JP5492811B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor having an Oldham coupling as an orbiting scroll rotation prevention mechanism.

  First, the scroll compressor will be described with reference to FIG. FIG. 6 is a cross-sectional view of the compression mechanism portion of the scroll compressor.

  In FIG. 6, 11 is a fixed scroll, 11a is a lap, 11b is a discharge port, 12 is a turning scroll, 12a is a wrap, 12b is a bearing portion, 12c is a key groove, 13 is a frame, 13a is a bearing portion, and 13b is a key groove. Reference numeral 1 denotes an Oldham ring, 4 denotes a key, 15 denotes a crankshaft, 15a denotes an eccentric portion, 16 denotes a bolt, 17 denotes a sealing case, and 18 denotes a suction pipe.

  In the scroll compressor of FIG. 6, the crankshaft 15 is inserted into the bearing portion 13 a of the frame 13, and the eccentric portion 15 a of the crankshaft 15 is inserted into the bearing portion 12 b provided on the orbiting scroll 12. The key 4 of the Oldham ring 1 forming the Oldham coupling is inserted into the key groove 13 b provided in the frame 13 and the key groove 12 c provided in the orbiting scroll 12, and the fixed scroll 11 is combined with the orbiting scroll 12. In the state, it is fastened to the frame 13 by bolts 16.

  With the configuration described above, the orbiting scroll 12 orbits with respect to the fixed scroll through the eccentric portion 15a of the crankshaft by the rotational motion applied to the crankshaft 15 by the motor 14 fastened to the crankshaft 15. By this orbiting motion, the vortex-shaped wrap 11a of the fixed scroll 11 and the vortex-shaped wrap 12a of the orbiting scroll move relative to each other, and the gas is sucked through the suction pipe 18 provided in the fixed scroll 11, and the center portion As the process proceeds, the gas is compressed. The compressed gas is discharged from the discharge port 11b of the fixed scroll. With the above configuration, the scroll compressor shown in FIG. 6 functions as a compressor.

  The Oldham ring 1 has an Oldham joint structure in which the keys 4 provided on both the front and back surfaces are inserted into the keyway 12c of the orbiting scroll 12 and the keyway 13b of the frame 13. With this Oldham joint structure, the orbiting scroll 12 can perform the orbiting movement with respect to the fixed scroll 11 without rotating.

  An example of the Oldham ring will be described with reference to FIGS.

  FIG. 7 is a perspective view of the Oldham ring, and FIG. 8 is a DD cross section of FIG. (D'-D 'cross section is also the same) 1 is an Oldham ring, 2 is a ring, 3 is an end face, 4 is a key, 4a is a key side face, 3 is an end face, 4e is an intersection of the key side face 4a and the end face 3, 12d Is chamfering of the key groove of the orbiting scroll.

  The end surface 3 of the Oldham ring 1 shown in FIG. 7 is a contact surface with the orbiting scroll 12 (frame 13) to be combined, but the intersection line 4e with the key side surface 4a is also on the same plane of the end surface 3. Here, since the key 4 is combined with the key groove 12 c of the orbiting scroll 12 (key groove 13 b of the frame 13), the key side surface 4 a needs to be flat to the vicinity of the intersection line 4 e with the end surface 3. In order to make the key width W more accurate, it is difficult to process the key side surface 4a and the end surface 3 at the same time, and the key side surface 4a and the end surface 3 are processed separately. That is, the intersection line 4e has to be processed into a sharp corner shape as much as possible.

  Patent Documents 1 and 2 are known as examples of processing this intersection line.

  Patent Document 1 is a scroll compressor that employs an Oldham ring made of sintered metal as an anti-rotation mechanism for orbiting scrolls. By forming the sintered metal into a shape suitable for subsequent cutting and grinding processes. It is an object of the present invention to provide an inexpensive and highly reliable scroll compressor while improving productivity and adopting a sintered metal having excellent wear resistance but poor machinability.

  Further, Patent Document 2 provides an Oldham ring structure with excellent durability against the use of a light weight aluminum aluminum joint. Here, in order to make an Oldham coupling aluminum, it is disclosed that the base of the ring portion and the key upper protrusion is rounded.

JP-A-11-236885 JP-A-2-61381

  In the above-described prior art, it is necessary to control the accuracy of the remaining processing of the intersection portion. In addition, in order to prevent interference between the processing residue of the intersecting line portion and the key groove of the orbiting scroll, the key groove portion of the orbiting scroll is chamfered, and this accuracy control is also required.

  Therefore, it has been desired that this accuracy management is unnecessary and that the structure has high reliability.

  It is an object of the present invention to obtain a scroll compressor having high reliability at the intersection of the Oldham ring key side surface and the end face of the annular member.

In order to solve the above problems, the present invention is a scroll compressor having an Oldham ring as a mechanism including a spiral wrap to form a compression chamber by meshing a fixed scroll and a turning scroll, and preventing rotation of the turning scroll. made from the key having a sliding surface for the annular member and the end face sliding with said orbiting scroll Rutotomoni lubricating oil is supplied is provided in the annular member on the side surface, the intersection of the side surface and the annular member end surface of the key, the A first plane formed in an oblique direction from the end surface of the annular member toward the base of the key; a second plane formed in parallel with the first plane from a side surface of the key; and the first plane. and wherein the obtaining Bei the R grooves constituted by a first curved surface connecting the said second plane and.
Further, the present invention provides a scroll compressor having a spiral wrap and meshing the fixed scroll and the orbiting scroll to form a compression chamber, and having an Oldham ring as a mechanism for preventing the rotation of the orbiting scroll. An annular member and a key provided on the end surface of the annular member and having a sliding surface on the side surface which is supplied with lubricating oil and slides on the orbiting scroll, and an intersection of the side surface of the key and the end surface of the annular member In addition, an R-groove composed of one plane formed obliquely from the end surface of the annular member toward the base of the key and one curved surface connected to the one plane from the side surface of the key is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the scroll compressor with high reliability of the cross | intersection part of a key side surface and an annular member end surface is obtained.

FIG. 2 is an Oldham ring perspective view of the first embodiment. Sectional drawing of the key and keyway of an Oldham ring of Example 1. FIG. Processing example of BB cross section. Processing example of keyway. The graph which shows the stress reduction effect. Sectional drawing of the compression mechanism part of a scroll compressor. Conventional Oldham ring perspective view. Sectional drawing of the key and keyway of a conventional Oldham ring. Sectional drawing of the key and keyway of an Oldham ring of Example 2. FIG. Sectional drawing of the key and keyway of an Oldham ring of Example 3. FIG. The Oldham ring perspective view of Example 4. FIG. The Oldham ring perspective view of Example 5. FIG. Sectional drawing of the key and keyway of an Oldham ring of Example 5. FIG. The example of a process of CC cross section.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show Embodiment 1 of the present invention. FIG. 1 is a perspective view showing an example of the shape of an Oldham ring, and FIG. 2 is a DD cross section when the Oldham ring of this embodiment is incorporated in the scroll compressor of FIG. 6 (D′-D ′). The same applies to the cross section). 1 and 2, 1 is an Oldham ring, 2 is a ring, 3 is an end face, 4 is a key, 4a is a key side surface, 4b is an R groove in an oblique direction, L1 is a plane of the R groove, and r2 is an R groove. A curved surface, L2, is a plane of the R groove portion.

  As shown in FIGS. 1 and 2, the Oldham ring 1 has a key 4 formed on an annular ring 2, and an R groove 4 b is formed obliquely from the end surface at the intersection of the key side surface 4 a and the end surface 3. The slanted R groove 4b is composed of a plane L1, a plane L2 parallel to the plane L1, and a curved surface r2 connecting between them. The oblique R groove 4b is provided so as not to interfere with the orbiting scroll 12 to be combined. That is, the curved surface r <b> 2 of the oblique R groove 4 b is provided inward from the intersection line of the key side surface 4 a and the end surface 3.

  Here, an example of processing of the oblique R groove 4b will be described with reference to FIG. FIG. 3 is a processing example of the BB cross section of FIG. 1, and A is an end mill. The processing order may be processing of the R groove 4b after the processing of the key side surface 4a and the end surface 3, or the order may be changed.

  According to this embodiment, the key groove chamfer 12d of the orbiting scroll 12 can be eliminated. Alternatively, high-precision chamfering management required in the prior art can be relaxed.

  Further, when the chamfering of the key groove portion is abolished, the prior art requires a dedicated expensive end mill for processing the key groove and the chamfer shown in FIG. 4A. According to this embodiment, FIG. An inexpensive end mill shown in (b) can be obtained.

  On the other hand, even if the chamfering of the key groove is not abolished, the conventional technology required high-precision chamfering management with a dedicated expensive end mill for processing the key groove and chamfering shown in Fig. 4 (a). According to the example, since high-precision chamfering is not required, the tool life can be extended.

  FIG. 5 is a graph showing an example of the stress reduction effect by the finite element analysis.

  The thickness H1, key height H2, key width W, and load F applied to the side of the key shown in FIG. 2 are fixed to the same values as those of the conventional Oldham ring, and the radius r and depth of the R-shaped groove 4b in the oblique direction are fixed. When the dimension h is a dimension that does not interfere with the orbiting scroll 12 to be combined, the stress generated in the oblique R groove 4b can be reduced by approximately 25%.

  In the prior art, only the R groove is used. However, providing the planes L1 and L2 increases the area of the R groove. Thereby, since the holding | maintenance capability of the lubricating oil supplied to Oldham ring key 4 becomes better, a sliding characteristic can be improved. That is, there is an effect of preventing galling and seizing due to oil shortage at a cold start. Further, during operation, it becomes a passage for lubricating oil, and lubrication to the sliding portion is facilitated, so that the sliding life can be extended.

  Further, in this embodiment, since the key side surface 4a and the oblique R groove 4b are processed separately, the key width W is further increased compared to the simultaneous processing of the key side surface 4a and the axial R groove 4c of the embodiment 4 described later. Processing can be performed with high accuracy in a short time.

  From the above, it is possible to obtain an Oldham ring with a low processing cost, a low manufacturing cost, and a highly reliable scroll compressor.

  FIG. 9 shows a second embodiment of the present invention. The present embodiment is different from the first embodiment in that the oblique R-groove 4b does not form the plane L1 and is configured by the curved surface r2 and the plane L2.

  Even if comprised in this way, the effect similar to the said Example 1 can be acquired.

  In addition, since the present embodiment does not form the plane L1 and is configured only by the curved surface r2 and the plane L2, the area of the key side surface 4a can be configured wider than that of the first embodiment. Thereby, since the surface pressure applied to the key side surface 4a can be reduced, the sliding characteristics can be further improved.

  FIG. 10 shows a third embodiment of the present invention. The present embodiment is different from the first embodiment in that the oblique R-groove 4b does not form the plane L2, but is composed of the plane L1 and the curved surface r2.

  Even if comprised in this way, the effect similar to the said Example 1 can be acquired.

  12 and 13 show a fourth embodiment of the present invention. FIG. 12 is a perspective view showing an example of the shape of the Oldham ring, and FIG. 13 is a DD cross section when the Oldham ring of this embodiment is incorporated in the scroll compressor of FIG. In FIG. 12, 1 is an Oldham ring, 2 is an annular ring, 3 is an end surface, 4 is a key, 4a is a key side surface, and 4c is an axial R groove.

  This embodiment differs from the first embodiment in that an R groove 4c is formed in the axial direction from the end surface at the intersection of the key side surface 4a and the end surface 3 as shown in FIGS.

  Here, a processing example of the axial R groove 4c will be described with reference to FIG. FIG. 14 is a processing example of the CC cross section of FIG. 12, and A is an end mill. The processing order may be processing of the key side surface 4a and the R groove 4c after the end surface 3 processing, or vice versa.

  Even if comprised in this way, the effect similar to the said Example 1 can be acquired.

  FIG. 11 shows Embodiment 5 of the present invention. Even if the Oldham ring key 4 shape protrudes outside the annular ring 2 as shown in FIG. 11, the same effect as the above embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Oldham ring 2 Ring 3 End surface 4 Key 4a Key side surface 4b Diagonal R groove 4c Axial R groove 4e Cross line of key side surface and end surface 11 Fixed scroll 11a Fixed scroll wrap 11b Fixed scroll discharge port 12 Orbiting scroll 12a orbiting scroll wrap 12b orbiting scroll bearing 12c orbiting scroll keyway 12d chamfering key groove chamfer 13 frame 13a frame bearing 13b frame keyway 14 motor 15 crankshaft 15a crankshaft eccentric part 16 bolt 17 sealing Case 18 Suction pipe A End mill L1 Plane 1 of R groove
Plane 2 of L2 R groove
Curved surface of r2 R groove

Claims (2)

In the scroll compressor having an Oldham ring as a mechanism for preventing the rotation of the orbiting scroll by forming a compression chamber by meshing the fixed scroll and the orbiting scroll with a spiral wrap,
The Oldham ring is made of the key having a sliding surface which slides with said orbiting scroll Rutotomoni lubricant provided on the end face of the annular member and the annular member is provided on the side surface,
At the intersection between the side surface and the annular member end surface before Symbol key, said a first plane formed in an oblique direction from the annular member end face towards the root of said key, said first plane from the side of the key scroll compressor, characterized in that to obtain Bei parallel to a second plane defined, R grooves constituted by a first curved surface connecting the said second plane and said first plane and. In the scroll compressor having an Oldham ring as a mechanism for preventing the rotation of the orbiting scroll by forming a compression chamber by meshing the fixed scroll and the orbiting scroll with a spiral wrap,
The Oldham ring is made of the key having a sliding surface which slides with said orbiting scroll Rutotomoni lubricant provided on the end face of the annular member and the annular member is provided on the side surface,
At the intersection between the side surface and the annular member end surface before Symbol key 1 and a plane formed in an oblique direction from the annular member end face towards the root of the key, first curved surface leading to said one plane from the side of the key scroll compressor, characterized in that to obtain Bei the R grooves configured in the.

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