JP2009110678A - Electrical heater apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical heater apparatus ensuring contact pressure between a tube and an ohmic heat-generating element and heat transfer performance between the tube and a fin with no use of an energizing member to improve heat generating performance of the ohmic heat-generating element, by pressure-forming the tube after brazing the fin thereto to ensure the contact pressure between the tube and the ohmic heat-generating element without overloading the ohmic heat-generating element. <P>SOLUTION: The electrical heater apparatus has the fin 12 brazed to a body upper wall 111 and a body lower wall 112 of the tube 11, an insertion unit 20 having the ohmic heat-generating element 22 pressure-welded to the body lower wall 112 and an edge part 114 projected in the width direction from a body vertical wall 113 of the tube to form an edge space 11b. The edge space 11b is formed so as to be continuous with the insertion space 11a and is smaller in thickness dimension than the thickness dimension of the insertion unit 20. The edge part 114 has an edge part upper wall 114a, an edge part lower wall 114b and an edge part vertical wall 114c disposed in a concave shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric heater device including an energization heating element that generates heat when energized, called a PTC (Positive Temperature Coefficient) element.

  Conventionally, an electric heater device in which a plurality of PTC elements that generate heat when energized and fins that dissipate the heat generated by the PTC elements are stacked is known, for example, in Patent Document 1.

Moreover, as such an electric heater device, a structure in which an energization heating element and an electrode plate and an insulating plate are sequentially stacked are accommodated in a conductive tube, and a fin is pressed or bonded to the outer surface of the tube. Things are known.
In such an electric heater device, the energization heating element can be energized to generate heat by connecting the electrode plate and the fins or tubes to the plus side and the minus side of the power source, respectively.
JP-A-5-169967

In the conventional technology as described above, when the contact pressure with respect to the electrode plate and the tube is lower than the set pressure, the heat generating element such as the PTC element does not generate heat and heat smoothly and has a sufficient heat generation amount. I can't get it. That is, when the contact pressure between the energization heating element and the tube is low, the heat generated by the energization heating element is not smoothly transferred to the tube. In this case, the temperature of the energization heating element itself becomes high and the resistance value is high. Therefore, energization and heat generation are not smoothly performed.
Therefore, when an urging member such as a spring that secures the contact pressure between the energization heating element and the tube is set, the number of parts increases, resulting in an increase in cost and weight.

  On the other hand, to secure the contact pressure between the tube and the energization heating element, it is conceivable to press the tube, but in this case, do not apply an overload to prevent the energization heating element housed inside from being damaged. It is difficult to press. In addition, when both end edges of the tube are pressed so as not to pressurize the energization heating element, the upper wall and the lower wall of the tube may be deformed so that the desired contact pressure may not be obtained.

In addition, when performing press processing of the tube, if the fin cannot be brazed to the tube in the previous step of the press processing and the fin is brazed after the energization heating element is inserted into the tube The energization heating element is damaged by the heat of brazing.
Therefore, the fin comes into contact with or adheres to the tube without brazing, but in this way, when the fin and the tube are brought into contact with or adhered, compared with the brazed one, the fin is moved from the tube to the fin. The heat transferability is inferior and the heat generation performance is reduced.
Thus, conventionally, without using an urging member, the contact pressure between the tube and the energization heating element is ensured, and the heat transfer performance from the tube to the fin is ensured, so that the energization heating element has sufficient heat generation performance. It was difficult to get.

  The present invention has been made by paying attention to the above-described conventional problems. The tube is pressed after brazing the fins, so that the tube and the heating element can be connected to each other without overloading the heating element. It is possible to ensure the contact pressure, thereby ensuring the contact pressure between the tube and the heating element and the heat transfer performance between the tube and the fin without using a biasing member. An object of the present invention is to provide an electric heater device that can improve the heat generation performance of the energization heating element at low cost.

  In order to achieve the above-mentioned object, the invention according to claim 1 is formed in a long thin plate shape, and is continuous with the body upper wall and the body lower wall facing each other in the thickness direction, and both ends of the body upper and lower walls in the width direction. A cylindrical tube having an insertion space with a substantially rectangular cross-sectional shape surrounded by a pair of main body vertical walls opposed to each other in the width direction, and at least the main body upper wall and the main body lower wall of the tube Fins brazed to one outer surface, an energizing heating element inserted into the insertion space and pressed against one of the main body upper wall and the main body lower wall, and an electrode member in contact with the energizing heating element An insertion unit formed by stacking an insulator interposed between the electrode member and the other wall, and projecting in the width direction from both vertical walls of the main body of the tube, and continuing to the insertion space More than the thickness dimension of the insertion unit An ear part having an ear upper wall, an ear lower wall, and an ear vertical wall arranged in a substantially concave shape so as to form an ear part space having a thickness dimension of a small size. A heater device was used.

  The invention according to claim 2 is the electric heater device according to claim 1, characterized in that the ear part space extends to the outside in the width direction from the main body vertical wall of the tube. It was set as the electric heater apparatus.

  According to a third aspect of the present invention, in the electric heater device according to the first or second aspect, the width direction dimensions of the main body upper wall and the main body lower wall of the tube are equal to the width direction dimension of the fin. It was set as the electric heater device characterized by having done.

  According to a fourth aspect of the present invention, in the electric heater device according to any one of the first to third aspects, the energization heating element, the electrode member, and the insulator are formed in a thin plate shape. The insertion unit has a holding hole for holding the energization heating element, the electrode member, and the insulator in a state of being stacked in the thickness direction, and is formed in a frame shape surrounding the holding hole. The electric heater device is characterized in that a holding frame is included, and a chamfered portion is formed on the outer periphery of the holding frame by cutting off corners.

The electric heater device of the present invention can be manufactured by the following procedure.
That is, fins are brazed to the tube in advance.
Next, the insertion unit in which the energization heating element, the electrode member, and the insulator are overlapped is inserted into the tube insertion space.
At the time of this insertion, the thickness direction dimension of the ear part space is formed smaller than the thickness direction dimension of the insertion unit. Therefore, the insertion unit is arranged in the insertion space without being inserted into the ear part space. The
Next, by pressing the ear from the thickness direction and deforming in the thickness direction, a load is applied to the upper wall of the tube and the lower wall of the tube in the direction of the insertion space, and the desired contact with the insertion unit. Pressure can be obtained.
Therefore, without using an urging member such as a spring, it is possible to ensure a contact pressure between the energization heating element and one of the main body upper wall and the main body lower wall that contacts the energization heating element.
At this time, since there is no insertion unit in the ear space, it is possible to prevent the energization heating element from being damaged due to an input of an overload during the press working.

In the electric heater device manufactured in this way, since the tube and the fin are brazed, the heat transfer efficiency from the tube to the fin is improved as compared with the case where the tube and the fin are simply in contact with each other. Can do.
Therefore, the heat generated by the energization heating element can be smoothly radiated, and the heat generation performance of the heat generating device can be improved.
In addition, since a high contact pressure between the energization heating element and the tube can be obtained, the heat generated by the energization heating element can be smoothly transferred to the tube, and heat generation can be performed while suppressing an increase in the resistance value of the energization heating element. Can be made smoothly, and the heat generation performance can be improved.
In addition, since an urging member that secures the contact pressure between the tube and the energization heating element is unnecessary, the number of parts can be reduced, and the cost and weight can be reduced.

  In addition, since the ears are provided on the tube, it is easy to transform the deformation in the thickness direction of the ears into a bending deformation in the insertion space direction of the upper wall and lower wall of the tube during press processing. The contact pressure can be obtained more reliably than when the space portion is pressed.

  In addition, since only the ears can be pressed during press processing, press processing is possible even if fins are brazed to the upper wall and lower wall of the tube in advance, and heat is applied by the heat generated during brazing. The body can be prevented from being damaged. In addition, it is possible to prevent the insertion unit from being pressed during pressing, and it is possible to prevent the energization heating element from being damaged by the load during pressing.

As described above, in the present invention, it is possible to prevent an overload from being applied to the energization heating element in the press working after the brazing of the fin, so that the tube and the energization heating element can be used without using an urging member. Provides an electric heater device that can ensure the heat transfer performance between the tube and fins and the contact pressure between the heating element and the tube, and can improve the heating performance of the heating element at low cost. can do.
And since it is the structure which inserted the insertion unit in the tube, compared with forming a tube by combining several members at the time of manufacture, manufacture is easy.

Furthermore, in the invention according to claim 2, since the ear part space extends to the outside in the width direction from the main body vertical wall of the tube, when the ear part is pressed, the thickness direction of the ear part is obtained. The deformation allowance of the main body upper wall and the main body lower wall can be increased in the insertion space direction, and the contact pressure between the tube and the heating element can be further ensured.
Therefore, the heat transfer efficiency between the energization heating element and the tube can be ensured, and the heat generation performance can be further improved.

  In the invention according to claim 3, since the width direction dimensions of the main body upper wall and the main body lower wall of the tube coincide with the width direction dimensions of the fin, when the fin is brazed to the tube, Positioning is easy and workability is excellent.

  Further, in the invention according to claim 4, since the chamfered portion is formed on the outer periphery of the holding frame, the main wall and the lower wall of the tube are deformed inward and contact the outer periphery of the holding frame at the time of pressing. In addition, stress concentration can be relaxed, and bending of the main body upper wall and the main body lower wall can be prevented from occurring, and the reliability of obtaining a desired contact pressure can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The electric heater device of this embodiment is formed in a long thin plate shape, and the main body upper wall (111) and the main body lower wall (112) opposed in the thickness direction, and the widths of the main body upper and lower walls (111, 112). A cylindrical tube (11) having a substantially rectangular cross-section insertion space (11a) surrounded by a pair of main body vertical walls (113, 113) formed continuously at both ends in the direction and opposed in the width direction And a fin (12) brazed to at least one outer surface of the main body upper wall (111) and main body lower wall (112) of the tube (11), and inserted into the insertion space (11a), An energization heating element (22) pressed against one of the main body upper wall (111) and the main body lower wall (112), an electrode member (23) in contact with the energization heating element (22), and the electrode member (23) intervened between the other wall The insertion unit (20) formed by overlapping the rim body (24) and the main body vertical walls (113) of the tube (11) protrude in the width direction, and continue to the insertion space (11a). An ear upper wall (114a), an ear lower wall (114b) disposed in a substantially concave shape by forming an ear space (11b) having a thickness dimension smaller than the thickness dimension of the insertion unit (20); And an ear part (114) having an ear part vertical wall (114c).

  Below, based on FIGS. 1-7, the electric heater apparatus A of Example 1 of the best embodiment of this invention is demonstrated.

The electric heater device A according to the first embodiment is used, for example, for heating air in a vehicle air conditioning unit (not shown).
In this electric heater device A, heat generating units 1 to be described later are stacked in three layers in the vertical direction, and the upper and lower sides thereof are sandwiched between end plates 2 and 2, and both longitudinal ends thereof are connected to the front housing 3 and the end housing. 4 and is fixedly formed.

  The front housing 3 and the end housing 4 are formed of a material excellent in electrical insulation and heat resistance, for example, fiber reinforced PBT (Polybutylene terephthalate). This fiber reinforced PBT has excellent dimensional stability due to its low water absorption coefficient and thermal expansion coefficient, and also has excellent electrical insulation properties, small changes in electrical properties due to moisture absorption, and high dielectric breakdown voltage. is doing.

  As shown in FIG. 3, the heat generating unit 1 includes a tube 11, fins 12 and 12, and an insertion unit 20. In addition, the insertion unit 20 includes a holding frame 21, energization heating elements 22, 22, 22, 22, an electrode plate 23, and an insulating plate 24.

  The tube 11 is formed in a substantially rectangular cylindrical shape surrounding the insertion space 11a by extrusion molding or the like with a metal having excellent thermal conductivity (for example, a plate made of aluminum or aluminum alloy). Details of this shape will be described later.

  The fins 12 are formed in a corrugated shape from a metal plate material (for example, a plate material made of aluminum or aluminum alloy) having excellent thermal conductivity, and the main body upper walls 111 on both sides in the thickness direction of the tube 11 (the arrow UD direction in the figure). The main body lower wall 112 is brazed.

  The holding frame 21 is configured by arranging a plurality (four in the first embodiment) of energization heating elements 22, 22, 22, 22 side by side in the longitudinal direction (arrow LR direction) at a predetermined interval. It is formed in a substantially rectangular frame shape surrounding the rectangular holding hole 21a with a material excellent in property (for example, polyamide).

The energization heating element 22 is made of a semiconductor ceramic whose main component is barium titanate (BaTiO3), generally called PTC (Positive Temperature Coefficient), and has a characteristic of generating heat when energized. In the first embodiment, the energization heating element 22 is formed in a substantially rectangular thin plate shape, and is fitted in the holding hole 21a of the holding frame 21 in a state of being aligned in the longitudinal direction (arrow LR direction). Held.
The electrode plate 23 is a rectangular thin plate-like plate as shown in the figure, and has conductivity. Further, a connection terminal portion 23a for connector connection (not shown) is formed at one end of the electrode plate 23 by bending.

The insulating plate 24 is formed in a rectangular thin plate shape with an insulating resin or the like. The electrode plate 23 and the insulating plate 24 are also formed with a width that fits in the holding hole 21a of the holding frame 21 together with the energization heating element 22, and as shown in FIG. 6, the energization heating element 22, the electrode plate 23, The dimension in the thickness direction in a state where the insulating plate 24 is overlapped is formed to be slightly larger than the dimension in the thickness direction of the holding frame 21.
Further, the outer peripheral corners of the holding frame 21 are chamfered to form chamfered portions 21b, 21b, 21b, 21b as shown in the figure.

  The insertion unit 20 that holds the energization heating element 22, the electrode plate 23, and the insulating plate 24 in the holding hole 21 a is inserted into the insertion space 11 a of the tube 11.

Here, the detail of the shape of the tube 11 is demonstrated based on FIG. 5 and FIG.
The tube 11 has a main body upper wall 111 and a main body lower wall 112 facing each other in the thickness direction (arrow UD direction) of the tube 11, and both ends of the main body upper wall 111 and the main body lower wall 112 in the width direction (arrow W direction). It is formed in a cylindrical shape provided with a substantially rectangular cylindrical insertion space 11a surrounded by a pair of main body vertical walls 113, 113 that are formed integrally and continuously in the width direction.

  And the ear | edge part 114 is integrally formed so that it protrudes from the both main body vertical walls 113 to the outer side of the width direction.

  The ear part 114 is formed in a substantially concave shape in cross section by an ear part upper wall 114a and an ear part lower wall 114b opposed to each other in the thickness direction, and an ear part vertical wall 114c standing in the thickness direction. An ear part space 11b is formed.

  Further, the distance in the thickness direction between the ear upper wall 114a and the ear lower wall 114b is formed to be narrower than the distance in the thickness direction between the main body upper wall 111 and the main body lower wall 112, and the thickness of the ear space 11b. The direction dimension is formed to be smaller than the thickness direction dimension of the insertion unit 20.

  Further, the ear vertical wall 114 c is disposed with the inner side surface positioned outside the outer side surface position of the main body vertical wall 113, and the ear space 11 b extends to the outer side in the width direction than the main body vertical wall 113. Be present.

As described above, the tube 11 is surrounded by the substantially rectangular insertion space 11 a surrounded by the main body upper wall 111, the main body lower wall 112, and the main body vertical walls 113, 113, and the ear portion 114. And an ear space 11b extending outward in the width direction from the main body vertical wall 113 continuously in the width direction of the space 11a.
As shown in FIG. 1, the width direction dimensions of the main body upper wall 111 and the main body lower wall 112 are the same as the width direction dimensions of the fins 12.
Further, in the first embodiment, the main body upper wall 111 and the main body lower wall 112 of the tube 11 are pressed against the insertion unit 20, and the main body lower wall 112 is pressed against the energizing heating element 22 as shown in the figure. Has been.

  The press contact between the insertion unit 20 and the main body upper wall 111 and the main body lower wall 112 is performed by pressing the ear portion 114, and the procedure will be described below.

  In the press working, as shown in FIG. 5, the ear portion 114 is pressed from above and below by the pressing jig 30. As shown in the figure, the pressing jig 30 includes a pair of pressing members 31 and 31 that sandwich the upper ear wall 114a and the lower ear wall 114b from above and below. The pressing member 31 includes an inclined pressing surface 31a that is inclined so that the ear upper wall 114a and the ear lower wall 114b can be deformed inward as the distance from the ear vertical wall 114c increases.

Therefore, when the ears 114 are pressed by the pressing members 31 and 31 as shown in the figure, the positions where the ear upper wall 114a and the ear lower wall 114b are separated from the ear vertical wall 114c are deformed inward in the ear space 11b. To do. And with this deformation, the corners of the main body vertical wall 113 and the main body upper wall 111 and the main body lower wall 112 are displaced inward in the width direction of the tube 11 as indicated by an arrow H1 in the drawing.
By the deformation of the main body vertical wall 113, the main body upper wall 111 and the main body lower wall 112 are deformed in the inner direction of the insertion space 11a, which is the direction indicated by the arrow H2, in the width direction center.
Incidentally, in order to cause such deformation, it is necessary that the pressing portion by the pressing member 31 is inside the inner side surface of the ear vertical wall 114c.

As a result, as shown in FIG. 6, the main body upper wall 111 and the main body lower wall 112 are each subjected to a load F on the insertion unit 20, and the main body lower wall 112 is in a desired state with respect to the energization heating element 22. Contact pressure is obtained.
Here, a desired contact pressure, in the first embodiment, as shown in FIG. 7, greater than 0.5 N / mm ^2, preferably a value greater than 1.1 N / mm ^2, the energization The contact pressure is set to a value significantly lower than the limit contact pressure GN / mm ² at which the heating element 22 is destroyed, and this contact pressure can be adjusted by the deformation amount of the ear portion 114.
Incidentally, FIG. 7 is an input characteristic diagram showing the relationship between the contact pressure between the energization heating element 22 and the tube 11 and the input (W) at the time of energization. It can be seen that the desired heat generation performance can be obtained in the vicinity of 5 N / mm ² or more.

Therefore, in the electric heater device A of the first embodiment, since a desired contact pressure is obtained between the tube 11 and the energization heating element 22, the heat generation of the energization heating element 22 occurs during energization. 11, the desired heat transfer performance is obtained and efficient heat generation is possible.
Further, since a desired contact pressure between the tube 11 and the energization heating element 22 is obtained by pressing the ear portion 114 of the tube 11, a spring that urges the energization heating element 22 in the insertion space 11 a of the tube 11. The number of parts can be reduced and the cost and weight can be reduced compared with the provision of the above.

  In addition, since the fins 12 and 12 are brazed to the tube 11, the heat transfer performance between the tube 11 and the fins 12 is also improved as compared with the case where the fin 12 is simply in contact with the tube 11. High and efficient heat generation is possible.

In addition, since the ear portion 114 of the tube 11 is pressed, the pressing can be performed even if the fin 12 is brazed to the main body upper wall 111 and the main body lower wall 112 of the tube 11.
Therefore, brazing before inserting the energization heating element 22 is possible, and the energization heating element 22 is not destroyed by heat during brazing.

  Further, in the first embodiment, since the ear space 11b is formed to have a size smaller than the thickness of the insertion unit 20, when the insertion unit 20 is inserted into the insertion space 11a, the insertion unit 20 11b is not inserted. Therefore, it is possible to reliably position the insertion unit 20 in the insertion space 11a where no press load is input during the pressing process, and it is ensured that the energization heating element 22 is destroyed by the overload during the pressing process. Can be prevented.

  As described above, in the first embodiment, it is possible to perform the press working after the fin 12 is brazed, and it is possible to prevent the energization heating element 22 from being overloaded in the press working, and the biasing member is used. The contact pressure between the tube 11 and the energization heating element 22 can be ensured without any problems, the number of parts can be reduced, and the heat transfer performance between the tube 11 and the fin 12 can be ensured, and the energization heating element 22 and the tube 11 can be secured. It is possible to provide the electric heater device A that can satisfy the requirements of ensuring the heat generation performance of the energization heating element 22 by ensuring the contact pressure.

In addition, since the ear part space 11b extends to the outside in the width direction from the main body vertical wall 113 of the tube 11, when the ear part 114 is pressed, a deformation allowance in the thickness direction of the ear part 114 is obtained. Therefore, the amount of deformation of the main body upper wall 111 and the main body lower wall 112 in the direction of the insertion space 11a can be increased, and the contact pressure between the tube 11 and the energization heating element 22 can be further ensured. .
Therefore, the heat transfer efficiency between the energization heating element 22 and the tube 11 can be secured, and the heat generation performance can be further improved.

Further, in the first embodiment, the inclined pressing surface 31a is formed on the pressing member 31 of the pressing jig 30, so that the main body vertical wall 113 falls inward compared to pressing the ear portion 114 with the horizontal pressing surface. Thus, the ear upper wall 114a and the ear lower wall 114b can be reliably deformed.
Therefore, the main body upper wall 111 and the main body lower wall 112 can be brought into contact with the insertion unit 20 with a desired contact pressure, that is, the energization heating element 22 and the main body lower wall 112 are brought into contact with each other with a desired contact pressure. The desired heat generation performance can be obtained with certainty.

  Furthermore, since the first embodiment has a structure in which the insertion unit 20 is inserted into the tube 11, it is easier to manufacture compared to forming a tube by combining a plurality of members at the time of manufacturing.

Further, in the first embodiment, since the width direction dimensions of the main body upper wall 111 and the main body lower wall 112 of the tube 11 coincide with the width direction dimensions of the fin 12, when the fin 12 is brazed to the tube 11. The fin 12 can be positioned by making both sides of the fin 12 in the width direction coincide with both sides of the walls 111 and 112 in the width direction.
Therefore, the positioning of the fins 12 is easy and the workability is excellent.

  Further, in the first embodiment, since the chamfered portion 21b is formed on the outer periphery of the holding frame 21, the main body upper wall 111 and the main body lower wall 112 of the tube 11 are deformed inward during the press working, so that the outer periphery of the holding frame 21 When contacted, the concentration of stress can be alleviated, and bending of the main body upper wall 111 and the main body lower wall 112 can be prevented, and the certainty of obtaining a desired contact pressure can be improved.

  In addition, in the first embodiment, since the electrode plate 23 is inserted into the tube 11, a structure having no potential difference is obtained on the outer surface of the electric heater device A. For this reason, even if the foreign material which has electroconductivity contacts the surface of the electric heater apparatus A, there is no possibility of short-circuiting.

  Further, the energization heating element 22 is inserted into the tube 11 so that the energization heating element 22 is not directly exposed to the outside air, performance deterioration due to corrosion of the energization heating element 22 is suppressed, and durability can be improved. .

  As mentioned above, although embodiment and Example 1 of this invention were explained in full detail with reference to drawings, specific structure is not restricted to this Embodiment and Example 1, and does not deviate from the summary of this invention. A degree of design change is included in the present invention.

  For example, in Example 1, although demonstrated as what is applied to the air conditioner for vehicles, it is not limited to this, It can apply also to industrial equipment other than a household appliance or a vehicle.

  Moreover, in Example 1, although the example which laminated | stacked the heat generating unit 1 on the 3 steps | paragraph was shown, it is not limited to this, What is necessary is just to have the heat generating unit 1 or more.

  Moreover, in Example 1, although the example which brazed the fin 12 to both the main body upper wall 111 and the main body lower wall 112 of the tube 11 was shown, the fin brazed to at least one of both the walls 111 and 112, These may be laminated.

It is sectional drawing which shows the heat generating unit 1 used for the electric heater apparatus A of Example 1 of the best embodiment of this invention, Comprising: The state cut | disconnected by the S1-S1 line | wire of FIG. 4 is shown. It is a perspective view which shows the electric heater apparatus A of Example 1. FIG. 1 is an exploded perspective view showing a heat generating unit 1 used in an electric heater device A of Example 1. FIG. It is a side view which shows the heat generating unit 1 used for the electric heater apparatus A of Example 1. FIG. It is explanatory drawing explaining the deformation | transformation at the time of the press work of the tube 11 used for the electric heater apparatus A of Example 1. FIG. It is explanatory drawing of the contact state of the tube 11 and the insertion unit 20 in the electric heater apparatus A of Example 1. FIG. It is an input characteristic figure which shows the relationship between the contact pressure of the electricity heating element 22 and the tube 11 in the electric heater apparatus A of Example 1, and the input (W) at the time of electricity supply.

Explanation of symbols

11 Tube 11a Insertion space 11b Ear part space 12 Fin 20 Insertion unit 21 Holding frame 21a Holding hole 21b Chamfering part 22 Electric heating element 23 Electrode plate 23a Connection terminal part 24 Insulating plate 111 Main body upper wall 112 Main body lower wall 113 Main body vertical wall 114 Ear 114a Ear upper wall 114b Ear lower wall 114c Ear vertical wall

Claims (4)

A main body upper wall and a main body lower wall that are formed in a long thin plate shape and are opposed to each other in the thickness direction, a pair of main body vertical walls that are formed continuously at both ends in the width direction of the main body upper and lower walls, and are opposed in the width direction, A cylindrical tube having an insertion space of a substantially rectangular cross-section surrounded by,
Fins brazed to at least one outer surface of the main body upper wall and the main body lower wall of the tube;
An energization heating element inserted into the insertion space and pressed against one of the main body upper wall and the main body lower wall, an electrode member in contact with the energization heating element, and between the electrode member and the other wall An insertion unit formed by stacking insulators interposed between,
The tube protrudes in the width direction from the vertical walls of both main bodies of the tube, is continuous with the insertion space, and is arranged in a substantially concave shape by forming an ear space having a thickness direction dimension smaller than the thickness direction dimension of the insertion unit. An ear portion having an ear upper wall, an ear lower wall, and an ear vertical wall;
An electric heater device comprising:   2. The electric heater device according to claim 1, wherein the ear part space extends to the outside in the width direction with respect to the main body vertical wall of the tube.   The electric heater device according to claim 1 or 2, wherein a width direction dimension of the main body upper wall and the main body lower wall of the tube is equal to a width direction dimension of the fin. The energization heating element, the electrode member and the insulator are formed in a thin plate shape,
The insertion unit has a holding hole for holding the energization heating element, the electrode member, and the insulator in a state of being stacked in the thickness direction, and a holding frame formed in a frame shape surrounding the holding hole Contains
The electric heater device according to any one of claims 1 to 3, wherein a chamfered portion having a corner portion cut off is formed on an outer periphery of the holding frame.

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