Silencer for radial air supply, air duct assembly and refrigerator

Abstract

The invention relates to the technical field of refrigerator noise reduction, and provides a silencer for radial air supply, which comprises an annular shell, and an avoiding space is formed in the center of the shell; a plurality of silencing cavities are formed in the shell; and through holes which are opposite to each other are respectively formed in the inner ring surface and the outer ring surface of the shell corresponding to each silencing cavity. Therefore, sound waves can enter the silencing cavity from the through hole, and are subjected to multiple times of reflection attenuation silencing between the inner walls of the silencing cavity. And meanwhile, the through holes in the inner ring surface and the outer ring surface of the silencer are opposite to each other, so that airflow can smoothly pass through the silencer, and obstruction to the airflow is reduced. And on the premise that the radial air flow flux is not reduced, noise is reduced. The invention further provides an air duct assembly which is provided with the silencer, noise of a draught fan source can be eliminated, and meanwhile the overall size of an air duct plate is not increased. The invention further provides the refrigerator.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerator noise reduction, and in particular relates to a muffler for radial air supply, an air duct component and a refrigerator. Background Art

[0002] For refrigerators, in addition to performance parameters such as refrigeration and energy consumption, the noise of the whole machine is also a focus of users. As the main sound source, the fan will form sound wave flows of different densities around its blades. At the same time, affected by the shape of the air duct or the shape of the volute outside the air outlet, noises of different frequencies and sizes will be generated. Most existing mufflers are used in air ducts and cannot reduce noise close to the source of noise.

[0003] Chinese patent CN106593958A discloses an air duct, which is provided with a muffler cavity outside the volute. Although this structure can reduce the noise of airflow blowing into the volute, it does not muffle the noise at the location where the fan generates noise, and the muffler cavity needs to occupy a certain space, which increases the volume of the entire air duct structure, occupies additional space in the refrigerator, and reduces the effective storage volume.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention mainly provides a muffler for radial air supply to solve the technical problem of reducing noise close to the noise source.

[0006] In order to solve the above-mentioned problem, the present invention provides a silencer for radial air supply, comprising an annular shell, wherein a clearance space is formed at the center of the shell; a plurality of silencer cavities are arranged in the shell; and through holes arranged opposite to each other are respectively opened on the inner annular surface and the outer annular surface of the shell corresponding to each silencer cavity.

[0007] According to the muffler for radial air supply of the present invention, the multiple muffler chambers in the shell are arranged in sequence along the circumferential direction of the arc; a radial partition is provided between two adjacent muffler chambers; and the through holes of the inner annular surface and the outer annular surface are both located on the center line of the muffler chamber.

[0008] According to the silencer for radial air supply of the present invention, at least two sub-chambers are arranged in parallel along the circumferential direction of the arc in the silencer chamber; a chamber partition is arranged between two adjacent sub-chambers; through holes are opened on the chamber partition; and the through holes of the silencer chamber are all located on the same radial straight line.

[0009] According to the muffler for radial air supply of the present invention, the spacings between the sub-chambers in the muffler cavity are the same, or the spacings between the sub-chambers in the muffler cavity are different, and the spacings between the sub-chambers are in integer multiples.

[0010] According to the muffler for radial air supply of the present invention, a plurality of muffler holes are provided on the chamber partition; the area of ​​the muffler holes is smaller than the area of ​​the through hole.

[0011] According to the muffler for radial air supply of the present invention, a plurality of muffler hole groups are arranged at equal intervals on the chamber partition, and each muffler hole group includes a plurality of muffler holes arranged linearly and parallel to the axial direction of the shell.

[0012] According to the muffler for radial air supply of the present invention, the diameter of the muffler hole does not exceed 2 mm, and the diameter of the through hole does not exceed 5 mm.

[0013] According to the muffler for radial air supply of the present invention, the through holes extend to positions close to two end surfaces of the shell respectively; the through holes of the muffler cavity form radial airflow channels; and the airflow channels divide the muffler cavity into equal parts along the radial direction.

[0014] An air duct assembly comprises an air duct plate; a centrifugal fan is installed on the back side of the air duct plate, and an air suction port facing the air suction end of the centrifugal fan is also opened on the air duct plate; a muffler is installed on the back side of the air duct plate along the edge of the air suction port; specifically:

[0015] The centrifugal fan is arranged close to the end surface of the shell of the muffler; or the centrifugal fan is embedded in the clearance space of the shell of the muffler;

[0016] The back of the air duct plate is also provided with a volute located outside the centrifugal fan; a plurality of flow channels are arranged in the area surrounded by the volute, and an air supply port is arranged at the end of each flow channel.

[0017] A refrigerator comprises the air duct assembly.

[0018] In summary, in the silencer for radial air supply of the present invention, sound waves can enter the silencer cavity from the through hole, and the sound is attenuated by multiple reflections between the inner walls of the silencer cavity. At the same time, the through holes of the inner annular surface and the outer annular surface of the silencer face each other, which allows the airflow to pass smoothly and reduces obstruction to the airflow. The noise is reduced without reducing the radial airflow rate. The present invention also provides an air duct assembly having the silencer, which can eliminate the noise at the source of the fan without increasing the overall volume of the air duct plate. The present invention also provides a refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the air duct assembly of the present invention;

[0020] Figure 2 yes Figure 1 A schematic structural diagram of an embodiment of the invention;

[0021] Figure 3It is a schematic diagram of the external structure of an embodiment of the muffler of the present invention;

[0022] Figure 4 yes Figure 3 A schematic diagram of the internal structure of an embodiment of a middle muffler;

[0023] Figure 5 yes Figure 3 A schematic diagram of the internal structure of an embodiment of a middle muffler;

[0024] Figure 6 yes Figure 1 A schematic structural diagram of an embodiment of the invention;

[0025] Figure 7 yes Figure 6 Schematic diagram of the internal structure of the middle muffler;

[0026] In the figure: 1-centrifugal fan, 11-air inlet; 2-housing, 21-through hole, 22-silence chamber, 221-sub-chamber; 23-radial partition, 24-chamber partition, 25-silence hole; 3-volute, 31-volute tongue, 32-flow channel, 33-air outlet; 100-duct plate. DETAILED DESCRIPTION

[0027] See also Figure 3 The present invention provides a muffler for radial air supply, comprising an annular shell 2, wherein a clearance space is formed at the center of the shell 2; Figure 4 , a plurality of muffler cavities 22 are arranged in the shell 2; through holes 21 arranged opposite to each other are respectively opened on the inner annular surface and the outer annular surface of the shell 2 corresponding to each muffler cavity 22;

[0028] More preferably, the through holes 21 on the inner annular surface and the outer annular surface are both located on the center line of the muffler cavity 22 .

[0029] The sound waves can enter the muffler cavity 22 from the through hole 21 and form a vortex in the muffler cavity 22; the muffler is attenuated by multiple reflections between the inner walls of the muffler cavity 22, thereby achieving the purpose of muffler. At the same time, the through holes 21 on the inner and outer annular surfaces of the muffler face each other, allowing the airflow to pass smoothly and reducing the obstruction to the airflow. The noise is reduced from the source without reducing the airflow rate.

[0030] Combination Figure 1 and Figure 2 Preferably, the muffler of the present invention is adapted to air supply equipment with radial air supply function, such as centrifugal fan 1. The muffler can be arranged close to the air intake end of the centrifugal fan 1, and its inner annular surface can partially or completely cover the air outlet end of the centrifugal fan 1. The centrifugal fan 1 reduces noise while supplying air, thus achieving the purpose of reducing noise from the fan source.

[0031] As an embodiment, the multiple silencer chambers 22 in the shell 2 of the present invention are arranged in sequence along the circumferential direction of the arc; a radial partition plate 23 is provided between two adjacent silencer chambers 22; the silencer chambers 22 are not connected to each other and silence independently; to avoid the sound waves being connected in series between different silencer chambers 22, which would affect the noise reduction effect.

[0032] Those skilled in the art set parameters such as the diameter of the through hole 21 , the gap of the muffler cavity 22 , and the volume of the muffler cavity 22 to eliminate sound waves of a predetermined frequency.

[0033] Optionally, the circumferential arc lengths of the muffler cavities 22 of the present invention are the same, and the muffler cavities 22 can eliminate sound waves of the same frequency.

[0034] Optionally, when there is an obstruction around the muffler; different shapes of the obstruction or different distances between the obstruction and the outer annular surface of the shell 2 will result in different frequencies of the generated sound waves. For example, a volute 3 is arranged around the muffler, and the high-frequency sound waves generated near the volute tongue 31 are concentrated. Therefore, in order to eliminate sound waves of different frequencies, the circumferential arc lengths of the muffler cavities 22 in the shell 2 are different. That is, according to the frequency of the sound waves generated by the obstruction, the circumferential arc length of the muffler cavity 22 at the corresponding position is set, so that the muffler can eliminate sound waves of multiple frequencies.

[0035] See also Figure 4 As an embodiment, at least two sub-chambers 221 are arranged in parallel along the circumferential direction of the arc in the muffler chamber 22; a chamber partition 24 is arranged between two adjacent sub-chambers 221; a through hole 21 is opened on the chamber partition 24; each through hole 21 of the muffler chamber 22 is located on the same radial straight line; so that the airflow can pass smoothly.

[0036] Compared with the silencing chamber 22, the gap of the sub-chamber 221 is smaller, and the elimination effect of high-frequency sound waves is better. Those skilled in the art can adaptively set the number of sub-chambers 221 in the silencing chamber 22 according to the frequency of the sound waves to be eliminated.

[0037] Optionally, the distances between the sub-chambers 221 in the muffler cavity 22 are the same; the energy of the sound waves can be significantly reduced or eliminated after multiple stages of attenuation.

[0038] Optionally, the spacings between the sub-chambers 221 in the muffler chamber 22 are different, and the spacings between the sub-chambers 221 are in integer multiples; the muffler chamber 22 eliminates a family of sound waves with frequencies in integer multiples through the sub-chambers 221 .

[0039] See also Figure 5As an embodiment, the chamber partition 24 is provided with a plurality of silencer holes 25; the aperture of the silencer hole 25 is much smaller than the aperture of the through hole 21, and can cooperate with the through hole 21 to eliminate sound waves of different frequencies. Preferably, a plurality of silencer hole groups are arranged at equal intervals on the chamber partition 24, and each silencer hole group includes a plurality of silencer holes 25 arranged linearly parallel to the axial direction of the housing 2; the airflow is divided into multiple streams and flows through each silencer hole 25, reducing obstruction and eliminating noise at the same time.

[0040] Furthermore, the diameter of the muffler hole 25 does not exceed 2 mm, and the diameter of the through hole 21 does not exceed 5 mm.

[0041] See also Figure 6 and Figure 7 As an embodiment, the through holes 21 extend to positions close to the two end surfaces of the housing 2 respectively; the through holes 21 of the muffler cavity 22 form radial airflow channels, which have good ventilation function. The airflow channels divide the muffler cavity 22 equally in the radial direction.

[0042] The area of ​​the through hole 21 of this embodiment is significantly enlarged, mainly for airflow, and its size can be adaptively set according to the specific volume and ventilation volume of the muffler. The centrifugal fan 1 can be embedded in the clearance space, and the airflow at the air outlet is smoothly delivered through the airflow channel. When the airflow flows through the muffler cavity 22, the sound waves enter the muffler cavity 22 on both sides of the airflow channel, and are attenuated and eliminated.

[0043] Furthermore, the muffler chamber 22 has a plurality of sub-chambers 221, which enhances the degree of sound wave attenuation. The chamber partition 24 is provided with a plurality of muffler holes 25, which can eliminate noises of different frequencies and assist air flow.

[0044] See also Figure 1 and Figure 2 The present invention further provides an air duct assembly, comprising an air duct plate 100; a centrifugal fan 1 is installed on the back side of the air duct plate 100, and an air suction port 11 facing the air suction end of the centrifugal fan 1 is also opened on the air duct plate 100;

[0045] The muffler is installed on the back side of the air duct plate 100 along the edge of the air inlet 11; the centrifugal fan 1 is arranged close to the end face of the shell 2 of the muffler; or the centrifugal fan 1 is embedded in the clearance space of the shell 2.

[0046] The back of the air duct plate 100 is also provided with a volute 3 located outside the centrifugal fan 1; a plurality of flow channels 32 are provided in the area enclosed by the volute 3, and an air outlet 33 is provided at the end of each flow channel 32;

[0047] Those skilled in the art can select the structure of the muffler chamber 22 in the housing 2 according to the shape of the volute 3 and the distance between the volute 3 and the muffler housing 2, and eliminate noises of different frequencies accordingly. Noise is eliminated at the source of the centrifugal fan 1 without increasing the overall volume of the air duct plate 100.

[0048] The present invention also provides a refrigerator having the air duct assembly.

[0049] In summary, the present invention provides a muffler for radial air supply, in which sound waves can enter the muffler chamber from the through holes and be attenuated and silenced by multiple reflections between the inner walls of the muffler chamber. At the same time, the through holes of the inner annular surface and the outer annular surface of the muffler face each other, allowing the airflow to pass smoothly and reducing obstruction to the airflow. Noise is reduced without reducing the radial airflow rate. The present invention also provides an air duct assembly having the muffler, which can eliminate the noise at the source of the fan without increasing the overall volume of the air duct plate. The present invention also provides a refrigerator.

[0050] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A muffler for radial air supply, characterized in that: It comprises an annular shell, wherein a clearance space is formed at the center of the shell; a plurality of muffler cavities are arranged in the shell; and mutually opposite through holes are respectively opened on the inner annular surface and the outer annular surface of the shell corresponding to each muffler cavity.

2. The muffler for radial air supply according to claim 1, characterized in that: The multiple muffler cavities in the shell are arranged in sequence along the circumferential direction of the arc; a radial partition is arranged between two adjacent muffler cavities; and the through holes on the inner annular surface and the outer annular surface are both located on the center line of the muffler cavity.

3. The muffler for radial air supply according to claim 1, characterized in that: At least two sub-chambers are arranged in parallel along the circumferential direction of the arc in the muffler chamber; a chamber partition is arranged between two adjacent sub-chambers; through holes are opened on the chamber partition; and the through holes of the muffler chamber are all located on the same radial straight line.

4. The muffler for radial air supply according to claim 3, characterized in that: The spacings between the sub-chambers in the muffler chamber are the same, or the spacings between the sub-chambers in the muffler chamber are different, and the spacings between the sub-chambers are in integer multiples.

5. The muffler for radial air supply according to claim 3, characterized in that: The chamber partition is provided with a plurality of silencer holes; the area of ​​the silencer holes is smaller than the area of ​​the through holes.

6. The muffler for radial air supply according to claim 5, characterized in that: A plurality of muffler hole groups are arranged at equal intervals on the chamber partition, and each muffler hole group includes a plurality of muffler holes that are linearly arranged and parallel to the axial direction of the shell.

7. The muffler for radial air supply according to claim 5, characterized in that: The diameter of the muffler hole does not exceed 2 mm, and the diameter of the through hole does not exceed 5 mm.

8. The muffler for radial air supply according to any one of claims 1 to 6, characterized in that: The through holes extend to positions close to two end surfaces of the shell respectively; the through holes of the muffler cavity form radial airflow channels; and the airflow channels divide the muffler cavity equally in radial direction.

9. An air duct assembly, characterized in that: It comprises an air duct plate; a centrifugal fan is installed on the back side of the air duct plate, and an air suction port facing the air suction end of the centrifugal fan is also opened on the air duct plate; a muffler is installed on the back side of the air duct plate along the edge of the air suction port; specifically: The centrifugal fan is arranged close to the end surface of the shell of the muffler according to any one of claims 1 to 7; or the centrifugal fan is embedded in the clearance space of the shell of the muffler according to claim 8; The back of the air duct plate is also provided with a volute located outside the centrifugal fan; a plurality of flow channels are arranged in the area surrounded by the volute, and an air supply port is arranged at the end of each flow channel.

10. A refrigerator, characterized in that: The invention provides an air duct assembly as claimed in claim 9.

Images