- Added: 14.05.2021
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Compressor drawing with explanatory note
Table of contents
1. Design Task
2.Chilling Machine Principle Diagram
3. Image of the design cycle of the refrigerating machine in thermal
To the chart
4. Thermal calculation of the compressor and determination of its main dimensions
5.Electric motor selection for compressor
6. Calculation of gas distribution
7. Dynamic calculation
8. Strength calculation
9. Brief description of compressor design features
10. List of used literature
1. Initial data
1.1 Cooling capacity Q0 = 30 kW
1.2 Boiling point of refrigerant in evaporator t0 = 30 0C
1.3 Condensation temperature of refrigerant in condenser tc = + 10 0С
1.4 Refrigerant: R410a
1.5 Compressor type: non-ramjet.
KM - compressor; PRZ capacitor; RP - regenerative heat exchanger; RV - regulating ventel; And - evaporator
Image of the design cycle of the refrigerator in the diagram i-lgP
1-2 is a process for compressing freon vapors in a compressor;
2-3 - the process of cooling, condensation and supercooling of freon in the condenser;
3-4 - cooling process of liquid freon in regenerative heat exchanger;
4-5 - process of freon throttling in FR;
5-1 is a boiling process of liquid freon in an evaporator;
1-1 - Freon vapor heating process in regenerative heat exchanger
Crankshaft strength calculation
Calculation of the crankshaft is carried out according to the values of forces in positions unfavorable to the strength of the shaft. Stresses that occur in shaft sections are calculated by static loads, in which the action of forces is considered static. In addition to static loads calculation, endurance calculation is made, in which there are strength reserves of the most loaded shaft elements taking into account the cycle of loads. The double-support shaft of multi-row compressors with a relatively large distance between the main bearings should be calculated for rigidity to determine the deflection of the connecting rod journal along the length of the connecting rod insert. This deflection shall not exceed the minimum allowable thickness of the oil layer which is in the lubrication calculation.
Description of compressor design
9.1. Block crankcase
The crankcase is a cast iron structure equipped with replaceable cast iron sleeves. Block-crankcase is divided into crankcase and suction cavities by means of partition. Crankcase has two supports for crankshaft bearings. Openings are made in upper cylinder walls of block case through which refrigerant vapors from suction cavity enter cylinder liners. Crankcase part of casting is equipped with side and front covers. The side windows provide good access to the parts of the crank mechanism. The oil pump unit is freely accessible through the front cover.
The shaft is a stamped steel double-support with the location of the elbows in one plane at an angle of 1800. Shaft rests on two main rolling bearings. Bearing on the side of oil pump is fixed, on the side of gland - floating self-aligning.
9.3. Connecting Rod Group
Connecting rod-piston group consists of piston, connecting rod, inserts, pin, compression and oil-collecting rings. The piston is made of aluminum alloy and has a special shape that allows you to achieve the highest compressor performance
The lubricant flow rate for cylinders according to the standards of the Stransbourg Oil Conference is. Oils of XA35 type are applied.
The compressor uses throne aluminum pistons, valves at suction and discharge are accepted according to calculations - strip ones.
Cooling of cylinders - water. Water passes through the suction pipe through the sleeve and then goes to the suction. The landing place is sealed with special paranite gaskets.
The flywheel is an energy accumulator of the piston compressor, which allows overcoming the inertia of the movement mechanism in dead points.
Gear oil pump of built-in type. Oil after oil pump is supplied for lubrication into friction pairs through drilling in shaft and connecting rod. Before entering the oil pump, it passes the coarse filter.
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