Two-stage compressor resonant cavity structure and compressor housing thereof

Abstract

This utility model discloses a two-stage compressor resonant cavity 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 key feature is that the compressor housing also includes a resonant cavity structure, which is as follows: a first-stage perforated plate is provided between the interstage flow channel and the first-stage exhaust chamber, and the first-stage perforated plate has several small holes that disperse concentrated fluid into multiple fine streams; a second-stage perforated plate is provided between the interstage flow channel and the second-stage intake chamber, and the second-stage perforated plate has several small holes that form a boundary layer through the edges of the holes; the first-stage perforated plate, the interstage flow channel, and the second-stage perforated plate combine to form a resonant cavity; this reduces the turbulence intensity caused by concentrated fluid kinetic energy, thereby reducing noise generated by eddy shedding and pressure pulsation.

Description

Technical Field

[0001] This utility model belongs to the field of compressor technology, specifically relating to a two-stage compressor resonant cavity 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] Vibration and noise reduction are crucial for two-stage compressors, primarily due to the inherent structural complexity and operational challenges they present, as well as the multifaceted negative impacts of vibration and noise.

[0004] The vibration and noise of a two-stage compressor mainly stem from its structural complexity, making it a stronger generator of vibration and noise. Severe vibration can directly lead to equipment damage, shorten its lifespan, increase maintenance costs and safety risks, while high-intensity noise can harm personnel health and deteriorate the working environment. Summary of the Invention

[0005] The purpose of this invention is to design a two-stage compressor resonant cavity structure and its compressor housing to reduce the turbulence intensity caused by the concentration of fluid kinetic energy, thereby reducing noise caused by eddy shedding and pressure pulsation.

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

[0007] A two-stage compressor resonant cavity structure is disclosed. The two-stage compressor housing includes a first-stage intake cavity, a first-stage rotor cavity, a first-stage exhaust cavity, an interstage flow channel, a second-stage intake cavity, a second-stage rotor cavity, and a second-stage exhaust cavity. The structure is characterized by a resonant cavity structure within the compressor housing, wherein: a first-stage perforated plate is provided between the interstage flow channel and the first-stage exhaust cavity, and the first-stage perforated plate has several small holes that disperse concentrated fluid into multiple fine streams; a second-stage perforated plate is provided between the interstage flow channel and the second-stage intake cavity, and the second-stage perforated plate has several small holes that form a boundary layer through the edges of the holes; the first-stage perforated plate, the interstage flow channel, and the second-stage perforated plate combine to form the resonant cavity.

[0008] Furthermore, the first-stage perforated plate is located downstream of the first-stage exhaust chamber and is used to isolate the first-stage exhaust chamber from the interstage flow channel, so that the gas in the first-stage exhaust chamber must enter the interstage flow channel through the through holes of the first-stage perforated plate.

[0009] Furthermore, the secondary perforated plate is located downstream of the interstage flow channel and is used to isolate the interstage flow channel and the secondary intake chamber, so that the gas in the interstage flow channel must enter the secondary intake chamber through the through holes of the primary perforated plate.

[0010] Furthermore, the structural parameters of the first-stage perforated plate, interstage flow channel, and second-stage perforated plate are determined by the structural and operating parameters of the compressor, and the total area of ​​the through-hole flow channel on the first-stage perforated plate is greater than the total area of ​​the through-hole flow channel on the second-stage perforated plate.

[0011] Furthermore, the cross-sectional shape of the through-hole flow channels on the primary and secondary perforated plates is one or more of the following: circular, rectangular, triangular, elliptical, and arc-shaped. The equivalent diameter range of a single through-hole flow channel is 5mm to 50mm. The concentrated fluid is dispersed into multiple fine streams through multiple through-hole flow channels, reducing the turbulence intensity caused by the concentration of fluid kinetic energy, thereby reducing the noise generated by eddy shedding and pressure pulsation.

[0012] Furthermore, the through-hole channels on the primary and secondary perforated plates are integrally formed by casting.

[0013] A two-stage compressor housing, wherein a resonant cavity structure is provided inside the two-stage compressor housing.

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

[0015] In the structure of this invention, the primary perforated plate disperses the concentrated fluid into multiple fine streams through multiple small holes, reducing the turbulence intensity caused by the concentration of fluid kinetic energy, thereby reducing noise generated by eddy shedding and pressure pulsation. A secondary perforated plate is provided between the interstage flow channel and the secondary air intake chamber. The boundary layer friction formed by the edges of the multiple small holes in the secondary perforated plate consumes the fluid kinetic energy and converts it into heat energy, reducing the transmission of sound wave energy. The primary perforated plate, interstage flow channel, and secondary perforated plate combine to form a resonant cavity, attenuating the low-frequency airflow pulsation of the screw compressor. Attached Figure Description

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

[0017] Figure 2 This is a longitudinal cross-sectional view of the compressor casing.

[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. First-stage exhaust chamber; 4. Interstage flow channel; 5. Second-stage rotor chamber; 6. Second-stage exhaust chamber; 7. First-stage perforated plate; 8. Second-stage perforated plate. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings, in which the shaded area represents a cross-section:

[0022] like Figure 1-3 As shown, a two-stage compressor resonant cavity structure is disclosed. The two-stage compressor housing includes a first-stage intake cavity 1, a first-stage rotor cavity 2, a first-stage exhaust cavity 3, an interstage flow channel 4, a second-stage intake cavity, a second-stage rotor cavity 5, and a second-stage exhaust cavity 6. The characteristic feature is that a resonant cavity structure is further provided within the compressor housing. The structure is as follows: a first-stage perforated plate 7 is provided between the interstage flow channel 4 and the first-stage exhaust cavity. The first-stage perforated plate has several small holes, which disperse the concentrated fluid into multiple fine streams; a second-stage perforated plate 8 is provided between the interstage flow channel and the second-stage intake cavity. The second-stage perforated plate has several small holes, which form a boundary layer through the edges of the holes. The first-stage perforated plate, the interstage flow channel, and the second-stage perforated plate combine to form a resonant cavity.

[0023] The first-stage perforated plate is located downstream of the first-stage exhaust chamber and is used to isolate the first-stage exhaust chamber from the interstage flow channel, so that the gas in the first-stage exhaust chamber must enter the interstage flow channel through the through holes of the first-stage perforated plate.

[0024] The secondary perforated plate is located downstream of the interstage flow channel and is used to isolate the interstage flow channel and the secondary intake chamber, so that the gas in the interstage flow channel must enter the secondary intake chamber through the through holes of the primary perforated plate.

[0025] The structural parameters of the first-stage perforated plate, interstage flow channel, and second-stage perforated plate are determined by the structural and operating parameters of the compressor. The total area of ​​the through-hole flow channel on the first-stage perforated plate is greater than the total area of ​​the through-hole flow channel on the second-stage perforated plate.

[0026] The cross-sectional shape of the through-hole flow channels on the primary and secondary perforated plates is one or more of the following: circular, rectangular, triangular, elliptical, and arc-shaped. The equivalent diameter range of a single through-hole flow channel is 5mm to 50mm. The concentrated fluid is dispersed into multiple fine streams through multiple through-hole flow channels, reducing the turbulence intensity caused by the concentration of fluid kinetic energy, thereby reducing the noise generated by eddy shedding and pressure pulsation.

[0027] The through-hole channels on the primary and secondary perforated plates are integrally formed by casting. Example 1

[0028] The two-stage 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. Air is drawn in from the primary intake chamber, compressed and pressurized in the rotor chamber, and then discharged into the primary exhaust chamber. Air in the primary exhaust chamber flows through the interstage flow channel into the secondary intake chamber, is compressed and pressurized in the secondary rotor chamber, and then discharged into the secondary exhaust chamber, thus achieving the gas pressurization process. A primary perforated plate is provided between the interstage flow channel and the primary exhaust chamber. This perforated plate disperses the concentrated fluid into multiple fine streams through multiple small holes, reducing the turbulence intensity caused by concentrated fluid kinetic energy, thereby reducing noise generated by eddy current shedding and pressure pulsation. A secondary perforated plate is provided between the interstage flow channel and the secondary intake chamber. The boundary layer friction formed by the edges of the multiple small holes in the secondary perforated plate consumes fluid kinetic energy, converting it into heat energy and reducing sound wave energy transfer. The primary perforated plate, interstage flow channel, and secondary perforated plate combine to form a resonant cavity, attenuating low-frequency airflow pulsation in the screw compressor.

[0029] Based on the above embodiments:

[0030] 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.

[0031] 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 resonant cavity 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 also has a resonant cavity structure, which is as follows: a primary perforated plate is provided between the interstage flow channel and the primary exhaust cavity. The primary perforated plate has several small holes, which disperse the concentrated fluid into multiple fine streams; a secondary perforated plate is provided between the interstage flow channel and the secondary intake cavity. The secondary perforated plate has several small holes, which form a boundary layer through the edges of the holes. The primary perforated plate, the interstage flow channel and the secondary perforated plate are combined to form a resonant cavity.

2. A two-stage compressor resonant cavity structure as claimed in claim 1, characterized in that: The first-stage perforated plate is located downstream of the first-stage exhaust chamber and is used to isolate the first-stage exhaust chamber from the interstage flow channel, so that the gas in the first-stage exhaust chamber must enter the interstage flow channel through the through holes of the first-stage perforated plate.

3. A two-stage compressor resonant cavity structure as claimed in claim 1, wherein: The secondary perforated plate is located downstream of the interstage flow channel and is used to isolate the interstage flow channel and the secondary intake chamber, so that the gas in the interstage flow channel must enter the secondary intake chamber through the through holes of the primary perforated plate.

4. A two-stage compressor resonant cavity structure according to claim 1 or 2 or 3, characterized in that: The structural parameters of the first-stage perforated plate, interstage flow channel, and second-stage perforated plate are determined by the structural and operating parameters of the compressor. The total area of ​​the through-hole flow channel on the first-stage perforated plate is greater than the total area of ​​the through-hole flow channel on the second-stage perforated plate.

5. A two-stage compressor resonant cavity structure as claimed in claim 4, characterized in that: The cross-sectional shape of the through-hole flow channels on the primary and secondary perforated plates is one or more of the following: circular, rectangular, triangular, elliptical, and arc-shaped. The equivalent diameter range of a single through-hole flow channel is 5mm to 50mm. The concentrated fluid is dispersed into multiple fine streams through multiple through-hole flow channels, reducing the turbulence intensity caused by the concentration of fluid kinetic energy, thereby reducing the noise generated by eddy shedding and pressure pulsation.

6. A two-stage compressor resonant cavity structure as claimed in claim 5, characterized in that: The through-hole channels on the primary and secondary perforated plates are integrally formed by casting.

7. A two-stage compressor housing characterized by: The two-stage compressor housing is provided with the resonant cavity structure as described in any one of claims 1-6.

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