JP4690902B2 - jig - Google Patents

Description

  The present invention relates to a jig, and more particularly, to a jig capable of facilitating positioning of a tail cylinder in a gas turbine combustor assembly process.

  In the assembly process of the gas turbine combustor, a jig is used for positioning (centering) the inner cylinder and the tail cylinder. A conventional jig 100 includes a dial gauge 101, a rotating portion 102 to which the dial gauge 101 is attached, a rod 103 fixed to the rotating portion 102, and a support portion 104 that supports the rod 103 (see FIG. 8).

  In positioning of the transition piece, the dial gauge 101 and the rotating part 102 are inserted into the entrance part of the temporarily installed transition piece, and the support part 104 is attached to the mounting part of the passenger compartment (the top hat for holding the inner cylinder). And the jig 101 is fixed. At this time, the rotating part 102 and the inner cylinder are concentric. Then, by rotating the rotating unit 102, the dial gauge 101 is rotated in the circumferential direction of the transition piece, and the numerical value of the dial gauge 101 at each position in the circumferential direction is measured. Then, based on the measurement result, the position of the tail cylinder is finely adjusted so that the numerical value of the dial gauge 101 substantially matches at each position in the circumferential direction of the tail cylinder. Thereby, the transition piece is positioned and fixed at an appropriate position.

  In addition, the patent document regarding the jig | tool for performing the positioning of a tail cylinder is not yet released.

  An object of this invention is to provide the jig | tool which can facilitate the positioning operation | work of a transition piece in the assembly process of a gas turbine combustor.

  In order to achieve the above object, a jig according to the present invention is a jig for positioning an inner cylinder of a combustor and a tail cylinder of a combustor when the combustor of a gas turbine is assembled. It has an outer peripheral shape along the inner peripheral shape of the cylinder, and has a centering portion that is inserted into the tail cylinder and defines the installation position of the tail cylinder when the tail cylinder is positioned.

  In this jig, the centering portion that defines the installation position of the tail tube has an outer peripheral shape that follows the inner peripheral shape of the tail tube, so that the centering portion is inserted into the tail tube when positioning the tail tube. Thus, the position of the transition piece with respect to the centering portion is easily measured. Thereby, there exists an advantage by which the positioning operation | work of a transition piece is made easy.

  Moreover, the jig | tool concerning this invention has the outer diameter of the said centering part smaller than the internal diameter of the said tail cylinder.

  With this jig, the centering portion can be inserted into the tail tube even when the plurality of tail tubes have individual differences (inside diameter variations). Thereby, there exists an advantage which can position each tail cylinder appropriately with a single jig | tool.

  In the jig according to the present invention, a hole or a hole is made in the centering portion, and the centering portion is reduced in weight.

  With this jig, bending of the jig (rod) due to the weight of the centering portion is reduced when the jig is installed. Thereby, since the position accuracy of the centering portion is improved, there is an advantage that the measurement error at the time of positioning of the transition piece is reduced.

  In the jig according to the present invention, when the inlet portion of the transition piece has a circular inner peripheral shape, the centering portion has a circular outer peripheral shape.

  In this jig, since the centering part has a circular outer peripheral shape, when the centering part is inserted into the tail tube, the positional relationship between the centering part and the tail tube is easily grasped by the operator's visual observation. The Thereby, there exists an advantage by which the positioning operation | work of a transition piece becomes easier.

  In the jig according to the present invention, the centering portion has an outer peripheral shape capable of measuring at least four points when positioning the tail cylinder.

  Since this jig secures at least four measurement points, there is an advantage that the installation position of the transition piece can be measured within a necessary and sufficient range.

  In the jig according to the present invention, since the centering portion that defines the installation position of the tail tube has an outer peripheral shape along the inner peripheral shape of the tail tube, the centering portion is inserted into the tail tube when positioning the tail tube. By doing so, the position of the transition piece with respect to the centering portion is easily measured. Thereby, there exists an advantage by which the positioning operation | work of a transition piece is made easy.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. The constituent elements of this embodiment include those that can be easily replaced by those skilled in the art or those that are substantially the same. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

  1 and 2 are a side view (FIG. 1) and a front view (FIG. 2) showing a transition piece centering jig according to an embodiment of the present invention. 3 to 5 are a flowchart (FIG. 3) and an explanatory diagram (FIGS. 4 and 5) showing a method of using the transition piece centering jig shown in FIG. 1. 6 and 7 are explanatory views showing modifications of the transition piece centering jig shown in FIG. FIG. 8 is a side view showing a conventional transition piece centering jig.

  The combustor of the gas turbine has an inner cylinder and a tail cylinder (not shown). The inner cylinder is attached to the passenger compartment through an intermediate member called a top hat. A fuel nozzle and a burner are inserted and installed in this inner cylinder. The transition piece is disposed downstream of the inner cylinder and connected to the turbine blade row. In this combustor, the fuel injected from the fuel nozzle and the compressed air supplied from the compressor are premixed in the inner cylinder and ignited by the burner. The generated combustion gas is supplied to the turbine cascade through the tail cylinder.

  Here, in the assembly process of the combustor, a jig 1 for positioning (centering) the inner cylinder and the tail cylinder is used (see FIGS. 1 and 2). The jig 1 has a centering part 2, a rod 3, and a support part 4. The centering portion 2 has an outer peripheral shape along the inner peripheral shape of the inlet portion (combustion gas inlet portion) of the tail tube, and is inserted into the tail tube when positioning the tail tube so that the tail tube is properly installed. Define the location. For example, in this embodiment, since the inlet portion of the transition piece has a circular inner peripheral shape, the centering portion 2 has a disk shape with high roundness. The centering portion 2 is made of stainless steel and is lightened by a plurality of holes 21. The rod 3 is fixed to the center of the centering portion 2 at its tip end while standing in the longitudinal direction perpendicular to the plane of the centering portion 2. The support part 4 supports the rod 3 in a fixed state, and is bolted and fixed to the attachment part of the passenger compartment 11 when positioning the tail cylinder. Thereby, the centering part 2 is fixed to a predetermined position via the rod 3 and the support part 4. In addition, the attachment part of the compartment 11 is a seat to which a top hat (not shown) for holding the inner cylinder is attached.

  In the combustor 10, the positioning operation of the transition piece 12 is performed as follows (see FIGS. 3 to 5). First, the transition piece 12 is temporarily installed in the passenger compartment 11 (ST1). The transition piece 12 is held by the support 20 at the inlet, and is connected and fixed to a turbine blade row (not shown) at the outlet. The support 20 is fixedly installed in the passenger compartment 11. Next, the jig 1 is carried in and installed (ST2). The jig 1 is inserted into the entrance portion of the temporarily installed tail tube 12 and the centering portion 2 is inserted into the mounting portion of the passenger compartment by the support portion 4 and fixed. At this time, the centering part 2 is arrange | positioned in the position which becomes concentric with respect to the inner cylinder (and top hat) when it is installed in the passenger compartment. Thereby, the centering part 2 defines the proper installation position of the tail cylinder (position concentric with the inner cylinder).

  Next, the installation position of the transition piece 12 is measured (ST3). In the measurement of the installation position, a taper gauge is used, and a gap t between the inner periphery of the transition piece 12 and the outer periphery of the centering portion 2 is measured (see FIG. 5). This measurement is performed at a total of four points at intervals of about 90 [deg] in the circumferential direction of the transition piece 12. Based on the measurement result, the installation position of the transition piece 12 is determined (ST4). In the determination of the installation position, it is determined that the installation position of the transition piece 12 is appropriate if the measured values at the four points substantially coincide. Specifically, it is determined to be appropriate if the difference between the measured values (gap t) is within a predetermined allowable assembly tolerance. In this embodiment, a predetermined allowable assembly tolerance is set within a range of 1 [mm] with respect to the diameter of the transition piece 12. Therefore, the gap t between the transition piece 12 and the centering portion 2 can be easily measured with a taper gauge.

  Here, if the measured values at the four points do not substantially match in the determination of the installation position of the transition piece 12, the installation position of the transition piece 12 is adjusted (ST5). Specifically, the torque of the support 20 that fixes the tail cylinder 12 is loosened, and the position of the tail cylinder 12 is finely adjusted by the visual observation of the operator. On the other hand, when the installation position of the transition piece 12 is appropriate, the torque of the support 20 is tightened and the transition piece 12 is permanently installed (ST6). Thereafter, the jig 1 is removed and removed (ST7), and the inner cylinder (and the top hat) is inserted and installed in the passenger compartment 11 (ST8).

  As described above, in the jig 1, the centering portion 2 that defines the installation position of the transition piece 12 has an outer peripheral shape that follows the inner peripheral shape of the transition piece 12. By inserting the centering portion 2 into the position 12, the position of the transition piece 12 with respect to the centering portion 2 is easily measured. Thereby, there exists an advantage by which the positioning operation | work of the transition piece 12 is made easy.

  For example, in the above configuration, when determining whether the installation position of the transition piece 12 is appropriate, the gap t between the inner periphery of the transition piece 12 and the outer periphery of the centering portion 2 can be measured using a taper gauge. Therefore, the workability at the time of measurement is improved as compared with a conventional jig that performs measurement using a dial gauge. Moreover, since the centering part 2 is integrated with the jig 1 main body (having an integral structure), the jig 1 is installed in comparison with a conventional jig that requires a dial gauge to be attached and detached. Work is facilitated. By these, the construction period of the assembly process of the combustor 10 can be shortened.

  Moreover, since there is no possibility that the dial gauge falls into the transition piece 12 as in the conventional jig, breakage of the transition piece is prevented. Further, as described above, since measurement with a taper gauge is possible, reading errors of the gauge pointer due to distortion of the tail cylinder 12 are unlikely to occur, and measurement errors are small. As a result, the transition piece 12 is properly installed, and the reliability of the gas turbine is improved (quality is ensured).

  Further, in the jig 1, it is preferable that the outer diameter of the centering portion 2 is formed slightly smaller than the inner diameter of the tail tube 12 (see FIG. 5). Specifically, the inner diameter of the centering portion 2 is defined to be small so that the gap t between the outer diameter of the centering portion 2 and the inner diameter of the transition piece 12 is within a range that can be measured with a taper gauge. In such a configuration, the centering portion 2 can be inserted into the transition piece 12 even when the plurality of transition pieces 12 have individual differences (inside diameter variations). Thereby, there exists an advantage which can position each tail cylinder 12 appropriately with the single jig | tool 1. FIG.

  Moreover, in this jig | tool 1, it is preferable that the centering part 2 is lightened by making a hole or a hole in the centering part 2 (refer FIG. 2). For example, the centering part 2 is reduced in weight by opening the plurality of holes 21 symmetrically with respect to the center of the centering part 2. In such a configuration, the bending of the rod 3 due to the weight of the centering portion 2 is reduced when the jig 1 is installed. Thereby, since the position accuracy of the centering part 2 improves, there exists an advantage by which the measurement error at the time of positioning of the transition piece 12 is reduced.

  Further, in this jig 1, when the inlet portion of the transition piece 12 has a circular inner peripheral shape, the centering portion 2 preferably has a circular (and continuous) outer peripheral shape (see FIG. 2). For example, it is preferable that the centering portion 2 has a substantially circular disc shape (see FIG. 2) or a substantially perfect circular shape (see FIG. 6). In such a configuration, since the centering portion 2 has a circular outer peripheral shape, the positional relationship between the centering portion 2 and the tail tube 12 is visually determined by an operator when the centering portion 2 is inserted into the tail tube 12. Easily grasped. Specifically, by comparing the positional relationship between the inner peripheral line (circular shape) of the transition piece 12 and the outer peripheral line (circular shape) of the centering portion 2, the positional deviation of the transition piece 12 can be grasped at a glance. Thereby, there exists an advantage from which the positioning operation | work of the transition piece 12 becomes easier.

  Moreover, it is preferable that the centering part 2 of the jig 1 has an outer peripheral shape capable of measuring at least four points when measuring the position of the transition piece. Therefore, for example, the centering part 2 may have a cross shape or the like (see FIG. 7). In such a configuration, since at least four measurement points are secured, there is an advantage that the installation position of the transition piece 12 can be measured within a necessary and sufficient range (measurement of four points). For example, even when the centering portion 2 has a triangular shape, the installation position of the tail tube is theoretically measured. However, in such a configuration, the measurement accuracy is lowered, so it is preferable to secure at least four measurement points as described above.

  As described above, the jig according to the present invention is useful in that the positioning operation of the transition piece can be facilitated in the assembly process of the gas turbine combustor.

It is a side view which shows the tail cylinder centering jig concerning the Example of this invention. It is a front view which shows the tail tube centering jig concerning the Example of this invention. It is a flowchart which shows the usage method of the tail cylinder centering jig described in FIG. It is explanatory drawing which shows the usage method of the tail cylinder centering jig described in FIG. It is explanatory drawing which shows the usage method of the tail cylinder centering jig described in FIG. It is explanatory drawing which shows the modification of the transition tube centering jig described in FIG. It is explanatory drawing which shows the modification of the transition tube centering jig described in FIG. It is a side view which shows the conventional tail cylinder centering jig.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jig 2 Centering part 21 Hole 3 Rod 4 Support part 10 Combustor 11 Car compartment 12 Tail 20 Support

Claims (5)

A jig for positioning the inner cylinder of the combustor and the tail cylinder of the combustor during assembly of the combustor of the gas turbine,
It has an outer peripheral shape along the inner peripheral shape of the transition piece, and has a centering portion that is inserted into the transition piece and defines the installation position of the transition piece when the transition piece is positioned. jig.   The jig according to claim 1, wherein an outer diameter of the centering portion is smaller than an inner diameter of the tail tube.   The jig according to claim 1 or 2, wherein a hole or a hole is made in the centering portion to reduce the weight of the centering portion.   The jig according to any one of claims 1 to 3, wherein the centering portion has a circular outer peripheral shape when the inlet portion of the transition piece has a circular inner peripheral shape.   The jig according to any one of claims 1 to 4, wherein the centering portion has an outer peripheral shape capable of measuring at least four points when positioning the tail cylinder.

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