JPH08255541A - Electric switch - Google Patents

Abstract

(57) [Summary] [Purpose] Not only can welding of contacts be prevented even when used under heavy load, but contact wear can also be reduced and contact reliability can be improved at low cost. [Structure] One of the fixed contact 3 and the movable contact 7 is made of a material having an electric conductivity of 40 to 70%, for example, DIN 17666. In addition to this,
One of the fixed contact 8 and the movable contact 9 is made of a material having an electric conductivity of 90 to 110%, for example, Ag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric switch such as a relay or a switch used with a large load such as a power relay.

[0002]

2. Description of the Related Art An electric switch of this type has fixed and movable contacts and fixed and movable contacts that can be opened and closed with respect to each other. However, conventional general electric switches have a fixed contact structure. In many cases, brass such as C2801 is used as the material, and phosphor bronze such as C5191 is used as the constituent material of the movable contact. As for the electrical contacts, the fixed and movable contacts facing each other should be AgCdO or AgS.
Often made of the same material such as nO ₂ .

[0003]

However, in an electric switch having a contact made of a combination of constituent materials as described above, when used under a large load, the heat generated when energized is large, and the heat generated when the contact is opened and closed. There has been a problem that the amount of contact consumption due to energy is large, and as a result, a contact failure is likely to occur, and further, the contacts are welded together and cannot perform a predetermined function. This is also the case when both contacts are made of the same material as described above, and the service life of the electric switch as a whole is reduced.

The present invention has been made in view of the above circumstances, and the contact wear amount is reduced by selecting the contactor or the contactor and the contact material, and the contact reliability is improved and the service life is extended at low cost. An object is to provide an electric switch which can be.

[0005]

In order to achieve the above object, an electric switch according to the invention of claim 1 has either one of a fixed contact and a movable contact having an electric conductivity of 40 to 70%.
It is composed of materials.

In the electric switch, the contact made of the material having the electric conductivity of 40 to 70% is preferably a movable contact as in claim 2, and more specifically, It is desirable that the fixed contact is made of brass and the movable contact is made of DIN 17666 as in No. 3.

In the electric switch according to a fourth aspect of the present invention, one of the fixed and movable contacts is made of a material having an electric conductivity of 40 to 70%, and any one of the fixed and movable contacts. One has an electrical conductivity of 90-1
It is composed of 10% of material.

In the electric switch, the contact made of the material having the electric conductivity of 40 to 70% is a movable contact and the electric conductivity of 9 is satisfied.
It is preferable that the contact composed of a material of 0 to 110% is a movable contact. Specifically, as in claim 6, the contact material having an electrical conductivity of 90 to 110% is Ag, and the other contact material. Is preferably AgCdO (Cd: 5 to 15 wt%) or AgSnO ₂ (Sn: 5 to 15 wt%).

[0009]

According to the first to third aspects of the present invention, since either one of the fixed contact and the movable contact is made of a highly conductive material having an electric conductivity of 40 to 70%, heat generation during energization is suppressed. As a result, the thermal energy at the time of opening and closing the contact is reduced, and in addition to causing no welding, the amount of wear of the contact is very small, and it is possible to maintain good contact reliability for a long period of time. In particular, by using the above-mentioned highly conductive material as the constituent material on the movable contact side, it is possible to significantly reduce the amount of contact wear regardless of the contact material.

According to the inventions of claims 4 to 6, one of the contacts is made of a highly conductive material having an electric conductivity of 40 to 70%, and one of the contacts is electrically connected. Since it is made of a material having a higher conductivity than the above contact in the range of conductivity of 90 to 110%, the electrical resistance from the contact to the contact at the time of energization is also very small, and the consumption of the contact is remarkable. As a result, the contact reliability and the service life of the electric switch as a whole can be further improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing the structure of an electromagnetic relay as an electric switch according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a base portion, and an input terminal 2 and a fixed contactor 3 serving as an output terminal are Inserted and fixed. A movable piece 4 made of a magnetic material is swingably attached to the tip of the fixed arm 6 and is driven and swung by an electromagnet 5, and a movable contact 7 made of a spring material is held on the movable piece 4. ing. Reference numeral 8 denotes a fixed contact fixed to the tip of the fixed contact piece 3, and a movable contact 9 which can be opened and closed with respect to the fixed contact 8 is attached to the tip of the movable contact 7. Reference numeral 10 denotes a case fitted to the base portion 1 so as to enclose the above-mentioned constituent members.

In the electromagnetic relay 11 having the above structure, the fixed contact 3 is represented by C2801, and the movable contact 7 is represented by DIN 17666, while the movable contact 7 is composed of brass having an electric conductivity of 28%. 63% conductivity
It is composed of the metal material of. In addition, DIN17
666 is a metal material number and symbol according to German Federal Standard.

FIG. 2 is a vertical sectional view showing the structure of a switch as an electric switch according to another embodiment of the present invention. In FIG. 2, reference numeral 12 is a switch case molded from an electrically insulating resin, The fixed contactor 13 and the common terminal 14 which are input terminals are inserted and fixed, and the switch operation button 15 is slidably held. Reference numeral 16 denotes a movable contactor made of a spring material that responds to the operation of the switch operation button 15, and a movable contact 17 is attached to the tip of the movable contactor. 18 is the movable contact 1
It is a fixed contact that can be opened and closed with respect to 7, and is fixed to the tip of the fixed contactor 13.

In the switch 19 having the above-mentioned structure, the fixed contact 13 is represented by C2801, and the movable contact 16 is represented by DIN 17666, which is made of brass having an electric conductivity of 28%. Degree 6
It is composed of 3% metal material.

The fixed contact 8 in each of the above embodiments,
As a constituent material of 18 and the movable contacts 9 and 17, both AgCdO (Cd: 12 wt% composition) may be used, or both may be AgSnO ₂ (Sn: 12 wt% composition).
May be used. Here, the characteristics of the various constituent materials appearing in the above description, that is, the electrical conductivity are summarized in a table as shown in Table 1.

[0016]

[Table 1]

Next, as in the above embodiments, the fixed contacts 3, 13 are made of C2801, and the movable contacts 7, 16 are made of DIN 17666. , Fixed contact is C280
A conventional electric switch composed of No. 1 and a movable contact made of C5191 was tested for the effect of improving the degree of wear by changing the contact material. In this test, both the fixed contact and the movable contact of both electric switches under test were made of AgCdO (Cd: 12 wt% composition), and both of them were made of AgSnO ₂ (Sn: 12 wt%).
% Composition), and the test conditions were DC 30 V, 8 A, L / R load, and the contacts were opened and closed 60,000 times. The test results are shown in Table 2. In addition, in Table 2, corresponds to a product of the present invention, and corresponds to a conventional product.

[0018]

[Table 2]

As is clear from Table 2, the movable contact is
In the case of the contact material of AgCdO, which is composed of IN17666, the consumption amount is reduced to about 2/3 as compared with the conventional product, and when the contact material is AgSnO ₂ , it is found in the conventional product. There is no such welding.

Further, in the present invention, in the electromagnetic relay 11 shown in FIG. 1 and the switch 19 shown in FIG. 2, the fixed contacts 3 and 13 are made of C2801, and the movable contacts 7 and 16 are made from DIN 17666. The fixed contacts 8 and 18 and the movable contacts 9 and 17
As a constituent material of, AgCdO having an electric conductivity of 75% and Ag having an electric conductivity of 106% are used in combination,
Alternatively, by using AgSnO ₂ having an electric conductivity of 70% and Ag in combination, the effect of improving the degree of contact wear can be further enhanced. Similar tests were conducted on the effect of improving the degree of wear by changing the materials of the example products in which the contact and contact materials were both changed as described above and the above-described conventional electric switch. The results are shown in Table 3, and in Table 3
Corresponds to the product of the embodiment of the present invention, and corresponds to the conventional product.

As is clear from Table 3, in the case of the embodiment example of the present invention, in which the contact material is AgCdO / Ag, the consumption amount is reduced to 1/2 or less as compared with the conventional product, and the contact point is reduced. Even in the case of the example product 'made of Ag / AgCdO, the consumption amount is remarkably reduced as compared with the conventional product, and in the case of the contact example material of AgSnO ₂ / Ag, the consumption amount is 1 compared to the conventional product. / 3 or less, contact material is A
Also in the case of the example product 'of g / AgSnO ₂ , the consumption amount was remarkably reduced as compared with the conventional product. Among these, it is preferable to use Ag as the movable contact material, and in particular, among the embodiments, the contact material of the embodiment is Ag / AgSnO ₂
In this case, the consumption amount can be minimized.

In each of the above embodiments, the movable contactor 7,
Although the case where DIN 17666 is used as the constituent material on the 16th side has been described, DIN 17666 may be used as the constituent material on the fixed contacts 3 and 13 side. Further, DIN17666 is shown in the above embodiment as an example of the material having the electric conductivity of 40 to 70%.
A (Copper Development Association: USA) number is C19260 (trade name ML-21 manufactured by Mitsubishi Metal Industries;
Electric conductivity 72%), C50500 (trade name C505 manufactured by Harada Shindoh Co., Ltd .; electric conductivity 43%), or trade name BeCu11 (electric conductivity 55%) manufactured by NGK Insulators may be used.

Further, the present invention can be applied to electric switches such as relays and switches having any structure other than the relays and switches having the structures shown in the above-mentioned embodiments, and the same effect as that of the above-mentioned embodiments can be obtained. Is played.

[0024]

As described above, according to the inventions of claims 1 to 3, either one of the fixed and movable contacts is made of a highly conductive material having an electric conductivity of 40 to 70%. Even when used under heavy load, heat generation due to energization is suppressed and the thermal energy at the time of contact opening / closing can be reduced. Therefore, the contact reliability can be favorably maintained for a long period of time, and the service life can be extended. In particular, by using the above-mentioned highly conductive material as the constituent material on the movable contact side, it is possible to significantly reduce the amount of contact wear regardless of the contact material.

According to the inventions of claims 4 to 6, one of the contacts is made of a highly conductive material having an electric conductivity of 40 to 70%, and one of the contacts is electrically connected. Since it is made of a material having a higher conductivity than the contact in the range of conductivity of 90 to 110%, when it is used under a large load, the electric resistance from the contact to the contact when energized is also extremely small, It is possible to significantly reduce the amount of contact wear and to further improve the contact reliability and service life of the electric switch as a whole.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an overall configuration of an electromagnetic relay as an electric switch according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an overall configuration of a switch as an electric switch according to another embodiment of the present invention.

[Explanation of symbols]

 3,13 Fixed contact 7,16 Movable contact 8,18 Fixed contact 9,17 Moving contact

[Table 3]

Claims (6)

[Claims] 1. An electric switch provided with a fixed and movable contact and a fixed and movable contact that can be opened and closed with respect to each other.
An electric switch which is made of a material having an electric conductivity of 40 to 70%. 2. The electric switch according to claim 1, wherein the movable contact is made of the material having an electric conductivity of 40 to 70%. 3. The electric switch according to claim 1, wherein the fixed contact is made of brass and the movable contact is made of DIN 17666. 4. An electric switch comprising a fixed and movable contact and a fixed and movable contact which can be opened and closed with respect to each other, wherein one of the fixed and movable contact has an electric conductivity of 40 to 70. % Composed of materials,
An electric switch, wherein one of the fixed and movable contacts is made of a material having an electric conductivity of 90 to 110%. 5. A movable contact is made of the material having an electrical conductivity of 40 to 70%, and a movable contact is made of the material having an electrical conductivity of 90 to 110%. An electric switch according to claim 4. 6. The contact material having an electric conductivity of 90 to 110% is Ag, and the other contact material is AgCdO (C
d: 5 to 15 wt%) or AgSnO ₂ (Sn: 5
15 wt%).