Turbine valve activity test device

Abstract

The utility model discloses a steam turbine valve activity test device, and relates to the technical field of steam turbine valve activity tests. The circulating pipe is communicated with the main throttle valve, and an electromagnetic valve and a servo valve are sequentially mounted on the circulating pipe; the throttling assembly is installed on the circulating pipe and used for controlling the oil return duration of the circulating pipe; the throttling assembly comprises two flow choking pipes, two flow choking pipes, two flow choking pipes and two flow choking pipes, the plugging assembly is rotationally mounted between the two flow blocking pipes; the first plugging plate is fixed in the plugging assembly; the second blocking plate is fixed in the flow blocking pipe; according to the utility model, the flow amount of the circulating pipe is adjusted through the cooperation of the first plugging plate and the second plugging plate, so that the main throttle valve can satisfy tests under different service powers, the backflow speed of the steam turbine throttle valve can be controlled, and the backflow time can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to turbine valve movable test technical field especially is related to a turbine valve movable test device. BACKGROUND

[0002] Whether turbine valve can be closed quickly and tightly under emergency situation is very important for safe operation of unit, and the valve must be ensured to be reliable and flexible during unit operation. Periodically carrying out valve movable test according to requirement is an important means to prevent valve from sticking during continuous operation of unit, to find out whether turbine valve has defects in time and to prevent turbine from serious overspeed accident. In order to ensure availability and reliability of turbine high / low pressure cylinder main valve and regulating valve, valve mobility test of turbine needs to be carried out periodically, and movable stroke range is 10%-20%.

[0003] The existing experimental device cannot timely adjust the backflow amount passing through the inside of the main valve, and cannot meet the test under different use powers. UTILITY MODEL CONTENTS

[0004] The utility model provides a turbine valve movable test device to solve the problem that the experimental device in prior art cannot timely adjust the backflow amount passing through the inside of the main valve, and cannot meet the test under different use powers.

[0005] The technical problem solved by the utility model is realized by the following technical scheme:

[0006] A turbine valve movable test device, comprising:

[0007] A main valve;

[0008] A circulating pipe, which is communicated with the main valve, and an electromagnetic valve and a servo valve are sequentially installed on the circulating pipe;

[0009] A throttling assembly, which is installed on the circulating pipe and is used for controlling the oil return time of the circulating pipe;

[0010] The throttling assembly comprises:

[0011] Two flow resistance pipes are arranged;

[0012] A plugging assembly, which is rotatably installed between the two flow resistance pipes;

[0013] A first plugging plate, which is fixed in the inside of the plugging assembly;

[0014] A second plugging plate, which is fixed in the inside of the flow resistance pipe and is in sealing contact with the first plugging plate;

[0015] A receiving shell assembly is fixed outside the choke pipe and wraps the blocking assembly;

[0016] A driving assembly is rotatably installed on the blocking assembly and extends outside the receiving shell assembly.

[0017] Optionally, a plurality of channels are arranged in a ring array and uniformly distributed on the first blocking plate and the second blocking plate.

[0018] Optionally, the blocking assembly comprises:

[0019] A receiving ring is fixed outside the first blocking plate;

[0020] An outer ring is fixed outside the receiving ring and extends outside the choke pipe;

[0021] A friction groove is arranged outside the outer ring.

[0022] Optionally, the blocking assembly further comprises:

[0023] A sealing ring is bonded to the inner surface of the outer ring and in contact with the choke pipe.

[0024] Optionally, the receiving shell assembly comprises:

[0025] A ring-shaped shell is sleeved outside the outer ring;

[0026] Two side plates are arranged and fixed outside the two choke pipes and are fixedly connected with the ring-shaped shell through bolts.

[0027] Optionally, the driving assembly comprises:

[0028] A friction wheel is inserted into the interior of the friction groove and in frictional contact with the inner wall of one side of the friction groove;

[0029] An extension rod is fixed on the friction wheel and passes through the ring-shaped shell;

[0030] A rotation key is fixed on the outer end of the extension rod.

[0031] Optionally, a scale disc is fixed on the outside of the ring-shaped shell, and a pointer corresponding to the scale disc is fixed on the outside of the rotation key.

[0032] The utility model has the beneficial effects that:

[0033] The flow amount of the circulating pipe is adjusted through the matched arrangement of the first blocking plate and the second blocking plate, so that the main steam valve can meet the test under different use powers, the backflow speed of the steam turbine valve can be controlled, and the backflow time is prolonged.

[0034] The backflow speed of the circulating pipe can be accurately controlled through the matched arrangement of the scale disc and the pointer, and the accuracy of the activity test is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical means, creative features, purposes and effects realized by the utility model, the following will further describe the utility model in combination with specific drawings.

[0036] Figure 1 It is a structural schematic diagram of the utility model;

[0037] Figure 2 It is an explosion schematic diagram of the throttling assembly structure of the utility model;

[0038] Figure 3 It is a blocking assembly structure schematic diagram of the utility model;

[0039] Figure 4 It is a throttling assembly structure schematic diagram of the utility model Figure 2 It is an enlarged schematic diagram of structure A in the utility model.

[0040] In the drawing: 100, main steam valve;

[0041] 200, circulating pipe;

[0042] 300, throttling assembly; 310, choke pipe; 320, blocking assembly; 321, receiving ring; 322, outer ring; 323, friction groove; 324, sealing ring; 330, first blocking plate; 340, second blocking plate; 350, receiving shell assembly; 351, annular shell; 352, side plate; 353, scale disc; 360, driving assembly; 361, friction wheel; 362, extension rod; 363, rotary key; 364, pointer; 370, channel. DETAILED DESCRIPTION

[0043] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the following will further describe the utility model in combination with specific drawings.

[0044] Referring to Figures 1-4 The utility model discloses a steam turbine valve activity test device, including:

[0045] Main steam valve 100;

[0046] A circulation pipe 200 is communicated with the main valve 100, and an electromagnetic valve and a servo valve are sequentially installed on the circulation pipe 200, and two ends of the circulation pipe 200 are communicated with upper and lower parts of the main valve 100;

[0047] A throttling assembly 300 is installed on the circulation pipe 200, and is used for controlling a time length of oil return of the circulation pipe 200;

[0048] The throttling assembly 300 comprises:

[0049] Two choke pipes 310 are arranged and connected with the circulation pipe 200;

[0050] A blocking assembly 320 is rotatably installed between the two choke pipes 310;

[0051] A first blocking plate 330 is fixed in the inside of the blocking assembly 320;

[0052] A second blocking plate 340 is fixed in the inside of the choke pipe 310, and is in sealing contact with the first blocking plate 330, and when the blocking assembly 320 rotates, the first blocking plate 330 is driven to rotate relative to the second blocking plate 340;

[0053] A receiving shell assembly 350 is fixed outside the choke pipe 310, and wraps the blocking assembly 320;

[0054] A driving assembly 360 is rotatably installed on the blocking assembly 320, and extends to the outside of the receiving shell assembly 350.

[0055] When the return flow speed of the circulation pipe 200 needs to be adjusted, the driving assembly 360 is rotated by workers or electric control, the blocking assembly 320 is driven to rotate by the driving assembly 360, the first blocking plate 330 is rotated by the blocking assembly 320, the first blocking plate 330 is rotated relative to the second blocking plate 340, the size of the flow part corresponding to the first blocking plate 330 and the second blocking plate 340 is adjusted, and the size of the return flow speed of the circulation pipe 200 is realized;

[0056] The flow amount of the circulation pipe 200 is adjusted by the cooperation of the first blocking plate 330 and the second blocking plate 340, the main valve can meet the test under different use powers, the return flow speed of the steam turbine valve can be controlled, and the return flow time is prolonged;

[0057] The return flow speed of the pressure oil return gas is realized by the arrangement of the choke pipe 310;

[0058] The normal installation and use of the plugging assembly 320, the first plugging plate 330 and the second plugging plate 340 are ensured by the arrangement of the flow resistance pipe 310.

[0059] In some embodiments of the utility model, in order to adjust the backflow speed, referring to Figure 2 As shown in the figure, a plurality of channels 370 in annular array are uniformly distributed on the first plugging plate 330 and the second plugging plate 340.

[0060] The normal flow of the internal substance of the flow resistance pipe 310 is realized by the arrangement of the channel 370, and when the first plugging plate 330 rotates, the size of the overlapping of the channels 370 on the first plugging plate 330 and the second plugging plate 340 is adjusted, and the flow speed of the substance is adjusted.

[0061] In some embodiments of the utility model, referring to Figure 3 And Figure 4 As shown in the figure, the plugging assembly 320 comprises:

[0062] The receiving ring 321 is fixed on the outside of the first plugging plate 330.

[0063] The outer ring 322 is fixed on the outside of the receiving ring 321 and extends to the outside of the flow resistance pipe 310.

[0064] The friction groove 323 is arranged on the outside of the outer ring 322, and the inner wall of one side of the friction groove 323 is provided with a convex indentation for increasing friction, and the other side is relatively smooth and can reduce the friction.

[0065] The two sides of the receiving ring 321 are respectively extruded with the two flow resistance pipes 310, so as to achieve the effect of preliminary sealing and ensure the normal installation and fixation of the first plugging plate 330.

[0066] The driving assembly 360 is normally driven to rotate the friction groove 323 when rotating by matching the arrangement of the friction groove 323 with the driving assembly 360.

[0067] In some embodiments of the utility model, in order to ensure the sealing of the connection of the plugging assembly 320, referring to Figure 3 And Figure 4 As shown in the figure, the plugging assembly 320 further comprises:

[0068] The sealing ring 324 is bonded to the inner surface of the outer ring 322 and is in contact with the flow resistance pipe 310, and the sealing ring 324 is always in a compressed state.

[0069] The connection between the outer ring 322 and the flow resistance pipe 310 is sealed by the arrangement of the sealing ring 324, so as to avoid leakage.

[0070] In some embodiments of the utility model, in order to guarantee the normal connection of two flow resistance pipes 310, refer to Figure 3 And Figure 4 As shown, the receiving shell assembly 350 includes:

[0071] Annular shell 351, annular shell 351 is sleeved on the outside of outer ring 322;

[0072] Side plate 352, side plate 352 is provided with two, and is fixed on the outside of two flow resistance pipes 310 respectively, and is fixedly connected with annular shell 351 through bolt.

[0073] Wherein, the setting of annular shell 351 can limit outer ring 322, avoid the shaking of outer ring 322 under the action of external force;

[0074] Wherein, the setting of side plate 352 is connected with annular shell 351, and the relative position between two flow resistance pipes 310 is positioned by annular shell 351.

[0075] In some embodiments of the utility model, in order to normally drive the rotation of first sealing plate 330, refer to Figure 3 And Figure 4 As shown, the drive assembly 360 includes:

[0076] Friction wheel 361, friction wheel 361 is inserted into the inside of friction groove 323, and is in friction contact with the inside wall of one side of friction groove 323;

[0077] Extension rod 362, extension rod 362 is fixed on friction wheel 361, and passes through annular shell 351;

[0078] Rotary key 363, rotary key 363 is fixed on the outer end of extension rod 362.

[0079] Wherein, external force is applied to rotary key 363, rotary key 363 drives friction wheel 361 to rotate through extension rod 362, friction wheel 361 relies on friction to apply rotating force to friction groove 323, outer ring 322 is driven to rotate under the drive of friction wheel 361, outer ring 322 drives first sealing plate 330 to rotate, and the flow amount is adjusted.

[0080] In some embodiments of the utility model, in order to display the rotation amount of first sealing plate 330, refer to Figure 3 And Figure 4 As shown, scale disc 353 is fixedly installed on the outside of annular shell 351, and pointer 364 corresponding to scale disc 353 is fixedly installed on the outside of rotary key 363.

[0081] Wherein, the cooperation of scale disc 353 and pointer 364 can accurately control the backflow speed of circulating pipe 200, and the accuracy of activity test is improved.

[0082] The working method of the utility model:

[0083] When the size of the flow is adjusted, an external force is applied to the rotating key 363, the rotating key 363 drives the friction wheel 361 to rotate, the friction wheel 361 drives the outer ring 322 to rotate, the outer ring 322 drives the first plugging plate 330 to rotate, and the size of the overlap of the passageway 370 on the first plugging plate 330 and the second plugging plate 340 is adjusted;

[0084] The high-pressure main valve, the medium-pressure main valve and the medium-pressure regulating valve each increase one independent "valve activity test button", the corresponding valve is tested by operating the test button, the high-pressure / medium-pressure main valve is a two-position valve with full opening and full closing, the opening and closing actions of the main valve are controlled by the directional electromagnetic valve on the oil driver, after the activity test is put into, the directional electromagnetic valve of the oil driver corresponding to the main valve is electrified, and the valve starts to slowly close; when the valve position feedback is less than 90%, the activity test command signal is automatically reset, the directional electromagnetic valve of the oil driver loses power, the valve is re-opened to the full opening position, the test process is ended, the medium-pressure regulating valve is precisely positioned and controlled by the electro-hydraulic servo valve, the valve activity test is carried out by reducing the valve limit of the medium regulating valve, after the activity test is put into, the control logic automatically sets the valve limit setting value of the corresponding regulating valve to 90%, the valve limit change rate is limited to 1.5% opening degree per second, under the action of the valve limit, the valve opening degree is slowly reduced to 90% by the electro-hydraulic servo valve command, the valve limit setting value is automatically restored to 105%, the valve limit change rate is limited to 1% opening degree per second, and the valve slowly returns to the full opening position under the control of the servo valve;

[0085] The specific requirements of the valve partial stroke test are as follows: the ATT valve activity test is divided into two modes: the first mode is that the valve online partial stroke activity test is selected during the operation of the unit, the test command is automatically reset in time in case of failure, and the safety of the unit is ensured, the second mode is that the ATT valve activity test is selected as full stroke test, the two kinds of ATT test process control logics should be independent of each other and do not interfere with each other, the safety of the unit must be ensured during the two tests, the number block of the partial activity stroke parameters is reserved in the valve partial activity test requirement logic, so that the test opening degree can be adjusted according to the operation condition in the later period, the valve partial activity test should be mutually locked, and the activity test of other valves is not allowed during the activity test of any valve, and necessary function buttons such as test and cancel are set on the screen.

[0086] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A steam turbine valve motion testing device, characterized by, It includes: A main steam valve (100); A circulating pipe (200) in communication with the main steam valve (100), and an electromagnetic valve and a servo valve are sequentially installed on the circulating pipe (200); A throttling assembly (300) installed on the circulating pipe (200) for controlling the length of time of oil return of the circulating pipe (200); The throttling assembly (300) includes: Two choke pipes (310); A plugging assembly (320) rotatably installed between the two choke pipes (310); A first plugging plate (330) fixed inside the plugging assembly (320); A second plugging plate (340) fixed inside the choke pipe (310) and in sealing contact with the first plugging plate (330); A receiving shell assembly (350) fixed outside the choke pipe (310) and wrapping the plugging assembly (320); A drive assembly (360) rotatably installed on the plugging assembly (320) and extending outside the receiving shell assembly (350).

2. The steam turbine valve movement test device according to claim 1, characterized in that: The first plugging plate (330) and the second plugging plate (340) are both provided with a plurality of annularly arrayed and uniformly distributed channels (370).

3. The steam turbine valve movement test device according to claim 1, characterized in that: The plugging assembly (320) includes: A receiving ring (321) fixed outside the first plugging plate (330); An outer ring (322) fixed outside the receiving ring (321) and extending outside the choke pipe (310); A friction groove (323) formed on the outside of the outer ring (322).

4. The steam turbine valve movement test device according to claim 3, characterized in that: The plugging assembly (320) further includes: A sealing ring (324) bonded to the inner surface of the outer ring (322) and in contact with the choke pipe (310).

5. The steam turbine valve movement test device according to claim 3, characterized in that: The receiving shell assembly (350) includes: An annular shell (351) sleeved outside the outer ring (322); Two side plates (352) fixed outside the two choke pipes (310) and fixedly connected with the annular shell (351) by bolts.

6. The steam turbine valve movement test device according to claim 5, characterized in that: The drive assembly (360) includes: A friction wheel (361) inserted into the inside of the friction groove (323) and in frictional contact with the inner wall of one side of the friction groove (323). An extension rod (362) is fixed on the friction wheel (361) and passes through the annular shell (351); A rotating key (363) is fixed on the outer end of the extension rod (362).

7. The device according to claim 6, characterized in that: A scale disc (353) is fixed on the outside of the annular shell (351), and a pointer (364) corresponding to the scale disc (353) is fixed on the outside of the rotating key (363).

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