公开(公告)号：JPH08136076A

公开(公告)日：1996-05-31

申请号：JP27128394

申请日：1994-11-04

Applicant: MATSUSHITA REFRIGERATION

Inventor： AOYAMA SHIGEO ,  KURAMOTO TETSUEI ,  TAKAO MOTOHARU

IPC: F25B13/00 ,  F25B1/00

Abstract: PURPOSE: To operate an optimum refrigerating cycle by suitably holding a pressure reduced amount for the changes of operating conditions and the length of a refrigerant tube for coupling an outdoor unit to an indoor unit. CONSTITUTION: A heat pump type air conditioner comprises a first temperature detector Th1 for detecting the outlet side tube temperature Tp1 of an outdoor pressure reducing capillary tube Exp1 at the time of cooling, a second temperature detector Th2 for detecting the outlet tube temperature Tp2 of an indoor heat exchanger 5, a first differential pressure calculator Cal1 for calculating the refrigerant pressure difference ΔP1 from the temperatures Tp1, Tp2, and a first expansion valve controller Cnt1 for controlling the opening of an indoor expansion valve Exp2 so that the difference ΔP1 falls within a predetermined range A.

公开(公告)号：JPH08189717A

公开(公告)日：1996-07-23

申请号：JP257295

申请日：1995-01-11

Applicant: MATSUSHITA REFRIGERATION

Inventor： KURAMOTO TETSUEI ,  AOYAMA SHIGEO ,  TAKAO MOTOHARU

IPC: F25B13/00

Abstract: PURPOSE: To permit operation under the optimum refrigerating cycle and permit the application of the operation in the case having a plurality of indoor units by a method wherein the amount of evacuation is retained optimally with respect to the change of the length of a refrigerant pipeline, connecting an outdoor unit to the indoor units, and the change of operating conditions. CONSTITUTION: An outdoor expansion valve Exp1 is installed in an outdoor unit A' and an indoor expansion valve Exp2 is installed in an indoor unit B' while a heat pump type air-conditioning machine is provided with an outdoor expansion valve controller Cnt1, controlling the opening degree of the outdoor expansion valve Exp1 so that a refrigerant pressure, detected by a third pressure sensor, becomes a predetermined refrigerant pressure for cooling upon cooling operation, and an indoor expansion valve controller Cnt2, controlling the opening degree of the indoor expansion valve Exp2 so that a refrigerant pressure, detected by a fourth pressure sensor, becomes a predetermined refrigerant pressure for heating upon heating operation.

公开(公告)号：JPH08166170A

公开(公告)日：1996-06-25

申请号：JP30739394

申请日：1994-12-12

Applicant: MATSUSHITA REFRIGERATION

Inventor： TAKAO MOTOHARU ,  AOYAMA SHIGEO ,  KURAMOTO TETSUEI

IPC: F25B1/00 ,  F25B13/00

Abstract: PURPOSE: To prevent lowering of an operation efficiency by reducing a heat loss due to absorption of heat from an atmosphere by refrigerant piping making an outdoor expansion valve communicate with an indoor expansion valve, at the time of a cooling operation. CONSTITUTION: In an air conditioner, an outdoor expansion valve Exp1 is provided in an outdoor unit A', and an atmosphere temperature detecting device Th1, piping temperature detecting device Th2 detecting the temperature of a first refrigerant piping 8a' and an expansion valve control device Cnt controlling the opening of the outdoor expansion valve Exp1 so that the temperature of the first refrigerant piping 8a' be the atmosphere temperature or above, are provided.

公开(公告)号：JPH09138016A

公开(公告)日：1997-05-27

申请号：JP29673795

申请日：1995-11-15

Applicant: MATSUSHITA REFRIGERATION

Inventor： AOYAMA SHIGEO ,  KURAMOTO TETSUEI ,  MACHIDA KAZUHIKO ,  TAKAO MOTOHARU

IPC: F25B1/00 ,  F25B13/00

Abstract: PROBLEM TO BE SOLVED: To recover refrigerant in a refrigerant recovery tank in a refrigerant recovery mode by an automatic operation by providing the tank in an outdoor unit. SOLUTION: A refrigerant tank Tnk is installed in a refrigerant tube in an outdoor unit A between an outdoor expansion valve Exp1 and an indoor expansion valve Exp2 via first two-way valve V1 and second two-way valve V2 in the heat pump type air conditioner, and suction pressure detecting means Prs for detecting the refrigerant pressure p1 of the suction side of a compressor 1 is installed. A refrigerant recovery controller cnt1 having a refrigerant recovery mode for closing the valve V2 and setting the outdoor blower 4 to the maximum mode and the indoor blower 8 to the maximum mode after the cooling operation is executed for a predetermined time τ and closing the valve V1 and stopping the compressor 1 when the suction pressure p1 becomes a predetermined pressure p0 or lower, and a refrigerant recovery operating unit Rmt are provided.

公开(公告)号：JPH09138008A

公开(公告)日：1997-05-27

申请号：JP29674295

申请日：1995-11-15

Applicant: MATSUSHITA REFRIGERATION

Inventor： TAKAO MOTOHARU ,  AOYAMA SHIGEO ,  KURAMOTO TETSUEI

IPC: F25B1/00 ,  F25B13/00

Abstract: PROBLEM TO BE SOLVED: To prevent the decrease in the operating efficiency of an air conditioner by preventing the defrosting of a hot-line tube existing in an outdoor side heat exchanger and coupling at both the ends to an outdoor expansion valve and an indoor side heat exchanger at the time of heating. SOLUTION: The air conditioner comprises an indoor expansion valve Exp2 installed in an outdoor unit B', a hot-line tube temperature detector Th1 existing in an outdoor heat exchanger 3 and detecting the tube temperature of a hot-line tube 9 coupled at both the ends to an outdoor expansion valve Exp1 and the vale Exp2, and an indoor expansion valve controller CNT for so controlling the opening of the valve Exp2 that the tube 9 falls within a predetermined temperature range at the time of heating.

公开(公告)号：JPH08303878A

公开(公告)日：1996-11-22

申请号：JP11425895

申请日：1995-05-12

Applicant: MATSUSHITA REFRIGERATION

Inventor： KURAMOTO TETSUEI ,  AOYAMA SHIGEO ,  TAKAO MOTOHARU

IPC: F25B1/00 ,  F25B13/00

Abstract: PURPOSE: To keep an amount of a refrigerant held in a refrigerant piping proper by a method wherein an outdoor expansion valve is closed by a specified opening when the dryness of the refrigerant is small while the degree of overheating the refrigerant is large and the outdoor expansion valve is opened by a specified opening when the dryness of the refrigerant is large while the degree of overheating the refrigerant is small. CONSTITUTION: An outdoor expansion valve Exp1 is closed by a specified opening by a first outdoor expansion valve controller GCnt1, when the dryness of a refrigerant on the outlet side of the outdoor expansion valve Exp1 is smaller than a specified value while the degree of overheating the refrigerant on the outlet side of a compressor 1 is larger than a specified range of the upper limit value continuously for more than a specified time length. The outdoor expansion valve Exp1 is opened by a specified opening by the first outdoor expansion valve controller GCnt1 when the dryness of the refrigerant on the outlet side of the outdoor expansion valve Exp1 is larger than the specified value while the degree of overheating the refrigerant on the outlet side of the compressor 1 is smaller than a specified range of the lower limit value continuously for more than a specified time length. This enables keeping of the amount of the refrigerant held proper during heat exchange in a refrigerating cycle thereby achieving a higher cooling operation efficiency.