EP1102018A1 - Verfahren zur Reinigung einer Rohrleitung, Reinigungslaufteufels zum Gebrauch darin, und Rohrleitungreinigungsvorrichtung - Google Patents

Verfahren zur Reinigung einer Rohrleitung, Reinigungslaufteufels zum Gebrauch darin, und Rohrleitungreinigungsvorrichtung Download PDF

Info

Publication number
EP1102018A1
EP1102018A1 EP00124725A EP00124725A EP1102018A1 EP 1102018 A1 EP1102018 A1 EP 1102018A1 EP 00124725 A EP00124725 A EP 00124725A EP 00124725 A EP00124725 A EP 00124725A EP 1102018 A1 EP1102018 A1 EP 1102018A1
Authority
EP
European Patent Office
Prior art keywords
piping
compound
air conditioner
cleaning method
oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00124725A
Other languages
English (en)
French (fr)
Inventor
Hironao Numoto
Akira Fujitaka
Yasunori Himeno
Toshiaki Ando
Shigehiro Sato
Yuichi Yakumaru
Masakatsu Iwashimizu
Eiji Nakatsuno
Yasuaki Matsumoto
Seiji Ota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP32510299A external-priority patent/JP2001141390A/ja
Priority claimed from JP2000037848A external-priority patent/JP2001227892A/ja
Priority claimed from JP2000039567A external-priority patent/JP3733823B2/ja
Priority claimed from JP2000039566A external-priority patent/JP3829566B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP1102018A1 publication Critical patent/EP1102018A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0553—Cylindrically shaped pigs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
    • F41B11/80—Compressed-gas guns, e.g. air guns; Steam guns specially adapted for particular purposes
    • F41B11/87—Compressed-gas guns, e.g. air guns; Steam guns specially adapted for particular purposes for industrial purposes, e.g. for surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/22—Cleaning ducts or apparatus

Definitions

  • the present invention relates to a cleaning method of piping in installation work of an air conditioner, compounds used therein, and a piping cleaning apparatus.
  • a refrigerating apparatus such as air conditioner has a compression type heat pump using hydrochlorofluorocarbon (HCFC) refrigerant such as R22.
  • HCFC hydrochlorofluorocarbon
  • This kind of refrigerating apparatus has a refrigerant circuit mainly connecting the compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger by means of refrigerant piping.
  • a large-scale air conditioner such as building air conditioner is widely used.
  • a building air conditioner comprises an outdoor unit installed at one position, and indoor units installed in a plurality of rooms.
  • the outdoor unit and indoor units are connected through a refrigerant piping. Therefore, the refrigerant piping is extended to every room, and connected to every corner of the building.
  • ester oil In the HFC refrigerant, as the refrigerating machine oil, ester oil, ether oil, or other synthetic oil is used.
  • the ester oil or ether oil is inferior in stability to the conventional mineral oil used in the HCFC refrigerant. It is hence likely to form foreign precipitates such as sludge solid matter called contamination. It therefore requires stricter moisture control or contamination control than in the prior art.
  • the refrigerant piping of a building air conditioner must be connected to every room, and its installation takes much time and cost. Therefore, when changing from the HCFC to the substitute refrigerant, it is preferred to use the existing piping. If the existing piping can be used, the installation cost is saved and the installation time is shortened, as compared with a completely new installation of building air conditioner.
  • the existing refrigerating apparatus when the refrigerant in the refrigerant circuit is changed from the HCFC refrigerant to the HFC refrigerant, the following problems occur. Firstly, since the refrigerant piping of the building air conditioner extends a long distance, strict moisture control and contamination control must be effect in a large scale, and its management is very difficult. Secondly, the existing piping must be cleaned thoroughly, and this cleaning takes enormous time and cost. That is, in the refrigerant piping, lubricating oil and other refrigerating machine oil of the compressor in the refrigerating apparatus may be adhered in a heavily deteriorated state. Accordingly, when replacing the refrigerant in the refrigerant circuit with a different refrigerant, it is most important to remove the existing refrigerating machine oil.
  • mineral oil is used as the refrigerating machine oil.
  • ester oil, ether oil or other synthetic oil is used as the refrigerating machine oil.
  • the stability of the ester oil or ether oil is inferior to the stability of the mineral oil. Accordingly, if the ester oil or ether oil is mixed with the mineral oil, contamination precipitates. If the mineral oil is left over in the refrigerant piping, therefore, when using the HFC refrigerant, contamination is formed in the refrigerant circuit, and this contamination exerts adverse effects on the operation of the refrigerating apparatus.
  • a piping cleaning method of air conditioner of the invention for removing foreign matter existing inside the piping installed between the indoor units and outdoor unit comprises:
  • the piping cleaning method of air conditioner further comprises a step of repeating the step (a), step (b), and step (c) a plurality of times.
  • the compound has a plurality of compounds, and the foreign matter in the piping is removed by the use of the plurality of compounds.
  • a compound used for cleaning the inside of the piping installed between the outdoor unit and indoor units of the invention comprises an outer circumference nearly coinciding with the outer circumference of the section of the inner wall of the piping, and a front surface nearly coinciding with the sectional shape of the piping. The compound passes through the piping while contacting with the inner wall of the piping, so that the foreign matter in the piping is removed.
  • a cleaning apparatus of the invention for cleaning the inside of the piping installed between the outdoor unit and indoor units of the air conditioner comprises:
  • the existing piping when changing from the air conditioner having the existing piping to a new air conditioner, the existing piping can be used as it is.
  • the air conditioner having an excellent reliability for a long period can be installed.
  • Fig. 1 is a schematic diagram showing an example of installation work of air conditioner of in-residence buried piping system in a field of application of the invention.
  • Fig. 2 is a schematic block diagram of copper piping cleaning method in an embodiment of the invention.
  • Fig. 3 is a drawing of a cleaning compound conveyed in copper piping in embodiments 4, 5 of the invention.
  • Fig. 4 is a drawing of a cleaning compound conveyed in copper piping in embodiment 6 of the invention.
  • Fig. 5 is a drawing of a cleaning compound conveyed in copper piping in embodiment 7 of the invention.
  • Fig. 6 is a drawing of a cleaning compound conveyed in copper piping in embodiment 8 of the invention.
  • Fig. 7 is a drawing of a cleaning compound conveyed in copper piping in embodiments 9 to 11 of the invention.
  • Fig. 8 is a drawing of a cleaning compound conveyed in copper piping in embodiments 12 to 15, and 32 of the invention.
  • Fig. 9 is a characteristic diagram showing the relation of temperature and viscosity of mineral oil.
  • Fig. 10 is a drawing of a cleaning compound conveyed in copper piping in embodiment 22 of the invention.
  • Fig. 11 is a drawing of a cleaning compound conveyed in copper piping in embodiment 23 of the invention.
  • Fig. 12 is a drawing of a cleaning compound conveyed in copper piping in embodiment 24 of the invention.
  • Fig. 13 is a drawing of a cleaning compound conveyed in copper piping in embodiments 25 to 27, 31, and 33 of the invention.
  • Fig. 14 is a drawing of a cleaning hydrophilic compound conveyed in copper piping in embodiment 27 of the invention.
  • Fig. 15 is a characteristic diagram showing the relation of temperature and viscosity of HAB oil used in the invention.
  • Fig. 16 is a sectional structural view of split type ultrafine fiber used in an embodiment of the invention.
  • Fig. 17 is a sectional structural view of peeling type ultrafine fiber used in an embodiment of the invention.
  • Fig. 18 is a structural diagram of a cleaning compound conveyed in piping in embodiment 35 of the invention.
  • Fig. 19 is a structural diagram of a cleaning compound conveyed in piping in embodiment 36 of the invention.
  • Fig. 20 is a structural diagram of a cleaning compound conveyed in piping in embodiment 37 of the invention.
  • Fig. 21 is a structural diagram of a cleaning compound conveyed in piping in embodiment 38 of the invention.
  • Fig. 22 is a structural diagram of a cleaning compound conveyed in piping in embodiment 39 of the invention.
  • Fig. 23 is a characteristic diagram showing the relation between temperature and viscosity of hard alkyl benzene oil used in the invention.
  • Fig. 24 is a structural diagram of a cleaning compound conveyed in piping in embodiment 40 of the invention.
  • Fig. 25 is a structural diagram showing a piping cleaning method in embodiment 41 of the invention.
  • Fig. 26 (a) is a graph showing oil viscosity and temperature changes
  • Fig. 26 (b) is a graph showing a pressurizing method in piping.
  • Fig. 27 (a) is a sectional structural diagram showing compound and inserting jig used in embodiment 42 of the invention
  • Fig. 27 (b) is a perspective view of the inserting jig.
  • Fig. 28 (a) is a sectional structural diagram showing compound and inserting jig used in embodiment 43 of the invention, and Fig. 28 (b) is a perspective view thereof.
  • Fig. 29 (a) is a sectional structural diagram showing compound and inserting jig used in embodiment 44 of the invention, and Fig. 29 (b) is a perspective view thereof.
  • Fig. 30(a) is a sectional structural diagram showing compound and inserting jig used in embodiment 45 of the invention, and Fig. 30(b) is a perspective view thereof.
  • a first piping cleaning method of air conditioner of the invention is characterized by removing foreign matter existing inside by conveying a compound from a piping opening by a compressed gas, in a piping connecting between indoor units and outdoor unit of air conditioner.
  • a second piping cleaning method of air conditioner of the invention is characterized by removing foreign matter existing inside by conveying a compound from a piping opening by a compressed gas a plurality of times, in a piping connecting between indoor units and outdoor unit of air conditioner.
  • a third piping cleaning method of air conditioner of the invention is characterized by removing foreign matter existing inside by conveying two or more compounds from a piping opening by a compressed gas, in a piping connecting between indoor units and outdoor unit of air conditioner.
  • At least one of the two or more compounds is an lipophilic (or oleophilic) compound, and at least one is a hydrophilic compound.
  • the compound is conveyed from the piping opening by the compressed gas.
  • the compound is nearly in a form of circular cylinder, having flexibility and elasticity for retaining the degree of freedom of shape in the piping.
  • a groove is processed on the side surface of the compound.
  • the groove processing is threading, spiral groove processing, or parallel groove processing.
  • the shape of the compound is concave in the conveying direction.
  • the compound is nearly in a form of circular cylinder, and the outside diameter of the compound is larger than the inside diameter of the piping.
  • an O-ring elastomer is disposed at the side surface of the compound.
  • flocky processing is applied at the side surface of the compound.
  • the side surface of the compound is covered with a nonwoven cloth.
  • At least the side surface of the compound has lipophilic (oleophilic) property.
  • the bulk density of the compound is in a range of 0.1 to 0.6 g/ml.
  • the compound is an elastomer, of which hardness is 60 or less in spring type A.
  • the compound is an elastomer, and more specifically a foamed molded element with a bulk density of 0.1 to 0.6 g/ml.
  • the side surface of the compound is composed of a plastic film material or elastomer film material, containing liquid in its inside.
  • the side surface of the compound is composed of a plastic film material or elastomer film material covered with a nonwoven cloth.
  • the side surface of the compound is composed of a plastic film material or elastomer film material covered with a woven cloth of ultrafine fibers.
  • the compound is filled with oleophilic fibers at a bulk density of 0.1 to 0.6 g/ml.
  • the compound is a lipophilic (oleophilic) material with a bulk density of 0.05 to 0.6 g/ml, and oil is contained in the compound when conveying the compound from the piping opening by a compressed gas.
  • the oil is hard alkyl benzene.
  • the oil should be properly selected so as to have a dynamic viscosity of 9.0 to 74.8 mm 2 /s at 40°C, and a low viscosity at low temperature and a high viscosity at high temperature depending on the environmental conditions.
  • At least one of the two or more compounds is a lipophilic (oleophilic) compound, and at least one is a hydrophilic compound, the compound includes at least one of the following features:
  • At least one of the two or more compounds is a lipophilic (oleophilic) compound, and at least one is a hydrophilic compound, and the bulk density of the hydrophilic compound is 0.1 to 0.6 g/ml.
  • the hydrophilic compound is a woven cloth of ultrafine fibers at the side surface, in the existing piping cleaning method of air conditioner.
  • the ultrafine fibers are 0.3 denier or less.
  • the ultrafine fibers are of split type or of peeling type.
  • the conveying pressure of the compressed gas is 0.5 to 5 kgf/cm 2 .
  • the compressed gas is a dry gas of which dew point is -30°C or less.
  • the compressed gas is air or nitrogen.
  • a piping cleaning method of air conditioner in a first embodiment of the invention comprises a step of conveying a compound from a piping opening by a compressed gas.
  • the remaining oil sticking to the piping inner wall is discharged out of the piping by the excluding volume effect caused when the compound is conveyed by the compressed gas. Therefore, when the existing piping is used continuously as the piping for the new air conditioner, the reliability is obtained for a long period.
  • a piping cleaning method of air conditioner in a second embodiment of the invention comprises a step of repeating a plurality of times a step of conveying a compound from a piping opening by a compressed gas.
  • this constitution by repeating a plurality of times the step of discharging out of the piping by the excluding volume effect of compound, the remaining oil sticking to the piping inner wall is further cleaned. Therefore, when the existing piping is used continuously as the piping for the new air conditioner, a secure reliability is obtained for a long period.
  • a piping cleaning method of air conditioner in third and fourth embodiments of the invention comprises a step of conveying two or more compounds from a piping opening by a compressed gas.
  • this constitution by conveying two or more compounds having mutually contradictory properties such as oleophilic and hydrophilic characteristics, not only the oily matter but also the moisture left over in the piping can be excluded sufficiently.
  • a more secure reliability is obtained for a long period.
  • a piping cleaning method of air conditioner in a fifth embodiment of the invention comprises a step of cleaning the piping after operating for a specific time in heating mode.
  • the copper piping can be warmed sufficiently. As a result, the oil removing effect is enhanced.
  • a piping cleaning method of air conditioner in a sixth embodiment of the invention is characterized by the compound which is nearly in a form of circular cylinder and has a high degree of freedom.
  • the compound being conveyed is flexible and elastic, if the piping has bent parts, it can be cleaned sufficiently, and if the compound to be conveyed is relatively long, clogging in the midst of conveying can be prevented. As a result, the oil removing effect is enhanced.
  • a piping cleaning method of air conditioner in seventh and eighth embodiments of the invention comprises a step of processing a groove on the side surface of the compound.
  • this constitution by threading, spiral groove processing, or parallel groove processing on the side surface of the resin, when the resin is conveyed, the threads are advanced while colliding against the inner wall of the copper piping. As a result, the deposit scraping effect is great. Besides, since the threads advance while colliding against the inner wall by point contact, the frictional resistance is small.
  • a piping cleaning method of air conditioner in a ninth embodiment of the invention is characterized by the shape of the compound which is concave in the conveying direction.
  • the compound to be conveyed since the compound to be conveyed has a concave shape, the deposit excluded from the copper piping inner wall can be discharged outside while depositing in the concave shape.
  • the compound is made of a soft material, and its concave shape is a slightly trapezoidal shape or bellows shape in the advancing direction of the concave shape. Therefore, the sliding portion of the compound and the copper piping is reduced in area.
  • a piping cleaning method of air conditioner in a tenth embodiment of the invention is characterized by the compound of which outside diameter is larger than the inside diameter of the piping.
  • the compound advances while rubbing against the copper pipe inner wall, the deposit scraping effect is enhanced.
  • a piping cleaning method of air conditioner in an eleventh embodiment of the invention is characterized by that an O-ring elastomer is disposed at the side surface of the compound.
  • an O-ring elastomer is disposed at the side surface of the compound.
  • a piping cleaning method of air conditioner in a twelfth embodiment of the invention is characterized by that the compound has a side surface treated by flocky processing.
  • the outside diameter of the molded element treated by flocky processing has a larger outside diameter than the copper piping. Therefore, the flocky portion advances while rubbing against the copper piping inner wall, so that the deposit scraping effect is enhanced.
  • a piping cleaning method of air conditioner in a thirteenth embodiment of the invention is characterized by that the side surface of the compound is covered with a nonwoven cloth.
  • the nonwoven cloth is, for example, an oleophilic material such as polypropylene (PP) nonwoven cloth, or an oleophilic processed material such as polyester nonwoven fabric.
  • PP polypropylene
  • a piping cleaning method of air conditioner in a fourteenth embodiment of the invention is characterized by that at least the side surface of the compound has lipophilic propertr or oleophilic property.
  • the side surface of the compound or the compound itself is oleophilic, the sliding resistance is reduced when the compound is conveyed in the copper piping.
  • the compound itself since the compound itself is oleophilic, the compound sufficiently absorbs the residual oil. The compound itself is swollen, and the scraping effect of the deposit in the copper piping is secure and enhanced.
  • a piping cleaning method of air conditioner in a fifteenth embodiment of the invention is characterized by that the bulk density of the compound is in a range of 0.1 to 0.6 g/ml.
  • the molded element of lipophilic (or oleophilic) polypropylene long filament adsorbs mineral oil, and the molded element is gradually swollen, and the density of the molded element increases.
  • the amount of nitrogen slipping the conveyed molded element is decreased.
  • the effect of removing the residual oil in the copper piping is extremely enhanced.
  • a piping cleaning method of air conditioner in a sixteenth embodiment of the invention is characterized by that the compound is an elastomer, of which hardness is 60 or less in spring type A.
  • the flexible and elastic rubber can be lowered in hardness so as to be applicable in the bent parts of the piping.
  • the feature of the elastomer can be sufficiently utilized.
  • the rubber is flexible and elastic, if the compound to be conveyed is somewhat extended in length, clogging of the compound in the midst of conveying can be prevented. As a result, the oil excluding rate is enhanced.
  • a piping cleaning method of air conditioner in a seventeenth embodiment of the invention is characterized by that the compound is an elastomer, and more specifically a foamed molded element with a bulk density of 0.1 to 0.6 g/ml.
  • the elastomer since the elastomer has a foamed molded element, the flexibility and elasticity are further enhanced. Hence, even in the extended length state of the compound to be conveyed, clogging of the compound in the midst of conveying can be prevented. As a result, the oil excluding rate is enhanced.
  • a piping cleaning method of air conditioner in an eighteenth embodiment of the invention is characterized by that the side surface of the compound is composed of a plastic film material or elastomer film material, containing liquid in its inside.
  • the side surface of the compound is composed of a plastic film material or elastomer film material, containing liquid in its inside.
  • a piping cleaning method of air conditioner in a nineteenth embodiment of the invention is characterized by that the side surface of the compound is composed of a plastic film material or elastomer film material covered with a nonwoven cloth.
  • the side surface of the compound is composed of a plastic film material or elastomer film material covered with a nonwoven cloth.
  • a piping cleaning method of air conditioner in a twentieth embodiment of the invention is characterized by that the side surface of the compound is composed of a plastic film material or elastomer film material covered with a woven cloth of ultrafine fibers.
  • the side surface of the compound is composed of a plastic film material or elastomer film material covered with a woven cloth of ultrafine fibers.
  • a piping cleaning method of air conditioner in a twenty-first embodiment of the invention is characterized by that the compound is filled with lipophilic (oleophilic) fibers at a bulk density of 0.1 to 0.6 g/ml.
  • the wiping effect of the deposit in the copper piping inner wall is enhanced.
  • the scraped copper powder or iron powder is discharged outside of the piping without dropping out.
  • the lipophilic (oleophilic) PP fiber molded element adsorbs mineral oil, and is gradually swollen, and the density of the molded element increases. In this state, the molded element as the compound is conveyed by compressed nitrogen. Hence, the effect of eliminating the residual oil in the copper piping is extremely enhanced.
  • a piping cleaning method of air conditioner in a twenty-second embodiment of the invention further comprises a step of containing oil in the compound before cleaning.
  • the lipophilic (oleophilic) PP long filament molded element adsorbs mineral oil, if the remaining oil is less, the effect of removing copper powder or iron powder is small.
  • the compound is conveyed in the piping in a state of containing oil, and therefore if the remaining oil is less, the remaining oil, copper powder and iron powder are sufficiently eliminated.
  • a piping cleaning method of air conditioner in a twenty-fourth embodiment of the invention is characterized by that the bulk density of the hydrophilic compound is in a range of 0.1 g/ml to 0.6 g/ml.
  • the hydrophilic compound with bulk density of 0.1 to 0.6 g/ml has a sufficient flexibility, and by adsorbing water, it is gradually swollen, and the density of the molded element increases. In this state, the compound is conveyed by compressed nitrogen. Hence, the effect of removing the residual moisture in the copper piping is extremely enhanced.
  • a piping cleaning method of air conditioner in a twenty-fifth embodiment of the invention is characterized by that the side surface of the hydrophilic compound is has a woven cloth of ultrafine fibers.
  • the side surface of the compound is covered with ultrafine fibers, the deposit wiping effect of the copper piping inner wall is enhanced.
  • the scraped copper powder or iron powder is discharged outside of the piping without dropping out.
  • the compound is hydrophilic, by adsorbing moisture, the compound is gradually swollen, and the density of the molded element increases. In this state, the compound is conveyed by compressed nitrogen. Hence, the effect of removing the residual oil in the copper piping is extremely enhanced.
  • a piping cleaning method of air conditioner in a twenty-sixth embodiment of the invention is characterized by that the oil contains hard alkyl benzene (HAB oil).
  • HAB oil hard alkyl benzene
  • the hard alkyl benzene is replaced with the oil deteriorated oil remaining in the piping. Accordingly, if fresh hard alkyl benzene oil is left over in the piping, it has little effect on the reliability of the air conditioner.
  • a piping cleaning method of air conditioner in a twenty-seventh embodiment of the invention is characterized by that the oil to be used includes various types of oil depending on the environmental conditions of the installation work. That is, oil of low viscosity is used when the environment is low in temperature, and oil of high viscosity is used when the temperature is high.
  • oil of low viscosity is used when the environment is low in temperature
  • oil of high viscosity is used when the temperature is high.
  • a piping cleaning method of air conditioner in a twenty-eighth embodiment of the invention is characterized by that the ultrafine fibers are 0.3 denier or smaller in diameter.
  • the cleanliness in the piping is further enhanced after wiping off copper powder and iron powder
  • a piping cleaning method of air conditioner in a twenty-ninth embodiment of the invention is characterized by that the ultrafine fibers have either the split type spinning shape or of peeling type spinning shape.
  • the ultrafine fibers have a triangular or flat section with a sharp edge. Accordingly, once scraped off, the contamination is entrapped in the entangled fibers. As a result, the scraped contamination is hardly desorbed again, and the cleanliness of the piping is further improved.
  • a piping cleaning method of air conditioner in a thirtieth embodiment of the invention is characterized by that the conveying pressure of the compressed gas is 0.5 to 5 kgf/cm 2 .
  • a piping cleaning method of air conditioner in a thirty-first embodiment of the invention is characterized by that the compressed gas is a dry gas of which dew point is -30°C or less.
  • the compressed gas is a dry gas of which dew point is -30°C or less.
  • a hollow filter of polyimide or the like By passing the compressed gas through a hollow filter of polyimide or the like, dry gas with dew point of -40°C or less is obtained.
  • the moisture left over at the time of completion of piping cleaning work can be lowered.
  • By feeding dry gas the moisture existing inside is discharged while accompanying the conveyed gas.
  • a piping cleaning method of air conditioner in a thirty-second embodiment of the invention is characterized by that the compressed gas is air or nitrogen.
  • the compressed air can be obtained easily, and the working efficiency of installation is further enhanced.
  • Fig. 1 is a schematic diagram showing an installation work of air conditioner of in-residence buried system in an exemplary embodiment of the invention.
  • the air conditioner comprises one outdoor unit 1, a branch unit 5, and three indoor units A2, B3, C4.
  • the copper piping is buried in the dwelling wall and installed in zigzag state in consideration of the appearance of the dwelling.
  • the copper piping may extend a distance of as long as 30 m. In such a case, when burying the copper piping newly, it takes enormous time and cost.
  • Fig. 2 is a schematic block diagram of copper piping cleaning method in an embodiment of the invention. By the method shown in Fig.
  • a compound 7 to be conveyed is inserted into one copper piping 6. At this time, depending on the type of the compound 7, the compound 7 is pushed into the copper piping 6 by force.
  • the flared copper piping is connected to a pressure-proof hose 9 linked to a nitrogen cylinder 8 through a nipple (not shown).
  • a regulator valve 10 disposed in the nitrogen cylinder 8 in closed state, the primary pressure is released. While observing a gauge 11, the regulator valve 10 is opened gradually. As a result, nitrogen gas is sent into the copper piping under pressure.
  • the compound 7 is moved while eliminating oil and other foreign matter remaining inside, and is discharged from other exit. At this time, the oil and foreign matter remaining inside are discharged simultaneously with the compound 7.
  • the nitrogen cylinder 8, pressure-proof hose 9, regulator valve 10, and gauge 11 compose a compressed gas generator.
  • the compound used in this system has various forms as explained in the following specific embodiments.
  • the conventional air conditioner using the R22 refrigerant of HCFC is replaced with a new air conditioner using the R410A refrigerant of HFC.
  • the air conditioner using the R410A refrigerant of HFC is replaced with other air conditioner using the same R410A refrigerant.
  • the air conditioner using the R410A refrigerant contains refrigerating machine oil of ester oil or refrigerating machine oil of ether oil.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, a polypropylene molded element of 7.82 mm in outside diameter and 7.0 mm in length with end face curvature of R2 was prepared. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound polypropylene molded element
  • the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping.
  • about 60% of the remaining mineral oil in the piping was removed.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, a polypropylene molded element of 7.82 mm in outside diameter and 7.0 mm in length with end face curvature of R2 was prepared. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound polypropylene molded element
  • the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 50% of the remaining mineral oil in the piping was removed.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, a polypropylene molded element of 7.82 mm in outside diameter and 7.0 mm in length with end face curvature of R2 was prepared. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound (polypropylene molded element) was conveyed in the piping. Successively, the oil sticking to the polypropylene molded element was wiped by a cloth. Then the wiped polypropylene molded element was conveyed again in the piping in the same manner as above. As a result, about 70% of the remaining mineral oil in the piping was removed.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • an acrylonitrile-butadiene-styrene (ABS) resin molded element as shown in Fig. 3 was prepared.
  • the ABS resin molded element 12 has a groove 12a. That is, the ABS resin molded element 12 has an outside diameter of 7.82 mm, a length of 7.0 mm, and a thread pitch of 1 mm.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 70% of the remaining mineral oil in the piping was removed.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • an acrylonitrile-butadiene-styrene (ABS) resin molded element as shown in Fig. 3 was prepared.
  • the ABS resin molded element 12 has an outside diameter of 7.82 mm, a length of 7.0 mm, and a thread pitch of 1 mm.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound ABS resin molded element
  • the oil sticking to the ABS molded element was wiped by a cloth.
  • the wiped ABS molded element was conveyed again in the piping in the same manner as above. As a result, about 85% of the remaining mineral oil in the piping was removed.
  • threads are formed on the side surface of the compound.
  • the threads advance while colliding against the inner wall of the copper piping.
  • the deposit scraping effect of the compound in the piping is improved.
  • the compound advances while colliding against the inner wall of the piping in point contact. Hence, the friction resistance of piping is decreased.
  • threads are formed in the compound, but not limited to this constitution, the side surface of the compound may also have spiral groove or parallel groove. In such constitution, too, the same effects as above were obtained.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • an acrylonitrile-butadiene-styrene (ABS) resin molded element 13 and an O-ring elastomer 14 installed on the outer circumference of the ABS molded element as shown in Fig. 4 were prepared.
  • the ABS resin molded element 13 has an outside diameter of 6.0 mm and a length of 7.0 mm, and a groove is formed in the outer circumference of the ABS resin molded element 13.
  • the O-ring elastomer 14 is put in this groove.
  • the O-ring elastomer 14 is made of chloroprene rubber (CR), and the wire diameter of the O-ring is about 1.5 mm, and the hardness is 30 in spring type A.
  • Two O-rings are placed as the O-ring 14 placed on the outer circumference of the ABS resin molded element 13.
  • the O-ring 14 is elastic. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 80% of the remaining mineral oil in the piping was removed.
  • the elastic O-rings 14 by disposing the elastic O-rings 14 on the outer circumference of the molded element 13, undulations are shaped on the outer surface of the compound (to be conveyed). As a result, the sliding resistance when the compound is conveyed can be decreased. Moreover, by lowering the hardness of the O-ring, the maximum diameter of the compound (to be conveyed) may be set slightly larger than the inside diameter of the copper piping. Accordingly, when the compound is conveyed in the piping, the O-ring 14 advances while rubbing against the inner wall of the copper piping. As a result, the deposit scraping effect of the compound in the piping is enhanced.
  • the number of O-rings 14 placed on the outer circumference of the ABS resin molded element 13 is not particularly limited, but, for example, one O-ring, or a plurality of O-rings such as three or four may be used.
  • the chloroprene rubber is used, but other elastic material may be also used.
  • Usable elastic materials include, for example, butadiene-acrylonitrile copolymer (NBR), ethylene-propylene copolymer (EPDM), isobutene-isoprene copolymer (IIR), and silicone rubber.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • a soft vinyl chloride resin molded element 15 as shown in Fig. 5 was prepared.
  • the resin molded element 15 has a cap shape with a recess 15a, having a bottom surface of 7.50 mm in diameter, a top surface of 7.92 mm in diameter ⁇ 15 mm, and a thickness of 1.5 mm. This compound was inserted into the copper piping in the atmosphere of 25°C.
  • the compound was inserted into the piping so that the opening side of the recess 15a may be at the insertion leading end, that is, the opening side of the recess may be in the advancing direction.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 90% of the remaining mineral oil in the piping was removed.
  • the resin molded element 15 as the compound has a slightly trapezoidal shape in the advancing direction. Therefore, while the opening periphery of the recess 15a is sliding on the inner wall of the piping, the compound moves in the piping.
  • the cap-shaped soft vinyl chloride resin molded element 15 has an elastic property. Accordingly, the sliding portion of the compound and the piping is decreased. Since the recess of the molded element 15 is inserted in the conveying direction the deposit removed from the inner wall of the piping is discharged outside while depositing in the recess.
  • cap-shaped molded element 15 for example, CR, EPDM rubber, or styrene elastomer may be also used.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • mineral oil tradename: SUNISO 4GS
  • NBR acrylonitrile-butadiene-rubber
  • the molded element 16 has a bellows type cap shape with inside diameter of 4.92 mm, length of 15 mm, and thickness of 1.5 mm.
  • the hardness of the NBR is 50 in spring type A. This compound was inserted into the copper piping in the atmosphere of 25°C.
  • the compound was inserted into the piping so that the bellows opening side may be at the insertion leading end, that is, the bellows opening side may be in the advancing direction.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 90% of the remaining mineral oil in the piping was removed.
  • the side surface of the compound is in the bellows profile, the sliding portion area of the compound and piping is small, and the sliding resistance is small. Hence, the compound moves smoothly in the piping. As a result, the working efficiency is enhanced.
  • bellows type molded element 16 for example, CR, EPDM rubber, or styrene elastomer may be also used.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • the compound has a flocky shape as shown in Fig. 7. That is, the compound has a molded element 17, and hair fibers 18 disposed around the molded element 17.
  • the molded element 17 is made of acrylonitrile-butadiene-styrene (ABS) resin, and has a columnar shape of 6.5 mm in diameter and 7 mm in length.
  • the hair fibers 18 are made of polyamide (tradename: Nylon), and have flocky portions of 1.0 mm in height.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the hair fibers 18 of the compound, and is discharged from other exit of the piping. As a result, about 90% of the remaining mineral oil in the piping was removed.
  • the compound comprising the ABS molded element 17 and hair fibers 18, the piping and mineral oil same as in exemplary embodiment 9 were used. At a pressure of about 4 kgf/cm 2 , the compound was conveyed in the piping. The other cleaning conditions are same as in exemplary embodiment 9. As a result, about 85% of the remaining mineral oil in the piping was removed.
  • the compound comprising the ABS molded element 17 and hair fibers 18, the piping and mineral oil same as in exemplary embodiment 9 were used. This compound was inserted into the copper piping in the atmosphere of 5°C. At a pressure of about 4 kgf/cm 2 , the compound was conveyed in the piping. The other cleaning conditions are same as in exemplary embodiment 9. As a result, about 80% of the remaining mineral oil in the piping was removed.
  • the flocky compound of hair fibers 18 is directly used as the side surface of the molded element 17, but not limited to this, a tape having flocky hair fibers may be adhered to the side surface of the molded element 17.
  • the outside diameter of the molded element 17 must be smaller than the inside diameter of the piping, but the outside diameter of the compound having the hair fibers 18 is preferred to be larger than the inside diameter of the piping. In this constitution, the hair fibers 18 advance while rubbing against the inner wall of the piping, and the deposit scraping effect of the compound in the piping is enhanced.
  • polyamide hair fibers 18 are used, but not limited to this example, hair fibers 18 may be also made of polypropylene fibers, polyester fibers, acrylic fibers, cotton fibers, wool fibers, and others.
  • the hair fibers 18 are lipophilic (oleophilic).
  • the lipophilic (oleophilic) hair fibers 18 are improved in the effect of removing the oil in the piping.
  • Polypropylene hair fibers are most oleophilic.
  • hair fibers are made of polypropylene, and excellent effects are expected.
  • the surface of the hair fibers 18 is processed by hard alkyl benzene (HAB) having a high viscosity. If the hair fibers 18 are not oleophilic, the hair fibers 18 are provided with oleophilic property by HAB surface treatment. As a result, the effect of removing the oil in the piping is further enhanced.
  • HAB hard alkyl benzene
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • the compound has a nonwoven cloth 20 as shown in Fig. 8. That is, the compound has a molded element 19, and the nonwoven cloth 20 disposed around the molded element 19.
  • the molded element 19 is made of acrylonitrile-butadiene-styrene (ABS) resin, and has a columnar shape of 5.0 mm in diameter and 8 mm in length.
  • the nonwoven cloth 20 is made of long filaments of polypropylene, and is wound around the molded element 19 in a thickness of 2.0 mm.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the nonwoven cloth 20 of the compound, and is discharged from other exit of the piping. In about 90 seconds after inserting the compound, the mineral oil was discharged from the piping. As a result, about 91% of the remaining mineral oil in the piping was removed.
  • the compound comprising the ABS molded element 19 and nonwoven cloth 20, the piping and mineral oil same as in exemplary embodiment 12 were used. At a pressure of about 4 kgf/cm 2 , the compound was conveyed in the piping. The other cleaning conditions are same as in exemplary embodiment 9. In about 30 seconds after inserting the compound, the mineral oil was discharged from the piping. As a result, about 91% of the remaining mineral oil in the piping was removed.
  • the compound comprising the ABS molded element 19 and nonwoven cloth 20, the piping and mineral oil same as in exemplary embodiment 12 were used.
  • the nonwoven cloth 20 is wound around the molded element 19 at a thickness of 2.0 mm.
  • This compound was inserted into the copper piping in the atmosphere of 40°C. At a pressure of about 4 kgf/cm 2 , the compound was conveyed in the piping.
  • the other cleaning conditions are same as in exemplary embodiment 9.
  • the mineral oil was discharged from the piping. As a result, about 92% of the remaining mineral oil in the piping was removed.
  • the compound comprising the ABS molded element 19 and nonwoven cloth 20, the piping and mineral oil same as in exemplary embodiment 12 were used.
  • the nonwoven cloth 20 is wound around the molded element 19 at a thickness of 2.0 mm.
  • This compound was inserted into the copper piping in the atmosphere of 5°C. At a pressure of about 4 kgf/cm 2 , the compound was conveyed in the piping.
  • the other cleaning conditions are same as in exemplary embodiment 9.
  • the mineral oil was discharged from the piping. As a result, about 85% of the remaining mineral oil in the piping was removed.
  • the nonwoven cloth 20 is made of long filaments of polypropylene, and is oleophilic. Accordingly, the nonwoven cloth 20 adsorbs mineral oil, and is gradually swollen, and the density becomes higher in the swollen portion.
  • the compound is conveyed by compressed nitrogen in this state, the amount of nitrogen slipping on the outer circumference and inside of the compound to be conveyed is reduced. Therefore, the effect of eliminating the remaining oil in the piping is extremely enhanced.
  • the molded element 19 is present inside the compound, the compound has a strong strength as a structure. Accordingly, if only a small amount of oil is left over in the piping, clogging or breakage of the compound in the course of conveying can be prevented.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, a nitrile-butadiene-rubber (NBR) molded element with outside diameter of 7.92 mm, length of 7.0 mm, and end face curvature of R2 was prepared. The hardness of this NBR is about 50 in spring type A.
  • NBR nitrile-butadiene-rubber
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • the compound polypropylene molded element
  • the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping.
  • about 85% of the remaining mineral oil in the piping was removed.
  • NBR nitrile-butadiene-rubber
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, an ethylene propylene rubber (EPDM) foamed molded element with outside diameter of 7.93 mm, length of 21.0 mm, and end face curvature of R2 was prepared. The bulk density of this foamed molded element is about 0.2 g/ml. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose.
  • EPDM ethylene propylene rubber
  • the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound (polypropylene molded element) was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 94% of the remaining mineral oil in the piping was removed.
  • an EPDM foamed molded element with outside diameter of 7.93 mm, length of 28.0 mm, and end face curvature of R2 was prepared.
  • the bulk density of this foamed molded element is about 0.1 g/ml.
  • the piping cleaning experiment was conducted in the same manner as in exemplary embodiment 18.
  • the compound is a flexible and elastic rubber, or a foamed element of rubber.
  • the rubber can pass through bent parts in the existing piping.
  • the features as the elastomer can be sufficiently utilized.
  • the rubber is flexible and elastic, if the compound is long in length, its clogging in the piping is prevented. As the length of the compound is extended, the oil eliminating efficiency is enhanced.
  • the rubber foamed molded element having foams has a further excellent elasticity.
  • a foamed element having independent foams is preferred. In this constitution, the oil eliminating efficiency is further enhanced.
  • the hardness of the rubber used in the exemplary embodiments is 60 or less in spring type A. It is not inconvenient when the hardness of the compound is too small. However, as the compound of solid, not porous, type, the compound of which hardness is less than 20 in spring type A is hardly available. Hence, it is realistic to use rubber in a hardness range of 20 to 60.
  • a preferred bulk density was in a range of about 0.1 g/ml to about 0.6 g/ml in insertion state. At the bulk density of less than 0.1 g/ml, the mechanical strength of the compound is brittle, and there is a problem in actual use.
  • the NBR rubber and EPDM rubber foamed molded elements are used, but not limited to them, for example, CR, SBR, IIR, silicone, other rubber, and also PP elastomer, styrene elastomer, PP, PE resin, and other foamed molded elements can be used.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily. As the compound, a fiber molded element with outside diameter of 7.96 mm and length of 14.0 mm was prepared. This fiber molded element is made of long filaments of polypropylene (PP), and has a bulk density of about 0.2g/ml. This compound was inserted into the copper piping in the atmosphere of 25°C. A nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve.
  • PP polypropylene
  • the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 95% of the remaining mineral oil in the piping was removed.
  • a PP fiber molded element with outside diameter of 7.94 mm and length of 14.0 mm was prepared.
  • the bulk density of this fiber molded element is about 0.4 g/ml.
  • the piping cleaning experiment was conducted in the same manner as in exemplary embodiment 20. As a result, about 91% of the remaining mineral oil in the piping was removed.
  • the PP long fiber molded element and PP foamed molded element are oleophilic. Accordingly, when the compound is discharged from the piping, the PP long fiber molded element has sufficiently adsorbed mineral oil. As the PP long fiber molded element adsorbs mineral oil, the molded element is gradually swollen, and the density of the molded element becomes higher. When the compound is conveyed in the piping by compressed nitrogen in this state, the amount of nitrogen slipping on the compound can be reduced. Therefore, the effect of eliminating the remaining oil in the piping is extremely enhanced.
  • the bulk density of the fiber molded element is preferred to be 0.1 g/ml or more in insertion state. Further, to make sure of the properties (elasticity, flexibility) of the PP long fiber molded element or foamed molded element, the bulk density of the molded element is preferred to be 0.6 g/ml or less. Therefore, the bulk density of the PP molded element is preferred to be in a range of 0.1 to 0.6 g/ml.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), and 100 mg of copper powder with mean particle size of 2 ⁇ m were left over preliminarily.
  • a film 21 filled with hard alkyl benzene (HAB) 22 as shown in Fig. 10 was prepared.
  • This film 21 is a PP film with outside diameter of 8 mm, length of 20 mm, and thickness of 50 ⁇ m.
  • the inside of this film 21 is filled with HAB oil at density of 0.9 g/ml. This compound was pushed in and inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil and copper powder existing in the piping are cleaned by the compound, and are discharged from other exit of the piping. As a result, about 93% of the remaining mineral oil in the piping was removed. At the same time, about 50% of the copper powder was removed.
  • the inside of the compound is filled with liquid, and the compound has an elasticity. Accordingly, the compound has an excellent flexibility and elasticity. As a result, if the compound is considerably long, clogging of the compound in the piping is prevented.
  • the HAB oil has no effect on the air conditioner. Since the HAB oil is used in the embodiment, if the compound is broken in the midst of conveying, and the HAB oil is left over in the piping, no problem occurs.
  • the film containing the HAB oil is not limited to the PP film alone, but other film having an excellent oil-proof property may be used. For example, as the film 21, a PP elastomer film may be used.
  • the compound comprises, as shown in Fig. 11, a PP film 24 filled with HAB oil 25, and a nonwoven cloth 23 disposed around the PP film 24.
  • the nonwoven cloth 23 is made of long filaments of PP, and has a thickness of about 1 mm.
  • the piping cleaning experiment was conducted in the same manner as in exemplary embodiment 22. As a result, about 95% of the remaining mineral oil in the piping was removed. At the same time, about 70% of the copper powder was removed.
  • the compound comprises, as shown in Fig. 12, a PP film 27 filled with HAB oil 28, and ultrafine fibers 26 disposed around the PP film 27.
  • the ultrafine fibers 26 are made of polyester, and have a fiber diameter of about 0.1 denier.
  • the piping cleaning experiment was conducted in the same manner as in exemplary embodiment 22. As a result, about 95% of the remaining mineral oil in the piping was removed. At the same time, about 80% of the copper powder was removed.
  • the compound having the ultrafine fibers adhered to the surface of the PP film By using the compound having the ultrafine fibers adhered to the surface of the PP film, when the compound advances in the piping, it moves while rubbing against the inner wall of the compound, and the deposit wiping effect of the compound is further enhanced. It further improves the effect of the ultrafine fibers for eliminating metal powder such as copper powder and iron powder.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), 100 mg of copper powder with mean particle size of 2 ⁇ m, and 1000 mg of water were left over preliminarily.
  • the compound comprises, as shown in Fig. 13, a fiber molded element 29, and ultrafine fibers 30 disposed around the fiber molded element 29.
  • the ultrafine fibers 30 are woven in a cloth form.
  • the fiber molded element 29 is made of PP long filaments with outside diameter of 7.96 mm and length of 14 mm.
  • the fiber molded element 29 has a bulk density of 0.2 g/ml.
  • the ultrafine fibers 30 are made of polyester, having a fiber diameter of about 0.1 denier.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil and copper powder existing in the piping are cleaned by the compound, and are discharged from other exit of the piping. As a result, about 97% of the remaining mineral oil in the piping was removed. At the same time, about 90% of the copper powder was removed. The moisture removal rate was about 70%.
  • a second compound was conveyed in the piping at a pressure of about 3 kgf/cm 2 .
  • the second compound is a circular columnar foamed molded element with outside diameter of 7.96 mm and length of 14 mm, and the foamed molded element has a bulk density of about 0.3 g/ml, being made of refined cellulose.
  • the foamed molded element made of refined cellulose has a water absorbing function.
  • the other conditions are same as in the foregoing exemplary embodiment 25. As a result, about 98% of the remaining mineral oil in the piping was removed. At the same time, about 95% of the copper powder was removed. The moisture removal rate was about 98%.
  • a second compound was conveyed in the piping at a pressure of about 3 kgf/cm 2 .
  • the second compound comprises, as shown in Fig. 14, a molded element 31, and ultrafine fibers 32 disposed around the molded element 31.
  • the molded element 31 is a crosslinked molded element of partially neutralized compound of polyacrylic acid with outside diameter of 7.96 mm and length of 14 mm, having a bulk density of 0.3 g/ml.
  • the ultrafine fibers 32 are made of polyester, having a fiber diameter of about 0.1 denier.
  • the crosslinked molded element of partially neutralized component of polyacrylic acid has a water absorbing function. As a result, about 98% of the remaining mineral oil in the piping was removed. At the same time, about 98% of the copper powder was removed. The moisture removal rate was about 98%.
  • the refined cellulose foamed molded element and polyacrylic acid partially neutralized crosslinked compound are used, but the compounds having water absorbing property applicable in the invention are not particularly limited, and others may be used, for example, saponified compound of copolymer of ester acrylate and vinyl acetate, crosslinked polyvinyl alcohol denatured matter, hydrolyte of starch-acrylonitrile graft polymer, starch-acrylate graft polymer, and partially crosslinked compound of polyethylene oxide.
  • the molded elements filled with pulp fiber, cotton, refined cellulose fiber, acrylate fiber and others may be also used.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), and 100 mg of copper powder with mean particle size of 2 ⁇ m were left over preliminarily.
  • the compound comprises a fiber molded element, and fresh hard alkyl benzene (HAB) immersed in the fiber molded element.
  • the fiber molded element is made of PP long filaments with outside diameter of 7.94 mm and length of 14 mm.
  • the fiber molded element has a bulk density of 0.2 g/ml.
  • the HAB oil has a dynamic viscosity of about 32.4 mm 2 /s when measured at 40°C.
  • This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping. While the compound is moving in the piping, the mineral oil existing in the piping is cleaned by the compound, and is discharged from other exit of the piping. As a result, about 98% of the remaining mineral oil in the piping was removed. At the same time, about 95% of the copper powder was removed.
  • the HAB oil has a dynamic viscosity of about 9.6 mm 2 /s when measured at 40°C.
  • the other conditions are same as in exemplary embodiment 28.
  • the HAB oil has a dynamic viscosity of about 65.7 mm 2 /s when measured at 40°C.
  • the other conditions are same as in exemplary embodiment 28.
  • the HAB oil immersed in the PP long fiber molded element it is preferred to use the HAB oil low in viscosity when the ambient temperature is low, and to use the HAB oil high in viscosity when the ambient temperature is high. In particular, if the HAB oil of low viscosity is used while the ambient temperature is high, the effect of immersing the fresh HAB oil into the PP long fiber molded element is extremely lowered.
  • the compound (conveyed material) moving in the piping, and the pipe wall oil present excellent effects against decrease of sliding resistance, but the effects are too strong, and the effect of scraping the oil of the inner wall of the piping is lowered.
  • the HAB oil is immersed in the PP long fiber molded element, with the viscosity lowered by warming the HAB oil, preferably, the HAB oil is impregnated in the fiber molded element, and the molded element containing the HAB is cooled, and the compound is introduced and conveyed in the piping. Therefore, it is preferred to select an appropriate HAB oil depending on the environmental conditions of the work of installing the air conditioner.
  • the viscosity grade of the commercial products of HAB oil are specified in JIS K 2001.
  • the viscosity grade suited to the embodiment is VG10 to VG68, which corresponds to the dynamic viscosity of 9.0 to 74.8 mm 2 /s as measured at 40°C.
  • the relation between the temperature and viscosity of the HAB oil is given in Fig. 15.
  • the bulk density of the PP long fiber molded element is preferred to be in a range of 0.05 to 0.6 g/ml.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), and 100 mg of copper powder with mean particle size of 2 ⁇ m were left over preliminarily.
  • the compound comprises, as shown in Fig. 13, a fiber molded element 29, and ultrafine fibers disposed around the fiber molded element 29.
  • the compound further comprises a fresh hard alkyl benzene (HAB) oil immersed in at least one of the fiber molded element and ultrafine fibers.
  • the HAB oil has a dynamic viscosity of about 32.4 mm 2 /s when measured at 40°C.
  • the fiber molded element 29 is made of PP long filaments with outside diameter of 7.96 mm and length of 14 mm.
  • the fiber molded element 29 has a bulk density of 0.2 g/ml.
  • the ultrafine fibers 30 are made of polyester, having a fiber diameter of about 0.1 denier. This compound was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), and 100 mg of copper powder with mean particle size of 2 ⁇ m were left over preliminarily.
  • the compound comprises, as shown in Fig. 8, a molded element, and a nonwoven cloth disposed around the molded element. Two compounds of the same composition were prepared.
  • the molded element is made of ABS resin with outside diameter of 5.0 mm and length of 8.0 mm.
  • the nonwoven cloth is made of polypropylene fibers, and is 2 mm in thickness. To begin with, a first one of the compounds was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping. Next, a second compound was inserted into the copper piping, and the piping was cleaned in the same manner. While these compounds are moving in the piping, the mineral oil and copper powder existing in the piping are cleaned by the compounds, and are discharged from other exit of the piping. As a result, about 95% of the remaining mineral oil in the piping was removed. At the same time, about 91% of the copper powder was removed.
  • a cleaning method of one piping is explained.
  • a plurality of pipings can be cleaned in the same method as this cleaning method of one piping.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS), and 100 mg of copper powder with mean particle size of 2 ⁇ m were left over preliminarily. Two compounds were prepared. A first compound comprises, as shown in Fig. 13, a fiber molded element, and ultrafine fibers disposed around the fiber molded element. A second compound further comprises fresh hard alkyl benzene (HAB) immersed at least in the fiber molded element and ultrafine fibers.
  • the HAB oil has a dynamic viscosity of about 32.4 mm 2 /s when measured at 40°C.
  • a second compound of the compounds was inserted into the copper piping in the atmosphere of 25°C.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled by a regulator valve. That is, at a pressure of about 2 kgf/cm 2 , the compound was conveyed in the piping.
  • a first compound was inserted into the copper piping, and the piping was cleaned in the same manner. While these compounds are moving in the piping, the mineral oil and copper powder existing in the piping are cleaned by the compounds, and are discharged from other exit of the piping. As a result, about 99.5% of the remaining mineral oil in the piping was removed. At the same time, about 99% of the copper powder was removed.
  • a copper piping of 3/8 inch (inside diameter 7.92 mm) was prepared by 30 m. Inside the piping, 50 g of mineral oil (tradename: SUNISO 4GS) was left over preliminarily.
  • a nitrogen cylinder was connected to the copper piping by means of a pressure-proof hose. While observing the gauge of the nitrogen cylinder, the nitrogen flow rate flowing into the copper piping was controlled at a pressure of about 5 kgf/cm 2 by a regulator valve. In this state, the nitrogen stream flowed in the piping for 5 minutes. That is, in this comparative example, without using the compound, only the nitrogen stream flows in the piping. By this nitrogen stream, the mineral oil existing in the piping is discharged from other exit of the piping. As a result, about less than 20% of the remaining mineral oil in the piping was removed.
  • deteriorated mineral oil SUNISO 4GS (total acid value 0.04)
  • the reliability of the air conditioner was tested. That is, 10g of deteriorated mineral oil is mixed in 260g of ester oil.
  • the refrigerating machine oil composed of 10g of deteriorated mineral oil and 260g of ester oil is mixed into 850g of R410A refrigerant of HFC.
  • the air conditioner containing such R410A refrigerant, deteriorated mineral oil and ester oil was operated for 2000 hours in reliability test in the cooling overload condition of discharge temperature of 115°C at outdoor unit temperature of 40°C and indoor unit temperature of 40°C. As a result, after operation for 2000 hours, no problem was found in the sliding parts of the compressor of the air conditioner.
  • a copper pipe of 3/8 inch (inside diameter 7.92mm) of 30m in length was prepared, and 2000 mg of water and 100mg of copper powder of mean particle size of 10 ⁇ m were preliminarily left over in the piping.
  • the inside of the piping was filled with about 10g of hard alkyl benzene (HAB, dynamic viscosity 15.1 mm 2 /s at 40°C) oil.
  • HAB hard alkyl benzene
  • the compound was soaked with HAB oil.
  • the compound soaked with HAB oil was inserted into the piping.
  • the nitrogen cylinder and the piping were connected by a pressure-proof hose.
  • the nitrogen flow rate was controlled by a regulator valve while observing the gauge.
  • the compound was conveyed in the piping.
  • the compound has a sandwich structure consisting of PP foamed body 63 (bulk density 0.15g/ml) of 7.96 ⁇ ⁇ 10 at the upstream side of the moving direction, PP foamed body 64 (bulk density 0.15 g/ml) of 8.00 ⁇ ⁇ 10 at the downstream side, and PP resin film 65 (7.91 ⁇ , thickness 100 ⁇ m) in the central part.
  • PP foamed body 63 bulk density 0.15g/ml
  • PP foamed body 64 bulk density 0.15 g/ml
  • PP resin film 65 7.91 ⁇ , thickness 100 ⁇ m
  • a pipe of 3/8 inch (inside diameter 7.92mm) of 30m in length was prepared, and 2000mg of water and 100mg of copper powder of mean particle size of 10 ⁇ m were preliminarily left over in the piping.
  • the inside was filled with about 10g of HAB oil (dynamic viscosity 15.1 mm 2 /s at 40°C).
  • HAB oil dynamic viscosity 15.1 mm 2 /s at 40°C.
  • the compound was soaked with HAB oil.
  • the compound soaked with HAB oil was inserted into the piping.
  • the nitrogen cylinder and the piping were connected by a pressure-proof hose, and the nitrogen flow rate was controlled by a regulator valve while observing the gauge, then the compound was conveyed at a pressure of about 1.0kgf/cm 2 .
  • the compound has a sandwich structure consisting of foamed molded body 66 of ethylene-propylene copolymer (EPDM) (bulk density 0.2 g/ml) of 7.96 ⁇ ⁇ 10 at the upstream side, EPDM foamed body 67 (bulk density 0.2 g/ml) of 8.00 ⁇ ⁇ 10 at the downstream side, and PP resin film 68 (7.91 ⁇ , thickness 100 ⁇ m) in the central part.
  • EPDM ethylene-propylene copolymer
  • PP resin film 68 7.91 ⁇ , thickness 100 ⁇ m
  • a copper pipe of 3/8 inch (inside diameter 7.92 mm) of 30 m in length was prepared. Inside the piping, 2000mg of water and 100 mg of copper powder of mean particle size of 10 ⁇ m were preliminarily left over. In the atmosphere at 20°C, the inside of the piping was filled with about lOg of HAB oil (dynamic viscosity 15.1 mm 2 /s at 40°C). As shown in Fig. 20, the compound was soaked with HAB oil. This compound was inserted into the piping. The nitrogen cylinder and the piping were connected by a pressure-proof hose, and the nitrogen flow rate was controlled by a regulator valve while observing the gauge, then at a pressure of about 1.2 kgf/cm 2 , the compound was conveyed.
  • HAB oil dynamic viscosity 15.1 mm 2 /s at 40°C
  • the compound has a sandwich structure consisting of PP foamed body 79 (bulk density 0.15 g/ml) of 7.96 ⁇ ⁇ 10 at the upstream side of the moving direction, molded body 70 wound with PP long filament nonwoven cloth (bulk density 0.15 g/ml) of 8.00 ⁇ ⁇ 10 at the downstream side, and PP resin film 71 (7.91 ⁇ , thickness 100 ⁇ m) in the central part.
  • PP foamed body 79 bulk density 0.15 g/ml
  • molded body 70 wound with PP long filament nonwoven cloth bulk density 0.15 g/ml
  • PP resin film 71 7.91 ⁇ , thickness 100 ⁇ m
  • a copper pipe of 3/8 inch (inside diameter 7.92mm) of 30 m in length was prepared. Inside the piping, 2000mg of water and 100 mg of copper powder of mean particle size of 10 ⁇ m were preliminarily left over. In the atmosphere at 20°C, the inside of the piping was filled with about 10 g of HAB oil (dynamic viscosity 15.1 mm 2 /s at 40°C). As shown in Fig. 21, the compound was soaked with HAB oil. This compound was inserted into the piping. The nitrogen cylinder and the piping were connected by a pressure-proof hose, and the nitrogen flow rate was controlled by a regulator valve while observing the gauge, then at a pressure of about 1.2 kgf/cm 2 , the compound was conveyed.
  • HAB oil dynamic viscosity 15.1 mm 2 /s at 40°C
  • the compound has a sandwich structure consisting of EPDM foamed body 72 (bulk density 0.2 g/ml) of 7.96 ⁇ ⁇ 10 at the upstream side of the moving direction, molded body 73 wound with PP long filament nonwoven cloth (bulk density 0.15 g/ml) of 8.00 ⁇ ⁇ 10 at the downstream side, and PP resin film 74 (7.91 ⁇ , thickness 100 ⁇ m) in the central part.
  • EPDM foamed body 72 bulk density 0.2 g/ml
  • molded body 73 wound with PP long filament nonwoven cloth bulk density 0.15 g/ml
  • PP resin film 74 7.91 ⁇ , thickness 100 ⁇ m
  • a pipe of 3/8 inch (inside diameter 7.92 mm) of 30 m in length was prepared. Inside the piping, 2000mg of water and 100mg of copper powder of mean particle size of 10 ⁇ m were preliminarily left over. In the atmosphere at 20°C, the inside of the piping was filled with about 10 g of HAB oil (dynamic viscosity 15.1 mm 2 /s at 40°C). As shown in Fig. 22, the compound was inserted into the piping. The nitrogen cylinder and the piping were connected by a pressure-proof hose, and the nitrogen flow rate was controlled by a regulator valve while observing the gauge, then at a pressure of about 1.2 kgf/cm 2 , the compound was conveyed.
  • HAB oil dynamic viscosity 15.1 mm 2 /s at 40°C
  • the compound has a sandwich structure consisting of PP foamed body 75 (bulk density 0.15 g/ml) of 7.96 ⁇ ⁇ 10 at the upstream side of the moving direction, molded body 77 adhered with polyester ultrafine textile cloth 76 (0.1 denier, 50 ⁇ m) and wound with PP long filament nonwoven cloth (bulk density 0.15 g/ml) of 8.00 ⁇ ⁇ 10 at the downstream side, and PP resin film 78 (7.91 ⁇ ⁇ , thickness 100 ⁇ m) in the central part.
  • PP foamed body 75 bulk density 0.15 g/ml
  • polyester ultrafine textile cloth 76 0.1 denier, 50 ⁇ m
  • PP long filament nonwoven cloth bulk density 0.15 g/ml
  • PP resin film 78 7.91 ⁇ ⁇ , thickness 100 ⁇ m
  • the compound is oleophilic; the step of conveying the compound in the piping comprises:
  • the compound has a first molded body positioned at the upstream side of the piping, and a second molded body positioned at the downstream side; and at least one of the first molded body and second molded body has a foamed body.
  • the compound has a first molded body positioned at the upstream side of the piping, and a second molded body positioned at the downstream side; and at least one of the first molded body and second molded body has a nonwoven cloth.
  • the compound has a first molded body positioned at the upstream side of the piping, and a second molded body positioned at the downstream side;
  • the oil impregnated in the PP long filament molded body it was preferred to use low viscosity type at lower temperature, and high viscosity type at higher temperature. That is, the compound and the oil on the pipe wall of the piping are effective for reducing the sliding resistance, but if the oil of too low viscosity is used, the compound conveying speed is faster and the effect of discharging moisture while growing the oil film is insufficient. Further, the pipe wall wiping effect is also lowered. To improve affinity of compound and oil, when impregnating intentionally, it was effective to heat to lower the viscosity, permeate sufficiently, and feed and convey in the copper piping after cooling.
  • the optimum dynamic viscosity of HAB oil varied.
  • the viscosity grade is specified in JIS K 2001, and the viscosity grade used in the embodiments was VG5 to VG32, which corresponded to dynamic viscosity of 4.14 to 35.2 mm 2 /s at 40°C.
  • the relation between the temperature and viscosity in HAB oil is shown in Fig. 23.
  • a thin oil film is formed inside the piping. Accordingly, the residual sticking water and foreign matter are discharged efficiently. Besides, as the oil sticks to the compound, the sliding resistance when the compound is conveyed is reduced, so that the pressure of the compressed gas can be lowered.
  • the fresh oil to be used should be selected in consideration of the compatibility with the oil contained in the compressor of the air conditioner to be installed, and an excellent effect was obtained if the oil used in cleaning of the piping was left over.
  • the compound of the air conditioner in exemplary embodiment 40 further comprises a rope disposed on at least one side of the rear side and front side.
  • the rope is wound around the peripheral end of at least one side.
  • At least one side has a curved surface formed by winding of the rope.
  • At least one end of the compound is wound with a rope-like matter.
  • the leading end of the compound becomes a curved surface.
  • the remaining oil and water sticking in the piping are discharged out of the piping by the excluding volume effect produced when the compound is conveyed by compressed gas. Therefore, as the piping of the air conditioner, a long-term reliability is obtained.
  • Fig. 24 is a structural diagram of the compound in embodiment 40 of the invention.
  • a compound 80 consists of nearly columnar foamed polyethylene 81 of 10 mm in outside diameter and 20 mm in length, a polypropylene sheet 82, and a rope 83.
  • the polypropylene sheet 82 is wound around the foamed polyethylene 81 by one turn.
  • the rope 83 is tied to both ends of the foamed polyethylene 81.
  • a piping forming a bend portion of flatness of 70% in the central part of the piping of 9.525 mm in outside diameter (inside diameter 7.925 mm) of 5m was prepared.
  • the inside of the pipe was preliminarily sealed with 50g of mineral oil and 16g of water.
  • the compound 80 was pressed and inserted into the piping.
  • the nitrogen cylinder and piping were connected to the piping by using a pressure-proof hose.
  • a pressure of 0.35 MPa the compound was conveyed in the pipe, and this operation was repeated three times.
  • the compound 80 passed without staying at the flat portion of the piping.
  • 85% of mineral oil and 99% of water were removed.
  • the compound passes smoothly the flat portion without staying still, and together with the excluding volume effect caused when conveyed by compressed gas, the oil and moisture remaining and sticking in the piping are effectively discharged out of the piping together with the compound.
  • the step of feeding the compressed gas into the piping includes a step of detecting when the compound is discharged from the piping.
  • the step of feeding the compressed gas into the piping includes a step of controlling the compressed gas while changing to a desired pressure.
  • the step of detecting when the compound is discharged from the piping includes a step of detecting the pressure of the compressed gas in the pipe at the compound inserting side of the piping.
  • the step of controlling the compressed gas to a desired pressure includes a step of detecting the flow rate of the compressed gas in the piping at the compound inserting side of the piping.
  • the step of feeding the compressed gas into the piping includes a step of detecting the pressure of the compressed gas by a pressure gauge installed in the connection piping for connecting the piping and the compressed gas generating device.
  • the cleaning apparatus further comprises: a detector for detecting when the compound is discharged from the piping.
  • the cleaning apparatus further comprises:
  • the detector is installed near the opening of the piping positioned at the insertion side of the compound.
  • the pressure generating device comprises: a flow rate detector for detecting the flow rate of the compressed gas, in which the flow rate detector is installed near the opening of the piping positioned at the insertion side of the compound.
  • the pressure generating device includes a pressure generating source (8), a connection piping (9), and a pressure gauge connected to the connection piping, and the pressure gauge detects the pressure of the compressed gas in the piping.
  • the compound 7 is inserted into the piping 6 from one end of the piping 6.
  • the opening end of the piping for inserting the compound 7 may be either at outdoor side or at indoor side.
  • oil, moisture and other foreign matter contained inside the piping are discharged. Accordingly, to prevent contamination of the indoor air by such discharge, it is preferred to feed the compound 7 from the indoor side opening end of the piping.
  • the compound 7 to be inserted is preferably foamed body having independent foams, or such foamed body with nonwoven cloth disposed on the surface thereof.
  • foamed body having independent foams various known materials may be used, such as polyethylene foam, polypropylene foam, and polystyrene foam.
  • a nonwoven cloth is disposed, and as such nonwoven cloth, polypropylene, polyester, rayon and other known materials may be used.
  • the nonwoven cloth it is preferred to use a material having a high moisture absorbing property, and such material can sufficiently wipe off the moisture from the surface of the piping. When the entire surface of the foamed body is covered with the nonwoven cloth, separation of nonwoven cloth in the piping is prevented.
  • the foamed body is nearly a circular column, and the nonwoven cloth is disposed along the side surface of the circular column, and the ends of the nonwoven cloth are bonded at least at the top or bottom side of the circular column.
  • the section of the compound to be inserted is a circular column conforming to the piping profile. As a result, the compound contacts tightly with the piping, so that the oil and moisture removing capacity is enhanced.
  • the foamed body and the nonwoven cloth may be adhered by any known method such as adhesive agent and double-sided adhesive tape.
  • the end of the nonwoven cloth should be joined, and separation of foamed body and nonwoven cloth in the piping is prevented.
  • the joining method may be any known method such as tying with string or fusing by heat.
  • a connection pipe 58 with pressure gauge is connected.
  • a compressed gas cylinder 59 includes a regulator 10 capable of setting the pressure arbitrarily, and the secondary pressure can be set freely while observing the primary pressure gauge.
  • the regulator 50 includes a valve 56 for passing compressed gas.
  • the compressed gas nitrogen, carbon dioxide, hydrocarbon or the like may be selected, and nitrogen is particularly preferred because the conveying pressure can be raised easily. Air may be also used as compressed gas. In this case, a compressor is used as the compressed gas generating device.
  • Fig. 26 (a) shows temperature effects of representative oil viscosity. Therefore, if the same piping and same compound are used, the starting pressure for stating move of the compound differs significantly depending on the ambient temperature.
  • a copper pipe of 9.525 mm in diameter was prepared (inside diameter 7.925 mm, length 30 m, corresponding to existing piping), and its inside was preliminarily sealed with 50 g of mineral oil and 16 g of moisture.
  • the compounds to be inserted into the piping are columnar polyethylene with outside diameter of about 10 mm and length of about 20 mm, and embossed polypropylene nonwoven cloth wound around its side by one turn, and the both ends of the nonwoven cloth are fused by heat.
  • the compound 7 was inserted into the piping 6 while compressing.
  • the connection pipe with pressure gauge 58, pressure-proof hose 51, regulator 50, and nitrogen cylinder 59 are connected sequentially. As shown in Fig.
  • the regulator 50 was adjusted while observing the secondary pressure gauge 52, and the pressure was gradually raised. Nitrogen somewhat escapes from the clearance between the compound 7 and the piping, but a similar pressure is applied between the regulator 50 and compound 7. Accordingly, the reading of the pressure gauge 58a of the connection piping with pressure gauge 58 also elevates in coincidence. When the pressure is further raised, the compound 7 begins to move at 0.15 MPa, and the compound moves while discharging oil, moisture and other foreign matter in the piping, and is finally discharged from the other end of the piping. When the compound 7 is discharged, the reading of the pressure gauge 8a drops nearly to the atmospheric pressure. As a result, it is evidently known that the compound 7 passes through the piping 6 and is discharged. When this operation is repeated once or twice, 95% of the mineral oil in the piping and 99% of moisture were removed.
  • the compound 7 may not pass completely through the connection piping 6 if the pressure of the compressed gas is raised.
  • a compressed gas cylinder 88 is connected to the other end of the connection piping 6, and the compressed air is blown in, so that the compound 7 may be conveyed by pressure.
  • the compound 57 may be easily removed from the connection piping.
  • the compound passes through the piping, and removes the foreign matter in the piping, and the piping has an inner section of a circular section, and the compound has a nearly circular outer section.
  • the inserting jig comprises:
  • the inserting jig has a nearly circular shape.
  • Fig. 27 (a) is a sectional structural diagram of the compound and inserting jig used in exemplary embodiment 35
  • Fig. 27 (b) is a perspective view of the inserting jig.
  • the inner section of the piping 6 has a circular shape.
  • the inserting jig 40 has a cylindrical shape.
  • the compound 7 is columnar cylinder. First of all, the compound 7 is set in the inserting jig 40. The leading end of the inserting jig 40 containing the compound is inserted into the inlet of the piping 6. While maintaining this state, only the compound is pushed out into the piping by finger or pushing bar or other means until the compound 7 is completely inserted into the piping 6. After the compound 47 is inserted into the piping 6, the inserting jig 40 is removed from the piping 6.
  • a pressure-proof hose 9 is connected to the piping. Nitrogen pressure generated from a nitrogen cylinder 8 is passed into the pressure-proof hose 9. By this pressure, the compound 7 moves in the piping 6. The compound moves while removing the foreign matter in the piping, and the foreign matter in the piping is discharged together with the compound. Thus, the foreign matter in the piping is cleaned.
  • the compound can be securely inserted into the piping without deforming the shape of the compound.
  • the first opening has a smaller aperture than the second opening.
  • Fig. 28 (a) is a sectional structural diagram of the compound and inserting jig used in exemplary embodiment 36
  • Fig. 28 (b) is a perspective view of the inserting jig.
  • the inner section of the piping 6 has a circular shape.
  • the inserting jig 42 has a hollow conical shape, and its both ends have openings.
  • a first opening 41a at one end of the inserting jig 42 has a smaller outside diameter than the inside diameter of the piping 6, and a second opening 42b at other end has a larger outside diameter than the inside diameter of the piping 6. That is, the inserting jig 42 has a tapered cylindrical shape.
  • the compound 7 is set in the inserting jig 42 through the second opening 42b.
  • the leading end of the first opening 42a of the inserting jig 42 containing the compound 7 is inserted into the inlet of the piping 6. While maintaining this state, only the compound is pushed out into the piping by finger or pushing bar or other means until the compound 7 is completely inserted into the piping 6.
  • the inserting jig 42 is removed from the piping 6.
  • the first opening 42a of the inserting jig 42 is inserted into the piping 6.
  • the compound 7 is set into the inserting jig 42 from the second opening 42b. Further, the compound 7 is pushed completely into the piping 6.
  • only the inserting jig 42 is removed from the piping.
  • the foreign matter in the piping is removed in the same manner as in embodiment 35.
  • the diameter of the leading end (first opening) of the cylindrical inserting jig is smaller than the diameter of the rear end (second opening) for inserting the compound, the compound can be easily inserted into the piping.
  • the piping has a flare nut
  • the first opening has a joint to be connected to the flare nut
  • the second opening has a cylindrical shape
  • Fig. 29 (a) is a sectional structural diagram of the compound and inserting jig used in exemplary embodiment 37
  • Fig. 29 (b) is a perspective view of the inserting jig.
  • the inner section of the piping 6 has a circular shape.
  • a flare nut 44 is connected to the opening of the piping 6.
  • An inserting jig 43 is a cylindrical structure having a flare joint 43a.
  • the flare joint 43a can be engaged with the flare nut 44.
  • the leading end of the inserting jig 43 can be engaged with the opening of the piping 6.
  • the compound 7 is set in the inserting jig 43.
  • the flare joint 43a of the inserting jig 43 containing the compound is engaged with the flare nut 44.
  • the flare nut 44 coupled with the inserting jig 43 is connected to the piping 6.
  • first the flare nut 44 is connected to the piping 6.
  • the flare joint 43a of the inserting jig 43 is engaged with the flare nut 44.
  • the compound 7 is then inserted into the inserting jig 43.
  • the compound 7 is set in the inserting jig 43.
  • the flare nut 44 is connected to the piping 6.
  • the piping has a flare nut
  • the first opening has a joint to be connected to the flare nut
  • the second opening has a conical shape
  • the joint and the conical portion are formed integrally.
  • Fig. 30 (a) is a sectional structural diagram of the compound and inserting jig used in exemplary embodiment 37
  • Fig. 30 (b) is a perspective view of the inserting jig.
  • the inner section of the piping 6 has a circular shape.
  • a flare nut 44 is connected to the opening of the piping 6.
  • An inserting jig 45 is a hollow structure having a flare joint 45a and a conical portion 45b.
  • the conical portion 45b and flare joint 45a are integrally joined, and the conical portion 45b has a larger aperture from the flare joint 45a toward the opening. That is, the inserting jig has a first opening positioned at the flare joint 45a, and a conical second opening.
  • the flare joint 45a can be engaged with the flare nut 44.
  • the flare joint 45a of the inserting jig 45 can be engaged with the flare nut 44.
  • the second opening 42b has a later outside diameter than the inside diameter of the piping 6. That is, the conical portion 45b of the inserting jig 45 has a tapered cylindrical shape.
  • the flare joint 45a of the inserting jig 45 can be engaged with the opening of the piping 6.
  • the compound since the compound is inserted into the piping with the compound held in the inserting jig 45, flare nut 44 or piping, the compound can be inserted into the piping safely and securely.
  • the compound inserting job is extremely easy and the effects are further enhanced.
  • the compound to be conveyed has a stiff property, it is preferred that its outside diameter is about 10% smaller than the inside diameter of the piping. As a result, the piping is hardly damaged. It is therefore preferred to compose the compound of resin or the like.
  • the compound is preferred to have a hardness at least smaller than that of the copper.
  • the compound is preferred to have an outer diameter larger than by about 5% or less than the inside diameter of the piping. It has hence extremely enhanced the effect of scraping the oil sticking to the inner wall of the piping.
  • the ultrafine fibers are fibers having the fiber diameter of 1 denier or less, according to the definition that 1 denier is the length of 1 g weight of fiber being 9000 meters.
  • the denier method fiber diameter is the unit applied to the filament and yarn of cloth, and it is the constant length system expressing the thickness of the yarn by the weight per unit length.
  • the ultrafine fibers have their features in the fineness and shape of fibers.
  • the fiber material is nylon or polyester. Usually, fibers of 1 denier or less are woven in dense state. In this fiber manufacturing method, the fiber are spun in assembled state, and the spun matter is separated later.
  • the manufacturing method of ultrafine fibers applied to the exemplary embodiments is either split type or peeling type.
  • the split type manufacturing method is shown in Fig. 16.
  • one fiber is separated into two components.
  • Each fiber of ultrafine fibers manufactured according to Fig. 16 has a triangular section with a sharp edge. Accordingly, the ultrafine fibers have an excellent wiping (scraping) effect of oil stain, copper powder, iron powder, and other contamination sticking to the inner wall of the piping.
  • the peeling type manufacturing method is shown in Fig. 17. In Fig. 17, one fiber is peeled into a plurality of components.
  • Each fiber of ultrafine fibers manufactured according to the method of Fig. 17 has a flat shape.
  • the fibers having such a flat shape are twisted, and the wiping (scraping) effect of oil stain, copper powder, iron powder and other contamination is outstanding. Once scraped off, the contamination is entrapped in the entangled fibers, and is hardly desorbed again. Therefore, in these exemplary embodiments, the ultrafine fibers have an extremely excellent effect in the application of eliminating the contamination sticking to the inside of the copper piping.
  • the conveying pressure of the compressed gas applied in the exemplary embodiments is preferably about 0.55 kgf/cm 2 to 5 kgf/cm 2 .
  • the conveying pressure of the compressed gas of 2 kgf/cm 2 and 4 kgf/cm 2 is presented. If the pressure was higher than 5 kgf/cm 2 , in exemplary embodiment 1, slipping of the gas on the component to be conveyed tended to be too large. In exemplary embodiments 6 to 8, or 9 to 12, the conveying speed is too fast for deposit scraping or wiping operation by the hair fibers or nonwoven cloth. Accordingly, the oil removal rate tended to decline. In the cold climate in winter, for example, at ambient temperature of 5°C, this tendency was more obvious.
  • the conveying pressure of the compressed gas must be controlled in consideration of the meteorological condition and the properties of the compound to be conveyed.
  • the conveying pressure should be preferably controlled so as to be low when introducing the compound, and higher as the compound is remote from the inlet while advancing through the copper piping.
  • the compressed gas applied in the exemplary embodiments is generally air or nitrogen. These gases are easily available, and by using air or nitrogen, the working efficiency of installation is improved.
  • air or nitrogen passes through a hollow filter of polyamide or the like, a dry air with dew point of -30°C or less can be obtained.
  • the moisture content of the feed gas By limiting the moisture content of the feed gas, the residual moisture at the end of cleaning work of the existing piping can be lowered. That is, by feeding dry gas, the moisture existing inside can is discharged together with the feed gas.
  • the existing piping cleaning method of the exemplary embodiments can be applied when changing from the air conditioner using R410A refrigerant to other air conditioner using the same R410A refrigerant.
  • the exemplary embodiments are also applicable to the air conditioner using ester oil or ether oil as the refrigerating machine oil.
  • the word of "lipophilic” has the same meaning as the word of "oleophilic”.
  • the oil remaining and sticking in the existing piping can be discharged outside of the piping by the excluding volume effect taking place when the compound is conveyed by a compressed gas. Therefore, the existing piping can be used continuously as the piping for a new air conditioner to be installed. Moreover, the new air conditioner using the existing piping has an excellent long-term reliability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning In General (AREA)
EP00124725A 1999-11-16 2000-11-13 Verfahren zur Reinigung einer Rohrleitung, Reinigungslaufteufels zum Gebrauch darin, und Rohrleitungreinigungsvorrichtung Withdrawn EP1102018A1 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP32510299A JP2001141390A (ja) 1999-11-16 1999-11-16 空気調和機の配管清浄方法
JP32510299 1999-11-16
JP2000037848A JP2001227892A (ja) 2000-02-16 2000-02-16 空気調和機の配管清浄用治具及び物品
JP2000037848 2000-02-16
JP2000039567 2000-02-17
JP2000039566 2000-02-17
JP2000039567A JP3733823B2 (ja) 2000-02-17 2000-02-17 空気調和機の配管清浄用物品および方法
JP2000039566A JP3829566B2 (ja) 2000-02-17 2000-02-17 空気調和機の配管清浄方法

Publications (1)

Publication Number Publication Date
EP1102018A1 true EP1102018A1 (de) 2001-05-23

Family

ID=27480346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124725A Withdrawn EP1102018A1 (de) 1999-11-16 2000-11-13 Verfahren zur Reinigung einer Rohrleitung, Reinigungslaufteufels zum Gebrauch darin, und Rohrleitungreinigungsvorrichtung

Country Status (1)

Country Link
EP (1) EP1102018A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1657505A1 (de) * 2004-10-26 2006-05-17 LG Electronics, Inc. Verfahren und System zur Erkennung von Verstopfungen in einem Rohr einer Mehreinheiten-Klimaanlage
WO2007033223A2 (en) * 2005-09-14 2007-03-22 Johnsondiversey, Inc. Cleaning bullet
US7743450B2 (en) 2005-09-14 2010-06-29 Diversey, Inc. Cleaning bullet
KR101600755B1 (ko) 2015-07-10 2016-03-07 김동운 냉매배관 세척장치
CN109974351A (zh) * 2019-04-25 2019-07-05 新昌县长城空调部件股份有限公司 重卡汽车空调用膨胀阀进出铝管总成及其加工工艺
CN113369251A (zh) * 2021-05-18 2021-09-10 邓武石 一种超精密薄壁不锈钢管脱脂清洗装置及清洗方法

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1673890A (en) * 1926-11-18 1928-06-19 Smith Ernest Hope Condenser-tube cleaner
US2906650A (en) * 1956-10-31 1959-09-29 Roll Dippers Inc Method of cleaning pipe lines
US3543323A (en) * 1968-11-20 1970-12-01 Harry J Girard Foamed plastic pig for pipe lines
DE2136148A1 (de) * 1971-07-20 1973-02-01 Georg Schiementz Verfahren zum entrosten und auftragen von farbanstrichen im innern fertig verlegter stahlrohrleitungen
US3725968A (en) * 1971-05-27 1973-04-10 M Knapp Double-dished pipeline pig
JPS5816199A (ja) * 1981-07-22 1983-01-29 Toshiba Corp 熱交換器伝熱管の内面清掃用海綿状球体
US4373225A (en) * 1979-07-06 1983-02-15 Friedrich Wilh. Schwing, Gmbh Piping valve with a housing for the transfer of a wiper insertable in conduits that supply pressurized viscous material, preferably concrete
JPS61175497A (ja) * 1985-01-31 1986-08-07 Ebara Corp チユ−ブ洗浄装置
US4898197A (en) * 1983-03-11 1990-02-06 Lacress Nominees Pty. Ltd. Cleaning of tubes using projectiles
DE4111452A1 (de) * 1991-04-09 1992-10-15 Buehler Gmbh Verfahren und vorrichtung zum reinigen von rohrleitungen
JPH05177178A (ja) * 1991-12-27 1993-07-20 Yokohama Rubber Co Ltd:The 管内清掃用具
US5263220A (en) * 1991-11-22 1993-11-23 Campbell Doug C Pig passage indicator mechanism incorporating a fluid seal construction
JPH08155413A (ja) * 1994-12-02 1996-06-18 Yunipetsuku:Kk ピ グ
US5555585A (en) * 1990-08-10 1996-09-17 Compri Technic Pty., Ltd. Pneumatic gun and projectiles therefor
DE29711840U1 (de) * 1997-07-07 1997-10-30 Förster, Martin, 78234 Engen Vorrichtung zum Reinigen von Schläuchen, Leitungen o.dgl.
EP0828132A2 (de) * 1996-09-10 1998-03-11 Kyokuto Rubber Co., Ltd. Reinigungsanlage für Wärmetauscher und Verfahren zur Reinigung eines Wärmetauschers
EP0952407A2 (de) * 1998-04-24 1999-10-27 Mitsubishi Denki Kabushiki Kaisha Kühlkreisvorrichtung, Verfahren zu deren Herstellung und Verfahren zu deren Betrieb

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1673890A (en) * 1926-11-18 1928-06-19 Smith Ernest Hope Condenser-tube cleaner
US2906650A (en) * 1956-10-31 1959-09-29 Roll Dippers Inc Method of cleaning pipe lines
US3543323A (en) * 1968-11-20 1970-12-01 Harry J Girard Foamed plastic pig for pipe lines
US3725968A (en) * 1971-05-27 1973-04-10 M Knapp Double-dished pipeline pig
DE2136148A1 (de) * 1971-07-20 1973-02-01 Georg Schiementz Verfahren zum entrosten und auftragen von farbanstrichen im innern fertig verlegter stahlrohrleitungen
US4373225A (en) * 1979-07-06 1983-02-15 Friedrich Wilh. Schwing, Gmbh Piping valve with a housing for the transfer of a wiper insertable in conduits that supply pressurized viscous material, preferably concrete
JPS5816199A (ja) * 1981-07-22 1983-01-29 Toshiba Corp 熱交換器伝熱管の内面清掃用海綿状球体
US4898197A (en) * 1983-03-11 1990-02-06 Lacress Nominees Pty. Ltd. Cleaning of tubes using projectiles
JPS61175497A (ja) * 1985-01-31 1986-08-07 Ebara Corp チユ−ブ洗浄装置
US5555585A (en) * 1990-08-10 1996-09-17 Compri Technic Pty., Ltd. Pneumatic gun and projectiles therefor
DE4111452A1 (de) * 1991-04-09 1992-10-15 Buehler Gmbh Verfahren und vorrichtung zum reinigen von rohrleitungen
US5263220A (en) * 1991-11-22 1993-11-23 Campbell Doug C Pig passage indicator mechanism incorporating a fluid seal construction
JPH05177178A (ja) * 1991-12-27 1993-07-20 Yokohama Rubber Co Ltd:The 管内清掃用具
JPH08155413A (ja) * 1994-12-02 1996-06-18 Yunipetsuku:Kk ピ グ
EP0828132A2 (de) * 1996-09-10 1998-03-11 Kyokuto Rubber Co., Ltd. Reinigungsanlage für Wärmetauscher und Verfahren zur Reinigung eines Wärmetauschers
DE29711840U1 (de) * 1997-07-07 1997-10-30 Förster, Martin, 78234 Engen Vorrichtung zum Reinigen von Schläuchen, Leitungen o.dgl.
EP0952407A2 (de) * 1998-04-24 1999-10-27 Mitsubishi Denki Kabushiki Kaisha Kühlkreisvorrichtung, Verfahren zu deren Herstellung und Verfahren zu deren Betrieb

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 092 (M - 208) 16 April 1983 (1983-04-16) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 385 (M - 548) 24 December 1986 (1986-12-24) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 591 (C - 1125) 28 October 1993 (1993-10-28) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 10 31 October 1996 (1996-10-31) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1657505A1 (de) * 2004-10-26 2006-05-17 LG Electronics, Inc. Verfahren und System zur Erkennung von Verstopfungen in einem Rohr einer Mehreinheiten-Klimaanlage
US7823397B2 (en) 2004-10-26 2010-11-02 Lg Electronics Inc. System and method for detecting clogged state of pipe of heat pump type multi-air conditioner
CN101583440A (zh) * 2005-09-14 2009-11-18 约翰逊迪瓦西公司 清洁锥形体
WO2007033223A3 (en) * 2005-09-14 2008-10-16 Johnson Diversey Inc Cleaning bullet
US7743450B2 (en) 2005-09-14 2010-06-29 Diversey, Inc. Cleaning bullet
US7752700B2 (en) 2005-09-14 2010-07-13 Diversey, Inc. Cleaning bullet
WO2007033223A2 (en) * 2005-09-14 2007-03-22 Johnsondiversey, Inc. Cleaning bullet
AU2006290998B2 (en) * 2005-09-14 2011-06-16 Diversey, Inc. Cleaning bullet
CN101583440B (zh) * 2005-09-14 2012-11-21 迪瓦西公司 清洁锥形体
KR101600755B1 (ko) 2015-07-10 2016-03-07 김동운 냉매배관 세척장치
CN109974351A (zh) * 2019-04-25 2019-07-05 新昌县长城空调部件股份有限公司 重卡汽车空调用膨胀阀进出铝管总成及其加工工艺
CN109974351B (zh) * 2019-04-25 2023-08-08 新昌县长城空调部件股份有限公司 重卡汽车空调用膨胀阀进出铝管总成及其加工工艺
CN113369251A (zh) * 2021-05-18 2021-09-10 邓武石 一种超精密薄壁不锈钢管脱脂清洗装置及清洗方法

Similar Documents

Publication Publication Date Title
US8359996B2 (en) System and method for coating tubes
EP1102018A1 (de) Verfahren zur Reinigung einer Rohrleitung, Reinigungslaufteufels zum Gebrauch darin, und Rohrleitungreinigungsvorrichtung
RU2652217C2 (ru) Коалесцирующий фильтр
JPH10505285A (ja) パイプの修理方法
CA2650817C (en) Method of cleaning heater tubes with a pig
US4356090A (en) Flow-through oil/water separation filter
CN114007001B (zh) 基于发电运行管理***的设备运行监视方法及其装置
BG100535A (bg) Метод за възстановяване на тръбопроводи
US6470691B1 (en) Fluid transport
JP3870643B2 (ja) 空気調和機の配管清浄用物品
JP2001141390A (ja) 空気調和機の配管清浄方法
JP3829566B2 (ja) 空気調和機の配管清浄方法
US20040083565A1 (en) System for cleaning tubes of heat exchangers and cleaning bodies therefor
JP2001174193A (ja) 空気調和機の配管清浄用物品
KR101999391B1 (ko) 냉매배관 세정장치 및 이를 이용한 냉매배관 세정방법
US5737929A (en) Method and means for separating oil and impurities from a refrigerant in an air conditioning system
EP0661503A2 (de) Befeuchter
KR101600755B1 (ko) 냉매배관 세척장치
US7707839B2 (en) Declogging device and declogging method
CN2284895Y (zh) 三合一弹簧软管
JPH1123188A (ja) 蓄熱システム用循環管
JP2001227896A (ja) 空気調和機の配管清浄方法
CN117102092A (zh) 一种结霜箱观测窗除霜装置
KR100401084B1 (ko) 축열식 공기조화기
EP1067340A2 (de) Falle für die Sammlung von Austauschungsgas in einer Klimaanlage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): ES GR IT

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20010622

AKX Designation fees paid

Free format text: ES GR IT

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

17Q First examination report despatched

Effective date: 20030521

17Q First examination report despatched

Effective date: 20030521

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20070329