JPH0343593Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a refrigeration system used in marine containers and the like.

(Prior art) In refrigeration equipment used for marine containers, etc., a water-cooled condenser is attached in series with the air-cooled condenser because it may not be possible to operate the air-cooled condenser depending on the usage environment. It is well known that when an air-cooled condenser cannot be operated, a water-cooled condenser is operated instead (for example,
(Refer to Japanese Patent Application Laid-open No. 122863/1983).

In addition, in a refrigeration system with such a configuration,
In order to use the water-cooled condenser as a receiver for a liquid reservoir during air-cooled operation, the water-cooled condenser is usually provided below the outlet side of the air-cooled condenser.

(Problems to be Solved by the Invention) As disclosed in the prior art section above, when a refrigeration system having a water-cooled condenser installed on the outlet side of an air-cooled condenser is operated in water-cooled mode, the high temperature discharged from the compressor (i.e. ,
The gas refrigerant (approximately 120℃) will be supplied to the water-cooled condenser via the air-cooled condenser, but at this time the operation of the fan for cooling the air-cooled condenser is stopped.
The temperature of the air-cooled condenser itself rises, and the air temperature in the chamber in which the air-cooled condenser is installed rises due to heat radiation from the air-cooled condenser. Such an increase in air temperature within the condenser chamber may have a thermal effect on equipment disposed above it. For example, in a device such as the marine container A shown in FIG. 2, in which the electrical component box 10 must be disposed directly above the air-cooled condenser 3, As a result of the increase in the ambient temperature of the electrical component box 10 due to the increase in air temperature, the temperature within the electrical component box 10 exceeds the allowable temperature limit of the electrical components, resulting in a problem of reduced reliability.

This invention was made in view of the above points,
The purpose is to suppress the temperature rise of the air-cooled condenser by lowering the temperature of the gas refrigerant supplied to the air-cooled condenser in advance during water-cooled operation.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, as shown in the drawings, a compressor 2, an air-cooled condenser 3, a water-cooled condenser 4, an expansion mechanism 5, and an evaporator are provided. Vessel 6
In the refrigeration system, the refrigeration system has a refrigerant cycle in which the air-cooled condenser 3 is connected in series, and a device 10 that is easily affected by heat, such as an electrical component box, is arranged directly above the air-cooled condenser 3. A water heat exchanger 13 for cooling the refrigerant, which operates only during water cooling operation, is attached to the inlet side of the refrigerant.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, during water-cooled operation, the high temperature (approximately 120° C.) gas refrigerant discharged from the compressor 2 is cooled by the water heat exchanger 13 and then supplied to the water-cooled condenser 4 via the air-cooled condenser 3. The gas refrigerant supplied to the air-cooled condenser 3 which is not in operation is precooled by the water heat exchanger 13 and has a relatively low temperature (approximately 60° C.). Therefore, the amount of heat dissipated due to the temperature rise of the air-cooled condenser 3 is reduced, and the thermal influence on the equipment 10 (for example, electrical parts, etc.) installed above the air-cooled condenser 3 is significantly suppressed. be.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The refrigeration system according to this embodiment is applied to the marine container A shown in FIG.

In the marine container A, a compressor 2 and a water-cooled condenser 4 are arranged at the inner bottom of the casing 1,
An air-cooled condenser 3 is disposed above it, and air-cooled fans 8, 8 for the air-cooled condenser and electric component boxes 10, 10 are further disposed above it. At the back of the inlet panels 11, 11 is an evaporator 6, which will be described later.
is located.

As shown in FIG. 1, the refrigeration system used in the marine container A of this embodiment includes a compressor 2, a three-way proportional valve 12, a water heat exchanger 13, an air-cooled condenser 3, a water-cooled condenser 4, and an expansion mechanism. It has a refrigerant cycle in which a functioning expansion valve 5, an evaporator 6, and an accumulator 7 are successively connected in series through refrigerant piping. Reference numeral 8 is an air cooling fan for the air-cooled condenser, and 9 is an evaporator fan. In this embodiment, an electrical component box 10 is placed above the air-cooled condenser 3 as a device that is easily affected by heat.

In the three-way proportional valve 12, the inlet port 12a is connected to the discharge side of the compressor 2, and the first outlet port 12b is connected to the inlet side of the air-cooled condenser 3 (actually, the inlet side of the water heat exchanger 13). , second outlet side port 12
c are respectively connected to the inlet side of the evaporator 6, and the amount of refrigerant supplied to the air-cooled condenser 3 side and the evaporator 6 side is distributed proportionally by controlling the opening degree of the outlet side ports 12b and 12c. It is configured.

The water heat exchanger 13 is for pre-cooling the high temperature (i.e., about 120°C) refrigerant discharged from the compressor 2 to about 60°C during water cooling operation. The thirteen cooling water passages 13a are connected to the cooling water passage 4a of the water-cooled condenser 4.
That is, the cooling water passage 1 of the water heat exchanger 13 passes from the cooling water inlet 14 to the cooling water passage 4a of the water-cooled condenser 4.
The cooling water supplied to 3a condenses and liquefies the refrigerant in the water-cooled condenser 4, pre-cools the gas refrigerant discharged from the compressor 2 in the water heat exchanger 13, and is discharged from the cooling water outlet 15. There is.

() During air cooling operation At this time, the compressor 2, air cooling fan 8, and evaporator fan 9 are being driven. Therefore, compressor 2
After being condensed and liquefied in the air-cooled condenser 3, the gas refrigerant discharged from the air-cooled condenser 3 is depressurized in the expansion valve 5 and supplied to the evaporator 6, where it is evaporated and used for cooling the air inside the marine container A. and then returned to the compressor 2. Note that the cooling capacity of the evaporator 6 is controlled by refrigerant distribution by a three-way proportional valve 12. At this time, the water-cooled condenser 4 and the water heat exchanger 1
3 has been stopped, the water heat exchanger 13 does not work, and the gas refrigerant to the air-cooled condenser 3 is maintained at a high temperature, while the water-cooled condenser 4 stores surplus liquid refrigerant. It will be used as a receiver for

() During water cooling operation At this time, the compressor 2 and the evaporator fan 9 are driven, the air cooling fan 8 is stopped, and cooling water is being supplied from the cooling water inlet 14. Therefore, the high temperature (approximately 120°C) gas refrigerant discharged from the compressor 2 is precooled by the water heat exchanger 13 and becomes relatively low temperature (approximately 60°C) gas refrigerant, which is then transferred to the air-cooled condenser 3. However, from the point where the air cooling fan 8 is stopped, it is supplied to the water-cooled condenser 4 in a state of natural heat radiation. After being condensed and liquefied in the water-cooled condenser 4, it is depressurized in the expansion valve 5 and supplied to the evaporator 6, where it is evaporated and used for cooling the air inside the marine container A, and then compressed. Returned to aircraft 2. As mentioned above, since the gas refrigerant supplied to the air-cooled condenser 3 is pre-cooled by the water heat exchanger 13, the amount of heat released from the air-cooled condenser 3 is significantly reduced. The influence of heat on the electrical component box 10 installed above is greatly suppressed.

() During defrost and heating operation At this time, only the compressor 2 and evaporator fan 9 are driven, and the second outlet port 1 of the three-way proportional valve 12
2c is said to be fully open. Therefore, the high temperature gas refrigerant discharged from the compressor 2 is directly supplied to the evaporator 6, and is used to melt frost adhering to the evaporator 6 or to heat the air inside the refrigerator. Therefore, since the high-temperature gas refrigerant before entering the water heat exchanger 13 is directly supplied to the evaporator 6, the defrosting ability and heating ability are not reduced.

It goes without saying that the present invention is not limited to the illustrated embodiment of the refrigeration system for marine containers, but is also applicable to refrigeration systems used for various other purposes.

Further, the present invention is not limited to the structure shown in the drawings, and it goes without saying that the design can be changed as appropriate without departing from the gist of the invention.

(Effects of the invention) As described above, the present invention has a refrigerant cycle in which the compressor 2, the air-cooled condenser 3, the water-cooled condenser 4, the expansion mechanism 5, and the evaporator 6 are connected in series. In addition, in a refrigeration system having a configuration in which equipment 10 that is easily affected by heat, such as an electrical component box, is arranged directly above the air-cooled condenser 3, the air-cooled condenser 3
A water heat exchanger 13 for cooling the refrigerant, which acts only during water cooling operation, is attached to the inlet side of the compressor 2, so that the high temperature gas refrigerant discharged from the compressor 2 flows into the water heat exchanger 13 during water cooling operation. After being cooled, the gas refrigerant is supplied to the water-cooled condenser 4 via the air-cooled condenser 3 to be condensed and liquefied. Vessel 1
It is pre-cooled by 3 and has a relatively low temperature.
Since the temperature rise of the air-cooled condenser 3 is suppressed, the equipment 10 installed above the air-cooled condenser 3
This has the practical effect of greatly suppressing thermal effects on (for example, electrical parts, etc.) and greatly contributing to improved reliability.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant system diagram of a refrigeration system according to an embodiment of the present invention, and FIG. 2 is a front view of a marine container equipped with a refrigeration system according to an embodiment of the present invention. 2... Compressor, 3... Air-cooled condenser, 4... Water-cooled condenser, 5... Expansion mechanism, 6... Evaporator, 10...
...Equipment that is easily affected by heat (electrical parts box),
13... Water heat exchanger.

Claims (1)

[Scope of utility model registration request] It has a refrigerant cycle in which a compressor 2, an air-cooled condenser 3, a water-cooled condenser 4, an expansion mechanism 5, and an evaporator 6 are successively connected in series, and directly above the air-cooled condenser 3 there is a heat pump for electric parts boxes, etc. In a refrigeration system having a configuration in which susceptible equipment 10 is arranged,
A refrigeration system characterized in that a water heat exchanger 13 for cooling the refrigerant is attached to the inlet side of the air-cooled condenser 3, which acts only during water-cooling operation.