WO2015049600A1

WO2015049600A1 - Gas cooking point, a hob arrangement and method for operating a gas cooking point

Info

Publication number: WO2015049600A1
Application number: PCT/IB2014/064331
Authority: WO
Inventors: Sergio Llorente Gil; Emilio Placer Maruri; Julio Rivera Peman
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2013-10-02
Filing date: 2014-09-09
Publication date: 2015-04-09
Also published as: ES2533143A1

Abstract

The invention relates to a gas cooking point (1) comprising at least one IF sensor (6) for the contactless detection of the temperature of cookware (30) associated with the gas cooking point (1).

Description

Gas hob, hob assembly and method of operating a gas hob

The present invention relates to a gas hob and a hob arrangement with at least one gas hob. Furthermore, the present invention relates to a method for operating a gas hob.

Modern household appliances are subject to strict safety regulations. In particular, effective measures for fire prevention in relation to cooking, especially gas hobs are required. Among other things, a gas cooker fire can be prevented by always keeping the temperature of a food container or pot associated with the gas cooker below a threshold value of 250.degree. This requires permanent monitoring of the temperature of the food container. In conventional gas hobs, the temperature of the food container is monitored by means of a sensor which is coupled to a spring. To determine the temperature of the

Gargutbehälters the spring presses the sensor against the food container, preferably the bottom of the Gargutbehälters, and detects the temperature of the direct thermal contact. The sensor thus determines the temperature of the food container. The sensor and the spring not only affect the aesthetic image of the gas hob, but also represent another, sometimes difficult to clean component of the gas hob. However, the user is desired gas hobs that reliably the temperature of a

Gargutbehälters determine and at the same time have a harmonious appearance, especially in hob arrangements, and are easy to clean.

Against this background, an object of the present invention is to provide an improved gas hob, an improved cooktop assembly having at least one gas hob, and an improved method of operating a gas hob.

Accordingly, a gas hob is proposed which has at least one infrared sensor for non-contact determination of a temperature of the gas hob associated Gargutbehälters. An infrared sensor detects temperatures based on thermal radiation in the form of infrared radiation. When heating a Gargutbehälters this is heated and emits heat radiation. The heat radiation of the food container radiates into the room. An infrared sensor receives the heat radiation, whereby the temperature of the

Gargutbehälters can be determined. Infrared sensors are small, compact components that can be easily integrated into gas hobs. Due to the heat radiation no contact between the infrared sensor and the food container is required. As a result, the infrared sensor can be arranged at almost any point in the gas hob. According to one embodiment, the infrared sensor is adapted to detect radiated heat radiation from the underside of a food container. This is particularly advantageous since the cooking product container is generally heated from below and thus the underside of the food container thus forms the warmest region of the food container. In this way a reliable temperature determination is ensured.

According to a further embodiment, the gas hob comprises a gas burner, wherein the infrared sensor is arranged in a region around the gas burner. For example, the infrared sensor in the cooktop plate, in which the gas burner is used, be arranged. This has the advantage that the infrared sensor at

Maintenance or repair is easily accessible.

According to a further embodiment, the gas cooker has a gas burner, and the infrared sensor is arranged in a region in or on the gas burner. Such an arrangement is particularly favorable because the infrared sensor is not exposed in this way so much to the resulting when using the Gargutbehälters impurities (splashes of liquid food or solid food ingredients). In this way, a long life of the infrared sensor and thus a long-term reliable temperature determination is ensured. According to a further embodiment, the gas burner also has a

Burner cap on, and the infrared sensor is located below the burner cover. In this case, the burner cap is at least partially formed of an infrared-transparent material. In this arrangement, the radiated from the food container Heat radiation through the infrared-transparent material of the burner cover through and hit the infrared sensor. In this case, the infrared sensor can be arranged directly under the part of the burner cover formed from infrared-transmitting material. But it is also conceivable, the infrared sensor adjacent to the

Infrared-permeable material formed part of the burner cover below the same. An arrangement below the burner cover, the infrared sensor is even more effectively protected from contamination. In addition, the infrared sensor remains invisible to the user by being located inside the gas burner and the visual appearance is improved. According to a further embodiment, the burner cap is at least partially formed of glass ceramic. The glass ceramic used is, in particular, a material permeable to infrared radiation. At the same time, glass ceramic is easy to clean and contributes to a harmonious appearance of the gas hob due to its flat, smooth surface structure. Examples of glass ceramics are silicon dioxide, aluminum oxide, magnesium oxide, titanium oxide, zinc oxide or zirconium oxide.

According to a further embodiment, the gas burner has a burner cap, and the infrared sensor pierces the burner cap. Such an arrangement of the infrared sensor ensures that it is always located directly below the bottom of the food container, which ensures a reliable temperature measurement. At the same time, the infrared sensor is easily accessible during maintenance and repair work. According to a further embodiment, the gas cooking point to the

Infrared sensor coupled optical fiber for transmitting the radiated from the food container heat radiation to the infrared sensor. The heat radiation receiving end of the light guide can be arranged at any point around the gas burner around or on or in the gas burner, while the other end of the light guide is coupled to the infrared sensor. As a result, an even more flexible arrangement of the infrared sensor can be ensured. For example, by means of the light guide a large distance between the gas hob and the infrared sensor can be bridged, so that the infrared sensor spaced from the Gas cooker can be arranged. This may be necessary if the installation space of the gas hob does not allow an arrangement of the infrared sensor directly on or in the gas hob. Likewise, however, a small distance between the gas hob and the infrared sensor can also be bridged by means of the light guide, so that the infrared sensor can be arranged near or directly in or on the gas hob.

According to a further embodiment, the optical waveguide comprises polymeric optical fibers or glass fibers. These types of fibers have proven to be favorable for the conduction of light waves.

Furthermore, a hob arrangement with at least one gas hob is proposed as described above. Such a hob arrangement allows monitoring of one or more gas hobs. In addition, a cooktop arrangement with several gas burners and an infrared sensor is also proposed. The thermal radiation of different food containers, which are associated with the gas burners are transmitted, for example by means of signal conductors to the infrared sensor. It may be fiber optic signal conductors capable of transmitting infrared signal. Such an arrangement has the advantage that only a single sensor is sufficient to monitor several gas hobs. This allows a reliable and low-maintenance monitoring system.

According to a further embodiment, the at least one infrared sensor generates sensor signals which are transmitted to a control module.

According to a further embodiment, the control module controls a heating power of the gas hob in dependence on a temperature determined by the infrared sensor. For example, in the case of multiple infrared sensors, the control module may control the heating power of each individual gas hob, such as reducing or completely stopping (reducing to zero) when a particular temperature of a food storage container is detected. In particular, the control module controls only the heating power of those

Gas hob, which has heated a food storage container associated with it to over 250 ° C, while the heat output of the other gas hobs remains unchanged. For example, in the case of a single infrared sensor, the control module simultaneously controls the heat output of all gas hobs. Occasionally reduced or terminated (reduced to zero, switch off) the control module, the heating capacity of all gas hobs as soon as the temperature of a single food storage container has reached the threshold of 250 ° C.

Furthermore, a method for operating at least one gas hob

proposed. The method comprises the following steps:

Heating a cooking container associated with the gas hob,

Contactless determination of a temperature of the Gargutbehälters using at least one infrared sensor, wherein the infrared sensor is adapted to, from the

To detect the underside of a Gargutbehälters radiated heat radiation and

To generate sensor signals,

Transmitting the sensor signals to a control module, and

Controlling a heating power of the gas hob in dependence on one of the

Infrared sensor detected temperature.

As a result, a reliable method for operating at least one gas hob is provided, which is a targeted monitoring of the temperature in the region of

Gas hob and especially on a Gargutbehälterunterseite allows.

The embodiments and features described for the proposed device apply accordingly to the proposed method. Further possible implementations of the invention also include not explicitly mentioned combinations of before or below with respect to the

Embodiments described features or embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the embodiments of the described below Invention. Furthermore, the invention will be explained in more detail by means of preferred embodiments with reference to the attached figures.

Fig. 1 shows a perspective view of a detail of a first embodiment of a gas cooking point;

Fig. 2 shows a cross-sectional view of a second embodiment of a gas cooking station; and

3 shows a plan view of a hob arrangement according to the invention.

In the figures, the same or functionally identical elements have been given the same reference numerals, unless stated otherwise.

1 shows a perspective view of a section of a first embodiment of a gas hob 1. The gas hob 1 has a gas burner 2 for generating gas flames. The gas burner 2 has a burner neck 3 for supplying gas and a burner cap 4 for guiding the gas to an edge of the gas burner 2 with gas outflow openings 5. In Fig. 1, only the protruding from a hob plate 11 part of the burner neck 3 is shown. This part of the burner neck 3 is substantially sleeve-shaped. In a lower region, the protruding from the cooktop plate 1 1 part of the burner neck 3 has a vertically extending from the cooktop plate 1 1 ring, followed by a ring with conically converging cross section at its upper edge. The ring of conically converging cross-section has a plurality of circumferentially disposed gas outflow openings 5, which allow the gas flowing through the burner neck 3 to flow out of the gas. The burner cover 4 is circular disk-shaped and arranged horizontally on the burner neck 3. Alternatively, the burner cap 4 may also be formed as a disc in another form, such as in elliptical, quadrangular or polygonal shape.

Around the gas burner 2 are an infrared sensor 6 for determining a temperature of a cooking utensil (not shown) arranged on the gas hob 1

Heat sensor 7 for detecting a gas flame and an ignition device 8 for Igniting the gas emerging from the Gasausströmöffnungen 5 arranged in a circular arc. The infrared sensor 6 detects heat radiation IR, which is radiated, for example, from a hot pot bottom. The heat sensor 7 is heated by a burner flame during operation of the gas hob 1 and the gas burner 2. if the

Burner flame goes out, the heat sensor 7 generates a signal that leads to a closure of the corresponding gas valve for the burner 2. With the help of the ignition device 5 gas flowing from the Gasausströmöffnungen be ignited.

For example, a spark is generated by means of the ignition device 8.

In the illustrated embodiment, the infrared sensor 6, the heat sensor 7 and the igniter 8 are arranged on the cooktop panel surrounding the burner neck 3 so as to extend vertically upwardly from the cooktop panel in an imaginary circular path. The infrared sensor 6, the heat sensor 7 and the ignition device 8 pierced at openings 15, the hob plate 1 1 and are connected to the bottom side with control and signal lines to other facilities of each gas range or gas hob.

FIG. 2 shows a cross-sectional view of a second embodiment of the gas hob 1. The gas hob 1 shown in FIG. 2 has the same as that shown in FIG

Gas hob 1 a gas burner 2, which has a burner neck 3 and a burner cap 4 arranged horizontally above the burner neck 3. The burner neck 3 has a mixing chamber 9 extending horizontally in the burner neck 3 for mixing gas and primary air. At the outer edge of the mixing chamber 9 extend in the vertical direction more Gasausströmkanäle 10, which open into horizontally arranged Gasausströmöffnungen 5. Due to the sectional view in Fig. 2, only two Gasausströmkanäle 10 and Gasausströmöffnungen 5 are shown. In fact, however, the mixing chamber 9 has several arranged along its outer edge

Gas Ausströmkanäle 10 and 5 Gasausströmöffnungen. The burner neck 3 is inserted into a horizontally extending hob plate 11, so that it protrudes from this in the vertical direction.

In the mixing chamber 9 of the burner neck 3, an infrared sensor 6 for determining a temperature of a arranged on the gas hob 1 Gargutbehälters 30 is arranged. The infrared sensor 6 extends vertically in the mixing chamber 9 of the burner neck 3. In other words, the infrared sensor 6 is directed to the underside of the burner cap 4. In this case, the infrared sensor 6 is arranged almost centrally under the burner cover 4. Alternatively, however, the infrared sensor 6 can also be arranged at any other position inside the burner neck 3, for example at an outer edge of the mixing chamber 9, in the radial direction of the mixing chamber 9 before or after

Gas exhaust ducts 10. In the case of an arrangement of the infrared sensor 6 on or in the gas burner 2, the burner cover 4 should at least partially from a

be formed infrared permeable material. In this case, the region formed from an infotranslucent material is preferably arranged directly above the infrared sensor 6, but may also be arranged at any other position in the burner cover 4. At a position to the left of the gas burner 2 in Fig. 2, a heat sensor 7 for detecting a gas flame is shown. The heat sensor 7 pierces the hob plate 11 and extends from the hob plate 11 vertically upwards.

Above the burner cover 4 of the food container 30 is arranged. The food storage container 30 has a cooking product lower part 31 and a food container cover 32. The

Gargutbehälterunterteil 31 is cup-shaped. On the upper open edge of the Gargutbehälterunterteils 31 sits flush with the Gargutbehälterdeckel 32. The Gargutbehälter 30 is held by several Topfträgerfingern 22 above the gas burner 2. The pot carrier fingers 22 extend in such a horizontal direction that the

Gargutbehälter 30 at least partially rests on the top of the pot carrier fingers 22. Due to the sectional view in Fig. 2, only two pot carrier fingers 22 are shown.

In fact, however, the food container 30 is located on a plurality of, that is three or more, pot carrier fingers 22. 3 shows a top view of an embodiment of a hob arrangement 100. The hob arrangement 100 has five gas cooking stations 1, 1A, 1B, 1C, 1D. Each of the four outer gas hobs 1, 1A, 1 B, 1 C has a gas burner 2, 2A, 2B, 2C, 2D with a burner cap 4. The burner caps 4 are each circular, but differ in their diameters. To each gas burner 2, 2A, 2B, 2C, 2D, a pot carrier 20 is arranged. The pot carrier 20 each has a in

Substantially square pot carrier frame 21, on which eight pot carrier fingers 22 are provided, four long pot carrier fingers 22 and four short pot carrier fingers 22. The four long pot carrier fingers 22 each extend in a 90 ° -Wnkel each other from the Pot carrier frame 21 toward the burner cover 4. The four short pot carrier fingers 22 are arranged near the corners of the pot carrier frame 21 parallel to the extending in the orientation of FIG. 3 in a left-right direction long pot carrier fingers 22. The gas hob 1 D is arranged in the hob arrangement 100 of each two gas hobs 1, 1A, 1 B, 1 C left and right framed. The gas hob 1 D is equipped with a dual burner 2D, which can realize several flame rings.

Two burner caps 4D, 4E are used. The inner burner cap 4D is designed in the manner of a circular disk, and the second outer burner cap 4E is arranged as a ring around the inner burner cap 4D. From the annular burner cap 4E, a flame crown may be generated inwardly toward the inner burner cap 4D and outward. The more flames are formed, the higher the heat output of the gas hob 1 D. The gas hob 1 D has a pot carrier 20. The pot carrier 20 has in each case a substantially rectangular pot carrier frame 21, on which eight pot carrier fingers 22 are provided, four long pot carrier fingers 22 and four short pot carrier fingers 22, like the

Pot carrier fingers 22 of the gas cooking stations 1, 1A, 1 B, 10 are arranged.

Each gas hob 1, 1A, 1B, 10, 1D is an infrared sensor 6, 6A, 6B, 60, 6D

assigned. The gas cooking stations 1, 1A, 1B, 10 have an infrared sensor 6, 6A, 6B, 60 arranged around the gas burner 2, and the central gas hob 1D has an infrared sensor 6D arranged in the dual burner 2D. The infrared sensor 6D associated with the central hotplate 1D is in the outer annular one

Burner cover 4E provided. Each infrared sensor 6, 6A, 6B, 60, 6D is provided with a signal conductor 12, 12A, 12B, 120, 12D for transmitting sensor signals. The signal conductor 12 extends in each case from the infrared sensor 6, 6A, 6B, 60, 6D to a control module 13. The control module 13 is set up in particular depending on the respective sensor signal of an infrared sensor 6, 6A, 6B, 60, 6D, the heating power of those Gas hob or gas cooking stations l, 1A, 1 B, 10, 1 D to control their assigned gas well 30 a temperature above a predetermined

Threshold temperature has reached, for example, 250 ° C. In this case, the control module can either reduce the heating power or even completely stop, that is to reduce to zero. The infrared sensors 6, 6A, 6B, 60, 6D have, for example, a Detection direction in each case towards a potentially above the

Gas cooker is directed to the pot carrier set food containers. Therefore, the radiated example of the respective bottom of the pot heat can be detected as infrared radiation. With the help of the control module 13, the temperature is then determined and evaluated.

Further, the hob assembly 100 with five control knobs 14 for manual

Setting the heating power of a respective gas hob 1, 1A, 1 B, 1 C, 1 D provided. In each case, a control knob 14 of a gas hob 1, 1A, 1 B, 1 C, 1 D assigned. The control knob 14 are formed as a rotary knob.

During operation of the hob arrangement 100, one or more gas hobs 1, 1A, 1 B, 1 C, 1 D are started by actuating the or those control knob 14. More specifically, by turning a certain control knob 14, a desired heating power of a particular gas hob 1, 1A, 1 B, 1 C, 1 D can be set.

As soon as the control knob 14 is turned, heating gas flows into the gas burner 2 of the corresponding gas hob 1, 1A, 1 B, 1 C, 1 D. The heating gas flows out of a

Heating gas reservoir (not shown) through the burner neck 3 in the mixing chamber 9, where it mixes with primary air, which also flows through one or more openings (not shown) in the mixing chamber 9. The gas-air mixture then flows through the Gasausströmkanäle 10 to the gas outflow openings 5, through which it out of the

Torch neck 3 exits. By means of the burner cover 4 arranged horizontally above the burner neck 3, the gas-air mixture is led horizontally to the outside of the gas burner 2. If the gas-air mixture reaches the outer edge of the gas burner 2, it is ignited by the ignition device 8 arranged there and forms a flame rim along the circumference of the burner cover 4. In the case of the gas hob 1 D, three flame rings are formed along the circumferences in certain operating situations the respective burner cap 4D, 4E.

By the flame ring of the above the gas burner 2 arranged on the pot carrier 20 Gargutbehälter 30 is heated. As a result, the cooking product container 30, in particular the bottom of the cooking product lower part 31, emits heat radiation in the form of infrared radiation. For example, the heat radiation strikes the infrared sensor 6 arranged around the gas burner 2. Alternatively, the heat radiation penetrates the Area of the burner cover 4E, which is formed of an infrared-transparent material, and impinges on the under the burner cover 4E, that is arranged in the burner neck 3 infrared sensor 6D. This is the case with the central dual burner 2D. The infrared sensor 6D converts the temperature of the food storage container 30 into an electrical sensor signal which reaches the control module 13 via the signal conductor 12. As soon as the food container 30 has reached a temperature threshold value of 250 ° C., the control module 13 reduces or terminates or switches off the heating power of the corresponding gas hob 1, 1A, 1 B, 1 C, 1 D. Thus, a fire hazard is effectively prevented by overheated pots or pans as Gargutbehälter. Although the present invention has been described with reference to embodiments, it is variously modifiable.

Used reference signs:

1, 1A, 1 B, 1C, 1 D gas hob

2 gas burners

3 burner neck

4, 4D, 4E burner cap

5 gas outlet

6, 6A, 6B, 6C, 6D infrared sensor

7 heat sensors

8 ignition device

9 mixing chamber

10 gas discharge channel

11 hob plate

12, 12A, 12B, 12C, 12D signal conductors

13 control module

14 control knob

15 opening

20 pot carrier

21 pot carrier frame

22 pot carrier fingers

30 food containers Gargutbehälterunterteil Gargutbehälterdeckel hob arrangement heat radiation

Claims

1. Gas cooking point (1) with at least one infrared sensor (6) for contactless determination of a temperature of the gas hob (1) associated Gargutbehälters (30).

2. Gas hob (1) according to claim 1, characterized in that the

Infrared sensor (6) is adapted to detect radiated from the bottom of a Gargutbehälters (30) heat radiation (IR).

3. Gas cooking station (1) according to claim 1 or 2, further comprising a gas burner (2), wherein the infrared sensor (6) is arranged in a region around the gas burner (2) around.

4. Gas cooking station (1) according to claim 1 or 2, further comprising a gas burner (2), wherein the infrared sensor (6) in a region in or on the gas burner (2) is arranged.

5. gas hob (1) according to claim 4, characterized in that the

Gas burner (2) has a burner cover (4) and the infrared sensor (6) below the burner cover (4) is arranged, wherein the burner cover (4) is at least partially formed of an infrared-transparent material.

6. gas hob (1) according to claim 5, characterized in that the

Burner cover (4) is at least partially formed of glass ceramic.

7. gas hob (1) according to claim 4, characterized in that the

Gas burner (2) has a burner cap (4) and the infrared sensor (6) the

Burner cover (4) pierces.

8. Gas cooking station (1) according to any one of claims 1-7, further comprising a to the infrared sensor (6) coupled light guide for transmitting heat radiation (IR), which is radiated from the food container (30) to the infrared sensor (6).

9. gas hob (1) according to claim 8, characterized in that the light guide comprises polymeric optical fibers or glass fibers.

10. hob arrangement (100) with at least one gas hob (1) according to one of claims 1 to 9.

11. hob arrangement (100) with a plurality of gas burners (2) and an infrared sensor (6), wherein the infrared sensor (6) heat radiation (IR) of different food containers (30) associated with the gas burners (2) are transmitted by means of light guides.

12. hob arrangement (100) according to claim 10 or 11, characterized in that the at least one infrared sensor (6) generates sensor signals to a

Control module (13) are transmitted.

13. Hob arrangement (100) according to claim 12, characterized in that the control module (13) controls a heating power of the gas cooking point (1) in response to a temperature determined by the infrared sensor (6).

14. A method for operating at least one gas hob (1), comprising:

Heating a gas cooker (30) associated with the gas hob (1), determining contactlessly a temperature of the food container (30) by means of at least one infrared sensor (6), wherein the infrared sensor (6) is adapted to radiate from the underside of a food container (30) Detect thermal radiation (IR) and generate sensor signals,

Transmitting the sensor signals to a control module (13), and

Controlling a heating power of the gas hob (1) in dependence on a with

Help of the infrared sensor (6) determined temperature of the food container (30).