A whole vehicle lamp ventilation elbow pipe flow rate testing device

Abstract

The utility model relates to vehicle lamp fog removal technical field, concretely relates to a whole vehicle lamp ventilation elbow pipe flow rate testing arrangement. Including with the gas mass flowmeter of lamp inner chamber intercommunication of waiting for testing, gas mass flowmeter other end passes through ventilation elbow pipe and connects outside air, gas mass flowmeter electric connection has the flow control display unit for displaying the speed and gas flow data of vehicle, still include the vehicle-mounted cigarette lighter inverter of gas mass flowmeter power supply, vehicle-mounted cigarette lighter inverter input end is connected on the cigarette lighter of car, the gas flow passage that device forms by ventilation elbow pipe after passing gas mass flowmeter enters lamp inner chamber of waiting for testing. The utility model device can realize the flow rate measurement of ventilation elbow pipe, and is applicable to the lamp under various cabin arrangements, can pass through the power supply of vehicle-mounted cigarette lighter inverter, and the power consumption is low and is installed convenient, realizes the non -invasive monitoring of not destroying lamp structure, and realizes the dynamic correlation of speed and gas flow rate, guarantees the reliability of data.

Description

Technical Field

[0001] This utility model relates to the field of vehicle headlight fog removal technology, specifically to a device for testing the flow rate of a vehicle headlight ventilation bend. Background Technology

[0002] Every year, after-sales returns due to fogging of vehicle lights have become the top item for after-sales claims for various OEMs. Currently, the commonly used solutions for fogging of vehicle lights are anti-fog coatings, desiccants, and ventilation bends. Among them, ventilation bends are key components for achieving moisture balance inside and outside the light fixture and improving internal airflow. A reasonable placement of the bends can accelerate the airflow in the fogging area, thereby speeding up the dissipation of fog.

[0003] Currently, the industry still has some shortcomings in the performance verification of ventilation bends: the design simulation parameters lack actual support, and due to the differences in the layout of the vehicle's engine compartment, the effects of different ventilation bends on real vehicles are inconsistent; the laboratory and vehicle operating conditions are different, and bench tests cannot reproduce the complex airflow field in real driving; there is no effective means to test the flow velocity of ventilation bends during vehicle operation.

[0004] Traditional anemometers used in other industries differ significantly in structure from vehicle ventilation bends, resulting in low accuracy. Furthermore, the limited space within a vehicle body makes traditional anemometers bulky and unable to capture the flow field around the ventilation bend; they also cannot synchronize vehicle speed with the flow velocity at the ventilation openings. Therefore, given these issues, there is an urgent need for a device capable of measuring the gas velocity in ventilation bends during vehicle operation, suitable for applications at the ventilation bends of headlights. Utility Model Content

[0005] The problem this invention aims to solve is to develop a flow rate testing device for the ventilation bend assembly of a lamp; to achieve non-invasive monitoring without damaging the lamp structure; and to simultaneously record the instantaneous and cumulative values ​​of the flow rate through a sensor flow control display unit, thereby realizing a dynamic correlation between vehicle speed and flow rate and ensuring the reliability of the test data.

[0006] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a vehicle lighting fixture ventilation bend flow velocity testing device, comprising a gas mass flow meter connected to the inner cavity of the lighting fixture under test, the other end of the gas mass flow meter being connected to external air through a ventilation bend; the gas mass flow meter is electrically connected to a flow control display unit for displaying vehicle speed and gas flow data; it also includes an on-board cigarette lighter inverter that powers the gas mass flow meter, the input end of which is connected to the cigarette lighter of the vehicle; the device forms a gas flow channel from the ventilation bend through the gas mass flow meter into the inner cavity of the lighting fixture under test.

[0007] Preferably, the gas mass flow meter includes an inflow end and an outflow end. The inflow end is connected to the outlet of the ventilation bend, and the outflow end is connected to the inner cavity of the lamp to be tested through a connecting hose.

[0008] Preferably, the gas mass flow meter is model CAFS3000, used to collect the gas flow velocity in the ventilation bend synchronized with the vehicle speed.

[0009] Preferably, the flow control display unit is located in the driver's cab of the vehicle to read the gas flow rate in the ventilation bend that is synchronized with the vehicle speed.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model uses a gas mass flow meter as a sensor. After the gas mass flow meter is powered on, a stable temperature field is formed inside the flow meter. When the gas flows through, the temperature field is destroyed. The flow rate can be obtained based on the change in the temperature field. No temperature and pressure compensation is required. By utilizing the interdependence of heat and mass transfer of flowing gas, the high accuracy and high reliability of the flow meter are guaranteed.

[0012] 2. This utility model device is small in size and occupies little space. It connects the vehicle light bend tube and the sensor through a flexible hose, which can realize flexible installation and arrangement in different engine compartment spaces and is quick to assemble and disassemble.

[0013] 3. This utility model device has low power consumption and can power the gas mass flow meter by connecting the vehicle's cigarette lighter to the vehicle's cigarette lighter via an on-board cigarette lighter inverter, providing convenience for product testing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the testing device of this utility model;

[0015] Figure 2 This is a schematic diagram of the parameters of the gas mass flow meter of this utility model;

[0016] Figure 3 This is a simulation diagram of the flow field of the lamp according to this utility model;

[0017] Figure 4 This is a simulation diagram of fog dissipation according to this utility model;

[0018] Explanation of reference numerals in the attached diagram: 1. Lamp to be tested; 11. Lamp vent; 2. Connecting hose; 3. Gas mass flow meter; 31. Inlet end; 32. Outlet end; 4. Ventilation bend; 5. Vehicle cigarette lighter inverter; 6. Flow control display unit. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figure 1 The diagram shows the structural structure of the testing device of this utility model. This utility model provides a device for testing the flow rate of a ventilation bend in a vehicle lighting fixture. It includes a gas mass flow meter 3 connected to the inner cavity of the lighting fixture 1 under test. The other end of the gas mass flow meter 3 is connected to external air via a ventilation bend 4. The gas mass flow meter 3 includes an inflow end 31 and an outflow end 32. The inflow end 31 is connected to the outlet of the ventilation bend 4, and the outflow end 32 is connected to the inner cavity of the lighting fixture 1 under test via a connecting hose 2. The device forms a gas flow channel from the ventilation bend 4 through the gas mass flow meter 3 into the inner cavity of the lighting fixture 1 under test. The gas mass flow meter 3 is electrically connected to a flow control display unit 6 for displaying vehicle speed and gas flow data. It also includes an on-board cigarette lighter inverter 5 that powers the gas mass flow meter 3. The input end of the on-board cigarette lighter inverter 5 is connected to the cigarette lighter socket of the vehicle. Figure 2 The diagram shows the parameters of the gas mass flow meter of this invention. The gas mass flow meter 3, model CAFS3000, is used to collect the gas velocity within the ventilation bend 4, which is synchronized with the vehicle speed. The flow range of the gas mass flow meter 3 is 1–2000 sccm, the power supply voltage is 8–12V, the normal withstand pressure is 0.3 MPa, and the response time is 20–30 ms. The gas mass flow meter 3 is magnetically attached to the vehicle body. The flow control and display unit 6 is installed in the driver's cab of the vehicle to read the gas velocity within the ventilation bend 4, which is synchronized with the vehicle speed.

[0021] The outlet 32 ​​of the gas mass flow meter 3 is connected to the ventilation port of the lamp under test 1 via a connecting hose 2. The outlet of the ventilation bend 4 is connected to the inlet 31 of the gas mass flow meter 3. The gas mass flow meter 3 and the flow control display unit 6 are connected via a signal transmission line. When the vehicle moves, wind speed is generated, and airflow is generated at the ventilation bend 4. The air passes from the outside through the gas mass flow meter 3 and finally enters the lamp under test 1. At this time, the airflow velocity can be read on the flow control display unit 6. This utility model can realize non-intrusive monitoring without damaging the lamp structure and achieve dynamic correlation between vehicle speed and gas flow velocity, ensuring data reliability.

[0022] This invention assembles a gas mass flow meter 3 onto the ventilation duct of a vehicle headlight and designs a connection to a flow control and display unit 6. The device is small in size and has low power consumption, allowing for convenient and rapid testing and analysis of the flow rate in the ventilation bend 4. The flow control and display unit 6 uses a portable 7-inch touchscreen display for data acquisition from the Jiedingli gas flow meter, located in the driver's cab for easy reading of gas flow rate. The connecting hose 2, a rubber tube, connects the ventilation opening of the headlight 1 under test to the gas mass flow meter 3, ensuring the formation of an airflow channel. The gas mass flow meter 3 is a gas flow detection sensor. When in operation, a stable temperature field distribution is formed around the sensor. When gas flows through the sensor, the gas flow disrupts this temperature field distribution. Different masses of gas cause different disturbances to the temperature field distribution. The sensor measures this change and converts it into an electrical signal, which is then sent to the flow control and display unit 6. The ventilation bend 4 is a ventilation component for the vehicle lights, which can introduce air into the lights when the vehicle is in motion; the on-board cigarette lighter inverter 5 is the power supply module for the gas mass flow meter 3; the flow control display unit 6 is a signal processing display for the gas mass flow meter 3, which amplifies, conditions and displays the electrical signal of the gas mass flow meter 3.

[0023] When using a certain car light fixture, the inner diameter of the interfaces at both ends of the connecting hose 2 is 8mm, the inner diameter of the interface of the ventilation bend 4 is 8mm, the inner diameter of the light fixture ventilation port 11 of the light fixture under test is 6mm, and the inner diameter of the outlet end 32 and the inlet end 31 of the gas mass flow meter 3 are both 6mm. The light fixture ventilation port 11 is connected to the connecting hose 2 via a quick-connect coupling, the connecting hose 2 is connected to the outlet end 32 via a quick-connect coupling, and the inlet end 31 is connected to the ventilation bend 4 via a quick-connect coupling. The quick-connect coupling is model PU-8-6, made of PBT plastic, and is guaranteed to withstand a pressure of 1Mpa. The quick-connect coupling includes a large end that connects to an 8mm inner diameter tube and a small end that connects to a 6mm inner diameter tube. When the vehicle is in motion, the on-board cigarette lighter inverter 5 starts supplying power to the gas mass flow meter 3, creating a stable temperature field inside the gas mass flow meter 3. Outside air enters the testing device through the ventilation bend 4, flows through the gas mass flow meter 3, and then enters the lamp cavity of the lamp under test 1 through the connecting hose 2. The flow control display unit 6 reads the electrical signal generated by the gas mass flow meter 3, thereby conveniently reading the gas flow rate within the ventilation bend 4 and correlating it with the vehicle's speed for analysis. The data in the table below is obtained:

[0024] 5min 100 0.25 5min 80 0.15 5min 50 0.08

[0025] As shown in the table above, the flow rate of gas entering the lamp under test 1 increases with the increase of vehicle speed within the same time period. Through the flow control display unit 6 connected to the gas mass flow meter 3, the flow control display unit 6 reads the gas mass flow meter 3 and vehicle speed in real time in the driver's cab. Based on this, the flow velocity at the lamp ventilation port 11 can be calculated, and the dissipation time of the lamp after fogging at different vehicle speeds can be analyzed. Combined with the measured parameters, the flow field inside the lamp and the dissipation of fog under real-world scenarios can be simulated by software. Figure 3 , 4 The simulation is based on measured data, simulating the flow field inside the headlight and the dissipation speed after fogging. Once the user knows the dissipation time after fogging at a specific vehicle speed, they will know how long it will take for the fog to dissipate after the headlight fogs up, or what vehicle speed is more conducive to fog removal, and the user can choose to adjust the vehicle speed.

[0026] This utility model device can measure the flow velocity of the ventilation bend 4 and is applicable to lighting fixtures in various cabin layouts. It can be powered by an on-board cigarette lighter inverter 5, with low power consumption and convenient installation, requiring no additional 220V power supply. The connecting hose 2 to the ventilation hole of the lighting fixture 1 and the outlet of the gas mass flow meter 3 are quick-connect fittings to prevent air leakage in the flow channel. The flow control display unit 6 can be operated from the driver's cab, reading the gas flow velocity of the ventilation bend 4 synchronized with the vehicle speed. Combined with measured parameters, software can simulate the flow field inside the lamp and the dissipation of fog under real-world conditions.

Claims

1. A device for testing the flow velocity of a vehicle lighting ventilation bend, characterized in that: The device includes a gas mass flow meter (3) connected to the inner cavity of the lamp (1) under test, and the other end of the gas mass flow meter (3) is connected to the outside air through a ventilation bend (4); the gas mass flow meter (3) is electrically connected to a flow control display unit (6) for displaying vehicle speed and gas flow data; it also includes a vehicle-mounted cigarette lighter inverter (5) that supplies power to the gas mass flow meter (3), and the input end of the vehicle-mounted cigarette lighter inverter (5) is connected to the cigarette lighter of the car; the device forms a gas flow channel from the ventilation bend (4) through the gas mass flow meter (3) into the inner cavity of the lamp (1) under test.

2. The flow velocity testing device for the ventilation bend of a vehicle lighting fixture according to claim 1, characterized in that: The gas mass flow meter (3) includes an inflow end (31) and an outflow end (32). The inflow end (31) is connected to the outlet of the ventilation bend (4), and the outflow end (32) is connected to the inner cavity of the lamp (1) to be tested through the connecting hose (2).

3. The flow velocity testing device for the ventilation bend of a vehicle lighting fixture according to claim 1, characterized in that: The gas mass flow meter (3) is model CAFS3000 and is used to collect the gas flow rate in the ventilation bend (4) synchronized with the vehicle speed.

4. The flow velocity testing device for the ventilation bend of a vehicle lighting fixture according to claim 3, characterized in that: The flow control display unit (6) is installed in the car cab to read the gas flow rate in the ventilation bend (4) synchronized with the vehicle speed.

Images