A constant temperature air circulation system is provided. Air valves are installed behind two three-way nodes of a main circulation loop and parallel bypasses to adjust a flowing amount of gas of each branch. When a compressor keeps a current state unchanged, a draught fan and air valves do not change. When the compressor needs to be turned on and then to be turned off, an air volume of the draught fan is adjusted, and the flowing amounts of the bypasses and a main circuit are simultaneously adjusted until the air valves that control a flowing amount of an evaporator are all closed and the air valves of the bypasses are all opened. Adjustment of the air valves and state switching of the compressor are made at the same time, so that the flowing amount flowing through a heater to a chamber is ensured to always remain unchanged.

A constant temperature air circulation system is provided. Air valves are installed behind two three-way nodes of a main circulation loop and parallel bypasses to adjust a flowing amount of gas of each branch. When a compressor keeps a current state unchanged, a draught fan and air valves do not change. When the compressor needs to be turned on and then to be turned off, an air volume of the draught fan is adjusted, and the flowing amounts of the bypasses and a main circuit are simultaneously adjusted until the air valves that control a flowing amount of an evaporator are all closed and the air valves of the bypasses are all opened. Adjustment of the air valves and state switching of the compressor are made at the same time, so that the flowing amount flowing through a heater to a chamber is ensured to always remain unchanged.

A heating, ventilation, and air conditioning (HVAC) door assembly includes a first HVAC door rotating about a first axis, a second HVAC door rotating about a second axis that is nonparallel with the first axis, an actuator, a mode cam. The mode cam is engaged with the actuator and controls movement of the first HVAC door and the second HVAC door.

A heating, ventilation, and air conditioning (HVAC) door assembly includes a first HVAC door rotating about a first axis, a second HVAC door rotating about a second axis that is nonparallel with the first axis, an actuator, a mode cam. The mode cam is engaged with the actuator and controls movement of the first HVAC door and the second HVAC door.

A window air conditioner is provided. The window air conditioner has a housing, an indoor air duct shell, an outdoor air duct shell and a fresh air duct shell. The housing has an indoor air inlet and an indoor air outlet communicated by an indoor air duct formed by the indoor air duct shell. The housing also has an outdoor air inlet and an outdoor air outlet communicated by an outdoor air duct. A fresh air opening communicated with the indoor air duct is provided on the back surface of the indoor air duct shell. The outdoor air duct shell forms a high-pressure area of the outdoor air duct and has a vent for an airflow in the high-pressure area of the outdoor air duct to pass. The fresh air duct shell has a fresh air duct communicating the vent with the fresh air opening.

A window air conditioner is provided. The window air conditioner has a housing, an indoor air duct shell, an outdoor air duct shell and a fresh air duct shell. The housing has an indoor air inlet and an indoor air outlet communicated by an indoor air duct formed by the indoor air duct shell. The housing also has an outdoor air inlet and an outdoor air outlet communicated by an outdoor air duct. A fresh air opening communicated with the indoor air duct is provided on the back surface of the indoor air duct shell. The outdoor air duct shell forms a high-pressure area of the outdoor air duct and has a vent for an airflow in the high-pressure area of the outdoor air duct to pass. The fresh air duct shell has a fresh air duct communicating the vent with the fresh air opening.

An air conditioner unit is configured for automatically detecting a restricted duct and adjusting fan speed schedules in response. The air conditioner unit includes an indoor fan including a drive motor for selectively rotating the indoor fan to urge a flow of air through the indoor portion and a controller is configured for sending a control signal to the drive motor to rotate the indoor fan to an actual fan speed. Based on the actual fan speed and a unit voltage, the controller obtains a target control signal, e.g., via a lookup table, and determines that a restricted duct condition exists if the control signal is different than the target control signal. The controller adjusts the operation of the indoor fan in response to determining that the restricted duct condition exists.

An air guide grille is provided, the air guide grille includes a plurality of grid strips, wherein the plurality of grid strips are arranged in a plurality of rows, an air inlet side edge of each of the plurality of grid strips is of a corrugated shape, and an air inlet side edges of two adjacent rows of grid strips in the plurality of grid strips is provided in a staggered manner along a length direction of the corrugation. In order to form a corrugated air inlet between two adjacent rows of gate strips, the each of the plurality of grid strips has an air guide surface inclined toward a first direction along the air guiding direction thereof, and the first direction is parallel to an undulating direction of a corrugation. In addition, an air inlet panel and an air conditioner are also disclosed.

An air guide grille is provided, the air guide grille includes a plurality of grid strips, wherein the plurality of grid strips are arranged in a plurality of rows, an air inlet side edge of each of the plurality of grid strips is of a corrugated shape, and an air inlet side edges of two adjacent rows of grid strips in the plurality of grid strips is provided in a staggered manner along a length direction of the corrugation. In order to form a corrugated air inlet between two adjacent rows of gate strips, the each of the plurality of grid strips has an air guide surface inclined toward a first direction along the air guiding direction thereof, and the first direction is parallel to an undulating direction of a corrugation. In addition, an air inlet panel and an air conditioner are also disclosed.

An air conditioner includes a heat exchanger for exchanging heat with air brought into a housing, and a blower fan for blowing air that has exchanged heat with the heat exchanger out of the housing, and controls a guide unit that opens or closes part of an outlet provided in the housing to blow out various flows of air.