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Noise reduction device and outdoor unit

A technology of noise reduction and assembly holes, which is applied in the direction of refrigerators, instruments, heating methods, etc., can solve the problem of large fan noise and achieve the effect of reducing noise

Inactive Publication Date: 2020-10-30
QINGDAO HAIER SMART TECH R & D CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problem of high fan noise in the prior art, the present invention proposes a noise reduction device, which can absorb the noise and effectively reduce the noise transmitted outwards

Method used

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  • Noise reduction device and outdoor unit
  • Noise reduction device and outdoor unit
  • Noise reduction device and outdoor unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment one, such as figure 1 Shown is a structural schematic diagram of an outdoor unit, wherein the outdoor unit may be an outdoor unit of an air conditioner, an outdoor unit of a heat pump air-conditioning device, an outdoor unit of a heat pump water heater, etc., which at least includes a casing 2, and the interior of the casing 2 A fan 3 and a heat exchanger (not shown in the figure due to the angle) are provided, and an assembly hole 21 is opened at a position opposite to the fan 3 on the casing 2. When the outdoor unit is working, the heat exchanger performs heat exchange and absorbs heat. The heat or cold in the surrounding air, in order to improve the heat exchange efficiency, the fan 3 is turned on to accelerate the air flow, the air inside and outside the shell 2 circulates through the assembly hole 21, and the fan 3 is mostly used figure 1 The axial flow fan shown in , is the main noise source of the outdoor unit. The noise of the fan seriously affects pe...

Embodiment 2

[0053] Embodiment two, Figure 8 Shown is a sectional view of a U-shaped sub-muffling cavity 12a, which has a first side L1, a second side L2, and a third side L3. The depth of the sub-muffling cavity 12a is L1+L2+L3. Pass inward along the cavity surrounded by the first side L1, and part of it is reflected by the second side L2 after reaching the second side L2, and the other part continues to pass inward along the cavity surrounded by the second side L2, and reaches the third The latter part of the side L3 is reflected by the third side L3, and the other part continues to pass along the cavity surrounded by the third side L3 until it reaches the cavity bottom 123 and is reflected back by the cavity bottom 123. The reflected noise sound wave and the incident noise Sound waves are superimposed, and the depth L1+ L2+ L3 of the sub-muffling cavity 12a is set to be an odd multiple of a quarter of the wavelength of the noise to be eliminated, that is, L1+ L2+ L3=(2n-1)λ / 4. The fre...

Embodiment 3

[0061] Embodiment three, Figure 9 Shown is a sectional view of an L-shaped sub-muffling cavity 12b, which has a fourth side L4 and a fifth side L5. The depth of the sub-muffling cavity 12b is L4+L5, and the noise entering from its silencing inlet first follows the fourth side L4 The enclosed cavity passes inward, and after reaching the fifth side L5, part of it is reflected by the fifth side L5, and the other part continues to pass inward along the cavity enclosed by the fifth side L5, until it reaches the bottom 123 of the cavity, and is reflected by the bottom of the cavity. 123 is reflected back, the reflected noise sound wave is superimposed on the incident noise sound wave, and the depth L4+L5=(2n-1)λ / 4 of the sub-muffling cavity 12b is set. The frequency f of the noise to be eliminated ranges from 300Hz to 2500Hz. Since the frequency f of the noise to be eliminated is inversely proportional to the wavelength, the smaller the frequency f with noise elimination, the great...

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Abstract

The invention discloses a noise reduction device and an outdoor unit. The noise reduction device comprises a body and a silencing cavity; the body is provided with a through air guide hole in the middle; the silencing cavity is located in the body, and a silencing inlet communicating with the silencing cavity is formed in the side wall of the air guide hole; and the depth of the silencing cavity is (2n-1) lambda / 4, wherein 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 bottom of the silencing cavity, the value range of lambda is (A, B), and A is larger than 0 and smaller than B. According to the noise reduction device, the silencing cavity is formed in the circumferential directionof the air guide hole, the silencing inlet of the silencing cavity is formed in the inner side wall of the air guide hole, the depth of the silencing cavity is odd times that of a quarter of the wavelength of the noise to be eliminated, noise transmitted outwards through the air guide hole can be adsorbed by the silencing cavity, thus sound is effectively prevented from being transmitted out of the air guide hole, and the noise can be reduced efficiently. In addition, the air guide hole play an air guide role, and an air guide ring does not need to be arranged.

Description

technical field [0001] The invention relates to a noise reduction device and an outdoor unit with the noise reduction device. Background technique [0002] For heat pump systems and air conditioning systems, outdoor heat exchangers need to be equipped with fans to speed up the circulation of air to improve heat transfer capacity. The main noise sources of outdoor units are compressor noise, fan noise and structural vibration noise, of which fan noise accounts for the whole machine noise. More than 50%, so reducing fan noise is an important direction for the improvement of heat pump water heaters or outdoor units of air conditioners. For the control of fan noise of outdoor units, most of the existing solutions focus on using large fans to achieve noise reduction by reducing the speed, or changing the number of blades and optimizing the shape of blades to reduce noise, but limited by space and wind pressure requirements, reducing Noise effect is very limited. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F1/40F25B30/06G10K11/16
CPCF24F1/40F25B30/06F25B2500/12G10K11/16
Inventor 赵海霞范强孙兴朋项红荧闫茂松
Owner QINGDAO HAIER SMART TECH R & D CO LTD
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