EP2674571A2 - Pump power unit with liquid-ring pump - Google Patents

Abstract

The unit (10) has a liquid ring pump (11) comprising a cylindrical pump casing (14) that surrounds a working space (15). The working space communicates with an intake opening (19) over a control disk (18). An eccentrically arranged running wheel (16) is connected with a drive shaft (17). The liquid ring pump is releasably connected to a connection unit (12) i.e. connection housing (13), that comprises an inlet (20), where the inlet communicates with the intake opening. The liquid ring pump is mounted as an axial plug-in unit in the connection housing.

Description

The present invention relates to a pump set comprising a liquid ring pump and a connection unit

Liquid ring pumps or compressors have been known for a long time and are used in a wide variety of process engineering processes. By way of example, the use in plants for the production of plastics or medicaments, for bottling beverages, for papermaking, and for use in medical or food sterilizers may be mentioned here.

Liquid ring vacuum pumps or compressors operate on the positive displacement principle, wherein - in the most widely used design - a motorized, vaned impeller is arranged eccentrically in a pump housing having an interior with a substantially circular cross-section. In the pump housing is a working fluid, such as water, which is set by the rotation of the impeller in rotation and forms a liquid ring. Adjacent blades of the impeller define with the liquid ring and the hub of the impeller chambers, which have a dependent on the angular position of the chamber due to the eccentric bearing of the impeller, wherein the liquid ring more or less deeply penetrates into the chamber and acts as a displacer. In addition, control means are provided in which openings, so-called suction and pressure openings, are recessed, via which the chambers communicate with the inlet and outlet of the pump. In this case, the suction opening is in the angular range in which an increase in the chamber volume takes place, while the pressure opening is arranged in the angular range with decreasing chamber volume. Liquid ring pumps are particularly suitable for conveying gases and vapors. However, liquid streams can also be conveyed to some extent. Due to the principle, during the operation of a liquid ring pump, a certain proportion of operating liquid originating from the liquid ring is always discharged.

The operating fluid of the pump has essentially three functions. On the one hand, as explained above, it acts as a piston of the positive displacement pump. In addition, it seals the individual chambers of the impeller against each other, so that an oil-free delivery of the fluid to be pumped is possible. The continuous co-promotion of a portion of the operating fluid also allows to dissipate the heat of compression occurring during operation. It must therefore be supplied continuously operating fluid, so that the liquid ring is kept at a constant level.

Due to this basic structure, the liquid ring pump is extremely wear-resistant, has a high level of reliability and generates only very low intrinsic noise.

The most common are so-called axially loaded pumps. In this case, the impeller is limited in the axial direction by non-rotatably arranged in the pump chamber control discs, in which the suction and pressure openings are recessed. The flow direction of the fluid entering the impeller and leaving the impeller is axial, ie parallel to the axis of the pump shaft on which the impeller is seated. Examples of such axially pressurized liquid ring pumps, for example pumps in bearing carrier construction, in block design or in the form of a fixed to a bearing support block pump, are in the German utility model DE 298 09 258.1 U the applicant described.

In the DE 10330541 A1 there is described a rotary vane vacuum pump wherein the inlet pre-chambers are located on one side of the pump and the outlet post-chambers are on the other side of the pump. The arrangement described there is specifically designed for the pneumatic conditions of a rotary vane vacuum pump and not transferable to liquid ring vacuum pumps.

Liquid ring vacuum pumps are widely used in one or two stages. Two-stage liquid ring pumps are used in applications requiring relatively high vacuums. The two-stage liquid ring pump can reach ultimate pressures typically between 150-25 mm Hg.

In typical use, the liquid ring pumps are part of more or less complex pump units, which include in addition to the actual pump and suction and discharge lines for the medium to be pumped, compressed air lines, liquid separator, liquid condensers, heat exchangers, etc. Such pump units typically consist of individual components, which are connected to one another via lines and are assembled for the specific application in each case. Such Pumaaggregate are therefore relatively complicated in construction and expensive and can be adapted to different tasks only consuming. The maintenance of individual components of the pump set is labor-intensive, since numerous connections must be removed and reassembled.

The present invention is therefore based on the technical problem of providing a pump unit that is simple and space-saving, and that allows easy maintenance of the pump itself, in particular the liquid ring pump.

This technical problem is solved by the pump unit according to the present claim 1. Advantageous further developments of the pump unit according to the invention are subject matters of the dependent claims.

The invention accordingly relates to a pump unit which comprises a pump, in particular a liquid ring pump, and a connection unit, wherein the liquid ring pump has a pump housing which surrounds a first working space which communicates via a first control disk with a suction opening for a fluid to be conveyed, and in a first, rotatably connected to a drive shaft impeller is arranged eccentrically. The pump unit according to the invention is characterized in that the pump is detachably connected to the connection unit and that the connection unit has a suction nozzle which communicates with the suction opening of the pump.

The invention is suitable for a large number of pumps, in particular displacement and centrifugal pumps, and is explained in more detail below with reference to the use of a liquid ring pump.

Accordingly, the invention proposes a modular pump unit in which at least the suction line for the fluid to be delivered is not directly connected to the suction opening of the liquid ring pump, but with a connection unit to which the liquid ring pump can be releasably attached and for a communicating connection sucks between the intake manifold of the connection unit and the suction port of the liquid ring pump. In the case of maintenance, the liquid ring pump can therefore be easily detached from the connection unit without having to make any changes to the suction lines of an optionally more complex pump unit. In addition, in the sense of a modular construction, the connection unit can have additional additional modules which, if appropriate, can also be detachably or non-detachably connected to the connection unit and which are explained in more detail below.

The connection unit may be a simple, plate-shaped module, which is flanged, for example, to the front side of the pump housing of the liquid ring pump and, except the suction, internal channels and an opening which is located above the suction port of the liquid ring pump. Preferably, the connection unit is designed as a connection housing, wherein the liquid ring pump is detachably mounted as a plug-in unit in the connection housing. Thus, the liquid ring pump can be easily pulled out of the junction box for maintenance.

For example, the liquid ring pump may be formed as an axial plug-in unit which is sealed axially or radially to the connection housing. In this case, the pump housing preferably has a substantially cylindrical general shape. In many applications, the medium to be pumped is a gas / liquid mixture and / or the medium contains after passing through the liquid ring pump still residual parts of the operating fluid of the pump. According to a variant of the invention, the pump unit therefore has an integrated first liquid separator on the pressure side. By integrating the liquid separator in the pump unit, the pump unit can be made compact accordingly. The first liquid separator may be, for example, a cyclone separator.

According to a first embodiment, the integrated first liquid separator is arranged in the connection unit. For example, the liquid separator can connect directly to the pressure opening of the liquid ring pump. Such an embodiment is preferably used in a single-stage liquid ring pump, in particular in a single-stage block-type liquid ring pump, in which the suction opening and the pressure opening are provided on the end face of the pump.

According to an alternative embodiment, the integrated first liquid separator is arranged between the pump housing and an engine of the liquid ring pump driving the drive shaft. Such an arrangement can be selected, for example, when the pressure opening is located on the opposite side of the suction opening with respect to the impeller. Such an arrangement can also be selected, for example, if a multi-stage, in particular a two-stage liquid ring pump is used and the pressure port of the second stage is oriented in the direction of the motor of the pump.

In both variants, it can be provided that the integrated first liquid separator has at least one outlet opening for the fluid to be delivered, which opens into an intermediate space provided in the connection unit. This intermediate space can represent, for example, a connection between the first separator and a second, downstream separator.

According to a variant, in particular, if the connection unit is designed as a plate-shaped element on the end face of the liquid ring pump, this intermediate space can be a channel piece adjoining the first separator within the plate-shaped element. According to another variant, in particular when the connection unit is designed as a connection housing and at least partially surrounds the liquid-ring pump designed as a plug-in unit, the intermediate space can also be recessed between the pump housing of the liquid ring pump and the connection housing. The outlet of the first liquid separator then opens into this intermediate space.

Preferably, the pump unit has a two-stage liquid separator, so that the connection unit comprises a second liquid separator, which in turn communicates with the space provided in the connection unit. The second liquid separator may for example be a gravitational separator.

The connection unit can also have a condenser for the fluid to be delivered. The condenser is preferably arranged between the suction nozzle of the connection unit and the suction opening of the pump housing. In the condenser, a cooling of the fluid to be delivered can take place in order to separate off individual components of the fluid mixture as a liquid (for example water from a water vapor / air mixture to be delivered). For this purpose, the connection unit preferably has at least one inlet connection and one outlet connection for a cooling medium, for example cooling water, flowing through the condenser. The condenser can be detachably mounted on the connection unit, wherein the corresponding passage openings for the fluid to be delivered and / or the cooling medium can be closed when the condenser is removed.

Depending on the type of fluid to be delivered and / or the delivery pressures to be achieved, there may be a significant heat input into the operating fluid of the liquid ring pump. The connection unit therefore preferably also has a heat exchanger which communicates with the operating fluid of the vacuum pump. The connection unit may in this case also include inlet connection and outlet connection for a cooling medium of the heat exchanger. In the sense of a modular construction, the heat exchanger can in turn be detachably mounted on the connection unit.

The connecting pieces for the fluid to be delivered and / or cooling medium can be provided directly on the condenser or the heat exchanger. Preferably, however, the heat exchanger and the condenser do not have their own connecting pieces, but rather communicate via corresponding openings with the main body of the connecting unit. All required connection pieces can be provided in this case on the main body of the connection unit. Thus, the pump unit according to the invention can quickly and easily to different tasks be adjusted. For example, the condenser and / or the heat exchanger can be flowed through by different cooling media.

The cooling of the operating fluid of the pump in the heat exchanger can be carried out as continuous cooling or as open or closed circulation cooling. In the case of continuous cooling, the vacuum pump is supplied with fresh cooling medium (eg fresh water) and then discharged into the sewage system, for example, the amount of fluid required by the vacuum pump from an adjoining reservoir filled up to wave height itself In the case of open circulation cooling, the vacuum pump is provided with a separator in which the gas / liquid mixture is separated and part of the operating fluid goes back into the vacuum pump Liquid is only supplied to the extent that the influence of the reduction of the pumping speed due to the increased vapor pressure is economical runs and cooled back via a heat exchanger. According to a preferred embodiment of the pump unit according to the invention, the necessary heat exchanger is mounted directly on the connection unit for the closed circulation cooling. If, in addition, a precondensation in the process fluid is necessary, a capacitor can also be mounted directly on the connection unit. The heat is delivered to an available cooling medium. In both cases, the cooling medium may be both gaseous (preferably air) and liquid (preferably water). Other heat sinks are also possible.

According to a preferred embodiment of the invention, a valve for controlling the condensation of vapor contained in the fluid to be delivered is arranged between the suction port of the connection unit and the suction opening of the pump housing. When starting the pump, for example, the valve can be largely closed to allow in the upstream capacitor, a substantial condensation of liquid vapor contained in the fluid mixture.

The valve may for example be designed as a pressure-controlled slide valve, but other valve types, such as seat or ball valves can be used. The actuation of the valve may alternatively be done by other actuators, such as magnets or fluid piston. A manual actuation of the valve is conceivable.

According to one embodiment of the pump unit according to the invention, the liquid ring pump is multi-stage, preferably formed in two stages. In this case, the liquid ring pump may comprise a second working space which communicates via a second control disk with a pressure opening and in which a second impeller is arranged, wherein the second working space is rotationally offset relative to the first working space. This can be distributed more uniformly by the eccentric arrangement of the impeller in the pump housing resulting forces, so that further storage of the drive shaft on the groundbreaking side of the drive motor side of the pump housing is no longer required and also in the two-stage pump a block design is made possible in which the pump housing is flanged directly to a drive motor or a bearing block. The term "rotationally offset" in the present context means the following: The longitudinal axis of the drive shaft, on which the two wheels are arranged rotationally fixed, is identical in both working spaces. The second working space is now rotated relative to the first working space, that the respective eccentricities are oriented differently in the radial direction. In the case of commonly used hollow cylindrical work spaces, this means at the same time that the longitudinal axes of the two work spaces are offset from each other.

Advantageously, the second working space will be rotated relative to the first working space such that a vector directed from the center of the first working space to the center of the drive shaft is rotationally offset by an angle between 150 ° and 220 ° with respect to a vector directed from the center of the second working space to the center of the drive shaft , For as far as possible compensation of the radial forces acting on the shaft, the angle is preferably about 180 °. A much more compact design of the inventive two-stage liquid ring pump can achieve when the angle of rotation to the two Workrooms are rotationally offset, between 180 ° and 210 ° and particularly preferably about 195 °. In such a rotational offset of the two working spaces can namely be dispensed with the provided in known two-stage liquid ring pumps between the two working spaces connecting space, so that the first working space is separated from the second working space only by a single control disc, in the present nomenclature as a "third control disc is referred to, although it, as seen in the conveying direction, is disposed between the first and second control disk. In this third control disk, a connecting slot is recessed, which simultaneously acts as a pressure slot of the first working space and as a suction slot of the second working space. Thus, only three control discs are required for this variant of the liquid ring pump according to the invention, while a conventional two-stage liquid ring pump in bearing carrier design requires four control discs. By eliminating the connection space and the fourth control disk, the liquid ring pump according to the invention in the axial direction can also be made much more compact, which further reduces the forces acting on the motor-side single bearing of the drive shaft and contributes to an additional noise reduction. Preferably, the connection slot in the first control disc separating the first working chamber has substantially the geometry of a conventional suction slot, ie the slot initially has a small width, which, as seen in the direction of rotation of the impeller, increases slowly. It has been found that such a geometry of the connecting slot in its capacity as a pressure slot of the first working space brings no disadvantages.

According to a preferred embodiment of the liquid ring pump according to the invention, the second and third control disk have no additional pressure ports, as they are known from the single-stage pump forth. Nevertheless, the delivery rate of the pump according to the invention is satisfactory even under different pressure conditions, so that neither a significant return flow nor an over-compression occur with excessive deviations from the optimal pressure conditions. The pump according to the invention is therefore relatively inexpensive to produce, since complex design measures, as they are associated with ventilbeaufschlagten additional pressure openings omitted. Preferably, the two working spaces are formed substantially as a hollow cylinder with a circular cross-section. The drive shaft with the non-rotatable attached wheels is then guided eccentrically through the work spaces. But it is also possible to realize the eccentric arrangement of the impeller by a special shape of the working space, for example by an ellipsoidal shape. If the working space has an elliptical cross-section, as is the case with double-acting pumps, the center of the ellipse can also lie on the axis of the drive shaft.

The two work spaces can have different shapes. But particularly advantageously, the pump housing has a total of a substantially cylindrical general shape and the staggered work spaces are recessed in segments of the pump housing with identical outer diameter.

In the third stage may also be provided as an internal cavitation protection hole. Alternatively or additionally, the pump housing may also have a compressed air connection as external cavitation protection.

The liquid ring pump is preferably formed in the pump unit according to the invention in block construction, wherein the pump housing is flanged directly to the drive motor.

In the two-stage embodiment of the pump, no special gas seal is required between the pump stages, since the gas seal is in operation by the operating fluid forming the liquid ring. In particular, in the embodiments in which the connection unit is designed as a connection housing, in which the liquid ring pump can be used as a plug-in unit, any leaking operating fluid is not a problem because it can be collected in the terminal housing and returned.

The pump unit according to the invention is suitable for a wide variety of applications, in particular applications in which compact design and ease of maintenance are particularly important. A typical application is the use as a compact system for sterilizers. In the pump unit are all components such as vacuum pump, separator, condenser and optional Heat exchanger already cased together. All you have to do is connect the process connections and the system is ready for use.

The invention will be explained in more detail below with reference to embodiments illustrated in the accompanying drawings.

Fig. 1

eine schematische perspektivische Darstellung einer ersten Ausführungsform des erfindungsgemäßen Pumpenaggregats mit einstufiger Flüssigkeitsringpumpe;

Fig. 2

das Pumpenaggregat der Fig. 1 im Teilschnitt entlang der Linie II-II;

Fig. 3

die Pumpe der Fig. 1 im Teilschnitt entlang der Linie III-III;

Fig. 4

eine schematische perspektivische Darstellung einer zweiten Ausführungsform des erfindungsgemäßen Pumpenaggregats mit zweistufiger Flüssigkeitsringpumpe;

Fig. 5

die als Einschubeinheit ausgebildete Flüssigkeitsringpumpe des Pumpenaggregats der Fig. 4;

Fig. 6

das Anschlussgehäuse des Pumpenaggregats der Fig. 4;

Fig. 7

das Anschlussgehäuse mit eingesetzter zweistufiger Flüssigkeitsringpumpe des Pumpenaggregats der Fig. 4 im axialen Längsschnitt;

Fig. 8

eine Detaildarstellung des ersten Flüssigkeitsabscheiders aus Fig. 7;

Fig. 9

eine Draufsicht auf den Flüssigkeitsabscheider der Fig. 8;

Fig. 10

einen Querschnitt des Pumpenaggregats der Fig. 4 entlang der Linie X-X;

Fig. 11

eine schematische Darstellung der Medienführung von der ersten zur zweiten Pumpenstufe des Pumpenaggregats der Fig. 4 in der Draufsicht auf die erste und zweite Pumpenstufe;

Fig. 12

eine Draufsicht auf die Innenseite der druckseitigen Steuerscheibe 147 und des sich anschließenden ersten Flüssigkeitsabscheiders 128 der zweiten Pumpenstufe des Pumpenaggregats der Fig. 4;

Fig. 13

eine Detailansicht des Steuerventils zur Steuerung der Kondensation des Pumpenaggregats der Fig. 4;

Fig. 14

zeigt eine Draufsicht auf die Stirnfläche der Anschlusseinheit 112 der Fig. 6; und

Fig. 15

einen Längsschnitt der Anschlusseinheit der Fig. 14 entlang der Linie XV-XV.

In the drawings show:

Fig. 1

a schematic perspective view of a first embodiment of the pump unit according to the invention with single-stage liquid ring pump;

Fig. 2

the pump unit of Fig. 1 in partial section along the line II-II;

Fig. 3

the pump of Fig. 1 in partial section along the line III-III;

Fig. 4

a schematic perspective view of a second embodiment of the pump unit according to the invention with two-stage liquid ring pump;

Fig. 5

designed as a plug-in unit liquid ring pump of the pump unit of Fig. 4 ;

Fig. 6

the connection housing of the pump set the Fig. 4 ;

Fig. 7

the connection housing with inserted two - stage liquid ring pump of the pump set the Fig. 4 in axial longitudinal section;

Fig. 8

a detailed view of the first liquid separator Fig. 7 ;

Fig. 9

a plan view of the liquid separator of Fig. 8 ;

Fig. 10

a cross section of the pump unit of Fig. 4 along the line XX;

Fig. 11

a schematic representation of the media guide from the first to the second pump stage of the pump unit of Fig. 4 in the plan view of the first and second pump stage;

Fig. 12

a plan view of the inside of the pressure-side control disc 147 and the subsequent first Flüssigkeitsabscheiders 128 of the second pump stage of the pump unit of Fig. 4 ;

Fig. 13

a detailed view of the control valve for controlling the condensation of the pump unit of Fig. 4 ;

Fig. 14

shows a plan view of the end face of the connection unit 112 of Fig. 6 ; and

Fig. 15

a longitudinal section of the connection unit of Fig. 14 along the line XV-XV.

In Fig. 1 is a generally illustrated by the reference numeral 10 first embodiment of the pump unit according to the invention shown. The pump unit 10 comprises a liquid ring pump 11 and a connection unit 12, which is formed in the illustrated embodiment as a connection housing 13 which surrounds a part of the pump housing 14. The pump housing 14 is detachably flanged to the connection unit 12, 13 flanged.

As one particular the representation of the Fig. 2 takes, the liquid ring pump 11 a surrounded by the pump housing 14 working space 15, in which a non-rotatably connected to a drive shaft 16 impeller 17 is arranged eccentrically. The working space 15 is frontally bounded by a control disk 18 in which a suction port 19 is recessed. The connection unit has a suction nozzle 20, which communicates with the suction opening (19) of the liquid ring pump via a connecting space 21 delimited by the connection unit.

The liquid ring pump 11 also has, in a manner known per se, a drive motor 22 which is connected to the drive shaft 16. One recognizes in the Fig. 1 and 2 In any case, a control unit 23 for the drive motor 22. The connection unit 12 also has a releasably attached to the end face 24 of the connection unit 12 flanged heat exchanger 25, which serves in the illustrated example for cooling the operating fluid of the liquid ring pump. For this purpose, the connection unit has an inlet connection 26 and an outlet connection 27 for a cooling medium, which in the interior of the connection unit 12 via corresponding, in the Fig. 1 and 2 not shown connecting openings is passed into the heat exchanger 25.

How to get in Fig. 3 detects the pump unit 10 on the pressure side, a first liquid separator 28. The liquid separator 28 has annular housing ribs 29, which surround the pressure openings 30 in the control disk 18 in such a way that the mixture exiting via the pressure openings 30 is guided in a rotational movement, so that liquid can be deposited on the housing ribs 29, while the gaseous components of the Fluid mixture with residual liquid via a gap 31 in a recessed in the connection unit Space 32 can flow. In the example shown, the pump unit is provided with a two-stage separator, so that the fluid mixture can pass from the intermediate space 32 through openings 33 in the downstream second separator stage 34, which is designed as a gravitational separator. In the second separator stage 34, the fluid mixture is calmed and passed over a plurality of baffles, so that the largely freed from liquid fractions gas can escape via an outlet opening 35 into the environment. The outlet opening 35 may have a connecting piece (not shown) to which, for example, a silencer and / or an exhaust pipe can be attached.

In the FIGS. 4 to 15 a second embodiment of the pump unit according to the invention is shown, in which components which have the same or a comparable role as in the embodiment of Fig. 1 to 3 play, but with the same reference numerals increased by 100. These components are not explained in more detail below.

It shows Fig. 4 a schematic perspective view of the pump assembly 110 according to the invention, which is equipped in this embodiment with a two-stage liquid ring pump 111. The liquid ring pump 111 is inserted as a plug-in unit into the connection unit 112 designed as a connection housing 113. In this example, the connection housing 113 of the pump unit 100 not only has a heat exchanger 125 for the operating fluid, but also a capacitor 140 for the fluid to be delivered, which is connected upstream of the suction port of the liquid ring pump. The intake manifold 120 is disposed directly on the capacitor 140 in the illustrated example. However, it could alternatively be provided on the connection housing 113. The condenser 140 also has connection stubs 141, 142 for a cooling medium. Correspondingly, connection pieces 126, 127 for the cooling medium are provided on the heat exchanger 125. Both the condenser 140 and the heat exchanger 125 are designed as releasably flangeable modules, which can be attached to the connection housing 113 as needed.

In Fig. 5 is formed as a plug-in unit liquid ring pump 111 of the pump unit 110 of Fig. 4 in one of the terminal housing 113th pulled out state shown. In this illustration, one also recognizes the suction opening 119 of the liquid ring pump 111, which communicates in the installed state through the connection housing 113 with the suction nozzle 120. The suction opening is located at the level of a (not visible in the figure) suction slot in the first control disk 118. Furthermore, the cylindrical general shape of the pump housing is clearly visible, whereby the pump 111 can be particularly easily installed as a plug-in unit in the connection housing 113.

In Fig. 6 In turn, the connection housing 113 is shown separately, without a built-in liquid ring pump and without the mounted on the end face 124 of the connection housing capacitors 140 and heat exchanger 125. If no heat exchanger is also to be used during operation, one of the closable openings 120a, 120b of the connection housing 113 can serve as intake manifold as an alternative to the intake connection 120.

Fig. 7 shows the connection housing 113 of the pump unit 110 of Fig. 4 with inserted liquid ring pump 111, however - for better clarity - without the flanged and connected to the drive shaft 116 drive motor 122, in axial longitudinal section.

How to particular the FIGS. 5 and 7 can be removed, the liquid ring pump 111 is formed in two stages in this embodiment. The pump housing 114 consists of a first annular segment 143, which surrounds the first working space 115 with the first impeller 117 arranged therein, and a second annular segment 144, which surrounds the second working space 145. In the second working chamber 145, a second impeller 146 is disposed on the same drive shaft 116. The second working space 145 is limited on the pressure side by a second control disk 147, in which (not recognizable in the figures, but known per se) pressure openings are recessed. Between the first working space 115 and the second working space 145 there is a single third control disk 148. The second working space 145 is rotationally offset from the first working space 115 by an angle of 195 ° (see also FIG Fig. 11 ). As a result, a connection space provided between the two work spaces can be dispensed with, so that the first work space 115 of the second work space 145 only by the third Control disc 148 is separated, in which a connection slot 149 (see Fig. 11 ), which simultaneously acts as a pressure slot of the first working space and as a suction slot of the second working space. For this variant of the pump unit according to the invention so only three control discs are needed, while a conventional two-stage liquid ring pump in bearing carrier design requires four control discs. By eliminating the connection space and the fourth control disk, the liquid ring pump 111 can also be made much more compact in the axial direction, which further reduces the forces acting on the motor-side single bearing of the drive shaft and contributes to an additional noise reduction. In the illustrated two-stage embodiment of the liquid ring pump no special gas seal is required between the pump stages, since the gas seal is made in operation by the operating fluid forming the liquid ring.

In the second control disk 147, which closes the second working space 145 on the pressure side, is a (in Fig. 7 unrecognizable, but for example in the Figures 10 . 11 and 12 shown) pressure slot 150, which opens into a first liquid separator 128. In this second embodiment, the first liquid separator 128 is disposed between the liquid ring pump 111 and the drive motor 122.

The first liquid separator 128 is formed as a cyclone and in the FIGS. 8 and 9 shown. It shows Fig. 8 an axial longitudinal section corresponding to Fig. 7 along the line VIII-VIII of the Fig. 9 , The Fig. 9 itself shows a plan view of the liquid separator of Fig. 8 , The liquid / gas mixture emerging from the pressure slot 150 of the second working space 145 is directed in a circular path into an interior 151 of the first separator 128, which is divided axially into two levels by an annular separating plate 152. The liquid which separates out in the outer region of the interior 151 is discharged via a drain 153 in the bottom region of the separator 128, while the gas with any remaining liquid in the central region of the interior 151 is conveyed further in the direction of the drive motor 122, before the gas is then deflected radially so that it can pass through openings 154 of the first liquid separator 128 in an annular space 155 which between the outer wall of the pump housing 114 and the inner wall of the Connection housing 113 is recessed. In addition, a channel is provided in the first liquid separator 128 which has an opening 156 which opens into the annular space 155 and an opening 157 which leads into the interior 151. The opening 156 is at the level of a recessed in the second control disk 147 bore 158, so that a connection between the annulus 155 and the second working chamber 145 of the liquid ring pump 111 is made, which serves as Kaviationschutz (see also Fig. 10 ). In addition, the pump housing can also have a compressed air connection as external cavitation protection.

Fig. 10 shows a cross section of the pump unit of Fig. 4 along the line XX the Fig. 4 , One recognizes the second working space 145 of the liquid ring pump 111 with the second impeller 146 and the pressure-side second control disk 147, in which the opening into the first separator 128 first pressure slot 150 and the Kavitationsschutzbohrung 158 are recessed. Also in this embodiment, the separator is formed in two stages. The first liquid separator again has at least one outlet opening for the fluid to be delivered, which opens into a space provided in the connection unit, which forms a connection between the first separator and a second, downstream separator. In the present exemplary embodiment, the gas emerging from the first cyclone separator 128 from the openings 154 passes via a space formed as annular space 155 into a second separator 134, which is again designed as a gravitational separator, where the fluid flow is calmed and slowed down by deflecting plates 156, so that may deposit residual liquid contained in the fluid stream. The largely liquid-free gas can then leave the pump unit 110 via the discharge opening 135.

In Fig. 11 is the media guide from the first to the second pump stage of the pump unit the Fig. 4 illustrated by way of example with reference to a plan view of the first and second pump stage in more detail. For better clarity, the third control disk 148, which is arranged between the first working space 115 and the second working space 145, has been omitted. Only the recessed in the third control disc 148 connecting slot 149 is in Fig. 11 shown in dashed lines. In this plan view, the two wheels 117, 146 are one above the other and one looks at the second control disk 147, which the second working space 145th on the pressure side. As can be seen particularly well in this illustration, the second working space 145 is rotationally offset relative to the first working space 115. The longitudinal axis of the drive shaft 116, on which the two wheels 117, 146 are arranged rotationally fixed, is identical in both working spaces. The second working space 145 is rotated relative to the first working space 115 such that the respective eccentricities are oriented differently in the radial direction. Thus, the eccentric arrangement of the wheels 117, 146, the forces occurring in the pump housing 114 can be distributed more evenly, so that further storage of the drive shaft on the side facing away from the drive motor 122 side of the pump housing is no longer required.

Fig. 12 is a plan view of the inside of the pressure-side control disc 147 and the subsequent first Flüssigkeitsabscheiders 128th

In front of the suction opening 119 of the pump housing 114 of the liquid ring pump 111 is in connection unit 112 in Fig. 13 arranged in more detail valve 160 for controlling the condensation of contained in the fluid to be delivered vapor. The valve 160 is designed as a slide valve and is actuated by a piston 161 which is operated by compressed air. For this purpose, the connection housing 112 has a compressed air connection 162 (see also Fig. 4 ). When starting the pump, the suction port 119 is closed via a valve plate 163 of the valve 160 to allow in the upstream condenser 140 a substantial condensation of vapor contained in the fluid mixture. In the valve plate 163, a hole 164 for the condensate drain in the direction of the first stage of the liquid ring pump is recessed.

In the FIGS. 14 and 15 For example, the front end of the connector unit 112 is shown in more detail. Fig. 14 shows a plan view of the end face 124 of the connection unit 112 of Fig. 6 and Fig. 15 is a longitudinal section along the line XV-XV of Fig. 14 , The connections 120a, 120b for the fluid to be conveyed into the condenser 140 or the connections 165, 166 for the operating fluid in the heat exchanger 125, as well as in connections 126, 127 and 141, 142 for the cooling water are in the form of a continuous flow or a open or closed circulation cooling configurable. In the example shown, in which the cooling water connection to the Heat exchanger or the capacitor are provided directly, the terminals 141a, 142a and 126a, 127a are closed at the end face 124 and sealed only possibly provided on the back of the capacitor and the heat exchanger openings. But they can also be opened to configure a modified cooling circuit, for example, when cooling liquid nozzles are arranged on the connection unit.

Claims (15)

Pump unit (10,110), which comprises a pump, in particular a liquid ring pump (11,111), and a connection unit (12,112), wherein the pump (11,111) has a pump housing (12,112) surrounding a first working space (15,115), via a first Control disc (18,118) communicates with a suction port (19,119) for a fluid to be delivered and in which a first non-rotatably connected to a drive shaft (16,116) impeller (17,117) is arranged eccentrically,
characterized,
in that the pump (11, 11 1) is detachably connected to the connection unit (12, 112) and in that the connection unit has an inlet (20, 120) communicating with the suction opening (19, 119) of the pump (11, 11), the connection unit (12, 12) acting as a connection housing (13, 13) ) is formed and the liquid ring pump (11,111) is detachably mounted as a plug-in unit in the connection housing (13,113). Pump unit according to claim 1, characterized in that the liquid ring pump (11,111) is designed as an axial plug-in unit, wherein the pump housing (14,114) preferably has a substantially cylindrical general shape. Pump unit according to one of claims 2 or 2, characterized in that the liquid ring pump (11,111) on the pressure side has an integrated first liquid separator (28,128), wherein the first liquid separator (28,128) is preferably a cyclone separator. Pump unit according to claim 3, characterized in that the integrated first liquid separator (28, 128) is arranged in the connection unit (12, 112). Pump unit according to claim 3, characterized in that the integrated first liquid separator (28,128) between the pump housing (14,114) and a drive shaft (16,116) driving motor (22,122) of the liquid ring pump (11,111) is arranged. Pump unit according to one of Claims 3 to 5, characterized in that the integrated first liquid separator (28, 128) has at least one outlet opening (154) for the fluid to be delivered, which opens into an intermediate space (32, 155) provided in the connection unit (12, 12) in which the intermediate space (155) is preferably recessed between the pump housing (114) and the connection housing (113). Pump unit according to claim 6, characterized in that the connection unit (12,112) comprises a second liquid separator (34,134) which communicates with the space provided in the connection unit (12,112) gap (32,155), wherein the second separator (34,134) is preferably a gravitational separator. Pump unit according to one of Claims 1 to 7, characterized in that the connection unit (12, 12) has a condenser (140) for the fluid to be conveyed, the condenser preferably being arranged between the suction connection (142) of the connection unit (112) and the suction opening (119). the pump housing (114) is arranged, wherein the connection unit (112) particularly preferably comprises an inlet pipe (141) and an outlet pipe (142) for a cooling medium of the condenser (140). Pump unit according to claim 8, characterized in that the condenser (140) is detachably mounted on the connection unit (112). Pump unit according to one of claims 1 to 9, characterized in that the connection unit (112) has a heat exchanger (25,125) which communicates with the operating fluid of the liquid ring pump (11,111), wherein the connection unit (12,112) preferably an inlet port (26,126) and a Exhaust port (27,127) for a cooling medium of the heat exchanger (25,125) comprises. Pump unit according to claim 10, characterized in that the heat exchanger (25,125) is detachably mounted on the connection unit (12,112). Pump unit according to one of claims 1 to 11, characterized in that in the connection unit (112) between the suction port (142) of the connection unit (112) and the suction opening (119) of the pump housing (114), a valve (160) for controlling the condensation of steam contained in the fluid to be delivered is arranged, wherein the valve (160) is preferably designed as a pressure-controlled slide valve and preferably has a throttle bore (164). Pump unit according to one of claims 1 to 12, characterized in that the liquid ring pump (111) is formed in several stages, preferably two stages. Pump unit according to claim 13, characterized in that the liquid ring pump (111) comprises a second working space (1145) which communicates via a second control disk (147) with a discharge nozzle and in which a second impeller (146) is arranged, wherein the second working space ( 145) is rotationally offset relative to the first working space (115), wherein the first working space (115) is preferably separated from the second working space (145) only by a single, third control disk (148) in which a connecting slot (149) is recessed, which simultaneously acts as a pressure slot of the first stage and as a suction slot of the second stage, wherein in the third control disc (148) is preferably provided a bore as an internal cavitation protection. Pump unit according to one of claims 1 to 14, characterized in that the liquid ring pump (11,111) is formed in block construction, wherein the pump housing (14,114) directly to a drive motor (22,122) is flanged.

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