CN215861889U - Online sealing performance measurement sealing plug of large-diameter nuclear-grade check valve - Google Patents

Abstract

The utility model belongs to the field of machinery, and particularly relates to an online tightness measuring sealing plug suitable for a large-caliber nuclear-grade check valve. For the nuclear grade large-diameter check valve of the power plant, due to the fact that the sealing area is large, thrust generated during pressing can enable the sealing plug to be driven into the system and cannot be sealed due to displacement deformation. In the utility model, the rubber plug is positioned between the baffle A and the baffle B; the tightening studs sequentially penetrate through the positioning plate, the baffle A and the baffle B and are in threaded connection with the baffle B; the outer diameters of the baffle A and the baffle B are in clearance fit with the inner diameter of the outlet of the check valve. The utility model can greatly shorten the installation time, make up for the influence of defects such as roundness and pits of large-size valve pipelines, greatly avoid unnecessary radiation dose of maintainers operating in high-dose areas and greatly reduce the contamination risk of the staff.

Description

Online sealing performance measurement sealing plug of large-diameter nuclear-grade check valve

Technical Field

The utility model belongs to the field of machinery, and particularly relates to an online tightness measuring sealing plug suitable for a large-caliber nuclear-grade check valve.

Background

After the nuclear grade check valve of the nuclear power plant is overhauled, the tightness can only be measured on line after the check valve is overhauled, and a sealing chamber needs to be established, namely, the outlet of the check valve is blocked. To a part nuclear power plant's a return circuit nuclear level check valve, there is higher radiation dose behind the opening, and this just needs check valve sealing plug design small and exquisite, and the quick installation of easy access personnel, and characteristics such as the leakproofness is strong, and can never be in the system of being squeezed into at the in-process that steps up.

At present, due to design defects, user experience is not ideal for check valve sealing plugs existing in the market, so that the application is very limited. For example, the 4 extrusion screws or the piston type design of the large-caliber check valve makes the installation of the sealing plug very difficult, the large-caliber check valve is greatly influenced by the roundness, and no sealing plug capable of making up the large deviation exists at present; in addition, because the similar piston O type circle formula structure of heavy-calibre, this is great makes the maintainer difficulty when the installation sealing plug very big, the operability is extremely poor, and greatly increased the unnecessary radiation dose that receives under the maintainer opening operation, and stain the risk, on the other hand, because 4 screwing up nuts can't be screwed simultaneously, thereby in the visual narrow and small space of extremely poor and unmeasurable deflection, can not evenly control the compression volume of circumference rubber seal ring, lead to the leakproofness of sealing plug can't obtain guaranteeing, and then influence the online leakproofness measuring result of check valve at all.

The utility model relates to the technical field of online tightness measurement of nuclear-grade check valves, and aims to be used for plugging an outlet of a check valve and establishing a pressure chamber for online tightness measurement of the check valve.

Disclosure of Invention

1. The purpose is as follows:

the utility model aims to solve the problems that the existing check valve sealing plug is difficult to install and time-consuming, the sealing performance of the existing check valve sealing plug cannot be guaranteed if the roundness deviation of a pipeline is large, and the sealing performance measurement result is influenced.

2. The technical scheme is as follows:

a sealing plug for online tightness measurement of a large-caliber nuclear-grade check valve is disclosed, wherein a rubber plug is positioned between a baffle A and a baffle B; the tightening studs sequentially penetrate through the positioning plate, the baffle A and the baffle B and are in threaded connection with the baffle B; the outer diameters of the baffle A and the baffle B are in clearance fit with the inner diameter of the outlet of the check valve.

An annular groove is arranged in the central hole of the baffle A, and an O-shaped ring is placed in the annular groove.

And one side of the baffle B is provided with an exhaust hole.

The positioning sleeve is inserted into the hollow round hole part of the positioning plate.

The right end of the positioning sleeve is designed as a boss and is inserted into the annular groove at the left end of the baffle A, and the outer edge of the positioning sleeve is contacted with the left end face of the baffle A.

The left end of the positioning sleeve is screwed into a positioning sleeve nut and a gasket, and the gasket is tightly attached to the left end face of the positioning plate.

The top end of the tightening stud is fixedly provided with a tightening nut, and the positioning sleeve nut is screwed at the outer end of the tightening stud.

3. The effect is as follows:

the utility model can effectively ensure the sealing performance of the sealing plug, thereby ensuring the accuracy of the on-line sealing performance measurement of the check valve, and compared with the existing sealing plug and the difficult installation mode thereof, the exquisite design of the utility model can greatly shorten the installation time, make up the defects of roundness, pits and the like of a large-size valve pipeline, greatly avoid the unnecessary radiation dose of maintainers operating in a high-dose area, and greatly reduce the contamination risk of the staff.

Drawings

FIG. 1 sealing plug installation and construction intent

FIG. 2 is a schematic view of a positioning plate

FIG. 3 baffle 2 schematic view

FIG. 4 baffle 3 schematic

FIG. 5 schematic view of tightening stud 4

FIG. 6 is a schematic view of the positioning sleeve 8

In the figure: 1. the positioning plate comprises a positioning plate body 2, a baffle plate A, a baffle plate B, a bolt screwing device 5, a nut screwing device 6, a positioning sleeve nut 7, a gasket 8, a positioning sleeve 9, an O-shaped ring 10 and a rubber plug.

Detailed Description

The structural form is as follows:

as shown in fig. 1, the present sealing plug comprises 5 parts: the device comprises a positioning plate 1, a baffle A2, a baffle B3, a tightening stud 4, a tightening nut 5, a positioning sleeve nut 6, a gasket 7, a positioning sleeve 8, an O-shaped ring 9 and a rubber plug 10.

As shown in fig. 2, the positioning plate 1 plays a role in limiting circumferential displacement of the outlet of the sealing plug, and prevents the sealing plug from being driven into the system in the boosting process.

As shown in fig. 3, an annular groove is arranged in the central hole of the baffle plate a2, the O-ring 9 is placed in the annular groove, the tightening screw 4 and the baffle plate 2 are sealed, and the sealing plug can seal the outlet of the check valve by matching with the circumferential seal formed by extruding and expanding the rubber plug.

As shown in fig. 4 and 5, a central threaded hole of the baffle plate B3 is in threaded fit with one end of the tightening stud 4; one side of the plate surface is provided with an air vent which is used for exhausting air when the baffle A2 and the baffle B3 squeeze the rubber plug. The outer diameters of baffle a2 and baffle B3 are slightly smaller than the inner diameter of the check valve outlet to reach into the outlet conduit.

As shown in fig. 6, the positioning sleeve 8 passes through the positioning plate 1, the right end of the positioning sleeve 8 is designed as a boss, and is inserted into the O-ring groove at the left end of the baffle a2, and the outer edge of the boss is in contact with the left end face of the baffle 2.

The locating sleeve nut 6 and the gasket 7 are screwed at the left end of the locating sleeve 8, after the locating sleeve nut and the gasket 7 are screwed, the gasket 7 is tightly attached to the left end face of the locating plate 1, the deformation of the O-shaped ring 9 can be adjusted by adjusting the locating sleeve nut, the sealing force is further controlled, and the larger the pretightening force is, the larger the sealing force of the O-shaped ring is.

The tightening nut 5 is screwed on the tightening stud 4, the deformation of the baffle plates 2 and 3 for extruding the rubber plug 10 is controlled by controlling the pretightening force of the tightening nut, and the sealing force of the rubber plug is further controlled. The larger the pretightening force is, the larger the circumferential sealing force of the rubber plug is. Is designed to be specially designed and used for the purpose of,

the specific operation process of the utility model is as follows:

before the tightness of the check valve is measured, the sealing plug is assembled as shown in fig. 1 with the tightening nut 5 but without tightening, and the rubber ring 10 is free and not deformed by compression. And (3) putting the assembled sealing plug into the outlet side of the check valve, screwing the positioning sleeve nut 6, and screwing the nut 5.

Compared with a plurality of design defects of the existing sealing plug in the market, the utility model has the following technical innovation points:

(1) the design of locating plate 1, make in the installation, the sealing plug can firmly be fixed at the valve export, can not have the risk of being squeezed into the system along with pressure rising.

(2) The sealing force of the sealing plug is determined by the positioning sleeve nut 6 and the tightening nut 5 together, namely: the rubber stopper 10 is extruded by the baffle plates 2 and 3 to deform, the circumferential sealing force generated by the inner wall of the valve outlet and the sealing force generated by the sealing ring 9 extruded by the positioning sleeve 8 and the baffle plate 2 are determined by the two. The axes of the positioning sleeve nut 6 and the tightening nut 5 coincide with the axis of the sealing plug, so that the extrusion deformation of the O-shaped ring 9 and the rubber plug 10 subjected to the pre-tightening pressure is uniformly distributed in the circumferential direction, the sealing plug is convenient to automatically center and align in the pre-tightening process, and the uncontrollable sealing force factor caused by the fact that the existing sealing plug is difficult to install and easy to deflect is avoided, so that the sealing force of the sealing plug and the efficient installation speed are greatly guaranteed.

(3) The end face of the annular rubber plug is designed into a wide face, labyrinth seal can be formed after extrusion, the original defects of poor roundness of a pit and a pipeline and the like can be overcome, effective seal is formed, and the method is more optimal for a large-caliber valve.

(4) The whole axial clearance is controlled by the positioning sleeve 8, and the bushings with different sizes can adapt to valves with different forms, and meanwhile, the whole sealing plug is guaranteed not to axially move, and the sealing performance is damaged.

The embodiments of the present invention have been described in detail, but the above description is only the best embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.

Claims (7)

1. The utility model provides a sealing plug is measured to online leakproofness of heavy-calibre nuclear level check valve which characterized in that: the rubber plug (10) is positioned between the baffle A (2) and the baffle B (3); the tightening stud (4) sequentially penetrates through the positioning plate (1), the baffle A (2) and the baffle B (3), and the tightening stud (4) is in threaded connection with the baffle B (3); the outer diameters of the baffle A (2) and the baffle B (3) are in clearance fit with the inner diameter of the outlet of the check valve.

2. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: an annular groove is arranged in the central hole of the baffle A (2), and an O-shaped ring (9) is placed in the annular groove.

3. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: one side of the baffle B (3) is provided with an exhaust hole.

4. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: the positioning plate (1) is characterized in that a hollow round hole part is inserted into a positioning sleeve (8).

5. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 4, wherein: the right end of the positioning sleeve (8) is designed as a boss and is inserted into the annular groove at the left end of the baffle A (2), and the outer edge of the positioning sleeve is contacted with the left end face of the baffle A (2).

6. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 5, wherein: the left end of the positioning sleeve (8) is screwed into a positioning sleeve nut (6) and a gasket (7), and the gasket (7) is tightly attached to the left end face of the positioning plate (1).

7. The large-caliber nuclear-grade check valve online tightness measuring sealing plug of claim 6, wherein: the top end of the tightening stud (4) is fixedly provided with a tightening nut (5), and the positioning sleeve (8) is screwed at the outer end of the tightening stud (4).

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