1. A method for adjusting the perfusion volume of high-purity liquid carbon dioxide in a cold box is characterized by comprising the following steps: the debugging method comprises the following steps:

s1, before debugging, installing the filling pipe with the water molecular sieve and the gas-liquid separator on the regulating valve of the carbon dioxide liquid storage pipe at the bottom end of the cold box;

s2, installing an air extractor on a drain valve at one end of a carbon dioxide liquid storage pipe at the bottom end of the cold box, and evacuating liquid in the carbon dioxide liquid storage pipe in the cold box;

s3, compressing the carbon dioxide liquid into the filling pipe by the compressor, and adsorbing water molecules in the compressed carbon dioxide liquid by the water molecular sieve when the carbon dioxide liquid flows into the water molecular sieve;

s4, when the carbon dioxide liquid absorbing water molecules flows into the gas-liquid separator, the gas carried in the carbon dioxide liquid is separated and filtered by the gas-liquid separator;

s5, rectifying the filtered carbon dioxide liquid in a rectifying tower, and cooling the carbon dioxide liquid;

s6, filling a storage condenser pipe with a desired amount of cooled carbon dioxide liquid;

s7, clamping one end of the liquid discharge pipe to the valve port of the liquid inlet valve of the sealed storage metering bottle;

s8, closing the door of the refrigerator, performing power-on operation to a stable state, and recording the temperature and power of each temperature sensor during the stable operation of the refrigerator;

s9, successive discharge of a fixed amount of refrigerant: powering off a cold box which runs stably, unscrewing a liquid discharge valve, discharging a carbon dioxide liquid refrigerant into a sealed storage metering bottle through a liquid discharge pipe, recording the liquid volume of the discharged carbon dioxide liquid refrigerant, determining the quality of the discharged carbon dioxide liquid refrigerant according to the liquid volume of the discharged carbon dioxide liquid refrigerant, sequentially closing the liquid discharge valve and an adjusting valve after liquid discharge is finished, discharging the carbon dioxide liquid refrigerant again according to the steps after the cold box is powered on to run stably, repeating the steps for multiple times, and recording the temperature and the power of each temperature sensor of the corresponding refrigerator under each filling amount when the refrigerator runs stably after each discharge;

s10, statistical comparison: and (4) making a statistical table of the recorded data, comparing and determining the proper perfusion volume.

2. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: the water molecular sieve has a large surface area, typically 600 square meter/Ag-1000 square meter/Ag.

3. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: in the step S9, the refrigerator needs to be powered off for more than 10 minutes before discharging the carbon dioxide liquid refrigerant.

4. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: the sealed storage metering bottle is transparent, and the outside of the sealed storage metering bottle is provided with scale mark measuring lines.

5. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: the evacuation infusion volume is 20ml to 35ml more carbon dioxide liquid refrigerant than the intended infusion volume.

6. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: and an adsorption layer is arranged on the inner wall of the inner side of the gas-liquid separator, and the adsorbed material is a material which does not adsorb carbon.

7. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: the filling pipe is detachably connected with the carbon dioxide liquid storage pipe through a regulating valve, and a sealing leakage-proof ring box is arranged on the outer side of the joint of the filling pipe and the carbon dioxide liquid storage pipe.

8. The method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box according to claim 1, is characterized in that: and in the step of discharging the carbon dioxide liquid refrigerant successively, the discharged carbon dioxide liquid refrigerant is 5ml-10ml each time.

Background

Carbon dioxide is a colorless, tasteless and nontoxic gas at normal temperature and pressure, and the thermal conductivity of the gas at 0 ℃ is smaller than that of air under the same condition, so that the carbon dioxide gas can effectively refrigerate objects stored in the box, and meanwhile, the carbon dioxide has a certain fresh-keeping effect and can be used for food preservation.

The existing refrigerant debugging method comprises an air-adding method and an air-exhausting method, if the air-adding method is not operated properly, air is added to affect refrigeration, the air-exhausting method is generally used for exhausting air from a high-pressure end of a refrigerator, another set of Hansen valve and another set of pipeline need to be welded or connected independently when the air is exhausted from the high-pressure end, if a proper valve and a proper connecting pipe cannot be found, the Hansen valve is not easy to plug and pull due to high system pressure, and the problem of refrigerant leakage is easily caused.

Therefore, a method for adjusting the filling amount of the high-purity liquid carbon dioxide in the cold box is provided.

Disclosure of Invention

The invention aims to provide a method for adjusting the filling amount of high-purity liquid carbon dioxide in a cold box, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a method for adjusting the filling amount of high-purity liquid carbon dioxide in a cold box comprises the following steps:

s1, before debugging, installing the filling pipe with the water molecular sieve and the gas-liquid separator on the regulating valve of the carbon dioxide liquid storage pipe at the bottom end of the cold box;

s2, installing an air extractor on a drain valve at one end of a carbon dioxide liquid storage pipe at the bottom end of the cold box, and evacuating liquid in the carbon dioxide liquid storage pipe in the cold box;

s3, compressing the carbon dioxide liquid into the filling pipe by the compressor, and adsorbing water molecules in the compressed carbon dioxide liquid by the water molecular sieve when the carbon dioxide liquid flows into the water molecular sieve;

s4, when the carbon dioxide liquid absorbing water molecules flows into the gas-liquid separator, the gas carried in the carbon dioxide liquid is separated and filtered by the gas-liquid separator;

s5, rectifying the filtered carbon dioxide liquid in a rectifying tower, and cooling the carbon dioxide liquid;

s6, filling a storage condenser pipe with a desired amount of cooled carbon dioxide liquid;

s7, clamping one end of the liquid discharge pipe to the valve port of the liquid inlet valve of the sealed storage metering bottle;

s8, closing the door of the refrigerator, performing power-on operation to a stable state, and recording the temperature and power of each temperature sensor during the stable operation of the refrigerator;

s9, successive discharge of a fixed amount of refrigerant: powering off a cold box which runs stably, unscrewing a liquid discharge valve, discharging a carbon dioxide liquid refrigerant into a sealed storage metering bottle through a liquid discharge pipe, recording the liquid volume of the discharged carbon dioxide liquid refrigerant, determining the quality of the discharged carbon dioxide liquid refrigerant according to the liquid volume of the discharged carbon dioxide liquid refrigerant, sequentially closing the liquid discharge valve and an adjusting valve after liquid discharge is finished, discharging the carbon dioxide liquid refrigerant again according to the steps after the cold box is powered on to run stably, repeating the steps for multiple times, and recording the temperature and the power of each temperature sensor of the corresponding refrigerator under each filling amount when the refrigerator runs stably after each discharge;

s10, statistical comparison: and (4) making a statistical table of the recorded data, comparing and determining the proper perfusion volume.

Preferably, the water molecule sieve has a large surface area, typically 600 square meter/Ag-1000 square meter/Ag.

Preferably, the refrigerator in the S9 step needs to be powered off for more than 10 minutes before discharging the carbon dioxide liquid refrigerant.

Preferably, the sealed storage metering bottle is transparent, and the outside of the sealed storage metering bottle is provided with scale measuring lines.

Preferably, the evacuation fill volume is 20ml to 35ml more carbon dioxide liquid refrigerant than the expected fill volume.

Preferably, an adsorption layer is arranged on the inner wall of the inner side of the gas-liquid separator, and the adsorbed material is a material which does not adsorb carbon.

Preferably, the filling pipe is detachably connected with the carbon dioxide liquid storage pipe through a regulating valve, and a sealing leakage-proof ring box is arranged on the outer side of the joint of the filling pipe and the carbon dioxide liquid storage pipe.

Preferably, the carbon dioxide liquid refrigerant discharged in the carbon dioxide liquid refrigerant successive discharging step is 5ml to 10ml per time.

Compared with the prior art, the invention has the beneficial effects that: the device is beneficial to reducing the influence on the refrigeration effect caused by the fact that external gas enters the condensation pipe in the filling process, is beneficial to reducing water molecules in the carbon dioxide liquid refrigerant, is beneficial to improving the accuracy of the debugging effect, and is beneficial to reducing errors generated by debugging.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: a method for debugging the perfusion volume of high-purity liquid carbon dioxide in a cold box comprises the following steps:

s1, before debugging, installing the filling pipe with the water molecular sieve and the gas-liquid separator on the regulating valve of the carbon dioxide liquid storage pipe at the bottom end of the cold box;

s2, installing an air extractor on a drain valve at one end of a carbon dioxide liquid storage pipe at the bottom end of the cold box, and evacuating liquid in the carbon dioxide liquid storage pipe in the cold box;

s3, compressing the carbon dioxide liquid into the filling pipe by the compressor, and adsorbing water molecules in the compressed carbon dioxide liquid by the water molecular sieve when the carbon dioxide liquid flows into the water molecular sieve;

s4, when the carbon dioxide liquid absorbing water molecules flows into the gas-liquid separator, the gas carried in the carbon dioxide liquid is separated and filtered by the gas-liquid separator;

s5, rectifying the filtered carbon dioxide liquid in a rectifying tower, and cooling the carbon dioxide liquid;

s6, filling a storage condenser pipe with a desired amount of cooled carbon dioxide liquid;

s7, clamping one end of the liquid discharge pipe to the valve port of the liquid inlet valve of the sealed storage metering bottle;

s8, closing the door of the refrigerator, performing power-on operation to a stable state, and recording the temperature and power of each temperature sensor during the stable operation of the refrigerator;

s9, successive discharge of a fixed amount of refrigerant: powering off a cold box which runs stably, unscrewing a liquid discharge valve, discharging a carbon dioxide liquid refrigerant into a sealed storage metering bottle through a liquid discharge pipe, recording the liquid volume of the discharged carbon dioxide liquid refrigerant, determining the quality of the discharged carbon dioxide liquid refrigerant according to the liquid volume of the discharged carbon dioxide liquid refrigerant, sequentially closing the liquid discharge valve and an adjusting valve after liquid discharge is finished, discharging the carbon dioxide liquid refrigerant again according to the steps after the cold box is powered on to run stably, repeating the steps for multiple times, and recording the temperature and the power of each temperature sensor of the corresponding refrigerator under each filling amount when the refrigerator runs stably after each discharge;

s10, statistical comparison: making a statistical table of the recorded data, comparing the data and determining the proper perfusion amount

In this embodiment, be favorable to reducing in the in-process outside gas that fills gets into the condenser pipe, influence cryogenic effect, be favorable to reducing the hydrone in the carbon dioxide liquid refrigerant that gets into, be favorable to improving the accuracy of debugging effect, be favorable to reducing the error that the debugging produced.

In particular, a water molecular sieve has a very large surface area, typically 600 square meter/Ag-1000 square meter/Ag.

In this embodiment, be convenient for carry out drying and water molecule adsorption filtration to carbon dioxide liquid refrigerant, be favorable to preventing that the water molecule from influencing the effect of debugging.

Specifically, in the step S9, the refrigerator needs to discharge the carbon dioxide liquid refrigerant after the power failure exceeds 10 minutes, the sealed storage metering bottle is transparent, the outside of the sealed storage metering bottle is provided with a scale measuring line, and the filling amount is evacuated to 20ml-35ml more carbon dioxide liquid refrigerant than the expected filling amount.

In this embodiment, be convenient for measure the reading data to the carbon dioxide liquid refrigerant who discharges, during the measurement, it is comparatively convenient.

Specifically, an adsorption layer is arranged on the inner wall of the inner side of the gas-liquid separator, the adsorbed material is a material which does not absorb carbon, the filling pipe is detachably connected with the carbon dioxide liquid storage pipe through an adjusting valve, a sealed leakage-proof ring box is arranged on the outer side of the joint of the filling pipe and the carbon dioxide liquid storage pipe, and the carbon dioxide liquid refrigerant is discharged by 5ml-10ml each time in the step of gradually discharging the carbon dioxide liquid refrigerant.

In this embodiment, be convenient for install and dismantle auxiliary part vapour and liquid separator, fill pipe and fluid-discharge tube, be favorable to improving the accuracy of debugging.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.