Urea box filling port plug cover

Abstract

The utility model provides a urea box filling port plug cover which comprises a cover body detachably connected with a filling port of a urea box, an air blowing film is connected to the inner wall of the cover body, a breathing cavity is formed between the air blowing film and the bottom of the cover body, and a breathing hole communicated with the breathing cavity is formed in the side wall of the cover body. An inner sealing ring and an outer sealing ring are arranged on the two sides, away from the air blowing film, of the inner wall of the cover body respectively, and a plurality of vent holes are formed in the air blowing film and located between the inner sealing ring and the outer sealing ring. An elastic rubber sealing ring is arranged on the side, away from the air-blowing film, of the outer sealing ring, a plurality of arc-shaped connecting strips are arranged on the inner wall, close to the opening, of the cover body, one end of each arc-shaped connecting strip gradually inclines towards the air-blowing film in the arc-shaped direction of the arc-shaped connecting strip, and a limiting protrusion is arranged at the end, closest to the air-blowing film, of each arc-shaped connecting strip. Self-adaptive breathing can be achieved according to the air pressure condition in the urea box, internal air pressure balance is maintained, the situation that the plug cover is difficult to open can be prevented, and the urea box mechanism can be prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea filling, and relates to a filling port plug cover for a urea tank. Background Technique

[0002] With the improvement of environmental protection awareness globally and the increasing strictness of relevant regulations, the requirement for reducing harmful substances in diesel engine emissions, especially nitrogen oxides (NO X ) has become more urgent. Selective catalytic reduction (SCR) technology, as an effective method for reducing NO X emissions, has been widely applied in heavy-duty diesel vehicles. The core of this technology lies in using an aqueous urea solution (also known as diesel exhaust fluid or DEF) to convert NO in the exhaust gas X into harmless nitrogen and water.

[0003] The aqueous urea solution needs to be added to the vehicle's urea tank through a specially designed filling system. The filling pipe assembly of the urea tank, as a key component connecting the urea tank and external filling equipment, its design is directly related to whether the urea solution can be safely and effectively stored and filled. The traditional filling pipe assembly of the urea tank generally consists of a filling port, a sealing cover, and a pipe connecting the urea tank, and may include additional functional components such as an anti-overflow device and a filter to ensure that impurities do not enter the interior of the urea tank and affect the quality of the urea solution.

[0004] However, in practical applications, the filling pipe assembly of the urea tank faces some challenges. First, after multiple fillings or long-term use, the consumption of the urea solution in the urea tank will cause the internal air pressure of the tank to drop. When the pressure difference between the inside and outside is large, this may make it difficult for the user to open the filling cover during the next filling. Second, under cold climate conditions, the urea solution will crystallize when approaching -11°C. The crystallization will cause the volume of the solution to expand and increase the pressure inside the tank. If no measures are taken to release the pressure, it may cause structural damage to the urea tank. Content of the Utility Model

[0005] The purpose of the utility model is to provide a filling port plug cover for a urea tank, which can breathe adaptively according to the air pressure in the urea tank, maintain the internal air pressure balance, prevent the plug cover from being difficult to open, and prevent damage to the urea tank mechanism.

[0006] To solve the above technical problems, the utility model provides a filling port plug for a urea tank, which comprises a cover body detachably connected to the filling port of the urea tank. An air-inflating film with good elasticity and plasticity is connected to the inner wall of the cover body. A breathing cavity is formed between the air-inflating film and the bottom of the cover body. A breathing hole communicating with the breathing cavity is formed in the side wall of the cover body. An inner sealing ring is arranged on the inner wall of the cover body on the side of the air-inflating film away from its opening, and an outer sealing ring is arranged on the inner wall of the cover body on the side of the air-inflating film close to its opening. A plurality of ventilation holes are formed in the air-inflating film between the inner sealing ring and the outer sealing ring. When the air-inflating film is deformed by air pressure and bulges inwards or outwards, the ventilation holes can extend out between the inner sealing ring and the outer sealing ring.

[0007] An elastic rubber sealing ring is arranged on the side of the outer sealing ring away from the air-inflating film. A sealing sleeve ring with the same outer diameter as the filling port of the urea tank is arranged on the inner wall of the cover body at the outer sealing ring and extends towards its opening. A plurality of arc-shaped connecting strips distributed circumferentially are arranged on the inner wall of the cover body near its opening. One end of each arc-shaped connecting strip gradually inclines towards the air-inflating film along its arc direction, and a limiting protrusion is arranged at the end of each arc-shaped connecting strip closest to the air-inflating film.

[0008] By adopting the above technical scheme, when the cover body is covered on the filling port, the cover body is pressed on the filling port and then rotated, so that the arc-shaped connecting strips slide along the clamping strips on the outer wall of the filling port until the limiting protrusions are clamped in the clamping grooves. At this time, the elastic rubber sealing ring is tightly pressed on the edge of the filling port to form a seal. When it is necessary to remove the cover body, first press the cover body forcefully to compress the elastic rubber sealing ring, so that the limiting protrusions are disengaged from the clamping grooves, and then the cover body can be rotated in the reverse direction to be removed.

[0009] When the urea solution is used up, the air pressure in the urea tank becomes smaller, and the external air pressure pushes the air-inflating film to bulge inwards, so that the ventilation holes leak out from between the sealing ring and the outer sealing ring. The outside air enters the urea tank through the breathing hole, the breathing cavity and the ventilation holes to maintain the internal and external air pressure balance.

[0010] When the urea solution crystallizes in a low-temperature environment and causes the air pressure in the urea tank to rise, the internal air pressure pushes the air-inflating film to bulge outwards, so that the ventilation holes leak out. The air in the urea tank is discharged to the outside through the ventilation holes, the breathing cavity and the breathing hole to maintain the internal and external air pressure balance.

[0011] The utility model is further provided that a twisting strip is arranged at the end of the cover body away from its opening.

[0012] The utility model is further provided that the air-inflating film is made of latex material.

[0013] The utility model is further provided that the inner edge of the sealing sleeve ring close to the opening of the cover body is chamfered.

[0014] The utility model is further configured such that the elastic rubber sealing ring is made of silicone rubber material.

[0015] The utility model is further configured such that the thickness of the elastic rubber sealing ring is 0.5 - 0.8 cm.

[0016] The utility model is further configured such that a lanyard connecting ring is provided on the outer edge of the open end of the cover body.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] Firstly, in the utility model, an air - inflating film is provided in the plug cover, and ventilation holes are provided at the edge of the air - inflating film. When the air - inflating film is inflated or deflated inward or outward under air pressure, the ventilation holes can extend due to stretching deformation, allowing air to enter or exit the urea tank, maintaining the air pressure balance inside and outside the urea tank, preventing the plug cover from being difficult to open, and preventing damage to the urea tank mechanism.

[0019] Secondly, in the utility model, an arc - shaped connecting strip is provided in the plug cover to replace the traditional threaded connection. Cooperating with the elastic rubber sealing ring, the connection can be completed without turning a full circle, which is convenient and fast in operation, and the lanyard will not affect the turning of the plug cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is used to show the internal structure of the cover body;

[0022] Figure 3 is a cross - sectional view of the utility model;

[0023] Figure 4 is used to show the ventilation holes on the air - inflating film.

[0024] Among them, 1. Cover body; 2. Turning strip; 3. Lanyard connecting ring; 4. Air - inflating film; 5. Respiratory cavity; 6. Respiratory hole; 7. Inner sealing ring; 8. Outer sealing ring; 9. Ventilation hole; 10. Elastic rubber sealing ring; 11. Sealing sleeve ring; 12. Arc - shaped connecting strip; 13. Limit protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further details a urea tank filling port plug cover proposed by the utility model in conjunction with the attached drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the attached drawings are all in a very simplified form and use non - precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0026] Example, refer to Figures 1-4 , a filling port plug for a urea tank, comprising a cover body 1 detachably connected to the filling port of the urea tank. One end of the cover body 1 away from its opening is provided with a twisting strip 2. An outer side of the opening end of the cover body 1 is provided with a lanyard connection ring 3, which is convenient for connecting the plug to the adjacent vehicle body through the lanyard to prevent it from falling. An inner wall of the cover body 1 is connected with a bulging film 4 made of latex material with good elasticity and plasticity. A breathing cavity 5 is formed between the bulging film 4 and the bottom of the cover body 1. A plurality of breathing holes 6 communicating with the breathing cavity 5 are opened on a side wall of the cover body 1. An inner sealing ring 7 is arranged on the inner wall of the cover body 1 on a side of the bulging film 4 away from its opening, and an outer sealing ring 8 is arranged on the inner wall of the cover body 1 on a side of the bulging film 4 close to its opening. Neither the inner sealing ring 7 nor the outer sealing ring 8 is connected to the bulging film 4. A plurality of ventilation holes 9 are opened on the bulging film 4 between the inner sealing ring 7 and the outer sealing ring 8. When the bulging film 4 bulges or deforms inward or outward under air pressure, the ventilation holes 9 can extend out between the inner sealing ring 7 and the outer sealing ring 8, so that when the internal and external air pressures are unbalanced, air can enter or exhaust through the ventilation holes 9.

[0027] On a side of the outer sealing ring 8 away from the bulging film 4, a circle of elastic rubber sealing ring 10 made of silicone rubber material is arranged. The thickness of the elastic rubber sealing ring 10 is 0.5 - 0.8 cm, so that the elastic rubber sealing ring 10 can be pressed and compressed. A sealing sleeve ring 11 with an inner diameter the same as the outer diameter of the filling port of the urea tank is arranged on the inner wall of the cover body 1 at the outer sealing ring 8 and extends towards its opening direction. An inner edge of the sealing sleeve ring 11 close to one end of the opening of the cover body 1 is chamfered. Three arc-shaped connecting strips 12 distributed in a circumferential manner are arranged on the inner wall of the cover body 1 close to its opening. On an outer wall of the filling port of the urea tank, there are clamping strips corresponding to the arc-shaped connecting strips 12 one by one. One end of each arc-shaped connecting strip 12 gradually inclines towards the direction of the bulging film 4 along its arc direction, and a limit protrusion 13 is arranged at the end of each arc-shaped connecting strip 12 closest to the bulging film 4. There are clamping grooves corresponding to the limit protrusions 13 on the clamping strips on the outer wall of the filling port.

[0028] Working principle: When covering the cover body 1 on the filling port, press the cover body 1 on the filling port and twist the cover body 1, so that the arc-shaped connecting strips 12 slide along the clamping strips on the outer wall of the filling port until the limit protrusions 13 are stuck in the clamping grooves. At this time, the elastic rubber sealing ring 10 tightly presses on the edge of the filling port to form a seal. When it is necessary to remove the cover body 1, first press the cover body 1 hard to compress the elastic rubber sealing ring 10, so that the limit protrusions 13 are disengaged from the clamping grooves, and then the cover body 1 can be twisted in the reverse direction to remove it;

[0029] When the urea solution is used, the air pressure in the urea tank becomes smaller, and the external air pressure pushes the air-blowing film 4 to bulge inward, causing the ventilation hole 9 to leak out from between the sealing ring and the outer sealing ring 8. The outside air enters the urea tank through the breathing hole 6, the breathing cavity 5, and the ventilation hole 9 to maintain the air pressure balance inside and outside of it.

[0030] When the urea solution crystallizes in a low-temperature environment, resulting in an increase in the air pressure in the urea tank, the internal air pressure pushes the air-blowing film 4 to bulge outward, causing the ventilation hole 9 to leak out. The air in the urea tank is discharged to the outside through the ventilation hole 9, the breathing cavity 5, and the breathing hole 6 to maintain the air pressure balance inside and outside of it.

[0031] It should be noted that the various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0032] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the protection scope of the claims.

Claims

1. A urea tank filling port plug cover, comprising a cover body (1) detachably connected to the filling port of the urea tank, characterized in that, An inner wall of the cover body (1) is connected with an air-inflating film (4) having good elasticity and plasticity. A breathing cavity (5) is formed between the air-inflating film (4) and the bottom of the cover body (1). A breathing hole (6) communicating with the breathing cavity (5) is formed in a side wall of the cover body (1). An inner sealing ring (7) is arranged on the inner wall of the cover body (1) on a side of the air-inflating film (4) far from its opening. An outer sealing ring (8) is arranged on the inner wall of the cover body (1) on a side of the air-inflating film (4) close to its opening. A plurality of ventilation holes (9) are formed in the air-inflating film (4) between the inner sealing ring (7) and the outer sealing ring (8). When the air-inflating film (4) is inflated or deflated inward or outward under air pressure and deformed, the ventilation holes (9) can extend out between the inner sealing ring (7) and the outer sealing ring (8). An elastic rubber sealing ring (10) is arranged on a side of the outer sealing ring (8) far from the air-inflating film (4). A sealing sleeve ring (11) having an inner diameter same as an outer diameter of a filling port of the urea tank is arranged on the inner wall of the cover body (1) at the outer sealing ring (8) and extends in a direction of its opening. A plurality of arc-shaped connecting bars (12) distributed in a circumferential manner are arranged on the inner wall of the cover body (1) close to its opening. One end of each arc-shaped connecting bar (12) gradually inclines in an arc direction towards the air-inflating film (4), and a limiting protrusion (13) is arranged at one end of each arc-shaped connecting bar (12) closest to the air-inflating film (4).

2. The urea tank filling port plug cover according to claim 1, characterized in that, A screwing bar (2) is arranged at an end of the cover body (1) far from its opening outside the cover body (1).

3. The urea tank filling port plug cover according to claim 1, characterized in that, The air-inflating film (4) is made of latex material.

4. The urea tank filler neck plug cover according to claim 1, characterized in that, An inner edge of one end of the sealing sleeve ring (11) close to the opening of the cover body (1) is chamfered.

5. The urea tank filler neck plug cover according to claim 1, characterized in that, The elastic rubber sealing ring (10) is made of silicone rubber material.

6. The urea tank filler neck plug cover according to claim 5, characterized in that, The elastic rubber sealing ring (10) has a thickness of 0.5 - 0.8 cm.

7. The urea tank filling port plug cover according to claim 1, characterized in that, A hanging rope connecting ring (3) is arranged on an outer edge of an opening end of the cover body (1).

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