Urea box

Abstract

A plurality of liquid level sensors are arranged at the bottom of the urea box, each liquid level sensor comprises a suspension device, a connecting device and a tension sensor, one end of each connecting device is connected with the corresponding suspension device, the other end of each connecting device is connected with the corresponding tension sensor, and the tension sensors are fixed at the bottom of the urea box. The suspension device is suspended on the liquid level of urea; according to the urea box provided by the utility model, the liquid level detection function is separated from the urea box sensor, and the plurality of liquid level sensors are arranged at the bottom of the urea box, so that the problem that the liquid level measurement is inaccurate due to the fact that the liquid level sensor is arranged on the urea box sensor in the prior art and the urea liquid level shakes is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea tank liquid level measuring devices, and in particular relates to a urea tank. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In order to protect the air quality of the environment, it is necessary to control automobile exhaust emissions. Simple in-engine purification technology is difficult to meet the emission requirements, and it must rely on external post-processing technology for auxiliary purification. In terms of external technology treatment of automobile exhaust emissions, the selective catalytic reduction system (also known as the SCR system) technology is currently mainly used to control the nitrogen oxide emissions of diesel engines. The selective catalytic reduction system needs to extract urea solution from the urea tank. The urea tank is equipped with a liquid level sensor, which can monitor the liquid level of the urea solution in the urea tank.

[0004] The existing urea tank usually monitors the liquid level through the urea tank sensor. The urea tank sensor is installed on the urea tank and is 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. For example, Chinese utility model patent CN216588783U discloses a urea tank sensor assembly, which fixes the liquid level sensor to the top and bottom of the urea tank sensor to monitor the urea liquid level in the urea tank. Due to the existing urea tank liquid level sensor, The complex structure and large size will occupy more space in the urea tank. Therefore, the liquid level sensor is usually integrated on the urea tank sensor to realize the liquid level detection function. However, in this structure, the urea liquid level shakes during vehicle driving, resulting in the liquid level sensor on the urea tank sensor being unable to accurately indicate the urea liquid level, resulting in inaccurate liquid level measurement. In addition, during the urea supply process, due to the different volumes of the urea tank, it is necessary to set suction tubes of different heights on the urea sensor to absorb urea, resulting in the inability to realize modularization of the urea tank sensor. Utility Model Content

[0005] The utility model aims to provide a urea tank, which can solve the problem that when a liquid level sensor is integrated on a urea tank sensor, urea liquid level shakes, resulting in inaccurate liquid level measurement.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] In a first aspect, an embodiment of the utility model provides a urea tank level sensor, comprising a suspension device, a connecting device and a tension sensor, wherein one end of the connecting device is connected to the suspension device, and the other end is connected to the tension sensor, the tension sensor is fixed to the bottom of the urea tank, and the suspension device is suspended above the urea liquid surface.

[0008] As a further technical solution, the tension sensor adopts an S-type tension sensor, one end of which is provided with a thread and fixed to the bottom of the urea tank through the thread, and the other end is provided with a universal pull ring, and the universal pull ring is connected to the connecting device.

[0009] As a further technical solution, the suspension device adopts a suspension ball or a suspension cylinder.

[0010] As a further technical solution, the connecting device adopts a spring, and the maximum elastic force generated by the spring due to the expansion and contraction amount is smaller than the buoyancy of the suspension device, so as to ensure that the suspension device is always suspended on the urea liquid surface.

[0011] As a further technical solution, the exterior of the tension sensor is sealed by a waterproof housing.

[0012] As a further technical solution, the data line of the tension sensor is connected to an analog-to-digital converter.

[0013] As a further technical solution, a plurality of urea tank liquid level sensors are evenly distributed at the bottom of the urea tank.

[0014] As a further technical solution, data lines of multiple urea tank level sensors are all connected to the electronic control unit.

[0015] As a further technical solution, a urea tank sensor is also provided on the urea tank. The urea tank sensor includes a liquid suction chamber and a liquid suction tube. The liquid suction chamber is connected to the liquid suction tube through a three-way joint. A heating water pipe is wound around the outside of the liquid suction chamber.

[0016] As a further technical solution, the liquid suction tube is made of a flexible material, and one end of the liquid suction tube is connected to a weighted ball and a liquid suction filter.

[0017] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0018] The urea tank provided by the utility model separates the liquid level detection function from the urea tank sensor, and a plurality of liquid level sensors are arranged at the bottom of the urea tank, thereby solving the problem that the existing liquid level sensor is arranged on the urea tank sensor, resulting in urea liquid level shaking and inaccurate liquid level measurement.

[0019] The utility model provides a liquid level sensor with a novel structure, comprising a suspension device, a connecting device and a tension sensor. The suspension device is suspended on the urea liquid surface by the buoyancy. At this time, the tension sensor is subjected to tension, and the tension is converted into the buoyancy of the suspension device through analog-to-digital conversion, and further converted into liquid level height information, which is transmitted to an electronic control unit for output. Compared with the existing liquid level sensor, the liquid level sensor has a simple structure, is easy to implement, and has a small size. Even if multiple liquid level sensors are provided, they will not occupy too much urea tank space and will not affect the urea storage capacity of the urea tank.

[0020] The urea tank provided by the utility model realizes short-time urea supply by thawing nearby urea through a heating water pipe, and is suitable for use in winter or cold areas when urea is frozen; when the urea is not frozen or the urea liquid level is low, and the urea suction pipe cannot suck urea from the suction cavity, urea suction can be realized by a weighted ball and a suction filter screen arranged at the bottom of the urea tank and connected by a flexible suction pipe, because the suction pipe is of flexible design and can be adapted to urea tanks of different heights and volumes to complete the suction action, and due to the existence of the weighted ball, the urea filter screen is arranged at the bottom of the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a structural schematic diagram of a urea tank liquid level sensor of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of a urea tank in Embodiment 1 of the present utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a urea tank in Embodiment 2 of the present utility model;

[0025] Figure 4 It is a structural schematic diagram of a urea tank in Example 3 of the utility model.

[0026] The schematic diagram is for illustrative purposes only;

[0027] Among them, 1. suspension device; 2. connecting device; 3. tension sensor; 4. urea tank; 5. urea tank level sensor; 6. urea tank sensor; 7. three-way connector; 8. heating water pipe; 9. liquid suction chamber; 10. concentration probe; 11. weighted ball and liquid suction filter; 12. liquid suction tube; 13. ultrasonic liquid level sensor. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary 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.

[0029] Example 1

[0030] In a typical implementation of the present invention, Figure 1 and Figure 2 As shown, a urea tank is provided, and a plurality of liquid level sensors are arranged at the bottom of the urea tank. The liquid level sensor comprises a suspension device 1, a connecting device 2 and a tension sensor 3. One end of the connecting device 2 is connected to the suspension device 1, and the other end is connected to the tension sensor 3. The tension sensor 3 is fixed at the bottom of the urea tank. The suspension device 1 is suspended on the urea liquid surface. The buoyancy of the suspension device 1 is used to pull the connecting device 2, so that the connecting device 2 transmits the force to the tension sensor 3. At this time, the tension sensor 3 is subjected to tension, and the tension is converted into the buoyancy of the suspension device 1 through analog-to-digital conversion, and further converted into liquid level information, which is transmitted to the electronic control unit for output, so as to realize the measurement of the urea liquid level.

[0031] In one implementation of this embodiment, the tension sensor 3 is an S-type tension sensor, one end of which is provided with a thread and fixed to the bottom of the urea tank by the thread, and the other end is provided with a universal pull ring, which is connected to the connecting device 2. In some other implementations, other types of tension sensors can also be used as long as they can cooperate with the suspension device to realize the tension test.

[0032] In this embodiment, the suspension device 2 is a suspension ball or a suspension cylinder, and the suspension device is always suspended on the liquid surface of urea in the urea tank.

[0033] In this embodiment, the connecting device 2 adopts a spring, the elastic force of the spring changes linearly with the expansion and contraction amount, and it is necessary to ensure that the maximum elastic force caused by the expansion and contraction amount of the spring is smaller than the buoyancy of the suspension device to ensure that the suspension device always floats on the liquid surface.

[0034] In this embodiment, the exterior of the tension sensor 3 is sealed by a waterproof housing to avoid affecting the internal structure of the tension sensor.

[0035] In this embodiment, the data line of the tension sensor 3 is connected to an analog-to-digital converter, and the tension measured by the tension sensor is converted into the buoyancy of the suspension device through analog-to-digital conversion, and further converted into liquid level information. The analog-to-digital converter uses existing products, which can realize the conversion of analog quantity into digital quantity. The specific correspondence between tension and liquid level needs to be calibrated according to the selected spring parameters, suspension ball size, etc., to form a form similar to a spectrum, and the liquid level height corresponding to the actual value of the spring tension at a certain liquid level is confirmed by checking the spectrum.

[0036] The working principle of the urea tank level sensor is as follows: the suspension device is suspended on the urea liquid surface due to the buoyancy. At this time, the tension sensor is subjected to tension, and the tension is converted into the buoyancy of the suspension device through analog-to-digital conversion, and further converted into liquid level height information, which is transmitted to the electronic control unit for output.

[0037] In this embodiment, a plurality of urea tank liquid level sensors 5 are evenly distributed at the bottom of the urea tank.

[0038] Furthermore, the data lines of the multiple urea tank level sensors 5 are all connected to the electronic control unit. By providing multiple urea tank level sensors, the ability to resist interference from liquid level fluctuations can be improved. The liquid level information needs to be calibrated and balanced with each other to ultimately output a reliable and effective actual urea level.

[0039] Furthermore, a urea tank sensor 6 is also provided on the urea tank 4. The urea tank sensor 6 adopts an existing structure and is used to realize functions such as urea supply, urea thawing and concentration display.

[0040] The urea tank provided in this embodiment can monitor the liquid levels at multiple positions in the urea tank by setting up multiple urea tank liquid level sensors, thereby improving the ability to resist interference from liquid level fluctuations, and finally outputting a reliable and effective actual urea liquid level by calibrating and balancing the liquid level information.

[0041] Example 2

[0042] Considering that during the urea supply process, due to the different volumes of the urea tank, it is necessary to set pipettes of different heights on the urea sensor to absorb urea, which makes it impossible to realize modularization of the urea tank sensor. Therefore, this embodiment improves the urea tank sensor in embodiment 1, such as Figure 3 As shown, the urea tank sensor 6 includes a liquid suction chamber 9 and a liquid suction tube 12. The liquid suction chamber is connected to the liquid suction tube through a three-way joint 7. A heating water pipe 8 is wound around the outside of the liquid suction chamber 9. A concentration probe 10 is also provided on the urea tank sensor to detect the urea concentration.

[0043] Furthermore, the liquid suction tube 12 is made of a flexible material, and one end of the liquid suction tube 12 is connected to a weighted ball and a liquid suction filter 11 .

[0044] The urea tank provided in the present embodiment realizes a short-time urea supply by thawing the nearby urea through the arranged heating water pipe, and is suitable for use in winter or cold areas when urea is frozen; when the urea is not frozen or the urea liquid level is low, and the urea suction pipe cannot suck urea from the suction chamber, urea suction can be achieved by the counterweight ball and the suction filter screen arranged at the bottom of the urea tank and connected by the flexible suction pipe. Because the suction pipe is of flexible design, it can be adapted to urea tanks of different heights and volumes to complete the suction action, and due to the existence of the counterweight ball, the urea filter is arranged at the bottom of the tank.

[0045] Example 3

[0046] The present embodiment provides a urea tank, which is different from the urea tank in Embodiment 2 in that the urea tank liquid level sensor adopts an ultrasonic liquid level sensor 13, and a plurality of ultrasonic liquid level sensors 13 are provided. The plurality of ultrasonic liquid level sensors 13 are evenly installed on the top of the urea tank 4, and ultrasonic waves are emitted to the liquid surface in the urea tank by a plurality of ultrasonic transmitters. The distance between the liquid surface and the top of the urea tank is calculated by the reflection situation, and then the urea liquid level information is obtained. At the same time, in order to eliminate the shaking of the liquid surface, a plurality of detectors are also required to be used for simultaneous testing and calibration.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can 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, characterized in that: A plurality of liquid level sensors are arranged at the bottom of the urea tank, and the liquid level sensors include a suspension device, a connecting device and a tension sensor. One end of the connecting device is connected to the suspension device, and the other end is connected to the tension sensor. The tension sensor is fixed at the bottom of the urea tank, and the suspension device is suspended above the urea liquid surface.

2. The urea tank according to claim 1, characterized in that: The tension sensor adopts an S-type tension sensor, one end of which is provided with a thread and fixed to the bottom of the urea tank through the thread, and the other end is provided with a universal pull ring, and the universal pull ring is connected to the connecting device.

3. The urea tank according to claim 1, characterized in that: The suspension device adopts a suspension ball or a suspension cylinder.

4. The urea tank according to claim 1, characterized in that: The connecting device adopts a spring, and the maximum elastic force generated by the spring due to the expansion and contraction amount is smaller than the buoyancy of the suspension device, so as to ensure that the suspension device is always suspended on the urea liquid surface.

5. The urea tank according to claim 1, characterized in that: The exterior of the tension sensor is sealed by a waterproof housing.

6. The urea tank according to claim 1, characterized in that: The data line of the tension sensor is connected to the analog-to-digital converter.

7. The urea tank according to claim 1, characterized in that: A plurality of urea tank liquid level sensors are evenly distributed at the bottom of the urea tank.

8. The urea tank according to claim 7, characterized in that: The data lines of multiple urea tank level sensors are all connected to the electronic control unit.

9. The urea tank according to claim 1, characterized in that: The urea tank is also provided with a urea tank sensor, which includes a liquid suction chamber and a liquid suction tube. The liquid suction chamber is connected to the liquid suction tube through a three-way joint, and a heating water pipe is wound around the outside of the liquid suction chamber.

10. The urea tank according to claim 9, characterized in that: The liquid suction tube is made of a flexible material, and one end of the liquid suction tube is connected to a weighted ball and a liquid suction filter.

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