SU838790A1 - Sealed magnetically-operated switching device - Google Patents

Description

(54) SEALED MAGNETIC-CONTROLLED COMMUNICATING DEVICE

The invention relates to electrical engineering, in particular, to low-voltage instrumentation, and may find application in devices using reed switches. Sealed magnetically operated switching devices are known, which, by the principle of core movement, resemble valve-type electromagnets. They are sometimes called valve-lobe reed switches. Constructively such devices are a sealed enclosure consisting of a base and a casing (cap). At the base, at least one INPUT is installed, insulated from other metal parts using a glass or ceramic spa. The anchor is fixed on the elastic plate. In the presence of a magnetic control field, the core is attracted to the end of the output (core) of the circuit by an electrical circuit. The main advantage of such devices in front of reed-type reed switches is the relatively high switching capacity due to better heat removal conditions from the contact zone and an increased contact pressing force. In addition, valve-lobe reed switches have smaller overall dimensions in comparison with reed reed switches with the same switching capacity 1. The disadvantage of valve-lobe reed switches is low vibration and impact resistance. This is due to the fact that in all known constructions, measles is usually suspended at the end of an elastic plate. The inertia mass of the core at large accelerations exceeds the resistance force of the elastic plate (spring) and a false actuation of the reed switch may occur. The closest to the proposed is a sealed magnetically operated switching device with a switching contact system containing at least three leads mounted parallel to each other and secured in a metal case, an elastic plate and a flat bore 2. The disadvantage of this device is low vibration and shock resistance . The purpose of the invention is to increase vibration and shock resistance. The goal is achieved by the fact that the average output is made in the form of a hollow tube with flattened ends, elastic

the plate is placed inside the middle outlet, and the measles is mounted at the end of the elastic plate perpendicular to it and balanced.

FIG. 1 shows the proposed device, a general view; in fig. 2 is a view A of FIG. one; in fig. 3, 4 - the shape of the flattened end of the tube.

The device contains pins 1-3, mounted parallel to each other at the base 4. The anchor 5 is made in the form of a plate and, overlapping the ends of the pins 1 and 3 (FIG. 2), forms closing and opening contacts respectively. By the middle of the core, a resilient plate 6 is welded to it perpendicularly to it, which is placed inside pin 2, made of a tube. The ends of the tube are flattened. In order to allow the tube to pass through a glass tablet designed to produce a sealed spa, the maximum size of the flattened part. One end of the tube should not exceed its diameter, therefore the ends of the tube are technologically flattened most simply (Fig. 3 and 4). The lower (outer in relation to the working space of the device) end of the tube 3 (Fig. 1) of the prices (Fig. 4). The width of the slit in (Fig. 4) should be equal to the thickness of the plate. Its main purpose is to fix the fixed end of plate 6. The inner end of tube 3 is flattened (Fig. 3), the size at this end is not less than the plate thickness. Due to this, the angular movement of the free end of the plate is prevented from acceleration of mechanical effects in the direction perpendicular to the plane of the plate. Normal operation of the device with mechanical effects in directions perpendicular to the core plane, i.e. parallel pins of the terminals or close to them are provided by balancing the core with respect to the point of attachment to the plate. This makes it possible to increase the vibration and shock resistance of the device. Pins 1, 2 and bark of the device are made of a magnetically conductive material, the base 4 and the casing 7 are made of a nonmagnetic material, pin 3 and the plate 6 are made of a nonmagnetic or magnetic material. The manufacturing technology of the proposed device complies with the technology for producing sealed relays. After soldering the glass with the base metal and the findings, a core assembly with an elastic element is installed. Next, the body is sealed and air is pumped out and the internal volume is filled with an inert medium through the middle outlet.

The device works as follows:

A magnetic field is created in the gap of the closing contact by means of a control element, such as a coil, mounted on pin 1 or 2. Pin 3 is made of a nonmagnetic material, and plate 6 is bent in the middle part to obtain the required contact in the opening contact. At a certain magnitude of the magnetomotive power of the control roll, the end of the core is attracted to the end face of pin 1, a circuit is switched.

The proposed device can also be polarized if, for example, an additional coil is mounted on pin 3 made of magnetic material. The directions of the magnetic fluxes of the control coil and the additional coil in the opening contact gap must be opposite.

During the operation of the device, the elastic plate bends in the middle portion. In order to eliminate its breakage in the zone adjacent to the bark, it is advisable to make the end of the plate lighter or to weld a rectangular bracket to it from the side opposite to (fig. 1) bend.

The advantage of the proposed device, besides the increased vibration and impact resistance, is the simplicity of the design, which consists in the minimum number of parts to achieve switching contact and the simplicity of the device assembly technology and adjusting the size of the working gap. Using the proposed technical solution, multi-pole devices can be created. For this, a number of nodes of 3 outlets, cores and elastic element corresponding to the number of contacts is established at the base. The increased vibration and shock resistance of the proposed sealed magnetically controlled device allows it to be used in systems intended for operation under conditions of exposure to increased mechanical loads without additional shock-absorbing elements. The change in the device of an external polarizing source leads to an increase in the force of the contact pressing in the opening contact, and consequently, its switching capacity increases. Due to the simplicity of the design, the laboriousness of manufacturing and the cost of the device are reduced.

Claims (2)

1. Bul, B. K., Puchkov, A.S., Shoffa, V.N. Valve-lobe and membrane sealed magnetically controlled switching devices. M., "Informelectro, 1973. 2. Swiss Patent No. 467516 Cl. H 01 H 51/28, 1969. 0JJ1.1 u-i.i