KR20210147615A - Compressor - Google Patents

Abstract

The present invention relates to a compressor. More specifically, the compressor includes: a case including a discharge part for discharging a refrigerant, and an oil storage space for storing oil; a driving part including a stator combined with the inner circumference surface of the case to generate a rotating magnetic field, and a rotor housed in the stator to rotate the rotating magnetic field; a rotary shaft combined in the rotor in a direction becoming further from the discharge part; a compression part combined with the rotary shaft to be lubricated with the oil, and compressing the refrigerant to discharge the same in a direction becoming closer to the discharge part and in a direction becoming further from the discharge part; a muffler combined with the compression part, and guiding the refrigerant, which is discharged from the compression part in the direction becoming further from the discharge part, to the discharge part; and a transfer part provided to connect the muffler to the discharge part, and transferring the refrigerant or the oil discharged by the muffler to the discharge part. The transfer part can be provided on the outside of the case. Therefore, the present invention is capable of increasing the efficiency of refrigerant compression.

Description

Compressor {Compressor}

The present invention relates to a compressor. More particularly, it relates to a scroll compressor capable of bypassing the refrigerant compressed in the compression unit and delivering the refrigerant to the discharge unit.

In general, a compressor is a device applied to a refrigeration cycle (hereinafter, abbreviated as refrigeration cycle) such as a refrigerator or an air conditioner, and provides work necessary for heat exchange in the refrigeration cycle by compressing the refrigerant.

The compressor may be classified into a reciprocating type, a rotating seat type, a scroll type, etc. according to a method of compressing the refrigerant. Among them, the scroll compressor is a compressor in which a compression chamber is formed between the fixed lap of the fixed scroll and the orbiting lap of the orbiting scroll by engaging the orbiting scroll with the fixed scroll fixed in the inner space of the sealed container and rotating.

Compared to other types of compressors, since the scroll compressor is continuously compressed through an interlocking scroll shape, a relatively high compression ratio can be obtained, and the suction, compression, and discharge strokes of the refrigerant are smoothly performed to obtain a stable torque. For this reason, scroll compressors are widely used for refrigerant compression in air conditioners and the like.

Referring to Japanese Patent Publication No. 6344452, a conventional scroll compressor includes a case having an external appearance and having a discharge unit for discharging refrigerant, a compression unit fixed to the case to compress the refrigerant, and a compression unit fixed to the case to compress the refrigerant and a driving unit for driving the unit, wherein the compression unit and the driving unit are coupled to the driving unit and connected by a rotating shaft.

The compression unit includes a fixed scroll fixed to the case and having a fixed wrap, and an orbiting scroll including an orbiting wrap driven by being engaged with the fixed wrap by the rotation shaft. In such a conventional scroll compressor, the rotating shaft is eccentric, and the orbiting scroll is fixed to the eccentric rotating shaft and rotates. As a result, the orbiting scroll orbits (orbits) along the fixed scroll and compresses the refrigerant.

In such a conventional scroll compressor, the compression unit is provided under the discharge unit, and the driving unit is provided below the compression unit. In general, the rotating shaft has one end coupled to the compression unit and the other end passing through the driving unit.

In the conventional scroll compressor, since the compression unit is provided above the driving unit and close to the discharge unit, it is difficult to supply oil to the compression unit. There were downsides. In addition, the conventional scroll compressor has a problem in that efficiency and reliability are deteriorated due to tilting of the scroll because the action points of the gas force generated by the refrigerant in the compressor and the reaction force supporting the same do not match.

In order to solve this problem, referring to Korean Patent Application Laid-Open No. 10-20180124633 and FIG. 1(a), in recent years, the driving unit has a driving unit under the discharge unit, and a compression unit is located below the driving unit. Compressors appeared (aka, lower scroll compressors).

In the lower scroll compressor, a driving unit is provided closer to the discharge unit than the compression unit, and the compression unit is provided farthest apart from the discharge unit.

In such a lower scroll compressor, one end of the rotation shaft is connected to the driving unit, the other end is supported by the compression unit, so that the lower frame is omitted, and the oil stored in the oil storage space (p) under the case is directly transferred to the compression unit without passing through the driving unit. It had the advantage that it could be supplied. In addition, when the rotary shaft is connected through the compression part in the lower scroll compressor, the action points of the gas force and the reaction force coincide on the rotary shaft, thereby canceling the vibration or overturning moment of the scroll, thereby ensuring efficiency and reliability.

Referring to the left drawing of FIG. 1, the oil separation member is a filter type separation member (demister type or mesh type oil member, 610, 620) that induces collision between oil particles to separate the refrigerant and oil by a density difference could be applied. . The filter-type separation member may include a plate 610 having a through hole therein in the shape of a disk or cone, and a filter member 620 coupled to the through hole.

The plate 610 collects the oil and refrigerant that have passed through the driving unit 200 to the filter member 620, and then guides the oil separated from the filter member 620 back to the oil storage space p of the case. provided to do The filter member 620 is provided with a filter made of a porous material for contacting or passing oil and refrigerant guided along the plate 610 . Since the refrigerant is in a gaseous state, it passes through the filter member 620 as it is, but since the oil is in the state of fine droplets, it is adsorbed to the filter member 620 and grows into large droplets. Thereafter, it remains in the filter member 620 due to the density difference, and the remaining oil moves along the plate 610 by its own weight and is recovered into the oil storage space.

On the other hand, the more the oil collides with the filter member 620, the more it is recovered. Therefore, the faster the speed of the oil flowing into the filter member 620 or the greater the weight (or density) is, the more advantageous. However, when the speed of the oil is fast, it means that the speed of the refrigerant is fast, which means that the refrigerant is compressed to a higher pressure state, so that before and after the filter member 620 or the discharge part 121 . It may mean that the pressure difference before and after is very large. Accordingly, the oil adsorbed to the filter member 620 receives a force to be separated from the filter member 620 again by a pressure difference or pressure drop, thereby having an adverse effect of flowing out together with the refrigerant to the discharge unit 121 . .

In other words, in the filter-type separation member, when the compression unit 300 compresses the refrigerant at a high speed, the separation efficiency drops sharply. There is a disadvantage in that the separation efficiency sharply decreases.

In order to solve this problem, recently, an oil separation member to which a centrifugal separation method is applied as in Korean Patent Application Laid-Open No. 10-2018-0124636 has appeared. Referring to the right drawing of FIG. 1 , the oil member may be configured as a centrifugal separation member 630 coupled to the driving unit 200 and rotating together with the rotation shaft 230 or the rotor 220 .

The centrifugal separation member may generate centrifugal force to the oil particles by strongly rotating. Thereafter, the oil particles collide with each other and grow into large droplets, and since the oil of the large droplets receives a greater centrifugal force, they collide with the inner wall of the case to be separated from the refrigerant.

At this time, since the higher the speed, the greater the centrifugal force, so that when the compressor compresses the refrigerant at a high speed, the oil separation efficiency may be higher. Therefore, the centrifugal separation member is suitable for driving the compressor at high speed.

However, in the case of a scroll compressor equipped with a centrifugal separation member 630 as shown in the right diagram of FIG. 1 , the refrigerant and the oil discharged from the compression unit 300 are separated by the compression unit 300 and the driving unit 200 . It can reach the discharge part 121 only through penetration. Accordingly, there is a structural limitation in that the refrigerant and oil are rubbed against the compression unit 300 and the driving unit 200 to reduce the speed.

In addition, when the compressor is driven at a high speed, the refrigerant and the oil rub more strongly against the compression unit 300 and the driving unit 200 , thereby decelerating the speed.

As a result, since the centrifugal separation member 630 does not apply sufficient centrifugal force to the oil, the oil cannot be separated from the refrigerant and is discharged together with the refrigerant.

One of the various objects of the present invention is to provide a compressor capable of reducing frictional loss by delivering a compressed refrigerant to a discharge unit in a bypass method.

One of the various objects of the present invention is to provide a compressor in which a separate flow path for supplying the compressed refrigerant and oil directly to a separation unit installed to separate oil from the compressed refrigerant is installed.

A compressor according to exemplary embodiments of the present invention includes: a case including a discharge unit to which a refrigerant is discharged, and a storage space in which oil is stored; a compression unit coupled to the rotating shaft, lubricated with oil, compressing the refrigerant and discharging it in two different directions; a muffler coupled to the compression unit and guiding the refrigerant discharged in one of the two directions to the discharge unit; and a transport unit provided outside the case to communicate with the muffler and the discharge unit, and configured to move the refrigerant or oil discharged by the muffler to the discharge unit. a first compression unit disposed in the one of the two directions to compress the refrigerant and discharge the refrigerant in a direction away from the discharge unit; and a second compression unit disposed in the other direction opposite to the one direction among the two directions to compress the refrigerant and discharge it in a direction closer to the discharge unit. In this case, the refrigerant discharged by the first compression unit may be moved to the discharge unit through the muffler and the transport unit, and the refrigerant discharged by the second compression unit may be moved to the discharge unit through the driving unit. .

A compressor according to exemplary embodiments of the present invention includes: a case including a discharge unit to which a refrigerant is discharged, and a storage space in which oil is stored; a driving unit including a stator coupled to the inner circumferential surface of the case to generate a rotating magnetic field, and a rotor accommodated in the stator and rotated by the rotating magnetic field; a rotating shaft coupled in a direction away from the discharge unit in the rotor; a compression unit coupled to the rotation shaft and provided to be lubricated with the oil, compressing the refrigerant and discharging the refrigerant in a direction closer to the discharge unit and a direction away from the discharge unit; a muffler coupled to the compression unit and guiding the refrigerant discharged from the compression unit in a direction away from the discharge unit to the discharge unit; and a transport unit provided to communicate with the muffler and the discharge unit, and configured to move the refrigerant or oil discharged by the muffler to the discharge unit.

The compressor may further include a separation unit provided between the discharge unit and the driving unit to separate the oil from the cold medium guided to the discharge unit, wherein the transport unit is at least one of the separation unit and the discharge unit. It may be provided to supply the refrigerant or oil discharged by the muffler.

The compression unit and the driving unit may be provided so that the oil separated by the separation unit passes through and moves to the oil storage space.

The transport unit may include: a first pipe coupled to the muffler; a second pipe provided to communicate with the first pipe and extending from the outside of the case toward the discharge part; and a third pipe provided to communicate with the second pipe and coupled to the case.

The first pipe may pass through the case and be provided to be coupled to the muffler, and the third pipe may pass through the case to be coupled to the separation unit.

The muffler may include: a receiving body providing a space in which the refrigerant moves; and a coupling body extending from an outer circumferential surface of the receiving body to be coupled to the compression unit, and the receiving body may include an outlet hole through which the refrigerant is discharged to the first pipe.

A muffler recovery passage may be formed in the coupling body so that a portion of an outer circumferential surface of the coupling body is curved to recover the oil separated from the refrigerant into the storage space.

The outlet hole may be disposed to avoid the muffler recovery passage in the receiving body.

The transport unit may further include a discharge pipe extending from the end of the third pipe toward the inside of the separation unit through the case and through which the refrigerant is discharged to the separation unit, wherein the separation unit includes the discharge pipe It may include; a discharge pipe coupling portion that is penetrated by and coupled.

The discharge pipe coupling part may have a shape protruding from an outer wall of the separation part, and the discharge pipe may be coupled to the discharge pipe coupling part and the separation part in a radial direction.

The refrigerant or oil discharged from the discharge pipe may be injected toward the center of the separation unit.

The discharge pipe coupling portion may have a shape protruding from an outer wall of the separation unit, and the discharge pipe may be coupled to the discharge pipe coupling unit in a direction inclined with respect to a radial direction of the separation unit.

The refrigerant or oil discharged from the discharge pipe may be injected into a space between the center of the separation unit and an inner wall of the separation unit.

The compression unit may include a main frame through which the rotation shaft passes; a first compression unit disposed on one side of the main frame to compress the refrigerant and discharge it in a direction away from the discharge unit; and a second compression unit disposed on the other side opposite to the one side of the main frame to compress the refrigerant and discharge it in a direction closer to the discharge unit.

The first compression unit may include: a first orbiting scroll coupled to the rotating shaft and provided to orbitally move when the rotating shaft rotates; and a first fixed scroll provided to be engaged with the first orbiting scroll, and provided to receive the refrigerant and compress and discharge the refrigerant, wherein the second compression unit is coupled to the rotating shaft, a second orbiting scroll provided to orbitally move when the rotating shaft rotates; and a second fixed scroll that is provided to engage the second orbiting scroll and is provided to receive the refrigerant and compress and discharge the refrigerant.

The refrigerant discharged by the first compression unit may be moved to the discharge unit through the muffler and the transport unit, and the refrigerant discharged by the second compression unit may be moved to the discharge unit through the driving unit.

In the compressor according to exemplary embodiments of the present invention, fixed scrolls and orbiting scrolls may be disposed on both sides of the main frame, respectively, and accordingly, the amount of refrigerant compressed for the same time as compared to the conventional scroll compressor may be increased. , the refrigerant compression efficiency can be increased.

At this time, the refrigerant discharged from the fixed scroll provided at the upper portion of the main frame may be delivered to the discharge unit through the driving unit, and the refrigerant discharged from the fixed scroll provided at the lower portion of the main frame is bypassed. It can be transmitted to the discharge part through the friction loss can be reduced.

1 is a view for explaining the structure of a conventional compressor.
2 and 3 are diagrams for explaining the structure of a compressor according to exemplary embodiments of the present invention.
4 is a diagram for explaining a structure of a muffler included in a conventional compressor of the present invention and a structure of a muffler included in the compressor of the present invention.
5 and 6 are views for explaining a coupling structure of a transport unit and a separation unit according to exemplary embodiments of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, devices, and/or systems described herein. However, this is merely an example, and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terminology used in the detailed description is for the purpose of describing embodiments of the present invention only, and should in no way be limiting. Unless explicitly used otherwise, expressions in the singular include the meaning of the plural. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, acts, elements, some or a combination thereof, one or more other than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, acts, elements, or any part or combination thereof.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.

2 and 3 are diagrams for explaining the structure of a compressor according to exemplary embodiments of the present invention. More specifically, FIG. 2 is a cross-sectional view for explaining the structure of a compressor according to an exemplary embodiment of the present invention, and FIG. 3 is a flow path of refrigerant and oil compressed and discharged by a compression unit included in the compressor. It is a cross section for

Referring to FIG. 2 , the scroll compressor 10 according to exemplary embodiments of the present invention may be installed on a circuit of a refrigerant cycle including a condenser, an expansion valve, and an evaporator.

The scroll compressor 10 according to exemplary embodiments of the present invention includes a case 100 having a space in which a fluid is stored or flowing, and is coupled to an inner circumferential surface of the case 100 to rotate a rotating shaft 230 . It may include a driving unit 200 to be used, and a compression unit 300 provided to compress the fluid by being coupled to the rotation shaft 230 inside the case 100 .

Specifically, a discharge unit 121 through which the refrigerant is discharged may be provided at one side of the case 100 . The case 100 is provided in a cylindrical shape, the housing shell 110 for accommodating the driving unit 200 and the compression unit 300, is coupled to one end of the housing shell 110, the discharge unit 121 is provided It may include a discharge shell 120, and a blocking shell 130 coupled to the other end of the receiving shell 110 to seal the receiving shell (110).

The driving unit 200 may include a stator 210 for generating a rotating magnetic field, and a rotor 220 provided to rotate by the rotating magnetic field, and the rotating shaft 230 is connected to the rotor 220 . It may be coupled to rotate together with the rotor 220 .

A plurality of slots may be formed on the inner circumferential surface of the stator 210 in the circumferential direction, and a coil may be wound in the plurality of slots. The stator 210 may be fixed to the inner circumferential surface of the receiving shell 110 . The rotor 220 may be rotatably coupled inside the stator 210 by being coupled with a permanent magnet, and thus may be provided to generate rotational power. The rotation shaft 230 may be press-fitted to the center of the rotor 220 and coupled thereto.

The compression unit 300 may compress the refrigerant and discharge the refrigerant in two different directions. That is, the compression unit 300 compresses the refrigerant and discharges it in a direction away from the discharge unit 121 , and a first compression unit that compresses the refrigerant and approaches the discharge unit 121 . It may include a second compression unit provided to discharge the to, the first compression unit and the second compression unit may be respectively disposed on both sides of the main frame 310 to be described later. For example, when the discharge part 121 is provided on the upper part of the case 100 , the first compression part is provided on the lower part of the main frame 310 , and the second compression part is provided on the main frame 310 . ) may be provided on the top.

The compression unit 300 is coupled to the rotating shaft 230 and provided to engage with the first orbiting scroll 330, which is provided to orbitally move when the rotating shaft 230 rotates, and the first orbiting scroll 330. A first fixed scroll 320 provided to receive refrigerant and compress and discharge the refrigerant, is seated on the first fixed scroll 320 to accommodate the first orbiting scroll 330, and the rotating shaft 230 is A penetrating main frame 310, a second orbiting scroll 350 that is coupled to the rotating shaft 230 and provided to orbitally move when the rotating shaft 230 rotates, and is seated on the main frame 310 to make the second A second fixed scroll 340 provided to engage the orbiting scroll 350 and supplied with the refrigerant to compress and discharge the refrigerant. In addition, the compression unit 300 is provided between the main frame 310 and the first orbiting scroll 330 and between the main frame 310 and the second orbiting scroll 350, respectively, to provide the first orbiting scroll 330 and the second orbiting scroll. An Oldham ring 360 for inducing the orbiting motion of the orbiting scroll 350 may be further included.

As a result, in the scroll compressor 10 , the driving unit 200 is disposed between the discharge unit 121 and the compression unit 300 . In other words, the driving unit 200 may be provided on one side of the discharge unit 121 , and the compression unit 300 may be provided in a direction away from the driving unit 200 from the discharge unit 121 . For example, when the discharge unit 121 is provided on the upper portion of the case 100 , the compression unit 300 is provided under the driving unit 200 , and the driving unit 200 is provided on the discharge unit It may be provided between 120 and the compression unit 300 .

Accordingly, when oil is stored in the case 100 , the oil may be directly supplied to the compression unit 300 without passing through the driving unit 200 . In addition, since the rotation shaft 230 is coupled to and supported by the compression unit 300 , a lower frame that separately rotatably supports the rotation shaft may be omitted.

In exemplary embodiments, in the scroll compressor 10 of the present invention, the rotation shaft 230 penetrates not only the first orbiting scroll 330 but also the first fixed scroll 320 to form the first orbiting scroll 330 and the second orbiting scroll 330 . All of the first fixed scroll 320 may be provided in surface contact, and in addition, the rotating shaft 230 penetrates not only the second orbiting scroll 350 but also the second fixed scroll 340 to form a second orbiting scroll 350 and All of the second fixed scrolls 340 may be provided so as to be in surface contact.

Unlike the conventional scroll compressor and/or the conventional lower scroll compressor, the scroll compressor 10 of the present invention includes a pair on one side of the main frame 310 . A first fixed scroll 320 and a first orbiting scroll 330 are disposed, and a pair of second fixed scrolls 340 and a second orbiting scroll are disposed on the other side of the main frame 310 opposite to the one side ( 350) will be placed. For example, when the first fixed scroll 320 and the first orbiting scroll 330 are provided under the main frame 310, the second fixed scroll 340 and the second orbiting scroll 350 are It may be provided on the main frame 310 . When the first fixed scroll 320 and the first orbiting scroll 330 are provided at the lower part of the main frame 310, respectively, the first fixed scroll 320 and the first orbiting scroll 330 together with the lower compression scroll or It may be referred to as a first compression unit, and when the second fixed scroll 340 and the second orbiting scroll 350 are provided on the main frame 310, respectively, the second fixed scroll 340 and the second orbiting scroll 350 may also be referred to as an upper compression scroll or a second compression unit.

On the other hand, since the compression unit 300 is composed of a pair of first fixed scrolls 320 and first orbiting scrolls 330 and a pair of second fixed scrolls 340 and second orbiting scrolls 350, these Correspondingly, two outlets through which the refrigerant is discharged may also be formed. That is, the refrigerant compressed and discharged by the first fixed scroll 320 provided on one side of the main frame 310 is discharged through a first outlet (not shown) provided in the first fixed scroll 320 . It may be provided to be sprayed in a direction away from the discharge unit 121 , and the refrigerant compressed and discharged by the second fixed scroll 340 provided on the other side of the main frame 310 is a second fixed scroll 340 . ) may be provided to be injected in a direction close to the discharge unit 121 through a second discharge port (not shown) provided in the inside.

Of the compression part 300 , the main frame 310 includes a main mirror plate 311 provided on one side of the driving part 200 or a lower part of the driving part 200 , and the driving part on the inner circumferential surface of the main mirror plate 311 . A main side plate 312 extending in a direction away from 200 and a direction closer to the driving unit 200 to be seated on the first fixed scroll 320 and the second fixed scroll 340, respectively, and the main head plate It may include a main shaft shaft portion 318 extending from 311 to rotatably support the rotation shaft 230 .

A main hole 317 for guiding the refrigerant discharged from the first fixed scroll 320 to the discharge unit 121 may be further provided in the main head plate 311 or the main side plate 312 .

The compressor 10 of the present invention may further include a muffler 500 coupled to the outermost portion of the first fixed scroll 320 to provide a space for guiding the refrigerant to the discharge unit.

The muffler 500 moves away from the discharge unit 121 among surfaces of the first fixed scroll 320 so as to guide the refrigerant discharged from the first fixed scroll 320 to the discharge unit 121 . It may be provided to seal one surface provided in the direction.

On the other hand, the oil supplied to the compression unit 300 or the oil stored in the case 100 moves to the upper part of the case 100 together with the refrigerant as the refrigerant is discharged to the discharge unit 121 . can At this time, the oil has a higher density than the refrigerant and cannot move to the discharge unit 121 due to the centrifugal force generated by the rotor 220 , and is located on the inner wall of the discharge shell 110 and the receiving shell 120 . is attached Accordingly, in the scroll compressor 10 of the present invention, the driving unit 200 and the compression unit can recover the oil attached to the inner wall of the case 100 to the oil storage space of the case 100 or the blocking shell 130 . The unit 300 may further include a recovery passage on the outer circumferential surface.

The recovery flow path includes a driving return flow path 201 provided on the outer circumferential surface of the driving unit 200 , a compression recovery flow path 301 provided on the outer circumferential surface of the compression unit 300 , and an outer circumferential surface of the muffler 500 . It may include a muffler return passage 501 that is.

The driving return passage 201 may be provided with a part of the outer peripheral surface of the stator 210 depressed, and the compression recovery passage 301 may be provided with a part of the outer peripheral surface of the fixed scroll 320 depressed. In addition, the muffler recovery passage 501 may be provided in which a part of the outer peripheral surface of the muffler is depressed. The drive return passage 201, the compression return passage 301, and the muffler return passage 501 may communicate with each other to allow oil to pass therethrough.

FIG. 2 shows that the driving return passage 201 is provided with a part of the outer circumferential surface of the stator 210 recessed, but the concept of the present invention is not necessarily limited thereto. That is, as shown in FIG. 3 later, the driving recovery passage 201 may be provided between the stator 210 and the rotor 220 .

In addition, since the fixed scroll 320 is provided by being coupled to the receiving shell 110 , the refrigerant may be prevented from moving to the discharge unit 121 by being obstructed by the fixed scroll 320 . Accordingly, the fixed scroll 320 may further include a bypass hole 327 through which the refrigerant may pass through the fixed head plate 321 through the fixed scroll 320 . The bypass hole 327 may be provided to communicate with the main hole 317 . Accordingly, the refrigerant may pass through the compression unit 300 , pass through the driving unit 200 , and be discharged to the discharge hole 121 .

On the other hand, the compressor 100 according to an embodiment of the present invention may include a separation unit 600 provided to separate oil from the refrigerant supplied to the space between the driving unit 200 and the discharge unit 121 .

The separation unit 600 may be coupled to the driving unit 300 to rotate together with the rotation shaft 230 when the rotation shaft 230 rotates. Specifically, the separation unit 600 may be coupled to the rotation shaft 230 , and may be coupled to the rotation shaft 230 such that the rotation center of the separation unit 600 is the same as the rotation shaft 230 .

Since the separation unit 600 rotates at a high speed when the rotation shaft 230 rotates, it is possible to provide strong centrifugal force to the refrigerant and oil around the separation unit 600 . Since the density of the refrigerant is relatively smaller than that of oil, it may not be greatly affected by the centrifugal force generated by the separation unit 600 . That is, since the centrifugal force acting on the refrigerant is smaller than the pressure difference between the inside and the outside of the discharge unit 121 , the refrigerant may be discharged to the discharge unit 121 without being affected by the separation unit 600 . However, the oil is denser than the refrigerant, and it is easy to grow into large droplets when they collide with each other. Therefore, since the centrifugal force generated in the separation unit 600 is greater than that of the refrigerant, the oils collide with each other in the vicinity of the separation unit 600 and grow into droplets, collide with the case 100 to close the recovery passage. It can be returned to the storage space through

On the other hand, when the density of the oil that has passed through the separation unit 600 increases, it may not be discharged to the discharge unit 121 and may be stored in the separation unit 600 . The stored oil may be recovered by being discharged along the inner wall of the case 100 again by the centrifugal force of the separation unit 600 .

On the other hand, the faster the speed of the oil and the refrigerant, the greater the centrifugal separation effect generated in the separation unit (600). Accordingly, it may be advantageous as the speed of the oil and refrigerant supplied to the separation unit 600 increases. However, even if the speed of the oil and the refrigerant discharged from the compression unit 300 is high, the oil and the refrigerant pass through the bypass hole 327 and the main hole 317 of the compression unit 300 primarily may rub. In addition, the oil and the refrigerant may be rubbed secondarily between the stator 210 and the rotor 220 or while passing through the rotor 220 . As a result, energy may be lost in the process of friction between the oil and the refrigerant, and thus the speed may be reduced, and thus the separation efficiency in which the oil is separated from the refrigerant in the separation unit 600 may be reduced.

In addition, regardless of the presence of the separation unit 600 , the energy generated by sufficiently compressing the refrigerant in the compression unit 300 in the friction process with the compression unit 300 or the driving unit 200 provided inside the case As heat is lost, the performance of the compressor (COP, etc.) may be reduced.

To prevent this, the compressor 10 according to an embodiment of the present invention is provided outside the case 100 and a transport unit 900 that moves the refrigerant or oil discharged to the muffler 500 to the discharge unit 121 . ) may be further included.

The transport unit 900 may be provided to immediately communicate the muffler 500 and the case 100 . In other words, the transport unit 900 may have one end coupled to the muffler 500 and the other end coupled to the case 100 provided between the driving unit 200 and the discharge unit 121 . The transport unit 900 may be provided in the shape of a pipe having a hollow inside, or may be provided in the shape of a duct. That is, the transport unit 900 may be provided in any shape as long as it can deliver the oil and refrigerant to the case 100 in which the discharge unit 121 is located. Accordingly, the transport unit 300 may be provided to supply the refrigerant discharged from the muffler 500 to at least one of the separation unit 600 and the discharge unit 121 .

The refrigerant and oil compressed by the rotation of the rotary shaft 230 in the compression unit 300 are discharged toward the muffler 500, and the muffler 500 is coupled with the refrigerant through the bypass hole and the main hole. A portion of the oil may be supplied to the discharge unit 121 through the driving unit 200 . In addition, the refrigerant or oil discharged to the muffler 500 may move along the transport unit 900 to be supplied to the discharge unit 121 .

In this case, the velocity V2 of the oil and the refrigerant passing through the transport unit 900 may be faster than the velocity V1 of the refrigerant and the oil passing through the driving unit 200 . Accordingly, the oil and refrigerant passing through the transport unit 900 may be better separated in the separation unit 600 than the oil and refrigerant passing through the driving unit 200 . Accordingly, the oil separation efficiency is improved so that a larger amount of oil can be recovered to the oil storage space of the case 100 , and the amount of oil flowing into the discharge unit 121 can be reduced. Therefore, since the compression unit 300 can always be lubricated or cooled with a sufficient amount of oil, the stability and reliability of the compressor 10 can be increased.

In addition, the high speed of oil and refrigerant means less heat loss and friction loss. That is, the refrigerant supplied through the transport unit 900 may retain more energy. Accordingly, the refrigerant passing through the transport unit 900 may be more efficient than the refrigerant passing through the driving unit 200 .

As a result, if the transport unit 900 is installed in the compressor 10 , if necessary, the driving unit 200 or the compression unit 300 may have a flow path through which the refrigerant or oil is delivered toward the discharge unit 121 . It may not be installed. For example, the bypass hole 327 or the main hole 317 may be omitted. That is, the refrigerant compressed in the compression unit 300 may be discharged to the discharge unit 121 only through the transport unit 900 .

Of course, in order to achieve the effect of cooling the driving unit 200 and the compression unit 300 with a refrigerant or oil, that is, the bypass hole 327 or the main hole 317 may be maintained as it is.

The transport unit 900 may be provided outside the case 100 .

Specifically, the transport unit 900 is provided to communicate with a first pipe 910 coupled to the muffler 500 , and the first pipe 910 , and the discharge unit 121 from the outside of the case 100 . A second pipe 920 extending toward the , and a third pipe 9.0 provided to communicate with the second pipe 920 and coupled to the case 100 may be included. At this time, the first pipe 910 may be provided to penetrate the case 100 and be coupled to the muffler 500 , and the third pipe 930 may penetrate the case 100 to pass through the separation unit. It may be provided to be coupled to (600).

Referring to FIG. 3 , the refrigerant discharged by the first compression unit may move to the discharge unit 121 through the muffler 500 and the transport unit 900 , and is discharged by the second compression unit. The cooled refrigerant may pass through the driving unit 200 and move to the discharge unit 121 .

In this case, a flow path through which the refrigerant discharged by the first compression unit moves may be referred to as a first flow path P1 , and a flow path through which the refrigerant discharged by the second compression unit moves is a second flow path P2 . can be referred to as

On the other hand, when the density of the oil separated by the separation unit 600 increases and is not discharged to the discharge unit 121 and is stored in the separation unit 600, the stored oil is stored in the separation unit ( 600) may be discharged and recovered along the inner wall of the case 100 again by the centrifugal force.

In this case, a flow path through which the oil stored in the separation unit 600 moves along the inner wall of the case 100 may be referred to as a third flow path P3 .

In exemplary embodiments, the refrigerant discharged by the first compression unit is to be moved to the discharge unit 121 through the first flow path P1 passing through the muffler 500 and the transport unit 900 . The refrigerant discharged by the second compression unit may be moved to the discharge unit 121 through the second flow path P2 passing through the driving unit 200 . In one embodiment, the oil separated by the separation unit 600 is transferred to the storage space through the third flow path P3 passing through the driving unit 200 , the compression unit 300 and the muffler 500 . can be moved to

4 is a diagram for explaining a structure of a muffler included in a conventional compressor of the present invention and a structure of a muffler included in the compressor of the present invention.

Referring to the left drawing of FIG. 4, the muffler 500 included in the conventional lower scroll compressor extends from the outer peripheral surface of the receiving body 510 and the receiving body 510 to provide a space for the refrigerant to move to compress the refrigerant. It may include a coupling body 520 coupled to the compression unit, and the receiving body 510 includes a first muffler recovery path 501 for moving the oil separated from the separation unit to the oil storage space in which the oil is stored, and the and a second muffler return passage 502 for moving the refrigerant and oil compressed from the compression unit to the separation unit.

At this time, the first muffler return passage 501 has a shape in which a portion of the outer peripheral surface of the coupling body 520 is curved, and the second muffler return passage 502 has a shape in which a part of the surface of the coupling body 520 is penetrated. have.

Referring to the right drawing of FIG. 4 , the muffler 500 included in the twin scroll compressor 10 of the present invention may have a shape similar to that of the muffler 500 included in the conventional lower scroll compressor.

However, the muffler 500 of the present invention may include only the first muffler return passage 501 for moving the oil separated from the separation unit 600 to the oil storage space in which the oil is stored, and from the compression unit 300 . The second muffler recovery passage 502 for moving the compressed refrigerant and oil to the separation unit 600 may not be included.

That is, the compression unit 300, more specifically, the refrigerant and oil compressed from the first compression unit do not need to move to the separation unit 600 through the flow path provided inside the case 100, and the Since the compressor 10 further includes a transport unit 900 provided on the outside of the case 100 , the refrigerant and oil compressed from the compression unit 300 can move to the separation unit 600 through the transport unit 900 . , unlike the muffler 500 included in the conventional lower scroll compressor, the second muffler return passage 502 may not be included.

On the other hand, the receiving body 520 of the muffler 500 of the present invention may include an outlet hole (not shown) through which the refrigerant compressed from the compression unit 300 is discharged to the first pipe 910 of the transport unit 900 . Also, the outlet hole may be disposed to avoid the first muffler recovery passage 501 in the receiving body 510 .

As described above, in the compressor 10 according to exemplary embodiments of the present invention, fixed scrolls 320 and 340 and orbiting scrolls 330 and 350 may be disposed on both sides of the main frame 310, respectively. , thus, the amount of refrigerant compressed for the same time as compared to the conventional scroll compressor may increase, and the refrigerant compression efficiency may increase.

At this time, the refrigerant discharged from the second fixed scroll 340 provided on the upper portion of the main frame 310 may be delivered to the discharge unit 121 through the driving unit 200 , and the lower portion of the main frame 310 . The refrigerant discharged from the first fixed scroll 320 provided on the loss can be reduced.

5 and 6 are views for explaining a coupling structure of a transport unit and a separation unit according to exemplary embodiments of the present invention.

Referring to FIG. 5 , the transport unit 900 passes through the case 100 and extends from the end of the third tube 930 toward the inside of the separation unit 600 , and the refrigerant flows through the separation unit 600 . It may include a discharge pipe 935 discharged to the , and the separation unit 600 may include a discharge pipe coupling portion 605 that is coupled through the discharge pipe (935).

The discharge pipe coupling part 605 may have a shape protruding from the outer wall of the separation part 600 , and the discharge pipe 935 has a radius of the discharge pipe coupling part 605 and the separation part 600 . direction can be coupled. In other words, the discharge pipe 935 may extend to the inside of the separation unit 600 through the discharge pipe coupling part 605 , in which case the extending direction or the longitudinal direction of the discharge pipe 935 is the The radial direction of the separation unit 600 , that is, the direction toward the center of the separation unit 600 may be the same.

In example embodiments, the refrigerant and/or oil discharged from the discharge pipe 935 may be injected toward the center of the separation unit 600 .

Referring to FIG. 6 , the discharge pipe coupling part 605 may have a shape protruding from the outer wall of the separation part 600 , and the discharge pipe 935 may be separated from the discharge pipe coupling part 605 . It may be coupled in a direction inclined with respect to the radial direction of the part 600 .

In other words, the discharge pipe 935 may extend to the inside of the separation unit 600 through the discharge pipe coupling part 605 , in which case the extending direction or the longitudinal direction of the discharge pipe 935 is the It may be a direction inclined with respect to the radial direction of the separation unit 600 , that is, a direction inclined with respect to a direction toward the center of the separation unit 600 .

In example embodiments, the refrigerant and/or oil discharged from the discharge pipe 935 may be injected into a space between the center of the separation unit 600 and an inner wall of the separation unit 600 . Accordingly, the refrigerant and/or oil discharged from the discharge pipe 935 may obliquely collide with the inner wall of the separation unit 600, and may rotate along the inner wall of the separation unit 600, and , separation of the refrigerant and oil may be promoted by the rotation, and cooling of the driving unit 200 provided under the separation unit 600 may be increased.

Although various embodiments of the present invention have been described in detail above, those of ordinary skill in the art to which the present invention pertains will understand that various modifications are possible without departing from the scope of the present invention with respect to the above-described embodiments. . Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims described below as well as the claims and equivalents.

10: scroll compressor 100: case
110: receiving shell 120: exhaust shell
121: discharge unit 130: blocking shell
200: driving unit 210: stator
220: rotor 230: rotation shaft
300: compression unit 310: main frame
320: first fixed scroll 330: first orbiting scroll
340: second fixed scroll 350: second orbiting scroll
360: Oldham Ring 500: Muffler
510: receiving body 520: combined body
600: separation part 605: discharge pipe coupling part
900: Transport Department 910: Section 1
920: Section 2 930: Section 3
935: discharge pipe

Claims (16)

a case including a discharge unit through which the refrigerant is discharged, and a storage space in which oil is stored;
a driving unit including a stator coupled to the inner circumferential surface of the case to generate a rotating magnetic field, and a rotor accommodated in the stator and rotated by the rotating magnetic field;
a rotating shaft coupled in a direction away from the discharge unit in the rotor;
a compression unit coupled to the rotation shaft and provided to be lubricated with the oil, compressing the refrigerant and discharging the refrigerant in a direction closer to the discharge unit and a direction away from the discharge unit;
a muffler coupled to the compression unit and guiding the refrigerant discharged from the compression unit in a direction away from the discharge unit to the discharge unit; and
and a transport unit provided to communicate with the muffler and the discharging unit and moving the refrigerant or oil discharged by the muffler to the discharging unit;
The transport unit is a compressor provided outside the case. According to claim 1,
Further comprising; a separation unit provided between the discharge unit and the driving unit to separate the oil from the cold medium guided to the discharge unit;
The transport unit is provided to supply the refrigerant or oil discharged by the muffler to at least one of the separation unit and the discharge unit. 3. The method of claim 2,
The compression unit and the driving unit are provided so that the oil separated by the separation unit passes through and moves to the oil storage space. According to claim 1,
The transport unit,
a first pipe coupled to the muffler;
a second pipe provided to communicate with the first pipe and extending from the outside of the case toward the discharge part; and
A compressor comprising a third pipe provided to communicate with the second pipe and coupled to the case. 5. The method of claim 4,
The first pipe passes through the case and is provided to be coupled to the muffler, and
The third pipe penetrates the case and is provided to be coupled to the separation unit. 6. The method of claim 5,
The muffler is
a receiving body providing a space in which the refrigerant moves; and
a coupling body extending from the outer circumferential surface of the receiving body and coupled to the compression unit; and
The receiving body includes an outlet hole through which the refrigerant is discharged to the first pipe. 7. The method of claim 6,
A compressor having a muffler recovery passage provided in the coupling body so that a portion of an outer circumferential surface of the coupling body is curved so that the oil separated from the refrigerant is recovered to the storage space. 8. The method of claim 7,
The outlet hole is disposed to avoid the muffler recovery passage in the receiving body. 6. The method of claim 5,
The transport unit,
Further comprising; a discharge pipe extending from the end of the third pipe through the case toward the inside of the separation unit, and through which the refrigerant is discharged to the separation unit;
The discharge unit,
A compressor comprising a; a discharge pipe coupling portion penetrated by the discharge pipe and coupled. 10. The method of claim 9,
The discharge pipe coupling portion has a shape protruding from the outer wall of the separation portion, and
The discharge pipe is coupled to the discharge pipe coupling portion and the separation portion in a radial direction. 11. The method of claim 10,
The refrigerant or oil discharged from the discharge pipe is injected toward the center of the separation unit. 10. The method of claim 9,
The discharge pipe coupling portion has a shape protruding from the outer wall of the separation portion, and
The discharge pipe is coupled in a direction inclined with respect to the radial direction of the discharge pipe coupling portion and the separation portion. 13. The method of claim 12,
The refrigerant or oil discharged from the discharge pipe is injected into a space between the center of the separation unit and an inner wall of the separation unit. According to claim 1,
The compression unit,
a main frame through which the rotating shaft passes;
a first compression unit disposed on one side of the main frame to compress the refrigerant and discharge it in a direction away from the discharge unit; and
and a second compression unit disposed on the other side opposite to the one side of the main frame to compress the refrigerant and discharge it in a direction closer to the discharge unit. 15. The method of claim 14,
The first compression unit,
a first orbiting scroll coupled to the rotating shaft and provided to orbitally move when the rotating shaft rotates; and
a first fixed scroll provided to be engaged with the first orbiting scroll and provided to receive the refrigerant and compress and discharge the refrigerant; and
The second compression unit,
a second orbiting scroll coupled to the rotating shaft and provided to orbitally move when the rotating shaft rotates; and
and a second fixed scroll provided to engage the second orbiting scroll, and provided to receive the refrigerant and compress and discharge the refrigerant. 16. The method of claim 15,
The refrigerant discharged by the first compression unit moves to the discharge unit through the muffler and the transport unit, and
The refrigerant discharged by the second compression unit is moved to the discharge unit through the driving unit.

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