JP2006120559A - Ceramic heater, heat exchange unit and manufacturing method of ceramic heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost ceramic heater facilitating jointing work, having high joint strength, and obviating the need of design change or the like of a structure around a mating member or the like; to provide a heat exchange unit using the ceramic heater; and to provide a manufacturing method of the ceramic heater. <P>SOLUTION: The shape of the cross-sectional surface (that is, a cross-sectional surface along a center axis of a through-hole 17) of a chamfering part 21 is round. Thereby, in the space (introduction opening 23) on the opening end side of the through-hole 17, the opening area on the rear end side (opening end side) rapidly increases as compared with the tip side by virtue of the structure of the chamfering part 21. That is to say, the surface shape of the chamfering part 21 is formed into a shape projecting outward by a curved surface (having a round cross-sectional surface). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ceramic heater, a heat exchange unit, and a method for manufacturing a ceramic heater used in, for example, a warm water washing toilet seat, an electric water heater, a 24-hour bath, and the like.

  Conventionally, for example, a warm water washing toilet seat has been used with a heat exchanger having a resin casing in order to warm the washing water. A long pipe-shaped ceramic heater is attached to the heat exchanger. It has been.

  The ceramic heater is obtained by winding a sheet-shaped ceramic heater with a built-in heater around the outer peripheral surface of a pipe-shaped ceramic base, and the center of the shaft is supplied with tap water serving as cleaning water. There is a road.

When manufacturing this kind of ceramic heater, the following method is mentioned, for example.
First, a pipe-like alumina ceramic substrate is formed by temporary firing. On the other hand, a high melting point metal such as tungsten is printed on the surface of the alumina ceramic sheet to form a heater (heater pattern).

  Next, an alumina paste is applied to the ceramic sheet, wound around the outer peripheral surface of the ceramic substrate, bonded, pressurized, and integrally fired. As a result, as shown in FIG. 11A, a ceramic heater body 1005 having a shape in which a sheet-like heater member 1003 is wound around the ceramic base 1001 is obtained.

  Next, a ceramic flange 1007 is externally fitted to the rear end side (the upper side in the figure) of the ceramic heater body 1005. That is, the ceramic heater body 1005 is passed through the round hole 1009 provided in the center of the flange 1007, and the flange 1007 is disposed at a predetermined mounting position.

Next, a ring-shaped glass adhesive 1011 is fitted from above the ceramic heater body 1005 and placed on the flange 1007.
Next, by heating and melting the glass adhesive 1011, the flange 1007 is joined to the ceramic heater body 1005 to manufacture the ceramic heater 1013 shown in FIG. ). There is also a method of bonding using an organic adhesive or the like instead of a glass adhesive.
JP 2002-134250 A (FIG. 2, page 3) Utility Model Registration No. 2557220 (FIG. 6, page 3)

  In the prior art described above, the upper surface of the round hole 1009 of the flange 1007 is made easy to allow the molten glass adhesive 1011 to flow between the ceramic heater main body 1005 and the flange 1007 when joining by heating. A C chamfered portion 1015 was provided at the end on the side.

  However, if the C chamfered portion 1015 is enlarged in order to facilitate the flow of the molten glass adhesive 1011, the opening area on the upper surface side of the round hole 1009 increases and the glass adhesive 1011 flows better. There is a problem that the dimension L of the portion where the outer peripheral surface of the heater body 1005 and the inner peripheral surface of the flange 1007 are close to each other (proximity portion 1013: where the respective surfaces are parallel and facing each other) is shortened, resulting in a decrease in bonding strength. It was.

  That is, the inventors' research has shown that in order to increase the bonding strength between the ceramic heater body 1005 and the flange 1007, it is desirable to lengthen the dimension L of the proximity portion 1013. A method of enlarging the chamfered portion 1015 is not necessarily preferable.

  On the other hand, when the C chamfered portion 1015 is made smaller, the dimension L of the proximity portion 1013 becomes longer, but it becomes difficult for the glass adhesive 1011 to flow between the ceramic heater body 1005 and the flange 1007. In this case, the bonding strength also decreases. There was a problem.

  As a countermeasure for this, it is conceivable to increase the thickness of the flange 1007. In that case, however, this leads to an increase in cost, and it is necessary to change the design of a heat exchanger or the like which is a counterpart member to which the ceramic heater 1013 is attached. Absent.

  The present invention has been made in view of these problems, and its purpose is that the joining work is easy, the joining strength is high, and the cost is low, and there is no need to change the design of the surrounding structure such as the mating member. An object of the present invention is to provide a ceramic heater, a heat exchange unit using the ceramic heater, and a method for manufacturing the ceramic heater.

  (1) The invention of claim 1 is a ceramic heater in which a flange having a through hole and a long ceramic heater main body passed through the through hole of the flange are joined by a bonding agent. At least one opening end is provided with a chamfered portion whose opening area is increased on the opening end side, and a part or the entire surface shape of the chamfered portion is formed to be convex outwardly by a curved surface or a plurality of planes. It is characterized by having a convex shape outward.

  In the present invention, the surface shape of a part or the whole of the chamfered portion is formed to be convex outwardly by a curved surface or convex outwardly by a plurality of planes. Therefore, a preferable introduction opening for joining the flange and the ceramic heater body. The shape of the portion (opening formed by the chamfered portion) can be used. Therefore, the joining operation is easy, the joining strength is high, and the cost is low, and there is a remarkable effect that the design change of the counterpart member is unnecessary.

  That is, in the present invention, since the surface shape of the chamfered portion is convex outward as compared with the conventional C chamfer, even if the dimension in the thickness direction of the flange in the chamfered portion is substantially shortened, A sufficient opening area at the opening end can be ensured. Therefore, since the bonding agent can be smoothly introduced into the introduction opening at the time of bonding, the bonding operation is easy.

  Further, as described above, since the dimension in the thickness direction of the flange in the chamfered portion can be substantially shortened, it is possible to sufficiently secure the dimension of the adjacent portion where the outer peripheral surface of the ceramic heater body and the inner peripheral surface of the flange are close to each other. it can. Therefore, sufficient bonding strength can be ensured without increasing the thickness of the flange. Therefore, there is an advantage that the manufacturing cost can be reduced and the design change of the surrounding structure such as the counterpart member is unnecessary.

  Here, the proximity portion includes a range in which the inner peripheral surface of the through hole of the flange and the outer peripheral surface of the ceramic heater body are parallel, but not only that, but the surface of the chamfered portion is curved ( Since the angle changes in the case of multiple stages), the range in which the surface of the chamfered portion is substantially parallel to the surface of the ceramic heater body is also included.

  In other words, the range of the proximity portion includes not only the inner peripheral surface of the through-hole (parallel to the outer peripheral surface of the ceramic heater body) but also a predetermined amount (for example, 0.3 mm or less) in the radial direction with reference to the inner peripheral surface. ) A curved or bent range is mentioned.

  In addition, the fact that the dimension in the thickness direction of the chamfered portion is substantially short means that the substantially parallel portion (for example, a pseudo perfect circle portion to be described later) of the adjacent portions is excluded from the chamfered portion. This shows that the dimension of the chamfered portion is shortened.

  Further, the flange is a member that protrudes to the side of the ceramic heater body (for example, in a bowl shape). In addition, examples of the cross-sectional shape (cross-sectional shape along the penetrating direction of the through hole) of the surface of the chamfered portion include a shape that curves outwardly and a shape that is bent in multiple steps and convex outward.

(2) The invention of claim 2 is characterized in that the ceramic heater body is a cylindrical member.
The present invention exemplifies a preferable shape of the ceramic heater body. In this case, the shape of the through hole of the flange is preferably a circle corresponding to the outer shape of the ceramic heater body (the outer shape in a plane perpendicular to the axis).

(3) In the invention of claim 3, the cross-sectional shape along the penetration direction of the through hole of the flange in the chamfered portion is an R shape (a shape of a circle having a radius r).
The present invention exemplifies a preferable shape of the cross-sectional shape of the chamfered portion. If it is this shape, while being able to ensure sufficient opening area, the dimension (thickness direction dimension of a flange: dimension of a penetration direction) of sufficient proximity | contact part can be ensured.

  (4) In the invention of claim 4, the cross-sectional shape along the penetration direction of the through hole of the flange in the chamfered portion is larger in the radial direction relative to the change in the thickness direction of the flange than the R shape. It is characterized by that.

The present invention exemplifies a preferable shape of the cross-sectional shape of the chamfered portion (see FIG. 9). With this shape, a larger opening area can be secured than in the case of the R shape.
As the cross-sectional shape of the chamfered portion, there is a shape that can be expressed by a predetermined function in which the degree of increase in the opening area is larger than the R shape as it goes from the inner side of the flange to the opening end side. For example, there is a shape in which the degree of increase in the radial dimension (inner diameter) of the cross section increases at a larger increase rate than the linear function of the proportionality constant 1. Specifically, the cross-sectional shape may be a shape indicated by a function such as y = 2logx (y is the thickness direction of the flange, x is the radial direction of the flange). (5) The invention of claim 5 is the chamfered portion. The cross-sectional shape along the penetration direction of the through hole of the flange in FIG. 3 is characterized in that the change in the thickness direction with respect to the change in the radial direction of the flange is larger than the R shape.

  The present invention exemplifies a preferable shape of the cross-sectional shape of the chamfered portion (see FIG. 10), and this shape has an advantage that it is easier to introduce the bonding agent into the proximity portion than the R shape.

The cross-sectional shape of the chamfered portion can be expressed by a function, for example, the y = 2logx line symmetric figure (line symmetric with respect to y = x).
(6) In the invention of claim 6, the dimension in the penetrating direction of the proximity portion adjacent to the ceramic heater body in the through hole of the flange is within a range of 1/10 to 1/2 of the thickness of the flange. It is characterized by.

  If it is this range, high joint strength can be exhibited. Moreover, the range of 4-10 mm is mentioned as a dimension (radius) of the radial direction of the chamfering part in the opening end of a flange. Within this range, the adhesive can be smoothly introduced into the introduction opening.

(7) The invention of claim 7 is characterized in that a heating element is disposed on one end side of the ceramic heater body, and a chamfered portion of the flange is provided on the opposite side of the heating element.
The present invention exemplifies a preferable structure of the ceramic heater body.

  (8) The invention of claim 8 is characterized in that a gap between the outer peripheral surface of the ceramic heater main body and the inner peripheral surface of the through hole of the flange other than the chamfered portion is 0.2 to 2 mm.

  The present invention exemplifies preferred dimensions (dimensions on one side) of the gap between the ceramic heater body and the flange. If it is this range, when both members are combined, it is hard to rattle and can be combined easily, and high joint strength can be realized.

  (9) In the invention of claim 9, a step (for example, a stop step) for preventing the bonding agent from flowing out is provided outside the chamfered portion in the outer peripheral direction on the surface side where the chamfered portion of the flange is provided. It is characterized by that.

In this invention, since the step part which a step becomes high is provided in the outer side of the chamfer part, it can prevent that a bonding agent spreads around a chamfer part.
(10) The invention of claim 10 is characterized in that the flange is made of ceramic and the bonding agent is a glass-based material or a resin adhesive.

The present invention shows preferred examples of flanges and bonding agents.
(11) The invention of claim 11 is characterized in that the flange is made of ceramic or resin, and the bonding agent is a resin adhesive.

The present invention shows preferred examples of flanges and bonding agents.
(12) The invention (heat exchange unit) of claim 12 is characterized in that the ceramic heater according to any one of claims 1 to 11 is attached to a heat exchanger.

In this invention, a heat exchange unit can be comprised by attaching the ceramic heater mentioned above to a heat exchanger.
(13) According to a thirteenth aspect of the present invention, in the ceramic heater manufacturing method according to any one of the first to tenth aspects, the ceramic heater body is erected, and the chamfered portion is formed on the erected ceramic heater body. The flange is externally fitted up, a bonding agent mainly composed of glass is disposed on the upper surface of the flange, and the bonding agent is softened by heating at a predetermined temperature, and the bonding agent is removed from the chamfered portion. To the gap between the ceramic heater body and the flange to join the ceramic heater body and the flange.

  In the present invention, a flange is externally fitted to a standing ceramic heater body with the chamfered portion facing up, and a bonding agent mainly composed of glass is disposed on the upper surface of the flange and heated. As a result, the bonding agent softened by gravity is smoothly guided from the chamfered portion to the gap between the ceramic heater main body and the flange, thereby joining the ceramic heater main body and the flange.

Therefore, the ceramic heater body and the flange can be joined easily and reliably.
(14) According to a fourteenth aspect of the present invention, in the ceramic heater manufacturing method according to any one of the first to tenth aspects, the ceramic heater body is erected, and the chamfered portion is provided on the erected ceramic heater body. The flange is externally fitted upward, a resin adhesive is disposed on the upper surface of the flange, and the resin adhesive is guided from the chamfered portion to the gap between the ceramic heater and the flange, thereby the ceramic heater body. And the flange are joined.

  In the present invention, the flange is externally fitted to the upright ceramic heater body with the chamfered portion facing up, and the resin bonding agent is disposed on the upper surface of the flange. Accordingly, the bonding agent is smoothly guided from the chamfered portion to the gap between the ceramic heater body and the flange by gravity, thereby joining the ceramic heater body and the flange.

  Therefore, the ceramic heater body and the flange can be joined easily and reliably.

  Next, an example (example) of the best mode of the present invention will be described.

a) First, the structure of the ceramic heater of the present embodiment will be described.
The ceramic heater of the present embodiment is attached to a heat exchange unit of a warm water washing toilet seat, for example, and used to warm washing water.

  As shown in FIG. 1, the ceramic heater 1 includes an alumina plate-like flange 5 that is externally fitted to an alumina long pipe-shaped (cylindrical) ceramic heater body 3. The flange 5 is joined and integrated by a glass adhesive 7.

  The ceramic heater body 3 is obtained by winding an alumina sheet-like heater member 11 around an outer peripheral surface of an alumina core member 9. A heater (not shown) accommodated in the exchanger 13 (see FIG. 6) is built in, and a pair of heater terminals 15 disposed outside the heat exchanger 13 is formed on the rear end side.

  As shown in FIG. 2, the flange 5 is a square plate-shaped member having a length of 30 mm × width of 30 mm × thickness of 4.0 mm, and has a diameter of φ11.85 mm penetrating the flange 5 in the plate thickness direction at the center. A circular through hole 17 is formed. Note that small-diameter mounting holes 19 are also provided at the four corners.

  As shown in FIG. 3 (cross section AA in FIG. 2), one opening end side of the through hole 17 of the flange 5, that is, the opening end side that becomes the rear end side when attached to the ceramic heater body 3 (upper side in the figure) ) Is provided with a chamfered portion 21 such that the diameter of the opening (introduction opening) 23 increases toward the opening end side. In addition, the shape of the opening end surface of the flange surface is a circle having a diameter of φ16 to 18 mm.

  That is, as shown in an enlarged view in FIG. 4, the chamfered portion 21 has an R shape whose cross section (that is, a cross section along the central axis of the through hole 17) has a radius of 2 to 3 mm (for example, 2.5 mm). The center point C is set to a distance of 2 to 3 mm (for example, 2.5 mm) from the front end surface of the flange 5 and the inner peripheral surface of the through hole 17.

  Therefore, due to the structure of the chamfered portion 21, the opening area of the introduction opening 23, which is a space opened to the opening end side of the through-hole 17, increases more rapidly on the rear end side (opening end side) than on the front end side. It has become. That is, the surface shape of the chamfered portion 21 is a convex shape outwardly with a curved surface (having an R-shaped cross section).

  Further, the inner peripheral surface on the tip end side of the through hole 17 is a cylindrical proximity portion 25 (that is, a portion in which the cross-sectional shape is substantially straight) having substantially the same diameter, and its dimension L is 1 to 2 mm ( For example, it is set to 2 mm). The dimension L is in the range of 1/4 to 1/2 (for example, 1/2) with respect to the entire thickness of the flange 5.

  Specifically, the proximity portion 25 is a pseudo circle 25a (dimension L1 = 1.5 mm, for example) having exactly the same inner diameter of the through-hole 17, and a pseudo portion that constitutes a part of the chamfer 21 connected to the true circle 25a. It is comprised from the perfect circle part 25b (dimension L2 = 0.5mm). That is, in the pseudo perfect circle portion 25b, the inner diameter of the through-hole 17 increases as it goes upward from the upper end of the true circle portion 25a, but since the degree of increase is slight, a substantially true circle is formed. Can be considered part. In addition, as the range of this pseudo perfect circle part 25b, the deviation of the dimension of the radial direction from the perfect circle part 25a can be adopted within 0.3 mm.

  Further, in the proximity portion 25, the distance between the outer peripheral surface of the ceramic heater body 3 and the inner peripheral surface of the flange 5 (the dimension of the gap 26: one side) is set to, for example, 0.3 mm in the range of 0.2 to 2 mm. Yes.

b) Next, the manufacturing method of the present embodiment will be described.
-First, the manufacturing method of the ceramic heater main body 3 is demonstrated.
For example, an alumina-based (alumina 90% by weight or more) ceramic sheet (green sheet) is manufactured by a doctor blade method.

  Next, a high melting point metal such as tungsten is printed on one surface of the ceramic sheet to form a heater (heater pattern). Similarly, a terminal pattern to be the heater terminal 15 is formed on the other surface, and the terminal pattern and the heater pattern are connected through a through hole.

  The heater pattern is formed on one side of the ceramic sheet, that is, on the front end side of the heater member 11 so as to be arranged inside the heat exchanger 13, and the terminal pattern is arranged outside the heat exchanger 13. In this way, the heater member 11 is formed on the rear end side.

Next, another ceramic sheet is laminated so as to cover the heater pattern to form a laminate of ceramic sheets.
Next, an alumina paste is applied to the laminated ceramic sheet 41, wound around the outer peripheral surface of the pre-fired alumina pipe-shaped core member 9, bonded and pressurized, and integrally fired. As a result, as shown in FIG. 5A, the ceramic heater body 3 having a shape in which the sheet-like heater member 11 is wound around the core member 9 is obtained.

  Next, the ceramic heater body 3 is erected with the rear end side (upper side in the figure) facing up, and a ceramic flange 5 is fitted on the rear end side. That is, the ceramic heater body 3 is passed through the through hole 17 of the flange 5 and the flange 5 is arranged at a predetermined mounting position.

  Next, a ring-shaped glass adhesive 7 is fitted from above the ceramic heater body 3 and placed on the flange 5. As the glass adhesive 7, for example, a borosilicate glass adhesive can be employed.

Next, the glass adhesive 7 is heated and melted to join the flange 5 to the ceramic heater body 3 as shown in FIG.
In particular, in this embodiment, the glass adhesive 7 is disposed on the upper portion of the through hole 17 of the flange 5. Therefore, as shown in FIG. 4, the molten glass adhesive 7 is introduced into the introduction opening of the through hole 17 by gravity. The flange 5 and the ceramic heater body 3 are firmly joined by being introduced into the portion 23, further guided to the gap 26 in the proximity portion 25, and then solidified.

-Next, the manufacturing method of the heat exchange unit 13 is demonstrated.
As shown in FIG. 6, the ceramic heater 3 manufactured by the above-described method is inserted into the heat exchanger 27 with the heater side first, and the flange 5 is attached to the fixing portion 29 of the heat exchanger 27. Abut.

Next, the flange 5 is fixed to the fixing portion 29 using a fixing member (screw or the like) 31 to complete the heat exchange unit 1.
c) As described above, in this embodiment, the chamfered portion 21 whose opening area rapidly increases toward the rear end side (that is, toward the opening end side from the inner side) in the through-hole 17 of the flange 5, that is, the cross section is R-shaped. Since the chamfered portion 21 is provided, when the glass adhesive 7 is melted, the melted glass adhesive 7 is smoothly introduced into the through hole 17, that is, the introduction opening 23 and the gap 26. Therefore, the flange 5 and the ceramic heater body 3 can be quickly joined, and the workability is excellent.

  In this embodiment, since the cross section of the chamfered portion 21 is R-shaped, the opening area can be increased even when the length of the proximity portion 25 is sufficiently long. Therefore, there is a remarkable advantage that it is possible to ensure high bondability by sufficiently taking the length of the proximity portion 25 and to ensure the ease of flowing of the glass adhesive 7.

  Furthermore, since the length of the proximity portion 25 can be sufficiently secured, there is an advantage that the thickness of the flange 5 does not need to be increased, the cost can be reduced, and the design change of surrounding members such as the counterpart member is unnecessary.

Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
The present embodiment is different from the first embodiment in the shape of the chamfered portion.
As shown in FIG. 7, in the ceramic heater 41 of the present embodiment, the cross-sectional shape along the central axis of the through hole 45 of the chamfered portion 47 of the flange 43 is not a curved line but a multistage shape in which straight lines are bent.

  That is, the cross-sectional shape of the chamfered portion 47 is bent at a plurality of locations so as to be convex outward, and the opening area increases rapidly toward the rear end side (opening end side) as in the first embodiment. It is like. Note that the degree of rapid increase becomes substantially the same as the R shape of the first embodiment as the number of stages increases.

  Also in this embodiment, the same effects as those of the first embodiment can be obtained.

Next, the third embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
This embodiment is different from the first embodiment in the shape of the rear end face of the flange.
As shown in FIG. 8, in the ceramic heater 51 of the present embodiment, as in the first embodiment, the through hole 55 of the flange 53 has a chamfered portion 57 having an R-shaped cross section.

In particular, in the present embodiment, the rear end surface of the flange 53 has a stop step 59 that is one step higher than the opening end of the chamfered portion 57.
Therefore, when the glass adhesive 61 is melted, the stop step 59 has an effect that the glass adhesive 61 can be prevented from flowing out to the periphery other than the through hole 61.

Next, the fourth embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
The present embodiment is different from the first embodiment in the shape of the chamfered portion.
As schematically shown in FIG. 9, in this embodiment, the cross-sectional shape of the chamfered portion 75 along the penetration direction of the through hole 73 of the flange 71 is the R shape (the dotted line in the figure) of the first embodiment. Compared to the change in the thickness direction of the flange 71, the change in the radial direction is set to be large.

That is, the cross-sectional shape of the chamfered portion 75 is a shape that can be expressed by a function in which the degree of increase in the opening area is larger than that of the R shape.
Specifically, the cross-sectional shape is a shape indicated by y = 2logx (y is the thickness direction of the flange 71 and x is the radial direction of the flange 71).

  Therefore, in this embodiment, as in the first embodiment, the chamfered portion 75 starts to bend from the upper end of the perfect circle portion 77, but compared with the R shape, the area of the introduction opening 79 (cut perpendicular to the penetrating direction). In this case, the opening area) increases rapidly, and the opening area at the opening end of the chamfered portion 75 is large.

  The open end of the chamfered portion 75 is a large circle having a diameter of about 20 mm. Further, the dimension L1 in the penetrating direction of the perfect circle portion 77 is the same as that of the first embodiment, and the dimension L of the proximity portion 78 is substantially the same as that of the first embodiment.

  Thus, in this embodiment, there is an advantage that the glass adhesive can be smoothly introduced into the introduction opening 79 at the time of bonding with the glass adhesive.

Next, although Example 5 is demonstrated, description of the content similar to the said Example 1 is abbreviate | omitted.
The present embodiment is different from the first embodiment in the shape of the chamfered portion.
As shown in FIG. 10, in this embodiment, the cross-sectional shape of the chamfered portion 85 along the penetration direction of the through hole 83 of the flange 81 is larger in the thickness direction with respect to the radial change of the flange 81 than the R shape. The change is set to be large.

That is, the chamfered portion 85 has a shape that falls downward in the figure as compared with the R shape (dotted line in the figure).
Specifically, the cross-sectional shape of the graph of y = 2logx (y is the thickness direction of the flange 81, x is the radial direction of the flange 81) of Example 4 is a shape that is line-symmetric with respect to y = x. is there.

  Therefore, in this embodiment, the chamfered portion 85 starts to bend from the same starting position as the R shape on the flange surface of the first embodiment, but the chamfered portion 85 falls quickly compared to the R shape, and the size of the perfect circle portion 87 is larger. It is getting shorter.

  The shape of the open end of the chamfered portion 75 is the same as that in the first embodiment. Further, compared with Example 1, the dimension L1 in the penetrating direction of the perfect circle part 87 is as short as about 0.4 mm, the dimension L2 of the pseudo perfect circle part 88 is as long as about 1 mm, but the dimension L of the proximity part 89 is It is almost the same as the first embodiment.

  In the case of the present embodiment, since the chamfered portion 85 extends to the depth (front end side) of the through-hole 83 as compared with the fourth embodiment, a sufficient glass adhesive can be secured in the introduction opening 90 and the glass glass There is an advantage that the adhesive can be smoothly introduced to the back of the through hole 83.

In addition, this invention is not limited to the said Example at all, and it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.
(1) For example, an organic adhesive may be used instead of a glass adhesive. Moreover, a resin-made flange can be employ | adopted as a flange.

  (2) Moreover, in the said Example 1 etc., although the cross-sectional shape of the chamfered part was made into R shape, if it is cross-sectional shape which an opening area increases to a degree larger than one straight line of 45 degrees of inclination, for example, various A curved line or multi-stage straight line structure can be adopted.

It is explanatory drawing which fractures | ruptures and shows the ceramic heater of Example 1. FIG. It is a top view which shows the flange of the ceramic heater of Example 1. FIG. It is sectional drawing which expands and shows the AA cross section of the flange of FIG. It is explanatory drawing which expands and shows the junction part of a ceramic heater and a flange. FIG. 3 is an explanatory diagram showing a manufacturing procedure for the ceramic heater of Example 1. It is explanatory drawing which fractures | ruptures and shows the heat exchange unit of Example 1. FIG. It is explanatory drawing which fractures | ruptures and shows the ceramic heater of Example 2. FIG. It is explanatory drawing which fractures | ruptures and shows the ceramic heater of Example 3. FIG. It is explanatory drawing which fractures | ruptures and shows the flange of the ceramic heater of Example 4. FIG. It is explanatory drawing which fractures | ruptures and shows the flange of the ceramic heater of Example 5. FIG. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 41, 51 ... Ceramic heater 3 ... Ceramic heater main body 7, 61 ... Glass adhesive 5, 43, 53, 71, 81 ... Flange 9 ... Core member 11 ... Heater member 17, 45, 55, 73, 83 ... Through Hole 21, 47, 57, 75, 85 ... Chamfer 25, 89 ... Proximity 23, 79, 90 ... Introducing opening 59 ... Stop stage

Claims (14)

In a ceramic heater in which a flange having a through hole and a long ceramic heater main body passed through the through hole of the flange are joined by a bonding agent,
At least one open end of the through hole of the flange is provided with a chamfered portion whose opening area is increased on the open end side, and a part or the entire surface shape of the chamfered portion is convex outward by a curved surface. A ceramic heater having a shape or a convex shape outward by a plurality of planes.   The ceramic heater according to claim 1, wherein the ceramic heater body is a cylindrical member.   3. The ceramic heater according to claim 1, wherein a cross-sectional shape of the chamfered portion along the through direction of the through hole of the flange is an R shape.   The cross-sectional shape along the penetration direction of the through hole of the flange in the chamfered portion has a larger radial change with respect to a change in the thickness direction of the flange than the R shape. 2. The ceramic heater according to 2.   The cross-sectional shape along the penetration direction of the through hole of the flange in the chamfered portion has a greater change in the thickness direction with respect to a change in the radial direction of the flange than in the R shape. 2. The ceramic heater according to 2.   The dimension of the penetration direction of the proximity | contact part which adjoins the said ceramic heater main body in the through-hole of the said flange is in the range of 1/10-1/2 of the thickness of the said flange, The said Claim 1 or 2 characterized by the above-mentioned. The ceramic heater described in 1.   The ceramic heater according to any one of claims 1 to 6, wherein a heating element is disposed on one end side of the ceramic heater body, and a chamfered portion of the flange is provided on the opposite side of the heating element.   8. The gap between the outer peripheral surface of the ceramic heater main body and the inner peripheral surface of the through hole of the flange other than the chamfered portion is 0.2 to 2 mm. Ceramic heater.   9. The step according to claim 1, wherein a step portion for preventing the bonding agent from flowing out is provided outside the chamfered portion in the outer peripheral direction on the surface side where the chamfered portion of the flange is provided. The ceramic heater described in 1.   The ceramic heater according to any one of claims 1 to 9, wherein the flange is made of ceramic, and the bonding agent is a glass-based material or a resin adhesive.   The ceramic heater according to claim 1, wherein the flange is made of ceramic or resin, and the bonding agent is a resin adhesive.   A heat exchanger unit comprising the ceramic heater according to any one of claims 1 to 11 attached to a heat exchanger. In the method for manufacturing a ceramic heater according to any one of claims 1 to 10,
The ceramic heater main body is erected, the flange is externally fitted to the erected ceramic heater main body with the chamfered portion facing up, and a bonding agent mainly composed of glass is disposed on the upper surface of the flange. The bonding agent is softened by heating at a temperature, and the bonding agent is guided from the chamfered portion to the gap between the ceramic heater body and the flange to bond the ceramic heater body and the flange. A method for manufacturing a ceramic heater. In the method for manufacturing a ceramic heater according to any one of claims 1 to 10,
The ceramic heater body is erected, the flange is externally fitted to the erected ceramic heater body with the chamfered portion facing up, a resin adhesive is disposed on the upper surface of the flange, and the resin adhesive is A method of manufacturing a ceramic heater, wherein the ceramic heater body and the flange are joined by being guided from the chamfered portion to a gap between the ceramic heater and the flange.

Images