KR100234758B1 - Scroll for scroll compressor and manufacturing method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll member and a manufacturing method of a scroll compressor, wherein a scroll member of a scroll compressor manufactured by using an Al-Si alloy as a material and having a composition of Si of 12 to 14%, which is a value of 10% or more, is made smaller. Wow; Melting Al, Si, Mg, Cu, Ti, and Sb at a predetermined composition ratio, and then spray molding and extruding to obtain a rod-like material, and the rod-like material obtained by the first step is heated in a semi-melt state. By then providing a scroll member manufacturing method of a scroll compressor, characterized in that it comprises a second step of putting in a mold of the scroll member shape by applying a constant pressure; Not only does it work well as a scroll member that has sufficient abrasion resistance, but it is also easy to manufacture due to its excellent workability, and is light and applicable to variable compressors. The problem of deterioration has been solved to improve the reliability of the compressor.

Description

Scroll member and manufacturing method of scroll compressor

The present invention relates to a scroll member and a manufacturing method of a scroll compressor, in particular, it has a sufficient wear resistance not only works as a scroll member, but also excellent in workability, easy to manufacture, light and applicable to a variable compressor, the coefficient of linear expansion is not large It relates to a scroll member and a manufacturing method of a scroll compressor that can improve the reliability of the compressor.

The general scroll compressor, as shown in FIG. 1, forms a main body and a hermetically sealed container 1, an upper frame 2 coupled to an upper side of the hermetic container 1, and the hermetic container ( The lower frame 3 coupled to the inner lower side of 1), and the stator (4) and the rotor (5) installed between the upper frame (2) and the lower frame (3).

And the center of the rotor (5) is coupled to the crankshaft (6) to rotate together in accordance with the rotation of the rotor (5), the fixed scroll (7) is fixed to the upper frame (2), The lower portion of the fixed scroll 7 is engaged with the pivoting scroll 8 so as to be pivotable, and the center portion of the lower portion of the pivoting scroll 8 is separated from the center of the crank shaft 6 with the upper end of the crank shaft 6. Are combined.

In addition, a rotation preventing mechanism 9 for preventing rotation of the turning scroll 8 is coupled to the lower side of the turning scroll 8. And the upper side of the fixed scroll (7) is coupled to the separating plate 10 for separating the inside of the sealed container (1) into the high pressure portion (M) and the low pressure portion (N), the separation plate 10 is installed to the lower side A refrigerant suction tube 11 is provided, and a discharge tube 12 through which the refrigerant gas compressed to the upper side where the separator 10 is installed is discharged. And the lower portion of the sealed container (1) is filled with oil (L) supplied to the sliding portion inside the scroll compressor.

Operation of the scroll compressor including each component as described above, first, when the rotor 5 is rotated by the applied current, the crank shaft 6 is rotated by the rotation of the rotor 5 crank The rotating scroll (8) coupled to the central portion of the lower portion eccentrically to the shaft (6) is to be orbital movement, and thus the orbiting scroll (8) is pivoting while the rotation is prevented by the rotation prevention mechanism (9). Due to the pivoting motion of the swinging scroll 8, a pocket, which is a compression space, is formed between the fixed scroll 7 and the swinging scroll 8 formed by the involute curve, respectively. The volume is reduced while moving to the center by the swinging movement to compress the refrigerant gas sucked into the suction port 7a and discharge it through the discharge port 7b.

The high pressure refrigerant gas discharged by the discharge port 7b is introduced into the high pressure part M through the discharge hole 10a formed in the separator 10, and the refrigerant gas introduced into the high pressure part M is discharge pipe 12. Is discharged through).

Among the various components of the scroll compressor operating as described above, the fixed scroll 7 and the swing scroll 8 may be collectively referred to as a scroll member. Such scroll members may be attached to the fixed scroll 7 of the swing scroll 8. Since the friction is continuously reciprocated through the rotational movement, and a gap occurs in the pocket due to the friction, the refrigerant leaks, so that the compression performance of the compressor is lowered and the reliability is lowered. Therefore, such scroll members need to have excellent wear resistance.

Accordingly, conventionally, a scroll member is made of gray cast iron, or one of the fixed scroll 7 and the turning scroll 8 is manufactured by using an Al-Si alloy material. As shown in Japanese Patent Application No. 6-50114, Al alloy containing 8-10% Si, 1.5-3% Cu, 0.05-0.15% Ti, and 0.1-0.2% Sb is obtained by high pressure solidification. Manufacturing may be mentioned.

However, the scroll members made of gray cast iron among the scroll members of the scroll compressor made of the above-described materials are difficult to be applied to the variable compressor due to the high processing cost due to the poor workability, the heavy weight, and excellent wear resistance and brittleness. There was a problem that was easy to break.

In addition, in the case of the conventional Al-Si alloy manufactured by the composition and method as described above, the size of primary Si particles is about 50 μm, which is excellent in abrasion resistance but poor in workability due to coarse particles, and also has a coefficient of linear expansion. 25 × 10 ^-6 / K Since the design has a large value, the tolerance of the compressor has to be increased, resulting in a decrease in the reliability of the compressor, such as a decrease in the performance of the compressor.

Accordingly, an object of the present invention created by recognizing the problems described above is a scroll member and a manufacturing method of a scroll compressor that can improve the reliability of the compressor because it is easy to manufacture, easy to manufacture, light, the coefficient of linear expansion is not large. It is to provide.

1 is a longitudinal sectional view of a typical scroll compressor.

2 is a flowchart illustrating a method of manufacturing a scroll member of a scroll compressor according to the present invention.

Figure 3 is a graph showing the test value comparing the wear resistance of the scroll member and the conventional scroll member made of gray cast iron of the scroll compressor according to the present invention.

(Explanation of symbols for the main parts of the drawing)

1; Airtight container 2; Upper frame

3; lower frame 4; stator

5; rotor 6; crankshaft

7; Fixed scroll 7a; Inlet

7b; discharge port 8; rotating scroll

9; anti-rotation device 10; separator

10a; vent hole 11; refrigerant suction pipe

12; discharge pipe L; oil

M; high pressure part N; low pressure part

R; wrap

In order to achieve the object of the present invention as described above, in the scroll member of the scroll compressor, the composition ratio of the scroll member is 12 to 14% for Si, 0.2 to 0.3% for Mg, 0.3 to 0.5% for Cu, and 0.05 for Ti. -0.1%, Sb is 0.1-0.2%, and the remaining component is Al, The scroll member of the scroll compressor is provided.

In addition, Si is 12 to 14%, Mg is 0.2 to 0.3%, Cu is 0.3 to 0.5%, Ti is 0.05 to 0.1%, Sb is 0.1 to 0.2%, and the remaining components are melted with Al, followed by spray molding. A first step of carrying out and extruding to obtain a rod-like material; And a second step of heating the rod-like material obtained by the first step in a semi-melt state and then putting the rod-like material into a mold having a scroll member to apply a predetermined pressure to form the scroll member. Is provided.

Hereinafter, the present invention will be described in detail with reference to the embodiments of the present invention.

The scroll member of the scroll compressor according to the present invention is made of an Al-Si alloy material, wherein the composition ratio is 12 to 14% of silicon (Si), 0.2 to 0.3% of magnesium (Mg), and 0.3 of copper (Cu). 0.5%, titanium (Ti) is 0.05-0.1%, tin (Sb) is 0.1-0.2%, and the remaining components are made of aluminum (Al).

If the amount of silicon is less than 10%, the coefficient of linear expansion is large, so that the amount of silicon is 12 to 14%, which is greater than 10%, and the amounts of other components copper, magnesium, titanium, and tin are conventional Al-Si alloys. Similar value as in

In order to manufacture the scroll member of the scroll compressor according to the present invention, the first process of melting the material to have the composition ratio and then spray forming and extrusion to obtain a rod-like material, The size of the Si particles of the rod-shaped material obtained through the first process is very fine and uniform to 2 μm or less.

Next, the second step of heating the rod-shaped material obtained by the first step in a semi-melt state and putting it in a mold having a scroll member shape under a constant pressure is performed, wherein the heating temperature of the rod-shaped material is 580 to 620 ° C. It is preferable that it is preferable that it is 2-5 kg / cm <^2> .

The size of the Si particles of the scroll member which has not been processed after being made by the second process is uniform to 10 μm or less, and the raw scroll member is processed to complete the scroll member of the scroll compressor.

2 is a flowchart illustrating a method of manufacturing a scroll member of a scroll compressor according to the present invention as described above.

On the other hand, Figure 3 is a graph showing the test value comparing the wear resistance of the scroll member of the scroll compressor and the conventional scroll member made of gray cast iron according to the present invention, the wear amount measured after operating the scroll compressor for three months under the same environment is gray cast iron It is shown that the scroll member made of the material is 5 µm and the scroll member according to the present invention is 6 µm, which shows sufficient wear resistance even in the scroll member according to the present invention.

The scroll member of the scroll compressor according to the present invention as described above not only functions well as a scroll member continuously friction with sufficient wear resistance, but also has excellent workability and is easy to manufacture, and is light and applicable to a variable compressor, and has a coefficient of linear expansion. The problem that the reliability of the compressor is deteriorated due to the large tolerance when designing is not large is solved, thereby improving the reliability of the compressor.

Claims (4)

In the scroll member of the scroll compressor, the composition ratio of the scroll member is 12 to 14% for Si, 0.2 to 0.3% for Mg, 0.3 to 0.5% for Cu, 0.05 to 0.1% for Ti, and 0.1 to 0.2% for Sb. Is Al, the scroll member of a scroll compressor. Si is 12 to 14%, Mg is 0.2 to 0.3%, Cu is 0.3 to 0.5%, Ti is 0.05 to 0.1%, Sb is 0.1 to 0.2%, and the remaining components are Al. A first step of extruding to obtain a rod-like material; And a second step of heating the rod-like material obtained by the first step in a semi-melt state, and then putting the rod-like material into a die having a scroll member shape and applying a predetermined pressure thereto to form the scroll member. The scroll member manufacturing method of a scroll compressor according to claim 2, wherein the heating temperature of the rod-like material during the second process is 580 to 620 占 폚. The scroll compressor is a scroll compressor, characterized in that the pressure applied for molding the rod-shaped material heated in the semi-melt state during the second process into the die of the scroll member shape, the molding is 2 to 5 kg / cm ² Member manufacturing method.

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