JP2013120007A - Heat exchanger and cooling system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical heat exchanger which increases the strength of a side plate in a dog-bone type heat exchanger with independent fins for the improvement of heat exchange efficiency and performs an excellent frosting/defrosting operation.SOLUTION: Because corrugating processing is applied to a surface of a side plate 5 to make a ridge line parallel with a vertical direction, a flat seat 7 is formed at a peripheral edge of a long hole 4, and a slender flat groove 8 is formed in a step direction, ventilation resistance can be reduced to drastically improve heat exchange efficiency, and furthermore, the strength of the side plate can be increased to eliminate a bend or tear, thereby improving rigidity as a heat exchanger.

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. There are known dockbone heat exchangers (see, for example, Patent Document 1 and Patent Document 2).

  9 to 12 show conventional heat exchangers described in Patent Document 1 and Patent Document 2 described above.

  9 is a front view of a conventional heat exchanger, FIG. 10 is a side sectional view showing an AA section, FIG. 11 is a plan sectional view showing a BB section, and FIG. 12 is a front view showing a conventional side plate. FIG.

  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. In addition, a plurality of long holes 104 each including a rectangular portion 104a and an 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 and at least four rows or more are provided. A heat exchanger having a side plate 105 having a plate width, a plurality of plate fins 103 arranged at intervals, a plurality of side plates 105 arranged at both ends or one end, and a refrigerant tube 102 penetrating through a long hole 104 It is.

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

First, a plurality of plate fins 103 are arranged with a space between each other, and when penetrating the refrigerant tube 102 through the long hole 104, a burring is formed on the periphery of the long hole 104 with the curved pipe portion of the refrigerant tube 102 as a head. Although it is inserted from the base side of the collar, generally, the outer diameter of the refrigerant tube 102 and the inner diameter of the arc portion 104b of the long hole 104 are substantially the same in order to improve the adhesion between the refrigerant tube 102 and the plate fin 103. Due to the fact that the straight tube portion of the refrigerant tube 102 is straight and the accuracy of the angle and bending pitch of the refrigerant tube formed in a staggered manner, the insertion resistance is not a little. Since at least every two rows are independent, only the edge of the plate fin 103 can be held as the refrigerant tube 102 penetrates. In, in practice, warp or torsion becomes liable to occur in the plate fin 103 as shown in FIGS. 9 and 11. Note that cost rationalization by reducing the material thickness of the plate fin 103 has spurred this phenomenon.

  In addition, by arranging a plurality of side plates 105 at both ends or one end of the heat exchanger 101, the plate fins 103 are independent at least every two rows and are arranged at intervals. Even if the plate fins 103 are fixed tightly after passing through the plurality of plate fins 103, the heat exchanger 101 is divided into two rows at the portion where the plate fins 103 are disposed. Therefore, the side plate 105 arranged at the end portion has an effect of fixing the shape which is originally arranged at an interval aiming at the boundary layer leading edge effect. However, due to the recent thinning of the material, the side plate 105 having substantially the same thickness as the plate fin 103 is brought into contact with and in contact with the plate fins 103 that are divided in two rows as shown in FIG. Due to insufficient strength of the side plate 105, it is bent at the left end in FIG. 9 or torn off at the right end, so that the entire heat exchanger 101 is deformed. This is the current situation.

  Further, as an example of means for ensuring the strength of the plate fins and improving the heat exchange performance even if the material is thinned, a heat exchanger having a corrugated corrugated shape on the surface of the plate fins is known ( For example, see Patent Document 3 and Patent Document 4).

  The corrugated shape applied to the plate fins of these conventional heat exchangers (not shown) is such that the ridge line is substantially perpendicular to the wind direction and the height of the corrugated peak is relatively high so that the heat exchange air It aims to promote turbulence. Further, the flat seats formed around the circular holes increase the strength of the plate fins and contribute to the improvement of the strength of the heat exchanger against bending.

Japanese Patent Laid-Open No. 4-86491 JP 11-333539 A No. 07-17955 Japanese Patent No. 4607470

  However, in the configuration of the conventional heat exchanger 101, since the side plate 105 is insufficient in strength, the plate fins 103 divided and arranged every two rows approach or contact each other, or the side plate 105 is bent or torn. The entire heat exchanger 101 is deformed.

  Therefore, by arranging the plate fins 103 in a state of being divided at least every two rows, what contributes to improving the heat exchange performance by the boundary layer leading edge effect as the heat exchanger 101 is the plate fins. Due to the approach / contact of 103, there was a problem that the heat exchanger performance was deteriorated and uneven frost was caused during cooling operation.

  In addition, there is a problem that an error in mounting to the housing occurs due to deformation of the heat exchanger 101.

Further, the side plate 105 is likely to be warped or twisted. In particular, as the material of the side plate 105 is made thinner, warping and twisting are more likely to occur. As the side plate 105 is warped or twisted, the ventilation resistance of the heat exchanger 101 is increased to some extent, and generally depends on the characteristics of the blower for forced ventilation, but the air volume generally decreases, and the heat exchange amount decreases. Had.

  In order to increase the strength of the side plate 105, it is better to corrugate the surface of the side plate 105 and form a flat seat around the circular hole. On the other hand, when corrugated so that the ridgeline is substantially vertical, the ventilation resistance is increased, and the heat exchange amount is also decreased.

  The present invention solves the above-mentioned conventional problems, and improves bending and torsion of the side plate in the dog bone type heat exchanger, reduces ventilation resistance, and increases the strength of the side plate, thereby preventing bending and tearing. Eliminating and improving the rigidity as a heat exchanger improves the deformation and provides a highly efficient and economical heat exchanger that takes into account the reliability of frosting and defrosting and a cooling system using the heat exchanger It is for the purpose.

  In order to solve the above-described conventional problems, the heat exchanger according to 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 plurality of long holes made of a processed refrigerant tube, a rectangular portion and arc portions provided on both short sides of the rectangular portion are provided in the plate surface, and at least two rows of independent plate fins, and the long holes A plurality of side plates having a plate width of at least four rows or more provided on the plate surface, a plurality of the plate fins arranged at intervals, a plurality of the side plates arranged at both ends or one end, and the length The refrigerant tube is passed through a hole, and the corrugated corrugation is applied in the step direction so that the ridge line is parallel to the column number direction on the surface of the plate fin and the side plate. Flat perimeter around the hole Forming a, and is obtained by forming a slender flat flat groove in the column direction.

  This improves side plate warpage and torsion in dog-bone heat exchangers, reduces ventilation resistance and increases side plate strength, eliminates bending and tearing, and increases rigidity as a heat exchanger Thus, the deformation can be improved, and a highly efficient and economical heat exchanger that takes into account the reliability of frosting and defrosting 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 improve the warping and twisting of the side plate in the dog bone type heat exchanger, reduce the ventilation resistance, and increase the strength of the side plate, so that bending and A high-efficiency and economical heat exchanger that improves deformation and eliminates tearing and improves rigidity as a heat exchanger and also considers the reliability of frosting and defrosting, and a cooling system using the heat exchanger 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 Plane BB sectional view of the heat exchanger in the first embodiment Front view of the side plate in the first embodiment Front view of another side plate in the first embodiment Front view of a side plate in Embodiment 2 of the present invention Front view of a side plate in Embodiment 3 of the present invention The schematic diagram of the cooling system in Embodiment 4 of this invention Front view of conventional heat exchanger Side view along the line AA of the heat exchanger Cross-sectional view of plane B-B of the heat exchanger Front view of conventional side plate

  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 plurality of long holes made of circular arc portions provided on both short sides of the rectangular portion on the plate surface, and at least four plate fins that are independent at least every two rows, and a plurality of the long holes are provided on the plate surface. A side plate having a plate width equal to or greater than a row is provided, a plurality of the plate fins are arranged at intervals, a plurality of the side plates are arranged at both ends or one end, and the refrigerant tube is passed through the long hole. The surface of the plate fin and the side plate is corrugated in the step direction so that the ridge line is parallel to the row number direction, and the flat perimeter of the slot is flat. Forms a seat and narrows in the step direction Ku is obtained by forming a flat flat groove.

  By adopting such a structure, the warp and twist of the side plate in the dog bone type heat exchanger are improved, the ventilation resistance is reduced, and the strength of the side plate is increased, so that bending and tearing are eliminated, and as a heat exchanger By improving the rigidity, it is possible to provide a highly efficient and economical heat exchanger in which deformation is improved and reliability of frost formation and defrosting is considered, and a cooling system using the heat exchanger.

  According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the flat groove is formed so as to be substantially perpendicular to the ridgeline of the corrugation.

  By adopting such a configuration, problems such as the side plate warping and twisting substantially disappearing and contact with adjacent fins can be solved without increasing the draft resistance, and the occurrence of uneven frost or the like is eliminated. The defrosting reliability is also improved, and a highly efficient and economical heat exchanger can be provided.

  According to a third aspect of the present invention, in the heat exchanger according to the second aspect, a flat groove is formed at an end portion of the side plate.

  By adopting such a configuration, if a flat groove is formed at the end of the side plate, it is difficult to prevent water droplets from dropping, so that the air passage is difficult to block during frost formation, and the cooling capacity is slowed down. In addition, it is possible to avoid clogging of frost and maintain the cooling performance after defrosting, realizing high reliability, and providing a highly efficient and economical heat exchanger.

  According to a fourth aspect of the present invention, in the heat exchanger according to the first aspect, the flat grooves are formed so as to be substantially perpendicular to the long holes arranged in a staggered manner.

  By adopting such a configuration, it is possible to solve the problem of preventing the side plate from twisting and dropping the water droplets at the same time by making the flat groove perpendicular to the long hole.

  Invention of Claim 5 is a cooling system provided with the compressor, the condenser, the decompression device, the evaporator, and the air blower forcibly ventilating the evaporator. It is a cooling system using the heat exchanger as described in any one as an evaporator.

  With this configuration, the cooling system has excellent energy saving characteristics, and a highly efficient and economical cooling system can be provided.

  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 of the heat exchanger taken along line AA in FIG. 1, and FIG. It is sectional drawing from the plane side of the same heat exchanger by -B line. 4 is a front view of a side plate in the first embodiment, and FIG. 5 is a front view of another side plate in the first embodiment.

  1, 2, and 3, the heat exchanger 1 includes a refrigerant tube 2 in which a refrigerant flows, a plurality of plate fins 3 arranged at predetermined intervals, and side plates 5 arranged at both ends. doing.

  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.

  Then, a plurality of long holes 4 formed in the plurality of plate fins 3 independent every two rows, and a plurality of long holes 4 formed in the side plate 5 having a plate width corresponding to the full width of the heat exchanger 1, The straight tube portion of the refrigerant tube 2 is in close contact with the plate fin 3 by passing through the bent tube portion of the refrigerant tube 2.

  4 and 5, the long hole 4 processed in the side plate 5 has a rectangular portion 4a and a circular arc portion 4b, and the circular arc portion 4b is formed in a long hole shape continuously on both short sides of the rectangular portion 4a. Has been. Further, a corrugated corrugation 6 is processed in the step direction on the surface of the side plate 5 so that the ridge line 6a is parallel to the column number direction, and a flat flat seat is formed in the peripheral portion of the long hole 4. 7 is formed, and a flat groove 8 that is elongated and flat in the step direction is also formed.

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

  First, the corrugated 6 processed on the surface of the side plate 5 has the ridge line 6a parallel to the column number direction, that is, parallel to the wind direction (Y direction). No.

  Further, the side plates 5 are arranged at both ends, and when the refrigerant tube 2 is passed through the long hole 4, the bent tube portion of the refrigerant tube 2 is used as a head, and is inserted from the base side of the collar that is burring around the long hole 4. However, in general, in order to improve the adhesion between the refrigerant tube 2 and the plate fin 3, the outer diameter of the refrigerant tube 2 and the inner diameter of the arc portion 4b of the long hole 4 are substantially the same, and the refrigerant tube 2 The heat exchanger 1 warps against the side plate 5 due to the straightness of the straight pipe portion or the accuracy of the angle and bending pitch of the refrigerant tubes 2 formed in a staggered manner, and the insertion resistance is not a little. It is the structure which is easy to generate | occur | produce and a twist. In addition, when the plate | board thickness of the side plate 5 is made thin, it will become the structure in which a curvature and a twist are easy to generate | occur | produce further. Therefore, the corrugate 6 is processed on the surface of the side plate 5 and the flat flat seat 7 is formed on the peripheral edge of the staggered long hole 4 and is connected to the flat seat 7 so as to be elongated in the step direction. By forming 8 as well, warping and twisting of the side plate 5 are improved, and bending and tearing are eliminated. Furthermore, by improving the rigidity of the heat exchanger 1, the deformation is improved, and a highly efficient and economical heat exchanger considering the reliability of frosting and defrosting and a cooling system using the heat exchanger are provided. can do.

That is, if the strength of the side plate 5 is low, warping, twisting, bending and tearing occur as described above, and the heat exchanger 1 is also deformed, so that the ventilation resistance is increased or every two rows are independent. An interval in the row direction of the plate fins 3 may be narrowed. Therefore, since a problem such as a decrease in heat exchange performance or uneven frost occurs and problems such as insufficient defrosting occur, it is necessary to increase the number of plates or increase the plate thickness in order to increase the strength of the side plate 5. Therefore, it is impossible to provide a highly efficient and economical heat exchanger considering the reliability of frosting / defrosting and a cooling system using the heat exchanger.

  As shown in FIG. 4, the flat groove 8 is connected to the flat seat 7 and aligned in a straight line and processed to the end of the side plate 5. However, as shown in FIG. 5, the flat groove 8 is straight. It is not necessary to line up on a line, and the side plate 5 of another form may be sufficient.

  As described above, by improving the warpage and twisting of the side plate in the dogbone heat exchanger, reducing the ventilation resistance and increasing the strength of the side plate, there is no bending or tearing, and rigidity as a heat exchanger By improving the above, it is possible to provide a highly efficient and economical heat exchanger that improves deformation and also takes into account the reliability of frosting and defrosting, and a cooling system using the heat exchanger.

(Embodiment 2)
FIG. 6 is a front view of a side plate in the second embodiment. 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 using the side plate 5 configured as described above will be described below.

  First, the flat groove 8 is formed to be substantially perpendicular to the ridge line 6 a of the corrugate 6, and the flat groove 8 is formed at the end of the side plate 5.

  When the corrugate 6 is processed on the surface of the side plate 5, the warp of the side plate 5 is limited to a certain direction. At the same time, by forming the flat seat 7 and the flat groove 8, the warpage is substantially eliminated and the problem of contacting the adjacent plate fin 3 is solved. Furthermore, if the flat groove 8 is formed at the end of the side plate 5, the structure is unlikely to hinder the drop of water droplets. Therefore, it is difficult to block the air passage during frost formation, and the cooling capacity is slowed down. In addition, it is possible to avoid clogging of frost and maintain the cooling performance after defrosting, realizing high reliability, and providing a highly efficient and economical heat exchanger.

(Embodiment 3)
FIG. 7 is a front view of a side plate in the third embodiment. 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 using the side plate 5 configured as described above will be described below.

  First, the flat grooves 8 are formed so as to be substantially perpendicular to the long holes 4 arranged in a staggered manner. Then, the long holes 4 are arranged obliquely at a fixed angle with respect to the side plate 5, and are also arranged obliquely with respect to the ridge line 6 a of the corrugated 6. Therefore, it is possible to apply a stress to the side plate 5 in a direction that cancels a state in which the long hole 4 and the side plate 5 are likely to be stressed obliquely. Therefore, by making the flat groove 8 perpendicular to the long hole 4, it is possible to simultaneously solve the plate fin twist prevention and the water drop dropping property.

(Embodiment 4)
FIG. 8 is a schematic diagram of a cooling system according to 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 any one of the first to third embodiments as the evaporator 12.

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

  Since the heat exchanger according to the present invention and the cooling system using the heat exchanger have high cost performance in consideration of the reliability of frosting and defrosting, refrigeration equipment for household use to industrial use such as refrigerators and vending machines. It can be widely used as a cooler or heat radiator.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Refrigerant tube 3 Plate fin 4 Long hole 4a Rectangular part 4b Arc part 5 Side plate 6 Corrugate 6a Ridge line 7 Flat seat 8 Flat groove 9 Compressor 10 Condenser 11 Decompression device 12 Evaporator 13 Blower

Claims (5)

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 side plate having a plate width of at least four rows or more, in which a plurality of long holes made of circular arc portions are provided on the plate surface, and at least two rows of independent plate fins, and a plurality of the long holes are provided on the plate surface. A heat exchanger in which a plurality of the plate fins are arranged at intervals, a plurality of the side plates are arranged at both ends or one end, and the refrigerant tube is penetrated through the long hole. Corrugated corrugation is applied in the step direction so that the ridge line is parallel to the row number direction on the surface of the fin and the side plate, and a flat flat seat is formed on the periphery of the long hole, and A flat groove that is elongated in the step direction. Heat exchanger, characterized in that the formed. The heat exchanger according to claim 1, wherein the flat groove is formed so as to be substantially perpendicular to a ridgeline of the corrugate. The heat exchanger according to claim 2, wherein the flat groove is formed at an end of the side plate. The heat exchanger according to claim 1, wherein the flat groove is formed to be substantially perpendicular to the long holes arranged in a staggered manner. The heat exchange according to any one of claims 1 to 4, wherein the cooling system includes a compressor, a condenser, a decompression device, an evaporator, and a blower for forcibly ventilating the evaporator. A cooling system characterized by using an evaporator as an evaporator.