KR20070098133A - Electric heater for vehicle - Google Patents

Abstract

An electric heater for a vehicle is provided to reduce heat loss during conversion of electric power into heat by spirally installing a heat-generating carbon sheet module, a cooling fin and a cooling plate to HVAC or duct. An electric heater for a vehicle comprises a cooling fin(300) and a cooling plate(100). The cooling fin is installed to one surface of a heat-generating carbon sheet module(200) and dissipates heat radiated from the heat-generating carbon sheet module. The cooling plate is installed between the heat-generating carbon sheet module and the cooling fin. The heat-generating carbon sheet module, the cooling plate, and the cooling fin are spirally wound in a snail nozzle shape.

Description

ELECTRIC HEATER FOR VEHICLE}

1 is a perspective view showing an electric heater of a vehicle according to the prior art.

Figure 2b is a block diagram showing an electric heater of the vehicle according to the present invention.

Figure 2b is a block diagram showing an electric heater of a vehicle according to a modification of the present invention.

3 is a perspective view illustrating a carbon heating element sheet module of an electric heater of a vehicle according to the present invention;

4 is an enlarged view illustrating an enlarged portion “A” of FIG. 3.

<Code Description of Main Parts of Drawing>

100: heat dissipation plate 200: carbon heating element sheet module

210: insulating polymer plate 220: carbon printing layer

330: electrode layer 300: heat radiation fin

410: positive electrode 420: negative electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heater of a vehicle. The present invention relates to an electric heater of a vehicle that realizes excellent thermal efficiency by installing a carbon heating element sheet module, a heat dissipation fin, and a heat dissipation plate radially and installed in an HVAC or a duct.

In general, an electric preheater of an automobile includes a coolant heating preheater for heating the coolant and an air heating preheater for heating the air, and the air heating preheater is further divided into an air heating integral preheater and an air heating PTC independent preheater. Can be.

For example, the coolant heated preheater heats the coolant flowing into the heater heat exchanger through the resistance heating wire. However, such a cooling water heating preheater has a problem that the heating rate is slow due to heat loss due to the cooling water, and the resistance heating wire has a high risk of fire. In the case of a cooling water heating preheater using a PTC heating element to solve this problem, when the preheater rises above a certain temperature, the resistance increases rapidly due to the PTC characteristic.At this time, the current may be lowered to prevent the temperature from overheating, thereby preventing the fire concern. In the case of such a preheater, a heating rate for heating the cooling water takes a long time.

On the other hand, with reference to the accompanying drawings will be described with respect to the conventional air-heated pre-heater as follows.

1 shows a conventional air heated preheater.

As shown in FIG. 1, the air-heated preheater includes a plurality of heat dissipation fins 10 loaded therebetween, and between the heat dissipation fins 10, a PTC element assembly 20 assembled with an insulator in a state where a PTC element is fitted to a frame. Installed to form the heater core assembly. Upper and lower ends of the heater core assembly are respectively provided with an upper housing 30 and an end haiing 40, and the upper plates 30 and the side plates 50 which are tensioned by the end housing 40 are upper. It is assembled to the housing 30 and the end housing 40. At this time, the PTC device assembly 20 is a positive terminal, the negative terminal 60 is disposed on the side of the PTC device assembly 20, the positive terminal and the negative terminal 60 is alternately arranged in a state adjacent to each other A current is supplied to the PTC device.

However, such an air-heated preheater has a configuration in which the positive electrode terminal and the negative electrode terminal 60 are disposed adjacent to each other, and may cause a short when water penetrates.

In particular, the air-heated integrated preheater is configured to heat the air flowing around the heater core by arranging a PTC heating element using a PTC material, a heat dissipation fin, and a tube through which cooling water flows in the heater core. Only ~ 40% is transferred through the heat sink fins, and the rest of the heat is transferred to the tube through which the coolant flows.The heating effect is weak due to the large heat loss caused by the coolant, and the inrush current, which is a disadvantage of the PTC heating element, appears to exceed the battery capacity. There was a problem.

In addition, the resistance of the air-heated PTC independent preheater increases rapidly as the temperature rises, and there is a problem that the initial inrush current exceeds the battery capacity, and the PTC raw material powder must be molded and sintered when the preheater is manufactured. Since the PTC characteristic shows that a portion of the independent preheater area is used as a PTC element, the heat dissipation fin is used, and thus the temperature distribution for each part is not uniform. In addition, there is a problem that the productivity of the product is reduced due to the complicated assembly process and manufacturing difficulties.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an electric heater of a vehicle which reduces heat loss in a process for converting power into heat.

In addition, the present invention is to provide an electric heater of a vehicle that can be raised to a desired temperature in a short time.

In addition, the present invention is to provide an electric heater of a vehicle for improving the heat dissipation characteristics by maintaining a constant electric resistance for a long time.

In order to achieve the above object, the electric heater of the vehicle according to the present invention comprises a carbon heating element sheet module and a heat dissipation fin installed on one surface of the carbon heating element sheet module to radiate heat emitted from the carbon heating element sheet module.

In this case, it is preferable that a heat dissipation plate is further installed between the carbon heating element sheet module and the heat dissipation fin, and the carbon heat dissipation sheet module, the heat dissipation plate, and the heat dissipation fin may be radially wound to form a cochlear shape. In addition, the carbon heating element sheet module, the heat dissipation plate and the heat dissipation fins may be formed to be laminated with each other in an equilibrium.

In addition, the carbon heating element sheet module includes an insulating polymer plate, a carbon printing layer formed on the upper surface of the insulating polymer plate, and an electrode layer printed on the upper surface of the insulating polymer plate and electrically connected to the carbon printing layer. It can be configured by. Here, the electrode layer is formed extending in the longitudinal direction on the upper surface of the insulating polymer plate, the first electrode line electrically connected to the positive electrode, and the second electrode is arranged parallel to the first electrode line and electrically connected to the negative electrode A plurality of branch electrodes may be alternately disposed on the first electrode line and the second electrode line, the electrode lines extending from the opposite side. In addition, the carbon printing layer includes a plurality of carbon coating lines extending in the longitudinal direction on the upper surface of the insulating polymer plate, the plurality of carbon coating lines are electrically connected to the branch electrodes of the first and second electrode lines It may be configured to contact with.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2a is a view showing the configuration of the electric heater of the vehicle according to the invention, Figure 2b is a view showing the configuration of the electric heater of the vehicle according to a modification of the present invention, Figure 3 is a carbon of the electric heater of the vehicle It is a figure which shows the perspective view of a heating element sheet module, and FIG. 4 is an enlarged view of the "A" part of FIG.

As shown in Figures 2a to 4, the electric heater of the vehicle according to the present invention comprises a carbon heating element sheet module 200, and the heat radiation fin 300 is installed in close contact with the carbon heating element sheet module 200. . In this case, a separate heat dissipation plate 100 may be further installed between the carbon heating element sheet module 200 and the heat dissipation fin 300.

Specifically, the carbon heating element sheet module 200, the heat dissipation plate 100, and the heat dissipation fin 300 are formed in a cochlear shape wound radially on the one end thereof in a state in which they are in close contact with each other. At this time, the heat radiation fins 300 are formed between the adjacent heat dissipation plates 100 to allow air to flow and dissipate when heat is generated in the carbon heating element sheet module 200.

The heat dissipation plate 100 is a thin strip-shaped aluminum sheet having excellent thermal conductivity, and the carbon heating element sheet module 200 which generates heat when power is applied is closely attached to one surface thereof (the details thereof will be described later). The heat dissipation fin 300 for heat dissipating heat generated from the carbon heating element sheet module 200 to the outside is in close contact. At this time, the coupling between the carbon heating element sheet module 200 and the heat dissipation plate 100 and the heat dissipation fin 300 may be fixed by a conventional mechanical crimping, for example, a crimp cover of a separate star in a state in which they are in close contact with each other. You can install them further to fix them together.

As such, the form of the vehicle electric heater in which the carbon heating element sheet 200 is wound is not limited thereto, and may effectively radiate heat generated from the carbon heating element sheet module 200 through the heat radiating fin 300. Any structure that exists is included. For example, as illustrated in FIG. 2B, the carbon heating element sheet module 200, the heat dissipation plate 100, and the heat dissipation fin 300 may be stacked in a parallel state.

The heat dissipation fin 300 applied to the present invention has the same function as the heat dissipation fin 300 applied to a conventional electric heater in the function of dissipating heat radiated from the heating element to the outside, and a detailed description thereof will be omitted. However, preferably, the shape of the heat dissipation fin 300 may suggest a zigzag shape in contact with one surface of the heat dissipation plate 100, but may be in contact with a plurality of adjacent heat dissipation plates 100 to efficiently dissipate heat. Any shape may be used as long as it is a shape for expanding the contact area in contact with air.

The vehicle electric heater of such a configuration can be assembled and fixed to the air vent of the duct provided in the air conditioning HVAC, the installed electric heater to heat the flowing air when the power of 12 ~ 13.5V is applied to heat the inside of the vehicle, or the vehicle window Can remove frost or fog generated by At this time, the vehicle electric heater is further provided with a temperature sensor so that the power supply for heating prevention is cut off when heated to a predetermined temperature or more, so that the vehicle electric heater operates only within a certain temperature range. For example, the electric heater according to an embodiment of the present invention has a power capacity in the range of 0.1 ~ 1.5, KW at a voltage of 12 ~ 13.5V, the heating temperature is freely adjustable within the range of 20 ~ 300 degrees.

In addition, the conventional vehicle electric heater had a problem that the inrush current of the initial battery capacity exceeds 100 ~ 120A, but in the case of the vehicle electric heater according to the present invention can maintain the current within 70A, inrush current exceeding the capacity The advantage is that you can solve the problem.

Hereinafter, the carbon heating element sheet module will be described in detail.

The carbon heating element sheet module 200 includes an insulating polymer plate 210 and an electrode layer electrically connected to the carbon printing layer 220 and the carbon printing layer 220 formed on the upper surface of the insulating polymer plate 210. 230).

The electrode layer 230 may include a first electrode line 231 extending in a longitudinal direction on an upper surface of the insulating polymer plate 210 and a second electrode line 232 disposed parallel to the first electrode line 231. The first and second electrode lines 231 and 232 are electrically connected to the positive electrode 410 and the negative electrode 420, respectively. On the opposite side between the first electrode line 231 and the second electrode line 232, a plurality of branch electrodes 233 extending in a predetermined length in the opposite direction are formed, and the branch electrodes (1) of the first electrode line 231 are formed. The branch electrode 233 of the 233 and the second electrode line 232 are alternately arranged. The electrode layer 230 is preferably made of a material having high electrical conductivity, such as aluminum (Al), iron (Fe), copper (Cu), silver (Ag).

The carbon print layer 220 is formed by heating and pressing conductive carbon raw materials such as carbon, carbon black charcoal powder, and graphite powder at high temperature and high pressure, and then cooling to form carbon powder, and then mixing the carbon powder thus formed with a binder. It is to be formed on the upper surface of the insulating polymer plate (210). In particular, when the carbon powder is formed, the angle of the outermost orbital electrons is controlled by the atmosphere GAS and the cooling rate from which the carbon powder is extracted. That is, the larger the separation angle between the four electrons moving the outermost L orbit, the greater the resistance rather than the conductivity, thereby increasing the heating effect. As described above, the carbon print layer 220 formed on the upper surface of the insulating polymer plate 210 has a plurality of carbon coating lines so as to be in electrical contact with the branch electrodes 233 of the first and second electrode lines 232. Form.

In addition, the carbon printing layer 220 and the electrode layer 230 may be formed with an insulating layer to prevent the electricity supply to the outside. That is, the insulating layer is made of a heat-resistant insulating material such as polyamide so that the carbon printing layer 220 and the electrode layer 230 formed on the insulating polymer plate 210 do not conduct electricity with other conductive materials.

On the other hand, a description will be given of a method for manufacturing a vehicle electric heater according to the present invention.

First, the carbon heating element sheet module 200 is manufactured, the heat dissipation plate 100 and the heat dissipation fin 300 are brought into close contact with the carbon heating element sheet module 200, and the coils are wound and molded into a cochlear shape to complete the vehicle electric heater. At this time, the heat dissipation plate 100 and the heat dissipation fins 300 may be in close contact with each other in parallel to the carbon heating element sheet module 200 to form a laminate.

In order to manufacture the carbon heating element sheet module 200, first, after preparing the carbon slurry mixture, the carbon slurry mixture is printed on the insulating polymer plate 210 to form the carbon print layer 220, and the insulating polymer plate The electrode layer 230 electrically connected to the carbon print layer 220 printed on 210 is printed.

For example, the carbon slurry mixture liquid for preparing the carbon heating element sheet module 200 is prepared by first preparing carbon or carbon black charcoal powder, graphite powder, and the like, which are conductive carbon raw materials, and then introducing the carbon slurry into a chamber having a predetermined capacity. When the conductive carbon raw material is filled in the chamber, the chamber is heated and pressurized to a temperature in the range of about 1500 to 3000 degrees and a pressure in the range of 5 to 15 atmospheres to dissolve the carbon component. The carbon component to which the high temperature and high pressure is applied is injected into the liquid through a fine nozzle provided in the chamber. The injected carbon liquid is cooled in a vacuum at a constant speed, and the carbon liquid is solidified into the carbon powder through the cooler. At this time, by adjusting the separation angle between the four electrons moving the outermost L orbit by the atmosphere GAS and the cooling rate to extract the carbon powder to increase the resistance than the conductivity to increase the heat generation effect. As such, when the carbon powder having a constant current and resistance value is produced at a desired constant voltage, the resulting carbon powder is mixed with a predetermined amount of binder to prepare a carbon slurry mixture.

In another embodiment, the carbon slurry mixture liquid for manufacturing the carbon heating element sheet module 200 may include a dispersant added to an organic insulator compound, a ceramic binder, and a resistive material of a highly resistant metal material such as Ni, Cr, Mo, or the like. It can also manufacture.

As such, when the carbon slurry mixture solution is produced, the carbon slurry mixture solution is printed on the heat-resistant flexible insulating polymer plate 210, such as polyamide, in a plurality of lines with a predetermined thickness by rolling or spraying to form a plurality of carbons. Form a coating line.

Subsequently, an electrode layer 230 including the first electrode line 231 and the second electrode line 232 is electrically connected to the carbon coating line formed on the insulating polymer plate 210. At this time, the electrode lines connected to each of them are connected in parallel with one pole as the anode and the other as the cathode, and finally, the positive and negative electrodes are connected by wiring so that the anode and the cathode are alternately arranged so that the carbon heating element sheet module ( 200) is prepared. In addition, it is preferable to seal a heat-resistant insulating layer such as polyamide on the carbon print layer 220 and the electrode layer 230 so as not to penetrate with other conductive materials.

When the carbon heating element sheet module 200 is manufactured as described above, the carbon heating element sheet module is formed by forming the heat dissipation fins 300 on the carbon heating element sheet module 200 and forming the coils to be wound around one end thereof. 200 and the heat radiation fins 300 are wound radially to complete the vehicle electric heater formed in the cochlear shape. In this case, the carbon heating element sheet module 200 and the heat dissipation fin 300 may be configured to be stacked in parallel with each other, and the heat dissipation plate 100 is interposed between the carbon heating element sheet module 200 and the heat dissipation fin 300. May be

Through this, the heat dissipation fin 300 and the heat dissipation plate 100 in close contact with the carbon heating element sheet module 200 may effectively dissipate heat generated from the carbon heating element sheet module 200 when power is applied to the electric heater. .

On the other hand, the electric heater of this configuration is installed in the HVAC of the vehicle air conditioner when the outside air is introduced by the blowing fan to heat the air to remove the frost formed on the glass window of the vehicle, it is possible to heat the inside of the vehicle. In particular, when the initial start-up of the vehicle, the power is applied to the electric heater and at the same time the carbon heating element sheet module generates heat, so in the case of the conventional electric heater, the engine is not immediately heated, the heating is not performed at the initial start, or frost, fog It can solve problems that cannot be removed.

In addition, by installing a temperature sensor capable of detecting overheating of the heating element in the electric heater, it is possible to prevent the heating of the heating element by blocking the power supply to the electric heater when the temperature rises above a predetermined temperature.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as provided by the following claims. It will be obvious to those of ordinary skill.

As described above, according to the present invention, there is an advantage that the electric heater of the vehicle can obtain excellent thermal efficiency by making a small heat loss in the process for converting power to heat.

In addition, the present invention has the advantage of reducing the inrush current peak, it is possible to shorten the time required to rise to the desired temperature.

In addition, the present invention has the advantage that the warranty time for keeping the electric resistance constant is maintained for a long time compared with the conventional PTC preheater, thereby improving the heat dissipation characteristics of the electric heater and reducing the required cost of manufacturing.

Claims (7)

Carbon heating element sheet module, Is installed on one surface of the carbon heating element sheet module electric heater of the vehicle comprising a heat dissipation fin to dissipate heat emitted from the carbon heating element sheet module. The method according to claim 1, Between the carbon heating element sheet module and the heat radiation fins Electric heater of the vehicle, characterized in that the heat radiation plate is further installed. The method according to claim 1 or 2, The carbon heating element sheet module and the heat dissipation plate and the heat dissipation fins The electric heater of the vehicle, characterized in that the radially wound to form a cochlea. The method according to claim 1 or 2, The carbon heating element sheet module and the heat dissipation plate and the heat dissipation fins An electric heater of a vehicle, which is formed to be stacked on each other in a balanced manner. The method according to claim 1 or 2, The carbon heating element sheet module Insulating polymer plates; A carbon printing layer formed on an upper surface of the insulating polymer plate; And an electrode layer printed on an upper surface of the insulating polymer plate and electrically connected to the carbon printing layer. The method according to claim 5, The electrode layer is A first electrode line extending in a longitudinal direction on an upper surface of the insulating polymer plate and electrically connected to a positive electrode; A second electrode line disposed in parallel with the first electrode line and electrically connected to the negative electrode; The first electrode line and the second electrode line An electric heater of a vehicle, characterized in that a plurality of branching electrodes extending to the opposite side are alternately arranged. The method according to claim 6, The carbon print layer It includes a plurality of carbon coating lines extending in the longitudinal direction on the upper surface of the insulating polymer plate, And the plurality of carbon coating lines are in electrical contact with branch electrodes of the first and second electrode lines.

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