JP3155653B2 - Refrigeration equipment using mixed refrigerant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system using a mixed refrigerant as a refrigerant.

[0002]

2. Description of the Related Art A refrigeration system using a mixed refrigerant can control the capacity and improve the performance by making the composition ratio of the refrigerant circulating in the refrigeration cycle variable.

As means for changing the composition ratio of the mixed refrigerant, for example, Japanese Patent Application Laid-Open No. 61-86537 in which a refrigerant tank for storing the mixed refrigerant is provided in a refrigeration cycle, or in series with a reservoir for storing the mixed refrigerant Japanese Patent Application Laid-Open No. 1-21075 in which a rectifying separator in which a filler is enclosed is provided in a refrigeration cycle.
No. 9 is known.

[0004]

As described above, the composition ratio of the circulating refrigerant can be varied by storing the mixed refrigerant in the refrigerant tank or the storage device at a different ratio. This makes it possible to perform operation with a suitable refrigerant corresponding to the operation conditions.However, in the former provided with the storage tank, it is possible to use only a mixed refrigerant having a significantly different boiling point, and the boiling point is close. There is a problem that cannot be applied to the mixed refrigerant and the azeotropic mixed refrigerant.

[0005] The latter, in which the storage device and the rectification separator are provided in series, increases the number of parts and is not desirable in terms of assemblability and cost.
Maintenance and management is troublesome, and lubricating oil enclosed in the refrigeration system adheres to the passage of the refrigerant, and there are some difficulties in practical use.

Accordingly, the present invention provides a refrigeration using a mixed refrigerant which is capable of controlling the composition ratio without being influenced by the conditions of the mixed refrigerant such as azeotropic and non-azeotropic and has excellent control response. It is intended to provide a device.

[0007]

According to one aspect of the present invention , a compressor, a four-way valve,
Consists of a use side heat exchanger, a heat source side heat exchanger, and a decompression device
A refrigerant storage container is provided in the circuit of the refrigeration cycle,
Refrigeration oil that allows the mixed refrigerant to melt
Enter. According to the second aspect of the present invention , the mixed refrigerant is melted in a circuit of a refrigeration cycle including a compressor, a four-way valve, a use side heat exchanger, a heat source side heat exchanger, and a pressure reducing device. > While providing a refrigerant storage container in which refrigerating machine oil capable of being filled is provided, a control means for applying a pressure or temperature change to the refrigerating machine oil in the refrigerant storage container is provided. Further, claim 3 of the present invention
In the case of, the control means is connected to the inlet and outlet of the refrigerant storage container.
Open / close valve that opens and closes the circuit on the side, or directly adds a refrigerant storage container.
A heating device for heating.

[0008]

According to the refrigerating apparatus of the first aspect using the mixed refrigerant, the refrigerating apparatus in which the mixed refrigerant is melted in the refrigerant storage container.
Machine oil is sealed, so mixed refrigerants such as azeotropic and non-azeotropic
Control of composition ratio of mixed refrigerant without being affected by conditions
And at a faster rate than the adsorption reaction to solid substances, etc.
Control response is improved because of the ability to perform a stable reaction. Also,
According to the refrigeration apparatus of claim 2, the mixed refrigerant circulating in the refrigeration cycle, corresponding to the operating condition by the control means good
Suitable composition ratio can be controlled, and a wide range of capacity control can be performed quickly.
In addition to being able to operate quickly, efficient operation can be performed.

Further , according to the refrigeration apparatus of the third aspect, the refrigerant
Enables quick and accurate pressure or temperature control of storage vessels.
Thus, the composition ratio of the mixed refrigerant can be controlled quickly and accurately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows a heat pump type refrigerating apparatus in which a mixed refrigerant using R32 and R134a having different properties and having different properties with respect to a refrigerating machine oil 15 to be described later is used as a refrigerant depending on, for example, pressure and temperature conditions. . The refrigeration apparatus includes a compressor 1, a use side heat exchanger 3,
It has a heat source side heat exchanger 5 and a decompression device 7, and has a refrigeration operation,
By operating the four-way valve 9 according to the heating operation, the compressor 1
Is flowed toward the use side heat exchanger 3 as shown by the dotted arrow or toward the heat source side heat exchanger 5 as shown by the solid arrow, and the switching control corresponding to the operation mode becomes possible. I have.

A refrigerant storage container 13 is provided in the circuit 11 constituting the refrigeration cycle in parallel with the pressure reducing device 7, and a refrigerant oil 15 capable of dissolving the mixed refrigerant therein is provided in the refrigerant storage container 13. It is enclosed.

The refrigerating machine oil 15 has a stable property without generating impurities by a scientific reaction with the mixed refrigerant to be used. During the refrigerating cycle, an unnecessary chemical reaction occurs with other components. If not, it is not necessary to be necessarily limited to refrigerators.

On the other hand, a first opening / closing valve 17 and a second opening / closing valve 19 are provided in the circuit of the refrigerant storage container 13, and by controlling the opening amounts of the first and second opening / closing valves 17, 19, respectively. The pressure and temperature in the refrigeration cycle are induced in the refrigerant storage container 13, and a predetermined pressure and temperature are set.

[0015] In the refrigeration apparatus configured as described above,
By switching the four-way valve 9 and allowing the refrigerant to flow as indicated by the solid line in the arrow, a refrigeration operation is performed. In addition, the heating operation can be performed by flowing as indicated by the dotted arrow, and the refrigeration operation will be specifically described here.

That is, the refrigerant gas is sucked and compressed in the compression chamber 1 and sent out at high temperature and high pressure. This high temperature / high pressure gas enters the heat source side heat exchanger 5 and is forcibly cooled by the electric fan 21. At this time, the refrigerant gas is liquefied by depriving the latent heat of condensation by the air passing through the cooling fins.

The liquefied refrigerant gas flows to the pressure reducing device 7,
Here, the high-pressure gas expands rapidly and becomes a low-temperature, low-pressure mist. Next, it flows into the use side heat exchanger 3, takes the latent heat of evaporation from the surrounding air through the fins, cools the air to cool the air, and discharges it to the outside by the blower motor 23. Here, the refrigerant gas changes from a mist state to a gas state, and flows into the compressor 1 again. The refrigerating operation is performed by repeating this cycle.

In this refrigerating operation, for example, when the operating condition is "strong", the pressure and temperature in the refrigerant storage container 13 change by adjusting the opening amounts of the first and second on-off valves 17 and 19, respectively. I do.

More specifically, for example, as shown in FIG. 4, when the temperature in the refrigerant storage container 13 is set at 40 ° C. and the pressure is set at 20 kg / cm ² , the refrigerant of R32 is about 30%
To the ratio of R134a
Is dissolved in the refrigerating machine oil 13 to a ratio of 100%. Therefore, the mixed refrigerant in the refrigeration cycle can be in an operation mode in which the refrigerant with R32 is larger than the initial charging ratio, and the refrigeration capacity is increased.

Further, when the operating condition is "weak", if the temperature is set to 40 ° C. and the pressure is set to 10 kg / cm ² , the refrigerant of R32 is about 13% and the refrigerant of R134a is 23% from FIG.
To the refrigerating machine oil 15, the operation mode in which the refrigerant having the composition ratio of R134a is large is possible. As a result, the refrigeration capacity decreases and the pressure also decreases,
Low power consumption is required.

Therefore, by changing the composition ratio of the mixed refrigerant, it is possible to perform a suitable operation corresponding to the operating conditions, and to quickly dissolve into the refrigerating machine oil 15, thereby improving control responsiveness.

Note that, as shown in FIG.
A heat transfer tube 25 is wrapped around the outer peripheral surface of 3, and one end of the heat transfer tube 25 is connected and connected to the discharge side of the compressor 1 via a temperature control valve 27. Further, the other end of the heat transfer tube 25 may be connected and connected to the intake side of the compressor 1.

According to this, the high-temperature and high-pressure refrigerant flows through the heat transfer tube 25 by opening and closing by the temperature control valve 27, and the refrigerant storage container 13 in which the refrigerating machine oil 15 is sealed is forcibly heated from the outside. As a result, quick and accurate pressure and temperature control of the refrigerant storage container 13 can be performed.

In this case, as shown in FIG. 3, the heater 31 whose temperature is controlled by the control unit 29 is directly connected to the refrigerant storage container 1.
3, the same operation and effect as the embodiment of FIG. 2 can be expected.

[0025]

As described above, according to the refrigerating apparatus of the present invention, even if it is a non-azeotropic refrigerant or an azeotropic refrigerant, it is possible to control a suitable composition ratio corresponding to an operating condition, and a wide range is obtained. Capability control can be performed and efficient operation can be performed.

Further, since a means for rapidly dissolving the refrigerant into the refrigerating machine oil is employed, a faster reaction can be performed as compared with an adsorption reaction to a solid substance and the like, so that the control response is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a refrigeration cycle embodying the present invention.

FIG. 2 is an explanatory view similar to FIG. 1, showing a second embodiment.

FIG. 3 is an explanatory view similar to FIG. 1 showing a third embodiment.

FIG. 4 is an explanatory diagram showing the solubility of each refrigerant corresponding to temperature and pressure conditions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Use side heat exchanger 5 Heat source side heat exchanger 7 Pressure reducing device 9 Four way valve 13 Refrigerant storage container 15 Refrigeration oil

────────────────────────────────────────────────── ─── front page of the continuation (72) inventor Hideaki Motohashi Yokohama, Kanagawa Prefecture Isogo-ku, Shinsugita-cho, address 8 Toshiba Corporation living space system technology research house (58) investigated the field (Int.Cl. ^7, DB name) F25B 1/00 395 F25B 1/00 385 F25B 13/00

Claims (3)

(57) [Claims] A refrigerant storage container is provided in a circuit of a refrigeration cycle including a compressor, a four-way valve, a use side heat exchanger, a heat source side heat exchanger, and a pressure reducing device. A refrigerating apparatus characterized by containing refrigerating machine oil capable of melting. 2. A refrigerant storage container in which a refrigerating machine oil capable of dissolving a mixed refrigerant is sealed in a circuit of a refrigerating cycle including a compressor, a four-way valve, a use side heat exchanger, a heat source side heat exchanger, and a pressure reducing device. A refrigerating machine using a mixed refrigerant, wherein a control means for giving a pressure or temperature change to the refrigerating machine oil in the refrigerant storage container is provided. 3. The mixing device according to claim 2, wherein the control means is an on-off valve for opening and closing a circuit on the inlet side and the outlet side of the refrigerant storage container, or a heating device for directly heating the refrigerant storage container. Refrigeration equipment using refrigerant.