GB2202005A - Pump - Google Patents

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Publication number
GB2202005A
GB2202005A GB08705895A GB8705895A GB2202005A GB 2202005 A GB2202005 A GB 2202005A GB 08705895 A GB08705895 A GB 08705895A GB 8705895 A GB8705895 A GB 8705895A GB 2202005 A GB2202005 A GB 2202005A
Authority
GB
United Kingdom
Prior art keywords
seal
ring
pump
shaft
housing
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.)
Granted
Application number
GB08705895A
Other versions
GB8705895D0 (en
GB2202005B (en
Inventor
Thomas Fielder Fuggle
John Barry Westwood
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.)
SSP PUMPS
SSP PUMPS Ltd
Original Assignee
SSP PUMPS
SSP PUMPS Ltd
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 SSP PUMPS, SSP PUMPS Ltd filed Critical SSP PUMPS
Priority to GB8705895A priority Critical patent/GB2202005B/en
Publication of GB8705895D0 publication Critical patent/GB8705895D0/en
Publication of GB2202005A publication Critical patent/GB2202005A/en
Application granted granted Critical
Publication of GB2202005B publication Critical patent/GB2202005B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034Sealing 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
    • F04C15/0038Shaft sealings specially adapted for rotary-piston machines or pumps
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23GCOCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G7/00Other apparatus or process specially adapted for the chocolate or confectionery industry
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/002Sealings comprising at least two sealings in succession
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/40Sealings between relatively-moving surfaces by means of fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

A rotary lobe pump for pumping chocolate has a rotor housed in a rotor housing 2 and attached to a shaft 14 passing through said rotor housing 2, the shaft being sealed by means of a composite seal which comprises a labyrinth seal ring 6, a lip seal ring 7 and a mechanical seal 10, the annular chamber formed between the lip seal and mechanical seal being filled with an edible grease and the mechanical seal being operative to prevent leakage of said grease from said chamber. <IMAGE>

Description

"PUMP" This invention relates to a pump, and more particularly, a pump for pumping chocolate or similar foodstuffs.
Previous chocolate pumps have been unsatisfactory in that mechanical shaft seals have failed after a very short time. Cocoa butter separates out of the chocolate and shows as a yellow fat on the atmosphere side of the seal.
This is followed by precipitation of residual "burnt" sugar in the form of carbon deposits which causes rapid failure of the seal faces and leakage of pumped chocolate.
Alternatively, pumps have been manufactured having packed-gland type seals. However, no suitable packing material has been found and the packing material has invariably leaked causing degradation of leaking chocolate and rapid seal failure. The abrasive effect of the carbon and sugar deposits in the chocolate is emphasized by the fact that the pump is kept at a sufficiently elevated temperature to keep the chocolate fluid and pumpable.
Whereas prior to the present invention rotary pumps pumping chocolate at pressure have had their seals fail regularly after 2 to 3 days use, pumps embodying the present invention have been found to operate leak free for many months when under test.
According to the present invention, there is provided a pump having a ureter housed in a rt6f hôlleing and attached to a drive shaft passing through said rotor housing, the shaft being sealed to the housing by means of first and second seal means having an annular chamber formed therebetween such annular chamber being filled with an edible grease, the second seal means being operative to prevent leakage of said grease from said chamber to the exterior of the pump.
In order that the invention may be more readily understood, the following is given merely by way of example with reference to the accompanying drawing, in which the sole figure shows an axial section of the pump shaft seal.
The preferred chocolate pump is a rotary lobe pump although other types of pump may be used. The rotor 15 is fitted on a shaft 14 passing out through rotor housing 2. An optional sleeve 5 on the shaft is sealed by an 0-ring 13 and extends through a shaft seal to prevent leakage of the pumped chocolate. Instead of using the sleeve 5 as illustrated the sleeve may be omitted with the sealing means to be described engaging directly with the shaft instead of with the sleeve on the shaft. The seal is a composite seal housed in a housing 1 which is attached to the pump rotor housing 2 by means of studs 3 and nuts 4.
Chocolate which may leak along the shaft sleeve 5 from inside the rotor housing 2 first passes a labyrinth header ring 6 before encountering a resilient lip seal 7. The lip seal 7 is held by a retaining ring 8 and is kept in sealing engagement with the sleeve 5 by a garter spring 9. At the atmosphere side of the composite seal there is a mechanical seal 10 having a rotary portion sealed to the sleeve 5 by a rotary 0-ring 11 and a stationary portion of the seal sealed to the housing 1 by a stationary 0-ring 12. The rotary portion comprises a ring 16 having a sealing sliding engagement with the stationary portion and also includes a resilient rotary element 18 which is under compression to urge the ring 16 into sealing engagement with the stationary portion of the seal.The element 18 and ring 16 both have apertures engaged by grub screws 17 dimpled to the sleeve 5 to ensure the rotary portions of the seal will rotate with the shaft. The element 18 has a radially extending flange held in sliding engagement with an annular projection from the lip seal retainer 8. An annular chamber is formed between the lip seal 7 and the mechanical seal 10 and is packed with an edible grease. A suitable grease is sold under the name MOBIL GREASE FM2. The annular chamber is refillable with the grease via grease nipples 13 or other grease devices suitably placed around the housing 1. The grease will not leak past the mechanical seal 10, nor does it have a degrading effect on the seal. The chocolate is unable to displace the edible grease which acts as a buffer and thus the pump is reliably sealed even when the chocolate has caused some wear of the labyrinth header ring 6 and the lip seal 7.

Claims (4)

1. A pump having a rotor housed in a rotor housing and attached to a drive shaft passing through said rotor housing, the shaft being sealed to the housing by means of first and second seal means having an annular chamber formed therebetween, such annular chamber being filled with an edible grease, the second seal means being operative to prevent leakage of said grease from said chamber to the exterior of the pump.
2. A pump according to claim 1, wherein first seal means comprises a first seal ring and a lip seal, the chamber being located between the lip seal and the second seal means.
3. A pump according to claim 2, wherein said first seal ring is a labyrinth seal ring.
4. A pump incorporating a seal constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
4. A pump according to any one of the preceding claim, wherein the second seal means comprises a mechanical seal.
5. A pump according to claim 4 wherein said mechanical seal has a rotary portion sealed to the shaft by a rotary 0-ring and a stationary portion sealed to the housing by a stationary 0-ring.
6. A pump according to any preceding claim which is a rotary lobe pump suitable for pumping chocolate.
7. A composite shaft seal having first sealing means comprising a labyrinth header ring and a lip seal, and second sealing means comprising a mechanical seal ring, a chamber defined between said first and second sealing means being filled with an edible grease.
8. A seal according to claim 7 wherein said mechanical seal comprises a rotary portion sealed to the shaft by means of a rotary 0-ring and a stationary portion sealed to the seal housing by means of a stationary 0-ring.
9. A seal substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
10. A pump incorporating a seal according to any one of claims 7, 8 or 9.
Amendments to the claims have been filed as follows CLAIMS
1. A pump having a rotor housed in a rotor housing and attached to a drive shaft passing through said rotor housing, the shaft being sealed to the housing by means of first and second seal means having an annular chamber formed therebetween, said first seal means comprising a labyrinth seal ring and a lip seal, the chamber being located between the lip seal and the second seal means which itself comprises a mechanical seal, and said annular chamber being filled with an edible grease, the second seal means being operative to prevent leakage of said grease from said chamber to the exterior of the pump.
2. A pump according to claim 1, wherein said mechanical seal has a rotary portion sealed to the shaft by a rotary O-ring and a stationary portion sealed to the housing by a stationary O-ring.
3. A pump according to either preceding claim which is a rotary lobe pump suitable for pumping chocolate.
GB8705895A 1987-03-12 1987-03-12 Pump Expired - Fee Related GB2202005B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8705895A GB2202005B (en) 1987-03-12 1987-03-12 Pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8705895A GB2202005B (en) 1987-03-12 1987-03-12 Pump

Publications (3)

Publication Number Publication Date
GB8705895D0 GB8705895D0 (en) 1987-04-15
GB2202005A true GB2202005A (en) 1988-09-14
GB2202005B GB2202005B (en) 1990-11-07

Family

ID=10613840

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8705895A Expired - Fee Related GB2202005B (en) 1987-03-12 1987-03-12 Pump

Country Status (1)

Country Link
GB (1) GB2202005B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2247047A (en) * 1990-07-17 1992-02-19 Bombas Stork S A Shaft sealing in lobe rotor pump
EP0511608A1 (en) * 1991-04-27 1992-11-04 VEMAG Maschinenbau GmbH Feeder unit in a hopper, especially for a sausage stuffing machine
EP0602357A1 (en) * 1992-12-16 1994-06-22 Maag Pump Systems Ag Gear pump
US5924854A (en) * 1996-02-09 1999-07-20 Maag Pump Systems Ag Gear pump channel arrangement for tempering media
FR2967201A1 (en) * 2011-11-09 2012-05-11 Poclain Hydraulics Ind System for producing dynamic seal of hydrostatic motor to be mounted on wheel shaft of vehicle, has centering ring mounting dynamic lip seal floating on support plane with respect to shaft before its attachment to support plane
CN106286291A (en) * 2016-10-21 2017-01-04 宁波邦威泵业有限公司 Impeller pump shaft sealer
CN106286290A (en) * 2016-10-21 2017-01-04 宁波邦威泵业有限公司 The shaft sealer of impeller pump
CN107143495A (en) * 2017-06-27 2017-09-08 浙江力高泵业科技有限公司 A kind of mechanical seal structure of high pressure impeller pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111396560A (en) * 2020-04-01 2020-07-10 安徽亚兰密封件有限公司 Novel sealing combination device for high-risk occasions

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789680A (en) * 1955-04-21 1958-01-29 Parsons C A & Co Ltd Improvements in and relating to shaft sealing arrangements
GB931871A (en) * 1961-02-08 1963-07-17 Union Tank Car Co Fluid pump assembly
GB1161364A (en) * 1965-10-21 1969-08-13 Dresser Ind Temperature Detection Device
US3741679A (en) * 1971-09-17 1973-06-26 Blue Co John Centrifugal pump
US3816020A (en) * 1972-10-19 1974-06-11 Selgo Pumps Inc Pump
GB2018901A (en) * 1978-04-07 1979-10-24 Maag Zahnraeder & Maschinen Ag Rotary positive-displacement fluid-machines
US4342538A (en) * 1980-06-02 1982-08-03 The Gorman-Rupp Company Face-type shaft seal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789680A (en) * 1955-04-21 1958-01-29 Parsons C A & Co Ltd Improvements in and relating to shaft sealing arrangements
GB931871A (en) * 1961-02-08 1963-07-17 Union Tank Car Co Fluid pump assembly
GB1161364A (en) * 1965-10-21 1969-08-13 Dresser Ind Temperature Detection Device
US3741679A (en) * 1971-09-17 1973-06-26 Blue Co John Centrifugal pump
US3816020A (en) * 1972-10-19 1974-06-11 Selgo Pumps Inc Pump
GB2018901A (en) * 1978-04-07 1979-10-24 Maag Zahnraeder & Maschinen Ag Rotary positive-displacement fluid-machines
US4342538A (en) * 1980-06-02 1982-08-03 The Gorman-Rupp Company Face-type shaft seal

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2247047A (en) * 1990-07-17 1992-02-19 Bombas Stork S A Shaft sealing in lobe rotor pump
GB2247047B (en) * 1990-07-17 1994-05-04 Bombas Stork S A Lobe rotor pump
EP0511608A1 (en) * 1991-04-27 1992-11-04 VEMAG Maschinenbau GmbH Feeder unit in a hopper, especially for a sausage stuffing machine
US5352150A (en) * 1991-04-27 1994-10-04 Klaus Markwardt Feeding device installed in a loading bin, for special use in a sausage filling machine
EP0602357A1 (en) * 1992-12-16 1994-06-22 Maag Pump Systems Ag Gear pump
US5462420A (en) * 1992-12-16 1995-10-31 Maag Pump Systems Ag Gear pump
US5924854A (en) * 1996-02-09 1999-07-20 Maag Pump Systems Ag Gear pump channel arrangement for tempering media
FR2967201A1 (en) * 2011-11-09 2012-05-11 Poclain Hydraulics Ind System for producing dynamic seal of hydrostatic motor to be mounted on wheel shaft of vehicle, has centering ring mounting dynamic lip seal floating on support plane with respect to shaft before its attachment to support plane
WO2013068377A3 (en) * 2011-11-09 2014-04-17 Poclain Hydraulics Industrie Dynamic sealing set up for hydraulic rotary machine
CN106286291A (en) * 2016-10-21 2017-01-04 宁波邦威泵业有限公司 Impeller pump shaft sealer
CN106286290A (en) * 2016-10-21 2017-01-04 宁波邦威泵业有限公司 The shaft sealer of impeller pump
CN107143495A (en) * 2017-06-27 2017-09-08 浙江力高泵业科技有限公司 A kind of mechanical seal structure of high pressure impeller pump
CN107143495B (en) * 2017-06-27 2020-06-16 浙江力高泵业科技有限公司 Mechanical sealing structure of high-pressure rotor pump

Also Published As

Publication number Publication date
GB8705895D0 (en) 1987-04-15
GB2202005B (en) 1990-11-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930312