Scroll compressor

Abstract

The present invention provides a scroll compressor comprising: a motor; a main housing in which a rotating shaft rotated by the motor is housed; a fixed scroll installed on one side of the main housing; a pivoting scroll installed between the main housing and the fixed scroll, through which the rotating shaft passes; and a main frame disposed between the main housing and the pivoting scroll, wherein the rotating shaft comprises a main shaft portion, a pivoting shaft portion connected to one end of the main shaft portion and penetrating the pivoting scroll, a fixed shaft portion connected to one end of the pivoting shaft portion and supported by the fixed scroll, and a swing bushing that surrounds the pivoting shaft portion and is disposed between the pivoting shaft portion and the pivoting scroll.

Description

Technology Field

[0001] The present invention relates to a scroll compressor, and more specifically, to a scroll compressor that sucks in and compresses a refrigerant through the revolution of a rotating scroll. Background Technology

[0002] Conventional scroll compressors consist of a fixed-radius scroll compressor in which the rotating scroll always rotates along the same trajectory regardless of changes in compression conditions, and a variable-radius scroll compressor in which the rotating scroll is arranged to retract radially to prevent damage to the wrap when liquid refrigerant, oil, or foreign matter flows into the compression chamber and the pressure inside the compression chamber rises abnormally.

[0003] Referring to FIGS. 1 and 2, methods are known in which a slide bush or a swing bush (4) is interposed between a rotation shaft (1) and a rotation scroll (14) in order to make the rotation radius of the rotation scroll (14) variable in a variable radius scroll compressor (10).

[0004] In the case of the swing bush (4), rotational movement is possible around the fixed pin (3) inserted inside the swing bush (4), and when the swing bush (4) rotates, the base circle center of the pivot scroll (14) moves in a circular motion with the fixed pin (3) as the center of rotation. When this rotational movement is clockwise, the distance between the center of the rotation axis (1) and the base circle center of the pivot scroll (14) becomes closer. The distance between the center of the rotation axis (1) and the pivot scroll (14) is the distance between the base circle of the fixed scroll (13) and the base circle of the pivot scroll (14), and becomes the radius of rotation in which the pivot scroll (14) moves in a pivotal motion around the fixed scroll (13).

[0005] Whether the rotational motion of the swing bush (4) is clockwise or counterclockwise depends on the relative magnitude of the moment in each direction created around the fixed pin (3) by the forces applied to the swing bush (4). In a normal state, it receives a moment rotating counterclockwise around the base circle center of the pivot scroll (14) and the fixed pin (3), and this rotational motion is limited by contact between the side of the pivot scroll (14) wrap and the side of the fixed scroll (13) wrap. At this time, the pivot radius is formed to be the largest, and the distance is equal to the pivot radius distance.

[0006] In the event of an abnormal high-pressure state where over-compression occurs in the compression section due to foreign substances or liquid refrigerant, the center of the pivot scroll (14) receives a moment to rotate clockwise around the fixing pin (3), and the range of this rotational movement is limited by machining the shape so that the inner boundary surface of the swing bush (4) contacts the outer diameter of the rotation axis protrusion with clearance.

[0007] The rotating shaft (1) of a conventional through-scroll compressor was manufactured as a single unit with a fixed turning radius, but recently, a rotating shaft (1) shape having a multi-stage structure for applying a radial conformation mechanism to the through-scroll compressor has been developed.

[0008] However, in the case of a shaft-through scroll compressor, the rotating shaft (1) is combined to have support in four parts, including the motor part bearing, the rotating shaft support part of the fixed scroll part (13), the slewing scroll (14), and the main frame (15). Unlike conventional scroll compressors where the swing bush (4) is applied to the end of the rotating shaft (1), the swing bush (4) must be located in the middle part of the rotating shaft (1). Accordingly, the existing radial conformation mechanism for a shaft-through scroll compressor has the problem that it must include a separate assembly process after processing the rotating shaft structure in three stages.

[0009] In this case, the rotating shaft (1) of a conventional shaft-through scroll compressor has the problem of increasing costs due to an increase in the number of parts and processing time, and has the problem of decreasing productivity because it undergoes a separate assembly process and defects may occur during the assembly process. Prior art literature

[65535] Published Patent No. 10-2024-0143137 (Date of publication: 2024.10.02) The problem to be solved

[0010] The object of the present invention is to provide an electric compressor comprising a rotating shaft having a swing bushing, which is a radial conforming mechanism, in an axially penetrating scroll compressor.

[0011] Another objective of the present invention is to provide a compressor equipped with a rotary shaft that improves machinability and assembly by forming the rotary shaft, which is conventionally structured in three stages, into an integral form. means of solving the problem

[0012] The present invention provides a scroll compressor comprising: a motor; a main housing in which a rotating shaft rotated by the motor is housed; a fixed scroll installed on one side of the main housing; a pivoting scroll installed between the main housing and the fixed scroll, through which the rotating shaft passes; and a main frame disposed between the main housing and the pivoting scroll, wherein the rotating shaft comprises a main shaft portion, a pivoting shaft portion connected to one end of the main shaft portion and penetrating the pivoting scroll, a fixed shaft portion connected to one end of the pivoting shaft portion and supported by the fixed scroll, and a swing bushing that surrounds the pivoting shaft portion and is disposed between the pivoting shaft portion and the pivoting scroll.

[0013] The above pivot shaft portion has an insertion protrusion formed protruding radially outward from the outer surface of the other side, and the above swing bushing may have an inner groove formed into which the insertion protrusion is inserted.

[0014] The above swing bushing has a bushing protrusion formed to protrude radially outward from the outer surface of the other side, and the above inner groove may be formed radially inward from the bushing protrusion.

[0015] The above pivot shaft portion is positioned eccentrically with respect to the above main shaft portion, and the above swing bushing may be positioned such that only a portion of the other end faces one end of the above main shaft portion.

[0016] The above swing bushing is formed in a cylindrical shape and can be formed such that, when viewed from one side, the thickness of the wall increases toward the central axis of the main shaft. Effects of the invention

[0017] According to the scroll compressor of the present invention, the operating performance of the device is improved by providing a swing bushing which is a radial conforming mechanism, and in particular, the machinability and assembly can be improved by forming the rotating shaft, which was conventionally designed as a three-stage structure, as an integral unit. Brief explanation of the drawing

[0018] Figure 1 is a cross-sectional view of a conventional scroll compressor. Figure 2 is a cross-sectional view of the rotation axis shown in Figure 1. FIG. 3 is a perspective view of the rotating shaft of a scroll compressor according to the present invention. Figure 4 is a cross-sectional view of Figure 3. Specific details for implementing the invention

[0019] The present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

[0020] The scroll compressor (10) according to the present invention includes a main housing (11), a fixed scroll (13), a rotating scroll (14), a main frame (15), and a cover housing (16).

[0021] The main housing (11) has an intake chamber formed therein through which refrigerant is introduced, and accommodates a motor (12) and a rotating shaft (100) inside. The rotating shaft (100) passes through the motor (12) and rotates by the motor (12).

[0022] The fixed scroll (13) is installed on one side of the main housing (11) and includes a fixed plate and a fixed wrap. The fixed plate is formed in the shape of a disc. The fixed wrap is connected to the other side of the fixed plate and is formed in a spiral shape.

[0023] The above-mentioned rotating scroll (14) is installed between the main housing (11) and the fixed scroll (13) and forms a compression chamber between it and the fixed scroll (13) where the refrigerant is compressed. The above-mentioned rotating scroll (14) includes a rotating plate, a rotating wrap, and a connecting part. The above-mentioned rotating plate is formed in the shape of a disc. The above-mentioned rotating wrap is connected to one side of the above-mentioned rotating plate, is formed in a spiral shape, and compresses the refrigerant through revolution between it and the fixed wrap. The above-mentioned connecting part is connected to the center of the above-mentioned rotating wrap, and the rotation axis (100) passes through it. The rotation axis (100) passes through the connecting part and then passes through the above-mentioned fixed plate.

[0024] The main frame (15) is positioned between the main housing (11) and the pivot scroll (14), and forms a back pressure chamber between it and the pivot scroll (14).

[0025] The cover housing (16) is coupled to one side of the main housing (11) and accommodates the fixed scroll (13), the rotating scroll (14), and the main frame (15) inside. Between the cover housing (16) and the fixed scroll (13), a discharge chamber is formed through which the refrigerant compressed in the compression chamber is discharged to the outside.

[0026] Referring to FIGS. 3 and 4, the rotational shaft (100) includes a main shaft portion (110), a pivoting shaft portion (120), a fixed shaft portion (130), and a swinging bushing (140).

[0027] The above main shaft (110) penetrates the motor (12) and the main frame (15).

[0028] The pivot shaft portion (120) is formed to protrude to one side from one end of the main shaft portion (110) and penetrates the pivot scroll (14). The pivot shaft portion (120) is positioned to be eccentric with respect to the main shaft portion (110). That is, the pivot shaft portion (120) is positioned so that its central axis is spaced apart from the central axis of the main shaft portion (110). Meanwhile, the pivot shaft portion (120) has an insertion protrusion (121) formed to protrude radially outward from the outer surface of the other side (i.e., the connection portion with the main shaft portion (110)).

[0029] The fixed shaft portion (130) is formed to protrude to one side from one end of the pivot shaft portion (120) and is supported by the fixed scroll (13). The fixed shaft portion (130) is arranged coaxially with the main shaft portion (110). That is, the fixed shaft portion (130) is arranged so that its central axis coincides with the central axis of the main shaft portion (110).

[0030] The swing bush (140) is a cylindrical member that surrounds the pivot shaft (120) and is positioned between the pivot shaft (120) and the pivot scroll (14). The swing bush (140) has an inner groove (141) formed on its inner circumference on the other side into which the insertion protrusion (121) is inserted. Additionally, the swing bush (140) has a bush protrusion (142) formed protruding radially outward from its outer circumference on the other side. The inner groove (141) is formed radially inward of the bush protrusion (142).

[0031] Since the pivot shaft portion (120) is positioned eccentrically with respect to the main shaft portion (110), the swing bush (140) is positioned such that only a portion of its other end faces one end of the main shaft portion (110), as shown in FIGS. 3 and 4. Meanwhile, the swing bush (140) can be formed in a shape in which the thickness of the wall gradually increases toward the central axis of the main shaft portion (110) when viewed from one side (i.e., with reference to FIG. 3).

[0032] When the operation of the scroll compressor (10) is normal, the base circle center of the rotating scroll (14) rotates around the rotating shaft portion (120), and this rotational movement is limited by contact between the rotating wrap side of the rotating scroll (14) and the fixed wrap side of the fixed scroll (13), thereby preventing radial leakage of the refrigerant.

[0033] When the operation of the scroll compressor (10) is in an abnormal high-pressure state, when the base circle center of the swivel scroll (14) rotates in the opposite direction around the swivel shaft portion (120), the interface of the inner groove (141) of the swing bush (140) comes into contact with the outer diameter of the insertion protrusion (121) of the swivel shaft portion (120), thereby limiting the rotation distance. Explanation of the symbols

[0034] 10: Scroll Compressor 11: Main Housing 12 : Motor 13 : Fixed scroll 14: Rotating Scroll 15: Main Frame 16 : Cover housing 100 : Rotating shaft 110: Main shaft section 120: Swivel shaft section 121 : Insertion protrusion 130 : Fixing shaft part 140 : Swing Bush 141 : Inner Home 142 : Bush protrusion

Claims

Claim 1 A main housing that accommodates a motor and a rotating shaft rotated by the motor; a fixed scroll installed on one side of the main housing; a pivoting scroll installed between the main housing and the fixed scroll, through which the rotating shaft passes; and a main frame disposed between the main housing and the pivoting scroll, wherein the rotating shaft comprises a main shaft portion, a pivoting shaft portion connected to one end of the main shaft portion and penetrating the pivoting scroll, a fixed shaft portion connected to one end of the pivoting shaft portion and supported by the fixed scroll, and a swing bushing that surrounds the pivoting shaft portion and is disposed between the pivoting shaft portion and the pivoting scroll, wherein the fixed shaft portion is positioned coaxially with the main shaft portion, and the pivoting shaft portion has an insertion protrusion formed protruding radially outward from its outer surface, and the swing bushing has an inner groove formed on its inner surface into which the insertion protrusion is inserted, and when the pivoting circle center of the pivoting scroll is oriented toward the pivoting shaft portion, the inner groove of the swing bushing A scroll compressor configured such that the boundary surface contacts the outer diameter of the insertion protrusion of the pivot shaft portion to limit the swing distance. Claim 2 delete Claim 3 In claim 1, the swing bushing has a bushing protrusion formed protruding radially outward from the outer circumference of the other side, and the inner groove is formed radially inward of the bushing protrusion, in a scroll compressor. Claim 4 A scroll compressor according to claim 1, wherein the pivot shaft portion is positioned eccentrically with respect to the main shaft portion, and the swing bushing is positioned such that only a portion of the other end faces one end of the main shaft portion. Claim 5 A scroll compressor according to claim 1, wherein the swing bushing is formed in a cylindrical shape and, when viewed from one side, is formed in a shape such that the thickness of the wall increases toward the central axis of the main shaft.

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