SU1580450A1 - Magnet-controlled switching contact - Google Patents

Abstract

The invention relates to electrical engineering and can be used in control and automation systems using magnetically controlled sealed contacts (reed switches). The purpose of the invention is to increase the reliability of the reed switch by obtaining a predetermined contact force in an openable pair of contacts. The reed switch contains two fixed and one moving contact (K). The fixed, openable K is equipped with a main plate with bent sides, a window and a longitudinal groove, as well as an additional contact plate with bent sides. When assembling the reed switch to establish a given contact amplifier in a disconnected pair, the moving and fixed K are brought together until the free ends of the main contact plate are closed under the action of the bent sides of the additional plate. 3 il.

Description

The invention relates to electrical engineering and can be used in control and automation systems using magnetically controlled sealed contacts (reed switches).

The purpose of the invention is to increase the reliability of the reed switch by obtaining a predetermined contact force in the opening pair of contacts.

1 shows a switching magnetically controlled contact, a general view; figure 2 - fixed break contact, axonometric; on fig.Z - fixed break contact at the time of closure, axonometric.

The magnetically controlled switching contact contains a sealed cylinder 1, inside of which there is a fixed contact disconnecting contact 2, consisting of a main contact plate 3 and an additional contact plate 4 located below, fixed on the side of outlet 5 facing the moving contact 6. Main contact plate 3 made with flanges 7 located at a right angle to the plane of plate 3. In plate 3, a window 8 is made, the width of which is equal to the distance between the sides 7. Between the window 8 and the free end of the plate 3 along its longitudinal axis there is a groove 9 of width a. The additional contact plate 4 is provided with bent flanges 10, the length of which in the direction of its longitudinal axis does not disturb the length of the specified additional pack. Otognusd

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The fbm portions 10 relate to the plate 3 rto of the bend line 11.

Magnetically operated changeover contact operates as follows.

When applying an external magnetic field created by a control coil or a permanent magnet, sufficient to operate, the closed contact of the reed switch opens. The movable contact 6 moves away from the fixed disconnecting contact 2. The free ends of the contact plug 3, under the influence of internal forces, tend to take a straight position, affecting the bent sides 10 of the contact plate 4, causing the latter to slip along the bend line 11 of the main contact plate 3 and deform the additional contact plate 4 A gap b is formed between the free ends of the main 3 and the additional 4 contact plates. The free ends of the abutment plate 3 are also diverted and a gap a is formed between them.

When the external magnetic field is removed, the moving contact 6, returning to its original position, hits the additional contact plate 4. Under the impact of a shock, directed vertically, the additional contact plate 4 moves upward, acting with its bent sides 10 on the main contact plate 3. Bent the sides of the additional contact plate 4 9 slip through the inflection line 11 of the main contact plate 3, displace the split parts in the horizontal plane.

The process of closing the disconnecting contact of the reed switch ends by closing the free ends of the plate 3, the gap between the free ends of the main 3 and the additional 4 contact plates is eliminated, and the stop plate near the window 3 receives a bend 12.

In order to ensure the equality of the distance between the free ends of the contact plate to the maximum travel of the free ends of the contact plate when it is opened, the specified distance must be calculated according to the rules of the right-angled triangle, based on the following relationship:

f -

0

five

five

five

0

five

0

five

Where

l is the distance between the protrusions at the free ends of the thrust plate;

4 - the size of the gap between the free ends of the thrust and contact plates;

d. - the angle of rotation of the bent sections of the contact plate relative to the horizontal plane.

Since the angle of rotation of the sides of the main contact plate relative to the horizontal plane from the point of view of the most complete damping of the vibration of the opening contact is 70 ° C (40 °), the distance between the free ends of the contact plate 3 and the gap between the free ends of the main and additional contact plates can lie within the following limits:

1.24, 4D.

The equality of the width of the longitudinal groove of the original contact plate to the maximum travel of the free ends of the main contact plate when opened when assembling the reed switch provides a contact force of a predetermined value in the disconnecting pair under conditions of mass production. Obtaining a contact force of the desired size allows stabilizing the temporal characteristics of the reed contact of the reed switch while simultaneously reducing the contact vibration time by 2-3 times. Reducing the time of contact vibration reduces the arc burning time between the contacts when switching electrical circuits, increasing the performance of the reed switch, and determines the possibility of some increase in switching power. F

Claims (1)

Invention Formula Magnetically controlled switching contact, containing a sealed cylinder, contact leads with a screw and a fixed contact, installed at the ends of a sealed balloon, a fixed contact that forms an opening contact pair with a moving contact, is made in the form of two contact plates, the main and additional contact plate made with i 15 otog with the window, the width of which is equal to the distance between the bent sides, and between the window and the free end of the contact plate along its longitudinal axis is a groove, an additional contact plate installed on the contact side with movable end Fig.Z Compiled by V. Chicheryukik 580450 - tact made with bent off boron, the length of which is in the direction 0 tikami its longitudinal axis does not exceed the length of said longitudinal groove, characterized in that, in order to increase reliability by obtaining a predetermined contact force in the opening contact pair, the groove width is equal to the maximum travel of the free ends of the main contact plate upon opening. 2 5 Editor L.Zaytseva Tehred M. Khodanych Order 2017 Circulation 462Subscribe VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Proofreader M. Pojo