DYLR-SM double-door refrigerator comprehensive training device

Release time：2024-06-18 05:30viewed：times

1. Overview:
The "Double-door Refrigerator Comprehensive Tr*ning and Assessment Device" is developed and designed for refrigeration majors, home appliance rep*r majors, various skill tr*ning and national vocational skill appr*sal departments in colleges and universities. The device integrates refrigeration, electrical control and fault simulation. The production and tr*ning device is fully rationally l*d out. It is a comprehensive, intuitive, open and highly applicable teaching tr*ning and assessment platform, allowing students to master the structure, principle and characteristics of direct cooling/indirect cooling refrigerators.
2. Technical parameters:
1. Input power: single-phase three-wire AC220V±10% 50Hz
2. Device capacity: <0.2KVA
3. Dimensions: 600×600×1700mm
4. Refrigerant type: R600
5. Safety protection: with leakage voltage and leakage current protection devices, safety meets national standards
2. Features:
1. The tr*ning device intuitively displays the system structure and working principle of direct cooling/indirect cooling refrigerators. You can clearly see the structure of the refrigeration cycle system and the real objects of the m*n components, which is convenient for teaching demonstrations and students' understanding and mastery of textbook knowledge. In addition, a sight glass is provided in the pipeline to observe the state of the refrigerant; the high-pressure pipeline is the red part, and the low-pressure pipeline is the blue part.
2. The whole set of tr*ning equipment integrates direct cooling and indirect cooling refrigerators. The whole refrigerator system is real and complete, with a clear and compact structure, which is consistent with the actual refrigerator refrigeration system and electrical system. At the same time, it can meet the requirements for direct cooling and indirect cooling refrigerator tr*ning.
3. The system uses a real refrigeration unit (compressor, fin coil evaporator, aluminum composite plate inflation evaporator, wire condenser, etc.)
4. The device is equipped with a direct cooling/indirect cooling refrigerator electrical control circuit wiring area, which can complete the operation mode of different startup methods, which is conducive to students applying theory to practice and cultivating students' practical operation skills.
5. Simulated faults can be set. Students can analyze the possible causes of the fault according to the process, determine the scope of the fault, and troubleshoot. It is conducive to the development of skills identification and assessment.
III. Basic equipment of the device:
1. Tr*ning cabinet: iron double-layer matte dense spray structure, aluminum panel. Two control valves are added to the refrigeration system to switch between direct cooling and indirect cooling refrigerators. A cabinet is set up at the bottom of the experimental cabinet to place experimental connection wires, tools and other experimental supplies. The freezer door and refrigerator door of the refrigerator are transparent, which is convenient for observing the frost on the surface of the evaporator in the freezer. The condenser is placed outside the refrigerator at the back.
2. Configuration table of refrigeration system of direct cooling/indirect cooling refrigerator:

Serial number	Equipment name and model	quantity	Remark
1	1/9 HP refrigerator compressor QD30 (85 W 0.6A R600)	1 set
2	Direct cooling evaporator (aluminum composite plate inflation evaporator and lower evaporator)	1 set
3	Indirect cooling evaporator (fin coil evaporator)	1 set
4	Steel wire condenser (17 gears)	1 set
5	Condensing fan (intercooler)	1 set
6	Lights and door switches	1 set
7	Timing defrost time relay	1
8	Compensation heating wire, compensation switch	1 set
9	Thermostat (WDF type, WPF type)	1 set
10	Defrost thermostat (-5OC), defrost temperature fuse (65OC)	1 set
11	Bimetallic thermal protection relay	1 set
12	PTC starter, heavy hammer starter	1 set
13	Capillary	2 roots
14	The electromagnetic valve	2	Instant/Direct mode switch

3. 1 AC voltmeter: measuring range 0~250V, used to monitor power supply voltage
4. 1 AC ammeter: measuring range 0~5A, used to observe system startup current and normal working current
5. 1 temperature meter: using PT100 sensor , three-and-a-half-digit display, switched by band switch, can measure freezer temperature, refrigerator temperature, condenser inlet and outlet temperature respectively
6. 2 pressure vacuum gauges: measuring ranges are 0.1~1.6MPa and -0.1~2.5MPa respectively, can display the pressure on the high-pressure side and low-pressure side of the system
7. 1 fault box: embedded in the experimental cabinet, used to set faults, and equipped with a lock. The fault types that can be set are: power supply circuit, lighting circuit, defrost circuit, compressor protection circuit, etc. 8. 1
set of current type leakage protection device: when the ground leakage current exceeds a cert*n value, the power supply will be tripped and cut off; thermal protection device is provided to protect the compressor from overheating and overload. 9. 1 set of practical
tr*ning connection wires: the practical tr*ning connection wires and sockets adopt anti-electric shock structure, which is safe, reliable and anti-electric shock.
10. Single-chip microcomputer , PLC programmable design and control virtual simulation software:
This software is developed based on Unity3D, with built-in experimental steps, experimental instructions, circuit diagrams, component lists, connection lines, power on, circuit diagrams, scene reset, return and other buttons. After the connection and code are correct, the 3D machine model can be operated by the start/stop, forward motion, and reverse motion buttons . When the line is connected, the 3D machine model can be enlarged/reduced and translated.
1. Relay control: Read the experimental instructions and enter the experiment. By reading the circuit diagram, select relays, thermal relays, switches and other components in the component list and drag and drop them into the electrical cabinet. The limiter is placed on the 3D machine model. You can choose to cover the cover. Some component names can be renamed. Then click the connection line button to connect the terminals to the terminals. After the machine circuit is successfully connected, choose to turn on the power and operate. If the component or line connection is wrong, an error box will pop up, and the scene can be reset at any time.
2. PLC control: The experiment is the same as relay control, with the addition of PLC control function. After the connection is completed, press the PLC coding button to enter the program writing interface, and write two forward and reverse programs. There are a total of 12 ladder diagram symbols. After writing, select Submit to verify the program. After successful verification, turn on the power to operate. Error boxes will pop up for components, line connections, and code errors, and the scene can be reset at any time.
3. MCU control: The experiment is the same as relay control, with the addition of MCU control function. After the connection is completed, press the C coding button to enter the programming interface, enter the correct C language code, and submit for successful verification. Turn on the power to operate. Error boxes will pop up for components, line connections, and code errors, and the scene can be reset at any time.
4. Fault Description

serial number	Fault simulation instructions	Fault phenomenon
K1	Door light open	In direct cooling mode, the compressor is working and the door light is off
K2	The common terminal of the composite door switch is open	In the indirect cooling mode, the fan does not rotate and the door light does not light up
K3	Fan motor open circuit	The fan does not rotate in the indirect cooling mode
K4	Door switch open	The door light does not light up in direct cooling mode
K5	Compensation switch open	In direct cooling mode, when the temperature is below 5OC, the compressor cannot start
K6	Defrost thermostat open circuit	During defrosting in the indirect cooling mode, the defrost fuse is blown
K7	WDF thermostat HL both ends open circuit	In direct cooling mode, the door light is on and the compressor does not work
K8	WDF thermostat LC ends open circuit	In direct cooling mode, the door light is on and the compressor does not work
K9	WPF thermostat LC ends open circuit	In indirect cooling mode, the door light is on and the compressor does not work
K10	Both ends of the defrost time relay BW-BK are open	In intercooling mode, the door light is on and the compressor does not work
K11	Defrosting temperature fuse is open	In the defrosting state in the indirect cooling mode, the defrosting does not work
K12	Compensation heating wire open circuit	In direct cooling mode, when the temperature is below 5OC, the compressor cannot start
K13	Defrosting electric heating tube open circuit	In the defrosting state in the indirect cooling mode, the defrosting does not work
K14	Protection relay open circuit	The compressor cannot start and there is no current display
K15	PTC starter open circuit	The compressor cannot start, the current is too high (5 to 10 times the compressor working current)
K16	The starting contact of the heavy hammer starter falls off	The compressor cannot start, the current is too high (5 to 10 times the compressor working current)
K17	The compressor start winding 1-2 is open at both ends	The compressor cannot start, the current is too high (5 to 10 times the compressor working current)
K18	Compressor running winding 1-3 both ends open circuit	The compressor cannot start, the current is too high (5 to 10 times the compressor working current)
K19	System dirty and blocked	In the running state, the high pressure end is high and the low pressure is negative.
K20	System Refrigerator	In the running state, the high pressure end is high and the low pressure is negative.

V. Tr*ning projects:
1. Operation of special tools
2. Welding of refrigeration system pipes
3. Pressure test and leak detection of refrigeration system
4. Vacuuming and charging of refrigerant in refrigeration system
5. Understanding and measurement of electrical circuit components of refrigerators
6. Wiring of electrical control circuits and system operation of direct-cooling refrigerators
7. Wiring of electrical control circuits and system operation of indirect-cooling refrigerators
8. Tr*ning and fault analysis of direct-cooling refrigerator m*ntenance
9. Tr*ning and fault analysis of indirect-cooling refrigerator m*ntenance

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