Gas turbine protection method based on safety pin

Abstract

The invention discloses a gas turbine protection method based on a safety pin, and relates to the technical field of gas turbine overload protection. Comprising the steps that a safety pin is manufactured based on the critical torque of the gas turbine, and a hollow groove and a fastening groove which communicate with each other are formed in the safety pin; blind holes are formed in the circumference of the gas turbine main shaft; an assembly cavity is formed in the axial direction of the output shaft, and through holes are formed in the circumference of the output shaft; one end of the gas turbine main shaft is inserted into the assembly cavity, and the position of the through hole corresponds to the position of the blind hole; after the safety pin is placed in the blind hole and the through hole, the fastening screw penetrates through the fastening groove and is screwed on the main shaft of the gas turbine; during operation, if the gas turbine is not overloaded, the safety pins on the circumference ensure reliable connection of the main shaft and the output shaft of the gas turbine; if the gas turbine is overloaded, the safety pin can be timely disconnected to protect the gas turbine main shaft. The protection method is realized by installing the safety pin between the main shaft of the gas turbine and the actual output shaft. When the gas turbine is overloaded, the safety pin can be quickly disconnected, so that the main shaft of the gas turbine is effectively protected.

Description

Technical Field

[0001] The invention relates to the technical field of fuel engine overload protection, and in particular to a fuel engine protection method based on a safety pin. Background Art

[0002] Gas turbine overload, that is, the gas turbine is operated in a state exceeding its design or rated load, which will bring many hazards. For example, the pressure and temperature of each component will increase significantly, thereby accelerating the wear and aging of the parts and shortening their service life. Due to overload operation, the rotating parts may be damaged due to high temperature, overload and other factors, such as bearing wear, blade breakage, etc. Overload will also increase the axial thrust, causing the thrust pad temperature to rise, and in severe cases, the thrust pad may be burned. In addition, the gas turbine requires more fuel to generate the same power under overload conditions, which will lead to a decrease in combustion efficiency and fuel efficiency. Overload operation will also deteriorate the performance of the speed control system, such as an increase in the speed change rate and delay rate, thereby affecting the overall performance of the gas turbine. In addition, when the gas turbine is overloaded, the flue gas emissions will also increase accordingly, which will have an adverse impact on the environment.

[0003] In the prior art, gas turbines generally rely on data from various sensors to determine whether they are overloaded and decide whether to shut down based on this. However, there is uncertainty in relying solely on sensors for judgment, because if the instrument is damaged, the overload situation may not be detected in time, causing damage to the gas turbine. Therefore, it is necessary to develop a mechanical-based safety protection method to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a fuel engine protection method based on a safety pin, wherein a safety pin is installed between a fuel engine main shaft and an actual output shaft, and when the fuel engine is overloaded, the safety pin is disconnected in time to protect the fuel engine.

[0005] To achieve the above purpose, the technical solution of the present application is: a combustion engine protection method based on a safety pin, comprising:

[0006] The safety pin is manufactured based on the critical torque of the combustion engine, and a connected hollow groove and a fastening groove are opened on the safety pin;

[0007] A blind hole is opened on the circumference of the main shaft of the gas turbine;

[0008] An assembly cavity is provided in the axial direction of the output shaft, and a through hole is provided in the circumference thereof;

[0009] Insert one end of the main shaft of the engine into the assembly cavity, and make the position of the through hole correspond to the position of the blind hole;

[0010] After the safety pin is placed in the blind hole and the through hole, the fastening screw passes through the fastening groove and is tightened on the main shaft of the engine;

[0011] During operation, if the engine is not overloaded, the safety pins on the circumference ensure the 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.

[0012] In one of the embodiments, within the critical torque range of the engine, the engine main shaft drives the output shaft to rotate via the safety pin, and the safety pin plays a role in transmitting torque.

[0013] In one of the embodiments, a sealing groove is also formed on the output shaft, the diameter of the sealing groove is larger than the diameter of the through hole and the two are connected.

[0014] In one of the embodiments, after the fastening screw passes through the fastening groove and is tightened on the main shaft of the combustion engine, the O-ring is installed in the sealing groove and is pressed by the sealing end cover.

[0015] In one of the embodiments, 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.

[0016] In one of the embodiments, a reduced diameter groove is provided on the safety pin, and the safety pin is disconnected from the reduced diameter groove.

[0017] In one of the embodiments, a circle of diameter-expanding grooves is processed on the inner wall of the hollow groove, and the diameter-expanding groove is arranged opposite to the diameter-reducing groove.

[0018] In one embodiment, the reduced diameter groove is located in the gap between the main shaft and the output shaft of the combustion engine.

[0019] In one of the embodiments, the material and design size of the safety pin are selected according to the critical torque of the combustion engine.

[0020] In one embodiment, two safety pins are provided and symmetrically installed on the main shaft and output shaft of the engine.

[0021] The present invention adopts the above technical solution, and can achieve the following technical effects: The protection method of the present invention is realized by installing a safety pin between the main shaft of the engine and the actual output shaft. When the engine is overloaded, the safety pin can be quickly disconnected, thereby effectively protecting the main shaft of the engine. The structure involved in this method is not only simple and easy to manufacture, but also very convenient in installation and disassembly.

[0022] Within the maximum torque range that the engine can withstand, the safety pins arranged on the circumference ensure the reliable connection between the engine main shaft and the output shaft. In addition, a sliding bearing is arranged between the engine main shaft and the output shaft, so that when the safety pin is cut off, the two shafts can avoid damage due to friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0024] Figure 1 It is a schematic diagram of the assembly structure of the safety pin;

[0025] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0026] Explanation of the serial numbers in the figure: 1. Engine main shaft; 2. Output shaft; 3. Sliding bearing; 4. Safety pin; 5. Fastening screw; 6. Sealing end cover; 7. O-ring. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can 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 can be directly connected to the other element or indirectly connected to the other element.

[0029] 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 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.

[0030] In the description of the present 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] See also Figure 1-2 This embodiment provides a combustion engine protection method based on a safety pin, comprising:

[0033] S1. The material and design size of the safety pin are selected according to the critical torque of the engine; the safety pin is provided with a connected hollow groove and a fastening groove;

[0034] S2. A blind hole is opened on the circumference of the main shaft of the engine;

[0035] S3. An assembly cavity is provided in the axial direction of the output shaft, a through hole and a sealing groove are provided on the circumference, the diameter of the sealing groove is larger than the diameter of the through hole 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;

[0036] S4. Insert one end of the main shaft of the engine into the assembly cavity, and make the through hole position correspond to the blind hole position;

[0037] S5. After placing the safety pin into the blind hole and the through hole, the fastening screw passes through the fastening groove and is tightened on the main shaft of the engine, then the O-ring is installed in the sealing groove and pressed with the sealing end cover.

[0038] S6. During operation, if the engine is not overloaded, the safety pins on the circumference ensure the reliable connection between the engine main shaft and the output shaft; if the engine is overloaded, the safety pins will be disconnected in time to protect the engine main shaft; use a wrench to remove the fastening screws and take out the safety pins in the blind hole.

[0039] In this embodiment, within the critical torque range of the engine, the engine main shaft drives the output shaft to rotate via the safety pin, and the safety pin plays a role in transmitting torque.

[0040] As a preferred implementation provided in this embodiment, a diameter reduction groove is provided on the safety pin, the diameter reduction groove is located in the gap between the main shaft and the output shaft of the combustion engine, and the safety pin is disconnected from the diameter reduction groove. A circle of diameter expansion groove is processed on the inner wall of the hollow groove, and the diameter expansion groove is arranged opposite to the diameter reduction groove.

[0041] As a preferred implementation scheme provided in this embodiment, two safety pins are provided and symmetrically installed on the main shaft and output shaft of the engine, which can not only ensure the connection strength between the two, but also disconnect in time when overloaded to protect the main shaft of the engine.

[0042] 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 it. 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 combustion engine protection method based on a safety pin, characterized in that: include: The safety pin is manufactured based on the critical torque of the combustion engine, and a connected hollow groove and a fastening groove are opened on the safety pin; A blind hole is opened on the circumference of the main shaft of the gas turbine; An assembly cavity is provided in the axial direction of the output shaft, and a through hole is provided in the circumference thereof; Insert one end of the main shaft of the engine into the assembly cavity, and make the position of the through hole correspond to the position of the blind hole; After the safety pin is placed in the blind hole and the through hole, the fastening screw passes through the fastening groove and is tightened on the main shaft of the engine; During operation, if the engine is not overloaded, the safety pins on the circumference ensure the 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.

2. The combustion engine protection method based on safety pin according to claim 1 is 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.

3. The combustion engine protection method based on safety pin according to claim 1 is 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.

4. The combustion engine protection method based on safety pin according to claim 3 is characterized in that: After the fastening screw passes through the fastening groove and is tightened on the main shaft of the engine, the O-ring is installed in the sealing groove and pressed with the sealing end cover.

5. The combustion engine protection method based on safety pin according to claim 1 is 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.

6. The combustion engine protection method based on safety pin according to claim 1 is characterized in that: A diameter reduction groove is provided on the safety pin, and the safety pin is disconnected from the diameter reduction groove.

7. The combustion engine protection method based on safety pin according to claim 6 is characterized in that: A circle of diameter expansion groove is processed on the inner wall of the hollow groove, and the diameter expansion groove is arranged opposite to the diameter reduction groove.

8. The combustion engine protection method based on safety pin according to claim 6 is characterized in that: The reduced diameter groove is located in the gap between the main shaft and the output shaft of the combustion engine.

9. The combustion engine protection method based on safety pin according to claim 1 is characterized in that: The material and design size of the safety pin are selected according to the critical torque of the engine.

10. The combustion engine protection method based on safety pin according to claim 1 is 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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