Turbogenerator turning gear

Abstract

The application relates to an emergency turning device for a steam turbine generator, which comprises a motor, a speed reducer and a transmission box connected in sequence along a power transmission direction, the bottom of the transmission box is provided with a pawl which can slide horizontally relative to the transmission box to drive intermittent rotation of a ratchet of the steam turbine generator. The emergency turning device for the steam turbine generator can be installed within half an hour, the function of turning the rotor is realized, the maintenance efficiency is high, the safety is good, and the operation can be completed by one person.

Description

Technical Field

[0001] This invention relates to the field of steam turbine generator maintenance technology, and in particular to a steam turbine generator turning gear. Background Technology

[0002] The turbine turning gear is a crucial piece of equipment in the main power plant unit. It is the drive device that rotates the shaft system before and after unit startup. Before the turbine starts up, the turning gear drives the shaft system to rotate continuously at low speed to check whether the turbine is ready for startup, such as whether the moving and stationary parts are rubbing against each other and whether the main shaft bending is normal. More importantly, it ensures that after the turbine is shut down, the turbine rotor continues to be rotated and cooled while in a hot state, preventing permanent thermal bending of the turbine rotor.

[0003] The main turning gear of a certain steam turbine was imported as a whole, and its control logic is an undecipherable "black box." There have been multiple instances where control system malfunctions have prevented the turning gear from operating normally. Furthermore, the main turning gear is electrically driven; when individual bearings in the turbine generator shaft system seize, the main turning gear cannot rotate the turbine rotor due to insufficient output torque. If the turbine rotor, under heat, cannot be continuously cooled by turning, it will bend and deform, causing severe damage to the equipment. Several serious accidents, both domestically and internationally, have occurred due to turning gear malfunctions leading to permanent deformation of the turbine rotor, resulting in huge economic losses for power plants.

[0004] To ensure the safety of unit start-up and shutdown, the power plant has implemented a series of emergency measures. However, due to limitations in on-site process conditions, the emergency rotor turning operation takes a long time and cannot meet the need for rapid response. Currently, the power plant uses a crane to tow a steel wire rope to turn the rotor. The specific steps are as follows: remove the LP1-LP2 coupling cover and support device; remove the coupling windproof guard plate; use a special tensioning tool to symmetrically remove the connecting bolts of the two couplings; install the turning pin; connect the sling and crane hook, and turn the rotor.

[0005] However, the above steps are time-consuming and labor-intensive, with a lengthy preparation process for rotor rotation. This is especially true for larger rotors, which experience significant elastic deformation after settling. Each shaft adjustment requires two hours of continuous manual rotation to eliminate this deformation. Industry experience shows that rotors will undergo permanent deformation after 30 minutes of settling at high temperatures. Therefore, the existing methods described above can lead to rotor deformation and affect its service life. Clearly, achieving rotor rotation quickly (especially within 30 minutes) is crucial.

[0006] In addition, using the existing method of using a crane to tow a wire rope to rotate the rotor poses significant safety hazards. Due to the weight of the rotor, the wire rope is under heavy load, making it prone to problems such as deformation and slippage of the rotating pin, which could cause injury to operators and serious damage to the equipment. Furthermore, the manual rotating tool is approximately 3 meters long, requiring multiple people to operate the rotor simultaneously, which is not conducive to standardized and civilized on-site maintenance. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects described in the prior art and provide an emergency turning gear device for steam turbine generators. This emergency turning gear device can be installed within half an hour, realize the function of turning the rotor, and has high maintenance efficiency, good safety, and can be operated by a single person.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An emergency turning gear for a steam turbine generator is characterized in that it includes a motor, a reducer, and a transmission box connected in sequence along the power transmission direction. The bottom of the transmission box is provided with a pawl, which can slide horizontally relative to the transmission box to drive the ratchet of the steam turbine generator to rotate intermittently.

[0010] As one possible implementation, the housing of the transmission box has an upper slider, a gear set and a lower slider connected in sequence from top to bottom, with a rack below the upper slider and a rack above the lower slider, and a pawl fixedly connected to the lower slider below.

[0011] As one possible implementation, the gear set includes a meshing first gear and a second gear.

[0012] As one possible approach, the first gear and the second gear are the same size.

[0013] As one possible implementation, the transmission case also includes a connecting plate that is flush with the top of the gear set.

[0014] As one possible implementation, a support base is detachably connected to the lower part of the connecting plate.

[0015] As one possible implementation, the support base is arched, and bolt holes are provided on the feet of the support base.

[0016] As one possible implementation, the horizontal sliding stroke of the pawl is 50-100 mm.

[0017] As one feasible approach, the pawl makes 20-22 round trips per minute.

[0018] As one possible implementation, the ratchet rotates at a speed ranging from 0.3 to 0.5 r / min.

[0019] Compared with the prior art, the emergency turning gear device for steam turbine generators provided by the present invention has the following beneficial effects:

[0020] The emergency turning gear device for a steam turbine generator provided by this invention includes a motor, a reducer, and a transmission box arranged sequentially along the power transmission direction. A pawl is provided at the bottom of the transmission box, which can slide horizontally relative to the transmission box. The pawl drives the ratchet of the steam turbine generator to rotate intermittently, preventing permanent deformation of the rotor caused by static placement in a high-temperature environment. The pawl of this emergency turning gear device is aligned with the ratchet of the steam turbine generator for installation, which can be completed within 30 minutes, making the installation process convenient and quick. Using this emergency turning gear device replaces the traditional method of using a traveling crane to tow a steel cable to turn the rotor, allowing a single person to easily complete the rotor turning operation without causing injury to the operator, thus ensuring high safety. Furthermore, this emergency turning gear device is versatile and can be directly used with various types of generator sets both domestically and internationally, making it of significant promotional value. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a left view of the turbine generator turning gear device provided in an embodiment of the present invention, in which the transmission box is viewed in section.

[0023] Figure 2 This is a front view of the turbine generator turning gear device provided in an embodiment of the present invention, wherein the transmission box is viewed in section.

[0024] Figure 3 This is a schematic diagram of the turbine generator turning gear and ratchet engagement provided in an embodiment of the present invention;

[0025] Figure 4 This is a top view of the turbine generator turning gear provided in an embodiment of the present invention after the support base has been installed;

[0026] Figure 5 This is a wiring diagram of the electrical control box for the turbine generator turning gear provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Motor; 2. Reducer; 3. Transmission box; 31. Pawl; 32. Housing; 33. Upper slider; 34. Gear set; 341. First gear; 342. Second gear; 35. Lower slider; 36. Connecting plate; 37. Support base; 371. Foot; 372. Bolt hole; 4. Ratchet. Detailed Implementation

[0029] Although the turbine generator turning gear of the present invention can be implemented in many different ways, exemplary embodiments will be described in detail herein with reference to the accompanying drawings. It is to be understood that the description herein should be considered as illustrative of the structure of the turbine generator turning gear and is not intended to limit the scope of protection of the invention to the exemplary embodiments. Therefore, in essence, the accompanying drawings and the description of specific embodiments should be considered as illustrative rather than limiting of the invention.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "front," "inner," "outer," "top," "bottom," "horizontal," and "vertical," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] The following detailed description provides further details on specific implementation methods.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, this invention provides an emergency turning gear device for a steam turbine generator, comprising a motor 1, a reducer 2, and a transmission box 3 connected sequentially along the power transmission direction. The motor 1 has a power of 5.5 kW, a voltage of 380 V, and an actual output torque of 2000 N. A pawl 31 is provided at the bottom of the transmission box 3, and the pawl 31 can slide horizontally relative to the transmission box 3 under the drive of the motor 1. Figure 2 and Figure 4 As shown, the pawl 31 can slide left and right. When the pawl 31 slides to the left, it can push the ratchet 4, which is adapted to the rotor of the steam turbine generator, to rotate counterclockwise. Then the pawl 31 slides to the right. At this time, the ratchet 4 is in a stationary state. Therefore, the pawl 31 drives the ratchet 4 to rotate intermittently.

[0033] like Figure 1 and Figure 2As shown, the housing 32 of the transmission box 3 contains an upper slider 33, a gear set 34, and a lower slider 35 connected sequentially from top to bottom. The lower slider 33 has a rack below it that meshes with the gear set 34, and the lower slider 35 also has a rack above it that meshes with the gear set 34. A pawl 31 is fixedly connected to the bottom of the lower slider 35. The upper slider 33 is connected to the output shaft of the reducer 2, allowing it to move left and right. This output shaft is eccentrically positioned; rotation of the eccentric shaft causes the upper slider 33 to move linearly, i.e., slide left and right. The upper slider 33 transmits the power from the reducer 2 to the lower slider 35 via the gear set 34, enabling the lower slider 35 to slide left and right, which in turn drives the pawl 31 to slide left and right.

[0034] The housing 32 is divided into an upper housing and a lower housing. An upper slider 33 is disposed within the upper housing, which also contains a slide rail adapted to the upper slider 33, allowing the upper slider 33 to slide stably within the slide rail. Preferably, there are two slide rails, symmetrically arranged on both sides of the upper slider 33, allowing the upper slider 33 to slide between the two slide rails. A lower slider 35 is disposed within the lower housing, which also contains a slide rail adapted to the lower slider 35, allowing the lower slider 35 to slide stably within the slide rail. Preferably, there are two slide rails, symmetrically arranged on both sides of the lower slider 35, allowing the lower slider 35 to slide between the two slide rails.

[0035] like Figure 2 As shown, the gear set 34 includes a first gear 341 and a second gear 342 that mesh with each other. The first gear 341 meshes with the rack of the upper slider 33, and the second gear 342 meshes with the rack of the lower slider 35. Preferably, the first gear 341 and the second gear 342 are the same size. More specifically, the first gear 341 and the second gear 342 are arranged vertically, that is, their geometric centers are arranged on the same vertical axis.

[0036] Furthermore, the transmission housing 3 also includes a connecting plate 36, which is located at the bottom of the upper housing, flush with the top of the gear set 34 (the top of the first gear 341). A support base 37 is detachably connected below the connecting plate 36, for example, by bolts. The support base 37 has an arched or bow-shaped overall shape, with a semi-circular space (openwork) on its inner side, capable of accommodating the ratchet 4. The pawl 31 is located within the semi-circular space and abuts against the ratchet 4. Figure 3 and Figure 4 As shown, the support base 37 has feet 371 on both sides. The feet 371 are detachable and have a set of bolt holes 372 for installation. The bolt holes 372 are set according to the actual installation needs. For example, the feet 371 suitable for installing the support base 37 are selected according to the mounting hole of the front box of a certain model of high pressure cylinder.

[0037] like Figure 2 As shown, the horizontal sliding stroke of the pawl 31 ranges from 50 to 100 mm. It should be noted that the maximum horizontal sliding stroke of the pawl 31 refers to the length between its leftmost and rightmost positions, and is preferably 100 mm. During operation, the pawl 31 performs a reciprocating motion, or a reciprocating "straight-pull" motion, which reduces the impact on the base caused by the disc torque. The pawl 31 reciprocates 20-22 times per minute, preferably 21 times. The rotational speed of the ratchet 4 ranges from 0.3 to 0.5 r / min, preferably 0.43 r / min.

[0038] The installation method for the turbine generator turning gear is as follows: Clean the work area, confirm that it is clean and free of foreign objects, and remove the manhole cover plate on the top of the high-pressure cylinder front box; use a crane to lift the turbine generator turning gear to the area directly above the manhole; adjust the position of the connecting plate 36 (the connecting plate 36 has a long notch) so that the pawl 31 and the ratchet 4 are aligned on their left and right symmetrical center lines, tighten the bolts, and fix the device; before starting the turbine generator turning gear, ensure that the third tooth of the ratchet 4 on the turbine rotor is engaged (from the vertical center line of the ratchet 4, the third tooth in the forward direction of the ratchet 4); confirm that the GGR jacking oil pump has started; have an electrician connect the external power supply (working voltage 380V) to the electrical control box, insert the plug of the ratchet turning gear motor lead wire into the electrical control box socket, and turn on the switch (the indicator light on the electrical control box will illuminate); after confirming that there is no obstruction when the pawl 31 pushes the ratchet 4, press the continuous start button on the electrical control box (e.g., Figure 5 As shown, the ratchet turning gear begins to work continuously; after the work is completed, the power is disconnected, and the entire assembly is lifted away from the turbine generator turning gear device.

[0039] When the turbine generator turning gear is used for maintenance turning gear installation, the installation method is as follows: remove the connecting bolts of the split face of the high-pressure cylinder front box and lift the top cover of the high-pressure cylinder front box; use a crane to lift the support seat 37 to the upper part of the front box, tighten the connecting bolts, and fix the support seat 37; lift the turbine generator turning gear to the top of the support seat 37; adjust the position of the connecting plate 36 (the connecting plate 36 has a long notch) so that the pawl 31 and the left and right symmetrical center lines of the ratchet 4 are aligned, tighten the bolts, and fix the device; before starting, ensure that the pawl 31 is aligned with the ratchet 4. With pawl 31 at its maximum forward stroke, tighten the third tooth of ratchet 4 on the turbine rotor; confirm that the GGR jacking oil pump has started; have an electrician connect the external power supply (working voltage 380V) to the electrical control box, insert the plug of the ratchet turning motor lead wire into the electrical control box socket, and turn on the switch (the indicator light on the electrical control box will illuminate); after confirming that there is no obstruction in the ratchet pawl pushing the ratchet, press the continuous start button on the electrical control box, and the ratchet turning machine will start working continuously; after the work is completed, disconnect the power supply and lift the entire turning machine device away.

[0040] It is worth noting that when the turbine generator turning gear is used as a maintenance turning gear, the installation method of the turbine generator turning gear and the support base 37 can also be as follows: During the unit overhaul, the front bearing housing cover of the turbine high-pressure cylinder is removed, and the connecting plate 36 of the turbine generator turning gear is fixedly installed on the support base 37; they are hoisted as a whole to the split surface of the front bearing housing of the turbine high-pressure cylinder, the pawl 31 is aligned with the ratchet 4 on the turbine rotor, the bolt holes on the support base 37 are aligned with the corresponding bolt holes on the split surface of the bearing housing, and the bolts are tightened to fix the support base, thus realizing the maintenance turning gear function.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An emergency turning gear device for a steam turbine generator, characterized in that, The system includes a motor (1), a reducer (2), and a transmission box (3) connected sequentially along the power transmission direction. The bottom of the transmission box (3) is provided with a pawl (31), which can slide horizontally relative to the transmission box (3) to drive the ratchet (4) of the steam turbine generator to rotate intermittently. Inside the housing (32) of the transmission box (3) are an upper slider (33), a gear set (34), and a lower slider (35) connected sequentially from top to bottom. Below the upper slider (33) is a rack that meshes with the gear set (34), and above the lower slider (35) is a rack that meshes with the gear set (34). The gear set (34) is engaged with a rack, and the pawl (31) is fixedly connected to the lower slider (35). The upper slider (33) is connected to the output shaft of the reducer (2) so that the upper slider (33) can move left and right. The output shaft is eccentrically set, and the upper slider (33) moves linearly by rotating the eccentric shaft. The upper slider (33) transmits the power of the reducer (2) to the lower slider (35) through the gear set (34), so that the lower slider (35) can slide left and right, thereby driving the pawl (31) to slide left and right.

2. The emergency turning gear device for a steam turbine generator according to claim 1, characterized in that, The gear set (34) includes a first gear (341) and a second gear (342) that mesh.

3. The emergency turning gear device for a steam turbine generator according to claim 2, characterized in that, The first gear (341) and the second gear (342) are the same size.

4. The emergency turning gear device for a steam turbine generator according to claim 1, characterized in that, The transmission box (3) also includes a connecting plate (36), which is flush with the top of the gear set (34).

5. The emergency turning gear device for a steam turbine generator according to claim 4, characterized in that, A support base (37) is detachably connected to the lower part of the connecting plate (36).

6. The emergency turning gear device for a steam turbine generator according to claim 5, characterized in that, The support base (37) is arched, and bolt holes (372) are provided on the foot (371) of the support base (37).

7. The emergency turning gear device for a steam turbine generator according to claim 1, characterized in that, The horizontal sliding stroke of the pawl (31) is 50-100mm.

8. The emergency turning gear device for a steam turbine generator according to claim 1, characterized in that, The pawl (31) makes 20-22 round trips per minute.

9. The emergency turning gear device for a steam turbine generator according to claim 1, characterized in that, The rotational speed of the ratchet (4) is 0.3-0.5 r / min.

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