A calibration device for a liquid level sensor for a vehicle

Abstract

The utility model provides a kind of checking device of liquid level sensor for vehicle, including sensor installation cylinder, glass column liquid level meter with liquid level scale, base, monitoring cabinet and direct current power supply, liquid level meter is installed on the outside wall of installation cylinder, monitoring cabinet and direct current power supply are respectively arranged in the two sides of installation cylinder and liquid level meter, and are fixedly installed on base;The liquid level sensor to be detected is connected monitoring cabinet and direct current power supply by circuit, and is internally provided with intelligent controller.The utility model carries out quick check to liquid level sensor outside vehicle, effectively avoids the problem that liquid level sensor is difficult to disassemble after detecting fault;Meanwhile, by setting alarm device and digital display screen on intelligent controller, whether the feedback value of sensor is correct compared with actual can be monitored, whether high liquid level, low liquid level, insufficient liquid level alarm is correct is simulated, and it is convenient for detection personnel to judge quickly.

Description

Technical Field

[0001] This utility model relates to the field of special vehicle technology, and in particular to a device for calibrating a liquid level sensor installed on a special vehicle. Background Technology

[0002] Special-purpose vehicles are used for specific transportation tasks or special operations. Many special-purpose vehicles are modified to include liquid level sensors according to their usage needs. For example, diesel generator trucks are equipped with oil level sensors, while water purification trucks, shower trucks, and catering trucks are equipped with water level sensors. Sensors are mostly installed into the vehicle using threaded or flanged connections. In current technology, sensors are pre-calibrated at the factory and are usually installed directly without verification, with centralized calibration only performed after all the upper-mounted equipment is installed. If a sensor malfunctions after the upper-mounted equipment is installed, disassembly is difficult due to the limited space inside the vehicle, especially when sensor installation methods differ due to different working principles. This may require removing partitions and other structures, increasing the workload of the installation personnel.

[0003] Therefore, a device is needed to quickly calibrate the liquid level sensor before it is installed on the vehicle. Utility Model Content

[0004] The purpose of this invention is to provide a calibration device for automotive liquid level sensors that can adapt to various installation interfaces, enable rapid and accurate calibration of liquid level sensors, and has an alarm function, thereby improving detection efficiency and reliability and solving the above-mentioned problems.

[0005] This utility model adopts the following technical solution: a calibration device for a vehicle liquid level sensor, comprising a sensor mounting cylinder, a glass column liquid level gauge with liquid level scale, a base, a monitoring cabinet, and a DC power supply. The mounting cylinder is a hollow tube with an open top and a closed bottom, vertically fixed on the base. The liquid level gauge is parallel to the mounting cylinder and mounted on the outer wall of the mounting cylinder. The monitoring cabinet and the DC power supply are respectively located on both sides of the mounting cylinder and the liquid level gauge, and are both fixedly mounted on the base. The liquid level sensor to be tested is connected to the monitoring cabinet and the DC power supply via wiring. The monitoring cabinet includes a cabinet body, an intelligent controller inside the cabinet body, and a digital display screen and indicator lights on the outside.

[0006] Furthermore, a drain ball valve is installed below the sealing end of the mounting cylinder.

[0007] Furthermore, a pressure sensor interface is provided on the side of the sealing end of the mounting cylinder.

[0008] Furthermore, the liquid level sensor includes an immersion sensor and a side-mounted level sensor. The immersion sensor is inserted into the mounting cylinder during use, and the side-mounted level sensor is mounted on the pressure sensor interface. The power lines of both the immersion sensor and the side-mounted level sensor are connected to the DC power supply, and the signal lines are connected to the monitoring cabinet.

[0009] Furthermore, the level gauge includes an upper connecting pipe, a graduated glass tube, and a lower connecting pipe. The upper and lower connecting pipes are valve-connected joints. The upper connecting pipe is disposed at the upper end of the graduated glass tube and connects to the open end of the mounting cylinder, connecting the graduated glass tube and the mounting cylinder. The lower connecting pipe is disposed at the lower end of the graduated glass tube and connects to the closed end of the mounting cylinder, connecting the graduated glass tube and the mounting cylinder.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. This utility model can quickly calibrate the liquid level sensor outside the vehicle, effectively avoiding the problem of difficult disassembly when the liquid level sensor is detected after it is installed in the vehicle. The device has a simple structure, fast calibration, and multiple installation interfaces, and can be used for the detection of various liquid level sensors.

[0012] 2. This utility model, by setting an alarm device and a digital display screen on the intelligent controller, can monitor whether the feedback values ​​of the sensor are correct compared with the actual values, and whether the alarms for high liquid level, low liquid level, and insufficient liquid level are correct, so as to facilitate the quick judgment of the testing personnel. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0014] Figure 2 This is a schematic diagram of the level gauge components;

[0015] Figure 3 This is a schematic diagram of the external appearance of the monitoring cabinet;

[0016] Figure 4 This is a rear view of the present invention.

[0017] Legend: 1-Installation cylinder, 2-Level gauge, 3-Base, 4-Monitoring cabinet, 5-Drain ball valve, 6-DC power supply, 7-Pressure sensor interface, 21-Upper connecting pipe, 22-Graded glass tube, 23-Lower connecting pipe, 41-Cabinet, 42-Digital display screen, 43-Indicator light. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Please see Figure 1-4 This utility model provides a calibration device for a vehicle liquid level sensor, comprising a sensor mounting cylinder 1, a glass column liquid level gauge with liquid level scale 2, a base 3, a monitoring cabinet 4, and a DC power supply 6. The mounting cylinder 1 is a hollow tube with an open top and a closed bottom, vertically fixed on the base 3. The liquid level gauge 2 is parallel to the mounting cylinder 1 and mounted on the outer wall of the mounting cylinder 1. The monitoring cabinet 4 and the DC power supply 6 are respectively located on both sides of the mounting cylinder 1 and the liquid level gauge 2, both fixedly mounted on the base 3. The liquid level sensor to be tested is connected to the monitoring cabinet 4 and the DC power supply 6 via wiring. The liquid level sensor typically has three wires: a power wire, a ground wire, and a signal wire (not shown in the figure). The power wire is connected to the DC power supply 6, and the signal wire is connected to the monitoring cabinet 4. The monitoring cabinet includes a cabinet body 41, inside which is a smart controller (not shown in the figure), and outside which is a digital display screen 42 and indicator lights 43. The smart controller is an existing smart single-loop digital display controller. The smart controller is connected to the liquid level sensor through a feedback signal line and can display the liquid level information fed back by the liquid level sensor on the digital display screen 42.

[0022] A drain ball valve 5 is installed below the sealing end of the mounting cylinder 1, and a pressure sensor interface 7 is provided on the side of the sealing end of the mounting cylinder 1.

[0023] There are two types of liquid level sensors commonly used in special vehicles: submersible liquid level sensors and non-contact sensors. Submersible liquid level sensors are top-mounted vertical liquid level sensors that are directly immersed in the sensor mounting cylinder 1 for use. Non-contact sensors are side-mounted horizontal sensors that measure liquid level by utilizing the principle that the hydrostatic pressure of the liquid is proportional to the liquid height. They are installed on the closed side of the sensor mounting cylinder 1 through the pressure sensor interface 7.

[0024] Further as Figure 1 As shown, the level gauge 2 includes an upper connecting pipe 21, a graduated glass tube 22, and a lower connecting pipe 23. The upper connecting pipe 21 and the lower connecting pipe 23 are valve-connected. The upper connecting pipe 21 is located at the upper end of the graduated glass tube 22 and is connected to the open end of the mounting cylinder 1, connecting the graduated glass tube 22 and the mounting cylinder 1. The lower connecting pipe 23 is located at the lower end of the graduated glass tube 22 and is connected to the closed end of the mounting cylinder 1, connecting the graduated glass tube 22 and the mounting cylinder 1.

[0025] Example 1: Detection of a top-mounted vertically installed liquid level sensor

[0026] The liquid level sensor is inserted from the top of the sensor mounting cylinder 1. Liquid of a scale matching the range of the liquid level sensor is added into the sensor mounting cylinder 1. At this time, the liquid in the sensor mounting cylinder 1 is connected to the graduated glass tube 22 through the upper connecting pipe 21 and the lower connecting pipe 23. The liquid level in the graduated glass tube 22 and the liquid level in the sensor mounting cylinder 1 are kept at the same level according to the principle of hydrostatic equilibrium. The power cord of the submersible liquid level sensor is connected to the DC power supply 6, and the feedback signal line is connected to the monitoring cabinet 4.

[0027] Example 2: Detection of side-mounted level sensor

[0028] The sensor is installed on the pressure sensor interface 7. Liquid of the same scale as the level sensor is added into the sensor mounting cylinder 1. At this time, the liquid in the sensor mounting cylinder 1 is connected to the graduated glass tube 22 through the upper connecting pipe 21 and the lower connecting pipe 23. The liquid level in the graduated glass tube 22 and the liquid level in the sensor mounting cylinder 1 are kept at the same level according to the principle of hydrostatic equilibrium. The power cord of the side-mounted level sensor is connected to the DC power supply 6, and the feedback signal line is connected to the monitoring cabinet 4. The side-mounted level sensor feeds back the sensed liquid static pressure data to the intelligent controller. The intelligent controller calculates the liquid level data based on the pressure data and displays it on the digital display screen 42.

[0029] The detection steps for Examples 1 and 2 are as follows: ① Set the signal type of the liquid level sensor output on the intelligent controller, and the current liquid level height can be displayed normally on the digital display screen 42; ② Personnel verify whether the value displayed on the digital display screen 42 is consistent with the value of the liquid level 2 on the glass column with liquid level scale; ③ Adjust the liquid level height of the sensor mounting cylinder 1 multiple times by using the drain ball valve 5 to verify whether the value displayed on the digital display screen 42 is consistent with the value of the liquid level 2 on the glass column with liquid level scale; ④ Plot a curve graph. High, low, and insufficient liquid level alarm points can be set on the intelligent controller. When the liquid level reaches the set alarm point, the indicator light 43 will alarm.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A calibration device for a vehicle liquid level sensor, characterized in that: The system includes a sensor mounting cylinder, a glass column level gauge with a liquid level scale, a base, a monitoring cabinet, and a DC power supply. The mounting cylinder is a hollow tube with an open top and a closed bottom, vertically fixed on the base. The level gauge is parallel to the mounting cylinder and mounted on its outer side wall. The monitoring cabinet and DC power supply are respectively located on both sides of the mounting cylinder and the level gauge, and are both fixedly mounted on the base. The liquid level sensor to be detected is connected to the monitoring cabinet and the DC power supply via wiring. The monitoring cabinet includes a cabinet body, an intelligent controller inside the cabinet body, and a digital display screen and indicator lights on the outside.

2. The calibration device for a vehicle liquid level sensor according to claim 1, characterized in that: A drain ball valve is installed below the sealing end of the mounting cylinder.

3. The calibration device for a vehicle liquid level sensor according to claim 1, characterized in that: A pressure sensor interface is provided on the side of the sealing end of the mounting cylinder.

4. The calibration device for a vehicle liquid level sensor according to claim 3, characterized in that: The liquid level sensor includes an immersion sensor and a side-mounted level sensor. The immersion sensor is inserted into the mounting cylinder during use, and the side-mounted level sensor is mounted on the pressure sensor interface. The power lines of both the immersion sensor and the side-mounted level sensor are connected to the DC power supply, and the signal lines are connected to the monitoring cabinet.

5. The calibration device for a vehicle liquid level sensor according to claim 1, characterized in that: The level gauge includes an upper connecting pipe, a graduated glass tube, and a lower connecting pipe. The upper and lower connecting pipes are valve-connected. The upper connecting pipe is located at the upper end of the graduated glass tube and connects to the open end of the mounting cylinder, connecting the graduated glass tube and the mounting cylinder. The lower connecting pipe is located at the lower end of the graduated glass tube and connects to the closed end of the mounting cylinder, connecting the graduated glass tube and the mounting cylinder.

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