A low-temperature droplet impact icing experiment table

Abstract

The application aims to provide a low-temperature droplet impact icing experiment table, which comprises a temperature insulation outer frame, an internal low-temperature experiment area outer frame, an automatic test bench and a bottom plate, the temperature insulation outer frame, the internal low-temperature experiment area outer frame and the bottom plate constitute an experiment space, the automatic test bench is located in the experiment space, the automatic test bench comprises a frame, a horizontal movable plate and a threaded screw rod, a perforated aluminum plate is installed at the bottom of the frame, the top of the threaded screw rod is connected to the top of the frame, the bottom of the threaded screw rod is located above the perforated aluminum plate and is connected to a z-direction low-temperature stepping motor, the middle part of the threaded screw rod passes through the horizontal movable plate and is matched with the horizontal movable plate, an x-direction slide rail and a y-direction slide rail are installed on the horizontal movable plate, a sliding block is installed on the y-direction slide rail, and the y-direction slide rail is located between the two x-direction slide rails and moves along the x-direction slide rails. The application guarantees the low-temperature environment of the experiment area, realizes multiple experiments under the same working condition by using the stepping motor and program control, and reduces the error caused by human factors.

Description

Technical Field

[0001] The present invention relates to an experimental apparatus, specifically an experimental apparatus for low-temperature environments. Background Technology

[0002] In recent years, scholars from various countries have increasingly focused on research into harsh environments such as low temperatures. Under these conditions, the freezing mechanism of droplets at low temperatures has gradually attracted researchers' attention, with the study of droplet impact freezing processes becoming a key focus. The air temperature surrounding supercooled droplets in the air is extremely low, but environmental control in the experimental area has long been a challenge. Maintaining a low-temperature environment within the experimental area is paramount. Furthermore, multiple sets of experiments must be conducted under the same conditions to reduce experimental errors. However, the original low-temperature environment is easily disrupted when changing experimental equipment. Therefore, to achieve the goal of conducting multiple sets of experiments under the same low-temperature environment, and under stringent environmental and experimental requirements, it is essential to redesign a droplet experimental platform suitable for low-temperature environments. Summary of the Invention

[0003] The purpose of this invention is to provide a cryogenic droplet impact icing experimental stage that can guarantee a low-temperature environment in the experimental area.

[0004] The objective of this invention is achieved as follows:

[0005] This invention discloses a cryogenic droplet impact icing experimental stage, characterized by comprising an insulated outer frame, an inner cryogenic experimental zone outer frame, an automated experimental platform, and a base plate. The insulated outer frame, the inner cryogenic experimental zone outer frame, and the base plate constitute an experimental space. The automated experimental platform is located within the experimental space. The automated experimental platform includes a frame, a horizontal movable plate, and a threaded screw. A perforated aluminum plate is installed at the bottom of the frame. The top of the threaded screw is connected to the top of the frame, and the bottom of the threaded screw is located above the perforated aluminum plate and connected to a Z-axis cryogenic stepper motor. The middle part of the threaded screw passes through and cooperates with the horizontal movable plate. An X-axis slide rail and a Y-axis slide rail are installed on the horizontal movable plate. A slider is installed on the Y-axis slide rail, which is located between the two X-axis slide rails and moves along them.

[0006] The present invention may also include:

[0007] 1. The Y-axis low-temperature stepper motor is connected to the synchronous belt, and the slider is pressed against the synchronous belt. The Y-axis low-temperature stepper motor drives the slider to move along the Y-axis slide rail by controlling the synchronous belt.

[0008] 2. A fixed optical rod is installed in the automated test bench. The top end of the fixed optical rod is fixed to the top end of the frame, the bottom end of the fixed optical rod is fixed to the bottom end of the frame, and the middle part of the fixed optical rod passes through the horizontal movable plate and limits its movement in the z-direction.

[0009] 3. A y-axis phase switch is installed at the mating point of the y-axis slide rail and the x-axis slide rail, and an x-axis phase switch is installed on the perforated aluminum plate.

[0010] 4. Optical glass is installed on the outer frame of the internal low-temperature experimental area.

[0011] 5. A top air vent is provided at the top of the thermal insulation frame, a side air vent is provided on the side of the thermal insulation frame, and a bottom air inlet is provided on the bottom plate.

[0012] 6. The perforated aluminum plate is in a multi-hole form.

[0013] 7. Lay quicklime on the base plate.

[0014] The advantages of this invention are: it ensures a low-temperature environment in the experimental area, and utilizes stepper motors and program control to achieve multiple sets of experiments under the same working conditions, thereby reducing errors caused by human factors. Attached Figure Description

[0015] Figure 1a This is a three-dimensional schematic diagram of the entire invention. Figure 1b This is an overall front view of the present invention. Figure 1c This is an overall side view of the present invention;

[0016] Figure 2 This is a schematic diagram of the top air vent;

[0017] Figure 3a This is a schematic diagram of an automated test bench. Figure 3b This is a schematic diagram of a horizontal movable plate structure. Detailed Implementation

[0018] The invention will now be described in more detail with reference to the accompanying drawings:

[0019] Combination Figures 1a-3b The experimental platform of the present invention consists of four parts: an insulating outer frame 1, an inner experimental area outer frame 2, an automated experimental platform frame 3, and a base plate 4.

[0020] The thermal insulation outer frame has vents 1.1 and 1.2 on both sides, connected by flanges; the base plate 4 has an air inlet 4.1 connected to the air inlet pipe by a flange; the inner low-temperature experimental area outer frame 2 has an air inlet 2.1 only at the top, and an optical glass 2.2 is inlaid on the front for photography; the automated test bench 3 includes an aluminum profile frame 3.1, a threaded screw 3.2, a fixed light rod 3.3, a horizontal movable plate 3.4, a slide rail 3.5 (sliding in the x-direction), a slide rail 3.6 (sliding in the y-direction), a bottom perforated aluminum plate 3.7, a low-temperature stepper motor 3.8 (controlling the horizontal movable plate 3.4 to move in the z-direction), a low-temperature stepper motor 3.9 (controlling the slider on the slide rail to move in the y-direction), a phase switch 3.10 (resetting the slider in the y-direction), a phase switch 3.11 (resetting the horizontal movable plate), and a slider 3.12.

[0021] The air vents 1.1 and 1.2 on the thermal insulation outer frame and the air inlet 4.1 on the bottom plate are all connected by external flanges, which facilitates future installation and replacement. In addition, the external flanges are all made of plexiglass to reduce heat conduction.

[0022] The internal automated test bench is driven by motors, and the motor rotation is controlled by an external computer program. The low-temperature stepper motor 3.8 realizes the movement of the horizontal movable plate 3.4 in the z direction, and the low-temperature stepper motor 3.9 realizes the movement of the slider 3.12 on the slide rail 3.6 in the y direction. Through the cooperation of the two motors, the movement of the slider 3.12 in the z and y directions is realized. Multiple sets of experiments at different positions are realized without damaging the internal low-temperature environment, which greatly reduces the error caused by human factors.

[0023] The metal base plate 3.7 of the internal experimental platform adopts a porous design, which utilizes the principle of porous rectification to allow the air intake below to flow into the experimental area through the surrounding circular holes, reducing the impact of the air intake airflow on the droplet movement in the experimental area; the cold airflow flows into the experimental area from the surrounding circular holes, forming a cold air layer inside, which is beneficial for low temperature environment control.

[0024] The phase switches in the z and y directions are used to calibrate the initial positions of the horizontal movable plate 3.4 and the slider 3.12. Before each experiment, the horizontal movable plate 3.4 and the slider 3.12 must touch the reset switch before moving the corresponding distance to facilitate subsequent shooting and calculation.

[0025] The internal test bench is fixed with aluminum material 3.1 around its perimeter and fixed light rods 3.3 are installed on both sides of the four cylinders. The purpose is to ensure that the horizontal moving plate 3.4 reduces shaking during movement.

[0026] The 3.8 and 3.9 motors used in the experimental platform are both low-temperature motors, which can start and work stably at -40℃.

[0027] Quicklime is laid on the bottom plate 4 of the internal experimental area to make the intake air as dry as possible and prevent water vapor from frosting on the cooling surface.

Claims

1. A cryogenic droplet impact icing experimental stage, characterized in that: Including the thermal insulation outer frame, the inner low-temperature experimental area outer frame, and the self-insulating outer frame. An automated test bench and base plate, the heat-insulating outer frame, the inner low-temperature test area outer frame and the base plate constitute the test space, the automated test bench is located in the test space, the automated test bench includes a frame, a horizontal movable plate and a threaded screw, a perforated aluminum plate is installed at the bottom of the frame, the top of the threaded screw is connected to the top of the frame, the bottom of the threaded screw is located above the perforated aluminum plate and connected to the Z-axis low-temperature stepper motor, the middle of the threaded screw passes through the horizontal movable plate and cooperates with it, an X-axis slide rail and a Y-axis slide rail are installed on the horizontal movable plate, a slider is installed on the Y-axis slide rail, the Y-axis slide rail is located between the two X-axis slide rails and moves along it; The z-axis low-temperature stepper motor enables the horizontal movable plate to move in the z direction, and the y-axis low-temperature stepper motor enables the slider to move in the y direction on the slide rail. Through the cooperation of the two motors, the slider can move in the z and y directions. Under the premise of not damaging the internal low-temperature environment, multiple sets of experiments at different positions can be realized, which greatly reduces the error caused by human factors. The perforated aluminum plate adopts a multi-hole form and utilizes the principle of multi-hole rectification, so that the air intake at the bottom can flow into the experimental area along the circular holes around the perimeter, reducing the influence of the air intake airflow on the droplet movement in the experimental area. The cold airflow flows into the experimental area from the circular holes around the perimeter, forming a cold air layer inside, which is conducive to the control of the low-temperature environment. All the motors used in the experimental platform are low-temperature motors, which can start and work stably at -40℃. The automated test bench is equipped with a fixed optical rod. The top end of the fixed optical rod is fixed to the top end of the frame, the bottom end of the fixed optical rod is fixed to the bottom end of the frame, and the middle part of the fixed optical rod passes through a horizontal movable plate and limits its movement in the z-direction.

2. The cryogenic droplet impact icing experimental stage according to claim 1, characterized in that: A Y-axis cryogenic stepper motor is connected to a synchronous belt. The slider is pressed against the synchronous belt. The Y-axis cryogenic stepper motor controls the synchronous belt, thereby driving the slider to move along the Y-axis slide rail.

3. The cryogenic droplet impact icing experimental stage according to claim 1, characterized in that: A y-axis phase switch is installed at the mating point of the y-axis slide rail and the x-axis slide rail, and an x-axis phase switch is installed on the perforated aluminum plate.

4. The cryogenic droplet impact icing experimental stage according to claim 1, characterized in that: Optical glass is installed on the outer frame of the internal low-temperature experimental area.

5. The cryogenic droplet impact icing experimental stage according to claim 1, characterized in that: The top of the thermal insulation frame has a top air vent, the sides of the thermal insulation frame have side air vents, and the bottom plate has a bottom plate air inlet.

6. The cryogenic droplet impact icing experimental stage according to claim 1, characterized in that: Quicklime is laid on the base plate.

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