阅读说明：本技术 一种降噪装置及室外机 (Noise reduction device and outdoor unit ) 是由 赵海霞 范强 孙兴朋 项红荧 闫茂松 于 2019-04-30 设计创作，主要内容包括：本发明公开了一种降噪装置及室外机,降噪装置包括：本体,其中部开设有贯通的导风孔；消音腔,其位于所述本体内,所述导风孔的侧壁上开设有与所述消音腔连通的消音进口,所述消音腔的深度为(2n-1)λ/4,其中,λ为待消除噪音的波长,n为正整数,所述消音腔的深度为自所述消音进口到所述消音腔的腔底的长度,λ的取值范围为(A,B),O＜A＜B。本发明的降噪装置,导风孔的周方向形成消音腔,所述消音腔的进音口开设在导风孔的内侧壁上,消音腔的深度为四分之一待消除噪声波长的奇数倍,通过导风孔向外传递的噪声可被消音腔进行吸收,从而有效防止声音导风孔中传出,有效降低噪声。另外,该导风孔起到导风的作用,无需设置导风圈。(The invention discloses a noise reduction device and an outdoor unit, wherein the noise reduction device comprises: the middle part of the body is provided with a through air guide hole; the silencing cavity is positioned in the body, a silencing inlet communicated with the silencing cavity is formed in the side wall of the air guide hole, the depth of the silencing cavity is (2 n-1) lambda/4, lambda is the wavelength of noise to be eliminated, n is a positive integer, the depth of the silencing cavity is the length from the silencing inlet to the cavity bottom of the silencing cavity, the value range of lambda is (A, B), and O is less than A and less than B. According to the noise reduction device, the sound attenuation cavity is formed in the circumferential direction of the air guide hole, the sound inlet of the sound attenuation cavity is formed in the inner side wall of the air guide hole, the depth of the sound attenuation cavity is one-fourth odd times of the wavelength of noise to be eliminated, and the noise transmitted outwards through the air guide hole can be absorbed by the sound attenuation cavity, so that the sound is effectively prevented from being transmitted out of the air guide hole, and the noise is effectively reduced. In addition, the air guide hole plays a role in air guide, and an air guide ring is not required to be arranged.)

1. A noise reducing device, comprising:

the middle part of the body is provided with a through air guide hole;

the silencing cavity is positioned in the body, a silencing inlet communicated with the silencing cavity is formed in the side wall of the air guide hole, the depth of the silencing cavity is (2 n-1) lambda/4, lambda is the wavelength of noise to be eliminated, n is a positive integer, the depth of the silencing cavity is the length from the silencing inlet to the cavity bottom of the silencing cavity, the value range of lambda is (A, B), and O is less than A and less than B.

2. The noise reduction device according to claim 1, wherein a plurality of partition plates parallel to the axial direction of the air guide hole are arranged in the silencing cavity to partition the silencing cavity into a plurality of sub-silencing cavities, and the sub-silencing cavities are in any combination of a straight cylinder shape, an L shape and a U shape.

3. The noise reduction device according to claim 2, wherein the sub-muffling chamber has a first side L1, a second side L2 and a third side L3 when it is U-shaped, and a depth L1+ L2+ L3= (2 n-1) λ/4.

4. The noise reduction device of claim 3, wherein L1, L2 satisfy:

L1 =（2n₁-1）λ₁/4, and (2 n)₁-1）λ₁＜（2n-1）λ；

And/or the presence of a gas in the gas,

L1+L2=（2n₂-1）λ₂/4, and (2 n)₂-1）λ₂＜（2n-1）λ；

Wherein n is₁、n₂The value ranges of (A) are all positive integers; lambda [ alpha ]₁、λ₂The value range of (A) is (B).

5. The noise reduction device according to claim 2, wherein the sub-muffling chamber has a fourth side L4 and a fifth side L5 when it is L-shaped, and a depth L4+ L5= (2 n-1) λ/4.

6. The noise reduction device of claim 5, wherein L4 and L5 satisfy the following equation:

L4 =（2n₃-1）λ₃/4, and (2 n)₃-1）λ₃＜（2n-1）λ；

Wherein n is₃The value ranges of (A) are all positive integers; lambda [ alpha ]₃The value range of (A) is (B).

7. The noise reducer according to any of claims 1-6, wherein a plurality of laminates perpendicular to the axial direction of the air guide holes are further disposed in the body, and the laminates separate the sound-deadening chamber into multiple independent layers.

8. The noise reduction device according to any one of claims 1 to 6, wherein the noise reduction cavities in the same layer are uniformly distributed along the circumferential direction of the air guide hole.

9. The noise reducer according to any of claims 1-6, wherein the air guiding hole is circular, the body is square, and the muffling cavities are respectively located at four corners of the body.

10. An outdoor unit comprising a casing and a fan disposed in the casing, the casing being provided with a fitting hole opposed to the fan, characterized by further comprising the noise reducing device according to any one of claims 1 to 9, the noise reducing device being fitted in the fitting hole.

Technical Field

The invention relates to a noise reduction device and an outdoor unit with the same.

Background

For a heat pump system and an air conditioning system, an outdoor heat exchanger needs to be provided with a fan to accelerate air circulation so as to improve heat exchange capacity, main noise sources of an outdoor unit are compressor noise, fan noise and structural vibration noise, wherein the fan noise accounts for more than 50% of the noise of the whole unit, and therefore, the reduction of the fan noise is an important direction for improvement of a heat pump water heater or an air conditioning outdoor unit. For the control of the noise of the outdoor unit fan, most of the existing solutions focus on using a large fan, and the noise reduction is realized by reducing the rotating speed, or changing the number of blades and optimizing the shape of the blades, but the existing solutions are limited by the requirements of space and wind pressure, and the noise reduction effect is very limited.

Disclosure of Invention

The invention provides a noise reduction device aiming at the technical problem of high noise of a fan in the prior art, which can absorb noise and effectively reduce the noise transmitted outwards.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

a noise reducing device comprising:

the middle part of the body is provided with a through air guide hole;

the silencing cavity is positioned in the body, a silencing inlet communicated with the silencing cavity is formed in the side wall of the air guide hole, the depth of the silencing cavity is (2 n-1) lambda/4, lambda is the wavelength of noise to be eliminated, n is a positive integer, the depth of the silencing cavity is the length from the silencing inlet to the cavity bottom of the silencing cavity, the value range of lambda is (A, B), and O is less than A and less than B.

Furthermore, a plurality of partition plates parallel to the axial direction of the air guide hole are arranged in the silencing cavity, the silencing cavity is partitioned into a plurality of sub-silencing cavities, and the sub-silencing cavities are in any combination of straight cylinder shapes, L shapes and U shapes.

Further, when the sub-sound-deadening chamber is U-shaped, it has a first side L1, a second side L2, and a third side L3, and its depth is L1+ L2+ L3= (2 n-1) λ/4.

Further, L1, L2, and L3 satisfy any combination of the following equations:

L1 =（2n₁-1）λ₁/4, and (2 n)₁-1）λ₁＜（2n-1）λ；

L2 =（2n₂-1）λ₂/4, and (2 n)₂-1）λ₂＜（2n-1）λ；

L3 =（2n₃-1）λ₃/4, and (2 n)₃-1）λ₃＜（2n-1）λ；

L1+L2=（2n₄-1）λ₄/4, and (2 n)₄-1）λ₄＜（2n-1）λ；

L2+L3=（2n₅-1）λ₅/4, and (2 n)₅-1）λ₅＜（2n-1）λ；

Wherein n is₁、n₂、n₃、n₄、n₅The value ranges of (A) are all positive integers; lambda [ alpha ]₁、λ₂、λ₃、λ₄、λ₅The value range of (A) is (B).

Further, when the sub-sound-deadening cavity is L-shaped, it has a fourth side L4 and a fifth side L5, and its depth L4+ L5= (2 n-1) λ/4.

Further, L4 and L5 satisfy any combination of the following equations:

L4 =（2n₆-1）λ₆/4, and (2 n)₆-1）λ₆＜（2n-1）λ；

L5 =（2n₇-1）λ₇/4, and (2 n)₇-1）λ₇＜（2n-1）λ；

L4+L5=（2n₈-1）λ₈/4, and (2 n)₈-1）λ₈＜（2n-1）λ；

Wherein n is₆、n₇、n₈The value ranges of (A) are all positive integers; lambda [ alpha ]₆、λ₇、λ₈The value range of (A) is (B).

Furthermore, a plurality of laminates which are vertical to the axial direction of the air guide hole are arranged in the body, and the laminates separate the silencing cavity into a plurality of independent layers.

Furthermore, the silencing cavities in the same layer are uniformly distributed along the circumferential direction of the air guide holes.

Furthermore, the air guide hole is circular, the body is square, and the silencing cavities are respectively positioned at four corners of the body.

The invention also provides an outdoor unit, which comprises a shell and a fan arranged in the shell, wherein the shell is provided with an assembling hole opposite to the fan, the outdoor unit also comprises the noise reduction device recorded in any one of the above, and the noise reduction device is assembled in the assembling hole.

Compared with the prior art, the invention has the advantages and positive effects that: according to the noise reduction device, the sound attenuation cavity is formed in the circumferential direction of the air guide hole, the sound inlet of the sound attenuation cavity is formed in the inner side wall of the air guide hole, the depth of the sound attenuation cavity is one-fourth odd times of the wavelength of noise to be eliminated, and the noise transmitted outwards through the air guide hole can be absorbed by the sound attenuation cavity, so that the sound is effectively prevented from being transmitted out of the air guide hole, and the noise is effectively reduced. In addition, the air guide hole plays a role in air guide, and an air guide ring is not required to be arranged.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an outdoor unit according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural diagram of an embodiment of a noise reduction apparatus according to the present invention;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a sectional view taken along line B of FIG. 4;

FIG. 6 is an enlarged view of section C of FIG. 5;

FIG. 7 is a schematic view of the noise reduction device of the present invention;

FIG. 8 is a schematic structural view of a U-shaped sub-muffling chamber of the noise reducer of the present invention;

FIG. 9 is a schematic structural view of an L-shaped sub-muffling chamber of the noise reducer of the present invention;

fig. 10 is a schematic structural view of a straight cylindrical sub-muffling chamber of the noise reducer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "connecting," and "connected" in the description of the present invention are used in a generic sense, and for example, they can be fixed, detachable, or integrally connected, mechanically or electrically, directly or indirectly connected through an intermediate medium, or connected through the inside of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.