KR100202893B1 - Low noise and vibration case structure of a hermetic compressor - Google Patents

Abstract

The present invention relates to a low-noise and low-vibration case structure of a hermetic compressor for reducing noise and vibration caused by a high-pressure generating part in a hermetic compressor having a means for using a refrigerator and sucking and discharging a refrigerant into a closed casing.

The present invention is a compressor in which a high-pressure generating means composed of a cylinder, a piston, a valve or the like is mounted inside a closed casing (21) of a cylinder structure in which upper and lower divided cans are welded: The side sound absorbing plate 22 and the top surface sound absorbing plate 23 are joined to form a space portion of a predetermined gap Q at a predetermined position; A plurality of micropores 22a are formed through the side surface sound absorbing plate 22 and the top surface sound absorbing plate 23, A porous sound absorbing material 24 is inserted into the space portions of the side sound absorbing plate 22 and the top surface sound absorbing plate 23.

Accordingly, it is an object of the present invention to provide a hermetic compressor, which is used in a refrigerator and has a means for sucking and discharging refrigerant in a sealed case, and by adhering a plurality of sound insulating plates to the sealed case, .

Description

Low Noise and Low Vibration Case Structure of Hermetic Compressor

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor, and more particularly, to a hermetic compressor having a means for sucking and discharging a refrigerant in a sealed case used in a refrigerator, And a low vibration case structure.

BACKGROUND ART In a refrigerator, a compressor is a means for converting a rotational force due to electrical energy into a mechanical energy of reciprocating motion, and a refrigerant having a low boiling point is put into a high pressure state of about 12 atmospheres while passing through the compressor. The high-pressure refrigerant is cooled in the condenser to be in a liquid state. When this liquid-state refrigerant is vaporized in the cooler, one refrigeration cycle is completed.

FIG. 1 is a front view schematically showing an internal configuration of a hermetic compressor.

The compressor 10 includes a high pressure generating means which is connected to a suction pipe (not shown) and a discharge pipe (not shown) of a refrigerant to the outside of the closed casing 11 and is driven by a motor 18 constituted by a stator and a rotor It is a mounted structure. The high pressure generating means constituted by the cylinder 13, the piston 14 and the valve 15 is mounted on the frame 17 so that the shaft 12 rotated by the motor 18 is rotated by the eccentric cam And the cam movement again reciprocates the piston 14 in the cylinder 13 through the connecting rod and the valve 15 is open and closed by the pressure difference between both sides formed at this time to move the refrigerant in one direction .

In the hermetic compressor having the high-pressure generating means, the refrigerant introduced into the suction pipe flows into the cylinder 13 through a suction muffler (not shown) after being filled in the closed casing 11, and the refrigerant compressed in the cylinder 13 flows Passes through the discharge muffler 16 and is sent to a condenser (not shown) through an exhaust pipe.

At this time, the suction muffler and the discharge muffler 16 are used to reduce the noise of the compressor occupying most of the refrigerator operating noise. In particular, it is effective to reduce the fluid noise as the refrigerant flows at high speed in the compressor.

However, in addition to the fluid noise as described above, the high-pressure generating means causing the noise also generates machine noise such as noise due to friction between the cylinder 13 and the piston 14, noise due to impact upon opening and closing of the valve 15, The mechanical noise generated by the high pressure generating means is generated by the refrigerant filled in the sealed case 11 as the first medium and the refrigerant filled in the sealed case 11, As a second medium.

Since the machine noise is transmitted directly to the outside through the enclosure 11 rather than being transmitted along the flow path of the refrigerant, there is a limit in reducing the noise by the suction muffler and the discharge muffler 16 described above. The propagation function is weakened and the transmission of the noise through the closed case 11 can be blocked.

The mechanical noise such as noise due to friction between the cylinder 13 and the piston 14 and noise due to an impact upon opening and closing the valve 15 in the high-pressure generating means is a kind of vibration induced noise, Can be reduced to some extent.

Accordingly, it is an object of the present invention to provide a low-noise and low-vibration case structure of a hermetic compressor for reducing noise and vibration caused by a high-pressure generating portion in a hermetic compressor having a means for use in a refrigerator and sucking and discharging refrigerant in a closed casing .

1 is a front view schematically showing an internal configuration of a hermetic compressor;

FIG. 2 is a schematic front view of a compressor for indicating the mounting position of the soundproof plate according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: compressor 11: sealed case (conventional)

12: shaft 13: cylinder

14: piston 15: valve

16: discharge muffler 17: frame

18: motor 19: spring

21: sealed case (present invention) 22: side sound insulating plate

22a: fine hole 22b: bent portion

22a: upper surface soundproofing plate 24: sound absorbing material

Q: Niche

In order to achieve the above object, the present invention provides a compressor in which a high-pressure generating means composed of a cylinder, a piston, a valve or the like is mounted in a sealed casing (21) (22) and the upper surface of the sound insulation plate (23) are joined to each other with a predetermined gap (Q) at a predetermined position where the amplitude of the vibration is large; A plurality of micropores 22a are formed through the side surface sound absorbing plate 22 and the top surface sound absorbing plate 23, And a porous sound absorbing material (24) is inserted into the space portions of the side sound insulation plate (22) and the top side sound insulation plate (23).

At this time, the side sound absorbing plate 22 is divided into upper and lower parts and bonded to a plurality of points on the inner side surface of the closed case 21, and the upper side sound absorbing plate 23 is bonded to the inner upper surface of the closed case 21 near the center .

[Example]

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIG. 2 attached hereto.

1, the present invention is characterized in that a high-pressure generating means constituted by a cylinder 13, a piston 14, a valve 15, and the like is mounted inside a closed casing 11 of a tubular structure in which upper and lower divided cans are welded To the compressor (10).

Vibrations generated in the compressor 10 having various vibration sources such as the eccentric motion of the shaft 12, the reciprocating motion of the piston 14 and the opening and closing motion of the valve 15 are transmitted to the spring 19 supporting the frame 17 The resonance frequency of the sealed case 11 is measured to be in the range of approximately 2000 to 4000 Hz when the number of revolutions of the motor 18 is 3600 rpm.

On the other hand, the compressor 10 is installed as a rear end inside the refrigerator. In the refrigerator, since it is a major source of vibration as well as operating noise, the refrigerator has an appropriate dustproof structure. The compressor 10 has a dustproof structure that is mounted on a refrigerator frame via a circular rubber (not shown) in a plurality of brackets fixed to the outer lower end of the enclosure 11.

FIG. 2 is a schematic front view of a compressor for indicating the mounting position of the soundproofing plate according to the present invention.

The closed case 21 of the present invention forms a space portion of a predetermined clearance Q at a predetermined position where the amplitude of vibration is large and the side sound absorbing plate 22 and the top side sound absorbing plate 23 are bonded.

The side surface sound absorbing plate 22 and the top surface sound absorbing plate 23 are formed by bending the periphery of a circular or rectangular plate to maintain a predetermined gap Q to form a bent portion 22b and then welding the same to the closed case 21 I have. Since the space portion formed by the predetermined gap Q does not require airtightness, the full circumference welding is unnecessary.

At this time, the side sound absorbing plate 22 is divided into upper and lower parts and bonded to a plurality of points on the inner side surface of the closed case 21, and the upper side sound absorbing plate 23 is bonded to the inner upper surface of the closed case 21 near the center .

When the vibration mode of the compressor enclosure 21 is measured on the X-axis, the Y-axis and the Z-axis, respectively, the upper case having the high-pressure generating portion is larger than the lower case having the refrigerant- The largest maximum displacement point appears. This maximum displacement point depends on the type of the compressor, the characteristics of the spring 19 (first figure) installed in the closed casing 21, the characteristics of the circular rubber provided on the outside of the closed casing 21, do.

The stiffness of the sealing case 21 is increased and the spring constant is changed by joining the side sound insulation plate 22 and the top side sound insulation plate 23 to the maximum displacement point. Outside the resonance frequency of the range, the amplitude of the vibration is reduced.

That is, conventionally, the spring 19 (first drawing) provided inside the closed casing 21 is used as the first vibration preventing means and the circular rubber (not shown) provided on the outside is used as the second vibration preventing means. It is also possible to have a third anti-vibration means such as the side sound insulation plate 22 and the upper sound insulation plate 23.

In addition, a plurality of micropores 22a are formed on the side surface sound absorbing plate 22 and the top surface sound absorbing plate 23 of the present invention.

In general, the space formed between the closed case 21 and the clearance Q is communicated with the external noise source through the fine holes 22a, so that the noise reduction effect can be expected. The dimensions such as the dimension of the gap Q, the diameter of the fine holes 22a, and the forming interval are preferably determined through explanations.

A porous sound absorbing material 24 is inserted into the space portions of the side sound absorbing plate 22 and the top surface sound absorbing plate 23.

Generally, the sound absorbing material is made of glass fiber or asbestos, and the amount of noise reduction is increased as the micropores 22a have porosity such that the minute spaces communicate with each other. It should be noted, however, that the temperature of the refrigerant in the compressor rises because the sound absorbing material also functions to a certain degree of insulation.

Although the above embodiment has been described with respect to the installation of the side sound insulation plate 22 and the top side sound insulation plate 23 based on the measurement result of the vibration mode, the vibration mode is measured again after the first sound insulation plates 22 and 23 are installed It is preferable to additionally attach to a portion having a predetermined sound pressure degree or amplitude or more.

On the other hand, increasing the total thickness of the enclosure 21 to reduce vibrations and noise requires a high-capacity press machine, and also increases the overall weight of the compressor. In the present invention, however, Attachment minimizes such disadvantages.

As described above, the low-noise and low-vibration case structure of the hermetic compressor of the present invention is used in a refrigerator and has a means for sucking and discharging refrigerant into a sealed case. In the hermetic compressor, There is an effect of reducing noise and vibration caused by the high-pressure generating portion in the case.

Although the present invention has been shown and described with respect to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as set forth in the following claims Those skilled in the art will readily know what is known in the art.

Claims (2)

A high pressure generating means composed of a cylinder, a piston, a valve, or the like is mounted inside a closed casing 21 having a tubular structure in which upper and lower split cans are welded, the compressor comprising: a casing 21 having a predetermined amplitude And the side surface sound insulation plate 22 and the top surface sound insulation plate 23 are bonded to each other; A plurality of micropores 22a are formed through the side surface sound absorbing plate 22 and the top surface sound absorbing plate 23, Wherein a porous sound absorbing material (24) is inserted into the space portions of the side sound absorbing plate (22) and the top surface sound absorbing plate (23). The soundproof panel according to claim 1, wherein the side surface soundproofing panel is divided into upper and lower parts and joined to a plurality of points on the inner side surface of the enclosure. And the low-noise and low-vibration case structure of the hermetic compressor.