JPH02241002A - Positive temperature coefficient thermister device - Google Patents

Abstract

PURPOSE:To obtain a device wherein the temperature rise characteristics of a heat radiating part is excellent, the amount of heat dissipation is sufficient, damage is little, and sealing is superior, by accommodating the following in an U-shaped insulating case; a positive temperature coefficient thermistor of a plane-view U-shape provided with electrodes on the surface and the back, and two U-shaped electrode plates abutting against the electrodes. CONSTITUTION:The title device is provided with the following; a positive temperature coefficient thermister 11 of plane-view U-shape having electrodes on the surface and the back, two U-shaped electrode plates 12, 13 pinching the positive temperature coefficient thermister 11 of U-shape from the upper and the lower parts so as to abut against the above electrodes, a U-shaped insulating case 14 accommodating them, a U-shaped heat radiating plate 15 arranged on a U-shaped aperture of the the insulating case 14, and filler 16 filling the case 14. For example, the positive temperature coefficient thermister 11 of U-shape is arranged so as to be closely in contact with the side of a U-shaped aperture part 14c formed in the insulating case 14. When a voltage is applied to the U-shaped electrode plates 12, 13, the voltage is applied to the positive characteristic thermister 11 of U-shape, which generates heat and keeps a constant temperature. The heat is conducted to a heat radiating plate 15, and an object to be heated is heated by radiated heat from the heat radiating plate 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to, for example, a liquid-type electric mosquito repellent that dissipates insecticidal gas from three rods by heating the outer periphery of three rods impregnated with insecticidal liquid. The present invention relates to a positive temperature coefficient thermistor device used in a heating device suitable for heating a rod-shaped or pipe-shaped object to be heated.

A conventional positive temperature coefficient thermistor is a semiconductor ceramic whose resistance value rapidly increases when the temperature exceeds a certain temperature (Curie temperature). Therefore, this positive characteristic thermis!
generates heat when voltage is applied, and when it exceeds the Curie temperature,
The temperature rise is stopped and a constant temperature is maintained. In this way, positive characteristic thermis! It is widely used as a safe heat source and heat source that does not overheat. For example, in a heating transpiration insecticide that heats and evaporates the insecticidal liquid by immersing a part of the porous liquid-absorbing wick in the insecticidal liquid,
For the heating evaporation, a thermistor device having a U-shape in plan view is used. FIG. 4 shows a typical U-shaped positive temperature coefficient thermistor device. The positive temperature coefficient thermistor 1 has a rectangular shape and is sandwiched between an L-shaped electrode plate 2 and a spring electrode plate 3 having an arcuate portion 3a. It is stored in a storage recess 5b formed on the opposite side of the shaped notch 5a with an insulating plate 4 interposed therebetween, and the internal space of the storage recess 5b is closed by a lid 6. The positive temperature coefficient thermistor l is elastically pressed against the electrode plate 2 by the biasing force of the circular arc-shaped portion 3a of the spring electrode plate 3.
The end of the spring electrode plate 3 is taken out through the lid 6 and used as a terminal.

Problems to be Solved by the Invention However, as shown in FIG. 4, the U-shaped positive characteristic is a mistake! In the device, due to the structure in which the heat dissipation member 5 and the positive temperature coefficient thermistor 1, which is a heating element, are separated, the heat dissipation member 5
The temperature increase characteristics of the heat dissipating member 5 are poor, the surface temperature of the heat dissipating member 5 varies, and the loss is large.

Furthermore, since the positive temperature coefficient thermistor l, which is a heating element, is smaller than the heat dissipating member 5, it is preferable to obtain a sufficient amount of heat dissipation.

In addition, since the structure uses the spring electrode plate 3 for both mechanical and electrical connection, it is vulnerable to external forces and is prone to breakdowns. In addition, since the airtightness is low, it is strongly affected by the influence of the external environment such as humidity, leading to problems such as accelerated deterioration of performance.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a positive temperature characteristic thermistor device that has good temperature rise characteristics in the heat dissipation part, can obtain a sufficient amount of heat dissipation, is difficult to cause failures, and is airtight. That is.

Means to solve the problem above problem? In order to solve this problem, the present invention provides a positive temperature coefficient thermistor having a U-shape in plan view with electrodes provided on the upper and lower surfaces, two ribbon-shaped electrode plates that come into contact with the electrodes and sandwich the U-shaped positive coefficient thermistor, and the like. The device includes a U-shaped insulating case for housing, a U-shaped heat dissipation plate provided on the U-shaped opening surface of the insulating case, and a filler filled in the insulating case.

Effect According to the above structure, when a voltage is applied to the two U-shaped electrode plates, the voltage is applied to the PTC thermistor, which generates heat, maintains a certain temperature, and connects the PTC thermistor to the heat sink via the insulating case. It transmits heat and heats a rod-shaped or pipe-shaped object by radiating heat from the heat sink. This heating element is a positive temperature coefficient thermist! The is configured in a U-shape and is installed close to the heat sink, so the heat generated by the positive temperature coefficient thermistor can be quickly transferred to the heat sink without wasting it.
It is possible to improve the temperature increase characteristics of the heat sink surface temperature, suppress variations in the surface temperature, and reduce loss. Also,
A positive temperature coefficient thermistor is sandwiched between two U-shaped electrode plates and housed in a U-shaped insulating case, which is filled with filler, making it extremely stable against external forces and the external environment. Highly reliable.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1, 2, and 3.

FIG. 1 is a cross-sectional view of a positive temperature coefficient thermistor device showing an embodiment of the present invention, and FIG. 2 is an external perspective view of the positive temperature coefficient thermistor device. As shown in FIGS. 1 and 2, the positive temperature coefficient thermistor 11 has a U-shape in plan view, and electric currents (not shown) are applied to the upper and lower surfaces. This U-shaped positive temperature coefficient thermistor 11 is sandwiched from above and below by two U-shaped receiving electrode plates 12.13, and the U-shaped collecting electrode plates 12.13 are in contact with the electrodes of the U-shaped positive temperature coefficient thermistor 11. . These U-shaped positive temperature coefficient thermistor 11 and U-accepting electrode plates 12 and 13 are housed in a U-shaped insulating case 14 consisting of a U-shaped case body 14a with an open bottom surface and a U-shaped lid portion 14b that closes the bottom surface. ing. U-shaped positive temperature coefficient thermistor 11 is insulated case 1
A U-shaped heat dissipation plate is disposed closely on the side of the U-shaped opening 14c provided in the insulating case 14 through the wall of the U-shaped opening 14c of the insulating gate 14. 15
is installed. Further, the insulating case 14 is filled with a filler 16, and one ends of the U-accepting electrode plates 12, 13 are respectively taken out from the U-shaped lid portion 14b of the insulating case 14 and used as terminals.

In the above configuration, when a voltage is applied to the two U-accepting electrode plates 12 and 13, a voltage is applied to the U-shaped positive temperature coefficient thermistor 11, which generates heat and maintains a certain temperature, and the insulating case 14 Transfers heat to the heat sink through
The object to be heated is heated by heat radiation from the heat sink 15. Here, the PTC thermistor 11, which is the heating element, is configured in a U shape and is installed close to the heat sink 15 via the insulating case 14, so that the heat generated by the U-shaped PTC thermistor 11 is absorbed. Is there a temperature increase characteristic of the surface temperature of the heat sink that can be quickly transmitted to the heat sink 15 without waste? It is possible to improve the surface temperature, suppress variations in surface temperature, and reduce loss. Also, the U-shaped positive characteristic is a mistake! 111 Two U-shaped electrode plates 12 and 13 sandwich the U-shaped insulating r-space 1.
4 and filled with filler 16,
Extremely stable and highly reliable against external forces and external environments.

Next, FIG. 1 shows an external perspective view of an embodiment of a positive temperature coefficient thermistor device that does not use a U-shaped lid. The positive temperature coefficient thermistor device shown in FIG. 3 has the same structure as that shown in FIGS. 1 and 2, but only the structure of the insulating case 24 differs, so this point will be explained below. This insulating case 24 has a U-shaped heat dissipation structure, and includes a U-shaped case main body 24a with an open surface opposite to the U-shaped opening 24c in which the plate 25 is provided, and a rectangular lid portion 24b that closes this surface. , U-shaped electrode plate 22.
One end of each of the terminals 23 is taken out from the rectangular lid portion 24b and used as a terminal.

With this configuration, the rectangular opening of the insulating canister 24 to which the rectangular lid 24b is attached can be kept away from the insecticidal liquid evaporating section, and the υ-shaped r-space body 24a and the rectangular lid 24
The dimension of the joint with b is reduced, the degree of sealing is improved, and it is possible to prevent the evaporated gas from entering the insulating case 24, thereby preventing performance deterioration of the U-shaped positive temperature coefficient thermistor due to the evaporated gas. can.

As described above, according to the present invention, the temperature increase that occurs due to the structure in which the heat dissipation member of the conventional U-shaped PTC thermistor device and the PTC thermistor, which is the heating element, are separated can be avoided. The poor characteristics, variations in the surface temperature of the heat dissipation section, and the large amount of loss are eliminated because the heat dissipation plate and the U-shaped positive temperature coefficient thermistor are placed in close proximity. In addition, in the past, it was difficult to obtain a sufficient amount of heat radiation because the PTC thermistor was small compared to the heat dissipation member, but a U-shaped PTC thermistor that has a sufficient size for the area of the U-shaped heat dissipation plate is used, this problem is also resolved. In addition, the conventional structure used a spring electrode plate for both mechanical and electrical connection, which was prone to failure, but it is now possible to insulate by storing it in an insulating case and filling it with filler. Since the structure is mechanically connected to the case, it has strong resistance to external forces and is highly reliable.In addition, the sealing performance is dramatically improved and the influence of the external environment is reduced, resulting in improved performance. Effects such as being able to prevent deterioration can be obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view of a positive temperature coefficient thermistor device showing one embodiment of the present invention, Fig. 2 is an external perspective view of a regenerative coefficient thermistor device, and Fig. 3 is a cross-sectional view of a positive temperature coefficient thermistor device showing an embodiment of the present invention. An external perspective view of a PTC thermistor device showing an embodiment, and FIG. 4 is a sectional view of a conventional PTC thermistor device. 11... U-shaped positive temperature coefficient thermistor, 12.13, 22.
23... U-shaped electrode plate, 14.24... Insulating case,
14a, 24a... U-shaped case body, 14b...
U-shaped lid part, 15.25... U-shaped heat sink, 16... Filler, 24b... Rectangular lid part. Agent Yoshihiro Morimoto Figure 1//-U4 entry'correct 1tu-Mr./2. /3-...U→Ku heavy desire 14...Riko-su /4z,...4 U selection case books, /4b□...U board part 1 t3...υ Cooking fever Fierce, it...-Filled 1 Fig. 2 Fig. 3 Fig. 3 = U plate heated up, Fig. 4 a

Claims (1)

[Claims] 1. A positive temperature coefficient thermistor that is U-shaped in plan view with electrodes provided on the upper and lower surfaces, two U-shaped electrode plates that come into contact with the electrodes and sandwich the U-shaped positive temperature coefficient thermistor from above and below, and a U-shaped positive temperature coefficient thermistor that houses them. A positive temperature coefficient thermistor device comprising an insulating case, a U-shaped heat sink provided on a U-shaped opening surface of the insulating case, and a filler filled in the insulating case.