THJDY-03EOne machine, two storage cold storage training device

(Multi evaporation refrigeration teaching test bench)

Product Introduction

THJYD-03E One Machine Two Warehouse Training Device is specifically designed for practical training and experimentation in the refrigeration major of vocational and technical colleges. One machine and two warehouses refer to using one refrigeration unit to simultaneously supply cooling capacity to two warehouses that require different temperatures.I. Overview

Technical Specifications

Rated voltage: three-phase five wire AC 380V ± 10%, 50Hz;

Device capacity:<7kVA;

cryogen:R410a or other environmentally friendly refrigerants；

Cooling capacity: 5.3Kw;

Cooling capacity: approximately 600Kcal/n;

Temperature control: The high temperature warehouse can be controlled within 5℃Left and right, the low-temperature storage can be controlled within10℃about; Compressor power:3PH semi enclosed compressor protection level: IP44; Safety protection: overvoltage, overcurrent, and leakage protection measures.

IIISystem Instructions

The teaching experimental platform with one machine and two warehouses consists of two parts. refrigeration system：The main components include solenoid valve, thermal expansion valve, manual valve, evaporation pressure regulating valve, unit, etc., as well as corresponding vacuum pressure gauge -0.1~1.5MPa, digital temperature gauge, PT100 temperature transmitter -50~150℃Wait. Conducting experiments on this device can enable students to understand the function and usage of the evaporation pressure regulating valve. The working principle of the evaporation pressure regulating valve is that a refrigeration unit simultaneously supplies cold to two or more cold storage facilities. The required evaporation temperature (evaporation pressure) for each facility is also different, because the evaporation temperature of the high-temperature facility is higher and the evaporation temperature of the low-temperature facility is lower. When the compressor is working, the suction pressure is based on the evaporation pressure of the low-temperature facility, so the suction pressure is lower. At this time, steam pressure regulating valves (i.e. back pressure valves) are installed on the outlet pipelines of evaporators that need to maintain a high evaporation temperature (i.e. high temperature storage) to keep the pressure in front of the valve within the set range. Through throttling of the valve, the pressure behind the valve is made the same as the suction pressure, ensuring that each evaporator in the system operates normally under different working conditions.

4、 Equipment composition

The experimental bench is made of stainless steel material and has four universal wheels installed at the bottom. The operation panel is equipped with electrical protection components, power indicators, overcurrent protection, various temperature gauges, pressure gauges, control switches, etc.

The mesh plate is made of 304 stainless steel plate, which is processed into a regular mesh plate by CNC punching machine. The surface is arranged with regular shaped holes for easy fixation of various components. The plastic card holder supporting the shaped holes is processed by one-time plastic filling; The device is equipped with two mesh plates, one of which is a desktop fixed mesh plate, mainly used to fix the refrigeration unit, energy regulating valve, pressure gauge and pressure controller, drying filter, sight glass, hand valve and other components; The other part is the fixed mesh plate on the side of the refrigeration cabinet, mainly used to fix air conditioning valves, evaporation pressure regulating valves, internal balance thermal expansion valves, one-way valves, diaphragm solenoid valves, manual valves, etc.

Refrigeration system: consisting of a closed cold storage compressor, air-cooled condenser, internal balance thermal expansion valve, small ceiling mounted air cooler, drying filter, evaporation pressure regulating valve, energy regulating valve, sight glass, hand valve, diaphragm solenoid valve, one-way valve, pressure controller, high and low pressure gauge, threaded tee, reducing joint, shock resistant pressure gauge, accumulator, air conditioning valve, etc.

Refrigerator box: The whole machine is both sturdy and durable. The refrigeration cabinet is divided into two layers, with the upper layer simulating a low-temperature warehouse of 500mm x 385mm x 520mm (length x height x depth), which is equipped with LED lighting, small ceiling style air coolers, freezer temperature sensors, defrosting electric heaters, etc. The lower layer simulating a high-temperature warehouse of 520mm x 814mm x 240mm (length x height x depth), and the bottom of the cabinet body using universal wheels with brakes for easy movement.

Refrigerator Electrical Training and Assessment Module

The electrical training and assessment module for refrigerators adopts basic control circuits. The entire electrical system consists of a microcomputer temperature controller, high and low pressure control switches, single group pressure control switches, signal indicator lights, knob switches, etc.

5Practical Training Project

Cold storage system pipeline design and assembly project

Cold storage system pipeline design task

According to the task requirements, design the cold storage system pipeline reasonably and locate the refrigeration components

Cold storage system assembly task

Install the designed pipeline to the appropriate position of the corresponding component and complete the pressure maintenance and leak detection of the cold storage system.

Cold storage system debugging and operation

Electrical connection task of cold storage electrical system

Complete the wiring and connection of the cold storage system according to the electrical schematic and control requirements

Cold storage refrigeration system debugging and operation tasks

Complete the vacuuming, refrigerant filling, expansion valve adjustment, temperature controller testing, high and low pressure testing, electrical debugging, and adjustment of operating conditions for the cold storage system.

Practical training on electrical control for one machine and two warehouses;

Debugging of temperature automatic adjustment device for one machine and two warehouses;

Detection and elimination of faults in the training system with one machine and two warehouses;

Leak detection and maintenance of the one machine, two storage system;

Maintenance operation of one machine and two storage refrigeration system.