JP2005098167A - Support casing removal jig and its removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support casing removing jig capable of removing a support casing alone without disassembling the entire engine while keeping a rotor shaft connecting a turbine and a compressor in a use position, and a method for removing the support casing.
A guide jig attaching step (A) for connecting a bearing guide member 12 to a rotor shaft and attaching a load supporting member to a rear end of the guide while maintaining a rotor shaft 1 connecting a turbine and a compressor horizontally. The support casing 3 is separated horizontally from the turbine casing 4 and a lifting member mounting step (B) for mounting the casing lifting member using the flange hole, and then the turbine is shifted backward while the support casing 3 is lifted. A load changing step (C) in which the blade is exposed and the downward force acting on the rotor shaft 1 is supported by supporting the turbine blade from below, thereby eliminating the need for support by the load support member at the rear end of the guide; And a casing removing step (D) for removing the support casing 3 from the bearing guide member.
[Selection] Figure 3

Description

  The present invention relates to a support casing removal jig for removing a rear turbine bearing support casing constituting a turbine section of a jet engine alone and a method for removing the support casing.

FIG. 4 is an overall configuration diagram of a general jet engine. In this jet engine, a compressor, a combustor, and a turbine are coaxially connected, fuel is combusted in the combustor using air compressed by the compressor, and the turbine is rotationally driven by the generated combustion gas. Force is transmitted to the compressor through the rotor shaft, and the compressor is driven to rotate.
In this example, the rotor shaft 1 is supported by four bearings 2a, 2b, 2c, and 2d so as to be rotatable at high speed. In this example, the rotor shaft 1 is composed of a front rotor shaft and a rear rotor shaft that are intermediately connected by a spline joint. However, there may be one as a whole.

Non-patent document 1 is disclosed as a technique related to the present invention.
The “casing mounting jig” of Non-Patent Document 1 prevents corrosion due to intrusion of rainwater by attaching and removing a casing presser using a jig when stopping an outer casing surrounding a boiler for a thermal power plant. Is.

Published technical report, public technical number 92-23216, issue date: 1992.9.916

  In the above-described jet engine, the turbine portion is exposed to high-temperature gas, so that cracks due to thermal stress or the like may occur in the rearmost casing. In this case, in order to repair the crack portion by welding or the like, it is necessary to disassemble and remove the rearmost casing 3. Hereinafter, this casing is referred to as “rear turbine bearing support casing” or simply “support casing”.

The casing 3 (support casing) incorporates the last bearing 2d of the above-mentioned four bearings 2a, 2b, 2c, 2d. Then, after dividing into a combustor part and a turbine part, and further disassembling the turbine part vertically, the last casing 3 was removed.
However, even though the casing repair itself is completed in a short time (for example, one day), the entire engine is disassembled until the support casing is in a single state. There was a problem.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a support casing detachment jig and a detachable support casing that can be detached as a single unit without disassembling the entire engine while keeping the rotor shaft that connects the turbine and the compressor in use. It is to provide a method.

According to the present invention, with the support casing removal jig for removing the support casing containing the bearing supporting the rear end of the rotor shaft backward together with the bearing, while maintaining the rotor shaft connecting the turbine and the compressor horizontally. There,
A bearing guide member for moving the support casing rearward while transmitting a downward force acting on the rotor shaft connected to the rotor shaft to the load support member at the rear end;
A casing lifting member for lifting the support casing horizontally and moving the support casing backward while minimizing rubbing of the guide and bearing roller;
Turbine blade support that supports the turbine blade from below and replaces the downward force acting on the rotor shaft, eliminates the downward force acting on the rear end of the guide, and makes it possible to remove the hoist that prevents the support casing from being pulled out And a support casing removing jig.

According to the configuration of the present invention, by connecting the bearing guide member to the rotor shaft, the downward force acting on the rotor shaft is transmitted to the load supporting member (hoist, jack, spacer, etc.) at the rear end portion, thereby supporting casing. Can be moved backwards.
Further, the casing lifting member can lift the support casing horizontally and move the support casing backward while minimizing the rubbing of the guide and the bearing roller. Therefore, the bearing guide member and casing lifting member are used in combination to transmit the downward force acting on the rotor shaft to the load support member at the rear end, and support from the turbine casing while minimizing the rubbing of the guide and bearing roller. The casing can be separated horizontally back.
Furthermore, the turbine blade support member supports the turbine blade from below and replaces the downward force acting on the rotor shaft, eliminates the downward force acting on the rear end of the guide, and prevents the support casing from being pulled out. Can be removed.

According to a preferred embodiment of the present invention, the bearing is a roller bearing slidable in the axial direction on the outer peripheral surface of the inner ring,
The bearing guide member is provided at a front end portion, and is fixed to a screw portion for fixing nuts of the bearing. The bearing guide member has a maximum outer diameter equal to the outer diameter of the inner ring and extends rearward from the front end portion by a predetermined length. A horizontal guide portion and a guide lifting member provided at the rear end portion for lifting the rear end portion and preventing the suspension from hanging down;
The turbine blade support member includes a fixing portion that is detachably attached to a rear flange of the turbine casing to which a front portion of the support casing is fixed, and a support portion that supports a tip portion of the turbine blade from below.

With this configuration, the bearing roller in the support casing can be supported by the horizontal guide portion and smoothly slid rearward by screwing the fixing screw portion of the bearing guide member with the fixing nut screw portion of the bearing. .
Also, the fixed part of the turbine blade support member is attached to the rear flange of the turbine casing, and the tip of the turbine blade is supported from below by the support part, so that the downward force acting on the rotor shaft is replaced, and the support casing is pulled out. The need for a hoist at the rear end of the guide can be eliminated.

Further, according to the present invention, with the rotor shaft connecting the turbine and the compressor being held horizontally,
A guide jig attaching step of connecting a bearing guide member to the rotor shaft and attaching a load supporting member to the rear end of the guide;
A lifting member attaching step of separating the support casing from the turbine casing horizontally rearward and attaching a casing lifting member to the support casing;
Next, the support casing is lifted and shifted backward to expose the turbine blades, support the turbine blades from below, and replace the downward force acting on the rotor shaft, thereby requiring support by the load support member at the rear end of the guide Load transfer step to eliminate the property,
There is provided a method of removing a support casing, comprising: a casing removing step of removing the support casing from the bearing guide member.

According to the method of the present invention, in the lifting member attaching step, the support casing can be separated horizontally from the turbine casing, and the casing lifting member can be attached using the flange hole.
Further, in the load changing step, the support casing is lifted and shifted backward to expose the turbine blades, and the turbine blades are supported from below and the downward force acting on the rotor shaft is replaced. The need for support by a support member (such as a hoist) can be eliminated. Accordingly, in the casing removing step, the entire support casing can be completely removed from the bearing guide member.

According to a preferred embodiment of the present invention, the bearing is a roller bearing slidable in the axial direction on the outer peripheral surface of the inner ring,
The bearing guide member is provided at a front end portion, and is fixed to a screw portion for fixing nuts of the bearing. The bearing guide member has a maximum outer diameter equal to the outer diameter of the inner ring and extends rearward from the front end portion by a predetermined length. A horizontal guide portion and a guide lifting member provided at the rear end portion for lifting the rear end portion and preventing the suspension from hanging down;
In the casing removing step, the support casing is lifted horizontally by using the casing lifting member, and the support casing is moved rearward with minimal rubbing between the bearing roller and the bearing guide member.

By this method, the fixing screw portion of the bearing guide member is screwed with the screw portion for the fixing nut of the bearing, thereby supporting the bearing roller in the support casing by the horizontal guide portion and acting downward on the rotor shaft rear end portion. The force can be smoothly slid backward while transmitting the force to the support casing.
Therefore, in the casing removal step, the support casing is lifted horizontally by using the casing lifting member, and the support casing is moved backward with minimal rubbing between the roller of the bearing and the bearing guide member. It can be smoothly separated horizontally back.

  In the turbine blade support step, a turbine blade support member is attached to the rear flange of the turbine casing so as to support the tip of the turbine blade from below.

  By this method, the downward force acting on the rotor shaft rear end can be supported by the rear flange via the turbine blade, and the downward force acting on the rotor shaft can be replaced to remove the hoist that prevents the support casing from being pulled out. Can be.

The above-described support casing removing jig and the method for removing the same according to the present invention have the following effects.
(1) The support casing can be smoothly removed by assembling the bearing guide member to the rotor shaft and sliding the support casing from the rotor shaft onto the bearing guide member.
(2) Since the support casing can be made completely horizontal by adjusting the support position of the casing lifting member corresponding to the center of gravity of the support casing, it can be extracted without damaging the bearing and the rotor shaft. .
(3) The support casing can be removed alone without disassembling the entire engine while maintaining the rotor shaft connecting the turbine and the compressor in the use position. Therefore, the repair period of the support casing can be greatly shortened (for example, from one week or more to one day).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an enlarged view of a turbine section that is a subject of the present invention. This turbine portion is directly connected to a combustor portion (not shown) at a front flange. The turbine section includes a front turbine casing 4 and a rear support casing 3, and is connected to each other by bolts or the like via flanges 4a and 3a. The turbine casing 4 includes a bearing 2c, and the support casing 3 includes a bearing 2d. The rotor shaft 1 is supported by bearings 2c and 2d and extends to a combustor part and a compressor part (not shown).

In this example, the bearing 2d that supports the rear end portion of the rotor shaft 1 rotatably supports the turbine rotor 5 of the turbine blade at the rearmost end. The bearing 2d is a roller bearing that includes an inner ring, an outer ring, and a plurality of rollers positioned therebetween, and is slidable in the axial direction on the outer peripheral surface of the inner ring.
The rear end portion of the turbine rotor 5 is provided with a screw portion for a fixing nut of the bearing, and the inner ring of the bearing 2d is fixed so as not to move in the axial direction by a fixing nut 6 screwed with the screw portion. Yes.
An exhaust cone 7 is provided further rearward than the rear end portion of the rotor shaft 1. In addition, a sump unit (not shown) or the like is built in the exhaust cone 7.

  FIG. 2 is a view showing a use state of the removal jig according to the present invention. The removal jig 10 of the present invention includes a bearing guide member 12, a casing lifting member 14, and a turbine blade support member 16.

  The bearing guide member 12 has a fixed screw portion 12a which is provided at the front end portion and engages with a screw portion for a fixing nut of the bearing, has a maximum outer diameter equal to the outer diameter of the inner ring, and has a predetermined length rearward from the front end portion. It has a horizontal guide portion 12b that extends, and a guide lifting member 12c that is provided at the rear end portion and lifts the rear end portion to prevent it from drooping. The predetermined length is a length at which the mounting portion of the load supporting member (the rear end hoist mounting portion in this example) protrudes rearward from the support casing, and is, for example, about 80 cm.

  With this configuration, the bearing guide member 12 is coupled to the fixing nut screw portion of the rotor shaft 1 and the sliding between the bearing rotor and the horizontal guide portion 12b is supported with the downward force acting on the rotor shaft 1 supported at the rear end. Thus, the support casing 3 has a function of moving backward.

  The casing lifting member 14 has a function of lifting the support casing 3 horizontally and moving the support casing 3 rearward while minimizing rubbing between the roller and the guide. The casing lifting member 14 can adjust the support position of the lifting bracket 14a corresponding to the center of gravity of the support casing 3, so that the support casing 3 can be accurately lifted horizontally. .

The turbine blade support member 16 includes a fixing portion 16a that is detachably attached to the rear flange 4a of the turbine casing 4 to which the front portion of the support casing 3 is fixed by a bolt or the like, and a support portion that supports the tip portion of the turbine blade from below. 16b. The fixing portion 16a has the same shape as the lower end portion of the front flange 3a of the support casing 3, and can be fixed to the rear flange 4a with a bolt or the like. The support portion 16b is formed integrally with the fixed portion 16a, and preferably has an arc surface that is in close contact with the tip portions of the plurality of turbine blades.
With this configuration, the turbine blade support member 16 has a function of supporting the turbine blade from below and replacing a downward force acting on the rotor shaft 1 to eliminate the need for a guide rear end hoist that hinders extraction.

By connecting the bearing guide member 12 to the rotor shaft 1 with the above-described configuration, the support casing 3 is moved rearward while transmitting the downward force acting on the rotor shaft 1 to the load support member (hoist) at the rear end. can do. Further, the casing lifting member 14 can lift the support casing 3 horizontally and move the support casing backward while minimizing the rubbing of the guide and the bearing roller.
Therefore, the turbine casing 4 is configured such that the bearing guide member 12 and the casing lifting member 14 are used in combination to transmit the downward force acting on the rotor shaft 1 to the hoist at the rear end portion and minimize the rubbing of the guide and the bearing roller. The support casing 3 can be separated horizontally from the rear.
Further, the turbine blade support member 16 supports the turbine blade from below and replaces the downward force acting on the rotor shaft 1, eliminates the downward force acting on the guide rear end, and prevents the support casing from being pulled out. Can be removed.

  FIG. 3 is a diagram showing a removal method according to the present invention. As shown in this figure, in the removal method of the present invention, the guide shaft mounting step (A), the lifting member mounting step (B), with the rotor shaft 1 connecting the turbine and the compressor being held horizontally, The load replacement step (C) and the casing removal step (D) are performed in this order.

Before the guide jig attaching step (A), the exhaust cone 7 and the fixing nut 6 are removed in advance.
Next, in the guide jig attaching step (A), the bearing guide member 12 described above is connected to the rotor shaft 1, a hoist is attached to the rear end of the guide, and the support casing 3 is lifted horizontally by the casing lifting member 14.
When the bearing guide member 12 is connected, the guide lifting member 12c provided at the rear end of the bearing guide member 12 may be hung with a hoist at the rearmost portion of the guide so that the rotor shaft 1 does not hang downward.
Also, the flange bolts and nuts connecting the support casing 3 and the turbine casing 4 are removed.

In the lifting member attaching step (B), the support casing 3 is separated horizontally from the turbine casing 4 and the casing lifting member 14 is attached using a flange hole.
That is, the support casing 3 is lifted horizontally by using the casing lifting member 14, the connection between the support casing 3 and the turbine casing 4 is disconnected, and the support casing 3 is supported by the bearing guide member 12 to have a predetermined length (about 80 cm). ) Slide backwards only. By this backward sliding, a gap corresponding to a predetermined length is formed between the turbine casing 4 and the support casing 3.

  In the load transfer step (C), the turbine blades are exposed by shifting backward while floating the support casing, and a turbine blade support member 16 is attached to the rear flange of the turbine casing 4 from this gap, and is attached to the turbine disk 5 at the end. The attached turbine blades (turbine four-stage blades) are supported from below and the downward force acting on the rotor shaft 1 is replaced, thereby eliminating the need for support by a hoist at the rear end of the guide.

In the casing removing step (D), the hoist is replaced with the casing lifting member 14, the support casing 3 is suspended by the casing lifting member 14, and the support casing 3 is slid rearward to remove the support casing 3 from the bearing guide member 12. Removal is complete.
After the support casing 3 is removed, the crack portion may be repaired by welding or the like, or may be reassembled using a new one. The reassembly after removal can be performed in the reverse order of the removal order.

By the above-described method of the present invention, in the lifting member attaching step (B), the downward force acting on the rotor shaft 1 is supported by the casing lifting member 14 via the bearing guide member 12 and the support casing 3, and the turbine casing. The support casing 3 can be separated horizontally from 4 and the casing lifting member can be attached using a flange hole.
Further, in the load changing step (C), the support casing is lifted and shifted rearward to expose the turbine blades, and the turbine blades are supported from below and the downward force acting on the rotor shaft 1 is replaced. The need for support by a hoist at the end can be eliminated. Accordingly, the entire support casing can be completely removed from the bearing guide member 12 in the casing removing step (D).

  As described above, according to the present invention, the support casing can be removed alone without disassembling the entire engine while the rotor shaft connecting the turbine and the compressor is held in the use position.

It is an enlarged view of the turbine part made into the object of the present invention. It is a figure which shows the use condition of the removal jig | tool by this invention. It is a figure which shows the removal method by this invention. 1 is an overall configuration diagram of a general jet engine.

Explanation of symbols

1 rotor shaft, 2a, 2b, 2c, 2d bearing,
3 Support casing (rear turbine bearing support casing),
3a flange, 4 turbine casing, 4a flange,
5 turbine rotor, 6 fixing nut, 7 exhaust cone,
10 removal jig, 12 bearing guide member,
12a fixing screw part, 12b horizontal guide part, 12c guide lifting member,
14 casing lifting member, 14a lifting bracket,
16 Turbine blade support member, 16a fixed part, 16b support part

Claims (5)

A support casing removal jig for removing a support casing with a built-in bearing supporting the rear end of the rotor shaft together with the bearing while holding the rotor shaft connecting the turbine and the compressor horizontally,
A bearing guide member for moving the support casing rearward while transmitting a downward force acting on the rotor shaft connected to the rotor shaft to the load support member at the rear end;
A casing lifting member for lifting the support casing horizontally and moving the support casing backward while minimizing rubbing of the guide and bearing roller;
Turbine blade support that supports the turbine blade from below and replaces the downward force acting on the rotor shaft, eliminates the downward force acting on the rear end of the guide, and makes it possible to remove the hoist that prevents the support casing from being pulled out And a support casing removal jig. The bearing is a roller bearing that is slidable in the axial direction on the outer peripheral surface of the inner ring,
The bearing guide member is provided at a front end portion, and is fixed to a screw portion for fixing nuts of the bearing. The bearing guide member has a maximum outer diameter equal to the outer diameter of the inner ring and extends rearward from the front end portion by a predetermined length. A horizontal guide portion and a guide lifting member provided at the rear end portion for lifting the rear end portion and preventing the suspension from hanging down;
The turbine blade support member has a fixing portion that is detachably attached to a rear flange of the turbine casing to which a front portion of the support casing is fixed, and a support portion that supports the tip portion of the turbine blade from below. The support casing removal jig according to claim 1. With the rotor shaft connecting the turbine and compressor held horizontally,
A guide jig attaching step of connecting a bearing guide member to the rotor shaft and attaching a load supporting member to the rear end of the guide;
A lifting member attaching step of separating the support casing from the turbine casing horizontally rearward and attaching a casing lifting member to the support casing;
Next, the support casing is lifted and shifted backward to expose the turbine blades, support the turbine blades from below, and replace the downward force acting on the rotor shaft, thereby requiring support by the load support member at the rear end of the guide Load transfer step to eliminate the property,
And a casing removing step for removing the support casing from the bearing guide member. The bearing is a roller bearing that is slidable in the axial direction on the outer peripheral surface of the inner ring,
The bearing guide member is provided at a front end portion, and is fixed to a screw portion for fixing nuts of the bearing. The bearing guide member has a maximum outer diameter equal to the outer diameter of the inner ring and extends rearward from the front end portion by a predetermined length. A horizontal guide portion and a guide lifting member provided at the rear end portion for lifting the rear end portion and preventing the suspension from hanging down;
The step of removing the casing includes lifting the support casing horizontally using a casing lifting member, and moving the support casing rearward with minimal rubbing between the bearing roller and the bearing guide member. 4. A method for removing the support casing according to 3. The method of removing a support casing according to claim 3, wherein, in the turbine blade support step, a turbine blade support member is attached to a rear flange of the turbine casing so as to support a tip portion of the turbine blade from below.

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