Steam seal device for steam turbine

Abstract

The utility model discloses a steam seal device for a steam turbine, which relates to the technical field of steam seal of steam turbines and comprises a ring body, a holding ring is fixedly connected to the bottom of the ring body, a left flange plate and a right flange plate are respectively arranged on two sides of the ring body, and the steam seal device is divided into four independent parts including the ring body, the left flange plate, the right flange plate and the holding ring. Each part is respectively cast or formed by cutting a steel plate, and then the independent parts are welded together, so that the processing period is effectively shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine steam seals, in particular to a steam turbine steam seal device. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants. In the design and use of steam turbine units, shaft end steam seal leakage has always been the focus of research by engineering and technical personnel. In order to reduce the steam leakage loss at the shaft end seal of the steam turbine, improve the operating state of the unit, and improve the economy, safety and reliability of the unit, a steam seal device is installed at the shaft end of the steam turbine.

[0003] The steam seal device is an important part of the condensing steam turbine. It is usually located at the front and rear ends of the steam turbine and cooperates with the rotor to play a sealing role, which can prevent steam from leaking out of the cylinder and prevent air from entering the cylinder. Figure 1 As shown, usually, the steam seal device is installed in the annular grooves at both ends of the cylinder. Due to the reduction of the inner diameter at both ends of the cylinder and the small size of the steam seal body, the existing technology generally relies on casting.

[0004] However, when a condensing steam turbine is converted into a back-pressure steam turbine, Figure 2 As shown, it is necessary to dismantle multiple pressure stages including the last pressure stage partition and the next last pressure stage partition of the steam turbine, which requires redesigning a new steam seal device and installing the steam seal device into the annular groove originally used to install the pressure stage partition. However, due to the location factor, the outer diameter of the new steam seal device becomes larger, and integral casting is adopted, which prolongs the processing cycle. Utility Model Content

[0005] In order to overcome the defect in the prior art that the outer diameter of the steam seal device becomes larger, resulting in a longer casting cycle, the utility model provides a steam seal device for a steam turbine.

[0006] The utility model solves the technical problem by adopting a technical solution: a steam seal device for a steam turbine comprises a ring body, a holding ring is fixedly connected to the bottom of the ring body, and a left flange plate and a right flange plate are respectively arranged on both sides of the ring body.

[0007] As a further improvement of the utility model, the ring body and the holding ring are welded.

[0008] As a further improvement of the utility model, the left flange plate and the right flange plate are respectively welded to the two sides of the ring body.

[0009] As a further improvement of the utility model, comb teeth are provided at the bottom of the holding ring.

[0010] As a further improvement of the utility model, the comb teeth include a plurality of T-shaped grooves arranged at the bottom of the holding ring, and steam sealing blocks are embedded in the T-shaped grooves.

[0011] As a further improvement of the utility model, a sealing ring is provided on the holding ring.

[0012] Compared with the prior art, the utility model has the beneficial effects: in this solution, the steam seal device is divided into four independent parts: the ring body, the left flange plate, the right flange plate and the holding ring. Each part is cast separately or cut into shape with steel plates, and then these independent parts are welded together, which effectively shortens the processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 This is a schematic diagram of the installation structure of the steam seal device of an existing steam turbine.

[0015] Figure 2 Schematic diagram of the steam seal structure of a back-pressure steam turbine.

[0016] Figure 3 The utility model is a schematic diagram of the installation structure of a steam seal device for a steam turbine.

[0017] In the figure: 1. Cylinder; 2. Steam seal body; 3. Rotor; 4. Final pressure stage partition; 5. Next final pressure stage partition; 6. Steam seal device; 7. Ring body; 8. Left flange plate; 9. Right flange plate; 10. Holding ring; 11. Sealing ring. DETAILED DESCRIPTION

[0018] In order to make the technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0019] Reference Figure 2 and Figure 3 The utility model embodiment discloses a steam seal device for a steam turbine, comprising a ring body 7, a holding ring 10 is fixedly connected to the bottom of the ring body 7, and a left flange plate 8 and a right flange plate 9 are respectively provided on both sides of the ring body 7. The ring body 7 and the holding ring 10 are welded. The left flange plate 8 and the right flange plate 9 are respectively welded to the two sides of the ring body 7. A sealing ring 11 is provided on the holding ring 10, and the sealing ring 11 prevents excessive steam leakage and improves sealing performance.

[0020] This structure divides the steam seal device into a ring body 7, a left flange plate 8, a right flange plate 9 and a holding ring 10. Each part is relatively independent and each part is cast or cut from a steel plate. These independent parts are then welded together, effectively shortening the processing cycle.

[0021] The bottom of the holding ring 10 is provided with comb teeth, and the comb teeth include a plurality of T-shaped grooves arranged at the bottom of the holding ring 10, and steam sealing blocks are embedded in the T-shaped grooves.

[0022] It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A steam seal device for a steam turbine, characterized in that: The invention comprises a ring body (7), a holding ring (10) being fixedly connected to the bottom of the ring body (7), a left flange plate (8) and a right flange plate (9) being respectively provided on both sides of the ring body (7), a combing tooth being provided at the bottom of the holding ring (10), the combing tooth comprising a plurality of T-shaped grooves arranged at the bottom of the holding ring (10), a steam sealing block being embedded in the T-shaped groove, and a sealing ring (11) being provided on the holding ring (10).

2. A steam seal device for a steam turbine according to claim 1, characterized in that: The ring body (7) and the holding ring (10) are welded.

3. A steam seal device for a steam turbine according to claim 2, characterized in that: The left flange plate (8) and the right flange plate (9) are respectively welded to the two sides of the ring body (7).

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