JP2014137199A - Heat exchanger and cooling system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cost increase without increasing replacement operations such as the replacement of metal mold parts by using a common cutting blade even if plate fins are formed into a corrugated wave shape and the cutting blade needs to be used in a cutting process after a continuous molding process.SOLUTION: Since peripheral edges of all plate fines 3 are formed flat, it is possible to use a common cutting blade for cutting parts in a metal mold. Therefore, it is possible to increase lineups according to specifications of the fins, to make a heat exchanger thinner by increasing the strength of the fins, to improve performance by adopting a fine corrugated shape, and to suppress metal mold cost.

Description

  The present invention relates to a so-called dogbone type fin-and-tube heat exchanger used as a cooler (evaporator) in a household or commercial refrigerator, a showcase or the like, and a cooling system using the same. .

  In recent years, for example, home refrigerators tend to fix the outer dimensions of the main body and increase the internal capacity, and as a result, cooling system-related parts are required to be more compact year by year.

  In commercial refrigerators, the launch of energy-saving models has begun in earnest, and as a result, higher efficiency of cooling system-related parts is required.

  Under such circumstances, there is an increasing demand for compactness and high efficiency of heat exchangers.

  On the other hand, the demand for rationalization of component materials has increased due to soaring raw materials, and in addition to improving the performance of heat exchangers, there has been a demand for rationalization of thin materials.

  For example, a serpentine refrigerant tube is inserted into a so-called dogbone-shaped long hole processed into a plate fin, and an economical aluminum pipe can be used. A dock bone type heat exchanger provided is known (for example, see Patent Document 1).

  12 to 20 show a conventional heat exchanger described in Patent Document 1. In FIG.

  12 is a front view of a conventional heat exchanger, FIG. 13 is a side sectional view showing an AA section, FIG. 14 is a plan sectional view showing a BB section, FIG. 15 and FIG. FIG. 17 is a front view illustrating a conventional flat fin, and FIG. 17 is a cross-sectional view illustrating an end cutting state of the conventional flat fin.

  18 and 19 are front views showing a conventional corrugated fin, and FIG. 20 is a cross-sectional view showing an end cutting state of the conventional corrugated fin.

  The configuration of the conventional heat exchanger 101 includes a refrigerant tube 102 bent in a meandering manner at a predetermined pitch so that a plurality of rows and stages are formed in a staggered manner in which a straight pipe portion and a curved pipe portion are continuously formed. A plurality of long holes 104 each having a rectangular portion 104a and a circular arc portion 104b provided on both short sides of the rectangular portion 104a are provided on the plate surface, and at least two rows of independent plate fins 103 are provided. A plurality of them are arranged at intervals. Further, a corrugated corrugated 105 is formed in the step direction on the surface of the plate fin 103 so that the ridge line 105a is parallel to the row number direction, and a flat flat seat 106 is formed on the periphery of the long hole 104. The heat exchanger is formed and has a flat edge 107 that is long and flat in the step direction formed at the end of the plate fin 103 so as to be substantially perpendicular to the ridge line 105 a of the corrugate 105.

  Further, the plate fin 103 is cut by the cutting blade 108 to form an end portion.

  The operation of the heat exchanger 101 configured as described above will be described below.

First, on the surface of the plate fin 103, the corrugated corrugated 105 is formed in the step direction so that the ridge line 105a is parallel to the number of rows, so that the drop direction of water droplets adhering to the heat exchanger is reduced. The efficiency of the heat exchanger is increased by preventing the corrugated 105 shape from being obstructed and increasing the heat exchange area with the air.

  In addition, since a flat flat seat 106 is formed on the periphery of the long hole 104, the arc portion 104b of the long hole 104 contacting the refrigerant tube 102 can be easily formed, and the strength is insufficient due to the presence of the rectangular portion 104a. Can be compensated by flattening the peripheral edge of the long hole 104, and the contact heat resistance between the refrigerant tube 102 and the plate fin 103 is reduced, so that the efficiency of the heat exchanger is increased.

  In addition, the flat and flat edge 107 that is elongated in the step direction so as to be substantially perpendicular to the ridgeline 105a of the corrugated 105 is formed at the end of the plate fin 103, thereby reducing the warping and twisting of the fin and reducing the ventilation resistance. As a result, the efficiency of the heat exchanger is increased.

JP 2012-189235 A

  However, in the configuration of the conventional heat exchanger 101, when the plate fin 103 is press-molded, the corrugated corrugated 105 is molded in the step direction. Therefore, in the cutting process after the continuous press processing in the plate fin 103 molding, A cutting blade 108 that matches the waveform is used.

  However, when the shape and size of the corrugated plate fin 103 shown in FIGS. 18 and 19 change, or when the surface of the plate fin 103 shown in FIGS. 15 and 16 is flat, FIGS. It is necessary to change the shape of the cutting blade 108 as shown.

  Therefore, there is a problem that the mold is manufactured for each shape, or switching work such as mold replacement is increased, resulting in an increase in cost.

  The present invention solves the above-mentioned conventional problems. Regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the cost of the mold is reduced, and a highly efficient and economical heat exchanger is provided. It aims at providing the used cooling system.

  In order to solve the above-mentioned conventional problems, the heat exchanger of the present invention is bent in a meandering manner at a predetermined pitch so that a plurality of rows and stages are formed in a staggered manner in which a straight pipe portion and a curved pipe portion are continuously formed. A plate fin provided with a processed refrigerant tube and a plurality of long holes formed on the plate surface, each having a rectangular portion and a circular arc portion provided on both short sides of the rectangular portion, and the plate fins are spaced apart from each other. The refrigerant tube is passed through the long hole, and on the surface of the plate fin, corrugated molding is applied in the step direction so that the ridge line is parallel to the row number direction, In addition, a flat flat seat is formed at the peripheral edge of the long hole, and the entire peripheral edge of the plate fin is formed by flat molding.

  As a result, the entire peripheral edge of the plate fins is flat molded, so that the cutting blades (side cuts, slits between rows, cut-offs, etc.) of the parts in the mold can be shared. It is possible to increase the thickness by increasing the fin strength and to improve the performance by increasing the surface area by adopting a fine corrugated shape, and it is possible to reduce the mold cost.

  Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a highly efficient and economical heat exchanger and a cooling system using the heat exchanger can be provided.

  The heat exchanger of the present invention and the cooling system using the heat exchanger are designed to reduce the mold cost regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, and to achieve a highly efficient and economical heat exchanger. A cooling system using the same can be provided.

The front view of the heat exchanger in Embodiment 1 of this invention Side surface AA line sectional view of the heat exchanger in Embodiment 1 of the present invention. Plane BB sectional drawing of the heat exchanger in Embodiment 1 of this invention Front view of heat exchanger according to Embodiment 2 of the present invention Side surface AA sectional view of the heat exchanger in Embodiment 2 of this invention Plane BB sectional drawing of the heat exchanger in Embodiment 2 of this invention The front view of the corrugated fin in Embodiment 1 of this invention Sectional drawing of corrugated fin edge part cutting | disconnection condition in Embodiment 1 of this invention The front view of the fine corrugated fin in Embodiment 3 of this invention Sectional drawing of the fine corrugated fin edge part cutting condition in Embodiment 3 of this invention The schematic diagram of the cooling system in Embodiment 4 of this invention Front view of conventional heat exchanger Side surface AA sectional view of FIG. Plane BB sectional view of FIG. Front view of a conventional two-row flat fin Front view of a conventional 3-row flat fin Sectional view of the conventional flat fin end cutting situation Front view of a conventional two-row corrugated fin Front view of a conventional three-row corrugated fin Sectional view of the conventional corrugated fin end cutting situation

  According to the first aspect of the present invention, there is provided a refrigerant tube bent in a meandering manner at a predetermined pitch so that a plurality of rows and stages are formed in a staggered manner in which a straight pipe portion and a curved pipe portion are continuously formed, and a rectangular portion And a plate fin provided with a plurality of long holes made of arc portions provided on both short sides of the rectangular portion on the plate surface, and a plurality of the plate fins are arranged at intervals, and the long holes are The refrigerant tube is penetrated, and the corrugated corrugation is formed in the step direction so that the ridge line is parallel to the row number direction on the surface of the plate fin. A flat flat seat is formed, and the entire peripheral edge of the plate fin is formed by flat molding.

  As a result, the entire peripheral edge of the plate fins is flat molded, so that the cutting blades (side cuts, slits between rows, cut-offs, etc.) of the parts in the mold can be shared. It is possible to increase the thickness of the fin by increasing the fin strength and to control the mold cost.

Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a highly efficient and economical heat exchanger can be provided.

  According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the corrugated corrugated pitch is a pitch that divides the diameter of the refrigerant tube into a plurality of portions.

  Thereby, in addition to the effect similar to that of the first aspect of the invention, high performance can be achieved by increasing the surface area by adopting a fine corrugated shape.

  Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a more efficient and economical heat exchanger can be provided.

  The invention according to claim 3 is a cooling system comprising a compressor, a condenser, a pressure reducing device, an evaporator, and a blower for forcibly ventilating the evaporator. A cooling system using the described heat exchanger as an evaporator.

  Thereby, it becomes what was excellent in the energy-saving characteristic as a cooling system, and can provide a highly efficient and economical cooling system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a front view of a heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view from the side of the heat exchanger taken along line AA in FIG. 1, and FIG. It is sectional drawing from the plane side of the heat exchanger by a B line.

  FIG. 7 is a front view of the corrugated fin according to the first embodiment of the present invention. FIG. 8 is a cross-sectional view of the corrugated fin end cutting state in the first embodiment of the present invention.

  1, 2, and 3, the heat exchanger 1 includes a refrigerant tube 2 in which a refrigerant flows and a plurality of plate fins 3 arranged at predetermined intervals.

  The plate fin 3 is a material made of aluminum or aluminum alloy.

  The refrigerant tube 2 is a single tube made of aluminum or aluminum alloy, and a straight pipe portion and a curved pipe portion are continuous, and a plurality of the refrigerant tubes 2 are staggered in the step (left and right) direction X and the row (up and down) direction Y. The serpentine tube is bent in a meandering manner, and forms one refrigerant flow path without using a connecting pipe that forms a curved pipe portion.

  And the straight pipe part of the refrigerant | coolant tube 2 becomes the structure closely_contact | adhered with the plate fin 3 because the curved pipe part of the refrigerant | coolant tube 2 penetrates the long hole 4 formed in the plate fin 3 independent at least every 2 rows. ing.

  In FIG. 7, the corrugated corrugated molding is applied to the surface of the plate fin 3, and the long hole 4 processed in the corrugated fin 3a has a rectangular portion 4a and an arc portion 4b, and is formed on both short sides of the rectangular portion 4a. Each of the arc portions 4b is formed in a long hole shape continuously.

Further, a corrugated corrugation 5 is processed in the step direction on the surface of the plate fin 3 so that the ridge line 5a is parallel to the column number direction, and a flat flat is formed on the peripheral portion of the long hole 4. A seat 6 is formed, and an elongated flat edge 7 is also formed on the entire periphery of the plate fin.

  About the heat exchanger 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, a corrugated fin 3a mold is generally fed with an aluminum sheet wound in a roll shape, forming corrugated corrugations, flat seats 6 and flat edges 7 in the corrugating process, and long in the piercing process. The lower hole of the hole 4 is processed, and the rectangular portion 4a and the arc portion 4b of the long hole 4 are subjected to edge processing in a burring process.

  Next, both sides of the aluminum sheet are cut (not shown) in the side cutting step, and are cut into a predetermined number of rows (not shown) in the inter-row slitting step.

  Finally, the fin sheet that has passed through the feed mechanism in the cut-off process is cut to a predetermined fin height, and the processing is completed.

  FIG. 8 shows a cross section of the cutting state in the cut-off process.

  If the corrugated shape of the corrugated fins 3a changes, the punch and die in the corrugating process are switched.

  At that time, the entire peripheral edge of the corrugated fin 3a is formed flat, so that the cutting blades (side cut, slit between rows, cut off, etc.) of the parts in the mold can be shared. It is possible to reduce the wall thickness by increasing the fin strength and reduce the mold cost.

  Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a highly efficient and economical heat exchanger can be provided.

(Embodiment 2)
4 is a front view of a heat exchanger according to Embodiment 2 of the present invention, FIG. 5 is a cross-sectional view from the side of the heat exchanger taken along line AA in FIG. 4, and FIG. It is sectional drawing from the plane side of the heat exchanger by a B line.

  The same constituent elements as those in the first embodiment will be described with the same reference numerals.

  The operation and action of the heat exchanger 1 configured as described above will be described below.

  First, the plate fin 3 is an integral fin that is not divided in the direction of the number of rows. In such a mold for forming the plate fin 3, an aluminum sheet wound in a roll shape that is generally equal to or slightly larger than the width of the fin is fed, and in the corrugating process, the corrugated corrugation, the flat seat 6, and the flat edge 7 is formed, a pilot hole in the long hole 4 is processed in the piercing process, and an edge process is applied to the rectangular part 4a and the arc part 4b of the long hole 4 in the burring process.

  Next, both sides of the aluminum sheet are cut in the side cutting step. Finally, the fin sheet that has passed through the feed mechanism in the cut-off process is cut to a predetermined fin height, and the processing is completed.

If the corrugated shape changes, the punch and die in the corrugating process are switched.

  At that time, the entire peripheral edge of the plate fin 3 is formed flat, so that the cutting blades (side cut, cut off, etc.) of the parts in the mold can be shared. It is possible to reduce the wall thickness by increasing the strength and to reduce the mold cost.

  Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a highly efficient and economical heat exchanger can be provided.

(Embodiment 3)
FIG. 9 is a front view of the fine corrugated fin 3b according to the third embodiment of the present invention, and FIG. 10 is a cross-sectional view of the state of cutting the end of the fine corrugated fin 3b according to the third embodiment of the present invention. The same constituent elements as those of the first embodiment will be described with the same reference numerals.

  The operation and action of the heat exchanger 1 using the fine corrugated fins 3b configured as described above will be described below.

  First, the corrugated pitch of the fine corrugated fins 3b is such that the diameter of the refrigerant tube 2 is divided into a plurality of parts, and has a very fine corrugated shape.

  Therefore, high performance can be achieved by increasing the surface area by adopting a fine corrugated shape.

  Therefore, regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, the die cost can be reduced, and a more efficient and economical heat exchanger can be provided.

(Embodiment 4)
FIG. 11 is a schematic diagram of a cooling system in the fourth embodiment.

  The present cooling system includes a compressor 9, a condenser 10, a decompression device 11, an evaporator 12, and a blower 13 that forcibly ventilates the evaporator 12. Furthermore, the cooling system uses the heat exchanger described in the first to third embodiments as the evaporator 12.

  The heat exchanger 1 has high cost performance, and by being mounted on the cooling system, the heat exchanger 1 has excellent energy saving characteristics and can provide a highly efficient and economical cooling system.

  Moreover, by mounting this cooling system on a household refrigerator, the refrigerator has excellent energy saving characteristics, and a highly efficient and economical refrigerator can be provided.

  Similarly, the same effect can be obtained by installing this cooling system in a commercial refrigerator or vending machine.

The heat exchanger of the present invention and the cooling system using the heat exchanger are designed to reduce the cost of the mold regardless of the plate fin surface shape lineup in the dog bone type heat exchanger, and are highly efficient and economical. It can be widely used as a cooler or radiator for refrigeration equipment ranging from household use to industrial use such as vending machines.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Refrigerant tube 3 Plate fin 3a Corrugated fin 3b Fine corrugated fin 4 Long hole 4a Rectangular part 4b Arc part 5 Corrugated 5a Ridge line 6 Flat seat 7 Flat edge 8 Cutting blade 9 Compressor 10 Condenser 11 Pressure reducing device 12 Evaporation 13 Blower

Claims (3)

A straight tube portion and a curved tube portion are continuously formed in a plurality of rows and stages in a staggered manner so that the refrigerant tube is bent in a meandering manner at a predetermined pitch, and the rectangular portion and the short sides on both sides of the rectangular portion. A heat exchanger comprising a plate fin provided with a plurality of long holes made of circular arc portions provided on the plate surface, a plurality of the plate fins arranged at intervals, and the refrigerant tube passing through the long hole. The surface of the plate fin is corrugated in the step direction so that the ridge line is parallel to the number of rows, and a flat flat seat is formed on the periphery of the long hole. And the heat exchanger which flat-molded all the peripheral parts of the said plate fin. The heat exchanger according to claim 1, wherein the corrugated pitch of the corrugation is a pitch that divides the diameter of the refrigerant tube into a plurality of portions. In a cooling system comprising a compressor, a condenser, a pressure reducing device, an evaporator, and a blower for forcibly ventilating the evaporator, the heat exchanger according to claim 1 or 2 is used as an evaporator. Cooling system.

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