Urea box sensor and urea box assembly

Abstract

The utility model provides a urea box sensor and urea box assembly.The urea box sensor comprises a heating main body, a first urea solution filling channel communicated with the outside is arranged in the heating main body in the axial direction of the heating main body, and a fluid channel bending and extending back and forth is further arranged in the heating main body in the axial direction of the heating main body; the fluid channel is arranged around the first urea solution filling channel in the circumferential direction of the heating body, a cooling liquid inlet, a cooling liquid outlet and a urea suction outlet are formed in the outer side of the heating body, the cooling liquid inlet communicates with one end of the fluid channel, and the cooling liquid outlet communicates with the other end of the fluid channel. The cooling liquid outlet is communicated with the other end of the fluid channel; and a urea suction channel communicated between the urea suction outlet and the first urea solution filling channel is further arranged in the heating main body. The urea box sensor can ensure quick and effective operation of an engine.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exhaust treatment, in particular to a urea tank sensor 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] In the existing technology, the widely used sensor has a heating tube that is a stainless steel round tube with N spiral turns, and a vertical stainless steel tube with built-in electrical components of different resistance values ​​in the middle, which is used to detect the liquid level height, and the probe is placed at the bottom of the spiral tube to detect the quality and temperature of the urea solution. The principle of detecting the liquid level height is to convert the resistance value corresponding to the current liquid level height into an electrical signal output according to the different resistance values ​​of different liquid level heights to obtain the specific liquid level height value. However, the existing sensor has the following problems in practical application: since the urea absorption port of the traditional sensor absorbs the external urea solution (i.e., the urea solution in the urea tank), in a low-temperature cold environment, the external urea solution is still in a low-temperature state. Although the heating structure of the sensor can heat the urea solution in the urea tank, when the urea absorption port is at a distance from the heating structure, the temperature of the urea solution near the urea absorption port takes a certain time to gradually rise and thaw, resulting in the engine connected to the urea absorption port and absorbing the urea solution through the urea absorption port cannot run quickly and effectively.

[0004] Therefore, it is necessary to provide a urea tank sensor that can ensure fast and efficient operation of the engine, and to provide a urea tank assembly having the urea tank sensor. Utility Model Content

[0005] The first purpose of the utility model is to provide a urea tank sensor which can ensure fast and effective operation of an engine.

[0006] A second object of the utility model is to provide a urea tank assembly having a urea tank sensor which can ensure fast and efficient operation of an engine.

[0007] To achieve the above-mentioned first purpose, the utility model provides a urea tank sensor, including a heating body, wherein a first urea solution filling channel connected to the outside is provided in the heating body along its axial direction, and 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 along the circumferential direction of the heating body, and a coolant inlet, a coolant outlet and a urea absorption outlet are respectively provided on the outside of the heating body, the coolant inlet is connected to one end of the fluid channel, and the coolant outlet is connected to the other end of the fluid channel; a urea absorption channel connected between the urea absorption outlet and the first urea solution filling channel is also provided inside the heating body.

[0008] Compared with the prior art, the urea tank sensor 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. Therefore, after the high-temperature coolant enters the fluid channel from the coolant inlet of the heating body, it will bend and flow back and forth along the fluid channel, and flow in the circumferential direction of the first urea solution filling channel. The urea solution inside it is heated upward, which fully prolongs the heat conduction path of the high-temperature coolant, increases the heating area of ​​the urea solution in the first urea solution filling channel, and makes the urea solution in the first urea solution filling channel quickly heated up and thawed. Then, a urea absorption channel connected between the urea absorption outlet and the first urea solution filling channel is provided in the heating body, so that the engine absorbs the urea solution in the first urea solution filling channel through the urea absorption channel. Since the urea solution in the first urea solution filling channel can be quickly heated up and thawed, the engine can be ensured to run quickly and effectively.

[0009] Preferably, a urea absorption inlet is further provided on the outer side of the heating body, and the urea absorption inlet is arranged at a position close to the fluid channel, and the urea absorption inlet is communicated with the urea absorption channel.

[0010] Preferably, the urea tank sensor further comprises a filter assembly, wherein the filter assembly is wrapped around the outside of the heating body, and the filter assembly covers the connection between the urea absorption inlet and / or the first urea solution filling channel and the outside.

[0011] Preferably, a urea absorption pipe is provided on the heating body, the urea absorption pipe is inserted into the filter assembly, and the urea absorption inlet is formed on one end of the urea absorption pipe inserted into the filter assembly.

[0012] Preferably, 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 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 along the circumferential direction of the heating cylinder body, the coolant inlet, the coolant outlet, the urea absorption outlet and the urea absorption inlet are respectively arranged on the mounting head, and the urea absorption inlet is close to the heating cylinder body.

[0013] 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.

[0014] Preferably, the coolant inflow channel is spirally arranged inside the mounting head along the circumferential direction of the mounting head.

[0015] 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.

[0016] Preferably, the coolant inlet channel bends and extends continuously from one end forming the coolant inlet to the other end.

[0017] 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.

[0018] Preferably, the urea tank sensor also includes a detection device, which is penetrated by the heating body and faces the first urea solution filling channel, and is used to detect the urea solution in the first urea solution filling channel; the structure of the fluid channel close to the detection device is arranged around the detection device along the circumferential direction of the heating body.

[0019] 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, the urea tank body having a cavity for accommodating urea solution, the heating body being arranged on the urea tank body and passing through the cavity, and the first urea solution filling channel being connected to the cavity.

[0020] Compared with the prior art, the urea tank assembly of the utility model has a urea tank sensor, and the urea tank sensor 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 body, part of the urea solution in the urea tank body 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 bend back and forth along the fluid channel and flow in the first urea solution filling channel. The urea solution in the solution filling channel is heated in the circumferential direction thereof, which fully prolongs the heat conduction path of the high-temperature coolant, increases the heating area of ​​the urea solution in the first urea solution filling channel, and enables the urea solution in the first urea solution filling channel to be quickly heated up and thawed. A urea absorption channel connected between the urea absorption outlet and the first urea solution filling channel is provided in the heating body, so that the engine absorbs the urea solution in the first urea solution filling channel through the urea absorption channel. Since the urea solution in the first urea solution filling channel can be quickly heated up and thawed, the engine can be ensured to run quickly and effectively.

[0021] Preferably, the heating body is arranged on the top of the urea tank body and penetrates the cavity from top to bottom.

[0022] Preferably, the heating body is arranged at the bottom of the urea tank body and penetrates the cavity from bottom to top, and a urea solution channel communicating between the cavity and the lower end of the first urea solution filling channel is provided in the heating body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of the urea sensor of the utility model.

[0024] Figure 2 yes Figure 1 A cross-sectional view of a urea sensor is shown.

[0025] Figure 3 yes Figure 1 Exploded view of the urea sensor shown.

[0026] Figure 4 yes Figure 1 A top view of the urea sensor is shown.

[0027] Figure 5 It is a front view of the mounting head of the urea sensor of the utility model.

[0028] Figure 6 is along Figure 5 Cross-sectional view along the AA direction.

[0029] Figure 7 It is a bottom view of the mounting head of the urea sensor of the present utility model.

[0030] Figure 8 It is a three-dimensional structural diagram of the heating cylinder body of the urea sensor of the present utility model.

[0031] Fig. 9 yes Figure 8 A side view of the heater cartridge body of a urea sensor is shown.

[0032] Fig.10 It is a three-dimensional structural diagram of the installation cover of the urea sensor of the utility model.

[0033] Fig.11 It is a model diagram of a coolant inflow channel, a fluid channel and a coolant outflow channel inside the urea sensor of the utility model.

[0034] Fig.12 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 of the utility model.

[0035] Fig.13 It is a structural diagram of the fluid channel inside the urea sensor of the utility model surrounding the detection device.

[0036] Fig.14 It is a three-dimensional structural diagram of another embodiment of the urea sensor of the utility model.

[0037] Fig.15 yes Fig.14 Partial structural diagram of the urea sensor shown.

[0038] Fig.16 It is a structural diagram of another embodiment of the urea sensor of the utility model.

[0039] Fig.17 yes Fig.16 Enlarged view of point A in the middle.

[0040] Fig.18 It is a structural diagram when the urea sensor of the utility model is arranged on the top of the urea tank body.

[0041] Fig.19 This is a structural diagram of a urea sensor of the utility model when it is arranged at the bottom of a urea tank body. DETAILED DESCRIPTION

[0042] 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 embodiments and the accompanying drawings.

[0043] See also Figure 1 , Figure 2 , Fig.11 , Fig.14 as well as Fig.15 The urea tank assembly of the utility model includes a urea tank body 301 and a urea sensor 200. The urea sensor 200 includes a heating body 1, wherein a first urea solution filling channel 11 communicating with the outside is provided in the heating body 1 along its axial direction, and 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 along the circumferential direction of the heating body 1, and a coolant inlet 13, a coolant outlet 14 and a urea absorption outlet 4 are respectively provided on the outside of the heating body 1, and 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; and a urea absorption channel 5 communicating between the urea absorption outlet 4 and the first urea solution filling channel 11 is also provided inside the heating body 1. The urea tank body 301 has a cavity 301 a for accommodating urea solution. The heating body 1 is disposed on the urea tank body 301 and penetrates the cavity 301 a. The first urea solution filling channel 11 is communicated with the cavity 301 a.

[0044] The heating cylinder structure 100 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 in the first urea solution filling channel 11. The urea solution in the first urea solution filling channel 11 is heated in the circumferential direction thereof, which fully prolongs the heat conduction path of the high-temperature coolant, increases the heating area of ​​the urea solution in the first urea solution filling channel 11, and makes the urea solution in the first urea solution filling channel 11 quickly heated up and thawed. Then, a urea absorbing channel 5 connected between the urea absorbing outlet 4 and the first urea solution filling channel 11 is provided in the heating body 1, so that the engine absorbs the urea solution in the first urea solution filling channel 11 through the urea absorbing channel 5. Since the urea solution in the first urea solution filling channel 11 can be quickly heated up and thawed, the engine can be ensured to run quickly and effectively.

[0045] See also Fig.18 In one embodiment, the heating body 1 is disposed on the top of the urea tank body 301 and penetrates the cavity 301a from top to bottom.

[0046] See also Fig.19In one embodiment, the heating body 1 is disposed on the bottom of the urea tank body 301 and penetrates the cavity 301a from bottom to top. A urea solution channel M is provided in the heating body 1 and communicates between the cavity 301a and the lower end of the first urea solution filling channel 11. 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 liquid level of the first urea solution filling channel 11 in the heating body 1 is consistent with that of the urea solution in the external cavity 301a.

[0047] See also Fig.14 and Fig.15 The outer side of the heating body 1 is also provided with a urea absorption inlet 6, and the urea absorption inlet 6 is arranged at a position close to the fluid channel 12, and the urea absorption inlet 6 is communicated with the urea absorption channel 5. Since the urea absorption inlet 6 is communicated with the urea absorption channel 5, the external urea solution can enter the urea absorption channel 5 through the urea absorption inlet 6, so that the engine can also absorb the external urea solution through the urea absorption outlet 4, the urea absorption channel 5 and the urea absorption inlet 6. And by arranging the urea absorption inlet 6 at a position close to the fluid channel 12, the urea absorption inlet 6 absorbs the urea solution from the outside at a position close to the fluid channel 12, and the urea solution at a position close to the fluid channel 12 can be quickly heated and thawed by the high-temperature coolant in the fluid channel 12, further ensuring the rapid and effective operation of the engine.

[0048] See also Fig.14 , Fig.16 and Fig.17 The urea sensor 200 of the present invention further includes a filter assembly 2, which is wrapped around the outside of the heating body 1, and covers the connection between the urea absorption inlet 6 and / or the first urea solution filling channel 11 and the outside.

[0049] In one embodiment, if Fig.14 As shown, the filter assembly 2 covers the connection between the urea absorption inlet 6 and the first urea solution filling channel 11 and the outside, so the external urea solution needs to be filtered by the filter assembly 2 before entering the urea absorption inlet 6 and the first urea solution filling channel.

[0050] In one embodiment, if Fig.16 and Fig.17 As shown, the filter assembly 2 covers the urea absorption inlet 6, so the external urea solution needs to be filtered by the filter assembly 2 before entering the urea absorption inlet 6. Further, the heating body 1 is provided with a urea absorption pipe 7, which is inserted into the filter assembly 2, and the urea absorption inlet 6 is formed on one end of the urea absorption pipe 7 inserted into the filter assembly 2. The number of urea absorption inlets 6 can be several, such as one, two or three, etc.

[0051] See also Figures 1 to 3 ,as well as Fig.11 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, by fully extending the heat conduction path of the high-temperature coolant, the heating and thawing efficiency of the urea solution is effectively improved.

[0052] Optionally, the mounting head 15 , the heating tube body 16 and the mounting cover 17 are an integrated structure.

[0053] 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.

[0054] 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. 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.

[0055] See also Figure 1 , Figure 6 and Fig.12In 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.

[0056] See also Figure 5 and Figure 6 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 heat conduction efficiency.

[0057] See also Figure 5 , Figure 6 and Fig.11 In 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.

[0058] See also Fig.12In 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.

[0059] 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.

[0060] See also Figures 5 to 12In 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.

[0061] 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.

[0062] In some embodiments, the second communication portion 123 may be 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.

[0063] See also Figure 1 and Figure 8In 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.

[0064] See also Figure 1 , Figure 3 and Figure 7 In one embodiment, a urea absorption pipe joint 153 and a urea return pipe joint 154 are respectively provided on the mounting head 15. The urea absorption pipe joint 153 is connected to the urea absorption outlet 4, so the urea absorption pipe joint 153 can be connected to the urea absorption channel 5, and the urea return pipe joint 154 is connected to the urea return channel 157 in the mounting head 15. Among them, a urea return pipe 8 can also be provided on the mounting head, and the urea return pipe 8 is connected to the urea return channel 157 in the mounting head 15, and the urea return pipe 8 is used to extend into the cavity 301a of the urea tank body 301. Further, a joint fixing plate 155 is provided on the mounting head 15, 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, the mounting head 15 may be provided with a urea absorbing pipe joint 153 and a urea return pipe joint 154 made of plastic material during injection molding, or may be provided with a urea absorbing pipe joint 153 and a urea return pipe joint 154 made of embedded stainless steel material, thereby saving the joint fixing plate 155 parts.

[0065] See also Figure 8 and Fig. 9 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.

[0066] 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. 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.

[0067] See also Figure 1 and Fig.19 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.

[0068] See also Figure 2 and Fig.10 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.

[0069] 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.

[0070] See also Figure 1 , Figure 4 and Fig.13The urea sensor 200 further includes a detection device 201, which is disposed 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. The structure of the fluid channel 12 close to the detection device 201 is arranged around the detection device 201 along the circumferential direction of the heating body 1. By setting the structure of the fluid channel 12 close to the detection device 201 to be arranged around the detection device 201 along the circumferential direction of the heating body 1, the fluid channel 12 can quickly heat and thaw the detection device 201, which is conducive to the rapid and effective operation of the detection device 201. 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 height. In addition, since the urea solution is divided into the interior and the periphery by the heating body 1, and the diameter of the first urea solution filling channel 11 inside 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.

[0071] In summary, the urea tank sensor 200 of the utility model is provided with a heating body 1, and a first urea solution filling channel is provided in the heating body 1. Part of the urea solution in the urea tank body 301 can be stored in the first urea solution filling channel 11. By providing a fluid channel 12 in the circumferential direction of the first urea solution filling channel 11, after the high-temperature coolant enters the fluid channel 12 from the coolant water inlet 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, so that the heat conduction path of the high-temperature coolant is fully extended, so that the urea solution in the first urea solution filling channel 11 is quickly heated and thawed. Then, by providing a urea absorption channel 5 connected between the urea absorption outlet 4 and the first urea solution filling channel 11 in the heating body 1, the engine absorbs the urea solution in the first urea solution filling channel 11 through the urea absorption channel 5. Since the urea solution in the first urea solution filling channel 11 can be quickly heated and thawed, the engine can be ensured to run quickly and effectively. In addition, 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 height. In addition, since the urea solution is divided into the interior and the periphery by the heating body 1, and the diameter of the first urea solution filling channel 11 inside 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.

[0072] 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 within the scope of the present invention.

Claims

1. A urea tank sensor, characterized in that: The heating body comprises a heating main body, wherein a first urea solution filling channel communicating with the outside is provided in the axial direction of the heating main body, a fluid channel extending and bending back and forth is also provided in the axial direction of the heating main body, and the fluid channel is arranged around the first urea solution filling channel in the circumferential direction of the heating main body, a coolant inlet, a coolant outlet and a urea absorption outlet are respectively provided on the outside of the heating main 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; a urea absorption channel communicating between the urea absorption outlet and the first urea solution filling channel is also provided inside the heating main body.

2. The urea tank sensor according to claim 1, characterized in that: A urea absorption inlet is also provided on the outer side of the heating body, and the urea absorption inlet is arranged at a position close to the fluid channel, and the urea absorption inlet is communicated with the urea absorption channel.

3. The urea tank sensor according to claim 2, characterized in that: It also includes a filter assembly, which is wrapped around the outside of the heating body and covers the connection between the urea absorption inlet and / or the first urea solution filling channel and the outside.

4. The urea tank sensor according to claim 3, characterized in that: The heating body is provided with a urea absorption pipe, the urea absorption pipe is inserted into the filter assembly, and the urea absorption inlet is formed on one end of the urea absorption pipe inserted into the filter assembly.

5. The urea tank sensor according to claim 2, 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 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 along the circumferential direction of the heating cylinder body, the coolant inlet, the coolant outlet, the urea absorption outlet and the urea absorption inlet are respectively arranged on the mounting head, and the urea absorption inlet is close to the heating cylinder body.

6. The urea tank sensor according to claim 5, 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.

7. The urea tank sensor according to claim 6, characterized in that: The coolant inflow channel is spirally arranged inside the mounting head along a circumferential direction of the mounting head.

8. The urea tank sensor according to claim 7, 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.

9. The urea tank sensor according to claim 7, characterized in that: The coolant inflow channel is bent and extends continuously from one end forming the coolant water inlet to the other end.

10. The urea tank sensor according to claim 5, 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.

11. The urea tank sensor according to claim 1, characterized in that: It also includes a detection device, which is penetrated by the heating body and faces the first urea solution filling channel, and is used to detect the urea solution in the first urea solution filling channel; the structure of the fluid channel close to the detection device is arranged around the detection device along the circumferential direction of the heating body.

12. A urea tank assembly, characterized in that: It comprises a urea tank body and a urea tank sensor as claimed in any one of claims 1 to 11, wherein the urea tank body has a cavity for accommodating urea solution, the heating body is arranged on the urea tank body and penetrates the cavity, and the first urea solution filling channel is connected to the cavity.

13. The urea tank assembly according to claim 12, characterized in that: The heating body is arranged on the top of the urea tank body and penetrates the cavity from top to bottom.

14. The urea tank assembly according to claim 12, characterized in that: The heating body is arranged at the bottom of the urea tank body and penetrates the cavity from bottom to top. 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.

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