Scroll Compressor

Abstract

An object of the present invention is to provide a scroll compressor capable of reducing noise and vibration caused by collision between a discharge valve and a tator. [Solution] The invention is characterized by including the housing, a motor provided inside the housing, a rotating shaft rotated by the motor, a rotating scroll that orbits with the rotating shaft, a fixed scroll that forms compression noise together with the orbiting scroll, a discharge valve that opens and closes a discharge port formed in the fixed scroll to discharge refrigerant from the compression chamber, a retainer that limits the opening degree of the discharge valve, and a post that contacts the retainer.

Description

[Technical field]

[0001] The present invention relates to a scroll compressor, and more particularly to a scroll compressor capable of compressing a refrigerant by means of a fixed scroll and an orbiting scroll. [Background technology]

[0002] Generally, an automobile is equipped with an air conditioning (A / C) system for heating and cooling the interior of the automobile. The air conditioning system is a cooling system that includes a compressor that compresses low-temperature and low-pressure gas-phase refrigerant introduced from an evaporator into high-temperature and high-pressure gas-phase refrigerant and sends it to a condenser. The compressor includes a reciprocating type that compresses the refrigerant through the reciprocating motion of pistons, and a rotary type that compresses the refrigerant while rotating. The reciprocating type includes a crank type that transmits power through multiple pistons using a crank, a swash plate type that transmits power to a rotating shaft equipped with a swash plate, etc., and the rotary type includes a vane rotary type that uses a rotating rotary shaft and vanes, and a scroll type that uses an orbiting scroll and a fixed scroll. Scroll compressors have the advantage that they can obtain a relatively high compression ratio compared to other types of compressors, and that the suction, compression, and discharge strokes of the refrigerant are smoothly connected to obtain stable torque, and therefore are widely used for compressing refrigerant in air conditioners and the like.

[0003] FIG. 1 is a cross-sectional view showing a conventional scroll compressor, FIG. 2 is a perspective view showing a rear housing, a fixed scroll, a discharge valve, and a retainer in the scroll compressor of FIG. 1, and FIG. 3 is an enlarged cross-sectional view showing part A in FIG. 2. As shown in the accompanying Figures 1 to 3, a conventional scroll compressor includes a housing 100, a motor 200 provided inside the housing 100, a rotating shaft 300 rotated by the motor 200, a rotating scroll 400 that orbits about the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and meshes with the orbiting scroll 400 to form a compression chamber. The housing 100 includes a center housing 110, a front housing 120 fastened to the center housing 110, and a rear housing 130 fastened to the center housing 110 on the opposite side of the front housing 120 with respect to the center housing 110.

[0004] The motor 200 is provided in a space formed by the front housing 120 and the center housing 110 . The rotating shaft 300 passes through the center housing 110 and extends from the motor 200 toward the rear housing 130 . The fixed scroll 500 is provided in a space formed by the rear housing 130 and the center housing 110 , and the orbiting scroll 400 is provided in a space formed by the fixed scroll 500 and the center housing 110 .

[0005] Here, the fixed scroll 500 includes a discharge port 540 that discharges the refrigerant from the compression chamber, the rear housing 130 includes a discharge chamber D that accommodates the refrigerant discharged from the discharge port 540, and a discharge valve 550 that opens and closes the discharge port 540 and a retainer 560 that limits the opening degree of the discharge valve 550 are fixed to the fixed scroll 500 by fastening bolts. In the conventional scroll compressor having such a configuration, when power is applied to the motor 200, the rotary shaft 300 rotates by the motor 200, the orbiting scroll 400 receives a rotational force from the rotary shaft 300 and orbits, and the compression chamber continuously moves toward the center and decreases in volume. In addition, refrigerant flows into the compression chamber and is compressed while moving toward the center along the movement path of the compression chamber. The compressed refrigerant is discharged to the discharge chamber D through the discharge port 540 opened and closed by the discharge valve 550, and then flows to the outside of the housing 100. However, in such a conventional scroll compressor, there is a problem that the discharge valve 550 collides with the retainer 560 when opening the discharge port 540, generating noise and vibration. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a scroll compressor capable of reducing noise and vibration caused by collision between a discharge valve and a tator. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a scroll compressor including a housing, a motor provided inside the housing, a rotating shaft rotated by the motor, a rotating scroll that orbits about the rotating shaft, a fixed scroll that forms a compression chamber together with the orbiting scroll, a discharge valve that opens and closes a discharge port formed in the fixed scroll to discharge refrigerant from the compression chamber, a retainer that limits the opening degree of the discharge valve, and a post that contacts the retainer.

[0008] The housing may include a rear housing having a discharge chamber that accommodates the refrigerant discharged from the discharge port, and the rear housing may include the post. The scroll compressor may further include an injection passage that introduces an intermediate pressure refrigerant to the compression chamber, and an injection valve assembly that opens and closes the injection passage, and the injection valve assembly may include the post. The retainer may be deformed toward the discharge valve by the post. An opening degree of the discharge valve when the retainer is in contact with the post may be smaller than an opening degree of the discharge valve when the retainer is not in contact with the post. The discharge valve may include an opening / closing portion facing the discharge port, the retainer may include an opening / closing limiting portion facing the opening / closing portion, and the post may contact the opening / closing limiting portion. The post may contact a central portion of the opening / closing limiter.

[0009] The housing may include a rear housing having a discharge chamber that accommodates refrigerant discharged from the discharge port, and the post may extend from the rear housing in a virtual axial direction at a location that intersects with a virtual axis that crosses the discharge port, the opening / closing portion, and the opening / closing limiting portion. The rear housing may include an oil separation chamber that separates oil from refrigerant, and the post may extend from a wall portion that defines the oil separation chamber. The housing may include an inlet chamber for accommodating an intermediate-pressure refrigerant, and may include a valve plate covering the inlet chamber and having an inlet communicating with the inlet chamber, an injection valve for opening and closing the inlet of the valve plate, and a cover plate having an outlet for guiding refrigerant that has passed through the injection valve to the compression chamber side, and the post may protrude in the imaginary axial direction from a portion of the cover plate that intersects with an imaginary axis that traverses the discharge port, the opening / closing portion, and the opening / closing limiting portion.

[0010] The cover plate may further include a rib that protrudes toward the fixed scroll and crosses the cover plate, and the post may protrude from the rib toward the retainer. A plurality of the ribs may be formed, the plurality of ribs being formed to intersect with each other, and the post may protrude from a portion where the plurality of ribs intersect with each other. The post may be formed so as to come into line contact with the opening / closing limiter. The linear end surface of the post may be formed so as to be perpendicular to an imaginary axis that crosses the discharge port, the opening / closing portion, and the opening / closing limiting portion.

[0011] The discharge port may include a main discharge port formed on the central side of the fixed scroll and a sub discharge port formed radially outward of the fixed scroll with respect to the main discharge port, the discharge valve may include a main opening / closing portion that opens and closes the main discharge port and a sub opening / closing portion that opens and closes the sub discharge port, the retainer may include a main opening / closing limiting portion that limits the opening degree of the main opening / closing portion and a sub opening / closing limiting portion that limits the opening degree of the sub opening / closing portion, and the post may be formed to contact the main opening / closing limiting portion. Effect of the Invention

[0012] According to the present invention, by including a scroll compressor, a housing, a motor provided inside the housing, a rotating shaft rotated by the motor, a rotating scroll that orbits about the rotating shaft, a fixed scroll that forms a compression chamber together with the orbiting scroll, a discharge valve that opens and closes a discharge port formed in the fixed scroll to discharge refrigerant in the compression chamber, a retainer that limits the opening degree of the discharge valve, and a post that contacts the retainer, it is possible to reduce noise and vibration caused by collision between the discharge valve and the retainer. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing a conventional scroll compressor. [Diagram 2] 2 is a perspective view showing a rear housing, a fixed scroll, a discharge valve, and a retainer in the scroll compressor of FIG. 1. [Diagram 3] FIG. 3 is an enlarged cross-sectional view showing a portion A in FIG. 2. [Figure 4] FIG. 2 is a perspective view showing a rear housing, a fixed scroll, a discharge valve, and a retainer in the scroll compressor of the present invention. [Diagram 5] FIG. 5 is an enlarged view of part B in FIG. [Figure 6] FIG. 5 is a cross-sectional view of FIG. [Figure 7] FIG. 7 is an enlarged view of part C in FIG. [Figure 8] FIG. 11 is a perspective view showing a rear housing, a fixed scroll, a discharge valve, a retainer, and an injection valve assembly in a scroll compressor according to another embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view showing an injection passage in the scroll compressor of FIG. 8. [Figure 10] FIG. 9 is an exploded perspective view of FIG. 8. [Figure 11] FIG. 9 is a perspective view of the rear housing and injection valve assembly of FIG. 8, as viewed from the fixed scroll, discharge valve, and retainer side. [Figure 12] FIG. 9 is an enlarged view of part D in FIG. [Figure 13] 13 is a cross-sectional view taken along line EE in FIG. 12. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 4 is an oblique view showing a rear housing, a fixed scroll, a discharge valve, and a retainer in the scroll compressor of the present invention, FIG. 5 is an enlarged view of part B in FIG. 4, FIG. 6 is a cross-sectional view of FIG. 4, and FIG. 7 is an enlarged view of part C in FIG. 6. On the other hand, for components not shown in FIGS. 4 to 7, reference will be made to FIG. 1 for convenience of explanation. As shown in the accompanying Figures 4 to 7 and Figure 1, the scroll compressor of the present invention includes a housing 100, a motor 200 that generates power inside the housing 100, a rotating shaft 300 that rotates by the motor 200, a rotating scroll 400 that orbits about the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and meshes with the orbiting scroll 400 to form a compression chamber.

[0015] The housing 100 may include a center housing 110, a front housing 120 that is fastened to the center housing 110 and forms a motor accommodating space in which a motor 200 is accommodated, and a rear housing 130 that is fastened to the center housing 110 on the opposite side of the front housing 120 based on the center housing 110 and forms a scroll accommodating space in which a rotating scroll 400 and a fixed scroll 500 are accommodated. The center housing 110 can include a main frame 112 that separates the motor accommodating space from the scroll accommodating space and supports the orbiting scroll 400 and the fixed scroll 500, and a center housing side plate 114 that protrudes from the outer periphery of the main frame 112 toward the front housing 120.

[0016] The main frame 112 is formed in a substantially disk shape, and a bearing hole through which one end of the rotating shaft 300 passes and a back pressure chamber for pressurizing the orbiting scroll 400 toward the fixed scroll 500 may be formed in the center of the main frame 112. Here, an eccentric bushing that converts the rotational motion of the rotating shaft 300 into the orbital motion of the orbiting scroll 400 is formed in one end of the rotating shaft 300, and the back pressure chamber can provide a space in which the eccentric bushing can rotate. The front housing 120 can include a front housing hard plate 122 that faces the main frame 112 and supports the other end of the rotating shaft 300, and a front housing side plate 124 that protrudes from the outer periphery of the front housing hard plate 122, fastens to the center housing side plate 114, and supports the motor 200.

[0017] The rear housing 130 may include a rear housing hard plate 132 facing the main frame 112 , and a rear housing side plate 134 protruding from the outer periphery of the rear housing hard plate 132 and fastened to the outer periphery of the main frame 112 . In addition, the rear housing 130 may further include a discharge chamber D that accommodates the refrigerant discharged from the compression chamber, an oil separation chamber V that separates oil from the refrigerant, an oil separation chamber inlet that connects the discharge chamber D to the oil separation chamber V, an oil separation chamber oil outlet that guides the oil separated from the refrigerant in the oil separation chamber V to the oil recovery flow path, and an oil separation chamber refrigerant outlet that guides the refrigerant separated from the oil in the oil separation chamber V to the outside. Additionally, the rear housing 130 may further include a post 136 that protrudes from the wall portion that defines the oil separation chamber V and that contacts a retainer 560, which will be described later.

[0018] Here, the post 136 may extend from any position on the inner wall surface of the rear housing 130. However, in order to minimize the extension length of the post 136, minimize the disruption of the refrigerant flow by the post 136, and also to improve the supporting force for the retainer 560 described below, it is preferable that the post 136 extend from a wall portion that forms an oil separation chamber V that faces the retainer 560 described below in the axial direction (the vertical direction in Figures 4 and 6), as in this embodiment. In addition, it is preferable that the post 136 extends in a virtual axial direction from a portion of the wall portion forming the oil separation chamber V that intersects with a virtual axis that cuts through the main discharge port 542, the main opening / closing portion 552, and the main opening / closing limiting portion 562 described below, so as to contact the main opening / closing limiting portion 562 of the retainer 560 described below.

[0019] Moreover, the post 136 is preferably formed so as to come into contact with the center of a main opening / closing limiting portion 562, which will be described later. Furthermore, it is preferable that post 136 is formed so that line end surface 136b of post 136 is perpendicular to the virtual axis, and that the corner between line end surface 136b of post 136 and outer peripheral surface 136a is formed so as to come into line contact with retainer 560 described below. Moreover, it is preferable that post 136 is formed not simply to come into contact with retainer 560 (described later), but to deform retainer 560 (described later) when it is pressed toward discharge valve 550 (described later). The motor 200 may include a stator 210 that is fixed to the front housing side plate 124 , and a rotor 220 that rotates within the stator 210 through interaction with the stator 210 .

[0020] The rotating shaft 300 may be fastened to the rotor 220 and pass through the center of the rotor 220, one end of the rotating shaft 300 may pass through a bearing hole of the main frame 112, and the other end of the rotating shaft 300 may be supported by the front housing hard plate 122. The orbiting scroll 400 is interposed between the main frame 112 and the fixed scroll 500, and can include a disk-shaped orbiting scroll hard plate 410, an orbiting scroll wrap 420 protruding from the center of the orbiting scroll hard plate 410 toward the fixed scroll 500, and an orbiting scroll boss 430 protruding from the center of the orbiting scroll hard plate 410 to the opposite side of the orbiting scroll wrap 420 and fastened to an eccentric bush.

[0021] The fixed scroll 500 can include a disk-shaped fixed scroll hard plate 510, a fixed scroll wrap 520 that protrudes from the center of the fixed scroll hard plate 510 and meshes with the orbiting scroll wrap 420, and a fixed scroll side plate 530 that protrudes from the outer periphery of the fixed scroll hard plate 510 and is fastened to the main frame 112 to form a rotation space for the orbiting scroll 400. Here, the fixed scroll hard plate 510 includes a discharge port 540 that discharges the refrigerant in the compression chamber to the discharge chamber D, and a discharge valve 550 that opens and closes the discharge port 540 and a retainer 560 that limits the opening degree of the discharge valve 550 can be fixed to the fixed scroll hard plate 510 by fastening bolts. Further, a plurality of discharge ports 540 may be formed to prevent the refrigerant from being excessively compressed, and the discharge valve 550 and the retainer 560 may be formed corresponding to the plurality of discharge ports 540 .

[0022] Specifically, the compression chamber includes a first compression chamber located on the radial centrifugal side of the scroll accommodating space, in which the refrigerant pressure is a first pressure, a second compression chamber located on the radial centrifugal side of the scroll accommodating space from the first compression chamber, in which the refrigerant pressure is a second pressure higher than the first pressure, and a third compression chamber located on the radial centrifugal side of the scroll accommodating space from the second compression chamber, in which the refrigerant pressure is a third pressure higher than the second pressure, and the first compression chamber, the second compression chamber, and the third compression chamber may each be provided in pairs. That is, the first compression chamber can include a first outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a first inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520.

[0023] In addition, the second compression chamber can include a second outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a second inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520. The third compression chamber can include a third outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a third inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520.

[0024] In this case, the discharge port 540 may include a main discharge port 542 formed on the center side of the fixed scroll hard plate 510 to discharge the refrigerant from the third outer compression chamber and the third inner compression chamber, a first sub-discharge port 542 formed radially outward of the fixed scroll hard plate 510 based on the main discharge port 542 to discharge the refrigerant from the second outer compression chamber, and a second sub-discharge port formed radially outward of the fixed scroll hard plate 510 based on the main discharge port 542 and on the opposite side of the first sub-discharge port based on the main discharge port 542 to discharge the refrigerant from the second inner compression chamber.

[0025] The discharge valve 550 may include a fastening portion 551 fastened to the fixed scroll hard plate 510, a main opening / closing portion 552 for opening and closing the main discharge port 542, a first sub-opening / closing portion 554 for opening and closing the first sub-discharge port, a second sub-opening / closing portion 556 for opening and closing the second sub-discharge port, a main lead portion 553 extending from the fastening portion 551 to the main opening / closing portion 552, a first sub-lead portion 555 extending from the fastening portion 551 to the first sub-opening / closing portion 554, and a second sub-lead portion extending from the fastening portion 551 to the second sub-opening / closing portion 556.

[0026] The retainer 560 includes a fixed portion 561 that is fastened to the fixed scroll hard plate 510 together with the fastening portion 551 of the discharge valve 550, a main opening / closing limiting portion 562 that faces a main opening / closing portion 552 of the discharge valve 550 and limits the opening amount of the main opening / closing portion 552, a first sub opening / closing limiting portion 564 that faces a first sub opening / closing portion 554 of the discharge valve 550 and limits the opening amount of the first sub opening / closing portion 554, and a second sub opening / closing limiting portion 565 that faces a second sub opening / closing portion 556 of the discharge valve 550 and limits the opening amount of the first sub opening / closing portion 554. It may include a second sub-opening / closing limiting portion 566 that limits the opening degree of the closing portion 556, a main lead limiting portion 563 extending from the fixed portion 561 to the main opening / closing limiting portion 562 and facing the main lead portion 553, a first sub-lead limiting portion 565 extending from the fixed portion 561 to the first sub-opening / closing limiting portion 564 and facing the first sub-lead portion 555, and a second sub-lead limiting portion 567 extending from the fixed portion 561 to the second sub-opening / closing limiting portion 566 and facing the second sub-lead portion.

[0027] The operation and effect of the scroll compressor according to this embodiment will be described below. That is, when power is applied to the motor 200, the rotating shaft 300 can rotate together with the rotor 220. Also, the orbiting scroll 400 can orbit by receiving a rotational force from the rotating shaft 300 through the eccentric bush. As a result, the compression chamber can continuously move toward the center and reduce in volume. Also, the refrigerant flows into the compression chamber and is compressed while moving toward the center along the movement path of the compression chamber. Then, the refrigerant compressed in the compression chamber can be discharged to the discharge chamber D through the discharge port 540 opened by the discharge valve 550.

[0028] Here, when the pressures of the third outer compression chamber and the third inner compression chamber reach the discharge pressure level, the main opening / closing unit 552 opens the main discharge port 542, when the pressure of the second outer compression chamber exceeds the second pressure, the first sub opening / closing unit 554 opens the first sub discharge port to reduce the pressure of the second outer compression chamber to the second pressure level, when the pressure of the second inner compression chamber exceeds the second pressure, the second sub opening / closing unit 556 opens the second sub discharge port to reduce the pressure of the second inner compression chamber to the second pressure level, and it is possible to prevent the pressure of the refrigerant discharged from the main discharge port 542 from becoming excessively higher than the discharge pressure. In other words, it is possible to prevent over-compression.

[0029] The refrigerant in the discharge chamber D may move to the oil separation chamber V through the inlet of the oil separation chamber. The refrigerant flowing into the oil separation chamber V performs cyclone motion, and the oil contained in the refrigerant is adsorbed onto the inner wall surface of the oil separation chamber V and separated from the refrigerant. The oil separated from the refrigerant in the oil separation chamber V can move to the oil recovery passage through the oil outlet of the oil separation chamber. In addition, the refrigerant separated from the oil in the oil separation chamber V can be discharged to the outside of the housing 100 through a refrigerant outlet of the oil separation chamber.

[0030] Here, in the scroll compressor according to the present embodiment, the rear housing 130 includes the post 136 that contacts the retainer 560, so that noise and vibration caused by collision between the discharge valve 550 and the retainer 560 can be reduced. Specifically, when post 136 comes into contact with retainer 560, the mass and strength of an object colliding with discharge valve 550 increases, thereby reducing noise and vibration caused by the collision.

[0031] Furthermore, the degree of opening of the discharge valve 550 can be reduced by not simply contacting the post 136 with the retainer 560, but by pressing the retainer 560 toward the discharge valve 550 and deforming it. That is, the degree of opening of the discharge valve 550 in a state in which the retainer 560 is pressed and deformed by the post 136 may be smaller than the degree of opening of the discharge valve 550 in a state in which the retainer 560 is not pressed and deformed by the post 136. This reduces the range of motion of the discharge valve 550 and reduces the impact that the discharge valve 550 gives to the retainer 560, and as a result, noise and vibration due to a collision between the discharge valve 550 and the retainer 560 can be further reduced.

[0032] However, if the opening degree of the discharge valve 550 is excessively reduced, this may adversely affect the flow rate of the refrigerant discharged through the discharge port 540, and therefore the deformation amount of the retainer 560 caused by the post 136 must be appropriately controlled. That is, the protruding length of the post 136 must be controlled so as to be within a predetermined range. For this reason, in the case of this embodiment, the line end face of the rear housing side plate 134, the tolerance of which is controlled for contact with the seal member interposed between the rear housing 130 and the center housing 110, is used as a reference plane, and the axial distance (vertical direction in FIGS. 4 and 6) between the reference plane and the line end face 136b of the post 136 can be controlled so as to be within a predetermined range.

[0033] On the other hand, unlike this embodiment, if the post 136 and the retainer 560 are formed to be in surface contact with each other, the line end surface 136b of the post 136 must be formed to correspond to the curved shape of the retainer 560, which is very difficult and complicated, and increases the cost. However, as in this embodiment, the post 136 is formed so that the line end surface 136b of the post 136 is perpendicular to the extension direction of the post 136, and the post 136 is in line contact with the retainer 560, the cost required for forming the line end surface 136b of the post 136 can be reduced.

[0034] When the post 136 comes into line contact with the retainer 560, the effect of reducing noise and vibration caused by a collision between the discharge valve 550 and the retainer 560 may be weakened, but when the post 136 comes into contact with the opening / closing limiting portion of the retainer 560, particularly the center of the opening / closing limiting portion, as in this embodiment, a sufficient effect of reducing noise and vibration can be obtained even if the contact area between the post 136 and the retainer 560 is small. That is, the portion of the discharge valve 550 that has the largest range of movement is the opening / closing portion, and therefore the portion of the retainer 560 that receives the largest amount of impact is the opening / closing limiting portion, but when the post 136 comes into contact with the opening / closing limiting portion of the retainer 560, noise and vibration can be effectively reduced. In addition, when the post 136 comes into contact with the center of the opening / closing limiting portion, the entire opening / closing limiting portion is supported evenly and stably, and the effect of reducing noise and vibration is greater than when the outer periphery of the opening / closing limiting portion is supported by the post 136.

[0035] Meanwhile, as described above, since the retainer 560 includes the main opening / closing limiting part 562, the first sub opening / closing limiting part 564, and the second sub opening / closing limiting part 566, the post 136 may be formed so as to contact all of the main opening / closing limiting part 562, the first sub opening / closing limiting part 564, and the second sub opening / closing limiting part 566, but in this case, there is a possibility that the cost, weight, and resistance to the flow of the refrigerant will increase. In consideration of this, in the case of this embodiment, the post 136 is formed so as to support the main opening / closing limiting part 562, which is struck the most frequently and receives a relatively large amount of impact among the main opening / closing limiting part 562, the first sub opening / closing limiting part 564, and the second sub opening / closing limiting part 566, thereby suppressing the increase in cost, weight, and resistance to the flow of the refrigerant and effectively reducing noise and vibration. On the other hand, in the embodiment, the post P is formed on the rear housing 130, but the present invention is not limited to this.

[0036] Figure 8 is an oblique view showing a rear housing, fixed scroll, discharge valve, retainer, and injection valve assembly in a scroll compressor according to another embodiment of the present invention, Figure 9 is an oblique view showing an injection flow path in the scroll compressor of Figure 8, Figure 10 is an exploded oblique view of Figure 8, Figure 11 is an oblique view of the rear housing and injection valve assembly of Figure 8 as viewed from the fixed scroll, discharge valve, and retainer side, Figure 12 is an enlarged view of portion D in Figure 8, and Figure 13 is a cross-sectional view along line EE in Figure 12.

[0037] Referring to the accompanying Figures 1 and 8 to 13, a scroll compressor according to another embodiment of the present invention includes a housing 100, a motor 200 that generates power inside the housing 100, a rotating shaft 300 that rotates by the motor 200, a rotating scroll 400 that orbits about the rotating shaft 300, and a fixed scroll 500 that is fixed to the housing 100 and engages with the orbiting scroll 400 to form a compression chamber. The scroll compressor may further include, for example, an injection passage that guides intermediate-pressure refrigerant from downstream of a condenser provided outside the housing 100 to the compression chamber, and an injection valve assembly 800 that opens and closes the injection passage.

[0038] Here, the injection flow passage includes an introduction port 132b, an introduction chamber Ci, an inlet 812, a chamber 832, an outlet 834, and an injection port 570 described later, and extends from the rear housing 130 to the fixed scroll 500, and the injection valve assembly 800 includes an inlet 812, a chamber 832, and an outlet 834 described later, and may be interposed between the rear housing 130 and the fixed scroll 500. The housing 100 may include a center housing 110, a front housing 120 fastened to the center housing 110 and forming a motor accommodating space in which the motor 200 is accommodated, and a rear housing 130 fastened to the center housing 110 on the opposite side of the front housing 120 with respect to the center housing 110 as a reference, and forming a scroll accommodating space in which the orbiting scroll 400 and the fixed scroll 500 are accommodated.

[0039] The center housing 110 can include a main frame 112 that separates the motor accommodating space from the scroll accommodating space and supports the orbiting scroll 400 and the fixed scroll 500, and a center housing side plate 114 that protrudes from the outer periphery of the main frame 112 toward the front housing 120. The main frame 112 is formed in a substantially disk shape, and a bearing hole through which one end of the rotating shaft 300 passes and a back pressure chamber for pressurizing the orbiting scroll 400 toward the fixed scroll 500 may be formed in the center of the main frame 112. Here, an eccentric bushing that converts the rotational motion of the rotating shaft 300 into the orbital motion of the orbiting scroll 400 is formed in one end of the rotating shaft 300, and the back pressure chamber may provide a space in which the eccentric bushing can rotate. Furthermore, a suction passage may be formed on the outer periphery of the main frame 112 to guide the refrigerant flowing into the motor accommodating space to the scroll accommodating space, as described later.

[0040] The front housing 120 can include a front housing hard plate 122 that faces the main frame 112 and supports the other end of the rotating shaft 300, and a front housing side plate 124 that protrudes from the outer periphery of the front housing hard plate 122, is fastened to the center housing side plate 114, and supports the motor 200. The front side plate 124 may be formed with a suction port for guiding refrigerant at suction pressure from the outside into the motor housing space. The rear housing 130 may include a rear housing hard plate 132 facing the main frame 112 , and a rear housing side plate 134 protruding from the outer periphery of the rear housing hard plate 132 and fastened to the outer periphery of the main frame 112 .

[0041] In addition, the rear housing 130 may further include a discharge chamber Cd that accommodates the refrigerant discharged from the compression chamber, a discharge port 132a that guides the refrigerant in the discharge chamber Cd to the outside of the housing, an inlet port 132b through which intermediate pressure refrigerant is introduced from the outside of the housing 100, and an inlet chamber Ci that accommodates the refrigerant introduced through the inlet port 132b. Here, the rear housing 130 can include a first annular wall 136 protruding from the rear housing hard plate 132 and positioned radially inward of the rear housing side plate 134, and a second annular wall 138 protruding from the rear housing hard plate 132 and positioned radially inward of the first annular wall 136.

[0042] The rear housing side plate 134 may be formed in an annular shape having a diameter substantially equal to the outer periphery of the main frame 112 and fastened to the outer periphery of the main frame 112 to form a scroll accommodating space. The first annular wall 136 is formed in an annular shape having a diameter smaller than that of the rear housing side plate 134, and may be in contact with an outer periphery of a fixed scroll hard plate 510 (described later) to form a discharge chamber Cd. The second annular wall (138) is formed in an annular shape having a diameter smaller than that of the first annular wall 136, is spaced apart from the fixed scroll hard plate 510 described below, and is covered by the valve plate 810 described below, so as to form an introduction chamber Ci.

[0043] A discharge port 132a is formed in the rear housing hard plate 132, and the discharge port 132a extends in the radial direction of the rear housing hard plate 132 from the center of the rear housing hard plate 132 to one side of the outer periphery of the rear housing hard plate 132 and can communicate with the discharge chamber Cd. In addition, an introduction port 132b is also formed in the rear housing hard plate 132, and the introduction port 132b extends in the radial direction of the rear housing hard plate 132 from the other side of the outer periphery of the rear housing hard plate 132 to the center of the rear housing hard plate 132 and can be connected to the introduction chamber Ci.

[0044] The motor 200 may include a stator 210 that is fixed to the front housing side plate 124 , and a rotor 220 that rotates within the stator 210 through interaction with the stator 210 . The rotating shaft 300 may be fastened to the rotor 220, pass through the center of the rotor 220, one end of the rotating shaft 300 may pass through a bearing hole of the main frame 112, and the other end of the rotating shaft 300 may be supported by the front housing hard plate 122. The orbiting scroll 400 is interposed between the main frame 112 and the fixed scroll 500, and can include a disk-shaped orbiting scroll hard plate 410, an orbiting scroll wrap 420 protruding from the center of the orbiting scroll hard plate 410 toward the fixed scroll 500, and an orbiting scroll boss 430 protruding from the center of the orbiting scroll hard plate 410 to the opposite side of the orbiting scroll wrap 420 and fastened to an eccentric bush.

[0045] The fixed scroll 500 can include a disk-shaped fixed scroll hard plate 510, a fixed scroll wrap 520 that protrudes from the center of the fixed scroll hard plate 510 and meshes with the orbiting scroll wrap 420, and a fixed scroll side plate 530 that protrudes from the outer periphery of the fixed scroll hard plate 510 and is fastened to the main frame 112 to form a rotation space for the orbiting scroll 400. Here, the fixed scroll hard plate 510 includes a discharge port 540 that discharges the refrigerant in the compression chamber to the discharge chamber Cd, and a discharge valve 550 that is interposed between the fixed scroll hard plate 510 and the injection valve assembly 800 and opens and closes the discharge port 540, and a retainer 560 that limits the opening degree of the discharge valve 550 may be fixed to the fixed scroll hard plate 510 by fastening bolts.

[0046] In addition, in order to prevent the refrigerant from being excessively compressed, a plurality of discharge ports 540 may be formed, and the discharge valve 550 and the retainer 560 may be formed to correspond to the plurality of discharge ports 540 . Specifically, the compression chamber includes a first compression chamber located on the radial centrifugal side of the scroll accommodating space, in which the refrigerant pressure is a first pressure, a second compression chamber located on the radial centrifugal side of the scroll accommodating space from the first compression chamber, in which the refrigerant pressure is a second pressure higher than the first pressure, and a third compression chamber located on the radial centrifugal side of the scroll accommodating space from the second compression chamber, in which the refrigerant pressure is a third pressure higher than the second pressure, and the first compression chamber, the second compression chamber, and the third compression chamber may each be provided in pairs. That is, the first compression chamber can include a first outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a first inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520.

[0047] In addition, the second compression chamber can include a second outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a second inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520. The third compression chamber can include a third outer compression chamber formed by the outer peripheral surface of the orbiting scroll wrap 420 and the inner peripheral surface of the fixed scroll wrap 520, and a third inner compression chamber formed by the inner peripheral surface of the orbiting scroll wrap 420 and the outer peripheral surface of the fixed scroll wrap 520.

[0048] In this case, the discharge port 540 may include a main discharge port 542 formed on the center side of the fixed scroll hard plate 510 to discharge the refrigerant from the third outer compression chamber and the third inner compression chamber, a first sub-discharge port 542 formed radially outward of the fixed scroll hard plate 510 based on the main discharge port 542 to discharge the refrigerant from the second outer compression chamber, and a second sub-discharge port formed radially outward of the fixed scroll hard plate 510 based on the main discharge port 542 but on the opposite side of the first sub-discharge port based on the main discharge port 542 to discharge the refrigerant from the second inner compression chamber.

[0049] The discharge valve 550 may include a fastening portion 551 fastened to the fixed scroll hard plate 510, a main opening / closing portion 552 for opening and closing the main discharge port 542, a first sub-opening / closing portion 554 for opening and closing the first sub-discharge port, a second sub-opening / closing portion 556 for opening and closing the second sub-discharge port, a main lead portion 553 extending from the fastening portion 551 to the main opening / closing portion 552, a first sub-lead portion extending from the fastening portion 551 to the first sub-opening / closing portion 554, and a second sub-lead portion extending from the fastening portion 551 to the second sub-opening / closing portion 556.

[0050] The retainer 560 includes a fixed portion 561 that is fastened to the fixed scroll hard plate 510 together with the fastening portion 551 of the discharge valve 550, a main opening / closing limiting portion 562 that faces the main opening / closing portion 552 of the discharge valve 550 and limits the opening degree of the main opening / closing portion 552, a first sub opening / closing limiting portion 564 that faces the first sub opening / closing portion 554 of the discharge valve 550 and limits the opening degree of the first sub opening / closing portion 554, and a second sub opening / closing limiting portion 565 that faces the second sub opening / closing portion 556 of the discharge valve 550. It may include a second sub opening / closing limiting portion 566 that limits the opening degree of the second sub opening / closing portion 556, a main lead limiting portion 563 extending from the fixed portion 561 to the main opening / closing limiting portion 562 and facing the main lead portion 553, a first sub-lead limiting portion extending from the fixed portion 561 to the first sub opening / closing limiting portion 564 and facing the first sub-lead portion, and a second sub-lead limiting portion extending from the fixed portion 561 to the second sub opening / closing limiting portion 566 and facing the second sub-lead portion.

[0051] Meanwhile, the fixed scroll hard plate 510 may further include an inlet 570 for guiding the refrigerant discharged from the injection valve assembly 800 to the compression chambers, and the inlet 570 may be formed to supply the refrigerant discharged from the injection valve assembly 800 to both of the pair of first compression chambers. That is, the inlet 570 may include a first inlet capable of communicating with the first outer compression chamber and a second inlet capable of communicating with the first inner compression chamber. The injection valve assembly 800 may include a valve plate 810 covering the introduction chamber Ci and having an inlet 812 communicating with the introduction chamber Ci, an injection valve 820 for opening and closing the inlet 812 of the valve plate 810, a chamber 832 for temporarily storing the refrigerant that has passed through the injection valve 820, and a cover plate 830 having an outlet 834 that guides the refrigerant to the injection port 570.

[0052] Here, the cover plate 830 may include a cover plate lower surface 836 that faces the fixed scroll 500 . The cover plate underside 836 may be formed to be separated from the fixed scroll hard plate 510 so that the discharge valve 550 and the retainer 560 are interposed between the fixed scroll hard plate 510 and the underside of the valve plate 810, and so that the refrigerant discharged from the discharge port 540 can flow into the discharge chamber Cd. In addition, the cover plate 830 may further include a rib 838 that protrudes from a lower surface 836 of the cover plate toward the fixed scroll 500 and traverses the cover plate 830 in the diametrical direction in order to reinforce the strength of the cover plate 830 .

[0053] Additionally, the cover plate 830 may further include a post P that contacts the retainer 560 . Here, in order to reduce the protruding length of the post P, reduce the obstruction of the refrigerant flow caused by the post P, and improve the supporting force for the retainer 560, it is preferable that the post P protrudes from the cover plate 830 facing the retainer 560 in the axial direction (the up-down direction in Figure 8) as in this embodiment. In addition, it is preferable that the post P protrudes in a virtual axial direction from a portion of the cover plate 830 that intersects with a virtual axis that crosses the main outlet 542, the main opening / closing portion 552, and the main opening / closing limiting portion 562 so as to contact the main opening / closing limiting portion 562 of the retainer 560.

[0054] Furthermore, in order to further shorten the protruding length of the post P and further improve the strength of the cover plate 830, it is even more preferable that a portion of the rib 838 is formed to intersect with a virtual axis, and the post P protrudes in the virtual axial direction from the portion of the rib 838 that intersects with the virtual axis. Further, in terms of improving strength, it is more preferable that a plurality of ribs 838 are formed so as to intersect with one another, and that the post P protrudes from the portion where the plurality of ribs 838 intersect with one another. Moreover, the post P is preferably formed so as to come into contact with the center portion of the main opening / closing limiting portion 562. In addition, it is preferable that the post P is formed so that the line end surface P2 of the post P is perpendicular to the imaginary axis, and the corner between the line end surface P2 of the post P and the outer peripheral surface P1 is formed so as to be in line contact with the retainer 560. It is preferable that the post P is formed not only so as to simply come into contact with the retainer 560, but also so as to deform the retainer 560 when it is pressed toward the discharge valve 550.

[0055] The operation and effect of the scroll compressor according to this embodiment will be described below. That is, when power is applied to the motor 200, the rotating shaft 300 can rotate together with the rotor 220. In addition, the rotating scroll 400 can rotate by transmitting a rotational force from the rotating shaft 300 through the eccentric bush. As a result, the compression chamber can reduce its volume while continuously moving toward the center. In addition, the refrigerant at the suction pressure flows into the compression chamber through the suction port, the motor housing space, the suction flow passage, and the scroll housing space. In addition, the refrigerant sucked into the compression chamber is compressed while moving toward the center along the movement path of the compression chamber. Then, the refrigerant compressed in the compression chamber is discharged into the discharge chamber Cd through the discharge port 540 opened by the discharge valve 550.

[0056] Here, as shown by the dotted arrow in Fig. 9, by injecting intermediate pressure refrigerant into the compression chamber through the injection passage, it is possible to compress and discharge not only suction pressure refrigerant but also intermediate pressure refrigerant. This increases the amount of refrigerant discharged compared to when only suction pressure refrigerant is sucked in, compressed, and discharged, thereby improving the performance and efficiency of the scroll compressor. In addition, when the pressures of the third outer compression chamber and the third inner compression chamber reach the discharge pressure level, the main opening / closing unit 552 opens the main discharge port 542, and when the pressure of the second outer compression chamber exceeds the second pressure, the first sub opening / closing unit 554 opens the first sub discharge port to lower the pressure of the second outer compression chamber to the second pressure level, and when the pressure of the second inner compression chamber exceeds the second pressure, the second sub opening / closing unit 556 opens the second sub discharge port to lower the pressure of the second inner compression chamber to the second pressure level, thereby preventing the pressure of the refrigerant discharged from the main discharge port 542 from becoming excessively higher than the discharge pressure. In other words, over-compression can be prevented.

[0057] In addition, the refrigerant in the discharge chamber Cd may be discharged to the outside of the housing 100 through the discharge port 132a. Here, in the scroll compressor according to this embodiment, the injection valve assembly 800 includes a post P that contacts the retainer 560, thereby reducing noise and vibration caused by collision between the discharge valve 550 and the retainer 560; however, a detailed description of this will be omitted as it overlaps with the above-mentioned embodiment. [Explanation of symbols]

[0058] 100 Housing 110 Center Housing 112 Mainframe 114 Center housing side plate 120 Front housing 122 Front housing hard plate 124 Front housing side plate 130 Rear housing 132 Rear housing hard plate 132a Discharge port 132b Introduction port 134 Rear housing side plate 136 Post, First Circular Wall 136a Outer surface 136b wire end face 138 Second Circular Wall 143 Rear housing side plate 200 Motor 210 Stator 220 Rotor 300 Rotational Axis 400 Swivel Scroll 410 Rotating Scroll Hard Plate 420 Swivel Scroll Wrap 430 Rotating Scroll Boss 500 Fixed Scroll 510 Fixed scroll hard plate 520 Fixed Scroll Wrap 530 Fixed scroll side plate 540 Discharge port 542 Main outlet, 1st sub outlet 550 Discharge Valve 551 Fastening part 552 Main opening and closing part 553 Main lead part 554 First sub opening and closing section 555 1st sublead part 556 Second sub opening and closing section 560 Retainer 561 Fixed part 562 Main opening and closing limiter 563 Main Lead Restriction Section 564 1st sub opening / closing limiter 565 First Sublead Restriction Section 566 Second sub opening / closing limiter 567 Sub-Lead Restriction Section 570 Inlet 800 Open injection valve assembly 810 Valve Plate 812 Inlet 820 Injection valve 830 Cover Plate 832 Chamber 834 Outlet 836 Cover plate underside 838 Rib Ci Introduction Room CD discharge chamber D Discharge chamber P Post P1 outer surface P2 wire end face V Oil Separation Chamber

Claims

1. Housing and A motor provided inside the housing; A rotating shaft rotated by the motor; A rotating scroll that rotates about the rotation shaft; a fixed scroll forming a compression chamber together with the orbiting scroll; a discharge valve that opens and closes a discharge port formed in the fixed scroll to discharge the refrigerant from the compression chamber; a retainer that limits the opening degree of the discharge valve; and a post in contact with the retainer.

2. the housing includes a rear housing having a discharge chamber that accommodates the refrigerant discharged from the discharge port, 2. The scroll compressor according to claim 1, wherein the rear housing includes the post.

3. an injection passage for introducing an intermediate pressure refrigerant into the compression chamber; and an injection valve assembly for opening and closing the injection passage.

2. The scroll compressor of claim 1, wherein said injection valve assembly includes said post.

4. 2. The scroll compressor according to claim 1, wherein the retainer is deformed toward the discharge valve by the post.

5. 5. The scroll compressor according to claim 4, wherein an opening degree of the discharge valve when the retainer is in contact with the post is smaller than an opening degree of the discharge valve when the retainer is not in contact with the post.

6. The discharge valve includes an opening / closing portion facing the discharge port, the retainer includes an opening / closing limiting portion opposed to the opening / closing portion, The scroll compressor according to claim 1 , wherein the post contacts the opening / closing limiting portion.

7. 7. The scroll compressor according to claim 6, wherein the post contacts a center portion of the open / close limiting portion.

8. the housing includes a rear housing having a discharge chamber that accommodates the refrigerant discharged from the discharge port, 7. The scroll compressor according to claim 6, wherein the post extends in the imaginary axial direction from a portion of the rear housing intersecting with an imaginary axis that crosses the discharge port, the opening / closing portion, and the opening / closing limiting portion.

9. The rear housing includes an oil separation chamber that separates oil from a refrigerant, 9. The scroll compressor according to claim 8, wherein said post extends from a wall portion defining said oil separation chamber.

10. The housing includes an inlet chamber that contains an intermediate pressure refrigerant, a valve plate having an inlet communicating with the introduction chamber and covering the introduction chamber, an injection valve for opening and closing the inlet of the valve plate, and a cover plate having an outlet for guiding the refrigerant that has passed through the injection valve to the compression chamber side, 7. The scroll compressor according to claim 6, wherein the post protrudes in the imaginary axial direction from a portion of the cover plate intersecting with an imaginary axis that crosses the discharge port, the opening / closing portion, and the opening / closing limiting portion.

11. The cover plate further includes a rib protruding toward the fixed scroll and extending across the cover plate, 11. The scroll compressor according to claim 10, wherein the post protrudes from the rib toward the retainer.

12. The scroll compressor according to claim 11, wherein the rib is formed in a plurality of parts, the plurality of ribs are formed to intersect with each other, and the post protrudes from a portion where the plurality of ribs intersect with each other.

13. The scroll compressor according to claim 6, wherein the post is formed so as to be in line contact with the open / close limiting portion.

14. The scroll compressor according to claim 13, wherein a linear end surface of the post is formed to be perpendicular to an imaginary axis that crosses the discharge port, the opening / closing portion, and the opening / closing limiting portion.

15. The discharge port includes a main discharge port formed on a center side of the fixed scroll and a sub-discharge port formed on a radially outer side of the fixed scroll with respect to the main discharge port, the discharge valve includes a main opening / closing unit that opens and closes the main discharge port and a sub opening / closing unit that opens and closes the sub discharge port, the retainer includes a main opening / closing limiting portion that limits an opening degree of the main opening / closing portion, and a sub opening / closing limiting portion that limits an opening degree of the sub opening / closing portion, The scroll compressor according to claim 1 , wherein the post is formed so as to come into contact with the main opening / closing limiting portion.

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