CN215214893U - Online sealing performance measurement sealing plug of small-caliber nuclear-grade check valve - Google Patents
Online sealing performance measurement sealing plug of small-caliber nuclear-grade check valve Download PDFInfo
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- CN215214893U CN215214893U CN202120816885.8U CN202120816885U CN215214893U CN 215214893 U CN215214893 U CN 215214893U CN 202120816885 U CN202120816885 U CN 202120816885U CN 215214893 U CN215214893 U CN 215214893U
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Abstract
The invention relates to the field of machinery, in particular to an online tightness measuring sealing plug for a small-caliber nuclear-grade check valve. For the nuclear-grade small-caliber check valve in the power plant, due to the narrow space (the minimum operating space is only 82mm), the complex sealing plug cannot be effectively installed, and the installation efficiency is low. The invention comprises a screwing nut, a baffle A, a 0-shaped ring, an annular rubber plug and a baffle B; the tightening nut penetrates through the baffle A and the baffle B, the tightening nut is connected with the baffle A, and the baffle B is in threaded connection; the annular rubber plug is positioned between the baffle A and the baffle B; the sealing plug is integrally positioned in the cavity of the valve body. The invention can effectively ensure the sealing performance of the sealing plug, improve the measurement efficiency and reduce the radiation contamination risk of workers, and has the advantages of accurate measurement.
Description
Technical Field
The utility model relates to the field of machinary, concretely relates to online leakproofness of small-bore nuclear level check valve measures sealing plug.
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, its 4 extrusion screw rods or piston design make very difficult when the sealing plug installation, it is more so to the bore check valve that slightly littleer, this 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 nut of unable screwing simultaneously, thereby at the visual extremely poor narrow and small space that can not measure the deflection, unable uniform control circumference rubber seal ring's compressive capacity, lead to the leakproofness of sealing plug to obtain guaranteeing, and then influence the online leakproofness measuring result of check valve at all.
The utility model relates to a technical field is measured to online leakproofness of nuclear level check valve, aims at being used for the export of shutoff check valve, and the online leakproofness of check valve is measured and is established pressure chamber to the end, and to the small-bore check valve of nuclear level of power plant very much, because its space is narrow and small (minimum operating space only 82mm), effective installation can't be accomplished to complicated sealing plug, more need not carry efficiency, the utility model discloses the main design takes tapering rubber sealing plug, solves this technological problem.
Disclosure of Invention
1. The purpose is as follows:
the problem of the existing small-bore check valve sealing plug exist is solved, if install the difficulty or can't install, it is long consuming time, and can't guarantee because of the pipeline is irregular and then influence whole leakproofness measuring result.
2. The technical scheme is as follows:
an online tightness measuring sealing plug for a small-caliber nuclear-grade check valve comprises a tightening nut, a baffle A, a 0-shaped ring, an annular rubber plug and a baffle B; the tightening nut penetrates through the baffle A and the baffle B, the tightening nut is connected with the baffle A, and the baffle B is in threaded connection; the annular rubber plug is positioned between the baffle A and the baffle B; the sealing plug is integrally positioned in the cavity of the valve body.
The excircle diameter of baffle B is less than valve body outlet side diameter, and baffle A's excircle diameter is greater than valve outlet side diameter.
A gap exists between the baffle A and the inner wall of the valve body, the inclination angle of one end of the baffle A is a conical surface inclination angle, and the inclination angle of the inner wall of the valve body is a valve inner cavity inclination angle.
The inclination angle of the conical surface is in clearance fit with the inclination angle of the inner cavity of the valve, and the inclination angle of the conical surface and the inclination angle of the inner cavity of the valve form a conical surface design together.
The top of the tightening nut is in a three-claw shape.
An annular groove is designed in the center hole of the baffle A, and a 0-shaped ring is assembled.
The end face of the annular rubber plug is a wide face.
3. The effect is as follows:
the utility model discloses can effectively guarantee the sealing performance of sealing plug, thereby guarantee the online leakproofness measuring accuracy of check valve, and compare in current sealing plug and the mounting means of difficulty, the exquisite design of this device can be very big shortens installation time, whole installation is steerable within 1 minute (verified through spare part valve), can avoid greatly the unnecessary radiation dose of the maintainer of operation in high dose district, and the very big reduction personnel stain the risk.
Drawings
FIG. 1 shows the sealing plug structure
FIG. 2 top view of the tightening nut
FIG. 3 is a partial enlarged view of the cone design
In the figure: 1. the device comprises a screwing nut, 2, baffle plates A, 3, an O-shaped ring, 4, an annular rubber plug, 5, baffle plates B, 6, a conical surface design, 7, a valve body, 8, a valve inner cavity inclination angle and 9, a conical surface inclination angle.
Detailed Description
As shown in fig. 1, the present sealing plug comprises 5 parts: and screwing the nut 1, the baffle A2, the O-shaped ring 3, the annular rubber plug 4 and the baffle B5.
As shown in fig. 2, the tightening nut 1 is designed to be held by three special claws (angles), so that the tightening nut can be directly screwed by hand without tools, the installation process is greatly simplified, and the operability is high.
As shown in fig. 3, the diameter of the outer circle of the baffle 5 is slightly smaller than the diameter of the outlet side of the valve body 7, the diameter of the outer circle of the baffle 2 is slightly larger than the diameter of the outlet side of the valve, the inclination angle 9 of the conical surface of the baffle a2 is smaller than the inclination angle 8 of the inner cavity of the valve, and the whole circumference design is adopted, so that the sealing plug can be quickly centered and cannot be clamped in the inner cavity of the valve body when being installed, and the sealing plug can be guaranteed to have enough rigidity and cannot be driven into a system due to extrusion deformation in the pressing process.
The device has the following specific use process:
before the check valve tightness measurements are made, the sealing plug is assembled: as shown in fig. 1, the ring rubber stopper 4 is mounted on the stopper B5, the stopper a2 is mounted on the ring rubber stopper 4, and the tightening nut 1 is manually brought to a position just abutting against the stopper a2 but not tightened, so that the ring rubber stopper 4 is free from being deformed by compression. And (4) putting the assembled sealing plug into the outlet side of the check valve, and screwing by hand. The entire assembly process does not exceed 1 minute.
The device is optimized in design in several respects, as shown in figure 1, in comparison to many of the design deficiencies of existing sealing plugs.
(1) For the heavy-calibre check valve, the requirement of small-bore check valve is harsher, and minimum operation size is only 82mm, and this requires the sealing plug size must be small and exquisite, and baffle 2 ingenious utilization check valve pipeline's angle is made, has satisfied self formation leakproofness intensity requirement promptly, can effectively avoid the sealing plug to be driven into the problem of system again.
(2) The screwing nut 1 is specially designed, so that the screwing nut can be conveniently and directly screwed by hands without tools, the installation process is greatly simplified, and the operability is high.
(3) An annular groove is designed in the center hole of the baffle A2, and an O-shaped ring is assembled to axially seal the baffle A2.
(4) The excircle diameter of baffle B5 slightly is less than valve body 7 outlet side diameter, and the excircle diameter of baffle A2 slightly is greater than valve outlet side diameter, and baffle A2 conical surface inclination 9 is less than valve inner chamber inclination 8, and whole week design can be fast centering and can not block in the valve body inner chamber when making the installation sealing plug, and also can guarantee that the sealing plug has enough rigidity and can not be thrown into the system because of extrusion deformation in the process of suppressing.
(5) Annular rubber buffer 4 and baffle A2, baffle B5 contact sealed face's conical surface design 6 for baffle A2, baffle B5 and annular rubber buffer 4 can automatic centering in the installation, and baffle B5's baffle, central screw rod integrated design have guaranteed the rubber stopper by the manual even distribution of the circumferential expansion deflection of screwing up nut 1 of screwing down.
(6) The end face of the annular rubber plug 4 is designed into a wide face, labyrinth seal can be formed after extrusion, original defects such as pits and poor roundness of a pipeline can be overcome, and effective seal is formed.
The embodiments of the present invention have been described in detail, but the above description is only the best embodiment 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 small-bore nuclear level check valve which characterized in that: comprises a screwing nut (1), a baffle A (2), a 0-shaped ring (3), an annular rubber plug (4) and a baffle B (5); the screwing nut (1) penetrates through the baffle A (2) and the baffle B (5), the screwing nut (1) is connected with the baffle A (2), and the baffle B (5) is in threaded connection; the annular rubber plug (4) is positioned between the baffle A (2) and the baffle B (5); the whole sealing plug is positioned in the cavity of the valve body (7).
2. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: the excircle diameter of baffle B (5) is less than valve body (7) outlet side diameter, and the excircle diameter of baffle A (2) is greater than valve outlet side diameter.
3. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: a gap exists between the baffle A (2) and the inner wall of the valve body (7), the inclination angle of one end of the baffle A (2) is a conical surface inclination angle (9), and the inclination angle of the inner wall of the valve body (7) is a valve inner cavity inclination angle (8).
4. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 3, wherein: the conical surface inclination angle (9) is in clearance fit with the valve inner cavity inclination angle (8), and the conical surface inclination angle (9) and the valve inner cavity inclination angle (8) jointly form a conical surface design (6).
5. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: the top of the tightening nut (1) is in a three-claw shape.
6. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: an annular groove is designed in the center hole of the baffle A (2) and is provided with a 0-shaped ring (3).
7. The small-bore nuclear-grade check valve online tightness measuring sealing plug of claim 1, wherein: the end surface of the annular rubber plug (4) is a wide surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120816885.8U CN215214893U (en) | 2021-04-21 | 2021-04-21 | Online sealing performance measurement sealing plug of small-caliber nuclear-grade check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120816885.8U CN215214893U (en) | 2021-04-21 | 2021-04-21 | Online sealing performance measurement sealing plug of small-caliber nuclear-grade check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215214893U true CN215214893U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120816885.8U Active CN215214893U (en) | 2021-04-21 | 2021-04-21 | Online sealing performance measurement sealing plug of small-caliber nuclear-grade check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215214893U (en) |
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2021
- 2021-04-21 CN CN202120816885.8U patent/CN215214893U/en active Active
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