Experimental Discussion on Operation of Cylinder Compressor Cold Rolling Compressor

For the digital scroll compressor, the energy regulation control of the compressor is realized by the external solenoid valve 7. The specific method is to utilize the flexible structure of the dynamic and static scrolls to periodically engage and disengage the moving and stationary scrolls. When the external solenoid valve is closed, like the fixed speed scroll compressor, the digital scroll compressor The dynamic and static scrolls are in meshing state, and the energy output is 100%; when the external solenoid valve is opened, the orbiting scroll and the fixed scroll are slightly separated, so that the compressor does not compress the refrigerant nor the refrigerant discharges the compressor. At this time, the energy output of the compressor is 0, and the digital scroll compressor can realize the energy adjustment of the compressor by controlling the opening and closing time of the external solenoid valve for a certain period of time. Since the distance between the moving and stationary plates is only 1mm, the mechanical impact caused by energy regulation is small. At the same time, the number of opening and closing of the external solenoid valve can reach 40 million times, which ensures the reliability of the compressor operation. In order to fully reflect the operating conditions of the unit, pressure and temperature measuring points are arranged along the unit process. For pressure and temperature measurement points.

Experimental unit indoor and outdoor machine flow chart and measuring point arrangement 1 compressor; 2 four-way reversing valve; 3 condenser; 4 cooler fan; 5 reservoir; 6 gas-liquid separator; 7 solenoid valve (PWM); Expansion valve; 9 evaporator; 10 evaporator fan.

Experimental results and analysis The experimental study on the variable air volume characteristics of the digital scroll air duct air-conditioning air conditioner (heat pump) unit is carried out under the nominal cooling conditions specified in GB/T188362002, that is, the indoor side inlet air dry bulb temperature is 27, the indoor side The inlet air wet bulb temperature is 19, the outdoor side inlet air dry bulb temperature is 35, and the outdoor side inlet air wet bulb temperature is 24. Reflecting the relative cooling capacity of the unit as a function of the air volume based on the rated air volume cooling capacity. Relationship, due to the energy regulation of the digital scroll compressor, the output of the refrigeration capacity of the unit can actively adapt to the requirement of cooling capacity reduction. When the air volume is reduced to 20% of the rated air volume, the cooling capacity of the system is also the rated air volume. 20% of the cooling capacity. The change of the air temperature with the air volume also reflects that when the air volume changes by 20% and 100%, the fluctuation of the air temperature is only 06, and the stability of the air temperature also ensures the temperature and humidity of the air conditioning area. Stable. It reflects the relationship between the relative value of the unit input power and the air volume when the input power of the rated air volume is used as the reference. The digital scroll compressor performs energy adjustment through the disengagement of the dynamic and fixed scroll, and the compressor can adjust the state. The compression work is generated. Therefore, when the energy adjustment range of the compressor is increased, the input power of the unit is greatly reduced, which ensures that the unit can maintain relatively high operating efficiency when operating under variable air volume conditions (6). ). It can also be seen that the effect of the unit efficiency on the ratio of the total energy efficiency ratio and the total cooling capacity to the total input power for the digital scroll unit is basically the same. It reflects that the average exhaust pressure of the unit decreases slightly with the decrease of air volume. As shown, the average suction pressure of the unit increases slightly with the decrease of air volume. Therefore, when the unit is running at low air volume, the pressure ratio of the system is The decreasing trend makes the exhaust temperature and the maximum exhaust temperature of the system decrease with the decrease of the air volume, and the difference between the highest exhaust temperature and the average temperature appearing during operation is small, and the exhaust gas temperature will decrease. It contributes to the improvement of the service life of the compressor. This also reflects the good variable air volume operation characteristics of the air duct air-conditioning (heat pump) unit due to the adjustable function of the digital scroll compressor.

Conclusion Through the experimental research on the operation of the air duct air-conditioning (heat pump) unit with digital scroll compressor under the condition of refrigeration variable air volume, the variable air volume operation of the digital scroll air duct air-conditioning (heat pump) unit is fully grasped. Characteristics. Due to the energy regulation of the digital compressor, the unit has a good adaptability to the change of the air volume, which is not only reflected in the energy and efficiency characteristics of the unit, but also in the exhaust temperature, intake temperature and exhaust pressure. , suction pressure, unit outlet temperature and other parameters that reflect the characteristics of the unit operating state. The digital scroll compressor is used for the air duct air-conditioning (heat pump) unit, which can ideally meet the variable air volume adjustment requirements of the unit and achieve the energy-saving and stable operation of the unit. In actual use, the energy adjustment ratio of the digital scroll compressor should be reasonably controlled to achieve the best match between the compressor's adjustable and variable working conditions.

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