Overspeed protection device for large rotary mechanical equipment
Through the airflow and friction braking components of the dual braking mechanism, the problem of inertial rotation damage after interruption of power by large-scale rotary mechanical overspeed protection is solved, and buffer braking is achieved, protecting the rotation shaft and improving the service life of the equipment.
Patent Information
- Application Number
- CN202422585282.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-10-25
AI Technical Summary
In the overspeed protection of existing large rotating machinery, the inertia rotation after power failure causes shaft damage, reducing equipment life and may cause economic losses.
A dual braking mechanism is adopted, including an airflow brake assembly and a friction brake assembly, which consumes mechanical energy through airflow resistance and friction to achieve buffer braking to avoid hard contact damage.
Effectively protect the rotating mechanical rotating shaft, improve equipment life, avoid hard braking damage, and reduce maintenance and economic losses.
Smart Images
Figure CN223089848U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical overspeed protection equipment, in particular to an overspeed protection device for large rotating mechanical equipment. Background Technique
[0002] With the rapid development of industry and technology, in the process of industrial production, large machinery is needed for production operations. During the use of large machinery, in order to adapt to the use environment, it needs to have multiple functions such as lifting and rotating. During the use of these large machinery, protection devices are required to supervise and protect their operations. For example, an overspeed protection device is needed to protect large rotating machinery during rotation.
[0003] Currently, during the overspeed protection of some large machinery, the power-off method is adopted for overspeed protection. This method has the beneficial effects of being able to immediately stop the rotation of the equipment, preventing further damage to the equipment due to overspeed, eliminating potential safety hazards that may be caused by equipment overspeed, and protecting the safety of personnel. However, after the power-off, the rotating shaft on the machinery will still rotate at a high speed for a period of time under the action of inertia. During this period, the damage to the rotating shaft will be aggravated, the service life of the large rotating machinery will be reduced, and in severe cases, irreversible damage will be caused to the rotating shaft on the large machinery, and then repairs or replacements are required, resulting in certain economic losses. Content of the Utility Model
[0004] Aiming at the problems in the background technique, an overspeed protection device for large rotating mechanical equipment is proposed.
[0005] The utility model proposes an overspeed protection device for large rotating mechanical equipment, which includes a transmission shaft. A connection disk is installed on the transmission shaft, and the connection disk is used to connect with the rotating shaft for rotation on the large rotating mechanical equipment. A double braking mechanism is arranged on the transmission shaft. The double braking mechanism is composed of an air flow braking component and a friction braking component. The air flow braking component uses a spiral disk and a resistance frame to block the air flow to form a resistance opposite to the transmission shaft, and the mechanical energy of the transmission shaft is consumed through the resistance to complete braking. The friction braking component uses friction plates as braking elements, and the mechanical energy of the transmission shaft is consumed by generating frictional force when the friction plates are in contact with the transmission shaft to complete the braking of the transmission shaft.
[0006] Preferably, the air flow braking component is composed of a buffer cylinder, a spiral disk and a resistance frame. The buffer cylinder is sleeved on the transmission shaft, and the buffer cylinder is connected to the transmission shaft by a sealed bearing. The spiral disk is fixedly sleeved on the transmission shaft, and the resistance frame is installed on the spiral disk. An air inlet pipe is arranged at the top of the buffer cylinder for air to enter the buffer cylinder, and an air outlet pipe is arranged at the bottom of the buffer cylinder for the discharge of air. The air flow flows along the spiral disk in the buffer cylinder, and two ventilation slots are opened on the resistance frame for the normal flow of air.
[0007] Preferably, the two ventilation slots on the same resistance frame are arranged in a staggered manner, so that the air flow flows in an S shape when passing through the resistance frame, increasing the resistance.
[0008] Preferably, the friction braking assembly is composed of a mounting shell, a three-way pipe, a pressure regulating cylinder, a piston, a pushing member, a friction plate and a pressure spring. The mounting shell is arranged below the buffer cylinder, the transmission shaft penetrates through the mounting shell and is movably connected with the mounting shell. The three-way pipe is arranged on the buffer cylinder and communicated with the air outlet pipe. The pressure regulating cylinder is arranged on the mounting shell and communicated with one end of the three-way pipe. The piston is slidably mounted in the pressure regulating cylinder, the pushing member is slidably mounted in the pressure regulating cylinder, one end of the pushing member extends outside the pressure regulating cylinder and is slidably connected with the pressure regulating cylinder. The friction plate is arranged on the mounting shell and connected with the pushing member, and the pressure spring is sleeved on the pushing member.
[0009] Preferably, a one-way valve is arranged on the pressure regulating cylinder, and the installation position of the one-way valve is at the connection between the pressure regulating cylinder and the three-way pipe, which is used to prevent the air flow in the pressure regulating cylinder from flowing back into the three-way pipe.
[0010] Preferably, a pressure discharge pipe is installed on the pressure regulating cylinder, the bottom end of the pressure discharge pipe extends outside the mounting shell, and an electric pressure valve is arranged on the pressure discharge pipe, which is used to control the pressure in the pressure regulating cylinder.
[0011] Compared with the prior art, the utility model has the following beneficial technical effects:
[0012] By connecting the transmission shaft and the connecting disc to the rotating shaft on the large rotating machinery, a split design is realized. At this time, the rotating shaft can be braked by braking the transmission shaft, and the damage caused by friction braking during the braking process acts on the transmission shaft, avoiding damage to the rotating shaft, and achieving the effect of protecting the rotating shaft of the large rotating machinery;
[0013] By arranging the spiral disc and the resistance frame, resistance can be formed by blocking the flowing air flow. The mechanical energy of the rotating shaft on the large rotating machinery is consumed through this resistance to achieve the braking effect. By adopting the pushing friction plate to contact the transmission shaft to generate frictional force, the mechanical energy of the rotating shaft on the large rotating machinery is consumed through this frictional force to achieve the braking effect. In summary, the protection against overspeed of the large rotating machinery is completed through the double braking mechanism, which can improve the protection effect on the large machinery; and first, braking is performed through the air flow resistance, which can form a braking buffer and avoid hard braking, thereby improving the protection effect on the rotating shaft of the large rotating machinery. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a structural schematic diagram of the utility model;
[0015] Figure 2 is a structural schematic diagram of the friction braking assembly in the utility model;
[0016] Figure 3 Structural schematic diagram of the transmission shaft, spiral disk and resistance frame in the present utility model;
[0017] Figure 4 Cross-sectional structural schematic diagram of the present utility model.
[0018] Reference numerals: 1, transmission shaft; 2, connection disk; 3, buffer cylinder; 4, spiral disk; 5, resistance frame; 6, ventilation through groove; 7, intake pipe; 8, three-way pipe; 9, installation shell; 10, pressure regulating cylinder; 11, one-way valve; 12, pressure discharge pipe; 13, pushing member; 14, friction plate; 15, piston; 16, pressure spring. Specific embodiments
[0019] As Figures 1 - 4 shown, a high-speed protection device for large rotating mechanical equipment proposed by the present utility model includes: a transmission shaft 1, a connection disk 2 and a double braking mechanism.
[0020] As Figure 1 shown, the connection disk 2 is installed on the transmission shaft 1 and is used to connect with the rotating shaft for rotation on large rotating mechanical equipment. A plurality of installation holes are provided on the connection disk 2, and bolts can be used as connecting members to connect the connection disk 2 with the rotating shaft, so that the transmission shaft 1 and the rotating shaft reach a synchronous rotation state.
[0021] As Figures 1 - 4 shown, the double braking mechanism is composed of an air flow braking component and a friction braking component. The air flow braking component uses a spiral disk 4 and a resistance frame 5 to block the air flow to form a resistance opposite to the transmission shaft 1, and consumes the mechanical energy of the transmission shaft 1 through the resistance to complete braking. The friction braking component uses a friction plate 14 as a braking element, and generates frictional force by contacting the friction plate 14 with the transmission shaft 1 to consume the mechanical energy of the transmission shaft 1 and complete the braking of the transmission shaft 1.
[0022] As Figure 1 、 Figure 3 and Figure 4 shown, the air flow braking component is composed of a buffer cylinder 3, a spiral disk 4 and a resistance frame 5. The buffer cylinder 3 is sleeved on the transmission shaft 1, and the buffer cylinder 3 is connected with the transmission shaft 1 by a sealed bearing. The spiral disk 4 is fixedly sleeved on the transmission shaft 1, and the resistance frame 5 is installed on the spiral disk 4. An intake pipe 7 is provided at the top of the buffer cylinder 3 for air flow to enter the buffer cylinder 3, and an exhaust pipe is provided at the bottom of the buffer cylinder 3 for air flow to be discharged. The air flow flows along the spiral disk 4 in the buffer cylinder 3. Two ventilation through grooves 6 are provided on the resistance frame 5 for the normal flow of air. The two ventilation through grooves 6 on the same resistance frame 5 are arranged in a staggered manner, so that the air flow flows in an S shape when flowing through the resistance frame 5, increasing the resistance.
[0023] As Figure 2 andFigure 4 As shown, the friction braking assembly is composed of a mounting shell 9, a three-way pipe 8, a pressure regulating cylinder 10, a piston 15, a pushing member 13, a friction plate 14 and a pressure spring 16. The mounting shell 9 is arranged below the buffer cylinder 3. The transmission shaft 1 passes through the mounting shell 9 and is movably connected to the mounting shell 9. The three-way pipe 8 is arranged on the buffer cylinder 3 and is communicated with the air outlet pipe. The pressure regulating cylinder 10 is arranged on the mounting shell 9. The pressure regulating cylinder 10 is communicated with one end of the three-way pipe 8. The piston 15 is slidably mounted in the pressure regulating cylinder 10. The pushing member 13 is slidably mounted in the pressure regulating cylinder 10. One end of the pushing member 13 extends outside the pressure regulating cylinder 10 and is slidably connected to the pressure regulating cylinder 10. The friction plate 14 is arranged on the mounting shell 9. The friction plate 14 is connected to the pushing member 13. The pressure spring 16 is sleeved on the pushing member 13. By adopting the pressure spring 16, the position of the friction plate 14 can be indirectly limited when the friction plate 14 is not in use, so as to avoid contact between the friction plate 14 and the transmission shaft 1. A one-way valve 11 is arranged on the pressure regulating cylinder 10. The installation position of the one-way valve 11 is at the connection of the pressure regulating cylinder 10 and the three-way pipe 8, which is used to prevent the air flow in the pressure regulating cylinder 10 from flowing back into the three-way pipe 8. A pressure relief pipe 12 is mounted on the pressure regulating cylinder 10. The bottom end of the pressure relief pipe 12 extends outside the mounting shell 9. An electric pressure valve is arranged on the pressure relief pipe 12, which is used to control the pressure in the pressure regulating cylinder 10. Both the one-way valve 11 and the electric pressure valve are composed of existing technologies.
[0024] In this embodiment, the large rotating mechanical equipment includes but is not limited to hydro-generating units.
[0025] In this embodiment, when the large rotating machinery is working, the rotation of the machinery needs to be completed through the rotation of the rotating shaft. When using the protection device in this embodiment, the transmission shaft 1 needs to be connected to the transmission shaft on the large rotating machinery through the connecting disk 2. And when the rotating shaft of the large rotating machinery rotates, the transmission shaft 1 rotates synchronously with it;
[0026] During specific use, the air inlet pipe 7 on the buffer cylinder 3 needs to be connected to an external air pump supply device for injecting air flow into the buffer cylinder 3. When the large rotating machinery loses power due to overspeed, air flow is simultaneously input into the buffer cylinder 3 through the air pump supply device. After the air flow enters the buffer cylinder 3, it will flow downward along the spiral disk 4. During this process, the air flow will collide with the resistance frame 5, thereby forming a resistance in the opposite direction of the rotation direction of the transmission shaft 1. Through this resistance, the rotational mechanical energy of the transmission shaft 1 can be reduced, thus achieving a buffer braking effect. Subsequently, the air flow flows into the pressure regulating cylinder 10 through the three-way pipe 8, increasing the pressure in the pressure regulating cylinder 10 and pushing the piston 15 and the pushing member 13 to move, thereby pushing the friction plate 14 into contact with the rotating shaft 1. The rotational mechanical energy of the transmission shaft 1 is reduced by the frictional force generated by the contact between the friction plate 14 and the surface of the transmission shaft 1, thereby achieving the effect of braking the transmission shaft 1. When the pressure in the pressure regulating cylinder 10 is too high, pressure can be released through the pressure discharge pipe 12 and the electric pressure regulating valve on the pressure discharge pipe 12 to ensure that the pressure in the pressure regulating cylinder 10 is within a safe and appropriate range. During the process of braking the transmission shaft 1 through the above method, it is equivalent to braking the rotating shaft on the large rotating machinery, thereby achieving an overspeed protection effect.
[0027] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art to which the present invention pertains.
Claims
1. An overspeed protection device for large rotating mechanical equipment, comprising: Drive shaft (1), a connecting disc (2) is installed on the drive shaft (1), and the connecting disc (2) is used to connect with the rotating shaft for rotation on a large rotating mechanical equipment. It is characterized in that: A double braking mechanism is arranged on the drive shaft (1), and the double braking mechanism is composed of an air flow braking component and a friction braking component; The air flow braking component uses a spiral disc (4) and a resistance frame (5) to block the air flow to form a resistance opposite to the drive shaft (1), and consumes the mechanical energy of the drive shaft (1) through the resistance to complete braking; The friction braking component uses a friction plate (14) as a braking element, and generates frictional force by contacting the friction plate (14) with the drive shaft (1) to consume the mechanical energy of the drive shaft (1) and complete the braking of the drive shaft (1).
2. The overspeed protection device for a large rotating mechanical equipment according to claim 1, characterized in that, The air flow braking component is composed of a buffer cylinder (3), a spiral disc (4) and a resistance frame (5). The buffer cylinder (3) is sleeved on the drive shaft (1), and the buffer cylinder (3) is connected with the drive shaft (1) by a sealed bearing. The spiral disc (4) is fixedly sleeved on the drive shaft (1), and the resistance frame (5) is installed on the spiral disc (4). An air inlet pipe (7) is arranged at the top of the buffer cylinder (3) for air flow to enter the buffer cylinder (3), and an air outlet pipe is arranged at the bottom of the buffer cylinder (3) for air flow to be discharged. The air flow flows along the spiral disc (4) in the buffer cylinder (3), and two ventilation slots (6) are opened on the resistance frame (5) for the normal flow of the air flow.
3. The overspeed protection device for a large rotating mechanical equipment according to claim 2, characterized in that, The two ventilation slots (6) on the same resistance frame (5) are arranged in a staggered manner, so that the air flow flows in an S shape when flowing through the resistance frame (5), increasing the resistance.
4. The overspeed protection device for a large rotating mechanical equipment according to claim 1, characterized in that, The friction braking component is composed of a mounting shell (9), a three-way pipe (8), a pressure regulating cylinder (10), a piston (15), a pushing member (13), a friction plate (14) and a pressure spring (16). The mounting shell (9) is arranged below the buffer cylinder (3), the drive shaft (1) passes through the mounting shell (9) and is movably connected with the mounting shell (9). The three-way pipe (8) is arranged on the buffer cylinder (3) and is communicated with the air outlet pipe. The pressure regulating cylinder (10) is arranged on the mounting shell (9), and the pressure regulating cylinder (10) is communicated with one end of the three-way pipe (8). The piston (15) is slidably installed in the pressure regulating cylinder (10), the pushing member (13) is slidably installed in the pressure regulating cylinder (10), one end of the pushing member (13) extends out of the pressure regulating cylinder (10) and is slidably connected with the pressure regulating cylinder (10). The friction plate (14) is arranged on the mounting shell (9), the friction plate (14) is connected with the pushing member (13), and the pressure spring (16) is sleeved on the pushing member (13).
5. The overspeed protection device for a large rotating mechanical equipment according to claim 4, characterized in that, A one-way valve (11) is arranged on the pressure regulating cylinder (10), and the installation position of the one-way valve (11) is at the connection between the pressure regulating cylinder (10) and the three-way pipe (8) to prevent the air flow in the pressure regulating cylinder (10) from flowing back into the three-way pipe (8).
6. The overspeed protection device for a large rotating mechanical equipment according to claim 4, characterized in that, A pressure discharge pipe (12) is installed on the pressure regulating cylinder (10), the bottom end of the pressure discharge pipe (12) extends out of the mounting shell (9), and an electric pressure valve is arranged on the pressure discharge pipe (12) to control the pressure in the pressure regulating cylinder (10).