KR100548858B1 - Hermetic type compressor and refrigerator using the same - Google Patents

Abstract

An object of the present invention is to suppress cavity resonance without complicating a structure in a refrigerator compressor.

The hermetic compressor houses the mechanism part 1 and the suction silencer 7 in the container 11. The suction silencer is provided with the silencer suction pipe 8, the silencer chamber part 9, and the silencer beauty tube 10. As shown in FIG. The opening 15, which is an end of the silencer aesthetic tube, is located above the center of the container in the vertical direction.

Container, Silencer Suction Tube, Mechanism, Suction Silencer, Silencer Chamber, Opening

Description

Hermetic compressor and refrigerator using it {HERMETIC TYPE COMPRESSOR AND REFRIGERATOR USING THE SAME}

1 is a longitudinal sectional view of an embodiment of a hermetic compressor according to the present invention;

FIG. 2 is a cross-sectional view of the arrow A-A of FIG. 1; FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 illustrates a cavity resonance mode.

5 illustrates a cavity resonance mode.

6 illustrates a cavity resonance mode.

7 is a diagram explaining a change in acoustic energy.

8 is a diagram explaining a sound source position;

9 is a longitudinal sectional view of another embodiment of the hermetic compressor according to the present invention;

10 is a longitudinal sectional view of one embodiment of a refrigerator in accordance with the present invention;

<Explanation of symbols for main parts of the drawings>

1: Mechanical part

2: motor

3: shaft

4: piston

5: cylinder

6: frame

7: suction silencer

8: silencer suction pipe

9: silencer chamber

10: silencer beauty

11: container

12: lubricating oil

13: elastic material

14: origin

15: opening (suction)

16: area containing two mode nodes

30: refrigerator

40: hermetic compressor

42: refrigerator

44: vegetable room

46: freezer

48: front door

50: back plate

52: bottom plate

101: Nodes in Joint Resonance Mode

102: ship in the cavity resonance mode

The present invention relates to hermetic compressors, and more particularly to hermetic compressors suitable for use in refrigerators.

An example of a conventional hermetic compressor is disclosed in Japanese Patent Laid-Open No. 6-93968. In the compressor described in this publication, at least one of a suction port and a discharge port inside the compressor is provided. Then, the inlet port or the outlet port is arranged on the node of two modes of the three common resonance modes, and the other one is disposed at a position symmetrical with respect to the node of the cavity resonance mode to prevent the cavity resonance of the compressor internal space.

[Patent Document 1]

Japanese Patent Laid-Open No. 6-93968

In the compressor described in the above prior art, it is necessary to provide a plurality of suction ports or discharge ports, and the structure is complicated. Moreover, even if the shape and arrangement of each component constituting the compressor are devised in order to accommodate the compressor in the hermetically sealed container, the volume of the container increases, making it difficult to proceed to miniaturization of the compressor. Moreover, since the flow path to a compression chamber becomes a long bend, there exists a possibility that a pressure loss may fall largely and efficiency may fall.                         

The present invention has been made in view of the problems of the prior art, and its object is to reduce the size of the hermetic compressor and to reduce the noise. Another object of the present invention is to achieve miniaturization and high efficiency in a compressor using a non-freon refrigerant. Still another object of the present invention is to reduce the size of the compressor for a refrigerator and to reduce the noise. And an object of this invention is to achieve at least any one of these objects.

A feature of the present invention for achieving the above object is a sealed compressor in which a piston and a cylinder are disposed at an upper portion and a motor is disposed at a lower portion thereof, and the piston and the cylinder and the motor are accommodated in a container. It is arrange | positioned in the height direction upper side of a container.

And in this aspect, it is preferable to arrange | position the suction port so that the angle (alpha) measured from the longitudinal direction of the horizontal cross section of a container may become (alpha) = 40 degrees-140 degrees. In addition, the motor is preferably supported by a container via an elastic material, and a silencer for guiding the refrigerant sucked into the cylinder is provided, and the suction port is preferably formed at the end of the silencer aesthetic tube of the silencer.

Another feature of the present invention for achieving the above object is a mechanical part having a motor, a shaft, a piston and a cylinder, a suction muffler fixed to the mechanical part with a silencer suction pipe, a silencer chamber part and a silencer aesthetic, and these mechanical part and suction silencer In a hermetic compressor having a container built-in and storing lubricant at the bottom, an opening of the silencer aesthetic tube is arranged above the center of the container in the vertical direction.

In this aspect, the container is composed of a plurality of curved surfaces, and the curvatures of the two curved surfaces that face each other in the right angle direction with respect to the driving direction of the piston are different from each other, and the opening of the silencer aesthetic tube is the curved surface with the smallest curvature among the two curved surfaces. It is preferable to place in.

Another feature of the present invention for achieving the above object is a hermetically sealed type having a refrigerator compartment at the top, a freezer compartment at the bottom, a vegetable compartment at the middle, and a rear side of the freezer compartment and a refrigerant for cooling the refrigerator compartment, the freezer compartment and the vegetable compartment at the bottom. In a refrigerator having a compressor, a hermetic compressor includes a piston and a cylinder at the top and a motor at the bottom, accommodates the piston and the cylinder and the motor in a container, sucks the refrigerant through the silencer through the cylinder, and the suction port of the silencer. On the upper side in the height direction of the container.

In this aspect, the refrigerant to which the compressor is compressed may be a non-freon refrigerant, or the curvature of the container wall surface of the inlet port of the compressor may be small, and the curvature of the container wall surface of the container wall facing the suction port side wall may be increased.

10 is a longitudinal sectional view of the refrigerator according to the present invention. In the refrigerator 30, a housing is formed by the front door 48, the bottom plate 52, the back plate 50, and the like. The housing is partitioned into several rooms. In the refrigerator 30 shown in the drawing, the refrigerator compartment 42 is formed in the upper portion, the vegetable compartment in the middle stage, and the freezer compartment 46 in the lower portion. Below the back plate 50, a hermetic compressor 40 is attached to the inside of the bottom plate 52 for conveying cold air into the air.

An embodiment of the hermetic compressor will be described with reference to FIGS. 1 is a longitudinal cross-sectional view of a hermetic compressor, FIG. 2 is a cross-sectional view of the arrow A-A of FIG. 1, and FIG. 3 is a cross-sectional view of the B-B arrow of FIG. In the container 11, the mechanism part 1 is accommodated and sealed. The motor 2 which comprises the mechanism part 1 is located in the lower part of the container 11. The motor 2 is a longitudinal axis motor, and the upper end of the shaft 3 is eccentric from the center of rotation. The piston 4 which reciprocates in the cylinder 5 is attached to this eccentric shaft 3. The lower surface of the cylinder 5 is fixed to the frame 6, and the frame 6 is attached to the upper part of the motor 2. The lower part of the motor 2 is supported by the container 11 via the elastic material 12, such as a spring.

The cylinder 5 communicates with the suction silencer 7. The suction silencer 7 has a silencer suction pipe 8, a silencer chamber 9, and a silencer aesthetic 10. The silencer suction pipe 8 is connected to the cylinder 5. The silencer chamber 10 has a rectangular shape, and a silencer aesthetics 10 is attached to one end surface thereof. The silencer aesthetics 10 has an opening 15 above the center 14 in the height direction of the container 11. The suction silencer 7 is a molded product of resin.

Lube oil 12 is stored in the lower part of the container 11. The space in the container 11 is filled with a refrigerant warmed by cooling the inside of the refrigerator. The refrigerant is fed into the compressor from the outside of the compressor through a suction pipe (not shown) connected to the compressor. The refrigerant transferred into the vessel 11 is led to the cylinder 5 via the suction muffler 7. And the eccentric part of the shaft 3 eccentrically moves by driving the motor 2, and the refrigerant | coolant which flowed in between the piston 4 and the cylinder 5 is compressed. The compressed refrigerant is sent out of the compressor through a discharge silencer and a discharge pipe (not shown), and is used for cooling the refrigerator.

The container 11 is composed of a plurality of curved surfaces so as to be able to withstand the pressure of the refrigerant and to be highly rigid, and has a spherical shell shape. The lubricating oil 12 stored in the bottom part of the container 11 is transferred from the flow path of the lubricating oil formed in the shaft 3 to each lubricating part of the mechanism part 1, and reduces friction at the time of high speed rotation.

In the coordinate system shown in Fig. 1, the driving direction (horizontal direction) of the piston 4 is in the X direction, the axial direction (vertical direction) of the shaft 3 is in the Z direction, and the direction perpendicular to the X and Z directions (horizontal direction). Is in the Y direction. The origin 14 in the container 11 is determined as follows. The distance between the horizontal plane (XY plane) when the distance between the inner walls of the container 11 in the X direction is the maximum and the vertical plane (YZ plane) when the distance between the inner walls in the Y direction is the maximum and the inner wall distance in the Z direction become the maximum. In this case, the intersection point of the vertical plane (ZX plane) is used. That is, it is the intersection of two perpendicular planes orthogonal to a horizontal plane orthogonal to their respective vertical planes. Although the vessel 11 may be provided with ribs or partial uneven curvatures for high rigidity, the volume inside the compressor is almost determined by the volume composed of the large curvature curved surface, so that the origin 14 is formed on the inner wall of the large curvature curved surface. We decide from distance between.

As shown in Fig. 2, the silencer aesthetics 10 is disposed near the inner wall of the container 11, and the opening portion 15 is located above the origin 14 in the vertical direction. 3, the silencer aesthetics 10 is bent in the circumferential direction along the inner wall of the container 11. And the opening part 15 is arrange | positioned to the place where the angle (alpha) which consists of X axis on a horizontal plane (XY plane) is 40 degrees or more and 140 degrees or less. This angle (alpha) is 90 degrees in FIG. In addition, as shown in FIG. 3, the opening part 15 may be the inner wall direction of the container 11, or may be facing the other direction.

The opening part 15 of the silencer aesthetic appearance is arrange | positioned like FIG. 2 for the following reasons. Due to environmental concerns, the use of non-freon refrigerants is also recommended in refrigerators. If the non-freon-based refrigerant is to be used to achieve the same or better performance as that of the low-fron-based refrigerant, the diameter of the cylinder 5 is increased to increase the compression volume. In the refrigerator, on the other hand, it is required to miniaturize the compressor and increase the high internal capacity. The volume of the compressor is related to the outer circumferential length in the horizontal cross section of the container 11, which is governed by the motor shape.

By the way, when the motor 2 is elastically supported by the container 11 by the elastic material 13, such as a spring, and the floating amount from the inner wall of the container 11 by the elastic material 13 is made small, the container 11 ) Height can be reduced. At that time, if the flow rate of the lubricating oil 12 does not change, the oil surface position becomes relatively high, and there is a concern that the lubricating oil 12 may be sucked into the cylinder 5 from the silencer beautiful tube 10. If the lubricant is sucked in, the efficiency of the compressor is reduced. In order to prevent this efficiency fall, the opening part 15 of the silencer aesthetics 10 is set to the position higher than the origin 14 in the vertical direction.

4 to 6 show simulation results of the cavity resonance sound in this embodiment configured as described above. 4 to 6 are the results obtained by numerically calculating the sound pressure modes (hereinafter, simply referred to as modes) of three representative cavity resonances by numerically modeling the refrigerant volume inside the compressor. The coordinate system is the same as in FIG. 4 (a) to 6 (a) are views showing the entire refrigerant volume, and FIGS. 4 (b) to 6 (b) are longitudinal cross-sectional views and FIG. 4 (c). (C) is a top view. In each figure, the cavity resonance mode takes a value of 0 to 1 and represents it in eight shades of light. White has a mode amplitude of zero, indicating node 101. Black has a mode amplitude of 1 and represents a fold 102. When the low-front refrigerant is used, the natural frequency of the three modes is around 500 Hz, but when the non-freon refrigerant is used, it is around 800 Hz. In addition, if the type of refrigerant used is changed, the speed of sound changes and the frequency of the three modes is changed, but the sound pressure distribution of the modes is the same, so that it can be applied regardless of the refrigerant.

As can be seen from Figs. 4 and 5, the node 101 in the cavity resonance mode exists near a plane in which X and Z have a predetermined relationship, regardless of the position in the Y direction. In addition, the vessel 102 in the cavity resonance mode exists in upper and lower corners of the outer surface of the refrigerant volume. In Fig. 3, the horizontal angle? Of the opening portion 15 of the silencer aesthetics 10 is set to 90 degrees. It is preferable that this angle (alpha) is as close to 90 degrees as possible. The area with angle (alpha) of 40 degrees or more and 140 degrees or less is divided and shown by the broken line in FIG.4 and FIG.5. Since this region includes nodes of both modes in Figs. 4 and 5, it is called an area 16 including nodes of two cavity resonance modes.

In the center part of the up-down direction in which the angle (alpha) of the area | region 16 is 90 degrees, all the states of the two cavity resonance modes are nodes. In the cavity resonance mode shown in Fig. 6, the node 101 is in the XZ plane passing through the origin 14, and the ship 102 is at both ends in the Y direction and slightly below the up and down direction. FIG. 6 is a diagram of the area 16 superimposed on a third cavity resonance mode. 6 shows that the ship 102 of the cavity resonance mode is included.

In this embodiment, the opening 15 is disposed above the origin 14 to suppress the cavity resonance mode shown in FIGS. 4 and 5 while avoiding the multiple times of the cavity resonance mode shown in FIG. 6. In addition, the suppression of the cavity resonance mode shown in FIGS. 4 and 5 is prioritized, and the double resonance mode shown in FIG. 6 is avoided as much as possible. The reason is as follows.

As the opening part 15 becomes a sound source, the result of the acoustic analysis is shown to FIG. 7 and FIG. Fig. 7 shows the sound energy by changing the angle α of the position of the sound source, and Fig. 8 shows an example of the mesh used for analysis. The angle α of the sound source is changed by eight points at intervals of 10 degrees from 20 degrees to 90 degrees. The up-down position of the sound source was set slightly above the origin 14.

According to this acoustic analysis, the up-down position of the set sound source is close to the origin, and the arrangement (dark position) is close to that of the cavity resonance mode shown in Fig. 6A. 7 shows the sum of acoustic energy in the cavity resonance modes shown in FIGS. 4 to 6. The angle (alpha) of a sound source made the value in 20 degree | times 1, and shown dimensionless. As for the breakdown of the acoustic energy at each angle α, the contribution of the cavity resonance mode shown in FIG. 4 is white, the contribution of the cavity resonance mode shown in FIG. 5 is an oblique line, and the cavity resonance mode shown in FIG. The contribution of is shown in a mesh.

In the angle range α = 20 ° to 90 ° shown in FIG. 7, the sound energy decreases as the angle of the sound source increases, and becomes the smallest at the angle α = 90 °. Further, the contribution of the cavity resonance mode shown in Fig. 5 is the maximum, and in the range of angle α = 20 ° to 50 °, the contribution of the mode shown in Fig. 4 is followed by the contribution of the mode shown in Fig. 6. The least. When the angle α of the sound source is 50 ° to 90 °, the contribution of the mode shown in Fig. 6 is the contribution of the mode shown in Fig. 5, and then the contribution of the mode shown in Fig. 4 is minimal. For the cavity resonance mode shown in Fig. 6, the contribution is small even though the sound source is located near the ship in the cavity resonance mode. By this, it can be seen that the effect of noise reduction is great when the cavity resonance modes of FIGS. 4 and 5 are suppressed. Therefore, the suppression of these modes is given priority over the cavity resonance modes shown in FIG.

According to the present embodiment, since the opening of the silencer aesthetics is arranged in a position where the cavity resonance can be suppressed while avoiding mixing of lubricating oil in the hermetic compressor, the noise of the hermetic compressor can be reduced. In the design of the suction silencer, only the position of the silencer aesthetics and the openings need to be taken care of, so that the efficiency decrease due to the complexity or complexity of the structure of the suction silencer can be avoided.

Another embodiment of the present invention will be described with reference to FIG. 9 is a view similar to FIG. The definition of the coordinate system and origin 14 in FIG. 9 is the same as that shown in FIGS. The present embodiment differs from the above embodiment in that the container 11 is constituted of a plurality of curved surfaces, and is opposed to each other at the maximum inner diameter position of the container 11 in a horizontal direction and in a direction perpendicular to the cylinder axis (Y direction). The curvature of the container wall is different. The surface with large curvature is surface B, and the surface with small curvature is surface A.

When the space inside the container 11 is divided into two in the ZX plane (vertical plane) passing through the origin 14, the space including the curved surface A is called space A, and the space including the curved surface B is called space B. The opening part 15 of the silencer aesthetics is located in the space A, and is located above the origin 14 in the vertical direction (Z direction). The opening part 15 of the silencer aesthetic view may face the inner wall of the container 11, or may face the other direction.

According to this embodiment, since the angle α of the opening portion 15 is 90 degrees, it corresponds to the node of the cavity resonance mode shown in Figs. 4 and 5, and the cavity resonance mode shown in Figs. 4 and 5 is suppressed. do. There is a difference in curvature between the curved surface A and the curved surface B of the container 11. By this curvature difference, the noise by the cavity resonance mode shown in FIG. 6 is reduced. The reason is as follows.

The cavity resonance mode shown in Fig. 6 is doubled at both ends in the Y direction. Since the angle α of the opening of the silencer aesthetics is 90 degrees, it is a position close to twice the mode shown in Fig. 6, and it is difficult in the embodiment shown in Fig. 3 to reduce the cavity resonance sound by this mode. However, in the present embodiment, since the curvatures are different in the curved surface A and the curved surface B, the sound pressure distribution asymmetrical in the Y direction can be obtained in the cavity resonance mode shown in FIG.

That is, the sound pressure level in the ship of the cavity resonance mode on the curved surface B side with large curvature becomes larger than the sound pressure level of the ship in the cavity resonance mode on the curved surface A side with small curvature. This is because the distance from the wall surface on which the enclosed space B is reflected on the curved surface B with a large curvature becomes shorter, so that a portion with a high sound pressure level is easily generated. On the other hand, in space A enclosed by curved surface A with a small curvature, the sound pressure level is low even if it is mode. Therefore, the opening part 15 is arrange | positioned in space A. FIG. Moreover, since the opening part 15 is arrange | positioned above the center of the up-down direction, mixing of the lubricating oil 12 and efficiency fall can be avoided. According to this embodiment, noise reduction can be expected more than in the embodiment shown in FIG.

As described above, according to the present invention, since the opening of the suction silencer is positioned above the origin of the container, it is possible to achieve both miniaturization and noise reduction of the hermetic compressor.

Claims (9)

delete delete delete delete delete A mechanism having a motor, a shaft, a piston, and a cylinder, a suction silencer having a silencer suction tube, a silencer chamber portion, and a silencer aesthetic, and fixed to the mechanism, and a container for storing these mechanisms and suction silencers and storing lubricant at the bottom. Is a hermetic compressor for a refrigerator, The opening of the silencer aesthetics is disposed above the center of the container in the vertical direction, The container is composed of a plurality of curved surfaces, and the curvature of the two curved surfaces that are perpendicular to each other in the direction perpendicular to the driving direction of the piston is different from each other, and the opening of the silencer aesthetic tube is disposed on the curved surface with the smallest curvature among the two curved surfaces. A hermetic compressor for refrigerators, characterized in that one. delete delete A refrigerator having a refrigerating compartment in an upper portion, a freezing compartment in a lower portion, and a vegetable compartment in an intermediate portion, and having a hermetic compressor for compressing a refrigerant for cooling the refrigerating compartment, a freezing compartment, and a vegetable compartment in a lower side of the freezing compartment and a lower portion of the refrigerator. A piston and a cylinder and a motor are disposed in the lower part, the piston and the cylinder and the motor are accommodated in the container, the refrigerant is sucked through the cylinder through the silencer, and the suction port of the silencer is disposed on the upper side in the height direction of the container. , The refrigerant compressed by the compressor is a non-freon refrigerant, And a curvature of the container wall surface facing the suction port side wall surface is small, and the curvature of the container wall surface facing the suction port side wall of the compressor is increased.

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