JP2010043567A - Manufacturing method of autorotation-prevention joint of scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost autorotation-prevention joint of a scroll compressor by significantly reducing cutting portions and dramatically increasing a using rate of aluminum alloy. <P>SOLUTION: A pipe material having protrusions 62 and 63 in inner and outer peripheral parts, respectively, is formed by extrusion of aluminum alloy, and a ring member 60 is formed by cutting the pipe member in a predetermined thickness. A press machine includes a female mold 70 and a male mold 71, and the female mold 70 has a through-hole which is slightly smaller than an outer periphery of the ring member 60 and the male mold 71 is slightly larger than an inner periphery. A method of manufacturing the autorotation-prevention joint of the scroll compressor includes installing the ring member 60 onto one side of the female mold 70, press-fitting the male mold 71 from the other side of the ring member 60, and casting fitting protrusions 32 and 33 on both sides of the ring member 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an anti-rotation joint. More specifically, the present invention relates to a method for manufacturing a rotation-preventing joint of a scroll compressor suitable as a refrigerant compressor for refrigeration and air conditioning, and an air or other gas compressor.

The principle of operation of the scroll compressor, the structure of the anti-rotation joint used in the scroll compressor, and the principle of operation are well known.
The scroll compressor is composed of a fixed scroll in which spiral wraps are engaged with each other, a turning scroll, and a rotation prevention joint for preventing the rotation of the turning scroll, and the air supplied from the supply port when the turning sucrose rotates. It is a compressor that compresses and discharges.
In addition, the orbiting scroll prevents the orbiting scroll from rotating by sliding the rotation preventing joint, and accurately transmits the rotation of the main shaft to the orbiting scroll through the rotation preventing joint.
In order to improve the sliding characteristics of such an anti-rotation joint, it has been proposed that the sliding portion of the anti-rotation joint that slides with swivel sucrose is subjected to a rubrite treatment and a nitronitriding treatment (for example, Patent Document 1).
In addition, to improve the workability of the anti-rotation joint and reduce the vibration during use of the scroll compressor caused by the vibration of the anti-rotation joint, after using aluminum alloy as the material and forming the pipe material by forging A manufacturing method has been proposed in which a pipe material is cut to form a predetermined anti-rotation joint (for example, Patent Document 2).
JP 58-174101 A Japanese Unexamined Patent Publication No. 1-211680

However, in the conventional method for manufacturing an anti-rotation joint, an aluminum alloy is first made into a pipe material by forging, then the pipe material is cut to a predetermined thickness, and then cut into a predetermined shape to manufacture an anti-rotation joint. It was.
Therefore, when manufacturing anti-rotation joints having fitting projections on the upper and lower surfaces of the annular member, many aluminum alloys must be removed by cutting, the utilization rate of the aluminum alloys is poor, and the anti-rotation joints are expensive. It was.

  Therefore, in the method of manufacturing the anti-rotation joint of the present invention, the pipe material cut to a predetermined thickness is made into an anti-rotation joint of a predetermined shape by drawing, thereby greatly reducing the cutting portion, and the aluminum alloy This makes it possible to drastically increase the utilization rate and to provide an inexpensive anti-rotation joint.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention according to claim 1 is to form a pipe material having protrusions on the inner and outer peripheral parts by extrusion of an aluminum alloy,
The pipe material is cut into a predetermined thickness to form a ring material,
In a press apparatus having a female mold having a through hole slightly smaller than the outer peripheral edge of the ring material and a male mold slightly larger than the inner peripheral edge,
In the manufacturing method of the anti-rotation joint of the scroll compressor, in which the ring material is installed on one side of the female die, the male die is pushed in from the other side of the ring material, and fitting projections are formed on both sides of the ring material. is there.

(Function and effect)
By using an aluminum alloy, the anti-rotation joint that is the final product can be reduced in weight, and vibration during use of the scroll compressor due to vibration of the anti-rotation joint can be reduced.
By extruding an aluminum alloy having excellent ductility and molding the pipe material, the projections can be molded on the inner and outer circumferences of the pipe material corresponding to the fitting projections of the anti-rotation joint that is the final product.

  A ring material obtained by cutting a pipe material to a predetermined thickness is a pressing device having a female die having a through hole slightly smaller than the outer peripheral edge of the ring material and a male die slightly larger than the inner peripheral edge. Installed on one side, pushing the male die from the other side of the ring material, and molding fitting projections on both sides of the ring material, greatly reducing the cutting area and dramatically increasing the utilization rate of aluminum alloy An inexpensive anti-rotation joint can be provided.

<Invention of Claim 2>
The invention according to claim 2 is the method for manufacturing the anti-rotation joint of the scroll compressor according to claim 1, characterized in that the fitting protrusions on both surfaces of the ring material are ground.

(Function and effect)
By grinding the mating projections on both sides of the ring material, the shape and dimensional accuracy of the mating projections on both sides of the ring material are further increased, and the fitting with the orbiting scroll of the scroll compressor and the fitting groove formed in the frame is improved. Can be made suitable.

  ADVANTAGE OF THE INVENTION According to this invention, a cutting part is reduced significantly, the utilization factor of an aluminum alloy is improved greatly, and the provision of the rotation prevention joint of an inexpensive scroll compressor is attained.

  First, after describing a scroll compressor, an embodiment of the present invention will be described.

(Scroll compressor)
FIG. 1 is a partial cross-sectional view of a scroll compressor, FIG. 2 is a perspective view of a rotation prevention joint 30 of a first form manufactured by the manufacturing method of the present invention, and FIG. 3 is a rotation of a first form. 2 is an external view of a prevention joint 30. FIG.
As shown in FIG. 1, the compression unit 15 of the scroll compressor includes a fixed scroll 10, an orbiting scroll 20, a rotation prevention joint 30, a frame 40, and a rotating shaft 50 that transmits rotation from an electric unit (not shown). It is composed of

  The fixed scroll 10 discharges compressed gas and the like from the sealed chamber 11, a spiral wrap 12 extending downward from the platform 11, a suction port 13 for sucking gas and the like into the sealed chamber, and the like. And a discharge port 14.

The orbiting scroll 20 includes a base plate 21, a spiral wrap 22 extending upward from the base plate 21, and a boss 23 extending downward from the base plate 21.
The spiral wrap 22 of the orbiting scroll 20 meshes with the spiral wrap 12 of the fixed scroll 10 to form a sealed chamber.
A bearing 24 is attached to the inner peripheral portion of the boss 23, and a fitting groove 25 is formed on the lower surface of the base plate 21 at a position opposite to an upper surface fitting protrusion 32 of a rotation preventing joint 30 described later. .

The rotary shaft 50 is fitted with the frame 40, and the crank pin 51 at the tip of the rotary shaft 50 is inserted into the bearing 24 of the orbiting scroll 20.
The rotation of the rotary shaft 50 is transmitted to the frame 40, and a fitting groove 41 is formed on the upper surface side of the frame 40 at a position opposite to a lower surface fitting protrusion 33 of a rotation preventing joint 30 described later.
The fitting groove 25 formed in the orbiting scroll 20 and the fitting groove 41 formed in the frame 40 are formed at intervals of 90 degrees.

As shown in FIGS. 2 and 3, the anti-rotation joint 30 includes a circumferential portion 31, an upper surface fitting projection 32 on the upper side surface of the circumferential portion 31, and a lower surface fitting projection 33 on the lower side surface of the circumferential portion 31. Have
The automatic prevention joints 30 are respectively fitted to the orbiting scroll 20 and the frame 40 to prevent the orbiting scroll 20 from rotating relative to the fixed scroll 10 and to reliably transmit the rotation of the rotary shaft 50 to the orbiting scroll 20 via the frame 40.
That is, the upper surface fitting protrusion 32 of the rotation preventing joint 30 is fitted in the fitting groove 25 of the orbiting scroll 20, and the lower surface fitting protrusion 33 of the rotation preventing joint 30 is fitted in the fitting groove 41 of the frame 40. Thus, when the rotary shaft 50 is not rotating, the orbiting scroll 20 is prevented from rotating, and when the rotary shaft 50 is rotating, the rotating shaft 50 is reliably rotated. The orbiting scroll 20 can be rotated.

  The gas or the like sucked into the sealed chamber from the suction port 13 is compressed at the center of the sealed chamber as the orbiting scroll 20 rotates (turns), and the compressed gas or the like is discharged from the discharge port 14 to the outside of the sealed chamber. Discharged.

(Embodiment of the present invention)
FIG. 4 is an external view of the ring material 60 of the first form before the drawing of the rotation preventing joint 30 of the first form, and FIG. 5 is a schematic diagram of the drawing process.

  The manufacturing method of the anti-rotation joint of the scroll compressor according to the present invention includes a step of forming a pipe material by extrusion, a step of cutting the obtained pipe material into a predetermined length to form a ring material, and A ring material is made into a rotation preventing joint by drawing.

(Extrusion process)
An aluminum alloy is used as a base material in order to reduce vibration during use of the scroll compressor due to generation of vibration of the anti-rotation joint 30.
First, the aluminum alloy is heated and extruded into a die to form a long pipe material having the front view shown in FIG.

(Cutting process)
The long pipe material is cut into a predetermined length to form the ring material 60.
As shown in FIG. 4, the ring member 60 has an inner peripheral protrusion on the inner peripheral surface of the ring part 61 formed on the ring part 61 and the upper surface fitting protrusion 32 on the upper side surface of the circumferential part 31 of the anti-rotation joint 30. 62, and an outer peripheral protrusion 63 on the outer peripheral surface of the ring portion 61 formed on the lower surface fitting protrusion 33 on the lower surface of the circumferential portion 31 of the anti-rotation joint 30.
Here, the width dimension of the ring portion 61 is formed to be approximately 145 to 155% with respect to the width dimension of the circumferential portion 31 of the anti-rotation joint 30 in consideration of a reduction in the width dimension generated during the drawing process. Preferably, the thickness dimension of the ring portion 61 is about 65 to 70% with respect to the thickness dimension of the circumferential portion 31 of the anti-rotation joint 30 in consideration of an increase in the thickness dimension generated during drawing. Is preferred.
The width dimensions of the inner and outer peripheral protrusions 62 and 63 are formed to be about 102 to 105% with respect to the width of the fitting protrusions 32 and 33 of the anti-rotation joint 30 in consideration of the dimensions ground by grinding performed after the drawing process. Preferably, the projection length dimension of the inner and outer peripheral projections 62 and 63 is the height dimension of the fitting projections 32 and 33 of the anti-rotation joint 30, and therefore the height of the fitting projections 32 and 33 of the anti-rotation joint 30. It is preferable that the length is approximately the same as the dimension.
As shown in FIG.

(Drawing process)
As shown in FIG. 5, the ring material 60 is installed in the female die 70, and the male die 71 is pushed in from above to form the automatic prevention joint 30. In FIG. 5, the upper surface side of the ring material 60 is installed in the female die 70.
The dimensional difference between the inner diameter dimension of the female mold 70 and the outer diameter dimension of the male mold 71 (sometimes referred to as dimensional tolerance) is set to twice the width dimension of the automatic prevention joint 30, and the female mold 70 of the ring material 60 is set. The center of the ring part 61 of the ring material 60, the center of the female mold 70, and the center of the male mold 71 are installed in a straight line.
When the area of the inner peripheral vicinity portion 64 of the ring portion 61 and the area of the outer peripheral vicinity portion 65 of the ring portion 61 are the same area, the pressure applied to the inner peripheral vicinity portion 64 and the pressure applied to the outer peripheral vicinity portion 65 are equalized. This is preferable.
Further, by making the total area of the area of the inner peripheral vicinity 64 and the area of the outer peripheral vicinity 65 to be about 45 to 55% of the area of the ring portion 61, local elongation or the like is suppressed during drawing. The anti-rotation joint 30 with high shape and dimensional accuracy can be molded, which is preferable.
In addition, the inner periphery vicinity part 64 of the ring part 61 refers to the overlap part of the ring part 61 and the male type | mold 71, and the outer periphery vicinity part 65 of the ring part 61 is the overlap part of the ring part 61 and the female type | mold 70. Say.

For simplicity, the dimensional difference between the outer peripheral edge of the ring portion 61 and the inner peripheral edge of the female die 70 and the dimensional difference between the inner peripheral edge of the ring portion 61 and the outer peripheral edge of the male die 71 are the same dimensional difference, If the dimensional difference between the peripheral edge and the inner peripheral edge of the female die 70 and the dimensional difference between the inner peripheral edge of the ring portion 61 and the outer peripheral edge of the male die 71 are respectively set to about 23 to 27% with respect to the width dimension of the ring portion 61, The pressure applied to the peripheral vicinity portion 64 and the pressure applied to the peripheral vicinity portion 65 can be made equal to each other, and the anti-rotation joint 30 with high shape and dimensional accuracy is formed by suppressing local elongation during drawing. Can do.
Although not shown in the drawing, a male type in which the outer periphery of the male type 71 is rounded, and a male type in which an arc shape is attached to the pushing surface of the male type 71 are localized during the drawing process. It is more suitable for forming the anti-rotation joint 30 with high shape and dimensional accuracy while suppressing elongation and the like.

As described above, when the ring material 60 is installed in the female die 70 and the male die 71 is pushed in from above, the ring material 60 is successively squeezed downward from the inside of the ring material 60, and the rotation prevention joint 30 of the final product is rotated. Molding is complete.
That is, when the male die 71 is pushed in from above, first, the inner peripheral protrusion 62 on the inner peripheral surface of the ring portion 61 is squeezed downward, and the inner peripheral vicinity 64 of the ring portion 61 of the ring member 60 is a male type. The fitting protrusion 32 is formed on the upper side surface (corresponding to the lower side surface of FIG. 5) of the ring portion 61.
Furthermore, when the male die 71 is pushed in, the ring portion 61 is first squeezed downward, and then the outer peripheral vicinity 65 of the ring portion 61 of the ring material 60 is squeezed downward, and the circumferential portion 31 is Molded.
Further, when the ring portion 61 is pushed in, the outer peripheral protrusion 63 on the outer peripheral surface is squeezed upward, and the fitting protrusion 33 is molded on the lower side of the ring 61 (corresponding to the upper side in FIG. 5). Molding of the anti-rotation joint 30 that is the final product is completed.

By further grinding the width-direction opposed surfaces of the fitting protrusions 32, 33 of the formed automatic prevention joint 30, the dimensional accuracy of the fitting protrusions 32, 33 is further improved and refined, and the anti-rotation joint The vibration during use of the scroll compressor due to the vibration can be further reduced.
Although not shown in FIG. 5, when the thickness dimension of the ring material 60 is small, the ring material 60 is sandwiched between the wrinkle-reducing mold and the female mold to be generated on the ring material 60 during the drawing process. Wrinkles can be suppressed.

FIG. 6 is a perspective view of a second form anti-rotation joint 35 manufactured by the manufacturing method of the present invention, and FIG. 7 shows a second form ring material before drawing of the second form anti-rotation joint 35. 66 is an external view of 66. FIG.
The anti-rotation joint 35 of the second embodiment of the present invention further includes an upper surface convex portion 36 on the upper surface of the circumferential portion 31 of the anti-rotation joint 30 of the first embodiment in order to reduce the sliding resistance with the orbiting scroll 20. This is an anti-rotation joint.
The ring member 66 used for manufacturing the anti-rotation joint 35 of the second embodiment of the present invention has an outer peripheral protrusion 67 on the outer peripheral surface of the ring portion 61 formed on the upper protrusion 36 of the anti-rotation joint 35 of the second embodiment. Other than having, it is the same as that of the ring material 60 of the 1st form.
Since the manufacturing method of the rotation prevention joint 35 of the 2nd form of this invention is the same as the manufacturing method of the rotation prevention joint of a 1st form, description is abbreviate | omitted.

FIG. 8 is a perspective view of the third form anti-rotation joint 37 manufactured by the manufacturing method of the present invention, and FIG. 9 shows the third form ring material before drawing of the third form anti-rotation joint 37. FIG.
An anti-rotation joint 37 according to the third embodiment of the present invention includes an upper surface convex portion 36 on the upper surface of the circumferential portion 31 of the anti-rotation joint 30 according to the first embodiment, and a frame to reduce sliding resistance with the orbiting scroll 20. The anti-rotation joint further includes a lower surface convex portion 38 on the lower surface of the circumferential portion 31 of the anti-rotation joint 30 in order to reduce sliding resistance.
The ring material 68 used for manufacturing the anti-rotation joint 37 of the third embodiment of the present invention has an outer peripheral convex portion 67 on the outer peripheral surface of the ring portion 68 molded into the upper surface convex portion 36 of the anti-rotation joint 37 of the third embodiment. The ring member 68 is the same as the ring member 60 of the first embodiment, except that the inner peripheral convex portion 69 is provided on the inner peripheral surface of the ring portion 68 that is formed on the lower surface convex portion 38 of the anti-rotation joint 37 of the third embodiment.
Since the manufacturing method of the rotation prevention joint 37 of the 3rd form of this invention is the same as the manufacturing method of the rotation prevention joint of a 1st form, description is abbreviate | omitted.

It is a fragmentary sectional view of a scroll compressor. It is a perspective view of the rotation prevention joint of the 1st form manufactured by the manufacturing method of the present invention. It is a rotation prevention joint of a 1st form, (a) is the same front view, (b) is the same side view. It is a ring material of a 1st form, (a) is a front view, (b) is a side view. It is an external view of the drawing process of the present invention. It is a perspective view of the rotation prevention joint of the 2nd form manufactured by the manufacturing method of the present invention. It is a ring material of the 2nd form, (a) is the front view, and (b) is the side view. It is a perspective view of the rotation prevention joint of the 3rd form manufactured by the manufacturing method of the present invention. It is a ring material of a 3rd form, (a) is the front view, and (b) is the side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Fixed scroll, 11 ... Base plate, 12 ... Lap, 13 ... Inlet port, 14 ... Discharge port, 15 ... Compression part, 20 ... Orbiting scroll, 21 ... Base plate, 22 ... Wrap, 23 ... Boss, 24 ... Bearing , 25 ... fitting groove, 30 ... anti-rotation joint (first form), 31 ... circumferential part, 32 ... upper face fitting protrusion, 33 ... lower face fitting protrusion, 35 ... anti-rotation joint (second form), 36 ... upper surface convex part, 37 ... anti-rotation joint (third form), 38 ... lower surface convex part, 40 ... frame, 41 ... fitting groove, 50 ... rotating shaft, 51 ... crank pin, 60 ... ring material (first form) ), 61 ... Ring part, 62 ... Inner peripheral protrusion, 63 ... Outer peripheral protrusion, 64 ... Inner peripheral part, 65 ... Outer peripheral part, 66 ... Ring material (second form), 67 ... Outer peripheral convex part, male type, 68 ... Ring material (third form), 69 ... Inner peripheral projection, 70 ... Female type, 71 ... Male type

Claims (2)

By extruding aluminum alloy, pipe materials each having protrusions on the inner and outer peripheral parts are formed,
The pipe material is cut into a predetermined thickness to form a ring material,
In a press apparatus having a female mold having a through hole slightly smaller than the outer peripheral edge of the ring material and a male mold slightly larger than the inner peripheral edge,
A method for manufacturing an anti-rotation joint for a scroll compressor, wherein the ring member is installed on one side of the female die, the male die is pushed in from the other side of the ring member, and fitting protrusions are formed on both sides of the ring member.   The method for manufacturing a rotation-preventing joint for a scroll compressor according to claim 1, wherein the fitting protrusions on both sides of the ring material are ground.

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