KR100972095B1 - Electric Heater for Air Conditioner of a Car - Google Patents

Abstract

The present invention relates to an electric heat heater for an automotive air conditioner, and more particularly, by electrically and mechanically protecting a heating element including a PTC element from the outside, preventing the heating element from being damaged or separated by an external force, The present invention relates to a heat transfer heater for a vehicle air conditioner which prevents a short circuit, prevents the ingress of impurities from the outside, increases the calorific value and thermal conductivity, and improves assembly and productivity.

To this end, the present invention includes a plurality of heat dissipation fins 3 disposed between the first and second support frames 1 and 2 facing each other; At least one 'U' curved portion 4a, 5a; 14a, 15a at least one end portion of each of the plurality of heat dissipation fins 3 disposed at a distance from each other, and at least one end of each of the opposing ends. 24a, 24b; 25a, 25b) and a pair of heating element support plates (4, 5; 14, 15; 24, 25) consisting of a straight portion extending from the 'U' curved portion to form an integrated heat dissipation core And a pair of heating elements 7 that generate heat by electricity supplied from the outside in the pair of heating element support plates, and the pair of heating element support plates has at least one 'U' shaped curve formed at one end thereof. It is characterized in that it is elastically in close contact with each other by the part is sealed from the outside to surround the heating element (7).

Electric Heater, Heating Element, Tube, Heat Dissipation Fin, Heat Dissipation Core, PTC Element, Support Plate

Description

Electric Heater for Air Conditioner

1 is a cross-sectional view showing the configuration of a heat transfer heater according to the prior art.

Figure 2 is a front view of the heat transfer heater according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG. 2 in a state in which a pair of case members for fastening the first and second support frames are omitted.

4 is a cross-sectional view of a structure of a heating element support plate according to another embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1 ... first frame

2 ... second frame

3, 53 ... heat sink fins

4, 5, 14, 15, 24, 25 ... heating element support plate

4a, 5a, 14a, 15a, 24a, 24b, 25a, 25b ... 'U' curved part

6 ... heat sink fin support plate

7, 54 ... heating element                 

7a, 7b, 54b ... PTC element

7c ... electrode plate

11 ... glue

54a ... metal strip

54c ... fixing member

55 ... Visit the web

56 .. Waveform Spring

The present invention relates to an electric heat heater for an automotive air conditioner, and more particularly, by electrically and mechanically protecting a heating element including a PTC element from the outside, preventing the heating element from being damaged or separated by an external force, The present invention relates to a heat transfer heater for a vehicle air conditioner which prevents a short circuit, prevents the ingress of impurities from the outside, increases the calorific value and thermal conductivity, and improves assembly and productivity.

In general, a vehicle air conditioner includes a cooling system for cooling the interior of a vehicle, and a heating system for heating the interior of the vehicle. The cooling system compresses the refrigerant by a compressor driven by the engine and sends the refrigerant to the condenser. The refrigerant is condensed by the forced blow of the cooling fan, and the refrigerant is then transferred to the receiver dryer, the expansion valve and the evaporator. And then back to the compressor. In this process, air is blown by the blower unit of the blower unit installed at the inlet of the air conditioning case and the refrigerant passing through the evaporator is exchanged to discharge the blower air to the vehicle interior in a cold state, thereby cooling the vehicle interior. .

Meanwhile, the heating system heat-exchanges the air blown by the blower fan of the blower unit and the coolant passing through the heater core in the process of returning the coolant of the engine to the engine through the heater core, thereby discharging the blower air to the vehicle interior in a warm state. Heat the differential car's interior.

In particular, the heating system is to heat the interior of the car with the cooling water flowing around the engine sufficiently heated after the engine is started, but in the winter, the engine and the cooling water are cooled to sub-zero temperatures, so that the engine heats up. Since it takes a long time to rise above this constant temperature, the effect of initial heating after engine operation cannot be expected.

Accordingly, electric heaters using PTC (Positive Temperature Coefficient) elements having positive temperature characteristics in which resistance values increase with temperature rise have been developed for initial heating of automobiles.

The heat transfer heater using the PTC element is disposed near a common heater core installed in the case of the air conditioner and directly heats the air, thereby increasing the temperature of the vehicle interior from the initial driving of the engine to the normal driving.

Fig. 1 shows a cross-sectional view of a heat transfer heater for a vehicle air conditioner according to the prior art as one example thereof.

As shown in FIG. 1, the electrothermal heater has a plurality of corrugated heat dissipation fins 53 having a predetermined length between the upper and lower frames 51 and 52 facing each other, and are arranged at predetermined intervals. The heating elements 54 are interposed between the heat dissipation fins 53, and the inner web 55 is disposed outside the heat dissipation fins 53 adjacent to the upper and lower frames 51 and 52, respectively. The corrugated spring 56 is mounted between the frame 51 or the lower frame 52 and the inner web 55.

The heating element 54 is composed of a metal strip piece 54a spaced up and down and a fixing member 54c which is an insulating material for fixing the PTC element 54b between the metal strip piece 54a.

The stacked components as described above are fixed to one assembly by the side frame 57. On the other hand, a terminal 58 is connected to one end of the metal strip piece 54a to be connected to the electrical wiring so as to protrude a predetermined length to the outside of the side frame 57. Reference numeral '59' denotes a support belt firmly fixed to the heat dissipation fins 53 therein.

The conventional heat transfer heater can increase the heating performance from the initial driving of the engine until the temperature of the engine rises, but has the following problems.

First, since the metal strip piece 54a constituting the heating element 54 is not electrically insulated from the adjacent heat dissipation fins 53, when a large amount of conductive liquid and metal are introduced from the outside, an electrical short circuit occurs and an electrical accident occurs. And there was a problem that causes the occurrence of fire.                         

Second, since the heating element 54 is exposed to the outside simply interposed between the radiating fins, there is a problem that the heating element 54 is broken or separated by severe vibration of the vehicle body.

Third, since the upper and lower frames 51 and 52 are fixed only by the side frame 57 while the corrugated spring 56 and the heat radiating fin 53 are pressed, the side frame 57 is subjected to excessive pressure. In addition, the external force applied to the central portion of the heat transfer heater is relatively reduced, so that the metal strip piece 54a constituting the heating element 54 and the heat dissipation fin 53 are not in close contact with each other, thereby deteriorating thermal conductivity.

Fourth, since the fixing band 54c provided between the metal strip pieces 54a is made of an insulator, not only electricity is transmitted but also heat transfer is disturbed, and the PTC element 54b is made of a semiconductor ceramic material which is poor in heat transfer. Therefore, when only a part of the heating elements 54 of the plurality of heating elements 54 provided between the radiating fins for power capacity adjustment is applied, the PTC element of the heating element that is not energized acts as a heat insulator, so that the heat transfer is not diffused as a whole. There was a problem occurring.

Fifth, the waveform spring 56 is installed between the upper and lower frames 51 and 52 and the outer side of the heat dissipation fin 53 to press the outer side of the heat dissipation fin 53, but the shape of the waveform spring 56 is Due to the characteristic, excessive force is transmitted to an arbitrary point of the heat dissipation fin 53, so that the number of parts is increased by installing a separate inner web 55 to prevent the heat dissipation fin 53 from buckling. There was also a problem that the assembly work efficiency and productivity is low.

Accordingly, an object of the present invention is to electrically and mechanically protect the heating element provided between the heat dissipation fins in order to solve the above-mentioned problems, while preventing the heating element from being damaged or separated by an external force, To prevent accidents and fires caused by fire, and also to prevent intrusion of impurities from the outside, to ensure that the contact between the components of the heating elements are always in close contact, thereby increasing the heating value and thermal conductivity of the heating elements, and further adjusting the capacity of the battery. In order to provide a heat transfer heater for an automotive air conditioner, even if only a few of the heating elements are energized, heat transfer is spread to all parts of the heater, and the number of parts as a whole can be reduced to improve assembly and productivity. have.

In order to achieve the above object, the present invention, the first and second support frame facing each other;

A plurality of heat dissipation fins disposed at predetermined intervals to facilitate heat transfer between the first and second support frames;

A heat dissipation fin support plate provided at intervals between the plurality of heat dissipation fins, respectively, and at least one curved portion and at least one curved portion extending from the curved portion, at least one end of each opposite end portion thereof, A pair of heating element support plates which are elastically in close contact and sealed from the outside to surround the heating element;                     

A pair of PTC elements installed in the pair of heating element support plates and disposed to face each of the heating element support plates so as to generate heat by electricity supplied from the outside, and an electrode plate interposed between the pair of PTC elements. A heating element;

And first and second cases coupled to both ends of the first and second support frames.

The present invention is characterized in that in the heat transfer heater for an automobile air conditioner, the heat dissipation fin, the pair of heating element support plates, and the heat dissipation fin support plate are brazed to form an integral heat dissipation core.

In another aspect, the present invention is characterized in that the electrode plate has a positive polarity so that electricity having different polarities is applied to the pair of heating element support plates and the electrode plate in the heat transfer heater for an automobile air conditioner. .

In addition, the present invention, in the heat transfer heater for a vehicle air conditioner, the pair of heating element support plates, each asymmetrical structure extending from one 'U' curved portion and the 'U' curved portion at each end. It has a straight portion, and the 'U' curved portion of each of the heating element support plate is in contact with the straight portion of the heating element support plate facing each other, one end of the PTC element of the pair of heating element support plate of one of the heating element support plate of the pair It is in contact with the end of the curved portion, characterized in that the one end of the PTC element is in contact with the end of the 'U' curved portion of the other heating element support plate.

In addition, the present invention, in the heat transfer heater for a vehicle air conditioner, the pair of heating element support plates, each of which has a symmetrical structure and extends from one 'U' curved portion at each end and the 'U' curved portion at both ends. Each of the two ends of the pair of PTC elements is disposed in the 'U' curved portion of the heating element support plate, the electrode plate is disposed so as to be close to the end contacted by each curved portion of the pair of heating element support plate. It is characterized by.

In addition, the present invention, in the heat transfer heater for a vehicle air conditioner, the pair of heating element support plate, the `` U '' curved portion and the `` U '' curved portion formed in a symmetrical structure close to the heat radiating fin side at each end, respectively. A U-shaped curved portion extending from the U-shaped curved portion in a direction opposite to the “U” shaped curved portion, wherein the “U” shaped curved portion adjacent to the heat dissipating fin is connected to a straight portion along the longitudinal direction of the heat dissipating fin, A portion of each end portion is arranged to be in contact with a portion of the 'U' curved portion that is opposite to the 'U' curved portion formed close to the heat dissipation fin side.

In addition, the present invention is characterized in that, in the heat transfer heater for a vehicle air conditioner, an adhesive is applied to both ends of the pair of heating element support plates in contact with each other in order to improve the sealing property from the outside.

In another aspect, the present invention is characterized in that the insulator is installed in the heat transfer heater for a vehicle air conditioner to prevent an electrical short between the electrode plate and the end contacting the heating element support plate.

Hereinafter, a preferred embodiment of the heat transfer heater according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a front view of an electric heater for an automotive air conditioner according to the present invention, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 in a state in which a pair of cases for fastening the first and second support frames are omitted in FIG. to be.

2 and 3, the heat transfer heater according to the present invention is a corrugated type formed by a thin aluminum sheet to facilitate heat transfer between the first and second support frames 1 and 2 facing each other on the left and right sides. A plurality of heat dissipation fins 3 are arranged in the longitudinal direction at predetermined intervals, and between the heat dissipation fins 3, a pair of heating element support plates 4 and 5 and heat dissipation fin support plates 6 are alternately installed at intervals. Inside the pair of heating element support plates 4, there is provided a heating element 7 which generates heat by an external electric supply, and the first and second cases 8 and 9 are provided in the first and second cases. In order to fasten the support frames 1 and 2, the first and second support frames 1 and 2 are perpendicular to the longitudinal direction, respectively.

The heat dissipation fins 3, the pair of heating element support plates 4 and 5, and the heat dissipation fin support plates 6 are brazed in a furnace in a state of being supported by a jig after being preassembled. Since they are bonded, they are firmly coupled to each other as an integrated heat dissipation core. However, the heating element support plate 4 into which the heating element 7 is to be inserted is brazed after temporarily inserting a dummy plate of a predetermined thickness of a material that is not brazed therein so as to maintain its shape. When the brazing process is completed, the dummy plate is removed and the component of the heating element 7 described later is inserted in the position.

In addition, the pair of heating element support plates 4 and 5, as shown in Fig. 3, have an asymmetric structure, each having a 'U' curved portion 4a, 5a at the end in a cross-sectional shape, and the 'U' Has straight portions 4b and 5b extending from the curved portions 4a and 5a in the longitudinal direction of the heat dissipation fins 3.

The pair of heating element support plates 4 and 5 configured as described above is configured to support the heating element support plates 4 by the pressing force from the first and second support frames 1 and 2 provided at the outermost side when the heat dissipation core is assembled. The heating element support plate 4 in which the straight portion 4b is in close contact with the 'U' curved portion 5a of the heat generating element support plate 5, and the straight portion 5b of the heating element supporting plate 5 is opposite. It is sealed from the outside by being in close contact with the 'U' curved portion 4a. That is, when the heat dissipation cores are brought into close contact with the first and second support frames 1 and 2, each of the 'U' curved portions 4a and 5a of the heating element support plates 4 and 5 has a shape structure. It is bent by elasticity, whereby each of the straight portions 4b, 5b of the corresponding heating element support plates 4, 5 is strongly adhered to the 'U' curved portions 4a, 5a to be cut off from the outside. As a result, the pair of heating element support plates 4 and 5 have a sealed inner space, thereby preventing foreign matter from entering the outside.

On the other hand, the heating element (7) installed inside the sealed heating element support plates (4, 5) as described above, as shown in detail in Figure 3, a pair of PTC elements (7a, 7b) opposed to both sides, It has a three-layer structure including an electrode plate 7c made of a conductive metal interposed between the pair of PTC elements 7a and 7b.

In the present invention, when the electrode plate 7c is located between the pair of PTC elements 7a and 7b as described above, the electrode plate 7c acts as a positive electrode, and the heat radiation fins 3 are By allowing the pair of heating element support plates 4 and 5 to act as negative electrodes, there is no need for a separate negative electrode plate used in the prior art. In this case, one end of the PTC element 7a is brought into contact with the end of the 'U' curved portion 5a of one of the heating element support plates 5 of the pair of heating element support plates 4 and 5, and the PTC One end of the element of the element 7b is preferably in contact with the end of the 'U' curved portion 4a of the other heating element support plate 4,

As shown in FIG. 2, the positive electrode plate 7c protrudes to the outside of the first case 8 through a through hole (not shown) formed in the first case 8 and is connected to a power source of an automobile. The negative electrode terminal 10 is connected to any one of the plurality of heat dissipation fins 3 and protrudes through the through hole of the first case 8 or the second case 9. Current can be supplied to the heat generating element 7 by connecting to.

In general, the pair of PTC elements 7a and 7b are semiconductor ceramic elements having a constant temperature characteristic, and the heat generation performance depends on the degree of adhesion to the electrode plate 7c. Accordingly, in the present invention, the pair of PTC elements 7a and 7b are disposed between the pair of heating element support plates 4 and 5 forming a sealed structure so that the pair of PTC elements 7a and 7b exhibit the maximum heat generating performance. The pair of heating element support plates 4 and 5 and the pair of PTC elements 7a and 7b are brought into close contact with each other by the pressing force of the second support frames 1 and 2, and thus, the pair of PTC elements ( 7a and 7b were to be in close contact with the electrode plate 7c.

Furthermore, when the pair of heating element support plates 4 and 5 are in close contact with the pair of PTC elements 7a and 7b by the first and second support frames 1 and 2 as described above, the pair of heating elements are supported. The U-shaped curved portions 4a and 5a respectively formed on the plates 4 and 5 serve as elastic spring members, so that the straight portions 4ab 5b of the corresponding heating element support plates 4 and 5 are formed. While being in close contact with each other, the sealing property of the pair of heating element support plates 4 and 5 is ensured, and the adhesion between components of the heating element 7 installed inside the pair of heating element support plates 4 and 5 is improved.

Thus, in the present invention, there is no need for a spring member that is separately installed for the adhesion of the heat dissipation core as in the prior art, there is an advantage that can reduce the number of parts and assembly labor.

In addition, the conventional heat transfer heater has a problem that, due to the heating element is exposed to the outside is broken or separated by external force, foreign matters invade from the outside to cause an electrical accident, in the present invention, the heating element (7) ) Is installed inside the pair of heating element support plates 4 and 5 to be sealed to the outside, thereby preventing any impact or intrusion of foreign matters from the outside, thereby increasing safety and reliability of components.

In addition, in order to further improve the sealing property of the pair of heating element support plates 4 and 5, an adhesive 11 may be applied between the ends where the pair of heating element support plates 4 and 5 are in contact with each other.

On the other hand, in order to protect the heating element, a pair of heating element support plates sealed from the outside may be formed in the structure illustrated in FIG.

In Fig. 4, since the structures of both ends of the pair of heating element support plates are the same, only the structure of one end thereof is shown here for convenience.                     

First, as shown in Fig. 4 (a), the pair of heating element support plates 14 and 24 provided between the heat dissipation fins 3 respectively have 'U' curved portions 14a and 15a at their respective ends. The center portion is formed of a straight portion along the longitudinal direction of the heat dissipation fin 3. Inside the pair of heating element support plates 14 and 24 having such a structure, the components of the heating element 7 as described above are provided, and each end of each of the pair of PTC elements 7a and 7b has a heating element support plate ( 14 and 15 are disposed in the curved portions 14a and 15a, and the electrode plate 7c is installed so as to be close to the ends where the curved portions 14a and 15a of the pair of heating element support plates 14 and 15 come into contact with each other. do. At this time, the electrode plate 7c is formed shorter than the length of the pair of PTC elements 7a and 7b.

In addition, as shown in Figure 4 (b), the pair of heating element support plates (24, 25), 'U' curved portion (24a, 25a) formed in close proximity to the heat dissipation fins (3) at both ends, respectively, It has two 'U' curved portion consisting of the 'U' curved portion (24b, 25b) extending from the 'U' curved portion (24a, 25a) formed in the opposite direction, the center portion of the heat radiation fin (3) It is formed of a straight portion along the longitudinal direction of the. Inside the pair of heating element support plates 24 and 25 having such a structure, components of the heating element 7 are provided as in Fig. 4 (a), but a part of both ends of the pair of PTC elements 7a and 7b are provided. Is disposed in contact with a portion of each of the 'U' curved portions 24b and 25b, and the electrode plate 7c is disposed so as not to be in contact with the 'U' curved portions 24b and 25b.

In the case of Figs. 4A and 4B, between the end where the electrode plate 7c and the heating element supporting plates 14 and 15 are in contact, or between the electrode plate 7c and the heating element supporting plate. It is preferable to provide an insulator 16 between the ends where the 24 and 25 are in contact with each other to prevent an electrical short.

The pair of heating element support plates 4, 5; 14, 15; 24, 25 including the heating element 7 in the sealed inner space may not only protect the heating element 7 from external impurities. In addition, since the heat generated from the PTC elements 7a and 7b of the heat generating element 7 also acts as a passage through which heat can be transferred, the amount of heat generated from the heat generating element 7 is increased and the pair of heat generating element support plates from the heat generating element 7 ( Heat transfer efficiency to 4, 5; 14, 15; 24, 25) is improved.

That is, when power is applied through the positive electrode plate 7c and the negative electrode terminal 10 in a state in which each component is in close contact as described above, the heat generated by the pair of PTC elements 7a and 7b is increased. Since the heat transfer plate 4 is directly transferred to the heat dissipation fin 3 side, the heat resistance is reduced to increase the heat transfer efficiency.

On the other hand, the heating element (7), as shown in Figure 3, can be installed in a plurality of (five in the figure for convenience), the number is determined in consideration of the heating capacity and performance of the vehicle. If necessary, instead of the heat radiating fin support plate 6, only a pair of heat generating element support plates 4 and 5 having the heat generating element 7 therebetween may be provided between the heat radiating fins 3.

The plurality of heating elements 7 are electrically connected in parallel, and are energized through a relay switch provided in the vehicle, and the relay switch is independently opened and closed controlled by a control unit.                     

As such, when the electric heaters in which the plurality of heating elements 7 are installed are mounted on a vehicle, a situation in which the capacity of the electric heaters must be limited due to the problem that the capacity of the generator and the battery of the vehicle is limited.

For example, in some cases, only the heat generating element 7 provided in some heat generating body support plates 4 and 5 of the some heat generating body support plates 4 and 5 may be heated.

Even if only a part of the heating element 7 operates as described above, according to the heat transfer heater according to the present invention, since the heat radiating fins 3 and the heating element support plates 4 and 5 are thermally connected by brazing bonding, the heating element 7 The heat generated from the heat is transferred to the other heating element supporting plate side through the heat radiating fins 3 adjacent to the heating element supporting plates 4 and 5 in which the heat generating element 7 is built, and then spreads to all parts of the heater, thereby providing a conventional heat transfer. The heat transfer efficiency is higher than that of the heater.

As described above, according to the electrothermal heater according to the present invention, the heating element is installed inside the pair of heating element support plates to electrically and mechanically protect it from the outside, thereby reliably preventing breakage and detachment due to external force and intrusion of external impurities. Of course, it is possible to prevent accidents and fires caused by electrical short circuit.

In addition, when the heat dissipation core is installed and assembled between a pair of opposing support frames, the 'U' curved portion formed on at least one end of each heating element support plate can be brought into close contact with the components of the heating element while elastically acting. As in the prior art, a separate elastic member is not required, thereby reducing the number of parts and the number of assembly operations as a whole, thereby improving productivity.

In addition, according to the present invention, since a pair of heat generating element support plates in which the heat dissipation fins and the heat generating element are integrated are thermally transferred by brazing bonding, even if only the heat generating element in some of the heat generating element support plates is operated for capacity adjustment, the heat generated from the heat generating element is retained. By spreading to all parts of the heater, it is possible to maximize the heat transfer efficiency.

Although the present invention has been described with respect to the preferred embodiment, the present invention is not limited thereto, and various modifications and applications will be possible to those skilled in the art without departing from the gist of the present invention.

Claims (8)

First and second support frames 1 and 2 facing each other; A plurality of heat dissipation fins 3 disposed at predetermined intervals to facilitate heat transfer between the first and second support frames 1 and 2; At least one curved portion 4a, 5a; 14a, 15a; 24a, 24b disposed at intervals between the plurality of radiating fins 3, respectively, and at least one of the radiating fin support plates 6 provided at intervals from each other. 25a, 25b and straight portions extending from the curved portions 4a, 5a; 14a, 15a; 24a, 24b; 25a, 25b; and the curved portions 4a, 5a; 14a, 15a; 24a, 24b; A pair of heating element support plates 4, 5; 14, 15; 24, 25 which are elastically in close contact with each other by 25a, 25b); Surrounded by the pair of heating element support plates (4, 5; 14, 15; 24, 25) and installed inside the pair of heating element support plates (4, 5; 14, 15; 24, 25) to be sealed from the outside And a pair of PTC elements 7a and 7b provided to face each heating element support plate so as to generate heat by electricity supplied from the outside, and an electrode plate 7c interposed between the pair of PTC elements 7a and 7b. A heating element 7 including); First and second cases (8, 9) coupled to both ends of the first and second support frame, Both ends of the pair of heating element support plates 4, 5; 14, 15; 24, 25 are in contact with each other, and an adhesive 11 is applied to improve the sealing property from the outside. heater. The method of claim 1, The heat dissipation fin 3, the pair of heating element support plates 4, 5; 14, 15; 24, 25, and the heat dissipation fin support plate 6 are brazed to form an integral heat dissipation core. Electric Heater for Automotive Air Conditioning System. The method of claim 1, The electrode plate 7c has a positive polarity so that electricity having different polarities is applied to the pair of heating element support plates 4, 5; 14, 15; 24, 25 and the electrode plate 7c. Electric heater for an automotive air conditioning apparatus, characterized in that. The method of claim 1, The pair of heating element support plates 4 and 5 are asymmetrical structures, each of which has a straight line extending from one 'U' curved portion 4a and 5a and the 'U' curved portion 4a and 5a at one end thereof. And the straight portions 4b and 5b of the heating element support plates 4 and 5 which have the portions 4b and 5b and which the 'U' curved portions 4a and 5a of the respective heating element support plates 4 and 5 face. One end of the PTC element 7a is in contact with the end of the curved portion 5a of one of the pairs of heating element support plates 4 and 5, and the PTC element 7b One end of the heat transfer heater for a vehicle air conditioner, characterized in that the contact with the other end of the curved portion (4a) of the heating element support plate (4). The method of claim 1, The pair of heating element support plates 14 and 15 have a symmetrical structure and extend from one 'U' curved portion 14a and 15a at both ends and the 'U' curved portion 14a and 15a at both ends, respectively. Each of the two ends of the pair of PTC elements 7a and 7b is disposed in the 'U' curved portions 14a and 15a of the heating element support plates 14 and 15, respectively, and the electrode plate 7c is Electric heat heater for a vehicle air conditioner, characterized in that arranged in close proximity to the end that each curved portion (14a, 15a) of the pair of heating element support plates (14, 15) contact. The method of claim 1, The pair of heating element support plates 24 and 25 are symmetrical structures, each having a 'U' curved portion 24a and 25a and a 'U' curved portion 24a which are formed at both ends thereof in proximity to the heat dissipation fin 3 side. , 'U' curved portion 24b, 25b extending from 25a and formed in a direction opposite to the 'U' curved portion 24a, 25a, and having a 'U' curved portion close to the heat dissipation fin 3; 24a and 25a are connected to a straight portion along the longitudinal direction of the heat dissipation fin 3, and a portion of each of both ends of the pair of PTC elements 7a and 7b is a 'U' curved line formed close to the heat dissipation fin 3; An electric heater for an automotive air conditioner, characterized in that it is arranged to be in contact with a portion of each of the 'U' curved portions (24b, 25b) opposite to the portion (24a, 25a). delete The method according to any one of claims 1 to 6, An electric heater for an automotive air conditioner, characterized in that an insulator (16) is provided between the electrode plate (7c) and the end where the heating element support plates (14, 15; 24, 25) contact each other.

Images