Orifice installation tool for nuclear power plant main feedwater system

Abstract

The utility model discloses a kind of nuclear power plant main feedwater system measuring orifice plate installation tools, it includes spanner, body, bolt piece and locking piece.The nuclear power plant main feedwater system measuring orifice plate installation tool is replaced by being set up spanner, body, bolt piece and locking piece, traditional hammering operation is completely replaced, and torque can be rotated and transmitted by spanner without hammering, avoid installation deviation caused by artificial force difference, improve orifice plate installation precision, guarantee orifice plate valve flow measurement accuracy, and detachable fitting structure of trapezoidal through groove and link block, different body can be replaced according to the size of on-site clamping ring, and it is strong in adaptability, without designing tool for different specifications clamping ring separately.The nuclear power plant main feedwater system measuring orifice plate installation tool overall structure is simple, assembly and disassembly are convenient, and operator can quickly get started without professional training, significantly improve installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of orifice plate installation for the main feedwater system of a nuclear power plant, and in particular to an installation tool for orifice plates for the main feedwater system of a nuclear power plant. Background Technology

[0002] The flow measurement of the main feedwater system in nuclear power plants uses an orifice valve device, and the measurement accuracy of this device directly affects the power generation of the nuclear power plant units. The core component of this type of orifice valve is the orifice plate. In order to fix the orifice plate in a certain position on the valve body, the clamping ring is rotated, and the pressure nut threadedly connected to the clamping ring of the orifice valve is moved to press the orifice plate.

[0003] The original installation method involved using a hammer to strike the pin hole, driving the clamping ring to rotate and thus tightening the hole plate. This method was difficult to control, leading to installation deviations depending on the installer. Furthermore, after repeated hammering, the pin hole would undergo plastic deformation and enlarge, increasing the difficulty of subsequent installation. Additionally, using a hammer made it difficult to control the striking position, easily resulting in misalignment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a tool for installing a measuring orifice plate in the main feedwater system of a nuclear power plant.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a measuring orifice plate installation tool for the main feedwater system of a nuclear power plant, which includes a wrench, a body, a pin, and a locking component; The wrench includes a handle, a connecting rod, and a connecting seat connected in sequence. The lower end of the connecting seat is provided with a trapezoidal through groove. The connecting seat is also provided with a transverse sliding groove and a waist-shaped groove. The transverse sliding groove is connected to the trapezoidal through groove, and the waist-shaped groove is connected to the transverse sliding groove. The main body includes a connecting block and a connecting seat. The connecting block is adapted to fit into the trapezoidal through groove. The connecting block is provided with a locking hole, and the lower end of the connecting seat is provided with a threaded hole. The pin includes an integrally formed threaded section and an extension section. The threaded section is threadedly connected to the threaded hole, and the extension section is used to fit into the pin hole of the orifice plate valve clamping ring of the measuring orifice plate. The locking component includes a locking pin and a lever. The locking pin is slidably disposed in the transverse groove. One end of the lever is connected to the locking pin, and the other end of the lever extends out from the waist-shaped groove. The locking pin is used to insert into the locking hole to lock the body and the wrench.

[0006] In some embodiments, the waist-shaped groove is formed along the length direction of the connecting seat, and the width of the waist-shaped groove is adapted to the diameter of the lever.

[0007] In some embodiments, the lower end face of the connecting seat is a concave arc surface, and the radius of curvature of the concave arc surface is consistent with the radius of curvature of the outer circumferential surface of the orifice plate valve clamping ring.

[0008] In some embodiments, the locking holes are symmetrically arranged on both sides of the connecting block, the axes of the two locking holes are collinear, and the axis of the locking holes coincides with the axis of the transverse slide groove.

[0009] In some embodiments, one end of the locking pin is integrally formed with a cylindrical section, the diameter of which is clearance-fitted with the inner diameter of the locking hole.

[0010] In some embodiments, the lever is vertically connected to the left side of the locking post, and the end of the lever extending out of the waist-shaped groove is provided with an anti-slip protrusion. When the lever moves to the leftmost end, the right end of the locking post is completely disengaged from the locking hole.

[0011] In some embodiments, a cross-shaped fastening groove is provided on the lower end face of the extension section of the pin.

[0012] In some embodiments, the depth of the cross-shaped fastening groove is 2mm-3mm, and the groove width is 1mm-1.5mm.

[0013] In some embodiments, the grip is a cylindrical structure, the length of the grip is 15cm-20cm, and the outer peripheral wall of the grip is provided with a spiral anti-slip texture.

[0014] In some embodiments, the grip, the connecting rod, and the connecting seat are integrally formed from a metal material, wherein the metal material is stainless steel.

[0015] The following are the beneficial effects of implementing this utility model: This orifice plate installation tool for the main feedwater system of a nuclear power plant completely replaces traditional hammering operations by incorporating a wrench, body, pin, and locking component. Torque is transmitted via wrench rotation without hammering, avoiding installation deviations caused by variations in manual force, improving orifice plate installation accuracy, and ensuring the accuracy of orifice valve flow measurement. Furthermore, the detachable interlocking structure of the trapezoidal through-groove and connecting block allows for the replacement of different bodies according to the size of the clamping ring on site, offering strong adaptability and eliminating the need for separate tool design for different clamping ring specifications. The extended section of the pin precisely matches the clamping ring pin hole of the orifice valve, ensuring a rigid connection between the tool and the orifice valve component and preventing slippage during installation. The locking pin inserted into the locking hole further secures the body and wrench, preventing loosening of components during operation and significantly improving installation accuracy. Moreover, the threaded section of the pin connects to the body via threads, allowing for the replacement of the pin for different sized clamping ring pin holes, further expanding the tool's applicability and reducing equipment procurement costs. In addition, the lever extends from the slotted groove, allowing operators to quickly lock and unlock the device without additional tools. This single-person operation is ideal for the confined spaces of nuclear power plants, significantly improving installation efficiency. The overall structure of this nuclear power plant main feedwater system orifice plate installation tool is simple, facilitating assembly and disassembly. Operators can quickly learn to use it without specialized training, greatly enhancing installation efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model 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: Figure 1 This is an overall structural diagram of the orifice plate installation tool for the main feedwater system of a nuclear power plant in some embodiments of this utility model; Figure 2 This is an exploded view of the components of the orifice plate installation tool for the main feedwater system of a nuclear power plant in some embodiments of this utility model; Figure 3 This is a schematic diagram of the structure of the wrench in some embodiments of this utility model; Figure 4 This is a schematic diagram of the structure of the main body in some embodiments of this utility model; Figure 5 This is a schematic diagram of the structure of the pin component in some embodiments of this utility model; Figure 6 This is a structural schematic diagram of the locking component in some embodiments of this utility model. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] Please see Figures 1 to 6This invention relates to a tool for installing a measuring orifice plate in a nuclear power plant's main feedwater system, as described in some embodiments of the present invention. The tool includes a wrench 1, a body 2, a pin 3, and a locking element 4. The wrench 1 comprises a handle 11, a connecting rod 12, and a connecting seat 13 connected in sequence. The lower end of the connecting seat 13 has a trapezoidal through groove 131, and the connecting seat 13 also has a transverse sliding groove 132 and a waist-shaped groove 133. The transverse sliding groove 132 communicates with the trapezoidal through groove 131, and the waist-shaped groove 133 communicates with the transverse sliding groove 132. The body 2 includes a connecting block 21 and a connecting seat 22. The connecting block 21 is fitted into the trapezoidal through groove 131, and the connecting block 21 has a locking hole 211. The lower end of the connecting seat 22 has a threaded hole 221. The pin 3 includes an integrally formed threaded section 31 and an extension section 32. The threaded section 31 is threadedly connected to the threaded hole 221, and the extension section 32 is used to fit into the pin hole of the orifice plate valve clamping ring of the measuring orifice plate. The locking component 4 includes a locking pin 41 and a lever 42. The locking pin 41 is slidably disposed in the transverse groove 132. One end of the lever 42 is connected to the locking pin 41, and the other end of the lever 42 extends out from the waist-shaped groove 133. The locking pin 41 is used to insert into the locking hole 211 to lock the body 2 and the wrench 1.

[0020] Specifically, the orifice plate installation tool for the main feedwater system of the nuclear power plant completely replaces the traditional hammering operation by setting up a wrench 1, a body 2, a pin 3, and a locking part 4. Torque can be transmitted by rotating the wrench 1 without hammering, avoiding installation deviations caused by differences in manual force, improving the installation accuracy of the orifice plate, and ensuring the accuracy of orifice plate valve flow measurement. In addition, the detachable fitting structure of the trapezoidal through groove 131 and the connecting block 21 allows for the replacement of different bodies 2 according to the size of the clamping ring on site, which is highly adaptable and eliminates the need to design separate tools for different specifications of clamping rings. The connecting block 21 fits into the trapezoidal through slot 131. The trapezoidal structure prevents the body 2 from falling off the connecting seat 13 during fitting, achieving initial positioning of the body 2 and the wrench 1 and avoiding radial offset. The extension section 32 of the pin 3 precisely matches the clamping ring pin hole of the orifice valve, ensuring a rigid connection between the tool and the orifice valve components and preventing slippage during installation. The locking pin 41, inserted into the locking hole 211, further secures the body 2 and the wrench 1, preventing loosening of components during operation and significantly improving installation accuracy. Furthermore, the threaded section 31 of the pin 3 is connected to the body 2 via threads, allowing for replacement of the pin 3 for clamping ring pin holes of different sizes, further expanding the tool's applicability and reducing equipment procurement costs. In addition, the lever 42 extends from the waist-shaped slot 133, allowing operators to quickly lock and unlock the device without additional tools. This allows for single-person assembly and disassembly operations, making it particularly suitable for the confined equipment spaces of nuclear power plants and improving installation efficiency. The orifice plate installation tool for the main feedwater system of the nuclear power plant has a simple overall structure, is easy to assemble and disassemble, and can be quickly mastered by operators without professional training, which significantly improves installation efficiency.

[0021] like Figure 3 As shown, the waist-shaped groove 133 is formed along the length of the connecting seat 13, and the width of the waist-shaped groove 133 is adapted to the diameter of the lever 42. The waist-shaped groove 133 provides the lever 42 with a complete sliding stroke, ensuring that the locking pin 41 can be fully inserted into or disengaged from the locking hole 211, avoiding insecure locking or incomplete unlocking due to insufficient stroke. The width of the waist-shaped groove 133 is adapted to the diameter of the lever 42, which can limit the radial wobble of the lever 42, prevent the lever 42 from deviating during operation and causing the locking pin 41 to jam, and improve the operating feel and reliability.

[0022] like Figure 4 As shown, the lower end face of the connecting seat 22 is a concave arc surface. The radius of curvature of the concave arc surface is consistent with the radius of curvature of the outer circumference of the orifice valve clamping ring, so as to achieve a tight fit between the connecting seat 22 and the orifice valve clamping ring. The design that the radius of curvature of the concave arc surface is consistent with the outer circumference of the orifice valve clamping ring achieves a tight fit between the connecting seat 22 and the orifice valve clamping ring. The increased contact area can evenly distribute the torque transmitted by the wrench 1 to the surface of the clamping ring, avoiding excessive local force that could cause deformation of the clamping ring and protecting the equipment from damage. The tight fit also prevents the connecting seat 22 and the orifice valve clamping ring from sliding relative to each other during operation, ensuring efficient torque transmission and avoiding reduced installation efficiency or positional deviation caused by sliding.

[0023] Preferably, the locking holes 211 are symmetrically arranged on both sides of the connecting block 21, the axes of the two locking holes 211 are collinear, and the axis of the locking holes 211 coincides with the axis of the transverse slide groove 132. The symmetrical locking holes 211 on both sides allow the locking pin 41 to be easily inserted from two directions, thereby limiting the movement of the body 2 and preventing the body 2 from moving along the trapezoidal through groove 131 during torque transmission, thus ensuring the stability of the tool structure during operation.

[0024] like Figure 6 As shown, one end of the locking pin 41 is integrally formed with a cylindrical section 411. The diameter of the cylindrical section 411 is clearance-fitted with the inner diameter of the locking hole 211 to reduce insertion resistance. The clearance fit can avoid interference fit caused by machining errors, prevent the locking pin 41 from jamming when inserted or withdrawn, improve the smoothness of locking and unlocking operations, and reduce the labor intensity of operators.

[0025] Furthermore, the lever 42 is vertically connected to the left side of the locking pin 41, and the end of the lever 42 extending out of the waist-shaped groove 133 is provided with an anti-slip protrusion; when the lever 42 moves to the leftmost end, the right end of the locking pin 41 is completely disengaged from the locking hole 211. The lever 42 is connected to the left side of the locking pin 41 to ensure that when the lever 42 moves to the leftmost end, the locking pin 41 is completely disengaged from the locking hole 211, and the unlocking is complete, avoiding difficulties in disassembling the main body 2 due to incomplete unlocking. Specifically, the length of the lever 42 is greater than the thickness of the connecting seat 13, ensuring that the part of the lever 42 extending out of the waist-shaped groove 133 is long enough for the operator to operate with their fingers. The anti-slip protrusion increases the friction between the fingers and the lever 42, preventing slippage during operation, which is especially suitable for the oily or humid environment that may exist at nuclear power plant sites, improving operational safety.

[0026] like Figure 5 As shown, the lower end face of the extension section 32 of the pin 3 has a cross-shaped fastening groove 321. The cross-shaped fastening groove 321 is used to fit a standard Phillips screwdriver for disassembling and assembling the pin 3. The depth of the cross-shaped fastening groove 321 is 2mm-3mm, and the groove width is 1mm-1.5mm. The cross-shaped fastening groove 321 fits a standard Phillips screwdriver, eliminating the need for special disassembly and assembly tools. Operators can directly use commonly used tools on site to replace the pin, reducing tool carrying costs and operational complexity. Compared to grooveless or special groove designs, the cross-shaped groove processing technology is mature, which can reduce the manufacturing cost of the pin 3 while improving disassembly and assembly efficiency.

[0027] Preferably, the handle 11 has a cylindrical structure and a length of 15cm-20cm. The outer peripheral wall of the handle 11 is provided with a spiral anti-slip texture. The 15-20cm cylindrical handle 11 is ergonomically designed, allowing for smoother arm exertion when the operator grips it, reducing fatigue caused by prolonged operation. The spiral anti-slip texture significantly increases the friction between the palm and the handle 11, preventing slippage when rotating the wrench 1. This is especially important when transmitting large torques, preventing hand injuries and improving operational safety and torque transmission efficiency.

[0028] The handle 11, connecting rod 12, and connecting seat 13 are integrally formed from a single piece of stainless steel. Stainless steel possesses excellent tensile strength and corrosion resistance, capable of withstanding the large torque required for clamping ring installation, while also withstanding the high temperatures, humidity variations, and slightly corrosive environments of a nuclear power plant, thus extending the service life of the wrench 1. The integral molding process eliminates gaps between the handle 11, connecting rod 12, and connecting seat 13, preventing torque transmission loss or structural breakage due to loose connections, improving the overall structural reliability of the wrench 1, and ensuring long-term stable use.

[0029] Assembly and usage steps of the orifice plate installation tool for the main feedwater system of this nuclear power plant: S1. Select the appropriate pin 3 according to the size of the clamping ring pin hole. Use a Phillips screwdriver to screw the threaded section 31 into the threaded hole 221 of the connecting seat 22 of the body 2 until the threaded section 31 is fully engaged with the threaded hole 221. Move the lever 42 of the locking part 4 to the leftmost end to retract the locking pin 41 into the transverse sliding groove 132. Insert the connecting block 21 of the body 2 into the trapezoidal through groove 131 of the connecting seat 13 of the wrench 1, ensuring that the connecting block 21 fits against the groove wall. Move the lever 42 to the right to insert the cylindrical section 411 at the right end of the locking pin 41 into the locking hole 211 of the body 2, thus completing the locking of the body 2 and the wrench 1. S2. Insert the extension section 32 of the pin 3 into the pin hole of the clamping ring, ensuring that the concave arc surface of the connecting seat 22 of the body 2 is tightly fitted with the outer circumferential surface of the orifice plate valve clamping ring. The operator holds the handle 11 and rotates the wrench 1 to drive the clamping ring to rotate synchronously until the orifice plate is pressed to the preset position. After installation, rotate the wrench 1 in the opposite direction to reset, move the lever 42 to unlock, and then disassemble the tool. S3. If different sizes of clamping rings need to be adapted, simply move lever 42 to unlock, remove the original body 2, replace it with a body 2 of the appropriate size, and then relock it. If the pin 3 is damaged or different pin holes need to be adapted, use a screwdriver to unscrew the old pin 3 and replace it with a new pin 3.

[0030] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A tool for installing a measuring orifice plate in the main feedwater system of a nuclear power plant, characterized in that, It includes a wrench (1), a body (2), a pin (3), and a locking component (4); The wrench (1) includes a handle (11), a connecting rod (12), and a connecting seat (13) connected in sequence. The lower end of the connecting seat (13) is provided with a trapezoidal through groove (131). The connecting seat (13) is also provided with a transverse sliding groove (132) and a waist-shaped groove (133). The transverse sliding groove (132) is connected to the trapezoidal through groove (131), and the waist-shaped groove (133) is connected to the transverse sliding groove (132). The main body (2) includes a connecting block (21) and a connecting seat (22). The connecting block (21) is adapted to fit into the trapezoidal through groove (131). The connecting block (21) is provided with a locking hole (211). The lower end of the connector (22) is provided with a threaded hole (221); The pin (3) includes an integrally formed threaded section (31) and an extension section (32). The threaded section (31) is threadedly connected to the threaded hole (221), and the extension section (32) is used to fit with the pin hole of the orifice plate valve clamping ring of the measuring orifice plate. The locking component (4) includes a locking pin (41) and a lever (42). The locking pin (41) is slidably disposed in the transverse groove (132). One end of the lever (42) is connected to the locking pin (41), and the other end of the lever (42) extends out from the waist-shaped groove (133). The locking pin (41) is used to insert into the locking hole (211) to lock the body (2) and the wrench (1).

2. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The waist-shaped groove (133) is opened along the length direction of the connecting seat (13), and the width of the waist-shaped groove (133) is adapted to the diameter of the lever (42).

3. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The lower end face of the connecting seat (22) is a concave arc surface, and the radius of curvature of the concave arc surface is consistent with the radius of curvature of the outer circumference of the orifice plate valve clamping ring.

4. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The locking holes (211) are symmetrically arranged on both sides of the connecting block (21), the axes of the two locking holes (211) are collinear, and the axis of the locking holes (211) coincides with the axis of the transverse slide (132).

5. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, One end of the locking pin (41) is integrally formed with a cylindrical section (411), the diameter of which is in clearance fit with the inner diameter of the locking hole (211).

6. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The lever (42) is vertically connected to the left of the locking post (41), and the end of the lever (42) extending out of the waist-shaped groove (133) is provided with an anti-slip protrusion. When the lever (42) moves to the leftmost end, the right end of the locking post (41) is completely disengaged from the locking hole (211).

7. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The lower end face of the extension section (32) of the pin (3) is provided with a cross fastening groove (321).

8. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 7, characterized in that, The depth of the cross-shaped fastening groove (321) is 2mm-3mm, and the groove width is 1mm-1.5mm.

9. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The grip (11) is a cylindrical structure, the length of the grip (11) is 15cm-20cm, and the outer peripheral wall of the grip (11) is provided with a spiral anti-slip texture.

10. The orifice plate installation tool for the main feedwater system of a nuclear power plant according to claim 1, characterized in that, The grip (11), the connecting rod (12) and the connecting seat (13) are integrally formed of metal material, which is stainless steel.

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