Shearing structure for overload shutdown of gas turbine

Abstract

The utility model discloses a shearing structure for overload shutdown of a gas turbine, and relates to the technical field of overload protection of gas turbines. Comprising a safety pin installed between a main shaft and an output shaft of the gas turbine, a hollow groove and a fastening groove which are communicated are formed in the safety pin, and a circle of expanding groove is machined in the inner wall of the hollow groove; a reducing groove is formed in the outer part of the safety pin and is opposite to the expanding groove; when the gas turbine runs in an overload mode, the safety pin is disconnected between the reducing groove and the expanding groove, and the main shaft of the gas turbine is protected. The safety pin is installed between the gas turbine main shaft and the actual output shaft, when the gas turbine is overloaded, the safety pin can be rapidly disconnected, and therefore the gas turbine main shaft is effectively protected. The diameter of the middle broken part of the safety pin is small, the diameters of the two sides of the safety pin are large, and the safety pin is simple in structure, easy to manufacture and convenient to mount and dismount.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbine overload protection, in particular to a shear structure used for overload shutdown of a gas turbine. Background Art

[0002] Gas turbine overloading, that is, operating a gas turbine beyond its design or rated load, can pose a variety of hazards. For example, the pressure and temperature experienced by various components can increase significantly, accelerating wear and aging, shortening their service life. Overloaded operation can damage rotating components due to high temperatures and overload, such as bearing wear and blade breakage. Overloading also increases axial thrust, causing thrust pad temperatures to rise, and in severe cases, can burn out the thrust pads. Furthermore, overloaded gas turbines require more fuel to produce the same power, resulting in reduced combustion efficiency and lower fuel efficiency. Overloaded operation can also degrade the performance of the speed control system, such as increasing the speed variation rate and retardation rate, thereby affecting the overall performance of the gas turbine. Furthermore, when a gas turbine is overloaded, flue gas emissions also increase, adversely affecting the environment.

[0003] In existing technology, gas turbines typically rely on data from various sensors to determine whether they are overloaded and, based on this data, to decide whether to shut down. However, relying solely on sensors for this determination presents uncertainties. If the instrumentation is damaged, overload conditions may not be detected in time, potentially causing damage to the gas turbine. Therefore, it is necessary to develop a mechanical safety protection structure to address this issue. Utility Model Content

[0004] The purpose of the utility model is to provide a shear structure for overload shutdown of a gas turbine, which is installed between the main shaft of the gas turbine and the actual output shaft. When the gas turbine is overloaded, its safety pin is disconnected in time to protect the gas turbine.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application is: a shear structure for overload shutdown of a gas turbine, comprising a safety pin installed between the main shaft and the output shaft of the gas turbine, a hollow groove and a fastening groove being connected inside the safety pin, and a circle of expanding groove being processed on the inner wall of the hollow groove; a reducing groove being provided outside the safety pin, and the reducing groove and the expanding groove being arranged opposite to each other; when the gas turbine is overloaded, the safety pin is disconnected from between the reducing groove and the expanding groove to protect the main shaft of the gas turbine.

[0006] In one embodiment, a blind hole is opened on the circumference of the main shaft of the combustion engine for installing a safety pin.

[0007] In one embodiment, an assembly cavity is formed in the axial direction of the output shaft and a through hole is formed in the circumference thereof. One end of the main shaft of the combustion engine is inserted into the assembly cavity. The through hole is used to install a safety pin, and the position of the through hole corresponds to the position of the blind hole.

[0008] In one embodiment, the fastening screw passes through the fastening slot and is tightened on the main shaft of the combustion engine.

[0009] In one embodiment, within the critical torque range of the combustion engine, the combustion engine main shaft drives the output shaft to rotate through the safety pin, and the safety pin plays a role in transmitting torque.

[0010] In one embodiment, a sealing groove is further provided on the output shaft. The diameter of the sealing groove is larger than the diameter of the through hole and the two are connected.

[0011] In one embodiment, the sealing end cover is installed in the sealing groove via an O-ring.

[0012] In one embodiment, a sliding bearing is installed on the inner wall of the assembly cavity of the output shaft so as to form an integral structure with the output shaft.

[0013] In one embodiment, the reduced diameter groove is located in the gap between the main shaft and the output shaft of the combustion engine.

[0014] In one embodiment, two safety pins are provided and symmetrically mounted on the main shaft and output shaft of the combustion engine.

[0015] By adopting the above technical solution, the present invention achieves the following technical effects: a safety pin is installed between the main shaft of the combustion engine and the actual output shaft. When the combustion engine is overloaded, the safety pin can be quickly disconnected, thereby effectively protecting the combustion engine main shaft. The safety pin has a smaller diameter at the disconnection point in the middle and larger diameters on both sides, resulting in a simple structure, easy manufacturing, and convenient installation and removal.

[0016] Shear pins placed around the circumference ensure a secure connection between the main and output shafts within the maximum torque range the engine can withstand. Furthermore, a sliding bearing is placed between the main and output shafts to prevent frictional damage to the two shafts when the shear pins are disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 Schematic diagram of the assembly structure of the safety pin;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Explanation of the serial numbers in the figure: 1. Turbine main shaft; 2. Output shaft; 3. Sliding bearing; 4. Safety pin; 5. Fastening screw; 6. Sealing end cover; 7. O-ring. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] See also Figure 1-2This embodiment provides a shear structure for overload shutdown of a gas turbine, comprising: a safety pin installed between the main shaft and the output shaft of the gas turbine, a hollow groove and a fastening groove being connected inside the safety pin, a circle of enlarged diameter groove being processed on the inner wall of the hollow groove, a fastening screw passing through the fastening groove and tightened on the main shaft of the gas turbine, and when the safety pin is disconnected, it can be removed with a wrench; a reduced diameter groove is opened on the outside of the safety pin, and the reduced diameter groove is arranged opposite to the expanded diameter groove; when the gas turbine is overloaded, the safety pin is disconnected between the reduced diameter groove and the expanded diameter groove to protect the main shaft of the gas turbine.

[0027] In this embodiment, within the critical torque range of the combustion engine, the combustion engine main shaft drives the output shaft to rotate via the safety pin, and the safety pin plays a role in transmitting torque.

[0028] In this embodiment, a blind hole is opened on the circumference of the main shaft of the engine for installing a safety pin; an assembly cavity is opened in the axial direction of the output shaft, and a through hole and a sealing groove are opened on the circumference, and a sliding bearing is installed on the inner wall of the assembly cavity to make it an integrated structure; one end of the main shaft of the engine is inserted into the assembly cavity, and the through hole is used to install the safety pin, and the position of the through hole corresponds to the position of the blind hole; the diameter of the sealing groove is larger than the diameter of the through hole and the two are connected; the sealing end cover is installed in the sealing groove through an O-ring.

[0029] In this embodiment, two safety pins are provided and symmetrically installed on the main shaft and output shaft of the engine, which can ensure the connection strength between the two and can be disconnected in time when overloaded to protect the main shaft of the engine.

[0030] This embodiment also provides a method for using the shear structure, including:

[0031] S1. The shear pin material and design dimensions are selected based on the critical torque of the engine. The shear pin has a connecting hollow groove and a fastening groove.

[0032] S2. A blind hole is opened on the circumference of the main shaft of the gas turbine;

[0033] S3. The output shaft has an axial assembly cavity, a through hole and a sealing groove on the circumference, the sealing groove having a diameter greater than the through hole diameter and the two are connected; a sliding bearing is installed on the inner wall of the assembly cavity of the output shaft so that it becomes an integral structure with the output shaft;

[0034] S4. Insert one end of the engine main shaft into the assembly cavity, and align the through hole position with the blind hole position;

[0035] S5. After placing the safety pin into the blind hole and the through hole, tighten the fastening screw through the fastening groove onto the main shaft of the engine, install the O-ring in the sealing groove, and press it with the sealing end cover.

[0036] S6. During operation, if the engine is not overloaded, the safety pins on the circumference ensure a reliable connection between the engine main shaft and the output shaft; if the engine is overloaded, the safety pins will disconnect in time to protect the engine main shaft.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A shear structure for overload shutdown of a gas turbine, characterized in that: The invention comprises a safety pin installed between the main shaft and the output shaft of the combustion engine, wherein a hollow groove and a fastening groove are connected inside the safety pin, and a circle of diameter expansion groove is processed on the inner wall of the hollow groove; a diameter reduction groove is opened outside the safety pin, and the diameter reduction groove and the diameter expansion groove are arranged opposite to each other; when the combustion engine is overloaded, the safety pin is disconnected between the diameter reduction groove and the diameter expansion groove to protect the main shaft of the combustion engine.

2. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: A blind hole is opened on the circumference of the main shaft of the gas turbine for installing a safety pin.

3. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: An assembly cavity is opened in the axial direction of the output shaft and a through hole is opened on the circumference. One end of the main shaft of the combustion engine is inserted into the assembly cavity. The through hole is used to install a safety pin, and the position of the through hole corresponds to the position of the blind hole.

4. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: The fastening screw passes through the fastening groove and is tightened on the main shaft of the combustion engine.

5. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: In the critical torque range of the engine, the engine main shaft drives the output shaft to rotate through the safety pin, and the safety pin plays a role in transmitting torque.

6. The shear structure for overload shutdown of a gas turbine according to claim 3, characterized in that: A sealing groove is also provided on the output shaft. The diameter of the sealing groove is larger than the diameter of the through hole and the two are connected.

7. The shear structure for overload shutdown of a gas turbine according to claim 6, characterized in that: The sealing end cover is installed in the sealing groove through the O-ring.

8. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: A sliding bearing is installed on the inner wall of the assembly cavity of the output shaft so as to form an integrated structure with the output shaft.

9. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: The reduced diameter groove is located in the gap between the main shaft and the output shaft of the combustion engine.

10. The shear structure for overload shutdown of a gas turbine according to claim 1, characterized in that: Two safety pins are provided and symmetrically mounted on the main shaft and the output shaft of the combustion engine.

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