JP2695177B2 - Scroll machine blades - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll machine used as a scroll scroll compressor such as a refrigeration scroll compressor such as an air conditioner and a refrigerator and a pump.

2. Description of the Related Art A compression mechanism of a scroll compressor will be described with reference to FIGS. 2 and 3.

The rotary motion of the crankshaft 5 accompanying the rotation of the electric motor element 4 is transmitted to the swirl spiral vane component 8 via the eccentric bearing 11 and the swirl spiral vane shaft 12, but by the action of the rotation restraint component 13, the swirl spiral vane component. 8 does not rotate, but makes a swivel motion with the center of the involute or similar curve of the fixed spiral blade component 7 as the swivel center.

At this time, the winding end end of the blade 8a of the swirling spiral blade component 8
The suction is completed when 8a 'is in contact with the vane 7a of the fixed spiral vane component 7 and the winding end 7a' of the vane 7a of the fixed spiral vane component 7 is in contact with the vane 8a of the swirling spiral vane component 8, respectively.

Then, along with the revolution movement of the swirling spiral blade component 8, the blade
As the two contact points between the blade 7a and the blade 8a approach the center of the involute, the pressure in the compression chamber 9 rises and is discharged from the discharge port 26.

 Next, the shape of the tip of the blade will be described.

As shown in FIG. 4, the scroll type compressor has a chamfer 7 at the tip of the blade of the fixed and orbiting spiral vane components 7, 8.
c and 8c are provided. When used as a compressor,
The ideal shape is, as shown in FIG. 5, end plates 7b, 8b and blades 7.
It is desirable that the sealing surfaces of a and 8a move relative to each other without a gap, but with the current molding technology, the blades 7a and 8a and the end plates 7b and 8b are
It is difficult to make the tangent line of the ideal shape.

Therefore, at the intersection of the blades 7a, 8a and the end plates 7b, 8b, the sixth
As shown in the figure, a slight protrusion 27 remains when processing the blade side surface and the end plate portion, and it is necessary to provide a chamfer at the blade tip to avoid the interference between the blade top end and the side edge line part. There is.

Problem to be Solved by the Invention Blades 7a, 8a and mirror plates 7b, 8b including a slight protrusion of the tangent of blades 7a, 8a and mirror plates 7b, 8b and blades 7a, a gap 28 surrounded by chamfers at the tip of 8a is small Although it is easy to understand that gas or liquid leaks less and the efficiency is improved, the blade tip chamfer cannot be made extremely small in consideration of the guarantee of the protrusion 27 on molding.

Further, even if it is possible to reduce the chamfering of the tips of the blades 7a, 8a, especially in the assembly of the compressor in manufacturing, since the upper end of the winding end of the blade is exposed to the outside,
If any collision or contact with an external object occurs, deformation due to a dent or the like is likely to occur. If the chamfered tip of the blades 7a, 8a is deformed due to dents, etc., the blades 7a, 8a and the end plate
The compression chamber 9 constituted by 7b and 8b is deformed as shown in FIGS. 7 (a) and 7 (b) due to deformation due to a dent or the like, and leakage of gas or fluid increases.

In addition, due to deformation, between the end plate 7b, 8b and the blade 7a, 8a of the fixed spiral vane component 7 and the swirl spiral vane component 8,
Extreme contact may occur, resulting in abnormal noise or abnormal wear, and in the worst case, the inside of the compressor or the pump may be destroyed.

The present invention solves the above-mentioned problems, practically reduces the leakage from the tangent portion between the blade and the end plate, and the gap 28 surrounded by the chamfering of the blade tip, and practically prevents the deformation of the blade tip due to a dent or the like. The purpose is to eliminate the phenomena such as leakage reduction, abnormal noise, abnormal wear, and destruction.

Means for Solving the Problems In order to achieve this object, the present invention provides a scroll machine in which at least one of the fixed spiral blade and the swirl spiral blade is provided with a chamfer, and the chamfer has a large chamfer. That is, the fixed spiral blade or the swirl spiral blade is formed so as to be larger at the end of winding and smaller at the beginning of winding.

Action As described above, in the compression mechanism of the scroll compressor, the pressure in the compression chamber 9 increases as it approaches the center. Therefore, the closer to the center, the larger the pressure difference with the adjacent compression space.

Therefore, it is necessary to reduce the chamfer size of the blade tip at the beginning 30b of the blade because it has a large effect on efficiency, but the deformation due to the dents on the tip of the blade is mainly at the end 30a of the blade winding. At the end 30a of the blade, by increasing the chamfer size of the blade tip, it is possible to prevent the blade tip from being deformed due to dents, etc., and easy to handle in manufacturing. Become. However, at the blade end 30a, the pressure of the adjacent compression is small, and the influence on the efficiency is very small.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, a schematic structure of a general hermetic scroll compressor including the present invention will be described with reference to FIG.

In the figure, an electric motor element 4 composed of a stator 2 and a rotor 3 and a compressor element 6 driven by a crankshaft 5 by the electric motor element 4 are arranged inside a closed container 1. Fixed spiral blade part 7 and swirl spiral blade part 8
Mesh with each other to form a plurality of compression chambers 9,
Is driven by the crankshaft 5, the eccentric bearing 11, and the swirling spiral blade shaft 12.
Is transmitted and the swirling spiral blade component 8 swirls. The swirling spiral blade component 8 is restrained from rotating by a rotation restraining component 13.

The refrigerant gas that has entered the closed container 1 through the suction pipe 24 is sucked into the compressor element 6 through the suction port 25, compressed by the compressor 9 and discharged through the discharge port 26.

FIG. 1 is a detailed view of a swirling spiral blade component for explaining an example of the present invention.

The swirling spiral blade component 8 is composed of an end plate 8b and a spiral blade 8a. Further, chamfers 8c are provided at both corners of the tip of the blade 8a. Regarding the degree of chamfering, the chamfering degree is large at the winding end 30a of the blade that is the winding end, and is small at the winding start 30b of the blade that is the winding start. As for this degree, the chamfering degree gradually changes in a series from the winding start to the winding end of the blade.

In the above-mentioned configuration, when the pressure assembly machine is driven, the compression chamber 9
The pressure rises as it approaches the center of the spiral,
The pressure difference between the adjacent compression chambers increases. Therefore, at the blade start 30b, the effect on efficiency is large,
It is necessary to reduce the chamfer size of the blade tip,
Deformation due to dents on the tip of the blade is mainly due to the end of the winding
30a, which does not cause any obstacles. Further, at the end 30a of the blade winding, by increasing the chamfered size of the blade tip, it is possible to prevent the blade tip from being deformed due to a dent or the like, which facilitates the handling in manufacturing. However, at the winding end 30a of the blade, the pressure difference between the adjacent compression chambers is small and the influence on the efficiency is very small.

In addition, the chamfer size of the blade tip is divided into blocks in which the winding angle of the blade is fixed, and chamfering is performed step by step so that the blade winding end 30a is larger and the blade winding start 30b is smaller for each block. However, the same effect can be obtained.

In any of the examples, molding can be performed with a processing facility using a cam, a gear, or NC, but particularly in the case of a processing facility using NC, it is easy to adjust the chamfer formation of the blade tip.

Further, although the swirling spiral blade component 8 has been described in the present embodiment, it goes without saying that the fixed spiral blade component 7 can be similarly implemented.

Furthermore, although the present embodiment has been described as a scroll compressor, it goes without saying that it can be similarly implemented as a machine such as a pump or an expander.

As described above, according to the present invention, in the scroll machine, at least one of the fixed spiral blade and the swirl spiral blade is provided with a chamfered portion, and the chamfered size of the chamfered portion is By forming the fixed spiral blade or the swirling spiral blade so that it is larger at the end of winding and smaller at the beginning of winding, a highly efficient compressor or pump with less leakage could be realized. In addition, since it is possible to prevent deformation due to dents on the upper edge of the blade, it is possible to significantly improve productivity, reduce cost, and make abnormal noise.
It is possible to improve reliability with respect to items such as abnormal wear and mechanical breakdown.

[Brief description of the drawings]

FIG. 1 is a perspective view of a swirling spiral blade of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a hermetic scroll compressor, and FIG. 3 is a fixed and swirling spiral blade of the compressor. FIG. 4 is an assembly view, FIG. 4 is a vertical cross-sectional view of a spiral vane portion showing a conventional example, and FIG. 5 is a vertical cross-sectional view showing a spiral vane portion of an ideal shape.
FIG. 6 is a vertical cross-sectional view of a general spiral blade portion, FIG. 7 (a)
(B) is a vertical cross-sectional view of another example in which the conventional blade is deformed. 1 ... airtight container, 2 ... stator, 3 ... rotor, 4 ...
Electric motor element, 5 ... Crankshaft, 6 ... Compressor element, 7
...... Fixed spiral blade parts, 7a ...... Wings, 7b ...... End plate, 8 ...
… Swirl spiral blade component, 8a …… Blade, 8b …… End plate, 8c ……
Chamfer, 9 ... Compression chamber, 11 ... Eccentric bearing, 12 ... Swirl spiral vane shaft, 13 ... Spinning restraint parts, 30a ... End of winding, 30b ... Start of winding of blade.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanobu Seki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References: 62-82391 (JP, U) 76185 (JP, U)

Claims (1)

(57) [Claims] 1. A fixed spiral vane fixed to a housing, having a first end plate and a first spiral part projecting from one surface of the first end plate, and facing the fixed spiral vane. A second end plate disposed on the second end plate and a second end plate that is provided on the second end plate so as to project from the second end plate and meshes with the first spiral part at a different angle to form a space between the second end plate and the first spiral part. A swirling spiral blade having a swirl portion and a drive mechanism for causing the swirling spiral blade to perform a swirling motion around the center of the fixed swirl blade while preventing rotation of the swirling swirl blade, compressing fluid by the swirling motion of the swirl spiral blade or In a scroll machine for sucking, at least one of the fixed spiral blade and the swirling spiral blade is provided with a chamfer, and the chamfer of this chamfer is larger as the end of winding the fixed spiral blade or the swirl spiral blade. ,roll Started as small so as it forms the scroll machine of the blade.