EP0206132A2 - Interrupteur commandé en fonction de la pression - Google Patents

Interrupteur commandé en fonction de la pression Download PDF

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Publication number
EP0206132A2
EP0206132A2 EP86107993A EP86107993A EP0206132A2 EP 0206132 A2 EP0206132 A2 EP 0206132A2 EP 86107993 A EP86107993 A EP 86107993A EP 86107993 A EP86107993 A EP 86107993A EP 0206132 A2 EP0206132 A2 EP 0206132A2
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
membrane
control membrane
valve
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
EP86107993A
Other languages
German (de)
English (en)
Other versions
EP0206132A3 (en
EP0206132B1 (fr
Inventor
Hendrikus Berkhof
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.)
Honeywell BV
Original Assignee
Honeywell BV
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 Honeywell BV filed Critical Honeywell BV
Publication of EP0206132A2 publication Critical patent/EP0206132A2/fr
Publication of EP0206132A3 publication Critical patent/EP0206132A3/de
Application granted granted Critical
Publication of EP0206132B1 publication Critical patent/EP0206132B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/247—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using mechanical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2692—Details comprising pneumatic snap-action
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers

Definitions

  • the invention relates to pressure-controlled switches according to the preamble of claim 1. If such switches are used to monitor low pressures, a relatively large membrane must be provided to generate the required switching force. In addition, the exact adjustment of such low pressure switches and the maintenance of the setting once made difficulties over long periods of time, because in view of the low pressure, even small changes in the membrane properties, for example as a result of aging, or methane hysteresis in the switch actuation mechanism can lead to noticeable changes in the response behavior of the switch.
  • the object of the invention is to remedy this situation and to propose a pressure-dependent controlled switch, in particular for monitoring low pressures, which takes up little space, is easily adjustable and does not require high-precision individual parts and complicated adjustment processes in production.
  • This object is achieved by the invention characterized in claim 1. It makes use of the principle of pressure amplification known in servo pressure regulators, but this leads to additional monitoring options, namely the simultaneous monitoring of several functions.
  • Advantageous refinements and preferred applications of the invention result from the subclaims.
  • a working membrane 3 is clamped on its outer circumference between a housing base 1 and a base plate 2. It carries on its membrane plate 4 a pin 5 which acts on the plunger 7 of a snap switch 8 via a lever 6.
  • a return spring 9 is supported on an adjustable screw 10 in the housing. The force of the spring 9 counteracts the pressure P s prevailing in the membrane chamber 11.
  • This control pressure Ps arises in the line 12 between the membrane chamber 11 and a blow-off valve 13, to which a supply pressure P c , for example the pressure of a gas supply line, is supplied via a throttle point 14.
  • the blow-off valve 13 consists of a plate-shaped valve seat 15 and an annular closing body 16 which is fastened to the underside of a control membrane 17.
  • the closing body 16 has a diameter d , while the membrane 17 has a larger diameter d 2 .
  • the valve seat 15 is clamped together with the membrane 17 in a sealed manner between the housing part 1 and a cap 18, the closure 19 of which has a connection 20 for the pressure P M to be monitored.
  • An opening 21 in the valve seat plate 15 represents a connection between the space lying outside the valve seat above and below the valve plate 15. This space is connected to a blow-off line 22.
  • the pressure switch ensures, for example, that the gas supply to the burner is only opened when a fan providing the combustion air generates a sufficient combustion air pressure.
  • This combustion air pressure P M to be monitored is fed via the connection 20 into the chamber 24 above the membrane 17 and presses the membrane 17 downward.
  • the control pressure in the line 12 and the membrane chamber 11 thus increases.
  • the membrane 3 is moved together with the pin 5 and the lever 6 is pivoted clockwise.
  • the tappet 7 actuates the switch 8. This releases the gas supply to the burner via the solenoid valve mentioned.
  • the pressure-controlled switch according to FIG. 1 not only monitors the combustion air pressure P M , but at the same time also the supply gas pressure P G , because without such, no working pressure moving the membrane 3 and with it the pin 5 can build up in the channel 12 and in the membrane chamber 11.
  • both the combustion air pressure to be monitored and the gas supply pressure can be monitored with a single pressure-operated switch.
  • the control pressure P s acting in the chamber 11 is thus increased by a factor compared to the pressure to be monitored, which factor depends both on the level of the gas supply pressure P ⁇ and on the ratio of the effective membrane areas S, and S2.
  • This pressure boost makes it possible to generate the force required to actuate the switch 8 with a diaphragm 3 of a much smaller diameter than would be the case if the pressure P M were passed directly into the diaphragm chamber 11.
  • the adjusting screw 10 allows a precise adjustment of the response pressure.
  • FIG. 2 shows a switch which is controlled as a function of the differential pressure and its use for monitoring a gas-heated water heater with a fan burner.
  • a second control membrane 32 which transmits its force to the first control membrane 17 via a spring 33, is arranged here in a housing 31 placed on the cap 18.
  • the cup-shaped housing 31 has a pressure inlet 40.
  • the plunger 35 of which is actuated by a lever 36 through the end of the pin 5.
  • the lever 36 is pretensioned by a spring 37 which is supported on an adjusting screw 38.
  • the inlet 23 is connected to a gas supply line 42 via a safety valve 41. .
  • a gas control device 43 controls the gas supply to the combustion chamber 44 as a function of the heat requirement.
  • the blow-off line 22 opens into the lower part of the combustion chamber 44.
  • the blower 45 generates combustion air at a pressure P and blows it into the combustion chamber 44.
  • the combustion air pressure also reaches the inlet chamber 39 of the cup-shaped housing 31 via the line 40 and thus acts on the membrane 32.
  • the heat exchanger 46 is flowed through by the water to be heated.
  • the line 48 opens into the combustion chamber 44 and transmits the pressure P2 prevailing at the outlet of the combustion chamber 44 via the line 48 and the inlet 20 into the control chamber 24 between the membranes 32 and 17.
  • An operating contact of the switch 8 is in turn in the excitation circuit of a gas solenoid valve, for example an on-off valve within the gas regulator 43.
  • the switch 34 has a normally closed contact which can be switched on in the same excitation circuit or in another gas valve.
  • the gas supply pressure P G and, on the other hand, the combustion air pressure P are present.
  • the pressure P 2 at the outlet of the combustion chamber 44 also acts on the membranes 17 and 32. Corresponding to the membrane surface of the membrane 32, this creates a force on the membrane 32 which is opposite to the pressure P, and a force supporting the force of the spring 33 corresponds to the membrane surface of the membrane 17. In this way, the flow of combustion and exhaust gases through the combustion chamber 44 can be monitored. If, for example, the gas passage cross sections are narrowed within the heat exchanger due to deposits, the pressure P 1 increases, while the pressure P decreases. This means that the pressure difference P, -P 2 becomes larger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Fluid-Driven Valves (AREA)
EP86107993A 1985-06-15 1986-06-11 Interrupteur commandé en fonction de la pression Expired - Lifetime EP0206132B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521646 1985-06-15
DE19853521646 DE3521646A1 (de) 1985-06-15 1985-06-15 Druckabhaengig gesteuerter schalter

Publications (3)

Publication Number Publication Date
EP0206132A2 true EP0206132A2 (fr) 1986-12-30
EP0206132A3 EP0206132A3 (en) 1989-05-24
EP0206132B1 EP0206132B1 (fr) 1991-10-16

Family

ID=6273474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107993A Expired - Lifetime EP0206132B1 (fr) 1985-06-15 1986-06-11 Interrupteur commandé en fonction de la pression

Country Status (3)

Country Link
US (1) US4692574A (fr)
EP (1) EP0206132B1 (fr)
DE (2) DE3521646A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132500A (en) * 1991-02-11 1992-07-21 Micro Pneumatic Logic, Inc. Differential pressure switch with sealed contacts
US7718907B2 (en) * 2007-04-12 2010-05-18 Condor-Werke Gebr. Frede Gmbh & Co. Kg. Combination pressure switch
DE202014005632U1 (de) 2013-02-07 2014-09-08 Knocks Fluid-Technik GmbH Schaltelement
US10502340B2 (en) 2015-08-17 2019-12-10 Honeywell International Inc. System for a valve setup
TWI576542B (zh) * 2016-04-15 2017-04-01 Safety valves for combustion installations

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953657A (en) * 1957-03-12 1960-09-20 Moore Products Co Pneumatic-electric relay

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103077B (de) * 1959-12-08 1961-03-23 Daimler Benz Ag Anzeigevorrichtung fuer den OEldruck in Brennkraftmaschinen
FR2071261A5 (fr) * 1969-12-23 1971-09-17 British Petroleum Co
US3852547A (en) * 1973-08-24 1974-12-03 H Dietz Differential pressure switch with hinged plate on diaphragm
US4217471A (en) * 1978-03-17 1980-08-12 Ulbing Otmar M Fluidic actuator for a switching device
US4330695A (en) * 1980-02-27 1982-05-18 General Electric Company Control device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953657A (en) * 1957-03-12 1960-09-20 Moore Products Co Pneumatic-electric relay

Also Published As

Publication number Publication date
US4692574A (en) 1987-09-08
EP0206132A3 (en) 1989-05-24
DE3521646A1 (de) 1986-12-18
DE3681972D1 (de) 1991-11-21
EP0206132B1 (fr) 1991-10-16

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