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公开(公告)号：CA2217514A1
公开(公告)日：1998-04-28
申请号：CA2217514
申请日：1997-10-06
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKATANI KAZUO , KURACHI MASAO , KANEKO TAKASHI , KUSAKA MICHIYOSHI
Abstract: The present invention is directed to air conditioning equipment provided with an oil level equalizing system, which includes a plurality of low-pressure shell-type compressors communicating with a suction line through a plurality of branch portions, a plurality of connecting lines each communicating with a correspondin g compressor shell at a location adjacent to a normal oil level in the shell, and an oil level equalizing line communicating with the plurality of connecting lines. The oil level equalizing system also includes a communication line, through which the su ction line communicates with the oil level equalizing line at a location upstream of t he plurality of branch portions with respect to a direction of flow of a refrigeran t, for increasing the pressure within the oil level equalizing line to a value higher t han that within the shell of each compressor. A gas/liquid separator for separating a gas refrigerant and a liquid refrigerant or an oil/gas separator for separating oil from the gas refrigerant may be provided in the suction line upstream of the plurality of branch portions. Alternatively, an accumulator may be provided.
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2.发明公开
公开(公告)号：EP1094100A4
公开(公告)日：2002-10-16
申请号：EP00915341
申请日：2000-04-05
Applicant: MATSUSHITA REFRIGERATION
Inventor： KURACHI MASAO , NAKAGAWA NOBUHIRO , TAKAICHI KENJI , SAKAI HISAKAZU , NOZUE AKIHIRO
IPC: C09K5/04 , F25B9/00 , F25B31/00 , F25B43/00 , C10M103/00 , C10M105/02 , F25B1/00
CPC classification number: F25B9/006 , C09K5/042 , C09K2205/132 , F25B31/002 , F25B43/003 , F25B2400/12 , F25B2500/222
Abstract: In a refrigerant compression type refrigerating system for use in the field of refrigerating/air conditioning employing a hydrocarbon refrigerant containing an odorant, the concentration of the odorant at the time of refrigerant leakage is kept on a sensible level. The refrigerant composition contains at least one ingredient selected among ethane, propane, cyclopropane, propylene, and isobutane. It contains ammonia in an amount of 1 to 60 wt. %, preferably 1 to 20 wt. %, as an odorant.
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公开(公告)号：JP2002115941A
公开(公告)日：2002-04-19
申请号：JP2000311600
申请日：2000-10-12
Applicant: MATSUSHITA REFRIGERATION
Inventor： KURACHI MASAO
Abstract: PROBLEM TO BE SOLVED: To provide a cooling apparatus which ensures safety by preventing combustible refrigerant, which is employed as refrigerant for a refrigerating cycle, from igniting when external pressure is imposed. SOLUTION: A main body 1 of a cooling and heating vending machine has a structure wherein the combustible refrigerant of a hydrocarbon base is enclosed in the refrigerating cycle in which a compressor 10, a condenser 11, an evaporator 6 and the like are connected through piping. The main body 1 is provided with an impact sensor 13 for outputting signals for switching off a main power source upon imposition of a given external pressure, and a hydrocarbon sensor 14 for switching off a heater in the main body 1 by detecting leakage of the combustible refrigerant in the main body 1. Thus the cooling and heating vending machine is prevented from explosion caused by the combustible refrigerant.
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公开(公告)号：JP2002098427A
公开(公告)日：2002-04-05
申请号：JP2000288371
申请日：2000-09-22
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKATANI KAZUO , TAKATANI TAKAYUKI , KUSAKA MICHIYOSHI , KURACHI MASAO
IPC: F25B1/00
Abstract: PROBLEM TO BE SOLVED: To eliminate the difficulty with the prior art, where a piping arrangement in an outdoor machine is complicated in order to accommodate parts used for composition control, and where an outdoor machine box structure is large-sized, and further provide a changeover apparatus capable of simply changing over an ordinary heat pump apparatus and a heat pump apparatus of which the capability is controllable. SOLUTION: A composition adjusting apparatus 25 is provided, constructed integrally in the interior of a different box from that of an outdoor machine 21, in which a non-azeotropic refrigerant in encapsulated. Connection pipings are adapted to be demountable in opening/closing valves 28, 29 provided in the outdoor machine for connecting the composition control apparatus 25 and the outdoor machine 21. Further, signal lines 30, 31 for driving a solenoid valve for operation of the composition control apparatus are also constituted demountably on an electronic board of the outdoor machine 21.
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公开(公告)号：JPH1182344A
公开(公告)日：1999-03-26
申请号：JP24807197
申请日：1997-09-12
Applicant: MATSUSHITA REFRIGERATION
Inventor： KANEKO TAKASHI , KURACHI MASAO , NAKATANI KAZUO , KUSAKA MICHIYOSHI
Abstract: PROBLEM TO BE SOLVED: To control oil amount for each compressor to a proper amount even through a compressor of different capacity is included in a plurality of compressors, or even through a variable capacity type compressor is included in the plurality of compressors. SOLUTION: This oil equalizing system for a plurality of compressors, comprises the oil equalizing pipe connection pipings 2a, 2b, 2c (2), near the height of a reference oil face of a shell of each compressor 1a, 1b, 1c (1), and an oil equalizing pipe 3 communicated with one edges of the oil equalizing tube connection pipings 2, a communication pipe 6 for communicating an upstream side of the inlet branch parts 4a, 4b to each compressor 1, with the oil equalizing pipe 3, and making the pressure of the oil equalizing pipe 3 higher than that in the shell of each compressor 1, and an oil equalizing by-pass 7 for connecting the neighborhood of the height of the reference oil face of the shell of the compressor 1b, 1c, with the inlet piping 5a of the compressor 1a, and having a restrictor. Whereby the movement of the oil through the oil equalizing pipe 3 can be prevented.
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Patent Agency Ranking
公开(公告)号：JPH1163691A
公开(公告)日：1999-03-05
申请号：JP22464197
申请日：1997-08-21
Applicant: MATSUSHITA REFRIGERATION
Inventor： KANEKO TAKASHI , KURACHI MASAO , NAKATANI KAZUO , KUSAKA MICHIYOSHI
IPC: F25B1/00
Abstract: PROBLEM TO BE SOLVED: To prevent oil amount insufficiency of a compressor of a low capacity side, by communicating one end of an oil equalizing bypass with the vicinity of standard oil level height of a shell of partial compressor, communicating many ends with a suction pipe of the other compressor, and providing a throttle on the way of the both ends. SOLUTION: Oil equalizing tube connecting pipes 2a to 2c are provided near standard oil level height of shells of a plurality of compressors 1a to 1c. An oil equalizing tube 3 communicates with one ends of the pipes 2a to 2c. A vapor liquid separator 6 having a gas refrigerant exhaust port 7 for exhausting only gas refrigerant is provided at a suction pipe 5a of an upstream side from suction branch parts 4a, 4b of the compressors 1a to 1c. One end of an oil equalizing bypass 9 closely communicates with standard oil level height of the shells of the partial compressors 1b, 1c. Many ends communicate with the pipe 5a of the other compressor 1a, and a throttle is formed on the way of the both ends. Thus, oil amount insufficiency of the compressor of low capacity side can be prevented.
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公开(公告)号：JPH10132397A
公开(公告)日：1998-05-22
申请号：JP28486296
申请日：1996-10-28
Applicant: MATSUSHITA REFRIGERATION
Inventor： KANEKO TAKASHI , KURACHI MASAO , NAKATANI KAZUO , KUSAKA MICHIYOSHI
IPC: F25B1/00
Abstract: PROBLEM TO BE SOLVED: To enable a proper amount of oil in each of compressors to be adjusted even in the case that as a plurality of compressors, compressors having different capacities are included or in the case that as a plurality of compressors, compressors of variable volumetric type are included. SOLUTION: Mean oil pipe connecting tubes 12 are arranged near a height of a standard oil surface of a shell of each of compressors 2. There are provided a oil equalizing pipe 11 communicating with one end of each of mean oil connecting tubes 12, a suction gas pipe 9 at an upstream side of the suction gas branch section 10 for each of the compressors 2 and a communicating pipe 13 communicating with the oil equalizing pipe 11, thereby a pressure in the oil equalizing pipe 11 is set to be higher than a pressure within the shell of each of the compressor 2 and then during the operation of the compressor 2, oil is prevented from being moved through the oil equalizing pipe.
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公开(公告)号：JPH0828986A
公开(公告)日：1996-02-02
申请号：JP16404294
申请日：1994-07-15
Applicant: MATSUSHITA REFRIGERATION
Inventor： MARUMOTO KAZUHIKO , KURACHI MASAO , KITAYAMA HIROSHI , KANEKO TAKASHI
Abstract: PURPOSE:To avoid a dangerous possibility reaching up to a liquid compression caused by returning of liquid to a compressor, perform a proper capability control of an indoor machine and provide a comfortable cooling by a method wherein a degree of over-heating is calculated more accurately during cooling operation and an indoor side expansion valve is controlled in a multi-room type cooling or heating device using non-azeotropic mixture refrigerant. CONSTITUTION:This multi-room type cooling and heating device comprises expansion valve temperature sensors 17a, 17b; liquid pipe temperature sensing sensors 10a, 10b; gas pipe temperature sensing sensors 11a, 11b; saturation gas temperature calculating means 13a''' and 13b''' for calculating saturation gas temperature; over-heating degree calculating means 14a''' and 14b''' for calculating an over-heating degree; and indoor expansion valve operating means 15a, 15b for operating indoor expansion valves 8a, 8b.
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公开(公告)号：JPH07174425A
公开(公告)日：1995-07-14
申请号：JP31965193
申请日：1993-12-20
Applicant: MATSUSHITA REFRIGERATION
Inventor： KURACHI MASAO , KITAYAMA HIROSHI , MARUMOTO KAZUHIKO , KANEKO TAKASHI
IPC: F25B13/00
Abstract: PURPOSE:To ensure cooling capacity and heating capacity through simple structure without lowering efficiency in relation to a freezing cycle in which a non- azeotropic refrigerant is used. CONSTITUTION:First outdoor refrigerant circuits 15a and 15c wherein the flow of the refrigerant of a heat-exchanger 15 on the outdoor side forms a reverse flow to the flow of the refrigerant of a heat-exchanger 15 on the outdoor side during cooling operation and a parallel flow thereto during heating operation and second outdoor refrigerant circuits 15b and 15d wherein the outdoor flow forms a parallel flow thereto during cooling operation and a reverse flow thereto during heating operation are arranged in a mixed state.
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公开(公告)号：JPH06337152A
公开(公告)日：1994-12-06
申请号：JP12571793
申请日：1993-05-27
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKAGAWA NOBUHIRO , KURACHI MASAO
Abstract: PURPOSE:To provide a multiroom cooling/heating device which prevents the operation of protecting the discharge pressure by suppressing the increase of the discharge pressure during cooling overload operation and provides a given cooling capacity during a summer season when cooling is needed most. CONSTITUTION:A multiroom cooling/heating device comprises a refrigerant cycle on the heat source side wherein a compressor 1, a four-way valve 2, a heat-exchanger 4 on the heat source side, a pressure reducing device 5, a first auxiliary heat-exchanger 6, and a third auxiliary heat-exchanger 3 are circularly interconnected; and a refrigerant cycle on the first utilization side wherein a second auxiliary heat-exchanger 7 formed integrally with the first auxiliary heat-exchanger 6 to perform heat-exchange, a first refrigerant conveying device 8, and heat-exchangers 12a and 12b on the first utilization side are circularly interconnected. Further, the multiroom cooling/heating device is provided with a refrigerant cycle on the second utilization side wherein a fourth auxiliary heat-exchanger 9 formed integrally with a third auxiliary heat- exchanger 3, a second refrigerant conveying device 10, and heat-exchangers 16a and 16b on the second utilization side, are circularly interconnected, an operation mode detecting means 21, a pressure detecting means 22, a cooling overload deciding means 23, and an actuator drive means 24.
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