Valve structure of high-pressure inner cylinder of steam turbine

Abstract

The utility model relates to the technical field of steam turbines, in particular to a steam turbine high-pressure inner cylinder valve structure which comprises a valve body, a connecting pipe, a fastening pipe and a bolt, a fixing block is fixedly connected to the top end of the valve body, a fixing frame is fixedly connected to the top end of the fixing block, and an air cylinder is fixedly connected to the inner side of the top end of the fixing frame. According to the valve plate device, through the arrangement of the sliding groove, the connecting rod, the valve plates, the polyphenylene sulfide plastic plate and the fixing block, under the condition that the function of the adjusting valve is not changed, a group of valve plate devices can be additionally arranged in the valve body, when the group of valve plates are damaged, the valve plates can be conveniently replaced, and the valve plate device is convenient to use. The other group of valve plates can still work normally, high-temperature and high-pressure steam can be adjusted normally, and high-temperature-resistant and high-pressure-resistant polyphenylene sulfide plastic plates are arranged on the two sides of the valve plates, so that the valve plates can be protected to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a high-pressure inner cylinder valve structure of a steam turbine. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and is then sprayed onto the blades, causing the rotor equipped with the blade rows to rotate and perform work externally. 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. Steam turbines have two valves, a main steam valve and a regulating valve. The main function of the main steam valve is to protect the shutdown, and the main function of the regulating valve is to adjust the amount of steam entering the steam turbine, which requires strictness and good linearity.

[0003] The regulating valve is located on the main steam pipeline between the high-pressure main steam valve and the steam turbine. Its function is to control the air intake in the high-pressure inner cylinder of the steam turbine by changing the valve opening. Before the steam turbine is loaded, different openings of the regulating valve correspond to different speeds. Since the steam in the main steam pipeline is high-temperature and high-pressure gas, the regulating valve has only one valve plate. After long-term use, the valve plate is easily damaged and it is troublesome to replace. Secondly, the installation and disassembly between the regulating valve and the main steam pipeline are troublesome, and many other components need to be disassembled. Therefore, a steam turbine high-pressure inner cylinder valve structure is proposed to address the above problems. Utility Model Content

[0004] The utility model aims to provide a high-pressure inner cylinder valve structure of a steam turbine to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-pressure inner cylinder valve structure for a steam turbine comprises a valve body, a connecting pipe, a fastening pipe and bolts, wherein a fixing block is fixedly connected to the top of the valve body, a fixing frame is fixedly connected to the top of the fixing block, a cylinder is fixedly connected to the inner side of the top of the fixing frame, a connecting frame is fixedly connected to the bottom end of the cylinder, a connecting rod is provided on the outer side of the bottom end of the connecting frame, a valve plate is fixedly connected to the bottom end of the connecting rod, a sliding groove is provided inside the valve body, polyphenylene sulfide plastic plates are fixedly connected to both sides of the valve plate, fixing pipes are fixedly connected to both ends of the valve body, a semicircular fixing ring is fixedly connected to the inside of the fixing pipe, a sealing gasket is fixedly connected to one side of the fixing ring, a connecting plate is fixedly connected to the outside of the fixing pipe, an annular groove is provided on the outside of the connecting pipe, a rubber block is fixedly connected to one end of the connecting pipe, and bolts pass through the inside of the connecting plate.

[0007] Preferably, the number of the connecting rod, the valve plate and the slide groove is two each, and one connecting rod, one valve plate and one slide groove form a group.

[0008] Preferably, the width of the fixing ring is smaller than the width of the annular groove, and the fixing ring is in contact with the inner wall of the annular groove.

[0009] Preferably, the distance between the two fixing rings is equal to the distance between the two annular grooves on the outer side of the connecting pipe.

[0010] Preferably, the inner diameter of the fastening tube is equal to the inner diameter of the fixing tube.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. In the utility model, by providing the slide groove, connecting rod, valve plate, polyphenylene sulfide plastic plate and fixing block, a set of valve plate devices can be added to the valve body without changing the function of the regulating valve. When one set of valve plates is damaged, the remaining set of valve plates can still work normally and regulate the high-temperature and high-pressure steam normally. The high-temperature and high-pressure resistant polyphenylene sulfide plastic plates are provided on both sides of the valve plate, which can protect the valve plate to a certain extent.

[0013] 2. In the utility model, by providing the fixing pipe, fixing ring, sealing gasket, connecting plate, connecting pipe, annular groove, rubber block and fastening pipe, convenient disassembly and installation between the regulating valve and the main steam pipeline can be achieved without disassembling many other parts. In addition, the provision of the fixing ring, sealing gasket and annular groove can increase the sealing of the connection, prevent high-temperature and high-pressure steam from leaking from the connection, causing the steam pressure in the high-pressure inner cylinder of the turbine to fail to meet the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 For this utility model Figure 1 A schematic diagram of the structure at A;

[0016] Figure 3 This is a schematic diagram of the installation of the valve plate structure of the utility model;

[0017] Figure 4 For this utility model Figure 3 Schematic diagram of the structure at B;

[0018] Figure 5 This is a schematic diagram of the structure of the fixed pipe and the fastening pipe of the utility model;

[0019] Figure 6 This is a schematic diagram of the installation of the connecting pipe structure of the utility model.

[0020] In the figure: 1. valve body; 2. fixing block; 3. fixing frame; 4. cylinder; 5. connecting frame; 6. connecting rod; 7. valve plate; 8. slide groove; 9. polyphenylene sulfide plastic plate; 10. fixing pipe; 11. fixing ring; 12. sealing gasket; 13. connecting plate; 14. connecting pipe; 15. annular groove; 16. rubber block; 17. fastening pipe; 18. bolt. DETAILED DESCRIPTION

[0021] 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.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0024] See also Figure 1-6 , the utility model provides a technical solution:

[0025] A high-pressure inner cylinder valve structure for a steam turbine comprises a valve body 1, a connecting pipe 14, a fastening pipe 17 and a bolt 18, wherein a fixing block 2 is fixedly connected to the top of the valve body 1, a fixing frame 3 is fixedly connected to the top of the fixing block 2, a cylinder 4 is fixedly connected to the inner side of the top of the fixing frame 3, a connecting frame 5 is fixedly connected to the bottom end of the cylinder 4, a connecting rod 6 is provided on the outer side of the bottom end of the connecting frame 5, a valve plate 7 is fixedly connected to the bottom end of the connecting rod 6, a slide groove 8 is provided inside the valve body 1, polyphenylene sulfide plastic plates 9 are fixedly connected to both sides of the valve plate 7, fixing pipes 10 are fixedly connected to both ends of the valve body 1, a semicircular annular fixing ring 11 is fixedly connected to the inside of the fixing pipe 10, a sealing gasket 12 is fixedly connected to one side of the fixing ring 11, a connecting plate 13 is fixedly connected to the outside of the fixing pipe 10, an annular groove 15 is provided on the outside of the connecting pipe 14, a rubber block 16 is fixedly connected to one end of the connecting pipe 14, and a bolt 18 passes through the inside of the connecting plate 13.

[0026] There are two connecting rods 6, two valve plates 7 and two slide grooves 8, and one connecting rod 6, one valve plate 7 and one slide groove 8 form a group; the width of the fixing ring 11 is smaller than the width of the annular groove 15, and the fixing ring 11 is attached to the inner wall of the annular groove 15; the distance between the two fixing rings 11 is equal to the distance between the two annular grooves 15 on the outside of the connecting pipe 14; the inner diameter of the fastening pipe 17 is equal to the inner diameter of the fixing pipe 10.

[0027] Working process: When the device is used, the external air pump provides air pressure support to the cylinder 4. The device is installed between the steam turbine and the high-pressure main steam valve to adjust the amount of steam entering the high-pressure inner cylinder of the steam turbine. There is a fixed block 2 on the outside of the valve body 1, and the fixing frame 3 is fixed to the top of the fixing block 2. The cylinder 4 is located on the inner side of the top of the fixing frame 3, and the opening and closing of the valve plate 7 can be controlled. There is a connecting frame 5 at the bottom end of the cylinder 4, and the connecting frame 5 is connected to the connecting rod 6 at the top of the valve plate 7. Polyphenylene sulfide plastic plates 9 are provided on both sides of the valve plate 7. The valve plate 7 and The polyphenylene sulfide plastic plate 9 forms a control structure and slides in the slide groove 8. The two ends of the valve body 1 are fixed with fixed tubes 10, and a fixed ring 11 is provided inside the fixed tube 10. A sealing gasket 12 with a sealing function is provided on the inner side of the fixed ring 11. An annular groove 15 is provided on the outer side of the connecting tube 14. A rubber block 16 with a sealing function is provided at one end of the connecting tube 14. When installing the regulating valve, the regulating valve is placed between the two connecting tubes 14, and the connecting tube 14 is installed in the fixed tube 10. The fixing ring 11 is stuck in the annular groove 15, and the sealing gasket 12 is provided on the inner side of the fixing ring 11. The connecting tube 14 is located between the fixing ring 11 and the annular groove 15 to seal the connection. The rubber block 16 at one end of the connecting tube 14 abuts against the outside of the valve body 1 to seal between the connecting tube 14 and the valve body 1. After the connecting tube 14 is installed inside the fixing tube 10, the fastening tube 17 is clamped on the other side of the connecting tube 14. The bolt 18 passes through the connecting plate 13. By tightening the bolt 18, the fixing tube 10 and the fastening tube 17 can tightly fix the connecting tube 14 on the outside of the valve body 1. Under the action of the sealing gasket 12, the rubber block 16, etc., it can Increase the sealing of the connection to prevent high-temperature and high-pressure steam from leaking from the connection, resulting in insufficient steam entering the high-pressure inner cylinder of the steam turbine and low rotor speed. When the amount of steam entering the high-pressure inner cylinder of the steam turbine needs to be adjusted, decide whether to increase or decrease the amount of steam entering the high-pressure inner cylinder of the steam turbine according to the rotor speed. Drive the valve plate 7 up and down in the slide groove 8 by the cylinder 4 to control the opening and closing degree of the valve plate 7, thereby controlling the amount of steam entering the steam turbine and controlling the steam pressure and steam amount in the high-pressure inner cylinder of the steam turbine.

[0028] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The standard parts used in this utility model can be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt the conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine high-pressure inner cylinder valve structure, comprising a valve body (1), a connecting pipe (14), a fastening pipe (17) and bolts (18), characterized in that: The top of the valve body (1) is fixedly connected to a fixing block (2), the top of the fixing block (2) is fixedly connected to a fixing frame (3), the top inner side of the fixing frame (3) is fixedly connected to a cylinder (4), the bottom of the cylinder (4) is fixedly connected to a connecting frame (5), the bottom outer side of the connecting frame (5) is provided with a connecting rod (6), the bottom end of the connecting rod (6) is fixedly connected to a valve plate (7), a sliding groove (8) is provided inside the valve body (1), both sides of the valve plate (7) are fixedly connected to polyphenylene sulfide plastic plates (9), both ends of the valve body (1) are fixedly connected to fixing pipes (10), the inside of the fixing pipe (10) is fixedly connected to a semicircular fixing ring (11), one side of the fixing ring (11) is fixedly connected to a sealing gasket (12), the outside of the fixing pipe (10) is fixedly connected to a connecting plate (13), the outside of the connecting pipe (14) is provided with an annular groove (15), one end of the connecting pipe (14) is fixedly connected to a rubber block (16), and a bolt (18) passes through the inside of the connecting plate (13).

2. A steam turbine high-pressure inner cylinder valve structure according to claim 1, characterized in that: The number of the connecting rod (6), the valve plate (7) and the slide groove (8) is two each, and one connecting rod (6), one valve plate (7) and one slide groove (8) form a group.

3. A steam turbine high-pressure inner cylinder valve structure according to claim 1, characterized in that: The width of the fixing ring (11) is smaller than the width of the annular groove (15), and the fixing ring (11) is tightly attached to the inner wall of the annular groove (15).

4. A steam turbine high-pressure inner cylinder valve structure according to claim 1, characterized in that: The distance between the two fixing rings (11) is equal to the distance between the two annular grooves (15) on the outside of the connecting pipe (14).

5. A steam turbine high-pressure inner cylinder valve structure according to claim 1, characterized in that: The inner diameter of the fastening tube (17) is equal to the inner diameter of the fixing tube (10).

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