Refrigerating device

Details Refrigerating device Refrigerating device

2001-03-15

2002-11-19

Tapolcai, William E. (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C236S084000, C236S09200D

Reexamination Certificate

active

06481229

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a refrigerating apparatus, in particular, a refrigerating apparatus provided with a direct drive type electrically driven expansion valve.
BACKGROUND ART
Conventionally, various refrigerating apparatuses including an air conditioner have been provided with a refrigerant circuit including a compressor, a four path switching valve, an external heat exchanger, an expansion valve, and an internal heat exchanger that are connected sequentially in this order, as disclosed in Japanese Laid-Open Patent Publication No. 8-189735. As the expansion valve, a direct drive type electrically driven expansion valve is used.
As the direct drive type electrically driven expansion valve in the refrigerating apparatus, a direct drive type electrically driven expansion valve having a predetermined rating torque corresponding to the operational ability, that is the horsepower, has been selected only empirically. Moreover, there has been no consideration about the phenomenon that sludge generated by a refrigerant that contains no chlorine is attached to the driving portion of an electrically driven expansion valve and inhibits the driving, and a necessary torque is determined without considering sludge, and an electrically driven expansion valve having that torque is simply attached.
However, this may cause a problem that the expansion valve cannot reliably be opened or closed under the condition that sludge is generated.
Furthermore, when a predetermined torque is set to be too large a value for safety on the other hand, although there is no problem on opening or closing of the electrically driven expansion valve, the expansion valve has a larger capacity than necessary, which leads to wastefulness.
In view of the above-problems, it is an object of the present invention to provide a novel method for selecting a direct drive type electrically driven expansion valve.
DISCLOSURE OF INVENTION
In the present invention, a direct drive type electrically driven expansion valve is set by using the friction factor as the parameter. In other words, the inventors of the present invention examined the conditions for driving the direct drive type electrically driven expansion valve in detail, and discovered that the friction in a thread portion is varied significantly depending on the driving conditions. Then, they made research and found that attachment of sludge is varied with the refrigerant temperature, and the friction factor is varied. Thus, the direct drive type electrically driven expansion valve is set based on the friction factor on the thread surface at the rating torque (the rating torque equivalent friction factor E in the present invention).
More specifically, a first refrigerating apparatus of the present invention includes a low pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant based on HFC is used, and a rating torque equivalent friction factor E of the direct drive type Eelectrically driven expansion valve (Z) is set to 0.31 or more and less than 0.62.
A second refrigerating apparatus of, the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant having a discharge temperature in the same level as that of R22 or higher is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.34 or more and less than 0.68.
A third refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), and a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant of R32 alone or a R32 rich mixture comprising an amount of more than 50 wt % of R32 is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.37 or more and less than 0.74.
A fourth refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a R32 rich mixture refrigerant having a discharge temperature of more than about 10° C. higher than that of R22 is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.37 or more and less than 0.74.
A fifth refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant based on HFC is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.37 or more and less than 0.74.
A sixth refrigerating apparatus of the present invention includes a low pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant based on HFC is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.62 or more and less than 0.93.
A seventh refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant having a discharge temperature in the same level as that of R22 or higher is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.68 or more and less than 1.02.
An eighth refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat exchanger (
123
) and a heat application side heat exchanger (
131
), the heat source side heat exchanger (
123
) and the heat application side heat exchanger (
131
) corresponding to each other one-to-one, wherein a refrigerant of R32 alone or a R32 rich mixture comprising an amount of more than 50 wt % of R32 is used, and a rating torque equivalent friction factor E of the direct drive type electrically driven expansion valve (Z) is set to 0.74 or more and less than 1.11.
A ninth refrigerating apparatus of the present invention includes a high pressure dome type compressor (
121
), a direct drive type electrically driven expansion valve (Z), a heat source side heat

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