Anti-rotation device for valve butterfly of quick-closing valve of steam turbine

Abstract

The utility model discloses a steam turbine quick-closing valve butterfly anti-rotation device which comprises a quick-closing valve seat, a valve seat cavity is formed in the quick-closing valve seat, one end of the quick-closing valve seat is a trumpet-shaped opening, the other end of the quick-closing valve seat is closed, and a steam inlet hole is formed in the side face close to the other end of the quick-closing valve seat; the valve butterfly assembly comprises a valve rod arranged in the axial direction of the quick-closing valve seat, a pre-opening valve gland and a quick-closing valve butterfly, the pre-opening valve gland is fixed to the axis of the quick-closing valve butterfly through threads, and the pre-opening valve gland is provided with a vertical part and a horizontal part; the anti-rotation handle is fixedly connected with the pre-opening valve gland, so that the valve disc of the quick-closing valve can be disassembled and overhauled in the later period conveniently; the installation height of the anti-rotation plate is lower than the edge of the lower portion of the valve butterfly of the quick-closing valve, and therefore normal action of the quick-closing valve and opening and closing of the valve butterfly are not hindered. The handle rod of the anti-rotation handle is inserted into the anti-rotation plate, and the anti-rotation handle is in ball contact with the groove of the anti-rotation plate, so that normal action of the quick-closing valve and opening and closing of the valve butterfly are not hindered.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine fast-closing valves, and in particular relates to a valve butterfly anti-rotation device for a steam turbine fast-closing valve. Background Art

[0002] Steam turbine is a rotary steam power device, commonly used in power plants, and also widely used in chemical, petroleum, metallurgy, natural gas and other industrial fields. Steam turbine quick-closing valve is also called quick-closing main steam valve. When the steam turbine is shut down normally or in an emergency, the quick-closing valve can be quickly closed to cut off the steam inlet of the steam turbine to achieve the purpose of shutdown.

[0003] At present, the valve stem of some steam turbine quick-closing valves directly penetrates the quick-closing valve pre-starting valve gland and is fixed inside the valve butterfly by threads. There is no radial blocking or limiting mechanism of the valve butterfly to prevent the valve butterfly from rotating freely around the valve stem. The valve stem and valve butterfly installation mechanism mainly has the following shortcomings:

[0004] During turbine operation, the fast closing valve is in the open state. High-velocity steam enters the valve seat chamber of the fast closing valve and impacts the valve butterfly. The valve butterfly will rotate around the valve stem axis under the impact force. The continuous rotation of the valve butterfly will cause metal fatigue wear at the contact between the pre-start valve cover and the valve stem. Wear of the contact between the valve butterfly pre-start valve cover and the valve stem will cause the pre-start valve stroke of the fast closing valve to increase, causing internal leakage of the valve. Replacing the worn pre-start valve cover and gate stem will cause economic losses. At the same time, if the fast closing valve leaks during turbine operation, it will affect the reliability of the normal and emergency shutdown of the turbine, and cause hidden dangers to the safe operation of the turbine.

[0005] To this end, the utility model proposes a steam turbine quick-closing valve butterfly anti-rotation device. Utility Model Content

[0006] The utility model aims to provide a turbine fast closing valve butterfly anti-rotation device to solve the problem in the above background technology that high-velocity steam may impact the butterfly valve and bring potential safety hazards to subsequent operation.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine quick-closing valve butterfly anti-rotation device, the device includes a quick-closing valve seat, a valve seat chamber is formed inside, one end of which is a trumpet-shaped opening, the other end is closed, and a steam inlet hole is opened on the side adjacent to the other end; a valve butterfly assembly, including a valve stem, a pre-start valve gland, and a quick-closing valve butterfly arranged along the axial direction of the quick-closing valve seat, wherein the pre-start valve gland is fixed to the axis of the quick-closing valve butterfly by threads, and the pre-start valve gland has a vertical portion and a horizontal portion; one end of the valve stem passes through the outside of the quick-closing valve seat, and the other end is arranged in a stepped shaft shape, that is, the diameter of the other end is larger than the diameter of one end of the valve stem, and the other end of the valve stem is movably arranged on the inner side of the horizontal portion of the pre-start valve gland, and is clamped on the pre-start valve gland. The vertical part of the pre-start valve cover is located at the vertical part of the pre-start valve cover, and the other end of the valve stem is in abutment with the butterfly of the quick-closing valve; it also includes a limit assembly, which is composed of a connecting member and a supporting member, wherein the top of the connecting member is threadedly connected to the vertical part of the pre-start valve cover, and allows the valve stem to move through along the axial direction of the valve seat of the quick-closing valve, so as to limit the valve stem and prevent the valve butterfly from rotating around the axial direction of the valve stem. In order to further prevent the rotation of the butterfly of the quick-closing valve, the bottom of the connecting member extends to the interior of the supporting member and moves in the axial direction of the valve seat of the quick-closing valve in the supporting member to ensure that it can move; the supporting member is installed on the inner bottom end surface of the valve seat chamber, and a tightening portion is provided in the supporting member, which rolls against the bottom side of the connecting member.

[0008] Preferably, the connecting member is an anti-rotation handle, which consists of a handle rod and a hexagonal hole opened on the top of the handle rod, wherein the hexagonal hole is connected through the valve stem, and the inner side surfaces of the two hexagonal holes are on the tangent line of the valve stem end face, thereby achieving locking of the valve stem in the rotation direction to prevent rotation, and the bottom of the handle rod slides and extends into the carrier.

[0009] Preferably, the abutting portion includes a connecting block and a perforated cover plate sleeved on the end of the connecting block, a ball is placed between the perforated cover plate and the connecting block, the ball passes through the perforated cover plate and is rollingly connected to the bottom side wall of the handle rod, an adjusting screw extending into the wall groove passes through the outer middle position of the anti-rotation plate, and the adjusting screw rotates against the connecting block.

[0010] Preferably, a connecting groove is provided in the middle of the rear surface of the connecting block, an arc-shaped limit block is fixed at the top of the connecting groove, an annular groove is provided at the end of the adjusting screw, and the limit block is inserted into the annular groove at the end of the adjusting screw; guide columns are also fixed at both ends of the connecting block, and the inner wall of the wall groove is reserved with a hole for the guide column to be movably inserted.

[0011] Preferably, a protrusion is formed on the downward inner wall of the wall groove, and slots for the protrusion to slide into are provided on the upper and lower surfaces of the connecting block, thereby limiting the connecting block and preventing the connecting block from being completely ejected by the adjusting screw.

[0012] Preferably, a stepped shaft-shaped through hole is provided at the axis of the butterfly of the quick-closing valve, and the middle portion of the through hole is in a constricted shape, and the other end of the valve stem is sealed with the constricted portion.

[0013] Preferably, a steam inlet is provided on the outer surface of one end of the valve seat of the quick-closing valve, and the horizontal projection of the steam inlet is on the valve stem, so it is not shown in the figure. One end of the valve stem is connected to an external power device, such as an oil motor.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The anti-rotation handle is connected and fixed to the pre-start valve gland, which is convenient for the later disassembly and maintenance of the quick-closing valve butterfly;

[0016] 3. The installation height of the anti-rotation plate is lower than the lower edge of the quick-closing valve butterfly, so as not to hinder the normal operation of the quick-closing valve and the opening and closing of the valve butterfly;

[0017] 3. The anti-rotation handle is inserted into the anti-rotation plate, and the anti-rotation handle and the groove of the anti-rotation plate are rolled and fitted, so as not to hinder the normal operation of the quick-closing valve and the opening and closing of the valve butterfly;

[0018] 4. The length of the anti-rotation plate is greater than the valve stroke to prevent the anti-rotation handle from moving out of the anti-rotation plate when the quick-closing valve butterfly moves;

[0019] 5. When steam enters the impact valve butterfly from the quick-closing valve seat and rotates, the anti-rotation handle fixed to the valve butterfly will be blocked by the anti-rotation plate, thereby preventing the quick-closing valve butterfly from rotating. This prevents the valve stem and the pre-starting valve gland from wearing out, causing the quick-closing valve stroke to increase and internal leakage to affect the safety of turbine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of the utility model quick-closing valve in a closed state;

[0021] Figure 2 This is a structural schematic diagram of the utility model quick-closing valve in an open state;

[0022] Figure 3 This is a front view of the connection between the anti-rotation handle and the anti-rotation plate of the utility model;

[0023] Figure 4 For this utility model Figure 3 A magnified schematic diagram of the middle A area;

[0024] Figure 5It is a rear view of the connecting block of the utility model.

[0025] In the figure:

[0026] 1. Anti-rotation handle; 11. Hexagonal hole; 12. Handle rod;

[0027] 2. Anti-rotation plate; 21. Moving groove; 22. Connecting block; 23. Ball bearing; 24. Card slot; 25. Wall slot; 26. Adjusting screw; 27. Connecting groove; 28. Cover plate with holes; 29. ​​Limiting block; 210. Guide column;

[0028] 3. Valve stem; 4. Pre-start valve gland; 5. Quick-closing valve butterfly; 6. Quick-closing valve seat; 7. Valve seat chamber. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figures 1 to 5 The utility model provides a technical solution: a steam turbine fast closing valve butterfly anti-rotation device, the device comprises

[0031] The quick-closing valve seat 6 has a valve seat chamber 7 formed therein, one end of which is a trumpet-shaped opening and the other end is closed, and a steam inlet hole is provided on the side adjacent to the other end;

[0032] The valve butterfly assembly comprises a valve stem 3, a pre-start valve gland 4 and a quick-closing valve butterfly 5 which are axially arranged along a quick-closing valve seat 6, wherein the pre-start valve gland 4 is fixed at the axis of the quick-closing valve butterfly 5 by means of threads, and the pre-start valve gland 4 has a vertical portion and a horizontal portion; one end of the valve stem 3 penetrates the outside of the quick-closing valve seat 6, and the other end is arranged in a stepped shaft shape, that is, the diameter of the other end is larger than the diameter of one end of the valve stem 3, the other end of the valve stem 3 is movably arranged inside the horizontal portion of the pre-start valve gland 4, and is clamped at the vertical portion of the pre-start valve gland 4, and the other end of the valve stem 3 is movably abutted against the quick-closing valve butterfly 5;

[0033] It also includes a limit assembly, which is composed of a connecting member and a bearing member.

[0034] The top of the connector is threadedly connected to the vertical part of the pre-start valve gland 4, and the valve stem 3 is allowed to move through the valve seat 6 along the axial direction of the quick-closing valve, so as to limit the valve butterfly 5 and prevent the quick-closing valve butterfly 5 from rotating. The bottom of the connector extends to the inside of the bearing component and moves in the axial direction of the quick-closing valve seat 6 in the bearing component to ensure that it can move;

[0035] The bearing member is mounted on the inner bottom end surface of the valve seat chamber 7. A pressing portion is arranged inside the bearing member, and the pressing portion rolls against the bottom side of the connecting member.

[0036] In this embodiment, preferably, the connecting member is an anti-rotation handle 1, which is composed of a handle rod 12 and a hexagonal hole 11 opened on the top of the handle rod 12, wherein the hexagonal hole 11 is connected with the valve stem 3 through, and the inner side surfaces of the hexagonal holes 11 of both are on the tangent line of the end surface of the valve stem 3, thereby achieving the locking of the valve butterfly 5 in the rotation direction to prevent rotation, and the bottom of the handle rod 12 slides and extends into the carrier.

[0037] In this embodiment, preferably, the supporting member is an anti-rotation plate 2, and a movable groove 21 for the handle rod 12 to slide into is provided on the top surface of the anti-rotation plate 2, and a wall groove 25 is provided on the inner wall of the movable groove 21. The tightening part is arranged in the wall groove 25, and the tightening part rolls against the two sides of the bottom of the handle rod 12.

[0038] In this embodiment, preferably, the tightening portion includes a connecting block 22, and a perforated cover plate 28 that is mounted on the end of the connecting block 22 by welding or bonding. A ball 23 is placed between the perforated cover plate 28 and the connecting block 22. The ball 23 passes through the perforated cover plate 28 and is rollingly connected to the bottom side wall of the handle rod 12, thereby realizing a rolling connection. Under the premise of limiting the position, it is also possible to avoid excessive friction that affects the movement. An adjusting screw 26 extending into the wall groove 25 passes through the outer middle position of the anti-rotation plate 2. The adjusting screw 26 rotates against the connecting block 22, and the position of the connecting block 22 is adjusted by rotating the adjusting screw 26, thereby further realizing the connection between the ball 23 and the handle rod 12.

[0039] Preferably, a connecting groove 27 is opened in the middle of the rear surface of the connecting block 22, and an arc-shaped limit block 29 is fixed at the top of the connecting groove 27. An annular groove is opened at the end of the adjusting screw 26. When the adjusting screw 26 rotates, it will rotate in the connecting groove 27 and will push the connecting block 22 out horizontally without causing movement obstacles. The limit block 29 is inserted into the annular groove at the end of the adjusting screw 26 to achieve connection limitation; guide columns 210 are also fixed at both ends of the connecting block 22 to improve the connection stability between the connecting block 22 and the anti-rotation plate 2, and the inner wall of the wall groove 25 is reserved with a hole for the guide column 210 to be movably inserted.

[0040] In the present embodiment, preferably, a stepped shaft-shaped through hole is opened at the axis center of the quick-closing valve butterfly 5, and the middle part of the through hole is in a constricted shape, and the other end of the valve stem 3 is sealed with the constricted part. This state is a closed state, and when it needs to be opened, one end of the valve stem 3 is moved toward the outside direction of the quick-closing valve seat 6. At this time, the other end of the valve stem 3 will be separated from the through hole and clamped with the vertical part of the pre-start valve pressure cover 4, and the pre-start valve pressure cover 4 will be driven to synchronously move the anti-rotation handle 1 and the quick-closing valve butterfly 5 away from one end of the quick-closing valve seat 6. At this time, the quick-closing valve seat 6 is in an open state, and during the period from the separation of the other end of the valve stem 3 from the through hole to the clamping of the vertical part of the pre-start valve pressure cover 4, the gas from one end of the quick-closing valve seat 6 to the quick-closing valve butterfly 5 will be depressurized toward the other end of the quick-closing valve seat 6 to ensure that the normal opening is not affected.

[0041] In this embodiment, preferably, a steam inlet is provided on the outer surface of one end of the quick-closing valve seat 6, and the horizontal projection of the steam inlet is on the valve stem 3, so it is not shown in the figure. One end of the valve stem 3 is connected to an external power device, such as a cylinder.

[0042] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine quick-closing valve butterfly anti-rotation device, the device comprising The quick-closing valve seat (6) has a valve seat chamber (7) formed therein, one end of which is a trumpet-shaped opening and the other end is closed, and a steam inlet hole is provided on the side adjacent to the other end; A valve butterfly assembly comprises a valve stem (3), a pre-start valve gland (4), and a quick-closing valve butterfly (5) arranged axially along a quick-closing valve seat (6), wherein the pre-start valve gland (4) is fixed at the axis of the quick-closing valve butterfly (5) by means of threads, and the pre-start valve gland (4) has a vertical portion and a horizontal portion; one end of the valve stem (3) penetrates the outside of the quick-closing valve seat (6), and the other end is arranged in a stepped shaft shape, the other end of the valve stem (3) is movably arranged inside the horizontal portion of the pre-start valve gland (4), and is clamped at the vertical portion of the pre-start valve gland (4), and the other end of the valve stem (3) is movably abutted against the quick-closing valve butterfly (5); the characteristics are: It also includes a limit assembly, which is composed of a connecting member and a bearing member. The top of the connecting member is threadedly connected to the vertical portion of the pre-start valve gland (4) and allows the valve stem (3) to move through the quick-closing valve seat (6) axially, while the bottom of the connecting member extends to the interior of the bearing member and moves in the axial direction of the quick-closing valve seat (6) within the bearing member; The bearing member is mounted on the inner bottom end surface of the valve seat chamber (7), and a tightening portion is arranged inside the bearing member, and the tightening portion rolls against the bottom side of the connecting member.

2. The anti-rotation device for the valve butterfly of a steam turbine fast closing valve according to claim 1, characterized in that: The connecting member is an anti-rotation handle (1), which is composed of a handle rod (12) and a hexagonal hole (11) opened on the top of the handle rod (12), wherein the hexagonal hole (11) is connected to the valve stem (3) through and through, and the inner side surfaces of the two hexagonal holes (11) are located on the tangent line of the end surface of the valve stem (3), and the bottom of the handle rod (12) slides and extends into the bearing member.

3. The anti-rotation device for the valve butterfly of a steam turbine fast closing valve according to claim 2, characterized in that: The bearing member is an anti-rotation plate (2), and a movable groove (21) for the handle rod (12) to slide and insert is provided on the top surface of the anti-rotation plate (2), and a wall groove (25) is provided on the inner wall of the movable groove (21), and the abutment portion is arranged in the wall groove (25), and the abutment portion rolls against both sides of the bottom of the handle rod (12).

4. The anti-rotation device for the valve butterfly of a steam turbine fast closing valve according to claim 3 is characterized in that: The abutting portion comprises a connecting block (22) and a perforated cover plate (28) sleeved on the end of the connecting block (22); a ball (23) is placed between the perforated cover plate (28) and the connecting block (22); the ball (23) passes through the perforated cover plate (28) and is rollingly connected to the bottom side wall of the handle rod (12); an adjusting screw (26) extending into the wall groove (25) passes through the middle position of the outer portion of the anti-rotation plate (2); the adjusting screw (26) and the connecting block (22) are rotatably abutted.

5. The anti-rotation device for the valve butterfly of a steam turbine fast closing valve according to claim 4, characterized in that: A connecting groove (27) is provided in the middle of the rear surface of the connecting block (22), an arc-shaped limit block (29) is fixed on the top of the connecting groove (27), an annular groove is provided at the end of the adjusting screw (26), and the limit block (29) is inserted into the annular groove at the end of the adjusting screw (26); guide posts (210) are also fixed at both ends of the connecting block (22), and a hole for movably inserting the guide post (210) is reserved on the inner wall of the wall groove (25).

6. The anti-rotation device for the valve butterfly of a steam turbine fast closing valve according to claim 1, characterized in that: A stepped shaft-shaped through hole is provided at the axis of the quick-closing valve butterfly (5), and the middle of the through hole is in a constricted shape, while the other end of the valve stem (3) is sealed with the constricted portion.

7. The steam turbine quick closing valve butterfly anti-rotation device according to claim 1, characterized in that: A steam inlet is provided on the outer surface of one end of the quick-closing valve seat (6), and the horizontal projection of the steam inlet is located on the valve stem (3). One end of the valve stem (3) is connected to an external power device.

Images