Axial-flow type unit transmission connecting rod structure suitable for AGC operation

Abstract

The utility model discloses an axial-flow type unit transmission connecting rod structure suitable for AGC operation. The axial-flow type unit transmission connecting rod structure is composed of a piston rod, an operation frame, a lug handle, a connecting rod pin, a connecting rod, a rotating arm and blades. The connecting rod pin can be applied to the design of blade transmission mechanisms of large and medium-sized axial flow units, a pin hole screw is omitted, the connecting rod pin and the connecting rod are in interference fit to prevent the connecting rod pin from rotating, and the phenomenon that the connecting rod pin cannot rotate due to high local stress at the pin hole screw can be effectively avoided. And meanwhile, fatigue damage caused by increase of operation times due to AGC operation is superposed, so that the fatigue life of the connecting rod is greatly prolonged, and the fatigue damage is prevented.

Description

Technical Field

[0001] The utility model relates to the field of water turbines, in particular to an axial flow unit transmission connecting rod structure suitable for AGC operation. Background Art

[0002] The connecting rod is an important component of the transmission mechanism of the turbine unit of a hydropower station and plays a vital role in the normal operation of the entire unit. According to the requirements of the power grid, my country's large and medium-sized axial-flow propeller units all adopt the AGC operation mode to play the role of peak regulation and frequency regulation. However, under the AGC operation mode, the operation of the unit becomes extremely frequent. The traditional transmission connecting plate structure cannot adapt to the frequent operation under the AGC operation mode, resulting in a significant reduction in the fatigue life of the connecting plate structure, and then fatigue damage occurs, endangering the safe operation of the unit. Therefore, it is urgent to invent a transmission connecting rod structure for an axial-flow turbine unit that can adapt to AGC operation. Utility Model Content

[0003] The purpose of the utility model is to provide a new axial flow unit transmission connecting rod structure that can adapt to the AGC operating mode and avoid fatigue damage. The technical solution of the utility model is: it consists of a connecting rod, a connecting rod pin, an ear handle, a rotating arm, an operating frame, a piston rod, and a blade. The operating frame is connected to the ear handle, the ear handle is connected to the connecting rod pin, the connecting rod pin is connected to the connecting rod, and the connecting rod pin at the other end is connected to the rotating arm to form a complete transmission system.

[0004] In the above-mentioned axial flow unit transmission connecting rod structure adapted to AGC operation, the piston rod is connected to the piston, and the piston rod and the operating frame are fastened together by bolts, thereby realizing the up and down sliding of the operating frame controlled by oil pressure.

[0005] In the above-mentioned axial flow unit transmission connecting rod structure adapted to AGC operation, the operating frame and the ear handle are fastened together by a nut, and a pre-tightening force is applied to the ear handle to form a whole.

[0006] In the transmission connecting rod structure of the axial flow unit adapted to AGC operation, the ear handle is connected to the connecting rod pin, the connecting rod pin is connected to the connecting rod, and an interference fit is adopted between the two; the connecting rod pin is connected to the rotating arm.

[0007] In the transmission connecting rod structure of the axial flow unit adapted to AGC operation, the rotating arm and the blade are connected by a key to transmit torque, thereby realizing the opening and closing of the blade.

[0008] The beneficial effects of the utility model are:

[0009] In existing structures, the pinhole screw generates large local stresses during transmission due to the presence of torque. Furthermore, the increased number of operations caused by AGC operation can easily lead to fatigue failure, endangering the safe operation of the unit. The utility model provides an axial-flow unit transmission connecting rod structure suitable for AGC operation, eliminating the pinhole screw and adopting an interference fit between the connecting rod pin and the connecting rod to prevent the connecting rod pin from rotating. This can effectively avoid the high local stress at the pinhole screw and the fatigue failure caused by the increased number of operations caused by AGC operation, thereby greatly improving the fatigue life of the connecting rod and preventing fatigue failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a cross-sectional view of the blade transmission mechanism;

[0011] Figure 2 It is a top view of the conventional connecting rod;

[0012] Figure 3 It is a top view of the utility model;

[0013] Figure 4 It is a front view of a conventional scheme of a connecting rod;

[0014] Figure 5 It is a front view of the utility model.

[0015] In the figure, 1, piston rod; 2, operating frame; 3, ear handle; 4, connecting rod; 5, connecting rod pin; 6, rotating arm; 7, blade; 8, pin hole screw. DETAILED DESCRIPTION

[0016] To make the technical solutions and beneficial effects of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the following embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without any creative effort are all within the scope of protection of the present invention.

[0017] like Figure 1 As shown in the figure, the transmission connecting rod structure of the axial flow turbine unit that can adapt to the operation of AGC includes a piston rod 1, an operating frame 2, an ear handle 3, a connecting rod 4, a connecting rod pin 5, a rotating arm 6, and a blade 7. The piston rod 1 is connected to the piston, the piston rod 1 is connected to the operating frame 2, the operating frame 2 is connected to the ear handle 3, the ear handle 3 is connected to the connecting rod pin 5, the connecting rod pin 5 is connected to the connecting rod 4, the connecting rod pin 5 is connected to the rotating arm 6, and the rotating arm 6 is connected to the blade 7, forming a complete transmission mechanism.

[0018] Working principle: During normal operation of the connecting rod, the piston rod and the entire operating frame are driven up and down by oil pressure control. When the operating frame moves upward, the ear handle is pushed upward, and then the connecting rod is pushed upward. The other end of the connecting rod can control the rotation of the rotating arm to open the blade. When the operating frame moves downward, the ear handle is pulled downward, and then the connecting rod is pushed downward. The other end of the connecting rod can control the rotation of the rotating arm to close the blade, thereby achieving the purpose of opening and closing the blade.

[0019] Compared with the existing technology, the advantages of the present invention are: the pin hole screw 8 is eliminated, and the connecting rod pin and the connecting rod adopt an interference fit to prevent the rotation of the connecting rod pin, which can effectively avoid fatigue damage caused by high local stress at the pin hole screw 8 and the increased number of operations caused by AGC operation, thereby greatly improving the fatigue life of the connecting rod and preventing fatigue damage.

[0020] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. An axial flow unit transmission connecting rod structure adapted to AGC operation, characterized by: It consists of a piston rod (1), an operating frame (2), an ear handle (3), a connecting rod (4), a connecting rod pin (5), a rotating arm (6), and a blade (7). The piston rod (1) is connected to the piston, and the piston rod (1) is fixed to the operating frame (2) by bolts. The operating frame (2) can slide up and down. The operating frame (2) is fixed to the ear handle (3) by nuts. The ear handle (3) is connected to the connecting rod pin (5), and the connecting rod pin (5) is connected to the connecting rod (4). Interference fit is adopted between the two. The connecting rod pin (5) is connected to the rotating arm (6), and the rotating arm (6) is connected to the blade (7) by a key.

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