GB2106182A - Pressure accumulators - Google Patents

Pressure accumulators Download PDF

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Publication number
GB2106182A
GB2106182A GB08128319A GB8128319A GB2106182A GB 2106182 A GB2106182 A GB 2106182A GB 08128319 A GB08128319 A GB 08128319A GB 8128319 A GB8128319 A GB 8128319A GB 2106182 A GB2106182 A GB 2106182A
Authority
GB
United Kingdom
Prior art keywords
stem
pressure
chamber
valve
port
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
GB08128319A
Other versions
GB2106182B (en
Inventor
Stanley Edgar Otter
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.)
Fawcett Engineering Ltd
Original Assignee
Fawcett Engineering 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 Fawcett Engineering Ltd filed Critical Fawcett Engineering Ltd
Priority to GB08128319A priority Critical patent/GB2106182B/en
Publication of GB2106182A publication Critical patent/GB2106182A/en
Application granted granted Critical
Publication of GB2106182B publication Critical patent/GB2106182B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

In a poppet valve assembly 7 of a pressure accumulator 1 having a separator 2, the stem extends through a space 16 at atmospheric pressure, into a bore 29 in an extension 18 of the valve body 8. The stem is slidable in seals 15 on opposite sides of the space 16. A lateral projection 23 operates a microswitch 25 when the poppet valve closes and thus indicates when the liquid chamber 3 is substantially empty. A line 28 applies the accumulator pressure to the end of the bore 29 to balance the hydrostatic forces acting on the valve member. <IMAGE>

Description

SPECIFICATION Pressure accumulators The present invention relates to pressure accumulators of the kind comprising a rigid pressure vessel the interior of which is divided by a movable partition into two chambers each communicating with a respective port formed in the pressure vessel, one of the ports being controlled by a poppet valve movable, against a resilient bias, by the separator onto a seat surrounding the port in order to close the port and prevent extrusion of the separator through the port when all of the fluid in the chamber communicating with that port has been expelled from the pressure vessel.
In accordance with the present invention, an external indicator is coupled to a stem carrying the poppet valve head by means of a lateral projection on an intermediate portion of the stem situated in a space in the valve body communicating with the exterior, the valve stem is slidably sealed with respect to the body on each side of the said space and the fluid outlet pressure from the chamber communicating with the poppet valve is applied to the remote end of the poppet valve stem through a conduit.
With this arrangement, the static forces acting axially on the poppet valve member due to the pressure of the fluid in the said chamber are balanced. It is accordingly not necessary to adjust the resilient bias acting on the poppet valve member (for example by replacement of a coil spring surrounding the stem adjacent the valve head) whenever the working pressure is changed.
Thus, by coupling the projection to a suitable device such as a micro-switch, a reliable indication can be given each time the valve is closed as the result of all of the liquid within the chamber having been expelled.
The invention will now be further described by way of example with reference to the accompanying drawings in which the single figure is an axial sectional view of the liquid port of a pressure accumulator intended to supply liquid at a low rate to an external circuit.
The pressure accumulator of which part is shown in the drawing follows conventional practice in that it comprises a generally cylindrical shell having hemispherical ends, the lower end of which is shown at 1. The interior of the pressure vessel shell is divided into a gas chamber 2 and a liquid chamber 3 by a deformable partition in the form of a bladder 4. The gas chamber 2 is charged with gas under pressure through a gas valve (not shown) in the upper end of the pressure vessel shell.Secured in a port 5 in the lower end 1 of the pressure vessel shell, by conventional means 6 is a poppet valve assembly 7 consisting of a generally cylindrical body 8 the upper end of which forms a bevelled seat 9 for the heat 10 of the poppet valve member 11 having a stem 12 which extends through a cylindrical cavity 13 in the body 8 and as a close sliding fit in a bore 14 in the lower end of the body 8. An O-ring 1 5 located in a groove in the stem 12 makes sealed sliding contact with the bore wall 1 4.
A space 1 6 surrounds a portion of the length of the stem 12 and is defined by a cylindrical housing 17 and a bottom cap 18. The stem 12 extends through the space 16 into a bore 1 9 in the bottom cap 1 8 and a second O-ring 20 located in an annular groove in the stem 12 makes sliding sealing contact with the side wall of the bore 19.
The bottom cap 18 and the housing 17 are secured to the bottom face of the body 8 by set screws 21. Within the space 16, the stem 12 carries a collar 22 from which an arm 23 projects through a slot 24 in the housing 17 to engage a micro-switch 25, the arrangement being such that movement of the valve member 11 downwards onto its seat 9 causes the arm 23 to operate the micro-switch 25 the change the state of the latter.
Liquid to be stored in the chamber 3 is supplied from, and returned to, a line 26 which is connected to a transverse bore 27 in the body 8 leading into the cavity 13 from which the liquid has access to the chamber 3 through the seat 9. A branch line 28 leads from the line 26 into a chamber 29 formed by the lower end of the bore 19 and applies a counter-balancing force to the bottom end of the stem 12 thereby compensating the differences in areas subjected to fluid pressure of the top surface and under surface of the valve head 10. A light spring 30 is located between the underside of the valve head 10 and the top surface of a sleeve 31 surrounded by a clearance in the cavity 1 3.
When there is sufficient liquid in the chamber 3 to space the bladder 4 away from the valve head 10, the spring 30 holds the valve member 11 in its uppermost position with the collar 22 adjacent the bottom surface of the body 8. If the quantity of liquid in the chamber 3 is greatly reduced as a result of delivery to the line 26 (for example if a pump supplying the latter should have failed), the gas pressure in the chamber 2 expands the bladder 4 which comes into contact with the valve head 10 and begins to move the valve member 11 downwards against the light pressure of the spring 30, the forces exerted in the axial direction on the valve member 11 by the fluid pressure being balanced. As the valve closes and thereby avoids the risk of extrusion of the bladder 4 passed the valve head under the pressure of the gas in the chamber 2, the arm 23 is moved downwards to operate the micro-switch 25 which may operate an alarm or a standby pump or both.
Where greater liquid flow into and out of the chamber 3 is required, the line 26, bore 27 and cavity 13 will be of enlarged diameters, the latter containing a guide for the upper part of the valve stem.
1. A pressure accumulator comprising a rigid pressure vessel the interior of which is divided by a movable partition into two chambers each communicating with a respective port formed in
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pressure accumulators The present invention relates to pressure accumulators of the kind comprising a rigid pressure vessel the interior of which is divided by a movable partition into two chambers each communicating with a respective port formed in the pressure vessel, one of the ports being controlled by a poppet valve movable, against a resilient bias, by the separator onto a seat surrounding the port in order to close the port and prevent extrusion of the separator through the port when all of the fluid in the chamber communicating with that port has been expelled from the pressure vessel. In accordance with the present invention, an external indicator is coupled to a stem carrying the poppet valve head by means of a lateral projection on an intermediate portion of the stem situated in a space in the valve body communicating with the exterior, the valve stem is slidably sealed with respect to the body on each side of the said space and the fluid outlet pressure from the chamber communicating with the poppet valve is applied to the remote end of the poppet valve stem through a conduit. With this arrangement, the static forces acting axially on the poppet valve member due to the pressure of the fluid in the said chamber are balanced. It is accordingly not necessary to adjust the resilient bias acting on the poppet valve member (for example by replacement of a coil spring surrounding the stem adjacent the valve head) whenever the working pressure is changed. Thus, by coupling the projection to a suitable device such as a micro-switch, a reliable indication can be given each time the valve is closed as the result of all of the liquid within the chamber having been expelled. The invention will now be further described by way of example with reference to the accompanying drawings in which the single figure is an axial sectional view of the liquid port of a pressure accumulator intended to supply liquid at a low rate to an external circuit. The pressure accumulator of which part is shown in the drawing follows conventional practice in that it comprises a generally cylindrical shell having hemispherical ends, the lower end of which is shown at 1. The interior of the pressure vessel shell is divided into a gas chamber 2 and a liquid chamber 3 by a deformable partition in the form of a bladder 4. The gas chamber 2 is charged with gas under pressure through a gas valve (not shown) in the upper end of the pressure vessel shell.Secured in a port 5 in the lower end 1 of the pressure vessel shell, by conventional means 6 is a poppet valve assembly 7 consisting of a generally cylindrical body 8 the upper end of which forms a bevelled seat 9 for the heat 10 of the poppet valve member 11 having a stem 12 which extends through a cylindrical cavity 13 in the body 8 and as a close sliding fit in a bore 14 in the lower end of the body 8. An O-ring 1 5 located in a groove in the stem 12 makes sealed sliding contact with the bore wall 1 4. A space 1 6 surrounds a portion of the length of the stem 12 and is defined by a cylindrical housing 17 and a bottom cap 18. The stem 12 extends through the space 16 into a bore 1 9 in the bottom cap 1 8 and a second O-ring 20 located in an annular groove in the stem 12 makes sliding sealing contact with the side wall of the bore 19. The bottom cap 18 and the housing 17 are secured to the bottom face of the body 8 by set screws 21. Within the space 16, the stem 12 carries a collar 22 from which an arm 23 projects through a slot 24 in the housing 17 to engage a micro-switch 25, the arrangement being such that movement of the valve member 11 downwards onto its seat 9 causes the arm 23 to operate the micro-switch 25 the change the state of the latter. Liquid to be stored in the chamber 3 is supplied from, and returned to, a line 26 which is connected to a transverse bore 27 in the body 8 leading into the cavity 13 from which the liquid has access to the chamber 3 through the seat 9. A branch line 28 leads from the line 26 into a chamber 29 formed by the lower end of the bore 19 and applies a counter-balancing force to the bottom end of the stem 12 thereby compensating the differences in areas subjected to fluid pressure of the top surface and under surface of the valve head 10. A light spring 30 is located between the underside of the valve head 10 and the top surface of a sleeve 31 surrounded by a clearance in the cavity 1 3. When there is sufficient liquid in the chamber 3 to space the bladder 4 away from the valve head 10, the spring 30 holds the valve member 11 in its uppermost position with the collar 22 adjacent the bottom surface of the body 8. If the quantity of liquid in the chamber 3 is greatly reduced as a result of delivery to the line 26 (for example if a pump supplying the latter should have failed), the gas pressure in the chamber 2 expands the bladder 4 which comes into contact with the valve head 10 and begins to move the valve member 11 downwards against the light pressure of the spring 30, the forces exerted in the axial direction on the valve member 11 by the fluid pressure being balanced.As the valve closes and thereby avoids the risk of extrusion of the bladder 4 passed the valve head under the pressure of the gas in the chamber 2, the arm 23 is moved downwards to operate the micro-switch 25 which may operate an alarm or a standby pump or both. Where greater liquid flow into and out of the chamber 3 is required, the line 26, bore 27 and cavity 13 will be of enlarged diameters, the latter containing a guide for the upper part of the valve stem. CLAIMS
1. A pressure accumulator comprising a rigid pressure vessel the interior of which is divided by a movable partition into two chambers each communicating with a respective port formed in the pressure vessel, one of the ports being controlled by a poppet valve comprising a valve member movable, against a resilient bias, by the separator to bring a valve head of the valve member onto a seat surrounding the port in order to close the port and prevent extrusion of the separator through the port when all of the fluid in the chamber communicating with that port has been expelled from the pressure vessel, wherein an external indicator is coupled to a stem carrying the poppet valve head by means of a lateral projection on an intermediate portion of the stem situated in a space in the valve body communicating with the exterior and the valve stem is slidably sealed with respect to the body on each side of the said space and a conduit is provided for applying the fluid outlet pressure from the chamber communicating with the poppet valve to the remote end of the poppet valve stem.
2. A pressure vessel according to claim 1, wherein a micro-switch is operable by the projection.
3. A pressure vessel substantially as described with reference to the drawings.
GB08128319A 1981-09-18 1981-09-18 Pressure accumulators Expired GB2106182B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08128319A GB2106182B (en) 1981-09-18 1981-09-18 Pressure accumulators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08128319A GB2106182B (en) 1981-09-18 1981-09-18 Pressure accumulators

Publications (2)

Publication Number Publication Date
GB2106182A true GB2106182A (en) 1983-04-07
GB2106182B GB2106182B (en) 1985-09-18

Family

ID=10524603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08128319A Expired GB2106182B (en) 1981-09-18 1981-09-18 Pressure accumulators

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168364A1 (en) * 1984-05-24 1986-01-15 Atlas Copco Aktiebolag Hydraulic accumulator
WO1992021012A1 (en) * 1991-05-21 1992-11-26 Hydac Technology Gmbh Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method
GB2490771A (en) * 2011-04-26 2012-11-14 Water Powered Technologies Ltd Gas spring accumulator with port for communication with external pressure vessel and an indicator member

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168364A1 (en) * 1984-05-24 1986-01-15 Atlas Copco Aktiebolag Hydraulic accumulator
WO1992021012A1 (en) * 1991-05-21 1992-11-26 Hydac Technology Gmbh Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method
AU655020B2 (en) * 1991-05-21 1994-12-01 Hydac Technology Gmbh Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method
US5445034A (en) * 1991-05-21 1995-08-29 Hydac Technology Gmbh Method of measuring the pressure of a gas in a gas accumulator, and a gas accumulator for carrying out the method
GB2490771A (en) * 2011-04-26 2012-11-14 Water Powered Technologies Ltd Gas spring accumulator with port for communication with external pressure vessel and an indicator member
GB2490771B (en) * 2011-04-26 2017-12-27 Water Powered Tech Limited Gas spring accumulator

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Publication number Publication date
GB2106182B (en) 1985-09-18

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee