Mechanical self-hold electromagnetic relay

Abstract

The invention provides a mechanical self-hold electromagnetic relay which comprises an electromagnetic linear driving piece with a reset function, a push head, a support, a driving rod with a reset function, a rotating wheel with a positioning ratchet wheel and a pawl rotating in one direction, and a touch pressure switch achieving breakover through touch pressure. The electromagnetic linear driving piece is connected with the push head so as to drive the push head in the linear direction; the push head and one end of the drive rod are in oblique tooth shapes matched with each other so that the push head can be meshed with one end of the drive rod to form a one-way clutch. A reset device is arranged at the other end of the driving rod and is connected with the support; the rotating wheel is arranged on the support and is connected with the driving rod so as to drive the rotating wheel to rotate unidirectionally when the driving rod is driven by the push head, the rotating wheel is provided with a convex part and a concave part, and the touch switch is arranged at the lower part of the rotating wheel, so that the touch switch is pressed when the convex part rotates to the lower part, and the touch switch is restored to a non-conducting state when the concave part rotates to the lower part. The scheme provides a better and more reliable electromagnetic relay.

Description

technical field [0001] The invention relates to the field of relay devices, in particular to a mechanical self-holding electromagnetic relay. Background technique [0002] Relay (English name: relay) is an electrical control device, which is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the change of the input quantity (excitation quantity) meets the specified requirements. It has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop). Usually used in automatic control circuits, it is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. [0003] What existing circuit automatic switch electrical appliances generally adopted is electromagne...

AI Technical Summary

Problems solved by technology

There are some defects in this specific method: first, two buttons are required to control the on-off of the load (one for normally closed and one for normally open); secondly, the current when the electromagnetic coil is working will generate heat in the coil, and the alternating current will also generate heat at the same time. Eddy currents are generated, so the relay coil working in the holding state will generate heat accumulation and cause a large temperature rise in the coil, which seriously affects the reliability of the relay operation; in addition, the load is energized, and the electromagnetic coil is always energized to work, which consumes power and energy

[0005] The self-maintaining electromagnetic relay in this state requires two coils to work alternately, the operation process is complicated, and the power-on and power-off operations of the coil need to be controlled by pressing the switch, which increases the labor cost

The power on and off of the control circuit needs to be realized by energizing the upper and lower coils in sequence, which is complicated to operate and inconvenient to use.

One more coil increases the cost of making materials such as switches and circuits, and also increases the volume of the entire relay, which is not suitable for the control of small electrical appliances

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