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1. 发明专利

JPH05113184A SCREW COMPRESSOR 失效
公开(公告)号：JPH05113184A
公开(公告)日：1993-05-07
申请号：JP27426291
申请日：1991-10-22
申请人： DAIKIN IND LTD
发明人： KATAOKA OSAMI
IPC分类号： F04C18/16 , F04C29/02
摘要： PURPOSE:To reduce the obstruction for the suction of a rotor by reducing the inflow of lubricating oil to the suction side of the rotor by forming an oil supplying passage which communicates to a high pressure side bearing, at a sealing part between an edge part chamber having a high pressure side bearing installed and the high pressure part of the rotor. CONSTITUTION:A screw rotor 2 having a screw groove 21 is installed in the casing 1 of a screw compressor, and a suction side chamber 31 having a low pressure side bearing 3 installed and a high pressure side edge part chamber 5 in which a bearing housing 51 supporting a high pressure side bearing 4 are formed. A sealing part 7 is formed by fitting the bearing housing 51 and the rotor 2 each other, and an oil supplying passage which communicates to the high pressure side bearing 4 is opened. The lubricating oil which leaks from the sealing part 7 is allowed to flow to the high pressure side bearing side 4 from the oil supplying passage 8. The lubricating oil which flows into the suction side of the rotor 2 reduces by that portion, and the increase of the specific capacity of the sucked gas due to the overheat of the lubricating oil and the gasification of coolant are reduced. Accordingly, the reduction of the capacity efficiency due to the obstruction for the suction to the rotor 2 is prevented.

2. 发明专利

JPH0526525A OVERHEAT PREVENTING DEVICE FOR COMPRESSOR MOTOR FOR TWO-STAGE FREEZER 失效
公开(公告)号：JPH0526525A
公开(公告)日：1993-02-02
申请号：JP17528591
申请日：1991-07-16
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI , KATAOKA OSAMI , YAMAGUCHI NORIHIDE
IPC分类号： F25B1/10
摘要： PURPOSE:To prevent overheating of a motor without causing compression of liquid and to increase the operation range of a freezer by a method wherein when a motor coil temperature is higher than the saturation temperature, equivalent to a pressure, of a pressure detected by a pressure detector by the given degree of overheat, a liquid refrigerant is injected to the upper stream side of the motor. CONSTITUTION:A two-stage compression device 1 comprises a low stage compressor 1a, a high stage compressor 1b, and a motor 1c coaxially driving the compressors 1a and 1b, and a gas refrigerant delivered from the low stage compressor 1a is sucked in the high stage compressor 1b through the motor 1c. A refrigerant injecting means 9 of the overheat preventing device of the compressor motor 1c injectes a liquid refrigerant to the motor upper stream side of a refrigerant flow flowing through the motor 1c to control a motor coil temperature when a motor coil temperature detected by a coil temperature detector 7 is higher than the saturation temperature, equivalent to a pressure, of a refrigerant pressure detected by a pressure detector 8 by the given degree of overheat. This constitution prevents overheat of the motor 1c without causing compression of liquid by the compression device 1 and enables the increase of the operation range of a refrigerant machine.

3. 发明专利

JPH02248684A CAPACITY CONTROL DEVICE FOR SCREW TYPE TWO-STAGE COMPRESSOR 失效
公开(公告)号：JPH02248684A
公开(公告)日：1990-10-04
申请号：JP6905889
申请日：1989-03-20
申请人： DAIKIN IND LTD
发明人： OTSUKA KANAME , KATAOKA OSAMI
IPC分类号： F04C18/16 , F04C23/00 , F04C28/12 , F04C28/26
摘要： PURPOSE:To prevent the actuation failure in the capacity control of a low-stage side compressor at the low differential pressure time by opening multiple capacity control holes along the movement direction of a slide valve in a first control chamber for controlling the slide valve to a lod up side, and communicating these capacity control holes with a low pressure side of a high-stage compressor through switching valves. CONSTITUTION:The high pressure of a discharge side of a high-stage compressor is always acted on a second control chamber 11 of a cylinder 6 provided in a low-stage compressor 1 through a connecting pipe 17, and while the chamber 11 is communicated with a first control chamber 10 through a throttle 16 and the chamber 10 is communicated with a low pressure side of the compressor 2 by the switching operation of switching valves 14, 15 and these communications are cut off to operate a piston 5, and a slide valve 3 is moved to control the capacity. When both valves 14, 15 are closed, the force obtained by multiplying the differential pressure of the middle pressure MP and the low pressure LP acting on both end surfaces of the valve 3 to a sectional area of the valve 3 and the force obtained by multiplying the differential pressure of the high pressure HP and the middle pressure MP to a sectional area of a rod 4 are simultaneously and respectively act on a lod up side, and the valve 3 is moved without the difference of the middle pressure MP and the low pressure LP.

4. 发明专利

JPH0827088B2 失效
公开(公告)号：JPH0827088B2
公开(公告)日：1996-03-21
申请号：JP16960890
申请日：1990-06-27
申请人： DAIKIN IND LTD
发明人： KATAOKA OSAMI
IPC分类号： F25B1/047 , F25B1/10

5. 发明专利

JPH0642474A SINGLE SCREW COMPRESSOR 失效
公开(公告)号：JPH0642474A
公开(公告)日：1994-02-15
申请号：JP19842592
申请日：1992-07-24
申请人： DAIKIN IND LTD
发明人： KATAOKA OSAMI
IPC分类号： F04C18/16 , F04C18/08 , F04C18/52 , F04C18/107
摘要： PURPOSE:To prevent the generation of seizure between a screw rotor and a casing inner cylinder covering the outer peripheral part of the screw rotor by reducing the difference of thermal expansion between both. CONSTITUTION:The front part of a partitioning wall 8 for partitioning a low pressure chamber 6 which communicates to a suction side and a high pressure chamber 7 which communicates to a discharge side is erected in close to the edge surface part on the suction side in the axial direction of a screw rotor 1 in close to the low pressure chamber 6, at the position averting from the opened port part to the low pressure chamber 6 side which is formed on a casing inner cylinder 4, i.e., a suction port 41 which is formed by cutting one side contiguous part of a gate rotor 2 and a bypass port 42 which is formed by cutting the installation part of a capacity control valve 3, and the casing inner cylinder 4 is brought into contact in a wide range for the high pressure chamber 7, and the excessive cooling from the low pressure chamber 6 is prevented, and the difference of thermal expansion between the screw rotor 1 and the casing inner cylinder 4 is reduced.

6. 发明专利

JPH05113183A SINGLE SCREW COMPRESSOR 失效
公开(公告)号：JPH05113183A
公开(公告)日：1993-05-07
申请号：JP27426191
申请日：1991-10-22
申请人： DAIKIN IND LTD
发明人： YONEDA HIROYUKI , KATAOKA OSAMI
IPC分类号： F04C18/16 , F04C18/52 , F04C27/00
摘要： PURPOSE:To prevent the breakage of a sealing member by installing a sealing member in impulse movable form, in a sealing member installation groove which is formed along a screw thread and installing a regulating means for regulating the impulse stroke. CONSTITUTION:A screw rotor 3 having the screw thread 2 having a top face 21 is installed in the casing 1 of a single screw compressor. A sealing member installation groove 6 opened on the top face 21 of the screw thread 2 is formed along the screw thread 2, and a sealing member 7 is installed in impulse movable form in the radial direction of the screw rotor 3. A regulating means 8 for regulating the impulse stroke of the sealing member 7 is installed between the installation groove 6 and the sealing member 7. Then, the rotor 3 is revolved in the state where the top edge of the sealing member 7 is approached to the inner wall of the casing 1. Accordingly, sealing performance is improved, and the friction due to contact is reduced, and seizure is prevented.

7. 发明专利

JPH04358776A COMPRESSOR 失效
公开(公告)号：JPH04358776A
公开(公告)日：1992-12-11
申请号：JP13441591
申请日：1991-06-05
申请人： DAIKIN IND LTD
发明人： INOUE TAKASHI , KATAOKA OSAMI
IPC分类号： F04B39/00 , F04C29/00 , F04C29/06
摘要： PURPOSE:To reduce noise from a compressor without increasing the number of parts by utilizing a terminal cover which is a component part of the compressor. CONSTITUTION:A terminal cover 7 is formed with a damping steel plate. The end of the terminal cover 7 is fixed in contact with an outer wall 11 of a easing 1 to damp vibration transmitted from a motor section and a compressor section to the terminal cover 7 by means of the characteristics of the damping steel plate. Thus a noise from the casing 1 itself as well as that from the terminal 7 itself is reduced and a noise from the whole compressor can be reduced without increasing the number of parts.

8. 发明专利

JPH0460345A DEVICE OF PREVENTING OVER-HEATING OF COMPRESSOR MOTOR IN FREEZER DEVICE 失效
公开(公告)号：JPH0460345A
公开(公告)日：1992-02-26
申请号：JP16960790
申请日：1990-06-27
申请人： DAIKIN IND LTD
发明人： KATAOKA OSAMI , SHIBUYA EISAKU , YAMAGUCHI NORIHIDE
IPC分类号： F25B1/00 , F25B1/047
摘要： PURPOSE:To prevent over-heating of a compressor motor by a method wherein this device is comprised of a coil temperature sensor for use in sensing a motor coil temperature and a load reducing means for reducing a motor load for a specified period of time when the motor coil temperature is increased. CONSTITUTION:A motor 1a of a compressor 1 is provided with a coil temperature sensor 8 for use in sensing the coil temperature of the motor 1a. A load reducing means 9 for reducing the load of the motor 1a in response to an output from the coil temperature sensor 8 when the coil temperature in the motor 1a is increased more than a predetermined temperature is installed in a pipe passage of the freezer. With such an arrangement, over-heating prevention of the motor 1a can be accurately and positively carried out and then the operating range of the freezer can be expanded.

9. 发明专利

JPH0326879A OIL SEPARATOR FOR COMPRESSOR 失效
公开(公告)号：JPH0326879A
公开(公告)日：1991-02-05
申请号：JP16193889
申请日：1989-06-23
申请人： DAIKIN IND LTD
发明人： SHIBUYA EISAKU , HIKITA OSAMU , KATAOKA OSAMI
IPC分类号： F04B39/04 , F04C18/16 , F04C23/00 , F04C29/02
摘要： PURPOSE:To prevent the oil splashing-up due to the agitation disturbance of oil and the one-sided deflection phenomenon of oil due to the gas flow by installing a receiving plate which receives the discharged gas coolant which flows in from an inlet and suppresses the collision of an oil reservoir part onto the oil surface. CONSTITUTION:The discharged gas coolant which passes through the first oil separating body 5A from an inlet 2 and flows into an oil reservoir part 1a side from a side wall between a supporting plate 4 and a housing H and is once received by a receiving plate 6 without directly colliding with the oil surface O in the oil reservoir part 1a, and reversed to the upper side, and supplied into the second oil separating body 5B side. Therefore, the discharged gas coolant is prevented from disturbing the oil surface O in the oil reservoir part 1a, and the oil is not splashed up. Further, since the collision of the discharged gas coolant with the oil surface O is suppressed by the receiving plate 6, the one-sided deflection phenomenon of the stored oil in the oil reservoir part 1a is suppressed, and the oil staying region in the oil reservoir part 1a is reduced, and the lowering of the oil level on a filter F side is prevented, and the inflow of the high pressure discharged gas into the filter F is suppressed.

10. 发明专利

JPH06101672A SCREW COMPRESSOR 失效
公开(公告)号：JPH06101672A
公开(公告)日：1994-04-12
申请号：JP24973392
申请日：1992-09-18
申请人： DAIKIN IND LTD
发明人： KATAOKA OSAMI
IPC分类号： F04C18/16
摘要： PURPOSE:To prevent the occurrence of a seizure at a thrust seal section by providing the circular thrust seal section faced with a screw rotor and a stationary member together in the axial direction on a seal section partitioning the high-pressure area of the outer periphery section of the screw rotor, and forming a spiral groove on it. CONSTITUTION:When a screw rotor 2 is rotated by a motor via a drive shaft 12 in the casing 1 of a screw compressor, the low-pressure gas guided into a low-pressure side end section chamber from a suction port is compressed along a screw groove 20, and it is discharged via a high-pressure side end section chamber 3. The high-pressure side end section chamber 3 is partitioned against the high-pressure area of the outer periphery section of the screw rotor 2 via a seal section 5 provided between the screw rotor 2 and a bearing box 4. A thrust seal section 51 and a radial seal section 52 are formed on the seal section 5 while the screw rotor 2 and the bearing box 4 are faced together in the axial direction and the radial direction respectively, a spiral groove 8 extended from the outer periphery section to the inner periphery section is formed on the thrust seal section 51, and a labyrinth 9 is formed on the radial seal section 52.

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