CN110967148A

CN110967148A - Cavity plugging tool

Info

Publication number: CN110967148A
Application number: CN201911130745.9A
Authority: CN
Inventors: 张春华; 袁仲欣; 刘赟奕; 李莹
Original assignee: AECC Shenyang Liming Aero Engine Co Ltd
Current assignee: AECC Shenyang Liming Aero Engine Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-04-07

Abstract

The invention discloses a cavity blocking tool, which comprises: the device comprises an adjusting bolt, a sealing ring I, a plug, a sealing ring II and a hexagon nut; one side of the head of the adjusting bolt is arranged in a unthreaded hole to be blocked, and a plurality of sealing rings I for radially sealing the unthreaded hole are arranged between a screw rod on one side of the head of the adjusting bolt and the unthreaded hole; the end cap is a T-shaped part with a boss at the tail end, a through hole is formed in the center of the end cap, the end cap is sleeved outside a screw rod of the adjusting bolt, a sealing ring II used for sealing the end face of the unthreaded hole is arranged between the boss of the end cap and the end part of the unthreaded hole, and the hexagonal nut is in threaded connection with the adjusting bolt and tightly pressed on the boss of the end cap. The invention has simple manufacture, flexible use, simplicity and easy operation, and successfully realizes one-time assembly to achieve the effect of sealing the semi-closed cavity.

Description

Cavity plugging tool

Technical Field

The invention relates to sealing of a pressure test of a casting case cavity of an aero-engine, in particular to a cavity blocking tool, which is particularly suitable for parts needing porous sealing.

Background

The guide vane inner ring belongs to an annular porous casting structural part with a semi-closed inner cavity (as shown in figures 1-3), the internal defect of the semi-closed inner cavity is difficult to detect without damage, and the internal quality of the casting is difficult to detect comprehensively and accurately. Therefore, the design requires that the semi-closed inner cavity is tested for sealing performance by using kerosene, and the internal metallurgical quality of the casting is detected. In order to meet the kerosene pressurizing test conditions, 35 unthreaded holes communicated with the semi-closed inner cavity of the part need to be sealed. The existing special tool is adopted (as shown in figure 2): plugs with end face sealing rubber rings, which have the same size as the unthreaded holes, are plugged into the unthreaded holes, and the 35 plugs are tightly propped against the 35 plugs by means of 35 screws assembled on the annular iron disc, so that the unthreaded holes at 35 positions are sealed. The method has the following disadvantages: because the guide vane inner ring is a casting part, the aperture tolerance of 35 unthreaded holes distributed on the circumference of the guide vane inner ring is within the range of 0.5mm, and the angular position tolerance of the guide vane inner ring is within the range of 1mm, when the plug is tightly pushed by the screw rod, the effective acting area is reduced, the stress is not on the center of the plug, kerosene can leak from the 35 unthreaded holes in different degrees in the pressing process, the plug with the end face sealing rubber ring cannot completely seal the semi-closed inner cavity, an operator is required to continuously adjust the position of the screw rod on the annular iron disc, and the sealing can be met only after repeated assembly for many times.

Therefore, the tool which meets the requirements of a semi-closed cavity of a casting casing and ensures the one-time assembly of the porous sealing is a pending requirement.

Disclosure of Invention

The invention aims to provide a cavity blocking tool, which can effectively solve the problems.

The technical scheme of the invention is as follows: the utility model provides a shutoff cavity frock, includes: the device comprises an adjusting bolt 1, a sealing ring I2, a plug 3, a sealing ring II 4 and a hexagon nut 5; one side of the head of the adjusting bolt 1 is arranged in a unthreaded hole to be blocked, and a plurality of sealing rings I2 for radially sealing the unthreaded hole are arranged between a screw rod on one side of the head of the adjusting bolt 1 and the unthreaded hole; the end cap 3 is a T-shaped part with a boss at the tail end, a through hole is formed in the center of the end cap 3, the end cap 3 is sleeved outside a screw rod of the adjusting bolt 1, a sealing ring II 4 used for sealing the end face of the unthreaded hole is arranged between the boss of the end cap 3 and the end part of the unthreaded hole, and the hexagonal nut 5 is in threaded connection with the adjusting bolt 1 and tightly pressed on the boss of the end cap 3.

Preferably, the number of the sealing rings I2 is 1-3.

Aiming at the characteristics that the circumferential position tolerance of a plurality of holes to be blocked of a cast component and the tolerance of the holes are large and the holes are difficult to seal, the invention adopts the technical scheme that the radial seal and the end face seal are sealed in multiple ways and the force can be independently applied to the sealing plug. The radial seal can assemble a plurality of rubber rings according to the actual size of each section of the aperture in the depth direction of the aperture, and the defect of large tolerance of the cast aperture is made up by using the embedding amount of the rubber rings, so that each aperture can meet the sealing effect; and the multi-hole is respectively sealed and applied with force by the scheme of threaded connection and nut force limitation, the scheme replaces the method of tightly propping the plugs one by using the screws on the heavy annular iron disc, and the defects that the circumferential position tolerance of the cast unthreaded hole is large, the screw cannot completely act on the plug, and kerosene leaks from the gap of the end face of the plug are overcome.

The invention has the following beneficial effects:

the invention has simple manufacture, flexible use, simplicity and easy operation, and successfully realizes one-time assembly to achieve the effect of sealing the semi-closed cavity. The sealing test requirement of the semi-closed cavity of the casting structure is met, the problem that a plurality of holes with large position tolerance and large aperture tolerance are difficult to seal is effectively solved, the assembly manufacturability of the sealing device is greatly improved, the operation difficulty is reduced, and the production efficiency is improved by 87.5%. The sealing device has the advantages of simple structure, convenient operation and low manufacturing cost, and 1 set of tool saves about 8 ten thousand yuan.

Drawings

FIG. 1 is a schematic view of a cast structural member;

FIG. 2 is a schematic view of FIG. 1 with A rotated 90 counterclockwise;

FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2;

FIG. 4 is a schematic structural diagram of a conventional dedicated tooling;

FIG. 5 is a schematic view of the annular iron disk of FIG. 4;

FIG. 6 is a schematic structural view of the present invention;

FIG. 7 is a schematic illustration of the present invention in use;

in the figure: 1. adjusting the bolt; 2. a sealing ring I; 3. a plug; 4. a sealing ring II; 5. a hexagonal nut.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

As shown in fig. 6 and 7, a cavity blocking tool includes: the device comprises an adjusting bolt 1, a sealing ring I2, a plug 3, a sealing ring II 4 and a hexagon nut 5; one side of the head of the adjusting bolt 1 is arranged in a unthreaded hole to be blocked, and a plurality of sealing rings I2 for radially sealing the unthreaded hole are arranged between a screw rod on one side of the head of the adjusting bolt 1 and the unthreaded hole; the plug 3 is the T-shaped piece of end area boss, and the plug 3 center is equipped with the through-hole, and the screw rod outside of adjusting bolt 1 is located to plug 3 cover, is equipped with between the boss of plug 3 and the unthreaded hole tip to be used for carrying out end face seal's sealing washer II 4 to the unthreaded hole, and hexagon nut 5 compresses tightly in the boss of plug 3 with 1 threaded connection of adjusting bolt.

When in use, the concrete operation steps are as follows:

the method comprises the following steps: the surface A of the adjusting bolt 1 firstly enters the unthreaded hole to be blocked, and the size of the surface A is 0.1mm smaller than the minimum nominal size of the diameter of the unthreaded hole, so that the surface A can smoothly enter the unthreaded hole.

Step two: the O-shaped rubber sealing ring I2 for the hydraulic air is selected, a standard part is selected, the embedding amount is 0.6mm according to calculation, the aperture tolerance of 0.5mm of the cross section of different depths of the unthreaded hole can be compensated, and the radial sealing effect of the unthreaded hole is achieved.

The method for determining the number of the assembled sealing rings I2 comprises the following steps: measure unthreaded hole diameter before the assembly, if hole entry diameter is big, the depths diameter is little, optional 2 ~ 3 of sealing washer I2 quantity, otherwise, 1 of sealing washer I2 quantity can.

Step three: the plug 3 and the O-shaped rubber sealing ring II 4 for hydraulic air jointly play a role in plugging the unthreaded hole on the end face.

The surface B of the plug 3 is the same as the surface A of the adjusting bolt 1 in size and also needs to enter a unthreaded hole to be plugged, and the threaded surface of the adjusting bolt 1 penetrates through an inner hole D of the plug 3; the C department of end cap 3 can not be with chamfer or radius mode switching, smoothly gets rid of sharp limit, can guarantee to increase when sealing washer II 4 quantity rather than area of contact, can avoid sealing washer I2 again by sharp limit fish tail.

And a standard part is selected for the sealing ring II 4, the compression amount of the standard part is 1.8mm, the aperture tolerance of 0.5mm of the unthreaded hole can be compensated, and the end face sealing effect of the unthreaded hole is achieved.

Step four: after the threads (penetrating through an inner hole D of the plug 3) of the hexagon nut 5 and the adjusting bolt 1 are screwed, the end face of the hexagon nut 5 is pressed on the end face of the plug 3, a moment is applied to the hexagon nut 5, the radial sealing and the end face sealing of the O-shaped rubber sealing ring I2 and the sealing ring II 4 play a role, meanwhile, the hexagon nut 5 plays a role in jacking, a method for jacking the plug by using a screw rod on a heavy annular iron disc is replaced, and the defects that the circumferential position tolerance of a cast unthreaded hole is large, the screw rod cannot completely act on the plug, and kerosene leaks from the end face gap of the plug are overcome.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a shutoff cavity frock which characterized in that includes: the device comprises an adjusting bolt (1), a sealing ring I (2), a plug (3), a sealing ring II (4) and a hexagon nut (5); one side of the head of the adjusting bolt (1) is arranged in a unthreaded hole to be blocked, and a plurality of sealing rings I (2) for radially sealing the unthreaded hole are arranged between a screw rod on one side of the head of the adjusting bolt (1) and the unthreaded hole; the end cap (3) is a T-shaped part with a boss at the tail end, a through hole is formed in the center of the end cap (3), the end cap (3) is sleeved outside a screw rod of the adjusting bolt (1), a sealing ring II (4) used for sealing the end face of the unthreaded hole is arranged between the boss of the end cap (3) and the end portion of the unthreaded hole, and the hexagonal nut (5) is in threaded connection with the adjusting bolt (1) and is pressed on the boss of the end cap (3).

2. The cavity blocking tool according to claim 1, wherein the number of the sealing rings I (2) is 1-3.