US3383042A - Gas-heated continuous-flow heater for hot-water circulation heating - Google Patents

Gas-heated continuous-flow heater for hot-water circulation heating Download PDF

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Publication number
US3383042A
US3383042A US520248A US52024866A US3383042A US 3383042 A US3383042 A US 3383042A US 520248 A US520248 A US 520248A US 52024866 A US52024866 A US 52024866A US 3383042 A US3383042 A US 3383042A
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US
United States
Prior art keywords
valve
gas
switch
water
circuit
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
US520248A
Other languages
English (en)
Inventor
Mobus Gunther
Meier Hans
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.)
Vaillant GmbH
Original Assignee
Joh Vaillant GmbH and Co
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 Joh Vaillant GmbH and Co filed Critical Joh Vaillant GmbH and Co
Application granted granted Critical
Publication of US3383042A publication Critical patent/US3383042A/en
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
    • 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
    • F23N1/085—Regulating fuel supply conjointly with another medium, e.g. boiler water using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/04—Heating water
    • 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
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • 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

Definitions

  • a hot water heating system has a gas heater, a radiator (which might be any type of heat utilization apparatus) and an electric pump to circulate the water thru a water circuit which includes the heater, the radiator and the pump.
  • the gas heater includes a main burner and a pilot light. Through a main gas valve gas is supplied from the mains to both the pilot light and to the main burner.
  • a push rod is provided to open the main gas valve, with the main valve being held open by an electro-magnet provided that the pilot light is burning.
  • a thermo-electric device supplies electricity to the electro-magnet through a circuit which includes a switch controlled by a thermostatic element in the water circuit to open the switch in the event of excess temperature in the water circuit.
  • the safety valve Between the main gas valve and the main burner is a safety valve which is normally urged toward the closed position by a spring.
  • the safety valve is opened by an electro-magnet and a dashpot is connected thereto so as to slow the opening of the safety valve.
  • the electromagnet for the safety valve is connected in a series circuit including four switches. One of these switches is controlled by a flow sensing device in the water circuit to close the switch only when water circulation is occurring.
  • a second switch is controlled by a thermo-responsive element in the water circuit to close the switch only when the water temperature is below a given measurement.
  • the portion of the circuit that includes these two switches and the safety valve electro-magnet are connected in parallel with the water pump for the water circuit.
  • the third switch is the house thermostat switch or the like, and the fourth switch is the main disconnect switch.
  • the push rod to operate the main gas switch has an interlock with the safety valve, operating so that if the safety valve is open, the push rod cannot be moved so as to open the main gas valve.
  • the present invention relates to a gas-heated continuous-fiow heater serving as heat source for a hot-water circulation heating. It is known in such apparatus in connection with a circulating pump to provide a differential pressure switch acting as water-deficiency safety device, controlling a safety valve in the gas path. Commonly, the differential pressure switch with a slow-ignition device acts directly on the safety valve of the gas path. T herefore, a relatively large diaphragm switch is used as differential pressure switch.
  • the ice safety valve is actuated indirectly by an electro-magnetic servo device operating with delay in opening direction, such as a solenoid with hydraulic brake, which device may be switched on by a contact controlled by the differential pressure switch.
  • an electro-magnetic servo device operating with delay in opening direction
  • a solenoid with hydraulic brake which device may be switched on by a contact controlled by the differential pressure switch.
  • a magnet valve with a slow-ignition device such as an oil brake is utilized and is switched on and off by a relatively small and simple differential pressure switch.
  • Such a magnet valve with dynamic differential pressure-controlled contact results in a relatively small unit which may readily be accommodated on the apparatus instead of the large diaphragm switch. Further, additional considerable advantages result by the invention.
  • the magnet valve cannot only be actuated by the dynamic differential pressure, but also by other control elements such as, for instance, a thermostat connected between heat exchanger and heating system or a return flow thermostat, for which purpose an addition magnet valve is otherwise required in the gas path. Above all, upon actuation of the magnet valve by a control element (thermostat) the slowignition device remains active.
  • a valve also may be used which is actuated by an electric servomotor.
  • differential pressure switch a relatively small diaphragm system or a lever switch movable by the water stream or the like may be used.
  • the problem is solved to provide for a control of the gas supply acting with slow-ignition, with circulating pump continuing to operate. Provision may be made that the electric circuit of the servo device having the differential pressure switch contact connected therein and the contact of a control thermostat is parallel to the electric circuit of the circulating pump. Then, by the control thermostat for instance in a connecting pipe between heat exchanger and heating system the gas supply may be cut off and turned on again with slow ignition, without the circulating pump being switched off and on again.
  • thermo-electric pilot safety devices of the type indicated there is provided an auxiliary valve connected with the stern of the main valve and maintaining the gas path closed until the opened main gas valve is retained by the retaining magnet excited by the thermo-electric current.
  • Such an auxiliary valve may however, be dispensed with, if in further modification of the invention the stem of the main gas valve is locked in a manner known per se with an open Waterdeficiency safety valve.
  • thermo-electric pilot safety device there may be provided in a manner known per se a circuit-breaker actuated by a thermostat arranged in the water circulation path. Thereby, at the least expense, all control possibilities are provided required for a continuous-flow heater serving as heat source for a circulation heating.
  • the water circulating in a heating circuit including pipe 1 is fed by means of a pump 2 through a heater 3 and via a line 4 connected between heater and heating system enters into the radiators H of a heating system. After heat emission thereof the water via a return flow line 5 and pump 2 returns to heater 3.
  • a burner 6 is used being controlled by a pilot flame 7'.
  • the pilot flame 7' of pilot burner 7 heats a thermoelement 8 whereby an electromagnet 9 is excited in known manner.
  • electromagnet 9 holds a main gas valve 16 in open position against a spring force 11 and keeps the gas available in dependence on the pilot burner flame for supply of the burner 6.
  • the gas valve By means of a push-button 13 on the gas section 14 for starting the apparatus the gas valve may be opened through a slider 13, whereby pilot gas flows to the pilot burner 7, and the armature plate 12 caused to bear against the magnet 9.
  • the auxiliary valve plate customary in such safetygas sections which interrupts the gas passage to the burner 6 until the armature plate 12 is retained in abutting engagement by the magnet 9, is replaced here by a safety valve 15.
  • the thermo-electric circuit is controlled by a temperaturelimiting device 18 and the electric switch thereof 18'.
  • the temperature-limiting device 18 is incorporated in line 4 in close vicinity to the heat exchanger 3.
  • the safety valve 15 loaded by a spring 15 is controlled by a solenoid 23 via stem 17, which retracts its solenoid core 24 and raises stem 17.
  • Stem 17 has connected therewith a hydraulic brake 25 or dashpot delaying the upstroke.
  • a thermostat 21 closing a contact 21 at a predetermined temperature.
  • a differential pressure switch 22 connected to line 4 closes a contact 22 in dependence on a water flow in line 4.
  • the contacts 21, 22 are connected in series in the electric circuit of solenoid 23 and that part of the circuit is in parallel with the electric circuit of the circulating pump 2.
  • the contact 19 of a main switch and a contact 20 of a room thermostat not shown.
  • the thermo-electric pilot safety device being ready to operate, the electric main switch 19 of a line circuit is closed manually. Provided the room thermostat maintains its contact 20 closed, the pump 2 starts operating.
  • the differential pressure switch 22 closes switch 22'.
  • thermostat 21 When contact 21' is closed solenoid 23 is energized and the magnet core 24 is pulled up and raises lifting pin 17, the oil brake 25 delaying opening of the safety valve 15. Burner 6 now heats the circulating water through heater 3.
  • thermostat 21 When thermostat 21 reaches the adjusted temperature, it opens the circuit of the solenoid 23 via its switch 21, so that the safety valve 15 is closed by its spring 15 and heating is interrupted. However, the pump 2 continues to feed the water to circulate. Only when the thermostat 21 connected between the heat exchanger and the heating system cools off, is switch 21 again closed so that via the flow switch 22, 22' is closed because of water circulation, the solenoid 23 again Opens the safety valve 15 with delay and starts the burner 6.
  • both the pump 2 and the solenoid 23 are switched off. Since there is then no water circulating, the flow switch 22 as additional safeguard interrupts the circuit of the magnet also via switch 22'. As the thermo-electric device 8 remains ready to operate, the apparatus automatically starts operating with closure of the room thermostat contact 2%.
  • the temperaturelimiting device 18 responds and interrupts the thermoelectric circuit as at 18. Then magnet 9 via the armature plate 12 releases the valve plate 10 which is moved into closed position by its spring 11 to shut off the gas. The burner 6 is extinguished.
  • Valve 10 may not be caused to assume its open position until stem 17 has returned into its position of rest. This can only happen, if the electric main switch 19 of the line circuit is being switched off. This also stops the circulating pump 2 and the flow switch in turn opens the electric circuit of solenoid 23 via switch 22 additionally for safety reasons.
  • thermo-electric switch 18 has cooled off again and has again closed its thermo-electric switch 18'.
  • a safety valve connected between the burner and said means and resiliently urged to the closed position; an electro-magnetic servo device including a solenoid and connected to the safety valve to force the valve to the open position upon the energizing of the solenoid; water differential controlled means connected in the water circuit and including an electrical switch which is open when water is not circulating and closed when water is circulating; a series electrical circuit including said switch and said solenoid; and means connected to said valve to slow the opening of the valve in response to said forcing when said solenoid is energized; whereby when water is circulating and said electrical circuit is closed, said safety valve will move slowly to the open position to supply gas to said burner if said gas supply means is supplying gas.
  • thermoresponsive means connected to the water circuit to respond to the water temperature and including second electrical switch which is closed when said water temperature is below a given setting and is open when said water temperature is above said setting, said second switch being in said series electrical circuit.
  • said gas supply means includes a main gas valve and main valve opening means including a thermoelectric safety device connected to the main gas valve to permit the opening of the main gas valve only when the pilot light is burning, said main valve opening means including an interlock operatively associated with said safety valve to prevent said main valve from being moved from the closed to the open position when said safety valve is in the open position.
  • said gas supply means includes temperature responsive means connected to the water circuit to respond to the water temperature and including a pilot electric control device connected to the thermo electric safety device to close the main gas valve with an excessive temperature in said water circuit.
  • said gas supply means includes a main gas valve and main valve opening means including a thermo electric safety device connected to the main gas valve to permit the opening of the main gas valve only when the pilot light is burning, said main valve opening means including an interlock operatively associated with said sa ety valve to prevent said main valve from being moved from the closed to the open position when said salety valve is in the open position.
  • said gas suppiy means includes temperature responsive means connected to the water circuit to respond to the Water temperature and including a pilot electric control device connected to the therrno electric safety devie to close the main gas valve with an excessive temperature in said water circuit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Combustion (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
US520248A 1965-02-13 1966-01-12 Gas-heated continuous-flow heater for hot-water circulation heating Expired - Lifetime US3383042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV27775A DE1274311B (de) 1965-02-13 1965-02-13 Gasbeheizter Durchlauferhitzer fuer Warmwasserumlaufheizungen

Publications (1)

Publication Number Publication Date
US3383042A true US3383042A (en) 1968-05-14

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ID=7583655

Family Applications (1)

Application Number Title Priority Date Filing Date
US520248A Expired - Lifetime US3383042A (en) 1965-02-13 1966-01-12 Gas-heated continuous-flow heater for hot-water circulation heating

Country Status (7)

Country Link
US (1) US3383042A (id)
AT (1) AT280539B (id)
BE (1) BE676167A (id)
CH (1) CH438641A (id)
DE (1) DE1274311B (id)
FR (1) FR1467488A (id)
NL (1) NL148997B (id)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601310A (en) * 1968-11-26 1971-08-24 Vaillant Joh Kg Apparatus for controlling the supply of gas to instant water heaters in circulation heating systems
FR2357823A1 (fr) * 1976-07-08 1978-02-03 Matsushita Electric Ind Co Ltd Installation centrale de conditionnement d'air telecommandee
US4297987A (en) * 1979-05-11 1981-11-03 Amana Refrigeration, Inc. Heat exchange system
US4505253A (en) * 1983-02-04 1985-03-19 Rinnai Kabushiki Kaisha Water heater
US4627416A (en) * 1984-02-27 1986-12-09 Rinnai Kabushiki Kaisha Water heater

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5139856Y2 (id) * 1972-04-20 1976-09-29
DE3012347A1 (de) * 1980-03-29 1981-10-08 Robert Bosch Gmbh, 7000 Stuttgart Durchlauf-wassererhitzer mit einer wassermangelsicherung
FR2560363B1 (fr) * 1984-02-24 1988-08-26 Rinnai Kk Chauffe-eau
CN108644822B (zh) * 2018-05-18 2019-09-13 广东美的厨房电器制造有限公司 燃气设备的控制方法及燃气设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223837A (en) * 1940-12-03 Regulating system
US2583814A (en) * 1947-10-31 1952-01-29 Smith Corp A O Flow controlled water heater
US2848167A (en) * 1953-03-26 1958-08-19 Baso Inc Condition responsive control apparatus
FR1353919A (fr) * 1964-06-08 Vaillant Joh Kg Installation de chauffage central avec chauffe-eau à circulation au gaz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1859361U (de) * 1962-07-28 1962-10-04 Vaillant Joh Kg Gasbeheizter durchlauferhitzer mit elektrischer schaltvorrichtung.
DE1816075A1 (de) * 1968-12-20 1970-06-25 Siemens Ag Gaslaser mit Kuehlmantel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223837A (en) * 1940-12-03 Regulating system
FR1353919A (fr) * 1964-06-08 Vaillant Joh Kg Installation de chauffage central avec chauffe-eau à circulation au gaz
US2583814A (en) * 1947-10-31 1952-01-29 Smith Corp A O Flow controlled water heater
US2848167A (en) * 1953-03-26 1958-08-19 Baso Inc Condition responsive control apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601310A (en) * 1968-11-26 1971-08-24 Vaillant Joh Kg Apparatus for controlling the supply of gas to instant water heaters in circulation heating systems
FR2357823A1 (fr) * 1976-07-08 1978-02-03 Matsushita Electric Ind Co Ltd Installation centrale de conditionnement d'air telecommandee
US4297987A (en) * 1979-05-11 1981-11-03 Amana Refrigeration, Inc. Heat exchange system
US4505253A (en) * 1983-02-04 1985-03-19 Rinnai Kabushiki Kaisha Water heater
US4627416A (en) * 1984-02-27 1986-12-09 Rinnai Kabushiki Kaisha Water heater

Also Published As

Publication number Publication date
NL6517196A (id) 1966-08-15
NL148997B (nl) 1976-03-15
BE676167A (id) 1966-06-16
AT280539B (de) 1970-04-10
FR1467488A (fr) 1967-01-27
DE1274311B (de) 1968-08-01
CH438641A (de) 1967-06-30

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