1. TT
The compressor

2. Contents The refrigerant compressor Internally controlled compressor
Magnetic coupling
Externally regulated compressor
Overload protection
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3. The refrigerant compressor
Swash plate compressor with electromagnetic coupling
This compressor type is installed either with or without internal regulation of the delivery output.
F208_027
Video "Initial operation"
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4. Internally controlled compressor
With electromagnetic coupling
Drive
F208_047
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5. Internally controlled compressor
Overview
Swash plate
Regulating valve
Guide rail
Calibrated restrictor hole
Drive shaft
High pressure
Low pressure
View with sharp angled swash plate, full load
Upper side
Lower side
Springs
F208_047
Drive hub
Piston
Chamber pressure
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6. Internally controlled compressor
Swash plate adjustment increases
Bellows 2
Bellows 1
Regulating valve
Chamber pressure
Chamber pressure
Restrictor hole
Low pressure (high) and force of spring 1 greater than chamber pressure and force of spring 2. Swash plate adjustment increases.
With the compressor inoperative and after pressure equalisation between the high-pressure and low-pressure sections, the swash plate is pressed by the springs into a defined position. This position produces a delivery output (drive-off performance) of 40%.
F208_048
Spring 1
Spring 2
High pressure
Low pressure
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7. Internally controlled compressor
Swash plate adjustment decreases
Bellows 2
Bellows 1
Regulating valve
Chamber pressure
Chamber pressure
Restrictor hole
Low pressure (low) and force of spring 1 less than chamber pressure (restrictor hole) and force of spring 2. Swash plate adjustment decreases.
Spring 1
Spring 2
F208_049
High pressure
Low pressure
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8. Magnetic coupling Overview Diagram showing coupling switched off
Diagram showing coupling switched on
Belt pulley with bearing
Compressor drive shaft
Spring plate with hub
Compressor housing
Coupling play "A" must be observed! (ELSA)
Solenoid coil
F208_002
F208_003
Flow of power
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9. Externally regulated compressor
Overview
Compressor regulator valve N280
Compressor
The concept of the new Denso – 6 SEU 12C compressor:
Axial piston compressor, 6 pistons
No magnetic coupling, runs permanently with system Runs at about 2% output even without electric actuation in order to assure lubrication.
With variable stroke volume to adapt to refrigerant output requirement
External regulation (previously internal via spring and valves) via control valve for N280 compressor.
Belt pulley with rubber moulding – overload protection
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10. Externally regulated compressor
Maximum delivery of swash plate
Compression chamber
Hollow piston
Swash plate
Control valve N280
Crankcase pressure
High pressure
Suction pressure
F240_012
Drive shaft
Suction side
Crankcase
Return spring
High pressure side
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11. Externally regulated compressor
Zero delivery of swash plate
With "Zero delivery", the swash plate stops at approx. 2% delivery output. This slight stroke movement ensures the internal lubrication of the compressor!
F240_011
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12. Externally regulated compressor
Compressor regulator valve N280
A Crankcase pressure B High pressure C Low pressure
Direction of full load – A to B separated
Direction of no load – A to B opened
C restricts control valve depending on low pressure.
1 – Electromagnetic components
Left diagram
1 – mechanical component: a pressure-sensitive element in the low-pressure circuit of the valve influences regulation in relation to pressure conditions on the low-pressure side
2 – electromagnetic component: this valve is actuated by E 87 at a frequency of 500Hz without increments, the valve plunger thus achieves "floating status".
Any range from completely open to completely closed possible.
Right diagram
The valve is open in unenergised state, the high-pressure channels and compressor crank housing are thus joined => pressure is balanced.
2 – Mechanical components
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13. Overload protection Overview Belt pulley Rubber moulding Drive shaft
Drive plate
The belt pulley and the drive plate are force-fitted by a rubber moulding. When the compressor is working properly, both pulleys turn together at the same ratio.
Rubber moulding
F263_076
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14. Overload protection Drive blocked Deformation of blockage
Rubber moulding
Severed material
Blocked drive plate
To protect the belt drive, both plates are separated by the rubber element in the event of resistance or blockage. In serious conditions, the entire compressor must be renewed!
Rubber moulding
F263_077
Severed material
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15. Thank you
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16. Break
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