A fuel tank suitable for special vehicles

Abstract

The utility model discloses a fuel tank suitable for special vehicle, including box, respirator, expansion chamber, the right side position of box top plate rear end is equipped with the oil filler, the vertical setting expansion chamber in the middle position of the inside front end of box, the top of expansion chamber is fixed on the top plate of box, the top of expansion chamber is equipped with respirator, the bottom of expansion chamber is equipped with gas outlet near the bottom plate position, and the gas outlet is connected to the top of rear end of box through air inlet pipe, air inlet pipe includes the first part that is connected in proper order from the right horizontal extension of gas outlet to the right side plate, the second part that is vertically extended to the top plate near along the right side plate, the third part that is horizontally extended to the rear end plate near along the right side plate and the fourth part that is inclined to the left extension to the left side position of top plate, the utility model discloses through air inlet pipe makes fuel tank when vehicle is 75 DEG, 75 DEG, 25 DEG, 25 DEG, and fuel oil in fuel tank all will not overflow from respirator, can satisfy the demand of special vehicle.

Description

Technical Field

[0001] This utility model relates to a fuel tank suitable for special vehicles. Background Technology

[0002] The operating environment of special vehicles is complex and varied. A certain special vehicle requires that the fuel tank be leak-free within a longitudinal rotation range of ±75° and a left and right tilt range of ±25°. However, the fuel tanks of existing vehicles cannot meet this requirement. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a fuel tank that is simple in structure and reliable in operation, suitable for special vehicles.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A fuel tank suitable for special vehicles includes a tank body, a breather, and an expansion chamber. The tank body is composed of a front end plate, a rear end plate, a left side plate, a right side plate, a top plate, and a bottom plate. A refueling port is provided at the right rear end of the top plate of the tank body. An expansion chamber is vertically arranged in the middle of the front end of the tank body. The top of the expansion chamber is fixed to the top plate of the tank body. A breather is provided at the top of the expansion chamber to maintain the air pressure balance between the inside and outside of the tank body. An air outlet is provided at the bottom of the expansion chamber near the bottom plate. The air outlet is connected to the top of the rear end of the tank body through an air inlet pipe. The air inlet pipe includes a first part that extends horizontally to the right from the air outlet to the right side plate, a second part that extends vertically upward along the right side plate to near the top plate, a third part that extends horizontally backward along the right side plate to near the rear end plate, and a fourth part that extends obliquely upward and to the left to the left side of the top plate.

[0005] The above-mentioned fuel tank applicable to special vehicles includes a breather comprising a valve body, a valve seat, a valve cover, an intake valve, an exhaust valve, and a filter screen. The valve body is a cylindrical structure, with its bottom connected to the expansion chamber. A valve cover is fixedly installed on the top of the valve body, and a filter screen is installed between the top of the valve body and the valve cover. A vent hole is opened on the valve cover. A valve seat is fixedly installed inside the valve body, and the valve seat is sealed to the inner wall of the valve body. The valve seat has a stepped circular hole in the middle, with an intake valve at the top of the circular hole and an exhaust valve on the outer side of the top of the valve seat.

[0006] The above-mentioned fuel tank is applicable to special vehicles. The intake valve includes a base, a valve core, an intake valve body, and a first spring. The intake valve body is fitted inside a circular hole and has a cylindrical structure. The base is fixedly installed inside the lower end of the intake valve body. The base has a through hole in the middle and an annular protrusion at the top of the intake valve body. The valve core is located inside the intake valve body, with its lower end inserted into the through hole in the middle of the base and its upper end abutting against the annular protrusion. The first spring is fitted on the valve core, and its upper and lower ends are fixed to the upper part of the valve core and the base, respectively. An annular groove is circumferentially opened on the lower outer wall of the intake valve body. The inner cavity of the intake valve body and the annular groove are connected to the expansion chamber. The opening pressure of the intake valve is less than 3 kPa.

[0007] The above-mentioned fuel tank is applicable to special vehicles. The exhaust valve includes an exhaust valve body and a second spring. The exhaust valve body is upside down on the top of the intake valve and threadedly connected to the valve seat. The second spring is located in the exhaust valve body. The upper end of the second spring is fixedly connected to the exhaust valve body, and the lower end of the second spring is fixedly connected to the intake valve body. The side wall of the exhaust valve body has a connecting hole. The opening pressure of the exhaust valve is 20 kPa to 25 kPa.

[0008] The above-mentioned fuel tank, applicable to special vehicles, has a fuel level sensor on the left rear end of the top plate of the tank body for detecting the amount of fuel in the tank.

[0009] The aforementioned fuel tank, applicable to special vehicles, has several baffles on its bottom plate to increase the tank's strength and reduce fuel splashing and impact.

[0010] The aforementioned fuel tank, applicable to special vehicles, has a polyurea coating sprayed onto its outer surface.

[0011] The above-mentioned fuel tank, applicable to special vehicles, has several reinforcing plates on its top plate.

[0012] The above-mentioned fuel tank, applicable to special vehicles, has corner protection at all eight corners of the tank body.

[0013] The above-mentioned fuel tank is applicable to special vehicles, wherein the expansion chamber is a circular tube, and the top and bottom of the circular tube are welded to the top plate and bottom plate of the tank body, respectively.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model has an air outlet at the bottom of the expansion chamber near the bottom plate. The air inlet pipe includes a first part that extends horizontally to the right from the air outlet to the right side plate, a second part that extends vertically upward along the right side plate to near the top plate, a third part that extends horizontally backward along the right side plate to near the rear end plate, and a fourth part that extends obliquely upward and to the left to the left side of the top plate. This special structure of the air inlet pipe ensures that fuel in the fuel tank will not overflow from the breather when the vehicle is tilted forward 75°, backward 75°, left 25°, or right 25°, thus meeting the needs of special vehicles.

[0016] 2. This utility model has several partitions on the bottom plate of the box, which can increase the strength of the box and reduce fuel splashing and impact.

[0017] 3. The respirator of this utility model adopts an intake valve + exhaust valve structure, which can prevent fuel leakage in the fuel tank and has good safety. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention.

[0019] Figure 2 for Figure 1 Top view.

[0020] Figure 3 This is a schematic diagram of a respirator.

[0021] Figure 4 This is a schematic diagram of the intake valve and exhaust valve.

[0022] Figure 5 This is a schematic diagram of the present invention in a horizontal state.

[0023] Figure 6 This is a schematic diagram of the present invention when the vehicle is tilted forward at 75°.

[0024] Figure 7 This is a schematic diagram of the present invention in a 75° backward tilted state with the vehicle.

[0025] Figure 8 This is a schematic diagram of the present invention when the vehicle is tilted 25° to the left.

[0026] Figure 9 This is a schematic diagram of the present invention when the vehicle is tilted 25° to the right. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 , Figure 2As shown, a fuel tank suitable for special vehicles includes a tank body 10, a breather 12, and an expansion chamber 13. The tank body 10 is composed of a front end plate 1, a rear end plate 2, a left side plate, a right side plate, a top plate, and a bottom plate. A fuel filler port 11 for adding fuel is provided at the right rear end of the top plate of the tank body 10. An expansion chamber 13 is vertically arranged at the middle of the front end of the tank body 10. The top of the expansion chamber 13 is fixed to the top plate of the tank body 10. A breather 12 for maintaining the air pressure balance between the inside and outside of the tank body 10 is provided at the top of the expansion chamber 13. An air outlet is provided at the bottom of the expansion chamber 13 near the bottom plate. The air outlet is connected to the top of the rear end of the tank body 10 through an air inlet pipe 14. The air inlet pipe 14 includes a first part 141 extending horizontally to the right from the air outlet to the right side plate, a second part 142 extending vertically upward along the right side plate to near the top plate, a third part 143 extending horizontally backward along the right side plate to near the rear end plate 2, and a fourth part 144 extending obliquely upward and to the left to the left side of the top plate.

[0029] A fuel level sensor 7 for detecting the fuel level inside the tank 10 is located on the left rear end of the top plate of the tank 10. Several baffles 9 are provided on the bottom plate of the tank 10 to increase its strength and reduce fuel splashing and impact. A polyurea coating 6 is sprayed onto the outer surface of the tank 10 to enhance the sealing effect. Several reinforcing plates 4 are provided on the top plate of the tank 10. All eight corners of the tank 10 are reinforced with corner protectors 8. The expansion chamber 13 is a circular tube, with its top and bottom welded to the top and bottom plates of the tank 10, respectively.

[0030] like Figure 3 As shown, the respirator 12 includes a valve body 19, a valve seat 5, a valve cover 15, an inlet valve 18, an exhaust valve 17, and a filter screen 16. The valve body 19 has a cylindrical structure, and the bottom of the valve body 19 is connected to the expansion chamber 13. The valve cover 15 is fixedly installed on the top of the valve body 19. A filter screen 16 is provided between the top of the valve body 19 and the valve cover 15. A vent hole 3 is opened on the valve cover 15. The valve seat 5 is fixedly installed inside the valve body 19 and is sealed to the inner wall of the valve body 19. The valve seat 5 has a stepped circular hole in the middle, and an inlet valve 18 is provided at the top of the circular hole. An exhaust valve 17 is provided on the outer side of the top of the valve seat 5.

[0031] like Figure 4As shown, the intake valve 18 includes a base 20, a valve core 21, an intake valve body 22, and a first spring. The intake valve body 22 is sleeved in a circular hole and has a cylindrical structure. The base 20 is fixedly installed inside the lower end of the intake valve body 22, and the base 20 has a through hole in the middle. An annular protrusion 23 is provided on the top of the intake valve body 22. The valve core 21 is located inside the intake valve body 22, with its lower end inserted into the through hole in the middle of the base 20 and its upper end tightly abutting against the annular protrusion 23. The first spring is sleeved on the valve core 21, and its upper and lower ends are respectively... The valve core 21 is fixed on the upper part of the valve core 21 and the base 20. The lower outer wall of the intake valve body 22 has an annular groove 24. The inner cavity of the intake valve body 22 and the annular groove 24 are connected to the expansion chamber 13. The opening pressure of the intake valve 18 is less than 3 kPa. If the opening pressure of the intake valve 18 is reached, the valve core 21 will move downward against the elastic force of the first spring. The upper end of the valve core 21 will separate from the annular protrusion 23. The external gas will pass through the vent hole 3 on the valve cover 15 and the connecting hole of the exhaust valve 17 to the inside of the exhaust valve 17, and then enter the expansion chamber 13 from the inner cavity of the intake valve body 22 to realize the intake.

[0032] The exhaust valve 17 includes an exhaust valve body 25 and a second spring. The exhaust valve body 25 is upside down on top of the intake valve 18 and threadedly connected to the valve seat 5. The second spring is located inside the exhaust valve body 25, with its upper end fixedly connected to the exhaust valve body 25 and its lower end fixedly connected to the intake valve body 22. The exhaust valve body 25 has a connecting hole on its side wall. The opening pressure of the exhaust valve 17 is 20 kPa to 25 kPa. The exhaust valve 17 is used for system exhaust and can also ensure that the expansion chamber 13 is filled with air, separating the fuel in the fuel tank from the breather 12. If the opening pressure of the exhaust valve 17 is reached, the intake valve body 22 moves upward against the elastic force of the second spring, and the annular groove 24 moves upward to communicate with the interior of the exhaust valve body 25, thereby discharging the gas through the connecting hole of the exhaust valve 17 and the vent hole 3 on the valve cover 15.

[0033] When the fuel system is working normally, the fuel tank is under negative pressure due to the suction of the fuel pump. There is air between the breather 12 and the fuel in the fuel tank (air in the expansion chamber 13 and the intake pipe 14). Considering that the fuel system has multiple fuel tanks, i.e., there is an external fuel tank connected to this fuel tank, when the fuel level in the external fuel tank is higher than that in this fuel tank, fuel from the external fuel tank will flow into this fuel tank. When the fuel level in this fuel tank is higher than any part of the intake pipe 14, the fuel in the tank will slowly flow into the expansion chamber 13 along the intake pipe 14. However, when the fuel in the expansion chamber 13 submerges the air inlet of the intake pipe 14, because the opening pressure of the exhaust valve 17 in the breather 12 is 20kPa to 25kPa, while the pressure in the fuel tank is lower than 15kPa (the pressure generated by the highest liquid level in the fuel system relative to the liquid level in the breather 12), the fuel in the fuel tank will no longer flow into the expansion chamber 13, the fuel level in the expansion chamber 13 will no longer rise, and fuel will not come out of the breather 12.

[0034] The working principle of this utility model is as follows: when refueling the fuel tank, no fuel is allowed to be added into the expansion chamber 13, and at the same time, 10% of the space at the top of the fuel tank will be left unfilled.

[0035] When the fuel tank is in a horizontal position with the vehicle, from Figure 5 As can be seen, the air inlet of the breather 12 is located at the top of the fuel tank, so fuel in the fuel tank will not overflow from the breather 12.

[0036] When the fuel tank tilts forward 75°, such as Figure 6 The attitude diagram shown is from Figure 6 As can be seen, the air outlet of the air intake pipe 14 is located at the top of the fuel tank, so fuel in the fuel tank will not overflow from the breather 12.

[0037] When the fuel tank tilts backward by 75°, such as Figure 7 The attitude diagram shown is from Figure 7 As can be seen, the air inlet of the breather 12 is located at the top of the fuel tank, so fuel in the fuel tank will not overflow from the breather 12.

[0038] When the fuel tank tilts 25° to the left with the vehicle, such as Figure 8 The attitude diagram shown is from Figure 8 As can be seen, the angled part of the air intake pipe 14 is located at the top of the fuel tank, so the fuel in the fuel tank will not overflow from the breather 12.

[0039] When the fuel tank tilts 25° to the right with the vehicle, such as Figure 9 The state diagram of the shown posture, from Figure 9 As can be seen, the air outlet of the air intake pipe 14 is located at the top of the fuel tank, so fuel in the fuel tank will not overflow from the breather 12.

Claims

1. A fuel tank suitable for special vehicles, characterized in that: The device includes a housing, a respirator, and an expansion chamber. The housing is composed of a front panel, a rear panel, a left panel, a right panel, a top panel, and a bottom panel. An oil filler is located at the right rear end of the top panel. An expansion chamber is vertically positioned in the middle of the front end of the housing. The top of the expansion chamber is fixed to the top panel of the housing. A respirator is located at the top of the expansion chamber to maintain pressure balance between the inside and outside of the housing. An air outlet is located at the bottom of the expansion chamber near the bottom panel. The air outlet is connected to the top of the rear end of the housing via an air inlet pipe. The air inlet pipe includes a first part that extends horizontally to the right from the air outlet to the right panel, a second part that extends vertically upward along the right panel to near the top panel, a third part that extends horizontally backward along the right panel to near the rear end panel, and a fourth part that extends obliquely upward and to the left to the left side of the top panel.

2. The fuel tank for special vehicles according to claim 1, characterized in that: The respirator includes a valve body, a valve seat, a valve cover, an inlet valve, an exhaust valve, and a filter screen. The valve body has a cylindrical structure, with the bottom of the valve body communicating with the expansion chamber. A valve cover is fixedly installed on the top of the valve body, and a filter screen is installed between the top of the valve body and the valve cover. A vent hole is opened on the valve cover. A valve seat is fixedly installed inside the valve body, and the valve seat is sealed to the inner wall of the valve body. The valve seat has a stepped circular hole in the middle, an inlet valve is installed at the top of the circular hole, and an exhaust valve is installed on the outer side of the top of the valve seat.

3. The fuel tank for special vehicles according to claim 2, characterized in that: The intake valve includes a base, a valve core, an intake valve body, and a first spring. The intake valve body is fitted inside a circular hole and has a cylindrical structure. The base is fixedly installed inside the lower end of the intake valve body, with a through hole in the middle. An annular protrusion is provided at the top of the intake valve body. The valve core is located inside the intake valve body, with its lower end inserted into the through hole in the middle of the base and its upper end abutting against the annular protrusion. The first spring is fitted on the valve core, with its upper and lower ends fixed to the upper part of the valve core and the base, respectively. An annular groove is circumferentially formed on the lower outer wall of the intake valve body, and both the inner cavity of the intake valve body and the annular groove are connected to the expansion chamber. The opening pressure of the intake valve is less than 3 kPa.

4. The fuel tank for special vehicles according to claim 3, characterized in that: The exhaust valve includes an exhaust valve body and a second spring. The exhaust valve body is upside down on the top of the intake valve and threaded onto the valve seat. The second spring is located inside the exhaust valve body. The upper end of the second spring is fixedly connected to the exhaust valve body, and the lower end of the second spring is fixedly connected to the intake valve body. A connecting hole is opened on the side wall of the exhaust valve body. The opening pressure of the exhaust valve is 20 kPa to 25 kPa.

5. The fuel tank for special vehicles according to claim 1, characterized in that: An oil level sensor for detecting the amount of oil inside the box is located on the left rear end of the top plate of the box.

6. The fuel tank for special vehicles according to claim 1, characterized in that: The bottom plate of the container is provided with several baffles to increase the strength of the container and reduce fuel splashing and impact.

7. The fuel tank for special vehicles according to claim 1, characterized in that: The outer surface of the enclosure is coated with a polyurea coating.

8. The fuel tank for special vehicles according to claim 1, characterized in that: The top plate of the box is provided with several reinforcing plates.

9. The fuel tank for special vehicles according to claim 1, characterized in that: All eight corners of the box are reinforced with corner protectors.

10. The fuel tank for special vehicles according to claim 1, characterized in that: The expansion chamber is a circular tube, with its top and bottom welded to the top and bottom plates of the housing, respectively.

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