KR101132694B1 - Hybrid ceramic-positive temperature coefficent heater - Google Patents

Abstract

The present invention discloses a hybrid ceramic constant temperature coefficient heater. Hybrid ceramic constant temperature coefficient heater of the present invention is disposed at intervals, and the first and second ceramic heaters are respectively connected to the power supply through an external lead wire; A constant temperature coefficient heater unit disposed between the first ceramic heater unit and the second ceramic heater unit and electrically connected to each of the first ceramic heater unit and the second ceramic heater unit to form an electrical series state; And a brazing layer for welding the first ceramic heater portion, the positive temperature coefficient heater portion, and the positive temperature coefficient heater portion and the second ceramic heater portion. The first and second ceramic heater sections include a tungsten layer and an alumina layer surrounding the tungsten layer. And the constant temperature coefficient heater part is comprised as barium titanate as a main component. The brazing layer includes a molybdenum alloy layer portion and a nickel layer portion. According to the present invention, by having the advantages of the ceramic heater and the constant temperature coefficient heater at the same time, the rate of temperature rise up to the target temperature is very fast, it is possible to constantly control the heat generation temperature at the target temperature. In particular, since the temperature increase rate is very fast and the exothermic temperature can be controlled constantly, it can be very usefully used for a device requiring rapid heating and temperature control.

Description

HYBRID CERAMIC-POSITIVE TEMPERATURE COEFFICENT HEATER}

1 is a perspective view showing the configuration of a hybrid ceramic constant temperature coefficient heater according to the present invention;

Figure 2 is a side cross-sectional view showing the configuration of a hybrid ceramic constant temperature coefficient heater according to the present invention,

3 is a diagram illustrating the resistance-temperature characteristics of the hybrid ceramic constant temperature coefficient heater according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10: first ceramic heater unit 12: tungsten layer

14: alumina layer 15: outer lead wire

20: second ceramic heater 22: tungsten layer

24: alumina layer 25: outer lead wire

30: constant temperature coefficient heater unit 40: brazing layer

42 nickel layer portion 44 molybdenum alloy layer portion

50: heat exchange member 60: brazing layer

62: nickel layer portion 64: molybdenum alloy layer portion

The present invention relates to a hybrid ceramic constant temperature coefficient heater, and more particularly, by combining a ceramic heater and a constant temperature coefficient heater, the temperature increase rate to the target temperature is high, and the heating temperature at the target temperature can be constantly controlled. The present invention relates to a hybrid ceramic constant temperature coefficient heater.

An example of an electric heater is a ceramic heater. The ceramic heater is composed of a tungsten layer that generates heat by an applied current and an alumina layer that is heated to generate high temperature heat.

Such a ceramic heater has the advantage that the temperature increase rate is very fast. Therefore, it is mainly used for a hot water heater, a hair care device for a perm, and a soldering machine which require quick temperature rising. In addition, ceramic heaters are widely used in medical devices because far infrared rays are radiated from the alumina layer during heating.

By the way, such a ceramic heater has the advantage that the temperature increase rate is very fast, but there is a disadvantage that the temperature control is difficult to control the heating temperature. In particular, there is a disadvantage that the energy consumption is high because the heating temperature can not be adjusted.

Meanwhile, in view of this, a positive temperature coefficient (hereinafter, referred to as a "PTC heater") heater has been developed and used. The PTC heater is a resistor made of barium titanate-based and generates high temperature heat by an applied current. In particular, as the temperature rises, the resistance rises to suppress the flow of current. If the resistance value is detected at this time and the flow of current is controlled, the heating temperature can be controlled at a constant temperature.

Since the PTC heater is very easy to control the heating temperature, it is widely used as a preliminary heating device in an electric rice cooker, a coffee pot, and a vehicle interior where the heating temperature control is required.

By the way, the PTC heater has the advantage that the control of the heating temperature is very easy, but there is a disadvantage that it is very inconvenient to use because the temperature increase rate is very slow. In particular, when used as a preliminary heating device in a car interior, the temperature of the car must be rapidly increased until the coolant of the car rises to a high temperature, and the temperature in the car must be raised. There was no problem. This problem causes the product's reliability to fall by not satisfying the needs of the driver.

Accordingly, the present invention has been made to solve the above-mentioned problems, the object of which is to combine the ceramic heater and the constant temperature coefficient heater to increase the temperature increase rate to the target temperature, the exothermic temperature at the target temperature It is to provide a hybrid ceramic constant temperature coefficient heater that is very easy to use under constant control.

In order to achieve the above objects, the hybrid ceramic constant temperature coefficient heater of the present invention is disposed at intervals, and the first and second ceramic heaters are respectively connected to the power supply through an external lead wire; A constant temperature coefficient heater unit disposed between the first ceramic heater unit and the second ceramic heater unit and electrically connected to each of the first ceramic heater unit and the second ceramic heater unit to form an electrical series; And a brazing layer for welding the first ceramic heater unit, the positive temperature coefficient heater unit, and the positive temperature coefficient heater unit and the second ceramic heater unit.

Preferably, the first and second ceramic heaters comprise a tungsten layer and an alumina layer surrounding the tungsten layer. And the said constant temperature coefficient heater part is comprised from barium titanate as a main component. The brazing layer is composed of a molybdenum alloy layer portion and a nickel layer portion.

Hereinafter, a preferred embodiment of a hybrid ceramic constant temperature coefficient heater according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 1 and 2, the heater of the present invention includes a first ceramic heater unit 10 and a second ceramic heater unit 20 disposed at intervals.

Each of the first and second ceramic heaters 10 and 20 includes a tungsten layer 12 and 22 in the center of the resistor, alumina layers 14 and 24 on both sides thereof, and tungsten layers 12 and 22. And external lead wires 15 and 25 electrically connected to each other. In particular, the external lead wires 15 and 25 are configured to be connected and connected to an external power source, respectively.

When the first and second ceramic heaters 10 and 20 are supplied with power to the central tungsten layers 12 and 22, the tungsten layers 12 and 22 are rapidly heated, and the alumina layers 14 and 24 are heated. ) Is heated, and the heated alumina layers 14 and 24 emit hot heat.

Here, since the ceramic heater composed of the tungsten layers 12 and 22 and the alumina layers 14 and 24 is a well known technique, description thereof will be omitted.

Referring again to FIGS. 1 and 2, the heater of the present invention includes a positive temperature coefficient heater unit 30, which is provided between the first ceramic heater unit 10 and the second ceramic heater unit 20, hereinafter, “PTC. Heater section ").

PTC heater unit 30 is a kind of resistor that generates heat by the applied current, one side (30a) is electrically connected to the tungsten layer 12 of the first ceramic heater unit 10, the other side (30b) The tungsten layer 22 of the second ceramic heater unit 20 is electrically connected to the tungsten layer 22. In particular, each of the one side 30a and the other side 30b is electrically connected to the tungsten layers 12 and 22 of the first ceramic heater unit 10 and the second ceramic heater unit 20, respectively, thereby providing a first ceramic. The heater unit 10 and the PTC heater unit 30 and the second ceramic heater unit 20 can be connected in series with each other, so that the current applied to the first ceramic heater unit 10 is the PTC heater unit. Via 30 may be applied to the second ceramic heater unit 20.

For reference, a PTC heater is a kind of semiconductor composed mainly of barium titanate (BaTiO ₃ ), which generates heat by an applied current. Control characteristics.

According to the PTC heater unit 30, the current applied to the first ceramic heater unit 10 is transmitted to the second ceramic heater unit 20, whereby the second ceramic heater unit 20 is applied by the current applied thereto. Allow to generate heat at high temperatures.

In addition, since the PTC heater unit 30 receives electricity from the first ceramic heater unit 10, the PTC heater unit 30 generates heat by the applied current. In particular, the generated heat rises to a predetermined target temperature and is constantly controlled. In addition, since the uniformly controlled heat is transmitted to the first and second ceramic heaters 10 and 20 on both sides, the temperature of the first and second ceramic heaters 10 and 20 is constantly controlled.

Here, a connection terminal 12a electrically connected to one side surface 30a of the PTC heater unit 30 is formed in the tungsten layer 12 of the first ceramic heater unit 10. In addition, the tungsten layer 22 of the second ceramic heater unit 20 also includes a connection terminal 22a electrically connected to the other side surface 30b of the PTC heater unit 30.

Meanwhile, as shown in FIG. 2, the PTC heater unit 30 is connected to and bonded to the first ceramic heater unit 10 and the second ceramic heater unit 20, but is welded through the brazing layer 40. Combined.

The brazing layer 40 is composed of both nickel layer portions 42 and the molybdenum alloy layer portion 44 in the center, wherein both nickel layer portions 42 are ceramic heater portions 10 and 20 and PTC heater portions ( 30) is easily welded to. The central molybdenum alloy layer 44 serves to easily weld both nickel layers 42.

As a result, the brazing layer 40 facilitates bonding between the PTC heater unit 30 made of different materials and the first and second ceramic heater units 10 and 20. In addition, the welding temperature of the brazing layer 40 is good to comprise about 600 degreeC.

Again, referring to FIG. 2, the heater of the present invention further includes a heat exchange member 50 installed on outer surfaces of the first and second ceramic heaters 10 and 20.

The heat exchange member 50 is composed of heat dissipation fins, and serves to discharge heat generated from the first and second ceramic heaters 10 and 20 to the outside. In particular, since a plurality of the first and second ceramic heaters 10 and 20 are attached along the first and second ceramic heaters 10 and 20, the heat generated from the first and second ceramic heaters 10 and 20 is effectively discharged.

On the other hand, the heat exchange member 50 is welded through the brazing layer 60, the brazing layer 60 is composed of a nickel layer portion 62 and molybdenum alloy layer portion 64 as described above. The brazing layer 60 facilitates bonding between the heat exchange member 50 made of different materials and the first and second ceramic heaters 10 and 20.

Next, an operation example of the present invention having such a configuration will be described with reference to FIGS. 1 and 2. First, a current is applied to the external lead wire 15 of the first ceramic heater unit 10. Then, the applied current passes through the first ceramic heater unit 10, the PTC heater unit 30, and the second ceramic heater unit 20, which are connected in series, in turn, and the external lead wire 25 of the second ceramic heater unit 20. ) To the outside.

On the other hand, while the applied current flows through the first and second ceramic heater parts 10 and 20, the tungsten layers 12 and 22 of the first and second ceramic heater parts 10 and 20 have a high speed. The alumina layers 14 and 24 are heated while raising the temperature. The heated alumina layers 14 and 24 quickly release high temperature heat.

At this time, the first and second ceramic heaters 10 and 20 heated at a high speed serve to heat the surrounding temperature rapidly, and thus, a device for which rapid heating is required, for example, a hot water heater and a hair for perm. If the heater of the present invention is provided to a manager, a soldering machine, and an indoor preheating device of an automobile, it can be very usefully used. In particular, when used as a preliminary heating device for a vehicle, the temperature in the vehicle can be rapidly increased, thereby satisfying a driver's desire for rapid in-vehicle heating.

In addition, while the applied current flows through the PTC heater unit 30, the PTC heater unit 30 generates heat by the applied current. In particular, the first and second ceramic heaters 10 and 20 are heated by dissipating the generated heat to the outside and transferring the first and second ceramic heaters 10 and 20 to both sides.

At this time, since the PTC heater unit 30 that generates heat is constantly controlled after the generated heat rises to a predetermined target temperature, the PTC heater unit 30 constantly controls the heat generation temperatures of the first and second ceramic heater units 10 and 20 on both sides. do.

The PTC heater unit 30 controls not only the heat generation temperature of the vehicle body but also the heat generation temperatures of the first and second ceramic heater units 10 and 20, thereby controlling the heat generation temperature of the entire heater. In particular, since it plays a role of controlling the heating temperature of the entire heater, it is very useful to install the heater of the present invention, such as an electric rice cooker, a coffee pot, a preliminary heating device of a car, etc. that requires the control of the heating temperature. Can be used.

Next, the present inventors tested the resistance-temperature characteristics (R-T characteristics) as in FIG. 3 to test the performance of the hybrid ceramic constant temperature coefficient heater according to the present invention.

(Exam conditions)

The electrical resistance of the heater at ambient temperature below 1,5V DC was measured.

As a result of the test, when the ambient temperature of the heater reaches room temperature (reference temperature) from 25 ℃ to the target temperature of 175 ~ 180 ℃, the resistance value increases rapidly to twice the room temperature resistance value, thus reaching the Curie temperature. As a result of the rapid decrease in the flow of current, the ambient temperature of the heater was found to be kept constant at the target temperature (175 to 180 ° C).

As a result, the hybrid ceramic positive temperature coefficient heater according to the present invention, as well as quickly heated up to the target temperature, it was shown that the heating temperature is constantly controlled at the target temperature.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

As described above, according to the hybrid ceramic constant temperature coefficient heater according to the present invention, by having the advantages of the ceramic heater and the constant temperature coefficient heater at the same time, the temperature increase rate to the target temperature is very fast, and the heat generation temperature at the target temperature is constant. Can be controlled. In particular, since the temperature increase rate is very fast and the exothermic temperature can be controlled constantly, it can be very useful for a device requiring rapid heating and temperature control at the same time.

Claims (5)

First and second ceramic heaters 10 and 20 disposed at intervals and connected to a power source through external lead wires 15 and 25, respectively; It is installed between the first ceramic heater unit 10 and the second ceramic heater unit 20, and is electrically connected to each of the first ceramic heater unit 10 and the second ceramic heater unit 20, A constant temperature coefficient heater unit 30 in series; A hybrid ceramic including a brazing layer for welding the first ceramic heater unit 10, the positive temperature coefficient heater unit 30, and the positive temperature coefficient heater unit 30 and the second ceramic heater unit 20. In constant temperature coefficient heater, The first ceramic heater unit 10 is composed of a tungsten layer 12 and an alumina layer 14 surrounding the tungsten layer 12 on both sides, The second ceramic heater unit 20 is composed of a tungsten layer 22 and an alumina layer 24 surrounding the tungsten layer 22 on both sides, The constant temperature coefficient heater unit 30 is composed of barium titanate as a main component, The inner two brazing layers 40 of the brazing layer are composed of a molybdenum alloy layer portion 44 and a nickel layer portion 42 surrounding the molybdenum alloy layer portion 44 on both sides, The two outer brazing layers 60 of the brazing layer are composed of a molybdenum alloy layer portion 64 and a nickel layer portion 62 disposed inside the molybdenum alloy layer portion 64. Hybrid ceramic constant temperature heater with combined temperature heater. delete delete delete delete

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