Rain blowing simulation system

Abstract

The invention discloses a rain blowing simulation system, which is used for an automobile test and research and development laboratory and comprises an air blowing opening, a rain spraying device and a test distance adjusting unit, the blowing port is arranged in front of the test sample piece and is used for simulating head-on wind of the test piece in the driving process; the test distance adjusting unit is arranged between the air blowing opening and the test sample piece, is fixed on the ground or the air blowing opening, and can bear the rain spraying device to be close to or away from the test sample piece; the rain spraying device is fixedly mounted on the test distance adjusting unit, and a plurality of rain spraying nozzles are mounted on the rain spraying device facing the test sample piece; according to the rain spraying nozzle, one end of a water scattering nozzle is connected with a water source, and a scattering structure is arranged at the nozzle; the scattering structure is used for scattering water ejected from the water scattering nozzle; the compressed air nozzle is arranged on the outer wall of the water scattering nozzle in a surrounding and sleeving mode and is only used for driving water drops scattered by the scattering structure to be sprayed out so as to ensure that the coverage area of the water drops sprayed by the rain spraying nozzle is consistent under different water pressures and wind speeds.

Description

Technical Field

[0001] This invention relates to a rain simulation device, and more particularly to a simulation device for vehicle testing scenarios used in automotive testing and R&D laboratories. It can accurately reproduce wind and rain environments, providing reliable simulation conditions for vehicle performance testing under complex rain conditions. Background Technology

[0002] In the field of automotive testing, wind and rain simulation is an important means of evaluating key indicators such as vehicle sealing performance, appearance durability, and windshield wiper testing. Currently, the mainstream wind and rain simulation method in the industry is as follows: several nozzles are added to the air vent, each equipped with 3-6 water spray nozzles; when the nozzles are working, the trajectory of the sprayed raindrops is approximately conical, and the coverage area is related to the diffusion time, which is affected by wind speed and the distance between the nozzle and the test object—the lower the wind speed and the greater the distance, the longer the diffusion time and the larger the raindrop coverage area, and vice versa. Simultaneously, the raindrops are subject to a dual force during their movement: falling to the ground under gravity and moving towards the test object under wind force.

[0003] One of the core metrics in wind-blown rain simulation is the uniformity of rainfall on the test plane. This uniformity is primarily achieved through the superposition of nozzle spray areas, and the consistency of the superimposed area is crucial to ensuring uniformity. The nozzle spray area is closely related to several factors, including the vertical and horizontal spacing of the nozzles, wind speed, nozzle flow rate (pressure), and the distance between the nozzle and the test sample. When any of these factors is adjusted (such as changes in wind speed or nozzle flow rate), the rain coverage area of ​​the nozzles at a fixed test distance will change accordingly, thus affecting the uniformity of rainfall.

[0004] In existing technologies, to adapt to different vehicle models and test area sizes, the spray area is typically adjusted by changing the distance between nozzles or the rotation angle of the nozzles to maximize uniformity. For example, Chinese patent CN202421238104, "An Automatic Lifting and Lowering Spray System for an Automotive Environmental Wind Tunnel," provides a spray solution that, while achieving a certain degree of spray area adjustment, still suffers from the following significant problems: 1. The horizontal spacing of the nozzles cannot be adjusted: The existing device can only adjust the vertical height of the nozzle, and the horizontal spacing of the nozzles is fixed. It cannot be flexibly adapted to test requirements, which limits the precise adjustment of the spray area.

[0005] 2. The test distance is not adjustable: The spray device is fixedly installed at the air outlet, which means that the test distance between the nozzle and the test sample cannot be adjusted according to the actual test conditions, resulting in poor adaptability.

[0006] 3. Poor uniformity under different operating conditions: After each nozzle sprays raindrops, the movement of the raindrops approximates a conical diffusion, such as... Figure 1 As shown, the coverage area and diffusion time (related to wind speed and distance from the test object) are shown.

[0007] When the test distance is long and the wind speed is low, although the spray area of ​​a single nozzle is large, raindrops tend to converge to the ground under the action of gravity, resulting in no rain on the top of the test surface, or even some raindrops failing to reach the test sample, which seriously affects the uniformity of rainfall. When the test distance is close and the wind speed is high, the spray coverage area of ​​a single nozzle becomes smaller. Since the horizontal spacing between nozzles cannot be adjusted, the overlapping part of the nozzle spray area is reduced or even non-overlapping, which also leads to poor rainfall uniformity.

[0008] These shortcomings make it difficult for existing rain simulation devices to guarantee stable rainfall uniformity when facing test conditions such as different wind speeds, rainfall intensity (nozzle pressure), and fixed distances from the sample. This affects the accuracy and reliability of vehicle test results and fails to meet the needs of automotive testing and R&D laboratories for high-precision simulation environments.

[0009] Currently, domestic and international counterparts have not proposed effective improvement solutions to address the aforementioned shortcomings of existing technologies. The industry urgently needs a rain-blowing simulation technology solution that can adapt to various testing conditions and ensure the uniformity of rainfall. Summary of the Invention

[0010] The summary of this invention introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This summary is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0011] The technical problem to be solved by the present invention is to provide a rain-blowing simulation system that can adapt to various test conditions and ensure the uniformity of rain spray.

[0012] To solve the above-mentioned technical problems, the present invention provides a rain simulation system for automobile testing and R&D laboratories, comprising: a blower, a rain spray device, and a test distance adjustment unit; The air vent is positioned in front of the test specimen to simulate the oncoming wind during the test specimen's movement. The test distance adjustment unit is located between the air outlet and the test sample. It is fixed to the ground or the air outlet and can support the rain spray device to move closer to or further away from the test sample. The rain spraying device is fixedly installed on the test distance adjustment unit, and has multiple rain spraying nozzles facing the test sample. Rain spray nozzles, including: A water scattering nozzle, one end of which is connected to a water source, and a scattering structure is installed at the nozzle. A scattering structure, used to disperse water ejected from a water scattering nozzle; The compressed air nozzle is encircled and fitted around the outer wall of the water scattering nozzle. It is only used to drive the water droplets dispersed by the scattering structure to spray out, so as to ensure that the area covered by the water droplets sprayed by the rain spray nozzle is consistent under different water pressures and wind speeds.

[0013] Preferably, in a further improvement of the rain-blowing simulation system, the test distance adjustment unit includes a power source and an actuator; The power source is pneumatically driven or electrically driven, the actuator is a linear guide or a cylinder, and the air outlet of the compressed air jet source of the test distance adjustment unit is fixed.

[0014] Preferably, in a further improvement to the rain-blowing simulation system, the scattering structure adopts a V-shaped cone structure or a spiral structure to form water droplets.

[0015] Preferably, the rain-blowing simulation system is further improved in that the shape of the rain-spraying nozzle is a square nozzle, a circular conical nozzle, or a square conical nozzle.

[0016] Preferably, the rain-blowing simulation system is further improved by including: a nozzle spacing adjustment device, which is installed on the rain-spraying device and is used to adjust the horizontal distance and height distance between each rain-spraying nozzle.

[0017] Preferably, in a further improvement of the rain-blowing simulation system, the nozzle spacing adjustment device includes multiple horizontal slide rails and multiple vertical slide rails, and each rain-blowing nozzle can slide along the horizontal slide rails and vertical slide rails and be fixed in a designated position.

[0018] Preferably, the rain-blowing simulation system is further improved by including: The controller has pre-stored data on the coverage area of ​​a single nozzle, the uniformity of the spray overlap of all nozzles, water flow rate, wind speed, and the distance between the rain spray device and the test sample. Based on the data, it controls the test distance adjustment unit to move closer to or further away from the test sample.

[0019] This invention can achieve at least the following technical effects; 1. This invention ensures uniformity of rain spray; This invention abandons the design of fixing the spray gun to the air outlet in the prior art and adds a test distance adjustment unit. The device is powered by pneumatic or electric power source and is equipped with linear guide rails, cylinders and other actuators, which can flexibly adjust the distance between the water spray gun and the test sample.

[0020] When the test distance is long and the wind speed is low, shortening the test distance reduces the time it takes for raindrops to fall under gravity, preventing them from converging on the ground and ensuring that the top of the test surface is covered by rainwater while ensuring that the raindrops can accurately reach the test sample. When the test distance is short and the wind speed is high, increasing the test distance allows sufficient space for raindrop diffusion, avoiding insufficient overlap due to a small coverage area, and providing a basic guarantee for uniformity from the perspective of distance.

[0021] In addition, the test distance adjustment unit is reliably fixed to the ground or air vent, which can effectively prevent the equipment from shifting under high wind speeds, further ensuring the stability of distance adjustment and the uniformity of rainfall.

[0022] 2. This invention can be adapted to different testing scenarios; Regardless of changes in test conditions (including wind speed, rainfall intensity, distance from the test sample, vehicle model, and test area size), this invention ensures uniform rainfall distribution on the test plane, avoiding problems such as no rainfall at the top of the test surface, raindrops failing to reach the test sample, or insufficient overlap of spray areas. This meets the high-precision requirements of automotive testing for simulated environments. This invention can flexibly adapt to the testing needs of different vehicle models and test areas of varying sizes without requiring replacement of the entire rain spray system, reducing the adaptation costs of testing equipment.

[0023] 3. This invention can provide a stable nozzle coverage area; To address the problem that the coverage area of ​​the nozzle in the existing technology is greatly affected by water pressure (water flow rate) and wind speed, the present invention adds a scattering structure to each spray point. The rain spray nozzle consists of a water scattering nozzle, a scattering structure and a compressed air nozzle.

[0024] The scattering structure uses V-shaped cones, spiral structures, and other scattering mechanisms to form water droplets. The compressed air nozzle does not additionally disperse the water droplets; it only provides directional thrust. This design can counteract the interference of different water pressures and wind speeds on the movement of water droplets: when the water pressure increases or the wind speed decreases, the thrust of the compressed air can suppress excessive diffusion of water droplets; when the water pressure decreases or the wind speed increases, the thrust of the compressed air can help the water droplets maintain a preset coverage area, ensuring that the coverage area of ​​a single nozzle remains consistent regardless of changes in operating conditions.

[0025] A consistent coverage area of ​​a single nozzle ensures a stable superposition area of ​​spray zones from multiple nozzles, fundamentally solving the problem of fluctuations in superposition area caused by changes in operating conditions, which in turn affects uniformity in existing technologies.

[0026] 4. This invention improves ease of operation and reduces testing difficulty; The test distance adjustment unit is pneumatically or electrically driven, and the adjustment process does not require manual disassembly or relocation of equipment, making it simple and efficient to operate. The scattering structure can automatically adapt to changes in water pressure and wind speed, eliminating the need for operators to frequently calibrate nozzle parameters, reducing adjustment steps during the test process, and lowering the difficulty of operation and human error.

[0027] Therefore, no complex mechanical modifications or parameter calibrations are required during the testing process, allowing for rapid switching between different operating conditions, improving testing efficiency, and lowering the technical threshold for operators.

[0028] 5. Higher accuracy in rainfall simulation, supporting the reliability of test results; The scattering structure of this invention ensures the uniformity of water droplet formation. The directional thrust provided by the scattering structure can simulate the pushing effect of real wind on raindrops, making the trajectory of raindrops more closely resemble the state of natural wind and rain. At the same time, the stable uniformity of rainfall avoids the deviation of test results caused by the distortion of the simulated environment, thereby improving the credibility and reference value of the test data.

[0029] The raindrop diffusion pattern and trajectory provided by this invention are closer to the real wind and rain environment, and the simulation accuracy is significantly improved, providing more reliable environmental support for testing automotive sealing performance, appearance durability, etc. Attached Figure Description

[0030] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the invention, supplementing the description in the specification. However, the drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by exemplary embodiments of the invention. The invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the theoretical spray angle and coverage area.

[0031] Figure 2 This is a schematic diagram of the overall architecture of the present invention.

[0032] Figure 3 This is a cross-sectional schematic diagram of the rain spray nozzle of the present invention. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and various details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the technical solutions of these exemplary embodiments are fully conveyed to those skilled in the art. It should be understood that when an element is referred to as "connected" or "combined" to another element, the element can be directly connected or combined to the other element, or there may be intermediate elements. The difference is that when an element is referred to as "directly connected" or "directly combined" to another element, there are no intermediate elements. Throughout the drawings, the same reference numerals always denote the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] First embodiment; refer to Figure 1 As shown, the present invention provides a rain simulation system for automotive testing and R&D laboratories, characterized in that it includes: a blower, a rain spray device, and a test distance adjustment unit; The air vent is positioned in front of the test specimen to simulate the oncoming wind during the test specimen's movement. A blower is a large cross-sectional area blower device in front of a test specimen, for example, with a cross-sectional area of ​​2.5m wide x 2.5m high, and an adjustable blower speed of 5~250Km / h, used to simulate the wind on the test specimen, such as the headwind of a car during driving. The test distance adjustment unit is located between the air outlet and the test sample. It is fixed to the ground or the air outlet and can support the rain spray device to move closer to or further away from the test sample. When the test distance adjustment unit is fixed to the ground, it drives the rain spray device to move through the power source, so that the rain spray device moves closer to or away from the test sample. When the test distance adjustment unit is fixed to the air outlet, it is driven by the power source to move closer to or away from the test sample along with the rain spray device; The rain spraying device is fixedly installed on the test distance adjustment unit, and has multiple rain spraying nozzles facing the test sample. refer to Figure 2As shown, the rain spray nozzle can be selected to be a square nozzle, a circular conical nozzle, or a square conical nozzle, including: A water scattering nozzle, one end of which is connected to a water source, and a scattering structure is installed at the nozzle. A scattering structure, used to disperse water ejected from a water scattering nozzle; The compressed air nozzle is encircled and fitted around the outer wall of the water scattering nozzle. It is only used to drive the water droplets dispersed by the scattering structure to spray out, so as to ensure that the area covered by the water droplets sprayed by the rain spray nozzle is consistent under different water pressures and wind speeds.

[0035] Second embodiment; The present invention provides a test distance adjustment unit that can be used in the first embodiment described above, which includes a power source and an actuator; The power source is pneumatically driven or electrically driven, the actuator is a linear guide or a cylinder, and the air outlet of the compressed air jet source of the test distance adjustment unit is fixed.

[0036] For example, when the test distance adjustment unit is fixed to the ground, it drives the rain spray device to move on the linear guide rail via a motor, so that the rain spray device moves closer to or further away from the test sample. When the test distance adjustment unit is fixed to the air outlet, it is driven by the motor to move along the linear guide rail with the rain spray device to move closer to or further away from the test sample. Third embodiment; The present invention provides a scattering structure that can be used in the first embodiment described above, which employs a V-shaped cone structure or a spiral structure to form water droplets.

[0037] Fourth embodiment; The present invention provides a nozzle spacing adjustment device that can be used in the rain spray device described in the first embodiment above; The nozzle spacing adjustment device is installed on the rain spraying device and is used to adjust the horizontal and vertical distances between each rain spray nozzle. The nozzle spacing adjustment device includes multiple horizontal slide rails and multiple vertical slide rails. Each rain spray nozzle can slide along the horizontal and vertical slide rails and be fixed in a designated position.

[0038] Fifth embodiment; The fifth embodiment of the present invention is a further improvement based on the first to fourth embodiments described above, and further includes: The controller has pre-stored data on the coverage area of ​​a single nozzle, the uniformity of the spray overlap of all nozzles, water flow (or water pressure), wind speed, and the distance between the rain spray device and the test sample. Based on the data, it controls the test distance adjustment unit to move closer to or further away from the test sample.

[0039] The relationship data can be obtained through calibration, and by adding a controller, the rain simulation system can be quickly adjusted to make its rain spray uniformity meet the experimental design requirements.

[0040] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless explicitly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0041] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A rain simulation system for use in automotive testing and R&D laboratories, characterized in that, include: Air vent, rain spray device, and test distance adjustment unit; The air vent is positioned in front of the test specimen to simulate the oncoming wind during the test specimen's movement. The test distance adjustment unit is located between the air outlet and the test sample. It is fixed to the ground or the air outlet and can support the rain spray device to move closer to or further away from the test sample. The rain spraying device is fixedly installed on the test distance adjustment unit, and has multiple rain spraying nozzles facing the test sample. Rain spray nozzles, including: A water scattering nozzle, one end of which is connected to a water source, and a scattering structure is installed at the nozzle. A scattering structure, used to disperse water ejected from a water scattering nozzle; The compressed air nozzle is encircled and fitted around the outer wall of the water scattering nozzle. It is only used to drive the water droplets dispersed by the scattering structure to spray out, so as to ensure that the area covered by the water droplets sprayed by the rain spray nozzle is consistent under different water pressures and wind speeds.

2. The rain-simulating system as described in claim 1, characterized in that, The test distance adjustment unit includes a power source and an actuator; The power source is pneumatic or electric, and the actuator is a linear guide or a cylinder.

3. The rain simulation system as described in claim 1, characterized in that: The scattering structure employs a V-shaped cone or spiral structure to form water droplets.

4. The rain simulation system as described in claim 1, characterized in that: The shape of the rain spray nozzle is a square nozzle, a circular conical nozzle, or a square conical nozzle.

5. The rain-simulating system as described in claim 1, characterized in that: The rain spraying device has a nozzle spacing adjustment device, which is installed on the rain spraying device and is used to adjust the horizontal distance and height distance between each rain spray nozzle.

6. The rain-blowing simulation system as described in claim 1, characterized in that: The nozzle spacing adjustment device includes multiple horizontal slide rails and multiple vertical slide rails. Each rain spray nozzle can slide along the horizontal and vertical slide rails and be fixed in a designated position.

7. The rain-blowing simulation system as described in any one of claims 1-6, characterized in that, Also includes: The controller has pre-stored data on the coverage area of ​​a single nozzle, the uniformity of the spray overlap of all nozzles, water flow rate, wind speed, and the distance between the rain spray device and the test sample. Based on the data, it controls the test distance adjustment unit to move closer to or further away from the test sample.

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