Off-line assembly method for flow-through components of steam turbine cylinder

Abstract

The present invention discloses a method for offline assembly of a turbine cylinder flow-through component, which is used to simulate the on-site installation state of a turbine and realize the detection and debugging of the cylinder flow-through component, and comprises the following steps: Step S1: constructing an assembly mechanism, installing an inner cylinder assembly onto the assembly mechanism, and performing position debugging of the assembly mechanism and detection and debugging of the inner cylinder assembly; Step S2: installing a blade holding ring assembly into the inner cylinder assembly, and performing detection and debugging of the blade holding ring assembly; Step S3: installing a rotor into the blade holding ring assembly, and performing detection and debugging of the rotor; Step S4: installing a wheel spacer into a rotor coupling flange, and performing detection and debugging of the wheel spacer and the rotor coupling flange. The method for offline assembly of a turbine cylinder flow-through component enables its adjustment data to be directly used for on-site installation, thereby reducing the workload of on-site installation. During the assembly process, equipment quality problems can be discovered and handled in advance, thereby avoiding problems in the on-site formal installation that affect the implementation of the transformation.

Description

Technical Field

[0001] The invention relates to the field of nuclear power plant operation modification, and in particular to a method for off-line assembly of turbine cylinder flow-through components. Background Art

[0002] The transformation of the low-pressure cylinder of the steam turbine at Daya Bay Nuclear Power Plant refers to the conventional methods of the industry. The outer cylinder connected to the external interface such as the civil foundation is retained and replaced. The remaining inner cylinder, holding ring, rotor, bearing, expansion joint, thermal instrument probe and other multiple components are all replaced. Due to the large scope and complex interfaces involved in the transformation, there are risks such as equipment size errors, interface mismatches between new components, interface mismatches between new and old components, and installation interference. According to the experience of steam turbine transformation at home and abroad, the probability of such risks is high, and only temporary measures can be formulated passively according to actual problems. However, the on-site machining conditions are limited, the processing is difficult, and it may even be necessary to return to the factory for reprocessing, and the delayed construction period will be measured in weeks. Nuclear power plants have strict control over the overhaul period. If the construction period is delayed due to the transformation, it will have a great impact on power generation revenue and WANO indicators, and may also have a certain impact on social public opinion. Therefore, it is necessary to consider the verification means of offline assembly, actively discover and deal with equipment problems, minimize the risk of transformation implementation during the overhaul, shorten the construction period, and improve quality.

[0003] Due to the large size of the steam turbine low-pressure cylinder equipment and the weight of a single rotor exceeding 60 tons, offline assembly is difficult and increases project costs. Currently, there is no precedent for offline assembly of low-pressure cylinder inner cylinder, retaining ring and other stationary parts with the rotor as a whole in domestic and foreign steam turbine factories and power plants. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for off-line assembly of flow-through components of a steam turbine cylinder.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for offline assembly of a steam turbine cylinder flow-through component, which is used to simulate the on-site installation state of the steam turbine and realize the detection and debugging of the cylinder flow-through component, wherein the cylinder flow-through component includes an inner cylinder assembly, a blade holding ring assembly, a rotor, a wheel spacer and a rotor coupling flange, and comprises the steps of:

[0006] Step S1: constructing an assembly mechanism, installing the inner cylinder assembly on the assembly mechanism, and performing position adjustment of the assembly mechanism and detection and adjustment of the inner cylinder assembly, and using steel plates and concrete to ensure the foundation strength of the assembly mechanism, and setting up a dial indicator to continuously monitor whether the foundation has settled;

[0007] Step S2: installing the blade ring holding assembly into the inner cylinder assembly, and performing inspection and debugging of the blade ring holding assembly;

[0008] Step S3: installing the rotor into the blade holding ring assembly, and performing inspection and debugging of the rotor;

[0009] Step S4: Install the wheel spacer plate into the rotor coupling flange, and perform inspection and debugging of the wheel spacer plate and the rotor coupling flange.

[0010] In some embodiments, the assembly mechanism includes a cylinder support frame and two rotor support frames arranged on both sides of the cylinder support frame, and the rotor support frame is provided with a tooling bearing;

[0011] The cylinder support frame is used to replace the outer cylinder that cannot be removed on site, simulate the on-site installation conditions, support and adjust the inner cylinder assembly at a position and elevation approximately the same as on site, and verify the interface dimensions between the new inner cylinder and the old outer cylinder;

[0012] The tooling bearing is used to replace the bearing that cannot be removed on site, simulates the on-site installation conditions, and supports the rotor at approximately the same position and elevation as on site, so that the rotor does not interfere with the blade holding ring assembly that has been preliminarily adjusted, and can be further adjusted according to the dynamic and static clearance measurement values.

[0013] In some embodiments, the inner cylinder assembly includes an inner cylinder lower half petal and an inner cylinder upper half petal;

[0014] The step S1 comprises:

[0015] Step S11: installing the assembly mechanism at a preset position, placing the lower half of the inner cylinder on the cylinder support frame, placing the two tooling bearings on the two rotor support frames respectively, and making a rough adjustment of the relative positions of the lower half of the inner cylinder and the tooling bearings;

[0016] Step S12: using a tool to adjust the positions of the lower half of the inner cylinder and the two tooling bearings;

[0017] Step S13: installing the upper half of the inner cylinder, and measuring the gap between the lower half of the inner cylinder and the upper half of the inner cylinder with a feeler gauge;

[0018] Step S14: remove the upper half of the inner cylinder.

[0019] In some embodiments, step S12 includes:

[0020] Step S121: using a level to adjust the center planes of the two tooling bearings to be horizontal and at the same height;

[0021] Step S122: using a steel wire to adjust the inner cylinder lower half disc to be concentric with the steel wire, and at the same time adjusting the axial relative position of the inner cylinder lower half disc and the two tooling bearings;

[0022] Step S123: using a laser tracker to measure and adjust the coaxiality between the inner circles of the two tooling bearings, and adjusting the inner circles of the flanges at both ends of the lower half of the inner cylinder to be concentric with the inner circles of the two tooling bearings;

[0023] Step S124: Use a dial indicator to monitor the lowest points of the flanges at both ends of the lower half of the inner cylinder to detect the foundation settlement of the cylinder support frame.

[0024] In some embodiments, the blade holding ring assembly includes a blade holding ring sealing ring, a support plate, a support gasket, a blade holding ring lower half petal and a blade holding ring upper half petal, and the blade holding ring lower half petal and the blade holding ring upper half petal are interconnected to form a blade holding ring body.

[0025] In some embodiments, step S2 includes:

[0026] Step S21: installing the blade holding ring sealing ring, the supporting plate, the supporting gasket and the lower half of the blade holding ring in sequence, and performing a blue oil contact inspection;

[0027] Step S22: installing the upper half of the blade holding ring, and checking the fitting clearance between the upper half of the blade holding ring and the lower half of the blade holding ring;

[0028] Step S23: measuring the gap between the bottom of the lower half of the blade holding ring and the bottom of the lower half of the inner cylinder and the expansion gap between the lower half of the blade holding ring and the pressure surface of the lower half of the inner cylinder;

[0029] Step S24: After installing the steel wire, adjust the steel wire to be concentric with the two tooling bearings, and measure the height difference between the petal surface of the inner cylinder and the petal surface of the blade holding ring body, and the radial clearance between the inner circle of the inner cylinder ring plate and the outer circle of the blade holding ring body.

[0030] In some embodiments, step S2 further includes:

[0031] Step S25: adjusting the thickness of the support gasket, placing the first lead wire on the support plate, and placing the second lead wire on the petal surface of the sealing ring of the blade ring holding body;

[0032] Step S26: insert the upper half of the inner cylinder, so that the lead wire is deformed, and then remove the upper half of the inner cylinder to measure the thickness of the lead wire at various locations;

[0033] Step S27: Arrange third lead wires at the top and bottom of the blade ring holding body respectively.

[0034] In some embodiments, step S3 includes:

[0035] Step S31: placing the rotor on the two tooling bearings, and installing the rotor to a preset position of the lower half of the blade holding ring;

[0036] Step S32: measuring the gap between the rotor and the lower half of the blade holding ring, measuring the thickness of the third lead wire at the top and bottom of the blade holding ring, and adjusting the relative position between the rotor and the lower half of the blade holding ring;

[0037] Step S33: installing the upper half of the blade holding ring and the upper half of the inner cylinder, and measuring the positioning reference dimension of the rotor axial flow;

[0038] Step S34: sequentially disassemble the inner cylinder upper disc, the blade holding ring upper disc, the rotor, the blade holding ring lower disc, the inner cylinder lower disc, the bearing support block and the inner cylinder support block, and mark the cylinder flow components to avoid mixing.

[0039] In some embodiments, in the step S32, if the relative position between the rotor and the lower half of the blade holding ring does not match the preset position, the step S25 is performed;

[0040] If the relative position between the rotor and the lower half of the blade holding ring matches the preset position, step S33 is performed.

[0041] In some embodiments, step S4 includes:

[0042] Step S41: arranging the wheel spacer plate on the rotor coupling flange;

[0043] Step S42: using a knife edge gauge and a feeler gauge to check and adjust the concentricity between the outer circle of the wheel spacer and the outer circle of the rotor coupling flange, and adjusting the position of the wheel spacer;

[0044] Step S43: Check the misalignment between the pre-hole of the rotor coupling flange and the pre-hole of the wheel spacer plate and make adjustments;

[0045] Step S44: remove the wheel spacer plates, remove hair, clean and oil seal.

[0046] The implementation of the present invention has the following beneficial effects: the method for offline assembly of the flow-through components of the steam turbine cylinder adopts a cylinder support frame to replace the outer cylinder that cannot be removed on site, so as to verify the interface size between the new inner cylinder and the old outer cylinder, and adopts a tooling bearing to replace the bearing that cannot be removed on site to support the rotor, so that the adjustment data of the offline assembly of the flow-through components of the steam turbine cylinder can be directly used for on-site installation and use, thereby reducing the workload of on-site installation. During the assembly process, equipment quality problems can be discovered and handled in advance, and important dimensional deviations can be processed secondary to avoid disruptive problems in the on-site formal installation that affect the implementation of the transformation. Through offline assembly, it is equivalent to completing part of the on-site installation work in advance, saving on-site construction time, and having obvious economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0048] Figure 1 is a structural schematic diagram of an off-line assembly mechanism for a flow-through component of a steam turbine cylinder in some embodiments of the present invention;

[0049] Figure 2 is a schematic diagram of the structure of detecting a blade holding ring assembly in some embodiments of the present invention;

[0050] Figure 3 is a schematic diagram of the structure of detecting a rotor in some embodiments of the present invention;

[0051] Figure 4 is a schematic structural diagram of the blade ring holder assembly in some embodiments of the present invention;

[0052] Figure 5 It is a schematic structural diagram of the assembly of the lower half of the blade holding ring and the lower half of the inner cylinder in some embodiments of the present invention;

[0053] Figure 6 is a general flow chart of steps of an off-line assembly method of a steam turbine cylinder flow-through component in some embodiments of the present invention;

[0054] Figure 7 is a flow chart of step S1 of an off-line assembly method of a steam turbine cylinder flow-through component in some embodiments of the present invention;

[0055] Figure 8 is a flow chart of step S2 of the off-line assembly method of a steam turbine cylinder flow-through component in some embodiments of the present invention;

[0056] Fig. 9is a flow chart of step S3 of the off-line assembly method of a steam turbine cylinder flow-through component in some embodiments of the present invention;

[0057] Fig.10 It is a flow chart of step S4 of the off-line assembly method of the turbine cylinder flow-through components in some embodiments of the present invention. DETAILED DESCRIPTION

[0058] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0059] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0060] See also Figures 1 to 3 , is an off-line assembly device for a steam turbine cylinder flow component in some embodiments of the present invention, which is used to simulate the on-site installation state of a steam turbine and realize the detection and debugging of the cylinder flow component. The cylinder flow component includes an inner cylinder component 2, a blade holding ring component 3, a rotor 4, a wheel spacer and a rotor coupling flange, such as Figure 6 As shown, the method for offline assembly of the turbine cylinder flow-through components comprises the following steps:

[0061] Step S1: construct the assembly mechanism 1, install the inner cylinder assembly 2 on the assembly mechanism 1, and perform position debugging of the assembly mechanism 1 and detection and debugging of the inner cylinder assembly 2, and use steel plates and concrete to ensure the foundation strength of the assembly mechanism, and set up a dial indicator to continuously monitor whether the foundation has settled;

[0062] Step S2: installing the blade ring holding assembly 3 into the inner cylinder assembly 2, and performing inspection and debugging of the blade ring holding assembly 3;

[0063] Step S3: installing the rotor 4 into the blade holding ring assembly 3, and performing inspection and debugging of the rotor 4;

[0064] Step S4: installing the wheel spacer into the rotor coupling flange, and performing inspection and debugging of the wheel spacer and the rotor coupling flange;

[0065] Among them, the assembly mechanism 1 includes a cylinder support frame 11 and two rotor support frames 12 arranged on both sides of the cylinder support frame 11. The rotor support frame 12 is provided with a tooling bearing 121. The cylinder support frame 11 is used to replace the outer cylinder that cannot be removed on site, simulate the on-site installation conditions, support and adjust the inner cylinder assembly at approximately the same position and elevation as on site, and realize the verification of the interface size between the new inner cylinder and the old outer cylinder. The tooling bearing 121 is used to replace the bearing that cannot be removed on site, simulate the on-site installation conditions, support the rotor 4 at approximately the same position and elevation as on site, so that the rotor 4 does not interfere with the blade holding ring assembly that has been preliminarily adjusted, and can be further adjusted according to the dynamic and static clearance measurement values.

[0066] Understandably, the offline assembly method of the turbine cylinder flow-through components simulates the support position and support method of the outer cylinder on site for the inner cylinder, supports the inner cylinder, avoids the cylinder deformation caused by the different support positions between the offline assembly and the actual installation on site, and the different openings of the center surface after the upper and lower petals of the inner cylinder are closed, which causes deviations in the measurement results. The adjustment data can be directly used for on-site installation, reducing the workload of on-site installation by about 1 / 3. During the assembly process, equipment quality problems can be discovered and dealt with in advance, avoiding disruptive problems in the formal on-site installation that affect the implementation of the transformation. And through offline assembly, it is equivalent to completing part of the on-site installation work in advance, saving on-site construction time. Although the construction of the offline assembly platform and the input of personnel will incur certain costs, compared with the power generation benefits, it is still obviously economical.

[0067] The inner cylinder assembly 2 includes an inner cylinder lower half and an inner cylinder upper half. Figure 7 As shown, the step S1 may include: step S11: installing the assembly mechanism 1 at a preset position, placing the lower half of the inner cylinder on the cylinder support frame 11, placing two tooling bearings 121 on two rotor support frames 12 respectively, and making a rough adjustment of the relative positions of the lower half of the inner cylinder and the tooling bearings 121;

[0068] Step S12: using a tool to adjust the positions of the lower half of the inner cylinder and the two tooling bearings 121;

[0069] Step S13: Install the upper half of the inner cylinder and use a feeler gauge to measure the gap between the lower half of the inner cylinder and the upper half of the inner cylinder;

[0070] Step S14: Remove the upper half of the inner cylinder.

[0071] Specifically, in step S11, first clean the assembly site, mark the position line of the cylinder support frame 11 and the position line of the rotor support frame 12 on the assembly platform, mark the axial center line and the inner cylinder center line, and install the cylinder support frame 11, the rotor support frame 12 and the wire drawing support according to the marked position. In this embodiment, the number of the cylinder support frames 11 is 4, the number of the rotor support frames 12 is 2, and the number of the wire drawing support is 2. In some other embodiments, the number can be adjusted according to the actual situation, and no specific limitation is made here. Further, the center line of the rotor support frame 12, the center line of the cylinder support frame 11 and the center line of the wire drawing support are all on the same straight line. Further, other operating components and safety protection fences are installed on the assembly platform, and then two tooling bearings 121 are installed on the rotor support frame 12, and the relative positions of the two tooling bearings 121 are roughly adjusted.

[0072] Then install the lower half of the inner cylinder so that the petal surface of the inner cylinder faces upward, roughly adjust the radial position and axial position of the lower half of the inner cylinder, optimize the settings of other operating components and safety protection fences according to the installation position of the lower half of the inner cylinder, then install the wire pulling bracket and special tools, and roughly adjust the relative position of the wire pulling bracket.

[0073] In some embodiments, step S12 includes:

[0074] Step S121: Use a level to adjust the dividing surfaces of the two tooling bearings 121 to be horizontal and at the same height;

[0075] Step S122: Use the steel wire to adjust the lower half of the inner cylinder to be concentric with the steel wire, and adjust the axial relative position of the lower half of the inner cylinder and the two tooling bearings 121 at the same time;

[0076] Step S123: using a laser tracker to measure and adjust the coaxiality between the inner circles of the two tooling bearings 121, and to adjust the inner circles of the flanges at both ends of the lower half of the inner cylinder to be concentric with the inner circles of the two tooling bearings 121;

[0077] Step S124: Use a dial indicator to monitor the lowest points of the flanges at both ends of the lower half of the inner cylinder to detect the foundation settlement of the cylinder support frame 11.

[0078] Specifically, in step S122, when adjusting the axial position of the tooling bearing 121, use a steel wire to measure the distance between the steel wire and the inner circle of the tooling bearing 121, and adjust the concentricity between the inner circle of the tooling bearing 121 and the steel wire. Then, adjust the petal surface of the inner cylinder to be horizontal and flush with the reference plane of the tooling bearing 121, measure the distance between the inner circle of the flange at both ends of the inner cylinder and the steel wire, and then adjust the communication between the inner circle of the flange at both ends of the inner cylinder and the steel wire. Then, adjust the axial relative position between the inner cylinder and the tooling bearing 121, and finally remove the steel wire.

[0079] Among them, in step S124, the dial indicator is pre-installed at the bottom of the assembly platform, and it is used to detect the settlement of the assembly platform foundation. The settlement of the assembly platform occurs because the weight of the equipment borne by the assembly platform increases during the offline assembly of the turbine cylinder flow components. If settlement occurs, it will affect the actual measurement.

[0080] Specifically, in step S13, the petal surface of the upper petal of the inner cylinder is first deburred, trimmed and cleaned, the upper petal of the inner cylinder is installed using the guide studs, and then the positioning pins are installed. After the wire rope is loosened, a 0.04mm thick feeler gauge is used to detect the gap between the upper petal of the inner cylinder and the lower petal of the inner cylinder from the outside and inside of the inner cylinder as a whole. It is required that the feeler gauge must not be inserted. If the feeler gauge cannot be inserted, execute step S14.

[0081] If it can be inserted, record the insertion position and insertion length, then use studs and nuts to close the two halves, tighten 1 / 3 of the nuts, and use a 0.04mm thick feeler gauge to check the gap between the upper half of the inner cylinder and the lower half of the inner cylinder again. If it cannot be inserted, tighten all the nuts. If it can be inserted, perform additional processing.

[0082] In some embodiments, the blade holding ring assembly 3 includes a blade holding ring sealing ring, a support plate, a support gasket, a blade holding ring lower half petal and a blade holding ring upper half petal, and the blade holding ring lower half petal and the blade holding ring upper half petal are interconnected to form a blade holding ring body.

[0083] like Figure 8 As shown, step S2 includes:

[0084] Step S21: Install the blade holding ring sealing ring, the support plate, the support gasket and the lower half of the blade holding ring in sequence, and perform a blue oil contact inspection;

[0085] Step S22: installing the upper half of the blade holding ring, and checking the fitting clearance between the upper half of the blade holding ring and the lower half of the blade holding ring;

[0086] Step S23: measuring the gap between the bottom of the lower half of the blade holding ring and the bottom of the lower half of the inner cylinder and the expansion gap between the lower half of the blade holding ring and the pressure surface of the lower half of the inner cylinder;

[0087] Step S24: After installing the steel wire, adjust the steel wire to be concentric with the two tooling bearings 121, and measure the height difference between the petal surface of the inner cylinder and the petal surface of the blade holding ring body, and the radial clearance between the inner circle of the inner cylinder ring plate and the outer circle of the blade holding ring body.

[0088] Specifically, in step S21, the guide angles are firstly grinded at the multiple notches of the positioning groove of the lower half of the inner cylinder, and then the blade retaining ring sealing ring is installed and the multiple locations of the petal surface of the lower half of the inner cylinder are grinded, and then the groove depth dimensions on both sides of the positioning groove of the lower half of the inner cylinder are measured and a support gasket of suitable thickness is selected. The thickness of the support gasket is between 0.05 mm above and below the groove depth dimensions on both sides of the positioning groove of the lower half of the inner cylinder, such as Figure 5 As shown, the depth of the two sides of the positioning groove of the lower half of the inner cylinder is H, and the thickness of the support gasket is h. Then install the support plate, support gasket and the lower half of the blade holding ring and fix them with screws. In this embodiment, the number of the blade holding ring bodies is four, and the blade holding ring bodies can be divided into two groups of equal numbers. The two blade holding ring bodies close to the center line of the inner cylinder are the first group of blade holding ring bodies, and the two blade holding ring bodies away from the center line of the inner cylinder are the second group of blade holding ring bodies.

[0089] Furthermore, in the blue oil contact inspection, blue oil is first applied to the support disc plane, and the lower half of the first set of blade ring holders is set on the lower half of the inner cylinder, so that the petal surface of the lower half of the blade ring holder is parallel to the petal surface of the lower half of the inner cylinder, and the radial clearance is uniform. Then the first set of blade ring holders are hoisted out, and the blue oil contact between the support disc and the inner cylinder support surface is checked, photographed and recorded, and the inner cylinder support surface is polished according to the actual situation. Similarly, the second set of blade ring holders are also inspected for blue oil contact using the above method.

[0090] Specifically, in step S22, after completing the above-mentioned blue oil contact inspection, the width of the positioning groove of the lower half of the inner cylinder is measured. Figure 4 As shown, the width of the positioning groove of the lower half of the inner cylinder is size E, and then the blade holding ring sealing ring, support plate and support gasket are re-installed in sequence, so that the gaps on both sides of the bottom of the lower half of the blade holding ring are close to the bottom of the lower half of the inner cylinder, and then the lower half of the blade holding ring is installed, the positioning pin is installed, and after loosening the wire rope, a 0.04mm thick feeler gauge is used to check the fitting gap between the upper half of the blade holding ring and the blade holding ring from the outside and inside of the blade holding ring body, and it is required that it must not be inserted.

[0091] If it can be inserted, record the insertion position and insertion length, then use studs and nuts to close the two petals, tighten all nuts, and use a 0.04mm thick feeler gauge to check the fitting gap between the upper half of the blade holding ring and the lower half of the blade holding ring again. If it cannot be inserted, tighten all nuts. If it can be inserted, perform additional processing.

[0092] Among them, in step S23, if Figure 4As shown, the gap between the bottom of the lower half of the blade holding ring and the bottom of the lower half of the inner cylinder on the left side is dimension B, and the gap on the right side is dimension C. First, use a dial indicator to monitor, and use the horizontal translation method to measure and record the sum of dimensions B and C, then translate the blade holding ring body, so that the value of dimension B is 0, and then remove the upper half of the blade holding ring. Further, other blade holding ring bodies also use the above method to record the values ​​of dimensions B and C. After completing the above steps, tighten the lower half of each blade holding ring from the center to both sides, and measure the expansion gap between the lower half of the blade holding ring and the pressure surface of the lower half of the inner cylinder.

[0093] Furthermore, in step S24, the steel wire is first reinstalled, and the position of the steel wire is measured and adjusted so that the steel wire is concentric with the inner circles of the two tooling bearings 121, and the distance from the inner circle of the blade holding ring body to the steel wire, the height difference between the inner cylinder petal surface and the blade holding ring body petal surface, and the radial clearance between the inner circle of the inner cylinder ring plate and the outer circle of the blade holding ring body are measured in sequence; based on the above-mentioned inspection results of the blue oil and the measurement data, the position of the inner cylinder assembly 2 and the blade holding ring body is adjusted.

[0094] Specifically, step S2 also includes:

[0095] Step S25: After adjusting the thickness of the support gasket, place the first lead wire on the support plate, and place the second lead wire on the petal surface of the sealing ring of the blade ring holder;

[0096] Step S26: insert the upper half of the inner cylinder, so that the lead wire is deformed, and then remove the upper half of the inner cylinder to measure the thickness of the lead wire at various locations;

[0097] Step S27: Arrange the third lead wire on the top and bottom of the blade ring holding body respectively.

[0098] Among them, in step S25, first measure the height difference between the support plate plane and the inner cylinder petal surface, then adjust the thickness of the support gasket according to the height difference, and then install the support plate, gasket, blade holding ring lower petal and blade holding ring upper petal in sequence, check the fitting gap between the blade holding ring lower petal and the blade holding ring upper petal, check the reading of the dial indicator and record it. Furthermore, the diameter of the first lead wire is 0.5 mm, and the diameter of the second lead wire is 2.5 mm.

[0099] In step S26, after the upper half of the inner cylinder is installed, the gap between the upper half of the inner cylinder and the upper half of the inner cylinder is checked, the distance from the inner circle of the blade holding ring to the steel wire is measured, and then the upper half of the inner cylinder is removed, and the thickness of the lead wire installed in step S25 is measured. It can be understood that the gap measurement of the lead wire utilizes the weight of the upper half of the inner cylinder after it is installed to deform the lead wire. By measuring the diameter of the deformed lead wire, it is possible to know the gap where the lead wire is arranged.

[0100] In step S27, a third lead wire is arranged at the top and bottom of the blade holding ring body respectively. The diameter of the third lead wire is selected to be 1.5 to 2 times the designed gap between the top and bottom of the blade holding ring body and the inner cylinder. The sides of the third lead wire are fixed with tape.

[0101] like Figure 8 As shown, step S3 includes:

[0102] The step S31: placing the rotor 4 on the two tooling bearings 121, and installing the rotor 4 to the preset position of the lower half of the blade holding ring;

[0103] Step S32: measuring the gap between the rotor 4 and the lower half of the blade holding ring, measuring the thickness of the third lead wire at the top and bottom of the blade holding ring, and adjusting the relative position between the rotor 4 and the lower half of the blade holding ring;

[0104] Step S33: installing the upper half of the blade holding ring and the upper half of the inner cylinder, and measuring the positioning reference size of the rotor axial flow and the anti-jump clearance between the lower half of the blade holding ring and the lower half of the inner cylinder;

[0105] Step S34: sequentially disassemble the upper half of the inner cylinder, the upper half of the blade holding ring, the rotor 4, the lower half of the blade holding ring, the lower half of the inner cylinder, the bearing support block and the inner cylinder support block, and mark the cylinder flow components to avoid mixing.

[0106] Specifically, in step S31, first check and clean the inner circle of the tool bearing 121, apply a proper amount of lubricating oil to the inner circle surface, use tools to lift the rotor 4, check and adjust the relative position between the rotor 4 and the blade ring holder, install and adjust the guide support position, slowly lower the rotor 4, check the relative position between the rotor 4 and the blade ring holder again, adjust the guide support position according to the actual situation, slowly place the rotor 4 on the tool bearing 121, and check and record the readings of each monitoring dial indicator. It can be understood that the positioning reference size of the rotor axial flow can be used for comparison when going to the site for formal installation.

[0107] In step S32, if the relative position between the rotor and the lower half of the blade holding ring does not match the preset position, step S25 is performed; if the relative position between the rotor and the lower half of the blade holding ring matches the preset position, step S33 is performed.

[0108] In step S33, the anti-jump gap between the lower half of the blade holding ring and the lower half of the inner cylinder is as follows: Figure 5 If the anti-jump gap is too small, the lower half of the blade holding ring and the lower half of the inner cylinder will be pressed against each other.

[0109] like Fig.10 As shown, step S4 includes:

[0110] Step S41: placing the wheel spacer on the rotor coupling flange;

[0111] Step S42: using a knife edge gauge and a feeler gauge to check and adjust the concentricity between the outer circle of the wheel spacer and the outer circle of the rotor coupling flange, and adjusting the position of the wheel spacer;

[0112] Step S43: Check the misalignment between the pre-hole of the rotor coupling flange and the pre-hole of the counter-wheel spacer plate and make adjustments;

[0113] Step S44: remove the wheel spacer, remove the hair, clean and oil seal.

[0114] The pair of wheel spacers and the rotor coupling flange are both provided with pre-holes, and the size of the pre-holes is 24 mm in diameter. In step S41, the pair of wheel spacers are assembled to the rotor coupling flange and fixed with tools.

[0115] Specifically, in step S42, a knife-edge gauge and a feeler gauge are used to check and adjust the concentricity error between the outer circle of the wheel spacer and the outer circle of the rotor coupling flange, so that the concentricity error does not exceed 0.02 mm. At the same time, a knife-edge gauge is used to check and adjust the inner circle surface of the coupling hole of the wheel spacer to not be higher than the rotor coupling flange, and then the concentricity between the outer circle of the wheel spacer and the outer circle of the rotor coupling flange is rechecked.

[0116] In step S43, check the misalignment between the pre-holes of the rotor coupling flange and the pre-holes of the wheel spacer plate. Using the pre-holes on the wheel spacer plate as a reference, use a magnetic drill to drill φ25.4H7 locating pin holes, and ream through the wheel spacer plate and the rotor coupling flange. If the pin hole diameter is too large, a locating pin should be provided to ensure assembly requirements.

[0117] Wherein, after step S4, the method further includes step S5: checking the cleanliness of cylinder flow-through components, and performing oil sealing, protection and packaging.

[0118] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A method for offline assembly of a steam turbine cylinder flow-through component, used to simulate the on-site installation state of a steam turbine and realize the detection and debugging of the cylinder flow-through component, characterized in that: Includes steps: Step S1: constructing an assembly mechanism (1), installing an inner cylinder assembly (2) onto the assembly mechanism (1), and performing position adjustment of the assembly mechanism (1) and detection and adjustment of the inner cylinder assembly (2), and using steel plates and concrete to ensure the foundation strength of the assembly mechanism (1), and setting up a dial indicator to continuously monitor whether the foundation has settled; Step S2: installing the blade ring holding assembly (3) into the inner cylinder assembly (2), and performing inspection and debugging of the blade ring holding assembly (3); Step S3: installing the rotor (4) into the blade holding ring assembly (3), and performing inspection and debugging of the rotor (4); Step S4: installing the wheel spacer plate into the rotor coupling flange, and performing inspection and debugging of the wheel spacer plate and the rotor coupling flange; The assembly mechanism (1) comprises a cylinder support frame (11) and two rotor support frames (12) arranged on both sides of the cylinder support frame (11), and the rotor support frames (12) are provided with tooling bearings (121); The cylinder support frame (11) is used to replace the outer cylinder that cannot be removed on site, simulate the on-site installation conditions, support and adjust the inner cylinder assembly (2) at a position and elevation approximately the same as on site, and verify the interface dimensions of the new inner cylinder and the old outer cylinder; The tooling bearing (121) is used to replace a bearing that cannot be removed on site, simulates on-site installation conditions, and supports the rotor (4) at a position and elevation approximately the same as on site, so that the rotor (4) does not interfere with the preliminarily adjusted blade holding ring assembly (3), and can be further adjusted according to the dynamic and static clearance measurement value; The inner cylinder assembly (2) comprises an inner cylinder lower half and an inner cylinder upper half; The step S1 comprises: Step S11: installing the assembly mechanism (1) at a preset position, arranging the lower half of the inner cylinder on the cylinder support frame (11), arranging the two tooling bearings (121) on the two rotor support frames (12), and performing a rough adjustment of the relative positions of the lower half of the inner cylinder and the tooling bearings (121); Step S12: using a tool to adjust the positions of the lower half of the inner cylinder and the two tooling bearings (121); Step S13: installing the upper half of the inner cylinder, and measuring the gap between the lower half of the inner cylinder and the upper half of the inner cylinder with a feeler gauge; Step S14: remove the upper half of the inner cylinder.

2. The method for off-line assembly of a steam turbine cylinder flow component according to claim 1, characterized in that: The step S12 comprises: Step S121: using a level gauge to adjust the center dividing surfaces of the two tooling bearings (121) to be horizontal and at the same height; Step S122: using a steel wire to adjust the inner cylinder lower half disc to be concentric with the steel wire, and at the same time adjusting the axial relative position of the inner cylinder lower half disc and the two tooling bearings (121); Step S123: using a laser tracker to measure and adjust the coaxiality between the inner circles of the two tooling bearings (121), and adjusting the inner circles of the flanges at both ends of the lower half of the inner cylinder to be concentric with the inner circles of the two tooling bearings (121); Step S124: using a dial indicator to monitor the lowest points of the flanges at both ends of the lower half of the inner cylinder to detect the foundation settlement of the cylinder support frame (11).

3. The method for off-line assembly of a steam turbine cylinder flow component according to claim 1, characterized in that: The blade holding ring assembly (3) comprises a blade holding ring sealing ring, a support plate, a support gasket, a blade holding ring lower half petal and a blade holding ring upper half petal, wherein the blade holding ring lower half petal and the blade holding ring upper half petal are connected to each other to form a blade holding ring body.

4. The method for off-line assembly of a steam turbine cylinder flow component according to claim 3, characterized in that: The step S2 comprises: Step S21: installing the blade holding ring sealing ring, the supporting plate, the supporting gasket and the lower half of the blade holding ring in sequence, and performing a blue oil contact inspection; Step S22: installing the upper half of the blade holding ring, and checking the fitting clearance between the upper half of the blade holding ring and the lower half of the blade holding ring; Step S23: measuring the gap between the bottom of the lower half of the blade holding ring and the bottom of the lower half of the inner cylinder and the expansion gap between the lower half of the blade holding ring and the pressure surface of the lower half of the inner cylinder; Step S24: After installing the steel wire, adjust the steel wire to be concentric with the two tooling bearings (121), and measure the height difference between the petal surface of the inner cylinder and the petal surface of the blade holding ring body, and the radial clearance between the inner circle of the inner cylinder ring plate and the outer circle of the blade holding ring body.

5. The method for off-line assembly of a steam turbine cylinder flow component according to claim 4, characterized in that: The step S2 further comprises: Step S25: adjusting the thickness of the support gasket, installing the upper half of the blade holding ring, placing the first lead wire on the support plate, and placing the second lead wire on the petal surface of the sealing ring of the blade holding ring body; Step S26: insert the upper half of the inner cylinder, so that the lead wire is deformed, and then remove the upper half of the inner cylinder to measure the thickness of the lead wire at various locations; Step S27: Arrange third lead wires at the top and bottom of the blade ring holding body respectively.

6. The method for off-line assembly of a steam turbine cylinder flow component according to claim 5, characterized in that: The step S3 comprises: Step S31: placing the rotor (4) on the two tooling bearings (121), and installing the rotor (4) to a preset position of the lower half of the blade holding ring; Step S32: measuring the gap between the rotor (4) and the lower half of the blade holding ring, measuring the thickness of the third lead wire at the top and bottom of the blade holding ring, and adjusting the relative position between the rotor (4) and the lower half of the blade holding ring; Step S33: installing the upper half of the blade holding ring and the upper half of the inner cylinder, and measuring the positioning reference dimension of the rotor axial flow and the anti-jump gap between the lower half of the blade holding ring and the lower half of the inner cylinder; Step S34: sequentially disassemble the inner cylinder upper disc, the blade holding ring upper disc, the rotor, the blade holding ring lower disc, the inner cylinder lower disc, the bearing support block and the inner cylinder support block, and mark the cylinder flow components to avoid mixing.

7. The method for off-line assembly of a steam turbine cylinder flow component according to claim 6, characterized in that: In the step S32, if the relative position between the rotor and the lower half of the blade holding ring does not match the preset position, then the step S25 is performed; If the relative position between the rotor and the lower half of the blade holding ring matches the preset position, step S33 is performed.

8. The method for off-line assembly of a steam turbine cylinder flow component according to claim 6, characterized in that: The step S4 comprises: Step S41: arranging the wheel spacer plate on the rotor coupling flange; Step S42: using a knife edge gauge and a feeler gauge to check and adjust the concentricity between the outer circle of the wheel spacer and the outer circle of the rotor coupling flange, and adjusting the position of the wheel spacer; Step S43: Check the misalignment between the pre-hole of the rotor coupling flange and the pre-hole of the wheel spacer plate and make adjustments; Step S44: remove the wheel spacer plates, remove hair, clean and oil seal.

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