JP2009138582A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly-reliable hermetic compressor by always stably supplying sufficient oil to respective sliding portions and preventing wear and damaging of the sliding portions concerning the hermetic compressor. <P>SOLUTION: The hermetic compressor comprises a crankshaft 115 having an oil feeding mechanism drawing oil 102 upward and a cylinder block having a cylindrical compression chamber, wherein the oil feeding mechanism comprises a spiral groove cut in an outer periphery of the crankshaft 115 and the spiral groove has a foreign matter discharge preventing means 131 for conveying foreign matters drawn up together with the oil 102 to an upper part without discharging them into the sliding portions between the crankshaft 115 and a main bearing 123. The foreign matter discharge preventing means 131 can prevent the foreign matters such as wear powder from gathering and flowing along with the oil into the sliding portions so that the sliding portions can be prevented from wearing and being damaged by the foreign matters such as wear powder and the highly-reliable hermetic compressor can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil supply mechanism for a hermetic compressor.

  Conventionally, an oil supply device for a general hermetic compressor includes an oil supply mechanism that pumps up oil stored in a closed container, and a spiral that supplies centrifugal force generated by rotation of a rotary shaft to each sliding portion. A crankshaft is provided with a shaped oil groove, and the oil pumped up by the oil supply mechanism lubricates the main shaft while passing through the helical oil groove, and further lubricates each sliding part such as the eccentric part. Yes (see, for example, Patent Document 1).

  The prior art hermetic compressor will be described below with reference to the drawings.

  FIG. 4 is a longitudinal sectional view of a side surface of a conventional hermetic compressor described in Patent Document 1, and FIG. 5 is a front view of a conventional crankshaft described in Patent Document 1. 6 is a cross-sectional view of a main part taken along line BB in FIG.

  The arrows in FIGS. 5 and 6 indicate the rotation direction of the crankshaft.

  4 to 6, the oil 2 is stored in the sealed container 1, and the electric element 5 including the stator 3 and the rotor 4 and the compression element 6 driven by the electric element 5 are stored.

  The compression element 6 includes a cylinder 8 that forms a compression chamber 7 and a piston 10 that is slidably inserted in the cylinder 8.

  A crankshaft 13 having a main shaft portion 11 and an eccentric portion 12 is rotatably supported by a main bearing 14 having a slide bearing structure, while the rotor 4 is mounted on the crankshaft 13.

  The crankshaft 13 is provided with an oil supply hole 16 having one end opened to the oil 2 and the other end communicating with the lower end of the spiral groove 15 engraved on the outer periphery of the crankshaft 13. The upper end communicates with the oil flow path 17 of the eccentric portion 12.

  The operation of the hermetic compressor configured as described above will be described below.

  When the electric element 5 is energized, the electric element 5 is activated and the rotor 4 rotates. Then, the crankshaft 13 mounted integrally with the rotor 4 rotates, and the movement of the eccentric portion 12 of the crankshaft 13 is converted into the reciprocating motion of the piston 10 of the compression element 6, and the piston 10 moves in the cylinder 8. It reciprocates and sucks and compresses the refrigerant in the compression chamber 7.

The oil 2 stored in the sealed container 1 is pumped upward by an oil supply hole 16 attached to the lower end of the crankshaft 13 by centrifugal force generated by the rotation of the crankshaft 13, and passes through a spiral groove 15 provided in the crankshaft 13. The main bearing 14, the eccentric part 12, and the sliding parts of the compression element 6 are supplied.
JP 2001-182656 A

  However, in the conventional configuration, foreign matter such as abrasion powder mixed in the oil 2 pumped into the spiral groove 15 of the crankshaft 13 flows out from the spiral groove 15 together with the oil 2 to the sliding portion, and the loss at the sliding portion. There is a possibility that the reliability increases such as wear and scratches.

  The present invention solves the above-mentioned conventional problems, and prevents foreign matter such as wear powder mixed with oil in the oil supply mechanism from flowing out from the oil supply mechanism to the sliding part, thereby preventing an increase in loss at the sliding part. In addition, an object of the present invention is to provide a highly reliable hermetic compressor that prevents the sliding portion from being worn or damaged.

  In order to solve the above-described conventional problems, the spiral groove constituting the oil supply mechanism engraved on the outer periphery of the crankshaft does not discharge foreign matter pumped up together with the oil to the sliding portion between the crankshaft and the main bearing. It is provided with a foreign matter discharge prevention means that is transported to the upper portion, and has an effect of preventing foreign matters such as wear powder mixed with oil in the oil supply mechanism from flowing out from the oil supply mechanism to the sliding portion.

  In the hermetic compressor of the present invention, the spiral groove constituting the oil supply mechanism engraved on the outer periphery of the crankshaft is formed on the upper portion without discharging the foreign matter pumped up together with the oil to the sliding portion between the crankshaft and the main bearing. It is equipped with measures to prevent foreign matter from being transferred to the oil supply mechanism, preventing foreign particles such as wear powder mixed with oil from flowing into the sliding part from the oil supply mechanism, and preventing an increase in loss at the sliding part. In addition, it is possible to provide a highly reliable hermetic compressor that prevents the sliding portion from being worn or damaged.

  According to a first aspect of the present invention, oil is stored in a sealed container, and an electric element and a compression element driven by the electric element are accommodated. The compression element includes a piston, an eccentric shaft portion, and the like. And a main shaft portion, a lower end is immersed in the oil, a crankshaft having an oil supply mechanism for pumping the oil upward, a cylinder block having a cylindrical compression chamber, and a cylinder block A main bearing that pivotally supports the crankshaft, the oil supply mechanism includes a spiral groove carved on an outer periphery of the crankshaft, and the spiral groove causes foreign matter pumped together with the oil to pass through the crankshaft. It is provided with a foreign matter discharge preventing means that conveys to the upper part without discharging to the sliding portion with the main bearing, and the oil is prevented by the foreign matter discharge preventing means of the spiral groove. Prevents foreign matter such as wear powder from flowing out to the sliding part, prevents an increase in loss at the sliding part, prevents wear and damage to the sliding part, and is a highly reliable sealed type A compressor can be provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the foreign matter discharging means includes a side wall in the counter-rotating direction of the spiral groove and a bottom portion on the axial center side of the crankshaft in the cross section of the crankshaft. It is formed so that the angle formed is an acute angle, and foreign matters such as oil and wear powder flow around the side wall of the spiral groove with an acute angle by centrifugal force, and since it is an acute angle, it flows out to the sliding part In addition to the effects of the invention described in claim 1, it is possible to more reliably prevent foreign matter such as wear powder from flowing out to the sliding portion.

  According to a third aspect of the present invention, in the first aspect of the present invention, the foreign matter discharging means has a substantially trapezoidal shape in the cross section of the crankshaft, and the lower bottom of the trapezoid is located on the axis side of the crankshaft. The top of the trapezoidal shape is the opening of the spiral groove, and the upper base is formed shorter than the lower bottom, and the two corners at the end points of the bottom of the trapezoidal shape of the spiral groove are acute angles. The foreign matter such as oil and wear powder flows due to centrifugal force in the vicinity of the lower bottom of the trapezoidal shape of the acute spiral groove, and since it has an acute angle, it is difficult to flow out from there to the sliding portion. In addition to the effect of the present invention, foreign matter such as wear powder can be more reliably prevented from flowing out to the sliding portion.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, which is inverter-driven at a plurality of operating frequencies, and the flow of oil in the spiral groove is slow during low-speed operation, Even when foreign matter such as wear powder stays in the spiral groove for a relatively long time or when foreign matter such as wear powder in the spiral groove is likely to flow out of the spiral groove due to a large centrifugal force during high speed operation, The foreign matter discharge prevention means prevents foreign matter such as wear powder mixed with oil from flowing out to the sliding part, prevents increase in loss at the sliding part, and prevents the sliding part from being worn or damaged. High reliability can be obtained even in energy-saving operation and high-function operation by inverter drive.

  Hereinafter, embodiments of a hermetic compressor according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a side surface of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a front view of a crankshaft of the hermetic compressor according to the same embodiment. FIG. 3 is a cross-sectional view of a main part taken along line AA in FIG.

  2 and 3 indicate the rotation direction of the crankshaft.

  1 to 3, oil 102 is stored in a sealed container 101, and an electric element 105 including a stator 103 and a rotor 104 and a compression element 106 driven by the electric element 105 are accommodated.

  The compression element 106 includes a piston 111, an eccentric shaft portion 112, and a main shaft portion 113.

  Furthermore, a crankshaft 115 having an oil supply mechanism 114 having a lower end immersed in the oil 102 and pumping the oil 102 upward, a cylinder block 122 having a cylindrical compression chamber 121, and a crankshaft formed in the cylinder block 122. And a main bearing 123 that pivotally supports 115.

  The oil supply mechanism 114 communicates with the lower end of the spiral groove 124 formed on the outer periphery of the crankshaft 115, and the upper end of the spiral groove 124 communicates with the oil flow path 125 provided in the eccentric shaft portion 112. The other end of the oil passage 125 is opened at the upper end surface of the eccentric shaft portion 112.

  Further, the spiral groove 124 includes foreign matter discharge preventing means 131 that transports the foreign matter pumped up together with the oil 102 to the upper portion without being discharged to the sliding portion between the crankshaft 115 and the main bearing 123.

  In the cross section in the vicinity of the spiral groove 124 of the crankshaft 115 shown in FIG. 3, the foreign matter discharge preventing means 131 has a substantially trapezoidal shape, and the lower base of the trapezoid is the bottom 133 on the axis side of the crankshaft 115. The upper base of the shape is the opening 134 of the spiral groove 124, and the upper base is formed shorter than the lower base, and is formed by the side surface 135 of the spiral groove 124 in the counter-rotating direction and the bottom portion 133 on the axial center side. And an acute angle portion 132.

  The operation of the compressor configured as described above will be described below.

  When the electric element 105 is energized, the electric element 105 is activated and the rotor 104 rotates. Then, the crankshaft 115 that is integrally mounted with the rotor 104 rotates, and the movement of the eccentric shaft portion 112 of the crankshaft 115 is converted into the reciprocating motion of the piston 111 of the compression element 106. It reciprocates in the interior and sucks and compresses the refrigerant in the compression chamber 121.

  The oil 102 stored in the sealed container 101 is pumped upward by an oil supply mechanism 114 attached to the lower end of the crankshaft 115 by centrifugal force generated by the rotation of the crankshaft 115, and passes through a spiral groove 124 provided in the crankshaft 115. And is supplied to the sliding portion of the main bearing 123.

  The oil 102 that has reached the main bearing 123 by the spiral groove 124 is further lifted upward, and is supplied to the eccentric shaft portion 112 through the oil passage 125 that communicates with the spiral groove 124.

  The oil 102 supplied to the eccentric shaft portion 112 is discharged from the opening of the oil passage 125 on the upper end surface of the eccentric shaft portion 112 into the space in the sealed container 101.

  Here, when foreign matter such as wear powder is mixed in the oil 102, the foreign matter such as wear powder is pumped up from the oil supply mechanism 114 of the crankshaft 115 together with the oil 102 and reaches the spiral groove 124.

  At this time, foreign matter such as abrasion powder that has entered the spiral groove 124 is heavier than the oil 102, so that the rotational force of the crankshaft 115 causes the side surface 135 of the spiral groove 124 in the counter-rotating direction and the bottom 133 on the shaft core side. It gathers at the formed acute angle part 132 and is conveyed to the upper part.

  Foreign matter such as abrasion powder gathered at the acute angle portion 132 accumulates in the acute angle portion 132 due to the centrifugal force of rotation and becomes difficult to flow out to the opening portion 134, so it is difficult to flow out to the sliding portion, and along with the oil 102 along the spiral groove 124. And is discharged from the tip of the eccentric shaft portion 112 into the sealed container 101 through the oil flow path 125.

  As a result, foreign matter such as abrasion powder can be prevented from flowing out to the sliding portion, and only the oil 102 is supplied to the sliding portion to prevent an increase in loss at the sliding portion, It is possible to provide a highly reliable hermetic compressor that prevents the sliding portion from being worn or scratched by foreign matter.

  Needless to say, the angle and shape of the acute angle portion 132 may be any as long as the oil 102 flowing in the spiral groove 124 can be stored by the centrifugal force of rotation.

  In addition, when the inverter is driven at a low speed, the pumping amount of the oil 102 is reduced, the flow of the oil 102 in the spiral groove 124 is slow, and foreign matters such as wear powder stay in the spiral groove 124 for a relatively long time. The time until the oil flows into the upper oil passage 125 becomes longer, and the possibility of flowing out to the sliding portion between the crankshaft 115 and the main bearing 123 increases.

  However, foreign matter such as abrasion powder accumulates in the acute angle portion 132 due to the centrifugal force of rotation and is difficult to flow out to the opening portion 134, and thus is difficult to flow out to the sliding portion of the crankshaft 115 and the main bearing 123, and along the spiral groove 124. The oil 102 is pushed upward together with the oil 102, and is discharged into the sealed container 101 from the tip of the eccentric shaft portion 112 through the oil passage 125.

  As a result, even when the amount of oil 102 flowing through the spiral groove 124 is small, foreign matter such as abrasion powder can be prevented from flowing out to the sliding portion, and only the oil 102 is supplied to the sliding portion. In addition to preventing an increase in loss, it is possible to provide a highly reliable hermetic compressor by preventing the sliding portion from being worn or damaged by foreign matter such as wear powder.

  Further, when the inverter is driven at high speed, the centrifugal force acting on the oil 102 in the spiral groove 124 of the crankshaft 115 becomes large, and foreign matters such as wear powder are likely to flow out to the sliding portion of the crankshaft 115.

  However, foreign matter such as abrasion powder accumulates in the acute angle portion 132 due to the centrifugal force of rotation and is difficult to flow out to the opening portion 134, and thus is difficult to flow out to the sliding portion of the crankshaft 115 and the main bearing 123, and along the spiral groove 124. The oil 102 is pushed upward together with the oil 102, and is discharged into the sealed container 101 from the tip of the eccentric shaft portion 112 through the oil passage 125.

  As a result, even when the centrifugal force acting on the oil 102 in the spiral groove 124 is large, foreign matter such as wear powder can be prevented from flowing out to the sliding portion. It is possible to provide a highly reliable hermetic compressor by preventing an increase in loss at the moving part and preventing wear and damage of the sliding part due to foreign matters such as wear powder.

  In the present embodiment, the spiral groove 124 has a substantially trapezoidal cross section. However, the corner portion formed by the side surface 135 and the bottom portion 133 in the counter-rotation direction in which oil accumulates with respect to the rotation direction of the crankshaft. If the obtuse angle part is formed, the same effect can be obtained even if the cross-sectional shape of the spiral groove 124 is a substantially parallelogram, a triangle, or other shapes.

  In addition, if the shape allows foreign matter and oil to be collected and transported to the upper part by centrifugal force due to rotation, the foreign matter discharge preventing means can be similarly implemented as long as it has a shape that functions in the same way even if it is not an acute angle part. is there.

  Further, in the present embodiment, the foreign matter discharge preventing means 131 is provided in the spiral groove 124 of the crankshaft 115, but the cross-sectional shape of the present embodiment is provided in the eccentric shaft portion 112 and other sliding portions of the thrust portion. The same effect can be obtained even if it is used for the provided oil supply groove.

  As described above, the hermetic compressor according to the present invention can stably supply sufficient oil by an oil supply mechanism using a pressure difference. It can be applied to all uses using refrigeration cycles such as showcases and vending machines.

1 is a longitudinal sectional view of a side surface of a hermetic compressor according to Embodiment 1 of the present invention. Front view of crankshaft of hermetic compressor in the same embodiment Sectional drawing of the principal part in the AA line of FIG. A longitudinal sectional view of the side of a conventional hermetic compressor Front view of conventional crankshaft Sectional drawing of the principal part in the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 102 Oil 105 Electric element 106 Compression element 111 Piston 112 Eccentric shaft part 113 Main shaft part 114 Oil supply mechanism 115 Crankshaft 121 Compression chamber 122 Cylinder block 123 Main bearing 124 Spiral groove 131 Foreign matter discharge prevention means

Claims (4)

  Oil is stored in a sealed container, and an electric element and a compression element driven by the electric element are accommodated, and the compression element includes a piston, an eccentric shaft portion, and a main shaft portion, and a lower end of the compression element. A crankshaft having an oil supply mechanism immersed in oil and pumping the oil upward; a cylinder block having a cylindrical compression chamber; and a main bearing formed on the cylinder block and supporting the crankshaft. The oil supply mechanism includes a spiral groove carved on an outer periphery of the crankshaft, and the spiral groove discharges foreign matter pumped up together with the oil to a sliding portion between the crankshaft and the main bearing. A hermetic compressor provided with a foreign matter discharge preventing means for transporting it to the top without any trouble.   2. The sealed type according to claim 1, wherein the foreign matter discharging means is formed so that an angle formed by a side wall in a counter-rotating direction of the spiral groove and a bottom portion on the axial center side of the crankshaft is an acute angle in a cross section of the crankshaft. Compressor.   In the cross section of the crankshaft, the foreign matter discharging means has a substantially trapezoidal spiral groove, the lower base of the trapezoid is the bottom on the axis side of the crankshaft, and the upper base of the trapezoid is the opening of the spiral groove. The hermetic compressor according to claim 1, wherein the upper base is formed shorter than the lower base.   The hermetic compressor according to any one of claims 1 to 3, which is inverter-driven at a plurality of operating frequencies.

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