Urea box filling pipe assembly

Abstract

The utility model provides a urea box filling pipe assembly which comprises a filling pipe connected with a urea box and a filling cover detachably connected with the filling pipe, an inner supporting sleeve is arranged in the middle of the inner wall of the filling pipe, and a plurality of air outlet holes distributed circumferentially are formed in the inner supporting sleeve. The filling cover comprises an end cover, a connecting ring matched with the inner wall of the filling cover, and a hollow plug matched with the inner wall of the inner supporting sleeve; the middle of the end, away from the end cover, of the hollow plug is provided with an air vent, the end, close to the end cover, of the hollow plug is provided with an interlayer connected with the connecting ring, the interlayer is provided with a plurality of air inlet holes distributed circumferentially, the side, away from the end cover, of the interlayer is connected with an air inlet hole blocking rubber ring covering the air inlet holes, and the interlayer is provided with a plurality of exhaust holes distributed circumferentially. The side, close to the end cover, of the interlayer is connected with an exhaust hole blocking rubber ring covering the exhaust hole, and a through hole is formed in the end cover in a penetrating mode. The self-adaptive exhaling urea box can realize self-adaptive exhaling according to the air pressure condition in the urea box, can prevent the cover from being difficult to open, and can also prevent the urea box mechanism from being damaged.

Description

Technical Field

[0001] The utility model belongs to the field of automobile urea tank structures and relates to a urea tank filling pipe assembly. Background Art

[0002] With increasingly stringent environmental regulations, selective catalytic reduction (SCR) technology is widely used in heavy-duty diesel vehicles to reduce nitrogen oxides (NOx) in diesel engine emissions. This technology relies on the use of an aqueous urea solution (also known as diesel exhaust fluid, or DEF), which is added to the vehicle's urea tank via a urea tank filler pipe assembly. The urea tank filler pipe assembly is a key component connecting the urea tank to the external filling equipment, and its design is crucial to ensuring efficient storage and filling of the urea solution.

[0003] Existing urea tank filling pipe assemblies typically consist of a filling port, a sealing cap, and piping connecting to the urea tank. To facilitate filling, these filling pipe assemblies may also be equipped with overflow prevention devices and filters to prevent impurities from entering the urea tank. However, in actual use, especially after frequent filling or prolonged use, the urea solution in the urea tank can cause the internal pressure to drop. This drop in pressure can make it difficult for the operator to open the cap during the next filling due to the pressure difference between the internal and external pressures.

[0004] Furthermore, urea solution may crystallize in low-temperature environments. Since the crystallization temperature of urea solution is approximately -11°C, below this temperature, the urea in the solution will gradually crystallize and form a solid, causing volume expansion. This expansion not only increases the pressure inside the urea tank but, if appropriate measures are not taken to release this pressure, may also cause structural damage to the tank. Utility Model Content

[0005] The purpose of the utility model is to provide a urea tank filling pipe assembly, which can adaptively exhale according to the air pressure in the urea tank to maintain internal air pressure balance, thereby preventing the lid from being difficult to open and preventing damage to the urea tank mechanism.

[0006] In order to solve the above technical problems, the utility model provides a urea tank filling pipe assembly, a filling pipe connected to the urea tank, and a filling cap detachably connected to the filling pipe, an inner support sleeve is provided from the middle of the inner wall of the filling pipe toward the tail end thereof, the diameter of the inner support sleeve gradually decreases toward the tail end of the filling pipe, a filling port is formed inwardly at the free end of the inner support sleeve, a plurality of circumferentially distributed air outlet holes are opened on the inner support sleeve, the filling cap includes an end cap, a connecting ring connected to the end cap and matched with the inner wall of the filling cap, and a hollow plug connected to the connecting ring and matched with the inner wall of the inner support sleeve;

[0007] The hollow plug is provided with an air vent in the middle portion of one end away from the end cover, the hollow plug is provided with a partition connected to the connecting ring at one end close to the end cover, the partition is provided with a plurality of circumferentially distributed air inlet holes, the side of the partition away from the end cover is connected with an air inlet blocking rubber ring covering the air inlet holes, the air inlet blocking rubber ring is connected to the partition on only one side, the partition is provided with a plurality of circumferentially distributed exhaust holes outside the air inlet blocking rubber ring, the side of the partition close to the end cover is connected with an exhaust blocking rubber ring covering the exhaust holes, the exhaust blocking rubber ring is connected to the partition on only one side, and a through hole is provided through the end cover.

[0008] By adopting the above technical solution, when adding urea solution, the solution in the urea tank increases, and the gas inside it is discharged from the air outlet on the inner support sleeve, maintaining the internal air pressure balance, which facilitates smooth addition of urea solution;

[0009] After the urea solution is used, the air pressure in the urea tank decreases, and the air pressure pushes the rubber ring of the air inlet plug hole to deform and open the air inlet hole. Air enters the urea tank through the through hole, air inlet hole and vent to maintain the balance of air pressure inside and outside.

[0010] When the urea solution crystallizes in a low-temperature environment and causes the air pressure in the urea tank to rise, the air pressure pushes the exhaust plugging rubber ring to deform and open the exhaust hole. The internal gas is discharged from the vent, exhaust hole and through hole to maintain the internal and external air pressure balance.

[0011] The present invention is further configured such that the outer wall of the connecting ring is provided with an external thread, and the inner wall of the filling pipe is provided with an internal thread threadedly connected to the connecting ring.

[0012] The utility model is further configured such that the free end of the hollow plug is provided with a first rubber sealing ring that cooperates with the edge of the filling port, and the edge of the hollow plug close to one end of the end cover is provided with a second rubber sealing ring that cooperates with the inner wall of the inner support sleeve, so that the air outlet is located between the first rubber sealing ring and the second rubber sealing ring.

[0013] The present invention is further configured such that an outer support ring is provided on the outer wall of the filling pipe near the end cover.

[0014] The utility model is further configured such that an outer sleeve ring is provided on the edge of the end cover toward the hollow plug.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the utility model can only open the air intake when the air pressure in the urea tank drops by cooperating with the air intake hole and the air intake blocking rubber ring, thereby maintaining the internal and external air pressure balance and preventing the lid from being difficult to open due to excessive internal air pressure;

[0017] Secondly, the utility model can only open the exhaust when the air pressure in the urea tank rises through the cooperation between the exhaust hole and the exhaust hole blocking rubber ring, thereby maintaining the balance of internal and external air pressure and preventing the internal air pressure from being too high and causing damage to the urea tank mechanism;

[0018] Third, by opening an air vent on the inner support sleeve, the air vent will not be blocked when adding urea solution. During the process of increasing the solution in the urea tank, gas can be discharged from the air vent to maintain internal air pressure balance, which facilitates smooth addition of urea solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 Used to demonstrate the connection between the filling pipe and the filling cap;

[0021] Figure 3 is a partial cross-sectional view of the filling cap;

[0022] Figure 4 It is a partial cross-sectional view used to show the exhaust hole.

[0023] Among them, 1. filling pipe; 2. inner support sleeve; 3. filling port; 4. air outlet; 5. end cover; 6. connecting ring; 7. hollow plug; 8. first rubber sealing ring; 9. second rubber sealing ring; 10. outer support ring; 11. outer ring; 12. vent; 13. partition; 14. air inlet; 15. air inlet plugging rubber ring; 16. air exhaust hole; 17. air exhaust plugging rubber ring; 18. through hole. DETAILED DESCRIPTION

[0024] The following is a detailed description of the urea tank filling pipe assembly proposed by the present invention, combined with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention. Identical or similar reference numerals in the drawings represent identical or similar components.

[0025] Example, see Figure 1-4A urea tank filling pipe assembly includes a filling pipe 1 connected to the urea tank and a filling cap detachably connected to the filling pipe 1. An inner support sleeve 2 is provided from the middle of the inner wall of the filling pipe 1 toward its tail end. The diameter of the inner support sleeve 2 gradually decreases toward the tail end of the filling pipe 1. A filling port 3 is formed inwardly at the free end of the inner support sleeve 2. When adding urea solution, the pipe is inserted from the filling port 3. The inner support sleeve 2 is provided with a plurality of circumferentially distributed air outlet holes 4. When adding urea solution, the solution in the urea tank increases, forcing the gas inside out of the air outlet holes 4. The filling cap includes an end cap 5, a connecting ring 6 connected to the end cap 5 and mating with the inner wall of the filling cap, and a hollow plug 7 connected to the connecting ring 6 and mating with the inner wall of the inner support sleeve 2.

[0026] The outer wall of the connecting ring 6 is provided with an external thread, and the inner wall of the filling pipe 1 is provided with an internal thread that is threadedly connected to the connecting ring 6. The free end of the hollow plug 7 is provided with a first rubber sealing ring 8 that cooperates with the edge of the filling port 3. The edge of the hollow plug 7 near the end of the end cap 5 is provided with a second rubber sealing ring 9 that cooperates with the inner wall of the inner support sleeve 2. The air outlet 4 is located between the first rubber sealing ring 8 and the second rubber sealing ring 9. When the hollow plug 7 is connected, a seal is formed between the hollow plug 7 and the inner support sleeve 2, preventing air or liquid from leaking through the gap therebetween. The outer wall of the filling pipe 1 is provided with an outer support ring 10 near the end cap 5. The outer support ring 10 is arranged on the outer wall of the urea tank. The edge of the end cap 5 is provided with an outer ring 11 toward the hollow plug 7 to increase the area of ​​the end cap 5 and facilitate pinching the end cap 5 by hand.

[0027] A vent 12 is provided in the middle of the end of the hollow plug 7 away from the end cover 5. The end of the hollow plug 7 close to the end cover 5 is a partition 13 connected to the connecting ring 6. The partition 13 is provided with six air inlet holes 14 distributed in a circle. The side of the partition 13 away from the end cover 5 is connected to a circle of air inlet blocking rubber ring 15 covering the air inlet holes 14. The air inlet blocking rubber ring 15 is connected to the partition 13 on only one side, so that the internal pressure of the urea tank is low. When the air pressure pushes the air inlet blocking rubber ring 15 from the outside to the inside, the air inlet holes 14 can be opened to intake air, and otherwise closed. The partition 13 has six circumferentially distributed exhaust holes 16 outside the air inlet plugging rubber ring 15. A circle of exhaust plugging rubber rings 17 covering the exhaust holes 16 is connected to the side of the partition 13 near the end cap 5. Only one side of the exhaust plugging rubber ring 17 is connected to the partition 13. When the high pressure inside the urea tank pushes the exhaust plugging rubber ring 17 from the inside out, the exhaust holes 16 can open to allow air in, and vice versa. A through hole 18 is formed through the end cap 5.

[0028] Working principle: When adding urea solution, the solution in the urea tank increases, and the gas inside it is discharged from the air outlet 4 on the inner support sleeve 2, maintaining the internal air pressure balance, which facilitates smooth addition of urea solution;

[0029] After the urea solution is used, the air pressure in the urea tank decreases, and the air pressure pushes the air inlet plugging rubber ring 15 to deform and open the air inlet hole 14. Air enters the urea tank through the through hole 18, the air inlet hole 14 and the vent 12, maintaining the internal and external air pressure balance.

[0030] When the urea solution crystallizes in a low-temperature environment and causes the air pressure in the urea tank to rise, the air pressure pushes the exhaust plugging rubber ring 17 to deform and open the exhaust hole 16, and the internal gas is discharged from the vent 12, the exhaust hole 16 and the through hole 18 to maintain the internal and external air pressure balance.

[0031] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0032] The above description is only a description of the preferred embodiment of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A urea tank filling pipe assembly, a filling pipe (1) connected to the urea tank, and a filling cap detachably connected to the filling pipe (1), characterized in that: An inner support sleeve (2) is provided in the middle of the inner wall of the filling pipe (1) toward the tail end thereof, the diameter of the inner support sleeve (2) gradually decreases toward the tail end of the filling pipe (1), a free end of the inner support sleeve (2) forms a filling port (3) inwardly, the inner support sleeve (2) is provided with a plurality of circumferentially distributed air outlet holes (4), and the filling cap comprises an end cap (5), a connecting ring (6) connected to the end cap (5) and matched with the inner wall of the filling cap, and a hollow plug (7) connected to the connecting ring (6) and matched with the inner wall of the inner support sleeve (2); The hollow plug (7) is provided with an air vent (12) in the middle of one end away from the end cover (5), the end of the hollow plug (7) close to the end cover (5) is a partition (13) connected to the connecting ring (6), the partition (13) is provided with a plurality of air inlet holes (14) distributed in a circumferential manner, the side of the partition (13) away from the end cover (5) is connected to an air inlet hole blocking rubber ring (15) covering the air inlet holes (14), and the air inlet hole blocking rubber ring (15) is provided to cover the air inlet holes (14). The ring (15) is connected to the spacer (13) at only one side, and the spacer (13) is provided with a plurality of circumferentially distributed exhaust holes (16) outside the air inlet plugging rubber ring (15). An exhaust plugging rubber ring (17) covering the exhaust holes (16) is connected to the side of the spacer (13) close to the end cover (5). The exhaust plugging rubber ring (17) is connected to the spacer (13) at only one side, and a through hole (18) is provided through the end cover (5).

2. The urea tank filling pipe assembly according to claim 1, characterized in that: The outer wall of the connecting ring (6) is provided with an external thread, and the inner wall of the filling pipe (1) is provided with an internal thread threadedly connected to the connecting ring (6).

3. The urea tank filling pipe assembly according to claim 1, characterized in that: The free end of the hollow plug (7) is provided with a first rubber sealing ring (8) that matches the edge of the filling port (3), and the edge of the hollow plug (7) close to one end of the end cover (5) is provided with a second rubber sealing ring (9) that matches the inner wall of the inner support sleeve (2), so that the air outlet (4) is located between the first rubber sealing ring (8) and the second rubber sealing ring (9).

4. The urea tank filling pipe assembly according to claim 1, characterized in that: An outer support ring (10) is provided on the outer wall of the filling pipe (1) near the end cover (5).

5. The urea tank filling pipe assembly according to claim 1, characterized in that: An outer ring (11) is provided on the edge of the end cover (5) toward the hollow plug (7).

Images