JP5018111B2 - Filter and refrigerant compressor - Google Patents

Description

  The present invention makes it possible to remove fine dust by applying an ultrafine mesh in a filter used in an accumulator, an oil pump or the like used in a refrigeration compressor.

There are various types of compressors for refrigeration, such as rotary compressors and scroll compressors. All of these compressor mechanisms and bearings and other sliding parts slide with a clearance of micron units. It has become. For this reason, an accumulator arranged near the compressor inlet and an oil pump inlet for supplying lubricating oil to each sliding part are provided with a filter for capturing dust entering the compression mechanism part and the sliding part. Yes. Since this filter is used in a refrigerant, exposed to refrigeration oil, and has a wide range of ambient temperatures from -45 ° C to 120 ° C, it is a metal material taking refrigerant resistance, oil resistance, and heat resistance into consideration. Is used.
Japanese Patent Laid-Open No. 11-022643

  However, when fixing a conventional mesh directly by brazing etc., if you try to adopt an ultra fine mesh to remove ultra fine dust, it may not fix well due to insufficient strength, or the mesh will swell and other parts There were problems such as interference.

  The invention of the present application is to solve such a problem, by sandwiching the top and bottom of an ultrafine mesh with a coarse mesh, caulking it into a ring-shaped metal, and making it an integral coin filter, An object of the present invention is to provide a filter for a refrigeration compressor that can be fixed and can remove ultrafine dust by avoiding clogging of a fine mesh by attaching a conventionally employed mesh.

  Place a steel mesh covering the inside of the cylindrical part with a flat part corresponding to the fixed part flat part on the outer periphery of the filter fixed base having a cylindrical part and a flat part perpendicular to the central part, and By incorporating a coin-shaped filter in which a fine mesh and a coarse mesh are caulked with a ring-shaped metal above and below the ultrafine mesh, it is possible to mount the ultrafine mesh while avoiding clogging.

  By mounting the filter of the present invention, it is possible to remove even ultrafine dust that cannot be removed conventionally.

  According to the first aspect of the present invention, a filter fixing base having a cylindrical portion and a flat portion that is perpendicular to the central portion and directed in the center direction has a flat portion corresponding to the fixing base flat portion on the outer peripheral portion and covers the inside of the cylindrical portion. A coin-shaped filter in which a mesh made of a ring is integrated by caulking in a state where an ultrafine mesh is sandwiched from above and below by a mesh coarser than the mesh is placed at the entrance portion, and a mesh-like filter is integrated in the flat portion. At the same time, it is a filter joined by brazing, etc., while removing ultra-fine dust that could not be removed in the past, while removing dust of the conventional size with a single mesh, more reliably avoiding clogging be able to.

  According to the second aspect of the present invention, the fine mesh applied to the coin-shaped filter has a mesh size of 300 or more. The filter according to the first aspect is ultrafine and has a low rigidity when used alone. It is possible to remove ultrafine dust by avoiding the possibility of deformation or tearing due to the above, and the possibility that the mesh is immediately clogged by large dust.

  According to a third aspect of the present invention, the thickness of the line constituting the fine mesh is 0.05 mm or less. When the filter is used in the refrigerant compressor according to the first aspect, the fine mesh has a fine line thickness and is used alone. The rigidity is weak, and it is possible to remove ultrafine dust while avoiding the possibility of deformation or tearing by a fluid or the clogging of a mesh due to large dust.

  A fourth aspect of the present invention is a refrigerant compressor having the filter according to the first to third aspects, and can reliably remove dust and the like to obtain a highly reliable refrigerant compressor.

  The invention according to claim 5 is the refrigerant compressor according to claim 4, wherein the refrigerant is a natural refrigerant, and has a density higher than that of the conventional refrigerant and has a characteristic of separating dust from the material surface. In a compressor that uses a natural refrigerant that is highly likely to cause problems due to dust, it is possible to reliably remove ultrafine dust and improve the reliability of the compressor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a scroll compressor. The refrigerant gas sucked from the suction pipe 1 passes through the suction chamber 3 of the fixed scroll part 2, is confined in the compression chamber 5 formed by meshing with the orbiting scroll part 4, and is compressed while reducing the volume toward the center. Then, it is discharged from the discharge port 6.

  Lubricating oil is sucked up from the lower part of the compressor through the oil pump cover 17 by the trochoid pump 7 given rotational movement by the crankshaft 8, passes through the lubricating oil supply hole 9 in the crankshaft 8, and the eccentric bearing of the orbiting scroll component 4. Guided to the internal space 10. From here, the oil flow path is divided into two directions, one of which is a back pressure chamber 13 formed by being surrounded by the fixed scroll part 2 and the bearing 12 via the throttle part 11 provided on the rear surface of the orbiting scroll part 4. Led to.

  The back pressure chamber 13 has an intermediate pressure of high and low pressure, and the back pressure adjusting mechanism 14 controls the intermediate pressure to be a constant pressure. The back pressure adjusting mechanism 14 is provided with a valve 16 in a passage 15 communicating from the back pressure chamber 13 to the suction chamber 3 through the inside of the fixed scroll part 2, and the pressure of the back pressure chamber 13 is set. When the pressure becomes higher, the valve 16 opens and the oil in the back pressure chamber 13 is supplied to the suction chamber 3 to maintain a constant intermediate pressure in the back pressure chamber.

  The oil supplied to the suction chamber 3 moves to the compression chamber 5 along with the swiveling motion, which helps to prevent leakage between the compression chambers. However, the back pressure control mechanism is very weak against foreign matter and minute dust enters. Then, when the valve 16 is bitten, it does not function.

  FIG. 2 shows a configuration diagram of the oil pump cover 17, and FIG. 3 shows an exploded view. The pump cover 17 includes a pump body 17a, an oil suction pipe 17b, and a filter 17c. The filter 17c is composed of a dust collecting mesh 18, a plurality of meshes, and a coin-shaped filter 19 composed of a ring-shaped caulking portion.

As shown in FIG. 4, the coin-like filter 19 is composed of a mesh 20 having a fine mesh, a mesh 21 having a coarse mesh, and a ring-shaped caulking metal 22. Since the mesh 20 uses a mesh of No. 300 or more which is not normally used so that ultra fine dust can be removed, its wire diameter is very thin and mechanical strength such as rigidity cannot be expected. Therefore, the strength is ensured by sandwiching the mesh 21 between the mesh 21 and the mesh 21.

  The mesh 19 is a general dust removal mesh and removes iron powder and copper powder having a size of 100 μm or more that are present most in the compressor. Since dust having a size smaller than that can be removed by the mesh 20, it is possible to prevent the dust from entering the compressor and the back pressure control unit.

  In particular, in the case of a compressor using a natural refrigerant, since there is a characteristic that the refrigerant also carries the dust remaining on the surface of the material due to the refrigerant characteristics, removing fine dust like the mesh 20 improves the quality of the compressor. It can be expected to be very effective in securing.

  As described above, the filter according to the present invention can remove ultrafine dust inside the compressor, and can maintain the quality of the compressor.

Sectional drawing of the scroll compressor which shows the Example of this invention Sectional view of the oil pump cover of the present invention Exploded view of oil pump cover of the present invention Enlarged view of the ring filter of the present invention Oil pump cover diagram showing a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suction pipe 2 Fixed scroll part 3 Suction chamber 4 Orbiting scroll part 5 Compression chamber 6 Discharge port 7 Trochoid pump 8 Crankshaft 9 Internal hole 10 Eccentric bearing internal space 11 Throttle part 12 Bearing 13 Back pressure chamber 14 Back pressure adjustment mechanism 15 Passage 16 Valve 17 Oil pump cover 17a Pump body 17b Oil suction pipe 17c Filter 18 Mesh 19 Coin filter 20 Mesh 21 Mesh 22 Caulking metal part

Claims (5)

A filter fixing base having a flat portion toward the cylindrical portion and at right angles to the central direction thereto, and steel mesh covering the cylindrical portion inside with the outer peripheral portion of the flat portion corresponding to the previous SL fixing base flat portion, the cylindrical portion inside A filter capable of mounting an ultrafine filter by simultaneously joining a coin-like filter formed by caulking a steel mesh having a plurality of eyes covering metal with a metal at the flat portion. 2. The filter according to claim 1, wherein the finest mesh arranged in the center of the coin filter is No. 300 or more. The filter according to claim 1, wherein the thickness of a line constituting the finest mesh arranged at the center of the coin filter is 0.05 mm or less. A refrigerant compressor having the filter according to any one of claims 1 to 3. The refrigerant compressor according to claim 4, wherein the refrigerant constituting the refrigeration cycle is a natural refrigerant.

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