Pipeline silencing assembly and air conditioning unit

Abstract

The utility model provides a pipeline silencing assembly and an air conditioning unit. The pipeline silencing assembly comprises a main pipe body. A silencing housing; and a communicating pipe. According to the pipeline silencing assembly and the air conditioning unit, the size of the silencing shell can be set according to the frequency of low-frequency noise so that the noise reduction effect can be guaranteed, meanwhile, the structural stability of the silencing shell and the main pipe body can be guaranteed, the silencing cavity and the main pipe body are communicated through the communicating pipe, and the noise reduction effect is improved. The noise elimination effect of the noise elimination cavity can be guaranteed, the position of the noise elimination shell and the space needed by the pipeline noise elimination assembly can be further adjusted by adjusting the shape of the communicating pipe, the adaptability of the pipeline noise elimination assembly to the space is improved, and in order to eliminate low-frequency noise, the noise elimination effect of the noise elimination cavity is improved. The size of the communicating pipe can be adjusted to further reduce the size of the silencing cavity, and at the moment, the space occupied by the pipeline silencing assembly on the air conditioning unit can be further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of silencer structures, in particular to a pipeline silencer component and an air-conditioning unit. Background Art

[0002] Installing a silencer on the air conditioner outdoor unit piping system is a common noise reduction method. Currently used silencers are typically of the resistant expansion type (such as resonant silencers). The principle of a resonant silencer is to convert the friction and resistance of the resonance cavity during resonance into heat energy, thereby achieving the purpose of noise reduction. For example, the classic Helmholtz resonance cavity adds a resonance cavity next to the main pipe, which occupies a large volume and has vibration stability issues. Another type of perforated resonant silencer has a thin wall thickness at the perforation. To eliminate low-frequency noise, the volume of the resonance cavity must be increased, which also requires a certain amount of installation space and has usage drawbacks. This type of silencer uses the reflection and interference caused by the expansion and contraction of the pipe's cross-section to achieve noise reduction. It is effective for silencing medium and high-frequency noise, but has limited effect on low-frequency noise.

[0003] For air conditioners with the most commonly used rotary compressors, the noise problem at 1 and 2 times the compressor operating frequency is very prominent, and the noise peak is generally below 200Hz. To eliminate this low-frequency noise, the use of a resistant expansion silencer must ensure that the expansion chamber is of sufficient length. However, in actual use, the space of the outdoor unit is limited and it is difficult to meet the installation requirements of the resistant expansion silencer, resulting in the outdoor unit occupying a large space and having poor structural stability. Utility Model Content

[0004] In order to solve the technical problem in the prior art that the resonance silencer is applied to the outdoor unit, resulting in the outdoor unit occupying a large space and having poor structural stability, a pipe silencer assembly and an air-conditioning unit are provided, in which a silencer cavity is arranged on the main pipe body and the shape and size of the connecting pipe can be adjusted to reduce the occupied space and improve the structural stability while ensuring the silencer effect of low-frequency noise.

[0005] A pipeline silencer assembly, comprising:

[0006] Main body;

[0007] A silencer housing, wherein the silencer housing is sleeved on the main pipe body, and a silencer cavity is formed between the silencer housing and the main pipe body;

[0008] A communicating pipe, wherein a first end of the communicating pipe is communicated with the main body, and a second end of the communicating pipe is communicated with the muffler chamber.

[0009] The sound-absorbing shell includes a first end plate and a side plate connected to each other. The first end plate is located at the end of the side plate. The connection position between the second end and the sound-absorbing shell is located on the side plate. The first end plate is located between the second end and the first end.

[0010] The minimum distance L4 between the second end and the first end plate has a value range of 0<L4<2mm.

[0011] The relationship between the diameter d2 of the muffler shell and the diameter d1 of the main body is: 1.5d1≤d2≤4d1.

[0012] The relationship between the diameter dc of the connecting pipe and the diameter d1 of the main body is: 2mm≤d3≤0.5d1.

[0013] The relationship between the length lc of the connecting pipe and the diameter dc of the connecting pipe is:

[0014]

[0015] Where f is the target muffler frequency; S is the cross-sectional area of ​​the connecting pipe; c is the sound velocity of the fluid; and V is the volume of the muffler chamber.

[0016] The connecting pipe includes a first straight pipe section, a second straight pipe section and a third straight pipe section, the first straight pipe section, the second straight pipe section and the third straight pipe section are connected in sequence to form a U-shape, the end of the first straight pipe section away from the second straight pipe section constitutes the first end of the connecting pipe, the end of the third straight pipe section away from the second straight pipe section constitutes the second end of the connecting pipe, the central axis of the first straight pipe section and the central axis of the third straight pipe section are both perpendicular to the central axis of the main pipe body; and / or the central axis of the second straight pipe section is parallel to the central axis of the main pipe body.

[0017] The connection position between the first straight pipe section and the second straight pipe section has a smooth transition; and / or the connection position between the second straight pipe section and the third straight pipe section has a smooth transition.

[0018] The pipeline silencer assembly has a use state. When the pipeline silencer assembly is in the use state, the central axis of the main pipe body and the vertical plane are parallel to each other, and the first end is located below the silencer shell.

[0019] An air conditioning unit comprises the above-mentioned pipeline silencer assembly.

[0020] The pipe silencer assembly and air-conditioning unit provided by the present invention can effectively reduce the space occupied by the silencer shell by mounting the silencer shell on the main body, and can set the size of the silencer shell according to the frequency of low-frequency noise to ensure the noise reduction effect, while also ensuring the structural stability of the silencer shell and the main body. The silencer chamber is connected with the main body by a connecting pipe, which can ensure the noise elimination effect of the silencer chamber. The position of the silencer shell and the space required by the pipe silencer assembly can also be further adjusted by adjusting the shape of the connecting pipe, thereby improving the adaptability of the pipe silencer assembly to the space. In order to eliminate low-frequency noise, the volume of the silencer chamber can be further reduced by adjusting the size of the connecting pipe, and the space occupied by the pipe silencer assembly for the air-conditioning unit can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a pipeline silencer assembly provided in an embodiment of the present utility model;

[0022] Figure 2 A cross-sectional view of a pipeline silencer assembly provided in an embodiment of the present utility model;

[0023] Figure 3 Another structural schematic diagram of the pipeline silencer assembly provided by an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the transmission loss curve of the pipeline silencer assembly provided in an embodiment of the present utility model;

[0025] In the picture:

[0026] 1. Main pipe body; 2. Silencer shell; 3. Silencer chamber; 4. Connecting pipe; 41. First end; 42. Second end; 21. First end plate; 22. Side plate; 43. First straight pipe section; 44. Second straight pipe section; 45. Third straight pipe section. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate for the embodiments of the present invention described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatuses.

[0030] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "set," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] Installing a silencer on the air conditioner outdoor unit piping system is a common noise reduction method. Currently used silencers are typically of the resistant expansion type (such as resonant silencers). The principle of a resonant silencer is to convert the friction and resistance of the resonance cavity during resonance into heat energy, thereby achieving the purpose of noise reduction. For example, the classic Helmholtz resonance cavity adds a resonance cavity next to the main pipe, which occupies a large volume and has vibration stability issues. Another type of perforated resonant silencer has a thin wall thickness at the perforation. To eliminate low-frequency noise, the volume of the resonance cavity must be increased, which also requires a certain amount of installation space and has usage drawbacks. This type of silencer uses the reflection and interference caused by the expansion and contraction of the pipe's cross-section to achieve noise reduction. It is effective for silencing medium and high-frequency noise, but has limited effect on low-frequency noise.

[0033] For the most commonly used rotary compressor air conditioner at present, the noise problem at 1 and 2 times of the compressor operating frequency is very prominent, and the noise peak is generally below 200Hz. To eliminate this low-frequency noise, the expansion chamber must be of sufficient length when using a resistant expansion muffler. However, in actual use, the space of the outdoor unit is limited and it is difficult to meet the installation requirements of the resistant expansion muffler, resulting in the outdoor unit occupying a large space and having poor structural stability. To this end, the present application provides a method such as Figures 1 to 4 The pipeline silencer assembly shown includes: a main body 1, which is used for the normal flow of fluid. Taking the air-conditioning unit as an example, refrigerant flows in the main body 1; a silencer shell 2, which is sleeved on the main body 1, and a silencer cavity 3 is formed between the silencer shell 2 and the main body 1; a connecting pipe 4, wherein the first end 41 of the connecting pipe 4 is connected to the main body 1, and the second end 42 is connected to the silencer cavity 3. The silencer shell 2 is mounted on the main body 1, which can effectively reduce the space occupied by the silencer shell 2. The size of the silencer shell 2 can be set according to the frequency of low-frequency noise to ensure the noise reduction effect. At the same time, the structural stability of the silencer shell 2 and the main body 1 can also be ensured. The silencer chamber 3 is connected with the main body 1 by the connecting pipe 4, which can ensure the noise elimination effect of the silencer chamber 3. The position of the silencer shell 2 and the space required by the pipeline silencer assembly can be further adjusted by adjusting the shape of the connecting pipe 4, thereby improving the adaptability of the pipeline silencer assembly to the space. In order to eliminate low-frequency noise, the volume of the silencer chamber 3 can be further reduced by adjusting the size of the connecting pipe 4. At this time, the space occupied by the pipeline silencer assembly for the air-conditioning unit can be further reduced.

[0034] During use, main body 1 is in a refrigerant heat exchange cycle, with refrigerant flowing through it. Some of this refrigerant can pass through connecting pipe 4 and into silencing chamber 3, generating resonance within silencing chamber 3, thereby achieving the desired noise reduction. For noises of a certain frequency to be eliminated, the volume V of silencing chamber 3 and the length L of connecting pipe 4 are inversely proportional. When the space available for installing silencing housing 2 is limited, the length L of connecting pipe 4 can be increased, thereby reducing the volume V of silencing chamber 3 and the size of silencing housing 2. This achieves the desired noise reduction while also reducing the space occupied by the pipe silencing assembly within the air conditioning unit.

[0035] The pipe silencing assembly has an in-use state. When the pipe silencing assembly is in the in-use state, the central axis of the main body 1 is parallel to the vertical plane, and the first end 41 is located below the silencing housing 2. That is, the main body 1 is arranged vertically, and the central axis of the silencing housing 2 is also vertical. The fluid in the main body 1 flows in the vertical direction, while part of the fluid can be diverted to enter the connecting pipe 4 and finally enter the silencing chamber 3 for resonance silencing.

[0036] The muffler housing 2 includes a first end plate 21 and a side plate 22 connected to each other. The first end plate 21 is located at the end of the side plate 22. The second end 42 is connected to the muffler housing 2 at the side plate. The first end plate 21 is located between the second end 42 and the first end 41. When the pipe muffler assembly is in use, the second end 42, the first end plate 21, and the first end 41 are arranged vertically in that order. At this time, the connecting pipe 4 is connected to the muffler chamber 3 through the side plate of the muffler housing 2. By limiting the connection direction between the connecting pipe 4 and the muffler chamber 3, the fluid entering the muffler chamber 3 through the connecting pipe 4 can reliably resonate within the muffler chamber 3, thereby ensuring the muffler effect of the muffler chamber 3.

[0037] Among them, the minimum spacing L4 between the second end 42 and the first end plate 21 has a value range of 0<L4<2mm. By limiting L4, the second end 42 needs to have a certain spacing from the first end plate 21 to ensure the reliability of the connection between the second end 42 and the side plate. At the same time, it is also necessary to avoid the value of L4 being too large, which may cause the fluid to accumulate near the first end plate 21 and affect the silencer effect and the heat exchange efficiency of the air-conditioning unit where the main body 1 is located. In particular, when the pipeline silencer assembly is applied to the air-conditioning unit, the refrigerant flowing in the main body 1 may be entrained with lubricating oil. When the lubricating oil enters the silencer chamber 3, an excessively large L4 will cause the lubricating oil to accumulate in the silencer chamber 3, affecting the silencer effect of the silencer chamber 3 and the working reliability of the air-conditioning unit.

[0038] The relationship between the diameter d2 of the sound-absorbing housing 2 and the diameter d1 of the main body 1 is: 1.5d1≤d2≤4d1. When d2 is too large, the size of the sound-absorbing housing 2 is too large, which increases the space occupied by the air conditioning unit. When d2 is too small, the volume of the formed sound-absorbing cavity 3 is small, and the noise cancellation effect is poor. Only when 1.5d1≤d2≤4d1 can the noise cancellation effect be met while minimizing the space occupied by the sound-absorbing housing 2.

[0039] The relationship between the diameter dc of the connecting tube 4 and the diameter d1 of the main body 1 is: 2mm≤d3≤0.5d1. When d3 is too large, since d3 is inversely proportional to the volume of the silencing chamber 3, after the target muffling frequency is determined, the volume of the silencing chamber 3 is too small to reliably muffle and reduce noise. When d3 is too small, the fluid cannot reliably enter the silencing chamber 3 through the connecting tube 4, and the muffling and noise reduction effect of the silencing chamber 3 cannot be guaranteed. Only when 2mm≤d3≤0.5d1 can the fluid reliably enter the silencing chamber 3 while ensuring that the volume of the silencing chamber 3 is sufficient to eliminate noise.

[0040] The relationship between the length lc of the connecting pipe 4 and the diameter dc of the connecting pipe 4 is:

[0041]

[0042] Where f is the target muffler frequency; S is the cross-sectional area of ​​the connecting tube 4; c is the velocity of sound (the speed at which sound propagates in the fluid); and V is the volume of the muffler chamber 3. lc refers to the distance the fluid flows between the first end 41 and the second end 42 of the connecting tube 4. After determining the target muffler frequency and the dimensions of the muffler housing 2 within the available space, the volume V of the muffler chamber 3 can be determined using the above formulas. Then, the shape of the connecting tube 4 can be configured to suit the space requirements.

[0043] like Figure 1 As shown, the connecting pipe 4 includes a first straight pipe section 43, a second straight pipe section 44 and a third straight pipe section 45. The first straight pipe section 43, the second straight pipe section 44 and the third straight pipe section 45 are connected in sequence to form a U-shape. The end of the first straight pipe section 43 away from the second straight pipe section 44 constitutes the first end 41 of the connecting pipe 4, and the end of the third straight pipe section 45 away from the second straight pipe section 44 constitutes the second end 42 of the connecting pipe 4. The central axis of the first straight pipe section 43 and the central axis of the third straight pipe section 45 are both perpendicular to the central axis of the main body 1, which facilitates the connection between the first straight pipe section 43 and the third straight pipe section 45 and the main body 1, and also enables the fluid entering the silencer chamber 3 through the connecting pipe 4 to reliably resonate in the silencer chamber 3, thereby ensuring the silencer effect of the silencer chamber 3.

[0044] The central axis of the second straight pipe section 44 is parallel to the central axis of the main pipe body 1, which reduces the change in the flow direction of the fluid in the connecting pipe 4, improves the resonance effect of the fluid entering the silencer chamber 3, and ensures the silencer effect of the silencer chamber 3.

[0045] The connection position of the first straight pipe section 43 and the second straight pipe section 44 has a smooth transition, which reduces the flow resistance of the fluid in the connecting pipe 4. Preferably, an arc-shaped pipe section is set at the connection position of the first straight pipe section 43 and the second straight pipe section 44, and the radius of the arc-shaped pipe section is R1, which is proportional to the diameter dc of the connecting pipe 4.

[0046] The connection position between the second straight pipe section 44 and the third straight pipe section 45 has a smooth transition, which reduces the flow resistance of the fluid in the connecting pipe 4. Preferably, an arc-shaped pipe section is set at the connection position between the third straight pipe section 45 and the second straight pipe section 44, and the radius of the arc-shaped pipe section is R1, which is proportional to the diameter dc of the connecting pipe 4.

[0047] The length of the first straight pipe section 43 is L1, the length of the second straight pipe section 44 is L2, and the length of the third straight pipe section 45 is L3. Then, the length Lc of the connecting pipe 4 is Lc=L1+L2+L3+πR1.

[0048] Example

[0049] Taking a rotor compressor with a 50Hz power supply frequency as an example, the actual operating frequency is 48Hz, which has a noise problem of 96Hz double frequency. The main pipe in the pipe silencer assembly is connected to the exhaust pipe of the compressor to achieve noise reduction. The specific design method is as follows:

[0050] The target mute frequency f is determined to be 96 Hz, and the speed of sound c of the R32 refrigerant is approximately 180 m / s;

[0051] Determine the initial size:

[0052] The outer diameter of the main body 1 is 12 mm and the wall thickness is 1 mm;

[0053] The specifications of the connecting pipe 4 are a diameter of dc6mm, a wall thickness of 0.5mm, and a bending radius R1 of 10mm;

[0054] The outer diameter of the silencer housing 2 is 30 mm and the wall thickness is 1 mm;

[0055] According to the above formula and the air conditioning volume requirements, the final structural parameters are determined: the length L1 of the first straight pipe section 43 and the length L2 of the second straight pipe section 44 in the connecting pipe 4 are both 20 mm, the length L3 of the third straight pipe section 45 is 11 mm, and the length L5 of the silencer shell 2 is 40 mm.

[0056] By simulating the noise transmission loss curve ( Figure 4) It can be seen that the maximum sound attenuation frequency is 96Hz, the maximum sound attenuation volume is 27.8dB, and the sound attenuation volume between 90-105Hz is more than 10dB.

[0057] An air conditioning unit comprises the above-mentioned pipeline silencer assembly.

[0058] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A pipeline silencer assembly, characterized by: include: Main body (1); A silencer housing (2), wherein the silencer housing (2) is sleeved on the main pipe (1), and a silencer cavity (3) is formed between the silencer housing (2) and the main pipe (1); A connecting pipe (4), wherein a first end (41) of the connecting pipe (4) is connected to the main body (1), and a second end (42) of the connecting pipe (4) is connected to the muffler chamber (3).

2. The pipeline silencer assembly according to claim 1, characterized in that: The muffler housing (2) comprises a first end plate (21) and a side plate (22) connected to each other, wherein the first end plate (21) is located at the end of the side plate (22), the connection position between the second end (42) and the muffler housing (2) is located on the side plate, and the first end plate (21) is located between the second end (42) and the first end (41).

3. The pipeline silencer assembly according to claim 2, characterized in that: The minimum distance L4 between the second end (42) and the first end plate (21) has a value range of 0<L4<2mm.

4. The pipeline silencer assembly according to claim 1, characterized in that: The relationship between the diameter d2 of the muffler housing (2) and the diameter d1 of the main pipe (1) is: 1.5d1≤d2≤4d1.

5. The pipeline silencer assembly according to claim 1, characterized in that: The relationship between the diameter dc of the connecting pipe (4) and the diameter d1 of the main pipe (1) is: 2mm≤d3≤0.5d1.

6. The pipeline silencer assembly according to claim 1, characterized in that: The relationship between the length lc of the connecting pipe (4) and the diameter dc of the connecting pipe (4) is: Wherein, f is the target muffler frequency; S is the cross-sectional area of ​​the connecting pipe (4); c is the sound velocity of the fluid; and V is the volume of the muffler cavity (3).

7. The pipeline silencer assembly according to claim 1, characterized in that: The connecting pipe (4) comprises a first straight pipe section (43), a second straight pipe section (44) and a third straight pipe section (45); the first straight pipe section (43), the second straight pipe section (44) and the third straight pipe section (45) are connected in sequence to form a U-shape; an end of the first straight pipe section (43) away from the second straight pipe section (44) constitutes a first end (41) of the connecting pipe (4); an end of the third straight pipe section (45) away from the second straight pipe section (44) constitutes a second end (42) of the connecting pipe (4); the central axis of the first straight pipe section (43) and the central axis of the third straight pipe section (45) are both perpendicular to the central axis of the main pipe body (1); and / or the central axis of the second straight pipe section (44) is parallel to the central axis of the main pipe body (1).

8. The pipeline silencer assembly according to claim 7, characterized in that: The connection position between the first straight pipe section (43) and the second straight pipe section (44) is smoothly transitioned; and / or the connection position between the second straight pipe section (44) and the third straight pipe section (45) is smoothly transitioned.

9. The pipeline silencer assembly according to claim 1, characterized in that: The pipeline silencer assembly has a use state. When the pipeline silencer assembly is in the use state, the central axis of the main pipe (1) is parallel to the vertical plane, and the first end (41) is located below the silencer shell (2).

10. An air conditioning unit, characterized in that: A pipeline silencer assembly comprising the pipeline silencer assembly according to any one of claims 1 to 9.

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