CN2469413Y - Internal diameter measuring scale in steam turbine gland clearance measuring device - Google Patents

Abstract

The inner diameter measuring ruler in the steam turbine steam seal clearance measuring device has a circular ruler seat that can be clamped on a false shaft, a radial fixed arm is connected to the circular ruler seat by a thread, a movable arm that can slide on the fixed arm is connected to the fixed arm, and a dial indicator is provided between the fixed arm and the movable arm. When the movable arm is moved to measure the steam turbine steam seal clearance, the arm length and the reading of the dial indicator can indicate the size of the steam turbine steam seal clearance. When the utility model is used to measure the steam turbine steam seal clearance, its shape and structure are suitable for use at the measurement site. The measurement operation is simple and the use is convenient. It can be used as a special inner diameter measuring ruler in the steam turbine steam seal clearance measuring device.

Description

Measuring ruler for internal diameter in steam turbine seal clearance measuring device

The utility model relates to an inner diameter measuring ruler in a steam seal clearance measuring device of a steam turbine, in particular to a structure of an inner diameter measuring ruler in a steam turbine seal clearance measuring device.

When overhauling steam turbines in thermal power plants, it is necessary to measure the seal clearance. In the prior art, the measurement is carried out by means of an inner diameter micrometer relying on a dummy shaft as the reference point of the shaft center. Due to the structure of the steam turbine and the special shape of the position to be measured, it is very inconvenient to use this ruler for measurement. In the prior art, there is no internal diameter measuring ruler specially used for measuring the steam seal clearance of the steam turbine.

The purpose of this utility model is in order to overcome above-mentioned deficiency, proposes a kind of measuring ruler of inner diameter in the steam seal clearance measuring device of steam turbine that is convenient to measure.

The utility model is realized by following method.

The invention scheme of the present utility model is: the internal diameter measuring ruler in the steam turbine steam seal gap measuring device has a circular ruler seat that can be clamped on the false shaft, and the circular ruler seat is connected with a radial fixed arm with threads, and the fixed arm is connected with a radial fixed arm. There is a movable arm that can slide axially along the fixed arm, and there is a dial gauge between the fixed arm and the movable arm. When the movable arm is slid to measure the steam seal clearance of the steam turbine, the reading of the arm length and the dial gauge can indicate the steam seal of the steam turbine. The size of the gap.

In order to realize the above-mentioned invention scheme, the internal diameter measuring ruler in the steam turbine seal clearance measuring device has a clip-type circular ruler seat, and the radial ruler arm is connected with a thread on the cassette-type circular ruler seat, and the radial ruler arm has a double-rod fixed ruler arm. , the double-rod fixed ruler arm is connected with a single-rod movable ruler arm that can slide axially along the double-rod fixed ruler arm. The ruler base has an axial snap ring, the axial snap ring is covered with a circumferential snap ring, there is an axial slit on the circumference of the axial snap ring, there are clamping bolts at the slit, and there are protrusions at both ends of the axial snap ring The edge ring, the circumferential snap ring has two semi-circular rings, one end of the two semi-circular rings is spliced, and the other end has clamping bolts, and the circumferential snap ring is clamped between the raised edge rings at both ends of the axial snap ring , after the axial snap ring is clamped on the dummy shaft, the snap ring ruler seat can be positioned at the measuring point on the dummy shaft, the circumferential snap ring can be rotated on the axial snap ring, and the The clamping bolt can adjust the degree of tightness between the circumferential snap ring and the axial snap ring. There is a radial screw rod on the outer circumference of the circumferential snap ring; the double-rod fixed ruler arm has two parallel fixed arm rods. One end of the inner side of the parallel fixed arm has a ruler arm seat, and the ruler arm seat has an internal thread hole matched with the radial screw rod on the outer circumference of the circumferential snap ring, the axis of the internal thread hole is parallel to the fixed arm rod, There is a cylindrical spring box at the outer end of the two parallel fixed arm bars. The axis of the cylindrical spring box is parallel to the fixed arm bar. There is a through hole at the axis of the cylindrical spring box. There is a dial indicator and a distance sensor on the mounting frame, the measuring rod of the dial indicator is parallel to the fixed arm, the contact of the measuring rod of the dial indicator faces the inner end of the fixed arm, and there is a through hole in the middle of the mounting frame , the axis of the through hole is parallel to the fixed arm; the single-rod movable ruler arm has a movable arm, the inner side of the movable arm is connected with a movable guide plate, and there are two round holes on the movable guide plate, and the double-rod fixed ruler arm Two fixed arm rods pass through the two round holes of the movable guide plate, the contact of the measuring rod of the above-mentioned dial indicator is in contact with the surface of the movable guide plate, and the movable arm rod passes through the through hole in the middle of the bearing frame and the axis of the spring box The movable arm can be extended and retracted along the axial direction of the fixed arm to slide. The movable arm has a fixed bracket on a section inside the spring box, and the fixed bracket is connected to the bottom of the spring box. There is a coil spring in between, and the coil spring makes the movable arm rod receive the force of extension. The movable arm rod has a radial handle in the section of the support frame, and the handle extends out of the support frame. There is a movable arm rod extension on the support frame. There are two handle positions for extension and retraction. The axial distance between the two positions on the ruler arm is equal to the distance measuring range of the dial indicator. Toggle the handle between the two positions to make the movable arm extend and retract , the range of extension and retraction is within the distance measuring range of the dial indicator. The movable arm is usually in the retracted gear. The movable arm has a flat end joint at the outer end of the spring box, and the flat end joint has a joint with Two discs that are vertical and coaxial to the active arm, one disc is connected to the end of the active arm on the outside of the spring box, the other disc has a short shaft head on the axis, and there is an axial internal thread hole on the short shaft head. The two discs are connected together with a live joint. Before the two discs are tightly connected together with a live joint, the two discs can rotate relative to each other along the axis. The internal threaded hole on the short shaft head can be connected with an axial screw at one end and the other at the other end. A movable arm extension with an axial internal thread hole at one end or a measuring contact with an axial screw at one end and a cylindrical contact at the other end, the measuring contact can also be connected to the movable arm extension.

When in use, put the card-type circular ruler seat on the dummy shaft of the steam turbine, slide it to the gap of the steam seal to be tested, tighten the clamping bolts of the axial snap ring, and adjust the circumferential snap ring on the axial snap ring. For the clamping bolt of the ring, screw the inner threaded hole of the ruler arm seat at the inner side of the ruler arm on the radial screw rod on the outer circumference of the circumferential snap ring, first measure the inner diameter of the measured part, and use the method of increasing or decreasing the lengthening rod Let the difference between the initially measured inner diameter minus the length of the ruler arm be within the range of the centimeter, turn the ruler arm to the place to be measured, use the handle on the movable arm to change the gear position, and let the spring force make the movable arm Stretch out, the cylindrical contact at the outer end of the measuring contact is against the inner wall of the measured place, at this time the measuring rod contact of the dial indicator that is in contact with the movable guide plate at the inner end of the movable arm is touched, and the dial indicator The reading is the extended length of the movable arm, and the inner diameter of the measured place is the length of the ruler arm when the movable arm is retracted plus the reading on the dial indicator above. When increasing or decreasing the length of the long rod, the axial direction of the cylindrical surface of the measuring contact can be adjusted to be the same as the axial direction of the inner wall surface of the measured place by means of a flat end face joint.

The shape and structure of the utility model are suitable for use at the measuring site when measuring the steam seal gap of the steam turbine. It is easy to operate and easy to use when measuring. It can be used as a special inner diameter measuring ruler in the steam seal clearance measuring device of the steam turbine.

Below in conjunction with accompanying drawing, the utility model is described further.

Fig. 1 is a three-dimensional partial cross-sectional schematic diagram of an inner diameter measuring ruler in a steam turbine seal clearance measuring device;

Fig. 2 is a three-dimensional partial cross-sectional schematic view of the fixed arm;

Fig. 3 is the schematic diagram of movable arm bar;

Fig. 4 is a three-dimensional partial cross-sectional schematic diagram of a bearing frame;

Fig. 5 is a three-dimensional partial cross-sectional schematic diagram of the joint of the flat end face of the movable arm at the outer end of the spring box.

The solid line diagram in Fig. 1 is the internal diameter measuring ruler in the steam turbine seal clearance measuring device.

In Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the internal diameter measuring ruler in the steam seal clearance measuring device of the steam turbine has a snap ring ruler seat 1, and a radial ruler arm 4 is threaded on the snap ring ruler seat. The ruler arm has a double-rod fixed ruler arm 5, and a single-rod movable ruler arm 6 that can slide along the axial direction of the double-rod fixed ruler arm is arranged on the double-rod fixed ruler arm. For the axial sliding of the dummy shaft, the card-type circular ruler seat has a circumferential snap ring 2 and an axial snap ring 3. There are axial slits 31 on the circumference of the axial snap ring, and there are clamping bolts 32 at the slits. There are raised edge rings 33, 34 at the two ends of the snap ring, and the circumferential snap ring has two semicircular rings 21, 22, two semicircular rings are spliced at one end, (not shown in the figure) the other end has radial Plate 24, there are clamping bolts 23 between the radial plates, the circumferential snap ring is set between the raised edge rings at both ends of the axial snap ring, and the axial snap ring can be clamped and positioned at the measuring point of the false shaft 7 , the circumferential snap ring can be rotated on the axial snap ring, and the clamping bolt on the circumferential snap ring can be turned to adjust the tight fit between the circumferential snap ring and the axial snap ring. The outer circumference of the circumferential snap ring Radial screw rod 24 is arranged on; The double-bar fixed chi arm has two parallel fixed arm rods 51,52, and the inner side one end of two parallel fixed arm rods has ruler arm seat 53, and the ruler arm seat has and circumferential card The internally threaded hole that the radial screw rod matches on the outer circumference of the ring, the axis of the internally threaded hole is parallel to the fixed arm bar, and there is a cylindrical spring box 54 at the outer end of the two parallel fixed arm bars, and the axis of the cylindrical spring box is in line with the fixed arm bar. The arms are parallel, and there is a through hole at the axis of the cylindrical spring box. There are bearing frames 56 on the two parallel fixed arms. The bearing frames can slide along the axial direction of the double-rod fixed ruler arms. 561, the bearing frame can clamp the dial indicator 57 and the distance sensor 58 with fastening screws 562 and clamp them on two parallel fixed arm bars, the measuring rod 571 of the dial indicator is parallel to the fixed arm bars, and the dial indicator The measuring rod contact is towards the inner side end of the fixed arm, and there is a through hole 55 in the middle of the bearing frame, and the axis of the through hole is parallel to the fixed arm; One end is connected with movable guide plate 62, and there are two circular holes on the movable guide plate, and the two fixed arms of the double-rod fixed ruler arm pass through the two circular holes of the movable guide plate, and the above-mentioned dial gauge measuring rod contacts In contact with the surface of the movable guide plate, the movable arm passes through the through hole in the middle of the bearing frame and the through hole at the axis of the spring box, and the movable arm can extend and retract in the axial direction of the fixed arm. There is a fixed bracket 63 on one section of the arm in the spring box, and there is a compressed coil spring 8 between the fixed bracket and the box bottom of the spring box. One section in the frame has a radial handle 64, and the handle stretches out of the frame, and the frame is provided with two handle stalls 59 for extending and retracting the movable arm bar, and the two stalls are on the axis of the ruler arm. The distance is equal to the distance measuring range of the dial indicator, and the movable arm can be extended or retracted by toggling the handle between the two gears. The extended or retracted range is equal to the distance measuring range of the dial indicator, and the movable arm Usually in an indented position.

In Fig. 1 and Fig. 5, the movable arm has a flat end face joint at the outer end of the spring box, and there are two discs 681, 682 perpendicular to the movable arm bar and coaxial in the flat end face joint, and a disc 681 is connected. At the end of the movable arm bar outside the spring box, there is a short shaft head 683 on the axis of the other disc 682, and an axial internal thread hole is arranged on the short shaft head. The two discs are connected together with a joint 684, and the two discs Before being tightly connected together with a union, the two discs can rotate relative to each other along the axis, and the internally threaded hole on the short shaft head can be connected with a movable arm extension rod with an axial screw at one end and an axial internally threaded hole at the other end 66 or one end has the measuring contact 67 of axial screw rod, the other end has cylindrical surface contact, and measuring contact also can be connected on the movable arm rod extension bar.

Claims (1)

1. inner diameter measurement chi in the Gland Clearance in Steam Turbine measurement mechanism, it is characterized in that: cassette annulus rod support is arranged, be connected with radially chi arm on the cassette annulus rod support, radially the chi arm has two bar fixed ruler arms, having on two bar fixed ruler arms can be along two bar fixed ruler arms single pole adjustable rule arm in axial sliding

(1) cassette annulus rod support has axial snap ring, axially is with circumferential snap ring on the snap ring,

(1.1) axially have axially on the snap ring circumference and crack, there is fishbolt at the place of cracking, and axially there is the edge ring of projection at the two ends of snap ring,

(1.2) circumferentially snap ring has two semicircular ring, two semicircular ring one end hinge joints, and the other end has radial plate, and fishbolt is arranged between radial plate, circumferentially on the excircle of snap ring radially screw rod is arranged, and circumferentially snap ring is enclosed between the edge ring that projection is arranged at axial snap ring two ends;

(2) two bar fixed ruler arms have two parallel fixedly armed levers,

Inboard one end of (2.1) two parallel fixedly armed levers has the chi arm seat, and the internal thread hole that has on the excircle with circumferential snap ring screw rod radially match on the chi arm seat, the axis of internal thread hole be with fixedly armed lever is parallel,

(2.2) the two parallel fixedly armed lever outside one ends have the helical spring box, and the axis of helical spring box is with fixedly armed lever is parallel, and there is through hole at the axis place of helical spring box,

Take up frame on (2.3) two parallel fixedly armed levers, taking up has dial gauge and range sensor on the frame, the sounding rod of dial gauge is with fixedly armed lever is parallel, and the sounding rod contact of dial gauge is towards the inboard of armed lever one end, in the middle of taking up frame through hole is arranged, the axis of through hole is with fixedly armed lever is parallel;

(3) single pole adjustable rule arm has movable armed lever,

(3.1) inboard one end of movable armed lever has movable guide plate, two circular holes are arranged on the movable guide plate, two of two bar fixed ruler arms fixedly armed lever from two circular holes of movable guide plate, pass, above-mentioned dial gauge sounding rod contact contacts with the surface of movable guide plate, movable armed lever passes from the through hole that takes up middle through hole of frame and spring case axis

(3.2) on movable armed lever a section in spring case fixedly washer is arranged, between fixedly at the bottom of the box of washer and spring case the volute spring that makes movable armed lever be subjected to the power of stretching out is arranged, movable armed lever a section in taking up frame has radially handle, handle stretches out and takes up outside the frame, take up and have movable armed lever on the frame and stretch out two handle gears with indentation, two gears equal the finding range of dial gauge at the axial distance of chi arm

(3.3) movable armed lever is connected with the planar end surface loose joint at the outside of spring case one end, have vertical with movable armed lever in the planar end surface loose joint and two coaxial disks, a disk is connected in movable armed lever at the spring case outside one end, on another disk axis the minor axis head is arranged, axial internal thread hole is arranged on the minor axis head

(3.4) being connected with an end on the internal thread hole has axial screw, the other end that the movable armed lever extension rod of axial internal thread hole is arranged,

(3.5) the axial internal thread hole of the movable armed lever extension rod other end is connected with an end has axial screw, the other end that the measuring contacts of face of cylinder contact is arranged.

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