EP2176595A2 - Brûleur à gaz - Google Patents

Brûleur à gaz

Info

Publication number
EP2176595A2
EP2176595A2 EP08775068A EP08775068A EP2176595A2 EP 2176595 A2 EP2176595 A2 EP 2176595A2 EP 08775068 A EP08775068 A EP 08775068A EP 08775068 A EP08775068 A EP 08775068A EP 2176595 A2 EP2176595 A2 EP 2176595A2
Authority
EP
European Patent Office
Prior art keywords
temperature
measuring point
gas burner
pot
burner
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
EP08775068A
Other languages
German (de)
English (en)
Other versions
EP2176595B1 (fr
Inventor
Christophe Cadeau
Emmanuel Mastio
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to EP08775068.3A priority Critical patent/EP2176595B1/fr
Publication of EP2176595A2 publication Critical patent/EP2176595A2/fr
Application granted granted Critical
Publication of EP2176595B1 publication Critical patent/EP2176595B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges

Definitions

  • one goal is to be able to measure a temperature in a cooker heated by a gas burner.
  • the temperature information may be displayed to a user and used to operate an automatic temperature control typically associated with a gas control valve.
  • an automatic temperature control typically associated with a gas control valve.
  • the gas cooker with the widest possible breadth of foods (eg oil, water, butter, eggs, sugar, etc.) and cookware (eg pans, aluminum pots, stainless steel pots, cast iron) should be used - Nine pots, copper plugs, etc.) can work together.
  • a temperature sensor is arranged in the region of the gas burner and touches the bottom of the pot or the pan.
  • the main difficulty with this construction is the temperature of the pot inside the
  • the temperature measurement is influenced among other things by a heat radiation from the flame, by hot gases and by a heat conduction in the gas burner.
  • the temperature of the burner after a few minutes of operation is higher than the pot temperature, and the sensor measures the burner temperature higher than the pot temperature. In most cases, therefore, the measured temperature is above the actual food temperature in the pot, and this offset in temperature increases as the gas burner warms up. Therefore, in conventional gas hobs, the detection of the pot or food temperature for satisfactory and reproducible cooking results is not sufficient.
  • EP 1 258 683 A1 show a gas stove with the above-mentioned written construction.
  • EP 1 258 683 A1 discloses a shielding means for the temperature sensor.
  • the gas burner has a first temperature sensor arranged therein with a first temperature measuring point or sensor element, wherein the temperature sensor is set up to touch a cookware placed on the gas burner. Furthermore, the gas burner has at least one second temperature measuring point in or on the gas burner, which is more thermally insulated from the cookware than the first temperature measuring point. The influence of the cookware on the temperature measurement is thus stronger at the first temperature measuring point than at the second temperature measuring point. Temperature measuring point and sensor element can usually be used synonymously. By providing the second temperature measuring point, the influence of a burner environment (hot gases, heat radiation and conduction) on a temperature measurement on the pot can be compensated. This allows, among other things, an accurate pot temperature control, a precise food temperature display and additional safety functions to be implemented.
  • temperatures are detected both at the first temperature measuring point and at the second temperature measuring point, which are composed of a heat proportion of the cookware and a heat portion of the burner, but in different proportions.
  • the second temperature measuring point or the second sensor element positioned and thus to a greater extent thermally insulated from the cookware than the first temperature measuring point that at the second temperature measuring point substantially only a heat influence of the burner is measured, which moreover preferably resembles the heat influence of the burner at the first temperature measuring point. This simplifies the compensation.
  • the protective cover is concave-shaped on its outside, at least in sections, since hot gases can be conducted past the protective cover in a particularly effective manner.
  • the protective cover may for example be made of brass or a ceramic, z. For example, alumina exist.
  • the first temperature sensor is arranged on a thermally insulating carrier, preferably below the measuring point of the second temperature sensor.
  • the thermally insulating support is made of stainless steel.
  • z. As well as a carrier of high temperature ceramic conceivable, for. B. of alumina or silicon carbide.
  • the degree of thermal insulation desired for compensation depends, among other things, on the structure and the desired measurement accuracy.
  • stainless steel in a burner environment is considered to be sufficiently warm-insulating for most cases with its thermal conductivity in the range of 15 W m "1 K " 1 .
  • the measuring point of the second temperature sensor may be located on the protective cover, especially on an inner side facing the temperature sensor. This has the advantage that a heat influence by the gas burner is very similar to the point at the first temperature measuring point, but there is no direct contact with the pot and thus the influence of the pot is negligible. Also, the protective cover does not need to be made of warm insulating material. Rather, it may even be desired to provide a good thermal conductivity.
  • the method is used to determine a temperature of a cookware heated by means of the above gas burner, comprising the following steps: measuring a first temperature value at the first temperature measuring point and a second temperature value at the second temperature measuring point; Determining the difference between the two temperature values; and multiplying the difference by a proportionality factor.
  • the proportionality factor is determined empirically.
  • the proportionality factor is preferably selected depending on the type of cookware.
  • FIG. 2 shows a sketch-like cross-sectional illustration in side view of a conventional gas burner with a contacting temperature sensor
  • 3 shows a cross-sectional representation in side view of a contacting temperature sensor
  • T 1 shows a plot of a temperature T in 0 C over the time t in s a measured temperature Tl (an assumed pot temperature) and an actual pot temperature or food temperature Tf. Since in this example in the pot boiling water is reached, the Pot temperature Tf after some time 100 0 C and remains there. However, the temperature T 1 measured by a temperature sensor connected thermally conductively to the pot is continuously higher than the temperature
  • This temperature offset is referred to as To.
  • the temperature offset To is due to the fact that the temperature sensor not only measures the pot temperature, but is also influenced by the burner or the burner environment, since the burner also transfers heat to the sensor.
  • the temperature sensor 4 has a strong heat-conductive contact part 4a, z. B. made of copper, an insulating support 4b, z. B. stainless steel, and the actual sensor element, for. B. a PtRh element, on, the measuring point 4c is located between the contact part 4a and 4b Trager.
  • FIG 3 shows a cross-sectional view in side view of a gas burner 5 with a basic structure as shown in FIG 2, and in addition with a surrounding the temperature sensor 4 laterally surrounding protective cover 6 in the form of a concave on its outer circumference designed sleeve, z. B. brass or stainless steel.
  • the protective cover 6 serves, in particular, to protect the temperature sensor 4 from hot gases G and the heat radiation S and to produce a more constant measuring environment at the temperature sensor 4. Due to the concave outer contour, in particular the hot gases G can be effectively bypassed.
  • the gas burner 5 also has a second measuring point 7 for detecting a burner ambient temperature T2.
  • the second measuring point 7 which corresponds to the position of a measuring head of a second temperature sensor, is more strongly insulated from the bottom of the pan 3 than the first measuring point 4c.
  • the second measuring point 7 in FIG. 3 on the carrier 4b is further away from the bottom of the pot 3 than the first measuring point 4c. Consequently, the effect of the pot bottom 3 is taken into account less in a measurement of T2 than in a measurement of T1.
  • the second measuring point 7 is substantially positioned so that the Influence of the pot bottom on the measurement of T2 is possible as far as possible and yet the influence of the burner environment due to the flame generation corresponds approximately to the influence at the first measuring point 4c.
  • the stainless steel carrier 4b is a poor conductor of heat compared to the contact part 4a
  • the influence of the pan bottom 3 at the second measuring point 7 is comparatively small, while the influence of the flames F (burner environment), e.g. B. by hot gases G, heat radiation S and heat conduction through the carrier 4b at both measuring points 4c, 7 is similar.
  • the second measuring point 4c thus serves as a compensation measuring point for the influence of the burner environment.
  • the second or a further temperature measuring point 8 can be located on the protective cover 6, preferably on an inner side of the protective cover, in particular on the end opposite to the bottom of the pot 3.
  • a measured burner ambient temperature T2 is also plotted at the second measuring point 7 or 8.
  • the temperature offset To is proportional to the difference between the measured pot temperature Tl and the measured burner ambient temperature T2.
  • the temperature offset To can thus be described as:
  • the value of the proportionality factor a is most easily determined experimentally. For example, the value when using a brass protective stucco 6 is about -0.3.
  • the factor a depends on various parameters, including the type of cookware, the type of food and the type of gas.
  • an accuracy of the determined / calculated loading food temperature or let pot temperature of 0 +/- 10 C in terms have the actual food temperature Tf reached even taking into account different types of cookware and food types. If the factor a is determined depending on the type of pot, an accuracy of +/- 3 ° C can even be achieved. Therefore, a very accurate temperature detection is possible on the pot, which in turn makes it possible to build a reliable temperature control, which is sufficiently accurate even near a boiling point of a liquid in the pot. The accuracy is long-term stable, there is no significant dependence on the initial conditions.
  • the pot / food temperature can be displayed to a user with high accuracy, which is particularly useful for determining a frying and frying temperature.
  • the present invention is not limited to the embodiments shown.
  • the second measuring point may also be provided at another suitable location, for. B. in the middle of the protective cover or further down the carrier.
  • a person skilled in the art will be able, after reading the claims and possibly with the aid of the above description and the accompanying drawings, to arrange the temperature measuring points even with differently configured gas burners according to the invention in order to compensate an influence of the burner environment on the measurement of a pot temperature within the scope of a desired measuring accuracy to be able to.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Control Of Combustion (AREA)

Abstract

La présente invention concerne un brûleur à gaz dans lequel se trouve un premier capteur de température qui présente un premier point de mesure de température ou un premier élément de détection. Ledit capteur de température est conçu pour entrer en contact avec un ustensile de cuisine placé sur le brûleur à gaz. Le brûleur à gaz présente également au moins un second point de mesure de température qui est mieux isolé thermiquement de l'ustensile de cuisine que le premier point de mesure de température.
EP08775068.3A 2007-07-30 2008-07-15 Brûleur à gaz Not-in-force EP2176595B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08775068.3A EP2176595B1 (fr) 2007-07-30 2008-07-15 Brûleur à gaz

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07360036 2007-07-30
PCT/EP2008/059208 WO2009016027A2 (fr) 2007-07-30 2008-07-15 Brûleur à gaz
EP08775068.3A EP2176595B1 (fr) 2007-07-30 2008-07-15 Brûleur à gaz

Publications (2)

Publication Number Publication Date
EP2176595A2 true EP2176595A2 (fr) 2010-04-21
EP2176595B1 EP2176595B1 (fr) 2014-09-10

Family

ID=39924934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08775068.3A Not-in-force EP2176595B1 (fr) 2007-07-30 2008-07-15 Brûleur à gaz

Country Status (4)

Country Link
EP (1) EP2176595B1 (fr)
CN (1) CN101765745B (fr)
ES (1) ES2507563T3 (fr)
WO (1) WO2009016027A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116772243A (zh) * 2018-09-18 2023-09-19 佛山市顺德区美的洗涤电器制造有限公司 温度传感器及燃气灶

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492336A (en) * 1982-03-17 1985-01-08 Matsushita Electric Industrial Co., Ltd. Cooker with heating control system
DE3912124C1 (fr) * 1989-04-13 1990-07-12 Schott Glaswerke, 6500 Mainz, De
JP2848015B2 (ja) * 1991-05-17 1999-01-20 松下電器産業株式会社 調理器
JPH1068508A (ja) * 1996-06-25 1998-03-10 Tong Yang Magic Corp ガス調理器用赤外線ガスバーナー
JP3801746B2 (ja) * 1997-09-22 2006-07-26 リンナイ株式会社 鍋底温度センサ及びそれを使用したガスこんろ
JP3691462B2 (ja) * 2002-07-30 2005-09-07 リンナイ株式会社 コンロ用鍋底温度センサ
DE20317712U1 (de) * 2003-11-14 2004-02-19 Weisser Gmbh & Co. Kg Gasbeheizter Grill
JP2006138597A (ja) * 2004-11-15 2006-06-01 Paloma Ind Ltd ガスコンロ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009016027A3 *

Also Published As

Publication number Publication date
CN101765745A (zh) 2010-06-30
WO2009016027A2 (fr) 2009-02-05
WO2009016027A3 (fr) 2009-09-17
EP2176595B1 (fr) 2014-09-10
CN101765745B (zh) 2012-09-05
ES2507563T3 (es) 2014-10-15

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