preventing the airflow noise flowing through the inner channel 31 from expanding outside the outer wall of the fixing seat 3, and can improve the turbulent state of the airflow flowing out of the air outlet seat 1, reduce boundary layer separation, and ensure that the inner channel 31 does not generate a large local resistance. It can be seen that by omitting the muffler section on the fixing seat 3, the fixing seat 3 has a sound insulation effect.

[0047] It is particularly noted that the sound-absorbing device of this embodiment can also omit the shell and / or the sound-absorbing cotton. When only the shell is omitted, the sound-absorbing cotton is sheathed outside the outer wall of the fixing seat 3 and connected to the fixing seat; when only the sound-absorbing cotton is omitted, the shell is sheathed outside the outer wall of 3 and connected to the fixing seat, and a noise reduction cavity is formed between the fixing seat 3 and the shell; when both the shell and the sound-absorbing cotton are omitted, in order to further improve the sound insulation effect, the exhaust pipe can be sheathed outside the fixing seat 3 and the fairing 2, and connected to the air outlet seat or the fixing seat 3, at this time, a sound insulation cavity or a noise reduction cavity is formed between the fixing seat and the exhaust pipe.

[0048] The above are only some embodiments of the present invention. For those skilled in the art, multiple variations and improvements can be made without departing from the inventive concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A silencing device, characterized in that: include: An air outlet seat (1) having an air outlet channel for air flow to pass through; The fairing (2) has a hollow protrusion (21) extending downward and opening upward, and a vent for airflow to pass through is provided on the hollow protrusion (21), and the vent is composed of a plurality of air distribution holes (211) arranged at intervals; The fairing (2) is mounted on the top of the air outlet seat (1), the hollow protrusion (21) extends into the air outlet channel, and each of the air distribution holes (211) is connected to the air outlet channel; or The fairing (2) is mounted on the top of the air outlet seat (1) via a fixing seat (3); the fixing seat (3) has an inner channel (31) for air flow to pass through; the hollow protrusion (21) extends into the inner channel (31); and each of the air distribution holes (211) is connected to the air outlet channel via the inner channel (31).

2. A silencing device according to claim 1, characterized in that: The diameter of the hollow protrusion (21) gradually increases from bottom to top, and the shape of the hollow protrusion (21) is any one of a curved surface, a conical surface, an inverted truncated cone or an inverted prism.

3. A silencing device according to claim 1, characterized in that: The diameter of the upward opening of the hollow protrusion (21) is D1, and the height of the hollow protrusion (21) is H1, H1∈(0, 0.6D1].

4. A silencing device according to claim 1, characterized in that: The orthographic projection of the vent on the air outlet seat (1) is greater than 50% of the total outlet area of ​​the air outlet channel, or the orthographic projection of the vent on the fixing seat (3) is greater than 50% of the total area of ​​the air flow outlet (312) of the inner channel (31).

5. A silencing device according to any one of claims 1 to 4, characterized in that: An upwardly opening annular groove (32) is provided at the upper end of the air outlet seat (1) or the fixing seat (3), and an outwardly and downwardly bent annular flange (22) is integrally formed on the upper end periphery of the fairing (2), and the annular flange (22) is inserted into the annular groove (32).

6. A silencing device according to claim 1, characterized in that: The caliber of the inner channel (31) gradually decreases from bottom to top, and the inner channel (31) has an airflow inlet (311) and an airflow outlet (312) arranged opposite to each other, and the diameter ratio of the airflow outlet (312) to the airflow inlet (311) is γ, γ∈(0.6, 1].

7. A silencing device according to claim 1 or 6, characterized in that: A sound-absorbing section (33) is formed on the outer side wall of the fixing seat (3), and a plurality of sound-absorbing holes (331) arranged at intervals are provided on the sound-absorbing section (33), and the sound-absorbing holes (331) are communicated with the inner channel (31).

8. A silencing device according to claim 7, characterized in that: The muffler section (33) is arranged at the middle of the outer side wall of the fixing seat (3) in the height direction. The height of the fixing seat (3) is H2, and the height of the muffler section (33) is H 21 , H 21 ∈[0.6H2,H2).

9. A silencing device according to claim 7, characterized in that: A smoke exhaust pipe or a shell (4) is disposed on the outer shell of the fixing seat (3), a noise reduction chamber (5) is formed between the fixing seat (3) and the smoke exhaust pipe or the shell (4), and the noise reduction chamber (5) is connected to the inner channel (31) through the muffler hole (331).

10. A silencing device according to claim 9, characterized in that: An annular step (34) is formed on the outer wall of the fixing seat (3) and is located below the muffler section (33); the lower end of the outer shell (4) is bent inwardly to form a lower flange (41); the lower flange (41) is in contact with or connected to the top surface of the annular step (34); the upper end of the outer shell (4) is bent inwardly to form an upper flange (42); the radial inner end of the upper flange (42) is in contact with or connected to the top of the fixing seat (3) or the fairing (2).

11. A silencing device according to claim 9, characterized in that: The noise reduction cavity (5) is filled with a sound absorbing layer, which is sound absorbing cotton (6), or the sound absorbing layer is composed of a plurality of porous ceramic particles stacked on each other, and gaps for airflow to pass through are formed between adjacent porous ceramic particles.

12. A household appliance, the household appliance being a range hood or a gas water heater, characterized in that: A silencer device as claimed in any one of claims 1 to 11.

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