DE2308265A1 - ROTATION OR ROTARY LISTON COMPRESSOR SYSTEM WITH OIL CIRCUIT AND VALVE ARRANGEMENTS - Google Patents

Description

2303265

Bauer Compressors, Hans Bauer 8 luünchen 70, Wolfratshauserstraße

Rotary or rotary piston compressor system with oil circuit

and valve arrangements

The invention relates to a rotary piston valve Follow-up request with one in the gas line between Oil separator and compressor or consumer arranged, closing when the compressor drive is switched off Valve and arrangements for simultaneously relieving the oil separator and shutting off the oil supply to the work area of the compressor.

Screw compressors, for example, for compressing gaseous media in many cases verv / ends. they are

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■ reliable and smooth running. The gaseous to be compressed Medium is sucked in through a suction nozzle and thus compressed in the working space of the compressor in a known way, that it is continuously arranged by two interlocking screw threads of two in a housing Rotors from the suction side to the pressure side of the compressor is pushed, whereby the volume of the gas or the air-containing compression gear e is reduced in each case. The compressed gaseous Lledium is after exit the pressure side of the compressor is fed to the consumer through a pressure line.

During compression, cooling, lubrication and sealing are used apart from the dry running compressors, one Liquid, usually oil, is used. The Cl is usually at the beginning of the compression in the work area of the compressor. After the compression has ended, it must be ensured that the oil is again released from the compressed one Gas is disconnected. For this purpose, an oil separator is arranged in the pressure line between the compressor and the consumer. In the oil contained in the compressed gaseous medium is separated from the gas. The separated oil will continuously through an oil line after passing through an oil cooler and an oil filter back into the working area of the Compressor supplied.

If the compressor drive is operated by hand or by a pressure-dependent, in the consumer line is switched off, it must be ensured that the compressed, Gas freed from the oil does not pass through the oil separator and then through the compressor and its suction nozzle can flow out of the screw compressor system and relax in the process. Is in the consumer line therefore, when switching off the compressor drive and the associated drop in gas pressure in the consumer

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line below a setpoint closing valve, as a rule a check valve, arranged. There is also Another one in the pressure line between the pressure port of the compressor and the interior of the Glabscheider, when it falls of the pressure in this pressure line below a predetermined target value closing valve, which is expediently also called Check valve is formed. This valve has the task of switching off the compressor drives a backflow of those located in the oil separator under Avoid pressurized media through the pressure line, the working space of the compressor and the suction nozzle.

On the other hand, however, it must also be ensured that when closing the above-described, preferably as non-return valves formed valves at the same time relieving the oil separator and shutting off the oil supply to the working area of the Compressor takes place. It is known to relieve the oil separator on the consumer line between the check valve and oil separator to connect a relief line, in which an opening when the Konipres ^ orantriebs is switched off Solenoid valve is arranged. In a corresponding way you have to shut off the oil supply to the work area at the same time of the compressor in the oil line coming from the oil separator shortly before its entry into the compressor a solenoid valve provided, which closes when the compressor drive is switched off. The arrangement of the two solenoid valves however, it has significant disadvantages. Apart from the fact that the electrical part of these control valves has an additional Effort means that solenoid valves are not sufficiently reliable for the application at hand. In particular their coils can burn out or be damaged in some other way, rendering the solenoid valves inoperable which can have very detrimental consequences for the entire screw compressor system. For example, would

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in such a case that in the oil separator under pressure Ul located UI can suddenly flow unhindered into the working space of the compressor and out of it through the suction nozzle, what if the suction nozzle (air compressor) is open, apart from the associated loss of energy and oil would result in severe pollution of the environment. With the mentioned susceptibility of the solenoid valves and In particular, from their coils, it should be pointed out that compressors and especially Ivlaße mobile ones Compressors are often exposed to strong shock loads and the like.

In order to counteract these disadvantages of the solenoid valves, the two solenoid valves are each pneumatically controlled Valve replaced. The construction and energy expenditure associated with such valves and their control however, it is also particularly large. This is especially true with regard to the requirement that the relief valve for the oil separator and the shut-off valve for the oil are actuated at the same time when the compressor is switched off have to.

The present invention is based on the object of providing a rotary or rotary piston compressor system, each with one in the gas line between the oil separator and the compressor or consumer when the compressor drive is switched off closing valve as well as simple and particularly effective arrangements for simultaneously relieving the C) I separator and to shut off the oil supply to the working space of the compressor, in which the arrangements for Relieving the oil separator and shutting off the oil supply do not have the disadvantages of the known devices for this purpose.

This object is achieved in that for

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At the same time relieving the oil separator and shutting down the oil supply to the compressor, a single combination valve is provided which is automatically controlled by the gas to be released from the oil separator and the gas exiting the pressure side of the compressor.

The arrangement according to the invention for simultaneously relieving the oil separator and shutting off the oil supply to the compressor has this very essential compared to the known devices Benefits on. Your training as a "single Automatically controlled combined valve means a particularly low design effort. A particularly important one The advantage is that oil separator relief and (.. '! shut-off and their automatic control with each other combined and housed in a single compact valve body are. This results in the discharge of the oil separator and the shut-off of the oil supply when the compressor drive is switched off is absolutely synchronous, especially if they are more conveniently one and the same Valve lift are initiated automatically.

According to a preferred embodiment, the combination valve has a violet body guided coaxially in a cylindrical housing body, which is formed by two terminal drive pistons and two shut-off pistons arranged therebetween at a fixed distance from one another and coaxially to these, with one drive piston from the gas to be expanded from the oil separator and the other drive piston from the gas exiting the working chamber of the compressor on the pressure side in the sense of opposing axial directions of movement en of the piston body.: rG. Piierbei is preferably the piston area, which can be acted upon by the pressure-exiting gas from the working chamber of the compressor, greater than that

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Piston area caused by the gas to be expanded from the oil separator can be acted upon.

Advantageously, the two shut-off pistons are each assigned a passage located in the housing body, wherein the two passageways are sealed against each other.

The inventive combine! ons valve is simple. With regard to the "demand raised, among other things, that after switching off the compressor drive only as little Ul as possible flow into the interior of the compressor is to be, it is advantageously arranged in the cage where the oil line enters the compressor. Here is the Oil line on both sides to the C'l passage of the combination valve connected. A corresponding line runs from the consumer line between the oil separator and Check valve outgoing venting line on the one hand End of the gas passage and sits down at the other

away
o side of the gas passage where it expediently has a GerLV silencer on its linden tree, through which the gas to be expanded from the oil separator into the x ^? can flow into a high voltage container. The shut-off pistons, which are rigidly connected to one another and are provided for opening and closing the two passageways when the compressor drive is switched off, are each actuated by an associated drive piston. A cylinder chamber is provided in the housing body to pressurize the two end drive cages, one cylinder chamber being connected to the relief line, while the other cylinder chamber is connected by a line to the pressure line between the pressure port of the compressor and the check valve. The loadable piston surface of the drive unit assigned to this cylinder space

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piston is preferably larger than the loadable piston area of the other drive piston.

When the compressor is in operation, the piston body becomes the one according to the invention Combination valve as a result of the application the one preferably larger piston area with the one exiting from the working chamber of the compressor on the pressure side and through the aforementioned connecting line in the associated The gas entering the cylinder chamber is held in one position, in which the gas passage of the combination valve closed by the associated shut-off piston, but the UI passage is open. When switching off the However, the compressor drive drops the gas pressure in the pressure line and accordingly also in the one with disser in open Connection standing cylinder chamber of the preferably larger drive piston. Thus, the other from whom can continue The drive piston, which was essentially under the final compression pressure, pushed the piston body into the opposite direction Press direction, so that now the Cl passage way blocked by the corresponding shut-off piston, but the gas passage is opened.

It should also be pointed out that the mode of operation of the combination valve according to the invention in principle This is also ensured if the gas exiting from the working space of the compressor can be acted upon on the pressure side The piston area is not larger than the piston area that can be acted upon by the gas to be expanded from the oil separator. Because the compressed gas faces a certain pressure loss when passing through the oil separator experiences the pressure state of the compressed gas before it enters the oil separator, is namely during operation of the Compressor is the pressure on the drive piston that exits on the pressure side from the working chamber of the compressor

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Gas is applied, greater than the pressure on the other drive piston, that of the gas to be expanded from the oil separator is applied. As a result of this pressure difference, the piston body of the combination valve according to the invention is thus even with the same size pressurized IZoIb en areas the two drive pistons are always held in the position in which the UI passage path is used when the compressor is in operation open and gas passage is closed.

According to another advantageous embodiment, this The combination valve according to the invention has a piston body which is guided coaxially in a cylindrical housing body and which by two drive pistons and one located between them at a fixed distance and arranged coaxially to them Shut-off piston is formed, one of which has a coaxial drive and shut-off bolt on its outer surface having drive piston from the gas to be expanded from the oil separator and the other drive piston from the gas escaping from the compressor's working space on the pressure side in the sense of opposing axial directions of movement of the piston body can be acted upon. This is the piston area which is caused by gas from the compressor's working chamber on the pressure side exiting gas can be acted upon, preferably larger than the ^ uersclinittsflache of the drive and Shut-off bolt, which can be acted upon by the gas to be released from the oil separator.

The surface of the drive and shut-off bolt used to drive the piston body and shut off the gas supply from the oil separator is advantageously conical, with a correspondingly beveled sealing edge assigned to it in the end wall of the housing body α. Between the pressurized by the gas to be expanded from the oil separator

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Drive piston and the headband of the housing body assigned to it is advantageously one, the drive and Shut-off bolts are preferably arranged coaxially surrounding the compression spring.

One advantage is the shut-off piston and the drive and shut-off bolts this embodiment also in each case associated with the passage located in the housing body, the two passageways being sealed off from one another are.

Construction and operation of this guide from the Forin erfindungsgenäßen Koinbinationsventils entsprecnen ;;: rurias; 's positive result aes erfinüungsgeinäßen combined Antriebe- and _downs,' suddenly the off fuhxY.n .'- described first. '.. > errbolzens this last-described embodiment of the combination valve still has a further simplification. With this feature, the passage for the gas to be expanded from the oil separator can also serve as an access route for this gas to the previous drive on the drive and shut-off bolt. '*' _Ad ditional explanations of the constructive and functional details of the design of the erfincmngsgemäß en Kombinetionsventils result from the drawing in conjunction with aer description of a corresponding embodiment.

respectively

The invention is illustrated below with reference to an exemplary embodiment shown schematically in the drawing. Show it:

FIG. 1 shows a screw compressor system with an arrangement according to the invention for relieving the pressure on the separator and (shut-off when the compressor drive is switched off)

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FIG. 2 shows in detail an according to the invention used in the arrangement according to FIG Combination valve in axial longitudinal section and

Figure 3 shows in detail another embodiment one of the invention devices used in an arrangement according to FIG Combination valve in axial longitudinal section.

The screw compressor system shown in FIG. 1, which is used, for example, to compress air, has an ochraubenkoifir> res:, or 1. In the working space of the compressor 1, a male 2 and a female 3 (not shown) Robor are arranged, the two rotors 2 and 3 working with one another. In the case of the drive of the two rotors indicated by rotary arrow 5 by means of a drive arrangement not shown in the drawing, air is sucked into the working space of the compressor ^{through the suction nozzle 1} Y. In the working space, the air is compressed in the manner already described at the outset and then leaves the compressor through a pressure port 6 and a pressure line 7 connected to this in the direction of the consumer.

At the beginning of the ivoiapres.äon, GI is introduced into the working space of the compressor for cooling, ocnmierung and sealing, which after completion of the compression from the compressed air again. ¹ must be removed. For this purpose, the pressure line 7 first opens into an oil separator 8 in which the compressed air and oil are separated in a known manner. The air freed from the oil leaves the oil separator 8 through a consumer line 9 according to arrow 10

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towards the consumer. Furthermore, the separated flows Ll from the oil chamber of the Clabscheider 8 during the Compressor operation continuously back through an oil line 11. to the working space of the compressor 1, v / o it is added to the air at the beginning of the compression. During the backflow the ul is cooled by a cooler 12 and then filtered by a filter IJ, both of which are arranged in the oil line 11.

In the pressure line 7 and the consumer line 9 is one check valve 14 or 15 installed in each case. The check valves 14 and 15 close automatically when the Compressor drive is switched off by hand or a control arrangement, not shown in the drawing, as the Pressure in the pressure line 7 or the consumer line 9 drops. This state is shown in the drawing.

When the compressor drive is switched off, care must be taken at the same time that the pressure in the oil separator closed by the two check valves 14 and 15 is relieved and that the further oil supply to the compressor 1 is also shut off. For this purpose, in the Aähe the entry of the oil pipe 11 is disposed in the working space of the compressor 1 a erfindun _f "s invention from which to relaxing gas from UEM oil separator 8 and the pressure side emerging from the working space of the compressor 1 Gas automatically controlled Is ombinaitionsventil sixteenth The The exact structure and mode of operation of the combination valve 16 are explained in detail below with additional reference to the detailed drawing of the combination valve 16 in FIG.

The combination valve 16 has one in a cylindrical

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Housing body 17 coaxially guided piston body 18. The piston body 18 has two terminal drive pistons 19 and 20 and two between them at a fixed distance to each other and to these coaxially arranged shut-off pistons 21 and 22. The drive piston 19 is of the to be expanded gas is applied from the oil separator 8, which through a relief line 23 and a branch line 24- can flow unhindered into a cylinder space 25 assigned to the drive piston 19. In appropriate The drive piston 20 of the gas exiting from the working chamber of the compressor 1 on the pressure side is another acted upon, which is unimpeded by a connecting line 26 in one of the drive piston 20 assigned Cylinder chamber 27 can flow in. The cylinder space 27 is in FIG. 2 is practically completely filled by the drive piston 20. The piston surface that can be acted upon by gas of the drive piston 20 is larger than that in the preferred embodiment shown in the drawing piston surface 29 of the drive piston 19 that can be acted upon by gas

The shut-off piston 21 is assigned a Cl passage 30 which is arranged in the housing body 17 and on which there are outside of the housing body 17, the oil line 11 connects. In a corresponding manner, the shut-off piston 22 is an im Housing body 17 arranged gas passage 31 assigned, to which the relief line 23 connects outside the housing body 17. The two passageways 30 and 31 are inside the case body 17 sealed against each other by a seal 32.

The drawings show the state when the compressor drive is switched off. At this point in time the pressure of the air exiting the compressor 1 on the pressure side, which is also in the connecting line 26, falls

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prevails in such a way that the compressed air built up in the oil separator between the now closed check valves 14 and 15 flows through the relief line 23 and branch line 24 into the cylinder chamber 25 and keeps the drive piston 19 and with it the entire piston body in the axial division shown in the drawing . In this 18 position of the piston body is 0 by the Abspe-rrkolben blocked 21 oil-Durcntrittsweg ~ $, aomit can no more oil to more. The working space of the compressor. On the other hand is; at the same time the shut-off piston is in such an axial position that the gas Jurolitrittsv / eg 31 is open. B omit the to ent si. Incoming air from the interior of the oil separator ^ 8 through a relief line 23 and a noise damper 33 arranged on ar.l. ^ nuo cioser according to i feil 34 in ;; jrcie flow out, whereby the oil separator S relieves v.lro ..

However, if the compressor drive is switched on again, after a short time the air pressure in the pressure port 6 of the compressor 1 and thus also in the connecting line 26 leading to the cylinder chamber 27 and to the larger actuatable piston surface 28 aes combination valve 16 is higher than the air pressure at the output de; , oil separator 8 and, accordingly, the relief line 23 and branch line 24 leading to the cylinder chamber 25 of the housing body-s. In this position, the gas passage 31 is blocked by the shut-off piston 22, while the oil passage 30 is open. The compressor system according to the invention can then work as intended, with oil continuously from the oil chamber of the Clabscheider 8 into the

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Can get working space of the compressor 1 and on the other hand an unnecessary outflow of compressed air from the Compressor system does not take place.

In Figure 3 is a compared to the combination valve 16 according to the invention modified combination valve in detail 16 'shown. The combination valve 16 'is used instead of the combination valve 16 in a screw compressor system can be used according to FIG. In its structure and its mode of operation, it basically corresponds the combination valve 16, but it has a further simplification in relation to this in particular on.

The combination valve Iu ¹ has a piston body 18 'guided coaxially in a cylindrical housing body 17', which piston body 18 'is formed by two drive pistons 19' »20 'and a shut-off bolt located between these at a fixed distance and arranged coaxially with the latter. One of the drive pistons 19 '(according to arrow 23') with a coaxial drive and shut-off bolt 37 at its outer end are from the gas to be expanded from the oil separator 8 and the other drive piston 20 '(according to arrow 26 ¹ ) from the the working chamber of the screw compressor 1 on the pressure side exiting gas in the sense of opposing axial directions of movement of the piston body 18 * acted upon. In this embodiment too, the piston surface 28 ', which can be acted upon on the pressure side by the gas emerging from the working chamber of the screw compressor 1, is preferably larger than the cross-sectional area of the drive and shut-off bolt 37' which can be acted upon by the gas to be released from the oil separator 8.

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The shut-off piston 21 'is assigned an oil passage 30' in the housing body 17 ', to which the oil line 11 is connected outside the housing body 17'. In
correspondingly, the drive piston 19 'and in particular its drive and shut-off pin 57 is an im
Housing body 17 '> 39 assigned gas passage path, to which the relief line 23 is connected outside the housing body 17''39. The two passageways 30 'and 31' are sealed against one another within the housing body 17 'by a seal 32'.

The drawing shows the state when the compressor drive is switched off, in v / elcliem the 01 passage 30 'blocked by the shut-off piston 21' is. On the other hand, the drive and locking pin is at the same time 37 in such an axial position that the gas passage 31 'is open. So that the XoI body 18 'this axial position after critical loading of the drive and shut-off pin 37 by the gas to be expanded from the oil separator 8 with security is also achieved, between the end wall 39 of the housing body 17 'and the drive piston 19' is a drive and Locking pin 37 arranged coaxially surrounding compression spring 4-1.

If the iCompr ess orant is switched on again, the piston body 18 'is pressed out of the compressor pressure port 6 in the direction of the arrow 37' by the higher pressure acting on the drive piston 20 'until the conical
The end face 38 of the drive and shut-off bolt 37 rests firmly on the correspondingly beveled sealing edge 40 assigned to it in the end wall 39. During this adjustment movement, the relatively low spring force is the

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Spring 41 overcome.

As already indicated above, this is different Combination valve 16 'from the combination valve 16 in the Essentially through the combined drive and shut-off bolt 37 arranged on the drive piston 19 'Since the drive and locking pin 37 both for driving the piston body 18 'by the gas to be expanded from the oil separator 8 as well as to shut off the passage 31' serves for this gas through the combination valve 16 ', forms the gas passage 31' in a simple manner at the same time the access path for the gas from the oil separator S to act on the drive piston 19 'and in particular of its drive and shut-off bolts 37 · Thus, in this embodiment, the branch line is also omitted 24 (Figure 1),

The arrangement according to the invention for simultaneous relief of the oil separator and shutting off the oil supply to the compressor when the compressor drive is switched off can not only be in new rotary or rotating basket compressor systems to be created, but also afterwards with simple letters install in corresponding, already used, also older systems.

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Claims (1)

230326-5 - 17 - Expectations 1. Rotary or rotary piston compressor system, each with a valve arranged in the gas line between the oil separator and the compressor or consumer, which closes when the compressor drive is switched off, as well as arrangements for simultaneously relieving the oil separator and shutting off the oil supply to the working chamber of the compressor, characterized in, that to simultaneously relieve the oil separator (8) and spor off the oil supply to the compressor (1), a single gas from the oil separator (8) and the gas exiting from the working space of the compressor (1) on the pressure side: Gas automatically controlled combination valve (16, In ¹ ) is provided. 2. Rotational bzu. Rotary piston compressor device according to claim 1, characterized in that the combination valve (16) one in a cylindrical housing body (17) coaxially guided piston body (18), which by two terminal drive piston (19 »20) and two between these at a fixed distance from each other and coaxially to them arranged shut-off piston (21, 22) is formed, v / whether the one drive piston (19) of the one to be relaxed Gas from the oil separator (8) and the other drive piston (20) from the one from the working chamber of the compressor (1) Gas escaping on the pressure side in the sense of opposing axial directions of movement of the piston body (18) can be acted upon. 3. Rotary or rotary piston compressor system according to claim 2, - 18 - 409834/0243 2303265 characterized in that the KoIbenflache (28), the can be acted upon by the gas exiting on the pressure side from the working space of the compressor (1), is greater as the piston surface (2S), which can be acted upon by the gas to be expanded from your oil separator (8). 4-. Rotary or rotary piston compressor system according to claim 2 or J, characterized in that the two j ± o locking columns (21, 22) are each assigned a passage (30 or 31) located in the housing body (30 or 31), the two passage ways (30 ? 31) Are each sealed against each other. an] he, e 5. Rotary or rotary piston compressor / according to claim 1, characterized in that the combination valve (16 ') has a piston body (18 ^{1 ) guided coaxially in a cylindrical housing body (17 1} ), v; elchor by two drive pistons (19', 20 ') and a fixed distance between them and ^{Shut-off piston (21 1} ) arranged coaxially to these is formed, with the one on its outer linden one: coaxial drive and shut-off bolts (37) having drive piston (19 ¹ ) from a gas to be expanded from the oil separator (8) and the other drive shaft (20 ') can be acted upon by the gas emerging on the pressure side from the working chamber of the compressor (1) in the sense of mutually opposite axial directions of movement of the piston body (18 ¹ ). system 6, rotary compressor / according to claim 5, characterized in that the piston surface (28 *) »the through which the gas exiting from the working space of the compressor (1) can be acted upon on the pressure side, is greater than the cross-sectional area of the drive and shut-off bolt (37) »the gas to be expanded from the Oil separator (8) can be acted upon. 409834/0243 -I ₉ - Plant 7 · Rotary piston compressor / according to claim 5 or 6, characterized in that the surface (38) of the drive and shut-off device used to drive the piston body (18 ') and shut off the gas supply from the oil separator (8) Olzens (37) is conical, it being assigned a correspondingly beveled sealing edge (4-0) in the end wall (39) of the housing body (17 ^1). system 8. Rotary or rotary piston compressor / according to one or more of claims 5 to 7, characterized in that between the from the gas to be expanded from the oil separator (8) beaufjchlagbaren drive piston (19 ¹ ) and its associated end wall (39) cLes Housing body (17 ¹ ) a compression spring (4-1) which preferably coaxially surrounds the drive and shut-off bolts (37) is arranged. system 9. Rotary or rotary piston compressor / according to one or more of claims 5 to 8, 'characterized in that the shut-off piston (21 ¹ ) and the drive and shut-off bolts (37) each have a passage in the housing body (17' »39) (30 ¹ , 31 ') is assigned, the two passageways (30 *, 31') being sealed off from one another. 409834/0243 Blank page