JPS6331500Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device using a barium titanate semiconductor ceramic heating element (hereinafter referred to as a positive characteristic heating element) having a positive temperature coefficient of resistance.

With positive characteristic heating elements, any heat generation temperature can be obtained by appropriately selecting the heating temperature, and when the heat generation temperature reaches a certain temperature, the electrical resistance value increases rapidly and self-heating is automatically controlled. It has a self-temperature control function, and unlike conventional nichrome heating elements, there is no risk of overheating, and because it is safe and reliable, it has been widely used as a heat source in various heat generating devices. This positive characteristic heating element can be used as a heating device for keeping electronic jars warm, a heating device for oil atomization in kerosene heaters, a heating device for preventing deterioration of fluidity of various equipment such as oil or circulating oil at low temperatures, or for toxic gases. When configuring a heat generating device for heating gas, etc., it is necessary to insulate the positive temperature heating element from moisture, oil, gas, etc. to improve operational reliability, stability, and long life. However, this type of heat generating device must have a structure that transmits the heat generated in the positive characteristic heating element to the heated object as efficiently as possible, and the heat generation temperature is extremely high, at a maximum of around 300 degrees Celsius. Due to the unique circumstances such as the need for a pair of lead wires to supply power to a positive temperature heating element, conventional technology applied to maintain airtightness and watertightness in ordinary equipment is difficult. For example, fitting an O-ring to ensure watertightness and airtightness is impossible without special technical treatment, which has conventionally resulted in an increase in the number of parts, processing and assembly man-hours, and increased costs. Moreover, it was not possible to ensure sufficient airtightness and watertightness.

This invention solves this conventional technical problem,
It is an object of the present invention to provide a heat generating device with a small number of parts and a small number of processing and assembly man-hours, and which can ensure a high degree of waterproofness and airtightness.

In order to achieve the above object, the heat generating device according to the present invention has a heat dissipating plate placed in an internal space composed of a heat dissipating plate and a lid body, which are arranged opposite to each other and whose peripheral edges are bonded and fixed to each other. A positive temperature heating element is built-in which is thermally bonded to the inner surface through an insulating plate, and a lead wire connected to an electrode of the positive temperature heating element is guided to the outside through a hole provided in the lid. In the heat generating device in which an insulating resin is filled around the positive characteristic heating element in the internal space, the lid body has a hole for air escape when the insulating resin is filled, in addition to the hole, and the heat sink has a hole on the outer periphery. It has a flange around the entire circumference, and a central portion located inside the flange protrudes from the inside to the outside to form a heat radiation surface, and the flange of the heat radiating plate has a radiating surface. It is characterized in that the periphery of the lid is bonded and fixed at a position that is set back toward the lid from the surface of the heat dissipation surface.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples. FIG. 1 is a front sectional view of a heat generating device according to the present invention, and FIG. 2 is a partially sectional plan view thereof. In the figure, reference numeral 1 denotes a heat sink made of a metal material with good thermal conductivity, such as aluminum. This heat dissipation plate 1 has a collar portion 2 over the entire outer circumference.
At the same time, a central portion located inside the flange portion 2 is made to protrude from the inside toward the outside to form a heat dissipation surface 3 that serves as a heat exchange surface with the object to be heated. Since the heat radiation surface 3 protrudes outward from the collar portion 2, the heat radiation surface 3 can be brought into close contact with the object to be heated.

4 is a lid body made of a metal material such as stainless steel. The lid body 4 has a flange portion 5 of substantially the same shape as the flange portion 2 of the heat sink 1, and has tabs 6 projecting from three to four locations on the outer periphery of the flange portion 5. By bending and caulking the heat sink plate 1
are integrally connected. The heat sink 1 has a flange 2 around the entire outer circumference, and a central portion located inside the flange 2 protrudes from the inside to the outside to form a heat radiating surface 3. On the other hand, since the periphery of the lid 4 is joined at a position that is set back toward the lid 4 from the surface of the heat dissipation surface 3, the joint between the collar 2, the collar 5, and the tab 6 is effective for heat dissipation. It is set at a position further back than surface 3. Therefore, the heat dissipation surface 3 is not affected by the unevenness at the joint portion. The center portion of the lid body 4 is made to protrude in the opposite direction to the heat dissipation surface 3 of the heat dissipation plate 1, that is, from the inside to the outside, and a pair of through holes 8, 9 are provided at appropriate positions in this protrusion portion 7. Deaeration hole 19
It has a configuration with .

10 is a positive characteristic heating element. Positive characteristic heating element 10
is formed into a flat plate shape, and one side in the thickness direction is in close contact with the inner surface of the heat dissipation surface 3 of the heat dissipation plate 1 via the insulating plate 12 in the internal space 11 constituted by the heat dissipation plate 1 and the lid body 4. It is built-in like this. In this embodiment, the positive temperature heating element 10 has a common electrode 13 on one side facing the insulating plate 12, and a pair of divided electrodes 14 and 15 on the other side. A lead wire 1 is attached to each of the divided electrodes 14 and 15 by, for example, soldering or the like.
6 and 17 are connected and fixed, and the lead wires 16 and 17 are led out through through holes 8 and 9 provided in the lid 4. As described above, in the present invention, one side that is thermally coupled to the heat dissipation plate 1 through the insulating plate 12 is the flat common electrode 13, and the heat dissipation surface 3, the insulating plate 12 and the positive temperature heating element 10 are connected in sequence. Since the structure is made in close contact with each other, the positive characteristic heating element 10
Good thermal conductivity from to the heat dissipation surface 3 of the heat dissipation plate 1,
A product with high thermal efficiency can be obtained.

Internal space 11 composed of heat sink 1 and lid 4
An insulating resin 18 made of heat-resistant synthetic resin is filled around the positive temperature heating element 10 inside. With such a structure, the positive characteristic heating element 10
Since it is sealed with the insulating resin 18, waterproofness and airtightness are improved.

In addition, the heat sink 1 has a collar 2 around the entire outer circumference, and a central portion located inside the collar 2 protrudes from the inside to the outside to form a heat sink 3. Since the peripheral edge of the lid body 4 is joined to the portion 2 at a position that is set back toward the lid body 4 side from the surface of the heat dissipation surface 3, the joint portion between the collar portion 2, the collar portion 5, and the ear piece 6 is , since it is set at a position recessed from the heat dissipation surface 3, even if the joint portion swells due to filling with the insulating resin 18, the heat dissipation surface 3 will not be affected. Therefore, the flatness of the heat dissipation surface 3 is maintained, and the adhesion to the heated object is improved.
The degree of thermal bonding can be improved.

The insulating resin 18 is filled into the holes 8 and 9 provided in the cover 4. Since the insulating resin 18 is also injected and filled into the holes 8 and 9, a high degree of waterproofness and airtightness is achieved for the lead wires 16 and 17 that pass through the holes 8 and 9. In addition to the holes 8 and 9, a vent hole 19 is provided for air escape.
Therefore, even if the insulating resin 18 is injected from the holes 8 and 9 at the same time to improve the efficiency of the filling operation, the insulating resin 18 may be filled in the internal space 1.
The air inside 1 and the air bubbles contained in insulating resin 18 are released to the outside through vent hole 19 before insulating resin 18 hardens. This improves the degree of adhesion of insulating resin 18 when filled, and further improves waterproofing and airtightness. It is also possible to inject insulating resin 18 from one of holes 8 and 9, for example hole 8, and use the other hole 9 as an air vent, but in this case, the injection port for insulating resin 18 is limited to one of holes 8 and 9, so that the operation of injecting and filling insulating resin 18 takes a long time,
The workability becomes poor.

Additionally, collar portions 5 and 6 are provided on the periphery of the heat sink 1 and the lid body 4.
are provided, and the flanges 5 and 6 are joined so that they face each other, so when the insulating resin 18 is injected and filled, the insulating resin 18 covers the flanges 5 and 6 as shown in an enlarged view in FIG. It is filled in such a way that it extends along the joint part of the joint part in the direction of its outer circumference. Therefore, the seal between the two 5 and 6 is perfect, and waterproofness and airtightness are improved.

Therefore, according to the present invention, it can be used to keep electronic jars warm, to atomize oil in kerosene stoves, to prevent deterioration of fluidity of machine oil or circulating oil for various devices at low temperatures, or to heat gases such as toxic gases. As such, it is possible to provide a heating device that is very suitable when it is necessary to insulate a positive temperature heating element from moisture, oil, gas, or the like. Furthermore, as shown in the above embodiments, the heat generating device according to the present invention only needs to be provided with each component of the heat sink 1, the lid 4, and the positive temperature heating element 10, and the number of parts is small, and the processing and Easy to assemble and low cost.

As described above, the heat generating device according to the present invention provides the following effects.

(a) In an internal space consisting of a heat sink and a lid that are arranged facing each other and whose peripheral edges are bonded and fixed to each other, thermally bonded to the inner surface of the heat sink via an insulating plate. A positive characteristic heating element is built in, and a lead wire connected to an electrode of the positive characteristic heating element is guided to the outside through a hole provided in the lid, and insulation is provided around the positive characteristic heating element in the internal space. Since it is filled with resin, the number of parts is reduced.
Fewer processing and assembly steps, yet highly waterproof,
A heat generating device that can ensure airtightness can be provided.

(b) In addition to the hole for leading out the lead wire, the lid has a degassing hole for air escape when filling with insulating resin.
It is possible to provide a heat generating device that can simultaneously inject insulating resin through a pair of holes through which lead wires are led out, thereby improving filling efficiency and degassing.

(c) The heat radiating plate has a flange around the entire outer periphery, and a central portion located inside the flange protrudes from the inside to the outside to form a heat radiating surface, and the flange of the heat radiating plate On the other hand, since the periphery of the lid is bonded and fixed at a position that is set back toward the lid from the surface of the heat radiation surface of the heat sink, the effects of unevenness at the joint and the effects of filling with insulating resin are reduced on the heat radiation surface. It never reaches. Therefore, it is possible to provide a heat generating device in which the flatness of the heat radiation surface is maintained, the adhesion to the object to be heated is increased, and the degree of thermal coupling is improved.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a heat generating device according to the present invention;
FIG. 2 is a partial cross-sectional plan view, and FIG. 3 is an enlarged cross-sectional view of the main parts. 1... Heat sink, 11... Internal space, 3... Heat sink, 12... Insulating plate, 4... Lid, 13... Common electrode, 8, 9... Through hole, 14, 15... Division Electrode, 10... Positive characteristic heating element, 16, 17... Lead wire.

Claims (1)

[Claims for Utility Model Registration] (1) In an internal space consisting of a heat sink and a lid body, which are arranged opposite to each other and whose peripheral edges are joined and fixed to each other, against the inner surface of the heat sink. A positive temperature heating element that is thermally bonded through an insulating plate is built in, and a lead wire connected to an electrode of the positive temperature heating element is guided to the outside through a hole provided in the lid body. In a heat generating device in which an insulating resin is filled around a positive characteristic heating element, the lid body has a deaeration hole for air escape when the insulating resin is filled, in addition to the hole, and the heat dissipation plate is arranged around the entire outer periphery. a flange, and a central portion located inside the flange protrudes from the inside to the outside to form a heat radiating surface, and the radiating surface of the heat radiating plate has a flange portion of the radiating plate. At a position retreated toward the lid body side from the surface,
A heat generating device characterized in that a peripheral edge of the lid body is bonded and fixed. (2) The positive temperature heating element has a common electrode on the side facing the insulating plate, a pair of divided electrodes on the opposite side, and a lead wire is connected to each divided electrode. A heat generating device according to claim 1 of the utility model registration claim characterized by: