Steam turbine cylinder with leakage stop ring

Abstract

The utility model provides a kind of steam turbine cylinder with leakproof ring, it includes: upper cylinder and lower cylinder, upper cylinder is composed of upper outer cylinder body and upper inner chamber, and upper outer cylinder body is equipped with two steam inlets passing through upper outer cylinder body and upper inner chamber;Lower cylinder is composed of lower outer cylinder body and lower inner chamber, and lower inner chamber cavity wall is equipped with steam buffer zone, and the cavity formed by upper inner chamber and lower inner chamber is respectively mounted with leakproof ring, rotor mounting seat and shaft seal ring.The application adopts detachable leakproof ring, rotor mounting seat and shaft seal ring, easy to maintain, shorten maintenance time;Leakproof ring adopts three-layer leakproof structure, with better wear resistance and high temperature resistance, can always maintain good sealing effect;The structure of shaft seal ring and rotor mounting seat, rotary effectively reduces steam leakage;Cavity inside is equipped with the steam buffer zone of surfacing high-temperature material, and the lower pressure balance area and the upper pressure balance area of rotary steam of spherical, effectively rotate the high-temperature steam in cavity, improve the thermal efficiency of steam turbine.

Description

Technical Field

[0001] This utility model relates to a steam turbine cylinder with a leak-proof ring, belonging to the field of steam turbine technology. Background Technology

[0002] The steam turbine cylinder is the core component of a steam turbine, responsible for converting the thermal energy of high-temperature, high-pressure steam into mechanical energy. It is typically divided into high-pressure, intermediate-pressure, and low-pressure cylinders (multi-cylinder series design). The materials used must withstand high temperatures and pressures (such as cast steel or alloy steel), and it includes the rotor, blades, diaphragms, etc. Steam drives the blades to rotate, which in turn drives the rotor to output power. Steam expands and performs work as it passes through cylinders of different pressure levels, with pressure and temperature decreasing progressively, converting thermal energy into kinetic energy. The high-pressure cylinder withstands the initial high temperature (up to 600°C or higher), while the low-pressure cylinder handles large flows of low-temperature steam.

[0003] During the operation of a steam turbine, the cylinder is a key component, and its performance directly affects the efficiency, reliability, and maintenance costs of the entire unit. Most existing steam turbine cylinders are one-piece fixed structures. The components inside the cylinder are prone to wear under long-term exposure to high-temperature, high-pressure steam. Once worn, the sealing gaps increase, leading to a significant increase in steam leakage. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, this utility model provides a steam turbine cylinder with a leak-proof ring.

[0005] This utility model solves the above-mentioned technical problems through the following technical solutions: This utility model provides a steam turbine cylinder with a leak-proof ring, comprising: The upper cylinder and the lower cylinder are fixedly connected by bolts. The upper cylinder consists of an upper outer cylinder body and an upper inner cavity. The upper outer cylinder body has two steam inlets that penetrate the upper outer cylinder body and the upper inner cavity. The lower cylinder consists of a lower outer cylinder body and a lower inner cavity. The lower cylinder matches the upper cylinder. The lower inner cavity wall corresponding to the steam inlets is provided with a steam buffer zone made of high-temperature material. The upper inner cavity and the lower inner cavity are correspondingly distributed and interconnected to form a cavity. A leak-proof ring, a rotor mounting seat and a shaft seal ring are respectively installed in the cavity formed by the upper inner cavity and the lower inner cavity.

[0006] In this technical solution, the leak-stop ring is a stepped collar structure, and the leak-stop ring has a sealing thread inside.

[0007] In this technical solution, the leak-stopping ring is provided with a first leak-stopping groove and a second leak-stopping groove.

[0008] In this technical solution, the leak-proof ring is embedded in the inner wall of the upper cylinder and the lower cylinder, and the leak-proof ring is sealed and fitted with the upper inner cavity and the lower inner cavity.

[0009] In this technical solution, the rotor mounting base is a semi-circular ring structure, and the annular surface of the rotor mounting base is provided with several stationary blades.

[0010] In this technical solution, the rotor mounting seat shaft center is provided with a rotor mounting groove.

[0011] In this technical solution, the rear ends of the upper inner cavity and the lower inner cavity are respectively provided with an upper pressure balance zone and a lower pressure balance zone with a reflux structure.

[0012] In this technical solution, both the upper pressure balance zone and the lower pressure balance zone are spherical groove structures.

[0013] In this technical solution, the shaft seal ring has a stepped groove inside, with the first shaft seal groove facing the cavity and the second shaft seal groove facing out of the cavity.

[0014] In this technical solution, the inner diameter of the first shaft seal groove is larger than the inner diameter of the second shaft seal groove, and the difference between the inner diameters of the first shaft seal groove and the second shaft seal groove is 10mm.

[0015] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0016] The positive and progressive effects of this utility model are as follows: The aforementioned steam turbine cylinder with a leak-proof ring employs a detachable leak-proof ring, rotor mounting base, and shaft seal ring, facilitating maintenance and shortening maintenance time. The leak-proof ring utilizes a three-layer leak-proof structure, exhibiting better wear resistance and high-temperature resistance, ensuring consistent sealing performance. The structure of the shaft seal ring and rotor mounting base effectively reduces steam leakage during rotation. The internal cavity features a steam buffer zone with welded high-temperature material, and spherical rotating steam lower and upper pressure balance zones, effectively rotating the high-temperature steam within the cavity and improving the turbine's thermal efficiency. 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 upper cylinder of this utility model.

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

[0020] Figure 4 This is a schematic diagram of the leak-stopping ring structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the rotor mounting base of this utility model.

[0022] Figure 6 This is a schematic diagram of the structure of the shaft seal ring of this utility model.

[0023] Explanation of reference numerals in the attached figures 1. Upper cylinder; 1-1. Steam inlet; 1-2. Upper pressure balance zone; 1-3. Upper outer cylinder body; 1-4. Upper inner cavity; 2. Lower cylinder; 2-1. Steam buffer zone; 2-2. Lower pressure balance zone; 2-3. Lower outer cylinder body; 2-4. Lower inner cavity; 3. Leak-stop ring; 3-1. Sealing thread; 3-2. First leak-stop groove; 3-3. Second leak-stop groove; 4. Rotor mounting base; 4-1. Stationary blade; 4-2. Rotor mounting groove; 5. Shaft seal ring; 5-1. First shaft seal groove; 5-2. Second shaft seal groove. Detailed Implementation

[0024] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0025] like Figure 1-6 As shown, the steam turbine cylinder with a leak-proof ring includes: The upper cylinder 1, lower cylinder 2, leak-proof ring 3, rotor mounting seat 4, and shaft seal ring 5 are assembled together by bolts. The upper cylinder 1 consists of an upper outer cylinder body 1-3 and an upper inner cavity 1-4, with two steam inlets 1-1 penetrating the upper outer cylinder body 1-3 and the upper inner cavity 1-4 at the upper end. The lower cylinder 2 consists of a lower outer cylinder body 2-3 and a lower inner cavity 2-4, which are matched with the upper cylinder 1. The lower inner cavity 2-4, corresponding to the steam inlet 1-1, has a steam buffer zone 2-1 made of high-temperature welded material on its cavity wall. The upper inner cavity 1-4 and the lower inner cavity 2-4 are closed together, and the leak-proof ring 3, rotor mounting seat 4, and shaft seal ring 5 are installed in a common slot. In this technical solution, the leak-stopping ring 3 is a stepped collar structure, which has a sealing thread 3-1, a first leak-stopping groove 3-2 and a second leak-stopping groove 3-3 inside, for a total of three layers of leak-stopping structure.

[0026] In this technical solution, the rotor mounting base 4 is a semi-circular ring structure, with several stationary blades 4-1 on its annular surface, making the temperature gradient of each level more gradual. The rotor mounting base 4 has a rotor mounting groove 4-2 at its shaft center, and the groove is oil-sealed.

[0027] In this technical solution, the shaft seal ring 5 has a stepped groove inside. The first shaft seal groove 5-1 faces the cavity, and the second shaft seal groove 5-2 faces outward. The inner diameter of the first shaft seal groove 5-1 is 10mm larger than that of the second shaft seal groove 5-2, which effectively prevents steam leakage.

[0028] In this technical solution, the upper inner cavity 1-4 and the lower inner cavity 2-4 are respectively provided with an upper pressure balance zone 1-2 and a lower pressure balance zone 2-2 with a reflux structure at their rear ends. These are spherical groove structures, and the steam inside the rotating cavity is refluxed.

[0029] This utility model adopts a detachable leak-proof ring 3, rotor mounting seat 4, and shaft seal ring 5, which facilitates maintenance and shortens maintenance time. The leak-proof ring 3 adopts a three-layer leak-proof structure, which has better wear resistance and high temperature resistance, and can always maintain a good sealing effect. The structure of shaft seal ring 5 and rotor mounting seat 4 effectively reduces steam leakage. The cavity is equipped with a steam buffer zone 2-1 with high-temperature material welded on, and a spherical rotating steam lower pressure balance zone 2-2 and upper pressure balance zone 1-2, which effectively rotate the high-temperature steam in the cavity and improve the thermal efficiency of the steam turbine.

[0030] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. A steam turbine cylinder with a leak-proof ring, characterized in that, include: An upper cylinder (1) and a lower cylinder (2) are fixedly connected by bolts. The upper cylinder (1) consists of an upper outer cylinder body (1-3) and an upper inner cavity (1-4). The upper outer cylinder body (1-3) has two steam inlets (1-1) at its upper end that penetrate the upper outer cylinder body (1-3) and the upper inner cavity (1-4). The lower cylinder (2) consists of a lower outer cylinder body (2-3) and a lower inner cavity (2-4). The lower cylinder (2) is matched with the upper cylinder (1). The lower inner cavity (2-4) corresponding to the steam inlet (1-1) is provided with a steam buffer (2-1) made of high temperature material. The upper inner cavity (1-4) and the lower inner cavity (2-4) are distributed and connected to each other to form a cavity. The upper inner cavity (1-4) and the lower inner cavity (2-4) are respectively equipped with a leak-proof ring (3), a rotor mounting seat (4) and a shaft seal ring (5).

2. The steam turbine cylinder with a leak-proof ring as described in claim 1, characterized in that: The leak-stop ring (3) is a stepped collar structure, and the leak-stop ring (3) has a sealing thread (3-1) inside.

3. The steam turbine cylinder with a leak-proof ring as described in claim 2, characterized in that: The leak-stop ring (3) is provided with a first leak-stop groove (3-2) and a second leak-stop groove (3-3) inside.

4. The steam turbine cylinder with a leak-proof ring as described in claim 2, characterized in that: The leak-proof ring (3) is embedded in the inner wall of the upper cylinder (1) and the lower cylinder (2), and the leak-proof ring (3) is sealed and fitted with the upper inner cavity (1-4) and the lower inner cavity (2-4).

5. The steam turbine cylinder with a leak-proof ring as described in claim 1, characterized in that: The rotor mounting base (4) is a semi-circular ring structure, and the ring surface of the rotor mounting base (4) is provided with several stationary blades (4-1).

6. The steam turbine cylinder with a leak-proof ring as described in claim 5, characterized in that: The rotor mounting base (4) has a rotor mounting groove (4-2) at the center of the shaft.

7. The steam turbine cylinder with a leak-proof ring as described in claim 1, characterized in that: The upper inner cavity (1-4) and the lower inner cavity (2-4) are respectively provided with an upper pressure balance zone (1-2) and a lower pressure balance zone (2-2) with a reflux structure at their rear ends.

8. The steam turbine cylinder with a leak-proof ring as described in claim 7, characterized in that: Both the upper pressure balance zone (1-2) and the lower pressure balance zone (2-2) are spherical groove structures.

9. The steam turbine cylinder with a leak-proof ring as described in claim 1, characterized in that: The shaft seal ring (5) has a stepped groove inside, with the first shaft seal groove (5-1) facing the cavity and the second shaft seal groove (5-2) facing the outside of the cavity.

10. The steam turbine cylinder with a leak-proof ring as described in claim 9, characterized in that: The inner diameter of the first shaft seal groove (5-1) is larger than the inner diameter of the second shaft seal groove (5-2), and the difference between the inner diameters of the first shaft seal groove (5-1) and the second shaft seal groove (5-2) is 10mm.

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