JP2005139997A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor having reduced cost by disusing a chip seal and having higher efficiency and reliability by providing a lubrication hole and a lap upper face groove to secure the amount of lubrication almost equal to that in using the chip seal and a chip seal groove. <P>SOLUTION: An oil supply passage is provided on the lap upper face of the scroll compressor and in addition a lubrication passage is provided on the lap upper face and a lap side face to secure a lubrication amount in the compressor. Thus, the scroll compressor has higher efficiency and reliability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor used in the field of refrigeration and air conditioning.

Combine the fixed scroll and the orbiting scroll to form the scroll wrap on the end plate, and apply a constant pressure to the back of the orbiting scroll component end plate so that the end plate parts of both scroll parts are in close contact to form a compression chamber, The orbiting scroll component is connected to a crankshaft having an eccentric portion while preventing rotation by arranging an Oldham ring on the rear surface of the end plate, and the orbiting scroll component is connected to the orbiting scroll using a rotary motion by an electric motor provided on the crankshaft main shaft portion. In the scroll compressor having a configuration in which compression is performed while reducing the volume toward the center by performing a orbiting motion, and the discharge is provided from a discharge hole provided in the center, the fixed scroll and the orbiting scroll are on top of each other during operation. And sliding with a thin film of oil at the bottom of the lap, Galling, which is a factor causing the reliability deterioration such as image sticking due to friction because sometimes metal contact in.
JP-A-6-288361

  In the conventional technique, the leakage loss is reduced by the tip seal provided on the fixed scroll or the orbiting scroll, and oil is supplied from the oil supply hole provided to float the tip seal, and the tip seal is thereby lifted. At the same time, the inside of the compressor was lubricated to reduce leakage loss and ensure reliability, but the tip seal floatability was unstable due to operating conditions, and the number of parts increased, resulting in increased costs. As it increased, it was one of the factors that hindered high efficiency and low cost.

  The present invention makes it possible to reduce the cost by eliminating the tip seal, and by providing the oil supply hole and the wrap upper surface groove, it is possible to secure an oil supply amount substantially equivalent to that when the tip seal and the tip seal groove are provided. This is intended to provide a scroll compressor that can handle the above.

  In order to solve the conventional problem, a passage for supplying oil to the upper surface of the wrap of the orbiting scroll is provided, and a groove for efficiently supplying the oil supplied to the bottom surface of the wrap of the orbiting scroll is set. This makes it possible to ensure the reliability of the orbiting scroll and the fixed scroll equivalent to the conventional example.

  The present invention can improve the reliability of the orbiting scroll and the fixed scroll forming the compression chamber of the hermetic scroll compressor.

  In the first invention, an oil supply path is provided on the upper surface of the orbiting scroll. According to this configuration, since the amount of oil supply in the compression chamber is almost the same as when a conventional tip seal is provided, wear due to sliding of the wrap upper surface, side surface, and end plate surface of the orbiting scroll and fixed scroll, It can prevent galling and image sticking.

According to a second aspect, in the first aspect, a taper is provided on the oil supply path on the upper surface of the wrap of the orbiting scroll. According to this configuration, an oil supply path to the compression chamber can be further ensured, and wear, galling, seizure, and the like due to sliding of the upper surface, the side surface, and the end plate surface of the orbiting scroll and the fixed scroll can be prevented. It is possible to set the optimum oil supply amount that achieves both reliability.

  According to a third invention, in the first invention, a circumferential groove is provided in an oil supply path portion on the upper surface of the wrap of the orbiting scroll, and the wrap is extended toward the winding end portion. According to this configuration, an oil supply path is secured over the entire area, and wear, galling, seizure, and the like due to sliding of the wrap upper surface, side surface, and end plate surface of the orbiting scroll and fixed scroll can be prevented.

  According to a fourth aspect, in the third aspect, the start point and the end point of the circumferential groove provided in the orbiting scroll are formed in a slope shape. According to this configuration, stress concentration in the circumferential groove is avoided even when the wrap upper surface of the orbiting scroll and the lap bottom surface of the fixed scroll are in contact with each other. It is possible to prevent abrasion, galling, and seizure.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a vertical oil supply groove is provided on the bottom surface of the orbiting scroll. According to this configuration, it is possible to more efficiently supply the bottom surface of the orbiting scroll to the wrap bottom surface, thereby preventing wear, galling, seizure, etc. caused by sliding of the top surface, side surface, and end plate surface of the orbiting scroll and fixed scroll. can do.

(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 by a trochoid pump 7 which is given a rotational motion by the crankshaft 8, and is guided to the eccentric bearing inner space 10 of the orbiting scroll part through the lubricating oil supply hole 9 inside the crankshaft 8. It is burned. 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. Further, the oil supplied to the suction chamber 3 moves to the compression chamber 5 along with the swiveling motion, and serves to prevent leakage between the compression chambers. The other oil flow path is led to an oil supply path 18 provided in the height direction of the wrap 17 of the orbiting scroll component 4 as shown in FIG. 2 and directly supplied to the compression chamber 5. By providing the oil supply hole 18, the amount of oil supply in the compression chamber is secured at the same time, so that it is possible to prevent wear, galling, seizure, and the like due to sliding of the lap top surface 19, the side surface 20, and the bottom surface 21.

(Embodiment 2)
A tapered shape 22 is provided at the upper surface opening of the oil supply hole 18 provided in the lap 18 of the orbiting scroll component 4 shown in FIG. If it is necessary to increase the oil supply amount, the oil supply amount can be optimized by increasing the oil supply amount, and wear due to sliding of the lap top surface 19, the side surface 20, and the bottom surface 21, galling, and seizure is ensured. Etc. can be prevented.

(Embodiment 3)
A circumferential groove 23 is provided in the upper surface opening of the oil supply hole 18 on the lap upper surface 19 of the orbiting scroll component 4 shown in FIG. The depth of the circumferential groove 23 can be increased if it is necessary to increase the amount of oil supplied, and the amount of oil supplied can be optimized. In addition, the oil is supplied in a wider range because it is extended toward the end of the wrap winding. Thus, the wear, galling, seizure, and the like due to sliding of the wrap upper surface 19, the side surface 20, and the bottom surface 21 can be prevented.

(Embodiment 4)
A circumferential groove 23 is provided in the upper surface opening of the oil supply hole 18 on the lap upper surface 19 of the orbiting scroll component 4 shown in FIG. As a result, even if the upper surface 20 of the orbiting scroll lap contacts the bottom surface of the fixed scroll lap, stress concentration does not occur at both ends of the circumferential groove 22, and wear due to sliding of the upper surface 19, the side surface 20, and the bottom surface 21 of the orbiting scroll , Seizure and the like can be prevented.

(Embodiment 5)
A vertical oil path 25 extending to the lap bottom surface 21 is provided on the lap side surface 20 of the orbiting scroll component 4 shown in FIG. As a result, oil can be more efficiently supplied to the wrap bottom surface 21 of the orbiting scroll, and wear, galling, seizure, and the like due to sliding of the wrap bottom surface 21 of the orbiting scroll can be prevented. However, in that setting, it is necessary to set the depth or the like so as not to cause a leakage loss with the wrap side surface of the fixed scroll.

  As described above, the hermetic scroll compressor according to the present invention achieves high performance by reducing leakage loss compared to the conventional tip seal type compressor, and the reliability of the orbiting scroll and the fixed scroll is improved. A compressor that does not impair the performance can be provided.

Sectional drawing of the scroll compressor which shows the Example of this invention Orbiting scroll component diagram showing another embodiment of the present invention Orbiting scroll component diagram showing another embodiment of the present invention Orbiting scroll component diagram showing another embodiment of the present invention Fixed scroll component diagram and enlarged view showing another embodiment of the present invention Orbiting scroll component diagram showing another embodiment of the present invention

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 Lap 18 Oil supply hole 19 Lap top surface 20 Lap side surface 21 Lap bottom surface 22 Tapered shape 23 Circumferential groove 24 Slope 25 Oil path

Claims (5)

A plurality of compression chambers are formed by meshing fixed scroll parts and swirl scroll parts formed with spiral wraps on the end plates, and by applying a constant pressure to the back of the orbiting scroll parts, the end plate parts of both scroll parts are brought into contact with each other, and A scroll compressor comprising a rotation restraint component on the back of the orbiting scroll component, preventing the rotation of the orbiting scroll component to perform a revolving motion, and compressing while reducing the volume toward the center of the compression chamber, A scroll compressor that reduces a leakage gap generated between the wrap upper surface of the orbiting scroll and the lap bottom surface of the fixed scroll without providing a seal material on the wrap upper surface of the orbiting scroll only by a selected combination dimension and an oil seal, Inside the compression chamber by providing an oil supply hole on the upper surface of the orbiting scroll wrap Scroll compressor, characterized in that increasing the amount of oil. The scroll compressor according to claim 1, wherein an oil supply amount inside the compressor is increased by providing a taper portion in the opening of the oil supply hole on the upper surface of the wrap of the orbiting scroll. A circumferential groove is provided in the opening of the oil supply hole on the upper surface of the wrap of the orbiting scroll, and the circumferential groove extends in the direction of the end of the wrap winding to increase the amount of oil supplied inside the compressor, and the end of winding of the orbiting scroll. The scroll compressor according to claim 1, wherein the scroll compressor can be supplied to the side. Stress at the periphery of the circumferential groove even when the top surface of the scroll wrap and the bottom surface of the fixed scroll wrap are in contact with each other while increasing the amount of oil in the compressor by making the start point and end point of the circumferential groove have a slope shape. 4. The scroll compressor according to claim 3, wherein concentration is eliminated. 5. An oil supply path to the bottom surface of the orbiting scroll is provided while increasing the amount of oil supply in the compressor by providing a vertical groove on the side surface of the orbiting scroll around the circumferential groove. The scroll compressor in any one.

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