RU2108479C1 - Electromagnetic valve - Google Patents

Abstract

FIELD: mechanical engineering; engines; remote control of fuel delivery in automobile gasoline pipe when automobile is furnished with antitheft device. SUBSTANCE: electromagnetic valve has additional winding connected in opposition with main winding and arranged so that both windings enclose the ends of core. Permanent magnet fixed by magnetic circuit locks in two extreme positions is used as core. Fixing is done for long time until electromagnetic valve is changed over by short - time application of polar voltage to opposite connected windings thanks to which like poles S-S or N-N are formed on magnetic locks. These poles act simultaneously onto core made of permanent magnet and its one end repels and the other, attracts. In process of changing over first repelling force prevails and at the end of process, attracting force. EFFECT: enlarged operating capabilities. 2 dwg

Description

 The invention relates to remote control of the supply and interruption of liquid fuel in the gas line of vehicles when equipped with an anti-theft device.

 Known solenoid valves for feeding and interrupting liquid fuel in the gas line of a car. So, for example, a mini-electric valve (IEC) was developed by the EVTON association taking into account world experience and its own original technical solutions, it is manufactured by the Rezhevsky Mechanical Plant as an anti-theft device for cars.

 IEC is represented by two main options: in a normally open and normally closed state. Solenoid valves in the normally open state are easily disabled as an anti-theft device by interrupting the power supply circuit and this is a significant drawback.

 The disadvantage of a solenoid valve in a normally closed design is the fact that a continuous supply of power is required to supply fuel; this exacerbates the thermal regime and power consumption.

 As a prototype, an electromagnetic valve is considered, comprising a housing with feed and discharge channels and a saddle, overlapped by a locking member located in the core of the electromagnet.

 The functioning of the electromagnetic valve is carried out by applying voltage to the electromagnetic winding and removing it. The return to its initial state occurs under the influence of a spring, and, thus, the prototype has the same drawbacks noted when considering IEC in a normally open version.

 The purpose of the invention is the elimination of disadvantages.

 For this, the solenoid valve, comprising a housing with feed and discharge channels and a seat, an electromagnetic coil with a core and a locking element, has an additional electromagnetic winding, which is counter-connected with the main coaxial, and a permanent magnet is used as the core, which is fixed in two extreme positions due to their magnetic properties within the established latches of the magnetic circuit.

 The functioning of the solenoid valve is carried out by briefly supplying on-the-fly windings of polar voltage. With a positive pulse, the electromagnetic valve closes and remains in this anti-theft mode in a de-energized state for an arbitrarily long time.

 When a pulse of opposite polarity is applied, the electromagnetic valve opens and remains in a de-energized state also without time limitation, i.e. the solenoid valve has a "magnetic memory".

 Figure 1 presents the design of the proposed electromagnetic valve; figure 2 - the principle of operation of the electromagnetic valve system.

 The solenoid valve consists of a housing containing a feed channel 1, a position-adjustable seat 2, a locking member 3 (ball), a discharge channel 4, a rod 5, a magnetic circuit 6, a main winding 7, an auxiliary winding 8, a sectioned coil body 9, coil electrical contacts 10, an adjustable latch 11 of the magnetic circuit, a permanent magnet 12 is the core, an unregulated latch 13 of the magnetic system.

 The principle of operation of the electromagnetic valve is as follows.

 In the initial state - the open position, the gas enters the feed channel 1, passes through the inner hole of the seat 2, pushes the locking element 3 and passes into the discharge channel 4. The rod 5 is also in a compressed state, since the core 12 made of a permanent magnet is in magnetic contact with the latch 11.

 The dynamic switching process of the solenoid valve is shown in FIG. 2. At the time of applying a voltage pulse to the on-off windings 7 and 8 (Fig. 2) on the clamps 11 and 13 of the magnetic circuit 6, the same poles S-S arise, which act on the magnet 12 from two opposite sides.

 As can be seen from FIG. 2, the south pole of the magnet 12 will push away from the latch 11, and the north will be attracted to the latch 13.

 The movement of the magnet 12 and its fixation are transmitted through the rod 5 (Fig. 1) to the locking member 3, which is pressed against the seat 2, separating the feed and discharge channels. From the moment the magnet 12 is fixed at the latch 13, the electromagnetic valve remains closed for a long time.

 To open the solenoid valve, a voltage pulse of opposite polarity is applied, under the influence of which the same poles N-N will be created on the latches 11 and 13.

 Now a repulsive force will act on the north pole of magnet 12, and an attractive force will act on its south pole. Under the influence of these opposite forces, the magnet 12 moves to the magnetic latch 11 and is fixed on it. The rod 5 will be released from the stop of the magnet 12 and will remove the force from the locking member 3 and thereby ensure communication between the feed channel and the reset channel. Gasoline under pressure will flow through the gas pipeline.

 It should be noted that the claimed electromagnetic valve has other positive effects. Firstly, due to the presence of two electrical windings to the magnet, two forces always act when a voltage pulse is applied: repulsive, more intense at the initial moment, and attractive, more intense at the final switching moment, both when opening and closing the electromagnetic valve. The unevenness of each effect individually is caused by a change in the gap between the magnetic core and its clamps. Due to the addition of efforts, the effect on the magnetic core 12 becomes quasi-constant and thereby ensures the reliability of switching the electromagnetic valve.

 Secondly, due to the quasi-constant force on the magnetic core, it is possible to minimize the number of ampere-turns to the maximum and thereby ensure the minimum dimensions of the electromagnetic valve.

 Thirdly, thanks to the switching control pulse of the electromagnetic valve, it is possible to minimize the number of turns of the electrical windings by increasing the current. This reduces the time constant of the electrical windings, which increases the intensity of the initial switching process.

 Fourth, the use of pulse control of the switching process of the electromagnetic valve allows you to use a specially organized increased voltage pulses and thereby exclude the possibility of switching the electromagnetic valve from the vehicle’s battery directly for the purpose of car theft.

 Fifthly, thanks to pulse switching control, it becomes possible to use a low-power autonomous power source for an electromagnetic valve, for example, from a Krone battery, using a voltage level converter and a high-capacity storage capacitor.

Claims (1)

 An electromagnetic valve comprising a housing with supply and discharge channels, an electromagnetic coil with a core and a locking member, a magnetic circuit, characterized in that a second electromagnetic coil is additionally inserted into it, counter-connected with the first and spatially arranged so that both coils span the ends of the core, made of a permanent magnet and locking in extreme positions by the latches of the magnetic circuit.

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