One-way fireproof breathing valve structure for fuel tank

Abstract

The utility model discloses a kind of one-way fire prevention breathing valve structures of fuel tank, and air pipe and overflow pipe are provided on oil tank, air pipe is provided with gas valve with flame-retardant effect, the position of overflow pipe is lower than the butt joint pipe orifice position of air pipe and oil tank;In the position of oil tank in alignment air pipe pipe orifice installation has the float plate of up and down floating, the density of float plate is less than the density of fuel oil;Sealing gasket is provided on the upper surface of float plate, the size of sealing gasket is greater than the pipe orifice of air pipe, when the liquid level of fuel oil exceeds the position of overflow pipe, float plate is pushed to float by the buoyancy of fuel oil, and then sealing gasket is pushed to rise and close the pipe orifice of air pipe.Such can prevent fuel oil from leaking from air pipe to cause safety hazard, improve the security of oil tank.

Description

Technical Field

[0001] This utility model relates to the field of generator set technology, and in particular to a fireproof structure for the vent pipe of a generator set fuel tank. Background Technology

[0002] Generator sets need to be equipped with an automatic fuel supply system, usually a fuel tank. In an automatic fuel supply system, if the sensor, anti-overflow valve, or other safety control mechanism malfunctions or other unforeseen reasons cause the fuel level in the fuel tank to rise rapidly beyond the overflow pipe's discharge capacity, some fuel may overflow through the conventional flame arrestor vent valve in the vent pipe (used to balance the pressure inside and outside the fuel tank) due to the pressure difference. This could potentially cause fuel leakage and lead to a fire hazard. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a simple and rationally designed one-way fireproof breather valve structure for fuel tanks that can seal the vent pipe when the oil level rises to a predetermined position, preventing fuel leakage from the vent pipe.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a one-way fireproof breather valve structure for a fuel tank, wherein a vent pipe and an overflow pipe are provided on the fuel tank, a vent valve with flame-retardant effect is provided in the vent pipe, and the overflow pipe is positioned lower than the connection port between the vent pipe and the fuel tank; a float plate that can float up and down is installed inside the fuel tank, aligned with the opening of the vent pipe, the density of the float plate being less than the density of the fuel; a sealing gasket is provided on the upper surface of the float plate, the size of the sealing gasket being larger than the opening of the vent pipe, when the fuel level exceeds the position of the overflow pipe, the buoyancy of the fuel pushes the float plate to rise so that the sealing gasket seals the opening of the vent pipe.

[0005] Furthermore, the float is a hollow plate made of aluminum alloy, and its overall density is no more than half that of fuel oil.

[0006] Preferably, the gasket is made of fuel-resistant rubber, and the thickness of the gasket is less than the thickness of the float plate.

[0007] Furthermore, a bolt is inserted through the center of the float plate and the gasket, and the gasket and float plate are fitted onto the bolt. The bolt is screwed into the vent valve to achieve movable installation of the float plate and the gasket.

[0008] Furthermore, the vent valve is a tubular flame-retardant vent plug made of metal particles with internal voids.

[0009] Furthermore, a rain cover is installed at the top of the vent pipe, which is made of SS304 stainless steel by stamping.

[0010] This invention involves bolting a floating float to the interface between the vent pipe and the fuel tank, with a sealing gasket on the float. When the fuel level rises too quickly and contacts the float, the float moves upward under buoyancy, pushing the sealing gasket to seal the vent pipe opening. This prevents fuel leakage from the vent pipe, eliminating the safety hazard and resolving the fuel leakage risk of traditional flame arrestor vent valves, thus improving the safety of the fuel supply system. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram, 1 is the fuel tank, 2 is the vent pipe, 3 is the rain cover, 4 is the vent valve, 5 is the float plate, 6 is the sealing gasket, 7 is the bolt, 8 is the overflow pipe, and 9 is the fuel. Detailed Implementation

[0013] In this embodiment, refer to Figure 1 The fuel tank has a one-way fireproof breather valve structure. The fuel tank 1 is equipped with a vent pipe 2 and an overflow pipe 8. The vent pipe 2 contains a flame-retardant vent valve 4, which ensures the internal space of the fuel tank 1 is connected to the atmosphere and prevents external flames from spreading into the fuel tank 1. The overflow pipe 8 is installed on the upper side of the fuel tank 1, and its position is lower than the connection point between the vent pipe 2 and the fuel tank 1. A float plate 5, which can float up and down, is installed inside the fuel tank 1, aligned with the opening of the vent pipe 2. The density of the float plate 5 is less than that of the fuel 9, allowing it to float on the surface of the fuel 9. A sealing gasket 6 is provided on the upper surface of the float plate 5. The size of the sealing gasket 6 is larger than the opening of the vent pipe 2. When the fuel 9 level exceeds the position of the overflow pipe 7, the buoyancy of the fuel 9 will push the float plate 5 upward, thereby raising the sealing gasket 6 to seal the opening of the vent pipe 2, and ensuring the sealing gasket 6 remains pressed tightly even when the fuel level is too high.

[0014] The float 5 is a hollow plate made of aluminum alloy. The hollow structure ensures that the overall density of the float 5 is no more than half the density of the fuel oil 9, which is about 0.5 times the density of the fuel oil.

[0015] The sealing gasket 6 is made of fuel-resistant rubber, and its thickness is less than that of the float plate 5. For example, the float plate 5 is approximately 10 mm thick, while the sealing gasket 6 is approximately 5 mm thick.

[0016] A bolt 7 is inserted through the center of the float plate 5 and the sealing gasket 6. The sealing gasket 6 and the float plate 5 are fitted onto the bolt 7 and can move up and down along the bolt 7. The bolt 7 is screwed into the vent valve 4 to realize the movable installation of the float plate 5 and the sealing gasket 6.

[0017] The vent valve 4 is a tubular flame-retardant vent plug (common specification is DN50) made of metal particles (such as aluminum alloy particles) with internal gaps. It integrates flame-retardant and venting functions into one unit, saving installation space.

[0018] A rain cover 3 is installed at the top of the vent pipe 2 for rain and dust protection; the rain cover 3 is made of SS304 stainless steel and is connected and fixed to the vent pipe through a flange.

[0019] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A one-way fireproof breather valve structure for a fuel tank, wherein a vent pipe and an overflow pipe are provided on the fuel tank, a flame-retardant vent valve is provided in the vent pipe, and the overflow pipe is positioned below the connection point between the vent pipe and the fuel tank, characterized in that: A float that can move up and down is installed inside the fuel tank, aligned with the vent pipe opening. The density of the float is less than that of the fuel. A sealing gasket is placed on the upper surface of the float. The size of the sealing gasket is larger than the vent pipe opening. When the fuel level exceeds the overflow pipe position, the buoyancy of the fuel pushes the float to the surface, causing the sealing gasket to seal the vent pipe opening.

2. The fuel tank one-way fireproof breather valve structure according to claim 1, characterized in that: The float is a hollow plate made of aluminum alloy, and its overall density is no more than half the density of fuel oil.

3. The fuel tank one-way fireproof breather valve structure according to claim 1, characterized in that: The sealing gasket is made of fuel-resistant rubber, and its thickness is less than that of the float plate.

4. The fuel tank one-way fireproof breather valve structure according to claim 1, characterized in that: A bolt is inserted through the center of the float plate and the gasket. The gasket and the float plate are fitted onto the bolt, and the bolt is screwed into the vent valve to enable the movable installation of the float plate and the gasket.

5. The fuel tank one-way fireproof breather valve structure according to claim 1, characterized in that: The vent valve is a tubular flame-retardant vent plug made of metal particles with internal voids.

6. The fuel tank one-way fireproof breather valve structure according to claim 1, characterized in that: A rain cover is installed at the top of the vent pipe. The rain cover is made of SS304 stainless steel by stamping.

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