Fixing device for repairing and grinding inlet valve seat of electromagnetic pilot operated valve of nuclear power plant

Abstract

The utility model discloses a nuclear power plant electromagnetic pilot valve inlet valve seat repairing, grinding and fixing device which comprises a connecting body, and the connecting body comprises a connecting part, a limiting convex part, a guiding part and a threaded part which are sequentially connected from top to bottom. The limiting protruding part is provided with an abutting face used for abutting against an inner boss of the nuclear power plant electromagnetic pilot valve inlet valve seat, and the guiding part is used for penetrating through a bottom outlet of the nuclear power plant electromagnetic pilot valve inlet valve seat. The device further comprises a fixing sleeve located outside the nuclear power plant electromagnetic pilot valve inlet valve seat and used for being connected with the fixing thread part. By applying the device, the valve seat of the inlet valve of the electromagnetic pilot operated valve of the nuclear power plant can be directly fixed on a lathe to process the sealing surface, the deflection of the sealing surface caused by stress release and the like can be quickly eliminated, and the maintenance efficiency is improved. The repairing, grinding and fixing device for the inlet valve seat of the electromagnetic pilot operated valve of the nuclear power plant is relatively simple in structure, low in manufacturing cost, convenient to use and good in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a repairing, grinding and fixing device for a valve seat of an inlet valve of an electromagnetic pilot valve in a nuclear power plant. Background Art

[0002] The DMS6 solenoid pilot valve has a special inlet valve seat structure. Its inlet and outlet flow channels are arranged in an L-shaped structure, and the overall structural shape is irregular, which makes it difficult to ensure secure fixation during maintenance. The valve seat is prone to shaking during the grinding process, resulting in poor actual grinding effect. In addition, due to its irregular structure, the center of gravity is unstable, which can easily cause the sealing surface to deflect during the grinding process, resulting in poor grinding efficiency, and easy to consume additional sealing surface, reducing the service life of the valve seat. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant.

[0004] The technical solution adopted by the utility model to solve the technical problem is as follows: constructing a repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant, comprising a connecting body for penetrating the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant, the connecting body comprising a connecting portion, a limiting protrusion, a guide portion and a threaded portion connected in sequence from top to bottom; the limiting protrusion is provided with an abutting surface for abutting against the inner boss of the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant, and the guide portion is used to penetrate the bottom outlet of the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant;

[0005] The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant further comprises a fixing sleeve located outside the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant and used for connecting and fixing the threaded portion.

[0006] In some embodiments, the connecting portion is used to connect to a socket wrench, and the connecting portion is a polygonal columnar structure.

[0007] In some embodiments, the polygonal columnar structure includes at least one of a quadrilateral columnar structure, a pentagonal columnar structure, or a hexagonal columnar structure.

[0008] In some embodiments, the abutting surface is the lower surface of the limiting protrusion, and the abutting surface is a plane.

[0009] In some embodiments, the connecting portion, the limiting protrusion, the guide portion, and the threaded portion are coaxially arranged.

[0010] In some embodiments, the connector is a one-piece structure.

[0011] In some embodiments, the fixed sleeve has a columnar structure and has a connecting cavity, the connecting cavity includes a first cavity and a second cavity axially connected, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, and the second cavity is provided with an internal threaded surface that cooperates with the threaded portion.

[0012] In some embodiments, a portion of the outer side surface of the fixing sleeve close to the bottom thereof is concave toward the axis of the fixing sleeve to form a limiting groove.

[0013] In some embodiments, the fixing sleeve is an integral structure.

[0014] In some embodiments, the connector and the fixing sleeve are both metal parts.

[0015] The implementation of this utility model has the following beneficial effects: The valve seat repair, grinding, and fixing device for the inlet valve of a nuclear power plant electromagnetic pilot valve can be directly fixed on a lathe for machining the sealing surface, quickly eliminating sealing surface deflection caused by stress release and other factors, thereby improving maintenance efficiency. The valve seat repair, grinding, and fixing device for the inlet valve of a nuclear power plant electromagnetic pilot valve has a relatively simple structure, low manufacturing cost, ease of use, and excellent practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 This is a structural diagram of the valve seat of the inlet valve of the electromagnetic pilot valve in a nuclear power plant;

[0018] Figure 2 Schematic diagram of the application of the valve seat repairing and grinding fixture of the inlet valve of the electromagnetic pilot valve of a nuclear power plant in some embodiments of the present invention;

[0019] Figure 3 This is one of the structural diagrams of the connector in some embodiments of the present invention;

[0020] Figure 4 This is the second structural diagram of the connector in some embodiments of the present invention;

[0021] Figure 5 This is one of the structural diagrams of the fixed sleeve in some embodiments of the present utility model;

[0022] Figure 6This is the second structural diagram of the fixed sleeve in some embodiments of the present utility model;

[0023] Figure 7 This is a schematic diagram of the size parameters of the connector in some embodiments of the present invention;

[0024] Figure 8 It is a schematic diagram of the size parameters of the fixed sleeve in some embodiments of the present invention. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] See Figure 1 , is a structural schematic diagram of the inlet valve seat of the electromagnetic pilot valve of a nuclear power plant. The inlet valve seat of the electromagnetic pilot valve of a nuclear power plant includes but is not limited to the DMS6 type electromagnetic pilot valve inlet valve seat, wherein the inlet valve seat of the electromagnetic pilot valve of a nuclear power plant has an inlet portion 101, and the end face of the inlet portion 101 is a sealing surface 102. The inlet valve seat of the electromagnetic pilot valve of a nuclear power plant also has an outlet portion 103, and the inlet portion 101 and the outlet portion 103 form an L-shaped flow channel. The inlet valve seat of the electromagnetic pilot valve of a nuclear power plant also has a bottom outlet 104, and the bottom outlet 104 is coaxially arranged with the inlet portion 101. The inlet valve seat of the electromagnetic pilot valve of a nuclear power plant is provided with an inner boss 105, and the inner boss 105 is arranged close to the bottom outlet 104.

[0029] See Figures 2 to 8 The present invention discloses a device for repairing, grinding, and fixing the valve seat of an electromagnetic pilot valve in a nuclear power plant. The device comprises a connector 10 for penetrating the valve seat 100 of the electromagnetic pilot valve inlet of the nuclear power plant. The connector 10 comprises, sequentially from top to bottom, a connecting portion 11, a position-limiting protrusion 12, a guide portion 13, and a threaded portion 14. The connecting portion 11, the position-limiting protrusion 12, the guide portion 13, and the threaded portion 14 are coaxially arranged. The position-limiting protrusion 12 is provided with an abutting surface 121 for abutting against an inner boss 105 of the valve seat 100 of the electromagnetic pilot valve inlet of the nuclear power plant. The guide portion 13 is used to penetrate the bottom outlet 104 of the valve seat 100 of the electromagnetic pilot valve inlet of the nuclear power plant.

[0030] The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant further comprises a fixing sleeve 20 located outside the valve seat 100 of the inlet valve of the electromagnetic pilot valve of the nuclear power plant and used for connecting and fixing the threaded portion 14 .

[0031] like Figure 3 and Figure 4 As shown, in some embodiments, the connecting portion 11 is used to connect with a socket wrench. When the connecting body 10 is used, its upper portion protrudes from the end face of the inlet portion 101 to avoid interference with the grinding and repair operation of the sealing surface 102. Therefore, when the connecting body 10 is used, its upper structure needs to be inside the valve seat 100 of the inlet valve of the electromagnetic pilot valve of the nuclear power plant. The staff cannot tighten it by hand or reinforce it with a conventional wrench. The connecting portion 11 is provided and can be used to connect with a socket wrench, thereby realizing reinforcement between the connecting body 10 and the fixed sleeve 20.

[0032] In some embodiments, the connecting portion 11 is a polygonal columnar structure.

[0033] In some embodiments, the polygonal columnar structure comprises at least one of a quadrangular columnar structure, a pentagonal columnar structure, or a hexagonal columnar structure. Preferably, the polygonal columnar structure is a hexagonal columnar structure, which can be adapted to a six-inner-groove sleeve wrench for reinforcement.

[0034] As shown in Figure 3 and Figure 4 In some embodiments, the abutting surface 121 is a lower surface of the limiting protrusion 12, and the abutting surface 121 is a plane. The cross-sectional shape of the limiting protrusion 12 can be substantially isosceles trapezoidal, with a maximum outer diameter greater than that of the guide portion 13.

[0035] As shown in Figure 3 and Figure 4 In some embodiments, the guide portion 13 is substantially cylindrical, with an outer diameter similar to that of the inner diameter of the bottom outlet 104 of the nuclear power plant electromagnetic pilot valve inlet valve seat 100. The guide portion 13 is provided to ensure the coaxiality of the connecting body 10 with the inlet portion 101 and the bottom outlet 104, ensuring that the entire device is assembled on one axis.

[0036] In some embodiments, the connecting body 10 is a one-piece structure.

[0037] As shown in Figure 7 , the size of the connecting body 10 in some embodiments, the overall length of the connecting body 10 can be 55 mm. Among them, the maximum transverse dimension of the connecting portion 11 can be 16 mm, and the thickness of the connecting portion 11 can be 10 mm. The minimum outer diameter of the limiting protrusion 12 can be 19 mm, the maximum outer diameter of the limiting protrusion 12 can be 23.8 mm, and the thickness of the limiting protrusion 12 can be 5 mm. The outer diameter / diameter of the guide portion 13 can be 19.84 mm. The specification of the threaded portion 14 can be M18. Of course, the size of the connecting body 10 can also be adjusted according to actual needs, which is not specifically limited here.

[0038] As shown in Figure 5 and Figure 6 In some embodiments, the fixing sleeve 20 is in a columnar structure, for example, the fixing sleeve 20 can be substantially cylindrical, to facilitate fixing the nuclear power plant electromagnetic pilot valve inlet valve seat 100 on a lathe when in use, thereby processing the sealing surface 102.

[0039] The fixed sleeve 20 has a connecting cavity 21, which includes a first cavity 211 and a second cavity 212 axially connected. The inner diameter of the first cavity 211 is larger than the inner diameter of the second cavity 212. The first cavity 211 is used to accommodate the portion of the guide portion 13 protruding from the valve seat 100 of the inlet valve of the nuclear power plant electromagnetic pilot valve. The second cavity 212 is provided with an internal threaded surface that matches the external threaded surface of the threaded portion 14.

[0040] In some embodiments, the outer side surface of the fixing sleeve 20 near the bottom thereof is concave toward the axis of the fixing sleeve 20 to form a limiting groove 22. Figure 5 As shown, the retaining grooves 22 can be two symmetrically arranged about the axis of the fixed sleeve 20, and each retaining groove 22 has a retaining surface 221 for secure engagement with a vise. It is understood that the bottom of the fixed sleeve 20 is machined flat, which can be used to secure the fixed sleeve 20 to a maintenance vise for performing sealing surface grinding.

[0041] In some embodiments, the fixing sleeve 20 is an integral structure.

[0042] like Figure 8 As shown, in some embodiments, the dimensions of the fixing sleeve 20 are as follows: the overall length of the fixing sleeve 20 is 50 mm. The thickness of the first cavity 211 is 10 mm, and the inner diameter of the first cavity 211 is 21 mm. The thickness of the second cavity 212 is 40 mm, and the thread specification is M18. Of course, the dimensions of the fixing sleeve 20 can be adjusted appropriately according to actual needs and are not specifically limited here.

[0043] In some embodiments, the connector 10 and the fixing sleeve 20 are both metal parts, for example, they can be made of stainless steel, stainless steel materials include but are not limited to 304 stainless steel or 316 stainless steel. Of course, the connector 10 and the fixing sleeve 20 can also be made of brass, which is not specifically limited here.

[0044] It can be understood that the application of the nuclear power plant electromagnetic pilot valve inlet valve seat repair grinding fixture is convenient for fixing the nuclear power plant electromagnetic pilot valve inlet valve seat 100 when performing grinding work to prevent the nuclear power plant electromagnetic pilot valve inlet valve seat 100 from shaking. In addition, when the nuclear power plant electromagnetic pilot valve inlet valve seat 100 has a large deflection, the nuclear power plant electromagnetic pilot valve inlet valve seat repair grinding fixture can be conveniently fixed on a lathe to perform rack work on the nuclear power plant electromagnetic pilot valve inlet valve seat 100.

[0045] The nuclear power plant electromagnetic pilot valve inlet valve seat repair and grinding fixing device can quickly complete the installation and fixing of the nuclear power plant electromagnetic pilot valve inlet valve seat 100, and quickly realize the repair and grinding work. The device is convenient to use, and can minimize unnecessary consumption of the sealing surface 102.

[0046] In addition, due to the irregular structure and shape of the nuclear power plant electromagnetic pilot valve inlet valve seat 100, it is difficult to align when clamped on the lathe, whether a four-jaw lathe or a three-jaw lathe is used. The nuclear power plant electromagnetic pilot valve inlet valve seat repair and grinding fixing device is convenient to clamp and fix and align, so that the nuclear power plant electromagnetic pilot valve inlet valve seat 100 can be directly fixed on the lathe to process the sealing surface 102, and the nuclear power plant electromagnetic pilot valve inlet valve seat repair and grinding fixing device can quickly eliminate the deflection of the sealing surface 102 caused by stress release and the like, and improve the maintenance efficiency. The nuclear power plant electromagnetic pilot valve inlet valve seat repair and grinding fixing device has a relatively simple structure, low manufacturing cost, convenient use, and good practicality.

[0047] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application; It should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which belong to the protection scope of the present application; Therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A repairing and grinding device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant, characterized in that: The invention comprises a connecting body (10) for penetrating the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant, wherein the connecting body (10) comprises a connecting portion (11), a limiting protrusion (12), a guide portion (13) and a threaded portion (14) connected in sequence from top to bottom; the limiting protrusion (12) is provided with an abutting surface (121) for abutting against an inner boss of the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant, and the guide portion (13) is used for penetrating the bottom outlet of the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant; The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant further comprises a fixing sleeve (20) located outside the valve seat of the inlet valve of the electromagnetic pilot valve of the nuclear power plant and used for connecting and fixing the threaded portion (14).

2. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The connecting portion (11) is used for connecting to a socket wrench, and the connecting portion (11) is a polygonal columnar structure.

3. The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 2 is characterized in that: The polygonal columnar structure includes at least one of a quadrilateral columnar structure, a pentagonal columnar structure or a hexagonal columnar structure.

4. The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 3 is characterized in that: The abutting surface (121) is the lower surface of the limiting protrusion (12), and the abutting surface (121) is a plane.

5. The repairing, grinding and fixing device for the valve seat of the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The connecting portion (11), the limiting protrusion (12), the guiding portion (13) and the threaded portion (14) are coaxially arranged.

6. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The connector (10) is an integrated structure.

7. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The fixed sleeve (20) has a columnar structure and has a connecting cavity (21). The connecting cavity (21) includes a first cavity (211) and a second cavity (212) connected axially. The inner diameter of the first cavity (211) is larger than the inner diameter of the second cavity (212). The second cavity (212) is provided with an internal threaded surface that matches the threaded portion (14).

8. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: A portion of the outer side surface of the fixing sleeve (20) close to the bottom thereof is concave inwardly toward the axis of the fixing sleeve (20) to form a limiting groove (22).

9. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The fixing sleeve (20) is an integrated structure.

10. The valve seat repairing, grinding and fixing device for the inlet valve of the electromagnetic pilot valve of a nuclear power plant according to claim 1 is characterized in that: The connecting body (10) and the fixing sleeve (20) are both metal parts.

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