JPH10103800A - Composite type refrigerating plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance an overall efficiency. SOLUTION: A cold side device is provided with a cold storage side compressor 3, a condenser 4, a liquid receiver 22, a cold storage side evaporator 13 and a cold storage side evaporator 28. A freezing side device is provided with a freezing side compressor 2, a condenser 29 and a freezing side evaporator 19. A cascade condenser 24 heat-exchanges an evaporated refrigerant by the cold storage side evaporator 28 with a refrigerant gas flowing to the freezing side condenser 29 by unifying the cold storage side evaporator 28 with the freezing side evaporator 29 and condenses the refrigerant gas, thereby dropping the condensation temperature and increasing the degree of supercooling so that the overall efficiency may be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration showcase and a refrigeration showcase, and more particularly, to a combined refrigeration apparatus for efficiently supplying cold to cooling loads in different temperature zones such as an air conditioner indoor unit.

[0002]

2. Description of the Related Art For example, in a convenience store, a refrigerator and a refrigerator are installed as one set, or
Many of them have an indoor air conditioner added.
In such a case, a refrigerator may be provided for each of the loads for refrigeration, refrigeration, and air conditioning, and cold heat may be separately supplied to each load. Further, there is a case where the system of the high-pressure section is made common to the refrigeration and the refrigeration, and the low-pressure section is separately supplied to each load from the unit having the low-pressure section.

FIG. 5 is a diagram showing the structure of a combined refrigeration system in the latter case.

In the condensing unit 1, a refrigerating-side compressor 2, a refrigerating-side compressor 3, and a condenser 4 are arranged, and an outlet side of the refrigerating-side compressor 2 and the refrigerating-side compressor 3 is connected to a common high-pressure gas. The pipe 5 is connected to the condenser 4, and the high-pressure liquid pipe 6 on the outlet side of the condenser 4 is connected to a branch pipe 7 and a branch pipe 8 branched for refrigeration and freezing.

The branch pipe 7 is provided with a solenoid valve 9 and an expansion valve 10 and is connected to a low-pressure liquid pipe 11. The low-pressure liquid pipe 11 is connected to the inlet side of an evaporator 13 arranged in a refrigerated showcase 12. The low-pressure gas pipe 14 connected to the outlet side of the evaporator 13 is connected to the refrigerator 3.

[0006] Similarly, the branch pipe 8 is provided with an electromagnetic valve 15 and an expansion valve 16 and connected to the low-pressure liquid pipe 17.
7 is connected to the inlet side of an evaporator 19 disposed in the freezing showcase 18, while the low-pressure gas pipe 20 connected to the outlet side of the evaporator 19 is connected to the freezing side compressor 2.

According to this configuration, a high-pressure and high-temperature refrigerant gas is sent from a common high-pressure gas pipe 5 to one condenser 4, and a plurality of temperatures are supplied by a branch pipe 7 and a branch pipe 8 branched from the high-pressure liquid pipe 6. Cold heat can be supplied to the refrigerated showcase 12 and the frozen showcase 18, which are load units having different bands.

[0008]

However, the combined refrigeration system has a problem that the efficiency on the refrigeration side is poor.

[0009] That is, in FIG.
The high-pressure gas pipe 5 on the outlet side of the refrigeration compressor 3 is discharged at a high temperature and a high pressure, and the low-pressure liquid pipe 11 and the low-pressure gas pipe 14 on the refrigeration side are discharged.
Is relatively high in pressure also on the inlet side of the refrigeration-side compressor 3, and the refrigeration-side compressor 3 can be operated efficiently.

On the other hand, on the freezing side, the frozen showcase 18
Therefore, the low-pressure liquid pipe 17 and the low-pressure gas pipe 20 need to have a relatively low pressure, and the pressure on the inlet side of the freezing-side compressor 2 is low, and the efficiency is low. Is driving badly. Further, in order to maintain the inside temperature of the freezing showcase 18, the freezing side compressor 2 is used.
Is longer than that of the refrigeration-side compressor 3, which causes a reduction in overall efficiency.

Therefore, the present invention aims to improve the overall efficiency by harmonizing the respective efficiencies of the freezing side and the refrigerated side,
It is an object of the present invention to provide a combined refrigeration system that reduces the amount of refrigerant that causes environmental pollution and minimizes the amount of refrigerant released to the atmosphere due to leakage.

[0012]

According to a first aspect of the present invention, a refrigeration-side refrigeration cycle is formed by sequentially connecting a refrigeration-side compressor, a condenser, a liquid receiver, and a first refrigeration-side evaporator. A refrigeration-side apparatus including a second refrigeration-side evaporator, a refrigeration-side apparatus including a refrigeration-side compressor, a condenser, a receiver, and a refrigeration-side evaporator and sequentially connected to form a refrigeration-side refrigeration cycle; A cascade condenser for integrating the refrigeration-side evaporator and the refrigeration-side condenser and exchanging heat between the refrigerant evaporated by the second refrigeration-side evaporator and the refrigerant gas flowing to the refrigeration-side condenser to condense the refrigerant gas may be provided. It was made. According to this means, the refrigerant gas in the condenser on the freezing side is condensed by the refrigerant evaporated by the second refrigeration side evaporator. Thereby, the condensation temperature on the refrigeration side can be reduced, and the degree of supercooling of the refrigerant liquid can be increased. Therefore, since the refrigerating capacity of the refrigerating side increases, the overall efficiency including the refrigerating side can be improved.

According to a second aspect of the present invention, in the combined refrigerating apparatus according to the first aspect, the first refrigeration-side evaporator can exchange heat with the evaporated refrigerant and a brine liquid as a secondary refrigerant supplied to the refrigeration-side load unit. On the other hand, the refrigerating side evaporator is provided with a heat exchanging means capable of exchanging heat with the evaporated refrigerant and a brine liquid as a secondary refrigerant supplied to the refrigerating load unit. According to this means, the brine liquid is supplied to the refrigeration load unit and the refrigeration load unit, and the load is refrigerated or frozen. Therefore, the amount of refrigerant enclosed and the amount of refrigerant released to the atmosphere due to leakage can be minimized.

[0014] The invention of claim 3 is claim 1 or claim 2.
In the combined type refrigeration apparatus described above, a refrigeration-side condenser of the refrigeration-side refrigeration cycle is provided in parallel with a condenser disposed in the refrigeration-side refrigeration cycle, and the refrigeration-side condensation is performed by utilizing the condensation heat supplied to the condenser. The refrigerant gas of the vessel can be condensed. Further, a supercooler is arranged between the condenser and the liquid receiver so that the degree of supercooling of the refrigerant liquid on the freezing side can be increased. According to this means, the degree of supercooling on the freezing side increases, and the refrigerating capacity increases, so that the overall efficiency can be improved.

According to a fourth aspect of the present invention, an air conditioning side refrigeration cycle is formed by sequentially connecting an air conditioning side compressor, an air conditioning side condenser, a liquid receiver, and a first air conditioning side evaporator to form a second air conditioning side refrigeration cycle. An air-conditioning device including an evaporator; a refrigeration device including a refrigeration-side compressor, a condenser, a receiver, and a refrigeration-side evaporator and sequentially connected to form a refrigeration-side refrigeration cycle; A refrigeration-side device, which comprises a condenser, a receiver, and a refrigeration-side evaporator and is sequentially connected to form a refrigeration-side refrigeration cycle, and a second air-conditioning-side evaporator, a refrigeration-side condenser, and a refrigeration-side condenser integrated with each other Second
A cascade condenser for condensing the frozen gas by heat exchange between the refrigerant evaporated by the air-conditioning side evaporator and the refrigerant gas flowing to each of the condensers on the refrigeration side and the freezing side is provided. According to this means, the refrigerant gas in the condensers on the refrigeration side and the freezing side is condensed by the refrigerant evaporated by the second air conditioning side evaporator. As a result, the condensation temperatures on the refrigeration side and the freezing side are reduced, and the degree of supercooling of the refrigerant liquid is increased. Therefore, since the refrigerating capacity on the freezing side and the refrigerating side increases, the overall efficiency including the air conditioning side can be improved.

According to a fifth aspect of the present invention, in the combined refrigerating apparatus of the fourth aspect, the first air conditioner-side evaporator exchanges heat with the evaporated refrigerant and a brine liquid as a secondary refrigerant supplied to the air conditioner-side load unit. The refrigerating-side evaporator is provided with a heat-exchanging means capable of exchanging heat with the evaporated refrigerant and a brine liquid as a secondary refrigerant to be supplied to the refrigeration load unit. Is provided with a heat exchanging means capable of exchanging heat with the evaporated refrigerant and a brine liquid as a secondary refrigerant supplied to the refrigeration load unit. According to this means, the brine liquid is supplied to the air-conditioning-side load unit, the refrigeration-side load unit, and the freezing-side load unit, and each load is cooled, refrigerated, or frozen. Therefore, the amount of refrigerant enclosed and the amount of refrigerant released to the atmosphere due to leakage can be minimized.

The invention of claim 6 is the invention of claim 4 or claim 5.
In the combined refrigeration apparatus described above, the refrigeration-side condenser of the refrigeration-side refrigeration cycle and the refrigeration-side condenser of the refrigeration-side refrigeration cycle are provided side by side in correspondence with the air-conditioning-side condenser disposed in the air-conditioning-side refrigeration cycle. The refrigerant gas in the refrigeration-side condenser and the refrigeration-side condenser can be condensed using the heat of condensation supplied to the side condenser. In addition, a supercooler is arranged between the condenser and the liquid receiver so that the degree of supercooling of the refrigerant liquid on the refrigeration side and the freezing side can be increased. According to this means, the degree of supercooling on the refrigeration side and the freezing side increases and the refrigerating capacity increases, so that the overall efficiency can be improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a combined refrigerating apparatus showing a first embodiment of the present invention.

In the figure, condensing unit 1A
On the refrigeration side, the accumulator 2 passes through the refrigeration side compressor 3, the condenser 4, the liquid receiver 22, and the two refrigeration showcases 12.
3 and a high-pressure liquid pipe 6 and a low-pressure gas pipe 1 are arranged in parallel with the refrigeration showcase 12 while forming a refrigeration cycle on the refrigeration side.
4, a cascade capacitor 24 is connected.

On the other hand, on the refrigerating side of the condensing unit 1A, the refrigerating-side compressor 2, the cascade condenser 24, the receiver 25, the refrigerating showcase 18, and the accumulator 26 are connected in order to perform a refrigerating cycle on the refrigerating side. Has formed.

The cascade condenser 24 has an evaporator 28 having an inlet connected to the branch pipe 6a on the refrigeration side and an outlet connected to the low-pressure gas pipe 14, and a high-pressure gas pipe 5 connected to the inlet on the refrigeration side.
a, the outlet side of which is connected to the receiver 25
It is composed of

The two refrigerated showcases 12 are connected in parallel, and include a solenoid valve 9, an expansion valve 10, and an evaporator 13, respectively. Further, the freezing showcase 18 includes an electromagnetic valve 15, an expansion valve 16, and an evaporator 19.

With this configuration, cold load is supplied to each refrigerated showcase 12 by the refrigeration cycle on the refrigerated side to refrigerate the load, and expansion is performed via the electromagnetic valve 30 disposed in the branch pipe 6 a of the high-pressure liquid pipe 6. The liquid refrigerant is supplied to the valve 31. As a result, the liquid refrigerant evaporates in the evaporator 28 of the cascade condenser 24 and becomes low-temperature and low-pressure and flows out to the low-pressure gas pipe 14, while the high-temperature and high-pressure refrigerant gas in the corresponding condenser 29 on the freezing side is condensed and liquefied and received. Store in liquid container 25.

In this case, the high-temperature and high-pressure gas from the high-pressure gas pipe 5a on the refrigeration side flowing to the condenser 29 of the cascade condenser 24 is condensed by the evaporator 28 on the refrigeration side, so that the high pressure can be kept relatively low and the supercooling can be achieved. Can increase. Therefore, it is possible to reduce an increase in the compression ratio of the refrigerating-side compressor 2, prevent the efficiency of the refrigerating side from decreasing, and improve the overall efficiency of the refrigerating side and the refrigerating side.

FIG. 2 is a configuration diagram of a combined type refrigeration apparatus showing a second embodiment of the present invention.

FIG. 2 shows a first embodiment of the present invention.
In the second embodiment, a brine liquid as a second refrigerant is supplied to a plurality of refrigerated showcases 12 and a frozen showcase 18.

In the drawing, the evaporator 13 on the refrigeration side is connected to the low-pressure liquid pipe 11 on the inlet side, and connected to the low-pressure gas pipe 14 on the outlet side, so that the evaporator 13 can exchange heat with the evaporated refrigerant and the brine liquid. The heat exchange means 34 is provided. The heat exchange means 34 is connected to the refrigerated showcase 12 by a refrigerant pipe 35.
And a pump 36 supplies cold heat to a heat exchanger 38 via an electromagnetic valve 37 of the refrigerated showcase 12.

On the other hand, the evaporator 19 on the freezing side has the inlet side connected to the low-pressure liquid pipe 17 and the outlet side connected to the low-pressure gas pipe 20,
The evaporator 19 is provided with heat exchange means 40 for exchanging heat with the evaporated refrigerant to cool the brine liquid. This heat exchange means 40
Is connected to the refrigeration showcase 18 by a refrigerant pipe 41, and supplies cold heat to a heat exchanger 44 via a solenoid valve 43 of the refrigeration showcase 18 by a pump 42.

As described above, according to the second embodiment, since cold heat is supplied to the refrigerated showcase 12 and the frozen showcase 18 via the brine solution, the distance between the refrigerant pipes is reduced, and the amount of refrigerant charged in the refrigeration cycle is reduced. And the amount of refrigerant released to the atmosphere due to leakage can be minimized.

FIG. 3 is a configuration diagram of a combined type refrigeration apparatus showing a third embodiment of the present invention.

Referring to FIG. 3, FIG.
In the third embodiment, a condenser 4 is provided, and a high-pressure gas pipe 5a on the discharge side of the refrigerating-side compressor 2 is connected to a refrigerating condenser 4b to designate a refrigerating condenser. The output pipe of the condenser 4 b is connected to the subcooler 101 of the cascade condenser 24.

With this configuration, the high-pressure high-temperature refrigerant gas on the refrigeration side is condensed by the refrigeration condenser 4b, and further condensed by the supercooler 101 of the cascade condenser 24. As a result, the refrigeration side refrigerant liquid is supercooled by using the refrigeration side, and the refrigeration side refrigeration capacity is increased. Therefore, the efficiency of the refrigeration side is increased, and the overall efficiency can be improved.

FIG. 4 is a configuration diagram of a combined type refrigeration apparatus showing a fourth embodiment of the present invention.

In FIG. 4, the same reference numerals as those in FIG. 3 denote the same or corresponding parts, and the fourth embodiment forms a refrigeration cycle on the air-conditioning side and supplies cold heat to the air-conditioning indoor unit, while providing other heat. The efficiency is improved comprehensively in cooperation with the refrigeration side and the freezing side.

In the figure, on the air conditioning side, an air conditioning compressor 46 is provided.
The condenser 4c, the liquid receiver 47, the indoor unit 48 for air conditioning, and the accumulator 49 form a refrigeration cycle for air conditioning. And a branch pipe 5 branched from the high-pressure liquid pipe 50.
0a, a solenoid valve 51 and an expansion valve 52 are provided.
The evaporator 28 of the cascade condenser 24 is connected to the low-pressure liquid pipe 53 at the outlet of the evaporator 28, and the low-pressure gas pipe 54
Is connected. In the cascade condenser 24, the subcooler 101 on the freezing side, the subcooler 100 on the refrigeration side, and the evaporator 28 on the air conditioning side are integrated. Air conditioning indoor unit 48
Has an electromagnetic valve 55, an electromagnetic valve 56, and an evaporator 57, respectively.

With this configuration, in the refrigeration cycle for air conditioning,
The liquid refrigerant is supplied to the evaporator 57 of the indoor unit 48 for air conditioning, and the liquid refrigerant is supplied to the evaporator 28 of the cascade condenser 24. The evaporative refrigerant exchanges heat with the supercooler 101 and the supercooler 100 on the refrigeration side. Thus, the degree of supercooling of the refrigerant liquid on the freezing side and the refrigeration side is increased. As a result, the refrigerating capacity of the freezing side and the refrigerating side is increased, and a reduction in the efficiency of the freezing side and the refrigerating side is suppressed, and the overall efficiency is improved.

[0038]

As described above, according to the first aspect of the present invention, the refrigerant gas in the condenser on the freezing side is condensed by the refrigerant evaporated by the second refrigeration side evaporator, the condensing temperature is reduced, and the refrigerant liquid is condensed. Since the degree of supercooling can be increased, the overall efficiency can be improved including the refrigeration side where the refrigerating capacity increases.

According to the second aspect of the present invention, since the load is refrigerated or frozen by supplying the brine liquid to the refrigeration side load unit and the refrigeration side load unit, the refrigerant piping distance becomes extremely short, and the amount of refrigerant charged is reduced. . Further, the possibility of leakage is reduced, and the amount of refrigerant discharged into the atmosphere can be minimized.

According to the third aspect of the present invention, the degree of supercooling on the refrigeration side is increased by the subcooler, the refrigeration capacity is increased, and the overall efficiency can be improved.

According to the fourth aspect of the present invention, the refrigerant gas in the condensers on the refrigeration side and the refrigeration side is condensed by the refrigerant evaporated by the second air conditioner-side evaporator, and the condensing temperature (high pressure) is kept relatively low. The degree of cooling can be increased. Therefore, the efficiency of the compressor on the freezing side and the refrigerator side can be improved, and the overall efficiency including the air conditioning side can be improved.

According to the fifth aspect of the present invention, since the brine liquid is supplied to the air-conditioning side load unit, the refrigeration side load unit, and the freezing side load unit to cool, refrigerate, or freeze each load, the amount of refrigerant charged and the leakage are reduced. The amount of refrigerant discharged into the atmosphere can be minimized.

According to the invention of claim 6, since the refrigerating capacity on the refrigeration side and the freezing side is increased by the supercooler, the overall efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a combined refrigeration apparatus showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a combined refrigeration apparatus showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a combined refrigeration apparatus showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a combined refrigeration apparatus showing a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional combined refrigeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condensing unit 2 Refrigeration side compressor 3 Refrigeration side compressor 4,29 Condenser 4a Refrigeration condenser 4b Refrigeration condenser 4c Air conditioning condenser 5 High pressure gas pipe 6 High pressure liquid pipe 12 Refrigeration showcase 13 Evaporator 18 Refrigeration showcase 19,28 Evaporator 22,47 Liquid receiver 24 Cascade condenser 25 Liquid receiver 33 Heat exchanger 46 Air conditioning compressor 48 Air conditioning indoor unit 100,101 Subcooler

Claims (6)

[Claims] 1. A refrigeration-side apparatus comprising a refrigeration-side compressor, a condenser, a liquid receiver, and a first refrigeration-side evaporator and sequentially connected to form a refrigeration-side refrigeration cycle, and a second refrigeration-side evaporator. A refrigeration-side device that includes a refrigeration-side compressor, a condenser, a receiver, and a refrigeration-side evaporator and that is sequentially connected to form a refrigeration-side refrigeration cycle; a second refrigeration-side evaporator; And a cascade condenser for exchanging heat between the refrigerant evaporated by the second refrigeration side evaporator and the refrigerant gas flowing to the condenser on the refrigeration side to condense the refrigerant gas. apparatus. 2. The first refrigeration-side evaporator includes heat exchange means for exchanging heat with an evaporative refrigerant and a brine liquid as a secondary refrigerant to be supplied to a refrigeration-side load unit. 2. The combined refrigerating apparatus according to claim 1, further comprising a heat exchanging means for exchanging heat with the evaporating refrigerant and a brine liquid as a secondary refrigerant supplied to the refrigerating load unit. 3. A refrigeration-side condenser of the refrigeration-side refrigeration cycle is provided in association with the condenser disposed in the refrigeration-side refrigeration cycle, and the refrigeration is performed by utilizing condensation heat supplied to the condenser. 3. The refrigerant gas in the side condenser is condensed, and a supercooler is arranged between the condenser and the liquid receiver so that the degree of supercooling of the refrigerant liquid can be increased. Combined refrigeration equipment. 4. An air conditioner comprising an air conditioner-side compressor, an air conditioner-side condenser, a liquid receiver, and a first air conditioner-side evaporator and sequentially connected to form an air conditioner-side refrigeration cycle and a second air conditioner-side evaporator. A refrigeration-side device that includes a refrigeration-side compressor, a condenser, a receiver, and a refrigeration-side evaporator and that is sequentially connected to form a refrigeration-side refrigeration cycle; a refrigeration-side compressor, a condenser, and a receiver And a refrigerating side evaporator, which is sequentially connected to form a refrigerating side refrigerating cycle, and the second air conditioning side evaporator, the refrigerating side condenser, and the refrigerating side condenser are integrated. The second
A combined refrigeration apparatus comprising a cascade condenser for exchanging heat between refrigerant evaporated by an air conditioning-side evaporator and refrigerant gas flowing to each of the condensers on the refrigeration side and the freezing side to condense the refrigeration gas. 5. The refrigeration-side evaporator, wherein the first air-conditioner-side evaporator includes heat exchange means for allowing heat exchange between the evaporated refrigerant and a brine liquid as a secondary refrigerant to be supplied to the air-conditioning-side load unit. Further comprises heat exchange means capable of exchanging heat with the evaporative refrigerant and brine liquid as a secondary refrigerant to be supplied to the refrigeration load unit, and the refrigeration-side evaporator further comprises a secondary refrigerant supplied to the evaporative refrigerant and the refrigeration load unit. 5. The combined refrigeration apparatus according to claim 4, further comprising a heat exchange means capable of exchanging heat with a brine liquid as a refrigerant. 6. A refrigeration-side sub-condenser of the refrigeration-side refrigeration cycle and a refrigeration-side sub-condenser of the refrigeration-side refrigeration cycle are provided side by side corresponding to the air-conditioning-side condenser disposed in the air-conditioning-side refrigeration cycle. Utilizing the condensation heat supplied to the air-conditioning side condenser to condense the refrigerant gas of the refrigeration side condenser and the refrigeration side condenser, and a refrigeration side subcooler between the condenser and the receiver.
6. The combined refrigerating apparatus according to claim 4, wherein a refrigerating-side subcooler is arranged to increase the degree of subcooling of the refrigerating-side and refrigerating-side refrigerant liquids.