JP2013019565A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit device allowing a radiator to be miniaturized.SOLUTION: The refrigerant circuit device includes a refrigerant circuit 30 composed by connecting an evaporator 35, a compressor 31 for sucking and compressing a refrigerant evaporated in the evaporator 35, a first radiator 32 for dissipating heat of the refrigerant compressed by the compressor 31, a second radiator 33 for cooling heat of the refrigerant having dissipated heat in the first radiator 32, and an expansion mechanism 34 for adiabatically expanding the refrigerant having dissipated heat in the second radiator 33 by refrigerant piping 36, and a blower fan 40 for blowing air introduced through an air introduction port 14 to the first radiator 32 and the second radiator 33, wherein the first radiator 32 and the second radiator 33 are disposed in attitudes lying sideways in parallel mutually in a mode where a distance between them is gradually separated in a blowing direction of air by the blower fan 40, or in a mode where they are gradually approached.

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device applied to a showcase in which a commodity to be stored is held at a desired temperature state.

  Conventionally, the following is known as a showcase in which a commodity to be stored is held at a desired temperature state. A plurality of product placement shelves are provided in a vertical direction in a storage chamber inside the case main body with an opening formed on the front surface, and products are placed on the product placement shelves. Further, a passage for the air in the storage chamber sucked through the suction port is formed inside the case body and outside the storage chamber, and an evaporator is disposed in the air passage.

  The evaporator is connected to the compressor, the first radiator, the second radiator, and the expansion mechanism, which are disposed in the machine body inside the case body and separate from the storage chamber and the air passage, by refrigerant piping. Constitutes the refrigerant circuit. The evaporator evaporates the supplied refrigerant. The compressor sucks and compresses the refrigerant evaporated in the evaporator. The first radiator radiates heat from the refrigerant compressed by the compressor. The second radiator radiates the refrigerant radiated by the first radiator. The expansion mechanism adiabatically expands the refrigerant radiated by the second radiator.

  As a result of the circulation of the refrigerant in such a refrigerant circuit, the air passing through the air passage is cooled by the evaporator and then blown out from the outlet provided in the upper part of the storage chamber. Air blown from the air outlet is sucked into the suction port and circulated, so that a cold air curtain is formed near the front opening of the storage room, and the product placed on the product placement shelf is adjusted to a desired temperature. Being held.

  Further, the showcase includes a blowing unit that introduces outside air from an air introduction port provided in the machine room, and blows air so that the introduced air passes through the first radiator after passing through the second radiator. Are known (for example, see Patent Document 1).

JP 2008-51369 A

  By the way, the heat exchange amount (Q) in the radiator is a function of the logarithm average temperature difference (ΔTm) between the passing refrigerant and the passing air, the heat exchange area (A), and the air flow rate of the passing air (K). (Q = K · A · ΔTm). In the above-described showcase, the air blowing means blows air introduced from the air inlet through the second radiator and then passes through the first radiator, and the refrigerant passing through the second radiator is: The heat is dissipated by the first radiator. Therefore, in the second radiator, a sufficient temperature difference between the passing refrigerant and the passing air cannot be secured. Therefore, in order to satisfy the heat exchange amount, it is necessary to enlarge the heat exchange area. As a result, the size of the radiator is increased.

  An object of this invention is to provide the refrigerant circuit apparatus which can achieve size reduction of a heat radiator in view of the said situation.

  In order to achieve the above object, a refrigerant circuit device according to claim 1 of the present invention evaporates supplied refrigerant to cool ambient air, and sucks and compresses refrigerant evaporated in the evaporator. A compressor, a first radiator that dissipates the refrigerant compressed by the compressor, a second radiator that dissipates the refrigerant dissipated by the first radiator, and an expansion mechanism that adiabatically expands the refrigerant dissipated by the second radiator A refrigerant circuit comprising: a refrigerant circuit connected to each other by a refrigerant pipe; and a blowing means for blowing air introduced through an air inlet to the first radiator and the second radiator. The second radiator and the second radiator are arranged in a sideways posture in parallel with each other in a mode in which the intervals are gradually separated from each other along the air blowing direction by the blowing means, or in a mode of gradually approaching. And

  The refrigerant circuit device according to a second aspect of the present invention is the refrigerant circuit device according to the first aspect, wherein the second radiator is disposed on an upper side with respect to the first radiator. .

  The refrigerant circuit device according to claim 3 of the present invention is characterized in that in claim 1 or claim 2, the refrigerant is carbon dioxide.

  According to the present invention, the first radiator and the second radiator are arranged in a sideways posture in parallel with each other in a mode in which the intervals are gradually separated from each other along the air blowing direction by the blowing unit or in a mode of gradually approaching. Therefore, the air (outside air) introduced through the air inlet can be separated into one that passes through the first radiator and one that passes through the second radiator. By separating in this way, the air volume of the air passing through the second radiator is reduced as compared with the conventional one, but the air passing through the second radiator is substantially equal to the outside air temperature, (2) Even if the refrigerant passing through the radiator is radiated by the first radiator, the temperature difference between the passing refrigerant and the passing air can be made sufficiently large, and the first radiator and the second radiator. Since both are arranged in a sideways posture, the heat exchange area can be increased by increasing the air passage distance in each radiator. Therefore, it is possible to increase the amount of heat exchange in the radiator, and if the amount of heat exchange is the same as the conventional one, the second radiator can be reduced in size. There exists an effect that size reduction can be achieved.

FIG. 1 is a cross-sectional side view schematically showing a case where an internal structure of a showcase to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the side. FIG. 2 is an explanatory view schematically showing the flow of air in the first radiator and the second radiator in the machine room shown in FIG. FIG. 3 is an explanatory view showing a modification of the refrigerant circuit device according to the embodiment of the present invention.

  Exemplary embodiments of a refrigerant circuit device according to the present invention will be explained below in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional side view schematically showing a case where an internal structure of a showcase to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the side. The showcase illustrated here includes a case body 10.

  The case main body 10 is a substantially rectangular heat insulating casing having an opening 10a formed on the front surface. A storage chamber 11 is defined inside the case main body 10 and an air circulation means 20 is provided therein.

  The storage chamber 11 is a chamber defined so as to face the front opening 10a, and a plurality of (four in the illustrated example) product placement shelves 12 are arranged in a plurality of stages along the vertical direction. . The merchandise placement shelf 12 is for placing merchandise.

  The air circulation means 20 includes an air passage 21 and a circulation fan 22. The air passage 21 is an air passage from the suction port 211 to the air outlet 212. Here, the suction port 211 is an opening for sucking air inside the storage chamber 11, and extends along the left-right direction of the storage chamber 11. The suction port 211 is disposed at the lower front edge of the storage chamber 11, that is, at the lower portion near the front opening 10 a of the case body 10. The air outlet 212 is an opening for blowing air into the storage chamber 11. The air outlet 212 extends in the left-right direction of the storage chamber 11, and is disposed on the upper front edge of the storage chamber 11, that is, in the upper portion of the case body 10 near the front opening 10 a.

  Such an air passage 21 includes a lower duct 21a that is outside the storage chamber 11 and below it, a back duct 21b that is outside the storage chamber 11 and on the back side, and is outside the storage chamber 11 and above it. The upper duct 21c is connected to the upper duct 21c.

  The circulation fan 22 circulates air and is disposed at a predetermined portion of the lower duct 21a. In the present embodiment, the circulation fan 22 is disposed at a predetermined portion of the lower duct 21a. However, in the present invention, the position of the circulation fan 22 is not particularly limited, and the circulation fan 22 described later. It may be arranged anywhere as long as the function can be exhibited.

  In such an air circulation means 20, the circulation fan 22 is driven to suck in air (internal air) inside the storage chamber 11 through the suction port 211, and the sucked air is blown in a manner that passes through the air passage 21. By sending the air to the outlet 212 and blowing the air sent through the outlet 212 into the interior of the storage chamber 11, the air is circulated between the inside and the outside of the storage chamber 11, and in the vicinity of the front opening 10 a of the storage chamber 11. The air curtain AC is formed.

  An evaporator 35 is provided in the rear duct 21 b constituting the air passage 21. The evaporator 35 is connected to the compressor 31, the first radiator 32, the second radiator 33, and the expansion mechanism 34 by the refrigerant pipe 36 to constitute a refrigerant circuit 30 that circulates a refrigerant such as carbon dioxide. Yes. The refrigerant circuit 30 constitutes a refrigerant circuit device together with the blower fan 40.

  The compressor 31 is disposed inside the case body 10 and in a machine chamber 13 separate from the storage chamber 11 and the air passage 21. The compressor 31 compresses the refrigerant.

  The first radiator 32 is a fin tube type heat exchanger disposed in the machine room 13 similarly to the compressor 31, and radiates the refrigerant compressed by the compressor 31. The second radiator 33 is a fin tube type heat exchanger disposed in the machine chamber 13 similarly to the compressor 31 and the first radiator 32, and dissipates the refrigerant radiated by the first radiator 32. is there.

  The expansion mechanism 34 is disposed in the machine chamber 13 in the same manner as the compressor 31, the first radiator 32, and the second radiator 33, and is configured by, for example, a capillary tube or an expansion valve. The expansion mechanism 34 adiabatically expands the refrigerant passing therethrough to bring it into a low temperature and low pressure state.

  The evaporator 35 cools the ambient air, that is, the air passing through the back duct 21b by evaporating the refrigerant adiabatically expanded by the expansion mechanism 34. The refrigerant evaporated in the evaporator 35 is sucked into the compressor 31. The refrigerant circuit 30 is provided with an internal heat exchanger 37. The internal heat exchanger 37 includes a third heat radiator 371 and a heat absorber 372. The third radiator 371 is provided between the second radiator 33 and the expansion mechanism 34 and allows the refrigerant that has passed through the second radiator 33 to pass therethrough. The heat absorber 372 is provided between the evaporator 35 and the compressor 31 and allows the refrigerant that has passed through the evaporator 35 to pass therethrough. Such an internal heat exchanger 37 is configured such that the refrigerant passing through the third radiator 371 and the refrigerant passing through the heat absorber 372 can exchange heat with each other, and thus have passed through the second radiator 33. Heat exchange is performed between the refrigerant and the refrigerant that has passed through the evaporator 35.

  The blower fan 40 is disposed in the machine room 13 and is driven by the air blower 40 through the air inlet 14 provided on the front surface of the machine room 13 to the first radiator 32 and the second radiator 33. It is the ventilation means which blows. Here, reference numeral 15 in FIG. 1 denotes a filter disposed in a manner covering the air inlet 14.

  In such a refrigerant circuit device, the first radiator 32 and the second radiator 33 are arranged in parallel with each other in such a manner that their intervals gradually approach along the air blowing direction (front-rear direction) by the blower fan 40. The second radiator 33 is disposed on the upper side with respect to the first radiator 32 while being disposed in an inverted posture.

  In the showcase configured as described above, the product placed on each product placement shelf 12 can be maintained at a desired temperature by driving the circulation fan 22 and the compressor 31. That is, by driving the circulation fan 22, the air inside the storage chamber 11 is sucked through the suction port 211 and reaches the rear duct 21 b after passing through the lower duct 21 a. It is cooled by the evaporator 35 in the middle of the rear duct 21b, becomes cold air, passes through the rear duct 21b and the upper duct 21c, and is blown out from the outlet 212. The air (cold air) blown out from the air outlet 212 flows toward the suction port 211 to form an air curtain AC, and is placed on the product inside the storage chamber 11, that is, the product placement shelf 12. The product will be cooled.

  By the way, in the refrigerant circuit apparatus which comprises the said showcase, the 1st heat radiator 32 and the 2nd heat radiator 33 are the aspects which a mutual space | interval gradually approaches along the ventilation direction (front-back direction) of the air by the ventilation fan 40. Since they are arranged in a sideways posture in parallel with each other, the air (outside air) introduced through the air inlet 14 by driving the blower fan 40 passes through the filter 15 as shown in FIG. The thing which passes the heat radiator 32 and the thing which passes the 2nd heat radiator 33 are isolate | separated. Then, the air that has passed through the first radiator 32 and the air that has passed through the second radiator 33 are blown toward the rear.

  Thus, the air introduced through the air inlet 14 is separated into the air that passes through the first radiator 32 and the one that passes through the second radiator 33, so that the air that passes through the second radiator 33. The amount of air will be reduced compared to the previous one. However, even if the air passing through the second radiator 33 is substantially equal to the outside air temperature, and the refrigerant passing through the second radiator 33 is radiated by the first radiator 32, the passing refrigerant and the passing air The temperature difference can be made sufficiently large. In addition, since both the first radiator 32 and the second radiator 33 are disposed in the sideways posture, the heat exchange area can be increased by increasing the air passage distance in each radiator.

  According to the refrigerant circuit device of the present embodiment, the logarithm average temperature difference (ΔTm) and the heat exchange area (A) between the passing refrigerant and the passing air are increased even if the air volume of the passing air is reduced in this way. Thus, the heat exchange amount (Q) can be increased. Therefore, if the heat exchange amount is equivalent to that of the conventional one, the second radiator 33 can be reduced in size, thereby reducing the size of the radiators (the first radiator 32 and the second radiator 33). Can be achieved.

  Further, according to the refrigerant circuit device, a sufficient amount of heat exchange can be ensured in the radiators (the first radiator 32 and the second radiator 33). An increase in high pressure due to a temperature rise can be avoided, and reliability can be improved.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the above-described embodiment, the first heat radiator 32 and the second heat radiator 33 lie sideways in parallel with each other in such a manner that the intervals gradually approach along the air blowing direction (front-rear direction) by the blower fan 40. However, in the present invention, as shown in FIG. 3, the first radiator 321 and the second radiator 331 are arranged along the air blowing direction (front-rear direction) by the blower fan 40. They may be arranged in a sideways posture in parallel with each other in such a manner that the gaps are gradually separated.

  Even in such a configuration, the air (outside air) introduced through the air inlet 14 by driving the blower fan 40 passes through the filter 15 and then passes through the first radiator 321 and the second heat dissipation. It can be separated from what passes through the vessel 331. As a result, the air volume of the air passing through the second radiator 331 is reduced as compared with the conventional one, but the air passing through the second radiator 331 is substantially equal to the outside air temperature, and the second radiator 331. Even if the refrigerant passing through the first heat radiator 321 radiates heat, the temperature difference between the passing refrigerant and the passing air can be made sufficiently large. In addition, since both the first radiator 321 and the second radiator 331 are disposed in the sideways posture, the heat exchange area can be increased by increasing the air passage distance in each radiator. Therefore, it is possible to increase the heat exchange amount (Q) by increasing the logarithm average temperature difference (ΔTm) and the heat exchange area (A) between the passing refrigerant and the passing air. It is possible to reduce the size of the second radiator 331, and thus the size of the radiator (the first radiator 321 and the second radiator 331) can be reduced.

  As described above, the refrigerant circuit device according to the present invention is useful for a showcase that holds a product to be stored in a desired temperature state.

DESCRIPTION OF SYMBOLS 10 Case main body 10a Front opening 11 Storage room 12 Commodity mounting shelf 13 Machine room 14 Air inlet 15 Filter 20 Air circulation means 21 Air passage 21a Lower duct 21b Rear duct 21c Upper duct 211 Inlet 212 Outlet 22 Circulation fan 30 Refrigerant Circuit 31 Compressor 32 First radiator 33 Second radiator 34 Expansion mechanism 35 Evaporator 36 Refrigerant piping 37 Internal heat exchanger 40 Blower fan AC Air curtain

Claims (3)

An evaporator that evaporates the supplied refrigerant and cools the ambient air; a compressor that sucks and compresses the refrigerant evaporated by the evaporator; a first radiator that dissipates the refrigerant compressed by the compressor; A refrigerant circuit formed by connecting a second radiator that radiates the refrigerant radiated by the radiator and an expansion mechanism that adiabatically expands the refrigerant radiated by the second radiator by a refrigerant pipe;
A refrigerant circuit device comprising: air blowing means for blowing air introduced through an air inlet to the first radiator and the second radiator;
The first radiator and the second radiator are arranged in a sideways posture in parallel with each other in a mode in which the distance between the first radiator and the second radiator is gradually separated along the air blowing direction by the blowing means or in a gradually approaching manner. There is a refrigerant circuit device.   The refrigerant circuit device according to claim 1, wherein the second heat radiator is disposed on an upper side with respect to the first heat radiator.   The refrigerant circuit device according to claim 1, wherein the refrigerant is carbon dioxide.

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