Industrial steam turbine rotor and steam turbine

Abstract

The utility model discloses an industrial steam turbine rotor and a steam turbine, the industrial steam turbine rotor comprises a first arc-shaped section and a second arc-shaped section, and the first arc-shaped section and the second arc-shaped section are closed to form a main shaft body with a circular cross section; a plurality of thinned moving blades are arranged on the outer arc surface of the first arc section at equal intervals, and a plurality of standard moving blades are arranged on the outer arc surface of the second arc section at equal intervals; the thinning moving blades arranged at the two ends of the first arc-shaped section are positioned through thinning blade separation blocks; the last thinning moving blade mounted on the first arc-shaped section is positioned through a locking blade separation block; the other thinning moving blades are positioned through blade separation blocks; and the standard moving blade is positioned through the blade separation block. The thickness of the thinned leaf separation block is 2 mm, the thickness of the leaf separation block is 4 mm, and the thickness of the fore shaft leaf separation block is 4 mm. The utility model can meet the mounting requirements of the moving blade and the main shaft, reduce the assembly difficulty of the moving blade, shorten the assembly time and facilitate the safe and stable operation of a unit.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, and in particular relates to an industrial steam turbine rotor and a steam turbine. Background Art

[0002] The moving blades are the key parts of the steam turbine. They work under extremely harsh conditions, are subject to the effects of high-temperature and high-pressure steam, and are subject to large bending moments during operation. The moving blades in high-speed operation are also subject to high centrifugal forces. The moving blades working in the wet steam area are also subject to erosion by water droplets. The structural design, vibration intensity and operating mode of the moving blades have a decisive influence on the safety and reliability of the unit. The structural design, vibration intensity and operating mode of the moving blades have a decisive influence on the safety and reliability of the unit. The moving blades generally have T-type, outwrapped T-type and double inverted T-type structures. The last blade is the last blade, which needs to be firmly fixed to the main shaft or impeller through pins or saddle screws to prevent the blades from flying out when the turbine is running. The locking structure of the moving blades is crucial and is related to the safe and reliable operation of the unit.

[0003] In the prior art, when installing the moving blades, the standard moving blades are screwed into the root grooves one by one through the lock mouth, and the last blade is installed and then equipped with a taper pin hole or a saddle screw hole, and fixed with a taper pin. When assembling, the last blade taper pin needs to be installed and pushed first, then driven in 3 to 5 mm, the taper pin head surplus is removed, and three points are punched and tightened. When fixed with a saddle screw, the screw needs to be screwed into the screw hole, and then the excess screw head is removed. Its defects are: the rotor and the blades need to be placed on the processing equipment together with the pin holes or screw holes, which is time-consuming and labor-intensive, and is not conducive to the rapid assembly work; the last blade pin or saddle screw hole with smaller specifications is difficult to process, and the screw is easy to break when the screw is screwed in; for relatively small blades, a slightly larger taper pin or saddle screw is required to lock the last blade when the speed is high; the thickness of the last blade needs to be thickened to have enough space to drive the pin or saddle screw, which increases the difficulty of blade design, uneven blade flow path, and affects the unit operation efficiency. If the pin or the saddle screw is hit off-center, the last blade may be pierced, weakening the strength of the last blade. There is a risk of the blade flying out, affecting the safe and stable operation of the unit. Summary of the invention

[0004] The utility model aims to provide an industrial steam turbine rotor and a steam turbine, so as to solve the problems in the prior art that the moving blade installation mechanism is difficult to assemble, takes a long time to assemble and has a high assembly cost.

[0005] In order to solve the above problems, the technical solution provided by the utility model is:

[0006] An industrial steam turbine rotor comprises a first arc segment and a second arc segment, wherein the first arc segment and the second arc segment are closed to form a main shaft body with a circular cross section; a plurality of thinned moving blades are arranged at equal intervals on the outer arc surface of the first arc segment, and a plurality of standard moving blades are arranged at equal intervals on the outer arc surface of the second arc segment;

[0007] Among them, the thinned moving blades arranged at both ends of the first arc segment are positioned by thinned spacer blocks; the last thinned moving blade installed on the first arc segment is positioned by a locking spacer block; the remaining thinned moving blades are positioned by spacer blocks; the standard moving blades are positioned by spacer blocks.

[0008] The utility model also has the following technical features:

[0009] Specifically, a blade root groove is provided on the outer wall of the main shaft body along the circumferential direction.

[0010] Furthermore, the thickness of the thinned partition leaf block is 2 mm, the thickness of the partition leaf block is 4 mm, and the thickness of the locked partition leaf block is 4 mm.

[0011] Furthermore, the partition block includes a first connection part and a second connection part which are detachably connected, and a plurality of first locking steps are arranged on the outer wall of the first connection part away from the second connection part; and a plurality of second locking steps are arranged on the outer wall of the second connection part away from the first connection part.

[0012] Furthermore, the locking diaphragm block includes a third connection part, a wedge-shaped part and a fourth connection part which are sequentially connected from left to right, and a plurality of first limiting steps are arranged on the outer wall of the third connection part away from the fourth connection part; a plurality of second limiting steps are arranged on the outer wall of the fourth connection part away from the third connection part

[0013] Furthermore, the lower ends of the thinned moving blades and the standard moving blades are both provided with blade roots, and the outer wall of the main shaft body is provided with blade root grooves, and the blade roots and the blade root grooves can be matched and connected.

[0014] Furthermore, the top of the third connecting part and the top of the fourth connecting part are both provided with a protrusion.

[0015] Furthermore, a plurality of weight-reducing holes are provided on the wedge-shaped portion.

[0016] The present invention also protects a steam turbine, which adopts the above-mentioned industrial steam turbine rotor.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model can meet the installation requirements and multiple disassembly requirements of the moving blades and the main shaft, effectively reduce the assembly difficulty of the moving blades, shorten the assembly time, reduce the assembly cost, and small blades do not need to be thickened, thereby ensuring the uniformity of the flow channel and improving the operating efficiency of the unit; the strength of the blades will not be weakened, which is conducive to the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a partial structural schematic diagram of the utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the septum block;

[0023] Figure 4 It is a schematic diagram of the locking partition block structure.

[0024] The symbols in the figure represent:

[0025] 1-main shaft body, 2-thinned moving blades, 3-standard moving blades, 4-thinned spacer blocks, 5-locking spacer blocks, 6-spacer blocks, 7-blade root mounting grooves;

[0026] 51-third connecting portion, 52-wedge-shaped portion, 53-fourth connecting portion, 54-first limiting step, 55-second limiting step, 56-protruding portion;

[0027] 61-first connecting part, 62-second connecting part, 63-first locking step, 64-second locking step;

[0028] 521-Weight reduction hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the present disclosure to clearly and completely describe the technical solutions in the present disclosure. Obviously, the embodiments described below are only part of the embodiments of the present utility model, not all of the embodiments, and do not limit the present disclosure in any form. All technical solutions using the embodiments, including simple changes to the embodiments, are within the scope of protection of the present disclosure.

[0030] It should be noted that when describing the position of the present invention, Figure 4The orientation. The orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "side", etc. is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. If the specific posture changes, the directional indication will also change accordingly. In the utility model, unless otherwise clearly stipulated and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0031] The directional words mentioned in the present disclosure, such as "axial" refers to the axial direction where the main axis in the figure is located, and radial refers to the direction perpendicular to the axial direction; the structures of the main components in the present invention are all block structures. Therefore, the block generally has six faces. Looking from the direction facing the figure, the top and bottom faces of the block, the top end and the bottom end, and the faces surrounding the main structure of the block are side faces, which generally have four faces, and form a block structure with the top and bottom faces.

[0032] The radial direction mentioned in the present disclosure refers to the direction relative to the axial direction, that is, the direction perpendicular to the axial direction is the radial direction. Positioning in the present disclosure refers to limiting displacement movement.

[0033] Example 1

[0034] Following the above technical solution, Figures 1 to 4 As shown, in this embodiment, multiple stages of moving blades are installed on the main shaft body 1, adjacent standard moving blades 3 are in close contact, and there are no other parts between adjacent moving blades 3. Thinned moving blades 2 are also arranged on some arc sections of the main shaft body 1.

[0035] Specifically, the present embodiment provides an industrial steam turbine rotor, comprising a first arc segment and a second arc segment, wherein the first arc segment and the second arc segment are closed to form a main shaft body 1 with a circular cross-section, 18 thinned moving blades 2 are evenly spaced on the outer arc surface of the first arc segment, and 43 standard moving blades 3 are evenly spaced on the outer arc surface of the second arc segment, that is, a total of 61 moving blades are arranged on the main shaft body 1 along the circumferential direction; in the present embodiment, the central angle corresponding to the first arc segment 1 is approximately 90°, and the central angle corresponding to the second arc segment is approximately 270°, and the thinned moving blades 2 that are thinner than the standard moving blades 3 can leave space for the rotation of the standard moving blades 3.

[0036] Among them, the thinned moving blades 2 arranged at both ends of the first arc segment are positioned by thinned spacer blocks 4; the last thinned moving blade 2 installed on the first arc segment is positioned by a locking spacer block 5; and the remaining thinned moving blades 2 are positioned by spacer blocks 6.

[0037] In this embodiment, the thinned moving blade 2 and the standard moving blade 3 have the same size and shape, and the blade root thickness of the thinned moving blade 2 is smaller than the blade root thickness of the standard moving blade 3 .

[0038] As a preferred solution of this embodiment, a blade root groove is opened on the outer wall of the main shaft body 1 along the circumferential direction, and the blade root groove 7 is used to install and fix the standard moving blade 3 or the thinned moving blade.

[0039] As a preferred solution of this embodiment, the thickness of the thinned partition leaf block 4 is 2 mm, the thickness of the partition leaf block 6 is 4 mm, and the thickness of the locking partition leaf block 5 is 4 mm.

[0040] As a preferred solution of the present embodiment, the partition block 6 includes a first connection part 61 and a second connection part 62 which are detachably connected, and a plurality of first locking steps 63 for radial limiting are arranged on the outer wall of the first connection part 61 away from the second connection part 62; a plurality of second locking steps 64 for radial limiting are arranged on the outer wall of the second connection part 62 away from the first connection part 61. The number and shape of the first locking steps 63 and the second locking steps 64 can be adjusted as needed, and the shapes in the figure are only examples. During the operation of the steam turbine, the position of the partition block 6 does not change, and the shapes in the figure are only examples. The advantage of dividing the partition block 6 into two parts is that it is easy to insert between adjacent moving blades. The partition block has a margin for easy adjustment during assembly.

[0041] As a preferred solution of this embodiment, the locking blade block 5 includes a third connecting portion 51, a wedge-shaped portion 52 and a fourth connecting portion 53 which are sequentially connected from left to right. A plurality of first limiting steps 54 for radial limiting are arranged on the outer wall of the third connecting portion 51 away from the fourth connecting portion 53; a plurality of second limiting steps 55 for radial limiting are arranged on the outer wall of the fourth connecting portion 53 away from the third connecting portion 51. The number and shape of the first limiting steps 54 and the second limiting steps 55 can be adjusted as needed, and the shape in the figure is only an example. During the operation of the steam turbine, the position of the locking blade block 5 does not change, and the shape in the figure is only an example. During the assembly process, when installing the locking blade block 5, only 4 mm of operable space is left in the circumferential direction of the main shaft body 1. In order to smoothly install the locking blade block 5, the locking blade block 5 is set to several parts. When assembling, 51 and 53 are inserted first; 51 and 53 are pushed into both sides of the blade root groove, and then 52 is inserted.

[0042] The wedge-shaped portion 52 is a wedge-shaped block, which is mainly tightened and limited by a conical locking structure. The wedge-shaped portion 52 cooperates with the third connecting portion 51 and the fourth connecting portion 53 to ensure that the position of the locking blade partition block 5 does not change during the operation of the moving blade. The shape in the figure is only an example.

[0043] As a preferred solution of this embodiment, the lower ends of the thinned moving blades 2 and the standard moving blades 3 are both provided with blade roots, and the outer wall of the main shaft body 1 is provided with blade root grooves, and the blade roots and the blade root grooves can be matched and connected.

[0044] As a preferred solution of this embodiment, the top of the third connecting portion 51 and the top of the fourth connecting portion 53 are both provided with a protrusion 56. After the locking partition leaf block 5 is installed, the protrusion 56 can be bent with a tool to press the wedge-shaped portion 53, so that the surface of the installed locking partition leaf block 5 is flush and then polished smooth.

[0045] As a preferred solution of this embodiment, a plurality of weight-reducing holes 521 are provided on the wedge-shaped portion 52 , and the plurality of weight-reducing holes 521 are arranged in an array.

[0046] The use process of the utility model is as follows:

[0047] Step 1: Dig a blade root groove on the outer wall of the main shaft body 1, and install the standard moving blade 3 and the thinned moving blade 2 in the blade root groove; Figure 4 As shown, the standard moving blade 3 and the thinned moving blade 2 are first inserted into the blade root groove, and then rotated 90 degrees and locked;

[0048] Step 2, installing the spacer blocks for limiting, wherein the thinned moving blades 2 arranged at the left and right ends of the first arc segment are positioned by the thinned spacer blocks 4; the remaining thinned moving blades 2 are positioned by the spacer blocks 6;

[0049] Step 3: Install the locking blade spacer block. The last thinned moving blade 2 installed on the first arc segment is positioned by the locking blade spacer block 5.

[0050] The utility model is verified through finite element analysis calculation, test piece overspeed test, overspeed test after the moving blade and the main shaft are assembled, on-site operation and other verification processes, and the utility model meets the operation requirements.

[0051] Example 2

[0052] This embodiment discloses a steam turbine, which uses the industrial steam turbine rotor disclosed in Embodiment 1.

[0053] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0055] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An industrial steam turbine rotor, comprising a first arc segment and a second arc segment, wherein the first arc segment and the second arc segment are closed to form a main shaft body (1) with a circular cross section, characterized in that: A plurality of thinned moving blades (2) are arranged at equal intervals on the outer arc surface of the first arc segment, and a plurality of standard moving blades (3) are arranged at equal intervals on the outer arc surface of the second arc segment; The thinned moving blades (2) arranged at both ends of the first arc segment are positioned by thinned spacer blocks (4); the last thinned moving blade (2) installed on the first arc segment is positioned by a locking spacer block (5); and the remaining thinned moving blades (2) are positioned by spacer blocks (6).

2. The industrial steam turbine rotor according to claim 1, characterized in that: A blade root groove (7) is provided on the outer wall of the main shaft body (1) along the circumferential direction.

3. The industrial steam turbine rotor according to claim 1, characterized in that: The thickness of the thinned barrier leaf block (4) is 2 mm, the thickness of the barrier leaf block (6) is 4 mm, and the thickness of the locking barrier leaf block (5) is 4 mm.

4. The industrial steam turbine rotor according to claim 1, characterized in that: The partition block (6) comprises a first connection part (61) and a second connection part (62) which are detachably connected, and a plurality of first locking steps (63) for radial limiting are arranged on the outer wall of the first connection part (61) away from the second connection part (62); and a plurality of second locking steps (64) for radial limiting are arranged on the outer wall of the second connection part (62) away from the first connection part (61).

5. The industrial steam turbine rotor according to claim 1, characterized in that: The locking partition leaf block (5) comprises a third connecting portion (51), a wedge-shaped portion (52) and a fourth connecting portion (53) which are sequentially connected from left to right, and a plurality of first limiting steps (54) for radial limiting are arranged on the outer wall of the third connecting portion (51) away from the fourth connecting portion (53); a plurality of second limiting steps (55) for radial limiting are arranged on the outer wall of the fourth connecting portion (53) away from the third connecting portion (51).

6. The industrial steam turbine rotor according to claim 1, characterized in that: The lower ends of the thinned moving blade (2) and the standard moving blade (3) are both provided with a blade root, and the blade root and the blade root groove (7) can be matched and connected.

7. The industrial steam turbine rotor according to claim 5, characterized in that: The top of the third connecting portion (51) and the top of the fourth connecting portion (53) are both provided with a protrusion (56).

8. The industrial steam turbine rotor according to claim 5, characterized in that: The wedge-shaped portion (52) is provided with a plurality of weight-reducing holes (521).

9. A steam turbine, characterized in that: The steam turbine adopts the industrial steam turbine rotor as described in any one of claims 1 to 7.

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