WO2011070589A2 - Conical shape single rotor compressor - Google Patents

Abstract

A conical shape single rotor compressor is used for compressing a fluid such as air, gas or refrigerant. It comprises a conical shape rotor (1) placed horizontally in a taper housing (5) of the compressor. The said rotor (1) is mounted between a fixed bearing (7) at the discharge end and a detachable bearing (3) at the suction end of the rotor shaft (4) for smooth operation. The rotor (1) further consists of helical grooves (22) for compressing the fluid from high volume of fluid to low volume of fluid, which develops a high pressure at the discharge end of rotor (1). An inlet pipe (2) is provided for sucking the fluid through the housing (5) connected between the helical grooves (22) on the rotor (1),whereas the high pressure fluid is going out through the discharge pipe (16) and the compressor efficiency is enhanced due to smooth operation and less maintenance.

Description

TITLE: - CONICAL SHAPE SINGLE ROTOR COMPRESSOR

FIELD OF THE INVENTION

The present invention relates to a rotary compressor & particularly it relates to a new compression technology which to be invented herein. It is to be used for compressing the fluid such as refrigerant, gas as well as air.

PRIOR ART

The present invention relates to rotary compressor used for the compression of fluid such as air or refrigerants in the vapour compression system. Rotary compressors are at present widely used means of compressing air, process gas and refrigerants. Positive displacement compressors are today a mature product. They are subjected to the highly competitive market especially in air compression and refrigeration.

The heart of the vapour compression system is the compressor. The four most common types of refrigeration compressors are reciprocating, screw, centrifugal and vane. The reciprocating compressor consists of a piston moving back and forth in a cylinder with suction and discharge valves arranged to allow pumping to take place. The screw, centrifugal and vane compressors all use rotating elements, the screw and vane compressors are positive -displacement machines, and the centrifugal compressor operates by virtue of centrifugal force.

Each of the four components of a vapour - compression system - the compressor, the condenser, the expansion device, and the evaporator- has its own peculiar behavior. At the same time each component is influenced by conditions imposed by the other members of the quartet. A change in condenser- water temperature, for example, may change the rate of refrigerant the compressor pumps, which in turn may require the expansion valve to readjust and the refrigerant in the evaporator to change the pressure. The components of the vapour compression cycle singly, analyzing their performance as individuals, and then observe how they interact with each other as a system. The compressor is the first component to be analyzed. The four types of compressors i.e. reciprocating, screw, and vane and centrifugal, all have somewhat different qualities, so that each type has found a sphere of application where it has advantages over the others. A reasonably accurate statement of where the compressors are used can be based on their refrigerating capacity. Reciprocating compressor dominate from very small refrigerating capacities to about 300kW. Centrifugal compressors are most widely used for units having refrigerating capacities of 500 kW and above. The screw compressor has found a niche in the 300-to-500kW capacities and competes against large reciprocating compressors and against small centrifugal compressors. The vane compressor competes against the reciprocating compressor primarily in the market for domestic refrigerators and air conditioners.

Probably more reciprocating compressors are manufactured than any other type because they are choice for smaller refrigeration units in high production .For high capacity refrigeration systems; the large physical size of the reciprocating compressor sh ifts the choice in favour of the more compact screw and centrifugal compressors, which battle for the market in the 300-to-500kW capacities. An uneasy truce sometimes is arrived at in industrial refrigeration plants, where combination of screw and reciprocating compressors is used. The operating strategy is to use the screw compressor for the base load and bring on reciprocating compressors to accommodate the variations above the base. The reason for this distribution of load is that the screw compressor is efficient when operating near full load; it has fewer moving parts than the reciprocating compressor and is developing a reputation for long operating life. The reciprocating compressor seems to have better efficiencies at part load operation than the screw compressor and can accommodate the varying portion of the total load more efficiently.

The centrifugal compressor is the choice for large capacity units, particularly for water chilling plants used for large air conditioning installations. A feature of most such installations is that air is cooled at a large number of locations remote from the compressor room. Since using water as the heat conveying agent in these cooling coils is preferable to the complexities of delivering refrigerants, the refrigeration unit for most large air conditioning plants is a water chiller. This concept coincides with the characteristics of a centrifugal unit which uses low-density refrigerants. The suction and discharge pipes needed for the low- density refrigerant are of large diameter, and it is impractical to run them large distances. Instead, they are closely coupled to the water-chilling evaporator and the water cooled condenser.

While it may seen that the market distribution of compressors may now be stable, engineers should be alert to the potential for new compressor developments. The screw compressor, for example, which was not a factor in the industry a few decades ago, has now established itself. The efficient operation of compressors is mainly dependant on the rotor profile, clearance distribution and other components.

Every increasing market demand for efficient rotary compressor i. e. screw compressors requires today that compressor designs are tailored upon their duty, capacity and manufacturing capability. A suitable procedure for optimization of rotor shape in a screw compressor, dimension and operating parameters ,which results in the most appropriate design for a given compressor duty is also presented. Compressors thus designed achieve higher delivery rates and better efficiencies.

DESCRIPTION OF THE INVENTION:-

Please refer to FIGS. 1 and 2.The present invention relates to a conical shape single rotor compressor for compressing the fluid such as air, gas or refrigerant in the field of compressing technology comprising a conical shape Rotor (1) placed horizontally in the housing (5) as shown in FIG. l . The said rotor is mounted between fixed bearing (7) and detachable bearing (3). The rotor consisting of helical grooves (22) and the discharge end journal (21) at the outlet end of the rotor shaft (24) as shown in FIG. 2, which is detachably mounted in the bearing. Further the bearings (7) are fixed in the discharge end housing (8) and bearing (3) within a suction end housing (4) as shown in FIG. l . An inlet pipe (2) is provided for sucking the fluid through housing and got connected between the helical grooves on the rotor as shown in FIG.1.The discharge end housing and suction end housing are assembled with the housing(5) by the bolts and tap drill provided in the housing.

When the rotor mounted in the bearing rotates by using the motor coupled with the shaft (9), then the fluid is sucked by the inlet pipe and starts rotating it throughout the rotor within helical grooves in the embodiment of the present invention that the shape of rotor is conical, due to which the volume of fluid will be decreases from the suction side of rotor and increases the pressure at discharge side. When the fluid flows from suction to discharge end, the pressure of the fluid increases by decreasing the volume of the fluid due to conical shape of the rotor and discharges it through the discharge pipe (6) with high pressure.

The bearing (3) is mounted in the suction end housing (4). The shaft (9) is passes through out the suction end housing and is coupled to the motor. The said compressor is integral with the compressor sub base (10) for the fixed installation.

Claims

What is claimed as :-

1. A CONICAL SHAPE SINGLE ROTOR COMPRESSOR for compressing the fluid such as air, gas or refrigerant, comprising a conical shape Rotor(l) as shown in FIG. 1 placed horizontally in the taper housing (5) as shown in FIG. l . the said rotor is mounted between fixed bearing (7) & detachable bearing (3), the said rotor further consisting of helical grooves (22) and the discharge end journal (21) of the rotor shaft (24) as shown in FIG. 2, which is detachably mounted in the bearing (7), within a discharge end housing (8) as shown in FIG.1 , an inlet pipe (2) is provided for sucking the fluid through the housing get connected between the helical grooves on the rotor as shown in FIG.1 ,

2. A conical shaped compressor as claimed in claim 1 , wherein an angle of helix / grooves or thread shall be changed in accordance with requirements,

3. A conical shaped compressor as claimed in claim land 2, wherein any type of thread on rotor can be used as per the requirement,

4. A conical shaped compressor as claimed in claim 1 , wherein the internal section of the housing/rotor is tapered or conical type and angle of inclination may be varying,

5. A conical shaped compressor as claimed in claim 1, wherein the length, no. of turns of the thread and diameter of the rotor may be change with required capacity of the compressor,

6. A conical shaped compressor as claimed in claim 1 , wherein, the motor gets started, the fluid is sucked by the inlet pipe and starts rotating it throughout the rotor within helical groove flows from high volume of fluid to low volume of fluid, creating high pressure due to low volume at discharge end,

7. A conical shaped compressor as claimed in claim 1, wherein , the internal section of housing may be converted in the grooves section internally corresponds with the helical threads provided on the rotor,

8. A conical shaped compressor as claimed in claim 1, consisting of helical thread, it's shape and size mainly depend on the overall dimension of the compressor rotor,

9. A CONICAL SHAPE SINGLE ROTOR COMPRESSOR for compressing fluid such as air, gas or refrigerant, such as here in described with reference to an accompanying drawings.