KR100745713B1 - Oil Pumping apparatus for hermetic compressor - Google Patents

Abstract

The present invention relates to an oil pumping device using the viscosity of oil. In the present invention, the oil supply piece 40 is formed by pressing the lower end of the crank shaft 30 so that the lower end is expanded, and the suction member 50 having a shape corresponding to the oil supply piece 40 is provided inside the oil supply piece 40. Locate it. The suction member 50 is supported by the support spring 60, the support spring 60 is supported by a fixing 62 installed on the bottom surface of the airtight container 20. Therefore, the suction member 50 is installed in close contact with the inner surface of the oil supply piece 40 by the elastic force of the support spring 60, the relative position between them is always kept constant. In addition, the support spring 60 absorbs the shock applied from the outside so that the installation state of the suction member 50 and the oil supply piece 40 is always kept constant. According to the present invention, there is an advantage that the oil pumping operation is always kept relatively constant and its installation state does not change even when the external shock is easy, and the assembling work is easy.

Compressor, oil pumping, viscosity

Description

Oil pumping apparatus for hermetic compressor

1 is a cross-sectional view showing the configuration of an oil pumping device of a hermetic compressor according to the prior art.

Figure 2 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.

3 is a cross-sectional view taken along line AA ′ of FIG. 2 showing the principal parts of an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: airtight container 3: stator

5: rotor 7: crankshaft

8: oil euro 9: refueling piece

11: Suction member 13: U-shaped bracket

14,14 ': Sidearm 15: Oil

20: airtight container 21: oil

30: crankshaft 32: oil euro

40: oil supply piece 42: through hole

50: suction member 52: spiral flow path                 

54: support space 55: fixed jaw

60: support spring 62: holder

The present invention relates to a hermetic compressor, and more particularly, to an oil pumping device of a hermetic compressor for supplying oil to a heat generating part or a sliding part of the hermetic compressor to perform heat dissipation and lubrication.

In the hermetic compressor, the oil for heat dissipation or lubrication must be circulated in the heat generating part or the sliding part. The oil pumping apparatus is largely divided into using centrifugal force by rotation of the crankshaft and using viscous force of oil.

Figure 1 is a cross-sectional view of the configuration of the oil pump according to the prior art using the viscous force of the oil. According to this, a sealed space is formed inside the sealed container 1. The sealed container 1 is generally composed of an upper container and a lower container to form a sealed space therein.

The inside of the hermetic container 1 is provided so that the compression mechanism for greatly compressing the working fluid and the motor portion for providing a driving force for driving the compression mechanism is supported on the frame (not shown). The frame is supported and installed inside the hermetic container 1. The compression mechanism is configured to linearly reciprocate the piston in the compression chamber by the driving force of the motor unit, and compression is performed while the working fluid flows in and out of the compression chamber through the valve assembly.

Looking at the configuration of the motor unit, the stator (3) is installed inside the sealed container (1), the rotor (5) which is rotated in electromagnetic interaction with the stator (3) rotatably supported on the frame do. At the bottom of the stator 3, a shroud 4 for supporting the U-shaped bracket 13 to be described below is installed.

 The crankshaft 7 is installed through the center of the rotor 5. The crankshaft 7 is connected to the piston of the compression mechanism portion at its upper end to transmit power generated in the motor portion. The rotational force of the crankshaft 7 is converted into a linear reciprocating motion of the piston and transmitted.

On the other hand, the oil (15) that discharges heat from the heat generating portion in the compressor and lubricating in the sliding portion is stored in the lower portion of the sealed container (1), the oil (15) to the heat generating portion and the sliding portion An oil passage 8 is formed penetrating the inside of the crankshaft 7 for delivery. The oil passage 8 is formed up to the top of the crankshaft 7 to transfer the oil 15 to the inner upper portion of the sealed container 1.

In addition, a configuration for delivering the oil 15 to the oil passage 8 inside the crank shaft 7 is provided at the lower end of the crank shaft 7. That is, the oil supply piece 9 is provided at the lower end of the crankshaft (7). The oil supply piece 9 is formed in a cylindrical shape, and the inside thereof penetrates up and down. The oil supply piece 9 has an upper end pressed into the lower end of the crankshaft 7, and the lower end thereof is locked in the oil 15.                         

In addition, a suction member 11 is installed inside the oil feed piece 9. The suction member 11 has a spiral groove formed along the outer circumferential surface thereof to guide the oil 15. This suction member 11 is relatively stopped in the oil supply piece 9 which is supported by the U-shaped bracket 13 in the oil supply piece 9 and rotates integrally with the crankshaft 7.

The U-shaped bracket 13 has a predetermined elasticity, and is connected to the suction member 11 at a central portion thereof to support the suction member 11, and extends in a U shape at both ends 14 and 14. Is supported on the shroud 4.

Hereinafter, the pumping apparatus of the hermetic compressor according to the related art having the configuration as described above will be described.

When the compressor is driven, a working fluid to be compressed is supplied to the compression mechanism. The motor unit is driven to compress the working fluid in the compression chamber. That is, the rotor 5 is rotated by the electromagnetic interaction between the stator 3 and the rotor 5, and the crankshaft 7 press-fitted to the rotor 5 is rotated. Compression is achieved by transmitting power to the compression mechanism.

On the other hand, it will be described that the oil 15 is sucked up by the rotation of the crankshaft 7 as described above. That is, the oil supply piece 9 whose lower end is immersed in the oil 15 is rotated together with the crankshaft 7. At this time, the suction member 11 is relatively stationary inside the oil supply piece (9). This is because the suction member 11 is supported by the U-shaped bracket 13 fixed to the stator 3.                         

Accordingly, the suction member 11 is fixed and the oil 15 is sucked along the spiral groove formed on the outer surface of the suction member 11 by the viscous force of the oil 15 while the oil supply piece 9 is rotated. And is delivered to the oil passage (8). In this way, the oil 15 delivered to the oil passage 8 is sucked into the upper portion of the crankshaft 7 and transferred to each sliding part and the heat generating part to perform lubrication and heat dissipation.
Reference numeral 16 is a mounting plate for fixing the sealed container to the machine room of the refrigerator.

However, the prior art as described above has the following problems.

That is, in the case of using the U-shaped bracket 13 having an elastic force, the gap between the suction member 11 and the inner surface of the oil feed piece 9 installed in the oil feed piece 9 is not set accurately, and thus the initial sphere At the same time, there is a problem that the suction of the oil 15 is not smoothly made. This is because side arms 14 and 14 'provided at both ends of the U-shaped bracket 13 are formed relatively long.

In addition, the suction member 11 must be fixed so as to be relatively stationary with respect to the oil supply piece 9, and thus the suction member 11 and the oil supply piece 9 cannot be configured as one assembly. That is, the oil feed piece 9 is first press-fitted to the lower end of the crankshaft 7, and the suction member 11 connected to the U-shaped bracket 13 is inserted into the oil feed piece 9. Since the U-shaped bracket 13 must be fixed to the shroud 4, there is a problem in that the assembling work is inconvenient.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, to provide a smoother supply of oil for heat dissipation and lubrication when the compressor is driven.

Another object of the present invention is to improve the assembly workability of the oil pumping device.

According to a feature of the present invention for achieving the object as described above, the present invention is formed in the lower end portion is extended to a predetermined section and installed on the lower end of the crankshaft rotated integrally with the crankshaft and stored in the bottom surface of the sealed container through the inside The suction member is formed so that the lower end portion is extended in a predetermined section so as to have a predetermined gap between the oil supply piece for sucking the oil and the inner surface of the oil supply piece, and is installed to be relatively stopped with respect to the oil supply piece inside the oil supply piece. And a support part installed on the bottom surface of the airtight container and allowing the suction member to be positioned inside the oil supply piece with elastic force.
The suction member is characterized in that the spiral flow path for guiding the suction of the oil around the outer peripheral surface is formed.
The support part may include a fixing stand fixed to the bottom surface of the airtight container, and a support spring supported on the fixing stand and inserted into the suction member to support the suction member in a direction in close contact with the inner surface of the oil supply piece with elastic force. Characterized in that configured to include.
A support space in which the upper end of the support spring is located is formed from the bottom to the upper portion of the suction member, and a fixing jaw is formed at the upper end of the support space to prevent rotation of the suction member. Characterized in that it is provided.

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According to the oil pumping apparatus of the hermetic compressor according to the present invention having such a configuration, there is an advantage in that oil is smoothly supplied for lubrication and heat dissipation, and the workability of the oil pumping apparatus is very high.

Hereinafter, a preferred embodiment of an oil pumping apparatus of a hermetic compressor according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

As shown in Figures 2 and 3, the sealed container 20 constitutes the appearance of the compressor. The airtight container 20 is generally composed of an upper container and a lower container, and various components constituting the compressor are provided therein. That is, various parts are provided that form a motor unit that provides power for driving a compressor and a compressor mechanism unit that compresses a working fluid by the power of the motor unit.

The crank shaft 30 is provided integrally with the rotor of the motor unit and rotates to transmit power to the compression mechanism unit. An oil flow path 32 is formed inside the crank shaft 30. The oil passage 32 sucks up the oil 21 provided in the lower portion of the hermetic container 20 to the upper portion to allow heat dissipation and lubrication of the compression mechanism portion and the motor portion.

A configuration for pumping oil 21 into the oil passage 32 will now be described. An oil supply piece 40 is press-fitted to the lower end of the crankshaft 30. The through hole 42 is formed to penetrate the inside of the oil supply piece 40 up and down. Such a refueling piece 40 has a shape in which a predetermined section gradually extends downward from the upper end to the lower end. In addition, the upper end of the oil supply piece 40 is provided with a straight section having the same internal diameter of a predetermined section.

The suction member 50 is positioned inside the oil supply piece 40. The outer circumferential surface of the suction member 50 is provided to have a predetermined distance from the inner circumferential surface of the oil supply piece 40. Therefore, the suction member 50 also has a shape in which a predetermined section of the lower end is gradually expanded toward the lower portion corresponding to the oil supply piece 40.

Such a suction member 50 is formed with a spiral flow path 52 which is a path through which the oil 21 is guided along its outer circumferential surface. The spiral flow path 52 is formed spirally along the outer circumferential surface. In addition, a support space 54 in which the support spring 60, which will be described below, is positioned inside the suction member 50 extends upwardly through the lower portion. A fixing jaw 55 is formed at an inner upper portion of the support space 54 to prevent the suction member 50 from rotating with respect to the support spring 60. In addition, the upper end of the support space 54 is provided with a straight section having the same inner diameter of a predetermined section.

The suction member 50 is supported by the support spring 60 inserted into the support space 54, the lower portion of the support spring 60 is fixed to the bottom surface of the airtight container 20 62 is supported. The upper end of the support spring 60 is inserted and supported in a straight section of the support space 54. The support spring 60 may apply a predetermined elastic force to the suction member 50 to maintain the predetermined clearance while the suction member 50 is in close contact with the inner surface of the oil supply piece 40 to some extent. The support spring 60 may apply a predetermined elastic force to the suction member 50 to maintain the predetermined gap while the suction member 50 is in close contact with the inner surface of the oil supply piece 40 to some extent. In other words, the support spring 60 supports the suction member 50 in a direction in which the suction member 50 is in close contact with the inner surface of the oil supply piece 40. In this case, a spiral flow path 52 is formed on the outer surface of the suction member 50. Therefore, a gap is generated between the suction member 50 and the inner surface of the oil supply piece 40 at the portion where the spiral flow passage 52 is formed.

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

First, the oil pumping apparatus of the present invention will be described. The oil supply piece 40 is pressed into the crankshaft 30 is installed. The support spring 60 is supported by the lower end of the support 62.                     

In addition, the suction member 50 is installed on the support spring 60 so that the support spring 60 is fitted into the support space 54. At this time, when the suction member 50 is rotated by a predetermined angle in the state fitted to the support spring 60, the front end of the support spring 60 is caught on the fixing jaw (55) and rotates with respect to the support spring (60) Will not be.

When the suction member 50 is inserted into the through hole 42 of the oil feed piece 40 press-fitted into the crankshaft 30, the assembly of the oil pumping device is completed. Of course, the suction member 50 may be assembled to the support spring 60 while being inserted into the oil supply piece 40. At this time, the lower portion of the oil supply piece 40 and the suction member 50 is configured to gradually expand, inserting the suction member 50 into the oil supply piece 40, and the inside of the suction member 50 The process of inserting the support spring 60 into the support space 54 becomes very easy.

It will be described that the operation of the oil pumping device of the present invention assembled as described above. When the compressor is driven, the crank shaft 30 is rotated by the rotation of the motor unit to compress the working fluid in the compression mechanism unit, and the oil 21 is sucked upward through the oil channel 32 of the crank shaft 30. do.

That is, the lubrication piece 40 is integrally rotated with the crankshaft 30, and the wicking member 50 is installed in the state of being stopped in the through hole 42 of the lubrication piece 40. The oil 21 is sucked up along the spiral flow path 52 of the member 50.

At this time, the lower end portions of the suction member 50 and the oil supply piece 40 are configured to be enlarged, and thus the suction force of the oil rising along the spiral flow path 52 of the suction member 50 becomes relatively large.

In this way, the oil 21 drawn along the spiral flow path 52 exits the oil supply piece 40 and continues to rise along the oil flow path 32 of the crankshaft 30 and is transferred to the heating part or the sliding part. It becomes heat dissipation and lubrication.

On the other hand, the suction member 50 installed in the through hole 42 of the oil supply piece 40 is supported by the elastic force of the support spring 60 so that the gap between the oil supply piece 40 and the inner surface is always kept constant. do. Therefore, in particular, the oil supply of the initial driving is made more accurate. In addition, even if the compressor body flows, the support spring 60 absorbs the shock transmitted while being elastically deformed so that the installation state of the oil supply piece 40 installed on the crankshaft 30 is not changed.

In the oil pumping apparatus according to the present invention as described in detail above, the suction member is supported by the elastic force of the support spring in the oil feeding piece, so that the assembled state between the oil feeding piece and the suction member can be always maintained accurately and the operation reliability is improved. do.

In addition, the oil supply piece and the suction member and the support spring are configured to be fitted together, and in particular, since the lower end portions of the oil supply piece and the suction member are formed to be expanded, the workability of the assembly work is greatly improved.

Claims (4)

A lower end portion is formed to extend a predetermined section and is installed at the lower end of the crankshaft to rotate integrally with the crankshaft and suck oil stored in the bottom surface of the sealed container through the inside; A suction member which is formed such that a lower end portion is extended in a predetermined section so as to have a predetermined gap between the inner surface of the oil supply piece and is installed to be stopped relatively to the oil supply piece in the oil supply piece; The oil pumping device of the hermetic compressor, which is installed on the bottom surface of the hermetically sealed container and includes a support for placing the suction member inside the oil supply piece with elastic force. 2. The oil pumping apparatus of the hermetic compressor according to claim 1, wherein the suction member is formed with a spiral flow passage guiding suction of oil around its outer peripheral surface. The method according to claim 1 or 2, wherein the support portion, Fixture fixed to the bottom surface of the sealed container, And a support spring which is supported on the holder and inserted into the suction member to support the suction member in a direction in close contact with the inner surface of the oil feed piece with elastic force. According to claim 3, wherein the inside of the suction member is formed a support space in which the upper end of the support spring is located from the bottom to the top, and the upper end of the support spring to the upper end of the inside of the support space to rotate the suction member Oil pumping device of the hermetic compressor, characterized in that the fixing jaw is provided to prevent.

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