KR100678845B1 - Apparatus for surpressing noise of a scroll compressor - Google Patents

Abstract

The present invention relates to a noise reduction device of a scroll compressor, and in particular, a fixed casing (10) having a cylindrical casing (1) and a fixed wrap (11) having an involute-shaped fixed bottom (11) fixedly installed inside the casing (1). And an orbiting scroll (20) having an orbiting wrap (21) which forms a compression chamber (23) together with a fixed wrap (11) of the fixed scroll (10) on the upper surface, and the orbiting scroll (20) is eccentric. In the scroll compressor including a crank shaft (25) for coupling so as to drive the swinging scroll 20, the space portion 31 formed at a constant depth on the bottom surface of the swinging scroll (20) forming the compression chamber (23) ), A hydraulic plate 32 installed in the space part 31 so as to be movable up and down, and a spring 33 for elastically supporting the hydraulic plate 32 with respect to the bottom surface of the space part 31. will be.

When the over compression phenomenon occurs in the compression chamber 23 and the pressure in the compression chamber 23 excessively rises or varies, the hydraulic plate 32 receives the pressure of the compression chamber 23 and lowers the compression chamber 23. By increasing the volume of the space portion 31 in communication with each other, the pressure due to overcompression is accommodated. As a result, the volume of the compression chamber 23 is instantaneously increased at the moment compression occurs in the compression chamber 23, thereby reducing the abnormal noise due to the overcompression.

Scroll compressor, compression chamber, variable recess, hydraulic plate, diaphragm, over compression, noise

Description

Noise reduction device of scroll compressor {APPARATUS FOR SURPRESSING NOISE OF A SCROLL COMPRESSOR}

1 is a longitudinal sectional view of a scroll compressor equipped with a conventional noise reduction device;

2 is an enlarged cross-sectional view illustrating a structure of a conventional noise reduction device;

3 is a partially enlarged plan view of a conventional scroll provided with a fixed recess;

4 is a longitudinal sectional view of the scroll compressor equipped with a noise reduction device according to the present invention;

5 is an enlarged cross-sectional view of "B" in FIG. 4;

6 is an operating state diagram when the pressure in the compression chamber is a normal pressure as a first embodiment of the noise reduction device according to the present invention;

7 is an operation state diagram of the noise reduction device according to the present invention, an operation state diagram when the pressure in the compression chamber is an overcompression state,

Figure 8a is a view of a second embodiment of the noise reduction device according to the present invention, the operating state when the pressure in the compression chamber is a normal pressure,

8B is a view of another embodiment of the noise reduction device according to the present invention, which is an operating state diagram when the pressure in the compression chamber is in an overcompressed state.

※ Explanation of code for main part of drawing

1: casing 2: low pressure chamber

3: suction line 4: high pressure chamber

5: discharge tube 10: fixed scroll

11: fixed wrap 13: discharge passage

20: Turning Scroll 21: Turning Wrap

23: compression chamber 25: crankshaft

26: rotor 27: stator

30: variable recess portion 31: space portion

32: hydraulic plate 33: spring

34: diaphragm

The present invention relates to a noise reduction device of a scroll compressor, and more particularly, to an apparatus for reducing noise generated when overcompression occurs in a compression chamber formed by a swing scroll and a fixed scroll.

In general, a scroll compressor has an involute-shaped rotating wrap in which the orbiting scroll is pivoted by the crankshaft to form an involute-shaped compression chamber together with an involute-shaped fixed wrap of the fixed scroll. The volume of the compression chamber is gradually reduced while the eccentric rotation is performed by the rotation of the crank shaft to compress the fluid filled in the compression chamber, and when the constant compression ratio is reached, the compressed fluid is discharged through the discharge port.

Such a scroll compressor has a relatively high compression ratio compared to other types of compressors, while the suction-compression-discharge stroke is smoothly connected to obtain a stable torque. Hereinafter, the refrigerant gas of the air conditioning apparatus is described as an example of a fluid to be compressed for convenience of description, but the present invention is not limited thereto.

The scroll compressor as described above is generally provided with a cylindrical casing 101 having a discharge tube 105 through which compressed high-pressure refrigerant is discharged and a suction tube 104 through which refrigerant is sucked from the outside. And, the crank shaft 113 is disposed in the direction of the center axis of the casing 101 so that the upper and lower ends are rotatable to the main frame 116 and the lower frame 117 attached to the inner wall of the casing 101, respectively. Supported. The rotor 115 is fixed to the outer circumferential surface of the crank shaft 113 to rotate and receive the electromagnetic force from the stator 114 fixed to the inner wall of the casing 101 to rotate the crank shaft 113.

The fixed scroll 106 is fixed to the casing 101 and the rotating scroll 110 is disposed below the fixed scroll 106 to compress the refrigerant together with the fixed scroll 106 while performing an eccentric swing movement. The fixed scroll 106 is fixed to the casing 101 to form a high pressure chamber 102 on the upper side and a low pressure chamber 103 on the lower side, and has an involute-shaped fixing wrap 107 on the bottom. . The pivoting scroll 110 is provided with an involute pivoting wrap 111 forming an involute-shaped compression chamber 112 together with a fixed wrap 107 of the fixed scroll 106, the crank shaft The upper end of the 113 is eccentrically coupled with respect to the central axis of the crankshaft (113).

The crankshaft 113 is driven by the rotor 115 rotated by the stator 114 and the stator 114 on the side wall of the casing 101, and thus the crankshaft 113 rotates as a crank The high pressure chamber 102 through the discharge passage 109 provided in the fixed scroll 106 after compressing the refrigerant in the compression chamber 112 while the swing scroll 110 coupled to the tip of the shaft 113 eccentric swing movement To be discharged.

In addition, when overcompression occurs in the compression chamber 112, abnormal noise is generated due to the overcompression. In order to solve the overcompression phenomenon, the compression chamber 112 is illustrated in part “A” of FIG. 2. On the upper surface of the turning scroll 110 forming the bottom of the) is formed a recess 120 for accommodating the pressure variation according to the over-compression to increase the volume of the compression chamber 112 during the compression stroke.

By the way, as shown in FIGS. 2 and 3, the conventional recess 120 is formed to have a constant area and depth between the turning wraps 111 formed on the bottom surface of the turning scroll 110. Fixed type ".

Therefore, the recess 120 has the effect of eliminating the overcompression phenomenon and improving the noise and improving the compression performance under a certain compression condition, but since the area and depth are fixed and the volume is fixed, under the high pressure ratio or the variable pressure condition. A sufficient noise reduction effect could not be obtained.

Accordingly, an object of the present invention is to provide a noise reduction device for reducing an abnormal noise generated during overcompression under a high pressure ratio or a variable pressure condition by eliminating the disadvantage of the noise reduction device of the conventional scroll compressor.

The present invention for achieving the above object is to form a compression chamber together with a cylindrical casing, a fixed scroll is fixed to the inside of the casing, the bottom has a fixed wrap of the involute shape, and a fixed wrap of the fixed scroll on the upper surface In a scroll compressor including a swing scroll having a swing wrap, and a drive unit for driving the swing scroll by eccentrically combining the swing scroll,

One side of the compression chamber is characterized by a configuration including a variable recess for accommodating the pressure fluctuation of the compression chamber while the volume is variable according to the pressure of the compression chamber. The variable recess may be provided on one side wall of the fixed scroll that forms the compression chamber or on one side wall of the turning scroll.

The variable recess portion has a space portion formed at a constant depth on the bottom surface of either one of the swing scroll and the fixed scroll, and is installed at the entrance of the space portion and moves in the space portion in response to the pressure change of the compression chamber. It includes a moving hydraulic pressure means for varying.

The movable hydraulic pressure means includes a hydraulic plate installed to be movable up and down in the space portion, and a spring for elastically supporting the hydraulic plate against the bottom surface of the space portion.

In addition, the movable hydraulic pressure means is installed to cover the inlet of the space portion may be made of a diaphragm of stretch material.

According to the noise reduction device of the present invention configured as described above, when the overcompression occurs in the compression chamber and the pressure in the compression chamber increases above the set pressure, the moving hydraulic means moves to the space section under the pressure of the compression chamber, while By varying the volume of the compression chamber is changed to reduce the noise caused by overcompression.

Hereinafter, an embodiment of a scroll compressor according to the present invention will be described in detail with reference to the drawings.

Figure 4 is a longitudinal cross-sectional view of the scroll compressor according to the present invention, Figure 5 is an enlarged cross-sectional view showing a rotating scroll equipped with an embodiment of the noise reduction device according to the present invention, Figure 6 is shown in Figure 5 Figure 1 is a diagram showing a separate embodiment of the noise reduction device of the present invention.

As shown in FIG. 4, the scroll compressor includes a cylindrical casing 1 having a suction pipe 3 through which refrigerant is sucked from the outside, a discharge pipe 5 through which high pressure refrigerant is discharged, and an involute compression chamber 23. And a scroll assembly for compressing the low pressure refrigerant in the low pressure chamber 2 into a high pressure refrigerant and discharging the refrigerant to the high pressure chamber 4, and a driving unit for driving the scroll assembly.

The scroll assembly is composed of a fixed scroll (10) whose outer circumferential surface is tightly fixed along the circumference of the inner wall of the casing (1) and a rotating scroll (20) disposed opposite the fixed scroll (10), the fixed scroll 10 includes an involute-shaped fixing wrap 11 on its bottom surface. As shown in FIG. 5, the orbiting scroll 20 has an orbiting wrap 21 that forms a compression chamber 23 opposite to the stationary wrap 11 of the fixed scroll 10.

And, as shown in Figure 6, the swing scroll 20 is eccentrically coupled to the upper end of the crank shaft 25 disposed in the central axis direction of the casing 1 is fixed to the outer peripheral surface of the crank shaft 25 The electrons 26 are rotated by the rotational force transmitted from the stator 27 fixed to the inner wall of the casing 1.

That is, when power is applied to the stator 27, the rotor 26 rotates while receiving the electromagnetic force of the stator 27 to rotate the crankshaft 25 so as to be eccentrically coupled to the distal end of the crankshaft 25 ( 20) eccentric turning movement. As the turning scroll 20 performs the eccentric turning movement, the low pressure refrigerant of the compression chamber 23 is compressed at a high pressure between the fixed wrap 11 of the fixed scroll 10 and the turning wrap 21 of the turning scroll 20. After the discharge passage 13 is discharged to the high pressure chamber (4).

On the other hand, as shown in Figure 4, the bottom of the compression chamber 23 is provided with a variable recess 30, the volume of which varies in accordance with the pressure of the compression chamber 23. The variable recess 30 has an overcompressing phenomenon in the compression chamber 23 and increases the volume when the pressure in the compression chamber 23 increases, thereby accommodating the pressure increase due to overcompression. The sound is reduced.

As shown in FIGS. 5 and 6, the variable recess part includes a space part 31 and a space part formed at a predetermined depth on a bottom surface of the turning scroll 20 forming the compression chamber 23. 31 is installed in the inlet of the mobile hydraulic means for varying the volume of the space portion 31 while moving up and down in accordance with the pressure increase and decrease of the compression chamber (31).

As shown in FIG. 6, the movable hydraulic pressure means includes a hydraulic plate 32 installed in the space 31 so as to be movable up and down, and the hydraulic plate 32 of the space 31. It is composed of a spring 33 elastically supporting the bottom surface.

Therefore, when the normal compression occurs in the compression chamber 23 to maintain a constant pressure, as shown in FIG. 6, the force F and the compression chamber of the spring 33 supporting the hydraulic plate 32 at the lower portion thereof. The pressure P of 23 is balanced, and the hydraulic plate 32 is maintained to be substantially horizontal with the bottom surface of the compression chamber 23.

Then, in the case of so-called overcompression in which an overcompression phenomenon occurs in the compression chamber 23 and the pressure P of the compression chamber 23 excessively rises or a pressure fluctuation occurs, as shown in FIG. 7, the compression chamber The pressure P of the 23 is greater than the force F of the spring 33 supporting the hydraulic plate 32 so that the hydraulic plate 32 is the pressure P of the compression chamber 32 and the spring force F. The pressure of the overcompression is accommodated by increasing the volume of the space 31 while descending to the inside of the space 31 by the difference of. As a result, the volume of the compression chamber 23 is instantaneously increased at the moment compression occurs in the compression chamber 23, thereby reducing the abnormal noise due to the overcompression.

On the other hand, as shown in Figure 8a and 8b of another embodiment of the mobile hydraulic means, it has a structure in which the diaphragm 34 of the elastic material is attached to the inlet of the space 31.

In this embodiment, when the pressure in the compression chamber 23 maintains the normal pressure, as shown in FIG. 8A, the diaphragm 34 blocks the inlet of the space 31 almost horizontally, and then the compression chamber ( In the case where the overcompression phenomenon occurs at 23 and the pressure in the compression chamber 23 is excessively increased or varied, as shown in FIG. 8B, the diaphragm 34 receives the pressure from the compression chamber 23 and is spaced. Deformation into the interior of the 31 increases the volume of the space portion 31 in communication with the compression chamber 23 to accommodate the pressure due to overcompression. As a result, the volume of the compression chamber 23 is instantaneously increased at the moment compression occurs in the compression chamber 23, thereby reducing the abnormal noise due to the overcompression.

In the above embodiments, the variable recessed portion has been described in that the bottom surface of the turning scroll 20 constituting one side wall of the compression chamber 23, the present invention is a fixed scroll constituting the other side wall of the compression chamber It is also possible to comprise so that it may be provided in the side wall or bottom surface of (10).

According to the noise reduction device of the present invention configured as described above, when the overcompression occurs in the compression chamber and the pressure in the compression chamber increases above the set pressure, the moving hydraulic means moves to the space section under the pressure of the compression chamber, while By varying the volume of the compression chamber is changed to reduce the noise caused by overcompression.

Claims (6)

A cylindrical casing (1), a fixed scroll (10) fixedly installed in the casing (1) and having an involute fixed wrap (11) at its bottom, and a fixed wrap of the fixed scroll (10) on an upper surface thereof (11) and a swing scroll (20) having a swing wrap (21) to form a compression chamber (23), and a driving unit for driving the swing scroll (20) by eccentrically coupling the swing scroll (20). In scroll compressors, It includes a variable recess on one side wall of the compression chamber 23 to accommodate the pressure fluctuation while changing the volume according to the pressure of the compression chamber 23, The variable recess 30 includes a space 31 formed at a predetermined depth in the fixed scroll 10 or the swing scroll 20 forming the compression chamber 23, and the entrance of the space 31. Noise reduction device of the scroll compressor, characterized in that it comprises a moving hydraulic means for varying the volume of the space portion 31 while moving in accordance with the pressure change of the compression chamber (23). The noise reduction device of claim 1, wherein the variable recess is provided on one inner side wall of the swing scroll (20). The noise reduction apparatus of claim 1, wherein the variable recess is provided at one inner side wall of the fixed scroll (10). delete According to claim 1, wherein said moving hydraulic means is a hydraulic plate 32 is installed so as to be movable up and down in the space portion 31, the hydraulic plate 32 is elastically with respect to the bottom surface of the space portion (31) Noise reduction device of the scroll compressor, characterized in that made of a spring (33) to support. The noise reduction device of claim 1, wherein the movable hydraulic pressure means is installed to cover the inlet of the space part 31 and is made of a stretchable diaphragm 34.

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