JPH0443988Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Field The present invention relates to a positive temperature coefficient thermistor device used in, for example, an electronic mosquito repellent. When providing a heat dissipation surface on the surface side, use a positive temperature coefficient thermistor that has electrodes on both end faces in the width direction, and one side of the positive temperature coefficient thermistor in the thickness direction faces the opening side of the recess, and a pair of electrode terminals is used. By applying spring pressure to the positive temperature coefficient thermistor in the direction of the opening surface, the efficiency of heat conduction from the positive temperature coefficient thermistor to the heat radiation surface is increased, and the time required for the heat radiation surface to reach the specified temperature is shortened and accelerated. This improves thermal efficiency by reducing the difference between the heat generation temperature of the PTC thermistor and the surface temperature of the heat radiation surface. BACKGROUND ART As a conventional positive temperature coefficient thermistor device of this type, one having a structure shown in FIG. 3, for example, is known. In the figure, 1 is an insulating member, 2 is a positive temperature coefficient thermistor, 3 and 4 are a pair of electrode terminals, 5 is an insulating plate, and 6 is a heat dissipating member. The insulating member 1 is made of an electrical insulator with excellent heat resistance such as alumina porcelain, and has a recess 10 on one side.
1 is left open. The positive temperature coefficient thermistor 2 has electrodes 22 and 23 formed on both sides of the element body 21 in the thickness direction, and is housed in the recess 101 with one electrode 23 facing the opening surface of the recess 101. The electrode terminals 3 and 4 are formed of thin metal plates such as stainless steel, and are arranged on the bottom side and the opening side of the recess 101, respectively, so as to sandwich the PTC thermistor 2 from both sides in the thickness direction.
The electrode terminals 3 disposed on the bottom side have a spring property, and this spring property allows the electrode terminals 3 and 4 to be brought into pressure contact with the electrodes 22 and 23, and also connects the positive temperature coefficient thermistor 2 to the electrodes 22 and 23 through the insulating plate 5. , and is thermally coupled to the heat radiation surface 61 of the heat radiation member 6 which also serves as a holding fitting. The insulating plate 5 is made of a highly heat-resistant insulator such as mica, and the heat dissipating member 6 is formed into a case shape using a metal material such as aluminum or stainless steel. Problems to be Solved by the Invention However, in the conventional PTC thermistor device, the external lead terminal and Since the electrode terminal 4 is interposed, heat loss at the electrode terminal 4 increases. For this reason, it takes a long time to raise the surface temperature of the heat dissipation surface 61 to the temperature required for vaporizing the chemical liquid in an electronic mosquito repellent, for example, resulting in a lack of quick response. There were problems such as an increase in the temperature difference between the surface temperature of the material and the surface temperature of the material, resulting in a decrease in efficiency. Means for Solving the Problems In order to solve the above-mentioned conventional problems, the PTC thermistor device according to the present invention includes a heat-resistant insulating member with a concave opening on one side, and electrodes on both end faces in the width direction. a positive temperature coefficient thermistor housed in the recess with one surface in the thickness direction facing the opening surface of the recess; It is characterized by comprising a pair of electrode terminals that apply a pressing spring pressure, and a heat dissipation member that is electrically insulated and thermally coupled to the positive temperature coefficient thermistor on the opening surface side of the recess. Operation A PTC thermistor with electrodes provided on both end faces in the width direction is housed in the recess with one surface in the thickness direction facing the opening of the recess provided in the insulating member, and the PTC thermistor is placed on both sides of the PTC thermistor. By having a configuration with a pair of electrode terminals that press against the electrode from the end side and apply spring pressure in the direction of the opening surface, the heat generated in the PTC thermistor passes through the electrode terminal with large heat loss. The heat is transmitted to the heat dissipation member without any interference. Therefore, the heat conduction efficiency from the PTC thermistor to the heat dissipation member is increased, and a PTC thermistor device with excellent quick response and high thermal efficiency can be obtained. Embodiment FIG. 1 is an exploded perspective view of a PTC thermistor device according to the present invention, and FIG. 2 is a sectional view thereof. In the figure, the same reference numerals as in FIG. 3 indicate the same components. The positive temperature coefficient thermistor 2 has electrodes 22 and 23 provided on both end faces in the width direction of an element body 21, and both faces 2 in the thickness direction where no electrodes 22 and 23 are provided.
4 and 25 are housed inside the recess 101 with one surface 24 facing the opening surface of the recess 101. Further, the pair of electrode terminals 3 and 4 are connected to the side end surface of the positive temperature coefficient thermistor 2 and the other surface 2 in the thickness direction at one end.
5 are formed with spring parts 31, 41 which are pressed into contact with each other by a spring, and terminal parts 32, 42 which are continuously drawn out from the spring parts 31, 41 are formed. And the spring parts 31, 41 of these electrode terminals 3, 4
is the electrode 2 provided on the side wall surfaces 101a and 101b of the recess 101 and the side end surface of the positive temperature coefficient thermistor 2.
2 and 23, and the bottom surface 101c of the recess 101.
and the other surface 25 in the thickness direction of the positive temperature coefficient thermistor 2, and are brought into pressure contact with the electrodes 22, 23 using the contraction repulsive force of the spring parts 31, 41,
Apply spring pressure in the direction of the opening surface. As a result, one surface 2 that becomes the heat generating surface of the positive temperature coefficient thermistor 2
4 is connected to the heat dissipating surface 6 of the heat dissipating member 6 via the insulating plate 5.
1. The heat generated in the positive temperature coefficient thermistor 2 is transferred to the insulating plate 5.
The heat is transmitted to the heat radiating surface 61 of the heat radiating member 6 via.
Since the electrode terminals 3 and 4, which cause large heat loss, are not present in the heat transfer path, the heat transfer loss due to the electrode terminals 3 and 4 is reduced. As a result, the time required for the surface temperature of the heat radiation surface 61 to reach a predetermined temperature is shortened,
The rapid response is improved, and the temperature difference between the heat generation temperature of the PTC thermistor 2 and the surface temperature of the heat radiation surface 61 is reduced, and thermal efficiency is improved. Next, the effects of the present invention will be explained using data. <Example Sample> In the structure shown in FIGS. 1 and 2, the following was used as a positive temperature coefficient thermistor. Curie temperature 220°C Room temperature resistance R ₂₅ 1.8KΩ Dimensions Hexahedral shape of 8 x 4 x 3 m/m (Comparative example sample) In the structure shown in Figure 3, the following was used as a positive temperature coefficient thermistor. Curie temperature 220°C Room temperature resistance R ₂₅ 1.3KΩ Shape and dimensions Hexahedral shape of 8 x 4 x 3 m/m Table 1 shows the temperature characteristics and power consumption of the above example sample and comparative example sample.

[Table] FIG. 4 shows the time-temperature rise characteristics of the above example sample and comparative example sample. curve L ₁
is the characteristic of the example sample, and curve _L2 is the characteristic of the comparative example sample. In Table 1 and FIG. 4, the temperature is measured at the center of the surface of the heat dissipation surface 61. As is clear from the data in Table 1 and the characteristic diagram in Figure 4, the time required for the surface temperature of the heat dissipation surface 61 to reach 150°C in the example sample and the comparative example sample using positive temperature coefficient thermistors with approximately the same characteristics. Compared to 150 seconds for the comparative example sample, the example sample had 75 seconds, which was half that, and the temperature rise time characteristics were significantly improved. In addition, in the comparison of stable temperature, the example sample is 169.3 degrees Celsius, which is approximately 11 degrees Celsius higher than the comparative example sample's 157.7 degrees Celsius.
℃, indicating a high exothermic temperature.
This means that the heat generation temperature of the positive temperature coefficient thermistor 2 of the example sample and the comparative example sample is approximately the same, so the difference between the heat generation temperature of the positive temperature coefficient thermistor 2 and the surface temperature of the heat radiation surface 61 of the example sample is the comparative example. It is smaller than the sample, meaning it has higher thermal efficiency. Effects of the Invention As described above, the PTC thermistor device according to the present invention includes a heat-resistant insulating member having a concave opening on one side, electrodes on both end faces in the width direction, and one side in the thickness direction having an opening in the concave portion. a positive temperature coefficient thermistor housed in the recess facing toward the surface, and a pair of electrode terminals that press the positive temperature coefficient thermistor against the electrode from both end sides and apply spring pressure to press the positive temperature coefficient thermistor in the direction of the opening surface. and a heat dissipating member electrically insulated and thermally coupled to the PTC thermistor on the opening surface side of the recess, thereby increasing heat conduction efficiency from the PTC thermistor to the heat dissipating surface. A positive temperature coefficient thermistor device that improves quick response by shortening the time it takes for the temperature of the positive temperature coefficient thermistor to reach a predetermined temperature, and also improves thermal efficiency by reducing the difference between the heat generation temperature of the positive temperature coefficient thermistor and the surface temperature of the heat dissipation surface. can be provided.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a PTC thermistor device according to the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a cross-sectional view of a conventional PTC thermistor device, and Fig. 4 is an example sample and a comparative example sample. FIG. 2 is a time-temperature rise characteristic diagram. DESCRIPTION OF SYMBOLS 1... Insulating member, 101... Recessed part, 2... Positive temperature coefficient thermistor, 22, 23... Electrode, 3, 4...
Electrode terminal, 5... Insulating plate, 6... Discharge member, 61
...heat dissipation surface.

Claims (1)

[Scope of utility model claims] a heat-resistant insulating member having a recess opened on one surface; a positive temperature coefficient thermistor having electrodes on both end faces in the width direction and housed in the recess with one surface in the thickness direction facing the opening surface of the recess; and the positive temperature coefficient thermistor On the other hand, a pair of electrode terminals are pressed against the electrode from both ends and apply spring pressure to press in the direction of the opening surface, and a pair of electrode terminals are electrically insulated and heated to the positive temperature coefficient thermistor on the opening surface side of the recess. A positive temperature coefficient thermistor device comprising: a heat dissipating member to be coupled to the positive temperature coefficient thermistor device.