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1. 发明专利

JPH04155163A STACKED EVAPORATOR 失效
公开(公告)号：JPH04155163A
公开(公告)日：1992-05-28
申请号：JP27905890
申请日：1990-10-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SAWAHATA TAKATOMO , WATANABE MASAKAZU
IPC分类号： F25B39/02 , F28D1/03
摘要： PURPOSE:To improve the heat-exchange efficiency of the title evapolator, and to increase the cooling capacity thereof, by a method wherein at one part in which the dryness of a refrigerant is small, refrigerant pathways are formed so that a heat transfer area becomes larger, and the other part in which the dryness thereof is large, the refrigerant pathways are formed so that the refrigerant is well mixed. CONSTITUTION:Each tube element 1b for which insert fins 5 are held between tube plates 1a to be refrigerant pathways, or each tube element 1d for which two tube plates 1c wrought in the shape of irregularities are put together, and each corrugated fin 2 are alternately stacked, and thus the title evaporator is formed. The tube elements 1b are arranged on the side of an inlet pipe 3 for a refrigerant, and the tube elements 1d are arranged on the side of an outlet pipe 4 therefor. Since the tube elements 1b in which the insert fins 5 having a large heat transfer area are held for the refrigerant pathways, are located within the range of X, the efficiency of heat-exchange is made larger. On the other hand, although the dryness of the refrigerant on the downstream side is as large as nearly equal to one by evaporation, the deflected flow of the refrigerant is restrained since guides for mixing the refrigerant liquid and the refrigerant gaseous are formed. In ranging the whole of the part of Y, therefore, the heat-exchange between the refrigerant and air is equally performed, and thus the efficiency of the heat--exchanges is improved and the capacity of cooling is increased.

2. 发明专利

JPH0455665A CONDENSER 失效
公开(公告)号：JPH0455665A
公开(公告)日：1992-02-24
申请号：JP16411190
申请日：1990-06-25
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SAWAHATA TAKATOMO , YAMAMOTO MICHITOSHI , WATANABE MASAKAZU
IPC分类号： F25B39/04 , F28F27/02
摘要： PURPOSE:To effectively utilize whole capacity of a condenser during a high load and to prevent lowering of heat exchange capacity by a method wherein an on-off valve and the closing part of a double pipe are arranged to the double pipe part of a header pipe, located in the vicinity of an inlet part for a refrigerant, so that a refrigerant is prevented from flowing in a flat pipe. CONSTITUTION:A small pipe 4 is inserted in an upper header pipe 1a to form a double pipe, and a closed part 5 is located in the header pipe 1a on the outer side of deepmost end part of the small pipe 4. An on-off valve 6 to pass and shut off the flow of a refrigerant is located in the header pipe la on the outer side of the refrigerant inlet part of the small pipe 4. By closing the on-off valve 6, capacity of a condenser is reduced, and by decreasing heat exchange capacity, the delivery pressure and the suction pressure of a variable capacity compressor are prevented from lowering. Running of the compressor is practicable, and a vaporizer is prevented from being iced. By opening the on-off valve 6 during a high load, capacity of the condenser can be entirely effectively utilized. Especially, a refrigerant is guided to a part, spaced away from an inlet part for a refrigerant, by means of the small pipe 4 because of an upper head pipe 1a being a double pipe, and deficiency in a refrigerant is prevented from occurring.

3. 发明专利

JPH03279797A HEAT EXCHANGER 失效
公开(公告)号：JPH03279797A
公开(公告)日：1991-12-10
申请号：JP7688790
申请日：1990-03-28
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： WATANABE MASAKAZU , SAWAHATA TAKATOMO , KITAHARA YUICHI , FUKUSHIMA TOSHIHIKO , YAMAMOTO MICHITOSHI
IPC分类号： F25B39/04 , F28F9/02 , F28F9/18
摘要： PURPOSE:To provide a heat exchanger having a structure in which a flow of heat exchanging fluid is not hindered by a method wherein at least one end of a thermal transmitting pipe is formed into a shape corresponding to an inner side shape of a cross-sectional one of a header. CONSTITUTION:Since a header 21 has a circular cross section, and end part of a thermal transmitting pipe 1 is machined in an arc form corresponding to its inner shape. The thermal transmitting pipe 1 is inserted into an insertion hole 211 arranged in the header 21. The thermal transmitting pipe 1, header 21 and fins 3 are integrally connected to each other by brazing. Since the thermal transmitting pipe 1 is connected along the inner surface shape of the header 21, it does not prohibit the flow of the heat exchanging fluid. As a result, a resistance in a flow passage is not increased and thus it is possible to prevent a reduction in an amount of feeding flow into the thermal transmitting pipe 1 or a disadvantage of non-uniform distribution or the like.

4. 发明专利

JPH04292796A LAMINATED TYPE HEAT EXCHANGER 失效
公开(公告)号：JPH04292796A
公开(公告)日：1992-10-16
申请号：JP5629991
申请日：1991-03-20
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SAWAHATA TAKATOMO , WATANABE MASAKAZU , KUDO MITSUO
IPC分类号： F28D9/00 , F28F9/02
摘要： PURPOSE:To reduce the resistance of fluid by increasing the sectional area of fluid passage at a hole part while allowing burred parts for preventing positional deviation of a cupped part of a tube plate to remain as it is. CONSTITUTION:Burred parts 1b of a cupped part 1b are formed at upper, lower, right and left positions, and holes are enlarged while leaving a width L necessary to connect the cupped parts. Since the burred parts are formed at four positions of the upper, lower right and left positions, the sectional area of fluid passage at the hole part is increased while preventing vertical and lateral positional deviations of the cupped part, thereby reducing the passage resistance of fluid.

5. 发明专利

JPH04203798A PILED UP HEAT EXCHANGER 失效
公开(公告)号：JPH04203798A
公开(公告)日：1992-07-24
申请号：JP32917390
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SAWAHATA TAKATOMO , WATANABE MASAKAZU
IPC分类号： F28F3/06
摘要： PURPOSE:To prevent any inferior or poor brazing at a tank part by a method wherein a lower part of a tube plate at a tank part is provided with a step difference lower than an projecting height of the tank part under a pressing work. CONSTITUTION:A lower part 11a of a tube plate 1 facing to a tank part 11 is provided with a step difference 11c. The step difference 11c and an upper part 2a of a corrugated fin 2 are contacted to each other, brazing material is flowed to cause both of them to be connected to each other. Brazing portions 11b of tank portions are connected to each other under a collection of their adjoining brazing materials, resulting in that no occurrence of voids or the like and no poor or inferior brazing is found. This is caused by the fact that there is a certain step difference 11c between a connected part of the corrugated fins 2 with an upper part 2a and a brazing portions 11b of tank portions and there is a far distance between them and the adjoining brazing materials at the brazing part 11b of the tank portions is not sucked to the contact portion with the upper part 2a of the corrugated fins 2. A step difference 11c is provided at a lower part 11a of the tank 11, thereby occurrence of void at the brazing portions 11b of the tank portions and occurrence of poor brazing can be prevented and then a piled-up heat exchanger having no poor air-tightness and having no poor anti-pressure can be attained.

6. 发明专利

JPH0456624A AIR CONDITIONING DEVICE FOR AUTOMOBILE AND CONTROL METHOD THEREOF 失效
公开(公告)号：JPH0456624A
公开(公告)日：1992-02-24
申请号：JP16411790
申请日：1990-06-25
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： WATANABE MASAKAZU , SAWAHATA TAKATOMO
IPC分类号： B60H1/32
摘要： PURPOSE:To run a compressor at a low opening air temperature without the occurrence of seizure of a compressor due to a refrigerant too small in quantity by providing a means to run a variable capacity compressor in prior to a means to stop the variable capacity compressor through detection of a refrigerant pressure. CONSTITUTION:When air conditioning switch 14 is turned ON, an under-mentioned function is carried out by means of a controller 9. Namely, ON and OFF of a low pressure switch 8 is decided by a CPU 11 through the working of an AD converter 10. A magnet clutch 6 is turned ON through a compressor drive circuit 12 regardless of ON and OFF to run a variable capacity compressor 1. When the low pressure switch 8 is turned ON, processing of a delay is effected by means of the CPU 11 and a time lag is produced. When it is turned OFF, the magnet clutch 6 is turned OFF. Further, when the low pressure switch 8 is turned OFF, namely, an open air temperature is below 0 deg.C, by reducing a variable capacity condenser 2 to minimum capacity, an outlet refrigerant pressure is increased and the variable capacity compressor 1 is continuously run.

7. 发明专利

JPH04366395A HEAT EXCHANGER AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH04366395A
公开(公告)日：1992-12-18
申请号：JP13894591
申请日：1991-06-11
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： WATANABE MASAKAZU , TAKESO MASANORI , MASUI ISAMI , SAWAHATA TAKATOMO
IPC分类号： F28F1/12 , C07D213/71 , C07D417/04 , F28F1/30 , F28F13/18 , F28F19/01 , F28F19/04
摘要： PURPOSE:To improve hydrophilic properties of a surface film of a heat exchanger of an evaporator, etc., and to prevent occurrence of cracks and offensive odor. CONSTITUTION:An inorganic series hydrophilic film 12 to be formed on an outer surface of a tube 1, a fin 2 of an evaporator E, is formed of a polymer silica film containing polymer silica 11 as a main ingredient, water dispersive polyamide series resin (or water dispersive polyamine series resin) 9 and antibacterial reagent 10. The contents are, for example, 60-80wt.% the silica 11, 10-40wt.% the polyamide series resin 9, and 3-10wt.% the reagent 10. When the film 12 is provided in the evaporator E, its hydro-extraction is conducted by increasing an air flow speed distribution more toward downward by an air blow, and conducted while inclining the evaporator E at least in one of longitudinal and lateral directions.

8. 发明专利

JPH0464879A CONDENSER 失效
公开(公告)号：JPH0464879A
公开(公告)日：1992-02-28
申请号：JP17656390
申请日：1990-07-04
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： WATANABE MASAKAZU , SAWAHATA TAKATOMO , KITAHARA YUICHI
IPC分类号： F25B6/02 , F25B39/04
摘要： PURPOSE:To make the heat transfer area of a condensor variable and permit the control of the capacity of heat dissipating amount by providing a refrigerant flow amount control means in a piping means connected in parallel to headers opposed to the inlet port and the outlet port of refrigerant. CONSTITUTION:When a refrigerant flow amount control valve 6 is closed, refrigerant, entered from a refrigerant inlet port 5, flows into an upper header 1b through the branch pipe 5c of a pipeline 5a, then, passes through the heat transfer tube 3 of section B and flows into a lower header 2, then, flows out of a refrigerant outlet port 7. Next, when the refrigerant flow amount control valve 6 is opened, the refrigerant, entered from the refrigerant inlet port 5, is distributed into upper headers 1a, 1b through the pipeline 5a and a branch pipe 5b, passes through heat transfer tubes 3 of both of sections A, B and flows into the lower header 2, then, flows out of the refrigerant outlet port 7. In this case, the lengths of the upper headers 1a, 1b are changed, the number of heat transfer tubes 3 in the section A is increased with respect to the same in the section B to operate the section A as a main condensing unit and operate the section B as an auxiliary condensing unit. Accordingly, effective heat transfer area is changed in accordance with the ratio of the number of heat transfer tubes in the main condensing unit A to the same in the auxiliary condensing unit B depending on a condition whether the refrigerant flow amount control valve 6 is closed or opened whereby the capacity of the amount of heat dissipation is changed.

9. 发明专利

JPH04155191A LAMINATION TYPE HEAT EXCHANGER 失效
公开(公告)号：JPH04155191A
公开(公告)日：1992-05-28
申请号：JP27632390
申请日：1990-10-17
申请人： HITACHI LTD
发明人： KUDO MITSUO , FUKUSHIMA TOSHIHIKO , SAWAHATA TAKATOMO , AMO KIYOSHI
IPC分类号： F28F3/06 , F25B39/02 , F28D1/03 , F28D9/00 , F28F3/02
摘要： PURPOSE:To secure effective heat transfer area and improve cooling capacity by a method wherein a predetermined gap is provided between the outer peripheral end of the opposite side of a tank in an U-shape flow passage and the end of inner fin of the opposite side of the tank. CONSTITUTION:A predetermined gap S is provided between the end 22 of the opposite side of an inner fin 3, arranged in a heat transfer tube, and the end 22d of an outer periphery at the opposite side of the tank to form a communicating passage 23g. Gas phase refrigerant and liquid phase refrigerant in an inlet side refrigerant flow passage 2a flow down while being mixed by crossing flow generated by a notch 25c provided on the inner fin 3, then, flow into the communicating passage 23g having the predetermined gap S. In this case, the gap S is narrow compared with the width of the refrigerant flow passage 2 and, therefore, the refrigerant is accelerated in the communicating passage 23g. Accordingly, the liquid phase refrigerant is pulverized so as to be the type of mist whereby the liquid phase refrigerant is mixed well with the gas phase refrigerant. According to this method, gas/liquid separation due to a density difference accompanied by the curvature and conversion of flow in an U-turn section can be restrained while the generation of stagnated part of the gas refrigerant can be restrained. Accordingly, an effective heat transfer area in the tube can be secured and cooling capacity can be improved.

10. 发明专利

JPH03129270A LAMINATION TYPE EVAPORATOR 失效
公开(公告)号：JPH03129270A
公开(公告)日：1991-06-03
申请号：JP24206289
申请日：1989-09-20
申请人： HITACHI LTD
发明人： SAWAHATA TAKATOMO , YAMAMORI HEITARO , MIYAMOTO SEIGO , KUDO MITSUO
IPC分类号： F25B39/02
摘要： PURPOSE:To sufficiently heat-exchange a liquid refrigerant with air to evaporate so as to prevent the outflow of the refrigerant by allowing a refrigerant to meander to flow toward the flow direction of air. CONSTITUTION:A liquid refrigerant allowed to flow in from an introduction pipe 8 is allowed to flow in first refrigerant passages 4-4c connected transversely and meander to flow in the direction shown by arrow marks in second refrigerant passages 6-6c a plurality of times to always become a counterflow to the flow of air. Accordingly, the refrigerant is allowed to meander to flow in the refrigerant passages 6-6c to evaporate and is gradually phase-changed from liquid to gas to increase a specific volume. Thereby the whole refrigerant is evaporated so as to prevent the outflow of the liquid refrigerant.

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