A fuel delivery system for a nuclear power emergency diesel generator set

Abstract

The present application relates to the field of environmental protection technologies and discloses a nuclear power emergency diesel generator set, which includes a tank body. A fuel storage cavity is arranged inside the tank body, and a floating disc is sleeved inside the fuel storage cavity; uniformly distributed concave grooves are formed inside the floating disc, an elastic rubber layer is arranged at the bottom of each concave groove, through holes are formed between the concave grooves on the same straight line, a sealing ring layer is sleeved on the outer side wall of the floating disc, uniformly distributed deformation cavities are formed inside the sealing ring layer, uniformly distributed communication holes II are formed inside the sealing ring layer, uniformly distributed communication holes I are formed on the floating disc, and the concave grooves close to the sealing ring layer are communicated with the deformation cavities through the communication holes I and the communication holes II. In the present invention, fuel squeezes the elastic rubber layer, causing the elastic rubber layer to deform into the concave grooves, enabling the gas inside the concave grooves to enter the deformation cavities under extrusion, causing the sealing ring layer to deform outward, thereby increasing the force of the sealing ring layer pressing against the inner wall of the tank body and enhancing the sealing effect of the sealing ring layer.

Description

Technical Field

[0001] This application relates to the field of environmental protection technologies, and particularly to a fuel delivery system for a nuclear power emergency diesel generator set. Background Art

[0002] An emergency diesel generator set is one of the important components of the nuclear power plant system equipment, and is also known as the last line of defense. For the safety functions it performs, it is required that each auxiliary equipment operates reliably, has a low failure rate, and is convenient for operation and maintenance; a fuel storage tank and a daily fuel tank are two necessary equipment for the fuel system of the emergency diesel generator set. Generally, each unit is equipped with an independent fuel storage tank and a daily fuel tank. However, there is also a special case where a nuclear power plant uses two fuel storage tanks to supply fuel to three daily fuel tanks due to site restrictions. The working state is that fuel storage tank A can choose to supply fuel to the 1# daily fuel tank or the 2# daily fuel tank, and fuel storage tank B can choose to supply fuel to the 3# daily fuel tank or the 2# daily fuel tank.

[0003] Based on the above situation, the present invention has invented a new method for switching the fuel delivery of a nuclear power emergency diesel generator set using solenoid valves, which can switch the fuel delivery circuit according to instructions to ensure that all three units can operate according to the predetermined requirements.

[0004] Among them, in order to provide a large amount of fuel to the diesel generator set, it is necessary that the fuel storage tank stores enough fuel. Moreover, during the storage period of the fuel stored in the fuel storage tank, the fuel loss caused by fuel volatilization should be small enough, the contamination of the fuel should be small enough, and the corrosion of the fuel to the storage tank should be small enough. Therefore, generally, an internal floating roof fuel storage tank or an external floating roof fuel storage tank is used to store and protect the fuel.

[0005] Internal floating roof fuel storage tank mainly adds a disc-shaped floating roof inside the storage tank with a top cover. Below the floating roof is a metal support for the floating roof. Metal floating balls or plastic floating balls are arranged between the metal supports. A sealing ring is arranged on the outer circumference of the floating roof. The outer circumference of the sealing ring fits with the inner wall of the storage tank. When fuel is sent into the storage tank through the delivery pipe, the fuel will fill the bottom of the storage tank. At this time, the fuel will wrap the floating balls below the floating roof, and the liquid level of the fuel will also contact the bottom end of the floating roof. With the continuous input of fuel, the fuel will push the floating roof to move upward. At this time, the sealing ring rubs against the inner wall of the storage tank to prevent the fuel from floating up through the gap between the floating roof and the inner wall of the storage tank, so that the fuel is always pressed below the floating roof. When the fuel is no longer input, the floating roof will seal and store the fuel below. At this time, the direct contact between the fuel and the floating roof without a gas phase space results in a weakened fuel volatilization effect, and the loss caused by fuel volatilization is greatly reduced at this time (there is still fuel volatilization loss. The volatilized fuel gas will be discharged from the gap between the sealing ring and the inner wall of the storage tank, or from the gap between the cable passing through the floating roof and the floating roof, or from the gap between the sampling pipe passing through the floating roof and the floating roof). When fuel needs to be used, the fuel in the storage tank will be gradually sucked away. At this time, the liquid level of the fuel drops continuously, causing the floating roof to move downward under its own gravity until the bottom end of the floating roof contacts the liquid level of the fuel that has stopped being exported again.

[0006] In the above process, in order to ensure the smooth up and down movement of the floating roof, the contact pressure between the sealing ring and the inner wall of the storage tank cannot be too large, which makes the sealing effect between the sealing ring and the inner wall of the storage tank not ideal. At the same time, during the process of the fuel pushing the floating roof upward, direct friction will occur between the sealing ring and the inner wall of the storage tank, resulting in increased wear of the sealing ring. When the fuel liquid level drops, part of the liquid will remain on the inner wall of the storage tank. At this time, when the floating roof moves downward, affected by the remaining fuel between the sealing ring and the inner wall of the storage tank, the wear of the sealing ring is reduced. However, after the floating roof moves downward continuously, there is still part of the fuel remaining on the inner wall of the storage tank. At this time, the remaining fuel is in direct contact with the air, and this part of the remaining fuel will volatilize, resulting in an increase in the overall volatilization loss of the fuel. Summary of the Invention

[0007] The present application provides a fuel delivery system for a nuclear power emergency diesel generator set, which has a fuel and a volatile gas squeezing elastic rubber layer. The elastic rubber layer deforms into the concave groove, and the gas in the concave groove is pressed into the deformation cavity under the extrusion of the elastic rubber layer. The increased air pressure in the deformation cavity causes the sealing ring layer to expand, improving the sealing performance between the expanded sealing ring layer and the inner wall of the oil storage cavity. The gas volatilized from the fuel will flow towards the position of the elastic rubber layer. When the floating disc moves downward, the rubber ring will scrape and adhere the fuel on the inner wall of the oil storage cavity to gather above the sealing ring layer. When the floating disc moves upward, the fuel above the sealing ring layer will be smeared on the inner wall of the oil storage cavity to act as a lubricant, so as to solve the problems of unsatisfactory sealing effect of the existing floating disc, large loss of gas volatilized from the fuel, and volatilization loss of the fuel remaining on the inner wall of the storage tank.

[0008] To achieve the above object, the present application adopts the following technical solutions: A nuclear power emergency diesel generator set includes a tank body, and an oil storage cavity is arranged inside the tank body. A floating disc is sleeved inside the oil storage cavity; Uniform concave grooves are formed inside the floating disc to provide a space for gas flow. An elastic rubber layer is provided at the bottom of the concave groove to receive external pressure changes. Through holes are formed between the concave grooves on the same straight line to transmit the gas in adjacent concave grooves; A sealing ring layer is sleeved on the outer side wall of the floating disc, and the outer side wall of the sealing ring layer is attached to the inner wall of the oil storage cavity to cooperate with the floating disc to seal the fuel in the oil storage cavity. Uniform deformation cavities are formed inside the sealing ring layer to drive the sealing ring layer to deform when the air pressure in the deformation cavity changes; Uniform communication holes II are formed on one side of the sealing ring layer close to the center of the floating disc, and uniform communication holes I are formed on the floating disc and connected to the communication holes II. Each communication hole I is connected to the concave groove close to the deformation cavity, and the concave groove close to the deformation cavity is connected to the deformation cavity through the communication hole I and the communication hole II to transmit the gas in the concave groove and the deformation cavity.

[0009] Preferably, uniform floating cavities are formed inside the floating disc, and the floating cavities are located between two adjacent concave grooves in the circumferential direction to provide buoyancy for the upward movement of the floating disc.

[0010] Preferably, a support frame is connected to the outer side of the top end of the floating disc, and a rubber ring is connected to the top of the support frame. The rubber ring is circular and presses on the inner wall of the oil storage cavity to perform secondary sealing on the fuel.

[0011] Preferably, the oil storage cavity is in the shape of an inverted frustum, the bottom of the inner wall of the oil storage cavity is closer to the center of the oil storage cavity than the top of the inner wall, and the inclination angle of the inner wall of the oil storage cavity is not greater than three degrees to cooperate with the rubber ring to scrape the fuel on the inner wall of the oil storage cavity.

[0012] Preferably, the top end of the sealing ring layer is provided with an inclined surface, and the position of the end of the inclined surface close to the inner wall of the oil storage cavity is lower than the end of the inclined surface far from the inner wall of the oil storage cavity, which is used to guide the fuel above the sealing ring layer to be smeared on the inner wall of the oil storage cavity.

[0013] Preferably, an annular inner groove is formed at the bottom end of the sealing ring layer, and the inner groove is located below the deformation cavity, which is used to change the direction of the deformation of the bottom of the sealing ring layer.

[0014] Preferably, a fuel delivery system for a nuclear power emergency diesel generator set includes four nuclear safety class III explosion-proof solenoid valves, a control device, and connecting pipes; nuclear safety class III explosion-proof solenoid valves are provided for selecting to supply oil to the 1# fuel day tank or the 2# fuel day tank or the 3# fuel day tank, and have a manual control function; a control device is provided for controlling the solenoid valves on the fuel pipeline so that they are controlled by the start-stop state signals of the unit; connecting pipes are provided for transporting the fuel from the fuel storage tank to the fuel day tank.

[0015] The present application has the following beneficial effects:

[0016] In the fuel delivery system for a nuclear power emergency diesel generator set provided by the present application, the fuel squeezes the elastic rubber layer, causing the elastic rubber layer to deform into the concave groove, so that the gas in the concave groove enters the deformation cavity under extrusion, causing the sealing ring layer to deform outward, thereby increasing the force of the sealing ring layer pressing against the inner wall of the tank and enhancing the sealing effect of the sealing ring layer.

[0017] At the same time, due to the space in the concave groove, the gas generated by the evaporation of the fuel will converge to the concave formed by the elastic rubber layer deformed into the concave groove (due to the existence of the concave groove, the volatilized gas will flow in the direction where it can flow), that is, between the elastic rubber layer and the fuel liquid level, reducing the problem of the volatilized fuel gas being discharged through various gaps. At this time, the volatilized fuel will cause the overall pressure below the floating disc to increase (the pressure of the fuel plus the pressure of the volatilized gas), causing the elastic rubber layer in contact with the fuel gas to deform into the concave groove again, increasing the gas input from the concave groove into the deformation cavity, increasing the deformation of the sealing ring layer, and increasing the extrusion force between the sealing ring layer and the inner side wall of the tank, thereby further improving the sealing performance of the sealing ring layer.

[0018] Meanwhile, the inner cavity of the tank body presents an inverted frustum shape that gradually expands from bottom to top, making the inner side wall of the tank body inclined with the bottom end close to the center of the tank body and the top end far from the center of the tank body. When the fuel pushes the floating disc upward, affected by the deformation of the sealing ring layer, the sealing ring layer is always pressed against the inclined inner wall of the tank body. When the fuel is output from the tank body, the liquid level of the fuel will continuously drop. At this time, the extrusion force of the fuel on the elastic rubber layer fails, causing the elastic rubber layer to rebound, reducing the gas in the deformation cavity, reducing the deformation of the sealing ring layer. Affected by the inclination of the inner side wall of the tank body, the floating disc cannot move downward smoothly automatically. At this time, since the liquid level of the fuel is far from the bottom end of the floating disc, the air pressure between the bottom end of the floating disc and the fuel liquid level decreases, causing the gas in the concave groove to push the elastic rubber layer to expand and deform in the direction of the fuel liquid level. At this time, the gas in the deformation cavity will also be sucked away, reducing the air pressure in the deformation cavity, weakening the ability of the sealing ring layer to resist external forces. At the same time, the atmosphere will press on the upper part of the floating disc, causing the floating disc to move downward quickly under the influence of the atmospheric pressure, its own gravity, and the reduced friction between the sealing ring layer and the inner side wall of the tank body.

[0019] Meanwhile, affected by the inclination of the inner wall of the tank body, when the floating disc moves downward, the force of the rubber ring pressing against the inner wall of the tank body will continuously increase, causing the rubber ring to scrape the fuel adhering to the inner wall of the tank body. The scraped fuel will fall and converge above the sealing ring layer, reducing the direct contact area between the converged fuel and the air and separating it from the outside air by the rubber ring, thereby reducing the volatilization of the fuel adhering to the inner wall of the tank body.

[0020] Meanwhile, when the floating disc moves upward, the fuel converged above the sealing ring layer will move upward under the push of the sealing ring layer, causing the fuel here to smear on the inner wall of the tank body. Thus, the fuel smeared on the inner wall of the tank body acts as a lubricant, reducing the friction and wear between the sealing ring layer and the inner wall of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles disclosed in the present application.

[0022] Referring to the drawings, the present application can be more clearly understood according to the following detailed description, where:

[0023] Figure 1 is a schematic diagram of the fuel delivery system of the present invention;

[0024] Figure 2 is a schematic diagram of the structural position of the tank body and the floating disc of the present invention;

[0025] Figure 3 is a schematic diagram of the internal structure distribution of the floating disc of the present invention;

[0026] Figure 4Schematic diagram of the sunken groove distribution of the present invention;

[0027] Figure 5 Schematic diagram of the internal structure of the sunken groove of the present invention;

[0028] Figure 6 Schematic diagram of the state of the rubber ring when the floating disc of the present invention moves upward;

[0029] Figure 7 Schematic diagram of the state of the rubber ring when the floating disc of the present invention moves downward.

[0030] Reference numerals:

[0031] 1, tank body; 2, floating disc; 3, sunken groove; 301, communication hole I; 4, through hole; 5, elastic rubber layer; 6, floating cavity; 7, sealing ring layer; 8, inner groove; 9, deformation cavity; 901, communication hole II; 10, support frame; 11, rubber ring; 12, support foot. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0033] Embodiment 1

[0034] Please refer to Figure 2 , Figures 6 to 7 , a nuclear power emergency diesel generator set, including a tank body 1, a fuel storage cavity is arranged in the tank body 1, the fuel storage cavity is in the shape of an inverted frustum, the bottom of the inner wall of the fuel storage cavity is closer to the center of the fuel storage cavity than the top of the inner wall, and the inclination angle of the inner wall of the fuel storage cavity is not greater than three degrees, so that when the floating disc 2 moves downward, the force of the rubber ring 11 pressing against the inner wall of the tank body 1 will continuously increase, so that the rubber ring 11 scrapes the fuel adhering to the inner wall of the tank body 1, so that the scraped fuel drops and converges above the sealing ring layer 7, so that the direct contact area between the converged fuel and the air is reduced, and the converged fuel is separated from the outside air by the rubber ring 11, thereby reducing the volatilization of the fuel adhering to the inner wall of the tank body 1.

[0035] Refer to Figures 2 to 5, a floating disk 2 is movably sleeved in the oil storage cavity. The bottom end of the floating disk 2 is fixedly connected with uniformly distributed support feet 12. When the fuel output in the oil storage cavity is excessive, the support feet 12 can support the floating disk 2 to float in the oil storage cavity, preventing the floating disk 2 from directly contacting the bottom end of the oil storage cavity, thus avoiding the problem that the fuel subsequently input into the oil storage cavity cannot be input. Uniformly distributed concave grooves 3 are formed in the floating disk 2, and through holes 4 are formed between the concave grooves 3 on the same straight line. When the fuel and the gas volatilized from the fuel squeeze the elastic rubber layer 5, the elastic rubber layer 5 will deform into the concave groove 3, and the deformed elastic rubber layer 5 will push the air flow in the concave groove 3, so that the gas in the concave groove 3 will flow through the through hole 4 to the concave groove 3 close to the sealing ring layer 7. The flowing gas will finally enter the deformation cavity 9 through the communication hole I 301 and the communication hole II 901, increasing the pressure in the deformation cavity 9, prompting the sealing ring layer 7 to expand and deform outward, increasing the force of the sealing ring layer 7 pressing against the inner wall of the oil storage cavity, thereby enhancing the sealing effect of the sealing ring layer 7. At the same time, due to the fluidity of the volatile gas, the volatile gas will not be evenly located at the elastic rubber layer 5 at the bottom of all the concave grooves 3. This makes the buoyancy of different parts of the floating disk 2 different. When the deformation of the elastic rubber layer 5 receiving the fuel volatile gas increases, the gas in the concave groove 3 sealed with this elastic rubber layer 5 will provide more gas to the connected deformation cavity 9, making the pressure in this deformation cavity 9 greater than that in other parts of the deformation cavity 9, and making the deformation amount of the sealing ring layer 7 at this part greater than that in other parts, thereby increasing the friction between the sealing ring layer 7 and the inner wall of the oil storage cavity at this part, preventing the problem of the upward tilt of this part caused by the increase in the local buoyancy of the floating disk 2, and reducing the possibility of the floating disk 2 tipping over and sinking due to uneven local buoyancy. The bottom opening of the concave groove 3 is located at the bottom end of the floating disk 2, and an elastic rubber layer 5 is provided at the bottom opening of the concave groove 3, enabling the fuel to squeeze the elastic rubber layer 5 and deform the elastic rubber layer 5 into the concave groove 3. At the same time, when the fuel volatilizes gas, the gas will flow to the place where it can flow, so that the volatilized gas will flow towards the elastic rubber layer 5. At this time, the pressure below the floating disk 2 increases (the pressure of the fuel and the gas volatilized from the fuel), causing the volatilized gas to squeeze the elastic rubber layer 5 to continue to deform into the concave groove 3. The concave groove 3 sealed by the elastic rubber layer 5 is filled with gas, such as air, enabling the elastic rubber layer 5 deformed into the concave groove 3 to push the gas in the concave groove 3 to flow. Or when the fuel is discharged, resulting in the bottom end of the floating disk 2 not being in direct contact with the fuel liquid level, the space pressure below the floating disk 2 will decrease at this time, causing the gas in the concave groove 3 to push the elastic rubber layer 5 to deform downward the floating disk 2, thereby increasing the space in the concave groove 3 and reducing the air pressure, causing the gas in the deformation cavity 9 to flow back into the concave groove 3. At this time, the air pressure in the deformation cavity 9 decreases, reducing the deformation amount of the sealing ring layer 7. At this time, the friction between the sealing ring layer 7 and the inner wall of the oil storage cavity will decrease, enabling the floating disk 2 to move down smoothly. In the circumferential direction, a floating cavity 6 is formed between two adjacent concave grooves 3.The bottom end of the floating cavity 6 is close to the bottom end of the floating disc 2, so that when the fuel squeezes the elastic rubber layer 5, the fuel wrapped outside the floating cavity 6 can provide a large enough buoyancy to the floating disc 2 through the floating cavity 6, prompting the floating disc 2 to move upward.

[0036] Refer to Figures 2 to 3 , Figures 5 to 7 , a sealing ring layer 7 is fixedly sleeved on the circumferential side wall of the floating disc 2, the outer side wall of the sealing ring layer 7 is attached to the inner wall of the oil storage cavity, the top end of the sealing ring layer 7 is provided with an inclined surface, the position of the end of the inclined surface close to the inner wall of the oil storage cavity is lower than the end of the inclined surface far from the inner wall of the oil storage cavity, so that when the floating disc 2 moves upward, the fuel converging above the sealing ring layer 7 will move upward under the push of the sealing ring layer 7, so that the fuel here is smeared on the inner wall of the tank body 1, so that the fuel smeared on the inner wall of the tank body 1 acts as a lubricant, reducing the friction and wear between the sealing ring layer 7 and the inner wall of the tank body 1. Uniform deformation cavities 9 are opened in the sealing ring layer 7, uniformly distributed communication holes II 901 are opened on the side of the sealing ring layer 7 close to the center of the floating disc 2, uniformly distributed communication holes I 301 are opened on the floating disc 2 and are connected to the communication holes II 901, the communication holes I 301 are connected to the recessed grooves 3 close to the deformation cavities 9, and the recessed grooves 3 close to the deformation cavities 9 are connected to the deformation cavities 9 through the communication holes I 301 and the communication holes II 901, so that when the elastic rubber layer 5 deforms, it can drive the gas flow in the recessed grooves 3, thereby changing the air pressure in the deformation cavities 9.

[0037] Refer to Figure 2 , Figures 5 to 7 , a support frame 10 is fixedly connected to the outer side of the top end of the floating disc 2, a rubber ring 11 is fixedly connected to the top of the support frame 10, the rubber ring 11 is circular, and the rubber ring 11 presses on the inner wall of the oil storage cavity, so that when the floating disc 2 moves downward, the force of the rubber ring 11 pressing on the inner wall of the tank body 1 will continuously increase, so that the rubber ring 11 scrapes the fuel adhering to the inner wall of the tank body 1, so that the scraped fuel drops and converges above the sealing ring layer 7, so that the direct contact area between the converged fuel and the air (the air between the rubber ring 11 and the sealing ring layer 7) is reduced, and it is separated from the outside air (the air above the rubber ring 11) by the rubber ring 11, thereby reducing the volatilization of the fuel adhering to the inner wall of the tank body 1.

[0038] Existing top covers, ventilation holes, manholes, slides, etc. can be added above the tank body 1, and existing manholes, zip lines, sampling pipes, etc. can be added on the floating disc 2.

[0039] Embodiment 2

[0040] Please refer to Figures 4 to 5, on the basis of the first embodiment, an annular inner groove 8 is formed at the bottom end of the sealing ring layer 7. The inner groove 8 is located below the deformation cavity 9. When the air pressure in the deformation cavity 9 increases, it will squeeze the sealing ring layer 7 to spread around. When the bottom of the sealing ring layer 7 expands outward, affected by the inner groove 8, the parts of the sealing ring layer 7 on both sides of the inner groove 8 will expand in opposite directions, causing the parts of the sealing ring layer 7 near the inner wall of the oil storage cavity in the inner groove 8 to expand toward the inner wall of the oil storage cavity. As a result, the force and area of the bottom of the sealing ring layer 7 pressing against the inner wall of the oil storage cavity increase, further improving the sealing performance of the sealing ring layer 7.

[0041] Embodiment Three

[0042] Please refer to Figure 1 , a new type of fuel delivery system for nuclear power emergency diesel generator sets using solenoid valves, mainly including: a fuel delivery switching function for the unit. A nuclear safety class III explosion-proof solenoid valve is installed on the pipeline between the fuel storage tank and the daily fuel tank to select to supply fuel to the 1# daily fuel tank or the 2# daily fuel tank or the 3# daily fuel tank, and at the same time has a manual control function. In the extreme case of control failure, fuel delivery switching can be carried out manually; a control device is provided to control the solenoid valve on the fuel pipeline so that it is controlled by the unit start-stop status signal; a connecting pipeline is provided to transport the fuel from the fuel storage tank to the daily fuel tank.

[0043] A new type of fuel delivery system for nuclear power emergency diesel generator sets using solenoid valves according to the present invention is applicable to emergency diesel generator sets for nuclear power plants or other diesel engine systems with high reliability requirements.

Claims

1. A nuclear power emergency diesel generator set, characterized in that, it includes a tank body (1), a fuel storage chamber is arranged inside the tank body (1), and a floating disc (2) is sleeved inside the fuel storage chamber; uniformly distributed concave grooves (3) are formed inside the floating disc (2) for providing a space for gas flow, an elastic rubber layer (5) is arranged at the bottom of the concave groove (3) for receiving external pressure changes, and through holes (4) are formed between the concave grooves (3) on the same straight line for transmitting gases in adjacent concave grooves (3); a sealing ring layer (7) is sleeved on the outer side wall of the floating disc (2), and the outer side wall of the sealing ring layer (7) fits with the inner wall of the fuel storage chamber for cooperating with the floating disc (2) to seal the fuel in the fuel storage chamber, and uniformly distributed deformation chambers (9) are formed inside the sealing ring layer (7) for driving the sealing ring layer (7) to deform when the air pressure in the deformation chambers (9) changes; uniformly distributed communication holes II (901) are formed on one side of the sealing ring layer (7) close to the center of the floating disc (2), uniformly distributed communication holes I (301) communicated with the communication holes II (901) are formed on the floating disc (2), and a single communication hole I (301) is communicated with the concave groove (3) close to the deformation chamber (9), and the concave groove (3) close to the deformation chamber (9) is communicated with the deformation chamber (9) through the communication hole I (301) and the communication hole II (901) for transmitting gases in the concave groove (3) and the deformation chamber (9).

2. The nuclear power emergency diesel generator set according to claim 1, characterized in that, uniformly distributed floating cavities (6) are formed inside the floating disc (2), and the floating cavities (6) are located between two adjacent concave grooves (3) in the circumferential direction for providing buoyancy for the upward movement of the floating disc (2).

3. The nuclear power emergency diesel generator set according to claim 1, characterized in that, a support frame (10) is connected to the outer side of the top end of the floating disc (2), a rubber ring (11) is connected to the top of the support frame (10), the rubber ring (11) is in a circular ring shape, and the rubber ring (11) presses on the inner wall of the fuel storage chamber for secondary sealing of the fuel.

4. The nuclear power emergency diesel generator set according to claim 3, characterized in that, the fuel storage chamber is in an inverted frustum shape, the bottom of the inner wall of the fuel storage chamber is closer to the center of the fuel storage chamber than the top of the inner wall, and the inclination angle of the inner wall of the fuel storage chamber is not greater than three degrees for cooperating with the rubber ring (11) to scrape the fuel on the inner wall of the fuel storage chamber.

5. The nuclear power emergency diesel generator set according to claim 4, characterized in that, the top end of the sealing ring layer (7) is provided with an inclined surface, and the position of one end of the inclined surface close to the inner wall of the fuel storage chamber is lower than the position of the other end of the inclined surface far from the inner wall of the fuel storage chamber for guiding the fuel above the sealing ring layer (7) to be smeared on the inner wall of the fuel storage chamber.

6. The nuclear power emergency diesel generator set according to claim 1, characterized in that, an annular inner groove (8) is formed at the bottom end of the sealing ring layer (7), and the inner groove (8) is located below the deformation chamber (9) for changing the direction when the bottom of the sealing ring layer (7) deforms.

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