Device for judging main distribution operation rejection of speed regulator of water-turbine generator set

Abstract

The utility model provides a water-turbine generator set governor main distribution refusing device comprising a main distribution valve core and a micro stroke switch, the main distribution valve core is connected with one end of a main distribution position transmission plate, the middle part of a lever is rotatably connected with a lever support, one end of the lever is provided with a trigger bolt, and the other end of the lever is provided with a micro bolt. A buffer spring is arranged between the end part of the lever and the lower end of the inching bolt, the lower end of the trigger bolt is connected with the end part of the main distribution position transmission plate, and the inching bolt is propped against the sensing end of the inching travel switch to form signal feedback connection; an overload clutch mechanism is further arranged on the lever support and the lever and used for enabling the stroke range of the lever not to exceed the rated action range of the micro stroke switch. The problems that a microswitch transmission mechanism is prone to fatigue and bending, and consequently main distribution rejection signals are insensitive in detection and even cannot be detected are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water turbine generator set governor, especially to a device for judging main pressure distribution refusal of water turbine generator set governor. BACKGROUND

[0002] The main pressure distribution valve is a core component in the control of the water turbine governor, responsible for controlling the pressure distribution of the guide vane or runner servomotor, and directly affects the operation state of the water turbine. Since the main pressure distribution valve needs to move up and down continuously, its failure may cause movement obstruction, and the long-time movement characteristics make it difficult to judge the failure in real time, increasing the risk of unit operation.

[0003] The main pressure distribution refusal device can timely detect and respond to these failures to prevent potential serious problems. The detection of the main pressure distribution refusal signal is divided into contact type and non-contact type. The contact type main pressure distribution refusal detection device usually uses a travel switch or a micro switch, relying on mechanical contact to detect the action state of the main pressure distribution valve, and then achieving the control effect. However, the traditional micro switch lever has small hardness and is easy to bend. During the adjustment process, it may not be sensitive to movement, and even serious consequences such as failure to detect the "main pressure distribution refusal" signal may occur. SUMMARY

[0004] The main purpose of the utility model is to provide a device for judging main pressure distribution refusal of water turbine generator set governor, solving the problem of fatigue bending of the micro switch transmission mechanism, leading to insensitive or even undetectable main pressure distribution refusal signal detection.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a device for judging main pressure distribution refusal of water turbine generator set governor, comprising a main pressure distribution valve core and a micro travel switch, the main pressure distribution valve core is connected with one end of a main pressure distribution position transmission plate, the middle part of a lever is rotationally connected with a lever support, one end of the lever is provided with a trigger bolt, the other end is provided with a micro bolt, a buffer spring is arranged between the end of the lever and the lower end of the micro bolt, the lower end of the trigger bolt is connected with the end of the main pressure distribution position transmission plate, the micro bolt abuts on the sensing end of the micro travel switch, and a signal feedback connection is formed.

[0006] An overload clutch mechanism is further arranged on the lever support and the lever, for limiting the stroke range of the lever to be within the rated action range of the micro travel switch.

[0007] In the preferred scheme, the lower end of the micro bolt passes through the through hole at one end of the lever, is sleeved in the buffer spring, the lower end of the micro bolt is connected with a baffle, one end of the buffer spring is connected with the baffle, the other end abuts on the lower surface of the lever, and the upper end of the micro bolt is provided with a locking nut and an adjusting nut, for tightly abutting the lever on the buffer spring.

[0008] In the preferred solution, the main distribution valve core is sleeved in the two main distribution valve connecting plates, and the main distribution position transmission plate is sleeved on the two main distribution valve connecting plates on the main distribution valve core, and is used to move up and down with the opening and closing of the main distribution valve core.

[0009] In the preferred solution, the lever is divided into a first lever in contact with the main distribution valve core and a second lever in contact with the micro-motion stroke switch at the rotating connection with the lever support. The first lever is rotatably connected to one side of the lever support through a first rotating shaft, and the second lever is rotatably connected to the other side of the lever support through a second rotating shaft. The first lever and the other side of the second lever abut against each other and are provided with a friction surface for transmitting the movement of the first lever to the second lever.

[0010] In the preferred solution, the lever support is further provided with support plates on both sides, and the first rotating shaft and the second rotating shaft are rotatably connected through the lever support and the support plates. The outer ends are provided with stepped shafts, the stepped shafts are sleeved in the contraction springs, one end of the contraction spring abuts against the end face of the stepped shaft, and the other end abuts against the inner surface of the support plate to drive the first lever and the second lever away from the friction surface.

[0011] In the preferred solution, one side of the support plate is provided with a rotating seat, and the first rotating shaft and the second rotating shaft are further provided with moving grooves. The middle part of the shift fork is rotatably connected to the rotating seat, one end abuts against the moving groove, and the other end abuts against the lower end plane of the limiting rod to drive the first rotating shaft and the second rotating shaft to move towards each other along the axial direction, so that the friction surfaces tightly abut against each other.

[0012] In the preferred solution, the rotating seat is further provided with a limiting seat outside, and the limiting rod has a reverse L-shaped main body structure symmetrically arranged on both sides of the lever support. The lower end penetrates through the limiting seat, and the vertical crossbars are arranged above the first lever and the second lever, respectively. The height is adapted to the rated action range of the micro-motion stroke switch.

[0013] In the preferred solution, the limiting rod is further provided with a fixing ring in the middle part, and a return spring is sleeved on the limiting rod. One end of the return spring is connected to the middle part of the limiting rod through the fixing ring, and the other end is connected to the upper surface of the limiting seat to drive the limiting rod to return to the limiting height.

[0014] In the preferred solution, the end of the shift fork is provided with a flange, and the lower end of the limiting rod is provided with a concave surface corresponding to the flange. When the flange abuts against the concave surface, the shift fork drives the two friction surfaces to be out of contact.

[0015] In the preferred solution, the two groups of shift forks and limiting rods are diagonally arranged along the hinge points of the lever support, and together with the first lever and the second lever provided with the friction surface, they form an overload clutch mechanism.

[0016] The utility model provides a kind of device for judging water turbine generator set governor main allocation refuses to move, main allocation valve core is connected with the one end of lever by main allocation position transmission plate, micro motion stroke switch is contacted with the other end of lever by micro motion bolt, constitute signal feedback connection, part kinetic energy generated in the moving process of lever is absorbed by setting buffer spring, so that it judges the signal of main allocation refuses to move more sensitive, avoid the condition that micro motion stroke switch occurs deformation due to mechanical component frequent stress, when lever forms more than micro motion stroke switch rated action range, automatically remove transmission by setting overload clutch mechanism, avoid irreversible damage to micro motion stroke switch, prolong the service life of micro motion stroke switch, improve the stability and reliability of judging signal in long-term operation, accurately reflect the state of main allocation refuses to move. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described below in connection with the drawings and examples:

[0018] Figure 1 It is the overall appearance structure diagram of the utility model;

[0019] Figure 2 It is the main allocation valve core and first lever connection structure diagram of the utility model;

[0020] Figure 3 It is the micro motion stroke switch and second lever connection structure diagram of the utility model;

[0021] Figure 4 It is the overload clutch mechanism structure diagram of the utility model;

[0022] Figure 5 It is the overload clutch mechanism structure diagram under explosion mode of the utility model;

[0023] Figure 6 It is the lever support seat disassembly structure diagram of the utility model.

[0024] In the drawing: main allocation valve core 1;Micro motion stroke switch 2;Main allocation position transmission plate 3;Lever support seat 4;Supporting plate 401;Rotary seat 402;Limiting seat 403;Lever 5;First lever 501;Second lever 502;First rotation shaft 503;Second rotation shaft 504;Moving groove 505;Trigger bolt 6;Micro motion bolt 7;Buffer spring 8;Baffle 9;Lock nut 10;Adjusting nut 11;Main allocation pressure valve connecting plate 12;Contraction spring 13;Pole fork 14;Flange 1401;Limiting rod 15;Fixed ring 1501;Concave arc surface 1502;Return spring 16. DETAILED DESCRIPTION

[0025] Example 1

[0026] As Figures 1-6As shown, a device for judging the main governing valve of the hydroelectric generator set is provided, which comprises a main governing valve core 1 and a micro-motion stroke switch 2, the main governing valve core 1 is connected with one end of a main governing position transmission plate 3, the middle part of a lever 5 is rotationally connected with a lever support 4, one end of the lever 5 is provided with a trigger bolt 6, and the other end of the lever 5 is provided with a micro-motion bolt 7, a buffer spring 8 is arranged between the end of the lever 5 and the lower end of the micro-motion bolt 7, the lower end of the trigger bolt 6 is connected with the end of the main governing position transmission plate 3, the micro-motion bolt 7 abuts against the sensing end of the micro-motion stroke switch 2, and a signal feedback connection is formed.

[0027] The lever support 4 and the lever 5 are further provided with an overload clutch mechanism, which is used for ensuring that the stroke range of the lever 5 does not exceed the rated action range of the micro-motion stroke switch 2.

[0028] In the preferred embodiment, the lower end of the micro-motion bolt 7 penetrates through the through hole of one end of the lever 5, is sleeved in the buffer spring 8, the lower end of the micro-motion bolt 7 is connected with a baffle 9, one end of the buffer spring 8 is connected with the baffle 9, and the other end of the buffer spring 8 abuts against the lower surface of the lever 5, the upper end of the micro-motion bolt 7 is provided with a locking nut 10 and an adjusting nut 11, which are used for tightly abutting the lever 5 against the buffer spring 8.

[0029] The adjusting nut 11 is used for adjusting the height of the end of the lever 5 on the micro-motion bolt 7, and the locking nut 10 is used for locking the height.

[0030] In the preferred embodiment, the main governing valve core 1 is sleeved in two main governing pressure valve connecting plates 12, and one end of the main governing position transmission plate 3 is sleeved on the main governing valve core 1 between the two main governing pressure valve connecting plates 12, which is used for moving up and down along with the opening and closing of the main governing valve core 1.

[0031] In the preferred embodiment, the main governing valve core 1 is sleeved in two main governing pressure valve connecting plates 12, and one end of the main governing position transmission plate 3 is sleeved on the main governing valve core 1 between the two main governing pressure valve connecting plates 12, which is used for moving up and down along with the opening and closing of the main governing valve core 1.

[0032] In the preferred embodiment, the main governing valve core 1 is sleeved in two main governing pressure valve connecting plates 12, and one end of the main governing position transmission plate 3 is sleeved on the main governing valve core 1 between the two main governing pressure valve connecting plates 12, which is used for moving up and down along with the opening and closing of the main governing valve core 1.

[0033] In the preferred embodiment, the lever 5 is divided into a first lever 501 in contact with the main valve core 1 and a second lever 502 in contact with the micro-motion stroke switch 2 at the rotating connection with the lever support 4. The first lever 501 is rotatably connected to one side of the lever support 4 through a first rotating shaft 503, and the second lever 502 is rotatably connected to the other side of the lever support 4 through a second rotating shaft 504. The first lever 501 and the second lever 502 abut against each other on the other side and are provided with friction surfaces for transmitting the movement of the first lever 501 to the second lever 502.

[0034] In the preferred embodiment, the lever support 4 is further provided with support plates 401 on both sides. The first rotating shaft 503 and the second rotating shaft 504 are rotatably connected to the lever support 4 and the support plates 401. The outer ends of the first rotating shaft 503 and the second rotating shaft 504 are provided with stepped shafts. The stepped shafts are sleeved in the contraction spring 13, with one end abutting against the end face of the stepped shaft and the other end abutting against the inner surface of the support plate 401, driving the friction surfaces of the first lever 501 and the second lever 502 to move away.

[0035] In the preferred embodiment, one side of the support plate 401 is provided with a rotating seat 402. The first rotating shaft 503 and the second rotating shaft 504 are further provided with moving grooves 505. The middle part of the shift fork 14 is rotatably connected to the rotating seat 402, with one end abutting against the moving grooves 505 and the other end abutting against the lower end plane of the limiting rod 15, for driving the first rotating shaft 503 and the second rotating shaft 504 to move closer to each other along the axial direction, so that the friction surfaces tightly abut against each other for transmission.

[0036] In the preferred embodiment, the rotating seat 402 is further provided with a limiting seat 403 on the outer side. The limiting rod 15 has a main body structure in the shape of an inverted L and is symmetrically arranged on both sides of the lever support 4. The lower end of the limiting rod 15 passes through the limiting seat 403, and the vertical crossbars are arranged above the first lever 501 and the second lever 502, with their heights being adapted to the rated action range of the micro-motion stroke switch 2.

[0037] In the preferred embodiment, the middle part of the limiting rod 15 is further provided with a fixing ring 1501. The return spring 16 is sleeved on the limiting rod 15, with one end connected to the middle part of the limiting rod 15 through the fixing ring 1501 and the other end connected to the upper surface of the limiting seat 403, for driving the limiting rod 15 to return to its limiting height.

[0038] In the preferred embodiment, the end of the shift fork 14 is provided with a flange 1401, and the lower end of the limiting rod 15 is provided with a concave surface 1502 corresponding to the flange 1401. When the flange 1401 abuts against the concave surface 1502, the shift fork 14 drives the two friction surfaces to be out of contact.

[0039] In the preferred embodiment, the two sets of shift forks 14 and limiting rods 15 are diagonally arranged along the hinge points of the lever support 4, and together with the first lever 501 and the second lever 502 provided with friction surfaces, they form an overload clutch mechanism.

[0040] When the moving range of the two ends of the lever 5 is within the rated action range of the micro-motion stroke switch 2, the limiting rod 15 is not triggered to move upward, and is fixed at the rated height under the action of the return spring 16, at which time the lower end plane area of the limiting rod 15 abuts against the flange 1401 at the end of the yoke 14, the yoke 14 rotates around the rotating seat 402, the fork part of the yoke 14 is clamped in the moving groove 505, and the first rotating shaft 503 and the second rotating shaft 504 on the two sides are driven to approach each other, the two lever friction surfaces are tightly attached to each other for friction, and complete transmission of the two ends of the connecting rod is realized.

[0041] When the moving range of the two ends of the lever 5 exceeds the rated action range of the micro-motion stroke switch 2, i.e. the first lever 501 triggers the lower stroke limiting of the micro-motion stroke switch 2 or the second lever 502 triggers the upper stroke limiting of the micro-motion stroke switch 2, the limiting rod 15 is driven upward by the lever 5, the abutting position of the flange 1401 moves to the concave arc surface 1502 area, the return spring 16 cancels the driving force of the contraction spring 13, the first rotating shaft 503 and the second rotating shaft 504 are driven to move away from each other by the contraction spring 13, and the yoke 14 rotates accordingly, the concave arc surface 1502 provides a rotating space for the yoke 14.

[0042] When the moving range of the two ends of the lever 5 returns to the normal range, i.e. the limiting rod 15 is no longer driven upward, the limiting rod 15 returns to the limiting height under the driving of the return spring 16, the flange 1401 moves from the concave arc surface 1502 area back to the plane area, the yoke 14 rotates, the two side pulling forces of the contraction spring 13 are cancelled, the two friction surfaces are driven to be tightly attached again, and the complete mechanical transmission path of the lever 5 is restored.

[0043] The overload clutch mechanism has compact structure, is not prone to failure, can flexibly adjust the triggering force of the clutch according to actual needs, is suitable for different load conditions, and has good protection effect.

[0044] The above-described embodiments are only preferred technical solutions of the utility model, and should not be regarded as limiting the utility model, and the protection scope of the utility model should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements in this range are also within the protection scope of the utility model.

Claims

1. A device for judging the main governing valve spool of a hydroelectric generating unit governor, comprising a main governing valve spool (1) and a micro-motion stroke switch (2), characterized in that the main governing valve spool (1) is provided with a micro-motion stroke switch (2) on the side of the main governing valve spool (1) facing the micro-motion stroke switch (2). The valve core (1) is connected with one end of the main distribution position transmission plate (3), the middle of the lever (5) is rotatably connected with the lever support (4), one end of the lever (5) is provided with a trigger bolt (6), the other end of the lever (5) is provided with a micro-motion bolt (7), the buffer spring (8) is arranged between the end of the lever (5) and the lower end of the micro-motion bolt (7), the lower end of the trigger bolt (6) is connected with the end of the main distribution position transmission plate (3), the micro-motion bolt (7) abuts on the sensing end of the micro-motion stroke switch (2), and the signal feedback connection is formed. The lever support (4) and the lever (5) are further provided with an overload clutch mechanism, which is used for ensuring that the stroke range of the lever (5) does not exceed the rated action range of the micro-motion stroke switch (2).

2. The device for judging the main setting refusal of the governor of the hydraulic generator set according to claim 1, characterized in that: The lower end of the micro-motion bolt (7) penetrates through the through hole of one end of the lever (5), is sleeved in the buffer spring (8), the lower end of the micro-motion bolt (7) is connected with the baffle (9), one end of the buffer spring (8) is connected with the baffle (9), the other end of the buffer spring (8) abuts on the lower surface of the lever (5), the upper end of the micro-motion bolt (7) is provided with the locking nut (10) and the adjusting nut (11), and the lever (5) is tightly abutted on the buffer spring (8).

3. The device for judging the main setting of the governor of the hydraulic generator set according to claim 1, characterized in that: The main distribution valve core (1) is sleeved in the two main distribution pressure valve connecting plates (12), one end of the main distribution position transmission plate (3) is sleeved on the two main distribution pressure valve connecting plates (12) between the main distribution valve core (1), and is used for moving up and down with the opening and closing of the main distribution valve core (1).

4. The device for judging the main setting and refusing motion of the speed regulator of the hydraulic generator set according to claim 1, characterized in that: The lever (5) is divided into a first lever (501) in contact with the main distribution valve core (1) and a second lever (502) in contact with the micro-motion stroke switch (2) at the rotatable connection with the lever support (4), one side of the first lever (501) is rotatably connected with one side of the lever support (4) through the first rotating shaft (503), one side of the second lever (502) is rotatably connected with the other side of the lever support (4) through the second rotating shaft (504), the other sides of the first lever (501) and the second lever (502) abut against each other and are provided with friction surfaces, and the movement of the first lever (501) is transmitted to the second lever (502).

5. The device for judging the main setting of the governor of the hydraulic generator set according to claim 4, characterized in that: The lever support (4) is further provided with the support plate (401) on both sides, the first rotating shaft (503) and the second rotating shaft (504) are rotatably connected through the lever support (4) and the support plate (401), the outer ends are provided with stepped shafts, the stepped shafts are sleeved in the contraction spring (13), one end of the contraction spring (13) abuts on the end face of the stepped shaft, and the other end abuts on the inner surface of the support plate (401), so that the friction surfaces of the first lever (501) and the second lever (502) are driven to move away.

6. The device for judging the main setting of the speed regulator of the hydraulic generator set according to claim 5, characterized in that: One side of the support plate (401) is provided with the rotating seat (402), the first rotating shaft (503) and the second rotating shaft (504) are further provided with the moving groove (505), the middle of the shift fork (14) is rotatably connected with the rotating seat (402), one end abuts in the moving groove (505), and the other end abuts on the lower end plane of the limiting rod (15), so that the first rotating shaft (503) and the second rotating shaft (504) are driven to move close to each other along the axial direction, and the friction surfaces are tightly abutted.

7. The device for judging the main setting of the speed regulator of the hydraulic generator set according to claim 6, characterized in that: The rotating seat (402) is further provided with a limiting seat (403), and the limiting rod (15) has a reverse L-shaped main body structure and is symmetrically arranged on both sides of the lever support (4). The lower end of the limiting rod (15) penetrates through the limiting seat (403), and the vertical crossbar is arranged above the first lever (501) and the second lever (502) respectively, and the height thereof is adapted to the rated action range of the micro-motion travel switch (2).

8. The device for judging the main setting of the speed regulator of the hydraulic generator set according to claim 7, characterized in that: The middle part of the limiting rod (15) is further provided with a fixing ring (1501), the return spring (16) is sleeved on the limiting rod (15), one end of the return spring (16) is connected with the middle part of the limiting rod (15) through the fixing ring (1501), and the other end is connected with the upper surface of the limiting seat (403), so as to drive the limiting rod (15) to return to the limiting height.

9. The device for judging the main setting of the speed regulator of the hydraulic generator set according to claim 7, characterized in that: The end of the shifting fork (14) is provided with a flange (1401), and the lower end of the limiting rod (15) is provided with a concave arc surface (1502) corresponding to the flange (1401), so that when the flange (1401) abuts against the concave arc surface (1502), the shifting fork (14) drives the two friction surfaces to be out of contact.

10. The device for judging the main governor failure of the hydroelectric generator set according to any one of claims 6-9, characterized in that: The two groups of shifting forks (14) and limiting rods (15) are diagonally arranged along the hinge points of the lever support (4), and together with the first lever (501) and the second lever (502) provided with the friction surfaces, the overload clutch mechanism is formed.

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