JP2006342722A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which can prevent refrigerant gas whirling in an oil separation chamber from affecting the oil surface of lubricating oil stored in an oil reserver and flowing lubricating oil stored in the oil reserver out from a discharge port into a refrigerant cycle together with the refrigerant oil. <P>SOLUTION: The compressor 10 is provided with a housing 11 having a space m inside, a compression mechanism 12 arranged in the housing 11 to compress fluid surrounded in the space m, a rotary shaft 13 to drive the compression mechanism 12, and the oil separation chamber 17 arranged in the housing 11 to separate lubricating oil LO mixed into fluid discharged from the compression mechanism 12 from the fluid with a centrifugal separation action. An internal surface 17a of the oil separation chamber 17 extends to be almost parallel to the longitudinal axis line of the oil separation chamber 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor applied to an air conditioner or the like.

As a compressor applied to an air conditioner or the like, a compressor in which an oil separation chamber for separating lubricating oil mixed in a fluid discharged from a compression mechanism from a fluid is formed in a rear housing is known. (For example, refer to Patent Document 1).
JP2003-336588A (FIG. 1)

The compressor disclosed in Patent Document 1 is provided with a separation chamber (oil separation chamber) that gradually decreases in diameter from above to below, and the downward speed of the refrigerant gas that rotates in the circumferential direction in the separation chamber Ingredients do not decrease or increase.
Therefore, the lubricating oil that is separated from the refrigerant gas and flows downward through the inner wall surface of the separation chamber advances from the oil storage chamber (oil sump chamber) side toward the gas discharge hole (discharge port) side. It may be wound up by (refrigerant gas after the lubricating oil is separated).
In addition, the refrigerant gas that has flowed into the oil storage chamber through the separation chamber affects the oil surface of the lubricating oil stored in the oil storage chamber, thereby roughing the oil surface (waving), and the lubricating oil stored in the oil storage chamber. A part of the refrigerant flows out of the gas discharge hole into the refrigeration cycle together with the refrigerant gas.

  The present invention has been made in view of the above circumstances, and can prevent the influence of the refrigerant gas swirling in the oil separation chamber from reaching the oil surface of the lubricating oil stored in the oil storage chamber. It is an object of the present invention to provide a compressor capable of preventing the lubricating oil stored in the reservoir chamber from flowing out from the discharge port into the refrigeration cycle together with the refrigerant gas.

The present invention employs the following means in order to solve the above problems.
A compressor according to the present invention includes a housing having a space therein, a compression mechanism that is disposed in the housing and compresses a fluid taken into the space, a rotary shaft that drives the compression mechanism, and an interior of the housing. And an oil separation chamber that separates the lubricating oil mixed in the fluid discharged from the compression mechanism from the fluid by centrifugal separation, and the inner wall surface of the oil separation chamber is It extends so that it may become substantially parallel to the longitudinal axis of an oil separation chamber.
That is, the inner wall surface of the oil separation chamber is formed along the longitudinal axis of the oil separation chamber, and the inner wall surface is substantially parallel to the longitudinal axis. In other words, the angle formed by the longitudinal axis L shown in FIG. 2 and the line depicting one of the inner wall surfaces 17a in FIG. 2 is, for example, +1.5 degrees.
Here, “+” refers to a state in which the inner wall surface 17a is gradually narrowed from the upper side to the lower side in FIG. 2, that is, a state of tapering downward in FIG.
According to such a compressor, the downward velocity component of the swirling flow that moves downward while swirling along the inner wall surface of the oil separation chamber is gradually reduced as it goes downward.
As a result, the influence of the swirling flow can be prevented from reaching the oil level of the lubricating oil stored in the oil storage chamber, and the oil level of the lubricating oil can be kept stable. The stored lubricating oil can be prevented from flowing into the refrigeration cycle from the discharge port together with the refrigerant gas, and the separation efficiency can be improved and the lubricating oil can be reliably supplied to each sliding portion. Therefore, the life of the compressor can be extended and the reliability can be improved.

In the compressor, the bottom of the oil separation chamber may be closed by a bottom plate, and the bottom plate may be provided with a through hole penetrating in the plate thickness direction.
According to such a compressor, the oil separation chamber and the oil sump chamber are in a state of being partitioned by the bottom plate, so that the swirling flow that moves downward while swirling along the inner wall surface of the oil separation chamber. The downward speed component is further reduced.

Furthermore, in the compressor, the inner diameter of the through hole may be set to ¼ or less of the inner diameter of the oil separation chamber.
According to such a compressor, as shown in FIG. 4, by setting the inner diameter φd of the through hole in this way, the oil of the lubricating oil stored in the oil sump chamber can be set regardless of the rotational speed of the compressor. The surface height is kept substantially constant.
As a result, the lubricating oil LO can be reliably supplied to each sliding portion, the life of the compressor can be extended, and the reliability can be improved. Since the oil separation chamber and the oil sump chamber are partitioned by the bottom plate, the downward velocity component of the swirling flow that moves downward while swirling along the inner wall surface of the oil separation chamber is further reduced. It becomes.

Furthermore, in the compressor, a mortar-shaped inclined surface whose diameter is reduced toward the through hole can be formed on the surface of the bottom plate on the oil separation chamber side.
According to such a compressor, the lubricating oil separated in the oil separation chamber is immediately returned to the oil reservoir chamber, and the reduction in the oil level of the lubricating oil stored in the oil reservoir chamber is reduced by the compression. It will be suppressed during machine operation.

  According to the compressor of the present invention, it is possible to improve the moldability of the housing, thereby improving the yield and shortening the length in the axial direction.

  Hereinafter, a first embodiment of a compressor according to the present invention (hereinafter referred to as a “scroll compressor”) will be described with reference to the drawings, but the present invention is of course not limited thereto. FIG. 1 is a view showing the scroll compressor 10 of the present embodiment, and is a cross-sectional structural view when seen in a cross section including the axis of the rotation axis. The discharge port 15a, the oil separation chamber 17, It is the figure which cut the discharge chamber 35 in the part which is easy to understand. 2 is an enlarged cross-sectional view of a main part of the oil separation chamber 17 shown in FIG.

  As shown in FIG. 1, the scroll compressor 10 according to this embodiment includes a housing 11 having a sealed space m inside, and a refrigerant gas (fluid) that is disposed in the housing 11 and taken into the sealed space m. The main component is a scroll compression mechanism 12 for compression and a rotating shaft 13 for driving the scroll compression mechanism 12.

The housing 11 includes a front housing 14 and a rear housing 15, which are combined and then coupled with a plurality of bolts (not shown) to form a sealed space m inside. ing. Reference numeral 16 denotes an O-ring that seals the joint portion between the front housing 14 and the rear housing 15 to keep the sealed space m sealed.
A suction port (not shown) for sucking refrigerant gas is formed in a side portion of the rear housing 15 so as to communicate with the sealed space m, and a scroll compression mechanism 12 is provided on an upper rear side of the rear housing 15. And a discharge port 15a for discharging the compressed refrigerant gas after the lubricating oil in the refrigerant gas is separated by the oil separation chamber 17 is formed. Further, the space formed on the lower rear side of the rear housing 15 is a lubricant separated by the oil separation chamber 17 (that is, the lubricant after the scroll compression mechanism 12 is lubricated and the compression chamber C is sealed) LO. The oil storage chamber 18 for storing

As shown in FIG. 2, the oil separation chamber 17 is a cylindrical space, and an inner wall surface 17 a forming the cylindrical space is along the longitudinal axis L of the oil separation chamber 17, and the inner wall surface 17 a is It is formed so as to be substantially parallel to the longitudinal axis L. That is, the longitudinal axis L shown in FIG. 2 and the line depicting one of the inner wall surfaces 17a in FIG. 2 are substantially parallel (in this embodiment, for example, the longitudinal axis L shown in FIG. In FIG. 2, the angle formed with the line depicting one of the inner wall surfaces 17 a is +1.5 degrees, in other words, the line depicting one of the inner wall surfaces 17 a and the other of the inner wall surface 17 a are depicted in FIG. 2. The angle formed with the line is +3.0 degrees).
Here, “+” means a state in which the inner wall surface 17a is gradually narrowed from the upper side to the lower side in the drawing, that is, a state in which the inner wall surface 17a tapers downward in the drawing.

  In addition, the refrigerant gas (fluid) compressed by the scroll compression mechanism 12 is guided to the tangential direction of the inner wall surface 17a to one end portion (end portion on the discharge port 15a side) of the oil separation chamber 17, and the compressed refrigerant An introduction hole 17b is provided so as to give a gas (fluid) a velocity component in the direction opposite to that of the discharge port 15a. That is, the introduction hole 17b is formed so that the refrigerant gas introduced into the oil separation chamber 17 has a velocity component in the tangential direction of the inner wall surface 17a and in the direction opposite to the discharge port 15a. In other words, the refrigerant gas introduced into the oil separation chamber 17 swirls in the circumferential direction in the oil separation chamber 17, and the lubricating oil LO having a large specific gravity comes into contact with the inner wall surface 17a by the action of the centrifugal force caused by the swirling. Separated from gas. The separated lubricating oil LO moves downward along the inner wall surface 17 a and is stored in the oil storage chamber 18.

The scroll compression mechanism 12 includes a fixed scroll 19 and a turning scroll 20.
The fixed scroll 19 includes a fixed end plate 19a and a spiral wall body 19b standing on the inner surface thereof, and a discharge port 21 is formed at the center of the fixed end plate 19a. The discharge port 21 is opened and closed by a discharge valve 23 attached to the rear surface (back surface) of the fixed end plate 19a via a bolt 22.

  A communication passage 24 that communicates the bottom of the oil storage chamber 18 and the suction side bottom of the sealed space m is formed at the lower end of the fixed scroll 19. To the filter and a spiral pin 26 for adjusting the flow rate.

The orbiting scroll 20 includes an orbiting end plate 20a and a spiral wall body 20b standing on the inner surface thereof. An eccentric bush 28 is rotatably fitted in a boss 27 erected on the outer surface of the swivel end plate 20a via a needle bearing 29, and the rotary shaft 13 is inserted into a hole formed in the eccentric bush 28. An eccentric pin 13a that protrudes from the end is fitted. A plurality of compression chambers C are formed by causing the fixed scroll 19 and the orbiting scroll 20 to be eccentric from each other by a predetermined distance and engaged with each other while shifting the angle by 180 degrees.
Further, an Oldham ring (spinning prevention mechanism) 30 is provided between the orbiting scroll 20 and the front housing 14, and the orbiting scroll 20 does not rotate around the eccentric bush 28 when the rotating shaft 13 is rotated. It is like that. Accordingly, when the rotary shaft 13 is rotated, the orbiting scroll 20 does not rotate but only performs a revolving orbiting motion. The eccentric bush 28 is provided with a balance weight 31 so as to cancel the centrifugal force accompanying the revolution of the orbiting scroll 20.

The rotating shaft 13 is a rotor shaft that rotates about its axis by a driving mechanism (not shown) such as an engine or an electric motor, and the above-described eccentric pin 13a having an eccentric axis is projected from the tip thereof. The rotary shaft 13 is supported by a first bearing 32 and a second bearing 33 provided on the front housing 14 side so as to be rotatable around the axis.
Further, for example, an electromagnetic clutch (not shown) is disposed at one end portion (left end portion in FIG. 1) of the rotating shaft 13, and thereby driving force from an engine, an electric motor, or the like (not shown) It is transmitted to the rotating shaft 13 or not transmitted.
In addition, the code | symbol 34 in a figure is an O-ring which seals the junction part between the fixed scroll 19 and the rear housing 15, and maintains the sealed state of the sealed space m.

  In the scroll compressor 10 having such a structure, when an electromagnetic clutch is engaged, a driving force from an engine, an electric motor or the like is transmitted to the rotating shaft 13 and the rotating shaft 13 is rotated, and this rotation is eccentric pin 13a. , And transmitted through the eccentric bush 28 and the boss 27 to the orbiting scroll 20 of the scroll compression mechanism 12. The orbiting scroll 20 is configured to perform a revolving orbiting motion on a circular orbit having a revolving orbiting radius as a radius while being prevented from rotating by the Oldham ring 30.

  Then, the refrigerant gas enters the sealed space m of the housing 11 through the suction port, and is sucked into the compression chamber C of the scroll compression mechanism 12 through a path not shown. Then, as the volume of the compression chamber C decreases due to the revolving orbiting motion of the orbiting scroll 20, the refrigerant gas reaches the center while being compressed, and the lubricating oil LO is discharged from the discharge port 21 through the discharge chamber 35 and the introduction hole 17b. The contained refrigerant is guided into the oil separation chamber 17 and swung along the inner wall surface 17 a of the oil separation chamber 17. As a result, the lubricating oil LO mixed in the refrigerant falls down while turning along the inner wall surface 17a of the oil separation chamber 17 by the centrifugal separation action, and is stored in the oil reservoir chamber 18 while being lubricated. The refrigerant from which the oil LO has been separated is discharged out of the scroll compressor 10 through the discharge port 15 a of the rear housing 15.

  On the other hand, the lubricating oil LO stored in the oil storage chamber 18 is guided to the suction side bottom of the sealed space m through the communication path 24, and then stirred (raised) by the orbiting scroll 20 before being compressed. In this way, the compression mechanism 12 is lubricated and the sealed space m is sealed.

According to the scroll compressor 10 according to the present embodiment, the downward speed component of the swirling flow that moves downward while swirling along the inner wall surface 17a of the oil separation chamber 17 (the speed component in the direction opposite to the discharge port 15a), It can be reduced more than conventional ones (for example, those disclosed in Japanese Patent Application Laid-Open No. 2003-336588).
Thereby, it is possible to prevent the influence of the swirling flow from reaching the oil level of the lubricating oil LO stored in the oil storage chamber 18, and the oil level of the lubricating oil LO can be maintained in a stable state. Lubricating oil LO stored in the reservoir chamber 18 can be prevented from flowing into the refrigeration cycle from the discharge port 15a together with the refrigerant gas, so that the separation efficiency can be improved and each sliding portion can be improved. Lubricating oil LO can be reliably supplied, the life of the compressor can be extended, and the reliability can be improved.
In addition, the lubricating oil LO separated from the refrigerant gas and flowing down through the inner wall surface 17a of the oil separation chamber 17 is wound up by the refrigerant gas traveling from the oil reservoir chamber 18 toward the discharge port 15a. The refrigerant gas can be prevented from flowing out from the discharge port 15a into the refrigeration cycle.

A second embodiment of the scroll compressor according to the present invention will be described with reference to FIGS.
The scroll compressor in the present embodiment is different from that in the first embodiment described above in that an oil separation chamber 217 is provided instead of the oil separation chamber 17 described above. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  As shown in FIG. 3, the oil separation chamber 217 according to the present embodiment has a bottom plate 17c at the bottom of the oil separation chamber 17 described above, and penetrates in the center direction of the bottom plate 17c in the plate thickness direction. A through hole 17d is formed. That is, the lubricating oil LO that has fallen downward while swirling along the inner wall surface 17a of the oil separation chamber 217 by the centrifugal separation action is once received by the upper surface of the bottom plate 17c, and finally passes through the through hole 17d. Then, it flows into the oil reservoir 18 located below and is stored in the oil reservoir 18.

According to the scroll compressor according to the present embodiment, the oil separation chamber 217 and the oil reservoir chamber 18 are in a state of being partitioned by the bottom plate 17 c provided at the bottom of the oil separation chamber 217. The downward velocity component of the swirling flow that moves downward while swirling along the inner wall surface 17a (the velocity component in the direction opposite to the discharge port 15a) can be reduced as compared with the first embodiment described above. Thereby, it is possible to prevent the influence of the swirling flow from reaching the oil level of the lubricating oil LO stored in the oil storage chamber 18, and the oil level of the lubricating oil LO can be maintained in a stable state. The lubricating oil LO stored in the oil sump chamber 18 can be prevented from flowing into the refrigeration cycle from the discharge port 15a together with the refrigerant gas, and the separation efficiency can be improved. Lubricating oil LO can be reliably supplied to the compressor, the life of the compressor can be extended, and the reliability can be improved.
In addition, the lubricating oil LO separated from the refrigerant gas and flowing down through the inner wall surface 17a of the oil separation chamber 17 is wound up by the refrigerant gas traveling from the oil reservoir chamber 18 toward the discharge port 15a. The refrigerant gas can be prevented from flowing out from the discharge port 15a into the refrigeration cycle.

Further, as shown in FIG. 4, it is more preferable that the inner diameter φd of the through hole 17d is set to be ¼ or less (0.25 times or less) of the (maximum) inner diameter φD of the oil separation chamber 217. It is. By setting the inner diameter φd of the through hole 17d in this way, the oil level height of the lubricating oil LO stored in the oil sump chamber 18 can be kept substantially constant regardless of the rotational speed of the compressor. Lubricating oil LO can be reliably supplied to each sliding portion, the life of the compressor can be extended, and reliability can be improved.
The test results shown in FIG. 4 were obtained using φD of 12 mm and the bottom plate 17 c having a thickness of 3 to 7 mm.

A third embodiment of the scroll compressor according to the present invention will be described with reference to FIG.
The scroll compressor in the present embodiment is different from that in the second embodiment described above in that an oil separation chamber 317 is provided instead of the oil separation chamber 217 described above. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 2nd Embodiment mentioned above.

  As shown in FIG. 5, the oil separation chamber 317 according to the present embodiment has an oil collecting portion 17e on the upper surface of the bottom plate 17c described above, and a through hole 17d is formed in the central portion of the oil collecting portion 17e. ing. The oil collecting portion 17e is a mortar-shaped (funnel-shaped) portion (inclined surface) inclined toward the through-hole 17d, and falls downward while turning along the inner wall surface 17a of the oil separation chamber 217 by a centrifugal separation action. The lubricating oil LO thus led is guided to the through hole 17d along the upper surface of the oil collecting portion 17e, and finally flows through the through hole 17d into the oil storage chamber 18 located below, so that the oil storage chamber 18 To be stored.

  According to the scroll compressor according to the present embodiment, the lubricating oil LO separated in the oil separation chamber 317 can be quickly returned to the oil sump chamber 18 by the oil collecting portion 17e provided on the upper surface of the bottom plate 17c. A decrease in the oil level of the lubricating oil LO stored in the oil storage chamber 18 can be suppressed throughout the compressor operation.

  Other functions and effects are the same as the functions and effects of the second embodiment described above, and a description thereof is omitted here.

In addition, this invention is not limited to the thing of embodiment mentioned above, The angle | corner which the longitudinal direction axis L and the line which drew one side of the inner wall face 17a in FIG. 2 makes smaller than +1.5 degree | times. Thus, it can be set to be preferably +1.0 degrees or less, more preferably 0 degrees.
As a result, when the oil separation chamber is manufactured by casting (for example, die casting) together with the rear housing, the processing becomes very easy, so that the processing process can be simplified and the manufacturing cost can be reduced. Can be reduced.

Further, in the compressor adopting the invention according to Japanese Patent Application No. 2004-324671 filed earlier by the present applicant, an angle formed between the longitudinal axis L and a line depicting one of the inner wall surfaces 17a in FIG. It can also be set to be 1.5 degrees to 0 degrees. That is, the inner wall surface 17a can be gradually narrowed from the lower side to the upper side in the drawing, that is, the inner wall surface 17a can be tapered toward the upper side in the drawing.
As a result, the downward velocity component of the swirling flow that moves downward while swirling along the inner wall surface 17a of the oil separation chamber 17, 217, 317 (the velocity component in the direction opposite to the discharge port 15a) can be further reduced. Further, it is possible to further prevent the influence of the swirling flow from reaching the oil surface of the lubricating oil LO stored in the oil storage chamber 18.

Furthermore, it is further advantageous that the through hole 17d described in the second embodiment is provided so as to contact the inner wall surface 17a.
As a result, the lubricating oil LO that has been swung down while rotating along the inner wall surface 17a of the oil separation chamber 217 is promptly introduced into the oil reservoir chamber 18 without stagnation (collecting) by the peripheral edge of the bottom plate 17c. As a result, it is possible to prevent the lubricating oil LO from flowing out of the discharge port 15a into the refrigeration cycle together with the refrigerant gas, thereby improving the separation efficiency.

Furthermore, the scroll compressor described above can be not only a hermetic type as described above but also a semi-hermetic type or an open type scroll compressor.
In addition, the scroll compressor described above can be used not only for vehicle installation as described above but also for stationary installation.
Furthermore, the compressor is not limited to the scroll compressor as described above, and may be a swash plate compressor, a reciprocating compressor, or the like.
Furthermore, the compressor is not limited to the horizontal type as described above, but may be a vertical type.

It is a figure which shows 1st Embodiment of the compressor by this invention, Comprising: It is a cross-section figure at the time of seeing in the cross section containing the axis line of the rotating shaft. It is a principal part expanded sectional view of the oil separation chamber shown in FIG. It is a figure which shows 2nd Embodiment of the compressor by this invention, Comprising: It is a principal part expanded sectional view of the oil separation chamber with which the said compressor is provided. It is a figure for demonstrating the influence which the ratio of the internal diameter (phi) d of a through-hole and the (maximum) internal diameter (phi) D of an oil separation chamber has on the oil surface of the lubricating oil stored in the oil reservoir chamber. It is a figure which shows 3rd Embodiment of the compressor by this invention, Comprising: It is a principal part expanded sectional view of the oil separation chamber with which the said compressor is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Scroll compressor 11 Housing 12 Compression mechanism 13 Rotating shaft 17 Oil separation chamber 17a Inner wall surface 17c Bottom plate 17d Through-hole 17e Oil collection part (inclined surface)
217 Oil separation chamber 317 Oil separation chamber L Longitudinal axis LO Lubricating oil m Sealed space

Claims (4)

A housing having a space inside;
A compression mechanism that is disposed within the housing and compresses a fluid taken into the space;
A rotating shaft for driving the compression mechanism;
A compressor provided with an oil separation chamber disposed in the housing and separating lubricating oil mixed in the fluid discharged from the compression mechanism from the fluid by centrifugal separation;
The compressor characterized in that an inner wall surface of the oil separation chamber extends so as to be substantially parallel to a longitudinal axis of the oil separation chamber.   The compressor according to claim 1, wherein a bottom portion of the oil separation chamber is closed by a bottom plate, and a through-hole penetrating in the thickness direction is provided in the bottom plate.   The compressor according to claim 2, wherein an inner diameter of the through-hole is set to ¼ or less of an inner diameter of the oil separation chamber.   The compressor according to claim 2 or 3, wherein a mortar-shaped inclined surface having a diameter reduced toward the through hole is formed on a surface of the bottom plate on the oil separation chamber side.

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