JP2009008101A - Compressor with built-in oil separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor with a built-in oil separator enabling productivity improvement and cost reduction, and securing degree of freedom of a delivery port position by simplifying a structure of an oil separation part. <P>SOLUTION: In a compressor with a built-in centrifugal separation type oil separator including, at least, a separation chamber separating oil component and gas component of gas containing oil led in from a delivery chamber by using centrifugal force, a communication hole between the separation chamber and the delivery chamber, and a lower part hole leading out oil separated in an oil separation chamber to an oil reservoir chamber positioned at a lower part of the separation chamber, the oil separator is formed out of a mating structure of a second member and a first member constructing a compressor, and a separation chamber is formed in a bent shape extending concentrically to a cylindrical outer circumference part of the first or the second member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor with a built-in oil separator, and more particularly, to a compressor with a built-in oil separator that simplifies and downsizes a mechanism with a built-in oil separator, reduces the number of parts, facilitates assembly, and reduces costs.

  2. Description of the Related Art Conventionally, as a compressor incorporated in a refrigeration system of a vehicle air conditioner, for example, a compressor with a built-in oil separator in which a centrifugal oil separator is built in a compressor is known (for example, Patent Document 1). In the conventional compressor with a built-in oil separator, as shown in FIG. 6, for example, a scroll type compressor provided with a compression mechanism 103 composed of a fixed spiral body 101 and a movable spiral body 102 is compressed by the compression mechanism 103. A centrifugal oil separator 107 is incorporated in a rear casing 106 that forms a discharge chamber 105 into which a gas (for example, refrigerant gas) is introduced through a discharge hole 104. In such an oil separator 107, a cylindrical cylinder (oil separation chamber 108) is provided in the casing 106 as an oil separation portion, a separation pipe 109 is inserted or press-fitted on the shaft, and the upper end side is a snap ring 110. The structure that is fixed or locked by is adopted. Since the oil separation part is installed only in the casing 106 and the oil separation part is formed by machining, the seal bolt 111 is necessary to maintain the internal pressure. Further, the discharge port 112 connected to the outside of the compressor (external piping) is communicated with a space between the upper part of the separation pipe 109 and the lower end of the seal bolt 111.

The gas compressed by the compression mechanism 103 is discharged into the discharge chamber 105 through the discharge hole 104 of the fixed spiral body, and the gas containing oil in the discharge chamber 105 is introduced into the oil separation chamber 108 through the communication hole 113. The introduced gas rotates around the separation pipe 109 and is separated into gas and oil using centrifugal force. The separated gas passes through the inside of the separation pipe 109, is discharged from the discharge port 112, and the oil separated by the centrifugal force is stored in the oil storage chamber 115 below the lower hole 114 (oil return hole). The oil accumulated in the oil storage chamber 115 is returned to the suction chamber 117 through the orifice 116.
JP-A-11-93880

The structure of the conventional oil separator as described above has the following problems.
The oil separation chamber 108 (cylinder part), the lower hole 114 (oil return hole), the insertion or press-fitting part of the separation pipe 109, the threaded part for the seal bolt 111, etc. all need to be formed by machining. Therefore, productivity is low and costs are high.

  Further, parts such as the separation pipe 109 and the seal bolt 111 are necessary, and the total length of the oil separation chamber 108 becomes relatively long, so that the workability of this part is poor. Further, since the oil separation chamber 108 (cylinder portion) has a cylindrical shape, a space for installing the oil separation portion is limited, and the overall length of the casing is also increased. Therefore, productivity is poor and layout flexibility is small.

  Moreover, since parts such as the separation pipe 109, the snap ring 110, and the seal bolt 111 are necessary and the number of parts is large, the time required for assembly is long. Further, defects are likely to occur in the press-fitting process of the separation pipe 109 and the tightening process of the seal bolt 111. For this reason, there are problems that productivity is low and costs are high in both manufacturing and assembly.

  Further, since the number of parts for the oil separator configuration is large and the structure is relatively complicated, it is difficult to make the configuration compact, and there is a limit to downsizing the oil separator component while maintaining a predetermined function.

  Further, the compressed gas after oil separation goes out of the compressor from the discharge port 112 communicating with the space between the lower end of the seal bolt 111 and the upper end of the separation pipe 109, but there is no flexibility in the layout of the separation mechanism section. Therefore, the position of the discharge port 112 is also restricted. Therefore, there is a problem that the position of the discharge port 112 is less flexible, and the design of the compressor itself and the connection structure with the outside are restricted.

  Therefore, the object of the present invention is to focus on the above-mentioned problems and simplify the structure of the oil separation part, thereby enabling improvement in productivity and cost reduction, and miniaturization of the oil separator component part. And it is providing the compressor with a built-in oil separator which ensured the design freedom of the discharge port position.

  In order to solve the above problem, an oil separator built-in compressor according to the present invention includes at least a separation chamber that separates an oil component and a gas component of an oil-containing gas introduced from a discharge chamber using centrifugal force, In a compressor having a built-in centrifugal oil separator having a communication hole between a separation chamber and a discharge chamber and a lower hole through which oil separated in the separation chamber is led to an oil storage chamber located below the separation chamber The oil separator is formed between the first member and the second member by a combined structure of a first member and a second member that constitute a compressor and has a cylindrical outer peripheral portion, and the separation chamber is formed The busbar portion is formed in a cylindrical shape curved in an arc shape so as to extend concentrically with respect to the cylindrical outer peripheral portion of the first member or the second member.

  According to the compressor with a built-in oil separator according to the present invention, the oil separator is formed by a combined structure of the first member and the second member, and the separation chamber constituting the oil separator has the busbar portion of the first or second Since it is formed in a cylindrical shape that is curved in an arc shape so as to extend concentrically with respect to the cylindrical outer peripheral portion of the second member, the outer size (the size of the cylindrical outer peripheral portion) of the first and second members is limited. Even in such a case, the curved cylindrical separation chamber is efficiently and compactly formed in a limited space within the combined structure range of both members, and an oil separator having a predetermined separation performance is obtained. It is efficiently constructed and accommodated in a limited space. As a result, it is possible to reduce the size of the oil separator component while simplifying the structure of the oil separator.

  In this invention, it is preferable that the said separation chamber is arrange | positioned in the position which cross | intersects the horizontal surface which passes along the cylindrical center line of the cylindrical outer peripheral part of the said 1st member or the 2nd member. By providing the separation chamber at such a position, the separation chamber is arranged so that the curved cylindrical shape of the separation chamber extends in a substantially vertical direction. It is possible to improve the separation efficiency from the downwardly directed oil component.

  Moreover, it is preferable that the said communicating hole is provided above the said horizontal surface. Further, when a plurality of communication holes are provided as will be described later, it is preferable that all of the communication holes are provided above the horizontal plane. Thus, by providing the communication hole at a position higher than the horizontal plane, the vertical length of the portion contributing to the oil separation action in the separation chamber is sufficiently ensured, and the oil-containing gas introduced into the separation chamber is reduced. Since the space that swirls and flows along the separation chamber wall greatly expands below the communication hole, the oil separation efficiency can be improved.

  Further, with respect to the communication hole from the discharge chamber to the separation chamber, the angle formed by the direction of the flow passing through the communication hole and the tangential upward direction of the curved cylindrical bus of the separation chamber at the opening end of the communication hole is an obtuse angle. In addition, it is preferable that a communication hole is formed. Usually, the inner wall of the separation chamber is separated into an oil component and a gas component while the oil-containing gas introduced into the separation chamber from the discharge chamber through the communication hole spirally flows along the inner wall of the separation chamber. It is formed, but if the communication hole passes through the separation chamber wall, the direction in which the oil-containing gas flows through the communication hole in the direction from the discharge chamber to the separation chamber, and the communication hole is the inner wall of the separation chamber. The oil-containing gas introduced into the separation chamber has an acute angle of 90 degrees or less with the tangential upward direction of the bus forming the cylindrical shape of the separation chamber at the opening end of the communication hole passing through A velocity component that swirls and flows along the inner wall of the separation chamber is drawn while drawing an upward spiral. Under such flow conditions, the oil component that would otherwise be expected to descend along the inner wall of the separation chamber rises along the inner wall of the separation chamber, deteriorating the oil separation efficiency of the oil separator. There is a fear. Therefore, in order to avoid the occurrence of such a flow situation, when forming the communication hole, the oil-containing gas flowing in the communication hole in the direction from the discharge chamber to the separation chamber is formed at a portion penetrating the separation chamber wall. A communication hole having an obtuse angle exceeding 90 degrees is formed between the flowing direction and the tangential upward direction of the bus forming the cylindrical shape of the separation chamber at the opening end of the communication hole through which the communication hole penetrates the inner wall of the separation chamber. Is preferred.

  The compressor with a built-in oil separator according to the present invention includes a cylinder structure (separation chamber), a communication hole portion, and a lower hole portion of an oil separation mechanism in which a first member and a second member constituting the compressor are combined. Therefore, these portions can be formed without machining, productivity is greatly improved, and cost can be reduced. In addition, the separation pipe in the conventional structure can be abolished, its fixing and locking mechanism, and also the seal bolt can be abolished, so the structure of the whole separation mechanism can be simplified and the number of parts is greatly reduced. Time can be shortened, assembly can be facilitated, and costs can be reduced. In addition, as a result of the elimination of the seal bolts and the like, the total length of the oil separation portion can be shortened and downsized, and the entire compressor can be downsized.

  Further, in the present invention, a gas passage is provided between the oil separator and a discharge port connected to the outside of the compressor, and the gas passage also includes the first member and the second member. A structure formed between the first member and the second member can be adopted by the combined structure. A discharge port may be communicated with the gas passage, whereby the gas separated from the oil is smoothly discharged from the discharge port to the outside.

  In the compressor with a built-in oil separator according to the present invention, the oil separator is basically configured as a centrifugal oil separator. However, since the number of parts is small and there is no machined portion, the degree of freedom of the shape of the separation chamber is small. Is kept extremely high. In particular, in the present invention, the separation chamber is formed in a cylindrical shape (a donut-shaped separation chamber (a shape that forms a part of the donut shape) having a curved busbar portion. The curved cylindrical shape (doughnut shape) with a curvature at the center, combined with the compact design by the concentric arrangement with the outer periphery of the cylinder, greatly increases the degree of freedom of layout, and the compressor as a whole can be made compact. become.

  Further, regarding the cross-sectional shape in the curved cylindrical shape, a substantially perfect circular shape is preferable. However, due to the configuration of the mating structure of the first member and the second member, some steps are generated on the inner surface of the cylindrical shape. Alternatively, a difference in curvature may occur between the arcs in the cylindrical cross section of the first member and the second member forming the cylindrical inner surface. Further, when forming the cylindrical inner surface, a difference in the circumferential length of the inner surface may occur between the first member and the second member. Further, there may be a difference between the depths of the arc-shaped grooves in the cylindrical cross section of the first member and the second member forming the cylindrical inner surface.

  In addition, in order to avoid a decrease in separation capacity due to the abolition of the separation pipe, by changing the blowing direction of the compressed gas blown from the communication hole to the oil separation chamber with respect to the conventional structure, Separation capability is fully feasible. For example, by adopting a structure in which the opening direction of the communication hole to the separation chamber is directed to the oil storage chamber side, the oil is introduced to the oil storage chamber side while effectively acting centrifugal force for separation on the oil. Can be efficiently separated.

  A plurality of communication holes to the separation chamber can be provided. In the case of providing a plurality, it is possible to adopt a structure in which the opening direction of the plurality of communication holes to the separation chamber is directed in the same direction. In this way, even when the amount of gas blown into the oil separation chamber is relatively large, the gas blowing through each communication hole can be optimized, and the separated oil can be efficiently guided to the oil storage chamber. Is possible. Further, a structure in which the opening direction to the separation chamber is changed for each of the plurality of communication holes can also be adopted as a preferable form. In this way, the angle of the direction of the gas blown into the oil separation chamber can be changed for each communication hole, and the gas can be blown out in accordance with the shape of the oil separation chamber, so that efficient separation can be achieved. In addition, the oil separated efficiently can be guided to the oil storage chamber.

  Further, a structure in which a stepped portion or a dam portion is provided in the gas passage may be employed. Thus, by devising the shape of the gas passage between the separation chamber and the discharge port, the outflow of oil from the discharge port can be reduced.

  Furthermore, a structure in which a second discharge chamber (a chamber immediately before the discharge port, which is different from the discharge chamber) is formed between the separation chamber and the discharge port may be employed. In such a structure, the second discharge chamber only needs to communicate with the discharge port. Therefore, by appropriately setting the formation range and the shape of the second discharge chamber, the degree of freedom of the discharge port installation position is greatly increased. Will be increased.

  Such an oil separator built-in structure in the present invention can be applied to virtually any type of compressor, but is particularly suitable for a scroll type compressor. In the case of a scroll compressor, for example, one of the first member and the second member may be a fixed spiral member and the other may be a compressor casing.

Thus, according to the compressor with a built-in oil separator according to the present invention, the first member (for example, the fixed spiral member constituting member) is formed without machining the cylinder, the communication hole, the separation pipe holding portion, the lower hole, and the like in the conventional structure. ) And a second member (for example, a casing) can be used to form an oil separator and a structure in which the separation pipe can be eliminated, and the separation chamber can be efficiently formed into a curved cylindrical shape. Since the shaped separation chamber can be efficiently accommodated in a limited space, the following effects can be obtained.
(1) It is possible to improve processing productivity and reduce costs by eliminating the machining of the oil separator.
(2) By reducing the number of parts, it is possible to reduce the cost of individual parts and to improve the assemblability.
(3) The assembly process can be greatly simplified, the separation pipe press-fitting and seal bolt tightening processes, which have become necks in the past, are eliminated, the occurrence of defects in these conventional processes is eliminated, and the defect rate in the assembly process is greatly reduced. it can.
(4) The degree of freedom of the discharge port position can be greatly increased, whereby the layout of the discharge port, and thus the layout of the entire compressor incorporated in the system can be greatly improved.
(5) Since the oil separator having a predetermined performance can be efficiently accommodated within the combined structure range of the first and second members, the entire compressor can be reduced in size while achieving the desired oil separation performance. .

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a cross section of a portion including a discharge chamber 2 of a compressor 1 with a built-in oil separator according to an embodiment of the present invention. The compressor 1 is composed of, for example, a scroll compressor including a compression mechanism 103 including a fixed spiral body 101 and a movable spiral body 102 as shown in FIG. Gas (for example, refrigerant gas) compressed by the compression mechanism 103 is introduced into the discharge chamber 2 via the discharge hole 104 (see FIG. 6).

  An oil separator 3 is built in an appropriate position around the discharge chamber 2. As shown in FIGS. 2 and 3, the oil separator 3 is formed by a combined structure of a fixed spiral member 4 as a first member and a casing 5 as a second member. The oil separator 3 has a separation chamber 6 having a cylinder structure that separates oil from compressed gas by centrifugal force. In this embodiment, the separation chamber 6 has a cylindrical shape with a curved busbar (one donut shape). In the example shown in FIG. 1, the separation chamber 6 having a curved cylindrical shape extends concentrically with respect to the cylindrical outer peripheral portion 18 of the fixed spiral member constituting member 4. Is formed. A communication hole 7 is provided between the separation chamber 6 and the discharge chamber 2 to blow out gas containing oil from the discharge chamber 2 into the separation chamber 6. In the present embodiment, a plurality of (two) communication holes 7 are provided. Is provided. As shown in FIG. 2, oil-containing gas (arrow) is introduced into the separation chamber 6 from the communication hole 7 at a position eccentric from the cylindrical central axis of the separation chamber 6, and along the inner surface of the separation chamber 6. A flow is formed and the oil in the gas is separated by centrifugal force. As shown in FIG. 4, the two communication holes 7 have an opening direction toward the separation chamber 6 directed toward the oil storage chamber 8 formed below the separation chamber 6. In the embodiment shown in FIG. 1, As shown in FIG. 4B, the opening direction to the separation chamber 6, that is, the angle of the extending direction of the communication hole 7 is changed for each communication hole 7. The angle is set so that the communication hole 7 located on the lower side faces the oil storage chamber 8 side. When a plurality of communication holes 7 are provided in this way, as shown in FIG. 4A, the opening directions of the respective communication holes 7 to the separation chamber 6 are directed in the same direction, and the opening directions of all the communication holes 7 are set to the same direction. It can also be aligned in the optimal direction. The separated oil is stored in the oil storage chamber 8 through a lower hole 9 provided at the lower end of the separation chamber 6. As shown in FIG. 3, the lower hole 9 is formed at a position eccentric from the center of the cylindrical shape of the separation chamber 6. The oil stored in the oil storage chamber 8 is returned to the suction chamber side through the orifice 10.

  The gas separated in the separation chamber 6 is discharged from the discharge port 12 to the outside of the compressor through the gas passage 11 communicated with the upper end of the separation chamber 6. In this embodiment, as shown in FIG. 5, a step portion 13 (or a weir portion) is provided in the gas passage 11, and due to the presence of the step portion 13, the flow in the gas passage 11 is bent, Oil is prevented from flowing out from the discharge port 12 to the outside.

  Furthermore, in this embodiment, a second discharge chamber 14 that is completely separate from the discharge chamber 2 is formed between the separation chamber 6 and the discharge port 12 (in the present embodiment, at a position after the step portion 13). ing. The discharge port 12 communicates with the second discharge chamber 14, but the second discharge chamber 14 is formed in a chamber having a length in the circumferential direction of the compressor as shown in FIG. The installable position can be freely set within the range corresponding to the extension range of the second discharge chamber 14 (discharge port range 15).

  In the compressor 1 with a built-in oil separator composed of the scroll compressor configured as described above, the separation chamber 6, the lower hole 9, and the communication hole 7 are particularly formed by a combined structure of the fixed spiral member 4 and the casing 5. Thus, it can be formed simply by assembling the fixed spiral member 4 and the casing 5 together. That is, since the fixed spiral member 4 and the oil separator forming portion of the casing 5 can be cast, machining of the cylinder portion or the like in the conventional structure is not required at all. In addition, the separation pipe and seal bolt in the conventional structure are not necessary, and the number of parts is greatly reduced. As a result, assembly is facilitated, assembly time is shortened, assembly defects are significantly reduced, and productivity can be greatly improved and costs can be reduced.

  Further, in response to the concern about the decrease in oil separation capability due to the abolition of the conventional separation pipe, the oil blowing chamber 8 is blown downward from one or a plurality of communication holes 7 to the oil storage chamber 8 side. It becomes easy to introduce oil (in the conventional oil separation structure, the oil is blown out in a direction perpendicular to the axial direction of the separation chamber), and more efficient separation is possible by changing the angle for each communication hole 7. .

  Further, as the shape of the separation chamber 6, the doughnut-shaped cylindrical shape as in the present embodiment increases the degree of freedom of arrangement and shape of the separation chamber 6 and greatly increases the degree of freedom of its layout. At the same time, the compressor 1 can be made compact as a whole. As described above, the circular cross-sectional shape of the cylindrical shape does not have to be a complete circle as necessary. Further, the role of forming the circular cross-sectional shape between the first and second members is different. There may be.

  Further, by providing the step portion 13 in the gas passage 11 after passing through the oil separation chamber 6, the amount of oil flowing out from the discharge port 12 to the external circuit side can be greatly reduced. Furthermore, by providing the second discharge chamber 14 after passing through the separation chamber 6, the degree of freedom of the installation position of the discharge port 12 can be greatly increased.

  FIG. 7 is a cross-sectional view of a portion including a discharge chamber of a compressor incorporated with an oil separator according to another embodiment of the present invention. In the compressor 1 with a built-in oil separator in FIG. 1, the oil separator efficiency of the oil separator has been considerably improved. However, the compressor 1 with a built-in oil separator in FIG. 7 can further improve the oil separation efficiency. ing.

  That is, the lower communication hole 7 in FIG. 1 is provided below a horizontal plane including the center line of the cylindrical body of the fixed spiral member 4 and the casing 5, whereas in FIG. These communication holes 7 are provided above the horizontal plane. In addition to this, in FIG. 7, as in FIG. 1, the fixed spiral body constituting member 4 and the casing 5 are each formed in a substantially cylindrical shape, and the separation chamber 6 is curved in a circular arc at the busbar portion. The circular arc shape and the substantially cylindrical shape as the outer shape of the fixed spiral member 4 and the casing 5 are formed concentrically. Further, the separation chamber 6 is provided at a position that is substantially divided into two vertically by a horizontal plane including a center line common to the substantially cylindrical shape (that is, extending so as to intersect the horizontal plane). In FIGS. 1 and 7, the upper and lower communication holes 7 both have a direction 16 through which the communication hole 7 penetrates the separation chamber 6 (that is, the flow direction passing through the communication hole 7), and the communication hole 7. Is formed so that the angle θ formed with the tangential upward direction 17 of the bus of the separation chamber 6 at the opening end of the communication hole penetrating the inner wall of the separation chamber 6 is an obtuse angle. In both FIG. 1 and FIG. 7, the directions 16 and 17 are displayed only for the upper communication hole 7.

  The structure of the compressor with a built-in oil separator according to the present invention can be applied to any type of compressor with a built-in oil separator, and is particularly suitable for a scroll type compressor.

It is a cross-sectional view of the site | part containing the discharge chamber of the compressor with a built-in oil separator which concerns on one embodiment of this invention. It is a fragmentary sectional view (cross-sectional view of an oil separator crossing direction) of the oil separator part of the compressor of FIG. It is a fragmentary sectional view of the lower hole part of the oil separator lower end of the compressor of FIG. It is a fragmentary sectional view (cross section of an oil separator longitudinal direction) which shows the example of a section shape ((A) and (B)) of an oil separator part of the compressor of Drawing 1. It is a fragmentary sectional view of the gas passage part of the compressor of Drawing 1. It is a partial longitudinal cross-sectional view of the conventional oil separator built-in compressor. It is a cross-sectional view of the site | part containing the discharge chamber of the compressor with a built-in oil separator which concerns on the other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor with built-in oil separator 2 Discharge chamber 3 Oil separator 4 Fixed spiral structure member 5 as first member 5 Casing 6 as second member Separation chamber 7 Communication hole 8 Oil storage chamber 9 Lower hole 10 Orifice 11 Gas passage 12 Discharge port 13 Step (or weir)
14 Second discharge chamber 15 Discharge port range 16 Through-hole direction of communication hole 17 Tangent upward direction of busbar 18 Cylindrical outer peripheral portion

Claims (10)

  At least a separation chamber that separates the oil component and gas component of the oil-containing gas introduced from the discharge chamber using centrifugal force, a communication hole between the separation chamber and the discharge chamber, and a position below the separation chamber In the compressor having a centrifugal oil separator having a lower hole for leading the oil separated in the separation chamber to the oil storage chamber, the oil separator constitutes a compressor and has a cylindrical outer peripheral portion. The separation structure is formed between the first member and the second member by a combined structure of the member and the second member, and the bus bar portion is formed on the cylindrical outer peripheral portion of the first member or the second member. An oil separator built-in compressor characterized in that it is formed in a cylindrical shape curved in an arc shape so as to extend concentrically.   The compressor with a built-in oil separator according to claim 1, wherein the separation chamber is disposed at a position intersecting a horizontal plane passing through a cylindrical center line of a cylindrical outer peripheral portion of the first member or the second member.   A gas passage is provided between the oil separator and a discharge port connected to the outside of the compressor, and the gas passage is also formed by the first member and the second member. The compressor with a built-in oil separator according to claim 1, wherein the compressor is formed between the member and the second member.   The compressor with a built-in oil separator according to claim 3, wherein a stepped portion or a weir portion is provided in the gas passage.   The compressor with a built-in oil separator according to claim 3 or 4, wherein a second discharge chamber is formed between the separation chamber and the discharge port.   The oil separator built-in compressor according to any one of claims 1 to 5, wherein an opening direction of the communication hole to the separation chamber is directed to the oil storage chamber side.   The compressor with a built-in oil separator according to any one of claims 1 to 6, wherein a plurality of the communication holes are provided.   The compressor with a built-in oil separator according to claim 7, wherein opening directions of the plurality of communication holes to the separation chamber are directed in the same direction.   The compressor with a built-in oil separator according to claim 7, wherein an opening direction to the separation chamber is changed for each communication hole.   The oil separator according to any one of claims 1 to 9, comprising a scroll compressor, wherein one of the first member and the second member comprises a fixed spiral member, and the other comprises a compressor casing. Built-in compressor.

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