Urea box sensor, urea box, urea system and vehicle

Abstract

The utility model discloses a urea box sensor, a urea box, a urea system and a vehicle. The urea box sensor comprises a head, a concentration probe, a heating water pipe, a liquid suction pipe, a liquid suction three-way connector and a liquid suction filter screen. The head part is connected with the concentration probe through a connecting pipe, and the heating water pipe is spirally fixed on the outer side of the connecting pipe in a surrounding manner; a liquid suction cavity is formed in the connecting pipe, a liquid suction three-way connector is arranged on the liquid suction pipe, the first end of the liquid suction three-way connector is connected with the head through the first end of the liquid suction pipe, the second end of the liquid suction three-way connector is connected with the liquid suction filter screen through the second end of the liquid suction pipe, and the third end of the liquid suction three-way connector is connected to the interior of the liquid suction cavity. And the problem of product type spectrum redundancy corresponding to different lengths caused by rigid hardware can be solved to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of urea supply systems, in particular to a urea box sensor, a urea box, a urea system and a vehicle. Background Art

[0002] In order to reduce the pollution of automobile exhaust to the atmospheric environment, it is usually necessary to spray urea aqueous solution into automobile exhaust in the art. The urea aqueous solution reacts with nitrogen oxides in automobile exhaust to generate pollution-free nitrogen and water, which are then discharged into the atmospheric environment, which can effectively reduce pollution. In the field of vehicles, the urea tank usually includes a urea tank body for storing urea aqueous solution and a urea tank sensor assembly contained in the urea tank body. The urea tank sensor assembly can be integrated with a heating pipe, a urea pipe, a liquid level sensor, a temperature sensor and a concentration sensor. There are also many kinds of urea tank sensor assemblies on the market, but the actual use effects are indeed uneven.

[0003] The inventor found in the research that the urea tank sensor in the prior art is usually provided with a urea tank sensor float and a guide shaft. For example, in the patent application No. 202320517731.8 "Urea tank liquid level sensor float, urea system, exhaust system and vehicle", it is disclosed that the urea tank liquid level sensor float includes a float body, and the float body includes a first float half body and a second float half body, and the first float half body and the second float half body are both provided with a groove extending along the axial direction, and the side of the first float half body provided with the groove is docked with the side of the second float half body provided with the groove, and the groove of the first float half body and the groove of the second float half body form a hole structure, and the hole structure is used to accommodate the guide shaft.

[0004] For example, patent application No. 202320507331.9 "Urea tank liquid level sensor float, urea tank, urea system and vehicle" discloses a float body and a magnetic device, a guide hole for matching the guide shaft is provided on the float body, and the float body includes an inner wall facing the guide hole and an outer wall arranged opposite to the inner wall. For another example, patent application No. 201120412007.6 "Automobile urea tank sensor assembly" discloses a fixing seat fixedly connected to the urea tank, a urea solution absorbing pipe, a urea solution reflux pipe, a sensor electronic tube and a heating device, and the heating device is arranged in the water inlet interface, the water outlet interface and the urea tank.

[0005] In summary, in the prior art, the magnetic float of the urea tank sensor is immersed in urea and floats on the liquid surface by buoyancy, which attracts the Hall switch on the reed switch in the guide shaft, and then outputs the electrical parameters as physical parameters of the liquid level through analog-to-digital conversion. This method uses physical position limitation, and the reed switch in the guide shaft needs to match the maximum liquid level of the urea tank for involvement. In addition, due to different volume urea tanks and different heights corresponding to different reed switch lengths, the volume and height need to be matched separately, and the modularization capability is limited. In the prior art, rigid hardware such as reed switches lead to redundancy in the product model spectrum corresponding to different lengths. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a urea tank sensor, a urea tank, a urea system and a vehicle. Through the designed flexible liquid suction tube, flexible liquid suction three-way joint and liquid suction cavity, the redundancy problem of corresponding product models with different lengths caused by rigid hardware can be overcome to a great extent.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] In a first aspect, the utility model provides a urea tank sensor, comprising:

[0009] Head, concentration probe, heating water pipe, liquid suction pipe, liquid suction three-way joint and liquid suction filter;

[0010] The head and the concentration probe are connected via a connecting pipe, and the heating water pipe is spirally fixed on the outside of the connecting pipe;

[0011] A liquid suction cavity is arranged inside the connecting tube, a liquid suction three-way joint is arranged on the liquid suction tube, a first end of the liquid suction three-way joint is connected to the head through the first end of the liquid suction tube, a second end of the liquid suction three-way joint is connected to the liquid suction filter through the second end of the liquid suction tube, and a third end of the liquid suction three-way joint is connected to the inside of the liquid suction cavity.

[0012] As a further technical solution, the head includes a coolant inlet joint, a coolant return joint, a urea inlet joint, a urea return joint and a signal processing board, and a sealing upper cover is installed on the top of the head.

[0013] As a further technical solution, the first end of the liquid suction tube is connected to the urea liquid inlet connector in the head for urea supply.

[0014] As a further technical solution, the liquid absorption filter is configured as a porous circular structure.

[0015] As a further technical solution, a weighted ball is arranged in the liquid absorption filter, so that the liquid absorption filter is arranged at the bottom of the urea tank.

[0016] As a further technical solution, the liquid suction tube and the liquid suction three-way joint are both configured as flexible structures.

[0017] As a further technical solution, the connecting pipe is hollow inside.

[0018] In a second aspect, the utility model provides a urea tank, comprising: a urea tank body;

[0019] A urea tank sensor as described in any one of the first aspects; the urea tank sensor is arranged in the urea tank body.

[0020] In a third aspect, the utility model provides a urea system, comprising:

[0021] The urea tank as provided in the second aspect;

[0022] A urea supply unit is connected to the urea tank through a pipeline.

[0023] In a fourth aspect, the utility model provides a vehicle, comprising:

[0024] engine;

[0025] An exhaust system is provided with a catalyst, and the exhaust system is connected to the engine to discharge the exhaust gas generated by the engine.

[0026] As for the urea system provided in the third aspect, the urea system is connected to the catalyst to supply urea liquid to the catalyst.

[0027] One or more technical solutions of the utility model have the following beneficial effects:

[0028] (1) The urea tank sensor and urea tank designed by the utility model through the above technical solution can greatly overcome the redundancy problem of corresponding product models with different lengths caused by rigid hardware.

[0029] (2) The flexible liquid suction tube and flexible liquid suction three-way joint designed in the urea tank sensor provided by the utility model can be applied to urea tanks of various volumes and lengths, without the need for volume matching and height matching, thereby enhancing modularity.

[0030] (3) The utility model can be used normally even in winter or in extremely cold areas. Urea can be thawed by heating the water pipe to achieve short-term urea supply. Even when the urea is not frozen or the urea liquid level is low, the liquid suction filter disposed at the bottom of the urea tank can achieve continuous urea supply, thereby avoiding engine torque limitation caused by low liquid level to a great extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0032] Figure 1 This is a schematic diagram of the structure of the urea sensor provided by the utility model;

[0033] Among them: 1 is the head; 2 is the concentration probe; 3 is the connecting pipe; 4 is the heating water pipe; 5 is the liquid suction pipe; 6 is the liquid suction three-way joint; 7 is the liquid suction filter; 8 is the counterweight ball; 9 is the liquid suction chamber. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Explanation of relevant terms:

[0036] Urea tank sensor: installed on the urea tank, used for urea supply, urea thawing, urea liquid level and concentration display, reminding the driver to add qualified urea to avoid engine torque limitation due to low liquid level.

[0037] Urea tank sensor float: It is one of the components of the urea tank sensor. Its working principle is: it floats on the surface of the urea liquid by using the buoyancy principle, and is used in conjunction with the reed switch and Hall switch inside the guide shaft of the urea tank sensor to convert the liquid level signal inside the urea tank into an electrical signal, which is then output as liquid level information.

[0038] Guide shaft: It is one of the parts of the urea tank sensor. It has electrical components such as reed switches and Hall switches inside and is generally made of stainless steel.

[0039] Embodiment 1

[0040] As introduced in the background technology, the urea tank sensors in the existing technology all use rigid hardware such as reed switches, which leads to the problem of redundancy of product models corresponding to different lengths. In order to solve the technical problems existing in the existing technology, such as Figure 1 As shown, in this embodiment, a urea tank sensor is provided, including:

[0041] A head 1, a concentration probe 2, a heating water pipe 4, a liquid suction pipe 5, a liquid suction three-way joint 6 and a liquid suction filter 7, wherein the head 1 and the concentration probe 2 are connected via a connecting pipe 3, and the heating water pipe 4 is fixed on the outer wall side of the connecting pipe 3. Specifically in this embodiment, the heating water pipe 4 is fixed on the outer wall side of the connecting pipe 3 in a spiral winding manner.

[0042] A liquid suction chamber 9 is provided inside the connecting tube 3. The liquid suction chamber is provided in the hollow connecting tube. Since the connecting tube is located inside the heating water pipe, the heating and thawing speed is the fastest and the liquid is first melted into liquid state and can be sucked for liquid supply. When urea is frozen in winter or cold areas, the urea nearby can be thawed by the heating water pipe to realize short-term urea supply.

[0043] A liquid suction three-way joint 6 is provided on the liquid suction pipe 5, and a first end of the liquid suction three-way joint 6 is connected to the head 1 through the first end of the liquid suction pipe 5, and is used to supply urea liquid to the head; a second end of the liquid suction three-way joint 6 is connected to the liquid suction filter 7 through the second end of the liquid suction pipe 5, and is used to absorb the urea liquid at the bottom of the urea tank; a third end of the liquid suction three-way joint 6 is connected to the inside of the liquid suction cavity 9, and is used to absorb the urea liquid inside the liquid suction cavity 9.

[0044] The liquid suction tube 5 and the liquid suction three-way joint 6 are both configured as flexible structures, which can adapt to urea tanks of different heights and volumes to complete the liquid suction action without matching the volume and height, thereby enhancing the modular capability and overcoming the redundancy problem of the corresponding product spectrum of different lengths caused by rigid hardware to a great extent.

[0045] In addition to the above structures, the liquid suction pipe 5 and the liquid suction three-way joint 6 can also be selected from the following structures:

[0046] The liquid suction pipe 5 includes a first liquid suction pipe and a second liquid suction pipe. The first end of the liquid suction three-way joint 6 is connected to the first end of the first liquid suction pipe, and the second end of the first liquid suction pipe is connected to the head 1, which is used to supply urea liquid to the head; the second end of the liquid suction three-way joint 6 is connected to the first end of the second liquid suction pipe, and the second end of the second liquid suction pipe is connected to the liquid suction filter 7, which is used to absorb the urea liquid at the bottom of the urea tank; the third end of the liquid suction three-way joint 6 is still connected to the inside of the liquid suction chamber 9, which is used to absorb the urea liquid inside the liquid suction chamber 9. In the low-temperature freezing state, urea in the liquid suction chamber 9 can be firstly absorbed to realize short-term liquid supply.

[0047] In this embodiment, the head 1 includes a coolant inlet connector, a coolant return connector, a urea inlet connector, a urea return connector and a signal processing board, and a sealed upper cover is installed on the top of the head 1. The layout of the various parts and the functional interface of the urea tank sensor head can also be arranged with the same or similar connection structure as the current prior art.

[0048] In this embodiment, the first end of the suction pipe is connected to the urea inlet connector in the head 1 for urea supply. In addition, optionally, the second end of the first suction pipe is connected to the urea inlet connector in the head 1 for urea supply.

[0049] In this embodiment, the liquid suction filter 7 is configured as a porous circular structure, and a counterweight ball 8 is arranged inside the liquid suction filter 7. Since the counterweight ball 8 has a large weight, the liquid suction filter 7 is arranged at the bottom of the urea tank. When the urea is not frozen or the urea liquid level is low, the urea suction pipe cannot suck urea from the suction cavity. By using the liquid suction filter 7 configured at the bottom of the urea tank in conjunction with the flexible suction pipe and the flexible suction three-way joint, the urea liquid at the bottom of the urea tank can be quickly and simply sucked, thereby realizing continuous supply of urea liquid and avoiding engine torque limitation caused by low liquid level to a great extent.

[0050] Embodiment 2

[0051] Based on the first embodiment, this embodiment further provides a urea tank, including: a urea tank body and the urea tank sensor provided in the first embodiment; specifically, the urea tank sensor is arranged inside the urea tank body.

[0052] Embodiment 3

[0053] Based on the second embodiment, this embodiment further provides a urea system, including the urea tank and the urea supply unit provided in the second embodiment. Specifically, the urea supply unit is connected to the urea tank provided in the second embodiment through a pipeline.

[0054] Embodiment 4

[0055] On the basis of the third embodiment, this embodiment further provides a vehicle, including an engine, an exhaust system and the urea system provided in the third embodiment, wherein a catalyst is arranged in the exhaust system, the exhaust system is connected to the engine for discharging the exhaust gas generated by the engine, and the urea system is connected to the catalyst for supplying urea liquid to the catalyst.

[0056] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A urea tank sensor, characterized in that: include: Head, concentration probe, heating water pipe, liquid suction pipe, liquid suction three-way joint and liquid suction filter; The head and the concentration probe are connected via a connecting pipe, and the heating water pipe is spirally fixed on the outside of the connecting pipe; A liquid suction cavity is arranged inside the connecting tube, a liquid suction three-way joint is arranged on the liquid suction tube, a first end of the liquid suction three-way joint is connected to the head through the first end of the liquid suction tube, a second end of the liquid suction three-way joint is connected to the liquid suction filter through the second end of the liquid suction tube, and a third end of the liquid suction three-way joint is connected to the inside of the liquid suction cavity.

2. The urea tank sensor according to claim 1, characterized in that: The head includes a coolant inlet joint, a coolant return joint, a urea inlet joint, a urea return joint and a signal processing board, and a sealing upper cover is installed on the top of the head.

3. The urea tank sensor according to claim 2, characterized in that: The first end of the liquid suction pipe is connected to the urea liquid inlet joint in the head for supplying urea.

4. The urea tank sensor according to claim 1, characterized in that: The liquid absorption filter screen is arranged as a hole-shaped circular structure.

5. The urea tank sensor according to claim 4, characterized in that: A counterweight ball is arranged in the liquid absorption filter screen, so that the liquid absorption filter screen is arranged at the bottom of the urea tank.

6. The urea tank sensor according to claim 1, characterized in that: The liquid suction tube and the liquid suction three-way joint are both configured as flexible structures.

7. The urea tank sensor according to claim 1, characterized in that: The connecting pipe is hollow inside.

8. A urea tank, characterized in that: include: Urea tank; The urea tank sensor according to any one of claims 1 to 7; the urea tank sensor is arranged in the urea tank body.

9. A urea system, characterized in that: include: The urea tank as claimed in claim 8; A urea supply unit is connected to the urea tank through a pipeline.

10. A vehicle, characterized in that: include: engine; An exhaust system, wherein a catalyst is disposed in the exhaust system and the exhaust system is connected to the engine to discharge the exhaust gas generated by the engine; The urea system according to claim 9, wherein the urea system is connected to the catalyst to supply urea liquid to the catalyst.

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