Instrument and technical characteristics of three-zone Thermal Shock test Chamber
- With the disk USB recording function, you do not need a logger.
- Refrigerant servo valve flow algorithm control. 30% power saving
- High temperature and high humidity test to prevent condensation, dripping technology industry-leading
- Low-temperature working conditions, the heater does not participate in the work. The refrigerant flow rate and flow direction of the refrigeration unit are controlled by PWM technology, and the refrigeration pipe, cold by-pass pipe and hot by-pass pipe are adjusted in three directions to realize the automatic constant temperature of the working room. This method can reduce energy consumption by 40% under low-temperature working conditions.
- Temperature synchronization slope control (IEC 68-2-56,68-2-30), no dripping, no condensation and condensation.
- Refrigeration Advantages: traditional equipment low temperature control mode: Ø refrigeration compressor start-stop control temperature (temperature fluctuations, seriously affect the life of the compressor.
has been eliminated technology) Ø refrigeration compressor constant operation + heating PID control (resulting in cooling capacity and heating offset to achieve dynamic temperature balance)
(waste a lot of electricity) – new PWM cold control technology to achieve low-temperature energy-saving operation: new PWM cold control technology to achieve low-temperature energy-saving operation.
Control mode of temperature shock test chamber:
The use of low and high temperature storage and thermal energy storage tank, according to the action required to open the DAMPER, the storage tank of hot and cold energy into the test tank to achieve rapid temperature shock effect, balance temperature control system (BTC) + special design of the air supply circulation system, dynamic P.I.D. way to control the SSR, so that the system of heating equal to the amount of heat loss, so it can be used for a long time and stable.
thermal shock chamber specification
Technical parameters
| Product name | Cold and thermal shock test chamber | |
| Product Model | JS-TC-80A-40 | |
| Test Method | Pneumatic dampers switch 3 temperature zones, air-cooled | |
| Volume and Size | Nominal content area | 80L |
| Inner box size(W X D X Hcm) | 40X50X40 | |
| Outer box size(W X D X Hcm) | 155x170x185 | |
Specimen limit
This test equipment prohibits testing and storage in these conditions:
- Flammable, explosive and volatile substance specimens
- Corrosive substance specimens
- Biological specimens
- Specimens of strong electromagnetic emission sources
- Radioactive material specimens
- Highly toxic substances
- Specimens that may produce highly toxic substances during testing or storage
Performance indicators
Test Environment Conditions
Ambient temperature of +28℃, relative humidity ≤ 85%, no specimen in the test chamber (except as otherwise specified)
Test Method
GB/T 5170.2-1996 temperature test equipment
High Temperature Chamber
(1) preheating upper temperature: +200 ℃
(2)warming time: room temperature → +150 ℃ ≤ 40min
Note: The temperature rise time is the performance of the high-temperature box when operating alone
Cryogenic Chamber
(1) Pre-cooling lower limit temperature: -55℃
(2) cooling time: room temperature → -60 ℃ ≤ 60min
Note: The cooling time is the performance of the cryostat when operating alone
Test area
(1)Shock temperature -40℃～+150℃
(2)Temperature deviation: ±2.0℃ (at constant, no load)
(3) Temperature fluctuation: ≤±0.5℃
(4) Temperature changeover time:3~5min
(5) Damper switching time <5sec
(6) Impact dwell time 15 min or more
Recovery Conditions
Specimen: (evenly distributed) Sensor position: (measurement position) air outlet
| High temperature exposure | Specimen weight | Low temperature exposure time |
|---|---|---|
| +150℃：30min | ≤10KG evenly distributed | -40℃：30min |
Meet the Test Standards
- GB/T 2423.1-2001 Test A: Low temperature test method
- GB/T 2423.2-2001 Test B: High temperature test method
- GB/T 2423.22-2002 Test N：Temperature change test method Test Na
- GJB 150.3-1986 High-temperature test
- GJB 150.4-1986 Low-temperature test
- GJB 150.5-1986 temperature shock test
Structural characteristics
Insulation Enclosure Structure
(1) cold-rolled steel plate electrostatic double-sided spraying, 1.5MM (2MM in the four-legged part)
(2)Inner wall material: stainless steel plate SUS304, 2.0MM thickness
(3) box insulation material: rigid polyurethane foam + glass fiber
(4) Door insulation material: glass fiber
Test Area Door
Single door, hinge on the right (when facing the box)
Heater
(1) High temperature box: Nickel-chromium alloy electric heater
(2) low temperature box: nickel-chromium alloy electric heating wire type heater
(3) heater control mode: non-contact iso-periodic pulse width adjustment, SSR (solid state relay)
Circulation Fan
(1) High temperature exposure: centrifugal type
(2) Low temperature exposure: centrifugal
(3) room temperature exposure: centrifugal type
Drive Unit
Dampers and test area door locking device (pneumatic drive)
Cylinder: ● For low temperature / high temperature exposure
Main Structure
(1)Pre-cooling and cold storage area
(2)Preheating and heating storage area
(3)testing area for testing products
Three parts of the main structure, flap type control; box weight ≥ 200 Kg
Sealing Device
Original imported high quality silicone sealing strip
Inner Shelf of Test Chamber
2 adjustable grill shelves with a single load of not less than 30 Kg
Machine Caster
The use of universal multi-functional pulley to move to adjust the placement and strong bolt fixed position
Alarm Indicator(optional)
One alarm indicator One tricolor light
Refrigeration system
Refrigeration Method
Air-cooled, mechanical compression binary stack refrigeration method
Compressor
Terracon France
Refrigerant
High-temperature machine: R404A (Ozone depletion index is 0)
Low-temperature machine: R23 (Ozone depletion index is 0)
Heat Exchanger
Imported all-welded high-efficiency ST plate heat exchanger is used, not the traditional low-end half-welded or disassembled exchanger.
Condenser
Air-cooled high efficiency finned condenser.
Evaporator
High efficiency multi-sectional evaporator with hydrophilic membrane fins (fin thickened type)
Throttling Device
Thermal expansion valve, capillary tube
Chiller Control Mode
The control system automatically adjusts the operation of the refrigerator according to the test conditions.
With refrigerant servo valve flow rate algorithm control
Basic Circuit
(1) Compressor return gas cooling circuit
(2)Energy regulating circuit
(3)Evaporative pressure regulating valve
(4)Servo control snow circuit
(5)Water flow regulating valve
Electrical control system
Controller
Using Taiwan’s imported brand industrial microcomputer controller, anti-integral saturation PID, BTC balanced temperature control mode (thermal compensation function) + DCC intelligent cooling control + DEC intelligent electrical control (temperature test alternating test program settings) softwares can be developed by DGBLL company according to user needs.
Display System
TFT7 inch high resolution true color LCD touch screen interface (resolution 850*680) in English and Chinese
Operation Mode
(1)Program mode
(2)Constant value mode
| Programmable touch screen | High precision resistive touch screen |
| Force input mode | 3 groups of inputs, support PT100, thermocouple T, K, E, etc. |
| Output mode | PID+SSR/SCR automatic forward and reverse bi-directional synchronous output. |
| Accuracy | 0.1 high precision sampling, temperature: 0.1℃ |
Built-in
(1) Large storage space, 24 hours of continuous power on can save 3 months of data
(2) sampling for 1M, can replace the computer storage
Communication Function
Self-USB interface can download historical curves, historical data – can replace the recorder to support RS485, LAN (network port), GPRS (cell phone) and other ways of communication, convenient remote monitoring, data acquisition.
USB function: USB2.0, can record and download test operation data
Defrost Setting
(1)Automatic setting times
(2)Manual setting times
(3)Defrost frequency meet: 200 cycle/time (in the case of -40℃~150℃) (can be customized upon request)
Fault Alarm Function
Chinese and English humanized prompting fault causes and troubleshooting methods, can monitor 16 groups of fault alarm and output at the same time
Setting Function
Automatic or manual energy storage compensation, pre-heat treatment before impact, pre-cooling and time-keeping, and separate cold or hot flush can be set
Online Function
Provide strong communication environment and support 254 multi-branch structure
Four Ways to End
(1)Stop after room temperature shock
(2)Stop after frost
(3)Ready state, direct stop
(4)Select after restoration of power: “continue” “re” “stop” setting selection after power failure and restoration of power
Program Storage Capacity
(1)Up to 127 programs, ultra-long operation
(2)999 hours per segment, maximum 32000 cycles
(3)Each command can 9999 )times time: 0～99 hours and 59 minutes
The graphical curve can be displayed in real time when the program is executed, displaying the following contents: temperature setting (SV) actual (PV) value, execution program cycle, program curve execution function, segment running time, segment number time, operation time, fault time, remaining time. The display includes: the actual (PV) value of the temperature setting (SV), the execution period of the program, the execution function of the program curve, the segment running time, the segment number time, the running time, the remaining time, the fault state and the fault time.
Smart Screensaver Function
(1)With screen protector
(2)Screen protection time can be set
(3)Password authority setting for machine operation
Working Principle
Safety protection device
Refrigeration System
(1) Compressor overpressure protection
(2) Compressor electric overheating
(3) Compressor motor overcurrent
Electrical System
(1)Adjustable over-temperature protection
(2) test space temperature fuse
(3)Air conditioning channel overtemperature
(4)Leakage short circuit protector
(5)Total power phase sequence protection
(6)Overload circuit break protection
(7)Load short circuit protection
Standard distribution
(1) power cable five lines (four-core cable + protection ground wire) about 2.5 meters long cable 1
(2) test hole a 50
(3) 2 layers of laminate for placing the product
(4) a product manual
(5) a factory test report
(6) a third-party test report (optional cost customer pays)
Packaging and transportation
(1) The test box is integral, the whole transport
(2)The maximum transport size (without packaging) is shown in the parameter outer box size
Conditions of use
Installation Site
(1) Installation site, the ground is flat
(2) Good ventilation, no strong vibration around the equipment
(3) No strong electromagnetic field around the equipment
(4) no flammable, explosive, corrosive substances and dust around the equipment
(5) near the equipment with drainage floor drain
(6) Ground bearing capacity of the site: not less than 1500kg/m2
(7) test box around the four left not less than 800mm, the top of not less than 800mm use and maintenance space
Environmental Conditions
(1)Temperature: 5℃～35℃
(2)Relative humidity: ≤85%
Air Source (Compressed Air)
(1) Air pressure: 86 kPa ~ 106 kPa
(2) Air source (compressed air) pressure: (4 ~ 7) kg/cm2
Connection pipe diameter: φ8mm
Power Supply Conditions Power Supply
(1) AC380V 50Hz three-phase four-wire + protection ground
(2) Allowable voltage fluctuation range: AC (380±38)V
(3) Frequency allowable fluctuation range: (50±0.5) Hz
(4) Protection earth ground resistance less than 4Ω;
(5) TN-S mode power supply or TT mode power supply
The user is required to configure an air or power switch of corresponding capacity for the equipment at the installation site, and this switch must be independent for the use of this equipment
Equipment Power About (kw)
20KW
Requirements for Storage Environment
(1)When the equipment is not working, the temperature of the environment should be kept within 0℃～+45℃
(2)When the ambient temperature is lower than 0℃, the water stored in the equipment should be discharged cleanly so that the water in the pipeline will not freeze and rise and damage the pipeline
Machine Weight About (kg)
800KG
Machine and equipment delivery time
Spot goods, equipment and materials all arrive at the buyer’s site, and installation, commissioning is over, acceptance and delivery to the buyer’s use (we are not responsible for lifting, removing doors or walls)
Equipment main accessories
Electrical Components
| Product Name | Brands | Place of origin | Pictures | Description Introduction |
|---|---|---|---|---|
| AC Contactors | LG | Korea |  | Genuine original quality and price better than the industry’s choice of brands |
| Thermal Relays | LG | Korea |  | Genuine original quality and price is better than the industry’s chosen brands |
| Circuit Breaker | CHINT | China |  | Designed to last 15 years or more |
| Phase Sequence Relays | CHINT | China |  | Design life of 15 years or more |
| Solid State Relays | Yaming | Taiwan |  | Genuine original quality and price is better than the brand chosen by the industry (currently there is no anti-product) |
| Over Temperature Protector | Rainbow | Korea Rainbow |  | Genuine original quality and price is better than the brand chosen by the industry (currently there is no anti-product) |
| Relays | OMRON | Japan OMRON |  | Genuine original quality and price is better than the brand chosen by the industry |
| Timer | Songling | Taiwan Songling |  | Genuine original quality and price is better than the industry’s chosen brand |
| Cable | Chengtiantai | Shenzhen |  | Genuine well-known trademark brand is better than the industry’s choice of brands |
| Casters | Chengtiantai | Shenzhen |  | Genuine well-known trademark brands are better than the brands chosen by the industry |
Air Supply Temperature Measurement System
| Product Name | Brands | Place of origin | Pictures | Description Introduction |
|---|---|---|---|---|
| Electric Motor | Yizheng | Taiwan |  | Customized by high quality manufacturers Genuine original life can be continuous working time quality and price is better than the industry’s selected products |
| Wind turbine | Taiqiang | Dongguan |  | Customized by high quality manufacturers All aluminum alloy 2.0 thick better than the industry |
| Sensor | OMEGA | USA |  | Genuine original quality and price is better than the industry’s choice of brand PT100 high accuracy |
| Heating wire | Yongli | Taiwan |  | All titanium material 5.0 thicker than the industry failure is almost zero Customized by high quality manufacturers |
Refrigeration Design System Core Configurations
Compressor
Brand: Taikang, France
Genuine original quality and price better than the industry’s chosen brands
Condenser
Brands: Taiwan Yongqiang
Quality and price better than the industry’s choice of brands, the industry’s best brands.
Evaporator
Brands: Taiwan Yongqiang
Quality and price better than the industry’s choice of brands, the industry’s best brands.
Fans
Brands: Germany Mal
Quality and price better than the industry’s choice of brands, the industry’s best brands.
Compressor Pressure Protection
Brands: Danfoss Denmark Import
Genuine original quality and price is better than the industry’s choice of brands.
Water Pressure Protection
Brands: Danfoss Denmark Import
Genuine original quality and price is better than the industry’s choice of brands.
Heat Exchangers
Brands:Jiangsu Yuanzhuo
Genuine original quality and price is better than the industry’s choice of brands
Drying Filter
Brands: Danfoss Denmark Import
Genuine original quality and price is better than the brand chosen by the industry
Pressure Protection Switch
Brands: Danfoss Denmark Import
Genuine original quality and price is better than the industry’s choice of brands.
Oil Separator
Brands: USA Emerson
Genuine original quality and price is better than the industry’s choice of brands.
Refrigerant Oil
Brands: U.S. Ice Bear
Genuine original quality and price is better than the industry’s choice of brands.
Solenoid Valve
Brands: Japan Heron Palace
Genuine original quality and price is better than the brand chosen by the industry.
Solenoid Valve
Brands: Italy Casto
Genuine original quality and price is better than the brand chosen by the industry.
Solenoid Valve
Brands: Sporlan, USA
Genuine original quality and price is better than the brand chosen by the industry.
Refrigerant R23+404A
Brands: Honeywell, USA
Genuine original quality and price is better than the brand chosen by the industry.
Copper Tube
Brands: Australia KEMBLA
Genuine original quality and price is better than the brand chosen by the industry (foreign investment in China Hengkang manufacturing).
Copper Pipe Elbow
Brands: Australia KEMBLA
Genuine original quality and price is better than the brand chosen by the industry (made by foreign investors in China Hengkang).
Copper Pipe Straight Through
Brands: Australia KEMBLA
Genuine original quality and price is better than the brand chosen by the industry (made by foreign investors in China Hengkang).
Copper Tube Nano
Brands: Australia KEMBLA
Genuine original quality and price is better than the brand chosen by the industry (made by foreign investors in China Hengkang).
Shock-Absorbing Hose
Place of Origin: United States
Quality and price better than the industry’s choice of brands, the industry’s best products.
FAQ
What are the differences between temperature cycling test and thermal shock test?
- Temperature conversion rate is different. Cold and thermal shock test of the temperature conversion rate is very fast, the temperature is a sudden change in the process, such as macro-zhan technology of the two box basket type cold and thermal shock test chamber temperature conversion time ≤ 10s, while the general temperature cycle test is not the pursuit of sudden change of the temperature conversion, temperature rise and fall in the temperature rate of 1 ~ 3 ℃ / min or so.
- Cold and heat shock test without humidity test, and temperature cycle test can choose to do humidity test.
- The difference in stress loading mechanisms is the difference between temperature cycling tests and thermal shock tests. Thermal shock testing detects sample failure due to fatigue damage and creep, while temperature cycling detects sample failure due to shear fatigue.
- Cold and thermal shock test allows the use of two tank type test equipment, temperature cycling test requires the use of a single tank type test equipment.
What are the main effects of the thermal shock environment on the product?
- The elasticity of rubber and other flexible materials is reduced and rupture occurs;
- Breakage or cracking is caused by increasing the brittleness of plastics and metals;
- Changes in the electrical parameters of electronic components, affecting the electrical properties of the product;
- Icing or frosting causing structural damage to the product or moisture;
- Increased viscosity of lubricants, reduced flow capacity and reduced lubrication;
- Shrinkage of materials causing changes in mechanical structure.
How to maintain the thermal shock tester?
- When conducting a test, take out the test object or open or close the door without the object touching the rubber edge on the door of the test chamber. Once the rubber edge is damaged, the service life of the test chamber will be affected.
- In order to avoid a lot of dust entering the equipment, reducing the performance of the test chamber and accidents. Care should be taken to keep the bottom of the test chamber and the surrounding ground clean.
- The refrigeration system is the core of the machine, please inspect all the copper tubes once every six months for leakage, and notify the company or deal with it directly if there is any oil leakage from the couplings and welded ports.
- The high current contact of the switchboard, the distribution room at least once a year to clean the maintenance above, the contact of the loose will make the whole equipment is in a dangerous working condition, the light is burned components, the heavy is fire, alarm, personal injury is very dangerous. Clean the dust inside the room with a hoover.
- Two over-temperature protector set value in the switchboard box, please do not just debug, the factory has been adjusted, this protection switch is to protect the heating tube empty burning and alarm. Set point = temperature set point +20℃～30℃.
- When the test product time arrives to take the product, must be in the state of shutdown and the staff must wear a good dry, anti-electricity, temperature-resistant gloves to pick up and put the product.
- Clean and maintain the inside and outside of the box.
- The machine should be cleaned of internal impurities before operation.
- Once a year the above distribution room should be cleaned, to remove dust from the interior it is recommended to use a vacuum cleaner. The exterior of the above cabinets should also be cleaned once a year, cleaning is done by wiping with soapy water.
What are the methods of thermal shock testing?
- Cyclic test method
- Rapid temperature change test
- Temperature shock test
- Programmed temperature rise and fall
- Comprehensive temperature test
In summary, there are a variety of ways to choose the cold thermal shock test, electronic product manufacturers can choose according to their own needs for their own way to test. At the same time, in order to ensure the accuracy and reliability of the thermal shock test, manufacturers also need to pay attention to the selection of equipment, equipment calibration, the scientific nature of the test procedure and other factors.
What factors affect test results?
As the impact test is carried out under the action of dynamic force, so there are many factors affecting the correctness and dispersion of the test results, these influencing factors are mainly the following aspects.
1. The material itself material factors
The chemical composition of the sample itself, metallurgical microstructure, product particle size and whether it contains segregation, white spots, cracks and non-metallic inclusions exceeding the standard and other metallurgical defects or overheating, overcooking, tempering cellular and other thermal defects have an impact on the impact properties of the sample. Thus, the dispersion of the impact test results is greater.
2. Sample processing and preparation factors
(1) Sampling parts and direction along the rolling direction sampling, perpendicular to the rolling direction of notch, impact value is higher: perpendicular to the rolling direction sampling, along the rolling direction of notch, impact value is lower.
(2) Notch processing quality impact specimen notch size and notch root surface quality will affect the impact performance of the specimen, notch root roughness and low notch root and notch axis parallel to the notch machining traces will make the specimen impact performance decreased significantly, impact specimen notch size determines the degree of concentration of stress near the notch, which affects the notch impact of the specimen absorbed energy.
(3) Specimen size to increase the width or height of the specimen will increase the volume of plastic deformation of the metal in the impact, resulting in an increase in the impact absorbed energy of the specimen.
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