Dynamic balance adjusting device for steam turbine rotor

Abstract

The utility model discloses a steam turbine rotor dynamic balance adjusting device which comprises a rotor body, a rotating shaft of the rotor body is movably connected through a first supporting frame and a second supporting frame, a heating assembly is installed on the outer side of the rotor body, and meanwhile the rotating shaft of the rotor body is driven by a motor to rotate. The heating assembly comprises an upper gas uniformizing box. According to the dynamic balance adjusting device for the steam turbine rotor, the upper air uniformizing box wraps the upper side surface of the rotor body, the lower air uniformizing box wraps the lower side surface of the rotor body, and hot air enters the upper air uniformizing box and the lower air uniformizing box through the hot air pipe, so that the hot air can make uniform contact with the outer side of the rotor body; by increasing the contact area between the thermal medium and the rotor body, the uniform heating work of the rotor body is realized, and the reliability of dynamic balance detection and adjustment of the rotor body is improved.

Description

Technical Field

[0001] The utility model relates to the field of steam turbines, in particular to a steam turbine rotor dynamic balance adjustment device. Background Art

[0002] Steam turbine rotor imbalance is widely present in modern large steam turbine generator sets. The consequences of this imbalance are that the equipment vibrates, parts and components are seriously worn, and various accidents are caused, which greatly harms the safe operation of the unit.

[0003] The first-order abnormal vibration of the steam turbine unit is caused by the first-order unbalance of the rotor. For the first-order unbalance caused by permanent bending, low-speed dynamic balancing on site and high-speed dynamic balancing at the manufacturer are generally used as the main means. However, for the first-order unbalance vibration caused by thermal bending, there are few means that can be implemented on site. High-speed dynamic balancing on site is not easy to solve. Returning to the manufacturer can only deal with the first-order unbalance caused by permanent bending, which brings great inconvenience to the safe operation of the unit;

[0004] Regarding the patent of the rotor dynamic balancing device, the Chinese patent with the authorization announcement number CN113155360A discloses a hot low-speed dynamic balancing device and method for a steam turbine rotor; the article includes a method for performing a balancing test on a large steam turbine rotor, using a PVDF sensor to obtain the weak vibration signal generated when the rotor rotates at a low speed, and after processing by a collection device, detecting the first-order unbalance amount of each correction surface; the hot low-speed dynamic balancing device for the steam turbine rotor can use the opportunity of opening the cylinder during unit maintenance, and after the rotor is pulled out, use a heating device to artificially simulate the cylinder environment, truly measure the first-order unbalance state of the rotor caused by thermal variables during normal operation, and accurately correct the first-order unbalance amount caused by thermal bending of the steam turbine rotor;

[0005] When the turbine rotor is undergoing a dynamic balancing test, a heating rope is installed on the turbine rotor to heat it to simulate the set temperature rise target of the rotor. When the heating rope is simulating the heating of the turbine rotor, it cannot evenly heat the outside of the turbine rotor. The turbine rotor is prone to local overheating, resulting in inaccurate test results and easy errors. Utility Model Content

[0006] The utility model aims to provide a steam turbine rotor dynamic balance adjustment device to solve the defects mentioned in the above background technology.

[0007] To achieve the above-mentioned purpose, a turbine rotor dynamic balancing adjustment device is provided, comprising a rotor body, wherein the rotating shaft of the rotor body is movably connected through a first support frame and a second support frame respectively, and a heating component is installed on the outside of the rotor body, and the rotating shaft of the rotor body is driven to rotate by a motor, and the heating component comprises an upper uniform air box, and a lower uniform air box is installed at the bottom of the upper uniform air box, and adjusting tubes are welded and fixed on both sides of the bottom of the lower uniform air box, and the size of the adjusting tube is matched with that of the support seat, the top of the support seat is inserted into the inside of the adjusting tube, and the end of the support seat away from the adjusting tube is welded and fixed to the bottom plate, and a strip opening is opened in the middle of the surface of the bottom plate.

[0008] Preferably, the upper air-leveling box is wrapped around the upper surface of the rotor body, and the lower air-leveling box is wrapped around the lower surface of the rotor body, and a hot air pipe is fixedly installed on the surface of the upper air-leveling box.

[0009] Preferably, a positioning groove is provided on the bottom side wall of the upper uniform air box, and a positioning seat is fixedly installed on the surface of the lower uniform air box, and the size of the positioning seat is matched with that of the positioning groove.

[0010] Preferably, the upper uniform air box and the lower uniform air box are positioned and installed via a positioning seat and a positioning groove, and the positioning seat is inserted into the interior of the positioning groove, and the length of the positioning seat is equal to the depth of the positioning groove.

[0011] Preferably, upper accommodating openings are opened on both sides of the bottom of the upper uniform air box, and lower accommodating openings are opened on both sides of the upper part of the lower uniform air box, and the sizes of the lower accommodating openings are adapted to the upper accommodating openings. At the same time, the lower accommodating openings and the upper accommodating openings are both semicircular structures, and the lower accommodating openings and the upper accommodating openings are combined together to form a circular rotor accommodating hole, and the diameter of the rotor accommodating hole is larger than the diameter of the rotating shaft on the turbine rotor.

[0012] Preferably, an opening is provided on the side wall surface of the adjusting tube, and the opening is U-shaped, and a mounting platform is fixedly provided on the outer side of the opening, a stud is inserted into the inside of the opening, and a mounting nut is screwed on the outer side of the stud, and the end of the stud is welded and fixed to the top of the support seat.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the upper air equalizing box is wrapped around the upper surface of the rotor body, and the lower air equalizing box is wrapped around the lower surface of the rotor body, and the hot air enters the interior of the upper air equalizing box and the lower air equalizing box respectively through the hot air pipe, so that the hot air can be in uniform contact with the outer side of the rotor body, and by increasing the contact area between the heat medium and the rotor body, uniform heating of the rotor body is achieved, thereby improving the reliability of dynamic balancing detection and adjustment of the rotor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0015] Figure 2 The utility model structure Figure 1 Side view of

[0016] Figure 3 The utility model structure Figure 1 A top view of

[0017] Figure 4 The utility model structure Figure 1 Rear view of

[0018] Figure 5 The utility model structure Figure 1 Bottom view of .

[0019] Numbers in the figure: 1, rotor body; 2, first support frame; 3, second support frame; 4, heating assembly; 41, hot air pipe; 42, upper uniform air box; 43, upper receiving opening; 44, positioning seat; 441, positioning groove; 45, lower uniform air box; 46, lower receiving opening; 47, adjusting pipe; 48, mounting table; 49, opening; 50, stud; 51, support seat; 52, bottom plate. DETAILED DESCRIPTION

[0020] See also Figure 1-5 The utility model provides a steam turbine rotor dynamic balancing adjustment device, including a rotor body 1, the rotating shaft of the rotor body 1 is movably connected through a first support frame 2 and a second support frame 3, and a heating component 4 is installed on the outer side of the rotor body 1, and the rotating shaft of the rotor body 1 is driven to rotate by a motor, the heating component 4 includes an upper uniform air box 42, and a lower uniform air box 45 is installed at the bottom of the upper uniform air box 42, and adjusting tubes 47 are welded and fixed on both sides of the bottom of the lower uniform air box 45, and the size of the adjusting tube 47 is adapted to that of a support seat 51, the top of the support seat 51 is inserted into the inside of the adjusting tube 47, and the end of the support seat 51 away from the adjusting tube 47 is welded and fixed to the bottom plate 52, and a strip opening is opened in the middle of the surface of the bottom plate 52.

[0021] Working principle: When in use, the upper air equalizing box 42 is wrapped around the upper surface of the rotor body 1, and the lower air equalizing box 45 is wrapped around the lower surface of the rotor body 1. The hot air enters the upper air equalizing box 42 and the lower air equalizing box 45 respectively through the hot air pipe 41, so that the hot air can be in uniform contact with the outer side of the rotor body 1. By increasing the contact area between the heat medium and the rotor body 1, the rotor body 1 is evenly heated, thereby improving the reliability of dynamic balancing detection and adjustment of the rotor body 1.

[0022] As a preferred embodiment, the upper air-leveling box 42 is wrapped around the upper surface of the rotor body 1 , and the lower air-leveling box 45 is wrapped around the lower surface of the rotor body 1 , and the hot air pipe 41 is fixedly installed on the surface of the upper air-leveling box 42 .

[0023] A positioning groove 441 is provided on the bottom side wall of the upper air-leveling box 42 , and a positioning seat 44 is fixedly installed on the surface of the lower air-leveling box 45 , and the size of the positioning seat 44 is adapted to that of the positioning groove 441 .

[0024] The upper air-leveling box 42 and the lower air-leveling box 45 are inserted into the interior of the positioning groove 441 via the positioning seat 44 , so that the upper air-leveling box 42 and the lower air-leveling box 45 can be quickly connected to the rotor body 1 .

[0025] As a preferred embodiment, the upper air-leveling box 42 and the lower air-leveling box 45 are positioned and installed via a positioning seat 44 and a positioning groove 441 , and the positioning seat 44 is inserted into the positioning groove 441 , and the length of the positioning seat 44 is equal to the depth of the positioning groove 441 .

[0026] As a preferred embodiment, upper accommodating openings 43 are opened on both sides of the bottom of the upper uniform air box 42, and lower accommodating openings 46 are opened on both sides of the upper part of the lower uniform air box 45, and the sizes of the lower accommodating openings 46 and the upper accommodating openings 43 are adapted to each other, and both the lower accommodating openings 46 and the upper accommodating openings 43 are semicircular structures, and the lower accommodating openings 46 and the upper accommodating openings 43 are combined to form a circular rotor accommodating hole, and the diameter of the rotor accommodating hole is larger than the diameter of the rotating shaft on the turbine rotor.

[0027] An opening 49 is provided on the side wall surface of the adjusting tube 47, and the opening 49 is in a "U" shape. A mounting platform 48 is fixedly provided on the outer side of the opening 49, a stud 50 is inserted into the interior of the opening 49, and a mounting nut is screwed on the outer side of the stud 50, and the end of the stud 50 is welded and fixed to the top of the support seat 51.

[0028] The upper uniform air box 42 and the lower uniform air box 45 are combined together to form a heating box, and the height of the heating box can be adjusted by adjusting the pipe 47, the mounting platform 48, the opening 49, the stud 50, and the support seat 51 to adapt to the rotor body 1 of different heights.

[0029] PVDF sensors are installed at the bottom of the first support frame 2 and the second support frame 3. The PVDF sensors are used to obtain the weak vibration signals generated when the rotor rotates at a low speed. After being processed by the acquisition device, the first-order imbalance of each correction surface is detected; the hot low-speed dynamic balancing device for the turbine rotor can take advantage of the opportunity of opening the cylinder during unit maintenance, and use a heating device to artificially simulate the cylinder environment after the rotor is pulled out, and truly measure the first-order imbalance state of the rotor caused by thermal variables during normal operation, and accurately correct the first-order imbalance caused by thermal bending of the turbine rotor; this technical feature has been fully disclosed in the comparative documents submitted in the background technology, and is not a necessary technical feature of this case, so it will not be repeated here.

Claims

1. A steam turbine rotor dynamic balancing adjustment device, comprising a rotor body (1), characterized in that: The rotating shaft of the rotor body (1) is movably connected via the first support frame (2) and the second support frame (3), and a heating assembly (4) is installed on the outer side of the rotor body (1). The rotating shaft of the rotor body (1) is driven to rotate by a motor. The heating assembly (4) comprises an upper uniform air box (42), and a lower uniform air box (45) is installed at the bottom of the upper uniform air box (42). At the same time, an adjusting tube (47) is welded and fixed on both sides of the bottom of the lower uniform air box (45), and the size of the adjusting tube (47) is matched with that of the support seat (51). The top of the support seat (51) is inserted into the inside of the adjusting tube (47), and the end of the support seat (51) away from the adjusting tube (47) is welded and fixed to the bottom plate (52), and a strip opening is provided in the middle of the surface of the bottom plate (52).

2. A steam turbine rotor dynamic balancing adjustment device according to claim 1, characterized in that: The upper air-leveling box (42) is wrapped around the upper surface of the rotor body (1), and the lower air-leveling box (45) is wrapped around the lower surface of the rotor body (1), and a hot air pipe (41) is fixedly mounted on the surface of the upper air-leveling box (42).

3. A steam turbine rotor dynamic balancing adjustment device according to claim 1, characterized in that: A positioning groove (441) is provided on the bottom side wall of the upper air-leveling box (42), and a positioning seat (44) is fixedly mounted on the surface of the lower air-leveling box (45), and the size of the positioning seat (44) is adapted to that of the positioning groove (441).

4. A steam turbine rotor dynamic balancing adjustment device according to claim 3, characterized in that: The upper uniform air box (42) and the lower uniform air box (45) are positioned and installed via a positioning seat (44) and a positioning groove (441), and the positioning seat (44) is inserted into the interior of the positioning groove (441), and the length of the positioning seat (44) is equal to the depth of the positioning groove (441).

5. The steam turbine rotor dynamic balancing adjustment device according to claim 1, characterized in that: The upper air-leveling box (42) has upper accommodating openings (43) on both sides of the bottom, and the lower air-leveling box (45) has lower accommodating openings (46) on both sides of the top, and the sizes of the lower accommodating openings (46) and the upper accommodating openings (43) are matched, and the lower accommodating openings (46) and the upper accommodating openings (43) are both semicircular structures, and the lower accommodating openings (46) and the upper accommodating openings (43) are combined together to form a circular rotor accommodating hole, and the diameter of the rotor accommodating hole is larger than the diameter of the upper shaft of the steam turbine rotor.

6. A steam turbine rotor dynamic balancing adjustment device according to claim 1, characterized in that: The side wall surface of the regulating tube (47) is provided with an opening (49) which is in a "U" shape. A mounting platform (48) is fixedly provided on the outer side of the opening (49). A stud (50) is inserted into the interior of the opening (49). A mounting nut is screwed on the outer side of the stud (50). The end of the stud (50) is fixedly welded to the top of the support seat (51).

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