Slide bush and compressor having slide bush

Abstract

The present invention can prevent damage caused by the concentration of stress at a specific portion occurring during the coupling of a slide bush to a balance weight. To this end, a curved surface portion and a flat surface portion are formed on the inner circumferential surface of the slide bush provided in the compressor of the present invention, and a stress relief portion for relieving stress is provided at a connection portion between the curved surface portion and the flat surface portion.

Description

A compressor having a slide bush and a slide bush

[0001] The present invention relates to a slide bushing provided at a coupling portion between a rotating shaft and a pivoting scroll, and a compressor having the same.

[0002] Generally, a compressor is a device or apparatus used for generating high pressure or transporting high-pressure fluids. Among these compressors, those applied to refrigeration cycles, such as those in refrigerators or air conditioners, perform the function of compressing refrigerant gas and transferring it to the condenser.

[0003] Among the compressors mentioned above, the scroll compressor is a type of compressor in which the rotating scroll among two scrolls installed facing each other rotates around the fixed scroll, and the compression chamber created between the wraps of each scroll gradually narrows to compress the refrigerant.

[0004] The pivot scroll of such a scroll compressor is installed eccentrically on the rotation axis and pivots around the axis center of the rotation axis.

[0005] In addition, a slide bush is provided at the joint between the rotation axis and the pivot scroll.

[0006] Meanwhile, if the weight of the aforementioned rotating scroll becomes heavy or the driving speed is high, the wrap of the rotating scroll may be damaged by the centrifugal force of the rotating scroll, or the power consumption may increase due to friction with the fixed scroll.

[0007] Accordingly, conventionally, a balance weight is provided to adjust rotational imbalance in the slide bushing. In this regard, various methods are provided, such as Registered Patent No. 10-0147097, Published Patent No. 10-2021-0019640, Published Patent No. 10-2021-0108764, and Published Patent No. 10-2010-0123689.

[0008] The above balance weight is formed as an injection-molded metal product and is integrated with the above slide bushing through mutual connection to be managed as a single product.

[0009] Conventionally, in order to integrate the balance weight and the slide bushing, the slide bushing was press-fitted into the balance weight to achieve integration. That is, the slide bushing was forcibly inserted into the insertion hole formed in the balance weight to form a single unit.

[0010] During the process of pressing the slide bushing into the balance weight in this manner, there was a problem in which stress was concentrated in specific parts of the coupling hole formed on the inner circumference of the slide bushing. In particular, since the slide bushing is formed from a sintered body, there was a problem in which damage, such as cracking or deformation, occurred in the area where the stress was concentrated.

[0011] To prevent the aforementioned problem, it was unavoidable to increase the thickness of the slide bushing (thickness in the radial direction).

[0012] However, increasing the thickness of the slide bushing has the problem that the diameter of the rotation shaft becomes relatively smaller, which inevitably weakens the rigidity of the rotation shaft.

[0013] The present invention was devised to solve various problems according to the aforementioned prior art.

[0014] The objective of the present invention is to prevent damage or breakage caused during the process of pressing the slide bush into the balance weight.

[0015] Another objective of the present invention is to prevent stress concentration at specific parts of the slide bushing without reducing the diameter of the rotation axis.

[0016] Another objective of the present invention is to provide a slide bushing that is compatible with the rotating shaft of an existing compressor.

[0017] According to the compressor of the present invention for achieving the above objective, it comprises: a first scroll; a second scroll engaged with the first scroll and rotated by a rotation axis; and a slide bush provided at the coupling portion between the rotation axis and the second scroll.

[0018] According to the compressor of the present invention, the slide bushing can be pressed into a balance weight that provides centrifugal force. By means of such a slide bushing and balance weight, damage to the lap during abnormal operation of the second scroll and excessive eccentric rotation of the second scroll can be prevented.

[0019] According to the compressor of the present invention, at least a portion of the inner circumferential surface of the slide bush is formed as a flat surface and at least a portion is formed as a curved surface. This inner circumferential structure of the slide bush prevents lap damage to each scroll.

[0020] According to the compressor of the present invention, the inner surface of the slide bushing can be defined as a flat portion formed as a flat surface, a curved portion formed as a curved surface, and a connecting portion where the flat portion and the curved portion meet.

[0021] According to the compressor of the present invention, a stress relief portion is formed on the inner surface of a slide bushing to relieve stress concentration. By providing such a stress relief portion, stress concentrated on a part of the inner surface of the slide bushing can be relieved or alleviated.

[0022] According to the compressor of the present invention, a stress relief member may be provided at the connection portion where a flat portion and a curved portion of the inner circumferential surface of a slide bushing meet. Stress at the connection portion can be reduced by this stress relief member.

[0023] According to the compressor of the present invention, a plurality of connection parts are provided, and a stress relief part may be formed at least one of the plurality of connection parts. Stress on at least one of the plurality of connection parts may be relieved by this stress relief part.

[0024] According to the compressor of the present invention, the stress relief portion is formed to be recessed from the surface of the flat portion of the inner circumferential surface of the slide bush. Stress on the connection portion can be relieved by the shape of this stress relief portion.

[0025] According to the compressor of the present invention, the stress relief portion is formed to be recessed from the surface of the curved portion of the inner circumferential surface of the slide bushing. Stress on the connection portion can be relieved by the shape of this stress relief portion.

[0026] According to the compressor of the present invention, the stress relief portion is formed to be recessed from the surfaces of the flat and curved portions among the inner circumferential surfaces of the slide bushing. Stress on the connection portion can be relieved by the shape of this stress relief portion.

[0027] According to the compressor of the present invention, two or more stress relief portions may be provided on the inner surface of a slide bush. This prevents stress from being applied simultaneously to multiple portions of the inner surface of the slide bush.

[0028] According to the compressor of the present invention, the stress relief portion is formed as an arc surface having a radius of a first length. Stress on the connection portion can be relieved by the shape of this stress relief portion.

[0029] According to the compressor of the present invention, the first length is determined to be shorter than the thickness between the outer surface and the inner surface of the slide bush. Due to this definition of the first length, the problem of reduced reliability of the slide bush due to the stress relief portion being excessively recessed from the surface of the flat or curved portion can be prevented.

[0030] According to the compressor of the present invention, the center of the arc surface provided as a stress relief section is positioned so as to be spaced apart from the surface of the flat section by a second length. By defining this second length, the problem of stress concentration occurring at the end of the stress relief section can be reduced.

[0031] According to the compressor of the present invention, the second length is determined to be shorter than the thickness between the inner and outer surfaces of the slide bushing. By defining this second length, a minimum thickness of the connection portion can be secured.

[0032] According to the compressor of the present invention, the first length can be determined to be longer than the second length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0033] According to the compressor of the present invention, the center of the arc surface provided as a stress relief section is positioned so as to be spaced apart from the surface of the curved section by a third length. By defining this third length, the problem of stress concentration occurring at the end of the stress relief section can be reduced.

[0034] According to the compressor of the present invention, the third length is determined to be shorter than the thickness between the inner and outer surfaces of the slide bushing. By defining this third length, a minimum thickness of the connection portion can be secured.

[0035] According to the compressor of the present invention, the first length can be determined to be longer than the third length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0036] According to the compressor of the present invention, the center of a circle forming an arc surface provided as a stress relief part is positioned such that it is spaced apart by a second length from the surface of a flat part and spaced apart by a third length from the surface of a curved part. Due to the spacing between the center of the arc surface and each surface of the inner circumference of the slide bush, the contact surface between the inner surface of the slide bush and the rotation axis can be maximized.

[0037] According to the compressor of the present invention, the second length and the third length are determined to be shorter than the thickness between the inner and outer surfaces of the slide bush. By defining these second and third lengths, the stress relief portion can be formed to the maximum size.

[0038] According to the compressor of the present invention, the first length is determined to be longer than the second or third length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0039] According to the compressor of the present invention, the second length is determined to be longer than the third length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0040] According to the slide bushing of the present invention for achieving the above-mentioned purpose, a flat portion and a curved portion are formed on the inner circumferential surface, and a stress relief portion is formed at the connection portion where the flat portion and the curved portion meet, such that the stress relief portion is formed to be recessed from the surface of at least one of the flat portion or the curved portion. Stress on the connection portion can be relieved by this stress relief portion.

[0041] According to the slide bushing of the present invention, the stress relief portion is formed as an arc surface having a radius of a first length. Due to the shape of this stress relief portion, stress can be dispersed rather than concentrated in a specific area.

[0042] According to the slide bushing of the present invention, the center of a circle forming an arc surface can be positioned such that it is spaced a second length from the surface of a flat portion and a third length from the surface of a curved portion. By positioning the center of the circle forming the arc surface in this way, the contact surface between the inner circumferential surface of the slide bushing and the rotation axis can be maximized.

[0043] According to the slide bush of the present invention, the first length is determined to be longer than the second or third length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0044] According to the slide bush of the present invention, the second length is determined to be longer than the third length. By defining the relationship between these two lengths, stress at the stress concentration site can be relieved without reducing the durability of the slide bush.

[0045] As described above, the slide bush of the present invention provides the following effects.

[0046] In the slide bushing of the present invention, the phenomenon of stress concentration at a specific part of the inner surface of the slide bushing can be prevented or minimized during the process of pressing it into the balance weight.

[0047] In the slide bushing of the present invention, stress generation at the connection point between the curved or flat portions of the inner circumference can be prevented or minimized.

[0048] The slide bush of the present invention can be applied to existing compressors because the diameter of the eccentric pin forming the compressor does not need to be reduced even when a stress relief part is formed.

[0049] Since the slide bush of the present invention does not involve structural changes to the eccentric pin forming the compressor, it is possible to prevent the rigidity of the eccentric pin from weakening.

[0050] The slide bush of the present invention can minimize deformation of the flat portion by forming the stress relief portion deeper in the curved portion than in the flat portion.

[0051] The slide bush of the present invention can minimize or prevent functional degradation caused by structural changes in the planar portion.

[0052] FIG. 1 is an internal cross-sectional view of a compressor of an embodiment of the present invention.

[0053] FIG. 2 is a cross-sectional view of the key parts regarding the relationship between the second scroll, the rotating shaft, the slide bushing, and the balance weight constituting the compressor of an embodiment of the present invention.

[0054] FIG. 3 is a perspective view of the relationship between the slide bush and the balance weight of an embodiment of the present invention.

[0055] FIG. 4 is an exploded perspective view of the relationship between the slide bush and the balance weight of an embodiment of the present invention.

[0056] FIG. 5 is a plan view of a slide bushing coupled to a balance weight of an embodiment of the present invention.

[0057] FIG. 6 is a cross-sectional view of a slide bushing coupled to a balance weight of an embodiment of the present invention.

[0058] FIG. 7 is an exploded view of the balance weight and slide bushing of an embodiment of the present invention.

[0059] FIG. 8 is a perspective view of a slide bushing of an embodiment of the present invention.

[0060] FIG. 9 is a plan view of a slide bushing of an embodiment of the present invention.

[0061] Fig. 10 is an enlarged view of section “A” in Fig. 9.

[0062] FIGS. 11 to 14 are enlarged views illustrating the relationship between the inner circumferential surface of a slide bushing and a stress relief portion according to an embodiment of the present invention.

[0063] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0064] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0065] The compressor of the present invention is designed to prevent damage caused by stress concentration in a specific area during the process of integrating a slide bushing (400), which is provided to vary the turning radius during the operation of the turning side scroll, with a balance weight (500). To this end, the compressor of the present invention is provided with a structure to relieve stress in the area where the stress concentration occurs.

[0066] A preferred embodiment of the compressor of the present invention will be described in more detail for each component with reference to the attached FIGS. 1 to 14 as follows.

[0067] As illustrated in FIG. 1, the compressor of the embodiment of the present invention has a case (100). The case (100) can be defined as the exterior of the compressor.

[0068] The above case (100) can be formed to have an internal space partitioned from the external environment.

[0069] As shown in FIG. 1, the compressor of the embodiment of the present invention has a compression section (200) and a transmission section (300).

[0070] The above compression unit (200) is defined as a part or assembly that compresses the refrigerant, and the above electric unit (300) may be defined as a part or assembly that provides driving force to the compression unit (200) to compress the refrigerant.

[0071] The above compression unit (200) and the electric motor unit (300) may each be provided in the internal space of the case (100). For example, the compression unit (200) may be placed in the upper space within the case (100), and the electric motor unit (300) may be placed in the lower space within the case (100).

[0072] The above-mentioned electric motor (300) includes a rotor (310) and a stator (320). The rotor (310) rotates a rotation axis (330) that is located inside the stator (320) and passes through its center.

[0073] The above-mentioned rotating shaft (330) can be defined as a conventional crank shaft, and the upper end of the above-mentioned rotating shaft (330) is connected to the above-mentioned compression part (200).

[0074] The above compression unit (200) includes a first scroll (210) and a second scroll (220).

[0075] The first scroll (210) and the second scroll (220) are positioned facing each other. For example, the first scroll (210) is positioned on the upper side and the second scroll (220) is positioned on the lower side of the first scroll (210).

[0076] Each of the above-mentioned scrolls (210, 220) is provided with a respective wrap (211, 221) on the opposing surface between them. For example, a first wrap (211) is provided on the bottom surface of the first scroll (210), and a second wrap (221) is provided on the top surface of the second scroll (220). The first wrap (211) and the second wrap (221) interlock with each other to form at least one compression chamber. Each of the above-mentioned wraps (211, 221) may be formed in a spiral shape.

[0077] The compression space of the above compression chamber can be varied by the rotational movement of the second wrap (221). For example, the compression space of the compression chamber is gradually reduced by the rotational movement of the second wrap (221), thereby compressing the refrigerant inside the compression chamber.

[0078] At least one of the first scroll (210) and the second scroll (220) can be installed to pivot relative to the other scroll.

[0079] For example, the first scroll (210) may not rotate, and only the second scroll (220) may rotate.

[0080] The first scroll (210) may be fixedly installed within the case (100). The fixation may be defined as a state in which rotation or pivoting in the circumferential direction is prevented. For example, the first scroll (210) may be installed to move in a direction opposite to (up and down) the second scroll (220), or the first scroll (210) may be installed to move radially from the axis center.

[0081] The second scroll (220) may be installed to pivot relative to the first scroll (210). To this end, the axis center of the rotation axis (330) is installed to be concentric with the center of the first scroll (210), and the center of the second scroll (220) is installed to be eccentric from the axis center of the rotation axis (330).

[0082] As shown in FIG. 2, an eccentric pin (331) is formed at the top of the rotation axis (330) and is eccentric from the axis center of the rotation axis (330), and a boss (222) is formed at the bottom of the second scroll (220) to receive the eccentric pin (331).

[0083] As shown in FIG. 2, the compressor of the embodiment of the present invention has a slide bush (400).

[0084] The above slide bush (400) rotates around the axis center of the rotation shaft (330) together with the eccentric pin (331) of the rotation shaft (330) during normal operation of the scroll compressor, so that the wraps (211, 221) of the two scrolls (210, 220) are in close contact with each other, and when the scroll compressor stops, the wraps (211, 221) of the two scrolls (210, 220) are separated from each other.

[0085] As illustrated in FIGS. 3 to 8, the slide bush (400) may be formed as a cylindrical bush. For example, the slide bush (400) may be formed as a bush having an outer surface and an inner surface. The outer surface and the inner surface of the slide bush (400) may be formed as concentric circles. Although not illustrated, the slide bush (400) may be formed such that the outer surface and the inner surface do not form concentric circles with respect to each other. For example, the outer surface of the slide bush (400) may be formed eccentrically with respect to the center of the inner surface.

[0086] As shown in FIG. 2, the slide bush (400) is provided at the connection point between the rotation shaft (330) and the second scroll (220). For example, the eccentric pin (331) of the rotation shaft (330) is inserted into the inner surface of the slide bush (400), and the outer surface of the slide bush (400) is inserted into the inner surface of the boss (222) formed on the bottom surface of the second scroll (220).

[0087] As shown in FIGS. 8 to 10, a flat portion (420) may be formed on at least a portion of the inner surface of the slide bush (400). The flat portion (420) may be defined as a portion formed as a flat plane. That is, the inner surface of the slide bush (400) may be formed with a curved portion (410) formed as a circular surface and a flat portion (420) formed as a flat plane. The curved portion (410) may be the remaining portion other than the flat portion (420).

[0088] The above-mentioned flat portion (420) can act as a contact surface that contacts the eccentric pin (331) of the rotation shaft (330) to transmit power. In addition, the flat portion (420) acts to cause the second scroll (220) to slide in the radial direction of the rotation shaft (330) when abnormal compression of the compressor occurs. This prevents damage by separating the wraps (211, 221) of each scroll (210, 220) from each other when abnormal compression of the compressor occurs.

[0089] The flat portion (420) has a connection portion with the curved portion (410). That is, one end of the flat portion (420) and one end of the curved portion (410) are connected to each other at the connection portion. Two or more such connection portions may be provided. Although not illustrated, the connection portion may be provided at only one location.

[0090] Meanwhile, for a large-capacity compressor, the turning radius of the second scroll (220) is inevitably increased, and as a result, the centrifugal force also increases, which can cause the impact force applied to the slide bush (400) to become more severe.

[0091] Accordingly, some types of compressors may additionally be provided with a balance weight (500) to counteract the centrifugal force of the second scroll (220). That is, the centrifugal force provided to the slide bush (400) is relieved by enabling the balance weight (500) to provide centrifugal force in a direction opposite to the direction in which the centrifugal force of the second scroll (220) is applied.

[0092] This balance weight (500) can be formed to be integral with the slide bush (400). For example, the slide bush (400) can be pressed into the balance weight (500) to form an integral part with it.

[0093] However, considering that the slide bush (400) is made of a sintered body, there is a risk of damage during the process of pressing it into the balance weight (500). Furthermore, there is a high risk of damage to the area where the flat portion (420) and the curved portion (410) of the inner circumference of the slide bush (400) are connected, as stress is concentrated at the connection point.

[0094] In the case of the above-mentioned flat portion (420), since it forms a contact surface with the eccentric pin (331), if it is damaged due to stress concentration, a problem may occur in the sliding operation of the rotation axis (330), and thereby the wrap (211, 221) may be damaged.

[0095] In consideration of this, the slide bushing (400) is further provided with a stress relief member (430) to relieve the stress concentration. That is, by providing the stress relief member (430), the stress concentration at the connection part is relieved, thereby preventing problems caused by the stress concentration.

[0096] As shown in FIGS. 8 to 10, the stress relief portion (430) may be formed in at least one of the plurality of connection portions. For example, the stress relief portion (430) may be formed in only one of the two connection portions or in both connection portions. This makes it possible to reduce the stress concentration phenomenon at the connection portions.

[0097] The stress relief portion (430) may be recessed from at least one of the flat portion (420) or the curved portion (410) of the connection portion. For example, the stress relief portion (430) may be recessed from the flat portion (420) of the connection portion, or the stress relief portion (430) may be recessed from the curved portion (410) of the connection portion.

[0098] Preferably, the stress relief portion (430) may be recessed from both the flat portion (420) and the curved portion (410) of the connection portion.

[0099] Additionally, the stress relief portion (430) may be formed to be recessed from the surface of at least one of the flat portion (420) or the curved portion (410).

[0100] For example, the stress relief portion (430) may be formed to be recessed from the surface of the flat portion (420) or recessed from the surface of the curved portion (410). Preferably, the stress relief portion (430) may be formed to be recessed from the surfaces of both the flat portion (420) and the curved portion (410).

[0101] Conventionally, the thickness from the boundary (corner) of the connection part to the outer surface of the nearest slide bush (400) is rounded to be formed thicker, thereby preventing the concentration of stress or reducing the occurrence of damage even if stress is concentrated.

[0102] However, this structure has the disadvantage that as the thickness of the connection part increases, the diameter of the eccentric pin (331) of the rotation axis (330) decreases, and the rigidity of the eccentric pin (331) decreases accordingly.

[0103] Considering this, forming the stress relief portion (430) so as to be recessed from the surface of the flat portion (420) or the curved portion (410), as in the embodiment of the present invention, is advantageous in that it prevents the rigidity of the eccentric pin (331) from weakening while also preventing damage to the slide bushing (400) due to stress concentration.

[0104] In particular, if the slide bush (400) is formed such that the thickness of the above-mentioned connection part is increased, the diameter of the eccentric pin (331) of the rotation shaft (330) must be changed, which has the disadvantage that the slide bush (400) cannot be used in existing compressors or the rotation shaft (330) must also be replaced. However, the slide bush (400) according to the structure of the embodiment of the present invention has the advantage that it can be applied without replacing the rotation shaft (330) of an existing compressor because there is no need to change the shape of the eccentric pin (331).

[0105] Meanwhile, as shown in FIG. 11, the stress relief portion (430) may be formed as an arc surface. That is, the stress relief portion (430) may be formed as an arc surface having a radius of curvature of a first length (L1) from an arbitrary circle center (C). By forming the stress relief portion (430) as an arc surface in this way, stress can be dispersed rather than concentrated at a specific part of the stress relief portion.

[0106] The radius (first length) (L1) of the stress relief portion (430) may be formed to be shorter than the wall thickness (thickness between the outer surface and the inner surface) (T) (see FIG. 9) of the slide bush (400). This structure is designed to prevent the stress relief portion (430) from being excessively recessed from the surface of the flat portion (420) or the curved portion (410). In other words, if the stress relief portion (430) is formed to be recessed from the surface of the connection part with an excessive depth, it may cause a problem where the reliability of the slide bush (400) is reduced. Considering this, it is most desirable to have the first length (L1) have a depth (a length shorter than the wall thickness) that does not reduce the reliability of the slide bush (400).

[0107] Additionally, as shown in FIG. 12, the center of the circle (the center of the circle forming the arc) (C) of the stress relief part (430) can be positioned so as to be spaced apart from the surface of the planar part (420) by a second length (L2). That is, the center of the circle (C) is sufficiently spaced apart from the planar part (420) within the slide bush (400) by a second length (L2) so that the boundary (edge) between the stress relief part (430) and the planar part (420) forms a slope (or round) as gentle as possible. This reduces the problem of stress concentration at the boundary.

[0108] In addition, the second length (L2) can be determined to be shorter than the wall thickness (T) of the slide bush (400). With this structure, a minimum wall thickness (T) of the connection part can be secured.

[0109] The second length (L2) may be determined to be shorter than the first length (L1). This allows a stress relief portion (430) having an arc surface to be formed in the connection portion between the flat portion (420) and the curved portion (410). That is, the stress relief portion (430) formed in the connection portion allows stress to be relieved at the stress concentration area without reducing the durability of the slide bush (400).

[0110] Additionally, as illustrated in FIG. 13, the center of the circle (the center of the circle forming the arc) (C) of the arc surface (stress relief part) can be positioned so as to be spaced apart from the surface of the curved part (410) by a third length (L3). That is, by ensuring that the center of the circle (C) is sufficiently spaced apart from the curved part (410) within the slide bushing (400) by a third length (L3), the boundary between the stress relief part (430) and the curved part (410) is made to have the gentlest possible slope. This prevents the problem of stress being concentrated at the boundary.

[0111] In addition, the third length (L3) can be determined to be shorter than the thickness between the inner and outer surfaces of the slide bush (400). This structure ensures that a minimum wall thickness of the connection portion can be secured.

[0112] Due to the definition of this third length (L3), the problem of the reliability of the slide bush (400) being reduced by the stress relief portion (430) being excessively recessed from the surface of the flat portion (420) or the curved portion (410) can be prevented. That is, the reduction in reliability that may be caused by the excessive reduction in the wall thickness of the slide bush (400) can be prevented.

[0113] The third length (L3) can be determined to be shorter than the first length (L1). This allows a stress relief portion (430) having an arc surface to be formed in the connection portion between the flat portion (420) and the curved portion (410). That is, the stress relief portion (430) formed in the connection portion allows stress to be relieved at the stress concentration area without reducing the durability of the slide bushing (400).

[0114] Preferably, as illustrated in FIG. 14, the center (C) of the circle forming the arc surface provided as the stress relief part (430) is positioned such that it is spaced by a second length (L2) in a vertical direction from the surface of the flat part (420) and spaced by a third length (L3) in a tangential direction from the surface of the curved part (410). That is, by spaced the center (C) of the circle from the flat part (420) within the slide bush (400) by a second length and spaced the center (C) of the circle from the curved part (410) within the slide bush (400) by a third length (L3), the boundary between the stress relief part (430), the flat part (420), and the curved part (410) can be formed with the gentlest possible slope. This prevents the problem of stress concentration at the boundary.

[0115] The above second length (L2) and third length (L3) are determined to be shorter than the wall thickness (T) between the inner and outer surfaces of the slide bush (400). This prevents the problem of the reliability of the slide bush (400) being reduced by the stress relief portion (430) being excessively recessed from the surfaces of the flat portion (420) and the curved portion (410).

[0116] The first length (L1) is determined to be longer than the second length (L2) and longer than the third length (L3). Due to this first length (L1), an arc surface of the stress relief part (430) can be formed to prevent stress concentration at the connection point, and due to the second length (L2) and the third length (L3), problems such as reduced durability of the slide bush (400) and stress concentration at the boundary between both ends of the stress relief part (430) and the flat part (420) and the curved part (410) can be prevented.

[0117] In addition, the second length (L2) is determined to be longer than the third length (L3). That is, the distance from the center of the circle (C) to the planar portion (420) (vertical distance) is formed to be further than the distance from the center of the circle (C) to the curved portion (410) (tangential distance). This ensures that the contact area with the eccentric pin (331) by the planar portion (420) is maximized, while preventing stress concentration in that area.

[0118] Meanwhile, the balance weight (500) of the compressor according to the embodiment of the present invention has a ring portion (510) in which a press-fit hole (501) is formed so that the slide bush (400) is pressed in.

[0119] In addition, the balance weight (500) has a protrusion (520) that protrudes in a direction opposite to the direction in which the centrifugal force of the second scroll (220) acts with respect to the axis center of the ring portion (510).

[0120] A gripping projection (530) is formed at the boundary between the ring portion (510) and the protrusion (520) to wrap around a portion of the outer surface of the boss (222) formed on the second scroll (220). This prevents the second scroll (220) from tilting while rotating.

[0121] As described above, the compressor of the present invention has a stress relief portion (430) formed in the slide bush (400). Accordingly, stress concentration occurring in a specific part of the inner surface during the process of pressing the slide bush (400) into the balance weight (500) can be prevented.

[0122] In addition, the stress relief portion (430) formed in the slide bush (400) of the present invention is formed to be rounded by being recessed from the connection portion between the curved portion (410) and the flat portion (420). Accordingly, there is no need to change the structure of the eccentric pin (331). That is, since the diameter of the eccentric pin (331) does not need to be reduced, it has the advantage of being applicable to existing compressors.

[0123] In addition, the compressor of the present invention has the advantage of preventing damage to the slide bush (400) due to stress concentration while preventing the rigidity of the eccentric pin (331) from weakening because there is no structural change to the eccentric pin (331).

[0124] In addition, the compressor of the present invention minimizes deformation of the flat section (420) by forming the stress relief section (430) more deeply in the curved section (410) than in the flat section (420). This has the advantage of minimizing or preventing functional degradation caused by structural changes in the flat section (420).

[0125] Meanwhile, the compressor of the present invention can be implemented in various forms different from the aforementioned embodiments.

[0126] As an example, although not illustrated, the stress relief portion (430) of the slide bush (400) forming the compressor of the present invention may be formed only on one of the plurality of connection portions formed on the inner circumference of the slide bush (400).

[0127] For example, depending on the method of pressing the slide bush (400) into the balance weight (500), greater stress may be applied to only one of the connection parts. Taking this into consideration, a stress relief part (430) may be formed at the connection part where a relatively greater stress concentration occurs among the connection parts. Due to this structure, the area where the wall thickness of the slide bush (400) is reduced can be minimized.

[0128] As another example, the stress relief portion (430) of the slide bush (400) forming the compressor of the present invention may be formed in different shapes for each of the multiple connection portions.

[0129] For example, in the aforementioned embodiment of the present invention, it is presented that each connection part is formed as an arc surface with the same radius of curvature (first length). However, although not illustrated, each stress relief part (430) provided to each connection part may be formed as an arc surface having different radii of curvature. That is, the radius of curvature of the stress relief part (430) provided to one connection part may be larger than the radius of curvature of the stress relief part (430) provided to another connection part. Due to this structure, uniform stress concentration relief is possible even if the magnitude of the stress provided to each connection part is different.

[0130] As another example, the slide bush (400) forming the compressor of the present invention is not limited to being applied only to the compressor.

[0131] For example, the structure of the slide bush of the present invention can be applied to various types of bushes for power transmission.

[0132] That is, a slide bush (400) may be provided alone, having a flat surface portion (420) and a curved surface portion (410) formed on the inner surface, and a stress relief portion (430) formed to be more recessed than the surface of at least one of the flat surface portion (420) or the curved surface portion (410) at the connection portion where the flat surface portion (420) and the curved surface portion (410) meet.

[0133] Here, the stress relief portion (430) of the slide bush (400) may be formed as an arc surface having a radius of a first length (L1). The center (C) of the circle forming the arc surface may be positioned so as to be spaced apart by a second length (L2) from the surface of the flat portion (420) and spaced apart by a third length (L3) from the surface of the curved portion (410).

[0134] Additionally, the stress relief portion (430) of the slide bush (400) may be determined such that the first length (L1) is longer than the second length (L2) or the third length (L3).

[0135] Additionally, the stress relief portion (430) of the slide bush (400) may be determined such that the second length (L2) is longer than the third length (L3).

[0136] As such, the compressor or slide bush of the present invention can be implemented in various forms.

[0137] In the foregoing, although all components constituting an embodiment according to the present invention have been described as being combined or operating in combination, the present invention is not necessarily limited to such embodiments. That is, within the scope of the purpose of the present invention, all such components may be selectively combined in one or more ways to operate. Furthermore, terms such as "include," "constitute," or "have" described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Terms commonly used, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in the present invention, should not be interpreted in an ideal or overly formal sense.

[0138] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A first scroll having a first wrap; A second scroll having a second lap that engages with the first lap; A rotating shaft having an eccentric pin to pivot the second scroll relative to the first scroll; A slide bushing provided between the above-mentioned eccentric pin and the second scroll; It includes a balance weight that provides centrifugal force during the rotational movement of the second scroll and is pressed into the slide bushing; The inner surface of the above slide bushing is formed with a curved portion formed as a curved surface and a flat portion formed as a flat surface, and A compressor having a stress relief portion formed at the connection portion where the flat portion and the curved portion meet, which is recessed from the surface of at least one of the flat portion or the curved portion.

2. In Paragraph 1, The above connection parts are two or more, and The stress relief member is a compressor formed at least one of the plurality of connection parts.

3. In Paragraph 1, A compressor in which the stress relief portion is recessed compared to the flat portion and recessed compared to the curved portion.

4. In Paragraph 1, The above stress relief part is a compressor formed as an arc surface having a radius of a first length.

5. In Paragraph 4, A compressor in which the first length is determined to be shorter than the thickness between the outer surface and the inner surface of the slide bush.

6. In Paragraph 4, A compressor in which the center of the circle forming the arc surface is positioned so as to be spaced apart from the surface of the planar portion by a second length.

7. In Paragraph 6, A compressor in which the second length is determined to be shorter than the thickness between the inner and outer surfaces of the slide bush.

8. In Paragraph 6, A compressor in which the first length is determined to be longer than the second length.

9. In Paragraph 4, A compressor in which the center of the circle forming the arc surface is positioned so as to be spaced apart from the surface of the curved portion by a third length.

10. In Paragraph 9, A compressor in which the above third length is determined to be a length shorter than the thickness between the inner and outer surfaces of the slide bush.

11. In Paragraph 9, A compressor in which the first length is determined to be longer than the third length.

12. In Paragraph 4, The center of the circle forming the above arc surface is, A compressor positioned such that it is spaced apart by a second length from the surface of the flat portion and spaced apart by a third length from the surface of the curved portion.

13. In Paragraph 12, A compressor in which the second and third lengths are determined to be shorter than the thickness between the inner and outer surfaces of the slide bush.

14. In Paragraph 12, A compressor in which the first length is determined to be longer than the second or third length.

15. In Paragraph 12, A compressor in which the second length is determined to be longer than the third length.

16. A flat surface and a curved surface are formed on the inner surface, and A slide bushing having a stress relief portion formed at the connection portion where the flat portion and the curved portion meet, which is recessed from the surface of at least one of the flat portion or the curved portion.

17. In Paragraph 16, The above stress relief portion is a slide bushing formed as an arc surface having a radius of a first length.

18. In Paragraph 17, The center of the circle forming the above arc surface is, A slide bushing positioned so as to be spaced apart by a second length from the surface of the flat portion and spaced apart by a third length from the surface of the curved portion.

19. In Paragraph 18, A slide bush in which the first length is determined to be longer than the second or third length.

20. In Paragraph 18, A slide bush in which the second length is determined to be longer than the third length.

Images