Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
  • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
  • F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/26—Details
  • F23N5/265—Details using electronic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2231/00—Fail safe
  • F23N2231/20—Warning devices
  • F23N2231/22—Warning devices using warning lamps

Definitions

• Gas-heated water heater especially instantaneous water heater
• the invention is based on a gas-heated
• Water heater in particular water heater, according to the preamble of the main claim.
• a viewing opening on the housing in order to be able to observe the ignition process or the combustion process on the basis of the flame formation.
• the gas-heated water heater according to the invention is characterized in that the aforementioned viewing window can be dispensed with by using an electrical operating display for flame detection.
• an electrical operating display can be implemented with simple means, while the introduction of a viewing window into the housing jacket of the water heater and into the front of the combustion chamber wall means considerably more manufacturing effort.
• a viewing window for flame detection By dispensing with a viewing window for flame detection, a closed and attractive design can be selected for the device jacket of the water heater that is similar to that of electrical devices.
• the measures listed in the subclaims further advantageous embodiments of the water heater according to the main claim are possible.
• the water heater has an ionization flame monitoring system known per se, the operating display according to the invention for flame detection being switched as a function of the ionization current signal.
• the electrical operating indicator lights up, e.g. an LED display, green on, so that the user is informed that the gas-heated water heater is operating correctly.
• the electrical operating display for flame detection is advantageously integrated in a module that, in addition to the operating display, includes a charge status display for batteries which are responsible for the power supply and an on and off switch for the power supply.
• the flap has a viewing window, behind which the operating display and the charge status display for the batteries are still arranged visibly despite the closed flap.
• FIG. 1 schematically shows the casing of a gas-heated water heater with an operating display for flame detection
• FIG. 2 shows a device diagram of a water heater with the functionally relevant components.
• a housing jacket 10 of a gas flow heater is shown, in which a control panel 12 is provided in the lower region.
• the control panel cover 12 has a gas slide 14, with which the gas supply to a burner 16 can be opened or closed.
• a water quantity selector 18 in the form of a rotary knob is arranged below the gas slide valve 14.
• Charge status indicator 22 for batteries and an on and off switch 24 for the power supply are provided, the batteries arranged in a battery box 26 serving for the power supply.
• the three elements 20, 22, 24 are arranged behind an operating flap 28, with a window 29, even in the closed state, leaving the view of the electrical operating display 20 for flame detection and the electrical charge status display 22 open for the batteries.
• the device has a water flow line 30, which leads from a water inlet 32 via a water fitting provided as a whole with the reference number 34 and a heat exchanger 36 to a hot water outlet 38 or to a dispensing valve.
• the gas burner 16 which is supplied with fuel gas from a gas line 40, is arranged below the heat exchanger 36 in a combustion shaft (not shown).
• a gas fitting provided as a whole with the reference number 42 is arranged in the gas line 40.
• the gas fitting 42 has a gas valve 44 which is connected to an ignition burner 48 via an ignition gas tube 46.
• a membrane 50 is also arranged in the gas valve 42 and, in cooperation with a second gas valve 52 of the gas valve 42, controls a first main gas valve 54 arranged in the gas line 40.
• a bypass line 56 which bypasses the membrane 50 and leads to the second gas valve 52, is also arranged on the gas fitting 42.
• a second main gas valve 58 is arranged in the gas line 40 and releases the gas path depending on the position of the gas slide 14.
• a control valve 60 arranged in the gas line 40 and connected to the water fitting 34 in proportion to The flow rate of the water and the amount of gas passed to the burner 16.
• the outlet temperature of the water can be changed via the rotary knob 18 accessible from the outside.
• An ignition electrode 62 and a flame monitoring electrode 64 are also arranged on the pilot burner 48.
• the gas-heated water heater has a control unit 66 which is connected to the electrical components, including for its own voltage supply, to the battery box 26 via corresponding control or supply lines.
• the operating display for flame detection works in the following way:
• the operational readiness of the gas-heated water heater is established in that the control unit 66 is supplied with voltage via the slide switch 24.
• a microswitch 68 arranged on the water fitting 34 is closed and a voltage signal is sent to the control unit 66.
• Control unit 66 opens the first gas valve 44 in the gas fitting 42, which is closed when de-energized.
• the first main gas valve 54 is closed while the gas valve 52 is open, so that gas from the gas line 40 passes through the bypass line 56 into the pilot gas pipe 46 and flows to the pilot burner 48, where it is ignited with the aid of the ignition electrode 62.
• the ionization flame monitoring electrode 64 reports the ignition to the control device 66, which now closes the gas valve 52.
• the gas in the pilot gas tube 46 burns out, as a result of which the pressure in the right-hand chamber half of the gas fitting 42 drops.
• the differential pressure arising across the diaphragm 50 opens the first main gas valve 54. If the user has previously opened the second main gas valve 58 with the aid of the gas slide 14, the gas path is via
• the electrical operating display 20 is activated at the same time, which lights up green during the entire process of drawing off hot water, and thus signals to the user that the water heater is operating correctly.
• the voltage signal to the control unit 66 is interrupted via the microswitch 68.
• the first gas valve 44 is closed and the second gas valve 52 is opened.
• the differential pressure on the membrane 50 is reduced and the first main gas valve 54 is closed.
• the flame on the burner 16 extinguishes, as a result of which a signal for switching off the electrical operating display 20 is simultaneously sent to the control unit 66 via the monitoring electrode 64.
• the second main gas valve 58 which can be actuated via the gas slide 14, can be dispensed with, since the first main gas valve 54 can be electrically controlled via the on / off switch 24, and thus the required safety function takes over.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Control Of Combustion (AREA)
• Feeding And Controlling Fuel (AREA)
• Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7870004

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Citations (7)

• 1998
  • 1998-06-05 DE DE19825138A patent/DE19825138A1/de not_active Withdrawn
• 1999
  • 1999-05-06 WO PCT/DE1999/001359 patent/WO1999064790A1/de active IP Right Grant
  • 1999-05-06 ES ES99932635T patent/ES2209463T3/es not_active Expired - Lifetime
  • 1999-05-06 DE DE59907113T patent/DE59907113D1/de not_active Expired - Lifetime
  • 1999-05-06 PT PT99932635T patent/PT1027559E/pt unknown
  • 1999-05-06 EP EP99932635A patent/EP1027559B1/de not_active Expired - Lifetime

Patent Citations (7)

Non-Patent Citations (5)

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