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Cascade refrigeration equipment

A binary refrigeration and control device technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as insufficient cooling, and achieve the effect of improving reliability

Active Publication Date: 2015-04-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that, for example, if the refrigerant is condensed to some extent, the inside of the low-stage side condenser of the low-stage refrigeration cycle in the cascade condenser is filled with liquid refrigerant, and sufficient cooling cannot be performed.

Method used

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  • Cascade refrigeration equipment
  • Cascade refrigeration equipment
  • Cascade refrigeration equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a figure which shows the structure of the binary refrigeration apparatus of Embodiment 1 of this invention. in figure 1 Among them, the binary refrigeration apparatus of the present embodiment includes a low-element refrigeration cycle 10 and a high-element refrigeration cycle 20 as refrigeration cycle devices that perform heat pumps by the circulation of the enclosed refrigerant. The low-grade refrigeration cycle 10 and the high-grade refrigeration cycle 20 can each independently circulate refrigerant. Here, for the performance of high and low including temperature, pressure, etc., the high and low are not specifically determined based on the relationship with the absolute value, but are relative in the state and action of the system, device, etc. To be sure.

[0025] In the refrigerant enclosed in the low-grade refrigeration cycle 10 (hereinafter referred to as low-temperature side refrigerant), carbon dioxide (CO 2 ). In addition, as the refrigerant enc...

Embodiment approach 2

[0094] In the first embodiment described above, in both the normal cooling operation and the pressure increase suppression operation of the low-stage refrigerant circuit, the high-stage refrigerant is caused to flow into the accumulator heat exchange part 25. Next, an embodiment in which the high-phase refrigerant flows into the accumulator heat exchange part 25 when the pressure increase suppression operation of the low-component refrigerant circuit is performed. Here, for example, the equipment described in the first embodiment performs the same operations as those described in the first embodiment.

[0095] Figure 4 It is a figure which shows the structure of the binary refrigeration apparatus of Embodiment 2 of this invention. In the binary refrigeration device of the present embodiment, the high-element refrigeration cycle 20 includes a receiver heat exchange circuit 40. The accumulator heat exchange circuit 40 has a heat exchange part inlet valve 27, a heat exchange part ...

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Abstract

This cascade refrigeration equipment is provided with: a high-temperature refrigeration circuit (20) constituting a high-temperature-side refrigerant circuit wherein pipes connect a high-temperature-side compressor (21), a high-temperature-side condenser (22), a high-temperature-side expansion valve (23) and a high-temperature-side evaporator (24); a low-temperature refrigeration circuit (10) constituting a low-temperature-side refrigerant circuit wherein pipes connect a low-temperature-side compressor (11), a low-temperature-side condenser (12), a low-temperature-side liquid receiver (13), a low-temperature-side expansion valve (14) and a low-temperature-side evaporator (15); a cascade condenser (30) containing the high-temperature-side evaporator (24) and the low-temperature-side condenser (12); a liquid receiver heat exchanging unit (25) that cools the low-temperature-side liquid receiver (13); and a high-temperature refrigeration circuit controller (32) that activates the high-temperature-side compressor (21) when it is estimated, on the basis of the pressure of a low-temperature-side refrigerant, that the low-temperature-side refrigerant is in a supercritical state while the low-temperature-side compressor (11) is stopped.

Description

Technical field [0001] The present invention relates to a binary refrigeration device, and more particularly, to a binary refrigeration device provided with a cooling section that cools an accumulator while a compressor in a low-stage refrigeration cycle device is stopped. Background technique [0002] Conventionally, as a device for cooling a low temperature zone of several tens of degrees below zero, a binary refrigeration device has been used which has a high-element refrigeration cycle as a refrigeration cycle device for circulating a high-temperature side refrigerant, and as A low-element refrigeration cycle of a refrigeration cycle device for circulating a low-temperature side refrigerant. For example, in a binary refrigeration device, a cascade condenser is used to connect the low-element refrigeration cycle and the high-element refrigeration cycle, and is made into a multi-stage structure. The cascade condenser condenses the low-element side of the low-element refrigerati...

Claims

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Application Information

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IPC IPC(8): F25B7/00F25B1/00
CPCF25B9/008F25B2700/2106F25B5/04F25B2400/0409F25B7/00F25B49/02F25B2309/061F25B2700/2104F25B2700/1931F25B2400/16F25B2700/2108F25B1/00F25B49/022
Inventor 高山启辅石川智隆杉本猛山下哲也池田隆
Owner MITSUBISHI ELECTRIC CORP