JP2009133233A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable scroll compressor capable of inhibiting refrigerant dissolving in lubricating oil from foaming while preventing uneven distribution of a lubrication oil and a liquid refrigerant. <P>SOLUTION: This scroll compressor 100 is provided with a compression mechanism part 30, a motor part 40, a hermetic vessel 1 storing the compression mechanism part 30 and the motor part 40, a rotary shaft 7 transmitting drive force of the motor part 40 to the compression mechanism part 30, and a lubricating oil 15 stored at a bottom part of the hermetic vessel 1. An oil agitating means 12 agitating the lubricating oil 15 stored at the bottom part of the hermetic vessel 1 is provided at a lower end part of the rotary shaft 7. An oil heating means 13 transmitting heat generated in the hermetic vessel 1 to the lubricating oil 15 and heating the lubricating oil is also provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and is particularly suitable for a scroll compressor that supplies lubricating oil stored in a bottom portion of a sealed container to a sliding portion.

  An example of a conventional scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 2006-342673 (Patent Document 1).

  The scroll compressor of this patent document 1 arrange | positions the compression mechanism part which meshed the fixed scroll and the turning scroll, and formed the compression chamber, the electric motor part which drives a compression mechanism part, and a compression mechanism part and an electric motor part up and down. The sealed container, the rotating shaft that transmits the driving force of the electric motor section to the compression mechanism section, and the lubricating oil stored in the bottom of the sealed container and supplied to the sliding section through the rotating shaft. Yes.

  In order to reduce the cost of the scroll compressor, the diameter of the compressor is reduced to reduce the cost of the electric motor. Here, in the configuration of the refrigeration cycle, when it is necessary to enclose a large amount of refrigerant, measures are taken to increase the length of the sealed container and enclose more lubricant oil in order to ensure lubricity.

  Further, as a conventional oil lubrication and noise reduction device for a refrigerant compressor, there is one disclosed in Japanese Patent Laid-Open No. 63-12893 (Patent Document 2).

  The oil lubrication and noise reduction device of Patent Document 2 includes an oil reservoir, a crankshaft, an oil pickup tube that extends into the oil reservoir and is rotatable with the crankshaft, and an impeller that generates bubbles in the oil. And a baffle device mounted on the bottom wall of the oil reservoir and defining a passage for oil flow.

JP 2006-342673 A JP-A 63-12893

  In the scroll compressor of Patent Document 1 described above, lubricating oil and liquid refrigerant may be unevenly distributed during operation of the refrigeration cycle. This is caused by so-called two-layer separation in which the density differs depending on the physical properties of the refrigerant and the lubricating oil, such as temperature, pressure, solubility, and the return of the liquid refrigerant from the refrigeration cycle. Due to this non-uniform distribution, the state of the lubricating oil supplied to the compressor sliding portion becomes unstable, which may lead to a decrease in the reliability of the compressor.

  Further, since the refrigerant compressor of Patent Document 2 includes an impeller that generates bubbles in the oil, the uneven distribution of the lubricating oil and the liquid refrigerant can be improved, but the bubbles generated in the oil The required lubrication performance on the sliding surface could not be obtained, leading to a decrease in reliability.

  An object of the present invention is to provide a highly reliable scroll compressor capable of suppressing foaming of refrigerant dissolved in lubricating oil while preventing uneven distribution of lubricating oil and liquid refrigerant.

  In order to achieve the above-described object, a scroll compressor according to the present invention includes a compression mechanism unit that forms a compression chamber by meshing a fixed scroll and a turning scroll, an electric motor unit that drives the compression mechanism unit, and the compression unit. A sealed container in which a mechanism part and the electric motor part are arranged vertically and housed, a rotating shaft that transmits the driving force of the electric motor part to the compression mechanism part, and stored in the bottom of the sealed container and slid through the rotating shaft Lubricating oil supplied to the part, oil agitation means for agitating the lubricating oil attached to the lower end of the rotating shaft and stored at the bottom of the hermetic container, and heat generated in the hermetic container And an oil heating means that heats the lubricating oil transmitted to the lubricating oil stored in the bottom of the oil.

A more preferable specific configuration example of the present invention is as follows.
(1) The oil heating means is immersed in a metal heat receiving part disposed in a discharge space in the sealed container from which compressed refrigerant is discharged, and in a lubricating oil stored in a bottom part of the sealed container. And a metal heat dissipating part that heats the lubricating oil with the heat transmitted from the heat receiving part, and a metal support part fixedly supported by the sealed container.
(2) In said (1), the said thermal radiation part is provided so that the three-dimensional flow of the lubricating oil by the said oil stirring means may be accelerated | stimulated.
(3) In the above (1), the oil heating means is constituted by an integral assembly in which the heat receiving portion and the heat radiating portion are fixed to the support portion, and is installed in the sealed container.
(4) In the above (3), a main bearing that supports the compression mechanism portion side of the rotating shaft, a frame that supports the main bearing, and a secondary bearing that supports the anti-compression mechanism portion side of the rotating shaft are provided. The support portion also serves as a member that supports the auxiliary bearing.
(5) In (1), the heat receiving part is provided so as to guide the flow of the refrigerant in the lower space below the electric motor part.
(6) In said (1), the said rotating shaft is comprised from the shaft member and the oil supply piece attached to the lower end part of this shaft member, and the said thermal radiation part is formed integrally with the said oil supply piece.
(7) The oil agitating means is provided so that the agitating ability decreases with an increase in the rotational speed of the electric motor section.

  ADVANTAGE OF THE INVENTION According to this invention, the highly reliable scroll compressor which can suppress foaming of the refrigerant | coolant melt | dissolved in lubricating oil can be provided, preventing the uneven distribution of lubricating oil and a liquid refrigerant.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent.

(First embodiment)
A scroll compressor according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a scroll compressor as a scroll fluid machine according to a first embodiment of the present invention.

  First, the entire scroll compressor 100 will be described.

  The scroll compressor 100 is configured by vertically storing the compression mechanism unit 30 and the electric motor unit 40 in the sealed container 1.

  The compression mechanism unit 30 has the fixed scroll 2, the orbiting scroll 3, and the frame 4 as basic elements. The fixed scroll 2 and the orbiting scroll 3 are provided so as to mesh with each other to form a compression chamber.

  The fixed scroll 2 is formed in an end plate 2a, a spiral wrap 2b erected on the end plate 2a, a suction port 2c formed in an outer peripheral portion of the end plate 2a, and a central portion of the end plate 2a. 2d. A suction pipe 16 is connected to the suction port 2c. The discharge port 2d is opened in an upper space that forms a part of the discharge space 17 in the sealed container 1. A discharge pipe 18 that guides the refrigerant from the discharge space 17 to the outside of the compressor is provided through the sealed container 1.

  The orbiting scroll 3 is provided in the end plate 3a, a spiral wrap 3b standing on the end plate 3a, a boss cylinder 3c standing on the back side of the end plate 3a, and the boss cylinder 3c. And a slewing bearing 3d.

  The frame 4 is fixed to the sealed container 1 by welding or the like. The fixed scroll 2 is fixed to the frame 4 with bolts or the like. The orbiting scroll 3 is disposed between the fixed scroll 2 and the frame 4 so as to be orbitable. The frame 4 forms a back pressure chamber that is an intermediate pressure between the discharge pressure and the suction pressure during operation on the back side of the end plate 3a. The orbiting scroll 3 is pressed against the fixed scroll 2 by the intermediate pressure of the back pressure chamber during operation, and the sealing performance of the compression chamber is enhanced.

  The drive mechanism for driving the orbiting scroll 3 to orbit the motor unit 40, the rotating shaft 7, the Oldham ring 8 that is a main part of the rotation preventing mechanism of the orbiting scroll 3, and the upper portion of the rotating shaft 7 are rotatably engaged. Basically, a swivel bearing 3a that engages the main bearing 9 and the eccentric portion of the rotating shaft 7 so as to be movable in the direction of the rotating shaft and rotatably, and a sub-bearing 11 that engages the lower portion of the rotating shaft 7 rotatably. As an element.

  The electric motor unit 40 includes an annular stator 5 and an annular rotor 6. The stator 5 is fixed to the sealed container 1 by shrink fitting or the like. The rotor 6 is rotatably disposed in the stator 5.

  The electric motor unit 40 and the compression unit 30 are arranged in the vertical direction, which is the longitudinal direction of the sealed container 1, and are linked by the rotation shaft 7. The frame 4 is disposed between the electric motor unit 40 and the compression unit 30.

  The rotating shaft 7 is comprised from the shaft member 7a and the oil supply piece 7b attached to the lower end part of this shaft member 7a. The shaft member 7 a is provided through the rotor 6 of the electric motor unit 40, and the oil supply piece 7 b is provided soaked in the lubricating oil 15. The upper part of the shaft member 7a is rotatably supported by the main bearing 9, the intermediate part of the shaft member 7a passes through the center of the rotor 6, and the lower part of the shaft member 7a is rotatably supported by the sub bearing 11. ing. The auxiliary bearing 11 is provided to ensure stable rotation of the rotating shaft 7. The main bearing 9 is supported at the center of the frame 4, and the auxiliary bearing 11 is supported at the center of the support portion 13c.

  The Oldham ring 8 is installed in the frame 4. One set of two orthogonal key portions formed on the Oldham ring 8 slides on the key groove formed on the frame 4, and the other set slides on the key groove formed on the back side of the orbiting scroll end plate.

  The suction port of the oil supply piece 7 b is immersed in the lubricating oil 15 stored at the bottom of the sealed container 1. The discharge port of the oil supply piece 7b communicates with the lower end opening of the oil supply passage 13 of the shaft member 7a.

  Next, the basic operation of the scroll compressor 100 will be described.

  The rotating force of the rotor 6 is given by the rotating magnetic field generated by the stator 5, and the rotating shaft 7 fixed to the rotor 6 rotates as the rotor 6 rotates. The orbiting scroll 3 is movably engaged with the eccentric portion of the rotating shaft 7 so as to be movable in the direction of the rotating shaft, and the rotating motion of the rotating shaft 7 is caused by the rotation preventing mechanism such as the Oldham ring 8 to rotate. Converted to. The volume of the compression chamber formed by meshing the fixed scroll 2 and the orbiting scroll 3 decreases as the orbiting scroll 3 orbits.

  In this compression operation, with the orbiting motion of the orbiting scroll 3, refrigerant such as refrigerant is sucked into the compression chamber via the suction pipe 16 and the suction port 2a. The sucked refrigerant communicates with the discharge port 2b of the fixed scroll through the compression stroke in the compression chamber, passes through the discharge space 17, and is finally discharged from the discharge pipe 18 to the outside of the compressor.

  The refrigerant flow in the discharge space 17 will be specifically described.

  The discharge space 17 includes an upper space 17 a above the compression mechanism portion 30, a central space 17 b between the compression mechanism portion 30 and the electric motor portion 40, and a lower space 17 c below the electric motor portion 40. The upper space 17a and the central space 17b are communicated with each other via an upper communication passage 17d formed on one side outer peripheral portion of the fixed scroll 2 and the frame 4. The central space 17 b and the lower space 17 c are communicated with each other through lower communication passages formed at a plurality of locations on the outer peripheral portion of the stator 5 and gaps between the stator 5 and the rotor 6.

  The refrigerant discharged from the discharge port 2b into the upper space 17a flows into the central space 17b through the upper communication passage 17d, and most of the refrigerant flows through the central space 17b toward the discharge pipe 18 and flows out to the outside. Flows into the lower space 17c through the lower communication passage and the gap. The refrigerant that has flowed into the lower space 17c flows laterally through the lower space 17c, flows into the discharge pipe 18 side of the central space 17b, and flows out to the outside through a lower communication passage provided on the discharge pipe 18 side. The

  Next, stirring and heating of the lubricating oil 15 in the scroll compressor 100 will be described.

  An oil stirring means 12 for stirring the lubricating oil 15 stored at the bottom of the sealed container 1 is provided at the lower end of the rotating shaft 7. Specifically, the oil agitating means 12 is constituted by an agitating blade attached to the oil supply piece 7b. By rotating the oil agitating means 12 together with the rotation of the rotating shaft 7, the lubricating oil 15 can flow three-dimensionally, and uneven distribution between the lubricating oil 15 and the refrigerant can be prevented.

  Also, below the electric motor unit 40, oil heating means 13 is provided that heats the lubricating oil 15 stored in the bottom of the sealed container 1 by transmitting heat received from the sealed container 1 to heat the lubricating oil 15. Yes. One factor that causes the non-uniform state between the lubricating oil 15 and the refrigerant is temperature. The refrigerant liquefies and the viscosity of the lubricating oil 15 tends to decrease as the temperature decreases. For this reason, by receiving heat from the compression mechanism part 30 in the compressor, the electric motor part 40, the compressed refrigerant | coolant etc. which flow through discharge space, this heat is transmitted to the lubricating oil 15, and the temperature of the said lubricating oil 5 is raised. Thus, the liquefaction of the refrigerant can be suppressed, and an uneven state between the lubricating oil 15 and the refrigerant can be prevented. As a result, when the lubricating oil 15 is stirred by the oil stirring means 12, it becomes possible to gently evaporate the refrigerant and suppress foaming, so that the lubricating oil 15 stored at the bottom of the sealed container 1 can be convected or It is possible to promote the homogenization of the lubricating oil 15 and the refrigerant by circulation. Therefore, high reliability can be realized even in the reduction of the outer diameter, which is advantageous for reducing the size of the compressor for cost reduction. Since the oil heating means 13 uses heat generated during the operation of the compressor without adding a special heat source such as a heater, the oil heating means 13 can promote equalization with an inexpensive and simple configuration.

  The oil heating means 13 is immersed in a metal heat receiving portion 13a disposed in the discharge space 17 in the sealed container 1 from which the compressed refrigerant is discharged, and in the lubricating oil 15 stored in the bottom of the sealed container 1. The metal heat dissipating part 13 b that heats the lubricating oil 15 with the heat transmitted from the heat receiving part 13 a and the metal support part 13 c that is fixedly supported by the sealed container 1 are included. Specifically, the oil heating means 13 is constituted by an integral assembly in which the heat receiving portion 13a and the heat radiating portion 13b are welded and fixed to the support portion 13c from both sides. Since the oil heating means 13 of this monolithic assembly is installed in the sealed container 1, it can be installed in the sealed container 1 with a simple operation.

The heat receiving portion 13 a is provided so as to guide the flow of the refrigerant in the lower space 17 c below the electric motor portion 40. From Specifically, the heat receiving portion 13a includes a cylindrical portion 13a ₁ having an inner diameter larger than the outer diameter of the rotating shaft 7, a disk-shaped flange portion 13a ₂ Metropolitan extending horizontally from the upper end of the cylindrical portion 13a ₁ It is constructed and made by drawing from a steel plate. The flange portion 13a ₂ is disposed close to and opposed to the electric motor portion 40, and extends along the flow direction of the refrigerant. According to the heat receiving portion 13a, the heat flowing from the flowing refrigerant can be favorably exchanged to receive heat from the refrigerant without disturbing the flow of the refrigerant in the lower space 17c, and the radiant heat from the electric motor portion 40 can also be received well. Sufficient heating capacity can be ensured.

  In addition, a heating capability can further be increased by providing unevenness on the surfaces of the heat receiving portion 13a and the heat radiating portion 13b to increase the electric heating area.

The heat dissipating part 13b is provided so as to promote the three-dimensional flow of the lubricating oil 15 by the oil stirring means 12. Specifically, the heat radiating portion 13b includes a cylindrical portion 13b ₁ having an inner diameter larger than the outer diameter of the rotating shaft 7, and a disk-shaped flange portion 13b ₂ extending in the horizontal direction from the lower end portion of the cylindrical portion 13b _1. It is constructed and made by drawing from a steel plate. According to the heat radiating part 14a, the three-dimensional flow of the lubricating oil 15 can be further promoted, and the uneven distribution of the lubricating oil 15 and the refrigerant can be prevented more reliably.

  The support portion 13 c also serves as a member that supports the auxiliary bearing 11. According to the support portion 13c, the oil heating means 13 can be manufactured at a low cost.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional perspective view of an essential part of a scroll compressor according to a second embodiment of the present invention. In FIG. 2, the auxiliary bearing portion is omitted and schematically shown. The second embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, and thus redundant description is omitted.

  In the second embodiment, the oil stirring means 12 is integrally formed with the oil supply piece 7b of the rotating shaft 7. This oil stirring means 12 is comprised by the part which protrudes in plate shape from the side surface of the oil supply piece 7b. When the oil supply piece 7b is manufactured by a mold such as a casting, the oil agitating means 12 can be manufactured at the same time. By combining the heat dissipating part 13b and the protrusion that is the oil stirring means 12, the flow of the lubricating oil 15 can be generated three-dimensionally around the axis, and the oil level can be stabilized. In addition, a more complicated flow can be generated by providing unevenness on the surface of the heat radiating portion 13b.

  Moreover, about the protrusion which is the oil stirring means 12 provided in the rotating shaft 7, you may provide two or more as needed, and may change the position of the height direction of a compressor. In addition, you may make it attach the oil stirring means 12 of separate pieces, such as welding, press-fit, adhesion | attachment, with respect to the rotating shaft 7. FIG.

  In the case of excessive stirring during high-speed rotation, the oil stirring means 12 is loosely mounted and slipped with respect to the rotation of the rotating shaft 7 to reduce the actual rotational speed, and stirring during high-speed operation of the compressor May be suppressed. Alternatively, the wing-shaped oil stirring means 12 may be made of a flexible material (such as a thin metal plate or a resin) to deform the high-speed operation and reduce the stirring ability.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional perspective view of an essential part of a scroll compressor according to a third embodiment of the present invention. In FIG. 3, the auxiliary bearing portion is omitted and schematically shown. The third embodiment is different from the second embodiment in the following points, and the other points are basically the same as those in the second embodiment, and thus redundant description is omitted.

  In this 2nd Embodiment, the oil stirring means 12 is comprised by the part which protrudes in a spiral form from the side surface of the oil supply piece 7b. By combining the oil stirring means 12 and the heat radiating portion 13b, the flow of the lubricating oil 15 can be generated three-dimensionally around the axis, and the oil level can be stabilized. The flow of the lubricating oil 7 can also be controlled by controlling the flow direction of the spiral oil stirring means 12.

It is sectional drawing of the scroll compressor as a scroll fluid machine of 1st Embodiment of this invention. It is a principal part cross-sectional perspective view of the scroll compressor of 2nd Embodiment of this invention. It is a principal part cross-sectional perspective view of the scroll compressor of 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sealed container, 2 ... Fixed scroll, 2a ... End plate, 2b ... Wrap, 2c ... Suction port, 2d ... Discharge port, 3 ... Revolving scroll, 3a ... End plate, 3b ... Wrap, 3c ... Boss cylinder, 3d ... Slewing bearing, 4 ... frame, 5 ... stator, 6 ... rotor, 7 ... rotating shaft, 7a ... shaft member, 7b ... oil supply piece, 8 ... Oldham ring, 9 ... main bearing, 11 ... sub-bearing, 12 ... stirring Means, 13 ... Oil heating means, 13a ... Heat receiving part, 13b ... Heat radiation part, 13c ... Supporting part, 15 ... Lubricating oil, 16 ... Suction pipe, 17 ... Discharge space, 17a ... Upper space, 17b ... Central space, 17c ... Lower space, 18 ... discharge pipe, 30 ... compression mechanism part, 40 ... electric motor part, 100 ... scroll compressor.

Claims (8)

A compression mechanism that forms a compression chamber by meshing the fixed scroll and the orbiting scroll;
An electric motor that drives the compression mechanism;
A sealed container in which the compression mechanism part and the electric motor part are arranged vertically and stored;
A rotating shaft that transmits the driving force of the electric motor unit to the compression mechanism unit;
Lubricating oil stored in the bottom of the sealed container and supplied to the sliding part through the rotating shaft;
An oil stirring means attached to the lower end of the rotating shaft and stirring the lubricating oil stored in the bottom of the sealed container;
A scroll compressor comprising: an oil heating unit configured to transmit heat generated in the sealed container to the lubricant stored in the bottom of the sealed container to heat the lubricant.   2. The oil heating means according to claim 1, wherein the oil heating unit includes a metal heat receiving portion disposed in a discharge space in the sealed container from which the compressed refrigerant is discharged, and lubricating oil stored in a bottom portion of the sealed container. And a metal heat dissipating part that heats the lubricating oil by heat transmitted from the heat receiving part and a metal support part fixedly supported by the sealed container. Compressor.   3. The scroll compressor according to claim 2, wherein the heat radiating portion is provided so as to promote a three-dimensional flow of the lubricating oil by the oil stirring means.   3. The scroll compressor according to claim 2, wherein the oil heating means is configured as an integrated assembly in which the heat receiving portion and the heat radiating portion are fixed to the support portion, and is installed in the sealed container.   In Claim 4, It is provided with the main bearing which supports the compression mechanism part side of the rotating shaft, the frame which supports this main bearing, and the auxiliary bearing which supports the anti-compression mechanism part side of the rotating shaft, A scroll compressor characterized in that the support portion also serves as a member for supporting the auxiliary bearing.   3. The scroll compressor according to claim 2, wherein the heat receiving portion is provided so as to guide a flow of refrigerant in a lower space below the electric motor portion.   3. The scroll compression according to claim 2, wherein the rotating shaft includes a shaft member and an oil supply piece attached to a lower end portion of the shaft member, and the heat radiating portion is formed integrally with the oil supply piece. Machine.   2. The scroll compressor according to claim 1, wherein the oil agitating means is provided such that the agitating ability is reduced as the rotational speed of the electric motor section is increased.

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