JP2548866Y2 - Positive characteristic thermistor device - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a positive temperature coefficient thermistor device. The positive temperature coefficient thermistor is provided on both surfaces of the thermistor body with an insulating gap having no electrodes, and provided on the thermistor body. A silver-based electrode portion serving as an extraction electrode is provided at a position facing the insulating gap on the formed ohmic electrode, and an electrode terminal member is brought into contact with the silver-based electrode portion, and the silver-based electrode portion or the insulating gap portion is provided. By supporting the positive temperature coefficient thermistor in the above, the temperature of the electrode terminal member contact portion and the support portion is reduced, and the thermal deterioration and thermal conditions of the electrode lead portion, the support member and the electrode terminal member are reduced, and the electrode terminal member is And to provide a positive temperature coefficient thermistor device capable of maintaining good electrical contact.

<Prior Art> Positive-characteristic thermistor devices have been conventionally used as heat sources of various heat generating devices. When a positive temperature coefficient thermistor device is used to construct, for example, a clothes dryer, a dish dryer or a hot air heater, the positive temperature coefficient thermistor must be mechanically supported. However, since the PTC thermistor has a substantially uniform heat generation temperature over the entire area, the PTC thermistor must be supported in a high temperature state, and the heat resistance design becomes extremely strict. As a conventional technique for solving such a problem, there is an invention described in Japanese Patent Publication No. 61-6985. In this prior art, an insulating gap having no electrode is formed on a part of an electrode forming surface of a porcelain heating element, and a portion having the insulating gap is used as a support portion for supporting the porcelain heating element. It is designed to reduce the heat generation at the support portion of the body and prevent the adhesive from being thermally degraded and the support force from being reduced.

<Problem to be Solved by the Invention> However, in the above-described conventional positive temperature coefficient thermistor device, an electrode terminal member such as an electrode terminal member is directly contacted with an ohmic electrode formed on the surface of the thermistor body. Therefore, a sufficiently good electrical contact could not be obtained. This is because the ohmic electrode is formed as a metal sprayed electrode containing no silver component, for example, brass or aluminum in order to prevent silver migration, and the electrical conductivity is not so good.

Therefore, the problem of the present invention is to solve the above-mentioned conventional problems, to lower the temperature of the portion where the electrode terminal members are connected,
An object of the present invention is to provide a positive temperature coefficient thermistor device capable of alleviating thermal deterioration and thermal conditions of an electrode lead-out portion, a support member, and an electrode terminal member, and maintaining good electrical contact of the electrode terminal member.

<Means for Solving the Problems> In order to solve the above-described problems, the positive temperature coefficient thermistor device according to the present invention includes a positive temperature coefficient thermistor, an electrode terminal member, and a support member.

The positive temperature coefficient thermistor has electrodes on opposite surfaces of a quadratic thermistor body. The thermistor body has an insulating gap on each of the two surfaces where the electrode does not exist. Each of the insulating gaps
On both sides of the thermistor body facing each other, the thermistor body is formed at a position facing the electrode on the facing surface side.

Each of the electrodes has an ohmic electrode containing no silver component and a silver-based electrode portion serving as an extraction electrode. The ohmic electrodes are formed on both surfaces of the thermistor body except for the insulating gap. The silver-based electrode portion is partially provided on the ohmic electrode at a position facing the insulating gap.

The support member is made of an electrical insulator, and supports one surface of the positive temperature coefficient thermistor with the insulating gap and the silver-based electrode portion.

The electrode terminal member includes a first electrode terminal member, a holding member, and a second electrode terminal member. The first electrode terminal member is arranged so as to contact and press a silver-based electrode portion facing the insulating gap received by the support member on one side of the opposite sides of the thermistor body, Attached to the support member. The pressing member is disposed so as to contact and press the insulating gap opposed to the silver-based electrode portion received by the supporting member on the other side of the opposite side of the thermistor body, and the supporting member Mounted on The second electrode terminal member is disposed on the support member so as to contact the silver-based electrode portion received by the support member.

<Operation> Since each of the electrodes provided in the positive temperature coefficient thermistor has an ohmic electrode containing no silver component, occurrence of silver migration can be prevented.

In addition, since the silver-based electrode portion is partially provided on the ohmic electrode at a position facing the insulating gap, a position where the silver-based electrode portion is located does not become a heat generating region.
For this reason, the temperature of the silver-based electrode portion is lowered, and the electrode deterioration can be effectively prevented even when used in a heated fluid or atmosphere containing a corrosive gas. Since the silver-based electrode portion is partially provided on the ohmic electrode,
The electrode formation cost is reduced.

In addition, each of the silver-based electrode portions has the above configuration,
Since they are arranged at different positions on the thermistor element body, even if silver migration occurs, a short circuit between the electrodes hardly occurs.

The positive temperature coefficient thermistor has a square positive temperature coefficient thermistor body, and each of the insulating gaps is formed at a position facing the electrode on the opposing surface side on both sides of the thermistor body facing each other. In such a structure, the first electrode terminal member is arranged so as to contact and press against the silver-based electrode portion facing the insulating gap received by the support member on one side of the opposite sides of the thermistor body. It is attached to the member. The pressing member is disposed on the other side of the opposite sides of the thermistor body so as to contact and press the insulating gap facing the silver-based electrode portion received by the supporting member, and is attached to the supporting member. Therefore, the first electrode terminal member and the pressing member have a structure in which the positive temperature coefficient thermistor is pressed on both opposing sides, and the positive temperature coefficient thermistor can be securely mounted on the support member.
Good electrical contact of the electrode terminal member with the positive temperature coefficient thermistor can be maintained.

The first electrode terminal member is disposed so as to contact and press against the silver-based electrode portion facing the insulating gap received by the support member, and is attached to the support member.
Are disposed on the support member so as to contact the silver-based electrode portion received by the support member. According to this structure, the support member and the electrode terminal member
Both are coupled to the positive temperature coefficient thermistor at a low temperature portion. For this reason, thermal degradation and thermal conditions of the support member and the electrode terminal member are reduced. Moreover, since the electrode terminal member is arranged so as to be in contact with the surface of the silver-based electrode portion, it is possible to maintain good electrical contact of the electrode terminal member with the positive temperature coefficient thermistor.

<Example> FIG. 1 is a plan view of a positive temperature coefficient thermistor device according to the present invention, and FIG. 2 is an enlarged partial sectional view of the same. 1 is a positive temperature coefficient thermistor, 2 is a support member made of an electrical insulator, 3 and 4 are electrode terminal members, 5 is a pressing member, and 6 is an electrode terminal connection conductor.

Although two positive temperature coefficient thermistors 1 are provided in FIG. 1, one or three or more positive temperature coefficient thermistors 1 may be provided. Each of the positive temperature coefficient thermistors 1 has electrodes 12 and 13 on both opposing surfaces of a thermistor body 11, as shown in FIGS. The thermistor body 11 has a square plate shape,
On the electrode forming surface on which the electrodes 12 and 13 are provided, there are insulating gaps G1 and G2 in which the electrodes 12 and 13 do not exist. Insulation gap G1, G2
Are formed on opposite sides of the thermistor body 11 at positions facing the electrodes 13 or 12 on the other side. That is, the insulating gap G1 on the same surface as the electrode 12 overlaps the electrode 13 on the other surface, and the insulating gap G2 on the same surface as the electrode 13 overlaps the electrode 12 on the other surface.

Each of the electrodes 12 and 13 has ohmic electrodes 121 and 131 containing no silver component and silver-based electrode portions 122 and 1 serving as extraction electrodes.
32. The ohmic electrodes 121 and 131 are formed on both surfaces of the thermistor body 11 so as to define insulating gaps G1 and G2. The ohmic electrodes 121 and 131 form an ohmic contact with the thermistor body 11. Specifically, it is a spray electrode of brass or aluminum.
Therefore, there is no room for silver migration to occur in the ohmic electrodes 121 and 131.

The silver-based electrode portions 122 and 132 are formed as silver paste firing electrodes. The silver-based electrode portions 122 and 132
On portions 1 and 131, they are partially provided at positions facing the insulating gaps G1 and G2. The silver-based electrode portion 122 provided on the ohmic electrode 121 is located at a position facing the insulating gap G2, and the silver-based electrode portion 132 provided on the ohmic electrode 131 is provided at a position facing the insulating gap G1. ing. The illustrated silver-based electrode portions 122 and 132 are formed smaller by ΔS1 and ΔS2 than planes S1 and S2 of the insulating gaps G1 and G2 so as to be included in the planes of the opposing insulating gaps G1 and G2.

Since the silver-based electrode portions 122 and 132 are partially provided on the ohmic electrodes 121 and 131 at positions facing the insulating gaps G1 and G2, the position of the silver-based electrode portions 122 and 132 is a heating region. Does not. Therefore, the silver-based electrode portion 12
The temperatures of 2, 132 are reduced, and electrode deterioration is prevented. Especially,
In the case where the atmosphere contains a corrosive gas such as chlorine which causes metal corrosion, if the three conditions of high temperature, silver component and corrosive gas are prepared, the corrosion deterioration reaction of the silver-based electrode portions 122 and 132 is promoted. However, according to the present invention, among the three conditions, the high-temperature condition is eliminated, so that metal corrosion of the silver-based electrode portions 122 and 132 is suppressed.

Description will be made with reference to FIGS. 1 and 2 again. The support member 2 receives the positive temperature coefficient thermistor 1 at one side of the positive temperature coefficient thermistor 1 at the silver-based electrode portion 122 and the insulating gap G1. Therefore, the support member 2 supports the PTC thermistor 1 at a portion where the temperature is low. For this reason, thermal degradation and thermal conditions of the support member 2 are alleviated.
The support member 2 is made of heat-resistant plastic, ceramic, or the like. Although illustrated as a single component, it may be divided into a plurality of pieces.

The electrode terminal members 3 and 4 include a first electrode terminal member 3 and a second electrode terminal member 4. These electrode terminal members 3 and 4 are made of a thin metal plate such as stainless steel. The first electrode terminal member 3 has a silver-based electrode portion 132 facing the insulating gap G1 received by the support member 2.
And is attached to the support member 2. Therefore, the first electrode terminal member 3 is also used as a pressing member. Reference numeral 7 denotes a stopper such as a screw for fixing the first electrode terminal member 3 to the support member 2.

The pressing member 5 is disposed so as to face the second electrode terminal member 4, and comes into contact with the insulating gap G2 facing the silver-based electrode portion 122 with which the second electrode terminal member 4 is in contact,
The positive temperature coefficient thermistor 1 is attached to the support member 2 so as to press it against the second electrode terminal member 4 and the support member 2.
The holding member 5 can be made of the same material as the electrode terminal members 3 and 4. Reference numeral 8 denotes a stopper such as a screw for fixing the holding member 5.

The second electrode terminal member 4 is supported by the supporting member 2 so as to contact the silver-based electrode portion 122 received by the supporting member 2.
Is placed on top.

As described above, the positive temperature coefficient thermistor has a square positive temperature coefficient thermistor body 11, and each of the insulating gaps G1 and G2 is located on opposite sides of the thermistor body 11,
It is formed at a position facing the electrode on the facing surface side. In such a structure, the first electrode terminal member 3 is in contact with the silver-based electrode portion 132 facing the insulating gap G1 received by the support member 2 on one side of the opposite side of the positive temperature coefficient thermistor body 11. It is arranged to be pressed and attached to the support member 2. Further, the pressing member 5 is arranged so as to contact and press the insulating gap G2 facing the silver-based electrode portion 122 received by the supporting member 2 on the other side of the opposite side of the positive temperature coefficient thermistor body 11. , Mounted on the support member 2. Therefore, the positive electrode thermistor 1 is held down on both opposing sides by the first electrode terminal member 3 and the pressing member 5, so that the positive electrode thermistor 1 can be securely mounted on the support member 2. The electrical contact of the electrode terminal members 3, 4 with the positive temperature coefficient thermistor 1 can be kept good.

The first electrode terminal member 3 is attached to the support member 2 so as to be in contact with and press against the silver-based electrode portion 132 facing the insulating gap G1 received by the support member 2, and is attached to the second electrode terminal. The member 4 is disposed on the support member 2 so as to contact the silver-based electrode portion 122 received by the support member 2. According to this structure, the support member 2 and the electrode terminal members 3 and 4 are both coupled to the positive temperature coefficient thermistor at a low temperature portion. For this reason,
Thermal degradation and thermal conditions of the first electrode terminal member 3 and the second electrode terminal member 4 are alleviated. Moreover, the silver-based electrode part
Because it is arranged to contact the surface of 122, 132,
Good electrical contact with the positive temperature coefficient thermistor 1 can be maintained.

Moreover, since the pressing member 5 is in contact with the insulating gap G2, the pressing member 5 is coupled to the positive temperature coefficient thermistor 1 at a low temperature portion. For this reason, thermal degradation and thermal conditions of the holding member 5 are also alleviated.

FIG. 5 shows another embodiment of the heat generating device according to the present invention. In the drawings, the same reference numerals as those in FIGS. 1 and 2 indicate the same components. The positive temperature coefficient thermistor 1 has a honeycomb shape having a large number of through-holes 111 penetrating in the direction of the electrode forming surface of the thermistor element body 11, and an arrow a indicates the passage direction of the fluid to be heated. The fluid to be heated is generally air, but is air containing chlorine in consideration of, for example, use as a dish dryer. Even with a fluid containing such a corrosive gas, electrode deterioration can be prevented as described above.

FIG. 6 shows still another embodiment of the heating device according to the present invention. The positive temperature coefficient thermistor 1 has a honeycomb shape as described in FIG. 5, and at least one of the electrodes 12 and 13, for example, the electrode 12 is covered with the resin 9 except for the silver-based electrode portion 122. The resin 9 is made of a weather-resistant resin such as silicone varnish or silicone rubber. Since the electrode 12 covered with the resin 9 has substantially no exposed portion, even when the electrode 12 is used in a clothes dryer or a dish dryer, erosion of the electrode 12 by a corrosive gas such as chlorine gas is suppressed, and reliability is improved. The performance is improved. It is particularly effective to make the resin 9 adhere to the hot air outlet side. This is because the hot air outlet side becomes high temperature, and particularly in the case of an atmosphere containing a corrosive gas or an object to be heated, electrode deterioration is likely to occur.

<Effects of the Invention> As described above, according to the present invention, the following effects can be obtained.

(A) A positive temperature coefficient thermistor device capable of preventing occurrence of silver migration can be provided.

(B) A positive temperature coefficient thermistor device with low electrode formation cost can be provided.

(C) It is possible to provide a positive temperature coefficient thermistor device capable of effectively preventing electrode deterioration even when the temperature of the silver-based electrode portion is lowered and the device is used in a heated fluid or atmosphere containing a corrosive gas.

(D) Even if silver migration occurs, it is possible to provide a positive temperature coefficient thermistor device that does not cause a short circuit between electrodes.

(E) It is possible to provide a positive temperature coefficient thermistor device capable of alleviating thermal deterioration and thermal conditions of the support member and the electrode terminal member and maintaining good electrical contact of the electrode terminal member with the positive temperature coefficient thermistor.

[Brief description of the drawings]

FIG. 1 is a plan view of a positive temperature coefficient thermistor device according to the present invention,
FIG. 2 is an enlarged partial cross-sectional view, FIG. 3 is a front cross-sectional view of a PTC thermistor constituting the PTC thermistor device according to the present invention, FIG. 4 is a plan view thereof, and FIG. FIG. 6 is a partial sectional view of another embodiment of the positive temperature coefficient thermistor device, and FIG. 6 is a partial cross sectional view of still another embodiment of the positive temperature coefficient thermistor device according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Positive characteristic thermistor 11 ... Thermistor body 12, 13 ... Electrode 121, 131 ... Ohmic electrode 122, 132 ... Silver-based electrode part 2 ... Support member 3, 4 ... Electrode terminal member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazushi Saito 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) References Japanese Utility Model Sho-61-15704 (JP, U) Japanese Utility Model Hei 1 −92792 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A positive temperature coefficient thermistor device comprising a positive temperature coefficient thermistor, an electrode terminal member, and a support member, wherein said positive temperature coefficient thermistor has electrodes on opposite sides of a square thermistor body. The thermistor body has an insulating gap where the electrode does not exist on each of the two surfaces, and each of the insulating gaps is located on an opposing surface side on opposite sides of the thermistor body. Each of the electrodes has an ohmic electrode containing no silver component and a silver-based electrode portion serving as an extraction electrode, and the ohmic electrode has an insulating gap. And the silver-based electrode portion is located on the ohmic electrode and opposed to the insulating gap. The support member is made of an electrical insulator, and supports one surface side of the positive temperature coefficient thermistor with the insulating gap and the silver-based electrode portion. A first electrode terminal member, a pressing member, and a second electrode terminal member, wherein the first electrode terminal member is provided on one side of the opposite sides of the thermistor body. The insulating member is disposed so as to come into contact with and press against the silver-based electrode portion facing the insulating gap, and is attached to the supporting member. The pressing member is located on the other side of the opposite sides of the thermistor body. Wherein the second electrode is disposed so as to contact and press against the insulating gap facing the silver-based electrode portion received by the support member, and is attached to the support member. The positive temperature coefficient thermistor device, wherein the pole terminal member is disposed on the support member so as to contact the silver-based electrode portion received by the support member.