KR101386483B1 - Scroll compressor - Google Patents

Abstract

It relates to a hermetic compressor according to the present invention. In the scroll compressor of the present invention, the noise generated when the discharge valve is opened and closed is formed so that the range of the ratio of dividing the exclusion volume of the compression chamber divided by the cross-sectional area of the discharge port is approximately 0.15 ≦ α ≦ 0.45, thereby changing the condition of the refrigeration cycle to which the compressor is applied. Accordingly, even if the pressure ratio of the compressor changes, the noise generated when the refrigerant is discharged from the compression chamber of the compressor can be maintained at a constant level.

Pressure ratio, discharge port, excluded volume

Description

Hermetic compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly to a scroll compressor that can reduce the discharge noise.

Generally, a compressor is a device that converts mechanical energy into compressive energy of a compressive fluid. The compressor may be classified into a reciprocating type, a rotary type, a vane type, and a scroll type according to a method of compressing a fluid.

The scroll compressor is provided with a driving motor for generating power in an inner space of the sealed casing and a compression unit for compressing a refrigerant that is a compressive fluid by receiving power of the driving motor. The compression unit is composed of a fixed scroll is formed and the fixed scroll fixed to the casing, the rotating scroll is formed so that the rotating wrap is engaged with the fixed wrap, the rotating scroll. The fixed and the turning wraps have the same basic radius and are formed in the shape of one involute curve from the start angle to the end angle and are engaged with each other with a phase difference of 180 °.

In the scroll compressor as described above, the fixed wrap of the fixed scroll and the swing wrap of the swing scroll are engaged with each other to form two pairs of compression chambers while the swing scroll pivots with respect to the fixed scroll, and the compression chamber is a swing scroll. The volume is narrowed while moving to the center during the rotational movement of the refrigerant to continuously suck, compress and discharge the refrigerant. At this time, the ratio of the suction pressure and the discharge pressure of the scroll compressor is determined according to the operating conditions of the refrigeration cycle to which the scroll compressor is applied.

However, in the conventional scroll compressor as described above, although the noise is rapidly increased at a specific pressure ratio, a detailed analysis of the noise characteristics according to the change in the pressure ratio or an appropriate countermeasure based thereon has not been prepared yet. However, the degree of changing the shape of the discharge port, the shape of the discharge valve, or providing a sound absorbing material around the discharge port is only introduced.

The present invention solves the problems of the hermetic compressor including the conventional scroll compressor as described above, in consideration of the change in the noise characteristics according to the change in the pressure ratio to properly define the cross-sectional area of the discharge port to the compression volume to reduce the discharge noise It is an object of the present invention to provide a compressor.

In order to achieve the object of the present invention, the compression unit having a certain amount of exclusion volume; And a valve installed to open and close the discharge port of the excluded volume to limit the refrigerant discharged from the excluded volume, wherein a ratio α of dividing the excluded volume by the cross-sectional area of the discharge port is approximately 0.15 ≦ α ≦ 0.45. Provided is a hermetic compressor, characterized in that it is formed to be.

In the hermetic compressor according to the present invention, the noise generated when the discharge valve is opened and closed is specifically explained by defining the range of the ratio of the exclusion volume of the compression chamber divided by the cross-sectional area of the discharge port. Even if the pressure ratio of the filter is changed, the noise generated when the refrigerant is discharged from the compression chamber of the compressor can be maintained at a constant level.

Hereinafter, the hermetic compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

1 is a longitudinal sectional view showing an example of a scroll compressor in the hermetic compressor according to the present invention.

As shown in the drawing, the scroll compressor of the present invention includes a casing 10 in which a suction pipe SP and a discharge pipe DP communicate with each other, and a driving motor 20 installed above the casing 10 to generate rotational force. And a compression unit 30 installed above the casing 10 to receive the rotational force generated by the driving motor 20 to compress the refrigerant.

The drive motor 20 is a stator 21 fixed to the inside of the casing, a rotor 22 rotatably disposed inside the stator 21, and the rotor 22 is pressed into the rotor 22 to the rotational force It consists of a rotating shaft 23 to transmit. A coil 24 is wound around the stator 21 so that magnetic flux is formed by applying power from the outside, and a conductor (not shown) is formed on the rotor 22 together with the coil 24. ) Is inserted.

The compression unit 30 is fixed to the upper surface of the main frame 11 is fixed to the casing 10 and the fixed scroll 110 is formed with a fixed wrap 111 on the bottom surface, the fixed scroll 110 A pivoting scroll (121) provided with a pivoting wrap (121) to engage with the fixed wrap (111) of the plurality of compression chambers (P) to be pivotally mounted on an upper surface of the main frame (11), and the pivoting scroll It is installed between the 120 and the main frame 11 to open and close the Oldham's ring 130 and the discharge port 113 of the fixed scroll 110 to rotate while preventing the rotation of the swing scroll 120 It consists of a discharge valve 140. The discharge valve 140 is made of a cantilever-shaped reed valve whose one end is fixed to the fixed scroll 110, the opening of the discharge valve 140 on the compression back side of the discharge valve 140 Retaining retainers 141 are provided.

The fixed scroll 110 and the revolving scroll 120 are formed on the bottom and top surfaces of each of the hard plates so that the fixed wrap 111 and the revolving wrap 121 are engaged with each other. In addition, a suction groove 112 is formed on one side of the bottom surface of the fixed plate 110 so that the compression chamber P and the suction space S1 of the casing 10 communicate with each other, and the hard plate of the fixed scroll 110 is formed. A discharge port 113 is formed in the center of the portion such that the discharge side of the compression chamber P and the discharge space S2 of the casing 10 communicate with each other.

2 and 3, the discharge port 113 of the fixed scroll 110 corresponds to the exclusion volume B of the compression chamber, that is, the final compression chamber volume when the discharge is started. It is formed in a predetermined range. For example, the cross-sectional area A of the discharge port may be formed such that a ratio (α = B / A) obtained by dividing the exclusion volume B by the cross-sectional area A of the discharge port is in a range of about 0.15 ≦ α ≦ 0.45.

And the discharge port 113 of the fixed scroll 110 may be formed so that the diameter from the start end to the end is the same, in some cases is formed so as to increase the diameter toward the end or vice versa It may be. In this case, that is, when the diameter of the discharge port 113 is not the same from the start end to the end, the exclusion volume may be divided by the cross-sectional area of the intermediate height, and may be used as a reference for the proper ratio α for the discharge port.

In the drawings, reference numeral 12 denotes a subframe, and 13 denotes a high low pressure separator.

The scroll compressor of the present invention as described above has the following effects.

That is, when power is applied to the drive motor 20, the turning scroll 120 received the rotational force of the drive motor 20 by the old dam ring 130 by the eccentric distance from the upper surface of the main frame 11 You will be turning. The pair of compression chambers P continuously move between the fixed wrap 111 of the fixed scroll 110 and the pivoting wrap 121 of the pivoting scroll 120 while the pivoting scroll 120 is pivoting. ) Is formed, and the compression chamber (P) compresses the refrigerant sucked through the suction pipe (SP) while decreasing its volume while moving to the center by the continuous turning motion of the turning scroll (120). The refrigerant compressed in the compression chamber (P) is discharged through the discharge port 113 in the final compression chamber (P), that is, the exclusion volume (B), passes through the discharge space (S2), and then through the discharge pipe (DP). Transfer to the refrigeration system.

At this time, the discharge valve 140 is installed on the outlet side of the discharge port 113, when the compressed refrigerant is discharged from the compression chamber (P) hits the outlet side of the discharge port 113 and generates discharge noise. This discharge noise is not only slightly different depending on the pressure ratio of the compression chamber P, that is, the pressure ratio obtained by dividing the suction pressure by the discharge pressure, and the pressure ratio is changed depending on the conditions of the refrigeration cycle to which the compressor is applied. Therefore, when the exclusion volume B and the ratio α of the cross-sectional area A of the discharge port deviate from an appropriate range, the discharge noise may increase rapidly. 4 is a graph analyzed through experiments.

Here, the experimental pressure ratio is 76/297 psi (hereinafter, Experimental Example ①), 70/290 psi (hereinafter, Experimental Example ②), 90/370 psi (hereinafter, Experimental Example ③), 90/380 psi The case (hereinafter, Experimental Example ④) was examined as an example. Referring to this, when the ratio (α) of exclusion volume (cc) / cross-sectional area (mm2) per stroke is smaller than 0.15, the noise is significantly increased in Experimental Example ③ and Experimental Example ④, and the ratio (α) is larger than 0.15. It can be seen that the lower value in the range of less than 0.45 and then again increases out of 0.45. In Experimental Example ① and Experimental Example ②, but not as much as in Experimental Example ③ and Experimental Example ④ above, it can be seen that the noise is slightly increased when the noise is out of the above range.

In addition, FIG. 5 illustrates a case where the ratio α is 0.43 and 0.49 in the previous experiment. Referring to this, it can be seen that the ratio α is 0.49 in each of Experimental Example ①, Experimental Example ②, Experimental Example ③, and Experimental Example ④. In Experimental Example 4, the ratio (α) of 0.43 is almost unchanged, but it can be seen that 0.49 is greatly increased.

Therefore, it can be seen that the noise generated when the discharge valve 140 is opened and closed is significantly related to the ratio α of dividing the exclusion volume B of the compression chamber by the cross-sectional area A of the discharge port. By specifically demonstrating and defining the range of the ratio α, the noise generated when the refrigerant is discharged from the compression chamber of the compressor is changed to a certain level even if the pressure ratio of the compressor changes according to the change of the condition of the refrigeration cycle to which the compressor is applied. I can keep it.

The noise attenuation structure of the hermetic compressor according to the present invention can be equally applied to a compressor in which a reed valve is applied as a discharge valve as well as a rotary compressor as in the present embodiment.

1 is a longitudinal sectional view showing an example of the scroll compressor of the present invention;

2 is an exploded perspective view illustrating a discharge port and a discharge valve in the scroll compressor according to FIG. 1;

3 is a schematic view of the compression chamber shown to explain the ratio of the cross-sectional area of the discharge volume and the discharge volume in the scroll compressor according to FIG.

Figure 4 is a graph showing the noise distribution according to the change in pressure ratio by applying the ratio according to FIG.

FIG. 5 is a graph illustrating noise changes taking the case of the ratio α as 0.43 and 0.49 in the experiment according to FIG. 4.

DESCRIPTION OF REFERENCE NUMERALS

110: fixed scroll 113: discharge port

120: rotating scroll 140: discharge valve

A: Cross-sectional area of discharge port B: Excluded volume

α: Excluded volume / section of discharge port

Claims (4)

Compression unit having a certain amount of exclusion volume; And And a valve installed to open and close the discharge port of the excluded volume to limit the refrigerant discharged from the excluded volume. A hermetic compressor, wherein the ratio (α) of dividing the exclusion volume by the cross-sectional area of the discharge port is in a range of 0.15 ≦ α ≦ 0.45. The method according to claim 1, The valve is a hermetic compressor characterized in that the one end is fixed around the discharge port and the other end is a cantilever shape to open and close the discharge port while rotating around the fixed point. The method according to claim 1 or 2, The compression unit is a hermetic compressor comprising a fixed scroll and a rotating scroll to form a compression chamber in which the volume is narrowed while the fixed wrap and the swing wrap is continuously engaged in the center direction. The method according to claim 1 or 2, The compression unit is a hermetic compressor characterized in that it comprises a rolling piston which is pivoting in the compression space and the vane which is pressed against the rolling piston and the volume of the compression chamber is narrowed while performing a linear movement in accordance with the rotational movement of the rolling piston.

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