CN200944670Y - Thick film high power electric heating element temperature control device - Google Patents

Abstract

The utility model relates to a high-power electrical heating components and parts temperature control device of thick film. The utility model provides an adopt the thick film high-power electrical heating components and parts that two different positive temperature coefficient thick liquids and the thick liquids of different side resistances constitute main heating body and vice heating member alone for provide the protection in the aspect of the control by temperature change to thick film high-power electrical heating components and parts. The utility model discloses contain the base member that useful stainless steel made, cover the internal electric insulation layer on one of them main surface of base member, set up the main heating body orbit and the auxiliary heating body orbit of different orbit figures above the internal electric insulation layer, cover outer electric insulation layer above the orbit figure of main heating body and auxiliary heating body, main heating body and auxiliary heating body pass through the wire and switch on temperature control circuit board. The utility model relates to a thick film type high-power electric heating component for a water boiling container, which protects the thick film type high-power electric heating component, such as a household kettle and a water heater, and has other wide applications.

Description

Thick film high power electric heating element temperature control device

technical field

The utility model relates to an electric heating element, in particular to a temperature control device for a thick film type high-power electric heating element.

Background technique

There are some problems in the temperature control of the existing thick-film high-power electric heating elements. For example, if the water heating container using the thick-film electric heating element is placed on an inclined surface, when the container is dried out, the temperature of the heating element will be reduced by one liter. The high part will overheat and self-destruct by being exposed first; if the thick film heating element in a kettle or water heater is operated on an inclined When any part is exposed above the water surface in the appliance, the element will be damaged by localized overheating. It was also proposed to prevent heating elements from tilting and parallel multi-resistance NTC (negative temperature coefficient resistance) tracks to control, using bimetallic strips and connecting the tracks of heating elements in parallel to the main heating part and multiple sensor parts, Connect multiple NTC (Negative Temperature Coefficient Resistor) tracks in series, and add a bimetal temperature control device to control them. This multi-resistance NTC track will bring production costs and difficulties in production, and these are inseparable from the use of Bimetal temperature control strips are used to sense temperature, not to mention the correctness and slowness of bimetal strip sensing temperature, but also other temperature control devices are added to configure bimetal strips. The high price makes people discouraged, which leads to thick Membrane high-power electric heating components are expensive and troublesome to produce.

Utility model content

Aiming at the problems existing in the prior art, the technical problem to be solved by the utility model is to provide a thick film that uses two different positive temperature coefficient slurries and slurries with different square resistances to form the main heating body and the auxiliary heating body separately. High-power electric heating components are used to provide protection for thick-film high-power electric heating components, so as to achieve the purpose of controlling the main heating part.

For reaching above-mentioned purpose, the utility model is realized through following technical scheme:

A thick-film high-power electric heating element temperature control device, including a substrate made of stainless steel, one of the main surfaces of the substrate is covered with an inner electrical insulating layer, and the main heating body track with different track patterns is set on the inner electrical insulating layer and the track of the auxiliary heating body, the outer electrical insulation layer is covered on the track pattern of the main heating body and the auxiliary heating body, and the main heating body and the auxiliary heating body are connected to the temperature control circuit board through wires.

Further, the track end of the auxiliary heating body is provided with an auxiliary terminal protruding from the outer electrical insulating layer, and the end of the track of the main heating body is provided with a main terminal protruding from the outer electrical insulating layer, and the main terminal and the auxiliary terminal are connected through a wire Temperature control circuit board.

The above-mentioned main heating body and auxiliary heating body are composed of at least two kinds of different temperature coefficient slurries, and are composed of two kinds of PTC characteristic slurries with different temperature coefficients.

The utility model utilizes two main heating bodies and auxiliary heating bodies with different trajectory patterns (see Figure 1), and divides thick-film high-power electric heating elements into two separate parts, the main heating body and the auxiliary heating body. The temperature coefficient thermistor material (referred to as PTC) is a slurry. Two different PTC positive temperature coefficient slurries and slurries with different square resistances are used to form the main heating body and the auxiliary heating body separately. The main heating body requires large Power, and the power is stable, the main heating element is composed of slurry with small square resistance and small PTC (positive temperature coefficient) characteristics; the auxiliary heating element is not mainly used for heating, but mainly used for convenient temperature control and temperature adjustment. Therefore, PTC (Positive Temperature Coefficient) slurry with large square resistance, low power and large temperature coefficient is used. Then control the temperature of the auxiliary heating body through the temperature control circuit board. When the auxiliary heating body reaches the required temperature, the power supply of the main heating body is cut off, so as to achieve the purpose of controlling the main heating body. The temperature of the main heating body is adjusted by adjusting the temperature of the auxiliary heating body, so as to provide protection for the thick-film high-power electric heating components. The present invention relates to a thick-film high-power electric heating element for boiling water vessels, such as household kettles and water heaters, and has other wide applications.

Description of drawings

Fig. 1 is the schematic diagram of implementing the base part of the utility model.

Fig. 2 is a structural schematic diagram of the utility model implementation.

Fig. 3 is a graph showing the temperature coefficients of the main heating body and the auxiliary heating body of the utility model.

Fig. 4 is the electronic circuit diagram of the temperature control circuit board implemented in the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

The relevant structure of the utility model mainly includes the following components (or devices): auxiliary heating body 1, inner electrical insulating layer 2, main heating body 3, outer electrical insulating layer 4, main terminal 5, temperature control circuit board 6, wire 7, auxiliary Terminal 8, substrate 9.

The utility model comprises a base body 9 made of stainless steel, on one of the main surfaces of the base body 9, an inner electrical insulating layer 2 made of glass ceramics is formed, and a main heating body 3 and a main heating body are formed on the inner electrical insulating layer 2. Secondary heating body 1 two kinds of different track patterns (referring to Fig. 1), on the main heating body 3 and the track pattern of secondary heating body 1 also cover an outer electrical insulation layer 4 made of microtransistor glass for example. The track end of the secondary heating body 1 is provided with a secondary terminal 8 protruding from the outer electrical insulating layer 4, and the track end of the main heating body 3 is provided with a main terminal 5 protruding from the outer electrical insulating layer 4. The main terminal 5 and the secondary terminal 8 pass The wire 7 conducts the temperature control circuit board 6; the temperature control circuit board 6 controls the temperature of the 1st part of the auxiliary heating body, and when the 1st part of the auxiliary heating body reaches the required temperature, the power supply of the 3rd part of the main heating body is cut off , so as to achieve the purpose of controlling the 3 parts of the main heating body, and adjust the temperature of the 3 parts of the main heating body by adjusting the temperature of the 1 part of the auxiliary heating body.

The present invention is composed of two kinds of slurries with different square resistances, and the final resistances of the two are different on the thick-film high-power heating element, and constitute the main heating body 3 and the auxiliary heating body 1. The final resistance change of part 1 of auxiliary heating body is greater than that of part 3 of main heating body, and its temperature coefficient is greater than that of part 3 of main heating body (see Figure 3). It can be seen from the slope of the resistance temperature curve in Figure 3 . It can be seen from Figure 3 that the resistance of the main heating body 3 and the auxiliary heating body 1 part of the two temperature coefficients all increase with the increase of temperature, and the resistance value of the auxiliary heating body 1 part increases significantly. It is larger than the 3 parts of the main heating body, that is, Δr ₁ > ΔR ₁ , Δr ₂ > ΔR ₂ , and the main purpose of setting the 1 part of the auxiliary heating body is because its resistance is large, and the resistance changes greatly, which is easy to control and adjust.

The temperature control circuit board 6 is connected to the auxiliary terminal 8 of the auxiliary heating body 1 and the main terminal 5 of the main heating body 3. The temperature control circuit board 6 is provided with two adjustable resistors CR1 and CR2. Responding to the relay J2 that changes part of the auxiliary heating body 1, the temperature control circuit board 6 is provided with a relay T1 (see FIG. 4 ) that is used to control part of the power supply of the main heating body 3 track. For example: through the two adjustable resistors CR1 and CR2 on the temperature control circuit board 6, when their inductive resistance is adjusted to _r2 , the temperature control circuit board 6 is powered, since the resistance of the auxiliary heating body 1 is r at the beginning ₁ , r ₁ < r ₂ , so the line control device on the temperature control circuit board 6 supplies power to the auxiliary heater 1 and the main heater 3, and the circuit control device on the temperature control circuit board 6 supplies power to the main heater 3 and the auxiliary heater 1 power supply, so that it generates heat, and the temperature rises slowly, so that the resistance of the main heating body 3 and the auxiliary heating body 1 gradually increases, when the resistance of the auxiliary heating body 1 reaches the sensing resistance set on the line control device When r _{is 2} , the line control device immediately senses this resistance and generates a low-level output to the auxiliary heater 1 and the main heater 3. At this time, the corresponding temperatures of the main heater 3 and the auxiliary heater 1 are both T1, so that the thick The temperature of the film heating element is controlled at T1, so that the temperature control circuit board 6 senses the resistance of the auxiliary heating body 1 so as to cut off the power supply of the track part of the main heating body 3 and make it generate a low level, so that the temperature of the main heating body 3 Maintain at the required temperature.

If you want to increase the temperature of the thick film heating element, you can adjust the two adjustable resistors CR1 and CR2 of the circuit control device. When their sensing resistance is adjusted to r ₃ , the temperature of the thick film heating element will continue to rise. Thereby the resistance of the main heating body 3 and the auxiliary heating body 1 increases slowly again, and when the resistance of the auxiliary heating body 1 reaches the sensing resistance size _r3 set on the line control device, the line control device senses this resistance immediately, and Generate a low-level output to the auxiliary heating body 1 and the main heating body 3. At this time, the corresponding temperature of the main heating body 3 and the auxiliary heating body 1 is T2. If you want to reduce the temperature of the thick film heating element, you can lower the line control device The sense resistor set above.

The utility model adopts a main heating body 3 track parts, and a PTC (positive temperature coefficient thermistor material) auxiliary heating body 1 track part, and has a temperature control circuit board 6 detection lines associated with them, Through the control of the resistance of the sub-heater 1 part by the temperature control circuit board 6, the temperature of the control sub-heater 1 part can be reached (because it can be seen from the resistance temperature curve that the resistance and temperature are linearly related, and one by one Corresponding, so that the purpose of temperature control can be achieved by controlling the resistance), when the auxiliary heating body 1 reaches the temperature set on the circuit of the temperature control circuit board 6, a low level will be generated on the line, thereby controlling the auxiliary heating body 1 Due to the low level generated on the line, the low level is reflected to the main heating body 3, so that the voltage of the main heating body 3 is reduced or cut off, and then the purpose of controlling the temperature of the main heating body 3 parts is achieved.

The above-mentioned embodiments are only used to illustrate the utility model for convenience, and are not intended to limit the utility model in any form. Anyone with ordinary knowledge in the technical field, if within the scope of the technical characteristics of the utility model , Equivalent embodiments made with partial changes or modifications using the technical content disclosed in the utility model, and without departing from the technical features of the utility model, all still fall within the scope of the utility model's technical features.

Claims (7)

1, a kind of Temperature Control Device For Thick-film High-power Electric Heating Components, include: the matrix made from stainless steel (9), go up electric insulation layer (2) in the covering on one of them main surface of matrix (9), it is characterized in that: main calandria (3) track and secondary calandria (1) track that the different tracks figure is set on interior electric insulation layer (2), electric insulation layer (4) outside covering on the trace graphics of main calandria (3) and secondary calandria (1), main calandria (3) and secondary calandria (1) are by lead (7) conducting temperature control circuit board (6).

2, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described secondary calandria (1) track end is provided with outstanding outer electric insulation layer (4) and is exposed to outer secondary terminal (8), and secondary terminal (8) is by lead (7) conducting temperature control circuit board (6).

3, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described main calandria (3) track end is provided with outstanding outer electric insulation layer (4) and is exposed to outer main terminal (5), and main terminal (5) is by lead (7) conducting temperature control circuit board (6).

4, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described secondary calandria (1) track adopts the material of positive temperature coefficient resistor characteristic, and secondary calandria (1) track partly is distributed in main calandria (3) exterior circumferential partly.

5, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described main calandria (3) is made up of two kinds of different temperature coefficient slurries at least with secondary calandria (1), is made of the ptc characteristics slurry of two kinds of different temperature coefficients.

6, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described main calandria (3) is made up of the slurry of two kinds of different side's resistances with secondary calandria (1), and the two final resistance that forms different sizes on the high-power heating components and parts of thick film.

7, Temperature Control Device For Thick-film High-power Electric Heating Components according to claim 1, it is characterized in that: described temperature control circuit board (6) is provided with two adjustable resistance CR1 and CR2, temperature control circuit board (6) is provided with and is used for responding secondary calandria (1) relay J 2 partly, and temperature control circuit board (6) is provided with and is used for the partly relay T1 of power supply of control and main calandria (3) track.

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