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1. 发明专利

JPH08178579A PLATE TYPE EVAPORATOR 失效
公开(公告)号：JPH08178579A
公开(公告)日：1996-07-12
申请号：JP32595994
申请日：1994-12-27
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI
IPC分类号： F28F3/10
摘要： PURPOSE: To improve the evaporating capacity by preventing the oil from staying in a refrigerant passage far from an outflow port of a refrigerant outlet port to smoothly collect the oil. CONSTITUTION: Each plate 1 is horizontally arranged and laminated in the vertical direction, and an outflow port 32a of a refrigerant outlet port 32 is located to the lower part side of the laminated plates 1. The oil drop O flowing from each refrigerant passage 3 into a refrigerant outlet port 12 is dropped downward by the gravity, and collected to prevent the oil from staying in the refrigerant passage 3.

2. 发明专利

JPH06300369A OIL RETURNING DEVICE FOR REFRIGERATOR WITH LIQUID-FILLED COOLER 失效
公开(公告)号：JPH06300369A
公开(公告)日：1994-10-28
申请号：JP9109793
申请日：1993-04-19
申请人： DAIKIN IND LTD
发明人： HAYASHI HIROKAZU , FUJII TOSHIAKI , MASUDA KIYOSHI
IPC分类号： F25B1/00 , F25B43/02
摘要： PURPOSE:To eliminate oil shortage on a compressor side by a method wherein oil return is carried out to a compressor side from a liquid filled cooler in accordance with an oil amount on the compressor side, while minimizing reduction of freezing performance. CONSTITUTION:An oil return pipe 6 is provided between a liquid filled cooler 5 and a compressor 1, and a solenoid valve 7 is interposed in the oil return pipe 6. An oil level detector is provided in an oil collector 1e of the compressor 1. When the oil level in the oil collector 1e is lower than a prescribed level, the solenoid valve 7 is opened so that oil can be collected, if necessary. Thus, while preventing reduction of performance, an oil shortage problem can be solved.

3. 发明专利

JPH04335970A DRY EVAPORATOR 失效
公开(公告)号：JPH04335970A
公开(公告)日：1992-11-24
申请号：JP10765491
申请日：1991-05-13
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI
IPC分类号： F25B39/02 , F28D7/16
摘要： PURPOSE:To improve a dry evaporator in heat-exchanging efficiency and make it available at a low cost relative to the improvement by using a ripple-finned tube and a smooth tube in such a manner as to suit their respective peculiarities to the changes in state of the refrigerant flowing through a refrigerant circuit. CONSTITUTION:A channel for refrigerant is formed of a smooth tube 5, whose inner surface is smooth, in the region where the refrigerant becomes a slag flow and of a ripple-finned tube 6, whose inner surface has a spiral groove 62, in the region from the part for the slag flow to the outlet. For the exchange of heat with liquid to be cooled, the refrigerant is passed through the inexpensive smooth tube 5 in the region where the differences in heat-transfer rate on the side of refrigerant are small, that is, from the inlet to the part where the refrigerant forms a slag flow. In the region from the slag-flow-forming part to the outlet the refrigerant undergoes the exchange of heat through the ripple-finned tube 6 where use is made of a holding effect which causes the spiral groove 62 to collect the atomized particles in a vapor flow of the refrigerant. By forming a long circular region with good heat-exchanging efficiency for a vapor flow, a ripple-fined tube 6 can be used with good efficiency in heat-transfer rate on the side of refrigerant.

4. 发明专利

JPH0419037A MACHINE TOOL COOLING DEVICE 失效
公开(公告)号：JPH0419037A
公开(公告)日：1992-01-23
申请号：JP12199490
申请日：1990-05-10
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI
IPC分类号： B23Q11/12
摘要： PURPOSE:To enhance the processing accuracy by forming an evaporation chamber in connection with the low pressure piping of a refrigerating device at the peripheral regions of bearings, providing an intake for a low pressure liquid refrigerant which opens in the lower part of this evaporating chamber, also providing a takeout hole for low pressure gas refrigerant which opens in the upper part, and thereby cooling the spindle part down to a uniform temp. CONSTITUTION:In a cooling device of a machine tool in which a spindle 3 equipped below with a tool gripping part 31 is supported by a housing 1 through bearings 21, 22, and evaporating chamber 5 is formed at the peripheral regions of the bearings 21, 22 in such a way as surrounding them and in connection with the low pressure piping of the cooling device 6 fitted with a compressor 61, condenser 61, and expansion mechanism 63. In the lower part of this evaporating chamber 5, an intake 7 for low pressure liquid refrigerant is opened, while a takeout hole 8 for low pressure gas refrigerant is opened in the upper part of the evaporating chamber 5. The bearings 21, 22 and the spindle 3 are cooled through the evaporating action of refrigerant in the evaporating chamber 5 built in the cooling device 6, and the temp. difference in the spindle 3 axial direction can be reduced, which suppresses difference in the thermal deformation likely to appear in the axial direction.

5. 发明专利

JPH03152367A REFRIGERANT RECOVERING APPARATUS 失效
公开(公告)号：JPH03152367A
公开(公告)日：1991-06-28
申请号：JP28906489
申请日：1989-11-07
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI
IPC分类号： F25B45/00
摘要： PURPOSE:To shorten refrigerant recovering time, to simplify an apparatus, and to reduce its cost by interlocking the switching operation of a solenoid valve with a temperature switch and a pressure switch. CONSTITUTION:A recovery unit 4 fed to a recovery tank 4 through a condenser 2 and a heater 7 for supplying discharge gas to a refrigerant circuit W to be recovered through a charge port 6 are branched to be connected to the discharge side of a compressor 1. A suction passage 9 for sucking refrigerant of the circuit W is connected to the suction side of the compressor 1 through a recovery port 8. Further, a temperature switch 10 is arranged at the discharge side of the compressor 1 and a pressure switch 12 is arranged at the suction side of the compressor 1, and a solenoid valve 11 is provided in a heating passage 7. The switching operation of the valve 11 is interlocked with the switches 10, 12. Thus, a recovering operation is conducted in short time, a complicated control circuit is eliminated, and its cost is reduced.

6. 发明专利

JPH02196176A OIL LEVEL CONTROLLER AND OIL SEPARATOR IN REFRIGERATION UNIT 失效
公开(公告)号：JPH02196176A
公开(公告)日：1990-08-02
申请号：JP1290889
申请日：1989-01-20
申请人： DAIKIN IND LTD
发明人： OTSUKI AKIRA , OTSUKA KANAME , HIKITA OSAMU , MASUDA KIYOSHI
IPC分类号： F04C29/02 , F04B41/06 , F04C11/00 , F25B31/00
摘要： PURPOSE:To aim at the uniformization of oil levels in each oil separator by installing each overflow port in a proper oile-level height position of these oil separators, and connecting each port to a low pressure part, in a device which installs these oil separators severally in response to plural numbers of compressors operable in parallel. CONSTITUTION:Two units of screw compressors 10a, 10b are connected to each other operably in parallel, and each of oil separators 11a, 11b severally connected to each discharge side of these compressors 10a, 10b. These oil separators 11a, 11b are made up of installing a separating element 13 of a demister or the like in an oil separator body 12, while a discharge gas inlet pipe 16 is connected to each discharge side of the compressors 10a, 10b and a discharge outlet pipe 17 to one discharge pipe 19 via check valves 18a, 18b, respectively. In this case, overflow ports 20a, 20b are installed in the separator body 12 at a proper oil level height position, and these ports 20a, 20b are connected to an intermediate pressure parts 21b, 21a of other compressors 10b, 10a via oiling pipes 22b, 22a provided with check valves 23b, 23a and solenoid valves 24b, 24a.

7. 发明专利

JPS6488066A REFRIGERATION CIRCUIT 失效
公开(公告)号：JPS6488066A
公开(公告)日：1989-04-03
申请号：JP24506787
申请日：1987-09-28
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI , OTSUKA KANAME , KATAOKA OSAMI , MIYAMOTO TAKENORI
IPC分类号： F25B1/00
摘要： PURPOSE: To reduce the temperature hunting of a liquid refrigerant at the inlet of an expansion valve for intermediate cooler caused by the load change of a compressor or a main cooler by always supplying the refrigerant to the intermediate suction port of the compressor by providing a line by-passing the expansion valve. CONSTITUTION: When the operation of a compressor 21 is started, a high-temperature gas refrigerant is condensed by means of a condenser 22 and the temperature of the refrigerant becomes lower. Part of the condensed refrigerant is supplied to the intermediate suction port 21a of the compressor 21 by by-passing a discharged-gas temperature control valve 26 through a by-pass line 30 and cools the gas refrigerant in the compressor 21. Therefore, even when the actuation of the control valve 26 is delayed due to the heat capacity of a temperature-sensing section 29, the deterioration or seizure of the lubricating oil of the compressor 21 can be prevented. In addition, even when the temperature of the gas refrigerant discharged from the compressor 21 changes by the load change of the compressor 21 and the load change of a main cooler 25 or the start or termination of pumping down, the influence of the operation delay of the control valve 26 can be reduced and the temperature hunting of a liquid refrigerant at the inlet of the expansion valve 24 of a main refrigerating circuit can be reduced, because a small amount of refrigerant is supplied to the intermediate suction port 21a.

8. 发明专利

JPS61262566A ABSORPTION TYPE REFRIGERATOR 失效
公开(公告)号：JPS61262566A
公开(公告)日：1986-11-20
申请号：JP10463585
申请日：1985-05-16
申请人： DAIKIN IND LTD
发明人： KAWAI MITSUSHI , MASUDA KIYOSHI
IPC分类号： F25B15/00 , F25B33/00 , F25B43/00

9. 发明专利

JPH06272976A FLOODED TYPE EVAPORATOR 失效
公开(公告)号：JPH06272976A
公开(公告)日：1994-09-27
申请号：JP6358293
申请日：1993-03-23
申请人： DAIKIN IND LTD
发明人： YAMAMOTO SHINNOSUKE , HAYASHI HIROKAZU , FUJII TOSHIAKI , MASUDA KIYOSHI
IPC分类号： F25B1/00 , F25B1/053 , F25B39/02 , F25B43/02
摘要： PURPOSE:To return oil in sufficient quantities to a compressor even if oil is required to cool a motor in a screw type refrigerator and the like by ensuring the amount of return oil from a flooded type evaporator to the compressor. CONSTITUTION:A refrigerant liquid inlet port 3 is provided on the lower side of a horizontally long shell 1 including a plurality of heat exchange tubes 2 of a flooded type evaporator and a refrigerant gas outlet port 5 is provided on the upper side of the shell 1. The port 5 is opened on the side of the shell 1 above the arrangement of the tubes 2, while a refrigerant gas outlet pipe 6 is connected to the port 5. A guide vane 7 is provided in the shell 1 in such a manner that it extends from the lower end of the port 5 obliquely upwards and its upper surface is connected continuously to the inner surface of the port 5 at the lower end thereof, so that oil separated from refrigerant gas by being guided by the upper surface of the guide vane 7 is transferred over the upper surface of the vane 7 to introduce the oil to the side of the port 5, thereby forming an oil storage on the continuous area between the port 5 and the vane 7.

10. 发明专利

JPH04335971A DRY EVAPORATOR 失效
公开(公告)号：JPH04335971A
公开(公告)日：1992-11-24
申请号：JP10765591
申请日：1991-05-13
申请人： DAIKIN IND LTD
发明人： MASUDA KIYOSHI
IPC分类号： F25B39/02 , F28D7/16
摘要： PURPOSE:To make a dry evaporator using a costly inner-finned device available at low cost relative to its costly use by employing an inexpensive smooth tube for a part of the channel for refrigerant without lowering the heat-exchanging efficiency. CONSTITUTION:A channel for refrigerant is formed of a smooth tube 5 and an inner- finned tube 6: said smooth tube 5, whose inner surface is smooth, is used for the part from the inlet into a shell 1 to the region where a ring-shaped flow of refrigerant, that is, a flow in contact with the inner surface of the tube, comes to an end; said inner-finned tube 6, which is provided with inner fins 62 inside, is used for the part from where the ring-shaped flow ends to the outlet of the channel. For the exchange of heat with liquid to be cooled, the refrigerant is passed through an inexpensive smooth tube 5 for the part of the channel from the inlet to the end of the ring-shaped flow, since in this particular region the difference in heat-transfer rate on the side of the refrigerant between the inner-finned tube 6 and the smooth tube 5 is small. For the exchange of heat in the region from where the ring-shaped flow ends to the outlet, use is made of the inner-finned tube 6 whose area effective for the exchange of heat per unit length is large so that the good heat-transfer rate of the inner-finned tube 6 on the side of refrigerant can be put to efficient use.

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