New (one box, three uses) high and low temperature thermal shock test chamber

WDCJ-162-New (one box, three uses) high and low temperature thermal shock test chamberIntroduction:

Suitable for adaptability testing of electrical, electronic, rubber materials, and other equipment under rapidly changing ambient temperatures. Through this equipment test, product reliability can be improved and quality control can be carried out.

1WDCJ-162-New (one box, three uses) high and low temperature thermal shock test chamberMain technical indicators：

2、 Box structure:
1. Box shell material: A3 steel plate spray painted on the outer surface;
2. Material of the inner liner of the box: SUS304 stainless steel plate;
3. Observation window: Install a rectangular multi-layer insulated glass observation window (300 × 200mm) on the high-temperature box. Install lighting fixtures on the observation window;
4. Insulation material: Ultra fine glass fiber cotton connects the inner chamber, outer shell, high temperature chamber, and low temperature chamber into a whole;
5. Sample rack movement method: The sample rack relies on a linear reciprocating drive system installed at the bottom of the box to move up and down;

3、 Overview of Manufacturing Solutions

The three box temperature shock test chamber is an integral structure consisting of four main parts: the box body, low-temperature refrigeration system, electronic control system, and valve ventilation system; The studio is located at the front of the box, the pre cooling chamber is located at the lower front of the box, the preheating chamber is located at the upper rear of the box, the electronic control system is located on the right side of the box, and the refrigeration system is located at the lower rear.

1. Box structure

1.1 Box Material: The testing chamber workshop is made of SUS304 # imported stainless steel plate; The shell is processed and formed from cold-rolled steel plates, and the surface is treated with acid pickling, phosphating, and paint spraying;

1.2 Load bearing capacity: The workshop can bear 30kg, and the sample remains stationary during the test;

1.3 Test lead hole: with a diameter of 50mm, it is mainly used to introduce sensor wires, detection cables, and other types of leads into the box, making it convenient for users to conduct power on testing of the product;

1.4 Observation Window: A multi-layer insulated glass observation window is installed on the front door of the box, and an EC film heating defrosting device is installed on the inside of the observation window;

1.5 Lighting Device: A switchable, high and low temperature resistant, and moisture-proof lighting fixture is installed at the top of the studio for easy observation of the working conditions inside the test chamber;

1.6 Gate: Single door, with the same inner layer material as the studio, double-layer sealing structure, and high and low temperature resistant silicone rubber sealing strip.

2. Refrigeration system

Principle of refrigeration system:

The refrigeration section is the main part of the equipment that generates a cold source, providing the required cooling capacity for equipment cooling, low temperature, and constant temperature. Depending on the testing status of the equipment, the refrigeration system automatically starts to provide cooling capacity for the corresponding testing process, thereby achieving the goal of meeting the performance indicators of the equipment. The mechanical refrigeration of this device adopts steam compression refrigeration, and its basic principle of refrigeration is as follows:

Steam compression refrigeration is a widely used refrigeration method and also the most commonly used refrigeration method in environmental testing equipment. Its principle is to use the latent heat of evaporation of liquids such as Freon to absorb heat from the cooled object and achieve refrigeration. The liquid entering the evaporator through expansion valve throttling absorbs latent heat of evaporation from surrounding objects and evaporates. After evaporation, it becomes a low-temperature and low-pressure gas that is sucked in by the refrigeration compressor. After compression by the compressor, it becomes a high-temperature and high-pressure gas that enters the water-cooled or air-cooled condenser, where it is cooled into high-pressure liquid, and then enters the evaporator through the expansion valve. This cycle repeats, absorbing heat from low temperatures to achieve refrigeration, and then releasing heat from high temperatures.

2.1 Refrigeration unit:

French Taikang compressor unit; The refrigeration unit is welded and assembled by professional manufacturers (outsourced) to ensure the good performance of the refrigeration system, especially to prevent leakage and failure of the refrigeration system.

2.2 Cooling method:

Single machine cooling, the control system automatically adjusts the cooling capacity. During the cooling stage, the compressor is fully powered for cooling. When the temperature is low and constant, the heating system can be used only for partial cooling to save energy and reduce operating costs.

2.3 Oil separator:

Whether the compressor has sufficient refrigerant oil will directly affect its lifespan; If refrigeration oil seeps into the refrigeration system, especially into each heat exchanger, its performance will be greatly reduced; Therefore, an oil separator needs to be installed in the system, and the German oil separator has better performance.

2.4 Refrigeration evaporator and condenser:

Adopting evaporator and condenser matched with compressor; The evaporator is located in the interlayer of the air duct at one end of the pre cooling chamber of the test box, and is forcibly ventilated by a blower motor for rapid heat exchange; The condenser is located inside the refrigeration unit.

2.5 Refrigeration auxiliary components:

Other auxiliary components in the refrigeration system, such as solenoid valves and filters, are all imported to ensure quality.

2.6 Energy regulation measures:

On the premise of ensuring the main technical indicators of the test chamber, it is necessary to adjust the cooling capacity of the system according to different cooling rates and temperature ranges. Therefore, in addition to the corresponding energy adjustment measures considered above, such as evaporation temperature adjustment, energy adjustment, and hot gas bypass energy adjustment, we can ensure that the energy consumption of the equipment is reduced while meeting the main technical indicators. At any low-temperature constant temperature point, there is no need for heating balance.

2.7 Low temperature pipeline:

Low temperature pipelines use high-quality oxygen free copper pipes, nitrogen filled welding processes to ensure welding quality, and specialized pipe routing techniques.

2.8 Condensed water collection tray:

A condensate drain pan is installed at the bottom of the refrigeration system and discharged outside the box.

2.9 Cooling method: Air cooling.

2.10 Refrigerant: Environmentally friendly refrigerant R404A is used.

3. Electrical control system

3.1 Control device:

The control part of the test chamber adopts a 7.0-inch EasyColor LCD touch control screen, equipped with relevant interfaces and software, which can be connected to a regular computer for communication. The control system is equipped with input and output modules and corresponding control modules, with two analog inputs to detect the temperature of the preheating chamber and the pre cooling chamber, respectively; Two control outputs: control the temperature of the preheating chamber and pre cooling chamber; More than ten switch outputs are used to control the timing and lighting of the compressor; More than ten switch inputs are used to monitor various alarm signals, such as over temperature, over pressure, phase loss, phase misalignment, water shortage, compressor oil shortage, etc. The alarm at any moment is recorded, and the corresponding reasons and solutions can be displayed on the screen for analysis. Using a program controller as the main control system of the machine, it can automatically combine subsystems such as heating, cooling, and ventilation valves to achieve intelligent control of the entire process.

3.2 Function Description:

3.2.1 It has the ability to set temperature, conversion time, dwell time, and conversion speed arbitrarily;

3.2.2 has the characteristics of simple operation, easy to learn and understand, with a fully Chinese friendly human-machine interface, reducing the requirements for operators;

3.2.3 Can display: set temperature of each box, measured temperature, measured relative humidity, running time, remaining time, program number and section number, heating, cooling and other working status and real-time clock, and can display programmed temperature curve and real-time working curve segments;

3.2.4 Up to 20 programs can be set, with a maximum of 200 segments per program;

3.2.5 Configure a micro printer that can print test data;

3.2.6 Equipped with a standard RS232 computer communication interface, a transmission cable with RS232/485 conversion function, and an operating system CD. Realize remote test data collection, programming control and other functions through the upper computer and Internet;

3.2.7 Sensor: Pt100 platinum resistor;

3.2.8 Setting accuracy: temperature 0.1 ℃, time 1 minute;

3.2.9 Multiple protection functions such as studio overheating, compressor overheating, overpressure, overload, power phase loss, water interruption, phase loss, phase sequence error, etc; When the equipment malfunctions, the electronic control system automatically shuts down the entire machine and has corresponding sound and light alarms to protect the equipment from damage, ensuring safe and reliable operation of the test box.

3.2.10 It has a multifunctional box and can be used as a low-temperature test box, a high-temperature test box, and a temperature shock box respectively.

3.3 Pre cooling chamber control mode:

Forced circulation ventilation, using selected energy regulation methods to maintain constant temperature, in the case of continuous operation of the refrigeration system, the control system automatically calculates the output of the refrigeration output (cold end output) through PID calculation based on the set temperature point, controls the flow rate of refrigerant entering the evaporator, and achieves a dynamic balance at low temperatures. The advantage of this method is that the heating system can be left on during low-temperature testing, overcoming the disadvantage of high energy consumption of the original heat balance method, greatly improving its economic practicality, and greatly reducing the user's usage cost (electricity consumption is about 50% of that of the heat balance method). The heating system is mainly used for defrosting after high-temperature and low-temperature tests.

3.4 Impact test type: Users can choose to run the program themselves.

4. Valve ventilation system

Adopting pneumatic valve drive method and equipped with one set of air compressor, the characteristics are as follows:

4.1 Large opening valve to ensure rapid ventilation in the workspace, thereby ensuring that the recovery time meets the requirements;

4.2 Fully automatic valve control system, which can accurately open/close according to working conditions;

4.3 Good sealing device to ensure that cold and hot air do not leak;

4.4 Good insulation design ensures independent temperature control between each box.

5. Air conditioning system

5.1 Adjustment method: forced air convection, BTC balance temperature control;

5.2 Heating method: Nickel chromium alloy electric heater, contactless control;

5.3 Circulating fan: Centrifugal multi wing stainless steel long shaft fan with vertical air duct structure.

5、 Installation and usage conditions

1. Power system:

Power supply voltage: three-phase 380V ± 10%; 50Hz；

Frequency and error: 50 ± 0.5Hz;

Voltage and error: AC 380 ± 10% V;

Total installed power: approximately 18.0Kw;

Power main switch: Due to the electrical characteristics of the knife switch and power socket, using it as the power switch for this equipment may cause hidden dangers. It is required to use an aerodynamic switch with leakage protection.

2．Spatial location:

For the convenience of ventilation, operation, and maintenance, please place the equipment in the following required spatial locations:

There should be at least one person passing through the space around the equipment, which is ≥ 600mm;

There should be a space at the opening and closing of the equipment box door that can be opened and closed normally, and there should be no other objects in front of the equipment box door to avoid being burned by the hot air emitted during the opening of the equipment box door;

The drainage pipes for defrosting inside the equipment box and frosting during compressor operation lead out water, so there should be floor drains for water supply and drainage near the equipment.

3．Environmental conditions around the equipment:

Temperature range: 5-28 ℃;

Humidity range: ≤ 85% RH;

Atmospheric pressure: 86-106KPa;

Ground requirements: flat and well ventilated