Silencing device

Abstract

The utility model provides a silencing device which comprises an outer silencer and an inner silencer, the inner silencer is provided with a through hole, and the through hole is communicated with the inner silencer and the outer silencer. The inner silencer is arranged in the outer silencer, airflow flowing between the inner silencer and the outer silencer is achieved through the through holes, high and low frequency noise is eliminated at the same time, and meanwhile the size of the silencing device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a muffler. Background Art

[0002] Mufflers are often used in air conditioners to solve the problem of noise transmission. A relatively long muffler has a greater noise reduction in the low frequency band, while a relatively short muffler has a greater noise reduction in the high frequency band. Currently, two mufflers, one long and one short, are usually connected in series to eliminate high and low frequency noise respectively, but they take up a lot of space and are not conducive to the miniaturization design of air conditioners. Utility Model Content

[0003] The utility model provides a muffler to solve the technical problem that a muffler for eliminating high and low frequency noises occupies a large space.

[0004] To achieve the above-mentioned purpose, the present application proposes a muffler device, comprising an outer muffler and an inner muffler, wherein the outer muffler and the inner muffler are both hollow shells;

[0005] The outer muffler comprises a first inlet pipe, a first expansion chamber and a first outlet pipe connected in sequence, and the inner muffler comprises a second inlet pipe, a second expansion chamber and a second outlet pipe connected in sequence, the cross section of the first expansion chamber is larger than the first inlet pipe and the first outlet pipe, and the cross section of the second expansion chamber is larger than the second inlet pipe and the second outlet pipe;

[0006] Wherein, the inner muffler is sleeved in the first expansion chamber of the outer muffler, and the second inlet pipe is connected to the first inlet pipe, and the inner muffler is provided with a through hole, and the through hole connects the first expansion chamber and the second expansion chamber.

[0007] Optionally, the second inlet pipe is inserted into the first inlet pipe in an interference fit manner, and the second outlet pipe is arranged in the first expansion chamber, so that the refrigerant passes through the second expansion chamber and the first expansion chamber in sequence.

[0008] Optionally, in one embodiment, the second inlet pipe extends to the outside of the outer muffler after passing through the first inlet pipe, and the outer wall of the second inlet pipe is interference-connected with the inner wall of the first inlet pipe to form a seal.

[0009] Optionally, in one embodiment, the second inlet pipe includes a fixed section and a connecting section, the connecting section connecting the fixed section and the second expansion chamber, the outer diameter of the fixed section is larger than the outer diameter of the connecting section; the outer wall of the connecting section is interference fit with the inner wall of the first inlet pipe to form a seal, and the fixed section is located outside the external muffler and abuts against the end of the first inlet pipe away from the first expansion chamber.

[0010] Optionally, in one embodiment, the external muffler includes an end cover and a main body, the main body and the end cover are connected to enclose to form the first expansion chamber, the first inlet pipe is arranged on the end cover, and the first outlet pipe is arranged on the main body.

[0011] Optionally, in one embodiment, a protrusion is provided on the side wall of the first outlet pipe, and the protrusion protrudes toward the inside of the outer muffler.

[0012] Optionally, in one embodiment, the through hole is provided in plurality, and the plurality of through holes are arranged on the side wall of the second expansion chamber.

[0013] Optionally, in one embodiment, the plurality of through holes are arranged in a plurality of rows in a sequentially spaced relationship along the axial direction of the second expansion chamber, and the through holes in each row are arranged in a sequentially spaced relationship along the circumferential direction of the second expansion chamber; along the axial direction of the second expansion chamber, the through holes in two adjacent rows are staggered.

[0014] Optionally, in one embodiment, the spacing between any two adjacent columns of through holes is equal.

[0015] Optionally, in one embodiment, the inner diameter of the first inlet pipe and the inner diameter of the first outlet pipe are both smaller than the inner diameter of the first expansion chamber, and the inner diameter of the second inlet pipe and the inner diameter of the second outlet pipe are both smaller than the inner diameter of the second expansion chamber.

[0016] The present application provides a silencer device, which reduces the volume of the silencer device by placing an inner silencer inside an outer silencer, and realizes airflow between the inner silencer and the outer silencer through a through hole, so that the inner silencer and the outer silencer are used to eliminate noise in different frequency bands respectively, thereby achieving a reduction in the silencer volume without affecting the simultaneous elimination of high and low frequency noises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the silencer device of this application;

[0019] Figure 2 A cross-sectional view of the muffler device of the present application;

[0020] Figure 3 An exploded view of the silencer device of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the inner muffler in the muffler device of this application;

[0022] Figure 5 This is a comparison chart of the sound transmission loss curves of the silencer device of this application and the series silencer.

[0023] Description of Figure Numbers:

[0024] 1. External muffler; 11. First expansion chamber; 12. First inlet pipe; 13. First outlet pipe; 133. Protrusion; 14. End cover; 15. Main body; 2. Internal muffler; 21. Second expansion chamber; 211. Through hole; 22. Second inlet pipe; 221. Fixed section; 222. Connecting section; 23. Second outlet pipe.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] It should be noted that the high-frequency band noise and low-frequency band noise mentioned in this application are relative concepts in comparison of two noise frequency bands, and do not specifically refer to the commonly believed high-frequency band noise and low-frequency band noise.

[0028] The embodiment of the present application provides a muffler to solve the problem that the muffler for simultaneously eliminating high-frequency and low-frequency noise in the related art occupies a large space. The muffler will be described below in conjunction with the accompanying drawings.

[0029] In the embodiments of the present application, Figure 1 and Figure 2 As shown, the muffler device comprises an outer muffler 1 and an inner muffler 2, and both the outer muffler 1 and the inner muffler 2 are hollow shells;

[0030] The outer muffler 1 includes a first inlet pipe 12, a first expansion chamber 11 and a first outlet pipe 13 connected in sequence, and the inner muffler 2 includes a second inlet pipe 22, a second expansion chamber 21 and a second outlet pipe 23 connected in sequence, the cross section of the first expansion chamber 11 is larger than the first inlet pipe 12 and the first outlet pipe 13, and the cross section of the second expansion chamber 21 is larger than the second inlet pipe 22 and the second outlet pipe 23;

[0031] The inner muffler 2 is sleeved in the first expansion chamber 11 of the outer muffler 1 , and the second inlet pipe 22 is connected to the first inlet pipe 12 . The inner muffler 2 is provided with a through hole 211 , which connects the first expansion chamber 11 and the second expansion chamber 21 .

[0032] It should be noted that both the outer muffler 1 and the inner muffler 2 refer to airflow ducts that can reduce noise through sound-absorbing lining or special structural forms. In the present application, the first expansion chamber 11 and the second expansion chamber 21 are used to achieve a sudden increase in the internal volume of the outer muffler and the inner muffler, increase airflow reflection, and achieve a sound-absorbing effect. In this way, the inner muffler 2 is arranged in the first expansion chamber 11 and the through hole 211 is used to achieve airflow between the second expansion chamber 21 and the first expansion chamber 11, thereby achieving the simultaneous elimination of high and low frequency noises while reducing the volume of the muffler.

[0033] In some embodiments, Figure 2 As shown, the second inlet pipe 22 is inserted into the first inlet pipe 12 in an interference fit manner, and the second outlet pipe 23 is arranged in the first expansion chamber 11, so that the refrigerant passes through the second expansion chamber 21 and the first expansion chamber 11 in sequence. In this way, when the silencer is installed in the air conditioner outdoor unit, the air conditioner indoor unit, or between the air conditioner indoor and outdoor units, the refrigerant enters the second expansion chamber 21 through the second inlet pipe 22 to eliminate high-frequency noise, and then enters the first expansion chamber 11 through the through hole 211 and the second outlet pipe 23 to eliminate low-frequency noise, thereby having a good high- and low-frequency noise elimination effect.

[0034] In some embodiments, Figure 2 As shown, the second inlet pipe 22 passes through the first inlet pipe 12 and extends to the outside of the outer muffler 1, and the outer wall of the second inlet pipe 22 is interference-connected with the inner wall of the first inlet pipe 12 to form a seal. In this way, the interference connection plays a role in fixing the position of the inner muffler 2, and ensures that the refrigerant enters the first expansion chamber 11 through the second inlet pipe 22 instead of the first inlet pipe 12. In the actual production and processing process, the inner muffler 2 is arranged in the outer muffler 1 and the second inlet pipe 22 is extended through the first inlet pipe 12, and then the second inlet pipe 22 is expanded to increase the inner diameter, and finally the inner wall of the first inlet pipe 12 is interference-fitted to achieve sealing.

[0035] In some embodiments, Figure 2As shown, the second inlet pipe 22 includes a fixed section 221 and a connecting section 222, the connecting section 222 connects the fixed section 221 and the second expansion chamber 21, the outer diameter of the fixed section 221 is larger than the outer diameter of the connecting section 222; the outer wall of the connecting section 222 is interference-connected with the inner wall of the first inlet pipe 12 to form a seal, and the fixed section 221 is located outside the outer muffler 1 and abuts against the end of the first inlet pipe 12 away from the first expansion chamber 11. In this way, the fixed section 221 with a larger outer diameter can more firmly fix the inner muffler 2. When the second inlet pipe 22 is expanded, the fixed section 221 and the connecting section 222 are formed by different expansion sizes.

[0036] In some embodiments, Figure 3 As shown, the outer muffler 1 includes an end cover 14 and a body member 15, the body member 15 and the end cover 14 are connected to enclose a first expansion chamber 11, the first inlet pipe 12 is arranged on the end cover 14, and the first outlet pipe 13 is arranged on the body member 15. In this way, during installation, the end cover 14 and the body member 15 that are separately arranged can be sleeved on the outside of the inner muffler 2 to form a nested structure of the muffler device, and finally the body member 15 and the end cover 14 are welded and fixed.

[0037] In some embodiments, Figure 2 As shown, a protrusion 133 is provided on the side wall of the first outlet pipe 13, and the protrusion 133 protrudes toward the inside of the outer muffler 1. In this way, the muffler is conveniently connected and fixed to the air conditioning pipeline by using the protrusion 133.

[0038] In some embodiments, Figure 4 As shown, a plurality of through holes 211 are provided, and the plurality of through holes 211 are arranged on the side wall of the second expansion chamber 21. By increasing the number of through holes 211, the noise reduction of low-frequency noise is improved.

[0039] In some specific embodiments, the through hole 211 may be a circular hole, a square hole, or a triangular hole.

[0040] In some embodiments, the plurality of through holes 211 are arranged in a plurality of rows in a sequentially spaced manner along the axial direction of the second expansion chamber 21, and the through holes 211 in each row are arranged in a sequentially spaced manner along the circumference of the second expansion chamber 21; and the through holes 211 in two adjacent rows are arranged in a staggered manner along the axial direction of the second expansion chamber 21. In this way, the airflow evenly enters the first expansion chamber 11 through the evenly distributed through holes 211, thereby improving the noise reduction efficiency of low-frequency noise.

[0041] In some specific embodiments, each column has, for example, five through holes 211 ; among the five through holes 211 in the same column, the central angle between adjacent through holes 211 is 72°.

[0042] In some embodiments, the spacing between any two adjacent columns of through holes 211 is equal. For example, if the through holes 211 in each column are distributed in a distribution plane along a circular direction, the spacing between two adjacent columns of through holes 211 is the spacing between the two distribution planes where the through holes 211 in the two columns are located.

[0043] In some embodiments, the inner diameter of the first inlet pipe 12 and the inner diameter of the first outlet pipe 13 are both smaller than the inner diameter of the first expansion chamber 11, and the inner diameter of the second inlet pipe 22 and the inner diameter of the second outlet pipe 23 are both smaller than the inner diameter of the second expansion chamber 21. In this way, when the refrigerant enters the second expansion chamber 21 and the first expansion chamber 11, the cross-sectional area suddenly increases, causing the noise to reflect and attenuate, thereby achieving the purpose of noise reduction.

[0044] In some specific embodiments, the inner diameter of the first inlet pipe 12 is equal to the inner diameter of the first outlet pipe 13 , and the inner diameter of the second inlet pipe 22 is equal to the inner diameter of the second outlet pipe 23 .

[0045] In some specific embodiments, when the second inlet pipe 22 includes a fixed section 221 and a connecting section 222 , the inner diameter of the connecting section 222 is equal to the inner diameter of the second outlet pipe 23 , and the inner diameter of the first inlet pipe 12 is equal to the inner diameter of the first outlet pipe 13 .

[0046] In some specific embodiments, an outer slope surface is provided between the first inlet pipe 12 and the first expansion chamber 11, and between the first outlet pipe 13 and the first expansion chamber 11, and an inner slope surface is provided between the inner input end and the second expansion chamber 21, and between the first outlet pipe 13 and the second expansion chamber 21. It should be noted that the outer muffler 1 and the inner muffler 2 of the present application are both processed by spinning to form the outer slope surface and the inner slope surface. The length, maximum outer diameter and two-port diameter of the outer muffler 1 and the inner muffler 2 can be calculated and determined according to different noise frequencies.

[0047] In order to better illustrate the technical effect of the silencer provided by the embodiment of the present application, a finite element simulation analysis comparison of the silencer of the embodiment of the present application and the series silencer in the related art is provided here. In the finite element simulation analysis, the series silencer in the related art includes a first silencer and a second silencer connected in series in sequence, one end of the second silencer is connected and communicated with one end of the first silencer, the length of the first silencer is 95mm, the maximum outer diameter of the first silencer is 35mm, the length of the second silencer is 40mm, and the maximum outer diameter of the second silencer is 25mm; and the inner silencer 2 of the silencer of the embodiment of the present application is provided with a plurality of evenly distributed through holes 211, the size of the outer silencer 1 is consistent with the size of the first silencer, and the size of the inner silencer 2 is consistent with the size of the second silencer.

[0048] The simulation analysis results are as follows Figure 5As shown, the sound transmission loss curves, i.e., the sound attenuation curves, of the first muffler, the second muffler, and the muffler of the embodiment of the present application are shown. It can be seen that the sound attenuation of the muffler of the embodiment of the present application is equivalent to that of the first muffler in the low frequency band, and is significantly higher than that of the second muffler in the high frequency band. Therefore, compared with the series muffler in the related art, the muffler of the embodiment of the present application can achieve higher sound transmission loss, i.e., sound attenuation, in different frequency bands.

[0049] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. In the description of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0050] The silencer device provided in the embodiment of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A muffler, characterized in that: It comprises an outer muffler (1) and an inner muffler (2), wherein the outer muffler (1) and the inner muffler (2) are both hollow shells; The outer muffler (1) comprises a first inlet pipe (12), a first expansion chamber (11) and a first outlet pipe (13) connected in sequence, and the inner muffler (2) comprises a second inlet pipe (22), a second expansion chamber (21) and a second outlet pipe (23) connected in sequence, the cross section of the first expansion chamber (11) being larger than the first inlet pipe (12) and the first outlet pipe (13), and the cross section of the second expansion chamber (21) being larger than the second inlet pipe (22) and the second outlet pipe (23); The inner muffler (2) is sleeved in the first expansion chamber (11) of the outer muffler (1), and the second inlet pipe (22) is connected to the first inlet pipe (12); the inner muffler (2) is provided with a through hole (211), and the through hole (211) connects the first expansion chamber (11) and the second expansion chamber (21).

2. A muffler according to claim 1, characterized in that: The second inlet pipe (22) is inserted into the first inlet pipe (12) in an interference fit, and the second outlet pipe (23) is arranged in the first expansion chamber (11), so that the refrigerant passes through the second expansion chamber (21) and the first expansion chamber (11) in sequence.

3. A muffler device according to claim 2, characterized in that: The second inlet pipe (22) passes through the first inlet pipe (12) and then extends to the outside of the outer muffler (1); the outer wall of the second inlet pipe (22) is interference-connected with the inner wall of the first inlet pipe (12) to form a seal.

4. A muffler device according to claim 3, characterized in that: The second inlet pipe (22) comprises a fixed section (221) and a connecting section (222), wherein the connecting section (222) connects the fixed section (221) and the second expansion chamber (21), and the outer diameter of the fixed section (221) is greater than the outer diameter of the connecting section (222); the outer wall of the connecting section (222) is interference-connected with the inner wall of the first inlet pipe (12) to form a seal, and the fixed section (221) is located outside the external muffler (1) and abuts against the end of the first inlet pipe (12) away from the first expansion chamber (11).

5. A muffler device according to claim 2, characterized in that: The external muffler (1) comprises an end cover (14) and a main body (15), wherein the main body (15) and the end cover (14) are connected to enclose the first expansion chamber (11), the first inlet pipe (12) is arranged on the end cover (14), and the first outlet pipe (13) is arranged on the main body (15).

6. A muffler device according to claim 3, characterized in that: A protrusion (133) is provided on the side wall of the first outlet pipe (13), and the protrusion (133) protrudes toward the interior of the outer muffler (1).

7. A muffler device according to claim 1, characterized in that: A plurality of through holes (211) are provided, and the plurality of through holes (211) are arranged on the side wall of the second expansion chamber (21).

8. A muffler device according to claim 7, characterized in that: The plurality of through holes (211) are arranged in a plurality of rows in a sequentially spaced manner along the axial direction of the second expansion chamber (21), and the through holes (211) in each row are arranged in a sequentially spaced manner along the circumferential direction of the second expansion chamber (21); along the axial direction of the second expansion chamber (21), the through holes (211) in two adjacent rows are arranged in a staggered manner.

9. A muffler device according to claim 8, characterized in that: The spacing between any two adjacent rows of through holes (211) is equal.

10. A muffler device according to claim 2, characterized in that: The inner diameter of the first inlet pipe (12) and the inner diameter of the first outlet pipe (13) are both smaller than the inner diameter of the first expansion chamber (11), and the inner diameter of the second inlet pipe (22) and the inner diameter of the second outlet pipe (23) are both smaller than the inner diameter of the second expansion chamber (21).

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