CN214499406U - Compressor - Google Patents

Abstract

The utility model relates to a compressor, the utility model discloses a: the compressor includes a housing, a motor section and a compressor section provided in the housing and operating a rotary shaft. A main frame is disposed between the power unit and the compression unit and supports the compression unit and the rotation shaft, a first oil recovery flow path extends in a thickness direction of a fixed scroll constituting the compression unit on an outer surface of the fixed scroll, a second oil recovery flow path extends in the thickness direction of the main frame on the outer surface of the main frame, and the first oil recovery flow path and the second oil recovery flow path are connected to each other. In this case, the first oil recovery flow path and the second oil recovery flow path are formed so as to avoid a fastening hole and a refrigerant discharge portion formed in the fixed scroll and the main frame, and at least one of the first oil recovery flow path and the second oil recovery flow path has different cross-sectional areas at upper and lower portions thereof.

Description

Compressor

Technical Field

The present invention relates to a compressor capable of separating refrigerant gas flowing to an upper portion and oil flowing to a lower portion in the compressor from each other.

Background

In general, a compressor is a device for generating high pressure or delivering high pressure fluid, and in the case of a compressor applied to a refrigeration cycle of a refrigerator, an air conditioner, or the like, compresses a refrigerant gas and delivers the gas to a condenser.

Among these compressors, the scroll compressor is configured such that a fixed scroll is fixed to an inner space of a casing, the fixed scroll engages with an orbiting scroll to perform an orbiting motion, and refrigerant gas is continuously sucked, gradually compressed, and discharged through a compression chamber continuously formed between a fixed wrap of the fixed scroll and an orbiting wrap of the orbiting scroll, and the above-described processes are repeated.

Recently, as provided in korean laid-open patent No. 10-2018 and 0083646 (patent document 1) and korean laid-open patent No. 10-2018 and 0115174 (patent document 2), a high pressure compressor of a lower compression type in which a compression portion composed of a fixed scroll and an orbiting scroll is located at a lower side of a motor portion which transmits power to orbit the orbiting scroll, and the compression portion directly receives refrigerant gas and is supplied to an upper space in a casing after being compressed, and then is discharged.

On the other hand, in the lower compression type high pressure compressor according to the above-described related art, there is a structure for separating the flow direction of the refrigerant gas and the oil. For example, a continuous communication groove is formed in the main frame and the outer surface of the fixed scroll coupled to the main frame, and oil moves downward through the communication groove and is collected into the lower oil storage space.

More precisely, the oil in the oil storage space is supplied to the compression portion, and then the oil remaining after lubrication in the compression portion and the oil mixed with the compressed refrigerant move further downward along the communication groove on the outer circumferential surface of the compression portion to be collected in the oil storage space.

However, some of the oil may not be moved to the oil storage space via the communication groove, but may be accumulated on the top surface of the compression portion. Therefore, there is insufficient oil in the oil storage space, so that the oil cannot be smoothly supplied to the compression part, and the compression part or the rotary shaft may be damaged. As described above, it is also very important to recover oil to the oil storage space in terms of reliability of the compressor, and thus it is necessary to guide such oil accumulated on the top surface of the compression part to the lower oil storage space.

However, in the main frame and the fixed scroll constituting the compression portion, there are many fastening holes for bolt connection and refrigerant passages for moving refrigerant gas, so it is difficult to sufficiently secure the width of the communication groove. Therefore, there is a problem in that oil cannot be smoothly recovered through the communication groove, and durability and compression efficiency of the compressor are reduced due to a decrease in lubrication performance of the compressor.

Documents of the prior art

Patent document 1: korean laid-open patent No. 10-2018-

Patent document 2: korean laid-open patent No. 10-2018-0115174

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to form a plurality of oil recovery grooves on the outer surfaces of a main frame and a fixed scroll, and ensure that the oil recovery grooves have as large a cross-sectional area as possible by making the oil recovery grooves avoid fastening holes and refrigerant passages, etc.

According to the features of the present invention for achieving the above object, the present invention includes a housing, an electric portion and a compression portion provided in the housing and operating a rotation shaft. A main frame is disposed between the power unit and the compression unit and supports the compression unit and the rotation shaft, a first oil recovery flow path extends in a thickness direction of a fixed scroll constituting the compression unit on an outer surface of the fixed scroll, a second oil recovery flow path extends in the thickness direction of the main frame on the outer surface of the main frame, and the first oil recovery flow path and the second oil recovery flow path are connected to each other. In this case, the first oil recovery flow path and the second oil recovery flow path are formed so as to avoid a fastening hole and a refrigerant discharge portion formed in the fixed scroll and the main frame, and at least one of the first oil recovery flow path and the second oil recovery flow path has different cross-sectional areas at upper and lower portions thereof.

And the second oil recovery flow path of the main frame is configured by a lower flow path connected to the first oil recovery flow path and an upper flow path connected to an upper side of the lower flow path and extending to a top surface of the main frame, the upper flow path and the lower flow path having different cross-sectional areas.

Further, a lower flow path and an upper flow path of the second oil recovery flow path formed at the main frame are respectively formed at both sides with reference to a parting line where an upper mold and a lower mold for manufacturing the main frame intersect.

And an upper portion and a lower portion of at least one of the first oil recovery flow path and the second oil recovery flow path have different left and right widths in a circumferential direction, or are recessed to different depths in a central direction of the compression portion.

Further, an upper flow path positioned at an upper portion of the second oil recovery flow path and a lower flow path positioned at a lower portion thereof are formed to have different recess depths with respect to a thickness direction of the main frame, thereby forming a step difference between the upper flow path and the lower flow path.

The size of the cross-sectional area of the first oil recovery flow path gradually changes along the thickness direction of the fixed scroll.

In addition, both side edges of the first oil recovery flow path are formed as inclined surfaces or curved surfaces with respect to the circumferential direction of the fixed scroll, and both side edges of the second oil recovery flow path are formed as inclined surfaces or curved surfaces with respect to the circumferential direction of the main frame.

The first oil recovery flow path is formed narrower than the second oil recovery flow path.

Further, the fastening hole of the main frame includes: a bolt fastening hole opened toward a top surface of the fixed scroll to be combined with the fixed scroll; and a guide coupling hole opened in a direction of a flow path guide coupled to an upper portion of the main frame to be coupled to the flow path guide, wherein a lower flow path of the second oil recovery flow path is formed to avoid the bolt fastening hole, and an upper flow path of the second oil recovery flow path is formed to avoid the guide coupling hole.

The first oil recovery passage is formed in only a partial region in the circumferential direction of the fixed scroll, and the first oil recovery passage is omitted in the remaining region, the second oil recovery passage is formed in only a partial region in the circumferential direction of the main frame, and the second oil recovery passage is omitted in the remaining region, and at least one or more of a refrigerant suction portion, an oil supply passage, and an intermediate pressure hole is formed in the remaining region.

Further, the first oil recovery flow path and the second oil recovery flow path are open to an inner surface of the casing that houses the compression part and the main frame, respectively, and form a continuous oil recovery passage with the inner surface of the casing.

The compressor according to the present invention as described above has the following effects.

In the present invention, the oil recovery flow path is formed continuously with each other on the outer surface of the compression portion of the compressor, but the sizes of the cross-sectional areas of the upper portion and the lower portion of the oil recovery flow path are formed to be different. In this way, the oil recovery flow path does not have a constant width, but the upper portion and the lower portion are formed differently based on the thickness direction according to the surrounding structure (the fastening hole, the refrigerant discharge hole, and the like), so that it is possible to ensure that the oil recovery flow path has as wide a width as possible. Therefore, there is an effect of more smoothly recovering oil inside the compressor, and there is an effect of improving the lubrication performance of the compressor and the efficiency of the compressor.

In addition, in the present invention, the oil recovery flow paths formed in the upper and lower portions of the outer surface of the compression part are different in size from each other with respect to a point (parting line) where molds for casting the compression part are separated from each other. Therefore, even if the oil recovery flow path is not separately processed in the compression section, the oil recovery flow path can be made to have as wide a width as possible in the process of casting the compression section.

In the present invention, the oil recovery flow path is formed only in a part of the region along the circumferential direction of the compression section, and the oil recovery flow path is omitted in the remaining region. A refrigerant suction portion, an oil supply flow path, an intermediate pressure hole, and the like are formed in the remaining region where the oil recovery flow path is omitted. Therefore, the oil recovery flow path can be made as wide as possible without hindering the molding of the refrigerant suction portion, the oil supply flow path, and the intermediate pressure hole, which are required for driving the compression portion.

Further, in the present invention, the oil recovery flow path is omitted at a portion where the refrigerant suction portion, the oil supply flow path, and the intermediate pressure hole required for driving the compression portion are formed, and thus the portion may serve as a mounting region for fixing the main frame. Therefore, the main frame can be firmly fixed to the inside of the casing of the compressor without being separated, so that the reliability and durability of the compressor can be improved.

Drawings

Fig. 1 is a sectional view illustrating an embodiment of a compressor according to the present invention.

Fig. 2 is a perspective view showing the structure of the compression unit, the main frame, and the rotary shaft that constitute one embodiment of the present invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is an exploded perspective view of the components shown in fig. 2.

Fig. 5 is an exploded perspective view of the components shown in fig. 2, shown from a different angle than fig. 4.

Fig. 6 is a bottom view showing a lower structure of a compression part constituting an embodiment of the present invention.

Fig. 7 is a plan view showing an upper structure of a main frame constituting an embodiment of the present invention.

Description of the reference numerals

10: a casing 20: electric drive unit

30: rotation shaft 40: compression part

41: fixed scroll 44: first oil recovery flow path

45: swirling disc 50: main frame

55: second oil recovery flow path 60: flow path guide

70: storage container

Detailed Description

In the following, some embodiments of the invention are explained in detail by means of exemplary drawings. Note that, when reference numerals are given to components in each drawing, the same reference numerals are given to the same components as possible even when the reference numerals are given to different drawings. In describing the embodiments of the present invention, when it is determined that specific descriptions of related known structures or functions will hinder understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. The above terms are only used to distinguish the above-mentioned components from other components, and the nature, order, sequence, and the like of the corresponding components are not limited by the above terms. When it is stated that a certain component is "connected", "coupled" or "connected" to another component, it is to be understood that the component may be directly connected or connected to the other component, but another component may be "connected", "coupled" or "connected" between the components.

According to the utility model discloses a compressor mainly includes: the casing 10, the electric portion 20, the compression portion 40, the main frame 50, and the rotary shaft 30, an oil recovery flow path C is formed on outer circumferential surfaces of the compression portion 40 and the main frame 50 so that oil can be recovered again to an oil storage space located at a lower side. In the present embodiment, since it is ensured that the oil recovery flow path C has a cross-sectional area as wide as possible, the recovery rate of oil is high. This structure will be explained again below.

First, the casing 10 forms an external appearance of the compressor. The casing 10 is formed of a cylindrical body 11 opened at the upper and lower sides. Meanwhile, the upper portion of the main body 11 of the casing 10, which is open, is closed by the upper case 13, and the portion of the main body 11, which is open to the lower side, is closed by the lower case 17.

At this time, the space in the upper case 13 is provided as a discharge space for discharging refrigerant gas together with the upper portion in the casing 10, and the space in the lower case 17 is an oil storage space (not denoted by reference numeral) for storing oil. A refrigerant discharge pipe 14 for discharging the refrigerant gas in the discharge space penetrates the upper case 13. For reference, a state where oil is stored in the oil storage space is shown in fig. 1.

Next, the motor part 20 is disposed inside the housing 10, and rotates the rotation shaft 30 by providing a driving force. The electric motor unit 20 is located below the discharge space in an upper space in the housing 10. The motor part 20 includes a stator 21 provided to be fixed to a circumferential side inside the casing 10, and a rotor 22 rotatably provided inside the stator 21.

Here, the stator 21 includes a stator core in which a plurality of layers are stacked and a coil wound around the stator core, and insulators 23 are provided on upper and lower sides of the stacked stator core, respectively, and the insulators 23 are wound around the coil to insulate the coil. The insulator 23 may be made of an insulating material such as synthetic resin.

The rotor 22 is formed of a hollow magnet having a substantially cylindrical shape, and is rotatably provided inside the stator 21. The rotation shaft 30 is coupled to the rotor 22 such that the rotor 22 can rotate together with the rotation shaft 30.

Meanwhile, an oil flow path 35 for supplying oil to each sliding portion is formed inside the rotary shaft 30, and an oil feeder (not denoted by reference numeral) is provided below the rotary shaft 30 so as to be immersed in the oil stored in the oil storage space in the casing 10, thereby transferring the oil in the oil storage space to the oil flow path 35. That is, when the oil feeder rotates along with the rotation of the rotary shaft 30, the oil in the oil storage space is sucked up along the oil flow path 35 and supplied to each sliding portion and the electric portion 20.

Next, the compression portion 40, which is a portion that compresses refrigerant gas, will be described. The compressing part 40 is located at a lower side of the electromotive part 20 in a lower space inside the casing 10. The compression part 40 includes a fixed scroll 41 fixed to the inside of the casing 10 and having a fixed wrap 41 ', and a orbiting scroll 45 having an orbiting wrap 48 engaged with the fixed wrap 41' of the fixed scroll 41 and configured to perform an orbiting motion by receiving a driving force of the rotation shaft 30.

Here, the fixed scroll 41 is located at a position relatively lower, and the swirling scroll 45 is located at a position relatively upper, and the fixed scroll 41 and the swirling scroll 45 face each other. Further, between the fixed scroll 41 and the orbiting scroll 45, compression chambers are continuously formed by the engagement between the respective scroll wrap portions formed on the surfaces facing each other.

A discharge port 41b for discharging the refrigerant gas compressed in the compression chamber to a lower space in the casing 10 is formed in the bottom surface of the fixed scroll 41. The discharge port 41b extends in the axial direction of the rotary shaft 30 and is open to the upper and lower portions of the fixed scroll 41. The centers of the fixed scroll 41 and the orbiting scroll 45 are opened so that the rotary shaft 30 penetrates the centers.

A refrigerant inflow portion (not denoted by reference numeral) is connected to an outer circumference of the fixed scroll 41 to communicate with each other. The refrigerant inflow portion is configured to penetrate the outer circumference of the cabinet 10, and is connected to receive refrigerant gas provided from the accumulator 70. That is, the refrigerant gas flowing into the refrigerant inflow portion via the accumulator 70 may flow into a compression chamber, which is a space between the fixed scroll 41 and the orbiting scroll 45.

Referring to fig. 2 and 4, the fixed scroll 41 is described in detail, and the fixed scroll 41 constituting the compression portion 40 is formed as a skeleton by a substantially disk-shaped fixed body. Further, a fixed scroll 41' is provided at the center of the fixed body.

A first refrigerant discharge portion 42 is provided in the fixed body of the fixed scroll 41. The first refrigerant discharge portion 42 is formed to penetrate the fixed scroll 41 in the thickness direction of the fixed scroll 41, and the refrigerant discharged after being compressed in the compression chamber can move upward by the first refrigerant discharge portion 42. The first refrigerant discharge portion 42 is provided with a plurality of first discharge holes 42'.

The first refrigerant discharge portion 42 is disposed near the outer edge of the fixed scroll 41. That is, the first refrigerant discharge portion 42 is located outside the compression chamber formed by the fixed scroll 41' and the swirl lap 48. Therefore, the first oil recovery flow path 44 described later needs to be kept away from the first refrigerant discharge portion 42.

The fixed scroll 41 is provided with a plurality of first fastening holes 43. The first fastening hole 43 is used for assembling the fixed scroll 41 and the main frame 50 to each other, and a fastening member such as a bolt is inserted into the first fastening hole 43 from a lower side. At least a portion of the bolt inserted into the first fastening hole 43 passes through the first fastening hole 43 and protrudes toward the main frame 50, and the protruding portion is inserted into a bolt fastening hole 58 of second fastening holes 57, 58 of the main frame 50, which will be described later.

As shown in fig. 4 and 5, the first fastening holes 43 are formed by penetrating the fixed scroll 41 in a thickness direction, and a plurality of the first fastening holes 43 are formed around an outer edge of the fixed scroll 41. In order to firmly assemble the fixed scroll 41 and the main frame 50 with each other, a plurality of first fastening holes 43 are required, but the plurality of first fastening holes 43 are disposed outside the fixed scroll 41 to avoid interference with the compression chamber.

A first oil recovery flow path 44 is formed on the outer peripheral surface of the fixed scroll 41. The first oil recollecting flow path 44 is a passage through which oil accumulated on the top surface of the main frame 50 can be recollected to the lower side, more precisely, to the oil storage space. The first oil recovery flow path 44 forms a continuous passage together with a second oil recovery flow path 55 of the main frame 50, which will be described later.

The first oil recovery flow path 44 extends in the thickness direction of the fixed scroll 41. The first oil recovery flow path 44 is formed in the vertical direction with reference to fig. 4. The first oil recovery flow path 44 may be formed in a hole shape near the outer peripheral surface of the fixed scroll 41, or may be recessed from the outer peripheral surface in a semicircular shape. In the present embodiment, the first oil recovery flow path 44 is formed on a side surface of the fixed scroll 41 and is opened in a direction facing the inner surface of the casing 10, where the fixed scroll 41 faces.

The first oil recovery flow path 44 is formed by being surrounded by two edges in the vertical direction where the first oil recovery flow path 44 intersects with the outer peripheral surface of the fixed scroll 41 and two edges formed by extending the two edges in the circumferential direction of the fixed scroll 41. Therefore, the width of the passage of the oil formed by the first oil recovery flow path 44 may be the cross-sectional area of the space formed between the first oil recovery flow path 44 and the inner circumferential surface of the casing 10.

The first oil recovery flow path 44 is formed so as to avoid the first fastening hole 43 and the first refrigerant discharge portion 42 formed in the fixed scroll 41. Since the fixed scroll 41 is provided with the plurality of first fastening holes 43 and the first refrigerant discharge portion 42, the first oil recovery flow path 44 is formed at a position avoiding these portions.

The first oil recovery flow path 44 is formed in plural on the outer peripheral surface of the fixed scroll 41 along the circumferential direction of the fixed scroll 41, but the first oil recovery flow path 44 may be formed in various shapes and sizes instead of the same shape and size. As shown in fig. 6, when viewed from the lower side of the fixed scroll 41, it can be seen that the first oil recovery flow path 44 located on the opposite right side in the clockwise direction through the first refrigerant discharge portion 42 is wider than the first oil recovery flow path 44 located in the 11 o' clock direction with reference to the drawing.

Further, the cross-sectional areas of the upper and lower portions of the first oil recovery flow path 44 may be formed to have different sizes based on the thickness direction of the fixed scroll 41. When viewing fig. 3 in which a portion a of fig. 2 is enlarged, it can be seen that the width of the first oil recovery flow path 44 of the fixed scroll 41 is formed to gradually increase toward the lower portion. The first fastening holes 43 and the like are arranged more densely than the bottom surface in the top surface of the fixed scroll 41, and therefore, in order to widen the first oil recovery flow path 44 as much as possible while avoiding such interference, the width of the first oil recovery flow path 44 is not constant.

Of course, the width of the first oil recovery flow path 44 may be gradually reduced toward the lower portion depending on the position of the first fastening hole 43 or the first refrigerant discharge portion 42 formed in the fixed scroll 41. Further, when the width of the first oil recovery flow path 44 of the fixed scroll 41 is formed to be gradually different in the thickness direction of the fixed scroll 41, it is easy to separate a mold member for forming the first oil recovery flow path 44 from a mold for casting the fixed scroll 41.

On the other hand, referring to fig. 6, the first oil recovery flow path 44 is formed only in a partial region along the circumferential direction of the fixed scroll 41. That is, the first oil recovery flow path 44 is not formed over the entire outer peripheral surface of the fixed scroll 41, but is formed only in a partial region, and the first oil recovery flow path 44 is omitted in the remaining region. In fig. 6, with the imaginary line as a reference, there is a portion K2 having the first oil recovery flow path 44 on one side, and the first oil recovery flow path 44 is not present in the remaining portion K1. This is to prevent interference with the refrigerant suction portion or the oil supply flow path 41a and the like by omitting the first oil recovery flow path 44 at the portion K1 where they are formed, while providing the first oil recovery flow path 44 at as many portions as possible.

Further, in the fixed scroll 41, since the first oil recovery flow path 44 is omitted at the portion K1 where the refrigerant suction portion, the oil supply flow path 41a, and the intermediate pressure hole required for driving the compression portion 40 are formed, this portion can be used as a mounting area for temporary fixing when the fixed scroll 41 is mounted or machined.

An orbiting scroll 45 is coupled to the fixed scroll 41. The swirl disc 45 is disposed in a space between the fixed scroll 41 and the main frame 50, and is connected to the rotation shaft 30 to compress refrigerant while rotating along with the rotation shaft 30.

A shaft fixing hole 46 is provided at the center of a scroll main body 45 constituting the orbiting scroll 45, the rotating shaft 30 is fixed to the shaft fixing hole 46, and an orbiting wrap 48 protrudes downward from the scroll main body 45. The swirl coil 48 faces the fixed scroll 41' of the fixed scroll 41 and forms a compression chamber with a variable volume therebetween.

A cross-shaped ring 59 for preventing the swirl coil 45 from self-passing is provided on the upper side of the swirl coil 45. The cross-ring 59 includes: a ring-shaped body of a substantially circular shape inserted into a rear surface of an end plate portion of the swirling disc 45; and first and second keys 59' and 59 "projecting upwardly and downwardly from the body. Since the cross ring 59 corresponds to a general structure, detailed description thereof will be omitted.

A main frame 50 is provided between the compression part 40 and the electromotive part 20. The main frame 50 functions to support the operation of the swirling coil 45 and the operation of the rotating shaft 30, and also functions to support the electric unit 20. The main frame 50 is framed by a support body 51 to cross between the compression part 40 and the electromotive part 20.

The support body 51 of the main frame 50 is provided with a second refrigerant discharge portion 52. The second refrigerant discharge portion 52 is a path through which the refrigerant gas compressed in the compression portion 40 moves upward, and is connected to the first refrigerant discharge portion 42. Therefore, the compressed refrigerant gas passes through the first refrigerant discharge portion 42 and the second refrigerant discharge portion 52, and is then delivered to the discharge space via the electric portion 20. The second refrigerant discharge portion 52 is provided with a plurality of second discharge holes 52'.

A shaft insertion hole 53 is provided at the center of the main frame 50, the rotation shaft 30 is inserted into the shaft insertion hole 53, and the support body 51 has a substantially circular disk shape centered on the shaft insertion hole 53. The support body 51 has a plurality of second fastening holes 57 and 58 in addition to the second refrigerant discharge portion 52. The second fastening holes 57, 58 include a guide coupling hole 57 for coupling with a flow path guide 60 coupled to an upper portion of the main frame 50 and a bolt fastening hole 58 for coupling with the fixed scroll 41.

The guide coupling hole 57 is opened upward from the top surface of the main frame 50 toward the flow path guide 60, and the bolt fastening hole 58 is opened from the bottom surface of the main frame 50 toward the top surface of the fixed scroll 41. The guide coupling hole 57 and the bolt fastening hole 58 may be respectively formed in plural numbers in the main frame 50.

The main frame 50 is provided with a second oil recovery flow path 55. The second oil recovery flow path 55 is a passage through which the oil accumulated on the top surface of the main frame 50 can be recovered to the lower side, and more precisely, to the oil storage space. The second oil recovery flow path 55 forms a continuous passage together with the first oil recovery flow path 44 of the fixed scroll 41 described above.

The second oil recovery flow path 55 extends in the thickness direction of the main frame 50. The second oil recovery flow path 55 is formed in the vertical direction with reference to fig. 4. The second oil recovery flow path 55 may be formed in a hole shape near the outer circumferential surface of the main frame 50, or may be recessed from the outer circumferential surface in a semicircular shape. In the present embodiment, the second oil recovery flow path 55 is formed at a side surface of the main frame 50 and is opened to a direction facing the inner surface of the casing 10, which the main frame 50 faces.

The second oil recovery flow path 55 is formed by being surrounded by two edges in the vertical direction where the second oil recovery flow path 55 intersects with the outer peripheral surface of the main frame 50 and two edges formed by extending the two edges in the circumferential direction of the main frame 50. Therefore, the width of the oil passage formed by the second oil recovery flow path 55 may be the cross-sectional area of the space formed between the second oil recovery flow path 55 and the inner circumferential surface of the casing 10.

The second oil recovery flow path 55 is formed so as to avoid the second fastening holes 57 and 58 and the second refrigerant discharge portion 52 formed in the main frame 50. Since the main frame 50 is provided with not only the guide coupling holes 57 constituting the second fastening holes 57 and 58 and the bolt fastening holes 58 for coupling with the fixed scroll 41 but also the second refrigerant discharge portion 52, the second oil recovery flow path 55 is formed at a position avoiding these portions.

The second oil recovery flow path 55 is formed in plural on the outer circumferential surface of the main frame 50 along the circumferential direction of the main frame 50, but the second oil recovery flow path 55 may be formed in various shapes and sizes instead of the same shape and size. As seen from the lower side of the main frame 50, as shown in fig. 7, it can be seen that the second oil recovery flow path 55 located on the opposite right side from the second refrigerant discharge portion 52 in the counterclockwise direction has a wider width with reference to the drawing than the second oil recovery flow path 55 located in the 6 o' clock direction.

As shown in fig. 3, such a second oil recovery flow path 55 forms a continuous path with the first oil recovery flow path 44, the continuous path extending in the direction of gravity (the direction of the arrow in fig. 2). Therefore, the oil accumulated in the upper portion of the main frame 50 continuously moves to the lower side via the second oil recovery flow path 55 and the first oil recovery flow path 44, and is finally collected into the oil storage space.

The cross-sectional areas of the upper and lower portions of the second oil recovery flow path 55 are formed to be different from each other with respect to the thickness direction of the main frame 50. In the present embodiment, the second oil recovery flow path 55 is composed of a lower flow path 55a and an upper flow path 55b, the lower flow path 55a is connected to the first oil recovery flow path 44, the upper flow path 55b is connected above the lower flow path 55a and extends to the top surface of the main frame 50, and the upper flow path 55b and the lower flow path 55a have different cross-sectional areas.

Referring to fig. 3, it can be seen that the cross-sectional area of the upper flow path 55b is larger in the lower flow path 55a and the upper flow path 55b constituting the second oil recovery flow path 55. The reason for making the sizes of the cross-sectional areas of the upper flow path 55b and the lower flow path 55a different in this way is to ensure that the second oil recovery flow path 55 has the widest possible width by making the upper flow path 55b and the lower flow path 55a not have a constant width and making the upper portion and the lower portion different from each other in the thickness direction depending on the surrounding structure (the second fastening holes 57 and 58, the second refrigerant discharge portion 52, and the like).

More specifically, as shown in fig. 5, the lower flow path 55a is formed at a position avoiding the bolt fastening hole 58 and the second discharge hole 52' provided at the bottom surface of the main frame 50, and as shown in fig. 4, the upper flow path 55b is formed at a position avoiding the guide coupling hole 57 and the second refrigerant discharge portion 52 provided at the top surface of the main frame 50. Therefore, the upper flow path 55b and the lower flow path 55a are made independently of each other, so that a width as wide as possible can be secured.

Further, the upper flow path 55b and the lower flow path 55a constituting the second oil recovery flow path 55 may be formed to have different lateral widths in the circumferential direction of the main frame 50, but the upper flow path 55b and the lower flow path 55a may be formed to have different recessed depths in the center direction of the main frame 50.

At this time, in the present embodiment, a point (parting line PL) where molds for casting the main frame 50 are separated from each other is located in the middle in the thickness direction of the main frame 50, and the upper flow path 55b and the lower flow path 55a may be formed to be different in size with respect to the parting line PL. Therefore, even if the second oil recovery flow path 55 is not separately processed in the main frame 50, the second oil recovery flow path 55 can be widened as much as possible in the process of casting the main frame 50.

As described above, in the present embodiment, in the lower flow path 55a and the upper flow path 55b constituting the second oil recovery flow path 55, the cross-sectional area of the upper flow path 55b is larger, and therefore the upper flow path 55b and the lower flow path 55a can form a step difference at a position where they meet each other. Referring to fig. 3, although there is a step between the upper flow path 55b and the lower flow path 55a, the lower flow path 55a and the first oil recovery flow path 44 do not have a step at the center thereof where they meet each other, but form a continuous plane. Therefore, the oil can naturally move in the direction of the first oil recovery flow path 44. Of course, the width of the upper flow path 55b may be smaller than that of the lower flow path 55a depending on the position and size of the second fastening holes 57 and 58 or the second refrigerant discharge portion 52 formed in the main frame 50.

On the other hand, referring to fig. 7, the second oil recovery flow path 55 is formed only in a partial region along the circumferential direction of the main frame 50. That is, the second oil recovery flow path 55 is not formed on the entire outer circumferential surface of the main frame 50 but is formed only in a partial region, and the second oil recovery flow path 55 is omitted in the remaining region. In fig. 7, with the imaginary line as a reference, there is a portion K2 having the second oil recovery flow path 55 on one side, and the second oil recovery flow path 55 is not present in the remaining portion K1. This is to provide the second oil recovery flow path 55 at as many portions as possible while preventing interference with the intermediate pressure hole (not shown) or the oil supply flow path 51a by omitting the second oil recovery flow path 55 at the portion K1 where these portions are formed.

Further, in the main frame 50, since the second oil recovery flow path 55 is omitted at the portion K1 where the oil supply flow path and the intermediate pressure hole required for driving the compression portion 40 are formed, the portion can be used as an installation area for temporary fixation when installing or machining the main frame 50.

A flow path guide 60 is provided at an upper portion of the main frame 50. The flow path guide 60 is provided to be fixed to the guide coupling hole 57 of the main frame 50 and to separate a flow portion of the refrigerant gas and a flow portion of the oil by a partition wall 64. In particular, the flow path guide 60 is formed in a ring shape having an opened inner portion, and is placed on and fixed to the top surface of the support main body 51 constituting the main frame 50.

Hereinafter, the function of the compressor according to the foregoing embodiment of the present invention will be described in more detail.

First, the operation of the compressor is controlled, and when electric power is supplied to the electric unit 20, the rotor 22 of the electric unit 20 rotates. Then, when such a rotor 22 rotates, a rotating shaft 30 provided to penetrate the center of the rotor 22 also rotates together with the rotor 22.

When the rotary shaft 30 rotates, the compression unit 40 operates to compress the refrigerant gas in the compression chamber. That is, when the rotary shaft 30 rotates, the swirl coil 45 eccentrically coupled to the lower end of the rotary shaft 30 performs a swirling motion from the axial center of the rotary shaft 30, and in the process, any one of the outer surfaces of the involute-type swirl coil part 48 formed in the swirl coil 45 gradually moves along the inner surface of the involute-type fixed scroll part 41' formed in the fixed scroll 41, thereby forming a continuous compression chamber and gradually compressing the refrigerant gas sucked into the corresponding compression chamber.

Meanwhile, when the refrigerant gas is compressed in the compression chamber between the fixed scroll 41' and the orbiting scroll 48, the refrigerant gas flows into a refrigerant inflow pipe connected to the fixed scroll 41. At this time, the refrigerant gas is forcibly sucked into the compression chamber from the accumulator 70 due to a differential pressure occurring due to a pressure formed inside the fixed scroll 41, and then flows in the compression chamber continuously formed between the fixed scroll 41' and the orbiting scroll 48 according to the orbiting motion of the orbiting scroll 45 while being gradually compressed.

The compressed refrigerant gas is discharged to the bottom of the compression unit 40 through the discharge port 41b of the fixed scroll 41. At this time, a discharge cap is provided at the bottom of the compression portion 40, and thus the refrigerant gas discharged after passing through the discharge port 41b is stored in the discharge cap.

The refrigerant gas discharged into the discharge cap passes through the first refrigerant discharge portion 42 of the fixed scroll 41 and the second refrigerant discharge portion 52 of the main frame 50 in this order, and is then supplied to the space in the flow path guide 60. Subsequently, the refrigerant gas moves upward via the electromotive part 20, and is finally discharged through the discharge pipe 14.

At this time, as described above, in the process of compressing and discharging the refrigerant gas, the oil feeder rotates along with the rotation of the rotation shaft 30, and the oil stored in the oil storage space is sucked up along the oil flow path 35 inside the rotation shaft 30 and sprayed to the respective sliding portions and the electromotive part 20.

Then, the oil sprayed to the sliding portion and the electromotive portion 20 flows down along the inner wall surface of the casing 10, and the inflow of the refrigerant gas is blocked by the flow path guide 60 and the airtight member (not shown) at the portion where the oil flows, so that the oil can be smoothly recovered.

Observing the oil recovery process, the oil is collected in the inner space of the flow path guide 60, i.e., the space corresponding to the upper portion of the main frame 50, then moves to the space between the main frame 50 and the inner surface of the casing 10, and then moves downward via the second oil recovery flow path 55 and the first oil recovery flow path 44.

At this time, the first oil recovery flow path 44 and the second oil recovery flow path 55 are formed to have as large an area as possible in the fixed scroll 41 and the main frame 50, respectively, and therefore, such recovery of oil can be smoothly performed. In particular, in the present embodiment, the sizes of the cross-sectional areas of the upper portion and the lower portion are formed to be different in the first oil recovery flow path 44 and the second oil recovery flow path 55. In this way, the first oil recovery flow path 44 and the second oil recovery flow path 55 do not have a constant width, but the upper portion and the lower portion are formed differently based on the thickness direction according to the surrounding structure (the fastening hole, the refrigerant discharge hole, and the like), so that it is possible to ensure that the oil recovery flow path C has as wide a width as possible.

Also, in the present embodiment, the oil recovery flow path C is formed in only a part of the regions in the circumferential direction of the fixed scroll 41 and the main frame 50, respectively, and is omitted in the remaining regions. A refrigerant suction portion, oil supply flow paths 41a, 51a, an intermediate pressure hole, and the like are formed at the remaining region where the oil recovery flow path C is omitted. Therefore, the oil recovery flow path C can be made as wide as possible without hindering the molding of the refrigerant suction portion, the oil supply flow paths 41a, 51a, and the intermediate pressure hole, which are required to drive the compression portion 40.

In the above, all the structural elements constituting the embodiments of the present invention are described as being combined into one or being operated together, but the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, one or a plurality of components may be selectively combined and operated. In addition, the above terms "including", "constituting" or "having" and the like mean that corresponding structural elements may be included unless otherwise specifically stated, and thus it should be understood that other structural elements may be further included without excluding other structural elements. Unless defined otherwise, all terms including technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art. Terms commonly used, such as terms defined in dictionaries, should be interpreted as having a meaning that is consistent with the context of the relevant art and should not be interpreted in an ideal or excessive form unless explicitly defined in the present invention.

The above description is only an example of the technical idea of the present invention, and a person of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential features of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of the present invention should be construed by the appended claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (11)

1. A compressor, comprising:

a housing;

a motor unit disposed in the housing and operating a rotary shaft;

a compression unit located at the bottom of the electric unit in the housing and operated by a rotary shaft to compress refrigerant gas; and

a main frame positioned between the power unit and the compression unit and supporting the compression unit and the rotation shaft,

a first oil recovery flow path extending in a thickness direction of the fixed scroll on an outer surface of the fixed scroll constituting the compression portion, a second oil recovery flow path extending in the thickness direction of the main frame on an outer surface of the main frame, and the first oil recovery flow path and the second oil recovery flow path being connected to each other,

the first oil recovery flow path and the second oil recovery flow path are formed so as to avoid a fastening hole and a refrigerant discharge portion formed in the fixed scroll and the main frame, and at least one of the first oil recovery flow path and the second oil recovery flow path has different cross-sectional areas at upper and lower portions thereof.

2. The compressor of claim 1,

the second oil recovery flow path of the main frame is configured by a lower flow path connected to the first oil recovery flow path and an upper flow path connected above the lower flow path and extending to a top surface of the main frame, the upper flow path and the lower flow path having different cross-sectional areas.

3. The compressor of claim 1,

the lower flow path and the upper flow path of the second oil recovery flow path formed at the main frame are respectively formed at both sides with reference to a parting line where an upper mold and a lower mold for manufacturing the main frame intersect.

4. The compressor of claim 1,

an upper portion and a lower portion of at least one of the first oil recovery flow path and the second oil recovery flow path have different left and right widths in a circumferential direction, or are recessed to different depths in a central direction of the compression portion.

5. The compressor of claim 1,

an upper flow path positioned at an upper portion of the second oil recovery flow path and a lower flow path positioned at a lower portion thereof are formed to have different recess depths with respect to a thickness direction of the main frame, thereby forming a step difference between the upper flow path and the lower flow path.

6. The compressor of claim 1,

the size of the cross-sectional area of the first oil recovery flow path gradually changes along the thickness direction of the fixed scroll.

7. The compressor of claim 1,

both side edges of the first oil recovery flow path are formed as inclined surfaces or curved surfaces with reference to the circumferential direction of the fixed scroll, and both side edges of the second oil recovery flow path are formed as inclined surfaces or curved surfaces with reference to the circumferential direction of the main frame.

8. The compressor of claim 1,

the first oil recovery flow path is formed narrower than the second oil recovery flow path.

9. The compressor of claim 1,

the fastening hole of the main frame includes:

a bolt fastening hole opened toward a top surface of the fixed scroll to be combined with the fixed scroll; and

a guide coupling hole opened in a direction of a flow path guide coupled to an upper portion of the main frame to be coupled with the flow path guide,

the lower flow path of the second oil recovery flow path is formed so as to avoid the bolt fastening hole, and the upper flow path of the second oil recovery flow path is formed so as to avoid the guide coupling hole.

10. The compressor of claim 1,

the first oil recovery flow path is formed in only a partial region in a circumferential direction of the fixed scroll, and the first oil recovery flow path is omitted in a remaining region, the second oil recovery flow path is formed in only a partial region in a circumferential direction of the main frame, and the second oil recovery flow path is omitted in a remaining region in which at least one or more of a refrigerant suction portion, an oil supply flow path, and an intermediate pressure hole is formed.

11. The compressor of claim 1,

the first oil recovery flow path and the second oil recovery flow path are open to an inner surface of the casing that houses the compression part and the main frame, respectively, and form a continuous oil recovery passage with the inner surface of the casing.

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