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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Air guide ring assembly for reducing noise and improving airflow in air conditioners. The assembly has a main body, expanding section, and connecting section forming an air channel. The expanding section has a larger diameter than the main body to increase airflow velocity. An annular bulge on the main body near the connecting section reduces gap between the wind wheel and inner wall. This improves blade tip airflow, reduces vibration, and noise.

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Air conditioner with a cover surrounding the compressor and expansion device to reduce noise and vibration. The cover is made of elastic material and has separate body parts for the compressor and expansion device. The body parts can rotate relative to each other to divide the internal space. This allows the cover to enclose the compressor and expansion device without gaps for better noise and vibration isolation. The cover also has partition walls to separate the compressor and expansion device sections further.

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A vibration protection system for air conditioner outdoor units that monitors vibrations and stops the compressor if frequencies exceed safe levels to prevent damage to the unit and surrounding structure. The system has modules to monitor vibrations, refrigerant flow, and temperatures. It analyzes vibration sources based on refrigerant flow and temperature data. If vibrations exceed safe levels, it stops the compressor to prevent resonance issues. This prevents compressor faults from causing excessive vibrations that harm the unit and building structure.

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An air conditioner outdoor unit frame assembly and an air conditioner that provides improved stability and vibration isolation for the outdoor unit components. The frame assembly has a detachable chassis bracket, lower beam, and entablature above it. The motor is mounted on the lower beam. A guide ring above the motor discharges air. The frame has a connecting beam between the lower and upper beams. This allows the motor vibrations to transfer to the lower beam instead of the chassis. The detachable connections allow component removal for servicing.

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Flexibly adjustable support structure for air conditioner evaporators that reduces vibration and noise compared to existing designs. The structure has a main bracket with end plates, a front groove, and a shock absorption component. A movable bent rod with a limiting block clamped in a long chute and a fixed bent rod with an arc-shaped end clamped in a limiting groove. This allows vertical adjustment of the evaporator while preventing excessive movement. The shock absorption component reduces vibration transfer. The flexible adjustment and damping improves evaporator performance in air conditioners.

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Fan control system for air conditioners with cabinet-style indoor units that uses an annular electrifying device on the fan blades to stabilize motor speed. Permanent magnets are placed on the motor volute. When the fan blades rotate, the annular device contacts brushes to apply force. By adjusting annular device current based on motor speed difference, it changes blade force and loads. This stabilizes motor speed and reduces noise, vibration, and energy consumption compared to unstable motor speeds.

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Rotary dehumidifier with adjustable shock absorption to reduce vibration and noise during operation. The dehumidifier body has adjustable feet with ball joints, telescopic rods, and mounting seats. The feet can be extended/contracted to level the dehumidifier on uneven surfaces. The telescopic rods have buffer springs and fluid-filled chambers to absorb vibrations. The adjustable feet and telescopic rods synchronously move when driven by inner components. A mechanism controls the inner components to symmetrically move left and right.

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A method to minimize noise and vibration when switching cooling to heating or vice versa in a multi-zone air conditioner system with simultaneous cooling and heating capability. The method involves gradually opening a bypass valve instead of suddenly opening the main valve. This allows the refrigerant to flow slowly and prevent rapid flow issues. It also involves preconditioning the refrigerant temperature to equalize pressure before opening the main valve. This reduces the pressure differential and vibration.

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Air conditioner design to improve sealing, prevent insect/mice entry, and reduce vibration and noise compared to conventional designs. The air conditioner shell has a grid structure on the middle frame that allows airflow while preventing debris entry. This replaces the suspended panel and door setup that can have leakage and vibration issues. The grid structure can have vertical holes perpendicular to the frame length. The grid attaches to the base and middle frame.

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Simultaneous cooling and heating air conditioner that reduces piping vibration and refrigerant flowing noise when switching between cooling and heating modes. The method involves a controlled transition to prevent large pressure differences across valves. When switching from cooling to heating, the low-pressure expansion valve is closed first, then the high-pressure valve is opened when the internal temperature rises. When switching from heating to cooling, the high-pressure valve is closed first, then the low-pressure valve is opened when the internal temperature drops. This gradual opening prevents large pressure differences that cause vibration and noise.

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Reducing noise from compressors in indoor air conditioning units by using a multi-level vibration isolation system. The compressor is mounted on a chassis with two positions. An inner heat exchanger is mounted at the first position. The compressor connects to the inner heat exchanger and has a foot. The compressor is mounted at the second position and the foot connects to the chassis. Between the foot and chassis is a first level of vibration isolation. Between the first level and chassis is a second level of vibration isolation. This two-stage isolation system significantly reduces compressor vibration and noise compared to just foot pads or isolation pads.

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Reducing low-frequency vibration and noise in single-rotor compressors of air conditioners by dynamically adjusting compensation currents based on operating conditions. The method involves switching moment and torque compensation coefficients when the compressor runs at low frequency, matching target compensation amounts based on split flow mode and outdoor temp. This adaptive compensation helps restrain vibration at low speeds.

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Heat pump design with improved compressor decoupling to reduce vibrations and improve reliability. The compressor and other heat pump components are connected only by the fluid lines and spring elements attached to the housing, rather than rigidly fastening the components together. This allows the compressor to isolate and move slightly during operation, reducing vibrations and stress on the connections.

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Air conditioning unit designed to significantly reduce vibration and noise compared to conventional units. The unit uses particle damping vibration absorbers in strategic locations like fan ports, side walls, and the bottom. Additionally, vibration isolators are used at the bottom chassis. This configuration, optimized through vibration analysis, provides improved vibration and noise isolation compared to traditional single-layer vibration isolation. The unit is installed by testing vibrations, modeling, calculating absorber/isolator characteristics, and then installing the optimized components.

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Damping assembly for an air conditioner to prevent refrigerant pipes from contacting and vibrating against each other during transportation and operation, reducing noise and improving use comfort. The assembly has a pad with spaced mounting holes for the pipes. Damping members with movable ends are connected to the pad base. Pipes pass through the holes and snap in. This allows the pipes to separate and absorb vibrations when moving. The pad can be fixed to the air conditioner housing.

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Air conditioner indoor unit with improved blade design to reduce vibration and noise. The indoor unit has a rotatable blade at the outlet to control airflow. The blade is connected to a motor that generates rotational force. The blade also has a material with restoring force. A buffer member connects the blade and transmission to balance the blade when the unit is not perfectly level. This prevents blade vibration and noise when rotating.

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Air conditioner system that reduces noise and vibration compared to conventional systems. The system uses an energy storage and noise reduction system between the compressor and valve. This system can switch between an energy storage state and release state. When the air conditioner starts, the energy storage system is switched to release high pressure into the system. This rapidly increases pressure before the valve, allowing it to quickly move into position without stalling. The energy storage system then clips peak pressure fluctuations to stabilize system pressure and reduce noise.

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Air conditioner housing design to reduce vibration and surge noise during heating operation. The housing has a sinking platform inside the main body between the fan blade and air outlet. The platform has an oblique end facing towards the outlet. This causes the fan blade and sinking platform airflows to collide and mix at an angle, preventing vortex formation and reducing vibration/surge noise compared to parallel flow paths.

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Vibration damping device for air conditioners that reduces vibration and shock in fan assemblies. The damping device has a support plate with a column, a shell with an elastic piece, and limiting pieces. When the fan vibrates, the column moves the elastic piece which compresses to dampen vertical vibration. Horizontal vibration is damped by limiting column movement. This allows the fan to vibrate less.

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Air conditioner outdoor unit with vibration isolation to reduce noise transmission. The isolation structure has a foot with a mounting hole and a vibration isolation member with a connection hole. The connection hole allows the isolation member to be inserted into the mounting hole. A positioning member in the connection hole prevents misalignment. This allows the foot and isolation member to separate and move slightly to isolate vibrations without needing complex assembly methods. The foot also has a rotation limit feature to prevent excessive rotation.

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Air conditioning unit and cabinet design to reduce noise levels by absorbing vibrations from the air conditioner components. The air conditioner has an integrated unit that fits into a slot in the cabinet. Vibration dampening pads and mats are placed between the slot and the unit housing, as well as between the unit components and the housing, to isolate and absorb vibrations. This reduces the transmission of vibrations through the cabinet and airflow ducts, decreasing noise.

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Preventing eddy currents inside an air conditioner's indoor unit to reduce fan efficiency loss and noise/vibration generation. The prevention device is located between the upper surface of the indoor unit and the fan assembly, on top of the fan assembly, and in spaces around the heat exchanger and fan assembly to block undesired flow paths. This reduces eddy currents without needing to resize the heat exchanger or fan.

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Air conditioner indoor unit with a metal front panel to reduce vibration and noise compared to a plastic front panel. The metal front panel is attached to the case body using a bracket to prevent separation. This prevents vibrations from the blower fan to transfer to the front panel and reduce noise. The metal front panel is also movable vertically to adjust airflow direction.

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Air conditioner positioning device and control method to reduce vibration noise in air conditioners. The device has adjustable height compression space between two connecting pieces that can be extended or compressed. When the AC starts, the upper connecting piece moves to release the compression, allowing the compressor foot pad to compress and absorb vibrations. During normal operation, the upper piece is compressed to prevent excessive pad deformation. Acceleration sensors monitor vibration levels and adjust compression depth if excessive. This dynamically adjustable compression allows optimal vibration reduction without sacrificing pad compression.

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Air conditioner noise reduction device that attaches to the exterior unit of an air conditioner to significantly reduce noise levels. The device uses magnetic blocks, connecting rods, springs, and slides to create a vibration isolation system. The bottom plate of the device slides vertically in a groove. Magnetic blocks repel each other to absorb vibrations from the air conditioner unit. Connecting rods push slides with springs to compress against the groove walls. This further isolates vibrations. The device also has features like sound insulation plates, clamping assemblies, and a flashing buffer to protect the unit and absorb impacts.

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Air conditioner with improved stability of the air outlet frame to reduce vibration and noise. The air conditioner has an air outlet frame that integrates the mounting location for the driving box assembly. This provides a more stable base for the driving box assembly compared to the prior art where the driving box assembly was not directly mounted on the air outlet frame. The integrated mounting also eliminates the need for separate bolts or connections between the air outlet frame and the front panel. This improves stability and reduces vibration when the driving box assembly moves the sliding door.

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Air conditioner control method to mitigate vibration and noise issues in inclined installations. The method involves monitoring vibration of the external unit, detecting if it exceeds a threshold, determining if the unit is horizontal, and if not, adjusting the base to level it. If vibration persists, optimizing compressor frequency and fan speed to reduce it. This prevents pipe cracking and air leakage from tilted units, and reduces noise from resonance.

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Limiting vibration damper for compressors in air conditioners to reduce noise and improve reliability. The damper has a bidirectional limiting structure between the compressors that absorbs vibration in multiple directions. It consists of elastic members, limit blocks, and locking pieces. The damper connects the compressor housings and prevents shifting due to vibration. It also has buffer members inside the housings to further absorb vibration. The damper optimizes length, width, and height ratios to balance elasticity. This reduces vibration between compressors and improves overall system stability.

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Variable capacity air conditioning system that reduces vibration, noise and improves user experience compared to conventional variable capacity systems. The system uses an accumulator on the pipeline between the compressor's exhaust and the variable capacity cylinder's control port. This absorbs and inhibits pulsations caused by compressor switching or variable cylinder movement. A check valve between the accumulator and condenser further suppresses pulsations.

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Device and method to suppress beat vibration in equipment like air conditioners. The device has a vibration detection element on the equipment base and an excitation element that can vibrate the base. A control module connects to both elements and adjusts the excitation vibration based on the detected base vibration. This proactive vibration countermeasure prevents beat vibration between components by matching frequencies and amplitudes.

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