JPH11173725A - Refrigeration equipment for showcases - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To effectively use dead space in a placement room in a showcase refrigeration system using a dual refrigeration cycle. An outdoor unit having a compressor for a primary refrigerant x and a condenser for a primary refrigerant x, a decompression mechanism for a primary refrigerant x, an evaporator for a primary refrigerant x, and a compressor for a secondary refrigerant y. And a cascade unit 2 having a secondary refrigerant y condenser 10 for condensing and liquefying the secondary refrigerant y by heat exchange with the primary refrigerant evaporator 8, a secondary refrigerant decompression mechanism 11A, 11B and a secondary refrigerant y A piping connection unit 13A, 13B is provided on two adjacent side surfaces of the cascade unit 2 in a device including a plurality of showcase refrigeration units 3A, 3B having evaporators 12A, 12B, respectively. The pipe connection from two adjacent side surfaces of the cascade unit 2 to the showcase refrigeration units 3A and 3B can be made in two directions at right angles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system for a showcase, and more particularly to a refrigeration system for a showcase having a dual refrigeration cycle.

[0002]

2. Description of the Related Art As a conventional showcase refrigerating apparatus, a separate type refrigerating apparatus comprising an outdoor unit having a compressor and a condenser and a showcase refrigerating unit having a decompression mechanism and an evaporator is well known. I have.

[0003]

In the case of the conventional showcase refrigeration system having the above-described structure, the cooling capacity of the showcase refrigeration unit is reduced because the unitary refrigeration cycle is operated by one compressor. If you make it larger,
The temperature of the gas refrigerant that is returned from the showcase refrigeration unit to the outdoor unit decreases. Therefore, advanced technology is required for heat treatment for preventing heat from connecting pipes connecting the showcase refrigeration unit and the outdoor unit, resulting in an increase in cost. In addition, since a plurality of showcase refrigeration units are operated by one compressor, the compressor must be increased in size and power consumption increases.

In order to solve the above problem, it is conceivable to use a showcase refrigerating apparatus of a dual refrigerating cycle having an outdoor unit, a cascade unit and a showcase refrigerating unit. Must be installed in the showcase arrangement room, and the installation space becomes a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an object to provide a refrigeration system for a showcase using a binary refrigeration cycle so that the dead space in a showcase arrangement room can be effectively used. It is the purpose.

[0006]

According to a first basic configuration of the present invention (the first aspect of the present invention), as a means for solving the above-mentioned problems, a primary refrigerant compressor 5 for compressing a primary refrigerant x is provided.
An outdoor unit 1 having a primary refrigerant condenser 6 for condensing and liquefying the primary refrigerant x; a primary refrigerant decompression mechanism 7 for decompressing the primary refrigerant x; a primary refrigerant evaporator 8 for evaporating and evaporating the primary refrigerant x; Secondary refrigerant compressor 9 for compressing refrigerant y
A cascade unit 2 having a secondary refrigerant condenser 10 for condensing and liquefying the secondary refrigerant y by heat exchange with the primary refrigerant evaporator 8; and a secondary refrigerant decompression mechanism 11A, which decompresses the secondary refrigerant y. , And a plurality of showcase refrigeration units 3A, 3B each having evaporators 12A, 12B,... For evaporating and evaporating the secondary refrigerant y.
In the showcase refrigeration system including the showcases 4A, 4B,.. Are provided respectively.

[0007] With the above configuration, pipe connection from two adjacent side surfaces 2a, 2b of the cascade unit 2 to the showcase refrigeration units 3A, 3B,... Can be made in two directions at right angles, resulting in dead space. The cascade unit 2 can be arranged at the corner 14a of the showcase arrangement room 14. Therefore, while contributing to space saving, the cascade unit 2 can be increased in size. Further, when the cascade unit 2 is arranged at the corner 14a of the showcase arrangement room 14, the piping direction to the outdoor unit 1 can be selected from two directions, and the installation location of the outdoor unit 1 is selected according to the outdoor environment. You can also. Moreover, unlike the conventional one-way refrigeration cycle, sophisticated technology is not required for the heat treatment of the outdoor connecting pipe, and energy saving can be achieved by downsizing the compressor.

The cascade unit 2 is connected to the showcases 4A, 4B,.
Are arranged at the corners 14a in the room 14 in which the display cases are arranged, the showcases 4A, 4B,... Can be arranged near the wall, and the space of the showcase arrangement room 14 can be used effectively.

In the second basic configuration of the present invention (the invention of claim 3), as means for solving the above problems, a primary refrigerant compressor 5 for compressing the primary refrigerant x and a primary refrigerant x
An outdoor unit 1 having a primary refrigerant condenser 6 for condensing and liquefying the refrigerant, a primary refrigerant decompression mechanism 7 for decompressing the primary refrigerant x,
A primary refrigerant evaporator 8 for evaporating and evaporating the primary refrigerant x, a secondary refrigerant compressor 9 for compressing the secondary refrigerant y, and a secondary refrigerant y for condensing and liquefying the secondary refrigerant y by heat exchange with the primary refrigerant evaporator 8. Cascade unit 2 having secondary refrigerant condenser 10
And a showcase 4 incorporating a plurality of showcase refrigeration units 3 having a secondary refrigerant decompression mechanism 11 for decompressing the secondary refrigerant y and a secondary refrigerant evaporator 12 for evaporating the secondary refrigerant y. In the refrigeration apparatus for a showcase provided, the cascade unit 2 is disposed on the bottom 4 a of the showcase 4.

With the above configuration, the arrangement of the cascade units 2 can be obtained by effectively utilizing the dead space formed at the bottom 4a of the showcase 4. Therefore, the space can be saved, and the cascade unit 2 is not seen from the outside. Moreover, unlike the conventional one-way refrigeration cycle, sophisticated technology is not required for the heat treatment of the outdoor connecting pipe, and energy saving can be achieved by downsizing the compressor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment (Corresponding to Claims 1 and 2) FIGS. 1 to 3 show a showcase refrigeration apparatus according to a first embodiment of the present invention.

As shown in FIG. 1, the showcase refrigeration apparatus includes an outdoor unit 1 having a primary refrigerant compressor 5 for compressing a primary refrigerant x and a primary refrigerant condenser 6 for condensing and liquefying the primary refrigerant x. , A primary refrigerant decompression mechanism 7 for decompressing the primary refrigerant x, a primary refrigerant evaporator 8 for evaporating the primary refrigerant x, a secondary refrigerant compressor 9 for compressing the secondary refrigerant y, and the primary refrigerant evaporator 8 Cascade unit 2 having a secondary refrigerant condenser 10 for condensing and liquefying the secondary refrigerant y by heat exchange with the secondary refrigerant decompression mechanisms 11A and 11B for decompressing the secondary refrigerant y and evaporating the secondary refrigerant y. Showcases 4A and 4B are respectively provided with two showcase refrigeration units 3A and 3B each having a secondary refrigerant evaporator 12A and 12B to be vaporized.

In the refrigeration system for a showcase having the above structure, the primary refrigerant x pressure-fed from the primary refrigerant compressor 5 is used.
After being condensed and liquefied in the condenser 6 for the primary refrigerant, the pressure is reduced by the decompression mechanism 7 for the primary refrigerant, then vaporized and evaporated in the evaporator 8 for the primary refrigerant, and returned to the compressor 5 for the primary refrigerant.

On the other hand, the secondary refrigerant y pumped from the secondary refrigerant compressor 9 is condensed and liquefied by heat exchange with the primary refrigerant evaporator 8 in the secondary refrigerant condenser 10 and then condensed and liquefied. The pressure is reduced by the refrigerant decompression mechanisms 11A and 11B, then evaporated and vaporized by the secondary refrigerant evaporators 12A and 12B, and returned to the secondary refrigerant compressor 9. Accordingly, the showcases 4A, 4B are cooled by evaporating the secondary refrigerant y, which has been cooled to a low temperature by heat exchange with the primary refrigerant evaporator 8, in the secondary refrigerant evaporators 12A, 12B. In this case, the temperature of the gas refrigerant that is recirculated from the primary refrigerant evaporator 8 to the primary refrigerant compressor 5 can be suppressed to about the level of a normal air conditioner. It does not require advanced technology.

On two adjacent side surfaces 2a and 2b of the cascade unit 2, pipe connection portions 13A, 13A and 13A to the showcase refrigeration units 3A and 3B are provided.
B and 13B are provided respectively.

In this manner, the cascade unit 2
The pipe connection from two adjacent side surfaces 2a, 2b to the showcase refrigeration units 3A, 3B can be made in two directions at right angles. Therefore, as shown in FIG. 2, when the showcases 4A and 4B are arranged near the wall, the cascade unit 2 can be arranged at the corner 14a of the showcase arrangement chamber 14, which is a dead space, and the space can be saved. In addition to contributing, the corner 14a becomes a dead space in the vertical direction, so that the cascade unit 2 can be increased in size. For example, as shown in FIG. 3, two corners 14a, 1 of the showcase arrangement room 14 are provided.
By arranging the cascade units 2 and 2 in the 4a, the showcases 4A, 4B,... Can be arranged along the three walls W in the showcase arrangement room 14, and the space of the showcase arrangement room 14 is effectively used. Can be used.

Further, as described above, when the cascade unit 2 is arranged at the corner 14a of the showcase arrangement room 14, the piping direction to the outdoor unit 1 can be selected from two directions. The location can be selected according to the outdoor environment. Moreover, unlike the conventional one-way refrigeration cycle, sophisticated technology is not required for the heat treatment of the outdoor connecting pipe, and energy saving can be achieved by downsizing the compressor.

Second Embodiment (Corresponding to Claim 3) FIG. 4 shows a showcase refrigeration apparatus according to a second embodiment of the present invention.

In this case, the cascade unit 2 is arranged on the bottom 4a of the showcase 4. In this way, the arrangement of the cascade units 2 that effectively uses the dead space formed at the bottom 4a of the showcase 4 can be obtained. Therefore, the space can be saved, and the cascade unit 2 is not seen from the outside. The other configuration and operation and effect are the same as those in the first embodiment, and the description is omitted.

[0021]

According to the first basic configuration of the present invention (the invention of claim 1), the primary refrigerant compressor 5 for compressing the primary refrigerant x and the primary refrigerant condenser 6 for condensing and liquefying the primary refrigerant x. An outdoor unit 1 having a primary refrigerant x, a primary refrigerant decompression mechanism 7 for decompressing the primary refrigerant x, a primary refrigerant evaporator 8 for evaporating the primary refrigerant x, a secondary refrigerant compressor 9 for compressing the secondary refrigerant y, and A cascade unit 2 having a secondary refrigerant condenser 10 for condensing and liquefying the secondary refrigerant y by exchanging heat with the primary refrigerant evaporator 8, and a secondary refrigerant decompression mechanism 11A, 11B for decompressing the secondary refrigerant y. A plurality of showcase refrigeration units 3A, each having a secondary refrigerant evaporator 12A, 12B for evaporating and evaporating the secondary refrigerant y.
Showcases 4A, 4B
In the showcase refrigeration system provided with the above, pipe connection parts 13A, 13B,... To the showcase refrigeration units 3A, 3B,. Since the pipe connection from two adjacent side surfaces 2a, 2b of the cascade unit 2 to the showcase refrigeration units 3A, 3B,... The cascade unit 2 can be disposed in the portion 14a, which contributes to space saving and has an excellent effect that the cascade unit 2 can be increased in size.

When the cascade unit 2 is arranged at the corner 14a of the showcase arrangement room 14, the piping direction to the outdoor unit 1 can be selected from two directions, and the installation location of the outdoor unit 1 can be changed to the outdoor environment. It can also be selected accordingly.

In addition, unlike the conventional one-way refrigeration cycle, a high level of technology is not required for preventing heat treatment of the outdoor connecting pipe, and energy saving can be achieved by downsizing the compressor.

As in the second aspect of the present invention, the cascade unit 2 is connected to the showcases 4A, 4B,.
Are arranged at the corners 14a in the room 14 in which the display cases are arranged, the showcases 4A, 4B,... Can be arranged near the wall, and the space of the showcase arrangement room 14 can be used effectively.

According to the second basic configuration of the present invention (invention of claim 3), a primary refrigerant compressor 5 for compressing the primary refrigerant x and a primary refrigerant condenser 6 for condensing and liquefying the primary refrigerant x.
An outdoor unit 1 having a primary refrigerant x, a primary refrigerant decompression mechanism 7 for decompressing the primary refrigerant x, a primary refrigerant evaporator 8 for evaporating the primary refrigerant x, a secondary refrigerant compressor 9 for compressing the secondary refrigerant y, and A cascade unit 2 having a secondary refrigerant condenser 10 for condensing and liquefying the secondary refrigerant y by exchanging heat with the primary refrigerant evaporator 8; a secondary refrigerant decompression mechanism 11 for depressurizing the secondary refrigerant y; A showcase refrigerating apparatus comprising: a plurality of showcase refrigerating units 3 each having a secondary refrigerant evaporator 12 for evaporating and evaporating the refrigerant y;
Is arranged on the bottom 4a of the showcase 4 so that the arrangement of the cascade units 2 can be obtained by effectively using the dead space formed on the bottom 4a of the showcase 4, so that space can be saved. Can be done,
There is an excellent effect that the cascade unit 2 is not seen from the outside. Moreover, unlike the conventional one-way refrigeration cycle, advanced technology is not required for preventing heat treatment of the outdoor communication pipe, and energy saving can be achieved by downsizing the compressor.

[Brief description of the drawings]

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 partial plan view showing the arrangement of the showcase refrigeration apparatus in the showcase arrangement room according to the first embodiment of the present invention.

FIG. 3 is a plan view showing an example of a showcase arrangement in the showcase refrigeration apparatus according to the first embodiment of the present invention.

FIG. 4 is a refrigerant circuit diagram of a showcase refrigeration apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

1 is an outdoor unit, 2 is a cascade unit, 3, 3
A, 3B ... are refrigeration units for showcases, 4, 4
A, 4B,... Are showcases, 4a is a bottom portion, 5 is a primary refrigerant compressor, 6 is a primary refrigerant condenser, 7 is a primary refrigerant pressure reducing mechanism, 8 is a primary refrigerant evaporator, and 9 is a secondary refrigerant. Compressor, 10 is a secondary refrigerant condenser, 11, 11A, 11B
Is a pressure reducing mechanism for a secondary refrigerant, 12, 12A and 12B are evaporators for a secondary refrigerant, 13A and 13B are pipe connection portions, and
Is a showcase arrangement room, 14a is a corner, x is a primary refrigerant,
y is a secondary refrigerant.

Claims (3)

[Claims] An outdoor unit (1) having a primary refrigerant compressor (5) for compressing a primary refrigerant (x) and a primary refrigerant condenser (6) for condensing and liquefying the primary refrigerant (x); A primary refrigerant decompression mechanism (7) for decompressing (x), a primary refrigerant evaporator (8) for evaporating the primary refrigerant (x),
A secondary refrigerant condenser (9) that condenses and liquefies the secondary refrigerant (y) by heat exchange with the secondary refrigerant compressor (9) that compresses the secondary refrigerant (y) and the primary refrigerant evaporator (8). A cascade unit (2) having a pressure reducing mechanism (11A), (11B),... For reducing the pressure of the secondary refrigerant (y).
And a plurality of showcase refrigeration units (3A), (3B)... Each having a secondary refrigerant evaporator (12A), (12B)... For evaporating and evaporating the secondary refrigerant (y). Case (4A), (4B)
A refrigeration apparatus for a showcase, comprising two adjacent side surfaces (2a), (2) of the cascade unit (2).
b) includes the refrigeration unit for a showcase (3A),
(3B) ・ ・ Piping connection to (13A), (13B) ・
A refrigeration system for a showcase, characterized in that a refrigerator is provided. 2. The cascade unit (2) is provided at a corner (14a) in a room (14) in which the showcases (4A), (4B)... Are arranged. The refrigeration system for a showcase according to claim 1. 3. An outdoor unit (1) having a primary refrigerant compressor (5) for compressing a primary refrigerant (x) and a primary refrigerant condenser (6) for condensing and liquefying the primary refrigerant (x); A primary refrigerant decompression mechanism (7) for decompressing (x), a primary refrigerant evaporator (8) for evaporating the primary refrigerant (x),
A secondary refrigerant condenser (9) that condenses and liquefies the secondary refrigerant (y) by heat exchange with the secondary refrigerant compressor (9) that compresses the secondary refrigerant (y) and the primary refrigerant evaporator (8). 10) a cascade unit (2) having a secondary refrigerant (y), a secondary refrigerant decompression mechanism (11) for decompressing the secondary refrigerant (y), and a secondary refrigerant evaporator (12) for evaporating and evaporating the secondary refrigerant (y). And a showcase (4) having a built-in showcase refrigeration unit (3) having the cascade unit (2) on the bottom (4a) of the showcase (4). A refrigeration unit for a showcase, which is provided.