Cylinder steam inlet structure and low-pressure single-cylinder impulse type turboset

Abstract

The utility model discloses a cylinder steam inlet structure and a low-pressure single-cylinder impulse type steam turbine set, and relates to the technical field of steam turbines. In order to solve the problems that when an existing regulating valve is started, large pressure difference exists before and after the regulating valve is started, so that the valve is more difficult to open, the starting time is longer, and the working efficiency of the valve is reduced. The device comprises a high-pressure outer cylinder, a first steam guide pipe, a main steam valve, an adjusting valve, a starting valve and a second steam guide pipe, one end of the first steam guide pipe is communicated with the high-pressure outer cylinder, the main steam valve and the adjusting valve are installed on the first steam guide pipe, the main steam valve is located on the side away from the high-pressure outer cylinder, and the adjusting valve is located on the side close to the high-pressure outer cylinder. The starting valve is installed at the top of the high-pressure outer cylinder, when the unit is started, the main steam valve is opened firstly, at the moment, steam enters the high-pressure outer cylinder through the second steam guide pipe and the starting valve, therefore, the pressure difference between the high-pressure outer cylinder and the adjusting valve is reduced, at the moment, the adjusting valve is more convenient to open, the needed starting time is shorter, and the working efficiency is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine technical field, concretely relates to a steam cylinder admission structure and low pressure single cylinder impulse steam turbine unit. BACKGROUND

[0002] The steam turbine regulating valve is an extremely important component of the steam turbine, which controls the operation of the steam turbine, adjusts the steam admission of the steam turbine, and further controls the start and stop of the steam turbine and the speed of operation and the power emitted after grid connection.

[0003] In the prior art, there is a large pressure difference before and after the regulating valve during startup, which increases the opening torque of the valve, making it more difficult to open the valve, requiring more time to start, and thus reducing the working efficiency of the valve.

[0004] In summary, the existing regulating valve has a large pressure difference before and after the valve during startup, making it more difficult to open the valve, requiring more time to start, and thus reducing the working efficiency of the valve. SUMMARY

[0005] The utility model aims at solving the problem of a large pressure difference before and after the regulating valve during startup, making it more difficult to open the valve, requiring more time to start, and thus reducing the working efficiency of the valve. Further, a steam cylinder admission structure and low pressure single cylinder impulse steam turbine unit are provided.

[0006] The technical solution of the utility model is: a steam cylinder admission structure, comprising: a high-pressure outer cylinder, a first steam guide pipe, a main steam valve, a regulating valve, a starting valve, and a second steam guide pipe, one end of the first steam guide pipe is in communication with the high-pressure outer cylinder, the main steam valve and the regulating valve are installed on the first steam guide pipe, the main steam valve is located on the side away from the high-pressure outer cylinder, and the regulating valve is located on the side close to the high-pressure outer cylinder.

[0007] The starting valve is installed on the top of the high-pressure outer cylinder, one end of the second steam guide pipe is in communication with the steam inlet of the starting valve, the other end of the second steam guide pipe is in communication with the part between the main steam valve and the regulating valve on the first steam guide pipe, and the starting valve is adapted to be connected with an external power device.

[0008] Further, the main steam valve and the regulating valve are located below the high-pressure outer cylinder and are hung on the steam turbine foundation by a hanger.

[0009] A low-pressure single-cylinder impulse steam turbine unit, comprising: a front base frame, a rear base frame, a front bearing box, a rear bearing box, a support bearing, a low-pressure exhaust cylinder, a rotor, a stationary blade, a moving blade, a high-pressure steam seal, a low-pressure steam seal, a turning gear and a cylinder steam inlet structure as described in the above solution, the front base frame and the rear base frame are fixedly installed on a steam turbine foundation, the front bearing box is installed on the front base frame, the rear bearing box is installed on the rear base frame, the support bearing is installed on the front bearing box and the rear bearing box respectively, the rotor is rotatably installed on the two support bearings, and the moving blade is installed on the rotor;

[0010] The low-pressure exhaust cylinder is fixedly installed on the steam turbine foundation and connected with the rear bearing box, the high-pressure outer cylinder of the cylinder steam inlet structure is installed on the front bearing box, and the high-pressure outer cylinder is connected with the low-pressure exhaust cylinder through a vertical flange bolt;

[0011] The high-pressure outer cylinder is connected with a steam inlet balance ring, a first-stage partition plate, a second-stage partition plate, a third-stage partition plate, a fourth-stage partition plate, a fifth-stage partition plate and a sixth-stage partition plate, and the stationary blade is installed on the plurality of partition plates respectively;

[0012] The high-pressure steam seal is installed at the end of the high-pressure outer cylinder, and the low-pressure steam seal is installed at the end of the low-pressure exhaust cylinder through a corrugated joint;

[0013] The turning gear is installed at the top of the rear bearing box and connected with the rotor through a turning gear gear inside the rear bearing box.

[0014] Further, the front bearing box is slidingly installed on the front base frame, and the high-pressure outer cylinder is connected with the front bearing box through a centering beam, so that when the unit expands or shrinks, the high-pressure outer cylinder pushes the front bearing box to slide on the platform of the front base frame through the centering beam.

[0015] Further, the expansion joint is arranged between the low-pressure exhaust cylinder and the rear bearing box.

[0016] Further, the steam turbine foundation is integrally formed with the front base frame and the rear base frame.

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

[0018] 1、 the cylinder steam inlet structure provided by the utility model, when the unit starts, the main steam valve is opened first, at this time, steam enters into the high-pressure outer cylinder through the second steam guide pipe and the starting valve, so that the pressure difference between the high-pressure outer cylinder and the adjusting valve is reduced, at this time, the opening of the adjusting valve is more convenient, the required starting time is shorter, and the working efficiency is higher.

[0019] 2. The steam cylinder inlet structure provided by the utility model, the main steam valve and the adjusting valve are arranged below the high-pressure outer cylinder, which can shorten the distance from the main steam valve to the high-pressure outer cylinder, increase the stability of the high-pressure outer cylinder and reduce the length of the main steam pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the low-pressure single-cylinder impulse steam turbine unit of the utility model;

[0021] Figure 2 is Figure 1 a top view of

[0022] Figure 3 is Figure 1 a sectional view of

[0023] Figure 4 is Figure 3 an enlarged view of the A area in

[0024] In the drawing: 1, high-pressure outer cylinder; 2, first steam guide pipe; 3, main steam valve; 4, adjusting valve; 5, starting valve; 6, second steam guide pipe; 7, steam turbine base; 8, front base support; 9, rear base support; 10, front bearing box; 11, rear bearing box; 12, supporting bearing; 13, low-pressure exhaust cylinder; 14, rotor; 15, static blade; 16, dynamic blade; 17, high-pressure steam seal; 18, low-pressure steam seal; 19, turning gear device; 20, steam inlet balance ring; 21, first-stage partition plate; 22, second-stage partition plate; 23, third-stage partition plate; 24, fourth-stage partition plate; 25, fifth-stage partition plate; 26, sixth-stage partition plate; 27, corrugated section; 28, centering beam; 29, expansion joint. DETAILED DESCRIPTION

[0025] Specific implementation one: the embodiment is described in combination with Figure 1 , Figure 2 , and the embodiment comprises a high-pressure outer cylinder 1, a first steam guide pipe 2, a main steam valve 3, an adjusting valve 4, a starting valve 5 and a second steam guide pipe 6, one end of the first steam guide pipe 2 is in communication with the high-pressure outer cylinder 1, the main steam valve 3 and the adjusting valve 4 are installed on the first steam guide pipe 2, the main steam valve 3 is located on the side far away from the high-pressure outer cylinder 1, the adjusting valve 4 is located on the side close to the high-pressure outer cylinder 1, the starting valve 5 is installed on the top of the high-pressure outer cylinder 1, one end of the second steam guide pipe 6 is in communication with the steam inlet of the starting valve 5, the other end of the second steam guide pipe 6 is in communication with the part of the first steam guide pipe 2 between the main steam valve 3 and the adjusting valve 4, the starting valve 5 is suitable for being connected with an external power device, the type of the adjusting valve 4 is a disc valve, and the external power device can be an oil motor, and it is more convenient that the oil motor drives the starting valve 5.

[0026] The cylinder inlet structure of the embodiment, when the unit starts, the main steam valve 3 is opened first, at this time the steam enters into the high-pressure outer cylinder 1 through the second steam guide pipe 6 and the starting valve 5, thereby reducing the pressure difference between the high-pressure outer cylinder 1 and the adjusting valve 4, at this time the opening of the adjusting valve 4 is more convenient, the required starting time is shorter, and the working efficiency is higher.

[0027] Specific embodiment two: combined Figure 1 、 Figure 2 The embodiment is described, and the difference between the embodiment and the specific embodiment one is that the main steam valve 3 and the adjusting valve 4 are located below the high-pressure outer cylinder 1 and are hung on the steam turbine foundation 7 through a hanger, the steam turbine foundation 7 is a mounting platform for mounting the steam turbine unit, the main steam valve 3 and the adjusting valve 4 are arranged below the high-pressure outer cylinder 1, the distance from the main steam valve 3 to the high-pressure outer cylinder 1 can be shortened, the stability of the high-pressure outer cylinder 1 is increased, and the length of the main steam pipeline is reduced. The other components and connection relationships are the same as those of the specific embodiment one.

[0028] Specific embodiment three: combined Figures 1 to 4 The embodiment is described, and the embodiment includes a front base frame 8, a rear base frame 9, a front bearing box 10, a rear bearing box 11, a support bearing 12, a low-pressure exhaust cylinder 13, a rotor 14, a stationary blade 15, a moving blade 16, a high-pressure steam seal 17, a low-pressure steam seal 18, a turning gear device 19, and the above-mentioned cylinder inlet structure, the front base frame 8 and the rear base frame 9 are fixedly installed on the steam turbine foundation 7, the front bearing box 10 is installed on the front base frame 8, the rear bearing box 11 is installed on the rear base frame 9, the support bearing 12 is installed on the front bearing box 10 and the rear bearing box 11 respectively, the rotor 14 is rotatably installed on the two support bearings 12, the moving blade 16 is installed on the rotor 14, the relative dead point of the rotor 14 is the working surface of the thrust disc of the rotor 14 and the support bearing 12, when the unit expands or shrinks, the rotor 14 expands or shrinks to the motor end with the surface point, the high-pressure steam seal 17 is in a separate form.

[0029] The low-pressure exhaust cylinder 13 is fixedly installed on the steam turbine foundation 7 and is connected with the rear bearing box 11, the high-pressure outer cylinder 1 of the cylinder inlet structure is installed on the front bearing box 10, the high-pressure outer cylinder 1 is connected with the low-pressure exhaust cylinder 13 through vertical flange bolts, the high-pressure outer cylinder 1 is connected with an inlet balance ring 20, a first-stage partition plate 21, a second-stage partition plate 22, a third-stage partition plate 23, a fourth-stage partition plate 24, a fifth-stage partition plate 25, and a sixth-stage partition plate 26, the stationary blade 15 is installed on the plurality of partition plates respectively, the high-pressure steam seal 17 is installed at the end of the high-pressure outer cylinder 1, the low-pressure steam seal 18 is installed at the end of the low-pressure exhaust cylinder 13 through a corrugated joint 27, and the turning gear device 19 is installed on the top of the rear bearing box 11 and is connected with the rotor 14 through a turning gear gear inside the rear bearing box 11.

[0030] The low-pressure single-cylinder impulse turbine unit of the embodiment can reduce the pressure difference before and after the regulating valve 4 before the regulating valve 4 is started, thereby reducing the opening torque of the regulating valve 4, and making the opening speed of the regulating valve 4 faster.

[0031] Specific embodiment four: combination Figure 3 The embodiment is described, and the difference between the embodiment and the specific embodiment three is that the front bearing box 10 is slidingly installed on the front base frame 8, and the high-pressure outer cylinder 1 is connected with the front bearing box 10 through the centering beam 28; when the unit expands or shrinks, the high-pressure outer cylinder 1 pushes the front bearing box 10 to slide on the table plate of the front base frame 8 through the centering beam 28; specifically, the high-pressure outer cylinder 1 is installed on the front bearing box 10 through a key pin structure, the key pin can play a positioning function, so that the high-pressure outer cylinder 1 is accurately connected with the front bearing box 10; the sliding of the front bearing box 10 offsets the expansion or shrinkage of the unit, so that the unit runs more stably; and other components and connection relationships are the same as those of the specific embodiment three.

[0032] Specific embodiment five: combination Figure 3 The embodiment is described, and the difference between the embodiment and the specific embodiment four is that the embodiment further comprises an expansion joint 29 arranged between the low-pressure exhaust cylinder 13 and the rear bearing box 11; when the unit expands or shrinks, the expansion joint 29 absorbs the expansion amount to ensure that the rear bearing box 11 does not bear the push-pull force, and the structural stability is maintained; and other components and connection relationships are the same as those of the specific embodiment four.

[0033] Specific embodiment six: combination Figure 3 The embodiment is described, and the difference between the embodiment and the specific embodiment three is that the turbine foundation 7 is integrally formed with the front base frame 8 and the rear base frame 9; the front base frame 8 and the rear base frame 9 are fixed as a whole with the turbine foundation 7 when the turbine foundation 7 is poured, the fixing effect is better, and the strength is higher; and other components and connection relationships are the same as those of the specific embodiment three.

[0034] Working principle of the embodiment:

[0035] When the unit is started, the main steam valve 3 is opened first; at this time, steam enters the high-pressure outer cylinder 1 through the second steam guide pipe 6 and the starting valve 5, thereby reducing the pressure difference between the high-pressure outer cylinder 1 and the regulating valve 4, making the opening of the regulating valve 4 more convenient, the required starting time shorter, and the working efficiency higher; then the regulating valve 4 is started to adjust the flow of steam, and the steam enters the high-pressure outer cylinder 1 through the regulating valve 4.

[0036] The content of the utility model is not limited to the content of the above-mentioned embodiments, and one or several specific embodiments can also achieve the purpose of the utility model.

Claims

1. A cylinder steam inlet structure, comprising: A high-pressure outer cylinder (1), a first steam guide pipe (2), a main steam valve (3), a regulating valve (4), a starting valve (5) and a second steam guide pipe (6), wherein one end of the first steam guide pipe (2) is connected to the high-pressure outer cylinder (1), the main steam valve (3) and the regulating valve (4) are installed on the first steam guide pipe (2), the main steam valve (3) is located on a side away from the high-pressure outer cylinder (1), and the regulating valve (4) is located on a side close to the high-pressure outer cylinder (1); It is characterized in that the starting valve (5) is installed on the top of the high-pressure outer cylinder (1), one end of the second steam pipe (6) is connected to the steam inlet of the starting valve (5), and the other end of the second steam pipe (6) is connected to the part between the main steam valve (3) and the regulating valve (4) on the first steam pipe (2), and the starting valve (5) is suitable for connection to an external power device.

2. The cylinder steam inlet structure according to claim 1, characterized in that: The main steam valve (3) and the regulating valve (4) are located below the high-pressure outer cylinder (1) and are suspended on the turbine foundation (7) via a suspension bracket.

3. A low-pressure single-cylinder impulse steam turbine unit, characterized in that: include: A front base frame (8), a rear base frame (9), a front bearing box (10), a rear bearing box (11), a support bearing (12), a low-pressure exhaust cylinder (13), a rotor (14), a stationary blade (15), a moving blade (16), a high-pressure steam seal (17), a low-pressure steam seal (18), a turning device (19), and a cylinder steam inlet structure according to claim 1 or 2, wherein the front base frame (8) and the rear base frame (9) are fixedly mounted on a turbine foundation (7), the front bearing box (10) is mounted on the front base frame (8), the rear bearing box (11) is mounted on the rear base frame (9), the support bearings (12) are respectively mounted on the front bearing box (10) and the rear bearing box (11), the rotor (14) is rotatably mounted on the two support bearings (12), and the moving blades (16) are mounted on the rotor (14); The low-pressure exhaust cylinder (13) is fixedly mounted on the turbine foundation (7) and connected to the rear bearing box (11); the high-pressure outer cylinder (1) of the cylinder steam inlet structure is mounted on the front bearing box (10); the high-pressure outer cylinder (1) is connected to the low-pressure exhaust cylinder (13) via vertical flange bolts; The high-pressure outer cylinder (1) is connected to a steam inlet balance ring (20), a first-stage partition (21), a second-stage partition (22), a third-stage partition (23), a fourth-stage partition (24), a fifth-stage partition (25), and a sixth-stage partition (26), and the stationary blades (15) are respectively mounted on the plurality of partitions. The high-pressure steam seal (17) is installed at the end of the high-pressure outer cylinder (1), and the low-pressure steam seal (18) is installed at the end of the low-pressure exhaust cylinder (13) through a bellows section (27); The turning gear device (19) is installed on the top of the rear bearing box (11) and is connected to the rotor (14) inside the rear bearing box (11) through a turning gear.

4. A low-pressure single-cylinder impulse steam turbine unit according to claim 3, characterized in that: The front bearing box (10) is slidably mounted on the front base frame (8), and the high-pressure outer cylinder (1) is connected to the front bearing box (10) via a centering beam (28). When the unit expands or contracts, the high-pressure outer cylinder (1) pushes the front bearing box (10) to slide on the table of the front base frame (8) via the centering beam (28).

5. A low-pressure single-cylinder impulse steam turbine unit according to claim 4, characterized in that: Also includes: An expansion joint (29) is provided between the low-pressure exhaust cylinder (13) and the rear bearing box (11).

6. The low-pressure single-cylinder impulse steam turbine unit according to claim 3, characterized in that: The steam turbine foundation (7), the front base frame (8) and the rear base frame (9) are integrally formed.

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