Matching structure of electrical valve positioner and actuator for industrial process control

Abstract

The invention discloses a matching structure of an electrical valve positioner and an actuator for industrial process control and belongs to the technical field of straight-stroke instrument controlling devices. The electrical valve positioner comprises an electrical valve positioner body which is provided with a return rod and an air outlet of the positioner and an air filtering decompressor, the actuator comprises an actuator body, a bracket and a linkage rod, the air filtering decompressor is matched and connected with the electrical valve positioner body which is arranged on the bracket and is communicated with an air path of the actuator body, the actuator body is arranged at the top of the bracket, the top of the bracket is provided with a through hole of the linkage rod, the linkage rod is connected with the return rod and the actuator body, the bracket is provided with an airway with an air inlet and an air outlet of the airway, the air inlet of the airway is communicated withthe air outlet of the positioner, and the air outlet of the airway is communicated with the actuator body. The invention has simplified structure, increases the manufacturing efficiency and avoids air leakage, thus saving energy, guarantees the open-close accuracy of the valve and does not need maintenance, thus reducing the examining and maintaining workload of workers.

Description

technical field [0001] The invention belongs to the technical field of straight-stroke instrumentation control devices, and in particular relates to a matching structure between an electric valve positioner and an actuator for industrial process control. Background technique [0002] The industrial process control mentioned by the applicant above refers to the process control of monitoring the production process, usually aimed at the automatic actuator of the automatic instrument, that is, the actuator, more specifically, the actuator is acted on by the electric valve positioner, The opening and closing of the valve is controlled by the actuator. Since the automatic control of valves is involved in the production process of papermaking, chemical medicine, food and electronic products, as well as in facilities such as electric power, water supply, steam supply, ships and aircraft, electric valve positioners and actuators are used in Applications in these fields, but not limi...

AI Technical Summary

Problems solved by technology

Although connecting the actuator and the electric valve positioner with a pipeline has the advantage of being convenient for replacing the pipeline, the following technical problems will be exposed when it is put into practical manufacture and application: First, the processing is troublesome, because not only the electrical The valve positioner is provided with an interface such as a pipe joint for connecting one end of the pipeline, and a pipe joint for connecting the other end of the pipeline needs to be installed on the actuator; secondly, leakage is unavoidable, which not only causes energy waste, but also causes Insufficient air pressure affects the execution effect of the actuator, so that the accuracy of opening, closing or adjusting the opening and closing degree of the valve cannot be guaranteed, especially when it is used in the production of materials used in chemical, pharmaceutical and high-end electronic products. , it will affect the liquid-liquid or gas-liquid ratio, resulting in product scrap; the third is the installation is cumbersome, the pipeline used to supply pressure air to the actuator is connected to the electric valve positioner and the actuator assembly workload is large, Affect the installation efficiency; Fourth, because the pipeline is exposed, it loses the simplicity of the structure, especially for the protection of the pipeline; Fifth, the maintenance workload is heavy, and the pipeline needs to be inspected and replaced regularly or irregularly. It not only affects the continuous production, but also increases the extra workload of workers

[0005] The reason why the coordination structure of the electric valve positioner and the actuator in the prior art has many disadvantages mentioned above and people still generally adopt it is because it is restricted by the following two factors. First, the industry always believes that the use of pipeline connection is the only Choice, because the pipeline connection is intuitive and easy to replace; second, the design ideas of the industry are deeply rooted by the shackles of traditional design ideas, and they dare not go beyond, lest they will not be accepted or even rejected by the market

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