KR102535775B1 - Thrust bearing coupling apparatus for turbine of neclear power plant - Google Patents

Abstract

The present invention relates to a thrust bearing coupling structure for a turbine of a nuclear power plant, which supports the shaft of a turbine used for nuclear power generation, and more specifically, to a thrust bearing coupling structure for a turbine of a nuclear power plant, comprising: a bearing cover including a first cover disposed at a position corresponding to one side part of a collar and a second cover disposed at a position corresponding to the other side part of the collar; and a hydraulic bolt for mutually coupling the first cover and the second cover, wherein the first cover has a first through hole passing through the circumferential surface of the first cover in a direction perpendicular to the axial direction of the shaft, and wherein the second cover includes a second small-diameter hole disposed at a position corresponding to the first through hole, passing in a direction perpendicular to the axial direction of the shaft and having a screw thread formed on an inner circumferential surface. The hydraulic bolt includes: a bolt body; an intermediate body; a lower body; and a ring-shaped locking ring screwed to the outer screw thread of the intermediate body, wherein a pressurizing space is provided among the bolt body, the intermediate body, and the lower body to be filled with hydraulic oil flowing along a hydraulic oil movement line. Therefore, provided is a thrust bearing coupling structure of a turbine of a nuclear power plant, wherein a bearing cover for supporting a thrust bearing of a turbine of a nuclear power plant can be installed with a desired torque value even in a small space.

Description

Nuclear turbine thrust bearing coupling structure {Thrust bearing coupling apparatus for turbine of neclear power plant}

The present invention relates to a nuclear turbine thrust bearing fastening structure, and more particularly, to a nuclear turbine thrust bearing fastening structure that can be installed while having a desired torque value even in a small space.

In general, a moisture separator reheater (1) is installed on the secondary side of a nuclear power plant. As shown in FIG. 1, the moisture separation reheater (1) is installed between the high pressure turbine (HP TURBINE) (2) and the low pressure turbine (LPA TURBINE, LPB TURBINE, LPC TURBINE) (3) on the secondary side of the nuclear power plant, In addition, after removing the moisture of the steam discharged from the high-pressure turbine (2), the energy amount of the steam flowing into the low-pressure turbine (3) through the heat exchanger (reheater) is increased.

The high-pressure turbine and the low-pressure turbine each have a shaft, and each shaft is configured to be connected to each other through a coupling means so that the rotational force of the turbine is transmitted. Specifically, the shaft of the turbine is supported in the axial and radial directions between the turbines, and a plurality of bearings are installed for this purpose. Among them, the thrust bearing 700 for supporting the shaft 600 in the axial direction is configured to contact the collar 610 of the shaft 600 and slideably support it, as shown in FIG. 2 .

The nuclear turbine thrust bearing is disposed inside the shaft cover to maintain the shaft 600 in a supported state.

The bearing cover 200 for disposing the bearing 700 used in nuclear power generation therein is composed of a pair of first and second covers 210 and 220, as shown in FIGS. 3 and 4, and each cover ( 210 and 220 are coupled and fixed by the fastening bolt 30. At this time, through-holes 211 and 221 penetrating the circumferential surfaces of the first and second covers are formed, and a fastening bolt 30 having a hexagonal head is inserted into the through-holes to be fastened.

In nuclear power generation, a large rotational force is generated and a large load is applied to a bearing for supporting a shaft, and a housing cover supporting it must be coupled to have a certain fastening force.

However, this prior art has the following problems.

First, the space for fastening the fastening bolt is relatively narrow, so it is difficult to use tools other than a torque wrench. There is a problem in that it is difficult to fix the bearing cover while having a large torque with only such a torque wrench.

In order to solve this problem, in some cases, after inserting the fastening bolt into the through hole, a hammer is used to strike the fastening bolt so that the fastening bolt can be inserted into the through hole with a certain torque or more. There is a problem in that thread deformation is induced and it is not easy to combine the fastening screw into the fastening hole so as to have the desired accurate torque due to the nature of the striking operation.

In addition, there is a problem in that it is difficult to insert and fix the fastening bolt into the through hole so as to have an accurate torque value only with the hammer.

Registered Patent No. 10-1019567 (Announced on March 8, 2011)

The present invention has been created to solve the above problems, and to provide a nuclear turbine thrust bearing fastening structure that enables a bearing cover supporting a thrust bearing of a nuclear turbine to be installed while having a desired torque value even in a narrow space. for technical purposes.

The nuclear turbine thrust bearing fastening structure of the present invention for achieving the above object is a nuclear turbine thrust bearing fastening structure for supporting a turbine shaft used in nuclear power generation,

A bearing cover in which a shaft having a collar is inserted and surrounding a thrust bearing rotatably supporting the collar of the shaft,

A bearing cover including a first cover disposed at a position corresponding to one side of the collar and a second cover disposed at a position corresponding to the other part of the collar; and

Including; hydraulic bolts for coupling the first cover and the second cover to each other,

In the first cover,

A first through hole passing through the circumferential surface of the first cover in a direction perpendicular to the axial direction of the shaft is provided, and the first through hole includes a first large-diameter hole extending inwardly from the circumferential surface of the first cover; A first small-diameter hole having a smaller diameter than one large-diameter hole and extending through the first cover, and a step connecting the lower end of the first large-diameter hole and the upper end of the first small-diameter hole,

The second cover includes a second small-diameter hole disposed at a position corresponding to the first through-hole and passed in a direction perpendicular to the axial direction of the shaft and having a thread formed on an inner circumferential surface,

The hydraulic bolt,

A bolt body composed of a fastening portion provided with a fastening screw thread at an upper portion, a pillar portion extending downward from the fastening portion, and a coupling portion having an engaging screw thread extending downward from the pillar portion and screwed into a second small-diameter hole;

An intermediate body formed in a tubular shape to surround the fastening part, having an inner screw thread screwed to the fastening screw thread on an inner circumferential surface, an outer screw thread on an outer circumference, and a hydraulic oil movement line formed to penetrate the upper and lower ends;

a lower body made of a cup shape in which a central hole is formed to insert a pillar part in the center, slideable in an up and down direction along the pillar part, and a lower surface that can be supported by being caught on a step of the first cover; and

Including a ring-shaped locking ring screwed to the outer screw thread of the intermediate body,

A pressurized space in which hydraulic oil introduced along a hydraulic oil movement line can be filled may be provided between the pillar part of the bolt body, the lower end of the intermediate body, and the upper surface of the lower body.

In the nuclear turbine thrust bearing fastening structure, the locking ring slides downward with the screw thread engaged with the intermediate body when hydraulic oil is filled into the pressurized space and moves upward from the lower body together with the screw body and the intermediate body. By moving, the position of the screw body and the intermediate body can be fixed.

In the nuclear turbine thrust bearing fastening structure,

A rotational groove into which a rotational tool is inserted is formed on the upper surface of the bolt body, and when the rotational tool is inserted into the rotational groove and rotated, the hydraulic bolt rotates and can be inserted into the first through-hole and the second through-hole. .

In the nuclear turbine thrust bearing fastening structure,

The column part,

A small diameter pillar part extending downward from the fastening part, a stop part inclined downward to widen the small diameter pillar part, and a large diameter pillar part extending downward from the stop part and connected to the coupling part,

The central hole of the lower body,

It may have an outer diameter greater than that of the small-diameter pillar part and smaller than that of the large-diameter pillar part.

In the nuclear turbine thrust bearing fastening structure,

The lower body,

It can slide in an up and down direction between a position in contact with the lower surface of the intermediate body and a position where the central hole periphery catches on the stopper.

In the nuclear turbine thrust bearing fastening structure,

In the locking ring,

Ring grooves concave from the upper surface to the lower side are formed spaced apart from each other along the circumferential direction,

A locking tool may be fitted into the ring groove to rotate the locking ring.

In the nuclear turbine thrust bearing fastening structure,

The locking tool,

An arc-shaped locking body having a radius of curvature corresponding to the locking ring;

It extends downward from the bottom surface of the locking body and may include a locking pin disposed at a position corresponding to the ring groove.

In the nuclear turbine thrust bearing fastening structure,

The locking body,

A groove for inserting a tool may be formed through the outer surface and the inner surface and allow an external tool to be inserted.

In the nuclear turbine thrust bearing fastening structure,

A screw thread is formed on the inner circumferential surface of the upper part of the hydraulic oil moving line,

A hydraulic oil supply coupler having a thread formed on an outer circumferential surface may be screwed to the hydraulic oil moving line.

The nuclear turbine thrust bearing fastening structure according to the present invention is rotated and screwed by a tool such as a screwdriver and simultaneously uses a hydraulic structure for applying tension, thereby maximizing the convenience of work even when the installation space is narrow and providing desired torque. It has the advantage of being able to fasten bolts while having.

1 is a schematic diagram showing turbine devices used in nuclear power generation.
2 is a cross-sectional view showing a shaft connection structure of a conventional nuclear turbine.
3 is a perspective view schematically showing a connection between a conventional nuclear turbine shaft and a bearing;
Figure 4 is a cross-sectional view showing a bearing fastening structure in Figure 3;
5 is a perspective view of a hydraulic bolt, which is a component of a nuclear turbine thrust bearing fastening structure according to an embodiment of the present invention.
Figure 6 is a front view of Figure 5;
Fig. 7 is a plan view of Fig. 5;
8 is a view showing the hydraulic bolt and the hydraulic oil supply coupler of FIG. 5;
9 is a view showing a state in which a hydraulic oil supply coupler and a locking tool are coupled to the hydraulic bolt of FIG. 5;
Figure 10 is a perspective view of the locking tool shown in Figure 9;
11 to 13 are perspective views showing a state in which the bearing cover is fixed using the hydraulic bolt of the present invention.

Embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of the present disclosure. The scope of rights according to the present disclosure is not limited to the specific description of the embodiments or these embodiments presented below.

In the present disclosure, 'embodiment' is an arbitrary division for easily explaining the technical idea of the present disclosure, and each of the embodiments need not be mutually exclusive. For example, configurations disclosed in one embodiment may be applied and implemented in other embodiments, and may be applied and implemented with changes without departing from the scope of the present disclosure.

All technical terms and scientific terms used in this disclosure have meanings commonly understood by those of ordinary skill in the art to which this disclosure belongs, unless otherwise defined. All terms used in this disclosure are selected for the purpose of more clearly describing the disclosure and are not selected to limit the scope of rights according to the disclosure.

Expressions such as "comprising", "including", "having", etc. used in this disclosure are open-ended terms that imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. (open-ended terms).

Expressions such as "consisting only of" a corresponding component used in this disclosure should be understood in closed-ended terms excluding the possibility of including other components other than the corresponding component.

Expressions in the singular form described in this disclosure may include plural meanings unless otherwise stated, and this applies equally to expressions in the singular form described in the claims.

Expressions such as "first" and "second" used in the present disclosure are used to distinguish a plurality of elements from each other, and do not limit the order or importance of the elements.

The direction indicator of "axial direction" used in the present disclosure means a direction in which a shaft rotating by receiving a driving force from a turbine extends. In addition, the "corresponding position" means a position where the first cover and the second cover are connected in a line with the first through hole when the second cover is coupled to each other so that the holes are connected to each other.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding elements are given the same reference numerals. In addition, in the description of the following embodiments, overlapping descriptions of the same or corresponding components may be omitted. However, omission of a description of a component does not intend that such a component is not included in an embodiment.

Embodiments are described with reference to examples shown in the accompanying drawings. In the accompanying drawings, identical or corresponding elements are given the same reference numerals. In addition, in the description of the following embodiments, overlapping descriptions of the same or corresponding components may be omitted. However, omission of a description of a component does not intend that such a component is not included in an embodiment.

Embodiments described below and examples shown in the accompanying drawings relate to a fastening structure used for a bearing for supporting a shaft provided in a high-pressure pump used in nuclear power generation and a low-pressure pump, particularly among bearings. It relates to a bearing cover coupling structure in which a thrust bearing for supporting the shaft in the axial direction is provided therein.

A nuclear turbine thrust bearing fastening structure 100 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The nuclear turbine thrust bearing fastening structure 100 according to the present invention includes a bearing cover 200, a hydraulic bolt 300, a locking tool 400, and a hydraulic oil supply coupler 500.

The bearing cover 200 is a bearing cover 200 in which a shaft having a collar is inserted and enclosing a thrust bearing rotatably supporting a collar of the shaft, and a first cover disposed at a position corresponding to one side of the collar. 210 and a second cover 220 disposed at a position corresponding to the other side of the collar.

The first cover 210 has a substantially semicircular ring shape, and an arrangement space in which a bearing is disposed is provided therein.

The first cover 210 is provided with a first through hole passing through the circumferential surface of the first cover 210 in a direction perpendicular to the axial direction of the shaft. The first through hole 211 cooperates with the through hole of the second cover 220 so that the first cover 210 and the second cover 220 are fixedly coupled to each other.

The first through hole 211 includes a first large-diameter hole 211a, a first small-diameter hole 211b, and a step 211c.

The first large-diameter hole 211a extends inward from the circumferential surface of the first cover 210 . The first large-diameter hole 211a has an inner diameter larger than that of the first small-diameter hole 211b and is configured such that the upper portion of the hydraulic bolt 300 is inserted therein.

The first large-diameter hole 211a is configured to extend inwardly from the circumferential surface and preferably has a slightly larger diameter than the upper part of the hydraulic bolt 300. The depth of the first large-diameter hole 211a is configured to have a larger size than the top of the hydraulic bolt 300 so that the hydraulic bolt 300 can be sufficiently inserted.

The first small-diameter hole 211b has a smaller diameter than the first large-diameter hole 211a and extends through the first cover 210 . The first small-diameter hole 211b communicates with the first large-diameter hole 211a and is formed to penetrate the bottom surface of the first cover 210 from the lower end of the first large-diameter hole 211a.

The step 211c is disposed between the large-diameter hole and the small-diameter hole having different diameters, and connects the lower end of the large-diameter hole and the upper end of the small-diameter hole.

This step (211c) is configured to support the lower body 330 of the hydraulic bolt (300).

The second cover 220 has a shape corresponding to that of the first cover 210 and is formed in a substantially semicircular ring shape, and an arrangement space in which a bearing is disposed is provided therein. The first cover 210 and the second cover 220 cooperate with each other to form a ring shape.

A second through hole 221 is formed in the second cover 220 at a position corresponding to the first through hole 211 . Specifically, the second through hole 221 is disposed at a position corresponding to the first through hole 211 and passes in a direction perpendicular to the axial direction of the shaft so that a thread is formed on the inner peripheral surface of the second small diameter hole (not shown). ) is provided.

The second small diameter hole (not shown) is a part to which the coupling screw of the hydraulic bolt 300 is screwed, and the hydraulic bolt 300 is screwed into the second small diameter hole (not shown), so that the first cover 210 ) and the second cover 220 are fixedly coupled to each other.

The hydraulic bolt 300 is for mutually coupling the first cover 210 and the second cover 220, and at the beginning of fastening, the bolt body 310 is rotated to quickly enter the first and second through-holes. After the screwing is completed to some extent, the first cover 210 and the second cover 220 are securely coupled by using hydraulic oil to impart a desired torque.

The hydraulic bolt 300 includes a bolt body 310, an intermediate body 320, a lower body 330 and a locking ring 340.

The bolt body 310 includes a fastening part 311 having fastening screws provided thereon, a pillar part 312 extending downward from the fastening part 311, and extending downward from the pillar part 312, It consists of a coupling portion 313 provided with a coupling screw thread screwed into the second small-diameter hole (not shown).

The fastening part 311, as constituting the upper part of the bolt body 310, is configured such that a male screw thread is formed on the outer circumferential surface in a rod shape. The fastening thread allows the intermediate body 320 to be screwed to the bolt body 310.

A rotation groove 311a into which a rotary tool is inserted is formed at the center of the upper end of the fastening part 311 . A rotary tool such as a torque wrench 800 may be inserted into the groove 311a for rotation. When the rotary tool is inserted into the rotational groove 311a, the hydraulic bolt 300 passes through the first through hole 211 as a whole and is inserted into the second through hole 221 to be screwed together.

The pillar portion 312 extends downward from the fastening portion 311 and has a columnar structure in which separate threads are not formed. The pillar part 312 includes a small-diameter pillar part 312a extending downward from the fastening part 311, a maintenance part 312b inclined downward to widen the small-diameter pillar part 312a, It is composed of a large-diameter pillar portion 312c extending downward from the maintenance portion 312b and connected to the coupling portion 313.

The small-diameter pillar portion 312a has an outer diameter corresponding to that of the fastening portion 311, and is fitted into the central hole 331 of the lower body 330. The lower body 330 is configured to be slidable in the vertical direction while being fitted into the small-diameter pillar portion 312a.

The maintenance part 312b connects the small-diameter pillar part 312a and the large-diameter pillar part 312c to each other, and is configured such that its outer diameter gradually increases toward the lower side. This maintenance part (312b) performs a function of stopping the sliding movement of the lower body (330) fitted to the small-diameter pillar part (312a). That is, the lower body 330, which is inserted into the pillar part 312 through the central hole 331 and slides, is caught in the maintenance part 312b so as not to further descend. Accordingly, in the process of inserting the hydraulic bolt 300 into the first through hole 211, the lower body 330 is prevented from being separated from the bolt body 310.

The large-diameter pillar part 312c extends downward from the maintenance part 312b and is connected to the coupling part 313, and has a larger outer diameter than the small-diameter pillar part and has an outer diameter corresponding to that of the coupling part 313. is composed of

The coupling portion 313 extends downward from the pillar portion 312 and is provided with a coupling screw thread screwed into a second small-diameter hole (not shown).

Specifically, the coupling portion 313 is a portion screwed to the second cover 220 and has an outer diameter corresponding to the second through hole 221 . The coupling screw thread of the coupling part 313 is configured to be screwed into the female screw of the second through hole 221 as a male screw.

In a state where the lower body 330 is caught on the step 211c, the coupling part 313 is screwed into the second through hole 221 so that the first cover 210 and the second cover 220 can be fixedly coupled to each other. there will be

The intermediate body 320 is made of a tubular shape to surround the fastening part 311, and has an inner screw thread screwed to the fastening screw thread on the inner circumferential surface and an outer screw thread on the outer circumference so as to pass through the upper end and the lower end. A hydraulic oil moving line 321 is formed.

Specifically, the intermediate body 320 is disposed between the bolt body 310 and the locking ring 340, and the inner circumferential surface is screwed with the bolt body 310 and the outer circumferential surface is configured to be screwed with the locking ring 340. It is configured so that threads are formed on the inner and outer circumferential surfaces, respectively.

A first sealing 322 for airtightness with the bolt body 310 is provided on the lower inner circumferential surface of the intermediate body 320, and a second sealing ring 322 for airtightness with the lower body 330 is provided on the lower outer circumferential surface of the intermediate body 320. (323) is provided. The first seal 322 is to prevent hydraulic oil introduced into the pressurized space 350 from leaking through between the bolt body 310 and the intermediate body 320, and the second seal 323 prevents hydraulic oil from leaking through the intermediate body 320. ) And to prevent leakage to the outside through the space between the lower body 330.

A screw thread is formed on the inner circumferential surface of the upper part of the hydraulic oil moving line 321 of the intermediate body 320. A hydraulic oil supply coupler 500 having a thread formed on an outer circumferential surface may be screwed to the hydraulic oil moving line 321 . Accordingly, in the process of supplying hydraulic oil through the hydraulic oil supply coupler 500, it is possible to prevent the hydraulic oil from fluctuating or being separated.

The lower body 330 has a cup shape in which a central hole 331 is formed so that the pillar part 312 is inserted in the center, and can slide in the vertical direction along the pillar part 312 . The lower surface of the lower body 330 is configured to be caught and supported by the step 211c of the first cover 210. The lower body 330 is composed of a circular bottom plate and a side plate having a ring shape erected at the edge of the bottom plate as a whole to form a cup shape as a whole.

The lower body 330 is disposed on the pillar part 312 with no thread formed so that it can slide freely along the pillar part 312 in the vertical direction.

At this time, the inner diameter of the central hole 331 of the lower body 330 is equal to or slightly larger than the outer diameter of the small diameter pillar part 312a and smaller than the outer diameter of the large diameter pillar part 312c, so that the small diameter pillar part 312c has a smaller diameter. When inserted into the portion 312a, it stops at the maintenance portion 312b and does not escape downward through the large-diameter pillar portion 312c.

In the lower body 330, a small-diameter pillar portion 312a and a third seal 332 for maintaining airtightness during the slide movement are provided in the periphery of the central hole 331. The third seal 332 is formed in a ring shape and is disposed on the inner circumferential surface of the third central hole 331 of the lower body 330 so that the hydraulic oil filled in the pressurized space 350 flows through the small-diameter pillar portion 312a and the lower body. It passes through the gap between (330) and prevents leakage to the lower side.

In this way, the first seal 322, the second seal 323, and the third seal 332 are configured to seal the gap between the intermediate body 320, the lower body 330, and the bolt body 310, respectively. to maintain the airtightness of the pressurized space 350 formed between the intermediate body 320, the lower body 330, and the bolt body 310, so that the hydraulic oil filled in the pressurized space 350 does not leak out By doing so, when the hydraulic oil is filled in the pressurized space 350, the hydraulic oil does not leak and the intermediate body 320 and the bolt body 310 are relatively movable with respect to the lower body 330 so as to be away from each other.

When the locking ring 340 is filled with hydraulic oil into the pressurized space 350 and relatively moves upward from the lower body 330 together with the screw body and the intermediate body 320, the screw thread in the intermediate body 320 is formed. It slides downward in an engaged state to fix the position of the screw body and the intermediate body 320 . This locking ring 340 is screwed to the outer thread of the intermediate body 320.

Specifically, the locking ring 340 has a female thread formed on the inner surface so that it can be screwed to the outer thread of the intermediate body 320, and is formed in a ring shape as a whole.

The outer diameter of the locking ring 340 is equal to the outer diameter of the lower body 330, and the inner diameter of the locking ring 340 is formed to correspond to the outer diameter of the intermediate body 320.

The locking ring 340 is formed by spaced apart from each other along the circumferential direction of the ring groove 341 concave from the upper surface to the lower side in the upper center. A plurality of concave ring grooves 341 are formed along the circumferential direction. The locking pin of the locking tool 400 is inserted into the concave ring groove 341, and when the locking tool 400 rotates while the locking pin is inserted, the locking ring 340 rotates relative to the intermediate body 320. is configured to

The locking ring 340 is to maintain the height of the lift when the intermediate body 320 is raised relative to the lower body 330 by applying a tensile force to the hydraulic oil, so that the tensile force can be maintained even when the hydraulic oil is removed. .

The locking tool 400 is a dedicated tool for rotating the locking ring 340, and includes an arc-shaped locking pin 410 having a radius of curvature corresponding to the locking ring 340 and the locking pin 410. It extends downward from the bottom surface and includes a locking pin disposed at a position corresponding to the ring groove 341.

The locking pin 410 is formed by cutting a ring in half. The locking pin 410 has a groove for inserting a tool that penetrates the outer and inner surfaces and allows an external tool to be inserted. A slotted screwdriver or other various thin rods are inserted into the groove for inserting the tool so that the locking pin 410 rotates easily.

The locking pins protrude from the edge of the locking pin 410, and a plurality of them are spaced apart from each other along the circumferential direction. A plurality of these locking pins are configured to be inserted into the ring groove 341.

The hydraulic oil supply coupler 500 is inserted into the hydraulic oil movement line 321 of the intermediate body 320 to supply hydraulic oil to the pressurized space 350 so that tension is generated in the hydraulic bolt 300.

The hydraulic oil supply coupler 500 includes a hydraulic pipe 510 through which hydraulic oil passes, and an insertion part 520 disposed at a lower end of the hydraulic pipe 510. The insertion part 520 has a screw thread formed on the outer circumferential surface so that the insertion part 520 can be screwed to the hydraulic oil moving line 321, so that it can be firmly fixed.

The effect of the nuclear turbine thrust bearing fastening structure 100 according to the present invention will be described with reference to FIGS. 11 to 13 as follows.

First, after preparing the bearing cover 200 composed of the first cover 210 and the second cover 220, the first through hole 211 and the second through hole 221 of the bearing cover 200 correspond to each other. As a position, place the hydraulic bolt 300 on the top. (FIG. 11A)

After that, the hydraulic bolt 300 is inserted into the first through hole 211 and the second through hole 221 . Specifically, after inserting the torque wrench 800 into the rotation groove 311a, the torque wrench is rotated so that the coupling screw thread of the bolt body 310 is coupled to the screw thread of the second cover 220. At this time, when the lower body 330 is seated on the step 211c of the first cover 210, the rotation of the torque wrench is stopped. (FIG. 11B)

Then, the hydraulic oil supply coupler 500 is screwed to the hydraulic oil movement line 321 of the intermediate body 320 (Fig. 12 (a)), and the hydraulic oil is supplied through the hydraulic oil supply coupler 500. At this time, As the hydraulic oil flows into the pressurized space 350 between the pillar portion 312 of the bolt body 310, the lower end of the intermediate body 320, and the upper surface of the lower body 330, the lower body 330 has a first cover ( 210) while applying tension to the intermediate body 320 and the bolt body 310. In this process, the locking ring 340 is also separated from the lower body 330 and moves upward. (FIG. 12) (b))

Then, the locking tool 400 is coupled to the ring groove 341 of the locking ring 340. Specifically, the locking pin of the locking out is inserted into the ring groove 341. (Fig. 13 (a)). After that, the locking ring 340 is rotated so that the lower end of the locking ring 340 comes into contact with the upper surface of the lower body 330, so that even if the hydraulic oil is removed, the intermediate body 320 and the bolt body The first cover 210 and the second cover 220 are securely coupled by maintaining the tensile force applied to the 310 .

In the nuclear turbine thrust bearing fastening structure 100 of the present invention, the hydraulic bolt 300 can be quickly inserted into the through holes of the first cover 210 and the second cover 220 using a torque wrench. In addition, hydraulic oil is supplied so that the hydraulic bolt 300 can be firmly coupled to the first cover 210 and the second cover 220 . At this time, the torque applied to the hydraulic bolt 300 can be easily adjusted to a desired degree by precisely adjusting the amount of hydraulic oil supplied, so that a fixing force can be applied as intended by the designer.

Although the present invention has been described in detail with preferred embodiments above, the present invention is not necessarily limited to these embodiments and modifications, and can be variously modified without departing from the technical spirit of the present invention.

1000...bearing fastening structure 200...bearing cover
210 ... first cover 211 ... first through hole
211a ... first large-diameter hole 211b ... first small-diameter hole
211c ... stepped 220 ... second cover
221 ... second through hole
300 ... hydraulic bolt 310 ... bolt body
311 ... fastener 311a ... groove for rotation
312 ... pillar part 312a ... small diameter pillar part
312b...stop portion 312c...large diameter column portion
320 ... intermediate body 321 ... hydraulic oil moving line
322... 1st shilling 323... 2nd shilling
330 ... lower body 331 ... center hole
332... 3rd seal 340... locking ring
341 ... ring groove 350 ... pressurized space
400 ... locking tool 410 ... locking body
420 ... locking pin 500 ... coupler
510 ... hydraulic pipe 520 ... insertion part

Claims (9)

In the nuclear turbine thrust bearing fastening structure for supporting the turbine shaft used in nuclear power generation,
A bearing cover in which a shaft having a collar is inserted and surrounding a thrust bearing rotatably supporting the collar of the shaft,
A bearing cover including a first cover disposed at a position corresponding to one side of the collar and a second cover disposed at a position corresponding to the other part of the collar; and
Including; hydraulic bolts for coupling the first cover and the second cover to each other,
In the first cover,
A first through hole passing through the circumferential surface of the first cover in a direction perpendicular to the axial direction of the shaft is provided, and the first through hole includes a first large-diameter hole extending inwardly from the circumferential surface of the first cover; A first small-diameter hole having a smaller diameter than one large-diameter hole and extending through the first cover, and a step connecting the lower end of the first large-diameter hole and the upper end of the first small-diameter hole,
The second cover is disposed at a position corresponding to the first through hole and includes a second through hole passing in a direction perpendicular to the axial direction of the shaft and having a thread formed on an inner circumferential surface,
The hydraulic bolt,
A bolt body composed of a fastening portion provided with a fastening screw thread at an upper portion, a pillar portion extending downward from the fastening portion, and a coupling portion having a coupling screw thread extending downward from the pillar portion and screwed into the second through hole;
An intermediate body formed in a tubular shape to surround the fastening part, having an inner screw thread screwed to the fastening screw thread on an inner circumferential surface, an outer screw thread on an outer circumference, and a hydraulic oil movement line formed to penetrate the upper and lower ends;
a lower body having a cup shape in which a central hole is formed so that the pillar part is inserted into the center, the lower body being slidable in an upward and downward direction along the pillar part, and the lower surface being hooked and supported by the steps of the first cover; and
Including a ring-shaped locking ring screwed to the outer screw thread of the intermediate body,
A nuclear turbine thrust bearing fastening structure in which a pressurized space in which hydraulic oil flowing along a hydraulic oil movement line can be filled is provided between the pillar part of the bolt body, the lower end of the intermediate body, and the upper surface of the lower body. According to claim 1,
When the locking ring is filled with hydraulic oil into the pressurized space and relatively moves upward from the lower body together with the screw body and the intermediate body, the locking ring slides downward with the screw thread engaged with the intermediate body to position the screw body and the intermediate body. A nuclear turbine thrust bearing fastening structure that fixes the According to claim 1,
A rotary groove into which a rotary tool is inserted is formed on the upper surface of the bolt body, and when the rotary tool is inserted into the rotary groove and rotated, the hydraulic bolt rotates and is inserted into the first through-hole and the second through-hole of the nuclear power turbine. Thrust bearing fastening structure. According to claim 1,
The column part,
A small diameter pillar part extending downward from the fastening part, a stop part inclined downward to widen the small diameter pillar part, and a large diameter pillar part extending downward from the stop part and connected to the coupling part,
The central hole of the lower body,
A nuclear turbine thrust bearing fastening structure, characterized in that it has an outer diameter larger than the small-diameter pillar portion and smaller than the large-diameter pillar portion. According to claim 4,
The lower body,
A nuclear turbine thrust bearing fastening structure, characterized in that it can slide in the vertical direction between a position in contact with the lower surface of the intermediate body and a position where the central hole periphery is caught in the stopper. According to claim 1,
In the locking ring,
Ring grooves concave from the upper surface to the lower side are formed spaced apart from each other along the circumferential direction,
A nuclear turbine thrust bearing fastening structure, characterized in that the locking tool is fitted into the ring groove to rotate the locking ring. According to claim 6,
The locking tool,
An arc-shaped locking body having a radius of curvature corresponding to the locking ring;
A nuclear turbine thrust bearing fastening structure comprising a locking pin extending downward from the bottom surface of the locking body and disposed at a position corresponding to the ring groove. According to claim 7,
The locking body,
A nuclear turbine thrust bearing fastening structure, characterized in that a groove for inserting a tool is formed that penetrates the outer and inner surfaces and allows an external tool to be inserted. According to claim 1,
A screw thread is formed on the inner circumferential surface of the upper part of the hydraulic oil moving line,
The nuclear turbine thrust bearing fastening structure, characterized in that the hydraulic oil supply coupler having a thread formed on the outer peripheral surface is screwed to the hydraulic oil moving line.

Images