Scroll compressor

Abstract

A scroll compressor is provided. The scroll compressor may include a main frame, a rotating shaft, an orbiting scroll, and a fixed scroll, an extended wrap extending from a discharge end of the fixed wrap in a wrap forming direction of the fixed wrap may be formed in a stepped shape, and a wrap accommodating groove may be formed between an outer circumferential surface and an inner circumferential surface of the orbiting wrap. The extension wrap is rotatably inserted therein. Therefore, the rotating shaft can penetrate through the orbiting scroll, so that the upsetting moment of the orbiting scroll can be reduced, and the strength of the scroll part at the discharge end of the fixed scroll part can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a scroll compressor, and more particularly, to a shaft penetration scroll compressor in which a rotating shaft penetrates a revolving scroll. BACKGROUND

[0002] A compressor used in a refrigeration cycle of a refrigerator or an air conditioner, etc. performs a function of compressing and transferring refrigerant gas to a condenser after the compression. An air conditioner mainly uses a rotary compressor or a scroll compressor, and the scroll compressor is not only applied to an air conditioner, but also to a water heater compressor requiring a higher compression ratio than the air conditioner in recent years.

[0003] The scroll compressor can be classified into a hermetic type compressor including a driving part (or a motor part) and a compression part in one housing and an open type compressor in which the driving part (or the motor part) and the compression part are independently provided, into an upper compression type if the compression part is positioned at an upper side of the driving part, into a lower compression type if the compression part is positioned at a lower side of the driving part, into a low pressure type if a space in which the driving part is accommodated is suction pressure, and into a high pressure type if the space in which the driving part is accommodated is discharge pressure.

[0004] In addition, the scroll compressor includes a fixed scroll having a fixed scroll wrap and a revolving scroll having a revolving scroll wrap engaged with the fixed scroll wrap. The scroll compressor can be classified into a revolving back pressure type and a fixed back pressure type according to a back pressure method. The revolving back pressure type is a method in which a back pressure chamber is formed at a back surface of the revolving scroll, and the fixed back pressure type is a method in which a back pressure chamber is formed at a back surface of the fixed scroll. Generally, in the fixed back pressure type, the fixed scroll is defined as a non-revolving scroll and is described.

[0005] In the revolving back pressure type and the fixed back pressure type, since the revolving scroll is coupled to the rotating shaft and is rotatably supported to the main frame, the revolving scroll is subjected to a overturning moment generated by a gas pressure of the compression chamber. Thus, the revolving scroll is coupled to the rotating shaft, and it is advantageous to reduce the overturning moment in a case in which a gap between a first action point of a centrifugal force (bearing reaction force) action and a second action point of a gas pressure action is formed as small as possible.

[0006] Thus, in the related art, as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 08-326671), a shaft-penetration scroll compressor in which a rotating shaft penetrates a revolving scroll is disclosed. However, in the shaft-penetration scroll compressor of Patent Document 1, since the rotating shaft penetrates the revolving scroll, a compression chamber cannot be formed in the center portion of the revolving scroll. Thus, the compression ratio decreases, and the volumetric efficiency decreases. In addition, since the discharge port is formed eccentrically from the center of the compression portion, the compression cycle becomes short, and the compression ratio decreases. Furthermore, the thickness of the discharge-side wrap portion of the fixed scroll portion decreases, and the reliability decreases.

[0007] In view of this, in the related art, as described in Patent Document 2 (Japanese Patent Application Laid-Open No. 05-071477), a multi-stage scroll compressor in which the height of the suction-side wrap portion is higher and the height of the discharge-side wrap portion is lower is disclosed. However, in the multi-stage scroll compressor of Patent Document 2, the length of the rotating shaft coupling portion (boss portion) of the revolving scroll coupled to the rotating shaft is long, and the first point described above is far from the second point, and the overturning moment increases accordingly. Furthermore, since the stepped surface is on the suction side, when the revolving scroll revolves, a compression chamber inter-leakage occurs at the time point at which the stepped surface of the revolving scroll and the stepped surface of the fixed scroll are separated, and the compression efficiency decreases. SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] An object of the present application is to provide a scroll compressor capable of reducing the overturning moment of a revolving scroll and improving the strength of a wrap portion.

[0010] Another object of the present application is to provide a scroll compressor capable of improving the strength of a wrap portion and suppressing compression chamber inter-leakage.

[0011] Still another object of the present application is to provide a scroll compressor capable of improving the strength of a wrap portion while suppressing compression chamber inter-leakage and improving the pressure ratio.

[0012] Still another object of the present application is to provide a scroll compressor capable of improving the strength of a wrap portion by forming the height of the wrap portion differently.

[0013] Still another object of the present application is to provide a scroll compressor capable of suppressing damage to a wrap portion by forming the height of the wrap portion differently.

[0014] TECHNICAL SOLUTION

[0015] To achieve the object of the present application, a scroll compressor can be provided including a main frame, a rotating shaft, a revolving scroll, and a fixed scroll. The main frame can be fixed to the inside of a housing. The rotating shaft can be penetrated through and supported by the main frame, and can be provided with an eccentric portion. The revolving scroll can be provided with a revolving end plate portion coupled to the eccentric portion of the rotating shaft, a revolving wrap portion extending from one side surface of the revolving end plate portion, and a rotating shaft coupling portion formed to penetrate through the center portion of the revolving end plate portion and to be penetrated through and coupled to the eccentric portion of the rotating shaft. The fixed scroll can be provided with a fixed end plate portion having a discharge port, and a fixed wrap portion extending from the fixed end plate portion toward the revolving end plate portion and forming compression chambers together with the revolving wrap portion at both side surfaces, respectively. The fixed wrap portion can be formed with a stepped extension wrap portion extending from a discharge end of the fixed wrap portion adjacent to the discharge port in the wrap formation direction of the fixed wrap portion, and a wrap receiving groove can be formed between the outer and inner circumferential surfaces of the revolving wrap portion for the extension wrap portion to be revolvably inserted therein. Thus, the rotating shaft can penetrate through the revolving scroll, thereby reducing the overturning moment of the revolving scroll and improving the wrap strength at the discharge end of the fixed wrap portion.

[0016] As an example, the wrap height of the extension wrap portion can be formed to be lower than the wrap height of the fixed wrap portion. Thus, the wrap strength of the extension wrap portion can be secured and the wrap at the discharge end of the fixed wrap portion can be prevented from being damaged.

[0017] For example, in the extension wrap portion, at least a portion of the wrap height can be formed to be less than or equal to half of the wrap height of the fixed wrap portion. Thus, the wrap strength at the extension wrap portion can be secured by reducing the gas pressure applied to the extension wrap portion as much as possible.

[0018] As another example, the wrap thickness of the extension wrap portion can be formed to be less than or equal to the wrap thickness of the fixed wrap portion. Thus, the wrap length of the fixed wrap portion can be maintained, and the wrap strength of the fixed wrap portion can be improved by forming the extension wrap portion at the discharge end of the fixed wrap portion.

[0019] For example, the wrap thickness of the extension wrap portion can be formed to decrease in a direction away from the discharge end of the fixed wrap portion. Thus, the extension wrap portion and the wrap sealing surface facing the same can be smoothly in contact, thereby preventing leakage between the compression chambers.

[0020] Further, at least a portion of the scroll thickness of the extended scroll portion can be formed to be greater than or equal to a scroll length extending in a scroll formation direction of the extended scroll portion. Thereby, the scroll strength of the extended scroll portion can be improved by forming the thickness of the extended scroll portion as thick as possible.

[0021] As still another example, a first scroll sealing surface of a circular arc shape can be formed between the discharge-side end of the wrap scroll portion and the rotating shaft coupling portion connected thereto, for the discharge end of the fixed scroll to contact. The scroll receiving groove can be formed with a stepped scroll support surface to axially slidably support the scroll cross section of the extended scroll portion. Thereby, during the orbiting movement of the orbiting scroll relative to the fixed scroll, the extended scroll portion can be prevented from being interfered with by the orbiting scroll.

[0022] For example, the scroll receiving groove can be formed with a second scroll sealing surface extending from the scroll support surface and contacting the end of the extended scroll portion. The second scroll sealing surface can be formed in a circular arc shape inside the scroll formation direction of the scroll support surface. Thereby, the extended scroll portion can be in line contact with the scroll sealing surface, and thus the compression chamber inter leakage can be effectively suppressed.

[0023] Specifically, the curvature of the second scroll sealing surface can be formed to be the same as the curvature of the first scroll sealing surface. Thereby, not only the discharge end of the fixed scroll and the end of the extended scroll portion can be easily machined, but also the scroll sealing surface can be easily machined.

[0024] Further, the end of the extended scroll portion and the second scroll sealing surface of the scroll receiving groove facing the same can be spaced apart from each other at a discharge start angle of at least one of the two compression chambers. Thereby, even if the two compression chambers are communicated, the refrigerant of the two compression chambers moves to the discharge port and is simultaneously discharged.

[0025] Further, the end of the extended scroll portion and the second scroll sealing surface of the scroll receiving groove facing the same can be formed to be spaced apart from each other in the discharge stroke of the two compression chambers. Thereby, even if the two compression chambers are communicated, the compression loss at the two compression chambers can be suppressed.

[0026] As still another example, the extended scroll portion can be formed at the same height in the scroll formation direction of the fixed scroll portion. Thereby, the scroll strength of the fixed scroll portion can be improved while ensuring the scroll strength at the extended scroll portion.

[0027] As still another example, the extension scroll portion can be formed in a stepped manner at a plurality of heights along a scroll formation direction of the fixed scroll portion. Thus, the volume of the compression chamber can be reduced in stages, and even if the extension scroll portion is formed longer in length, not only can the reliability of the fixed scroll portion and / or the extension scroll portion be ensured, but the compression ratio can also be further improved by extending the compression length of the compression chamber longer.

[0028] As still another example, the extension scroll portion can be formed to be lower along a scroll formation direction of the fixed scroll portion. Thus, the volume of the compression chamber can be gradually reduced, and even if the extension scroll portion is formed longer in length, not only can the reliability of the fixed scroll portion and / or the extension scroll portion be ensured, but the compression ratio can also be further improved by extending the compression length of the compression chamber longer.

[0029] Inventive Effects

[0030] In the scroll compressor of the present application, an extension scroll portion extending from a discharge end of a fixed scroll portion along a scroll formation direction of the fixed scroll portion can be formed in a stepped manner, and a scroll accommodating groove into which the extension scroll portion is rotatably inserted can be formed between an outer circumferential surface and an inner circumferential surface of a revolving scroll portion. Thus, the rotating shaft can penetrate the revolving scroll, thereby enabling the overturning moment of the revolving scroll to be reduced and the scroll strength at the discharge end of the fixed scroll portion to be improved.

[0031] In the scroll compressor of the present application, the scroll height of the extension scroll portion can be formed lower than the scroll height of the fixed scroll portion. Thus, the scroll strength of the extension scroll portion can be ensured and the scroll at the discharge end of the fixed scroll portion can be prevented from being damaged.

[0032] In the scroll compressor of the present application, the scroll thickness of the extension scroll portion can be formed to be less than or equal to the scroll thickness of the fixed scroll portion. Thus, the scroll length of the fixed scroll portion can be maintained and the extension scroll portion can be formed at the discharge end of the fixed scroll portion, thereby improving the scroll strength of the fixed scroll portion.

[0033] In the scroll compressor of the present application, a stepped scroll support surface can be formed in the scroll accommodating groove of the revolving scroll to axially slidably support the scroll cross section of the extension scroll portion. Thus, during the revolving movement of the revolving scroll with respect to the fixed scroll, the extension scroll portion can be prevented from being interfered with by the revolving scroll. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a sectional view showing the scroll compressor of the present embodiment.

[0035] Figure 2 is a sectional view showing the scroll compressor of the present embodiment. Figure 1An exploded perspective view of the rotating and fixed vortex disks.

[0036] Figure 3 It is Figure 2 A top view showing the assembly of the rotary and fixed scroll disks.

[0037] Figure 4 It is along Figure 3 A sectional view of the “Ⅸ-Ⅸ” line.

[0038] Figure 5 It is shown Figure 2 A top view of the extended spiral section.

[0039] Figure 6 It is along Figure 5 A cross-sectional view of the “XX” line.

[0040] Figure 7a and Figure 7b It is a schematic diagram showing the relationship between the extended vortex section and the vortex section receiving groove.

[0041] Figure 8 This is a perspective view showing another embodiment of the extended scroll portion and the scroll portion receiving groove.

[0042] Figure 9 It is shown Figure 8 A top view of the extended spiral section.

[0043] Figure 10 It is along Figure 9 A cross-sectional view of the "XI-XI" line.

[0044] Figure 11 This is a perspective view showing another embodiment of the extended volute and the volute receiving groove.

[0045] Figure 12 It is shown Figure 11 A top view of the extended spiral section.

[0046] Figure 13 It is along Figure 12 A sectional view of the "XII-XII" line. Detailed Implementation

[0047] The scroll compressor of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, some descriptions of the constituent elements may be omitted to clearly illustrate the features of the present invention.

[0048] Further, "upper side" used in the following description indicates a direction away from a support surface of a scroll compressor supporting an embodiment of the present application, i.e., when the driving portion (motor portion or driving motor) and the compression portion are centered, the driving portion (motor portion or driving motor) side indicates the upper side. "Lower side" indicates a direction close to the support surface, i.e., when the driving portion (motor portion or driving motor) and the compression portion are centered, the compression portion side indicates the lower side.

[0049] Further, the term "axial direction" used in the following description indicates a lengthwise direction of the rotational shaft. The "axial direction" can be understood as the up-and-down side direction. The "radial direction" indicates a direction intersecting the rotational shaft.

[0050] Further, in the following description, a closed-type scroll compressor in which the driving portion (motor portion or driving motor) and the compression portion are provided in the housing is exemplified. However, it can be equally applied to an open-type compressor in which the driving portion (motor portion or driving motor) is provided outside the housing and connected to the compression portion provided inside the housing.

[0051] Further, in the following description, a vertical-type scroll compressor in which the motor portion and the compression portion are arranged in the up-and-down axial direction and the compression portion is positioned closer to the lower side than the driving portion (motor portion or driving motor) is exemplified. However, it can be equally applied to a horizontal-type scroll compressor in which the driving portion (motor portion or driving motor) and the compression portion are arranged left and right and an upper compression-type scroll compressor in which the compression portion is positioned closer to the upper side than the driving portion (motor portion or driving motor).

[0052] Further, in the following description, a lower compression-type scroll compressor in which the refrigerant suction pipe constituting the suction passage is directly connected to the compression portion and the refrigerant discharge pipe is communicated with the internal space of the housing to make the internal space of the housing constitute the high-pressure discharge is exemplified.

[0053] Figure 1 FIG. 1 is a longitudinal sectional view showing the inside of the lower compression-type scroll compressor of the present embodiment.

[0054] Referring to Figure 1 In the high-pressure and lower compression-type scroll compressor (hereinafter, simply referred to as a scroll compressor and described) of the present embodiment, a driving motor 120 constituting a motor portion is provided in the upper half of a housing 110, and a main frame 130, a revolving scroll 140, a fixed scroll 150, and a discharge cover 160 are included in the lower side of the driving motor 120. Generally, the driving motor 120 constitutes the motor portion as described above, and the main frame 130, the revolving scroll 140, the fixed scroll 150, and the discharge cover 160 constitute a compression portion C.

[0055] The driving motor 120 constituting the electric part is coupled to the upper end of the rotary shaft 125 described later, and the compression part C is coupled to the lower end of the rotary shaft 125. Thus, the compressor 10 constitutes the lower compression type structure described above, and the compression part C is connected to the driving motor 120 by the rotary shaft 125 and operates by the rotational force of the driving motor 120. Therefore, the driving motor 120 can be understood as a driving part that drives the compression part C, and hereinafter, the driving motor can be described in connection with the electric part or the driving part.

[0056] Referring to Figure 1 The housing 110 of the present embodiment can include a cylindrical case 111, an upper case 112, and a lower case 113. The cylindrical case 111 is a cylindrical shape with both upper and lower ends opened, the upper case 112 is coupled to cover the upper end of the cylindrical case 111 that is opened, and the lower case 113 is coupled to cover the lower end of the cylindrical case 111 that is opened. Thus, the inner space (not labeled) of the housing 110 is sealed, and the inner space (not labeled) of the sealed housing 110 is divided into a lower space S1 and an upper space S2 with the driving motor 120 as a reference.

[0057] The driving motor 120 and the main frame 130 described above are inserted and fixed in the inside of the cylindrical case 111. An oil recovery passage (not shown) that is spaced apart from the inner circumferential surface of the cylindrical case 111 by a predetermined interval can be formed on the outer circumferential surface of the driving motor 120 and the outer circumferential surface of the main frame 130.

[0058] A refrigerant suction pipe 115 can be coupled through the side surface of the cylindrical case 111. Thus, the refrigerant suction pipe 115 penetrates the cylindrical case 111 constituting the housing 110 in the radial direction and is coupled thereto.

[0059] A refrigerant discharge pipe 116 can be coupled through the upper portion of the upper case 112, so that the inner side end of the refrigerant discharge pipe 116 communicates with the inner space (not labeled) of the housing 110, specifically, the upper space S2 formed on the upper side of the driving motor 120.

[0060] One side end of an oil circulation pipe (not shown) can be coupled through the lower half of the lower case 113 in the radial direction. Both ends of the oil circulation pipe can be open, and the other end of the oil circulation pipe can be coupled through the refrigerant suction pipe 115. An oil circulation valve (not shown) can be provided in the middle of the oil circulation pipe.

[0061] Referring to Figure 1 The driving motor 120 of the present embodiment includes a stator 121 and a rotor 122. The stator 121 is inserted and fixed to the inner circumferential surface of the cylindrical case 111, and the rotor 122 is rotatably provided in the inside of the stator 121.

[0062] The stator 121 includes a stator core 1211 and a stator coil 1212.

[0063] The stator core 1211 is formed in a ring shape or a hollow cylindrical shape, and is fixed to the inner circumferential surface of the cylindrical case 111 in a thermal press-in manner.

[0064] The stator coil 1212 is wound on the stator core 1211, and is electrically connected to an external power source through a power cable (not shown) penetratingly coupled to the case 110.

[0065] The rotor 122 includes a rotor core 1221 and a permanent magnet 1222.

[0066] The rotor core 1221 is rotatably inserted into the stator core 1211 with a predetermined gap (not shown) therebetween. The permanent magnet 1222 is embedded in the inside of the rotor core 1221 at a predetermined interval in the circumferential direction.

[0067] A rotating shaft 125 is coupled to the center of the rotor core 1221. The upper end of the rotating shaft 125 is press-fitted and coupled to the rotor 122, and the lower end of the rotating shaft 125 is rotatably inserted into and radially supported by the main frame 130. Thus, the orbiting scroll 140 eccentrically coupled to the rotating shaft 125 performs an orbiting motion with respect to the fixed scroll 150.

[0068] The compression part C of the present embodiment includes the main frame 130, the orbiting scroll 140, the fixed scroll 150, and the discharge cover 160. For example, the fixed scroll 150 can be disposed at the lower side of the main frame 130, and the orbiting scroll 140 is axially supported by the fixed scroll 150 and rotatably disposed between the main frame 130 and the fixed scroll 150.

[0069] Referring to Figure 1 , the main frame 130 includes a frame end plate part 131, a frame side wall part 132, and a main bearing part 133. The frame end plate part 131 is disposed at the lower side of the drive motor 120. A main bearing hole 1331 constituting the main bearing part 133 described later is formed in the center of the frame end plate part 131 in the axial direction. The frame side wall part 132 extends in a cylindrical shape from the lower side surface edge of the frame end plate part 131 and is fixed to the inner circumferential surface of the cylindrical case 111 in a thermal press-in manner or is fusion-bonded to the inner circumferential surface of the cylindrical case 111. The main bearing part 133 is provided with the main bearing hole 1331 for rotatably inserting and radially supporting the rotating shaft 125.

[0070] Referring to Figure 1 , the orbiting scroll 140 includes an orbiting end plate part 141, an orbiting scroll wrap part 142, and a rotating shaft coupling part 143.

[0071] The scroll end plate portion 141 is formed in a disc shape and is housed between the frame end plate portion 131 and a later-described fixed end plate portion 151. The top surface of the scroll end plate portion 141 can be supported in the axial direction to the main frame 130 via the back pressure sealing member 135. Thus, the back surface of the scroll end plate portion forms the back pressure chambers 136a, 136b between the main frame 130 facing thereto.

[0072] The scroll wrap portion 142 can extend from the bottom surface of the scroll end plate portion 141 toward the later-described fixed end plate portion 151, engage with the later-described fixed wrap portion 154, and form the first compression chamber V1 and the second compression chamber V2 described above.

[0073] The scroll wrap portion 142 can be formed in an involute shape. However, the scroll wrap portion 142 can be formed in various shapes other than the involute shape together with the fixed wrap portion 154. For example, the scroll wrap portion 142 can have a shape in which a plurality of circular arcs having different diameters and origins are connected, and the outermost contour can be formed in a substantially elliptical shape having a major axis and a minor axis. The fixed wrap portion 154 can also be formed similarly. Hereinafter, the above-described formation can be defined as a hybrid or atypical wrap portion shape and will be described.

[0074] The inner side end portion of the scroll wrap portion 142 is formed at the central portion of the scroll end plate portion 141, and a rotation shaft coupling portion 143 is formed to penetrate in the axial direction at the central portion of the scroll end plate portion 141. Thus, the discharge port 1511 described later is formed at a position eccentric from the center of the scroll wrap plate 140, in other words, from the rotation shaft coupling portion 143.

[0075] The rotation shaft 125 is rotatably inserted and coupled to the rotation shaft coupling portion 143. Thus, the outer peripheral portion of the rotation shaft coupling portion 143 is connected to the scroll wrap portion 142 and forms the first compression chamber V1 together with the fixed wrap portion 154 during compression.

[0076] The rotation shaft coupling portion 143 is formed at a height at which the eccentric portion 1251 of the rotation shaft 125 overlaps the scroll wrap portion 142 in the same plane. In other words, the rotation shaft coupling portion 143 is formed at a height at which the eccentric portion 1251 of the rotation shaft 125 overlaps the scroll wrap portion 142 in the same plane. Thus, the repulsive force and the compression force of the refrigerant cancel each other based on the scroll end plate portion 141 being applied to the same plane, and thus, the overturning moment of the scroll wrap plate 140 due to the effects of the compression force and the repulsive force can be canceled, and thus, the inclination of the scroll wrap plate 140 can be suppressed.

[0077] In addition, the outer circumferential surface of the rotation shaft coupling portion 143 and the inner circumferential surface of the orbit scroll portion 142 facing the same can be connected using a circular arc surface, and a scroll portion support surface 1425, which will be described later, can be formed in a stepped shape on the circular arc surface. Thus, during the orbiting motion of the orbiting scroll 140 with respect to the fixed scroll 150, the extended scroll portion 1541 of the fixed scroll 150 can be prevented from being interfered with by the orbit scroll portion 142. For this, the extended scroll portion 1541 will be described again later.

[0078] Referring to Figure 1 The fixed scroll 150 of the present embodiment includes a fixed end plate portion 151, a fixed side wall portion 152, a sub-bearing portion 153, and a fixed scroll portion 154.

[0079] The fixed end plate portion 151 is formed in a disc shape and is disposed at a lower side of the frame end plate portion 131 with a predetermined interval therebetween. A sub-bearing hole 1531 constituting the sub-bearing portion 153 is formed to penetrate the fixed end plate portion 151 in the vertical direction at the center thereof. A discharge port 1511 is formed at the periphery of the sub-bearing hole 1531, and the discharge port 1511 communicates with the first compression chamber V1 and the second compression chamber V2, which will be described later, respectively, and discharges the refrigerant compressed to the muffler space 160a of the discharge cover 160.

[0080] The discharge port 1511 is formed at a position eccentric from the center of the fixed end plate portion 151. In other words, as the sub-bearing hole 1531 is formed at the center of the fixed end plate portion 151, the discharge port 1511 is formed at a position eccentric from the sub-bearing hole 1531.

[0081] The fixed side wall portion 152 extends in the vertical direction from the top surface edge of the fixed end plate portion 151 and is coupled to the frame side wall portion 132 of the main frame 130. A suction port (not shown) is formed to penetrate the fixed side wall portion 152 in the radial direction. As described above, the end portion of the refrigerant suction pipe 115 penetrating the cylindrical shell 111 is inserted into and coupled to the suction port (not shown).

[0082] The cylindrical sub-bearing hole 1531 is formed to penetrate the sub-bearing portion 153 in the axial direction at the center thereof and supports the lower end portion of the rotation shaft 125 in the radial direction.

[0083] The fixed scroll portion 154 is formed to extend in the axial direction from the top surface of the fixed end plate portion 151 toward the orbiting scroll 140. The fixed scroll portion 154 is engaged with the orbit scroll portion 142 and forms the compression chamber V. With respect to the compression chamber V, the first compression chamber V1 is formed between the inner side surface of the fixed scroll portion 154 and the outer side surface of the orbit scroll portion 142, and the second compression chamber V2 is formed between the outer side surface of the fixed scroll portion 154 and the inner side surface of the orbit scroll portion 142.

[0084] Since the fixed scroll portion 154 is formed in correspondence with the shape of the above-described scroll portion 144, the description of the scroll portion 144 is replaced by the description of the fixed scroll portion 154. However, the fixed scroll portion 154 of the present embodiment can be formed with an extension scroll portion 1541 extending from the discharge end 154a thereof. In other words, the discharge end 154a of the fixed scroll portion 154 can be formed with the extension scroll portion 1541 extending in the scroll portion forming direction of the fixed scroll portion 154 and inserted into the scroll portion accommodating groove 1422 of the above-described scroll portion 142 in a stepped manner.

[0085] The scroll portion height H12 of the extension scroll portion 1541 can be formed lower than the scroll portion height H11 at the discharge end 154a of the fixed scroll portion 154 to which the extension scroll portion 1541 is connected. Thereby, the fixed scroll portion 154 can improve the scroll portion strength at the discharge end 154a. The extension scroll portion 1541 will be described again later together with the scroll portion accommodating groove 1422.

[0086] Referring to Figure 1 The discharge cover 160 can be coupled to the back surface of the fixed scroll 150. A muffler space 160a can be provided inside the discharge cover 160, and the discharge port 1511 penetrating the fixed scroll 150 can be accommodated in the muffler space 160a. Thereby, the refrigerant discharged from the compression chamber V through the discharge port 1511 passes through the muffler space 160a and moves to the upper space S2.

[0087] The scroll compressor of the present embodiment as described above operates in the following manner.

[0088] That is, if power is applied to the drive motor 120, the rotor 122 and the rotating shaft 125 generate a rotational force and rotate, and the scroll portion 140 eccentrically coupled to the rotating shaft 125 performs a scroll motion with respect to the fixed scroll 150 through the cross ring 170.

[0089] In this way, the volumes of the first and second compression chambers V1, V2 gradually decrease from the outer sides of the respective compression chambers V1, V2 toward the center side. In this way, the refrigerant is sucked into the first and second compression chambers V1, V2 through the refrigerant suction pipe 115.

[0090] In this way, the refrigerant moves along the movement tracks of the respective compression chambers V1, V2 and is compressed, and the compressed refrigerant is discharged to the muffler space 160a of the discharge cover 160 through the discharge port 1511 communicating with the compression chamber V.

[0091] Thus, the refrigerant is discharged to the discharge space (not shown) between the main frame 130 and the drive motor 120 through the discharge hole (not shown) provided in the fixed scroll 150 and the main frame 130, and is moved to the upper space S2 of the housing 110 formed on the upper side of the drive motor 120 by the drive motor 120. The refrigerant is separated into the refrigerant and the oil in the upper space S2, and the refrigerant is discharged to the outside of the housing 110 through the refrigerant discharge pipe 116, and, on the contrary, the oil separated from the refrigerant is recovered to the lower space S1 of the housing 110 forming the oil storage space through the oil recovery passage (not shown) described above. The oil is repeatedly supplied to the respective sliding portions and the compression chambers V through the oil flow path 126 of the rotating shaft 125, and is recovered to the lower space S1 of the housing 110 in a series of processes.

[0092] On the other hand, as described above, the back pressure chamber 136 is formed between the orbiting scroll 140 and the main frame 130 facing each other to prevent the orbiting scroll 140 from being pushed away from the fixed scroll 150 by the pressure of the compression chambers V1, V2. In other words, the back pressure sealing member 135 can be provided between the orbiting scroll 140 and the main frame 130, and the first back pressure chamber 136a having a higher back pressure can be formed on the inner side and the second back pressure chamber 136b having a lower back pressure can be formed on the outer side through the back pressure sealing member 135.

[0093] Thus, the center portion of the orbiting scroll 140 is subjected to the back pressure higher than the edge of the orbiting scroll 140, so that the center portion of the orbiting scroll 140 is more pressed and adhered to the fixed scroll 150 side than the edge portion. At the same time, the center portion of the fixed scroll portion 154 forming the discharge end 154a can be subjected to the discharge pressure, so that the discharge end 154a of the fixed scroll portion 154 is bent to the outer side.

[0094] As shown in the present embodiment, the above-described situation can be more serious in the case where the sub bearing hole 1531 is formed in the center portion of the fixed scroll 150 so as to be penetrated by the rotating shaft 125. In other words, if the sub bearing hole 1531 is formed in the center of the fixed scroll 150, the discharge end 154a of the fixed scroll portion 154 cannot be extended to the center of the fixed scroll 150 due to the sub bearing hole 1531, and thus the discharge end 154a of the fixed scroll portion 154 is located away from the center of the fixed end plate portion 151, so that the scroll portion strength at the discharge end 154a is correspondingly reduced, resulting in an increase in the scroll portion deformation.

[0095] In addition, as shown in the present embodiment, in the case where the compression ratio is increased by changing the fixed scroll portion 154 and the orbiting scroll portion 142 into a non-typical shape, the above-described situation becomes more serious, and even if the protruding portion is formed at the discharge end 154a of the fixed scroll portion 154, the scroll portion support force does not increase with the increase in the compression ratio, which becomes a cause of the friction loss or wear and / or scroll portion breakage at the discharge end 154a of the fixed scroll portion 154 due to the deformation of the scroll portion.

[0096] Thus, in the present embodiment, the scroll portion strength of the discharge end 154a of the fixed scroll portion 154 can be increased by forming the extension scroll portion 1541 extending in the formation direction of the fixed scroll portion 154 at the discharge end 154a of the fixed scroll portion 154.

[0097] Figure 2 is an exploded perspective view showing the orbiting scroll and the fixed scroll in Figure 1 , Figure 3 is an assembled plan view showing the orbiting scroll and the fixed scroll in Figure 2 , Figure 4 is a sectional view along the "IX-IX" line of Figure 3 , Figure 5 is a plan view showing the extension scroll portion in Figure 2 , Figure 6 is a sectional view along the "X-X" line of Figure 5 , Figure 7a and Figure 7b are schematic views showing the mutual relationship between the extension scroll portion and the scroll portion accommodating groove.

[0098] Referring to Figures 2 to 6 , in the present embodiment, the fixed end plate portion 151 can have a sub bearing hole 1531 constituting a sub bearing portion 153 through which the rotating shaft 125 penetrates at the center thereof, and the fixed scroll portion 154 can extend from the periphery of the sub bearing hole 1531 toward the edge to form a mixed or non-typical shape of a substantially elliptical shape. Thus, the discharge end 154a of the fixed scroll portion 154 can be located away from the center of the fixed end plate portion 151.

[0099] The extension scroll portion 1541 described above can be formed at the discharge end 154a of the fixed scroll portion 154. In other words, the extension scroll portion 1541 can further extend from the discharge end 154a of the fixed scroll portion 154, and more specifically, from the inside corner point PI and the outside corner point P2 constituting the discharge end 154a of the fixed scroll portion 154 in the scroll portion formation direction by a predetermined length. Thus, the cross-sectional area of the fixed scroll portion 154 connected to the fixed end plate portion 151 can be enlarged and the scroll portion strength of the fixed scroll portion 154 can be increased.

[0100] The extension scroll portion 1541 can be formed at one height along the scroll formation direction of the fixed scroll portion 154, or can be formed at a plurality of heights. In the present embodiment, an example is shown in which the extension scroll portion 1541 is formed at the same height along the scroll formation direction.

[0101] For example, the extension scroll portion 1541 can be formed at the same scroll height along the scroll formation direction from the discharge end 154a of the fixed scroll portion 154, and the scroll height H12 of the extension scroll portion 1541 can be formed to be substantially 1 / 2 or less of the scroll height H11 of the fixed scroll portion 154. Thereby, it is possible to improve the scroll strength of the fixed scroll portion 154 while ensuring the scroll strength at the extension scroll portion 1541 by reducing the gas pressure received by the extension scroll portion 1541 as much as possible.

[0102] In addition, the extension scroll portion 1541 can be formed at the same scroll thickness T12 along the scroll formation direction, or can be formed at a plurality of scroll thicknesses that are continuous. In the present embodiment, an example is shown in which the scroll thickness T12 of the extension scroll portion 1541 gradually decreases along the scroll formation direction.

[0103] In other words, the extension scroll portion 1541 of the present embodiment can be formed substantially in a rectangular shape when viewed in the axial direction, and the side that is distal from the discharge end 154a of the fixed scroll portion 154 can be formed in a circular arc cross-sectional shape. Thereby, the discharge end 154a of the extension scroll portion 1541 can be formed in a curved surface and in smooth line contact with the second scroll seal surface 1426 described later, and it is possible to suppress leakage between the two compression chambers V1, V2.

[0104] In this case, the scroll thickness T12 of the extension scroll portion 1541 can be formed to be greater than or equal to the scroll length L12 of the extension scroll portion 1541. For example, the scroll thickness T12 at the portion of the extension scroll portion 1541 that is connected to the discharge end 154a of the fixed scroll portion 154 can be formed to be greater than the scroll length L12 of the extension scroll portion 1541 that extends along the scroll formation direction of the extension scroll portion 1541. Thereby, it is possible to further improve the scroll strength at the discharge end 154a of the fixed scroll portion 154.

[0105] Referring to Figures 2 to 4 In the center of the swash end plate portion 141, a rotation shaft coupling portion 143 can be formed penetratingly along the axial direction, and the swash scroll portion 142 can extend from the outer peripheral surface side of the rotation shaft coupling portion 143 in a curve corresponding to the fixed scroll portion 154 described above. Thereby, a first scroll seal surface 1421 in a circular arc shape can be formed between the discharge side end of the swash scroll portion 142 and the rotation shaft coupling portion 143 connected thereto, for the discharge end 154a of the fixed scroll portion 154 to contact.

[0106] The first scroll portion sealing surface 1421 can be formed to be in contact with the discharge end 154a of the fixed scroll portion 154. For example, the first scroll portion sealing surface 1421 can be formed in a circular arc shape, and a curvature R11 of the first scroll portion sealing surface 1421 can be formed to be smaller than a curvature R21 of the discharge end 154a of the fixed scroll portion 154. Thereby, the discharge end 154a of the fixed scroll portion 154 can be in line contact with the first scroll portion sealing surface 1421 and stably secure a radial sealing surface as the orbiting scroll 140 orbits.

[0107] In addition, a scroll portion accommodating groove 1422 recessed by a predetermined depth can be formed at an end surface of the first scroll portion sealing surface 1421, that is, at the opposite-side end of the fixed end plate portion 151. In other words, the scroll portion accommodating groove 1422 in which the extended scroll portion 1541 is inserted can be formed at the end surface of the first scroll portion sealing surface 1421. Thereby, even if the extended scroll portion 1541 extends from the discharge end 154a of the fixed scroll portion 154 in a scroll portion forming direction, leakage between the both-side compression chambers V1 and V2 can be suppressed.

[0108] The scroll portion accommodating groove 1422 can include a scroll portion support surface 1425 and a second scroll portion sealing surface 1426. The scroll portion support surface 1425 is a surface in contact with the extended scroll portion 1541 in the axial direction, and the second scroll portion sealing surface 1426 is a surface in contact with the end of the extended scroll portion 1541 in the circumferential direction. Thereby, the scroll portion accommodating groove 1422 is in contact with the extended scroll portion 1541 in the axial and circumferential directions and forms an axial sealing surface and a circumferential sealing surface, respectively.

[0109] The scroll portion support surface 1425 can extend in the circumferential direction from the end surface of the first scroll portion sealing surface 1421. For example, the scroll portion support surface 1425 can be formed flat to correspond to the end surface 1541a of the extended scroll portion 1541. Thereby, the end surface 1541a of the extended scroll portion 1541 can be supported in the axial direction by the scroll portion support surface 1425.

[0110] The scroll portion support surface 1425 can be formed in a circular arc cross-sectional shape having a width corresponding to an orbiting radius when projected in the axial direction. Thereby, the scroll portion support surface 1425 of the orbiting scroll 140 is in contact with the entire end surface 1541a of the extended scroll portion 1541 of the fixed scroll 150 in the axial direction as the orbiting scroll 140 orbits, and thus an axial sealing surface can be secured more widely.

[0111] In other words, as Figure 5 and Figure 6As shown, the scroll portion support surface 1425 can be formed in the same shape as the end surface 1541a of the extended scroll portion 1541 to be in contact with the end surface 1541a of the extended scroll portion 1541. For example, in a case where the end surface 1541a of the extended scroll portion 1541 is formed to be the same height from the fixed end plate portion 151, the scroll portion support surface 1425 can also be formed to be the same height from the orbiting end plate portion 141. Thereby, as described above, the scroll portion support surface 1425 and the end surface 1541a of the extended scroll portion 1541 can be in contact uniformly when the orbiting scroll 140 orbits, and thus an axial seal surface can be ensured widely.

[0112] The second scroll portion seal surface 1426 can extend in the axial direction from the inner side end of the scroll portion support surface 1425, in other words, from the compression direction side of the compression chamber V. The depth D12 of the second scroll portion seal surface 1426, in other words, the depth D12 of the scroll portion accommodation groove 1422 can be recessed at a depth corresponding to the scroll portion height H12 of the extended scroll portion 1541. Thereby, the end surface 1541a of the extended scroll portion 1541 can be in contact almost with the scroll portion support surface 1425, and thus an axial seal surface for the extended scroll portion 1541 can be ensured stably.

[0113] The second scroll portion seal surface 1426 can be formed to be in contact with the tip end (discharge end) of the extended scroll portion 1541. For example, the second scroll portion seal surface 1426 can be formed in a circular arc shape, and the curvature R12 of the second scroll portion seal surface 1426 can be formed to be smaller than the curvature R22 of the tip end of the extended scroll portion 1541. Thereby, the tip end of the extended scroll portion 1541 can be in line contact with the second scroll portion seal surface 1426 and a circumferential seal surface can be ensured stably when the orbiting scroll 140 orbits.

[0114] In addition, the second scroll portion seal surface 1426 can be connected between the inner side surface at the discharge end 142a of the orbiting scroll portion 142 and the outer side surface of the rotation shaft coupling portion 143 facing radially thereto, and can be formed at a position where the compression chamber V1 adjacent to the discharge port 1511 communicates with the discharge port 1511 at a discharge start angle (discharge start time point) of the compression chamber (for example, the first compression chamber) V1 in both the compression chambers V1, V2.

[0115] In other words, as Figure 7a and Figure 7bAs shown, at the time point at which the second scroll wrap sealing surface 1426 and the tip end 1541b of the extended scroll wrap 1541 are spaced apart from each other, one end of the second scroll wrap sealing surface 1426 (to be exact, the outer side surface side of the rotation shaft coupling portion) can be formed to be continuous with or axially overlap a portion of the discharge port 1511. Thus, at the instant at which the second scroll wrap sealing surface 1426 is spaced apart from the tip end 1541b of the extended scroll wrap 1541 during the orbiting motion of the orbiting scroll 140, the both-side compression chambers V1, V2 are communicated with each other, while the one-side compression chamber (e.g., the first compression chamber) V1 is communicated with the discharge port 1511. In this way, even if the both-side compression chambers V1, V2 are communicated, the refrigerant of the both-side compression chambers V1, V2 is moved to the discharge port 1511 and discharged at the same time, so that the compression loss at the both-side compression chambers V1, V2 can be suppressed. The same applies to the first scroll wrap sealing surface 1421 and the discharge end 154a of the fixed scroll wrap 154 which is in contact therewith.

[0116] In addition, the curvature R12 of the second scroll wrap sealing surface 1426 can be formed to be the same as the curvature R11 of the first scroll wrap sealing surface 1421. In other words, the discharge end 154a of the fixed scroll wrap 154 and the tip end 1541b of the extended scroll wrap 1541 can be formed to have the same curvatures R21, R22, respectively, and the first scroll wrap sealing surface 1421 and the second scroll wrap sealing surface 1426 corresponding thereto can be formed to have the same curvatures R11, R12, respectively. Thus, the discharge end 154a of the fixed scroll wrap 154 and the tip end 1541a of the extended scroll wrap 1541 can be easily machined, and the first scroll wrap sealing surface 1421 and the second scroll wrap sealing surface 1426 can be easily machined at the same time.

[0117] As described above, in the case where the extended scroll wrap 1541 is formed to extend from the discharge end 154a of the fixed scroll wrap 154, the cross-sectional area (root area) of the discharge end 154a of the fixed scroll wrap 154 can be enlarged and the scroll wrap strength of the discharge end 154a of the fixed scroll wrap 154 can be improved. This is particularly effective in the shaft-penetrating scroll compressor in which the scroll wrap length of the fixed scroll wrap 154 is short.

[0118] In other words, when the shaft passes through the scroll compressor, as the rotating shaft 125 passes through the center of the fixed end plate portion 151, the discharge port 1511 is formed eccentrically from the center of the fixed end plate portion 151. In this case, the discharge end 1541 of the fixed scroll portion 154 is far from the center of the fixed end plate portion 151. As a result, the scroll length of the fixed scroll portion 154 not only becomes shorter, but the thickness of the discharge end 154a of the fixed scroll portion 154 cannot be adequately ensured. Therefore, as shown in this embodiment, when the extended scroll portion 1541 extends from the discharge end 154a of the fixed scroll portion 154, the cross-sectional area (root area) of the fixed scroll portion 154 can be increased and the scroll strength of the discharge end 154a can be improved.

[0119] Furthermore, as shown in this embodiment, when the height H12 of the extended vortex portion 1541 is lower than the height H11 of the fixed vortex portion 154, the strength of the vortex portion relative to the fixed vortex portion 154 is increased, and the load generated by the gas pressure does not increase significantly. Therefore, the actual vortex strength of the discharge end 154a of the fixed vortex portion 154 is improved, and even under relatively high back pressure and gas pressure, damage to the discharge end 154a of the fixed vortex portion 154 can be prevented.

[0120] Furthermore, as shown in this embodiment, in a through-shaft scroll compressor, when an extended scroll portion 1541 is formed in the fixed scroll portion 154, if the compression length of the compression chamber V increases, the pressure ratio will increase. In particular, in the case of a second compression chamber V2 formed on the outer side of the fixed scroll portion 154, such as... Figure 7b As shown, as the compression length extends to the inner side of the extended scroll portion 1541, the pressure ratio of the second compression chamber V2 increases significantly, thereby improving the compressor performance.

[0121] On the other hand, another embodiment of the extended vortex section is as follows.

[0122] That is, in the above embodiments, the extended vortex portion can be formed to the same height along the vortex portion forming direction, but depending on the situation, the height of the extended vortex portion can also be formed differently along the vortex portion forming direction.

[0123] Figure 8 This is a perspective view showing another embodiment of the extended scroll portion and the scroll portion receiving groove. Figure 9 It is shown Figure 8 Top view of the extended scroll section in the middle. Figure 10 It is along Figure 9 A cross-sectional view of the "XI-XI" line. Figure 11 This is a perspective view showing yet another embodiment of the extended scroll portion and the scroll portion receiving groove. Figure 12 It is shown Figure 11a plan view of the extension scroll portion in the Figure 13 is along Figure 12 a sectional view taken along the "XII-XII" line of

[0124] Referring to Figures 8 to 10 the basic structure of the scroll compressor of the present embodiment and the effect thereof are almost the same as those of the above-described embodiment. For example, the rotating shaft 125 can penetrate and be coupled to the main frame 130, the orbiting scroll 140, and the fixed scroll 150. A sub-bearing hole 1531 can be formed at the center of the fixed scroll 150 for the rotating shaft 125 to penetrate, and a discharge port 1511 can be formed eccentrically from the center of the fixed scroll 150.

[0125] In addition, the extension scroll portion 1541 can extend along the scroll portion formation direction of the fixed scroll portion 154 at the discharge end 154a of the fixed scroll portion 154, and a scroll portion receiving groove 1422 into which the extension scroll portion 1541 is orbitably inserted can be formed between the orbiting scroll portion 142 and the rotating shaft coupling portion 143. Thereby, the cross-sectional area of the fixed scroll portion 154 can be increased by an amount corresponding to the extension scroll portion 1541, so that the scroll portion strength of the discharge end 154a of the fixed scroll portion 154 can be improved, and the pressure ratio can be improved by increasing the compression length by an amount corresponding to the scroll portion length of the extension scroll portion 1541.

[0126] Even in this case, the scroll portion height H12 of the extension scroll portion 1541 can be formed to be lower than the scroll portion height H11 of the fixed scroll portion 154, for example, to be lower than half of the scroll portion height H11. Thereby, the extension scroll portion 1541 can be formed at the discharge end 154a of the fixed scroll portion 154 and the scroll portion breakage caused by the extension scroll portion 1541 can be prevented.

[0127] However, in the present embodiment, the extension scroll portion 1541 can be formed in plural, for example, can be formed in two stages. For example, the extension scroll portion 1541 can be formed of a first extension portion 1545 and a second extension portion 1546, and the scroll portion height H12' of the first extension portion 1545 adjacent to the discharge end 154a of the fixed scroll portion 154 can be formed to be higher than the scroll portion height H12" of the second extension portion 1546 farther from the discharge end 154a of the fixed scroll portion 154. In this case, the scroll portion height H12' of the first extension portion 1545 can be formed to be greater than half of the scroll portion height H11 of the fixed scroll portion 154, and the scroll portion height H12" of the second extension portion 1546 can be formed to be less than half of the scroll portion height H11 of the fixed scroll portion 154.

[0128] This also applies to the scroll portion receiving groove 1422 facing the extended scroll portion 1541. In other words, the scroll portion support surface 1425 of the scroll portion receiving groove 1422 can be formed by a first support surface 1427 and a second support surface 1428, and the depth D12″ of the second support surface 1428 facing the second extension 1546 can be formed to be deeper than the depth D12′ of the first support surface 1427 facing the first extension 1545. Thus, the extended scroll portion 1541 can be formed in multiple stages, and the scroll portion cross section of the extended scroll portion 1541 is in close contact with the scroll portion support surface 1425 of the scroll portion receiving groove 1422 in the axial direction to form an axial sealing surface.

[0129] As described above, when the extended scroll portion 1541 is formed to gradually decrease in height from the discharge end 154a of the fixed scroll portion 154, the volume of the compression chamber V will gradually decrease. Even if the length of the extended scroll portion 1541 is relatively long, the reliability of the fixed scroll portion 154 and / or the extended scroll portion 1541 can be ensured. Therefore, the compression ratio can be further improved by extending the compression length of the compression chamber V.

[0130] Figure 11 The embodiments described above are similar in basic structure and function to those described above. Figure 8 Similar to the previous embodiment. However, in this embodiment, the extended scroll portion 1541 can be formed such that it gradually decreases in height as it moves further away from the discharge end 154a of the fixed scroll portion 154, and correspondingly, the scroll portion support surface 1425 of the scroll portion receiving groove 1422 can be formed such that it gradually decreases in height as it moves closer to the second scroll portion sealing surface 1426 from the first scroll portion sealing surface 1421. Thus, while the extended scroll portion 1541 can be formed diagonally, the scroll portion cross section of the extended scroll portion 1541 is in close contact with the scroll portion support surface 1425 of the scroll portion receiving groove 1422 in the axial direction, thereby forming an axial sealing surface.

[0131] As described above, when the extended scroll portion 1541 is formed to gradually decrease in height from the discharge end 154a of the fixed scroll portion 154, the volume of the compression chamber V gradually decreases. Therefore, even if the length of the extended scroll portion 1541 is extended further, the reliability of the fixed scroll portion 1541 and / or the extended scroll portion 1541 can be ensured. Consequently, the compression ratio can be further increased by extending the compression length of the compression chamber V further.

[0132] Additionally, in this embodiment, with Figure 2 and Figure 8 Compared to the previous embodiment, the edge at the extended scroll portion 1541 can be shortened. As a result, even if the rotating scroll 140 is slightly tilted during compressor operation, damage caused by collision between the extended scroll portion 1541 and the scroll portion receiving groove 1422 can be suppressed.

Claims

1. A scroll compressor, wherein, Comprising: a main frame fixed to the inside of the housing; a rotating shaft penetrating and supported by the main frame and provided with an eccentric portion; a revolving scroll provided with a revolving end plate portion combined with the eccentric portion of the rotating shaft, a revolving wrap portion extending from one side surface of the revolving end plate portion, and a rotating shaft combining portion formed to penetrate the center portion of the revolving end plate portion and combined with the eccentric portion of the rotating shaft; and a fixed scroll provided with a fixed end plate portion having a discharge port and a fixed wrap portion extending from the fixed end plate portion toward the revolving end plate portion and forming a compression chamber together with the revolving wrap portion at both side surfaces, respectively; a stepped extension wrap portion is formed in the fixed wrap portion, the extension wrap portion extending from a discharge end of the fixed wrap portion adjacent to the discharge port in a wrap forming direction of the fixed wrap portion, and a wrap accommodating groove is formed between the outer peripheral surface and the inner peripheral surface of the revolving wrap portion to rotatably insert the extension wrap portion into the wrap accommodating groove.

2. The scroll compressor according to claim 1, wherein a wrap height of the extension wrap portion is formed to be lower than a wrap height of the fixed wrap portion.

3. The scroll compressor according to claim 2, wherein in the extension wrap portion, at least a part of the wrap height is formed to be less than or equal to half of the wrap height of the fixed wrap portion.

4. The scroll compressor according to claim 1, wherein a wrap thickness of the extension wrap portion is formed to be less than or equal to a wrap thickness of the fixed wrap portion.

5. The scroll compressor according to claim 4, wherein the wrap thickness of the extension wrap portion is formed to be smaller in a direction away from the discharge end of the fixed wrap portion.

6. The scroll compressor according to claim 4, wherein at least a part of the wrap thickness of the extension wrap portion is formed to be greater than or equal to a wrap length of the extension wrap portion extending in the wrap forming direction.

7. The scroll compressor according to claim 1, wherein a first wrap sealing surface of a circular arc shape is formed between a discharge side end of the revolving wrap portion and the rotating shaft combining portion connected thereto to be contacted by the discharge end of the fixed wrap portion, a stepped wrap support surface is formed in the wrap accommodating groove to axially slidably support a wrap cross section of the extension wrap portion.

8. The scroll compressor according to claim 7, wherein a second wrap sealing surface is formed in the wrap accommodating groove to extend from the wrap support surface and contact the end of the extension wrap portion, the second wrap sealing surface is formed in a circular arc shape on an inner side of the wrap forming direction of the wrap support surface.

9. The scroll compressor according to claim 8, wherein a curvature of the second wrap sealing surface is formed to be the same as a curvature of the first wrap sealing surface.

10. The scroll compressor according to claim 8, wherein The tip of the extension scroll portion and the second scroll portion sealing surface of the scroll portion accommodating groove facing the tip are spaced apart from each other at a discharge start angle of at least one of the two compression chambers.

11. The scroll compressor according to claim 8, wherein The tip of the extension scroll portion and the second scroll portion sealing surface of the scroll portion accommodating groove facing the tip are formed so that the two compression chambers are spaced apart from each other in a discharge stroke.

12. The scroll compressor according to any one of claims 1 to 11, wherein The extension scroll portion is formed at the same height in a scroll formation direction of the fixed scroll portion.

13. The scroll compressor according to any one of claims 1 to 11, wherein The extension scroll portion is formed in a stepped manner at a plurality of heights in a scroll formation direction of the fixed scroll portion.

14. The scroll compressor according to any one of claims 1 to 11, wherein The extension scroll portion is formed to be lower in a scroll formation direction of the fixed scroll portion.

Images