Overspeed protection device for nuclear power emergency diesel generating set

Abstract

The utility model relates to the field of generator set protection equipment, in particular to an overspeed protection device for a nuclear power emergency diesel generator set. The overspeed protection device for the nuclear power emergency diesel generator set comprises an overspeed protection air bottle, a shunt pipe and a check valve, one side of the overspeed protection air bottle is communicated with a main pipe, a ball valve device is arranged in the middle of the main pipe, one end of the main pipe is communicated with the shunt pipe, one end of the main pipe and one end of the shunt pipe are fixedly connected with a tee joint, and one end of the tee joint is communicated with an output pipe. Check valves are installed in the middle of the main pipe and the middle of the flow dividing pipe, and super-protection electromagnetic valves are installed in the middle of the main pipe and the flow dividing pipe. According to the utility model, the two nuclear-grade super-protection electromagnetic valves which are connected in parallel and the two check valves which are connected in parallel are adopted, and the redundant design ensures that when one element breaks down, the other element can still work normally, so that the protection action can be quickly and reliably realized when the unit is overspeed, and the unit is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator set protection equipment field especially relates to a kind of overspeed protection device for nuclear emergency diesel generator set. BACKGROUND

[0002] Emergency diesel generator set as the key component of nuclear power plant system equipment, plays a vital role, is regarded as the last safety line of nuclear power plant;In the normal operation of nuclear power plant, emergency diesel generator set needs to maintain high reliability and stability, to ensure that it can be started quickly and stably in emergency, to provide necessary cooling, lighting and power support for nuclear reactor, avoid serious accident;

[0003] Nuclear diesel generator set is strictly controlled in the rated range when designing, to ensure the safety and stability of unit;However, in actual operation, due to the drastic change of load, control system failure or other unpredictable factors, the speed of diesel generator set may be abnormally increased, exceed the rated range, enter overspeed state;In this case, if effective measures are not taken in time to protect the unit, it may cause serious damage to the unit, even cause nuclear reactor shutdown, thus threatening the safety of the whole nuclear power plant;

[0004] Existing overspeed protection method mostly depends on electronic control system and mechanical brake device;Although these methods can realize the overspeed protection of unit to some extent, but in extreme conditions, such as control system failure or brake device failure, its protection effect may be greatly discounted.

[0005] Therefore, it is necessary to provide a new overspeed protection device for nuclear emergency diesel generator set to solve the above technical problems. SUMMARY

[0006] To solve the above technical problems, the utility model provides an overspeed protection device for nuclear emergency diesel generator set.

[0007] The overspeed protection device for nuclear emergency diesel generator set provided by the utility model comprises an overspeed protection air bottle, a shunt pipe and a check valve, a main pipe is connected to one side of the overspeed protection air bottle, a ball valve device is arranged in the middle of the main pipe, the shunt pipe is connected to one end of the main pipe, a tee joint is fixedly connected to one end of the main pipe and the shunt pipe, an output pipe is communicated to one end of the tee joint, the check valve is installed in the middle of the main pipe and the shunt pipe, and the overspeed electromagnetic valve is installed in the middle of the main pipe and the shunt pipe.

[0008] Preferably, the ball valve device comprises: a valve core, a connecting shaft, a driving gear, a blocking plate, a connecting rod, a driven gear and a protective cover, the valve core is installed in the middle of the main pipe, the connecting shaft is fixedly connected to the middle of the valve core, the driving gear is fixedly connected to the top end of the connecting shaft which extends out of the main pipe, and the driving source is installed on the top end of the connecting shaft, the blocking plate is rotatably connected inside the main pipe, the connecting rod is fixedly connected to the middle of the blocking plate, the driven gear is fixedly connected to the top end of the connecting rod which extends out of the main pipe, the driving gear is meshingly connected with the driven gear, the protective cover is installed on the outer wall of the main pipe at the valve core, and the driving source is installed on the protective cover.

[0009] Preferably, the overspeed protection air bottle is internally installed with a pressure sensor for monitoring the pressure value in the overspeed protection air bottle in real time and transmitting a monitoring signal to the control system so as to timely issue an alarm when the pressure is abnormal.

[0010] Preferably, the overspeed protection air bottle is externally fixedly connected with a main machine, and the ball valve device, the two check valves and the two overspeed electromagnetic valves are electrically connected with the main machine.

[0011] Preferably, the overspeed protection air bottle is externally installed with an alarm device which is electrically connected with the pressure sensor and the main machine, and when the diesel generating set has an overspeed event and the overspeed protection system is started, the alarm device can issue an audible and visual alarm signal to remind the operator to pay attention and take corresponding measures.

[0012] Preferably, the overspeed protection air bottle is externally fixedly connected with support columns at equal intervals.

[0013] Preferably, the two overspeed electromagnetic valves both have a gas releasing function.

[0014] Compared with the related art, the overspeed protection device for nuclear power emergency diesel generating set has the following beneficial effects:

[0015] High reliability and redundancy design: two parallel nuclear overspeed electromagnetic valves and two parallel check valves are adopted in the device, and such a redundant design ensures that when one element fails, the other element can still work normally, thereby ensuring that the protection action can be quickly and reliably realized when the unit is overspeed, and the unit is prevented from being damaged.

[0016] Fast response and protection performance: the high-pressure air stored in the overspeed protection air bottle can quickly release the high-pressure air to perform emergency braking on the diesel generating set after receiving the overspeed signal, effectively shortens the protection response time and improves the protection efficiency.

[0017] Synchronous control of the blocking plate: the blocking plate in the specially designed ball valve device is connected through the meshing of the driving gear and the driven gear, so that the high-pressure air supply circuit is accurately controlled. In normal operation, the blocking plate remains open, allowing high-pressure air to flow smoothly. When maintenance or emergency shutdown of the air source is required, the driving source drives the driving gear to rotate, which drives the driven gear and the blocking plate to rotate to the closed position, effectively blocking the flow of high-pressure air, increasing the safety and flexibility of the device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure diagram of the overspeed protection device for the nuclear power emergency diesel generator set is provided.

[0019] Figure 2 For Figure 1 A structure diagram of the partial cross-sectional view of the protective cover is shown.

[0020] Figure 3 For Figure 2 A structure diagram of the enlarged view of A is shown.

[0021] Reference numerals in the figure: 1, overspeed protection air bottle; 2, main pipe; 3, ball valve device; 4, shunt pipe; 5, tee; 6, output pipe; 7, check valve; 8, overspeed protection solenoid valve; 9, main machine; 10, support column; 31, valve core; 32, connecting shaft; 33, driving gear; 34, blocking plate; 35, connecting rod; 36, driven gear; 37, protective cover. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and do not limit the utility model.

[0023] The specific implementation of the utility model will be described in detail below in combination with specific examples.

[0024] Please refer to Figures 1-2The utility model provides a kind of nuclear power emergency diesel generating set overspeed protection device, the nuclear power emergency diesel generating set overspeed protection device includes: overspeed protection air bottle 1, shunt pipe 4 and check valve 7, one side of overspeed protection air bottle 1 is connected with main pipe 2, main pipe 2 middle part is equipped with ball valve device 3, one end of main pipe 2 is connected with shunt pipe 4, main pipe 2 and shunt pipe 4 one end are fixedly connected with three ways 5, one end of three ways 5 is connected with output pipe 6, check valve 7 is installed in the middle part of main pipe 2 and shunt pipe 4, check valve 7 is installed in the middle part of main pipe 2 and shunt pipe 4, pressure sensor is installed in overspeed protection air bottle 1, for real-time monitoring the pressure value in overspeed protection air bottle 1, and transmission monitoring signal to control system, to timely send alarm when pressure is abnormal, main body machine 9 is fixedly connected to the outer wall of overspeed protection air bottle 1, ball valve device 3, two the check valve 7 and two the overspeed protection solenoid valve 8 are electrically connected with main body machine 9, alarm device is installed on the outer wall of overspeed protection air bottle 1, alarm device is electrically connected with pressure sensor and main body machine 9, when diesel generating set overspeed event and overspeed protection system start, alarm device can send audible and visual alarm signal, to remind operator and take corresponding countermeasures, support column 10 is fixedly connected with the outer wall of overspeed protection air bottle 1 at equal intervals, and a plurality of support columns 10 provide support force, two the overspeed protection solenoid valve 8 all have the function of air release.

[0025] It should be noted that:

[0026] Please refer to Figures 2-3 Ball valve device 3 includes: valve core 31, connecting shaft 32, driving gear 33, blocking plate 34, connecting rod 35, driven gear 36 and protective cover 37, valve core 31 is installed in the middle part of main pipe 2, connecting shaft 32 is fixedly connected to the middle part of valve core 31, driving gear 33 is fixedly connected to the top end of connecting shaft 32 that extends out of main pipe 2, and a driving source is installed on the top end of connecting shaft 32, blocking plate 34 is rotatably connected inside main pipe 2, connecting rod 35 is fixedly connected to the middle part of blocking plate 34, driven gear 36 is fixedly connected to the top end of connecting rod 35 that extends out of main pipe 2, driving gear 33 is meshingly connected with driven gear 36, protective cover 37 is installed on the outer wall of main pipe 2 at valve core 31, and the driving source is installed on the protective cover 37.

[0027] It should be noted that: when high-speed gas backflows due to the sudden closing of valve core 31, if there is no appropriate blocking 34 or buffering mechanism, valve core 31 may be subjected to a strong impact, resulting in damage or failure. Therefore, the purpose of designing blocking plate 34 is to provide a buffer area in this case, so that the high-speed gas can slow down after hitting the blocking plate, thereby reducing the impact on valve core 31.

[0028] The working principle of the nuclear power emergency diesel generating set overspeed protection device provided by the utility model is as follows:

[0029] When the diesel generator set is overspeed, the overspeed detection system sends a signal to the control system; after receiving the overspeed signal, the control system immediately energizes two parallel nuclear overspeed protection solenoid valves (overspeed protection solenoid valve 1 and overspeed protection solenoid valve 2); due to the redundant design of the solenoid valve, even if one of the solenoid valves fails, the other can still work normally, ensuring that high-pressure air can smoothly enter the diesel generator set through the connecting pipeline;

[0030] At the same time, two parallel check valves (check valve 1 and check valve 2) are also in an open state, allowing high-pressure air to pass through and preventing backflow; the redundant design of the check valve also ensures that the system can continue to provide overspeed protection function when a single valve fails;

[0031] The specially designed blocking plate 34 in the ball valve device 3, through the meshing connection of the driving gear 33 and the driven gear 36, realizes accurate control of the high-pressure air supply circuit; in normal operation, the blocking plate remains open, allowing high-pressure air to flow smoothly; when maintenance or emergency gas source shut-off is required, the driving source drives the driving gear to rotate, which drives the driven gear and the blocking plate to rotate to the closed position, effectively blocking the flow of high-pressure air, increasing the safety and flexibility of the device. When high-speed gas backflows due to the sudden closing of the valve core, if there is no appropriate blocking or buffering mechanism, the valve core may be subjected to strong impact, causing damage or failure; therefore, the purpose of designing the "blocking plate 34" is to provide a buffer area in this case, so that the high-speed gas can slow down after hitting the blocking plate, thereby reducing the impact on the valve core.

[0032] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process conversion using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An overspeed protection device for a nuclear emergency diesel generator set, characterized by, The utility model relates to an over-speed protection air bottle, which comprises a main pipe (2) connected to one side of the over-speed protection air bottle (1), a ball valve device (3) arranged in the middle of the main pipe (2), a shunt pipe (4) connected to one end of the main pipe (2), a three-way pipe (5) fixedly connected to one end of the main pipe (2) and the shunt pipe (4), an output pipe (6) connected to one end of the three-way pipe (5), a check valve (7) arranged in the middle of the main pipe (2) and the shunt pipe (4), and an over-speed protection electromagnetic valve (8) arranged in the middle of the main pipe (2) and the shunt pipe (4). The ball valve device (3) comprises a valve core (31), a connecting shaft (32), a driving gear (33), a blocking plate (34), a connecting rod (35), a driven gear (36), and a protective cover (37), the valve core (31) is arranged in the middle of the main pipe (2), the connecting shaft (32) is fixedly connected to the middle of the valve core (31), the driving gear (33) is fixedly connected to the top end of the connecting shaft (32) which extends out of the main pipe (2), a driving source is arranged at the top end of the connecting shaft (32), the blocking plate (34) is rotatably arranged in the main pipe (2), the connecting rod (35) is fixedly connected to the middle of the blocking plate (34), the driven gear (36) is fixedly connected to the top end of the connecting rod (35) which extends out of the main pipe (2), the driving gear (33) is meshingly connected to the driven gear (36), and the protective cover (37) is arranged on the outer wall of the main pipe (2) at the valve core (31), the driving source is arranged on the protective cover (37). The over-speed protection air bottle (1) is provided with a pressure sensor arranged therein for monitoring the pressure value in the over-speed protection air bottle (1) in real time. The over-speed protection air bottle (1) is fixedly connected to a main body machine (9), the ball valve device (3), the two check valves (7), and the two over-speed protection electromagnetic valves (8) are electrically connected to the main body machine (9). An alarm device is arranged on the outer wall of the over-speed protection air bottle (1) and is electrically connected to the pressure sensor and the main body machine (9).

2. The overspeed protection device for nuclear emergency diesel generator set according to claim 1, characterized by, Support columns (10) are fixedly connected to the outer wall of the over-speed protection air bottle (1) at equal intervals.

3. The overspeed protection device for nuclear emergency diesel generator set according to claim 1, characterized in that, The two over-speed protection electromagnetic valves (8) have a gas releasing function.

4. The overspeed protection device for nuclear emergency diesel generator set according to claim 1, characterized by ​ 5. The overspeed protection device for nuclear emergency diesel generator set according to claim 1, characterized by ​ 6. The overspeed protection device for nuclear emergency diesel generator set according to claim 1, characterized by ​

Images