KR102379939B1 - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor, comprising: a casing having an inner space; a driving unit provided in the inner space of the casing and generating a rotational force; and a compression unit including a orbiting scroll receiving rotational force from the driving unit to perform a rotational motion and a non-orbiting scroll forming a compression chamber together with the orbiting scroll, wherein the compression unit may be accommodated in the inner space of the casing there is. Thereby, noise and vibration generated in the compression chamber are prevented from being emitted to the outside, cost and weight are reduced, tolerance management is facilitated, and refrigerant and oil leakage can be prevented. In addition, the oil recovery passage for recovering oil separated from the refrigerant discharged from the compression chamber includes a first passage hole communicating with the collection space and a second passage hole communicating with the first passage hole, the collection space and the first passage hole As the first sealing member for sealing the communication portion of the passage hole and the second sealing member for sealing the communication portion between the first passage hole and the second passage hole are provided, leakage of oil from the oil return passage can be prevented. .

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor, comprising a non-orbiting scroll and an orbiting scroll that forms a compression chamber together with the non-orbiting scroll and orbits the non-orbiting scroll with respect to the non-orbiting scroll; It relates to a scroll compressor that makes it possible.

In general, an air conditioning device (Air Conditioning; A/C) for heating and cooling an interior is installed in a vehicle. Such an air conditioner includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant introduced from an evaporator into a high-temperature and high-pressure gaseous refrigerant and sends it to a condenser as a configuration of a cooling system.

There are two types of compressors: a reciprocating type for compressing a refrigerant according to a reciprocating motion of a piston, and a rotary type for performing compression while rotating. The reciprocating type includes a crank type that transmits to a plurality of pistons using a crank depending on the transmission method of the drive source, and a swash plate type that transmits to a rotating shaft with a swash plate installed. There is a scroll expression using orbiting scrolling and non-orbiting scrolling.

Scroll compressors are widely used for refrigerant compression in air conditioners because of the advantages of obtaining a relatively high compression ratio compared to other types of compressors and obtaining a stable torque by smoothly connecting refrigerant suction, compression, and discharge strokes.

FIG. 1 is a cross-sectional view illustrating a conventional scroll compressor, and FIG. 2 is an enlarged cross-sectional view of a compression unit in the scroll compressor of FIG. 1 .

1 and 2, in the conventional scroll compressor, a center housing 11 in which a main frame 112 is formed, a front housing 12 fastened to the center housing 11, and the main frame ( 112), a non-orbiting scroll 32 fastened to the center housing 11 from the opposite side of the front housing 12, and an orbiting scroll interposed between the main frame 112 and the non-orbiting scroll 32 (31) and a rear housing (13) fastened to the non-orbiting scroll (32) from the opposite side of the orbiting scroll (31) with respect to the non-orbiting scroll (32).

The center housing 11 and the front housing 12 form a space in which the driving unit 2 generating a rotational force is accommodated.

The driving unit 2 includes a stator 21 , a rotor 22 rotated by interaction with the stator 21 , and a rotating shaft 23 fastened to the rotor 22 .

The rotating shaft (23) passes through the main frame (112) and an eccentric portion formed at an end of the rotating shaft (23) is inserted into the boss portion of the orbiting scroll (31).

The orbiting scroll (31) forms a compression chamber (C) together with the non-orbiting scroll (32), receives rotational force from the driving unit (2), and rotates with respect to the non-orbiting scroll (32) to release refrigerant. compress

The refrigerant compressed in the compression chamber (C) is discharged to the outside of the compression chamber (C) through a discharge port 323 formed in the non-orbiting scroll (32).

The discharge port 323 is opened toward the rear housing 13 .

The rear housing 13 includes a discharge space 133 in which the refrigerant discharged from the discharge port 323 is accommodated, and a collection space 134 in which oil separated from the refrigerant in the discharge space 133 is collected.

The discharge space 133 communicates with a discharge pipe (not shown) that guides the refrigerant to the outside of the scroll compressor, and the collection space 134 recovers the oil collected in the collection space 134 to the inside of the scroll compressor. It is connected to the oil return passage (4).

The oil return passage 4 is formed by communicating with a plurality of segmented passage holes. That is, the oil return passage 4 is formed in the first passage hole 41 formed in the non-orbiting scroll 32 and communicating with the collection space 134 and the center housing 11, and the first passage and a second channel hole 42 communicating with the ball 41 . Accordingly, the oil in the collection space 134 is recovered through the first passage hole 41 and the second passage hole 42 .

However, in such a conventional scroll compressor, the non-orbiting scroll 32 forms a part of the casing 1 forming the exterior of the compressor. That is, the casing 1 is formed of the front housing 12 , the center housing 11 , the non-orbiting scroll 32 , and the rear housing 13 . Accordingly, noise and vibration generated in the compression chamber C are transmitted to the outside through the non-orbiting scroll 32, which is disadvantageous in terms of noise and vibration. And, as the outer diameter of the non-orbiting scroll 32 is formed to have a size corresponding to that of the center housing 11 and the rear housing 13, the outer diameter of the non-orbiting scroll 32 is significantly increased, so that the non-orbiting scroll There was a problem in that the cost and weight of (32) were increased. In addition, the non-orbiting scroll 32 is engaged with the center housing 11 and the rear housing 13 away from the predetermined position in the turning radial direction, so that tolerance management is difficult. And, the divided surface of the casing (1) (between the front housing (12) and the center housing (11), between the center housing (11) and the non-orbiting scroll (32), and the non-orbiting scroll (32) As the rear housing 13) is formed in plurality, there is a high possibility that refrigerant and oil may leak through the divided surfaces.

In addition, there is a problem in that oil leaks from the oil return passage 4 (more precisely, a communication portion between the first passage hole 41 and the second passage hole 42 ).

Accordingly, the present invention provides a scroll compressor capable of preventing noise and vibration generated in a compression chamber from being emitted to the outside, reducing cost and weight, facilitating tolerance management, and preventing refrigerant and oil leakage to do that for that purpose.

Another object of the present invention is to provide a scroll compressor capable of preventing oil from leaking from an oil recovery passage.

The present invention, to achieve the object as described above, a casing having an inner space; a driving unit provided in the inner space of the casing and generating a rotational force; and a compression unit including a orbiting scroll receiving rotational force from the driving unit to perform a rotational motion and a non-orbiting scroll forming a compression chamber together with the orbiting scroll, wherein the compression unit is accommodated in the inner space of the casing It provides a scroll compressor characterized in that.

The casing may include a center housing in which a main frame supporting the orbiting scroll is formed; a front housing coupled to the center housing to form a first space in which the driving unit is accommodated; and a rear housing that is fastened to the center housing on the opposite side of the front housing with respect to the main frame to form a second space in which the compression unit is accommodated, wherein the compression unit overlaps the center housing in a turning radius direction. can be formed.

The non-orbiting scroll includes a disk-shaped non-orbiting mirror plate portion; and a non-orbiting lap protruding from one circular surface of the non-orbiting mirror plate portion to mesh with the orbiting lap of the orbiting scroll, wherein the non-orbiting mirror plate part may be supported on an inner circumferential surface of the center housing.

The center housing may include an outer wall portion formed in an annular shape, and a seating groove in which the non-orbiting mirror plate portion is seated and a receiving groove in which the non-orbiting wrap is accommodated may be formed on an inner circumferential surface of the outer wall portion.

The seating groove may be formed so that when the non-orbiting mirror plate part is seated in the seating groove, the center of the non-orbiting scroll and the center of the orbiting motion of the orbiting scroll are coaxially aligned.

The seating groove may be engraved from one end surface of the outer wall portion opposite to the rear housing, and the receiving groove may be engraved from the seating groove.

In the seating groove, a depth of the seating groove may be the same as a depth of the non-orbiting mirror plate portion or may be formed to be deeper than a depth of the non-orbiting mirror plate portion.

The non-orbiting mirror plate portion may be formed so that an outer diameter of the non-orbiting mirror plate portion is greater than an inner diameter of the seating groove and smaller than an outer diameter of the outer wall portion.

The receiving groove may have an inner diameter of the receiving groove smaller than an inner diameter of the seating groove.

The non-orbiting mirror plate portion may be supported on a stepped portion formed by the seating groove and the receiving groove.

The rear housing may be fastened to one front end surface of the center housing, and may be in contact with the other circular surface of the non-orbiting mirror plate part, which is a surface opposite to the one circular surface of the non-orbiting mirror plate part.

A discharge space through which the refrigerant compressed by the compression unit is discharged and a collection space that communicates with the discharge space and collects oil separated from the refrigerant in the discharge space are formed in the rear housing; A first passage hole communicating with the collecting space is formed in the center housing, a second passage hole communicating with the first passage hole is formed on a stepped portion of the center housing, and the collecting space is formed between the rear housing and the non-orbiting mirror plate portion. A first sealing member for sealing a communication portion between the first passage hole and the first passage hole is interposed, and a second sealing member for sealing the communication portion between the first passage hole and the second passage hole is interposed between the stepped portion and the non-orbiting mirror plate portion. A member may be interposed.

The first sealing member is formed to extend along a circumferential direction of a communication portion between the collection space and the first flow hole, and the second sealing member has a circumferential direction of the communication portion between the first flow hole and the second flow hole. It may be formed to extend along.

A first sealing member insertion groove into which the first sealing member is inserted is formed in at least one of the rear housing and the non-orbiting mirror plate portion, and the second sealing member is provided in at least one of the stepped portion and the non-orbiting mirror plate portion. A second sealing member insertion groove to be inserted may be formed.

A pressure reducing means for reducing the pressure of oil flowing in from the first channel hole may be formed in the second channel hole.

In the scroll compressor according to the present invention, the compression unit including the orbiting scroll and the non-orbiting scroll is accommodated in the inner space of a casing forming the exterior of the scroll compressor, thereby preventing noise and vibration generated in the compression chamber from being emitted to the outside. In addition, it is possible to reduce cost and weight, facilitate tolerance management, and prevent refrigerant and oil leakage.

In addition, the oil return passage for recovering oil separated from the refrigerant discharged from the compression chamber includes a first passage hole communicating with the collection space and a second passage hole communicating with the first passage hole, and the collection space and the first passage As the first sealing member for sealing the communication portion of the ball and the second sealing member for sealing the communication portion between the first passage hole and the second passage hole are provided, it is possible to prevent oil from leaking from the oil return passage.

1 is a cross-sectional view showing a conventional scroll compressor;
2 is an enlarged cross-sectional view of a compression unit in the scroll compressor of FIG. 1;
3 is a cross-sectional view illustrating a scroll compressor according to an embodiment of the present invention;
4 is an enlarged cross-sectional view of a compression unit in the scroll compressor of FIG. 3;
5 is an enlarged cross-sectional view of an oil return passage in the scroll compressor of FIG. 3;
6 is a perspective view of FIG. 5 .

Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view illustrating a scroll compressor according to an embodiment of the present invention, FIG. 4 is an enlarged cross-sectional view of a compression unit in the scroll compressor of FIG. 3, and FIG. 5 is an oil return flow path in the scroll compressor of FIG. It is an enlarged cross-sectional view, and FIG. 6 is a perspective view of FIG. 5 .

As shown in these drawings, the scroll compressor according to an embodiment of the present invention includes a casing 1 having an inner space, a driving unit 2 provided in the inner space of the casing 1 and generating a rotational force, and the A compression unit (3) comprising an orbiting scroll (31) that rotates by receiving rotational force from the driving unit (2) and a non-orbiting scroll (32) that forms a compression chamber (C) together with the orbiting scroll (31); An oil return passage (4) for recovering oil separated from the refrigerant discharged from the compression unit (3) into the inner space of the casing (1) and the oil passing through the oil return passage (4) to depressurize the oil It may include a plurality of pressure reducing means (51, 52) formed in the recovery passage (4).

The casing (1) includes a center housing (11) in which a main frame (112) supporting the orbiting scroll (31) is formed, and a first space (11) fastened to the center housing (11) to accommodate the driving unit (2) ( A second space in which the compression part 3 is accommodated by being fastened to the center housing 11 from the opposite side of the front housing 12 with respect to the front housing 12 and the main frame 112 forming S1). It may include a rear housing 13 forming (S2).

Here, the front housing 12 side direction (left direction in FIG. 3 ) with respect to the center housing 11 is referred to as the front, and the rear housing 13 side direction ( FIG. 3 ) side direction with respect to the center housing 11 . 3 phase right direction) is called rear, one direction perpendicular to the front and rear (upward direction in FIG. 3 ) is called upward, and the opposite direction to the top (bottom direction in FIG. 3 ) is called downward.

The center housing 11 may include an outer wall portion (hereinafter, center housing outer wall portion) 111 formed in an annular shape and the main frame 112 formed to cross the inner circumferential surface of the center housing outer wall portion 111 . there is. That is, the center housing outer wall portion 111 is formed in a cylindrical shape having a first opening opened to the front and a second opening opened to the rear, and the main frame 112 is formed inside the center housing outer wall portion 111 . The space may be partitioned into a space on the side of the first opening and a space on the side of the second opening.

The first opening of the center housing outer wall portion 111 may be covered by the front housing 12 . Accordingly, the first space S1 may be formed by the first opening side end of the center housing outer wall portion 111 , the main frame 112 , and the front housing 12 .

The second opening of the center housing outer wall part 111 may be covered by the rear housing 13 . Accordingly, the second space S2 may be formed by the second opening side end of the center housing outer wall portion 111 , the main frame 112 , and the rear housing 13 .

On the inner circumferential surface of the center housing outer wall portion 111 forming the second space S2, a seating groove 1111 in which a non-orbiting mirror plate part 321 to be described below is seated, a non-orbiting wrap 322 to be described later, and the turning A receiving groove 1112 in which the scroll 31 is accommodated may be formed.

The seating groove 1111 may be engraved from the second opening side end surface 111b (one front end surface of the center housing outer wall part 111 ) opposite to the rear housing 13 .

In addition, the seating groove 1111 has an inner diameter of the seating groove 1111 so that a non-orbiting mirror plate part 321 to be described later can be inserted into the seating groove 1111 is formed at about the same level as an outer diameter of a non-orbiting mirror plate part 321 to be described later. , preferably, the inner diameter of the seating groove 1111 may be slightly smaller than the outer diameter of the non-orbiting mirror plate part 321 to be described later so that the non-orbiting mirror plate part 321 can be press-fitted.

In addition, the seating groove 1111 has a depth (front and rear) of the seating groove 1111 so that a non-orbiting mirror plate part 321 to be described later can overlap the center housing outer wall part 111 and the center housing outer wall part 111 in the turning radius direction (up and down direction). length) may be equal to or deeper than the depth (front and rear length) of the non-orbiting mirror plate portion 321 to be described later. In this embodiment, the depth of the seating groove 1111 may be formed at the same level as the depth of the non-orbiting mirror plate portion 321 to be described later.

The receiving groove 1112 may be engraved from the seating groove 1111 .

In addition, the receiving groove 1112 has an inner diameter of the receiving groove 1112 smaller than the inner diameter of the seating groove 1111 so as to prevent the non-orbiting mirror plate part 321, which will be described later, from moving forward from a predetermined position. can be formed. That is, a stepped portion 1113 may be formed between the receiving groove 1112 and the seating groove 1111 .

Meanwhile, in the center housing outer wall portion 111 , a second flow path hole 42 penetrating the center housing outer wall portion 111 may be formed. The second passage hole 42 forms a part of the oil return passage 4 , which will be described later.

A shaft hole 1121 through which the rotation shaft 23 extending from the driving unit 2 passes may be formed in the main frame 112 .

A first bearing 61 for rotatably supporting the rotation shaft 23 may be interposed between the bearing hole 1121 and the rotation shaft 23 .

In addition, the main frame 112 may be provided with a turning groove 1122 in which the counter mass 233 fastened to the end of the rotation shaft 23 can pivot.

The turning groove 1122 may be engraved on one surface of the main frame 112 opposite to the compression part 3 , and may be formed to communicate with the bearing hole 1121 .

Meanwhile, the orbiting groove 1122 may be covered by the orbiting scroll 31 to form a back pressure chamber P for pressing the orbiting scroll 31 toward the non-orbiting scroll 32 .

In addition, a branch hole 43 connecting the second flow passage hole 42 and the back pressure chamber P may be formed in the main frame 112 . The branch hole 43 forms a part of the oil return passage 4 , which will be described later.

In addition, a suction hole 1123 for communicating the first space S1 and the second space S2 may be formed in the main frame 112 . Here, the first space (S1) communicates with a suction pipe (not shown) through which the refrigerant to be compressed flows and functions as a suction space, and the suction hole 1123 receives the refrigerant of the first space (S1). It functions as a refrigerant passage guiding to the second space S2.

The front housing 12 includes a base wall portion (hereinafter, referred to as a front housing base wall portion) 121 formed in a disk shape and a side wall portion (hereinafter, referred to as a front housing) protruding from the outer periphery of the front housing base wall portion 121 to form an annular shape. The side wall portion 122) may be included.

In the front housing 12 , the front housing side wall part 122 may be fastened to the first opening side front end of the center housing outer wall part 111 to form the first space S1 .

The rear housing 13 includes a base wall portion (hereinafter, referred to as a rear housing base wall portion) 131 formed in a disk shape and a side wall portion (hereinafter, referred to as a rear housing) protruding from the outer periphery of the rear housing base wall portion 131 to form an annular shape. side wall portion) 132 .

In the rear housing 13 , the rear housing side wall part 132 may be fastened to the second opening side front end of the center housing outer wall part 111 to form the second space S2 .

At this time, the rear housing side wall part 132 has a front end surface of the rear housing side wall part 132 (hereinafter, a rear housing front end surface 1321) is the second opening side end surface 111b (the center housing outer wall part). (one front end surface of 111) and a non-orbiting mirror plate portion 321 to be described later may be formed in contact. That is, the outer peripheral portion of the rear housing end surface 1321 is in contact with the second opening side end surface 111b (one end surface of the center housing outer wall portion 111 ) for fastening with the center housing 11 . The inner periphery of the rear housing front end surface 1321 prevents the non-orbiting mirror plate portion 321 from being moved to the rear and allows the collection space 134 to be described later and the first flow hole 41 to communicate with each other. It may come into contact with the outer periphery of the non-orbiting mirror plate portion 321 .

On the other hand, in the rear housing 13, the discharge space 133 through which the refrigerant compressed by the compression unit 3 is discharged, and the oil communicated with the discharge space 133 and separated from the refrigerant in the discharge space 133. A collection space 134 to be collected may be formed.

The discharge space 133 communicates with a discharge pipe (not shown) that guides the refrigerant in the discharge space 133 to the outside of the casing 1, and the compression part ( An oil separator (not shown) for separating oil from the refrigerant discharged in 3) may be provided.

The collection space 134 communicates with the oil return passage 4 for recovering the oil in the collection space 134 , and a filter 1341 for collecting foreign substances is provided on the upstream side of the oil return passage 4 . can

Meanwhile, the casing 1 may further include an inverter housing 14 coupled to the front housing 12 . The inverter housing 14 may form a third space S3 in which an inverter element (not shown) for controlling the driving unit 2 is accommodated.

The driving unit 2 includes a stator 21 fixed to the front housing side wall portion 122 , a rotor 22 rotating inside the stator 21 by interaction with the stator 21 , and the rotor It may include the rotation shaft 23 fastened to (22).

The rotating shaft 23 passes through the central portion of the rotor 22 and one end 231 of the rotating shaft 23 protrudes toward the main frame 112 with respect to the rotor 22, and the rotation shaft The other end 232 of (23) may protrude toward the front housing base wall portion 121 with respect to the rotor 22 .

One end 231 of the rotating shaft 23 may pass through the bearing hole 1121 of the main frame 112 to be supported by the first bearing 61 .

In addition, the counter mass 233 for canceling vibration may be coupled to one end 231 of the rotation shaft 23 .

An eccentric portion 2331 for pivoting the orbiting scroll 31 may be formed on the counter mass 233 .

The other end 232 of the rotation shaft 23 may be supported by a second bearing 62 provided in the front housing 12 .

And, the other end 232 of the rotation shaft 23 may be provided with an oil pump (not shown) for sucking oil from the bottom of the first space (S1).

Meanwhile, an oil through hole (not shown) for guiding the oil sucked from the oil pump (not shown) to each lubricating part may be formed in the rotation shaft 23 .

The compression unit 3 may include the non-orbiting scroll 32 and the orbiting scroll 31 meshing with each other to form the compression chamber C.

The non-orbiting scroll 32 protrudes from a disk-shaped non-orbiting mirror plate part 321 and a circular surface (hereinafter referred to as the upper surface of the non-orbiting mirror plate part) 3211 of the non-orbiting mirror plate part 321, and the orbiting scroll ( 31) may include a non-orbiting wrap 322 that meshes with the orbiting wrap 312 to be described later.

In the non-orbiting scroll 32 , the non-orbiting mirror plate part 321 is inserted into the seating groove 1111 , the non-orbiting wrap 322 is accommodated in the receiving groove 1112 , and the center housing 11 ) and the turning radius direction (up and down direction) can be installed to overlap.

Here, the non-orbiting mirror plate part 321 may be formed to have a predetermined outer diameter and depth to be inserted into the seating groove 1111 . More specifically, the non-orbiting mirror plate portion 321 has an outer diameter of the non-orbiting mirror plate portion 321 that is larger than the inner diameter of the seating groove 1111 so as to be press-fitted into the inner circumferential surface of the seating groove 1111, and the center housing outer wall portion It may be formed smaller than the outer diameter of (111). In addition, the non-orbiting mirror plate part 321 has another circular surface (hereinafter, the non-orbiting mirror plate part bottom surface 3212) opposite to the upper surface 3211 of the non-orbiting mirror plate part protruding out of the seating groove 1111. In order not to interfere with the rear housing 13 , a depth of the non-orbiting mirror plate part 321 may be the same as that of the seating groove 1111 or may be formed to be shallower than a depth of the seating groove 1111 . In the present embodiment, the non-orbiting mirror plate part 321 may be formed at the same level as the depth of the seating groove 1111 so as not to flow inside the seating groove 1111 . Here, the depth means the front-to-rear distance. The non-orbiting mirror plate part 321 formed in this way is inserted into the seating groove 1111 so that the outer peripheral surface 3213 of the non-orbiting mirror plate part 321 is supported on the inner peripheral surface of the seating groove 1111, and the non-orbiting mirror plate part 321 is supported on the inner peripheral surface. An outer periphery of the upper surface 3211 of the head plate portion may be supported by the stepped portion 1113 , and an outer peripheral portion of the lower surface 3212 of the non-orbiting mirror plate portion may be supported on the front end surface 1321 of the rear housing. At this time, in the non-orbiting scroll 32, when the non-orbiting mirror plate part 321 is seated in the seating groove 1111, the center of the non-orbiting scroll 32 and the center of the orbiting motion of the orbiting scroll 31 are It can be coaxially aligned.

On the other hand, on the central side of the non-orbiting mirror plate part 321, a discharge port 323 passing through the non-orbiting mirror plate part 321 and guiding the refrigerant compressed in the compression chamber C to the discharge space 133 is provided. can be formed.

In addition, a first flow path hole 41 passing through the non-orbiting mirror plate part 321 and communicating with the collecting space 134 may be formed on the outer peripheral side of the non-orbiting mirror plate part 321 .

The first passage hole 41 forms a part of the oil return passage 4, which will be described later.

The orbiting scroll 31 protrudes from a circular plate-shaped orbiting mirror plate part 311 and a circular surface of the orbiting mirror plate part 311 (hereinafter, the upper surface of the orbiting mirror plate part 3111), and includes the non-orbiting wrap 322 and It may include a revolving wrap 312 which is meshed and forms the compression chamber (C) of two pairs.

The orbiting scroll 31 is to be installed such that the orbiting mirror plate part 311 and the orbiting wrap 312 are accommodated in the receiving groove 1112 to overlap the center housing 11 in the turning radius direction (up and down direction). can

And, the orbiting scroll 31 is seated on the main frame 112 to cover the orbiting groove 1122 to form the back pressure chamber P together with the orbiting groove 1122, and the eccentric part 2331 ) and can be installed to rotate.

More specifically, the turning mirror plate part 311 includes a support part 313 protruding to the opposite side of the turning wrap 312 and contacting the main frame 112 and the turning lap 312 projecting to the opposite side of the side. A boss part 314 into which the core part 2331 is inserted may be formed.

The support part 313 is formed in an annular shape along the outer periphery of the orbiting head plate part 311, and when the orbiting scroll 31 is pivoted, all front end surfaces of the support part 313 are the main frame 112 and the main frame 112. It may be formed to maintain contact. Accordingly, the turning groove 1122 is covered by the support part 313 and the turning mirror plate part 311 to form the back pressure chamber P together with the support part 313 and the turning mirror plate part 311. can

Here, the back pressure chamber P is provided to prevent refrigerant leakage between the orbiting wrap 312 and the non-orbiting mirror plate part 321 and between the non-orbiting wrap 322 and the turning mirror plate part 311 . In order to adhere the orbiting scroll 31 to the non-orbiting scroll 32 with an appropriate pressure, a portion of the refrigerant under compression is introduced through a back pressure hole (not shown) formed in the orbiting mirror plate 311 to provide suction pressure. An intermediate pressure between and discharge pressure may be applied.

Meanwhile, a back pressure chamber sealing member 71 for sealing the back pressure chamber P may be interposed between the main frame 112 and the support part 313 . The back pressure chamber sealing member 71 is formed in an annular shape, and may be inserted into the back pressure chamber sealing member insertion groove 72 formed in the main frame 112 or the support part 313 . That is, the back pressure chamber sealing member 71 may be inserted into the back pressure chamber sealing member insertion groove 72 formed in the support part 313 to pivot along with the orbiting scroll 31 , and the main frame It may be formed to be inserted and fixed in the back pressure chamber sealing member insertion groove 72 formed in the 112 .

The boss part 314 may be formed to protrude in an annular shape from the center side of the revolving mirror plate part 311 . In addition, the boss part 314 has an inner diameter of the boss part 314 so that the third bearing 63 is interposed between the inner peripheral surface of the boss part 314 and the outer peripheral surface of the eccentric part 2331. It may be formed to be larger than the outer diameter of the core 2331 .

The oil return passage 4 includes passage holes 41 and 42 respectively formed in the non-orbiting scroll 32 and the center housing 11 to recover the oil collected in the collection space 134 to each driving part. This communication may be formed. That is, the oil return passage 4 may be formed by communicating with a plurality of segmented passage holes 41 and 42 .

More specifically, the oil return passage 4 is formed in the first passage hole 41 and the center housing 11 formed in the non-orbiting scroll 32 and communicating with the collection space 134, and the The second channel hole 42 may be included in communication with the first channel hole 41 .

The first flow hole 41 may be formed on an outer periphery of the non-orbiting mirror plate part 321 in contact with the rear housing 13 so as to communicate with the collection space 134 formed in the rear housing 13 . there is.

The second passage hole 42 is formed in the center housing outer wall portion 111 in contact with the non-orbiting scroll 32 so as to communicate with the first passage hole 41 formed in the non-orbiting scroll 32 . can be

Here, between the rear housing 13 and the non-orbiting mirror plate portion 321 , a first sealing member 73 for sealing a first communication portion between the collection space 134 and the first flow hole 41 is provided. may be interposed. The first sealing member 73 is formed to extend along the circumferential direction of the first communication portion, and at least one of the rear housing 13 and the non-orbiting mirror plate portion 321 has the first sealing member 73 . A first sealing member insertion groove 74 into which the first sealing member 73 is inserted may be formed so that the first sealing member 73 is stably supported.

And, between the center housing outer wall portion 111 and the non-orbiting mirror plate portion 321, a second sealing member for sealing a second communication portion between the first passage hole 41 and the second passage hole 42 (75) may be interposed. The second sealing member 75 is formed to extend along the circumferential direction of the second communication portion, and the second sealing member ( A second sealing member insertion groove 76 into which the second sealing member 75 is inserted may be formed so that the second sealing member 75 is stably supported.

On the other hand, the second passage hole 42 is a first accommodating space 421 in which a first pressure reducing means 51 to be described later is accommodated, and a second receiving space 422 in which a second pressure reducing means 52 to be described later is accommodated. and a communication hole 423 for communicating the first accommodating space 421 and the second accommodating space 422 .

The first accommodating space 421 may be engraved from the stepped portion 1113 so that a first pressure reducing means 51 to be described later can be inserted thereinto.

And, in the first accommodating space 421, one end of the first accommodating space 421 (the opening into which the first pressure reducing means 51 is inserted) communicates with the first passage hole 41, The other end of the first accommodation space 421 may communicate with the communication hole 423 .

And, the first accommodating space 421 has an inner diameter of the first accommodating space 421 such that the pressure of oil flowing from the first flow hole 41 is reduced by the venturi effect. ) can be formed larger than the inner diameter.

The second accommodating space 422 may be engraved from the front end surface of the first opening side of the center housing outer wall 111 so that a second pressure reducing means 52 to be described later can be inserted thereinto.

And, in the second accommodating space 422, one end of the second accommodating space 422 (the opening into which the second pressure reducing means 52 is inserted) communicates with the first space S1, and the second The other end of the accommodation space 422 may communicate with the communication hole 423 .

Here, in the second accommodating space 422 , one end of the second accommodating space 422 (the opening into which the second pressure reducing means 52 is inserted) faces the front end surface of the front housing 12 , and the front housing (12) By being spaced apart by a predetermined distance from the front end surface, it can communicate with the first space (S1). At this time, when one end of the second accommodating space 422 is opposite to the front end surface of the front housing 12 , the second pressure reducing means 52 accommodated in the second accommodating space 422 is connected to the front housing 12 . This is to prevent separation from the second accommodation space 422 by being supported on the front end surface.

In addition, the second accommodating space 422 may have an inner diameter of the second accommodating space 422 equal to the inner diameter of the first accommodating space 421 .

The communication hole 423 is formed in the first accommodation space to prevent the first pressure reducing means 51 inserted into the first accommodation space 421 from moving toward the second accommodation space 422 rather than a predetermined position. It may be formed to be stepped at 421 . That is, the communication hole 423 communicates between the communication hole 423 and the first accommodating space 421 such that a first stepped surface 424 supporting the first pressure reducing means 51 to be described later is formed. The inner diameter of the ball 423 may be smaller than the inner diameter of the first accommodation space 421 .

And, the communication hole 423 prevents the second pressure reducing means 52 inserted into the second accommodating space 422 from moving toward the first accommodating space 421 rather than a predetermined position. It may be formed to be stepped in the accommodating space 422 . That is, the communication hole 423 communicates between the communication hole 423 and the second accommodation space 422 so that a second stepped surface 425 supporting a second pressure reducing means 52 to be described later is formed. The inner diameter of the ball 423 may be smaller than the inner diameter of the second accommodation space 422 .

Meanwhile, the second passage hole 42 may further include the branch hole 43 for guiding a portion of the oil flowing in from the first accommodation space 421 to the back pressure chamber P.

In the branch hole 43 , one end of the branch hole 43 may communicate with the communication hole 423 , and the other end of the branch hole 43 may communicate with the back pressure chamber P .

The plurality of pressure reducing means 51 and 52 includes a first pressure reducing means 51 and the first pressure reducing means 51 for reducing the pressure of the oil flowing in from the first passage hole 41 to a predetermined first pressure. ) may include a second pressure reducing means 52 for reducing the pressure of the oil reduced by the pressure to a second pressure lower than the first pressure. Here, the pressure of the oil flowing in from the first passage hole 41 is a discharge pressure equal to the pressure in the discharge space 133, and the first pressure is an intermediate pressure equal to the pressure in the back pressure chamber P, The second pressure may be the same suction pressure as the pressure of the first space S1.

The first pressure reducing means 51 may be formed in a cylindrical shape extending in the longitudinal direction, and a spiral oil conveying groove 511 extending in the longitudinal direction may be formed on the outer circumferential surface. Here, the oil transfer groove 511 may provide an oil transfer path together with the inner wall of the oil return passage 4 .

In addition, the first pressure reducing means 51 has a hollow shape, and one end of the first pressure reducing means 51 has an open end 512 , so that the internal space of the first pressure reducing means 51 is formed through the open end 512 . It can communicate with the outside. In addition, the other end opposite to the open end 512 may be formed as a closed end 513 . Here, the open end 512 may be disposed to face a relatively high pressure side among both ends of the first pressure reducing means 51 . Accordingly, a portion of the oil may be introduced into the inner space of the first pressure reducing means 51 through the open end 512 . The oil introduced in this way may press the first pressure reducing means 51 radially outward, that is, toward the inner wall of the oil return passage 4 . For this reason, the oil transfer groove 511 formed on the outer peripheral surface of the first pressure reducing means 51 is in close contact with the inner wall of the oil return passage 4 , and accordingly, the oil crosses the oil transfer groove 511 . movement can be prevented. Due to this, the helical movement of the oil is accelerated, the flow path of the oil is increased, and the decompression effect may be increased.

The first pressure reducing means 51 formed in this way may be inserted into the first receiving space 421 from the rear side.

The first pressure reducing means 51 inserted into the first accommodating space 421 communicates with the outer diameter of the first pressure reducing means 51 being formed at the same level as the inner diameter of the first accommodating space 421 . It is larger than the inner diameter of the ball 423 and may be supported on the first stepped surface 424 .

The second pressure reducing means 52 is formed on the same principle as the first pressure reducing means 51 , and may be inserted into the second accommodation space 422 from the front side.

The second pressure reducing means 52 inserted into the second accommodating space 422 communicates with the outer diameter of the second pressure reducing means 52 being formed at the same level as the inner diameter of the second accommodating space 422 . It is larger than the inner diameter of the ball 423 and may be supported on the second stepped surface 425 .

Hereinafter, the effect of the scroll compressor according to the present embodiment will be described.

That is, when power is applied to the driving unit 2 , the rotating shaft 23 rotates together with the rotor 22 to transmit a rotational force to the orbiting scroll 31 .

Then, the orbiting scroll 31 is rotated by an eccentric distance by the eccentric portion 2331 of the rotation shaft 23, and the compression chamber C is continuously moved toward the center and the volume is reduced. can

Then, the refrigerant flows into the second space S2 through the suction pipe (not shown), the first space S1, and the suction hole 1123, and the refrigerant introduced into the second space S2 is It may be sucked into the compression chamber (C).

The refrigerant sucked into the compression chamber (C) may be compressed while moving toward the center along the movement path of the compression chamber (C) and discharged to the discharge space (133) through the discharge port (323).

The refrigerant discharged to the discharge space 133 is separated from the oil contained in the refrigerant by the oil separator (not shown) and then discharged to the outside of the compressor through the discharge pipe (not shown). repeated.

Meanwhile, after the oil separated from the refrigerant by the oil separator (not shown) is collected in the collection space 134 , it may be recovered to each driving part through the oil return passage 4 .

More specifically, the oil collected in the collection space 134 may be moved to the first accommodation space 421 through the first passage hole 41 .

Oil of a discharge pressure flowing into the first accommodating space 421 from the first passage hole 41 is venturi caused by a difference between the inner diameter of the first passage hole 41 and the inner diameter of the first accommodation space 421 . As a result, the primary pressure can be reduced to a pressure lower than the discharge pressure and higher than the intermediate pressure.

The first pressure-reduced oil may be secondarily decompressed to an intermediate pressure by the first pressure reducing means 51 and then introduced into the communication hole 423 . Here, the first decompression means 51 depressurizes the oil pressure to the intermediate pressure, as will be described later, in the back pressure chamber ( is moved to P), and when the pressure of the oil moving to the back pressure chamber P is higher than the pressure in the back pressure chamber P, the pressure in the back pressure chamber P increases, and the orbiting scroll 31 and the non-orbiting A problem in that friction increases between the scrolls 32 may occur, and when the pressure of the oil moving to the back pressure chamber P is lower than the pressure in the back pressure chamber P, the oil flows into the back pressure chamber P. This is because the problem of not being able to move may occur.

Some of the medium pressure oil introduced into the communication hole 423 may be introduced into the back pressure chamber P through the branch hole 43 .

The oil introduced into the back pressure chamber P is interposed between the first bearing 61 interposed between the main frame 112 and the rotating shaft 23 and the rotating shaft 23 and the orbiting scroll 31 The third bearing 63 may be lubricated.

Then, the oil introduced into the back pressure chamber P is supplied to the contact area between the main frame 112 and the orbiting scroll 31 to lubricate the contact area and form an oil film sealing layer between the contact areas. Thus, the back pressure chamber P can be more effectively sealed.

In addition, the oil introduced into the back pressure chamber P may be introduced into the compression chamber C through the back pressure hole (not shown). The oil introduced into the compression chamber (C) lubricates the contact area between the orbiting scroll 31 and the non-orbiting scroll 32, and forms an oil film sealing layer between the contact areas to close the compression chamber (C). After sealing more effectively, it may be discharged back to the discharge space 133 together with the refrigerant.

In addition, some of the medium pressure oil introduced into the communication hole 423 may be introduced into the second accommodation space 422 .

The medium pressure oil flowing into the second accommodation space 422 is tertiary at a pressure lower than the intermediate pressure due to the Venturi effect due to the difference between the inner diameter of the second accommodation space 422 and the inner diameter of the communication hole 423 . can be decompressed.

The tertiary decompressed oil may be introduced into the first space S1 after the tertiary decompression is fourthly reduced to suction pressure by the second decompression means 52 . Here, when the second pressure reducing means 52 reduces the pressure of the oil to the suction pressure, the pressure of the oil passing through the second pressure reducing means 52 is higher than the pressure in the first space S1 of the suction pressure. If it is high, overcompression may occur, and if the pressure of the oil passing through the second pressure reducing means 52 is lower than the pressure of the first space S1, the oil cannot move to the first space S1. Because this can happen.

The oil introduced into the first space (S1) is sucked by the oil pump (not shown), and various driving parts (eg, the second bearing 62) provided in the first space (S1) are removed. It can be lubricated and moved to the back pressure chamber P through an oil through hole (not shown) of the rotary shaft 23 .

Here, in the scroll compressor according to the present invention, the compression unit 3 including the orbiting scroll 31 and the non-orbiting scroll 32 may be accommodated in the inner space of the casing 1 . That is, the casing (1) is formed of the front housing (12), the center housing (11) and the rear housing (13), and the non-orbiting scroll does not form a part of the casing (1) and the casing ( 1) (more precisely, the center housing 11) and the turning radius direction (up and down direction) may be formed to overlap.

Thereby, the noise and vibration generated in the compression chamber (C) are first reduced by the non-orbiting scroll (32) and secondarily reduced by the casing (1), so that it can be prevented from being emitted to the outside. there is.

And, as the outer diameter of the non-orbiting scroll 32 is formed to be smaller than that of the casing 1, the outer diameter of the non-orbiting scroll 32 is reduced, so that the cost and weight of the non-orbiting scroll 32 are reduced. can

And, as the non-orbiting scroll 32 is guided to a predetermined position by the seating groove 1111, the center of the non-orbiting scroll 32 and the center of the orbiting motion of the orbiting scroll 31 are coaxial deviation can be prevented. That is, tolerance management may be facilitated.

And, the number of divided surfaces of the casing 1 (between the front housing 12 and the center housing 11, between the center housing 11 and the rear housing 13) is equal to the number of the conventional division surfaces (the above). between the front housing 12 and the center housing 11, between the center housing 11 and the non-orbiting scroll 32, and between the non-orbiting scroll 32 and the rear housing 13). Accordingly, the possibility of leakage of refrigerant and oil through the divided surface is reduced, and leakage of refrigerant and oil can be prevented.

On the other hand, in the scroll compressor according to the present invention, the plurality of passage holes (41, 42) in which the oil return passage (4) is segmented are communicated, and the plurality of pressure reducing means (51, 52) are the plurality of It may be formed in one of the flow holes. More specifically, the oil return passage 4 is formed by communicating the first passage hole 41 and the second passage hole 42, and the first pressure reducing means 51 and the second pressure reducing means ( 52 ) may be provided in the second flow hole 42 .

As a result, as a flow path between the first pressure reducing means 51 and the second pressure reducing means 52 is continuously formed, the oil between the first pressure reducing means 51 and the second pressure reducing means 52 is formed. Leakage can be prevented. Accordingly, oil is smoothly recovered to prevent a decrease in the amount of oil in the compressor, and proper lubrication can be achieved.

In addition, a flow rate test for confirming whether the first pressure reducing means 51 and the second pressure reducing means 52 are normally assembled can be simplified. That is, in this embodiment, the flow rate test is performed only once in a state in which the first pressure reducing means 51 and the second pressure reducing means 52 are fastened to the second passage hole 42 (the center housing 11). Since it can be carried out, the flow rate test for the first pressure reducing means 51 and the flow rate test for the second pressure reducing means 52 are separately performed compared to the prior art, which can be simplified. Accordingly, the assembly state of the first pressure reducing means 51 and the second pressure reducing means 52 can be easily grasped.

In addition, in the scroll compressor according to the present invention, the first sealing member 73 and the first passage hole 41 for sealing a first communication portion between the collection space 134 and the first passage hole 41 . As the second sealing member 75 for sealing the second communication portion between the and the second passage hole 42 is provided, it is possible to prevent oil leakage through the first communication portion and the second communication portion. there is.

1: Casing 2: Drive
3: Compression part 4: Oil return passage
11: center housing 12: front housing
13: rear housing 31: orbiting scroll
32: non-orbiting scroll 41: first flow hole
42: second flow hole 43: branch hole
51: first pressure reducing means 52: second pressure reducing means
73: first sealing member 74: first sealing member insertion groove
75: second sealing member 76: second sealing member insertion groove
111: outer wall portion 112: main frame
133: discharge space 134: collection space
321: non-orbiting head plate part 322: non-orbiting wrap
421: first accommodation space 422: second accommodation space
423: through hole 424: first stepped surface
425: second stepped surface 1111: seating groove
1112: receiving groove 1113: stepped portion
S1: first space S2: second space

Claims (15)

Casing (1) having an inner space;
a driving unit (2) provided in the inner space of the casing (1) and generating a rotational force; and
A compression unit (3) including an orbiting scroll (31) that swings by receiving rotational force from the driving unit (2) and a non-orbiting scroll (32) that forms a compression chamber (C) together with the orbiting scroll (31) including;
The casing (1) includes a center housing (11) in which a main frame (112) supporting the orbiting scroll (31) is formed; a front housing 12 fastened to the center housing 11 to form a first space S1 in which the driving unit 2 is accommodated; and a rear housing 13 fastened to the center housing 11 from the opposite side of the front housing 12 with respect to the main frame 112 to form a second space S2 in which the compression part 3 is accommodated. ); including;
The compression part 3 is accommodated in the inner space of the casing 1 and is formed to overlap with the center housing 11 in the turning radius direction,
The non-orbiting scroll 32 includes a disk-shaped non-orbiting mirror plate portion 321; and a non-orbiting lap 322 that protrudes from one circular surface 3211 of the non-orbiting mirror plate part 321 and meshes with the orbiting wrap 312 of the orbiting scroll 31; 321 is supported on the inner circumferential surface of the center housing 11,
The center housing 11 includes an outer wall portion 111 formed in an annular shape, and on an inner circumferential surface of the outer wall portion 111 , a seating groove 1111 in which the non-orbiting mirror plate portion 321 is seated, and the non-orbiting wrap A receiving groove 1112 in which the 322 is accommodated is formed,
The seating groove 1111 is engraved from one end surface 111b of the outer wall 111 opposite to the rear housing 13 , and the receiving groove 1112 is engraved from the seating groove 1111 . is formed so that the inner diameter of the receiving groove 1112 is smaller than the inner diameter of the seating groove 1111,
The non-orbiting mirror plate portion 321 is supported by the stepped portion 1113 formed by the seating groove 1111 and the receiving groove 1112,
The rear housing 13 has a discharge space 133 through which the refrigerant compressed by the compression unit 3 is discharged, and the discharge space 133 communicates with the discharge space 133, and the oil separated from the refrigerant in the discharge space 133 is collected. A collection space 134 is formed,
A first flow path hole 41 communicating with the collection space 134 is formed in the non-orbiting mirror plate portion 321 of the non-orbiting scroll 32,
A second passage hole 42 communicating with the first passage hole 41 is formed in the stepped portion 1113 of the center housing 11,
A first sealing member 73 is interposed between the rear housing 13 and the non-orbiting mirror plate portion 321 to seal a communication portion between the collection space 134 and the first flow passage hole 41,
A second sealing member 75 is interposed between the stepped portion 1113 and the non-orbiting mirror plate portion 321 to seal a communication portion between the first passage hole 41 and the second passage hole 42 , ,
The second passage hole 42 includes a first accommodation space 421 in which a first pressure reducing means 51 for reducing the pressure of oil flowing in from the first passage hole 41 is accommodated,
The scroll compressor according to claim 1, wherein an inner diameter of the first accommodating space (421) is larger than an inner diameter of the first flow hole (41). delete delete delete According to claim 1,
In the seating groove 1111, when the non-orbiting mirror plate part 321 is seated in the seating groove 1111, the center of the non-orbiting scroll 32 and the center of the orbiting motion of the orbiting scroll 31 are on the same axis. A scroll compressor configured to be aligned. delete According to claim 1,
In the seating groove 1111 , a depth of the seating groove 1111 is the same as that of the non-orbiting mirror plate part 321 or is formed to be deeper than a depth of the non-orbiting mirror plate part 321 . According to claim 1,
In the non-orbiting mirror plate part 321 , an outer diameter of the non-orbiting mirror plate part 321 is greater than an inner diameter of the seating groove 1111 and smaller than an outer diameter of the outer wall part 111 . delete delete According to claim 1,
The rear housing 13 is fastened to one front end surface 111b of the center housing 11, and the non-orbiting mirror plate part 321 is a surface opposite to the one circular surface 3211 of the non-orbiting mirror plate part 321. Scroll compressor, characterized in that in contact with the other circular surface (3212) of. delete According to claim 1,
The first sealing member 73 is formed to extend along the circumferential direction of the communication portion between the collecting space 134 and the first flow hole 41,
The second sealing member (75) is formed to extend along a circumferential direction of a communication portion between the first flow hole (41) and the second flow hole (42). According to claim 1,
A first sealing member insertion groove 74 into which the first sealing member 73 is inserted is formed in at least one of the rear housing 13 and the non-orbiting mirror plate portion 321,
A second sealing member insertion groove (76) into which the second sealing member (75) is inserted is formed in at least one of the stepped portion (1113) and the non-orbiting mirror plate portion (321). According to claim 1,
A second pressure reducing means (52) for reducing the pressure of the oil that has passed through the first pressure reducing means (51) is further formed in the second passage hole (42).

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