KR100608873B1 - Structure for feeding oil of gear compressor - Google Patents

Abstract

The present invention relates to an oil supply structure of a gear compressor, and the present invention relates to a sealed container filled with oil on a bottom surface, a cylinder, an outer gear rotatably inserted into the cylinder, and inserted into the outer gear. An inner gear in contact with the outer gear to form a plurality of compression spaces, an upper bearing and a lower bearing coupled to both sides of the cylinder to seal the compression spaces, and inserted into the upper and lower bearings and the inner gear inserted therein. In a gear compressor including a rotary shaft coupled to the oil compressor, an oil flow path for guiding oil of the bottom surface of the sealed container is supplied between the inner gear and the inner gear and a bearing moving relative to the inner shaft through the rotary shaft. Because of this, it is possible to smoothly supply oil to the bearing supporting the rotating shaft as well as to smoothly supply the oil between the inner gear that rotates by receiving the rotational force of the rotary shaft and the parts moving relative to the inner gear.

Description

STRUCTURE FOR FEEDING OIL OF GEAR COMPRESSOR}             

1,2 is a front sectional view and a plan view of a gear compressor equipped with one embodiment of a gear compressor oil supply structure of the present invention;

3 is a cross-sectional view showing a modification of the second oil groove constituting the gear compressor oil supply structure;

Figure 4 is a front sectional view showing an operating state of the gear compressor oil supply structure of the present invention.

<Description of the symbols for the main parts of the drawings>

One; Sealed container 10; cylinder

20; Outer gear 30; Inner gear

40; Rotation axis 50; Upper bearing

60; Lower bearing 63; First oil groove

64,34; Annular groove 65; Connecting groove

70; Oil feeder F1; Oil hole

G2; Second oil groove P; Compression space

The present invention relates to a gear compressor, and in particular, it is possible to smoothly supply oil to a bearing supporting the rotating shaft as well as to smoothly supply the oil between the rotating inner gear and the inner gear and the parts moving relative to the rotating shaft. It relates to an oil supply structure of a gear compressor.

Generally, a compressor converts electrical energy into kinetic energy and compresses refrigerant gas by the kinetic energy. Compressors are a key component of the refrigeration cycle system, and there are various types of compressors, such as rotary compressors, scroll compressors, and reciprocal compressors, depending on a compression mechanism for compressing refrigerant. Such compressors are used in refrigerators, air conditioners and showcases.

In the rotary compressor, the rotational force of the driving motor is transmitted to the rotary shaft, and the rotary shaft rotates, and the eccentric portion provided on one side of the rotary shaft rotates in the compression space of the cylinder block according to the rotation of the rotary shaft. As the eccentric portion rotates in the compression space of the cylinder block, the refrigerant gas is sucked, compressed and discharged while changing the volume of the compression space of the cylinder block together with the vanes provided in the cylinder block. Such a rotary compressor discharges compressed gas once as the driving motor rotates once.

In the scroll compressor, the rotational force of the driving motor is transmitted to the rotational shaft so that the rotational shaft rotates. As the rotating shaft rotates, the rotating scroll coupled to the rotating shaft engages with the fixed scroll and rotates to suck, compress and discharge the refrigerant gas. Such a scroll compressor discharges compressed gas twice in succession as the driving motor rotates once.

In the reciprocating compressor, the rotational force of the drive motor is transmitted to the crankshaft and the crankshaft rotates. As the crank shaft rotates, the piston coupled to the crank shaft sucks, compresses and discharges the refrigerant gas while linearly reciprocating in the compression space of the cylinder block. Such a reciprocating compressor discharges compressed gas once as the driving motor rotates once.

On the other hand, in addition to the compressors described above, a first gear having a plurality of gears formed on the inner circumferential surface and a second gear having a smaller number of gears than those of the first gear are formed on the outer circumferential surface and engaged with the first gear to rotate. There is a compression mechanism. Such a compression mechanism is to engage the first gear and the second gear in one rotation to discharge the compressed gas continuously a plurality of times. Such a gear compressor is superior in compression efficiency and stability than other compressors, and research and development on this is underway.

However, the compression mechanism using the gears has a big disadvantage that the relative movement between the gears as well as the parts supporting the gears is increased because the gears are engaged with each other in rotational motion. have. Therefore, it is important to minimize wear between gears and relative moving parts when designing and manufacturing a compressor.

The present invention is to solve the above-described point, an object of the present invention is to smoothly supply oil between the inner gear and the inner gear that rotates by receiving the rotational force of the rotary shaft and the inner gear and the rotational shaft smoothly An oil supply structure of a gear compressor is provided to smoothly supply oil to a supporting bearing.

In order to achieve the object of the present invention as described above, the bottom surface is filled with an oil-filled container, a cylinder, an outer gear rotatably inserted into the cylinder, and an outer gear inserted into the outer gear; An inner gear contacting together to form a plurality of compression spaces, an upper bearing and a lower bearing coupled to both sides of the cylinder to seal the compression spaces, and a rotating shaft inserted into the upper and lower bearings to be coupled to the inner gears. A gear compressor comprising: an oil flow path for guiding oil of the bottom surface of the hermetically sealed container to be supplied between the inner gear and the inner gear and the lower bearing relative to the inner shaft through the rotating shaft. An oil supply structure is provided.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of the oil supply structure of the gear compressor which concerns on this invention is described in detail based on an accompanying drawing.

1 and 2 are a front sectional view and a plan view showing a gear compressor equipped with an embodiment of the gear compressor oil supply structure of the present invention.

As shown in the drawing, the gear compressor includes an airtight container 1 filled with oil on a bottom surface thereof, a power mechanism unit 80 mounted on a bottom surface of the airtight container 1 to generate rotational force, and the power mechanism unit 80. It is mounted in the closed container (1) so as to be located on the upper side of the transmission mechanism 80 is configured to include a compression mechanism for compressing the gas receives the driving force.

The compression mechanism part includes a cylinder 10 having a gear insertion hole 11 formed therein, and a plurality of gear teeth 21 formed on an inner circumferential surface thereof and rotatably inserted into the gear insertion hole 11 of the cylinder. 20 and a plurality of gear teeth 31 are formed on the outer circumferential surface and rotatably inserted into the outer gear 20 to form a plurality of compression spaces P together with the gear teeth 21 of the outer gear. An inner gear 30, a rotating shaft 40 inserted into and coupled to the inner gear 30, and coupled to upper and lower portions of the cylinder 10 to cover the compression spaces P are respectively connected to the rotating shaft 40. It comprises a support upper bearing 50 and the lower bearing 60. An oil flow path is formed to guide oil of the bottom surface of the sealed container to be supplied between the inner gear 30 and the lower bearing 60 relative to the inner gear 30 through the rotation shaft 40.

The cylinder 10 has a gear insertion hole 11 formed eccentrically with the center of the body portion 12 in the body portion 12 having a predetermined thickness and area.

The outer gear 20 is provided with a plurality of gear teeth 21 formed on the inner circumferential surface of the gear body portion 22 having an area and a predetermined thickness corresponding to the gear insertion hole 11.

The inner gear 30 has a plurality of gear teeth 31 are formed on the outer circumferential surface of the gear body portion 32 having a predetermined thickness and a circular shape and is coupled to the rotating shaft 40 in the center of the gear body portion 32. A shaft engaging hole 33 is formed. The inner gear 30 is rotatably inserted into the outer gear 20, and the teeth 31 of the inner gear 30 and the teeth 21 of the outer gear 20 have a plurality of contact points. At the same time to form a plurality of compression space (P).

The rotating shaft 40 includes a shaft portion 41 formed in a rod shape having a predetermined length and an oil hole F1 penetrating through the shaft portion 41. The oil hole F1 is formed to be bent and extended to the first oil hole 42 and the first oil hole 42 formed at a predetermined length in the longitudinal direction at one end of the shaft portion 41, and thus the lower bearing ( And a second oil hole 43 formed through the outer circumferential surface facing the 60 side.

The rotary shaft 40 is pressed into the shaft engaging hole 33 of the inner gear and is coupled to the power mechanism. One side of the rotating shaft 40 is immersed in the oil filled on the bottom surface of the sealed container (1). An oil feeder 70 pumping oil by the rotational force of the rotating shaft 40 when the rotating shaft 40 is rotated in the oil hole F1 located at one end of the rotating shaft 40 immersed in the oil. Is mounted.

The upper bearing 50 is provided with a shaft insertion hole 52 in which the rotating shaft 40 is rotatably inserted in the center of the body portion 51 having a predetermined shape.

The lower bearing 60 is formed through the center of the body portion 61 and the body portion 61 having a predetermined shape, the shaft insertion hole 62 is rotatably inserted into the rotating shaft 40, and the shaft The first oil groove 63 formed on the inner circumferential surface of the insertion hole 62 and the second oil groove G2 formed on the upper surface of the body portion 61 and connected to the first oil groove 63 are formed. It is made. The first oil groove 63 is formed in a spiral shape having a predetermined width and depth on the inner circumferential surface of the shaft insertion hole 62.

The second oil groove G2 has an annular groove 64 formed in an annular shape to have a predetermined width and depth on the upper surface of the lower bearing 60 in contact with the inner gear 30, and the annular groove 64. It consists of a connecting groove 65 for connecting the first oil groove (63).

In another modified example of the second oil groove G2, as shown in FIG. 3, the first oil groove 63 is connected to an edge of the upper shaft insertion hole 62 of the lower bearing 60. An annular groove formed in an annular shape having a predetermined width and depth on the lower surface of the inner groove 30 facing the upper surface of the lower bearing 60 and the connecting groove 65 formed to be connected to the connecting groove 65. 34).

The upper bearing 50 and the lower bearing 60 are respectively coupled to both sides of the cylinder 10 such that the shaft insertion holes 52 and 62 are inserted into the rotation shaft 40. At this time, the upper bearing 50 and the lower bearing 60 are in contact with both side surfaces of the inner gear 30 and the outer gear 20 to the gear teeth 31 and the gears of the outer gear 20 of the inner gear 30. The plurality of compression spaces P formed by the teeth 21 are sealed. The rotary shaft 40 is supported by the inner circumferential surface of the shaft insertion hole 52 of the upper bearing and the inner circumferential surface of the shaft insertion hole 62 of the lower bearing.

The cylinder 10, the upper bearing 50 and the lower bearing 60 are coupled to each other by being fastened by a plurality of bolts (not shown).

The oil flow path includes an oil hole F1 formed in the rotation shaft 40, a first oil groove 63 formed in the lower bearing 60, and the second oil groove G2.

The power mechanism 80 includes a stator 81 fixedly coupled to the hermetic container 1, and a rotor 82 rotatably inserted into the stator 81. The rotary shaft 40 is press-fitted into the rotor 82 is fixedly coupled.

Reference numeral 2 is a suction pipe, 3 is a discharge pipe, and 90 is a discharge means.

Hereinafter, the operational effects of the gear compressor oil supply structure of the present invention will be described.

First, when power is applied to the compressor, the rotor 82 is rotated by the interaction between the stator 81 and the rotor 82, and the rotational force of the rotor 82 is transmitted to the inner gear through the rotation shaft 40. It is transmitted to 30 so that the inner gear 30 is rotated.

When the inner gear 30 is rotated, a rotational force is transmitted to the outer gear 20 in contact with the inner gear 30 at multiple points, and the outer gear 20 rotates together. A plurality of contact points are made between the teeth 31 of the inner gear 30 and the teeth 21 of the outer gear 20 by the difference between the completion of the inner gear 30 and the completion of the outer gear 20. A plurality of compression spaces P are formed.

As the inner gear 30 rotates, the positions of the contact points of the inner gear 30 and the outer gear 20 are changed while the outer gear 20 rotates together, and at the same time, the volume of the compression spaces P is reduced. Are converted respectively. As the volume of the compression spaces P changes, the gas sucked through the suction pipe is compressed through suction means (not shown) provided in the cylinder 10 or the upper and lower bearings 50 and 60. It is sucked into (P), compressed and discharged.

When the number of teeth of the outer gear 20 is seven and the number of teeth of the inner gear 30 is six, six compression spaces P are formed and one compression space P is made every time the inner gear 30 is rotated by 60 degrees. Compressed gas is discharged. In addition, each time the inner gear 30 is rotated by 60 degrees, each compression space (P) is the same shape.

Meanwhile, as shown in FIG. 4, as the rotary shaft 40 rotates, the oil feeder 70 rotates together to pump oil filled in the bottom surface of the sealed container 1 to rotate the rotary shaft 40. The oil is pumped into the oil hole (F1). If the oil feeder 70 does not have the oil hole F1 of the rotary shaft 40 inclined with respect to the center of the rotary shaft 40, when the rotary shaft 40 rotates, the bottom surface of the sealed container 1 The filled oil is sucked up through the oil hole F1.

The oil pumped through the oil hole F1 is supplied to the first oil groove 63 in communication with the oil hole F1 and is supplied between the rotary shaft 40 and the lower bearing 60. Most of the oil supplied to the first oil groove 63 is supplied to the connecting groove 65 and the annular grooves 34 and 64, which are the second oil grooves G2. The oil supplied to the second oil groove G2 is supplied between the inner gear 30 and the lower bearing 60 to be lubricated, so that the oil moves between the inner gear 30 and the lower bearing 60 relative to each other. It not only reduces friction, but also minimizes wear. In addition, a part of the oil lubricating between the inner gear 30 and the lower bearing 60 is introduced between the inner gear 30 and the outer gear 20 to between the inner gear 30 and the outer gear 20. To minimize friction and wear.

When the inner gear 30 rotates, frictional force is greatly increased by the weight of the inner gear 30 between the lower surface of the inner gear 30 and the upper surface of the lower bearing 60 supporting the inner gear 30. In addition to the oil supply is not smooth, but the oil supplied through the oil hole (F1) and the first oil groove 63 is supplied to the lower surface of the inner gear 30 or the upper surface of the lower bearing (60). Not only is it smoothly supplied through the formed annular grooves 34 and 64, but the lubrication between the two parts is smooth.

As described above, in the gear compressor oil supply structure of the present invention, the oil supply is smoothly provided between the rotating shaft and the lower bearing supporting the rotating shaft during the operation of the compressor, and the lower bearing moves relative to the inner gear and the inner gear. The smooth oil supply between them reduces the friction between the rotating shaft and the lower bearings and between the inner gear and the lower bearings, as well as minimizes wear, thereby reducing power loss and extending the life of the parts, increasing reliability. have.

Claims (7)

An oil filled container at the bottom, a cylinder, an outer gear rotatably inserted into the cylinder, and an inner gear inserted into the outer gear and in contact with the outer gear to form a plurality of compression spaces. In the gear compressor comprising a top bearing and a lower bearing coupled to both sides of the cylinder to seal the compression spaces, and a rotary shaft inserted into the upper and lower bearings and coupled to the inner gear, An oil hole formed in the rotating shaft to guide oil of the bottom surface of the sealed container to be supplied between the rotating shaft and the lower bearing, and a first hole formed in the lower bearing so that oil supplied through the oil hole flows between the rotating shaft and the lower bearing. And an oil groove and a second oil groove for guiding oil supplied through the first oil groove to be supplied between the inner gear and the lower bearing. delete 2. The oil supply structure of a gear compressor according to claim 1, wherein an oil feeder for pumping oil in accordance with the rotation of the rotating shaft is provided in the oil hole located at the end side of the rotating shaft. The oil supply structure of a gear compressor of claim 1, wherein the second oil groove is formed on an upper surface of a lower bearing in contact with a lower surface of the inner gear. The oil supply structure of a gear compressor of claim 1, wherein the second oil groove is formed on a lower surface of the inner gear in contact with the lower bearing. The oil supply structure of claim 1, wherein the second oil groove comprises an annular groove formed in an annular shape, and a connecting groove connecting the annular groove and the first oil groove. The oil supply structure of a gear compressor of claim 1, wherein the first oil groove is formed on an inner circumferential surface of a lower bearing in contact with the rotation shaft.

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