Through-flow structure of steam turbine

Abstract

The utility model belongs to the technical field of steam turbines, and particularly relates to a steam turbine through-flow structure which comprises an outer cylinder, a steam exhaust cylinder and a rotating shaft, a steam inlet chamber is arranged in the outer cylinder, a front shaft sealing body is arranged between the rotating shaft and the outer cylinder, a steam exhaust end is arranged on the outer side of the steam exhaust cylinder, a static blade is arranged on the rotating shaft, a partition plate sleeve is arranged on the static blade, and a movable blade is arranged on the rotating shaft. The static blade comprises an ejection piece, a hinge, an open groove, an ejection plate, a rotating shaft, an ejection spring and a stress rod. Through the ejection piece, the hinge, the jacking plate, the rotating shaft, the jacking spring and the stress rod, the pressure borne by the stationary blade is reduced, the stationary blade is strengthened through the stress rod, the output power of the steam turbine can be improved by increasing the input pressure of external steam, meanwhile, the stability and the pressure bearing effect of the stationary blade are guaranteed, and the service life of the steam turbine is prolonged. The stationary blades can be self-adaptive according to the size of the passing steam, so that the pressure of the steam ejected between the stationary blades is always ensured to be sufficient, and the attenuation efficiency in the subsequent steam conveying process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a steam turbine flow-through structure. Background Art

[0002] The flow structure of a steam turbine refers to the flow channel structure inside the turbine, which has a vital impact on the performance and efficiency of the turbine. The design of the flow structure involves the flow characteristics of the airflow, the shape and arrangement of the blades, and the geometry of the flow channel. In a steam turbine, the gas flows from the high-pressure side to the low-pressure side, pushing the blades to rotate to generate kinetic energy and drive the mechanical device to work. The design of the flow structure needs to consider how to maximize the speed and pressure of the airflow to improve the power output and efficiency of the steam turbine.

[0003] The prior art has the following shortcomings: Application No. 202311089518.2 in the prior art proposes a steam turbine flow structure, including an inner cylinder, a rotor, moving blades, a holding ring, stationary blades and a steam seal; the two ends of the inner cylinder are through-set; one side of the holding ring is connected to the inner cylinder, and the stationary blades and the moving blades are both installed on the other side of the holding ring; the rotor is connected to the side of the moving blades away from the holding ring; the steam seal is arranged between the stationary blades and the rotor, and is used to control the steam leakage of the stationary blades.

[0004] When the above equipment is in use, the stationary blades do not need to bear the force of the pressure difference before and after the partition, and a better blade shape can be used. Compared with the impulse steam turbine, the bulkhead structure with large mass and poor precision can be discarded, and the axial flow size can be reduced. During the operation of the steam turbine, the stationary blades and the moving blades are the main structures, and the two complement each other. The steam fluid is compressed through the stationary blades and passed to the moving blades and drives the moving blades, which inevitably produces a pressure difference. If the specifications or performance of the stationary blades are changed, it will directly affect the operation effect of the steam turbine, and the power of the steam turbine cannot be increased by increasing the pressure of the steam introduced. At the same time, the structure of the stationary blades is single. When steam passes through, the gap between the stationary blades is fixed during the process of steam passing through the stationary blades. The ejected steam pressure is only affected by the pressure when the steam is introduced and the subsequent steam attenuation. The power given to the steam through the stationary blades cannot be adapted to the size of the steam pressure passing through. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a steam turbine flow-through structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine flow structure, comprising an outer cylinder, an exhaust cylinder, and a rotating shaft, wherein a steam inlet chamber is arranged in the outer cylinder, a front shaft sealing body is arranged between the rotating shaft and the outer cylinder, an exhaust end is arranged on the outer side of the exhaust cylinder, stationary blades are arranged on the rotating shaft, a partition sleeve is arranged on the stationary blades, and moving blades are arranged on the rotating shaft;

[0007] The stationary blade includes an ejector, a hinge, a slot, a lift plate, a rotating shaft, a tensioning spring and a force rod. A hinge is arranged between the ejector and the stationary blade. A slot is arranged on the back of the ejector, a lift plate is arranged in the slot, a tensioning spring is arranged on the lift plate, a rotating shaft is arranged between the lift plate and the ejector, and a force rod is arranged in the stationary blade.

[0008] As a preferred technical solution of the utility model: the steam inlet chamber is communicated with the space where the stationary blades are located, and the exhaust end is communicated with the exhaust cylinder.

[0009] As a preferred technical solution of the utility model: a groove adapted to the ejector is opened on the inner side of the stationary blade, and the ejector is hinged to the stationary blade through a hinge.

[0010] As a preferred technical solution of the utility model: the ejection plate is adapted to the slot, and the ejection plate is rotatably connected to the back of the ejection member via a rotating shaft.

[0011] As a preferred technical solution of the utility model: there are several groups of the stationary blades, and the back of each group of the stationary blades is provided with two groups of slots and ejection pieces.

[0012] As a preferred technical solution of the utility model: two groups of tension springs are fixed in each group of the slots, and the other ends of the tension springs are fixedly connected to the lifting plate.

[0013] As a preferred technical solution of the utility model: the front shaft sealing body is rotatably installed between the outer cylinder and the rotating shaft, and the exhaust cylinder is also connected to the space where the stationary blades are located.

[0014] Compared with the prior art, the utility model provides a steam turbine flow structure, which has the following beneficial effects:

[0015] 1. A steam turbine flow structure is provided with an ejector, a hinge, a lifting plate, a rotating shaft, a tightening spring and a force rod. During steam transportation, pressure acts on the ejector first, and the ejector is stressed to contract the tightening spring. The tightening spring can play a buffering role, reduce the pressure on the stationary blades for the first time, and ensure the normal steam output pressure. The reduction of the pressure on the stationary blades and the strengthening of the stationary blades themselves by the force rods can improve the output power of the steam turbine by increasing the input pressure of external steam, while ensuring the stability of the stationary blades and the pressure-bearing effect.

[0016] 2. A steam turbine flow structure is provided with ejectors, hinges, lift plates, rotating shafts, and tightening springs. When steam passes through the gap between the stationary blades, if the steam pressure is relatively small, the pressure on the ejectors will be relatively small. At this time, a smaller gap can be formed between the two groups of stationary blades due to the existence of the ejectors, and the steam can be ejected with a larger pressure. On the contrary, if the passing steam pressure is greater, the ejectors are closer to the stationary blades, and the gap between the two groups of stationary blades can be restored to normal, maintaining normal steam ejection. The stationary blades can adapt themselves according to the size of the passing steam, always ensuring that the steam pressure ejected between the stationary blades is sufficient, thereby reducing the attenuation efficiency in the subsequent steam transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a longitudinal section view of the flow passage portion of the steam turbine of the utility model;

[0018] Figure 2 This is a schematic diagram of the stationary blades and moving blades of the utility model;

[0019] Figure 3 For this utility model Figure 2 A magnified schematic diagram;

[0020] Figure 4 This is a schematic diagram of the back structure of the lifting plate of the utility model;

[0021] Figure 5 This is a schematic diagram of the installation of the force-bearing rod of the utility model.

[0022] In the figure: 1. outer cylinder; 2. exhaust cylinder; 3. rotating shaft; 4. steam inlet chamber; 5. stationary blades; 501. ejector; 502. hinge; 503. slot; 504. lifting plate; 505. rotating shaft; 506. tightening spring; 507. force rod; 6. partition sleeve; 7. front shaft seal; 8. exhaust end; 9. moving blades. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-5 In this embodiment: a steam turbine flow structure includes an outer cylinder 1, an exhaust cylinder 2, and a rotating shaft 3. A steam inlet chamber 4 is arranged in the outer cylinder 1, a front shaft sealing body 7 is arranged between the rotating shaft 3 and the outer cylinder 1, an exhaust end 8 is arranged on the outer side of the exhaust cylinder 2, a stationary blade 5 is arranged on the rotating shaft 3, a partition sleeve 6 is arranged on the stationary blade 5, and a moving blade 9 is arranged on the rotating shaft 3;

[0025] The stationary blade 5 includes an ejector 501, a hinge 502, a slot 503, a lift plate 504, a rotating shaft 505, a tensioning spring 506 and a force rod 507. A hinge 502 is arranged between the ejector 501 and the stationary blade 5. A slot 503 is arranged on the back of the ejector 501. A lift plate 504 is arranged in the slot 503. A tensioning spring 506 is arranged on the lift plate 504. A rotating shaft 505 is arranged between the lift plate 504 and the ejector 501. A force rod 507 is arranged in the stationary blade 5.

[0026] In this embodiment, the steam inlet chamber 4 is connected to the space where the stationary blades 5 are located, and the exhaust end 8 is connected to the exhaust cylinder 2;

[0027] Specifically, the external output steam can be introduced into the device through the steam inlet chamber 4 to contact the stationary blades 5, and the steam in the device can be easily discharged through the exhaust cylinder 2;

[0028] In this embodiment, a groove adapted to the ejector 501 is provided on the inner side of the stationary blade 5, and the ejector 501 is hinged to the stationary blade 5 through a hinge 502;

[0029] Specifically, the ejector 501 can be flexibly rotated and installed on the stationary blade 5 through the hinge 502;

[0030] In this embodiment, the lift plate 504 is adapted to the slot 503, and the lift plate 504 is rotatably connected to the back of the ejector 501 via a rotating shaft 505;

[0031] Specifically, the ejector 501 can be supported by the ejector plate 504, and the rotation effect of the ejector plate 504 on the ejector 501 can be ensured by the rotating shaft 505;

[0032] In this embodiment, there are several groups of stationary blades 5, and the back of each group of stationary blades 5 is provided with two groups of slots 503 and ejector parts 501;

[0033] Specifically, the slot 503 can provide a placement space for the adapting lift plate 504, and the steam passing through the stationary blade 5 can be compressed and ejected to act on the moving blade 9;

[0034] In this embodiment, two groups of tension springs 506 are fixed in each group of slots 503, and the other ends of the tension springs 506 are fixedly connected to the lifting plate 504;

[0035] Specifically, the tension spring 506 can play a buffering role between the ejector 501 and the stationary blade 5;

[0036] In this embodiment, the front shaft sealing body 7 is rotatably installed between the outer cylinder 1 and the rotating shaft 3, and the exhaust cylinder 2 is also connected to the space where the stationary blades 5 are located.

[0037] The working principle and use process of the utility model are as follows: in actual use, external steam is transported to the steam inlet chamber 4 through the corresponding delivery pipeline, and the steam contacts the stationary blades 5 through the steam inlet chamber 4. After passing through the stationary blades 5, the steam acts on the moving blades 9, thereby causing the moving blades 9 to rotate, and transmits power outward through the rotating shaft 3. After passing through a plurality of groups of stationary blades 5 and moving blades 9 in sequence, the steam enters the exhaust cylinder 2 and is discharged from the exhaust end 8. In the above process, when the steam passes through the stationary blades 5, the pressure of the steam preferentially acts on the ejector 501, and the ejector 501 is stressed to cause the tightening spring 506 to contract, which can play a buffering effect, reduce the pressure on the stationary blades 5 at the first time, and ensure the normal steam output pressure. Combined with the force-bearing rod 50 7 Strengthening of the stator blades 5 themselves can improve the output power of the steam turbine by increasing the input pressure of external steam, while ensuring the stability and pressure-bearing effect of the stator blades 5. At the same time, when the steam passes through the gap between the stator blades 5, if the steam pressure is small, the pressure on the ejector 501 will be small. Due to the existence of the ejector 501, a smaller gap can be formed between the two groups of stator blades 5, and the steam can be ejected with a larger pressure. On the contrary, the greater the pressure of the passing steam, the closer the ejector 501 is to the stator blades 5, maintaining normal steam ejection, and the stator blades 5 can adapt themselves according to the size of the passing steam, always ensuring that the steam pressure ejected between the stator blades 5 is sufficient, reducing the attenuation efficiency in the subsequent steam transportation process.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steam turbine flow structure, comprising an outer cylinder (1), an exhaust cylinder (2), and a rotating shaft (3), wherein a steam inlet chamber (4) is arranged in the outer cylinder (1), a front shaft sealing body (7) is arranged between the rotating shaft (3) and the outer cylinder (1), and an exhaust end (8) is arranged outside the exhaust cylinder (2), characterized in that: The rotating shaft (3) is provided with a stationary blade (5), the stationary blade (5) is provided with a partition sleeve (6), and the rotating shaft (3) is provided with a moving blade (9); The stationary blade (5) comprises an ejector (501), a hinge (502), a slot (503), a lift plate (504), a rotating shaft (505), a tensioning spring (506) and a force-bearing rod (507); a hinge (502) is arranged between the ejector (501) and the stationary blade (5); a slot (503) is arranged on the back of the ejector (501); a lift plate (504) is arranged in the slot (503); a tensioning spring (506) is arranged on the lift plate (504); a rotating shaft (505) is arranged between the lift plate (504) and the ejector (501); and a force-bearing rod (507) is arranged in the stationary blade (5).

2. A steam turbine flow structure according to claim 1, characterized in that: The steam inlet chamber (4) is in communication with the space where the stationary blades (5) are located, and the steam exhaust end (8) is in communication with the steam exhaust cylinder (2).

3. A steam turbine flow structure according to claim 1, characterized in that: A groove adapted to the ejector (501) is provided on the inner side of the stationary blade (5), and the ejector (501) is hinged to the stationary blade (5) via a hinge (502).

4. A steam turbine flow structure according to claim 1, characterized in that: The lifting plate (504) is adapted to the slot (503), and the lifting plate (504) is rotatably connected to the back of the ejector (501) via a rotating shaft (505).

5. The steam turbine flow structure according to claim 1, characterized in that: There are a total of several groups of stationary blades (5), and the back of each group of stationary blades (5) is provided with two groups of slots (503) and a ejector (501).

6. A steam turbine flow structure according to claim 1, characterized in that: Two groups of tensioning springs (506) are fixed in each group of the slots (503), and the other ends of the tensioning springs (506) are fixedly connected to the lifting plate (504).

7. A steam turbine flow structure according to claim 1, characterized in that: The front shaft sealing body (7) is rotatably mounted between the outer cylinder (1) and the rotating shaft (3), and the exhaust cylinder (2) is also connected to the space where the stationary blades (5) are located.

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