CN110497169B

CN110497169B - Method for decomposing cold end unit body

Info

Publication number: CN110497169B
Application number: CN201910698322.0A
Authority: CN
Inventors: 秦健; 瞿品祥; 张静; 董云龙; 孔勇
Original assignee: AECC South Industry Co Ltd
Current assignee: AECC South Industry Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-12-01
Anticipated expiration: 2039-07-31
Also published as: CN110497169A

Abstract

The invention discloses a method for decomposing a cold end unit body. According to the method for decomposing the cold end unit body, the No. 3 bearing retainer is supported through the assembling support and the assembling base in sequence, the No. 3 bearing can be ensured to keep centering in the decomposing process, the process shaft provided with the No. 4 bearing inner ring is used for replacing the turbine connecting shaft after the turbine connecting shaft is separated, the No. 4 bearing can be ensured to keep centering, then the casing component, the compressor rotor component and the particle separator component in the diffuser are separated in sequence, and finally the No. 3 bearing retainer on the assembling base is taken down. According to the method for decomposing the cold end unit body, the No. 3 bearing and the No. 4 bearing are always guaranteed to keep the centering effect in the whole decomposing process, the problems of rotor clamping stagnation, rotor and stator axial collision and grinding and the falling of the No. 3 bearing retainer are avoided in the decomposing process, the reliability, the stability and the safety of the decomposing process are improved, and the scientific research and production progress is guaranteed.

Description

Method for decomposing cold end unit body

Technical Field

The invention relates to the technical field of engine decomposition, in particular to a method for decomposing a cold-end unit body.

Background

The cold end unit body of the turboshaft engine consists of a particle separator component, a compressor casing component, a diffuser middle casing component and a compressor rotor component. The particle separator component and the compressor casing component, the compressor casing component and the upper impeller outer cover of the compressor rotor, the impeller outer cover and the middle casing component of the diffuser are positioned through precise rabbets and are connected through bolts to form bearing fulcrums No. 3 and No. 4 of the compressor rotor. Although the connection mode of the precise spigot positioning increases the installation precision of the No. 3 and No. 4 pivots of the compressor rotor, the disassembly difficulty caused by factors such as spigot deformation and the like after the engine test run is also improved, and the risk of axial collision and grinding of the rotor and the stator is increased. Meanwhile, the clearance fit precision of the rotor and stator tips and the rotor labyrinth of the turboshaft engine is high, the minimum (single-side) radial clearance between the rotor labyrinth and the stator is only 0.025, and the problem of rotor clamping stagnation is easily caused by slightly large change of the coaxiality of the rotor and the stator in the decomposition process.

In 2015-2019 years, the problems of axial collision and abrasion and clamping stagnation of rotors and stators occur in the process of decomposing a cold end unit body of a plurality of engines. After decomposition, the root of the exhaust edge of a compressor rotor and the tip of the stator air inlet edge are checked to have roots and curls in different degrees, the coating of a flow passage of a compressor casing has axial collision and grinding traces, the copper-silver-zinc metal sealing coating of an oil slide cavity A of a particle separator assembly and an oil slide cavity B of a casing assembly in a diffuser has obvious indentations, and the repair and replacement work of subsequent fault parts not only directly brings about the economic loss of millions of elements to a company, but also seriously affects the production and delivery progress of an engine.

Disclosure of Invention

The invention provides a method for decomposing a cold-end unit body, which aims to solve the technical problems of rotor clamping stagnation and rotor and stator axial collision and abrasion in the conventional process of decomposing the cold-end unit body.

According to one aspect of the present invention, there is provided a cold end unit body decomposition method, comprising the steps of:

step S1: shaking the assembly vehicle to transversely arrange the cold end unit bodies, and separating parts on a first-stage disc of a compressor rotor assembly until a front inner semi-ring of a No. 3 bearing is separated;

step S2: assembling the assembling bracket on a primary disc shaft neck of a compressor rotor assembly to support a No. 3 bearing retainer;

step S3: shaking the assembly vehicle to enable the cold end unit body to be in a vertical state, installing an assembly base and enabling the assembly base to be matched with the assembly support in place;

step S4: a turbine connecting shaft is divided, and a process shaft provided with a No. 4 bearing inner ring is arranged to replace the turbine connecting shaft;

step S5: dividing a casing component in the diffuser;

step S6: sequentially dividing a compressor casing assembly, a compressor rotor assembly and a particle separator assembly;

step S7: and taking down the No. 3 bearing retainer on the assembly base.

Further, the step S5 is specifically:

the conical surface at the seam allowance of the impeller outer cover is tied by the pair of half hoops, the hoop ring is formed after the pair of half hoops are tied tightly, a plurality of support lugs are evenly arranged on the hoop ring, and the jackscrews are respectively screwed at the support lugs until the rear end face of the jackscrew is attached to ribs of a casing component in the diffuser and then separated from the casing in the diffuser and the impeller outer cover.

Further, the method for decomposing the cold end unit body further comprises the following steps before the step S5:

and rotating the first-stage adjusting ring and the second-stage adjusting ring of the compressor anticlockwise.

Further, the assembling base in the step S3 includes a support, a first bushing, a base, a first guide sleeve, a guide post, a spring, a second guide sleeve, a baffle, and a third bushing, the base is disposed on the assembling vehicle, the first bushing is fixedly sleeved on the support and fixedly connected to the base, the guide post is located above the support, a lower end of the guide post extends into the opening at the upper end of the support and can axially move in the opening, the first guide sleeve is sleeved on the guide post and is in clearance fit with the guide post, the baffle is sleeved on the guide post and is attached to an upper surface of an upper end boss of the guide post, the second guide sleeve is fixedly sleeved on the baffle, the third bushing is located above the baffle and is fixedly connected to the baffle, the third bushing is used for being matched to an assembling bracket, the spring is sleeved on the guide post, the first end of the spring abuts against the lower surface of the upper end boss of the guide pillar, the second end of the spring abuts against the upper surface of the support, after the assembling support and the third bushing are matched in place, the assembling support provides a downward force for the third bushing to push the third bushing, the guide pillar, the second guide sleeve and the baffle to integrally move downwards, and the spring is compressed; after the assembling support is separated along with the compressor rotor assembly, the spring recovers deformation to drive the third bushing, the guide pillar, the second guide sleeve and the baffle to integrally move upwards, and the second guide sleeve plays a role in fixing the No. 3 bearing retainer.

Further, the assembly base further comprises a rubber pad fixedly arranged on the upper surface of the base and used for preventing the lower end of the cold end unit body from being gouged with the base.

Furthermore, the assembly base further comprises a cylindrical pin which is used for axially limiting the first guide sleeve and limiting the whole second guide sleeve, the baffle, the third bushing and the guide pillar to move downwards for the maximum distance.

Further, first bush cover is established on the support and both through first bolt fixed connection, first bush through the screw of equipartition with base fixed connection.

Further, the assembly base further comprises a second bolt and a second bushing, the base is fixed on the assembly vehicle through a plurality of second bolts which are uniformly distributed, and the second bushing is sleeved on the second bolt and used for fixing the second bolt in the bolt hole of the base.

Further, the inner wall of the third bushing is a conical surface.

Further, the assembling bracket in step S2 has a runway bearing surface with the same radius as the front inner half ring of the bearing No. 3, the assembling bracket is mounted on the journal of the primary blade disc of the compressor through the internal thread, and after the front inner half ring of the bearing No. 3 is separated, the assembling bracket replaces the front inner half ring of the bearing No. 3 to play a role of supporting the retainer.

The invention has the following beneficial effects:

the invention relates to a method for decomposing a cold end unit body, which comprises the steps of firstly transversely arranging the cold end unit body, radially positioning the cold end unit body without depending on No. 3 and No. 4 bearings, smoothly separating parts on a first-stage disc of a compressor rotor assembly until the front inner half ring of the No. 3 bearing is separated, then installing an assembling bracket to replace the front inner half ring of the No. 3 bearing to support the No. 3 bearing retainer, ensuring that the No. 3 bearing still can play a centering role in the subsequent decomposition process, then installing an assembling base after the cold end unit body is placed in a vertical state, and matching the assembling base and the assembling bracket in place, thereby ensuring that the assembling base can replace the assembling bracket when the subsequent assembling bracket is separated along with the compressor rotor assembly, ensuring that the No. 3 bearing retainer does not fall in a suspended state, and the No. 3 bearing still can play a centering role, and then, after the turbine connecting shaft is separated, the process shaft provided with the No. 4 bearing inner ring is used for replacing the turbine connecting shaft, so that the No. 4 bearing can keep a centering effect, then the casing component, the compressor rotor component and the particle separator component in the lower diffuser are sequentially separated, and finally the No. 3 bearing retainer on the assembling base is taken down. According to the method for decomposing the cold end unit body, the No. 3 bearing and the No. 4 bearing are always guaranteed to keep the centering effect in the whole decomposing process, the problems of rotor clamping stagnation, rotor and stator axial collision and grinding and the falling of the No. 3 bearing retainer are avoided in the decomposing process, the reliability, the stability and the safety of the decomposing process are improved, and the scientific research and production progress is guaranteed.

In addition, a pair of half hoops is adopted to tighten the conical surface at the seam allowance position of the impeller outer cover in the process of separating the casing component in the compressor, then a plurality of jackscrews are evenly screwed in, the applied jacking force is even, the casing in the impeller outer cover and the casing in the diffuser cannot be damaged in the process of decomposing the casing and the impeller outer cover, and the assembling bracket is adopted to replace the half rings in the No. 3 bearing in the step S2, when the casing component in the diffuser is separated, the retainer and the balls of the No. 3 bearing cannot fall off, the rotor blade cannot be lifted together with the casing component in the diffuser, and therefore the problems of rotor clamping stagnation and rotor stator axial collision and abrasion cannot be caused.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic flow diagram of a cold end unit block decomposition method in accordance with a preferred embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the assembly base in step S3 in fig. 1 according to the preferred embodiment of the present invention.

Fig. 3 is a schematic structural view of a pair of half-bands adopted for lowering a cartridge assembly of the gas compressor in step S5 in fig. 1 according to a preferred embodiment of the present invention.

Description of the reference numerals

1. A first latch; 2. a support; 3. a first bushing; 4. a second bolt; 5. a second bushing; 6. a base; 7. a first guide sleeve; 8. a cylindrical pin; 9. a guide post; 10. a spring; 11. a second guide sleeve; 12. a baffle plate; 13. a third bushing; 14. a screw; 15. a rubber pad; 21. half clamping hoop; 211. and (6) supporting the ear.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

When the engine is decomposed, the engine is required to be arranged on an assembly vehicle, the cold end unit body is obtained after the power turbine unit body, the accessory transmission unit body and the hot end unit body are decomposed, and a compressor rotor assembly in the cold end unit body comprises parts such as a 1-5-level axial flow type integral blade disc, a centrifugal impeller, a central pull rod, a turbine connecting shaft, a long bolt, a No. 3 bearing, a No. 4 bearing and the like, wherein the No. 3 bearing is a double-inner-half-ring angular contact ball bearing, a front inner half ring and a rear inner half ring of the bearing are assembled on a front journal of the compressor first-level blade disc, a supporting point of the bearing is positioned in an A lubricating cavity of a particle separator assembly, the No. 4 bearing is a rolling rod bearing, an inner half ring of the bearing is assembled on a journal of the turbine connecting shaft. The cold end unit body obtained after decomposition is in a vertical state, the compressor rotor assembly needs to be radially positioned by means of No. 3 and No. 4 bearings, and due to the structure of the engine, the front half ring of the No. 3 bearing inner ring and the turbine shaft connecting shaft need to be separated before the diffuser middle case assembly of the cold end unit body is decomposed, and then the diffuser middle case assembly, the compressor rotor assembly and the particle separator assembly can be sequentially pulled out.

As shown in fig. 1, a preferred embodiment of the present invention provides a method for disassembling a cold end unit body, comprising the steps of:

step S4: a turbine connecting shaft is arranged, and a process shaft provided with a No. 4 bearing inner ring is installed to replace the turbine connecting shaft;

step S5: dividing a casing component in the diffuser;

step S7: and taking down the No. 3 bearing retainer on the assembly base.

It can be understood that, after the power turbine unit body, the accessory transmission unit body and the hot end unit body are disassembled by the engine, in the step S1, the cold end unit body obtained after the engine is disassembled by shaking the assembling vehicle is transversely arranged, at this time, the cold end unit body does not need to be radially positioned by the bearings 3 and 4, parts on the primary disc of the compressor rotor assembly can be smoothly separated until the front inner half ring of the bearing 3 is separated, and the purpose of separating the inner half ring of the bearing 3 is to facilitate the subsequent smooth separation of the compressor rotor assembly.

However, after the front inner half ring of bearing No. 3 is separated in step S1, the axial supporting force of the cage of bearing No. 3 is lost and the rotor can be lifted in the axial direction. And the rear spigot of the particle separator component of the cold end unit body is in positioning connection with the front flange of the compressor casing through a spigot, the fit clearance is 0.01-0.068 mm, the rear spigot of the compressor casing component is in positioning connection with the front flange of the impeller housing through a spigot, the fit clearance is 0-0.06 mm, the front spigot of the impeller housing is in positioning connection with the front flange of the casing component in the diffuser through a spigot, the fit clearance is 0.031-0.029 mm, namely the clearance fit is 0-0.031 mm or the interference fit is 0-0.029 mm, and the spigot fit structure of the casing component in the impeller housing and the diffuser can deform due to high temperature in an engine test car, so that the clearance between the impeller housing and the casing component in the diffuser is smaller or larger. If the interference between the centrifugal impeller outer cover and the connecting spigot of the casing component in the diffuser is large, the rotor can be lifted up inevitably at the same time when the casing component in the diffuser is decomposed, the retainer and the balls of the No. 3 bearing fall off because of being separated from the constraint of the inner ring, the axial and radial positioning capabilities of the front section of the rotor are lacked, and the problem of clamping stagnation is inevitably generated when the rotor returns. And the minimum unilateral clearance of the blade tips of the rotors and the stators of the compressor is 0.229mm, the minimum unilateral clearance of the rotor and the stators is positioned at the matching position of the labyrinth and the copper-silver-zinc sealing ring, the clearance is 0.025mm, the copper-silver-zinc sealing ring can be deformed after being scraped, ground and extruded by the labyrinth after the engine is run in, the clearance between the copper-silver-zinc sealing ring and the stators is further reduced, and the matching position of the rotor and the stators is more difficult to decompose. Therefore, in the process of lifting the rotor, axial collision and abrasion can occur on the blade root of the exhaust edge of the compressor rotor, the blade tip of the inlet edge of the stator and the coating of the flow channel of the compressor casing due to the reduction of the axial clearance of the rotor and the stator.

Therefore, in step S2, in order to ensure the centering function of the bearing retainer No. 3, an assembly bracket is manufactured according to the inner diameter of the bearing track No. 3, namely the assembly bracket has a track bearing surface identical to the front inner half ring of the bearing No. 3, the assembly bracket is installed on the shaft neck of the primary blade disc of the compressor through internal threads, after the front inner half ring of the bearing No. 3 is separated in step S1, the assembly bracket can replace the front inner half ring of the bearing No. 3 and provide an axial bearing force for the retainer, the bearing retainer No. 3 and the balls can be effectively prevented from falling off, and the coaxiality of the front bearing of the rotor of the compressor and the stator is ensured.

It can be understood that in step S3, firstly, the assembly vehicle is shaken to make the cold end unit body in a vertical state so as to be decomposed, at this time, the cold end unit body is radially positioned by means of the No. 3 bearing and the No. 4 bearing, and the No. 3 bearing provides axial supporting force through an assembly bracket, so that the retainer and the ball thereof can be prevented from dropping, and the No. 3 bearing can be ensured to normally work. Then the assembly base is placed at the bottom of the assembly vehicle, the height of the assembly vehicle is axially adjusted, the assembly base is attached to the assembly support in place, and the phenomenon that the No. 3 bearing retainer falls off due to the fact that the No. 3 bearing is in a suspended state after the compressor rotor assembly is subsequently separated is prevented.

Specifically, as shown in fig. 2, the assembly base includes a first pin 1, a support 2, a first bushing 3, a second pin 4, a second bushing 5, a base 6, a first guide sleeve 7, a cylindrical pin 8, a guide pillar 9, a spring 10, a second guide sleeve 11, a baffle 12, a third bushing 13, a screw 14, and a rubber pad 15, the base 6 is fixed on the assembly vehicle through three second pins 4 uniformly distributed, the second bushing 5 is a fixed bushing, and the second bushing 5 is sleeved on the second pin 4 and is used for fixing the second pin 4 in a pin hole on the base 6. First bush 3 cover is established on the lower extreme of support 2 and both through 1 fixed connection of first bolt, 3 screws 14 and the 6 fixed connection of base that first bush 3 still passes through the equipartition are convenient for install and disassemble. Rubber pad 15 is fixed to be set up at the upper surface of base 6 for play buffer protection's effect, prevent that the lower extreme of cold junction cell cube from taking place the gouge with base 6. It will be appreciated that the rubber pad 15 is secured to the upper surface of the base 6 by means of adhesive. The middle of the base 6 is hollow, the guide post 9 is located above the support 2, the lower end of the guide post 9 extends into the opening above the support 2, so that the guide post 9 is limited in the radial direction, the guide post 9 can move axially in the opening above the support 2, the baffle 12 is sleeved at the upper end of the guide post 9 and attached to the upper surface of a boss at the upper end of the guide post 9, the second guide sleeve 11 is sleeved on the baffle 12 and fixedly connected with the baffle 12, the third bush 13 is arranged above the baffle 12 and the second guide sleeve 11 and fixedly connected with the baffle 12 and the second guide sleeve 11, the third bush 13 is used for being matched with an assembly support, and the second guide sleeve 11, the baffle 12, the third bush 13 and the guide post 9 are fixedly connected into a whole. The spring 10 is sleeved on the guide post 9, a first end of the spring 10 abuts against the lower surface of a boss at the upper end of the guide post 9, and a second end of the spring 10 abuts against the upper surface of the support 2. The first guide sleeve 7 is sleeved on the guide post 9 and is in small clearance fit with the guide post 9, so that the guide post 9 can be radially limited, the cylindrical pin 8 is used for axially limiting the first guide sleeve 7, meanwhile, the cylindrical pin 8 also has the function of limiting the maximum distance of downward movement of the second guide sleeve 11, the baffle 12, the third bushing 13 and the guide post 9 integrally, the spring 10 is prevented from being compressed excessively and cannot recover elasticity, specifically, a waist-shaped through hole is symmetrically formed in two sides of the first guide sleeve 7, and the cylindrical pin 8 can be inserted into the waist-shaped through hole to achieve a limiting effect. When the third bush 13 is matched with the assembling bracket, due to the gravity action of the cold end unit body, the cold end unit body downwards extrudes the third bush 13 so as to drive the third bush 13, the second guide sleeve 11, the baffle 12 and the guide post 9 to integrally move downwards, and the spring 10 is compressed. After the compressor rotor assembly is separated, the assembling support fixed on the primary blade disc shaft neck of the compressor is separated along with the compressor rotor assembly, the third bushing 13 is not subjected to downward pressure brought by the assembling support, the spring 10 recovers deformation to drive the guide pillar 9, the baffle 12, the second guide sleeve 11 and the third bushing 13 to integrally move upwards, so that the No. 3 bearing retainer falls on the second guide sleeve 11, the second guide sleeve 11 supports the ball so that the ball is contacted with the No. 3 bearing outer ring to form a whole, the inner rail of the bearing outer ring provides upward supporting force for the ball, the No. 3 bearing retainer is ensured not to fall, and the centering effect of the No. 3 bearing is ensured. In the existing disassembling method, after the compressor rotor assembly is disassembled, the No. 3 bearing loses the centering and falls down, so that the No. 3 bearing retainer needs to be fixed by both hands when the compressor rotor assembly is disassembled every time, and safety accidents are easy to happen. The assembling base is installed to be matched with the assembling support, and after the assembling support is separated along with the compressor rotor assembly, the second guide sleeve 11 of the assembling base can replace the assembling support to play a role in fixing the retainer, so that the No. 3 bearing is prevented from falling. Preferably, the inner wall of the third bushing 13 is a tapered surface, so that the second guide sleeve 11 can be in seamless transition with the mounting bracket. It will also be appreciated that the rubber pad 15 may be omitted; the first bolt 1 can be omitted, and the support 2 and the first bush 3 are integrally formed or are integrally connected by welding; the cylindrical pin 8 may be omitted; the second pin 4 and the second bush 5 may be omitted.

It can be understood that, in the step S4, the turbine connecting shaft is divided, and since the inner ring of the bearing No. 4 is mounted on the turbine connecting shaft, the inner ring of the bearing No. 4 is divided along with the turbine connecting shaft, and then the process shaft mounted with the inner ring of the bearing No. 4 is loaded instead of the turbine connecting shaft, so as to ensure that the bearing No. 4 can still perform the centering function.

It can be understood that, in the step S5, considering that a section of the spigot of the impeller housing is a conical surface, as shown in fig. 3, the conical surface of the spigot of the impeller housing is tied by a pair of half hoops 21, the pair of half hoops 21 forms a hoop ring after being tied, the hoop ring is uniformly provided with a plurality of support lugs 211, and the support lugs 211 are respectively screwed with the jackscrews until the rear end surfaces of the jackscrews are attached to the ribs of the casing assembly in the diffuser, so that the casing in the diffuser can be separated from the impeller housing. It is understood that the number of the lugs 211 is preferably 3. In the traditional decomposition process, the casing component in the diffuser is pried by the aid of the straight line, but the casing component in the diffuser and the matching spigot of the outer cover of the impeller are clamped and blocked due to uneven stress, and the mounting spigot of the outer cover of the impeller can be crushed in the prying process of the straight line. The inventors of the present application have also attempted to decompose the casing component in a diffuser by: before decomposition, the rubber hammer is used for slightly and uniformly knocking the casing component in the diffuser upwards to enable the casing to be loosened and generate a gap, the casing is pried by using a straight line, and the problems of rotor clamping stagnation and rotor and stator blade axial collision and abrasion caused by incomplete separation of the casing component in the impeller outer cover and the diffuser still exist. The conical surface at the spigot position of the impeller outer cover is tightened by adopting the pair of half hoops 21, then the three jackscrews are symmetrically screwed, the applied jacking force is uniformly distributed, the rear end surface of the jackscrew is attached to the ribs of the casing component in the diffuser, the casing and the impeller outer cover can be smoothly separated, the impeller outer cover and the casing in the diffuser cannot be damaged, and the assembling bracket is adopted to replace the half ring in the No. 3 bearing in the step S2, when the casing component in the diffuser is separated, the retainer and the balls of the No. 3 bearing cannot fall off, the rotor cannot be lifted along with the casing component in the diffuser, so that the problems of rotor clamping stagnation and rotor stator axial collision and abrasion cannot be caused. In addition, preferably, before the casing assembly and the impeller outer cover in the diffuser are decomposed, the first-stage regulating ring and the second-stage regulating ring of the compressor are rotated anticlockwise to increase the axial gap between the stator blade of the casing of the compressor and the rotor blade of the compressor, so that the axial collision and abrasion between the casing assembly and the rotor in the diffuser in the process of decomposing the casing assembly and the impeller outer cover can be avoided.

It can be understood that, in the step S6, after the casing component in the lower diffuser is disassembled, the compressor casing component, the compressor rotor component and the particle separator component are sequentially separated, and in the process of separating the compressor rotor component, because the assembling base is provided in the step S3 to match with the assembling bracket, when the assembling bracket is separated along with the compressor rotor component, the assembling base can prop open the balls of the bearing No. 3, so that the balls are contacted with the bearing outer ring to form a whole, and the inner rail of the bearing outer ring provides an upward supporting force for the balls, so as to ensure that the balls and the retainer of the bearing No. 3 do not fall off, and still have a centering effect.

It can be understood that, in the step S7, after the compressor casing assembly, the compressor rotor assembly and the particle separator assembly are disassembled, the bearing retainer No. 3 on the assembly base is removed, and the disassembling process of the cold end unit body is finished.

The invention relates to a method for decomposing a cold end unit body, which comprises the steps of firstly transversely arranging the cold end unit body, wherein the cold end unit body can be radially positioned without depending on No. 3 and No. 4 bearings, smoothly separating parts on a primary disc of a compressor rotor assembly until the front inner half ring of the No. 3 bearing is separated, then installing an assembling bracket to replace the front inner half ring of the No. 3 bearing to support the No. 3 bearing retainer, ensuring that the No. 3 bearing still can play a centering role in the subsequent decomposition process, then installing an assembling base after the cold end unit body is placed in a vertical state, and matching the assembling base and the assembling bracket in place, thereby ensuring that the assembling base can replace the assembling bracket when the subsequent assembling bracket is separated along with the compressor rotor assembly, ensuring that the No. 3 bearing retainer does not fall in a suspended state, and the No. 3 bearing still can play a centering role, and then, after the turbine connecting shaft is separated, the process shaft provided with the No. 4 bearing inner ring is used for replacing the turbine connecting shaft, so that the No. 4 bearing can keep a centering effect, then the casing component, the compressor rotor component and the particle separator component in the lower diffuser are sequentially separated, and finally the No. 3 bearing retainer on the assembling base is taken down. According to the method for decomposing the cold end unit body, the No. 3 bearing and the No. 4 bearing are always guaranteed to keep the centering effect in the whole decomposing process, the problems of rotor clamping stagnation, rotor and stator axial collision and grinding and the falling of the No. 3 bearing retainer are avoided in the decomposing process, the reliability, the stability and the safety of the decomposing process are improved, and the scientific research and production progress is guaranteed. In addition, a pair of half hoops 21 are adopted to tighten the conical surface at the seam allowance position of the impeller outer cover in the process of separating the casing component in the air compressor, then three jackscrews are evenly screwed in, the applied jacking force is even, the casing in the impeller outer cover and the casing in the diffuser cannot be damaged in the process of decomposing the casing and the impeller outer cover, and because the assembly support is adopted to replace the half rings in the No. 3 bearing in the step S2, when the casing component in the diffuser is separated, the retainer and the balls of the No. 3 bearing cannot fall off, the rotor blade cannot be lifted together with the casing component in the diffuser, and therefore the problems of rotor clamping stagnation and rotor stator axial collision and abrasion cannot be caused.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for decomposing cold end unit bodies is characterized in that,

the method comprises the following steps:

step S5: dividing a casing component in the diffuser;

step S7: and taking down the No. 3 bearing retainer on the assembly base.

2. The cold end unit cell decomposition method of claim 1,

the step S5 specifically includes:

the conical surface at the seam allowance of the impeller outer cover is tied by using a pair of half hoops (21), the pair of half hoops (21) are tied to form a hoop ring, a plurality of support lugs (211) are uniformly arranged on the hoop ring, and the support lugs (211) are respectively screwed with the jackscrews until the rear end face of the jackscrew is attached to ribs of a casing component in the diffuser and then is separated from the impeller outer cover in the diffuser.

3. The cold end unit cell decomposition method of claim 2,

the method for decomposing the cold end unit bodies further comprises the following steps before the step S5:

4. The cold end unit cell decomposition method of claim 1,

the assembling base in the step S3 comprises a support (2), a first bushing (3), a base (6), a first guide sleeve (7), a guide post (9), a spring (10), a second guide sleeve (11), a baffle (12) and a third bushing (13), the base (6) is arranged on an assembling vehicle, the first bushing (3) is fixedly sleeved on the support (2) and is fixedly connected with the base (6), the guide post (9) is positioned above the support (2), the lower end of the guide post (9) extends into an opening at the upper end of the support (2) and can axially move in the opening, the first guide sleeve (7) is sleeved on the guide post (9) and is in clearance fit with the guide post, the baffle (12) is sleeved on the guide post (9) and is attached to the upper surface of an upper end boss of the guide post (9), the second guide sleeve (11) is fixedly sleeved on the baffle (12), the third bushing (13) is located above the baffle (12) and fixedly connected with the baffle, the third bushing (13) is used for being matched with an assembly support, the spring (10) is sleeved on the guide pillar (9), a first end of the spring (10) abuts against the lower surface of an upper end boss of the guide pillar (9), a second end of the spring (10) abuts against the upper surface of the support (2), after the assembly support and the third bushing (13) are matched in place, the assembly support provides a downward force for the third bushing (13) to push the third bushing (13), the guide pillar (9), the second guide sleeve (11) and the baffle (12) to integrally move downwards, and the spring (10) is compressed; after the assembling support is separated along with the compressor rotor assembly, the spring (10) restores to deform so as to drive the third bushing (13), the guide pillar (9), the second guide sleeve (11) and the baffle (12) to integrally move upwards, and the second guide sleeve (11) plays a role in fixing the No. 3 bearing retainer.

5. The cold end unit cell decomposition method of claim 4,

the assembly base further comprises a rubber pad (15) fixedly arranged on the upper surface of the base (6) and used for preventing the lower end of the cold end unit body from being gouged with the base (6).

6. The cold end unit cell decomposition method of claim 5,

the assembling base further comprises a cylindrical pin (8) which is used for axially limiting the first guide sleeve (7) and limiting the maximum distance of the whole downward movement of the second guide sleeve (11), the baffle (12), the third bushing (13) and the guide post (9).

7. The cold end unit cell decomposition method of claim 6,

first bush (3) cover is established on support (2) and both through first bolt (1) fixed connection, first bush (3) through screw (14) of equipartition with base (6) fixed connection.

8. The cold end unit cell decomposition method of claim 7,

the assembling base further comprises a second bolt (4) and a second bush (5), the base (6) is fixed on an assembling vehicle through the second bolts (4) which are uniformly distributed, and the second bush (5) is sleeved on the second bolt (4) and used for fixing the second bolt (4) in a bolt hole of the base (6).

9. The cold end unit cell decomposition method of claim 8,

the inner wall of the third lining (13) is a conical surface.

10. The cold end unit cell decomposition method of claim 1,

the assembling bracket in the step S2 has a runway bearing surface with the same radius as the front inner half ring of the bearing No. 3, the assembling bracket is mounted on the journal of the stage disk of the compressor through internal threads, and after the front inner half ring of the bearing No. 3 is separated, the assembling bracket replaces the front inner half ring of the bearing No. 3 to play a role of supporting the retainer.