JPS58150238A - Sealed electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an encapsulated electromagnetic relay using a movable contact spring support plate that provides stable operating characteristics to the relay.

Figure 1 is a sectional view showing the configuration and operating principle of a typical enclosed electromagnetic relay, and Figure 2 is a partially enlarged perspective view of the movable contact spring support plate and movable contact spring used in Figure 1. It is.

1 and 2, 1 is a movable contact spring support plate made of a magnetic material such as 42% NiFe alloy, 2 is a movable contact spring fixed by welding to the movable contact spring support plate 1, and this movable contact As shown in FIG. 2, the spring 2 is integrally composed of a spring portion 21 made of a magnetic spring material and a noble metal contact portion 22 clad on the surface thereof.

A movable contact spring support plate 1 obtained by welding such a movable contact spring 2 at a spring welding part 12 is made of a movable contact spring support plate 1 which is a base body of a relay casing.
A metal terminal 6' which is hermetically sealed with glass 5 (glass hermetic seal) is fixed to a metal substrate 4 made of a magnetic material such as a 2% NiFe alloy by bath welding. Further, a fixed contact 3 is welded to a metal terminal B, which is located at a position opposite to the precious metal contact portion 22 of the movable contact spring 2, and forms a position opposite to the contact. 7 is a sealing cover, which is welded to the metal substrate 4 to maintain airtightness inside the switch. The iron core printed board is shown.

Now, by exciting the driving coil 9, the iron core 8 is magnetized, and the magnetic flux 11 as shown in FIG. → Iron core printed board 10 → Iron core 8 to form a magnetic closed loop. Due to the attractive force created by the magnetic flux 11 in the gap between the fixed contact 3 and the movable contact spring support plate 1, the movable contact spring 2 is moved toward the fixed contact 3 side with the spring weld 12 as the fixed end, as shown in FIG. 2 (b). It performs a decimal motion and makes contact with the fixed contact 6 to form a switching circuit. In this case, the iron core 8 functions as a signal terminal.

As mentioned above, in an encapsulated electromagnetic relay, each component is made of magnetic material and each functions as a magnetic circuit, so the movable contact spring support plate 1 and the movable contact spring 2 closely welded thereto However, due to the residual magnetic flux of the movable contact spring 2, the movable contact spring support plate 1 becomes like a yoke or a retainer, forming a minor magnetic loop as shown in FIG. 6 and 13.

This generates an attractive force f15 in the opposite direction to the attractive force F14 produced by the main magnetic flux 11. The magnitude of the reverse attraction force f depends on the magnitude of the residual magnetism of the movable contact spring 2, its shape, and the degree of contact with the movable contact spring support plate 1.

Although it depends on the contact position, etc., when the degree of closeness between the end of the movable contact spring contact part where magnetization is concentrated and the movable contact spring support plate increases, the movable contact spring 2, which normally moves in decimal order with respect to the fixed contact 6, This results in diagonal operation, which not only makes the operating characteristics of the spring extremely unstable, but also generates a reverse attraction force f that is so large that it impairs the switch function, that is, the movable contact spring 2 becomes inoperable. .

An object of the present invention is to provide an enclosed electromagnetic relay equipped with a movable contact spring support plate that eliminates these phenomena and allows stable switch operation.

In order to eliminate the above-mentioned reverse attraction force f, the movable contact spring support plate 1
It would be better to make the movable contact spring 2 a non-magnetic material and break the magnetic loop created by the residual magnetism of the movable contact spring 2, but in this case, the magnetic circuit of the entire relay would deteriorate, so the driving power would have to be significantly improved.Also, the movable contact spring support plate There is a method of adding a plating process to 1 and plating with non-magnetic metal such as copper to stabilize the operation, but the shape of the movable contact spring support plate 1 is extremely difficult to plate. It is economically disadvantageous because the method of applying plating to a uniform thickness is special.

In order to obtain a relay with stable operating characteristics, the present invention is characterized in that both sides of the base material of the movable contact spring support plate made of a magnetic material are clad with a non-magnetic metal material.

FIG. 4 shows an embodiment of the present invention. The movable contact spring support plate 16 has a magnetic material 170 such as a 42% NiFe alloy on both sides, and a non-magnetic metal material 18 with high corrosion resistance, such as a non-magnetic stainless steel copper plate, etc. W-? It can be obtained using a metal material clad with 304 or the like.

The reason why we selected a material with excellent corrosion resistance as the cladding material is that when the intermediate process from parts processing to assembly lasts for a long time, especially during the rainy season, we selected a material with excellent corrosion resistance, which is 42%, which is conventionally used. This is to prevent fine rust from forming on the surface of N1Ft alloy as well. In this case, OK 4 - The moving contact spring support plate 16 has a complete rust prevention effect.

The reason for cladding on both sides is to alleviate warping of the movable contact spring support plate caused by the difference in coefficient of thermal expansion between the base material and the cladding material.

FIG. 5 shows the relationship between the contact gap Xg and the sensing current value ratio (actual value/standard value) of the enclosed electromagnetic relay. The white dots are actual measured values for the conventional product, and the broken line A shows the regression line. Further, the black dots are actual measured current values of the relay according to the present invention, and the solid line B is its regression line. As shown in Fig. 5, in the case of the conventional product, changes in the moving current value are extremely sensitive to changes in the contact gap Xg due to the influence of the reverse attraction force generated between the movable contact spring 2 and the movable contact spring support plate 10. There is a large variation in the current value when looking at a specific contact gap.

For this reason, it is necessary to strictly control the size of the contact gap at the stage of manufacturing the relay, and it is necessary to strictly control the manufacturing tolerances of the individual components that make up the contact gap. Moreover, even with such a strictly controlled contact gap, there is a drawback that the yield of current value characteristics is extremely poor.

In the case of the relay using the movable contact spring support plate 16 of the present invention, the effect of the non-magnetic cladding material eliminates the generation of reciprocal attraction, which is the cause of the drawback of the conventional product, so that the regression line A of the conventional product In comparison, regression line B shows improved productivity.

In other words, the change in the sensing current value is slower than the change in the contact gap, and the variation with respect to the regression line B is reduced, making the control width of the contact gap approximately 1.5 times that of conventional products. can do. Therefore, it is possible to set the contact gap that satisfies the current value standard with a tolerance approximately 1.5 times the conventional setting value, and the strict manufacturing tolerances allocated to each component can be expanded to a level suitable for mass production. It has become possible. Furthermore, by eliminating the reciprocal attraction force, the diagonal movement of the movable contact spring that existed in the past is eliminated, and the cause of instability in the time value characteristics due to the extremely long chatter of the movable contact spring is eliminated.
A switch with stable time value characteristics can be obtained.

As explained above, the relay using the movable contact spring support plate manufactured from a metal material in which a magnetic material base material is clad on both sides with a non-magnetic material according to the present invention can expand the tolerance of each component constituting the contact gap. Furthermore, it has stable current values and operating characteristics.

In other words, an economically superior encapsulated electromagnetic relay can be obtained.

6(a) and 6(b) are a perspective view and an exploded perspective view of a relay encapsulating a plurality of contacts, which is an application example of the present invention. A movable contact spring support plate made of double-sided clad material is particularly effective for regulating purposes.

In addition, a relay having a movable contact spring support plate with high corrosion resistance can be obtained, and there is no need for anti-rust treatment such as plating.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view 7 of a typical enclosed electromagnetic relay. Figure 2 is an enlarged view of the movable contact spring support plate and movable contact spring part used in the relay shown in Figure 1, and Figure 6 is an explanatory diagram of the reciprocal attractive force generated between the movable contact spring support plate and the movable contact spring. , FIG. 4 is a cross-sectional view of a main part of an embodiment of the present invention, FIG. 5 is a diagram of the relationship between the contact gap and current value of an encapsulated electromagnetic relay, and FIG. 6 is an encapsulated multi-contact example of an application of the present invention. FIG. 2: Movable contact spring 6: Fixed contact 1 (S, 19: Movable contact spring support plate 17: Support plate base material 1st: Support plate clad material Patent attorney Sui 1) Interest 1. Miyukisuji Figure 1 (A) (B) 11 Snake 2 Figure (A) (B) Figure 3 (A) (B) Figure 4
Figure 5 Orange point falling in the sky ■Applicant NEC Corporation 5-33-1 Shiba, Minato-ku, Tokyo

Claims (1)

[Claims] In an enclosed type electromagnetic relay in which a movable contact spring welded and fixed to a movable contact spring support plate made of a magnetic material faces a fixed contact and is enclosed in a housing, the movable contact spring support plate is made of a magnetic material as a base. An encapsulated electromagnetic relay characterized in that it is constructed by cladding a non-magnetic metal material with high corrosion resistance on both sides.