Heating plate adopting thermocouple to measure temperature

Abstract

The utility model relates to a heating plate adopting a thermocouple to measure temperature, which comprises a metal heating plate and a main control circuit, a heating mechanism is arranged on the lower side of the metal heating plate, the lower side of the metal heating plate is further connected with the thermocouple, and the main control circuit is respectively and electrically connected with the heating mechanism and the thermocouple. A welding structure is formed at the connecting position of the thermocouple and the metal heating plate through high-temperature metal welding, the vertical projection of the heating mechanism and the vertical projection of the welding structure are staggered, and the welding structure is formed through high-temperature metal welding, so that the high-temperature resistance is high, the thermocouple can work normally for a long time in a high-temperature environment, and the service life of the thermocouple is prolonged. In addition, the installation position of the thermocouple is flexible, the thermocouple can be better installed at the position, corresponding to the position staggered with the heating mechanism, of the metal heating plate according to needs, and the phenomenon that the temperature measurement precision of the thermocouple on the metal heating plate is affected by heating of the heating mechanism is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a heating plate which adopts a thermocouple to measure temperature. Background Art

[0002] Existing electric grills usually use electric heating tubes to heat metal plates. In order to reduce the volume and energy consumption of the electric grill, electric grills using thick films as heating elements have appeared on the market.

[0003] The patent document with publication number CN219697915U discloses "a thick film heating plate with low equivalent inductance", the specific contents of which include "the NTC temperature sensing component is arranged at one end of the bottom insulating layer close to the silver electrode, and the two ends of the NTC temperature sensing component are respectively connected to the two silver electrodes in the middle part through a conductive film" (see paragraph

[0005] of the description of the comparative document for details).

[0004] NTC temperature sensing components are usually installed on the insulating layer and electrically connected to the electrodes through a conductive film. The electrodes need to be connected to external wires by soldering. However, the distance between the NTC temperature sensing component and the heating film is relatively close, and the high-temperature working environment can easily cause the solder position to loosen. Moreover, the position of the electrode is set close to the periphery of the insulating layer, which makes it impossible for the NTC temperature sensing component to be installed at a position relatively far away from the periphery of the insulating layer.

[0005] Therefore, further improvements are needed. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and to provide a heating plate that uses thermocouples to measure temperature. The thermocouples can work normally for a long time in a high-temperature use environment, and the installation position of the thermocouples is more flexible. The temperature can be measured at a suitable position on the metal heating plate, and the influence of the heating mechanism on the temperature measurement accuracy of the thermocouples is reduced.

[0007] The purpose of the utility model is achieved in this way:

[0008] A heating plate using thermocouple temperature measurement includes a metal heating plate and a main control circuit. A heating mechanism is provided on the lower side of the metal heating plate. A thermocouple is also connected to the lower side of the metal heating plate. The main control circuit is electrically connected to the heating mechanism and the thermocouple respectively. The connection position of the thermocouple and the metal heating plate forms a welding structure through high-temperature metal welding. The vertical projection of the heating mechanism is staggered with the vertical projection of the welding structure.

[0009] As a specific solution, the thermocouple includes a temperature measuring body and a conductive wire. One end of the temperature measuring body is welded to a metal heating plate by high-temperature metal welding to form a welding structure. The other end of the temperature measuring body is electrically connected and fixed to the conductive wire. The thermocouple is electrically connected to the main control circuit through the conductive wire.

[0010] As a specific solution, the metal heating plate is made of metal, and the thermocouple and the metal heating plate are welded by laser welding or metal welding to form a welding structure.

[0011] As a specific solution, several groups of heating mechanisms are provided on the lower side of the metal heating plate. Different heating mechanisms are electrically connected to the main control circuit and can work independently of each other. The position of each group of heating mechanisms on the metal heating plate forms a corresponding cooking zone.

[0012] As a specific solution, a plurality of thermocouples are provided on the lower side of the metal heating plate, and at least one thermocouple is distributed in different cooking zones. The thermocouples in different cooking zones are electrically connected to the main control circuit respectively.

[0013] As a specific solution, the heating mechanism includes a plurality of heating blocks, which are distributed longitudinally to form heating groups, and the heating blocks on adjacent heating groups are staggered laterally.

[0014] As a specific solution, the heating mechanism is a thick film heating element.

[0015] As a specific solution, an insulating layer is provided between the metal heating plate and the heating mechanism, the heating mechanism is connected and fixed to the insulating layer, and the insulating layer is tightly connected to the metal heating plate by sintering or bonding with insulating slurry or by die-casting or stamping.

[0016] As a specific solution, the vertical projection of the insulating layer is staggered from the vertical projection of the welding structure.

[0017] The beneficial effects of the utility model are:

[0018] Since the welding structure is formed by high-temperature metal welding, it has strong high temperature resistance, which allows the thermocouple to work normally for a long time in a high temperature environment and prevents the thermocouple from accidentally falling off the metal heating plate. Moreover, the installation position of the thermocouple is relatively flexible and can be better installed on the metal heating plate at a position corresponding to the staggered position of the heating mechanism according to needs, thereby preventing the heating of the heating mechanism itself from affecting the temperature measurement accuracy of the thermocouple on the metal heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the first embodiment of the utility model.

[0020] Figure 2 It is a schematic structural diagram of the first embodiment of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] First embodiment:

[0023] See also Figure 1 , Figure 2 The heating plate using thermocouple temperature measurement comprises a metal heating plate 1 and a main control circuit 2. A heating mechanism 3 is arranged on the lower side of the metal heating plate 1. A thermocouple 4 is also connected to the lower side of the metal heating plate 1. The main control circuit 2 is electrically connected to the heating mechanism 3 and the thermocouple 4 respectively. The connection position of the thermocouple 4 and the metal heating plate 1 forms a welding structure by high-temperature metal welding. The vertical projection of the heating mechanism 3 is staggered from the vertical projection of the welding structure. Since the welding structure is formed by high-temperature metal welding, it has strong high temperature resistance, which can make the thermocouple 4 work normally for a long time in a high temperature environment, and avoid the thermocouple 4 accidentally falling off the metal heating plate 1. Moreover, the installation position of the thermocouple 4 is relatively flexible, and can be better installed on the metal heating plate 1 at a position corresponding to the staggered position of the heating mechanism 3 according to the needs, so as to avoid the heating of the heating mechanism 3 itself affecting the temperature measurement accuracy of the thermocouple 4 on the metal heating plate 1.

[0024] Furthermore, the thermocouple 4 includes a temperature measuring body 41 and a conductive wire 42. One end of the temperature measuring body 41 is welded to the metal heating plate 1 by high-temperature metal welding to form a welding structure. The other end of the temperature measuring body 41 is electrically connected and fixed to the conductive wire 42. The thermocouple 4 is electrically connected to the main control circuit 2 through the conductive wire 42.

[0025] Furthermore, the metal heating plate 1 is made of metal, and the thermocouple 4 and the metal heating plate 1 form a welding structure through laser welding or metal welding, which further improves the welding stability between the metal heating plate 1 and the thermocouple 4. The laser welding process is mature and the welding efficiency is high.

[0026] Furthermore, a plurality of groups of heating mechanisms 3 are provided on the lower side of the metal heating plate 1. Different heating mechanisms 3 are electrically connected to the main control circuit 2 respectively and can work independently of each other. The position corresponding to each group of heating mechanisms 3 on the metal heating plate 1 forms a corresponding cooking zone 11. By setting a plurality of groups of heating mechanisms 3, a plurality of cooking zones 11 can be formed on the metal heating plate 1. By controlling the power of different heating mechanisms 3, different functions of the cooking zones 11 can be realized. For example, different cooking zones 11 can be used for quick frying, keeping warm, etc.

[0027] Furthermore, a plurality of thermocouples 4 are provided on the lower side of the metal heating plate 1 , and at least one thermocouple 4 is distributed in different cooking zones 11 . The thermocouples 4 in different cooking zones 11 are electrically connected to the main control circuit 2 , respectively, to further improve the temperature measurement accuracy of different cooking zones 11 .

[0028] Furthermore, the heating mechanism 3 includes a plurality of heating blocks, which are distributed longitudinally to form heating groups, and the heating blocks on adjacent heating groups are staggered laterally, such as Figure 2As shown, a single heating group can be formed by four heating blocks distributed in series along the longitudinal direction, and the heating blocks at the same lateral position on adjacent heating groups are staggered with each other, that is, the heating blocks at the same lateral position are distributed in a plum blossom-bamboo shape, which can further improve the overall heating uniformity of the metal heating plate 1.

[0029] Furthermore, the heating mechanism 3 is a thick film heating element.

[0030] Furthermore, an insulating layer 5 is provided between the metal heating plate 1 and the heating mechanism 3, and the heating mechanism 3 is connected and fixed to the insulating layer 5. The insulating layer 5 is tightly connected to the metal heating plate 1 by sintering or bonding an insulating slurry. The insulating layer 5 can be glass or resin, which can protect the rear film heating unit and facilitate the printing of the heating mechanism 3 on the insulating layer 5. After printing, the heating mechanism 3 and the insulating layer 5 can be installed and connected to the metal heating plate 1 as a whole.

[0031] Furthermore, the vertical projection of the insulating layer 5 is staggered from the vertical projection of the welding structure, so as to avoid the insulating layer 5 affecting the direct contact between the thermocouple 4 and the metal heating plate 1 , thereby improving the temperature measurement accuracy of the thermocouple 4 .

[0032] Second embodiment:

[0033] The difference between this embodiment and the first embodiment is that the insulating layer 5 of the heating plate using thermocouple temperature measurement is tightly connected to the metal heating plate 1 by die-casting.

[0034] The remaining undescribed parts are the same as those of the first embodiment and will not be repeated here.

[0035] Third embodiment:

[0036] The difference between this embodiment and the first embodiment is that the insulating layer 5 of the heating plate using thermocouple temperature measurement is tightly connected to the metal heating plate 1 by stamping.

[0037] The above embodiments are only preferred embodiments of the present invention, and the present invention may have other embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all within the scope set by the claims of this application.

Claims

1. A heating plate using thermocouple temperature measurement, comprising a metal heating plate (1) and a main control circuit (2), wherein a heating mechanism (3) is provided on the lower side of the metal heating plate (1), characterized in that: The lower side of the metal heating plate (1) is also connected to a thermocouple (4), the main control circuit (2) is electrically connected to the heating mechanism (3) and the thermocouple (4) respectively, the connection position of the thermocouple (4) and the metal heating plate (1) forms a welded structure by high-temperature metal welding, and the vertical projection of the heating mechanism (3) is staggered from the vertical projection of the welded structure.

2. The heating plate using thermocouple temperature measurement according to claim 1, characterized in that: The thermocouple (4) comprises a temperature measuring body (41) and a conductive wire (42); one end of the temperature measuring body (41) is welded to the metal heating plate (1) by high-temperature metal welding to form a welding structure; the other end of the temperature measuring body (41) is electrically connected and fixed to the conductive wire (42); and the thermocouple (4) is electrically connected to the main control circuit (2) via the conductive wire (42).

3. The heating plate using thermocouple temperature measurement according to claim 1, characterized in that: The metal heating plate (1) is made of metal, and the thermocouple (4) and the metal heating plate (1) are welded by laser welding or metal welding to form a welding structure.

4. The heating plate using thermocouple temperature measurement according to claim 1, characterized in that: A plurality of groups of heating mechanisms (3) are provided on the lower side of the metal heating plate (1); different heating mechanisms (3) are electrically connected to the main control circuit (2) and can work independently of each other; a corresponding cooking zone (11) is formed at a position on the metal heating plate (1) corresponding to each group of heating mechanisms (3).

5. The heating plate using thermocouple temperature measurement according to claim 4, characterized in that: A plurality of thermocouples (4) are provided on the lower side of the metal heating plate (1), at least one thermocouple (4) is distributed in different cooking zones (11), and the thermocouples (4) in different cooking zones (11) are respectively electrically connected to the main control circuit (2).

6. The heating plate using thermocouple temperature measurement according to claim 1, characterized in that: The heating mechanism (3) comprises a plurality of heating blocks, which are distributed longitudinally to form a heating group, and the heating blocks on adjacent heating groups are staggered in the transverse direction.

7. The heating plate using thermocouple temperature measurement according to any one of claims 1 to 6, characterized in that: The heating mechanism (3) is a thick film heating element.

8. The heating plate using thermocouple temperature measurement according to claim 7, characterized in that: An insulating layer (5) is provided between the metal heating plate (1) and the heating mechanism (3); the heating mechanism (3) is connected and fixed to the insulating layer (5); and the insulating layer (5) is tightly connected to the metal heating plate (1) by means of sintering or bonding with insulating slurry or die-casting or stamping.

9. The heating plate using thermocouple temperature measurement according to claim 8, characterized in that: The vertical projection of the insulating layer (5) is offset from the vertical projection of the welding structure.

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