Mechanical accelerator limiting monitoring device with protection structure
By designing mechanical throttle limit monitoring devices with a protective structure in the emergency diesel generator crew of the nuclear power plant, monitoring and restricting the largest throttle of the diesel generator set, it solves the problem of equipment damage caused by overload operations, improves equipment reliability and nuclear power plant Safety.
Patent Information
- Application Number
- CN202310929881.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-27
- Publication Date
- 2025-01-28
AI Technical Summary
When the emergency diesel generator set of the existing nuclear power plant is overloaded, it cannot effectively prevent damage to the diesel engine cylinder liner and bearing, resulting in a reduction in operating life and reliability, threatening the safety of the nuclear power plant.
Design a mechanical throttle limit monitoring device with a protective structure, including cylinder, stent components, and horizontal oil adjustment rods. Through the limited top rod and built -in limited position sensor, monitor and restrict the largest throttle of diesel generator sets to avoid overloading run.
Effectively avoided the damage of equipment and components caused by overload operations of emergency diesel generators, improved the reliable operation of diesel generators and the safety of nuclear power plants, while reducing maintenance and replacement costs.
Smart Images
Figure CN119373598A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of nuclear power emergency diesel generators, in particular to a mechanical throttle limit monitoring device with a protective structure. Background Art
[0002] The emergency diesel generator set is an important component of the emergency system equipment of a nuclear power plant. Since nuclear power plants have very high requirements for the safety and reliability of the system, whether the emergency diesel generator set can be started reliably and run normally under load according to the loading procedure will directly affect the safety of the entire nuclear power plant. The mechanical throttle limit of the diesel engine is an important guarantee for protecting the reliable operation of the diesel generator set. According to the feedback from the owners of domestic nuclear power plants in operation, during the process of the unit being connected to the grid, the active power continued to increase, exceeding the rated power by 1.4 times, causing damage to the diesel engine cylinder liner and bearing;
[0003] According to the current situation of overload protection of diesel generator sets in nuclear power plants, which are mainly set up with overvoltage and overcurrent protection, when the overvoltage and overcurrent protection of the unit actually occur, the unit load has far exceeded the unit's 110% rated output power, directly causing damage to a series of components such as the cylinder liner and bearings of the emergency diesel generator set. In more serious cases, the moving parts of the emergency diesel generator set will be further damaged, greatly reducing the operating life and reliability of the unit, thereby threatening the safety of the nuclear power plant.
[0004] To this end, we propose a mechanical throttle limit monitoring device with a protective structure. Summary of the invention
[0005] The object of the present invention is to provide a mechanical throttle limit monitoring device with a protective structure to solve the problems raised in the above background technology.
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical throttle limit monitoring device with a protective structure, comprising a cylinder, a bracket assembly and a transverse oil adjusting rod, the bottom end of the cylinder is fixedly connected to the bracket assembly, the output end of the cylinder is fixedly connected to the brake push rod, the top end of the bracket assembly is installed with a limit push rod, one side of the bracket assembly is provided with a transverse oil adjusting rod, the outer wall of the transverse oil adjusting rod is installed with a fuel rack position rod, the top end of the bracket assembly away from the limit push rod is fixedly connected with a zero position screw, a bolt is installed at the edge of the bracket assembly, and the zero position screw corresponds to the throttle zero position.
[0007] Preferably, the limit push rod has a built-in limit position sensor.
[0008] Preferably, a first air inlet hole and a second air inlet pipe are respectively installed on one side of the cylinder.
[0009] Preferably, an arc block is fixedly connected to the middle portion of the fuel rack position rod.
[0010] Preferably, the limit push rod is used to avoid overload conditions during the operation of the unit as a single unit or in grid connection, to timely and effectively limit the continuous increase of the unit power, and to avoid damage to the cylinder liner and bearing of the diesel generator set.
[0011] Preferably, the limit push rod has a built-in limit position sensor to monitor whether the fuel rack position rod touches the maximum mechanical throttle limit position.
[0012] Preferably, when the cylinder receives a diesel generator set shutdown protection instruction, high-pressure air enters the cylinder, pushes the limit push rod to pull the lateral oil adjustment rod to zero position, and cuts off the oil supply to the prime mover to protect the diesel generator set from shutdown.
[0013] Preferably, the brake push rod limits the maximum amount of oil entering the combustion cylinder of the diesel generator set during the startup phase to ensure that the startup speed is not too high or too rough, and no black smoke is emitted, thereby ensuring the stability of the unit startup.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. By setting the maximum mechanical throttle limit device, the emergency diesel generator set is prevented from overloading and causing damage to the unit equipment and components, providing a guarantee for the reliable operation of the diesel generator set, thereby improving the safety of the entire nuclear power plant system.
[0016] 2. A limit position sensor is built into the limit push rod to monitor whether the fuel rack position rod touches the maximum mechanical throttle limit position, effectively monitoring and protecting the maximum load of the unit.
[0017] 3. By setting the starting maximum throttle limit push rod, the starting speed of the unit will not be too high or too rough, avoiding the black smoke phenomenon during the starting process and further improving the starting stability of the unit.
[0018] 4. The maximum mechanical throttle limit device realizes the timely overload protection of the emergency diesel generator set, and the device is simple and easy to operate. If this problem is not solved, an overload condition will occur during the operation of the unit alone or in grid connection. As the grid load increases, the power of the unit continues to increase, which eventually leads to damage to the cylinder liner, bearings and moving parts of the unit due to over-high load operation, greatly reducing the reliability of the diesel generator set and reducing the safety of nuclear power plant operation. In addition, the maintenance and replacement costs of the diesel generator set are also increased accordingly. By setting the overload mechanical throttle limit monitoring and protection device provided in the present invention, the above situation can be effectively avoided, thereby further ensuring the safe and reliable operation of the nuclear power plant and effectively saving the operation and maintenance costs of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is one of the overall structural schematic diagrams of the present invention;
[0020] Figure 2 This is the second schematic diagram of the overall structure of the present invention;
[0021] Figure 3 This is the third schematic diagram of the overall structure of the present invention.
[0022] In the figure: 1. Cylinder; 2. Bracket assembly; 3. Horizontal oil adjustment rod; 4. Fuel rack position rod; 5. Brake push rod; 6. Limit push rod; 7. Zero position screw; 8. Arc block; 11. First air inlet hole; 12. Second air inlet pipe. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] See also Figure 1-3 As shown, a mechanical throttle limit monitoring device with a protective structure includes a cylinder 1, a bracket assembly 2 and a transverse oil regulating rod 3, the bottom end of the cylinder 1 is fixedly connected to the bracket assembly 2, the output end of the cylinder 1 is fixedly connected to the brake push rod 5, the top of the bracket assembly 2 is installed with a limit push rod 6, one side of the bracket assembly 2 is provided with a transverse oil regulating rod 3, the outer wall of the transverse oil regulating rod 3 is installed with a fuel rack position rod 4, the top of the bracket assembly 2 is fixedly connected to the end away from the limit push rod 6 with a zero position screw 7, the limit push rod 6 has a built-in limit position sensor, the first air inlet hole 11 and the second air inlet pipe 12 are respectively installed on one side of the cylinder 1, the middle part of the fuel rack position rod 4 is fixedly connected with an arc block 8, the edge of the bracket assembly 2 is installed with a bolt, and the zero position screw 7 corresponds to the throttle zero position.
[0025] It should be noted that: as the unit is loaded during operation, the oil supply servo drives the lateral oil adjustment rod 3 to link the fuel rack position rod 4 to rotate in the direction of the throttle. When the unit runs to the maximum load and continues to rise, the fuel rack position rod 4 will touch the limit push rod 6 to limit the throttle from further increasing. At this time, the limit push rod 6 effectively limits the maximum throttle of the unit (52mm), that is, limits the maximum output load. This avoids the damage of the unit equipment and components caused by overload operation of the emergency diesel generator set, provides guarantee for the reliable operation of the diesel generator set, and then improves the safety of the entire nuclear power plant system.
[0026] It should be noted that: when receiving the unit stop signal, the unit control peripheral system provides 7 bar control air from the second intake pipe 12 to supply air to cylinder 1. Under the action of the control air pressure, the internal piston of cylinder 1 is pushed, so that the piston of cylinder 1 drives the brake push rod 5 to push the fuel rack position rod 4 in the direction of reducing the throttle, and drives the lateral oil adjustment rod 3 to rotate in the direction of reducing the oil until the throttle is at zero position, and the diesel generator set stops without fuel supply.
[0027] It should be noted that when the diesel engine is started, the unit control peripheral system provides 7 bar control air from the second air intake pipe 12 to supply air to the cylinder 1. Under the pressure of the compressed control air, the piston inside the cylinder 1 is pushed, so that the brake push rod 5 extends to the preset position (the position is determined to be <52mm according to the startup performance debugging, and it is 50mm in this example). At this time, the cylinder plays the role of limiting the maximum throttle of the startup. By limiting the startup throttle to a reasonable range, the maximum amount of oil entering the combustion cylinder of the diesel generator set during the startup phase is limited to ensure that the startup speed will not be too high and too rough, and there will be no black smoke, so as to ensure the stability of the unit startup.
[0028] Working principle:
[0029] After the bench test in the workshop, the throttle position at full load (110% rated) needs to be determined, and it is sealed after the on-site delivery test, and the length of the throttle limit rod is fixed (the maximum throttle limit scale in this example is 52mm), which completes the setting of the maximum output limit load. During the on-site operation, no manual operation is required, and the mechanism will operate automatically. As the unit is loaded, the oil supply servo drives the lateral oil adjustment rod 3 to link the fuel rack position rod 4 to rotate in the direction of the throttle. When the unit runs to the maximum load and continues to rise, the fuel rack position rod 4 will touch the limit push rod 6, limiting the throttle from further increasing. At this time, the limit push rod 6 effectively limits the maximum throttle of the unit (52mm), that is, limits the maximum output load, avoids the emergency diesel generator set from overloading and causing damage to the unit equipment and components, provides protection for the reliable operation of the diesel generator set, and then improves the safety of the entire nuclear power plant system. When receiving the unit shutdown signal, the unit control peripheral system provides 7bar control air from the second air intake pipe 12 to the cylinder 1. Under the pressure of the control air, the internal piston of the cylinder 1 is pushed, so that the piston of the cylinder 1 drives the brake push rod 5 to push the fuel rack position rod 4 in the direction of reducing the throttle, and drives the lateral oil adjustment rod 3 to rotate in the direction of reducing the oil until the throttle is at zero position. The diesel generator set stops without oil supply. When the diesel engine is started, the unit control peripheral system provides 7bar control air from the second intake pipe 12 to supply air to the cylinder 1. Under the pressure of the compressed control air, the internal piston of the cylinder 1 is pushed to extend the brake push rod 5 to a preset position (the position is determined to be <52mm according to the starting performance debugging, and it is 50mm in this example). At this time, the cylinder plays a role in limiting the maximum throttle of the start. By limiting the starting throttle within a reasonable range, the maximum amount of oil entering the combustion cylinder of the diesel generator set during the starting stage is limited to ensure that the starting speed will not be too high or too rough, and there will be no black smoke, so as to ensure the stability of the unit start-up.
[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A mechanical throttle limit monitoring device with a protective structure, characterized in that: include: A cylinder (1), a bracket assembly (2) and a transverse oil adjustment rod (3), wherein the bottom end of the cylinder (1) is fixedly connected to the bracket assembly (2), the output end of the cylinder (1) is fixedly connected to a brake push rod (5), the top end of the bracket assembly (2) is installed with a limit push rod (6), one side of the bracket assembly (2) is provided with a transverse oil adjustment rod (3), the outer wall of the transverse oil adjustment rod (3) is installed with a fuel rack position rod (4), and the top end of the bracket assembly (2) away from the limit push rod (6) is fixedly connected with a zero screw (7).
2. A mechanical throttle limit monitoring device with a protective structure according to claim 1, characterized in that: The limit push rod (6) has a built-in limit position sensor.
3. The mechanical throttle limit monitoring device with a protective structure according to claim 1, characterized in that: A first air intake hole (11) and a second air intake pipe (12) are respectively installed on one side of the cylinder (1).
4. The mechanical throttle limit monitoring device with a protective structure according to claim 1, characterized in that: An arc block (8) is fixedly connected to the middle portion of the fuel rack position rod (4).
5. The mechanical throttle limit monitoring device with a protective structure according to claim 1, characterized in that: Bolts are installed at the edge of the bracket assembly (2).
6. The mechanical throttle limit monitoring device with a protective structure according to claim 1, characterized in that: The zero position screw (7) corresponds to the throttle zero position.