CN203385233U

CN203385233U - Carbon dioxide refrigeration cycle system

Info

Publication number: CN203385233U
Application number: CN201320398842.8U
Authority: CN
Inventors: 李林; 张超; 刘洪文; 张海清
Original assignee: YANTAI MOON CO Ltd
Current assignee: YANTAI MOON CO Ltd
Priority date: 2013-07-05
Filing date: 2013-07-05
Publication date: 2014-01-08
Anticipated expiration: 2023-07-05

Abstract

The utility model discloses a carbon dioxide refrigeration cycle system, which uses a high temperature refrigeration cycle system and a carbon dioxide (CO2) low temperature refrigeration cycle system to form a CO2 cascade refrigeration system, wherein the CO2 low temperature refrigeration cycle system comprises a CO2 refrigeration compressor (1), a liquid phase CO2 receiver (6) and a CO2 refrigeration cycle throttling device (8), a CO2 by-pass valve (11) is connected between an inlet and an outlet of the CO2 refrigeration compressor (1), a CO2 liquid pump (10) is connected between the liquid phase CO2 receiver (6) and the CO2 refrigeration cycle throttling device (8), and a CO2 liquid pump by-pass valve (7) is connected between an inlet and an outlet of the CO2 liquid pump (10). The CO2 refrigeration compressor is closed when the refrigeration temperature is higher than a critical refrigeration temperature for saving energy, and the carbon dioxide refrigeration cycle system reduces energy consumption through cold carrying cycle.

Description

A kind of carbon dioxide refrigeration circulatory system

Technical field

The utility model relates to a kind of refrigeration system, relates more specifically to a kind of carbon dioxide refrigeration circulatory system.

Background technology

In recent years, owing to finding that freon class cold-producing medium has destruction to atmospheric ozone layer and can produce the environmental problem such as greenhouse effects, having reached in the world to forbid the CFC class fully, the common recognition of HCFC class cold-producing medium is used in restriction gradually.For this reason, the researcher in the whole world is active research freon substitute technology also, wherein take and study artificial synthetic class refrigeration working medium as main, but a large amount of facts show, many artificial synthetic materials, although see from the beginning to the mankind it is useful, along with a large amount of and long-term use of this material, just progressively show the considerable damage effect to ecological environment.Along with the application and development of world's refrigeration and air-conditioning technical, the demand of refrigeration working medium is risen year by year, reach the consumption of few hundred thousand tonnes of every year.The overwhelming majority of the artificial synthetic class refrigeration working medium used will be diffused in atmosphere goes, some materials retain centuries in atmosphere, can produce other side effect or decomposite harmful substance after some substance decomposition, all the time the ecological environment of the earth be existed to potential danger.

CO ₂be the naturally occurring material of nature, its depletion of the ozone layer potential (ODP) is zero, its greenhouse effects potential minimum (GWP=1), CO ₂be the highest oxidation state of carbon, have highly stable chemical property, density is little, both non-combustible, also not combustion-supporting, is environmentally friendly refrigerating medium, wide material sources.Under normal temperature, CO ₂be a kind of colourless, tasteless, nontoxic gas, little in different condition, can present gas, liquid, three kinds of existence forms of solid, CO ₂critical pressure be 7.37Mpa, critical-temperature is 31.1 ℃, three phase point pressure is 518kPa, three phase point temperature-56.56 ℃, when 101.325 kPa, its sublimation temperature is-78.15 ℃, in the time of 0 ℃, CO ₂the pressure of saturated liquid is 3.48MPa.So, if transmit the cold of-50 ℃ to 0 ℃, the pressure of refrigerating pipeline must guarantee that pressure range is that 0.52MPa is to 3.48MPa.

CO ₂folding type cooling system than CO ₂single-stage refrigerating system is more energy-conservation, but, some critical-temperatures interval (being generally-35 ℃～-20 ℃), works as CO ₂folding type cooling system at cryogenic temperature higher than this refrigeration during critical-temperature, due to CO ₂increased carbon-dioxide gas compressor in folding type cooling system, thereby increased wasted work, reduced the COP of system, if now adopt CO ₂the refrigerating system, energy-saving effect can be more obvious.

The utility model content

The utility model is in order to overcome the weak point of existing refrigeration system, a kind of carbon dioxide refrigeration circulatory system to be provided, and at cryogenic temperature, during higher than energy-conservation critical cryogenic temperature, closes CO ₂refrigeration compressor, pass through CO ₂refrigerating circulate to reduce system energy consumption.

The utility model is achieved through the following technical solutions:

A kind of carbon dioxide refrigeration circulatory system, by the high-temperature refrigeration circulatory system and CO ₂low-temperature refrigeration circulating device forms

CO ₂folding type cooling system, wherein CO ₂low-temperature refrigeration circulating device comprises CO ₂refrigeration compressor (1), liquid phase CO ₂liquid reservoir (6) and CO ₂kind of refrigeration cycle throttling arrangement (8), is characterized in that, at CO ₂be connected with CO between the import of refrigeration compressor (1) and outlet ₂by-passing valve (11); At liquid phase CO ₂liquid reservoir (6) and CO ₂the kind of refrigeration cycle throttling arrangement is connected with CO between (8) ₂liquid pump (10), and at CO ₂be connected with CO2 liquid pump by-passing valve (7) between the import of liquid pump (10) and outlet.

The utlity model has following good effect:

The utility model is at CO ₂liquid pump and CO ₂the two ends of refrigeration compressor are connected with respectively by-passing valve, by controlling two by-passing valves and CO ₂the opening and closing of refrigeration compressor, make refrigeration system during higher than energy-conservation critical cryogenic temperature, close CO at cryogenic temperature ₂refrigeration compressor, reduce CO ₂the energy consumption of refrigeration system.Like this, CO of the present utility model ₂the energy consumption of refrigeration system under any cryogenic temperature is all smaller, has reached the purpose of saving the energy.

The accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

The specific embodiment

Further illustrate the utility model below in conjunction with the drawings and specific embodiments.

As Fig. 1, the utility model comprises evaporative condenser 2, the outlet side of evaporative condenser 2 connects the suction end of high-temperature refrigeration compressor 3, the exhaust end of high-temperature refrigeration compressor 3 connects the inlet end of high-temperature refrigeration cycle condenser 4, and the outlet end of high-temperature refrigeration cycle condenser 4 connects the liquid feeding end of evaporative condenser 2 by high-temperature refrigeration circulation throttling arrangement 5.

The utility model also comprises CO ₂kind of refrigeration cycle evaporimeter 9, CO ₂the outlet side of kind of refrigeration cycle evaporimeter 9 connects CO ₂the suction end of refrigeration compressor 1, CO ₂the exhaust end of refrigeration compressor 1 connects the refrigerating medium import of evaporative condenser 2, and the refrigerating medium outlet of evaporative condenser 2 connects liquid phase CO ₂the liquid feeding end of liquid reservoir 6, liquid phase CO ₂the drain side of liquid reservoir 6 is passed through CO successively ₂ liquid pump 10 and CO ₂kind of refrigeration cycle throttling arrangement 8 connects CO ₂the liquid feeding end of kind of refrigeration cycle evaporimeter 9.

At CO ₂be connected with CO between the import of liquid pump 10 and outlet ₂liquid pump by-passing valve 7, at CO ₂be connected with CO between the suction end import of refrigeration compressor 1 and exhaust end outlet ₂by-passing valve 11.

Claims

1. the carbon dioxide refrigeration circulatory system, by the high-temperature refrigeration circulatory system and CO ₂low-temperature refrigeration circulating device forms CO ₂folding type cooling system, wherein CO ₂low-temperature refrigeration circulating device comprises CO ₂refrigeration compressor (1), liquid phase CO ₂liquid reservoir (6) and CO ₂kind of refrigeration cycle throttling arrangement (8), is characterized in that, at CO ₂be connected with CO between the import of refrigeration compressor (1) and outlet ₂by-passing valve (11); At liquid phase CO ₂liquid reservoir (6) and CO ₂the kind of refrigeration cycle throttling arrangement is connected with CO between (8) ₂liquid pump (10), and at CO ₂be connected with CO2 liquid pump by-passing valve (7) between the import of liquid pump (10) and outlet.