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EP3653880B1 - Pompe rotative avec garniture mécanique - Google Patents

Pompe rotative avec garniture mécanique Download PDF

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Publication number
EP3653880B1
EP3653880B1 EP19206938.3A EP19206938A EP3653880B1 EP 3653880 B1 EP3653880 B1 EP 3653880B1 EP 19206938 A EP19206938 A EP 19206938A EP 3653880 B1 EP3653880 B1 EP 3653880B1
Authority
EP
European Patent Office
Prior art keywords
shaft
wall
pump
seal
product
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.)
Active
Application number
EP19206938.3A
Other languages
German (de)
English (en)
Other versions
EP3653880A1 (fr
Inventor
Benjamin Steinig
René Linck
Torben Hahn
Jörn Ahrens
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.)
Fristam Pumpen Schaumburg GmbH
Original Assignee
Fristam Pumpen Schaumburg GmbH
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
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Application filed by Fristam Pumpen Schaumburg GmbH filed Critical Fristam Pumpen Schaumburg GmbH
Publication of EP3653880A1 publication Critical patent/EP3653880A1/fr
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Publication of EP3653880B1 publication Critical patent/EP3653880B1/fr
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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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/805—Fastening means, e.g. bolts

Definitions

  • the invention relates to a rotating pump with at least one driven conveying element, which is arranged in a product space through which the product to be conveyed flows and is driven by means of a shaft protruding from the outside into the product space, and wherein the shaft is sealed against a wall of the product space, the
  • the seal is designed as a mechanical seal to be mounted on the product side and comprises a form-fitting position securing device in order to prevent the mechanical seal from twisting and shifting of the mechanical seal in the direction of the product area.
  • a well-known measure for sealing the shaft against the wall is, for example, the use of shaft sealing rings.
  • shaft sealing rings are only reliable to a limited extent and are particularly out of the question if the type of product to be conveyed requires a particularly secure seal, e.g. when conveying toxic substances or in the hygienic area, e.g. in the food and cosmetics industry.
  • the seal generally has at least one rotating section connected to the shaft and a stationary section mounted in the wall.
  • this section usually has a flange or a receptacle which is fixed in the wall in a force-fitting and / or form-fitting manner, for example by screwing with several screws or by shrinking.
  • the shaft To assemble the flange, the shaft must be pulled completely out of the product space. With many pumps, this requires a complete separation of the product area and the pump drive. Since the rotating section of the mechanical seal can only be installed from the product side at the same time, the replacement or maintenance of the seal is very complex. In addition, when the product space with the installed stationary section of the seal and the pump drive are brought together, there is a risk that the seal will be damaged by uncontrolled contact with the shaft.
  • a rotating pump with at least one driven conveying element, which is arranged in a product space through which the product to be conveyed flows and is driven by means of a shaft protruding from the outside into the product space, and the shaft against a wall of the product space is sealed, the seal being designed as a mechanical seal to be mounted on the product side and comprising a form-fitting position lock to prevent the mechanical seal from twisting and shifting of the mechanical seal in the direction of the product space, which is further developed in that the position lock is perpendicular to an axial direction of the Includes shaft extending through the wall securing element.
  • the securing element runs through the wall perpendicular to the axial direction of the shaft, the securing element ends outside the product space in an area in which the securing element can easily be handled.
  • the mechanical seal can comprise a stationary sleeve inserted into the wall, in which a first sliding ring is received, and a rotating sleeve fastened on the shaft, in which a second sliding ring is received, the securing element can engage in a recess of the stationary sleeve.
  • the position of the mechanical seal can be secured in a particularly simple manner.
  • the securing element comprises a pin guided through a bore in the wall.
  • the bore has an enlarged diameter at an end remote from the seal and is provided with an internal thread. Furthermore, the pin is received with one end remote from the seal in a sealing screw which is screwed into the bore. As a result, on the one hand, the pin is fixed in the bore in a particularly simple manner, and on the other hand, the bore is sealed against the environment so that no air can be drawn through the bore into the product space when a negative pressure occurs in the product space.
  • the shaft can extend outside of the product space into a bearing housing, a leakage space being formed between the wall of the product space and the bearing housing, and the leakage space being covered to the outside by a sheet-like protection guard which can be attached to the wall by means of the sealing screw.
  • a pump according to the invention can be a twin screw screw pump.
  • a pump 1 is shown, which is a single-flow screw pump.
  • the pump 1 has a gear section 2 and a pump section 3.
  • the gear section consists of a bearing housing 5 with an inspection opening which is closed by a cover 6.
  • the pump section comprises a product inlet 7 and a product outlet 8.
  • a leakage space is arranged between the gear section 2 and the pump section 3 and is secured by an anti-intrusion guard 9.
  • FIG Figure 2 The internal structure of the pump 1 is shown in FIG Figure 2 shown.
  • Two displacement bodies 10, 11 in the form of feed screws are arranged in a product space of the pump section 3.
  • the product to be conveyed is removed from the in Figure 2 not visible product inlet to the product outlet 8 promoted.
  • the displacers 10, 11 are fastened at the ends on shafts 12, 13 and secured there by means of nuts 14, 15. In order to prevent the displacement bodies 10, 11 from rotating on the shafts 12, 13, they can have suitable form-locking elements.
  • the displacement bodies 10, 11 engage with one another with very little play in order to enable efficient product conveyance.
  • the shafts 12, 13 must be mounted precisely and stiffly.
  • the shafts 12, 13 are supported in the gear section 2.
  • the bearing housing 5 of the gear section 2 consists of a main body 16 and a closing body 17, which are releasably fastened to one another, for example by means of a screw connection.
  • the closing body 17 has a planar first stop surface 18 which rests against a corresponding stop surface of the main body.
  • a surface normal of the stop surface 18 runs approximately parallel to the axial direction of the shafts 12, 13.
  • the closing body 17 has a circumferential second stop surface 19 which rests on the inside against a corresponding stop surface of the main body 16.
  • a surface normal of the stop surface 19 runs approximately perpendicular to the axial direction of the shafts 12, 13 at each point of the stop surface 19. Starting from the second stop surface 19, the closing body 17 tapers in the direction of the pump section 3.
  • the main body 16 has receiving bores 22,23 into which radially acting bearings 24,25 are inserted, needle bearings in the example shown.
  • the inner rings of the needle bearings are shrunk onto the respective shafts, while the outer rings and the needle cages of the needle bearings are axially fixed in the receiving bores 22, 23 between a stop shoulder and a clamping ring.
  • the closing body 17 has receiving bores 30,31 into which radially and axially acting bearings 32,33 are inserted.
  • the radially and axially acting bearings 32, 33 each include three angular contact ball bearings. Other numbers of ball bearings are possible, each of the bearings 32, 33 comprising at least two oppositely positioned angular contact ball bearings for good support.
  • the inner rings of the bearings 32,33 are fixed on the shafts 12,13 by means of locknuts 34,35.
  • the outer rings of the bearings 32, 33 are fixed in the receiving bores 30, 31 between a stop shoulder and fixing plates 36, 37 screwed to the closing body 17 within the bearing housing 5.
  • the shaft 10 serves as a drive shaft and therefore has a drive journal 38 which protrudes from the bearing housing 5.
  • the receiving bore 30 is designed as a through hole, while the receiving bore 33 is designed as a blind hole.
  • a synchromesh gear 40 is arranged, by means of which the shafts 12, 13 are rotationally coupled.
  • a first pinion 41 of the synchronous gear 40 is fastened in a rotationally fixed manner on the shaft 10 by means of a feather key connection.
  • the pinion 41 is axially fixed between a stop shoulder of the shaft 12 and the inner rings of the bearing 32.
  • a second pinion 42 must be attached to the shaft 13 so that it can rotate with respect to one another for the rotational alignment of the displacement bodies 10, 11.
  • the pinion 42 comprises a ring gear 43 which is seated on a sleeve 44.
  • the sleeve 44 is fastened in a rotationally fixed manner on the shaft 13 by means of a feather key connection and, like the pinion 41, is axially fixed between a stop shoulder of the shaft 13 and the inner rings of the bearing 33.
  • the sleeve 44 has a circumferential projection 45 on which the ring gear 43 rests.
  • a ring 46 rests on the projection 45 from the other side.
  • the ring gear 43 and the ring 46 are screwed to one another and are thus fixed to the projection 45 in a force-locking manner.
  • an oil sump is provided in the bearing housing 5, into which the pinions 41, 42 of the synchronous gear 40 are immersed.
  • the rotating pinions 41,42 generate an oil mist which cools and lubricates the bearings 24,25,32,33.
  • the inner rings of the bearings 24, 25 are first shrunk onto the shafts 12, 13. Then, one after the other, the pinions 41, 42, the fixing disks 36, 37 and then the bearings 32, 33 are placed on the shafts 12, 13 and fixed by means of the locknuts 34, 35.
  • the shafts 12, 13 with the bearings 32, 33 are inserted into the receiving bores 30, 31 and fixed to the closing body 17 by screwing the fixing plates 36, 37.
  • the closing body 17 is tapered in such a way that it can be inserted into the main body 16 without any problems. Only when the stop surface 19 enters the main body 16 is the closing body 17 guided closely.
  • the stop surface 19 extends in the axial direction of the shafts 12, 13 over a length that is significantly less than the length of the bearings 32, 33, namely less than 35%, preferably less than 30%, particularly preferably less than 25% of the length of the bearings 32.33. In the example shown, the extent of the stop surface 19 in the axial direction of the shafts 12, 13 is approximately 17% of the length of the bearings 32, 33.
  • the introduction of the closing body 17 into the main body 16 is further facilitated by the fact that the extension of the stop surface 19 in the axial direction of the shafts 12, 13 is less than the length of the radially acting bearings 24, 25. As a result, the shafts 12, 13 are already supported by the bearings 24, 25 before the stop surface 19 enters the main body 16. Thus, the closing body 17 cannot tilt during assembly.
  • the mechanical seal 52 comprises a stationary sleeve 53 which is inserted into a receiving bore 45 in the wall 50.
  • a first slide ring 55 is received in the stationary sleeve 53 in a rotationally fixed manner.
  • the mechanical seal 52 comprises a rotating sleeve 56 which is fixed on the shaft 13 between a stop shoulder and the displacement body 11.
  • a second slide ring 57 is received in a rotationally fixed manner in the rotating sleeve 56.
  • the sliding rings 55, 57 rest against one another with planar sliding surfaces and are axially pretensioned against one another by spring elements 58.
  • the stationary sleeve 53 For the mechanical seal 52 to function reliably, the stationary sleeve 53 must be secured against twisting in the receiving bore 54. At the same time, it must be prevented that the stationary sleeve 53 is pulled out of the receiving bore 54 with compression of the spring elements 58 in the direction of the product space when a negative pressure occurs in the product space.
  • the stationary sleeve 53 has a recess 60 on its outer circumference, into which a securing element 61 extending through the wall 50 engages.
  • the stationary sleeve 53 can have a flat surface (not shown) in the region of the recess 60 in order to simplify the correct alignment of the sleeve 53 during assembly.
  • the securing element 61 comprises a pin 62 which runs through a bore 63 in the wall 50. At an end remote from the mechanical seal 52, the bore 63 is widened and provided with an internal thread 64. A sealing screw 65, in the shaft of which the pin 62 is received, is screwed into the internal thread 64.
  • the length of the pin 62 is dimensioned such that, when the sealing screw 65 is screwed in completely, it engages positively in the recess 60 of the stationary sleeve 53 without exerting a radial force on the stationary sleeve 53. As a result of a radial force, there would be the risk that the sleeve 53 would be deformed and thus the sealing effect of the mechanical seal 52 would be impaired.
  • the sealing screw 65 seals the bore 63 from the surroundings of the pump 1, so that no air can be sucked in through the bore 63 in the event of a negative pressure in the product space.
  • the sealing screw 65 also serves to fasten the access protection 9 to the wall 50.
  • the securing element 61 is released so that the stationary sleeve 53 with the first sliding ring 55 can also be pulled out of the receiving bore 54 in the direction of the product space.
  • the pump 1 can be equipped with double-acting mechanical seals.
  • double-acting mechanical seals can be flushed from the inside during operation; flushing channels (not shown) are provided in the wall 50 for this purpose.
  • flushing channels are provided in the wall 50 for this purpose.
  • the correct rotational alignment of the mechanical seals in the receiving bores is particularly important so that the flushing openings of the mechanical seals lie against the ends of the flushing channels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Mechanical Sealing (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (4)

  1. Pompe rotative avec au moins un élément de transport (10, 11) entraîné, qui est disposé dans une chambre à produit traversée par le produit à transporter et qui est entraîné au moyen d'un arbre (12, 13) pénètre de l'extérieur dans la chambre à produit, l'arbre (12, 13) étant rendu étanche par rapport à une paroi (50) de la chambre à produit et l'étanchéité étant réalisée sous la forme d'une garniture mécanique (51, 52) à monter du côté du produit et comprenant un blocage en position par complémentarité de forme afin d'empêcher une rotation de la garniture mécanique (51, 52) et un déplacement de la garniture mécanique (51, 52) en direction de la chambre à produit, caractérisé en ce que le blocage en position comprend un élément de fixation (61) s'étendant à travers la paroi (50) perpendiculairement à une direction axiale de l'arbre (12, 13),
    dans lequel l'élément de fixation (61) comprend une goupille (62) guidée à travers un alésage (63) de la paroi (50),
    l'alésage (63) a un diamètre élargi à une extrémité éloignée de l'étanchéité et est pourvu d'un filetage interne (64), et
    la goupille (62) est reçue avec une extrémité éloignée de l'étanchéité dans une vis d'étanchéité (65) qui est vissée dans l'alésage (63).
  2. Pompe selon la revendication 1, caractérisée en ce que la garniture mécanique (52) a
    - une douille stationnaire (53) insérée dans la paroi (50), dans laquelle est reçue une première bague de glissement (55), et
    - une douille rotative (56) fixée sur l'arbre (13), dans laquelle est reçue une deuxième bague de glissement (57),
    dans laquelle l'élément de fixation (61) s'engage dans un creux (60) de la douille stationnaire (53).
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que l'arbre (12, 13) s'étend à l'extérieur de la chambre du produit dans un boîtier de palier (5), un espace de fuite étant formé entre la paroi (50) de la chambre du produit et le boîtier de palier (5), et l'espace de fuite étant recouvert vers l'extérieur par une protection d'engagement en forme de tôle (9) qui est fixée à la paroi (50) au moyen de la vis d'étanchéité (65).
  4. Pompe selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la pompe est une pompe à double vis (1).
EP19206938.3A 2018-11-19 2019-11-04 Pompe rotative avec garniture mécanique Active EP3653880B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018129054.3A DE102018129054B4 (de) 2018-11-19 2018-11-19 Rotierende Pumpe

Publications (2)

Publication Number Publication Date
EP3653880A1 EP3653880A1 (fr) 2020-05-20
EP3653880B1 true EP3653880B1 (fr) 2021-08-25

Family

ID=68426321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19206938.3A Active EP3653880B1 (fr) 2018-11-19 2019-11-04 Pompe rotative avec garniture mécanique

Country Status (3)

Country Link
EP (1) EP3653880B1 (fr)
DE (1) DE102018129054B4 (fr)
DK (1) DK3653880T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115788864B (zh) * 2022-12-06 2023-06-23 河北恒盛泵业股份有限公司 一种防泄漏双螺杆泵
DE102024104231A1 (de) 2024-02-15 2025-08-21 FRISTAM Pumpen Schaumburg GmbH Verdrängerpumpe mit Gleitringdichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE246772T1 (de) * 1997-06-12 2003-08-15 Axima Refrigeration Gmbh Schmier- und sperrsystem für verdichter
WO2013105996A1 (fr) * 2011-02-17 2013-07-18 Standex International Corporation Joint mécanique pour pompe à fluide
ES2662795T3 (es) * 2012-02-17 2018-04-09 Netzsch Pumpen & Systeme Gmbh Bomba de émbolo giratorio
DE102015011808B4 (de) * 2015-09-09 2017-05-11 Netzsch Pumpen & Systeme Gmbh Antriebsstrangabschnitt, insbesondere für eine Exzenterschneckenpumpe
DE102016100959A1 (de) 2016-01-20 2017-07-20 FRISTAM Pumpen Schaumburg GmbH Rotierende Pumpe und Sicherungsblech
JP6621693B2 (ja) * 2016-03-23 2019-12-18 伏虎金属工業株式会社 メカニカルシールおよび２軸スクリューポンプ

Also Published As

Publication number Publication date
EP3653880A1 (fr) 2020-05-20
DE102018129054B4 (de) 2023-08-31
DK3653880T3 (da) 2021-11-01
DE102018129054A1 (de) 2020-05-20

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