Silencing device and compressor

Abstract

The invention relates to a silencing device and a compressor, is used for suppressing airflow noise of the compressor, and belongs to the technical field of compressors. A through hole is formed in the middle of the device body; a through hole is formed in the device body, at least a first silencing cavity and a second silencing cavity are formed in the device body, the center line of the first silencing cavity passes through the center of the through hole, and the second silencing cavity is formed in the side edge of the through hole and communicated with the first silencing cavity. According to the silencing device provided by the invention, through combination of the silencing cavities with different volumes and structures, the expansion cavity silencing principle in acoustics and the reflection and interference effects of sound waves during propagation in pipelines with different sectional areas are utilized, so that part of sound energy is counteracted due to opposite phases, noise is reduced, high-frequency airflow noise in the compressor can be effectively suppressed, and the service life of the compressor is prolonged. And the noise reduction device is especially suitable for noise reduction at the frequency band of 1800-4000 Hz.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a muffler and a compressor. Background Art

[0002] A silencer is a device that allows air to pass through while effectively preventing or reducing the outward propagation of sound energy. Its direct effect is to reduce noise.

[0003] Compressor is the core noise source of refrigeration equipment. Compressor noise includes airflow noise, mechanical noise and motor noise. Airflow noise is mainly concentrated in the medium and high frequency bands. Currently, there are technical bottlenecks in the noise reduction of compressors in the medium and high frequency bands, making it difficult to meet the noise reduction standards. Existing silencers are also unable to achieve effective noise reduction in this frequency band. Figure 4 .

[0004] Mid- and high-frequency noise accounts for a significant portion of the overall compressor noise and contributes significantly to the total noise value (OA value). Reducing its amplitude can significantly reduce the overall noise level of the equipment. Therefore, there is an urgent need for a silencer that can effectively reduce noise in the mid- and high-frequency ranges. Summary of the Invention

[0005] In view of the defect that the existing silencer of a compressor cannot effectively reduce noise in the medium and high frequency bands, the present invention provides a silencer and a compressor.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] One of the objects of the present invention is a muffler device for suppressing airflow noise of a compressor, comprising a device body;

[0008] A through hole is provided in the middle of the device body;

[0009] The device body is provided with at least a first silencing chamber and a second silencing chamber, wherein the center line of the first silencing chamber passes through the center of the through hole, and the second silencing chamber is provided on the side of the through hole and communicates with the first silencing chamber.

[0010] Furthermore, the volume of the first silencing chamber is recorded as V1, the volume of the second silencing chamber is recorded as V2, and V1≠V2.

[0011] Furthermore, the chamber height of the first silencing chamber is recorded as H1, and the chamber height of the second silencing chamber is recorded as H2, and H1≠H2.

[0012] Furthermore, the angle between the center lines of two adjacent silencing chambers is denoted as Q, and 35°≤Q≤115°.

[0013] Furthermore, except for the first silencing chamber, the remaining silencing chambers are all provided with air outlets.

[0014] Furthermore, the inner diameter of the air outlet gradually decreases from the inside to the outside, and the gradual change first increases and then decreases.

[0015] Furthermore, a third silencing chamber is provided on the device body, the third silencing chamber is communicated with the first silencing chamber, and the third silencing chamber and the second silencing chamber are symmetrically distributed on both sides of the through hole.

[0016] Furthermore, a fourth silencer chamber and a fifth silencer chamber are provided on the device body, the fourth silencer chamber is connected to the second silencer chamber, the fifth silencer chamber is connected to the third silencer chamber, and the fourth silencer chamber and the fifth silencer chamber are symmetrically distributed on both sides of the through hole.

[0017] Furthermore, the first muffler chamber faces the exhaust port of the compressor.

[0018] A second object of the present invention is a compressor comprising the silencer as described above.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The silencer provided by the present invention combines silencer chambers of different volumes and structures, and utilizes the expansion cavity silencer principle in acoustics. The reflection and interference effects of sound waves when propagating in pipes of different cross-sectional areas cancel out part of the sound energy due to opposite phases, thereby reducing noise. The device can effectively suppress the high-frequency airflow noise in the compressor, and is particularly suitable for noise reduction in the 1800-4000Hz frequency band.

[0021] (2) The compressor provided by the present invention includes the above-mentioned silencer, and the compressor can significantly reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the muffler device of the present invention;

[0023] Figure 2 A top view of the muffler of the present invention;

[0024] Figure 3 is a side view of the muffler of the present invention;

[0025] Figure 4 is a schematic diagram of an existing silencer;

[0026] Figure 5 The simulation noise reduction evaluation results of the noise reduction device provided by the present invention and the existing noise reduction device;

[0027] Figure 6 A comparison chart of the noise reduction effects of the noise reduction device provided by the present invention and the existing noise reduction device;

[0028] The numbers in the figure are as follows: 1-device body; 2-through hole; 3-first silencer chamber; 4-second silencer chamber; 5-air outlet; 6-third silencer chamber; 7-fourth silencer chamber; 8-fifth silencer chamber. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example 1

[0031] The existing compressor silencers mostly adopt a simple structure of a single expansion chamber, which has limited noise reduction in the mid- and high-frequency bands. In order to solve the defect that the existing compressor silencers cannot effectively reduce noise in the mid- and high-frequency bands, this embodiment provides a silencer that can effectively reduce the noise in the mid- and high-frequency bands of the compressor. The lower end surface of the silencer is mounted in conjunction with the upper end surface of the compressor cylinder head. For the specific structure, see Figure 1-3 The silencer device includes a device body 1 with a through hole 2 in the middle, and a first silencer chamber 3, a second silencer chamber 4, a third silencer chamber 6, a fourth silencer chamber 7, and a fifth silencer chamber 8 arranged on the device body 1.

[0032] Please see again Figure 1 In this embodiment, the centerline of the first silencing chamber 3 passes through the center of the through-hole 2, and the first silencing chamber 3 directly faces the exhaust port of the compressor. Specifically, the first silencing chamber 3 directly faces the exhaust port of the compressor, directly receiving unattenuated high-frequency airflow pulses and serving as the primary aerodynamic source. The airflow pulses are at their largest here. The first silencing chamber 3 serves as the primary acoustic reflection and interference area, providing preliminary reflection and attenuation of mid- and high-frequency sound waves.

[0033] Please see again Figure 1In this embodiment, taking the first silencer chamber 3 as the starting point, the second silencer chamber 4 and the fourth silencer chamber 7 are arranged in sequence from near to outside on one side of the device body 1, and the third silencer chamber 6 and the fifth silencer chamber 8 are arranged in sequence from near to outside on the other side of the device body 1. Furthermore, the third silencer chamber 6 and the second silencer chamber 4 are symmetrically distributed on both sides of the through hole, and the fourth silencer chamber 7 and the fifth silencer chamber 8 are symmetrically distributed on both sides of the through hole; the second silencer chamber 4 and the third silencer chamber 6 are respectively connected to the first silencer chamber 3, the fourth silencer chamber 7 is connected to the second silencer chamber 4, and the fifth silencer chamber 8 is connected to the third silencer chamber 6. This embodiment can guide the airflow to diffuse evenly through the symmetrical distribution and multi-level connection structure between the silencer chambers, thereby increasing the reflection path and interference opportunities of the sound waves in the chamber. Specifically, the structural design of the remaining silencing chambers, symmetrically distributed on either side of the first silencing chamber 3, balances airflow pressure, reduces flow losses, and simultaneously reflects mid- and high-frequency sound waves at multiple angles, enhancing the noise reduction effect. The multi-stage interconnected structure between the multiple silencing chambers on one side of the first silencing chamber 3 guides the gradual diffusion of airflow, preventing strong noise radiation from a single channel and reducing airflow backpressure, ensuring that compressor performance is not significantly affected.

[0034] In this embodiment, the angle between the centerlines of two adjacent muffler chambers is denoted as Q, and ranges from 35° ≤ Q ≤ 115° to avoid excessive concentration or dispersion of the chambers. Within this ratio range, the muffler achieves excellent muffler effectiveness in mid- and high-frequency bands, while minimizing the impact on compressor performance. Optionally, within this Q value range, the muffler chambers in this embodiment can be configured to have two, three, four, five, or six chambers, among others.

[0035] In this embodiment, except for the first muffler chamber 3, the other muffler chambers are all provided with an air outlet 5. The shape of the air outlet 5 is characterized in that the longitudinal section is a bell-mouth shape, a circular arc shape, a parabola shape, a venturi shape or other smooth transition shape.

[0036] Please see again Figure 3 In this embodiment, the inner diameter of the air outlet 5 gradually decreases from the inside to the outside, and the gradual change first increases and then decreases. The flow rate of the gas will also become faster when passing through. The temperature of the gas decreases as the aperture decreases, so the temperature of the outlet will also decrease. The decrease in the outlet temperature directly affects the heat exchange and can improve the performance of the compressor.

[0037] In this embodiment, the second silencer chamber 4 and the third silencer chamber 6 are silencer chambers with mirror-symmetrical structures, and their volumes and chamber heights are consistent; the fourth silencer chamber 7 and the fifth silencer chamber 8 are silencer chambers with mirror-symmetrical structures, and their volumes and chamber heights are consistent; the volume of the first silencer chamber 3 is recorded as V1, the volume of the second silencer chamber 4 is recorded as V2, and the volume of the fourth silencer chamber 7 is recorded as V3, V1≠V2≠V3; the chamber height of the first silencer chamber 3 is recorded as H1, the chamber height of the second silencer chamber 4 is recorded as H2, and the volume of the fourth silencer chamber 7 is recorded as H3, H1≠H2≠H3.

[0038] Preferably, in this embodiment, V1>V2>V3, H1>H2>H3. By designing as above, the airflow is guided to be discharged evenly, and the flow loss is reduced. Specifically, the energy of the airflow is relatively maximum when it is just ejected, and will be relatively weakened afterwards. The large size of the ejection cavity can reduce the initial large pulsation. In addition, different volumes can correspond to different resonant frequencies. The sound elimination effect of the expansion cavity is related to the wavelength of the sound wave (λ) and the cavity size (such as cavity height and volume). Different volumes and cavity heights can more effectively match their wavelengths, so that the sound waves form standing waves of an integer multiple of half the wavelength in the cavity, thereby enhancing destructive interference.

[0039] Figure 5 The simulation results of the noise reduction evaluation of the noise reduction device of this embodiment and the existing noise reduction device are shown in the figure. The horizontal axis represents the noise frequency band and the vertical axis represents the noise reduction amount. According to the actual data, it can be seen that the noise reduction device of this embodiment has a better effect on the noise reduction of the existing noise reduction device. medium to high The noise reduction effect of sound waves in the frequency band is significantly improved.

[0040] Figure 6 This is a comparison of the noise reduction effect of the noise reduction device of this embodiment and the existing noise reduction device, that is, the comparison of the effect of the noise reduction device of this embodiment and the existing noise reduction device in formal installation verification. In the figure, the horizontal axis represents the noise frequency band, and the vertical axis represents the noise level of the compressor. According to the actual data, it can be seen that the noise reduction device of this embodiment has a better effect on the compressor. medium to high The noise reduction effect of sound waves in the frequency band is significantly improved.

[0041] Example 2

[0042] This embodiment provides a silencer device that is basically the same as that of the first embodiment, except that only a first silencer chamber 3 and a second silencer chamber 4 are provided on the device body 1 in this embodiment.

[0043] Example 3

[0044] This embodiment provides a silencer device that is basically the same as that of Embodiment 1, except that the device body 1 in this embodiment only has a first silencer chamber 3 , a second silencer chamber 4 and a third silencer chamber 6 .

[0045] Example 4

[0046] This embodiment provides a compressor, which includes the silencer as described in Example 1.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A muffler, which is mounted on the upper cylinder head of a compressor and is used to suppress the airflow noise of the compressor, characterized in that: It includes a device body (1); A through hole (2) is provided in the middle of the device body (1); The device body (1) is provided with at least a first silencing chamber (3) and a second silencing chamber (4), wherein the center line of the first silencing chamber (3) passes through the center of the through hole (2), and the second silencing chamber (4) is provided on the side of the through hole and communicates with the first silencing chamber (3).

2. A muffler device according to claim 1, characterized in that: The volume of the first silencing chamber (3) is recorded as V1, and the volume of the second silencing chamber (4) is recorded as V2, and V1≠V2.

3. A muffler device according to claim 1, characterized in that: The chamber height of the first silencing chamber (3) is recorded as H1, and the chamber height of the second silencing chamber (4) is recorded as H2, where H1≠H2.

4. A muffler device according to claim 1, characterized in that: The angle between the center lines of two adjacent muffler chambers is denoted as Q, and 35°≤Q≤115°.

5. A muffler device according to claim 1, characterized in that: Except for the first silencing chamber (3), the remaining silencing chambers are all provided with air outlet holes (5).

6. A muffler device according to claim 5, characterized in that: The inner diameter of the air outlet hole (5) gradually decreases from the inside to the outside, and the gradual change first increases and then decreases.

7. A muffler device according to claim 1, characterized in that: The device body (1) is further provided with a third silencing chamber (6), the third silencing chamber (6) being connected to the first silencing chamber (3), and the third silencing chamber and the second silencing chamber (4) being symmetrically distributed on both sides of the through hole.

8. A muffler device according to claim 7, characterized in that: The device body (1) is further provided with a fourth silencing chamber (7) and a fifth silencing chamber (8); the fourth silencing chamber (7) is connected to the second silencing chamber (4); the fifth silencing chamber (8) is connected to the third silencing chamber (6); and the fourth silencing chamber (7) and the fifth silencing chamber (8) are symmetrically distributed on both sides of the through hole.

9. A muffler device according to claim 1, characterized in that: The first muffler chamber (3) faces the exhaust port of the compressor.

10. A compressor, characterized in that: The utility model comprises a noise reduction device as described in any one of claims 1 to 9.

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