KR101172068B1 - Oil pumping apparatus for hermetic compressor - Google Patents

Abstract

The present invention relates to an oil pumping device of a hermetic compressor. The present invention is provided with a bushing 54 provided with a pumping chamber 56 in which oil pumping is performed, and at a position eccentric with respect to the center of rotation of the rotating shaft 50 which is rotated by a motor part. A pumping roller 60 which draws a predetermined circular trajectory in contact with the inner surface of the pump 56, and is supported by the vane spring 66 to protrude into the pumping chamber 56, and the tip of the pumping roller 60 The vane 64 which contacts and partitions the inner space of the pumping chamber 56, the path through which oil flows into the pumping chamber 56, and the oil from the pumping chamber 56, is formed on the rotating shaft 50. It is configured to include an oil path forming means for forming a path to the oil passage 52. Oil pumping apparatus according to the present invention having such a configuration can be pumped and supplied more smoothly to the oil to perform the cooling and lubrication action, there is an advantage to increase the operation reliability of the compressor.

Compressor, oil, pumping

Description

Oil pumping apparatus for hermetic compressor

1 is a longitudinal sectional view of a typical scroll compressor.

Figure 2 is a schematic cross-sectional view showing the configuration of the oil pumping apparatus according to the prior art.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

Figure 4 is a cross-sectional view showing the configuration of a preferred embodiment of the oil pumping device of the hermetic compressor according to the present invention.

5 is a cross-sectional view taken along the line AA ′ of FIG. 4.

6 and 7 are a plan view showing the configuration of the communication plate and cover constituting the embodiment of the present invention, respectively.

8 to 10 is a state diagram showing the operation of the embodiment of the present invention sequentially.

* Description of the symbols for the main parts of the drawings *

50: rotation shaft 52: oil euro

54: bushing 56: pumping chamber

58: eccentric pin 60: pumping roller

62: vaneslot 64: vanes

66: vanes spring 68: inlet hole

69: discharge hole 70: communication plate

72: entrance hole 74: connector

76: exit hole 78: cover

80: suction port 82: communication path

The present invention relates to a compressor, and more particularly, to an oil pumping device for transferring oil, which is cooled and lubricated in a heat generating part or a friction part of a compressor, to an oil flow path of a crankshaft.

1 is a longitudinal cross-sectional view of a typical scroll compressor. According to this, the scroll compressor has a casing (1) is formed in its appearance, a closed space is formed inside the casing (1). The casing (1) is composed of an upper cap (1a), the outer shell (1b) and the lower cap (1c), the suction pipe (2) for sucking the working fluid from the outside through the casing (1), and the compressed operation The discharge pipe 3 which discharges a fluid is provided. And the oil storage unit (1d) for storing the oil is formed on the lower cap (1c) of the casing (1).

The motor unit 4 is installed inside the casing 1. The motor unit 4 is composed of a stator 4a fixed inside the casing 1 and a rotor 4b for converting an electric force into a rotational force inside the stator 4a.

The rotary shaft 5 penetrated through the center of rotation of the rotor 4b transmits the rotational force of the rotor 4b to the compression mechanism 6. An oil pumping device 15 to be described below is provided at the lower end of the rotary shaft 5, and an oil supply hole 5b is formed therein to suck oil from the oil storage unit 1d and transfer the oil to the heat generating unit and the friction unit. do.

The compression mechanism (6) is composed of a fixed scroll (7), a swinging scroll (8) and an old dam ring (9). That is, the fixed scroll (7) has a fixed scroll (7a) of the involute shape, the discharge port (7b) is formed so that the compressed working fluid can be discharged in the center portion is fixed to the inside of the casing (1).

And the turning scroll (8) is provided with a turning scroll (8a) formed in the same involute shape corresponding to the fixed scroll (7a). At this time, the crescent-shaped space generated by the fixed scroll 7a and the swing scroll 8a are 180 degrees out of phase with each other to form four compression spaces at the same time. The old dam ring 9 is mounted between the upper frame 12 and the turning scroll 8 so as to convert the rotational movement of the rotary shaft 5 into the turning movement.

In addition, the high and low pressure separating plate 10 partitioning the inner space of the casing 1 into the high pressure part S1 and the low pressure part S2 is mounted above the fixed scroll 7. In addition, a check valve assembly 11 is mounted above the discharge port 7b to block the compressed working fluid of the high pressure part S1 from flowing back to the inside of the compression space P.

The upper frame 12 is fixed to the upper inner side of the outer shell (1b) is provided with a compression mechanism (6) at the top. And the lower frame 13 is installed in the lower inner side of the outer shell (1b). At this time, the upper frame 12 supports the upper end of the rotary shaft 5 and the lower frame 13 supports the lower end of the rotation shaft (5). In addition, an oil passage 12a is formed in the upper frame 12 toward the edge so that the oil supplied to the compression mechanism 6 through the rotary shaft 5 can be recovered to the oil storage 1d.

Here, the configuration of the oil pumping device 15 provided in the lower portion of the rotary shaft 5 will be briefly described with reference to FIGS. 2 and 3.

A pumping chamber 16 is formed in the lower frame 13 to open downward. An eccentric pin 17 is formed at the end of the rotating shaft 5 to extend into the pumping chamber 16. A pumping roller 18 is installed on the eccentric pin 17 so that the eccentric pin 17 revolves by the rotation of the rotary shaft 5 so that the pumping roller 18 has two regions inside the pumping chamber 16. Divide by. An indentation portion 16 'is formed on an inner surface of the pumping chamber 16 vertically and long, and a partition plate 18' protruding from an outer surface of the pumping roller 18 is seated on the inlet portion 16 '. . One side of the pumping roller 18 contacts the inner surface of the pumping chamber 16 and divides the internal space of the pumping chamber 16 into two by the partition plate 18 '.

The communication plate 19 is installed to block the lower portion of the pump chamber 16. A total of three holes are drilled in the communication plate 19. That is, the inlet hole 20, the connection hole 26 and the outlet hole 22. The inlet hole 20 is a portion through which the oil delivered through the suction port 25 to be described below is delivered to the pumping chamber 16, and the connection hole 26 discharges oil from the pumping chamber 16. The outlet hole 22 is a passage for delivering oil to the oil passage 5b of the rotary shaft 5.

A cover 24 is provided on the lower surface of the communication plate 19. A suction port 25 is formed in the cover 24 so as to be immersed in the oil of the oil reservoir 1d. The cover 24 is also provided with a communication path 26 for connecting the connection hole 21 and the outlet hole 22.

However, the prior art having such a configuration has the following problems.

The pumping roller 18 has a partition plate 18 'inserted into the concave inlet 16', and the pumping chamber 16 in the outer surface of the pumping roller 18 by the eccentric rotation of the eccentric pin 17. While the part in contact with the inner surface of the different, the oil coming from the inlet hole 20 side to the connection hole 26 is sucked into the oil passage (5b) through the communication path 26 and the outlet hole 22 Be sure to

However, the pumping roller 18 may be divided into two regions of the inside of the pumping chamber 16 only when one side of the pumping roller 18 and the partition plate 18 ′ are exactly in contact with the inner surface of the pumping chamber 16. In the configuration, the pumping chamber 16 is not in close contact with the inner surface. Therefore, as the oil leaks to another area in the pumping chamber 16 itself, there is a problem that a relatively small amount of oil is transferred to the oil flow path 5b and thus the oil supply is not smooth. In particular, when the pump is operated at a relatively low frequency in the compressor operated by the inverter method is a problem that the oil pumping is not properly.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and to provide an oil pumping device in which oil pumping is performed more smoothly.

According to a feature of the present invention for achieving the above object, the present invention is provided with a bushing provided with a pumping chamber in which the oil pump is made, and in an eccentric position with respect to the rotation center of the rotating shaft rotated by the motor part. A pumping roller which draws a predetermined circular trajectory such that at least one side is in contact with the inner surface of the pumping chamber, and is supported by an elastic member to protrude into the pumping chamber and the tip is in contact with the pumping roller to open the inner space of the pumping chamber. And a vane for partitioning, and oil path forming means for forming a path through which oil flows into the pumping chamber and a path through which oil from the pumping chamber is transferred to an oil channel of the rotating shaft.

The vanes are seated in and out of the vane slot formed vertically along the inner wall of the pumping chamber, and the inflow and outflow holes through which oil flows into and out of the pumping chamber are respectively drilled at portions corresponding to both ends of the vane slot.

The oil path forming means constitutes a bottom surface of the pumping chamber and communicates with the inlet hole communicating with the inlet hole of the pumping chamber, the connecting hole communicating with the outlet hole of the pumping chamber, and the outlet hole communicating with the oil channel of the rotary shaft. And a cover provided to cover the lower surface of the communication plate and having a communication path for communicating the connection hole and the exit hole and a suction port for guiding oil to the inlet hole.

Oil pumping apparatus according to the present invention having such a configuration can be pumped and supplied more smoothly to the oil to perform the cooling and lubrication action, there is an advantage to increase the operation reliability of the compressor.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the oil pumping device of the hermetic compressor according to the present invention will be described in detail.

4 is a cross-sectional view of a preferred embodiment of the oil pumping apparatus of the hermetic compressor according to the present invention, FIG. 5 is a cross-sectional view taken along line AA ′ of FIG. 4, and FIGS. The construction of the cover is shown in plan view.

As shown in these figures, the rotating shaft 50 rotates with the rotor of the motor unit, and an oil passage 52 is formed along the inside thereof. The oil passage 52 is formed on the inside or the surface of the rotary shaft 50 according to the position of the rotary shaft 50.

The lower end of the rotating shaft 50 is inserted into the bushing 54. The bushing 54 may serve to support the lower end of the rotary shaft 50 according to the type of compressor. The bushing 54 is connected to and fixed to one side of the sealed container. A pumping chamber 56 is formed in the bushing 54. The pumping chamber 56 is a cylindrical space formed inside the bushing 54. Pumping of oil is performed in the pumping chamber 56.

An eccentric pin 58 is provided in the pumping chamber 56. The eccentric pin 58 extends from the lower end of the rotation shaft 50 and is provided at an eccentric position in the rotation center of the rotation shaft 50. Accordingly, the eccentric pin 58 draws a predetermined circular trajectory within the pumping chamber 56 by the rotation of the rotation shaft 50.

A pumping roller 60 is installed at the eccentric pin 58. The pumping roller 60 has a diameter smaller than the diameter of the pumping chamber 56 and has a shape substantially the same height. The pumping roller 60 serves to pump oil while rotating in contact with the inner surface of the pumping chamber 56.

A vane slot 62 is formed to penetrate up and down one inner wall of the pumping chamber 56. The vane slot 62 is provided with vanes 64. The vanes 64 are supported by vanes springs 66 to protrude from the vaneslot 62 into the pumping chamber 56. Accordingly, the vane 64 has its tip always in contact with the surface of the pumping roller 60 so as to divide the internal space of the pumping chamber 56 into two areas.

Inflow holes 68 and discharge holes 69 are formed at positions adjacent to the vane slot 62, respectively, to communicate the pumping chamber 56 with the outside. The inlet hole 68 is a path through which oil is delivered to the inside of the pumping chamber 56, and the outlet hole 69 is a path through which oil escapes from the pumping chamber 56.

Now, a means for forming a path through which oil flows in and out of the pumping chamber 56 will be described.

First, the communication plate 70 forms the bottom surface of the pumping chamber 56, and a plurality of holes are drilled. That is, the inlet hole 72 is drilled in the communication plate 70. The inlet hole 72 is in communication with the inlet hole 68. The inlet hole 72 serves to deliver the oil delivered from the suction port 80 to be described below through the inlet hole 68 into the pumping chamber 56. The communication plate 70 is fixed to the bushing 54 and installed.

A connection hole 74 is drilled in the communication plate 70. The connection hole 74 is a path through which oil is discharged from the pumping chamber 56. The connection hole 74 is in communication with the communication path 82 of the cover 78 to be described below.

An outlet hole 76 is drilled in the communication plate 70. The outlet hole 76 communicates the oil passage 52 and the communication passage 82 to transfer oil from the pumping chamber 56 to the oil passage 52 through the connection hole 74.

A cover 78 is installed on the bottom surface of the communication plate 70, and the cover 78 serves to form a path through which oil flows while shielding the bottom surface of the communication plate 70. The cover 78 is fixed to the communication plate 70 or the bushing 54. Inlet cover 80 is formed in the cover 78. The suction port 80 is a path for delivering the oil stored in the oil storage unit to the pumping chamber 56 through the inlet hole 72.

The cover 78 is also provided with a communication path 82 for communicating the connection hole 74 and the exit hole 76. The oil from the connecting hole 74 is transferred to the outlet hole 76 through the communication path 82 so as to flow into the oil channel 52.

Hereinafter, the operation of the oil pumping device of the hermetic compressor according to the present invention having the configuration as described above will be described in detail.

When the operation signal is applied to the compressor, the rotating shaft 50 is rotated by the motor unit. When the rotation shaft 50 is rotated, the eccentric pin 58 draws a circular trajectory inside the pumping chamber 56. Thus, the pumping roller 60 is to pump the oil while rotating in the pumping chamber 56. Of course, a certain amount of oil is supplied to the pumping chamber 56 before the rotation of the rotary shaft 50. This is because the lower end of the rotating shaft 50 is sufficiently submerged in oil.

That is, as shown in Figure 8, initially the space communicating with the inlet hole 68 is formed relatively narrow, the opposite space is formed relatively wide. When the pumping roller 60 continues to rotate in such a state, a portion in contact with the inner surface of the pumping chamber 56 is relatively far from the vane 64, and a space communicating with the inflow hole 68 is provided. Gradually widening. In this process, while the pressure in this space is relatively low, oil is sucked into the pumping chamber 56 through the suction port 80, the inlet hole 72 and the inlet hole 68.

9 and 10 illustrate a process in which oil is continuously sucked into the pumping chamber 56. In this process, the pumping chamber 56 continues to be divided into two areas. In the area communicating with the discharge hole 69, the oil previously sucked into the area is discharged. Is discharged through.

On the other hand, the rotation of the pumping roller 60 is to repeat the same process, the state of Figure 8 is a case where the volume of the space communicating with the discharge hole 69 is relatively large, the new oil is sucked into the opposite space It is starting to become.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

For reference, the present invention can be applied to various compressors. That is, the present invention can be applied to scroll compressors, rotary compressors and reciprocating compressors. For example, when applied to a scroll compressor, the bushing 54 also serves to support the lower end of the rotary shaft 50, and when applied to a reciprocating compressor, the bushing 54 supports the pumping chamber 56 rather than supporting the crankshaft. To form.

Meanwhile, in the illustrated embodiment, the communication plate 70 and the cover 78 are used to form a path of oil entering and exiting the pumping chamber 56. However, it is not necessary to do so, and the path of the oil may be formed in various ways. Oil may be introduced into and out of the pumping chamber 56.

In the oil pumping apparatus of the hermetic compressor according to the present invention as described in detail above, the following effects can be expected.

In the present invention, in the pumping roller divides the internal space of the pumping chamber into two regions, the vanes supported by the vanes spring are in close contact with the surface of the pumping roller to partition one side of the region, and the other side of the region is the surface of the pumping roller. Directly contacting the inner surface of the pumping chamber to partition. Therefore, in the present invention, the space communicating with the inflow hole and the discharge hole within the pumping chamber can be more reliably partitioned, so that the pumping of the oil can be more reliably performed. Supply can improve the operation reliability of the compressor.

Claims (3)

A bushing having a pumping chamber in which oil pumping is performed, A pumping roller provided at a position eccentric with respect to the center of rotation of the rotating shaft rotated by the motor unit to draw a predetermined circular trajectory such that at least one side contacts the inner surface of the pumping chamber; A vane which is supported by the elastic member to protrude into the pumping chamber and whose tip is in contact with the pumping roller to define an internal space of the pumping chamber; And an oil path forming means for forming a path through which oil flows into the pumping chamber and a path through which oil from the pumping chamber is transferred to an oil flow path of the rotating shaft. According to claim 1, wherein the vanes are seated so as to be able to enter and exit in the vane slot is formed long and vertically along the inner wall of the pumping chamber, the inflow through which the oil flows into and out of the pumping chamber respectively in the portions corresponding to both ends of the vane slot. Oil pumping device of the hermetic compressor, characterized in that the hole and the discharge hole is drilled. The oil path forming means according to claim 1 or 2, A communication plate forming a lower surface of the pumping chamber and communicating with an inlet hole of the pumping chamber, a connecting hole communicating with the discharge hole of the pumping chamber, and an outlet hole communicating with an oil passage of the rotary shaft; The oil pumping device of the hermetic compressor, characterized in that it comprises a cover installed to cover the lower surface of the communication plate and having a communication path for communicating the connection hole and the outlet hole and a suction port for guiding oil to the inlet hole.

Images