Explosion-proof oil tank and sealing mechanism for generator set

Abstract

The utility model belongs to the technical field of generator set, concretely relates to a kind of explosion -proof oil tank and closed mechanism for generator set, the device includes: oil tank, is arranged in the inside of generator set;The outside of the generator set is provided with recovery mechanism, it includes: recovery bucket, is arranged in the outside of the generator set;The inside of the recovery bucket is provided with partition to separate the inside of recovery bucket into oil return cavity and gas return cavity;Recovery pipe, one end with the inside communication of oil tank, other end with the gas return cavity communication;Oil return pipe, one end with recovery pipe communication, other end with the oil return cavity communication;And closed mechanism, it is arranged in the inside of the oil return pipe, and the diameter of closure plate in the closed mechanism is same with the inside diameter of the oil return pipe;Wherein the closure plate is suitable for when oil body flows into oil return pipe and contact with closure plate, offset occurs to make oil body be introduced into oil return cavity by oil return pipe.

Description

Technical Field

[0001] This utility model belongs to the field of generator set technology, specifically relating to explosion-proof oil tanks and sealing mechanisms for generator sets. Background Technology

[0002] A diesel generator set is a power supply device that uses a diesel engine as the prime mover and converts the chemical energy of diesel fuel into kinetic energy to drive a synchronous generator to generate electricity. It is a power generation device that starts quickly, provides stable power supply, requires less investment, is easy to operate and maintain, and is highly adaptable to the environment.

[0003] Existing diesel generator sets typically have a built-in fuel tank with a refueling hose connected to it. The hose opening is located on the outer wall of the generator set, and diesel fuel is added to the tank via external refueling equipment. An overflow pipe is connected to the upper part of the tank. When the amount of fuel added exceeds the overflow pipe, the excess diesel fuel will flow out and be recovered through the overflow pipe. However, when adding diesel fuel, fuel vapor in the tank may overflow and enter the generator set. If a fire occurs inside the generator set, it can easily form an explosive gas mixture.

[0004] To address the aforementioned issues, existing technologies connect the other end of the overflow pipe to a recycling bin to recover the discharged fuel vapor along with excess diesel. However, in actual use, it has been found that diesel mixed with oil vapor, possible moisture, and impurities results in poor quality, high recycling costs, and often can only be treated as hazardous waste, leading to a waste of diesel.

[0005] Therefore, an explosion-proof fuel tank and sealing mechanism for generator sets are designed to solve the technical problem of diesel waste caused by the mixing of excess water and impurities when recovering fuel vapor and excess diesel in the existing technology.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one explosion-proof oil tank and sealing mechanism for generator sets.

[0008] In a first aspect, embodiments of this disclosure provide an explosion-proof fuel tank for a generator set, comprising: The fuel tank is located inside the generator set; The generator set is externally equipped with a recovery mechanism, which includes: A recycling bin is located outside the generator set; The inside of the recycling bin is equipped with a partition plate to divide the inside of the recycling bin into an oil return chamber and an air return chamber; The recovery pipe has one end connected to the interior of the fuel tank and the other end connected to the return air chamber; The return oil pipe has one end connected to the recovery pipe and the other end connected to the return oil chamber; and A sealing mechanism is provided inside the return oil pipe, and the diameter of the sealing plate in the sealing mechanism is the same as the inner diameter of the return oil pipe.

[0009] In one alternative implementation, the closure mechanism includes: Drive components and flip components; The drive assembly is disposed on the outer wall of the return oil pipe, and the tilting assembly is disposed inside the return oil pipe; wherein The drive assembly is adapted to slide along the axial direction of the return oil pipe until it is coplanar with the flipping assembly, thereby driving the flipping assembly to rotate so that the sealing plate blocks the return oil pipe.

[0010] In one optional implementation, the driving component includes: The drive ring is slidably sleeved on the outer wall of the return oil pipe, and two drive magnetic blocks are symmetrically arranged inside the drive ring. A limiting element is disposed on the outer wall of the return oil pipe and located below the drive ring; wherein The drive ring is adapted to slide upward along the axial direction of the return oil pipe until it is coplanar with the sealing plate, and then drive the sealing plate to rotate by the drive magnetic block to block the return oil pipe.

[0011] In one alternative implementation, the flipping component includes: A rotating shaft passes through the return oil pipe and the sealing plate, and the rotating shaft is connected to the bearing of the return oil pipe; A pair of driven magnetic blocks are symmetrically arranged inside the enclosed plate; wherein The driven magnetic block is adapted to be attracted by the driving magnetic block when the driving ring slides upward to be coplanar with the sealing plate, so as to drive the sealing plate and the rotating shaft to rotate.

[0012] In one optional embodiment, a fuel supply pipe is provided below the fuel tank; wherein One end of the oil supply pipe penetrates the outer wall of the oil tank and communicates with the interior of the oil tank; and The oil supply pipe is fitted with a filter at one end inside the oil tank.

[0013] In one optional embodiment, an emergency oil extraction pipe is inserted into the upper end face of the oil tank; A temperature sensor is installed on the upper surface of the oil tank; The generator set has a placement box on its inner wall, and the placement box is equipped with a breathable flame arrester.

[0014] In one alternative embodiment, the exterior of the fuel tank is covered with a fireproof and heat-insulating layer.

[0015] Secondly, embodiments of this disclosure also provide a closing mechanism, including: Drive components and flip components; The drive assembly is disposed on the outer wall of the return oil pipe, and the tilting assembly is disposed inside the return oil pipe; wherein The drive assembly is adapted to slide along the axial direction of the return oil pipe until it is coplanar with the flipping assembly, thereby driving the flipping assembly to rotate so that the sealing plate blocks the return oil pipe.

[0016] In one optional implementation, the driving component includes: The drive ring is slidably sleeved on the outer wall of the return oil pipe, and two drive magnetic blocks are symmetrically arranged inside the drive ring. A limiting element is disposed on the outer wall of the return oil pipe and located below the drive ring; wherein The drive ring is adapted to slide upward along the axial direction of the return oil pipe until it is coplanar with the sealing plate, and then drive the sealing plate to rotate by the drive magnetic block to block the return oil pipe.

[0017] In one alternative implementation, the flipping component includes: A rotating shaft passes through the return oil pipe and the sealing plate, and the rotating shaft is connected to the bearing of the return oil pipe; A pair of driven magnetic blocks are symmetrically arranged inside the enclosed plate; wherein The driven magnetic block is adapted to be attracted by the driving magnetic block when the driving ring slides upward to be coplanar with the sealing plate, so as to drive the sealing plate and the rotating shaft to rotate.

[0018] The beneficial effects of this utility model are that, by setting up a recovery mechanism and a sealing mechanism, the fuel vapor that is discharged into the tank is stored separately in the return gas chamber during the process of adding diesel fuel into the tank. When the amount of fuel added exceeds the opening of the recovery pipe, the excess diesel fuel enters the return oil pipe through the recovery pipe. The weight of the diesel fuel causes the sealing plate to flip, thus opening the return oil pipe and allowing the excess diesel fuel to enter the return oil chamber for storage. This achieves the separation of oil vapor and diesel fuel, reducing the mixing of ambient air moisture and dust impurities into the recovered diesel fuel. Compared with mixed recovery, this method is beneficial to improving the quality of the recovered diesel fuel and reducing diesel fuel waste.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a first-view schematic diagram of the cross-sectional structure of the explosion-proof fuel tank provided in an embodiment of this disclosure; Figure 2 This is a second-view schematic diagram of the cross-sectional structure of the explosion-proof fuel tank provided in an embodiment of this disclosure; Figure 3 This is a three-dimensional structural diagram of the driving component provided in an embodiment of the present disclosure; Figure 4 A three-dimensional cross-sectional view of the flipping component is provided for the embodiments of this disclosure; Figure 5 A schematic diagram of the state of the sealing mechanism during fuel vapor circulation provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the state of the sealing mechanism when excess diesel fuel flows, as provided in an embodiment of this disclosure.

[0023] In the picture: 1. Generator set; 11. Placement box; 110. Ventilation flame arrester; 12. Temperature sensor; 13. Pipeline interface; 2. Fuel tank; 20. Emergency oil extraction pipe; 21. Fuel supply pipe; 210. Filter element; 22. Refueling pipe; 3. Recycling mechanism; 30. Recycling pipe; 31. Oil return pipe; 32. Recycling bucket; 320. Divider plate; 321. Oil return chamber; 322. Gas return chamber; 4. Enclosure mechanism; 40. Drive assembly; 401. Drive ring; 402. Drive magnet; 403. Limiting component; 404. Positioning groove; 41. Flip assembly; 410. Enclosure plate; 411. Driven magnet; 412. Rotating shaft. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0030] Research has found that existing technologies connect the other end of the overflow pipe to a recycling bin to recover the discharged fuel vapor along with excess diesel. However, in actual use, it has been found that the diesel mixes with oil vapor, possible moisture, and impurities, resulting in poor quality, high recycling costs, and often having to be treated as hazardous waste, thus wasting diesel.

[0031] Based on the above research, this disclosure provides an explosion-proof fuel tank and sealing mechanism for generator sets. By providing a recovery mechanism and a sealing mechanism, during the process of adding diesel fuel into the tank, the discharged fuel vapor enters the return gas chamber for separate storage. When the fuel level exceeds the opening of the recovery pipe, the excess diesel fuel enters the return oil pipe through the recovery pipe. The weight of the diesel fuel causes the sealing plate to flip, thus opening the return oil pipe and allowing the excess diesel fuel to enter the return oil chamber for storage. This achieves intelligent separation of oil vapor and diesel fuel, avoiding the waste of diesel fuel caused by a large amount of impurities and water mixed into the diesel fuel.

[0032] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] In some embodiments, such as Figure 1 and Figure 2As shown, when the operator judges that the diesel fuel in tank 2 is insufficient by observing the level gauge or by the running time, a refueling operation needs to be performed. At this time, the operator first seals and connects the external refueling equipment (e.g., a fuel hose with a fuel nozzle) to the interface of the refueling pipe 22 fixed on the outer wall of generator set 1. After the refueling process is started, the diesel fuel is smoothly transported to the internal cavity of tank 2 through the refueling pipe 22 under the action of external pressure. To ensure the purity and reliability of the fuel supply system, the diesel fuel output from the fuel tank 2 must pass through the fuel supply pipe 21 at the bottom of the fuel tank 2 before entering the engine. One end of the fuel supply pipe 21 that extends into the fuel tank 2 is fitted with a filter element 210. This filter element 210 includes, but is not limited to, a filter mesh skeleton made of metal or polymer material and multiple layers of composite filter paper. Its filtration precision can be selected according to the engine requirements. It can effectively intercept and adsorb solid particulate impurities, gum, and trace amounts of condensate that may be present in the fuel due to the temperature difference between day and night. This greatly reduces the risk of blockage or wear of precision components such as fuel injectors and fuel pumps. The purified diesel fuel is then continuously and reliably supplied to the engine and other core equipment in the generator set 1 through the fuel supply pipe 21.

[0036] In addition, to enhance the functionality and expandability of the fuel tank, one or more pipe interfaces 13 are added to the top of the fuel tank 2. These pipe interfaces 13 are not for daily refueling, but are reserved as functional interfaces. For example, one of the interfaces can be used to install a level sensor, or to facilitate the addition of other functional liquids such as fuel additives and water removers into the fuel tank 2 to meet maintenance needs under different operating conditions.

[0037] The vent flame arrester 110, fixed to the outer wall of generator set 1, functions to prevent a small amount of combustible mixture and exhaust gas from inevitably leaking into the crankcase from the combustion chamber through the piston ring gaps when the diesel generator is running, as the engine piston reciprocates within the cylinder. This leak causes an increase in internal crankcase pressure, which mixes with splashed engine oil to form flammable oil mist. If the pressure is not released, it can damage oil seals (such as oil seals and gaskets), leading to oil leakage. The vent flame arrester 110 serves as a vent, allowing the pressurized combustible gas and oil mist to escape smoothly into the atmosphere, thus balancing the pressure inside and outside the crankcase. Simultaneously, it extinguishes any flames or sparks that may escape from the crankcase, preventing them from igniting flammable materials in the external environment, thus achieving the dual functions of ventilation and fire prevention. The vent flame arrester 110 is housed in a mounting box 11, which is bolted to the inner wall of generator set 1, providing protection and facilitating routine maintenance and replacement.

[0038] In some embodiments, such as Figure 1As shown, the temperature sensor 12 installed on the top of the fuel tank 2 is responsible for real-time monitoring of the ambient temperature in key areas surrounding the fuel tank. Its probe is directly exposed to the air above the fuel tank, providing high monitoring accuracy and rapid response. When an open flame or abnormally high temperature occurs inside the generator set 1 due to an unexpected situation such as a short circuit or oil leak, the ambient temperature will rise sharply. Once the temperature reaches a preset safety threshold (this threshold is usually set by the control system according to safety standards, such as 120°C), the temperature sensor 12 will immediately transmit an over-temperature signal to an external controller (such as a PLC or a dedicated safety control module). After receiving the signal, the controller will start a pre-connected emergency fuel pump. The inlet of this fuel pump is connected to an emergency fuel extraction pipe 20, the opening of which is usually inserted to the bottom of the fuel tank. The fuel pump will operate at maximum power, rapidly sucking up the large amount of diesel fuel stored inside the fuel tank 2 and transferring it to an external safety storage tank far away from the fire source, fundamentally eliminating the largest potential explosion source. Even if the external flames are burning fiercely, the space for flammable oil and gas inside an empty or low-level fuel tank is extremely small, greatly reducing the risk of a violent explosion.

[0039] As a feasible implementation method, the fuel tank 2 can be designed as a double-layer structure, consisting of an inner liner to hold the fuel and an outer shell surrounding it. The two layers are connected by a support structure and evacuated to a high vacuum state, forming a vacuum insulation layer similar to that of a thermos flask. Furthermore, a layer of fire-resistant and heat-insulating material, such as ceramic fiber felt, nano-aerogel felt, or intumescent fire-retardant coating, can be wrapped on the outer wall of the fuel tank shell to effectively extend the time it takes for external high temperatures to transfer to the fuel inside the fuel tank 2.

[0040] In some embodiments, such as Figures 4 to 6 As shown, before the operator begins refueling the tank 2, the sealing mechanism 4 needs to be initially set up. The operator holds the drive ring 401 and slides it upwards along the axis of the return pipe 31. The drive ring 401 moves upwards until the drive magnet 402 inside it is approximately level with the height of the flipping assembly 41. More specifically, a key mechanical positioning point is that the upward stroke of the drive ring 401 is precisely limited when the part of the shaft 412 located outside the return pipe 31 (i.e., the shaft ends extending out of the pipe wall) just enters the positioning groove 404 on the inner wall of the drive ring 401. At this position, a pair of driven magnets 411 symmetrically embedded inside the sealing plate 410 enter the magnetic field range of the two drive magnets 402 inside the drive ring 401. Since the magnets are set with opposite poles, the magnetic attraction overcomes the small friction of the bearing of the shaft 412, driving the sealing plate 410 to rotate, so that its plane is quickly adjusted to be perpendicular to the axis of the return pipe 31, i.e. Figure 5As shown, the sealing plate 410 is horizontal and its periphery is tightly fitted against the inner wall of the return oil pipe 31, completely blocking the passage of the return oil pipe 31. Subsequently, the operator can manually slide the drive ring 401 downward, allowing it to move down along the outer wall of the return oil pipe 31 until it abuts against the limiting member 403 fixed on the pipe wall, thereby stably storing the drive ring 401 in the non-working position.

[0041] When refueling officially begins, as external diesel fuel is continuously injected, the fuel level inside fuel tank 2 gradually and steadily rises. According to the principles of fluid mechanics and gas displacement, the rising fuel level compresses the gas space at the top of the fuel tank, making its pressure slightly higher than the external atmospheric pressure. At this time, the air inside the fuel tank and the evaporated fuel vapor seek a pressure relief channel. Since the inlet of the return fuel pipe 31 is blocked by the closed plate 410, this fuel vapor (in the direction of F1 in the figure) will naturally choose to flow through the recovery pipe 30. The fuel vapor flows along the recovery pipe 30 and finally enters the return gas chamber 322, which is independently separated by the partition plate 320 in the recovery tank 32, achieving preliminary recovery of fuel vapor and avoiding the risk of deflagration caused by its direct discharge into the generator compartment.

[0042] As refueling continues, the diesel fuel level in tank 2 eventually rises to the level of the lower edge of the recovery pipe 30. With continued diesel injection, the level gradually submerges the opening of the recovery pipe 30. Because the inlet of the return pipe 31 is structurally closer to tank 2, excess diesel fuel flows into the return pipe 31 first. Initially, a small amount of diesel fuel accumulates above the sealing plate 410. Liquid diesel fuel has a much higher density than gas, and its static pressure gradually increases. When the torque generated by the weight and momentum of the accumulated diesel fuel is sufficient to overcome the static friction of the bearing of the rotating shaft 412 and the gravitational torque of the sealing plate 410 itself, it will push the sealing plate 410 and the rotating shaft 412 to rotate clockwise or counterclockwise around the bearing connection between the rotating shaft 412 and the wall of the return pipe 31, presenting a... Figure 6 As shown: the sealing plate 410 rotates from a horizontal closed state to a vertical or tilted state, thereby opening up the fluid passage. Excess diesel fuel then flows along the return oil pipe 31 (in the direction of F2 in the figure) into the separate independent chamber return oil chamber 321 in the recovery tank 32.

[0043] In summary, by incorporating the recovery mechanism 3 and the sealing mechanism 4, during refueling of the fuel tank 2, fuel vapor, due to its gaseous properties, initially enters the return gas chamber 322 through the recovery pipe 30. Excess liquid diesel, driven by its own weight, triggers the mechanical structure and is diverted to the return oil chamber 321. The two are physically separated by the partition plate 320, thus achieving the separate recovery of excess diesel and fuel vapor. This avoids the diesel pollution and waste problems caused by traditional mixed recovery methods, while significantly improving the safety of refueling operations.

[0044] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0046] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0047] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An explosion-proof fuel tank for a generator set, characterized by comprising: include: The fuel tank (2) is located inside the generator set (1); The generator set (1) is externally equipped with a recovery mechanism (3), which includes: A recycling bin (32) is located outside the generator set (1); The recycling bin (32) is provided with a partition plate (320) to divide the inside of the recycling bin (32) into an oil return chamber (321) and an air return chamber (322). The recovery pipe (30) has one end connected to the interior of the oil tank (2) and the other end connected to the return air chamber (322); The return oil pipe (31) is connected at one end to the recovery pipe (30) and at the other end to the return oil chamber (321); and A sealing mechanism (4) is provided inside the return oil pipe (31), and the diameter of the sealing plate (410) in the sealing mechanism (4) is the same as the inner diameter of the return oil pipe (31).

2. The explosion-proof fuel tank for generator sets as described in claim 1, characterized in that, The closing mechanism (4) includes: Drive component (40) and flip component (41); The drive assembly (40) is disposed on the outer wall of the return oil pipe (31), and the tilting assembly (41) is disposed inside the return oil pipe (31); wherein The drive assembly (40) is adapted to slide along the axial direction of the return oil pipe (31) to the plane with the flip assembly (41) and drive the flip assembly (41) to rotate so that the sealing plate (410) blocks the return oil pipe (31).

3. The explosion-proof oil tank for generator sets as described in claim 2, characterized in that, The driving component (40) includes: The drive ring (401) is slidably sleeved on the outer wall of the return oil pipe (31), and two drive magnetic blocks (402) are symmetrically arranged inside the drive ring (401). A limiting member (403) is disposed on the outer wall of the return oil pipe (31) and located below the drive ring (401); wherein The drive ring (401) is adapted to slide upward along the axial direction of the return oil pipe (31) until it is coplanar with the sealing plate (410), and then drive the sealing plate (410) to rotate by the drive magnet (402) to block the return oil pipe (31).

4. The explosion-proof fuel tank for generator sets as described in claim 3, characterized in that, The flipping component (41) includes: A rotating shaft (412) passes through the oil return pipe (31) and the sealing plate (410), and the rotating shaft (412) is connected to the oil return pipe (31) by a bearing; A pair of driven magnetic blocks (411) are symmetrically arranged inside the closed plate (410); wherein The driven magnetic block (411) is adapted to be attracted by the driving magnetic block (402) when the driving ring (401) slides up to be coplanar with the closing plate (410) so as to drive the closing plate (410) and the rotating shaft (412) to rotate.

5. The explosion-proof oil tank for generator sets as described in claim 1, characterized in that, An oil supply pipe (21) is provided below the oil tank (2); wherein One end of the oil supply pipe (21) penetrates the outer wall of the oil tank (2) and communicates with the interior of the oil tank (2); and The oil supply pipe (21) is fitted with a filter element (210) at one end inside the oil tank (2).

6. The explosion-proof oil tank for generator sets as described in claim 1, characterized in that, An emergency oil extraction pipe (20) is inserted into the upper end face of the oil tank (2); A temperature sensor (12) is provided on the upper surface of the oil tank (2); The generator set (1) is provided with a placement box (11) on its inner wall, and a breathable flame arrester (110) is provided inside the placement box (11).

7. The explosion-proof fuel tank for generator sets as described in claim 1, characterized in that, The oil tank (2) is covered with a fireproof and heat-insulating layer.

8. A closure mechanism characterized by, include: Drive component (40) and flip component (41); The drive assembly (40) is disposed on the outer wall of the return oil pipe (31), and the tilting assembly (41) is disposed inside the return oil pipe (31); wherein The drive assembly (40) is adapted to slide along the axial direction of the return oil pipe (31) to the plane with the flip assembly (41) and drive the flip assembly (41) to rotate so that the sealing plate (410) blocks the return oil pipe (31).

9. The closing mechanism as described in claim 8, characterized in that, The driving component (40) includes: The drive ring (401) is slidably sleeved on the outer wall of the return oil pipe (31), and two drive magnetic blocks (402) are symmetrically arranged inside the drive ring (401). A limiting member (403) is disposed on the outer wall of the return oil pipe (31) and located below the drive ring (401); wherein The drive ring (401) is adapted to slide upward along the axial direction of the return oil pipe (31) until it is coplanar with the sealing plate (410), and then drive the sealing plate (410) to rotate by the drive magnet (402) to block the return oil pipe (31).

10. The closing mechanism as described in claim 9, characterized in that, The flipping component (41) includes: A rotating shaft (412) passes through the oil return pipe (31) and the sealing plate (410), and the rotating shaft (412) is connected to the oil return pipe (31) by a bearing; A pair of driven magnetic blocks (411) are symmetrically arranged inside the closed plate (410); wherein The driven magnetic block (411) is adapted to be attracted by the driving magnetic block (402) when the driving ring (401) slides up to be coplanar with the closing plate (410) so as to drive the closing plate (410) and the rotating shaft (412) to rotate.

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