RU146432U1 - TOOL FOR CLEANING DAMAGES ON WORKING BLADES OF A COMPRESSOR FOR A GAS TURBINE ENGINE - Google Patents

Abstract

A tool for cleaning damage on the working blades of a compressor of a gas turbine engine (GTE) belongs to the field of mechanical engineering and can be used in the maintenance of GTE in operation. The tool includes in its design elements designed to perform cleaning operations, and is also adapted for the possibility of introducing into it a device or elements of a visual control system for the cleaning process. 1 n.s.p. f-ly, 4 ill.

Description

Known devices for cleaning damage on the working blades of a compressor of a gas turbine engine (GTE), including a structure inserted into the internal cavity of a gas turbine engine together with a processing element (milling cutter, boron), a system for installing and securing the processing element in preliminary and working positions, a mechanical drive system for the processing element and a visual control system for the process of cleaning damage on the blades.

A description of such devices (analogues) is given in patents: RU 6711 U1, US 5475485, US 7097539 B2. The disadvantage of these devices is the inability to perform cleansing of nicks in some places of the blade pen, for example at the end of the pen, as well as the inability to perform important technological operations, for example, to form the profile of the blade or to bring the surface clean.

Typically, in such cases, similar devices (tools) are used that have a translational-reciprocal movement of the processing element (cutter, file, abrasive) and are driven manually. A description of the use of such a tool is given in the “Technical Operation Guide” of the domestic aircraft engine PS-90A1, 194-00-800RE, part 2, Service Technology, book 1, section PSA1-A-72-34-00-00R-660A-A , TC Cleaning during operation of damage to the working blades of the HPC, pages 1 ÷ 78. A similar description of the use of such a tool is given in the operational documentation of the PS-90A engine, Bulletin No. 94399-BD-G dated 05/25/2006 - “Cleaning the damage to compressor blades ...”

In the aggregate of essential features that match the features of the claimed utility model, this tool is adopted as a prototype. The disadvantage of the prototype should include the lack in its design of a visual control system for the stripping process of nicks and, more importantly, the inability to use the visual inspection device together with a stripping tool, as a result of which it is necessary to remove the stripping tool from the engine and insert it instead visual engine into the engine - an endoscope or a video camera. It is such a technology of work performance that is spelled out in the technological maps of the aforementioned RTE 194-00-800 RE.

The technical problem to which the claimed utility model of the stripping tool is aimed is to ensure the possibility of stripping damages (nicks) on the working blades of the GTE compressor and performing visual inspection of the stripping process without having to remove the stripping tool from the engine and introduce a device instead of it ( system) of visual inspection, that is, in providing the ability to perform visual inspection simultaneously with a cleaning tool located in the engine.

As a result of solving the above-stated problem, the process of performing damage stripping becomes quickly controlled, labor costs are reduced when performing cleaning operations, the time it takes to complete work, and simple equipment.

The essence of the claimed utility model lies in the fact that the known tool for cleaning damage to the rotor blades of a GTE compressor, consisting of a holder made in the form of a tube with a tip welded to one of the ends, a processing element pivotally attached to the tip of the holder, a clamp of the processing element made in in the form of a single assembly of a tube and a threaded sleeve worn on a holder and having the possibility of longitudinal movement along the holder, a rotating handle mounted on the other end the holder and the thread connecting with the threaded sleeve of the retainer, moving the retainer along the holder and fixing the processing element in the working position at an angle to the longitudinal axis of the holder, made structurally adapted for the possibility of introducing and placing the device (or system elements) in it of visual control and also providing the opportunity observation of the processed blade, which makes it possible to carry out visual control of the process of stripping nicks (damage) without removing the tool for stripping from the internal cavity of the gas turbine engine, in order to place the visual inspection device, the internal space of the tool holder is used, which is free from structural elements that interfere with the insertion and placement of the visual control device inside the holder, in order to be able to observe the damage being smoothed in the walls of the holder and fixative in the zone near the place of attachment to the holder of the processing element, a window is made that is azimuthally oriented towards the location of the processing element element and communicating the external space of the location of the scapula with the internal space of the holder, in which the lens of the endoscope or camera is placed.

The essence of the claimed utility model is illustrated by drawings, which depict:

in FIG. 1 is a general view (in section) of a tool for cleaning damage on the working blades of a gas turbine compressor with a processing element (cutter) in the working position and with a visual inspection device introduced into the tool - an endoscope, the tool is located inside the cavity of the gas turbine compressor;

in FIG. 2 is a longitudinal section through the hinge of the processing element to the stripping tool;

in FIG. 3 is a cross-sectional view of a stripping tool located inside the cavity of a gas turbine compressor; the relative position of the tool, the processing element and the blades of the gas turbine compressor is shown during stripping;

in FIG. 4 is a longitudinal section of a part of a stripping tool with the elements of a visual control system introduced into it in the form of a television camera with backlight.

The tool includes (see Fig. 1) a holder 2 made in the form of a pipe with a free inlet 1 from one end and a tip 7 welded to the other end. A groove 23 is made in the tip (Fig. 2), into which the machining element 9, the processing element is hinged to the two posts 24 of the tip by the axis 8. In the middle part of the holder 2, in its tubular wall, a longitudinal groove 15 is made. The tool includes a clamp 6, which consists of a tubular part and a threaded sleeve welded to it and 5, from the opposite side sleeve in the tubular wall of the fixture, two diametrically opposite longitudinal grooves 25 are made up to the depth of line BB, along which the fixture contacts the processing element 9 when it is locked in the working position (at an angle to the longitudinal axis of the tool).

In the assembled state, the latch 6 is located outside the holder 2 and has the possibility of longitudinal movement along it within the length of the groove 15, which includes the end of the screw 16, screwed into the threaded sleeve 5, due to this connection, the rotary movement of the latch relative to the holder is limited.

The tool also includes a rotating handle 3 mounted on the holder at the end with the hole 1, with the possibility of rotational movement relative to the holder, but limited in longitudinal movement along it by bushings 12 and 14, mounted on the holder, while the mounting screws 13 and screw 16 do not enter deep into the internal cavity of the holder and do not interfere with the possibility of introducing an endoscope 10. The rotating handle 3, with its internal thread, is connected to the threaded sleeve 5 of the lock, so that when the handle 3 is rotated, the lock 6 move the unit on the holder 2.

In the immediate vicinity of the hinged attachment of the processing element to the holder in the walls of the holder and the latch, a window 19 is made, facing the location of the processing element, while the window 19, made in the latch, comes into a combined position (in the longitudinal direction) with the window 19 made in the holder, with the working position of the processing element. To the contour of the window 19 in the latch does not block the contour of the window 19 in the holder, the window in the latch can be made large.

A tool for cleaning damage on the compressor blades is used as follows.

The required machining element 9 is installed in the tool, the axis 8 is inserted, the latch 6 is lowered by rotation of the handle 3 to the position at which the latch walls close the axis 8 from falling out. Put the fuse 4 in the working position, in which it limits the ability of the latch 6 to rise above the axis 8 to prevent uncontrolled loss of the axis 8 from the holes of the tip and spontaneous disconnection of the articulated joint of the processing element with the holder. The processing element 9 is in an unsecured longitudinal position (shown in dotted lines in FIG. 1) —the preliminary position.

The tool is introduced into the compressor housing 18 through the operating hatch 17, then the processing element is installed in the working position 9 (at an angle to the axis of the tool) and fixed in this position using the rotary handle 3, while the clamp 6 presses the processing element 9 along line B -B to the axis 8 and to the racks of the tip 7.

Next, check the correct positioning of the processing element 9 relative to the blades of the guide apparatus 20 and the working blade 21 to be cleaned, for which it is possible to introduce an endoscope 10 (Fig. 1) or a television camera 27 (Fig. 4) attached together with the light source 28 to the holder 26. Bring the lens of the control device to the window 19, perform the control in the required volume, remove the visual control device from the tool, while using protective (shock-absorbing and fixing) elements Options 11 (FIG. 1).

Subsequent operations are related to the cleaning operations and visual inspection, for which a visual control device is introduced (and displayed).

Claims (1)

A tool for cleaning damage to the working blades of a compressor of a gas turbine engine, comprising a holder made in the form of a tube with a tip at one of the ends, a processing element pivotally attached to the tip of the holder, a clamp of the processing element made in the form of a single unit of a tube and a threaded sleeve worn on the holder and having the possibility of longitudinal movement along the holder, a rotating handle mounted on the other end of the holder, made with the possibility of connecting the threads with threads howling sleeve of the said clamp and moving the clamp along the holder and fixing the processing element in the working position at an angle to the axis of the holder, characterized in that the internal space of the holder is configured to insert and remove a visual control device in the form of an endoscope or video camera, while in the tubular walls of the holder and the said latch next to the place of attachment to the tip holder there is a window oriented towards the location of the processing element in the working position and providing visual inspection capabilities.

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