Steam turbine for energy-saving power plant

Abstract

The utility model provides an energy-saving steam turbine for a power plant, belongs to the technical field of steam turbines, and aims to solve the problems that when a connecting pipeline of an existing steam turbine for the power plant is installed, traditional manual operation lacks a guiding mechanism for sequentially screwing opposite angles of connecting bolts, and uneven stress of a flange connecting surface is easily caused; the steam turbine sealing device comprises a high-pressure cylinder, a transmission box, a guide disc, a guide assembly and a positioning assembly. The transmission box is fixedly connected to the outer side of the right end of the first connecting pipe; the guide disc is rotationally connected to the outer side of the right end of the first connecting pipe; the guide assembly is arranged in the transmission box and below the transmission box; and the positioning assembly is arranged at the top of the second connecting pipe. The connecting bolt can be guided to be screwed according to the diagonal sequence, it is guaranteed that the pre-tightening force of the connecting bolts is uniform, the connecting angle is automatically corrected through the conical positioning column, and the connecting sealing performance and the installing standardability are systematically improved from the installing technology level.

Description

Technical Field

[0001] This utility model belongs to the field of steam turbine technology, and more specifically, it relates to an energy-saving steam turbine for power plants. Background Technology

[0002] As the core equipment for converting steam thermal energy into mechanical energy, the development of steam turbines in power plants has undergone technological iterations from single-stage impulse turbines to multi-stage reaction turbines. They are widely used in thermal power, nuclear power and other fields. In order to improve energy efficiency, steam turbine technology is gradually developing towards flow optimization, waste heat recovery and sealing improvement. For example, the use of bent and twisted blade design can improve stage efficiency by 1.5%-2%, and steam reheat cycle can reduce exhaust humidity and improve thermal efficiency. Existing energy-saving steam turbines for power plants generally consist of three cylinders: a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, a sealing system, impeller blades and a waste heat recovery system.

[0003] Existing application number: CN201821821291.0, this utility model discloses an energy-saving steam turbine for power plants, including a chassis, a steam boiler fixed to one end of the upper surface of the chassis, a flue pipe fixed above one end of the outer wall of the steam boiler, a vent pipe fixed above the other end of the outer wall of the steam boiler, a steam turbine fixed to one end of the outer wall of the vent pipe, and fan blades rotatably connected to one end of the inner wall of the steam turbine; the setting of a first protective sleeve and a first fixing ring makes it difficult for the pipe used by the steam boiler to transfer high-temperature steam to directly contact the air and lose heat, thereby reducing the amount of heat loss during the transfer process; the setting of a return pipe allows a large amount of heat contained in the flue gas to be recovered and utilized, which is beneficial to improving the heat utilization rate; the setting of a second protective sleeve and a second fixing ring reduces the heat lost to the air by the heat returning in the return pipe; the setting of a first gear and a second gear causes the first rotating shaft to drive the second rotating shaft to rotate.

[0004] Based on the above, the high-pressure cylinder, intermediate-pressure cylinder, and low-pressure cylinder of the steam turbine used in energy-saving power plants are mainly connected and sealed by connecting pipes, flanges, and bolts. Since steam flows in the pipeline for a long time, it is easy to cause scale to form inside the pipeline. Therefore, the connecting pipes need to be disassembled for cleaning and maintenance regularly. When the connected pipes are reinstalled after cleaning, traditional manual operation relies on experience to tighten the flange bolts. There is no forced diagonal sequence guidance mechanism, which can easily cause uneven stress on the flange connection surface due to improper operation, leading to problems such as flange displacement or sealing failure, ultimately affecting the sealing performance and energy-saving effect of the steam turbine. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides an energy-saving steam turbine for power plants. This addresses the issue that existing energy-saving steam turbines primarily rely on connecting pipes, flanges, and bolts for connection and sealing between the high-pressure, intermediate-pressure, and low-pressure cylinders. Because steam flows continuously within the pipes, scale buildup easily occurs, necessitating periodic disassembly and cleaning of the connecting pipes. When the cleaned connecting pipes are reinstalled, traditional manual operation relies on experience to tighten the flange bolts, lacking a forced diagonal sequence guidance mechanism. This can easily lead to uneven stress on the flange connection surface due to improper operation, resulting in flange misalignment or sealing failure, ultimately affecting the turbine's sealing performance and energy-saving effect.

[0006] The purpose and effectiveness of this energy-saving steam turbine for power plants are achieved through the following specific technical means:

[0007] An energy-saving steam turbine for power plants includes a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a first connecting pipe, a first flange, a second connecting pipe, a second flange, connecting bolts, a transmission box, a guide plate, a guiding assembly, and a positioning assembly. The intermediate-pressure cylinder is fixedly connected to the right side of the high-pressure cylinder; the low-pressure cylinder is fixedly connected to the right side of the intermediate-pressure cylinder; the left end of the first connecting pipe is fixedly connected to the top of the intermediate-pressure cylinder; the first flange is fixedly connected to the bottom of the right end of the first connecting pipe; the second connecting pipe is fixedly connected to the top of the low-pressure cylinder; the second flange is fixedly connected to the top of the second connecting pipe; six connecting bolts are provided, and the six connecting bolts are distributedly inserted inside the first flange and the second flange; the transmission box is fixedly connected to the outside of the right end of the first connecting pipe; the guide plate is rotatably connected to the outside of the right end of the first connecting pipe; the guiding assembly is disposed inside and below the transmission box; and the positioning assembly is disposed on the top of the second connecting pipe.

[0008] Furthermore, the guiding assembly includes: a moving rod, a transmission rack, and a transmission gear; the moving rod is slidably connected inside the transmission box; the transmission rack is fixedly connected to the left end of the moving rod; the transmission gear is rotatably connected inside the transmission box, and the transmission gear meshes with the transmission rack.

[0009] Furthermore, the guiding assembly also includes: a transmission ratchet, a transmission shaft, and a transmission pawl; the transmission ratchet is coaxially and fixedly connected to the lower part of the transmission gear; the transmission shaft is rotatably connected inside the transmission box; the transmission pawl is coaxially and fixedly connected to the top of the transmission shaft, and the transmission pawl meshes with the transmission ratchet.

[0010] Furthermore, the guiding assembly also includes: a first guiding gear and a second guiding gear; the first guiding gear is coaxially fixedly connected to the bottom of the transmission shaft; the second guiding gear is coaxially fixedly connected to the outside of the guide plate, and the second guiding gear meshes with the first guiding gear.

[0011] Furthermore, the guiding assembly also includes a return spring and a guide collar; the right end of the return spring is fixedly connected to the left end of the transmission rack, and the left end of the return spring is fixedly connected to the inside of the transmission box; two guide collars are provided, and the two guide collars are separately fixedly connected to the bottom of the guide plate.

[0012] Furthermore, the positioning component includes: a first connecting block, a tapered positioning post, a second connecting block, and a positioning hole; the first connecting block is fixedly connected to the bottom left side of the right end of the first connecting tube; the tapered positioning post is fixedly connected below the first connecting block; the second connecting block is fixedly connected to the top left side of the second connecting tube; and the positioning hole is formed inside the second connecting block.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] First, the guide assembly uses two guide collars to force the tightening sequence of the connecting bolts to be diagonal. The guide disc must rotate to align the next set of diagonal connecting bolts with the guide collar. All bolts must be tightened in this order. This improvement solves the problem of lack of sequential guidance in traditional manual operation, ensuring that the preload of the flange bolts is evenly distributed and avoiding flange offset or sealing failure caused by uneven force.

[0015] Secondly, a tapered positioning post and positioning hole are set up. The tapered structure automatically corrects the connection angle to ensure that the threaded holes of the first flange and the second flange are accurately aligned. This improvement solves the problem of easy displacement of flange holes in traditional installation, reduces manual alignment error, improves the installation efficiency of connecting pipes, lays the foundation for smooth bolt insertion and uniform tightening, and reduces the risk of poor sealing caused by position deviation, thereby enhancing the reliability of turbine operation.

[0016] This invention guides the connecting bolts to be tightened in a diagonal sequence, ensuring uniform preload on all connecting bolts and preventing flange misalignment or sealing failure caused by uneven force. It also features tapered positioning posts and holes, using the tapered structure to automatically correct the connection angle and achieve precise alignment of the flange threaded holes. This systematically improves connection sealing and installation standardization from an installation process perspective, and further reduces human error through standardized operating procedures, laying the foundation for efficient and stable operation and reduced maintenance costs for steam turbines used in power plants. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the first connecting pipe structure of this utility model.

[0019] Figure 3This is a schematic diagram of the guide disk structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the second flange structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the transmission shaft structure of this utility model.

[0022] Figure 6 This is a schematic diagram of the conical positioning column structure of this utility model.

[0023] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0024] 1. High-pressure cylinder; 2. Medium-pressure cylinder; 3. Low-pressure cylinder; 4. First connecting pipe; 401. First flange; 5. Second connecting pipe; 501. Second flange; 6. Connecting bolt; 7. Transmission box; 8. Moving rod; 801. Transmission rack; 802. Return spring; 9. Transmission gear; 901. Transmission ratchet; 10. Transmission shaft; 1001. Transmission pawl; 1002. First guide gear; 11. Guide plate; 1101. Second guide gear; 1102. Guide collar; 12. First connecting block; 1201. Conical positioning post; 13. Second connecting block; 1301. Positioning hole. Detailed Implementation

[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model. Example

[0026] As attached Figure 1 To be continued Figure 6 As shown:

[0027] This utility model provides an energy-saving steam turbine for power plants, including a high-pressure cylinder 1, an intermediate-pressure cylinder 2, a low-pressure cylinder 3, a first connecting pipe 4, a first flange 401, a second connecting pipe 5, a second flange 501, connecting bolts 6, a transmission box 7, a guide plate 11, and a guide assembly. The intermediate-pressure cylinder 2 is fixedly connected to the right side of the high-pressure cylinder 1; the low-pressure cylinder 3 is fixedly connected to the right side of the intermediate-pressure cylinder 2; the left end of the first connecting pipe 4 is fixedly connected to the top of the intermediate-pressure cylinder 2; the first flange 401 is fixedly connected to the bottom of the right end of the first connecting pipe 4; the second connecting pipe 5 is fixedly connected to the top of the low-pressure cylinder 3; the second flange 501 is fixedly connected to the top of the second connecting pipe 5; six connecting bolts 6 are provided, and the six connecting bolts 6 are distributed and inserted into the inside of the first flange 401 and the second flange 501; the transmission box 7 is fixedly connected to the outside of the right end of the first connecting pipe 4; the guide plate 11 is rotatably connected to the outside of the right end of the first connecting pipe 4; the guide assembly is disposed inside and below the transmission box 7.

[0028] The guiding assembly includes: a moving rod 8, a transmission rack 801, and a transmission gear 9; the moving rod 8 is slidably connected inside the transmission box 7; the transmission rack 801 is fixedly connected to the left end of the moving rod 8; the transmission gear 9 is rotatably connected inside the transmission box 7, and the transmission gear 9 meshes with the transmission rack 801.

[0029] The guide assembly also includes: a transmission ratchet 901, a transmission shaft 10, and a transmission pawl 1001; the transmission ratchet 901 is coaxially fixedly connected to the bottom of the transmission gear 9; the transmission shaft 10 is rotatably connected to the inside of the transmission box 7; the transmission pawl 1001 is coaxially fixedly connected to the top of the transmission shaft 10, and the transmission pawl 1001 meshes with the transmission ratchet 901.

[0030] The guide assembly also includes: a first guide gear 1002 and a second guide gear 1101; the first guide gear 1002 is coaxially fixedly connected to the bottom of the transmission shaft 10; the second guide gear 1101 is coaxially fixedly connected to the outside of the guide disk 11, and the second guide gear 1101 meshes with the first guide gear 1002.

[0031] The guide assembly also includes: a reset spring 802 and a guide collar 1102; the right end of the reset spring 802 is fixedly connected to the left end of the transmission rack 801, and the left end of the reset spring 802 is fixedly connected to the inside of the transmission box 7; two guide collars 1102 are provided, and the two guide collars 1102 are fixedly connected below the guide plate 11.

[0032] The specific usage and function of this embodiment are as follows: In use, firstly, multiple connecting bolts 6 are passed through the first flange 401 and the second connecting pipe 5 and initially tightened by hand. Then, the sleeve used for tightening the connecting bolts 6 is inserted from the guide ring 1102 and placed on the nut of the connecting bolt 6. Then, the first connecting bolt 6 is tightened. The other guide ring 1102 is on a diagonal line with the first guide ring 1102. Then, the connecting bolt 6 corresponding to this guide ring 1102 is tightened. Afterwards, the moving rod 8 is pushed to the left, and the gear and rack transmission mechanism formed by the meshing of the transmission gear 9 and the transmission rack 801 drives the transmission ratchet 901 to rotate. The transmission ratchet 901, through the ratchet and pawl transmission mechanism formed with the transmission pawl 1001, drives the transmission shaft 10 to rotate unidirectionally. Shaft 10 drives guide disc 11 to rotate through a gear transmission mechanism formed by the meshing of second guide gear 1101 and first guide gear 1002. This causes the two guide rings 1102 to rotate opposite each other, resulting in a set of diagonally arranged connecting bolts 6. Afterward, the moving rod 8 is released, and under the rebound action of the return spring 802, the moving rod 8 and the transmission rack 801 return to their original positions. Under the action of the ratchet and pawl transmission mechanism, the transmission shaft 10 will not rotate, thus keeping the guide disc 11 and the two guide rings 1102 in their current positions. After tightening this set of connecting bolts 6, the above operation can be repeated until all connecting bolts 6 are tightened. This mechanism can be used at the connecting flanges with connecting pipes above the high-pressure cylinder 1, medium-pressure cylinder 2, and low-pressure cylinder 3 to ensure that the sealing performance is not affected by the tightening of the connecting bolts 6. Example

[0033] Based on Example 1, as shown in the appendix Figure 1 To be continued Figure 6 As shown, it also includes a positioning component, which is located at the top of the second connecting pipe 5.

[0034] The positioning component includes: a first connecting block 12, a conical positioning post 1201, a second connecting block 13, and a positioning hole 1301; the first connecting block 12 is fixedly connected to the bottom left side of the right end of the first connecting pipe 4; the conical positioning post 1201 is fixedly connected to the bottom of the first connecting block 12; the second connecting block 13 is fixedly connected to the top left side of the second connecting pipe 5; and the positioning hole 1301 is formed inside the second connecting block 13.

[0035] The specific usage and function of this embodiment are as follows: When connecting the first connecting pipe 4 and the second connecting pipe 5, first align the tapered positioning post 1201 below the first connecting block 12 with the positioning hole 1301 inside the second connecting block 13 and insert it. Through the tapered mechanism at the bottom of the tapered positioning post 1201, the angle of the right end of the first connecting pipe 4 can be gradually corrected during the insertion process, ensuring that the threaded holes in the first flange 401 and the second connecting pipe 5 can be aligned precisely, laying a good foundation for the subsequent installation of the connecting bolt 6.

[0036] The following points should be noted in this article:

[0037] 1. The accompanying drawings of this embodiment only involve the structures involved in this embodiment; other structures can refer to the general design.

[0038] 2. Where there is no conflict, this embodiment and the features in the embodiment can be combined with each other to obtain new embodiments.

[0039] The above are merely specific implementations of this embodiment, but the protection scope of this embodiment is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this embodiment should be included within the protection scope of this embodiment. Therefore, the protection scope of this embodiment should be determined by the protection scope of the claims.

Claims

1. An energy-saving steam turbine for power plant, comprising a high-pressure cylinder (1), a medium-pressure cylinder (2), a low-pressure cylinder (3), a first connecting pipe (4), a first flange plate (401), a second connecting pipe (5), a second flange plate (501), a connecting bolt (6), a transmission box (7), a guide plate (11), a guide assembly and a positioning assembly; the medium-pressure cylinder (2) is fixedly connected to the right side of the high-pressure cylinder (1); the low-pressure cylinder (3) is fixedly connected to the right side of the medium-pressure cylinder (2); characterized in that: The left end of the first connecting pipe (4) is fixedly connected to the upper surface of the medium-pressure cylinder (2); the first flange plate (401) is fixedly connected to the bottom of the right end of the first connecting pipe (4); the second connecting pipe (5) is fixedly connected to the upper surface of the low-pressure cylinder (3); the second flange plate (501) is fixedly connected to the top of the second connecting pipe (5); six connecting bolts (6) are provided, and the six connecting bolts (6) are dispersedly inserted into the first flange plate (401) and the second flange plate (501); the transmission box (7) is fixedly connected to the outer side of the right end of the first connecting pipe (4); the guide disc (11) is rotatably connected to the outer side of the right end of the first connecting pipe (4); the guide assembly is arranged in the transmission box (7) and below; and the positioning assembly is arranged on the top of the second connecting pipe (5).

2. An energy saving steam turbine for power plant as claimed in claim 1 wherein: The guide assembly comprises a moving rod (8), a transmission rack (801) and a transmission gear (9); the moving rod (8) is slidably connected to the inside of the transmission box (7); the transmission rack (801) is fixedly connected to the left end of the moving rod (8); and the transmission gear (9) is rotatably connected to the inside of the transmission box (7) and is in engagement with the transmission rack (801).

3. An energy saving steam turbine for power plant as claimed in claim 2 wherein: The guide assembly further comprises a transmission ratchet (901), a transmission rotating shaft (10) and a transmission pawl (1001); the transmission ratchet (901) is coaxially fixedly connected to the lower surface of the transmission gear (9); the transmission rotating shaft (10) is rotatably connected to the inside of the transmission box (7); and the transmission pawl (1001) is coaxially fixedly connected to the top of the transmission rotating shaft (10) and is in engagement with the transmission ratchet (901).

4. An energy saving steam turbine for power plant as claimed in claim 3 wherein: The guide assembly further comprises a first guide gear (1002) and a second guide gear (1101); the first guide gear (1002) is coaxially fixedly connected to the bottom of the transmission rotating shaft (10); the second guide gear (1101) is coaxially fixedly connected to the outer side of the guide disc (11) and is in engagement with the first guide gear (1002).

5. An energy saving steam turbine for power plant as claimed in claim 2 wherein: The guide assembly further comprises a reset spring (802) and a guide sleeve ring (1102); the right end of the reset spring (802) is fixedly connected to the left end of the transmission rack (801), and the left end of the reset spring (802) is fixedly connected to the inside of the transmission box (7); and two guide sleeve rings (1102) are provided and are dispersedly fixedly connected to the lower surface of the guide disc (11).

6. An energy saving steam turbine for power plant as claimed in claim 1 wherein: The positioning assembly comprises a first connecting block (12), a tapered positioning column (1201), a second connecting block (13) and a positioning hole (1301); the first connecting block (12) is fixedly connected to the bottom left side of the right end of the first connecting pipe (4); the tapered positioning column (1201) is fixedly connected to the lower surface of the first connecting block (12); the second connecting block (13) is fixedly connected to the top left side of the second connecting pipe (5); and the positioning hole (1301) is formed in the inside of the second connecting block (13).

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