Tool assembly for measuring axial clearance of small steam turbine

Abstract

The utility model discloses a tool assembly for measuring the axial clearance of a small steam turbine, which comprises a driving frame and a pushing bolt, the driving frame is provided with a carrying part and a first threaded hole, and the carrying part is used for being matched with round notch grooves symmetrically arranged on a rotor shaft section in a cooling water chamber on one side of a steam turbine cylinder body for installation; and the axis of the first threaded hole is parallel to the axis of the rotor shaft section when the carrying part is mounted in the round notch groove. The pushing bolt is installed in the first threaded hole and used for jacking the inner wall of the cooling water chamber so that the rotor shaft of the small steam turbine can move in the axial direction. By means of the tool assembly, the axial clearance of the small steam turbine can be measured more safely.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment maintenance, in particular to a tool assembly for measuring the axial clearance of a small steam turbine. Background Art

[0002] Small steam turbines are widely used in nuclear power plants. For example, they are used as driving devices for feedwater pumps. Steam can be used to drive feedwater pumps during power outages. The rotor of a small steam turbine is a high-speed rotor located in a closed turbine cylinder. A thrust wear ring is provided axially. During equipment maintenance, the axial clearance of the small steam turbine needs to be regularly inspected to assess the wear of the thrust wear ring. At present, when measuring the axial clearance of a small steam turbine, the end of the turbine cylinder is often disassembled with a large opening, and then the rotor shaft is pushed and pulled axially. However, the disassembly of the end of the turbine cylinder increases the risk of foreign matter entering, and there may be residual steam coming out of the cylinder to injure maintenance personnel. Therefore, how to measure the axial clearance of a small steam turbine more safely has become a technical problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a tool assembly for measuring the axial clearance of a small steam turbine, so as to be able to measure the axial clearance of the small steam turbine more safely.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A tool assembly for measuring the axial clearance of a small steam turbine, comprising:

[0006] A driving frame, the driving frame having a yoke portion and a first threaded hole, the yoke portion being used for being installed in cooperation with a circular groove symmetrically arranged on a rotor shaft segment in a cooling water chamber beside a steam engine cylinder body, and the axis of the first threaded hole being parallel to the axis of the rotor shaft segment when the yoke portion is installed in the circular groove;

[0007] A push bolt is installed in the first threaded hole and is used to press the inner wall of the cooling water chamber to make the rotor shaft of the small steam turbine move axially.

[0008] Optionally, in the above tool assembly, the drive frame comprises a first rod and a second rod symmetrically arranged and rotatably connected, the same end of the first rod and the second rod forms a part of the yoke portion, and one of the first rod and the second rod is provided with a second threaded hole facing the other at an end away from the yoke portion;

[0009] The tool assembly includes a tightening bolt installed in the second threaded hole, and the tightening bolt is used to provide a spreading force to enable the yoke part to clamp the rotor shaft segment.

[0010] Optionally, in the above tool assembly, the first rod or the second rod is provided with a groove for accommodating the pressing end of the tightening bolt.

[0011] Optionally, in the above tool assembly, the driving frame includes a connecting beam located between the first rod and the second rod, and two ends of the connecting beam are hinged to the middle portion of the first rod and the middle portion of the second rod respectively.

[0012] Optionally, in the above tool assembly, the first rod and the second rod are symmetrically provided with the first threaded holes, and / or the first threaded hole is provided in the middle of the connecting beam.

[0013] Optionally, in the above tool assembly, the connecting beam includes two connecting plates arranged in parallel, and both ends of the connecting plates are provided with rotating shaft limiting holes for passing the hinge shaft.

[0014] Optionally, the tool assembly further comprises a shaft clamp, which comprises a first clamp and a second clamp that are hingedly connected, and the same end of the first clamp and the second clamp is provided with an arc portion for fitting the rotor shaft segment.

[0015] Optionally, in the above-mentioned tool assembly, one of the first chuck and the second chuck is provided with a third threaded hole, and the other is provided with a through hole corresponding to the position of the third threaded hole, and the third threaded hole is located between the hinge point of the first chuck and the second chuck and the arc-shaped portion, and the tool assembly includes a clamping bolt that passes through the through hole and is connected to the third threaded hole.

[0016] Optionally, in the above tool assembly, the shaft clamp includes a return spring connected between the first clamp and the second clamp.

[0017] Optionally, in the above tool assembly, the central angle corresponding to the arcuate portion of one of the first chuck and the second chuck is less than 90°, and the central angle corresponding to the arcuate portion of the other chuck is greater than 90°.

[0018] The tool assembly provided by the utility model is used to measure the axial clearance of a small steam turbine. When in use, the yoke of the driving frame is installed in cooperation with the circular groove symmetrically arranged on the rotor shaft section in the cooling water chamber beside the steam turbine cylinder body, and the first threaded hole of the driving frame is pushed to install the bolt, and the driving frame can move relative to the cooling water chamber along the axial direction of the rotor shaft section by pressing the inner wall of the cooling water chamber. Since the tool assembly is used in the cooling water chamber beside the steam turbine cylinder body, it is only necessary to disassemble the top cover of the cooling water chamber, and there is no need to disassemble the closed steam turbine cylinder body. In this way, the risk of foreign matter entering the steam turbine cylinder body is reduced, and the risk of residual steam escaping from the cylinder body and injuring maintenance personnel is also reduced. It can be seen that the axial clearance of a small steam turbine can be measured more safely with the help of the tool assembly of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of a tool assembly for measuring the axial clearance of a small steam turbine provided in the first embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure shown in another viewing angle;

[0022] Figure 3 It is a schematic diagram of the shaft clamp of the tool assembly for measuring the axial clearance of a small steam turbine provided in the second embodiment of the utility model;

[0023] Figure 4 yes Figure 3 The left view shows the fitting relationship between the shaft clamp and the dial indicator.

[0024] The markings in the figure are:

[0025] 11. first rod; 12. second rod; 121. groove; 2. jacking bolt; 3. push bolt; 4. connecting plate; 5. hinge shaft; 6. rotor shaft section; 71. first clamp; 711. first arc-shaped portion; 72. second clamp; 721. second arc-shaped portion; 8. pin shaft; 9. reset spring; 10. clamping bolt; 200. dial indicator. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1 and Figure 2 The utility model provides a tool assembly for measuring the axial clearance of a small steam turbine in the first embodiment, including a driving frame and a push bolt 3, the driving frame having a yoke portion and a first threaded hole, the yoke portion being used for being installed in cooperation with a circular groove symmetrically arranged on a rotor shaft segment 6 in a cooling water chamber (not shown in the figure) beside a steam turbine cylinder body (not shown in the figure), Figure 1 and Figure 2 The display shows the situation when the yoke is installed on the rotor shaft segment 6, that is, Figure 1 and Figure 2 What is shown is the use state of the tool assembly. The axis of the first threaded hole is parallel to the axis of the rotor shaft segment 6 when the yoke portion is installed in the circular groove. The push bolt 3 is installed in the first threaded hole, which is used to press the inner wall of the cooling water chamber to make the rotor shaft of the small steam turbine move axially. It should be noted that the cooling water chamber is a facility located outside the steam turbine cylinder body, arranged between the small steam turbine and the feed water pump driven by the small steam turbine, so it can also be called an intermediate water chamber. The rotor shaft segment 6 is the part of the rotor shaft of the small steam turbine that extends to the cooling water chamber, and the circular groove on the rotor shaft segment 6 is the original structure of the rotor shaft segment 6. The yoke portion refers to the yoke-like part of the drive frame. This part of the drive frame spans the rotor shaft segment 6 and abuts against the shoulder at the circular groove on the rotor shaft segment 6 in the axial direction. Figure 1 and Figure 2 Only a portion of the rotor shaft segment 6 is shown, and the entire length of the rotor shaft segment 6 corresponds to the dimension of the cooling water chamber along the axial direction of the rotor shaft segment 6 .

[0028] The tool assembly of this utility model needs to be matched with the dial indicator 200 (see Figure 4 ) or other suitable length measuring gauges that can play the same role as the dial indicator 200. When it is necessary to measure the axial clearance of the small steam turbine, first open the top cover of the cooling water chamber, rotate the rotor shaft segment 6 to ensure that the circular groove is roughly located on both sides in the horizontal direction, and then put the yoke of the drive frame downward on the circular groove of the rotor shaft segment 6, as shown in the figure. Figure 1 and Figure 2As shown, the yoke is inserted into the circular groove of the rotor shaft segment 6, and the yoke abuts against the wall of the circular groove, thereby limiting the axial movement of the drive frame relative to the rotor shaft segment 6. The dial gauge 200 can be fixed to the cooling water chamber by a meter frame with a magnetic device, for example, so that the measuring head of the dial gauge 200 faces the direction parallel to the axis of the rotor shaft segment 6 and abuts against the drive frame. After rotating the push bolt 3 so that the push bolt 3 presses against the inner wall of the cooling water chamber or other suitable objects fixed relative to the cooling water chamber, continuing to rotate the push bolt 3 will cause the drive frame to move axially with the rotor shaft segment 6 relative to the cooling water chamber, thereby realizing the axial movement of the rotor shaft of the small steam turbine. During the axial movement of the rotor shaft of the small steam turbine, the axial movement distance can be obtained through the dial gauge 200.

[0029] It should be understood that in order to measure the axial clearance, the rotor shaft of the small steam turbine will be moved in two opposite axial directions to reach the active limit positions of the rotor shaft in two opposite directions. Before the drive frame moves in the opposite direction, the dial indicator 200 is adjusted to a suitable position so that the reverse movement distance of the drive frame can be measured later. For example, the dial indicator 200 can be fixed from the original position to the other side of the drive frame and the measuring head can be abutted against the drive frame. The push bolt 3 is then rotated in the opposite direction. After the push bolt 3 hits the inner wall of the cooling water chamber or other suitable objects fixed relative to the cooling water chamber, continuing to rotate the push bolt 3 will cause the drive frame to move axially relative to the cooling water chamber together with the rotor shaft segment 6.

[0030] When measuring the axial clearance of a small steam turbine with the aid of the tool assembly of the utility model, the tool assembly is used in the cooling water chamber next to the turbine cylinder body, so the closed turbine cylinder body does not need to be disassembled. This reduces the risk of foreign matter entering the turbine cylinder body and the risk of residual steam escaping from the cylinder body and injuring maintenance personnel. It can be seen that the axial clearance of a small steam turbine can be measured more safely with the aid of the tool assembly of the utility model.

[0031] In some embodiments, the drive frame may include a first rod 11 and a second rod 12 that are symmetrically arranged and rotatably connected, the same end of the first rod 11 and the second rod 12 forming a part of the yoke, and one of the first rod 11 and the second rod 12 is provided with a second threaded hole facing the other at an end away from the yoke. The tool assembly includes a tightening bolt 2 installed in the second threaded hole, and the tightening bolt 2 is used to provide a spreading force to enable the yoke to clamp the rotor shaft segment 6. Figure 1In the exemplary embodiment, the first rod 11 is provided with a second threaded hole, and one end of the clamping bolt 2 is against the side of the second rod 12 facing the first rod 11. By rotating the clamping bolt 2, the first rod 11 and the second rod 12 can be further apart from one end of the yoke portion, so that the end where the yoke portion is located clamps the rotor shaft segment 6, thereby improving the firmness of the drive frame on the rotor shaft segment 6. In the case where the first rod 11 is provided with a second threaded hole, the second rod 12 can be provided with a groove 121 for accommodating the pressing end of the clamping bolt 2. The size of the groove 121 should be larger than the diameter of the pressing end of the clamping bolt 2 to meet the need for the pressing end of the clamping bolt 2 to slide in the groove 121. For example, the groove 121 can be set to an oblong hole shape, such as Figure 1 and Figure 2 shown.

[0032] In some embodiments, the first rod 11 and the second rod 12 may be directly rotatably connected or indirectly rotatably connected through other parts. For example, the driving frame may include a connecting beam located between the first rod 11 and the second rod 12, and the two ends of the connecting beam are respectively hinged to the middle of the first rod 11 and the middle of the second rod 12. There are many options for the structural form of the connecting beam. For example, in some embodiments, the connecting beam may include two connecting plates 4 arranged in parallel, and the two ends of the connecting plates 4 are provided with rotating shaft limiting holes for passing the hinge shaft 5.

[0033] exist Figure 1 In the exemplary embodiment, the first rod 11 and the second rod 12 are symmetrically provided with first threaded holes for installing the push bolts 3. The two push bolts 3 can make the driving frame evenly stressed, thereby facilitating the smooth axial movement of the rotor shaft segment 6. In the case where a connecting beam exists, the first threaded hole can also be opened in the middle of the connecting beam, which can also make the driving frame evenly stressed, thereby facilitating the smooth axial movement of the rotor shaft segment 6.

[0034] See also Figure 3 and Figure 4 , Embodiment 2 of the present utility model provides a tool assembly for measuring the axial clearance of a small steam turbine. The difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 adds a shaft clamp on the basis of Embodiment 1, and utilizes the shaft clamp to cooperate with the dial indicator 200, that is, the measuring head of the dial indicator 200 is against the shaft clamp, so that the position of the dial indicator 200 can be arranged more flexibly, and it is only necessary to adjust the shaft clamp to a suitable position of the rotor shaft segment 6. The shaft clamp includes a first clamp 71 and a second clamp 72 that are hingedly connected, and the same end of the first clamp 71 and the second clamp 72 is provided with an arc portion for fitting the rotor shaft segment 6. After the shaft clamp is clamped on the rotor shaft segment 6 by the arc portion, it remains relatively fixed with the rotor shaft segment 6, so when the rotor shaft segment 6 moves in the axial direction, the shaft clamp moves with the rotor shaft segment 6, so that the axial movement distance of the rotor shaft segment 6 can be measured by the dial indicator 200.

[0035] exist Figure 3 In the exemplary embodiment, the first arc portion 171 of the first clamp 71 corresponds to a central angle of less than 90°, and the second arc portion 172 of the second clamp 72 corresponds to a central angle of greater than 90°, that is, the first clamp 71 and the second clamp 72 are set to an asymmetric structure. Of course, in other embodiments, the first clamp 71 and the second clamp 72 can also be set to a symmetric structure, for example, the first arc portion 171 of the first clamp 71 and the second arc portion 172 of the second clamp 72 are equal in size, both corresponding to a central angle of 120°.

[0036] In some embodiments, one of the first chuck 71 and the second chuck 72 may be provided with a third threaded hole, and the other may be provided with a through hole corresponding to the position of the third threaded hole, the third threaded hole is located between the hinge point of the first chuck 71 and the second chuck 72 and the arc portion, and the tool assembly includes a clamping bolt 10 that passes through the through hole and is connected to the third threaded hole. Figure 3 In the exemplary embodiment, the first clamp 71 is provided with a third threaded hole, the clamping bolt 10 passes through the through hole of the second clamp 72 and is connected to the third threaded hole, the first clamp 71 and the second clamp 72 are hinged by the pin 8, the clamping bolt 10 is located between the pin 8 and the arc portion, and the shaft clamp can be more firmly clamped on the rotor shaft segment 6 by rotating the clamping bolt 10.

[0037] In some embodiments, the shaft clamp may include a return spring 9 connected between the first clamp 71 and the second clamp 72. Figure 3 In the exemplified embodiment, the return spring 9 is a compression spring arranged at one end of the first clamp 71 and the second clamp 72 away from the arc portion. In other embodiments, the return spring 9 may also be arranged in other forms, such as being arranged as a torsion spring located at the pin 8, or being arranged as a tension spring located between the pin 8 and the arc portion.

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tool assembly for measuring the axial clearance of a small steam turbine, characterized in that: include: A driving frame, the driving frame having a yoke portion and a first threaded hole, the yoke portion being used for being installed in cooperation with a circular groove symmetrically arranged on a rotor shaft segment in a cooling water chamber beside a steam engine cylinder body, and the axis of the first threaded hole being parallel to the axis of the rotor shaft segment when the yoke portion is installed in the circular groove; A push bolt is installed in the first threaded hole and is used to press the inner wall of the cooling water chamber to make the rotor shaft of the small steam turbine move axially.

2. The tool assembly according to claim 1, characterized in that The drive frame comprises a first rod and a second rod symmetrically arranged and rotatably connected, the same end of the first rod and the second rod forming a part of the yoke portion, and one of the first rod and the second rod is provided with a second threaded hole facing the other at an end away from the yoke portion; The tool assembly includes a tightening bolt installed in the second threaded hole, and the tightening bolt is used to provide a spreading force to enable the yoke part to clamp the rotor shaft segment.

3. The tool assembly according to claim 2, characterized in that The first rod or the second rod is provided with a groove for accommodating the pressing end of the tightening bolt.

4. The tool assembly according to claim 2, characterized in that The driving frame comprises a connecting beam between the first rod and the second rod, and two ends of the connecting beam are respectively hinged to the middle part of the first rod and the middle part of the second rod.

5. The tool assembly according to claim 4, characterized in that The first rod and the second rod are symmetrically provided with the first threaded holes, and / or the middle portion of the connecting beam is provided with the first threaded hole.

6. The tool assembly according to claim 4, characterized in that The connecting beam comprises two connecting plates arranged in parallel, and both ends of the connecting plates are provided with rotating shaft limiting holes for passing the hinge shaft.

7. The tool assembly according to any one of claims 1 to 6, characterized in that: It also includes a shaft clamp, which includes a first clamp and a second clamp that are hingedly connected, and the same end of the first clamp and the second clamp is provided with an arc portion for fitting the rotor shaft segment.

8. The tool assembly according to claim 7, characterized in that One of the first chuck and the second chuck is provided with a third threaded hole, and the other is provided with a through hole corresponding to the position of the third threaded hole, and the third threaded hole is located between the hinge point of the first chuck and the second chuck and the arc portion, and the tool assembly includes a clamping bolt that passes through the through hole and is connected to the third threaded hole.

9. The tool assembly according to claim 8, characterized in that The shaft clamp includes a return spring connected between the first clamp and the second clamp.

10. The tool assembly according to claim 7, characterized in that The central angle of the arc portion of one of the first chuck and the second chuck is smaller than 90°, and the central angle of the arc portion of the other chuck is larger than 90°.

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