Description

Introduction

This constant temperature and humidity environment test chamber can simulate various temperature and humidity environments, and is suitable for testing electronics, electrical appliances, food, automobiles, rubber, plastics, metals and other products, and meets the reliability of GB/T2423, GJB150A1/4 in various harsh environments The parameters such as the stability of the sex machine will provide you with a basis for predicting and improving product quality and reliability.

Technical parameters

Note: The above indicators are tested and measured in a space within 1/6 of the inner wall of the box under the conditions of ambient temperature ≤25℃, normal pressure, no-load and no-load conditions;

Test chamber

1. Structure:

Integral structure, that is, the test cabinet, the refrigeration system, the heating/humidification system, the air conditioning system, the electrical control cabinet, and the refrigeration unit are integrated. The refrigeration unit is located at the bottom of the cabinet, and the electrical control part is placed on the side of the test cabinet. operating.

2. Cabinet:

a) In the air duct interlayer at one end of the studio, there are distributed heating/humidifier, refrigeration evaporator, blower motor, fan blades and other devices;

b) One cable threading hole is provided on the side of the test box, the size is ф50mm;

c) The test chamber studio is made of 1mm thick SUS304 stainless steel plate, and the box shell is made of 1mm thick high-quality stainless steel

d) The thermal insulation material adopts polyurethane foam, the thickness is 100mm, and the thermal insulation effect is good. The outer surface of the test box is free from frost and condensation.

e) The studio is equipped with two-layer stainless steel strip-shaped shelves with adjustable height;

f) The box body is equipped with a condensate drain.

3. Door: single door, the door seal adopts double-line silicone rubber sealing strip;

4. Observation and lighting devices:

A multi-layer hollow glass observation window is installed on the gate, the size is about 300×275mm, and a heating anti-frost device is installed. Install a (AC12V) 20W halogen lamp on the door of the test chamber.

Test chamber refrigeration system

1. Refrigeration principle:

The refrigeration part is the main part of the equipment that produces the cold source, which provides the required cold energy for the equipment's cooling, low temperature and constant temperature. According to the different test conditions of the equipment, the refrigeration system automatically opens to provide cold energy for the corresponding test process. To achieve the purpose of meeting the performance indicators of the equipment. The design of the refrigeration system applies energy adjustment technology. An effective treatment method can ensure that the energy consumption and cooling capacity of the refrigeration system can be adjusted under the normal operation of the refrigeration unit.

The operating cost and failure rate of the refrigeration system are reduced to a more economical state.

2. Refrigeration system components:

2.1. Compressor: The core of the refrigeration system is the compressor. In this plan, we use the French Taikang fully enclosed compressor to form a set of refrigeration system to ensure the cooling requirements of the studio. The refrigeration system consists of a high-pressure refrigeration cycle and a low-pressure refrigeration cycle. The connecting container is an evaporator, and the function of the evaporative condenser is

The low-pressure circulating evaporator is used as the high-pressure circulating condenser.

2.2. Oil separator: Whether the compressor has enough refrigerating oil will directly affect its life. If refrigerating oil enters the system, especially the heat exchangers, its performance will be greatly reduced. For this reason, the system needs to be equipped with oil separation According to our company’s previous use and experience of using imported oil separators, we are equipped with European and American “Aigao” ALCO oil separators for this equipment.

2.3. Condensing evaporator: The brazed plate heat exchanger produced by the world's most advanced ALfaLaval company in Sweden or swep company in Sweden is used. This heat exchanger is made of several pieces of herringbone corrugated corrosion-resistant stainless steel. A pair of adjacent stainless steel sheets have opposite corrugated directions, and the corrugated back lines intersect each other to form a large number of contact solder joints. Due to the complex contact cross network channels, the fluids on both sides form turbulent flow, which increases the heat transfer strength and at the same time The strong turbulence and smooth stainless steel surface make the inner surface of the brazed plate heat exchange channel not easy to scale. The use of this heat exchanger overcomes the disadvantages of the large size, poor heat exchange, and low efficiency of the previous domestic high and low temperature test box. , And the system resistance is also reduced to a minimum.

2.4. Vibration reduction: the compressor spring is used to reduce the vibration, and the refrigeration system is damped twice; the refrigeration system pipeline adopts the method of increasing R and elbow to avoid the deformation of the copper tube caused by the change of vibration and temperature, thereby causing the refrigeration system tube The road is broken.

2.5. Refrigeration evaporator: The evaporator is located in the interlayer of the air duct at one end of the test box, and it is forced to ventilate by a blower motor for rapid heat exchange.

2.6 Refrigeration auxiliary parts: All other auxiliary parts in the refrigeration system of this test chamber adopt imported components. Such as Italian "Castel" Castel solenoid valve, two-way hand valve, European and American "Aigo" ALCO oil separator, American "Sporlan" SPORLAN expansion valve, filter drier, Denmark "Danfoss" DANFOSS condensing pressure controller, etc. .

2.7. Energy adjustment measures: Under the premise of ensuring the main technical indicators of the test chamber, it is indispensable to adjust the cooling capacity of the system according to different cooling speeds and temperature ranges. For this reason, we have added its energy adjustment in addition to the aforementioned considerations. Measures, such as evaporating temperature adjustment, energy adjustment, and hot gas bypass energy adjustment to ensure that the main technical indicators are met and the energy consumption of the equipment is reduced.

2.8. Low-temperature pipeline: low-temperature pipeline adopts high-quality oxygen-free copper pipe, nitrogen-filled welding and special pipe routing technology, etc., high-quality oxygen-free copper pipe nitrogen-filled welding (traditional method uses ordinary copper pipe, direct welding method, easy to make copper Oxide is generated on the inner wall of the tube, which causes blockage of the refrigeration system, so that the temperature of the test box does not cool down or slow down), and the process is to ensure the quality of welding.

2.9. The cooling method of the refrigeration system: air cooling; (the cooling method can be selected by the user according to the situation. The air cooling requires a higher ambient temperature and the noise is too large. For the specific installation requirements, see the sixth part of this plan: installation and use conditions)

2.10. Refrigerant: R404a;

Heating system

Continuous PID adjustment, using SSR solid state relay as heating actuator, safe and reliable, with a separate over-temperature protection system.

Humidification/dehumidification/water system

1. Humidification method: stainless steel heating tube, external humidification;

2. Dehumidification method: freezing and dehumidification;

3. Waterway system: The equipment water supply system adopts a built-in approximately 20L stainless steel circulating water tank, which has low water consumption and stable circulation. The box is equipped with a drawer type water box, a circulating water tank liquid level display device to observe the water level, and a water shortage indicator. Accompanied by sound and light alarms to remind users to replenish equipment water in time. The humidification system pipeline is separated from the power supply, controller, and circuit board, which can prevent the circuit from being affected by the pipeline leakage and improve safety.

Air duct system

In order to ensure a higher uniformity index, the test box is equipped with an internal circulating air supply system; in the air duct at one end of the working room, heaters, refrigeration evaporators, fan blades and other devices are distributed; the air in the box is circulated by a fan. When the fan rotates at a high speed, the air in the working chamber is sucked into the air duct from the lower part, and blown out from the top of the duct after being heated and cooled. The air after heat exchange with the sample in the working chamber is sucked into the air duct and circulated repeatedly to achieve Temperature setting requirements.

Control System

Control system composition:

1 Temperature measurement: Pt100 platinum resistance;

2 Humidity measurement: Pt100 platinum resistance dry and wet bulb method;

3 Control device: Programmable temperature and humidity controller TEMI580. It can display setting parameters, time, heater, humidifier and other working status, and has the function of automatic test operation and PID parameter self-tuning. Only need to set the temperature to realize the automatic operation function of the refrigerator. The control system uses an intelligent control software system, which can automatically combine the working conditions of cooling, heating, humidification and other subsystems, so as to ensure high-precision control in the entire temperature and humidity range, and achieve the purpose of energy saving and consumption reduction. The perfect detection device can automatically perform detailed fault display and alarm. For example, when the test chamber is abnormal, the controller automatically displays the fault status. To

4 Screen display: set temperature and humidity; measured temperature and humidity; working status of heating, humidification, time, temperature and humidity curve, and various alarm indications.

5 Setting accuracy: Temperature: 0.1℃ Humidity: 0.1%R.H

6 Program capacity: 100, the total number of program segments is 1000, the maximum time of a single program step: 99 hours and 59 minutes; the program can be cycled, and the programs can be linked;

7 Operation mode: constant operation, program operation;

8 Other major low-voltage electrical components adopt well-known brand products: such as Schneider AC contactors, thermal overload relays, OMRON small intermediate relays, Delixi circuit breakers, Taiwan Fanyi water level float switches, etc.

If you customize more than six machines, you can integrate the machines into a comprehensive console:

Picture for reference:

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