KR20190000668U - Socket wrench for crown nut for connecting high steam turbine case - Google Patents

Abstract

The present invention relates to a socket wrench for a crown nut for fastening a high pressure steam turbine case, and more particularly, to a socket wrench for a crown nut which fastens a high pressure steam turbine case to a lower end of a high pressure steam turbine case to maintain airtightness of the high pressure steam turbine. A cylindrical nut body having a threaded portion formed on an inner circumferential surface thereof, and a crown nut having a radially-shaped catching groove formed on the upper end of the nut body; A socket wrench for a crown nut for fastening a high-pressure steam turbine case formed so as to engage a tool when fastening or disassembling a crown nut to the stud bolt, the socket wrench for a crown nut comprising a plurality of units and a hexagon wrench A hexagon nut formed at the center of the hexagon nut so as to allow the crown nut to protrude therefrom; a disc body formed close to the outer diameter of the nut body at the center of the hexagon nut; Pressure steam turbine, a stud bolt for fastening the upper and lower connecting flanges formed on the high-pressure steam turbine case, and a crown nut for fastening the crown nut to the crown nut using a socket wrench. Which makes it easy to fasten and disassemble A.

Description

Technical Field [0001] The present invention relates to a socket wrench for a crown nut for fastening a high-pressure steam turbine case,

The present invention relates to a socket wrench for a crown nut for fastening a high pressure steam turbine case and more particularly to a socket wrench for fastening upper and lower connecting flanges formed in a high pressure steam turbine case to prevent high pressure steam produced by a high pressure steam turbine of a power plant from flowing out. To a socket wrench for a crown nut which fastens a high-pressure steam turbine case to facilitate the fastening and disassembling of a crown nut by using a socket wrench among bolts and crown nuts.

In general, a socket wrench for a crown nut for fastening a high-pressure steam turbine case has already been widely disclosed, and a detailed description thereof will be omitted. A registration tool 20-0479888 entitled " Tool for assembling a clamp nut "Quot; -00677297 " fastener having a socket unit ", and " torque adapter "

On the other hand, the "tool for assembling a clamp nut" is used for a turbine and a turbine main valve used in a nuclear power plant or the like, and is used in a state where an outer sleeve is coupled to an inner sleeve so that an air tool and a power tool can be used. There is a problem that it is difficult to work while moving quickly to the next work around, and there is a problem that the manufacturing cost is increased due to the difficult processing.

Further, the "fastener having a socket unit" can easily fit the outer socket into the reaction washer in a state in which the nut is inserted into the inner socket, even if there is a phase shift between the nut and the reaction force washer, It is inconvenient to carry and it is difficult to work in a narrow space.

In addition, the "torque adapter" has a connecting portion for attaching and detaching an axle nut assembled in an axial lever arm, and a fixing protrusion is formed on a plurality of rotating bodies, wherein the fixing protrusion has hexagonal protrusions or A square hollow portion is formed so that the axle nut can be easily attached and detached using a power tool or a wrench. However, it is inconvenient to replace the work tool because it can not be attached and detached with only one tool.

On the other hand, the turbine and turbine main valve of a nuclear power plant are fastened with bolts or nuts. However, when the nut is assembled and disassembled due to the use of the nut, the heated nut is turned by hand. In addition, when the nut is finally disassembled or assembled by using a hydraulic wrench, when a bolt or a nut is manually fastened and disassembled one by one at the beginning of operation, there is a problem that a safety accident that a finger is caught between adjacent nuts occurs. When working carefully to avoid the above-mentioned safety accidents, it takes a long time to work and productivity of the worker is low, and fatigue of the worker is increased. In addition, when the hydraulic equipment fails or the work space is narrow, the hydraulic equipment can not be used properly, so that the fastening and disassembling operation can not be performed.

[Patent Document 0001] Registered Utility Model No. 20-0479888 "Tool for assembling clamp nut" (Announcement 2016.03.17.) [Patent Document 0002] Published Japanese Patent Application No. 10-2012-00677297 " Fastener with Socket Unit " (Published Jun. 25, 2012) [Patent Document 3] Published Japanese Patent Application No. 10-2005-0020366 entitled " Torque Adapter " (Published Mar. 4, 2005).

The object of the present invention is to provide a steam turbine comprising a stud bolt for fastening upper and lower connecting flanges formed in a case of a high-pressure steam turbine and a sock of a crown nut to prevent high-pressure steam produced by a high- So that the fastening and disassembly of the crown nut can be performed conveniently using a wrench.

Another object of the present invention is to provide a socket wrench with a hexagonal nut so that a plurality of tools such as a hexagonal wrench can be conveniently used for fastening and disassembling a crown nut.

According to an aspect of the present invention, there is provided a socket wrench for a crown nut for fastening a high-pressure steam turbine case of a high pressure steam turbine case of the present invention, A bolt; A crown nut having a cylindrical nut body formed on an inner circumferential surface of the screw portion, and a radially shaped catching groove formed along an upper periphery of the nut body; A socket wrench for a crown nut for fastening a high-pressure steam turbine case formed so as to engage a tool when fastening or disassembling a crown nut to the stud bolt, the socket wrench for a crown nut comprising a plurality of units and a hexagon wrench A hexagon nut formed at the center of the hexagon nut so as to allow the crown nut to protrude therefrom; a disc body formed close to the outer diameter of the nut body at the center of the hexagon nut; And a radiating protrusion formed on the base.

In addition, the hexagonal nut is further provided with a hexagonal hollow groove at its center so that a hexagonal wrench can be used.

In addition, the spinneret is characterized in that wrench grooves are formed between the radial projections of the disc body so that crown protrusions formed between the engagement grooves of the crown nut can be inserted.

The socket wrench for a crown nut for fastening a high-pressure steam turbine case of the present invention is a socket bolt for fastening and disassembling a crown nut among stud bolts and crown nuts for fastening upper and lower connecting flanges formed in a casing of a high-pressure steam turbine It is effective.

In addition, since a socket wrench capable of engaging and disengaging the crown nut can use at least one of a plurality of tools and a hexagonal wrench, it is possible to work in a narrow space around the steam turbine.

In addition, by forming a hexagonal nut having a hexagonal hollow groove in the socket wrench, a plurality of eggs can be assembled and used in a plurality of units, and a plurality of units can be used alone without using a plurality of eggs. Since a hexagonal wrench can be used, There is an effect that the utilization efficiency of the battery is improved.

1 is a view showing a fastening member for a high-pressure steam turbine case according to the present invention;
2A) b) shows the socket wrench shown in Fig. 1; Fig.
3 is a view showing an example in which a plurality of units assembled with a plurality of eggs are used in a fastening member for a high-pressure steam turbine case shown in Fig. 1; Fig.
4 is a view showing an example in which a plurality of sockets are used for the socket wrench shown in Fig. 2;
5 is a view showing an example in which a hexagonal wrench is used in the socket wrench shown in Fig. 2;

In order to fully understand the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, the detailed description of the known functions and configurations that are considered to be unnecessarily blurring the gist of the present invention is omitted.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a socket wrench for a crown nut for fastening a high-pressure steam turbine case of the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

A socket wrench (20) for a crown nut for fastening a high pressure steam turbine case according to the present invention comprises a pair of upper and lower connecting flanges (4) and (6) of a high pressure steam turbine case for maintaining the airtightness of a high pressure steam turbine A stud bolt B mounted on the stud bolt; A crown nut 10 in which a threaded portion is formed on an inner circumferential surface of the nut body 8 and a radially shaped catching groove 9 is formed along the periphery of the nut body 8; Is formed so as to be able to engage the tool when fastening or disassembling the crown nut (10) to the stud bolt (B).

A stud bolt (B), a tap bolt, or the like is fixedly installed on the lower side of the upper and lower connecting flanges (4) and (6) by heat. That is, the stud bolts (B) are fixed by being fitted and fixed so that the upper and lower connecting flanges (4) and (6) can be tightly tightened without gaps. The crown nut (10) fastened to the stub bolt (B) prevents the nut from being loosened and tightening force is maintained tightly.

The socket wrench 20 for a crown nut includes a hexagonal nut 12 formed at the center so as to be able to engage a plurality of pieces T1 and a hexagonal wrench T2, And a radial projection protruding radially so as to engage with the engaging groove 9 of the crown nut 10 on the bottom surface of the disc body 16. The disc body 16 has a disc body 16 formed close to the outer diameter of the nut body 8, (18).

Further, the hexagonal nut 12 can be combined with a hand tool or a power tool, so that the socket wrench 20 can be easily used.

The hexagonal nut 12 is further formed with a hexagonal hollow groove 14 at its center so as to use a hexagonal wrench T2. The radial projection 18 is formed in the radial projection 18 of the disk body 16 so that the crown projection 11 formed between the engaging grooves 9 of the crown nut 10 can be inserted. Grooves 17 are formed.

Hereinafter, the operation or use of the socket wrench 20 for a crown nut for fastening the high-pressure steam turbine case according to the present invention will be described in detail.

The high pressure steam turbine case for forming a high pressure steam turbine in a power plant is constructed such that a portion of the upper and lower connecting flanges 4 and 6 is fastened by a plurality of stud bolts B and a crown nut 10 to prevent high- do. The stud bolts B are fixed to the lower connecting flange 6 located at the lower side by a heat shrink method. That is, the stud bolts B are firmly installed in the high-pressure steam turbine case since they are fixed to the lower connection flange 6 by heat shrinkage.

The threaded portion 13 of the stud bolt B is exposed on the upper connecting flange 4 located above the lower connecting flange 6 with the stud bolt B bolted thereto. The crown nut 10 is fastened to the threaded portion 13 so as not to leak high-pressure steam through the upper and lower connecting flanges 4 and 6. The crown nut 10 is fastened by a dedicated socket wrench 20 assembled to one of a plurality of shafts T1 and hexagonal wrenches T2. First, the socket wrench 20 is placed on the crown nut 10 loosely coupled to the stud bolt B with the spinneret 18 facing downward. When the socket wrench 20 is mounted, the radiating projections 18 are inserted into the engagement grooves 9 of the crown nuts 10.

For example, when a plurality of pieces T1 and a plurality of pieces T3 are prepared, as shown in Fig. 3, a plurality of pieces T3 are assembled to the square head protrusion T1a of the plurality of pieces T1, (T3) is inserted into the hexagonal nut (12) on the socket (16), and then the socket wrench (20) is rotated using the plurality of pieces (T1). The crown nut 10 is firmly coupled to the stud bolt B by the rotation of the socket wrench 20. The plurality of pieces (T1) used to rotate the socket wrench 20 may be manually or electrically powered. At this time, the fastening operation of the crown nut 10 with respect to the hot stud bolt B can be safely performed using the socket wrench 20 with a plurality of pieces (T1) through the plurality of eggs T3, and conversely, the disassembly can be performed.

4, the square head protrusion T1a of the plurality (T1) of square tubes is inserted into the hexagonal hollow grooves 14 of the hexagonal nut 12 (T1) in a state in which it is inserted into the plurality of units (T1).

5, when the hexagonal wrench T2 is inserted into the hexagonal hollow groove 14 formed in the hexagonal nut 12 of the socket wrench 20, a socket wrench (not shown) 20) can be used. That is, the crown nut 10 can be fastened to the stud bolt B by turning the hexagon wrench T2 after placing the socket wrench 20 on the crown nut 10 to engage it. Although the fastening of the crown nut 10 to the stud bolt B has been described, the use of the crown nut 10 is also the same as that of the fastening of the crown nut 10. That is, the tool may be rotated in the disassembly direction not in the fastening direction.

As described above, the fastening and disassembling operation of the crown nut 10 using the socket wrench 20 facilitates the use of a tool such as a plurality of tools T1 and a hexagon wrench T2, and the peripheral space of the high- There is an advantage in that the work can be made safe.

The embodiments of the socket wrench for a crown nut for fastening the high-pressure steam turbine case of the present invention described above are merely illustrative, and those skilled in the art will appreciate that various modifications and equivalent It will be appreciated that other embodiments are possible. Therefore, it is to be understood that the present invention is not limited to the form described in the foregoing description. Accordingly, the true scope of protection of the present invention should be determined by the technical idea of the appended claims. It is to be understood that the appended claims are intended to cover all such modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

4,5: Upper and lower connecting flange 8: Nut body
9: Retaining groove 10: Crown nut
9: engaging groove 11: crown projection
12: hexagonal nut 14: hexagonal hollow groove
16: disc body 17: wrench groove
18: Radial projection 20: Socket wrench for crown nut
B: Stud bolt T1: plural
T2: Allen wrench

Claims (3)

A stud bolt (B) mounted on the lower side of the high-pressure steam turbine case upper and lower connecting flanges (4) and (6) so as to maintain the airtightness of the high-pressure steam turbine installed in the power plant; A crown nut 10 in which a threaded portion is formed on an inner circumferential surface of the nut body 8 and a radially formed catching groove 9 is formed along an upper periphery of the nut body 8; A socket wrench (20) for a crown nut for fastening a high pressure steam turbine case formed to be able to engage a tool when fastening or disassembling the crown nut (10) to the stud bolt (B)
The socket wrench 20 for a crown nut includes a hexagon nut 12 formed at the center so as to be able to engage a plurality of tails T1 and hexagon wrenches T2, A disc body 16 formed close to the outer diameter of the body 8 and a radial projection 18 projecting radially so as to engage with the engaging groove 9 of the crown nut 10 on the bottom surface of the disc body 16 The socket wrench for a crown nut for fastening a high pressure steam turbine case according to claim 1,
The method according to claim 1,
In the hexagonal nut (12)
And a hexagonal hollow groove (14) is further formed at the center so as to use the hexagonal wrench (T2). The method according to claim 1,
The radiating projection (18)
Characterized in that wrench grooves (17) are formed between the radiating projections (18) of the disc body (16) so that the crown protrusions (11) formed between the retaining grooves (9) of the crown nut A socket wrench for a crown nut to fasten a high pressure steam turbine case.

Images