WO2000028212A1 - Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens - Google Patents
Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens Download PDFInfo
- Publication number
- WO2000028212A1 WO2000028212A1 PCT/EP1999/008082 EP9908082W WO0028212A1 WO 2000028212 A1 WO2000028212 A1 WO 2000028212A1 EP 9908082 W EP9908082 W EP 9908082W WO 0028212 A1 WO0028212 A1 WO 0028212A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- conveying
- delivery
- ventilation
- conveying device
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
- F04B39/062—Cooling by injecting a liquid in the gas to be compressed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
- F04B37/20—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids for wet gases, e.g. wet air
Definitions
- the invention relates to a method for conveying moist gases by means of a conveying device which has at least one conveying pump with a displacer oscillating in a conveying space.
- the invention also relates to a conveying device for conveying moist gases, in particular for carrying out the method mentioned at the beginning, with at least one conveying pump which has a displacer which oscillates in a conveying chamber, the conveying chamber having an inlet with at least one suction valve and an outlet with at least one Has exhaust valve.
- Medical instruments and other medical items are sterilized in autoclaves that have an airtight lockable sterilization chamber.
- the instruments in the sterilization chamber are first exposed to a so-called fractional pre-vacuum, in which repeated evacuation of the air alternating with the periodic inflow of steam results in particularly good air removal even from narrow-bore instruments.
- the instruments in the sterilization chamber are exposed to hot steam under excess pressure.
- a so-called post-vacuum is then again generated in the sterilization chamber, which is intended to shorten the drying time of the items to be sterilized and to optimize the drying process.
- the sterilization chamber of such previously known steam sterilization devices is connected to a conveyor device which has a vacuum pump. So far, because of the application of water vapor to the vacuum pump only water ring pumps or diaphragm pumps are used. Because of the size and the disadvantages of a water ring pump, in the smaller steam sterilization devices provided for example in the doctor's office, only membrane pumps are usually suitable.
- the pump heads In order to achieve evaporation of the water droplets and to ensure the trouble-free operation of the known conveying devices, the pump heads, in particular of the membrane pumps used in steam sterilization devices, are heated to approximately 100 ° C. With the evaporation of the liquid contained in the conveying gas, however, a considerable increase in volume of the conveying medium is connected, which leads to an increase in the evacuation time. In addition, hot pump heads have a negative impact on the service life of the membranes, valves, bearings and other components used. These negative effects are exacerbated by the already high level
- the heating cartridges required to heat the pump heads are relatively expensive, because in addition to these heating cartridges, a control device with a temperature sensor must always be used to regulate the vaporization temperature, and because these heating cartridges are usually used require at least as much electrical power as the drive motor of the associated feed pump.
- the solution to this problem according to the invention consists in particular in the method of the type mentioned at the outset that the delivery chamber of at least one feed pump is ventilated once or several times during operation of the delivery device, regardless of the stroke position of the displacer oscillating in the delivery chamber.
- a device which is designed as a combination of a suction pump and a compressor.
- the known device works as a suction pump on the downward stroke of the piston and serves as a compressor on the upward stroke.
- the piston opens valve openings provided on the cylinder circumference during the downstroke so that additional air can flow into the displacement from outside under atmospheric pressure and can be compressed in the subsequent upstroke because the air sucked in via the inlet valve may not be sufficient for compression alone.
- the device known from US-A-2 812 893 has compression spring-loaded inlet and outlet valves which open temporarily at a defined pressure difference. If the outlet valve of the known device opens, for example, at an overpressure of 10 bar, the amount of air compressed during the upward stroke and exceeding 10 bar is expelled through the outlet valve. In the upper dead space, only those below then remain this pressure limit is the amount of air. Since this harmful air volume still has a gas pressure of 10 bar, it would normally push the piston downwards in such a way that the previously known device cannot take over the function of a suction pump during the downward stroke.
- the known device therefore has a vent valve in its pump head, which is opened at the top dead center by means of an actuating rod arranged on the piston. The vent valve used in the known device is therefore actuated cyclically and as a function of the stroke position of the piston.
- the delivery chamber of at least one delivery pump is intermittently ventilated once or several times, regardless of the stroke position of the displacer. Any liquid droplets remaining in the delivery chamber are blown out of the delivery device.
- the pumping chamber can be vented once or several times during operation of the pump, for example after certain condensation times or at different pressure levels in a chamber to be evacuated by the pumping device. Since the method according to the invention enables rapid and targeted pump drying, the moisture contained in the pumped medium can condense, the pumping chamber can be cooled and, accordingly, energy-consuming heating of the pump head can be dispensed with.
- a preferred further development according to the invention provides that the feed pump is cooled in the area of its delivery space below the evaporation or boiling temperature present at the given evacuation pressure.
- the volume of the originally vaporous conveying medium is simultaneously reduced to a fraction of the original volume during the condensation.
- This volume reduction in the area of the conveying device creates a condensation pump effect, which increases the conveying capacity of the Conveyor determines or at least supports. Since the feed pump is cooled below the evaporation or boiling temperature available at the given evacuation pressure, re-evaporation of the already condensed delivery medium in the area of the feed pump is definitely ruled out.
- the feed pump Since in a steam sterilization device in particular the water vapor contained in the pumped medium is cooled and converted into its liquid state, the feed pump only has to pump out a smaller volume of the pumped medium, which significantly shortens the pump operating time required.
- the cooling of the feed pump required to cool the delivery medium in the area of the delivery space also causes the delivery device to run coolly, which favors a long service life of the delivery pump and long service intervals.
- the solution according to the invention in the conveying device of the type mentioned in the introduction consists in particular in that at least one conveying pump has a ventilation device with an aeration channel which opens into the region of the conveying space, and that in the
- a ventilation valve is interposed, which can be actuated as required and independently of the stroke position of the displacer.
- the ventilation valve is designed as a manually operable valve.
- the ventilation valve is in control connection with a control device, and that the control device has a timing element and / or a pressure sensor for the one-time or repeated intermittent actuation of the ventilation valve depending on the condensation time intervals and / or depending predetermined pressure levels in a chamber to be evacuated by the conveyor.
- a preferred embodiment according to the invention provides that the feed space is connected to the suction valve via a suction channel and that the ventilation channel in the suction channel is preferably directly in the area of the suction valve flows.
- the suction and / or outlet valves of the feed pump having the ventilation device can be actuated as usual depending on the pressure prevailing in the feed chamber, the suction valve of the feed pump is suddenly closed when the ventilation valve is opened and when the feed chamber is ventilated, which at the same time also as Check valve acts against the chamber to be evacuated by the fluid. It is thereby achieved that when the ventilation valve is actuated in the feed pump, a targeted flow is built up with a sufficiently high flow rate to entrain the liquid droplets which have hitherto remained in the feed chamber.
- the ventilation or drying gas can only take one direction and flow from the pump inlet side directly through the delivery chamber to the pump outlet side. This measure favors effective pump drying.
- the delivery pump having the ventilation device forms the first pump stage of the multi-stage delivery device. It is advantageous if the pump stages of the conveying device are connected via a flow channel, the channel cross section of which is selected such that the flow force is greater than the adhesive force and in particular that an atmospheric volume flow of the conveying device has an average flow velocity greater than 10 m / sec. generated. This flow velocity generates a frictional force at the boundary layer between ventilation gas and adhesive liquid which is greater than the adhesive force between the liquid and the flow surfaces provided in the delivery chamber. This ensures that the liquid droplets remaining in the delivery chamber detach from the flow surfaces of the delivery chamber and are entrained with the ventilation or drying gas.
- the drying of the delivery chamber is additionally supported if the delivery device has low-adhesion and especially non-metallic flow surfaces, at least in some areas, preferably at least in the area of the pump head of the delivery pump (s), which have very low adhesive binding forces to liquids. It can be particularly advantageous if the delivery device has low-adhesion and especially non-metallic flow surfaces, at least in some areas, preferably at least in the area of the pump head of the delivery pump (s), which have very low adhesive binding forces to liquids. It can be particularly advantageous if the
- Flow surfaces of the conveyor device have a plastic coating, preferably a Teflon coating, at least in a partial section.
- the pump head of the delivery pump (s) is preferably designed as a die-cast part, at least in the region of an end cover, with molded-in blind-hole-free flow channels. Since in this pump design the flow channels are molded into the pump head designed as a die-cast part, the pockets and blind holes that could not previously be avoided when drilling out the flow channels and in which the liquid could otherwise collect are avoided. According to a further development according to the invention of its own worthy of protection, it is provided that the pump head of the feed pump (s) is forcibly cooled and that on the outside of the pump head of the feed pump (s) preferably cooling fins are provided for forced air cooling.
- the head temperature can also be cooled below the evaporation or boiling temperature present at the given evacuation pressure. This further development according to the invention ensures that the water vapor contained in the pumped medium condenses and can no longer evaporate again. A re-evaporation of the condensate would result in an undesirable increase in the volume of the pumped medium and a corresponding extension of the required operating times of the conveyor.
- a preferred embodiment according to the invention provides that an intermediate cover or an intermediate plate is arranged between the pump head and a crankcase of the feed pump (s), in which the flow channels provided between the feed chamber and the valves are provided and that the intermediate cover is designed as a plastic part .
- the intermediate cover can be produced, for example, as an injection molded part from a plastic.
- Such a plastic part and in particular a plastic injection molded part has a very smooth, water-repellent surface, as a result of which the adhesive effect can be further reduced.
- the intermediate cover made of plastic forms a poor heat conductor, which forms an effective thermal insulation between the hot pump head and the pump housing. Because the intermediate cover made of plastic compared to, for example Pump head made of aluminum remains relatively cool, condensation of the moisture contained in the pumped medium and rapid removal of the moisture droplets in the region of this intermediate cover is promoted. In addition, an intermediate cover made of plastic and in particular as a plastic injection molded part can be produced very inexpensively.
- a preferred embodiment according to the invention provides that the feed pump (s) of the feed device, in particular the feed pump having the ventilation device, is designed as a reciprocating piston pump or preferably as a diaphragm pump.
- the conveying device has a flow guide with at least one tubular channel section
- an optimization of the flow guide can be achieved if this channel section is connected at the end to an adjacent partial area of the flow guide essentially without a joint by means of a sealing ring made of elastic material. In this way, joints and other dead spaces in which the condensate could otherwise accumulate are also avoided in this area of the flow guidance.
- FIG. 1 shows a feed pump designed as a diaphragm pump with a ventilation device, the ventilation channel of which opens in the region of the delivery chamber of the pump, and
- FIG. 2 shows a two-stage conveyor device, the two delivery pumps pen, of which the first pump stage has a ventilation device.
- a feed pump is shown in a longitudinal section, which is designed here as a diaphragm pump 2.
- the diaphragm pump 2 has a thin elastic and used as a displacer shaped diaphragm 3, which is firmly clamped on its periphery between a pump head 4 and a pump housing 5.
- the pump head 4 of the diaphragm pump 2 is essentially of two parts and has an intermediate cover 8 and an end cover 9.
- an inlet 10 with a suction valve 11 and an outlet 12 with an outlet valve 13 are provided in the pump head 4 of the diaphragm pump 2.
- the suction valve 11 and the outlet valve 13 of the feed pump 2 can be actuated as a function of the pressure prevailing in the feed chamber 7.
- the valves 11, 13 have a valve body 14 which is designed as a valve disk consisting of an elastomer. These valve disks can also be tongue-shaped or round, for example.
- the diaphragm pump 2 is part of an otherwise not shown conveyor 1, which serves to convey moist gases.
- conveyors are used, for example, to evacuate steam sterilization devices (so-called autoclaves) or in the area of gas drying.
- the pump head 4 is Feed pump 2 forced-cooled.
- the pump head 4 can have, for example, water cooling, the cooling channels of which are arranged very close and parallel to the gas flow channels located in the pump head.
- the pump head 4 has cooling fins for forced air cooling in addition to or instead of water cooling, in particular on its end cover 9.
- the feed pump 2 is forced-cooled in such a way that it is cooled in the area of its pump head below the existing evaporation or boiling temperature of the liquid contained in the gaseous delivery medium, which corresponds to the desired evacuation pressure in the chamber to be evacuated.
- the volume of the originally vaporous conveying medium is simultaneously reduced to a fraction of the original volume during the condensation. This volume reduction in the area of the conveying device creates a condensation pump effect which supports the conveying capacity of the conveying device 1.
- the delivery pump Since the water vapor contained in the delivery medium is cooled in the area of the delivery pump 2 and converted into its liquid state, the delivery pump has to pump out only a smaller volume of the delivery medium, which significantly shortens the pump operating time required.
- the cooling of the feed pump 2 required for cooling the delivery medium in the area of the delivery space 7 also causes the delivery device 1 to run coolly, which favors a long service life of the delivery pump and long service intervals.
- the feed chamber 7 is ventilated intermittently during the operation of the feed pump 2.
- the time intervals can be controlled depending on the pressure levels reached in the (steam sterilization) chamber to be evacuated and / or the condensation times.
- the diaphragm pump 2 has a ventilation device 15 with a ventilation channel 16, which opens in the region of the delivery chamber.
- the control device has a timer or similar timer.
- the control device can also be connected to a pressure sensor, for example located in the steam sterilization chamber of an autoclave, if the ventilation valve 17 is to be actuated as a function of predetermined pressure levels in the chamber to be evacuated. Due to the intermittent ventilation of the delivery chamber 7, any liquid droplets remaining in the delivery chamber 7 are blown out of the delivery device 1.
- the pumping chamber 7 can be vented several times during the operation of the pump 2, for example after certain condensation times or pressure levels. Since rapid and targeted pump drying can be achieved by means of the ventilation device 15, the moisture contained in the pumped medium can condense, the pumping chamber can be cooled and, accordingly, energy-consuming heating of the pump head 4 can be dispensed with.
- the delivery chamber 7 is connected to the suction valve 11 via a suction channel 18.
- the ventilation duct 16 of the ventilation device 15 opens in the flow direction of the pump inlets 10 immediately behind the suction valve 11 in the suction channel 18.
- the suction valve 11 of the diaphragm pump 2 closes abruptly.
- the ventilation or drying gas can therefore only take one direction and flow from the pump inlet side via the delivery chamber 7 to the pump outlet side.
- the actuation of the ventilation device 15 has the effect that a targeted flow with a very high flow velocity is built up in the feed pump 2, which flow in the delivery space
- the liquid contained in the gaseous conveying medium is specifically conveyed out of the delivery pump 2 by clocking the ventilation device 15 one or more times. If the conveying device 1 is used, for example, to evacuate the steam sterilization chamber of an autoclave or a vacuum drying cabinet, the evacuation time can be significantly shortened with the aid of the ventilation device 15 and the final vacuum can be improved.
- the ventilation valve 17, which can also be designed as a manually operable valve, is designed here as an electromagnetic valve and is integrated directly into the intermediate cover 8.
- This intermediate cover 8 is designed as a plastic injection molded part, which is characterized by a very smooth, liquid-repellent surface.
- the end cover 9 is therefore preferably made of aluminum as a die-cast part.
- the gas flow channels provided for the pumped medium are molded into this aluminum die-cast part without blind holes. This largely avoids pockets and other dead spaces which would otherwise arise when such channels were subsequently drilled out and in which the liquid can accumulate.
- the pump head 4 also has non-metallic flow surfaces in the region of its end cover 9. These flow surfaces are formed in the area of the end cover 9, which is designed as an aluminum die-cast part, by a plastic coating, in particular a Teflon coating.
- the feed pump 2 shown in FIG. 1 can also be part of a multi-stage feed device 100.
- the membrane pump 2 having the ventilation device 15 is provided as the first pump stage, the pump outlet 12 of which is connected via a tubular channel section 19 to the pump inlet 10 of the membrane pump 2'.
- This channel section 19 is held with its ends in connection openings 20 of the pumps 2, 2 ', these ends of the channel section 19 each being connected to the adjacent partial area of the flow guide by means of a sealing ring 21 without joints and transitions.
- the channel cross section of the flow channel is chosen to be so small that an atmospheric volume flow of the delivery pump 2 equipped with the ventilation device 15 has an average flow rate greater than 10 m / sec. generated.
- the pump heads 4 of the delivery pumps 2, 2 ' are cooled in such a way that the moisture contained in the gaseous delivery medium can condense. The condensation is accomplished by 'a, for example, as an air and / or water cooling formed Zwangskühlungder pump heads. 4 Due to flow-optimized and coated flow guides, the condensate in the conveying devices 1, 100 is transported without liability.
- the condensation leads to a drastic reduction in volume, which means that quick pumping times and high pumping rates can be achieved.
- a quick and targeted drying of the feed devices 1, 100 can be achieved, whereby a shortening of the evacuation time is further favored and the achievable final vacuum can be significantly reduced.
- the ventilation channel 16 of the ventilation device 15 opens into the delivery chamber 7 of the delivery pump 2, the suction valve 11, which operates depending on the pressure prevailing in the delivery room, can also act as a non-return valve, as a result of which the delivery devices 1, 100 are dried in a targeted manner.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000581364A JP2002529656A (ja) | 1998-11-10 | 1999-10-26 | 搬送装置によって湿ったガスを搬送するための方法及び、この方法を実施するための搬送装置 |
EP99953937A EP1131558B1 (de) | 1998-11-10 | 1999-10-26 | Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens |
DE59902298T DE59902298D1 (de) | 1998-11-10 | 1999-10-26 | Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens |
AT99953937T ATE221961T1 (de) | 1998-11-10 | 1999-10-26 | Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens |
US09/831,443 US6595758B1 (en) | 1998-11-10 | 1999-11-26 | Method for conveying damp gases by means of a conveyor device and a conveyor device for carrying out said method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19851680.0 | 1998-11-10 | ||
DE19851680A DE19851680C2 (de) | 1998-11-10 | 1998-11-10 | Verfahren zum Fördern feuchter Gase mittels einer Fördereinrichtung sowie Fördereinrichtung zum Durchführen dieses Verfahrens |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000028212A1 true WO2000028212A1 (de) | 2000-05-18 |
Family
ID=7887227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/008082 WO2000028212A1 (de) | 1998-11-10 | 1999-10-26 | Verfahren zum fördern feuchter gase mittels einer fördereinrichtung sowie fördereinrichtung zum durchführen dieses verfahrens |
Country Status (8)
Country | Link |
---|---|
US (1) | US6595758B1 (de) |
EP (1) | EP1131558B1 (de) |
JP (1) | JP2002529656A (de) |
KR (1) | KR100613473B1 (de) |
AT (1) | ATE221961T1 (de) |
DE (2) | DE19851680C2 (de) |
TW (1) | TW482870B (de) |
WO (1) | WO2000028212A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10021454C2 (de) | 2000-05-03 | 2002-03-14 | Knf Neuberger Gmbh | Vorrichtung zum Fördern feuchter Gase |
DE10158723B4 (de) * | 2001-11-30 | 2004-09-02 | Ilmvac Gmbh | Vakuumpumpe mit Membranschutz |
DE10255792C5 (de) * | 2002-11-28 | 2008-12-18 | Vacuubrand Gmbh + Co Kg | Verfahren zur Steuerung einer Vakuumpumpe sowie Vakuumpumpensystem |
US20080063551A1 (en) * | 2006-09-13 | 2008-03-13 | R. Conrader Company | Head Discharging Compressor System |
DE102009043644B4 (de) | 2009-09-29 | 2011-07-07 | KNF Neuberger GmbH, 79112 | Mehrstufige Membran-Saugpumpe |
DE202009013127U1 (de) | 2009-09-29 | 2011-02-17 | Knf Neuberger Gmbh | Mehrstufige Membran-Saugpumpe |
DE102013213257A1 (de) * | 2013-07-05 | 2015-01-08 | Pfeiffer Vacuum Gmbh | Membranvakuumpumpe |
US10385836B2 (en) * | 2015-07-14 | 2019-08-20 | Panasonic Intellectual Property Management Co., Ltd. | Reciprocating compressor and hydrogen supply system |
CN105114283B (zh) * | 2015-07-21 | 2018-05-01 | 石家庄佳信汽车制动系统有限公司 | 直线对置活塞式电动真空泵 |
US11873802B2 (en) | 2020-05-18 | 2024-01-16 | Graco Minnesota Inc. | Pump having multi-stage gas compression |
CN112268082B (zh) * | 2020-11-13 | 2022-05-17 | 山东交通学院 | 一种活塞往复式液力缓速器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5815777A (ja) * | 1981-07-21 | 1983-01-29 | Toshiba Corp | 往復動式圧縮機のインジエクシヨン装置 |
DE29514009U1 (de) * | 1995-08-31 | 1995-11-09 | Hyco Vakuumtechnik Gmbh | Vakuumpumpe |
WO1996041106A1 (en) * | 1995-06-07 | 1996-12-19 | Altech Controls Corporation | Liquid compressor cooling |
DE29618911U1 (de) * | 1996-10-30 | 1996-12-19 | Dekema Dental Keramikoefen Gmb | Pumpenanordnung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2812893A (en) * | 1954-06-28 | 1957-11-12 | Westinghouse Air Brake Co | Combined air exhauster and compressor |
US5174735A (en) * | 1991-04-16 | 1992-12-29 | Tecumseh Products Company | Low reexpansion valve system |
US5692387A (en) * | 1995-04-28 | 1997-12-02 | Altech Controls Corporation | Liquid cooling of discharge gas |
-
1998
- 1998-11-10 DE DE19851680A patent/DE19851680C2/de not_active Expired - Lifetime
-
1999
- 1999-10-26 WO PCT/EP1999/008082 patent/WO2000028212A1/de active IP Right Grant
- 1999-10-26 KR KR1020017004894A patent/KR100613473B1/ko active IP Right Grant
- 1999-10-26 EP EP99953937A patent/EP1131558B1/de not_active Expired - Lifetime
- 1999-10-26 DE DE59902298T patent/DE59902298D1/de not_active Expired - Lifetime
- 1999-10-26 AT AT99953937T patent/ATE221961T1/de not_active IP Right Cessation
- 1999-10-26 JP JP2000581364A patent/JP2002529656A/ja active Pending
- 1999-11-03 TW TW088119104A patent/TW482870B/zh active
- 1999-11-26 US US09/831,443 patent/US6595758B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5815777A (ja) * | 1981-07-21 | 1983-01-29 | Toshiba Corp | 往復動式圧縮機のインジエクシヨン装置 |
WO1996041106A1 (en) * | 1995-06-07 | 1996-12-19 | Altech Controls Corporation | Liquid compressor cooling |
DE29514009U1 (de) * | 1995-08-31 | 1995-11-09 | Hyco Vakuumtechnik Gmbh | Vakuumpumpe |
DE29618911U1 (de) * | 1996-10-30 | 1996-12-19 | Dekema Dental Keramikoefen Gmb | Pumpenanordnung |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 092 (M - 208) 16 April 1983 (1983-04-16) * |
Also Published As
Publication number | Publication date |
---|---|
TW482870B (en) | 2002-04-11 |
KR20010080240A (ko) | 2001-08-22 |
DE59902298D1 (de) | 2002-09-12 |
KR100613473B1 (ko) | 2006-08-18 |
EP1131558B1 (de) | 2002-08-07 |
US6595758B1 (en) | 2003-07-22 |
ATE221961T1 (de) | 2002-08-15 |
EP1131558A1 (de) | 2001-09-12 |
DE19851680A1 (de) | 2000-05-18 |
DE19851680C2 (de) | 2003-04-10 |
JP2002529656A (ja) | 2002-09-10 |
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