KR19980037775A - Low noise and low vibration case structure of 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 the high-pressure generator in a hermetic compressor having a means used for a refrigerator and having a means for sucking and discharging the refrigerant inside the hermetic case.

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 inside a sealed case 21 of a tubular structure in which upper and lower divided cans are welded: The closed case 21 has a large amplitude of vibration. The side sound insulation board 22 and the top sound insulation board 23 are joined to each other to form a space portion of a predetermined gap Q at a predetermined position; A plurality of micropores 22a penetrate through the side sound insulation board 22 and the top sound insulation board 23; The porous sound absorbing material 24 is inserted into the space portion of the side soundproofing plate 22 and the top soundproofing plate 23.

Accordingly, the present invention has the effect of reducing the noise and vibration caused by the high-pressure generating unit in the sealed case by attaching a plurality of soundproof plates in the sealed case in a hermetic compressor having a means used for a refrigerator and having a means for sucking and discharging the refrigerant inside the sealed case. There is.

Description

Low noise and low vibration case structure of hermetic compressor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly, to low noise of a hermetic compressor for reducing noise and vibration caused by a high pressure generator in a hermetic compressor having a means used for a refrigerator and having a means for sucking and discharging a refrigerant inside the hermetic case. And a low vibration case structure.

In a refrigerator, a compressor is a means for converting rotational force due to electrical energy into mechanical energy of reciprocating motion, and a refrigerant having a low boiling point is brought to a high pressure of about 12 atm as it passes through the compressor. Again, the high pressure refrigerant is cooled in the condenser to become liquid, and once this liquid refrigerant is gasified in the cooler, one refrigeration cycle is completed.

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

Compressor 10 has a high-pressure generating means is coupled to the suction pipe (not shown) and the discharge pipe (not shown) of the refrigerant outside the sealed case 11 and driven by a motor 18 composed of a stator and a rotor therein. It is mounted structure. The high-pressure generating means composed of the cylinder 13, the piston 14, the valve 15, and the like is mounted on the frame 17, wherein the shaft 12 rotated by the motor 18 has an eccentric cam motion thereon. And the cam motion reciprocates the piston 14 in the cylinder 13 through the connecting rod again, and the valve 15 is passively opened 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 such a high pressure generating means, the refrigerant introduced into the suction pipe is filled into the sealed case 11 and then introduced into the cylinder 13 through a suction muffler (not shown), and the refrigerant compressed in the cylinder 13 It carries a discharge muffler 16 and is sent to a condenser (not shown) via a discharge pipe.

In this case, the suction muffler and the discharge muffler 16 are used to reduce the compressor noise, which occupies most of the operation noise of the refrigerator. In particular, the suction muffler and the discharge muffler 16 are effective in reducing fluid noise due to the flow of the refrigerant at a high speed in the compressor.

However, in addition to the fluid noise as described above, the high-pressure generating means, which is a source of noise, also generates mechanical noise such as noise caused by friction of the cylinder 13 and the piston 14 and noise caused by impact when opening and closing the valve 15. Since the sound wave having a predetermined amplitude and frequency proceeds in the medium, the mechanical noise generated by the high pressure generating means is a refrigerant filled in the sealed case 11 as the first medium and the sealed case 11. It is delivered directly to the outside as a second medium.

Since such mechanical noise is directly transmitted to the outside through the sealed case 11 rather than along the flow path of the refrigerant, there is a limit to the reduction by the above-described suction muffler and discharge muffler 16, and the By weakening the radio wave function it can block the transmission of the noise through the sealed case (11).

In addition, mechanical noise such as noise caused by friction of the cylinder 13 and the piston 14 and noise caused by impact when opening and closing the valve 15 in the high pressure generating means is suitable as a kind of vibration-induced noise. The dust can be reduced to some extent.

Accordingly, an object of the present invention is 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 unit in a hermetic compressor having a means used for a refrigerator and having a means for sucking and discharging a refrigerant inside a sealed case. It is done.

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

Figure 2 is a schematic front view of a compressor for showing the mounting position of the sound insulation plate according to the invention.

* Explanation of symbols on the main parts of the drawings

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 ( The present invention), 22: side sound insulation pipe, 22a; Fine hole, 22b: bend, 23: top sound insulation board, 24: sound absorbing material, Q: gap

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, and the like is mounted in a sealed case 12 having a cylindrical structure welded up and down cans: the sealed case 21. Is a space portion of a constant gap Q at a predetermined position where the amplitude of vibration is large, and the side sound insulation board 22 and the top sound insulation board 23 are joined; A plurality of micropores 22a penetrate through the side sound insulation board 22 and the top sound insulation board 23; A low noise and low vibration case structure of a hermetic compressor is provided in the space portion of the side soundproofing plate 22 and the top soundproofing plate 23.

At this time, the side sound insulation plate 22 is divided up and down in the inner side of the sealed case 21 and bonded to a plurality of points, the top soundproof plate 23 is bonded to the central portion in the inner upper surface of the sealed case 21. .

EXAMPLE

Hereinafter, with reference to the accompanying Figure 2 will be described a preferred embodiment of the present invention.

1, the present invention is a compressor in which a high-pressure generating means composed of a cylinder 13, a piston 14, a valve 15, or the like is mounted inside a sealed case 11 of a cylindrical structure in which upper and lower split cans are welded. Applies to (10).

Vibration generated by the compressor 10 having various vibration sources such as an eccentric motion of the shaft 12, a reciprocating motion of the piston 14, and an opening / closing motion of the valve 15 is applied to the spring 19 supporting the frame 17. After being reduced to some extent, it is transmitted to the sealed case 11, and when the rotational speed of the motor 18 is 3600 rpm, the resonance frequency of the sealed case 11 is measured to be in the range of approximately 2000 to 4000 Hz.

On the other hand, the compressor 10 is installed in the rear end of the refrigerator, because the refrigerator is not only the operation noise but also a main source of vibration has a proper dustproof structure. The compressor 10 adopts a dustproof structure that is mounted on a refrigerator frame via a circular rubber (not shown) in a plurality of brackets fixed to an outer lower end of the sealed case 11.

2 shows a schematic front view of a compressor for indicating a mounting position of a sound insulation board according to the invention.

The sealed case 21 of the present invention forms a space portion of a constant gap Q at a predetermined position where the amplitude of vibration is large, and the side sound insulation plate 22 and the top sound insulation plate 23 are joined.

The side sound insulation board 22 and the top sound insulation board 23 are formed by bending the peripheral portions of the circular or rectangular plates to maintain a predetermined gap Q to form the bent portions 22b, and then welding them to the sealed case 21. Have Since the space portion formed by the predetermined gap Q does not require airtightness, the whole circumference welding is unnecessary.

At this time, the side sound insulation plate 22 is divided up and down in the inner side of the sealed case 21 and bonded to a plurality of points, the top soundproof plate 23 is bonded to the central portion in the inner upper surface of the sealed case 21. .

When the vibration mode of the compressor hermetic case 21 is measured on the X-axis, Y-axis, and Z-axis, respectively, the upper case with the high-pressure generating portion is lower than the lower case with the refrigeration oil filled, and the amplitude of the vibration in the central portion of the plane wider than the corner portion The largest maximum displacement point appears. The maximum displacement point depends on the type of the compressor, the characteristics of the spring 19 (FIG. 1) installed inside the sealed case 21, the characteristics of the circular rubber installed on the outside of the sealed case 21, and the like. .

The side sound insulation board 22 and the top sound insulation board 23 are joined to such a maximum displacement point so that the rigidity of the sealed case 21 is increased and the spring constant is changed. The change in the natural frequency of the sealed case 21 is 2000 to 4000 zHz. Outside the resonant frequency of the range, the amplitude of the vibrations is reduced.

That is, in the past, the spring 19 (FIG. 1) installed inside the sealed case 21 was used as the first dustproof means, and the circular rubber (not shown) installed outside was used as the second dustproof means. In addition, it can be seen that it also has a third vibration-proof means such as the side sound insulation plate 22 and the top sound insulation plate (23).

In addition, a plurality of micropores 22a penetrate through the side sound insulation board 22 and the top sound insulation board 23 of the present invention.

In general, the space portion constituting the sealed case 21 and the predetermined gap (Q) can be expected to reduce the noise by communicating with the external noise source through the micro-pores (22a). The dimensions of the gap Q, the diameter of the micropores 22a and the formation intervals are preferably determined through experiments.

In addition, a porous sound absorbing material 24 is inserted into the space portion of the side sound insulation board 22 and the top sound insulation board 23.

The sound absorbing material generally uses glass fiber or asbestos, and the more the noise reduction amount increases as the microcavities 22a have porosity communicating with each other. However, care should be taken that the temperature of the refrigerant in the compressor is increased because the sound absorbing material also has a function of insulation to some extent.

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

On the other hand, increasing the thickness of the entirety of the sealed case 21 to reduce vibration and noise not only requires a press of a high capacity, but also has the disadvantage of increasing the weight of the entire compressor. By attaching, such drawbacks are minimized.

As described through the above embodiments, the low noise and low vibration case structure of the hermetic compressor of the present invention is used in a refrigerator. In a hermetic compressor having a means for sucking and discharging refrigerant inside the hermetic case, a plurality of soundproof plates are attached to the hermetic case, thereby reducing noise and vibration caused by the high pressure generating part in the hermetic case.

While the invention has been shown and described with respect to certain preferred embodiments, it will be understood that the invention can be variously modified and modified without departing from the spirit or scope of the invention as set forth in the following claims. Those skilled in the art can easily know that.

Claims (2)

A compressor in which a high-pressure generating means composed of a cylinder, a piston, a valve, and the like is mounted inside a sealed case 11 having a cylindrical structure in which upper and lower divided cans are welded: The sealed case 21 is a predetermined position having a large amplitude of vibration. Forming a space portion of a predetermined gap Q in the side sound insulation panel 22 and the top sound insulation plate 23 are joined; A plurality of micropores 22a penetrate through the side sound insulation board 22 and the top sound insulation board 23; Low noise and low vibration case structure of the hermetic compressor, characterized in that the porous sound-absorbing material 24 is inserted into the space portion of the side sound insulation board 22 and the top sound insulation board 23. According to claim 1, wherein the side sound insulating plate 22 is divided up and down on the inner side of the sealed case 21 is bonded to a plurality of points, the top soundproof plate 23 is the center on the inner upper surface of the sealed case 21 Low noise and low vibration case structure of a hermetic compressor characterized by being bonded to the vicinity.