KR20230161246A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor, comprising: a shaft rotated by a drive source; a turning scroll driven in a turning motion by the shaft; a fixed scroll engaged with the orbiting scroll; and a main frame including a back pressure chamber that presses the orbiting scroll toward the fixed scroll, wherein the back pressure chamber side of the orbiting scroll includes an annular groove extending along an outer periphery of the orbiting scroll, and the groove includes An annular sealing member for sealing the back pressure chamber is inserted, the sealing member includes one end and another end that are separable from each other, and at least a portion of the one end may overlap in the axial direction with at least a portion of the other end. there is.

Description

Scroll compressor{SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more specifically, to a scroll compressor capable of compressing refrigerant with a fixed scroll and a rotating scroll.

Generally, automobiles are equipped with air conditioning (A/C) for interior cooling and heating. The air conditioning device is a component of a cooling system and includes a compressor that compresses low-temperature, low-pressure gaseous refrigerant introduced from the evaporator into high-temperature, high-pressure gaseous refrigerant and sends it to the condenser.

The compressor includes a reciprocating type that compresses the refrigerant through the reciprocating motion of the piston and a rotary type that performs compression while rotating the piston. The reciprocating type includes a crank type that transmits power to a plurality of pistons using a crank depending on the power transmission method, a swash plate type that transmits power to a rotating shaft on which a swash plate is installed, and the rotating type uses a rotating rotary shaft and vanes. There is a vane rotary type that uses a rotating scroll and a scroll type that uses a fixed scroll.

Scroll compressors are widely used for refrigerant compression in air conditioning systems, etc., because they have the advantage of being able to obtain a relatively high compression ratio compared to other types of compressors and obtaining stable torque through smooth suction, compression, and discharge strokes of the refrigerant.

A conventional scroll compressor includes a drive source that generates rotational force, a shaft rotated by the drive source, an orbiting scroll that rotates by the shaft, and a fixed scroll that engages the orbiting scroll and forms a compression chamber with the orbiting scroll. do.

Here, the main frame facing the orbiting scroll includes a back pressure chamber that presses the orbiting scroll toward the fixed scroll, and the orbiting scroll includes an annular groove extending along the outer periphery of the back pressure chamber, and the groove includes An annular sealing member for sealing the back pressure chamber and an elastic member for pressing the sealing member toward the main frame are inserted. At this time, the elastic member not only improves the airtightness of the back pressure chamber by pressing the sealing member toward the main frame while adjusting its height according to the pressure of the back pressure chamber and the pressure of the compression chamber, but also moves toward the compression chamber like the back pressure chamber. By pressurizing the orbiting scroll, the airtightness of the compression chamber is also improved.

However, in such a conventional scroll compressor, as the elastic member is provided in addition to the sealing member, there is a problem in that the cost required to seal the back pressure chamber increases.

Republic of Korea Patent No. 10-1999325

Therefore, the purpose of the present invention is to provide a scroll compressor that can reduce the cost required to seal the back pressure chamber.

The present invention, in order to achieve the above-described object, includes a shaft rotated by a drive source; a turning scroll driven in a turning motion by the shaft; a fixed scroll engaged with the orbiting scroll; and a main frame including a back pressure chamber that presses the orbiting scroll toward the fixed scroll, wherein the back pressure chamber side of the orbiting scroll includes an annular groove extending along an outer periphery of the orbiting scroll, and the groove includes An annular sealing member for sealing the back pressure chamber is inserted, the sealing member includes one end and the other end that are separable from each other, and at least a part of the one end is axially overlapped with at least a part of the other end. Provides a compressor.

The one end and the other end may each include a first layer part forming a portion of the thickness of the sealing member and a second layer part forming the remainder of the thickness of the sealing member.

The first layer portion of the one end may overlap in the axial direction with the second layer portion of the other end, and the first layer portion of the other end may overlap the second layer portion of the one end in the axial direction.

The sealing member is installed in the groove so that the one end and the other end overlap each other in the axial direction when an external force is applied, and the sealing member may have elastic force in a direction in which the one end and the other end move away from each other.

The groove includes a base surface, an inner surface extending from an inner periphery of the base surface and facing the inner circumferential surface of the sealing member, and an outer surface extending from an outer periphery of the base surface and facing the outer circumferential surface of the sealing member, the main frame and the A back pressure plate for sliding is disposed between the sealing members, and the sealing member may be in close contact with the back pressure plate and an outer surface of the groove.

When no external force is applied to the sealing member, the outer diameter of the sealing member may be larger than the diameter of the outer surface of the groove.

The sealing member is formed as a linear member extending from the one end to the other end,

The one end may be slidably coupled to the other end.

The sealing member includes a first layer portion facing the base surface of the groove and a second layer portion facing the main frame, wherein the one end portion includes a first layer portion disposed on the first layer portion and the second layer portion. and a second layer portion disposed in the first layer portion and having a different phase from the first layer portion in the circumferential direction, wherein the other end is disposed in the first layer portion and the second layer portion. It may include a second layer other end that is disposed and has a different phase from the other end of the first layer in the circumferential direction.

One end of the first layer includes a 1-1 wide portion having the same width as the sealing member, and a 1-1 wide portion that protrudes in the circumferential direction from the 1-1 wide portion and has a narrower width than the 1-1 wide portion. a narrow portion and a 1-1 recessed portion forming a step between the 1-1 wide portion and the 1-1 narrow portion, and one end of the second layer having the same width as the sealing member; A wide portion, a 2-1 narrow portion that protrudes from the 2-1 wide portion in the circumferential direction and has a narrower width than the 2-1 wide portion, and the 2-1 wide portion and the 2-1 narrow portion. It includes a 2-1 depression forming a step therebetween, wherein the 2-1 wide portion overlaps the 1-1 narrow portion and the 1-1 depression in a height direction, and the 2-1 narrow portion The 1-1 narrow portion protrudes in the circumferential direction, and the 2-1 recessed portion may be disposed in a position that protrudes in the circumferential direction more than the 1-1 recessed portion.

The other end of the first layer includes a 1-2 wide portion having the same width as the sealing member, and a 1-2 wide portion that protrudes in the circumferential direction from the 1-2 wide portion and has a narrower width than the 1-2 wide portion. It includes 2 narrow portions and a 1-2 recessed portion forming a step between the 1-2 wide portion and the 1-2 narrow portion, and the other end of the second layer has a second width having the same width as the sealing member. -2 wide portion, a 2-2 narrow portion that protrudes in the circumferential direction from the 2-2 wide portion and has a narrower width than the 2-2 wide portion, and the 2-2 wide portion and the 2-2 It includes a 2-2 depression forming a step between the narrow portions, wherein the 1-2 wide portion overlaps the 2-2 narrow portion and the 2-2 depression in a height direction, and the 1-2 The narrow portion protrudes in the circumferential direction more than the 2-2 narrow portion, and the 1-2 recessed portion may be disposed in a position that protrudes in the circumferential direction more than the 2-2 recessed portion.

The 1-1 narrow portion is slidably received in the 1-2 depression and overlaps the 2-1 wide portion in the height direction, and the 1-2 narrow portion slides in the 1-1 depression. can be accommodated in the height direction and overlaps the 2-1 wide portion, and the 2-1 narrow portion is slidably accommodated in the 2-2 recessed portion and overlaps the 1-2 wide portion in the height direction. And, the 2-2 narrow portion is slidably accommodated in the 2-1 recessed portion and may overlap the 1-2 wide portion in the height direction.

A gap between the front end surface of the 1-2 narrow portion and the front end surface of the 1-1 wide portion is shielded in the radial direction by the 1-1 narrow portion, and the front end surface of the 1-1 narrow portion and the first The gap between the front end surfaces of the -2 wide portion is shielded in the radial direction by the 1-2 narrow portion, and the gap between the front end surfaces of the 2-2 narrow portion and the front end surface of the 2-1 wide portion is the 2- 1 is shielded in the radial direction by the narrow portion, and a gap between the front end surface of the 2-1 narrow portion and the front end surface of the 2-2 wide portion may be shielded in the radial direction by the 2-2 narrow portion.

The gap between the front end surface of the 1-2 narrow section and the front end surface of the 1-1 wide section and the gap between the inner peripheral surface of the 1-1 narrow section and the outer peripheral surface of the 1-2 narrow section are in the 2-1 wide section. is shielded in the height direction, and the gap between the front end surface of the 2-1 narrow portion and the front end surface of the 2-2 wide portion and the gap between the inner peripheral surface of the 2-1 narrow portion and the outer peripheral surface of the 2-2 narrow portion are It is shielded in the height direction by the 1-2 wide part, and the gap between the front end surface of the 1-1 narrow part and the front end surface of the 1-2 wide part is shielded in the height direction by the 2-1 narrow part. , the gap between the front end surface of the 2-2 narrow portion and the front end surface of the 2-1 wide portion may be shielded in the height direction by the 1-2 narrow portion.

The base surface of the groove may be inclined in a direction where the distance from the main frame decreases as it goes outward in the radial direction.

When the gap between the main frame and the orbiting scroll increases, the sealing member moves along the base surface of the groove and the outer diameter increases in the radial direction, and when the gap between the main frame and the orbiting scroll decreases, the sealing member moves along the groove. It moves along the basal surface of and the outer diameter can be reduced in the radial direction.

A scroll compressor according to the present invention includes a shaft rotated by a drive source; a turning scroll driven in a turning motion by the shaft; a fixed scroll engaged with the orbiting scroll; and a main frame including a back pressure chamber that presses the orbiting scroll toward the fixed scroll, wherein the back pressure chamber side of the orbiting scroll includes an annular groove extending along an outer periphery of the orbiting scroll, and the groove includes An annular sealing member for sealing the back pressure chamber is inserted, the sealing member includes one end and the other end that are separable from each other, and at least a portion of the one end overlaps with at least a portion of the other end in the axial direction. , the cost required to seal the back pressure chamber can be reduced.

1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention;
Figure 2 is an enlarged cross-sectional view of part A of Figure 1;
Figure 3 is a front view showing the sealing member removed from the scroll compressor of Figure 1;
Figure 4 is an enlarged perspective view of part C of Figure 3;
Figure 5 is a front view showing a state in which one end and the other end of the sealing member of Figure 3 are joined when inserted into the groove of the orbiting scroll;
Figure 6 is an enlarged perspective view of part D of Figure 5;
Figure 7 is an enlarged front view of part D of Figure 5;
8 is a cross-sectional view showing a scroll compressor according to another embodiment of the present invention;
Figure 9 is an enlarged cross-sectional view of part A of Figure 8;
Figure 10 is a cross-sectional view showing the sealing member when the orbiting scroll of Figure 9 moves away from the main frame;
Figure 11 is an enlarged cross-sectional view of part B of Figure 8;
FIG. 12 is a cross-sectional view showing the sealing member when the orbiting scroll of FIG. 11 moves away from the main frame.

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

Figure 1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing part A of Figure 1, and Figure 3 is a diagram showing the sealing member removed from the scroll compressor of Figure 1. It is a front view, FIG. 4 is an enlarged perspective view of part C of FIG. 3, and FIG. 5 is a front view showing a state in which one end and the other end are coupled when the sealing member of FIG. 3 is inserted into the groove of the orbiting scroll. , Figure 6 is an enlarged perspective view of part D of Figure 5, and Figure 7 is an enlarged front view of part D of Figure 5.

Referring to the attached FIGS. 1 to 7, the scroll compressor according to an embodiment of the present invention includes a housing 100, a drive source 200 provided inside the housing 100 and generating a rotational force, and the drive source ( A shaft 300 rotated by 200, an eccentric bush 400 that converts the rotational movement of the shaft 300 into an eccentric rotational movement, a orbital scroll 500 that rotates by the eccentric bush 400, and the It may include a fixed scroll 600 engaged with the orbiting scroll 500 to form a compression chamber together with the orbiting scroll 500.

The housing 100 includes a center housing 110, a front housing 120 that is fastened to one side of the center housing 110 and forms a drive source accommodation space in which the drive source 200 is accommodated, and the center housing 110. It may include a rear housing 130 that is fastened to the other side and forms a scroll accommodating space in which the orbiting scroll 500 and the fixed scroll 600 are accommodated, and a discharge chamber in which the refrigerant discharged from the compression chamber is accommodated.

The center housing 110 includes a main frame 112 that divides the drive source accommodating space and the scroll accommodating space and supports the orbiting scroll 500, and a center housing side plate ( 114) may be included.

The main frame 112 is formed in a substantially disk shape, and at the center of the main frame 112 is a axial hole 112a through which one end 710 of the shaft 300 passes and the orbiting scroll 500. A back pressure chamber 112b that applies pressure toward the fixed scroll 600 may be formed. Here, one end 710 of the shaft 300 is coupled to the eccentric bush 400, and the back pressure chamber 112b can provide a space in which the eccentric bush 400 can rotate.

Meanwhile, the main frame 112 may further include a back pressure plate 112c for sliding on a surface opposite to the orbiting scroll 500.

The front housing 120 protrudes from a front housing head plate 122 that faces the main frame 112 and supports the other end 720 of the shaft 300 and an outer peripheral portion of the front housing head plate 122. It may include a front housing side plate 124 that is coupled to the center housing side plate 114 and supports the drive source 200.

The rear housing 130 includes a rear housing end plate 132 facing the main frame 112 and a rear housing side plate 134 that protrudes from the outer periphery of the rear housing end plate 132 and is fastened to the center housing side plate 114. ) may include.

The drive source 200 is formed as a motor having a stator 210 and a rotor 220, but is not limited thereto, and may also be formed as a disk hub assembly linked to a vehicle engine.

In addition, the shaft 300 is fastened to the rotor 220 and passes through the rotor 220 so that one end 710 of the shaft 300 is connected to the shaft hole 112a of the main frame 112. It is coupled to the eccentric bush 400 and the other end 720 of the shaft 300 may be supported on the front housing head plate 122.

The orbiting scroll 500 is interposed between the main frame 112 and the fixed scroll 600, and includes a disc-shaped orbiting scroll head plate 510, and the fixed scroll 600 from the center of the orbiting scroll head plate 510. ) an orbiting scroll wrap 520 protruding to the side, an orbiting scroll boss 530 protruding from the center of the orbiting scroll end plate 510 to the opposite side of the orbiting scroll wrap 520 and engaged with the eccentric bush 400, and An annular groove 540 is formed engraved on the outer periphery of the orbiting scroll head plate 510 from the surface opposite to the main frame 112 (hereinafter referred to as back pressure surface) and extends along the outer periphery of the orbiting scroll head plate 510. In addition, an annular sealing member 700 for sealing the back pressure chamber 112b may be inserted into the groove 540.

Here, as shown in FIG. 2, the groove 540 extends from the inner periphery of the base surface 542 to the back pressure surface 542 spaced apart from the back pressure surface to the opposite side of the back pressure chamber 112b. It includes an inner surface 544 facing the inner peripheral surface of the sealing member 700 and an outer surface 546 extending from the outer peripheral part of the base surface 542 to the back pressure surface and facing the outer peripheral surface of the sealing member 700. can do.

At this time, the width between the inner surface 544 and the outer surface 546 may be wider than the width between the inner and outer peripheral surfaces of the sealing member 700.

As shown in FIGS. 3 to 7, the sealing member 700 is formed as a linear member extending from one end 710 to the other end 720, and the one end 710 is connected to the other end ( 720) and can be formed to be slidably coupled.

Additionally, one end 710 and the other end 720 of the sealing member 700 may be formed in a two-stage structure.

Specifically, the sealing member 700 may include a first layer portion (L1) facing the base surface 542 and a second layer portion (L2) facing the main frame 112.

At this time, the one end portion 710 is disposed on the first layer portion L1 and the second layer portion L2 and is disposed in the circumferential direction of the sealing member 700 ( Hereinafter, in the circumferential direction, it may include a second layer end portion 710b having a different phase from the first layer end portion 710a.

The first layer end portion 710a includes a 1-1 wide portion 712a having the same radial width (hereinafter, width) as the sealing member 700, and a circumference from the 1-1 wide portion 712a. A 1-1 narrow portion (714a) that protrudes in the direction and has a narrower width than the 1-1 wide portion (712a), the 1-1 wide portion (712a), and the 1-1 narrow portion (714a) It may include a 1-1 recessed portion 716a forming a step therebetween.

The second layer end portion 710b has a 2-1 wide portion 712b having the same width as the sealing member 700, protrudes in the circumferential direction from the 2-1 wide portion 712b, and has the second wide portion 712b. -A 2-1 narrow portion 714b having a narrower width than the 1 wide portion 712b, and a second portion forming a step between the 2-1 wide portion 712b and the 2-1 narrow portion 714b. -1 may include a depression 716b.

Here, the 2-1 wide portion 712b is divided into the 1-1 narrow portion 714a and the 1-1 recessed portion 716a in the height direction (hereinafter, height direction) of the sealing member 700. overlaps with, the 2-1 narrow portion 714b protrudes in the circumferential direction beyond the 1-1 narrow portion 714a, and the 2-1 recessed portion 716b is the 1-1 recessed portion. It may be disposed in a position that protrudes in the circumferential direction from 716a.

The other end 720 is a first layer other end 720a disposed on the first layer portion L1 and a first layer other end 720a disposed on the second layer portion L2 and in the circumferential direction. It may include a second layer other end portion 720b having a phase different from that of the second layer.

The other end of the first layer 720a includes a 1-2 wide portion 722a having the same width as the sealing member 700, protrudes in the circumferential direction from the 1-2 wide portion 722a, and forms the first wide portion 722a. -2 A 1-2 narrow portion 724a having a narrower width than the wide portion 722a, and a first portion forming a step between the 1-2 wide portion 722a and the 1-2 narrow portion 724a. -2 may include a depression (726a).

The other end of the second layer 720b is a 2-2 wide portion 722b having the same width as the sealing member 700, protrudes in the circumferential direction from the 2-2 wide portion 722b, and has the second wide portion 722b. -2 a 2-2 narrow portion 724b having a narrower width than the wide portion 722b, and a second portion forming a step between the 2-2 wide portion 722b and the 2-2 narrow portion 724b. -2 may include a recessed portion 726b.

Here, the 1-2 wide portion 722a overlaps the 2-2 narrow portion 724b and the 2-2 recessed portion 726b in the height direction, and the 1-2 narrow portion 724a ) protrudes in the circumferential direction more than the 2-2 narrow portion 724b, and the 1-2 recessed portion 726a will be disposed at a position that protrudes in the circumferential direction more than the 2-2 recessed portion 726b. You can.

As shown in FIGS. 3 and 4, when no external force is applied to the sealing member 700, the one end 710 and the other end 720 open in a direction away from each other, causing the sealing member The outer diameter of 700 may be larger than the diameter of the outer surface 546 of the groove 540.

And, as shown in FIGS. 5 to 7, the sealing member 700 is retracted in a direction in which the one end 710 and the other end 720 approach each other, forming the 1-1 narrow portion. (714a) is slidably received in the 1-2 recessed portion 726a and overlaps the 2-1 wide portion 712b in the height direction, and the 1-2 narrow portion 724a is the second recessed portion 726a. It is slidably accommodated in the 1-1 recessed portion 716a and overlaps the 2-1 wide portion 712b in the height direction, and the 2-1 narrow portion 714b is the 2-2 recessed portion ( 726b) and overlaps the 1-2 wide portion 722a in the height direction, and the 2-2 narrow portion 724b is slidable in the 2-1 recessed portion 716b. It can be accommodated, overlap the first-second wide portion 722a in the height direction, and then be inserted into the groove 540.

The fixed scroll 600 includes a disk-shaped fixed scroll end plate 610, a fixed scroll wrap 620 that protrudes from the center of the fixed scroll end plate 610 and engages with the orbiting scroll wrap 520, and a compression chamber. It may include a discharge port 630 penetrating the fixed scroll head plate 610 at the center of the fixed scroll head plate 610 to discharge the refrigerant toward the discharge chamber.

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

That is, when power is applied to the drive source 200, the shaft 300 rotates together with the rotor 220, and the orbiting scroll 500 moves the shaft 300 through the eccentric bush 400. A series of processes in which the refrigerant is sucked into the compression chamber, compressed, and then discharged into the discharge chamber may be repeated through the pivot movement of the orbiting scroll 500.

Here, in the scroll compressor according to this embodiment, the width between the inner surface 544 and the outer surface 546 of the groove 540 is formed to be wider than the width between the inner peripheral surface and the outer peripheral surface of the sealing member 700, Fluid in the back pressure chamber 112b flows into the groove 540, and the sealing member 700 is pressurized by the pressure of the fluid flowing into the groove 540 to contact the back pressure plate 112c. . That is, even if the conventional elastic member is deleted, the sealing member 700 can be pressed toward the back pressure plate 112c with only the sealing member 700 and the fluid accommodated in the groove 540. As a result, the cost required to seal the back pressure chamber 112b can be reduced.

In addition, as the sealing member 700 includes the one end 710 and the other end 720 that are slidably coupled to each other, the outer diameter of the sealing member 700 may be varied. Also, when the sealing member 700 is removed from the groove 540, its outer diameter may be larger than the diameter of the outer surface 546 of the groove 540. Accordingly, the sealing member 700 can be easily inserted into the groove 540 by retracting the one end 710 and the other end 720. In addition, the sealing member 700 inserted into the groove 540 is in close contact with the outer surface 546 of the groove 540 by elastic restoring force, so that the sealing member 700 and the inside of the groove 540 A flow path through which the fluid in the back pressure chamber 112b can flow into the groove 540 can be secured between the side surfaces 544, and the fluid flowing into the groove 540 flows between the sealing member 700 and the groove 540. Leakage between the outer surfaces 546 of the grooves 540 can be prevented. Here, the sealing member 700 includes one end 710 and the other end 720 so that the outer diameter is variable, and the back pressure chamber (720) passes between the one end 710 and the other end 720. The fluid in 112b) may leak. However, in the case of this embodiment, as the one end 710 and the other end 720 of the sealing member 700 are formed in the two-stage structure, the fluid in the back pressure chamber 112b flows into the one end 710. Leakage through between and the other end 720 can be suppressed.

Specifically, the gap between the front end surface of the 1-2 narrow portion 724a and the front end surface of the 1-1 wide portion 712a is shielded in the radial direction by the 1-1 narrow portion 714a. , the gap between the front end surface of the 1-1 narrow portion 714a and the front end surface of the 1-2 wide portion 722a is shielded in the radial direction by the 1-2 narrow portion 724a, The gap between the front end surface of the 2-2 narrow portion 724b and the front end surface of the 2-1 wide portion 712b is shielded in the radial direction by the 2-1 narrow portion 714b, and the second -1 The gap between the front end surface of the narrow portion 714b and the front end surface of the 2-2 wide portion 722b is shielded in the radial direction by the 2-2 narrow portion 724b, so that the back pressure chamber ( Leakage of the fluid in 112b) in the radial direction can be suppressed.

And, the gap between the front end surface of the 1-2 narrow portion 724a and the front end surface of the 1-1 wide portion 712a and the inner peripheral surface of the 1-1 narrow portion 714a and the 1-2 The gap between the outer peripheral surface of the narrow portion 724a is shielded in the height direction by the 2-1 wide portion 712b, and the front end surface of the 2-1 narrow portion 714b and the 2-2 wide portion ( The gap between the front end surfaces of 722b) and the gap between the inner peripheral surface of the 2-1 narrow portion 714b and the outer peripheral surface of the 2-2 narrow portion 724b are spaced in the height direction by the 1-2 wide portion 722a. is shielded, and the gap between the front end surface of the 1-1 narrow portion 714a and the front end surface of the 1-2 wide portion 722a is shielded in the height direction by the 2-1 narrow portion 714b. As the gap between the front end surface of the 2-2 narrow portion 724b and the front end surface of the 2-1 wide portion 712b is shielded in the height direction by the 1-2 narrow portion 724a. , leakage of the fluid in the back pressure chamber 112b in the height direction can be suppressed.

Meanwhile, in the present embodiment, one end 710 and the other end 720 of the sealing member 700 are formed in the two-stage structure, but the structure is not necessarily limited to this. For example, although not separately shown, one end 710 and the other end 720 of the sealing member 700 may be formed in a one-stage structure. That is, the one end portion 710 includes a first wide portion having the same width as the sealing member 700, and a first narrow portion that protrudes in the circumferential direction from the first wide portion and has a narrower width than the first wide portion. and a first recessed portion forming a step between the first wide portion and the first narrow portion, wherein the other end portion 720 is a second wide portion having the same width as the sealing member 700, and the second wide portion has the same width as the sealing member 700. a second narrow portion protruding from the wide portion in the circumferential direction and having a narrower width than the second wide portion; and a second recessed portion forming a step between the second wide portion and the second narrow portion, wherein the first narrow portion The second recessed portion may be slidably received in the second recessed portion, and the second narrow portion may be slidably accommodated in the first recessed portion. Alternatively, one end 710 and the other end 720 of the sealing member 700 may be formed in a multi-stage structure with three or more stages. However, when formed in the single-stage structure, leakage of the refrigerant in the back pressure chamber 112b in the radial direction can be suppressed, but leakage in the height direction is difficult to suppress, and when formed in the multi-stage structure with three or more stages, the cost increases. Therefore, it may be desirable for the one end 710 and the other end 720 of the sealing member 700 to be formed in a two-stage structure as in this embodiment.

Meanwhile, in this embodiment, the base surface 542 of the groove 540 is formed parallel to the main frame 112, but in this case, the sealing member 700 is operated only by the pressure of the groove 540. It is pressed toward 112c), and the elastic restoring force of the sealing member 700 may interfere with the behavior of the sealing member 700 due to the pressure of the groove 540. That is, the sealing member 700 is in close contact with the outer surface 546 of the groove 540 by elastic restoring force, and the close contact between the sealing member 700 and the outer surface 546 of the groove 540 is The pressure of the groove 540 may act as resistance to the movement of the sealing member 700. Considering this, the base surface 542 of the groove 540 may be formed to be inclined as shown in FIGS. 8 to 12.

Figure 8 is a cross-sectional view showing a scroll compressor according to another embodiment of the present invention, Figure 9 is an enlarged cross-sectional view of portion A of Figure 8, and Figure 10 is a case where the orbiting scroll of Figure 9 moves away from the main frame. It is a cross-sectional view showing the sealing member, FIG. 11 is an enlarged cross-sectional view of part B of FIG. 8, and FIG. 12 is a cross-sectional view showing the sealing member when the orbiting scroll of FIG. 11 moves away from the main frame.

For the convenience of drawing description, the same reference numerals are given to parts that are the same or substantially the same as the above and illustrated embodiments, and overlapping descriptions of some components may be omitted.

Referring to the attached FIGS. 8 to 12, the base surface 542 may be formed to be inclined in a direction where the distance from the main frame 112 decreases toward the radial outer side of the groove 540.

In this case, the base surface 542 of the groove 540 is formed to be inclined, and the sealing member 700 includes the one end 710 and the other end 720 that are slidably coupled to each other, The sealing member 700 is guided by the base surface 542 and the outer diameter of the sealing member 700 can be varied. In addition, the base surface 542 of the groove 540 is inclined in a direction where the distance from the main frame 112 decreases in the radial direction, and the sealing member 700 is removed from the groove 540. At this time, as the outer diameter of the groove 540 is formed larger than the diameter of the outer surface 546, the sealing member 700 inserted into the groove 540 has an outer diameter increased by elastic restoring force, and the base surface 542 It may be guided by and pressed toward the back pressure plate 112c. That is, the sealing member 700 is operated by the back pressure plate not only by the pressure of the fluid in the groove 540 but also by the interaction between the elastic restoring force of the sealing member 700 and the inclined base surface 542 of the groove 540. It can be pressed toward the (112c) side. Accordingly, the back pressure chamber 112b can be sealed more reliably.

Specifically, the pressure of the back pressure chamber 112b may increase, and the orbiting scroll 500 may move toward the fixed scroll 600. That is, the state shown in FIGS. 9 and 11 can be changed to the state shown in FIGS. 10 and 12. Accordingly, the gap between the back pressure plate 112c and the orbiting scroll 500 may increase. In this case, the sealing member 700 is operated by the pressure of the fluid flowing into the groove 540 and the interaction between the elastic restoring force of the sealing member 700 and the inclined base surface 542 of the groove 540. As it moves toward the back pressure plate 112c and comes into contact with the back pressure plate 112c, the back pressure chamber 112b can be sealed. Here, as the pressure of the fluid flowing into the groove 540 increases to a level equivalent to the increased pressure of the back pressure chamber 112b, the sealing member 700 may be quickly moved toward the back pressure plate 112c. and the contact force between the sealing member 700 and the back pressure plate 112c can be increased. In addition, compared to the case where only the pressure of the fluid flowing into the groove 540 acts on the sealing member 700, the elastic restoring force of the sealing member 700 and the inclined base surface 542 of the groove 540 As more action is applied to the sealing member 700, the sealing member 700 can be moved more quickly toward the back pressure plate 112c, and between the seal member 700 and the back pressure plate 112c. Contact force can be further increased. Meanwhile, in this case, the contact force between the sealing member 700 and the back pressure plate 112c due to the pressure of the groove 540 is increased compared to the previous state due to an increase in the pressure of the back pressure chamber 112b, but the sealing member The contact force between the sealing member 700 and the back pressure plate 112c due to the interaction between the elastic restoring force of 700 and the inclined base surface 542 of the groove 540 increases the diameter of the sealing member 700. It may be reduced compared to the previous state due to a decrease in the amount of deformation and a decrease in elastic restoration force. Accordingly, excessive increase in contact force between the sealing member 700 and the back pressure plate 112c can be prevented.

On the other hand, the pressure in the back pressure chamber 112b is reduced, so that the orbiting scroll 500 can be moved toward the main frame 112. That is, the state shown in FIGS. 10 and 12 can be changed to the state shown in FIGS. 9 and 11. Accordingly, the gap between the back pressure plate 112c and the orbiting scroll 500 can be reduced. In this case, the sealing member 700 is in contact with the back pressure plate 112c and is guided by the inclined base surface 542 of the groove 540 in a state of sealing the back pressure chamber 112b, and the outer diameter is reduced. It may be further inserted into the groove 540. Here, the pressure of the fluid flowing into the groove 540 is reduced to a level equivalent to the reduced pressure of the back pressure chamber 112b, but the elastic restoring force of the sealing member 700 and the inclined base surface of the groove 540 As the sealing member 700 is pressed toward the back pressure plate 112c due to the interaction between (542), the contact force between the seal member 700 and the back pressure plate 112c can be maintained. That is, the contact force between the sealing member 700 and the back pressure plate 112c due to the pressure of the groove 540 is reduced compared to the previous state due to a decrease in the pressure of the back pressure chamber 112b, but the sealing member 700 The contact force between the sealing member 700 and the back pressure plate 112c due to the interaction between the elastic restoring force and the inclined base surface 542 of the groove 540 increases the amount of deformation as the diameter of the sealing member 700 decreases. And it can be increased from the previous state by increasing the elastic restoring force. Accordingly, a decrease in contact force between the sealing member 700 and the back pressure plate 112c can be suppressed.

Meanwhile, even if there is no change in the pressure of the back pressure chamber 112b, when the pressure of the compression chamber decreases, the orbiting scroll 500 moves toward the fixed scroll 600, and when the pressure of the compression chamber increases, the orbiting scroll 500 moves toward the fixed scroll 600. The scroll 500 may be moved toward the back pressure plate 112c, and in these cases as well, by the pressure of the groove 540, the elastic restoring force of the sealing member 700, and the groove 540. Due to the interaction between the inclined base surfaces 542, the sealing member 700 can stably contact the back pressure plate 112c and seal the back pressure chamber 112b.

112: main frame
112b: Back pressure chamber
112c: back pressure plate
200: Drive source
300: shaft
500: Orbiting scroll
540: Home
542: basal plane
544: medial side
546: outer surface
600: Fixed scroll
700: sealing member
710: one end
710a: one end of the first layer
710b: one end of the second layer
712a: 1-1 wide section
712b: 2-1 wide section
714a: 1-1 narrow part
714b: 2-1 narrow part
716a: 1-1 depression
716b: 2-1 depression
720: Other end
720a: Other end of the first layer
720b: Other end of second layer
722a: 1-2 wide section
722b: 2-2 wide section
724a: 1-2 narrow part
724b: 2-2 narrow part
726a: 1-2 depression
726b: 2-2 depression
L1: first layer part
L2: Second layer part

Claims (15)

A shaft rotated by a driving source;
a turning scroll driven in a turning motion by the shaft;
a fixed scroll engaged with the orbiting scroll; and
A main frame including a back pressure chamber that presses the orbiting scroll toward the fixed scroll,
A side of the back pressure chamber of the orbiting scroll includes an annular groove extending along an outer periphery of the orbiting scroll,
An annular sealing member for sealing the back pressure chamber is inserted into the groove,
A scroll compressor wherein the sealing member includes one end and another end that are separable from each other, and at least a portion of the one end overlaps with at least a portion of the other end in the axial direction. According to paragraph 1,
The one end and the other end each include a first layer portion forming a portion of the thickness of the sealing member and a second layer portion forming the remainder of the thickness of the sealing member. According to paragraph 2,
A scroll compressor wherein the first layer portion of the one end portion axially overlaps the second layer portion of the other end portion, and the first layer portion of the other end portion axially overlaps the second layer portion of the one end portion. According to paragraph 1,
The sealing member is installed in the groove so that the one end and the other end overlap each other in the axial direction when an external force is applied,
The sealing member is a scroll compressor having elastic force in a direction in which the one end and the other end are away from each other. According to paragraph 1,
The groove includes a base surface, an inner surface extending from the inner circumference of the base surface and facing the inner circumference of the sealing member, and an outer surface extending from the outer circumference of the base surface and facing the outer circumference of the sealing member,
A back pressure plate for sliding is disposed between the main frame and the sealing member,
A scroll compressor wherein the sealing member is in close contact with an outer surface of the back pressure plate and the groove. According to clause 5,
A scroll compressor wherein when no external force is applied to the sealing member, the outer diameter of the sealing member is formed to be larger than the diameter of the outer surface of the groove. According to paragraph 1,
The sealing member is formed as a linear member extending from the one end to the other end,
A scroll compressor in which the one end is slidably coupled to the other end. In clause 7,
The sealing member includes a first layer portion facing the base surface of the groove and a second layer portion facing the main frame,
The one end portion includes a first layer end portion disposed in the first layer portion and a second layer end portion disposed in the second layer portion and having a different phase from the first layer end portion in the circumferential direction,
The other end is a scroll compressor including a first layer other end disposed in the first layer portion and a second layer other end disposed in the second layer portion and having a phase different from the first layer other end in the circumferential direction. . According to clause 8,
One end of the first layer includes a 1-1 wide portion having the same width as the sealing member, and a 1-1 wide portion that protrudes in the circumferential direction from the 1-1 wide portion and has a narrower width than the 1-1 wide portion. It includes a narrow portion and a 1-1 recessed portion forming a step between the 1-1 wide portion and the 1-1 narrow portion,
One end of the second layer includes a 2-1 wide portion having the same width as the sealing member, and a 2-1 wide portion that protrudes in the circumferential direction from the 2-1 wide portion and has a narrower width than the 2-1 wide portion. It includes a narrow portion and a 2-1 recessed portion forming a step between the 2-1 wide portion and the 2-1 narrow portion,
The 2-1 wide portion overlaps the 1-1 narrow portion and the 1-1 recessed portion in the height direction, and the 2-1 narrow portion protrudes in a circumferential direction beyond the 1-1 narrow portion, A scroll compressor in which the 2-1 recessed portion is disposed at a position protruding in a circumferential direction from the 1-1 recessed portion. According to clause 9,
The other end of the first layer includes a 1-2 wide portion having the same width as the sealing member, and a 1-2 wide portion that protrudes in the circumferential direction from the 1-2 wide portion and has a narrower width than the 1-2 wide portion. 2 narrow portions and a 1-2 recessed portion forming a step between the 1-2 wide portion and the 1-2 narrow portion,
The other end of the second layer includes a 2-2 wide portion having the same width as the sealing member, and a 2-2 wide portion that protrudes in the circumferential direction from the 2-2 wide portion and has a narrower width than the 2-2 wide portion. 2 narrow portions and a 2-2 recessed portion forming a step between the 2-2 wide portion and the 2-2 narrow portion,
The 1-2 wide portion overlaps the 2-2 narrow portion and the 2-2 recessed portion in the height direction, and the 1-2 narrow portion protrudes in the circumferential direction more than the 2-2 narrow portion, A scroll compressor wherein the 1-2 recessed portion is disposed in a position where the 1-2 recessed portion protrudes in a circumferential direction from the 2-2 recessed portion. According to clause 10,
The 1-1 narrow portion is slidably accommodated in the 1-2 recessed portion and overlaps the 2-1 wide portion in the height direction,
The 1-2 narrow portion is slidably accommodated in the 1-1 depression and overlaps the 2-1 wide portion in the height direction,
The 2-1 narrow portion is slidably accommodated in the 2-2 recessed portion and overlaps the 1-2 wide portion in the height direction,
A scroll compressor wherein the 2-2 narrow portion is slidably accommodated in the 2-1 recessed portion and overlaps the 1-2 wide portion in the height direction. According to clause 11,
A gap between the front end surface of the 1-2 narrow portion and the front end surface of the 1-1 wide portion is shielded in the radial direction by the 1-1 narrow portion,
A gap between the front end surface of the 1-1 narrow portion and the front end surface of the 1-2 wide portion is shielded in the radial direction by the 1-2 narrow portion,
A gap between the front end surface of the 2-2 narrow portion and the front end surface of the 2-1 wide portion is shielded in the radial direction by the 2-1 narrow portion,
A scroll compressor, characterized in that the gap between the front end surface of the 2-1 narrow portion and the front end surface of the 2-2 wide portion is shielded in the radial direction by the 2-2 narrow portion. According to clause 11,
The gap between the front end surface of the 1-2 narrow section and the front end surface of the 1-1 wide section and the gap between the inner peripheral surface of the 1-1 narrow section and the outer peripheral surface of the 1-2 narrow section are in the 2-1 wide section. is shielded in the height direction by
The gap between the front end surface of the 2-1 narrow section and the front end surface of the 2-2 wide section and the gap between the inner peripheral surface of the 2-1 narrow section and the outer peripheral surface of the 2-2 narrow section are in the 1-2 wide section. is shielded in the height direction by
A gap between the front end surface of the 1-1 narrow portion and the front end surface of the 1-2 wide portion is shielded in the height direction by the 2-1 narrow portion,
A scroll compressor, characterized in that the gap between the front end surface of the 2-2 narrow portion and the front end surface of the 2-1 wide portion is shielded in the height direction by the 1-2 narrow portion. According to paragraph 1,
A scroll compressor wherein the base surface of the groove is inclined in a direction where the distance from the main frame decreases as it goes outward in the radial direction. According to clause 14,
When the gap between the main frame and the orbiting scroll increases, the sealing member moves along the base surface of the groove and the outer diameter increases in the radial direction, and when the gap between the main frame and the orbiting scroll decreases, the sealing member moves along the groove. A scroll compressor whose outer diameter is reduced in the radial direction is moved along the basal surface of a scroll compressor.

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