JP2011169183A - Accumulator for hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: noise and vibration of a hermetic compressor are adversely affected by mounting displacement or inclination of a connecting member when respective combined components composing an accumulator are integrally fixed by brazing in a furnace in a reducing gas atmosphere, in the accumulator for the hermetic compressor, the accumulator having an approximately circular cross sectional shape, and including a suction pipe composing a refrigerant passage, an inner pipe supplying refrigerant gas to the compressor, a baffle fitted with a mesh for trapping foreign matter and provided in the lower portion of the suction pipe, and the connecting member fixing the inner pipe to a shell inner wall surface and provided within a distance close to the baffle. <P>SOLUTION: The connecting member is configured to be deflected when the connecting member is combined with a shell. Thereby, even if retaining force of the shell and connecting member is weakened in a combination of the respective components, the deflection of the connecting member compensates the weakened retaining force and excellent retaining force is maintained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an accumulator provided in a hermetic compressor such as a rotary compressor or a scroll compressor used in an air conditioner or a refrigerator.

  Conventionally, in an accumulator for a hermetic compressor, it has been an important issue to suppress generation of noise and vibration during operation of the compressor.

  As a countermeasure for this, for example, in Patent Document 1, a part of the inner tube inside the closed container of the accumulator absorbs vibration as a structure that can move flexibly, thereby reducing noise.

  Moreover, the rigidity of the accumulator is improved by connecting and fixing the inner pipe and the inner wall surface of the accumulator shell via a connecting member arranged inside the accumulator, and the accumulator mounting bracket is fixed to the hermetic compressor. A method of reducing vibration and noise by eliminating the free vibration of the inner pipe by making the position in the height direction the same has been put into practical use.

JP 2001-041163 A

  In the conventional technology, when the inner pipe is made flexible, there remains a problem in eliminating low-frequency noise due to a beat phenomenon that occurs during low-speed operation of the compressor.

  On the other hand, when fixing the inner pipe to the accumulator, the arrangement of the connecting member for fixing the inner pipe is at the same position in the height direction as the accumulator mounting bracket provided in the hermetic compressor. It is arranged at a position relatively close to the baffle for removing foreign matter provided in the lower part.

  For this reason, a circular member having the same outer dimension is disposed at a close distance on the inner diameter portion of the shell of the cylindrical accumulator, which is naturally caused by a dimensional variation between actual parts of the shell and the baffle or the shell and the connecting member. When one component is held by the shell, the holding force between the other component and the shell may be loosened.

  In addition, since the relative dimensions of the parts held by the shell inner diameter part and the parts having a weak holding force change with each production lot of each part, the management point is not uniquely determined when assembling each part.

  Further, as a method of fixing the baffle and the connecting member to the shell inner diameter portion of the accumulator, a method by brazing in a furnace in a reducing gas atmosphere is generally adopted from the viewpoint of economic rationality.

In that case, if the attachment holding force to the shell inner diameter part is loose, it is finished in a state where it deviates beyond the allowable limit from the predetermined position in the furnace or tilts so as to be twisted, and a gap is created in part, If this is a baffle, not only does the original purpose of capturing foreign matter not occur, but there is no way to inspect the fixed state of the parts arranged inside the accumulator finished product cheaply and in a simple way. There was a problem.

  A first means for solving the conventional problem is that an accumulator having a substantially circular cross-sectional shape for a hermetic compressor is provided with an intake pipe through which refrigerant gas flows and an inner pipe through which refrigerant gas flows out to the compressor. In addition, a baffle fitted with a net for capturing foreign matter is provided at the lower part of the suction pipe, and a connecting member for fixing the inner pipe to the inner wall surface of the accumulator is provided at the lower part of the baffle. When the connecting members are mounted simultaneously, the baffle and the connecting members are held together on the inner wall surface of the accumulator by bending the connecting members.

  The second means for solving the conventional problem is configured so that the connecting member and the accumulator inner wall surface are substantially in line contact when the accumulator inner wall surface and the baffle are in contact with each other.

  According to a third means for solving the conventional problems, the connecting member is configured such that the contact portion with the inner wall surface of the accumulator is smaller than the non-contact portion.

  According to a fourth means for solving the conventional problem, the connecting member is formed in a triangular shape.

  A fifth means for solving the conventional problems is configured such that the rigidity of the connecting member is appropriately adjusted by providing a hole in the connecting member.

  The accumulator according to the present invention provides a technique for stably fixing a baffle and an inner tube fixing connecting member disposed at a close distance inside the shell of the accumulator to the inner wall surface of the shell, thereby improving the yield during the manufacture of the accumulator. Is.

Partial longitudinal cross-sectional view of the accumulator in Embodiment 1 of this invention Cross section of accumulator in embodiment 2 of the present invention Cross-sectional view of an accumulator according to Embodiment 3 of the present invention Cross-sectional view of an accumulator according to Embodiment 4 of the present invention Press plate arrangement layout of connecting members in the present invention Partial longitudinal sectional view of a conventional accumulator

(Embodiment 1)
FIG. 1 is a partial longitudinal sectional view of an accumulator showing an embodiment of the first and second means according to the present invention. On the other hand, FIG. 6 shows a partial longitudinal sectional view of an accumulator according to the prior art.

  This type of accumulator is typically assembled by in-furnace brazing in a reducing gas atmosphere after combining the components.

  FIG. 6 shows a state in which each component of the accumulator is integrally fixed by a brazing material after being put into the reduction furnace. FIG. 1 shows a state in which the components of the accumulator before being put into the reduction furnace are combined in a predetermined state.

  In the accumulator of FIG. 6, the combination of the parts before charging the reducing furnace is such that one of the two parts is relatively strong against the shell 2 when the connecting member 11 is inserted into the shell 2 of the accumulator 1 and then the baffle 5 is inserted. And the other is held relatively gently.

  First, assuming that the connecting member is held firmly and the baffle 5 is held gently, the shell 2 follows the shape of the inner wall of the upper shell 2u when the shell 2 is covered with the upper shell 2u. Sticks to the baffle 5 more than before.

  Further, when the lower shell 2d is inserted into the shell 2, the inner wall of the shell 2 follows the outer shape of the lower shell 2d. As a result, the shell 2 is distorted so that the diameter is small at the upper part and the diameter at the lower part. For this reason, the holding force of the connecting member 11 is weakened from the beginning, but the holding force is maintained relatively strong for the combined portion of the upper shell 2u, the baffle 5, and the shell 2 and the combined portion of the shell 2 and the lower shell 2d. Will remain. When the accumulator is put into the reduction furnace in this state, the connecting member 11 is displaced or tilted in the shell 2 without control as the inner diameter of the shell 2 expands due to thermal expansion and the axial dimension increases. In the worst case, it falls off in the direction of the lower shell 2d. In this case, if the connection and fixing position of the inner tube 4 and the shell 2 in the completed accumulator is different from the required position, the noise and vibration of the hermetic compressor are adversely affected.

  Next, assuming that the connecting member 11 is relatively gently held by the shell 2 and the baffle 5 is relatively firmly held, the lower shell 2d is inserted into at least the shell 2 as described above. After that, the holding force of the connecting member 11 becomes further gentle.

  However, in the configuration of FIG. 1 according to the present invention, when the connecting member 6 is inserted and combined with the shell 2, the connecting member 6 is always set to a diameter dimension that allows the connecting member 6 to be pressed into the shell 2, and the connecting member is in the axial direction of the accumulator. Designed to bend toward Furthermore, if the connecting member 6 is in contact with the shell 2 at an angle so that the connecting member 6 is in contact with the substantially linear shape as shown in the figure, the bending in the axial direction becomes more reliable.

  Thereby, even after the subsequent combination of the components of the accumulator, even if the shell 2 is deformed in a direction in which the holding force of the connecting member 6 and the shell 2 is weakened, the bending force of the connecting member 6 immediately compensates for it. Therefore, it is possible to prevent a change in the positional relationship and inclination between the shell 2 and the connecting member 6 with respect to the accumulator 1 even after being put into the reduction furnace, and to provide a high-quality accumulator.

(Embodiment 2)
FIG. 2 is a cross-sectional view of an accumulator showing an embodiment of the third means according to the present invention.

  In FIG. 2, even if the press-fitting adjustment of the connecting member 7 with respect to the shell 2 is set larger by increasing the length that the connecting member 7 does not contact with the inner wall surface of the shell 2, the connecting member 7 remains the shaft of the accumulator. Can bend sufficiently with respect to the direction.

(Embodiment 3)
FIG. 3 is a cross-sectional view of an accumulator showing an embodiment of the fourth means according to the present invention.

In FIG. 3, since the shape of the connecting member 8 is the triangular shape, the longer contact portion between the inner wall surface of the shell 2 and the connecting member 8 is longer and shorter, and the longer contact portion is used as a fulcrum. Since the gap between the shorter side and the inner tube 4 is easily bent, the design for controlling the press-fitting adjustment of the connecting member 8 with respect to the shell 2 is facilitated.

(Embodiment 4)
FIG. 4 is a cross-sectional view of an accumulator showing an embodiment according to the fifth means of the present invention.

  In FIG. 4, a hole 10 is provided in the connecting member 8, so that the connecting member 8 can be press-fitted into the shell 2 in a state of almost three-point support.

  As shown in FIG. 5, compared to the case where the connecting member 6 has a circular shape like the baffle 5, the shape as in the case of the connecting member 7, the connecting member 8, or the connecting member 9, in production by pressing, Since the number of coil-shaped plate materials, that is, so-called hoop materials, is increased, it is possible to provide an accumulator that can save material and contribute to resource saving.

  As described above, in the accumulator for a hermetic compressor according to the present invention, when the connecting member for fixing the inner tube to the inner wall surface of the accumulator is manufactured at a close distance from the baffle, the yield is highly reliable. Therefore, it is possible to provide a hermetic compressor excellent in quality, thereby providing an air conditioner, refrigerator, washing dryer and the like excellent in quality.

1 accumulator 2 shell 2u upper shell 2d lower shell 3 suction pipe 4 inner pipe 5 baffle 5a net 6 connecting member 7 connecting member 8 connecting member 9 hoop plate material 10 hole 11 connecting member 12 copper brazing material 13 silver brazing material 14 suction tube

Claims (5)

An accumulator having a substantially circular cross-sectional shape for a hermetic compressor, wherein an accumulator is provided with a suction pipe for flowing refrigerant gas into the hermetic container and an inner pipe for flowing refrigerant gas into the compressor. The lower part of the suction pipe is provided with a baffle fitted with a net for capturing foreign matter. The lower part of the baffle is provided with a connecting member for fixing the inner pipe to the inner wall surface of the accumulator. The accumulator is connected to the baffle. An accumulator for a hermetic compressor in which the baffle and the connecting member are held together on the inner wall surface of the accumulator by bending the connecting member when the members are mounted simultaneously. The accumulator for a hermetic compressor according to claim 1, wherein when the contact portion between the inner wall surface of the accumulator and the baffle is in surface contact, the connecting member and the inner wall surface of the accumulator are in a form close to stranded contact. The accumulator for a hermetic compressor according to claim 1, wherein the connecting member has a smaller contact portion with the accumulator inner wall surface than a non-contact portion. The accumulator for a hermetic compressor according to any one of claims 1 to 3, wherein the connecting member has a triangular shape. The accumulator for a hermetic compressor according to any one of claims 1 to 4, wherein the connecting member is provided with a hole to reduce the rigidity of the connecting member.