Urea quality sensor structure with upper filter

Abstract

The utility model discloses a urea quality sensor structure with an upper filter, which belongs to the technical field of urea quality sensors of automobile post-processing systems and comprises an upper filter component, a base, a liquid suction component, a urea quality sensor, a urea liquid level temperature measuring component and a urea heating component. Wherein the upper filtering assembly comprises a filtering shell, a horizontal filter, a filtering front cover plate and a cooling water nozzle, an outer cavity and an inner cavity are formed in the filtering shell, and the filter is arranged between the outer cavity and the inner cavity. The liquid suction assembly comprises a urea pipe and a coarse filtering piece, and the coarse filtering piece and the filter form a double-filtering structure. The front filter cover plate is provided with a urea outlet, the cooling water nozzle is provided with a water inlet through hole and a water outlet through hole and connected with a channel in the filter shell to form a cooling circulation path, and in addition, an air containing space is reserved in the upper half portion of the filter. According to the utility model, the filter screen replacement process is simplified through the upper filter, the cooling water pipe or the urea quality sensor does not need to be disassembled, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the urea quality sensor structure of automobile aftertreatment system's urea technical field, especially in upper filter's urea quality sensor structure. BACKGROUND

[0002] In the actual use process of the vehicle, the operation of filling urea and maintaining the urea tank will inevitably cause impurities to enter the urea tank. If these impurities enter the urea pump and urea nozzle through the urea pipeline, the SCR (Selective Catalytic Reduction) aftertreatment system will not work normally, resulting in vehicle emission exceeding the standard and failing to meet the regulatory requirements.

[0003] To solve this problem, the existing products on the market usually arrange a filter at the bottom end of the sensor suction tube to prevent impurities in the urea tank from entering the urea pipeline. However, this design has the problem of rising filter resistance. As the use time increases, impurities will gradually adhere to the filter, causing the filter resistance to rise and the permeability to drop significantly. In addition, when replacing the filter at the bottom end of the suction tube, the heating and cooling water pipe and the urea pipe need to be disassembled first, and then the entire sensor needs to be removed from the urea tank for replacement. Due to the space limitation of the whole vehicle layout, the disassembly operation of the cooling water pipe is very inconvenient, and the cooling water in the cooling water pipe will inevitably spill everywhere when disassembled.

[0004] These problems further exacerbate the complexity and cost of maintenance work. Due to the space limitation of the whole vehicle layout, the disassembly of the sensor becomes extremely inconvenient, increasing the time and labor cost of maintenance. Specifically, the current filter arrangement not only makes the filter replacement complex, requiring the disassembly of multiple components to complete the replacement, but also has the risk of cooling water leakage, affecting work efficiency and possibly causing environmental pollution. SUMMARY

[0005] The utility model aims at overcoming the deficiencies in the prior art and provides a urea quality sensor structure with an upper filter. The filter is arranged at the upper end of the urea quality sensor, so that when replacing the filter, the cooling water pipe does not need to be disassembled, and the entire urea quality sensor does not need to be removed from the urea tank, greatly improving the maintenance efficiency and reducing the maintenance cost. In addition, by arranging the filter horizontally, it is ensured that there is always some air in the upper half of the filter, avoiding damage to the filter housing due to the volume expansion of frozen urea in winter.

[0006] To achieve the above-mentioned purpose, the utility model provides a urea quality sensor structure with an upper filter, comprising: an upper filter assembly, a base, a liquid suction assembly, a urea quality sensor, a urea liquid level temperature measurement assembly, and a urea heating assembly;

[0007] The upper end surface of the base is connected with an upper filter assembly through a flange, the lower end surface of the base is fixed with a liquid suction assembly extending downward, a urea quality sensor, a urea liquid level temperature measuring assembly and a urea heating assembly; function partition is realized through a modular structure, the base as a core connecting component simplifies assembly process, and meanwhile independent operation space is provided for maintenance of each assembly;

[0008] The upper filter assembly comprises:

[0009] A filter housing is internally provided with a cavity, an integrated cavity structure enhances sealing performance, and a stable working environment is provided for the filter system;

[0010] A filter is horizontally arranged in the cavity of the filter housing, horizontal arrangement ensures that an air buffer layer is formed in the upper half of the cavity, and expansion pressure of urea caused by freezing is effectively relieved;

[0011] A filter front cover plate is arranged on the end surface of the filter housing, and the detachable end cover facilitates filter replacement operation; and

[0012] Two cooling water nozzles are arranged on the two sides of the filter housing respectively, and the symmetrical cooling water nozzles serve as waterway interfaces to optimize the cooling liquid circulation path, improve heat exchange efficiency, thaw frozen ice through heat transfer, and further ensure normal operation of the SCR aftertreatment system.

[0013] Beneficial effects: the filter is arranged at an upper position of the urea quality sensor, so that the cooling water pipe and the urea pipe do not need to be disassembled when the filter screen is replaced, and the entire urea quality sensor does not need to be disassembled from the urea tank, which greatly simplifies the maintenance process and reduces the time and cost of maintenance. Meanwhile, the filter is horizontally arranged, so that part of air is always left in the upper half of the filter. In this way, in winter, urea solution freezing can be avoided to damage the shell due to volume expansion. In addition, the design of the cooling water nozzle can thaw frozen ice through heat transfer, and further ensure normal operation of the SCR aftertreatment system.

[0014] Further, the cavity of the filter housing comprises an outer cavity and an inner cavity, and the filter is arranged between the outer cavity and the inner cavity.

[0015] Beneficial effects: the double-cavity structure forms a graded filter channel to realize progressive purification of urea solution.

[0016] Further, the liquid suction assembly comprises a urea pipe and a coarse filter element, the coarse filter element is arranged at the bottom end of the liquid suction assembly, one end of the urea pipe is in communication with the coarse filter element, and the other end is in communication with the outer cavity of the filter housing.

[0017] Beneficial effects: the bottom coarse filtration and the filtration at the top form a cooperative filtration system, and the risk of blockage is greatly reduced.

[0018] Further, the filter front cover plate is provided with a urea outlet.

[0019] Beneficial effect: directional flow guide, ensure accurate delivery of urea after filtration.

[0020] Further, each cooling water nozzle is provided with an intermediate through hole, which includes a water inlet through hole and a water outlet through hole.

[0021] Beneficial effect: double-channel integrated interface simplifies pipeline connection and avoids confusion of cooling liquid delivery direction.

[0022] Further, the filter shell is provided with a water inlet channel, a transition channel and a water outlet channel, the water inlet channel communicates with the water inlet through hole, and the water outlet channel communicates with the water outlet through hole.

[0023] Beneficial effect: the cooling water nozzle of the utility model is arranged on both sides of the filter shell, one on each side, and has a water inlet through hole and a water outlet through hole respectively, cooling water is connected with the heating pipe through the water inlet channel, the transition channel and the water outlet channel, forming an effective cooling circulation path, ensuring temperature control of the urea solution, such flow channel layout increases the heat conduction area and improves the thawing efficiency in low temperature environment.

[0024] Further, the urea heating assembly comprises a heating pipe, the heating pipe is provided with a first joint channel and a second joint channel, the first joint channel communicates with the water outlet channel of the filter shell, and the second joint channel communicates with the water inlet channel of the filter shell.

[0025] Beneficial effect: the closed-loop heat circulation system realizes waste heat recycling and reduces energy consumption.

[0026] Further, the upper filter assembly further comprises a pressure sensor, and the pressure sensor is arranged on the filter shell.

[0027] Beneficial effect: the real-time pressure monitoring function provides a safety warning mechanism for the filter system.

[0028] Further, the filter has an air containing space in the upper half of the cavity of the filter shell.

[0029] Beneficial effect: the air containing space allows gas and liquid to coexist, increases the frost heaving resistance of the SCR aftertreatment system, and avoids damage caused by icing in winter.

[0030] Further, the rough filter arranged at the bottom end of the liquid suction assembly and the filter form a double filtration structure.

[0031] Beneficial effects: The urea solution is preliminarily filtered through the coarse filter in the liquid suction assembly, then enters the outer cavity of the filter through the urea pipe, and finally is discharged through the urea outlet after being filtered, the two-stage filtering mode not only improves the cleanliness of the urea solution, but also guarantees the efficient working of the subsequent system, ensures the high filtering effect, reduces the possibility of impurities entering the SCR aftertreatment system, and thus improves the stability and reliability of the system.

[0032] In summary, the urea quality sensor structure with the filter arranged above provided by the present application significantly improves the performance and maintenance convenience of the urea quality sensor by optimizing the layout of the filter, improving the cooling water circulation path, and adopting double filtering, and effectively solves the problems of inconvenient maintenance and being easily affected by the environment in the prior art. These improvement measures not only improve the stability and efficiency of the SCR aftertreatment system, but also reduce the maintenance cost, and have high practical value and market application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structure schematic diagram of the urea quality sensor with the filter arranged above provided by an embodiment of the present application;

[0034] Figure 2 is an exploded view of the filter arranged above in the present application;

[0035] Figure 3 is a cross-sectional view of the urea quality sensor structure with the filter arranged above of the present application;

[0036] Figure 4 is an exploded view of the urea quality sensor with the filter arranged above in the present application;

[0037] Label explanation: 1, filter arranged above; 1.1, pressure sensor; 1.2, front cover plate before filtering; 1.2.1, urea outlet; 1.5, filter; 1.6, cooling water nozzle; 1.6.1, water inlet through hole; 1.6.2, water outlet through hole; 1.7, filter shell; 1.7.1, water inlet channel; 1.7.2, transition channel; 1.7.3, water outlet channel; 1.7.4, outer cavity; 1.7.5, inner cavity; 2, base; 3, liquid suction assembly; 3.1, urea pipe; 3.2, coarse filter; 4, urea quality sensor; 5, urea liquid level temperature measurement assembly; 6, urea heating assembly; 6.1, first and second joint channels; 6.2, second joint channel; 6.3, heating pipe. DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0039] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "upper", "lower", "horizontal" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "upper", "lower", "horizontal" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] As shown in Figure 1 and Figure 4 The utility model provides a kind of urea quality sensor structure of overlying filter, comprising: overlying filter assembly 1, pedestal 2, liquid suction component 3, urea quality sensor 4, urea liquid level temperature measurement component 5 and urea heating component 6;

[0042] The upper end surface of pedestal 2 is connected with overlying filter assembly 1 by flange, and the lower end surface of pedestal 2 is fixed with downwardly extending liquid suction component 3, urea quality sensor 4, urea liquid level temperature measurement component 5 and urea heating component 6;

[0043] As shown in Figure 2 Overlying filter assembly 1 includes:

[0044] Filter housing 1.7, cavity is arranged in filter housing 1.7;

[0045] Filter 1.5 is horizontally arranged in the cavity of filter housing 1.7;

[0046] Filter front cover plate 1.2 is arranged on the end surface of filter housing 1.7;And,

[0047] Two cooling water nozzles 1.6 are arranged on the two sides of filter housing 1.7 respectively.

[0048] Compared with the prior art, the utility model discloses the beneficial effects reached have

[0049] The utility model discloses a filter 1.5 is set in the upper position of urea quality sensor 4, makes when replacing the filter screen of filter 1.5 not need to disassemble cooling water pipe and urea pipe, also need not to take out the whole urea quality sensor 4 from the urea tank of whole car structure, this greatly simplifies the maintenance process, reduces the time and cost of maintenance and repair.

[0050] Meanwhile, the filter 1.5 of the utility model is horizontally arranged, so that the upper half always has some air. In this way, when the urea solution freezes in winter, the damage to the shell caused by volume expansion can be avoided. In addition, the design of the cooling water nozzle can thaw the ice through heat transfer, further ensuring the normal operation of the SCR aftertreatment system.

[0051] Further, the cavity of the filter shell 1.7 includes an outer cavity 1.7.4 and an inner cavity 1.7.5, and the filter 1.5 is arranged between the outer cavity 1.7.4 and the inner cavity 1.7.5.

[0052] Further, the liquid suction assembly 3 includes a urea pipe 3.1 and a coarse filter 3.2, the coarse filter 3.2 is arranged at the bottom end of the liquid suction assembly 3, one end of the urea pipe 3.1 communicates with the coarse filter 3.2, and the other end communicates with the outer cavity 1.7.4 of the filter shell 1.7. Optionally, the urea pipe 3.1 is a corrugated hose, and the top end of the urea pipe 3.1 is connected to the bottom interface of the outer cavity 1.7.4 through a quick-release clamp.

[0053] Specifically, the urea outlet 1.2.1 is arranged on the filter front cover plate 1.2.

[0054] Specifically, each cooling water nozzle 1.6 is provided with an intermediate through hole, and the intermediate through hole includes a water inlet through hole 1.6.1 and a water outlet through hole 1.6.2.

[0055] Further, as shown in Figure 2 and Figure 3 The filter shell 1.7 is provided with a water inlet channel 1.7.1, a transition channel 1.7.2, and a water outlet channel 1.7.3, the water inlet channel 1.7.1 communicates with the water inlet through hole 1.6.1, and the water outlet channel 1.7.3 communicates with the water outlet through hole 1.6.2.

[0056] The cooling water nozzle of the utility model is arranged on both sides of the filter shell, one on each side, and has a water inlet through hole and a water outlet through hole respectively. The cooling water is connected to the heating pipe through the water inlet channel, the transition channel, and the water outlet channel, forming an effective cooling circulation path, which ensures the temperature control of the urea solution. Such a flow channel layout increases the heat conduction area and improves the thawing efficiency in a low-temperature environment.

[0057] Specifically, the urea heating assembly 6 comprises a heating pipe 6.3 provided with a first joint channel 6.1 and a second joint channel 6.2, the first joint channel 6.1 being communicated with the water outlet channel 1.7.3 of the filter shell 1.7, and the second joint channel 6.2 being communicated with the water inlet channel 1.7.1 of the filter shell 1.7.

[0058] Further, the upper filter assembly 1 further comprises a pressure sensor 1.1 arranged on the filter shell 1.7.

[0059] Specifically, the filter 1.5 has an air containing space in the upper half of the cavity of the filter shell 1.7.

[0060] Further, the coarse filter 3.2 arranged at the bottom end of the liquid suction assembly 3 and the filter 1.5 constitute a double filtration structure. The urea solution is preliminarily filtered by the coarse filter in the liquid suction assembly, then enters the outer cavity of the filter through the urea pipe, is further filtered in the inner cavity, and finally is discharged through the urea outlet. This two-stage filtration mode not only improves the cleanliness of the urea solution, but also ensures the efficient working of the subsequent system, ensures the high filtration effect, reduces the possibility of impurities entering the SCR aftertreatment system, and thus improves the stability and reliability of the system.

[0061] In actual use, the urea quality sensor structure of the upper filter is installed on the automobile urea tank, and is used for filtering, heating and quality monitoring of the urea solution. The following is the specific implementation process:

[0062] The urea solution is sucked from the urea tank through the urea pipe 3.1 of the liquid suction assembly 3. At the bottom end of the liquid suction assembly 3, the urea solution first passes through the coarse filter 3.2, which has a filter hole diameter of 1-3 mm, to preliminarily filter out large-particle impurities and prevent them from entering the subsequent system. The urea solution after the coarse filtration enters the outer cavity 1.7.4 of the filter shell 1.7 of the upper filter assembly 1 through the urea pipe 3.1. In the filter shell 1.7, the urea solution passes through the horizontally arranged filter 1.5 to be further filtered to remove small impurities. The filtered urea solution enters the inner cavity 1.7.5 and is discharged through the urea outlet 1.2.1 on the filter front cover plate 1.2 for use by the subsequent system.

[0063] The engine cooling water enters the water inlet passage 1.7.1 of the filter housing 1.7 through the water inlet through hole 1.6.1 of the cooling water nozzle 1.6. The cooling water passes through the transition passage 1.7.2 and the water outlet passage 1.7.3 in sequence, and exchanges heat with the urea solution through the heating pipe 6.3 of the urea heating assembly 6. After the cooling water absorbs the heat of the urea solution through the heating pipe 6.3, the cooling water flows out from the water outlet through hole 1.6.2 and returns to the engine cooling system. This process not only provides a heating function for the urea solution to prevent it from freezing in a low-temperature environment, but also maintains the appropriate temperature of the urea solution through heat exchange.

[0064] The pressure sensor 1.1 in the over-filtering assembly 1 monitors the pressure in the filter housing 1.7 in real time, ensuring that the system operates within a safe pressure range. When the pressure is abnormal, the system can issue an alarm or take appropriate measures in time to ensure the normal operation of the entire urea aftertreatment system.

[0065] When the filter 1.5 needs to be replaced, only the over-filtering assembly 1 needs to be disassembled, without the need to disassemble the cooling water pipe or the entire urea quality sensor structure. This design greatly simplifies the maintenance process and reduces maintenance costs and time.

[0066] Through the above embodiment, the urea quality sensor structure of the over-filtering assembly can efficiently complete the filtering, heating and quality monitoring tasks of the urea solution, while improving the reliability and maintenance convenience of the system.

[0067] The above only describes preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A filter-over-urea quality sensor structure, characterized by, The application relates to a filter assembly for a urea tank. The upper end surface of the base (2) is connected with the upper filter assembly (1) through a flange, and the lower end surface of the base (2) is fixed with a liquid suction assembly (3) extending downward, a urea quality sensor (4), a urea liquid level temperature measuring assembly (5) and a urea heating assembly (6). The upper filter assembly (1) comprises: A filter housing (1.7) is internally provided with a cavity; A filter (1.5) is horizontally arranged in the cavity of the filter housing (1.7); A filter front cover plate (1.2) is arranged on the end surface of the filter housing (1.7); and Two cooling water nozzles (1.6) are respectively arranged on the two sides of the filter housing (1.7). The cavity of the filter housing (1.7) comprises an outer cavity (1.7.4) and an inner cavity (1.7.5), and the filter (1.5) is arranged between the outer cavity (1.7.4) and the inner cavity (1.7.5).

2. The filter-over-urea quality sensor structure of claim 1, wherein, The liquid suction assembly (3) comprises a urea pipe (3.1) and a coarse filter (3.2), the coarse filter (3.2) is arranged at the bottom end of the liquid suction assembly (3), one end of the urea pipe (3.1) is communicated with the coarse filter (3.2), and the other end is communicated with the outer cavity (1.7.4) of the filter housing (1.7).

3. The filter-over-urea quality sensor structure of claim 2, wherein, The filter front cover plate (1.2) is provided with a urea outlet (1.2.1).

4. The filter-on-top urea quality sensor structure of claim 1, wherein, Each cooling water nozzle (1.6) is provided with an intermediate through hole, and the intermediate through hole comprises a water inlet through hole (1.6.1) and a water outlet through hole (1.6.2).

5. The filter-on-top urea quality sensor structure of claim 1, wherein, The filter housing (1.7) is provided with a water inlet channel (1.7.1), a transition channel (1.7.2) and a water outlet channel (1.7.3), the water inlet channel (1.7.1) is communicated with the water inlet through hole (1.6.1), and the water outlet channel (1.7.3) is communicated with the water outlet through hole (1.6.2).

6. The filter-over-urea quality sensor structure of claim 5, wherein, The urea heating assembly (6) comprises a heating pipe (6.3), the heating pipe (6.3) is provided with a first joint channel (6.1) and a second joint channel (6.2), the first joint channel (6.1) is communicated with the water outlet channel (1.7.3) of the filter housing (1.7), and the second joint channel (6.2) is communicated with the water inlet channel (1.7.1) of the filter housing (1.7).

7. The filter-over-urea quality sensor structure of claim 6, wherein, The upper filter assembly (1) further comprises a pressure sensor (1.1) arranged on the filter housing (1.7).

8. The filter-on-top urea quality sensor structure of claim 1, wherein, The upper half of the filter (1.5) in the cavity of the filter housing (1.7) has an air containing space.

9. The filter-on-top urea quality sensor structure according to any one of claims 1 - 8, characterized in that, The coarse filter (3.2) arranged at the bottom end of the liquid suction assembly (3) and the filter (1.5) constitute a double-filter structure.

10. The filter-on-top urea quality sensor structure according to any one of claims 1 - 8, characterized in that, ​

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