JP5938565B2 - Heat exchanger and cooling system and refrigerator using the same - Google Patents

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, a cooling system using the same, and a refrigerator. is there.

  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 type heat exchangers (see, for example, Patent Document 1 and Patent Document 2).

  10 to 12 show a conventional heat exchanger described in Patent Document 1 described above.

  FIG. 13 shows a conventional heat exchanger described in Patent Document 2.

  The conventional heat exchanger 101 has a configuration in which a straight tube portion and a bent tube portion are continuously bent in a meandering manner at a predetermined pitch and a plate fin provided with a plurality of long holes 104 on a plate surface. 103, a plurality of the plate fins 103 are arranged at intervals, and the refrigerant tube 102 is passed through the long hole 104. In the plate fin 103, the length of the rectangular portion of the long hole 104 is The color molding portions 104b that can be cut and raised are provided on both sides in the hand direction.

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

  First, regarding the heat exchanger 101 using the plate fin 103 of FIG. 12, when the refrigerant tube 102 is inserted into the long hole 104 of the plate fin 103 of FIG. The molded part 104b is elastically deformed, and after passing through the R part, it returns to its original flat state or its intermediate state by elasticity. Therefore, since the area of the rectangular part of the long hole 104 can be made as small as possible, the heat transfer area is increased and the performance of the heat exchanger is improved.

  Next, the heat exchanger 101 using the plate fins 103 of FIG. 13 is obtained by integrally forming a rectangular end collar 104b and an arcuate collar 104a in a long hole 104 by burring. Also in this case, since the area of the rectangular portion of the long hole 104 can be reduced as much as possible, the heat transfer area is increased and the performance of the heat exchanger is improved.

Japanese Patent No. 2811601 JP 2002-243382 A

  However, in the conventional configuration of Patent Document 1, when the refrigerant tube 102 is inserted into the long hole 104 of the plate fin 103, the collar molding portion 104b is elastically deformed when the bent R portion of the refrigerant tube 102 passes, and the R In order to return to the original flat state or the intermediate state with elasticity after the passage, the plate fin 103 needs to have a certain degree of strength, and generally needs to have a large plate thickness. That is, in the conventional patent document 1, the reason why the color molding part does not exist in the arc part of the long hole 104 is that the plate fin 103 is considered to have a large thickness, and it is not necessary to dare to attach the color molding part. Seem. Therefore, since the plate thickness of the plate fin 103 cannot be reduced, there is a problem that the material cost increases.

  Moreover, in the structure of the conventional patent document 2, since the rectangular portion end collar 104b and the arc portion collar 104a are integrally formed in the elongated hole 104 by burring processing, at first glance, the arc portion and the rectangular portion can be processed once at a time. Although it seems that the mold is cheaper, the tip of the arc part is a process in which the material is stretched, and the tip of the rectangular part is a process in which the material is not stretched. In addition, it is necessary to devise the mold, and it becomes difficult in terms of workability. Furthermore, when the heat exchanger 101 is used as an evaporator, water droplets are likely to accumulate at the joint between the arcuate collar 104a and the rectangular collar 104b, and of course the cooling performance at the time of wet start after defrosting is lowered. In addition, there was a problem that it could be a cause of uncooling due to frost clogging.

  The present invention solves the above-mentioned conventional problems, and in order to effectively utilize the heat transfer area of the long holes of the plate fins in the dog bone type heat exchanger, it is highly efficient considering the reliability of frosting and defrosting. It is another object of the present invention to provide an economical heat exchanger and a cooling system using the heat exchanger.

In order to solve the above conventional problems, a heat exchanger according to the present invention includes a refrigerant tube in which a straight pipe portion and a bent pipe portion are continuously bent in a meandering manner, a rectangular portion, and short sides on both sides of the rectangular portion. A plate fin provided with a plurality of long holes made of circular arc portions provided on the plate surface, and a plurality of the plate fins arranged with a space between each other, and the refrigerant tube penetrated through the long hole a exchanger, in said plate fins, a collar cut and raised with respect to one surface of the plate fins on one side and the arcuate portion in the longitudinal direction of the rectangular part is provided, of the collar, it is shaped in the rectangular portion a rectangular collar which is inclined with respect to the air flow passing through the heat exchanger, and a circular arc portion collar molded to the arc portion, is divided, the height of the rectangular section collar, high of the arcuate collar It is higher than that.

Thus, when the refrigerant tube is inserted, when the R portion of the refrigerant tube passes through the long hole, it does not come into contact with the collar forming portion of the long hole rectangular portion, and the plate thickness is increased in order to increase the strength of the plate fin. There is no need to increase the size. In addition, in order to integrally form the rectangular hole collar and arcuate collar of the long hole, the elasticity of the plate fins is required, and it is difficult to process with a thin product. Therefore, the processability of color molding becomes easy. In addition, water droplets are less likely to accumulate at the joint between the arc and rectangular collars, so the heat transfer area of the long holes of the plate fins can be used effectively, as well as avoiding clogging of frost and cooling after defrosting. Performance can be maintained, and high reliability can be realized, and a highly efficient and economical heat exchanger, a cooling system using the heat exchanger, and a refrigerator can be provided.
Moreover, by setting it as such a structure, since the fin raw material of a long hole rectangular part can be utilized more effectively and a heat-transfer area increases, performance improves. Further, by increasing the color height of the rectangular portion, the performance is improved by the boundary layer leading edge effect and the turbulent flow promoting effect. Therefore, a high-performance heat exchanger can be provided.

  The heat exchanger of the present invention and the cooling system and refrigerator using the heat exchanger can effectively utilize the heat transfer area of the long holes of the plate fins in the dog bone type heat exchanger, as well as the reliability of frosting and defrosting. It is possible to provide a highly efficient and economical heat exchanger in consideration of the above, a cooling system and a refrigerator using the heat exchanger.

Side view of heat exchanger in Embodiment 1 of the present invention Front view of heat exchanger in embodiment 1 The perspective view of the plate fin in Embodiment 1 Sectional drawing of the plate fin in Embodiment 1 The perspective view of the plate fin in Embodiment 2 of this invention Sectional drawing of the plate fin in Embodiment 2 Plate fin part expansion perspective view of the heat exchanger in Embodiment 3 of this invention Plate fin part expansion perspective view of the heat exchanger in Embodiment 3 The schematic diagram of the cooling system in Embodiment 4 of this invention Side view of conventional heat exchanger Front view of the heat exchanger A perspective view of a conventional plate fin A perspective view of a conventional plate fin

The invention according to claim 1 is a long hole comprising a refrigerant tube in which a straight pipe part and a curved pipe part are continuously bent in a meandering manner, and a rectangular part and arc parts provided on both short sides of the rectangular part. A plurality of plate fins provided on a plate surface, the plurality of plate fins being arranged with a space between each other, and the refrigerant tubes being inserted through the elongated holes, wherein the plate fins in the color cut and raised with respect to one surface of the plate fins on one side and the arcuate portion in the longitudinal direction of the rectangular part is provided, of the collar, is shaped in the rectangular section, it passes through the heat exchanger air a rectangular collar which is inclined with respect to the flow, an arc collar molded to the arc portion, is divided, the height of the rectangular section collar is higher than the height of the arcuate collar.

With this configuration, when the refrigerant tube is inserted, when the R portion of the refrigerant tube passes through the long hole, it does not come into contact with the color molding portion of the long hole rectangular portion, and the strength of the plate fin is increased. Therefore, it is not necessary to increase the plate thickness. In addition, in order to integrally form the rectangular hole collar and arcuate collar of the long hole, the elasticity of the plate fins is required, and it is difficult to process with a thin product. Therefore, the processability of color molding becomes easy. In addition, water droplets are less likely to accumulate at the joint between the arc and rectangular collars, so the heat transfer area of the long holes of the plate fins can be used effectively, as well as avoiding clogging of frost and cooling after defrosting. Performance can be maintained, and high reliability can be realized, and a highly efficient and economical heat exchanger can be provided.
Moreover, by setting it as such a structure, since the fin raw material of a long hole rectangular part can be utilized more effectively and a heat-transfer area increases, performance improves. Further, by increasing the color height of the rectangular portion, the performance is improved by the boundary layer leading edge effect and the turbulent flow promoting effect. Therefore, a high-performance heat exchanger can be provided.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the rectangular portion collar and the circular arc portion collar make it difficult for water droplets to accumulate at a joint portion of the rectangular portion collar and the circular arc portion collar. Therefore, it is divided .

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect , when the plate fin is installed vertically, an angle formed by a straight line extending the rectangular portion collar with respect to the vertical line is 45 degrees or less and 0 degrees or more.

  With this configuration, when used as an evaporator, water drops at the time of defrosting are likely to flow down, making it difficult for water drops to accumulate, making it difficult to block the air path during frost formation, and slowing down the cooling capacity. . 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 any one of the first to third aspects, the refrigerant tube is made of aluminum or an aluminum alloy.

According to a fifth aspect of the present invention, in the heat exchanger according to any one of the first to fourth aspects, the plate fin has a gap between the plate fins positioned on the upstream side in the refrigerant flow direction. It is wider than the interval between the plate fins located on the downstream side.

The invention according to claim 6 is the heat exchanger according to any one of claims 1 to 5 , wherein at least one of the plate fins passes through all straight pipe portions. It is.

Invention according to claim 7, a compressor, a condenser, a pressure reducing device, an evaporator, in the cooling system and a blower that forces air into the evaporator, of claims 1 to 6 It is a cooling system using the heat exchanger as described in any one as an evaporator.

Invention of Claim 8 is a refrigerator which cools the inside of a store | warehouse | chamber by the cooling system of Claim 7 , and is equipped with a defrost means and defrosts an evaporator.

  With this configuration, the cooling system and the refrigerator have excellent energy saving characteristics, and a highly efficient and economical cooling system and refrigerator 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 side view of a heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is a front view of the heat exchanger, FIG. 3 is a perspective view of a plate fin, and FIG. It is sectional drawing from the side surface of the same plate fin by A line.

  1, 2, 3, and 4, 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 refrigerant tube 2 has a meandering shape in which a single pipe body made of aluminum or an aluminum alloy has a straight pipe portion and a curved pipe portion that are continuous in a row (left and right) direction X and a step (up and down) direction Y. The serpentine tube is bent into a single, and one refrigerant flow path is formed 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 which contact | adhered to 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. FIG.

  The long hole 4 has a rectangular part and a circular arc part, and is formed in a long hole shape in which the circular arc part is continuously formed on both short sides of the rectangular part. Further, the arc portion is provided with an edge-shaped arc portion collar 4a for tightly fixing to the straight pipe portion of the refrigerant tube 2, and the edge portion is formed substantially vertically at both ends in the longitudinal direction of the rectangular portion. The rectangular portion collar 4b is provided.

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

  First, when the refrigerant tube 2 and the plurality of plate fins 3 are assembled, the bent tube portion of the refrigerant tube 2 is inserted into the long hole 4 of the plate fin 3 and passes therethrough. Since the rectangular portion collar 4b of the long hole 4 is edged and formed substantially perpendicularly, the bent tube portion of the refrigerant tube 2 can pass through without contacting the rectangular portion collar 4b. If the rectangular portion collar 4b is not erected, it passes through the rectangular portion collar 4b when the bent tube portion of the refrigerant tube 2 passes, and the plate fin 3 is increased in thickness. It cannot be inserted unless the strength is increased. Therefore, material rationalization such as reducing the plate thickness of the plate fin 3 becomes possible.

  In general, the bent tube portion of the refrigerant tube 2 is flattened and sized to be inserted into the width of the rectangular portion of the long hole 4. After the refrigerant tube 2 and the plurality of plate fins 3 are assembled, When the diameter of the refrigerant tube 2 is increased by a hydraulic expansion pipe or the like and is fixed in close contact with the plurality of plate fins 3, the flatness is restored to the original diameter.

  Further, in order to integrally mold the rectangular portion collar 4b and the arc portion collar 4a of the long hole 4, it is necessary to have elasticity of the plate fins, and it is difficult to process with a thin product, so the rectangular portion collar 4b and the arc portion collar 4a. Since it is divided, processing becomes easy, and similarly, material rationalization such as reducing the plate thickness of the plate fin 3 becomes possible.

  In addition, since the rectangular portion collar 4b and the arc portion collar 4a are divided, it is difficult for water droplets to accumulate at the joint portion between the arc portion collar 4a and the rectangular portion collar 4b. When water droplets accumulate, during cooling operation, frost grows and enlarges with the water droplets as the core, reaches the adjacent plate fin 3 and accelerates the time for closing the air passage. As a result, the cooling capacity is lowered and it cannot be cooled. Furthermore, even if the defrosting is performed, the frost may not be thawed. By repeating this, the frost changes to ice, and the entire heat exchanger becomes a lump of ice and does not completely cool. Therefore, not only can the heat transfer area lost due to the long holes 4 of the plate fins 3 be used effectively, it is possible to avoid clogging of frost and maintain the cooling performance after defrosting, realizing high reliability. A highly efficient and economical heat exchanger can be provided.

  Further, as shown in FIG. 3, the height Hb of the rectangular portion collar 4b of the elongated hole 4 and the height Ha of the arc portion collar 4a of the elongated hole 4 are made equal to each other, It becomes easy to burring the rectangular collar 4b at the same time. When the collar height is the same, the frictional resistance between the burring type punch die and the plate fin material can be made equal in the arc portion and the rectangular portion. Therefore, the processing balance of the mold is improved, and the mold life is extended. Therefore, an inexpensive heat exchanger can be provided.

  Moreover, as shown in FIGS. 1 and 3, by setting the angle θ of the rectangular portion collar 4 b in the longitudinal direction of the long hole 4 to 45 degrees or less with respect to the installation vertical direction of the heat exchanger 1, the evaporator When used as a water droplet, the water droplets at the time of defrosting are likely to flow down, so that the water droplets are less likely to accumulate, the air passage is not easily blocked at the time of frost formation, and a reduction in cooling capacity can be suppressed. 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 2)
FIG. 5 is a perspective view of the plate fin in the second embodiment, and FIG. 6 is a cross-sectional view from the side of the plate fin taken along line BB in FIG. The same constituent elements as those in the first embodiment will be described with the same reference numerals.

  In the plate fin 3 shown in FIGS. 5 and 6, the height Hb of the rectangular portion collar 4 b of the elongated hole 4 is made higher than the height Ha of the arc portion collar 4 a of the elongated hole 4.

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

  First, the height Hb of the rectangular portion collar 4b of the long hole 4 is set higher than the height Ha of the arc portion collar 4a of the long hole 4, so that the fin of the rectangular portion that is press-cut when the long hole 4 is formed. The material can be used effectively to the limit. Therefore, since the heat transfer area increases, the performance is improved. In addition, the amount of material scrap can be reduced and resources can be used effectively.

  Further, by increasing the height Hb of the rectangular portion collar 4b, when the air passing through the heat exchanger 1 passes through the rectangular portion collar 4b, a boundary layer leading edge effect and a turbulent flow promoting effect are generated. Will improve. Therefore, a high-performance heat exchanger can be provided.

(Embodiment 3)
7 and 8 are enlarged perspective views of a plate fin portion of the heat exchanger according to the third embodiment. That is, the straight tube portion and the bent tube portion are continuously provided with a refrigerant tube 2 bent in a meandering manner at a predetermined pitch, and a plate fin 3 having a plurality of long holes 4 provided on the plate surface. A plurality of plate fins 3 are extracted from the heat exchanger 1 that is arranged with a space between each other and the refrigerant tubes 2 are passed through the long holes 4, and is shown in an enlarged perspective view.

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

  As shown in FIG. 7, the collar 4 b that is cut and raised at both ends in the longitudinal direction of the rectangular portion of the long hole 4 is forcibly bent back after passing through the refrigerant tube 2 to be a horizontal plane equivalent to the plane of the plate fin 3. is there. Thereby, the installation vertical direction of the heat exchanger and the rectangular collar 4b are substantially parallel, that is, approximately parallel to each other, and when used as an evaporator, water drops during defrosting are clearly not accumulated. As a result, if the heat exchanger installation vertical direction is parallel to the plane of the fins, the installation of the defrosting water will not result in the composition of the defrost water being installed obliquely or sideways. Therefore, a design that is not influenced by the defrosting water falling direction and the wind direction is possible.

  As shown in FIG. 8, the collar 4 b that is cut and raised at one end in the longitudinal direction of the rectangular portion of the long hole 4 is forcibly bent back after passing through the refrigerant tube 2 to be a horizontal plane equivalent to the plane of the plate fin 3. Also good. It is easier to bend back when the collar is molded at one end than at both ends of the rectangular portion.

(Embodiment 4)
FIG. 9 is a schematic diagram of a cooling system according to the fourth embodiment. The present cooling system includes a compressor 5, a condenser 6, a decompression device 7, an evaporator 8, and a blower 9 that forcibly ventilates the evaporator 8. A cooling system using the heat exchanger according to any one of claims 1 to 5 as the evaporator 8.

  In addition, the interior of the refrigerator is cooled by the cooling system and is equipped with a defrosting means (defrosting heater) to defrost the evaporator and is configured as the evaporator so that water droplets at the time of defrosting are not clearly collected. It is a refrigerator that can improve the efficiency and heat exchange of defrosting.

  The heat exchanger described above can effectively utilize the heat transfer area of the long holes of the plate fins in the dog bone type heat exchanger, and also has a high efficiency and economical effect considering the reliability of frosting and defrosting. By having this cooling system and a refrigerator using the cooling system, the energy-saving characteristics are improved, and a highly efficient and economical cooling system and a refrigerator using the cooling system can be provided. .

  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 Arc part color | collar 4b Rectangular part color | collar 5 Compressor 6 Condenser 7 Depressurizer 8 Evaporator 9 Blower 10 Defrost means

Claims (8)

A straight tube portion and a bent tube portion continuously bent into a meandering shape; and
A plate fin provided with a plurality of long holes formed on the plate surface, the rectangular portion and a circular arc portion provided on both short sides of the rectangular portion;
A plurality of the plate fins arranged with a space between each other, and the heat exchanger having the elongated tube penetrated through the refrigerant tube,
In the plate fin, a collar cut and raised with respect to one surface of the plate fin is provided on one side in the longitudinal direction of the rectangular portion and the arc portion, and the heat exchanger is formed on the rectangular portion of the collar. The rectangular part collar inclined with respect to the passing air flow and the arc part collar formed on the arc part are divided,
The heat exchanger according to claim 1, wherein a height of the rectangular portion collar is higher than a height of the arc portion collar. 2. The heat exchanger according to claim 1, wherein the rectangular portion collar and the arc portion collar are divided in order to make it difficult for water droplets to collect at a joint portion between the rectangular portion collar and the arc portion collar. When the said plate fin is installed vertically, the angle which the straight line which the said rectangular part collar extends | stretches with respect to a perpendicular is 45 degrees or less and 0 degree or more, The Claim 1 or 2 characterized by the above-mentioned. Heat exchanger. The heat exchanger according to any one of claims 1 to 3 , wherein the refrigerant tube is made of aluminum or aluminum alloy. The plate fins, the spacing of the plate fins between which is located on the upstream side of the flow direction of the refrigerant, claim 1, wherein the wider spacing of plate fins each other located downstream to any one of the 4 The described heat exchanger. The heat exchanger according to any one of claims 1 to 5 , wherein at least one of the plate fins passes through all straight pipe portions. In the cooling system provided with the compressor, the condenser, the decompression device, the evaporator, and the blower for forcibly ventilating the evaporator, the heat exchanger according to any one of claims 1 to 6 is provided. A cooling system used as the evaporator. The refrigerator which cools the inside of a store | warehouse | chamber by the cooling system of Claim 7 , and is equipped with a defrost means and performs the defrost of the said evaporator.

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