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1. 发明专利

JPH03255851A COMPRESSOR OPERATION CONTROL DEVICE FOR REFRIGERATION CYCLE DEVICE 失效
公开(公告)号：JPH03255851A
公开(公告)日：1991-11-14
申请号：JP5123590
申请日：1990-03-02
申请人： HITACHI LTD
发明人： TOMITA YOSHIKATSU , IBARAKI YOSHIAKI , SUEFUJI KAZUTAKA , SHIIBAYASHI MASAO , UCHIKAWA NAOSHI
IPC分类号： F04B49/06 , F04B49/10 , F25B1/00
摘要： PURPOSE:To minimize a loss in a bearing and prevent the generation of burning and solid sticking even when a rotary speed is low or a gas discharge pressure is high by computing a bearing constant value of a compressor's bearing and controlling said bearing constant value obtained from the relation between this value and a friction coefficient of the bearing so that the compressor may be operated with the optimum bearing characteristics. CONSTITUTION:The load of a compressor's bearing and the viscosity of lubricant are computed based on the detection output obtained from each sensor 11, 10, and 9, which detects the rotary speed of a compressor 2, a refrigerant input pressure, discharge pressure of the compressor and the oil temperature of the compressor. A bearing constant value is computed from these factors and the rotary speed of the compressor detected by a sensor 8. The viscosity of lubricant of the compressor is controlled by electrically adjusting the opening of an expansion valve 5 or a bypass control valve from the relationship between the computed bearing constant value and a friction coefficient of the bearing so that the bearing constant value may stay within a specified range. At the same time, the rotary speed of the compressor and or the discharge pressure may be controlled as occasion demands.

2. 发明专利

JPH03111522A PRODUCTION OF SLIDING PARTS OF ALUMINUM OR ALUMINUM ALLOY 失效
公开(公告)号：JPH03111522A
公开(公告)日：1991-05-13
申请号：JP24630889
申请日：1989-09-25
申请人： HITACHI LTD
发明人： YAMAMOTO AKIHIKO , YAMADA TOSHIHIRO , OKADA RYOJI , IBARAKI YOSHIAKI , OKAMOTO JOJI
IPC分类号： F04C18/02 , C22C1/02 , C23C26/00 , F01C17/06
摘要： PURPOSE:To inexpensively and speedily produce a sliding member having excellent wear resistance and high long-term reliability by subjecting the sliding part of Al or Al alloy to a rapid melting and rapid resolidifying treatment with a high density energy and providing numerous pores on the surface layer. CONSTITUTION:The sliding part of the Al alloy 6 of an Al-Si system, etc., where the above-mentioned Al alloys slide with each other or the Al alloy and cast iron, etc., slide each other is irradiated with a laser 8 of high density energy and is thereby subjected to the rapid melting and rapid resolidifying treatment. A surface layer 7 provided with numerous pores is formed on the surface layer of the above-mentioned Al alloy 6 in this way. The foregoing formation of Ni plating on the surface of the above-mentioned Al alloy 6 and the formation of the corrosion resistant Ni-Al alloy layer in the hole parts by the laser 8 are possible as well. The treating of the surface 7 is thereafter finished by machining or grinding to expose the pores. The lubricating condition of the sliding part is improved in this way, by which the breakage of oil films is prevented and the seizure resistance is improved; in addition, the hard alloy is formed on the surface and the wear resistance is thereby improved.

3. 发明专利

JPH02283882A SCROLL COMPRESSOR 失效
公开(公告)号：JPH02283882A
公开(公告)日：1990-11-21
申请号：JP10445089
申请日：1989-04-26
申请人： HITACHI LTD
发明人： OKAMOTO JOJI , UCHIKAWA NAOSHI , IBARAKI YOSHIAKI , SUEFUJI KAZUTAKA
IPC分类号： F04C18/02 , F01C17/06
摘要： PURPOSE:To improve wear resistance of a slide surface as the weight of each aluminum alloy part is reduced by a method wherein the one of the slide surfaces through which a revolving scroll and an Oldham's ring, both made of an aluminum alloy, are engaged with each other is formed by an iron series member. CONSTITUTION:A scroll compressor has a compression part formed such that laps 5b and 4b of fixed and revolving scrolls 5 and 4 are engaged with each other. An Oldham's ring 8 to allow revolving movement and prevention of rotation is mounted to the revolving scroll 4. The revolving scroll 4 and the Oldham's ring 8 are formed by using an aluminum alloy. In this case, the one of slide surfaces through which the revolving scroll 4 and the Oldham's ring 8 are engaged with each other is formed by using an iron series member. Namely, in the slide surfaces of a key groove 4h of the revolving scroll 4 and a key-shaped protrusion 8a of the Oldham's ring 8, for example, an iron series intermediate member 4j is disposed on the key groove 4h side.

4. 发明专利

JPH02245490A VARIABLE SPEED SCROLL COMPRESSOR 失效
公开(公告)号：JPH02245490A
公开(公告)日：1990-10-01
申请号：JP6619489
申请日：1989-03-20
申请人： HITACHI LTD
发明人： SHIIBAYASHI MASAO , IBARAKI YOSHIAKI , SUEFUJI KAZUTAKA , ARATA TETSUYA , TOMITA YOSHIKATSU , MIZUNO TAKAO
IPC分类号： F04C29/04 , F04C18/02
摘要： PURPOSE:To prevent scuffing at sliding sections and extend capacity control range by injecting a high-pressure liquid refrigerant into the compression chamber of a compressor which is provided with a fixed scroll and a turning scroll made of mutually different materials and driven by an inverter to regulate the expansion of both scrolls. CONSTITUTION:A closed container 1 incorporates a compressor 100, and is divided into a delivery chamber 1a and electric motor chambers 1b and 1c. A fixed scroll member 5 made of cast iron material and consisting of an end plate and a lap is provided with a delivery port 10 at its center and a suction port 16 on its outer periphery. A fine hole 5g for injecting fluid is drilled through the end plate 5. The turning scroll member 6 made of aluminum alloy, etc. is provided with an end plate 6a and a lap. A high-pressure liquid refrigerant is reduced in its pressure, led from a circuit 109 through the fine hole 5g, and injected into a compression chamber 7. A lubricating oil 22a is also cooled by this refrigerant gas. By this, mutual contact between both scroll laps made of mutually different materials can be prevented, thus reliability can be maintained and capacity control range can be extended.

5. 发明专利

JPH0281980A LAP SHAPE FOR SCROLL FLUID MACHINE 失效
公开(公告)号：JPH0281980A
公开(公告)日：1990-03-22
申请号：JP23246588
申请日：1988-09-19
申请人： HITACHI LTD
发明人： SUEFUJI KAZUTAKA , SHIIBAYASHI MASAO , ARATA TETSUYA , IBARAKI YOSHIAKI , OKAMOTO JOJI
IPC分类号： F04C18/02
摘要： PURPOSE:To compatibly obtain strength and performance by combining a bulb- shaped lap advantageous for the strength with a wedge-shaped lap advantageous for the performance. CONSTITUTION:A pressure of gas acts on a lap wall, generating force tending to curve a lap. Large moment is generated in the root of the lap decreasing the moment in accordance with its position toward the point end. The large moment is generated especially in the root of lap winding start parts 4C, 5C. Since a shape of the lap is formed thicker in the root of the winding start parts 4C, 5C and thinner as the position of the lap lap changes to its point end, the root improves its strength, and the point end part enables wide space to be generated in the inside when a fixed scroll 4 and a turn scroll 5 are combined. This space serves for a gas passage in a delivery stroke, and the passage, providing a large area with small fluid resistance, enables a loss to be reduced.

6. 发明专利

JPH01203961A DETECTOR FOR AIR FUEL RATIO MEASUREMENT 失效
公开(公告)号：JPH01203961A
公开(公告)日：1989-08-16
申请号：JP2751888
申请日：1988-02-10
申请人： HITACHI LTD
发明人： HARADA TAKESHI , KANAMARU MASATOSHI , IBARAKI YOSHIAKI , ICHIKAWA NORIO , UENO SADAYASU
IPC分类号： G01N27/41 , G01N27/416
摘要： PURPOSE:To obtain superior heat resistance and fast response and to take measurements over a wide range from a lean area to a rich area by covering an electrode outside a solid-state electrolyte element with a gas diffusion layer consisting of porous electric insulating metal oxide. CONSTITUTION:Porous thin-film electrodes 2a and 2b are provided on the internal and external surfaces of the solid-state electrolyte element made of oxygen ion conductive metal oxide and the electrode 2b outside the solid-state electrolyte element 1 is covered with the gas diffusion layer 3 consisting of the porous electric insulating metal oxide, and a constant voltage is applied between both electrodes 2a and 2b to ionize the oxygen in the atmosphere where the solid- state electrolyte element 1 is placed and also diffuse it in the solid-state electrolyte element. Further, the gas diffusion layer 3 which covers the entire surface of at least the external electrode 2b is formed of an extremely fine particle coating of porous magnesia spinel. Consequently, the heat resistance and response are superior and the air fuel ratio is measured over the wide range from the lean area to the rich area.

7. 发明专利

JPS63310599A HIGH FREQUENCY INDUCTION PLASMA GENERATING DEVICE 失效
公开(公告)号：JPS63310599A
公开(公告)日：1988-12-19
申请号：JP14512487
申请日：1987-06-12
申请人： HITACHI LTD
发明人： KANAMARU MASATOSHI , ARAYA TAKESHI , IBARAKI YOSHIAKI , ENDO KIJU , HIOKI SUSUMU
IPC分类号： H05H1/46 , C23C16/50 , H05H1/42
摘要： PURPOSE:To make it possible to produce ultra-micro particles of metal of high quality with a uniform particle diameter by providing a cooling means at the lower part of a torch for generating high frequency induction plasma so as to cool high temperature gas outputted from the torch rapidly at an instance. CONSTITUTION:High frequency current is supplied from a high frequency power source 1 to an induction coil 2, and this electric field is broken by dielectric by means of an ignition rod 7 so as to start a high frequency induction plasma 15. Cooling water is put between a heat resistant inner tube 3 and an outer tube 4, so the coil 2 is protected from high temperature plasma. A cooling means 5 is provided at the lower part of a torch 23, where high temperature plasma and high temperature gas outputted from the torch 23 are let through, so the gas is rapidly cooled, and in case material is supplied as particles, or when they are produced by high temperature chemical reaction, a good cooling speed can be obtained for condensation of products. Ultra-micro particles of metal of high quality of a uniform particle diameter can thus be obtained.

8. 发明专利

JPS63257128A MANUFACTURE OF HIGH-TEMPERATURE SUPERCONDUCTIVE WIRE 失效
公开(公告)号：JPS63257128A
公开(公告)日：1988-10-25
申请号：JP9075187
申请日：1987-04-15
申请人： HITACHI LTD
发明人： IBARAKI YOSHIAKI , KANAMARU MASATOSHI , ENDO KIJU , SHIRAKU YOSHINORI
IPC分类号： H01B12/04 , H01B13/00
摘要： PURPOSE:To improve the superconductive characteristic by reacting a multiple ultra-fine powder mixture in a furnace to obtain a high-temperature superconductive raw material, extending it into a fine wire, then heat-treating it. CONSTITUTION:Multiple ultra-fine powder raw materials are uniformly dispersed with the preset stoichiometric composition and mixed to obtain a ultra-fine powder mixture, which is reacted in a furnace to obtain a high-temperature superconductive raw material 1. Next, this high-temperature superconductive raw material 1 is packed into tubes 2, 4 formed with a superconductive stabilizing material to obtain a unit filament 3, which is extended to form a fine wire. The reaction is generated in the mixed raw material by the heat treatment of this fine wire. The reactivity, uniformity, and workability are thereby improved, and the excellent superconductive characteristics such as the high critical magnetic field and high critical current density can be obtained.

9. 发明专利

JPS60228609A PRODUCTION OF ULTRAFINE PARTICLES 失效
公开(公告)号：JPS60228609A
公开(公告)日：1985-11-13
申请号：JP8371584
申请日：1984-04-27
申请人： HITACHI LTD
发明人： ARAYA TAKESHI , OKADA RIYOUJI , IBARAKI YOSHIAKI , HIOKI SUSUMU , KANAMARU MASATOSHI , ENDOU KIJIYUU , HANEDA MITSUAKI
IPC分类号： B22F9/12 , B22F9/14
摘要： PURPOSE:To produce efficiently a large amt. of ultrafine particles by generating the vapor of a base metal by an arc on the surface of a raw material to be formed to the ultrafine particles and maintaining the arc under the arc current conditions under which plasma flow is generated there. CONSTITUTION:Gaseous Ar+50% H2 is passed between an electrode 1 and the raw material 3 on a holding base 2 to generate the arc. The ultrafine particles are formed in the arc state of a small current region if the electrode 1 is minus in this stage. The current density is consequently high in the cathode part of the electrode 1 and the anode point part of the raw material 3 and therefore the pressure in said part increases to the value higher than the arc pressure in the central part between the electrodes, thus generating gaseous flow toward the central part from both electrode parts. When such gaseous flow is generated, the plasma flow is generated as shown by arrows 5 from the surrounding to make up the gas at both electrode points. The metallic vapor is conveyed by the plasma flow (anode flame) and the ultrafine particles are continuously formed.

10. 发明专利

JPS60228607A MANUFACTURE OF HYPERFINE PARTICLES 失效
公开(公告)号：JPS60228607A
公开(公告)日：1985-11-13
申请号：JP8371384
申请日：1984-04-27
申请人： HITACHI LTD
发明人： KANAMARU MASATOSHI , ENDOU KIJIYUU , OKADA RIYOUJI , IBARAKI YOSHIAKI
IPC分类号： B22F9/12 , B22F9/14
摘要： PURPOSE:To manufacture efficiently metallic hyperfine particles by supplying an electric current having a wave-form obtd. by superposing a pulsating current which is larger than a fixed base current on the base current as an electric current for arc. CONSTITUTION:When hyperfine particles are manufactured from a metallic base material with an arc heat source, an electric current having a wave-form obtd. by superposing a pulsating current which is fairly larger than a fixed base current on the base current capable of maintaining arc is supplied as an electric current for arc generated between an electrode and the base material. In a period in which the pulsating current is supplied, generated arc is locally concentrated to increase the temp. of the base material just under the arc. In a period in which the base current is supplied, the arc is maintained by supplying the smaller base current.

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