JP3635902B2 - Showcase refrigeration equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a refrigeration apparatus for showcases, and more particularly to a refrigeration apparatus for showcases that prevents cooling at the feet in front of the showcase.
[Prior art]
[0003]
As shown in FIG. 2 , the general showcase is configured to cool the commodity placed on the display shelf A with the cold air W blown from the upper side of the display shelf A.
[Problems to be solved by the invention]
[0004]
However, in the case of the showcase having the above configuration, since the front of the display shelf A is in an open state, most of the cold air W blown from above leaks and stays in front of the display shelf A. A cold air region C is formed at the feet in front of the case. The cold air region C is not a problem in the summer, but in the seasons other than the summer, particularly in the intermediate period (for example, spring or autumn), it gives an unpleasant feeling that the feet of the person passing the front of the showcase are cooled. There was a problem.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to make it possible to eliminate the cooling of the feet in front of the showcase with simple means.
[Means for Solving the Problems]
[0006]
In the first aspect of the invention, as means for solving the above problems, the primary refrigerant compressor 5 that compresses the primary refrigerant x, the primary refrigerant condenser 6 that condenses and liquefies the primary refrigerant x, and the primary refrigerant x are decompressed. A primary refrigerant decompression mechanism 7 and a primary refrigerant evaporator 8 for evaporating the primary refrigerant x are sequentially connected via a refrigerant pipe 13 and a secondary refrigerant y for compressing the secondary refrigerant y. Compressor 9, secondary refrigerant condenser 10 that condenses and liquefies secondary refrigerant y by heat exchange with primary refrigerant evaporator 8, secondary refrigerant decompression mechanism 11 that depressurizes secondary refrigerant y, and secondary refrigerant and a low-temperature side refrigeration cycle B in which secondary refrigerant evaporators 12 for evaporating y are sequentially connected via a refrigerant pipe 14, and showcase with cold air W cooled by the secondary refrigerant evaporator 12. Showcase refrigeration with 4 cooling The double-tube heat exchanger 3 with fins is composed of an inner pipe 24 constituting the primary refrigerant evaporator 8 and an outer pipe 25 constituting the secondary refrigerant condenser 10 in the showcase 4. And a cooling fan 26 for cooling the finned double tube heat exchanger 3, and the hot air W ′ heated by the finned double tube heat exchanger 3 is converted into the showcase 4. It is configured to blow out in front of the bottom.
[0007]
With the above-described configuration, the high-temperature gas refrigerant y discharged from the secondary refrigerant compressor 9 constitutes the outer pipe 25 of the finned double-tube heat exchanger 3 during the operation of the refrigeration apparatus. When the secondary refrigerant condenser 10 is condensed and liquefied, the air passing through the finned double-pipe heat exchanger 3 is heated to become hot air W ′, and the hot air W ′ becomes the bottom of the showcase 4. Blows forward. Therefore, the cold air region C formed in front of the bottom of the showcase 4 is warmed by the hot air W ′. In this case, the gas refrigerant y supplied to the finned double pipe heat exchanger 3 is cooled by the air passing from the inner pipe 24 side constituting the primary refrigerant evaporator 8 and through the surface of the outer pipe 25. Therefore, the cooling capacity of the high temperature side refrigeration cycle A can be reduced.
DETAILED DESCRIPTION OF THE INVENTION
[0008]
Hereinafter, with reference to the accompanying drawings, it will be described in detail good optimal embodiment of the present invention.
[0009]
As shown in FIG. 1, the showcase refrigeration apparatus includes a primary refrigerant compressor 5 that compresses the primary refrigerant x, a primary refrigerant condenser 6 that condenses and liquefies the primary refrigerant x, and a primary refrigerant that decompresses the primary refrigerant x. High-pressure side refrigeration cycle A in which primary pressure-reducing mechanism 7 and primary refrigerant evaporator 8 for evaporating primary refrigerant x are sequentially connected via refrigerant pipe 13, and a secondary refrigerant compressor for compressing secondary refrigerant y 9. A secondary refrigerant condenser 10 that condenses and liquefies the secondary refrigerant y by heat exchange with the primary refrigerant evaporator 8, a secondary refrigerant decompression mechanism 11 that decompresses the secondary refrigerant y, and the secondary refrigerant y. It is constituted by a dual refrigeration apparatus including a low-temperature side refrigeration cycle B in which the evaporator 12 for secondary refrigerant to be evaporated is sequentially connected via a refrigerant pipe 14. The cascade heat exchanger 3 is composed of a finned double tube heat exchanger composed of an inner pipe 24 constituting the primary refrigerant evaporator 8 and an outer pipe 25 constituting the secondary refrigerant condenser 10. .
[0010]
The primary refrigerant compressor 5 and the primary refrigerant condenser 6 are arranged in the outdoor unit 1, and the primary refrigerant decompression mechanism 7, the cascade heat exchanger 3, the secondary refrigerant compressor 9, and the secondary refrigerant decompression. The mechanism 11 and the secondary refrigerant evaporator 12 are arranged in the showcase 4.
[0011]
The showcase 4 includes a display shelf (not shown) and a cold air circulation path 19, and a machine room 20 for arranging the secondary refrigerant compressor 9 and the cascade heat exchanger 3 at the bottom thereof. Is formed. A cooling fan 16 that pumps air to the secondary refrigerant evaporator 12 and the secondary refrigerant evaporator 12 are disposed in the cold air circulation path 19.
[0012]
At the bottom of the showcase 4, the cascade heat exchanger 3 and a cooling fan 26 for cooling the cascade heat exchanger 3 are disposed. Reference numeral 27 denotes a fin formed on the outer periphery of the outer tube 25. The hot air W ′ heated when passing through the cascade heat exchanger 3 is blown forward from a hot air outlet (not shown) formed in the front surface of the machine room 20 at the bottom of the showcase 4. It is configured as follows.
[0013]
The showcase refrigeration apparatus configured as described above operates as follows.
[0014]
The primary refrigerant (high-temperature gas refrigerant) x pumped from the primary refrigerant compressor 5 is supplied to the primary refrigerant condenser 6 as shown by the solid line arrow in FIG. The pressure is reduced by the pressure reducing mechanism 7, evaporated by the primary refrigerant evaporator 8, and returned to the primary refrigerant compressor 5.
[0015]
On the other hand, y (gas refrigerant of high temperature and) secondary refrigerant pumped from the secondary refrigerant compressor 9, as shown by the solid line arrows in FIG. 1, an evaporator for said primary coolant in the secondary coolant condenser 10 8 The refrigerant is condensed and liquefied by heat exchange with the secondary refrigerant, and then depressurized by the secondary refrigerant decompression mechanism 11, and then evaporated and vaporized by the secondary refrigerant evaporator 12, and returned to the secondary refrigerant compressor 9. Therefore, the secondary refrigerant y that has been lowered in temperature by heat exchange with the primary refrigerant evaporator 8 evaporates and evaporates in the secondary refrigerant evaporator 12, thereby greatly improving the cooling effect of the secondary refrigerant evaporator 12. It will be.
[0016]
By the way, as already explained in the section of the prior art, most of the cold air W blown from the cold air outlet (not shown) of the showcase 4 leaks to the front of the showcase 4 and the front foot of the showcase 4 In this embodiment, the high-temperature gas refrigerant y discharged from the secondary refrigerant compressor 9 serves as a cascade heat exchanger, and the finned double-tube heat exchanger 3 is formed in the cold air region C. The air passing through the cascade heat exchanger 3 is heated when it is condensed and liquefied by the secondary refrigerant condenser 10 that constitutes the outer pipe 25 in FIG . It blows out at the bottom front. Accordingly, the cold air region C formed in front of the bottom of the showcase 4 is warmed by the hot air W ′, and the cooling of the feet due to the cold air region C is eliminated.
[0017]
In this case, the gas refrigerant y supplied to the cascade heat exchanger 3 is cooled by the air passing from the inner pipe 24 side constituting the primary refrigerant evaporator 8 and the air passing through the outer pipe 25 surface. The cooling capacity of the side refrigeration cycle A can be reduced.
[0018]
Incidentally, before Symbol primary refrigerant condenser 6 can be a water-cooled in air cooled. Further, the air cooling fan 26 is stopped in the summer, and is preferably operated only in an intermediate period (for example, spring or autumn).
【The invention's effect】
[0019]
According to the first aspect of the invention, the secondary refrigerant condenser 10 in which the high-temperature gas refrigerant y discharged from the secondary refrigerant compressor 9 constitutes the outer pipe 25 in the finned double pipe heat exchanger 3. Since the air passing through the finned double-tube heat exchanger 3 is heated when it is condensed and liquefied in this way, it becomes warm air W ′ and blows out in front of the bottom of the showcase 4. The cold air region C formed in front of the bottom of the air is warmed by the hot air W ', and the primary refrigerant evaporator 8 and the secondary refrigerant condenser 10 are doubled with fins to cool the feet of the cold air region C. There exists the outstanding effect that it can eliminate by the simple means of comprising with the tubular heat exchanger 3. FIG.
[0020]
In addition, in this case, the gas refrigerant y supplied to the finned double tube heat exchanger 3 is cooled by the air passing from the inner pipe 24 side constituting the primary refrigerant evaporator 8 and the surface of the outer pipe 25. As a result, the cooling capacity of the high temperature side refrigeration cycle A can be reduced.
[Brief description of the drawings]
[0021]
FIG. 1 is a refrigerant circuit diagram of a showcase refrigeration apparatus according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a general showcase.
[Explanation of symbols]
[0022]
3 is a finned double tube heat exchanger (cascade heat exchanger), 5 is a primary refrigerant compressor (compressor), 6 is a primary refrigerant condenser (condenser, air-cooled condenser), and 7 is a primary refrigerant. Decompression mechanism (decompression mechanism), 8 is an evaporator for primary refrigerant (evaporator), 9 is a compressor for secondary refrigerant, 10 is a condenser for secondary refrigerant, 11 is a decompression mechanism for secondary refrigerant, and 12 is Next refrigerant evaporator, 13, 14 refrigerant pipe, 15 air cooling heat exchanger, 16, 17 cooling fan, 20 machine room, 23 hot air outlet, 24 inner pipe, 25 outer pipe, 26 A cooling fan, 27 is a fin, A is a high temperature side refrigeration cycle (refrigeration cycle), B is a low temperature side refrigeration cycle, C is a cold air region, W is cold air, W 'is hot air, x is a primary refrigerant (refrigerant), y is Secondary refrigerant.

Claims (1)

  A primary refrigerant compressor (5) that compresses the primary refrigerant (x), a primary refrigerant condenser (6) that condenses and liquefies the primary refrigerant (x), and a primary refrigerant decompression mechanism (7) that depressurizes the primary refrigerant (x). ) And the primary refrigerant evaporator (8) for evaporating the primary refrigerant (x) through the refrigerant pipe (13) and the high-temperature side refrigeration cycle (A) and the secondary refrigerant (y) are compressed. A secondary refrigerant compressor (9), a secondary refrigerant condenser (10) for condensing and liquefying the secondary refrigerant (y) by heat exchange with the primary refrigerant evaporator (8), a secondary refrigerant (y ), And a secondary refrigerant evaporator (12) for evaporating and evaporating the secondary refrigerant (y) via a refrigerant pipe (14) in sequence, A cold cycle (W) cooled by the secondary refrigerant evaporator (12). A refrigeration apparatus for a showcase for cooling the gas (4), wherein the showcase (4) has an inner pipe (24) constituting the primary refrigerant evaporator (8) and the secondary refrigerant condensing. Finned double-pipe heat exchanger (3) comprising an outer tube (25) constituting the vessel (10), and cooling fan (26) for cooling the finned double-pipe heat exchanger (3) And the hot air (W ′) heated by the finned double tube heat exchanger (3) is blown out forward of the bottom of the showcase (4). Showcase refrigeration equipment.

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