Stationary blade ring throat width measuring device

Abstract

The throat width measuring device for the stationary blade ring comprises a handle, a throat width measuring ball and a fixed-height pin, the throat width measuring ball is fixed at the end part of the handle, and the fixed-height pin is vertical to the handle and is also fixed at the end part of the throat width measuring ball. The end part of the high pin is a shaft rod with a step, and the diameter of the shaft rod is smaller than that of the fixed-height pin; a shaft hole matched with the shaft rod is formed in the corresponding position of the throat width measuring ball. The gauge is simple in structure and convenient to manufacture and use, the height fixing pin is convenient to disassemble and assemble, a series of gauges can be prepared, throat width measurement is carried out at the pitch circle position in go and stop ball detection, and the measurement accuracy is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stationary blade ring throat width measuring device. BACKGROUND

[0002] The diaphragm part in the stator of the steam turbine, including the gas turbine engine, the cyclone and other components, belongs to the stationary blade ring (the stationary blade ring includes the blades fixed uniformly between the outer ring and the inner ring), the earlier part is welded into the assembly through the welding mode after the blade is processed in place separately, and the rest parts are milled, and the consistency of the channel between the welding deformation blade types is poor. The traditional detection method is to draw the diameter line of the pitch circle, and then the existing stop gauge is used to detect the throat width according to the pitch circle line part, because the adjacent blade type accumulation axis angle extends outward, so the channel throat width between the adjacent blade types is from small to large, and the throat width is also from small to large accordingly, so the line detection method can cause the detection result to exist deviation due to human factors; the existing stop gauge is used for traditional throat width measurement, including the handle and the throat width measuring ball installed on the handle, because the upper and lower positions of the measuring tool are not calibrated, the upper and lower positions are estimated manually to detect; if the detection position is not correct, the size is not easy to measure accurately.

[0003] At present, the processing of the stationary blade ring diaphragm develops towards the whole milling direction, and the throat width can be controlled through the equipment process from the precision of the equipment and the maturity of the process, but the throat width still has the measurement requirement, so the improved measuring device is needed to detect the size of the throat width in time, and the detection position needs to be accurate to detect.

[0004] The utility model optimizes the traditional detection from the actual processing process, and designs the convenient and accurate measuring device. INVENTION CONTENTS

[0005] The utility model aims at providing a new stationary blade ring throat width measuring device.

[0006] The technical scheme of the utility model is a stationary blade ring throat width measuring device, characterized in that the stationary blade ring throat width measuring device comprises a handle 2-1, a throat width measuring ball 2-3 and a fixed-height pin 2-2; the throat width measuring ball 2-3 is fixed at the end of the handle 2-1, and the fixed-height pin is perpendicular to the handle 2-1 and is also fixed at the end of the throat width measuring ball 2-3.

[0007] Further, the fixed-height pin is provided with a series of lengths for different lengths of blades.

[0008] The end of the fixed-height pin is a shaft rod provided with a step, and the diameter of the shaft rod is smaller than the diameter of the fixed-height pin; the corresponding position of the throat width measuring ball is provided with a shaft hole matched with the shaft rod.

[0009] The fixed-height pin is supported at the outer ring of the stationary blade ring to ensure that the through and stop balls detect the throat width measuring tool at the pitch circle, and the accuracy of measurement is ensured.

[0010] Beneficial effects: compared with the prior art, the utility model has the advantages of simple structure, convenient manufacturing and use, convenient disassembly and assembly of the fixed height pin, preparation into a series of gauges, guarantee of throat width measurement at the pitch circle (detection at the pitch circle when the fixed height pin is supported on the surface of the outer ring) and high measurement accuracy, timely detection of the throat width size on the machine table even if the overall milling direction develops, and convenient use of the utility model.

[0011] The throat width of the blade is the highest precision requirement when the blades are installed, and the measurement accuracy is extremely important, and after being fixed, the quality of the workpiece can be guaranteed, and the position precision of the hole of the welded static vane ring structure directly affects the installation angle of the blade, and when the blade installation deviates, the thermal efficiency of the entire gas turbine will be affected. Due to the problems of a large angle of the installation hole of the cyclone blade and high position precision requirement, an ordinary machine tool cannot directly process the blade installation hole, and a high-precision five-axis machine tool needs to be used for processing, and the equipment and labor costs are high. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of the utility model device;

[0013] Figure 2 It is a schematic view when the utility model is measured.

[0014] Figure 3 It is a structure schematic view of a static vane ring of a steam turbine;

[0015] Figure 4 It is a top view schematic view when the utility model is measured after the blade is unfolded. DETAILED DESCRIPTION

[0016] As shown in the figure, the handle 2-1, the throat width measuring ball 2-3 and the fixed height pin 2-2. The throat width measuring device of the static vane ring of the steam turbine adopted in the embodiment, the fixed height pin measurement schematic view: the throat width requirement at the pitch circle φ550 is 7.25±0.1, the inner flow channel φ500. The distance from the pitch circle to the inner flow channel is 25mm. The height from the center of the through and stop throat width measuring ball to the bottom of the fixed height pin is designed as 25mm, and the through and stop ball detection at the pitch circle φ550 is guaranteed through the fixed height pin; the handle 2-1, the fixed height pin 2-2, the through gauge measuring ball of the throat width measuring ball 2-3 is φ7.326(+0.008 / 0), the wear limit is 7.35; the stop gauge measuring ball is φ7.15(+0.008 / 0).

[0017] The throat width measuring ball and the fixed height pin adopt CrWMn material, the handle adopts stainless steel and is accurately prepared through fine machining, the fixed height pin is provided with a series of lengths for different lengths of blades, and the throat width measuring ball 2-3 can also be provided with different diameters, so that the throat width of any static vane ring can be measured.

[0018] The throat width measuring device 2 comprises a throat width 3, a blade 4 and a handle, the face end of the handle being a handle, and the handle can be embossed.

[0019] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than that of the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0020] The above examples are designed in the form of equal-radius sections, but the flow channel structure of the stator vane ring is not limited to this, and the following are two other common structures, and this method is applicable to both.

[0021] 1) Closed stator vane ring, the inner and outer flow channels are curved, and this structure needs to consider two aspects for designing the throat width measuring device. One is where the minimum throat width is; and two is that after determining the minimum throat width, what distance should the center of the measuring ball to the flow channel surface be.

[0022] For such a structure, the coordinates of the minimum throat width can be calculated directly at the pitch circle by UG or other three-dimensional software; and the height of the center of the measuring ball to the bottom of the positioning pin can also be calculated.

[0023] 2) Measurement of open (without inner ring) stator vane ring, when the present application measures, there is no inner ring flow channel, the fixed distance pin can be designed according to the outer flow channel, and the curvature influence of the outer flow channel needs to be considered when designing, and the bottom of the positioning pin can be designed as a spherical type to reduce the influence of the curvature interference of the outer flow channel.

[0024] 3) For some design requirements that need to detect the actual measured value of each throat width of the whole circle, the actual measured value can be measured by passing the gauge and the plug.

[0025] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and the present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the width of a stationary blade annular throat, characterized in that, It includes a handle, a throat width measuring ball, and a height fixing pin; the throat width measuring ball is fixed to the end of the handle, and the height fixing pin is perpendicular to the handle and also fixed to the end of the throat width measuring ball; the end of the height fixing pin is a stepped shaft with a diameter smaller than that of the height fixing pin; the throat width measuring ball has a corresponding shaft hole that matches the shaft.

2. The stationary blade annular throat width measuring device according to claim 1, characterized in that, The height-fixed pins are available in a series of lengths.

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