Guide vane servomotor locking device

Abstract

The utility model discloses a guide vane servomotor locking device which comprises a locking cylinder with a rear end cover and a locking pin arranged in the locking cylinder and provided with a piston, one end of the locking pin extends out of the locking cylinder, an inner cavity of the locking cylinder is divided into a movable cavity and a hydraulic cavity, the diameter of the movable cavity is smaller than that of the hydraulic cavity, the piston is located in the hydraulic cavity, and the hydraulic cavity is communicated with a hydraulic system through a guide pipe. A sealing ring I is arranged between the piston and the inner wall of the hydraulic cavity and fixed to the piston, a sealing ring II is arranged between the locking pin and the inner wall of the hydraulic cavity and fixed to the locking pin, the sealing ring II slides on the inner wall of the movable cavity, the sealing ring I and the sealing ring II are made of polyurethane, and the cross section of the sealing ring I and the cross section of the sealing ring II are D-shaped. Compared with the prior art, the utility model has the advantages of simple structure and better performance stability.

Description

Technical Field

[0001] The utility model belongs to a water turbine component, in particular to a guide vane servo locking device. Background Art

[0002] The guide vane servo is an important component of the turbine control system. Its working principle is based on hydraulic transmission. By controlling the opening and closing of individual guide vanes, it adjusts the flow and power of the turbine, thereby achieving precise control of the turbine's operating status.

[0003] The guide vane servo locking device is installed on the guide vane servo. A locking pin is provided in the locking cylinder. The relative position of the locking pin and the locking cylinder is hydraulically controlled. When the guide vane is fully closed, the locking pin is put into use and inserted into the locking hole on the control ring. The locking pin ensures the reliable locking of the guide vane and prevents misoperation. At present, during the actual use of the guide vane servo locking device, the locking pin moves repeatedly in the locking cylinder for a long time. The O-ring rubber seal between the locking pin and the locking cylinder is easily twisted and deformed, which may cause oil leakage at the least. In severe cases, it may cause the entire locking device to fail and have poor performance stability. Utility Model Content

[0004] The purpose of the utility model is to overcome the problem of poor performance stability of the existing guide vane servo locking device and to provide a guide vane servo locking device with a simplified structure and good performance stability.

[0005] The utility model solves its technical problems by adopting the following technical solutions: a guide vane servo locking device, comprising a locking cylinder with a rear end cover and a locking pin with a piston placed in the locking cylinder, one end of the locking pin extending out of the locking cylinder, the inner cavity of the locking cylinder being divided into an active cavity and a hydraulic cavity, the diameter of the active cavity being smaller than that of the hydraulic cavity, the piston being located in the hydraulic cavity, the hydraulic cavity being connected to the hydraulic system through a conduit, a sealing ring I being provided between the piston and the inner wall of the hydraulic cavity, the sealing ring I being fixed on the piston, a sealing ring II being provided between the locking pin and the inner wall of the hydraulic cavity, the sealing ring II being fixed on the locking pin, the sealing ring II sliding on the inner wall of the active cavity, the sealing ring I and the sealing ring II being made of polyurethane, and the cross section thereof being "D" shaped.

[0006] Optionally, deformation grooves are provided on the inner walls of the sealing ring I and the sealing ring II along their circumferences.

[0007] Optionally, positioning grooves are provided on the outer walls of the piston and the locking pin along their circumferences, and the sealing ring I and the sealing ring II are positioned on the piston and the locking pin respectively through the positioning grooves.

[0008] Optionally, the cross section of the positioning groove is square.

[0009] The usage and principle of the utility model are as follows: the oil inlet or oil return operation is performed through the hydraulic system, so that the locking pin is driven by the piston to reciprocate in the locking cylinder, and one end of the locking pin is combined and separated with the locking hole on the control ring. The sealing rings I and II on the locking pin and the piston are in contact with the inner wall of the locking cylinder to cause friction and extrusion. Since the sealing rings I and II are made of polyurethane, their cross-section is "D"-shaped, so that the sealing rings I and II have strong resistance to torsional deformation, the performance and stability of the entire locking device are strong, and certain adjustments have been made to the interior of the locking cylinder, and the structure of the entire locking device is more streamlined.

[0010] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention has a simple structure and good performance stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0012] The components described in the accompanying drawings are marked as follows: locking cylinder 1, piston 2, locking pin 3, movable chamber 4, hydraulic chamber 5, sealing ring I 6, sealing ring II 7, deformation groove 8, positioning groove 9. DETAILED DESCRIPTION

[0013] Example 1, below combined Figure 1 To further illustrate the present invention, the guide vane relay locking device includes a locking cylinder 1 with a rear end cover and a locking pin 3 with a piston 2 placed in the locking cylinder. The piston and the locking pin are integrally formed, and one end of the locking pin extends out of the locking cylinder. The inner cavity of the locking cylinder is divided into an active cavity 4 and a hydraulic cavity 5. The diameter of the active cavity is smaller than that of the hydraulic cavity. The piston is located in the hydraulic cavity. The piston separates the hydraulic cavity into an oil inlet cavity and an oil return cavity. The oil inlet cavity and the oil return cavity are connected to the hydraulic system through a conduit. A sealing ring I 6 is provided between the piston and the inner wall of the hydraulic cavity. The sealing ring I is fixed on the piston. A sealing ring II 7 is provided between the locking pin and the inner wall of the hydraulic cavity. The sealing ring II is fixed on the locking pin. The sealing ring II slides on the inner wall of the active cavity. A positioning groove 9 is provided on the outer wall of the piston and the locking pin along its circumference. The sealing ring I and the sealing ring II are respectively positioned on the piston and the locking pin through the positioning groove. The cross section of the positioning groove is square. The sealing ring I and the sealing ring II are made of polyurethane, and their cross section is "D" shaped.

[0014] In order to improve the deformation ability of the sealing ring I and the sealing ring II, deformation grooves 8 are provided along the circumference of the inner walls of the sealing ring I and the sealing ring II, and the deformation grooves provide sufficient deformation space for the sealing ring I and the sealing ring II.

[0015] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A guide vane servo locking device, comprising a locking cylinder (1) with a rear end cover and a locking pin (3) with a piston (2) placed in the locking cylinder, wherein one end of the locking pin extends out of the locking cylinder, and is characterized in that: The inner cavity of the locking cylinder is divided into an active cavity (4) and a hydraulic cavity (5). The diameter of the active cavity is smaller than that of the hydraulic cavity. The piston is located in the hydraulic cavity. The hydraulic cavity is connected to the hydraulic system through a conduit. A sealing ring I (6) is provided between the piston and the inner wall of the hydraulic cavity. The sealing ring I is fixed on the piston. A sealing ring II (7) is provided between the locking pin and the inner wall of the hydraulic cavity. The sealing ring II is fixed on the locking pin. The sealing ring II slides on the inner wall of the active cavity. The sealing ring I and the sealing ring II are made of polyurethane and have a "D"-shaped cross section.

2. The guide vane servo locking device according to claim 1, characterized in that: The inner walls of the sealing ring I and the sealing ring II are provided with deformation grooves (8) along their circumferences.

3. The guide vane servo locking device according to claim 1, characterized in that: Positioning grooves (9) are provided on the outer walls of the piston and the locking pin along their circumferences, and the sealing ring I and the sealing ring II are positioned on the piston and the locking pin respectively through the positioning grooves.

4. The guide vane servo locking device according to claim 3, characterized in that: The cross section of the positioning groove is square.

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