Scroll compressor

Abstract

A scroll compressor includes a stationary fixed scroll and a movable orbiting scroll. The fixed scroll body and the orbiting scroll body respectively extend along an involute line and engage with each other to define a plurality of working chambers, the working chambers including a first working chamber near an inner end of the orbiting scroll body and defined between an outer sidewall of the orbiting scroll body and an inner sidewall of the fixed scroll body, and a second working chamber near the inner end of the fixed scroll body and defined between the outer sidewall of the fixed scroll body and the inner sidewall of the orbiting scroll body. The fixed scroll and / or the orbiting scroll is provided with an auxiliary groove configured to connect the second working chamber to the central outlet when the first working chamber is connected to the central outlet.

Description

BACKGROUND

[0001] The present disclosure relates to the field of compressor technology, and more particularly, to a scroll compressor.

[0002] Scroll compressors are widely used in air conditioning due to their numerous advantages, including high volumetric efficiency, minimal vibration, and low noise. The improvements of existing scroll compressors have focused primarily on increasing the suction and increasing the volumetric efficiency. Existing scroll compressors typically use a combination of an orbiting scroll and a fixed scroll to compress the medium. A plurality of working chambers for containing and compressing the medium are defined between the scroll bodies of the fixed and orbiting scrolls. These working chambers are arranged symmetrically about the center of the scroll bodies. However, since the exhaust outlet is often located in the fixed scroll, it does not move with the movement of the orbiting scroll. This results in a pressure imbalance between the pair of working chambers near the center of the scroll bodies, which causes radial movement of the orbiting scroll. This radial movement not only increases the noise and wear of the orbiting scroll during operation, but also causes a tangential gap between the orbiting and fixed scrolls. This tangential gap provides a path for the medium to leak from the high-pressure working chamber to the low-pressure working chamber, thereby reducing the volumetric efficiency of the scroll compressor.

[0003] Thus, in the art, there is a great need for a technical solution that can improve the pressure balance between pairs of working chambers in scroll compressors.SUMMARY

[0004] In order to address the problems in the prior art described above, the present disclosure provides an improved scroll compressor, comprising: a stationary fixed scroll, the fixed scroll comprising a fixed disk body having a central outlet and a fixed scroll body protruding from a surface of the fixed disk body; and a movable orbiting scroll, the orbiting scroll comprising an orbiting disk body and an orbiting scroll body projecting from a surface of the orbiting disk body, wherein the fixed scroll body and the orbiting scroll body respectively extend along an involute line and engage with each other to define a plurality of working chambers, the plurality of working chambers comprising a first working chamber near an inner end of the orbiting scroll body and defined between an outer sidewall of the orbiting scroll body and an inner sidewall of the fixed scroll body and a second working chamber near the inner end of the fixed scroll body and defined between the outer sidewall of the fixed scroll body and the inner sidewall of the orbiting scroll body, and wherein the fixed scroll and / or the orbiting scroll is provided with an auxiliary groove configured to connect the second working chamber to the central outlet when the first working chamber is connected to the central outlet.

[0005] According to one optional embodiment of the present disclosure, an inner end of the fixed scroll body is configured to be in contact with an inner sidewall of the orbiting scroll body when the first working chamber is connected to the central outlet, and the auxiliary groove is configured to extend across an inner end of the fixed scroll body when the first working chamber is connected to the central outlet.

[0006] According to one optional embodiment of the present disclosure, the auxiliary groove is formed in the fixed disk body and recessed from a surface of the fixed disk body, and the auxiliary groove leads to the central outlet at a proximal end and extends across an inner end of the fixed scroll body from the proximal end to a distal end.

[0007] According to one optional embodiment of the present disclosure, the distal end of the auxiliary groove and the central outlet are located on two sides of an inner end of the fixed scroll body.

[0008] According to one optional embodiment of the present disclosure, the auxiliary groove extends between the proximal end and the distal end about an inner end of the fixed scroll body so that the auxiliary groove has a shape that curves towards an inner end of the fixed scroll body.

[0009] According to one optional embodiment of the present disclosure, a sidewall of the auxiliary groove is tangent to a sidewall of the central outlet at the proximal end.

[0010] According to one optional embodiment of the present disclosure, the auxiliary groove narrows along a direction from the proximal end to the distal end.

[0011] According to one optional embodiment of the present disclosure, the orbiting scroll is adapted to be moved to a position where an outer sidewall of the orbiting scroll body is tangent to a sidewall of the central outlet and an inner sidewall of the orbiting scroll body is tangent to a sidewall of the auxiliary groove.

[0012] According to one optional embodiment of the present disclosure, the auxiliary groove extends from a surface of the fixed disk body to a portion of the thickness of the fixed disk body.

[0013] According to one optional embodiment of the present disclosure, the auxiliary groove extends through the fixed disk body.

[0014] According to one optional embodiment of the present disclosure, the auxiliary groove is formed in the orbiting scroll body and recessed from a top of the orbiting scroll body, and the auxiliary groove extends from a proximal end located on an inner end of the orbiting scroll body to a distal end located on an inner sidewall of the orbiting scroll body.

[0015] According to one optional embodiment of the present disclosure, the orbiting scroll is adapted to be moved to a position where an inner end of the fixed scroll body is tangent to an inner sidewall of the orbiting scroll body at a distal end of the auxiliary groove and an outer sidewall of the orbiting scroll body is tangent to a sidewall of the central outlet.

[0016] According to one optional embodiment of the present disclosure, the auxiliary groove extends from a top of the orbiting scroll body to a portion of the height of the orbiting scroll body.

[0017] According to one optional embodiment of the present disclosure, the auxiliary groove extends from a top of the orbiting scroll body to a surface of the orbiting disk body.

[0018] The present disclosure may be embodied as a schematic example in the accompanying drawings. However, it should be noted that the accompanying drawings are merely schematic and that any change contemplated under the teachings of the present disclosure shall be considered to be included within the scope of the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings illustrate exemplary examples of the present disclosure. These accompanying drawings should not be construed as necessarily limiting the scope of the present disclosure, wherein:

[0020] FIG. 1 is a schematic cross-sectional view of a scroll compressor according to one embodiment of the present disclosure;

[0021] FIG. 2 is a schematic perspective view of a fixed scroll of the scroll compressor shown in FIG. 1;

[0022] FIG. 3 is a schematic perspective view of an orbiting scroll of the scroll compressor shown in FIG. 1;

[0023] FIGS. 4a, 4b, 4c and 4d, are schematic cross-sectional views of a fixed scroll body and an orbiting scroll body in different positions taken along line IV-IV in FIG. 1, wherein the outlines of the fixed scroll body and the orbiting scroll body are shown as dashed lines for clarity;

[0024] FIG. 5 is a schematic perspective view of a fixed scroll of a scroll compressor according to another embodiment of the present disclosure; and

[0025] FIG. 6 is a schematic perspective view of an orbiting scroll of a scroll compressor according to yet another embodiment of the present disclosure.DETAILED DESCRIPTION

[0026] Further features and advantages of the present disclosure will become more apparent from the following description, which is made with reference to the accompanying drawings. Exemplary examples of the present disclosure are shown in the accompanying drawings, and the various accompanying drawings are not necessarily drawn in actual proportions. However, the present disclosure may be implemented in many different forms and should not be construed as necessarily limiting to the exemplary examples disclosed herein. Rather, these exemplary examples are merely provided for illustrative purposes of the present disclosure and for delivering the spirit and substance of the present disclosure to those skilled in the art.

[0027] It is the aim of the present disclosure to propose a scroll compressor with a novel design. Through the novel design of this scroll compressor, the pressure balance between the various working chambers defined by the orbiting scroll and the fixed scroll during operation can be significantly improved, thereby significantly reducing the radial rocking of the orbiting scroll during its revolution, and thus reducing the overturning of the orbiting scroll body caused by the radial rocking of the orbiting scroll and the tangential leakage between the orbiting scroll body and the fixed scroll body. It can also mitigate the wear and noise of the orbiting scroll body and the fixed scroll body caused by the radial rocking of the orbiting scroll. The scroll compressor according to the present disclosure is therefore effective at avoiding tangential leakage, thereby maintaining higher volumetric efficiency and mitigating the wear of the fixed scroll body and the orbiting scroll body. This provides longer service life and higher reliability as well as reducing noise generated during operation, thereby maintaining a better operating environment.

[0028] A plurality of optional but non-limiting embodiments of a scroll compressor according to the present disclosure are described in detail below with reference to the various figures. Before proceeding, it is to be noted that among the terms used in the present disclosure, the terms “axial direction,”“radial direction,”“circumferential direction,” and the like have their common meanings in the art. Specifically, the axial direction can be a direction parallel to or coincident with the rotation axis of the main shaft of the scroll compressor, that is, the axial direction can be defined by the rotation axis of the main shaft; the radial direction can be any direction perpendicular to the axial direction; and the circumferential direction can be any direction surrounding the axial direction.

[0029] Referring to FIG. 1, there is shown a schematic cross-sectional view of a scroll compressor according to one embodiment of the present disclosure. As shown in FIG. 1, the scroll compressor 10 generally includes a housing 100 and a fixed scroll 200, an orbiting scroll 300, a motor 400, and a transmission assembly 500 housed in the housing 100. The fixed scroll 200 is fixedly disposed in the housing 100 and includes a fixed disk body 210 and a fixed scroll body 220 protruding from the fixed disk body 210 along the axial direction XX', wherein the fixed scroll body 220 extends from the center of the fixed disk body 210 toward the periphery of the fixed disk body 210 along an involute or in the form of an involute. The orbiting scroll 300 is movably disposed in the housing 100 and includes an orbiting disk body 310 and an orbiting scroll body 320 protruding from the orbiting disk body 310 along the axial direction XX', wherein the orbiting scroll body 320 extends from the center of the orbiting disk body 310 toward the periphery of the orbiting disk body 310 along an involute or in the form of an involute. The fixed scroll body 220 of the fixed scroll 200 and the orbiting scroll body 320 of the orbiting scroll 300 are arranged towards each other such that the fixed scroll body 220 is oriented to protrude from the fixed disk body 210 towards the orbiting disk body 310, while the orbiting scroll body 320 is oriented to protrude from the orbiting disk body 310 towards the fixed disk body 210. Additionally, as described in further detail below, a sidewall of the fixed scroll body 220 may be engaged with or tangent to a sidewall of the orbiting scroll body 320 at a plurality of positions, thereby defining a plurality of working chambers distributed along an involute line therebetween.

[0030] As shown in FIG. 1, the motor 400 comprises a stator 410 fixedly disposed in the housing 100, a rotor 420 rotatably disposed in the housing 100, and a spindle 430 non-rotatably connected to the rotor 420 (e.g., by welding, bolts, keyways, etc.) to support the rotor 420 in the housing 100, wherein when the rotor 420 rotates around the axial direction XX’ under the drive of the rotating magnetic field generated after the stator 410 is energized, the spindle 430 can rotate together with the rotor 420 around the axial direction XX’. The transmission assembly 500 comprises an eccentric block 510 and an eccentric shaft 520 that connects the eccentric block 510 to the spindle 430, wherein the eccentric block 510 is connected to the orbiting scroll 300, e.g., by a bearing 610, the orbiting scroll 300 may be provided with a bearing seat 330 on the side of the orbiting disk body 310 opposite to the orbiting scroll body 320, and the bearing 610 may be received in the bearing seat 330 and the eccentric block 510 may be inserted into the bearing 610. Additionally, the eccentric axis 520 may be inserted into the spindle 430 in a fixed and eccentric manner relative to the spindle 430 and into the eccentric block 510 in a rotatable and eccentric manner relative to the eccentric block 510, such that the eccentric block 510 is rotatably connected to the spindle 430 at an eccentric position relative to the spindle 430. In this configuration, the rotation of the spindle 430 about the axial direction XX' may be converted into the revolution of the eccentric block 510 about the axial direction XX' (which may also be referred to as translation), while the revolution of the eccentric block 510 about the axial direction XX' may in turn be converted into the revolution of the orbiting scroll 300 about the axial direction XX'. Of course, in order to inhibit the rotation tendency (also known as the self-rotation tendency) of the orbiting scroll 300, the scroll compressor 10 may also include an anti-rotation structure acting on the orbiting scroll 300 in order to ensure that the orbiting scroll 300 revolves or translates about the axial direction XX' without rotating.

[0031] During the operation of the scroll compressor 10, the stator 410 of the motor 400 may generate a rotating magnetic field after being energized to drive the rotation of the rotor 420 and the spindle 430. The spindle 430 in turn may drive the orbiting scroll 300 to revolve through the eccentric axis 520, the eccentric block 510, and the bearing 610. As the orbiting scroll 300 revolves, each of the plurality of working chambers defined between a sidewall of the fixed scroll body 220 and a sidewall of the orbiting scroll body 320 will move along the involute line from the periphery of the fixed scroll body 220 and the orbiting scroll body 320 toward their center. The volume of each working chamber will gradually decrease as it moves, compressing the medium contained therein. In addition, when moving to the center of the fixed scroll body 220 and the orbiting scroll body 320, the working chambers will connect to the central outlet 230 disposed in the fixed disk body 210 to discharge the compressed medium through the central outlet 230. Thus, during the operation of the scroll compressor 10, the medium (e.g., air, nitrogen, or a refrigerant such as R22 or HFC) may enter working chambers from the periphery of the fixed scroll body 220 and the orbiting scroll body 320 and then be moved and compressed by the working chambers towards the center of the fixed scroll body 220 and the orbiting scroll body 320 before finally being discharged through the central outlet 230. As a result, the medium may be continuously moved, compressed, and discharged in the manner described above as a result of the continuous revolution of the orbiting scroll 300.

[0032] The structure of the fixed scroll and the orbiting scroll is described in greater detail below with reference to FIGS. 2 and 3, wherein FIG. 2 shows a schematic perspective view of a fixed scroll of the scroll compressor shown in FIG. 1 and FIG. 3 shows a schematic perspective view of an orbiting scroll of the scroll compressor shown in FIG. 1. As shown in FIGS. 1 and 2, the fixed disk body 210 has a proximal surface 211 facing the orbiting scroll 300 and a distal surface 212 opposite the proximal surface 211 (i.e., spaced apart from the proximal surface 211 along the axial direction XX'), wherein a central outlet 230 extends from the proximal surface 211 to the distal surface 212 so that the compressed medium can be discharged from a side proximate the orbiting scroll 300 through the central outlet 230 to a side away from the orbiting scroll 300. The fixed scroll body 220 protrudes from the proximal surface 211 of the fixed disk body 210 along the axial direction XX’ and terminates at its top 221, such that the top 221 of the fixed scroll body 220 is spaced apart from the proximal surface 211 of the fixed disk body 210 along the axial direction XX’. When viewed along the axial direction XX', the fixed scroll body 220 extends along an involute line from the inner end 222 of the base circle near the involute line to the outer end 223 of the base circle away from the involute line, and the fixed scroll body 220 further has an inner sidewall 224 and an outer sidewall 225 located between its top 221 and the proximal surface 211 of the fixed disk body 210, wherein the inner sidewall 224 and the outer sidewall 225 are located on two sides of the top 221 and also extend along an involute line from the inner end 222 to the outer end 223. In other words, the inner sidewall 224 is connected to the outer sidewall 225 through the inner end 222 and the outer end 223, and the base circle radius of the involute line followed by the inner sidewall 224 is smaller than the base circle radius of the involute line followed by the outer sidewall 225, so that the inner sidewall 224 is inside the outer sidewall 225. In other words, the inner sidewall 224 is surrounded by the outer sidewall 225. In addition, the central outlet 230 is positioned on the inside of the inner sidewall 224 at a location proximate the inner end 222. In particular, the central outlet 230 is positioned within the base circle of the involute line followed by the inner sidewall 224.

[0033] As shown in FIGS. 1 and 3, similar to the fixed scroll 200, the orbiting disk body 310 has a proximal surface 311 facing the fixed scroll 200 and a distal surface 312 opposite the proximal surface 311 (i.e., spaced apart from the proximal surface 311 along the axial direction XX’), wherein the bearing seat 330 is disposed on the distal surface 312. The orbiting scroll body 320 protrudes from the proximal surface 311 of the orbiting disk body 310 along the axial direction XX’ and terminates at its top 321, such that the top 321 of the orbiting scroll body 320 is spaced apart from the proximal surface 311 of the orbiting disk body 310 along the axial direction XX’. When viewed along the axial direction XX', the orbiting scroll body 320 extends along an involute line from the inner end 322 of the base circle near the involute line to the outer end 323 of the base circle away from the involute line, and the orbiting scroll body 320 further has an inner sidewall 324 and an outer sidewall 225 located between its top 321 and the proximal surface 311 of the orbiting disk body 310, wherein the inner sidewall 324 and the outer sidewall 325 are located on two sides of the top 321 and also extend along an involute line from the inner end 322 to the outer end 323. In other words, the inner sidewall 324 is connected to the outer sidewall 325 through the inner end 322 and the outer end 323, and the base circle radius of the involute line followed by the inner sidewall 324 is smaller than the base circle radius of the involute line followed by the outer sidewall 325, so that the inner sidewall 324 is inside the outer sidewall 325. In other words, the inner sidewall 324 is surrounded by the outer sidewall 325.

[0034] The compression process of the medium is described below with reference to the cross-sectional views of the fixed scroll body 220 and the orbiting scroll body 320 engaged with each other, in conjunction with the description of the fixed scroll and the orbiting scroll above. Referring to FIGS. 4a-4d, they show schematic cross-sectional views of a fixed scroll body and an orbiting scroll body in different positions taken along line IV-IV in FIG. 1, wherein the outlines of the fixed scroll body and the orbiting scroll body are shown as dashed lines for clarity. As shown in FIGS. 4a-4d, the fixed scroll body 220 and the orbiting scroll body 320 define a plurality of pairs of working chambers arranged from the outside to the inside in the direction of the involute lines between each other, wherein each pair of working chambers comprises two working chambers arranged symmetrically about the center of the two scroll bodies (in other words, about the center of the involute base circle). Specifically, in the embodiment shown in FIGS. 4a-4d, three pairs of working chambers a1 and a2, b1 and b2, and c1 and c2 are defined, comprising a pair of working chambers a1 and a2 located on the periphery, a pair of working chambers b1 and b2 located in the middle, and a pair of working chambers c1 and c2 located in the center, and wherein working chambers a1 and b1 are defined between the inner sidewall 224 of the fixed scroll body 220 and the outer sidewall 325 of the orbiting scroll body 320, while working chambers a2 and b2 are defined between the outer sidewall 225 of the fixed scroll body 220 and the inner sidewall 324 of the orbiting scroll body 320. When the orbiting scroll body 320 is in the first position shown in FIG. 4a, the working chambers a1 and a2 are open to allow the medium to be compressed to enter the working chambers a1 and a2, while the working chambers b1 and b2 and the working chambers c1 and c2 that already contain the medium are closed. When the orbiting scroll body 320 moves from the first position shown in FIG. 4a to the second position shown in FIG. 4b through revolution, the working chambers a1 and a2 move toward the center of the two scroll bodies and close, the working chambers b1 and b2 move toward the center of the two scroll bodies and their volume decreases, and the working chambers c1 and c2 reach the center of the two scroll bodies and their volume decreases. This causes the medium in the working chambers a1, a2, b1, and b2 to move toward the center of the two scroll bodies and be compressed, and the medium in the working chambers c1 and c2 can be discharged through the central outlet 230. When the orbiting scroll body 320 further moves from the second position shown in FIG. 4b to the third position shown in FIG. 4c through revolution, the working chambers a1, a2, b1, and b2 further move toward the center of the two scroll bodies and their volume further decreases and the working chambers c1 and c2 are still located at the center of the two scroll bodies and their volume further decreases. This causes the medium in the working chambers a1, a2, b1, and b2 to further move toward the center of the two scroll bodies and be further compressed, and the medium in the working chambers c1 and c2 can be further discharged through the central outlet 230. When the orbiting scroll body 320 further moves from the third position shown in FIG. 4c to the fourth position shown in FIG. 4d through revolution, the working chambers a1, a2, b1, and b2 further move toward the center of the two scroll bodies and their volume further decreases and the volume of the working chambers c1 and c2 reaches its minimum. This causes the medium in the working chambers a1, a2, b1, and b2 to further move toward the center of the two scroll bodies and be further compressed, and the medium in the working chambers c1 and c2 is completely discharged through the central outlet 230, thus ending one compression process and starting a new compression process as the orbiting scroll 300 revolves.

[0035] Because the two working chambers in each pair are arranged symmetrically with respect to the center of the scroll bodies, if the pressure in the two working chambers is not equal, i.e., if there is a pressure imbalance between the two working chambers arranged symmetrically with respect to the center of the scroll bodies, it may cause the orbiting scroll to rock radially during its revolution, and the radial shaking may cause the fixed scroll body and the orbiting scroll body to impact each other, increase wear, or even cause the orbiting scroll body to overturn, causing tangential leakage. However, as shown in FIGS. 4c and 4d, since the central outlet 230 is disposed in the fixed disk body 210 such that it moves relative to the orbiting scroll 300, the working chamber b1 (which may also be referred to as the first working chamber) will connect to the central outlet 230 when the orbiting scroll body 320 moves from the third position shown in FIG. 4c to the fourth position shown in FIG. 4d. However, the working chamber b2 (which may also be referred to as the second working chamber) cannot connect to the central outlet 230 due to the contact between the inner end 222 of the fixed scroll body 220 and the inner sidewall 324 of the orbiting scroll body 320, leading to the working chamber b1 connecting to the central outlet 230 before the working chamber b2. Thus, when the orbiting scroll body 320 moves from the third position shown in FIG. 4c to the fourth position shown in FIG. 4d, the working chamber b1 will discharge the medium before the working chamber b2. During this period, the pressure in the working chamber b1 is less than the pressure in the working chamber b2, i.e., a pressure imbalance between the working chamber b1 and the working chamber b2 is created because they cannot be connected to the central outlet 230 simultaneously. Additionally, it is worth noting that the pressure imbalance caused by the above-mentioned issue will only occur in the working chamber b1, which is located near the inner end 322 of the orbiting scroll body 320 and defined between the outer sidewall 325 of the orbiting scroll body and the inner sidewall 224 of the fixed scroll body 220, and in the working chamber b2, which is located near the inner end 222 of the fixed scroll body 220 and defined between the outer sidewall 225 of the fixed scroll body 220 and the inner sidewall 324 of the orbiting scroll body 320. Other pairs of working chambers will not have this pressure imbalance because they are not connected to the central outlet 230 (e.g., the working chambers a1 and a2) or are always connected to the central outlet 230 (e.g., the working chambers c1 and c2).

[0036] To address the above, the scroll compressor 10 is provided with an auxiliary groove 700 in the fixed scroll 200 and / or the orbiting scroll 300. This auxiliary groove 700 is configured to provide or form a channel connecting the central outlet 230 to the working chamber b2 when the orbiting scroll 300 is moved to a position that allows the central outlet 230 to connect to the working chamber b1. That is, when the orbiting scroll 300 moves to a position such that the central outlet 230 is connected to the working chamber b1, the inner end 222 of the fixed scroll body 220 is in contact with the inner sidewall 324 of the orbiting scroll body 320 as previously described, and the auxiliary groove 700 may provide or form a channel extending through the inner end 222 of the fixed scroll body 220 to connect the central outlet 230 to the working chamber b2.

[0037] In the above configuration, when the central outlet 230 is connected to the working chamber b1, the auxiliary groove 700 can form a channel connecting the central outlet 230 and the working chamber b2, thereby allowing the working chamber b2 to discharge the medium through the formed channel to the central outlet 230 to discharge the medium when the working chamber b1 discharges the medium through the central outlet 230. This ensures pressure balance between the working chamber b1 and the working chamber b2. Additionally, since the working chambers a1 and a2 are not connected to the central outlet 230 and the working chambers c1 and c2 are connected to the central outlet 230, the pressure balance between each pair of working chambers is ensured. This significantly reduces the radial rocking of the orbiting scroll 300 during revolution, thus avoiding the risk of the orbiting scroll body 320 overturning and tangential leakage between the orbiting scroll body 320 and the fixed scroll body 220 and mitigating wear and noise of the orbiting scroll body 320 and the fixed scroll body 220.

[0038] According to one optional embodiment, as shown in FIG. 2 and FIGS. 4a-4d, the auxiliary groove 700 is formed in the proximal surface 211 of the fixed disk body 210, i.e., recessed from the proximal surface 211 of the fixed disk body 210 along the axial direction XX'. In addition, the auxiliary groove 700 is further connected to the central outlet 230 or leads to the central outlet 230 and extends from the central outlet 230 around inner end 222 of the fixed scroll body 220 and across the inner end 222 of the fixed scroll body 220. That is, the auxiliary groove 700 has a proximal end 710 proximate the central outlet 230 and a distal end 720 away from the central outlet 230 and extends between the proximal end 710 and the distal end 720 about the inner end 222 of the fixed scroll body 220 such that the auxiliary groove 700 generally has a curved shape toward the inner end 222 of the fixed scroll body 220, i.e., a concave side of the curved shape faces toward the inner end 222 of the fixed scroll body 220. In addition, the auxiliary groove 700 also leads to the central outlet 230 at the proximal end 710, while the distal end 720 is positioned on two sides of the central outlet 230 at the inner end 222 of the fixed scroll body 220. In this configuration, when the working chamber b1 is connected to the central outlet 230, the working chamber b2 may be connected to the central outlet 230 through the auxiliary groove 700, thereby ensuring pressure balance between the working chamber b1 and the working chamber b2.

[0039] In particular, as shown in FIG. 2 and FIGS. 4a-4d, a sidewall of the auxiliary groove 700 is tangent to a sidewall of the central outlet 230 at the proximal end 710. That is, when viewed along the axial direction XX', the outline of the auxiliary groove 700 is tangent to the outline of the central outlet 230 at the proximal end 710. In this configuration, the sidewall of the auxiliary groove 700 may transition smoothly with the sidewall of the central outlet 230 at the proximal end 710, thereby ensuring that the medium in the working chamber b2 can be discharged smoothly into the central outlet 230 through the auxiliary groove 700 and thereby more reliably ensuring the pressure balance between the working chamber b1 and the working chamber b2.

[0040] In particular, as shown in FIG. 2 and FIGS. 4a-4d, the auxiliary groove 700 narrows along the direction from the proximal end 710 to the distal end 720, i.e., the auxiliary groove 700 has a maximum width at the proximal end 710 and a minimum width at the distal end 720. In this configuration, since the medium in the working chamber b2 enters the auxiliary groove 700 at the distal end 720 and enters the central outlet 230 at the proximal end 710, by making the width of the proximal end 710 greater than the width of the distal end 720, the flow rate of the medium discharged from the proximal end 710 into the central outlet 230 may be reduced, thereby allowing the central outlet 230 to discharge the media more stably, which also helps to more reliably ensure the pressure balance between the working chamber b1 and the working chamber b2. More particularly, the central outlet 230 is generally circular in shape, such that the central outlet 230, together with the auxiliary groove 700 form a shape similar to a "whale" or a "comma." In this configuration, the central outlet 230 and the auxiliary groove 700 provide a larger flow area for the medium in the working chamber b1 and the working chamber b2, thereby ensuring that the medium in both working chambers can be discharged smoothly.

[0041] In particular, as shown in FIG. 4c, during the revolution of the orbiting scroll 300 about the axial direction XX', the orbiting scroll 300 is adapted to move to a position (e.g., the third position shown in FIG. 4c) where the inner sidewall 324 of the orbiting scroll body 320 is tangent to the sidewall of the auxiliary groove 700 and the outer sidewall 325 of the orbiting scroll body 320 is tangent to the sidewall of the central outlet 230. That is, at the above position, when viewed along the axial direction XX', the outline of the inner sidewall 324 of the orbiting scroll body 320 is tangent to the outline of the auxiliary groove 700 and the outline of the outer sidewall 325 of the orbiting scroll body 320 is tangent to the outline of the central outlet 230. In this configuration, when the orbiting scroll 300 is in the third position shown in FIG. 4c, through the tangency of the two sets of outlines described above, the orbiting scroll body 320 may prevent the central outlet 230 from connecting to the working chamber b1 and at the same time prevent the auxiliary groove 700 from connecting to the working chamber b2. When the orbiting scroll 300 moves away from the third position (e.g., moves to the fourth position shown in FIG. 4d), the inner sidewall 324 of the orbiting scroll body 320 will intersect (or cross) the sidewall of the auxiliary groove 700, and the outer sidewall 325 of the orbiting scroll body 320 will simultaneously intersect the sidewall of the central outlet 230, allowing the orbiting scroll body 320 to allow the central outlet 230 to connect to the working chamber b1 and at the same time allow the auxiliary groove 700 to connect to the working chamber b2. This simultaneous connection allows the working chamber b1 and the working chamber b2 to discharge the media simultaneously, thereby ensuring that the pressure balance between the working chamber b1 and the working chamber b2 is maintained at all times, so that the orbiting scroll 300 does not experience radial rocking due to pressure imbalance between the working chambers at any time.

[0042] In particular, as shown in FIG. 2, the auxiliary groove 700 is recessed from the proximal surface 211 of the fixed disk body 210 and terminates at its bottom 730, i.e., the auxiliary groove 700 does not extend through the fixed disk body 210. In other words, the auxiliary groove 700 does not constitute a through hole, but only extends over a portion of the thickness of the fixed disk body 210 such that the bottom 730 of the auxiliary groove 700 is spaced apart from both the proximal surface 211 and the distal surface 212 of the fixed disk body 210. In this configuration, the pressure balance between the various working chambers can be ensured while also taking into account the strength of the fixed disk body 210, thereby avoiding an adverse impact on the reliability of the fixed scroll 200. Of course, this embodiment is merely exemplary, and in other embodiments, the auxiliary groove 700 may have other configurations as well. For example, referring to FIG. 5, a schematic perspective view of a fixed scroll of a scroll compressor according to another embodiment of the present disclosure is shown, which differs from the embodiments shown in FIG. 2 and FIGS. 4a-4d in that the auxiliary groove 700 extends through the fixed disk body 210, just like the central outlet 230. In this configuration, the medium in the working chamber b2 may be discharged directly through the auxiliary groove 700 without first being discharged through the auxiliary groove 700 to the central outlet 230 and then discharged through the central outlet 230. This maximizes the flow area for discharging the medium, which not only allows the medium in the working chamber b1 and the working chamber b2 to be discharged smoothly, thus helping to more reliably ensure the pressure balance between the various working chambers, but also allows the medium in the working chambers c1 and c2 to be discharged smoothly, thus helping to further improve the working performance of the scroll compressor 10.

[0043] While the above embodiment of disposing the auxiliary groove in the fixed scroll described with the aid of FIGS. 2-5 is merely exemplary, in other embodiments, the auxiliary groove may also be disposed in the orbiting scroll. For example, referring to FIG. 6, a schematic perspective view of an orbiting scroll of a scroll compressor according to yet another embodiment of the present disclosure is shown, which differs from the embodiments shown in FIGS. 2-5 in that an auxiliary groove 700 is provided on the orbiting scroll body 320 of the orbiting scroll 300. Specifically, as shown in FIG. 6, the auxiliary groove 700 is recessed from the top 321 of the orbiting scroll body 320 along the axial direction XX’ and extends from the inner end 322 of the orbiting scroll body 320 to the inner sidewall 324 of the orbiting scroll body 320. That is, the auxiliary groove 700 is open toward the inner sidewall 324 of the orbiting scroll body 320 and has a proximal end 710 located on the inner end 322 of the orbiting scroll body 320 and a distal end 720 located on the inner sidewall 324 of the orbiting scroll body 320. In this configuration, since the auxiliary groove 700 is recessed from the top 321 of the orbiting scroll body 320 and extends from the proximal end 710 located on the inner end 322 of the orbiting scroll body 320 to the distal end 720 located on the inner sidewall 324 of the orbiting scroll body 320, when the orbiting scroll 320 is in the fourth position shown in FIG. 4d, the auxiliary groove 700 may extend across the inner end 222 of the fixed scroll body 220, thereby connecting the central outlet 230 to the working chamber b2. This allows the medium in the working chamber b1 and the working chamber b2 to be discharged through the central outlet 230, ensuring the pressure balance between the working chamber b1 and the working chamber b2.

[0044] In particular, as shown in FIG. 6, the auxiliary groove 700 is recessed from the top 321 of the orbiting scroll body 320 and terminates at its bottom 730. That is, the auxiliary groove 700 does not extend to the proximal surface 311 of the orbiting disk body 310. In other words, the auxiliary groove 700 does not extend over the entire height of the orbiting scroll body 320, but only over a portion of the height of the orbiting scroll body 320, so that the bottom 730 of the auxiliary groove 700 is spaced apart from both the proximal surface 311 of the orbiting disk body 310 and the top 321 of the orbiting scroll body 320. In this configuration, the pressure balance between the various working chambers can be ensured while also taking into account the strength of the orbiting scroll body 320, thereby avoiding an adverse impact on the reliability of the orbiting scroll 300. Of course, this embodiment is merely exemplary, and in an embodiment not shown, the auxiliary groove 700 may also extend from the top 321 of the orbiting scroll body 320 to the proximal surface 311 of the orbiting disk body 310. That is, the auxiliary groove 700 may also extend over the entire height of the orbiting scroll body 320.

[0045] In particular, during the revolution of the orbiting scroll 300 about the axial direction XX', the orbiting scroll 300 is adapted to move to a position (e.g., the third position shown in FIG. 4c) where the inner end 222 of the fixed scroll body 220 is tangent to the inner sidewall 324 of the orbiting scroll body 320 at the distal end 720 of the auxiliary groove 700 and the outer sidewall 325 of the orbiting scroll body 320 is tangent to the sidewall of the central outlet 230. That is, at the above position, when viewed along the axial direction XX', the outline of the inner end 222 of the fixed scroll body 220 is tangent to the outline of the inner sidewall 324 of the orbiting scroll body 320 at the distal end 720 of the auxiliary groove 700, and the outline of the outer sidewall 325 of the orbiting scroll body 320 is tangent to the outline of the central outlet 230. In this configuration, when the orbiting scroll 300 is in the third position shown in FIG. 4c, through the tangency of the two sets of outlines described above, the orbiting scroll body 320 may prevent the central outlet 230 from connecting to the working chamber b1 and the fixed scroll body 220 can at the same time prevent the auxiliary groove 700 from connecting to the working chamber b2. When the orbiting scroll 300 moves away from the third position (e.g., moves to the fourth position shown in FIG. 4d), the distal end 720 of the auxiliary groove 700 will cross the inner end 222 of the fixed scroll 220, and the outer sidewall 325 of the orbiting scroll body 320 will simultaneously intersect the sidewall of the central outlet 230, allowing the orbiting scroll body 320 to allow the central outlet 230 to connect to the working chamber b1 and the fixed scroll body 220 to at the same time allow the auxiliary groove 700 to connect to the working chamber b2. This simultaneous connection allows the working chamber b1 and the working chamber b2 to discharge the media simultaneously, thereby ensuring that the pressure balance between the working chamber b1 and the working chamber b2 is maintained at all times, so that the orbiting scroll 300 does not experience radial rocking due to pressure imbalance between the working chambers at any time.

[0046] It is to be noted that although a different embodiment of the auxiliary groove is shown in FIG. 6, the embodiment shown in FIG. 6 may be combined with the embodiment shown in FIGS. 2-4d and the embodiment shown in FIG. 5, so that in a scroll compressor according to one embodiment not shown in the present disclosure, both the fixed disk body 210 of the fixed scroll 200 and the orbiting scroll body 320 of the orbiting scroll 300 are provided with auxiliary grooves 700 for connecting the working chamber b2 to the central outlet 230 when the working chamber b1 is connected to the central outlet 230. It will be understood by one skilled in the art that the above embodiments are also within the protective scope of the present disclosure.

[0047] The above optional but non-limiting examples of a scroll compressor according to the present disclosure are described in detail above with reference to the figures. For those skilled in the art, without departing from the spirit and substance of the present disclosure, modifications and additions to techniques and structures and recombination of features in various examples shall clearly be considered to be included within the scope of the present disclosure. As a result, these modifications and supplements that may be conceived under the guidance of the present disclosure shall be considered as a part of the present disclosure. The scope of the present disclosure includes known equivalent technologies and equivalent technologies not yet foreseen as of the filing date of this disclosure.

Claims

1. A scroll compressor comprising: a stationary fixed scroll (200), the fixed scroll (200) comprising a fixed disk body (210) having a central outlet (230) and a fixed scroll body (220) protruding from a surface of the fixed disk body (210); anda movable orbiting scroll (300), the orbiting scroll (300) comprising an orbiting disk body (310) and an orbiting scroll body (320) protruding from a surface of the orbiting disk body (310),wherein the fixed scroll body (220) and the orbiting scroll body (320) respectively extend along an involute line and engage with each other to define a plurality of working chambers, the plurality of working chambers comprising a first working chamber (b1) near an inner end of the orbiting scroll body (320) and defined between an outer sidewall of the orbiting scroll body (320) and an inner sidewall of the fixed scroll body (220) and a second working chamber (b2) near an inner end of the fixed scroll body (220) and defined between an outer sidewall of the fixed scroll body (220) and an inner sidewall of the orbiting scroll body (320), andwherein the fixed scroll (200) and / or the orbiting scroll (300) is provided with an auxiliary groove (700) configured to connect the second working chamber (b2) to the central outlet (230) when the first working chamber (b1) is connected to the central outlet (230).

2. The scroll compressor according to claim 1, wherein the inner end of the fixed scroll body (220) is configured to be in contact with the inner sidewall of the orbiting scroll body (320) when the first working chamber (b1) is connected to the central outlet (230), and the auxiliary groove (700) is configured to extend across the inner end of the fixed scroll body (220) when the first working chamber (b1) is connected to the central outlet (230).

3. The scroll compressor according to claim 1, wherein the auxiliary groove (700) is formed in the fixed disk body (210) and recessed from a surface of the fixed disk body (210), and the auxiliary groove (700) leads to the central outlet (230) at a proximal end (710) and extends across the inner end of the fixed scroll body (220) from the proximal end (710) to a distal end (720).

4. The scroll compressor according to claim 3, wherein the distal end (720) of the auxiliary groove (700) and the central outlet (230) are located on two sides of the inner end of the fixed scroll body (220).

5. The scroll compressor according to claim 3, wherein the auxiliary groove (700) extends between the proximal end (710) and the distal end (720) about the inner end of the fixed scroll body (220) so that the auxiliary groove (700) has a shape that curves towards the inner end of the fixed scroll body (220).

6. The scroll compressor according to claim 3, wherein a sidewall of the auxiliary groove (700) is tangent to a sidewall of the central outlet (230) at the proximal end (710).

7. The scroll compressor according to claim 3, wherein the auxiliary groove (700) narrows along a direction from the proximal end (710) to the distal end (720).

8. The scroll compressor according to claim 3, wherein the orbiting scroll (300) is adapted to be moved to a position where the outer sidewall of the orbiting scroll body (320) is tangent to a sidewall of the central outlet (230) and the inner sidewall of the orbiting scroll body (320) is tangent to a sidewall of the auxiliary groove (700).

9. The scroll compressor according to claim 3, wherein the auxiliary groove (700) extends from a surface of the fixed disk body (210) to a portion of a thickness of the fixed disk body (210).

10. The scroll compressor according to claim 3, wherein the auxiliary groove (700) extends through the fixed disk body (210).

11. The scroll compressor according to claim 1, wherein the auxiliary groove (700) is formed in the orbiting scroll body (320) and recessed from a top of the orbiting scroll body (320), and the auxiliary groove (700) extends from a proximal end (710) located on the inner end of the orbiting scroll body (320) to a distal end (720) located on the inner sidewall of the orbiting scroll body (320).

12. The scroll compressor according to claim 11, wherein the orbiting scroll (300) is adapted to be moved to a position where the inner end of the fixed scroll body (220) is tangent to the inner sidewall of the orbiting scroll body (320) at a distal end (720) of the auxiliary groove (700) and the outer sidewall of the orbiting scroll body (320) is tangent to a sidewall of the central outlet (230).

13. The scroll compressor according to claim 11, wherein the auxiliary groove (700) extends from a top of the orbiting scroll body (320) to a portion of a height of the orbiting scroll body (320).

14. The scroll compressor according to claim 11, wherein the auxiliary groove (700) extends from a top of the orbiting scroll body (320) to a surface of the orbiting disk body (310).

15. The scroll compressor according to claim 2, wherein the auxiliary groove (700) is formed in the fixed disk body (210) and recessed from a surface of the fixed disk body (210), and the auxiliary groove (700) leads to the central outlet (230) at a proximal end (710) and extends across the inner end of the fixed scroll body (220) from the proximal end (710) to a distal end (720).

16. The scroll compressor according to claim 2, wherein the auxiliary groove (700) is formed in the orbiting scroll body (320) and recessed from a top of the orbiting scroll body (320), and the auxiliary groove (700) extends from a proximal end (710) located on the inner end of the orbiting scroll body (320) to a distal end (720) located on the inner sidewall of the orbiting scroll body (320).

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