Oil filling port structure of fuel tank of special vehicle

Abstract

The utility model discloses an oil filler structure of a fuel tank of a special vehicle. An oil filler of the fuel tank sequentially comprises an oil filler cover, an oil filling pipe assembly and a welding flange welded on an oil inlet of a top plate of the oil tank from an oil filling end to an oil inlet of the oil tank. One end of the vent hole is communicated with the interior of the oil tank, and the other end of the vent hole is communicated with the oil filling pipe assembly. The oil filling pipe assembly comprises a ventilation transition flange, an outer pipe, a flow guide inner pipe and a mounting flange. One end of the outer pipe is connected with the welding flange, the other end of the outer pipe is connected with the mounting flange, and a ventilation transition flange is further arranged between the outer pipe and the mounting flange. One end of the flow guide inner pipe is connected with the inner wall of the ventilation transition flange, and the other end is connected with the welding flange. The oil filling pipe is of a double-layer structure, and a gap between interlayers is used for internal and external airflow intercommunication. During refueling, airflow in the oil tank flows to the interlayer of the oil filler assembly through the vent hole in the welding flange and then is exhausted to the atmosphere, and the risk that an accelerator film formed during refueling hinders exhausting of gas in the oil tank is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to special vehicle technical field, concretely is a kind of special vehicle fuel tank filler structure. BACKGROUND

[0002] Since special vehicle is mainly used for field operation, refueling condition is relatively poor, oil quality is relatively poor, and foreign matter is easily led into fuel tank, so as to prevent foreign matter in fuel tank from being stuck into return oil port or into fuel pipeline, leading to fuel supply not smooth and affecting normal driving of vehicle, so special vehicle usually sets filter screen in filler.However, after increasing filter screen, it is prone to slow oil-granting speed, and when high-speed oil gun is used for refueling, oil spill and return from filler position also easily occur. SUMMARY

[0003] The utility model aims at providing a kind of special vehicle fuel tank filler structure, the oil tank filler is sequentially included filler cover, oil filler pipe assembly and welding flange welded on the oil tank top plate oil inlet from oiling end to oil tank oil inlet.

[0004] The oil filler pipe assembly includes vent transition flange, outer tube, flow guide inner tube and mounting flange.

[0005] One end of the outer tube is connected with the welding flange, the other end is connected with the mounting flange, and is marked as A end.

[0006] The connection between the outer tube and the mounting flange is also provided with a vent transition flange, and the vent transition flange is located in the inner hole of the outer tube.

[0007] The flow guide inner tube is arranged in the inner hole of the outer tube, and one end is connected with the inner wall of the vent transition flange, and the other end is connected with the welding flange.

[0008] A sandwich layer is sandwiched between the outer tube and the flow guide inner tube.

[0009] The welding flange is provided with a vent hole penetrating the welding flange, one end of the vent hole is communicated with the inside of the oil tank, and the other end is communicated with the sandwich layer of the oil filler pipe assembly.

[0010] Further, the filler cover is a bidirectional venting filler cover.

[0011] Further, the vent transition flange is provided with a plurality of flanges on the end face facing the outer tube.

[0012] An annular groove penetrating the inner hole of the outer tube is formed on the pipe wall of the outer tube A end.

[0013] The vent transition flange is embedded in the annular groove through the flange.

[0014] Further, a boss is arranged on the outer edge of the mounting flange in a circumferential direction, and the A end of the outer pipe abuts against the boss.

[0015] Further, a welding flange is connected to one end of the outer pipe through a bolt, and a mounting flange is connected to the other end of the outer pipe through a thread.

[0016] Further, a transition flange and a welding flange are connected to two ends of the flow guide inner pipe through welding.

[0017] Further, an annular groove is arranged on the welding flange, and a sealing ring is arranged in the annular groove.

[0018] Further, a filter screen is arranged on the end of the welding flange facing the oil tank.

[0019] The technical effect of the utility model is self-evident, and the beneficial effects of the utility model are as follows.

[0020] 1) The oil filler cap adopts a bidirectional venting oil filler cap, and after assembly, the oil gas pressure difference inside and outside the oil tank can be realized to be not more than 20 kpa, the case that the internal air pressure of the oil tank is too large is prevented, and the reliability of the oil tank body structure is affected; the venting hole is designed in the oil tank oil filler filter screen mounting flange, and the air resistance in the oil tank during high-speed oil gun refueling can be effectively ensured.

[0021] 2) The oil filler pipe adopts a double-layer structure, and the gap between the interlayers is used for mutual ventilation of internal and external air flows.

[0022] 3) The structure is simple and does not occupy space. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an oil tank oil filler structure schematic view;

[0024] Figure 2 It is a venting transition flange structure schematic view;

[0025] In the figure: 1 - oil filler cap; 2 - venting transition flange; 201 - flange; 3 - outer pipe; 4 - flow guide inner pipe; 5 - sealing ring; 6 - welding flange; 601 - venting hole; 7 - filter screen; 8 - mounting flange; 801 - boss; 9 - oil tank top plate. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with examples, but should not be understood as the above-mentioned subject range of the utility model is limited to the following examples. According to ordinary technical knowledge and conventional means in the art, various substitutions and changes are made without departing from the above-mentioned technical ideas of the utility model, and all should be included in the protection scope of the utility model.

[0027] Example 1:

[0028] A special vehicle fuel tank filler port structure, wherein the fuel tank filler port includes, from the filler end to the fuel tank inlet, a filler port cover 1, a filler pipe assembly, and a welded flange 6 welded to the fuel tank top plate 9 fuel inlet.

[0029] One end of the refueling pipe assembly is connected to the refueling port cover 1, and the other end is connected to the welding flange 6.

[0030] The refueling pipe assembly includes a venting transition flange 2, an outer pipe 3, a flow guiding inner pipe 4, and a mounting flange 8.

[0031] One end of the outer tube 3 is connected to the welding flange 6, and the other end is connected to the mounting flange 8, and is referred to as end A.

[0032] The connection between the outer tube 3 and the mounting flange 8 is also provided with a venting transition flange 2, which is located in the inner hole of the outer tube 3.

[0033] The inner guide tube 4 is arranged in the inner hole of the outer tube 3, and one end is connected to the inner wall of the venting transition flange 2, while the other end is connected to the welding flange 6.

[0034] An interlayer is formed between the outer tube 3 and the inner guide tube 4.

[0035] The welding flange 6 is provided with a vent hole 601 that penetrates the welding flange 6. One end of the vent hole 601 is connected to the inside of the oil tank, and the other end is connected to the interlayer of the refueling pipe assembly.

[0036] Example 2:

[0037] The main structure of this embodiment is the same as that of Embodiment 1. Furthermore, the filler cap 1 is a bidirectional venting filler cap. After assembly, the pressure difference between the inside and outside of the fuel tank can be kept below 20 kPa, preventing excessive internal pressure that could affect the reliability of the fuel tank structure.

[0038] Example 3:

[0039] The main structure of this embodiment is the same as any one of embodiments 1 to 2. Furthermore, the end face of the venting transition flange 2 facing the outer pipe 3 is provided with several flanges 201.

[0040] An annular groove penetrating the inner hole of the outer tube is formed on the tube wall at end 3A.

[0041] The venting transition flange 2 is embedded in the annular groove via the flange 201.

[0042] The outer edge of the venting transition flange 2 is welded to the outer pipe 3, and the inner edge is welded to the inner guide pipe 4.

[0043] Example 4:

[0044] The main structure of the embodiment is the same as any one of embodiments 1-3, further, a boss 801 is arranged at the outer edge of the mounting flange 8, the A end of the outer pipe 3 abuts against the boss 801, and the A end of the outer pipe 3 is welded to the mounting flange 8.

[0045] Embodiment 5:

[0046] The main structure of the embodiment is the same as any one of embodiments 1-4, further, one end of the outer pipe 3 is connected with the welding flange 6 through a bolt, and the other end is connected with the mounting flange 8 through a thread.

[0047] Embodiment 6:

[0048] The main structure of the embodiment is the same as any one of embodiments 1-5, further, both ends of the flow guide inner pipe 4 are connected with the transition flange 2 and the welding flange 6 through welding.

[0049] Embodiment 7:

[0050] The main structure of the embodiment is the same as any one of embodiments 1-6, further, an annular groove is arranged on the welding flange 6, and a sealing ring 5 is arranged in the annular groove.

[0051] Embodiment 8:

[0052] The main structure of the embodiment is the same as any one of embodiments 1-7, further, a filter screen 7 is assembled at one end of the welding flange 6 facing the oil tank.

[0053] Embodiment 9:

[0054] The main structure of the embodiment is the same as any one of embodiments 1-8, further, the structure mainly consists of a filler cap, a ventilation transition flange, an outer pipe, a flow guide inner pipe, a sealing ring, a welding flange with a ventilation hole, and a filler cap filter screen.

[0055] The filler cap adopts a filler cap with bidirectional ventilation, and after assembly, the oil gas pressure difference inside and outside the oil tank can be less than 20 kpa, preventing the oil tank from having an excessively large internal air pressure, and affecting the reliability of the oil tank body structure.

[0056] The filler cap filter screen mounting flange is designed with a ventilation hole, which can effectively ensure that no air resistance is formed inside the oil tank during high-speed oil gun refueling.

[0057] The filler pipe adopts a double-layer structure, and the gap between the double layers is used for air flow exchange between the inside and outside.

[0058] The structure is simple and does not occupy space.

[0059] Embodiment 10:

[0060] The main structure of the embodiment is the same as any one of embodiments 1-9, and further, the oil filler structure mainly consists of an oil filler cap, a ventilation transition flange, an outer pipe, a flow guide inner pipe, a sealing ring, a welding flange with a ventilation hole, and an oil filler screen.

[0061] Among them, the oil filler cap, the oil filler pipe assembly and the oil filler screen adopt a mounting method.

[0062] The oil filler screen is installed in the groove of the welding flange with a ventilation hole, the oil filler pipe assembly is connected with the welding flange with a ventilation hole through bolts, and the end face sealing is realized by using the sealing ring.

[0063] The oil filler assembly is welded by the ventilation transition flange, the outer pipe, the flow guide inner pipe, and the oil filler cap screw seat and the mounting flange.

[0064] Among them, the outer pipe, the flow guide inner pipe and the ventilation transition flange form a sandwich for ventilation after welding.

[0065] The welding flange with a ventilation hole is welded on the end face of the top deck of the oil tank.

[0066] When refueling, the airflow inside the oil tank flows to the sandwich of the oil filler assembly through the ventilation hole on the welding flange with a ventilation hole, and then is discharged to the atmosphere, which can effectively avoid the risk that the oil film formed during refueling hinders the discharge of the gas inside the oil tank, thereby affecting the oil filling speed and the problems of oil overflow and oil return.

Claims

1. A special vehicle fuel tank filler neck structure, characterized by: The oil tank filler port comprises, from the filler end to the oil tank inlet, a filler cap (1), a filler pipe assembly and a welding flange (6) welded on the oil tank top plate (9) inlet; The filler pipe assembly comprises a venting transition flange (2), an outer pipe (3), a flow guide inner pipe (4) and a mounting flange (8); One end of the outer pipe (3) is connected with the welding flange (6), and the other end is connected with the mounting flange (8), and is marked as an A end; The connection between the outer pipe (3) and the mounting flange (8) is further provided with the venting transition flange (2), and the venting transition flange (2) is located in the inner hole of the outer pipe (3); The flow guide inner pipe (4) is arranged in the inner hole of the outer pipe (3), and one end is connected with the inner wall of the venting transition flange (2), and the other end is connected with the welding flange (6); A cladding layer is cladded between the outer pipe (3) and the flow guide inner pipe (4); The welding flange (6) is provided with a vent hole (601) penetrating through the welding flange (6), one end of the vent hole (601) is in communication with the inside of the oil tank, and the other end is in communication with the cladding layer of the filler pipe assembly.

2. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The filler cap (1) is a bidirectional venting filler cap.

3. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The venting transition flange (2) is provided with a plurality of flanges (201) on the end face facing the outer pipe (3); An annular groove penetrating through the inner hole of the outer pipe is formed on the pipe wall of the A end of the outer pipe (3); The venting transition flange (2) is embedded in the annular groove through the flanges (201).

4. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The mounting flange (8) is provided with a boss (801) on the outer edge in the circumferential direction, and the A end of the outer pipe (3) abuts against the boss (801).

5. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: One end of the outer pipe (3) is connected with the welding flange (6) through a bolt, and the other end is connected with the mounting flange (8) through a thread.

6. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The flow guide inner pipe (4) is connected with the transition flange (2) and the welding flange (6) through welding at both ends.

7. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The welding flange (6) is provided with an annular groove, and a sealing ring (5) is arranged in the annular groove.

8. The fuel filler structure for a special vehicle fuel tank according to claim 1, characterized in that: The welding flange (6) is provided with a filter screen (7) at the end facing the oil tank.

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