CN2874071Y

CN2874071Y - Compressor with elliptical cylinder

Info

Publication number: CN2874071Y
Application number: CN 200620039390
Authority: CN
Inventors: 耿玮
Original assignee: Shanghai Hitachi Household Appliance Co Ltd
Current assignee: Shanghai Hitachi Household Appliance Co Ltd
Priority date: 2006-02-07
Filing date: 2006-02-07
Publication date: 2007-02-28
Anticipated expiration: 2016-02-07

Abstract

The utility model relates to a compressor having an oval cylinder. The compressor comprises a cylinder, a pair of vane recesses arranged symmetrically, a piston, an eccentric shaft whose rotary center of the eccentric shaft coincides with the center of the cylinder, and a pair of snifter valve assemblies. The section of the inner bore of the cylinder is oval. The long shaft of the oval is located near to an aspiration hole. The deflection angle of the long shaft of the oval relative to the aspiration hole is preferably 10 degree at both sides. The utility model can overcome the structural shortcoming associated with prior round cylinders of double-vane compressors, reduce the radial leakage of ''cylinder-piston'', and improve the volumetric efficiency of compressors and COP.

Description

A kind of compressor with oval cylinder

Technical field

This creation is relevant for field of Refrigeration and Air-conditioning such as air conditioner, refrigerators, especially relevant for a kind of rolling rotor type compressor and wobble-piston type compressor.

Background technique

The double-leaf compressor is on the symmetrical position of common rolling rotor type compressor blade, increases a blade, air suction structure more respectively, and corresponding exhaust structure is set.Like this, blade, air-breathing and exhaust structure that two 180 degree that are staggeredly located are arranged on cover cylinder pump assembly, correspondingly the crescent-shaped space between cylinder and rolling piston is divided into two relatively independent working rooms, eccentric main axis whenever revolves to go around just can realize twice exhaust.

Fig. 1 is a kind of traditional double blade compressor pump body structure cross-sectional schematic.This compressor comprises a cylinder 91,93, one eccentric shafts 94 of 92, one pistons of blade of a pair of 180 degree symmetric arrangement, and the rotating center of eccentric shaft 94 overlaps with the center of cylinder 91, and a pair of Aspirating valves assembly 95.Fig. 2 is the working procedure cross-sectional schematic of double-leaf rolling piston compressor shown in Figure 1.At each working room, eccentric shaft 94 rotates a circle partly just can finish a complete air-breathing exhaust work circulation.Shown in Fig. 2 A, when φ=0, air aspiration cavity X1 has certain scale, and air aspiration cavity X2 just begins to form, and compression chamber Y2 has reached quite high pressure, begins exhaust to about 70 degree; Shown in Fig. 2 B, during φ=pi/2, air aspiration cavity X2 continues to enlarge, and it is maximum that air aspiration cavity X1 volume reaches, and compression chamber Y2 continues exhaust; Shown in Fig. 2 C, then, along with the continuation rotation of eccentric shaft, air aspiration cavity X1 is transformed into compression chamber Y1, and volume dwindles gradually, and pressure, temperature raise gradually; Shown in Fig. 2 D, after reaching exhaust pressure, begin exhaust.So go round and begin again.

At present, the cross section of cylinder bore 911 is cylindrical.Figure 3 shows that " cylinder-piston " radial clearance curve in the week that obtains according to the piston Calculation and Analysis of Force, start angle is corresponding to φ=0 of Fig. 2.Because two acting chambers 180 of double-leaf compressor degree is symmetrically distributed, therefore the pulsation period of " cylinder-piston " radial clearance curve also is 180 degree, and the bigger scope in gap just in time with " compression chamber-air aspiration cavity " High Pressure Difference area coincidence.The structure that double-leaf is symmetrically distributed, having limited the double-leaf compressor can not be as single blade compressor, by piston " cylinder-piston " radial clearance when on high-tension side eccentric installation reduces High Pressure Difference.Simple cylinder bore diameter or the piston external diameter of increasing, though can make radial clearance curve integral body move down (seeing circular cylinder 2 curves among Fig. 3), the problem bigger than normal of the radial clearance during High Pressure Difference still can not be resolved.Because the radial leakage flow is directly proportional with the cube of radial clearance, has caused radial leakage to increase greatly, compressor volume decrease in efficiency, (Coefficient of Performance COP) reduces the coefficient of performance.

Summary of the invention

In view of existing problem of said structure and requirement thereof, the purpose of this creation is a kind of new cylinder structure of design, overcomes the structural imperfection of present double-leaf compressor circular cylinder, reduces " cylinder-piston " radial leakage amount, improve compressor volume efficient, improve COP.

For achieving the above object, this creation provides-kind have a compressor of oval cylinder, this compressor comprises a cylinder, the blade groove of a pair of symmetric arrangement, a piston, an eccentric shaft, the rotating center of eccentric shaft overlaps with the center of cylinder, and a pair of Aspirating valves assembly, the cross section of cylinder bore is oval.This long axis of ellipse is preferably in each 10 degree scope of both sides with respect to the deflection angle of suction port near suction port.

Description of drawings

Fig. 1 is a kind of traditional double blade compressor pump body structure cross-sectional schematic.

Fig. 2 is the working procedure cross-sectional schematic of double-leaf rolling piston compressor shown in Figure 1.

Figure 3 shows that " cylinder-piston " radial clearance curve in the week that obtains according to the piston Calculation and Analysis of Force.And,

Fig. 4 is this creation compressor pump body structure cross-sectional schematic.

Embodiment

With reference to figure 4, this creation is a kind of compressor with oval cylinder.This compressor comprises a cylinder 11,12, one pistons of the blade groove of a pair of symmetric arrangement, and an eccentric shaft, the rotating center of eccentric shaft overlaps with the center of cylinder 11, and a pair of Aspirating valves assembly.In this creation, according to the tendency of Fig. 3 " cylinder-piston " radial clearance curve, the cross section of cylinder bore 111 is oval.This long axis of ellipse is preferably in each 10 degree scope of both sides with respect to the deflection angle of suction port 112 near suction port 112.

As shown in Figure 3, " cylinder-piston " radial clearance curve of this moment has obtained decline by a relatively large margin again on the basis of " circular cylinder 2 ".According to test result, after adopting ellipse, " cylinder-piston " radial clearance (particularly in " compression chamber-air aspiration cavity " High Pressure Difference stage) has reached significantly and has descended, radial clearance is leaked the volumetric efficiency slippage that causes and is about 30% of former circular cylinder structure, for 69% of the structure behind simple increase cylinder bore diameter or the piston external diameter, will cause the volumetric efficiency of compressor and the significantly rising of COP.

Known to those skilled in the art, the drawings and Examples of this creation only should not become the restriction in this creation understanding for function, structure and the principle that this creation is described; Simultaneously, the purpose of this creation all realizes.The foregoing description may be had some change under the situation that does not break away from this creation principle, so the protection of this creation should be as the criterion with the scope described in claims.

Claims

1. compressor with oval cylinder, this compressor comprises a cylinder, the blade groove of a pair of symmetric arrangement, a piston, an eccentric shaft, the rotating center of eccentric shaft overlaps with the center of cylinder, and a pair of Aspirating valves assembly, it is characterized in that:

The cross section of cylinder bore is oval.

2. compressor according to claim 1 is characterized in that this long axis of ellipse is near suction port.

3. compressor according to claim 2 is characterized in that transverse is preferably in each 10 degree scope of both sides with respect to the deflection angle of suction port.