EP0086781A1 - A screw pump - Google Patents

A screw pump

Info

Publication number
EP0086781A1
EP0086781A1 EP82901034A EP82901034A EP0086781A1 EP 0086781 A1 EP0086781 A1 EP 0086781A1 EP 82901034 A EP82901034 A EP 82901034A EP 82901034 A EP82901034 A EP 82901034A EP 0086781 A1 EP0086781 A1 EP 0086781A1
Authority
EP
European Patent Office
Prior art keywords
screw
sealing disc
teeth
pump
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP82901034A
Other languages
German (de)
French (fr)
Inventor
Nils BJÖRNBERG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUSTAV TERLING AB
Original Assignee
GUSTAV TERLING AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUSTAV TERLING AB filed Critical GUSTAV TERLING AB
Publication of EP0086781A1 publication Critical patent/EP0086781A1/en
Ceased legal-status Critical Current

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
    • F04C3/00—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type
    • F04C3/02—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged at an angle of 90 degrees
    • F04C3/04—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Definitions

  • the present invention relates to a screw pump comprising a driving screw and a toothed, rotatable sealing disc meshing therewith, the teeth of the disc meshing with recesses formed between the threads of the screw and seal against these, the teeth of the sealing disc having substantially parallel side edges and triangular gaps between the teeth.
  • Screw pumps of the kind mentioned above shall be able to handle pump mediums, for example oils, having a low viscosity as well as material having an extremely high viscosity, such as thick tarlike substances from the discharge of oil in the sea which have been in contact with water for a long time. Furthermore, the pump shall also be able to handle solid impurities which are present for example in connection with oil clearence, such as seaweed, plastics, dead birds or the like without being blocked.
  • the sealing disc is to keep the screw fairly clean from adhering substances. Due to the fact that the threads of the pump screw are chamferred or helical the gaps between the teeth of the sealing disc must have a corresponding chamferred form, which means that the sealing disc must be manufactured in two parts to be able to be mounted in the pump housing in engagement with the driving screw.
  • the pump is constructed usually with varying pitch in the direction towards the outlet the gaps between the teeth must be made relatively large, which brings about that the scraping effect decreases and so the pump effect.
  • the purpose of the present invention is to provide a screw pump, which has a high pump effect, which exerts the sealing disc to a substantially less wearing, which effectively can keep the pump screw clean from adhering substances, which can be manufactured by casting and thus obtains a low weight simultaneously as it is simple from a constructional point of view and thus can be easily disassembled for cleaning, service and repair.
  • the flanges, which form the thread of the screw have a substantially constant or, in the direction towards the top of the flange, tapering thickness with the exception of the threaded part of the screw situated in front of the central part of the sealing disc, which threaded part is partially formed as a bead or a ridge, and that the bead or the ridge has a measure in the rotational direction of the screw which substantially corresponds to the shifting distance of the screw in moving the sealing disc from a position at which one tooth seals to a position at which a second, next following tooth seals.
  • Fig. 1 is a view from above of a screw pump according to the invention, the pump housing and the screw being shown partially in section.
  • Fig. 2 shows the screw and the sealing disc according to fig. 1 in another position.
  • Fig. 3 is a side view of the screw according to fig. 1 and 2.
  • the screw pump according to the invention consists of a pump housing 11, in which a driving screw 12 in the form a modified Archimedes' screw is centrally provided.
  • the inlet of the pump has the reference numeral 13 and its outlet the reference numeral 14.
  • the thread 21 of the screw 12 meshes with a toothed, rotatable sealing disc 15, for example made of glass fiber reinforced epoxy resin.
  • the sealing disc is rotatable around a shaft 16 and is encased in an extension 17 of the housing projecting from the pump housing.
  • the screw 12 is driven by a motor which is not further shown and which for example can comprise an hydraulic motor connected to the shaft end 24 of the screw turned away from the outlet.
  • the part of the thread 21 of the screw 12 which is situated in front of the central part of the sealing disc 15, is formed with a part 18 in the form of a bead or a ridge, which has a dimension along the thread 21, which corresponds to the displacement movement of the tooth 20 in engagement with the screw, when it changes its position shown in fig. 1 beside the central part of the disc 15, into the position shown in fig. 2 in front of said central part of the part of the screw which is situated in front of said central part.
  • the sealing disc 15 is formed with ridge like gaps 15. provided between the teeth 20 of the sealing disc which are formed with substantially parallel side edges 22. Each tooth 20 is along its side edges formed with bevels 25 one at each side of the sealing disc.
  • the screw 12 can be cast as a hollow shaft, the walls and flanges of which having substantially equal thicknesses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

Pompe helicoidale comprenant une vis d'entrainement (12) et un disque de scellement rotatif dente (15) s'engrenant dans la vis, les dents (20) du disque s'engrenant dans des recoins formes entre les filets (22) de la vis et formant une etancheite contre ceux-ci, les dents (20) du disque de scellement (15) possedant des bords lateraux (22) sensiblement paralleles et des espacements triangulaires (19) entre les dents. Le but de la presente invention est d'obtenir une pompe helicoidale possedant un effet de pompage eleve, qui provoque une usure sensiblement plus reduite du disque de scellement (15), qui peut debarrasser efficacement la vis de la pompe des substances y adherant, qui peut etre fabriquee par moulage de maniere a presenter un faible poids en meme temps qu'une forme simple d'un point de vue constructif et qui peut etre facilement demontee pour le nettoyage, l'entretien et les reparations. Ces conditions peuvent etre remplies en utilisant des brides, qui forment le filet (21) de la vis et qui presentent une epaisseur sensiblement constante ou, en direction du sommet de la bride, sensiblement conique a l'exception de la partie filetee de la vis (12) situee devant la partie centrale du disque de scellement (15), cette partie filetee ayant partiellement la forme d'un bourrelet ou d'une crete, et le bourrelet ou la crete (18) possedant une mesure dans la direction de rotation de la vis qui correspond sensiblement a la distance de decalage de la vis (12) dans le deplacement du disque de scellement (15) depuis une position dans laquelle une dent cree une etancheite jusqu'a une position dans laquelle l'etancheite est assuree par la dent suivante.Helical pump comprising a drive screw (12) and a toothed rotating sealing disc (15) meshing in the screw, the teeth (20) of the disc meshing in recesses formed between the threads (22) of the screws and forming a seal thereagainst, the teeth (20) of the sealing disc (15) having substantially parallel lateral edges (22) and triangular spacings (19) between the teeth. The object of the present invention is to obtain a helical pump having a high pumping effect, which causes significantly less wear of the sealing disc (15), which can effectively free the screw of the pump from substances adhering thereto, which can be manufactured by molding so as to present a low weight at the same time as a simple form from a constructive point of view and which can be easily disassembled for cleaning, maintenance and repairs. These conditions can be met by using flanges, which form the thread (21) of the screw and which have a substantially constant thickness or, towards the top of the flange, substantially conical with the exception of the threaded part of the screw (12) located in front of the central part of the sealing disc (15), this threaded part partially having the shape of a bead or a ridge, and the bead or the ridge (18) having a measurement in the direction of rotation of the screw which substantially corresponds to the offset distance of the screw (12) in the displacement of the sealing disc (15) from a position in which a tooth creates a seal to a position in which the seal is ensured by the next tooth.

Description

A screw pump
The present invention relates to a screw pump comprising a driving screw and a toothed, rotatable sealing disc meshing therewith, the teeth of the disc meshing with recesses formed between the threads of the screw and seal against these, the teeth of the sealing disc having substantially parallel side edges and triangular gaps between the teeth.
Background of the invention
Screw pumps of the kind mentioned above shall be able to handle pump mediums, for example oils, having a low viscosity as well as material having an extremely high viscosity, such as thick tarlike substances from the discharge of oil in the sea which have been in contact with water for a long time. Furthermore, the pump shall also be able to handle solid impurities which are present for example in connection with oil clearence, such as seaweed, plastics, dead birds or the like without being blocked.
Especially when the pump medium comprises tarlike substances having a high viscosity mixed with water the tendency is great that the substance, i.e. clods of heavy oil or the like, adheres to the threads of the screw without being expelled towards the outlet of the pump. In such cases the purpose of the sealing disc is to keep the screw fairly clean from adhering substances. Due to the fact that the threads of the pump screw are chamferred or helical the gaps between the teeth of the sealing disc must have a corresponding chamferred form, which means that the sealing disc must be manufactured in two parts to be able to be mounted in the pump housing in engagement with the driving screw. This also results in the fact that the disassembly of the sealing disc is relatively complicated, which is a great disadvantage when the pump must be quickly disassembled if for example a breakdown has occured or a too large object has entered the pump. In other screw pumps of this kind previously known (the German Patent Specification 434.327 or the French Patent Specification 1.386.020) the screw is constructed in such a way that the teeth of the sealing disc always have four side edges in active cooperation with the screw, which results in a relatively fast wearing down and thus frequent replacements of the sealing disc. Further, this construction results in the fact that the screw will get a very varying thickness of material, which makes the manufacture thereof substantially difficult. Since the disc cannot be cast it must be prepared from a solid material, which requires a heavy machining such as milling and grinding to obtain the necessary fit and thus a moderately good sealing.
By the fact that the pump is constructed usually with varying pitch in the direction towards the outlet the gaps between the teeth must be made relatively large, which brings about that the scraping effect decreases and so the pump effect.
Purposes of the invention and the most important features thereof
The purpose of the present invention is to provide a screw pump, which has a high pump effect, which exerts the sealing disc to a substantially less wearing, which effectively can keep the pump screw clean from adhering substances, which can be manufactured by casting and thus obtains a low weight simultaneously as it is simple from a constructional point of view and thus can be easily disassembled for cleaning, service and repair. These tasks have been solved by the features that the flanges, which form the thread of the screw have a substantially constant or, in the direction towards the top of the flange, tapering thickness with the exception of the threaded part of the screw situated in front of the central part of the sealing disc, which threaded part is partially formed as a bead or a ridge, and that the bead or the ridge has a measure in the rotational direction of the screw which substantially corresponds to the shifting distance of the screw in moving the sealing disc from a position at which one tooth seals to a position at which a second, next following tooth seals.
Discription of the drawings
Fig. 1 is a view from above of a screw pump according to the invention, the pump housing and the screw being shown partially in section.
Fig. 2 shows the screw and the sealing disc according to fig. 1 in another position.
Fig. 3 is a side view of the screw according to fig. 1 and 2.
Discription of embodiments The screw pump according to the invention consists of a pump housing 11, in which a driving screw 12 in the form a modified Archimedes' screw is centrally provided. The inlet of the pump has the reference numeral 13 and its outlet the reference numeral 14. The thread 21 of the screw 12 meshes with a toothed, rotatable sealing disc 15, for example made of glass fiber reinforced epoxy resin. The sealing disc is rotatable around a shaft 16 and is encased in an extension 17 of the housing projecting from the pump housing. The screw 12 is driven by a motor which is not further shown and which for example can comprise an hydraulic motor connected to the shaft end 24 of the screw turned away from the outlet.
The part of the thread 21 of the screw 12 which is situated in front of the central part of the sealing disc 15, is formed with a part 18 in the form of a bead or a ridge, which has a dimension along the thread 21, which corresponds to the displacement movement of the tooth 20 in engagement with the screw, when it changes its position shown in fig. 1 beside the central part of the disc 15, into the position shown in fig. 2 in front of said central part of the part of the screw which is situated in front of said central part. Correspondingly the sealing disc 15 is formed with ridge like gaps 15. provided between the teeth 20 of the sealing disc which are formed with substantially parallel side edges 22. Each tooth 20 is along its side edges formed with bevels 25 one at each side of the sealing disc.
By the special design of the screw and the sealing disc an effective, continuous sealing is obtained in the screw-like transport channel 23 of the pump screw and thus a good pump effect and a good scraping effect simultaneously as the sealing disc is easy to disassemble.
The screw 12 can be cast as a hollow shaft, the walls and flanges of which having substantially equal thicknesses.

Claims

1. A screw pump comprising a driving screw (12) and a toothed, rotatable sealing disc (15) meshing therewith, the teeth (20) of the disc meshing with recesses formed between the threads (22) of the screw and seal against these, the teeth (20) of the sealing disc (15) having substantially parallel side edges (22) and triangular gaps (19) between the teeth, c h a r a c t e r i z e d i n that the flanges, which form the thread (21) of the screw have a substantially constant or, in the direction towards the top of the flange, tapering thickness with the exception of the threaded part of the screw (12) situated in front of the central part of the sealing disc (15), which threaded part is partially formed as a bead or a ridge, and. that the bead or the ridge (18) has a measure in the rotational direction of the screw which substantially corresponds to the shifting distance of the screw (12) in moving the sealing disc (15) from a position at which one tooth seals to a position at which a second, next following tooth seals.
2. A screw pump according to claim 1, c h a r a c t e r i z e d i n that the screw (12) is formed as a hollow shaft, the walls and flanges of which having substantially equal thicknesses.
EP82901034A 1981-03-24 1982-03-22 A screw pump Ceased EP0086781A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8101863 1981-03-24
SE8101863A SE426975B (en) 1981-03-24 1981-03-24 SCREW PUMP

Publications (1)

Publication Number Publication Date
EP0086781A1 true EP0086781A1 (en) 1983-08-31

Family

ID=20343415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901034A Ceased EP0086781A1 (en) 1981-03-24 1982-03-22 A screw pump

Country Status (3)

Country Link
EP (1) EP0086781A1 (en)
SE (1) SE426975B (en)
WO (1) WO1982003428A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464531B (en) * 1990-03-29 1991-05-06 Anders Johansson SCREW PUMP
SE519580C2 (en) * 1998-07-13 2003-03-18 Anders Johansson Screw Pump
SE517590C2 (en) * 1998-12-09 2002-06-25 Claes Joakim Joensson Rotary machine for compression or expansion of a gaseous working medium
FI20060807L (en) * 2006-09-11 2008-03-12 Lars Ingram Lundin Oil transfer pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE434327C (en) * 1925-03-31 1926-09-23 Rudolf Haas Dr Ing Globoid screw machine, especially as a pump for conveying pulp and. like
FR1386020A (en) * 1964-03-17 1965-01-15 Bellmer K G Geb Pump for viscous materials
GB1288603A (en) * 1969-12-17 1972-09-13
SE358205B (en) * 1972-03-17 1973-07-23 T Hoving
US4179250A (en) * 1977-11-04 1979-12-18 Chicago Pneumatic Tool Company Thread construction for rotary worm compression-expansion machines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203428A1 *

Also Published As

Publication number Publication date
SE8101863L (en) 1982-09-25
WO1982003428A1 (en) 1982-10-14
SE426975B (en) 1983-02-21

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830421

AK Designated contracting states

Designated state(s): DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19850406

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BJOERNBERG, NILS