JP2001133051A - Refrigerant circuit equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide refrigerant circuit equipment to reliably cool compressor oil in a compressor without increasing capacity of a condenser to a value higher than an usual value and being influenced by a unit operation condition. SOLUTION: This refrigerant circuit equipment consists mainly of a refrigerant circuit 20 where a compressor 1, a condenser 2, a throttle device 4, and a vaporizer 3 are annularly interconnected through refrigerant piping 5. A circuit 7 for exclusive use in an oil cooler through which a compressor oil cooling part 17 situated in the compressor 1 and a refrigerant condensing part 16 situated in environment (, for example, refrigerant suction piping) having temperature lower than that of compressor oil in the compressor 1 are annularly interconnected through piping is independently situated separately from the refrigerant circuit 20. A refrigerant in the circuit 7 for exclusive use in an oil cooler is evaporated by the compressor oil cooling part 17 and condensed by the refrigerant condensing part 16 for circulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant circuit equipment provided with an oil cooler for cooling compressor oil in a compressor constituting a refrigerant circuit equipment for cooling an environment to be cooled.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional refrigerant circuit system equipped with an oil cooler type compressor. In the figure, reference numeral 1 denotes a compressor, 2A denotes a condenser, 3 denotes an evaporator, 4 denotes a throttle device, and these are connected in a ring through a refrigerant pipe 5 so that the refrigerant circuit 20 of the refrigerant circuit equipment is connected. Is configured. Reference numeral 6 denotes an oil cooler pipe which is drawn out of the condenser 2A and penetrates through the inside of the compressor 1, and is used for cooling the compressor oil in the compressor 1 by the refrigerant condensed in the condenser 2A. belongs to.

Next, the operation of the refrigerant circuit 20 in the conventional facility will be described with reference to FIG. The high-temperature, high-pressure gas refrigerant compressed by the compressor 1 radiates and condenses in the condenser 2A, and cools the oil in the compressor 1 through the oil cooler pipe 6. The refrigerant returned from the oil cooler pipe 6 is
The heat is again radiated and condensed in the condenser 2A, absorbed and evaporated in the evaporator 3 and returned to the compressor 1.

[0004]

However, when the compressor oil is cooled by using the refrigerant radiated by the condenser 2A of the refrigerant circuit 20 as in the conventional equipment, the refrigerant after cooling the compressor oil absorbs heat from the compressor oil. Therefore, it is necessary to release the heat again in the condenser 2A. That is, it is necessary to use the condenser 2 </ b> A having a larger capacity than usual because the heat absorbed by the compressor oil is dissipated.

[0005] Further, since the compressor oil is cooled by the refrigerant from the condenser 2A, the compressor oil can be cooled only within a heat amount range corresponding to the capacity of the condenser 2A (for example, 20% of the entire condenser capacity). On the other hand, although the amount of heat required for cooling the compressor oil is substantially constant regardless of the operating conditions,
When the capacity of A is small (for example, when the evaporation temperature is low), the compressor oil may not be sufficiently cooled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. By providing a circuit dedicated to an oil cooler independent of a refrigerant circuit, the condenser can be made larger than usual. It is an object of the present invention to provide a refrigerant circuit equipment capable of surely cooling compressor oil in a compressor without setting a capacity and without being influenced by unit operating conditions.

[0007]

In order to achieve the above object, the refrigerant circuit equipment according to the present invention employs the following technical means. That is, the refrigerant circuit equipment according to the first aspect of the present invention is disposed in the compressor in equipment mainly configured by a refrigerant circuit in which a compressor, a condenser, a throttle device, and an evaporator are pipe-connected in a ring shape. An oil cooler dedicated circuit in which a compressor oil cooling section and a refrigerant condensing section provided in an environment at a lower temperature than the compressor oil in the compressor are connected in an annular piping manner is provided independently of the refrigerant circuit, and an oil cooler dedicated circuit is provided. The refrigerant filled therein is configured to evaporate in the compressor oil cooling unit and condense and circulate in the refrigerant condensing unit.

Further, the refrigerant condensing section of the oil cooler dedicated circuit in the above configuration is of a water cooling type in which the coolant in the oil cooler dedicated circuit is cooled by cooling water.

In the above structure, the condenser of the refrigerant circuit is constituted by a water-cooled condenser for condensing the refrigerant from the compressor with the cooling water of the cooling water supply system.
The refrigerant condensing section of the oil cooler dedicated circuit is also cooled by common cooling water from the cooling water supply system.

Further, the refrigerant condensing portion of the oil cooler dedicated circuit in the above configuration is of an air cooling type in which the refrigerant in the oil cooler dedicated circuit is cooled by air.

In the above configuration, the condenser of the refrigerant circuit is constituted by an air-cooled condenser for condensing the refrigerant from the compressor by the blower of the blower, and the refrigerant condensing part of the exclusive circuit for the oil cooler is common to the blower. And air-cooled.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. Embodiment 1 of the Invention FIG. 1 is a configuration diagram showing a refrigerant circuit facility according to Embodiment 1 of the present invention, and reference numerals 1, 3 to 5
Indicate the same components as those of the conventional equipment (FIG. 6). These compressor 1, condenser 2 (no oil cooler piping 6), expansion device 4, and evaporator 3 are refrigerant piping 5
Are sequentially connected in a ring through the refrigerant circuit 2
0 is configured. Reference numeral 7 denotes an oil cooler dedicated circuit filled with a predetermined amount of refrigerant at a predetermined pressure. The oil cooler dedicated circuit 7 is configured as a refrigerant system independent of the refrigerant circuit 20. The oil cooler dedicated circuit 7 is provided in a compressor oil cooling section 17 provided in the compressor 1 and in an environment where the temperature of the compressor oil in the compressor 1 is lower than that of the compressor oil (for example, an outer surface of a refrigerant suction pipe of the compressor 1). The refrigerant condensing section 16 to be connected is connected in a ring shape by a refrigerant pipe. In this case, the compressor oil cooling section 17 is disposed at a position lower than the refrigerant condensing section 16 and other piping portions. As the refrigerant used in the oil cooler dedicated circuit 7, for example, Freon R22 used in the refrigerant circuit 20 is used. However, it is not always necessary to use the same type of refrigerant.

Next, the operation will be described. The operation of the refrigerant circuit 20 is substantially the same as the operation of the conventional equipment. The compressor oil in the compressor 1 that has become hot during the operation of the refrigerant circuit 20 is cooled by the refrigerant flowing through the compressor oil cooling section 17 of the oil cooler dedicated circuit 7. At this time, since the refrigerant in the compressor oil cooling unit 17 that evaporates by cooling the compressor oil is lighter than the liquid refrigerant, the refrigerant naturally rises in the oil cooler dedicated circuit 7 without using a pump or the like, and flows into the refrigerant condensing unit 16. Reach. The refrigerant that has reached the refrigerant condensing section 16 is cooled and condensed by the cold heat of the refrigerant suction pipe. Since the refrigerant thus condensed becomes heavier than the gas refrigerant, it naturally descends in the oil cooler dedicated circuit 7 and flows into the compressor oil cooling unit 17. That is, the refrigerant in the oil cooler dedicated circuit 7 evaporates in the compressor oil cooling unit 17 and condenses in the refrigerant condensing unit 16 to circulate. Let it cool. Note that the refrigerant in the oil cooler dedicated circuit 7 may be a forced circulation type using a pump or the like instead of the natural circulation type as described above.

As described above, in the refrigerant circuit equipment of the first embodiment, since the oil cooler exclusive circuit 7 for circulating the cooling refrigerant is provided independently of the refrigerant circuit 20, the capacity of the condenser of the refrigerant circuit 20 is increased. Need not be larger than usual. In addition, the compressor oil can be reliably cooled without being affected by the operating conditions of the equipment unit, and the equipment unit can be appropriately operated while maintaining the temperature of each part of the compressor 1 within the usage standard. In addition, in the case of the first embodiment, since the refrigerant naturally circulates in the oil cooler dedicated circuit 7,
There is no need to provide a new refrigerant circulation pump.

Embodiment 2 of the Invention FIG. 2 is a configuration diagram showing a refrigerant circuit facility according to Embodiment 2 of the present invention. In the figure, reference numerals 1 to 5, 7, 16, 17, and 20 are all the same as those in the first embodiment. Here, the refrigerant condensing section 16 of the oil cooler dedicated circuit 7 is provided in a water-cooled small water-cooled condenser 8 that cools the refrigerant in the oil cooler dedicated circuit 7 with cooling water from outside the system (regardless of the cold water source). Have been. Next, the operation will be described. According to the refrigerant circuit equipment of the second embodiment, the refrigerant in the oil cooler dedicated circuit 7 cools the compressor oil in the compressor 1 in the compressor oil cooling unit 17, so that the refrigerant evaporates and becomes light, and the small water-cooled condenser 8 is cooled. Reaches the refrigerant condensing section 16. The refrigerant that has reached the refrigerant condensing unit 16 is sufficiently cooled by the cooling water, condensed, and returns to the compressor oil cooling unit 17. In this case, the first embodiment is used.
In the same manner as described above, for example, if the refrigerant pipe of the oil cooler dedicated circuit 7 is provided with a height difference, the refrigerant in the oil cooler dedicated circuit 7 passes between the refrigerant condensing part 16 and the compressor oil cooling part 17 without using a pump or the like. Circulates naturally.

As described above, in the refrigerant circuit equipment according to the second embodiment, the refrigerant in the oil cooler dedicated circuit 7 is condensed by the water-cooled refrigerant condensing section 16. The refrigerant can be rapidly condensed, and the compressor oil can be cooled more rapidly, as compared with a configuration in which the refrigerant condensing section 16 is brought into contact with and cooled.

Embodiment 3 of the Invention FIG. 3 is a configuration diagram showing a refrigerant circuit facility according to Embodiment 3 of the present invention. In the figure, reference numerals 1 to 5, 7, 8, 16, 17, and 20 are all the same as those in the second embodiment. Here, the condenser of the refrigerant circuit 20 is configured to cool and condense the refrigerant from the compressor 1 by the cooling water generated by the existing cooling water supply system 18 including the water pipe 10, the water circulation pump 11, and the cooling tower 12. Of the water-cooled condenser 9. On the other hand, the refrigerant condensing section 16 of the oil cooler dedicated circuit 7 is provided in the small water cooled condenser 8 that cools the refrigerant in the oil cooler dedicated circuit 7 with cooling water from the cooling water supply system 18 that is common to the water cooled condenser 9. ing. Next, in the same manner as in the second embodiment, the refrigerant in the oil cooler dedicated circuit 7 naturally circulates and evaporates in the compressor oil cooling unit 17, thereby cooling the compressor oil in the compressor 1. Then, the evaporated refrigerant is cooled and condensed by the cooling water from the cooling water supply system 18 in the refrigerant condensing section 16 of the small water-cooled condenser 8, and then returns to the compressor oil cooling section 17.

As described above, in the refrigerant circuit equipment according to the third embodiment, when the compressor oil is to be cooled by water cooling, a small water-cooled type cooled by the common cooling water generated by the existing cooling water supply system 18 is used. Since the refrigerant condensing section 16 is provided in the water-cooled condenser 8, it is not necessary to provide new water piping, a water circulation pump, a cooling tower, and other facilities for the oil cooler dedicated circuit 7. Therefore, equipment costs can be kept low and space can be saved.

Embodiment 4 of the Invention FIG. 4 is a configuration diagram showing a refrigerant circuit facility according to Embodiment 4 of the present invention. In the figure, reference numerals 1 to 5, 7, 16, 17, and 20 are all the same as those in the first embodiment. Here, the refrigerant condensing section 16 of the oil cooler dedicated circuit 7 is provided in an air-cooled small air-cooled condenser 13 that cools the refrigerant in the oil cooler dedicated circuit 7 with surrounding cooling gas (air or the like). Next, the operation will be described. According to the refrigerant circuit equipment of the fourth embodiment, the refrigerant in the oil cooler dedicated circuit 7 cools and evaporates the compressor oil in the compressor 1 in the compressor oil cooling unit 17, and is cooled in the refrigerant condensing unit 16 of the small air-cooled condenser 13. It is condensed and circulated. Also in this case, as in the first embodiment, for example, if the refrigerant pipe of the oil cooler dedicated circuit 7 is provided with a height difference, the refrigerant in the oil cooler dedicated circuit 7 can be recirculated without forced circulation using a pump or the like. Circulates naturally.

As described above, in the refrigerant circuit equipment of the fourth embodiment, the refrigerant in the oil cooler dedicated circuit 7 is condensed in the refrigerant condensing section 16 provided in the small air-cooled air-cooled condenser 13. For example, the refrigerant can be rapidly condensed, and the compressor oil can be cooled more rapidly, as compared with the configuration in which the refrigerant condensing unit 16 is brought into contact with the refrigerant suction pipe or the like of the compressor 1 shown in the first embodiment for cooling. can do.

Embodiment 5 of the Invention FIG. 5 is a configuration diagram showing a refrigerant circuit facility according to Embodiment 5 of the present invention. In the figure, reference numerals 1 to 5, 7, 13, 16, 17, and 20 are all the same as those in the fourth embodiment. Here, the condenser of the refrigerant circuit 20 is configured by an existing air-cooled condenser 15 that condenses the refrigerant from the compressor 1 by blowing air from the existing blower 14. The refrigerant condensing section 16 of the oil cooler dedicated circuit 7 is also cooled in the small air-cooled condenser 13 arranged in the air passage from the blower 14 which is shared with the air-cooled condenser 15. In general, when the refrigerant in the oil cooler dedicated circuit 7 is condensed by the small air-cooled condenser 13, it is usually desirable to provide a blower or the like for the purpose of improving heat transfer performance and promoting condensation, and forcibly blowing air. However, in the refrigerant circuit equipment of the fifth embodiment, the air blower 14 is already provided for condensing the refrigerant in the refrigerant circuit 20 with the air-cooled condenser 15, and the small air-cooled condenser 13 is provided in the air passage of the blower 14. By disposing the blower 14
Is shared. As for the operation of the fifth embodiment, similarly to the fourth embodiment, the refrigerant in the oil cooler dedicated circuit 7 naturally circulates and evaporates in the compressor oil cooling unit 17, thereby cooling the compressor oil in the compressor 1. The evaporated refrigerant is supplied to the refrigerant condensing section 1 of the small air-cooled condenser 13.
After being cooled and condensed by the blow from the blower 14 in 6, the flow returns to the compressor oil cooling unit 17.

As described above, in the refrigerant circuit equipment according to the fifth embodiment, when the air-cooled condenser 15 for condensing the refrigerant from the compressor 1 by blowing air from the blower 14 is already used as the condenser of the refrigerant circuit 20. Since the refrigerant condensing section 16 is provided in the small air-cooled air-cooled condenser 13 that is commonly cooled by the blower 14, the compressor oil is cooled by air cooling. There is no need to provide a blower. This allows
Equipment costs can be kept low and space can be saved.

[0023]

Since the present invention is configured as described above, it has the following effects.
That is, according to the first aspect of the present invention, in the configuration employing the oil cooler system for cooling the compressor oil as the compressor cooling system for the refrigerant circuit, the oil cooler dedicated circuit for circulating the cooling refrigerant is separate from the refrigerant circuit. Since it is provided independently, there is no need to increase the capacity of the condenser more than usual. In addition, the compressor oil can be reliably cooled without being affected by the operating conditions of the equipment unit, and the equipment unit can be appropriately operated while maintaining the temperature of each part of the compressor within the usage standard. When the refrigerant is naturally circulated in the oil cooler dedicated circuit, there is no need to newly provide a refrigerant circulation pump or the like.

According to the second aspect of the present invention, the refrigerant in the oil cooler dedicated circuit is condensed in the water-cooled refrigerant condensing part, so that the refrigerant condensing part is brought into contact with, for example, a suction pipe of a compressor. The refrigerant can be rapidly condensed, and the compressor oil can be cooled more rapidly than in the case of cooling by cooling.

According to the third aspect of the present invention, when a water-cooled condenser for condensing the refrigerant from the compressor with the cooling water of the cooling water supply system is already used as the condenser of the refrigerant circuit, In order to cool the compressor oil by water cooling, new equipment such as water pipes, water circulation pumps, cooling towers, etc. was used because the water-cooled refrigerant condensing part cooled by the cooling water of No need to provide. Therefore, equipment costs can be kept low and space can be saved.

According to the fourth aspect of the present invention, the refrigerant in the oil cooler dedicated circuit is condensed in the air-cooled refrigerant condensing section. For example, the refrigerant condensing section is brought into contact with, for example, a suction pipe of a compressor. The refrigerant can be rapidly condensed, and the compressor oil can be cooled more rapidly than in the case of cooling by cooling.

According to the fifth aspect of the present invention, when an air-cooled condenser for condensing the refrigerant from the compressor by blowing air from the blower is already used as the condenser of the refrigerant circuit,
Since the air-cooled refrigerant condensing section cooled by the common blower is used in the oil cooler dedicated circuit, it is not necessary to newly provide a fan or the like for cooling the compressor oil by air cooling. Therefore, it is possible to reduce the equipment cost and save the space.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigerant circuit facility according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a refrigerant circuit facility according to Embodiment 2 of the present invention.

FIG. 3 is a configuration diagram of a refrigerant circuit facility according to Embodiment 3 of the present invention.

FIG. 4 is a configuration diagram of a refrigerant circuit facility according to Embodiment 4 of the present invention.

FIG. 5 is a configuration diagram of a refrigerant circuit facility according to Embodiment 5 of the present invention.

FIG. 6 is a configuration diagram showing conventional equipment of a refrigerant circuit equipment adopting an oil cooler method as a compressor cooling method.

[Explanation of symbols]

1 compressor, 2 condenser, 3 evaporator, 4 expansion device,
5 refrigerant piping, 7 oil cooler dedicated circuit, 8 small water-cooled condenser, 9 water-cooled condenser, 13 small air-cooled condenser,
14 blower, 15 air-cooled condenser, 16 refrigerant condenser,
17 compressor oil cooling section, 18 cooling water supply system, 2
0 Refrigerant circuit.

Claims (5)

[Claims] 1. An installation mainly comprising a refrigerant circuit in which a compressor, a condenser, a throttle device, and an evaporator are pipe-connected in an annular shape, wherein a compressor oil cooling unit provided in the compressor; An oil cooler dedicated circuit in which a refrigerant condensing unit disposed in a lower temperature environment than the compressor oil in the compressor is piped in an annular manner is provided separately from the refrigerant circuit, and is filled in the oil cooler dedicated circuit. Refrigerant circuit equipment, wherein the refrigerant is evaporated in the compressor oil cooling section and condensed and circulated in the refrigerant condensing section. 2. The refrigerant according to claim 1, wherein the refrigerant condensing section of the oil cooler exclusive circuit is configured to be a water-cooled type in which the coolant in the oil cooler exclusive circuit is cooled by cooling water. Circuit equipment. 3. The condenser of the refrigerant circuit comprises a water-cooled condenser for condensing the refrigerant from the compressor with the cooling water of the cooling water supply system, and the refrigerant condensing part of the oil cooler dedicated circuit also comprises the cooling water supply system. The refrigerant circuit equipment according to claim 2, wherein the refrigerant circuit equipment is cooled by a common cooling water from the refrigerant circuit. 4. The refrigerant circuit according to claim 1, wherein the refrigerant condensing section of the oil cooler exclusive circuit is configured to be an air-cooled type that cools the refrigerant in the oil cooler exclusive circuit by air. Facility. 5. The condenser of the refrigerant circuit is constituted by an air-cooled condenser for condensing the refrigerant from the compressor by blowing air from the blower, and the refrigerant condensing part of the oil cooler dedicated circuit is also provided in a common air passage from the blower. The refrigerant circuit equipment according to claim 4, wherein the refrigerant circuit equipment is disposed and air-cooled.