GB2481991A - Hydraulic motor assemblies for subsea use - Google Patents

Hydraulic motor assemblies for subsea use Download PDF

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Publication number
GB2481991A
GB2481991A GB1011742.2A GB201011742A GB2481991A GB 2481991 A GB2481991 A GB 2481991A GB 201011742 A GB201011742 A GB 201011742A GB 2481991 A GB2481991 A GB 2481991A
Authority
GB
United Kingdom
Prior art keywords
opening
hydraulic motor
cover
shaft
pressure
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
GB1011742.2A
Other versions
GB201011742D0 (en
GB2481991B (en
Inventor
Nicholas Long
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.)
Freudenberg Oil and Gas Technologies Ltd
Original Assignee
Vector International 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 Vector International Ltd filed Critical Vector International Ltd
Priority to GB1011742.2A priority Critical patent/GB2481991B/en
Publication of GB201011742D0 publication Critical patent/GB201011742D0/en
Publication of GB2481991A publication Critical patent/GB2481991A/en
Application granted granted Critical
Publication of GB2481991B publication Critical patent/GB2481991B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602—Component parts, details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/006—Sealings comprising at least two sealings in succession with division of the pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/006—Compensation or avoidance of ambient pressure variation

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Motors (AREA)

Abstract

An assembly includes; a cover which is statically sealed over an opening in a cover of a hydraulic motor 1 adapted to receive one end 3 of a shaft 4 to be driven and dynamically sealed to the shaft which passes through it; and a pressure compensator 9 which in use is filled with oil and when used in a subsea location supplies oil to the opening to equalize the pressure within said opening to the surrounding sea pressure. Thus the seals have only minor pressure differences to cope with allowing deep sea operation. The compensator is subjected to the pressure of the sea and may include a flexible expansion envelope or a piston. A clamp connector (figure 6) includes a mounting plate (14, figure 6), on which the cover and the pressure compensator are mounted, and a shaft in the form leadscrew (31, figure 6) which draws together or moves apart linked clamp segments (32-34, figure 6) when the motor is operated.

Description

Hydraulic motor assemblies for subsea use Hydraulic motors suitable for marine use and which are provided with an opening adapted to receive a shaft to be driven are well known. The seals within such motors are generally not able to withstand high pressures found in deep sea operations, and thus such motors are generally not suitable without modification for use in deep sea locations.
The object of the present invention is to provide a hydraulic motor assembly suitable for use in deep sea locations and a clamp connector incorporating the same.
The present invention proposes in a first aspect a hydraulic motor assembly comprising a hydraulic motor having in a casing portion thereof an opening adapted to receive one end of a shaft to be driven; a cover adapted to be fitted onto said casing portion over said opening; an aperture in said cover through which the shaft can pass; first seal means adapted to form, between said cover and said casing portion, an annular seal surrounding said opening; second seal means adapted to form an annular seal between said aperture and said shaft; and a pressure compensator adapted to substantially equalizes the pressure within said opening to that of the environment in which the assembly is located.
The present invention proposes in a second aspect a hydraulic motor assembly comprising a cover adapted to be fitted onto a casing portion of a hydraulic motor having in said casing portion an opening adapted to receive one end of a shaft to be driven; an aperture in said cover through which the shaft can pass; first seal means adapted to form, between said cover and said casing portion, an annular seal surrounding said opening; second seal means adapted to form an annular seal between said aperture and said shaft; and a pressure compensator adapted to substantially equalizes the pressure within said opening to that of the environment in which the assembly is located.
The pressure compensator preferably comprises a flexible expansion envelope the interior of which is connected to said opening; and a vent which exposes the exterior of the envelope to pressure within the environment in which the assembly is located.
Alternatively the pressure compensator comprises a piston and cylinder arrangement; the interior of the cylinder on one side of the piston being connected to said opening, and on the other side to a vent leading to the environment in which the assembly is located.
In use, spaces within said opening are filled with hydraulic oil which is supplied by said compensator. In consequence, when used in a subsea location, the pressure within said opening is substantially equal to the surrounding sea pressure. Thus said first and second seal means have only minor pressure differences to cope with allowing deep sea operation.
Said first seal means may comprise a pair of seals which operate in tandem.
Said second seal means may comprise a pair of seals which operate in tandem.
Preferably in either aspect the cover and the pressure compensator are mounted on a mounting plate.
The present invention proposes in a third aspect a clamp connector including a hydraulic motor assembly according to any of the above aspects; said clamp connector further comprising a mounting plate assembly which includes a mounting plate on which said cover and said pressure compensator are mounted, linked clamp segments movably mounted on said mounting plate assembly and a leadscrew which draws together and moves apart said linked clamp segments; said leadscrew being said shaft.
This has the advantage that the mounting plate assembly serves to couple the torque reaction produced when the shaft is driven back to said cover and thus to the casing portion of the motor.
The invention will now be described solely by way of example and with reference to the accompanying drawings in which: Figure 1 shows a left cross sectional view of a hydraulic motor assembly, Figure 2 portion E of Figure 1 in more detail, Figure 3 shows a right view of the assembly, Figure 4 shows a rear view of the assembly, Figure 5 shows a cross sectional view along the line A -A of Figure 3, Figure 6 shows a deep sea clamp connector incorporating a hydraulic motor assembly as shown in Figures 1 to 5.
As shown a hydraulic motor assembly includes a hydraulic motor 1 having in a casing portion thereof an opening 2 adapted to receive one end 3 of a shaft 4 to be driven. A cover 5 is adapted to be fitted onto said casing portion over said opening. The cover is provided with a circular aperture 6 through which the shaft passes. A first seal means, in the form of at least one 0-ring located in an annular groove 7 in said cover and coaxial with or otherwise surrounding said aperture forms an annular seal between said cover and said casing portion. The first seal means surrounds said opening and thus defines a limit of a region within said cover. As shown the first seal means comprises a pair of concentric seals (each comprising an 0-ring in its groove) which operate in tandem. A second seal means, in the form of at least one annular ring located in an annular groove in an inner wall of said aperture forms an annular seal between said aperture and said shaft. The second seal means thus defines a further limit of said region. As shown the second seal comprises a pair of seals, each in the form of at least one rod seal located in a corresponding annular groove 8. The grooves 8 are axially displaced along the length of the shaft. The second seal means thus also comprises a pair of seals connected in tandem.
A pressure compensator 9 is connected by a pipe 10 and a duct 11 in the coverS to the interior of said opening. The compensator is adapted to substantially equalize the pressure in said region and within said opening to that of the environment in which the assembly is located. The pressure compensator preferably comprises a flexible expansion envelope the interior of which is connected to said opening 2, and a vent 12 which exposes the exterior of the envelope to pressure within the environment in which the assembly is located. In use, spaces within said region and said opening are filled with hydraulic oil which is suppIied by said compensator. n consequence, when used in a subsea location, the pressure within said opening is substantially equal to the surrounding sea pressure. Thus said first and second seal means have only minor pressure differences to cope with allowing deep sea operation. If either of a pair of tandem seals fails the other seal of that pair should still be able to provide a fully effective seal.
The pressure compensator may alternatively comprises a piston and cylinder arrangement; the interior of the cylinder on one side of the piston being connected to said opening, and on the other side via a vent to the environment in which the assembly is located.
As best shown in Figures 3 -5, the cover 5 is attached to a casing portion of the motor 1 by bolts 13.
The cover 5 has a projecting tongue 15 which fits in a groove 16 in a plate 14. This prevents relative rotation between the cover and the plate. The cover is attached to the plate by bolts 17 which fit through slots 18 in the plate allowing some lateral movement of the motor relative to the plate which has an elongate aperture 19 through which the shaft 4 to be driven passes. The end 3 of the shaft which fits into the motor is hexagonal or splined. As shown a hexagonal end is provided and the motor which is constructed to drive a shaft with a splined end is fitted with a splined to hex adapter 20.
As shown the pressure compensator 9 is attached to the plate 14 by a clamp 21. Before use the envelope, pipe, said region and said opening in the hydraulic motor are filled with oil so as to provide an oil bath with substantially no air spaces therein. The vent 12 in the compensator allows, when the arrangement is used at a subsea location, the pressure in the surrounding sea to be exerted on the exterior of the envelope. In consequence the pressure in the oil is substantially equal to the surrounding sea pressure and the first and second seal means have substantially no or only minor pressure differences to cope with allowing deep sea operation.
The plate 14 may form part of a mounting plate assembly of a mechanism including a shaft t be driven.
Figure 6 shows a deep sea clamp connector which can be closed and opened by actuation of the hydraulic motor. The shaft 4 is a leadscrew which draws together and moves apart (according to the direction in which the shaft is driven) linked clamp segments 32, 33 and 34 mounted via pin and slot connections on said mounting plate assembly. Internally threaded collets 35, which simultaneously move towards or away from each other along threaded portions of the Ieadscrew, rotate relative to the otherwise free ends of links 32 and 34 to close or open the clamp which may serve to couple flanged ends of two pipes together. The mounting plate assembly couples the torque reaction produced when the shaft is driven back to said cover and thus to the casing portion of the motor.

Claims (9)

  1. Claims 1. A hydraulic motor assembly comprising a hydraulic motor having in a casing portion thereof an opening adapted to receive one end of a shaft to be driven; a cover adapted to be fitted onto said casing portion over said opening; an aperture in said cover through which the shaft can pass; first seal means adapted to form, between said cover and said casing portion, an annular seal surrounding said opening; second seal means adapted to form an annular seal between said aperture and said shaft; and a pressure compensator adapted to substantially equalizes the pressure within said opening to that of the environment in which the assembly is located.
  2. 2. A hydraulic motor assembly comprising a cover adapted to be fitted onto a casing portion of a hydraulic motor having in said casing portion an opening adapted to receive one end of a shaft to be driven; an aperture in said cover through which the shaft can pass; first seal means adapted to form, between said cover and said casing portion, an annular seal surrounding said opening; second seal means adapted to form an annular seal between said aperture and said shaft; and a pressure compensator adapted to substantially equalizes the pressure within said opening to that of the environment in which the assembly is located.
  3. 3. A hydraulic motor assembly as claimed in claim 1 or claim 2 and in which the pressure compensator comprises a flexible expansion envelope the interior of which is connected to said opening; and a vent which exposes the exterior of the envelope to pressure within the environment in which the assembly is located.
  4. 4. A hydraulic motor assembly as claimed in any one of claims 1 to 3
  5. 5. A hydraulic motor assembly as claimed in any one of claims 1 to 3 and in which the pressure compensator comprises a piston and cylinder arrangement; the interior of the cylinder on one side of the piston being connected to said opening, and on the other side to a vent leading to the environment in which the assembly is located.
  6. 6. A hydraulic motor assembly as claimed in any preceding claim and in which said first seal means comprises a pair of seals which operate in tandem.
  7. 7. A hydraulic motor assembly as claimed in any preceding claim and in which said second seal means comprises a pair of seals which operate in tandem.'
  8. 8. A hydraulic motor assembly as claimed in any preceding claim and in which said cover and said pressure compensator are mounted on a mounting plate.
  9. 9. A clamp connector including a hydraulic motor assembly according to any of claims 1 to 7; said clamp connector further comprising a mounting plate assembly which includes a mounting plate on which said cover and said pressure compensator are mounted, linked clamp segments movably mounted on said mounting plate assembly and a leadscrew which draws together and moves apart said linked clamp segments; said leadscrew being said shaft.
GB1011742.2A 2010-07-13 2010-07-13 Hydraulic motor assemblies for subsea use Active GB2481991B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1011742.2A GB2481991B (en) 2010-07-13 2010-07-13 Hydraulic motor assemblies for subsea use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1011742.2A GB2481991B (en) 2010-07-13 2010-07-13 Hydraulic motor assemblies for subsea use

Publications (3)

Publication Number Publication Date
GB201011742D0 GB201011742D0 (en) 2010-08-25
GB2481991A true GB2481991A (en) 2012-01-18
GB2481991B GB2481991B (en) 2012-11-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2526295A (en) * 2014-05-19 2015-11-25 Freudenberg Oil & Gas Technologies Ltd Subsea clamp connector and pipeline joint
US9890615B1 (en) * 2017-03-09 2018-02-13 Onesubsea Ip Uk Limited Clamping system having mechanical advantage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109238877A (en) * 2018-09-20 2019-01-18 中南大学 The complete deep cross plate shearing instrument in sea
CN111471576B (en) * 2020-05-22 2023-03-14 杭州电子科技大学 From deep sea microorganism normal position culture apparatus of taking pressure compensation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2078878A (en) * 1980-06-26 1982-01-13 Toyo Denki Kogyosho Co Ltd Improvements in or relating to methods of and arrangements for controlling the pressure acting on shaft-sealing parts of apparatuses
US5367214A (en) * 1992-11-18 1994-11-22 Turner Jr John W Submersible motor protection apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2078878A (en) * 1980-06-26 1982-01-13 Toyo Denki Kogyosho Co Ltd Improvements in or relating to methods of and arrangements for controlling the pressure acting on shaft-sealing parts of apparatuses
US5367214A (en) * 1992-11-18 1994-11-22 Turner Jr John W Submersible motor protection apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2526295A (en) * 2014-05-19 2015-11-25 Freudenberg Oil & Gas Technologies Ltd Subsea clamp connector and pipeline joint
GB2526295B (en) * 2014-05-19 2016-09-28 Freudenberg Oil & Gas Tech Ltd Subsea clamp connector and pipeline joint
US9890615B1 (en) * 2017-03-09 2018-02-13 Onesubsea Ip Uk Limited Clamping system having mechanical advantage

Also Published As

Publication number Publication date
GB201011742D0 (en) 2010-08-25
GB2481991B (en) 2012-11-14

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