SU817766A1 - Magnetically-operated contact - Google Patents

Description

(54) MAGNETIC CONTROLLED CONTACT

one

The invention relates to electrical engineering, namely switching technology and can be used in relays, logic elements, computing solutions and decoding devices, matrices of coordinate connectors.

and etc.

Magnetic contacts with ferromagnetic contact springs, at the ends of which a contacting layer of a noble metal is deposited, as well as mercury contacts, the moving part of which is mercury 1, are known.

Magnetically controlled contacts without mercury are called dry.

One of the significant drawbacks of dry contact reed switches is a bounce and after it stops damped oscillations of the springs, which result in interference (noise) in the switching circuits. Mercury sealed contacts are free from these drawbacks, but complex designs and manufacturing techniques make automated manufacturing difficult and determine their high cost. The disadvantages of the majority of mercury reed switches should also include the dependence of the work of contacts on their position in space.

Magnetically controlled contacts are known in which, instead of springs, a ball made of a magnet of a soft material is moved, the ball and the ends of the fixed contacts are covered with a noble metgitl 2.

In the device several

0 eliminated the drawbacks of mercury contacts, but their manufacturing technology is complicated.

The closest to the proposed is a magnetically controlled contact,

5 containing a sealed working chamber, fixed contacts, a movable contact made of a magnet of a soft material and placed in the contact cylinder 3.

0

.

The disadvantage of this device is the insufficient magnetic holding force of the moving contact in the extreme positions, as well as

5 low resistance to mechanical overload, which in turn reduces the reliability of operation of the magnetically controlled contact.

The aim of the invention is to increase the reliability of operation.

0

To achieve this goal, the contact cylinder is made of a magnet of a soft material.

Figure 1 shows a magnetically controlled contact wetted with mercury; 2, a magnetically controlled contact is not wetted by mercury.

The magnetically controlled contact consists of a contact cylinder 1, a movable contact 2, Two mercury-wetted movable contacts welded into glass insulation torsl 4 and into metal holders 5. The metallic holders are sealed by means of flanges to a contact cylinder 1, in which 6 the movable contact 2 wetted by mercury glides. The fixed and movable contacts are made of magnetically soft material.

2, the movable contact 2, the ends of the fixed contacts 3 and the inner surface of the opening of the contact cylinder 1 are coated with a contact alloy and mercury are not wetted.

The device is working in the following way.

When a voltage is applied to one of the windings, the moving contact moves and closes the contact circuit through the contact cylinder and the contact 3 of the winding is fixed. In the extreme positions, the moving contact is retained due to the turning forces of the mercury bridge. In the version without mercury, the moving contact in the extreme positions holds the magnetic field of the permanent magnet (not shown) or the magnetic field of the control flow in the presence of voltage in one from the windings.

The execution of the contact cylinder from a magnet of a soft material reduces the resistance of the magnetic circuit.

whereby the magnetic holding force of the movable contact in the extreme positions increases, and consequently the resistance to mechanical overloads increases. The shape of a moving contact in the form of a ball or a shortened cylinder contributes to the formation of a uniform layer of mercury on the contact surface, which ensures the durable operation of the magnetically controlled contact. Eliminating direct contact of the contact cylinder with glass insulators allows sealing the contact chamber, such as relief contact welding at lower temperatures than glass welding requires, and mercury can be applied to the contact surfaces beforehand by assembling the assembly.

Claims (3)

Invention Formula Magnetically controlled contact, containing a sealed working chamber, stationary contacts, a movable contact made of magnetically soft material and placed in a contact cylinder, which is made of a magnet to increase the reliability of operation. blunt material. Sources of information taken into account in the examination 1, Rabkin L.I., Evgenova I.N. . Reed switches (Hermetically magnetically controlled contacts), M., Connection 1968, p. 19-23. 2. US patent number 3144533, cl. 335-153, 1962. 3. Magnet-controlled contact of the German company with the Loccell trademark. J X /