KR101466023B1 - A rotor for easy replacement of a sealing device at a reactor cooling pump and method for replacing a sealing device at a reactor cooling pump - Google Patents

Abstract

The present invention relates to a rotary shaft for easily replacing a shaft seal device of a nuclear reactor coolant pump. More particularly, the present invention relates to a rotary shaft of a nuclear reactor coolant pump in which a rotary shaft of a reactor coolant pump is connected to a first rotary shaft and a second rotary shaft by a shaft connecting member, A rotary shaft for replacing the shaft sealing device of the reactor coolant pump that facilitates the rotary shaft replacement operation by allowing the shaft sealing device to be simply withdrawn after the shaft connecting member is removed without lifting the bearing assembly and a new shaft sealing device can be inserted and replaced .
Accordingly, the present invention provides a nuclear reactor coolant pump comprising: a first rotation shaft installed in a reactor coolant pump and connected to a motor unit; a second rotation shaft connected to a pump for supplying cooling water; And a shaft connecting member detachably installed between the first rotating shaft and the second rotating shaft to transmit the torque of the first rotating shaft to the second rotating shaft.

Description

Technical Field [0001] The present invention relates to a rotary shaft and a reactor coolant pump, and more particularly, to a rotary shaft and a reactor coolant pump which are easy to replace a shaft seal device of a reactor coolant pump. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a rotary shaft for easily replacing a shaft seal device of a reactor coolant pump, and more particularly, to a rotary shaft of a nuclear reactor coolant pump which is separated from a rotary shaft of a nuclear reactor coolant pump and removes a shaft connecting member without lifting the rotary shaft and axial thrust bearing assemblies The present invention relates to a rotary shaft for replacing a shaft sealing device of a nuclear reactor coolant pump that facilitates a rotating shaft replacement operation by allowing a new shaft sealing device to be pulled out after being simply pulled out of a rear shaft sealing device.

Generally, nuclear power is the principle of heating the water with the energy generated from the reactor and using the generated steam to start the turbine generator. To this end, a nuclear power plant is composed of a reactor that generates a large amount of energy, a pump that supplies water, a steam generator that converts the water into steam, and a pressurizer that controls the pressure and volume of the reactor coolant system. The reactor coolant system is provided with a reactor coolant pump for circulating the coolant.

The reactor coolant pump includes a pumping unit for pumping the coolant and circulating the coolant while being operated by the motor unit. (Hereinafter, referred to as a motor shaft) and a shaft of a pumping unit (hereinafter referred to as a pump shaft) are connected by a coupling and are allowed to rotate at the same time.

The pumping unit is typically comprised of a vertical centrifugal pump having an impeller at the bottom to allow large amounts of reactor coolant to travel at high temperatures and pressures, for example, 287.5 ° C (550 F) and 15.525 MPa (2250 psi) have.

1, the reactor coolant pump (RCP) 1 generally comprises a motor part 10 as a drive source on the upper side and a pump part 20 on the lower side thereof. The motor shaft 11, The pump shafts 21 and 22 are connected to each other through a coupling 12.

Normally, when the coolant pump sealing device is serviced, the pump shaft should be mounted on the back sheet and moved about 1 inch up and down for coupling connection after maintenance.

In this case, although a hydraulic jack has been used in the related art, there is a problem that the pump shafts 21 and 22 are impacted on the back sheet due to a sudden pressure decrease when the hydraulic pressure is released, and now the coupling bolt is loosened, .

In order to couple the two shafts, the two pump shafts and two hydraulic jacks are used to lift the pump shafts (21, 22). However, due to unstable installation of the hydraulic jacks and unbalance of the hydraulic jacks There is concern about damage of pump radial bearing, and the shaft is lifted while slightly tightening the coupling bolt to the left and right.

In particular, the axis of such a conventional reactor coolant pump is integrally formed from the motor coupling to the impeller.

Although there is a difference in durability, the rotary shaft sealing device must be replaced once every three to four years, and the rotary shaft and the axial thrust bearing aggregate must be lifted and replaced each time the rotary shaft sealing device is replaced. Therefore, The need for large lifting equipment and manpower required the replacement of the shaft sealing device very inconvenient and time consuming.
Prior Art Document: Published Utility Model Publication No. 20-2000-0013334
United States Patent No. 2839006

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a nuclear reactor coolant pump with a rotary shaft of a separable type, So as to facilitate the rotation shaft replacement work.

In order to achieve the above-mentioned object, the present invention will be realized by an embodiment having the following constitution as a preferred embodiment. The present invention provides the following technical constructions to solve the above problems.

According to an embodiment of the present invention, there is provided a nuclear reactor coolant pump comprising: a first rotation shaft installed in a reactor coolant pump and connected to a motor unit; a second rotation shaft connected to a pump for supplying a coolant; And a shaft connecting member detachably connected between the first rotating shaft and the second rotating shaft to transmit the torque of the first rotating shaft to the second rotating shaft, .

Further, it may further comprise fastening means for connecting the shaft connecting member between the first rotating shaft and the second rotating shaft.

The fastening means may include fastening bolts connecting the shaft connecting member to the first rotating shaft and fastening bolts connecting to the second rotating shaft.

According to another embodiment of the present invention, the shaft connecting member includes: a first fastener formed at one end and connected to the first rotating shaft; And a second fastener formed at the other end and connected to the second rotation shaft; Or the like.

The first rotating shaft includes a first rotating shaft flange formed at one end thereof and connected to the first rotating shaft, and the second rotating shaft includes a second rotating shaft flange formed at one end thereof and connected to the second rotating shaft.

In addition, the shaft connecting member may be formed in a cylindrical shape.

According to another aspect of the present invention, there is provided a method of replacing a shaft sealing device in a rotating shaft of a nuclear reactor coolant pump, the method comprising: separating a shaft connecting member connected between the first rotating shaft and the second rotating shaft; Withdrawing the shaft connecting member outward; Withdrawing the shaft sealing device through the space in which the shaft connecting member is drawn out; Introducing the shaft sealing device to be replaced and inserting the shaft connecting member between the first rotating shaft and the second rotating shaft; And connecting a shaft connecting member between the first rotating shaft and the second rotating shaft. The present invention also provides a method of replacing a shaft sealing device in a rotating shaft of a nuclear reactor coolant pump.

In the step of separating the shaft connecting member, the connecting means may be released from the shaft connecting member connected by the connecting means between the first rotating shaft and the second rotating shaft.

In the step of connecting the shaft connecting member, the shaft connecting member may be coupled by the fastening means between the first rotating shaft and the second rotating shaft.

INDUSTRIAL APPLICABILITY As described above, the present invention can achieve the following effects according to the above-described problem solving means and the construction and operation to be described later.

Since the rotating shaft of the reactor coolant pump is configured as a separable type, it is possible to replace the rotary shaft sealing device without lifting the rotary shaft and the axial thrust bearing assembly of the large pump, which is difficult to handle at the periodic replacement of the rotary shaft sealing material, , The cost can be reduced, and the economical efficiency can be improved.

The present invention can also minimize the storage space of the rotary shaft and the risk of safety accidents that may occur when lifting a large structure according to a very simple operation.

1 is a perspective view showing a conventional reactor coolant pump.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a reactor coolant pump,
FIG. 3 and FIG. 4 are perspective views illustrating a method of replacing a shaft sealing device in a rotating shaft of a reactor coolant pump according to an embodiment of the present invention. FIG.

Hereinafter, an embodiment of a rotating shaft and a shaft sealing device replacement method for easily replacing the shaft sealing device of the reactor coolant pump according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as being limited to ordinary or dictionary terms, and the inventor should appropriately define the concept of the term to describe its invention in the best way The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, the present invention will be described in detail with reference to FIG. 2 to FIG.

As shown in FIG. 2, the structure of an embodiment of the present invention includes a first rotating shaft 110, a shaft connecting member 300 that is a connecting component between the first rotating shaft and the second rotating shaft, (210).

A collar 130 is attached to the first rotating shaft 110. A gear ring 140 connected to the motor unit is formed at one end of the first rotating shaft 110 and a first rotating shaft flange 120 connected to the shaft connecting member 300 is formed at the other end. The first rotary shaft flange 120 is formed with a receiving groove or a through hole through which a part of the fastening means is received. The first rotating shaft flange 120 is formed to have a diameter larger than the diameter of the first rotating shaft 110. An oil impeller 150 is provided between the collar 130 and the first rotating shaft flange 120.

One end of the second rotary shaft 210 is coupled to the impeller 230. A second rotary shaft flange 220 connected to the shaft connecting member 300 is formed at the other end of the second rotary shaft 210. The second rotary shaft flange 220 is formed with a receiving groove or a through hole through which a part of the fastening means is received. The second rotary shaft flange 220 is formed to have a diameter larger than the diameter of the second rotary shaft 210.

However, the shape of the first and second rotary shaft flanges 120 and 220 is not limited thereto, and may be any shape that can be fastened by the first and second fasteners 320 and 330 and fastening means.

The first rotating shaft 110 and the second rotating shaft 210 are connected to each other by the connecting parts of the first and second rotating shafts 110 and 210 and the shaft connecting member 300 and fastening means, And is transmitted from the rotating shaft 110 to the second rotating shaft 210.

The shaft connecting member 300 includes a cylindrical body 310 extending in the axial direction of the first rotating shaft 110 and the second rotating shaft 210, a first fastening hole 320 formed at one end of the body 310, And a second fastener 330 formed at the other end of the second fastener 310.

The body 310 may be a cylindrical shape having a diameter equal to that of the first rotation shaft 110 or the second rotation shaft 210, and may be a cylindrical tube or an interior. Although not shown, a gear wheel may be further formed on the outer circumferential surface of the body 310 to serve as a speed sensor for measuring the number of revolutions. However, the shape of the body 310 is not limited to this, and may be any shape capable of transmitting the torque of the first rotation shaft 110 to the second rotation shaft 210.

The first and second fasteners 320 and 330 are formed at one end and the other end of the body 310 and are formed into a flange shape extending in the radial direction from the outer peripheral surface of the body 310. At this time, the first and second fasteners 320 and 330 may be formed to have the same diameter as the diameters of the first and second rotating shaft flanges 120 and 220, respectively. The first and second fasteners 320 and 330 are formed with through holes through which fastening means pass. At this time, the through holes are formed to penetrate the first and second fasteners 320 and 330 along the axial direction at a portion formed by extending from the body 310 in the radial direction.

The fastening means includes a fastening bolt 311 fastening the first fastening hole 320 and the first rotary shaft flange 120 and fastening bolts fastening the second fastening hole 330 and the second rotary shaft flange 220 ). The fastening bolt 311 is inserted into the through hole of the first fastening hole 320 and inserted into the receiving groove formed in the first rotary shaft flange 120 or inserted into the through hole and fixed with the nut. A wasted screw can be used as such a fastening bolt. The fastening bolt for fastening the second fastening hole 330 and the second rotary shaft flange 220 is also the same as the fastening bolt 311 described above.

3 and 4, when the rotary shaft sealing device S is replaced, the shaft coupling member 300 is unfastened from the shaft coupling member 300 and the shaft coupling member 300 is rotated through the separate drawing device 400 The rotary shaft sealing device S is taken out from the sealing device case 240 and the replacement operation is performed.

The rotary shaft for easily replacing the shaft sealing device of the reactor coolant pump according to the embodiment of the present invention may be installed in the reactor coolant pump 1 shown in FIG.

Hereinafter, with reference to FIGS. 3 and 4, a method of replacing the shaft sealing apparatus S on the rotating shaft of the reactor coolant pump according to an embodiment of the present invention will be described.

The method of replacing the shaft sealing device in the reactor coolant pump according to the embodiment of the present invention provides a method of replacing the shaft sealing device S at the rotating shaft of the reactor coolant pump without very simply lifting between the rotating shafts.

First, a step of separating the shaft connecting member 300 connected between the first rotating shaft 110 and the second rotating shaft 210 for the replacement operation of the shaft sealing apparatus S is performed. At this time, the fastening bolt which is fastening means for fastening the shaft connecting member 300 to the first rotating shaft 110 and the second rotating shaft 210 is released to separate the shaft connecting member 300.

The first fastener 320 is coupled to the first rotary shaft flange 120 of the first rotary shaft by the fastening bolt 311 while the second fastener 330 is coupled to the second rotary shaft flange 220, As shown in Fig. The engagement of the first and second fasteners 320 and 330 can be easily released by the release operation of the fastening bolt.

Next, the process of advancing the shaft connecting member 300 to the outside is proceeded.

After the shaft connecting member 300 is pulled out, a step of pulling out the shaft sealing apparatus S is performed. At this time, since the shaft sealing device S is inserted into the sealing device case 240, the cover of the sealing device case 240 is peeled off and the shaft sealing device S is taken out.

The new shaft sealing device S to be replaced is drawn in and the shaft connecting member 300 is inserted between the first rotating shaft 110 and the second rotating shaft 210, The operation of replacing the shaft sealing apparatus S is completed while the shaft connecting member 300 is fastened by the fastening means between the rotating shafts.

Here, the operation of drawing the shaft coupling member 300 and the shaft sealing apparatus S out of the spacing space or into the spacing space is implemented through a separate drawing apparatus 400. As shown in FIGS. 3 and 4, it is preferable that the drawing device 400 is formed as a device capable of placing heavy-weight equipment on a shelf and then discharging the sliding equipment to the outside.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. The present invention is not limited to the embodiments and the accompanying drawings, and thus the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes, substitutions, and alterations can be made hereto without departing from the spirit of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are also included in the scope of the present invention.

1: reactor coolant pump 10: motor section
11: Motor shaft 12: Coupling
20: pump section 21, 22: pump shaft
110: first rotating shaft 120: first rotating shaft flange
130: collar 140: gearing
210: second rotating shaft 220: second rotating shaft flange
230: impeller 240: sealing device case
300: shaft connecting member 310: first fastener
311: fastening bolt 320: second fastening hole
350: motor support plate 360: first rotating shaft casing
400: Drawing device S: Axial sealing device

Claims (8)

A first rotating shaft installed in the reactor coolant pump and connected to the motor unit,
A second rotating shaft connected to a pump for supplying the coolant; And
And a shaft connecting member detachably installed between the first rotating shaft and the second rotating shaft and transmitting the torque of the first rotating shaft to the second rotating shaft,
Wherein the shaft connecting member includes a body extending in the axial direction of the first rotating shaft and the second rotating shaft and having the same diameter as the first rotating shaft or the second rotating shaft, And a second fastener formed at the other end of the body and having a diameter larger than a diameter of the second rotation shaft, the second fastener being connected to the second rotation shaft,
And a first rotation axis flange formed at one end of the first rotation shaft and connected to the first engagement hole and having a diameter equal to a diameter of the first engagement hole,
And a second rotating shaft flange having a second rotating shaft formed at one end thereof and connected to the second rotating shaft and having the same diameter as the diameter of the second rotating shaft. One rotation shaft.
The method according to claim 1,
And a fastening means for connecting the shaft connecting member to the first rotating shaft and the second rotating shaft, respectively.
3. The method of claim 2,
Wherein the fastening means comprises a fastening bolt, and the shaft sealing device of the reactor coolant pump is easy to replace.
delete delete A method of replacing a shaft sealing device on a rotating shaft of a reactor coolant pump according to any one of claims 1 to 3,
Separating a shaft connecting member connected between the first rotating shaft and the second rotating shaft;
Withdrawing the shaft connecting member outward;
Withdrawing the shaft sealing device through the space in which the shaft connecting member is drawn out;
Introducing the shaft sealing device to be replaced and inserting the shaft connecting member between the first rotating shaft and the second rotating shaft; And
And connecting a shaft connecting member between the first rotating shaft and the second rotating shaft.
The method according to claim 6,
Wherein the step of separating the shaft connecting member releases the fastening means in the shaft connecting member connected by the fastening means between the first rotating shaft and the second rotating shaft.
The method according to claim 6,
Wherein the step of connecting the shaft connecting member comprises coupling the shaft connecting member with the fastening means between the first rotating shaft and the second rotating shaft.

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