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1. 发明专利

JP2002364568A OILLESS SCREW COMPRESSOR AND ITS CONTROLLING METHOD 失效
公开(公告)号：JP2002364568A
公开(公告)日：2002-12-18
申请号：JP2001166009
申请日：2001-06-01
申请人： HITACHI LTD
发明人： OTA HIROSHI , NISHIMURA HITOSHI , DOSONO KENJI
IPC分类号： F04C18/16 , F04C28/06 , F04C28/08 , F04C29/02 , F04C29/10
摘要： PROBLEM TO BE SOLVED: To provide an oilless screw compressor with a reduced power consumption when it is in the no-load operation or low-speed rotation. SOLUTION: The oilless screw compressor 100 comprises a low pressure stage compressor body 1 and a high pressure stage compressor body 2 and operates in two modes in reversals, i.e., a loaded operation in which the air is compressed in accordance with the change of the load and a non-load operation in which the air is released to the atmosphere or the like. The low pressure stage compressor body and high pressure stage compressor body are rotated by a motor 12 driven by an inverter 26 through gears 14, 11A, 11B. At starting or in the no-load operation, low-speed rotation, etc., part of the lubricating oil stored in the lower part of a gear case 3 and fed through an oil cooler 32 is returned to the gear case by opening an oil exhaust solenoid valve 35 installed on an oil supply piping 34B branched from an oil supply piping 34C.

2. 发明专利

JP2001227485A SCREW FLUID MACHINE 失效
公开(公告)号：JP2001227485A
公开(公告)日：2001-08-24
申请号：JP2000041390
申请日：2000-02-15
申请人： HITACHI LTD
发明人： MORI HIDETOMO , KAMETANI HIROCHIKA , NISHIMURA HITOSHI
IPC分类号： F04C18/16
摘要： PROBLEM TO BE SOLVED: To realize a screw rotor with a short working line. SOLUTION: A radius of curvature of a curve heading from a tooth root point of a female rotor for the rotational direction in operation gradually increases as the curve departs from the tooth root point, and its rate of increase gradually decreases. The radius of curvature finally shifts to a tendency to decrease after reaching its maximum value and heads for a pitch circle, and the screw rotor has a tooth profile curve such that a length extending from the tooth root point to the maximum point of the radius of curvature along the tooth profile curve is longer than a length extending from the maximum point of the radius of curvature to a pitch radius along the tooth profile curve.

3. 发明专利

JPH11141488A AIR-COOLED TWO-STAGE OIL-FREE SCREW COMPRESSOR 失效
公开(公告)号：JPH11141488A
公开(公告)日：1999-05-25
申请号：JP30541097
申请日：1997-11-07
申请人： HITACHI LTD
发明人： NISHIMURA HITOSHI , OTA HIROSHI , SUZUKI TOMOO
IPC分类号： F04C23/00 , F04B41/00 , F04C28/02 , F04C29/02 , F04C29/04 , F04C29/10
摘要： PROBLEM TO BE SOLVED: To provide an air-cooled two-stage oil-free screw compressor capable of miniaturizing a package and reducing noise. SOLUTION: In an air-cooled two-stage oil-free screw compressor provided with a low pressure stage compressor 5, a high pressure stage compressor 6, a main motor 9 driving each compressor 5, 6, an intercooler 13, an aftercooler 17, an oil cooler 22, a coolant cooler 28 and a cooling fan 32, each different suction port is provided and a pair of independent ventilating passages 35, 36 are provided. These ventilating passages 35, 36 are provided with a pair of each different suction port 37a, 37b, air sucked from the one suction port 37a is directed to a high temperature part of the intercooler 13 after air is passed the oil cooler 22 and air sucked from the other suction port 37b is directly directed to a low temperature part 13b of the intercooler 13.

4. 发明专利

JPH109176A OIL FREE SCREW COMPRESSOR 失效
公开(公告)号：JPH109176A
公开(公告)日：1998-01-13
申请号：JP16558196
申请日：1996-06-26
申请人： HITACHI LTD
发明人： NISHIMURA HITOSHI
IPC分类号： F04C18/16 , F04C27/00 , F04C29/02
摘要： PROBLEM TO BE SOLVED: To prevent oil from entering into a compression chamber by limiting an inflow rate of the oil to a shaft seal part after stopping the compressor. SOLUTION: A part of an oil supply piping 10 for supplying oil to a compressor body 1 is branched. Bypass pipings 12, 13 are led from the branch point and connected to a gear casing 5. A discharge oil solenoid valve 11 is arranged on the way of the bypass pipings 12, 13. The discharge oil solenoid valve 11 is a two-port valve which is closed when the compressor is operated and opened when the compressor is stopped.

5. 发明专利

JPH09195964A SHAFT SEAL STRUCTURE OF OIL FREE COMPRESSOR 失效
公开(公告)号：JPH09195964A
公开(公告)日：1997-07-29
申请号：JP980696
申请日：1996-01-24
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： OKAYA MASAKATSU , NISHIMURA HITOSHI
IPC分类号： F04C18/16 , F04C27/00 , F04C29/00 , F16J15/16
摘要： PROBLEM TO BE SOLVED: To prevent abrasion caused by contact with the seal ring of a carbon seal by forming a chamfering and a notching on a carbon seal end surface due to prevent interference of the carbon seal and the seal ring in a shaft seal mechanism. SOLUTION: Carbon seals 15a, 15b and sealings 16a, 16b are arranged in a suction side casing 9, and carbon seals 17a, 17b and sealings 18a, 18b are arranged in a casing 4, due to control an air rate which is leaked from a compression chamber to a shaft seal part. When screw rotors 5, 6 are rotated by applying driving force, the atmosphere is sucked from the suction port formed on the upper part of a compressor, and compressed air which is boosted into a prescribed pressure is discharged from a discharging port. A cha1mfering and a notching are formed on the other side of the carbon seals 15a, 15b, 17a, 17b or on both sides thereof, and thereby, influence of the sealings 16a, 16b, 18a, 18b is prevented. It is thus possible to improve abrasion resistance of the carbon seal remarkably.

6. 发明专利

JPH08189484A OIL SUPPLY DEVICE FOR OIL-FREE SCREW COMPRESSOR 失效
公开(公告)号：JPH08189484A
公开(公告)日：1996-07-23
申请号：JP102895
申请日：1995-01-09
申请人： HITACHI LTD
发明人： MORI HIDETOMO , OSADA YOSHIRO , NISHIMURA HITOSHI
IPC分类号： F04C18/16 , F04C29/02
摘要： PURPOSE: To enable oil supply without possibility of mixing into a compression chamber by arranging an oil supply nozzle which is opened to an accelerator and communicates with an oil header at a position of height between the oil header and a lower most oil supply nozzle. CONSTITUTION: When a compressor is stopped, an oil pump 6 is simultaneously stopped, for suspending oil supply to a low pressure stage compressor 1 and a high pressure stage compressor 2. Afterward, lubricating oil in each oil supply passage is returned in an oil header 9 by siphon function, and discharged into an accelerator 3 from an oil supply nozzle 35 provided on an upper portion of the oil header 9. Since the oil supply nozzle 35 is formed on an upper side of the oil header 9, however, the lubricating oil in the oil header is not discharged and held thereinside. Possibility of mixing of the lubricating oil into a compression chamber over the seal of a compressor body is eliminated. When the compressor is restarted, oil supply to a bearing and a gear is restarted only by filling the oil supply pipe 10 and the oil supply passages with the lubricating oil in the oil header 9.

7. 发明专利

JPH07217575A DELIVERY GAS PIPING FOR UNLUBRICATED SCREW COMPRESSOR 失效
公开(公告)号：JPH07217575A
公开(公告)日：1995-08-15
申请号：JP909494
申请日：1994-01-31
申请人： HITACHI LTD
发明人： OTA HIROSHI , AOKI MASAKAZU , NISHIMURA HITOSHI
IPC分类号： F04C29/12 , F04C29/00
摘要： PURPOSE:To perform free regulation of length and an angle in the directions of three axes x-z by a method wherein an exhaust gas pipe is divided into a plurality of straight pipe parts or bent pipe parts, a parallel male screw is formed on the end part of each of the division pipings, which are intercoupled through a joint provided at two ends with parallel female screws. CONSTITUTION:In a delivery gas piping through which the delivery gas outlet part of a device, such as a compressor body or a cooler, and a device, such as a cooler, or a compressor body inlet part are intercoupled, a piping 18 provided at end part with a right handed screw parallel male screw and a piping 19 provided at end part with a left handed screw parallel male screw are intercoupled through a coupling 28 provided at one end part with the right handed screw parallel female screw and at the other end part with a right handed screw female screw. Namely, lock nuts 22 and 23 are screwed in the respective end parts of the pipings 18 and 19 and by fastening the lock nuts 22 and 23, the pipings 18 and 19 and the coupling 28 are fixed. The pipings 18 and 19 are coated with a sealant, such as a bond, as a leakage preventing means. Parts 16 and 17 are formed in the same structure as that of a part 15 part and this constitution interconnects the pipings 18 and 21.

8. 发明专利

JPH0712070A UNLUBRICATED SCREW COMPRESSOR 失效
公开(公告)号：JPH0712070A
公开(公告)日：1995-01-17
申请号：JP15061693
申请日：1993-06-22
申请人： HITACHI LTD
发明人： AOKI MASAKAZU , NISHIMURA HITOSHI , MORI HIDETOMO , UCHIDA RIICHI
IPC分类号： F04C18/16
摘要： PURPOSE:To realize a small displacement unlubricated screw compressor without deteriorating efficiency as well as without deteriorating reliability and workability. CONSTITUTION:By shortening a section where a compression chamber formed of teeth grooves of a male rotor 1 and a female rotor 2 is sealed by an end surface with a suction side casing 10 in a compression stroke, and by shortening a rotor length more than a rotor length, a small displacement compressor is realized, and suction is started by delaying an opening position of a suction port. A liquid-cooled jacket for cooling is not provided in the casing.

9. 发明专利

JPH04362291A UNLUBRICATING TYPE SCREW COMPRESSOR 失效
公开(公告)号：JPH04362291A
公开(公告)日：1992-12-15
申请号：JP13754291
申请日：1991-06-10
申请人： HITACHI LTD
发明人： NISHIMURA HITOSHI
IPC分类号： F04C18/16
摘要： PURPOSE:To prolong the life of a bearing by fitting a slide bearing through a slight gap at the discharge side shaft edge which is contiguous to a timing gear, on the discharge sides of the female and male rotors, and reducing the radial gas load which acts on the cylindrical roller bearings for supporting the female and male rotors. CONSTITUTION:A plurality of timing gears 4 and 5 are fitted at the discharge side shaft edges of the female and male rotors 2 and 1 which are housed in a casing 3 and meshed each other, and female and male rotor lobe parts 7 and 6 revolve in noncontact form. In order to support the female and male rotors 2 and 1, a plurality of cylindrical roller bearings 9a and 9b are arranged in a suction side casing 8, and a plurality of other cylindrical roller bearings 10a and 10b and angular thrust bearings 11a and 11b are arranged in the casing 3. With this constitution, on one or both discharge sides of the female and male rotors 2 and 1, a plurality of slide bearings 16a and 16b are arranged through a slight gap 15, at each discharge side shaft edge which is contiguous to each of timing gear 4, and 5.

10. 发明专利

JP2003113784A FLUID MACHINE AND METHOD FOR MANUFACTURING ROTOR THEREOF 审中-公开
公开(公告)号：JP2003113784A
公开(公告)日：2003-04-18
申请号：JP2001307960
申请日：2001-10-03
申请人： HITACHI LTD
发明人： YAMAMOTO AKIHIKO , YOSHITOMI YUJI , NISHIMURA HITOSHI , KASAHARA MASAYUKI
IPC分类号： F04C18/16 , B22D19/00 , F04C29/00
摘要： PROBLEM TO BE SOLVED: To provide a rotor causing no fatigue cracking by extending a thin inter-metal compound produced at a joint part of an iron-based rotor shaft and an aluminum alloy rotor to avoid deterioration of strength, when manufacturing an aluminum alloy screw-type rotor by casting. SOLUTION: After aluminum or an aluminum alloy sleeve is fitted to the outer periphery of the iron-based rotor shaft, aluminum alloy casting is cast to obtain a thin joint part of inter-metal compound layers. After Cr is plated on the surface of the iron-based rotor shaft in advance and the aluminum or aluminum alloy sleeve is fitted, aluminum alloy casing is cast to obtain a thinner joint part of inter-metal compound layers.

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