EP0172198A1 - Rechauffeurs a gaz et leur regulation - Google Patents

Rechauffeurs a gaz et leur regulation

Info

Publication number
EP0172198A1
EP0172198A1 EP85900957A EP85900957A EP0172198A1 EP 0172198 A1 EP0172198 A1 EP 0172198A1 EP 85900957 A EP85900957 A EP 85900957A EP 85900957 A EP85900957 A EP 85900957A EP 0172198 A1 EP0172198 A1 EP 0172198A1
Authority
EP
European Patent Office
Prior art keywords
signal
valve
temperature
sequencing
armature
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.)
Withdrawn
Application number
EP85900957A
Other languages
German (de)
English (en)
Inventor
John Massey Trihey
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.)
Vulcan Australia Ltd
Original Assignee
Vulcan Australia Ltd
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 Vulcan Australia Ltd filed Critical Vulcan Australia Ltd
Publication of EP0172198A1 publication Critical patent/EP0172198A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/10—Sequential burner running
    • 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

Definitions

  • the invention also provides a solenoid valve comprising a body, a movable armature, a coil which when activated moves the shaft in the first direction, a valve seat, a valve element movable with the armature to sealingly engage or disengage the valve seat in accordance with the position of the armature, and position limiting means for limiting movement of the shaft in said first direction, said limiting means comprising elastomeric material.
  • the invention also relates to a gas fired apparatus having a gas burner, a gas supply line,.an electrically operated valve in the gas supply line, and a controlled circuit for controlling the solenoid valve, said circuit including a selectable reference temperature generator, a temperature sensing element, means for generating a difference signal between the output of the reference temperature generator and the temperature sensing element, sequencing means for producing a time variable sequencing signal, a comparator for comparing the difference signal to the periodically variable sequencing signal, the output of the comparator comprising a control signal which is coupled to control the valve the arrangement being such that the duty cycle during each period of the sequencing signal is dependent upon the difference in temperature between the reference temperature and the temperature sensed by said temperature sensitive element.
  • FIGURE 1 is a schematic cross-sectional view through a flueless gas heater
  • FIGURE 2 is a schematic view of the heater with the front louvres removed
  • FIGURE 3 shows a solenoid valve of the invention?
  • FIGURE 4 shows a modified form of solenoid valve of the invention;
  • FIGURE 5 shows a control arrangement utilizing two solenoid valves;
  • FIGURE 6 shows diagrams of energy inputs as a function of time for the control arrangement shown in Figure 5;
  • FIGURE 7 is a schematic arrangement of a modified form of control arrangement;
  • FIGURE 8 shows diagrams of energy input as a function for the control arrangement of Figure 7;
  • FIGURE 9 illustrates diagrammatically a controlled circuit for use in the apparatus of the invention.
  • the heater shown in Figure 1 comprises a housing 2 having a base 4, rear wall 6, front louvres 8 and top louvres 10.
  • a heat exchanger 11 which is preferably formed from stainless steel or other heat resistant material.
  • a burner 12 which in use produces two rows of flames 14 heat the inner surfaces of the heat exchanger 11.
  • the front face of the exchanger is provided with a plurality of openings 16 to provide inlet air for the burner 12, as indicated by arrows
  • FIG 3 shows a solenoid valve 30 constructed in accordance with the invention and particularly useful for controlling the supply of gas to the burner 12 in the heater shown in Figures 1 and 2.
  • the solenoid valve comprises a lower body 32, an upper body 34 and coil 36.
  • the lower body is formed with inlet and outlet ports 38 and 40.
  • the inlet port 38 communicates with a lower chamber 42 which is in communication with an upper chamber 44 formed in the upper body 34.
  • the valve includes an armature shaft 46 which is mounted for reciprocal movement in a tubular guide member 47 mounted in the upper body 34 and extending into the coil 36.
  • a resilient valve element 48 is mounted on the lower end of the armature shaft 46 and in use sealingly engages a valve seat 50 formed in the body 32 and communicating with the outlet port 40.
  • the elastomeric abutment member 52 limits the upward movement of the armature and because of its elastomeric properties cushions the deceleration of the armature, thus resulting in very silent operation of the relay valve.
  • the effective duty cycle for the waveform 64 is much lower than that for waveform 62. Because of the relatively high frequency of operation of the solenoid enables, the control to resemble the sort of control which is normally only available with a fully modulated gas regulator which of course is much more complex than the arrangement illustrated in Figure 3. Further, the thermostatic sensor can be arranged to have a low temperature differential, i.e. the difference between the temperatures at which the solenoid opens and closes.
  • Figure 5 illustrates the use of the bypass solenoid valve 65 in series with the on-off solenoid valve 30.
  • Figure 6 shows typical waveforms for the energy input to the burner as a function of time.
  • the waveform 68 gas flow as a function of time
  • the level of gas flow at the closure, of solenoid valve 65 is determined by the size of the bypass passage 66.
  • the solenoid valve 65 is controlled so as to alter its effective duty cycle to thereby produce the required average gas input to the heater.
  • the valve 30 would only be closed if there is a power failure, over temperature, physical tipover of the heater, flashback retention or by operation of the on-off switch by the user.
  • bypass solenoid valves it would be possible of course to arrange for several bypass solenoid valves to be provided in series each having a different size bypass passage so that the resultant combination would more closely resemble a fully modulated regulating valve.
  • the waveform 104 is shown as decreasing slowly with time, but, of course, it could remain constant.
  • Figure 10B shows an output waveform 111 of the comparator 107 in the instance where the differential amplifier 102 has an output waveform 103.
  • the voltage is continuously high and the solenoid will be continually open. It would be possible to arrange that the waveform 103 always coincides with the peaks of the sawtooth waveform 108 so that the solenoid would close briefly at the end of each period of the sawtooth waveform.
  • Figure IOC shows an output waveform 112 of the comparator when the input from the differential amplifier is like waveform 104.
  • the waveform 112 is high when the magnitude of the waveform 104 exceeds the magnitude of the waveform 108, thereby producing a pulsed output the duration of the pulses being related to the difference between the temperature sensed by the thermistor 101 to the reference temperature generated by the reference generator 100.
  • the waveform 104 decreases with time and the pulses in waveform 112 vary in width. If waveform 104 were constant the widths of the pulses in waveform 112 would be the same.
  • Figure 10D shows a waveform 113 which is produced when the output of the differential amplifier 102 has a waveform 105.
  • the waveform 113 is continuously low and thus the solenoid valve 30 will remain closed continuously.
  • the difference between T max and T min can be made low say for instance of the order of 2°C thereby avoiding undesirably large variations in the temperature to be controlled.
  • This is more desirable from the user's point of view and moreover avoids large temperature variations in the heating apparatus which would be present with other forms of thermostatic control where there is a large difference between temperatures corresponding to T max and T min. This avoids problems caused by repetitive thermal expansions and contractions.
  • the thermistors are very accurate and therefore the temperature control is very accurate in accordance with the invention.
  • the temperature of the heat exchanger may vary, for example between 245°C and 250°C when the solenoid is closed and open. This may produce a variation in temperature from say 68°C to 70°C in the air heated by the heat exchanger.
  • the heat exchanger would normally be permitted to cool to ambient during off periods and may rise to as high as say 500°C during on periods thereby greatly increasing problems due to thermal expansions and contractions.
  • the period T of the sawtooth waveform is about three minutes. However this period can be made very much shorter in which case the solenoid will be operated more frequently and the energy output of the apparatus will be more analogous to an apparatus having a fully modulated gas control. If' the period T of the sawtooth waveform were made of very short duration it is possible that the armature shaft 46 of the solenoid valve 30 will assume an equilibrium position as determined by the duty cycle of the voltage waveform applied to the coils 36 (tending to open the valve) and the biasing force of the spring 54 (which tends to close the valve) . In this way a more or less conventional solenoid valve can be made to operate in a manner analogous to a modulating valve. It will be appreciated however that the construction of the valve shown in Figure 3 or 4 is very much simpler than a conventional modulating valve. Many modifications will be apparent to those skilled in the art without departing from the spirit and scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

Appareil chauffé au gaz comportant une soupape à solénoïde qui est régulée par un circuit régulé produisant un signal de régulation (111, 112, 113) dont le coefficient d'utilisation dépend de la différence entre une température détectée par un thermistor et une référence sélectionnable (100). L'appareil peut comporter un réchauffeur d'air chauffé au gaz conçu à des fins domestiques.
EP85900957A 1984-02-22 1985-02-22 Rechauffeurs a gaz et leur regulation Withdrawn EP0172198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU3749/84 1984-02-22
AU374984 1984-02-22

Publications (1)

Publication Number Publication Date
EP0172198A1 true EP0172198A1 (fr) 1986-02-26

Family

ID=3694214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900957A Withdrawn EP0172198A1 (fr) 1984-02-22 1985-02-22 Rechauffeurs a gaz et leur regulation

Country Status (2)

Country Link
EP (1) EP0172198A1 (fr)
WO (1) WO1985003761A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595446B1 (fr) * 1986-03-06 1989-02-03 Chaffoteaux Et Maury Nouveau procede de controle et de modulation du debit de gaz permettant aux chauffe-eau instantanes a gaz du type sans veilleuse permanente et sans pile, de fonctionner en puissance variable proportionnelle au debit d'eau ou avec regulation thermostatique
US4835976A (en) * 1988-03-14 1989-06-06 Eaton Corporation Controlling superheat in a refrigeration system
DE3829677C2 (de) * 1988-09-01 1997-12-11 Lve Verfahrenselektronik Gmbh Verfahren und Anordnung zur Regelung von pulssteuerbaren Brennern in einer wärmetechnischen Anlage
EP0379759B1 (fr) * 1989-01-26 1995-04-05 Ranco Japan Limited Vanne à commande proportionnelle
CN103453560B (zh) * 2012-05-28 2018-07-10 博西华电器（江苏）有限公司 燃气灶及其燃气流量控制装置和方法
EP3450848B1 (fr) * 2017-09-01 2021-01-06 Technische Universität Berlin Procédé pour commander un appareil de combustion et un dispositif de commande

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1588212A1 (de) * 1967-10-27 1970-12-10 Intec Ind Technik Robert R Sch Verfahren zur Regelung eines Tastverhaeltnisses
IT1121760B (it) * 1978-06-20 1986-04-23 Plessey Handel Investment Ag Perfezionamenti in o relativi a sistemi per il controllo di caldaie
US4373663A (en) * 1981-12-10 1983-02-15 Honeywell Inc. Condition control system for efficient transfer of energy to and from a working fluid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8503761A1 *

Also Published As

Publication number Publication date
WO1985003761A1 (fr) 1985-08-29

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TRIHEY, JOHN, MASSEY