Cylinder cat's claw support structure, steam turbine and steam turbine stability verification method

Abstract

The present application relates to the technical field of industrial steam turbine design, and in particular to a cylinder cat's claw support structure, a steam turbine and a method for checking the stability of a steam turbine. The cylinder cat's claw support structure includes a cat's claw, a distance connection piece and a clamping assembly; the cat's claw is arranged at the center plane of the cylinder, and the cat's claw is connected to the cylinder through the distance connection piece; the clamping assembly is detachably arranged on the side of the cat's claw that is away from the center plane, and the clamping assembly can use the distance connection piece as a fulcrum to clamp the cat's claw toward the center plane. The steam turbine includes the steam turbine cat's claw support structure. The method for checking the stability of the steam turbine is used to check the stability of the steam turbine including the cylinder cat's claw support structure. The cylinder cat's claw support structure, the steam turbine and the method for checking the stability of the steam turbine can prevent the cat's claw from deviating from the center plane and being unable to recover after leaving the factory during the design stage, and can also prevent the steam turbine from easily tipping over during use.

Description

Technical Field

[0001] The present application relates to the technical field of industrial steam turbine design, and in particular to a cylinder cat's claw support structure, a steam turbine and a method for checking the stability of a steam turbine. Background Art

[0002] The turbine cylinder is connected to many pipes, one type of which is internal pipes, such as balance pipes, overflow pipes, etc., and the other type of pipes is external pipes, such as new steam pipes, supplementary steam pipes, extraction pipes and exhaust pipes, etc. Due to thermal expansion and contraction, the pipes generate forces and torques, which are transmitted to the cylinder itself through the cylinder interface connected to them. At the same time, the dead weight of the pipes themselves and the reaction force of the brackets will also generate additional forces and torques.

[0003] For the turbine cylinder, such external forces and external moments will have a great impact on its stability, causing adverse conditions such as cylinder lifting, overturning, translation, and cylinder and pipe vibration caused by thermal expansion obstruction.

[0004] In order to ensure that the cylinder can expand freely after being heated, the support and positioning of the cylinder is the key in the unit design. At present, the cat's claw support structure is widely used, so that the turbine can be stably seated on the frame whether in the installation state or the operation state, thereby ensuring that the turbine cylinder has good stability.

[0005] However, once the current cat's claw support structure is installed before the cylinder leaves the factory, its structure cannot be adjusted. Therefore, after leaving the factory, after the cylinder is installed on the frame through the cat's claw support structure, the cat's claw support structure installed before leaving the factory may push against the cylinder due to reasons such as the installation site or transportation, causing the cat's claw support structure to deviate from the center dividing plane and be unable to recover. Summary of the invention

[0006] The purpose of the present application is to provide a cylinder cat's claw support structure, a steam turbine and a method for checking the stability of a steam turbine, so as to solve the technical problem in the prior art that the cat's claw support structure after leaving the factory cannot be restored after deviating from the center dividing plane to a certain extent.

[0007] The present application provides a cylinder cat claw support structure, including a cat claw, a distance connection piece and a clamping assembly;

[0008] The cat's claw is arranged at the center plane of the cylinder through a distance connection piece;

[0009] The pressing assembly is used to be detachably arranged on a side of the cat's claw away from the middle dividing surface, and the pressing assembly can press the cat's claw toward the middle dividing surface with the distance connecting piece as a fulcrum.

[0010] In the above technical solution, further, the distance connecting member is a distance bolt, the cat claw is provided with a connecting through hole, the distance bolt passes through the connecting through hole and is screwed to the center dividing surface of the cylinder, a circumferential gap is formed between the distance bolt and the connecting through hole, and a predetermined gap is formed between the nut of the distance bolt and the surface of the cat claw facing away from the center dividing surface through a clamping assembly.

[0011] In any of the above technical solutions, further, the clamping assembly includes two disc springs detachably sleeved on the distance bolt, and the two disc springs are located between the nut of the distance bolt and the cat claw;

[0012] The disc spring has a large diameter end and a small diameter end. The two disc springs are stacked in a manner that the small diameter ends are opposite to each other, so that the large diameter ends of the two disc springs are respectively in contact with the nut and the cat's claw, or the two disc springs can be stacked in sequence in a manner that the large diameter ends are oriented in the same direction, so that the two disc springs are detached from the nut.

[0013] In any of the above technical solutions, further, the cylinder cat claw support structure also includes a washer assembly, and the washer assembly includes a first washer, a second washer and a third washer which are sequentially sleeved on the distance bolt from the nut to the cat claw;

[0014] An installation gap is formed between the inner ring of the second washer and the distance bolt, and the two disc springs are arranged in the installation gap;

[0015] The height of a single disc spring is not greater than the height of the second washer, so that the first washer contacts the second washer and forms the predetermined interval with the nut when the two disc springs are stacked in sequence with their large diameter ends facing the same direction;

[0016] The sum of the heights of the two disc springs is greater than the height of the second washer, so that the first washer abuts against the nut and forms the predetermined interval with the second washer when the two disc springs are stacked with the small diameter ends facing each other.

[0017] In any of the above technical solutions, further, the height of the predetermined interval is 0.1-0.2 mm;

[0018] The maximum clamping force provided by the clamping assembly to the cat's claw is greater than the pipeline force.

[0019] The present application also provides a steam turbine, comprising a cylinder and a cylinder cat's claw support structure as described in any of the above technical solutions.

[0020] The present application also provides a method for checking the stability of a steam turbine, comprising the following steps:

[0021] Selecting an axis group including a first axis and a second axis that are not parallel to each other, wherein the plane where the first axis and the second axis lie is parallel to or coincides with the median plane;

[0022] Calculate the load moment of all the pipeline forces relative to the first axis as the first load moment, and calculate the load moment of all the pipeline forces relative to the second axis as the second load moment;

[0023] Calculating the resultant moment of the gravity of the steam turbine relative to the first axis as a first stability resultant moment, and calculating the resultant moment of the gravity of the steam turbine relative to the second axis as a second stability resultant moment;

[0024] comparing the first stability resultant moment with the first load resultant moment, and comparing the second stability resultant moment with the second load resultant moment;

[0025] If the first stability resultant moment is greater than the first load resultant moment, and the second stability resultant moment is greater than the second load resultant moment, it indicates that the steam turbine will not roll over.

[0026] In any of the above technical solutions, further, a plurality of axis groups are selected, and the first axis and the second axis in the plurality of axis groups do not overlap with each other;

[0027] Taking the first axis and the second axis of each axis group as rotation axes, the first stability resultant torque and the first load resultant torque are calculated and compared, and the second stability resultant torque and the second load resultant torque are calculated and compared.

[0028] In any of the above technical solutions, further, two groups of the axis groups are selected;

[0029] A first axis of one of the plurality of axis groups is selected to be parallel to the central axis of the steam turbine.

[0030] In any of the above technical solutions, further, the steam turbine stability verification method further includes the following steps:

[0031] comparing the resultant of all piping forces with the weight of the turbine;

[0032] If the resultant force of all pipeline forces is not greater than the gravity of the steam turbine, it means that the cylinder of the steam turbine will not be lifted up.

[0033] Compared with the prior art, the beneficial effects of this application are:

[0034] The cylinder cat's claw support structure provided by the present application includes a cat's claw, a distance connection piece and a clamping assembly. The cat's claw is arranged at the center plane of the cylinder, and the cat's claw is connected to the cylinder through the distance connection piece, so that the cylinder is stably seated on the frame through the cat's claw. The clamping assembly is detachably arranged on the side of the cat's claw that is away from the center plane. In the case that the cat's claw is separated from the center plane due to the installation site or transportation, the cat's claw is pressed toward the center plane by the clamping assembly with the distance connection piece as a fulcrum, so that the cat's claw is restored to a state of being in contact with the center plane. The cylinder cat's claw support structure can correct the cat's claw that deviates from the center plane during the installation stage of the cylinder, thereby avoiding the situation that the cylinder is scrapped or returned to the factory due to the cat's claw deviating from the center plane, which is conducive to reducing the scrap rate and return rate of the cylinder and improving the installation efficiency of the cylinder.

[0035] The steam turbine provided in the present application includes the above-mentioned cylinder cat's claw support structure, so that it can be stably seated on the seat frame through the cylinder cat's claw support structure and can achieve all the beneficial effects of the cylinder cat's claw support structure.

[0036] The steam turbine stability verification method provided in the present application verifies the stability of the cylinder by comparing the stability resultant torque and the load resultant torque. This verification method analyzes the stability of the cylinder as a whole, rather than verifying from a single pipe mouth. Compared with the existing NEMASM23 verification method, it significantly reduces the limitations of the verification. The cylinder is located on the seat frame through the cat's claw, and the risk is mainly reflected in the way that the cylinder flips. Therefore, this verification method can effectively verify whether the cylinder will flip, which improves the practicality of the verification results. Especially for smaller units, due to their small dead weight, it is not reliable to verify from a single pipe mouth, and this verification method can effectively ensure that the unit will not roll over after installation.

[0037] After the steam turbine stability check method is used for checking, it can avoid the need to rearrange and adjust external equipment such as pipelines due to poor unit stability during unit operation in the future, saving a lot of manpower and material resources caused by rework and maintenance. In addition, the steam turbine stability check method has been verified on hundreds of steam turbines, and has been proven to be reasonable and reliable through years of operation feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1A schematic diagram of the structure of the cylinder cat's claw support structure provided in Example 1 of the present application;

[0040] Figure 2 A partial enlarged view of the clamping assembly of the cylinder cat claw support structure provided in Example 1 of the present application in the first state;

[0041] Figure 3 A partial enlarged view of the clamping assembly of the cylinder cat-claw support structure provided in Example 1 of the present application in the second state;

[0042] Figure 4 This is a force analysis diagram of the cylinder stability verification method according to the second embodiment of the present application.

[0043] Reference numerals:

[0044] 1-cylinder; 10-center dividing surface; 11-central axis; 2-cat's claw; 3-clamping assembly; 30-disc spring; 4-washer assembly; 40-first washer; 41-second washer; 42-third washer; 5-predetermined interval; 6-fixed distance connecting piece; 7-circumferential interval; 8-installation interval; 9-first axis group; 90-first axis of the first axis group; 91-second axis of the first axis group; 12-second axis group; 120-first axis of the second axis group; 121-second axis of the second axis group. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Embodiment 1

[0049] See also Figures 1 to 4 As shown, an embodiment of the present application provides a cylinder cat claw support structure including a cat claw 2, a distance connecting piece 6 and a clamping assembly 3.

[0050] The cylinder 1 includes a lower cylinder and an upper cylinder. The center dividing surface 10 of the cylinder 1 is the surface where the upper cylinder and the lower cylinder of the cylinder 1 are connected. The cat's claw 2 is arranged on the center dividing surface 10 of the cylinder 1 through a distance connecting piece, which can ensure that the cylinder 1 is stably seated on the seat frame. Among them, the cat's claw 2 is usually formed integrally with the upper cylinder of the cylinder 1, and the center dividing surface 10 is formed on the top of the lower cylinder of the cylinder 1. When the upper cylinder is lifted relative to the center dividing surface 10, commonly known as the cylinder lifting situation, the cat's claw 2 is lifted up at the same time as the upper cylinder, which will affect the stability of the cylinder 1 installed on the seat frame.

[0051] The clamping assembly 3 is detachably arranged on the side of the cat claw 2 away from the center dividing surface 10. The clamping assembly 3 can use the distance connecting piece 6 as a fulcrum to clamp the cat claw 2 toward the center dividing surface 10. In other words, the clamping assembly 3 has a first state and a second state. In the first state, the clamping assembly 3 uses the distance connecting piece 6 as a fulcrum to clamp the cat claw 2 toward the center dividing surface 10. In the second state, the clamping assembly 3 does not apply pressure to the cat claw 2, and the cat claw 2 can be fixed to the center dividing surface 10 by the fixing effect of the distance connecting piece 6. Therefore, after the cylinder 1 is seated on the seat frame through the cat claw 2, the positional relationship between the cat claw 2 and the center dividing surface 10 is checked. If the cat claw 2 is separated from the center dividing surface 10, the clamping assembly 3 is adjusted to the first state. If the cat claw 2 is still maintained on the center dividing surface 10, the clamping assembly 3 is maintained in the second state.

[0052] In this embodiment, since the assembly position between the cat claw 2 and the center dividing surface of the cylinder 1 is adjusted by the clamping assembly 3, once adjusted, the clamping assembly 3 cannot be removed to ensure that the cat claw 2 is maintained in a state of being in contact with the center dividing surface 10. Therefore, it is necessary to ensure that the maximum clamping force provided by the clamping assembly 3 to the cat claw 2 is greater than the pipe force, so as to ensure that the clamping assembly 3 will not fail under the action of the pipe force during the use of the cylinder 1, thereby effectively preventing the cat claw 2 from being separated from the center dividing surface 10 and causing irreversible effects on the stability of the cylinder 1.

[0053] In the optional scheme of this embodiment, the distance connection member 6 is a distance bolt, the cat claw 2 is provided with a connecting through hole, the distance bolt passes through the connecting through hole and is screwed to the center plane of the cylinder, a circumferential gap 7 is formed between the distance bolt and the connecting through hole, and a predetermined gap 5 is formed between the nut of the distance bolt and the surface of the cat claw 2 away from the center plane 10 through the clamping assembly 3. Specifically, a predetermined gap is formed between the distance bolt and the clamping assembly 3, or a predetermined gap is formed inside the clamping assembly 3, as long as the nut of the distance bolt and the clamping assembly 3 can be prevented from being in close contact with the cat claw 2 together.

[0054] Therefore, during the use of the cylinder 1, if the cylinder 1 expands due to heat, due to the provision of a predetermined gap, the distance bolt and the clamping assembly 3 do not completely clamp the cat claw 2 and the cylinder 1, and a circumferential gap 7 is formed between the distance bolt and the inner wall of the connecting through hole. Therefore, the distance bolt can move horizontally in the connecting through hole driven by the cylinder 1 to meet the movement requirements of the cylinder 1 under the action of expansion, and by preventing the cat claw 2 from forming a rigid connection with the cylinder 1, serious deformation of the cylinder 1 due to its inability to expand freely can be avoided.

[0055] In an optional solution of this embodiment, the clamping assembly 3 includes two disc springs 30 detachably mounted on the distance bolt, and the two disc springs 30 are located between the nut of the distance bolt and the cat claw 2.

[0056] The disc spring 30 has a large diameter end and a small diameter end. In the first state of the clamping assembly 3, the two disc springs 30 are stacked with the small diameter ends facing each other, so that the large diameter ends of the two disc springs 30 are respectively in contact with the nut and the cat's claw 2. In this state, the supporting force provided by the two disc springs 30 is still the supporting force provided by the single disc spring 30, but the height is sufficient to make the large diameter ends of the two disc springs 30 abut against the nut and the cat's claw 2 respectively.

[0057] Thus, the two disc springs 30 apply a supporting force toward the center plane 10 to the cat claw 2 with the nut as a fulcrum. When the pipeline force is not greater than the supporting force provided by a single disc spring 30, the cat claw 2 can be kept on the center plane 10, thereby ensuring the stability of the cylinder 1.

[0058] Alternatively, in the second state, the two disc springs 30 can be stacked sequentially with their large diameter ends facing in the same direction, so that the two disc springs 30 are detached from the nut without generating any additional spring force. Thus, before the cylinder 1 leaves the factory, the two disc springs 30 are stacked in this state, which not only enables the two disc springs 30 to leave the factory synchronously with the cylinder 1 for subsequent use in adjusting the position of the cat's claw 2, but also does not affect the normal connection between the cat's claw 2 and the cylinder 1 if the cat's claw 2 does not need to be adjusted subsequently.

[0059] In this embodiment, the cylinder cat's claw support structure further includes a washer assembly 4 , which includes a first washer 40 , a second washer 41 and a third washer 42 which are sequentially sleeved on the distance bolt from the nut to the cat's claw 2 .

[0060] An installation gap 8 is formed between the inner ring of the second washer 41 and the distance bolt, and two disc springs 30 are arranged in the installation gap 8. The installation gap 8 provides an installation space for the disc springs 30 so that the two disc springs 30 are located between the first washer 40 and the second washer 41 along the axial direction of the distance bolt, so that the bottom end of the disc spring 30 is always located on the third washer 42, and the top end of the disc spring 30 faces the first washer 40.

[0061] The height of a single disc spring 30 is not greater than the height of the second washer 41, so that when the two disc springs 30 are stacked in sequence with their large diameter ends facing the same direction, that is, in the second state, the tops of the two disc springs 30 do not contact the first washer 40, that is, they do not lift up the first washer 40, and the first washer 40 forms a predetermined interval 5 with the nut to avoid a rigid connection between the cat's claw 2 and the upper cylinder of the cylinder 1, thereby ensuring that the cylinder 1 has sufficient expansion margin.

[0062] The sum of the heights of the two disc springs 30 is greater than the height of the second washer 41. When the two disc springs 30 are stacked with their small diameter ends facing each other, that is, in the first state, the tops of the two disc springs 30 contact the first washer 40 and lift the first washer 40 to a position abutting against the nut. At the same time, a predetermined interval 5 is formed between the first washer 40 and the second washer 41 to avoid a rigid connection between the cat's claw 2 and the lower cylinder of the cylinder 1, thereby ensuring that the lower cylinder or upper cylinder of the cylinder 1 has sufficient expansion margin.

[0063] In this embodiment, generally speaking, the height direction movement distance of the cat claw 2 caused by the heat expansion of the cylinder 1 is 0.1-0.2 mm, and the thermal expansion requirements of the cat claw 2 can be met by setting the height of the predetermined interval 5 and the maximum deformation of the single disc spring 30 to 0.1-0.2 mm. For example, the height of the predetermined interval 5 and the maximum deformation of the single disc spring 30 are both 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm or 0.2 mm.

[0064] Embodiment 2

[0065] Embodiment 2 provides a steam turbine, which is used to calibrate the steam turbine having the cylinder cat's claw support structure in Embodiment 1. The technical features of the cylinder cat's claw support structure disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the cylinder cat's claw support structure disclosed in Embodiment 1 will not be described repeatedly.

[0066] The steam turbine provided in this embodiment includes a cylinder 1 and a cylinder cat's claw support structure provided in Embodiment 1. Specifically, the number of cat's claws 2 may be four, and the four cat's claws 2 are symmetrically arranged in pairs about the central axis 11 of the cylinder 1, wherein the central axis 11 of the cylinder 1 is the center line of the cylinder 1 in the left-right direction and extends along the front-back direction of the cylinder 1.

[0067] The steam turbine stability verification method in this embodiment has the advantages of the cylinder 1 cat's claw 2 support structure in the first embodiment. The advantages of the cylinder cat's claw support structure disclosed in the first embodiment will not be repeatedly described here.

[0068] Embodiment 3

[0069] Embodiment 3 provides a method for checking the stability of a steam turbine, which is used to check the steam turbine in Embodiment 2. The technical features of the steam turbine disclosed in Embodiment 2 are also applicable to this embodiment, and the technical features of the steam turbine disclosed in Embodiment 2 will not be described repeatedly.

[0070] Combination Figures 1 to 3 See also Figure 4 As shown, the steam turbine stability verification method provided in this embodiment includes the following steps:

[0071] Step S100, selecting an axis group including a first axis and a second axis that are not parallel to each other, wherein the plane where the first axis and the second axis lie is parallel to or coincides with the median plane 10;

[0072] Step S200, calculating the load resultant moment of all pipeline forces relative to the first axis as the first load resultant moment, and calculating the load resultant moment of all pipeline forces relative to the second axis as the second load resultant moment;

[0073] Step S300, calculating the resultant moment of the gravity of the steam turbine relative to the first axis as the first stability resultant moment, and calculating the resultant moment of the gravity of the steam turbine relative to the second axis as the second stability resultant moment;

[0074] Step S400, comparing the first stability resultant moment and the first load resultant moment, and comparing the second stability resultant moment and the second load resultant moment;

[0075] Step S500: If the first stability resultant torque is greater than the first load resultant torque, and the second stability resultant torque is greater than the second load resultant torque, it means that cylinder 1 meets the stability verification requirement.

[0076] In this embodiment, in step S100, the first axis and the second axis can be both located in the median plane 10, or both parallel to the median plane 10, and the first axis and the second axis are not parallel to each other, thereby determining a two-dimensional coordinate system parallel to or overlapping with the median plane 10. Optionally, the first axis and the second axis are perpendicular to each other.

[0077] In step S200, by calculating the first load resultant moment and the second load resultant moment, the negative effects of all pipeline forces on the stability of the cylinder 1 are quantified holistically. Each pipeline force is provided by the design institute and can be used without collection, which is convenient for calculation.

[0078] In step S300, by calculating the first stability resultant moment and the second stability resultant moment, the positive effect of the gravity of the steam turbine on the stability of the cylinder 1 is quantified in an overall manner. The gravity of the steam turbine is provided by the design institute and can be used without collection, which is convenient for calculation.

[0079] In step S400, by comparing the negative effect with the positive effect along the first axis, it is determined whether the cylinder will roll over around the first axis. By comparing the negative effect with the positive effect along the second axis, it is determined whether the cylinder will roll over around the second axis. If the cylinder will neither roll over around the first axis nor around the second axis, this largely indicates that the cylinder will not roll over relative to the center plane 10.

[0080] It is worth emphasizing that, in the comparison process, if the first load resultant moment is in the same direction as the first stability resultant moment, or the first load resultant moment is in a different direction from the first stability resultant moment, but the first load resultant moment is smaller than the first stability resultant moment, then it means that the rollover effect of all pipeline forces on the first axis is within the allowable range. Similarly, if the second load resultant moment is in the same direction as the second stability resultant moment, or the second load resultant moment is in a different direction from the second stability resultant moment, but the second load resultant moment is smaller than the second stability resultant moment, then it means that the rollover effect of all pipeline forces on the second axis is within the allowable range.

[0081] Furthermore, the verification method of the steam turbine stability is not only simple and easy but also very reliable and comprehensive because it considers the directionality of forces and moments as a whole, while examining a single pipe opening cannot reflect the overall impact of directionality.

[0082] In the optional scheme of this embodiment, multiple groups of axis groups are selected, and the first axes and the second axes in the multiple axis groups do not overlap with each other, that is, the first axes in all axis groups do not overlap, and the second axes in all axis groups do not overlap. It can be understood that the first axes in any two axis groups can be parallel or intersecting, and similarly, the second axes in any two axis groups can be parallel or intersecting.

[0083] The first axis and the second axis of each axis group are used as the rotation axis to calculate and compare the first stability resultant moment with the first load resultant moment, and to calculate and compare the second stability resultant moment with the second load resultant moment. This makes it possible to check whether the steam turbine will roll over around multiple first axes, and also to check whether the steam turbine will roll over around multiple second axes, thereby eliminating the possibility of the steam turbine rolling over more comprehensively in terms of space.

[0084] In this embodiment, in order to strike a balance between the need for computational simplification and the diversity of computational dimensions, two axis groups are selected. One of the two axis groups is the first axis group 9, and the other is the second axis group 12. Figure 4 As shown, an arrangement of the first axis 90 of the first axis group and the second axis 91 of the first axis group is shown, and an arrangement of the first axis 120 of the second axis group and the second axis 121 of the second axis group is shown.

[0085] In this embodiment, the first axis of one of the multiple axis groups is selected to be parallel to the center axis 11 of the cylinder 1, so as to simplify the calculation. In addition, the reliability of the verification can be improved by increasing the area of ​​the steam turbine covered by the multiple axis groups and the discreteness of the positions of different axis groups.

[0086] In an optional solution of this embodiment, the steam turbine stability verification method further includes the following steps:

[0087] Step S500, comparing the resultant force of all pipeline forces with the gravity of the steam turbine;

[0088] Step S600: If the resultant force of all pipeline forces is not greater than the gravity of the steam turbine, it means that the steam turbine will not be lifted.

[0089] When the gravity of the steam turbine is large enough and the pressure of the steam turbine on the frame is large enough, there will be no problems such as lifting and translation. Therefore, after checking the steam turbine through steps S500 and S600, it can prevent the steam turbine from lifting and translation after leaving the factory. Especially for small-sized steam turbines, it is very easy to have the problem of lifting and translation, so it is necessary to check steps S500 and S600.

[0090] It is worth emphasizing that in the comparison process of step S600, if the direction of the resultant force of the pipeline forces is the same as the direction of the gravity of the steam turbine, or the direction of the resultant force of the pipeline forces is opposite to the direction of the gravity of the steam turbine, but the magnitude of the pipeline forces is smaller than the magnitude of the gravity of the steam turbine, then the resultant force of the pipeline forces is within the allowable range.

[0091] The steam turbine stability verification method in this embodiment has the advantages of the steam turbine in the second embodiment, and the advantages of the steam turbine disclosed in the second embodiment will not be described repeatedly here.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means being within the scope of the present invention and forming different embodiments. For example, any one of the claimed embodiments can be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A cylinder cat claw support structure, characterized in that: It includes cat claws, distance connectors and clamping components; The cat's claw is used to be arranged at the center dividing surface of the cylinder, and the cat's claw is connected to the cylinder through the distance connecting piece; The pressing assembly is used to be detachably arranged on a side of the cat's claw away from the middle dividing surface, and the pressing assembly can press the cat's claw toward the middle dividing surface with the distance connecting piece as a fulcrum; The clamping assembly has a first state and a second state; In the first state, the pressing assembly uses the distance connecting member as a fulcrum to press the cat's claw toward the middle dividing surface; In the second state, the pressing assembly does not apply pressure to the cat's claw, and the cat's claw is fixed on the middle dividing surface by the fixing action of the distance connecting member; The distance connecting piece is a distance bolt, and the cat's claw is provided with a connecting through hole. The distance bolt passes through the connecting through hole and is screwed to the cylinder. A circumferential interval is formed between the distance bolt and the connecting through hole. The nut of the distance bolt and the surface of the cat's claw facing away from the center dividing surface form a predetermined interval through a clamping assembly.

2. The cylinder cat claw support structure according to claim 1, characterized in that: The clamping assembly includes two disc springs detachably sleeved on the distance bolt, and the two disc springs are located between the nut of the distance bolt and the cat claw; The disc spring has a large diameter end and a small diameter end. The two disc springs are stacked in a manner that the small diameter ends are opposite to each other, so that the large diameter ends of the two disc springs are respectively in contact with the nut and the cat's claw, or the two disc springs can be stacked in sequence in a manner that the large diameter ends are oriented in the same direction, so that the two disc springs are detached from the nut.

3. The cylinder cat claw support structure according to claim 2, characterized in that: It also includes a washer assembly, which includes a first washer, a second washer and a third washer which are sequentially sleeved on the distance bolt from the nut to the cat's claw; An installation gap is formed between the inner ring of the second washer and the distance bolt, and the two disc springs are arranged in the installation gap; The height of a single disc spring is not greater than the height of the second washer, so that the first washer contacts the second washer and forms the predetermined interval with the nut when two disc springs are stacked in sequence with their large diameter ends facing the same direction; The sum of the heights of the two disc springs is greater than the height of the second washer, so that the first washer abuts against the nut and forms the predetermined interval with the second washer when the two disc springs are stacked with the small diameter ends facing each other.

4. The cylinder cat claw support structure according to claim 2, characterized in that: The height of the predetermined interval and the maximum deformation of a single disc spring are both 0.1-0.2 mm; The maximum clamping force provided by the clamping assembly to the cat's claw is greater than the pipeline force.

5. A steam turbine, characterized in that: The invention comprises a cylinder and the cylinder cat claw supporting structure according to any one of claims 1 to 4.

6. A method for checking the stability of a steam turbine, characterized in that: For verifying the steam turbine according to claim 5, comprising the following steps: Selecting an axis group including a first axis and a second axis that are not parallel to each other, wherein the plane where the first axis and the second axis lie is parallel to or coincides with the median plane; Calculate the load moment of all pipeline forces relative to the first axis as the first load moment, and calculate the load moment of all pipeline forces relative to the second axis as the second load moment; Calculating the resultant moment of the gravity of the steam turbine relative to the first axis as a first stability resultant moment, and calculating the resultant moment of the gravity of the steam turbine relative to the second axis as a second stability resultant moment; comparing the first stability resultant moment with the first load resultant moment, and comparing the second stability resultant moment with the second load resultant moment; If the first stability resultant moment is greater than the first load resultant moment, and the second stability resultant moment is greater than the second load resultant moment, it indicates that the steam turbine will not roll over.

7. The method for checking the stability of a steam turbine according to claim 6, characterized in that: Selecting a plurality of axis groups, wherein the first axis and the second axis in the plurality of axis groups do not overlap with each other; Taking the first axis and the second axis of each axis group as rotation axes, the first stability resultant torque and the first load resultant torque are calculated and compared, and the second stability resultant torque and the second load resultant torque are calculated and compared.

8. The method for checking the stability of a steam turbine according to claim 7, characterized in that: selecting two groups of the axis groups; A first axis of one of the plurality of axis groups is selected to be parallel to the central axis of the steam turbine.

9. The method for checking the stability of a steam turbine according to claim 6, characterized in that: The following steps are also included: comparing the resultant of all piping forces with the weight of the turbine; If the resultant force of all pipeline forces is smaller than the weight of the steam turbine, it means that the cylinder of the steam turbine will not be lifted up.

Images