Auxiliary turning gear of nuclear turbine

Abstract

The utility model relates to an auxiliary turning gear of a nuclear turbine, the auxiliary turning gear of the nuclear turbine is connected to the turbine, the turbine comprises a shell and a main turning gear arranged in the shell, and the auxiliary turning gear of the nuclear turbine comprises a support assembly arranged on the shell, an auxiliary turning driving piece and a transmission connecting piece; the auxiliary barring driving part is connected to the support assembly, the auxiliary barring driving part and the main barring device are arranged in a spaced mode in the first direction, the transmission connecting part is arranged between the auxiliary barring driving part and the main barring device in the first direction, and the transmission connecting part comprises a first connecting end and a second connecting end. The second connecting end is detachably connected to the output end of the main turning gear. The auxiliary barring driving part is used for carrying out pre-barring operation on the shaft system of the steam turbine, so that a vertical arc formed in the middle of the rotor shaft system of the steam turbine generator due to long-time static can be corrected, and the success rate of barring operation of a main barring device is increased.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power steam turbine maintenance, and in particular to an auxiliary turning device for a nuclear power steam turbine. Background Art

[0002] When nuclear power steam turbine generators start working, they need to be cranked by a cranking device. However, since the rotor shaft system of the steam turbine generator is shut down for a long time during overhaul, the heights of the bearing seats of the rotor shaft system deviate from the design values ​​due to inconsistent temperatures. In addition, the rotor shaft system of the steam turbine generator is stationary for a long time, forming a sag in the middle, which causes a significant increase in the shaft system torque at a certain angle. As a result, the cranking device in the relevant technology has a high risk of unsuccessful cranking of the steam turbine generator. Utility Model Content

[0003] Based on this, it is necessary to provide a nuclear power steam turbine auxiliary cranking device to address the problem that the cranking device in the related art has a high risk of unsuccessful cranking of the steam turbine generator.

[0004] According to one aspect of the present application, a nuclear power steam turbine auxiliary turning gear device is provided, characterized in that the nuclear power steam turbine auxiliary turning gear device is connected to a steam turbine, the steam turbine comprises a casing and a main turning gear device arranged in the casing, and the nuclear power steam turbine auxiliary turning gear device comprises:

[0005] a support assembly, disposed on the housing; and

[0006] An auxiliary turning gear driving member is connected to the support assembly and is spaced apart from the main turning gear device along a first direction;

[0007] A transmission connecting member is arranged between the auxiliary turning gear driving member and the main turning gear device along the first direction, and the transmission connecting member includes a first connecting end and a second connecting end, the first connecting end is connected to the output shaft of the auxiliary turning gear driving member, and the second connecting end is detachably connected to the output end of the main turning gear device.

[0008] In one embodiment, the support assembly includes a support base and a support rod, the support base is configured to be supported on the housing, and the support rod is connected between the support base and the auxiliary barring gear driving member.

[0009] In one of the embodiments, the nuclear power steam turbine auxiliary turning device includes a plurality of the support assemblies;

[0010] A plurality of the support assemblies are arranged around the output shaft of the auxiliary barring gear driving member at intervals.

[0011] In one embodiment, the nuclear power steam turbine auxiliary turning gear device further comprises a base, the auxiliary turning gear driving member is arranged on the base, and the output shaft of the auxiliary turning gear driving member passes through the base along the first direction and is connected to the first connecting end;

[0012] The support rod is connected to the base.

[0013] In one of the embodiments, the support seat includes a support foot supported on the housing and an adjusting screw rod arranged on the support foot, and one end of the support rod away from the auxiliary turning gear driving member is threadedly engaged with the adjusting screw rod.

[0014] In one of the embodiments, the support seat further includes an anti-skid pad, and the anti-skid pad is arranged on a side of the support foot away from the adjusting screw rod.

[0015] In one of the embodiments, the support seat further includes a locking nut, and the locking nut cooperates with the adjusting screw thread to limit the support rod to a preset position on the support rod.

[0016] In one embodiment, the support rod is configured to be rotatable relative to the auxiliary barring drive member around an axis perpendicular to the first direction.

[0017] In one embodiment, the support rod has a working position and a folded position during rotation around an axis perpendicular to the first direction;

[0018] When the support rod is in the working position, the support seat is placed on the housing;

[0019] When the support rod is in the folded position, the support seat and the housing are separated from each other and are located at a side of the base away from the transmission connection member along the first direction.

[0020] In one embodiment, the base is provided with a first fixing pin and a second fixing pin; the support rod is provided with pin holes corresponding to the first fixing pin and the second fixing pin respectively;

[0021] Along the first direction, the first fixing pin is closer to the transmission connection member than the second fixing pin;

[0022] When the support rod is in the working position, the first fixing pin is inserted into the pin hole;

[0023] When the support rod is in the folded position, the second fixing pin is inserted into the pin hole.

[0024] The above-mentioned nuclear power steam turbine auxiliary turning gear device connects the auxiliary turning gear drive member to the output end of the main turning gear device through a transmission connecting member, and performs pre-turning operation on the shaft system of the steam turbine to be turned through the drive provided by the auxiliary turning gear drive member. After the pre-turning operation, the main turning gear device is used to turn the turbine, thereby correcting the sag formed in the middle of the rotor shaft system of the steam turbine generator due to long-term stationary state, thereby improving the success rate of the turning operation of the main turning gear device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the auxiliary turning device of a nuclear power steam turbine.

[0026] Figure 2 This is a simplified overall diagram of the nuclear power steam turbine auxiliary cranking device installed on the steam turbine generator.

[0027] Figure 3 This is a top view of the auxiliary turning device of a nuclear power steam turbine.

[0028] Figure 4 It is a structural schematic diagram of the support rod being located at the second position.

[0029] Description of Figure Numbers:

[0030] 10. Nuclear power steam turbine auxiliary turning device;

[0031] 100, auxiliary turning gear driving member; 110, speed reducer; 120, output shaft;

[0032] 200, support assembly; 210, support seat; 211, support foot; 212, adjustment screw; 213, locking nut; 214, anti-skid pad; 220, support rod; 221, pin hole; 222, pin shaft;

[0033] 300, base; 310, first fixing pin; 320, second fixing pin;

[0034] 400, transmission connector;

[0035] 500, housing; 510, main turning device; 511, output end;

[0036] F1, first direction. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] The steam turbine generator set of Daya Bay and Ling'ao Phase I nuclear power plants was originally designed by the British GEC Company (later merged into Alstom Company) as a million-kilowatt "full-speed" steam turbine. The unit consists of a double-flow high-pressure cylinder, three double-flow double-exhaust low-pressure cylinders, a generator and an exciter, as well as an electric main turning gear device at the tail end. The total length of its shaft system is about 50.5m. The entire shaft system consists of 12 radial bearings and 1 thrust bearing. The entire rotor shaft system weighs 319t. Its electric main turning gear device is arranged at the tail end of the entire shaft system. The main turning gear device has a turning speed of 38 r / min, and a manual turning gear plate is provided on the bearing seat to realize manual turning operation of the shaft system.

[0044] The original design cranking speed of the steam turbine generator units of the Daya Bay and Ling'ao Phase I nuclear power plants was 38 r / min, and the starting torque of the main cranking device was too small. In the past, the motor overcurrent protection was often activated during the startup process, and the cranking was unsuccessful in one attempt. For this reason, it is necessary to start the cranking operation multiple times, and even to perform manual cranking operations through a manual cranking gear plate to assist the cranking. The specific operation is to open the manual cranking hand hole before starting the electric cranking operation of the main cranking device, and use a special crowbar to slowly crank the rotor of the shaft system. Before the electric cranking operation is about to be started, establish a communication method with the main control room, accelerate the manual cranking at the moment of countdown, and quickly pull out the crowbar after the electric cranking operation is started to achieve auxiliary cranking and improve the success rate of cranking.

[0045] According to historical experience, when the test torque on the turning motor of the main turning device is <300Nm, the electric turning gear can be started successfully in one go in most cases. Under the condition of 300-400Nm power assistance, it will generally start successfully in one go. When it is >400Nm, it will easily cause the turning motor to overload and trip.

[0046] The reason for this situation is that the shaft system of the steam turbine generator set is 50.5m long and weighs 319t. During the overhaul, the shaft system was shut down for a long time. The coordinate heights of the various bearings of the shaft system deviated from the design values ​​due to inconsistent temperatures. The rotor of the shaft system formed a sag arc due to long-term stationary state, causing a significant increase in the shaft system torque at a certain angle. In addition, the small starting torque of the turning motor of the main turning device is also an important reason.

[0047] Based on the above problems, the present application provides an auxiliary turning device, which aims to manually or low-speed electric turning of the shaft system for a period of time before starting the main turning device, so that a sag arc is formed in the middle of the rotor and it becomes straight, that is, the rotor axis is straightened and the eccentricity is reduced, which will reduce the initial friction and facilitate the successful start-up of the main turning device.

[0048] In addition, due to the high cranking speed of the main cranking device, nuclear power steam turbine generators cannot perform gas replacement during cranking. Compared with low-speed units that can perform gas replacement during cranking, the conventional island overhaul period will be 1.5-2 days longer. When there is a cylinder opening project in the short overhaul conventional island, gas replacement will generally become the main key path of the overhaul. If cranking and gas replacement can be carried out in parallel, 1.5-2 days of overhaul period can be saved, and the time saving benefit is extremely obvious.

[0049] Since the rotor of the shaft system of the nuclear power steam turbine generator is a slender structure with a length of 14m and a rotor weight of 98t, alternating stress will be generated due to gravity during cranking. The rotor surface is under tensile stress when it is at the bottom and under compressive stress at the top. At the joints between the generator guard ring, the wire rod and the slot wedge, a slight displacement will be generated due to the alternating stress. After long-term cranking, there will be local micro-motion wear, and in severe cases, the insulation will be damaged. Especially when the nuclear power steam turbine generator unit needs to be cranked for a long time, such as during the temporary shutdown and hot standby period of the nuclear power steam turbine generator unit, and when the conventional island needs to establish vacuum and deoxygenate as soon as possible during overhaul, the low-speed cranking operation can greatly reduce the number of alternating stresses and can significantly reduce the harm to the generator rotor.

[0050] See also Figure 1 and Figure 2 As shown, the nuclear power steam turbine auxiliary turning gear device 10 of the present application is connected to the steam turbine to assist turning of the steam turbine. The steam turbine includes a housing 500 and a main turning gear device 510 disposed in the housing 500. The nuclear power steam turbine auxiliary turning gear device 10 includes a support assembly 200, an auxiliary turning gear driving member 100 and a transmission connecting member 400. The support assembly 200 is disposed on the housing 500. The auxiliary turning gear driving member 100 is connected to the support assembly 200 and is spaced from the main turning gear device 510 along a first direction F1. The transmission connecting member 400 is disposed between the auxiliary turning gear driving member 100 and the main turning gear device 510 along the first direction F1. The transmission connecting member 400 includes a first connecting end and a second connecting end. The first connecting end is connected to the output shaft 120 of the auxiliary turning gear driving member 100, and the second connecting end is detachably connected to the output end 511 of the main turning gear device 510.

[0051] The support assembly 200 is used to carry the auxiliary turning gear drive 100, and enables the auxiliary turning gear drive 100 to be placed on the casing 500 of the steam turbine through the support assembly 200, and then be connected to the output shaft 120 of the auxiliary turning gear drive 100 and the output end 511 of the main turning gear device 510 through the transmission connecting member 400, so that the auxiliary turning gear drive 100 can turn the shaft system of the steam turbine. After the auxiliary turning gear drive 100 turns the shaft system of the steam turbine, the main turning gear device 510 is started and the connection between the auxiliary turning gear drive 100 and the output end 511 of the main turning gear device 510 is disconnected, so that the main turning gear device 510 continues to turn the shaft system of the steam turbine.

[0052] It can be understood that the auxiliary turning device 10 of the nuclear power steam turbine of the present application first performs a pre-turning operation on the shaft system, or auxiliary turning, which can realize the pre-auxiliary turning of the shaft system. The auxiliary turning drive 100 with different output powers can be set to realize the turning of the shaft system at different speeds to meet the pre-turning requirements of the shaft system. For example, the shaft system can be turned at a low speed by the auxiliary turning drive 100, which can make the shaft system straight, greatly reduce the resistance of the shaft system, improve the reliability of the turning operation successfully once, and reduce the risk of the main turning device 510 failing to turn the main turning device 510. And in the state of low-speed turning, the gas replacement of the steam turbine can be completed conveniently, saving working time. And when the hot standby of the steam turbine unit requires a long time of turning, the low-speed turning achieved by the auxiliary turning device can reduce the micro-motion wear damage to the generator rotor caused by alternating stress, and improve the safety of the equipment.

[0053] The above-mentioned low speed means that the cranking speed of the auxiliary cranking gear drive 100 to the shaft system is lower than the cranking speed of the main cranking gear device 510 to the shaft system. In some embodiments, the auxiliary cranking gear device 10 of the nuclear power steam turbine includes a reducer 110, which is arranged on the base 300 and connected to the output shaft 120 of the auxiliary cranking gear drive 100. The auxiliary cranking gear drive 100 integrated with the reducer 110 has a rotation speed of 1500 revolutions per minute, a power of 5.5kw, a reduction ratio of 17, and a rotation speed of the output shaft 120 of 88 revolutions per minute. In some embodiments, the auxiliary cranking gear drive 100 is configured as an explosion-proof motor, and the auxiliary cranking gear drive 100 and the reducer 110 are integrated.

[0054] In some embodiments, the auxiliary turning gear drive 100 is provided with a thermal couple protection system, which can realize overcurrent protection. When the turning gear torque is too large, it can prevent equipment damage and prevent the auxiliary turning gear drive 100 from burning. The auxiliary turning gear drive 100 is also provided with a motor thermal couple tripping device and a power-off sound alarm device, which can sound an alarm when the turning gear trips, that is, to avoid the tripping during the turning gear process causing the rotor of the shaft system to be stationary for a long time and causing the shaft to bend. The motor thermal couple tripping device and the power-off sound alarm device that sound after the motor is powered off are provided, so that the operation and maintenance personnel can intervene in time.

[0055] In some embodiments, the transmission connection member 400 is configured as a quick-install universal coupling, which can realize the quick connection or disconnection of the transmission connection member 400 and the main turning gear device 510, and facilitate the quick connection and commissioning of the auxiliary turning gear device 10 of the nuclear power steam turbine, and quickly disconnect the auxiliary turning gear device 10 of the nuclear power steam turbine from the main turning gear device 510 after the auxiliary turning gear device 10 of the nuclear power steam turbine is shut down, and continue to put the main turning gear device 510 into operation. In addition, the universal coupling can allow a certain centering deviation between the output shaft 120 of the auxiliary turning gear device 10 of the nuclear power steam turbine and the output end 511 of the main turning gear device 510. The universal coupling is also provided with a sliding sleeve that can slide along its axial direction, so as to realize the function of quickly connecting or disconnecting with the main turning gear device 510, and facilitate the quick commissioning of the auxiliary turning gear device 10 of the nuclear power steam turbine and the quick commissioning of the main turning gear device 510 after the shutdown, and reduce the shutdown time of the shaft system of the steam turbine.

[0056] Continue reading Figure 1 As shown, the support assembly 200 includes a support seat 210 and a support rod 220. The support seat 210 is configured to be supported on the outer casing 500. The support rod 220 is connected between the support seat 210 and the auxiliary turning gear drive 100, so that the auxiliary turning gear drive 100 can be supported on the outer casing 500 through the support rod 220 and the support seat 210. Then, the transmission connecting member 400 connected to the auxiliary turning gear drive 100 is quickly connected to the main turning gear device 510, and the shaft system of the turbine can be turned through the auxiliary turning gear drive 100.

[0057] See also Figure 2 and Figure 3 As shown, the auxiliary turning gear device 10 of a nuclear power steam turbine includes a plurality of support assemblies 200, and the plurality of support assemblies 200 are arranged at intervals around the output shaft 120 of the auxiliary turning gear driving member 100. In some embodiments, the support assemblies 200 are arranged in three, and the three support assemblies 200 are arranged around the axis parallel to the first direction F1 around the output shaft 120 of the auxiliary turning gear driving member 100, and the auxiliary turning gear driving member 100 is supported from multiple angles to improve the stability of placing the output shaft 120 of the auxiliary turning gear driving member 100 on the housing 500.

[0058] like Figure 2As shown, the nuclear power steam turbine auxiliary turning gear device 10 also includes a base 300, the auxiliary turning gear drive 100 is arranged on the base 300, and the output shaft 120 of the auxiliary turning gear drive 100 passes through the base 300 along the first direction F1 and is connected to the first connecting end. In some embodiments, the reducer 110 is arranged between the base 300 and the auxiliary turning gear drive 100, and the output shaft 120 integrated with the auxiliary turning gear drive 100 and the reducer 110 passes through the base 300 and is connected to the transmission connecting member 400.

[0059] like Figure 1 and Figure 2 The support rods 220 of the plurality of support assemblies 200 are connected to the base 300. That is, the support rods 220 are connected between the base 300 and the support base 210, and the base 300 carries the auxiliary turning gear driving member 100, so that the auxiliary turning gear driving member 100 is supported and placed on the housing 500 by the base 300, the support rods 220 and the support base 210.

[0060] like Figure 2 The support seat 210 includes a support foot 211 supported on the outer shell 500 and an adjusting screw rod 212 arranged on the support foot 211. The end of the support rod 220 away from the auxiliary turning gear drive 100 is threadedly engaged with the adjusting screw rod 212, so that the height of the support rod 220 along the first direction F1 can be adjusted by the adjusting screw rod 212, so that the support rods 220 of multiple support assemblies 200 can be adjusted separately to achieve leveling of the base 300 and the auxiliary turning gear drive 100 arranged on the base 300, so that the transmission connecting member 400 connected to the output shaft 120 of the auxiliary turning gear drive 100 can be opposite to the output end 511 of the main turning gear device 510.

[0061] The support base 210 further includes a locking nut 213, which is threadably matched with the adjusting screw rod 212 to limit the support rod 220 to a preset position on the support rod 220. After the support rod 220 is adjusted to a preset position relative to the adjusting screw rod 212, the screw rod is limited by the locking nut 213, and the screw rod is limited to the preset position to maintain the leveling of the base 300 and the auxiliary turning gear driving member 100 disposed on the base 300.

[0062] Combination Figure 1 As shown, the support base 210 further includes an anti-skid pad 214, which is disposed on the side of the support foot 211 away from the adjusting screw rod 212. This increases the friction between the support base 210 and the housing 500, thereby improving the stability of placing the auxiliary barring drive member 100 on the housing 500.

[0063] Combined with reference Figure 4As shown, the support rod 220 is configured to be rotatable relative to the auxiliary turning gear drive 100 around an axis perpendicular to the first direction F1, so as to facilitate the folding of the support rod 220 and the support base 210 to facilitate the transportation of the nuclear power steam turbine auxiliary turning gear device 10.

[0064] In some embodiments, a pin shaft 222 connected between the support rod 220 and the base 300 is provided between the support rod 220 and the base 300, and the pin shaft 222 extends along an axial direction perpendicular to the first direction F1. The support rod 220 is rotatably connected to the base 300 through the pin shaft 222 to realize the rotation of the support rod 220 relative to the auxiliary winch drive 100.

[0065] The support rod 220 has a working position and a retracted position during the rotation process around an axis perpendicular to the first direction F1.

[0066] like Figure 2 As shown, when the support rod 220 is in the working position, the support base 210 is placed on the housing 500. At this time, the support base 210 is supported on the housing 500, and the supporting force is transmitted to the base 300 and the auxiliary turning gear drive 100 through the support rod 220, so that the base 300 and the auxiliary turning gear drive 100 can be placed on the housing 500 through the support rod 220 and the support base 210 in the working position.

[0067] like Figure 4 As shown, when the support rod 220 is in the folded position, the support seat 210 and the shell 500 are separated from each other and are located on the side of the base 300 away from the transmission connection member 400 along the first direction F1. The plurality of support rods 220 are all in the folded position, which can facilitate the lifting device to transport the nuclear power steam turbine auxiliary turning device 10 without being affected by the extended support rods 220, and the transportation is convenient.

[0068] The base 300 is provided with a first fixing pin 310 and a second fixing pin 320, and the support rod 220 is provided with a pin hole 221 corresponding to the first fixing pin 310 and the second fixing pin 320 respectively. The support rod 220 is rotated relative to the base 300 so that the pin holes 221 on the support rod 220 correspond to the first fixing pin 310 and the second fixing pin 320 respectively, and are respectively engaged with the first fixing pin 310 and the second fixing pin 320, so that the support rod 220 can be limited to the working position or the folded position respectively.

[0069] And along the first direction F1, compared with the second fixing pin 320, the first fixing pin 310 is closer to the transmission connection member 400, such as Figure 1 When the support rod 220 is in the working position, the first fixing pin 310 is inserted into the pin hole 221. Figure 4 When the support rod 220 is in the folded position, the second fixing pin 320 is inserted into the pin hole 221 .

[0070] It can be understood that when the auxiliary cranking device 10 of the nuclear power steam turbine needs to work, the support rod 220 is rotated to the working position, and the support rod 220 is fixed in the working position by passing the first fixing pin 310 through the pin hole 221, so that the auxiliary cranking drive 100 can be placed on the outer casing 500 through the support rod 220 and the support seat 210, and then the second connecting end of the transmission connecting member 400 is connected to the output end 511 of the main cranking device 510, and the auxiliary cranking drive 100 is turned on, and the shaft system of the steam turbine is cranked by the auxiliary cranking drive 100. After the auxiliary cranking drive 100 is cranked to a certain time, the second connecting end of the transmission connecting member 400 is quickly disconnected from the output end 511 of the main cranking device 510, and the main cranking device 510 is quickly turned on, and the shaft system is cranked by the main cranking device 510. Thereafter, the first fixing pin 310 is loosened, and the support rod 220 is rotated to the retracted position, and the support rod 220 is limited to the retracted position by the second fixing pin 320, and then the nuclear power steam turbine auxiliary turning device 10 is hoisted away by the hoisting device.

[0071] In some embodiments, the nuclear power steam turbine auxiliary cranking device 10 also includes a power box and a control panel, which are respectively connected to the auxiliary cranking gear drive 100 to provide power to the auxiliary cranking gear drive 100 and control the switch of the auxiliary cranking gear drive 100.

[0072] When the shaft system of the steam turbine needs to be cranked, the upper cover of the steam turbine housing 500 is opened, and the upper cover of the main cranking device 510 in the housing 500 is opened, and then the protective cover of the output end 511 of the main cranking device is opened, and the auxiliary cranking device 10 of the nuclear power steam turbine is hoisted to the position of the upper cover corresponding to the opening on the housing 500 by the hoisting device, so that the auxiliary cranking drive member 100 and the main cranking device 510 are basically opposite. The rotating support rod 220 and the support seat 210 are adjusted so that the support rod 220 is in and fixed at the working position, and then the auxiliary cranking device 10 of the nuclear power steam turbine is placed on the housing 500, and then the adjusting screw rods 212 connected to each corresponding support rod 220 are adjusted to level the base 300 and the auxiliary cranking drive member 100, so that the second connection end of the transmission connecting member 400 connected to its output shaft 120 is basically arranged opposite to the output shaft 120 of the main cranking device 510. The auxiliary turning gear drive 100 is connected to the power supply of the power box and attempts to turn. After confirming that the turning is correct, the auxiliary turning gear drive 100 cuts off the power supply, connects the transmission connection 400 and the main turning gear device 510, and then turns on the power supply to start the nuclear power turbine auxiliary turning gear device 10 to perform pre-turning operations on the turbine shaft system, and check whether the main shaft speed of the turbine shaft system meets the requirements. In some embodiments, the main shaft speed is about 2.3 revolutions per minute.

[0073] After the auxiliary turning gear device 10 of the nuclear power steam turbine is put into operation normally, the steam turbine can be controlled to perform operations such as gas replacement and putting into operation the steam turbine shaft seal system. After the auxiliary turning gear device 10 of the nuclear power steam turbine performs the pre-turning operation, the auxiliary turning gear driving member 100 turns on the power, quickly disassembles the transmission connection member 400 and the main turning gear device 510, and restores the protective cover of the output end 511 of the main turning gear, and restores the power supply of the main turning gear device 510, and starts the main turning gear device 510 to perform the turning operation. After that, the support rod 220 and the support seat 210 are rotated so that the support rod 220 is in and limited to the retracted position, and the auxiliary turning gear device 10 of the nuclear power steam turbine is lifted away, that is, the auxiliary turning gear device 10 of the nuclear power steam turbine is disassembled, and the upper cover plate of the main turning gear device 510 and the upper cover plate of the casing 500 of the steam turbine are covered.

[0074] The nuclear power steam turbine auxiliary cranking device 10 of the present application performs a pre-cranking operation on the shaft system of the steam turbine to be cranked through the drive provided by the auxiliary cranking drive 100, and then cranks through the main cranking device 510 after the pre-cranking operation, so as to correct the sag formed in the middle of the rotor shaft system of the steam turbine generator due to long-term static state, and improve the success rate of the main cranking. And in the state of low-speed cranking of the pre-cranking operation, the gas replacement of the steam turbine can be completed conveniently, saving working time. And when the steam turbine unit hot standby and other long-term cranking are required, the low-speed cranking achieved by the auxiliary cranking device can reduce the micro-motion wear damage to the generator rotor caused by alternating stress, and improve the safety of the equipment.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A nuclear power steam turbine auxiliary turning device, characterized in that: The auxiliary turning gear device of the nuclear power steam turbine is connected to the steam turbine, and the steam turbine comprises a casing and a main turning gear device arranged in the casing. The auxiliary turning gear device of the nuclear power steam turbine comprises: a support assembly, disposed on the housing; and An auxiliary turning gear driving member is connected to the support assembly and is spaced apart from the main turning gear device along a first direction; A transmission connecting member is arranged between the auxiliary turning gear driving member and the main turning gear device along the first direction, and the transmission connecting member includes a first connecting end and a second connecting end, the first connecting end is connected to the output shaft of the auxiliary turning gear driving member, and the second connecting end is detachably connected to the output end of the main turning gear device.

2. The nuclear power steam turbine auxiliary turning device according to claim 1, characterized in that: The support assembly comprises a support seat and a support rod. The support seat is configured to be supported on the housing, and the support rod is connected between the support seat and the auxiliary barring gear driving member.

3. The nuclear power steam turbine auxiliary turning device according to claim 2, characterized in that: The nuclear power steam turbine auxiliary turning device comprises a plurality of the support assemblies; A plurality of the support assemblies are arranged around the output shaft of the auxiliary barring gear driving member at intervals.

4. The nuclear power steam turbine auxiliary turning device according to claim 2, characterized in that: The nuclear power steam turbine auxiliary turning gear device also includes a base, the auxiliary turning gear driving member is arranged on the base, and the output shaft of the auxiliary turning gear driving member passes through the base along the first direction and is connected to the first connecting end; The support rod is connected to the base.

5. The nuclear power steam turbine auxiliary turning device according to claim 4, characterized in that: The support seat comprises a support foot supported on the housing and an adjusting screw rod arranged on the support foot, and one end of the support rod away from the auxiliary turning gear driving member is threadedly matched with the adjusting screw rod.

6. The nuclear power steam turbine auxiliary turning device according to claim 5, characterized in that: The support seat also includes an anti-skid pad, which is arranged on a side of the support foot away from the adjusting screw rod.

7. The nuclear power steam turbine auxiliary turning device according to claim 5, characterized in that: The support seat also includes a locking nut, and the locking nut is threadably matched with the adjusting screw rod to limit the support rod to a preset position on the support rod.

8. The nuclear power steam turbine auxiliary turning device according to claim 5, characterized in that: The support rod is configured to be rotatable relative to the auxiliary barring drive member around an axis perpendicular to the first direction.

9. The nuclear power steam turbine auxiliary turning device according to claim 8, characterized in that: The support rod has a working position and a retracted position during the rotation process around an axis perpendicular to the first direction; When the support rod is in the working position, the support seat is placed on the housing; When the support rod is in the folded position, the support seat and the housing are separated from each other and are located at a side of the base away from the transmission connection member along the first direction.

10. The nuclear power steam turbine auxiliary turning device according to claim 9, characterized in that: The base is provided with a first fixing pin and a second fixing pin; the support rod is provided with pin holes corresponding to the first fixing pin and the second fixing pin respectively; Along the first direction, the first fixing pin is closer to the transmission connection member than the second fixing pin; When the support rod is in the working position, the first fixing pin is inserted into the pin hole; When the support rod is in the folded position, the second fixing pin is inserted into the pin hole.

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