Valve core dismounting device of steam turbine valve pre-starting valve

Abstract

The utility model provides a valve core dismounting device for a steam turbine valve pre-starting valve, and relates to the technical field of steam turbines, the pre-starting valve comprises a valve body and a valve core in threaded connection with the valve body, and a bypass steam channel is arranged close to the top of the valve core; the disassembling device comprises a fixing support used for installing the pre-starting valve, an anti-rotation key is arranged on the fixing support, a key groove is formed in the valve body, and the anti-rotation key can be arranged in the key groove. The dismounting device further comprises a dismounting column and a tool plate, the valve element is sleeved with the tool plate, the dismounting column can be partially inserted into the bypass steam channel, and the dismounting column is fixedly connected with the tool plate.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbines, and more specifically, to a device for disassembling the valve core of a steam turbine pre-opening valve. Background Technology

[0002] The pre-start valve consists of a valve body, a main valve core, and a pre-start valve core. The main valve core is responsible for opening and closing the main steam passage, while the pre-start valve core opens first during the startup phase to balance the pressure and help the main valve core open more easily. However, if the pre-start valve core is stuck, the seal is worn and fails, or foreign objects are stuck and not completely reset, residual steam pressure will remain in the bypass steam passage of the pre-start valve, thus affecting the valve sealing effect. If the steam leakage is too large, it will affect the unit operation and prevent normal shutdown.

[0003] During long-term operation of the unit, the steam valves are subjected to high temperatures, cooling, repeated operations, and erosion from high-pressure steam. Oxide scale easily forms on the threaded mating surfaces of the pre-start valve. During disassembly, this oxide scale can easily become stuck, and the smooth surface of the pre-start valve lacks stress points, making conventional methods ineffective for disassembling the valve core. This often increases the difficulty of power plant maintenance and affects on-site maintenance progress. Previously, the method for disassembling a leaking pre-start valve core typically involved directly damaging the main valve core sealing surface, requiring the manufacturer to cut out the pre-start valve core. Poor cutting results could damage the internal structure of the pre-start valve, leading to equipment damage and making reinstallation impossible.

[0004] Therefore, there is an urgent need for a device for disassembling the valve core of the steam turbine pre-opening valve to solve this problem. Utility Model Content

[0005] The purpose of this utility model is to provide a valve core disassembly device for a steam turbine valve pre-opening valve, which can quickly separate the valve core of the pre-opening valve. The disassembly device has the technical advantages of simple structure, easy operation and strong practicality.

[0006] This utility model is achieved through the following technical solution: the pre-start valve includes a valve body and a valve core threadedly connected to the valve body, and a bypass steam passage is provided near the top of the valve core; the disassembly device includes a fixed support for installing the pre-start valve, the fixed support is provided with an anti-rotation key, and a keyway is provided on the valve body, the anti-rotation key can be placed in the keyway;

[0007] The disassembly device also includes a disassembly column and a tool plate. The tool plate is sleeved outside the valve core, and the disassembly column can be partially inserted into the bypass steam passage. The disassembly column is fixedly connected to the tool plate.

[0008] To better realize this utility model, the tool plate further includes a hollow sleeve plate, with a support plate extending outward from the outer wall of the sleeve plate, and the disassembly column is fixedly installed on the sleeve plate.

[0009] To better realize this utility model, the bottom of the anti-rotation key is further provided with a limiting channel steel, which is fixed to the top of the fixed support.

[0010] To better realize this utility model, the fixed support further includes two fixed legs, and a fixed top plate is provided between the two fixed legs, with the end of the limiting channel steel fixedly installed on the fixed top plate.

[0011] To better realize this utility model, a fixing plate is further provided at the bottom of the fixed support leg, and fixing bolts are provided on the fixing plate.

[0012] To better realize this utility model, there are two limiting channel steels, which are spaced apart. The pre-opening valve is placed on the top of the limiting channel steel. Each limiting channel steel is provided with an anti-rotation key, which is located on both sides of the valve body.

[0013] The beneficial effects of this utility model are:

[0014] This utility model uses a fixed support to fix the pre-opening valve. The disassembly column is fixedly connected to the tool plate, and the disassembly column can be placed in the bypass steam passage of the valve core. With the valve body fixed, the tool plate is struck in one direction (i.e., forward). The force is transmitted to the valve core through the four disassembly columns, which gradually loosens and separates the threaded interface between the valve core and the valve body. This allows for the inspection and treatment of defects such as jamming, seal wear failure, or foreign object jamming in the valve core. The structure is simple and easy to operate. It can quickly separate the valve core without damaging the equipment, thus improving work efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in this utility model will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the turbine valve pre-opening valve core disassembly device provided by this utility model;

[0017] Figure 2 A schematic diagram of the structure of the fixed support provided by this utility model;

[0018] Figure 3 Provided by this utility model Figure 1 A sectional view along line A in the middle;

[0019] Figure 4 Provided by this utility model Figure 1 Cross-sectional view along the BB direction;

[0020] Figure 5 A schematic diagram of the tool plate and pre-opening valve provided by this utility model;

[0021] icon:

[0022] 001-Valve core, 002-Valve body, 003-Bypass steam passage, 200-Fixed support, 201-Fixed leg, 202-Fixed top plate, 203-Fixed flat plate, 204-Fixed bolt, 210-Anti-rotation key, 220-Limiting channel steel, 300-Disassembly column, 400-Tool plate, 410-Sleeve plate, 420-Support plate. Detailed Implementation

[0023] The technical solution of this utility model will now be described with reference to the accompanying drawings.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Please refer to Figures 1-5 This utility model provides a device for disassembling the valve core of a steam turbine pre-start valve. In the prior art, the surface of the pre-start valve is smooth and there are no stress points, so conventional methods cannot disassemble the valve core 001 of the pre-start valve. In order to solve the above technical problems, this utility model sets up a disassembly device to achieve the purpose of easily disassembling the valve core 001 of the pre-start valve without damaging the equipment.

[0026] The pre-opening valve mainly includes a valve body 002 and a valve core 001. The valve core 001 is provided with a bypass steam passage 003. The disassembly device mainly includes two parts: a fixed support 200 and a tool plate 400. The fixed support 200 is used to fix and connect to the valve body 002, and the tool plate 400 is used to disassemble the valve core 001. Only through the cooperation of the fixed support 200 and the tool plate 400 can the valve body 002 and the valve core 001 be disassembled.

[0027] As shown in the figure, the fixed support 200 includes two fixed legs 201, and a fixed top plate 202 is provided on the top of the fixed legs 201. Two limiting channel steels 220 are fixedly installed on the fixed top plate 202. The two limiting channel steels 220 are arranged parallel to each other at intervals. Their function is to place the pre-opening valve. In order to better fix the pre-opening valve, an anti-rotation key 210 is also fixedly connected to the limiting channel steel 220. A keyway matching the anti-rotation key 210 is opened on the valve body 002. During the installation process, the pre-opening valve is fixed by the cooperation of the anti-rotation key 210 and the keyway. Under the action of the fixed legs 201, the valve stem of the pre-opening valve faces downward.

[0028] In order to make the structure of this device more robust and facilitate the disassembly of the valve core 001, a fixed plate 203 is also installed at the bottom of the fixed support leg 201. The fixed plate 203 is fixedly connected to the concrete below by the fixing bolts 204, thereby strengthening the overall stability of the disassembly and assembly device.

[0029] The tool plate 400 is used to connect with the valve core 001. Specifically, the tool plate 400 includes a hollow sleeve plate 410 and a support plate 420 extending outward from the outer wall of the sleeve plate 410. The sleeve plate 410 is sleeved onto the outer wall of the valve core 001. In addition, multiple disassembly posts 300 are fixedly connected to the sleeve plate 410. The free end of the disassembly post 300 extends into the bypass steam passage 003 of the valve core 001. As shown in the figure, there are four disassembly posts 300 and four bypass steam passages 003, and they correspond one-to-one with each other.

[0030] The workflow of this utility model is as follows:

[0031] First, install the pre-start valve on the fixed support 200. Specifically, place the bottom of the valve body 002 on the top of the two limiting channel steels 220, and match the anti-rotation key 210 with the keyway of the valve body 002, so that the valve body 002 will not rotate arbitrarily during the rotation of the pre-start valve.

[0032] Next, the tool plate 400 is sleeved on the outside of the valve core 001, specifically near the bypass steam passage 003 of the valve core 001. Then, the disassembly column 300 is inserted into the bypass steam passage 003. Finally, the disassembly column 300 and the sleeve plate 410 of the tool plate 400 are fixedly connected by welding.

[0033] After installation, the tool plate 400 is tapped, as shown in the figure. There are two support plates 420. When in use, the support plates 420 are tapped, which in turn drives the valve core 001, causing the valve core 001 to gradually separate from the valve body 002, thereby achieving the purpose of disassembling the valve core 001.

[0034] This utility model uses a fixed support 200 to fix the pre-opening valve. The disassembly column 300 is fixedly connected to the tool plate 400, and the disassembly column 300 can be placed in the bypass steam passage 003 of the valve core 001. With the valve body 002 fixed, the tool plate 400 is struck in one direction (i.e., forward). The force is transmitted to the valve core through the four disassembly columns 300, which gradually loosens and separates the threaded engagement interface between the valve core 001 and the valve body 002. This allows for the inspection and treatment of defects such as jamming, seal wear failure, or foreign object jamming in the valve core. The structure is simple and easy to operate. It can quickly separate the valve core 001 without damaging the equipment, thus improving work efficiency.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A device for disassembling a valve core of a pre-actuated valve of a steam turbine gate, characterized in that, The pre-start valve comprises a valve body (002) and a valve core (001) threaded with the valve body (002), and a bypass steam channel (003) is arranged near the top of the valve core (001); the dismounting device comprises a fixed support (200) for mounting the pre-start valve, the fixed support (200) is provided with an anti-rotation key (210), a key groove is arranged on the valve body (002), and the anti-rotation key (210) can be arranged in the key groove; The dismounting device further comprises a dismounting column (300) and a tool plate (400), the tool plate (400) is sleeved outside the valve core (001), the dismounting column (300) can be partially inserted into the bypass steam channel (003), and the dismounting column (300) is fixedly connected with the tool plate (400).

2. The steam turbine valve preopener valve trim removal device of claim 1, wherein, The tool plate (400) comprises a hollow sleeve plate (410), the outer wall of the sleeve plate (410) extends outwardly and is provided with a support plate (420), and the dismounting column (300) is fixedly arranged on the sleeve plate (410).

3. The steam turbine valve preopener valve trim removal device of claim 2, wherein, The bottom of the anti-rotation key (210) is further provided with a limiting channel steel (220), and the end of the limiting channel steel (220) is fixedly arranged on the top of the fixed support (200).

4. The steam turbine valve preopener valve trim removal device of claim 3, wherein, The fixed support (200) comprises two fixed legs (201), and a fixed top plate (202) is arranged between the two fixed legs (201), and the end of the limiting channel steel (220) is fixedly arranged on the fixed top plate (202).

5. The steam turbine valve preopener valve trim removal device of claim 4, wherein, The bottom of the fixed leg (201) is provided with a fixed flat plate (203), and the fixed flat plate (203) is provided with a fixed bolt (204).

6. The steam turbine valve preopener valve trim removal device of claim 4, wherein, The limiting channel steel (220) has two limiting channel steels (220) which are arranged at intervals, the pre-start valve is arranged on the top of the limiting channel steels (220), one anti-rotation key (210) is arranged on each limiting channel steel (220), and the anti-rotation keys (210) are located on both sides of the valve body (002).

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