Air conditioner pipeline silencer

Abstract

The utility model discloses an air conditioner pipeline silencer, including home hertz silencer, damping branch, home hertz silencer is connected on main pipeline through damping branch, and damping branch is connected perpendicularly main pipeline, and damping branch includes a bending section, makes home hertz silencer and main pipeline parallelly arranged, the gap between home hertz silencer, main pipeline is provided with support, and the support is used for absorbing vibration and damping, and the support is connected home hertz silencer and main pipeline respectively.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning pipeline noise reduction technology for rolling rotor compressors, and specifically relates to an air conditioning pipeline noise reduction device. Background Technology

[0002] Under traditional heating conditions at high speeds, low-frequency noise, mainly at the second harmonic, often occurs in the indoor unit. Usually, a larger muffler needs to be added to the exhaust to reduce exhaust pulsation and reduce the problem of the second harmonic noise transmitted by the indoor unit.

[0003] like Figure 11 , 12 All existing patents basically use the resonance principle of the resonant cavity to achieve noise reduction. They use an expansion silencer connected in series in the pipeline to achieve noise reduction. However, in actual air conditioning pipelines, the resonant cavity is in a resonant state during noise reduction, and the entire component will vibrate greatly. This can cause the pipe to crack at the installation location, leading to leakage problems and affecting the reliability of equipment operation.

[0004] Compared to the original pipeline, the expansion-type silencer has a larger resonant cavity, a larger volume, and a larger mass. Since both ends are connected to pipelines, when it silences, it causes the entire pipeline at both ends to vibrate, resulting in a larger leakage risk area, reduced reliability, intense vibration, and a wider range of pipeline impact. Utility Model Content

[0005] This application provides an air conditioning pipeline silencing device, including a holmhertz silencer and a vibration damping branch. The holmhertz silencer is connected to the main pipeline through the vibration damping branch, which is perpendicular to the main pipeline. The vibration damping branch includes a curved section to make the holmhertz silencer and the main pipeline parallel to each other. A bracket is provided in the gap between the holmhertz silencer and the main pipeline, and the bracket is connected to the holmhertz silencer and the main pipeline respectively.

[0006] The support frame is used for vibration absorption and damping;

[0007] A bracket is installed at the minimum gap between the Holmhertz silencer and the main pipeline, which is more convenient. Since the Holmhertz silencer and the main pipeline are set in parallel, the gap is uniform, which makes it easy to set up a stop. A bracket is installed to restrict the Holmhertz silencer and the main pipeline together through the support surface.

[0008] The technical solution provided in this application also has the following technical features:

[0009] Preferably, in one embodiment of this application, the diameter of the vibration damping branch is 1 / 6 to 1 / 3 times the diameter of the Holmhertz silencer.

[0010] Preferably, in one embodiment of this application, the length of the vibration damping branch is the total length from the main pipeline inlet to the Holmhertz silencer inlet. The total length needs to include the bends and the straight sections at both ends, with the straight sections at both ends being 10mm to ensure welding at both ends.

[0011] Preferably, in one embodiment of this application, the distance between the Holmhertz silencer and the main pipeline is 25-35mm.

[0012] Preferably, in one embodiment of this application, the pipe diameter of the vibration damping branch is greater than or equal to one-quarter of the pipe diameter of the main pipe and less than or equal to half the pipe diameter of the main pipe.

[0013] Preferably, in one embodiment of this application, the length-to-diameter ratio of the Holmhertz silencer is in the range of 1.2-3.

[0014] Preferably, in one embodiment of this application, the diameter of the Holmhertz silencer is 1.2 to 2.5 times the diameter of the main pipeline.

[0015] Preferably, in one embodiment of this application, the length-to-diameter ratio of the Holmhertz silencer is 2.

[0016] Preferably, in one embodiment of this application, the diameter of the Holmhertz silencer is 1.5 times the diameter of the main pipeline.

[0017] Preferably, in one embodiment of this application, the bracket includes an exhaust pipe connection port, a resonant cavity muffler connection port, and a waistline groove. The exhaust pipe connection port is fitted onto the main pipeline, and the resonant cavity muffler connection port is fitted onto the Holmhertz muffler. The waistline groove is formed on the outside of the bracket to accommodate a fixing strap.

[0018] Preferably, in one embodiment of this application, both the exhaust pipe connection port and the resonant cavity muffler connection port are provided with openings, the opening angle being 25-40°.

[0019] Preferably, in one embodiment of this application, the openings of the exhaust pipe connection port and the resonant cavity muffler connection port are rounded and smooth; the openings of the exhaust pipe connection port and the resonant cavity muffler connection port are oriented on the same side of the bracket.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0021] 1. This application achieves multiple functions, including fixed-point constraint, vibration isolation, structural support, and space optimization, by setting a bracket between the main pipeline and the muffler in the air conditioning system. The muffler adopts a Holmhertz muffler and is connected to the main pipeline through a vibration-damping branch. This method of setting a bracket between the main pipeline and the muffler forms "node isolation" and "resonance chain breaking" for structural vibration, achieving precise vibration reduction and efficient noise reduction, while improving the utilization rate of the internal space of the equipment without damaging the original layout space and the original location of the supporting components.

[0022] 2. This application achieves the goal of reducing the noise transmitted by the second harmonic of the indoor unit by precisely matching the structural dimensions, selecting the best Holmhertz silencer, main pipeline, and vibration damping branch, and matching the bracket for vibration isolation and absorption. Compared with the original modification, it also reduces the required volume space, reduces the required consumables and structural weight, and reduces costs by saving consumables. While improving the original noise reduction and vibration damping performance, it eliminates the risk of leakage caused by structural pipe cracking due to resonance, and realizes product structure optimization. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a perspective view of an air conditioning pipe silencing device according to the present invention;

[0025] Figure 2 This is a perspective view of an air conditioning pipe silencing device according to the present invention;

[0026] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0027] Figure 4 This is a perspective view of a bracket for an air conditioning pipe silencing device according to the present invention;

[0028] Figure 5 This is a top view of a bracket for an air conditioning pipe silencing device according to the present invention;

[0029] Figure 6 This utility model Figure 3 Color illustrations;

[0030] Figure 7 This is a connection diagram of the main pipeline and vibration damping branch pipeline of an air conditioning pipeline silencing device according to this utility model.

[0031] Figure 8 This is a simulation diagram of an air conditioning pipe silencing device according to the present invention;

[0032] Figure 9This is a simulated spectrum diagram of an air conditioning pipe silencing device according to the present invention;

[0033] Figure 10 A schematic diagram illustrating the application of an air conditioning pipe silencing device according to this utility model;

[0034] Figure 11 This is existing technology;

[0035] Figure 12 This is existing technology;

[0036] Components in the diagram:

[0037] 200. Holmhertz silencer

[0038] 300, Supervisor Road

[0039] 400, Vibration-damping branch

[0040] 100. Bracket

[0041] 101. Exhaust pipe connection port

[0042] 102. Resonance cavity silencer connection port

[0043] 103. Waistline groove. Detailed Implementation

[0044] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the scope of this utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0048] like Figure 1-8 10. An air conditioning duct silencing device, comprising a Holmhertz silencer 200 and a vibration damping branch 400, wherein the Holmhertz silencer 200 is connected to the main duct 300 via the vibration damping branch 400, optionally, the vibration damping branch 400 is vertically connected to the main duct 300, and the vibration damping branch 400 includes a curved section to make the Holmhertz silencer 200 and the main duct 300 parallel; a bracket 100 is provided at the minimum gap between the Holmhertz silencer 200 and the main duct 300, the bracket 100 is respectively connected to the Holmhertz silencer 200 and the main duct 300, and the bracket 100 is used for vibration absorption and damping.

[0049] In this application, by setting a support structure between the main air conditioning system 300 and the Holmhertz silencer 200, the combined functions of vibration isolation and space optimization can be effectively achieved. This support 100 not only provides support and positioning for the main air conditioning system 300 and the Holmhertz silencer 200, but also, in conjunction with vibration damping elements such as elastic pads and damping materials, can interrupt the vibration propagation path at structural nodes, suppressing the vibration generated during the operation of the Holmhertz silencer 200, and preventing the Holmhertz silencer 200 from swaying due to vibration transmission caused by its own vibration transmission, thereby improving the stability and reliability of the entire machine.

[0050] The bracket 100 can also be equipped with some elastic pads, and the bracket 100 is formed using damping material;

[0051] The bracket 100 can divide the originally continuous pipeline structure into multiple stiffness zones, significantly improving the natural frequency of the pipeline system, reducing the risk of resonance, and mitigating problems such as weld fatigue and structural loosening caused by vibration during long-term operation, thus helping to extend the service life of the equipment. At the same time, by rationally designing the layout direction and length of the connecting branches and the silencer, the silencer can be precisely aligned with specific sound source areas, improving its noise reduction effect in the low or mid frequency range, achieving more stable and controllable acoustic performance, and realizing the purpose of this application to reduce the transmitted sound of the indoor unit at the second harmonic frequency, etc.

[0052] The bracket 100 features excellent adjustability and compatibility, facilitating efficient layout within the limited installation space of air conditioning equipment. By optimizing the three-dimensional piping path, the bracket can be attached to the equipment frame, housing, or rack structure, saving space and avoiding structural conflicts caused by interference between the silencer and other functional components, thus improving system integration and compactness. This structure also facilitates modular pre-assembly, reducing assembly errors and maintenance costs, and demonstrating excellent engineering implementation and adaptability.

[0053] Specifically, in one embodiment of this application, the diameter of the vibration damping branch 400 is 1 / 6 to 1 / 3 times the diameter of the Holmhertz silencer 200. For example, taking 1 / 6, 1 / 5, 1 / 4, or 1 / 3 times the diameter can all meet the technical requirements.

[0054] The length of the vibration damping branch 400 is the total length from the inlet of the main branch 300 to the inlet of the Holmhertz silencer 200.

[0055] The total length must include the bends and the straight sections at both ends, with the straight sections at both ends being 10mm to ensure welding at both ends;

[0056] In the vibration damping branch 400, the distance between the Holmhertz silencer 200 and the main branch 300 is 25-35mm. If the distance is 25mm, 30mm, or 35mm, it can meet the technical requirements.

[0057] The pipe diameter of the vibration damping branch 400 is greater than or equal to one-quarter of the pipe diameter of the main pipe 300, and less than or equal to half of the pipe diameter of the main pipe 300; if the pipe diameter of the vibration damping branch 400 is one-quarter, one-third, or half of the pipe diameter of the main pipe 300, the technical requirements can be met.

[0058] The length-to-diameter ratio of the Holmhertz silencer 200 is in the range of 1.2-3. Values ​​of 1.2, 1.5, and 3 can all meet the technical requirements.

[0059] The diameter of the Holmhertz silencer 200 is 1.2 to 2.5 times the diameter of the main pipeline 300. If it is 1.2 times, 1.8 times, or 2.5 times, it can meet the technical requirements.

[0060] This application, through screening, provides a range of feasible structural dimensions for the Holmhertz silencer 200, main pipeline 300, and vibration damping branch pipeline 400, which is beneficial to expanding the application scope of this application in air conditioning pipelines.

[0061] Specifically, in one embodiment of this application, the length-to-diameter ratio of the holmhertz silencer 200 is 2; the diameter of the holmhertz silencer 200 is 1.5 times the pipe diameter of the main pipeline 300. Implementing this effectively overcomes the technical defects of low-frequency sound transmission in the indoor unit, while also overcoming the structural leakage risk caused by resonance.

[0062] Specifically, in one embodiment of this application, the bracket 100 includes an exhaust pipe connection port 101, a resonant cavity muffler connection port 102, and a waistline annular groove 103. The exhaust pipe connection port 101 is fitted onto the main pipeline 300, and the resonant cavity muffler connection port 102 is fitted onto the Holmhertz muffler 200. The waistline annular groove 103 is formed on the outer side of the bracket 100 for accommodating a fixing strap.

[0063] Both the exhaust pipe connection port 101 and the resonant cavity muffler connection port 102 are provided with openings, with opening angles of 25-40°. If 25°, 30°, or 40° are used, the technical requirements can be met.

[0064] The openings of the exhaust pipe connection port 101 and the resonant cavity muffler connection port 102 are rounded and smooth; the openings of the exhaust pipe connection port 101 and the resonant cavity muffler connection port 102 are oriented on the same side of the bracket 100.

[0065] Specifically, in one embodiment of this application, an air conditioning pipe silencing device is provided. This application takes into account the component vibration problem when the resonant cavity is working, and reduces the area affected by resonance in the pipe, reduces the connection area, and increases vibration reduction measures.

[0066] This application employs the principle of resonant cavity and designs matching fixing components to fix the vibration cavity, ensuring the normal use of the pipeline and eliminating the problem of breakage due to the operation of the resonant cavity.

[0067] Specifically, in one embodiment of this application, a Holmhertz silencer is used. In the original pipeline group, there are two expansion silencers, one of which adopts the structure of this application, which can reduce pipeline costs, etc.

[0068] The resonant cavity silencer of this application can be easily installed on the pipeline without affecting the space; the design of the resonant cavity fixing scheme can ensure that the pipeline will not break when the resonant cavity is working in resonance.

[0069] Figure 9Based on the simulation test results of this application, a noise reduction scheme was designed to address the low-frequency transmission problem of the Holmhertz muffler, specifically the issue of 2x harmonic noise transmission. This scheme increased low-frequency transmission loss and noise reduction, particularly adding 15dB of noise reduction at 200Hz. It also significantly reduced high-frequency noise in the 1000-1200Hz range, thus improving the transmission noise of the indoor unit. The specific transmission noise can be adjusted using the muffler, and the resonant frequency f is calculated based on the transmission loss theory of the Holmhertz muffler. r :

[0070]

[0071] In the formula:

[0072] V is the volume of the resonant cavity;

[0073] A C This represents the cross-sectional area of ​​the inner hole of the neck connecting tube;

[0074] l c This refers to the length of the connecting pipe;

[0075] C0 is the local speed of sound;

[0076] The natural frequency of a resonant muffler is related to the length and cross-sectional area of ​​the connecting pipe and the volume of the resonant cavity.

[0077] The sound transmission loss TL of a single-section resonant silencer is:

[0078]

[0079] In the formula:

[0080] p t This is the transmitted sound pressure.

[0081] p i The incident sound pressure at the entrance end;

[0082] f is the actual frequency of the sound wave propagating in the pipe;

[0083] A p The cross-sectional area of ​​the main tube;

[0084] The sound transmission loss is related to the resonant frequency and pipe parameters, while the resonant frequency is only related to the cross-sectional area of ​​the connecting pipe, the length of the connecting pipe and the size of the resonant cavity, and is not related to the structure, shape and other factors of the resonant cavity.

[0085] The modeling process does not consider the mass distribution and sound wave motion in the connecting tube and resonant cavity. It requires that the geometric dimensions of the resonant cavity and connecting tube be much smaller than the wavelength at the resonant frequency, and the volume of the connecting tube be much smaller than the volume of the resonant cavity, etc.

[0086] As the volume V increases, the sound transmission loss curve shifts towards lower frequencies, meaning the resonant frequency shifts towards lower frequencies. The longer the connecting tube, the greater the amplitude of the resonant frequency change. Therefore, it is necessary to limit the length of the 200mm Holmhertz silencer appropriately.

[0087] Therefore, the diameter of the vibration damping branch 400 is 1 / 6 to 1 / 3 times the diameter of the Holmhertz silencer 200. Taking 1 / 6, 1 / 5, 1 / 4, or 1 / 3 times the diameter can all meet the technical requirements.

[0088] The length of the vibration damping branch 400 is the total length from the inlet of the main branch 300 to the inlet of the Holmhertz silencer 200. The total length must include the bends and the straight sections at both ends. The straight sections at both ends are 10mm to ensure the welding at both ends.

[0089] In the vibration damping branch 400, the distance between the Holmhertz silencer 200 and the main branch 300 is 25-35mm. If 25mm, 30mm, or 35mm is used, the technical requirements can be met.

[0090] If the pipe diameter of the vibration damping branch 400 is R1, and the pipe diameter of the main branch 300 is R2, then:

[0091]

[0092] The length-to-diameter ratio of the Holmhertz silencer 200 ranges from 1.2 to 3; preferably, the length-to-diameter ratio of the Holmhertz silencer 200 is 2.

[0093] The diameter of the Holmhertz silencer 200 is 1.2 to 2.5 times the pipe diameter of the vibration damping branch 400; preferably, the diameter of the Holmhertz silencer 200 is 1.5 times the pipe diameter of the vibration damping branch 400.

[0094] The technical features of the pipeline silencer in this application are: a resonant cavity silencer is designed on the pipeline, which can be easily installed on the pipeline without affecting the space position; the design of the resonant cavity fixing scheme can ensure that the pipeline will not break when the resonant cavity is working in resonance.

[0095] The noise reduction band is determined by adjusting the resonant cavity volume, the cross-sectional area of ​​the inner hole of the neck connecting tube, and the length of the connecting tube.

[0096] like Figure 1-8 10. The bracket 100 includes an exhaust pipe connection port 101, a resonant cavity muffler connection port 102, and a waistline annular groove 103;

[0097] The waistline groove 103 serves two purposes: one is to provide a fixed position for securing cable ties, making it easier to secure the cable ties.

[0098] The second function is to increase flexibility and facilitate insertion into the pipeline;

[0099] The bracket 100 is made of natural rubber and EPDM rubber; this material can effectively absorb and reduce vibration; ordinary rubber can also be used.

[0100] The opening orientation is chosen to facilitate factory production; openings in the same direction are easier to install and use. Openings facing away from each other (S) are also acceptable.

[0101] Angles A and a are recommended to be 200-290°. 180° may cause the cable tie to come into direct contact with the pipeline. Values ​​of 200°, 245°, and 290° can all meet the technical requirements.

[0102] Angles B and b are recommended to be 30-45°. The angles should not be too large, as this will make installation difficult. Values ​​of 30°, 37.5°, and 45° can all meet the technical requirements.

[0103] In summary, this utility model aims to solve the problem of low-frequency noise transmission from the indoor unit that often occurs under high-speed operation in traditional air conditioning heating mode. It optimizes the low-frequency noise transmission problem, such as the second harmonic, by using a HOLM-Hertz silencer. By designing the silencer arrangement structure, it increases the low-frequency transmission loss and the low-frequency noise reduction, especially increasing the noise reduction by 15dB at around 200Hz. It also significantly reduces high-frequency noise in the 1000-1200Hz range, thus improving the noise transmission from the indoor unit.

[0104] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A silencer for air conditioning pipes, characterized in that: It includes a Holmhertz silencer (200) and a vibration damping branch (400). The Holmhertz silencer (200) is connected to the main pipeline (300) through the vibration damping branch (400). The vibration damping branch (400) is perpendicularly connected to the main pipeline (300). The vibration damping branch (400) includes a curved section so that the Holmhertz silencer (200) and the main pipeline (300) are arranged in parallel. A bracket (100) is provided in the gap between the Holmhertz silencer (200) and the main pipeline (300). The bracket (100) is connected to the Holmhertz silencer (200) and the main pipeline (300) respectively.

2. The air conditioning duct silencing device as described in claim 1, characterized in that, The diameter of the vibration damping branch (400) is 1 / 6 to 1 / 3 times the diameter of the Holmhertz silencer (200).

3. The air conditioning duct silencing device as described in claim 1, characterized in that, The spacing between the Holmhertz silencer (200) and the main pipeline (300) is 25-35 mm.

4. The air conditioning duct silencing device as described in claim 1, characterized in that, The pipe diameter of the vibration damping branch (400) is greater than or equal to one-quarter of the pipe diameter of the main pipe (300) and less than or equal to half the pipe diameter of the main pipe (300).

5. The air conditioning duct silencing device as described in claim 1, characterized in that, The length-to-diameter ratio of the Holmhertz silencer (200) ranges from 1.2 to 3.

6. The air conditioning duct silencing device as described in claim 1, characterized in that, The diameter of the Holmhertz silencer (200) is 1.2 to 2.5 times the diameter of the main pipeline (300).

7. The air conditioning duct silencing device as described in claim 5, characterized in that, The length-to-diameter ratio of the Holmhertz silencer (200) is 2.

8. The air conditioning duct silencing device as described in claim 6, characterized in that, The diameter of the Holmhertz silencer (200) is 1.5 times the diameter of the main pipeline (300).

9. An air conditioning duct silencing device as described in any one of claims 1-8, characterized in that, The bracket (100) includes an exhaust pipe connection port (101), a resonant cavity muffler connection port (102), and a waistline groove (103). The exhaust pipe connection port (101) is fitted onto the main pipeline (300), and the resonant cavity muffler connection port (102) is fitted onto the Holmhertz muffler (200). The waistline groove (103) is opened on the outside of the bracket (100) to accommodate the fixing cable ties.

10. The air conditioning duct silencing device as described in claim 9, characterized in that, Both the exhaust pipe connection port (101) and the resonant cavity muffler connection port (102) are provided with openings, with an opening angle of 25-40°.

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