CN216940485U

CN216940485U - Piston auxiliary fixtures

Info

Publication number: CN216940485U
Application number: CN202122723499.7U
Authority: CN
Inventors: 吴人杰; 刘畅; 刘辉; 刘添; 林磉熙; 严元元; 苏俊
Original assignee: China Nuclear Industry Maintenance Co Ltd
Current assignee: China Nuclear Industry Maintenance Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-07-12
Anticipated expiration: 2031-11-08

Abstract

The application belongs to the technical field of equipment installation, and particularly relates to a piston auxiliary tool which comprises a guide sleeve and an expansion sleeve, wherein the guide sleeve is sleeved at the tail of a piston body; the guide sleeve is provided with a guide surface for sleeving the wear-resistant ring, and the diameter of the cross section of the guide surface is gradually increased from one end of the guide sleeve to the groove of the piston body, so that the inner diameter of the wear-resistant ring is gradually increased when the wear-resistant ring moves towards the groove along the guide surface; a through groove is formed in the peripheral wall of the expansion sleeve, and one end of the through groove extends out of the expansion sleeve to form an opening; when the wear-resistant ring is pushed to move towards the groove of the piston body along the guide surface along with the expansion sleeve, the opening is larger. The piston auxiliary tool can enable the wear-resistant ring to be installed in place at one time, avoids the problem that the outer diameter of the wear-resistant ring is too large due to the fact that the wear-resistant ring is difficult to shrink after being expanded due to repeated installation, and reduces the risk of injury of fingers of people; in addition, the wear-resisting ring does not need to contact with the piston body, and the piston body is prevented from being scratched and damaged.

Description

Piston auxiliary fixtures

Technical Field

This application belongs to equipment fixing technical field, especially relates to a piston auxiliary fixtures.

Background

The piston of the steam-assisted pump differential pressure regulator of the nuclear power plant comprises a piston body, a guide belt, a sealing ring and a wear-resistant ring, wherein the sealing ring is sleeved in a groove in the middle of the piston body, the wear-resistant ring is sleeved on the piston body, the wear-resistant ring is pushed into the groove, and finally the guide belt is installed; in the actual installation process, the elasticity of the sealing ring is large, and the installation is easy; the elasticity of wear-resisting ring is little, if the wear-resisting ring of direct mount, the sealing surface of each step and recess on the wear-resisting ring can the fish tail piston body, seriously influences the sealing performance of piston, and simultaneously, the scratch also easily appears in installer finger to once install wear-resisting ring because of can not be accurate, lead to the reinstallation to make wear-resisting ring constantly rise with heat postshrinkage, cause wear-resisting ring external diameter bigger than normal, influence the use of follow-up piston.

SUMMERY OF THE UTILITY MODEL

The utility model provides a purpose provides a piston auxiliary fixtures, aims at solving the wear ring's among the prior art installation easy fish tail piston body the surface and the technical problem who needs install many times.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the utility model provides a piston auxiliary fixtures, includes:

the guide sleeve is sleeved at the tail part of the piston body; the guide sleeve is provided with a guide surface for sleeving the wear-resistant ring, and the diameter of the cross section of the guide surface is gradually increased from one end of the guide sleeve to the direction of the groove of the piston body, so that the inner diameter of the wear-resistant ring is gradually increased when the wear-resistant ring moves towards the groove along the guide surface; and

the expansion sleeve is sleeved outside the guide sleeve, a through groove is formed in the peripheral wall of the expansion sleeve, and one end of the through groove extends out of the expansion sleeve to form an opening; when the expansion sleeve pushes the wear-resistant ring to move towards the groove of the piston body along the guide surface, the opening is larger.

Optionally, the through groove comprises a circular hole section and a straight line section extending along the axial direction of the expansion sleeve, one end of the straight line section is communicated with the circular hole section, and the other end of the straight line section extends out of the expansion sleeve to form the opening.

Optionally, the diameter of the circular hole section is larger than the groove width of the straight section.

Optionally, the number of the through grooves is greater than or equal to 2, and the through grooves are uniformly arranged at intervals along the circumferential direction of the expansion sleeve.

Optionally, the guide sleeve and the expansion sleeve are both nylon sleeves.

Optionally, the guide surface is a conical surface.

Optionally, a protrusion protruding toward the inside of the guide sleeve is arranged on the inner wall of the guide sleeve, which is close to the opening, and the side surface of the protrusion is flush with the end surface of the guide sleeve, which is close to the opening.

Optionally, the expansion sleeve includes a first circular plate portion and a first annular wall portion surrounding the first circular plate portion, the through groove is opened on the first annular wall portion, the opening is located at an end portion of the first annular wall portion opposite to the first circular plate portion, and the first circular plate portion is provided with a first vent hole;

the guide sleeve comprises a second circular plate part and a second circular wall part surrounding the second circular plate part, and a second ventilation hole is formed in the second circular plate part.

Optionally, the piston auxiliary tool further comprises a pressing sleeve for sleeving the tail of the piston body and pressing the wear-resistant ring into the groove, and an inner edge of the end of the pressing sleeve is chamfered so as to guide the wear-resistant ring to enter between the groove and the pressing sleeve.

Optionally, the compression sleeve is a nylon compression sleeve.

The above-mentioned one or more technical scheme in the piston auxiliary fixtures that this application provided has one of following technological effect at least: when the piston is used, the guide sleeve is sleeved on the piston body, the guide surface is positioned at the tail part of the piston body, the end part of the guide sleeve, which is far away from the small-size end of the guide surface, is close to the groove of the piston body, so that the wear-resistant ring can be easily sleeved on the small-size end of the guide surface, the end part of the expansion sleeve, which is provided with an opening, is sleeved on the small-size end of the guide surface, the expansion sleeve is pushed, the end surface, provided with the opening, of the expansion sleeve is tightly abutted against the wear-resistant ring, and then the wear-resistant ring is continuously pushed to move towards the groove until the wear-resistant ring falls into the groove from the guide sleeve; in the process, as the diameter of the cross section of the guide surface is larger and larger, the diameter of the wear-resistant ring is larger and larger along with the increase of the diameter of the cross section of the guide surface, and meanwhile, the opening on the expansion sleeve is expanded along with the diameter of the cross section of the guide surface, namely, the end part of the expansion sleeve provided with the opening is also expanded along with the diameter of the guide surface, so that the end surface of the expansion sleeve provided with the opening is always in contact with the wear-resistant ring without slipping off, the wear-resistant ring can be installed in place at one time, the phenomenon that the wear-resistant ring is difficult to shrink after being expanded due to repeated installation is avoided, the outer diameter of the wear-resistant ring is larger, and the risk of injury of fingers of personnel is reduced; in addition, the wear-resisting ring always slides on the guide sleeve in the installation process, so that the wear-resisting ring does not need to be in contact with the piston body, and the piston body is prevented from being scratched and damaged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a piston according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a piston mounting bush according to an embodiment of the present application.

Fig. 3 is a front view of a guide sleeve in the piston auxiliary tool provided in the embodiment of the present application.

Fig. 4 is a top view of the guide sleeve shown in fig. 3.

Fig. 5 is a front view of an expansion sleeve in the piston auxiliary tool provided in the embodiment of the present application.

Figure 6 is a top view of the expansion sleeve of figure 5.

Fig. 7 is a front view of a pressing sleeve in the piston auxiliary tool provided in the embodiment of the present application.

Fig. 8 is a top view of the compression sleeve shown in fig. 7.

Fig. 9 is a flowchart illustrating simplified steps of mounting a piston by using the piston auxiliary tool according to the embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10. a piston; 11. a piston body; 12. a seal ring; 13 wear-resistant rings; 14. a guide belt; 111. a trench; 20. A bushing; 30. a guide sleeve; 31. a guide surface; 32. a second circular plate portion; 33. a second annular wall portion; 34. a second vent hole; 40. expanding sleeves; 41. a through groove; 42. a first circular plate portion; 43. a first annular wall portion; 44. a protrusion; 45. a first vent hole; 411. a circular hole section; 412. a straight line segment; 50. a compression sleeve; 51. a third circular plate portion; 52. a third annular wall portion; 53. and a third vent hole.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the related art, referring to fig. 1, a piston 10 of a steam-assisted pump differential pressure regulator of a nuclear power plant comprises a piston body 11, a guide belt 14, a sealing ring 12 and a wear-resistant ring 13, wherein the sealing ring 12 is generally an "O" ring, and the "O" ring and the wear-resistant ring 13 form a sealing ring.

In the installation process of the sealing ring, the O-shaped ring has larger elasticity, so the installation is easier, and the wear-resisting ring 13 has poorer elasticity, so the sealing surface of each step of the piston 10 and the groove 111 can be easily scratched if the wear-resisting ring is directly installed, and the sealing effect is influenced.

When wear-resisting ring 13 installs, the copper uide bushing 30 that uses, this uide bushing 30 is because of the material be the metal, and the wall thickness of uide bushing 30 terminal surface position department only 1mm, and this position is yielding and easily produces the burr, has the great problem of sealing ring damage risk. In the specific installation operation process, when the wear-resistant ring 13 is pressed into the groove 111 in the middle of the piston 10, two persons need to uniformly apply pressure to the end face and the side face of the guide sleeve 30, and because the stress area of fingers on the wear-resistant ring 13 is small, the fingers are easy to slip off from the wear-resistant ring 13, therefore, the wear-resistant ring 13 can be installed into the groove 111 in the middle of the piston 10 only by multiple times of installation sometimes, the method and the tool are not only labor-consuming, but also easily scratched by the fingers of the persons, and cold shrinkage is caused after the wear-resistant ring 13 is continuously heated and expanded due to repeated installation because the wear-resistant ring 13 cannot be accurately installed in place once, so that the outer diameter of the wear-resistant ring 13 is larger, and the use of the subsequent piston 10 is influenced.

Additionally, referring to FIG. 2, after the seal rings are installed, the differential regulator piston 10 is installed in the bushing 20, typically by aligning the bushing 20 with the piston 10 and then slowly manually pressing the piston 10 into the bushing 20; however, when the static pressure effect is not good, the piston 10 needs to be hammered into the bushing 20 by a rubber hammer, and at this time, the wear-resistant ring 13 is heated and expanded, so that the piston 10 is difficult to press into the bushing 20, and once the operation is not proper, the piston 10 is shifted, and the wear-resistant ring 13 is easily damaged.

As shown in fig. 3 to 8, in an embodiment of the present application, a piston auxiliary tool is provided, which is mainly used for installing a seal ring 12 and a wear-resistant ring 13 on a piston body 11, and is suitable for assembling a piston 10 in all equipment requiring the piston 10, in particular for installing a steam-assisted pump differential pressure regulator piston 10 in a nuclear power plant.

The piston auxiliary tool comprises a guide sleeve 30 and an expansion sleeve 40, and referring to fig. 3 and 4, the guide sleeve 30 is used for being sleeved on the tail part of the piston body 11, wherein the inner diameter of the guide sleeve 30 is equal to or slightly larger than the outer diameter of the piston body 11, so that the guide sleeve 30 is convenient to sleeve, and in addition, the tail part of the piston body 11 is the end opposite to the head part of the piston body 11; the guide sleeve 30 is provided with a guide surface 31 for sleeving the wear-resistant ring 13, and the cross-sectional diameter of the guide surface 31 gradually increases from one end of the guide sleeve 30 to the direction of the groove 111 of the piston body 11, so that the inner diameter of the wear-resistant ring 13 gradually increases when the wear-resistant ring 13 moves along the guide surface 31 to the groove 111; the guide surface 31 is a tapered surface, and the wear-resistant ring 13 is gradually widened along with the diameter of the guide surface 31 in the process that the guide surface 31 moves from the small-size end to the large-size end of the guide surface 31; referring to fig. 5 and 6, the expansion sleeve 40 is configured to be sleeved outside the guide sleeve 30; a through groove 41 is formed in the peripheral wall of the expansion sleeve 40, and one end of the through groove 41 extends out of the expansion sleeve 40 to form an opening; the opening is larger as the expansion sleeve 40 pushes the wear sleeve along the guide surface 31 towards the groove 111 of the piston body 11.

Specifically, when the piston auxiliary tool according to the embodiment of the application is used, the guide sleeve 30 is firstly sleeved on the piston body 11, the guide surface 31 is located at the tail of the piston body 11, and the end of the guide sleeve 30, which is far away from the small-size end of the guide surface 31, is close to the groove 111 of the piston body 11, so that the wear-resistant ring 13 can be easily sleeved on the small-size end of the guide surface 31, the end of the expansion sleeve 40, which is provided with the opening, is sleeved on the small-size end of the guide surface 31, the expansion sleeve 40 is pushed, the end face, which is provided with the opening, of the expansion sleeve 40 is tightly abutted on the wear-resistant ring 13, and then the wear-resistant ring 13 is continuously pushed to move towards the groove 111 until the wear-resistant ring 13 falls into the groove 111 from the guide sleeve 30; in the process, as the diameter of the cross section of the guide surface 31 is larger and larger, the diameter of the wear-resistant ring 13 is larger and larger along with the increase, and meanwhile, the opening on the expansion sleeve 40 is expanded along with the increase, namely, the end part of the expansion sleeve 40 provided with the opening is also expanded along with the increase, so that the end surface of the expansion sleeve 40 provided with the opening can be always contacted with the wear-resistant ring 13 without slipping off, the wear-resistant ring 13 can be mounted in place at one time, the phenomenon that the outer diameter of the wear-resistant ring 13 is larger due to the fact that the wear-resistant ring 13 is difficult to contract after being expanded due to repeated mounting is avoided, and the risk of injury to fingers of personnel is also reduced; in addition, the wear-resistant ring 13 slides on the guide sleeve 30 all the time during the installation process, so that the wear-resistant ring does not need to be in contact with the piston body 11, and the piston body 11 is prevented from being scratched and damaged.

When the sealing ring is specifically installed, the guide sleeve 30 is firstly sleeved on the piston body 11, the guide surface 31 is positioned at the tail part of the piston body 11, and the end part of the guide sleeve 30, which is far away from the small-size end of the guide surface 31, is close to the groove 111 of the piston body 11, so that the sealing ring 12 can be easily sleeved on the small-size end of the guide surface 31, and then the sealing ring 12 is pushed to move to the large-size end along the small-size end of the guide surface 31 until the sealing ring falls into the groove 111, and the operation is simple and labor-saving.

In another embodiment of the present application, referring to fig. 5 and 6, the through groove 41 of the piston auxiliary tool provided includes a circular hole section 411 and a straight line section 412 extending along the axial direction of the expansion sleeve 40, one end of the straight line section 412 is communicated with the circular hole section 411, and the other end of the straight line section 412 extends out of the expansion sleeve 40 to form an opening. Specifically, the end of the straight line section 412 is smoothly transited through the circular hole section 411, so that stress concentration when the end of the expansion sleeve 40 is opened can be avoided, damage can be avoided, and the service life of the expansion sleeve 40 can be prolonged.

In another embodiment of the present application, referring to fig. 5 and 6, the circular hole section 411 of the piston auxiliary tool is provided with a diameter larger than the groove width of the straight section 412. The material accumulation of the straight-line section 412 back to the opening is less, the acting force required by opening the opening is small, and the installation operation of an installer is more time-saving and labor-saving.

In another embodiment of the present application, referring to fig. 5 and 6, the number of the through grooves 41 of the piston auxiliary tool is greater than or equal to 2, and the through grooves 41 are uniformly spaced along the circumferential direction of the expansion sleeve 40. Specifically, the more the number of the through grooves 41 is, the easier the expansion sleeve 40 opens along with the guide surface 31, and the more time and labor are saved for the operation of the installer, specifically, the number of the through grooves 41 is 2, 3 or more than 3, and the specific number can be set according to the actual installation requirement, which is not limited herein.

Illustratively, the number of the through slots 41 is 8, the expanding sleeve 40 is processed into an even and symmetrical 8-piece structure, the circular hole section 411 at the bottom of each piece is evenly machined in an indexing manner, and a saw cut is aligned to the center of the circular hole section 411 when the straight line section 412 of each piece is milled, so as to ensure that each piece of the expanding sleeve 40 can be evenly expanded.

In another embodiment of the present application, the edge of the end of the guide sleeve 30, the edge of the end of the guide sleeve, and the edge of the through groove 41 of the piston auxiliary tool are chamfered. The chamfering process removes burrs and sharp portions on the guide sleeve 30 and the expansion sleeve 40, and prevents the surface of the piston body 11, the seal ring 12, and the wear ring 13 from being scratched.

In another embodiment of the present application, the guide sleeve 30 and the expansion sleeve 40 of the piston auxiliary tool are both nylon sleeves; the guide sleeve 30 and the expansion sleeve 40 are both made of nylon, so that the sealing ring 12 and the wear-resisting ring 13 can be prevented from being damaged by deformation and burrs of the port surface of the guide sleeve 30 and the end surface of the expansion sleeve 40.

In another embodiment of the present application, referring to fig. 3 and 4, and referring to fig. 5 and 6, the guide surface 31 of the piston auxiliary tool is provided as a conical surface, and the structure of the guide surface 31 is regular and convenient for processing; illustratively, the conical surface and the cylindrical surface connected with the large-size end of the conical surface jointly form the outer peripheral surface of the guide sleeve 30, and the guide sleeve is regular in structure and convenient to process and manufacture.

In another embodiment of the present application, referring to fig. 3 and 4, a protrusion 44 protruding toward the inside of the guide sleeve 30 is provided on the inner wall of the guide sleeve 30 close to the opening, and the side surface of the protrusion 44 is flush with the end surface of the guide sleeve 30 close to the opening. The protrusion 44 and the end face of the guide sleeve 30 are contacted with the wear-resistant ring 13 together, which is equivalent to increasing the contact area, the probability of the wear-resistant ring 13 slipping off from the expansion sleeve 40 is smaller, the probability of the wear-resistant ring 13 passing through one-time installation is larger, and the installation of the wear-resistant ring 13 is simpler.

In another embodiment of the present application, referring to fig. 5 and 6, an expansion sleeve 40 of the piston auxiliary tool is provided, which includes a first circular plate portion 42 and a first annular wall portion 43 surrounding the first circular plate portion 42, a through slot 41 is opened on the first annular wall portion 43, the opening is located at an end portion of the first annular wall portion 43 opposite to the first circular plate portion 42, and the first circular plate portion 42 is opened with a first vent hole 45; the first annular wall portion 43 is sleeved on the guide sleeve 30, so that in the process of pushing the expansion sleeve 40, a hand can directly act on the first circular plate portion 42, the operation of pushing the wear-resistant ring 13 by the expansion sleeve 40 is more time-saving and labor-saving, in addition, when the expansion sleeve 40 is pushed, air in the first annular wall portion 43 can be discharged through the first vent holes 45, the pushing resistance is reduced, and further, the installation difficulty of the wear-resistant ring 13 is reduced.

Referring to fig. 3 and 4, the guide sleeve 30 includes a second circular plate portion 32 and a second circular wall portion 33 surrounding the second circular plate portion 32, and the second circular plate portion 32 is opened with a second ventilation hole 34. The second annular wall portion 33 is sleeved on the tail portion of the piston body 11, so that in the process of pushing the end portion of the guide sleeve 30 to move to the groove 111, a hand can directly act on the second circular plate portion 32 to push the guide sleeve 30 to move, so that the installation operation of the guide sleeve is more time-saving and labor-saving, in addition, in the process of pushing the guide sleeve 30, air in the second annular wall portion 33 can be discharged through the second vent holes 34, the pushing resistance is reduced, and further, the installation difficulty of the guide sleeve 30 is reduced.

More specifically, the difference between the height of the second annular wall 33 and the distance from the tail end of the piston body 11 to the groove 111 is not large, so that when the second annular wall 33 is sleeved on the piston body 11 in place, the second circular plate 32 directly abuts against the end of the piston body 11, and the end of the second annular wall 33 away from the second circular plate 32 is just near the groove 111, so as to position the guide sleeve 30, and in addition, when the expansion sleeve 40 pushes the wear-resistant ring 13 to move towards the groove 111, the guide sleeve 30 does not move on the piston body 11, so that the guide sleeve 30 does not need to be fixed, only the expansion sleeve 40 needs to be pushed, and the pushing operation is more convenient and labor-saving.

In another embodiment of the present application, referring to fig. 7 and 8, the piston auxiliary tool further includes a pressing sleeve 50 for sleeving the tail portion of the piston body 11 and pressing the wear-resistant ring 13 into the groove 111, and an inner edge of the end of the pressing sleeve 50 is chamfered for guiding the wear-resistant ring 13 into between the groove 111 and the pressing sleeve 50. After the sealing ring 12 and the wear-resistant ring 13 are installed, the guide sleeve 30 and the expansion sleeve 40 are detached, the compression sleeve 50 is sleeved at the tail of the piston body 11, the compression sleeve 50 is pushed to the position of the wear-resistant ring 13, the inner edge of the end of the compression sleeve 50 is chamfered, and in the process of continuously pushing the compression sleeve 50, the wear-resistant ring 13 can be smoothly squeezed into a gap between the groove 111 of the piston body 11 and the compression sleeve 50 along a conical surface obtained by groove processing and is cooled and shrunk and shaped in the gap, so that the piston 10 can be conveniently and smoothly loaded into the subsequent lining 20, and the problem that the wear-resistant ring 13 is difficult to be loaded into the lining 20 due to the expansion caused by heating and even the wear-resistant ring 13 is damaged can be avoided; the pressing sleeve 50 is utilized to forcibly press the wear-resisting ring 13 into the gap between the groove 111 of the piston 10 and the bushing 20, so that the wear-resisting ring 13 is forced to shrink and cool and deform, and the bushing 20 is installed on the basis, thereby saving physical strength and effectively avoiding the damage of the wear-resisting ring 13.

In another embodiment of the present application, the pressing sleeve 50 of the piston auxiliary tool is provided as a nylon pressing sleeve 50. The pressing sleeve 50 is made of nylon, and the wear-resistant ring 13 cannot be damaged by deformation and burrs of the pressing sleeve 50.

In another embodiment of the present application, referring to fig. 7 and 8, a pressing sleeve 50 of the piston auxiliary tool is provided, which includes a third circular plate portion 51 and a third annular wall portion 52 surrounding the third circular plate portion 51, an inner wall of an end portion of the third annular wall portion 52 facing away from the third circular plate portion 51 is beveled, and a third vent hole 53 is formed in the third circular plate portion 51. The third annular wall portion 52 is sleeved on the tail portion of the piston body 11, so that in the process of pushing the end portion of the compressing sleeve 50 to move to the groove 111, a hand can directly act on the third circular plate portion 51 to push the compressing sleeve 50 to move, so that the installation operation of the compressing sleeve is more time-saving and labor-saving, in addition, in the process of pushing the compressing sleeve 50, air in the third annular wall portion 52 can be discharged through the third vent hole 53, the pushing resistance is reduced, and further, the installation difficulty of the compressing sleeve 50 is reduced.

The application also describes the installation steps of the piston 10 in combination with the auxiliary tool for a piston according to the embodiment of the application, and as shown in fig. 9, the following steps are specifically performed:

1. implementation steps of sealing ring installation method

1.1 installing the seal ring 12

Firstly, the guide sleeve 30 is sleeved on the tail part of the piston body 11, the sealing ring 12 is sleeved on the small-size end of the guide surface 31 of the guide sleeve 30, because the guide surface 31 is a gradually-reduced surface, the sealing ring 12 is pushed downwards along the guide surface 31 by hand, the sealing ring 12 is gradually expanded, and finally the sealing ring 12 is arranged in the groove 111 in the middle part of the piston 10.

1.2 installing a wear-resistant ring 13

1.2.1 the wear-resistant ring 13 is made of polytetrafluoroethylene (TFE) material, and has small elasticity, so that the wear-resistant ring is soaked in boiled water for 5min before installation to gradually soften the wear-resistant ring and enhance the variability of volume;

1.2.2 sleeving the wear-resistant ring 13 soaked by boiled water on the small-size end of the guide surface 31 of the guide sleeve 30, and sleeving the expansion sleeve 40 on the small-size end of the guide surface 31 of the guide sleeve 30;

1.2.3 the expansion sleeve 40 is pushed towards the sealing ring direction, and the wear-resistant ring 13 is easily installed in the groove 111 in the middle of the piston 10.

2. Bushing 20 installation

2.1 after the sealing ring 12 and the wear-resisting ring 13 are installed, installing the guide belt 14 on the piston body 11, and completing the installation of the piston 10;

2.2 because the wear-resisting ring 13 is hot-fitted, the volume of the outer ring is increased, the fit clearance between the outer diameter of the wear-resisting ring 13 and the inner diameter of the bushing 20 is small, and the piston 10 is difficult to be fitted into the bushing 20, the pressing sleeve 50 is pushed to the position of the wear-resisting ring 13;

2.3, continuously applying pressure to push the pressing sleeve 50, and chamfering the edge of the end part of the pressing sleeve 50, so that the wear-resistant ring 13 is guided to be squeezed into a gap between the groove 111 of the piston 10 and the pressing sleeve 50;

2.4, the wear-resistant ring 13 is extruded into a gap between the groove 111 of the piston 10 and the pressing sleeve 50 and stands for 0.5 to 1 hour, and the wear-resistant ring 13 is cooled, shrunk and shaped;

2.5, the pressing sleeve 50 is pulled out, the piston 10 is aligned with the opening of the lining 20 again, and the tail part of the piston 10 is slightly pressed, so that the piston 10 can easily enter the lining 20, and the installation of the lining 20 is finished.

Before the wear-resistant ring 13 is installed, the wear-resistant ring is soaked in boiled water for about 5min, so that the wear-resistant ring is softened, the volume of the wear-resistant ring is expanded, and then the wear-resistant ring is installed, so that the installation difficulty is effectively reduced, and the wear-resistant ring 13 is prevented from being damaged.

The application provides a method for installing a sealing ring and a bush 20 of a piston 10, states the difficult point of the installation of the piston 10 and the possible consequences caused by improper installation, introduces a piston auxiliary tool (a guide sleeve 30, an expansion sleeve 40 and a compression sleeve 50), and compares the advantages, effects and influences brought by the original installation method and the installation method. The problems that the installation quality of a sealing ring of the piston 10 and the installation quality of a lining 20 are defective or defective, the piston 10 is jammed and the like in the traditional method are solved, and the problem of rotating speed fluctuation of the steam auxiliary pump is further avoided; aiming at the defects of the traditional installation method of the piston 10 sealing ring and the bush 20, the problems of time and labor waste caused by repeated work are solved.

The piston auxiliary tool provided by the embodiment of the application can not tightly realize the installation of the sealing ring and the bush 20 of the piston 10 of the steam-driven auxiliary feed pump differential pressure regulator in the nuclear power plant, and can also complete the installation of the hard sealing rings of the same type and the same type at the position of a columnar structure.

Compared with the prior art, the piston auxiliary fixtures of the embodiment of the application still have the following advantages:

1. the guide sleeve 30 made of nylon material can avoid damaging the sealing ring due to the deformation and burr of the guide sleeve 30;

2. before the wear-resistant ring 13 is installed, the wear-resistant ring is soaked in boiled water for about 5min, so that the wear-resistant ring is softened, the volume of the wear-resistant ring is expanded, and then the wear-resistant ring is installed, thereby effectively reducing the installation difficulty and avoiding the damage of the wear-resistant ring 13;

3. because of the 8-petal symmetrical equally-divided structure of the expansion sleeve 40, the expansion sleeve 40 keeps contacting with the wear-resistant ring 13 without slipping by utilizing the characteristic that the expansion sleeve 40 expands along with the increase of the outer diameter of the guide surface 31 in the process of pressing down, thereby enabling the wear-resistant ring 13 to be installed in place at one time;

4. the wear-resistant ring 13 is pressed into a gap between the groove 111 of the piston 10 and the pressing sleeve 50 by using the pressing sleeve 50, so that the wear-resistant ring 13 is forced to shrink and cool to deform, and the bushing 20 is installed on the basis, so that the physical strength is saved, and the wear-resistant ring 13 can be effectively prevented from being damaged;

5. the opening end face of the pressing sleeve 50 is subjected to angle chamfering treatment, so that the wear-resistant ring 13 is favorably guided to be extruded into a gap between the groove 111 of the piston 10 and the pressing sleeve 50;

6. the third vent hole 53 on the pressing sleeve 50 is used for exhausting air, so that the pushing resistance of the pressing sleeve 50 is reduced.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. The utility model provides a piston auxiliary fixtures which characterized in that: the method comprises the following steps:

2. The piston auxiliary tool according to claim 1, characterized in that:

the through groove comprises a circular hole section and a straight line section extending along the axis direction of the expansion sleeve, one end of the straight line section is communicated with the circular hole section, and the other end of the straight line section extends out of the expansion sleeve to form the opening.

3. The piston auxiliary tool according to claim 2, characterized in that: the diameter of the circular hole section is larger than the groove width of the straight line section.

4. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that:

the number of the through grooves is more than or equal to 2, and the through grooves are uniformly arranged at intervals along the circumferential direction of the expansion sleeve.

5. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that: the guide sleeve and the expansion sleeve are both nylon sleeves.

6. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that: the guide surface is a conical surface.

7. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that: the inner wall of the guide sleeve, which is close to the opening, is provided with a bulge which protrudes towards the inner part of the guide sleeve, and the side surface of the bulge is flush with the end surface of the guide sleeve, which is close to the opening.

8. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that: the expansion sleeve comprises a first circular plate part and a first annular wall part surrounding the first circular plate part, the through groove is formed in the first annular wall part, the opening is located at the end part, back to the first circular plate part, of the first annular wall part, and a first vent hole is formed in the first circular plate part;

9. The piston auxiliary tool according to any one of claims 1 to 3, characterized in that: the piston auxiliary tool further comprises a pressing sleeve which is used for being sleeved on the tail portion of the piston body and pressing the wear-resistant ring into the groove, and the inner edge of the end portion of the pressing sleeve is subjected to chamfering treatment so as to be used for guiding the wear-resistant ring to enter between the groove and the pressing sleeve.

10. The piston auxiliary tool according to claim 9, characterized in that: the pressing sleeve is a nylon pressing sleeve.