JP4972573B2 - Freon regenerator - Google Patents

Description

  The present invention relates to a flon regenerator for removing impurities such as oil contained in recovered flon.

  Since chlorofluorocarbons released into the atmosphere cause destruction of the ozone layer and global warming, the used chlorofluorocarbons are collected and decomposed, or the collected chlorofluorocarbons are treated to remove impurities such as refrigerating machine oil and moisture. Reuse after being done.

  Patent Document 1 discloses a hot water bath apparatus that heats a recovered chlorofluorocarbon cylinder filled with recovered chlorofluorocarbon, an oil separator that separates oil contained in gasified chlorofluorocarbon, a compressor that compresses chlorofluorocarbon from which oil has been separated, and a compression A chiller that cools and liquefies the recovered chlorofluorocarbon, a regenerative chlorofluorocarbon cylinder filled with the liquefied chlorofluorocarbon, and a filter dryer that removes moisture contained in the chlorofluorocarbon is disposed in the process, and the recovered chlorofluorocarbon is purified to regenerated chlorofluorocarbon A playback device is disclosed.

  By the way, chlorofluorocarbon has a low boiling point and vaporizes before the oil and moisture that are impurities contained in the recovered chlorofluorocarbon, so most of the oil and moisture can be removed just by vaporization, but it is contained in the vaporized chlorofluorocarbon. A small amount of oil mist and moisture cannot be removed.

  In a simple regenerator such as the above-mentioned flon regenerator, the oil content contained in the freon is removed by an oil separator and the water is removed by a filter dryer, but the oil and water are not sufficiently removed by a single treatment. The same process is performed twice, which has the disadvantage that the reproduction time becomes longer. Further, the regenerator has become larger due to an oil separator, a cooler, a filter dryer, etc., and a large installation space has been required.

In view of such a current situation, the present applicant has developed and proposed a new type of CFC regenerating apparatus that uses the electric dust collector shown in Patent Document 2. The fluorocarbon regenerator is configured to charge impurities by friction by passing gasified recovered fluorocarbon containing impurities such as oil (oil mist) through a helically wound tetrafluoroethylene resin tube. The structure is such that the charged impurities are removed by adhering to the dust collecting electrode of the electric dust collector to regenerate chlorofluorocarbon. After that, according to the research of the present inventor, if the charge amount of the impurities in the chlorofluorocarbon increases, the impurity removal processing becomes easier, and a voltage of about 2 kv is applied to the dust collecting electrode. It has been found that safety can be improved if can be used. Then, it came to propose the new apparatus which took in these points and improved.
JP 2001-26559 A JP 2007-144319 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorocarbon regenerator having a high removal rate of impurities in fluorocarbon, which is smaller and has improved safety.

  In order to achieve the above object, according to the first aspect of the present invention, a needle valve is interposed in the first pipe connecting the gas outlet of the recovery CFC cylinder and the gas inlet of the electric dust collector. Gas discharged from the recovery CFC cylinder provided by connecting the gas discharge port of the electric dust collector and the inlet of the condenser, and connecting the outlet of the condenser and the liquid inlet / outlet of the regeneration CFC cylinder The recovered chlorofluorocarbon is passed through a narrow passage in the needle valve to charge impurities contained in the chlorofluorocarbon. The charged impurities are removed by the electric dust collector, and the condenser is used to remove the gas from the gas state. It is characterized in that it is provided so that the liquefied chlorofluorocarbon again is accommodated in the recycled chlorofluorocarbon cylinder.

  In order to achieve the same object, the invention described in claim 2 is characterized in that in the chlorofluorocarbon regenerating apparatus according to claim 1, a heater device is provided in a cylinder body of the recovery chlorofluorocarbon cylinder. is there.

  In order to achieve the same object, the invention described in claim 3 is the second pipe connecting the electric dust collector and the condenser in the flon regenerator according to claim 1 or 2. In addition, a compressor is interposed.

  In order to achieve the same object, the invention described in claim 4 is the third aspect of the present invention, in which the condenser and the regenerative CFC cylinder are connected in the CFC regeneration apparatus according to any one of claims 1 to 3. The pipe is provided with a filter for removing moisture contained in the chlorofluorocarbon.

(Invention of Claim 1)
This flon regenerator makes a large amount of charge to the impurities by allowing impurities such as oil (oil mist) contained in the gasified recovered flon to collide with the needle of the needle valve and passing through the narrow passage of the valve. It is possible to efficiently remove impurities in a short time by using an electric dust collector. In addition, this device uses an electric dust collector because the electrification amount is about 30 times higher due to the use of a needle valve compared to a fluorocarbon regenerator using a conventional coil-shaped tetrafluoroethylene resin tube. The voltage is reduced to about half of the conventional voltage, and the power source is small and inexpensive. Overall, the entire apparatus is miniaturized and the safety is improved.

(Invention of Claim 2)
This CFC regeneration device is equipped with a heater device that warms the cylinder body of the recovery CFC cylinder, so that the cylinder body can be prevented from being cooled by the heat of vaporization of the liquid recovery CFC, and the CFC vaporization action can be prevented. It is possible to avoid the decrease. In addition, there is a secondary effect that the charge amount of the impurity is increased by appropriately maintaining the temperature of the cylinder body with the heater device.

(Invention of Claim 3)
In this chlorofluorocarbon regenerating device, chlorofluorocarbon is compressed by the compressor interposed in the second pipe connecting the electric dust collector and the condenser, so that liquefaction by the condenser in the subsequent process can be promoted. .

(Invention of Claim 4)
This CFC regeneration device can remove moisture contained in CFC by a filter interposed in the second pipe connecting the electric dust collector and the condenser.

  The best mode of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a CFC regeneration device according to the present invention, FIG. 2 is an explanatory diagram of an electric dust collector, and FIG. 3 is a schematic diagram showing a schematic configuration of a needle valve.

  The fluorocarbon regenerator R according to the present invention includes a needle valve 30 having a function of charging impurities such as oil (oil mist) contained in gasified recovered fluorocarbon by frictional action, and an electric collector that removes the charged impurities. The dust device 20 and the condenser 50 that liquefies CFCs are the main components.

  In FIG. 1, with respect to the recovered chlorofluorocarbon cylinder 1, a gas open / close valve 3 and a liquid open / close valve 4 are provided on the upper part of the cylinder main body 2 in which the liquefied chlorofluorocarbon to be regenerated is stored, A known heater device 5 incorporating a heater (not shown) is mounted so as to wind. The heater device 5 is provided in order to prevent the gasification from being delayed when the cylinder body 2 is cooled by the heat of vaporization of the recovered chlorofluorocarbon and the temperature is lowered.

  As for the regenerative fluorocarbon cylinder 8, a gas on-off valve 10 and a liquid on-off valve 11 are provided on an upper portion of a cylinder main body 9 that accommodates the liquefied fluorocarbon that has been subjected to the regeneration process.

  As shown in FIG. 2, the electric dust collector 20 is provided with a processing chamber 20a hermetically sealed by attaching a bottom lid 22 and an upper lid 25 to a cylindrical body portion 21 and made of stainless steel in the processing chamber 20a. A structure in which dust collecting electrodes 27 in which flat plates are arranged in parallel at predetermined intervals are arranged, and a positive electrode and a negative electrode of a DC power supply 28 are alternately connected to these flat plates to apply a voltage of about 1 kv between the electrodes. It is said that. Reference numeral 23 denotes a gas inlet provided in the bottom lid 22, 24 denotes a plug screwed into the drain port 22 a of the bottom lid 22, and 26 denotes a gas outlet provided in the upper lid 25.

  A needle valve 30 is interposed in the first pipe line 15 that connects the gas outlet 3 a of the gas opening / closing valve 3 of the recovery CFC cylinder 1 and the gas inlet 23 of the electric dust collector 20. In this embodiment, the needle valve 30 is directly attached to the gas inlet 23.

  As shown in FIG. 3, the needle valve 30 is provided in a metal valve main body 31 so that an inlet hole 32 and an outlet hole 33 communicate with each other at right angles, and a back portion 32 a that communicates with the outlet hole 33 of the inlet hole 32. Is formed in a small diameter, and a needle 34 screwed into one end side of the outlet hole 33 is provided so as to be fixed by a nut 36. The distal end portion 34a of the needle 34 is provided so as to advance and retreat at a position facing the inner portion 32a of the inlet hole 32. By rotating the head portion 34b of the needle 34, the size of the passage, in other words, the gap 37 is provided. Is provided to be adjustable.

  Reference numeral 41 denotes a second pipe connecting the gas outlet 26 of the electric dust collector 20 and the inlet 50a of the condenser 50. A compressor 45 is interposed in the second pipeline 41. Reference numeral 51 denotes a cooling fan for the condenser 50.

A third pipe 55 connects the outlet 50b of the condenser 50 and the liquid inlet / outlet port 11a of the liquid opening / closing valve 11 of the regeneration flon cylinder 8. The third pipe 55 is provided with a filter 56 for removing moisture contained in the chlorofluorocarbon.

  About the water | moisture content contained in the collection | recovery Freon, if it is in the state of the particle | grains of ice, it will be charged by friction when passing the needle valve 30, Therefore It can be removed with the electric dust collector 20. FIG. Therefore, although the filter 56 is not necessarily required, if the filter 56 having a built-in adsorbent such as molecular sieve is provided, the moisture removal rate can be further increased.

  As described above, by passing the gasified recovery CFC discharged from the recovery CFC cylinder 1 through a narrow passage (gap 37) in the needle valve 30, the impurities contained in the CFC are charged, and the charged impurities are removed. The CFC regeneration apparatus R according to the present invention is configured in which the CFCs removed by the electric dust collector 20 and liquefied from the gas state by the condenser 50 are accommodated in the CFC cylinder 8.

Next, the operation of the chlorofluorocarbon regenerating apparatus R according to the present invention will be described.
(1) When the gas opening / closing valve 3 of the recovery chloroon cylinder 1 is opened, the recovery chlorofluorocarbon contained in the cylinder main body 2 is gasified by the pressure difference between the inside and the outside, and the gasified recovery chlorofluorocarbon is brought into the needle valve 30. Led.
(2) The oil mist contained in the recovered chlorofluorocarbons passes through the gap 37 while being charged by colliding with the tip 34a of the needle 34. Next, the charged recovered chlorofluorocarbon flows into the processing chamber 20 a of the electric dust collector 20 from the gas inlet 23.
(3) In the processing chamber 20a, the charged oil mist is removed by adhering to the dust collecting electrode 27 and is directed from the gas outlet 26 to the compressor 45.
(4) Next, the chlorofluorocarbon (gas) is compressed by the compressor 45 and liquefied again from the gas state in the condenser 50.
(5) The chlorofluorocarbon liquefied by the condenser 50 is removed from the moisture by the filter 56 and stored in the regenerated chlorofluorocarbon cylinder 8.

(Example)
An experiment for comparing the charge amount by the needle valve 30 of the Freon regenerator R according to the present invention with the charge amount of the coil-shaped tetrafluoroethylene resin tube used in the above-mentioned conventional Freon regenerator (Comparative Example) is as follows. Performed under conditions. The results are shown in Table 1.
Needle valve: Needle diameter 4mm
Tetrafluoroethylene resin tube: size outer diameter 6mm x inner diameter 4mm x length 1m
However, the flow rate of Freon containing 10% of refrigerating machine oil was 10 kg per hour, and the charge amount was measured for 1 minute.

  In addition, an experiment was performed in which the performance of the chlorofluorocarbon regenerating apparatus R according to the present invention was compared with the regenerating apparatus of the comparative example. The results are shown in Table 2. However, the operating time of the playback device was about 30 minutes.

  As a result of the experiment, it was confirmed that the device of the present invention was about 30 times as much as the oil mist in comparison with the comparative example. In addition, even when the voltage of the dust collecting electrode is ½ that of the comparative example, the apparatus of the present invention has a low evaporation residue (ratio of oil contained in the chlorofluorocarbon) and removes oil mist (impurities) in the chlorofluorocarbon. The rate was confirmed to be high.

Explanatory drawing of the chlorofluorocarbon regenerating apparatus according to the present invention Illustration of electric dust collector Schematic diagram showing the general configuration of the needle valve

Explanation of symbols

R ... CFC regeneration device 1 ... Cylinder for recovered CFC 2 ... Cylinder body 5 ... Heater device 8 ... Cylinder 15 for regeneration CFC ... First pipe 20 ... Electric type Dust collector 23 ... gas inlet 26 ... gas outlet 30 ... needle valve 37 ... gap (passage)
41 ... second pipe 45 ... compressor 50 ... condenser 55 ... third pipe 56 ... filter

Claims (4)

A needle valve is interposed in the first pipe connecting the gas outlet of the recovery CFC cylinder and the gas inlet of the electric dust collector, and the gas outlet of the electric dust collector and the inlet of the condenser are connected. Connect, and connect the outlet of the condenser and the liquid inlet / outlet of the cylinder for the regeneration flon,
By passing the gasified recovery CFC discharged from the recovery CFC cylinder through a narrow passage in the needle valve, the impurities contained in the CFC are charged, and the charged impurities are discharged by the electric dust collector. An apparatus for regenerating chlorofluorocarbon, wherein the chlorofluorocarbon, which has been removed and liquefied again from the gas state by the condenser, is accommodated in a regenerative chlorofluorocarbon cylinder.   2. The chlorofluorocarbon regenerating apparatus according to claim 1, wherein a heater body is provided in a cylinder main body of the recovery chlorofluorocarbon cylinder.   The CFC regeneration apparatus according to claim 1 or 2, wherein a compressor is interposed in a second pipe connecting the electric dust collector and the condenser.   The CFC according to any one of claims 1 to 3, wherein a filter that removes moisture contained in the CFC is interposed in a third pipe line that connects the condenser and the regenerative CFC cylinder. Playback device.

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