JP2013019556A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit device allowing a radiator to be miniaturized while assuring its favorable heat exchange performance.SOLUTION: The refrigerant circuit device including 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 dissipating 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 circulating the refrigerant in the refrigerant circuit 30 includes: a blower fan 40 for blowing in a mode such that air introduced through an air introduction port 14 is passed through the first radiator 32 and is then passed through the second radiator 33; and guide members 41, 42 for introducing part of air introduced through the air introduction port 14 and guiding air introduced toward the second radiator 33 without passing through the first radiator 32.

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. For this reason, in the second radiator, a sufficient temperature difference between the passing refrigerant and the passing air cannot be ensured. Therefore, in order to satisfy the heat exchange amount, it is necessary to expand the heat exchange area.

  However, in the above showcase, since the bypass path is provided in consideration of the case where the second radiator is clogged, in order to secure the bypass path, the heat exchange area of the second radiator is expanded. As a result, the heat exchange performance is degraded.

  In view of the above circumstances, an object of the present invention is to provide a refrigerant circuit device capable of reducing the size of a radiator while improving heat exchange performance.

  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 radiates the refrigerant compressed by the compressor, a second radiator that radiates the refrigerant radiated by the first radiator, and an expansion mechanism that adiabatically expands the refrigerant radiated by the second radiator In a refrigerant circuit device in which the refrigerant circuit is configured to circulate the refrigerant in the refrigerant circuit, the air introduced through the air inlet is passed through the first radiator. Blowing means for blowing air in a mode of passing through the second radiator, a part of the air introduced through the air introduction port, and taking in the second radiator without passing through the first radiator Guy who guides the air Characterized by comprising a member.

  The refrigerant circuit device according to claim 2 of the present invention is the refrigerant circuit device according to claim 1 described above, wherein the guide member guides air taken toward at least one of the upper side and the lower side of the second radiator. It is characterized by that.

  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 air blowing means blows the air introduced through the air introduction port in such a manner that the air is passed through the first heat radiator and then the second heat radiator, so the temperature difference between the passing refrigerant and the passing air. Can be made sufficiently large, and the amount of heat exchange in the first radiator can be increased. Thereby, if the amount of heat exchange in the first radiator is equivalent to that of the conventional one, the first radiator can be reduced in size. Moreover, since the guide member takes in part of the air introduced through the air inlet and guides the air taken in toward the second radiator without passing through the first radiator, it passes through the second radiator. The air to be passed is substantially equal to the outside air temperature, and even if the refrigerant passing through the second radiator dissipates heat with the first radiator, the temperature difference between the passing refrigerant and the passing air may be sufficiently large. it can. Thereby, if the amount of heat exchange in the second radiator is equivalent to that of the conventional one, the second radiator can be reduced in size. Therefore, it is possible to increase the heat exchange amount by increasing the temperature difference between the passing refrigerant and the passing air in each of the first radiator and the second radiator. Therefore, if the heat exchange amount is equivalent to the conventional one, it is possible to reduce the size of the first radiator and the second radiator, thereby improving the heat exchange performance and improving the heat exchanger performance. 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.

  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 is disposed on the rear side of the first radiator 32. . The second radiator 33 radiates the refrigerant radiated by the first radiator 32.

  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. More specifically, the blower fan 40 blows air introduced through the air introduction port 14 in such a manner that it passes through the first radiator 32 and then passes through the second radiator 33. 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, guide members 41 and 42 are disposed on the upper side and the lower side of the first radiator 32. The guide member 41 on the upper side of the first radiator 32 takes in part of the air introduced through the air introduction port 14 and faces the upper side of the second radiator 33 without passing through the first radiator 32. It guides the air taken in. Further, the guide member 42 on the lower side of the first radiator 32 takes in part of the air introduced through the air inlet 14 and faces the lower side of the second radiator 33 without passing through the first radiator 32. It guides the air taken in.

  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 device constituting the showcase, the blower fan 40 blows air introduced through the air introduction port 14 in such a manner that it passes through the first radiator 32 and then passes through the second radiator 33. Moreover, the refrigerant compressed by the compressor 31 passes through the first radiator 32. Therefore, the temperature difference between the passing refrigerant and the passing air can be made sufficiently large, and the amount of heat exchange in the first radiator 32 can be increased. Thereby, if the heat exchange amount in the 1st heat radiator 32 is made into the same thing as a conventional thing, the 1st heat radiator 32 can be reduced in size and the space which installs the guide members 41 and 42 is enough. Can be secured.

  Then, as shown in FIG. 2, each guide member 41, 42 takes in part of the air introduced through the air introduction port 14, and does not pass through the first radiator 32, so that the upper part of the second radiator 33. Since the air taken in toward the side and the lower side is guided, the air passing through the second radiator 33 becomes substantially equal to the outside air temperature, and the refrigerant passing through the second radiator 33 dissipates heat in the first radiator 32. Even if this is done, the temperature difference between the passing refrigerant and the passing air can be made sufficiently large. Thereby, if the heat exchange amount in the 2nd heat radiator 33 is made into the same thing as a conventional one, the 2nd heat radiator 33 can be reduced in size.

  According to the refrigerant circuit device according to the present embodiment, by increasing the logarithmic average temperature difference (ΔTm) between the passing refrigerant and the passing air in each of the first radiator 32 and the second radiator 33 in this way, It becomes possible to increase the heat exchange amount (Q). Therefore, if the heat exchange amount is equivalent to the conventional one, the first radiator 32 and the second radiator 33 can be reduced in size, thereby radiating heat while improving the heat exchange performance. The size of the vessel can be reduced.

  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 guide members 41 and 42 are disposed on the upper side and the lower side of the first radiator 32. However, in the present invention, the guide member is air introduced through the air inlet 14. If the air taken in toward the second radiator 33 can be guided without passing through the first radiator 32 without passing through the first radiator 32, the installation location is not particularly limited.

  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 41 Guide member 42 Guide member 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 for radiating the refrigerant radiated by the radiator and an expansion mechanism for adiabatic expansion of the refrigerant radiated by the second radiator with a refrigerant pipe; In the refrigerant circuit device designed to circulate,
Blower means for blowing air introduced through the air inlet in a mode of passing the second radiator after passing through the first radiator;
A guide member that takes in part of the air introduced through the air inlet and guides the air taken in toward the second radiator without passing through the first radiator. Refrigerant circuit device.   The refrigerant circuit device according to claim 1, wherein the guide member guides air taken toward at least one of an upper side and a lower side of the second radiator.   The refrigerant circuit device according to claim 1, wherein the refrigerant is carbon dioxide.

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