Heat transfer device, state parameter detection mechanism, urea tank and solution heating method

Abstract

The application discloses a heat conduction device, a state parameter detection mechanism, a urea tank and a solution heating method. The heat conduction device comprises a pipe body vertically installed in a container, and the pipe body is provided with a first pipeline and a second pipeline which are independent of each other. A flow guide hole in communication with the first pipeline is formed in the side wall below the pipe body. The second pipeline is provided with a liquid inlet and a liquid outlet for circulating the heat fluid in and out of the second pipeline. Based on the above structure of the heat conduction device, the pipe body can provide a relatively stable detection environment for the detection sensor through the first pipeline while providing heating energy for the solution in the container through the second pipeline. Whether the solution is filled or in a vibrating environment, the amount of bubbles and the vibration energy in the first pipeline are relatively small, so that accurate detection data can be obtained.

Description

Technical Field

[0001] This invention relates to the field of urea tank technology, and in particular to a heat conduction device for use in urea tanks, a state parameter detection mechanism for detecting the state of the solution in urea tanks, a urea tank, and a solution heating method. Background Technology

[0002] A urea tank, also known as a urea container, is a storage container for urea. It contains urea solution and is primarily used in diesel-powered trucks and buses. During operation, a urea pump sprays the urea solution from the tank into the vehicle's exhaust pipe, where a reaction occurs, reducing nitrogen oxides in the diesel exhaust into nitrogen and water, thus lowering nitrogen oxide levels in the engine exhaust. Urea tanks typically contain a spirally arranged, slender heating element and a sensor array (including a level sensor and a temperature sensor). However, in current technology, the heating area of ​​the heating element is small, resulting in insufficient heating efficiency. Furthermore, when adding urea solution or during vibrations, air bubbles formed by the urea solution impacting the tank can affect the sensor array, leading to inaccurate data. Summary of the Invention

[0003] One objective of this invention is to provide a heat conduction device that can both heat the urea solution in the urea tank and protect the sensor array inside the urea tank, thus overcoming the shortcomings of the aforementioned technical problems.

[0004] Another objective of this invention is to provide a state parameter detection mechanism with a protective structure, which reduces the impact of solution impact bubbles on the detection sensor without adding an additional protective cover.

[0005] Another objective of this invention is to provide a urea tank that not only has high heating efficiency but also protects the sensor array inside the urea tank, preventing the urea solution from impacting the detection sensors due to air bubbles.

[0006] Another object of the present invention is to provide a solution heating method based on a thermal fluid, which can provide heating energy to the solution while protecting the detection sensor placed in the solution.

[0007] To achieve the above objectives, the present invention discloses a heat conduction device based on a hot fluid, comprising a tube body that can be vertically installed in a container, wherein a first pipe and a second pipe are provided inside the tube body; a guide hole communicating with the first pipe is provided on the lower side wall of the tube body, through which the solution in the container can enter the first pipe; the second pipe is provided with an inlet and an outlet for the hot fluid to enter and exit, and at least a portion of the side wall of the second pipe is part of the outer wall of the tube body, so that the hot fluid circulating inside the second pipe can conduct heat to the solution outside the tube body.

[0008] Compared with the prior art, the heat conduction device of the present invention is a hollow tube with a first pipe and a second pipe inside. When the heat conduction device is installed in a container, a circulating hot fluid is formed in the second pipe through the inlet and outlet. Since at least part of the sidewall of the second pipe is part of the outer wall of the tube, the circulating hot fluid in the second pipe conducts heat to the solution in the container through the outer wall of the tube, thereby heating the solution in the container. At the same time, since a guide hole communicating with the first pipe is opened on the lower sidewall of the tube, the first pipe is connected to the container. The solution in the container flows into the first pipe through the guide hole, and the liquid level of the solution in the first pipe is kept at the same level as the liquid level in the container. Therefore, the real-time state parameters of the solution in the container can be obtained by detecting the liquid level, temperature and other state parameters of the solution in the first pipe. Thus, based on the structure of the tube, while providing heating energy to the solution in the container through the second pipe, the tube can also provide a relatively stable detection environment for the detection sensor through the first pipe. Whether adding solution or in a vibrating environment, the amount of bubbles formed and the vibration energy in the first pipe are relatively small, thereby obtaining accurate detection data.

[0009] Preferably, the upper part of the pipe body is provided with an opening that communicates with the first pipe.

[0010] Preferably, when the tube is installed in the container, the opening is located above the liquid level in the container.

[0011] Preferably, a flow guiding channel is provided in the second pipe, through which the hot fluid in the second pipe can rise to a certain height and flow out from the outlet.

[0012] Preferably, the inner wall of the second pipe is the outer wall of the first pipe, and the outer wall of the second pipe is the outer wall of the pipe body.

[0013] Preferably, the flow channel includes a partition plate extending upward from the bottom wall of the second pipe, the partition plate dividing the internal space of the second pipe into at least two independent partitions, the inlet and the outlet being located in two different partitions respectively, and a flow passage is provided at a certain height above the partition plate, so that the hot fluid in the partition where the inlet is located can rise to a certain height and finally flow into the partition where the outlet is located through the flow passage.

[0014] Preferably, there are multiple partition plates, which divide the internal space of the second pipe into multiple independent zones, with the zone containing the liquid outlet located at the farthest end of the zone containing the liquid inlet.

[0015] Preferably, the flow guide hole extends through opposite sides of the tube body.

[0016] Preferably, the container is a urea tank, and a base is provided at the bottom of the tube. The base is provided with a urea suction port and a urea return port. The urea return port is used to return the urea solution to the urea tank, and the urea suction port is used to draw out the solution from the urea tank.

[0017] Preferably, a filter screen is also provided at the urea intake port and the urea return port, and the urea intake port and the urea return port are located in the filter screen.

[0018] Preferably, a notch extending to the base is provided on the side wall of the tube near the guide hole, and the urea suction port and the urea return port are located within the notch.

[0019] Preferably, a plurality of slots are provided at intervals on the side wall at the top of the tube.

[0020] The present invention also discloses a state parameter detection mechanism with a protective structure, which includes a sensor group and a heat conduction device based on a hot fluid as described above, wherein the sensor group is disposed in the first pipe at the bottom of the pipe body.

[0021] Preferably, the sensor group includes an ultrasonic concentration detector, an ultrasonic liquid level detector, and a temperature detector.

[0022] The present invention also discloses a urea tank, which includes a tank body, wherein the state parameter detection mechanism described above is installed in the tank body.

[0023] Preferably, the housing is provided with a filling port for adding urea solution, and the guide hole is offset from the direct direction of the filling port.

[0024] Preferably, a positioning block connected to the tube is installed on the top of the housing, and the positioning block is used to stabilize the tube.

[0025] This invention also discloses a solution heating method based on a thermal fluid, comprising:

[0026] A tube is vertically installed in a container holding a solution. A first pipe and a second pipe are established inside the tube, and the first pipe is connected to the space outside the tube so that the solution in the container flows into the first pipe and a hot fluid circulates in the second pipe. The solution outside the tube is heated by the circulation of the hot fluid.

[0027] The state of the solution in the first pipe is detected by a sensor array installed at the bottom of the first pipe to detect solution state parameters.

[0028] Preferably, a flow guide hole communicating with the first pipe is provided on the side wall below the tube body, and an opening is provided above the first pipe, so that the solution in the container can enter the first pipe through the flow guide hole.

[0029] Preferably, the second pipe is provided with an inlet and an outlet for hot fluid to enter and exit, and at least a portion of the sidewall of the second pipe is part of the outer wall of the pipe body, so that the hot fluid in the second pipe can conduct heat to the solution outside the pipe body.

[0030] Preferably, the second pipe is also provided with a flow guiding channel, through which the hot fluid in the second pipe rises to a certain height and flows out from the outlet.

[0031] Preferably, the inner wall of the second pipe is the outer wall of the first pipe, and the outer wall of the second pipe is the outer wall of the pipe body.

[0032] Preferably, the flow channel includes a partition plate extending upward from the bottom wall of the second pipe, the partition plate dividing the internal space of the second pipe into at least two independent partitions, the inlet and the outlet being located in two different partitions respectively, and a flow passage is provided at a certain height above the partition plate, so that the hot fluid in the partition where the inlet is located can flow into the partition where the outlet is located through the flow passage after rising to a certain height.

[0033] Preferably, there are multiple partition plates, which divide the internal space of the second pipe into multiple independent zones, with the zone containing the liquid outlet located at the farthest end of the zone containing the liquid inlet.

[0034] Preferably, the container is a urea tank, and a base is provided at the bottom of the tube. The base is provided with a urea suction port and a urea return port. The urea solution is returned to the container where the tube is located through the urea return port, and the urea solution is sucked out of the container where the tube is located through the urea suction port.

[0035] Preferably, a filter screen is also provided at the urea intake port and the urea return port, through which the urea solution enters the tube.

[0036] Preferably, a notch extending to the base is provided on the side wall of the tube near the guide hole, the urea suction port and the urea return port are located in the notch, and the urea suction port and the urea return port are respectively located on both sides of the guide hole, and the filter screen can be embedded in the notch. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the planar structure of the urea tank in an embodiment of the present invention.

[0038] Figure 2 This is a longitudinal cross-sectional view of the urea tank in an embodiment of the present invention.

[0039] Figure 3 This is another longitudinal cross-sectional view of the urea tank in an embodiment of the present invention.

[0040] Figure 4 This is a schematic diagram of the planar structure of the heat conduction device in an embodiment of the present invention, on which a sensor group is mounted.

[0041] Figure 5 This is a schematic diagram of the planar structure of the heat conduction device in an embodiment of the present invention, without the sensor group installed on it.

[0042] Figure 6 For along Figure 4 A schematic cross-sectional view along the AA direction.

[0043] Figure 7 For along Figure 5 A cross-sectional view along the BB direction. Detailed Implementation

[0044] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0045] like Figures 4 to 7 As shown, this invention discloses a heat transfer device based on a hot fluid. This heat transfer device is used to transfer heat from the hot fluid to a solution to heat the solution. The heat transfer device includes a tube 2 that can be vertically installed in a container. The tube 2 contains a first pipe 20 and a second pipe 21 that are independent of each other. A guide hole 22 communicating with the first pipe 20 is provided on the lower side wall of the tube 2. The solution in the container can enter the first pipe 20 through the guide hole 22. The liquid level line in the first pipe 20 is parallel to the liquid level line in the container. The second pipe 21 is provided with an inlet 210 and an outlet 211 for the entry and exit of hot fluid. The inlet 210 and outlet 211 can be provided on the side wall or bottom wall of the second pipe 21, but it is preferred to be provided on the bottom wall. The hot fluid circulates in the second pipe 21 through the inlet 210 and outlet 211. At least part of the side wall of the second pipe 21 is part of the outer wall of the pipe body 2, so that the hot fluid in the second pipe 21 can conduct heat to the solution outside the pipe body 2.

[0046] Furthermore, such as Figure 4 and Figure 5An opening 200 communicating with the first pipe 20 can be provided above the pipe body 2, so that the air pressure inside the first pipe 20 is kept consistent with the air pressure outside the pipe body 2 in real time. When the pipe body 2 is installed in the container, the opening 200 is located above the liquid level line in the container (i.e., the height reached by the set volume of the box), to prevent the solution from flowing in from the opening when adding solution or under vibration. In addition, to improve the heating effect of the second pipe 21, a flow guide channel is also provided in the second pipe 21. Through the flow guide channel, the hot fluid in the second pipe 21 rises to a certain height and flows out from the outlet 211, thereby preventing the hot fluid from entering from the inlet 210 and flowing out directly from the outlet 211, thus failing to play a role in heat transfer.

[0047] The working principle of the heat transfer device described above will be explained in detail below using a urea tank as an example. When installing this heat transfer device inside the urea tank housing 1, please refer to [the relevant documentation / reference]. Figures 2 to 7 First, a circulating hot fluid is formed in the second pipe 21 through the inlet 210 and the outlet 211. Since at least part of the sidewall of the second pipe 21 is part of the outer wall of the pipe body 2, when the hot fluid circulates in the second pipe 21, the hot fluid conducts heat to the urea solution in the box body 1 through the outer wall of the pipe body 2, thereby circulating and heating the urea solution in the box body 1. Secondly, since a guide hole 22 communicating with the first pipe 20 is provided on the lower side wall of the tube body 2, the first pipe 20 is connected to the box body 1. The urea solution in the box body 1 flows into the first pipe 20 through the guide hole 22. The liquid level of the urea solution in the first pipe 20 is kept flush with the liquid level in the box body 1. Therefore, by detecting the liquid level, temperature and other state parameters of the urea solution in the first pipe 20, the real-time state parameters of the urea solution in the box body 1 can be obtained. Therefore, based on the structure of the tube body 2, the sensor group 3 can be installed in the first pipe 20. During the process of adding urea solution, the urea solution will flow smoothly into the first pipe 20 through the guide hole 22. The tube body 2 can effectively protect the sensor group 3, thus avoiding the addition of urea solution. The turbulence or bubbles generated by the impact of the urea solution directly affect the sensor group 3 located in the first pipe 20. Specifically, when adding urea solution, the impact of the urea solution on the tank or pipe 2 will generate bubbles. Because bubbles are relatively light, most of them will rise to the surface and disappear, thus effectively preventing bubbles from entering the first pipe 20 through the guide hole 22 and interfering with the detection of the sensor group 3. In addition, when the tank 1 vibrates, the vibration of the urea solution in the first pipe 20 will have a smaller impact than the entire space inside the tank 1, thereby reducing the impact of solution oscillation caused by vibration on the sensor group 3, thus providing a more stable detection environment for the sensor group 3 and obtaining accurate detection data. Preferably, as Figure 5The guide hole 22 penetrates the opposite sides of the pipe body 2, thereby accelerating the time for the urea solution to enter the first pipe 20 and avoiding deviation between the liquid level in the first pipe 20 and the liquid level in the tank 1 during the filling process when the filling is too fast.

[0048] like Figure 7 As shown, to improve the heating efficiency of the tube body 2, the inner wall of the second pipe 21 is the outer wall of the first pipe 20, and the outer wall of the second pipe 21 is the outer wall of the tube body 2. That is, the first pipe 20 is located in the inner annular cavity of the tube body 2, and the second pipe 21 is located in the outer annular cavity of the tube body 2. The second pipe 21 surrounds the periphery of the first pipe 20. When the hot fluid circulates in the second pipe 21, the hot fluid transfers heat to the urea solution inside and outside the tube body 2 through the second pipe 21. Specifically, heat is transferred to the urea solution outside the tube body 2 through the outer wall of the tube body 2 (i.e., the outer wall of the second pipe 21), and heat is transferred to the urea solution inside the tube body 2 (i.e., the urea solution in the first pipe 20) through the inner wall of the second pipe 21. Therefore, the heat transfer through the inner and outer walls of the second pipe 21 effectively increases the heating area, thereby improving the heating efficiency, while effectively ensuring that the urea solution in the first pipe 20 is heated sufficiently and uniformly. The structure of the second pipe 21 in this embodiment can effectively increase the area of ​​the heat conduction medium, thereby effectively improving the heating efficiency.

[0049] Please refer to the following: Figure 2 and Figure 3 as well as Figure 6 and Figure 7The flow channel includes a partition plate 212 extending upward from the bottom wall of the second pipe 21. The partition plate 212 divides the internal space of the second pipe 21 into at least two independent zones. The inlet 210 and the outlet 211 are located in two different zones respectively. A flow passage 213 is provided at a certain height above the partition plate 212. The hot fluid in the zone where the inlet 210 is located can flow into the zone where the outlet 211 is located after rising to a certain height through the flow passage 213. In this embodiment, in addition to the function of isolating zones, the partition plate 212 also serves to strengthen the pipe body 2. Therefore, the partition plate 212 can extend from the bottom to the top of the pipe body 2, and the flow passage 213 is located in the middle or upper part of the partition plate 212. Preferably, there are multiple partition plates 212, which divide the internal space of the second pipe into multiple independent zones. The zone S1 where the outlet 211 is located is located at the farthest end of the zone S2 where the inlet 210 is located. When the hot fluid flows into the second pipe from the inlet 210, it first accumulates in the zone S1 where the inlet 210 is located. When the hot fluid in the zone S1 where the inlet 210 is located rises to the flow hole 213, part of the hot fluid flows into the adjacent zone through the flow hole 213, and finally converges and flows into the zone S2 where the outlet 211 is located, thereby quickly and efficiently transferring heat to the urea solution inside and outside the pipe body 2 through the second pipe 21. Furthermore, the partition S2 containing the outlet 211 and the partition S1 containing the inlet 210 can be arranged adjacent to each other, and the flow-through holes 213 on the partition plate 212 between the two partitions can be removed. In this way, after the hot fluid flows out of the partition S1 containing the inlet 210, it flows unidirectionally through the flow-through holes 213 on other partition plates 212, and finally flows to the partition S2 containing the outlet 211, thus realizing the circulation of the hot fluid in the second pipe 21. Therefore, by setting up multiple independent partitions, the hot fluid can be retained in the second pipe for a longer period of time, thereby making full use of the heat of the hot fluid and providing sufficient time for the hot fluid to complete heat exchange.

[0050] To facilitate the use of the aforementioned heat transfer device in the urea tank, such as Figures 2 to 7 As shown, a base 5 is provided at the bottom of the tube body 2. The base 5 has a urea intake port 50 and a urea return port 51 adjacent to the tube body 2. The urea return port 51 is used to return the urea solution to the urea tank, and the urea intake port 50 is used to draw out the urea solution from the urea tank. In use, the urea intake conduit and the urea return conduit, which are compatible with the urea tank, are connected to the urea intake port 50 and the urea return port 51, respectively. Preferably, a filter screen 25 is also provided at the urea intake port 50 and the urea return port 51. The urea intake port 50 and the urea return port 51 are located within the filter screen 25. This filter screen 25 ensures that the urea solution, whether flowing out from the urea intake port 50 or flowing in from the urea return port 51, is filtered through the filter screen. This prevents impurities in the urea tank from flowing into the urea intake conduit and also prevents impurities in the urea return conduit from flowing into the urea tank.

[0051] Furthermore, such as Figure 6 As shown, to ensure that the urea solution drawn through the urea inlet 50 is fully heated and thawed, a notch 24 extending to the base 5 is provided on the side wall of the tube body 2 near the guide hole 22. The urea inlet 50 and the urea return inlet 51 are located within the notch 24, thus placing the urea inlet 50 and the urea return inlet 51 inside the tube body 2. Preferably, the urea inlet 50 and the urea return inlet 51 are located on opposite sides of the guide hole 22, and the filter screen 23 can be embedded within the notch 24, resulting in better integration of the heat conduction device.

[0052] like Figure 4 and Figure 5 As shown, several slots 23 can be spaced apart on the side wall at the top of the tube body 2 to reduce the weight of the tube body 2 and lower the center of gravity of the tube body 2, so that the tube body 2 remains in a more stable state.

[0053] like Figures 1 to 3 and Figure 6 As shown, this invention also discloses a urea tank, which includes a tank body 1 and a state parameter detection mechanism with a protective structure installed in the tank body 1. The state parameter detection mechanism is used to detect the state parameters of the urea solution in the urea tank, such as liquid level, temperature, and concentration. The state parameter detection mechanism includes a sensor group 3 and a heat conduction device with the above-described structure. The sensor group 3 is disposed in a first pipe 20 at the bottom of the pipe body 2. In this embodiment, the combination of the sensor group 3 and the pipe body 2 results in a higher degree of integration of the urea tank. Not only can the urea solution in the urea tank be efficiently heated through the pipe body 2, but the pipe body 2 also protects the sensor group 3, effectively reducing the interference of bubble detection caused by the impact of urea solution. Preferably, the sensor group 3 includes an ultrasonic concentration detector, an ultrasonic liquid level detector, and a temperature detector. Furthermore, the inlet 210 and outlet 211 can be connected to the cooling system of the car engine. The high-temperature coolant output from the cooling system flows into the second pipe in the pipe body 2 through the inlet 210. After heat exchange, the coolant with a lower temperature flows back to the cooling system through the outlet 211.

[0054] In addition, such as Figures 1 to 3 To facilitate the addition of urea solution, the housing 1 is provided with a filling port 10 for adding urea solution. The guide hole 22 is offset from the direct direction of the filling port 10, so as to avoid the urea solution being poured directly into the guide hole 22 when adding urea solution, which would affect the sensor group 3 located at the guide hole 22. In addition, it can also prevent the air bubbles generated when adding urea solution from directly entering the liquid level and concentration detection area through the guide hole 22 and interfering with the detection of the sensor group.

[0055] In another preferred embodiment of the urea tank of the present invention, such as Figure 2and Figure 3 To facilitate the stabilization of the pipe body 2, a positioning block 4 connected to the pipe body 2 is installed on the top of the box body 1. The positioning block 4 is used to stabilize the pipe body 2.

[0056] In summary, as Figures 1 to 7 This invention discloses a urea tank with a heat conduction device. In use, a sensor assembly 3 is installed at the bottom of a first pipe 20, and a pipe body 2 is installed inside the tank body 1. The sensor assembly 3 is covered by the first pipe 20, and a hot fluid is injected into a second pipe 21, allowing the hot fluid to circulate within the second pipe 21. This circulating hot fluid heats the urea solution inside and outside the pipe body 2, effectively improving heating efficiency. Simultaneously, because the sensor assembly 3 is covered by the first pipe 20, bubbles formed by the impact of the urea solution in the urea tank can be prevented from directly affecting the sensor assembly 3.

[0057] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A heat transfer device based on a thermal fluid, characterized in that, The device includes a tube that can be vertically installed in a container. The tube contains a first pipe and a second pipe, which are independent of each other. A flow guide hole, communicating with the first pipe, is provided on the lower side wall of the tube, allowing the solution in the container to enter the first pipe through the flow guide hole. The second pipe has an inlet and an outlet for hot fluid. At least a portion of the side wall of the second pipe is part of the outer wall of the tube, allowing the circulating hot fluid in the second pipe to conduct heat to the solution outside the tube. A flow guide channel is provided inside the second pipe, through which the hot fluid rises to a certain height and flows out from the outlet. The flow channel includes a partition plate extending upward from the bottom wall of the second pipe. The partition plate divides the internal space of the second pipe into at least two independent partitions. The inlet and the outlet are located in two different partitions. A flow passage is provided at a certain height above the partition plate. After the hot fluid in the partition where the inlet is located rises to a certain height, it can flow into the partition where the outlet is located through the flow passage.

2. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, An opening communicating with the first pipe is provided at the top of the pipe body.

3. The heat transfer device based on a thermal fluid according to claim 2, characterized in that, When the tube is installed in the container, the opening is located above the liquid level in the container.

4. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, The inner wall of the second pipe is the outer wall of the first pipe, and the outer wall of the second pipe is the outer wall of the pipe body.

5. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, There are multiple partition plates, which divide the internal space of the second pipe into multiple independent zones. The zone where the liquid outlet is located is located at the farthest end of the zone where the liquid inlet is located.

6. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, The flow guide hole extends through the opposite sides of the tube body.

7. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, The container is a urea tank. A base is provided at the bottom of the tube. The base is provided with a urea suction port and a urea return port. The urea return port is used to return the urea solution to the urea tank, and the urea suction port is used to suck out the solution from the urea tank.

8. The heat transfer device based on a thermal fluid according to claim 7, characterized in that, A filter screen is also provided at the urea suction port and the urea return port, and the urea suction port and the urea return port are located in the filter screen.

9. The heat transfer device based on a thermal fluid according to claim 8, characterized in that, A notch extending to the base is provided on the side wall of the tube near the guide hole, and the urea suction port and the urea return port are located within the notch.

10. The heat transfer device based on a thermal fluid according to claim 1, characterized in that, Several empty slots are spaced apart on the side wall at the top of the tube.

11. A state parameter detection mechanism with a protective structure, characterized in that, It includes a sensor array and a heat conduction device based on a thermal fluid as described in any one of claims 1 to 10, wherein the sensor array is disposed in the first pipe at the bottom of the pipe body.

12. The state parameter detection mechanism with a protective structure according to claim 11, characterized in that, The sensor group includes an ultrasonic concentration detector, an ultrasonic liquid level detector, and a temperature detector.

13. A urea tank, characterized in that, It includes a housing, in which the state parameter detection mechanism as described in claim 12 is installed.

14. The urea tank according to claim 13, characterized in that, The box is provided with a filling port for adding urea solution, and the guide hole is offset from the direct direction of the filling port.

15. The urea tank according to claim 13, characterized in that, The top of the box is equipped with a positioning block that is connected to the tube, and the positioning block is used to stabilize the tube.

16. A solution heating method based on a thermal fluid, characterized in that, include: A tube is vertically installed in a container holding a solution. A first pipe and a second pipe are established independently within the tube, and the first pipe is connected to the space outside the tube so that the solution in the container flows into the first pipe. A hot fluid circulates in the second pipe, and the solution outside the tube is heated by the circulation of the hot fluid. The state of the solution in the first pipe is detected by a sensor array installed at the bottom of the first pipe to detect solution state parameters. The second pipe is provided with an inlet and an outlet for hot fluid to enter and exit. At least part of the sidewall of the second pipe is part of the outer wall of the pipe body, so that the hot fluid in the second pipe can conduct heat to the solution outside the pipe body. The second pipe is also provided with a flow guide channel. Through the flow guide channel, the hot fluid in the second pipe rises to a certain height and flows out from the outlet. The flow guide channel includes a partition plate extending upward from the bottom wall of the second pipe. The partition plate divides the internal space of the second pipe into at least two independent partitions. The inlet and the outlet are located in two different partitions. A flow passage is provided at a certain height above the partition plate. The hot fluid in the partition where the inlet is located can flow into the partition where the outlet is located through the flow passage after rising to a certain height.

17. The solution heating method based on a thermal fluid according to claim 16, characterized in that, A flow guide hole communicating with the first pipe is provided on the side wall below the tube body, and an opening is provided above the first pipe, through which the solution in the container can enter the first pipe.

18. The solution heating method based on a thermal fluid according to claim 16, characterized in that, The inner wall of the second pipe is the outer wall of the first pipe, and the outer wall of the second pipe is the outer wall of the pipe body.

19. The solution heating method based on a thermal fluid according to claim 16, characterized in that, There are multiple partition plates, which divide the internal space of the second pipe into multiple independent zones. The zone where the liquid outlet is located is located at the farthest end of the zone where the liquid inlet is located.

20. The solution heating method based on a thermal fluid according to claim 17, characterized in that, The container is a urea tank. The bottom of the tube is provided with a base. The base is provided with a urea suction port and a urea return port. The urea solution is returned to the container where the tube is located through the urea return port, and the urea solution is sucked out of the container where the tube is located through the urea suction port.

21. The solution heating method based on a thermal fluid according to claim 20, characterized in that, A filter screen is also provided at the urea intake port and the urea return port, through which the urea solution enters the tube.

22. The solution heating method based on a thermal fluid according to claim 21, characterized in that, A notch extending to the base is provided on the side wall of the tube near the guide hole. The urea suction port and the urea return port are located in the notch, and the urea suction port and the urea return port are respectively located on both sides of the guide hole. The filter screen can be embedded in the notch.

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