High-pressure-resistant urea sensor and urea tank

Abstract

The utility model provides a high pressure resistant urea sensor which comprises a plastic head, a connecting pipe and a metal gasket, the lower portion of the plastic head is provided with a mounting portion used for being connected to a urea tank, and the plastic head is provided with a connecting hole; the connecting pipe is connected into the connecting hole, and the connecting pipe is used for being communicated with the interior of the urea tank; and the metal gasket is arranged at the upper part of the plastic head. According to the high-pressure-resistant urea sensor, the plastic head is adopted, and the mounting part of the plastic head is connected to the urea tank, so that the sensor is insulated from the urea tank, and the problem that the sensor is burnt out due to grounding current is avoided; furthermore, the high-pressure-resistant urea sensor adopts a structure of a plastic head and a metal gasket, so that the anti-vibration performance of the sensor is met, the head strength of the sensor can be increased, the sensor can not deform in various environments, and the sealing performance between the sensor and a urea tank is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a high-pressure urea sensor and a urea tank. Background Art

[0002] In gas-assisted vehicle exhaust treatment systems, a urea tank sprays urea to the urea nozzle under high pressure, reaching a pressure of 8 bar. Under these conditions, the tank and its components, including the sensor, are subjected to immense pressure. Conventional urea sensors are all-metal, with the tube and flange welded together. However, this structure presents the following failure issues: 1. Under high pressure, conventional sensors struggle to simultaneously meet high-pressure tolerance requirements and address stress cracking in the metal welds. The sensor exhibits poor vibration resistance, and the weld between the tube and flange creates a significant risk of cracking when the urea sensor is subjected to vibration. Vibration can also cause deformation in the sensor, making it difficult to ensure a seal between the sensor and the urea tank. 2. The all-metal structure of the urea sensor, with no insulation between it and the metal urea tank, creates the risk of ground current damaging the sensor. 3. The filter, a maintenance component of the urea sensor, requires replacement or cleaning after a certain mileage. However, conventional urea sensor filters are difficult to replace and maintain.

[0003] Therefore, it is necessary to provide at least one high-pressure urea sensor to avoid the problem of burning the sensor due to the presence of ground current, and to increase the strength of the sensor while meeting the anti-vibration performance of the sensor. Utility Model Content

[0004] The first purpose of the present utility model is to provide a high-pressure urea sensor to avoid the problem of burning the sensor due to the existence of ground current, and to increase the strength of the sensor while meeting the anti-vibration performance of the sensor.

[0005] A second object of the present utility model is to provide a urea tank having a high-pressure urea sensor and a urea tank, so as to solve the problem of pipe cracking due to vibration.

[0006] To achieve the above-mentioned first purpose, the utility model provides a high-pressure urea sensor, including a plastic head, a connecting pipe and a metal gasket. The lower part of the plastic head has a mounting portion for connecting to a urea tank, and the plastic head is provided with a connecting hole; the connecting pipe is connected to the connecting hole, and the connecting pipe is used to communicate with the interior of the urea tank; the metal gasket is arranged on the upper part of the plastic head.

[0007] Compared with the prior art, the high-pressure urea sensor of the present invention adopts a plastic head, and the mounting portion of the plastic head is connected to the urea tank, thereby insulating the sensor and the urea tank to avoid the problem of burning the sensor due to the existence of ground current; in addition, the high-pressure urea sensor of the present invention adopts a structure of a plastic head plus a metal gasket, which not only meets the anti-vibration performance of the sensor, but also increases the strength of the sensor head, so that the sensor will not deform in various environments, ensuring the sealing between the sensor and the urea tank.

[0008] Preferably, a connecting sleeve is provided on the outer wall of the connecting pipe, and one end of the connecting sleeve is inserted into the lower end of the connecting hole and is threadedly connected to the connecting hole.

[0009] Preferably, the high-pressure urea sensor further includes a sealing ring, which is sleeved on the outside of the connecting pipe and located in the connecting hole, and is used to seal the gap between the outer wall of the connecting pipe and the inner wall of the connecting hole.

[0010] Preferably, the sealing ring is a double-layer sealing ring.

[0011] Preferably, the high-pressure urea sensor also includes a half-axle sleeve, the connecting pipe is arranged in a penetrating manner in the connecting hole, the outer side wall of the connecting pipe is provided with a bulge along its circumferential direction, the two half-axle sleeves are symmetrically sleeved on the bulge and the outer side wall of the connecting pipe, and the two half-axle sleeves are spliced ​​together and arranged in the connecting hole.

[0012] Preferably, one end of the half-axle sleeve is provided with a pin, and the other end of the half-axle sleeve is provided with a socket; when the two half-axle sleeves are spliced ​​together, the pin of the half-axle sleeve is correspondingly inserted into the socket of the other half-axle sleeve.

[0013] Preferably, the high-pressure urea sensor further includes a fixing plate, which is fixed to the upper portion of the plastic head, and the fixing plate is located above the connecting hole and presses the half-axle sleeve.

[0014] Preferably, the connecting pipe includes a water pipe and a urea pipe, the connecting hole includes a first cooling hole, a second cooling hole and a urea hole, one end of the water pipe is inserted into the first cooling hole, the other end of the water pipe is inserted into the second cooling hole, and one end of the urea pipe is inserted into the urea hole.

[0015] Preferably, the high-pressure urea sensor further includes a filter assembly, which is arranged on the plastic head. The interior of the filter assembly is provided with a urea channel connected to the urea hole, a first cooling channel connected to the first cooling hole, and a second cooling channel connected to the second cooling hole.

[0016] Preferably, the filter assembly includes a filter housing, a filter body, a filter front cover and a filter rear cover, the urea channel, the first cooling channel and the second cooling channel are respectively formed in the filter housing, the filter body is arranged in the urea channel, and the filter front cover and the filter rear cover are respectively arranged at the front end and the rear end of the filter housing.

[0017] Preferably, the filter assembly further includes a first cooling pipe joint and a second cooling pipe joint, one end of the first cooling pipe joint is inserted into the first cooling channel, and one end of the second cooling pipe joint is inserted into the second cooling channel.

[0018] Preferably, the filter assembly further includes a heat conducting member, and the heat conducting member is clamped on the first cooling pipe joint and the second cooling pipe joint.

[0019] Preferably, the high-pressure urea sensor further includes a pressure sensor, which is provided on the filter assembly and is used to detect the working pressure of the urea pipe.

[0020] To achieve the above-mentioned second objective, the present invention provides a urea tank, comprising a urea tank body and the above-mentioned high-pressure urea sensor. The urea tank body has an accommodating space for accommodating urea. The urea tank body is provided with a mounting hole connected to the accommodating space. The mounting portion of the plastic head is connected to the mounting hole and is insulated from the urea tank body. The connecting pipe is inserted into the accommodating space and is connected to the accommodating space.

[0021] Compared with the prior art, the urea tank of the present invention is provided with a high-pressure urea sensor. The high-pressure urea sensor adopts a plastic head, and the mounting portion of the plastic head is connected to the urea tank body, thereby insulating the sensor and the urea tank body to avoid the problem of burning the sensor due to the existence of ground current. In addition, the high-pressure urea sensor of the present invention adopts a structure of a plastic head and a metal gasket, which not only meets the anti-vibration performance of the sensor, but also increases the strength of the sensor head, so that the sensor does not deform in various environments, thereby ensuring the sealing between the sensor and the urea tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural diagram of the high-pressure urea sensor of the present utility model.

[0023] Figure 2 yes Figure 1 A cross-sectional view of a high-pressure urea sensor is shown.

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0025] Figure 4 This is an exploded view of the plastic head and metal gasket of the high-pressure urea sensor of the present invention.

[0026] Figure 5 This is an exploded view of the two halves of the shaft sleeve of the high-pressure urea sensor of the utility model.

[0027] Figure 6 It is a cross-sectional view of the urea tank of the present utility model.

[0028] Figure 7 It is a cross-sectional view of another embodiment of the high-pressure urea sensor of the present invention.

[0029] Figure 8 yes Figure 7 The partial structural diagram of the high-pressure urea sensor shown.

[0030] Figure 9 It is a structural diagram of another embodiment of the plastic head of the high-pressure urea sensor of the present invention.

[0031] Figure 10 This is an exploded view of the filter assembly of the high-pressure urea sensor of the present invention. DETAILED DESCRIPTION

[0032] In order to explain the technical content and structural features of the present invention in detail, the following is a further description in conjunction with the embodiments and the accompanying drawings.

[0033] See also Figure 1 、 Figure 2 、 Figure 4 and Figure 6 The urea tank 200 of the present invention includes a urea tank body 201 and a high-pressure urea sensor 100. The high-pressure urea sensor 100 comprises a plastic head 1, a connecting pipe 2, and a metal gasket 3. The lower portion of the plastic head 1 has a mounting portion 11 for connecting to the urea tank 200. The plastic head 1 is provided with a connecting hole 12. The connecting pipe 2 is connected to the connecting hole 12 and communicates with the interior of the urea tank 200. The metal gasket 3 is disposed on the upper portion of the plastic head 1. The urea tank body 201 has a accommodating space 201a for accommodating urea. The urea tank body 201 is provided with a mounting hole 201b that communicates with the accommodating space 201a. The mounting portion 11 of the plastic head 1 is connected to the mounting hole 201b and is insulated from the urea tank body 201. The connecting pipe 2 is inserted into and communicates with the accommodating space 201a.

[0034] The high-pressure urea sensor 100 of the present invention adopts a plastic head 1. When the plastic head 1 is connected to the urea tank body 201, the high-pressure urea sensor 100 and the urea tank 201 can be insulated to avoid the problem of burning the sensor due to the existence of ground current. In addition, the high-pressure urea sensor 100 of the present invention adopts a structure of a plastic head 1 plus a metal gasket 3. While meeting the anti-vibration performance of the sensor, the head strength of the sensor can also be increased, so that the sensor will not deform in various environments, thereby ensuring the sealing between the high-pressure urea sensor 100 and the urea tank 200.

[0035] See also Figure 2 and Figure 3 In one embodiment, a connecting sleeve 4 is provided on the outer wall of the connecting tube 2. One end of the connecting sleeve 4 is inserted into the lower end of the connecting hole 12 and threadedly connected to the connecting hole 12. Specifically, the connecting tube 2 is an integrally molded structure. The plastic head 1 and the connecting sleeve 4 are used to fix the integrally molded connecting tube 2, which can solve the problem of cracking of the connecting tube 2 due to vibration.

[0036] Please continue reading Figure 2 and Figure 3 Furthermore, the high-pressure urea sensor 100 of the present invention also includes a sealing ring 41. The sealing ring 41 is disposed on the outside of the connecting pipe 2 and located within the connecting hole 12. The sealing ring 41 is used to seal the gap between the outer wall of the connecting pipe 2 and the inner wall of the connecting hole 12. Preferably, the sealing ring 41 is a double-layer sealing ring, but the present invention is not limited thereto. Specifically, the sealing ring 41 is located above the connecting sleeve 4.

[0037] See also Figure 2 、 Figure 3 and Figure 5 Furthermore, the high-pressure urea sensor 100 of the present invention further includes a half-sleeve 42. The connecting tube 2 is disposed throughout the connecting hole 12. The outer wall of the connecting tube 2 is provided with a convex bump 21 along its circumferential direction. The two half-sleeves 42 are symmetrically mounted on the convex bump 21 and the outer wall of the connecting tube 2. The two half-sleeves 42 are spliced ​​together and disposed in the connecting hole 12. By providing the convex bump 21 on the outer wall of the half-sleeve 42 and wrapping it with the half-sleeve 42, the installation position of the connecting tube 2 on the plastic head 1 is restricted. Specifically, one end of the half-sleeve 42 is provided with a latch 421, and the other end of the half-sleeve 42 is provided with a socket 422. When the two half-sleeves 42 are spliced ​​together, the latch 421 of one half-sleeve 42 is correspondingly inserted into the socket 422 of the other half-sleeve 42, thereby firmly splicing the two half-sleeves 42 together. However, the splicing method of the two half-sleeves 42 is not limited to this.

[0038] See also Figures 1 to 3Furthermore, the high-pressure urea sensor 100 of the present invention further includes a fixing plate 43 fixed to the upper portion of the plastic head 1. The fixing plate 43 is located above the connecting hole 12 and presses against the half-axle sleeve 42. The fixing plate 43 presses against the half-axle sleeve 42 to prevent it from loosening and falling off, thereby more firmly fixing the connection pipe 2 on the plastic head 1.

[0039] It is worth noting that the connection tube 2 is not limited to being disposed through the connection hole 12. In other embodiments, the connection tube 2 may also have its end connected to the connection hole 12. There may be one or more connection tubes 2. When there are multiple connection tubes 2, some of the connection tubes 2 may be disposed through the connection hole 12, while the ends of some of the connection tubes 2 may be connected to the connection hole 12. The types and uses of the connection tubes 2 may also vary. For example, the connection tube 2 may be a pipe for cooling water flow, a pipe for urea flow, or a pipe for wiring.

[0040] See also Figures 7 to 9 In one embodiment, the connecting pipe 2 includes a water pipe 22 and a urea pipe 23, and the connecting hole 12 includes a first cooling hole 121, a second cooling hole 122 and a urea hole 123. One end of the water pipe 22 is inserted into the first cooling hole 121, and the other end of the water pipe 22 is inserted into the second cooling hole 122. One end of the urea pipe 23 is inserted into the urea hole 123.

[0041] See also Figures 7 to 10Furthermore, the high-pressure urea sensor 100 of the present invention also includes a filter assembly 5, which is mounted on the plastic head 1. The filter assembly 5 includes a urea channel 511 communicating with the urea hole 123, a first cooling channel 512 communicating with the first cooling hole 121, and a second cooling channel 513 communicating with the second cooling hole 122. Urea within the accommodating space 201a of the urea tank 200 can enter the urea channel 511 of the filter assembly 5 through the urea pipe 23. The filter assembly 5 can be connected to an external pipeline, and the urea is filtered by the filter assembly 5 before entering the external pipeline. Since the filter assembly 5 also includes a first cooling channel 512 and a second cooling channel 513, the cooling water path formed by the first cooling channel 512, the first cooling holes 121, the second cooling channel 513, the second cooling holes 122, and the water pipe 22 can thaw the frozen urea in the urea channel 511, ensuring that urea can effectively pass through the urea channel 511 of the filter assembly 5 and enter the external pipeline in cold weather. Specifically, the filter assembly 5 includes a filter housing 51, a filter body 52, a filter front cover 53, and a filter rear cover 54. The urea channel 511, the first cooling channel 512, and the second cooling channel 513 are respectively formed in the filter housing 51. The filter body 52 is disposed in the urea channel 511. The filter front cover 53 and the filter rear cover 54 are respectively disposed at the front and rear ends of the filter housing 51.

[0042] See also Figure 10 Furthermore, the filter assembly 5 further includes a first cooling pipe joint 55 and a second cooling pipe joint 56. One end of the first cooling pipe joint 55 is inserted into the first cooling channel 512, and one end of the second cooling pipe joint 56 is inserted into the second cooling channel 513. The first cooling pipe joint 55 and the second cooling pipe joint 56 can be connected to an external pipeline to implement a cooling circuit circulation, but the present invention is not limited thereto.

[0043] Please continue reading Figure 10 Furthermore, the filter assembly 5 also includes a heat conductor 57, which is clamped on the first cooling pipe joint 55 and the second cooling pipe joint 56. The heat conductor 57 is used to conduct heat between the first cooling pipe joint 55 and the second cooling pipe joint 56 to achieve a rapid cooling effect through heat exchange.

[0044] Please continue reading Figure 10 Furthermore, the high-pressure urea sensor 100 also includes a pressure sensor 6, which is arranged on the filter assembly 5 and is used to detect the working pressure of the urea pipe 23. The working pressure obtained by the pressure sensor 6 when detecting the urea pipe 23 is also the internal pressure of the urea tank body 201.

[0045] In summary, the urea tank 200 of the present invention is equipped with a high-pressure urea sensor 100. This high-pressure urea sensor 100 utilizes a plastic head 1, and is connected to the urea tank body 201 using the mounting portion 11 of the plastic head 1. This insulates the sensor from the urea tank body 201, thereby preventing the sensor from burning out due to ground current. Furthermore, the high-pressure urea sensor 100 of the present invention utilizes a structure of a plastic head 1 plus a metal gasket 3. This structure not only meets the sensor's vibration resistance requirements, but also increases the strength of the sensor head, preventing the sensor from deforming under various conditions and ensuring a tight seal between the sensor and the urea tank body 201. Furthermore, the high-pressure urea sensor 100 of the present invention utilizes a structure of a plastic head 1 plus a connecting sleeve 4 to secure the integrally formed connecting pipe 2, effectively addressing the problem of cracking of the connecting pipe 2 due to vibration. Furthermore, the high-pressure urea sensor 100 of the present invention is provided with a filter assembly on the plastic head 1, and a urea channel 511 communicating with the urea hole 123, a first cooling channel 512 communicating with the first cooling hole 121, and a second cooling channel 513 communicating with the second cooling hole 122 are provided inside the filter assembly 5. The cooling water path formed by the first cooling channel 512, the first cooling hole 121, the second cooling channel 513, and the second cooling hole 122 can thaw the frozen urea in the urea channel 511, ensuring that urea can effectively pass through the urea channel 511 of the filter assembly 5 and enter the external pipeline in cold weather.

[0046] The above disclosure is only a preferred embodiment of the present invention and cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope covered by the present invention.

Claims

1. A high-pressure urea sensor, characterized in that: include: A plastic head, wherein the lower portion of the plastic head has a mounting portion for connecting to a urea tank, and the plastic head is provided with a connecting hole; a connecting pipe connected to the connecting hole and used to communicate with the interior of the urea tank; A metal gasket is arranged on the upper part of the plastic head.

2. The high-pressure urea sensor according to claim 1, characterized in that: The outer wall of the connecting pipe is sleeved with a connecting sleeve, one end of which is inserted into the lower end of the connecting hole and is threadedly connected to the connecting hole.

3. The high-pressure urea sensor according to claim 2, characterized in that: It also includes a sealing ring, which is sleeved on the outside of the connecting pipe and located in the connecting hole. The sealing ring is used to seal the gap between the outer wall of the connecting pipe and the inner wall of the connecting hole.

4. The high-pressure urea sensor according to claim 3, characterized in that: The sealing ring is a double-layer sealing ring.

5. The high-pressure urea sensor according to claim 2, characterized in that: It also includes a half-axle sleeve, the connecting pipe is arranged in a penetrating manner in the connecting hole, the outer wall of the connecting pipe is provided with a bulge along its circumferential direction, the two half-axle sleeves are symmetrically arranged on the bulge and the outer wall of the connecting pipe, and the two half-axle sleeves are spliced ​​together and arranged in the connecting hole.

6. The high-pressure urea sensor according to claim 5, characterized in that: One end of the half-axle sleeve is provided with a pin, and the other end of the half-axle sleeve is provided with a socket; when the two half-axle sleeves are spliced ​​together, the pin of the half-axle sleeve is correspondingly inserted into the socket of the other half-axle sleeve.

7. The high-pressure urea sensor according to claim 5, characterized in that: It also includes a fixing plate, which is fixed to the upper part of the plastic head, and the fixing plate is located above the connecting hole and presses the half-axle sleeve.

8. The high-pressure urea sensor according to claim 1, characterized in that: The connecting pipe includes a water pipe and a urea pipe, the connecting hole includes a first cooling hole, a second cooling hole and a urea hole, one end of the water pipe is inserted into the first cooling hole, the other end of the water pipe is inserted into the second cooling hole, and one end of the urea pipe is inserted into the urea hole.

9. The high-pressure urea sensor according to claim 8, characterized in that: It also includes a filter assembly, which is arranged on the plastic head. The interior of the filter assembly is provided with a urea channel connected to the urea hole, a first cooling channel connected to the first cooling hole, and a second cooling channel connected to the second cooling hole.

10. The high-pressure urea sensor according to claim 9, characterized in that: The filter assembly includes a filter housing, a filter body, a filter front cover and a filter rear cover. The urea channel, the first cooling channel and the second cooling channel are respectively formed in the filter housing. The filter body is arranged in the urea channel. The filter front cover and the filter rear cover are respectively arranged at the front end and the rear end of the filter housing.

11. The high-pressure urea sensor according to claim 10, characterized in that: The filter assembly further includes a first cooling pipe joint and a second cooling pipe joint, one end of the first cooling pipe joint is plugged into the first cooling channel, and one end of the second cooling pipe joint is plugged into the second cooling channel.

12. The high-pressure urea sensor according to claim 11, characterized in that: The filter assembly further includes a heat conducting member, which is clamped on the first cooling pipe joint and the second cooling pipe joint.

13. The high-pressure urea sensor according to claim 9, characterized in that: It also includes a pressure sensor, which is arranged on the filter assembly and is used to detect the working pressure of the urea pipe.

14. A urea tank, characterized in that: The high-pressure urea sensor comprises a urea tank body and the high-pressure urea sensor according to any one of claims 1 to 13, wherein the urea tank body has an accommodating space for accommodating urea, the urea tank body is provided with a mounting hole communicating with the accommodating space, the mounting portion of the plastic head is connected to the mounting hole and insulated from the urea tank body, and the connecting pipe is inserted into the accommodating space and communicates with the accommodating space.

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