GB1344278A - Method and devices for regulating the pressure and its rate of variation in a chamber - Google Patents
Method and devices for regulating the pressure and its rate of variation in a chamberInfo
- Publication number
- GB1344278A GB1344278A GB2075671A GB2075671A GB1344278A GB 1344278 A GB1344278 A GB 1344278A GB 2075671 A GB2075671 A GB 2075671A GB 2075671 A GB2075671 A GB 2075671A GB 1344278 A GB1344278 A GB 1344278A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- valve
- chamber
- amplifier
- control
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Fluid Pressure (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
1344278 Automatic control of pressure; fluid pressure servomotor systems SOC NATIONALE INDUSTRIELLE AEROSPATIALE and SEMCA SOC ANON DES ATELIERS SEMCA 19 April 1971 [4 Feb 1970] 20756/71 Heading G3P and G3R In a method of regulating the pressure in an aircraft cabin &c. to which air or other pressure fluid is continuously supplied and which is situated in an atmosphere of variable pressure, the control is obtained from a single pressure sensor 1, Fig. 1 within the chamber which provides an electrical output proportional to the sensed pressure, the output being used to generate a control signal for at least one electric torque motor a valve which vents the chamber to atmosphere. In the embodiment described the sensor 1 may be of the membrane type functioning on the differential electrical capacitance principle to modulate the current from a 100 kHz oscillator 2a providing one input to a summing amplifier 15 from which a "corrected error signal" output controls the motor 29 through a further control amplifier 28 Fig. 2, modulator (30) Fig.3 (not shown) and tuned "power amplifier" (31). A valve position sensor 18a provides a feed-back control to the amplifier 28 in a circuit which includes rate gain and position gain potentionmetric circuits 25, 26 and a differentiating feed-back circuit 60, 24 whereby the control of the motor 29 is electrically damped to provide linearised progressive control. The pressure sensor 1 in Fig. 1 may alternatively consist of a strain-gauge bridge on a pressure sensitive membrane producing variable D.C. current proportional to the pressure and coupled directly to a preamplifier 3. Sensor temperature compensation may be obtained by a unit 4. The output is fed through a differentiating amplifier 5 and filtering amplifier 6 to provide one input to the summing "error signal" amplifier 15. A second input is provided via a further differentiating amplifier 7 to give an "anticipation signal". The third input to the amplifier is a "corrected preset rate signal" initiated by a D.C. signal from a pressure preset circuit 9 operating in conjunction with a compensating amplifier 8 and switching relays 10, 11 to provide inputs to an "adding and rate presetting adjustable potentiometric circuit 13. The servomotor may control a butterfly valve, but in the particular embodiment applied to a system used to control the pressure in an aircraft cabin by the movements of a pneumatic servo-control valve, Fig. 4, the electric torque motor 29 opens or closes jets 37, 38 associated respectively with the higher pressure in the chamber to be controlled and with a preset lower pressure as determined by an over-pressure valve 40. Controlled opening of the jets 37, 38 varies the pressure in valve chamber 43 whereby movable bell-shaped valve plate 43b mounted on guide rod 43j sealed by flexible annular membranes 43e, 43h, may open against spring 43s to vent the pressurised chamber through grid space 43f and venturi 52. The underside of plate 43b is maintained at the pressure of the chamber through vents 43i. The plate 43b is coupled to a position sensor 18a forming part of the feed-back circuit. Fig. 2 The valve plate 43b may also be forcibly opened and closed by a power operated means comprising rack and pinion system 46, 46a driven by a separate electric motor (not shown), the rack being held in the open position by a latch 49 under the control of a microswitch 53 when the aircraft cabin is to be ventilated on the ground with its doors open. The microswitch 53 also controls reversing of the motor driven rack and pinion system 46, 46a whereby in the event of the aircraft alighting on the sea the rack 46a may be driven to an irreversibly locked position to hold the valve 43b against water pressure. Capsule valves 45, 47 mounted on the fixed top plate 43a with their capsules connected to the pressurised chamber and their casings vented to the external atmospheric are provided to limit the chamber pressure to a preset excess overpressure and automatically vent the valve chamber 43 to the low pressure system 40 and thereby cause the valve 43b to open . A capsule or bellows valve 48 vented internally to atmosphere and having its casing connected to the pressurised chamber similarly prevents underpressure in the pressurised chamber. In this event the valve 48 opens to vent the chamber 43 to the controlled pressurised chamber whereby the valve 43b is caused to close. Further since the vent passageways are of larger crosssection than that of the total cross-sections communicating with the low pressure system 40 the valve 43b remains closed below a preset altitude. Valve 43b is further caused to open automatically in the event of a rapid descent of the aircraft when the pressure in the cabin becomes lower than the outside pressure. In this event check valve 42 closes and the valve chamber 43 is connected to the cabin interior via valve 39, the lower pressure system no longer being operable. The valve 43b is thereby caused to open due to the external pressure acting on plate 51 which engages the underside of plate 43b.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7003867A FR2079527A5 (en) | 1970-02-04 | 1970-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1344278A true GB1344278A (en) | 1974-01-16 |
Family
ID=9050049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2075671A Expired GB1344278A (en) | 1970-02-04 | 1971-04-19 | Method and devices for regulating the pressure and its rate of variation in a chamber |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2103920C3 (en) |
FR (1) | FR2079527A5 (en) |
GB (1) | GB1344278A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107748040A (en) * | 2017-11-17 | 2018-03-02 | 扬州曙光光电自控有限责任公司 | A kind of sealing Withstand test device of adjustable hydraulic pressure |
CN112616199A (en) * | 2020-12-01 | 2021-04-06 | 上海数捷电气有限公司 | Constant temperature type position measurement sensor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3042951C2 (en) * | 1980-11-14 | 1986-04-10 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Method for controlling a valve on pressurized systems |
DE3343487A1 (en) * | 1983-12-01 | 1985-06-13 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | DEVICE FOR VENTILATION AND AIR CONDITIONING OF PASSENGER ROOMS IN RAIL VEHICLES |
-
1970
- 1970-02-04 FR FR7003867A patent/FR2079527A5/fr not_active Expired
-
1971
- 1971-01-28 DE DE2103920A patent/DE2103920C3/en not_active Expired
- 1971-04-19 GB GB2075671A patent/GB1344278A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107748040A (en) * | 2017-11-17 | 2018-03-02 | 扬州曙光光电自控有限责任公司 | A kind of sealing Withstand test device of adjustable hydraulic pressure |
CN107748040B (en) * | 2017-11-17 | 2024-01-16 | 扬州曙光光电自控有限责任公司 | Sealing pressure-resistant test device capable of adjusting water pressure |
CN112616199A (en) * | 2020-12-01 | 2021-04-06 | 上海数捷电气有限公司 | Constant temperature type position measurement sensor |
Also Published As
Publication number | Publication date |
---|---|
DE2103920C3 (en) | 1980-06-26 |
DE2103920B2 (en) | 1979-09-27 |
FR2079527A5 (en) | 1971-11-12 |
DE2103920A1 (en) | 1971-08-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |