Vibration Control in HVAC Systems

A refrigeration cycle apparatus with reduced vibration noise, comprising a compressor, a refrigerant circuit, and a vibration isolating system. The system includes a vibration isolating member supporting the compressor, a support member supporting the vibration isolating member, and a rigid member attached to the pipe connected to the compressor. The rigid member is supported by the support member, and an elastic member may be provided to further reduce vibration transmission. The apparatus may also include a soundproof box covering the compressor and components of the refrigerant circuit, with a pipe hole and lid members to seal the connection between the pipe and the box.

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Heating, ventilation, and air conditioning (HVAC) terminal unit with improved airflow distribution and noise reduction compared to traditional units. The terminal unit has a sound attenuator positioned opposite the air inlets that directs return airflow into the unit. This balances the airflow distribution to the blowers and reduces noise compared to uneven airflow. The attenuator has an inlet facing the return air inlet and outlet into the unit. Baffles inside the unit further direct the airflow. This balanced airflow reduces blower speeds, pressure losses, and noise compared to uneven flow.

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Indoor unit for a heating, ventilation, and air conditioning (HVAC) system that reduces noise and vibration compared to conventional units. The indoor unit has a housing with a fan cavity and a diffuser cavity that communicate. The fan is in the fan cavity. A shoulder is added at the end of the air inlet surface that matches a volute tongue surface. This positions the vortex between the fan and the inlet closer to the fan and volute, reducing blockage of the inlet and diffusion cavity. This prevents the vortex from occupying the inlet too much, increasing the effective flow area and reducing channel blockage. This reduces backflow, surge, and noise in the unit.

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Air conditioner with vibration-dampening refrigerant flow path unit, comprising a refrigerant flow path unit, a refrigerant flow path, and a heat exchanger, wherein the refrigerant flow path unit is designed to suppress damage from vibration.

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Air outlet device for reducing noise in air conditioners and other HVAC equipment. The device has an inner shell with splitters that divert and disperse the airflow. The air inlet splitter shunts some air to prevent direct upward punching. The air outlet splitter disperses the flow for smoother exit. This reduces impact forces and vibration that create noise. The splitter design optimizes airflow in the confined space of the air outlet housing.

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Base pan for outdoor HVAC units that reduces vibration and simplifies design compared to current stamped metal base pans. The base pan has an insert that fits into it and connects to the compressor. The insert has an overhang that overlaps the base pan surface when installed. An isolator material between the overhang and base pan absorbs vibrations. This allows using a single insert design for multiple compressor sizes instead of custom base pans for each compressor.

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Refrigeration cycle device with reduced noise and vibration compared to conventional designs. The device has a compressor covered by a soundproof box. The compressor is supported by a two-layer vibration isolation structure. The soundproof box itself is further supported on a separate vibration isolator. This prevents vibrations from the compressor being transmitted to the soundproof box and reducing noise.

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Reducing fan noise in HVAC systems by using an acoustic shroud around the fan blades. The shroud has an inner wall inside the outer wall. An acoustic damping material is sandwiched between the walls. The inner wall is permeable to air flow. The shroud encircles the fan blades to attenuate noise as the fan spins. The inner wall allows air to pass through while the damping material absorbs vibrations and sound.

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Reducing noise from fresh air handling units and VAV boxes in HVAC systems by using detachable noise reduction devices. The devices have cushioned bases that attach to the mounting surfaces and enclosures that cover the equipment. They surround the units and reduce noise and vibration transfer to the surrounding environment. The bases have connectors for the enclosures to attach to. The enclosures have openings for air inlet and outlet pipes to pass through. They are removable for access to the units. This isolation helps mitigate fan, vibration, and airflow noise from the HVAC equipment.

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Acoustic metamaterial noise control system for HVAC ducts that reduces noise propagation through ducted HVAC systems by using micro-perforated acoustic metamaterials. The system combines absorptive materials with acoustic metamaterial principles to significantly reduce sound radiation within or emanating from ducts. The metamaterial blocks are placed at duct ends and contain stacked micro-perforated sheets with specific dimensions and spacing to absorb and reflect sound waves. The metamaterials have anisotropic acoustic properties engineered using transformation acoustics theory to enhance noise reduction over broadband frequencies.

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A vibration damping component for HVAC systems that reduces noise by absorbing vibrations between the fan guard and the housing. The component is placed between the fan guard and housing to absorb vibrational energy that would otherwise be transferred between the fan guard and housing. The component can be a clip that attaches to the fan guard before mounting, or an adhesive applied to the housing before mounting the fan guard. The component has a slot with a wider length than the fan guard/housing openings to accommodate size variations.

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A vibration dampening support for an HVAC unit that reduces vibrations from the unit and protects it from damage. The support has a spring housing that contains a compression spring. The spring housing is attached to a pedestal plate and a mounting tube that connects to the HVAC unit. The spring absorbs vibrations from the unit and transfers the load to the pedestal plate.

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Compact noise reduction structure for heating and ventilation systems that effectively reduces noise without significantly impacting airflow. The structure uses acoustic metamaterial principles to provide high performance low frequency noise reduction in a compact size. It consists of a throat and slits that resonate at certain frequencies when air columns vibrate between them, consuming acoustic energy and reducing noise. This allows compact noise reduction compared to traditional bulky silencers.

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Vibration isolation device for mounting building equipment like rooftop HVAC units that reduces vibration transmission to the building structure and noise pollution. The device has a mounting seat for the equipment, a vibration isolation supporting assembly with a shell and a supporting rod, and a torsion damping mechanism. The damping mechanism has a connecting rod connecting to the seat, a transmission rod extending from a torsion damper, and a sliding block hinged to the supporting rod. Vibration of the seat converts to swinging of the torsion damping mechanism.

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Controlling a multi-fan assembly in an HVAC system to avoid excess vibrations caused by operating at resonance speeds. The control scheme involves detecting if the desired airflow requires operating the fans at resonance speeds. If so, it instructs the fans to operate at speeds that straddle the resonance speeds. This prevents the fans from driving each other into excessive vibration when operating at their natural frequencies. By diverging the fan speeds from resonance, the fan assembly moves the air without causing excess vibrations.

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Reducing noise in HVAC systems by breaking up airflow structures that cause whistling and hissing when air flows through gaps around partially open doors. The solution involves adding protrusions above and below the door that create turbulent flow when air passes over them. This breaks up the smooth laminar airflow into smaller structures which reduces vibrations and noise.

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Noise reduction for HVAC systems using a vibration isolated compressor enclosure. The compressor and associated heat exchangers are mounted on a removable chassis that sits inside an enclosure. The chassis has vibration dampers between it and the enclosure frame to isolate the compressor vibrations from the enclosure. This prevents the enclosure from transmitting the compressor noise into the surrounding space. The chassis and refrigerant loop are designed to maintain a gap from the enclosure to further isolate the vibrations.

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Silencing apparatus for HVAC systems to reduce noise generated by airflow through ducts. The apparatus has a muffler shaped like an L that attaches to the duct wall. It contains acoustical panels, impurity absorption sticks, and a heat radiating net to absorb and scatter sound waves. The muffler shape provides directional noise reduction. The inner cotton layer reduces vibration. The sticks capture impurities to prevent damage to the panels. The net dissipates heat from the ducts to prevent resonance.

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Indoor unit for an air conditioner that reduces vibration transmission from the blower to the cabinet and provides space for components like insulators and wiring during installation. The unit has a cabinet with a larger bottom area compared to the sides, and the bottom has steps between forming and unforming sections. This configuration isolates blower vibrations from the cabinet walls and prevents components from touching the bottom. It also allows better airflow uniformity when discharging. The larger bottom area provides space for components and prevents condensation.

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Vibration dampers for ventilation devices like residential HVAC systems that reduce vibrations from the fans and motors. The dampers have multiple damping elements to provide soft mounting of the fan unit in axial and circumferential directions. This prevents vibrations from being transmitted through the ductwork. The dampers can have separate damping areas to further control vibration damping in different directions.

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