Noise Reduction Techniques in HVAC Compressors

A noise reduction refrigeration system for household appliances that achieves a lower noise level than conventional low-temperature systems. The system employs a unique configuration where the high-pressure side of the low-temperature refrigeration cycle loop operates within a narrower pressure range compared to conventional systems. This configuration enables the low-pressure side of the refrigeration cycle loop to operate within a broader pressure range, allowing the low-pressure compressor to achieve a lower suction pressure and exhaust pressure. The system achieves this by configuring the high-pressure side to operate at a lower absolute pressure range (2-11 bar) and the low-pressure side to operate at a higher absolute pressure range (0.2-1.1 bar), thereby reducing the overall system pressure drop and resulting noise.

Source

A heat pump compressor noise reduction device for household air source heat pumps that effectively reduces compressor noise while maintaining system performance. The device comprises a compressor body, a vibration-damping pad fixed to the bottom of the compressor body, a top cover that covers the compressor body, and a surrounding plate that encloses the compressor body between the top cover and the bottom plate. This design provides optimal damping of the compressor's vibration through the vibration-damping pad, while the top cover and surrounding plate work together to provide effective noise reduction around the compressor.

Source

A compressor design to reduce compressor noise in air conditioning systems. The design incorporates a unique muffler configuration that optimizes airflow management through the exhaust port. By strategically positioning the muffler's mounting structure, the system achieves a specific axial depth ratio (H) that balances airflow velocity and pressure drop. This configuration enables the compressor to operate within a narrower range of axial depths, thereby reducing the noise generated by the exhaust port. The design ensures structural integrity while maintaining optimal airflow characteristics, resulting in a quieter compressor operation.

Source

Noise reduction device for heat pump air conditioners that utilizes a novel sound-absorbing mechanism integrated into the compressor housing. The device comprises a compressor, a sound-absorbing mechanism connected to the output end of the compressor through a pipeline, and a sound-absorbing cavity with multiple sound-absorbing channels. The sound-absorbing mechanism is arranged in a sealed, end-to-end configuration within the cavity, with both ends connected to the end cover. The input and output pipes are arranged away from the cover, communicating with the cavity through separate channels. This configuration enables effective sound absorption while maintaining the compressor's operational integrity.

Source

A compression refrigeration system and refrigeration device that eliminates compressor noise through a novel muffler design. The system incorporates a muffler with a specially configured chamber between the compressor and condenser, where exhaust and intake pipes are inserted. This chamber creates a buffer zone that significantly reduces the compressor-pulsation noise and vibration. The system also incorporates a comprehensive cleaning system to prevent impurities from entering the system.

Source

A heat pump unit with integrated noise reduction system that achieves both efficient heating and cooling while minimizing noise. The unit features a sound-absorbing plate integrated into the finned heat exchanger design, which optimally positions airflow paths for optimal sound absorption. The plate is strategically positioned to maximize sound absorption while maintaining airflow efficiency. An electric control box is positioned in front of the compressor to block noise propagation. The system is integrated into the unit's design, eliminating the need for separate noise-reducing barriers or enclosures.

Source

A noise reduction device for air conditioners that effectively absorbs low-frequency and intermediate-frequency noise. The device comprises a muffler frame with a perforated plate that encloses the muffler cavity. A sound-absorbing layer is attached to the perforated plate, filling the cavity. The perforated plate has through holes that allow the noise to pass through, while the sound-absorbing layer absorbs the noise. The sound-absorbing layer fills the cavity, with the perforated plate providing the initial path for noise entry.

Source

Compressor assembly and air conditioner with reduced noise and vibration by using resonant sound absorption structures around the compressor. The compressor body has a cover with resonance structures inside that fall between the cover and compressor body. The structures have shapes like helmholtz resonators. The resonant frequencies of the structures in each group match compressor frequency bands. This converts vibration energy to heat through friction. The structures absorb compressor noise by resonance. It provides effective noise/vibration reduction compared to traditional damping.

Source

A compressor and air conditioning system that reduces compressor noise through advanced liquid separator design. The system employs a unique liquid separator configuration that eliminates the traditional liquid separator's high-frequency resonant peaks while maintaining optimal low-frequency performance. The separator's design incorporates a specially engineered separator wall that effectively suppresses the 1500 Hz resonant frequency, while maintaining the separator's high flow rates and pressure characteristics. This innovative design approach enables the compressor to operate at high speeds while significantly reducing noise levels, particularly at frequencies above 1500 Hz.

Source

A low-noise compressor that reduces vibration and noise generated during gas transportation through a novel combination of sound-absorbing and damping materials integrated into the compressor casing. The compressor comprises a casing, a compression mechanism arranged in the casing, and a compression drive mechanism for driving the compression mechanism to work. The compression mechanism includes a first compression structure and a second compression structure, where the first compression structure is located on one side of the casing, the second compression structure is located on the other side of the casing, the casing is in contact with the first compression structure and the second compression structure, compression chambers are provided at corresponding positions of, wherein there are two compression chambers, a first compression chamber and a second compression chamber respectively, the first compression structure is provided in the first compression chamber, the second compression chamber is arranged in the second compression chamber, the air outlet of the first compression chamber communicates with the air inlet of the second compression chamber through a connecting pipe, the connecting pipe is provided with a sound-absorbing and shock-absorbing material made of sound-absorbing material.

Source

Electrochemical device that reduces airborne noise in air shafts of the heat pump. The device includes a refrigerant circuit, a interference silencer, and a pipeline.

Source

A compressor vibration and noise reduction structure that significantly reduces vibration transmission and noise generation in air conditioner compressors. The structure includes a noise reduction shell around the compressor, flexible vibration damping rings between the shell and compressor, outlet and intake pipe damping parts, and vibration reduction seats. The damping rings, seats, and parts isolate and absorb vibrations between the compressor and shell, pipes, and housing. The intake pipe damping part connects the pipes and seals to prevent air leakage. The shell and compressor vibration damping reduces transmission to the shell and housing. This simple, low-cost structure significantly reduces compressor vibration and noise compared to improving accuracy and balance.

Source

A noise-reducing enclosure for HVAC systems that minimizes compressor noise transmission through the housing. The enclosure encloses the compressor within a rigid metal shell, with an outer insulating structure that includes a rigid plastic sheet and a foam layer. The enclosure is designed to provide structural mass to absorb compressor vibrations, while maintaining a tight seal to prevent air leaks. The enclosure is mounted to the housing first end, creating a hermetically sealed structure that significantly reduces compressor noise transmission through the duct system.

Source

A compressor assembly and refrigeration system that reduces compressor noise by incorporating a wavelength tube muffler. The muffler is strategically positioned to intercept and dissipate the high-frequency pressure wave generated during compressor operation, thereby significantly reducing the sound intensity transmitted to the outside environment. The muffler is integrated into both the compressor and the accumulator, with its chamber communicating through a circulation port. This design enables the muffler to effectively suppress the high-frequency noise characteristic of compressor operation.

Source

A compressor assembly and refrigeration system design that reduces compressor noise through a novel resonance chamber muffler configuration. The design incorporates a muffler that houses a resonant chamber with a unique cavity configuration where the cross-sectional area of the chamber's end is larger than the adjacent cavity's end. This design creates a resonant cavity that amplifies and dissipates sound energy, effectively reducing compressor noise levels. The muffler is strategically positioned outside the compressor's inner cavity, allowing direct sound entry from the compressor's exhaust port. This design enables the muffler to capture and dissipate sound energy while maintaining optimal airflow and pressure conditions.

Source

A noise-reducing silencer for compressors that integrates directly into the compressor's air inlet while maintaining operational efficiency. The silencer comprises a housing, a silencer core comprising two spiral chambers stacked on each other, and sound-absorbing material within the spiral chambers. The core design enables effective noise reduction without compromising airflow or compressor performance. The silencer can be integrated into the compressor's air filter or attached as a separate element to achieve optimal noise reduction while minimizing installation complexity.

Source

A low-noise heat pump system that minimizes noise generation through optimized compressor placement and system design. The system employs a novel compressor mounting configuration where the compressor is integrated into the heat pump unit casing, rather than being mounted on the chassis. This eliminates the direct motor-axial interaction with the chassis and eliminates the resonant pipe connections, significantly reducing noise levels. The system also features a specially designed fan configuration that reduces fan noise through optimized airflow paths. The integrated compressor and fan design provides a low-noise operation characteristic, making it suitable for residential applications where noise sensitivity is a concern.

Source

A scroll compressor for heat pump systems that achieves superior noise reduction through a novel silencing assembly. The compressor incorporates a sound-absorbing material in its exhaust port, with an additional elastic member positioned between the exhaust port and the scroll. This dual-path silencing approach effectively absorbs both the high-frequency noise generated by the compressor discharge and the lower-frequency noise radiated through the exhaust port. The elastic member absorbs the gas discharge noise, while the sound-absorbing material in the exhaust port absorbs the port noise. The system's design enables both port and exhaust noise reduction, significantly improving overall system noise performance compared to conventional muffler-based solutions.

Source

Cryogenic refrigeration condensing unit with anti-noise device that addresses the challenge of meeting both indoor and outdoor noise standards for commercial refrigeration equipment. The device integrates a low-temperature refrigeration compressor, condenser fan, and vapor-liquid separator into a single unit. The compressor outlet is connected to a condenser, while the condenser outlet connects to a reservoir. The reservoir inlet is connected to a vapor-liquid separator, which then connects to a cold-air pipe. An anti-noise device comprises a cover with integrated sound-absorbing material and ventilation channels that direct noise away from the compressor. This innovative design enables the condensing unit to achieve both indoor noise standards (60 dB) and outdoor noise requirements (61-73 dB) while minimizing noise transmission through the condenser fan and compressor.

Source

A scroll compressor for air conditioning systems that reduces exhaust noise through a novel sound-absorbing design. The compressor features a fixed scroll with a strategically positioned exhaust port, followed by a sound-absorbing component above the exhaust port. The sound-absorbing material is strategically positioned to effectively absorb the high-frequency noise generated by gas discharge from the exhaust port. This innovative design addresses the conventional limitations of traditional muffler solutions while maintaining the compact and lightweight characteristics of scroll compressors.

Source