JP2011202855A - Refrigerator - Google Patents

Abstract

A highly efficient and economical refrigerator is provided by installing a cooler that effectively uses a heat transfer area of a long hole portion of a dogbone type plate fin in an air passage.
A refrigerant tube 2 bent in a meandering manner at a predetermined pitch so that a plurality of rows and steps are continuously formed in a staggered manner in a straight pipe portion and a curved pipe portion, and a long hole 4 is formed on a plate surface. A plurality of plate fins 3 and color forming portions (rectangular portion collar 4b, arc portion collar 4a) cut and raised substantially perpendicularly to the surface of the plate fin 3 in the longitudinal direction of the rectangular portion of the long hole 4. The refrigerator includes a cooler 1 in which a plurality of plate fins 3 are spaced apart from each other, and a refrigerant tube 2 is passed through a long hole 4 and an air passage 5 in which the cooler 1 is disposed, As the shape of the bypass air passages 5a and 5b that bypass a part of the cross section side of the cooler 1 of the air passage 5, with respect to the wind direction passing through the cooler 1, the bypass air passage 5b on the inclined direction side of the long hole 4 The bypass air passage 5a on the inclined reverse direction side is lengthened.
[Selection] Figure 4

Description

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

  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 the cooler. On the other hand, since these coolers frost, it is common to devise the air passage on the refrigerator side to be used so that cooling performance can be secured even if frost is formed.

  As an example of a cooler, a serpentine-shaped 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, resulting in high efficiency. A dock bone type heat exchanger having elements is known (see, for example, Patent Document 1 and Patent Document 2).

  In addition, as an example of a refrigerator including an air passage in which a cooler is disposed, a refrigerator provided with a bypass air passage that bypasses a part of the cross section of the air passage cooler is known (for example, Patent Document 3). , See Patent Document 4).

  FIG. 8 shows the side and front of a conventional refrigerator cooler disclosed in Patent Document 1 and Patent Document 2. FIG. 9 is a perspective view of a plate fin of the cooler of the conventional refrigerator. FIG. 10 is a cross-sectional view showing the air path around the cooler of the conventional refrigerator disclosed in Patent Document 3 and Patent Document 4.

  The structure of the conventional refrigerator cooler 101 is a plate fin in which a straight tube portion and a bent tube portion are continuously bent in a meandering manner at a predetermined pitch, and a plurality of long holes 104 are provided on the plate surface. 103, a plurality of 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 rectangular part of the long hole 104 is disposed on both sides in the longitudinal direction. The cut and raised color molding portion 104b is provided.

  The operation of the conventional refrigerator cooler 101 configured as described above will be described below.

  First, the cooler 101 using the plate fin 103 of FIG. 9 is obtained by integrally forming a rectangular end collar 104b and an arcuate collar 104a in a long hole 104 by burring. 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, in the refrigerator cooler shown in FIG. 10 and the surrounding air passage, air flows from the lower direction to the upper direction. The air path 105 has a width larger than the cooler width below the cooler 101 and is in a state in which the air flow bypasses the cooler 101. Since the width is substantially the same as the width, the bypassed air flow is in a state of converging on the cooler 101 side.

  As the cooling proceeds, frosting progresses from below the cooler 101, and even if the lower part of the cooler 101 is blocked by frosting, the air is bypassed by a wide air passage width, thereby extending the coolable time of the cooler 101. There is an aim. Further, the fact that the bypass is not performed above the cooler 101 has a role of preventing damp air flowing from the lower side of the cooler 101 from flowing behind the cooler 101 and frosting in the refrigerator.

Japanese Patent No. 2811601 JP 2002-243382 A Japanese Patent No. 3871012 Japanese Patent Laid-Open No. 60-101471

  However, in the configuration of the conventional refrigerator cooler 101 and the surrounding air passage 105, the rectangular portion end collar 104b and the arc portion collar 104a are integrally formed in the long hole 104 by burring, and the rectangular portion of the long hole 104 is elongated. Since both sides of the direction are cut and raised substantially perpendicularly to the surface of the plate fin 103, the elongated hole 104 is inclined with respect to the wind direction, so that the cut and raised color molding portion tends to deflect the wind direction.

  Therefore, air tends to flow from the bypass air passage 105b on the inclined direction side of the elongated hole 104 to the bypass air passage 105a on the opposite side of the inclined direction with respect to the air direction passing through the cooler 101, and the air volume balance is not uniformized. Therefore, the frosting tolerance was reduced, the performance of the cooler 101 was also lowered, and the energy efficiency of the refrigerator was reduced.

  The present invention solves the above-mentioned conventional problems, and a cooler that effectively uses the heat transfer area of the long hole portion of the dogbone type plate fin is installed in an optimal air passage to prevent frosting and defrosting. An object of the present invention is to provide a highly efficient and economical refrigerator in consideration of reliability.

  In order to achieve the above object, the refrigerator of the present invention is a refrigerant in which a straight pipe part and a curved pipe part are bent in a meandering manner at a predetermined pitch so that a plurality of rows and stages are formed in a staggered manner. A plate, a plate fin provided with a plurality of long holes on the plate surface, and a color molding portion cut and raised substantially perpendicularly to the plate fin surface in the longitudinal direction of the rectangular portion of the long hole. And a cooling device in which the refrigerant tube is passed through the elongated hole, and an air passage for disposing the cooling device, wherein the cooling of the air passage As a bypass air passage shape that bypasses a part of the cross section side of the vessel, the bypass air passage on the inclined reverse direction side is longer than the bypass air passage on the inclined direction side of the elongated hole with respect to the air direction passing through the cooler. It is a thing.

  Further, another refrigerator of the present invention comprises 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 long tube A plate fin provided with a plurality of holes on the plate surface; and a color molding portion cut and raised substantially perpendicular to the plate fin surface in the longitudinal direction of the rectangular portion of the elongated hole, and the plate fins are mutually connected. A refrigerator comprising a cooler that is arranged with a gap and has the refrigerant tube penetrated through the long hole, and an air passage in which the cooler is arranged, wherein the air passage has a cross-sectional side of the cooler As the shape of the bypass air passage that bypasses a part of the air passage, the bypass air passage on the inclined direction side of the elongated hole is eliminated with respect to the air direction passing through the cooler, and the bypass air passage is provided only on the inclined reverse direction side. It is.

  Thereby, air volume balance can be made uniform. Therefore, since the performance of the cooler can be improved while maintaining the frosting resistance, a more energy-saving refrigerator can be provided.

  In the refrigerator of the present invention, a cooler that effectively utilizes the heat transfer area of the long hole portion of the dogbone type plate fin is installed in an optimum air passage, and is highly efficient in consideration of the reliability of frost formation and defrosting. An economical refrigerator can be provided.

(A) Side view of the refrigerator cooler in Embodiment 1 of the present invention (b) Front view of the refrigerator cooler in the same embodiment The perspective view of the plate fin of the refrigerator cooler of the embodiment AA sectional view of FIG. Sectional drawing which shows the air path around the cooler of the refrigerator of the embodiment The schematic diagram which showed the air volume distribution of the air path around the cooler of the refrigerator of the embodiment The schematic diagram which showed the air volume distribution of another example of the air path around the cooler of the refrigerator of the embodiment The schematic diagram which showed the air volume distribution of another example of the air path around the refrigerator cooler of the embodiment (A) Side view of a conventional refrigerator cooler disclosed in Patent Document 1 and Patent Document 2 (b) Front view of the conventional refrigerator cooler The perspective view of the plate fin of the refrigerator of the conventional refrigerator disclosed by patent document 1 and patent document 2 Sectional drawing which shows the air path around the cooler of the conventional refrigerator disclosed by patent document 3 and patent document 4

  A first aspect of the present invention relates to a refrigerant tube which is bent in a meandering manner at a predetermined pitch so that a plurality of rows and steps are continuously formed in a staggered manner in a straight pipe portion and a curved pipe portion, and a long hole is formed on a plate surface. A plurality of plate fins, and a color molding portion cut and raised substantially perpendicularly to the plate fin surface in the longitudinal direction of the rectangular portion of the elongated hole, and the plate fins are spaced apart from each other. A refrigerator having a refrigerant passage through which the refrigerant tube penetrates the long hole, and an air passage for disposing the cooler, wherein a portion of the air passage on the cross-sectional side of the cooler is provided. In the refrigerator, characterized in that the bypass air passage on the inclined reverse direction side is longer than the bypass air passage on the inclined direction side of the long hole as the shape of the bypass air passage to bypass the air direction passing through the cooler is there.

  In the above configuration, the cut-and-raised collar molding part compensates the tendency of deflecting the wind direction, and the bypass air path on the inclined reverse side is made longer than the bypass air path on the inclined direction side of the long hole with respect to the wind direction, so that the air volume balance Can be made uniform. Therefore, since the performance of the cooler can be improved while maintaining the frosting resistance, a more energy-saving refrigerator can be provided.

  According to a second 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 straight pipe portions and curved pipe portions are continuously formed, and a long hole is formed on a plate A plurality of plate fins, and a color molding portion cut and raised substantially perpendicularly to the plate fin surface in the longitudinal direction of the rectangular portion of the elongated hole, and the plate fins are spaced apart from each other. A refrigerator having a refrigerant passage through which the refrigerant tube penetrates the long hole, and an air passage for disposing the cooler, wherein a portion of the air passage on the cross-sectional side of the cooler is provided. As a bypass air passage shape, the bypass air passage on the inclined direction side of the elongated hole is eliminated with respect to the air direction passing through the cooler, and the bypass air passage is provided only on the inclined reverse direction side. It is a refrigerator.

  In the above configuration, the cut-and-raised collar molding part compensates the tendency of the wind direction to be deflected, and the bypass air passage on the inclined direction side of the long hole is eliminated with respect to the air direction passing through the cooler, and the bypass air passage is provided only on the inclined reverse direction side. By providing the air volume balance can be made more uniform. Therefore, since the performance of the cooler can be improved while maintaining the frosting resistance, a more energy-saving refrigerator can be provided.

  In a third aspect of the invention, in particular, in the second aspect of the invention, the opening width on the windward side of the bypass air passage is widened, and the opening width is gradually narrowed toward the leeward side.

  In the above configuration, the cut-and-raised color molding part compensates for the tendency to deflect the wind direction, widening the opening width on the windward side of the bypass air passage, and gradually reducing the opening width toward the leeward side, Furthermore, the air volume balance can be made more uniform. Therefore, since the performance of the cooler can be improved while maintaining the frosting resistance, a more energy-saving 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)
FIG. 1A is a side view of a refrigerator cooler according to Embodiment 1 of the present invention, and FIG. 1B is a front view of the refrigerator cooler according to the embodiment. 2 is a perspective view of a plate fin of the refrigerator cooler of the embodiment, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 4 is a cross-sectional view showing the air path around the cooler of the refrigerator according to the embodiment, and FIG. 5 is a schematic diagram showing the air volume distribution around the air cooler around the refrigerator according to the embodiment. FIG. 6 is a schematic diagram showing the air volume distribution of another example of the air path around the refrigerator cooler of the embodiment, and FIG. 7 is still another air path around the refrigerator cooler of the embodiment. It is the schematic diagram which showed air volume distribution of the example of.

  As shown in FIGS. 1 to 3, a refrigerator cooler 1 in the present embodiment includes a refrigerant tube 2 in which 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 portion and a circular arc portion, and is formed in a long hole shape in which the circular arc portions are continuously formed on both short sides of the rectangular portion. 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 refrigerator cooler 1 of this Embodiment 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 is 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 expanded by a hydraulic expansion pipe or the like and is fixed in close contact with the plurality of plate fins 2, the flatness is restored to the original diameter.

  Further, the rectangular portion collar 4b and the arc portion collar 4a may be divided. In order to integrally mold the rectangular collar 4b of the long hole 4 and the arcuate collar 4a, the plate fins need to be stretchable, and it is difficult to work with thin-walled products. By doing so, 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.

  As shown in FIGS. 4 and 5, the shape of the bypass air passages 5 a and 5 b that bypass a part of the cross section side of the cooler 1 of the air passage 5 is a long hole with respect to the wind direction passing through the cooler 1. The bypass air passage 5a on the side opposite to the inclination is made longer than the bypass air passage 5b on the side of the inclination direction 4.

  In the present embodiment, the straight tube portion and the curved tube portion are continuously bent into a meandering shape at a predetermined pitch so that a plurality of rows and steps are formed in a staggered manner, and the long holes 4 are provided. A plurality of plate fins 3 provided on the plate surface, and color forming portions (rectangular portion collar 4b, arc portion collar 4a) cut and raised substantially perpendicularly to the surface of the plate fin 3 in the longitudinal direction of the rectangular portion of the long hole 4 A refrigerator having a plurality of plate fins 3 arranged at intervals, a cooler 1 in which a refrigerant tube 2 is passed through a long hole 4, and an air passage 5 in which the cooler 1 is placed. Thus, as the shape of the bypass air passages 5a and 5b that bypass part of the cross section side of the cooler 1 of the air passage 5, the bypass air passage 5b on the inclined direction side of the long hole 4 with respect to the air direction passing through the cooler 1 Accordingly, the bypass air passage 5a on the inclined reverse direction side is lengthened.

  By adopting the above-described configuration, the cut and raised collar molding portion 4b compensates for the tendency of deflecting the wind direction, and the bypass air passage 5a on the opposite side of the inclination is bypassed from the bypass air passage 5b on the inclination direction side of the long hole 4 with respect to the air direction. By making it longer, the air volume balance can be made uniform. Therefore, since the performance of the cooler 1 can be improved while maintaining the frost proof strength, a more energy-saving refrigerator can be provided.

  In the present embodiment, the bypass air passage 5a on the side opposite to the inclined direction is made longer than the bypass air passage 5b on the inclined direction side of the long hole 4 with respect to the wind direction. The same effect can be obtained even if the opening width of the bypass air passage 5a on the opposite side of the inclination is wider than the bypass air passage 5b on the inclination direction side.

  Further, as shown in FIG. 6, even if the bypass air passage 5b on the inclined direction side of the long hole 4 is eliminated with respect to the air direction passing through the cooler 1, the bypass air passage 5a is provided only on the inclined reverse direction side. The effect is obtained.

  Further, as shown in FIG. 7, with respect to the wind direction passing through the cooler 1, the bypass air passage 5b on the inclined direction side of the long hole 4 is eliminated, and the bypass air passage 5a is provided only on the opposite side of the inclined direction. The same effect can be obtained even if the opening width on the windward side of the path 5a is increased and the opening width is gradually reduced toward the leeward side.

  As described above, according to the present invention, a cooler that effectively uses the heat transfer area of the long hole portion of the dogbone type plate fin is installed in an optimum air passage, and the reliability of frosting / defrosting is considered. An efficient and economical refrigerator can be provided, and can be applied to a home or commercial refrigerator, a showcase, and the like.

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 Air path 5a Bypass air path 5b Bypass air path

Claims (3)

Refrigerant tubes 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 straight pipe portions and curved pipe portions are continuously formed, and plate fins provided with a plurality of long holes on the plate surface And a color molding part cut and raised substantially perpendicularly to the plate fin surface in the longitudinal direction of the rectangular part of the long hole, and a plurality of the plate fins are arranged at intervals, and the long A refrigerator comprising a cooler having the refrigerant tube penetrated through a hole and an air passage in which the cooler is disposed, wherein the bypass air passage bypasses a portion of the air passage on the cross-sectional side of the cooler. A refrigerator characterized in that the bypass air passage on the inclined reverse side is made longer than the bypass air passage on the inclined direction side of the long hole with respect to the air direction passing through the cooler. Refrigerant tubes 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 straight pipe portions and curved pipe portions are continuously formed, and plate fins provided with a plurality of long holes on the plate surface And a color molding part cut and raised substantially perpendicularly to the plate fin surface in the longitudinal direction of the rectangular part of the long hole, and a plurality of the plate fins are arranged at intervals, and the long A refrigerator comprising a cooler having the refrigerant tube penetrated through a hole and an air passage in which the cooler is disposed, wherein the bypass air passage bypasses a portion of the air passage on the cross-sectional side of the cooler. The refrigerator is characterized in that the bypass air passage on the inclined direction side of the elongated hole is eliminated with respect to the air direction passing through the cooler, and the bypass air passage is provided only on the opposite side of the inclined direction. The refrigerator according to claim 2, wherein the opening width on the windward side of the bypass air passage is widened so that the opening width gradually decreases toward the leeward side.