Silencer and air conditioner

Abstract

The utility model provides a silencer and an air conditioner, the silencer comprises an outer cylinder and an inner cylinder, the outer cylinder comprises an inlet pipe, an expansion chamber and an outlet pipe which are connected in sequence; the inner barrel is connected into the expansion chamber, openings in the two ends of the inner barrel face the inlet pipe and the outlet pipe respectively, at least part of the inner barrel and the outer barrel are arranged in a spaced mode, and at least part of the inner wall face of the end, close to the inlet pipe, of the inner barrel faces the inlet pipe. The inner cylinder body is arranged in the outer cylinder body, and at least part of the inner wall surface of the inner cylinder body faces the inlet pipe, so that after a refrigerant enters from the inlet pipe, part of the refrigerant is reflected on the inner wall surface of the inner cylinder body and flows towards the inlet pipe to form turbulent flow, and the turbulent flow is mixed with a subsequently entering refrigerant and flows forwards; as the process of introducing the refrigerant is repeated, the flow speed of the refrigerant is integrally reduced, and a better silencing effect is achieved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a muffler and an air conditioner. Background Technology

[0002] When an air conditioner is running, the periodic exhaust from the compressor causes noise to be transmitted into the room via the refrigerant. Silencers are typically added to the air conditioning piping to reduce noise. A silencer is a structure that uses abrupt changes in cross-section to reduce refrigerant pressure and flow velocity, thereby attenuating pulsating energy. Currently, most silencers use a simple expansion chamber structure, which has limited attenuation of pulsating energy and relatively poor noise reduction effect. Utility Model Content

[0003] This utility model provides a silencer and an air conditioner to solve the technical problem of poor noise reduction effect of silencers.

[0004] To achieve the above objectives, the silencer proposed in this application includes an outer cylinder and an inner cylinder, wherein the outer cylinder includes an inlet pipe, an expansion chamber, and an outlet pipe connected in sequence.

[0005] The inner cylinder is connected to the expansion chamber. The two ends of the inner cylinder are respectively positioned facing the inlet pipe and the outlet pipe. At least a portion of the inner cylinder is spaced apart from the outer cylinder. There is an angle between the inner wall surface of the end of the inner cylinder near the inlet pipe and the air intake direction of the inlet pipe. The angle is greater than 0 degrees and less than 180 degrees.

[0006] Optionally, in one embodiment, the two ends of the inner cylinder are connected to the outer cylinder, and the cross-sectional area of ​​the inner cylinder gradually decreases and then gradually increases along the direction away from the two ends of the inner cylinder.

[0007] Optionally, in one embodiment, the inner cylinder has a first end and a second end opposite to each other, the first end facing the inlet pipe and connected to the expansion chamber, the second end being spaced apart from the outer cylinder along a direction away from the first end, the cross-sectional area of ​​the first end being larger than the cross-sectional area of ​​the second end, and the inner wall surface of the inner cylinder connecting the first end and the second end facing the inlet pipe.

[0008] Optionally, in one embodiment, the cross-section of the inner cylinder gradually decreases along the direction from the first end to the second end.

[0009] Optionally, in one embodiment, the inner cylinder is provided with multiple portions spaced apart along the direction from the inlet pipe to the outlet pipe.

[0010] Optionally, in one embodiment, the cross-sectional area of ​​the expansion chamber is larger than that of the inlet pipe and the outlet pipe;

[0011] The silencer also includes a flow-retarding chamber connected between the inlet pipe and the expansion chamber, the cross-sectional area of ​​which gradually increases along the direction from the inlet pipe toward the expansion chamber.

[0012] Optionally, in one embodiment, the inner cylinder is provided with through-holes for silencing, and multiple silencing holes are spaced apart along the axial and circumferential directions of the inner cylinder.

[0013] Optionally, in one embodiment, the inner wall surface of the inner cylinder is an arc-shaped wall surface; along the radial direction of the inner cylinder, the arc-shaped wall surface protrudes in the direction from the outer cylinder to the inner cylinder, or in the direction from the inner cylinder to the outer cylinder.

[0014] Optionally, in one embodiment, the muffler is centrally symmetrical about its central axis; and / or, the muffler is symmetrical about a symmetrical plane, which is a cross-section of the muffler located at halfway along the direction from the inlet pipe to the outlet pipe.

[0015] This application also proposes an air conditioner including the silencer described above.

[0016] The silencer provided in this application has an inner cylinder with at least one inner wall facing the inlet pipe inside the outer cylinder. When at least part of the refrigerant entering the outer cylinder comes into contact with the inner cylinder, it is reflected in the direction towards the inlet pipe, the refrigerant flow velocity is reduced and turbulence is formed. The turbulence mixes with the refrigerant that enters later, reducing the overall refrigerant flow velocity and thus improving the silencer's noise reduction effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of one type of inner cylinder structure in the muffler of this application;

[0019] Figure 2 This is a schematic diagram of another inner cylinder structure in the muffler of this application;

[0020] Figure 3 The simulation results show the noise reduction of the muffler.

[0021] Explanation of icon numbers:

[0022] 1. Outer cylinder; 11. Inlet pipe; 12. Expansion chamber; 13. Outlet pipe; 14. Flow retardation chamber; 2. Inner cylinder; 21. Silencing hole.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0025] This application provides a muffler to solve the problem of poor noise reduction effect of mufflers. The following description will be provided in conjunction with the accompanying drawings.

[0026] In the embodiments of this application, such as Figure 1 As shown, the silencer includes an outer cylinder 1 and an inner cylinder 2. The outer cylinder 1 includes an inlet pipe 11, an expansion chamber 12, and an outlet pipe 13 connected in sequence.

[0027] The inner cylinder 2 is connected to the expansion chamber 12. The two ends of the inner cylinder 2 are respectively set towards the inlet pipe 11 and the outlet pipe 13. At least a part of the inner cylinder 2 is spaced apart from the outer cylinder 1. There is an angle between the inner wall surface of the end of the inner cylinder 2 that is close to the inlet pipe 11 and the air intake direction of the inlet pipe 11. The angle is greater than 0 degrees and less than 180 degrees.

[0028] It should be noted that the angle between the inner wall surface of the inner cylinder 2 near the inlet pipe 11 and the air intake direction of the inlet pipe 11 means that the refrigerant gas entering from the inlet pipe 11 can be reflected by the inner wall surface of the inlet pipe 11. Preferably, this angle is obtuse, which facilitates the diffusion of the reflected refrigerant gas into the inner cylinder 2. When the inner wall surface of the inner cylinder 2 near the inlet pipe 11 is curved, the angle between different positions on the curved surface and the air intake direction of the inlet pipe 11 will not be equal, but all must be within the range of greater than 0 degrees and less than 180 degrees. The inner cylinder 2 refers to a hollow structure with openings at both ends.

[0029] It is understandable that the expansion chamber 12 refers to a structure whose cross-section suddenly increases relative to the inlet pipe 11. By setting an inner cylinder 2 inside the outer cylinder 1, and designing at least a portion of the inner wall of the inner cylinder 2 to face the inlet pipe 11, after the refrigerant enters from the inlet pipe 11, some of the refrigerant is reflected on the inner wall of the inner cylinder 2 and flows towards the inlet pipe 11, forming turbulence. The turbulence mixes with the subsequently entering refrigerant and flows forward. As the refrigerant is introduced, the above process is repeated to reduce the overall refrigerant flow velocity and achieve a better noise reduction effect.

[0030] In some embodiments, as Figure 1 As shown, the two ends of the inner cylinder 2 are connected to the outer cylinder 1. Along the direction away from the two ends of the inner cylinder 2, the cross-sectional area of ​​the inner cylinder 2 first gradually decreases and then gradually increases.

[0031] It should be noted that the cross-sectional area of ​​the inner cylinder 2 refers to the area of ​​the cross-section in the direction perpendicular to the two ends of the inner cylinder 2. It can be understood that, in the direction of refrigerant flow from the inlet pipe 11 to the outlet pipe 13, the volume of refrigerant that can be stored at different cross-sectional positions of the inner cylinder 2 first decreases and then increases. This throttling effect on the refrigerant and enhances turbulence, slowing down the expansion process that occurs when the refrigerant enters the expansion chamber 12 with a sudden increase in cross-section from the inlet pipe 11, thus reducing the refrigerant pressure and flow velocity. For example, the connection of the two ends of the inner cylinder 2 to the outer cylinder 1 can be such that the inner cylinder 2 is located inside the expansion chamber 12, and the length of the inner cylinder 2 is the same as the length of the expansion chamber 12 (i.e., the two ends of the inner cylinder 2 are respectively connected to the two ends of the expansion chamber 12), or the length of the inner cylinder 2 can be shorter or longer than the expansion chamber 12. Furthermore, the central axis of the inner cylinder 2 can be collinear or non-collinear with the central axis of the expansion chamber 12. When collinear, a through-hole silencing hole 21 is provided on the inner cylinder 2, which serves as a throttling device. When non-collinear, a portion of the refrigerant flows through the inner cylinder 2, and a portion of the refrigerant flows between the inner cylinder 2 and the outer cylinder 1.

[0032] In some embodiments, as Figure 2 As shown, the inner cylinder 2 has a first end and a second end opposite to each other. The first end faces the inlet pipe 11 and is connected to the expansion chamber 12. Along the direction away from the first end, the second end is spaced apart from the outer cylinder 1. The cross-sectional area of ​​the first end is larger than the cross-sectional area of ​​the second end. The inner wall surface of the inner cylinder 2 that connects the first end and the second end faces the inlet pipe 11.

[0033] It should be noted that the first end and the second end of the inner cylinder 2 refer to the two openings respectively facing the inlet pipe 11 and the outlet pipe 13. It can be understood that after the refrigerant is turbulent in the inner cylinder 2, it enters the expansion chamber 12 through the second end. Due to the sudden change in volume, the kinetic energy of the refrigerant is attenuated again, reducing the refrigerant flow rate and improving the noise reduction effect.

[0034] In some embodiments, as Figure 2 As shown, the cross-section of the inner cylinder 2 gradually decreases along the direction from the first end to the second end. It can be understood that a gradual decrease in cross-section helps to reduce or minimize the kinetic energy generated when throttling the refrigerant.

[0035] In some embodiments, as Figure 2 As shown, multiple inner cylinders 2 are spaced apart along the direction from the inlet pipe 11 to the outlet pipe 13. It can be understood that by having multiple spaced inner cylinders 2, the turbulence of the refrigerant inside the silencer is further increased, and the refrigerant flow rate is reduced.

[0036] In some embodiments, as Figure 1 and Figure 2 As shown, the cross-sectional area of ​​the expansion chamber 12 is larger than that of the inlet pipe 11 and the outlet pipe 13;

[0037] The silencer also includes a flow-retarding chamber 14 connected between the inlet pipe 11 and the expansion chamber 12, the cross-sectional area of ​​which gradually increases along the direction from the inlet pipe 11 to the expansion chamber 12.

[0038] It is understandable that, in this way, at least part of the inner wall surface of the inner cylinder 2 faces the slow flow chamber 14. When the refrigerant enters the slow flow chamber 14 through the inlet pipe 11, it expands due to the sudden change in volume and immediately flows into the inner cylinder 2. Then, after being reflected by the inner wall surface of the inner cylinder 2, turbulence is formed in the slow flow chamber 14. Due to the structural characteristics of the slow flow chamber 14, turbulence can be enhanced and the noise reduction effect can be improved.

[0039] In some embodiments, as Figure 1 and Figure 2 As shown, the inner cylinder 2 is provided with through-holes 21, and multiple through-holes 21 are spaced apart along the axial and circumferential directions of the inner cylinder 2. It is understood that during the flow of refrigerant through the through-holes 21, friction occurs with the hole walls, causing some of the refrigerant's kinetic energy to be converted into heat, thus attenuating the refrigerant's energy. For example, when both ends of the inner cylinder 2 are connected to both ends of the expansion chamber 12, and the inner cylinder 2 and the expansion chamber 12 are coaxially arranged, some refrigerant flows through the through-holes 21 into the space between the inner cylinder 2 and the inner walls of the expansion chamber 12. After being reflected on the inner wall of the expansion chamber 12, it enters the inner cylinder 2 through the through-holes 21 and merges with the main flow at different angles, slowing down the main flow velocity and reducing the refrigerant's kinetic energy. For example, the through-holes 21 can be circular, square, spindle-shaped, or a combination of the above.

[0040] In some embodiments, as Figure 1 and Figure 2 As shown, the inner wall of the inner cylinder 2 is an arc-shaped wall; along the radial direction of the inner cylinder 2, the arc-shaped wall protrudes in the direction from the outer cylinder 1 to the inner cylinder 2, or in the direction from the inner cylinder 2 to the outer cylinder 1.

[0041] It should be noted that when the curved wall protrudes from the outer cylinder 1 towards the inner cylinder 2, the inner cylinder 2 exhibits a hyperbolic structure, such as... Figure 1 As shown; when the arc-shaped wall protrudes from the inner cylinder 2 towards the outer cylinder 1, the inner cylinder 2 presents a bowl-shaped structure, as... Figure 2 As shown. It can be understood that the curved wall causes the refrigerant to generate waves with opposite phases after reflection. These waves couple and cancel each other out, thus better reducing noise.

[0042] For example, when the inner cylinder 2 has a hyperbolic structure, the two ends of the inner cylinder 2 are connected to the two ends of the expansion chamber 12; when the inner cylinder 2 has a bowl-shaped structure, multiple inner cylinders 2 are spaced apart in the expansion chamber 12.

[0043] In some embodiments, as Figure 1 As shown, the muffler is arranged symmetrically about its central axis; and / or, the muffler is arranged symmetrically about a symmetrical plane, which is a cross-section located at halfway along the direction from the inlet pipe 11 to the outlet pipe 13 of the muffler.

[0044] It should be noted that the muffler's symmetrical design about its central axis means that after rotating one full revolution around its central axis, the muffler still overlaps with its original structure. This symmetrical structure ensures consistent noise reduction throughout the muffler.

[0045] Furthermore, a flow-retarding chamber 14 is provided between the outlet pipe 13 and the expansion chamber 12. The cross-sectional area of ​​the flow-retarding chamber 14 gradually decreases along the direction from the expansion chamber 12 to the outlet pipe 13. It is understood that in this application, the flow-retarding chambers 14 all adopt a hollow frustum-shaped structure.

[0046] In some embodiments, as Figure 1 and Figure 2 As shown, along the direction from the inlet pipe 11 to the outlet pipe 13, the distance between the inner cylinder 2 and the inner wall of the expansion chamber 12 gradually increases. It can be understood that, following the direction of refrigerant flow, the space between the inner cylinder 2 and the inner wall of the expansion chamber 12 can accommodate more reflected airflow, thus improving the noise reduction effect.

[0047] In some embodiments, as Figure 1 As shown, a flow-retarding chamber 14 is provided between the expansion chamber 12 and the inlet pipe 11, and between the expansion chamber 12 and the outlet pipe 13. The cross-sectional area of ​​the flow-retarding chamber 14 decreases in the direction away from the expansion chamber 12. The inner cylinder 2 is located inside the expansion chamber 12, and the length of the inner cylinder 2 is shorter than the length of the expansion chamber 12. The inner cylinder 2 has a hyperbolic structure. It can be understood that there is a certain distance between both ends of the inner cylinder 2 and the two flow-retarding chambers 14, ensuring that there is a large space for the refrigerant to enter the inner cylinder 2, so as to accommodate the subsequent air intake and the reflected turbulence.

[0048] This application also provides an air conditioner with the above-mentioned silencer. The specific structure of the silencer is as described in the above embodiments. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0050] Noise reduction simulation test:

[0051] Regarding the silencer in the related technology, in this application Figure 1 as well as Figure 2 The noise reduction of the muffler with the structure shown was simulated, where Figure 1 The muffler shown is muffler one. Figure 2 The muffler shown is muffler two, for distinction. Simulation results are as follows. Figure 3 As shown. From Figure 3 As can be seen, compared with the silencers in related technologies, the peak area of ​​silencer 1 and silencer 2 designed in this application is significantly increased in the 100-5000Hz frequency band, which means that the noise reduction is significantly increased and the noise reduction effect is better.

[0052] The silencer provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A silencer, characterized in that, It includes an outer cylinder (1) and an inner cylinder (2), wherein the outer cylinder (1) includes an inlet pipe (11), an expansion chamber (12) and an outlet pipe (13) connected in sequence; The inner cylinder (2) is connected to the expansion chamber (12). The two ends of the inner cylinder (2) are respectively facing the inlet pipe (11) and the outlet pipe (13). At least a portion of the inner cylinder (2) is spaced apart from the outer cylinder (1). There is an angle between the inner wall surface of the inner cylinder (2) near the inlet pipe (11) and the air intake direction of the inlet pipe (11). The angle is greater than 0 degrees and less than 180 degrees.

2. The silencer according to claim 1, characterized in that, The two ends of the inner cylinder (2) are connected to the outer cylinder (1). Along the direction away from the two ends of the inner cylinder (2), the cross-sectional area of ​​the inner cylinder (2) first gradually decreases and then gradually increases.

3. The silencer according to claim 1, characterized in that, The inner cylinder (2) has a first end and a second end opposite to each other. The first end faces the inlet pipe (11) and is connected to the expansion chamber (12). The second end is spaced apart from the outer cylinder (1) along the direction away from the first end. The cross-sectional area of ​​the first end is larger than that of the second end. The inner wall surface of the inner cylinder (2) connecting the first end and the second end faces the inlet pipe (11).

4. The silencer according to claim 3, characterized in that, Along the direction from the first end to the second end, the cross-section of the inner cylinder (2) gradually decreases.

5. The silencer according to claim 3, characterized in that, Along the direction from the inlet pipe (11) to the outlet pipe (13), the inner cylinder (2) is provided with a plurality of such units at intervals.

6. The silencer according to any one of claims 1-5, characterized in that, The cross-sectional area of ​​the expansion chamber (12) is larger than that of the inlet pipe (11) and the outlet pipe (13); The silencer also includes a flow-retarding chamber (14) connected between the inlet pipe (11) and the expansion chamber (12), the cross-sectional area of ​​which gradually increases along the direction from the inlet pipe (11) toward the expansion chamber (12).

7. The muffler according to any one of claims 1-5, characterized in that, The inner cylinder (2) is provided with a through-hole (21), and multiple holes (21) are provided at intervals along the axial and circumferential directions of the inner cylinder (2).

8. The muffler according to any one of claims 1-5, characterized in that, The inner wall of the inner cylinder (2) is an arc-shaped wall; along the radial direction of the inner cylinder (2), the arc-shaped wall protrudes in the direction from the outer cylinder (1) to the inner cylinder (2), or in the direction from the inner cylinder (2) to the outer cylinder (1).

9. The silencer according to claim 1, characterized in that, The muffler is arranged symmetrically about its central axis; and / or, the muffler is arranged symmetrically about a symmetrical plane, which is a cross-section of the muffler located at halfway along the direction from the inlet pipe (11) to the outlet pipe (13).

10. An air conditioner, characterized in that, Includes the silencer as described in any one of claims 1-9.

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