An oil tank

Abstract

The application relates to a fuel storage device of a general small gasoline engine, in particular to an oil tank which comprises an oil tank shell provided with an oil tank opening, the cavity of the oil tank shell is divided into an oil storage cavity, a gas cavity and a refueling channel, the oil storage cavity is communicated with the gas cavity, the refueling channel is communicated with the oil storage cavity, the refueling channel is separated from the gas cavity, and a channel is communicated between the gas cavity and the refueling channel. The scheme solves the problem that the oil tank is prone to oil overflow when the oil tank is in a hot engine working state of an engine or the engine is in the hot engine state and is refueled when stopping.

Description

Technical Field

[0001] This invention relates to a fuel storage device for a general-purpose small gasoline engine, specifically a fuel tank. Background Technology

[0002] Existing fuel tanks include a tank shell with a tank opening. The internal cavity of the tank shell is divided into a fuel storage chamber and a refueling channel that connects the tank opening to the fuel storage chamber. To prevent fuel from overflowing from the tank opening in the refueling channel when overfilling occurs (the tank cap at the tank opening has a vent hole for air), a portion of the internal cavity of the tank shell is also divided as a gas chamber for storing air or fuel vapor. The gas chamber is separated from the refueling channel. When overfilling occurs, the excess fuel is first stored in the refueling channel. Over time, the excess fuel in the refueling channel will slowly flow into the gas chamber, thus preventing fuel from overflowing from the refueling channel, especially in fuel tanks storing gasoline.

[0003] However, in actual use, refueling may occur when the engine is warm, such as during engine operation; or immediately after stopping the engine while it is warm. The refueling speed is relatively fast, while the volume of the refueling passage is relatively small. Therefore, it's easy to fill the tank to its rated capacity without stopping refueling in time, resulting in a large amount of fuel remaining in the refueling passage and causing overfilling. In these refueling scenarios, it has been found that fuel easily overflows from the tank opening, causing fuel spillage and creating a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a fuel tank that solves the problem of fuel overflow in the prior art when refueling is done while the engine is hot or when refueling is done while the engine is hot and stopped.

[0005] To achieve the above objectives, the basic solution of the present invention provides a fuel tank, including a fuel tank shell with a fuel tank opening. The internal cavity of the fuel tank shell is divided into an oil storage chamber, a gas chamber, and a refueling channel. The gas chamber and the refueling channel are connected through a channel located inside the fuel tank shell.

[0006] The beneficial effects of this basic solution are as follows: compared with the existing technology, when refueling while the engine is hot, even if too much is added, it is less likely that oil will overflow from the fuel tank opening, thereby reducing the problem of fuel overflow and thus reducing safety hazards.

[0007] To better address the issue of fuel tank overflow, the channel is located at the junction of the gas chamber and the refueling channel.

[0008] To better address the issue of fuel tank overflow, a reinforcing section is fixed at the junction of the gas cavity and the refueling channel, with the channel located on the reinforcing section.

[0009] To better address the issue of oil spillage from the fuel tank, the reinforcing section is integrally formed with the fuel tank shell.

[0010] To better address the issue of oil spillage from the tank, the reinforcing section has a limiting end that defines the rated volume of the oil storage chamber.

[0011] To better address the issue of fuel tank overflow, the minimum cross-sectional area of ​​the channel is no greater than 3.5 square millimeters. This design not only further improves the fuel tank's overflow prevention effect but also reduces the number of components compared to using separate control valves or other individual parts for overflow prevention. This simplifies the structure, reduces costs, and minimizes the number of components, thus reducing factors that could negatively impact the overall structural performance of the fuel tank and improving its overall quality.

[0012] To better address the issue of oil spillage from the tank, the minimum cross-sectional area of ​​the channel is between 0.2 and 2.5 square millimeters.

[0013] To better address the issue of oil spillage from the tank, the extension of the centerline of the channel passes through the tank opening. This design allows the channel to be formed by drilling after the tank is molded, reducing the difficulty and cost of channel fabrication.

[0014] To better address the issue of fuel tank overflow, the angle between the centerline of the channel and the plane containing the fuel tank opening is between 45° and 90°. This design allows the surrounding structure to occupy a moderate amount of space on the fuel tank and strengthens the load-bearing capacity of the area between the refueling channel and the gas chamber, thus improving the fuel tank's impact resistance.

[0015] To better address the issue of fuel tank overflow, the minimum cross-section of the channel is located in the section closest to the refueling channel. This design not only improves the tank's ability to prevent overflow but also facilitates channel fabrication, thereby reducing overall processing costs and enabling better control over channel quality.

[0016] To better address the issue of fuel tank overflow, the end of the channel that connects to the refueling channel is funnel-shaped.

[0017] To better address the issue of oil spillage from the tank, the channel comprises a first channel segment, a second channel segment, and a third channel segment from one end to the other. The first channel segment is funnel-shaped, the second channel segment has the smallest cross-sectional area, and the third channel segment is a gradually increasing cross-sectional area.

[0018] Furthermore, the fuel tank shell is integrally formed. This design helps improve the quality of the fuel tank and reduce its cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the fuel tank of the present invention; Figure 2 for Figure 1 Enlarged view of point B in the middle; Figure 3 for Figure 1 A diagram showing the state of the fuel tank when it is overfilled. Figure 4 This is a graph showing the relationship between the oil inlet velocity of the gas cavity and the minimum cross-sectional area of ​​the channel. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. oil tank opening; 2. refueling channel; 3. reinforcing part; 4. oil storage chamber; 5. gas chamber; 6. rated volume liquid level; 7. channel; 71. first channel section; 72. second channel section; 73. third channel section.

[0021] The basic implementation examples are as follows: Figure 1 , Figure 2 and Figure 3The diagram shows a fuel tank comprising a tank shell with a fuel tank opening. The tank shell has a cavity divided into a fuel storage chamber 4, a gas chamber 5, and a refueling channel 2. The fuel storage chamber 4 and the gas chamber 5 are interconnected, and the refueling channel 2 is interconnected with the fuel storage chamber 4. Both the gas chamber 5 and the refueling channel 2 are located on the same side of the fuel storage chamber 4. In this embodiment, the fuel tank shell is manufactured using an integral molding method, such as blow molding. In this embodiment, a reinforcing part 3 is provided at the junction between the refueling channel 2 and the gas chamber 5. The reinforcing part 3 is integrally formed with the fuel tank shell, separating the refueling channel 2 and the gas chamber 5. The amount of material used in the reinforcing part 3 is appropriately controlled, thereby enhancing the stress performance of the area between the refueling channel 2 and the gas chamber 5. Simultaneously, the bottom of the reinforcing part 3 also limits the fuel level 6 of the rated volume of the fuel tank. During normal refueling, when the fuel level in the fuel storage chamber 4 rises to the bottom of the reinforcing part 3, it stops moving into the gas chamber 5. The reinforcing part 3 is provided with a channel 7 that connects the gas cavity 5 and the refueling channel 2. The minimum cross-sectional area of ​​the channel 7 is 0.5 square millimeters. The extension of the center line of the channel 7 passes through the fuel tank opening 1 and makes an angle α of 60° with the plane where the fuel tank opening 1 is located, so as to facilitate drilling through the channel 7. In this embodiment, the channel 7 is divided into a first channel segment 71, a second channel segment 72 and a third channel segment 73 from the refueling channel 2 to the gas cavity 5. The first channel segment 71 is funnel-shaped. The cross-sectional area of ​​the second channel segment 72 is smaller than that of the third channel segment 73, so that the cross-sectional area of ​​the second channel segment 72 is the minimum cross-sectional area of ​​the channel 7.

[0022] Of course, when the second channel segment 72 of channel 7 is formed by drilling, the hole diameter of the second channel segment 72 can be set at about 2 mm, so that the cross-sectional area of ​​the second channel segment 72 is about 3 square millimeters. This allows the use of a larger diameter drill bit, making the drill bit less prone to damage and helping to reduce drill bit wear.

[0023] Of course, the angle α between the centerline of channel 7 and the plane where the oil tank opening 1 is located can be specifically selected according to the needs of processing and forming, such as 45°, 90°, etc.

[0024] like Figure 4 As shown, through experimental verification of the fuel tank, the oil inlet velocity of the gas cavity is positively correlated when the minimum cross-sectional area of ​​the channel is in the range of 0.1-3.5 square millimeters. In particular, when the minimum cross-sectional area of ​​the channel is in the range of 0.2-2.5 square millimeters, the rate at which the oil inlet velocity of the gas cavity increases with the increase of the area is relatively slow, and the fuel tank has a significant effect on preventing oil spillage.

[0025] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A fuel tank, comprising a fuel tank shell with a fuel tank opening, wherein the internal cavity of the fuel tank shell is divided into a fuel storage chamber, a gas chamber, and a refueling channel, characterized in that: A reinforcing section is fixed at the junction of the gas cavity and the refueling channel. The reinforcing section has a limiting end for limiting the rated volume liquid level of the oil storage cavity. The gas cavity and the refueling channel are connected by a channel provided on the reinforcing section. The minimum cross-section of the channel is located in the section of the channel close to the refueling channel. The end of the channel that connects to the refueling channel is funnel-shaped. The channel includes a first channel section, a second channel section, and a third channel section from one end to the other. The first channel section is funnel-shaped, the second channel section is the minimum cross-section section, and the third channel section is a gradually increasing cross-section section.

2. A fuel tank according to claim 1, characterized in that: The reinforcing part is integrally formed with the fuel tank shell.

3. The fuel tank according to claim 1, characterized in that: The minimum cross-sectional area of ​​the channel is no more than 3.5 square millimeters.

4. A fuel tank according to claim 3, characterized in that: The minimum cross-sectional area of ​​the channel is between 0.2 and 2.5 square millimeters.

5. A fuel tank according to any one of claims 1-4, characterized in that: The extension of the centerline of the channel passes through the tank opening.

6. A fuel tank according to claim 5, characterized in that: The angle between the centerline of the channel and the plane where the tank opening is located is between 45° and 90°.

7. A fuel tank according to any one of claims 1-4 or 6, characterized in that: The fuel tank shell is integrally formed.

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