CN111230402B - Repair process for drive support frame shell of nuclear power plant - Google Patents
Repair process for drive support frame shell of nuclear power plant Download PDFInfo
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- CN111230402B CN111230402B CN202010127343.XA CN202010127343A CN111230402B CN 111230402 B CN111230402 B CN 111230402B CN 202010127343 A CN202010127343 A CN 202010127343A CN 111230402 B CN111230402 B CN 111230402B
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention relates to the technical field of equipment management of nuclear power plants, and provides a repair process of a driving support frame shell for a nuclear power plant, which comprises the steps of obtaining a first diameter of a packing chamber of the driving support frame shell and a first depth of a packing retaining wall in the packing chamber; manufacturing a packing cavity sleeve, wherein the packing cavity sleeve comprises a body which is of a tubular structure and is used for accommodating a packing, a supporting edge is arranged on the outer side wall of the body, and a retaining edge used for supporting the packing is arranged on the inner side wall of the body; the outer diameter of the body is matched with the first diameter; install packing chamber cover in the packing chamber, the support limit is supported and is leaned on in drive support frame casing, and the extending depth of flange in the packing chamber matches with first degree of depth. The packing chamber cover makes the packing fixed reach sealed effect after installing in the packing chamber. Under the condition that the drive support frame shell is not replaced, the problem of leakage of a shaft seal packing cavity of the filter is solved, the cost is reduced, and the safety of the unit is improved.
Description
Technical Field
The invention relates to the technical field of equipment management of nuclear power plants, in particular to a repair process for a shell of a driving support frame of a nuclear power plant.
Background
The packing chamber is arranged in the drive support frame shell of the filter on the water pump of the nuclear power plant, the packing chamber is cylindrical, a plurality of superposed packing elements are filled in the packing chamber, and the lower wall of the packing chamber is convexly provided with a packing retaining wall for supporting the packing element. The platform of drive support frame casing is equipped with the gland, and the gland cover is established on the sealing bolt and is pressed and cover on the packing of superpose. The nut of the sealing bolt is screwed down, the gland applies pressure downwards to compress the packing, and the sealing effect is achieved.
However, after the water pump runs for a long time, the packing retaining wall for fixing the packing on the lower wall of the packing chamber of the drive support frame shell is corroded and falls off, so that the packing cannot be fixedly sealed, the problem of leakage of the packing chamber of the shaft seal of the filter easily occurs, and great hidden danger can be caused to the nuclear safety of the unit.
Disclosure of Invention
The invention mainly aims to provide a repair process for a drive support frame shell of a nuclear power plant, and aims to solve the technical problem that packing cannot be fixedly sealed due to corrosion and falling of a packing retaining wall of the drive support frame shell.
In order to achieve the above object, the present invention provides a repair process for a drive support frame shell of a nuclear power plant, which comprises the following steps:
acquiring a first diameter of a packing cavity of a drive support frame shell and a first depth of a packing retaining wall in the packing cavity;
manufacturing a packing cavity sleeve, wherein the packing cavity sleeve comprises a body which is of a tubular structure and is used for accommodating a packing, a supporting edge is arranged on the outer side wall of the body, and a retaining edge used for supporting the packing is arranged on the inner side wall of the body; the outer diameter of the body is matched with the first diameter;
install packing chamber cover in the packing chamber, the support limit is supported and is leaned on in drive support frame casing, and the extending depth of flange in the packing chamber matches with first degree of depth.
Further, still include between the first degree of depth step of packing cavity and the preparation packing chamber cover step of obtaining the first diameter and the packing that drive support frame casing's packing cavity:
processing the driving support frame shell, and enlarging the aperture of the packing cavity, wherein the enlarged aperture of the packing cavity is a second diameter;
and manufacturing the packing cavity sleeve according to the second diameter and the first diameter, wherein the outer diameter of the body is matched with the second diameter, and the inner diameter of the body is matched with the first diameter.
Furthermore, the aperture of the packing chamber is expanded by 3-4 mm.
Furthermore, the packing cavity sleeve is manufactured in a turning mode, and the support frame shell is driven to expand the aperture of the packing cavity in a boring mode.
Further, the outer wall of body and the inner wall of packing cavity are interference fit.
Further, the minimum interference of the interference fit is 0.04 mm.
Further, install packing chamber cover in the packing chamber and include:
the supporting edge is set to be an annular supporting edge, and a plurality of mounting holes are formed in the annular supporting edge;
the packing cavity sleeve extends into the packing cavity, and the mounting hole is matched with a sealing bolt of the driving support frame shell;
the gland bush is sleeved on the sealing bolt and screwed tightly, so that the annular supporting edge is tightly pressed on the driving support frame shell.
Furthermore, the mounting holes are arranged on the annular supporting edge at intervals by taking the central axis of the annular supporting edge as the center.
Further, the end face of the supporting edge is flush with the end face of the body, and the thickness of the supporting edge ranges from 8mm to 9 mm.
Furthermore, the packing cavity sleeve is made of stainless steel.
According to the repairing process for the drive support frame shell of the nuclear power plant, the packing cavity sleeve is manufactured according to the first diameter of the packing cavity and the first depth of the packing retaining wall. The packing chamber cover is installed in the indoor back of packing chamber, and the flange matches with first degree of depth at the indoor extension degree of depth of packing chamber, can replace packing retaining wall to support the packing for the packing is fixed and is reached sealed effect. Under the condition that the drive support frame shell is not replaced, the problem of leakage of a shaft seal packing cavity of the filter is solved, the cost is reduced, and the safety of the unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a packing cavity sleeve according to an embodiment of the present invention;
FIG. 2 is another perspective structural view of the packing cavity sleeve of FIG. 1;
FIG. 3 is a schematic view of another perspective structure of the packing cavity sleeve of FIG. 1;
FIG. 4 is a schematic view of the packing cavity sleeve and the drive cage housing in accordance with an embodiment of the present invention;
fig. 5 is a sectional view taken along line a-a of fig. 4.
The reference numbers illustrate:
10. a drive support frame housing; 20. a packing chamber; 30. a platform; 40. a seal bolt;
100. a body; 200. a support edge; 300. blocking edges; 110. a through hole; 210. and (7) installing holes.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection or electrical connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
When the filter packing leakage problem on the water pump is detected in a disassembly mode, the situation that the packing retaining wall used for fixing the packing is corroded to fall off under the lower wall of the packing cavity 20 of the drive support frame shell 10 is found, the packing cannot be fixed, and the packing extrusion cavity cannot be sealed to generate leakage.
The water pump is a cold source device, and needs to be reinstalled on site as soon as possible, and if the defects cannot be solved quickly, the safe operation of the unit is greatly challenged. However, the driving support frame shell 10 has no spare parts to be replaced, and the driving support frame shell 10 is purchased from abroad, so that the manufacturing cost is high, the re-purchasing cost is high, the arrival period is long, the requirement for rapidly solving the problem cannot be met, and only the strategy of field maintenance can be adopted. Typically, field repairs are made by welding a new packing retaining wall within the wall of the packing chamber 20. Due to the particularity of the drive carriage housing 10, this solution presents the following drawbacks:
1. the welding conditions are harsh
If the driving support frame shell 10 is made of cast steel, the possibility of cracking of the driving support frame shell 10 after welding is very high. If a welder with high skill is needed to weld, the driving support frame shell 10 is heated in a special environment, such as a large enough oven, and the welding can be performed after a certain temperature is reached.
2. Difficulty in post-welding processing
Due to the fact that the size of the driving support frame shell 10 is large, a welding point cannot be machined on a common lathe, a boring machine is needed for machining, and the required machining precision is difficult to achieve through the machining mode of the boring machine.
3. Higher use risk and limited service life after welding processing
Due to the limitation of the welding mode of the packing retaining wall, the strength of the retaining ring is not high after the packing retaining wall is machined, the risk of falling of the retaining ring exists in the using process, the service life is limited, and if the retaining ring falls off in the cycle period of the unit, irreversible loss can be caused to the unit.
Because the welding process conditions are harsh, the machining after welding is difficult, and the service life is limited, the cost is not cost-effective, and the risk is extremely high in the use process, so that the process of welding a packing retaining wall fixing method cannot be adopted.
The invention is proposed to achieve the above object, and referring to fig. 1, 4 and 5, in one aspect, the invention provides a repair process for a drive support frame shell of a nuclear power plant, comprising the following steps:
s100: a first diameter of a packing cavity of a drive support frame shell and a first depth of a packing retaining wall in the packing cavity are obtained.
In the step S100, the first diameter of the packing cavity and the first depth of the packing retaining wall in the packing cavity may be obtained by physically measuring or querying a design drawing. And then manufacturing the packing cavity sleeve according to the parameters of the first diameter of the packing cavity and the first depth of the packing retaining wall.
S200: manufacturing a packing cavity sleeve, wherein the packing cavity sleeve comprises a body which is of a tubular structure and is used for accommodating a packing, a supporting edge is arranged on the outer side wall of the body, and a retaining edge used for supporting the packing is arranged on the inner side wall of the body; the outer diameter of the body is matched with the first diameter, and the wall thickness of the body is 3-4 mm.
In the S200 step, the packing cavity sleeve is used for being installed in the packing cavity 20 of the drive support frame shell 10 of the filter, the packing cavity sleeve comprises a body 100 which is of a tubular structure and is used for containing a packing, the outer side wall of the body 100 is provided with a supporting edge 200 which is used for abutting against the drive support frame shell 10, and the inner side wall of the body 100 is provided with a flange 300 which is used for supporting the packing.
Referring to fig. 1, 4 and 5, the packing pocket is mated with the packing cavity 20 of the drive cage housing 10, mounting the packing pocket within the packing cavity 20. The body 100 of the packing cavity sleeve is abutted against the drive support frame shell 10 through the supporting edge 200, and the packing is placed in the tubular structure of the body 100 and supported through the retaining edge 300, so that the packing is fixed to achieve a sealing effect. The packing cavity sleeve is smaller than the drive support frame shell 10 in volume, is mounted in the packing cavity 20 after the outer processing of the drive support frame shell 10 is finished, is not limited by the space of the drive support frame shell 10 during processing, and can be processed by a processing mode with higher precision such as turning according to the requirement. And packing chamber cover easy dismounting, after the packing chamber cover damages, can process the packing chamber cover of installation renewal new fast, effectively reduce the cost of purchasing the background, and need not do new adjustment to packing chamber 20.
Referring to fig. 1 to 3, the body 100 of the packing cavity sleeve is of a tubular structure and has an inner cavity, the inner cavity is matched with a packing, and the packing can be stacked in the inner cavity of the body 100. The shape and specification of the inner cavity of the body 100 are the same as those of the packing chamber 20, so as to ensure that the operation environment of the packing in the packing chamber is the same as the packing chamber 20 of the drive support frame shell 10 before maintenance. If the packing chamber cover is directly placed in the packing chamber 20, because the influence of the wall thickness of the body 100, the diameter of the packing chamber cover is slightly smaller than that of the packing chamber 20, so that the wall thickness of the body 100 can be reduced as much as possible on the premise of ensuring the strength of the packing chamber cover. Because the packing has certain control range, so can better adapt to the packing chamber cover, can not receive the influence of the diameter difference of packing chamber cover. Certainly still can process drive support frame casing 10, suitably cut down self wall thickness and enlarge the diameter of packing cavity 20, cut down the wall thickness and the wall thickness of the body 100 of packing cavity cover unanimously or slightly big, the diameter design of packing cavity cover is unanimous with the original diameter of packing cavity 20. The working environment of the packing is basically consistent with that before maintenance, and the stability of the equipment is better.
The drive support frame shell 10 can be machined in a common boring mode, the machining precision of the boring mode is low, and the inner wall surface of the packing cavity 20 is not a working surface of a packing. The packing is placed in the packing chamber 20, and the inside wall of the packing chamber 20 is the working face of the packing. The packing chamber 20 is machined with high precision, so that the packing is not affected by the treatment method.
The outer diameter of the body matches the first diameter, i.e., the outer wall of the body 100 mates with the inner wall of the packing chamber 20, see fig. 4 and 5, such as a clearance fit or an interference fit.
S300: install packing chamber cover in the packing chamber, the support limit is supported and is leaned on in drive support frame casing, and the extending depth of flange in the packing chamber matches with first degree of depth.
In step S300, referring to fig. 1 to 3, a supporting edge 200 is disposed on an outer side wall of the body 100, and the supporting edge 200 protrudes from the body 100 and abuts against the driving support frame housing 10, so that the body 100 is suspended on the platform 30 of the driving support frame housing 10.
The extending depth of the flange in the packing cavity is matched with the first depth, namely the packing cavity is sleeved on the packing cavity, and the position of the flange and the position of the packing retaining wall before the packing retaining wall is corroded and falls is basically consistent. The packing is placed in the tubular structure of the body 100 with the bottom supported by the ribs 300. The shape and size of the flange 300 are substantially identical to those of the packing retaining wall, thereby replacing the packing retaining wall and performing the same function.
After the packing cavity sleeve and the packing are placed in place, the gland of the platform 30 of the driving support frame shell 10 is matched with the sealing bolt 40 and is pressed downwards until the gland is contacted with the end face of the supporting edge 200 or the body 100, and pressure is applied to press the packing, so that the sealing effect is achieved. Due to the pressing of the pressing cover, the supporting edge 200 itself can be movably connected with the driving support frame shell 10, for example, movably abutted against the driving support frame shell 10, and finally pressed on the driving support frame shell 10 along with the pressing of the pressing cover. Of course, the supporting edge 200 itself may also be adhered or fixedly connected to the driving support frame housing 10 by means of a connecting member, etc., i.e., it may also be fixed to the driving support frame housing 10 without a pressing cover. The supporting edge 200 may be an annular supporting edge disposed around the body 100, or may be a plurality of protrusions disposed at intervals in a dispersed manner, for example, two protrusions disposed symmetrically form a hanging loop, and the supporting edge 200 only needs to be abutted against the driving support frame housing 10, so that the body 100 is hung on the driving support frame housing 10.
According to the repairing process for the drive support frame shell of the nuclear power plant, the packing cavity sleeve is manufactured according to the first diameter of the packing cavity and the first depth of the packing retaining wall. After the packing cavity sleeve is installed in the packing cavity 20, the extending depth of the flange 300 in the packing cavity is matched with the first depth, and the flange can replace a packing retaining wall to support a packing, so that the packing is fixed to achieve a sealing effect. Under the condition that the drive support frame shell 10 is not replaced, the problem of leakage of the shaft seal packing chamber 20 of the filter is solved, the cost is reduced, and the safety of the unit is improved.
Optionally, the step of obtaining the first diameter of the packing cavity of the drive support housing and the packing retaining wall between the step of the first depth of the packing cavity and the step of manufacturing the packing cavity sleeve further comprises:
processing the driving support frame shell, and enlarging the aperture of the packing cavity, wherein the enlarged aperture of the packing cavity is a second diameter;
and manufacturing the packing cavity sleeve according to the second diameter and the first diameter, wherein the outer diameter of the body is matched with the second diameter, and the inner diameter of the body is matched with the first diameter.
When the packing chamber 20 is not being processed, the packing cavity sleeve is directly placed in the packing chamber 20, and the diameter of the packing cavity sleeve is slightly smaller than that of the packing chamber 20 due to the influence of the wall thickness of the body 100. Therefore, the driving support frame shell 10 can be processed, the wall thickness of the driving support frame shell is properly reduced, the diameter of the packing cavity 20 is enlarged, and the diameter of the packing cavity is the second diameter. The packing cavity sleeve is redesigned, the inner diameter of the packing cavity sleeve is designed to be basically consistent with the original diameter of the packing cavity 20, namely the first diameter, and the outer diameter of the packing cavity sleeve is designed to be basically consistent with the diameter of the expanded packing cavity 20, namely the second diameter. Under the condition, the inner diameter of the packing cavity sleeve is basically consistent with the diameter of the packing cavity 20 before treatment, the working environment of the packing is basically consistent with the working environment before maintenance, and the stability of the equipment is better.
Optionally, the expanding range of the aperture of the packing chamber is 3-4 mm.
Under this condition, the amount of machining for reaming the packing chamber 20 is relatively small, reducing its influence on the drive cage housing 10. Correspondingly, the thickness of the body 100 is also 3-4 mm, and the strength of the packing chamber 20 can be ensured.
Optionally, the packing cavity sleeve is manufactured in a turning mode, and the driving support frame shell is used for expanding the aperture of the packing cavity in a boring mode.
The packing cavity sleeve is smaller than the drive support frame shell 10 in volume, is mounted in the packing cavity 20 after the outer processing of the drive support frame shell 10 is finished, is not limited by the space of the drive support frame shell 10 during processing, and can be processed by a processing mode with higher precision such as turning according to the requirement. The drive support frame shell 10 can be machined in a common boring mode, the machining precision of the boring mode is low, and the inner wall surface of the packing cavity 20 is not a working surface of a packing. The packing is placed in the packing chamber 20, and the inside wall of the packing chamber 20 is the working face of the packing. The packing chamber 20 is machined with high precision, so that the packing is not affected by the treatment method. The packing cavity sleeve is manufactured in a turning mode, the driving support frame shell is machined in a boring mode, and machining modes of all parts are reasonably distributed, so that machining difficulty is reduced, and overall precision of products cannot be reduced.
Optionally, referring to FIGS. 4-5, the outer wall of the body 100 is an interference fit with the inner wall of the packing chamber 20. The mode of interference fit for the packing chamber cover combines together firmly with the packing cavity 20 two, reduces the use, and especially the gland compresses tightly the possibility that the packing chamber cover takes place to rock and axial rotation in-process. And the leakage between the packing cavity sleeve and the packing cavity 20 can be prevented, and the sealing performance of the drive support frame shell 10 is ensured.
Optionally, the interference of the interference fit is greater than or equal to 0.04 mm. Under this magnitude of interference, both can guarantee the steadiness that packing chamber cover and packing cavity 20 combine and the leakproofness of drive support frame casing 10, can guarantee packing chamber cover simple to operate again, prevent that the magnitude of interference is too big, cause packing chamber cover or drive support frame casing 10 to appear the damage.
Optionally, installing the packing cavity sleeve in the packing cavity chamber comprises:
the supporting edge is set to be an annular supporting edge, and a plurality of mounting holes are formed in the annular supporting edge;
the packing cavity sleeve extends into the packing cavity, and the mounting hole is matched with a sealing bolt of the driving support frame shell;
the gland bush is sleeved on the sealing bolt and screwed tightly, so that the annular supporting edge is tightly pressed on the driving support frame shell.
Specifically, establish the support limit into annular support limit, a plurality of mounting holes have been seted up on the annular support limit. The specification and the arrangement of the mounting holes are consistent with those of the sealing bolts of the driving support frame shell. The annular support rim can thus be placed over the sealing bolt via the mounting hole. Then a gland is installed, the gland is sleeved in the sealing bolt and pressed on the annular supporting edge, and a corresponding nut is used for screwing. This mode makes packing chamber cover and drive support frame casing combine more firm, can not appear packing chamber cover along circumferential direction's the condition in the packing chamber.
Optionally, the end surface of the support edge 200 is flush with the end surface of the body 100. The end face of the supporting edge 200 is flush with the end face of the body 100, and the shape of the packing cavity sleeve is regular. When the gland is pressed, the gland is contacted with the end face of the supporting edge 200 and the end face of the body 100 at the same time, the contact area is large, and the damage to the end face of the supporting edge 200 or the end face of the body 100 caused by the overlarge local stress can be prevented.
Alternatively, referring to fig. 1, 4 and 5, the supporting edge 200 is an annular supporting edge, and a plurality of mounting holes 210 for connecting with the driving support frame casing 10 are opened on the annular supporting edge.
The platform 30 of the driving support frame shell 10 is provided with a sealing bolt 40 for fixing a gland, the annular supporting edge is provided with a mounting hole 210, the mounting hole 210 is matched with the sealing bolt 40, the annular supporting edge can be sleeved on the sealing bolt 40, and the gland is pressed above the annular supporting edge. The design can limit the annular supporting edge, and only the annular supporting edge can move along the axial direction of the annular supporting edge under the constraint of the sealing bolt 40, so that the packing cavity is prevented from rotating in the packing cavity 20.
Alternatively, referring to fig. 1 to 3, the mounting holes 210 are spaced apart from each other on the annular supporting edge with the central axis of the annular supporting edge as the center. The design makes the stress of the annular supporting edge balanced and avoids overlarge local stress.
Optionally, the thickness of the supporting edge 200 is 8 mm-9 mm, and the thickness of the rib 300 is 5 mm-10 mm.
After the packing cavity sleeve is placed in the packing cavity 20, when the position of the flange 300 is consistent with that of the packing retaining wall, the thickness of the supporting edge 200 is the difference between the depth of the flange 300 in the packing cavity sleeve and the depth of the packing retaining wall in the packing cavity 20. The thickness of supporting limit 200 is 8mm ~9mm, can guarantee the intensity of supporting limit 200 on the one hand, and on the other hand, all packing during operation of drive support frame casing 10 have normal height parameter range, and the thickness of this supporting limit 200 can not shadow the work of packing in normal range. The thickness of flange 300 is 5mm ~10mm, can guarantee the intensity of flange 300.
Optionally, the inner side wall of the body 100 is provided with a through hole 110 for a cooling pipe to penetrate for cooling and lubricating the packing.
The inner side wall of the body 100 is provided with a through hole 110 through which a cooling pipe is inserted to introduce cooling water. During operation, the packing generates a large amount of heat due to friction with a shaft of the driving support frame shell, the packing is possibly damaged, and the sealing performance is reduced. The cooling water can cool and lubricate the packing, and the service life of the packing is prolonged.
Optionally, the end of the rib 300 away from the supporting edge 200 is provided with a reinforcing rib. This design ensures that the rib 300 has a high strength.
Optionally, the packing cavity sleeve is made of stainless steel. Stainless steel is less expensive, has good workability, and is more susceptible to corrosion in seawater than cast steel, thereby protecting the cast steel drive cage housing 10 to some extent.
Referring to fig. 1 to 3, a supporting edge 200 is disposed on an outer side wall of the body 100, and the supporting edge 200 protrudes from the body 100 and abuts against the driving support frame housing 10, so that the body 100 is suspended on the platform 30 of the driving support frame housing 10. After the packing cavity sleeve and the packing are placed in place, the gland of the platform 30 of the driving support frame shell 10 is matched with the sealing bolt 40 and is pressed downwards until the gland is contacted with the end face of the supporting edge 200 or the body 100, and pressure is applied to press the packing, so that the sealing effect is achieved. It should be understood that the steps of S100 and S200 may be exchanged, that is, the packing cavity is installed in the casing 10 of the driving support frame, and then the packing is installed in the packing cavity.
The application of the packing cavity sleeve in the repair of the drive support frame shell 10 has the advantages that the packing cavity sleeve is adopted, so that the drive support frame shell 10 is repaired under the condition that the drive support frame shell 10 is not replaced, the maintenance cost is reduced, and the maintenance speed and efficiency are improved.
Optionally, before the packing cavity is sleeved in the packing cavity 20 of the drive support frame shell 10, the method further includes processing the drive support frame shell 10 to enlarge the aperture of the packing cavity 20, the enlarged aperture of the packing cavity 20 is matched with the outer diameter of the packing cavity, and the inner diameter of the packing cavity is consistent with the aperture of the packing cavity 20 before reaming.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A repair process for a drive support frame shell of a nuclear power plant is characterized by comprising the following steps:
acquiring a first diameter of a packing cavity of a drive support frame shell and a first depth of a packing retaining wall in the packing cavity;
manufacturing a packing cavity sleeve, wherein the packing cavity sleeve comprises a body which is of a tubular structure and is used for accommodating a packing, a supporting edge is arranged on the outer side wall of the body, and a retaining edge used for supporting the packing is arranged on the inner side wall of the body; the outer diameter of the body is matched with the first diameter;
the packing cavity sleeve is matched with a packing cavity of the drive support frame shell, the packing cavity sleeve is installed in the packing cavity, the supporting edge abuts against the drive support frame shell, and the extending depth of the retaining edge in the packing cavity is matched with the first depth;
wherein, the packing is placed in the tubular structure of body and is passed through the flange supports to be used for fixing and sealing the packing.
2. The repair process for a drive support shell of a nuclear power plant of claim 1, wherein obtaining the first diameter of the packing cavity and the packing retaining wall of the drive support shell between the first depth of the packing cavity step and the packing sleeve making step further comprises:
processing the driving support frame shell, and enlarging the aperture of the packing cavity, wherein the enlarged aperture of the packing cavity is a second diameter;
and manufacturing a packing cavity sleeve according to a second diameter and a first diameter, wherein the outer diameter of the body is matched with the second diameter, and the inner diameter of the body is matched with the first diameter.
3. The repair process for the drive support frame casing of the nuclear power plant according to claim 2, wherein the hole diameter of the packing chamber is enlarged by 3-4 mm.
4. The repair process for the drive cage housing of a nuclear power plant as set forth in claim 2, wherein the packing pocket is manufactured by turning, and the drive cage housing is bored to enlarge the aperture of the packing pocket.
5. The repair process for a drive support housing for a nuclear power plant of claim 1, wherein the outer wall of the body is an interference fit with the inner wall of the packing chamber.
6. A repair process for a drive support frame casing for a nuclear power plant according to claim 5, characterised in that the interference fit has a minimum interference of 0.04 mm.
7. The repair process for a drive support bracket shell for a nuclear power plant of claim 1, wherein installing the packing cavity sleeve within the packing cavity comprises:
the supporting edge is set to be an annular supporting edge, and a plurality of mounting holes are formed in the annular supporting edge;
the packing cavity sleeve extends into the packing cavity, and the mounting hole is matched with a sealing bolt of the driving support frame shell;
and the gland bush is sleeved on the sealing bolt and screwed down, so that the annular supporting edge is tightly pressed on the driving support frame shell.
8. The repair process for a drive support frame casing for a nuclear power plant according to claim 7, wherein each of the mounting holes is arranged on the annular support rim at a spacing centered on a central axis of the annular support rim.
9. The repair process for a drive support frame shell of a nuclear power plant according to claim 1, wherein the end face of the support edge is flush with the end face of the body, and the thickness of the support edge is 8mm to 9 mm.
10. The repair process for the drive support frame shell of the nuclear power plant as claimed in any one of claims 1 to 9, wherein the packing cavity sleeve is made of stainless steel.
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