EP0081711A1 - Dispositif de commande pour un compresseur - Google Patents
Dispositif de commande pour un compresseur Download PDFInfo
- Publication number
- EP0081711A1 EP0081711A1 EP82110874A EP82110874A EP0081711A1 EP 0081711 A1 EP0081711 A1 EP 0081711A1 EP 82110874 A EP82110874 A EP 82110874A EP 82110874 A EP82110874 A EP 82110874A EP 0081711 A1 EP0081711 A1 EP 0081711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- valve
- compressor
- piston
- line
- 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- Withdrawn
Links
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005187 foaming Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007789 sealing Methods 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
- F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
Definitions
- the invention relates to a control device according to the preamble of claim 1.
- valves In screw compressors with oil injection, it is known to provide a minimum pressure or pressure-maintaining valve in the pressure line, which builds up and maintains a minimum pressure in the compressor when the compressor starts up in order to avoid foaming of the oil.
- Such valves have a simple construction with a valve body, which is acted upon by a spring against the direction of flow of the compressed air supplied by the compressor and shuts off the pressure line as soon as the predetermined minimum pressure is reached on the compressor side.
- the invention has for its object to provide a control device of the type specified in such a way that compressed air cannot escape briefly into the pressure line when the compressor is switched off.
- the simplest means enable the pressure line to be shut off at the moment when the compressor is switched off or switched to idling, so that compressed air can escape from the compressor with certainty. This also prevents the oil from foaming and escaping into the pressure line.
- the pressure held in the compressor by the minimum pressure valve can be continuously adjusted and continuously changed by the control pressure. In addition to the shut-off function of the minimum pressure valve, this results in an integrated control for the pressure to be built up when the compressor starts up until the minimum pressure valve opens.
- the single figure shows a schematic representation of a compressor with a minimum pressure valve arranged in the pressure line, which can be acted upon by a control pressure.
- the compressor 1 is shown schematically.
- it can have the configuration described in DE-OS 29 38 557.
- a minimum pressure valve 3, shown in detail, is arranged in the pressure line 2 of the compressor.
- a guide part 5 is held concentrically by radial webs, in which a Intermediate piston 6 is slidably guided.
- a valve body 7 is guided, which shuts off the pressure line 2 in the position shown.
- a compression spring 8 is arranged, which acts on the intermediate piston 6 in the closing direction of the valve.
- a further compression spring 9 is arranged in the intermediate piston 6, which is supported on the intermediate piston 6 and acts on the valve body 7 in the closing direction.
- a bore 11 is guided through one of the webs and opens into the cylinder space 10 and is connected to a control pressure line 12.
- the opposite pressure surface of the intermediate piston 6 lies freely in the valve channel.
- a pressure compensation line in the valve body 7 is designated, which connects the side of the valve body acted upon by the compression spring 9 with the valve channel.
- a pressure measuring bore is shown, which opens on the pressure side of the valve.
- This minimum pressure valve with a check function is designed, for example, so that it begins to open at a pressure difference of 3 bar. If a pressure of 3 bar is built up on the pressure side when the compressor starts up, while the pressure is still zero on the consumer side, the valve body 7 begins to lift off the valve seat 15. Here, the valve still acts as a throttle in the pressure line 2, as a result of which the full operating pressure on the pressure side is reached more quickly. With increasing Pressure applied to the end face of the intermediate piston 6 is pushed into the guide part 5 against the force of the compression spring 8, the valve body 7 with its annular shoulder being held against the intermediate piston 6 by the pressure difference which is still present. The valve is designed so that, for example at a pressure of 7 bar on the pressure side, the full flow cross-section is open and there is no longer a pressure difference between the pressure and consumer side on the valve.
- the compression spring 9 comes into effect, which presses the valve body 7 into the closed position as soon as there is no longer a pressure difference on the two sides of the valve body 7. If the control pressure line 12 is connected to the atmosphere, the pressure existing on the rear of the valve body 7 is sufficient to hold the intermediate piston 6 in the cylinder space 10 in the inserted position, while the compression spring 9 holds the valve body 7 in the closed position, as is the case in the upper position Half of the figure shows.
- the pressure on the consumer side can decrease faster than that in the compressor when the compressor is switched off or switched back to idle existing delivery pressure.
- the valve does not close immediately when the compressor is switched off, with compressed air still escaping from the compressor into the pressure line and causing oil in the compressor to foam up.
- the control pressure line 12 is provided with a valve 16 and is connected to the volume of the compressor which is under the delivery pressure, as shown schematically in the figure.
- the switching valve 16 is with the Not. shown control unit of the compressor connected so that when starting the compressor, for example, the control pressure line leading to the cylinder chamber 10 of the valve is connected to the atmosphere.
- the cylinder chamber 10 is simultaneously connected via the changeover valve 16 to the pressure side or the pressure prevailing in the compressor, so that the same pressure is present in the cylinder chamber 10 as on the end face of the valve body 7 and the valve is closed instantaneously by the pressure springs 8,9.
- control pressure line 12 it is also possible to connect the control pressure line 12 to a control unit, by means of which a certain pressure in the cylinder space 10 is built up or changed in a certain way even when the compressor 1 starts up, so that the pressure build-up in the compressor can be controlled in the desired manner by means of the minimum pressure valve can.
- control pressure in the closing direction to the minimum pressure valve is advantageous not only with regard to the foaming of oil in the compressor, but also when the pressure line 2 is connected to a delivery line, for example for dusty media or the like. If the compressor 1 is switched back to idle in such a case so that dust-like material can be refilled in the delivery line, the control pressure in the cylinder chamber 10 ensures that the pressure line 2 remains shut off and the dust-like material is not whirled up or turned off when the conveyor system is switched off is blown out.
- valve body of which is designed as a piston or is connected to a piston, so that by applying a control pressure on the side already acted upon by the compression spring, the valve body can be moved into the closed position immediately.
- the changeover valve 16 is preferably a solenoid valve which is connected to the electrical control unit of the compressor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary-Type Compressors (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813146535 DE3146535A1 (de) | 1981-11-24 | 1981-11-24 | "steuerungsvorrichtung fuer einen verdichter" |
| DE3146535 | 1981-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0081711A1 true EP0081711A1 (fr) | 1983-06-22 |
Family
ID=6147071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82110874A Withdrawn EP0081711A1 (fr) | 1981-11-24 | 1982-11-24 | Dispositif de commande pour un compresseur |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0081711A1 (fr) |
| JP (1) | JPS5893981A (fr) |
| AU (1) | AU9082682A (fr) |
| BR (1) | BR8206781A (fr) |
| DD (1) | DD207560A5 (fr) |
| DE (1) | DE3146535A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0608311B1 (fr) * | 1991-10-14 | 1997-11-26 | Cash Engineering Research Pty. Ltd. | Combinaison de commande d'admission pour systeme de compresseur |
| US5803715A (en) * | 1991-10-14 | 1998-09-08 | Cash Engineering Research Pty. Ltd. | Inlet control combination for a compressor system |
| WO2018054885A1 (fr) | 2016-09-21 | 2018-03-29 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Soupape à seuil de pression destinée à un compresseur à vis pour un véhicule, en particulier un véhicule utilitaire |
| CN110307142B (zh) * | 2019-06-28 | 2020-09-29 | 大唐半导体科技有限公司 | 一种空压机的控制方法和空压机 |
| CN110748681A (zh) * | 2019-10-29 | 2020-02-04 | 苏州寿力气体设备有限公司 | 一种双工况移动式空气压缩机用最小压力维持阀 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123093A (en) * | 1964-03-03 | Minimum pressure delivery valve assembly | ||
| DE2822779A1 (de) * | 1977-05-25 | 1978-12-07 | Hydrovane Compressor | Rotationsverdichter mit oelabdichtung |
| DE2938557A1 (de) * | 1979-09-24 | 1981-04-23 | Isartaler Schraubenkompressoren Gmbh, 8192 Gertsried | Verdichteranlage |
-
1981
- 1981-11-24 DE DE19813146535 patent/DE3146535A1/de not_active Withdrawn
-
1982
- 1982-11-22 DD DD24513582A patent/DD207560A5/de unknown
- 1982-11-22 JP JP57203828A patent/JPS5893981A/ja active Pending
- 1982-11-23 AU AU90826/82A patent/AU9082682A/en not_active Abandoned
- 1982-11-23 BR BR8206781A patent/BR8206781A/pt unknown
- 1982-11-24 EP EP82110874A patent/EP0081711A1/fr not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123093A (en) * | 1964-03-03 | Minimum pressure delivery valve assembly | ||
| DE2822779A1 (de) * | 1977-05-25 | 1978-12-07 | Hydrovane Compressor | Rotationsverdichter mit oelabdichtung |
| DE2938557A1 (de) * | 1979-09-24 | 1981-04-23 | Isartaler Schraubenkompressoren Gmbh, 8192 Gertsried | Verdichteranlage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5893981A (ja) | 1983-06-03 |
| DD207560A5 (de) | 1984-03-07 |
| DE3146535A1 (de) | 1983-06-01 |
| BR8206781A (pt) | 1983-10-04 |
| AU9082682A (en) | 1983-06-02 |
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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 |
Designated state(s): BE DE FR GB SE |
|
| 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: 19840531 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HOFMANN, RUDOLF Inventor name: MAGDHUBER, KURT |