EP1072796B1 - Verfahren zum Betreiben eines Schraubenverdichters - Google Patents
Verfahren zum Betreiben eines Schraubenverdichters Download PDFInfo
- Publication number
- EP1072796B1 EP1072796B1 EP00115787A EP00115787A EP1072796B1 EP 1072796 B1 EP1072796 B1 EP 1072796B1 EP 00115787 A EP00115787 A EP 00115787A EP 00115787 A EP00115787 A EP 00115787A EP 1072796 B1 EP1072796 B1 EP 1072796B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- return flow
- activated
- flow opening
- minimum
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 26
- 230000008569 process Effects 0.000 title description 3
- 238000010992 reflux Methods 0.000 description 25
- 238000012544 monitoring process Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
- F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
- F04C28/125—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves with sliding valves controlled by the use of fluid other than the working fluid
Definitions
- the invention relates to a method for operating a screw compressor comprising a housing having a rotor chamber, two in the rotor chamber arranged screw rotors, which in the housing about their respective Rotary axes are rotatably mounted and which meshing drivable together are to a medium to be compressed from a suction gas inlet of Encourage housing to a compressed gas outlet of the housing and to compress, one in the direction of the rotor axes movable and to the Rotor chamber adjoining slider for power control over the whoscious Length of the screw rotor, an adjusting device comprising a cylinder pressurized by a medium formed by a cylinder chamber and a piston coupled to the spool, one in the cylinder chamber provided and a minimum position defining reflux opening, at least one provided in the cylinder chamber and at least an intermediate position defining intermediate return flow, wherein according to the process in a stage control mode, either the reflux port is opened to the piston from any position between a maximum position and the minimum position to go back to
- another embodiment shows a combination of the mode of operation, in which only by opening and closing valves Switching from a stepped control mode to the stepless control mode which can be done in the context of the tiered and the stepless control mode described lines and valves combined are.
- the invention is therefore based on the object, a method of the generic To improve the type so that this constructive as simple as possible Construction works reliably.
- This object is according to the invention in a method of the type described above solved in that in a continuously variable control mode for infinitely variable control of the piston positions in a sub-control range between the intermediate position and the minimum position, the reflux opening is activated and for stepless control of piston positions outside of the sub-control range between the intermediate position and the minimum position the corresponding intermediate reflux opening is activated, and to hold a desired position of the piston, the inlet valve and the return flow and the embschflußö réelle be closed.
- the solution according to the invention is with a single intermediate reflux opening fully functional.
- a particularly advantageous control mode provides that the piston thereby exclusively outside the sub-control area between the intermediate position and the minimum position lying sub-control areas is operated, that only the corresponding intermediate return is activated and not
- the reflux is activated, so that already by design the possibility exists, the undesirable part of the control area, for example the lying between the intermediate position and the minimum position Partial tax area, exclude.
- the position of the piston is recognizable. For this reason, it is preferable provided that the position of the piston, starting from the activated intermediate reflux corresponding intermediate position as Reference position is determined and the method is thus able, starting from this reference position, for example by integrating the Inflow times and reflux times, the position of the piston at least approximately with a precise re-reading of the position of the Piston is always possible when this again to the respective intermediate position has gone back to which then starting again the Position of the piston can be determined.
- each valve could for example be designed so that with these as well a quantity control is possible.
- each valve a only switchable between a flow position and a blocking position switchable valve is and thus has only two switching states.
- the different variants are conceivable. That's the way it would be For example, conceivable to apply the piston on two sides with a medium, wherein the one medium, the force for moving the piston of the Minimum position in the maximum position generated and the other medium the Restoring force for moving the piston back in the direction of the minimum position upon activation of the reflux ports or intermediate reflux ports generated.
- the slide is rigidly connected to the piston.
- the inflow in the fixed clock for a fixed Time duration is activated, with the fixable clock and the definable Duration not over the entire operating hours of the screw compressor must be set to the same values, but accordingly changing circumstances, such as changing operating temperature, new can be adjusted, for example, when applying oil as a medium the piston make an adjustment to the viscosity of the same.
- a clocking of the Inflow and in particular a clocking of the reflux.
- FIG. 1 shows a schematic representation of a method according to the invention suitable screw compressor with a schematic longitudinal section through a Housing same.
- An embodiment of a suitable for the inventive method screw compressor, shown in Fig. 1, includes a designated as a whole with 10 housing, which forms a rotor chamber 12, in which two parallel aligned and intermeshing screw rotors 14 about their respective axes of rotation 16 are rotatably mounted, wherein the bearing of the screw rotor 14 is preferably by both sides of the same arranged stub shaft 18 and 20 in provided in the housing 10 bearings 22 and 24, respectively.
- a suction side of the screw rotor 14 is further arranged Suction gas inlet 26 arranged and a pressure side of the same lying Compressed gas outlet 28, wherein the screw rotor 14 to be compacted Promote medium from the suction inlet 26 to the compressed gas outlet 28 and thereby compacted.
- a slider 30 is provided, which in the housing 10 in a direction 32 parallel to the axis of rotation 16 of Screw rotor 14 is slidably mounted and starting from the compressed gas outlet 28 extends in the direction of the suction gas inlet 26, while with his Slider top 34 adjacent to the screw rotor 14 and with a front slide edge 36 determines the location from which a compression of the to be compacted medium through the two intermeshing screw rotor 14 takes place.
- the slider 30 is fixedly connected to an actuating rod 38, with which via a designated as a whole with 40 actuator of the slide 30 is adjustable in the direction 32.
- the adjusting device 40 comprises a cylinder housing 42, which is a cylinder chamber 44 encloses, in which a piston 46 is movable, fixed to the Actuating rod 38 is connected, wherein the actuating rod 38 preferably a piston rod of the piston 46 forms.
- the piston 46 is also parallel to the direction 32 in the cylinder chamber 44 movable and that of a minimum position Mi, for example a power of the order of 25% of the maximum power of the Compressor corresponds, up to a maximum position Ma, which of the Maximum output of the compressor corresponds, and intermediate positions Z1 and Z2, which are described in detail below be explained.
- the minimum position Mi of the piston corresponds to one minimal enclosed between cylinder chamber 44 and piston 46 Cylinder volume and the position Ma a maximum enclosed between the piston 46 and the cylinder chamber 44 Cylinder volume, while the intermediate positions Z1 and Z2 correspond to cylinder volumes between the minimum cylinder volume and the maximum cylinder volume lie.
- the adjusting device 40 is for adjusting the piston 46 with acted upon by pressurized oil, which, for example by an oil pressure pump 50 or a final pressure of the condensing medium pressurized reservoir on a for the application of the piston required pressure maintained becomes.
- pressurized oil which, for example by an oil pressure pump 50 or a final pressure of the condensing medium pressurized reservoir on a for the application of the piston required pressure maintained becomes.
- the oil pressure pump 50 the oil flows through a Supply line 52 via a throttle 54, for example, formed as a capillary to a supply line 56, which with a reflux opening 58 in the cylinder chamber 44 opens.
- the supply line 56 is further provided with a Return line 60 connected to the suction gas inlet 26 of the Housing 10 leads.
- a return valve 64 For controlling individual positions of the piston 46 in the Cylinder chamber 44 is in the supply line 52 an inlet valve 62 provided and in the return line 60, a return valve 64, both preferably electromagnetic via a controller 66, designated as a whole are controllable.
- Inlet valve 62 opened by the controller 66, wherein the oil pressure pump 50th Oil via the supply line 52, the supply line 56 and the return flow 58 pumped into the cylinder chamber 44 and thus under magnification the cylinder volume, the piston 46 is applied, until the desired position of the piston 46 is reached. Then, the inflow valve 62 closed.
- the slider 30 is preferably in a position in which the compressor power between the minimum value and the maximum value, wherein the minimum position Mi of the piston 46 preferably the position of minimum power of the slider 30 is assigned and the Maximum position Ma of the piston 46, the position of maximum power of Slider 30.
- the return valve 64 is opened by the controller 66, so that oil from the of the cylinder chamber 44 and the piston 46 enclosed cylinder volume can flow off via the return line 60 and preferably to Suction gas inlet 26 flows, so that the piston 46 so long in the direction of Minimum position shifts as long as the return valve 64 from the controller 66 is kept open.
- the return port 58 facing a piston head 68 in a cylinder housing bottom 70 of the cylinder housing 42 arranged.
- intermediate return openings 74 and 76 at different distances from the Minimum position Mi of the piston 46 arranged with Intermediate return lines 78 and 80 are connected, which in turn in the return line 60 between the return valve 64 and the suction gas inlet 26 open.
- Each of the intermediate return lines 78 and 80 is with an intermediate return valve 82 and 84 provided, with which the respective Intermediate return line 78 and 80 is closed.
- the intermediate positions Z1 and Z2 are such that the intermediate position Z1 corresponds to a position of the slide 30, wherein the Screw compressor in a medium power range, that is, for example on the order of 50%.
- the intermediate position Z2 for example, defined so that it corresponds to a position of the slider 30, in which the screw compressor with a power of the order of magnitude from 70% to 80% works.
- the piston 46 or the slider 30 is preferably still with an elastic energy storage, that is, for example, a spring 90, such beaufschlagt that both the piston 46 and the slider 30 the Tendency to reduce the cylinder volume, that is without oil pressure the cylinder volume between piston 46 and cylinder chamber 44 in the minimum position Mi of the piston 46 and thus the position minimum power of the screw compressor.
- an elastic energy storage that is, for example, a spring 90, such beaufschlagt that both the piston 46 and the slider 30 the Tendency to reduce the cylinder volume, that is without oil pressure the cylinder volume between piston 46 and cylinder chamber 44 in the minimum position Mi of the piston 46 and thus the position minimum power of the screw compressor.
- the screw compressor according to the invention can now be as follows in the operate stepless control mode:
- screw compressor in an upper performance range, that is in one Power range above a minimum value of the order of magnitude of 50%.
- the controller 66 operates in the upper power range, that they to the process of the piston 46 in the direction of the maximum position Ma the inlet valve 62 opens and thus via the supply line 52 and the Supply line 54 oil in the piston 46 and the Cylinder chamber 44 enter enclosed cylinder volume to let.
- the method of the piston 46 to the intermediate position Z1 can at solely opening the intermediate return valve 82 fast and with additional opening of the inlet valve 62 carried out slowly, provided by the intermediate return valve 82 more oil flows out than flows through the inlet valve 62.
- control and regulation range for the piston 46 is still on Higher values are limited, so after adjustment of the piston 46 to at least to the intermediate position Z2 the control device 66 only an actuation of the Inlet valve 62 and the intermediate return line 80 associated Intermediate return valve 84, so that the piston 46 at his movement toward the minimum position only the Intermediate position Z2 can reach, for example, in the Magnitude between 70% and 80% of the capacity of the compressor lies, and this intermediate Z2 will - in same as in connection with the intermediate position Z1 described - in such an operation of the Intermediate return valve 84 and holding the return valve 64 and the intermediate return valve 82 in the closed Position due to the constructive arrangement of the intermediate return opening 76 not below, without here one Monitoring the position of the piston 46 is required.
- control device 66 may in the inventive Screw compressors, however, not only in the described stepless control mode work, in which ultimately one Stepless positioning of the piston between the minimum position Wed and the maximum position Ma is possible.
- control device according to the invention also work in a staged control mode, in which only the intermediate position Z1, the intermediate position Z2 and the maximum position Ma next to the minimum position Mi are approachable.
- the inlet valve 62 in a fixed clock for a fixed time interval opened so that the pressurized oil in the through the Piston 46 and the cylinder chamber 44 enclosed cylinder volume entry.
- both the return valve 64 and the intermediate return valves 82 and 84 are closed, then thereby the piston 46 at each supply of the under pressure standing oil moves in the direction of maximum position Ma, so that after one by the time intervals for feeding the Oil's total interval set the maximum position Ma is reached.
- the return valve is also when switching off and before switching 64 open.
- the functioning of the screw compressor according to the invention in the Staged or stepped control mode assumes that always at least as much oil through the respective return valves 64, 82 and 84 drain can flow as via the inlet valve 62.
- the inflowing Oil quantity should be adjusted so that it is always less than via the return valves 64, 82 and 84 when activated same amount of oil returning.
- the clocked operation of the inlet valve 62 creates still the possibility by changing the clock frequency or each open period of the inlet valve 62 the to vary supplied amount of oil, for example, in itself changing oil temperature or changing other Conditions that affect the flow behavior of the oil, especially when flowing through the throttle 54 impact.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
Claims (11)
- Verfahren zum Betreiben eines Schraubenverdichters umfassend ein Gehäuse mit einer Läuferkammer (12), zwei in der Läuferkammer angeordnete Schraubenläufer (14), welche in dem Gehäuse (10) um ihre jeweiligen Drehachsen (16) drehbar gelagert sind und welche miteinander kämmend antreibbar sind, um ein zu verdichtendes Medium von einem Sauggaseinlaß (26) des Gehäuses (10) zu einem Druckgasauslaß (28) des Gehäuses (10) zu fördern und dabei zu verdichten, einen in Richtung der Läuferachsen (16) bewegbaren und an die Läuferkammer (12) angrenzenden Schieber (30) zur Leistungssteuerung über die wirksame Länge der Schraubenläufer (14), eine Stelleinrichtung (40), umfassend einen durch ein Medium druckbeaufschlagten Zylinder, gebildet durch eine Zylinderkammer (44) und einen mit dem Schieber (30) gekoppelten Kolben (46), eine in der Zylinderkammer (44) vorgesehene und eine Minimalstellung (Mi) festlegende Rückflußöffnung (58), mindestens eine in der Zylinderkammer (44) vorgesehene und mindestens eine Zwischenstellung (Z1, Z2) festlegende Zwischenrückflußöffnung (74, 76), wobei gemäß dem Verfahren in einem stufigen Steuermodus entweder die Rückflussöffnung (58) geöffnet wird, um den Kolben (46) aus jeder Stellung zwischen einer Maximalstellung (Ma) und der Minimalstellung (Mi) zur Minimalstellung (Mi) zurückzufahren und/oder mindestens eine Zwischenrückflussöffnung (74, 76) geöffnet wird, um den Kolben (46) bis zu dieser Zwischenstellung (Z1, Z2) zu verfahren, und/oder ein Zulaufventil (62) geöffnet wird, um den Kolben (46) in Richtung einer Maximalstellung (Ma) zu verfahren,
dadurch gekennzeichnet, daß in einem stufenlosen Steuermodus zur stufenlosen Steuerung der Kolbenstellungen in einem Teilsteuerbereich zwischen der Zwischenstellung (Z1, Z2) und der Minimalstellung (Mi) die Rückflußöffnung (58) aktiviert wird und
daß zur stufenlosen Steuerung von Kolbenstellungen außerhalb des Teilsteuerbereichs zwischen der Zwischenstellung (Z1, Z2) und der Minimalstellung (Mi) die entsprechende Zwischenrückflußöffnung (74, 76) aktiviert wird, und
daß zum Halten einer gewünschten Stellung des Kolbens (46) das Zulaufventil (62) und die Rückflußöffnung (58) sowie die Zwischenrückflußöffnung (74, 76) geschlossen werden. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die minimal zulässige Stellung des Kolbens (46) in dem jeweiligen Teilsteuerbereich durch die jeweils aktivierte Zwischenrückflußöffnung (74, 76) von mehreren Zwischenrückflußöffnungen (74, 76) festlegt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kolben (46) dadurch ausschließlich in außerhalb des Teilsteuerbereichs zwischen der Zwischenstellung (Z1, Z2) und der Minimalstellung (Mi) liegenden Teilsteuerbereichen betrieben wird, daß nur die entsprechende Zwischenrückflußöffnung (74, 76) zur Steuerung aktiviert wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Stellung des Kolbens (46) ausgehend von der der aktivierten Zwischenrückflußöffnung (74, 76) entsprechenden Zwischenstellung als Referenzposition ermittelt wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß jede der Rückflußöffnungen und Zwischenrückflußöffnungen (58, 74, 76) durch ein zugeordnetes steuerbares Ventil (64, 82, 84) gesteuert wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das Ventil (64, 82, 84) ein nur zwischen einer Durchflußstellung und einer Sperrstellung geschaltet ist.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Kolben (46) in Richtung seiner Minimalstellung (Mi) durch einen elastischen Kraftspeicher (90) beaufschlagt wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß in dem stufigen Steuermodus bei zeitlich gemittelt ungefähr konstantem Zufluß nur die Rückflußöffnung (58) oder eine der Zwischenrückflußöffnungen (74, 76) aktiviert wird.
- Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß in dem stufigen Steuermodus der Zufluß getaktet aktiviert wird.
- Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß der Zufluß in einem festlegbaren Takt aktiviert wird.
- Verfahren nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß der Zufluß in dem festlegbaren Takt für eine festlegbare Zeitdauer aktiviert wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19935041A DE19935041A1 (de) | 1999-07-26 | 1999-07-26 | Schraubenverdichter |
| DE19935041 | 1999-07-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1072796A2 EP1072796A2 (de) | 2001-01-31 |
| EP1072796A3 EP1072796A3 (de) | 2002-07-10 |
| EP1072796B1 true EP1072796B1 (de) | 2004-10-13 |
Family
ID=7916096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00115787A Expired - Lifetime EP1072796B1 (de) | 1999-07-26 | 2000-07-21 | Verfahren zum Betreiben eines Schraubenverdichters |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6276911B1 (de) |
| EP (1) | EP1072796B1 (de) |
| AT (1) | ATE279652T1 (de) |
| DE (2) | DE19935041A1 (de) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491602B1 (ko) * | 2002-05-11 | 2005-05-27 | 삼성광주전자 주식회사 | 왕복동식 압축기의 이중 실린더장치 |
| DE10242139A1 (de) * | 2002-09-03 | 2004-03-18 | Bitzer Kühlmaschinenbau Gmbh | Schraubenverdichter |
| EP1567770B1 (de) | 2002-12-03 | 2017-01-18 | BITZER Kühlmaschinenbau GmbH | Schraubenverdichter |
| DE10258145A1 (de) * | 2002-12-03 | 2004-06-24 | Bitzer Kühlmaschinenbau Gmbh | Schraubenverdichter |
| ITVI20040034A1 (it) * | 2004-03-03 | 2004-06-03 | Refcomp Spa | Compressore volumetrico a vite con dispositivo di regolazione della portata |
| US20060165543A1 (en) * | 2005-01-24 | 2006-07-27 | York International Corporation | Screw compressor acoustic resonance reduction |
| ITVI20050272A1 (it) | 2005-10-14 | 2007-04-15 | Refcomp Spa | Compressore volumetrico a vite perfezionato |
| WO2007142627A1 (en) * | 2006-06-02 | 2007-12-13 | Carrier Corporation | Slide valve actuation for overpressure safety |
| TW200829849A (en) * | 2007-01-11 | 2008-07-16 | Si-Fu Shen | Multi-purpose coolant-recycling machine |
| JP5358608B2 (ja) * | 2011-03-30 | 2013-12-04 | 日立アプライアンス株式会社 | スクリュー圧縮機及びこれを用いたチラーユニット |
| DE102011051730A1 (de) * | 2011-07-11 | 2013-01-17 | Bitzer Kühlmaschinenbau Gmbh | Schraubenverdichter |
| JP6385708B2 (ja) * | 2014-04-18 | 2018-09-05 | 日立ジョンソンコントロールズ空調株式会社 | スクリュー圧縮機 |
| CN204099200U (zh) * | 2014-09-23 | 2015-01-14 | 江森自控空调冷冻设备(无锡)有限公司 | 可调内容积比的螺杆压缩机 |
| CN111148900B (zh) * | 2017-09-04 | 2021-11-09 | 比泽尔制冷设备有限公司 | 螺旋压缩机 |
| CN110966195B (zh) * | 2019-12-05 | 2024-04-19 | 珠海格力电器股份有限公司 | 精准控制螺杆压缩机自动加载稳定的系统、方法和空调器 |
| CN113550902B (zh) * | 2020-04-24 | 2023-03-31 | 青岛海尔空调电子有限公司 | 螺杆压缩机的卸载控制方法 |
| CN111794969A (zh) * | 2020-04-24 | 2020-10-20 | 青岛海尔空调电子有限公司 | 螺杆压缩机的卸载控制方法 |
| DE102020115442A1 (de) | 2020-06-10 | 2021-12-16 | Bitzer Kühlmaschinenbau Gmbh | Schraubenexpander und Anlage zur Gewinnung elektrischer Energie aus Wärme mit einem Schraubenexpander |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE153169C (de) | ||||
| DE298536C (de) | ||||
| FR1566954A (de) * | 1968-05-22 | 1969-05-09 | ||
| JPS5757A (en) * | 1980-05-28 | 1982-01-05 | Hitachi Ltd | Synchronous motor with permanent magnet |
| DD153169A1 (de) * | 1980-09-30 | 1981-12-23 | Klaus Dietrich | Dynamisch angepasste regelung von anlagen mit integralwirkendem stellantrieb,vorzugsweise schraubverdichtern |
| US4412788A (en) * | 1981-04-20 | 1983-11-01 | Durham-Bush, Inc. | Control system for screw compressor |
| JPS5959A (ja) * | 1982-06-22 | 1984-01-05 | 神農 大海 | ギブス包帯 |
| JPS5949392A (ja) * | 1982-09-11 | 1984-03-21 | Mayekawa Mfg Co Ltd | スクリユ−式圧縮機の吐出ポ−トの開度変更及び容量制御装置 |
| JPH022A (ja) * | 1984-06-20 | 1990-01-05 | Tomio Konno | 真空フアイバー電子通信の方法とその装置 |
| JPS61265381A (ja) * | 1985-05-20 | 1986-11-25 | Hitachi Ltd | スクリユ−圧縮機のガス噴射装置 |
| JPS6262A (ja) * | 1986-03-05 | 1987-01-06 | Ishihara Sangyo Kaisha Ltd | ベンゾイルウレア系化合物の製造方法 |
| US4678406A (en) * | 1986-04-25 | 1987-07-07 | Frick Company | Variable volume ratio screw compressor with step control |
| JPH033A (ja) * | 1989-05-26 | 1991-01-07 | Kimie Mitsunaga | 凹穴底シューズ |
| JP2503718B2 (ja) * | 1990-04-13 | 1996-06-05 | ダイキン工業株式会社 | 制御装置 |
| DD298536A5 (de) * | 1990-10-02 | 1992-02-27 | Kuehlautomat Berlin Gmbh,De | Vorrichtung zur vi-aenderung fuer schraubenverdichter mit kombinierter vi- und teillastverstellung |
| JPH055A (ja) * | 1991-06-24 | 1993-01-08 | Kanzaki Paper Mfg Co Ltd | 播種シートの製造方法 |
| JPH06173872A (ja) * | 1992-12-03 | 1994-06-21 | Hitachi Ltd | スクリュー圧縮機 |
-
1999
- 1999-07-26 DE DE19935041A patent/DE19935041A1/de not_active Ceased
-
2000
- 2000-07-21 EP EP00115787A patent/EP1072796B1/de not_active Expired - Lifetime
- 2000-07-21 DE DE2000508197 patent/DE50008197D1/de not_active Expired - Lifetime
- 2000-07-21 AT AT00115787T patent/ATE279652T1/de not_active IP Right Cessation
- 2000-07-25 US US09/624,903 patent/US6276911B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19935041A1 (de) | 2001-02-08 |
| US6276911B1 (en) | 2001-08-21 |
| EP1072796A2 (de) | 2001-01-31 |
| ATE279652T1 (de) | 2004-10-15 |
| EP1072796A3 (de) | 2002-07-10 |
| DE50008197D1 (de) | 2004-11-18 |
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