Spring force release compression device for main valve of isolation release valve of nuclear power plant

Abstract

The utility model discloses a spring force release compression device for a main valve of an isolation release valve of a nuclear power plant. The spring force release compression device comprises a connecting bolt, a sleeving nut and an operating rod, the connecting bolt is columnar and comprises a first threaded part, a guide part and a second threaded part which are sequentially and axially connected, the first threaded part, the guide part and the second threaded part are coaxially arranged, the first threaded part is used for being connected with the valve body bolt hole, the guide part is used for being arranged in the valve deck bolt hole in a penetrating mode, and the second threaded part protrudes out of the valve deck bolt hole; the sleeving nut is used for being arranged on the second threaded part in a sleeving mode and is in an annular cylinder shape, and a plurality of inserting holes matched with the operating rod are formed in the circumferential side wall of the sleeving nut at intervals. By means of the device, quick release and compression of spring force can be achieved, the risk of thread seizure in the actual execution process is avoided, the maintenance efficiency can be improved, the device is convenient to install and operate, the number of maintenance personnel needing to be operated can be effectively reduced, and the maintenance efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a spring force releasing and compressing device for a main valve of an isolation release valve in a nuclear power plant. Background Art

[0002] like Figure 1 As shown, the isolation release valve main valve 100 of the related art (such as the VDA isolation release valve main valve) includes a valve body 101 and a valve cover 102, with a spring 103 arranged between the two. When the isolation release valve main valve 100 is disassembled for maintenance, the main valve spring force needs to be released (during disassembly) and compressed (during assembly). The spring has large elastic force and size. The original spring force release and compression process designed and provided by the manufacturer uses four M10 bolts 104 to compress and release the spring force during maintenance. In actual use, it is found that this method has the following disadvantages:

[0003] 1. The spring 103 of the isolation release valve main valve 100 has large elastic force and size. After the bolts and nuts of the valve cover 102 are removed, only four M10 bolts 104 are used to cooperate with the nuts to compress the spring force, which has the defect of a small horse pulling a big cart. As a result, the four M10 bolts 104 and nuts are subjected to large forces, and it is difficult to operate when releasing and compressing the spring force through the nuts. During the actual maintenance process, it is often the case that the threads are damaged due to excessive force, resulting in the four M10 bolts 104 and nuts being stuck, affecting the progress of on-site maintenance.

[0004] 2. The four M10 bolts 104 used are small in size and have a small thread pitch, while the spring 103 of the isolation release valve main valve 100 is large in size and requires a long release and compression stroke, resulting in slow progress in actual use and implementation, affecting on-site maintenance efficiency.

[0005] 3. During the actual operation, when releasing and compressing the spring force, the nuts corresponding to the four M10 bolts 104 need to be loosened or tightened synchronously to ensure that the valve cover 102 can be lifted and lowered smoothly. Otherwise, once the valve cover 102 is deflected, the four M10 bolts 104 may be bent or the M10 bolts 104 at one end may be unevenly stressed, which may increase the risk of the M10 bolts 104 and nuts being stuck. This operation requires four people to operate simultaneously, and the operation needs to be continuously adjusted according to the deflection of the valve cover 102. In addition, the limited on-site maintenance space restricts the personnel's standing position, which is time-consuming and inconvenient to operate. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a spring force releasing and compressing device for a main valve of an isolation release valve of a nuclear power plant.

[0007] The technical solution adopted by the utility model to solve the technical problem is: constructing a spring force release and compression device for a main valve of an isolation release valve of a nuclear power plant, comprising a connecting bolt, a sleeve nut and an operating rod;

[0008] The connecting bolt is columnar and includes a first threaded portion, a guide portion, and a second threaded portion that are axially connected in sequence. The first threaded portion, the guide portion, and the second threaded portion are coaxially arranged. The first threaded portion is used to connect to the valve body bolt hole, the guide portion is used to penetrate the valve cover bolt hole, and the second threaded portion protrudes from the valve cover bolt hole.

[0009] The sleeve nut is used to be sleeved on the second threaded portion. The sleeve nut is annular and cylindrical. A plurality of insertion holes that match the operating rod are provided at intervals on the circumferential side wall of the sleeve nut.

[0010] In some embodiments, an outer surface of the first threaded portion is provided with an M42 thread.

[0011] In some embodiments, an outer surface of the second threaded portion is provided with an M42 thread.

[0012] In some embodiments, the axial length of the first threaded portion is 60 mm, the axial length of the guide portion is 300 mm, and the axial length of the second threaded portion is 640 mm.

[0013] In some embodiments, the outer surface of the guide portion is a smooth surface.

[0014] In some embodiments, the operating rod is columnar and includes a rod-shaped body, and an axial end surface of the rod-shaped body is provided with a protrusion that matches the plug hole.

[0015] In some embodiments, the rod-shaped body is coaxially arranged with the protrusion.

[0016] In some embodiments, the axial length of the rod-shaped body is 150 mm, and the axial length of the protrusion is 11 mm.

[0017] In some embodiments, the rod-shaped body and the protrusion are both cylindrical.

[0018] In some embodiments, the diameter of the rod-shaped body is 15 mm, and the diameter of the protrusion is 9.5 mm.

[0019] The implementation of the utility model has the following beneficial effects: the application of the nuclear power plant isolation release valve main valve spring force release and compression device can realize the rapid release and compression of the spring force, there is no risk of thread biting during the actual implementation process, and the maintenance efficiency can be improved. The device is easy to install and operate, which can effectively reduce the number of maintenance personnel required to operate, and further improve the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0021] Figure 1 It is a structural diagram of the main valve of the isolation release valve in the related art;

[0022] Figure 2 It is a schematic structural diagram of the connecting bolts in some embodiments of the present invention;

[0023] Figure 3 This is a schematic diagram of the dimensions of the connecting bolts in some embodiments of the present invention;

[0024] Figure 4 This is one of the structural diagrams of the socket nut in some embodiments of the present utility model;

[0025] Figure 5 This is the second structural diagram of the sleeve nut in some embodiments of the present utility model;

[0026] Figure 6 It is a schematic diagram of the dimensions of the socket nuts in some embodiments of the present invention;

[0027] Figure 7 This is one of the structural diagrams of the operating lever in some embodiments of the present utility model;

[0028] Figure 8 This is the second structural diagram of the operating lever in some embodiments of the present utility model;

[0029] Figure 9 This is one of the schematic diagrams of the dimensions of the operating lever in some embodiments of the present invention;

[0030] Figure 10 This is one of the size diagrams of the operating rod in some embodiments of the present invention. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0032] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be internal connections between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only used to facilitate the description of the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and "third" can explicitly or implicitly include one or more of these features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0034] See Figures 2 to 10 The utility model shows a nuclear power plant isolation release valve main valve spring force release and compression device, which is applicable to but not limited to the VDA isolation release valve main valve spring force release and compression.

[0035] The spring force releasing and compressing device of the main valve of the isolation release valve of a nuclear power plant comprises a connecting bolt 10 , a sleeve nut 20 and an operating rod 30 .

[0036] The connecting bolt 10 is cylindrical and includes a first threaded portion 11, a guide portion 12 and a second threaded portion 13 that are axially connected in sequence. The first threaded portion 11, the guide portion 12 and the second threaded portion 13 are coaxially arranged. The first threaded portion 11 is used to connect the valve body bolt hole, and the guide portion 12 is used to penetrate the valve cover bolt hole 1021 (see FIG. Figure 1 ), the second threaded portion 13 protrudes from the valve cover bolt hole 1021.

[0037] The sleeve nut 20 is used to be sleeved on the second threaded portion 13 . The sleeve nut 20 is annular and cylindrical. A plurality of insertion holes 21 that cooperate with the operating rod 30 are spaced apart on the circumferential sidewall of the sleeve nut 20 .

[0038] The application of the nuclear power plant isolation release valve main valve spring force release and compression device can achieve rapid release and compression of spring force. There is no risk of thread seizure during actual implementation, which can improve maintenance efficiency. The device is easy to install and operate, which can effectively reduce the number of maintenance personnel required to operate and further improve maintenance efficiency.

[0039] In some embodiments, the outer surface of the first threaded portion 11 is provided with an M42 thread.

[0040] In some embodiments, the outer surface of the second threaded portion 13 is provided with an M42 thread.

[0041] In some embodiments, the axial length of the first threaded portion 11 is 60 mm, the axial length of the guide portion 12 is 300 mm, and the axial length of the second threaded portion 13 is 640 mm.

[0042] In some embodiments, the diameter of the guide portion 12 is 42 mm. The outer surface of the guide portion 12 is a smooth surface, for example, the outer surface roughness of the guide portion 12 may be Ra1.6.

[0043] In some embodiments, the connecting bolt 10 is an integral structure.

[0044] In some embodiments, the inner surface of the sleeve nut 20 has an M42 thread. The outer diameter of the sleeve nut 20 may be 70 mm, and the thickness of the sleeve nut 20 may be 40 mm. The number of the insertion holes 21 may be multiple, and the multiple insertion holes 21 may be symmetrically arranged one on one. Preferably, there may be eight insertion holes 21, and the eight insertion holes 21 are spaced apart along the circumference of the sleeve nut 20. The insertion holes 21 may be through holes or non-through holes. The inner diameter of the insertion hole 21 may be 10 mm.

[0045] In some embodiments, the outer surface of the sleeve nut 20 may be knurled.

[0046] In some embodiments, the sleeve nut 20 is an integral structure.

[0047] In some embodiments, the operating rod 30 is columnar and includes a rod-shaped body 31 . An axial end surface of the rod-shaped body 31 is provided with a protrusion 32 that matches the insertion hole 21 .

[0048] In some embodiments, the rod-shaped body 31 and the protrusion 32 are coaxially arranged.

[0049] In some embodiments, the axial length of the rod-shaped body 31 is 150 mm, and the axial length of the protrusion 32 is 11 mm.

[0050] In some embodiments, the rod-shaped body 31 and the protrusion 32 are both cylindrical.

[0051] In some embodiments, the diameter of the rod-shaped body 31 is 15 mm, and the diameter of the protrusion 32 is 9.5 mm. Alternatively, the diameter of the protrusion 32 is 9.6 mm, 9.7 mm, 9.8 mm, 9.9 mm, or 10 mm.

[0052] In some embodiments, the operating rod 30 is an integral structure.

[0053] In some embodiments, the connecting bolt 10 , the sleeve nut 20 , and the operating rod 30 may be made of stainless steel or brass.

[0054] The nuclear power plant isolation release valve main valve spring force release compression device has the following advantages:

[0055] (1) The design of the spring force release and compression device of the main valve of the isolation release valve of the nuclear power plant does not use the manufacturer's original reserved spring force compression and release tool installation hole, but uses the valve cover bolt hole 1021 as the installation point. The size of the connecting bolt 10 is similar to the valve cover bolt hole 1021. The first threaded portion 11 of the connecting bolt 10 is screwed into the valve body bolt hole. The diameter of the guide portion 12 can be slightly smaller than the valve cover bolt hole 1021 to play a guiding role in the process of spring force release and compression. The second threaded portion 13 is used to match the sleeve nut 20.

[0056] (2) The sleeve nut 20 is annular cylindrical. The reason is that when it is processed into a conventional hexagonal nut, the M42 thread size nut needs to be rotated with a large wrench, which is inconvenient to operate. The sleeve nut 20 of the present application is annular cylindrical. The sleeve nut 20 is provided with a plug-in hole 21 to cooperate with the operating rod 30. When in use, the sleeve nut 20 is moved by the operating rod 30 to realize the release and compression of the spring 103, which can effectively save space and speed up work efficiency.

[0057] (3) Since the connecting bolts 10 and the sleeve nuts 20 are large in size and have a large contact surface with the valve cover 102, only two sets of the spring force release and compression device of the main valve of the isolation release valve of the nuclear power plant need to be installed symmetrically when used. That is, during the actual implementation process, two people can cooperate to realize the release or tightening operation of the spring force, which saves manpower and makes the operation easier to synchronize.

[0058] (4) The connecting bolt 10 has a large pitch, which can quickly release and compress the spring force. The connecting bolt 10 is large in size and is provided with a guide portion 12 that cooperates with the valve cover bolt hole 1021, effectively avoiding the risk of the connecting bolt 10 and the sleeve nut 20 being stuck during use.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0060] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A spring force release and compression device for the main valve of a nuclear power plant isolation release valve, characterized in that: It comprises a connecting bolt (10), a sleeve nut (20) and an operating rod (30); The connecting bolt (10) is columnar, and comprises a first threaded portion (11), a guide portion (12), and a second threaded portion (13) which are axially connected in sequence. The first threaded portion (11), the guide portion (12), and the second threaded portion (13) are coaxially arranged. The first threaded portion (11) is used to connect to the valve body bolt hole, the guide portion (12) is used to penetrate the valve cover bolt hole, and the second threaded portion (13) protrudes from the valve cover bolt hole. The sleeve nut (20) is used to be sleeved on the second threaded portion (13). The sleeve nut (20) is annular and cylindrical. The circumferential side wall of the sleeve nut (20) is provided with a plurality of insertion holes (21) that match the operating rod (30) at intervals.

2. The spring force release and compression device for the main valve of the isolation and release valve of a nuclear power plant according to claim 1 is characterized in that: The outer surface of the first threaded portion (11) is provided with an M42 thread.

3. The spring force release and compression device for the main valve of the isolation and release valve of a nuclear power plant according to claim 1 is characterized in that: The outer surface of the second threaded portion (13) is provided with an M42 thread.

4. The spring force release and compression device for the main valve of the isolation and release valve of a nuclear power plant according to claim 1 is characterized in that: The axial length of the first threaded portion (11) is 60 mm, the axial length of the guide portion (12) is 300 mm, and the axial length of the second threaded portion (13) is 640 mm.

5. The spring force release and compression device for the main valve of the isolation and release valve of a nuclear power plant according to claim 1 is characterized in that: The outer surface of the guide portion (12) is a smooth surface.

6. The spring force releasing and compressing device for the main valve of the isolation and release valve of a nuclear power plant according to claim 1, characterized in that: The operating rod (30) is columnar and comprises a rod-shaped body (31). The axial end surface of the rod-shaped body (31) is provided with a convex portion (32) that matches the plug hole (21).

7. The nuclear power plant isolation release valve main valve spring force release and compression device according to claim 6, characterized in that: The rod-shaped body (31) and the convex portion (32) are coaxially arranged.

8. The spring force releasing and compressing device for the main valve of the isolation and release valve of a nuclear power plant according to claim 6, characterized in that: The axial length of the rod-shaped body (31) is 150 mm, and the axial length of the protrusion (32) is 11 mm.

9. The nuclear power plant isolation release valve main valve spring force release and compression device according to claim 6, characterized in that: The rod-shaped main body (31) and the convex portion (32) are both cylindrical.

10. The spring force releasing and compressing device for the main valve of the isolation and release valve of a nuclear power plant according to claim 6, characterized in that: The diameter of the rod-shaped body (31) is 15 mm, and the diameter of the convex portion (32) is 9.5 mm.

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