JP2012220137A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing a decrease in heat exchanging performance due to clogging of radiation fins of the heat exchanger, which is caused since dust enters between the radiation fins of the heat exchanger and is deposited on the radiation fins.SOLUTION: Radiation fins 222 are corrugated and arranged horizontally between refrigerant passage tubes 221 which are formed in a flat shape having a plurality of refrigerant passages disposed in parallel, and extended in a zigzag form, so that dust 225 of the radiation fins is deposited on fin troughs 227 of the corrugated radiation fins 222, but not deposited on fin crests 226 of the radiation fins 222. Consequently, even when the dust is deposited on the fin troughs 227 of the radiation fins 222, the fin crests 226 of the radiation fins 222 are free from occurrence of clogging of the dust 225, and heat exchange area of the radiation fins 222 can be secured to secure the heat exchanging performance.

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger that constitutes a refrigeration cycle, a heat pump cycle, and the like.

  Conventionally, for example, in vending machines that sell products such as canned beverages and beverages in plastic bottles, a refrigeration cycle is installed in the interior (indoors) of the product cabinet of the main body cabinet, which is the main body of the vending machine, and in the machine room (outdoors). A heat exchanger that is a component device such as a heat pump cycle is provided.

  In this type of heat exchanger, a flat refrigerant passage pipe in which a plurality of refrigerant flow paths are juxtaposed is extended in a meandering manner, and an inlet-side header is provided on the inlet side of the refrigerant passage pipe. An outlet header is connected to the outlet side. A corrugated fin is joined and disposed between the vertically extending portions of the refrigerant passage tube. More specifically, the corrugated fin has a louver raised, and the bent portion outside is joined between the vertically extending portions of the refrigerant passage pipe. (For example, refer to Patent Document 1).

JP-A-5-322478

  When using the heat exchanger as proposed in Patent Document 1 described above as an outdoor heat exchanger of a vending machine, it is necessary to pay attention to clogging due to dust between the fins. In other words, the heat exchanger must solve the decrease in heat exchange amount due to fin clogging.

  In view of the above circumstances, an object of the present invention is to provide a heat exchanger that can secure a heat exchange amount against clogging due to dust, dust, etc. even when used as a heat exchanger of a vending machine. To do.

In order to achieve the above object, a heat exchanger according to claim 1 of the present invention comprises a refrigerant passage pipe having a flat shape in which a plurality of refrigerant passages are arranged side by side and extending in a meandering manner, A refrigerant passing through the refrigerant passage tube that is thermally connected between the upstream parallel extension portion and the downstream parallel extension portion while extending in parallel with each other in the refrigerant passage tube; And a plurality of fin members that promote heat exchange with the fluid passing through the periphery of the heat exchanger. It is characterized by being installed horizontally.
A heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect described above, wherein, in the fin member, the fin crest and the fin trough formed by being bent into a corrugated shape have substantially the same shape. It is characterized by that.

  According to the present invention, since the wave-shaped radiating fin has a flat shape in which a plurality of refrigerant passages are arranged side by side and is horizontally disposed between the refrigerant passage tubes extending in a meandering manner, The dust adhering to is deposited on the upper surface side of the corrugated fin valley, but is not deposited on the lower surface side of the fin crest. As a result, even if dust accumulates on the upper surface side of the fin valley portion of the radiating fin, dust clogging does not occur on the lower surface side of the fin ridge portion of the radiating fin, so that a fin heat exchange area can be secured and heat exchange performance Can be secured. Further, the heat dissipating fin of the present invention is horizontally installed between the parallel extending portions of the refrigerant passage tube, so that the accumulated dust can be removed with a brush or a brush or easily removed with an electric vacuum cleaner. Therefore, it is possible to recover the heat exchange performance degradation due to dust accumulation. Thereby, it is possible to suppress a decrease in the wind speed and a decrease in the air volume of the heat exchanger air passage, and it is possible to prevent the cooling efficiency from being decreased.

FIG. 1 is a perspective view of a vending machine to which a heat exchanger according to an embodiment of the present invention is applied. FIG. 2 is a sectional view of the internal structure of the vending machine shown in FIG. 1 as viewed from the front. FIG. 3 is a cross-sectional side view showing the internal structure of the vending machine shown in FIG. FIG. 4 is a front view schematically showing the outdoor heat exchanger shown in FIG. FIG. 5 is an enlarged view schematically showing the radiation fins of the outdoor heat exchanger shown in FIG.

Hereinafter, preferred embodiments of a heat exchanger according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a vending machine to which a heat exchanger according to an embodiment of the invention is applied.

  FIG. 2 is a cross-sectional view showing the case where the internal structure of the vending machine to which the heat exchanger according to the embodiment of the present invention is applied is viewed from the front. The vending machine illustrated here includes a main body cabinet 1.

The main body cabinet 1 is in the form of a rectangular parallelepiped whose front is open. The main body cabinet 1 is provided with three independent commodity containers 3 partitioned by, for example, two heat insulating partition plates 2 in a side-by-side manner. This product storage 3 is for storing products such as canned beverages and beverages containing plastic bottles while maintaining a desired temperature, and has a heat insulating structure.
FIG. 3 is a cross-sectional side view showing the internal structure of the vending machine shown in FIG. As shown in FIG. 3, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1. The inner door 5 is for opening and closing the front surface of the product storage 3 and is disposed on the front surface of the product storage 3 to open and close when replenishing products.

  The product storage 3 is provided with a product storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The commodity storage rack 6 is for storing commodities in a manner arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the product storage rack 6 and is used to carry out the products at the bottom of the product group stored in the product storage rack 6 one by one. The carry-out shooter 8 is for guiding the product carried out from the carry-out mechanism 7 to the product take-out port 4 a provided in the outer door 4.

  An indoor heat exchanger 24 and a heater H are disposed below the carry-out shooter 8. The indoor heat exchanger 24 is disposed on the front side of the rear duct D. The indoor heat exchanger 24 is a compressor 21 disposed in the machine room 9, and the outdoor heat exchanger 22 is a heat exchanger according to the present embodiment, and is sequentially connected through an expansion mechanism 23 and a refrigerant pipe 25. Thus, a refrigerant circuit (refrigeration cycle) 20 is formed.

  The compressor 21 sucks the refrigerant through the suction port, compresses the sucked refrigerant to be in a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant), and discharges it from the discharge port. The outdoor heat exchanger 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with the ambient air taken in by the condensing fan 12. The expansion mechanism 23 is for adiabatic expansion by reducing the pressure of the refrigerant passing therethrough.

  By circulating the refrigerant in the refrigerant circuit 20, the refrigerant compressed by the compressor 21 is condensed by the outdoor heat exchanger 22, and then adiabatically expanded by the expansion mechanism 23 and passes through the indoor heat exchanger 24. When the refrigerant passes through the indoor heat exchanger 24, heat is exchanged with the internal air (indoor air) of the product storage 3 in which the indoor heat exchanger 24 is disposed, and the refrigerant evaporates. To cool the internal air. The evaporated refrigerant is sucked into the compressor 21.

  The cooled internal air moves through the interior of the product storage 3 by driving the indoor blower fan F1, whereby the product stored in the product storage rack 6 of the product storage 3 is brought to a desired temperature (for example, 5 ° C.). It will be cooled.

  The heater H is disposed in the front area of the indoor fan F1. The heater H heats the surrounding air when energized. The air heated by the heater H moves inside the product storage 3 by driving the indoor blower fan F1, so that the product stored in the product storage rack 6 of the product storage 3 has a desired temperature (for example, 55). ° C).

  4 and 5 schematically show the outdoor heat exchanger 22 shown in FIG. 3, respectively, FIG. 4 is a front view, and FIG. 5 is an enlarged view of the radiating fins 222 according to the present invention. . The outdoor heat exchanger 22 exemplified here includes a refrigerant passage pipe 221, a heat radiation fin 222, an inlet pipe 223, and an outlet pipe 224.

  The refrigerant passage tube 221 is formed to meander from side to side. And it is perpendicular to the direction of air flow. The inlet pipe 223 is connected to the inlet side end of the refrigerant passage pipe 221, and the outlet pipe 224 is connected to the outlet side end of the refrigerant passage pipe 221. The heat radiating fins 222 are bent and formed in a wave shape, and are joined by brazing up and down so as to be sandwiched between the refrigerant passage tubes 221. As a result, the latent heat passing through the refrigerant passage tube 221 is radiated to the outside by the radiation fins 222.

  In the outdoor heat exchanger 22 according to the present embodiment, as shown in FIG. 5, dust 225 accumulates on the upper surface side of the fin valley portion 227 of the radiating fins 222 due to the ventilation by the condensing fan 12. The amount of heat exchange from the upper surface side of the radiating fin 222 is reduced. However, there is no adhesion or accumulation of dust 225 on the lower surface side of the fin crest portion 226 of the radiating fin 222, and the amount of heat exchange from the lower surface side of the radiating fin 222 does not decrease. In conventional louver cut-and-raised fins, fin-and-tubes, and the like, dust accumulates throughout the louver part and between the radiating fins juxtaposed in the vertical direction, so the amount of heat exchange from the entire surface of the radiating fins decreases. Moreover, it is difficult to remove dust that has entered the back side of the gap between the heat dissipating fins, and it is virtually impossible to restore the amount of heat exchange once reduced.

  Thus, in the present invention, the wave-shaped radiating fins 222 have a flat shape in which a plurality of refrigerant passages are arranged side by side, and are horizontally disposed between the refrigerant passage tubes 221 extending in a meandering manner. Therefore, the dust 225 accumulates on the upper surface side of the fin valley portion 227 of the corrugated fin, but does not accumulate on the lower surface side of the fin crest portion 226. Thereby, since dust 225 does not accumulate on the whole radiation fin 222, a fin heat exchange area can be secured and heat exchange performance can be secured.

  In addition, dust that has accumulated and clogged deeply between the fins of a conventional cut-and-raised fin or fin-and-tube heat exchanger cannot be easily removed using a brush or an electric vacuum cleaner. Because of the corrugated horizontal arrangement, the accumulated dust can be removed with a brush or brush or easily with an electric vacuum cleaner, making it easy to recover the heat exchange performance degradation due to dust accumulation . Therefore, it is possible to suppress a decrease in the wind speed and a decrease in the air volume of the heat exchanger, and it is possible to prevent a decrease in cooling efficiency.

  As described above, the heat exchanger having the wave-shaped radiating fins according to the present invention prevents the heat exchange performance from being deteriorated by dust and has a refrigeration cycle used for cooling products in vending machines and the like. It is useful for the refrigerant circuit which comprises.

DESCRIPTION OF SYMBOLS 1 Main body cabinet 20 Refrigerant circuit 21 Compressor 22 Outdoor heat exchanger 221 Refrigerant passage pipe 222 Radiation fin 223 Inlet pipe 224 Outlet pipe 225 Dust 226 Fin peak part 227 Fin trough part 23 Expansion mechanism 24 Indoor heat exchanger 25 Refrigerant piping

Claims (2)

A refrigerant passage pipe having a flat shape in which a plurality of refrigerant passages are arranged side by side and extending in a meandering manner;
A refrigerant that is thermally connected between the upstream parallel extending portion and the downstream parallel extending portion while extending in parallel with each other in the refrigerant passage tube, and passes through the refrigerant passage tube; A heat exchanger comprising a plurality of fin members that facilitate heat exchange with a fluid passing through the surroundings of the heat exchanger,
2. The heat exchanger according to claim 1, wherein the fin member is formed by being bent into a corrugated shape, and is horizontally installed between the parallel extending portions of the refrigerant passage tube.   2. The heat exchanger according to claim 1, wherein in the fin member, a fin crest and a fin trough formed by being bent in a corrugated shape have substantially the same shape.