RU206615U1 - DEVICE FOR MOUNTING AND DISMANTLING OF ATTACHED EQUIPMENT OF A GAS TURBINE ENGINE - Google Patents

Abstract

The utility model refers to devices used in the gas industry, in particular when replacing attachments (for example, an electric starter or a centrifuge) during the current repair of a gas turbine engine (hereinafter referred to as GTE). and dismantling the GTE attachments. The technical result is the implementation of the possibility of angular adjustment of the GTE attachments during its installation in the conditions of the compressor station. The problem is solved, and the technical result is achieved by creating and using a device consisting of a scissor mechanism with the possibility of lifting the rail with lateral extension a retractable console built into it with rotary bearings attached to it, in which, by means of T-shaped slots, lodgments are built in, allowing for angular rotation of the equipment attached to them.

Description

The utility model refers to devices used in the gas industry, in particular, when replacing attachments (for example, an electric starter or centrifuge) during the current repair of a gas turbine engine (hereinafter referred to as GTE).

The GTE includes a starting device (pneumatic or electric starter), which is designed to spin up the high pressure rotor during hot start or cold cranking.

During the operation of the gas turbine engine, it is periodically necessary to replace the electric starter due to its failure or the development of an overhaul life. Dismantling and installation of the electric starter in the conditions of the compressor station (hereinafter referred to as the CS) is carried out manually, without the use of mechanized devices.

The disadvantages of the existing method of mounting and dismounting the electric starter are

injury due to the large weight of the electric starter (over 60 kg) and the presence of a large number of protruding parts (air and oil piping, attachments of the engine oil supply system, drive boxes);

labor costs due to the tightness of the working space within the noise-insulating casing (hereinafter referred to as the KShT), leading to the impossibility of simultaneously finding a sufficient number of workers in the KShT to carry out operations related to the installation and dismantling of the electric starter, as well as the inaccessibility of the electric starter attachment elements to the GTE drive box.

The disadvantages listed above significantly affect the number of man-hours spent required to replace the electric starter and, ultimately, increase the time required to prepare the gas compressor unit (hereinafter referred to as the GPU) for start-up.

From open sources there is information about the existence of a device based on a scissor lifting mechanism and designed for lifting and subsequent lateral movement of the lifted load [1].

The disadvantages of the existing device [1] are

lack of structural elements that allow for angular adjustment of the lifted load, in this case, an electric starter.

To carry out mechanized installation (dismantling) in the device design, it is necessary to provide for the possibility of angular adjustment due to the fact that the electric starter can be installed in only one specific angular position in which:

the pin on the electric starter will align with the mating hole on the docking connector of the drive box;

the splines of the drive spring (transmitting torque from the electric starter to the input shaft of the GTE drive box) will coincide with the mating splines on the input shaft of the GTE drive box.

Therefore, to dock the electric starter with the GTE drive box, it is not enough just concentric alignment of the connectors, but you also need the possibility of angular adjustment to the position at which the pin on the electric starter coincides with the mating hole on the drive box, and the splines of the output spring will coincide with the input shaft splines on the drive box ...

The task of the utility model is to reduce labor costs and injury risk during operations related to the installation and dismantling of GTE attachments.

The technical result is the implementation of the possibility of angular adjustment of the attachments of the gas turbine engine during its installation in the conditions of the compressor station.

The task is solved, and the technical result is achieved by creating and using a device consisting of a scissor mechanism with the ability to lift the guide with lateral extension of the built-in retractable console with rotary bearings attached to it, into which the lodgments are built in by means of T-shaped slots, allowing to carry out angular rotation of the equipment attached to them.

The claimed device for mounting and dismounting of equipment is explained using:

fig. 1 is an isometric general view of the device in working condition with a fixed electric starter (1);

fig. 2 is a two-dimensional general view of the device in working condition of the docking of the electric starter (1) fixed on the cradle (13) with the drive box (25) by means of the fastening elements (23). The base (6) is rigidly fixed with fasteners to the embedded elements (24). The electric starter (1) in the state of installation is suspended in a cantilever manner above the load-bearing element of the KShT frame (27).

fig. 3 is an isometric general view of the device from the service side in a state prepared for operation (folded) with a base (6) fixed to the embedded elements (not shown). The electric starter (1) is laid on the cradle (13) and secured with clamps (12).

fig. 4 is an isometric general view of the device from the side of the mounting connector in a state prepared for operation (folded) with a base (6) fixed to the embedded elements (not shown). The electric starter (1) is laid on the cradle (13) and secured with clamps (12).

The design of the device consists of the following elements: carrying handles (2), thrust bearing (3), scissor mechanism (4), arm supports (5), base (6), linear guides (7), trapezoidal screw (8), running nut (9), support bearing (10), lock nut (11), clamps (12), cradles (13), rotary bearings (14), extendable console (15), arm supports (16), travel nut (17), trapezoidal screw (18), lifting guide (19), support bearing (20), linear bearings (21) and liners (30) included in their design, thrust bearing (22).

The principle of operation of the device (in the case of installing an electric starter to the engine) is as follows:

When the trapezoidal screw (8) rotates, secured against displacement in the axial and radial direction by the thrust bearing (22) and the support bearing (10), the travel nut (9) and the linear bearings (21) rigidly fixed to it move, which in turn leads to a change in the angles of the levers of the scissor mechanism (4) and, as a consequence, to the lifting of the lifting guide (19), as well as the electric starter fixed to it through a series of intermediate elements (1). When the required lifting height of the starter (1) is reached, the position of the scissor levers (4) is fixed with a lock nut (11).

The design of linear bearings (21) excludes all types of movement, except for reciprocating movement relative to the longitudinal axis of the linear guides (7).

The design of linear bearings (21) includes antifriction bushings (30) that provide a low coefficient of friction on steel for linear guides (7).

Further, due to rotation, a trapezoidal screw (18) rigidly fixed by means of a support bearing (20) and a thrust bearing (3), the travel nut (17) is displaced along the axis of the trapezoidal screw (18) and the extension rigidly fixed to the travel nut (17 ) of the retractable console (15), which is fixed in the lifting guide (19) through a movable T-shaped connection.

After extending the extendable console (15) and concentric alignment of the electric starter connectors (1) and the drive box (25) by applying manual force to the portable handles (2), the electric starter position is angularly adjusted until the pin (28) on the electric starter is aligned with the mating hole on the drive box (25), and the splines of the output spring (29) with the splines of the input shaft on the gearbox (25).

The procedure for using the device (when installing an electric starter to the engine) is as follows.

The device is installed with the base (6) on the embedded elements (24), then the base (6) is rigidly fixed to the embedded elements (24) by means of fasteners, an electric starter (1) is placed on the cradle (13) and rigidly fixed with clamps (12). Next, the electric starter (1), fixed with clamps (12) and cradles (13), with attached rotary bearings (14), is installed on the retractable console (15). The retractable console (15) and rotary bearings (14) are connected using a rectangular pin-shaped element with rounded ends (which is a structural element of rotary bearings (14)) and a mating groove of a similar shape in the retractable console (15).

To exclude damage to the paintwork, elastic rubber (or fluoroplastic) elements (26) are included in the design of the clamps (12) and lodgements (13).

Using the key, the trapezoidal screw (8) hooked into the slots, the lifting guide (19) is lifted to the desired height and the position of the scissor levers (4) is fixed using the lock nut (11). The lock nut (11) has a thread opposite to the screw (8), thereby excluding the possibility of self-loosening and uncontrolled lowering of the electric starter (1).

Using a key hooked into the slots of the trapezoidal screw (18), extend the extendable console (15) together with the starter (1) attached to it until the concentric connection of the electric starter docking connector (1) with the mating connector on the drive box (25) and manually using portable handles (2) carry out the angular adjustment of the electric starter (1) to the desired angular position. Next, by rotating the trapezoidal screw (18), the retractable console (15) is extended together with the starter (1) attached to it until the surfaces of the connectors of the electric starter (1) and the drive box (25) are mated, after which the fastening elements (23) are installed.

Further, the fixation of the lock nut (11) is loosened and by lowering the lifting guide (19) using the trapezoidal screw (8), the pin-shaped element of the rotary bearing (14) and the mating groove on the retractable console (15) are removed from the connection. Then, by rotating the trapezoidal screw (18), the sliding console (15) is returned to its original position relative to the lifting guide (19). Then, the lifting guide (19) is lowered to the initial position of the scissor arms (4).

Next, he dismantles the clamps (12), cradles (13) from the electric starter (1) and dismantles the base (6) from the embedded elements (24).

The essential distinguishing features of the claimed device for the installation and dismantling of equipment are:

- simplicity of construction, due to the use of standard elements (screws, nuts, fasteners, bearings, linear guides);

- the device has small mass-dimensional characteristics, which implies ease of transportation and use.

Provided that modifications are made to the design of the lodgements (13) and clamps (12), this device can be used for mounting and dismounting of GTE attachments, the installation of which requires lifting and angular adjustment when docked to the drive box. Such devices include starting devices with electric or pneumatic drives, centrifuges installed on various types of gas turbine engines.

The claimed essential distinguishing features are unknown to us from patent and scientific and technical information and, in accordance with this, are "New".

For the claimed device, working drawings, strength calculations were made and a prototype was made, which was successfully tested when replacing the STE-18ST-361-1 electric starter at the compressor shop No. 6 of the Mikunsky LPUMG of Gazprom Transgaz Ukhta LLC. In this regard, the device declared by us meets the criterion "Industrial applicability".

The claimed device for mounting and dismounting of equipment allows for the mechanized replacement of the STE-18ST-361-1 electric starter with a gas turbine engine of the NK-36ST type. The device is easy to transport, quick to install and easy to use.

List of sources:

1. Patent US 10399511 B2, IPC B66F 7/06 03.09.2019.

Claims (1)

A device for mounting and dismounting equipment, consisting of a scissor mechanism with the possibility of lifting the guide with lateral extension of the sliding console built into it, characterized in that rotary bearings are attached to the sliding console, into which, by means of T-shaped slots, there are built-in cradles allowing for angular rotation the equipment attached to them.

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