JPH0974970A - Positive characteristic thermistor heat generator for thermal transpiration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a PTC heat generator capable of uniformly heating a suction core to be heated, enabling the simplification and compaction of the constitution to lower the cost, and suitable as a heater for a thermal transpiration device. SOLUTION: A metal molded product 2 equipped with a spring-elastic heat- releasing member 2a, an electrode 2b and an electrode terminal 2c is fit onto the periphery of an approximately semi-elliptic cylindrical, hole 1b disposed in the nearly central part of a bottomed heat-resistant insulating case 1 having an opened upper surface. One surface of a PTC heat-generating element 3 is brought into contact with the electrode part 2b of the metal molded product 2, and the other surface of the PTC heat-generating element 3 is also brought into contact with an electrode plate 4 equipped with a spring-elastic electrode part 4a and a spring-elastic electrode part 4b. The upper opening of the heat- resistant insulating case 1 is covered with a heat-resistant lid member 5 in which a hole 5a having the substantially same size as that of the cylindrical hole 1b of the heat-resistant insulating case 1 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive temperature coefficient thermistor (hereinafter abbreviated as "PTC") heating element that is preferably used as a heating element in a heating evaporation device such as a liquid type electronic mosquito trap. In particular, the present invention relates to a wick that can be heated uniformly, which is a body to be heated, and a cost is reduced by simplifying the configuration and downsizing.

[0002]

2. Description of the Related Art As an example of a heating evaporation device, for example, a liquid type in which a drug solution containing an insecticidal component such as flamethrin or allethrin is sucked up by a wick and is indirectly heated by a heating body to evaporate the drug solution. There is an electronic mosquito trap. Usually, a PTC heating element is used as a heating element in this kind of electronic mosquito trap, but this is because the PTC heating element has a specific resistance value below the Curie temperature and acts as a heating element. It has a self-temperature control function that when the temperature exceeds the temperature, the resistance value suddenly increases to cut off the energization, and the suction core, which is the object to be heated, can be safely heated without a temperature sensor or control circuit. Because you can do it.

As a PTC heating element used in a liquid type electronic mosquito trap, various configurations have been proposed and put to practical use from the past. For example, Japanese Utility Model Application Laid-Open No. 5-88280 filed by the applicant of the present invention. The publication discloses a PTC heating element using a PTC heating element formed in a ring shape.

The PTC heating element disclosed in this publication can heat the wicking core uniformly from the circumferential direction with excellent heating efficiency, and as is clear from the drawing (FIG. 3) of the publication, Since the ring-shaped PTC heating element is sealed by the pair of ring-shaped electrode plates 13 and the protective layer 14 made of fluororubber, the P-shaped PTC heating element P
It has an advantage that the resistance-temperature characteristic and the voltage-current characteristic of the TC heating element are hardly deteriorated. The PTC heating element includes a heat-resistant insulating plate 15 having the ring-shaped PTC heating element and a pair of ring-shaped electrode plates 13, a cylindrical column 15a fitted to the inner wall of the ring-shaped PTC heating element, and the heat-resistant insulating plate 15. The heat-resistant insulating plate 25 having the hole portion 25a facing the cylindrical column 15a is fixed in a pressed state by the holder 16 made of aluminum or the like having the cylindrical portion 16a. There is also an advantage that electrical contact failure does not occur between the PTC heating element and the electrode plate 13 due to the influence of swelling or the like.

However, in the PTC heating element having the above-mentioned structure, the ring-shaped PTC heating element used has an outer diameter of about 19 mm and a large occupied area, so that, for example, a disk-shaped (for example, disk-shaped) PTC heat generation. Compared to a small-diameter device such as an element, the production quantity per unit area is small and the productivity is poor. In general, since the PTC heating element is manufactured by placing it on a plane, the production quantity per unit area greatly affects the cost.

Therefore, recently, instead of the ring-shaped PTC heating element, a disk-shaped PTC heating element whose diameter can be reduced to about 10 mm or less is used.
Attempts are being made to construct a C heating element to reduce costs. As an example of the disclosure of the PTC heating element using the disk-shaped PTC heating element, for example, JP-A-5-292862 and JP-A-6-62868 are disclosed.
No. 38,657, etc. are mentioned.

First, in Japanese Patent Laid-Open No. 5-292862, a disk-shaped PTC heating element having a pair of electrode plates fixed on both sides with an insulating adhesive is used as a cylinder having a hole formed in the thickness direction. It is housed in a bottomed insulating case provided with a heat radiating portion having an internal shape that substantially conforms to the outer shape of the heat transfer plate together with a heat transfer plate provided with a plate-shaped portion, and is integrated by an insulating lid. Disclosed is a PTC heating element.

Further, Japanese Patent Application Laid-Open No. 6-38657 discloses that
A state in which a disk-shaped PTC heating element having a pair of electrode plates fixed on both sides via an insulating adhesive is housed in a housing part formed in a through hole in a part of a metal radiator made of aluminum or the like. There is disclosed a PTC heating element which is mounted on a second insulating case, is filled with a filling resin into the housing of the metal radiator, and is then covered with the first insulating case to be integrated. A second through hole is formed in the metal radiator in addition to the PTC heating element housing portion, and the suction core is inserted into the through hole.

[0009]

However, first of all,
In the case of the PTC heating element disclosed in Japanese Unexamined Patent Publication No. 5-292862, a heat transfer plate made of aluminum or the like is formed in a block shape, and the heat transfer plate is located near the outer wall of the insulating case. Therefore, there is a drawback that heat is dissipated from this portion to the outside. As a result, a temperature difference occurs between the inner wall surface on the side where the PTC heating element is provided and the inner wall surface on the side where the PTC heating element is not provided in the heat dissipation portion of the insulating case through which the suction core is inserted. The wicking core could not be heated uniformly.

In the case of the PTC heating element disclosed in Japanese Patent Laid-Open No. 6-38657, the other end of the metal radiator, which is not provided with the PTC heating element, that is, the suction core is inserted. Since the portion where the through hole is formed is exposed outside the insulating case in a bare state, a large amount of heat is dissipated into the outside air, and as a result, the side of the through hole where the PTC heating element is provided. There is a disadvantage that a temperature difference occurs between the inner wall surface of No. 1 and the inner wall surface on the side where the PTC heating element is not provided, and the suction core cannot be heated uniformly.

The present invention has been made on the basis of the above points, and an object thereof is to be able to uniformly heat the wick, which is the object to be heated, and to simplify and downsize the structure. Accordingly, it is an object of the present invention to provide a PTC heating element suitable as a heating element for a heating evaporation device that enables cost reduction.

[0012]

In order to achieve the above object, a positive temperature coefficient thermistor heating element for a heating evaporation device according to the present invention is provided in a substantially central portion of a bottomed heat-resistant insulating case 1 having an open top surface. Around the substantially semi-elliptical cylindrical hole 1b, which has spring elasticity, the heat dissipation portion 2a, the electrode portion 2b, and the electrode terminal portion 2c.
The metal molded body 2 provided with is fitted, one surface of the PTC thermistor heating element 3 is placed in contact with the electrode portion 2b of the metal molded body 2, and the other surface of the PTC thermistor heating element 3 is provided with spring elasticity. The electrode plate 4 having the electrode portion 4a and the electrode terminal portion 4b is brought into pressure contact with the upper opening of the heat-resistant insulating case 1 and the cylindrical hole 1b of the heat-resistant insulating case 1 has a size substantially equal to that of the cylindrical hole 1b. Heat-resistant insulating lid member 5 provided with a portion 5a
It is characterized by being covered with.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The heat-resistant insulating case used in the present invention has a bottomed shape with an open upper surface, and a substantially semi-elliptical cylindrical hole is formed in the substantially central portion thereof.
Here, the “substantially semi-elliptical shape” means, for example, a shape in which an ellipse is halved, or a shape in which a semicircular portion and a square portion are combined. FIG. 1 referred to in the embodiment section of the present invention.
2 shows the structure of the heat-resistant insulating case 1 having a cylindrical hole 1b having a shape in which a semicircular portion and a square portion are combined. In FIG. 2, the right side of the figure shows a semi-circular portion, and the left side of the figure shows a square portion. When the PTC heating element of the present invention is put to practical use, for example, as shown in FIG. 4, the wick 6 which is the object to be heated is arranged substantially at the center of the semicircular portion of the cylindrical hole 1b. Then, the surface of the suction core 6 is heated to a desired temperature by the heat generation of the PTC heating element described later.

In the case of the heat-resistant insulating case 1 shown in these drawings, the outer shell 1a has a shape similar to the cylindrical hole 1b in which a semi-circular portion and a square portion are joined together. However, of course, other shapes may be used. In short,
It may have any shape as long as it has a bottomed shape with an open upper surface and a substantially semi-elliptical cylindrical hole is formed in the substantially central portion thereof. These are appropriately designed in consideration of the shape and size of the PTC heating element used in the present invention, the installation space in the heating evaporation device in which the PTC heating element of the present invention is incorporated, and the like.

The material forming the case is not particularly limited as long as it has both heat resistance and insulating properties. Examples thereof include resin materials such as polyphenylene sulfide (PPS) resin, silicone resin, phenol resin, polyamide resin, fluororesin, and epoxy resin. These may be appropriately selected in consideration of the heating temperature (Curie temperature) of the PTC heating element used in the present invention. For example, a PPS resin is particularly preferable because it has excellent heat resistance and insulation properties, as well as excellent chemical resistance, dimensional stability, and mechanical strength at high temperatures. The heat resistant insulating case may be provided with a through hole for leading out the electrode terminal portion of the metal molded body and / or the electrode terminal portion of the electrode plate, which will be described later.

A metal molded body having a heat radiating portion, an electrode portion and an electrode terminal portion is fitted in a cylindrical hole provided in the heat resistant insulating case in a close contact state. Therefore, the shape of the metal molded body is preferably a substantially semi-elliptical shape like the cylindrical hole of the heat-resistant insulating case, and the constituent material is one having excellent spring elasticity and functioning as an electrode. preferable. For example, a stainless plate, a phosphor bronze plate, a nickel-plated brass plate, a tin-plated brass plate, a silver-plated brass plate, etc. can be mentioned. Among these, stainless steel plate, phosphor bronze plate, etc.
It is particularly preferable because the spring elasticity can be sufficiently retained. In addition, in order to further strengthen the elasticity of the spring, it may be possible to provide a cutout portion in a part of the heat dissipation portion of the metal molded body.

One surface of the PTC heating element is arranged in contact with the electrode portion of the metal molded body and electrically connected thereto. The PTC heating element has a barium titanate-based ceramic element and electrode layers formed on both sides facing each other by baking silver paste, aluminum spraying, etc. The shape of the PTC heating element is a disk shape such as a disk shape or a square plate shape. The shape is preferably used. A ring-shaped one can be used, but when compared with a disc-shaped one, the productivity is inferior and it becomes difficult to reduce the cost.

On the other surface of the PTC heating element, an electrode plate having spring elasticity and having an electrode portion and an electrode terminal portion is pressed and contacted by the spring elasticity to be electrically connected. The constituent material is not particularly limited as long as it has excellent spring elasticity and functions as an electrode. For example, a stainless plate, a phosphor bronze plate, a nickel-plated brass plate, a tin-plated brass plate, a silver-plated brass plate, etc. can be mentioned. Among these, a stainless plate, a phosphor bronze plate, etc. are particularly preferable because they can sufficiently retain their spring elasticity even when subjected to a long-term cooling / heating cycle.

As for the shape, for example, the electrode portion has a substantially U-shaped cross section.
A thing formed in a letter shape is possible. Referring to FIGS. 1 and 3 referred to in the section of the embodiment of the present invention, an electrode plate 4 is formed by bending a stainless plate having a thickness of 0.2 mm so that the shape of the electrode portion 4a is substantially U-shaped in cross section. The configuration of is shown. With such a shape, the spring elasticity of the stainless plate is further enhanced. Therefore, the PTC heating element 3 receives the spring elasticity of the electrode plate 4 and is firmly and closely arranged on the electrode portion 2b side of the metal molded body 2. FIG.
Reference numeral 4b is an electrode terminal portion formed continuously with the electrode portion 4a.

The metal molded body, the PTC heating element and the electrode plate are housed in a heat-resistant insulating case, and then the upper opening of the heat-resistant insulating case has a hole of substantially the same size as the cylindrical hole of the heat-resistant insulating case. The PTC heating element of the present invention is obtained by covering with a lid member provided with a section. The material forming the lid member may be appropriately selected in consideration of the heating temperature (Curie temperature) of the PTC heating element to be used, like the heat resistant insulating case, and is not particularly limited. For example, resin materials such as PPS resin, silicone resin, phenol resin, polyamide resin, fluororesin and epoxy resin can be used. The lid member may be provided with a through hole for leading out the electrode terminal portion of the metal molded body and / or the electrode terminal portion of the electrode plate to the outside.

The PTC heating element of the present invention having the above construction exhibits the following actions. First, by changing the shape of the cylindrical hole provided in the heat-resistant insulating case from the conventional cylindrical shape to a substantially semi-elliptical shape, the PTC heating element is provided at the installation position of the suction core that is the object to be heated. It can be separated from the inner wall surface of the side cylindrical hole by a predetermined distance. Therefore, even if a temperature difference occurs between the inner wall surface of the cylindrical hole on the side where the PTC heating element is provided and the inner wall surface of the cylindrical hole on the side where the PTC heating element is not provided, the suction The surface of the core is heated uniformly in the circumferential direction.

Further, a sufficient gap is formed between the metal molded body fitted in the state of close contact with the cylindrical hole and the outer shell of the heat resistant insulating case, and the opening of the heat resistant insulating case is formed. Since the part is completely sealed by the lid member,
The gap acts as an air insulation layer. Therefore, PTC
The heat of the heating element is satisfactorily conducted to the cylindrical hole side through the metal molded body, and unnecessary heat dissipation is eliminated.

Further, as the PTC heating element, a disk-shaped element which can be reduced in diameter can be used, so that the production quantity per unit area is dramatically increased as compared with the case of using the ring-shaped PTC heating element. In addition, it is possible to reduce the number of parts by providing a part of the metal formed body with an electrode function. Therefore, the cost can be reduced as compared with the conventional PTC heating element.

As described above, in the PTC heating element according to the present invention, it is possible to uniformly heat the suction core, which is the object to be heated, and it is possible to reduce the cost by simplifying the structure and downsizing.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

The PTC heating element according to this embodiment has a structure as shown in FIGS. FIG. 1 is an exploded perspective view of a PTC heating element, FIG. 2 is a top view of a heat resistant insulating case constituting the PTC heating element, and FIG. 3 is a sectional view of the PTC heating element in a completed product state. The cutting direction of the cross-sectional view of FIG.
This is the direction indicated by I-I in FIG.

First, reference numeral 1 is a bottomed heat-resistant insulating case having an open upper surface, and a cylindrical hole 1b is integrally formed at a substantially central portion thereof. As shown in FIG. 2, the cylindrical hole 1b has a planar shape such that a semicircular portion and a rectangular portion are joined together. In FIG. 2, reference numerals d ₁ , d ₂ and d ₃ are for indicating the dimensions of the cylindrical hole 1b, respectively. In this embodiment, d ₁ is 5.5 mm, d ₂ is 11 mm, d ₃
Is set to 7 mm.

Reference numeral 1a is an outer shell of the heat-resistant insulating case 1, and the outer shell 1a has a planar shape similar to that of the cylindrical hole 1b such that a semicircular portion and a square portion are joined together. Is designed. The heat resistant and insulating case 1 is made of PPS resin having a thickness of 0.8 mm.

Around the cylindrical hole 1b, a metal plate 2 made of a stainless plate having a thickness of 0.2 mm and provided with a heat radiating portion 2a, an electrode portion 2b and an electrode terminal portion 2c is fitted in a close contact state. There is. A notch 2d having a width of about 2 mm is formed in the heat dissipation portion 2a of the metal molded body 2, whereby the spring elasticity of the metal molded body 2 is strengthened. Also, the electrode terminal portion 2c
The tip of the is led out to the outside from a through hole 1c formed in the bottom surface of the heat resistant insulating case 1. In actual use, a power supply lead wire (not shown) is connected to the electrode terminal portion 2c by spot welding or the like.

One surface of the PTC heating element 3 is arranged in contact with and electrically connected to the electrode portion 2b of the metal molded body 2.
The PTC heating element 3 was formed by baking a silver paste on both sides of a barium titanate-based ceramic element (Curie temperature 170 ° C., room temperature resistance 1.5 kΩ) formed in a disk shape having a diameter of 8 mm and a thickness of 2.5 mm. And an electrode layer (not shown) is formed.

On the electrode layer on the other surface of the PTC heating element 3, an electrode plate 4 is formed by bending a stainless plate having a thickness of 0.2 mm to form an electrode portion 4a in a substantially U-shaped cross section.
, Are pressed and contacted electrically by their spring elasticity, and are electrically connected. Reference numeral 4b is an electrode terminal portion formed continuously with the electrode portion 4a, and its tip is led out to the outside from a through hole 1c formed in the bottom surface of the heat resistant insulating case 1. In actual use, a power supply lead wire (not shown) is connected to the electrode terminal portion 4b by spot welding or the like.

Reference numeral 5 is a lid member provided with a hole 5a having substantially the same size as the cylindrical hole 1b provided in the heat-resistant insulating case 1, and covers the upper opening of the heat-resistant insulating case 1. Are bonded and fixed by a silicone resin adhesive (not shown). The lid member 5 is also made of PPS resin having a thickness of 0.8 mm, like the heat-resistant insulating case 1.

Here, in order to evaluate the heating characteristics of the PTC heating element having the above-mentioned structure, the following tests were carried out. FIG.
As shown in, the cylindrical hole 1 provided in the heat-resistant insulating case
In b, a commercially available liquid-type electronic mosquito trap wick 6 having a diameter of 8 mm and a length of about 80 mm (which is in a dry state not soaked in a chemical solution) is installed and a predetermined voltage is applied to the PTC heating element. And the wick 6 was heated. After the elapse of a predetermined time, the surface temperature at a position corresponding to the central portion in the height direction of the suction core 6 is measured at four locations in the circumferential direction (directions indicated by reference symbols A, B, C and D in FIG. 4). did. This test was conducted with the room temperature kept at 25 ° C. and the room temperature kept at 40 ° C., respectively.
In FIG. 4, the distance between the suction core 6 and the inner wall surface of the cylindrical hole 1b is 1.
It is 5 mm and the direction of the symbol C is 3 mm.

As a comparative example, a PTC heating element having a conventional structure as shown in FIG. 8 (for example, Japanese Patent Laid-Open No. 6-38657).
Of the structure disclosed in Japanese Patent Laid-Open Publication No. 2001-242242, which uses the same PTC heating element as in the present embodiment), and the same test as above was carried out. In FIG. 8, reference numeral 11 is an insulating case, reference numeral 1
Reference numeral 2 denotes a metal heat radiator exposed to the outside of the insulating case 11, and the suction core 6 is arranged in a through hole 12a provided in the metal heat radiator 12. The distance between the suction core 6 and the inner wall surface of the through hole 12a is 1.5 mm in all directions A, B, C and D.

[0035]

[Table 1]

As is clear from the test results shown in Table 1, in the case of the PTC heating element according to this example, the variation in the surface temperature of the suction core was extremely smaller than that in the comparative example, and the outside temperature was It shows a very stable heating characteristic even with the fluctuation of.

Next, an embodiment (application example) in which the PTC heating element according to the present invention is applied to a heating evaporation device (for example, a liquid type electronic mosquito trap) will be described with reference to FIGS. .

Generally, in a heating evaporation device using this type of PTC heating element as a heating element, for example, Japanese Patent Publication No.
As disclosed in Japanese Patent Application Laid-Open No. -11172 and the title of the invention, “Heating and Evaporating Device”, the lower part of the heating and evaporating device (for example
From the outside air intake), the amount of transpiration differs depending on the ascending airflow passing through the space between the PTC heating element and the suction core. This airflow design is very complicated in designing the body of the evaporation device. It becomes work. However, in the case of the PTC heating element of the present invention, as shown in FIG.
Since the temperature gradient between and is not uniform, the wick 6
The ascending air current passing through the clearance on the right side of the figure and the clearance on the left side of the suction core 6 in the figure is not uniform, and the clearance on the left side of the figure is larger. Using this phenomenon, for example, as shown in FIG. 6, when a structure for suppressing the generation of an ascending air current from the lower part of the heating evaporation device 21 is used, a wide non-uniform heating space exists near the PTC heating element. Therefore, a considerable amount of self-convection (indicated by an arrow in FIG. 6) is generated inside, and sufficient evaporation of the drug solution is recognized.

In order to investigate this effect, the diameter of the suction core is kept constant at 8 mm, the distance between the suction core and the inner wall surface of the cylindrical hole on the side where the PTC heating element is not provided is X, and the suction core is And P
The distance from the inner wall surface of the cylindrical hole on the side where the TC heating element is provided is Y, the Curie temperature of the PTC heating element is Tc,
Normally, the amount of transpiration required by this type of heating evaporation device is about 1
When the range in which g / day was obtained was obtained, under the in-plane conditions shown in FIG. 7, only in the small room accommodating the PTC heating element, even if the rising airflow from the lower part of the heating evaporation device was not generated. It has been found that a sufficient amount of transpiration can be obtained by self-convection. This facilitates the airflow design in the heating evaporation device, and the evaporation amount can be narrowed down to the problem of only the airflow design in the vicinity of the PTC heating element.

[0040]

As described above in detail, the PTC according to the present invention
The heating element has the following effects. First,
By changing the shape of the cylindrical hole provided in the heat-resistant insulating case from the conventional cylindrical shape to a substantially semi-elliptical shape, the installation position of the suction core, which is the object to be heated, can be set on the side where the PTC heating element is provided. It can be separated from the inner wall surface of the cylindrical hole by a predetermined distance. Therefore, even if a temperature difference occurs between the inner wall surface of the cylindrical hole on the side where the PTC heating element is provided and the inner wall surface of the cylindrical hole on the side where the PTC heating element is not provided, the suction The surface of the core is heated uniformly in the circumferential direction.

In addition, a sufficient gap is formed between the metal molded body fitted in the state of close contact with the cylindrical hole and the outer shell of the heat resistant insulating case, and the opening of the heat resistant insulating case is formed. Since the part is completely sealed by the lid member,
The gap acts as an air insulation layer. Therefore, PTC
The heat of the heating element is satisfactorily conducted to the cylindrical hole side through the metal molded body, and unnecessary heat dissipation is eliminated.

Further, as the PTC heating element, a disk-shaped element which can be reduced in diameter can be used, so that the production quantity per unit area is dramatically increased as compared with the case where the ring-shaped PTC heating element is used. In addition, it is possible to reduce the number of parts by providing a part of the metal formed body with an electrode function. Therefore, the cost can be significantly reduced as compared with the conventional PTC heating element.

As described above, the PTC heating element according to the present invention is capable of uniformly heating the wick of the object to be heated and reducing the cost. Therefore, it is extremely suitable as a heating body of a heating evaporation device such as a liquid type electronic mosquito trap, which has been in increasing demand in recent years.

[Brief description of drawings]

FIG. 1 is a view showing one embodiment of the present invention, and is an exploded perspective view of a PTC heating element.

FIG. 2 is a view showing an embodiment of the present invention and is a top view of a heat resistant insulating case.

FIG. 3 is a view showing an embodiment of the present invention and is a sectional view taken along the line I-I of the PTC heating element in a completed product state.

FIG. 4 is a view showing an embodiment of the present invention and is a top view showing a state in which a suction core is installed in a cylindrical hole of a heat resistant insulating case.

FIG. 5 is a diagram for explaining another embodiment (application example) of the present invention, and is a diagram showing a temperature gradient between a suction core and a PTC heating element.

FIG. 6 is a view for explaining another embodiment (application example) of the present invention, and is a view showing a state of self-convection occurring in a circumferential gap between the suction core and the PTC heating element.

FIG. 7 is a diagram for explaining another embodiment (application example) of the present invention, which is a relationship between the distance between the suction core and the inner wall surface of the cylindrical hole of the heat-resistant insulating case, and the Curie temperature of the PTC heating element. FIG.

FIG. 8 is a view showing a comparative example (conventional example) and is a top view showing a state in which a suction core is installed in a through hole of a metal radiator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat-resistant insulating case 1a ... Outer shell 1b ... Cylindrical hole 1c ... Through hole 2 ... Metal molded body 2a ... Heat dissipation part 2b ... Electrode part 2c ... Electrode terminal part 2d ... Notch part 3 ... PTC heating element 4 ... Electrode plate 4a ... Electrode part 4b ... Electrode terminal part 5 ... Lid member 5a ... Hole part 6 ... Suction core

Claims (2)

[Claims] 1. A heat radiating portion 2a and an electrode portion having spring elasticity around a substantially semi-elliptical cylindrical hole 1b provided at a substantially central portion of a bottomed heat-resistant insulating case 1 having an open top surface. 2b and an electrode terminal portion 2c are fitted to each other, one surface of the PTC thermistor heating element 3 is placed in contact with the electrode portion 2b of the metal molding 2, and the PTC thermistor heating element 3 The other surface has spring elasticity and has an electrode portion 4a and an electrode terminal portion 4
The electrode plate 4 provided with b is pressed into contact, and the upper opening of the heat-resistant insulating case 1 is inserted into the cylindrical hole 1 of the heat-resistant insulating case 1.
A positive temperature coefficient thermistor heating element for a heating evaporation device, characterized by being covered with a heat-resistant insulating lid member 5 provided with a hole 5a having a size substantially equal to b. 2. The positive temperature coefficient thermistor heating element according to claim 1, wherein a cutout portion 2d is provided in a part of the heat radiation portion 2a of the metal molded body 2.