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1. 发明专利

JPH11230642A MULTIPLE AIR CONDITIONER 失效
公开(公告)号：JPH11230642A
公开(公告)日：1999-08-27
申请号：JP3450498
申请日：1998-02-17
申请人： HITACHI LTD , HITACHI SHIMIZU ENG CO LTD
发明人： MATSUSHIMA HITOSHI , MICHIHASHI HIROSHI , IGARASHI YASUYUKI , TOGUSA KENJI
IPC分类号： F25B13/00 , F25B41/00 , F25B41/04
摘要： PROBLEM TO BE SOLVED: To perform refrigerant equalization and oil equalization among several outdoor units, by constituting a divider of a main pipe inserted to be vertical with a hearer part and a plurality of branch pipes inserted into a header part on opposite side from the main pipe, and besides, providing neither the main pipe nor the branch pipe with a throttle. SOLUTION: A divider 5 is composed of a cylindrical header part 7 whose tubular axis is roughtly parallel to the floor face, a main pipe 8 which is inserted into the center of the header part 7 so that it may be vertical to the header part 7, and four pieces of branch pipes 9 which are symmetrical to the tubular axis of the main pipe 8 and are inserted into the header part 7 on opposite side from the main pipe 8. Moreover, the main pipe 8 is inserted to have enough opening area, with its tip 8 in rough contact with the tubular wall of the header part 7 on the side of the branch pipe 9. Furthermore, the main pipe 8 is connected to a gas pipe or a liquid pipe, and the branch pipe 9 is connected to the refrigerant pipe from each outdoor unit, and neither the main pipe 8 nor the branch pipe 9 is provided with a throttle.

2. 发明专利

JPH1183223A AIR CONDITIONER 失效
公开(公告)号：JPH1183223A
公开(公告)日：1999-03-26
申请号：JP24796397
申请日：1997-09-12
申请人： HITACHI LTD
发明人： MICHIHASHI HIROSHI , TOGUSA KENJI , IGARASHI YASUYUKI
IPC分类号： F25B1/00 , F25B13/00
摘要： PROBLEM TO BE SOLVED: To prevent liquid seal in an oil equalizing pipe which transfers a compressor lubricating oil between outdoor units in a multi-type air-conditioning system. SOLUTION: An air-conditioning system which is constructed of a plurality of outdoor units A and B each equipped with compressors 1, an oil separator 3, a four-way valve 4, an outdoor heat exchanger 2, a thermal expansion valve 5, etc., a plurality of indoor units A and B each equipped with an expansion valve 10, an indoor heat exchanger 8, etc., a common liquid pipe 19 and a common gas pipe 20 connecting an outdoor unit group and an indoor unit group and an oil equalizing pipe 18 connecting the oil separators 3 of the outdoor units through the intermediary of valves and wherein a control to transfer oil through the oil equalizing pipe 18 is conducted. The valve of the oil separator 3 of the outdoor unit A is made a control valve 15 which opens and closes forcedly for a flow in the forward direction from A to B and opens and closes according to a difference between the pressure inside the oil equalizing pipe 18 and that inside the oil separator 3 on the A side for a flow in the reverse direction, while the valve of the oil separator 3 of the outdoor unit B is made an on-off valve 21 which opens and closes forcedly.

3. 发明专利

JPH10300245A AIR CONDITIONER 失效
公开(公告)号：JPH10300245A
公开(公告)日：1998-11-13
申请号：JP10572597
申请日：1997-04-23
申请人： HITACHI LTD , HITACHI SHIMIZU ENG KK
发明人： IGARASHI YASUYUKI , TOGUSA KENJI , MICHIHASHI HIROSHI , MATSUSHIMA HITOSHI
IPC分类号： F25B1/00
摘要： PROBLEM TO BE SOLVED: To obtain an air conditioner for enhancing reliability of a compressor by stopping the compressor, then lowering a differential pressure before and after the compressor in a short time, and holding an oil supply amount of the compressor at a suitable value. SOLUTION: The air conditioner comprises an indoor unit and a plurality of outdoor units, and bypass tubes 13 (13A, 13B) connecting a discharge side of a compressor 1 (1AA, 1AB, 1BA, 1BB) provided at the outdoor unit to a suction side of the compressor 1. In this case, the conditioner also comprises an oil separator 3 (3A, 3B) connected to a discharge side of the compressor 1, a check valve 14 (14A, 14B) provided at a downstream side of the separator 3, and a bypass tube 13 (13A, 13B) connected between the separator 3 and the valve 14.

4. 发明专利

JPH1183249A OIL LEVEL DETECTOR FOR COMPRESSOR 失效
公开(公告)号：JPH1183249A
公开(公告)日：1999-03-26
申请号：JP24649297
申请日：1997-09-11
申请人： HITACHI LTD
发明人： MICHIHASHI HIROSHI , TOGUSA KENJI , IGARASHI YASUYUKI
IPC分类号： F25B1/00 , F25B49/02
摘要： PROBLEM TO BE SOLVED: To detect an oil level accurately by matching the height of an oil conduction pipe with the height of the working point of an oil level detecting means in an oil level detector. SOLUTION: A float type oil level detector 11 coupled with an oil separator 10 is provided with a pressure equalizing conduction pipe 1 and an oil moving conduction pipe 9 wherein the height of the oil conduction pipe 9 is matched with the height of working point A of a float switch in the oil level detector 11. Even if the oil level in the oil separator 10 is different from that in the oil level detector 11, they are conducted through a gas-liquid two phase in the conduction pipe 9 in the vicinity of the working point A. Consequently, the oil moves from a high oil level toward a low oil level and the oil levels are eventually matched thus ensuring accurate operation at the working point A. This system is applicable to a case for detecting and controlling the liquid level in an L tank, or the like.

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