A steam inlet structure for a 3.2MW steam turbine

Abstract

A 3.2MW steam turbine steam inlet structure, which relates to the technical field of steam turbines. The present invention is to solve the problem that the existing lift valve steam inlet structure has poor control accuracy and cannot be maintained online. The present invention includes a main steam valve, two regulating valves, two nozzles and three actuators. The main steam valve, the regulating valve and the nozzle are all fixedly connected to the upper half of the cylinder. The steam inlet end of the main steam valve is connected to the steam inlet flange of the steam turbine. The two regulating valves are arranged in parallel on the rear side of the main steam valve. The steam inlet end of the regulating valve is respectively connected to the exhaust end of the main steam valve. A buffer chamber is provided between the exhaust end of the main steam valve and the steam inlet end of the regulating valve. The exhaust end of one regulating valve is connected to the first nozzle chamber, and the exhaust end of the other regulating valve is connected to the second nozzle chamber. The first nozzle chamber and the second nozzle chamber are both connected with nozzles. The main steam valve and the two regulating valves are respectively connected to an actuator. The present invention is used for steam inlet of steam turbines.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a steam inlet structure of a 3.2MW steam turbine. Background Art

[0002] At present, 3.2MW steam turbines are rarely used in the market. Steam turbines of the same power level mostly use a flap valve structure, which has a simple structure and poor control accuracy. Since multiple valves share one actuator, the actuator can only be shut down for maintenance when it fails. The flap valve steam inlet structure cannot meet the controllability and maintainability requirements of the 3.2MW test project. Summary of the invention

[0003] In order to solve the problem that the existing lift valve steam inlet structure has poor control accuracy and cannot be maintained online, the present invention further proposes a 3.2MW steam turbine steam inlet structure.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A 3.2MW steam turbine steam inlet structure comprises a main steam valve, two regulating valves, two nozzles and three actuators. The main steam valve, the regulating valves and the nozzles are all fixedly connected to the upper half of the cylinder. The steam inlet end of the main steam valve is connected to the steam inlet flange of the steam turbine. The two regulating valves are arranged in parallel on the rear side of the main steam valve. The steam inlet ends of the regulating valves are respectively connected to the exhaust ends of the main steam valve. A buffer chamber is arranged between the exhaust end of the main steam valve and the steam inlet end of the regulating valve. The exhaust end of one of the regulating valves is connected to a first nozzle chamber, and the exhaust end of the other regulating valve is connected to a second nozzle chamber. Nozzles are connected to the first nozzle chamber and the second nozzle chamber. The main steam valve and the two regulating valves are respectively connected to an actuator.

[0006] Furthermore, the main steam valve is an inverted structure, the exhaust end of the main steam valve is arranged at the upper part, and the buffer chamber is arranged at the upper part of the main steam valve.

[0007] Further, the main steam valve comprises a main steam valve housing, a main steam valve stem, a main steam valve seat, a main steam valve disc, a main steam valve disc nut, a main steam valve sealing sleeve, a main steam valve valve filter, a main steam valve disc sleeve, a main steam valve cover, a main steam valve sealing packing and a main steam valve compression sleeve;

[0008] The main steam valve housing is fixedly connected to the housing of the upper half of the cylinder, and the main steam valve cover is fixedly connected to the lower end of the main steam valve housing. The main steam valve stem is vertically inserted on the main steam valve cover. The main steam valve sealing sleeve, main steam valve sealing packing and main steam valve clamping sleeve are arranged in sequence from top to bottom between the main steam valve stem and the main steam valve cover. The upper end surface of the main steam valve clamping sleeve cooperates with the lower end of the main steam valve sealing packing. The upper end of the main steam valve stem is arranged in the main steam valve housing, and the lower end of the main steam valve stem extends downward to the outside of the main steam valve housing and is connected to the actuator. The main steam valve seat is fixedly connected to the main steam valve housing. At the root of the exhaust end inside the main steam valve housing, a main steam valve disc is arranged between the top of the main steam valve stem and the lower end of the main steam valve seat, the outer circumferential side wall of the top of the main steam valve disc matches the inner circumferential side wall of the lower end of the main steam valve seat, the outer side of the upper end of the main steam valve stem is sleeved with a main steam valve disc nut, the upper end of the main steam valve disc nut is threadedly connected with the lower end of the main steam valve disc, the outer side of the main steam valve disc nut is sleeved with a main steam valve disc sleeve and a main steam valve filter from the inside to the outside, the main steam valve disc sleeve and the main steam valve filter are fixedly connected in the main steam valve housing.

[0009] Furthermore, a main steam valve sliding sleeve is provided on the inner side of the main steam valve disc nut, the inner side wall of the main steam valve sliding sleeve is slidably connected to the outer side wall of the main steam valve stem, the outer side wall of the main steam valve disc nut is slidably connected to the inner side wall of the main steam valve disc sleeve, and a main steam valve limiting flange is fixedly connected to the outer circumferential side wall at the top end of the main steam valve stem, and the main steam valve limiting flange is arranged at the upper end of the main steam valve sliding sleeve.

[0010] Furthermore, the main steam valve disc sleeve is fixedly connected to the main steam valve cover, and the main steam valve filter is fixedly connected between the main steam valve housing and the main steam valve cover.

[0011] Furthermore, a main steam valve exhaust hole is provided in the middle of the main steam valve seat, an inner arc surface is provided on the inner circumferential side wall of the lower end of the main steam valve exhaust hole, and an outer arc surface is provided on the outer circumferential side wall of the upper end of the main steam valve disc, and the inner arc surface matches the outer arc surface.

[0012] Furthermore, the regulating valve is of an upright structure, the exhaust end of the regulating valve is arranged at the lower part, and the first nozzle chamber and the second nozzle chamber are respectively arranged at the lower part of the corresponding regulating valve.

[0013] Further, the regulating valve comprises a regulating valve housing, a regulating valve stem, a regulating valve pressing sleeve, a regulating valve sealing packing, a regulating valve cover, a regulating valve sealing sleeve, a regulating valve disc sleeve, a regulating valve disc nut, a regulating valve disc and a regulating valve seat;

[0014] The regulating valve housing is fixedly connected to the housing of the upper half of the cylinder, a regulating valve cover is fixedly connected to the upper end of the regulating valve housing, a regulating valve stem is vertically inserted into the regulating valve cover, a regulating valve sealing sleeve, a regulating valve sealing packing and a regulating valve pressing sleeve are arranged in sequence from bottom to top between the regulating valve stem and the regulating valve cover, the lower end surface of the regulating valve pressing sleeve cooperates with the upper end of the regulating valve sealing packing, the lower end of the regulating valve stem is arranged in the regulating valve housing, the upper end of the regulating valve stem extends upward to the outside of the regulating valve housing, and is connected to the regulating valve The actuator is connected, and the regulating valve seat is fixedly connected to the root of the exhaust end inside the regulating valve housing. A regulating valve disc is arranged between the lower end of the regulating valve stem and the upper end of the regulating valve seat. The outer circumferential side wall of the lower end of the regulating valve disc matches the inner circumferential side wall of the upper end of the regulating valve seat. A regulating valve disc nut is mounted on the outer side of the lower end of the regulating valve stem. The regulating valve disc nut is threadedly connected to the regulating valve disc. A regulating valve disc sleeve is mounted on the outer side of the regulating valve disc nut. The regulating valve disc sleeve is fixedly connected to the regulating valve housing.

[0015] Furthermore, a regulating valve sliding sleeve is provided on the inner side of the regulating valve disc nut, the inner side wall of the regulating valve sliding sleeve is slidably connected to the outer side wall of the regulating valve stem, the outer side wall of the regulating valve disc nut is slidably connected to the inner side wall of the regulating valve disc sleeve, and a regulating valve limiting flange is fixedly connected to the outer circumferential side wall of the lower end of the regulating valve stem, and the regulating valve limiting flange is arranged at the lower end of the regulating valve sliding sleeve.

[0016] Furthermore, a regulating valve exhaust hole is provided in the middle of the regulating valve seat, an inner inverted conical surface is provided on the inner circumferential side wall of the upper end of the regulating valve exhaust hole, and an outer inverted conical surface is provided on the outer circumferential side wall of the lower end of the regulating valve disc, and the inner inverted conical surface matches the outer inverted conical surface.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The valve stem of the present invention adopts a packing sealing method, which does not cause valve stem steam leakage and reduces leakage losses.

[0019] 2. The present invention comprises two sets of regulating valves, which can realize the sequential valve control of the unit, that is, by controlling the different openings of the two valves, the operation of the operating valve with a large opening and low pressure loss can be realized.

[0020] 3. The two groups of regulating valves of the present invention are independently controlled. When one of the valves fails, the unit can be operated at half load and the failure can be repaired online. The improved maintainability of the unit can effectively reduce the failure downtime rate.

[0021] 4. The present invention controls the main steam valve and the regulating valve through the actuator, and the control accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the overall structure of the present invention;

[0023] Figure 2 A left side view of the overall structure of the present invention;

[0024] Figure 3 is an axial cross-sectional view of the overall structure of the present invention;

[0025] Figure 4 is a transverse cross-sectional view of the overall structure of the present invention;

[0026] Figure 5 is a cross-sectional view of the main steam valve 3 in the present invention;

[0027] Figure 6 It is a cross-sectional view of the regulating valve 4 in the present invention. DETAILED DESCRIPTION

[0028] Specific implementation method 1: Combination Figures 1 to 6 The present embodiment is described. The present embodiment describes a 3.2MW steam turbine steam inlet structure comprising a main steam valve 3, two regulating valves 4, two nozzles 9 and three actuators 5. The main steam valve 3, the regulating valves 4 and the nozzles 9 are all fixedly connected to the upper half 2 of the cylinder. The steam inlet end of the main steam valve 3 is connected to the steam inlet flange 1 of the steam turbine. The two regulating valves 4 are arranged in parallel on the rear side of the main steam valve 3. The steam inlet ends of the regulating valves 4 are respectively connected to the exhaust ends of the main steam valve 3. A buffer chamber 6 is provided between the exhaust end of the main steam valve 3 and the steam inlet end of the regulating valves 4. The exhaust end of one of the regulating valves 4 is connected to the first nozzle chamber 7, and the exhaust end of the other regulating valve 4 is connected to the second nozzle chamber 8. Nozzles 9 are connected to the first nozzle chamber 7 and the second nozzle chamber 8. The main steam valve 3 and the two regulating valves 4 are each connected to an actuator 5.

[0029] The main steam valve 3 and the regulating valve 4 are both zero-leakage sealing structures. The two regulating valves 4 are arranged asymmetrically and are arranged to the right side of the unit (along the flow direction). The regulating valve housing is cast separately and welded to the upper half of the cylinder 2. The main steam valve housing is cast separately and welded to the left side of the regulating valve housing.

[0030] The main steam pipe is connected to the turbine steam inlet flange 1 through a flange. After the steam enters the main steam valve 3, it enters the buffer chamber 6 from bottom to top, and after buffering, it enters the regulating valve 4. The steam passes through the regulating valve 4 from top to bottom and enters the first nozzle chamber 7 and the second nozzle chamber 8. After flowing through the nozzle 9, it enters the flow to do work.

[0031] The actuator 5 is a hydraulically controlled actuator, such as a hydraulic cylinder.

[0032] Specific implementation method 2: Combination Figures 1 to 6 To explain this embodiment, the main steam valve 3 in this embodiment is an inverted structure, the exhaust end of the main steam valve 3 is arranged at the upper part, and the buffer chamber 6 is arranged at the upper part of the main steam valve 3. Other components and connection methods are the same as those in the first embodiment.

[0033] Specific implementation method three: Combination Figures 1 to 6 To explain this embodiment, the main steam valve 3 described in this embodiment includes a main steam valve housing, a main steam valve stem 10, a main steam valve seat 11, a main steam valve disc 12, a main steam valve disc nut 13, a main steam valve sealing sleeve 14, a main steam valve valve filter 15, a main steam valve disc sleeve 16, a main steam valve cover 17, a main steam valve sealing packing 18 and a main steam valve pressing sleeve 19;

[0034] The main steam valve housing is fixedly connected to the shell of the upper half 2 of the cylinder, and the main steam valve cover 17 is fixedly connected to the lower end of the main steam valve housing. The main steam valve stem 10 is vertically inserted on the main steam valve cover 17. The main steam valve sealing sleeve 14, the main steam valve sealing packing 18 and the main steam valve clamping sleeve 19 are arranged in sequence from top to bottom between the main steam valve stem 10 and the main steam valve cover 17. The upper end surface of the main steam valve clamping sleeve 19 cooperates with the lower end of the main steam valve sealing packing 18. The upper end of the main steam valve stem 10 is arranged in the main steam valve housing, and the lower end of the main steam valve stem 10 extends downward to the outside of the main steam valve housing and is connected to the actuator 5. The main steam valve seat 11 is fixedly connected to the main steam valve housing. At the root of the exhaust end inside the main steam valve housing, a main steam valve disc 12 is provided between the top of the main steam valve stem 10 and the lower end of the main steam valve seat 11. The outer circumferential side wall of the top of the main steam valve disc 12 matches the inner circumferential side wall of the lower end of the main steam valve seat 11. The outer side of the upper end of the main steam valve stem 10 is covered with a main steam valve disc nut 13. The upper end of the main steam valve disc nut 13 is threadedly connected to the lower end of the main steam valve disc 12. The outer side of the main steam valve disc nut 13 is covered with a main steam valve disc sleeve 16 and a main steam valve filter 15 in sequence from the inside to the outside. The main steam valve disc sleeve 16 and the main steam valve filter 15 are fixedly connected in the main steam valve housing. Other components and connection methods are the same as those of the second specific implementation method.

[0035] In this embodiment, the actuator 5 pulls the main steam valve stem 10, and the main steam valve stem 10 is linked to the main steam valve disc 12, and the main steam valve disc 12 leaves the main steam valve seat 11, and the main steam valve 3 opens the steam turbine to start steam intake, otherwise the main steam valve closes the steam turbine to stop steam intake. The main steam valve disc sleeve 16 is used to ensure that the main steam valve disc 12 is aligned with the main steam valve seat 11, and the main steam valve cover 17 is used to isolate the air. The main steam valve sealing sleeve 14 and the main steam valve sealing packing 18 are used to seal the main steam valve stem 10 in contact with the air, and the main steam valve compression sleeve 19 compresses the main steam valve sealing packing 18 to play a sealing role.

[0036] The main steam valve sealing filler 18 is a sealing filler made of graphite composite material.

[0037] The main steam valve disc nut 13 is fixedly connected to the main steam valve disc 12 via a positioning pin.

[0038] Specific implementation method four: Combination Figures 1 to 6 To explain this embodiment, a main steam valve sliding sleeve 13-1 is provided inside the main steam valve disc nut 13 of this embodiment, the inner side wall of the main steam valve sliding sleeve 13-1 is slidably connected to the outer side wall of the main steam valve stem 10, the outer side wall of the main steam valve disc nut 13 is slidably connected to the inner side wall of the main steam valve disc sleeve 16, a main steam valve limiting flange 10-1 is fixedly connected to the outer circumferential side wall at the top end of the main steam valve stem 10, and the main steam valve limiting flange 10-1 is arranged at the upper end of the main steam valve sliding sleeve 13-1. Other components and connection methods are the same as those of the specific embodiment three.

[0039] Specific implementation method five: Combination Figures 1 to 6 To explain this embodiment, the main steam valve disc sleeve 16 of this embodiment is fixedly connected to the main steam valve cover 17, and the main steam valve filter 15 is fixedly connected between the main steam valve housing and the main steam valve cover 17. Other components and connection methods are the same as those of the third embodiment.

[0040] Specific implementation method six: Combination Figures 1 to 6 To illustrate this embodiment, a main steam valve exhaust hole 11-1 is provided in the middle of the main steam valve seat 11 described in this embodiment, an inner arc surface is provided on the inner circumferential side wall of the lower end of the main steam valve exhaust hole 11-1, and an outer arc surface is provided on the outer circumferential side wall of the upper end of the main steam valve disc 12, and the inner arc surface matches the outer arc surface.

[0041] Other components and connection methods are the same as those of the third specific implementation method.

[0042] When the main steam valve 3 is opened, the actuator 5 pulls the main steam valve stem 10 downward, the main steam valve stem 10 moves downward, the main steam valve limit flange 10-1 pulls the main steam valve disc nut 13 downward, the main steam valve disc nut 13 drives the main steam valve disc 12 to move downward, and a gap is generated between the outer arc surface at the upper end of the main steam valve disc 12 and the inner arc surface at the lower end of the main steam valve exhaust hole 11-1. Steam enters through the main steam valve steam inlet end, is filtered by the main steam valve valve filter 15, and is discharged from the main steam valve exhaust end through the gap.

[0043] When the main steam valve 3 is closed, the actuator 5 pushes the main steam valve stem 10 upward, the main steam valve stem 10 moves upward, the top end of the main steam valve stem 10 pushes the main steam valve disc 12 upward, the main steam valve disc 12 drives the main steam valve disc nut 13 to move upward, and the outer arc surface at the upper end of the main steam valve disc 12 and the inner arc surface at the lower end of the main steam valve exhaust hole 11-1 are closed.

[0044] A plurality of guide blocks 29 are evenly inserted and installed on the main steam valve disc sleeve 16 along the circumferential direction, and the inner end of each guide block 29 cooperates with the outer side wall of the main steam valve disc nut 13 to guide the main steam valve disc nut 13.

[0045] The lower end of the main steam valve disc sleeve 16 is provided with a main steam valve disc sleeve through hole, the main steam valve disc nut 13 is provided with a main steam valve disc nut through hole, the top of the main steam valve disc 12 is provided with a main steam valve disc through hole, and the top of the main steam valve stem 10 cooperates with the lower end of the main steam valve disc through hole. This design connects the inside and outside of the main steam valve disc sleeve 16, the inside and outside of the main steam valve disc nut 13, and the inside and outside of the main steam valve disc 12, so that the internal pressure of the main steam valve 3 is balanced when opening and closing, ensuring that the main steam valve 3 can be switched smoothly.

[0046] When the main steam valve 3 is opened, a gap is generated between the top of the main steam valve stem 10 and the lower end of the main steam valve disc through hole. When the main steam valve 3 is closed, the top of the main steam valve stem 10 and the lower end of the main steam valve disc through hole are closed.

[0047] Specific implementation method seven: Combination Figures 1 to 6 To explain this embodiment, the regulating valve 4 in this embodiment is a positive structure, the exhaust end of the regulating valve 4 is arranged at the lower part, and the first nozzle chamber 7 and the second nozzle chamber 8 are respectively arranged at the lower part of the corresponding regulating valve 4. Other components and connection methods are the same as those of the first embodiment.

[0048] Specific implementation method eight: Combination Figures 1 to 6 The present embodiment is described. The regulating valve 4 in the present embodiment comprises a regulating valve housing, a regulating valve stem 20, a regulating valve clamping sleeve 21, a regulating valve sealing packing 22, a regulating valve cover 23, a regulating valve sealing sleeve 24, a regulating valve disc sleeve 25, a regulating valve disc nut 26, a regulating valve disc 27 and a regulating valve seat 28.

[0049] The regulating valve housing is fixedly connected to the shell of the upper half 2 of the cylinder, and a regulating valve cover 23 is fixedly connected to the upper end of the regulating valve housing. The regulating valve stem 20 is vertically inserted into the regulating valve cover 23. A regulating valve sealing sleeve 24, a regulating valve sealing packing 22 and a regulating valve pressing sleeve 21 are arranged in sequence from bottom to top between the regulating valve stem 20 and the regulating valve cover 23. The lower end surface of the regulating valve pressing sleeve 21 cooperates with the upper end of the regulating valve sealing packing 22. The lower end of the regulating valve stem 20 is arranged in the regulating valve housing, and the upper end of the regulating valve stem 20 extends upward to the outside of the regulating valve housing and is in contact with the execution The regulating valve seat 28 is fixedly connected to the root of the exhaust end inside the regulating valve housing, and a regulating valve disc 27 is arranged between the lower end of the regulating valve stem 20 and the upper end of the regulating valve seat 28. The outer circumferential side wall of the lower end of the regulating valve disc 27 matches the inner circumferential side wall of the upper end of the regulating valve seat 28. The outer side of the lower end of the regulating valve stem 20 is provided with a regulating valve disc nut 26, which is threadedly connected to the regulating valve disc 27. The outer side of the regulating valve disc nut 26 is provided with a regulating valve disc sleeve 25, which is fixedly connected to the regulating valve housing. Other components and connection methods are the same as those of the specific embodiment seven.

[0050] The regulating valve disc sleeve 25 is fixedly connected to the regulating valve cover 23 .

[0051] The actuator 5 controls the regulating valve stem 20 to link the regulating valve disc 27 to different positions with the regulating valve seat 28, that is, to achieve control of different steam inlet amounts of the steam turbine. The regulating valve disc sleeve 25 is used to ensure that the regulating valve disc 27 is aligned with the regulating valve seat 28, and the regulating valve cover 23 is used to isolate the air. The regulating valve sealing sleeve 24 and the regulating valve sealing packing 22 jointly seal the regulating valve stem 20 in contact with the air, and the regulating valve pressing sleeve 21 compresses the regulating valve sealing packing 22 to play a sealing role.

[0052] The regulating valve sealing filler 22 is a sealing filler made of a graphite composite material.

[0053] The regulating valve disc nut 26 and the regulating valve disc 27 are fixedly connected via a positioning pin.

[0054] Specific implementation method nine: Combination Figures 1 to 6 To explain this embodiment, a regulating valve sliding sleeve 26-1 is provided inside the regulating valve disc nut 26 of this embodiment, the inner side wall of the regulating valve sliding sleeve 26-1 is slidably connected to the outer side wall of the regulating valve stem 20, the outer side wall of the regulating valve disc nut 26 is slidably connected to the inner side wall of the regulating valve disc sleeve 25, and a regulating valve limiting flange 20-1 is fixedly connected to the outer circumferential side wall of the lower end of the regulating valve stem 20, and the regulating valve limiting flange 20-1 is arranged at the lower end of the regulating valve sliding sleeve 26-1. Other components and connection methods are the same as those of the specific embodiment eight.

[0055] Specific implementation method ten: Combination Figures 1 to 6 To explain this embodiment, the middle part of the regulating valve seat 28 of this embodiment is provided with a regulating valve exhaust hole 28-1, the inner circumferential side wall of the upper end of the regulating valve exhaust hole 28-1 is provided with an inner inverted conical surface, and the outer circumferential side wall of the lower end of the regulating valve disc 27 is provided with an outer inverted conical surface, and the inner inverted conical surface matches the outer inverted conical surface. Other components and connection methods are the same as those of the specific embodiment eight.

[0056] When the regulating valve 4 is opened, the actuator 5 pulls the regulating valve stem 20 upward, the regulating valve stem 20 moves upward, the regulating valve limit flange 20-1 pulls the regulating valve disc nut 26 upward, the regulating valve disc nut 26 drives the regulating valve disc 27 to move upward, and a gap is generated between the outer inverted cone surface at the lower end of the regulating valve disc 27 and the inner inverted cone surface at the upper end of the regulating valve exhaust hole 28-1, and steam enters through the steam inlet end of the regulating valve and is discharged from the steam exhaust end of the regulating valve through the gap.

[0057] When the regulating valve 4 is closed, the actuator 5 pushes the regulating valve stem 20 downward, the regulating valve stem 20 moves downward, the lower end of the regulating valve stem 20 pushes the regulating valve disc 27 downward, the regulating valve disc 27 drives the regulating valve disc nut 26 to move downward, and the outer inverted cone surface at the lower end of the regulating valve disc 27 and the inner inverted cone surface at the upper end of the regulating valve exhaust hole 28-1 are closed.

[0058] The regulating valve disc nut 26 is provided with a regulating valve disc nut through hole, the lower end of the regulating valve disc 27 is provided with a regulating valve disc through hole, the lower end of the regulating valve stem 20 cooperates with the upper end of the regulating valve disc through hole, such a design connects the inner and outer sides of the regulating valve disc nut 26, and the inner and outer sides of the regulating valve disc 27, so that the internal pressure of the regulating valve 4 is kept balanced when opening and closing, ensuring that the regulating valve 4 can be switched smoothly.

[0059] When the regulating valve 4 is opened, a gap is generated between the lower end of the regulating valve stem 20 and the upper end of the regulating valve disc through hole. When the regulating valve 4 is closed, the lower end of the regulating valve stem 20 and the upper end of the regulating valve disc through hole are closed.

[0060] The main steam valve housing, the regulating valve housing and the upper half 2 of the cylinder are all cast structures and are welded together after casting.

[0061] 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.

[0062] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 3.2MW steam turbine steam inlet structure, characterized in that: It comprises a main steam valve (3), two regulating valves (4), two nozzles (9) and three actuators (5). The main steam valve (3), the regulating valves (4) and the nozzles (9) are all fixedly connected to the upper half of the cylinder (2). The steam inlet end of the main steam valve (3) is connected to the steam inlet flange (1) of the steam turbine. The two regulating valves (4) are arranged in parallel on the rear side of the main steam valve (3). The steam inlet ends of the regulating valves (4) are respectively connected to the steam exhaust ends of the main steam valve (3). A buffer chamber (6) is arranged between the steam exhaust ends of the main steam valve (3) and the steam inlet ends of the regulating valves (4). The steam exhaust end of one regulating valve (4) is connected to a first nozzle chamber (7), and the steam exhaust end of the other regulating valve (4) is connected to a second nozzle chamber (8). The first nozzle chamber (7) and the second nozzle chamber (8) are both connected to nozzles (9). The main steam valve (3) and the two regulating valves (4) are respectively connected to an actuator (5). The main steam valve (3) is an inverted structure, the exhaust end of the main steam valve (3) is arranged at the upper part, and the buffer chamber (6) is arranged at the upper part of the main steam valve (3); The main steam valve (3) comprises a main steam valve housing, a main steam valve stem (10), a main steam valve seat (11), a main steam valve disc (12), a main steam valve disc nut (13), a main steam valve sealing sleeve (14), a main steam valve valve filter (15), a main steam valve disc sleeve (16), a main steam valve cover (17), a main steam valve sealing packing (18) and a main steam valve pressing sleeve (19); The main steam valve housing is fixedly connected to the housing of the upper half (2) of the cylinder. The lower end of the main steam valve housing is fixedly connected to a main steam valve cover (17). The main steam valve stem (10) is vertically inserted into the main steam valve cover (17). A main steam valve sealing sleeve (14), a main steam valve sealing packing (18) and a main steam valve pressing sleeve (19) are sequentially arranged between the main steam valve stem (10) and the main steam valve cover (17) from top to bottom. The upper end surface of the main steam valve pressing sleeve (19) is matched with the lower end of the main steam valve sealing packing (18). The upper end of the main steam valve stem (10) is arranged in the main steam valve housing. The lower end of the main steam valve stem (10) extends downward to the outside of the main steam valve housing and is connected to the actuator (5). The main steam valve seat (11) is fixedly connected to the main steam valve housing. A main steam valve disc (12) is connected to the root of the exhaust end inside the main steam valve housing, and is provided between the top end of the main steam valve stem (10) and the lower end of the main steam valve seat (11). The outer circumferential side wall of the top end of the main steam valve disc (12) matches the inner circumferential side wall of the lower end of the main steam valve seat (11). A main steam valve disc nut (13) is sleeved on the outer side of the upper end of the main steam valve stem (10). The upper end of the main steam valve disc nut (13) is threadedly connected to the lower end of the main steam valve disc (12). A main steam valve disc sleeve (16) and a main steam valve filter screen (15) are sequentially sleeved on the outer side of the main steam valve disc nut (13) from the inside to the outside. The main steam valve disc sleeve (16) and the main steam valve filter screen (15) are fixedly connected in the main steam valve housing; The regulating valve (4) is of an upright structure, the exhaust end of the regulating valve (4) is arranged at the lower part, and the first nozzle chamber (7) and the second nozzle chamber (8) are respectively arranged at the lower part of the corresponding regulating valve (4).

2. A 3.2MW steam turbine steam inlet structure according to claim 1, characterized in that: A main steam valve sliding sleeve (13-1) is provided on the inner side of the main steam valve disc nut (13); the inner side wall of the main steam valve sliding sleeve (13-1) is slidably connected to the outer side wall of the main steam valve stem (10); the outer side wall of the main steam valve disc nut (13) is slidably connected to the inner side wall of the main steam valve disc sleeve (16); a main steam valve limiting flange (10-1) is fixedly connected to the outer circumferential side wall of the top end of the main steam valve stem (10); and the main steam valve limiting flange (10-1) is arranged at the upper end of the main steam valve sliding sleeve (13-1).

3. A 3.2MW steam turbine steam inlet structure according to claim 1, characterized in that: The main steam valve disc sleeve (16) is fixedly connected to the main steam valve cover (17), and the main steam valve filter (15) is fixedly connected between the main steam valve housing and the main steam valve cover (17).

4. A 3.2MW steam turbine steam inlet structure according to claim 1, characterized in that: A main steam valve exhaust hole (11-1) is provided in the middle of the main steam valve seat (11), an inner arc surface is provided on the inner circumferential side wall at the lower end of the main steam valve exhaust hole (11-1), and an outer arc surface is provided on the outer circumferential side wall at the upper end of the main steam valve disc (12), and the inner arc surface matches the outer arc surface.

5. The 3.2MW steam turbine steam inlet structure according to claim 1, characterized in that: The regulating valve (4) comprises a regulating valve housing, a regulating valve stem (20), a regulating valve clamping sleeve (21), a regulating valve sealing packing (22), a regulating valve cover (23), a regulating valve sealing sleeve (24), a regulating valve disc sleeve (25), a regulating valve disc nut (26), a regulating valve disc (27) and a regulating valve seat (28); The regulating valve housing is fixedly connected to the housing of the upper half (2) of the cylinder. The upper end of the regulating valve housing is fixedly connected to a regulating valve cover (23). The regulating valve stem (20) is vertically inserted into the regulating valve cover (23). A regulating valve sealing sleeve (24), a regulating valve sealing packing (22) and a regulating valve pressing sleeve (21) are sequentially arranged between the regulating valve stem (20) and the regulating valve cover (23) from bottom to top. The lower end surface of the regulating valve pressing sleeve (21) cooperates with the upper end of the regulating valve sealing packing (22). The lower end of the regulating valve stem (20) is arranged in the regulating valve housing. The upper end of the regulating valve stem (20) extends upward to the outside of the regulating valve housing and is in contact with the actuator. The regulating valve seat (28) is fixedly connected to the root of the exhaust end inside the regulating valve housing, a regulating valve disc (27) is provided between the lower end of the regulating valve stem (20) and the upper end of the regulating valve seat (28), the outer circumferential side wall of the lower end of the regulating valve disc (27) matches the inner circumferential side wall of the upper end of the regulating valve seat (28), a regulating valve disc nut (26) is sleeved on the outer side of the lower end of the regulating valve stem (20), the regulating valve disc nut (26) is threadedly connected to the regulating valve disc (27), a regulating valve disc sleeve (25) is sleeved on the outer side of the regulating valve disc nut (26), and the regulating valve disc sleeve (25) is fixedly connected to the regulating valve housing.

6. A 3.2MW steam turbine steam inlet structure according to claim 5, characterized in that: A regulating valve sliding sleeve (26-1) is provided on the inner side of the regulating valve disc nut (26); the inner side wall of the regulating valve sliding sleeve (26-1) is slidably connected to the outer side wall of the regulating valve stem (20); the outer side wall of the regulating valve disc nut (26) is slidably connected to the inner side wall of the regulating valve disc sleeve (25); a regulating valve limiting flange (20-1) is fixedly connected to the outer circumferential side wall of the lower end of the regulating valve stem (20); and the regulating valve limiting flange (20-1) is arranged at the lower end of the regulating valve sliding sleeve (26-1).

7. A 3.2MW steam turbine steam inlet structure according to claim 5, characterized in that: A regulating valve exhaust hole (28-1) is provided in the middle of the regulating valve seat (28); an inner inverted conical surface is provided on the inner circumferential side wall of the upper end of the regulating valve exhaust hole (28-1); an outer inverted conical surface is provided on the outer circumferential side wall of the lower end of the regulating valve disc (27); the inner inverted conical surface matches the outer inverted conical surface.

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