Emergency opening tool for isolating valve of steam-water separation reheating system of nuclear power station

Abstract

The nuclear power station steam-water separation reheating system isolation valve emergency opening tool comprises a first gasket, a second gasket, a lifting mechanism and a connecting nut, the first gasket is installed on a valve supporting plate, a first through hole is formed in the middle of the first gasket, and a valve rod penetrates through the first through hole; the second gasket is arranged above the first gasket and can move up and down relative to the first gasket, a second through hole is formed in the middle of the second gasket, and the valve rod penetrates through the second through hole; the lifting mechanism is arranged between the first gasket and the second gasket, and the lifting mechanism supports the second gasket and drives the second gasket to move up and down; the connecting nut is arranged above the second gasket, and after the valve rod penetrates out of the second gasket, the connecting nut and the valve rod are connected and fixed in a threaded mode. When the isolating valve of the steam-water separation reheating system cannot be normally opened, an emergency opening tool is additionally arranged to forcibly open the valve, and the situation that the power of a unit cannot be increased due to the fact that the isolating valve cannot be opened is avoided.

Description

Technical Field

[0001] This application relates to the field of electric valves, and more particularly to an emergency opening tool for an isolation valve in a nuclear power plant steam-water separation and reheat system. Background Technology

[0002] Isolation valves in nuclear power plant steam-water separation and reheat systems are typically electrically operated, specifically electrically operated wedge gate valves. These valves consist of an electric actuator and a valve body. The actuator rotates, causing the valve stem to move up and down, which in turn moves the valve disc, thus opening and closing the valve. When the unit is shut down, the isolation valve is closed using the electric actuator. However, when the unit is started up, the isolation valve needs to be opened. Due to the "boiler effect," the valve requires a large opening force. If the maximum torque of the electric actuator cannot overcome the pull-out torque of the valve disc, the valve cannot open, affecting the normal operation of the nuclear power plant's steam-water separation and reheat system and preventing the unit from increasing its power output.

[0003] Therefore, it is necessary to develop an emergency start-up tool that can open the isolation valve of the steam-water separation and reheat system under the above circumstances to ensure the normal operation of the steam-water separation and reheat system of the nuclear power plant. Utility Model Content

[0004] To address one of the technical problems existing in the prior art, this application provides an emergency opening tool for the isolation valve of the steam-water separation reheat system in a nuclear power plant. This tool is used to open the isolation valve of the steam-water separation reheat system in a nuclear power plant in an emergency, enabling the unit to normally increase its power output.

[0005] An emergency opening tool for an isolation valve in a nuclear power plant steam-water separation reheat system, according to some embodiments of this application, is provided. The isolation valve includes a valve disc and a valve stem. One end of the valve stem is connected to the valve disc, and the other end passes upward through a valve support plate of the isolation valve. The emergency opening tool includes: a first gasket mounted on the valve support plate, with a first through hole in its center through which the valve stem passes; a second gasket positioned above the first gasket, capable of vertical displacement relative to the first gasket, with a second through hole in its center through which the valve stem passes; a lifting mechanism positioned between the first and second gaskets, supporting and driving the second gasket upward; and a connecting nut positioned above the second gasket, with the connecting nut and valve stem connected and fixed by threads after the valve stem passes through the second gasket.

[0006] In some embodiments of this application, the lifting mechanism is a jack.

[0007] In some embodiments of this application, two lifting mechanisms are provided, and the two lifting mechanisms are symmetrically distributed with the first through hole as the center.

[0008] In some embodiments of this application, the jack is any one of a screw jack, a hydraulic jack, or an electric jack.

[0009] In some embodiments of this application, the connecting nut is fixedly mounted on the second washer by welding.

[0010] In some embodiments of this application, the connecting nut and the second washer are integrally formed.

[0011] In some embodiments of this application, the connecting nut is rotatably disposed on the second washer, and the outer diameter of the connecting nut is larger than the diameter of the second through hole.

[0012] In some embodiments of this application, the horizontal cross-section of the connecting nut is hexagonal.

[0013] In some embodiments of this application, a base is integrally provided on the connecting nut, the outer diameter of the base is larger than the outer diameter of the connecting nut, and the connecting nut contacts the second washer through the base.

[0014] In some embodiments of this application, the thickness of the first gasket and the second gasket is 10mm to 20mm.

[0015] The beneficial effects of this application are as follows: This application provides an emergency opening tool for the isolation valve of a nuclear power plant's steam-water separation reheat system. In use, a first gasket and a second gasket are installed on the valve stem, and a connecting nut is threaded onto the valve stem. A lifting mechanism between the two gaskets drives the second gasket and the connecting nut to lift, causing the valve stem to move upwards, thereby opening the valve. After the valve is opened, the emergency opening tool is removed from the valve stem and reset. This application allows for the forced opening of the isolation valve in a steam-water separation reheat system when it cannot be opened normally, preventing the unit from being unable to increase power output due to the isolation valve's inability to open.

[0016] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0018] Figure 1 This is a structural schematic diagram of the emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system provided in this application.

[0019] Label Explanation:

[0020] First gasket 100, first through hole 110, second gasket 200, second through hole 210, lifting mechanism 300, connecting nut 400, screw hole 410, base 420. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0022] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0023] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0024] The following is in conjunction with the appendix Figure 1The provided embodiments further illustrate the emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system proposed in this application.

[0025] First, the isolation valve of the nuclear power plant's steam-water separation reheat system includes a valve disc and a valve stem. One end of the valve stem is connected to the valve disc, and the other end passes upward through the valve support plate of the isolation valve. Normally, an electric actuator is installed on the valve stem, which drives the valve stem to close or open the isolation valve. However, in some situations, when the isolation valve needs to be opened, due to the "boiler effect," the required opening force is too large, and the maximum torque of the electric actuator cannot overcome the pull-out torque of the valve disc. In such cases, the valve cannot be opened. Therefore, the electric actuator needs to be removed, and the emergency opening tool for the nuclear power plant's steam-water separation reheat system isolation valve provided in this application needs to be installed on the exposed valve stem to forcibly open the isolation valve and prevent the unit from being unable to increase power due to the isolation valve's inability to open.

[0026] like Figure 1 As shown, in some embodiments, this application provides an emergency opening tool for the isolation valve of a nuclear power plant steam-water separation reheat system. The emergency opening tool includes a first gasket 100, a second gasket 200, a lifting mechanism 300, and a connecting nut 400. Specifically, a first gasket 100 is mounted on a valve support plate, and a first through hole 110 is provided in the middle of the first gasket 100, through which the valve stem passes; a second gasket 200 is positioned above the first gasket 100, and the second gasket 200 can move up and down relative to the first gasket 100, and a second through hole 210 is provided in the middle of the second gasket 200, through which the valve stem passes; a lifting mechanism 300 is positioned between the first gasket 100 and the second gasket 200, and the lifting mechanism 300 supports the second gasket 200 and drives the second gasket 200 to move up and down; a connecting nut 400 is positioned above the second gasket 200, and a threaded hole 410 is provided in the connecting nut 400, with an internal thread that mates with the valve stem. After the valve stem passes through the second gasket 200, the connecting nut 400 and the valve stem are connected and fixed by the thread. This application provides an emergency opening tool for the isolation valve of a nuclear power plant's steam-water separation reheat system. In use, a first gasket 100 and a second gasket 200 are installed onto the valve stem, and a connecting nut 400 is threaded onto the valve stem. A lifting mechanism 300 between the two gaskets drives the second gasket 200 and the connecting nut 400 to lift, causing the valve stem to move upwards, thereby opening the valve. After the valve is opened, the emergency opening tool is removed from the valve stem and reset. This application allows for the forced opening of the isolation valve in a steam-water separation reheat system when it cannot be opened normally, preventing the unit from being unable to increase power output due to the isolation valve's inability to open.

[0027] like Figure 1As shown, in some embodiments of this application, the lifting mechanism 300 is a jack to provide a stable driving force to drive the second washer 200 and the connecting nut 400 to lift. Furthermore, the jack can be any one of a screw jack, a hydraulic jack, or an electric jack, and the operator can make a reasonable selection according to actual needs. Hydraulic jacks are preferred, as they have the advantages of small size, large lifting force, and stable output.

[0028] like Figure 1 As shown, in some embodiments of this application, two lifting mechanisms 300 may be provided, symmetrically distributed around the first through hole 110. Providing two symmetrically distributed lifting mechanisms 300 ensures a balanced lifting force, making the linear upward movement of the valve stem more stable. Furthermore, it is readily apparent that in other embodiments of this application, the emergency opening tool may only have one lifting mechanism 300; or, in other embodiments of this application, the emergency opening tool may have three or more lifting mechanisms 300.

[0029] like Figure 1 As shown, in some embodiments of this application, the connecting nut 400 can be fixedly mounted on the second washer 200 by welding, so that the connection between the connecting nut 400 and the second washer 200 is stable and reliable.

[0030] like Figure 1 As shown, in some embodiments of this application, the connecting nut 400 and the second washer 200 can also be obtained by integral molding to reduce the number of parts and improve the reliability of the equipment.

[0031] like Figure 1 As shown, in some embodiments of this application, the connecting nut 400 can also be rotatably mounted on the second washer 200. The outer diameter of the connecting nut 400 is larger than the diameter of the second through hole 210, preventing the connecting nut 400 from passing through the second through hole 210. Furthermore, in some embodiments of this application, a base 420 can be integrally provided on the connecting nut 400. The outer diameter of the base 420 is larger than the outer diameter of the connecting nut 400. The connecting nut 400 contacts the second washer 200 through the base 420. The base 420 expands the contact surface between the connecting nut 400 and the second washer 200, making the connecting nut 400 more securely and reliably mounted on the second washer 200.

[0032] like Figure 1 As shown, in some embodiments of this application, the horizontal cross-section of the connecting nut 400 is hexagonal, which can be adapted to a wrench. When necessary, the connecting nut 400 can be rotated counterclockwise with a wrench, thereby driving the valve stem to lift upward and opening the valve in an emergency.

[0033] like Figure 1 As shown, in some embodiments of this application, the thickness of the first shim 100 and the second shim 200 is 10mm to 20mm, which can support the pushing force of the lifting mechanism 300 without deformation. Furthermore, the diameter of the first shim 100 and the second shim 200 is greater than 20cm to provide sufficient support surface for mounting the lifting mechanism 300.

[0034] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. An emergency opening tool for an isolation valve in a nuclear power plant's steam-water separation reheat system, the isolation valve comprising a valve disc and a valve stem, one end of the valve stem being connected to the valve disc, and the other end of the valve stem passing upward through a valve support plate of the isolation valve, characterized in that... The emergency activation tool includes: A first gasket is mounted on the valve support plate, and a first through hole is provided in the middle of the first gasket, through which the valve stem passes; The second gasket is disposed above the first gasket and can be moved up and down relative to the first gasket. The second gasket has a second through hole in the middle and the valve stem passes through the second through hole. A lifting mechanism is disposed between the first pad and the second pad, the lifting mechanism supporting the second pad and driving the second pad to lift upward; A connecting nut is provided, which is positioned above the second washer. After the valve stem passes through the second washer, the connecting nut and the valve stem are connected and fixed by threads.

2. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 1, characterized in that, The lifting mechanism is a jack.

3. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 2, characterized in that, There are two lifting mechanisms, which are symmetrically distributed with the first through hole as the center.

4. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 2 or 3, characterized in that, The jack can be any one of a screw jack, a hydraulic jack, or an electric jack.

5. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 1, characterized in that, The connecting nut is fixedly mounted on the second washer by welding.

6. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 1, characterized in that, The connecting nut and the second washer are integrally formed.

7. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 1, characterized in that, The connecting nut is rotatably mounted on the second washer, and the outer diameter of the connecting nut is larger than the diameter of the second through hole.

8. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 7, characterized in that, The horizontal cross-section of the connecting nut is hexagonal.

9. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in any one of claims 5 to 8, characterized in that, The connecting nut is integrally provided with a base, the outer diameter of which is larger than the outer diameter of the connecting nut, and the connecting nut contacts the second washer through the base.

10. The emergency opening tool for the isolation valve of the nuclear power plant steam-water separation reheat system as described in claim 1, characterized in that, The thickness of the first gasket and the second gasket is 10mm to 20mm.

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