Safety protection device for water guide mechanism of water turbine

Abstract

The utility model relates to the technical field of water turbines, in particular to a safety protection device of a water guide mechanism of a water turbine, which is applied to a volute of the water turbine and comprises a water turbine top cover fixed on the volute of the water turbine, a plurality of protection mechanisms are arranged on the upper end face of the water turbine top cover around a center shaft of the water turbine volute in an equidistant array mode, a rotatable mounting shaft is arranged at the center of each protection mechanism, and a plurality of electric push rods used for driving the mounting shafts to rotate are hinged to the top of the water turbine top cover around the center shaft at equal intervals. A limiting block capable of limiting the rotating angle of the mounting shaft is slidably mounted in the protection mechanism, and the top of the limiting block is hinged to the mounting shaft. A guide vane used for adjusting water flow is arranged at the bottom of the mounting shaft. The situation that the guide vanes collide due to the fact that the rotation amplitude of the installation shaft is too large is avoided, and the problem that the installation shaft is fractured due to too large stress is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water turbine, concretely relates to a safety protection device of water turbine water guide mechanism. BACKGROUND

[0002] The safety protection device of water turbine water guide mechanism is a key component to ensure the stable operation of the water turbine. It mainly includes shear pins, safety connecting rods and other devices, which are used to quickly cut off the transmission when the guide vane is abnormal or jammed, preventing damage to the water guide mechanism and affecting the safety of the unit. These protection devices are designed with exquisite design, which can automatically trigger when detecting abnormal torque, making the guide vane stop moving or keep the current position, avoiding the expansion of the fault. At the same time, they can also provide fault signals, so that the maintenance personnel can discover and handle the fault in time, ensuring the safe operation of the water turbine under complex working conditions and guaranteeing the stability and reliability of power supply.

[0003] The patent with Chinese publication number CN221742772U discloses a water guide mechanism of a water turbine, relating to the technical field of water turbine for hydroelectric power generation, which comprises: a water turbine guide mechanism main body, a blade adjusting mechanism is arranged on the water turbine guide mechanism main body, a blade upper mounting bracket is rotatably connected inside the water turbine guide mechanism main body. In the water guide mechanism of the water turbine, the guide vane structure is improved. When replacing or repairing the guide vane of the water guide mechanism, the water guide mechanism does not need to be disassembled as a whole, the damaged guide vane can be disassembled from the water guide mechanism, and the new guide vane can be fixed and installed in the water guide mechanism, so that the quick replacement of the guide vane can be completed. When the guide vane is damaged due to frequent water flow impact, the water guide mechanism needs to be disassembled as a whole to replace or repair the damaged guide vane, the maintenance of the water guide mechanism is not convenient, the maintenance efficiency is low, and professional personnel need to spend a lot of time to replace the guide vane.

[0004] The guide vane of the water guide mechanism in the above-mentioned patent document is installed on one end of the adjusting rod through the upper bracket shaft. The adjusting rod can drive the upper bracket shaft when it is in action. However, the water guide mechanism lacks an effective limiting mechanism for the upper bracket shaft, which leads to the fact that the guide vane lacks necessary constraints and may collide during the process of adjusting the position of the guide vane by the adjusting rod through the upper bracket shaft. This not only causes the upper bracket shaft to bear excessive stress, which may lead to bending or breaking of the upper bracket shaft, but also directly causes serious damage to the guide vane itself, such as crack generation and shape distortion. UTILITY MODEL CONTENTS

[0005] Aiming at the above problems, a safety protection device for a water turbine guide vane mechanism is provided, which drives the installation shaft to rotate clockwise or counterclockwise in the axial direction by using an electric push rod. When the installation shaft rotates, the limiting block is driven by the installation shaft to rotate around the center of the protection mechanism, so that the limiting block limits the rotation angle of the installation shaft, avoids the collision of the guide vane caused by the excessive rotation amplitude of the installation shaft, and solves the problem of fracture of the installation shaft caused by excessive stress.

[0006] To solve the problems in the prior art, the application provides a safety protection device for a water turbine guide vane mechanism, which is applied to a water turbine spiral case. The safety protection device for the water turbine guide vane mechanism further comprises a water turbine top cover fixed to the water turbine spiral case. A plurality of protection mechanisms are arranged at equal intervals on the upper end surface of the water turbine top cover around the central axis of the water turbine spiral case. A rotatable installation shaft is arranged at the center of each protection mechanism. A plurality of electric push rods for driving the installation shaft to rotate are arranged at equal intervals on the top of the water turbine top cover around the central axis.

[0007] A limiting block capable of limiting the rotation angle of the installation shaft is slidably arranged in the protection mechanism. The top of the limiting block is hingedly arranged with the installation shaft.

[0008] The bottom of the installation shaft is provided with a guide vane for adjusting the water flow.

[0009] As a technical solution of the application, two arc-shaped limiting grooves for installing the limiting block are symmetrically arranged on the side of the protection mechanism close to the installation shaft. Two groups of buffer springs for pushing the limiting block to reset are arranged in the inner part of the two arc-shaped limiting grooves.

[0010] As a technical solution of the application, a first connecting piece capable of being hingedly connected with the output end of the electric push rod is horizontally arranged on one side of the top end of the installation shaft.

[0011] As a technical solution of the application, a second connecting piece capable of being hingedly connected with the limiting block is symmetrically arranged on the bottom of the installation shaft close to the first connecting piece.

[0012] As a technical solution of the application, a ring seat is fixed at the center of the water turbine top cover. An installation rod for installing the electric push rod is arranged on the top of the ring seat. The output end of the electric push rod is provided with a mounting bracket capable of being hingedly connected with the first connecting piece.

[0013] As a technical solution of the application, a rotatable runner is arranged in the water turbine spiral case. An output shaft capable of extending out of the water turbine spiral case is vertically arranged at the center of the top of the runner. The output shaft is movably installed at the center of the ring seat.

[0014] As a technical scheme of the application, the mounting hole is arranged through the center of the protection mechanism, the mounting shaft is rotatably arranged in the mounting hole, and the bearing sleeve is arranged in the mounting hole to avoid abrasion when the mounting shaft rotates.

[0015] The utility model discloses the beneficial effect compared with prior art is:

[0016] The application drives the mounting shaft to rotate clockwise or counterclockwise in the axial direction by the electric push rod.When the mounting shaft rotates, the mounting shaft drives the limiting block to rotate around the center of the protection mechanism, so that the limiting block limits the rotation angle of the mounting shaft. Avoid the collision of the guide vane caused by the too large rotation amplitude of the mounting shaft, and solve the problem of fracture of the mounting shaft caused by too large stress. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of a safety protection device of a water turbine guide vane mechanism.

[0018] Figure 2 It is a top view of a safety protection device of a water turbine guide vane mechanism.

[0019] Figure 3 It is Figure 2 the sectional view of A-A.

[0020] Figure 4 It is a three-dimensional structure schematic diagram of a water turbine top cover in a safety protection device of a water turbine guide vane mechanism Figure 1 .

[0021] Figure 5 It is a three-dimensional structure schematic diagram of a water turbine top cover in a safety protection device of a water turbine guide vane mechanism Figure 2 .

[0022] Figure 6 It is a perspective view of a mounting shaft in a safety protection device of a water turbine guide vane mechanism.

[0023] Figure 7 It is a perspective view of a limiting block in a safety protection device of a water turbine guide vane mechanism.

[0024] Figure 8 It is Figure 4 the enlarged view of B in

[0025] The reference signs in the figure are: 1, water turbine spiral case; 2, water turbine top cover; 21, protection mechanism; 22, arc limiting groove; 23, limiting block; 24, buffer spring; 25, ring seat; 26, mounting rod; 27, mounting hole; 28, bearing sleeve; 3, electric push rod; 31, mounting frame; 4, mounting shaft; 41, guide vane; 42, first connecting piece; 43, second connecting piece; 5, runner; 51, output shaft. DETAILED DESCRIPTION

[0026] In order to further understand the features, technical means and specific purposes and functions achieved by the utility model, the utility model will be described in further detail below in combination with the drawings and specific embodiments

[0027] Referring to Figures 1-8 the utility model discloses a safety device of water turbine guide vane mechanism, is applied to water turbine volute 1, the safety device of water turbine guide vane mechanism still includes the water turbine top cover 2 of being fixed on water turbine volute 1, and the top surface of water turbine top cover 2 is arranged with several protection mechanisms 21 around the center axis of water turbine volute 1 equidistantly, the center of protection mechanism 21 is provided with rotatable mounting shaft 4, and the top of water turbine top cover 2 is provided with several electric push rods 3 for driving mounting shaft 4 to rotate around the center axis equidistantly hinged;

[0028] the inside of protection mechanism 21 is slidably installed with the limiting block 23 capable of limiting the rotation angle of mounting shaft 4, and the top of limiting block 23 is hingedly arranged with mounting shaft 4;

[0029] the bottom of mounting shaft 4 is provided with guide vane 41 for adjusting water flow.

[0030] when the output end of electric push rod 3 extends, electric push rod 3 drives mounting shaft 4 to rotate counterclockwise, so that mounting shaft 4 drives guide vane 41 to open the water inlet inside water turbine volute 1, when the output end of electric push rod 3 contracts, electric push rod 3 drives mounting shaft 4 to rotate clockwise, so that mounting shaft 4 drives guide vane 41 to close the water inlet inside water turbine volute 1, thereby controlling the flow and flow rate of water flow into the inside of water turbine volute 1. By slidingly installing limiting block 23 in the inside of protection mechanism 21, the top end of limiting block 23 is hingedly arranged with mounting shaft 4, so that mounting shaft 4 drives limiting block 23 to slide along the inside of protection mechanism 21, so that limiting block 23 limits the rotation angle of mounting shaft 4, to avoid that mounting shaft 4 is bent or broken due to excessive rotation amplitude.

[0031] Referring to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 the utility model discloses a safety device of water turbine guide vane mechanism, is applied to water turbine volute 1, the safety device of water turbine guide vane mechanism still includes the water turbine top cover 2 of being fixed on water turbine volute 1, and the top surface of water turbine top cover 2 is arranged with several protection mechanisms 21 around the center axis of water turbine volute 1 equidistantly, the center of protection mechanism 21 is provided with rotatable mounting shaft 4, and the top of water turbine top cover 2 is provided with several electric push rods 3 for driving mounting shaft 4 to rotate around the center axis equidistantly hinged;

[0032] Two arc-shaped limiting grooves 22 are arranged inside the protection mechanism 21. A limiting block 23 is slidingly arranged inside the arc-shaped limiting groove 22. When the mounting shaft 4 rotates, the mounting shaft 4 drives the limiting block 23 to slide along the arc-shaped limiting groove 22. A buffer spring 24 is arranged inside the arc-shaped limiting groove 22, one end of the buffer spring 24 abuts against one side of the limiting block 23. When the limiting block 23 slides in the arc-shaped limiting groove 22, the limiting block 23 presses the buffer spring 24. Then, the buffer spring 24 generates a reaction force due to the pressing, and pushes the limiting block 23, thereby effectively avoiding the collision between the limiting block 23 and the two ends of the arc-shaped limiting groove 22.

[0033] Referring to Figure 5 , Figure 6 and Figure 8 , a first connecting piece 42 capable of being hinged with the output end of the electric push rod 3 is horizontally arranged on one side of the top end of the mounting shaft 4.

[0034] The first connecting piece 42 is fixedly arranged on the top end of the mounting shaft 4, and then the output end of the electric push rod 3 is hinged with the first connecting piece 42. When the output end of the electric push rod 3 extends or shrinks, the electric push rod 3 drives the mounting shaft 4 to rotate clockwise or counterclockwise through the first connecting piece 42.

[0035] Referring to Figure 5 , Figure 6 and Figure 8 , a second connecting piece 43 capable of being hinged with the limiting block 23 is symmetrically arranged on the bottom of the mounting shaft 4 close to the first connecting piece 42.

[0036] The second connecting piece 43 is fixedly arranged on the mounting shaft 4 below the first connecting piece 42, and the second connecting piece 43 is hinged with the top of the limiting block 23. When the mounting shaft 4 rotates clockwise or counterclockwise, the limiting block 23 limits the rotation angle of the mounting shaft 4 through the second connecting piece 43, so as to avoid the collision of the bottom arranged guide vane 41 due to the too large rotation amplitude of the mounting shaft 4. The damage of the mounting shaft 4 and the guide vane 41 due to the collision is avoided.

[0037] Referring to Figure 4 , Figure 5 and Figure 6 , a ring seat 25 is fixedly arranged at the center of the water turbine top cover 2, a mounting rod 26 for mounting the electric push rod 3 is arranged on the top of the ring seat 25, and an output end of the electric push rod 3 is provided with a mounting frame 31 capable of being hinged with the first connecting piece 42.

[0038] The electric push rod 3 is hingedly mounted on the mounting rod 26. An installation frame 31 capable of being hinged with the first connecting piece 42 is arranged at the output end of the electric push rod 3. When the output end of the electric push rod 3 extends or shrinks, the electric push rod 3 can rotate axially along the mounting rod 26. At the same time, the electric push rod 3 drives the first connecting piece 42 to move through the installation frame 31. Then the first connecting piece 42 drives the mounting shaft 4 to rotate clockwise or counterclockwise. So that the electric push rod 3 can flexibly control the rotating direction and angle of the mounting shaft 4.

[0039] Referring to Figure 3 and Figure 5 , the inside of the water turbine spiral case 1 is provided with a rotatable runner 5. The center of the top of the runner 5 is vertically provided with an output shaft 51 capable of extending into the inside of the water turbine spiral case 1. The output shaft 51 is movably mounted at the center of the ring seat 25.

[0040] When the water flow drives the runner 5 to rotate, the runner 5 converts the kinetic energy of the water flow into potential energy. At the same time, the runner 5 drives the output shaft 51 to rotate axially inside the ring seat 25, so that the output shaft 51 drives the externally connected generator to work.

[0041] Referring to Figure 5 , the center of the protection mechanism 21 is provided with a mounting hole 27 for mounting the mounting shaft 4. The inside of the mounting hole 27 is provided with a bearing sleeve 28 for avoiding wear when the mounting shaft 4 rotates.

[0042] By arranging the bearing sleeve 28 inside the mounting hole 27. Then install the mounting shaft 4 inside the bearing sleeve 28, avoid the mounting shaft 4 from rubbing with the inner wall of the mounting hole 27 when rotating, causing damage. Thus increasing the service life of the mounting shaft 4.

[0043] The utility model discloses a water turbine guide mechanism's safety protection device, including the water turbine volute 1, the water turbine top cover 2, the ring seat 25, the electric push rod 3, the first connecting piece 42, the installation shaft 4, the second connecting piece 43 and the protection mechanism 21, the water turbine volute 1 is fixedly connected with the water turbine top cover 2, the ring seat 25 is fixedly connected with the water turbine top cover 2, the electric push rod 3 is hingedly connected with the ring seat 25, the first connecting piece 42 is connected with the electric push rod 3, the installation shaft 4 is connected with the first connecting piece 42, the second connecting piece 43 is connected with the installation shaft 4 and the protection mechanism 21 is connected with the installation shaft 4.

[0044] The above embodiments only express one or several embodiments of the utility model, and the description is more specific and detailed, but it can not be understood as the limitation of the scope of the utility model. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.

Claims

1. A safety protection device for a water guide mechanism of a water turbine, applied to the turbine casing (1), characterized in that, The safety protection device of the water turbine guide mechanism also includes a water turbine top cover (2) fixed on the water turbine volute (1). The upper surface of the water turbine top cover (2) is provided with a number of protective mechanisms (21) arranged equidistantly around the central axis of the water turbine volute (1). A rotatable mounting shaft (4) is provided at the center of the protective mechanism (21). A number of electric push rods (3) for driving the mounting shaft (4) to rotate are hinged equidistantly around the central axis on the top of the water turbine top cover (2). The protective mechanism (21) has a limiting block (23) that can limit the rotation angle of the mounting shaft (4) inside. The top of the limiting block (23) is hinged to the mounting shaft (4). The bottom of the mounting shaft (4) is provided with guide vanes (41) for adjusting the water flow.

2. The safety protection device for the water guide mechanism of a water turbine according to claim 1, characterized in that, The protective mechanism (21) has two arc-shaped limiting grooves (22) symmetrically arranged on the side near the mounting shaft (4) for installing the limiting block (23). The two arc-shaped limiting grooves (22) are respectively provided with two sets of buffer springs (24) for pushing the limiting block (23) to reset.

3. The safety protection device for the water guide mechanism of a water turbine according to claim 1, characterized in that, A first connector (42) capable of being hinged to the output end of the electric push rod (3) is horizontally provided on one side of the top end of the mounting shaft (4).

4. A safety protection device for a water turbine guide vane mechanism according to claim 3, characterized in that, A second connector (43) that can be hinged to the limiting block (23) is symmetrically provided on the mounting shaft (4) near the bottom of the first connector (42).

5. A safety protection device for a water turbine guide vane mechanism according to claim 1, characterized in that, A ring seat (25) is fixed at the center of the turbine top cover (2), and a mounting rod (26) for installing an electric push rod (3) is provided on the top of the ring seat (25); The output end of the electric push rod (3) is provided with a mounting bracket (31) that can be hinged to the first connector (42).

6. A safety protection device for a water turbine guide vane mechanism according to claim 5, characterized in that, The turbine casing (1) is equipped with a rotating wheel (5) inside. An output shaft (51) that can extend out of the turbine casing (1) is vertically arranged at the center of the top of the wheel (5). The output shaft (51) is movably installed at the center of the ring seat (25).

7. A safety protection device for a water turbine guide vane mechanism according to claim 1, characterized in that, The protective mechanism (21) has a through mounting hole (27) at its center. The mounting shaft (4) is rotatably mounted inside the mounting hole (27). The mounting hole (27) is provided with a bearing sleeve (28) to prevent wear when the mounting shaft (4) rotates.

Images