Steam turbine steam sealing device for enhancing steam guide sealing

Abstract

The invention discloses a steam turbine steam sealing device for enhancing steam guide sealing, and relates to the technical field of steam turbine steam sealing. A steam turbine steam seal device capable of enhancing steam guide sealing comprises a steam seal body, a steam seal cavity is formed in the radial inner side of the steam seal body, flow dividing steam guide teeth are installed in the steam seal cavity in a matched mode through small teeth in the cavity, and the flow dividing steam guide teeth are designed according to the form of the steam seal cavity and matched with the small teeth in the steam seal cavity to prevent the flow dividing steam guide teeth from disengaging. A plurality of diversion steam guide teeth are arranged between the diversion steam guide teeth and the steam seal body, the diversion steam guide teeth are used for separating the inlet of the steam seal cavity due to steam pressure, and a slope angle is formed between the tooth tip and the root of each diversion steam guide tooth and is distributed opposite to the rotating direction of the rotor; a large amount of steam rotationally adsorbed in the rotating direction of the shaft can be guided into the steam seal cavity through the flow guide teeth, steam flow kinetic energy rushing into the cavity due to inertia is consumed through the small teeth in the cavity, the steam is fully dissipated in the steam seal cavity, and the sealing and steam blocking effects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine steam seals, and in particular to a steam turbine steam seal device with enhanced steam guide seal. Background Art

[0002] In the actual application of steam turbines, there is a significant gap between their heat consumption efficiency and the design value. One of the most important reasons for the increase in heat consumption efficiency is the steam turbine body, among which the steam seal is a very critical component inside. Whether the performance of this component is superior or not will not only seriously affect the operating efficiency and economic efficiency of the entire unit, but also affect the safety and reliability of the entire unit. In the process of using traditional steam turbine technology for power generation, there is still a lot of room for improvement in relative internal efficiency. At present, an important factor for low power generation efficiency is that various losses will occur during actual production and operation. The steam turbine has two major parts: the stator and the rotor. When working, the rotor rotates at high speed and the stator is fixed, so a certain gap must be maintained between the rotor and the stator to prevent mutual friction. When steam flows through each stage of the steam turbine, the pressure and temperature decrease step by step, and there is a pressure difference on both sides of the partition. When the moving blade has a reaction degree, there is also a pressure difference before and after the moving blade. In addition to the vast majority of steam flowing through the channels of the guide vanes and moving blades to do work, a small part will flow through various gaps without doing work, which becomes a loss and reduces the efficiency of the unit. The rotor must also pass through the cylinder and be supported on the bearing, and a gap must be left here. For the two ends of the high-pressure cylinder and the front end of the medium-pressure cylinder, the steam pressure in the cylinder is greater than the external atmospheric pressure, and steam will leak out here, reducing the efficiency of the unit and causing some condensate loss.

[0003] A guide steam seal is a seal body with multiple chambers. However, the existing guide steam seal only has a guide structure for the rotor axial oblique side teeth to guide the airflow into the chamber. Due to the high-speed rotation of the rotor, the surrounding steam will be driven and rotate along the rotation direction of the shaft. The speed of the rotating flow is very fast, which will generate an outward centrifugal force and form a negative pressure area. A large amount of steam will be adsorbed around the shaft, resulting in less airflow entering the chamber. Therefore, further improving scientific and technological capabilities and timely developing efficient steam seals can effectively enhance the sealing effect of steam turbines, which is of great significance to improving the thermal efficiency of the unit and reducing heat consumption. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a turbine steam seal device with enhanced steam guide seal, which can solve the problem that when the rotor rotates at a high speed, the surrounding steam will be driven to rotate and flow along the rotation direction of the shaft. The speed of the rotating flow is very fast, which will generate an outward centrifugal force to form a negative pressure area. A large amount of steam will be adsorbed around the shaft, resulting in a smaller part of the airflow entering the chamber.

[0005] To achieve the above object, the present invention provides the following technical solution: a steam turbine steam seal device with enhanced steam guide seal, comprising a steam seal body, a steam seal chamber is provided on the radial inner side of the steam seal body, and a flow-dividing steam guide tooth is installed in the steam seal chamber through the engagement of small teeth in the chamber; Among them, the diverter steam guide tooth is designed according to the form of the steam seal chamber and fits with the small teeth in the steam seal chamber to prevent the diverter steam guide tooth from falling out. A limit pin is provided between the diverter steam guide tooth and the steam seal body to prevent the guide tooth from moving due to steam pressure.

[0006] Preferably, the split steam guide tooth and the steam seal arc segment are made of the same material and have the same length as each other.

[0007] Preferably, a groove which fits with a small tooth in the steam seal chamber is provided at the bottom connection of the diverter steam guide tooth.

[0008] Preferably, the split steam guide teeth have the same segmented form as the steam seal ring and are respectively embedded in each steam seal arc segment of the steam seal ring.

[0009] Preferably, the split steam guide tooth has a slope surface with a certain angle to the rotation direction of the rotor; Among them, the slope angle from the tip to the root of the split steam guide tooth is between 30° and 45°.

[0010] Preferably, after the steam seal chamber 5 is processed, it slides into the chamber along the inner wall of the chamber through the groove provided at the bottom connection of the diverter steam guide tooth, and the two ends are aligned with the steam seal arc segment.

[0011] Preferably, after the split steam guide teeth are installed flat, through holes are opened at the axial plane positions at both ends of the steam seal body, and the through holes penetrate each chamber and the split steam guide teeth in the chamber; Among them, a pin made of the same material as the steam seal body and fitting the through hole is passed through the through hole to fix the diverter steam guide teeth in each chamber, and riveted to fix them at the axial plane positions at both ends of the steam seal body.

[0012] Preferably, the split steam guide tooth is provided with a plurality of guide teeth according to the length of the steam seal arc segment; The groove at the entrance of the steam seal chamber is separated and the interior of the chamber is connected.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The steam turbine steam seal device with enhanced steam guide seal separates the entrance of the steam seal chamber by means of split steam guide teeth, and each split steam guide tooth has a slope angle between the tip and the root and is distributed relative to the rotation direction of the rotor, so that a large amount of steam adsorbed by the rotation direction of the shaft can be guided into the steam seal chamber through the guide teeth, and the kinetic energy of the steam rushing into the chamber due to inertia is consumed by the small teeth in the chamber, so that the steam is fully dissipated in the steam seal chamber, thereby achieving a sealing and steam-blocking effect.

[0014] 2. The steam turbine steam seal device with enhanced steam guide seal allows more steam to enter the steam seal chamber through the angle design of the split steam guide tooth. Due to the slope design of the split steam guide tooth and the fact that it is only set at the entrance, the chamber of the entire steam seal ring is still connected, making it easy for steam to enter but difficult to exit, and fully dissipated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the structure of the exterior of the steam seal chamber of the present invention; Figure 3 It is a schematic diagram of the structure of the exterior of the steam seal body of the present invention; Figure 4 It is a schematic diagram of the structure of the outer part of the steam seal ring of the present invention; Figure 5 It is a schematic diagram of the structure inside the steam seal ring of the present invention; Figure 6 It is a schematic diagram of the structure outside the arc segment of the present invention; Figure 7 It is a schematic diagram of the structure of the outer part of the split steam guide tooth of the present invention.

[0016] Figure numerals: 1. steam seal body; 2. diverter steam guide tooth; 3. groove; 4. steam seal ring; 5. steam seal chamber; 6. steam seal arc section; 7. small guide tooth. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0021] See also Figure 1-7 The present invention provides a technical solution: a steam turbine steam seal device with enhanced steam guide seal, comprising a steam seal body 1, a steam seal chamber 5 is opened on the radial inner side of the steam seal body, a diverter steam guide tooth 2 is installed in the steam seal chamber 5 through the engagement of small teeth in the chamber, the diverter steam guide tooth 2 is designed according to the form of the steam seal chamber and engages with the small teeth in the steam seal chamber to prevent the diverter steam guide tooth 2 from falling out, and a limit pin is arranged between the diverter steam guide tooth 2 and the steam seal body 1 to prevent the guide tooth from moving due to steam pressure.

[0022] The split steam guide tooth 2 and the steam seal arc segment 6 are made of the same material and have the same length as each other.

[0023] A groove 3 is provided at the bottom connection of the diverter steam guide tooth 2 , which is matched with the small tooth in the steam seal chamber 5 .

[0024] The split steam guide teeth 2 and the steam seal ring 4 have the same segmented form and are respectively embedded in each steam seal arc segment 6 of the steam seal ring 4 .

[0025] Among them, the split steam guide tooth 2 has a slope surface with a certain angle to the rotation direction of the rotor, and the slope angle from the tip to the root of the split steam guide tooth 2 is between 30° and 45°.

[0026] After the steam seal chamber 5 is processed, the groove 3 provided at the bottom connection of the diverter steam guide tooth 2 slides into the chamber along the inner wall of the chamber, and the two ends are aligned with the steam seal arc segment 6 in a flat manner.

[0027] Among them, after the split steam guide tooth 2 is installed flat, through holes are opened at the axial plane positions at both ends of the steam seal body 1, and the through holes penetrate each chamber and the split steam guide tooth 2 in the chamber, and then a pin made of the same material as the steam seal body 1 and fitting the through hole is used to pass through the through hole to fix the split steam guide tooth 2 in each chamber, and riveted points are used to fix it at the axial plane positions at both ends of the steam seal body 1.

[0028] The diverter steam guide tooth 2 is provided with a plurality of guide small teeth 7 according to the length of the steam seal arc segment 6, so as to separate the groove at the entrance of the steam seal chamber 5 and penetrate the interior of the chamber.

[0029] The entrance of the steam seal chamber 5 is separated by the diverter steam guide tooth 2, and the tip and root of each diverter steam guide tooth 2 have a slope angle and are distributed relative to the rotation direction of the rotor. A large amount of steam that is rotated and adsorbed along the direction of shaft rotation can be guided into the steam seal chamber 5 through the guide teeth, and the kinetic energy of the steam that rushes into the chamber due to inertia is consumed by the small teeth in the chamber, so that the steam is fully dissipated in the steam seal chamber to achieve a sealing and steam-blocking effect. The angle design of the diverter steam guide tooth allows more steam to enter the steam seal chamber 5. Due to the slope design of the diverter steam guide tooth and the fact that it is only set at the entrance, the chamber of the entire steam seal ring 4 is still connected, making it easy for steam to enter but difficult to exit, and fully dissipated.

[0030] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A steam turbine steam seal device for enhancing steam guide seal, comprising a steam seal body (1), Features: A steam seal chamber (5) is provided on the radial inner side of the steam seal body, and a flow-dividing steam guide tooth (2) is arranged in the steam seal chamber (5) through the engagement of a small tooth in the chamber; The split steam guide tooth (2) is designed according to the form of the steam seal chamber and fits with the small tooth in the steam seal chamber to prevent the split steam guide tooth (2) from falling out, and a limit pin is provided between the split steam guide tooth (2) and the steam seal body (1) to prevent the guide tooth from moving due to steam pressure.

2. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: The split steam guide tooth (2) and the steam seal arc segment (6) are made of the same material and have the same length as each other and are integrally manufactured.

3. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: A groove (3) which fits with a small tooth in the steam seal chamber (5) is provided at the bottom connection of the diverter steam guide tooth (2).

4. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: The split steam guide teeth (2) are in the same segmented form as the steam seal ring (4) and are respectively embedded in each steam seal arc segment (6) of the steam seal ring (4).

5. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: The split steam guide tooth (2) has a slope surface with a certain angle to the rotation direction of the rotor; The slope angle from the tip to the root of the split steam guide tooth (2) is between 30° and 45°.

6. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: After the steam seal chamber (5) is machined, the groove (3) provided at the bottom connection of the diverter steam guide tooth (2) slides into the chamber along the inner wall of the chamber, and the two ends are aligned with the steam seal arc segment (6).

7. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: After the flow-dividing steam guide teeth (2) are installed flat, through holes are provided at axial plane positions at both ends of the steam seal body (1), and the through holes penetrate each chamber and the flow-dividing steam guide teeth (2) in the chamber; A pin made of the same material as the steam seal body (1) and fitting into the through hole is passed through the through hole to fix the flow distribution steam guide tooth (2) in each chamber, and is fixed by riveting points at the axial plane positions at both ends of the steam seal body (1).

8. A steam turbine steam seal device with enhanced steam guide seal according to claim 1, Features: The flow-dividing steam-guiding tooth (2) is provided with a plurality of small flow-guiding teeth (7) according to the length of the steam seal arc segment (6); The groove at the entrance of the steam seal chamber (5) is separated and the interior of the chamber is connected.

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