An online maintenance independent device for oil motor of EH system of steam turbine

Abstract

The utility model relates to an independent device for realizing on-line maintenance of oil motor of EH system of steam turbine, which is simple and reliable in structure, mainly arranged between the EH system pipeline of steam turbine generator unit and the oil motor, used for realizing on-line seal replacement and maintenance of the oil motor of EH system, ensuring on-line fault handling and maintenance of the oil motor under the premise of non-stop of the unit, improving operation safety of the unit, avoiding non-stop accidents of the unit caused by faults of the oil motor, and reducing economic loss.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine EH system technology, and in particular to an independent device that can realize online maintenance of the oil motor of steam turbine EH system. Background Technology

[0002] Most steam turbine generator sets use high-pressure fire-resistant oil hydraulic control systems. Oil leaks are very common in EH systems during normal operation, especially from the hydraulic actuators. If a leak is severe and not addressed promptly, it will directly affect the safe operation of the unit, causing unplanned shutdowns and resulting in safety hazards and economic losses. Different EH system manufacturers have different design philosophies. Some manufacturers' hydraulic actuators have built-in inlet shut-off valves, but this only allows for online replacement of some of the actuator's seals. Others add ball valves to the EH pipeline for isolation, but this is inconvenient to operate and difficult to replace if the ball valves malfunction.

[0003] To address the aforementioned issues, an independent device is invented that enables online maintenance of the hydraulic actuators in the turbine's EH system. This device is placed on the operating platform, allowing for online maintenance and repair of the hydraulic actuators, facilitating operation by maintenance personnel, and featuring an aesthetically pleasing design and convenient installation, thus solving the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an independent device for online maintenance of the oil motor of the steam turbine EH system, comprising: an integrated block, a base bracket, six plate-type shut-off valves, and six pipe joint assemblies.

[0006] In a preferred embodiment, three independent pipeline channels, HP, AST, and DP, are respectively processed on the integrated block, and each pipeline is an independent channel.

[0007] In a preferred embodiment, two plate shut-off valves are arranged in series on each channel of the integrated block.

[0008] In one preferred embodiment, the pipe fitting assembly is installed on both sides of each independent channel of the integrated block for welding the corresponding pipes on the EH system and the hydraulic actuator.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0010] 1. This utility model is an independent device that enables online maintenance of hydraulic motors. It is not only simple in structure and low in cost, but also highly practical, safe and reliable, and easy and convenient to operate.

[0011] 2. This utility model can effectively isolate the operating medium between the pipeline and the oil actuator in the EH system, enabling online fault repair and handling of the oil actuator, and improving the safety and reliability of unit operation.

[0012] 3. This utility model adopts a redundant series structure of double shut-off valves, which improves reliability and ensures that the oil circuit of the oil motor is stably cut off, thus guaranteeing the safety of online handling of oil motor failures. Attached Figure Description

[0013] Figure 1 This utility model provides a schematic diagram of the layout of an independent device for online maintenance of the hydraulic actuator in a steam turbine EH system;

[0014] Figure 2 A three-dimensional structural diagram of an independent device for online maintenance of the hydraulic actuator in a steam turbine EH system is provided by this utility model.

[0015] Figure 3 This utility model provides a two-dimensional structural diagram of an independent device for online maintenance of the hydraulic actuator in a steam turbine EH system.

[0016] Legend:

[0017] 1. Integrated block; 2. Base frame support; 3. Plate gate valve; 4. Pipe fitting assembly. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 This utility model provides a technical solution: an independent device for online maintenance of the hydraulic actuator in the EH system of a steam turbine, comprising: an integrated block (part 1), a base bracket (part 2), six plate-type shut-off valves (3), and six pipe joint assemblies (part 4). Two plate-type shut-off valves (3) are arranged in series on each channel of the integrated block (1), and the pipe joint assemblies (part 4) are installed on both sides of each independent channel of the integrated block (1) for welding the corresponding pipelines on the EH system and the hydraulic actuator.

[0020] Specific implementation method one: Open the plate stop valve (3) on all independent channels, the oil inlet channel is fully opened, and the oil motor can work normally. No matter which independent channel the plate stop valve (3) is closed, the oil inlet channel will be closed. The oil inlet channel can only be fully opened when both plate stop valves (3) on the channel are in the open state.

[0021] Specific implementation method 2: When it is necessary to handle the oil motor failure online, one of the double plate shut-off valves (3) on each of the three independent channels should be closed at the same time to achieve online isolation of the oil motor.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An independent device for online maintenance of the hydraulic actuator in a steam turbine EH system, characterized in that, It includes an integrated block (1), a base bracket (2), six plate-type shut-off valves (3) and six pipe fitting assemblies (4); three independent pipeline channels, HP, AST and DP, are respectively processed on the integrated block (1), each pipeline is an independent channel, two plate-type shut-off valves (3) are arranged in series on each channel on the integrated block (1), and the pipe fitting assemblies (4) are installed on both sides of each independent channel of the integrated block (1) for welding the corresponding pipelines on the EH system pipeline and the hydraulic actuator.

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