A rain test chamber based on air pressure regulation

Abstract

The application discloses a rain test box based on air pressure regulation, which comprises a test box main body, wherein the test box main body comprises a test chamber, a spraying assembly and a rotating test rack are arranged in the test chamber, the spraying assembly is arranged at the top end of the test chamber, and the rotating test rack is rotationally connected to the bottom of the test chamber; an electric control chamber is arranged in the electric control chamber, a pressure tank, a PID controller, a water supply pipeline assembly and a driving assembly are arranged in the electric control chamber, the pressure tank is connected with an electric proportional valve, the PID controller is electrically connected with the electric proportional valve, and the output end of the pressure tank is connected with the water supply pipeline assembly through a pipeline; wherein the water supply pipeline assembly is connected with the spraying assembly, the water supply pipeline assembly supplies water for the spraying assembly, and the driving assembly is transmissionally connected with the rotating test rack and drives the rotating test rack to rotate.

Description

Technical Field

[0001] This disclosure relates to the field of rain test equipment technology, and in particular to a rain test chamber based on air pressure regulation. Background Technology

[0002] With technological advancements and rising standards, people's demands for coatings are also increasing, leading to the emergence of self-cleaning coatings. For self-cleaning coatings on building exteriors, the principle is to utilize a hydrophobic coating on the surface, allowing rainwater to carry away dust particles through raindrops. However, due to the diverse nature of rain conditions in nature, existing traditional gravity-based rain test chambers cannot accurately control the terminal velocity of raindrops and suffer from problems such as large flow fluctuations, making it difficult to simulate real-world rain conditions. Summary of the Invention

[0003] This disclosure provides a rain test chamber based on air pressure regulation to solve the technical problems recognized by the inventors.

[0004] This disclosure provides a rain test chamber based on air pressure regulation, including a test chamber body, the test chamber body comprising,

[0005] The test chamber is equipped with a spray assembly and a rotating test frame. The spray assembly is located at the top of the test chamber, and the rotating test frame is rotatably connected to the bottom of the test chamber.

[0006] The electrical control room is equipped with a pressure tank, a PID controller, a water supply pipeline assembly, and a drive assembly. The pressure tank is connected to an electro-proportional valve, and the PID controller is electrically connected to the electro-proportional valve. The output end of the pressure tank is connected to the water supply pipeline assembly through a pipeline.

[0007] The water supply pipeline assembly is connected to the spray assembly to supply water to the spray assembly, and the drive assembly is connected to the rotating test frame to drive the rotating test frame to rotate.

[0008] Preferably, the water supply pipeline assembly includes an inlet pipe, an outlet pipe, a supply pipe, a supply solenoid valve, a drain opening solenoid valve, and a high-speed solenoid valve. One end of the inlet pipe is connected to the water supply system, and the other end is connected to one end of the supply pipe. The other end of the supply pipe is connected to one end of the outlet pipe, and the other end of the outlet pipe is connected to the spray assembly. The output end of the pressure tank is connected to the supply pipe. The supply solenoid valve is located at the end of the supply pipe near the inlet pipe. The drain opening solenoid valve is located at the end of the supply pipe near the outlet pipe. The high-speed solenoid valve is located in the outlet pipe.

[0009] Preferably, there are two water supply pipes, one end of which is connected to the inlet pipe via a tee, and the other end of which is connected to the outlet pipe via a tee. Each water supply pipe is equipped with a water supply solenoid valve and a drain opening solenoid valve. There are two pressure tanks, which are connected to an electro-proportional valve. The two pressure tanks are switched via a distribution valve, and each pressure tank is connected to one of the two water supply pipes.

[0010] Preferably, a flow sensor is installed on the water outlet pipe, and the flow sensor is electrically connected to the PID controller.

[0011] Preferably, the spray assembly includes multiple spray pipes evenly distributed at the top of the test chamber, and multiple nozzles are connected through the spray pipes.

[0012] Preferably, the rotating test frame is provided with fixed plates at both ends, and the fixed plates are rotatably connected to the test chamber body through rotating shafts. The driving assembly includes a drive motor, and the output shaft of the drive motor is connected to one of the rotating shafts.

[0013] Preferably, the water spray speed of the nozzle is controlled by the PID controller, and the water spray speed V of the nozzle is calculated by the formula: V = , where ρ is the density of water, V0 is the velocity factor caused by height, S1 is the nozzle coefficient, and P is the pressure of the pressure tank.

[0014] Preferably, the rainfall h and droplet diameter D generated by the nozzle are calculated based on the average flow rate Qv measured by the flow sensor and the opening time T1 and closing time T2 of the high-speed solenoid valve within one pulse.

[0015] Preferably, the formula for calculating rainfall h is: S2 represents the rain-soaked area of ​​the laboratory.

[0016] Preferably, the formula for calculating the diameter D of the water droplet is D= .

[0017] The main beneficial effects of this disclosure are as follows: This invention uses a combination of air pressure and water pressure to spray water, and drives the liquid flow through a pressure tank. Due to the compressibility of gas, the fluid pressure fluctuation is small and more stable. Furthermore, the water pressure fluctuation is controlled within ±2% by a PID controller, which can more accurately simulate natural rain conditions.

[0018] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the rain test chamber according to an embodiment of the present disclosure;

[0021] Figure 2 This is a schematic diagram of the internal structure of the electrical control room according to an embodiment of the present disclosure;

[0022] Figure 3 This is a schematic diagram of the internal structure of the test chamber according to an embodiment of the present disclosure;

[0023] Figure 4 This is a pipeline layout diagram of an embodiment of the present disclosure;

[0024] Icons: 100-Test chamber body; 101-Test chamber; 102-Electrical control room; 200-Rotating test frame; 301-Inlet pipe; 302-Water supply pipe; 303-Outlet pipe; 304-Pressure tank; 305-Water supply solenoid valve; 306-Drainage opening solenoid valve; 307-High-speed solenoid valve; 308-Flow sensor; 309-Electro-proportional valve; 310-Distribution valve; 401-Spray pipe; 402-Spray head; 500-PID controller; 601-Drive motor; 602-Fixing plate; 603-Rotating shaft; 700-Test plate. Detailed Implementation

[0025] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments.

[0026] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0027] In the description of this disclosure, 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, and are only for the convenience of describing this disclosure and 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, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] Example

[0030] like Figure 1-4 As shown, this embodiment provides a rain test chamber based on air pressure regulation, including a test chamber body 100. The test chamber body 100 has a cuboid structure. The interior of the test chamber body 100 is divided into two spaces by a partition: a test chamber 101 and an electrical control room 102. The test chamber 101 is used to place the test plate 700 to be tested for rain testing, and the electrical control room 102 is used to install electrical equipment and pipelines.

[0031] Specifically, the test chamber 101 is equipped with a spray assembly and a rotating test frame 200. The spray assembly is located at the top of the test chamber 101 and is used to spray water to simulate rain. The rotating test frame 200 is rotatably connected to the bottom of the test chamber 101. The rotating test frame 200 is used to place the test plate 700 to be tested, and the rotating test frame 200 can rotate to simulate the change of direction of rainwater due to wind.

[0032] Specifically, the electrical control room 102 is equipped with a pressure tank 304, a PID controller 500, a water supply pipe 302 assembly, and a drive assembly. The pressure tank 304 provides air pressure and is connected to an electro-proportional valve 309, which controls the air pressure. The electro-proportional valve 309 is controlled by the PID controller 500. One end of the water supply pipe 302 is connected to a water supply system, such as a tap water system or other water-supplying system, and the other end is connected to a spray assembly to provide water for simulating rainwater. The pressure tank 304 and the water supply pipe 302 provide air pressure to the water supply pipe 302, which drives the liquid fluid. Due to the compressibility of gas, the fluid pressure fluctuation is small and stable. The drive mechanism drives the rotating test frame 200 to rotate, thereby simulating the change in the angle of rainwater blown by wind.

[0033] The water supply pipe 302 assembly includes an inlet pipe 301, an outlet pipe 303, a supply pipe 302, a supply solenoid valve 305, a drain opening solenoid valve 306, and a high-speed solenoid valve 307. One end of the inlet pipe 301 is connected to a water supply system, such as a tap water system or a water source via a water pump. The other end of the inlet pipe 301 is connected to one end of the supply pipe 302. The other end of the supply pipe 302 is connected to one end of the outlet pipe 303. The other end of the outlet pipe 303 is connected to the spray assembly. Pressure tank 304... The output end is connected to the water supply pipe 302 to provide air pressure inside the water supply pipe 302 to drive the liquid flow. The water supply solenoid valve 305 is located at the end of the water supply pipe 302 near the inlet pipe 301 and is used to control the liquid on / off. The water opening solenoid valve is located at the end of the water supply pipe 302 near the outlet pipe 303 and is used to control the water supply pipe 302 to enter the outlet pipe 303. The high-speed solenoid valve 307 is located in the outlet pipe 303 and the diameter of the water droplets is adjusted by adjusting the opening time of the high-speed solenoid valve 307.

[0034] In one embodiment, to maintain the continuous operation of the spray assembly, two water supply pipes 302 are provided. One end of each water supply pipe 302 is connected to the inlet pipe 301 via a tee, and the other end is connected to the outlet pipe 303 via a tee. Each water supply pipe 302 is equipped with an independent water supply solenoid valve 305 and a drain opening solenoid valve 306. Two pressure tanks 304 are also provided, and both pressure tanks 304 are connected to an electro-proportional valve 309. The two pressure tanks 304 are switched using a distribution valve 310. The two pressure tanks 304 are connected to the two water supply pipes 302 respectively. By switching the water supply between the two water supply pipes 302 and the pressure tanks 304, the continuous operation of the spray assembly can be ensured. This can be achieved by switching the water supply solenoid valves 305 and the drain opening solenoid valves 306 on the two water supply pipes 302. After selecting a water supply pipe 302, the corresponding pressure tank 304 is switched to provide compressed air through the distribution valve 310.

[0035] Furthermore, a flow sensor 308 is installed on the water outlet pipe 303. The flow sensor 308 is electrically connected to the PID controller 500. The flow sensor 308 is used to detect the average flow rate passing through the water outlet pipe 303 within a certain period of time and sends the detected data to the PID controller 500. The PID controller 500 calculates based on the detected data to control the valve, thereby adjusting the final amount of precipitation sprayed by the sprinkler assembly.

[0036] Specifically, the spray assembly includes multiple spray pipes 401 evenly distributed at the top of the test chamber 101. The inlet end of the multiple spray pipes 401 is connected to the outlet pipe 303. Multiple nozzles 402 are connected through the spray pipes 401. The multiple spray pipes 401 are arranged in parallel, and the multiple nozzles 402 are spaced 20mm apart. The nozzles 402 on the multiple spray pipes 401 are arranged in a rectangular array, so that the sprayed water droplets are more evenly distributed.

[0037] Specifically, the rotating test frame 200 has an arched structure, with fixed plates 602 fixed at both ends by bolts. One end of a rotating shaft 603 is connected to the fixed plate 602, and the other end of the rotating shaft 603 is rotatably connected to the test chamber body 100 through a bearing. The drive assembly includes a drive motor 601, which is installed in the electrical control room 102. The output shaft of the drive motor 601 is connected to one of the rotating shafts 603 through a coupling. The drive motor 601 drives the rotating shaft 603 to rotate, thereby causing the rotating test frame 200 to rotate, thus changing the angle of the test plate 700 installed on the rotating test frame 200, simulating the situation where rainwater is blown by the wind and changes its angle, thus enriching the test data and effects.

[0038] Specifically, the water spraying speed of the nozzle 402 is controlled by the PID controller 500. The formula for calculating the water spraying speed V of the nozzle 402 is: V = Where ρ is the density of water, V0 is the velocity factor caused by height, which can be confirmed by the distance between nozzle 402 and test plate 700, and S1 is the coefficient of nozzle 402, which can be confirmed by the product data of nozzle 402.

[0039] Specifically, based on the average flow rate Qv measured by the flow sensor 308 and the opening time T1 and closing time T2 of the high-speed solenoid valve 307 within one pulse, the rainfall h and droplet diameter D generated by the nozzle 402 are calculated. The average flow rate Qv is the average value of the pipeline flow rate detected by the flow sensor 308 over a period of time.

[0040] The formula for calculating rainfall h is as follows: S2 represents the rain-soaked area of ​​laboratory 101, which is determined based on the cross-sectional dimensions of laboratory 101 and the area of ​​the test plate 700. The PID controller 500 controls the average flow rate by controlling the opening degree of the drainage solenoid valve 306 based on the average flow rate data detected by the flow sensor 308. The value of h is used to control the amount of rainfall.

[0041] The formula for calculating the diameter D of the water droplet is: D = The PID controller 500 adjusts the size of the water droplet diameter D by controlling the opening time of the solenoid valve.

[0042] The working principle of this invention is as follows: Water is supplied through the water inlet pipe 301 connected to the water supply equipment. Water flows through the water inlet pipe 301 into one of the water supply pipes 302. The water supply pipe 302 is selected according to the on / off state of the water supply solenoid valve 305. When the water flows through the water supply pipe 302, the corresponding pressure tank 304 applies air pressure to it. The air pressure drives the liquid flow. Due to the compressibility of gas, the fluid pressure fluctuation is small and more stable. The water flows through the water supply pipe 302 into the water outlet pipe 303, and finally enters the spray pipe 401 through the high-speed solenoid valve 307. It is sprayed out from the nozzle 402 to form raindrops, which fall on the test plate 700.

[0043] This invention uses a PID controller 500 to regulate the pressure of compressed air in the pressure tank 304, controlling water pressure fluctuations within ±2%, thus allowing for precise adjustment of raindrops over a maximum range. The relationship between air pressure P and the velocity of water droplets ejected from the nozzle 402 is V = According to the requirements of the experiment, the electric proportional valve 309 is controlled to control the air pressure of the compressed air in the pressure tank 304, and finally control the speed of the water droplets.

[0044] This invention uses a PID controller 500 to control a high-speed solenoid valve 307 and a flow sensor 308 in combination, thereby adjusting the raindrop diameter. The formula for calculating the raindrop diameter D is D= The diameter of the water droplets is adjusted by regulating the opening time of the high-speed solenoid valve 307 through the PID controller 500.

[0045] This invention uses a PID controller 500 to control the opening degree of the drainage solenoid valve 306, thereby controlling the amount of rainfall h. The formula for calculating the amount of rainfall h is as follows: Furthermore, the present invention drives the rotating test frame 200 to rotate by driving motor 601, thereby changing the angle of test plate 700, thus simulating the situation in the natural environment where rainwater changes its angle due to being blown by the wind, making the test effect more realistic.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A rain test chamber based on air pressure regulation, characterized by, The utility model relates to a test box, including: Test box body, the test box body includes, Test chamber, the test chamber is provided with spray subassembly and rotary test frame in, spray subassembly sets up in test chamber top, rotary test frame swing joint is in test chamber bottom, Electric control chamber, the electric control chamber is provided with pressure tank, PID controller, water supply pipeline subassembly and drive assembly, pressure tank is connected with electric proportional valve, PID controller with electric proportional valve electricity is connected, pressure tank's output is connected with water supply pipeline subassembly through pipeline, Wherein, water supply pipeline subassembly with spray subassembly connection, for spray subassembly supplies water, drive assembly with rotary test frame transmission connects, drives rotary test frame and carries out rotation, Water supply pipeline subassembly includes water inlet pipe, water outlet pipe, water supply pipe, water supply solenoid valve, drainage opens solenoid valve and high -speed solenoid valve, water inlet pipe one end is connected with water supply system, and other end with water supply pipe one end connects, water supply pipe other end with water outlet pipe one end connects, water outlet pipe other end with spray subassembly connects, pressure tank's output with water supply pipe connects, water supply solenoid valve sets up in water supply pipe near water inlet pipe one end, drainage opens solenoid valve and sets up with water supply pipe near water outlet pipe one end, high -speed solenoid valve sets up in water outlet pipe.

2. The rain test chamber based on air pressure regulation according to claim 1, characterized in that Water supply pipe has two, two water supply pipe one end through tee joint together with water inlet pipe connects, two water supply pipe other end through tee joint together with water outlet pipe connects, each water supply pipe all is provided with water supply solenoid valve and drainage opens solenoid valve, pressure tank has two, two pressure tank common connection has electric proportional valve, two pressure tanks are switched through distribution valve, two pressure tank with two water supply pipe connects.

3. A rain test chamber based on air pressure regulation according to claim 2, characterized in that, Water outlet pipe is provided with flow sensor, flow sensor with PID controller electricity is connected.

4. The rain test chamber based on air pressure regulation according to claim 3, characterized in that Spray subassembly includes a plurality of evenly distributed in test chamber top spray pipeline, the spray pipeline is connected with a plurality of spray heads through.

5. The rain test chamber based on air pressure regulation according to claim 1, characterized in that, Rotary test frame both ends are provided with fixed plate respectively, the fixed plate is swing joint with test box body through pivot, drive assembly includes drive motor, drive motor's output shaft with one pivot transmission connects.

6. The rain test chamber based on air pressure regulation according to claim 4, characterized in that, The water spraying speed of the spray head is controlled by the PID controller, and the water spraying speed V of the spray head is calculated according to the formula: V = (P / S1) * V0 / ρ wherein ρ is the density of water, V0 is a height-induced speed factor, S1 is a spray head coefficient, and P is the pressure of the pressure tank air pressure.

7. A rain test chamber based on air pressure regulation according to claim 6, characterized in that, According to flow sensor measurement average flow Qv and high -speed solenoid valve in one pulse opening time T1 and closing time T2, calculate the rainfall h of spray head manufacturing and water drop diameter D.

8. A rain test chamber based on air pressure regulation according to claim 7, characterized in that, The formula for calculating the rainfall h is: where S2 is the rain area of the test room.

9. The rain test chamber based on air pressure regulation according to claim 7, characterized in that, The formula for calculating the water droplet diameter D is D = 4V / SA .

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