US20070269328A1 - Antennas Array Calibration Arrangement and Method - Google Patents
Antennas Array Calibration Arrangement and Method Download PDFInfo
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- US20070269328A1 US20070269328A1 US10/556,357 US55635704A US2007269328A1 US 20070269328 A1 US20070269328 A1 US 20070269328A1 US 55635704 A US55635704 A US 55635704A US 2007269328 A1 US2007269328 A1 US 2007269328A1
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- Prior art keywords
- working fluid
- calibration
- compressor
- oil
- container
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
Definitions
- the present invention relates to a compressor used for a refrigerator-freezer, an air conditioner and the like.
- a hermetical type rotary compressor is widely used for a refrigerator-freezer, an air conditioners and the like because it is small in size and its structure is simple.
- a structure of the hermetical type rotary compressor such as a rotary compressor and a scroll compressor is described in a non-patent document 1. The structure of the hermetical type rotary compressor will be explained with reference to FIGS. 19 and 20 based on a rotary compressor (compressor, hereinafter).
- FIG. 19 is a vertical sectional view of a conventional compressor.
- the compressor shown in the drawings comprises a hermetical container 1 , a shaft 2 having an eccentric portion 2 a, a cylinder 3 , a roller 4 , a vane 7 , a spring 8 , an upper bearing 9 and a lower bearing 10 .
- the compressor also comprises a compression mechanism disposed in a lower portion of the hermetical container 1 , and a rotational motor having a stator 11 and a rotor 12 .
- the stator 11 is provided at its upper end lower ends with coil ends 11 b and 11 d.
- the rotational motor is disposed above the hermetical container 1 .
- a plurality of notches 11 a are formed in an outer periphery of the stator 11 .
- the notches 11 a serve as flow paths for working fluid.
- the hermetical container 1 is provided at its upper portion with an introducing terminal 13 which energizing a rotational motor in the hermetical container 1 , and a discharge pipe 14 for introducing working fluid from the hermetical container 1 into a refrigeration cycle.
- the discharge pipe 14 is in communication with inside the hermetical container 1 .
- the discharge pipe 14 is located above the upper coil end 11 b of the stator 11 so that a suction port 14 a of the discharge pipe 14 does not come into contact with the stator 11 and the rotor 12 of the rotational motor.
- the hermetical container 1 is provided at its side surface with a suction pipe 15 for introducing working fluid from the refrigeration cycle into the compressor. Refrigeration oil is reserved in an oil reservoir 16 formed in a bottom of the hermetical container 1 .
- a cluster 26 is mounted on the introducing terminal 13 , a lead wire 25 from the stator 11 of the rotational motor is connected to the cluster 26 so that current is supplied to the rotational motor from the introducing terminal 13 .
- the rotational motor of the compressor is energized to rotate the rotor 12 , the roller 4 rotates eccentrically by the eccentric portion 2 a, and capacities of the compressor (not shown) and a suction chamber 5 formed in the cylinder 3 are varied. With this eccentric rotation, the working fluid is drawn into the suction chamber 5 , and compressed in a compression chamber. The compressed working fluid is mixed with fog drip (oil mist, hereinafter) of refrigeration oil which is supplied from the oil reservoir 16 and lubricates the compression mechanism.
- fog drip oil mist, hereinafter
- This mixture is discharged into a lower space 17 of the rotational motor through the discharging hole 9 b, and passes through the notches 11 a of the stator 11 and a gap 18 between the stator 11 and the rotor 12 , and flows into an upper space 19 of the rotational motor.
- the working fluid is discharged out from the discharge pipe 14 , but the refrigeration oil mixed with the working fluid is also discharged at the same time. Therefore,in the conventional compressor, in order to enhance the reliability of the compressor and the efficiency of the refrigeration cycle, the oil is separated from the working fluid to prevent the refrigeration oil from being discharged out from the hermetical container 1 .
- FIG. 21 is a detailed sectional view of peripheries of the oil-separating plate.
- the rotor 12 includes an upper end plate 21 a and a lower end plate 21 b for closing an insertion hole of a permanent magnet 20 .
- a plurality of through holes 12 a formed in the rotor 12 in the vertical direction and an oil-separating plate 23 disposed above exits of the through holes 12 a are fixed to the rotor 12 by a fixing member 24 .
- the oil-separating plate 23 forms an oil-separating space 22 between an upper surface of the rotor 12 and the oil-separating plate 23 .
- a portion of working fluid including oil mist discharged from the compression mechanism into the lower space 17 of the rotational motor flows into the oil-separating space 22 through the through holes 12 a.
- the working fluid is radially discharged from an outer peripheral exit of the oil-separating plate 23 by a centrifugal force, and the working fluid is sprayed on the coil end 11 b of the stator 11 , and the working fluid and the oil mist included therein are separated from each other.
- Only the working fluid from which the oil is separated flows upward and is discharged out from the discharge pipe 14 provided in the upper portion in the hermetical container 1 .
- the refrigeration oil attached to the coil end 11 b of the stator 11 drops downward and is returned into the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- a working fluid flows from the lower space 17 of the rotational motor to the upper space 19 through the notches 11 a formed in the outer periphery of the stator 11 and the gap 18 between the stator 11 and the rotor 12 .
- the working fluid passes through the through holes 12 a of the rotor 12 .
- the gap 18 between the stator 11 and the rotor 12 is as narrow as 0.5 mm to enhance the efficiency of the rotational motor. Thus, a rate of the working fluid flowing through the gap is extremely small.
- the cluster 26 disposed in the upper space 19 is a thin and long rectangular solid and is eccentric from the axial center of the hermetical container 1 . Therefore, there is generated a force which hinders a turning flow around a rotation center axis L in the upper space 19 caused by rotation of the rotor 12 . Therefore, the flow velocity of turning flow is slow and uneven. Thus, the working fluid and the refrigeration oil are not separated from each other sufficiently.
- the present invention has been accomplished to solve the above problems, and it is an object of the invention to obtain a refrigeration cycle having high efficiency by easily and inexpensively enhancing the oil-separating efficiency to reduce an amount of refrigeration oil which is taken out from a hermetical container and to enhance the reliability of the compressor without deteriorating the efficiency of a rotational motor.
- a first aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container: a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; and a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; wherein the working fluid is discharged from said container through said discharge pipe; and wherein said discharge pipe has an open end in said container, the open end being located inside said coil end provided on the upper end of said stator.
- the open end in the hermetical container since the open end in the hermetical container is located inside the coil end, the working fluid introduced into the upper space of the container from the gap between the rotational motor and the container flows from upward to downward toward the inside of the coil end, and the working fluid introduced into the coil end flows toward the open end of the discharge pipe. Therefore, when the flowing direction of the working fluid is changed in this manner, the oil mist of the refrigeration oil having high density reaches closer to the rotor than the working fluid.
- the oil mist of the refrigeration oil which reaches the vicinity of the rotor is separated from the working fluid by centrifugal force by means of the rotational flow caused by rotation of the rotor, and attaches to the inner peripheral surface of the coil end.
- said discharge pipe has a curved portion in said container.
- said discharge pipe is provided on a side surface of said container.
- the discharge pipe passing through the side surface of the container has the curved portion in the hermetical container, the open end in the container can easily be located inside the coil end. Therefore, the oil is separated by the gravity caused by changing the flowing direction and by the centrifugal force of the turning flow, and it is possible to prevent the refrigeration oil from being delivered outside the container. Since the upper portion in the container can freely be used, the flexibility in design of the compressor can be enhanced.
- the open end of said discharge pipe in said container is disposed to face downstream of a rotational direction of said rotor.
- the open end of said discharge pipe in said container is located in a vicinity of a rotation center axis of said rotor.
- an inner diameter of the open end of said discharge pipe located inside said container is larger than an inner diameter of said discharge pipe located outside of said container.
- a seventh aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container; a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; and a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; and a substantially cylindrical dividing member provided in the upper space of said container and being operable to divide the upper space into an inner space and an outer space; wherein said discharge pipe has an open end in said container, the open end being located inside said substantially cylindrical dividing member; and wherein the working fluid is discharged from said container through said discharge pipe.
- the dividing member since the dividing member is provided, the turning flow of the working fluid generated by the rotor in the inner space is not dispersed to the outer space, the development of the turning flow is accelerated, and the oil is sufficiently separated by the centrifugal force caused by the turning flow.
- the oil mist can attach the inner wall surface of the dividing member reliably, and the oil mist can be returned into the oil reservoir as liquid drop. Therefore, it is possible to prevent the refrigeration oil from being discharged from the discharge pipe together with the working fluid.
- a gap is provided between an upper end of said dividing member and said container.
- said dividing member is provided with a communication hole between the inner space and the outer space.
- the dividing member is provided with the communication hole which brings the inner space and the outer space into communication with each other, the upper end of the dividing member can be brought into contact with the upper end surface in the container and fixed thereto, and the positioning precision of the dividing member when the compressor is assembled is enhanced.
- said dividing member is provided inside said coil end provided on the upper end of said stator.
- the dividing member is provided inside, the region of the inner space is reduced, the dispersion of the rotational motion energy of the turning flow is suppressed, and the working fluid receives strong centrifugal force. Therefore, the oil mist separation effect by the centrifugal force is enhanced.
- said dividing member is provided outside said coil end provided on the upper end of said stator.
- the dividing member is provided outside, the coil end having complicated surface shape comes inside the dividing member. With this, the refrigeration oil attached to the surface of the coil end is prone to grow into the liquid drop, and the oil separation effect is enhanced.
- an inner diameter of an upper portion of said dividing member is smaller than an inner diameter of a lower portion of said dividing member.
- an upper portion of said container is domical in shape.
- a fourteenth aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container; a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; an introduction terminal provided in said container and being operable to supply electricity to said rotational motor: and a cluster provided in said container and being adapted to connect a lead wire from said rotational motor to said introduction terminal; wherein said cluster is symmetric with respect to an axis thereof, the axis of said cluster being substantially coincident with a rotation central axis of said rotational motor: and wherein the working fluid is discharged from said container through said discharge pipe.
- the turning flow is generated in the upper space of the container by the high speed rotation of the rotational motor, but since the cluster is symmetric with respect to the axis and the cluster and the rotation center axis of the rotational motor substantially coincide with each other, the turning flow is also generated around the cluster. Therefore, the oil mist introduced into the upper space of the container together with the working fluid is separated by centrifugal force caused by the turning flow and the oil mist attaches to the inner wall surface of the hermetical container, and the oil mist flows and drops downward ad oil drop. Therefore, the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- the compressor of any one of the first aspects further comprising: an introduction terminal provided in said container and being operable to supply electricity to said rotational motor; and a cluster adapted to connect a lead wire from said rotational motor to said introduction terminal, wherein said cluster is symmetric with respect to a center axis thereof, the center axis being substantially coincident with a rotation center axis of said rotational motor.
- the turning flow is generated in the upper space of the container by the high speed rotation of the rotational motor, but since the cluster is symmetric with respect to the axis and the cluster and the rotation center axis of the rotational motor substantially coincide with each other, the turning flow is also generated around the cluster. Therefore, the oil mist introduced into the upper space of the container together with the working fluid is separated by centrifugal force caused by the turning flow and the oil mist attaches to the inner wall surface of the container, and the oil mist flows and drops downward ad oil drop. Therefore,the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- said cluster is columnar in shape.
- said cluster is polygonal columnar in shape.
- the side surface of the polygonal shape becomes an obstruction, and downward flow along the side surface is generated.
- the effect for downwardly dropping the oil mist as oil drop is enhanced, and the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- an outer diameter of said cluster is smaller than an inner diameter of said coil end.
- carbon dioxide is used as the working fluid.
- carbon dioxide can be used as the working fluid.
- FIG. 1 is a vertical sectional view of a compressor according to a first embodiment of the present invention
- FIG. 2 is a lateral sectional view of the compressor shown in FIG. 1 taken along arrows X-X;
- FIG. 3 is a vertical sectional view of a compressor according to a second embodiment of the invention.
- FIG. 4 is a lateral sectional view of the compressor shown in FIG. 3 taken along arrows Y-Y;
- FIG. 5 is a vertical sectional view of a compressor according to a third embodiment of the invention.
- FIG. 6 is a lateral sectional view of the compressor shown in FIG. 5 taken along arrows Z-Z;
- FIG. 7 is a vertical sectional view of a compressor according to a fourth embodiment of the invention.
- FIG. 8 is a vertical sectional view of a compressor according to a fifth embodiment of the invention.
- FIG. 9 is a vertical sectional view of a compressor according to a sixth embodiment of the invention.
- FIG. 10 is a vertical sectional view of a compressor according to a seventh embodiment of the invention.
- FIG. 11 is a lateral sectional view of the compressor shown in FIG. 10 taken along arrows X-X:
- FIG. 12 is a vertical sectional view of a compressor according to an eighth embodiment of the invention.
- FIG. 13 is a vertical sectional view of a compressor according to a ninth embodiment of the invention.
- FIG. 14 is a vertical sectional view of a compressor according to a tenth embodiment of the invention.
- FIG. 15 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows X-X;
- FIG. 16 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows Y-Y;
- FIG. 17 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows Z-Z;
- FIG. 18 is a lateral sectional view of a compressor according to an eleventh embodiment of the invention.
- FIG. 19 is a vertical sectional view of a conventional compressor
- FIG. 20 is a perspective view of a cluster of the conventional compressor.
- FIG. 21 is a detailed sectional view of peripheries of an oil-separating plate.
- FIG. 1 is a vertical sectional view of a compressor according to the first embodiment of the present invention
- FIG. 2 is a lateral sectional view of the compressor shown in FIG. 1 taken along arrows X-X.
- the compressor of the first embodiment of the invention has almost the same structure as that of the above-described conventional compressor, and the same elements are designated with the same symbols.
- the compressor of this embodiment comprises a hermetical container 1 , a compression mechanism disposed in a lower portion in the hermetical container 1 , and a rotational motor disposed above the compression mechanism.
- the compression mechanism comprises a shaft 2 which can rotate about a rotation center axis L, a cylinder 3 having a cylindrical surface 3 a therein, a roller 4 which is fitted over an eccentric portion 2 a of the shaft 2 and which eccentrically rotates in the cylinder 3 as the shaft 2 rotates, a vane 7 which reciprocates in a vane groove 3 b of the cylinder 3 while a tip end of the vane 7 being in contact with the roller 4 and which divides a space defined by the cylinder 3 and the roller 4 into a suction chamber 5 and a compression chamber 6 , a spring 8 which is disposed on a back surface of the vane 7 and which pushes the vane 7 against the roller 4 , and an upper bearing 9 and a lower bearing 10 which support the shaft 2 .
- the upper bearing 9 includes a flow path 9 a which is connected to a suction pipe 15 and which introduces working fluid drawing from the suction pipe 15 into the suction chamber 5 , and a discharging hole 9 b which discharges working fluid compressed in the compression chamber 6 into the lower space 17 of the rotational motor.
- the rotational motor comprises a stator 11 shrinkage fitted into the hermetical container 1 , and a rotor 12 shrinkage fitted to the shaft 2 .
- the stator 11 is provided at its upper end with a coil end 11 b and at its lower end with a coil end lid.
- the stator 11 is provided at its outer periphery with a plurality of notches 11 a which bring the lower space 17 and the upper space 19 into communication with each other.
- the notches 11 a serve as flow paths for working fluid.
- the hermetical container 1 is provided at its upper portion with an introducing terminal 13 which energizes the rotational motor in the hermetical container 1 , and a discharge pipe 31 which introduces working fluid from the upper space 19 in the hermetical container 1 into a refrigeration cycle outside the hermetical container 1 .
- Refrigeration oil is reserved in an oil reservoir 16 formed in a bottom of the hermetical container 1 .
- the discharge pipe 31 is in communication with inside of the hermetical container 1 .
- a suction port 31 a as an open end of the hermetical container is located at inner side of an upper coil end 11 b of the stator 11 , i.e., below an upper end surface 11 c of the coil end 11 b.
- the discharge pipe 31 is a straight pipe, and is mounted on an upper portion of the hermetical container 1 at a location closer to a center than an inner diameter of the coil end 11 b.
- the introducing terminal 13 is mounted at a position of the upper portion of the hermetical container 1 where the mounting of the discharge pipe 31 is not hindered.
- the through holes 12 a (see FIG. 11 ) of the rotor 12 by the same oil-separating plate method as that of the conventional technique is not provided.
- the working fluid is introduced from the suction pipe 15 into the suction chamber 5 through the flow path 9 a provided in the upper bearing 9 . If the rotational motor is energized and the shaft 2 which is integral with the rotor 12 is rotated, the roller 4 eccentrically rotates, the capacities of the suction chamber 5 and the compression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharging hole 9 b is opened, oil mist which is supplied from the oil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into the lower space 17 of the rotational motor.
- the working fluid in the lower space 17 passes through notches 11 a formed in the outer periphery of the stator 11 as gaps between the rotational motor and the hermetical container 1 , and through a gap 18 (air gap) between the stator 11 and the rotor 12 , and flows into the upper space 19 of the rotational motor.
- the working fluid is separated from the refrigeration oil in the upper space 19 , and is discharged from the discharge pipe 14 .
- the working fluid which passed through the notches 11 a of the stator 11 flows upward to the vicinity of the coil end 11 b of the stator 11 and then, flows toward a central portion of the hermetical container 1 through an upper portion of the coil end 11 b. Thereafter, the working fluid flows downward toward the suction port 31 a of the discharge pipe 31 which is disposed inside the coil end 11 b and directed downward.
- the working fluid is drawn into the suction port 31 a of the discharge pipe 31 , the working fluid again flows upward. At that time, the oil mist having high density drop downward due to gravity, and reaches closer to an upper surface 12 b of the rotor 12 as compared with the working fluid.
- the working fluid flows such as to turn due to the viscosity, and as closer to the upper surface 12 b of the rotor 12 , the turning flow velocity is increased. Therefore, the oil mist has higher density than the working fluid and the oil mist reaches a region where the flow velocity of the turning flow in the vicinity of the upper surface 12 b of the rotor 12 is greater.
- the oil mist attaches to an inner peripheral surface of the stator 11 or the coil end 11 b by the centrifugal force and becomes liquid drop and is returned to the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid is introduced into the suction port 31 a of the discharge pipe 31 .
- the suction port 31 a is located inside the coil end 11 b in this embodiment as described above. Therefore, when the working fluid flowing from the notches 11 a toward the suction port 31 a flows through the upper space 19 upward, downward and upward, the gravity acts on the oil mist, and when the working fluid entering into the coil end 11 b and coming into contact with the rotor 12 turns together with the rotor 12 by the viscosity, the centrifugal force is applied to the oil mist and the refrigeration oil is separated from the working fluid. With this, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- a compressor according to the second embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in FIGS. 1 and 2 except the discharge pipe and the introducing terminal. The same elements are designated with the same symbols.
- FIG. 3 is a vertical sectional view of a compressor according to the second embodiment of the invention
- FIG. 4 is a lateral sectional view of the compressor shown in FIG. 3 taken along arrows Y-Y.
- the compressor of this embodiment comprises the hermetical container 1 , the compression mechanism disposed at a lower portion in the hermetical container 1 and having the shaft 2 , the cylinder 3 , the roller 4 , the vane 7 and the like.
- the compressor also comprises the rotational motor disposed above the compression mechanism and having the stator 11 , the rotor 12 and the like.
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 1
- the discharge pipe 32 for introducing the working fluid from the hermetical container 1 into the refrigeration cycle.
- the discharge pipe 32 extends into the hermetical container 1 , and has a curved portion 32 b inside the hermetical container 1 .
- a suction port 32 a of the discharge pipe 32 is located inside the coil end 11 b on the upper end of the stator 11 .
- the suction port 32 a of the discharge pipe 32 is located closer to an inner peripheral surface of the coil end 11 b than a central portion of the hermetical container 1 .
- the suction port 32 a extends diagonally downward toward substantially the downstream in the rotation direction of the upper surface 12 b of the rotor 12 .
- the through holes 12 a (see FIG. 11 ) of the rotor 12 is not provided.
- the oil-separating operation of the compressor having the above structure will be explained.
- the working fluid including oil mist discharged from the compression mechanism into the lower space 17 of the rotational motor passes through the notches 11 a of the stator 11 and the gap 18 between the stator 11 and the rotor 12 and moves to the upper space 19 of the rotational motor.
- the gap 18 is extremely narrow, the rate of working fluid passing through the notches 11 a of the stator 11 becomes extremely large.
- the working fluid which passed through the notches 11 a of the stator 11 flows upward to the vicinity of the coil end 11 b of the stator 11 and then, flows toward a central portion of the hermetical container 1 through an upper portion of the coil end 11 b. Thereafter, the working fluid flows downward toward the suction port 32 a of the discharge pipe 32 which is disposed inside the coil end 11 b. Then, the working fluid is drawn into the suction port 32 a and again flows upward. Since the suction port 32 a of the discharge pipe 32 extends diagonally downward as in the first embodiment, the oil-separating effect of the refrigeration oil when the flow of the working fluid is changed from downward to the upward can be obtained.
- the working fluid reaches the vicinity of the suction port 32 a of the discharge pipe 32 , since the upper surface 12 b of the rotor 12 is rotational immediately below the suction port 32 a, the working fluid turns by the viscosity. Since the suction port 32 a of the discharge pipe 32 is directed downstream of the turning flow, when the turning flow is drawing from the suction port 32 a, the direction of the flow is abruptly changed from the downstream direction to the upstream direction with respect to the turning flow.
- the oil mist having high density flows further downstream by the inertial force and at the same time, the oil mist attaches to the inner peripheral surface of the coil end 11 b and becomes liquid drop by the centrifugal force of the turning flow, and the oil mist is returned to the oil reservoir 16 formed in the bottom of the hermetical container 1 by the gravity.
- the working fluid is introduced into the suction port 32 a of the discharge pipe 32 .
- the suction port 32 a is located inside the coil end 11 b and is opened toward the downstream of the rotational direction of the rotor 12 , the oil-separating effect is further enhanced as compared with the first embodiment by the change of flowing direction of the working fluid, and by the gravity and the centrifugal force applied to the oil mist which turns, and by the inertial force applied to the oil mist when the flowing direction of the working fluid is changed from the downstream flowing to the upstream flowing. With this, it is possible to further suppress the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor together with the working fluid.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to more efficiently prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to further enhance the reliability and efficiency of the compressor.
- the discharge pipe 32 has the curved portion 32 b, it is possible to position the suction port 32 a inside the coil end 11 b irrespective of a position where the suction port 32 a is mounted on the hermetical container 1 . Therefore, it is possible to give a high priority to the position of the introducing terminal 13 and the like in the upper portion in the hermetical container 1 , and the flexibility in design can largely be enhanced. For example, it is unnecessary to deviate the mounting position of the introducing terminal 13 so that the introducing terminal 13 does not hinder the discharge pipe 31 unlike the first embodiment, and the introducing terminal 13 can be disposed in the center of the container.
- a compressor according to the third embodiment of the present invention has the same structure as that of the compressor of the second embodiment as shown in FIGS. 3 and 4 except the discharge pipe.
- the same elements are designated with the same symbols.
- FIG. 5 is a vertical sectional view of a compressor according to the third embodiment of the invention
- FIG. 6 is a lateral sectional view of the compressor shown in FIG. 5 taken along arrows Z-Z.
- the compressor of this embodiment comprises the hermetical container 1 , the compression mechanism disposed at a lower portion in the hermetical container 1 and having the shaft 2 , the cylinder 3 , the roller 4 , the vane 7 and the like.
- the compressor also comprises the rotational motor disposed above the compression mechanism and having the stator 11 , the rotor 12 and the like.
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 1
- the discharge pipe 33 for introducing the working fluid from the hermetical container 1 into the refrigeration cycle.
- the discharge pipe 33 extends into the hermetical container 1 , and has a curved portion 33 b inside the hermetical container 1 .
- a suction port 33 a of the discharge pipe 33 is located inside the coil end 11 b on the upper end of the stator 11 .
- the suction port 33 a of the discharge pipe 33 is disposed in the vicinity of the rotation center axis L of the rotor 12 and is directed diagonally downward. In this embodiment, the through holes 12 a (see FIG. 11 ) of the rotor 12 is not provided.
- the working fluid which passed through the notches 11 a of the stator 11 flows upward to the vicinity of the coil end 11 b of the stator 11 and then, flows toward a central portion of the hermetical container 1 through an upper portion of the coil end 11 b. Thereafter, the working fluid flows downward toward the suction port 33 a of the discharge pipe 33 located inside the coil end 11 b. Then, the working fluid is drawn into the suction port 33 a which is directed diagonally downward and again flows upward. With this change in flowing direction, the oil mist having high density drops downward by the gravity, and the refrigeration oil is separated.
- the working fluid reaches the vicinity of the suction port 33 a of the discharge pipe 33 , since the upper surface 12 b of the rotor 12 is rotational immediately below the suction port 33 a, the working fluid turns by the viscosity. At that time, since the oil mist has higher density than that of the working fluid, the oil mist moves outward by the centrifugal force, the oil mist attaches to the inner peripheral surface of heat exchanger stator 11 or the coil end 11 b and becomes liquid drop, and is returned to the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the suction port 33 a of the discharge pipe 33 is located at substantially the central portion in the turning flow in the vicinity of the rotation center axis L, the oil mist which is largely affected by the centrifugal force is removed substantially completely, and the refrigeration oil is separated from the working fluid which is less affected by the centrifugal force, and the working fluid is introduced into the suction port 33 a of the discharge pipe 33 .
- the introducing terminal 13 is disposed on the upper end of the hermetical container 1 , the discharge pipe 33 passes through from the center of the upper portion of the hermetical container 1 , and the suction port 33 a is straight in shape and is located inside the coil end 11 b.
- the suction port 33 a is located inside the coil end 11 b.
- the oil mist can be removed by the gravity of the change of flowing direction.
- the suction port 33 a is opened in the vicinity of the rotation center axis L of the rotor 12 , the working fluid from which the oil mist is sufficiently removed can be drawn by the effect of the centrifugal force of the turning flow.
- the oil-separating operation is further facilitated as compared with the first embodiment. With this, it is possible to further suppress the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor together with the working fluid.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to more efficiently prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to further enhance the reliability and efficiency of the compressor.
- a compressor according to the fourth embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in FIGS. 1 and 2 except the discharge pipe and the introducing terminal. The same elements are designated with the same symbols.
- FIG. 7 is a vertical sectional view of a compressor according to the fourth embodiment of the invention.
- the compressor of this embodiment comprises the compression mechanism disposed at a lower portion in the hermetical container 1 and having the shaft 2 , the cylinder 3 , the roller 4 , the vane 7 and the like.
- the compressor also comprises the rotational motor disposed above the compression mechanism and having the stator 11 , the rotor 12 and the like. Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container.
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 1 is provided in an upper portion of the hermetical container 1 .
- the hermetical container 1 is provided at its side surface with a discharge pipe 34 for introducing working fluid from the hermetical container 1 into the refrigeration cycle.
- the discharge pipe 34 passes through the side surface of the hermetical container 1 , and has a curved portion 34 b.
- a suction port 34 a as an open end of the hermetical container is located inside the coil end 11 b of the stator 11 .
- the through holes 12 a (see FIG. 11 ) of the rotor 12 is not provided.
- the discharge pipe 34 passes through the side surface of the hermetical container 1 , an upper portion in the hermetical container 1 can be used freely, and layout of the introducing terminal 13 is not limited.
- the discharge pipe 34 can be connected directly, and there is effect that the structure of the refrigeration cycle becomes simple. In other words, the flexibility in design of the compressor can largely be enhanced.
- the suction port 34 a of the discharge pipe 34 is disposed closer to the inner peripheral surface of the coil end 11 b than the central portion of the hermetical container 1 as in the second embodiment, and the suction port 34 a is directed toward substantially the downstream in the rotation direction of the upper surface 12 b of the rotor 12 .
- the same effect as that of the third embodiment can be obtained if the suction port 34 a of the discharge pipe 34 is disposed in the vicinity of the rotation center axis L as in the third embodiment.
- a compressor according to the fifth embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in FIGS. 1 and 2 except the discharge pipe.
- the same elements are designated with the same symbols.
- FIG. 8 is a vertical sectional view of a compressor according to the fifth embodiment of the invention.
- the compressor of this embodiment comprises the compression mechanism disposed at a lower portion in the hermetical container land having the shaft 2 , the cylinder 3 , the roller 4 , the vane 7 and the like.
- the compressor also comprises the rotational motor disposed above the compression mechanism and having the stator 11 , the rotor 12 and the like.
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container.
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 1
- the discharge pipe 35 for introducing the working fluid from the hermetical container 1 into the refrigeration cycle.
- the discharge pipe 35 is mounted in an upper portion of the hermetical container 1 closer to the center thereof than an inner diameter of the coil end 11 b, and passes through the hermetical container 1 .
- a suction port 35 a of the discharge pipe 35 is located inside the coil end 11 b of the stator 11 .
- the discharge pipe 35 is straight pipe having a step, i.e., an inner diameter of the discharge pipe 35 in the vicinity of the suction port 35 a is enlarged.
- the through holes 12 a (see FIG. 11 ) of the rotor 12 is not provided.
- the suction port 35 a of the discharge pipe 35 is located inside the coil end 11 b as in the first embodiment, the same effect as that of the first embodiment can be obtained of course.
- the refrigeration oil near the suction port 35 a is more prone to be drawn together with the working fluid before the refrigeration oil is separated from the working fluid by the gravity and the centrifugal force.
- the inner diameter of the discharge pipe 35 in the vicinity of the suction port 35 a is enlarged, the flow velocity of the working fluid in the vicinity of the suction port 35 a of the discharge pipe 35 is smaller as compared with a case in which the inner diameter is enlarged. Therefore, the amount of oil mist which is drawn together with the working fluid can be reduced, and the refrigeration oil-separating effect of the first to third embodiments can further be enhanced.
- the suction port 35 a of the discharge pipe 35 is disposed closer to the inner peripheral surface of the coil end 11 b than the central portion of the hermetical container 1 as in the second embodiment, and the suction port 35 a is directed diagonally downward toward substantially the downstream in the rotation direction of the upper surface 12 b of the rotor 12 .
- the same effect as that of the third embodiment can be obtained if the suction port 35 a of the discharge pipe 35 is disposed in the vicinity of the rotation center axis L as in the third embodiment and the discharge pipe 35 is directed diagonally downward.
- a compressor according to the sixth embodiment of the present invention has the same structure as that of the compressor of the second embodiment as shown in FIGS. 3 and 4 except the hermetical container and the discharge pipe. The same elements are designated with the same symbols.
- FIG. 9 is a vertical sectional view of a compressor according to the sixth embodiment of the invention.
- the compression mechanism comprising the shaft 2 , the cylinder 3 , the roller 4 , the vane 7 and the like is disposed in a lower portion in a hermetical container 36
- the rotational motor comprising the stator 11 and the rotor 12 is disposed in an upper portion in the hermetical container 36 .
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container 36 .
- Each of the upper portion of the bottom (including inner surface of the container) of the hermetical container 36 is domical in shape which comprises a combination of a peripheral r-portion 36 a having a smaller diameter and an inner R-portion 36 b having a larger diameter.
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 36 and a discharge pipe 37 for introducing working fluid from the hermetical container 36 into the refrigeration cycle are provided in an upper portion of the hermetical container 36 .
- the discharge pipe 37 passes through the hermetical container 36 , and the suction port 37 a is located inside the coil end 11 b on the upper end of the stator 11 .
- the suction port 37 a of the discharge pipe 37 is located inside the coil end 11 b as in the first embodiment, the same effect as that of the first embodiment can be obtained of course.
- the working fluid which passed through the notches 11 a of the stator 11 flows upward to the vicinity of the coil end 11 b of the stator 11 and then, passes through the upper portion of the coil end 11 b and flows toward the center of the hermetical container 36 .
- the working fluid flows toward the center of the hermetical container 36 along the r-portion 36 a and the R-portion 36 b, and it is possible to prevent the flow velocity from being lowered. Therefore, after that, the downward flow velocity toward the suction port 37 a of the discharge pipe 37 located inside the coil end 11 b is also increased.
- the working fluid is drawn into the suction port 37 a of the discharge pipe 37 , the flow of the working fluid is again changed into the upward flow, but the oil-separating effect by the gravity and the centrifugal force at that time can further be enhanced.
- the refrigeration cycle is a supercritical cycle of working fluid having carbon dioxide as main composition.
- the strength of the hermetical container 36 can be maintained and safety can be secured.
- working fluid having the environment-friendly carbon dioxide as main composition the working fluid in the hermetical container 1 or 36 is in the supercritical state, and the meltage of the refrigeration oil with respect to the working fluid is increased.
- the oil-separating effect obtained by the gravity and the centrifugal force is enhanced, and the object of the present invention can be achieved.
- FIG. 10 is a vertical sectional view of a compressor according to the seventh embodiment of the invention
- FIG. 11 is a lateral sectional view of the compressor shown in FIG. 10 taken along arrows X-X.
- the compressor according to the seventh embodiment of the present invention has almost the same structure as that of the conventional compressor. The same elements are designated with the same symbols.
- the compressor of this embodiment comprises the hermetical container 1 , the compression mechanism disposed in a lower portion in the hermetical container 1 , and the rotational motor disposed in an upper portion in the hermetical container 1 .
- the compression mechanism comprises the shaft 2 capable of rotational around the rotation center axis L, the cylinder 3 having the cylindrical surface 3 a therein, the roller 4 fitted over the eccentric portion 2 a of the shaft 2 and eccentrically rotational inside the cylinder 3 with the rotation of the shaft 2 , the vane 7 which reciprocates within the vane groove 3 b of the cylinder 3 while a tip end of the vane 7 being in contact with the roller 4 and which divides a space defined by the cylinder 3 and the roller 4 into the suction chamber 5 and the compression chamber 6 , the spring 8 which is disposed on a back surface of the vane 7 and which pushes the vane 7 against the roller 4 , and the upper bearing 9 and a lower bearing 10 which support the shaft 2 .
- the upper bearing 9 includes a flow path 9 a which is connected to the suction pipe 15 and which introduces working fluid drawing from the suction pipe 15 into the suction chamber 5 , and the discharging hole 9 b which discharges working fluid compressed in the compression chamber 6 into the lower space 17 of the rotational motor.
- the rotational motor comprises the stator 11 shrinkage fitted into the hermetical container 1 , and the rotor 12 which is shrinkage fitted to the shaft 2 and rotates in the inner periphery of the stator 11 .
- the stator 11 is provided at its upper end with the coil end 11 b and at its lower end with the coil end 11 d.
- the stator 11 is provided at its outer periphery with a plurality of notches 11 a which bring the lower space 17 and the upper space 19 into communication with each other.
- the notches 11 a serve as flow paths for working fluid.
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- a thin cylinder 41 as a dividing member is fitted over the coil end 11 b formed on the upper end of the stator 11 , and an upper space 19 of the rotational motor is divided by the thin cylinder 41 into an inner space 19 a and an outer space 19 b.
- This thin cylinder 41 is made of insulative Teflon (registered trademark), and its thickness of about 1 mm.
- the thin cylinder 41 has a bent portion 41 a formed in the vicinity of the upper end surface 11 c of the coil end 11 b.
- An inner diameter of the bent portion 41 a of the thin cylinder 41 is reduced toward its top, and a gap 44 serving as a flow path of the working fluid is formed between an upper end 41 b of the thin cylinder 41 and an upper end surface 1 a of the hermetical container 1 .
- the introducing terminal 13 for energizing the rotational motor in the hermetical container 1 and the discharge pipe 40 for introducing the working fluid from the upper space 19 in the hermetical container 1 into the refrigeration cycle are provided in an upper portion in the hermetical container 1 .
- the discharge pipe 40 passes through the hermetical container 1 , and has a curved portion 40 b inside the hermetical container 1 .
- a suction port 40 a of the discharge pipe 40 as an open end of the hermetical container is located below the gap 44 inside the thin cylinder 41 (i.e., inside the inner space 19 a ). That is, the suction port 40 a is disposed at a lower position than the upper end 41 b of the thin cylinder 41 .
- the suction port 40 a of the discharge pipe 40 is disposed in the vicinity of the rotation center axis L of the rotor 12 and is directed diagonally downward. Therefore, the introducing terminal 13 is mounted at a position where the mounting of the discharge pipe 40 provided on the upper portion of heat exchanger hermetical container 1 is not hindered.
- the through holes 12 a (see FIG. 6 ) of the rotor 12 by the same oil-separating plate method as that of the conventional technique is not provided.
- the working fluid is introduced from the suction pipe 15 into the suction chamber 5 through the flow path 9 a provided in the upper bearing 9 . If the rotational motor is energized and the shaft 2 which is integral with the rotor 12 is rotated, the roller 4 eccentrically rotates, the capacities of the suction chamber 5 and the compression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharging hole 9 b is opened, oil mist which is supplied from the oil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into the lower space 17 of the rotational motor.
- the working fluid in the lower space 17 passes through notches 11 a formed in the outer periphery of the stator 11 as gaps between the hermetical container 1 and the rotational motor formed on the outer periphery of the stator 11 , and through a gap 18 (air gap) between the stator 11 and the rotor 12 , and flows into the upper space 19 of the rotational motor.
- the working fluid is separated from the refrigeration oil in the upper space 19 , and is discharged from the discharge pipe 14 .
- the working fluid which flowed into the outer space 19 b of the thin cylinder 41 through the notches 11 a of the stator 11 passes through the gap 44 between the upper end 41 b of the thin cylinder 41 and the upper end surface 1 a in the hermetical container 1 , and flows into the inner space 19 a of the thin cylinder 41 .
- the working fluid in the inner space 19 a of the thin cylinder 41 is drawn into the suction port 40 a located below the gap 44 , and is discharged into the outside refrigeration cycle. Since the rotor 12 rotates at high speed in the inner space 19 a of the thin cylinder 41 , a turning flow around the rotation center axis L is generated in the working fluid in the inner space 19 a of the thin cylinder 41 .
- the thin cylinder 41 is fitted over the coil end 11 b and the upper space 19 of the rotational motor is divided into the inner space 19 a and the outer space 19 b of the thin cylinder 41 . Therefore, it is possible to limit the flow path of the working fluid which flowed into the upper space 19 through the notches 11 a of the stator 11 .
- the thin cylinder 41 which divides the upper space 19 into the inner space 19 a and the outer space 19 b, it is possible to prevent the turning flow of the inner space 19 a of the thin cylinder 41 from being dispersed to the outer space 19 b of the thin cylinder 41 . Thus, attenuation of rotational motion energy is suppressed.
- the gap 44 is provided between the upper end 41 b of the thin cylinder 41 and the upper end surface 1 a in the hermetical container 1 , the working fluid which passed through the notches 11 a of the stator 11 and which includes oil mist flows upward to the vicinity of the upper end of the hermetical container 1 through the outer space 19 b and then, passes through the gap 44 and flows into the inner space 19 a of the thin cylinder 41 .
- the gap 44 is formed immediately below the upper end surface 1 a in the hermetical container 1 and the inner space 19 a of the thin cylinder 41 spreads below the gap 44 .
- the working fluid which flowed into the inner space 19 a of the thin cylinder 41 forms a flow having downward flow velocity component while enlarging the flow width.
- the oil mist mixed into the working fluid which flows downward receives downward flow velocity component from the peripheral working fluid. Since the oil mist has higher density than the working fluid and gravity acting on the refrigeration oil is greater than gravity acting on the working fluid, the oil mist has greater downward velocity component than the working fluid. Thus, the oil mist flows downward of the working fluid and is separated from the working fluid. That is, since the working fluid flows into the inner space 19 a of the thin cylinder 41 through the gap 44 between the upper end 41 b of the thin cylinder 41 and the upper end surface 1 a in the hermetical container 1 , the oil mist is separated from the working fluid.
- the suction port 40 a of the discharge pipe 40 since the discharge pipe 40 passes through the hermetical container 1 and the suction port 40 a of the discharge pipe 40 is located lower than the gap 44 at the inner space 19 a of the thin cylinder 41 , the working fluid flowing into the inner space 19 a from the gap 44 flows more downward toward the suction port 40 a.
- the oil mist receives strong downward external force from the working fluid, and the oil mist is prone to be separated from the working fluid.
- the suction port 40 a of the discharge pipe 40 opens diagonally downward, and the flowing direction of the working fluid drawn into the suction port 40 a is abruptly changed from downward to upward.
- the oil mist which is attracted by the suction port 40 a and flows downward has higher density and greater inertial force than the working fluid.
- the working fluid having lower density and smaller inertial force than the refrigeration oil is drawing into the suction port 40 a.
- the working fluid and the oil mist are separated from each other.
- the turning flow is generated in viscosity in the vicinity of the upper surface 12 b of the rotor 12 .
- the working fluid in the inner space 19 a of the thin cylinder 41 reaches the vicinity of the upper surface 12 b of the rotor 12 by a shearing force received from the turning flow, the flow velocity component in the rotational direction is increased.
- a region which receives heat exchanger influence of the turning flow is increased to the inner side surface of the thin cylinder 41 fitted over the coil end 11 b and thus, the flow velocity in the rotational direction of the working fluid is abruptly reduced.
- the inner side surface of the thin cylinder 41 is cylindrical in shape, the loss of the flow velocity in the rotational direction of the working fluid given by the inner side surface of the thin cylinder 41 higher than the upper end surface 11 c of the coil end 11 b becomes extremely small.
- Oil mist which is not attached to the inner side surface of the thin cylinder 41 and is not drawn into the suction port 40 a of the discharge pipe 40 has higher density than the working fluid in a lower portion of the suction port 40 a of the discharge pipe 40 , the oil mist reaches nearer to the upper surface 12 b of the rotor 12 than the working fluid.
- the thin cylinder 41 Since the thin cylinder 41 is fixed to the outer side of the coil end 11 b, oil mist which received greater turning flow velocity and greater centrifugal force in the vicinity of the upper surface 12 b of the rotor 12 attaches to the coil end 11 b which comprises a plurality of copper wires and provided at its surface with complicated bumps and dips. Therefore, the oil mist is prone to grow into the liquid drop and the oil mist is separated from the working fluid easily.
- the refrigeration oil which grew into the liquid drop from the fog drip and which was separated from the working fluid passes through the gap 18 between the stator 11 and the rotor 12 by the gravity, and is returned into the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid having smaller centrifugal force caused by turning flow than the refrigeration oil and collected to the center of the inner space 19 a of the thin cylinder 41 is introduced into the suction port 40 a of the discharge pipe 40 in a state where the refrigeration oil is separated from the working fluid.
- an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- the thin cylinder 41 is fitted over the coil end 11 b, the gap is provided between the upper end of the thin cylinder 41 and the upper end surface in the hermetical container 1 , and the discharge pipe 40 is extended and its suction port 40 a is located inside the thin cylinder 41 . Therefore, the effect of this embodiment can easily be obtained only by slightly changing the conventional compressor, and the compressor is extremely inexpensive.
- FIG. 12 is a vertical sectional view of a compressor according to the eighth embodiment of the invention.
- the compressor according to the eighth embodiment of the present invention has the same structure as that of the compressor of the seventh embodiment as shown in FIGS. 10 and 11 except the thin cylinder.
- the same elements are designated with the same symbols. Explanation of the same structure and effect as those of the seventh embodiment will be omitted.
- a thin cylinder 42 as a dividing member is fitted into the coil end 11 b on the upper end of the stator 11 , and the upper space 19 of the rotational motor is divided by the thin cylinder 42 into the inner space 19 a and the outer space 19 b.
- An inner diameter of an inner side surface of the thin cylinder 42 is reduced from its lower end toward the upper end.
- a gap 44 is provided between the upper end 42 b of the thin cylinder 42 and the upper end surface 1 a in the hermetical container 1 .
- the rotational motion energy caused by shrinkage fit is given to the working fluid in the inner space 19 a of the thin cylinder 42 by a turning flow generated in the vicinity of the upper surface 12 b of the rotor 12 , and the turning flow is generated in the working fluid.
- a region of the inner space 19 a is reduced as compared with a case in which the thin cylinder 42 is fitted over the coil end 11 b and thus, the dispersion of the rotational motion energy is suppressed.
- the turning flow velocity of the inner space 19 a of the thin cylinder 42 is increased as a whole.
- the working fluid which flowed into the inner space 19 a from the gap 44 of the upper end 42 b of the thin cylinder 42 receives stronger centrifugal force than the seventh embodiment. Therefore, oil mist is prone to attach to the inner side surface of the thin cylinder 42 due to a difference in centrifugal force caused by difference in density between the working fluid and the refrigeration oil, the growth of the oil mist into the liquid drop is facilitated, and the refrigeration oil is separated from the working fluid easily.
- the inner diameter of the inner side surface of the thin cylinder 42 can further be reduced from its lower end toward its upper ends as compared with the compressor of the seventh embodiment.
- the component of force perpendicular to the inner side surface of the thin cylinder 42 of the centrifugal force applied to the liquid drop of the refrigeration oil attached to the inner side surface of the thin cylinder 42 is brought into balance with the reaction force from the inner side surface of the thin cylinder 42 , and there remains a component of force which is parallel to the inner side surface of the thin cylinder 42 of the centrifugal force applied to the liquid drop of the refrigeration oil attached to the inner side surface of the thin cylinder 42 .
- the eighth embodiment can obtain the effect of the seventh embodiment of course.
- an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- FIG. 13 is a vertical sectional view of a compressor according to the ninth embodiment of the invention.
- the compressor according to the eighth embodiment of the present invention has the same structure as that of the compressor of the seventh embodiment as shown in FIGS. 10 and 11 except the thin cylinder.
- the same elements are designated with the same symbols. Explanation of the same structure and effect as those of the seventh embodiment will be omitted.
- a thin cylinder 43 as a dividing member is fitted into the coil end 11 b on the upper end of the stator 11 , and the upper space 19 of the rotational motor is divided by the thin cylinder 43 into the inner space 19 a and the outer space 19 b.
- an upper end of the thin cylinder 43 is brought into contact with the upper end surface 1 a in the hermetical container 1 and fixed thereto.
- a plurality of communication holes 45 are formed in the upper portion of the thin cylinder 43 as flow paths for working fluid which brings the inner space 19 a and the outer space 19 b into communication with each other.
- a flange 43 a extending inside the thin cylinder 43 from a lower inner side surface of the thin cylinder 43 is provided in the vicinity of the upper surface 12 b of the rotor 12 .
- the inner space 19 a of the thin cylinder 43 is divided by the flange 43 a into an upper space 19 a ′ and a lower space 19 c.
- a flow path 46 which brings the upper space 19 a ′ and the lower space 19 c into communication with each other is formed in a center of the flange 43 a.
- the inner space 19 a and the outer space 19 b divided by the thin cylinder 43 are in communication with each other through the plurality of communication holes 45 formed in the upper portion of the thin cylinder 43 , the upper end of the thin cylinder 43 can be brought into contact with the upper end surface 1 a in the hermetical container 1 and fixed thereto. Therefore, the positioning precision of the dividing member in the vertical direction when the compressor is assembled is enhanced irrespective of the installation place of the dividing member inside or outside the coil end. If the thin cylinder is provided outside the coil end, the possibility of contact with the thin cylinder and the rotor which rotates at high speed is lowered, damage caused by contact between the thin cylinder and the rotor is prevented, and a compressor having high reliability can be provided.
- the flange 43 a extending toward the rotation center axis L is provided on the inner periphery of the thin cylinder 43 , the inner space 19 a of the thin cylinder 43 is divided by the flange 43 a into the upper space 19 a ′ and the lower space 19 c, and the flow path 46 for bringing the upper space 19 a ′ and the lower space 19 c into communication with each other is formed in the center of the flange 43 a. Therefore, in the lower space 19 c of the thin cylinder 43 , strong centrifugal force acting outwardly from the rotation center axis L is applied to the working fluid which receives the rotational motion energy by viscosity from the upper surface 12 b of the rotational rotor 12 .
- the working fluid on which the strong centrifugal force acts flows in the radial direction toward the inner side surface of the thin cylinder 43 through the lower space 19 c between the flange 43 a and the upper surface 12 b of the rotor 12 , and flows downwardly through the gap 18 between the rotor 12 and the stator 11 along a corner formed between the flange 43 a and the inner side surface of the thin cylinder 43 .
- the thin cylinder 43 is fitted into the coil end 11 b and the working fluid is allowed to flow into the inner space 19 a of the thin cylinder 43 from the upper portion of the thin cylinder 43 , fog drip and liquid drop of the refrigeration oil separated from the working fluid and collected into the lower portion of the upper space 19 a ′ of the flange 43 a are forcibly returned into the oil reservoir 16 formed in the bottom of the hermetical container 1 from the flow path 46 of the flange 43 a through the the lower space 19 c and the gap 18 between the rotor 12 and the stator 11 .
- the flange 43 a is formed on the inner periphery of the thin cylinder 43 , it is possible to independently provide the flange on the inner periphery of the upper end coil end (this structure is not shown). By the same effect as that of this embodiment, it is possible to forcibly return the fog drip and liquid drop of the refrigeration oil in the vicinity of the flange into the oil reservoir from the lower space formed by the flange.
- the ninth embodiment can obtain the effect of the seventh and eighth embodiments of course.
- an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced.
- the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated.
- An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- the working fluid in the hermetical container 1 is brought into the supercritical state using working fluid comprising environment-friendly carbon dioxide, and the meltage of the refrigeration oil with respect to the working fluid is increased.
- the oil-separating effect is enhanced by effect of the thin cylinder 41 and the like.
- FIG. 14 is a vertical sectional view of a compressor according to a tenth embodiment of the invention
- FIG. 15 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows X-X
- FIG. 16 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows Y-Y
- FIG. 17 is a lateral sectional view of the compressor shown in FIG. 14 taken along arrows Z-Z.
- the compressor according to the tenth embodiment of the present invention has almost the same structure as that of the conventional compressor. The same elements are designated with the same symbols.
- the compressor of this embodiment comprises the hermetical container 1 , the compression mechanism disposed in a lower portion in the hermetical container 1 , and the rotational motor disposed in an upper portion in the hermetical container 1 .
- the compression mechanism comprises the shaft 2 capable of rotational around the rotation center axis L, the cylinder 3 having the cylindrical surface 3 a therein, the roller 4 fitted over the eccentric portion 2 a of the shaft 2 and eccentrically rotational inside the cylinder 3 with the rotation of the shaft 2 , the vane 7 which reciprocates within the vane groove 3 b of the cylinder 3 while a tip end of the vane 7 being in contact with the roller 4 and which divides a space defined by the cylinder 3 and the roller 4 into the suction chamber 5 and the compression chamber 6 , the spring 8 which is disposed on a back surface of the vane 7 and which pushes the vane 7 against the roller 4 , and the upper bearing 9 and a lower bearing 10 which support the shaft 2 .
- the upper bearing 9 includes a flow path 9 a which is connected to the suction pipe 15 and which introduces working fluid drawing from the suction pipe 15 into the suction chamber 5 , and the discharging hole 9 b which discharges working fluid compressed in the compression chamber 6 into the lower space 17 of the rotational motor.
- the rotational motor comprises the stator 11 shrinkage fitted into the hermetical container 1 , and the rotor 12 which is shrinkage fitted to the shaft 2 and rotates in the inner periphery of the stator 11 .
- the stator 11 is provided at its upper end with the coil end 11 b and at its lower end with the coil end 11 d.
- the stator 11 is provided at its outer periphery with a plurality of notches 11 a which bring the lower space 17 and the upper space 19 into communication with each other.
- the notches 11 a serve as flow paths for working fluid.
- Refrigeration oil is reserved in the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the hermetical container 1 comprises three elements, i.e., an upper shell 50 , a barrel shell 51 and a lower shell 52 .
- the hermetical container 1 is formed by welding.
- An introducing terminal 54 for energizing the rotational motor in the hermetical container 1 is disposed in the center of the upper shell 50 .
- a columnar cluster 55 is mounted on the introducing terminal 54 in the hermetical container 1 such that a mounting gap is not substantially generated, and the stator 11 of the rotational motor is energized through the lead wire 25 .
- This columnar cluster 55 is provided in the upper central portion of the hermetical container such that a center axis of the cluster 55 substantially coincides with the rotation center axis L of the rotational motor.
- An outer diameter of the cluster 55 is smaller than an inner diameter of the coil end 11 b on the upper end of the stator 11 .
- a discharge pipe 53 is provided on a side surface of an upper portion of the hermetical container 1 (upper shell 50 ) for introducing the working fluid into the refrigeration cycle outside the hermetical container 1 from the upper space 19 in the hermetical container 1 .
- the discharge pipe 53 passes through the hermetical container 1 from a side surface of the upper shell 50 .
- the discharge pipe 53 is formed at a lower position than a lower surface of the cluster 55 .
- a suction port 53 a of the discharge pipe 53 as an open end into the hermetical container projects from an inner wall surface of the hermetical container 1 .
- a carbon dioxide refrigerant which is a natural refrigerant is used as the working fluid.
- the through holes 12 a (see FIG. 8 ) of the rotor 12 by the same oil-separating plate method as that of the conventional technique is not provided.
- the working fluid is introduced from the suction pipe 15 into the suction chamber 5 through the flow path 9 a provided in the upper bearing 9 . If the rotational motor is energized and the shaft 2 which is integral with the rotor 12 is rotated, the roller 4 eccentrically rotates, the capacities of the suction chamber 5 and the compression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharging hole 9 b is opened, oil mist which is supplied from the oil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into the lower space 17 of the rotational motor.
- the working fluid in the lower space 17 passes through notches 11 a formed in the outer periphery of the stator 11 as gaps between the rotational motor and the hermetical container 1 , and through a gap 18 (air gap) between the stator 11 and the rotor 12 , and flows into the upper space 19 of the rotational motor.
- the working fluid is separated from the refrigeration oil in the upper space 19 , and is discharged from the discharge pipe 14 .
- the working fluid including the oil mist passing through the notches 11 a of the stator 11 flows into the upper space 19 of the rotational motor along a wall surface of the hermetical container 1 (barrel shell 51 and the upper shell 50 ) and then, the working fluid flows downward toward the inner space of the coil end 11 b along a side surface of the cluster 55 disposed in the center of the upper shell 50 .
- the rotor 12 of the rotational motor Since the rotor 12 of the rotational motor is rotational at high speed, a shearing force caused by the upper surface 12 b of the rotor 12 is applied to the downward flow of the working fluid, and turning flow around the rotation center axis L of the rotor 12 is generated.
- the cluster 55 is columnar in shape which is symmetric with respect to the rotation center axis L, the turning flow around the cluster 55 is further prone to be generated, and the flow velocity of the turning flow is uniformly increased. Therefore, the working fluid and the refrigeration oil are separated by a centrifugal force caused by a difference in density therebetween, the oil mist moves toward the outer peripheral portion of the turning flow, and attaches to the inner wall surface of the upper shell 50 and becomes oil drop. The oil drop drops downward and is returned into the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid which flowed to the inner space of the coil end 11 b on the upper end of the stator 11 and which includes the oil mist turns and flows in the inner space of the coil end 11 b, and the oil mist is separated from the working fluid by the centrifugal force, the oil mist attaches to the inner peripheral surface of the coil end 11 b and becomes oil drop and drops downward, and the oil drop is returned to the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid from which the oil mist is separated flows around a region close to the center of the turning flow which is away from an inner wall surface of the hermetical container 1 . Since the suction port 53 a projects from the inner wall surface of the hermetical container 1 and the suction port 53 a is inserted into this region in this embodiment, most of refrigeration oil is separated from the working fluid which flowed into the discharge pipe 53 and discharged from the compressor.
- the discharge pipe 53 is lower than the lower surface of the cluster 55 , the flow of the working fluid flowing into the upper space 19 is shut off by the side surface of the cluster 55 , and the working fluid does not flow into the suction port 53 a of the discharge pipe 53 directly. Further, since the cluster 55 is disposed in the introducing terminal 54 such that a mounting gap is not generated and thus, the working fluid which flowed into the upper space 19 does not pass through the mounting gap between the cluster 55 and the introducing terminal 54 . Therefore, the turning flow is not disturbed.
- the hermetical container 1 is divided into the upper shell 50 , the barrel shell 51 and the lower shell 52 . Therefore, the discharge pipe 53 and the introducing terminal 54 can be bonded to the upper shell 50 previously, or the compression mechanism and the rotational motor can be fitted to the barrel shell 51 . Therefore, the assembling operation of the compressor is facilitated.
- the outer diameter of the cluster 55 is set smaller than the inner diameter of the coil end 11 b. Therefore, there is effect that a space for flowing is increased, and the turning flow of the inner space of the coil end 11 b can easily be developed into turning flow around the cluster 55 .
- an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced extremely. Therefore, the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- a carbon dioxide refrigerant which is a natural refrigerant having lower worming coefficient. If the carbon dioxide refrigerant is used as the working fluid, a pressure of the compressed working fluid becomes extremely high, a mixing rate of the refrigeration oil into the working fluid is increased, and it becomes difficult to separate the oil from the working fluid.
- a pressure of the compressed working fluid becomes extremely high, a mixing rate of the refrigeration oil into the working fluid is increased, and it becomes difficult to separate the oil from the working fluid.
- the radial gap between the cluster 55 and the upper shell 50 of the hermetical container 1 is equal to or smaller than the outer diameter of the cluster 55 , the turning flow around the cluster 55 can further be accelerated and thus, the oil-separating efficiency can be enhanced.
- the outer diameter of the columnar cluster 55 is 28 mm and the inner diameter of the upper shell 50 is about 84 mm or less, it is possible to remarkably reduce the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor.
- the flow velocity of the turning flow is increased as the inner diameter of the hermetical container 1 is smaller.
- the oil-separating effect by the turning flow becomes higher.
- the oil-separating effect can be enhanced only by forming the cluster 55 into the columnar shape and by allowing the discharge pipe 53 to pass through the side surface of the upper shell 50 . Therefore, the tenth embodiment can easily be applied to the compressor with the hermetical container 1 having the outer diameter as extremely small as about 80 mm or less.
- the discharge pipe 53 passes through the side surface of the upper shell 50 in the compressor of the tenth embodiment. If the height of the upper shell 50 is reduced and the height of the barrel shell 51 is increased, the discharge pipe 53 can pass through the side surface of the barrel shell 51 , and the same effect can be obtained also in this structure (not shown).
- a compressor of the eleventh embodiment is the same as the compressor of the tenth embodiment shown in FIGS. 14, 15 and 16 .
- a vertical sectional view of the compressor of the eleventh embodiment is the same as that shown in FIG. 14 .
- FIG. 18 is a lateral sectional view of a compressor according to the eleventh embodiment of the invention taken along arrows Z-Z in FIG. 14 .
- the same elements are designated with the same symbols. Explanation of the same structure and effect as those of the tenth embodiment will be omitted.
- the eleventh embodiment is the same as the tenth embodiment except a discharge pipe 63 , an introducing terminal 64 , and a hexagonal columnar cluster 65 mounted on the introducing terminal 64 .
- the hexagonal columnar cluster 65 is mounted on the introducing terminal 64 disposed in the center of the upper shell 50 such that almost no mounting gap is generated, and the stator 11 of the rotational motor is energized through the lead wire 25 .
- the cluster 65 is provided in an upper central portion in the hermetical container 1 such that a center axis of the cluster 65 substantially coincides with the rotation center axis L of the rotational motor.
- a side surface 65 a of the hexagonal columnar cluster 65 is opposed to the notches 11 a formed in the stator 11 .
- An outer diameter of the hexagonal columnar cluster 65 is smaller than an inner diameter of the coil end 11 b on the upper end of the stator 11 .
- the discharge pipe 63 pass through a side surface of the upper shell 50 and extends into the hermetical container 1 , and the discharge pipe 63 is located lower than a lower surface of the cluster 65 .
- a suction port 63 a of the discharge pipe 63 as an open end in the hermetical container projects from an inner wall surface of the hermetical container 1 .
- a hydrocarbon refrigerant which is a natural refrigerant is used as the working fluid.
- the oil-separating operation will be explained.
- the working fluid including oil mist discharged from the compression mechanism into the lower space 17 of the rotational motor passes through the notches 11 a of the stator 11 and the gap 18 between the stator 11 and the rotor 12 , and moves into the upper space 19 of the rotational motor.
- the gap 18 is extremely narrow, the rate of working fluid passing through the notches 11 a of the stator 11 becomes extremely large.
- the working fluid including the oil mist passing through the notches 11 a of the stator 11 flows into the upper space 19 of the rotational motor along a wall surface of the hermetical container 1 (barrel shell 51 and the upper shell 50 ). Thereafter, the side surface 65 a of the cluster 65 disposed in the central portion of the upper shell 50 becomes an obstruction, and a downward flow toward the inner space of the coil end 11 b along the side surface 65 a is generated. At that time, the side surface 65 a of the cluster 65 is opposed to the flow of the working fluid which flows from the notches 11 a of the stator 11 and which includes the oil mist.
- the side surface 65 a of the cluster 65 is flat as compared with the tenth embodiment, especially the downward flow having no component in the circumferential direction toward the inner space of the coil end 11 b is accelerated. Especially the polygonal side surface becomes an obstruction, and the effect for dropping the oil mist downward as the oil drop is enhanced.
- the rotor 12 of the rotational motor Since the rotor 12 of the rotational motor is rotational at high speed, a shearing force caused by the upper surface 12 b of the rotor 12 is applied to the downward flow of the working fluid, and turning flow around the rotation center axis L is generated.
- the cluster 65 is hexagonal columnar in shape which is symmetric wither respect to the rotation center axis L, the turning flow around the cluster 65 is further prone to be generated without being hindered, and the flow velocity of the turning flow is uniformly increased. Therefore, the working fluid and the refrigeration oil are separated by a centrifugal force caused by a difference in density therebetween, the oil mist moves toward the outer peripheral portion of the turning flow, and attaches to the inner wall surface of the upper shell 50 and becomes oil drop. The oil drop drops downward and is returned into the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid which flowed to the inner space of the coil end 11 b on the upper end of the stator 11 and which includes the oil mist turns and flows in the inner space of the coil end 11 b, and the oil mist is separated from the working fluid by the centrifugal force, the oil mist attaches to the inner peripheral surface of the coil end 11 b and becomes oil drop and drops downward, and the oil drop is returned to the oil reservoir 16 formed in the bottom of the hermetical container 1 .
- the working fluid from which the oil mist is separated flows around a region close to the center of the turning flow which is away from an inner wall surface of the hermetical container 1 . Since the suction port 63 a projects from the inner wall surface of the hermetical container 1 and the suction port 63 a is inserted into this region in this embodiment, most of refrigeration oil is separated from the working fluid which flowed into the discharge pipe 63 and discharged from the compressor.
- the discharge pipe 63 is lower than the lower surface of the cluster 65 , the flow of the working fluid flowing into the upper space 19 is shut off by the side surface of the cluster 65 , and the working fluid does not flow into the suction port 63 a of the discharge pipe 63 directly. Further, since the cluster 65 is disposed in the introducing terminal 64 such that a mounting gap is not generated and thus, the working fluid which flowed into the upper space 19 does not pass through the mounting gap between the cluster 65 and the introducing terminal 64 . Therefore, the turning flow is not disturbed.
- the hermetical container 1 is divided into three. Therefore, the discharge pipe 63 and the introducing terminal 64 can be bonded to the upper shell 50 previously, or the compression mechanism and the rotational motor can be fitted to the barrel shell 51 . Therefore, the assembling operation of the compressor is facilitated.
- the outer diameter of the cluster 65 is set smaller than the inner diameter of the coil end 11 b. Therefore, there is effect that the inner space of the coil end 11 b is increased, and the turning flow of the inner space can easily be developed into turning flow around the cluster 65 .
- an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced extremely. Therefore, the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor.
- a hydrocarbon refrigerant which is a natural refrigerant having lower worming coefficient. If the hydrocarbon refrigerant is used as the working fluid, it is necessary to take the combustible nature of the refrigerant into consideration and to reduce the amount of refrigerant to be charged into the refrigeration cycle for enhancing the safety, and it is required to reduce the compressor in size. According to this embodiment, the oil-separating efficiency can be enhanced only by forming the cluster 65 into the hexagonal columnar shape and by allowing the discharge pipe 63 to pass through the side surface of the upper shell 50 .
- This embodiment can easily be applied to the compressor with the hermetical container 1 having the outer diameter as extremely small as about 80 mm or less.
- the compressor is small in size using combustible hydrocarbon refrigerant, it is possible to easily reduce the amount of oil to be discharged.
- the amount of oil can easily be reduced only by slightly changing the cluster 65 and the discharge pipe 63 and thus, it is possible to provide an extremely inexpensive compressor.
- the cluster 65 has the regular hexagonal columnar shape in the eleventh embodiment, any shapes (not shown) other than the regular hexagonal columnar can also be employed, and the same effect can be obtained only if the cluster is symmetric with respect to the center axis of the cluster, and the center axis of the cluster substantially coincides with the rotation center axis L of the rotational motor (i.e., rotor 12 ).
- the compressor of this invention is used for a refrigeration cycle such as a refrigerator-freezer or an air conditioner.
- Carbon dioxide is preferably used as the working fluid.
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Abstract
Description
- The present invention relates to a compressor used for a refrigerator-freezer, an air conditioner and the like.
- A hermetical type rotary compressor is widely used for a refrigerator-freezer, an air conditioners and the like because it is small in size and its structure is simple. A structure of the hermetical type rotary compressor such as a rotary compressor and a scroll compressor is described in a
non-patent document 1. The structure of the hermetical type rotary compressor will be explained with reference toFIGS. 19 and 20 based on a rotary compressor (compressor, hereinafter).FIG. 19 is a vertical sectional view of a conventional compressor. - The compressor shown in the drawings comprises a
hermetical container 1, ashaft 2 having aneccentric portion 2 a, acylinder 3, aroller 4, avane 7, aspring 8, an upper bearing 9 and alower bearing 10. The compressor also comprises a compression mechanism disposed in a lower portion of thehermetical container 1, and a rotational motor having astator 11 and arotor 12. Thestator 11 is provided at its upper end lower ends withcoil ends hermetical container 1. - A plurality of
notches 11 a are formed in an outer periphery of thestator 11. Thenotches 11 a serve as flow paths for working fluid. - The
hermetical container 1 is provided at its upper portion with an introducingterminal 13 which energizing a rotational motor in thehermetical container 1, and adischarge pipe 14 for introducing working fluid from thehermetical container 1 into a refrigeration cycle. Thedischarge pipe 14 is in communication with inside thehermetical container 1. Thedischarge pipe 14 is located above theupper coil end 11 b of thestator 11 so that asuction port 14 a of thedischarge pipe 14 does not come into contact with thestator 11 and therotor 12 of the rotational motor. Thehermetical container 1 is provided at its side surface with asuction pipe 15 for introducing working fluid from the refrigeration cycle into the compressor. Refrigeration oil is reserved in anoil reservoir 16 formed in a bottom of thehermetical container 1. Acluster 26 is mounted on the introducingterminal 13, alead wire 25 from thestator 11 of the rotational motor is connected to thecluster 26 so that current is supplied to the rotational motor from the introducingterminal 13. - The operation of the compressor will be explained. If the rotational motor of the compressor is energized to rotate the
rotor 12, theroller 4 rotates eccentrically by theeccentric portion 2 a, and capacities of the compressor (not shown) and asuction chamber 5 formed in thecylinder 3 are varied. With this eccentric rotation, the working fluid is drawn into thesuction chamber 5, and compressed in a compression chamber. The compressed working fluid is mixed with fog drip (oil mist, hereinafter) of refrigeration oil which is supplied from theoil reservoir 16 and lubricates the compression mechanism. This mixture is discharged into alower space 17 of the rotational motor through thedischarging hole 9 b, and passes through thenotches 11 a of thestator 11 and agap 18 between thestator 11 and therotor 12, and flows into anupper space 19 of the rotational motor. - The working fluid is discharged out from the
discharge pipe 14, but the refrigeration oil mixed with the working fluid is also discharged at the same time. Therefore,in the conventional compressor, in order to enhance the reliability of the compressor and the efficiency of the refrigeration cycle, the oil is separated from the working fluid to prevent the refrigeration oil from being discharged out from thehermetical container 1. - To separate the refrigeration oil from the working fluid, there is a method to use an oil-separating plate provided on an upper portion of the
rotor 12 as disclosed in apatent document 1.FIG. 21 is a detailed sectional view of peripheries of the oil-separating plate. Therotor 12 includes anupper end plate 21 a and alower end plate 21 b for closing an insertion hole of apermanent magnet 20. A plurality of throughholes 12 a formed in therotor 12 in the vertical direction and an oil-separatingplate 23 disposed above exits of thethrough holes 12 a are fixed to therotor 12 by afixing member 24. The oil-separatingplate 23 forms an oil-separatingspace 22 between an upper surface of therotor 12 and the oil-separatingplate 23. - In the compressor having such a structure, a portion of working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor flows into the oil-separatingspace 22 through the throughholes 12 a. The working fluid is radially discharged from an outer peripheral exit of the oil-separatingplate 23 by a centrifugal force, and the working fluid is sprayed on thecoil end 11 b of thestator 11, and the working fluid and the oil mist included therein are separated from each other. Only the working fluid from which the oil is separated flows upward and is discharged out from thedischarge pipe 14 provided in the upper portion in thehermetical container 1. The refrigeration oil attached to thecoil end 11 b of thestator 11 drops downward and is returned into theoil reservoir 16 formed in the bottom of thehermetical container 1. - (Non-Patent Document 1)
- “Air-Conditioning and Refrigeration handbook”,
new edition 5,volume 11, machine”, Air-Conditioning and Refrigeration Institute, 1993, paragraphs 30 to 43 - (Patent Document 1)
- Japanese Patent Application Laid-open No. H8-28476 (
paragraph 6, FIGS. 1 to 3) - In the conventional compressor, a working fluid flows from the
lower space 17 of the rotational motor to theupper space 19 through thenotches 11 a formed in the outer periphery of thestator 11 and thegap 18 between thestator 11 and therotor 12. In the case of the compressor shown inFIG. 21 , the working fluid passes through the throughholes 12 a of therotor 12. Thegap 18 between thestator 11 and therotor 12 is as narrow as 0.5 mm to enhance the efficiency of the rotational motor. Thus, a rate of the working fluid flowing through the gap is extremely small. Concerning the throughholes 12 a of therotor 12 also, if a cross-sectional area of a laminated core of therotor 12 is reduced and a magnetic circuit becomes narrow, the efficiency of the rotational motor is deteriorated and thus, the throughholes 12 a can not be increased in size. Thus, the rate of the working fluid passing through thenotches 11 a of thestator 11 is extremely increased. - In the conventional compressor having the structure shown in
FIG. 21 , only oil can be separated from the working fluid passing through the plurality of throughholes 12 a formed in therotor 12 in the vertical direction, and it is difficult to separate oil from working fluid having high flow rate and passing through thenotches 11 a formed in the outer periphery of thestator 11. - As shown in
FIGS. 19 and 20 , thecluster 26 disposed in theupper space 19 is a thin and long rectangular solid and is eccentric from the axial center of thehermetical container 1. Therefore, there is generated a force which hinders a turning flow around a rotation center axis L in theupper space 19 caused by rotation of therotor 12. Therefore, the flow velocity of turning flow is slow and uneven. Thus, the working fluid and the refrigeration oil are not separated from each other sufficiently. - When the conventional compressor using a working fluid mainly comprising carbon dioxide is applied to a refrigeration cycle, since a pressure of the working fluid discharged from the
compression chamber 6 exceeds a critical pressure, the working fluid in thehermetical container 1 is brought into a supercritical state, meltage of the refrigeration oil with respect to the working fluid is increased, and it is difficult to separate oil in thehermetical container 1. - The present invention has been accomplished to solve the above problems, and it is an object of the invention to obtain a refrigeration cycle having high efficiency by easily and inexpensively enhancing the oil-separating efficiency to reduce an amount of refrigeration oil which is taken out from a hermetical container and to enhance the reliability of the compressor without deteriorating the efficiency of a rotational motor.
- A first aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container: a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; and a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; wherein the working fluid is discharged from said container through said discharge pipe; and wherein said discharge pipe has an open end in said container, the open end being located inside said coil end provided on the upper end of said stator.
- According to this aspect, since the open end in the hermetical container is located inside the coil end, the working fluid introduced into the upper space of the container from the gap between the rotational motor and the container flows from upward to downward toward the inside of the coil end, and the working fluid introduced into the coil end flows toward the open end of the discharge pipe. Therefore, when the flowing direction of the working fluid is changed in this manner, the oil mist of the refrigeration oil having high density reaches closer to the rotor than the working fluid. The oil mist of the refrigeration oil which reaches the vicinity of the rotor is separated from the working fluid by centrifugal force by means of the rotational flow caused by rotation of the rotor, and attaches to the inner peripheral surface of the coil end. Thus, it is possible to prevent the refrigeration oil from being delivered outside of the hermetical container from the discharge pipe together with the working fluid.
- According to the second aspect of the invention, in the compressor of the first aspect said discharge pipe has a curved portion in said container.
- According to this aspect, it is possible to position the open end in the container inside the coil end irrespective of a position where the suction port is mounted on the container. Therefore, it is possible to largely enhancing the flexibility in design of the compressor.
- According to a third aspect of the invention, in the compressor of the second aspect, said discharge pipe is provided on a side surface of said container.
- With this aspect, since the discharge pipe passing through the side surface of the container has the curved portion in the hermetical container, the open end in the container can easily be located inside the coil end. Therefore, the oil is separated by the gravity caused by changing the flowing direction and by the centrifugal force of the turning flow, and it is possible to prevent the refrigeration oil from being delivered outside the container. Since the upper portion in the container can freely be used, the flexibility in design of the compressor can be enhanced.
- According to the fourth aspect of the invention, in the compressor of the first aspect, the open end of said discharge pipe in said container is disposed to face downstream of a rotational direction of said rotor.
- With this aspect, since the open end in the container is opened toward downstream of a rotational direction of the rotor, the oil mist of refrigeration oil having high density is prevented from being drawn into the discharge pipe, and the oil can be separated from the working fluid more efficiently.
- According to a fifth aspect of the invention, in the compressor of the first aspect, the open end of said discharge pipe in said container is located in a vicinity of a rotation center axis of said rotor.
- With this aspect, since the open end in the container is located in the vicinity of the rotation center axis of the rotor, working fluid from which the oil mist is sufficiently separated can be introduced into the discharge pipe.
- According to a sixth aspect of the invention, in the compressor of the first aspect, an inner diameter of the open end of said discharge pipe located inside said container is larger than an inner diameter of said discharge pipe located outside of said container.
- With this aspect, since an inner diameter of the open end in the container is increased, the flow velocity of the working fluid in the vicinity of the open end in the container is reduced, and the amount of oil mist drawn together with the working fluid can be reduced.
- A seventh aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container; a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; and a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; and a substantially cylindrical dividing member provided in the upper space of said container and being operable to divide the upper space into an inner space and an outer space; wherein said discharge pipe has an open end in said container, the open end being located inside said substantially cylindrical dividing member; and wherein the working fluid is discharged from said container through said discharge pipe.
- With this aspect, since the dividing member is provided, the turning flow of the working fluid generated by the rotor in the inner space is not dispersed to the outer space, the development of the turning flow is accelerated, and the oil is sufficiently separated by the centrifugal force caused by the turning flow. Thus, the oil mist can attach the inner wall surface of the dividing member reliably, and the oil mist can be returned into the oil reservoir as liquid drop. Therefore, it is possible to prevent the refrigeration oil from being discharged from the discharge pipe together with the working fluid.
- According to an eighth aspect of the invention, in the compressor of the seventh aspect, a gap is provided between an upper end of said dividing member and said container.
- With this aspect, a narrow gap is formed in the upper portion in the hermetical container. Since the working fluid which passed through the gap spreads and flows downward in the wider inner space, the oil mist having higher density than the working fluid which is largely affected by the gravity receives a great downward speed component, and the oil separation is facilitated.
- According to a ninth aspect of the invention, in the compressor of the seventh aspect, said dividing member is provided with a communication hole between the inner space and the outer space.
- With this aspect, since the dividing member is provided with the communication hole which brings the inner space and the outer space into communication with each other, the upper end of the dividing member can be brought into contact with the upper end surface in the container and fixed thereto, and the positioning precision of the dividing member when the compressor is assembled is enhanced.
- According to a tenth aspect of the invention, in the compressor of any of the seventh aspects, said dividing member is provided inside said coil end provided on the upper end of said stator.
- With this aspect, since the dividing member is provided inside, the region of the inner space is reduced, the dispersion of the rotational motion energy of the turning flow is suppressed, and the working fluid receives strong centrifugal force. Therefore, the oil mist separation effect by the centrifugal force is enhanced.
- According to an eleventh aspect of the invention, in the compressor of any of the seventh aspects, said dividing member is provided outside said coil end provided on the upper end of said stator.
- With this aspect, since the dividing member is provided outside, the coil end having complicated surface shape comes inside the dividing member. With this, the refrigeration oil attached to the surface of the coil end is prone to grow into the liquid drop, and the oil separation effect is enhanced.
- According to a twelfth aspect of the invention, in the compressor of any of the seventh aspects, an inner diameter of an upper portion of said dividing member is smaller than an inner diameter of a lower portion of said dividing member.
- With this aspect, a downward component of force of the centrifugal force which is in parallel to the inner wall surface of the dividing member is applied to the liquid drop of the refrigeration oil attached to the inner wall surface, which reliably allows the liquid drop to flow and drop downward along the inner wall surface, and the oil separation effect is enhanced.
- According to a thirteenth aspect of the invention, in the compressor of any of the first aspects, an upper portion of said container is domical in shape.
- With this aspect, since the working fluid is smoothly collected in the central portion from the outer periphery along the inner surface of the domical container, the flow velocity of the deviation flow is prevented from being lowered. With this the oil-separating effect by the gravity and the centrifugal force is further enhanced.
- A fourteenth aspect of the present invention provides a compressor comprising: a container; a compression mechanism disposed in a lower portion of said container; a rotational motor disposed in an upper portion of said container, said rotational motor having a stator and a rotor; a coil end provided on each of upper and lower ends of said stator; a discharge pipe provided on an upper end of said container; an oil reservoir provided in a lower portion of said container; a gap provided between said rotational motor and said container, said gap being operable to introduce working fluid, which is compressed by said compression mechanism, into an upper space of said container; an introduction terminal provided in said container and being operable to supply electricity to said rotational motor: and a cluster provided in said container and being adapted to connect a lead wire from said rotational motor to said introduction terminal; wherein said cluster is symmetric with respect to an axis thereof, the axis of said cluster being substantially coincident with a rotation central axis of said rotational motor: and wherein the working fluid is discharged from said container through said discharge pipe.
- With this aspect, the turning flow is generated in the upper space of the container by the high speed rotation of the rotational motor, but since the cluster is symmetric with respect to the axis and the cluster and the rotation center axis of the rotational motor substantially coincide with each other, the turning flow is also generated around the cluster. Therefore, the oil mist introduced into the upper space of the container together with the working fluid is separated by centrifugal force caused by the turning flow and the oil mist attaches to the inner wall surface of the hermetical container, and the oil mist flows and drops downward ad oil drop. Therefore, the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- According to a fifteenth aspect of the invention, in the compressor of any one of the first aspects, further comprising: an introduction terminal provided in said container and being operable to supply electricity to said rotational motor; and a cluster adapted to connect a lead wire from said rotational motor to said introduction terminal, wherein said cluster is symmetric with respect to a center axis thereof, the center axis being substantially coincident with a rotation center axis of said rotational motor.
- With this aspect, the turning flow is generated in the upper space of the container by the high speed rotation of the rotational motor, but since the cluster is symmetric with respect to the axis and the cluster and the rotation center axis of the rotational motor substantially coincide with each other, the turning flow is also generated around the cluster. Therefore, the oil mist introduced into the upper space of the container together with the working fluid is separated by centrifugal force caused by the turning flow and the oil mist attaches to the inner wall surface of the container, and the oil mist flows and drops downward ad oil drop. Therefore,the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- According to a sixteenth aspect of the invention, in the compressor of the fourteenth aspect, said cluster is columnar in shape.
- With this aspect, the generation effect of the turning flow around the cluster is enhanced.
- According to a seventeenth aspect of the invention, in the compressor of the fourteenth aspect, said cluster is polygonal columnar in shape.
- With this aspect, the side surface of the polygonal shape becomes an obstruction, and downward flow along the side surface is generated. Thus, the effect for downwardly dropping the oil mist as oil drop is enhanced, and the refrigeration oil is prevented from being discharged from the discharge pipe together with the working fluid.
- According to an eighteenth aspect of the invention, in the compressor of any of the fourteenth aspects, an outer diameter of said cluster is smaller than an inner diameter of said coil end.
- With this aspect, the space of flow is increased, the turning flow of space inside the coil end is prone to grow to the turning flow around the cluster.
- According to a nineteenth aspect of the invention, in the compressor of any of the first aspects, carbon dioxide is used as the working fluid.
- With this aspect, carbon dioxide can be used as the working fluid.
-
FIG. 1 is a vertical sectional view of a compressor according to a first embodiment of the present invention; -
FIG. 2 is a lateral sectional view of the compressor shown inFIG. 1 taken along arrows X-X; -
FIG. 3 is a vertical sectional view of a compressor according to a second embodiment of the invention; -
FIG. 4 is a lateral sectional view of the compressor shown inFIG. 3 taken along arrows Y-Y; -
FIG. 5 is a vertical sectional view of a compressor according to a third embodiment of the invention; -
FIG. 6 is a lateral sectional view of the compressor shown inFIG. 5 taken along arrows Z-Z; -
FIG. 7 is a vertical sectional view of a compressor according to a fourth embodiment of the invention; -
FIG. 8 is a vertical sectional view of a compressor according to a fifth embodiment of the invention; -
FIG. 9 is a vertical sectional view of a compressor according to a sixth embodiment of the invention; -
FIG. 10 is a vertical sectional view of a compressor according to a seventh embodiment of the invention; -
FIG. 11 is a lateral sectional view of the compressor shown inFIG. 10 taken along arrows X-X: -
FIG. 12 is a vertical sectional view of a compressor according to an eighth embodiment of the invention; -
FIG. 13 is a vertical sectional view of a compressor according to a ninth embodiment of the invention; -
FIG. 14 is a vertical sectional view of a compressor according to a tenth embodiment of the invention; -
FIG. 15 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows X-X; -
FIG. 16 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows Y-Y; -
FIG. 17 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows Z-Z; -
FIG. 18 is a lateral sectional view of a compressor according to an eleventh embodiment of the invention; -
FIG. 19 is a vertical sectional view of a conventional compressor; -
FIG. 20 is a perspective view of a cluster of the conventional compressor; and -
FIG. 21 is a detailed sectional view of peripheries of an oil-separating plate. - Several embodiments of the present invention will be explained below with reference to the drawings.
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FIG. 1 is a vertical sectional view of a compressor according to the first embodiment of the present invention, andFIG. 2 is a lateral sectional view of the compressor shown inFIG. 1 taken along arrows X-X. The compressor of the first embodiment of the invention has almost the same structure as that of the above-described conventional compressor, and the same elements are designated with the same symbols. - The compressor of this embodiment comprises a
hermetical container 1, a compression mechanism disposed in a lower portion in thehermetical container 1, and a rotational motor disposed above the compression mechanism. The compression mechanism comprises ashaft 2 which can rotate about a rotation center axis L, acylinder 3 having acylindrical surface 3 a therein, aroller 4 which is fitted over aneccentric portion 2 a of theshaft 2 and which eccentrically rotates in thecylinder 3 as theshaft 2 rotates, avane 7 which reciprocates in avane groove 3 b of thecylinder 3 while a tip end of thevane 7 being in contact with theroller 4 and which divides a space defined by thecylinder 3 and theroller 4 into asuction chamber 5 and acompression chamber 6, aspring 8 which is disposed on a back surface of thevane 7 and which pushes thevane 7 against theroller 4, and anupper bearing 9 and alower bearing 10 which support theshaft 2. Theupper bearing 9 includes aflow path 9 a which is connected to asuction pipe 15 and which introduces working fluid drawing from thesuction pipe 15 into thesuction chamber 5, and a discharginghole 9 b which discharges working fluid compressed in thecompression chamber 6 into thelower space 17 of the rotational motor. - The rotational motor comprises a
stator 11 shrinkage fitted into thehermetical container 1, and arotor 12 shrinkage fitted to theshaft 2. Thestator 11 is provided at its upper end with acoil end 11 b and at its lower end with a coil end lid. Thestator 11 is provided at its outer periphery with a plurality ofnotches 11 a which bring thelower space 17 and theupper space 19 into communication with each other. Thenotches 11 a serve as flow paths for working fluid. - The
hermetical container 1 is provided at its upper portion with an introducingterminal 13 which energizes the rotational motor in thehermetical container 1, and adischarge pipe 31 which introduces working fluid from theupper space 19 in thehermetical container 1 into a refrigeration cycle outside thehermetical container 1. Refrigeration oil is reserved in anoil reservoir 16 formed in a bottom of thehermetical container 1. - The
discharge pipe 31 is in communication with inside of thehermetical container 1. Asuction port 31 a as an open end of the hermetical container is located at inner side of anupper coil end 11 b of thestator 11, i.e., below anupper end surface 11 c of thecoil end 11 b. Thedischarge pipe 31 is a straight pipe, and is mounted on an upper portion of thehermetical container 1 at a location closer to a center than an inner diameter of thecoil end 11 b. Thus, the introducingterminal 13 is mounted at a position of the upper portion of thehermetical container 1 where the mounting of thedischarge pipe 31 is not hindered. In this embodiment, the throughholes 12 a (seeFIG. 11 ) of therotor 12 by the same oil-separating plate method as that of the conventional technique is not provided. - Next, the operation of the compressor having the above-described structure will be explained. The working fluid is introduced from the
suction pipe 15 into thesuction chamber 5 through theflow path 9 a provided in theupper bearing 9. If the rotational motor is energized and theshaft 2 which is integral with therotor 12 is rotated, theroller 4 eccentrically rotates, the capacities of thesuction chamber 5 and thecompression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharginghole 9 b is opened, oil mist which is supplied from theoil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into thelower space 17 of the rotational motor. The working fluid in thelower space 17 passes throughnotches 11 a formed in the outer periphery of thestator 11 as gaps between the rotational motor and thehermetical container 1, and through a gap 18 (air gap) between thestator 11 and therotor 12, and flows into theupper space 19 of the rotational motor. The working fluid is separated from the refrigeration oil in theupper space 19, and is discharged from thedischarge pipe 14. - This oil-separating operation will be explained. As described above, the working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thenotches 11 a of thestator 11 and thegap 18 between thestator 11 and therotor 12, and moves into theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid which passed through the
notches 11 a of thestator 11 flows upward to the vicinity of thecoil end 11 b of thestator 11 and then, flows toward a central portion of thehermetical container 1 through an upper portion of thecoil end 11 b. Thereafter, the working fluid flows downward toward thesuction port 31 a of thedischarge pipe 31 which is disposed inside thecoil end 11 b and directed downward. When the working fluid is drawn into thesuction port 31 a of thedischarge pipe 31, the working fluid again flows upward. At that time, the oil mist having high density drop downward due to gravity, and reaches closer to anupper surface 12 b of therotor 12 as compared with the working fluid. - Since the
upper surface 12 b of therotor 12 is rotational immediately below thesuction port 31 a of thedischarge pipe 31, the working fluid flows such as to turn due to the viscosity, and as closer to theupper surface 12 b of therotor 12, the turning flow velocity is increased. Therefore, the oil mist has higher density than the working fluid and the oil mist reaches a region where the flow velocity of the turning flow in the vicinity of theupper surface 12 b of therotor 12 is greater. Thus, the oil mist attaches to an inner peripheral surface of thestator 11 or thecoil end 11 b by the centrifugal force and becomes liquid drop and is returned to theoil reservoir 16 formed in the bottom of thehermetical container 1. In the state which the refrigeration oil is separated from the working fluid which is less affected by the turning flow, the working fluid is introduced into thesuction port 31 a of thedischarge pipe 31. - The
suction port 31 a is located inside thecoil end 11 b in this embodiment as described above. Therefore, when the working fluid flowing from thenotches 11 a toward thesuction port 31 a flows through theupper space 19 upward, downward and upward, the gravity acts on the oil mist, and when the working fluid entering into thecoil end 11 b and coming into contact with therotor 12 turns together with therotor 12 by the viscosity, the centrifugal force is applied to the oil mist and the refrigeration oil is separated from the working fluid. With this, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in theoil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. - Further, it is only necessary to extend the discharge pipe and to locate the suction port inside the coil end close to the upper end of the stator. Therefore, oil can be separated easily only with slight change, and it is possible to provide a compressor extremely inexpensively.
- A compressor according to the second embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in
FIGS. 1 and 2 except the discharge pipe and the introducing terminal. The same elements are designated with the same symbols. -
FIG. 3 is a vertical sectional view of a compressor according to the second embodiment of the invention, andFIG. 4 is a lateral sectional view of the compressor shown inFIG. 3 taken along arrows Y-Y. The compressor of this embodiment comprises thehermetical container 1, the compression mechanism disposed at a lower portion in thehermetical container 1 and having theshaft 2, thecylinder 3, theroller 4, thevane 7 and the like. The compressor also comprises the rotational motor disposed above the compression mechanism and having thestator 11, therotor 12 and the like. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of thehermetical container 1. In an upper portion of thehermetical container 1, there are provided the introducingterminal 13 for energizing the rotational motor in thehermetical container 1, and thedischarge pipe 32 for introducing the working fluid from thehermetical container 1 into the refrigeration cycle. - The
discharge pipe 32 extends into thehermetical container 1, and has acurved portion 32 b inside thehermetical container 1. Asuction port 32 a of thedischarge pipe 32 is located inside thecoil end 11 b on the upper end of thestator 11. Thesuction port 32 a of thedischarge pipe 32 is located closer to an inner peripheral surface of thecoil end 11 b than a central portion of thehermetical container 1. Thesuction port 32 a extends diagonally downward toward substantially the downstream in the rotation direction of theupper surface 12 b of therotor 12. In this embodiment, the throughholes 12 a (seeFIG. 11 ) of therotor 12 is not provided. - The oil-separating operation of the compressor having the above structure will be explained. The working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thenotches 11 a of thestator 11 and thegap 18 between thestator 11 and therotor 12 and moves to theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid which passed through the
notches 11 a of thestator 11 flows upward to the vicinity of thecoil end 11 b of thestator 11 and then, flows toward a central portion of thehermetical container 1 through an upper portion of thecoil end 11 b. Thereafter, the working fluid flows downward toward thesuction port 32 a of thedischarge pipe 32 which is disposed inside thecoil end 11 b. Then, the working fluid is drawn into thesuction port 32 a and again flows upward. Since thesuction port 32 a of thedischarge pipe 32 extends diagonally downward as in the first embodiment, the oil-separating effect of the refrigeration oil when the flow of the working fluid is changed from downward to the upward can be obtained. - If the working fluid reaches the vicinity of the
suction port 32 a of thedischarge pipe 32, since theupper surface 12 b of therotor 12 is rotational immediately below thesuction port 32 a, the working fluid turns by the viscosity. Since thesuction port 32 a of thedischarge pipe 32 is directed downstream of the turning flow, when the turning flow is drawing from thesuction port 32 a, the direction of the flow is abruptly changed from the downstream direction to the upstream direction with respect to the turning flow. At that time, the oil mist having high density flows further downstream by the inertial force and at the same time, the oil mist attaches to the inner peripheral surface of thecoil end 11 b and becomes liquid drop by the centrifugal force of the turning flow, and the oil mist is returned to theoil reservoir 16 formed in the bottom of thehermetical container 1 by the gravity. In the state which the refrigeration oil is separated from the working fluid which is less affected by the turning flow, the working fluid is introduced into thesuction port 32 a of thedischarge pipe 32. - According to the second embodiment, since the
suction port 32 a is located inside thecoil end 11 b and is opened toward the downstream of the rotational direction of therotor 12, the oil-separating effect is further enhanced as compared with the first embodiment by the change of flowing direction of the working fluid, and by the gravity and the centrifugal force applied to the oil mist which turns, and by the inertial force applied to the oil mist when the flowing direction of the working fluid is changed from the downstream flowing to the upstream flowing. With this, it is possible to further suppress the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor together with the working fluid. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to more efficiently prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in theoil reservoir 16 can always be maintained constantly, and it is possible to further enhance the reliability and efficiency of the compressor. - Since the
discharge pipe 32 has thecurved portion 32 b, it is possible to position thesuction port 32 a inside thecoil end 11 b irrespective of a position where thesuction port 32 a is mounted on thehermetical container 1. Therefore, it is possible to give a high priority to the position of the introducingterminal 13 and the like in the upper portion in thehermetical container 1, and the flexibility in design can largely be enhanced. For example, it is unnecessary to deviate the mounting position of the introducingterminal 13 so that the introducingterminal 13 does not hinder thedischarge pipe 31 unlike the first embodiment, and the introducingterminal 13 can be disposed in the center of the container. - A compressor according to the third embodiment of the present invention has the same structure as that of the compressor of the second embodiment as shown in
FIGS. 3 and 4 except the discharge pipe. The same elements are designated with the same symbols. -
FIG. 5 is a vertical sectional view of a compressor according to the third embodiment of the invention, andFIG. 6 is a lateral sectional view of the compressor shown inFIG. 5 taken along arrows Z-Z. The compressor of this embodiment comprises thehermetical container 1, the compression mechanism disposed at a lower portion in thehermetical container 1 and having theshaft 2, thecylinder 3, theroller 4, thevane 7 and the like. The compressor also comprises the rotational motor disposed above the compression mechanism and having thestator 11, therotor 12 and the like. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of thehermetical container 1. In an upper portion of thehermetical container 1, there are provided the introducingterminal 13 for energizing the rotational motor in thehermetical container 1, and thedischarge pipe 33 for introducing the working fluid from thehermetical container 1 into the refrigeration cycle. - The
discharge pipe 33 extends into thehermetical container 1, and has acurved portion 33 b inside thehermetical container 1. Asuction port 33 a of thedischarge pipe 33 is located inside thecoil end 11 b on the upper end of thestator 11. Thesuction port 33 a of thedischarge pipe 33 is disposed in the vicinity of the rotation center axis L of therotor 12 and is directed diagonally downward. In this embodiment, the throughholes 12 a (seeFIG. 11 ) of therotor 12 is not provided. - This oil-separating operation will be explained. As described above, the working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thenotches 11 a of thestator 11 and thegap 18 between thestator 11 and therotor 12, and moves into theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid which passed through the
notches 11 a of thestator 11 flows upward to the vicinity of thecoil end 11 b of thestator 11 and then, flows toward a central portion of thehermetical container 1 through an upper portion of thecoil end 11 b. Thereafter, the working fluid flows downward toward thesuction port 33 a of thedischarge pipe 33 located inside thecoil end 11 b. Then, the working fluid is drawn into thesuction port 33 a which is directed diagonally downward and again flows upward. With this change in flowing direction, the oil mist having high density drops downward by the gravity, and the refrigeration oil is separated. - If the working fluid reaches the vicinity of the
suction port 33 a of thedischarge pipe 33, since theupper surface 12 b of therotor 12 is rotational immediately below thesuction port 33 a, the working fluid turns by the viscosity. At that time, since the oil mist has higher density than that of the working fluid, the oil mist moves outward by the centrifugal force, the oil mist attaches to the inner peripheral surface ofheat exchanger stator 11 or thecoil end 11 b and becomes liquid drop, and is returned to theoil reservoir 16 formed in the bottom of thehermetical container 1. Since thesuction port 33 a of thedischarge pipe 33 is located at substantially the central portion in the turning flow in the vicinity of the rotation center axis L, the oil mist which is largely affected by the centrifugal force is removed substantially completely, and the refrigeration oil is separated from the working fluid which is less affected by the centrifugal force, and the working fluid is introduced into thesuction port 33 a of thedischarge pipe 33. - The oil-separating efficiency by the centrifugal force will be further enhanced if the following structure (not shown) is employed. That is, the introducing
terminal 13 is disposed on the upper end of thehermetical container 1, thedischarge pipe 33 passes through from the center of the upper portion of thehermetical container 1, and thesuction port 33 a is straight in shape and is located inside thecoil end 11 b. - According to this embodiment, the
suction port 33 a is located inside thecoil end 11 b. With this structure, the oil mist can be removed by the gravity of the change of flowing direction. Further, since thesuction port 33 a is opened in the vicinity of the rotation center axis L of therotor 12, the working fluid from which the oil mist is sufficiently removed can be drawn by the effect of the centrifugal force of the turning flow. Thus, the oil-separating operation is further facilitated as compared with the first embodiment. With this, it is possible to further suppress the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor together with the working fluid. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to more efficiently prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in theoil reservoir 16 can always be maintained constantly, and it is possible to further enhance the reliability and efficiency of the compressor. - A compressor according to the fourth embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in
FIGS. 1 and 2 except the discharge pipe and the introducing terminal. The same elements are designated with the same symbols. -
FIG. 7 is a vertical sectional view of a compressor according to the fourth embodiment of the invention. The compressor of this embodiment comprises the compression mechanism disposed at a lower portion in thehermetical container 1 and having theshaft 2, thecylinder 3, theroller 4, thevane 7 and the like. The compressor also comprises the rotational motor disposed above the compression mechanism and having thestator 11, therotor 12 and the like. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of the hermetical container. The introducingterminal 13 for energizing the rotational motor in thehermetical container 1 is provided in an upper portion of thehermetical container 1. Thehermetical container 1 is provided at its side surface with adischarge pipe 34 for introducing working fluid from thehermetical container 1 into the refrigeration cycle. Thedischarge pipe 34 passes through the side surface of thehermetical container 1, and has acurved portion 34 b. Asuction port 34 a as an open end of the hermetical container is located inside thecoil end 11 b of thestator 11. In this embodiment, the throughholes 12 a (seeFIG. 11 ) of therotor 12 is not provided. - According to the compressor of the fourth embodiment having such a structure, since the
suction port 34 a of thedischarge pipe 34 is located inside thecoil end 11 b as in the first embodiment, the same effect as that of the first embodiment can be obtained of course and thus, detailed explanation thereof will be omitted. - In the compressor of this embodiment, the
discharge pipe 34 passes through the side surface of thehermetical container 1, an upper portion in thehermetical container 1 can be used freely, and layout of the introducingterminal 13 is not limited. When the compressor is mounted in the refrigeration cycle, even if a high pressure side pipe is directed laterally, thedischarge pipe 34 can be connected directly, and there is effect that the structure of the refrigeration cycle becomes simple. In other words, the flexibility in design of the compressor can largely be enhanced. - The same effect as that of the second embodiment can be obtained if the following structure is employed. That is, in the compressor of the fourth embodiment, the
suction port 34 a of thedischarge pipe 34 is disposed closer to the inner peripheral surface of thecoil end 11 b than the central portion of thehermetical container 1 as in the second embodiment, and thesuction port 34 a is directed toward substantially the downstream in the rotation direction of theupper surface 12 b of therotor 12. - In the compressor of the fourth embodiment, the same effect as that of the third embodiment can be obtained if the
suction port 34 a of thedischarge pipe 34 is disposed in the vicinity of the rotation center axis L as in the third embodiment. - A compressor according to the fifth embodiment of the present invention has the same structure as that of the compressor of the first embodiment as shown in
FIGS. 1 and 2 except the discharge pipe. The same elements are designated with the same symbols. -
FIG. 8 is a vertical sectional view of a compressor according to the fifth embodiment of the invention. The compressor of this embodiment comprises the compression mechanism disposed at a lower portion in the hermetical container land having theshaft 2, thecylinder 3, theroller 4, thevane 7 and the like. The compressor also comprises the rotational motor disposed above the compression mechanism and having thestator 11, therotor 12 and the like. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of the hermetical container. In an upper portion of thehermetical container 1, there are provided the introducingterminal 13 for energizing the rotational motor in thehermetical container 1, and thedischarge pipe 35 for introducing the working fluid from thehermetical container 1 into the refrigeration cycle. - The
discharge pipe 35 is mounted in an upper portion of thehermetical container 1 closer to the center thereof than an inner diameter of thecoil end 11 b, and passes through thehermetical container 1. Asuction port 35 a of thedischarge pipe 35 is located inside thecoil end 11 b of thestator 11. Thedischarge pipe 35 is straight pipe having a step, i.e., an inner diameter of thedischarge pipe 35 in the vicinity of thesuction port 35 a is enlarged. In this embodiment, the throughholes 12 a (seeFIG. 11 ) of therotor 12 is not provided. - According to the compressor of the fifth embodiment having such a structure, since the
suction port 35 a of thedischarge pipe 35 is located inside thecoil end 11 b as in the first embodiment, the same effect as that of the first embodiment can be obtained of course. - As the flow velocity of the working fluid at the
suction port 35 a is greater, the refrigeration oil near thesuction port 35 a is more prone to be drawn together with the working fluid before the refrigeration oil is separated from the working fluid by the gravity and the centrifugal force. However, since the inner diameter of thedischarge pipe 35 in the vicinity of thesuction port 35 a is enlarged, the flow velocity of the working fluid in the vicinity of thesuction port 35 a of thedischarge pipe 35 is smaller as compared with a case in which the inner diameter is enlarged. Therefore, the amount of oil mist which is drawn together with the working fluid can be reduced, and the refrigeration oil-separating effect of the first to third embodiments can further be enhanced. - The same effect as that of the second embodiment can be obtained if the following structure is employed. That is, in the compressor of the fifth embodiment, the
suction port 35 a of thedischarge pipe 35 is disposed closer to the inner peripheral surface of thecoil end 11 b than the central portion of thehermetical container 1 as in the second embodiment, and thesuction port 35 a is directed diagonally downward toward substantially the downstream in the rotation direction of theupper surface 12 b of therotor 12. - In the compressor of the fifth embodiment, the same effect as that of the third embodiment can be obtained if the
suction port 35 a of thedischarge pipe 35 is disposed in the vicinity of the rotation center axis L as in the third embodiment and thedischarge pipe 35 is directed diagonally downward. - A compressor according to the sixth embodiment of the present invention has the same structure as that of the compressor of the second embodiment as shown in
FIGS. 3 and 4 except the hermetical container and the discharge pipe. The same elements are designated with the same symbols. -
FIG. 9 is a vertical sectional view of a compressor according to the sixth embodiment of the invention. According to the compressor of this embodiment, the compression mechanism comprising theshaft 2, thecylinder 3, theroller 4, thevane 7 and the like is disposed in a lower portion in ahermetical container 36, and the rotational motor comprising thestator 11 and therotor 12 is disposed in an upper portion in thehermetical container 36. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of thehermetical container 36. Each of the upper portion of the bottom (including inner surface of the container) of thehermetical container 36 is domical in shape which comprises a combination of a peripheral r-portion 36 a having a smaller diameter and an inner R-portion 36 b having a larger diameter. - The introducing
terminal 13 for energizing the rotational motor in thehermetical container 36 and adischarge pipe 37 for introducing working fluid from thehermetical container 36 into the refrigeration cycle are provided in an upper portion of thehermetical container 36. Thedischarge pipe 37 passes through thehermetical container 36, and thesuction port 37 a is located inside thecoil end 11 b on the upper end of thestator 11. - According to the compressor of the sixth embodiment having such a structure, since the
suction port 37 a of thedischarge pipe 37 is located inside thecoil end 11 b as in the first embodiment, the same effect as that of the first embodiment can be obtained of course. - The working fluid which passed through the
notches 11 a of thestator 11 flows upward to the vicinity of thecoil end 11 b of thestator 11 and then, passes through the upper portion of thecoil end 11 b and flows toward the center of thehermetical container 36. Here, since at least the upper portion of thehermetical container 36 is domical in shape, the working fluid flows toward the center of thehermetical container 36 along the r-portion 36 a and the R-portion 36 b, and it is possible to prevent the flow velocity from being lowered. Therefore, after that, the downward flow velocity toward thesuction port 37 a of thedischarge pipe 37 located inside thecoil end 11 b is also increased. When the working fluid is drawn into thesuction port 37 a of thedischarge pipe 37, the flow of the working fluid is again changed into the upward flow, but the oil-separating effect by the gravity and the centrifugal force at that time can further be enhanced. - Since the
hermetical container 36 is domical in shape, the refrigeration cycle is a supercritical cycle of working fluid having carbon dioxide as main composition. Thus, even when a pressure in thehermetical container 36 is extremely high, the strength of thehermetical container 36 can be maintained and safety can be secured. - In the compressors of the first to sixth embodiments, working fluid having the environment-friendly carbon dioxide as main composition, the working fluid in the
hermetical container -
FIG. 10 is a vertical sectional view of a compressor according to the seventh embodiment of the invention, andFIG. 11 is a lateral sectional view of the compressor shown inFIG. 10 taken along arrows X-X. The compressor according to the seventh embodiment of the present invention has almost the same structure as that of the conventional compressor. The same elements are designated with the same symbols. - The compressor of this embodiment comprises the
hermetical container 1, the compression mechanism disposed in a lower portion in thehermetical container 1, and the rotational motor disposed in an upper portion in thehermetical container 1. The compression mechanism comprises theshaft 2 capable of rotational around the rotation center axis L, thecylinder 3 having thecylindrical surface 3 a therein, theroller 4 fitted over theeccentric portion 2 a of theshaft 2 and eccentrically rotational inside thecylinder 3 with the rotation of theshaft 2, thevane 7 which reciprocates within thevane groove 3 b of thecylinder 3 while a tip end of thevane 7 being in contact with theroller 4 and which divides a space defined by thecylinder 3 and theroller 4 into thesuction chamber 5 and thecompression chamber 6, thespring 8 which is disposed on a back surface of thevane 7 and which pushes thevane 7 against theroller 4, and theupper bearing 9 and alower bearing 10 which support theshaft 2. Theupper bearing 9 includes aflow path 9 a which is connected to thesuction pipe 15 and which introduces working fluid drawing from thesuction pipe 15 into thesuction chamber 5, and the discharginghole 9 b which discharges working fluid compressed in thecompression chamber 6 into thelower space 17 of the rotational motor. - The rotational motor comprises the
stator 11 shrinkage fitted into thehermetical container 1, and therotor 12 which is shrinkage fitted to theshaft 2 and rotates in the inner periphery of thestator 11. Thestator 11 is provided at its upper end with thecoil end 11 b and at its lower end with thecoil end 11 d. Thestator 11 is provided at its outer periphery with a plurality ofnotches 11 a which bring thelower space 17 and theupper space 19 into communication with each other. Thenotches 11 a serve as flow paths for working fluid. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of thehermetical container 1. - A
thin cylinder 41 as a dividing member is fitted over thecoil end 11 b formed on the upper end of thestator 11, and anupper space 19 of the rotational motor is divided by thethin cylinder 41 into aninner space 19 a and anouter space 19 b. Thisthin cylinder 41 is made of insulative Teflon (registered trademark), and its thickness of about 1 mm. Thethin cylinder 41 has abent portion 41 a formed in the vicinity of theupper end surface 11 c of thecoil end 11 b. An inner diameter of thebent portion 41 a of thethin cylinder 41 is reduced toward its top, and agap 44 serving as a flow path of the working fluid is formed between anupper end 41 b of thethin cylinder 41 and anupper end surface 1 a of thehermetical container 1. - The introducing
terminal 13 for energizing the rotational motor in thehermetical container 1 and thedischarge pipe 40 for introducing the working fluid from theupper space 19 in thehermetical container 1 into the refrigeration cycle are provided in an upper portion in thehermetical container 1. Thedischarge pipe 40 passes through thehermetical container 1, and has acurved portion 40 b inside thehermetical container 1. Asuction port 40 a of thedischarge pipe 40 as an open end of the hermetical container is located below thegap 44 inside the thin cylinder 41 (i.e., inside theinner space 19 a). That is, thesuction port 40 a is disposed at a lower position than theupper end 41 b of thethin cylinder 41. Thesuction port 40 a of thedischarge pipe 40 is disposed in the vicinity of the rotation center axis L of therotor 12 and is directed diagonally downward. Therefore, the introducingterminal 13 is mounted at a position where the mounting of thedischarge pipe 40 provided on the upper portion of heatexchanger hermetical container 1 is not hindered. In this embodiment, the throughholes 12 a (seeFIG. 6 ) of therotor 12 by the same oil-separating plate method as that of the conventional technique is not provided. - Next, the operation of the compressor having the above-described structure will be explained. The working fluid is introduced from the
suction pipe 15 into thesuction chamber 5 through theflow path 9 a provided in theupper bearing 9. If the rotational motor is energized and theshaft 2 which is integral with therotor 12 is rotated, theroller 4 eccentrically rotates, the capacities of thesuction chamber 5 and thecompression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharginghole 9 b is opened, oil mist which is supplied from theoil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into thelower space 17 of the rotational motor. The working fluid in thelower space 17 passes throughnotches 11 a formed in the outer periphery of thestator 11 as gaps between thehermetical container 1 and the rotational motor formed on the outer periphery of thestator 11, and through a gap 18 (air gap) between thestator 11 and therotor 12, and flows into theupper space 19 of the rotational motor. The working fluid is separated from the refrigeration oil in theupper space 19, and is discharged from thedischarge pipe 14. - This oil-separating operation will be explained. As described above, the working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thegap 18 between thestator 11 and therotor 12 and thenotches 11 a of thestator 11, and moves into theinner space 19 a and theouter space 19 b of theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid which flowed into the
outer space 19 b of thethin cylinder 41 through thenotches 11 a of thestator 11 passes through thegap 44 between theupper end 41 b of thethin cylinder 41 and theupper end surface 1 a in thehermetical container 1, and flows into theinner space 19 a of thethin cylinder 41. The working fluid in theinner space 19 a of thethin cylinder 41 is drawn into thesuction port 40 a located below thegap 44, and is discharged into the outside refrigeration cycle. Since therotor 12 rotates at high speed in theinner space 19 a of thethin cylinder 41, a turning flow around the rotation center axis L is generated in the working fluid in theinner space 19 a of thethin cylinder 41. - The oil-separating operation and its effect will be explained in detail.
- The
thin cylinder 41 is fitted over thecoil end 11 b and theupper space 19 of the rotational motor is divided into theinner space 19 a and theouter space 19 b of thethin cylinder 41. Therefore, it is possible to limit the flow path of the working fluid which flowed into theupper space 19 through thenotches 11 a of thestator 11. - That is, since there is provided the
thin cylinder 41 which divides theupper space 19 into theinner space 19 a and theouter space 19 b, it is possible to prevent the turning flow of theinner space 19 a of thethin cylinder 41 from being dispersed to theouter space 19 b of thethin cylinder 41. Thus, attenuation of rotational motion energy is suppressed. Therefore, it becomes easily to maintain the turning flow velocity of theinner space 19 a of thethin cylinder 41 in a portion of thecoil end 11 b higher than theupper end surface 11 c, and strong centrifugal force is applied to the working fluid and oil mist which flow toward thesuction port 40 a provided in a lower portion of thegap 44 through thegap 44 between theupper end 41 b of thethin cylinder 41 and theupper end surface 1 a in thehermetical container 1. Therefore, the oil mist having higher density than the working fluid attaches to the inner side surface of thethin cylinder 41 and becomes liquid drop. Since the the liquid drop has higher density than the working fluid, the liquid drop flows lower than the working fluid and is separated from the working fluid. - Since the
gap 44 is provided between theupper end 41 b of thethin cylinder 41 and theupper end surface 1 a in thehermetical container 1, the working fluid which passed through thenotches 11 a of thestator 11 and which includes oil mist flows upward to the vicinity of the upper end of thehermetical container 1 through theouter space 19 b and then, passes through thegap 44 and flows into theinner space 19 a of thethin cylinder 41. Thegap 44 is formed immediately below theupper end surface 1 a in thehermetical container 1 and theinner space 19 a of thethin cylinder 41 spreads below thegap 44. Thus, the working fluid which flowed into theinner space 19 a of thethin cylinder 41 forms a flow having downward flow velocity component while enlarging the flow width. The oil mist mixed into the working fluid which flows downward receives downward flow velocity component from the peripheral working fluid. Since the oil mist has higher density than the working fluid and gravity acting on the refrigeration oil is greater than gravity acting on the working fluid, the oil mist has greater downward velocity component than the working fluid. Thus, the oil mist flows downward of the working fluid and is separated from the working fluid. That is, since the working fluid flows into theinner space 19 a of thethin cylinder 41 through thegap 44 between theupper end 41 b of thethin cylinder 41 and theupper end surface 1 a in thehermetical container 1, the oil mist is separated from the working fluid. - In this embodiment, since the
discharge pipe 40 passes through thehermetical container 1 and thesuction port 40 a of thedischarge pipe 40 is located lower than thegap 44 at theinner space 19 a of thethin cylinder 41, the working fluid flowing into theinner space 19 a from thegap 44 flows more downward toward thesuction port 40 a. Thus, the oil mist receives strong downward external force from the working fluid, and the oil mist is prone to be separated from the working fluid. Thesuction port 40 a of thedischarge pipe 40 opens diagonally downward, and the flowing direction of the working fluid drawn into thesuction port 40 a is abruptly changed from downward to upward. Thus, the oil mist which is attracted by thesuction port 40 a and flows downward has higher density and greater inertial force than the working fluid. Thus, the oil mist downwardly flows into theupper surface 12 b of therotor 12 without changing the flowing direction to the upward. The working fluid having lower density and smaller inertial force than the refrigeration oil is drawing into thesuction port 40 a. Thus, the working fluid and the oil mist are separated from each other. - Since the
rotor 12 is rotational in theinner space 19 a of thethin cylinder 41, the turning flow is generated in viscosity in the vicinity of theupper surface 12 b of therotor 12. As the working fluid in theinner space 19 a of thethin cylinder 41 reaches the vicinity of theupper surface 12 b of therotor 12 by a shearing force received from the turning flow, the flow velocity component in the rotational direction is increased. In a portion of thecoil end 11 b higher than theupper end surface 11 c, a region which receives heat exchanger influence of the turning flow is increased to the inner side surface of thethin cylinder 41 fitted over thecoil end 11 b and thus, the flow velocity in the rotational direction of the working fluid is abruptly reduced. However, since the inner side surface of thethin cylinder 41 is cylindrical in shape, the loss of the flow velocity in the rotational direction of the working fluid given by the inner side surface of thethin cylinder 41 higher than theupper end surface 11 c of thecoil end 11 b becomes extremely small. - Further, since a higher portion of
bent portion 41 a of thethin cylinder 41 has smaller inner diameter, an external force acting toward the inner side surface of thethin cylinder 41 by the centrifugal force of the working fluid which rotates inside is applied to the liquid drop of the refrigeration oil attached to the upper portion of thebent portion 41 a of thethin cylinder 41. A component of force perpendicular to the inner side surface of thethin cylinder 41 of the external force acting torward the inner side surface of thethin cylinder 41 is in balance with a reaction force from the inner side surface of thethin cylinder 41, but there remains a component of force which is parallel to the inner side surface of thethin cylinder 41. Therefore, a downward force which is in parallel to the inner side surface of thethin cylinder 41 acts on the liquid drop of the refrigeration oil attached to the upper portion of thebent portion 41 a of thethin cylinder 41, and the downward flow of the working fluid is accelerated. - Oil mist which is not attached to the inner side surface of the
thin cylinder 41 and is not drawn into thesuction port 40 a of thedischarge pipe 40 has higher density than the working fluid in a lower portion of thesuction port 40 a of thedischarge pipe 40, the oil mist reaches nearer to theupper surface 12 b of therotor 12 than the working fluid. - Since the
thin cylinder 41 is fixed to the outer side of thecoil end 11 b, oil mist which received greater turning flow velocity and greater centrifugal force in the vicinity of theupper surface 12 b of therotor 12 attaches to thecoil end 11 b which comprises a plurality of copper wires and provided at its surface with complicated bumps and dips. Therefore, the oil mist is prone to grow into the liquid drop and the oil mist is separated from the working fluid easily. - With the above effect, the refrigeration oil which grew into the liquid drop from the fog drip and which was separated from the working fluid passes through the
gap 18 between thestator 11 and therotor 12 by the gravity, and is returned into theoil reservoir 16 formed in the bottom of thehermetical container 1. The working fluid having smaller centrifugal force caused by turning flow than the refrigeration oil and collected to the center of theinner space 19 a of thethin cylinder 41 is introduced into thesuction port 40 a of thedischarge pipe 40 in a state where the refrigeration oil is separated from the working fluid. - As described above, in this embodiment, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the
oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. - In this embodiment, the
thin cylinder 41 is fitted over thecoil end 11 b, the gap is provided between the upper end of thethin cylinder 41 and the upper end surface in thehermetical container 1, and thedischarge pipe 40 is extended and itssuction port 40 a is located inside thethin cylinder 41. Therefore, the effect of this embodiment can easily be obtained only by slightly changing the conventional compressor, and the compressor is extremely inexpensive. -
FIG. 12 is a vertical sectional view of a compressor according to the eighth embodiment of the invention. The compressor according to the eighth embodiment of the present invention has the same structure as that of the compressor of the seventh embodiment as shown inFIGS. 10 and 11 except the thin cylinder. The same elements are designated with the same symbols. Explanation of the same structure and effect as those of the seventh embodiment will be omitted. - In the compressor of this embodiment, a
thin cylinder 42 as a dividing member is fitted into thecoil end 11 b on the upper end of thestator 11, and theupper space 19 of the rotational motor is divided by thethin cylinder 42 into theinner space 19 a and theouter space 19 b. An inner diameter of an inner side surface of thethin cylinder 42 is reduced from its lower end toward the upper end. Agap 44 is provided between theupper end 42 b of thethin cylinder 42 and theupper end surface 1 a in thehermetical container 1. - Nest the oil-separating operation of the
thin cylinder 42 and its effect will be explained. - The rotational motion energy caused by shrinkage fit is given to the working fluid in the
inner space 19 a of thethin cylinder 42 by a turning flow generated in the vicinity of theupper surface 12 b of therotor 12, and the turning flow is generated in the working fluid. However, by fitting thethin cylinder 42 into thecoil end 11 b, a region of theinner space 19 a is reduced as compared with a case in which thethin cylinder 42 is fitted over thecoil end 11 b and thus, the dispersion of the rotational motion energy is suppressed. Thus, as compared with the seventh embodiment, the turning flow velocity of theinner space 19 a of thethin cylinder 42 is increased as a whole. The working fluid which flowed into theinner space 19 a from thegap 44 of theupper end 42 b of thethin cylinder 42 receives stronger centrifugal force than the seventh embodiment. Therefore, oil mist is prone to attach to the inner side surface of thethin cylinder 42 due to a difference in centrifugal force caused by difference in density between the working fluid and the refrigeration oil, the growth of the oil mist into the liquid drop is facilitated, and the refrigeration oil is separated from the working fluid easily. - Since the
thin cylinder 42 is fitted into thecoil end 11 b, there is no obstruction in thethin cylinder 42 which limits the flexibility in shape of thethin cylinder 42. Therefore, the inner diameter of the inner side surface of thethin cylinder 42 can further be reduced from its lower end toward its upper ends as compared with the compressor of the seventh embodiment. Thus, the component of force perpendicular to the inner side surface of thethin cylinder 42 of the centrifugal force applied to the liquid drop of the refrigeration oil attached to the inner side surface of thethin cylinder 42 is brought into balance with the reaction force from the inner side surface of thethin cylinder 42, and there remains a component of force which is parallel to the inner side surface of thethin cylinder 42 of the centrifugal force applied to the liquid drop of the refrigeration oil attached to the inner side surface of thethin cylinder 42. Therefore, the downward flow of the liquid drop of the refrigeration oil attached to the inner side surface from the lower end to the upper end of thethin cylinder 42 is accelerated, and the refrigeration oil is returned into theoil reservoir 16 formed in the bottom of thehermetical container 1 more easily as compared with the compressor of the seventh embodiment. - In addition to the above-described effect, the eighth embodiment can obtain the effect of the seventh embodiment of course.
- As described above, in this embodiment, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the
oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. -
FIG. 13 is a vertical sectional view of a compressor according to the ninth embodiment of the invention. The compressor according to the eighth embodiment of the present invention has the same structure as that of the compressor of the seventh embodiment as shown inFIGS. 10 and 11 except the thin cylinder. The same elements are designated with the same symbols. Explanation of the same structure and effect as those of the seventh embodiment will be omitted. - In the compressor of this embodiment, a
thin cylinder 43 as a dividing member is fitted into thecoil end 11 b on the upper end of thestator 11, and theupper space 19 of the rotational motor is divided by thethin cylinder 43 into theinner space 19 a and theouter space 19 b. At that time, an upper end of thethin cylinder 43 is brought into contact with theupper end surface 1 a in thehermetical container 1 and fixed thereto. A plurality of communication holes 45 are formed in the upper portion of thethin cylinder 43 as flow paths for working fluid which brings theinner space 19 a and theouter space 19 b into communication with each other. Aflange 43 a extending inside thethin cylinder 43 from a lower inner side surface of thethin cylinder 43 is provided in the vicinity of theupper surface 12 b of therotor 12. Theinner space 19 a of thethin cylinder 43 is divided by theflange 43 a into anupper space 19 a′ and alower space 19 c. Aflow path 46 which brings theupper space 19 a′ and thelower space 19 c into communication with each other is formed in a center of theflange 43 a. - Next, the oil-separating operation of the
thin cylinder 43 and theflange 43 a and its effect will be explained. - Since the
inner space 19 a and theouter space 19 b divided by thethin cylinder 43 are in communication with each other through the plurality of communication holes 45 formed in the upper portion of thethin cylinder 43, the upper end of thethin cylinder 43 can be brought into contact with theupper end surface 1 a in thehermetical container 1 and fixed thereto. Therefore, the positioning precision of the dividing member in the vertical direction when the compressor is assembled is enhanced irrespective of the installation place of the dividing member inside or outside the coil end. If the thin cylinder is provided outside the coil end, the possibility of contact with the thin cylinder and the rotor which rotates at high speed is lowered, damage caused by contact between the thin cylinder and the rotor is prevented, and a compressor having high reliability can be provided. - The
flange 43 a extending toward the rotation center axis L is provided on the inner periphery of thethin cylinder 43, theinner space 19 a of thethin cylinder 43 is divided by theflange 43 a into theupper space 19 a′ and thelower space 19 c, and theflow path 46 for bringing theupper space 19 a′ and thelower space 19 c into communication with each other is formed in the center of theflange 43 a. Therefore, in thelower space 19 c of thethin cylinder 43, strong centrifugal force acting outwardly from the rotation center axis L is applied to the working fluid which receives the rotational motion energy by viscosity from theupper surface 12 b of therotational rotor 12. The working fluid on which the strong centrifugal force acts flows in the radial direction toward the inner side surface of thethin cylinder 43 through thelower space 19 c between theflange 43 a and theupper surface 12 b of therotor 12, and flows downwardly through thegap 18 between therotor 12 and thestator 11 along a corner formed between theflange 43 a and the inner side surface of thethin cylinder 43. - At that time, since the working fluid flows outwardly in the vicinity of the rotation center axis L of the
upper surface 12 b of therotor 12, the pressure is lowered, and the working fluid flows into thelower space 19 c of theflange 43 a through theflow path 46 from theupper space 19 a′ of theflange 43 a. Thus, since thethin cylinder 43 is fitted into thecoil end 11 b and the working fluid is allowed to flow into theinner space 19 a of thethin cylinder 43 from the upper portion of thethin cylinder 43, fog drip and liquid drop of the refrigeration oil separated from the working fluid and collected into the lower portion of theupper space 19 a′ of theflange 43 a are forcibly returned into theoil reservoir 16 formed in the bottom of thehermetical container 1 from theflow path 46 of theflange 43 a through the thelower space 19 c and thegap 18 between therotor 12 and thestator 11. Since the fog drip and liquid drop of the refrigeration oil collected into the lower portion of theupper space 19 a′ of theflange 43 a are forcibly returned into theoil reservoir 16 in this manner, it is possible to further prevent the concentration of the oil mist of theupper space 19 a′ of theflange 43 a from being lowered, and to prevent the refrigeration oil from being discharged from the compressor. - Although the
flange 43 a is formed on the inner periphery of thethin cylinder 43, it is possible to independently provide the flange on the inner periphery of the upper end coil end (this structure is not shown). By the same effect as that of this embodiment, it is possible to forcibly return the fog drip and liquid drop of the refrigeration oil in the vicinity of the flange into the oil reservoir from the lower space formed by the flange. - In addition to the above-described effect, the ninth embodiment can obtain the effect of the seventh and eighth embodiments of course.
- As described above, in this embodiment, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced. The refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the
oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. - In in the compressor of any of the seventh to ninth embodiments, the working fluid in the
hermetical container 1 is brought into the supercritical state using working fluid comprising environment-friendly carbon dioxide, and the meltage of the refrigeration oil with respect to the working fluid is increased. The oil-separating effect is enhanced by effect of thethin cylinder 41 and the like. -
FIG. 14 is a vertical sectional view of a compressor according to a tenth embodiment of the invention,FIG. 15 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows X-X,FIG. 16 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows Y-Y andFIG. 17 is a lateral sectional view of the compressor shown inFIG. 14 taken along arrows Z-Z. The compressor according to the tenth embodiment of the present invention has almost the same structure as that of the conventional compressor. The same elements are designated with the same symbols. - The compressor of this embodiment comprises the
hermetical container 1, the compression mechanism disposed in a lower portion in thehermetical container 1, and the rotational motor disposed in an upper portion in thehermetical container 1. The compression mechanism comprises theshaft 2 capable of rotational around the rotation center axis L, thecylinder 3 having thecylindrical surface 3 a therein, theroller 4 fitted over theeccentric portion 2 a of theshaft 2 and eccentrically rotational inside thecylinder 3 with the rotation of theshaft 2, thevane 7 which reciprocates within thevane groove 3 b of thecylinder 3 while a tip end of thevane 7 being in contact with theroller 4 and which divides a space defined by thecylinder 3 and the roller 4into thesuction chamber 5 and thecompression chamber 6, thespring 8 which is disposed on a back surface of thevane 7 and which pushes thevane 7 against theroller 4, and theupper bearing 9 and alower bearing 10 which support theshaft 2. Theupper bearing 9 includes aflow path 9 a which is connected to thesuction pipe 15 and which introduces working fluid drawing from thesuction pipe 15 into thesuction chamber 5, and the discharginghole 9 b which discharges working fluid compressed in thecompression chamber 6 into thelower space 17 of the rotational motor. - The rotational motor comprises the
stator 11 shrinkage fitted into thehermetical container 1, and therotor 12 which is shrinkage fitted to theshaft 2 and rotates in the inner periphery of thestator 11. Thestator 11 is provided at its upper end with thecoil end 11 b and at its lower end with thecoil end 11 d. Thestator 11 is provided at its outer periphery with a plurality ofnotches 11 a which bring thelower space 17 and theupper space 19 into communication with each other. Thenotches 11 a serve as flow paths for working fluid. Refrigeration oil is reserved in theoil reservoir 16 formed in the bottom of thehermetical container 1. - The
hermetical container 1 comprises three elements, i.e., anupper shell 50, abarrel shell 51 and a lower shell 52. Thehermetical container 1 is formed by welding. An introducingterminal 54 for energizing the rotational motor in thehermetical container 1 is disposed in the center of theupper shell 50. Acolumnar cluster 55 is mounted on the introducingterminal 54 in thehermetical container 1 such that a mounting gap is not substantially generated, and thestator 11 of the rotational motor is energized through thelead wire 25. Thiscolumnar cluster 55 is provided in the upper central portion of the hermetical container such that a center axis of thecluster 55 substantially coincides with the rotation center axis L of the rotational motor. An outer diameter of thecluster 55 is smaller than an inner diameter of thecoil end 11 b on the upper end of thestator 11. - A
discharge pipe 53 is provided on a side surface of an upper portion of the hermetical container 1 (upper shell 50) for introducing the working fluid into the refrigeration cycle outside thehermetical container 1 from theupper space 19 in thehermetical container 1. Thedischarge pipe 53 passes through thehermetical container 1 from a side surface of theupper shell 50. Thedischarge pipe 53 is formed at a lower position than a lower surface of thecluster 55. Asuction port 53 a of thedischarge pipe 53 as an open end into the hermetical container projects from an inner wall surface of thehermetical container 1. - A carbon dioxide refrigerant which is a natural refrigerant is used as the working fluid. In this embodiment, the through
holes 12 a (seeFIG. 8 ) of therotor 12 by the same oil-separating plate method as that of the conventional technique is not provided. - Next, the operation of the compressor having the above-described structure will be explained. The working fluid is introduced from the
suction pipe 15 into thesuction chamber 5 through theflow path 9 a provided in theupper bearing 9. If the rotational motor is energized and theshaft 2 which is integral with therotor 12 is rotated, theroller 4 eccentrically rotates, the capacities of thesuction chamber 5 and thecompression chamber 6 are varied. With this, the working fluid is drawn and compressed. When a discharge valve (not shown) of the discharginghole 9 b is opened, oil mist which is supplied from theoil reservoir 16 and which lubricated the compression mechanism is mixed into the compressed working fluid, and this mixture is discharged into thelower space 17 of the rotational motor. The working fluid in thelower space 17 passes throughnotches 11 a formed in the outer periphery of thestator 11 as gaps between the rotational motor and thehermetical container 1, and through a gap 18 (air gap) between thestator 11 and therotor 12, and flows into theupper space 19 of the rotational motor. The working fluid is separated from the refrigeration oil in theupper space 19, and is discharged from thedischarge pipe 14. - This oil-separating operation will be explained. As described above, the working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thenotches 11 a of thestator 11 and thegap 18 between thestator 11 and therotor 12, and moves into theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid including the oil mist passing through the
notches 11 a of thestator 11 flows into theupper space 19 of the rotational motor along a wall surface of the hermetical container 1 (barrel shell 51 and the upper shell 50) and then, the working fluid flows downward toward the inner space of thecoil end 11 b along a side surface of thecluster 55 disposed in the center of theupper shell 50. - Since the
rotor 12 of the rotational motor is rotational at high speed, a shearing force caused by theupper surface 12 b of therotor 12 is applied to the downward flow of the working fluid, and turning flow around the rotation center axis L of therotor 12 is generated. At that time, since thecluster 55 is columnar in shape which is symmetric with respect to the rotation center axis L, the turning flow around thecluster 55 is further prone to be generated, and the flow velocity of the turning flow is uniformly increased. Therefore, the working fluid and the refrigeration oil are separated by a centrifugal force caused by a difference in density therebetween, the oil mist moves toward the outer peripheral portion of the turning flow, and attaches to the inner wall surface of theupper shell 50 and becomes oil drop. The oil drop drops downward and is returned into theoil reservoir 16 formed in the bottom of thehermetical container 1. - The working fluid which flowed to the inner space of the
coil end 11 b on the upper end of thestator 11 and which includes the oil mist turns and flows in the inner space of thecoil end 11 b, and the oil mist is separated from the working fluid by the centrifugal force, the oil mist attaches to the inner peripheral surface of thecoil end 11 b and becomes oil drop and drops downward, and the oil drop is returned to theoil reservoir 16 formed in the bottom of thehermetical container 1. - The working fluid from which the oil mist is separated flows around a region close to the center of the turning flow which is away from an inner wall surface of the
hermetical container 1. Since thesuction port 53 a projects from the inner wall surface of thehermetical container 1 and thesuction port 53 a is inserted into this region in this embodiment, most of refrigeration oil is separated from the working fluid which flowed into thedischarge pipe 53 and discharged from the compressor. - Since the
discharge pipe 53 is lower than the lower surface of thecluster 55, the flow of the working fluid flowing into theupper space 19 is shut off by the side surface of thecluster 55, and the working fluid does not flow into thesuction port 53 a of thedischarge pipe 53 directly. Further, since thecluster 55 is disposed in the introducingterminal 54 such that a mounting gap is not generated and thus, the working fluid which flowed into theupper space 19 does not pass through the mounting gap between thecluster 55 and the introducingterminal 54. Therefore, the turning flow is not disturbed. - The
hermetical container 1 is divided into theupper shell 50, thebarrel shell 51 and the lower shell 52. Therefore, thedischarge pipe 53 and the introducingterminal 54 can be bonded to theupper shell 50 previously, or the compression mechanism and the rotational motor can be fitted to thebarrel shell 51. Therefore, the assembling operation of the compressor is facilitated. The outer diameter of thecluster 55 is set smaller than the inner diameter of thecoil end 11 b. Therefore, there is effect that a space for flowing is increased, and the turning flow of the inner space of thecoil end 11 b can easily be developed into turning flow around thecluster 55. - As described above, in this embodiment, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced extremely. Therefore, the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the
oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. - To prevent the global warming, it is proposed to employ, as a refrigerant, a carbon dioxide refrigerant which is a natural refrigerant having lower worming coefficient. If the carbon dioxide refrigerant is used as the working fluid, a pressure of the compressed working fluid becomes extremely high, a mixing rate of the refrigeration oil into the working fluid is increased, and it becomes difficult to separate the oil from the working fluid. In this regard, according to this embodiment, since the turning flow around the
columnar cluster 55 is accelerated, it is possible to easily separate the working fluid and the oil mist from each other. - In the tenth embodiment, only the
cluster 55 and thedischarge pipe 53 are changed and oil can easily be separated with slight change. Therefore, there is effect that the compressor can be provided extremely inexpensively. - In the compressor of the tenth embodiment, the radial gap between the
cluster 55 and theupper shell 50 of thehermetical container 1 is equal to or smaller than the outer diameter of thecluster 55, the turning flow around thecluster 55 can further be accelerated and thus, the oil-separating efficiency can be enhanced. For example, if the outer diameter of thecolumnar cluster 55 is 28 mm and the inner diameter of theupper shell 50 is about 84 mm or less, it is possible to remarkably reduce the amount of refrigeration oil delivered to the refrigeration cycle outside the compressor. - The flow velocity of the turning flow is increased as the inner diameter of the
hermetical container 1 is smaller. Thus, the oil-separating effect by the turning flow becomes higher. The oil-separating effect can be enhanced only by forming thecluster 55 into the columnar shape and by allowing thedischarge pipe 53 to pass through the side surface of theupper shell 50. Therefore, the tenth embodiment can easily be applied to the compressor with thehermetical container 1 having the outer diameter as extremely small as about 80 mm or less. - The
discharge pipe 53 passes through the side surface of theupper shell 50 in the compressor of the tenth embodiment. If the height of theupper shell 50 is reduced and the height of thebarrel shell 51 is increased, thedischarge pipe 53 can pass through the side surface of thebarrel shell 51, and the same effect can be obtained also in this structure (not shown). - A compressor of the eleventh embodiment is the same as the compressor of the tenth embodiment shown in
FIGS. 14, 15 and 16. A vertical sectional view of the compressor of the eleventh embodiment is the same as that shown inFIG. 14 .FIG. 18 is a lateral sectional view of a compressor according to the eleventh embodiment of the invention taken along arrows Z-Z inFIG. 14 . The same elements are designated with the same symbols. Explanation of the same structure and effect as those of the tenth embodiment will be omitted. - The eleventh embodiment is the same as the tenth embodiment except a
discharge pipe 63, an introducingterminal 64, and a hexagonalcolumnar cluster 65 mounted on the introducingterminal 64. The hexagonalcolumnar cluster 65 is mounted on the introducingterminal 64 disposed in the center of theupper shell 50 such that almost no mounting gap is generated, and thestator 11 of the rotational motor is energized through thelead wire 25. Thecluster 65 is provided in an upper central portion in thehermetical container 1 such that a center axis of thecluster 65 substantially coincides with the rotation center axis L of the rotational motor. Aside surface 65 a of the hexagonalcolumnar cluster 65 is opposed to thenotches 11 a formed in thestator 11. An outer diameter of the hexagonalcolumnar cluster 65 is smaller than an inner diameter of thecoil end 11 b on the upper end of thestator 11. - The
discharge pipe 63 pass through a side surface of theupper shell 50 and extends into thehermetical container 1, and thedischarge pipe 63 is located lower than a lower surface of thecluster 65. Asuction port 63 a of thedischarge pipe 63 as an open end in the hermetical container projects from an inner wall surface of thehermetical container 1. A hydrocarbon refrigerant which is a natural refrigerant is used as the working fluid. - The oil-separating operation will be explained. The working fluid including oil mist discharged from the compression mechanism into the
lower space 17 of the rotational motor passes through thenotches 11 a of thestator 11 and thegap 18 between thestator 11 and therotor 12, and moves into theupper space 19 of the rotational motor. At that time, since thegap 18 is extremely narrow, the rate of working fluid passing through thenotches 11 a of thestator 11 becomes extremely large. - The working fluid including the oil mist passing through the
notches 11 a of thestator 11 flows into theupper space 19 of the rotational motor along a wall surface of the hermetical container 1 (barrel shell 51 and the upper shell 50). Thereafter, theside surface 65 a of thecluster 65 disposed in the central portion of theupper shell 50 becomes an obstruction, and a downward flow toward the inner space of thecoil end 11 b along theside surface 65 a is generated. At that time, theside surface 65 a of thecluster 65 is opposed to the flow of the working fluid which flows from thenotches 11 a of thestator 11 and which includes the oil mist. Since theside surface 65 a of thecluster 65 is flat as compared with the tenth embodiment, especially the downward flow having no component in the circumferential direction toward the inner space of thecoil end 11 b is accelerated. Especially the polygonal side surface becomes an obstruction, and the effect for dropping the oil mist downward as the oil drop is enhanced. - Since the
rotor 12 of the rotational motor is rotational at high speed, a shearing force caused by theupper surface 12 b of therotor 12 is applied to the downward flow of the working fluid, and turning flow around the rotation center axis L is generated. At that time, since thecluster 65 is hexagonal columnar in shape which is symmetric wither respect to the rotation center axis L, the turning flow around thecluster 65 is further prone to be generated without being hindered, and the flow velocity of the turning flow is uniformly increased. Therefore, the working fluid and the refrigeration oil are separated by a centrifugal force caused by a difference in density therebetween, the oil mist moves toward the outer peripheral portion of the turning flow, and attaches to the inner wall surface of theupper shell 50 and becomes oil drop. The oil drop drops downward and is returned into theoil reservoir 16 formed in the bottom of thehermetical container 1. - The working fluid which flowed to the inner space of the
coil end 11 b on the upper end of thestator 11 and which includes the oil mist turns and flows in the inner space of thecoil end 11 b, and the oil mist is separated from the working fluid by the centrifugal force, the oil mist attaches to the inner peripheral surface of thecoil end 11 b and becomes oil drop and drops downward, and the oil drop is returned to theoil reservoir 16 formed in the bottom of thehermetical container 1. - The working fluid from which the oil mist is separated flows around a region close to the center of the turning flow which is away from an inner wall surface of the
hermetical container 1. Since thesuction port 63 a projects from the inner wall surface of thehermetical container 1 and thesuction port 63 a is inserted into this region in this embodiment, most of refrigeration oil is separated from the working fluid which flowed into thedischarge pipe 63 and discharged from the compressor. - Since the
discharge pipe 63 is lower than the lower surface of thecluster 65, the flow of the working fluid flowing into theupper space 19 is shut off by the side surface of thecluster 65, and the working fluid does not flow into thesuction port 63 a of thedischarge pipe 63 directly. Further, since thecluster 65 is disposed in the introducingterminal 64 such that a mounting gap is not generated and thus, the working fluid which flowed into theupper space 19 does not pass through the mounting gap between thecluster 65 and the introducingterminal 64. Therefore, the turning flow is not disturbed. - In this embodiment, like the tenth embodiment, the
hermetical container 1 is divided into three. Therefore, thedischarge pipe 63 and the introducingterminal 64 can be bonded to theupper shell 50 previously, or the compression mechanism and the rotational motor can be fitted to thebarrel shell 51. Therefore, the assembling operation of the compressor is facilitated. The outer diameter of thecluster 65 is set smaller than the inner diameter of thecoil end 11 b. Therefore, there is effect that the inner space of thecoil end 11 b is increased, and the turning flow of the inner space can easily be developed into turning flow around thecluster 65. - As described above, in this embodiment, an amount of the refrigeration oil delivered to the refrigeration cycle out from the compressor together with the working fluid can be reduced extremely. Therefore, the refrigeration oil is not attached to an inner wall of a heat exchanger tube of a heat exchanger, and it is possible to prevent the heat exchanging efficiency from being deteriorated. An amount of refrigeration oil in the
oil reservoir 16 can always be maintained constantly, and it is possible to enhance the reliability and efficiency of the compressor. - To prevent the global warming, it is proposed to employ, as a refrigerant, a hydrocarbon refrigerant which is a natural refrigerant having lower worming coefficient. If the hydrocarbon refrigerant is used as the working fluid, it is necessary to take the combustible nature of the refrigerant into consideration and to reduce the amount of refrigerant to be charged into the refrigeration cycle for enhancing the safety, and it is required to reduce the compressor in size. According to this embodiment, the oil-separating efficiency can be enhanced only by forming the
cluster 65 into the hexagonal columnar shape and by allowing thedischarge pipe 63 to pass through the side surface of theupper shell 50. This embodiment can easily be applied to the compressor with thehermetical container 1 having the outer diameter as extremely small as about 80 mm or less. Thus, according to this embodiment, even if the compressor is small in size using combustible hydrocarbon refrigerant, it is possible to easily reduce the amount of oil to be discharged. - The amount of oil can easily be reduced only by slightly changing the
cluster 65 and thedischarge pipe 63 and thus, it is possible to provide an extremely inexpensive compressor. - Although the
cluster 65 has the regular hexagonal columnar shape in the eleventh embodiment, any shapes (not shown) other than the regular hexagonal columnar can also be employed, and the same effect can be obtained only if the cluster is symmetric with respect to the center axis of the cluster, and the center axis of the cluster substantially coincides with the rotation center axis L of the rotational motor (i.e., rotor 12). - The compressor of this invention is used for a refrigeration cycle such as a refrigerator-freezer or an air conditioner. Carbon dioxide is preferably used as the working fluid.
Claims (15)
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-139771 | 2003-05-19 | ||
JP2003-139772 | 2003-05-19 | ||
JP2003139772A JP4029061B2 (en) | 2003-05-19 | 2003-05-19 | Compressor |
JP2003-139770 | 2003-05-19 | ||
JP2003139770A JP2004346740A (en) | 2003-05-19 | 2003-05-19 | Compressor |
JP2003139771A JP2004346741A (en) | 2003-05-19 | 2003-05-19 | Compressor |
PCT/JP2004/007133 WO2004102005A1 (en) | 2003-05-19 | 2004-05-19 | Compressor |
Publications (1)
Publication Number | Publication Date |
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US20070269328A1 true US20070269328A1 (en) | 2007-11-22 |
Family
ID=33458363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/556,357 Abandoned US20070269328A1 (en) | 2003-05-19 | 2004-05-19 | Antennas Array Calibration Arrangement and Method |
Country Status (2)
Country | Link |
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US (1) | US20070269328A1 (en) |
WO (1) | WO2004102005A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102477986A (en) * | 2010-11-26 | 2012-05-30 | 上海日立电器有限公司 | Rotor type compressor |
US20220224193A1 (en) * | 2019-06-13 | 2022-07-14 | Mitsubishi Electric Corporation | Compressor and air conditioner |
US20230120434A1 (en) * | 2020-03-30 | 2023-04-20 | Fujitsu General Limited | Rotary compressor |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6270080B1 (en) * | 2016-10-19 | 2018-01-31 | 三菱重工サーマルシステムズ株式会社 | Hermetic rotary compressor |
KR102328396B1 (en) * | 2017-03-20 | 2021-11-18 | 엘지전자 주식회사 | Hermetic compressor |
CN213450841U (en) * | 2020-09-04 | 2021-06-15 | 松下·万宝(广州)压缩机有限公司 | Take oil blocking mechanism and compressor of solidus subassembly |
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US4762471A (en) * | 1984-11-06 | 1988-08-09 | Kabushiki Kaisha Toshiba | Rotary compressor for refrigerant |
US6732542B2 (en) * | 2001-11-19 | 2004-05-11 | Sanyo Electric Co., Ltd. | Defroster of refrigerant circuit and rotary compressor |
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---|---|---|---|---|
JPS58170893A (en) * | 1982-03-31 | 1983-10-07 | Mitsubishi Electric Corp | Rotary compressor |
US4854831A (en) * | 1987-11-27 | 1989-08-08 | Carrier Corporation | Scroll compressor with plural discharge flow paths |
US4881879A (en) * | 1987-12-24 | 1989-11-21 | Tecumseh Products Company | Rotary compressor gas routing for muffler system |
US5597293A (en) * | 1995-12-11 | 1997-01-28 | Carrier Corporation | Counterweight drag eliminator |
JP4469094B2 (en) * | 2001-02-09 | 2010-05-26 | 東芝キヤリア株式会社 | Hermetic compressor |
-
2004
- 2004-05-19 WO PCT/JP2004/007133 patent/WO2004102005A1/en active Application Filing
- 2004-05-19 US US10/556,357 patent/US20070269328A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US4762471A (en) * | 1984-11-06 | 1988-08-09 | Kabushiki Kaisha Toshiba | Rotary compressor for refrigerant |
US6732542B2 (en) * | 2001-11-19 | 2004-05-11 | Sanyo Electric Co., Ltd. | Defroster of refrigerant circuit and rotary compressor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102477986A (en) * | 2010-11-26 | 2012-05-30 | 上海日立电器有限公司 | Rotor type compressor |
US20220224193A1 (en) * | 2019-06-13 | 2022-07-14 | Mitsubishi Electric Corporation | Compressor and air conditioner |
US20230120434A1 (en) * | 2020-03-30 | 2023-04-20 | Fujitsu General Limited | Rotary compressor |
US11933302B2 (en) * | 2020-03-30 | 2024-03-19 | Fujitsu General Limited | Rotary compressor |
Also Published As
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WO2004102005A1 (en) | 2004-11-25 |
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