A powered expansion capsule and power drive device

Abstract

The invention discloses an expansion capsule providing power. The expansion capsule comprises a heating element and an expansion medium. The expansion medium is evenly wrapped on the surface of the heating element to form an expansion assembly jointly, and the expansion capsule further comprises an elastic part. When the heating element performs heating, the expansion medium expands towards the periphery and acts on the elastic part to enable the elastic part to perform elastic deformation. When the heating element stops heating, the elastic part tightly adheres to the expansion medium under the effect of resilience force and enables the expansion medium to contract to an initial state. The invention further discloses a power drive device. Due to the fact that the expansion medium is evenly wrapped outside the heating element, when the heating is performed, the evenly heated expansion medium rapidly expands towards the periphery so as to provide quick and stable power. When the heating is stopped, the elastic part contract to the initial state or the initial volume under the effect of the resilience force and reset counter-force, and gaps are not produced in the expansion medium or the problem that a piston rod cannot return to the initial position is not caused.

Description

technical field [0001] The invention relates to an expansion capsule capable of providing power and a power driving device. Background technique [0002] The power drive device uses the volume change of the expansion medium after being heated to provide controllable power, thereby pushing the transmission components to undergo a controllable displacement. The Chinese invention patent with publication number CN102103947A discloses a driving device that uses an expansion medium to drive a circuit breaker switch. see figure 1 As shown, the driving device includes a housing 2, a sealing member 3, a heating wire 6, a heater 5, a phase-change expansion substance 4 and a fluid medium 7, and the heater 5 is arranged in the phase-change expansion substance 4. When the heater 5 has a phase change When the expansion substance 4 is heated, the phase-change expansion substance 4 expands, thereby pushing the ejector rod piston 1 . The ejector piston 1 converts volume expansion into dis...

AI Technical Summary

Problems solved by technology

[0003] Using the drive device in a high-temperature environment requires the use of a phase-change expansion substance 4 with a high melting point, but since the phase-change expansion substance 4 in the drive device starts heating, the phase-change expansion substance 4 far away from the heater 5 is a solidified solid state, will prevent the upward expansion of the phase-change expansion material 4 that is relatively first melted away from the heater 5 in this structure, especially when it is used in a low temperature environment or when the external space restricts the structure of the shell 2, the structure of the structure The phase-change expansion material 4 can only expand in one direction, and the expansion distance is relatively long, and the power supply speed of the driving device is relatively slow, and it is easy to cause the most distal solid phase-change expansion material 4 to be forcibly pushed to destroy the seal 3; After the heating is stopped, the phase-change expansion substance 4 away from the heater 5 first solidifies and scabs, and part of the phase-change expansion medium 4 may solidify on the inner cavity wall of the shell 2 or on the seal 3, resulting in the cooling of the ejector rod piston 1. Cannot be reset to the initial position smoothly

In this way, the driving device can only use the phase-change expansion substance 4 with a relatively low melting point, and the ejection speed and recovery speed of the ejector rod piston 1 are relatively slow, so that the operating environment temperature range and speed of the driving device are limited.

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