A guide vane connecting rod device for a small water turbine
By introducing an eccentric structure and a locking device into the guide vane connecting rod device of a small water turbine, the problems of complex and high cost of the guide vane adjustment mechanism are solved, and convenient synchronous control and overload protection of the guide vane are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING WATER TURBINE WORKS
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-14
AI Technical Summary
The existing guide vane adjustment mechanism for small water turbines is complex in structure, difficult to operate, and costly, making it difficult to achieve synchronous opening and closing of the guide vanes.
The guide vane connecting rod device with an eccentric structure uses an eccentric pin and an eccentric hole to adjust the relative position of the connecting rod. Combined with a locking device, it can increase or decrease the distance between the control ring and the guide vane arm. The position of the eccentric pin is controlled by a locking nut, which simplifies the connection mechanism and provides a shear pin for overload protection.
It simplifies the guide vane adjustment operation, reduces manufacturing costs, enables convenient adjustment and synchronous control of the guide vanes, and provides automatic protection under overload conditions.
Smart Images
Figure CN224496625U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water turbine guide vane installation technology, specifically to a guide vane connecting rod device for a small water turbine. Background Technology
[0002] During the assembly of the guide vane mechanism in a small hydro-generator set, errors in machining and installation may prevent all guide vanes from opening and closing synchronously. To ensure the synchronicity of all guide vane adjustments, an adjustment mechanism must be installed. The traditional linkage adjustment structure consists of two nuts with forked heads and a connecting screw with left and right threads.
[0003] Chinese patent document CN219911007U discloses a guide vane connecting rod device for a water turbine, including two connecting rods, a sleeve, a first nut and a second nut, a first lug and a second lug, a connecting pin, a pressure plate, a limiting plate, and countersunk screws. The sleeve is fitted onto the two connecting rods, connecting and adjusting their lengths. The first nut and the second nut are respectively fitted onto the connecting rods on both sides of the sleeve, fixing the sleeve. The first lug and the second lug are respectively located at the ends of the two connecting rods away from the sleeve. The first lug and the second lug have axially penetrating channels. The connecting pin is sleeved in the channel, and the pressure plate is set at both ends of the connecting pin. Screw holes are provided at both ends of the connecting pin and the center of the pressure plate. Fixing screws are installed in the screw holes to fix the connecting pin and the pressure plate. The limiting plate is set at the lower end of the first and second lugs and is fixed by countersunk screws. The upper pressure plate and the limiting plate fix the axial position of the first and second lugs. A guide vane arm is connected between the limiting plate of the first lug and the lower pressure plate. A control ring is connected between the limiting plate of the second lug and the lower pressure plate.
[0004] In existing technologies, the total length of the connecting rod is changed by rotating the sleeve, thereby controlling the opening and closing position of the guide vane. This type of adjustment mechanism has a complex structure, is difficult to operate, and has high processing and manufacturing costs. Utility Model Content
[0005] To address the technical problem of conveniently controlling the opening and closing of guide vanes in small water turbines, this utility model provides a guide vane connecting rod device for small water turbines, including a guide vane arm, a control ring, and a connecting rod. One end of the connecting rod is connected to the guide vane arm via a pin. The connecting rod is characterized in that it is connected to the control ring via an eccentric structure, and the eccentric structure is provided with a locking device for controlling tightness.
[0006] Preferably, the eccentric structure uses an eccentric pin, and the connecting rod is provided with an eccentric hole, the size of which is larger than the diameter of the eccentric pin.
[0007] Preferably, the portion connecting the eccentric pin and the control ring is concentric, and the portion connecting the eccentric pin and the connecting rod is eccentric.
[0008] Preferably, the locking device is a locking nut, which is threaded onto the eccentric pin, and the locking nut controls the position of the eccentric pin on the connecting rod by a knob.
[0009] For overload protection, the connecting rod is connected to the guide vane arm via a shear pin. The shear pin is the weakest link; when the torque exceeds a set threshold, it will be sheared first, forcibly interrupting power transmission.
[0010] For ease of installation and fixation, the shear pin connecting to the end of the guide vane arm and the eccentric pin connecting to the end of the control ring are both secured with screws.
[0011] To prevent loosening, retaining rings are provided between the screw and the guide vane arm, and between the screw and the control ring.
[0012] This utility model has the following beneficial effects:
[0013] 1. This utility model adjusts the relative position of the connecting rod in the control ring by using eccentric pins and eccentric holes, thereby increasing or decreasing the distance between the control ring and the guide vane arm. This simplifies the connection mechanism, facilitates installation and maintenance, and has low manufacturing costs. It can easily adjust the fully open and closed positions of the water guiding mechanism, and the size of the distance is determined by the eccentricity. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of an embodiment of the guide vane connecting rod device for a small water turbine according to the present invention;
[0015] Figure 2 for Figure 1 Top view. Detailed Implementation
[0016] The following detailed description illustrates the specific implementation method:
[0017] The reference numerals in the accompanying drawings include: 1. Guide vane arm; 2. Control ring; 3. Connecting rod; 4. Eccentric pin; 5. Eccentric hole; 6. Locking nut; 7. Shear pin; 8. Eccentricity; 9. Bushing; 10. Screw; 11. Retaining ring.
[0018] Example 1
[0019] like Figure 1 and 2 As shown, a guide vane connecting rod device for a small water turbine includes a guide vane arm 1, a control ring 2, and a connecting rod 3. One end of the connecting rod 3 is connected to the guide vane arm 1 via a pin, and the connecting rod 3 is connected to the control ring 2 via an eccentric structure. The eccentric structure is provided with a locking device responsible for locking the length.
[0020] The eccentric structure employs an eccentric pin 4, and the connecting rod 3 is provided with an eccentric hole 5. The length of the connecting rod 3 is adjusted by the eccentric pin 4. The size of the eccentric hole 5 is larger than the diameter of the eccentric pin 4, resulting in a certain eccentricity 8, the specific value of which depends on the requirements.
[0021] The connection between the eccentric pin 4 and the control ring 2 is concentric, and the connection between the eccentric pin 4 and the connecting rod 3 is eccentric.
[0022] The locking device is a locking nut 6, which is threaded onto the eccentric pin 4. The locking nut 6 controls the position of the eccentric pin 4 on the connecting rod 3 by a knob.
[0023] The connecting rod 3 is connected to the guide vane arm 1 via a shear pin 7, and a bushing 9 is provided between the shear pin 7 and the connecting rod 3. The shear pin 7 is the weakest link, and when the torque exceeds a set threshold, it will be sheared first, forcibly interrupting the power transmission.
[0024] The shear pin 7, which connects to the end of the guide vane arm 1, and the eccentric pin 4, which connects to the end of the control ring 2, are both fastened with screws 10.
[0025] A retaining ring 11 is provided between the screw 10 and the guide vane arm 1, and between the screw 10 and the control ring 2.
[0026] In use, the eccentric pin 4 is locked onto the connecting rod 3 with the locking nut 6, so that the connecting rod 3 is driven by the control ring 2. When it is necessary to adjust the distance between the guide vane arm 1 and the control ring 2, without extending the connecting rod 3, the position of the eccentric pin 4 in the eccentric hole 5 is adjusted by loosening the locking nut 6, thereby increasing the distance between the guide vane arm 1 and the control ring 2, and then the locking nut 6 is used to lock and fix it.
[0027] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A guide vane connecting rod device for a small water turbine, comprising a guide vane arm, a control ring, and a connecting rod, wherein one end of the connecting rod is connected to the guide vane arm via a pin, characterized in that, The connecting rod is connected to the control ring via an eccentric structure. The eccentric structure is equipped with a locking device for controlling tightness. The eccentric structure uses an eccentric pin, and the connecting rod has an eccentric hole. The size of the eccentric hole is larger than the diameter of the eccentric pin. The connection between the eccentric pin and the control ring is concentric, and the connection between the eccentric pin and the connecting rod is eccentric. The locking device is a locking nut, which is threaded onto the eccentric pin. The locking nut controls the position of the eccentric pin on the connecting rod via a knob.
2. The guide vane connecting rod device for a small water turbine according to claim 1, characterized in that: The connecting rod is connected to the guide vane arm via a shear pin.
3. The guide vane connecting rod device for a small water turbine according to claim 2, characterized in that: The shear pin connecting to the end of the guide vane arm and the eccentric pin connecting to the end of the control ring are both secured with screws.
4. The guide vane connecting rod device for a small water turbine according to claim 3, characterized in that: A retaining ring is provided between the screw and the guide vane arm, and between the screw and the control ring.