Thermal shock tester

Thermal shock tester is combined by fan, heater, cooling system and controller. the accessories contain Shelf x2; lead hole $50mm x1 (optional); recorder (optional)

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Technical parameters of thermal shock tester

Model		MTS—050		MTS 100	MTS—150		MTS 200		MTS 300
Test chamber dimensions (WxHxD)		35×40×36		50×40×40	60×50×50		65×50×62		90×50×67
Overall dimensions (WxHxD)		135×175×137		140×180×137	150×185×150		155×185×165		180×185×170
Preheating temperature range		+60°C~+200°C
Precooling temperature range		-0°C~-78°C
Test temperature range		十60°C~+150°C
		-10°C~40°C; -10°C~65°C
Performance	Temperature fluctuation	±0.5°C
	Temperature conversion period	5min
	Preheating chamber heating time	°C	150	150		150		150	150
		min	30	40		40		40	40
	Precooling chamber cooling time	°C	-40, -55, -65	-40, -55, -65		-40, -55, -65		-40, -55, -65	-40, -55, -65
		min	70, 80, 90	70, 80, 90		70, 80, 90		70, 80, 90	70, 80, 90
Material	Casing	High-strength cold-rolled steel plate, with double sides powder painted and backed
	Inner wall	sus#304 stainless steel 2B panel
	Thermal insulating material	Glass fiber + polyurethane foam
System	Fan	Centrifugal fans of different powers and speeds are respectively used for the heating chamber, cooling chamber and test chamber
	Heater	Quality Ni-Cr heater
	Cooling system	France imported fully-enclosed or German imported semi-enclosed compressor; binary cascade refrigeration + finned evaporator + pure aluminum regenerator
	Controller	Japan imported original 7” TFT touch screen
Accessories		Shelf x2; lead hole $50mm x1 (optional); recorder (optional)
Protective devices		No-fuse breaker; compressor overpressure, over-temperature and overcurrent protection; fuse; water flow protection; phase order protection; oil pressure protection; pressure relief protection; low-pressure protection; pneumatic cylinder protection; extreme temperature protection
Electric power (kW)		AC3 380V, 50Hz
		20, 21, 22		20, 21, 22		22, 23, 25	28, 38, 45		30, 40, 50

Technologies

Construction

1. Hardware equipment of the company: 1 set of Germany imported laser machine, 1 set of Japan AMADA AIRS-255NT punching machine, over 10 sets of various German carbon dioxide and argon welding machines, and Autodrsk inventor 3D graphics software for 3D sheet metal disassembly drawing and virtual assembly design.

2. The casing is made with quality galvanized steel sheets and electrostatic powder coated and baked.

3. The inner chamber is made of imported sus#304 stainless steel and fully argon arc welded to prevent leakage or penetration of hot and humid air; the round corner design of inner tube of the inner chamber facilitates drainage of condensate water along side wall.

Thermal shock tester

2. The casing is made with quality galvanized steel sheets and electrostatic powder coated and baked.

Thermal shock tester

Cooling technology

1. Standardization

1.1 Quality steel pipe piping and welding standardization; system stability and reliability are guaranteed with standardized piping.

1.2 Italy imported pipe bending machine can realize overall steel pipe bending, thereby significantly reducing welding points and oxides produced in the pipes and enhancing system reliability.

2.Pipeline shock prevention and support

2.1 MENTEK has strict shock prevention and support requirements for copper pipeline for cooling. In view of pipeline shock prevention, round bends are added on the cooling pipeline and special nylon fixtures adopted to avoid pipe deformation and leakage due to operating vibration and temperature change and enhance reliability of the entire cooling system.

2.2 Oxidation-free welding

It is known to all that internal cleanliness of the cooling system pipeline directly affects efficiency and service life of the cooling system. MENTEK adopts standardized nitrogen filled welding procedure to prevent large volume of oxidization pollutants from being generated in the pipes during welding.

Control circuit

1. For the purpose of power distribution, the assembly drawings issued by the technical department are observed, components of internationally renowned brands such as Omron, Schneider, Germany phoenix terminals selected, and line code clearly marked.

Domestic time-honored brand (Pearl River Cable) is chosen to ensure cable quality; RV soft copper wires of at least 0.75m2 are used for the control circuit and wire diameter selected for major loads, such as motor and compressor, according to IEC slot wiring safe current standard. Cable ports of compressor junction box are sealed with adhesive to prevent defrosting from causing short-circuit terminals in the junction box.

All terminal retaining screws are tightened with standard torque to ensure reliable tightening and prevent such hazards as loose terminal and fire.

Cooling system

3D cooling system management drawing
Cooling system variable frequency control technology

Though the supply frequency of the variable frequency cooling system 50Hz is fixed, it can be changed with the converter to adjust compressor speed, constantly change cooling capacity and ensure compressor operating load matches actual load inside the test chamber (i.e. the higher the temperature inside the test body, the higher the compressor frequency and the cooling capacity; otherwise, the compressor frequency drops and the cooling capacity falls), thus significantly reducing unnecessary losses during operation and realizing energy conservation. Also, cooling system capacity can be enhanced by increasing compressor frequency when the test chamber starts, thus realizing rapid cooling.

The variable frequency cooling system of the test chamber can accurately control temperature in the chamber to realize constant internal temperature and low temperature fluctuation, and ensure stable suction and exhaust pressure of the cooling system and more stable and reliable compressor operation. Electronic expansion flow servo is adopted.

Other energy conservation technologies of cooling system

A) PID and PWM combined VRF technology (refrigerant flow control is achieved with the electronic expansion valve according to thermal conditions).

PID and PWM combined VRF technology (refrigerant flow control) realizes low-temperature energy-saving operation (refrigerant flow servo control by electronic expansion valve according to thermal conditions); in low-temperature working mode, the heater does not work, but PID and PWM jointly realize refrigerant flow and direction adjustment and cooling line, cooling bypass line and heating bypass line three-way flow control, thus achieving automatic constant temperature and energy consumption reduction by 30%. The technology is based on the Denmark Danfoss ETS electronic expansion valve and suitable for cooling control under various cooling capacity requirements, and it can achieve compressor cooling capacity control in the case of various cooling speed requirements.

B) Design of 2 sets of compressors of different capacities &automatic ON/OFF according to load conditions (the design is the compressor of larger capacity)

The cooling unit is fitted with a binary cascade cooling system comprising 1 semi-enclosed compressor and a fully-enclosed single-stage cooling system. Objectives of configuration: different compressor is started automatically according to load condition and cooling speed requirements in the cabinet to realize optimal matching of cooling capacity and compressor output power, thereby making compressors working within the optimal operating range and extending compressor life. More importantly, as compared with the traditional design of one set of larger capacity, it has excellent energy-saving results and can realize constant temperature pressure of over 30% (supported by VRF technology).

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