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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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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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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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Patent Agency Ranking
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：JPH06147674A
公开(公告)日：1994-05-27
申请号：JP29688292
申请日：1992-11-06
Applicant: MATSUSHITA REFRIGERATION
Inventor： KITAYAMA HIROSHI , TAKATANI TAKAYUKI , KANEKO TAKASHI
Abstract: PURPOSE:To prevent a reduction in performance of a multi-chamber type air conditioner from being decreased due to a leakage of high pressure refrigerant toward a low pressure side during a heating operation by a method wherein a two-way valve for connecting one of a plurality of indoor heat exchangers of a plurality of indoor devices to either a high pressure gas pipe or a low pressure gas pipe in such a way that they may be changed over is applied as a two-way valve having a releasing hole for releasing from a high pressure side to a low pressure side. CONSTITUTION:At a multi-chamber type air conditioner, refrigerant discharged from a compressor 2 of an outdoor device 1 is guided to indoor heat exchangers 9 (9a to 9c) through high pressure two-way valves 20 (20a to 20c) in the indoor devices 7a to 7c, wherein the refrigerant liquified by an outdoor heat exchanger 4 is expanded, thereafter the refrigerant is fed to each of the indoor heat exchangers 9, evaporated there and then the refrigerant is returned to the outdoor device 1 through the low pressure side two-way valves 21 (21a to 21c). In this case, each of the two-way valves 20, 21 is made to have a releasing hole a minute flow rate of liquid is leaked from the high pressure side to the low pressure side. With such an arrangement, a pressure difference across the two-way valves 20 and 21 is reduced and then the high pressure refrigerant is prevented from being leaked to the low pressure gaseous refrigerant.
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公开(公告)号：JP2001329958A
公开(公告)日：2001-11-30
申请号：JP2000149402
申请日：2000-05-22
Applicant: MATSUSHITA REFRIGERATION
Inventor： KANEKO TAKASHI
Abstract: PROBLEM TO BE SOLVED: To appropriately control the oil quantities for plural compressors. SOLUTION: This system is provided with a constant-speed side oil returning main bypass 12 for communicating an oil exhaust port of a constant-speed side oil separator 6 with a suction collective tube 11. The oil is fed from the constant-speed side oil separator 6 to a variable-speed compressor 1 to prevent the shortage of the oil quantity when the variable-speed compressor 1 is operated at a high speed.
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公开(公告)号：JP2001132645A
公开(公告)日：2001-05-18
申请号：JP32055099
申请日：1999-11-11
Applicant: MATSUSHITA REFRIGERATION
Inventor： OGAWA MITSUO , KANEKO TAKASHI , KITAYAMA HIROSHI , MORIWAKI SHUNJI
Abstract: PROBLEM TO BE SOLVED: To regulate quantities of oil for plural low pressure shell type compressors to a proper ones. SOLUTION: A variable speed side oil equalizing branch pipe 4 having one end in communication with the vicinity of the standard oil level of a variable speed compressor 1 and another end in communication with an oil equalizing pipe 3 is provided, a constant speed side oil equalizing branch pipe 5 having one end in communication with the vicinity of the standard oil level of a constant speed compressor 2 and another end in communication with the oil equalizing pipe 3 is provided, and a variable speed side two-way valve 6 is provided in the middle of the variable speed side oil equalizing branch pipe 4. Thereby, shortage of oil in each compressor is prevented by closing the variable speed side two-way valve 6 during cooling or heating operation, and opening it during oil equalizing operation.
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公开(公告)号：JP2000088370A
公开(公告)日：2000-03-31
申请号：JP25655098
申请日：1998-09-10
Applicant: MATSUSHITA REFRIGERATION
Inventor： KANEKO TAKASHI , KITAYAMA HIROSHI , OGAWA MITSUO , EGUCHI HIROAKI , MORIWAKI SHUNJI
IPC: F25B1/00
Abstract: PROBLEM TO BE SOLVED: To control an oil amount of a compressor to a suitable amount even in the case of different capacities of two compressors of a low pressure shell type. SOLUTION: The oil equalizing system for plural compressors communicates at one end with the vicinity of a standard oil level of a shell of a low capacity side compressor 2 and at the other end with high capacity side suction control tube piping. The system comprises an oil equalizing bypass 5 having a two-way valve 6 on the way of both the ends. The system stops the compressor 2 for a predetermined period when an integrated time of the two compressors arrives at an upper limit integrated time, and opens the valve 6 to prevent an oil amount insufficiency of the compressors.
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