AIR CONDITIONING SYSTEM


  1. CONSTRUCTION


    1. An ESB27C type compressor with motor assembly that is driven by a motor is used. The basic construction and operation of this compressor are the same as an ordinary scroll compressor, except that it is driven by an electric motor.

    2. The compressor with motor assembly consists of a spirally wound fixed scroll and rotating scroll that from a pair, an injection block, an brushless motor, an oil separator, a motor shaft and an air conditioning inverter.

    3. An air conditioning inverter is integrated with the compressor with motor assembly. This inverter operates the compressor on HV battery voltage. As a result, the air conditioning system is actuated without depending on the operation of the engine, achieving a comfortable air conditioning system and low fuel consumption.

    4. The fixed scroll is integrated with the housing. Because the rotation of the shaft causes the rotating scroll to revolve while maintaining the same posture, the volume of the space that is partitioned by both scrolls varies to perform the suction, compression and discharge of the refrigerant gas. Locating the suction port directly above the scrolls enables direct suction, achieving improved suction efficiency. Containing a built-in oil separator, the compressor is able to separate the compressor oil that is intermixed with the refrigerant and circulates in the refrigerant cycle, achieving reduction in the oil circulation rate.

    5. Low-moisture permeation hoses are used for the suction and discharge hoses of the compressor in order to minimize the entry of moisture into the refrigerant cycle.

    6. A thrust valve mechanism is used as a back pressure adjustment method, which enables appropriate adjustment of back pressure to reduce excessive pressure and improve efficiency.

      A004CPEC02
      *1 Rotating Scroll *2 Fixed Scroll
      *3 Oil Separator *4 Discharge Port
      *5 Thrust Valve *6 Brushless Motor
      *7 Motor Shaft *8 Air Conditioning Inverter

      CAUTION:

      In order to ensure the proper insulation of the internal high-voltage portion of the compressor with motor assembly and the compressor housing, this model has used a compressor oil (ND11) with a high level of insulation performance. Therefore, never use a compressor oil other than ND11 type compressor oil or its equivalent.

  2. OPERATION


    1. The compressor with motor assembly performs suction, compression and discharge of refrigerant gas as described in the table below.

      Stroke Operation
      Suction As the capacity of the compression chamber, which is created between the rotating scroll and the fixed scroll, increases in accordance with the revolution of the rotating scroll, refrigerant gas is drawn in from the intake port.
      Compression As the movable scroll orbits eccentrically, the volume of the high-pressure chamber decreases. With this, the pulled in refrigerant is steadily compressed and discharged into the center of the fixed scroll. Partway through the compression process, partially compressed refrigerant is injected. As the movable scroll orbits eccentrically, the gas injection port is isolated from the compression chamber and the flow of injected refrigerant stops. The compression of the refrigerant is complete after the movable scroll completes 2 orbits.
      Discharge When the compression of the refrigerant gas is completed and the refrigerant pressure becomes high, the refrigerant gas discharges through the discharge port located in the center of the fixed scroll by pushing the discharge valve.
      A004CI0E02

    2. Thrust Valve Mechanism Operation


      1. If the back pressure is less than the value required, pressure is supplied from the compression room to the back pressure room using the thrust valve installed in the rotating scroll to adjust the back pressure to the appropriate value.

        A004CEXE02