JPS6344261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reed relay.

[Conventional technology]

Generally, reed relays have a problem in that their emotional characteristics change due to the influence of temperature. That is,
In a polarized reed relay that uses a permanent magnet, the coil resistance changes by 0.39%/℃ due to temperature changes, but the residual magnetic property of permanent magnets is -0.19% for ferrite magnets, so a certain degree of temperature compensation is required. is possible, but not sufficient. For example, in the case of high temperatures, the coil resistance increases and the ampere turns of coil excitation decreases, resulting in a higher operating voltage. On the other hand, since the residual magnetism of the permanent magnet decreases, the strength of the permanent magnet decreases and the operating voltage decreases, but sufficient compensation cannot be achieved because the ratio between the coil resistance and the permanent magnet is unbalanced.

To deal with this, a reed piece and an auxiliary plate for deflecting the reed piece are provided between a pair of magnets, and the operating voltage is reduced with respect to temperature changes by canceling out the temperature dependence of both the magnetic flux of the pair of magnets and the magnetomotive force of the electromagnet. There were reed relays that prevented fluctuations (for example,
−110462).

[Problem to be solved by the invention]

However, this reed relay requires a pair of magnets and is complicated to assemble.

Therefore, an object of the present invention is to provide a reed relay that can perform temperature compensation without increasing the number of permanent magnets and is easy to assemble.

[Means to solve the problem]

The reed relay of the present invention supports a base end of a lead having spring properties, and has one end of a pair of magnetic pole plates facing each other in the operating direction of the lead with the free end of the lead in between, and the other end of the magnetic pole plate. a coil frame having a permanent magnet arranged therebetween and a coil arranged around the outer periphery of the lead; a base that holds the coil frame and has a predetermined coefficient of thermal expansion; and a base that is attached to the base and covers the coil frame. At the same time, the coil frame has a coefficient of thermal expansion different from that of the base, and the coil frame is bent so as to swell in the same direction as the operating direction of the leads due to temperature changes, thereby changing the spring load of the leads, thereby reducing the operating voltage due to temperature changes. It is equipped with a cover that suppresses fluctuations in the temperature.

[Effect]

According to the structure of this invention, when there is a temperature change, the coil frame is bent together with the base due to the difference in thermal expansion coefficient between the base and the cover, and the spring load of the lead changes, so the temperature dependence of the permanent magnet and the coil is It is possible to prevent fluctuations in operating voltage due to Therefore, temperature compensation can be performed without increasing the number of permanent magnets and other parts, and assembly is also facilitated.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 8. That is, this reed relay supports the proximal end of a lead 8 having spring properties, and has one end of a pair of magnetic pole plates 9, 10 facing each other in the operating direction of the lead 8 with the free end of the lead 8 in between. a coil frame 1 in which a permanent magnet 11 is disposed between the other ends of the leads 8 and a coil 1' disposed around the outer periphery of the lead 8; a base 6 that holds the coil frame 1 and has a predetermined coefficient of thermal expansion; The lead 8 is attached to the base 6 and covers the coil frame 1, and has a coefficient of thermal expansion different from that of the base 6, and is bent so that the coil frame 1 expands in the same direction as the operating direction of the lead 8 due to temperature changes. The cover 14 suppresses fluctuations in operating voltage due to temperature changes by changing the spring load of the cover 14.

The coil frame 1 has a common terminal 4 on the flanges 2 and 3.
Then, the coil terminal 5 is planted and suspended by insert molding, the coil 1' is wound around the coil frame 1, the common terminal 4 and the coil terminal 5 are passed through the terminal insertion hole 6a of the base 6, and the coil frame 1 is installed on the base 6. . Common terminal plate 7 located at the opening of flange 2
The base end of the lead 8 is welded to the coil frame 1, and the free end of the lead 8 is positioned in the opening of the flange 3. At the flange 3, contact portions 9a and 10a formed at one end of each of a normally open magnetic pole plate 9 and a normally closed magnetic pole plate 10 face each other in the operating direction of the lead 8 with the free end of the lead 8 in between. These magnetic pole plates 9, 10 are inserted into the guide groove 3a of the flange 3.
The contact portions 9a and 10a are positioned above and below the spacer 3b projecting from the flange 3 to face the free end portion of the lead 8, and the magnetic pole plates 9,
Terminals 9b and 10b extending from base 6
It is vertically installed through the insertion hole 6a below. Further, a permanent magnet 11 is adhesively fixed between the other ends of the magnetic pole plates 9 and 10, biased on the magnetic pole plate 10, and the front side surface of the permanent magnet 11 is positioned on the tip end surface of the spacer 3b. Furthermore, the getter plate 12 is attached inside the inner cover 13.
The entire coil frame 1 is covered with a cover 14, and the inner cover 13 is covered with a cover 14, and the coil frame 1 is attached to the base 6.
Fix the seal together.

The base 6 and the cover 14 are made of a synthetic resin material or a metal material such as aluminum, and the coefficient of thermal expansion is made larger on the cover 14 side.
15 is a coil winding terminal; 16 is a protruding piece for shoulder-hanging the coil end; 17 is a press-fitting protrusion; 18 is a guide hole through which adhesive sealant 19 is simultaneously poured into the insertion hole 6a from the back side of the base 6 to fill the gap with the cover 14;
20 is an air vent hole in the base 6.

In this reed relay, when the coil 1' is not energized, the free end of the lead 8 is attracted to the contact part 10a of the normally closed magnetic pole plate 10 by the permanent magnet 11, thereby electrically connecting the common terminal 4 and the terminal 10b. By connecting and energizing coil 1', magnetic flux is passed through lead 8,
The repulsive magnetic flux of the permanent magnet 11 is applied to attract the tip of the lead 8 to the contact portion 9a, thereby connecting the common terminal 4 and the terminal 9.
b.

Furthermore, when the temperature increases, the center of the cover 14 curves to bulge away from the base 6 due to the difference in thermal expansion coefficients between the cover 14 and the base 6. As a result, the lead 8 is also bent in the same direction and the magnetic pole plate 9
The spring force is increased in the direction in which the lead 8 approaches the contact portion 9a, that is, in the same direction as the operating direction of the lead 8. As a result, the spring load on the lead 8 can be reduced, so that the impression voltage can be lowered. Therefore, the sum of the reduction rate of the moving voltage due to the permanent magnet and the reduction rate due to thermal deformation of the cover 14 and the base 6 can counteract the increase rate of the moving voltage due to the coil resistance, and balance can be achieved as a whole. . On the other hand, when the temperature drops, it can work in the opposite direction to achieve a similar balance. In this way, by changing the spring load in addition to temperature compensation through a combination of coil resistance and magnet strength, it is possible to provide a reed relay with constant sensitivity and almost constant voltage values for touching and opening with respect to the ambient temperature. I can do it. Note that temperature compensation due to thermal deformation is set based on the thermal expansion coefficients of the base 6 and the cover 14, the lead length of the leads 8, and the like.

Note that when the lead 8 moves toward the magnetic pole plate 10 by energizing the coil 1', the base 6 and cover 14
The magnitude of the thermal expansion coefficient of is reversed to that above.

In addition, if the base 6 and cover 14 are simply fitted together without bonding as shown in the figure, the amount of curvature of the coil frame 1 depending on the ambient temperature can be adjusted by using a cover 14 made of other metal or synthetic resin as necessary. can.

〔Effect of the invention〕

According to the reed relay of this invention, when there is a temperature change, the coil frame is bent together with the base due to the difference in thermal expansion coefficient between the base and the cover, and the spring load of the reed changes. Fluctuations in operating voltage due to dependence can be prevented. Therefore, temperature compensation can be performed without increasing the number of permanent magnets and other parts, and the assembly is easy.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a reed relay according to an embodiment of the present invention, FIG. 2 is a cross-sectional plan view thereof, FIG. 5 is a cross-sectional view taken along the line of FIG. 2, FIG. 6 is a cross-sectional view taken along the line of FIG. 2, FIG. 7 is a cross-sectional view taken along the line of FIG. 2, and FIG. 8 is a cross-sectional view taken along the line of FIG. 1... Coil frame, 1'... Coil, 6... Base, 8... Lead, 9, 10... Magnetic pole plate, 14...
…cover.

Claims (1)

[Claims] 1. Supporting the base end of a lead having spring properties, one end of a pair of magnetic pole plates facing each other in the operating direction of the lead with the free end of the lead in between, and a permanent magnet disposed between the other ends of the magnetic pole plates. Furthermore, a coil frame in which a coil is arranged around the outer periphery of the lead, a base that holds the coil frame and has a predetermined coefficient of thermal expansion, and a base that is attached to the base and covers the coil frame and has a thermal expansion coefficient different from that of the base. The cover has an expansion coefficient and bends the coil frame to expand in the same direction as the operating direction of the leads due to temperature changes, thereby changing the spring load of the leads to suppress fluctuations in operating voltage due to temperature changes. Reed relay with.