CN201599990U - CO2 adjusting bucket for R404A/CO2 cascade low-temperature refrigeration cycle system - Google Patents

Abstract

A CO2 adjusting bucket for an R404A/CO2 cascade low-temperature refrigeration cycle system is mainly formed by a CO2 bucket body and a condensation rack pipe arranged inside the CO2 bucket body. The CO2 bucket body is a closed container with a certain volume; when temperature and pressure rise, the CO2 adjusting bucket can be used as an expansion container to limit CO2 pressure within a specified pressure range; and when CO2 exceeds critical temperature, the CO2 bucket can carry out cooling and condensation on the CO2 via the condensation rack pipe arranged inside CO2 bucket body. The condensation rack pipe inside the CO2 bucket body is of a coil-pipe shape so as to increase contact area of the condensation rack pipe and the CO2. The CO2 bucket is capable of automatically adjusting the CO2 pressure to limit the same within the specified pressure range, and when the CO2 exceeds the critical temperature, the CO2 adjusting barrel can cool down and condensate the CO2 to separate liquid drops contained in gasification from an evaporator, thereby avoiding liquid impact of a compressor.

Description

Be used for R404A/CO 2The CO of overlapping low-temperature cooling cycle system 2Regulate bucket

Technical field

The utility model belongs to refrigeration technology field, particularly relates to a kind of R404A/CO of being used for ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket.

Background technology

Refrigeration Technique is very obvious to the influence of modern society, has developed into an indispensable important ring in people's life, and its application is increasingly extensive, omnipresent.Tradition all adopts a kind of cold-producing medium in the refrigerating method, when cryogenic temperature requires the difficulty that some are difficult to overcome can occur when low: at first, any evaporant no matter, evaporating temperature is low more, and evaporating pressure is also just low more.And that low excessively evaporating pressure may cause compressor to be difficult to sometimes is air-breathing, perhaps makes extraneous air enter refrigeration system.Secondly, cross when low in temperature, some cold-producing medium commonly used has reached setting temperature, can't realize the flow circuit of cold-producing medium.Once more, along with evaporating pressure reduces, the unit mass refrigerant volume increases, and refrigerant mass fluxes reduces, and refrigerating capacity reduces greatly.For obtaining required refrigerating capacity, must increase air-breathing area, like this then volume compressor is too huge.Therefore, existing refrigeration system is difficult to provide low storage temperature.

Industrial quarters still adopts the two-stage multiplex refrigerating circulation to realize cryogenic refrigeration comparatively at large now.The cascade refrigeration system generally is made up of two single stage compress kind of refrigeration cycle, and basic principle is to utilize low temperature level system of a high temperature level refrigeration system cooling, and to realize lower cryogenic temperature, wherein every grade all is complete steam compression cycle; Usually adopt R22 and R13 to make cold-producing medium, but R22 and R13 not only destroy atmospheric ozone layer, and can produce serious greenhouse effects.Therefore need to adopt new cold-producing medium to satisfy the needs of cascade refrigeration system.

CO ₂As refrigeration working medium a lot of advantages are arranged, it has, and pipeline size is less, the pump energy consumption is low, heat exchange efficiency is high and do not have characteristics such as etching problem.CO ₂Compare with other cold-producing medium, even CO when cryogenic temperature is low ₂Viscosity also very little, heat transfer property is good because utilize latent heat, its refrigerating capacity is quite big.Therefore the patent that the patent No. is 200420056008.1, name is called natural refrigerant cascade refrigeration device has proposed NH ₃/ CO ₂The scheme of cascade refrigeration circulation, hiigh pressure stage NH ₃, low-pressure stage CO ₂Make cold-producing medium; But NH ₃Have very strong toxicity,, can pollute environment and food in case leak.Simultaneously, because CO ₂Critical-temperature low (31.1 ℃), critical pressure height (7.4MPA), CO ₂Pressure is also very high at normal temperatures, not even in the pressure limit of safety; Contain drop from the gasification that evaporimeter comes, these drops are as being caused the compressor liquid hammer by the compressor suction.

Owing to there is above-mentioned defective, thus above-mentioned patent and fail development and utilization.

The utility model content

Through long-term arduous research and experiment, the utility model has overcome the deficiencies in the prior art, and purpose is: propose a kind of R404A/CO that is used for ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, when the temperature rising, when pressure raises, CO ₂Regulate bucket and can be used as expansion vessel, make CO ₂Pressure limit the regulation pressure limit in.

The further purpose of the utility model is: work as CO ₂During supercritical temperature, CO ₂Regulating bucket can be to CO ₂The cooling condensation.

The utility model further purpose also is: owing to contain drop from the gasification that evaporimeter comes, as being caused the compressor liquid hammer by the compressor suction, pass through CO ₂Regulate bucket, separablely go out drop, make compressor exempt from destruction.

To achieve these goals, the utility model has adopted following technical scheme: be used for R404A/CO ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, mainly by a CO ₂Staving and be arranged on CO ₂Condensation comb in the staving is formed.

Described CO ₂Staving is the closed container with a constant volume, when the temperature rising, when pressure raises, and CO ₂Regulate bucket and can be used as expansion vessel, make CO ₂Pressure limit the regulation pressure limit in.

Described CO ₂The shape of staving can be the solid geometry body of different shapes such as spheroid, spheroid.

Work as CO ₂During supercritical temperature, can be by being arranged on CO ₂Condensation comb in the staving is to CO ₂The cooling condensation.In order to increase condensation comb and CO ₂Contact area, the described CO that is arranged on ₂Condensation comb in the staving is preferably the coiled pipe shape.

The condensation comb of described coiled pipe shape can be transversely arranged, also can vertical array.

In order to ensure safety, at above-mentioned CO ₂On the staving, can be provided with the safety dumping valve.

In order to observe CO ₂The liquid level of staving is at above-mentioned CO ₂On the staving, can be provided with the liquid level visor.

Because CO ₂Staving is one to have the closed container of a constant volume, and the separable drop that goes out to contain from the gasification that evaporimeter comes is avoided the generation of compressor liquid hit phenomenon.In order to clear up CO easily ₂The dirt that staving drop etc. contains can be provided with blow-off pipe on above-mentioned.

The beneficial effects of the utility model are: the CO with a constant volume ₂Staving is regulated CO automatically ₂Pressure, make in its pressure limit that is limited in regulation; Work as CO ₂During supercritical temperature, CO ₂Regulating bucket can be to CO ₂Cooling condensation and the separable drop that goes out to contain from the gasification that evaporimeter comes are avoided the generation of compressor liquid hit phenomenon, have realized the purpose of this utility model.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the structure chart of the utility model embodiment.

Fig. 2 is the structure chart of another embodiment of the utility model.

Among the figure: 10-CO ₂Staving, 11-safety dumping valve, 12-liquid level visor, 13-blow-off pipe; 20-condensation comb.

The specific embodiment

Embodiment 1: referring to accompanying drawing 1, be used for R404A/CO ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, mainly by a CO ₂Staving 10 and be arranged on CO ₂Condensation comb 20 in the staving 10 is formed.

Described CO ₂The closed container of staving 10 for having a constant volume, when the temperature rising, when pressure raises, CO ₂Regulate bucket and can be used as expansion vessel, make CO ₂Pressure limit the regulation pressure limit in.

Described CO ₂The shape of staving 10 is solid geometry bodies of spheroid or spheroid shape.

Work as CO ₂During supercritical temperature, can be by being arranged on CO ₂20 couples of CO of condensation comb in the staving 10 ₂The cooling condensation.In order to increase condensation comb 20 and CO ₂Contact area, the described CO that is arranged on ₂ Condensation comb 20 in the staving 10 is the coiled pipe shape.

The condensation comb 20 of described coiled pipe shape is transversely arranged coiled pipe.

In order to ensure safety, at above-mentioned CO ₂On the staving 10, be provided with safety dumping valve 11.

In order to observe CO ₂The liquid level of staving is at above-mentioned CO ₂On the staving 10, be provided with liquid level visor 12.

Because CO ₂Staving 10 is one to have the closed container of a constant volume, and the separable drop that goes out to contain from the gasification that evaporimeter comes is avoided the generation of compressor liquid hit phenomenon.In order to clear up CO easily ₂The dirt that staving 10 drops etc. contain is at above-mentioned CO ₂Staving 10 is provided with blow-off pipe 13.

Embodiment 2: referring to accompanying drawing 2, the condensation comb 20 of described coiled pipe shape is vertically disposed coiled pipe.

Claims (5)

1. be used for R404A/CO ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, mainly by a CO ₂Staving and be arranged on CO ₂Condensation comb in the staving is formed, and it is characterized in that: described CO ₂Staving is the closed container with a constant volume, the described CO that is arranged on ₂Condensation comb in the staving is the coiled pipe shape.

2. the R404A/CO that is used for according to claim 1 ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, it is characterized in that: described CO ₂The shape of staving is the solid geometry body of spheroid or spheroid shape.

3. the R404A/CO that is used for according to claim 1 and 2 ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, it is characterized in that: described CO ₂The safety dumping valve is arranged on the staving.

4. according to claim 1, the 2 described R404A/CO that are used for ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, it is characterized in that: at CO ₂On the staving, be provided with the liquid level visor.

5. according to claim 1, the 2 described R404A/CO that are used for ₂The CO of overlapping low-temperature cooling cycle system ₂Regulate bucket, it is characterized in that: at CO ₂Staving is provided with blow-off pipe.

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