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21. 发明专利

JPH06257595A CENTRIFUGAL FAN AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH06257595A
公开(公告)日：1994-09-13
申请号：JP4485593
申请日：1993-03-05
申请人： HITACHI LTD
发明人： TAKADA YOSHIHIRO , SHIMOIDE SHINICHI , NISHIDA HIDEO , OHASHI SHIGEO , TAKANO YASUSHI , YOSHINAGA SHINYA , SEKINE YOJI , SUZUKI KENJI , HASEGAWA KENGO , ASABUKI HIROSHI , NAGAI MAKOTO , TOYAMA YUJI
IPC分类号： F04D29/30 , F24F1/00 , F24F1/38 , F24F5/00
摘要： PURPOSE:To provide a thinned, noise-reduced centrifugal fan at reduced cost that provides a large quantity of air, for use in an air conditioner, air-cooled electronic equipment or an electric motor. CONSTITUTION:The bore of a side plate 3 is smaller than the outside diameter of a core plate 1 and a plurality of main vanes 2 are disposed at almost equal intervals on the core plate 1 and a plurality of auxiliary vanes 4 are mounted at almost equal intervals on that side of the side plate 3 which is opposite to the main vanes 2. The shapes of the main vane 2 and the auxiliary vane 4 are determined so that the main vane 2 and the auxiliary vane 4 are axially passed through respective trimming dies used in the manufacture of the main and auxiliary vanes. Therefore the centrifugal fan can provide low noise, high pressure and a large quantity of air as compared to conventional centrifugal and propeller fans and can be integrally molded and is therefore available at reduced cost.

22. 发明专利

JPH05223280A AIR CLEANER 失效
公开(公告)号：JPH05223280A
公开(公告)日：1993-08-31
申请号：JP2531292
申请日：1992-02-12
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： YOSHITOMI TATSUO , TOYAMA YUJI , TERANO MASAYUKI , HONMA KEIICHI
IPC分类号： F24F3/00 , F24F3/16 , F24F7/06
摘要： PURPOSE:To inexpensively provide an air cleaner adapted to reduce a thermal load to an air conditioner facility of a clean room, to reduce noise and to perform energy conservation by efficiently discharging heat of a motor for a blower by a simple housing structure. CONSTITUTION:Pressurized air by a blower 4 is fed from a pressure chamber 14 of an air purifying unit 7 through a filter 6 in a clean room 17. A motor partition wall 10 for partitioning at least a heat generation part of a motor 5 for driving the blower 4 and the chamber 14 is provided. A space in the wall 10 communicates with the chamber 14 by a communication tube, and the space in the wall 10 communicates with the exterior of the room by an exhaust tube 11.

23. 发明专利

JPH04161740A AIR CLEANING SYSTEM 失效
公开(公告)号：JPH04161740A
公开(公告)日：1992-06-05
申请号：JP28428990
申请日：1990-10-24
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： YOSHITOMI TATSUO , TOYAMA YUJI , HONMA KEIICHI , SAIKI ATSUSHI
IPC分类号： F24F7/06
摘要： PURPOSE:To improve maintenance and clean degree of a goods treating zone by providing a first air path to supply clean air to the goods treating zone and a second air path to supply clean air to a workers' zone and arranging the first path apart from the second air path. CONSTITUTION:A filter 3 is provided in a ceiling part of a goods treating zone 20 and a first fan means 102 having a motor 24 and an impeller 25 is arranged above the filter 3, so that air in the goods treating zone 20 flows out into a return air passage 32 through a space surrounded by an underfloor partition 18. A partition 27 is provided on a side which faces the return air passage 32 of the goods treating zone 20 for partitioning the goods treating zone 20 from the return air passage 32 to prevent dropdown of degree of cleanness in the goods treating zone 20. The filter 3 is provided upward of a working zone 21, and above this, a second fan means 202 having a motor 24 and an impeller 25 is arranged so that air diffused from the filter 3 flows out into a space between a floor surface of a building 1 and a floor 10. This air returns to the second fan means 202 through a return air passage 32 for the working zone.

24. 发明专利

JPH03271645A AIR PURIFYING SYSTEM 失效
公开(公告)号：JPH03271645A
公开(公告)日：1991-12-03
申请号：JP6964390
申请日：1990-03-22
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： YOSHITOMI TATSUO , TOYAMA YUJI , HONMA KEIICHI
IPC分类号： F24F7/06
摘要： PURPOSE:To prevent dust which generates at the time of maintenance from entering a clean room by constituting blower of which maintenance frequency is higher than that of a filter in such a manner that maintenance of the blower can be performed outside of the passage of purified air. CONSTITUTION:An impeller 4 of a blower 8 is contained in a fan case 8c in an air passage, and a main body 3b of a motor 3 is provided on the outside of the fan case 8c. When the motor for blower 3 is replaced, a supply air volume adjusting damper 6, return air volume adjusting damper 5 and total air volume adjusting damper 7 are totally closed, and air passages on the upstream side and downstream side of the blower 8 are shut off, and therefore, even when the blower 8 is dismounted, a purified area 30 and maintenance area 13 can be separated. For this reason, non-purified air in the maintenance area 13 can be prevented from entering the purified area 30, and at the same time, even when dust which adheres on the primary side of a HEPA filter 1 re-flies, the dust does not enter a clean room 11 and a return system part 12 of the clean room, and therefore, the purifying degree of the purified area 30 does not decrease.

25. 发明专利

JP2000296306A FINE FILTER UNIT 失效
公开(公告)号：JP2000296306A
公开(公告)日：2000-10-24
申请号：JP10622099
申请日：1999-04-14
申请人： HITACHI LTD
发明人： ABE YASUO , KAIHO MASAYUKI , TAKADA YOSHIHIRO , TOYAMA YUJI , ISHIKAWA TOMINORI
IPC分类号： B01D46/00 , F24F7/00
摘要： PROBLEM TO BE SOLVED: To minimize the depth and height of the whole unit and to easily uniformize the wind-speed distribution at an air filter outlet by forming a unit top board in the blow-off direction of a centrifugal fan so that the unit top board has a shape having inclination approaching to the filter surface with an increase in the distance from a blow-off port of the centrifugal fan. SOLUTION: When the fan 106 rotates, external air is taken in from an air intake disposed at the upper side of a fan casing 102 and blown off to an air filter casing part 103 from an external air blow-off port 109. The air enters into an air regulating part 105 and is purified through an air filter 104 and then is blown off into a clean room. At this time, in the air regulating part 105, the inclination approaching to the filter surface with an increase in the distance from the blow-off port of the fan 106 is imparted to a casing top board in the blow-off direction of the fan 106. In this way, the sectional area in the air regulating part 105 is narrowed gradually and the blow-off from the air filter 104 is controlled and the deviation of the wind-speed distribution is eliminated.

26. 发明专利

JPH09280614A AIR CLEANING UNIT 失效
公开(公告)号：JPH09280614A
公开(公告)日：1997-10-31
申请号：JP9077796
申请日：1996-04-12
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： ISHIKAWA TOMINORI , TOYAMA YUJI , TERANO MASAYUKI , TAKADA YOSHIHIRO , HONMA KEIICHI
IPC分类号： F24F7/00 , F24F3/16
摘要： PROBLEM TO BE SOLVED: To realize functions of energy saving, low level noise, and averaged air velocity distribution in an air cleaning unit provided on a seiling or the like of a clean room. SOLUTION: A motor base 4 is fixed in a body housing 1, a motor 3 is fixed to a motor base 4, and an impeller 2 is connected to the motor 3. A filter 6 is connected to a lower part of the body housing 1. A partition 5 is provided on a lower side of the motor base 4. A bell mouth 7 is connected top an upper side of the body housing 1. An air cleaning unit which is excellent in efficiency, low in noise level, of low profile, and suitable for averaging the air velocity distribution can be obtained.

27. 发明专利

JPH0886297A FILTER UNIT 失效
公开(公告)号：JPH0886297A
公开(公告)日：1996-04-02
申请号：JP22139394
申请日：1994-09-16
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TAKADA YOSHIHIRO , YOSHITOMI TATSUO , TOYAMA YUJI , MIYAUCHI NORIO , HONMA KEIICHI
IPC分类号： F04D17/10 , B01D46/10 , B01D46/42
摘要： PURPOSE: To reduce the consumption power of a filter unit used mainly in a clean room and a clean bench and to reduce a cost. CONSTITUTION: Formation of a filter unit is such that a suction pipe 2 is arranged at the upper part of a unit 1 and an impeller 3 for a centrifugal fan, and a support member 5 for supporting a motor 4 for drive to the unit 1 are arranged at the lower part thereof, and sound absorbing members 7, 8, 9, and 10 to absorb a sound and introduce a flow in such a manner to reduce incurring of a flow loss are arranged in a flow passage running from the outer periphery of the impeller 3 to a filter 6. The outside diameter on the core plate 13 side is reduced to a value lower than the diameter D2s on the side plate 12 side of the impeller 11 and the outside diameter of the core plate side of the impeller 11 is reduced to a value lower than the outside diameter on the core plate of the impeller 11. Further, the outer periphery of the impeller 11 is formed approximately in the same diameter as that of the vicinity on the side plate 12 side. The outside diameter of the impeller is decreased from the middle of an outlet flow passage toward the core plate 13 and finally, the outside diameter of the impeller 11 on the core plate 13 side is reduced to a value lower than that of the core plate 13.

28. 发明专利

JPH04236041A AIR CLEANER DEVICE 失效
公开(公告)号：JPH04236041A
公开(公告)日：1992-08-25
申请号：JP254291
申请日：1991-01-14
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TOYAMA YUJI , HONMA KEIICHI , KOSOTO SOICHI , SUNAKAWA MASARO , TOMITA TAKASHI
IPC分类号： F24F7/06 , F24F13/02
摘要： PURPOSE:To improve a pressure loss in a flow passage, make a uniform distrubution of air speed, improve an efficiency of a blower, improve an energy saving and reduce noise totally and to make a small-sized air cleaner. CONSTITUTION:A sound absorption duct 5 connected to a filter 3 from a blower 2 through a pressure chamber 4 is so spirally formed that its cross-sectional area increases gradually. A duct outer plate 7 is of a porous plate 11. An air layer is formed between the porous plate 11 and an outer late 1 of a main body and then an air flowing into the filter part at an acute angle is formed. With such an arrangement, a uniform formation of distribution of air speed, the efficiency of a blower as well as the energy saving can be improved and noise is totally reduced. Then, an air cleaner device having a high cleaning ability and capable of being made in a small-size can be provided.

29. 发明专利

JPH0493186A CLEANING WORKBENCH 失效
公开(公告)号：JPH0493186A
公开(公告)日：1992-03-25
申请号：JP20811590
申请日：1990-08-08
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TERANO MASAYUKI , TOYAMA YUJI , HONMA SATOSHI
IPC分类号： B25H1/20
摘要： PURPOSE:To prevent dust, etc., from staying, by forming a recessed part at the outside of a door and utilizing this recessed part as a handle. CONSTITUTION:A recessed part 85 is formed at the outside of this door 7, and this recessed part 85 is utilized as a handle. The accumulation of dust, etc., is thus prevented, yet the workers caught thereon is surely prevented.

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