WO2016086911A1 - Längenausgleichsvorrichtung - Google Patents
Längenausgleichsvorrichtung Download PDFInfo
- Publication number
- WO2016086911A1 WO2016086911A1 PCT/DE2015/000572 DE2015000572W WO2016086911A1 WO 2016086911 A1 WO2016086911 A1 WO 2016086911A1 DE 2015000572 W DE2015000572 W DE 2015000572W WO 2016086911 A1 WO2016086911 A1 WO 2016086911A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bellows body
- bellows
- stator
- length compensation
- compensation device
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
Definitions
- the invention relates to a length compensating device, in particular for an eccentric screw pump with a rotor and an axially adjustable stator, wherein the length compensating device is associated with the stator.
- the invention further relates to an eccentric screw pump with a length compensation device.
- the eccentric screw pump is one of the rotating positive displacement pumps whose pump section has a rotating part (rotor) and a fixed part (stator).
- the rotor is helically formed with a large pitch and flight depth and relatively small core diameter.
- the stator has one more thread and has twice the pitch length of the rotor. Between the rotor and the stator arise so pumping chambers, which move continuously from the inlet to the outlet side.
- the stator consists of an elastomeric body and a stator shell surrounding the elastomeric body. The elastomeric body effects a seal between the rotor and stator, which is generated by the fact that the inner contours of the stator are smaller than the outer contours of the rotor. Due to the bias creates an uninterrupted sealing line, which seals the successive delivery chambers and allows the construction of a delivery pressure.
- DE 1303705 discloses an eccentric screw pump whose internal diameter of the stator can be narrowed by compression, wherein the housing inner wall and the outer surface of the elastic stator are conical and the stator is axially adjustable in the housing. Compensation elements are provided between pump housing and stator. This is intended to ensure that after prolonged operation wear and tear can be compensated by adjusting the stator in the axial direction.
- the eccentric chord pump has a stator jacket and an elastic stator lining arranged therein, a stop being provided at both ends of the elastic stator lining for its axial limitation and means being provided at least at one end for changing the axial position of the stop.
- the setting of the stator jacket has a tensile or compressive force on the elastic stator lining, which changes the pressure on the rotor and thus the preload.
- the inner cross section of the lining is correctable.
- adjusting rings or shims are used, wherein the adjusting ring can also be arranged movably in an adjusting device to act positively on the stator lining during a pump operation.
- the adjusting ring is in contact with the fluid, so means are required to ensure a seal between the adjusting ring and the pump housing or stator shell can.
- a compensating device with which the change in length of the stator due to the axial adjustment can be compensated without parts of the compensation device come into contact with the fluid.
- the compensating device should preferably allow an axial guidance of the stator.
- known from the prior art solutions of the above type are but insufficiently suitable.
- the invention is therefore based on the object to provide a length compensation device for guiding a pumped medium, with which a change in length, in particular of the stator of an eccentric screw pump, is effectively and safely possible.
- the length compensating device comprises at least one axially flexible supporting body in which a bellows body assigned to the supporting body is arranged to guide a conveying medium.
- the invention is based on the consideration that a length compensation device or its parts are sensitive to dirt and therefore should not come into contact with the fluid. By using lubricants friction and wear could be kept low and a sealing effect could be increased. It should also be avoided as possible that operating materials such as oils and fats, for example, as a result seal wear and leaks, can get into the fluid.
- the length compensation device has a support body which does not come into contact with the conveyor medium.
- a bellows body is arranged, which is in contact with the conveying medium and through which the conveying medium can flow.
- the support body is designed such that it can perform the axial movement of the bellows body with. This allows the entire length compensation device advantageously stretching or upsetting.
- the bellows body can be in contact with the support body so that it can be supported directly on the support body.
- the bellows body can also be coupled to achieve the support function via suitable means with the support body.
- the support body is preferably pressure-tightly coupled to the bellows body, such that a fluid chamber between the support and bellows body is formed, which supports the bellows body in the radial direction.
- the bellows body is thus exposed to no form-changing pressure load and thus remains substantially dimensionally stable.
- a pressure sensor assigned to the fluid chamber is provided for measuring the pump internal pressure.
- the pressure sensor is thus advantageously not in contact with the fluid and the measuring device, for example, can not clog.
- the fluid in the fluid chamber thus serves as a pressure transmitter for pressure detection and can also be used as overpressure protection.
- the support body may be formed from one or more compensation elements, wherein the compensation elements are in turn pressure-tightly coupled together.
- the bellows body is preferably made of an elastically deformable plastic, which elastically deforms when setting the stator.
- the support body may for example be integrally formed from a metallic material in the form of a bellows as compensation element.
- the bellows points a sufficiently high radial stiffness to accommodate acting on the bellows body pressure forces can.
- the bellows body has a funnel-like shape, which tapers towards the pump. This ensures that the bellows body assumes a flow-optimized shape even in the compressed state. Due to the special shape a compact design of the length compensation device is also possible because the bellows body can invagination when upsetting, which is not possible for example in a simple bellows and therefore requires comparatively more space in the axial direction in the compressed state.
- the length compensation device is arranged product outlet side.
- the arrangement and design of the pump-side drive elements can be so advantageously disregarded in the configuration of the device according to the invention.
- the support bodies are designed as a cylinder-piston pairing, such that the cylinder is pressure-tightly coupled as a first outer compensation element with the piston as a second inner compensation element by preferably recesses for sealing means are introduced in the piston.
- Pistons and cylinders are preferably designed such that the support body also serves as a guide means.
- the bellows body to Sollfaltstellen can advantageously the shape of the bellows body are influenced in its compression.
- the Sollfaltstellen can be generated, for example, in that the bellows body has a certain basic shape and / or by increasing or decreasing the material thickness at designated locations or areas. It is also conceivable attachment or insertion of auxiliary elements, for example in the form of a ring, which fluid chamber side to the
- the areal regions of the bellows body may for this purpose have different material thicknesses and / or be arranged at an angle to one another.
- the support body for regulating fluid within the fluid chamber has at least one closable opening or a valve.
- fluid is introduced into the fluid chamber via a valve, wherein air displaced by fluid can escape at an opposite point of the support body.
- the amount of fluid in the fluid chamber can be regulated in order to additionally influence the shape and the compression behavior of the bellows body.
- a control device may be provided, which makes it possible, in dependence on measured parameters of the pump, to increase the pressure in the fluid chamber or to lower it.
- the bellows body is designed such that the length compensation device in addition we can ⁇ ken as a shut-off.
- the bellows body is formed of a highly elastic elastomer body.
- a controllable pressure source in the fluid ⁇ chamber increases so far until the bellows body deformed and the Passage in the length compensation device seals. This ensures that, for example, assembly work on the pump or the conveyor system are made possible without additional shut-off devices.
- the advantages achieved by the invention are in particular that the medium flowing through the bulkhead by means of Belb stresses, in particular by an elastomeric bellows body, does not come into contact with the support body, in particular not in contact with the sealing elements.
- a formed between the bellows body and the support body cavity can be filled with lubricating fluid, whereby seal and guide means are permanently lubricated protected against excessive wear.
- the use of a relatively thin-walled bellows body is made possible, characterized in that the bellows body is not exposed to any significant change in shape high pressure load, thereby further improving its folding behavior.
- a funnel-like shape of the bellows body a particularly short design is possible because of the bellows body can collapse in itself. It is also advantageous that only the bellows body, as a wear part or component with certain physical or chemical properties and requirements in terms of the pumped medium, can be easily replaced without replacing the entire length compensation device.
- FIG 1 shows schematically the stator of an eccentric screw
- FIG. 2 shows the length compensating device from FIG. 1 in the state of maximum deflection and the body of the bellows pushed on,
- FIG. 3 shows the length compensation device from FIG. 1 in the state of maximum deflection and undipped bellows body
- FIG. 4 shows a length compensation device in the state of maximum
- Figure 5 is a length compensation device with a wave-like bellows body
- Figuer 6 a length compensation device with a wave-like bellows body and a pressure sensor.
- FIG. 1 shows the stator 2 of an eccentric screw pump with a length compensation device 4 connected thereto on the end side.
- the stator 2 comprises an elastomer body 6, which is arranged inside a stator jacket 8, the stator 8 being coupled to a pump housing at its end, not shown here.
- a cylinder-piston pairing serves as a two-part support body 10,12 of the length compensation device 4, wherein the piston 10 has circumferentially extending recesses 14, in which sealing means not shown here are arranged.
- an elastomeric bellows body 16 is arranged, which is clamped pressure-tight stator between a stator 18 and the piston 10 and a pressure-side pump flange 20 and the cylinder 12.
- the piston 10 On its side facing the bellows body 16, the piston 10 is provided in each case with a bevel on the end side in order to keep a mechanical load on the bellows body 16 as small as possible.
- a fluid chamber 22 formed between the bellows body 16 and the support body 10, 12 is filled with a lubricating fluid (not shown). Via a lower valve opening 24 in the cylinder 12, the fluid can be filled, wherein over an opposite opening 26 in the cylinder 12 air can escape during a filling process. So that no fluid can escape from the opening 26 and the desired support effect for the bellows body 16 can be achieved, the opening 26 is again closed pressure-tight after the filling process.
- the bellows body 16 has seen in the axial direction different wall thicknesses, the wall thickness on the side of the pump flange 18 is lower than on the stator side. This results in a sufficiently high rigidity of the bellows body 16 in an area which should not or only slightly deform. An achieved change in shape upon activation of the length compensation device 4 thus occurs essentially only in a designated area.
- a length compensation device 4 in a state of maximum positive and maximum negative deflection is shown in Figures 2 and 3.
- the bellows body 16 shown in Figure 2 assumes the shape shown in the inverted state due to its basic shape and different material thickness.
- Fig. 3 shows the bellows body 16 in its basic form without elastic deformation within the length compensation device in the state of maximum positive deflection.
- a length compensating device 4 is shown analogously to FIG. 2 without illustrated recesses for sealing elements, which comprises an inverted bellows body 16, but because of its particular configuration has Sollfaltstellen, in particular closed Sollfaltlinien 28 which extend in the periphery of the bellows body 16.
- the bellows body 16 has for this purpose in the periphery a plurality of surface portions 30, which cause the desired shape when compressing the bellows body 16.
- the surface portions 30 are arranged at least in the non-deformed state of the bellows body 16 at an angle to each other, wherein the transitions form the desired fold lines 28 from one surface to the adjacent surface. Via fluid (shown dotted) in the fluid chamber 22, between the bellows body 16 and the support body 10,12, the bellows body 16 is supported.
- a bellows body 16 which is formed in a wave-like fashion in its basic form in a longitudinal section is shown in FIG. 5, which can be compressed and stretched due to its shape.
- the bellows body 16 is in places on the piston 10 and forms the fluid chamber 22 dividing chambers.
- longitudinal recesses (not shown), which form flow channels and connect the individual chambers together.
- FIG. 6 shows the length compensation device with a bellows body 16 which has a wave-like design as in FIG. 5, the fluid chamber 22 being coupled via the upper valve opening to a valve 34 and a pressure gauge 32 connected thereto.
- the valve 34 serves as a shut-off and damping valve.
- the fluid chamber 22 may be coupled via the upper valve opening to a controllable pressure source (not shown) to control or regulate the pressure in the fluid chamber 22 by means of a pressure sensor.
- the device is preferably aligned with adjustable stators of an eccentric screw pump.
- a bellows body which is stabilized in particular via a fluid chamber by means of a support body, advantageously causes, for example, designed as a support body guide means, which should be lubricated for safe operation, can not come into contact with the fluid.
- a funnel-like shape of the bellows body has a positive effect on the flow of the pumped medium and its folding behavior.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2017123351A RU2017123351A (ru) | 2014-12-04 | 2015-12-03 | Устройство для компенсации изменений длины |
AU2015357838A AU2015357838B2 (en) | 2014-12-04 | 2015-12-03 | Length compensation device |
KR1020177017951A KR20170091687A (ko) | 2014-12-04 | 2015-12-03 | 길이 보상 장치 |
EP15841038.1A EP3227555A1 (de) | 2014-12-04 | 2015-12-03 | Längenausgleichsvorrichtung |
CN201580066076.7A CN107002668B (zh) | 2014-12-04 | 2015-12-03 | 长度补偿装置 |
JP2017529770A JP2017536507A (ja) | 2014-12-04 | 2015-12-03 | 長さ補償装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014117932.3 | 2014-12-04 | ||
DE102014117932.3A DE102014117932B3 (de) | 2014-12-04 | 2014-12-04 | Längenausgleichsvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016086911A1 true WO2016086911A1 (de) | 2016-06-09 |
Family
ID=55486094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2015/000572 WO2016086911A1 (de) | 2014-12-04 | 2015-12-03 | Längenausgleichsvorrichtung |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP3227555A1 (de) |
JP (1) | JP2017536507A (de) |
KR (1) | KR20170091687A (de) |
CN (1) | CN107002668B (de) |
AU (1) | AU2015357838B2 (de) |
DE (1) | DE102014117932B3 (de) |
RU (1) | RU2017123351A (de) |
WO (1) | WO2016086911A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016121581B4 (de) * | 2016-11-10 | 2018-07-26 | Seepex Gmbh | Exzenterschneckenpumpe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3000477A1 (de) * | 1980-01-08 | 1981-07-09 | Lorenz 7312 Kirchheim Baron | Wellen-kreuzgelenk, insbesondere fuer eine exzenter-schneckenpumpe |
DD279043A1 (de) * | 1988-12-29 | 1990-05-23 | Hydrogeologie Nordhausen Halle | Stator fuer exzenterschneckenpumpen |
DE102005042559A1 (de) | 2005-09-08 | 2007-03-15 | Netzsch-Mohnopumpen Gmbh | Statorsystem |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260314B (de) * | 1959-10-23 | 1968-02-01 | Fmc Corp | Exzenterschneckenpumpe mit Saugkammer an der Antriebsseite |
DE1303705C2 (de) * | 1966-07-06 | 1973-10-11 | Axial foerdernde verdraengerpumpe mit rotierendem pumpelement | |
FR2660046B1 (fr) * | 1990-03-26 | 1992-07-17 | Agard Jean Paul | Compensateur de dilatation pour les canalisations. |
FR2948424B1 (fr) * | 2009-07-23 | 2017-07-21 | Pcm | Pompe a cavites progressives et dispositif de pompage associe |
DE102010037440B4 (de) * | 2010-09-09 | 2014-11-27 | Seepex Gmbh | Exzenterschneckenpumpe |
CN203783889U (zh) * | 2014-03-04 | 2014-08-20 | 唐山玉联机电有限公司 | 一种可调式液体介质输送螺杆泵 |
CN203939701U (zh) * | 2014-03-12 | 2014-11-12 | 重庆美视水电设备制造厂 | 一种可补偿内啮合回转式螺杆泵总成 |
CN104047846B (zh) * | 2014-06-09 | 2018-05-15 | 无锡市恒烽水煤浆有限公司 | 耐磨损高压单螺杆泵 |
-
2014
- 2014-12-04 DE DE102014117932.3A patent/DE102014117932B3/de active Active
-
2015
- 2015-12-03 AU AU2015357838A patent/AU2015357838B2/en not_active Ceased
- 2015-12-03 KR KR1020177017951A patent/KR20170091687A/ko not_active Application Discontinuation
- 2015-12-03 EP EP15841038.1A patent/EP3227555A1/de not_active Withdrawn
- 2015-12-03 RU RU2017123351A patent/RU2017123351A/ru not_active Application Discontinuation
- 2015-12-03 JP JP2017529770A patent/JP2017536507A/ja active Pending
- 2015-12-03 CN CN201580066076.7A patent/CN107002668B/zh not_active Expired - Fee Related
- 2015-12-03 WO PCT/DE2015/000572 patent/WO2016086911A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3000477A1 (de) * | 1980-01-08 | 1981-07-09 | Lorenz 7312 Kirchheim Baron | Wellen-kreuzgelenk, insbesondere fuer eine exzenter-schneckenpumpe |
DD279043A1 (de) * | 1988-12-29 | 1990-05-23 | Hydrogeologie Nordhausen Halle | Stator fuer exzenterschneckenpumpen |
DE102005042559A1 (de) | 2005-09-08 | 2007-03-15 | Netzsch-Mohnopumpen Gmbh | Statorsystem |
Non-Patent Citations (1)
Title |
---|
See also references of EP3227555A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP3227555A1 (de) | 2017-10-11 |
CN107002668B (zh) | 2019-02-15 |
KR20170091687A (ko) | 2017-08-09 |
CN107002668A (zh) | 2017-08-01 |
DE102014117932B3 (de) | 2016-03-31 |
AU2015357838A1 (en) | 2017-07-06 |
RU2017123351A3 (de) | 2019-01-09 |
AU2015357838B2 (en) | 2018-12-06 |
JP2017536507A (ja) | 2017-12-07 |
RU2017123351A (ru) | 2019-01-09 |
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