Mitsubishi Heavy Industries Thermal Systems Patente

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Provided is a compressor capable of suppressing disproportionation reaction of HFO refrigerant as much as possible. A compressor (1D) comprises: a housing (2D) in which a refrigerant flows; a rotary compression mechanism (6A) that is provided inside the housing (2D) and compresses the refrigerant; and an electric motor (5D) that is provided inside the housing (2D) and drives the rotary compression mechanism (6A). The refrigerant is an HFO refrigerant containing R1123 or R1132 (E) or a mixed refrigerant containing the HFO refrigerant, and a pressure of a motor space (S4) containing a winding (53D) of the electric motor (5D) is set to 6 MPa or less. The rotary compression mechanism (6A) sucks the refrigerant from the motor space (S4), compresses the refrigerant, and then discharges the refrigerant to the outside of the housing (2D).

A control device for an air conditioning device comprises: a reception unit that receives an operation stop command; a reading unit that reads an outside air temperature, an enclosed refrigerant amount, and a predetermined refrigerant amount threshold when the operation stop command is received; a refrigerant amount acquisition unit that acquires an indoor-side refrigerant amount for each elapsed time on the basis of a table including a time from a predetermined operation stop and a ratio of a predicted value of the indoor-side refrigerant amount when the time elapses; a comparison unit that compares the indoor-side refrigerant amount with the refrigerant amount threshold; and a determination unit that determines whether to perform a cooling operation for transferring the refrigerant remaining on the indoor heat exchanger side to the outdoor heat exchanger side on the basis of a result of comparison performed by the comparison unit.

The present invention provides a compressor and a compressor production method which make it possible to reduce a thrust load that is produced by the weight of a rotary shaft. The present invention comprises a rotary shaft (30) that drives a compression mechanism (20) by rotating about a central axis (X) which extends in the vertical direction, and an oil supply pump (60) that is provided below the rotary shaft (30) and that discharges lubricating oil toward a lower end of the rotary shaft (30), wherein the rotary shaft (30) has a lubricating oil flow path (42, 44a, 51a) that guides, upward from the lower end thereof, the lubricating oil discharged from oil supply pump (60); and the lubricating oil flow path (42, 44a, 51a) is provided with at least one orifice throttle (51b) that imparts a pressure loss to the lubricating oil flowing therethrough.

An indoor unit of the present disclosure includes a casing (1) having arm accommodation portions (52) recessed backward from a front surface (51), arms (8) each having arm main body (80) inserted to the arm accommodation portion (52) from the front and shaft portion (81) protruding in a width direction from back end of the arm main body (80), and an inlet panel (9) which is fixed to front ends of the arm main bodies (80) and covering the front surface (51) of the casing (1). The arm accommodation portions (52) each have upper and lower guide portions configured to guide the shaft portion (81) backward through an opening of the arm accommodation portion (52) in a manner of being sandwiched therebetween from above and below, a bearing portion that is provided on a back end side thereof and is able to hold the shaft portion (81) to be rotatable about an axis extending in the width direction, and a stepped portion that is provided between the upper guide portion and the bearing portion and has a stepped surface directed to a backward side. The arms (8) each further have a stopper (84) that abuts the stepped surface so as to restrict turning of the shaft portion (81) when the shaft portion (81) turns in a state in which the shaft portion (81) is positioned in front of the bearing portion.

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This air conditioning system comprises: an outdoor unit; a plurality of indoor units that are each provided with a heat exchanger connected to the outdoor unit via a medium circuit through which a heat medium flows, and that each exchange heat between indoor air and the heat medium which is supplied from a compressor via the medium circuit; an outdoor temperature sensor that detects the outdoor temperature where the outdoor unit is installed; an outdoor unit control device that controls operation of the outdoor unit; and indoor unit control devices that are provided to the plurality of indoor units and that control the operation of the indoor units in accordance with set temperatures which are set externally. The outdoor unit control device includes a setting unit that, on the basis of correlation information which indicates a correlation of a reference pressure saturation temperature and outdoor temperatures and which is set in advance, acquires, as a reference pressure saturation temperature, a pressure saturation temperature corresponding to the outdoor temperature detected by the outdoor temperature sensor, and that, on the basis of the acquired reference pressure saturation temperature, sets a target pressure saturation temperature for adjusting output of the compressor.

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This evaluation device comprises: an extraction unit that extracts, from time-series data obtained by measuring the temperature of a control target of a heat source device, an element included in a monitoring section from a prescribed start condition to an end condition of temperature control; an estimation unit that, on the basis of the extracted element, estimates a dead time estimation value of a response of the temperature with respect to the temperature control and a time constant estimation value of a first-order lag response; and an evaluation unit that creates evaluation information about the heat source device based on at least one of the dead time estimation value and the time constant estimation value.

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The objective of the present invention is to improve the workability of work for installing a vibration isolating member. A vibration isolating member (20) is attached to an outdoor unit (2) that includes a compressing device (10) for compressing a refrigerant, and a separating wall (3g) disposed adjacent to the compressing device (10). The vibration isolating member (20) comprises: a vibration suppressing unit (30) which suppresses vibration of the compressing device (10), and which has a right side surface facing portion that extends in the front-rear direction, is provided in a gap formed between the compressing device (10) and the separating wall (3g), and faces a side surface of the compressing device (10), and a right front surface facing portion that extends in the left-right direction intersecting the front-rear direction and faces the front surface of the compressing device (10); and a support unit (40) which supports the vibration suppressing unit (30) from below.

The purpose of the present invention is to reduce a noise that is caused by the flow of a refrigerant. This air conditioner is provided with: a compressor that compresses a refrigerant; a heat exchanger (9) that exchanges heat between the refrigerant and another medium; an expansion valve that expands the refrigerant; a supercooling heat exchanger (20) that supercools the refrigerant; and refrigerant supply lines (30, 40) that supply the refrigerant to the supercooling heat exchanger (20). The refrigerant supply lines (30, 40) has: branch pipes (32) which cause the refrigerant to branch into a plurality of branch parts; first turbulence inhibition pipes (33, 43) each having one end connected to one of the plurality of branch parts; and second turbulence inhibition pipes (34, 44) each having one end connected to one of the plurality of branch parts. The other ends of the first turbulence inhibition pipes (33, 43) and the second turbulence inhibition pipes (34, 44) are connected to the supercooling heat exchanger (20).

This control device comprises: an extraction unit that extracts, from time-series data obtained by measuring the indoor temperature of a space to be air-conditioned, an element included in a monitoring section from a predetermined start condition to a predetermined end condition of air-conditioning control by an air conditioner; a division unit that uses, as an element of a primary delay response, an element after a point at which the indoor temperature starts falling in the monitoring section during a cooling operation and an element after a point at which the indoor temperature starts rising in the monitoring section during a heating operation, and divides elements other than the elements of the primary delay response in the monitoring section as elements of a dead time; and an estimation unit that estimates the length of the dead time as a dead time estimation value, and estimates a time constant estimation value at which a curve approximation error from the indoor temperature in the primary delay response is minimized.

This air-conditioning device compares a first operation valve provided between a compressor and an indoor heat exchanger on a gas pipe, a second operation valve provided between the expansion valve and the indoor heat exchanger on a liquid pipe, a first temperature measurement unit for measuring the temperature of the indoor heat exchanger, a second temperature measurement unit for measuring the temperature of an outdoor heat exchanger, a third temperature measurement unit for measuring the indoor temperature, a fourth temperature measurement unit for measuring the outdoor temperature, and a control device. The control device has an operation determination unit, a first comparison unit for comparing the outdoor temperature with the temperature of the outdoor heat exchanger in the case of a cooling operation, and a first determination unit for determining the state of each device when the temperature of the outdoor heat exchanger is lower than the outdoor temperature.

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a cylindrical housing (11) extending in an axial direction (Da) and in which an opening (19) is formed in a side wall surface of the housing (11); a suction pipe (18) which allows a refrigerant to be suctioned into the housing (11); and a discharging pipe (50) which allows the refrigerant compressed by a scroll compression unit (30) in the housing (11) to be discharged to the outside of the housing (11). The discharging pipe (50) includes a discharging pipe main body (51) having a linear shape passing through the opening (19) so as to be extended in a radial direction (Dr) outward the housing (11) from an inside thereof. An inner peripheral surface of the opening (19) is separated from an opening facing portion (51d) facing the inner peripheral surface in an outer peripheral surface of the discharging pipe main body (51).

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Provided is a freezing device (1) that can improve thermal efficiency even in a low outside air temperature and obtain necessary freezing performance. The freezing device includes: a compressor (3) configured to compress a CO<2> refrigerant; a gas cooler (5) configured to cool a CO<2> refrigerant discharged from the compressor (3); and a control unit configured to set a high-pressure target value of the CO<2> refrigerant so that the CO<2> refrigerant in the gas cooler (5) becomes subcritical and perform subcritical control when an outside air temperature is less than a first predetermined temperature, which is lower than the critical point of the CO<2> refrigerant, and a target evaporation temperature in an evaporator to which the CO<2> refrigerant cooled by the gas cooler (5) is guided via an expansion valve (7) is less than or equal to a second predetermined temperature.

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