SU1767558A1 - High-frequency hermetically sealed relay - Google Patents

Abstract

Usage: electrical engineering, in the development of radio equipment for switching and high frequency circuits. SUMMARY OF THE INVENTION: The high-frequency reed switch contains a glass cylinder, in the opposite ends of which two contact parts are drilled with a rectangular cross section of the same length, on the narrow sides of which copper layers are deposited, between which are located alternating layers of permallo and inner layers copper, the layers being perpendicular to the contact plane, and the thickness of the copper layer being at least two skin layer thicknesses at the minimum switching frequency. 3 il.

Description

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The invention relates to electrical engineering, in particular to magnetically controlled contacts, and can be used in the development of radio equipment for switching high-frequency circuits.

The reed switch 1 is known, containing in each contact part a non-ferromagnetic high-conducting layer located along the longitudinal axis of the contact part from the side providing the commutation. The high-conducting layer is located in the middle of the point of contact, and the surrounding ferromagnetic areas have a lower electrical conductivity, as a result of which the switched current passes only through a highly-conducting layer,

The disadvantage of such a reed switch is the one-sided arrangement of a highly electrically conductive layer, as a result of which when switching high-frequency current

The highly conductive layer is not significant due to the large influence of the skin layer around the perimeter of the contact section cross section.

There is also known a method for manufacturing combined electrical contacts 2, which consists in the fact that figured grooves are made in the base material, into which layers of contact material are pressed.

The disadvantage of this method is the complexity of the process, unsuitable for the manufacture of a reed switch with stringent requirements for the dimensions of contact parts, and one-sided arrangement of grooves with contact material, which causes large high-frequency losses and requires additional orientation of the contact parts before welding.

Closest to the proposed reed switch 3, containing contact details, coatedXI

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thin copper over the entire length, the electrical conductivity of which is higher than that of the ferromagnetic material from which the contact part is made, as a result of which, due to the skin effect, the high-frequency current passes mainly through the upper high-conductive copper. Dry connectors with such contact parts have small high-frequency losses.

The disadvantage of the prototype is the poor adhesion of glass with a copper jacket of a permalloyed core and significant high-frequency losses due to oxidation of the copper layer in the zone of formation of the metal-glass spa. Due to the difference in the coefficients of thermal expansion, the thickness of the copper layer does not exceed 10–12 µm, which is comparable with the depth of internal oxidation of copper in the junction area.

The purpose of the invention is to reduce high frequency losses and simplify manufacturing technology.

The goal is achieved by the fact that in a high-frequency reed switch containing a sealed cylinder, there are contact parts located in it that are installed in the ends of a sealed container, each contact part has a rectangular cross-section that is the same along the entire length, and parts are coated with a layer of copper, each contact part is made in the form of a package consisting of layers of copper and permallo, each layer being perpendicular to the contact plane, and 5M 5s / s with minimal switching pilots at where 5M - thickness of copper layer and 5c / s - thickness of the skin layer.

In the known technical solutions there are no signs similar to the distinctive features of the proposed solution. Nigh Consequently, the proposed technical solution has significant differences compared with the known ones.

FIG. 1, 2 shows a high-frequency reed switch in section; in fig. 3 is a perspective view of the contacting part of the contact part.

High-frequency reed switch consists of a sealed cylinder 1 and located in it the contact parts 2 and 3, installed in the ends of a sealed cylinder. Layers of 4 copper are deposited on the lateral surfaces of the indicated contact parts (Fig. 2), between which are located the permallo layers 5 alternating with each other and the inner layers of copper 6. In the area of contact, the contact part is covered with a layer

7 of gold alloy with nickel thickness of 2-3 microns.

High-frequency reed switch works as follows.

When controlling a solenoid winding or a permanent magnet (not shown in Fig. 1), the contact details are closed and the high-frequency circuit is switched, in the gap of which the reed switch leads into the gap. The high frequency current captured by the protective gold coating of the leads, in the place of soldering, is redistributed along the outer and inner layers of copper connected in parallel with each other and passes along the contact part to the contact area. Similarly, the high-frequency current passes through the second contact part and goes into the switched circuit at the soldering point of the second terminal. Each copper layer can be considered an insulated conductor. The shunting effect of permallo layers on the current passage can be neglected due to the high resistivity and high magnetic permeability, which allows permalloy to be considered as a dielectric layer for high frequency currents. Therefore, the thickness of the copper layer should be much more than two thicknesses of the skin layer at the minimum switched frequency. The thickness of the skin layer is calculated by the known formula

(5 503

/ "2

mm,

where p is the electrical conductivity of the material, mm Ohm / m;

C1 - relative magnetic permeability;

fMHH is the minimum value of the switching current frequency, Hz.

Electroplating of known gold alloys is applied to the contacting surfaces and to the leads, resulting in a high-frequency current forming a circuit consisting of several layers of copper connected in parallel with respect to the contact point and soldering point of the leads to the high-frequency circuit.

Claims (1)

Claims of the Invention A high-frequency reed switch comprising a sealed cylinder and contact parts installed at the ends of the sealed cylinder, each contact part having a rectangular cross-section the same along its entire length, and a copper layer that differs on the side surfaces of said contact parts. so that, in order to reduce 517675586 high-frequency losses and simplification of technology, contact, and dm 2 ds / s at manufacturing standards, each contact de minimum switching frequency, where the hoist is made in the form of a package, and the thickness of the copper layer is composed of, and the ds / s is the thickness from layers of copper and permallo, with each skin-layer layer is perpendicular to the flat 5 g, /, ЈS5y, / / Z / / w  /  / four one Fig.Z i figure 1 f ×