Abstract: In a compression unit, an upper compression unit suction tube is connected to an upper suction hole of an upper cylinder, and a lower compression unit suction tube is connected to a lower suction hole of a lower cylinder. In an accumulator shell of an accumulator vessel, an accumulator suction tube, an upper gas-liquid separation tube, and a lower gas-liquid separation tube penetrate a side wall of the accumulator shell, and are fixed by welding to a first through hole, a second through hole, and a third through hole of the accumulator shell, respectively. The upper gas-liquid separation tube is connected to the upper compression unit suction tube via an upper connecting tube outside the accumulator shell. The lower gas-liquid separation tube is connected to the lower compression unit suction tube via a lower connecting tube outside the accumulator shell.

Abstract: A compressor includes a rotor core, a stator configured to rotate the rotor core about a rotational axis, and a compressing unit that is driven as the rotor core is rotated, wherein the rotor core includes a stack of a plurality of core sheets, each core sheet of the core sheets has a balancing hole by which a center of a mass of the core sheet is offset in a radial direction from the rotational axis, the rotor core includes an eccentric portion and an eccentricity alleviating portion, the center of a mass of the eccentric portion is offset in the radial direction from the rotational axis, and in the eccentricity alleviating portion, the eccentricity of the balancing holes of some of the core sheets is canceled out by the eccentricity of the balancing holes of others of the core sheets.

Abstract: A bulkhead heat exchanger includes a first bulkhead, a second bulkhead, and a plurality of flow path walls which divide a space formed between the first bulkhead and the second bulkhead into a plurality of first flow paths, wherein the first bulkhead and the second bulkhead separate the plurality of first flow paths from a plurality of second flow paths through which a second fluid different from a first fluid flowing through the plurality of first flow paths flows, the plurality of flow path walls have the plurality of wall surfaces, and the plurality of wall surfaces conform to sine curves different from each other, respectively.

Abstract: In a compression unit, an upper compression unit suction tube is connected to an upper suction hole of an upper cylinder, and a lower compression unit suction tube is connected to a lower suction hole of a lower cylinder. In an accumulator shell of an accumulator vessel, an accumulator suction tube, an upper gas-liquid separation tube, and a lower gas-liquid separation tube penetrate a side wall of the accumulator shell, and are fixed by welding to a first through hole, a second through hole, and a third through hole of the accumulator shell, respectively. The upper gas-liquid separation tube is connected to the upper compression unit suction tube via an upper connecting tube outside the accumulator shell. The lower gas-liquid separation tube is connected to the lower compression unit suction tube via a lower connecting tube outside the accumulator shell.

Abstract: A ceiling-embedded air conditioner includes a main unit, and a decorative panel that has an intake port and an outlet guide tube, wherein the main unit includes a box-shaped housing, a heat exchanger that is disposed inside the housing, a fan unit that is disposed inside the housing and collects air from the intake port and discharge the air from an outlet tube, and a drain pan that has an outlet port opening through which the air discharged from the outlet tube passes toward the outlet guide tube, the outlet guide tube has a top opening communicating with the outlet tube, a bottom opening facing a direction below a front plate of the housing, and a curved outlet ventilation path connecting the top opening to the bottom opening, and a bottom end of the bottom opening protrudes more downwards than the decorative panel does.

Abstract: Provided is a rotary compressor excellent in energy saving performance and reliability that can suppress over-compression of a compressed refrigerant compressed in a compression chamber. A rotary compressor includes a discharge port provided on an end plate and partially located outside a cylinder inner wall and a discharge groove provided on the cylinder inner wall and communicating with a compression chamber and the discharge port, the compression chamber compressing a refrigerant by contracting as an annular piston revolves, in which the discharge port faces an end portion of a vane groove on the cylinder inner wall on the compression chamber side.

Abstract: Provided is a rotary compressor excellent in energy saving performance and reliability by improving sliding performance of a sliding portion and ensuring sealability in a working chamber. An oil groove is formed at a position facing a vane end face on an end plate. The oil groove communicates with an inside of a sealed container, and is exposed in a gap between a leading end surface of a vane and an outer peripheral surface of an annular piston formed when the leading end surface of the vane is in abutment on the outer peripheral surface of the annular piston.

Abstract: A lower end plate cover is provided with a bulging portion. In a circumferential direction of a rotary shaft, a plurality of bolt holes includes a first bolt hole arranged between a distal end portion and a proximal end portion of the lower discharge valve, a second bolt hole arranged in a position adjacent to the first bolt hole on a side close to a lower vane groove with respect to the first bolt hole, and a third bolt hole arranged in a position adjacent to the first bolt hole on a side away from the lower vane groove with respect to the first bolt hole. When the bulging portion is divided into a first bulging portion and a second bulging portion using a first straight line, the first bulging portion is larger than the second bulging portion.

Abstract: An air conditioner includes a refrigerant circuit that is formed by connecting an indoor unit to an outdoor unit, where the circuit is filled with a predetermined amount of a refrigerant. The conditioner includes an obtainer that regularly acquires an operating state quantity at a time of air conditioning operation, a storage that stores therein the quantity that is acquired, a model that estimates a refrigerant remaining amount in the circuit by using the quantity, a detector that detects one of a first quantity being an operating state quantity in a state in which the circuit meets a first condition and a second quantity being an operating state quantity in a state in which the circuit meets a second condition that is different from the first condition, and a controller that estimates the remaining refrigerant amount in the circuit by using the model and the detected quantity.

Abstract: A compressor includes a motor unit that includes a rotor and a stator, a compressor unit that compresses a refrigerant by rotation of the rotor, and a container that forms an internal space in which the motor unit and the compressor unit are housed, wherein in the rotor, a rotor gas passage through which the refrigerant flows from an under-motor space of the internal space arranged on a side of the motor unit that is close to the compressor unit to an above-motor space of the internal space arranged on a side of the motor unit that is distant from the compressor unit is formed, in the stator, a stator gas passage through which the refrigerant flows from the under-motor space to the above-motor space is formed, and a cross-sectional area of the stator gas passage is 6.0 times or less a cross-sectional area of the rotor gas passage.

Abstract: A compression unit of a rotary compressor includes a cylinder, an upper end plate that closes the upper side of the cylinder, a lower end plate that closes the lower side of the cylinder, and a piston that is fitted to a rotating shaft, revolves along an inner peripheral surface of the cylinder, and forms a cylinder chamber in the cylinder. At least one of an end face of the piston in the axial direction of the rotating shaft, a sliding surface of the upper end plate that slides with the end face of the piston, and a sliding surface of the lower end plate that slides with the end face of the piston, has formed therein an oil-film retention region having an array of a plurality of recessed portions that retain lubricating oil.

Abstract: A server device includes a collecting unit that stores operation history data collected from an air conditioner in a server-side storage device, a learning unit that stores a learning model generated based on the operation history data in the server-side storage device, a sending unit that sends the learning model to the air conditioner such that the air conditioner performs air conditioning inside a room by using the learning model, and an erasing unit that erases the operation history data and the learning model from the server-side storage device when an erasure instruction signal sent from the air conditioner is received.

Abstract: A heat exchanger includes flat tubes, a header to which the flat tubes are connected, an inflow plate that separates a refrigerant inflow portion and a lower circulation portion, a vertical dividing plate that separates the lower circulation portion and an upper circulation portion, a lower dividing plate that divides the lower circulation portion into a lower ascent path on an internal side and a lower descent path of an external side, and an upper dividing plate that divides the upper circulation portion into an upper ascent path on a leeward side, and an upper descent path on a windward side, wherein the inflow plate includes an ejection hole on a leeward side and an internal side, and the vertical dividing plate includes a first passing port on a leeward side and an internal side, and a second passing port on a windward external side.

Abstract: An air conditioning system includes a plurality of air conditioners; a server that is connected to each of the air conditioners via a communication network and that stores device information on each of the air conditioners; and a terminal that is connected to each of the air conditioners via the server. The server includes a classification unit that classifies the plurality of air conditioners into a plurality of groups based on the device information, and a notification unit that notifies the terminals of information related to a test run of each of the air conditioners that are classified into the groups. As a result, it is possible to reduce a work load of a maintenance worker in a distributed manner in an intermediate period by performing the test run of each of the air conditioners in a distributed manner.

Abstract: A compressor includes: a compressor; and a motor that is disposed in the compressor housing. The motor has a rotor provided coaxially with respect to a rotary shaft of the compression part, and a stator disposed on an outer peripheral side of the rotor. In the stator, a plurality of large-diameter parts in contact with an inner peripheral surface of the compressor housing and a plurality of small-diameter parts, each of the small-diameter parts having a distance from a rotation center of the motor to an outer peripheral surface, the distance being smaller than the distance of the large-diameter part, are formed in a circumferential direction of the stator. The stator is provided with a plurality of welded parts joining the inner peripheral surface of the compressor housing with the outer peripheral surface of the stator, and the welded parts are provided in the small-diameter part of the stator.

Abstract: An air conditioning system includes an air conditioner and an adapter that connects the air conditioner and an external server device. The adapter includes a first updating unit and a second updating unit. The first updating unit updates, when a new learning model that provides a recommended operation to a control unit included in the air conditioner is received from the external server device, the learning model by using a first update method. The second updating unit updates, when an update purpose control program that updates a control program for the air conditioner is received from the external server device, the update purpose control program by using a second update method that is different from the first update method. It is possible to reduce an adapter load by updating the learning model and the control program by using different methods.

Abstract: A heat exchanger includes: a plurality of flat tubes that are stacked in a direction perpendicular to a refrigerant flow direction, and a plurality of fins that have a first flat tube insertion portion into which a first flat tube among the plurality of flat tubes is inserted, and a second flat tube insertion portion into which a second flat tube adjacent to the first flat tube is inserted. A first fin has, formed on the inner periphery of the first flat tube insertion portion, a cut and raised piece for spacing a fin pitch between the first fin and an adjacent second fin. The cut and raised piece has a raised portion of the same length as the fin pitch, and a folded portion that is folded back at the tip of the raised portion and that is in contact with the second fin.

Abstract: A compressor includes a rotor, a stator configured to rotate the rotor, a compressor unit configured to compress a refrigerant with rotation of the rotor, and a housing in which an internal space for housing the rotor, the stator, and the compressor unit is formed, wherein the rotor includes a rotor core that has an upper surface and a lower surface, an edge plate that covers the upper surface or the lower surface, and a fixing member that fixes the edge plate to the rotor core, a plurality of refrigerant holes through which the refrigerant passes are formed in the rotor core, an opening that allows the plurality of refrigerant holes to communicate with the internal space and a fixing member opening through which the fixing member penetrates are formed in the edge plate, and a thickness portion is formed between the opening and the fixing member opening.

Abstract: An outer peripheral wall portion of an insulator has a plurality of slits that are formed to extend from one end in a direction of a central axis of the outer peripheral wall portion along the central axis and through which a winding wire drawn out from a winding portion is passed. The outer peripheral wall portion is formed with a connecting slit provided with a step portion by connecting two of the plurality of slits that are adjacent to each other in a circumferential direction of the outer peripheral wall portion, that extend from the one end, and that are different in depth.