A mode switcher includes at least one mode conversion branch. The mode conversion branch includes: a liquid pipe section, a high-pressure gas pipe section and a low-pressure gas pipe section. The mode switcher further includes a high-pressure electronic expansion valve and a low-pressure electronic expansion valve, the high-pressure electronic expansion valve and the low-pressure electronic expansion valve are respectively arranged in series in the high-pressure gas pipe section and the low-pressure gas pipe section, so as to gradually be opened and closed during air conditioning mode switching to reduce a differential pressure between before and after a mode conversion operation. A heat recovery multi-split air conditioning system and control method are further provided.

An air conditioner includes a cross-flow fan having a cylindrical shape, and a heat exchanger disposed on an upstream side of an air flow of the cross-flow fan. The cross-flow fan includes a plurality of impellers. Each of the impellers includes a plurality of blades arranged in a circumferential direction. A clearance is formed between the cross-flow fan and the heat exchanger. The clearance has a dimension no more than 20% of a diameter of each of the impeller. The impellers are arranged with at least one of the blades displaced between each adjacent two of the impellers. A number of the impellers arranged along a rotation axis is at least 14 and no more than 30 in the cross-flow fan.

A window type air conditioner includes an indoor heat exchanger, an outdoor heat exchanger and a motor disposed in the shell. Rotating shafts at two ends of the motor are provided with an indoor fan and an outdoor fan. A thermal insulation partition is disposed on a bottom plate of the shell and divides the shell into an indoor side and an outdoor side. The thermal insulation partition includes a front clapboard fixed on the bottom plate of the shell and a thermal insulation volute disposed on the front clapboard. The indoor heat exchanger and the indoor fan are located in the thermal insulation volute. An integrated bracket is provided with a first mounting part for mounting and fixing the outdoor heat exchanger, a second mounting part for mounting and fixing the motor, and third mounting parts for connecting and fixing the front clapboard.

An energy efficient and quiet air cooling system for a building structure is provided. The air cooling system includes an evaporator system mounted in the wall of the building, a remotely mounted fan, an air intake, and a sound and heat insulating duct. The fan is mounted in the attic and configured to draw air from the living area of the building through the sound insulating duct with sufficient power to create a negative static pressure in the living area. The negative static pressure in turn causes outside air to flow through the evaporator system which removes heat from the outside air. The cooled air is in turn drawn into the building and pulled into the attic through the duct and expelled through the attic. The fan expels warm air into the attic, creating a positive pressure environment which causes the warm air to be expelled from the attic through natural vents.

A method of forming a sound attenuator around a compressor of an air conditioning system includes providing a molding cover, positioning a compressor of an air conditioning system in a cavity of the molding cover, and placing a first material in the cavity of the molding cover. The method further includes placing a second material in contact with the first material in the cavity of the molding cover. The first material and the second material chemically react with each other to form a self-forming foam around the compressor.

In a signal processing device, a signal processing method, a recording medium, and a rangehood apparatus, a filter coefficient is set in a sound cancelling filter, and the sound cancelling filter outputs a cancellation signal. A coefficient calculator calculates a first filter coefficient. An oscillation suppressor calculates a second filter coefficient by applying a window function to the first filter coefficient to set the second filter coefficient as the filter coefficient.

A sound suppression chamber for a heating, ventilation and air conditioning (HVAC) air handling assembly including a first end, a second end, and a middle portion. The first end includes an aperture that resonates with airflow from the HVAC air handling assembly, the airflow from the HVAC air handling assembly generating an incident sound wave corresponding to a target tone. The second end is closed and opposite the first end. The middle portion extends between the first end and the second end. The first end, the second end, and the middle portion defining a cavity of the sound suppression chamber. The sound suppression chamber generates a reflected wave that is 180 degrees out of phase from the incident sound wave and reflected into the HVAC air handling assembly through the aperture to suppress the target tone.

The present invention relates to a smart air purifying ventilator installed on a window frame. More specifically, the smart air purifying ventilator of the present invention includes a frame part installed on a window frame and having two or more openings formed therein, a blowing part installed in the frame part and responsible for introducing or discharging air through the openings, filters for purifying air introduced or discharged by the blowing part, an outdoor side cover part coupled to one side of the frame part, a front panel part coupled to another side of the frame part, and a control unit for comparing the inside and outside air conditions of the window frame and controlling the blowing part to determine inflow or outflow of air.

A heat pump includes a compressor for compressing a coolant and a further heat pump component through which the coolant flows, the compressor being designed to be connected to the further heat pump component in order to convey the coolant via fluid lines, and the compressor and the further heat pump component being designed to be connected to a housing of the heat pump via spring elements in order to reduce transmission of structure-borne sound. The compressor and the further heat pump component are designed to be firmly connected to one another exclusively, on the one hand, via the fluid lines which connect them and, on the other hand, via the spring elements connected to the housing of the heat pump.

An air-conditioning apparatus includes an air inlet through which air is suctioned; a fan configured to generate an air flow by suctioning the air from the air inlet; an electrical component box having a box body housing a control board configured to control an actuator provided in a main body, a lid that covers an opening of the box body, and a flange part positioned in a flow path of the air flow, the flange part being for fastening the lid to the box body; and a flow straightening part that covers the flange part.