Urea sensor with urea solution heating structure and urea box assembly

Abstract

The utility model provides a urea sensor with a urea solution heating structure and a urea box assembly, the urea sensor with the urea solution heating structure comprises a heating main body and a detection device, and a first urea solution filling channel communicated with the outside is arranged in the heating main body along the axial direction of the heating main body; the detection device is arranged on the heating main body in a penetrating mode and faces the first urea solution filling channel, a fluid channel which is bent and extends back and forth is further formed in the heating main body in the axial direction of the heating main body, and the fluid channel is arranged around the first urea solution filling channel and the detection device in the circumferential direction of the heating main body; a cooling liquid inlet and a cooling liquid outlet are formed in the outer side of the heating body, the cooling liquid inlet is communicated with one end of the fluid channel, and the cooling liquid outlet is communicated with the other end of the fluid channel. The urea sensor with the urea solution heating structure has the advantage of being high in urea solution heating and unfreezing efficiency, and meanwhile it is guaranteed that an SCR system operates rapidly and effectively.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exhaust treatment, in particular to a urea sensor with a urea solution heating structure and a urea tank assembly. Background Art

[0002] In many cities around the world, automobile exhaust has become the primary source of air pollution. Automobile exhaust contains thousands of chemical substances, which are mainly divided into two categories: gas (carbon monoxide, nitrogen oxides, etc.) and particulate matter. In order to meet the environmental regulations of the EU automobile emission standards, the SCR system is widely promoted in the market to treat gas (carbon monoxide, nitrogen oxides) pollutants in automobile exhaust. The urea tank in the SCR system is used to store urea solution. The sensor is installed on the urea tank, which is responsible for absorbing / returning urea solution, heating urea solution, and detecting the state parameters of urea solution (liquid level, temperature, quality detection).

[0003] Traditional sensors use spiral stainless steel pipes in the urea heating structure, which not only has a complex manufacturing process, high manufacturing requirements and great difficulty, but also has a not very ideal heating and thawing effect, and the heating and thawing efficiency of the urea solution is low. Secondly, in a low-temperature cold environment, since the detection structure of the traditional sensor is at a certain distance from the heating spiral tube, the detection structure is affected by the low temperature and cannot operate quickly and effectively, which in turn causes the SCR system to not need to operate quickly and effectively. In addition, when the traditional sensor detects the liquid level height, the probe of the detection structure emits an ultrasonic wave under the action of an electrical signal. The ultrasonic wave returns when it reaches the surface of the urea solution. After receiving the returned ultrasonic wave, the probe calculates the liquid level height and converts it into an electrical signal output. However, since the traditional sensor is installed on the upper part of the urea tank, the probe of the detection structure is at a certain distance from the bottom of the urea tank, resulting in the urea tank having an unnecessary volume and an initial liquid level.

[0004] Therefore, it is necessary to at least provide a urea sensor with a urea solution heating structure that has high urea solution heating and thawing efficiency and can ensure fast and effective operation of the SCR system, and a urea tank assembly having the urea sensor with the urea solution heating structure. Utility Model Content

[0005] The first object of the utility model is to provide a urea sensor with a urea solution heating structure, which has high urea solution heating and thawing efficiency and can ensure fast and effective operation of an SCR system.

[0006] The second object of the utility model is to provide a urea tank assembly, which has a urea sensor with a urea solution heating structure, which has high urea solution heating and thawing efficiency and can ensure fast and effective operation of the SCR system.

[0007] To achieve the above-mentioned first purpose, the utility model provides a urea sensor with a urea solution heating structure, comprising a heating body and a detection device, wherein a first urea solution filling channel communicating with the outside is provided in the heating body along its axial direction, the detection device is penetrated through the heating body and faces the first urea solution filling channel, and the detection device is used to detect the urea solution located in the first urea solution filling channel; a fluid channel extending back and forth is also provided in the heating body along its axial direction, and the fluid channel is arranged around the first urea solution filling channel and the detection device along the circumferential direction of the heating body, and a coolant inlet and a coolant outlet are respectively provided on the outside of the heating body, the coolant inlet is communicated with one end of the fluid channel, and the coolant outlet is communicated with the other end of the fluid channel.

[0008] Compared with the prior art, the urea sensor with a urea solution heating structure of the utility model is provided with a heating body, and a first urea solution filling channel is provided in the heating body, so that after the heating body is inserted into the urea tank, part of the urea solution in the urea tank can be stored in the first urea solution filling channel, and a fluid channel is provided in the circumferential direction of the first urea solution filling channel, and the fluid channel is bent and extended back and forth along the axial direction of the heating body, so that after the high-temperature coolant enters the fluid channel from the coolant water inlet of the heating body, it will bend and flow back and forth along the fluid channel, and heat the urea solution inside the first urea solution filling channel in the circumferential direction, thereby increasing the heating area of ​​the urea solution in the first urea solution filling channel, fully extending the heat conduction path of the high-temperature coolant, effectively improving the heating and thawing efficiency of the urea solution, and having the characteristics of high heating and thawing efficiency of the urea solution; at the same time, because the fluid channel surrounds the detection device in the circumferential direction of the heating body, the high-temperature coolant flowing in the fluid channel can quickly heat the detection device, so that the detection device is quickly thawed and quickly and effectively operates, thereby ensuring the rapid and effective operation of the SCR system.

[0009] Preferably, the heating main body includes a mounting head, a heating cylinder body and a mounting cover, one axial end of the heating cylinder body is connected to the mounting head, and the other axial end of the heating cylinder body is connected to the mounting cover; the first urea solution filling channel is arranged on the heating cylinder body along the axial direction of the heating cylinder body, the detection device is penetrated by the mounting head, the fluid channel is arranged on the heating cylinder body, the mounting head and the mounting cover in a manner of bending back and forth and extending along the axial direction of the heating cylinder body, and the fluid channel is arranged around the first urea solution filling channel and the detection device along the circumferential direction of the heating cylinder body, and the coolant inlet and the coolant outlet are respectively provided on the mounting head.

[0010] Preferably, a coolant inlet channel and a coolant outlet channel are respectively provided inside the mounting head, one end of the coolant inlet channel forms the coolant inlet on the outside of the mounting head, the other end of the coolant inlet channel is communicated with one end of the fluid channel, one end of the coolant outlet channel forms the coolant outlet on the outside of the mounting head, and the other end of the coolant outflow channel is communicated with the other end of the fluid channel.

[0011] Preferably, the coolant inflow channel is spirally arranged inside the mounting head along the circumferential direction of the mounting head.

[0012] Preferably, the coolant inlet channel includes a plurality of straight hole channels which are perpendicular to each other and connected in sequence along the circumferential direction of the mounting head, one end of the straight hole channel passes through the mounting head, and the other end of the straight hole channel extends to the interior of the mounting head; in the circumferential direction of the mounting head, the first straight hole channel forms the coolant inlet on the outside of the mounting head, and the ends of the remaining straight hole channels exposed to the outside are provided with plugs for sealing them.

[0013] Preferably, the coolant inlet channel bends and extends continuously from one end forming the coolant inlet to the other end.

[0014] Preferably, the fluid channel includes a first flow channel portion, a first connecting portion and a second connecting portion, the first flow channel portion is arranged on the heating cylinder body in a penetrating manner along the axial direction of the heating cylinder body, and a plurality of the first flow channel portions are arranged around the first urea solution filling channel along the circumferential direction of the heating cylinder body; a plurality of the first connecting portions are arranged in sequence on a side of the mounting head facing the heating cylinder body along the circumferential direction of the mounting head, and a plurality of the second connecting portions are arranged in sequence on a side of the mounting cover facing the heating cylinder body along the circumferential direction of the mounting cover; each of the first connecting portions connects two adjacent first flow channel portions in sequence along the circumferential direction of the mounting head, and each of the second connecting portions connects two adjacent first flow channel portions in sequence along the circumferential direction of the mounting head, and the first connecting portions and the second connecting portions are staggered.

[0015] Preferably, an anti-foolproof groove is provided on the outer side wall of the heating tube body.

[0016] To achieve the above-mentioned second purpose, the utility model provides a urea tank assembly, including a urea tank body and the above-mentioned urea sensor with a urea solution heating structure, wherein the urea tank body is provided with a cavity for accommodating urea solution, the heating body is arranged on the bottom of the urea tank body and penetrates the cavity, and a urea solution channel is provided in the heating body and is connected between the cavity and the lower end of the first urea solution filling channel.

[0017] Compared with the prior art, the urea tank of the utility model always has a urea sensor with a urea solution heating structure. The urea sensor with a urea solution heating structure is provided with a heating body, and a first urea solution filling channel is provided in the heating body, so that after the heating body is inserted into the urea tank, part of the urea solution in the urea tank can be stored in the first urea solution filling channel, and a fluid channel is provided in the circumferential direction of the first urea solution filling channel, and the fluid channel is bent back and forth along the axial direction of the heating body. Therefore, after the high-temperature coolant enters the fluid channel from the coolant water inlet of the heating body, it will flow along the fluid channel. The high-temperature coolant flows back and forth, and heats the urea solution inside the first urea solution filling channel in the circumferential direction thereof, thereby increasing the heating area of ​​the urea solution in the first urea solution filling channel, fully extending the heat conduction path of the high-temperature coolant, and effectively improving the heating and thawing efficiency of the urea solution, and having the characteristics of high heating and thawing efficiency of the urea solution; at the same time, since the fluid channel surrounds the detection device in the circumferential direction of the heating body, the high-temperature coolant flowing in the fluid channel can quickly heat the detection device, so that the detection device is quickly thawed and quickly and effectively operates, thereby ensuring the fast and effective operation of the SCR system.

[0018] Preferably, the top plane of the detection device is lower than the bottom surface of the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the urea tank assembly of the utility model.

[0020] Figure 2 It is a cross-sectional view of a urea sensor with a urea solution heating structure of the utility model.

[0021] Figure 3 It is a three-dimensional structural diagram of a urea sensor with a urea solution heating structure of the utility model.

[0022] Figure 4 yes Figure 3 An exploded view of a urea sensor with a urea solution heating structure is shown.

[0023] Figure 5 yes Figure 3 A top view of a urea sensor with a urea solution heating structure is shown.

[0024] Figure 6 It is a front view of the mounting head of the utility model.

[0025] Figure 7 is along Figure 6 Cross-sectional view along the AA direction.

[0026] Figure 8 It is a bottom view of the mounting head of the utility model.

[0027] Fig. 9 It is a three-dimensional structural diagram of the heating tube body of the utility model.

[0028] Fig.10 yes Fig. 9 A side view of the heating cartridge body is shown.

[0029] Fig.11 It is a three-dimensional structural diagram of the installation cover of the utility model.

[0030] Fig.12 yes Fig.11 is a top view of the mounting cover shown.

[0031] Fig.13 is along Fig.12 Cross-sectional view along the BB direction.

[0032] Fig.14 It is a model diagram of a coolant inflow channel, a fluid channel and a coolant outflow channel inside a urea sensor with a urea solution heating structure of the utility model.

[0033] Fig.15 It is a model diagram of another embodiment of the coolant inflow channel, the fluid channel and the coolant outflow channel inside the urea sensor with a urea solution heating structure of the utility model.

[0034] Fig.16 It is a structural diagram of the fluid channel inside the urea sensor with a urea solution heating structure of the utility model when it surrounds the detection device. DETAILED DESCRIPTION

[0035] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0036] See also Figures 1 to 5 ,as well as Fig.16The urea tank assembly 300 of the utility model includes a urea tank body 301 and a urea sensor 200 with a urea solution heating structure. The urea sensor 200 with a urea solution heating structure includes a heating body 1 and a detection device 201. A first urea solution filling channel 11 communicating with the outside is provided in the heating body 1 along its axial direction. The detection device 201 is arranged on the heating body 1 and faces the first urea solution filling channel 11. The detection device 201 is used to detect the urea solution in the first urea solution filling channel 11. A fluid channel 12 extending back and forth is also provided in the heating body 1 along its axial direction, and the fluid channel 12 is arranged around the first urea solution filling channel 11 and the detection device 201 along the circumferential direction of the heating body 1. A coolant inlet 13 and a coolant outlet 14 are respectively provided on the outside of the heating body 1. The coolant inlet 13 is communicated with one end of the fluid channel 12, and the coolant outlet 14 is communicated with the other end of the fluid channel 12. The urea tank body 301 has a cavity 301a for accommodating urea solution. The heating body 1 is arranged on the bottom of the urea tank body 301 and penetrates the cavity 301a. The heating body 1 is provided with a urea solution channel M connecting the cavity 301a and the lower end of the first urea solution filling channel 11.

[0037] The urea sensor 200 with a urea solution heating structure of the utility model is provided with a heating body 1, and a first urea solution filling channel 11 is provided in the heating body 1, so that after the heating body 1 is inserted into the urea tank body 301, part of the urea solution in the urea tank body 301 can enter and be stored in the first urea solution filling channel 11 through the urea solution channel M, and a fluid channel 12 is provided in the circumferential direction of the first urea solution filling channel 11, and the fluid channel 12 is bent back and forth along the axial direction of the heating body 1. Therefore, after the high-temperature coolant enters the fluid channel 12 from the coolant inlet 13 of the heating body 1, it will bend back and forth along the fluid channel 12 and flow, and heat the urea solution inside the first urea solution filling channel 11 in the circumferential direction, thereby increasing the heating area of ​​the urea solution in the first urea solution filling channel 11. At the same time, since the fluid channel 12 is arranged around the detection device 201 along the circumferential direction of the heating body 1, the high-temperature coolant flowing in the fluid channel 12 can quickly heat the detection device 201, so that the detection device 201 is quickly thawed and operates quickly and effectively, thereby ensuring that the SCR system operates quickly and effectively.

[0038] In addition, the urea solution in the cavity 301a of the urea tank body 301 can enter the first urea solution filling channel 11 of the heating body 1 through the urea solution channel M, so that the first urea solution filling channel 11 in the heating body 1 is consistent with the liquid level of the urea solution in the external cavity 301a. At the same time, the detection device 201 is arranged on the heating body 1 and faces the first urea solution filling channel 11, so the detection device 201 is surrounded by the first urea solution filling channel 11 and contacts the urea solution in the first urea solution filling channel 11. When the urea solution is added to the cavity 301a of the urea tank body 301, the bubbles generated by the fast-flowing urea solution are isolated at the periphery of the heating body 1 and cannot enter the first urea solution filling channel 11 inside the heating body 1, thereby not affecting the accuracy of the detection device 201 in detecting the liquid level. Furthermore, since the urea solution is divided into an inner part and an outer part by the heating body 1, and the diameter of the inner first urea solution filling channel 11 is small, even if the urea solution shakes violently when the vehicle is running, it has little effect on the urea solution inside the heating body 1, thereby improving the problem of liquid level jump in the urea sensor 200 with a urea solution heating structure.

[0039] See also Figures 2 to 4 ,as well as Fig.14 In one embodiment, the heating body 1 includes a mounting head 15, a heating tube body 16 and a mounting cover 17, one axial end of the heating tube body 16 is connected to the mounting head 15, and the other axial end of the heating tube body 16 is connected to the mounting cover 17; the first urea solution filling channel 11 is arranged on the heating tube body 16 along the axial direction of the heating tube body 16, the fluid channel 12 is arranged on the heating tube body 16, the mounting head 15 and the mounting cover 17 in a manner of bending back and forth along the axial direction of the heating tube body 16, and the fluid channel 12 is arranged around the first urea solution filling channel 11 along the circumferential direction of the heating tube body 16, and the coolant inlet 13 and the coolant outlet 14 are respectively provided on the mounting head 15. The high-temperature coolant can first enter the fluid channel 12 of the heating cylinder body 16 through the coolant inlet 13 of the mounting head 15, and then flow back and forth along the fluid channel 12 in the axial direction of the heating cylinder body 16, and flow around the first urea solution filling channel 11 in the circumferential direction of the heating cylinder body 16, thereby heating the urea solution in the first urea solution filling channel 11, and finally flow out through the coolant outlet 14 of the mounting head 15. Therefore, the utility model effectively improves the heating and thawing efficiency of the urea solution by fully extending the heat conduction path of the high-temperature coolant.

[0040] Optionally, the mounting head 15 , the heating tube body 16 and the mounting cover 17 are an integrated structure.

[0041] Optionally, at least one of the mounting head 15 and the mounting cover 17 is in a detachable connection structure with the heating cylinder body 16. For example, the mounting head 15 is in a detachable connection structure with the heating cylinder body 16, and the mounting cover 17 is in an integral structure with the heating cylinder body 16; for another example, the mounting cover 17 is in a detachable connection structure with the heating cylinder body 16, and the mounting head 15 is in an integral structure with the heating cylinder body 16; for another example, both the mounting head 15 and the mounting cover 17 are in a detachable connection structure with the heating cylinder body 16.

[0042] See also Figure 2 In one embodiment, the upper portion of the mounting head 15 is provided with a receiving groove 158 communicating with the cavity 301a, and the lower end of the heating cylinder body 16 extends into the receiving groove 158 and is connected to the mounting head 15. Figure 2 As shown, the starting section of the urea solution channel M between the heating cylinder body 16 and the mounting head 15 is located between the inner side wall of the mounting head 15 and the outer wall of the heating cylinder body 16, then bends and extends to the position between the inner bottom wall of the mounting head 15 and the lower end of the heating cylinder body 16, and finally communicates with the first urea solution filling channel 11.

[0043] See also Figure 6 and Figure 7 In one embodiment, a coolant inflow channel 151 and a coolant outflow channel 152 are respectively provided inside the mounting head 15, one end of the coolant inflow channel 151 forms a coolant water inlet 13 outside the mounting head 15, and the other end of the coolant inflow channel 151 is connected to one end of the fluid channel 12, one end of the coolant outflow channel 152 forms a coolant water outlet 14 outside the mounting head 15, and the other end of the coolant outflow channel 152 is connected to the other end of the fluid channel 12, thereby forming an internal water channel for the high-temperature coolant flow channel. Specifically, the other end of the coolant inflow channel 151 forms a coolant inlet 151c inside the mounting head 15, and the coolant inlet 151c is connected to one end of the fluid channel 12, and the other end of the coolant outflow channel 152 forms a coolant outlet 152a inside the mounting head 15, and the coolant outlet 152a is connected to the other end of the fluid channel 12.

[0044] See also Figure 6 and Figure 7 The coolant inflow channel 151 is spirally arranged inside the mounting head 15 along the circumferential direction of the mounting head 15, thereby further extending the heat conduction path of the high-temperature coolant and improving the heat conduction efficiency. At the same time, the coolant inflow channel 151 can also form a heat preservation module shaped like a thermos cup, which has a good heat preservation effect on the urea solution in the heating cylinder body.

[0045] See also Figure 6 , Figure 7 and Fig.14In one embodiment, the coolant inflow channel 151 includes a plurality of straight hole channels 151a which are perpendicular to each other and connected in sequence along the circumferential direction of the mounting head 15. One end of the straight hole channel 151a penetrates the mounting head 15, and the other end of the straight hole channel 151a extends to the inside of the mounting head 15. In the circumferential direction of the mounting head 15, the first straight hole channel 151a forms a coolant inlet 13 on the outside of the mounting head 15, and the ends of the remaining straight hole channels 151a exposed to the outside are provided with plugs 151b for blocking them. After the high-temperature coolant enters the straight hole channel 151a from the coolant inlet 13 of the mounting head 15, it will swirl around the inside of the mounting head 15 along the straight hole channel 151a, and then enter the fluid channel 12 of the heating cylinder body 16. Among them, the plug 151b and the straight hole channel 151a can be connected by hot melt welding, so that the straight hole channel 151a is blocked by the plug 151b. Specifically, the number of the straight hole channels 151a is six, but not limited thereto, for example, the number of the straight hole channels 151a may also be three or four, etc. Since one end of the straight hole channel 151a passes through the mounting head 15, and the other end of the straight hole channel 151a extends to the interior of the mounting head 15, the convenience of processing the straight hole channel 151a can be greatly improved.

[0046] See also Fig.15 In another embodiment, the coolant inflow channel 151 is continuously bent and extended from one end forming the coolant water inlet 13 to the other end. Specifically, the coolant inflow channel 151 is continuously bent and extended from one end connected to the coolant water inlet 13 to the coolant inlet 151c. Therefore, the coolant inflow channel 151 is an integrated continuous channel, and there is no need to use a plug 151b for blocking. Among them, the installation head 15 can adopt an injection molding process, and the internal coolant inflow channel 151 can be designed as a continuous stainless steel elbow. During injection molding, it is buried in the mold of the installation head 15, so that the stainless steel elbow is embedded in the injection molded installation head 15.

[0047] In some other embodiments, the coolant inflow channel 151 may not be arranged in a spiral manner inside the mounting head 15, but may be set as a channel that goes straight into the mounting head 15. After the high-temperature coolant enters the coolant inflow channel 151 from the coolant inlet 13 of the mounting head 15, it can quickly enter the fluid channel 12 of the heating tube body 16.

[0048] See also Figures 6 to 14In one embodiment, the fluid channel 12 includes a first flow channel portion 121, a first connecting portion 122 and a second connecting portion 123. The first flow channel portion 121 is arranged on the heating cylinder body 16 in an axial direction of the heating cylinder body 16 and penetrates through the heating cylinder body 16. A plurality of first flow channel portions 121 are arranged around the first urea solution filling channel 11 in a circumferential direction of the heating cylinder body 16. A plurality of first connecting portions 122 are sequentially arranged on a side of the mounting head 15 facing the heating cylinder body 16 in a circumferential direction of the mounting head 15. A plurality of second connecting portions 123 are sequentially arranged on a side of the mounting cover 17 facing the heating cylinder body 16 in a circumferential direction of the mounting cover 17. Each first connecting portion 122 sequentially connects two adjacent first flow channel portions 121 in a circumferential direction of the mounting head 15. Each second connecting portion 123 sequentially connects two adjacent first flow channel portions 121 in a circumferential direction of the mounting head 15. The first connecting portions 122 and the second connecting portions 123 are staggered. Therefore, after the high-temperature coolant enters the first first flow channel portion 121 of the heating tube body 16 from the coolant inlet 13, the coolant inflow channel 151 and the coolant inflow port 151c of the mounting head 15, it first flows along the first flow channel portion 121 toward the mounting cover 17, and then turns back through the second connecting portion 123 of the mounting cover 17 and flows along the first flow channel portion 121 and toward the mounting head 15, and then turns back through the first connecting portion 122 of the mounting head 15 and flows along the other first flow channel portion 121 and toward the mounting cover 17. This is repeated, and the high-temperature coolant continuously flows along the fluid channel 12 in the circumferential direction of the heating tube body 16, and continuously makes a turning circulation flow between the mounting head 15 and the mounting cover 17, and finally flows out from the coolant outflow port 152a, the coolant outflow channel 152 and the coolant outlet 14 of the mounting head 15.

[0049] In some other embodiments, the bending position of the fluid channel 12 may be set inside the heating tube body 16, and the mounting cover 17 may not be set; or, the rotating cover and the mounting head 15 may not be set, and the coolant inlet 13, the fluid channel 12 and the coolant outlet 14 may be set on the heating tube body 16.

[0050] See also Fig.12 and Fig.13 In one embodiment, the second communication portion 123 is in a U shape, one end of the second communication portion 123 is in communication with one of the first flow channel portions 121, and the other end of the second communication portion 123 is in communication with another of the first flow channel portions 121. Similarly, the first communication portion 122 may also be in a U shape, one end of the first communication portion 122 is in communication with one of the fluid channels 12, and the other end of the first communication portion 122 is in communication with another of the fluid channels 12. However, the shapes of the first communication portion 122 and the second communication portion 123 are not limited thereto.

[0051] See also Figure 3 and Fig. 9 In one embodiment, an anti-mistake groove 18 is provided on the outer side wall of the heating tube body 16. By providing the anti-mistake groove 18, it can play an anti-mistake role when the heating tube body 16 is assembled.

[0052] See also Figure 3 , Figure 4 and Figure 8 In one embodiment, the mounting head 15 is provided with a urea absorption pipe joint 153 and a urea return pipe joint 154, respectively, and the mounting head 15 is provided with a urea absorption channel 156 connected to the urea absorption pipe joint 153 and a urea return channel 157 connected to the urea return pipe joint 154. Further, the mounting head 15 is provided with a joint fixing plate 155, and the joint fixing plate 155 is clamped on the urea absorption pipe joint 153 and the urea return pipe joint 154, but it is not limited thereto. Among them, the urea absorption pipe joint 153 and the urea return pipe joint 154 can be integrated on the mounting head 15 and integrally injection molded. For example, when the mounting head 15 is injection molded, it has a urea absorption pipe joint 153 and a urea return pipe joint 154 made of plastic material; it can also be a urea absorption pipe joint 153 and a urea return pipe joint 154 embedded with stainless steel material. Thereby, the joint fixing plate 155 part is saved.

[0053] See also Fig. 9 and Fig.10 In one embodiment, a plurality of second urea solution filling channels 19 are arranged in the axial direction of the heating body 1 and communicated with the outside. Each second urea solution filling channel 19 is arranged around the first urea solution filling channel 11 in the circumferential direction of the heating body 1, and the second urea solution filling channel 19 is located between the first urea solution filling channel 11 and the fluid channel 12. Specifically, the second urea solution filling channel 19 is communicated with the urea solution channel M, so the second urea solution filling channel 19 is also communicated with the cavity 301a of the urea tank body 301, and the urea solution in the cavity 301a can also enter the second urea solution filling channel 19 and the first urea solution filling channel 11 through the urea solution channel M.

[0054] The number of the second urea solution filling channels 19 is eight, but not limited thereto. By providing the second urea solution filling channels 19, the diameter of the first urea solution filling channels 11 can be reduced. Even if the urea solution shakes violently when the vehicle is running, the urea solution inside the heating body 1 is little affected, thereby improving the problem of liquid level jump in the urea sensor 200 with a urea solution heating structure. At the same time, the second urea solution filling channels 19 can store urea solution, so that as much urea solution as possible can be stored in the heating cylinder body 16 of the heating body 1, thereby ensuring the amount of urea solution heated.

[0055] See also Figure 1 and Figure 3 In one embodiment, a chuck 3 is provided on the periphery of the heating body 1, and the heating body 1 is clamped on the bottom of the urea tank body 301 through the chuck 3. Specifically, the chuck 3 is provided on the periphery of the mounting head 15, and the mounting head 15 is clamped on the bottom of the urea tank body 301 through the chuck 3. However, it is not limited to this. In other embodiments, the mounting head 15 and the urea tank body can also be connected by hot plate welding to form a maintenance-free assembly, that is, the chuck 3 is cancelled, and the chuck 3 assembly is not adopted, and the hot plate welding is used to form a whole. It can also be fixed with screws and assembled in a detachable manner.

[0056] See also Figure 2 and Fig.11 In one embodiment, the heating body 1 is provided with an opening 171 connected between the upper end of the first urea solution filling channel 11 and the cavity 301a. Specifically, the opening 171 is arranged on the mounting cover 17, and a cross structure 172 is arranged on the inner wall of the opening 171, but the present invention is not limited thereto.

[0057] In addition, the mounting head 15, the heating tube body 16 and the mounting cover 17 can be made of aluminum alloy, respectively, by a casting process, and then welded and assembled into a whole. Alternatively, the mounting head 15, the heating tube body 16 and the mounting cover 17 can be made into an integrated whole by a casting process, which saves assembly steps and reduces the risk of assembly leakage.

[0058] In summary, the utility model provides a heating body 1, and a first urea solution filling channel 11 is provided in the heating body 1. Part of the urea solution in the urea tank body 301 can enter and be stored in the first urea solution filling channel 11 through the urea solution channel M. After the high-temperature coolant enters the fluid channel 12 from the coolant water inlet 13 of the heating body 1, it will flow back and forth along the fluid channel 12, and heat the urea solution inside the first urea solution filling channel 11 in the circumferential direction, thereby increasing the heating area of ​​the urea solution in the first urea solution filling channel 11. At the same time, since the fluid channel 12 is arranged around the detection device 201 in the circumferential direction of the heating body 1, the high-temperature coolant flowing in the fluid channel 12 can quickly heat the detection device 201, so that the detection device 201 is quickly thawed and quickly and effectively operated, thereby ensuring the rapid and effective operation of the SCR system.

[0059] The above disclosure is only a preferred example of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. A urea sensor with a urea solution heating structure, characterized in that: The invention comprises a heating body and a detection device, wherein a first urea solution filling channel communicating with the outside is provided in the heating body along its axial direction, the detection device is penetrated through the heating body and faces the first urea solution filling channel, and the detection device is used to detect the urea solution located in the first urea solution filling channel; a fluid channel extending and bending back and forth is also provided in the heating body along its axial direction, and the fluid channel is arranged around the first urea solution filling channel and the detection device along the circumferential direction of the heating body, and a coolant inlet and a coolant outlet are respectively provided on the outer side of the heating body, the coolant inlet is communicated with one end of the fluid channel, and the coolant outlet is communicated with the other end of the fluid channel.

2. The urea sensor with a urea solution heating structure according to claim 1, characterized in that: The heating body includes a mounting head, a heating cylinder body and a mounting cover, one axial end of the heating cylinder body is connected to the mounting head, and the other axial end of the heating cylinder body is connected to the mounting cover; the first urea solution filling channel is arranged on the heating cylinder body along the axial direction of the heating cylinder body, the detection device is penetrated by the mounting head, the fluid channel is arranged on the heating cylinder body, the mounting head and the mounting cover in a manner of bending back and forth and extending along the axial direction of the heating cylinder body, and the fluid channel is arranged around the first urea solution filling channel and the detection device along the circumferential direction of the heating cylinder body, and the coolant inlet and the coolant outlet are respectively arranged on the mounting head.

3. The urea sensor with a urea solution heating structure according to claim 2, characterized in that: A coolant inlet channel and a coolant outlet channel are respectively provided inside the mounting head, one end of the coolant inlet channel forms the coolant inlet on the outside of the mounting head, the other end of the coolant inlet channel is communicated with one end of the fluid channel, one end of the coolant outlet channel forms the coolant outlet on the outside of the mounting head, and the other end of the coolant outlet channel is communicated with the other end of the fluid channel.

4. The urea sensor with a urea solution heating structure according to claim 3, characterized in that: The coolant inflow channel is spirally arranged inside the mounting head along a circumferential direction of the mounting head.

5. The urea sensor with a urea solution heating structure according to claim 4, characterized in that: The coolant inlet channel includes a plurality of straight hole channels which are perpendicular to each other and connected in sequence along the circumferential direction of the mounting head, one end of the straight hole channel passes through the mounting head, and the other end of the straight hole channel extends to the interior of the mounting head; in the circumferential direction of the mounting head, the first straight hole channel forms the coolant inlet on the outside of the mounting head, and the ends of the remaining straight hole channels exposed to the outside are provided with plugs to seal them.

6. The urea sensor with a urea solution heating structure according to claim 4, characterized in that: The coolant inflow channel is bent and extends continuously from one end forming the coolant water inlet to the other end.

7. The urea sensor with a urea solution heating structure according to claim 2, characterized in that: The fluid channel includes a first flow channel portion, a first connecting portion and a second connecting portion, the first flow channel portion is arranged on the heating cylinder body in a penetrating manner along the axial direction of the heating cylinder body, and a plurality of the first flow channel portions are arranged around the first urea solution filling channel along the circumferential direction of the heating cylinder body; a plurality of the first connecting portions are arranged in sequence on a side of the mounting head facing the heating cylinder body along the circumferential direction of the mounting head, and a plurality of the second connecting portions are arranged in sequence on a side of the mounting cover facing the heating cylinder body along the circumferential direction of the mounting cover; each of the first connecting portions connects two adjacent first flow channel portions in sequence along the circumferential direction of the mounting head, and each of the second connecting portions connects two adjacent first flow channel portions in sequence along the circumferential direction of the mounting head, and the first connecting portions and the second connecting portions are staggered.

8. The urea sensor with a urea solution heating structure according to claim 2, characterized in that: An anti-fool groove is provided on the outer side wall of the heating cylinder body.

9. A urea tank assembly, characterized in that: The invention comprises a urea tank body and a urea sensor with a urea solution heating structure as claimed in any one of claims 1 to 8, wherein the urea tank body has a cavity for accommodating urea solution, the heating body is arranged on the bottom of the urea tank body and penetrates the cavity, and a urea solution channel communicating between the cavity and the lower end of the first urea solution filling channel is arranged in the heating body.

10. The urea tank assembly according to claim 9, characterized in that: The top plane of the detection device is lower than the bottom surface of the cavity.

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