Blade for improving operation safety of low-pressure cylinder equipment of steam turbine

Abstract

The utility model provides a blade for improving operation safety of low-pressure cylinder equipment of a steam turbine. The blade comprises a body, a waterproof coating is arranged on the surface of the body, a blade root is fixedly connected to one end of the body, and fin-shaped tie bars are fixedly connected to the two sides of the surface of the body. According to the blade capable of improving the operation safety of the low-pressure cylinder equipment of the steam turbine, the length of the last-stage body in the abutting cylinder of the steam turbine is changed to be 880 mm, heat brought by blast friction is reduced, the surface of the body is provided with the waterproof coating, damage to a moving blade is reduced, the safety coefficient of the last-stage blade is improved, and the service life of the blade is prolonged. Meanwhile, the penultimate-stage body in the abutting cylinder of the steam turbine is transformed into a shroud ring from an original free blade to be matched with a positioning block and a positioning groove, so that the penultimate-stage body forms a whole-ring structure, the vibration resistance and strength of the body are improved, and the body is prevented from axially jumping out to generate dynamic and static collision abrasion; and the equipment defects such as low-pressure last-stage and second-last-stage cracks, water erosion and scouring can be thoroughly eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine field especially relates to a kind of vane that increases steam turbine low-pressure cylinder equipment operation safety. BACKGROUND

[0002] At present, most power plants ensure the economy of unit under large steam discharge volume flow, adopt whole-circle group vane with fin-type pull bar, vane length>1000mm, low-pressure cylinder secondary final stage vane adopts free vane, easy to disassemble and maintain.

[0003] Steam turbine implements unit large flow to external heat supply, and low-pressure cylinder admission flow is greatly reduced, although the minimum cooling flow requirement of design is strictly executed in the process of unit operation, but long-term operation in extremely low volume flow condition, it is easy to cause unit safety problem, such as low-pressure cylinder flow is too small, difficult to take away steam engine blast furnace heat, low-pressure cylinder is easy to overtemperature, deformation, and the top shape of thin flat plate of final stage vane top greatly reduces the vibration resistance of vane, under small volume flow, it is easy to occur vane water erosion, flutter, even fracture, threaten unit safety.

[0004] Therefore, it is necessary to provide a kind of vane that increases steam turbine low-pressure cylinder equipment operation safety to solve the above technical problems. SUMMARY

[0005] The utility model provides a kind of vane that increases steam turbine low-pressure cylinder equipment operation safety, solve the problem that present steam turbine vane is easy to occur vane deformation, water erosion, flutter, even fracture.

[0006] To solve the above technical problems, the utility model provides a kind of vane that increases steam turbine low-pressure cylinder equipment operation safety, including:

[0007] Body, the surface of the body is provided with waterproof coating, one end of the body is fixedly connected with blade root, the surface of the body is fixedly connected with fin-type pull bar on both sides, the length of the body is 880mm;

[0008] Surrounding band, the surrounding band is arranged in one end of the body, one end of the surrounding band is fixedly connected with positioning block, positioning groove is arranged in the inside of the surrounding band.

[0009] Preferably, the waterproof coating is made of NiCr metal ceramic material.

[0010] Preferably, the inside of one end of the surrounding band and the opposite end of the positioning block is provided with the positioning groove.

[0011] Preferably, rotating groove is arranged in the inside of the surrounding band, and rotating rod is rotatably connected to one end of the surrounding band.

[0012] Preferably, the inside of the surrounding band is provided with two limiting grooves, and the inside of the two limiting grooves is slidably connected with a limiting block.

[0013] Preferably, the inside of the surrounding band is provided with a plurality of fixing grooves, and the inside of the plurality of fixing grooves is slidably connected with a fixing strip.

[0014] Preferably, the plurality of fixing grooves are arranged on the two sides of the two limiting grooves, and one side of the plurality of fixing strips is fixedly connected to the two sides of the two limiting blocks.

[0015] Compared with the related art, the blade for increasing the operation safety of the low-pressure cylinder equipment of the steam turbine has the following beneficial effects:

[0016] The utility model provides a kind of blade for increasing the operation safety of the low-pressure cylinder equipment of the steam turbine, by the length of last stage body in steam turbine counter pressure cylinder is reformed as 880mm, reduce the heat caused by blast friction, and the surface of body is provided with waterproof coating, reduce the damage to moving blade, improve the safety factor of last stage blade, simultaneously by the design cooperation positioning block and positioning groove of last stage body in steam turbine counter pressure cylinder is reformed from original free blade to surrounding band, make last stage body form whole circle structure, improve the vibration resistance and strength of body, prevent the shafting of body from happening axial out, produce dynamic static rubbing, can completely eliminate low pressure last stage and secondary last stage crack, water erosion, scouring and other equipment defects, can practically improve the safety factor of body, prevent the occurrence of body fracture accident, can improve the adaptability of low-pressure cylinder large flow heating condition, reduce the adverse effects caused by low-pressure cylinder internal flow field instability and water erosion after low-pressure cylinder steam flow greatly drops, effectively improve equipment reliability. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic view of the first embodiment of the blade for increasing the operation safety of the low-pressure cylinder equipment of the steam turbine provided by the utility model;

[0018] Figure 2 It is the structure schematic view of the blade shown in the figure; Figure 1

[0019] Figure 3 It is the structure schematic view of the second embodiment of the blade for increasing the operation safety of the low-pressure cylinder equipment of the steam turbine provided by the utility model;

[0020] Figure 4 It is the structure schematic view of the surrounding band shown in the figure; Figure 3

[0021] Figure 5 It is the enlarged schematic view of A part shown in the figure. Figure 3

[0022] ​​​The figure mark: 1, the body, 2, the blade root, 3, the fin type reinforcing bar, 4, the surrounding band, 5, the positioning block, 6, the positioning groove, 7, the rotating groove, 8, the rotating rod, 9, the limiting groove, 10, the limiting block, 11, the fixed groove, 12, the fixed strip. DETAILED DESCRIPTION

[0023] The utility model will be further described below in connection with the drawings and embodiments.

[0024] First embodiment

[0025] Please combine with Figure 1 And Figure 2 Wherein, Figure 1 It is the structure schematic diagram of the first embodiment of the blade of the utility model for increasing the operation safety of the low-pressure cylinder equipment of steam turbine; Figure 2 It is Figure 1 The structure schematic diagram of the blade shown in the figure.A kind of blade for increasing the operation safety of the low-pressure cylinder equipment of steam turbine, comprising:

[0026] The body 1, the surface of the body 1 is provided with waterproof coating, one end of the body 1 is fixedly connected with blade root 2, both sides of the surface of the body 1 are fixedly connected with fin type reinforcing bar, the length of the body 1 is 880mm;

[0027] Surrounding band 4, the surrounding band 4 is arranged at one end of the body 1, one end of the surrounding band 4 is fixedly connected with positioning block 5, positioning groove 6 is arranged in the inside of the surrounding band 4.

[0028] The waterproof coating is made of NiCr cermet material.

[0029] The length of the last body 1 in the low-pressure cylinder of steam turbine is changed to 880mm, the heat caused by blast friction is reduced, and the surface of the body 1 is provided with waterproof coating, the damage to the moving body 1 is reduced, and the safety factor of the last blade is improved.

[0030] The waterproof coating can also be polytetrafluoroethylene, polyaspartic acid ester resin coating, carbon nitride titanium nitride composite coating, etc., for reducing the adverse effects of water erosion on the moving body 1 and improving the safety factor of the last blade.

[0031] One end of the surrounding band 4 and the inside of the opposite end of the positioning block 5 are provided with the positioning groove 6.

[0032] The positioning block 5 is a right-angled triangle, and the positioning groove 6 is a right-angled triangular groove matched with the positioning block 5.

[0033] The last stage body 1 in the pressure cylinder of the steam turbine is reformed from the original free blade to the design cooperation positioning block 5 and the positioning groove 6 of the surrounding band 4, so that the last stage body 1 forms a whole circle structure, the vibration resistance and the strength of the body 1 are improved, and the body 1 is prevented from axially out of place to cause dynamic and static rubbing.

[0034] Compared with the related art, the blade provided by the utility model has the following beneficial effects:

[0035] The utility model provides a kind of blade of increasing steam turbine low-pressure cylinder equipment operation safety, by the length of last stage body 1 in the pressure cylinder of steam turbine is reformed to 880mm, reduce the heat caused by blast friction, and the surface of body 1 is provided with waterproof coating, reduce the damage to moving blade, improve the safety factor of last stage blade, simultaneously by the last stage body 1 in the pressure cylinder of steam turbine is reformed from the original free blade to the design cooperation positioning block 5 and the positioning groove 6 of the surrounding band 4, so that the last stage body 1 forms a whole circle structure, the vibration resistance and the strength of the body 1 are improved, and the body 1 is prevented from axially out of place to cause dynamic and static rubbing, can completely eliminate low-pressure last stage and last stage crack, water erosion, scouring and other equipment defects, can practically improve the safety factor of body 1, prevent the occurrence of body 1 fracture accident, can improve the adaptability of low-pressure cylinder large flow heating condition, reduce the adverse effects caused by the unstable flow field in low-pressure cylinder and water erosion after the large flow of low-pressure cylinder steam inlet is greatly reduced, effectively improve equipment reliability.

[0036] Second embodiment

[0037] Please refer to Figure 3 And Figure 4 Based on the first embodiment of the application, another kind of blade for increasing the operation safety of steam turbine low-pressure cylinder equipment is provided. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment does not affect the separate implementation of the first embodiment.

[0038] Specifically, the difference between the blade for increasing the operation safety of steam turbine low-pressure cylinder equipment provided by the second embodiment of the application is that the blade for increasing the operation safety of steam turbine low-pressure cylinder equipment, the inside of the surrounding band 4 is provided with a rotating groove 7, and one end of the surrounding band 4 is rotatably connected with a rotating rod 8.

[0039] The inside of the surrounding band 4 is provided with two rotating grooves 7, and the bottom and top of each rotating groove 7 are open, and one end of each limiting block 10 is fixedly connected to one half of the top and one half of the bottom of the rotating rod 8, so that when the rotating rod 8 rotates to one side, the two limiting blocks 10 enter the inside of the two limiting grooves 9 respectively.

[0040] The inside of the surrounding band 4 is provided with two limiting grooves 9, and the inside of each of the two limiting grooves 9 is slidably connected with a limiting block 10.

[0041] The inside of the surrounding band 4 is provided with a plurality of fixing grooves 11, and the inside of each of the plurality of fixing grooves 11 is slidably connected with a fixing strip 12.

[0042] The plurality of fixing grooves 11 are respectively arranged on the two sides of the two limiting grooves 9, and one side of each of the plurality of fixing strips 12 is fixedly connected to the two sides of the two limiting blocks 10.

[0043] One side of each of the two fixing strips 12 is semicircular and is made of rubber material, and is used for limiting the limiting block 10 after the two limiting blocks 10 are moved into the inside of the limiting groove 9 and the plurality of fixing strips 12 are respectively moved into the inside of the plurality of fixing grooves 11.

[0044] The working principle of the blade for increasing the operation safety of a steam turbine low-pressure cylinder equipment is as follows:

[0045] In use, after the two surrounding bands 4 are combined, the rotating rod 8 at one end of one surrounding band 4 is moved into the inside of the rotating groove 7 in the other surrounding band 4, the rotating rod 8 is rotated to one side, the two limiting blocks 10 are moved to one side and respectively moved into the inside of the two limiting grooves 9, and the plurality of fixing strips 12 are respectively moved into the inside of the plurality of fixing grooves 11 after being moved to appropriate positions.

[0046] When the two surrounding bands 4 need to be separated, the limiting block 10 is moved to one side, the limiting block 10 is moved to one side in the limiting groove 9 and drives the rotating rod 8 to rotate to one side, the other limiting block 10 is moved to one side in the limiting groove 9 and is separated, and the plurality of fixing strips 12 are separated from the plurality of fixing grooves 11 when the two limiting blocks 10 are moved to one side, and the surrounding band 4 is moved upward when the limiting block 10 is parallel to the rotating groove 7, so that the rotating rod 8 is separated from the rotating groove 7 in the other surrounding band 4.

[0047] Compared with the related art, the blade for increasing the operation safety of a steam turbine low-pressure cylinder equipment has the following beneficial effects:

[0048] The blade for increasing the operation safety of a steam turbine low-pressure cylinder equipment is provided, the rotating groove 7 is matched with the rotating rod 8, the limiting groove 9, the limiting block 10, the fixing groove 11 and the fixing strip 12, the two surrounding bands 4 are combined and are limited therebetween, so that the two surrounding bands 4 become a whole, and the vibration resistance and the strength of the body 1 are improved.

[0049] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A blade for increasing the safety of operation of a low-pressure cylinder of a steam turbine, characterized in that, Include: The body, the surface of the body is provided with waterproof coating, one end of the body is fixedly connected with the blade root, both sides of the surface of the body are fixedly connected with the fin type reinforcing bar, the length of the body is 880mm; The surrounding band is provided on one end of the body, one end of the surrounding band is fixedly connected with the positioning block, the inside of the surrounding band is provided with the positioning groove.

2. The blade of claim 1, wherein, The waterproof coating is made of NiCr cermet material.

3. The blade of claim 1, wherein, The inside of one end of the surrounding band and the opposite end of the positioning block is provided with the positioning groove.

4. The blade of claim 3, wherein, The inside of the surrounding band is provided with the rotating groove, one end of the surrounding band is rotatably connected with the rotating rod.

5. The blade of claim 4, wherein, The inside of the surrounding band is provided with two limiting grooves, the inside of the two limiting grooves is slidably connected with the limiting block.

6. The blade of claim 5, wherein, The inside of the surrounding band is provided with a plurality of fixing grooves, the inside of the plurality of fixing grooves is slidably connected with the fixing strip.

7. The blade of claim 6, wherein, A plurality of fixing grooves are respectively arranged on both sides of the two limiting grooves, and one side of the plurality of fixing strips is respectively fixedly connected to both sides of the two limiting blocks.

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