RU29978U1 - Solenoid valve forced switch - Google Patents

Description

Solenoid valve forced switch

The utility model relates to pipeline valves, in particular, to valves with an electromagnetic actuator; it can also find application in electrical engineering. The utility model is designed to generate voltage applied to the winding of the electromagnetic valve, and its forced inclusion.

The literature describes a design containing a rectifying diode bridge, the input of which is connected to an AC line, and an electromagnet winding is included in the diagonal of the bridge. The basic relationships between currents and voltages in the circuit are given (A. Slivinskaya, A. V. Gordon. Electromagnets with built-in rectifiers. - M.: Energy, 1970, her. 45-50, fig. 2-4, 3-13) . This design is the closest analogue of the proposed device.

The applicant also knows a solenoid valve control device comprising a magnetic circuit with a coil, inside which a rod is placed with the possibility of interaction with the armature, a gate, a rectifier bridge, in the diagonal of which an electrolytic capacitor is included, as well as a contact group interacting with the rod through a sealing device such as a bellows coil made double winding with a ratio of turns 5 to 1 (RF Patent No. 2142087 F 16 K 31/02. The control device of the electromagnetic valve). When the valve is turned on, the current flows through the winding with a large number of turns, the magnetic circuit is magnetized, the armature retracts, the stem mechanically interacts with the contact group and, when the armature is fully retracted, disconnects the winding current; anchor retention is due to the residual magnetization of the steel of the magnetic circuit; when the valve is turned off, the electrolytic capacitor is discharged through the winding with a smaller number of turns, the magnetic circuit is demagnetized, the armature is lowered.

Along with such advantages as profitability, small dimensions and weight, the device is not without drawbacks. Due to the absence of current flowing through the winding after switching on, the retracted armature of the electromagnet is retained only due to the residual magnetization of steel. In conditions of strong mechanical shock and vibration, this force may not be enough.

The objective of the utility model is to increase the reliability of turning on and holding the solenoid valve while reducing the electric energy consumed by the valve, thus reducing the overall dimensions and material consumption of the solenoid valve while maintaining the specified technical parameters of the valve and the source of supply voltage (mains).

The technical result is achieved in that a forced switching device of the electromagnetic valve comprising a rectifying diode bridge, the input of which is connected to an AC line, and a valve coil is included in the diagonal of the bridge, a capacitor and a controllable key connected in parallel with the coil of the electromagnetic valve are additionally introduced, and a key management circuit that opens it for the period of time necessary to turn on the valve when the device is connected to an AC line.

Fig. 1 is a schematic diagram of an electrical circuit diagram of a forced activation of a solenoid valve; 2 and 3 are schematic technical versions of the device.

The solenoid valve control device comprises a rectifier diode bridge 1, to the input of which an ac voltage supply line of a sinusoidal shape of industrial frequency 2 is connected, the solenoid valve winding 3 is included in the diagonal of the bridge 1, and the time constant of the solenoid valve winding is several times more than half the voltage period in the line 2. Parallel to the winding of the solenoid valve 3, a circuit is turned on, consisting of a series-connected capacitor 4 and a key 5. Opening the key 5 is carried out by means of control circuit 6. Control circuit 6 is a device of the type of one-shot or timer, the start of which occurs when the device is connected to line 2, and the key input control stage 5. Key 5 may be a bi-directional or unidirectional, shunted counter diode 7.

The proposed device operates as follows.

At the time of supplying voltage to line 2 for the boost period, control circuit 6 opens the key 5. The capacitor 4 is charged through the diode bridge 1, key 5, and, in particular, through the diode 7, with current to a voltage close to the voltage amplitude Um in line 2. Discharge current the capacitor 4 flows through the key 5, in the particular case through the diode 7, and the winding of the valve 3. The current in the winding 3 contains constant and alternating components. Due to the large inductance of the winding, the alternating current component is much less than the constant

component. The constant component of the current of the valve winding is close to the ratio of the average voltage across the capacitor 4 and the ohmic resistance of the winding 3.

After the time of forcing, key 5 closes. The capacitor 4 can remain charged to the maximum possible voltage, but its discharge through the winding 3 is impossible. The current in the valve winding 3, as before, contains constant and variable components, the value of the constant component of the current is now equal

, 637Un / R,

where 1o is the average current of the valve winding;

Urn - AC voltage amplitude in line 2;

R is the active resistance of the winding 3.

Experiments with a solenoid valve, the resistance and inductance of the winding of which was 2.5 kOhm and 40 G, respectively, showed that at a capacitor of 22 μF, the current of the winding during the boost period exceeds the current during the holding period by 42%. When choosing a boost period from 1.5 to 2 seconds, the valve is reliably turned on over a wide range of supply voltages in the line.

Thus, the proposed device allows to reduce the consumption of the electromagnetic valve in one and a half to two times, to reduce its overall dimensions, increase reliability and expand the range of operating voltages downward.

Applicant LLC ANTRIMA Veliky Novgorod

l r-t./ V /// - х У

Claims (2)

1. A forced-on solenoid valve actuator, comprising a rectifier diode bridge, the input of which is connected to an alternating current line, and a valve winding is included in the diagonal of the bridge, characterized in that a capacitor and a controllable bidirectional switch are added in series with it and connected in parallel with the electromagnetic valve winding , and a key management circuit that opens it for the period of time necessary to turn on the valve when the device is connected to an AC line. 2. The device according to claim 1, characterized in that instead of the controlled bidirectional key, a controlled unidirectional key is used, shunted by the included counter-unmanaged key (diode).