EP0389782B1 - Einrichtung zum Steuern der Gaszufuhr zu einem Brenner eines gasbeheizten Gerätes, insbesondere eines Durchlauf-Wassererhitzers - Google Patents

Einrichtung zum Steuern der Gaszufuhr zu einem Brenner eines gasbeheizten Gerätes, insbesondere eines Durchlauf-Wassererhitzers Download PDF

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Publication number
EP0389782B1
EP0389782B1 EP90103184A EP90103184A EP0389782B1 EP 0389782 B1 EP0389782 B1 EP 0389782B1 EP 90103184 A EP90103184 A EP 90103184A EP 90103184 A EP90103184 A EP 90103184A EP 0389782 B1 EP0389782 B1 EP 0389782B1
Authority
EP
European Patent Office
Prior art keywords
valve
gas
stroke
valve seat
sealing lip
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 - Lifetime
Application number
EP90103184A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0389782A2 (de
EP0389782A3 (de
Inventor
Hans Hoeness
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0389782A2 publication Critical patent/EP0389782A2/de
Publication of EP0389782A3 publication Critical patent/EP0389782A3/de
Application granted granted Critical
Publication of EP0389782B1 publication Critical patent/EP0389782B1/de
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
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/087—Regulating fuel supply conjointly with another medium, e.g. boiler water using mechanical means

Definitions

  • the invention relates to a device for controlling the gas supply according to the preamble of the main claim.
  • the arrangement of a snap-in additional valve to the main valve prevents creeping release of small amounts of gas if the stroke actuator has only carried out a small actuating stroke in the case of severely restricted draw quantities or small setpoint deviations of the regulated water temperature.
  • the gas supply is only released when the actuating stroke of the stroke actuator corresponds at least approximately to the quantity of pilot gas required to safely ignite the entire burner.
  • the snap-opening and closing additional valve is arranged within the housing-like closing element of the main valve, which forms an valve ring for the additional valve on an inner annular shoulder, the closing element of which has its own closing spring and is influenced by a mechanical snap disk, via which the stroke actuator on both valves acts.
  • This version consists of a large number of individual parts, the assembly of which requires considerable manufacturing effort.
  • a valve actuated by a bimetal thermostat is known, the resiliently suspended closure part of which carries a membrane which can be pivoted against a valve seat fixed to the housing and which is snapped onto by the venturi effect.
  • the arrangement according to the invention with the characterizing features of the main claim is distinguished from the known device of the generic type by a much simpler structure, which consists of fewer individual parts and requires less manufacturing effort when assembling the valves.
  • FIG. 1 shows, as a first embodiment, a longitudinal section through a device according to the invention, which is combined with a lack of water protection of a water heater
  • FIGS. 2 and 3 each show a partial longitudinal section through the second and third embodiment.
  • the device 10 according to FIG. 1 is attached to a low water protection device 11, which actuates the device 10 continuously or modulatingly in accordance with the water flow via a plunger 12.
  • the device 10 has a valve housing 13 with a gas inlet opening 14, which leads into an input chamber 15. This is closed at the top by an insert 16 which contains a bore 17 and has a flange 18 on which a rubber sealing collar 19 is clamped. This is provided on the upper end face with an annular bead 20 which forms a valve seat for a closing member 21, which is provided with an annular flange 21a pressed against the annular bead 20 by a closing spring 22.
  • the closing member 21 is provided with a central control body 24 which, in the closed position shown, dips into the bore 17 with a cylindrical section 25.
  • the cylindrical section 25 is followed by a conically tapered section 26 which passes through the bore 17 over the entire stroke of the closing member 21.
  • the closing member 21 is fixedly connected to an actuating rod 27 which is guided in the valve housing 13 and rests below on the plunger 12 of the low water protection device 11.
  • An outlet chamber 28 is formed downstream of the valve seat 20, from which the gas reaches the burner of the device.
  • the closing member 21 forms with the valve seat 20 a main valve, upstream of which a snap valve, generally designated by the reference number 32, is connected upstream as an additional valve.
  • This has as the valve seat an annular edge 33 formed on the closing member 21, which, as a sealing element, is associated with a sealing lip 34 which is integrally formed on the sealing sleeve 19 and projects freely inwards is.
  • the sealing lip 34 protrudes approximately horizontally from the sealing collar 19; the arrangement is such that in the closed position of the main valve 30, the sealing lip 34 is slightly bent downward relative to the undeformed position, so that essentially the inflow-side gas pressure presses the sealing lip 34 against the ring edge 33 with sufficient sealing force.
  • the device according to FIG. 1 works as follows:
  • the lack of water safety device 11 raises the closing member 21 more or less depending on the amount of water flowing through per unit of time via the plunger 12 and the actuating rod 27.
  • the main valve 30 is already opened with very small amounts of water, whereas the snap valve 32 only suddenly releases the gas passage when a sufficient amount of gas for safely igniting the burner can pass through the valves. This is achieved in that the sealing lip 34 is initially held tightly against the ring edge 33 of the closing member 21 under the influence of the inflow-side gas pressure.
  • the inflow-side gas pressure deforms the sealing lip 34 upwards, its restoring force increasing continuously until it can no longer be overcome by the gas pressure.
  • the sealing lip 34 then springs off from the ring edge 33 with elastic resilience and returns to its undeformed initial position, in which the gas path is released through the snap valve. Then the amount of gas passing through both valves is determined by the stroke of the closing member 21 in conjunction with the control gap released in the bore 17.
  • the arrangement can advantageously be such that when tearing off the sealing lip 34 from the ring edge 33 there is still the cylindrical section 25 of the control body 24 in the bore 17.
  • the ring edge 33 of the closing member 21 first approaches the undeformed sealing lip 34 until the flow at the sealing lip 34 pulls it against the ring edge 33.
  • the gas supply to the burner is suddenly interrupted, which is also desirable in view of the proper functioning of the device.
  • the closing member 21 comes to rest on the valve seat 20, after which the main valve 30 is closed.
  • a closing member 41 actuated by the actuating rod 27 is designed as a carrier of a sealing washer 42, which forms an elastically bendable sealing lip 44 which projects outward.
  • a valve housing 45 On a valve housing 45, two valve seats are provided by two ring edges 46 and 47 arranged concentrically to one another, of which the inner ring edge 46 is assigned to the inner ring region of the sealing disk 42, which is supported on an annular collar 48 of the closing member 41.
  • the inner ring edge 46 and the inner ring region of the sealing disk 42 together form a main valve 50, which is provided with a closing spring 49 acting in the gas flow direction.
  • the outer ring edge 47 is assigned to the sealing lip 44 and forms a snap valve 52 with it.
  • the ring edge 47 is axially offset from the inner ring edge 46 such that in the closed position of the main valve 50, the sealing lip 44 to a small extent from its unstressed initial position downward is turned.
  • the two valves 50, 52 have a control gap 53 in the gas path downstream, which is monitored by a control body 54 formed on the closing member 41 and ensures a linear relationship between the water flow rate and the gas volume supplied to the burner.
  • the closing member 41 When the gas supply is released, the closing member 41 is moved downward, the sealing lip 44 of the snap valve 52 initially remaining in contact with the ring edge 47 fixed to the housing under the influence of the inflow-side gas pressure in the chamber 55. After a certain partial stroke of the closing member 41, the sealing lip 44 tears off from the ring edge 47, as a result of which the small gas or ignition gas quantity corresponding to the partial stroke is suddenly released. When the valve closes, the sealing lip 44 is snapped onto the sealing edge 47 when the parts have approached each other at a certain distance, which is dependent on the gas pressure present.
  • the device according to FIG. 3 consists of a main valve 60 continuously actuated by the mechanical actuator 27, which is followed by a snap valve 62 as an additional valve in the flow path of the gas.
  • the snap valve 62 is provided, analogously to the two previously described embodiments, with a sealing lip 64 clamped on the inner ring edge, which cooperates with a valve seat 65 fixed to the housing on the outflow side of the gas.
  • the sealing lip 64 is fastened to a support body 66 which is slidably mounted in the valve housing and is coupled to a double-armed lever 68 which is rotatably mounted at 67.
  • an actuating rod 70 acts on it, which is firmly connected to a closing member 71 of the main valve 60.
  • the closing member 71 is pressed by a closing spring 72 against the direction of flow of the gas against a valve seat 73 fixed to the housing.
  • the snap valve 62 also keeps the gas path closed until the actuator 27 has opened the upstream main valve 60 to such an extent that a minimum or ignition gas quantity can be exceeded there. Thereafter, the lever 68 presses the support body 66 of the snap valve 62 down so far that the sealing lip 64 tears off the sealing seat 65 and releases the gas supply to the burner.
  • valves are actuated by a thermostat which influences the valves, for example, in accordance with the setpoint deviation of the water outlet temperature of a temperature-controlled gas hot water heater.
  • the snap valve has the function of a two-point controller in a work area in which the heat requirement is below the amount of ignition gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Control Of Combustion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP90103184A 1989-03-29 1990-02-20 Einrichtung zum Steuern der Gaszufuhr zu einem Brenner eines gasbeheizten Gerätes, insbesondere eines Durchlauf-Wassererhitzers Expired - Lifetime EP0389782B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910111A DE3910111C1 (enrdf_load_stackoverflow) 1989-03-29 1989-03-29
DE3910111 1989-03-29

Publications (3)

Publication Number Publication Date
EP0389782A2 EP0389782A2 (de) 1990-10-03
EP0389782A3 EP0389782A3 (de) 1991-05-02
EP0389782B1 true EP0389782B1 (de) 1993-07-07

Family

ID=6377359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103184A Expired - Lifetime EP0389782B1 (de) 1989-03-29 1990-02-20 Einrichtung zum Steuern der Gaszufuhr zu einem Brenner eines gasbeheizten Gerätes, insbesondere eines Durchlauf-Wassererhitzers

Country Status (3)

Country Link
EP (1) EP0389782B1 (enrdf_load_stackoverflow)
DE (2) DE3910111C1 (enrdf_load_stackoverflow)
ES (1) ES2042097T3 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220579A1 (de) * 1992-06-24 1994-01-05 Mertik Regelungstechnik Gmbh Gasmengensteuerung, insbesondere für eine Armatur eines Durchlauf-Wassererhitzers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333775A (en) * 1938-07-08 1943-11-09 Honeywell Regulator Co Control valve
US3229956A (en) * 1962-03-02 1966-01-18 Stevens Mfg Co Inc Diaphragm fluid valve
DE1229928B (de) * 1964-12-23 1966-12-08 Junkers & Co Thermostatisch gesteuertes Gasventil
DE2642483C2 (de) * 1976-09-17 1978-11-02 Joh. Vaillant Kg, 5630 Remscheid Gasventil für eine gasbeheizte Wärmequelle
US4188013A (en) * 1977-08-08 1980-02-12 Honeywell Inc. Gas valve seating member

Also Published As

Publication number Publication date
EP0389782A2 (de) 1990-10-03
EP0389782A3 (de) 1991-05-02
ES2042097T3 (es) 1993-12-01
DE3910111C1 (enrdf_load_stackoverflow) 1990-06-13
DE59001897D1 (de) 1993-08-12

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