DE102005039612A1 - Eccentric spiral pump for use in food industry, has connection unit connecting rotor units and covering unit in torque-proof manner, where connection unit is installed in position separated from interior of pump housing by covering unit - Google Patents

Abstract

The pump has two rotor units (10, 11) supported in a rotating manner, a drive unit (9), and a pump housing, where the rotor units are connected with one another. A connection unit (20) is provided for connecting the rotor units and a covering unit in a torque-proof manner. The connection unit is installed in a position that is separated from an interior of the pump housing by utilizing the covering unit.

Description

The The invention relates to an eccentric screw pump with a pump housing, in a rotor unit is rotatably mounted, the at least two Comprises rotor elements such as a worm rotor and a drive element, according to the preamble of claim 1.

In In recent decades, the progressing cavity pump has its many uses proven and thus a permanent place in the pump market secured. An important area of application is food technology. There, the eccentric screw pump technology has established itself and is For medium-oriented use a reliable working device.

in the The scope of the automation, which is also progressing in the food industry entire process lines, adapts to the used conveyor technology always new requirements in terms of continuous operation. Here are particularly high demands on the medium-friendly advancement and the hygiene of the pumping system.

The The progressing cavity pump offers many advantages when viscous and sensitive media are to be promoted. The generally as catchy Screw executed Rotor rotates, over the propeller shaft connected to the drive, in a usually two-speed stator. The cyclically opening and closing chambers due to the path differences suck in the medium. In the closing chamber it becomes towards Promoted and printed page in the plant part with higher Pushed out pressure. If selected, e.g. of chamber size, pump speed and component materials can be achieved that contained in the fluid, soft pieces, such as. Cherries in yogurt, unscathed to pass the pumping system.

The Pumping system must meet high demands for gentle promotion the media and the cleaning of the entire system. in this connection allowed to no quality losses be generated by the pumping system and possibly existing dead space have to freed from residues and the entire system must in special cases, for example by means of superheated steam, be formed aseptically. This is generally beside the Application of food technology z.T. also for others use cases of relevance.

Appropriate Eccentric screw pumps become common motor, in particular driven by an electric motor. Between the Motor and the rotor, for example, used as a rotor element Cardan joint or the like arranged. The universal joint is beyond that in the flow direction of the conveyed medium behind the inlet opening of the pump housing and inside the pump housing arranged so that this comes into contact with the medium and thus if necessary is to be cleaned accordingly.

Often point commercial Progressing cavity pumps a modular design, in particular a drive module with the drive shaft, a module, in particular the propshaft or the like and the inflow opening comprises, a Rotor module with the rotor and an outlet module with the discharge opening of the pump housing is provided. In accordance with modular design of the eccentric screw pump is particularly advantageous that, for example, the rotor module the appropriate application is customizable, in particular the length the rotor and / or the conveyor cross section, the formation of chamber sizes, the Component materials etc. are variable. The same applies also regarding the other modules too, leaving big Performance areas and countless use cases are feasible.

At the The prior art have corresponding rotationally fixed connections between the rotor elements a comparatively complex geometry, on the one hand dead spaces and on the other hand produce deposition areas for the pumped medium, so that the hygiene, in particular with a change of the conveyed medium, can not be guaranteed for sure can.

at Partial cavity pumps currently on the market are partial already common, the non-rotatable connections of the rotor elements with a plug or pin connection to realize. This means that the universal joint with both the Drive shaft of the pump and rotatably with the rotor accordingly connected is.

adversely in the hitherto conventional connection technology is, however, that in operation, the pin connection of the rotor elements can solve allowing the pumping of the fluid is impaired. Among other things, this is not tolerable in the food industry.

Task and advantages of Invention:

The object of the invention is in contrast, an eccentric screw with a pump housing in which a rotor unit is rotatably mounted, the at least two rotor elements as a Worm rotor and a drive element comprises, wherein the rotor elements are rotatably connected to each other to suggest, with a release of the rotationally fixed connection of the rotor elements is effectively prevented.

These Task is, starting from an eccentric screw the introductory mentioned type, by the characterizing features of claim 1 solved. By the mentioned in the dependent claims activities are advantageous embodiments and further developments of the invention possible.

Accordingly is an eccentric screw pump according to the invention characterized in that a connection element for the rotationally fixed connection the two rotor elements and a cover element are provided, wherein the connecting element in the mounted position by the Cover is separated from the interior of the pump housing.

With Help of the connecting element according to the invention and cover is advantageously a releasable, non-rotatable Connection of the two rotor elements feasible, with an adverse, automatic release of the Connection is reliably prevented. In addition, through a advantageous embodiment of the cover or its shape, a comparatively easy to clean, especially dead space or realized dead space-free connection of the two rotor elements become.

Basically advantageous to make the selection of materials such that depending on the application, especially in the food industry, no Adverse contamination of the pumped medium takes place. For example, in the food sector are exclusively food safe or approved materials such as corresponding stainless steels, natural rubber, etc. to use. Preferably, the materials have a comparatively high temperature resistance on, so that the pump or the rotationally fixed connection with the help of superheated steam or the like is cleanable. Furthermore, it is a chemical resistance advantageous, so that on the one hand pumped corresponding media and on the other hand corresponding cleaning agent to no impairment of the compound of the invention or Lead the pump can.

According to the invention In particular, the advantageous cover element has two functions on, so that on the one hand, the connection element from the interior or from the pump room the pump housing effectively be disconnected and on the other hand, the connection element is not automatic can solve. The means that the connection element by the cover captive is stored. As a result, on the one hand the reliability of the Eccentric screw pump according to the invention decisively increased and above In addition, the ease of cleaning or hygiene requirements in Compared to the prior art significantly improved or better fulfilled.

In a particular embodiment of the invention is at least one Seal for sealing the connection element with respect to the Interior of the pump housing intended. With the help of this measure is guaranteed that a penetration or infiltration or the like of the cover in the interior of the connection region or under the cover safely through the fluid is prevented. This additionally improves the ease of cleaning the compound of the invention, whereby particularly high hygienic quality requirements can be achieved are.

For example is the seal according to the invention as a labyrinth seal, in particular with one or more labyrinth seal grooves educated. Advantageously, the dimensions of the Labyrinth seal adapted to the viscosity of the pumped medium. at A labyrinth seal is advantageous in that no foreign material can get into the fluid through abrasion or the like.

Preferably at least one particular separate sealing element is provided, in an advantageous manner between the cover and at least one of the rotor elements is arranged. A sealing element according to the invention ensures a particularly good and reliable sealing of the cover across from the interior or delivery room of the pump housing. As a result, the reliability or the degree of avoidance further improved by hygienic contaminants. For example, the sealing element is an elastically deformable sealing element educated. In addition to a wide variety of materials is an elastomeric material for the Sealing element particularly advantageous.

In an advantageous embodiment at least two seals for double-sided sealing of the invention the end regions or the edge regions of the cover provided. This means that viewed in the axial direction, at least both Ends of the cover are sealed. This will make the seal the connection element or the rotationally fixed connection with respect to the Interior or delivery room of the pump housing guaranteed especially safe.

In a particular variant of the invention, the cover element only covers an angle range smaller than 360 degrees (relative to the direction of rotation). In this embodiment, a seal of the cover is throughout Edge area of advantage. This means that both the axially oriented end portions and the two oriented in the direction of rotation end portions of the cover, in particular without interruption, are sealed.

Basically advantageous, at least one seal on at least one edge portion and / or a full-scale To arrange edge or one end of the cover. Preferably is on both edge portions and / or fully on both edges or Ends of the cover each provided at least one seal. This can effectively prevent the formation of a dead space for the medium to be pumped or it will be ensured that possible no infiltration of the medium to be pumped under the cover can take place.

In A preferred variant of the invention is at least one recess of the cover for provided the seal. Advantageously, the recess is on at least one edge portion and / or a full-circumference edge or one end or at both edge sections and / or in full both edges or ends of the cover provided. This is the seal the cover further improved.

In Advantageously, the recess can be formed in such a way that the seal engages behind the cover or the seal viewed in the radial direction at least partially within the Cover element is arranged.

As a general rule is advantageous, the seal according to the invention so advantageous form a hermetic seal of the connection element across from the interior or delivery room of the pump housing is realized.

In A preferred variant of the invention is at least one sealing element designed as an O-ring with a Nutsitz. A correspondingly realized seal on the one hand is particularly easy to produce and on the other hand can on already commercially available O-rings resorted become. This is an economically particularly favorable implementation the invention possible. Corresponding O-rings are for applications in the food industry also from food-safe materials available.

Of the Nutsitz invention For example, by machining methods such as turning or the like. The corresponding groove can for example, in at least one of the rotor elements and / or in the cover are molded.

Preferably is the Nutsitz by the marginal outer surfaces of the interconnecting Rotor elements when joining together train. A corresponding realized Nutsitz is special easy to produce. For example, one of the rotor elements a aligned in the direction of the axis of rotation flat outer surface and the other or adjacent rotor element has a rotation axis direction formed graduation or notching, preferably in the peripheral area, on. As a result, in a particularly simple manner, a U-shaped Nutsitz realized. At the same time hereby in addition to the sealing of the cover also a sealing of the contact surfaces of the realized two rotor elements.

advantageously, is at least one sealing element in the closed position of Cover element pressed so that the Nutsitz completely without Edge gap is closed. This measure ensures that that through the seal or the Nutsitz no dead space or no relatively bad to be cleaned space or gap is formed. This will be particularly high hygienic requirements, especially in the food industry fulfilled.

Preferably clamps the sealing element by pressing between the rotor element and cover the cover in its closed position and / or the sealing element has in the closed position of Covering element at least partially an outer diameter and / or a supernatant on that bigger than the inner diameter of the cover is. With the help of at least one of these features of the invention is an advantageous fixation of the cover in the closed Position feasible. As a result, for example, the automatic adjustment or release the cover member from the closed position effectively prevented. This increases the security of the connection.

Furthermore can the supernatant or the compression of the sealing element in the direction of the axis of rotation realized behind grasping the cover, so that a form-fitting Fixation is realized. This additionally improves the security of the connection.

advantageously, is the sealing element elastic, in particular spring-elastic, so at least temporarily during the assembly / disassembly of the cover element, the sealing element e.g. a smaller volume or shape than in the original one Condition and / or in the compressed state or in the closed Has position of the cover.

In such a compressed sealing element or by the supernatant of the invention Sealing element ensures secure fixation of the connection and at the same time the solubility of the cover securely in operation. A correspondingly secured cover element can be achieved in the case of an elastomeric O-ring exclusively by a continuous, long-lasting action of a peel force from the closed position. In operation, however, such a steady loading of the cover or the seal is excluded. In operation, a corresponding seal or the sealing element by the rotation of the rotor elements alternately or cyclically loaded, wherein the resistance of the sealing element according to the invention can not be overcome.

Preferably is at least one of the sealing elements as a sealing sleeve or sealing cuff or the like formed. This means in particular that the sealing element at least partially sleeve or sleeves extends in the direction of the axis of rotation. This will be advantageous Way the sealing function of the sealing element expandable.

Furthermore can the sealing element or the sealing sleeve at the same time a protective function or such as e.g. in particular, of the section covered by this section realize the rotor element and / or the cover.

As a general rule is a sealing sleeve or sealing cuff or the like can be formed, according to the above Explanations on the one hand between the cover and one of the rotor elements is arranged and / or on the other hand on the cover and / or over extends a portion of the rotor element.

In front especially in the variant in which the sealing element or the sealing sleeve or sealing cuff or the like between the cover and a the rotor elements is arranged, the sealing element or the Sealing sleeve advantageously clamped or fixed.

advantageously, is the sealing sleeve or sealing cuff or the like as a separating element for separating at least a portion of the rotor element from Interior of the pump housing educated. This allows special sections of the corresponding rotor element in front of a Protected against contact with the equipment to be pumped and / or the pumping equipment or the interior of the pump housing before a contact with the rotor element and / or an adjuvant, such as e.g. Lubricants or the like, are effectively protected. This is especially true in pharmaceutical, food applications or similar Applications of very particular advantage. An appropriate cleaning the pump according to the invention is thereby significantly improved or simplified.

For example can in through the sealing sleeve or sealing cuff or the like preferably completely separated and e.g. as a joint, in particular as a cardan joint, trained portion of the rotor element lubrication with grease be realized without this get into the interior of the pump housing or without contaminating the equipment to be pumped can. In addition, this ensures that e.g. the joint or universal joint Can be operated in a fat pad, so that the life of the joint significantly extended becomes.

In A preferred variant of the invention is the sealing collar or sealing cuff or the like between two cover elements arranged. This is on the one hand ensures that the sealing sleeve or sealing cuff or the like in an advantageous manner to at least two places and / or at both ends securely fixable.

on the other hand is hereby a sealing sleeve or sealing cuff or the like realized, which is essentially about an entire rotor element extends, wherein the rotor element preferably at both ends, e.g. each with the aid of a rotationally fixed connection according to the invention attached with a connection element and a separate cover is. This can be used as a joint, in particular as a cardan joint, trained rotor element almost completely from the sealing sleeve or Sealing cuff or the like are covered or painted over. This ensures a complete Separation of the rotor element or joint from the interior of the pump housing.

Preferably has the sealing sleeve or sealing cuff or the like means auf, which as a thickening or broadening, in particular such. an O-ring are formed and / or such. an O-ring in particular arranged in an advantageous Nutsitz or introduced and preferably fixed can be. For example, at least one end of the sealing sleeve or Sealing cuff or the like according to or in the manner of an O-ring educated.

advantageously, are the means of the sealing sleeve or sealing cuff or the like arranged at the edge or end of the cover member according to the invention. This ensures that that possible no infiltration of the medium to be pumped under the cover can take place.

In an advantageous variant of the invention, at least one rotor element has a guide section, the outer diameter of which is smaller than the inner diameter of the cover element that this is axially displaceable in particular along the guide portion. As a result, during assembly of the non-rotatable connection or of the cover element, this can be adjusted or guided axially from an open position, in particular after assembly of the two rotor elements, into the closed position. In this case, the cover element is advantageously arranged in the open position in the region of the guide section or in the radial direction on the outside of the guide section. Accordingly, the cover member for releasing the connection from the closed position on the guide portion can be moved to the open position.

Basically in the open Position of the cover an access to the connection element or to the connection surfaces the two rotor elements guaranteed. Leading to that in the open Position of the cover the assembly or disassembly of the connection element or the non-rotatable connection is particularly easy to implement.

The Covering element may in a particular embodiment of the invention as Cover or the like can be formed. For example, overrides the cover in this case only a portion of the circumference the rotor elements, i. the cover comprises in this variant a viewed in the direction of rotation angle range less than 360 degrees.

In a preferred embodiment the invention, the cover is designed as a cover. The cover sleeve is especially as a closed sleeve formed on the circumference of this, so that the cover sleeve a has closed, particularly stable or rigid ring shape. The means that the cover is designed as a hollow cylinder. This will change the length or shape of the outer edge the cover minimized or simplified, which is an advantageous Sealing of the cover or the rotationally fixed connection allows.

Furthermore the production of a cover sleeve is particularly easy to implement, which further improves the economy of the invention.

In a particular embodiment of the invention is covered Connection element designed as a bar, which connects the Rotor elements at least partially interspersed. With the help of a corresponding Locking element is an advantageous form-locking connection feasible, the big one on the one hand Torques and on the other hand is easily releasable. For example the bolt is designed as a bolt, screw, pin or the like.

advantageously, is the covered terminal a pin or the like, used in aligned holes of the rotor elements to be connected is. Corresponding holes and pins are particularly easy to produce, so that the production is particularly easy to implement.

As a general rule can the through the assembled Rotor elements formed recess for the connection element baggy or be realized as a blind hole, so that the connecting element einführbar only from one side into the recess or bore and is removable. In this variant, the recess in an advantageous Way at least partially formed as a threaded hole.

In an advantageous variant of the invention, the recess, the formed by the two composite rotor element, open on both sides educated. For example, the recess is a continuous, Transverse to the axis of rotation directed bore, so that the connecting element for example, introduced from one side and on the other side can be moved out. The adjustment of a correspondingly introduced Connection element is by pressurizing from one side particularly easy to implement. This is especially true for one designed as a pin or the like connecting element of particular advantage.

In a preferred embodiment The invention relates to the two rotor elements to be connected Worm rotor and a cardan shaft. Alternatively or in combination For this purpose, the rotor elements to be connected are a universal joint shaft and a drive shaft rotatably connected to the drive motor. Optionally, the two non-rotatable connections of the rotor elements or the Kardangelenkwelle largely identical with respect to the connection and covering and / or sealing elements designed so that the economy of the invention continues improved.

Preferably the drive motor is an electric motor, which among other things special is easy to control.

In principle, it is advantageous to design the eccentric screw pump according to the invention, including the drive motor, in a modular manner, so that the pump system can be adapted particularly flexibly to a wide variety of applications or requirements. For example, different lengths rotor units, different materials with respect to the rotor shaft and / or the rotor housing, different cross-sections of the pump or the rotors, different drive motors with different services, etc. are provided.

Embodiment:

One embodiment The invention is illustrated in the drawing and is based on the Figures in more detail below explained.

in the Individual shows:

1 a schematic plan view of an eccentric screw pump with electric motor according to the invention,

2 a schematic section through a part of the eccentric screw pump according to the invention,

3 a schematic detail view in section according to the 2 and

4 a schematic detail view in section with a sealing sleeve.

In 1 is schematically a pump 1 shown in plan view by an electric motor 2 is driven. The pump 1 has an inlet 3 or an inlet opening 3 and an outlet opening 4 or an outlet 4 on. The pump motor unit is modular, with the motor 2 as engine module 2 trained and a drive module 5 , a gimbal module 6 , a rotor module 7 and an outlet module 8th are provided. To adapt to a wide variety of applications, the modules 2 . 5 . 6 . 7 . 8th can be dimensioned in a variety of dimensions or with a wide variety of materials, etc., and, if appropriate, can be connected to one another in various ways.

In 2 is schematically a detailed section along the axis of rotation by the pump 1 shown in sections, wherein the section is 90 degrees relative to the top view according to 1 is turned. 2 includes in particular the module 6 in which as a rotor element according to the invention, a propeller shaft 9 and a rotor shaft 10 and a drive shaft 11 are provided. Without further explanation is the drive shaft 11 with the engine 2 rotatably connected.

2 illustrates in particular the formation of pumping chambers 12 between the rotor shaft 10 and a rotor housing 13 , The pump housing according to the invention comprises in addition to the rotor housing 13 in particular, a housing 14 of the gimbal module 6 ,

2 further illustrates the formation of connections 15 according to the invention. In this embodiment, the connection 15 according to the invention at the opposite ends of the propeller shaft 9 arranged.

To illustrate the connection 15 according to the invention, the compound 15 between the cardan shaft 9 and the rotor shaft 10 in 3 schematically illustrated, with further details are illustrated.

The connection 15 according to the invention comprises a cover sleeve 16 facing the propshaft 9 with the help of an O-ring 17 and an O-ring 18 is sealed. In addition, the O-ring takes 18 at the same time the function true, the two waves 9 and 10 or to seal their contact surfaces. Basically, this could also be two separate seals or O-rings are used and / or the sleeve 16 extend over the contact surfaces.

The O-ring 17 is in a U-shaped groove of the cardan shaft 9 inserted. The O-ring 18 is inserted in a U-shaped groove, which by juxtaposing or connecting the propeller shaft 9 with the rotor shaft 10 is realized.

Through the sleeve 16 as well as the two O-rings 17 . 18 becomes an interior 19 the pump housing against a pin 20 or connecting element 20 hermetically sealed according to the invention.

The pencil 20 is through aligned holes 21 and 22 the cardan shaft 9 or rotor shaft 10 arranged. This creates a rotationally fixed connection of the cardan shaft 9 with the rotor shaft 10 , As in 2 becomes clear, is also the connection 15 between the cardan shaft 9 and the drive shaft 11 executed accordingly.

3 also illustrates that the two O-rings 17 . 18 in the closed position of the sleeve 16 are pressed so that the corresponding groove are filled completely and in particular without edge gap.

In addition, the O-ring 18 pressed in this position in the corresponding groove such that a supernatant 23 of the O-ring 18 a larger diameter than an inner diameter of the cover sleeve 16 having. As a result, a positive fixation of the cover 16 through the O-ring 18 realized, so that a particularly secure fixation of the cover 16 in the closed position according to 3 he follows.

Furthermore, in 3 clearly that both the cover sleeve 16 as well as one of the two rotor elements 10 . 9 , in this case the cardan shaft 9 , in each case a stop surface for forming a stop 24 having. With the help of the stop 24 is advantageously ensured that the closed position according to 3 done in a defined manner. This in turn ensures the safety that the supernatant 23 of the O-ring 18 is trained.

In 4 a variant of the invention is shown in which, in contrast to the variants according to the 2 or 3 as a sealing element a sealing sleeve 26 is used.

The sealing cuff 26 consists essentially of an elastomer such as rubber or the like, and may in the illustrated case on the rotor element 9 or the universal joint 9 simply be slipped over. At the end, the sealing collar points 26 a thickening, which is essentially the O-ring 17 corresponds and can be introduced into the corresponding groove. As a result, a secure fixation of the sealing sleeve 26 and at the same time a secure sealing of the connection 15 or covering sleeve 16 guaranteed.

Without that being shown in more detail, the gasket can 26 have at both ends a thickening provided in the manner described above and between two compounds 15 are arranged and / or the section or eg the rotor element 9 between two connections 15 effectively separate from the interior. It can be a hermetically sealed area between two connections 15 be realized in an advantageous manner. As a result, for example, contamination of the rotor element 9 or the universal joint 9 Advantageously prevented by the pumping equipment. This improves the cleaning ability of the pump 1 or the comparatively complex-shaped universal joint 9 ,

On the other hand, the universal joint 9 be operated with a grease or the like, which significantly reduces wear and thus significantly extends the service life and improves maintenance.

In principle, according to the invention, it is advantageous that one of the rotor elements 9 . 10 . 11 each connection 15 a stop 24 of the cover 16 and the other rotor element 9 . 10 . 11 the connection 15 a guide section 25 having. In the in 3 variant shown, the rotor shaft 10 the corresponding guide section 25 on, because here the cardan shaft 9 the stop 24 includes. The guide section 25 has a smaller outer diameter than the inner diameter of the sleeve 16 on. As a result, for mounting the cover sleeve 16 it possible for this cover sleeve 16 , viewed in the axial direction, according to the closed position 3 respectively. 4 in an open position (without further illustration) can be adjusted or moved. This will be the supernatant 23 by a particular steady, uniform tensile load of the cover 16 overcome. This is the O-ring 18 , in particular, the O-ring 17 or the sealing sleeve 26 , deformable, in particular elastically deformable.

Without closer representation is through 3 respectively. 4 comprehensible that for dismantling the connection 15 the cover sleeve 16 can be moved to the not shown, open position, so that the pin 20 from the holes 21 . 22 can be taken out.

For example, for cleaning purposes and / or for repair or maintenance of the pump 1 may be a corresponding disassembly of the connection 15 be provided. In this case, in particular, the modular design of the pump 1 or the pump system 1 . 2 advantageous. The connections of the modules 2 . 5 . 6 . 7 . 8th are in particular form as detachable connections.

Generally, through the use of the sleeve 16 moving out of the pins used for torque transmission 20 be effectively avoided. The sleeve 16 and their sealing elements or O-rings 17 . 18 or sealing sleeve 26 are designed so that they under no circumstances as loose parts in the product space or interior 19 the pump 1 advised. This is partly due to the cylindrical shape or ring shape of the items 16 . 17 . 18 . 26 , but also by the advantageous interaction of different diameters and / or cross sections of the waves 9 . 10 . 11 and cover sleeve 16 and the O-rings 17 . 18 or sealing sleeve 26 reached.

• – Durch die axiale Verpressung von O-Ring 18 durch die Anschlassflächen der Rotorwelle 10 und der dazugehörigen Anschlussteile wird der O-Ring 18 bei der Montage durch Volumenverdrängung in radialer Richtung vorgespannt. Dieser Vorgang bewirkt bereits bei der Montage ein merkbares Verklemmen der Hülse 16.
• – Ist die definierte Endlage bzw. geschlossene Position durch den Anschlag 24 an den Endanschlägen erreicht, findet in dem Bereich des O-Rings 18, der hierbei teilweise offen zum Innenraum 19 ausgebildet ist, eine Entspannung statt. Durch diese Entspannung findet an dieser Stelle eine örtliche Vergrößerung im Außendurchmesser des O-Rings 18 statt, so dass der Überstand 23 gebildet wird.
• – Die Anlehnflächen des O-Rings 18 liegen hierbei tangential zu den Anschlussflächen des Andrehdurchmessers der Rotorwelle 10 bzw. Innendurchmesser der Hülse 16 an, wodurch eine entsprechend gute Reinigbarkeit erzielt werden kann.
• – Beim O-Ring 17 bzw. bei der Dichtmanschette 26 stellt sich bei Erreichen der Endlage bzw. der geschlossenen Position der Hülse 16 eine definierte radiale Verpressung ein, so dass auch hier eine Verklemmung zwischen O-Ring 17 bzw. Dichtmanschette 26 und Hülse 16 erreicht wird. Auch hier liegen die Anlehnflächen tangential an den Anschlussflächen des Anschlussteils an, wodurch auch hier eine entsprechend gute Reinigbarkeit erzielt werden kann.
• – Die Form der Hülse 16 ist durch vorteilhafte Formgebung so gestaltet, dass insgesamt gute Reinigungsergebnisse erzielt werden können. Vorteilhaft ist hierbei die im Wesentlichen über die Gesamtbreite der Hülse 16 gestaltete Phase, die trotz strömungsabgewandter Seite des O-Rings 18, eine gute Reinigung zulässt.
• – Durch die Abrundung möglichst aller Ecken findet eine entsprechend schonende Verpressung der O-Ring-Abdichtung 17, 18 bzw. Dichtmanschette 26 statt. Andererseits wird eine ausgezeichnete Umspülung der Ecken gewährleistet, was wiederum die Reinigungsfähigkeit der Verbindung 15 verbessert.

Due to the advantageous dimensioned and very well-defined compression of the O-rings 17 . 18 or sealing sleeve 26 in the axial and / or radial direction, a high security of the sleeve 16 achieved in the axial direction. The end position or the closed position of the sliding sleeve or covering sleeve 16 is by a hard stop or stop 24 Are defined. When mounting the sleeve 16 turns with reaching the stop 24 following situation

• - By the axial compression of O-ring 18 through the abutment surfaces of the rotor shaft 10 and the associated connecting parts will be the O-ring 18 preloaded during assembly by volume displacement in the radial direction. This process already causes a noticeable jamming of the sleeve during assembly 16 ,
• - Is the defined end position or closed position by the stop 24 reached at the end stops, takes place in the area of the O-ring 18 partially open to the interior 19 is trained to take a relaxation. By this relaxation takes place at this point a local enlargement in the outer diameter of the O-ring 18 instead, so the supernatant 23 is formed.
• - The leaning surfaces of the O-ring 18 in this case lie tangentially to the contact surfaces of the turning diameter of the rotor shaft 10 or inner diameter of the sleeve 16 on, whereby a correspondingly good cleanability can be achieved.
• - At the O-ring 17 or at the sealing sleeve 26 turns on reaching the end position or the closed position of the sleeve 16 a defined radial compression, so that here is a deadlock between the O-ring 17 or sealing sleeve 26 and sleeve 16 is reached. Again, the contact surfaces are tangent to the connection surfaces of the connection part, whereby also here a correspondingly good cleanability can be achieved.
• - The shape of the sleeve 16 is designed by advantageous shaping so that overall good cleaning results can be achieved. The advantage here is essentially over the entire width of the sleeve 16 designed phase, despite the downstream side of the O-ring 18 , allows a good cleaning.
• - The rounding of all corners as possible finds a correspondingly gentle compression of the O-ring seal 17 . 18 or sealing sleeve 26 instead of. On the other hand, an excellent rinsing of the corners is ensured, which in turn improves the cleaning ability of the compound 15 improved.

The Arrangement of the inlet side and the outlet side shown in the figures shows an example of a possible conveying direction the eccentric screw pump, wherein the conveying direction in principle also can be set opposite if the direction of rotation the rotor unit is reversed accordingly.

1

pump

2

engine

3

inlet

4

outlet

5

module

6

module

7

module

8th

module

9

wave

10

wave

11

wave

12

chamber

13

rotor housing

14

casing

15

connection

16

shell

17

O-ring

18

O-ring

19

inner space

20

pen

21

drilling

22

drilling

23

Got over

24

attack

25

guide section

26

sealing sleeve

Claims (14)

Eccentric screw pump with a pump housing in which a rotor unit is rotatably mounted, the at least two rotor elements ( 9 . 10 . 11 ) like a screw rotor ( 10 ) and a drive element ( 9 ), wherein the rotor elements ( 9 . 10 . 11 ) are rotatably connected to each other, characterized in that a connecting element ( 20 ) for the rotationally fixed connection (15) of the two rotor elements ( 9 . 10 . 11 ) and a cover element ( 16 ) are provided, wherein the connecting element ( 20 ) in the mounted position by the cover element ( 16 ) from the interior ( 19 ) of the pump housing is disconnected. Pump according to claim 1, characterized in that at least one seal ( 17 . 18 . 26 ) for sealing the connection element ( 20 ) in relation to the interior ( 19 ) of the pump housing is provided. Pump according to one of the preceding claims, characterized in that a sealing element ( 17 . 18 . 26 ) between the cover element ( 16 ) and at least one of the rotor elements ( 9 . 10 . 11 ) is arranged. Pump according to one of the preceding claims, characterized in that at least two seals ( 17 . 18 . 26 ) are provided for sealing the end portions of the cover on both sides. Pump according to one of the preceding claims, characterized in that at least one sealing element ( 17 . 18 . 26 ) as an O-ring ( 17 . 18 ) is formed with a Nutsitz. Pump according to one of the preceding claims, characterized in that the Nutsitz by the edge-side outer surfaces of the rotor elements to be joined together ( 9 . 10 . 11 ) at the anein is formed. Pump according to one of the preceding claims, characterized in that at least one sealing element ( 17 . 18 . 26 ) in the closed position of the cover ( 16 ) is pressed so that the Nutsitz is completely closed without marginal gap. Pump according to one of the preceding claims, characterized in that the sealing element ( 17 . 18 . 26 ) by pressing between rotor element ( 9 . 10 . 11 ) and cover element ( 16 ) the cover element ( 16 ) in its closed position. Pump according to one of the preceding claims, characterized in that at least one of the sealing elements ( 17 . 18 . 26 ) as a sealing collar ( 26 ) is trained. Pump according to one of the preceding claims, characterized in that the sealing collar ( 26 ) as a separating element ( 26 ) for separating at least a portion of the rotor element ( 9 . 10 . 11 ) from the interior ( 19 ) of the pump housing is formed. Pump according to one of the preceding claims, characterized in that the sealing collar ( 26 ) between two cover elements ( 16 ) is arranged. Pump according to one of the preceding claims, characterized in that at least one of the rotor elements ( 9 . 10 . 11 ) a guide section ( 25 ), whose outer diameter is smaller than the inner diameter of the cover ( 16 ), so that this is axially displaceable. Pump according to one of the preceding claims, characterized in that at least one of the rotor elements ( 9 . 10 . 11 ) an end stop ( 24 ) for the closed position of the cover ( 16 ) having. Pump according to one of the preceding claims, characterized in that the cover element ( 16 ) a cover sleeve ( 16 ).