A test bench suitable for simulating low temperature environments

Abstract

The purpose of the present invention is to provide a test bench suitable for simulating low-temperature environments, comprising a test bench body, a top gas inlet disposed at the top of the test bench body, a bottom gas inlet disposed at the bottom of the test bench body, a gas outlet disposed on the side of the test bench body, a multi-hole structure disposed at the bottom of the test bench body, gas entering from the bottom gas inlet enters the internal space of the test bench body through the multi-hole structure, a gas flow channel disposed within the test bench body, and gas in the internal space of the test bench body flows from the gas flow channel to the gas outlet. The present invention can maintain the temperature of extreme temperatures (such as low temperatures) within the test bench at room temperature, and the temperature gradient is very small, which is closer to the real environment, providing an environment for many experiments that are difficult to achieve at room temperature.

Description

Technical Field

[0001] The present invention relates to an experimental device, in particular to a low-temperature experimental device. Background Art

[0002] With the continuous advancement of science and technology, researchers are no longer satisfied with experiments conducted at room temperature and are gradually shifting their focus to exploring harsh environments such as low temperatures. Under these circumstances, the freezing mechanism of droplets at low temperatures has gradually attracted the attention of researchers, and the low-temperature environment experimental platform is an important component of the entire droplet freezing process. To achieve the goal of a low-temperature environment, it is necessary to eliminate external environmental interference, thereby increasing the credibility of experimental results. Summary of the Invention

[0003] The object of the present invention is to provide a test bench suitable for simulating a low-temperature environment, which can create an internal stable airflow and an extreme temperature environment.

[0004] The object of the present invention is achieved like this:

[0005] 1. The present invention provides a test bench suitable for simulating a low-temperature environment, which is characterized by comprising a test bench body, a top gas inlet being provided at the top of the test bench body, a bottom gas inlet being provided at the bottom of the test bench body, a left gas outlet and a right gas outlet being symmetrically provided on the side of the test bench body, a multi-hole structure being provided at the bottom of the test bench body, gas entering from the bottom gas inlet enters the internal space of the test bench body through the multi-hole structure, a gas flow channel being provided inside the test bench body, and gas in the internal space of the test bench body flows from the gas flow channel to the left gas outlet and the right gas outlet.

[0006] The present invention may also include:

[0007] 1. The two sides and the upper part of the experimental table are double-layer organic glass plate structure with a thickness of 2mm.

[0008] 2. Insulation material is set in front of the experimental table body, and optical glass structure is embedded in the insulation material.

[0009] 3. The optical glass structure includes optical glass, a mounting frame, organic glass, and metal bolts. The optical glass is fixed on the mounting frame. A sealing pad is added between the optical glass and the insulation material. The mounting frame is fixed to the organic glass by metal bolts. Steel threaded holes are set at the position where the organic glass is connected to the metal bolts.

[0010] 4. The thickness of the plexiglass is 20mm.

[0011] 5. A door structure is set at the rear of the experimental bench body. The door structure is connected to the experimental bench body through a clamp structure. A hole for installing low-temperature protective gloves is opened on the door structure.

[0012] The advantages of the present invention are that it can maintain extreme temperatures (such as low temperatures) in the laboratory bench at room temperature, and the temperature gradient is very small, which is closer to the real environment and provides an environment for many experiments that are difficult to achieve at room temperature.

[0013] The lab bench itself is covered with a double-layer plexiglass cover, which insulates the interior. Furthermore, the temperature inside the bench is controlled by introducing gas through the bottom of the bench. The gas inlet at the bottom of the experimental area directly enters the experimental area through a porous structure, accelerating the temperature drop inside the bench. The internal temperature of the bench is maintained by controlling the on / off valve at the gas inlet at the bottom of the bench via a sensor in the experimental area. The gas inlet at the top of the bench is closed when the bench is cooling. When the temperature of the experimental area inside the bench reaches the required experimental temperature, the valve is opened to insulate the low-temperature environment inside the bench without affecting the internal experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the present invention (a schematic diagram of gas flow with the valve at gas inlet 1 open and the valve at gas inlet 4 closed);

[0015] Figure 2 is a side view of the present invention;

[0016] Figure 3 This is a front view of the present invention (a schematic diagram of gas flow with the valve at gas inlet 4 open and the valve at gas inlet 1 closed);

[0017] Figure 4 This is a schematic diagram of the back of the experimental bench;

[0018] Figure 5 Schematic diagram of the structure of optical glass embedded in thermal insulation material. DETAILED DESCRIPTION

[0019] The present invention will be described in more detail below with reference to the accompanying drawings:

[0020] Combine Figure 1-5 The present invention provides a test bench suitable for simulating low-temperature environments. The bench comprises a bottom 15 comprising a constant-temperature flow rate bottom gas inlet 1 with an on / off valve, a multi-hole structure 2, left and right gas outlets 3, and a constant-temperature flow rate top gas inlet 4 with an on / off valve. The left and right sides and top of the bench are constructed of double-layered 2mm-thick organic glass panels connected using thermal insulation material.

[0021] The side structure of the lab bench includes a single layer of insulation material 5 (20mm thick), an optical glass structure 6 nested within the insulation, and a double layer of insulation material with multiple openings to provide wiring for the instruments and equipment inside the bench. The right side of the bench features the door structure 8.

[0022] The back door structure of the laboratory bench, including the door structure 8, is made of thermal insulation material. The two holes 9 on the laboratory bench door are used to install cryogenic gloves, allowing direct access to the internal test bench. The clamp structure 10 is used to seal the door.

[0023] Figure 5 The structure of A is Figure 2 The specific structure of the optical glass 6 is nested in the insulation material, and the 20mm thick organic glass 11 is used. Since optical glass cannot be directly perforated, the optical glass 14 is fixed to the mounting frame 13. A sealing gasket is added between the optical glass 14 and the insulation material to ensure the airtightness of the entire laboratory table. This entire structure is fixed to the organic glass 11 with metal bolts 12, and the organic glass 11 is embedded in the steel threaded holes. This structure ensures that the metal bolts 12 are not directly exposed to the internal temperature of the laboratory table, preventing temperature leakage.

[0024] Add a filter at the connection between the laboratory table and the pipeline, and add desiccant to the filter to prevent frost on the internal water vapor of the laboratory table, which may cause damage to the experimental equipment. It also prevents frost on the optical glass from affecting the normal operation of the shooting equipment.

[0025] The insulation materials used to connect the various structures of the test bench and the internal sensors can withstand temperatures as low as minus 40 degrees Celsius.

[0026] The implementation steps of the present invention are as follows: open the door structure 8 at the back of the laboratory bench, install multiple temperature sensors on the laboratory bench frame inside the laboratory bench, install the peristaltic pump pipes, syringes and needles, and vibration structures into corresponding positions on the laboratory bench frame, install the water-cooled heat exchanger, semiconductor refrigeration surface, and hydrophobic surface into the bottom of the laboratory bench, and connect the corresponding lines and pipelines.

[0027] Test whether the peristaltic pump, vibration structure, water-cooled heat exchanger, and semiconductor refrigeration surface inside the test bench can operate normally.

[0028] Open the valve of the bottom gas inlet 1 of the experimental bench and temporarily close the valve of the top gas inlet to cool the inside of the experimental bench. The left gas outlet and the right gas outlet 3 are both equipped with flanges to connect to the external pipeline of the experimental bench. A filter is installed at the gas inlet 1 at the bottom of the experimental bench. A gas desiccant is placed on the filter to prevent the glass inside the experimental bench from frosting. Dry gas is transported to the interior of the experimental bench through the pipeline at a constant flow rate and temperature. The gas discharged on the left and right sides of the experimental bench is discharged through the left gas outlet and the right gas outlet 3. The exhaust gas pipeline is connected to the heat exchanger to achieve the effect of gas refrigeration.

[0029] When the temperature sensor in the test area inside the test bench detects that the temperature inside the test area reaches the desired target temperature value, the valve of the gas inlet 1 at the bottom of the test bench is closed, and at the same time, the valve of the gas inlet 4 at the top is opened to open the gas flow. Figure 3 As shown, the internal temperature of the test bench is kept low while the test area inside the test bench is not affected. At this time, the air flow effect inside the test bench is as follows: Figure 3 .

[0030] Then, the supercooled droplet impact freezing experiment was carried out inside the experimental platform, and the experimental phenomena were recorded through optical glass using a high-speed camera.

[0031] After the first set of experiments, Figure 4 Remove the anti-low-temperature gloves on the door 9 of the experimental table, replace the hydrophobic surface on the semiconductor refrigeration plate, and then repeat the above steps to lower the internal temperature of the experimental table to the temperature required for the experiment and continue with the next set of experiments.

[0032] After completing all experiments, turn off the external refrigeration equipment and wait for the temperature inside the laboratory bench to return to room temperature. Then open the door on the back of the laboratory bench, take out all instruments, and end the experiment.

Claims

1. A test bench suitable for simulating low temperature environments, characterized by: The experimental platform body comprises a top gas inlet on the top of the experimental platform body, a bottom gas inlet on the bottom of the experimental platform body, a left gas outlet and a right gas outlet symmetrically arranged on the side of the experimental platform body, a multi-hole structure on the bottom of the experimental platform body, gas entering from the bottom gas inlet enters the internal space of the experimental platform body through the multi-hole structure, a gas flow channel is provided inside the experimental platform body, and gas in the internal space of the experimental platform body flows from the gas flow channel to the left gas outlet and the right gas outlet; Insulation material is set in front of the experimental table body, and optical glass structure is embedded in the insulation material; The optical glass structure includes optical glass, a mounting frame, organic glass, and metal bolts. The optical glass is fixed to the mounting frame, a sealing pad is added between the optical glass and the thermal insulation material, the mounting frame is fixed to the organic glass by metal bolts, and a steel threaded hole is set at the position where the organic glass and the metal bolts are connected; The thickness of the organic glass is 20 mm; The implementation steps include: opening the valve at the bottom gas inlet of the laboratory bench and temporarily closing the valve at the top gas inlet to cool the inside of the laboratory bench; installing flanges at the left and right gas outlets to connect to the external pipeline of the laboratory bench; installing a filter at the gas inlet at the bottom of the laboratory bench; placing a gas desiccant on the filter to prevent frosting on the glass inside the laboratory bench; delivering dry gas to the interior of the laboratory bench at a constant flow rate and temperature through the pipeline; and discharging gas on the left and right sides of the laboratory bench through the left and right gas outlets. Connecting the exhaust gas pipeline to the heat exchanger can achieve the effect of gas refrigeration; When the temperature sensor in the test area inside the test bench detects that the temperature inside the test area has reached the desired target temperature, the valve at the gas inlet at the bottom of the test bench is controlled to close, and at the same time, the valve at the gas inlet at the top is opened, so as to maintain the temperature inside the test bench at a low level without affecting the test area inside the test bench; Then, the supercooled droplet impact freezing experiment was carried out inside the experimental platform, and the experimental phenomena were recorded through optical glass using a high-speed camera.

2. The test bench suitable for low temperature environment simulation according to claim 1, characterized in that: The sides and top of the experimental table are double-layer organic glass plate structure with a thickness of 2mm.

3. The test bench suitable for low temperature environment simulation according to claim 1, characterized in that: A door structure is set at the rear of the experimental bench body, and the door structure is connected to the experimental bench body through a clamp structure. A hole for installing low-temperature protective gloves is opened on the door structure.

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