Combined ventilation structure of urea tank and remote filling assembly

Abstract

The invention relates to a combined ventilation structure of a urea tank and a remote filling component, which comprises a tank body, a filling ventilation component and an exhaust pipe. The tank body is provided with a receiving cavity for receiving urea solution, the urea solution in the receiving cavity has a maximum liquid level, the filling ventilation component comprises a filling pipe and a filling seat that can be opened and closed, the filling pipe has a liquid inlet end and a liquid outlet end, when the filling seat is closed, an air flow channel connected to the outside is still retained, the liquid outlet end is connected with the receiving cavity, a vent hole is opened at the liquid outlet end above the maximum liquid level, the exhaust pipe has an air inlet end and an exhaust end, the air inlet end is connected with the receiving cavity, the liquid outlet position of the liquid outlet end and the maximum air inlet position of the air inlet end are arranged flush with the maximum liquid level in the receiving cavity, and the exhaust end is connected to the filling seat. The invention solves the problems in the prior art that the ventilation structure of the urea tank has too many components, increases the mold process, increases the manufacturing difficulty and cost, and occupies a large space.

Description

Technical Field

[0001] The present invention relates to the technical field of urea tanks, and in particular to a combined ventilation structure of a urea tank and a remote filling component. Background Art

[0002] With the update of automobile technology, the requirements for urea supply system are becoming more and more. On the one hand, sufficient urea volume is required to meet the exhaust gas purification function and vehicle layout. On the other hand, installation and maintenance are required to be more convenient and cost-effective. Therefore, a series of urea tanks, urea filling and ventilation structures have emerged. In order to ensure the normal supply of urea solution during normal driving of the vehicle, the existing urea tank needs to maintain the pressure balance in the urea tank and make a structure that is always open to the atmosphere on the urea tank body. For example, the Chinese utility model patent with patent application number CN201822003238.6 proposes an integrated urea tank for pickup truck exhaust gas treatment system, which includes a urea tank body with a lower opening structure, and the inner edge of the lower opening of the urea tank body is spaced apart. An upper clip is provided, and a lower clip is provided on the outer edge of the mounting seat of the urea pump. The urea tank body is fixed to the mounting seat as a whole through the upper and lower clips. The urea tank body is provided with an exhaust joint, a liquid injection joint and a one-way vent valve. The one-way vent valve is provided with a vent pipe whose outer end is connected to the atmosphere. The urea tank body is provided with a first lifting ear and a second lifting ear. A liquid level sensor is provided on the mounting seat boss located in the urea tank body through a bracket, and is connected to a heating plate and a temperature and quality integrated sensor through a wire. The vent valve structure in the above technical solution increases the number of components of the entire urea tank, increases the cost, and takes up space. At the same time, in the manufacture of the urea tank, it is necessary to reserve a vent valve and a vent pipe, increase the mold process, and further increase the manufacturing cost.

[0003] Therefore, the ventilation structure of the urea tank in the prior art has the disadvantages of having too many components, increasing the mold process, increasing the manufacturing difficulty and cost, and occupying a large space. Summary of the Invention

[0004] In view of this, it is necessary to provide a combined ventilation structure of a urea tank and a remote filling assembly to solve the problem in the prior art that the ventilation structure of the urea tank has too many components, increases the mold process, increases the manufacturing difficulty and cost, and occupies a large space.

[0005] The venting device is a device for distributing liquid to a user, wherein the venting device is a device for distributing liquid to a user, and the like. The venting device is a device for distributing liquid to a user, wherein the venting device is a device for distributing liquid to a user, and the like. The venting device is a device for distributing liquid to a user, and the like.

[0006] Furthermore, the liquid outlet is a filling joint, one end of which is connected to the filling pipe, and the other end extends through the top of the tank body into the accommodating cavity. The filling joint is hollow and is used to connect the accommodating cavity and the filling pipe.

[0007] Furthermore, the air inlet end is an exhaust joint, which is hollow, one end of the exhaust joint is connected to the exhaust pipe, and the other end extends through the side wall of the tank body into the accommodating cavity, and the top surface of the inner wall of the exhaust joint in the accommodating cavity and the lowest surface of the filling joint are both located on the highest liquid level.

[0008] Furthermore, the exhaust pipe and the filling pipe are close to each other and extend in the same direction, and the exhaust pipe and the outer peripheral wall of the filling pipe are relatively fixed.

[0009] Furthermore, the exhaust pipe and the filling pipe are extended in a generally downward direction from the filling seat to the tank body, and the exhaust pipe and the filling pipe are smoothly arranged.

[0010] Furthermore, the filling seat is configured as a hollow cylindrical structure with openings at both ends, one end being connected to the filling pipe and the other end being detachably fixed with a filling cap, and the exhaust end of the exhaust pipe being connected to the interior of the filling seat via the side wall of the filling seat.

[0011] Furthermore, the filling cap includes a support frame and an outer cover. The support frame is detachably fixed to one end of the filling seat away from the filling pipe. The outer cover is fixedly sleeved on the support frame. The support frame is hollow. There is a gap between the outer cover and the support frame to form an air flow channel.

[0012] Furthermore, a breathable membrane for preventing liquid from passing through is fixedly provided in the support frame in a direction perpendicular to the axis thereof.

[0013] Furthermore, a connecting piece is provided between the filling cap and the filling seat, and both ends of the connecting piece are provided as annular structures, and both ends of the annular structure of the connecting piece are respectively sleeved on the outer periphery of the filling seat and the outer periphery of the filling cap.

[0014] Furthermore, the inner diameter of the vent hole is less than or equal to one third of the inner diameter of the filling connector.

[0015] Compared with the prior art, the combined ventilation structure of a urea tank and a remote filling assembly provided by the present invention replaces the ventilation valve and ventilation pipe structure in the prior art by providing the filling ventilation assembly and the exhaust pipe, thereby reducing the number of ventilation structures and mold processes, reducing the difficulty and cost of manufacturing the urea tank, and avoiding the effect of occupying the top space of the urea tank; specifically, there is a accommodating cavity in the tank body, and the urea solution in the accommodating cavity has a maximum liquid level; the filling ventilation assembly includes a filling pipe and a filling seat that can be opened and closed, and the exhaust pipe has an air inlet end and an exhaust end. When urea is filled, the exhaust pipe is used to discharge the gas in the urea tank, so that the urea solution can be discharged. The solution can smoothly enter the accommodating cavity through the filling pipe. When the urea solution is filled to the highest liquid level, the urea solution submerges the air inlet end of the exhaust pipe. At the same time, the liquid outlet end of the filling pipe is also sealed by the urea solution. At this time, the gas in the urea tank cannot be discharged, and the filling gun for filling the urea tank automatically jumps to stop filling the urea solution, ensuring the expansion volume in the urea tank. After the filling is completed, the filling seat can be closed to prevent dirt from entering the urea tank and to prevent the urea solution from leaking. At the same time, an air flow channel is still retained between the closed filling seat and the outside world to balance the pressure inside and outside the urea tank, thereby ensuring the normal supply of urea solution when the vehicle is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of the overall structure of an embodiment of a combined ventilation structure of a urea tank and a remote filling assembly provided by the present invention;

[0017] Figure 2 A partial cross-sectional schematic diagram of a urea tank in an embodiment of the combined ventilation structure of a urea tank and a remote filling assembly provided by the present invention;

[0018] Figure 3 A schematic structural diagram of a filling cap in one embodiment of a combined ventilation structure of a urea tank and a remote filling assembly provided by the present invention;

[0019] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0020] In the figure: 1. Tank body; 2. Filling and ventilation assembly; 3. Exhaust pipe; 11. Accommodating cavity; 12. Maximum liquid level; 21. Filling pipe; 22. Filling seat; 221. Filling cap; 2211. Support frame; 2212. Outer cover; 2213. Breathable membrane; 222. Connector; 23. Filling connector; 231. Vent hole; 31. Exhaust connector. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0022] For ease of understanding, the application scenario of the combined ventilation structure of the urea tank and remote filling assembly is first described, such as Figure 1 As shown, when the urea tank in the present invention is filled with urea solution, the filling seat 22 needs to be opened and the filling gun is inserted into the filling seat 22 for filling, so that the urea solution flows into the urea tank through the filling pipe 21. The filling gun used in the present invention is a common filling gun on the market. During filling, it can absorb the gas discharged from the urea tank into the filling seat 22, so that the urea solution can smoothly enter the urea tank. At the same time, it can respond to the increase in pressure in the urea tank. When the pressure in the urea tank rises, it can automatically jump the gun to terminate the filling.

[0023] like Figure 1-2 As shown, a combined ventilation structure of a urea tank and a remote filling assembly in this embodiment includes a tank body 1, a filling ventilation assembly 2 and an exhaust pipe 3. The tank body 1 has a receiving cavity 11 for accommodating urea solution. The urea solution in the receiving cavity 11 has a maximum liquid level 12. The filling ventilation assembly 2 includes a filling pipe 21 and a filling seat 22 that can be opened and closed. The filling pipe 21 has a liquid inlet end and a liquid outlet end. The filling seat 22 is fixed on the liquid inlet end. The filling seat 22 is closed. When the tank body 1 is filled with liquid, an air flow channel communicating with the outside world is still left. The liquid outlet end is fixed on the tank body 1 and is communicated with the accommodating cavity 11. The liquid outlet end is provided with a vent hole 231 above the highest liquid level 12. The exhaust pipe 3 has an air inlet end and an exhaust end. The air inlet end is fixed on the tank body 1 and is communicated with the accommodating cavity 11. The liquid outlet position of the liquid outlet end and the highest air inlet position of the air inlet end are flush with the highest liquid level 12 in the accommodating cavity 11, and the exhaust end is connected to the filling seat 22.

[0024] Among them, the tank body 1 is the shell of the urea tank, and its interior is hollow to form a receiving cavity 11 for accommodating urea solution. The urea solution has a maximum liquid level 12 when filling, and the maximum liquid level 12 maintains a certain distance from the top of the urea tank to ensure the expansion volume in the urea tank; the filling vent assembly 2 is used to remotely fill the urea tank and maintain the balance of air pressure inside and outside the urea tank. The filling vent assembly 2 includes a filling pipe 21 and a filling seat 22 that can be opened and closed. The filling seat 22 is fixed on the liquid inlet end of the filling pipe 21, and the liquid outlet end of the filling pipe 21 extends into the receiving cavity 11. When filling the urea solution, the filling seat 22 is opened, and the filling is carried out by inserting the filling gun into the filling seat 22, so that the urea solution enters the receiving cavity 11 through the filling pipe 21. After filling, the filling seat 22 can be closed to prevent dirt from entering the urea tank and the urea solution. The liquid flows out, and when the filling seat 22 is closed, there is still an air flow channel connected to the outside world. A vent hole 231 for ventilation is further opened at the highest liquid level of the liquid outlet end. The air pressure in the urea tank is kept balanced with the external air pressure through the vent hole 231, the filling pipe 21 and the air flow channel on the filling seat 22; the exhaust pipe 3 is used to discharge the gas in the urea tank when the urea solution is added to the urea tank. The exhaust pipe 3 has an air inlet end and an exhaust end. The air inlet end is connected to the accommodating cavity 11, and the exhaust end is connected to the filling seat 22. When the urea solution is added, the gas in the urea tank is discharged through the exhaust pipe 3, the filling seat 22 and the filling gun. The highest air inlet position of the air inlet end of the exhaust pipe 3 and the liquid outlet end of the filling pipe 21 are located on the same horizontal plane, which is the highest liquid level 12. The position of the highest liquid level 12 changes according to the height of the air inlet end of the exhaust pipe 3 and the liquid outlet end of the filling pipe 21.

[0025] It is understandable that when the urea solution is added, the liquid level of the urea solution continues to rise. When the liquid level of the urea solution rises to the same level as the highest air inlet position of the air inlet end of the exhaust pipe 3 and the liquid outlet end of the filling pipe 21, the urea solution submerges the air inlet end of the exhaust pipe 3. At the same time, the liquid outlet end of the filling pipe 21 is also sealed by the urea solution. At this time, the gas in the urea tank cannot be discharged, and the filling gun filling the urea tank automatically jumps to stop adding the urea solution, thereby ensuring the expansion volume in the urea tank. At this time, the urea solution in the accommodating cavity 11 is at the highest liquid level 12.

[0026] In this embodiment, the filling vent assembly 2 includes a filling pipe 21 and a filling seat 22. The filling vent assembly 2 is used to fill urea solution into the urea tank and balance the air pressure inside and outside the urea tank, thereby ensuring the normal supply of urea solution when the vehicle is running.

[0027] In order to facilitate the connection between the filling pipe 21 and the urea tank, in a preferred embodiment, as shown in FIG. Figure 2As shown, the liquid outlet end is a filling connector 23, one end of the filling connector 23 is connected to the filling pipe 21, and the other end extends through the top of the tank body 1 into the accommodating cavity 11. The filling connector 23 is hollow and is used to connect the accommodating cavity 11 and the filling pipe 21.

[0028] The filling connector 23 is fixedly connected to the urea tank, and the filling connector 23 and the filling pipe 21 can be fixed in a detachable manner to facilitate installation and replacement of the filling pipe 21 during maintenance.

[0029] In order to ensure the expansion volume in the tank, in a preferred embodiment, the inner diameter of the vent hole 231 is less than or equal to one third of the inner diameter of the filling connector 23 .

[0030] It is understandable that when the liquid level in the urea tank is at the highest level, if the size of the vent hole 231 is too large, too much urea solution will enter the urea tank, which will reduce the expansion volume in the urea tank.

[0031] In order to avoid interference between filling and exhaust, in a preferred embodiment, as Figure 1 As shown, the filling seat 22 is configured as a hollow cylindrical structure with openings at both ends. One end is connected to the filling pipe 21, and a filling cap 221 is detachably fixed to the other end. The exhaust end of the exhaust pipe 3 is connected to the interior of the filling seat 22 via the side wall of the filling seat 22.

[0032] The filling gun injects urea solution into the filling pipe 21 from the end of the filling seat 22, and the gas discharged from the urea tank flows from the side wall of the filling seat 22 to the exhaust channel of the filling gun. The two do not interfere with each other, ensuring smooth filling.

[0033] In order to prevent urea liquid from flowing out or dirt from entering the urea tank, in a preferred embodiment, Figure 3 As shown, the filling cap 221 includes a support frame 2211 and an outer cover 2212. The support frame 2211 is detachably fixed on the end of the filling seat 22 away from the filling pipe 21. The outer cover 2212 is fixedly mounted on the support frame 2211. The support frame 2211 is hollow, and there is a gap between the outer cover 2212 and the support frame 2211 to form an air flow channel.

[0034] Among them, the support frame 2211 can be threadedly fixed to the liquid inlet end of the filling pipe 21, and an outer cover 2212 is fixedly sleeved on the outside of the support frame 2211. A slight gap is left between the outer cover 2212 and the support frame 2211 to form an air flow channel, so that the gas in the urea tank can communicate with the outside world through the vent 231, the filling pipe 21 and the air flow channel, thereby balancing the internal and external air pressures of the urea tank.

[0035] In order to further prevent the leakage of urea solution, in a preferred embodiment, as Figure 4As shown, a breathable membrane 2213 for preventing liquid from passing through is fixedly provided in the support frame 2211 along a direction perpendicular to its axis.

[0036] The breathable membrane 2213 is a membrane structure that can only pass gas. The setting of the breathable membrane 2213 allows gas to be discharged from the urea tank to the outside to ensure the balance of air pressure inside and outside the urea tank. At the same time, it restricts the urea solution from flowing to the outside through the breathable membrane 2213. Even when the vehicle body is tilted, the urea solution in the urea tank will not leak out, thereby ensuring the reliability of the device during use.

[0037] In order to facilitate opening and closing the filling seat 22, in a preferred embodiment, as shown in FIG. Figure 3 As shown, a connecting piece 222 is provided between the filling cap 221 and the filling seat 22 , and both ends of the connecting piece 222 are provided as annular structures, and both ends of the annular structure of the connecting piece 222 are respectively sleeved on the outer periphery of the filling seat 22 and the outer periphery of the filling cap 221 .

[0038] Among them, due to the setting of the connecting piece 222, the filling cap 221 can still be hung on the filling seat 22 even when it is removed from the filling seat 22, without having to find another place to place the filling cap 221, which facilitates the opening and closing of the filling seat 22 when filling the urea solution.

[0039] In this embodiment, the exhaust pipe 3 is used to discharge the gas in the urea tank during filling, so that the urea solution can smoothly enter the urea tank.

[0040] In a preferred embodiment, Figure 2 As shown, the air inlet end is an exhaust connector 31, which is hollow. One end of the exhaust connector 31 is connected to the exhaust pipe 3, and the other end extends through the side wall of the tank body 1 into the accommodating cavity 11. The top surface of the inner wall of the exhaust connector 31 in the accommodating cavity 11 and the lowest surface of the filling connector 23 are both located above the highest liquid level 12.

[0041] The exhaust connector 31 is fixedly connected to the urea tank, and the exhaust connector 31 and the exhaust pipe 3 can be detachably fixed to facilitate installation and removal of the exhaust pipe 3. At the same time, the lowest surface of the filling connector 23 is flush with the highest liquid level 12 of the urea solution in the urea tank and is also on the same horizontal plane as the topmost surface of the inner diameter of the exhaust connector 31 in the urea tank, so as to ensure that when the urea solution is filled to the highest liquid level 12, the urea solution forms a seal between the exhaust connector 31 and the filling connector 23.

[0042] In order to reduce the space occupied by the exhaust pipe 3, in a preferred embodiment, as shown in FIG. Figure 1 As shown, the exhaust pipe 3 and the filling pipe 21 are close to each other and extend in the same direction, and the outer peripheral walls of the exhaust pipe 3 and the filling pipe 21 are relatively fixed.

[0043] In order to avoid the urea solution flowing directly in the exhaust pipe 3 and the filling pipe 21, in a preferred embodiment, the exhaust pipe 3 and the filling pipe 21 are extended in an overall downward direction from the filling seat 22 to the tank body 1, and the exhaust pipe 3 and the filling pipe 21 are smoothly arranged.

[0044] Compared with the prior art, the combined ventilation structure of the urea tank and the remote filling assembly provided by the present invention replaces the ventilation valve and ventilation pipe structure in the prior art by providing the filling ventilation assembly 2 and the exhaust pipe 3, thereby reducing the number of ventilation structures and mold processes, reducing the difficulty and cost of manufacturing the urea tank, and avoiding occupying the top space of the urea tank.

[0045] At the same time, the expansion volume in the urea tank can be guaranteed. As the urea solution is added, the gas in the urea tank body 1 is compressed, flows to the filling seat 22 through the exhaust pipe 3, and is then absorbed by the gas recovery pipe of the filling gun. When the urea solution added to the urea tank submerges the exhaust joint 31, the urea solution seals the filling joint 23 in the urea tank. At this time, the filling gun, the filling seat 22, the filling pipe 21, and the urea tank body 1 form a closed loop. At this time, the gas in the urea tank cannot be discharged, and the filling gun automatically jumps to stop adding the urea solution, so that the urea solution is added to the set maximum liquid level 12, thereby ensuring the expansion volume in the urea tank.

[0046] The combined ventilation structure of a urea tank and a remote filling assembly provided by the present invention also has the function of balancing the pressure in the urea tank. After filling is completed, the filling gun is removed and the filling cap 221 is installed on the filling seat 22. An air passage that is normally open to the atmosphere is formed through the gap between the vent hole 231 on the filling connector 23 in the urea tank, the filling pipe 21 connector, the filling pipe 21, the filling seat 22, the breathable membrane 2213 in the filling cap 221, the outer cover 2212 of the filling cap 221 and the support frame, thereby balancing the internal and external pressures of the urea tank and ensuring the normal supply of urea solution during operation of the vehicle.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A combined ventilation structure of a urea tank and a remote filling assembly, characterized in that: Including tank body, filling and ventilation assembly and exhaust pipe; The tank body has a cavity for containing urea solution, and the urea solution in the cavity has a maximum liquid level; The filling vent assembly includes a filling pipe and a filling seat that can be opened and closed. The filling pipe has a liquid inlet end and a liquid outlet end. The filling seat is fixedly mounted on the liquid inlet end. When the filling seat is closed, an air flow channel communicating with the outside is still left. The liquid outlet end is fixedly mounted on the top of the tank body and communicates with the accommodating cavity. The liquid outlet end is provided with a vent hole above the highest liquid level. The exhaust pipe has an inlet end and an exhaust end, the inlet end is fixed to the side wall of the tank body and is connected to the accommodating cavity, the liquid outlet position of the liquid outlet end and the highest inlet position of the inlet end are flush with the highest liquid level in the accommodating cavity, and the exhaust end is connected to the filling seat; The liquid outlet is a filling joint, and the lowest surface of the filling joint is located at the highest liquid level; The air inlet end is an exhaust joint, and the top surface of the inner wall of the exhaust joint in the accommodating cavity is located on the highest liquid level.

2. The combined ventilation structure of the urea tank and the remote filling assembly according to claim 1, characterized in that: One end of the filling connector is connected to the filling pipe, and the other end extends through the top of the tank body into the accommodating cavity. The filling connector is hollow and is used to connect the accommodating cavity and the filling pipe.

3. The combined ventilation structure of a urea tank and a remote filling assembly according to claim 2, characterized in that: The exhaust joint is hollow, one end of the exhaust joint is connected to the exhaust pipe, and the other end passes through the side wall of the tank body and extends into the accommodating cavity.

4. The combined ventilation structure of the urea tank and the remote filling assembly according to claim 3, characterized in that: The exhaust pipe and the filling pipe are close to each other and extend in the same direction. The exhaust pipe and the outer peripheral wall of the filling pipe are relatively fixed.

5. The combined ventilation structure of the urea tank and the remote filling assembly according to claim 4, characterized in that: The exhaust pipe and the filling pipe are extended from the filling seat to the tank body in an overall downward direction, and the exhaust pipe and the filling pipe are smoothly arranged.

6. The combined ventilation structure of the urea tank and the remote filling assembly according to any one of claims 1 to 5, characterized in that: The filling seat is configured as a hollow cylindrical structure with openings at both ends. One end is connected to the filling pipe, and a filling cap is detachably fixed to the other end. The exhaust end of the exhaust pipe is connected to the interior of the filling seat via the side wall of the filling seat.

7. A combined ventilation structure of a urea tank and a remote filling assembly according to claim 6, characterized in that: The filling cap includes a support frame and an outer cover. The support frame is detachably fixed to one end of the filling seat away from the filling pipe. The outer cover is fixedly sleeved on the support frame. The support frame is hollow. There is a gap between the outer cover and the support frame to form an airflow channel.

8. The combined ventilation structure of a urea tank and a remote filling assembly according to claim 7, characterized in that: A breathable membrane for preventing liquid from passing through is fixedly arranged in the support frame along a direction perpendicular to the axis thereof.

9. A combined ventilation structure of a urea tank and a remote filling assembly according to claim 8, characterized in that: A connecting piece is provided between the filling cap and the filling seat. Both ends of the connecting piece are provided as annular structures. Both ends of the annular structure of the connecting piece are respectively sleeved on the outer periphery of the filling seat and the outer periphery of the filling cap.

10. The combined ventilation structure of a urea tank and a remote filling assembly according to claim 2, characterized in that: The inner diameter of the vent hole is less than or equal to one third of the inner diameter of the filling connector.

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