A reliable governor guide vane servomotor hydraulic locking system

Abstract

The application discloses a reliable governor guide vane servomotor hydraulic locking system, which comprises a governor fault detection circuit (1), a governor remote automatic control circuit (2), a monitoring circuit (3), a redundant UPC fault circuit (4), a locking input circuit (5) and a locking exit circuit (6) which are connected with a power supply in parallel respectively; the locking input circuit (5) comprises a first hydraulic locking input position switch (7) and a second hydraulic locking input position switch (8) which are connected in series; and the locking exit circuit (6) comprises a first hydraulic locking exit position switch (9) and a second hydraulic locking exit position switch (10) which are connected in series. The application has the characteristics of effectively improving the stability of the unit operation.

Description

Technical Field

[0001] This invention relates to the field of hydraulic locking of governor guide vane relay, and in particular to a reliable hydraulic locking system for governor guide vane relay. Background Technology

[0002] When the hydropower station generator unit is shut down, the governor guide vanes are in the closed position. To prevent the governor guide vanes from accidentally opening, a guide vane servo hydraulic locking mechanism is installed. There are two hydraulic locks: a first hydraulic lock, corresponding to position switches CG346 (engaged) and CG348 (disengaged); and a second hydraulic lock, corresponding to position switches CG345 (engaged) and CG347 (disengaged). In other words, the guide vane servo hydraulic lock has two position switches. However, traditional designs only use one pair of nodes from the two pairs for signal feedback, resulting in low reliability and signal feedback problems. For example, selecting CG346 (engaged) and CG348 (disengaged) as the signal response nodes only reflects the position of the first hydraulic lock and not the position of the second hydraulic lock. Then, a special case arises where the first hydraulic lock disengages, but the second hydraulic lock does not. In this case, if the generator is running, the second hydraulic lock will rub against the servo as the servo moves, causing scratches and potentially leading to a malfunction and poor unit operation stability. Therefore, existing technologies suffer from poor unit operation stability. Summary of the Invention

[0003] The purpose of this invention is to provide a reliable hydraulic locking system for governor guide vane relays. This invention effectively improves the operational stability of the generator unit.

[0004] The technical solution of the present invention is as follows: A reliable hydraulic locking system for a governor guide vane relay includes a governor fault detection circuit, a governor remote automatic control circuit, a monitoring circuit, a redundant UPC fault circuit, a locking engagement circuit, and a locking disengagement circuit, all connected in parallel with a power supply. The locking engagement circuit includes a first hydraulic locking engagement position switch and a second hydraulic locking engagement position switch connected in series. The locking disengagement circuit includes a first hydraulic locking disengagement position switch and a second hydraulic locking disengagement position switch connected in series.

[0005] In the aforementioned reliable speed governor guide vane relay hydraulic locking system, the first hydraulic locking engagement position switch and the first hydraulic locking disengagement position switch are located on the upper part of the guide vane relay body; an upper hydraulic locking column is provided above the guide vane relay body, and an upper contact plate is provided on the upper hydraulic locking column to cooperate with the first hydraulic locking engagement position switch and the first hydraulic locking disengagement position switch respectively;

[0006] The second hydraulic locking engagement switch and the second hydraulic locking disengagement switch are located at the lower part of the guide vane servo motor body. A lower hydraulic locking column is provided below the guide vane servo motor body, and a lower contact plate is provided on the lower hydraulic locking column.

[0007] In the aforementioned reliable speed governor guide vane relay hydraulic locking system, both the upper and lower ends of the guide vane relay body are provided with switch position adjustment plates. The switch position adjustment plates are provided with vertical slide rails, the sides of the vertical slide rails are provided with scales, the vertical slide rails are provided with switch mounting slides, and the switch mounting slides are provided with locking screws that cooperate with the vertical slide rails.

[0008] In the aforementioned reliable governor guide vane relay hydraulic locking system, both the upper and lower contact plates include a contact plate body, and the contact ends of the upper and lower surfaces of the contact plate body are provided with detachable contact plates; the contact ends of the upper and lower surfaces of the contact plate body are provided with mounting slots; the detachable contact plate is provided with a plug-in block that mates with the mounting slot; an I-shaped locking member is provided between the ends of the upper and lower mounting slots, and the I-shaped locking member is locked to the contact plate body by screws.

[0009] In the aforementioned reliable governor guide vane relay hydraulic locking system, the detachable contact plate includes a metal contact plate, with a shock-absorbing pad on the inner side of the metal contact plate, and a plug block located on the surface of the shock-absorbing pad.

[0010] Compared with existing technologies, this invention connects the hydraulic locking engagement and engagement position switches in series in the locking engagement circuit, and the first and second hydraulic locking disengagement position switches in series in the locking disengagement circuit. When the first and second hydraulic locking switches of the guide vane servo simultaneously disengage, the hydraulic locking disengages; when the first and second hydraulic locking switches simultaneously engage, the hydraulic locking engages. This significantly reduces the risk of hydraulic locking failure, improves unit operational stability, and reduces the probability of unit shutdown due to accidents. In summary, this invention effectively improves unit operational stability. Attached Figure Description

[0011] Figure 1 This is the circuit control schematic diagram of the present invention;

[0012] Figure 2 This is a structural view of the guide vane relay;

[0013] Figure 3 This is a structural view of the switch position adjustment plate;

[0014] Figure 4 This is a structural view of the upper touch panel;

[0015] Figure 5 This is a side view of the touchpad body.

[0016] The labels in the attached diagram are as follows: 1-Governor fault detection circuit, 2-Governor remote automatic control circuit, 3-Monitoring circuit, 4-Redundant UPC fault circuit, 5-Lock-in circuit, 6-Lock-out circuit, 7-First hydraulic lock-in position switch, 8-Second hydraulic lock-in position switch, 9-First hydraulic lock-out position switch, 10-Second hydraulic lock-out position switch, 11-Guide vane relay body, 12-Upper hydraulic locking column, 13-Upper contact plate, 14-Lower hydraulic locking column, 15-Lower contact plate, 16-Switch position adjustment plate, 17-Vertical slide rail, 18-Switch mounting slide, 19-Contact plate body, 20-Removable contact plate, 21-Mounting slot, 22-Plug-in block, 23-I-shaped locking component. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0018] Example. A reliable governor guide vane relay hydraulic locking system, configured as follows: Figure 1-5 As shown, it includes a speed controller fault detection circuit 1, a speed controller remote automatic control circuit 2, a monitoring circuit 3, a redundant UPC fault circuit 4, a lock engagement circuit 5, and a lock disengagement circuit 6, all connected in parallel with the power supply. The lock engagement circuit 5 includes a first hydraulic lock engagement position switch 7 and a second hydraulic lock engagement position switch 8 connected in series. The lock disengagement circuit 6 includes a first hydraulic lock disengagement position switch 9 and a second hydraulic lock disengagement position switch 10 connected in series.

[0019] The first hydraulic locking engagement position switch 7 and the first hydraulic locking disengagement position switch 9 are located on the upper part of the guide vane servoir body 11; an upper hydraulic locking column 12 is provided above the guide vane servoir body 11, and an upper contact plate 13 is provided on the upper hydraulic locking column 12 to cooperate with the first hydraulic locking engagement position switch 7 and the first hydraulic locking disengagement position switch 9 respectively.

[0020] The second hydraulic locking engagement position switch 8 and the second hydraulic locking disengagement position switch 10 are located at the lower part of the guide vane relay body 11. A lower hydraulic locking column 14 is provided below the guide vane relay body 11, and a lower contact plate 15 is provided on the lower hydraulic locking column 14.

[0021] The guide vane relay body 11 is provided with switch position adjustment plates 16 at both the upper and lower ends. The switch position adjustment plates 16 are provided with vertical slide rails 17. The vertical slide rails 17 are provided with scales on their sides. The vertical slide rails 17 are provided with switch mounting slides 18. The switch mounting slides 18 are provided with locking screws that cooperate with the vertical slide rails 17.

[0022] Both the upper touch plate 13 and the lower touch plate 15 include a touch plate body 19, and the contact ends of the upper and lower surfaces of the touch plate body 19 are provided with detachable touch plates 20; the contact ends of the upper and lower surfaces of the touch plate body 19 are provided with mounting slots 21; the detachable touch plate 20 is provided with a plug-in block 22 that mates with the mounting slot 21; an I-shaped locking member 23 is provided between the ends of the two mounting slots 21, and the I-shaped locking member 23 is locked to the touch plate body 19 by screws.

[0023] The detachable contact plate 20 includes a metal contact plate 201, with a shock-absorbing pad 202 on the inner side of the metal contact plate 201, and a plug-in block 22 located on the surface of the shock-absorbing pad 202.

[0024] The upper hydraulic locking column is equipped with upper contact plates that respectively cooperate with the first hydraulic locking engagement position switch and the first hydraulic locking disengagement position switch;

[0025] The lower hydraulic locking column is equipped with a lower contact plate that respectively cooperates with the second hydraulic locking engagement position switch and the second hydraulic locking disengagement position switch.

[0026] The locking engagement and disengagement process of the present invention is as follows: when both the first hydraulic locking engagement position switch and the second hydraulic locking engagement position switch are triggered, the hydraulic locking is engaged; when both the first hydraulic locking disengagement position switch and the second hydraulic locking disengagement position switch are triggered, the hydraulic locking is disengaged.

[0027] The triggering process involves the guide vane relay body section driving the upper hydraulic locking column and / or the lower hydraulic locking column to rise and fall to the set position, so that the upper or lower contact plate triggers the position switch of the corresponding position respectively.

[0028] This invention provides a switch position adjustment plate at both the upper and lower ends of the guide vane relay body, allowing the position switch to be adjusted up and down, thereby flexibly adjusting the distance between the engagement and disengagement position switches.

[0029] The adjustment process of the position switch is as follows: According to the scale, adjust the spacing and position of the two vertically distributed switch mounting slides on the vertical slide rail, then lock the switch mounting slides in the corresponding positions with the locking screws, and finally fix the hydraulic locking engagement position switch and hydraulic locking disengagement position switch on the switch mounting slides in the corresponding positions.

[0030] The upper and lower contact plates of this invention consist of a contact plate body and a detachable contact plate. When the contact plate wears out, only the detachable contact plate needs to be replaced, making disassembly and replacement very convenient and quick. Meanwhile, the detachable contact plate consists of a metal contact plate and a shock-absorbing pad, thus providing excellent shock absorption.

[0031] Installation process of detachable contact plates: Insert the plug blocks of the upper and lower detachable contact plates into the mounting slots on the upper and lower sides of the contact plate body respectively, then insert the I-shaped locking piece into the mounting slots on the upper and lower sides, and lock it with screws to complete the installation of the detachable contact plates.

Claims

1. A reliable hydraulic locking system for a governor guide vane relay, characterized in that: The system includes a speed controller fault detection circuit (1), a speed controller remote automatic control circuit (2), a monitoring circuit (3), a redundant UPC fault circuit (4), a lock-in circuit (5), and a lock-out circuit (6), all connected in parallel with the power supply. The lock-in circuit (5) includes a first hydraulic lock-in position switch (7) and a second hydraulic lock-in position switch (8) connected in series. The lock-out circuit (6) includes a first hydraulic lock-out position switch (9) and a second hydraulic lock-out position switch (10) connected in series. The set switch (7) and the first hydraulic locking exit position switch (9) are located on the upper part of the guide vane servo body (11); an upper hydraulic locking column (12) is provided above the guide vane servo body (11), and an upper contact plate (13) is provided on the upper hydraulic locking column (12) to cooperate with the first hydraulic locking engagement position switch (7) and the first hydraulic locking exit position switch (9) respectively; the second hydraulic locking engagement position switch (8) and the second hydraulic locking exit position switch (10) are located on the lower part of the guide vane servo body (11), and a set of upper contact plates (13) are provided below the guide vane servo body (11). The lower hydraulic locking column (14) is provided with a lower contact plate (15); both the upper and lower ends of the guide vane relay body (11) are provided with switch position adjustment plates (16), the switch position adjustment plates (16) are provided with vertical slide rails (17), the vertical slide rails (17) are provided with scales on the side, the vertical slide rails (17) are provided with switch mounting slides (18), and the switch mounting slides (18) are provided with locking screws that cooperate with the vertical slide rails (17); both the upper contact plate (13) and the lower contact plate (15) include a contact plate body (19), the contact plate body The upper and lower surfaces of the body (19) are provided with detachable contact plates (20); the upper and lower surfaces of the contact plate body (19) are provided with mounting slots (21); the detachable contact plate (20) is provided with a plug-in block (22) that cooperates with the mounting slot (21); an I-shaped locking member (23) is provided between the ends of the two mounting slots (21), and the I-shaped locking member (23) is locked to the contact plate body (19) by screws; the detachable contact plate (20) includes a metal contact plate, the inner side of the metal contact plate is provided with a shock-absorbing pad, and the plug-in block (22) is located on the surface of the shock-absorbing pad.

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