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公开(公告)号：JPH07120182A
公开(公告)日：1995-05-12
申请号：JP26214593
申请日：1993-10-20
Applicant: MATSUSHITA REFRIGERATION
Inventor： TANIGUCHI MITSUNORI , KIDO OSAO
IPC: F28F1/40
Abstract: PURPOSE:To improve the coefficient of heat transfer between a refrigerant and a heat transfer pipe, in a condenser with fins to apply and receive heat between a refrigerant for an air-conditioner, a freezing device, and an automobile device and fluid, such as air. CONSTITUTION:By forming fine spiral grooves 6a and 6b in a direction, in which the grooves are inclined from the bottom of a pipe toward the side of a pipe situated downstream of an air flow, in the inner surface of the tube inner surfaces of a heat transfer tube 5a situated upper stream of an air flow and a heat transfer tube 5b situated downstream of an air flow, a large quantity of liquid refrigerants flowing through a pipe bottom are prevented from flowing to the upper stream place of an air flow having a high heat-exchange quantity. The coefficient of heat transfer between the helical grooves 6a and 6b and a refrigerant is sharply improved and heat transfer on the refrigerant side is promoted on the whole of a condenser.
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公开(公告)号：JPH06347187A
公开(公告)日：1994-12-20
申请号：JP13588993
申请日：1993-06-07
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , TANIGUCHI MITSUNORI
IPC: F28F1/40
Abstract: PURPOSE:To improve the heat transfer coefficient between refrigerant and a heat transfer tube of a finned heat exchanger used for an air conditioner, a refrigerating machine, an automobile equipment and other, where heat transfer takes place between fluids such as refrigerant and air. CONSTITUTION:The depth of upstream side flutes 7a of a heat transfer tube 6 is deeper than that of downstream side flutes 7b, so that the amount of refrigerant overflowing from the upstream side flutes 7a of the heat transfer tube 6 where heat exchange amount is large can be reduced. On the downstream side of the heat transfer tube 6 where heat transfer amount is small, refrigerant easily reaches up to the bottoms of the downstream side flutes 7b, so that the heat transfer to refrigerant is increased on both upstream and downstream sides of the heat transfer tube 6 and the heat transfer on refrigerant side as the overall heat exchanger is significantly promoted.
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公开(公告)号：JPH0612231B2
公开(公告)日：1994-02-16
申请号：JP15904885
申请日：1985-07-18
Applicant: MATSUSHITA REFRIGERATION
Inventor： YONEDA HIROSHI , KIDO OSAO
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公开(公告)号：JPH04126999A
公开(公告)日：1992-04-27
申请号：JP24773690
申请日：1990-09-17
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , NAKAYAMA KOICHI
IPC: F28F1/40
Abstract: PURPOSE:To improve heat transfer performance by continuously providing a plurality of oblique grooves in a direction at a predetermined slope to a tube axial direction and a plurality of parallel grooves in a direction parallel to the axial direction in a crossing state on the inner periphery of a tube, and reducing the sectional area of the passages of the parallel grooves smaller than those of the oblique grooves. CONSTITUTION:Oblique grooves 10 are continuously formed in a direction at a predetermined slope to a direction of a tube axis (n) and parallel grooves 11 are formed in a direction parallel with the direction of the axis (n) on the inner periphery 8a of a boiling heat transfer tube 8. In refrigerant, liquid refrigerant flowing to the bottom of the tube is pulled up by a capillary tube phenomenon in an area having a low flowing speed to increase its effective heat transfer area. Since the grooves 10, 11 are provided, liquid refrigerant holding amount is much, and since the sectional area of the groove 11 is smaller than that of the groove 10, the flow of the liquid refrigerant mainly of the flow along the groove 10 is obtained even in not only high dryness area but low dryness area with much liquid refrigerant to sufficiently obtain heat transfer acceleration effect. In the area having large refrigerant flowing speed, the liquid refrigerant flow along the groove 11 is more than that of the oblique groove, and the thickness of the liquid refrigerant is uniformly reduced by capillary tube mainly at the grooves 11 to accelerate the heat transfer.
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公开(公告)号：JPH049210A
公开(公告)日：1992-01-14
申请号：JP11390490
申请日：1990-04-26
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , NAKAYAMA KOICHI , IDE SHINICHI
Abstract: PURPOSE:To form a heat transfer tube of high performance by cutting and dividing a metallic band plate which grooves or protrusiones are formed on the surface into a width equivalent to the periphery if heat transfer tube and making each of divided metallic band plates into a tube with plural tube making devices. CONSTITUTION:Grooves 34 or protrusiones are formed on the surface of the metallic band plate 21 which is continuously delivered in width equivalent to the periphery of plural heat transfer tubes 22 with a working device 24. The metallic band plate 21 is cut and divided into the width equivalent to the periphery of the heat transfer tube 22 along the longitudinal direction with a cutting device 28. Heat transfer tubes 22a, 22b are manufactured by forming each of divided metallic band plates 21a, 21b tubularly with plural tube making devices 30a, 30b, welding both edges of each of the metallic band plates 21a, 21b and making tubes using high frequency induction coils 33a, 33b. In this way, tube making of good accuracy and reliable welding can be executed.
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Patent Agency Ranking
公开(公告)号：JPH03268816A
公开(公告)日：1991-11-29
申请号：JP6885990
申请日：1990-03-19
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO , NAKAYAMA KOICHI , IDE SHINICHI
Abstract: PURPOSE:To form a metallic strip having an asymmetric groove pattern making spiral grooves retaining distortion and warpage, to manufacture an accurate tube with two tube manufacturing equipments and to enable reliable welding by dividing and cutting a metallic strip having a width equivalent to the peripheral length of a heat transfer tube. CONSTITUTION:The metallic strip 21 provided with a width 2W twice the equivalent of the peripheral length of the heat transfer tube is delivered from a delivering device 23. Then, grooves 34 having a fixed lead angle each on the surface are formed in a symmetrical pattern in the longitudinal direction through between a working roll 26 and rolling rolls 27a-27c of a working device 24. Further, after this metallic strip 21 is divided by the cutter 29 of a cutting device 28 into two parts or into metallic strips 21a, 21b having a width W each equivalent to the peripheral length of the heat transfer tube 22 and forms asymmetric groove pattern having a fixed lead angle making spiral grooves 35, the metallic strips 21a, 21b are formed by the forming rolls 31a-31j, 32a-32j of the two parallel manufacturing equipments 30a, 30b respectively into a tubular shape and both edge sides are welded by high frequency induction coils 33a, 33b to form final heat transfer tubes 22a, 22b.
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公开(公告)号：JPH03230063A
公开(公告)日：1991-10-14
申请号：JP2652490
申请日：1990-02-06
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
IPC: F25B39/00
Abstract: PURPOSE:To keep the most appropriate number of passes during an evaporating operation and during a condensing operation and provide the most active application of a capability of a heat exchanger for a heat pump type air conditioner by a method wherein the number of passes in a coolant circuit during the condensing operation is lower than that in the coolant circuit during an evaporating operation through a changing-over of a four-way valve. CONSTITUTION:During an evaporating operation, a coolant is flowed from a coolant pipe 2'', passes through a coolant pipe 2c through a four-way valve 4, branched at a branch pipe 3a into two passes and then the coolant flows into a coolant pipe 2a constituting an upper heat exchanging core 1a and a coolant pipe 2b constituting a lower heat exchanging core 1b. During a condensing operation, in turn the coolant flows from a coolant pipe 2' and through a changing-over of the four-way valve 4, a circuit at the coolant pipe 2d is closed. The coolant passes through a branch pipe 3b and flows into the coolant pipe 2a constituting an upper heat exchanging core 1a. The coolant flows into the coolant pipe 2b constituting the lower heat exchanging core 1b through the branch pipe 3a. The coolant heat exchanges with air and the coolant is condensed, thereafter the coolant is flowed out of the coolant pipe 2''. A pressure loss of the coolant in the pipe is higher than that of the evaporating operation and the most appropriate number of passes is larger at the condensing operation than that at the evaporating operation. For example, the coolant circuit is changed over to two passes during an evaporating operation and in turn the coolant circuit changes over to one pass during a condensing operation so as to get a high capability.
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公开(公告)号：JPH03129298A
公开(公告)日：1991-06-03
申请号：JP26652289
申请日：1989-10-13
Applicant: MATSUSHITA REFRIGERATION
Inventor： KIDO OSAO
IPC: F28F1/40
Abstract: PURPOSE:To improve the heat transfer efficiency of the inner side of a pipe not only in a refrigerant high dryness area but also in a range of from a low dryness area to a middle dryness area by a method wherein a number of fine protrusions continued in the direction of the axis of the pipe or in a helical direction based on the pipe axis are formed on an inner surface, and the shape thereof is formed approximately in the shape of a circle a part of which makes contact with the inner peripheral surface of the pipe. CONSTITUTION:When protrusions 8 are formed on an inner peripheral surface 6' of a condensation heat transfer pipe 6, condensate is collected in a groove 9 between the adjoining protrusions 8 through the action of a surface tension. Since, even in a region where an amount of a liquid refrigerant in a range of from a low dryness area to a middle dryness area is high, a protrusionsform surface is formed approximately in the shape of a circle, the influence of a surface tension is sharply exercised on the liquid refrigerant, which is difficult to be held on an upper surface 8a of the protrusion, and is easily discharged to a bottom part 8b of the protrusion and the groove 9 between the adjoining protrusions 8. Since the liquid refrigerant flowing in the groove 9 is also held at the bottom part 8b of the protrusion, it is difficult to flow out to the upper surface 8a of the protrusion, and can smoothly flow the groove 9. This constitution enables a fluid state to maintain an annular flow and improves heat transfer efficiency on the inner side of the pipe throughout the whole of a dryness area.
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公开(公告)号：JPH02309193A
公开(公告)日：1990-12-25
申请号：JP12963589
申请日：1989-05-23
Inventor： KASE HIROAKI , KIDO OSAO , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
Abstract: PURPOSE:To allow condensed water to easily drop by a method wherein drainage surfaces for intercommunicating flat plate fins in the direction of a stage are formed in the surfaces, on the downstream side of a flat groove, of the flat plate fins each having flat grooves formed in stages such that the front edge side in the direction of an air flow is notched, and louvers inclined in the direction of gravity from the upper stream side of an air flow to the down-stream side thereof are provided. CONSTITUTION:Drainage surfaces 9 for intercommunicating flat fins 7 in the direction of a stage are formed in the surface, on the downstream side of a flat groove 8, of the flat fin 7 having flat grooves 8 in stages formed such that the fron edge side in the direction of an air flow is notched. Louver 10 inclined in the direction of gravity from the upper streams side to the downstream side are provided. Thus, even when a heat exchanger with a fin is used as a vaporizer and water drops are condensed on an outer surface, water drops residing between the louvers 10 inclined in the direction of gravity from the upper stream side of an air flow to the downstream side thereof are influenced by an air flow and gravity and moved over the upper surface of a flat pipe 11 on the downstream side along the louvers 10. Thereafter, the water drops can drop to a lower stage along the drainage surfaces 9 for intercommunicating the flat fins in the direction of a stage. This constitution effects excellent drop of water drops and enable suppression of the increase of draft resistance of an air flow and lowering of the efficiency of heat transfer.
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公开(公告)号：JPH02251093A
公开(公告)日：1990-10-08
申请号：JP7094589
申请日：1989-03-23
Inventor： KIDO OSAO , KASE HIROAKI , NAKAMURA TAKASHI , AOKI AKIRA , AOYANAGI OSAMU
IPC: F28F1/30
Abstract: PURPOSE:To improve the dropping of water drips condensed on the outer surface of flat tubes and prevent the increase of the ventilating resistance of airflow as well as the deterioration of heat transfer rate by a method wherein a draining surface, communicating between flat fins in the direction of stages, is provided at the downstream side of flat grooves of the flat fin while the inserting direction of flat tubes into the flat grooves is slanted into the direction of gravity. CONSTITUTION:A finned heat exchanger is constituted of flat fins 7, provided with a plurality of stages of flat grooves 8 constituted by notching the leading edge of the fin in the direction of airflow A, and flat tubes 11, inserted into the flat grooves 8 of the flat fin 7 from the side thereof, while a draining surface 9, communicating between the flat fins in the direction of the stages, is provided at the downstream side of the flat grooves 8 of the flat plate fin 7 and the inserting direction of flat tubes 11 into the flat grooves 8 is slanted into the direction of gravity (g). When water drips L are condensed on the outer surface of the fin 7, the water drips L, stagnating on the upper surfaces of the flat tubes 11, move toward downstream side along the upper surfaces of the slanted flat tubes 11 and, thereafter, drop to a lower stage along the draining surface 9 communicated in the direction of the stages whereby the dropping of the water drips L may be improved and the increase of the ventilating resistance of the airflow A as well as the deterioration of the heat transfer rate of the title heat exchamber may be restrained.
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