1. Brief description of equipment

The comprehensive training device for air-conditioning and refrigeration consists of an air-conditioning system and a dual-temperature cold storage system. It mainly strengthens students' comprehensive professional skills in the design and installation of air-conditioning and cold storage systems, electrical wiring, working condition debugging, fault diagnosis and maintenance, and the use of refrigeration tools.

The system consists of two parts: an electrical control system and a pipeline system. The two systems are separated independently. The electrical control system is composed of a power supply with leakage protection function and an assessment module, a split heat pump air-conditioning electrical control module and a dual-temperature cold storage electrical control module. The pipeline system is divided into two types: heat pump air conditioner and dual temperature cold storage.

The equipment has an intelligent fault assessment function, which can conduct training and assessment on the electrical control system of air-conditioning and dual-temperature cold storage for students.

2. Equipment characteristics

1. The air-conditioning and refrigeration comprehensive training device integrates the installation of air-conditioning and dual-temperature cold storage piping systems, leak detection, pressure retention, vacuuming, refrigerant charging, electrical control system wiring and system operation and debugging to meet practical training and teaching Requirements for engineering training and vocational skills competition.

2. The equipment adopts modular design, the electrical system and the pipeline system are separated independently, and the electrical system is equipped with test terminals and output terminals. Students can perform electrical testing, wiring and debugging operations. The piping system can carry out piping design and installation training operations.

3. The device intuitively displays the structure and working principle of the refrigeration system of air conditioning and dual-temperature cold storage, which is convenient for teaching demonstrations and students' understanding and mastery of textbook knowledge.

4. The device is equipped with a movable pressure gauge and 8-channel temperature inspection instrument, which is used to measure the temperature and pressure value of the key points of the system, and can calculate and analyze the system.

5. The whole set of training device system is true and complete, the structure is clear and intuitive, consistent with the actual air conditioner, cold storage refrigeration system, and electrical system, easy to understand, easy to learn and teach.

Three, technical parameters

1. Power supply: single-phase three-wire AC220V ±10% 50Hz

2. Ambient temperature: -5℃—40℃

3. Relative humidity: ≤85﹪ (25℃)

4. Power consumption of the whole machine: <1.5KW

5. Dimensions:

Cold storage unit and electric control system installation platform: 1500mm×800mm×750mm

Double-door double-temperature cold storage cabinet: 1200mm×700mm×1800mm

Air conditioner installation platform: 1000mm×750mm×1700mm

6. Main power switch with leakage protection IΔn≦30mA, time≦0.1S

7. With voltage, current indication, power supply indication

Four, structure and composition

The air-conditioning and refrigeration comprehensive training device is mainly composed of three parts: an air-conditioner installation platform, a cold storage unit, an electric control system platform, and a dual-temperature cold storage cabinet.

1. Air conditioner installation platform:

1) The installation platform adopts aluminum profile as the frame, which is composed of a "simulation wall" and a base. The indoor unit and outdoor unit are installed on the simulation wall and the base respectively.

2) The installation location of the outdoor unit and the indoor unit and the pipeline connection of the internal and external units can be installed and connected according to technical requirements and specifications. Students can position and open holes on the wooden board according to their needs, and train students on the installation and operation of air conditioners.

3) The wiring of all electrical components of the air conditioner is led to the outside, and students can connect them to the electrical control module of the air conditioner on the electronic control system platform according to the measurement and judgment of the electrical components.

4) The platform feet are equipped with silent universal wheels with locks for easy movement.

2. Cold storage unit, electronic control system platform:

1) The platform adopts aluminum profile as the main frame, and sheet metal plates as auxiliary materials. The desktop is spliced by industrial aluminum profiles with grooves for easy installation of training components and equipment. There are drawers under the desktop, which are used to place three training modules: "power supply and assessment module", "air-conditioning electrical control module" and "dual temperature cold storage electrical control module". There is a storage cabinet under the drawer for storing special refrigeration tools, vacuum pumps, and refrigerant cylinders.

2) The front part of the aluminum profile desktop is provided with a wiring area that combines a terminal block and a sheath jack, which serves as a connection transition area between the electrical training unit box and the controlled component. Wire troughs are installed around the desktop, which is simple and beautiful.

3) The cold storage unit adopts Taikang refrigeration unit, including hermetic compressor, air-cooled fin condenser, accumulator, unit valve, etc. The power supply is AC 220V-240V, 50Hz; the compressor power is 7/16P; the fluorine-free environmental protection R134A refrigerant is used. The unit is installed on the training table. It is equipped with cooling devices such as filter drier and sight glass.

4) Power supply and assessment module: The module includes a single-phase leakage protection switch, a digital display voltmeter, a digital display ammeter, a dual three-core socket, an intelligent fault assessor, etc.

5) Intelligent fault assessment device: It is composed of LCD screen, PVC keyboard, fault assessment interface, single-chip microcomputer and memory. It has functions such as fault setting, fault clearing, and score query.

6) Air-conditioning electrical control module: It adopts the form of wiring terminals and schematic diagrams plus measuring points. A safety sheath jack is installed on the upper part of the module board. The input and control output of some devices are led to the safety sheath jack on the panel, which is convenient The wiring of the control circuit and the executive components will deepen students' understanding and mastery of the peripheral circuits of the electrical control system. Install measuring points at the corresponding positions for electrical parameters and troubleshooting. At the same time, the module is equipped with an intelligent fault assessment board and assessment interface for fault setting and assessment.

7) Electric control module of dual-temperature cold storage: two intelligent temperature controllers, respectively control the temperature of the refrigerator compartment and the freezer compartment. Adopt the form of connecting terminal and schematic diagram plus measuring points, install the safety sheath jack on the upper part of the module, and the input and control output of some devices are led to the safety sheath jack of the panel, which is convenient for the wiring of the control circuit and the executive components. Deepen students' understanding and mastery of the peripheral circuits of the electrical control system. Install measuring points at the corresponding positions for electrical parameters and troubleshooting. At the same time, the module is equipped with an intelligent fault assessment board and assessment interface for fault setting and assessment.

8) The platform feet are equipped with silent universal wheels with locks to facilitate the movement of the equipment.

3. Freezer cabinet:

1) The library body is made of high-quality stainless steel plate as the skeleton, which is formed by mechanical processing, and the thermal insulation layer is made of polyurethane thermal insulation and fireproof foam material.

2) The entire space is divided into upper and lower levels. The upper level is the freezing zone, which uses a blow-fin evaporator; the lower level is the refrigeration zone, which uses a light-tube evaporator.

3) A mesh plate is installed on the side of the library body to install internally balanced thermal expansion valve, evaporation pressure regulating valve, solenoid valve, etc.

4) Upper and lower double door library body. The library contains lighting systems, drainage systems, etc.

5) The universal wheel with brake is installed at the bottom, which is suitable for moving and fixing, which is convenient to adjust the placement of the equipment.

Five, device function

1. Air conditioning system

1) Understand the structure and composition of household air conditioners;

2) Understand the heating and cooling working principles of heat pump air conditioners;

3) Understand the principle of air conditioner electrical control system;

4) Design, installation and operation of household wall-mounted split air conditioner;

5) Wiring operation of the air-conditioning electrical control system;

6) Air-conditioning system leak detection, vacuuming, and refrigerant charging operations;

7) Air conditioner debugging operation;

8) Assessment of air-conditioning electrical faults.

2. Dual temperature cold storage system

1) Understand the composition of the dual-temperature cold storage system;

2) Understand the working principle of the dual-temperature cold storage system;

3) Understand the principle of the electrical control system of the dual-temperature cold storage system;

4) Piping design and assembly operation of dual-temperature cold storage system;

5) Wiring operation of the electrical control system of the dual-temperature cold storage system;

6) Leak detection, vacuuming, and refrigerant charging operations of the refrigeration system;

7) Debugging operation of dual-temperature cold storage system;

8) Simulated electrical fault assessment of dual-temperature cold storage system.