Hydraulic valve actuator

Abstract

The invention discloses a hydraulic valve actuator. A hydraulic cylinder is arranged in a shell of the hydraulic valve actuator and provided with an upper cylinder cover and a lower cylinder cover, apiston is arranged in the hydraulic cylinder and partitions the hydraulic cylinder into an upper cavity and a lower cavity, and a control valve is arranged on the piston; the piston is connected to apiston rod, a reset device is arranged in the shell and connected with the piston rod, and after the piston rod moves downwards, the reset device can enable the piston rod to reset; and the shell is further provided with a hydraulic source, the hydraulic source is connected with the upper cavity of the hydraulic cylinder through a first channel, connected with the lower cavity of the hydraulic cylinder through a second channel and provided with a conveying device, and the conveying device conveys hydraulic oil in the hydraulic source into the upper cavity through the first channel. According to the hydraulic valve actuator, congenital defects and failure risks of an electro-hydraulic actuating device are overcome, the higher control precision, the longer service life, the simpler structureand the most convenient maintainability are guaranteed, and the control quality of the controlled valve is guaranteed.

Description

technical field [0001] The invention relates to an electromechanical combined hydraulic valve actuator, which belongs to the technical field of intelligent automatic control. Background technique [0002] In the existing liquid and gas transportation industry, especially in the heating industry, the requirements for the size and control of the heat energy conveyed are relatively strict in the industry. For example, if the heat supply is too small, it cannot meet the needs of users, and if the heat supply is too large, it will cause waste, and at the same time, it will affect the economic benefits of the heating party. Since the medium transmitted by the heating system is often high-temperature and high-pressure steam above 200 degrees, once the actuator is out of control due to failure, it may cause accidents and damages, with serious consequences. [0003] Valves for gas and liquid transmission in the industry, especially for heat energy transmission, generally use straigh...

AI Technical Summary

Problems solved by technology

[0007] (1) The connecting part of the hydraulic cylinder bottom connected with the straight-stroke valve stem is in a semi-rigid and unstable support state of the return spring, with uncertain constraints and dynamic additional destructive force, making the relevant parts vulnerable, especially The connection at the bottom of the hydraulic cylinder is damaged, which leads to failure of the entire actuator;

[0008] (2) Almost all electro-hydraulic valve actuator products adopt a single-acting piston hydraulic cylinder structure, and there are always potential failures caused by unreasonable design between the cylinder head and the piston rod.

[0009] (3) The return spring is an essential core component. This kind of energy storage component that needs to play a stabilizing role is forcibly pressed into the casing. Because it cannot be effectively centered, it plays a different role on other parts in contact with it at all times. The damage effect, and under certain conditions, there are hidden dangers of burst damage and personal injury such as pipeline vibration, impact, and accidental dismantling;

[0010] (4) The hydraulic pump valve and other components are placed inside the hydraulic cylinder, which is prone to heat, difficult to assemble and disassemble, and difficult to maintain

[0013] 1. The piston rod is broken and the screw teeth fall off

[0014] 2. There is a flaw in the seal between the hydraulic cylinder and the piston, which leads to the loss of pressure of the hydraulic oil and the failure of the actuator

[0015] 3. The seal between the piston and the sealing ring above the hydraulic cylinder is flawed, resulting in the loss of hydraulic oil until there is no oil, resulting in the failure of the actuator

[0016] Moreover, the electric bypass valve and the oil pump are all sealed. When the device is damaged, the entire actuator must be disassembled for maintenance or replacement, which is very inconvenient and poses a safety hazard.

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