A concave gradually expanding intake port profiled silencing cavity for micro-compressor

Abstract

The utility model discloses a kind of for the inner concave gradually expanding type air inlet profiled sound-absorbing cavity of micro-compressor, comprising: upper cavity shell, middle baffle, communicating pipe and lower cavity shell;Upper cavity shell is bottom opening structure, lower cavity shell is top opening structure, upper cavity shell is connected with lower cavity shell clamping, middle baffle is transversely arranged between upper cavity shell and lower cavity shell, the center is provided with through-hole, the top end of communicating pipe is inserted into through-hole and extend into upper cavity shell, other end is connected with the air inlet of lower cavity shell, air inlet is inner concave gradually expanding type air inlet.The profiled sound-absorbing cavity for the inner concave gradually expanding type air inlet of micro-compressor, by adopting the profiled structure and inner concave gradually expanding type air inlet structure design of topological adaptation with compressor lower shell contour, and by axial centering design and compressor lower shell suction port accurate matching, the effective volume maximization of micro-compressor sound-absorbing cavity is realized, significantly reduce operating noise and mechanical collision risk, effectively inhibit the oil droplet carrying and secondary atomization carrying amount caused by airflow separation.

Description

Technical Field

[0001] This utility model relates to the field of compressor installation technology, and in particular to a concave, gradually expanding inlet contoured silencer cavity for a micro compressor. Background Technology

[0002] The intake silencer chamber is a key component installed near the intake port of the compressor's lower casing. Its main purpose is to reduce the noise generated by the compressor during the intake process and improve the smoothness of airflow.

[0003] In micro compressors, due to limited housing space, the topology of the silencing cavity is not fully matched to the internal spatial characteristics of the housing, resulting in low volume utilization and limited internal cavity design. Acoustic resonance occurs, especially at high frequencies (>1kHz), and the cavity is not effectively filled. The silencing cavity inlet is located on the side of the cavity, creating an irregular shape that leads to insufficient installation clearance. After expansion, interference with adjacent components is likely, increasing the risk of impact with the housing. The airflow velocity gradient at the inlet cannot be effectively controlled at the inlet, or oil droplets cannot flow back out of the cavity, increasing the oil droplet carryover coefficient. The large distance between the inlet and the compressor lower housing inlet hole causes a lack of local pressure gradient, creating a backflow dead zone within the cavity and accelerating secondary oil atomization and carryover.

[0004] In summary, it is necessary to design a concave, gradually expanding intake contour-following silencer cavity for micro compressors to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is that, in the case of existing silencers, the air inlet installation gap is too small, the airflow velocity gradient at the inlet cannot be effectively controlled at the inlet, or the oil droplets cannot flow back out of the cavity, which increases the oil droplet carrying coefficient. The distance between the air inlet and the air inlet hole of the compressor lower shell is large, resulting in the loss of local pressure gradient and the formation of a backflow dead zone in the cavity, which accelerates the secondary atomization and carrying of oil. Therefore, a concave and gradually expanding air inlet contour silencer for micro compressors is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides a concave-expanding air inlet contoured silencer for a micro compressor, comprising: an upper cavity shell, a middle partition, a connecting pipe, and a lower cavity shell; the upper cavity shell has a bottom-opening structure, and the lower cavity shell has a top-opening structure, the upper cavity shell and the lower cavity shell are snap-fitted together, the middle partition is horizontally arranged between the upper cavity shell and the lower cavity shell, and a through hole is opened in its center, the top end of the connecting pipe is inserted into the through hole and extends into the upper cavity shell, and the other end is connected to the air inlet of the lower cavity shell, the air inlet is a concave-expanding air inlet, and a through opening is opened on a section of the pipe wall located inside the lower cavity shell.

[0007] In a preferred embodiment of this solution, the top opening edge of the lower cavity shell is provided with a lower boss that is higher on the inside and lower on the outside, and the bottom opening edge of the upper cavity shell is provided with an upper boss that is lower on the inside and higher on the outside. The lower cavity shell is engaged with the upper boss of the upper cavity shell through the lower boss.

[0008] Furthermore, the partition plate is snapped into the bottom opening of the upper cavity shell.

[0009] In a preferred embodiment of this solution, the external shape of the contour-following silencing cavity is a contour-following shape that is topologically adapted to the lower shell profile of the micro compressor.

[0010] Implementing this utility model has the following beneficial effects:

[0011] The concave-expanding intake silencing cavity for micro compressors utilizes a contoured structure that adapts to the topology of the compressor's lower casing and a concave-expanding intake structure design. Through axial alignment, it precisely matches the intake port of the compressor's lower casing, maximizing the effective volume of the micro compressor's silencing cavity. This significantly reduces operating noise and the risk of mechanical collisions in a compact layout, and effectively suppresses oil droplet carryover and secondary atomization caused by airflow separation. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 An exploded structural diagram of the concave, gradually expanding air inlet contour-following silencer cavity for a micro compressor provided by this utility model.

[0014] Figure 2 This is a schematic diagram of the lower cavity shell;

[0015] In the diagram: upper shell 1, middle partition 2, connecting pipe 3, lower shell 4, upper boss 5, lower boss 6, through hole 7, air inlet 8, and outlet 9. Detailed Implementation

[0016] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1 , Figure 1 This is an exploded structural diagram of the concave, gradually expanding, contoured silencing cavity for a micro compressor provided by this utility model; the concave, gradually expanding, contoured silencing cavity for a micro compressor includes: an upper cavity shell 1, a middle partition 2, a connecting pipe 3, and a lower cavity shell 4.

[0018] The upper cavity shell 1 has a bottom opening structure, and a raised upper boss 5 with a lower inner edge and a higher outer edge is provided along the edge of the bottom opening. The lower cavity shell 4 has a top opening structure, and a raised lower boss 6 with a lower outer edge is provided along the edge of the top opening. The lower cavity shell 4 is engaged with the upper boss 5 of the upper cavity shell 1 through the lower boss 5.

[0019] The partition plate 2 is horizontally positioned between the upper cavity shell 1 and the lower cavity shell 4, and is snapped into the bottom opening of the upper cavity shell 1. A through hole 7 is formed in the center of the partition plate 2. The top end of the connecting pipe 3 is inserted into the through hole 7 and extends into the upper cavity shell 1, while the other end connects to the air inlet 8 of the lower cavity shell 4. The air inlet 8 is a concave-expanding type, meaning that the air inlet 8 is recessed inwards on the lower cavity shell 4, and its diameter gradually increases from the outside to the inside. Please refer to [link to relevant documentation]. Figure 2 , Figure 2 This is a schematic diagram of the lower cavity shell. The connecting pipe 3 has an opening 9 on a section of its wall inside the lower cavity shell 4 for communicating with the interior of the lower cavity shell 4.

[0020] This contoured muffler utilizes the internal space of the micro compressor's lower casing by avoiding multiple components (such as the housing, cylinder base, motor, stator screw bracket, cylinder head, and valve assembly). The equidistant housing shape allows the intake muffler to be topologically adapted to the micro compressor's lower casing, maximizing its volume. Based on the Helmholtz resonance principle, the muffler's internal volume is distributed through connecting pipes and baffles, creating a multi-cavity combination that expands the frequency band and forms a highly efficient muffler structure. A concave, gradually expanding air inlet structure is designed on the contoured surface and precisely matched to the compressor's lower casing intake port through axial alignment. This maximizes the effective volume of the micro compressor's muffler, significantly reducing operating noise and the risk of mechanical collisions in a compact layout, and effectively suppressing oil droplet carryover and secondary atomization caused by airflow separation.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A concave, gradually expanding inlet contour-following silencer cavity for a micro compressor, characterized in that, include: The system comprises an upper cavity shell, a middle partition, a connecting pipe, and a lower cavity shell. The upper cavity shell has a bottom-opening structure, and the lower cavity shell has a top-opening structure. The upper cavity shell and the lower cavity shell are snap-fitted together. The middle partition is horizontally disposed between the upper cavity shell and the lower cavity shell, and has a through hole in its center. The top end of the connecting pipe is inserted into the through hole and extends into the upper cavity shell, while the other end is connected to the air inlet of the lower cavity shell. The air inlet is a concave, gradually expanding air inlet. A through opening is formed on a section of the connecting pipe wall located inside the lower cavity shell.

2. The concave, gradually expanding inlet contour-following silencer cavity for a micro compressor according to claim 1, characterized in that, The lower cavity shell has a lower boss with a higher inner edge and a lower outer edge at the top opening edge, and the upper cavity shell has an upper boss with a lower inner edge and a higher outer edge at the bottom opening edge. The lower cavity shell is engaged with the upper boss of the upper cavity shell through the lower boss.

3. The concave, gradually expanding inlet contour-following silencer cavity for a micro compressor according to claim 2, characterized in that, The middle partition is snapped into the bottom opening of the upper cavity shell.

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