KR20220165508A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor, which comprises: an orbiting scroll which is orbitally moved by receiving power; a fixed scroll forming a compression chamber together with the orbiting scroll; a rear housing having a suction chamber accommodating refrigerant to flow into the compression chamber and a discharge chamber accommodating refrigerant discharged from the compression chamber; an oil recovery passage for recovering oil separated from the refrigerant of the rear housing; and a plate which seals between the suction chamber and the discharge chamber and separates foreign substances from the oil passing through the oil recovery passage. Accordingly, the number of parts and manufacturing cost can be reduced, the possibility of quality problems can be lowered, and the degree of design freedom can be increased.

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor capable of compressing a refrigerant with a fixed scroll and an orbiting scroll.

In general, an air conditioning unit (A/C) for cooling and heating the interior of a vehicle is installed. As a component of a cooling system, such an air conditioner includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant introduced from an evaporator into a high-temperature, high-pressure gaseous refrigerant and sends it to a condenser.

Compressors include a reciprocating type that compresses refrigerant according to the reciprocating motion of a piston and a rotary type that compresses refrigerant while rotating. In the reciprocating type, there is a crank type that uses a crank to transmit to a plurality of pistons according to the transmission method of the drive source, a swash plate type that transmits to a rotating shaft with a swash plate installed, and the like. There are scrolling types that use orbiting scrolls and fixed scrolls.

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

1 is a cross-sectional view showing a conventional scroll compressor, FIG. 2 is an enlarged view of part A of FIG. 1, FIG. 3 is a perspective view showing a fixed scroll, a discharge valve and a valve retainer in the scroll compressor of FIG. 1, and FIG. 4 is a perspective view showing a rear housing, a sealing member and a filter member in the scroll compressor of FIG. 1 .

1 to 4, the conventional scroll compressor includes a housing 10, a motor 20 provided inside the housing 10, and a rotation shaft 30 rotated by the motor 20. , Orbiting scroll 40 operated by the rotating shaft 30 and a fixed scroll 50 fixed to the housing 10 and meshed with the orbiting scroll 40 to form a compression chamber.

The housing 10 includes a center housing 11, a front housing 12 fastened to the center housing 11, and the center housing 11 on the opposite side of the front housing 12 based on the center housing 11. ) and a rear housing 13 fastened to.

The motor 20 is provided in a space formed by the front housing 12 and the center housing 11 .

The rotating shaft 30 passes through the center housing 11 and extends from the motor 20 toward the rear housing 13 .

The fixed scroll 50 is provided in a space formed by the rear housing 13 and the center housing 11, and the orbiting scroll 40 is attached to the fixed scroll 50 and the center housing 11. It is provided in the space formed by

Here, the fixed scroll 50 includes a discharge port 54 for discharging the refrigerant in the compression chamber, and the rear housing 13 has a discharge chamber S3 for accommodating the refrigerant discharged from the discharge port 54. Including, the discharge valve 62 for opening and closing the discharge port 54 and the valve retainer 64 for limiting the opening amount of the discharge valve 62 are fixed to the fixed scroll 50 by a fastening bolt 66 do.

Also, a sealing member 70 for sealing the discharge chamber S3 is interposed between the fixed scroll 50 and the rear housing 13 .

On the other hand, the rear housing 13 includes an oil separation chamber S4 into which the refrigerant of the discharge chamber S3 flows and a first oil return passage 13a into which the oil separated from the refrigerant in the oil separation chamber S4 flows. Further, the fixed scroll 50 further includes a second oil return passage 56 communicating with the first oil return passage 13a, and the sealing member 70 is the first oil return passage ( 13a) and a sealing opening 72 surrounding a communication portion between the second oil return passage 56.

In addition, a filter member 80 for separating foreign substances from oil is inserted into the first oil return passage 13a.

In the conventional scroll compressor according to this configuration, when power is applied to the motor 20, the rotary shaft 30 is rotated by the motor 20, and the orbiting scroll 40 rotates with rotational force from the rotary shaft 30. The rotational motion is received, and the volume of the compression chamber is reduced while continuously moving toward the center side. Then, the refrigerant flows into the compression chamber, is compressed while moving toward the center along the movement path of the compression chamber, and is discharged into the discharge chamber S3. Then, the refrigerant discharged into the discharge chamber (S3) passes through the oil separation chamber (S4) and is separated from the oil contained therein, and then discharged to the outside of the housing (10). Meanwhile, the oil separated from the refrigerant in the oil separation chamber S4 is recovered through the first oil return passage 13a and the second oil return passage 56.

However, in such a conventional scroll compressor, the discharge valve 62, the valve retainer 64, the fastening bolt 66, the sealing member 70 and the filter member 80 are formed and then assembled. Accordingly, there are problems in that the number of parts and manufacturing cost increase, the possibility of quality problems increases, and the degree of freedom in design decreases.

Republic of Korea Patent Publication No. 10-2020-0090376

Accordingly, an object of the present invention is to provide a scroll compressor capable of reducing the number of parts and manufacturing cost, reducing the possibility of quality problems, and increasing the degree of design freedom.

The present invention, in order to achieve the object as described above, the orbiting scroll that receives the power and the orbiting movement; a fixed scroll forming a compression chamber together with the orbiting scroll; a rear housing having a suction chamber accommodating the refrigerant to be introduced into the compression chamber and a discharge chamber accommodating the refrigerant discharged from the compression chamber; an oil recovery passage for recovering oil separated from the refrigerant of the rear housing; and a plate that seals between the suction chamber and the discharge chamber and separates foreign substances from the oil passing through the oil return passage.

The plate may include a compression portion compressed by the fixed scroll and the rear housing, and a lead portion extending from the compression portion and opening and closing an outlet of the fixed scroll.

The rear housing further includes an annular wall partitioning the suction chamber and the discharge chamber, the compression unit disposed to be compressed between the annular wall and the fixed scroll, and a first compression unit connected to the lead unit and the first compression unit. 1 may include a second compression part extending from the compression part and surrounding the lead part.

The second compression unit may be formed to be compressed by the annular wall and the fixed scroll when the fixed scroll and the rear housing are assembled.

The fixed scroll may further include a plurality of sub discharge ports for discharging the refrigerant before being compressed to the location of the discharge ports, and the plate may further include a plurality of sub lead parts for opening and closing the plurality of sub discharge ports.

The oil return passage includes a first oil return passage formed in the rear housing and a second oil return passage formed in the fixed scroll, and the plate communicates between the first oil return passage and the second oil return passage. A sealing opening surrounding the region and a screen formed in the sealing opening may be included.

An axial thickness of the screen may be smaller than an axial length of the sealing opening.

A screen inlet space may be formed between the screen and the first oil return passage, and a screen discharge space may be formed between the screen and the second oil return passage.

A cross-sectional flow area of the screen inlet space may be greater than a cross-sectional flow area of the first oil return passage.

The first oil return passage may communicate with a side opposite to the gravity of the screen inlet space.

A cross-sectional flow area of the screen discharge space may be larger than a cross-sectional flow area of the second oil return passage.

The second oil return passage may communicate with a gravity direction side of the screen discharge space.

The lead part, the compression part, and the screen may be integrally formed.

A scroll compressor according to the present invention includes an orbiting scroll that is rotated by receiving power; a fixed scroll forming a compression chamber together with the orbiting scroll; a rear housing having a suction chamber accommodating the refrigerant to be introduced into the compression chamber and a discharge chamber accommodating the refrigerant discharged from the compression chamber; an oil recovery passage for recovering oil separated from the refrigerant of the rear housing; and a plate for sealing between the suction chamber and the discharge chamber and separating foreign substances from the oil passing through the oil return passage, thereby reducing the number of parts and manufacturing cost, reducing the possibility of quality problems, and design freedom. can increase

1 is a cross-sectional view showing a conventional scroll compressor;
Figure 2 is an enlarged view of part A of Figure 1;
3 is a perspective view showing a fixed scroll, a discharge valve and a valve retainer in the scroll compressor of FIG. 1;
4 is a perspective view showing a rear housing, a sealing member and a filter member in the scroll compressor of FIG. 1;
5 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention;
6 is an enlarged view of part B of FIG. 5;
7 is a perspective view showing a fixed scroll and a plate in the scroll compressor of FIG. 5;
8 is an exploded perspective view of FIG. 7;
Figure 9 is a perspective view showing the back of the plate of Figure 8;
Figure 10 is a perspective view shown by cutting away part C of Figure 9;
11 is a perspective view showing a rear housing and a plate in the screen compressor of FIG. 5;
12 is a perspective view showing a retainer surface of a post part in the rear housing of FIG. 11;
13 is a perspective view of the retainer surface of FIG. 12 from another angle;

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

Figure 5 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention, Figure 6 is an enlarged view of part B of Figure 5, Figure 7 is a perspective view showing a fixed scroll and a plate in the scroll compressor of Figure 5, 8 is an exploded perspective view of FIG. 7, FIG. 9 is a perspective view showing the rear surface of the plate of FIG. 8, FIG. 10 is a perspective view of a cutaway portion C of FIG. 9, and FIG. 11 is a screen compressor of FIG. A perspective view showing a rear housing and a plate, FIG. 12 is a perspective view showing the retainer surface of the post part in the rear housing of FIG. 11, and FIG. 13 is a perspective view showing the retainer surface of FIG. 12 from another angle.

5 to 13, the scroll compressor according to an embodiment of the present invention includes a housing 100, a motor 200 generating power inside the housing 100, and the motor 200. A rotation shaft 300 rotated by the rotation shaft 300, an orbiting scroll 400 orbiting by the rotation shaft 300, and fixed to the housing 100 and engaged with the orbiting scroll 400 to form a compression chamber S2. A scroll 500 may be included.

The housing 100 includes a center housing 110, a front housing 120 fastened to the center housing 110 and forming a space in which the motor 200 is accommodated, and the front housing 120 based on the center housing 110. A rear housing 130 coupled to the center housing 110 at an opposite side of the housing 120 and forming a space in which the orbiting scroll 400 and the fixed scroll 500 are accommodated may be included.

The center housing 110 divides a space in which the motor 200 is accommodated and a space in which the orbiting scroll 400 and the fixed scroll 500 are accommodated, and the orbiting scroll 400 and the fixed scroll 500 are accommodated. ) It may include a main frame 112 supporting the main frame 112 and a center housing side plate 114 protruding toward the front housing 120 from an outer circumference of the main frame 112 .

The main frame 112 is formed in a substantially disk shape, and at the center of the main frame 112, a shaft hole through which one end of the rotating shaft 300 passes and the orbiting scroll 400 is directed toward the fixed scroll 500. A pressurized back pressure chamber may be formed. Here, an eccentric bush is formed at one end of the rotary shaft 300 to convert the rotary motion of the rotary shaft 300 into the orbital motion of the orbiting scroll 400, and the back pressure chamber is a space in which the eccentric bush can rotate. can provide.

The front housing 120 is opposed to the main frame 112 and protrudes from a front housing head plate 122 supporting the other end of the rotation shaft 300 and an outer circumferential portion of the front housing head plate 122, and the center housing A front housing side plate 124 coupled to the side plate 114 and supporting the motor 200 may be included.

The rear housing 130 includes a rear housing head plate 132 opposite to the main frame 112 and a rear housing side plate ( 134) may be included.

The rear housing 130 includes a suction chamber S1 accommodating the refrigerant to be introduced into the compression chamber S2, a discharge chamber S3 accommodating the refrigerant discharged from the compression chamber S2, and the suction chamber. It may further include an annular wall 136 partitioning (S1) and the discharge chamber (S3). Here, the annular wall 136 protrudes annularly from the rear housing head plate 132 toward the fixed scroll 500 (more precisely, a plate insertion groove 550 to be described later), and the discharge chamber S3 is formed on the inner side of the annular wall 136 in the radial direction, and the suction chamber S1 may be formed on the outer side of the annular wall 136 in the radial direction.

In addition, the rear housing 130 includes an oil separation chamber S4 into which the refrigerant of the discharge chamber S3 flows and a first oil return passage 138 into which oil separated from the refrigerant in the oil separation chamber S4 flows. can include more.

The first oil return passage 138 includes an upstream portion 138a communicating with the oil separation chamber S4 and a downstream portion 138b communicating with a sealing opening 716 to be described later, and the downstream portion 138b has a larger cross-sectional flow area than the upstream portion 138a, and the upstream portion 138a may communicate with the downstream portion 138b in a direction opposite to gravity.

The rear housing 130 further includes a post part 139 protruding from an inner wall surface of the rear housing head plate 132 toward a lead part 720 to be described later, and the post part 139 is a lead to be described later. It may include a retainer surface 139a contactable with portion 720 .

Here, it may be preferable that the retainer surface 139a is inclined so as to come into surface contact with a lead part 720 to be described later. That is, the retainer surface 139a may be formed such that the distance to the upper surface 514 of the fixed scroll head plate 514 to be described later decreases as it goes toward the first compression unit 712 to be described later.

In addition, the retainer surface 139a preferably includes a groove 139b formed in a negative shape from the retainer surface 139a in order to reduce noise and improve durability through a reduced contact area with the lead part 720, which will be described later. can That is, it may be preferable that the retainer surface 139a has a so-called trepan structure.

The motor 200 may include a stator 210 fixed to the front housing side plate 124 and a rotor 220 rotated by interaction with the stator 210 inside the stator 210. .

The rotating shaft 300 is fastened to the rotor 220 and passes through the center of the rotor 220 so that one end of the rotating shaft 300 passes through the shaft hole of the main frame 112 and the rotating shaft 300 The other end of ) may be supported on the front housing head plate 122.

The orbiting scroll 400 is interposed between the main frame 112 and the fixed scroll 500, and the disk-shaped orbiting scroll head 410 extends from the center of the orbiting scroll head 410 to the fixed scroll 500. ) may include an orbiting scroll wrap 420 protruding to the side and an orbiting scroll boss 430 protruding from the center of the orbiting scroll head plate 410 to the opposite side of the orbiting scroll wrap 420 and engaged with the eccentric bush. .

The fixed scroll 500 includes a disc-shaped fixed scroll head plate 510, a fixed scroll wrap 520 protruding from the center of the fixed scroll head plate 510 and engaged with the orbiting scroll wrap 420, and the fixed scroll head plate. It may include a fixed scroll side plate 530 protruding from an outer circumferential portion of 510, fastened to the main frame 112, and forming a turning space of the orbiting scroll 400.

A discharge port 540 for discharging the refrigerant in the compression chamber S2 to the discharge chamber S3 may be formed at the center of the fixed scroll head plate 510 .

Here, the fixed scroll head plate 510 forms a lower surface of the fixed scroll head plate facing the fixed scroll wrap 520 side and a rear surface of the lower surface of the fixed scroll head plate, and a fixed scroll head plate upper surface 514 facing the discharge chamber S3. The discharge port 540 may be formed through the fixed scroll head plate 510 from the center of the lower surface of the fixed scroll head plate to the center of the upper surface 514 of the fixed scroll head plate.

In addition, the discharge port 540 is a main discharge port 542 formed at the center of the fixed scroll head plate 510 and the radial direction of the fixed scroll head plate 510 based on the main discharge port 542 to prevent overpressure. It may include a plurality of sub outlets 544 formed outside and discharging the refrigerant before being compressed to the position of the main outlet 542 . Here, in the normal compression process, the refrigerant is discharged through the main outlet 542, but when the pressure of the refrigerant becomes higher than a predetermined pressure during the compression process, the refrigerant may be discharged through the plurality of sub outlets 544. .

In addition, a plate insertion groove 550 may be formed on an outer circumferential portion of the upper surface 514 of the fixed scroll head plate to be engraved from the upper surface 514 of the fixed scroll head plate 514 and into which a compression portion 710 to be described later is inserted.

The plate insertion groove 550 may include a first groove part 552 into which a first compression part 712 to be described later is inserted and a second groove part 554 into which a second compression part 714 to be described later is inserted. .

The first groove part 552 is bent from the outer circumference of the first groove part base surface 552a contacting the first compression part lower surface 712a, which will be described later, and the upper surface 514 of the fixed scroll head plate. A first side surface 552b of the first groove portion extending to and a second side surface portion 552c of the first groove portion bent from the inner circumferential portion of the base surface 552a of the first groove portion and extending to the upper surface 514 of the fixed scroll head plate, , The second side surface 552c of the first groove portion may include a support surface 552ca supporting a stepped surface 712da to be described later.

Also, the first groove portion 552 may be formed to be engraved from the bottom surface 552a of the first groove portion, and a second oil return passage 560 communicating with a sealing opening 716 to be described later may be formed.

The second groove part 554 is bent from the outer circumference of the second groove part base surface 554a and the second groove part base surface 554a in contact with the second compression part lower surface 714a, which will be described later, and the upper surface 514 of the fixed scroll head plate. a first side surface 554b of the second groove portion extending to , and a second side surface portion 554c of the second groove portion bent from the inner circumferential portion of the base surface 554a of the second groove portion and extending to the upper surface 514 of the fixed scroll head plate. can

Here, the plate insertion groove 550 is the radial distance between the first side surface 552b of the first groove portion and the second side surface 552c of the first groove portion (the first groove portion 552c) so as to correspond to the compression portion 710 to be described later. The radial width of 552) is greater than the radial distance between the first side surface 554b of the second groove portion 554b and the second side surface 554c of the second groove portion (the radial width of the second groove portion 554). can

A suction hole 532 for guiding the refrigerant in the suction chamber S1 to the compression chamber S2 may be formed in the fixed scroll side plate 530 .

Meanwhile, between the fixed scroll 500 and the rear housing 130, the fixed scroll 500 and the rear housing 130 are fixed by compression by the fixed scroll 500 and the rear housing 130. The space between (more precisely, between the suction chamber S1 and the discharge chamber S3) is sealed, the discharge port 540 is opened and closed, and the oil flows from the first oil return passage 138 to the second oil return passage 560. A plate 700 separating foreign substances from the oil to be formed may be formed.

The plate 700 includes a compression portion 710 compressed by the fixed scroll 500 and the rear housing 130, and a lead portion extending from the compression portion 710 and opening and closing the discharge port 540 ( 720) and a screen 730 formed in a sealing opening 716 to be described later of the compression portion 710, and the compression portion 710, the lead portion 720, and the screen 730 are integrally formed. can be formed Here, being integrally formed may mean that they are formed as a single product that is not segmented from the beginning, rather than being separately formed and then assembled with each other.

When the compression part 710 receives the lead part 720, it is formed in a ring shape, is inserted into the plate insertion groove 550, and the annular wall of the fixed scroll head plate 510 and the rear housing 130 An axial thickness of the compression portion 710 may be formed to be greater than or equal to an axial distance between the plate insertion groove 550 and the front end surface of the annular wall 136 so as to be compressed between 136 .

Specifically, the crimping part 710 includes a first crimping part 712 connected to the lead part 720 and a first crimping part 712 extending annularly from the first crimping part 712 and surrounding the lead part 720 . 2 compression unit 714 may be included.

The first compression part 712 forms an upper surface 712b of the first compression part contacting the front end surface of the annular wall 136 and a rear surface of the upper surface 712b of the first compression part, and the bottom surface 552a of the first groove part. ) It may include a first compression portion lower surface (712a) in contact with.

Further, in the first compression part 712, the distance between the lower surface 712a of the first compression part and the upper surface 712b of the first compression part in the state before compression is the first groove part base surface 552a in the state after compression. ) and the front end surface of the annular wall 136 may be formed larger than the distance.

The second compression part 714 forms the second compression part upper surface 714b contacting the front end surface of the annular wall 136 and the rear surface of the second compression part upper surface 714b, and the second groove part base surface 554a. ).

In addition, in the second compression part 714, the distance between the second compression part lower surface 714a and the second compression part upper surface 714b in the state before compression is the second groove part base surface 554a in the state after compression. ) and the front end surface of the annular wall 136 may be formed larger than the distance.

Here, the axial distance between the first groove portion base surface 552a and the front end surface of the annular wall 136 and the second groove portion base surface 554a and the annular wall ( The axial distance between the front end surfaces of 136) is the same and constant, and the axial distance between the lower surface 712a of the first compression part and the upper surface 712b of the first compression part (of the first compression part 712) axial thickness) and the axial distance between the lower surface 714a of the second compression unit and the upper surface 714b of the second compression unit (axial thickness of the second compression unit 714) may be formed to be constant. .

That is, the first groove portion base surface 552a and the second groove portion base surface 554a are formed on a first plane, and the front end surface of the annular wall 136 is on a second plane parallel to the first plane. The first compression part lower surface 712a and the second compression part lower surface 714a are formed on a third plane, and the first compression part upper surface 712b and the second compression part upper surface 714b This may be formed on a fourth plane parallel to the third plane. The first plane and the second plane are different from each other, and the third and fourth planes are different from each other. And, before the compression unit 710 is compressed, the first plane and the third plane are different from each other, the second plane and the fourth plane are different from each other, and the third plane and the third plane are different from each other. A distance between the four planes may be greater than a distance between the first plane and the second plane. On the other hand, when the compression unit 710 is compressed, the third plane becomes equal to the first plane, the fourth plane becomes equal to the second plane, and the distance between the third plane and the fourth plane becomes It may be reduced to be equal to the distance between the first plane and the second plane.

On the other hand, the first compression portion 712 is bent from the outer circumferential portion of the first compression portion 712c bent from the outer circumferential portion of the first compression portion lower surface 712a and the first compression portion lower surface 712a. 1 may further include an inner circumferential surface 712d of the compression unit.

The outer circumferential surface 712c of the first compression part extends to the upper surface 712b of the first compression part, and at least a part thereof may come into contact with the first side surface 552b of the first groove part.

A portion of the inner circumferential surface 712d of the first crimping part is formed as a stepped surface 712da extending to a lower surface 722 of the lead part, which will be described later, and may come into contact with the support surface 552ca.

The rest of the inner circumferential surface 712d of the first compression part extends to the upper surface 712b of the first compression part, and at least a part is formed on a part of the second side surface 552c of the first groove part excluding the support surface 552ca. can be contacted.

In addition, the second compression part 714 is bent from the outer circumference of the second compression part lower surface 714a and extends to the second compression part upper surface 714b and the second compression part outer circumferential surface 714c and the second compression part 714b. An inner circumferential surface 714d of the second compression part may be bent from an inner circumference of a lower surface of the load and extend to an upper surface 714b of the second compression part. In addition, at least a part of the outer circumferential surface 714c of the second compression part is in contact with the first side surface 554b of the second groove part, and at least a part of the inner circumferential surface 714d of the second compression part is in contact with the second side surface of the second groove part ( 554c).

Here, the radial distance (th 1 radial width of the compression part 712) is greater than the radial distance between the outer circumferential surface 714c of the second compression part and the inner circumferential surface 714d of the second compression part 714 (the radial width of the second compression part 714) can be formed

Meanwhile, the first compression part 712 may further include a sealing opening 716 surrounding a communication portion between the downstream portion 138b of the first oil return passage 138 and the second oil return passage 560. can

Here, the sealing opening 716 may have a larger cross-sectional flow area than the downstream portion 138b of the first oil return passage 138 and the second oil return passage 560 .

And, as shown in FIG. 6, in a state in which the second oil return passage 560 is disposed on the gravitational direction side (downward in FIG. 6) of the downstream portion 138b of the first oil return passage 138. The flow sectional area of the sealing opening 716 is such that the downstream portion 138b of the first oil return passage 138 and the second oil return passage 560 communicate with the sealing opening 716. It may be preferable that the cross-sectional flow area of the downstream portion 138b of 138 and the cross-sectional flow area of the second oil return passage 560 are equal to or larger than the sum of the cross-sectional flow area of the second oil return passage 560 .

The lead part 720 may be formed in a cantilever shape extending from the first compression part 712 toward the center of the compression part 710 .

The lead part 720 forms the center of the upper surface 514 of the fixed scroll head plate and the lower surface of the lid part 722 opposite to the discharge port 540 and the rear surface of the lower surface 722 of the lead part, and the rear housing head plate 132 ) and an upper surface 724 of the lead part facing the post part 139 .

The lower surface of the lead part 722 is formed on the side of the rear housing 130 with respect to the lower surface of the first compression part 712a, and is formed between the lower surface of the lead part 722 and the lower surface of the first compression part 712a. The stepped surface 712da may be formed.

The top surface 724 of the lead part may be formed on the same plane as the top surface 712b of the first compression part and the top surface 714b of the second compression part.

Meanwhile, the lead part 720 may include a main lead part 720a for opening and closing the main discharge port 542 and a plurality of sub lead parts 720b for opening and closing the plurality of sub discharge ports 544. there is.

The screen 730 is formed of a mesh covering the sealing opening 716, and may be formed simultaneously with the sealing opening 716 through a punching process, for example.

And, as shown in FIGS. 6 and 10 , a screen discharge space V2 having a larger cross-sectional flow area than the second oil return passage 560 between the screen 730 and the second oil return passage 560 The screen 730 is formed such that the axial thickness of the screen 730 is smaller than the axial thickness of the first compression portion 712 and the axial length of the sealing opening 716, and the first It may be formed at a position spaced apart from the lower surface 712a of the compression unit toward the upper surface 712b of the first compression unit. At this time, the second oil return passage 560 having a smaller flow cross-sectional area than the screen discharge space V2 may communicate with the screen discharge space V2 in the direction of gravity.

Here, in the case of the present embodiment, the downstream portion 138b of the first oil return passage 138 is between the screen 730 and the upstream portion 138a of the first oil return passage 138 to recover the first oil. As the screen 730 serves as a screen inlet space V1 having a larger cross-sectional flow area than the upstream portion 138a of the flow path 138, the screen 730 moves from the upper surface 712b of the first compression part to the lower surface of the first compression part. (712a) is formed so as not to be spaced apart. However, it is not limited thereto, and for example, the downstream portion 138b of the first oil return channel 138 is formed to have a flow cross-sectional area equal to that of the upstream portion 138a of the first oil return channel 138. The screen 730 may be formed to be spaced apart from the upper surface 712b of the first compression part toward the lower surface 712a of the first compression part so that the screen inlet space V1 is provided.

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

That is, when power is applied to the motor 200 , the rotating shaft 300 may rotate together with the rotor 220 .

In addition, the orbiting scroll 400 may receive rotational force from the rotary shaft 300 through the eccentric bush and perform a orbital motion.

Accordingly, the compression chamber (S2) can be reduced in volume while continuously moving toward the center.

Also, the refrigerant in the suction chamber S1 may flow into the compression chamber S2 through the suction port 532 .

Also, the refrigerant sucked into the compression chamber (S2) may be compressed while moving toward the center along the moving path of the compression chamber (S2) and discharged to the discharge chamber (S3) through the discharge port (540).

In addition, the refrigerant discharged into the discharge chamber (S3) may pass through the oil separation chamber (S4) and be separated from the oil contained therein, and then discharged to the outside of the housing (100).

Meanwhile, the oil separated from the refrigerant in the oil separation chamber S4 flows through the first oil return passage 138, the sealing opening 716, and the second oil return passage 560 to and from the suction chamber S1. At least one of the back pressure chambers may be recovered. At this time, foreign substances contained in the oil may be collected by the screen 730 .

Here, the scroll compressor according to the present embodiment is integrally formed with the lid part 720 opening and closing the discharge port 540 and the lid part 720, and the fixed scroll 500 and the rear housing 130 The plate 700 having the compression portion 710 that is fixed by compression and seals between the fixed scroll 500 and the rear housing 130 while supporting the lead portion 720 , The plate 700 can replace the conventional discharge valve, fastening bolt and sealing member. Accordingly, the number of parts and the number of manufacturing processes may be reduced, thereby reducing manufacturing cost and reducing the possibility of quality problems.

In addition, as the rear housing 130 includes the post portion 139 and the post portion 139 includes the retainer surface 139a, the rigidity of the rear housing head plate 132 is improved. Instead, when the lead part 720 opens the discharge port 540, it contacts the retainer surface 139a so that the open amount of the lead part 720 may be limited. That is, the post part 139 can replace the conventional valve retainer. Accordingly, the number of parts and the number of manufacturing processes may be further reduced, thereby further reducing manufacturing cost and further reducing the possibility of quality problems.

In addition, as the required space of the plate 700 is smaller than that of the conventional discharge valve, valve retainer, fastening bolt, and sealing member, design freedom can be increased.

Further, as the compression portion 710 has an axial thickness greater than or equal to the axial distance between the fixed scroll 500 and the rear housing 130, the plate 700 is It can be sufficiently compressed and stably supported between the and the rear housing 130 .

And, the compression part 710 includes the first compression part 712 connected to the lead part 720 and the second compression part 714 extending from the first compression part 712, Since the thickness of the first compression part 712 in the axial direction and the thickness of the second compression part 714 in the axial direction are the same as each other, the compression part 710 can be uniformly compressed as a whole.

In addition, as the radial width of the first compression part 712 is larger than the radial width of the second compression part 714 , support rigidity of the lead part 720 may be improved.

In addition, the plate insertion groove 550 is provided, and the first compression part outer circumferential surface 712c, the first compression part inner circumferential surface 712d, the second compression part outer circumferential surface 714c, and the second compression part inner circumferential surface ( 714d) is in contact with the first side surface 552b of the first groove portion, the second side surface 552c of the first groove portion, the first side surface 554b of the second groove portion, and the second side surface 554c of the second groove portion. , the plate 700 can be prevented from being disengaged from a predetermined position in the radial and circumferential directions. That is, the plate 700 can be supported more stably.

In addition, the inner circumferential surface 712d of the first compression part includes the stepped surface 712da, and the second side surface 552c of the first groove part includes the support surface 552ca supporting the stepped surface 712da. Accordingly, the portion where the load due to the deformation of the lid part 720 acts greatly is supported in the radial and circumferential directions, so that the plate 700 can be supported more stably.

In addition, as the retainer surface 139a is inclined, the retainer surface 139a and the lead part 720 come into surface contact with each other, preventing noise and damage between the lead part 720 and the post part 139. This may be reduced, and durability of the lead part 720 and the post part 139 may be improved.

In addition, as the groove 139b is formed on the retainer surface 139a, noise and damage between the lead part 720 and the post part 139 are further reduced, and the lead part 720 and the post part 139 are further reduced. The durability of the portion 139 may be further improved.

In addition, as the sealing opening 716 is formed in the first compression part 712 and the screen 730 covering the sealing opening 716 is integrally formed with the first compression part 712. , The plate 700 can even play a role in separating foreign substances from oil. As a result, the number of parts and manufacturing cost can be further reduced, and the degree of freedom in design can be further improved.

In addition, as the sealing opening 716 and the screen 730 have a larger cross-sectional flow area than the first oil return passage 138 and the second oil return passage 560, the oil can smoothly flow. There is, and the screening performance to filter out foreign substances can be improved.

In addition, as the screen inlet space V1 is formed upstream of the screen 730 and the screen discharge space V2 is formed downstream of the screen 730, the oil can flow more smoothly. , the screening performance can be further improved.

Also, the first oil return passage 138 (upstream part 138a in this embodiment) communicates with the screen inlet space V1 in a direction opposite to the gravity, and the second oil return passage 560 As it communicates with the gravity direction side of the screen discharge space (V2), the oil can flow more smoothly under the influence of gravity.

In addition, as the second oil return passage 560 is formed on the side of the gravity direction than the first oil return passage 138, the oil and foreign substances discharged from the first oil return passage 138 are removed from the screen 730. After being dispersed and passed through the entire area of ), it may be introduced into the second oil recovery passage 560 . As a result, only a partial area of the screen 730 is prevented from being used, so that shortening of the lifespan of the screen 730 and deterioration of screening performance can be prevented.

Meanwhile, the scroll compressor according to the present embodiment assumes that the fixed scroll 500 is accommodated inside the housing 100, but is not limited thereto. That is, although not separately shown, the fixed scroll 500 is exposed to the outside of the housing 100, and the annular rear housing side plate 134 can be fastened to the outer circumferential portion of the fixed scroll 500. At this time, the plate 700 may be compressed between the outer circumference of the fixed scroll 500 and the side plate 134 of the rear housing.

130: rear housing
138: first oil return passage
400: turning scroll
500: fixed scroll
540: discharge port
560: second oil return passage
700: plate
710: compression unit
716: sealing opening
720: lead part
730: screen
V1: screen inlet space
V2: screen discharge space

Claims (13)

an orbiting scroll that is orbitally moved by receiving power;
a fixed scroll forming a compression chamber together with the orbiting scroll;
a rear housing having a suction chamber accommodating the refrigerant to be introduced into the compression chamber and a discharge chamber accommodating the refrigerant discharged from the compression chamber;
an oil recovery passage for recovering oil separated from the refrigerant of the rear housing; and
and a plate that seals between the suction chamber and the discharge chamber and separates foreign substances from the oil passing through the oil return passage. According to claim 1,
The plate includes a compression portion compressed by the fixed scroll and the rear housing, and a lead portion extending from the compression portion and opening and closing a discharge port of the fixed scroll. According to claim 2,
The rear housing further includes an annular wall partitioning the suction chamber and the discharge chamber;
The compression unit is disposed to be compressed between the annular wall and the fixed scroll, and includes a first compression unit connected to the lead unit and a second compression unit extending from the first compression unit and surrounding the lead unit. According to claim 3,
The second compression unit is formed to be compressed by the annular wall and the fixed scroll during assembly between the fixed scroll and the rear housing. According to claim 2,
The fixed scroll further includes a plurality of sub outlets for discharging the refrigerant before being compressed to the location of the outlet,
The scroll compressor further comprises a plurality of sub-lead parts for opening and closing the plurality of sub-discharge ports. According to claim 2,
The oil return passage includes a first oil return passage formed in the rear housing and a second oil return passage formed in the fixed scroll;
The plate includes a sealing opening surrounding a communication portion between the first oil return passage and the second oil return passage and a screen formed in the sealing opening. According to claim 6,
The axial thickness of the screen is formed smaller than the axial length of the sealing opening. According to claim 7,
A screen inlet space is formed between the screen and the first oil return passage,
A scroll compressor in which a screen discharge space is formed between the screen and the second oil return passage. According to claim 8,
A scroll compressor in which a flow cross-sectional area of the screen inlet space is larger than a flow cross-sectional area of the first oil return passage. According to claim 9,
The first oil return passage is a scroll compressor that communicates with a side opposite to the gravity of the screen inlet space. According to claim 8,
A scroll compressor in which a cross-sectional flow area of the screen discharge space is larger than a cross-sectional flow area of the second oil return passage. According to claim 11,
The second oil return passage is in communication with the gravitational direction side of the screen discharge space scroll compressor. According to claim 6,
The lead part, the compression part and the screen are integrally formed scroll compressor.

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