Anti-overfill urea tank

Abstract

The application relates to the field of automobile SCR tail gas treatment technology, in particular to a full-prevention urea tank. The full-prevention urea tank comprises a urea tank body, a filling pipe and a float. The urea tank body is provided with a urea filling opening; the filling pipe is fixedly arranged in the urea filling opening; the filling pipe is provided with an exhaust passage; the exhaust passage comprises an inner hole which is axially arranged through the filling pipe and an air outlet hole which is connected with the inner hole and arranged on the part of the filling pipe in the urea tank body; the float is movably arranged on the filling pipe and located in the urea tank body, and the density of the float is smaller than that of the urea solution; the float has a first position and a second position; when the float is in the first position, the urea tank body is connected with the ambient air through the exhaust passage; when the float is in the second position, the exhaust passage is blocked. The full-prevention urea tank is used to solve the problem that the expansion space of the urea tank is easily occupied when urea is manually added, and the urea tank is damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile SCR exhaust treatment technology, and particularly relates to a full-prevention urea tank. BACKGROUND

[0002] The urea supply system is located in the automobile aftertreatment system, and is used for reducing the content of harmful nitrogen oxides in automobile exhaust. When the urea system works, the urea is quantitatively injected into the aftertreatment device by the urea pump to generate harmless nitrogen and water. The urea tank is a component for storing urea in the SCR system. Since the urea solution will freeze and expand in a low-temperature environment in winter, if the solution in the urea tank is overfilled, the urea solution inside the urea tank will be easily damaged after the volume expansion caused by freezing.

[0003] In the related art, a part of the set expansion space is usually reserved in the urea tank, and a liquid level sensor and other measuring devices are arranged. When it is measured that the urea is filled to 100%, the urea should be stopped. However, this needs to be realized by the expansion space of the urea tank itself and the liquid level sensor. If the liquid level sensor cannot be used in the case of power failure, or when the urea is manually added, the urea is often not immediately stopped when the liquid level sensor alarms, so that the expansion space of the urea tank is occupied by the added urea, which can cause damage to the urea tank. SUMMARY

[0004] Embodiments of the present application provide a full-prevention urea tank to solve the problem that the expansion space of the urea tank is easily occupied when the urea is manually added in the related art, which can cause damage to the urea tank.

[0005] To achieve the above purpose, the embodiments of the present application provide a full-prevention urea tank, which comprises:

[0006] A urea tank body, a urea filling port is formed in the urea tank body;

[0007] A filling pipe is arranged in and fixed in the urea filling port, an exhaust passage is formed in the filling pipe, the exhaust passage comprises an inner hole formed in the axial direction of the filling pipe, and a gas outlet hole in communication with the inner hole, and the gas outlet hole is arranged on the part of the filling pipe located in the urea tank body;

[0008] A float is movably sleeved on the filling pipe and located in the urea tank body, the density of the float is less than the density of the urea solution;

[0009] The float has a first position and a second position, and the float is configured to communicate the urea tank body with the outside air through the exhaust passage when the float is in the first position, and block the exhaust passage when the float is in the second position.

[0010] In some embodiments, the float comprises a connecting section and a sealing section, the connecting section is connected with the sealing section and is located at one end of the sealing section away from the urea filling port, the connecting section is sleeved on the filling pipe and is in gap fit with the filling pipe.

[0011] In some embodiments, it further comprises:

[0012] a sealing plate, which is attached to the inner wall of the urea tank body where the urea filling port is opened;

[0013] The float comprises a connecting section, the connecting section is connected with the sealing section and is located at one end of the sealing section away from the urea filling port, the sealing section is provided with a circular arc surface at one end away from the connecting section, when the float is in the second position, the circular arc surface is attached to the sealing plate, and a sealed cavity is formed between the sealing section and the sealing plate.

[0014] In some embodiments, the sealing section is a circular truncated cone, the upper base of the sealing section is connected with the connecting section, and the lower base of the sealing section is attached to the sealing plate.

[0015] In some embodiments, the circular arc surface is made of elastic material.

[0016] In some embodiments, it further comprises:

[0017] a sealing plate, which is attached to the inner wall of the urea tank body where the urea filling port is opened, and is provided with a threaded connection platform at one end away from the upper surface of the urea tank body;

[0018] The filling pipe comprises a threaded section, and the sealing plate is connected with the threaded section through the threaded connection platform.

[0019] In some embodiments, the filling pipe comprises:

[0020] a sliding section, which is provided at one end of the threaded section, and the float is sleeved on the sliding section;

[0021] a boss, which is provided at one end of the threaded section away from the sliding section, the diameter of the boss is greater than the diameter of the air hole, and the boss abuts against one side of the upper surface of the urea tank body away from the float.

[0022] In some embodiments, the diameter of the threaded section is greater than the diameter of the sliding section, and the air hole is opened on the threaded section.

[0023] In some embodiments, the float comprises a connecting section and a sealing section, the sealing section is used to connect with the urea filling port, the connecting section is connected with the sealing section and is located at one end of the sealing section away from the urea filling port, the connecting section is sleeved on the sliding section and is in gap fit with the sliding section;

[0024] The limiting head is arranged at one end of the sliding section away from the threaded section, and has a diameter greater than the inner diameter of the connecting section.

[0025] In some embodiments, the boss is hexagonal.

[0026] The technical scheme provided by the application has the beneficial effects of:

[0027] The application provides a full-prevention urea tank. Since the filling pipe is hollow and arranged in the urea filling opening of the urea tank body, the filling pipe is located in the urea tank body and movably sleeved on the filling pipe. Since the density of the float is less than the density of the urea solution, the float floats on the urea liquid surface and moves up and down with the change of the height of the liquid surface.

[0028] The float has a first position and a second position. In the first position, the urea solution in the urea tank body is not full, the float is not in contact with the inner wall of the upper surface of the urea tank body, and the exhaust passage is in a communication state. At this time, the external air passes through the inner hole and is communicated with the air in the urea tank body through the air outlet hole. The urea solution is poured into the urea tank body from the filling pipe. In the second position, the float floats up due to the rising of the liquid surface and is in contact with the inner wall of the upper surface of the urea tank body, thereby forming a sealing surface with the inner wall of the upper surface of the urea tank body to prevent the air in the urea tank body from being communicated with the outside through the air outlet hole and the inner hole. Since the air in the urea tank body cannot be exhausted during the urea filling, the air pressure in the urea tank body is increased, and thus the urea solution cannot be added into the urea tank body, so that the expansion space above the liquid surface in the urea tank body is ensured to be 100% full of liquid, the design filling requirement is met, and thus the problem that the expansion space of the urea tank is easily occupied during manual addition of urea in the related art, thereby causing damage to the urea tank, is solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0030] Figure 1 The application provides a schematic diagram of the float in the urea tank body in the half-liquid state of the full-prevention urea tank.

[0031] Figure 2 The application provides a schematic diagram of the float in the urea tank body in the full-liquid state of the full-prevention urea tank.

[0032] Figure 3 The application provides a schematic diagram of the filling pipe, the sealing plate and the float.

[0033] Figure 4 A schematic diagram of the filling pipe provided by the embodiment of the present application is shown in the figure;

[0034] Figure 5 A schematic diagram of the float provided by the embodiment of the present application is shown in the figure.

[0035] In the figure: 1, urea tank body; 2, filling pipe; 21, inner hole; 22, air outlet hole; 23, interface section; 24, boss; 25, threaded section; 26, sliding section; 27, limiting head; 3, sealing plate; 31, threaded connection table; 4, float; 41, connection section; 42, sealing section; 421, circular arc surface; 422, upper bottom surface; 423, lower bottom surface. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] The embodiment of the present application provides a full-prevention urea tank, which can solve the problem that the expansion space of the urea tank is easily occupied when urea is manually added, leading to damage of the urea tank.

[0038] Referring to Figures 1 to 5 The embodiment of the present application provides a full-prevention urea tank, which includes a urea tank body 1 provided with a urea filling port, a filling pipe 2 and a float 4. Specifically, the filling pipe 2 is arranged in and fixed in the urea filling port, and an exhaust passage is arranged in the filling pipe 2. When the exhaust passage is communicated, the urea solution can be poured into the urea tank body 1 through the filling pipe 2. When the exhaust passage is closed, the urea solution cannot be poured into the urea tank body 1 due to the pressure difference between the inside and outside of the urea tank body 1, i.e., the pouring is stopped.

[0039] Further, referring to Figures 1 to 4 The exhaust passage includes an inner hole 21 arranged along the axial direction of the filling pipe 2 and an air outlet hole 22 communicated with the inner hole 21. The air outlet hole 22 is arranged at the part of the filling pipe 2 located in the urea tank body 1.

[0040] Specifically, the filling pipe 2 includes an upper half part located outside the urea tank body 1 and a lower half part located inside the urea tank body 1. The urea solution is poured into the urea tank body 1 through the inner hole 21 of the filling pipe 2. The air outlet hole 22 and the inner hole 21 balance the pressure difference between the inside and outside of the urea tank body 1.

[0041] Further, the float 4 is movably sleeved on the filling pipe 2 and located in the urea tank body 1, the density of the float 4 is less than that of the urea solution, so that the float 4 floats on the surface of the urea solution and rises with the rising of the surface of the urea solution.

[0042] Specifically, the float 4 has a first position and a second position, when the float 4 is in the first position, i.e. Figure 1 As shown, the urea tank body 1 is in communication with the outside air through the exhaust passage, i.e. the air flows through the inner hole 21, the air outlet hole 22 and the urea tank body 1, the air pressure in the urea tank body 1 is consistent with the outside, and the urea solution can be filled into the urea tank body 1 from the filling pipe 2; when the float 4 is in the second position, i.e. Figure 2 As shown, the surface reaches the highest position, the passage between the air outlet hole 22 and the urea tank body 1 is blocked, the exhaust passage is also blocked, the air in the urea tank body 1 cannot communicate with the outside, the air pressure in the urea tank body 1 is inconsistent with the outside, the air in the urea tank body 1 cannot be discharged when the urea solution is filled, which leads to the increase of the air pressure in the urea tank body 1, and the urea solution cannot be filled into the urea tank body 1, so that the filling is stopped.

[0043] The embodiment of the present application provides a urea tank preventing from being filled to the top, since the filling pipe 2 is hollow and is arranged in the urea filling opening of the urea tank body 1, is located in the urea tank body 1 and is movably sleeved on the filling pipe 2, since the density of the float 4 is less than that of the urea solution, the float 4 floats on the surface of the urea solution and moves up and down with the change of the height of the surface.

[0044] The float 4 has a first position and a second position, the first position is the state that the urea solution in the urea tank body 1 is not full, the float 4 does not contact the inner wall of the upper surface of the urea tank body 1, and the exhaust passage is in a communication state, at this time, the outside air passes through the inner hole 21 and communicates with the air in the urea tank body 1 through the air outlet hole 22, and the urea solution is filled into the urea tank body 1 from the filling pipe 2; in the second position, the float 4 floats up due to the rising of the surface of the urea solution, contacts the inner wall of the upper surface of the urea tank body 1 and forms a sealing surface with the inner wall of the upper surface of the urea tank body 1, so as to prevent the air in the urea tank body 1 from communicating with the outside through the air outlet hole 22 and the inner hole 21. Since the air in the urea tank body 1 cannot be discharged when the urea is filled, the air pressure in the urea tank body 1 is increased, and then the urea solution cannot be added into the urea tank body 1, so that the expansion space above the liquid surface when the urea tank body 1 is full of liquid 100% is ensured, the design filling requirement is met, and therefore the problem that the expansion space of the urea tank is easily occupied when the urea is manually added in the related art, which leads to the damage of the urea tank, can be solved.

[0045] In some optional embodiments, as shown in Figures 1 to 4 When the float 4 floats up to contact the inner wall of the upper surface of the urea tank body (as shown in Figure 2As shown, the distance between the liquid surface and the upper wall of the urea tank 1 is the first safety distance, and the space between the liquid surface and the upper wall of the urea tank 1 is the reserved first expansion space. At this time, the urea solution in the urea tank 1 is close to 100% full, preferably greater than 99% and less than 100%.

[0046] The distance between the upper edge of the vent 22 and the upper wall of the urea tank 1 is the second safety distance, which is smaller than the first safety distance. When the liquid level in the urea tank 1 rises to overflow the vent 22, the exhaust channel will also be blocked. At this time, the urea tank 1 is 100% full, and the space between the liquid level and the upper wall of the urea tank 1 is the reserved second expansion space, which is smaller than the first expansion space. When the float 4 is damaged or other conditions occur, the exhaust channel can also be blocked, serving as a second line of defense.

[0047] In some alternative embodiments, see Figures 1 to 3 ,as well as Figure 5 As shown, the float 4 includes a connecting section 41 and a sealing section 42. The connecting section 41 is connected to the sealing section 42, and the connecting section 41 is located at the end of the sealing section 42 away from the urea filling port.

[0048] Furthermore, the connecting section 41 is fitted onto the filling pipe 2 and has a clearance fit with the filling pipe 2. Figure 5 As shown, the connecting section 41 of the float 4 is a hollow cylindrical structure. The connecting section 41 is sleeved on the filling pipe 2 and moves up and down along the filling pipe 2 under the buoyancy of the urea solution and the rising of the liquid level. The reason for the clearance fit between the connecting section 41 and the filling pipe 2 is that the gap reserved between the connecting section 41 and the filling pipe 2 allows the urea solution that enters the float 4 due to the shaking of the liquid surface to be discharged.

[0049] Optionally, in the clearance fit between the connecting section 41 and the filling pipe 2, the diameter difference can be 1 to 4 mm.

[0050] In some alternative embodiments, see Figures 1 to 3 As shown, the anti-overfilling urea tank also includes a sealing plate 3, and the sealing plate 3 is attached to the inner wall of the urea tank body 1 where the urea filling port is opened, that is, the sealing plate 3 is located inside the urea tank body 1.

[0051] Furthermore, combined Figures 1 to 3 ,as well as Figure 5 As shown, the float 4 includes a connecting section 41, which is connected to the sealing section 42 and located at the end of the sealing section 42 away from the urea filling port. Figure 3 and Figure 5As shown in the figure, the sealing section 42 is provided with a circular arc surface 421 at one end away from the connecting section 41. When the float 4 is in the second position, the circular arc surface 421 is in contact with the sealing plate 3, and a sealing cavity is formed between the sealing section 42 and the sealing plate 3, preventing the air in the urea tank body 1 from passing through the air outlet hole 22, and further blocking the exhaust passage, so that the urea solution cannot continue to be filled into the urea tank body 1, achieving the purpose of reserving the expansion space.

[0052] Preferably, in combination with Figures 1 to 3 , and Figure 5 As shown in the figure, the sealing section 42 is a circular truncated cone, which includes an upper base surface 422 and a lower base surface 423. The upper base surface 422 of the sealing section 42 is connected to the connecting section 41, and the diameter of the upper base surface 422 is equal to the diameter of the connecting section 41. The lower base surface 423 of the sealing section 42 is in contact with the sealing plate 3, and one end of the lower base surface 423 away from the upper base surface 422 is a circular arc surface 421.

[0053] Further, the circular arc surface 421 is made of elastic material. When the float 4 floats up with the urea solution to contact the circular arc surface 421 with the sealing plate 3, the circular arc surface is elastically deformed under the upward buoyancy, and forms an annular sealing surface with the sealing plate 3, thereby cutting off the exhaust passage between the air in the urea tank body 1 and the outside, so that the urea solution cannot be filled into the urea tank body 1 from the filling pipe 2.

[0054] Optionally, the circular arc surface 421 can be made of soft silicone or rubber elastic deformation material.

[0055] In some optional embodiments, referring to Figures 1 to 4 As shown in the figure, the anti-overfilling urea tank includes a sealing plate 3, which is attached to the upper wall surface of the urea tank body 1 with a urea filling port, and in combination with Figure 3 As shown in the figure, the sealing plate 3 is provided with a threaded connection table 31 at one end away from the upper surface of the urea tank body 1.

[0056] Further, in combination with Figure 3 and Figure 4 As shown in the figure, the filling pipe 2 includes a threaded section 25, and the sealing plate 3 is connected to the threaded section 25 through the threaded connection table 31. Specifically, the threaded connection table 31 is internally threaded, and the threaded section 25 is externally threaded. The sealing plate 3 is screwed onto the threaded section 25, in combination with Figure 1 and Figure 2 As shown in the figure, by tightening the threaded connection table 31, the sealing plate 3 is attached to the upper wall surface of the urea tank body 1.

[0057] In some optional embodiments, referring to Figure 4 As shown in the figure, the filling pipe 2 includes an interface section 23, a boss 24, a threaded section 25, and a sliding section 26. Specifically, in combination with Figure 1 and Figure 2As shown, the interface section 23 and the boss 24 are arranged outside the urea tank body 1, the interface section 23 is used to provide a guide opening for filling the urea tank body 1 with urea solution, and the boss 24 is connected to the interface section 23 and abuts against the upper wall surface of the urea tank body 1;

[0058] Since the sealing plate 3 is provided with a threaded connection platform 31 at the end away from the upper surface of the urea tank body 1, the sealing plate 3 is threadedly connected to the threaded section 25, the upper wall surface of the urea tank body 1 is clamped between the boss 24 and the sealing plate 3, which plays a role of fixing the filling pipe 2 and the sealing plate 3 to the urea filling opening of the urea tank body 1, and also plays a sealing role to prevent the urea solution in the urea tank body 1 from leaking from the urea filling opening.

[0059] Optionally, the boss 24 and the upper wall surface of the urea tank body 1 also have a transition section therebetween, the diameter of the transition section is smaller than the size of the boss 24 and larger than the size of the urea filling opening, which, while plugging the urea filling opening and achieving the purpose of limiting the filling pipe 2 at the urea filling opening of the urea tank body 1, also facilitates the tool to directly act on the boss 24 to realize the installation and dismounting of the filling pipe 2.

[0060] Further, as shown in Figure 3 and Figure 4 As shown, the boss 24 has a hexagonal structure. Specifically, the outer contour of the boss 24 is hexagonal, which is used as a flange structure for tool tightening and sealing positioning.

[0061] Further, as shown in Figure 4 The sliding section 26 is arranged at the end of the threaded section 25 away from the boss 24, and the float 4 is sleeved on the sliding section 26 and gap-fitted with the sliding section 26.

[0062] Specifically, the gap-fitting of the float 4 with the sliding section 26 is to enable the float 4 to float upward along the axial direction of the sliding section 26 when the float 4 is subjected to the buoyancy and the liquid surface rises, and also to enable the gap between the connecting section 41 and the filling pipe 2 to discharge the urea solution entering the float 4 due to the shaking of the liquid surface.

[0063] Specifically, as shown in Figure 5 The float 4 includes a connecting section 41 and a sealing section 42, wherein the connecting section 41 is connected to the sealing section 42 and located at the end of the sealing section 42 away from the urea filling opening. The connecting section 41 has a hollow cylindrical structure, and the sealing section 42 has a circular truncated cone structure. The connecting section 41 and the sealing section 42 are sleeved on the sliding section 26, and the connecting section 41 is gap-fitted with the sliding section 26, and the gap can be 1-4 mm, and the sealing section 42 is not limited by the gap, as shown in Figure 2As shown, when the float 4 is in the second position, the arc surface 421 is attached to the sealing plate 3, and a sealing cavity is formed between the sealing section 42 and the sealing plate 3, which prevents the air in the urea tank body 1 from passing through the air outlet hole 22, and further blocks the exhaust passage, so that the urea solution cannot continue to be filled into the urea tank body 1, thereby achieving the purpose of reserving the expansion space.

[0064] Further, as shown in Figure 2 and Figure 4 , the diameter of the threaded section 25 is larger than the diameter of the sliding section 26, which on the one hand strengthens the fixation of the filling pipe 2 in the urea tank body 1, and on the other hand can limit the upward movement of the float 4. As shown in Figure 2 , when the float 4 is in the second position, the arc surface 421 is attached to the sealing plate 3.

[0065] Further, the air outlet hole 22 is provided on the threaded section 25. In order to ensure the smoothness of the exhaust passage when the float 4 is not floated to the second position as shown in Figure 2 , the air outlet hole 22 is provided on the threaded section 25 with a larger diameter, that is, as shown in Figure 3 and Figure 4 . Alternatively, two air outlet holes 22 can be provided along the radial direction of the threaded section 25, but they should not be too large, which will cause the threaded connection table 31 to be unable to be connected to the threaded section 25. Preferably, the position of the air outlet hole 22 should avoid the threaded connection of the threaded connection table 31 and the threaded section 25.

[0066] At the same time, in order to prevent the urea solution from overflowing the upper edge of the air outlet hole 22 due to the low position of the air outlet hole 22, which will block the exhaust passage and cause the urea solution to be unable to be filled to 100% when the float 4 is in the second position, the air outlet hole 22 is provided closer to the boss 24, and the air outlet hole 22 is located in the closed cavity formed by the sealing section 42, the filling pipe 2 and the sealing plate 3 when the float 4 is in the second position, thereby ensuring the blocking of the exhaust passage.

[0067] Further, as shown in Figure 4 , the end of the sliding section 26 away from the threaded section 25 is provided with a limiting head 27, which is a limiting structure of the float 4, preventing the float 4 from moving out of the travel range of the float 4 on the filling pipe 2 due to the low level of the urea solution.

[0068] In some optional embodiments, as shown in Figures 1 to 4 , the float 4 includes a connecting section 41 and a sealing section 42, the sealing section 42 is used to connect to the urea filling port, the connecting section 41 is connected to the sealing section 42 and located at the end of the sealing section 42 away from the urea filling port, the connecting section 41 is sleeved on the sliding section 26 and gap-fitted with the sliding section 26.

[0069] Further, as shown in Figure 3 and Figure 4As shown, the sliding section 26 is provided with a limiting head 27 at one end away from the threaded section 25, and the diameter of the limiting head 27 is greater than the inner diameter of the connecting section 41.

[0070] Since the bottom of the filling pipe 2 should be away from the bottom wall of the urea tank body 1 by a distance, in order to prevent the float 4 from falling off due to the continuous lowering of the liquid level of the urea solution due to the use of the urea solution, the filling pipe 2 is provided with a limiting head 27 for limiting the float 4.

[0071] Optionally, the limiting head 27 and the sliding section 26 are in an assembled structure, and specifically, the limiting head 27 and the sliding section 26 are threadedly connected.

[0072] Specifically, when the float 4 is installed, the connecting section 41 of the float 4 is first sleeved into the sliding section 26, and after assembly, the limiting head 27 is connected with the sliding section 26 to form an integrated structure, thereby preventing the float 4 from falling out of the stroke range of the sliding section 26 due to the low liquid level of the urea solution. The assembled structure of the limiting head 27 and the sliding section 26 can be in the form of threaded connection or buckle connection, and the functions are the same.

[0073] Specifically, the application provides an application case. Since the urea tank is installed at a low position of the vehicle chassis, the urea filling port is higher than the urea tank, and the exhaust port is also higher than the urea tank, if there is no overfilling device, when the urea solution is filled, the urea solution will fill the inside of the urea tank, and it is not possible to determine whether the expansion space is reserved, and it is not possible to determine whether the filling of the urea solution should be stopped.

[0074] Since the urea tank is provided with a urea filling port for filling the urea solution, the filling pipe 2, the float 4 and the sealing plate 3 provided in the application can be directly installed to the urea filling port, and when the urea solution is filled, the rising of the float 4 can be sealed, so that when the urea is filled into the remaining space in the urea tank body to reach the expansion space reservation amount, the urea solution cannot be added, that is, the expansion space of the urea tank is reserved, and the safety and reliability of the urea tank are ensured. At the same time, the application only needs to add a few parts to the urea filling port, without the aid of electronic equipment, the structure is easy to realize, easy to produce and manufacture, low in cost, good in effect, and can be used for urea tanks of different volumes, which is beneficial to modular production.

[0075] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0077] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A urea tank designed to prevent overflowing, characterized in that, It includes: The urea tank body (1) has a urea filling port on it; A filling pipe (2) is inserted and fixed in the urea filling port. An exhaust channel is provided in the filling pipe (2). The exhaust channel includes an inner hole (21) that is opened through the filling pipe (2) along the axial direction, and an exhaust hole (22) that is connected to the inner hole (21). The exhaust hole (22) is located in the part of the filling pipe (2) located in the urea tank body (1). A float (4) is movably mounted on the filling pipe (2) and located in the urea tank body (1). The density of the float (4) is less than the density of the urea solution. The float (4) has a first position and a second position. The float (4) is configured such that when the float (4) is in the first position, the urea tank body (1) is connected to the outside air through the exhaust channel; when the float (4) is in the second position, the exhaust channel is blocked. A sealing plate (3) is attached to the inner wall of the urea tank body (1) where the urea filling port is located; The float (4) includes a connecting section (41) and a sealing section (42). The sealing section (42) is used to connect with the urea filling port. The connecting section (41) is connected to the sealing section (42) and is located at the end of the sealing section (42) away from the urea filling port. The connecting section (41) is sleeved on the filling pipe (2) and is in clearance fit with the filling pipe (2). The end of the sealing section (42) away from the connecting section (41) is provided with an arc surface (421). When the float (4) is in the second position, the arc surface (421) is in contact with the sealing plate (3), and a sealing cavity is formed between the sealing section (42) and the sealing plate (3). The sealing section (42) is frustum-shaped. The upper bottom surface (422) of the sealing section (42) is connected to the connecting section (41), and the lower bottom surface (423) of the sealing section (42) is in contact with the sealing plate (3). The arc surface (421) is made of an elastic material.

2. The anti-overfilling urea tank as described in claim 1, characterized in that, It also includes: A threaded connection platform (31) is provided at one end of the sealing plate (3) away from the upper surface of the urea tank body (1). The filling tube (2) includes a threaded section (25), and the sealing plate (3) is connected to the filling tube (2) via a threaded connection platform (31) and the threaded section (25).

3. The anti-overfilling urea tank as described in claim 2, characterized in that, The filling tube (2) includes: A sliding section (26) is provided at one end of a threaded section (25), and the float (4) is sleeved on the sliding section (26); The boss (24) is located at one end of the threaded section (25) away from the sliding section (26) and abuts against the side of the upper surface of the urea tank body (1) away from the float (4).

4. The anti-overfilling urea tank as described in claim 3, characterized in that: The diameter of the threaded section (25) is greater than the diameter of the sliding section (26), and the vent (22) is opened on the threaded section (25).

5. The anti-overfilling urea tank as described in claim 3, characterized in that: The connecting section (41) is sleeved on the sliding section (26) and is in clearance fit with the sliding section (26); A limiting head (27) is provided at the end of the sliding section (26) away from the threaded section (25), and the diameter of the limiting head (27) is larger than the inner diameter of the connecting section (41).

6. The anti-overfilling urea tank as described in claim 3, characterized in that: The boss (24) has a hexagonal structure.

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