A two-stage compressor airflow pulsation attenuation structure and its compressor housing

Abstract

This utility model discloses a two-stage compressor airflow pulsation attenuation structure and its compressor housing. The two-stage compressor housing includes a first-stage intake chamber, a first-stage rotor chamber, a first-stage exhaust chamber, an interstage flow channel, a second-stage intake chamber, a second-stage rotor chamber, and a second-stage exhaust chamber. The compressor housing is also provided with an airflow pulsation attenuation structure, which is as follows: several baffles are provided in the interstage flow channel, and several flow passages are opened on the baffles. The airflow entering the interstage flow channel from the first-stage exhaust chamber passes through the flow passages to form several airflow branches. The airflow pulsation of each airflow branch will cancel each other out, thereby attenuating the airflow pulsation and reducing the aerodynamic noise induced by the airflow pulsation.

Description

Technical Field

[0001] This utility model belongs to the field of compressor technology, specifically relating to a two-stage compressor airflow pulsation attenuation structure and its compressor housing. Background Technology

[0002] A two-stage air compressor combines a single-stage compression rotor and two-stage compression rotors within a single housing, directly driven by helical gears. Residential air passes through an air filter and enters the first stage of compression, where it mixes with a small amount of lubricating oil. This mixture is then compressed to the interstage pressure. The compressed air then enters the second stage, where it is compressed to the final exhaust pressure. During the two-stage compression process, the compression ratio at each stage is relatively low, reducing heat generation and internal leakage, and improving compression efficiency.

[0003] Airflow pulsation is an inherent phenomenon in two-stage air compressors, and if not handled properly, it can lead to a series of serious problems. The design and consideration of the housing play a crucial role in this process.

[0004] Airflow pulsation primarily originates from the periodic intake and exhaust movements of the cylinders, causing periodic fluctuations in gas pressure and flow velocity within the pipeline. In a two-stage compressor, the gas compressed in the primary stage enters the high-pressure stage cylinder for secondary compression. This staged compression structure further exacerbates pressure fluctuations in the pipeline. Airflow pulsation leads to decreased volumetric efficiency, insufficient flow, reduced compressor efficiency, increased energy consumption, and can trigger resonance. Pipelines and accessories are prone to fatigue damage due to vibration, and it can even cause resonance in the compressor body. Summary of the Invention

[0005] The purpose of this invention is to design a two-stage compressor airflow pulsation attenuation structure that can attenuate airflow pulsation and reduce aerodynamic noise induced by airflow pulsation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A two-stage compressor airflow pulsation attenuation structure is disclosed. The two-stage compressor housing includes a first-stage intake chamber, a first-stage rotor chamber, a first-stage exhaust chamber, an interstage flow channel, a second-stage intake chamber, a second-stage rotor chamber, and a second-stage exhaust chamber. The structure is characterized by an airflow pulsation attenuation structure within the compressor housing. The structure comprises: several baffles arranged in the interstage flow channel, forming a flow passage between the baffles; airflow entering the interstage flow channel from the first-stage exhaust chamber passes through the flow passage to form several airflow branches; and the airflow pulsations of each airflow branch cancel each other out, thus attenuating the airflow pulsations.

[0008] Furthermore, the baffle is located below the primary rotor chamber, downstream of the primary exhaust chamber, and upstream of the secondary intake chamber.

[0009] Furthermore, the number of baffles is N, where N≥2, and each baffle has a main flow channel for the main flow path of the airflow.

[0010] Furthermore, the number of flow channels on the baffle plate is 1 to 5, and the cross-sectional shape of the flow channels is at least one of rectangular, circular, elliptical, and arc-shaped.

[0011] Furthermore, the main flow channel area increases sequentially from the baffle plate near the first-stage exhaust chamber to the baffle plate farther away from the exhaust chamber, thereby reducing pressure loss.

[0012] Furthermore, the flow channels on the baffle plate are positioned differently, forming multiple airflow channels with different path differences, which are used to attenuate airflow pulsations of different frequencies.

[0013] A compressor housing, wherein an airflow pulsation attenuation structure is provided inside the compressor housing.

[0014] The above technical solution can achieve the following beneficial effects:

[0015] This invention proposes an airflow pulsation attenuation structure, which divides the airflow from the primary exhaust chamber into the interstage flow channel into multiple branches. Due to the path difference between each flow channel branch, there is a phase difference in the airflow within each flow channel. When the airflow phase within each flow channel is 180°, the airflow pulsation of each airflow branch will cancel each other out, thereby attenuating the airflow pulsation and reducing the aerodynamic noise induced by the airflow pulsation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the compressor casing.

[0017] Figure 2 This is a partial diagram of the compressor casing's airflow pulsation attenuation structure.

[0018] Figure 3 This is a cross-sectional view of the compressor casing.

[0019] In the picture:

[0020] In the diagram: 1. First-stage intake chamber; 2. First-stage rotor chamber; 3. Baffle plate; 4. Second-stage exhaust chamber; 5. Second-stage rotor chamber; 6. Interstage flow channel. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 1-3As shown, a two-stage compressor airflow pulsation attenuation structure is disclosed. The two-stage compressor housing includes a first-stage intake chamber 1, a first-stage rotor chamber 2, a first-stage exhaust chamber, an interstage flow channel 6, a second-stage intake chamber, a second-stage rotor chamber 5, and a second-stage exhaust chamber 4. The characteristic feature is that the compressor housing is further provided with an airflow pulsation attenuation structure, which is as follows: a plurality of baffles 3 are provided in the interstage flow channel, and a flow channel is formed between the baffles. The airflow entering the interstage flow channel from the first-stage exhaust chamber passes through the flow channel to form a plurality of airflow branches. The airflow pulsation of each airflow branch will cancel each other out, thereby attenuating the airflow pulsation.

[0023] Figure 3 As shown in the figure, the shaded area represents a cross-section. In this embodiment, three rows of baffles are provided on both the left and right sides. Figure 3 Starting from the bottom, the system consists of three rows of baffles: the first row, the second row, and the third row. The first row has airflow inlets at its innermost and near-center positions. The second row has airflow inlets at its innermost and near-outermost positions. The third row has an airflow inlet at its innermost position. The airflow inlet near the outermost position of the second row is closer to the outermost position than the airflow inlet at the center of the first row. The baffles on the left and right sides are arranged in a V-shape, parallel to each other, forming a flow channel between them. Therefore, when the airflow from the primary exhaust chamber passes through the first row of baffles, it enters the first flow channel (composed of the first and second rows) through the airflow inlets at the center and innermost positions of the first row. Part of the airflow exits through the innermost flow channel of the second baffle, while the other part enters the second flow channel (composed of the second and third baffles) through the airflow inlet near the outermost position of the second row, and finally enters the compressor through the airflow inlet near the innermost position of the third baffle. As the airflow passes through the first and second flow channels, the baffles create a path difference along the flow path, resulting in a phase difference that cancels out the airflow pulsation, thus attenuating it. The different path differences created by the flow channels on the left and right sides further attenuate airflow pulsations at different frequencies, reducing compressor noise.

[0024] In this embodiment, the spacing between the baffles is 20mm-100mm, and the thickness of the baffles is 5-10mm.

[0025] The baffle is located below the primary rotor chamber, downstream of the primary exhaust chamber, and upstream of the secondary intake chamber.

[0026] The number of baffles is N, where N≥2. Each baffle has a main flow channel for the main flow path of air.

[0027] The number of flow channels on the baffle plate is 1 to 5, and the cross-sectional shape of the flow channels is at least one of rectangular, circular, elliptical, and arc-shaped.

[0028] The area of ​​the main flow channels increases sequentially from the baffle plate closest to the primary exhaust chamber to the baffle plate furthest from the exhaust chamber, thus reducing pressure loss.

[0029] The flow channels on the baffle plates are positioned differently, forming multiple airflow channels with different path differences, which are used to attenuate airflow pulsations of different frequencies.

[0030] Example 1:

[0031] An air compressor housing includes a primary intake chamber, a primary rotor chamber, a primary exhaust chamber, an interstage flow channel, a secondary intake chamber, a secondary rotor chamber, and a secondary exhaust chamber. An airflow pulsation attenuation structure is added within the housing. The structure is as follows:

[0032] Several baffles are installed in the interstage flow channel. The baffles are located below the first stage rotor cavity, downstream of the first stage exhaust cavity and upstream of the second stage intake cavity. Several flow channels are opened on the baffles. The airflow entering the interstage flow channel from the first stage exhaust cavity passes through the flow channels to form several airflow branches. The airflow pulsations of each airflow branch will cancel each other out, thereby attenuating the airflow pulsations.

[0033] Example 2:

[0034] A compressor has a female rotor and a male rotor that mesh with each other inside a housing, forming a closed space between the housing, the female rotor and the male rotor, thereby achieving gas compression and pressurization.

[0035] The above descriptions are all preferred embodiments of this utility model. For those skilled in the art, any modifications to this utility model in various equivalent forms without departing from the principle of this utility model shall fall within the protection scope of the appended claims.

Claims

1. A two-stage compressor airflow pulsation attenuation structure, the two-stage compressor housing comprising a first stage intake cavity, a first stage rotor cavity, a first stage discharge cavity, an inter-stage flow passage, a second stage intake cavity, a second stage rotor cavity, and a second stage discharge cavity, characterized by: The compressor housing is also equipped with an airflow pulsation attenuation structure, which is as follows: several baffles are provided in the interstage flow channel, and a flow channel is formed between the baffles. The airflow entering the interstage flow channel from the first stage exhaust chamber passes through the flow channel to form several airflow branches. The airflow pulsation of each airflow branch will cancel each other out, thereby attenuating the airflow pulsation.

2. The two-stage compressor flow pulsation attenuation structure of claim 1, wherein: The baffle is located below the primary rotor chamber, downstream of the primary exhaust chamber, and upstream of the secondary intake chamber.

3. A two-stage compressor flow pulsation attenuation structure according to claim 1 or 2, characterized in that: The number of baffles is N, where N≥2. Each baffle has a main flow channel for the main flow path of air.

4. The two-stage compressor flow pulsation attenuation structure of claim 3, wherein: The number of flow channels on the baffle plate is 1 to 5, and the cross-sectional shape of the flow channels is at least one of rectangular, circular, elliptical, and arc-shaped.

5. A two-stage compressor flow pulsation attenuation structure according to claim 4, characterized in that: The area of ​​the main flow channels increases sequentially from the baffle plate closest to the primary exhaust chamber to the baffle plate furthest from the exhaust chamber, thus reducing pressure loss.

6. The two-stage compressor flow pulsation attenuation structure of claim 1 or 4, wherein: The flow channels on the baffle plates are positioned differently, forming multiple airflow channels with different path differences, which are used to attenuate airflow pulsations of different frequencies.

7. A compressor housing characterized by: The compressor housing is provided with an airflow pulsation attenuation structure as described in any one of claims 1-6.

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