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        • 電動執行機構
        • 閘閥、蝶閥
        首頁 > 技術文章 > 防爆電動執行器的型式及原理



        Explosion-proof Type and Principle of Explosion-proof Electric Actuators


        Electric actuators are used in very harsh working conditions,often with a lot of flammable and explosive gas mixture,therefore, the explosion-proof function of the electric actuator is highly required, so as to ensure the safety and effectiveness of the electric actuator.Taking the explosion-proof electric actuator produced by the Sino-British joint venture Tandy Valve as an example, this paper analyzes how to design the explosion-proof structure of the electric actuator.


        1. Flameproof electric actuator " d "


        An electric actuator with a flameproof enclosure. The flameproof enclosure can withstand an explosion inside a combustible mixture that has entered the outer shell without damaging it bad, and does not ignite the external explosion of one or more gases or vapors through any joint or structural holes on the housing electric actuator housing for the environment.


        2.Increased safety electric actuator "e"


        An electric actuator that does not generate electric arc and spark under normal operating conditions is adopted to take some additional measures to improve its safety, defense
        An electric actuator that prevents dangerous temperatures, arcs, or sparks from appearing on external parts of its internal box.


        3.Intrinsically Safe Type Electric Actuators "i"


        Intrinsic safety usually refers to a system and not to a device. People usually say that a transmitter or sensor or sensor is essential.When secure, this is a simplified term, in fact inherently safe refers to an essential safety system consisting of a transmitter or sensor via cable and associated equipment (security grids, etc.).


        Intrinsically safe circuit


        Intrinsic safety circuit means any spark or any thermal effect produced under specified conditions (including normal working and prescribed conditions) shall not ignite the specified explosive gas environment.


        Intrinsic safety equipment


        Intrinsic safety equipment means that all the internal circuits are essential safety circuits of electric actuators.


        Associated equipment

        關聯設備指內部裝有本質安全電路和非本質安全電路,且結構使非本質安全電路不能對本質安全電路產生不利影響的電動執行器。關聯設備在危險場所安裝使用時, 應加其他形式防爆外殼保護,例如隔爆型、正壓型等;在安全場所安裝使用時,其外殼可選用一般型。在本質安全系統中與本質安全設備有電氣連接,接口部分有限壓, 限流環節(限制能量)的電動執行器可認為是關聯電動執行器,如齊納安全柵、隔離式安全柵、本質安全電源、光電隔離接口電器等。

        The device is an electric actuator with intrinsic safety circuit and non-essential safety circuit, and its structure prevents the non-essential safety circuit from having an adverse effect on the intrinsic safety circuit. Other forms of explosion-proof enclosure protection should be added when the associated equipment is installed and used in dangerous places, such as flame-proof type, positive-pressure type, etc. For installation and use in a safe place, the housing may be of the general type. Motor actuators with electrical connections to intrinsic safety equipment, limited voltage in the interface part, and limited current limiter ( limited energy) can be considered to be associated with an electric actuator in an intrinsic safety system, Such as Zener Safety Grid, Isolated Safety Grid, Intrinsic Safety Power Supply, Photoelectric Isolation Interface Electrical Equipment, etc.


        4.Positive Pressure Type Electric Actuators "p"


        An electric actuator that achieves safety by keeping the pressure of an internal protective gas above the surrounding explosive ambient pressure.


        5.Pouring Type Electric Actuators "m"


        The whole equipment or part of it is put in a pouring agent and cannot ignite the electric actuators of the surrounding explosive mixture under normal operation and in case of an approved overload or failure of approval.