JP2009024705A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noise by decreasing the number of projections becoming closest to a counter lap part at the same timing by disposing the projections in the lap part at non-constant intervals. <P>SOLUTION: A plurality of outer circumferential projections 14 are formed on the outer circumferential surface 3B of the lap part 3 of a fixed scroll 1, and a plurality of outer circumferential projections 15 are formed at the outer circumferential surface 12B of the lap part 12 of a rotary scroll 10. An angle θ between the adjoining projections 14 (projections 15) is gradually reduced from the outer diameter side of the lap parts 3, 12 toward the inner diameter side. When a compressor is operated, the projections 14 and 15 become closest to the counter lap parts 12 and 3 at a closure position of each compression chamber 13 for enhancing the seal performance of the compression chamber 13. The timing of each of the projections 14 and 15 to be the closest can be sifted from each other and the timing of the generation of noise generated when they are closest can thus be dispersed in terms of time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll fluid machine suitable for use in a compressor such as air or refrigerant, a vacuum pump, or the like.

  Generally, a scroll type fluid machine performs compression or pump operation of air, a refrigerant, or the like by orbiting a revolving scroll with respect to a fixed scroll (for example, see Patent Document 1 and Non-Patent Document 1).

JP-A-5-141379 Japan Society of Invention and Innovation Technical Bulletin No. 2001-1746

  In this scroll-type fluid machine according to the prior art, a fixed scroll and a turning scroll are provided so as to face each other. The fixed scroll and the turning scroll have an end plate formed in a disk shape and an axial direction on the end plate. It is each comprised by the spiral-shaped lap | wrap part erected.

  Further, the wrap portion of the fixed scroll and the orbiting scroll is formed so as to be spirally wound from the inner diameter side to the outer diameter side of the end plate, and defines a plurality of compression chambers by overlapping each other. .

  The scroll fluid machine sucks fluid from the suction port provided on the outer peripheral side of the fixed scroll when the orbiting scroll performs the orbiting motion, and sequentially compresses the fluid in each compression chamber while the inner periphery of the fixed scroll. The compressed fluid is discharged from the discharge port provided on the side toward the outside.

  Further, in the prior art, for example, by forming irregularities on the peripheral surfaces of the wrap portions of the fixed scroll and the orbiting scroll, the gap between the wrap portions is reduced to improve the sealing performance of the compression chamber and improve the compression efficiency. It is configured.

  In this case, a plurality of projections (concave grooves) extending in the axial direction are formed on the peripheral surface of each lap portion, and the angle formed between adjacent projections is the spiral direction of the wrap portion, that is, from the inner diameter side to the outer diameter side. Over the same angle.

  By the way, in the prior art described above, a plurality of protrusions (concave grooves) are provided on the peripheral surface of the lap portion, and the angle formed between adjacent protrusions is made substantially equal from the inner diameter side to the outer diameter side. However, in this case, when the orbiting scroll orbits with respect to the fixed scroll, for example, a plurality of protrusions at specific positions with respect to the spiral direction of the wrap portion are substantially equal in timing to the peripheral surface of the fixed scroll. To get closest (or contact).

  Then, in the portion where the protrusion is closest to the peripheral surface of the other party in this way, the fluid flows from the high pressure side compression chamber to the low pressure side compression chamber through a minute gap formed between them. Abnormal noise is generated by the principle of the whistle due to the flow vortex.

  For this reason, in the prior art, when a scroll fluid machine is operated, abnormal noises are generated from a plurality of locations at the same time between the fixed scroll and the orbiting scroll. There is a problem that the operating environment of the machine deteriorates due to leakage from the suction port or the like.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to increase the compression efficiency by the protrusion of the wrap portion, and in this state, noise and the like due to the protrusion can be suppressed and low noise can be achieved. It is an object of the present invention to provide a scroll type fluid machine that can realize a favorable operating environment.

  In order to solve the above-described problems, the present invention is directed to one scroll in which a wrap portion wound in a spiral shape from an inner diameter side to an outer diameter side is provided on an end plate and is opposed to the one scroll. In order to define a plurality of compression chambers on the end plate that overlaps with the wrap portion of the one scroll, a wrap portion wound in a spiral shape from the inner diameter side to the outer diameter side is erected in the axial direction. A scroll fluid machine having a plurality of protrusions extending in the axial direction at intervals in the spiral direction on at least the peripheral surface of the wrap portion of the one scroll. The plurality of protrusions are formed so that at least a part thereof is at unequal intervals, and at least one of the plurality of positions where the other scroll is closest to one scroll does not always have the protrusion. Is characterized in that the arranging the configuration.

  According to the present invention, the compression efficiency can be increased by the protrusions of the lap portion, and noise and the like due to the protrusions can be suppressed in this state, and a favorable operating environment can be realized with low noise.

  Hereinafter, a scroll type fluid machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 6 show a first embodiment according to the present invention. In this embodiment, a scroll type air compressor will be described as an example.

  In the figure, reference numeral 1 denotes a fixed scroll of a scroll type air compressor. The fixed scroll 1 is attached to an end portion of a cylindrical casing (not shown). The fixed scroll 1 includes a substantially disc-shaped end plate 2 disposed coaxially with an axis O1-O1 of a drive shaft 8 to be described later, and a spiral wrap portion 3 standing on the surface of the end plate 2. The cylindrical portion 4 is protruded in the axial direction so as to surround the wrap portion 3 from the outer diameter side of the end plate 2 and the flange portion 5 is protruded radially outward from the cylindrical portion 4.

  Here, the fixed scroll 1 is provided with a suction port 6 which is located on the outer diameter side of the end plate 2 and sucks air into a compression chamber 13 which will be described later, and the air compressed in the compression chamber 13 is externally provided at the center of the end plate 2. A discharge port 7 is provided to discharge the liquid.

  Further, as shown in FIG. 2, the lap portion 3 is cut using a cutting tool such as an end mill, so that the inner diameter side (inner side in the radial direction) becomes the winding start end, and the outer diameter side (in the radial direction). The outer side is formed in an n-wound spiral shape that is the end of the winding. In this case, the distance in the radial direction of each part of the lap portion 3, that is, the first and second volumes, the second and third volumes,... 3 is set to a radial dimension T shown in FIG. Further, the inner peripheral surface 3A of the wrap portion 3 is formed as a smooth curved surface without unevenness, and a fixed-side outer peripheral projection 14 described later is provided on the outer peripheral surface 3B of the wrap portion 3.

  A drive shaft 8 is rotatably provided on the casing. The drive shaft 8 has an axis O1-O1 (axial center O1) serving as a rotation center. The end of the drive shaft 8 is a crank 8A having an axis O2-O2 (axial center O2) that is eccentric with respect to the axis O1-O1 by a turning radius δ. A revolving scroll 10 to be described later is rotatably attached.

  Reference numeral 10 denotes a orbiting scroll provided on the drive shaft 8 so as to face the fixed scroll 1, and the orbiting scroll 10 includes a disc-like end plate 11 disposed coaxially with the axis O2-O2 of the crank 8A, and the end plate. 11 is substantially constituted by a spiral wrap portion 12 erected in the axial direction from the surface of 11.

  Here, as shown in FIG. 2, the wrap portion 12 is formed in a spiral shape with the inner diameter side serving as a winding start end and the outer diameter side serving as a winding end end. Further, the inner peripheral surface 12A of the wrap portion 12 is formed as a smooth curved surface without unevenness, and a turning-side outer peripheral protrusion 15 described later is provided on the outer peripheral surface 12B of the wrap portion 12. The wrap portion 12 is disposed so as to overlap with the wrap portion 3 of the fixed scroll 1 by, for example, 180 degrees, and a plurality of compression chambers 13 are defined between the wrap portions 3 and 12. ing.

  In the scroll type air compressor, since the crank 8A of the drive shaft 8 is eccentric by the turning radius δ, when the drive shaft 8 is driven to rotate, the turning scroll 10 is rotated by an anti-rotation mechanism (not shown) or the like. Revolution is performed in a state where the rotation is restricted, and a turning motion with a turning radius δ is performed with respect to the fixed scroll 1.

  Thus, the air compressor sequentially compresses the air sucked into the compression chambers 13 on the outer peripheral side from the suction port 6 in each compression chamber 13, and moves the discharge port 7 from the compression chamber 13 on the center side (the innermost diameter side). Compressed air is discharged to the outside. At this time, each compression chamber 13 is held in a highly sealed state by the outer peripheral projections 14 and 15 of the wrap portions 3 and 12.

  Reference numeral 14 denotes a fixed-side outer protrusion as a plurality of protrusions provided on the outer peripheral surface 3B of the wrap portion 3 of the fixed scroll 1, and each fixed-side outer protrusion 14 is, for example, substantially triangular as shown in FIGS. Is formed as a protrusion having a transverse cross-sectional shape, protrudes radially outward from the outer peripheral surface 3B of the wrap portion 3, and extends in the axial direction thereof.

  Here, when the orbiting scroll 10 orbits with respect to the fixed scroll 1, a part of the fixed outer peripheral protrusion 14 corresponding to the position and the inner peripheral surface 12 </ b> A of the lap portion 12 are closest to each other, or both are These are in contact with each other, and these closest approaches (contacts) are the closed positions where the air is confined in each compression chamber 13. And the fixed side outer periphery protrusion 14 reduces the clearance gap between the outer peripheral surface 3B of the lap | wrap part 3 and the inner peripheral surface 12A of the lap | wrap part 12 in the closed position of each compression chamber 13, and, thereby, each compression chamber 13 It improves the sealing performance.

  Further, as shown in FIG. 3, the outer peripheral protrusions 14 are arranged with a certain interval in the spiral direction (length direction) of the wrap portion 3. In this case, when the interval between the outer peripheral protrusions 14 is expressed by an angle θ defined by using the closed line C as described later, the angle θ between the two adjacent outer peripheral protrusions 14 is, for example, the wrap portion 3. The inner diameter side is gradually decreased from the inner diameter side toward the outer diameter side, and the inner diameter side and the outer diameter side are set at different angles.

  As a result, when the orbiting scroll 10 orbits, as shown in FIG. 6 described later, for example, the lap portion 12 of the orbiting scroll 10 comes closest to each fixed-side outer peripheral projection 14 at different timings. For this reason, even if an abnormal noise is generated when each of the outer peripheral projections 14 and the lap portion 12 are closest, the generation timing of the abnormal noise can be dispersed over time.

  Further, by gradually reducing the angle θ between the adjacent protrusions 14 from the inner diameter side toward the outer diameter side, the distance P between the protrusions 14 in the spiral direction of the wrap portion 3 (for example, the distance P1 shown in FIG. 3). , P2, P3) are formed at non-uniform intervals.

  Thereby, the space | interval P between the processus | protrusions 14 can be set to an appropriate magnitude | size on the inner diameter side and outer diameter side of the lap | wrap part 3, respectively. In this case, in the portion of the wrap portion 3 on the inner diameter side where the radius of curvature is small and the curve is sharp, each projection 14 approaches while the interval P1 between the projections 14 is appropriately reduced to improve the sealing performance of the compression chamber 13. This can be prevented. Further, at the outer diameter side portion where the radius of curvature is large and the curve is gentle, it is possible to prevent the interval P3 between the protrusions 14 from being excessively widened and to prevent the sealing performance of each compression chamber 13 from being lowered. In addition, the configuration can be set to an appropriate dimension.

  Further, as shown in FIG. 2, the largest interval among the projections 14 positioned at one turn of the innermost inner diameter of the wrap portion 3 is, for example, the interval between the projections 14 positioned at the end of the first winding (hereinafter referred to as “winding”). The maximum interval Pin on the inner diameter side. On the other hand, the largest interval among the projections 14 positioned at one turn of the outermost diameter of the wrap portion 3 is, for example, the interval between the projections 14 positioned at the winding end of the wrap portion 3 (hereinafter referred to as the outer diameter side). The maximum distance Pout on the outer diameter side is formed to have a dimension larger than the maximum distance Pin on the inner diameter side (Pout> Pin).

  Further, when viewed from the cross-section shown in FIG. 4, the fixed-side outer peripheral protrusion 14 is a recess that forms a left and right skirt that smoothly connects the narrow top portion 14 </ b> A and the top portion 14 </ b> A and the outer peripheral surface 3 </ b> B of the wrap portion 3. The circular arc surfaces 14B and 14B are formed. In this case, the top portion 14A is formed narrow with a width W1 of, for example, about 0 to 2 mm, preferably about 0.1 to 0.3 mm.

  Further, the width dimension W2 of the skirt portion of the fixed-side outer peripheral projection 14 is formed so as to satisfy the relationship of W2 ≧ W1 × 2 with respect to the width dimension W1 of the top portion 14A. Furthermore, the radial dimension (curvature radius) R of each concave arc surface 14B is, for example, 1/4 × T ≦ R ≦ T, preferably 2/5, with respect to the radial dimension T (see FIG. 3) of the wrap portion 3. It is set so as to satisfy the relationship of × T ≦ R ≦ 3/5 × T.

  On the other hand, 15 is a turning-side outer protrusion as a plurality of protrusions provided on the outer peripheral surface 12B of the wrap portion 12 of the orbiting scroll 10, and each turning-side outer protrusion 15 is fixed at the closed position of each compression chamber 13. By approaching the inner peripheral surface 3 </ b> A of the wrap portion 3 of the scroll 1 closest to the inner peripheral surface 3 </ b> A of the wrap portion 3, the gap between the inner peripheral surface 3 </ b> A of the wrap portion 3 and the outer peripheral surface 12 </ b> B of the wrap portion 12 is reduced.

  The turning-side outer peripheral protrusion 15 has, for example, a substantially triangular cross-sectional shape, and is arranged with a non-equal interval P in the spiral direction of the wrap portion 12, substantially the same as the fixed-side outer peripheral protrusion 14. It is formed with a shape and dimensions (width dimensions W1, W2, radius dimension R, etc.) that are substantially equal to the outer peripheral projection 14. Further, the interval P between the turning-side outer peripheral projections 15 is a maximum interval on the outer diameter side (corresponding to the maximum interval Pin of the outer peripheral projections 14) located on the inner diameter side of one turn of the wrap portion 12 (corresponding to the maximum interval Pin). (Corresponding to the maximum interval Pout) is formed in a large dimension.

  In addition, the angle θ between the swivel-side outer protrusions 15 is formed to be gradually smaller from the inner diameter side to the outer diameter side of the wrap portion 12, for example, as in the case of the fixed-side outer protrusion 14, and the inner diameter side and the outer diameter The angle is set differently on the side. Thereby, it becomes the structure which can disperse | distribute temporally the generation | occurrence | production timing of the noise by each outer periphery protrusion 15 approaching the lap | wrap part 3 of the fixed scroll 1 closest.

  Here, the relationship between the angle θ between the fixed outer peripheral projections 14 (between the orbiting outer peripheral projections 15) and the contraction line C of the orbiting scroll 10 will be described with reference to FIG.

  First, the contraction line C is known as a virtual circle serving as a reference for the involute (expansion line) of the lap portion 12, and has a predetermined radius (contraction line radius) around the axis O2 of the crank 8A. ) A. In this case, the contraction line radius a is an eigenvalue determined by the turning radius δ of the orbiting scroll 10 and the plate thickness dimension of the wrap portion 12.

  When the fixed-side outer peripheral protrusion 14 is described as an example, the angle θ between the adjacent protrusions 14 is a tangent line (for example, tangent lines L1, L2,. L3, L4) are defined as angles formed by two adjacent tangent lines (for example, angles θa, θb, θc).

  In addition, the angle θ between the outer peripheral projections 14 is gradually decreased from the inner diameter side to the outer diameter side in the spiral direction of the wrap portion 3, and thus, for example, the lap portion 3 is sequentially arranged from the inner diameter side to the outer diameter side. The magnitude relationship between the angles θa, θb, and θc between the protrusions 14 is set to satisfy θa> θb> θc. In this case, the angle θ between the two protrusions 14 positioned closest to the inner diameter side has a maximum value of about 9 to 11 °, for example, and the angle θ between the two protrusions 14 positioned closest to the outer diameter side is, for example, The maximum value is set to about 5 to 7 °.

  As described above, when the angle θ between the adjacent outer peripheral protrusions 14 is set to be different between the inner diameter side and the outer diameter side, when the orbiting scroll 10 performs the orbiting motion with respect to the fixed scroll 1, for example, On the other hand, the timing at which the opponent's lap portion 12 is closest can be made different for each protrusion 14.

  That is, when the orbiting scroll 10 is revolving, as shown in FIG. 6, for example, if the lap portion 12 of the orbiting scroll 10 comes closest to one fixed-side outer peripheral protrusion 14 at the position of point A, this is the same as this. The positions of the projections that are closest to each other at the timing are the position on the tangent line La that contacts the contraction line C through the point A, and the tangent line La ′ that is in a point-symmetrical relationship with respect to the tangent line La and the axis O2. The upper position.

  Therefore, by changing the angle θ of the outer peripheral protrusion 14 at an appropriate ratio from the inner diameter side to the outer diameter side, only the protrusion 14 is tangent La to the tangent lines La and La ′ corresponding to all the outer peripheral protrusions 14. The arrangement of the outer peripheral protrusions 14 can be determined so that the other outer peripheral protrusions 14 are located on the upper side and are located away from the tangent lines La and La ′. And in this arrangement | positioning state, when the lap | wrap part 12 approaches most with respect to the outer periphery protrusion 14 of the point A, it can be set as the positional relationship which the lap | wrap part 12 does not approach most with respect to the other outer periphery protrusion 14. .

  Further, the turning-side outer peripheral protrusion 15 can also vary the timing at which each outer peripheral protrusion 15 is closest to the counterpart lap portion 3 for each protrusion 15 in the same manner as in the case of the fixed-side outer peripheral protrusion 14. When the fixed outer peripheral protrusion 14 of A is in the closest state, for example, only one turning-side outer peripheral protrusion 15 is closest to the other lap portion 3 at a point A ′ located on the tangent line La ′. Can do.

  Therefore, in the present embodiment, for example, when the first, second,..., N-th part of the wrap part 12 is closest to the other lap part 3 simultaneously on the tangent lines La and La ′. In the orbiting scroll 10, the lap portion 12 always approaches the portion without the outer peripheral projection 14 (the inner peripheral surface 3 </ b> A of the wrap portion 3) at a plurality of locations excluding the position of the point A. Further, the orbiting scroll 10 is configured such that a portion without the outer peripheral projection 15 (the outer peripheral surface 12B of the wrap portion 12) is always closest to the lap portion 3 at a plurality of locations excluding the position of the point A ′. .

  As a result, during the orbiting movement of the orbiting scroll 10, for example, only the outer peripheral projections 14 and 15 positioned at points A and A 'are closest to the other lap portions 3 and 12 at the same timing. The group of protrusions that are in the approaching state can be configured to sequentially change according to the orbiting motion of the orbiting scroll 10.

  The scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the drive shaft 8 is rotationally driven by a drive source (not shown) such as an electric motor, the orbiting scroll 10 performs the orbiting motion with the orbiting radius δ around the axis O 1 -O 1 of the driving shaft 8. The compression chambers 13 defined between the wrap portion 3 and the wrap portion 12 of the orbiting scroll 10 are continuously reduced from the outer diameter side toward the inner diameter side. Thereby, the air sucked from the suction port 6 of the fixed scroll 1 can be discharged as compressed air from the discharge port 7 to an external tank (not shown) or the like while being sequentially compressed in each compression chamber 13.

  At this time, at the closed position of each compression chamber 13, the outer peripheral protrusion 14 on the fixed scroll 1 side is closest to the inner peripheral surface 12 </ b> A of the wrap portion 12 of the orbiting scroll 10, and the outer peripheral protrusion 15 on the orbiting scroll 10 side is fixed. Since it is closest to the inner peripheral surface 3A of the lap portion 3 of the scroll 1, air can be confined in each compression chamber 13 by these outer peripheral projections 14 and 15, and the sealing performance is improved and the compression performance is improved. be able to.

  Further, the timing at which each outer peripheral projection 14, 15 is closest to the other lap portion 3, 12 is shifted little by time depending on the setting that the angle θ is an unequal angle. It is possible to prevent the state of being closest.

  Thus, in the present embodiment, the intervals P between the adjacent fixed-side outer projections 14 (between the turning-side outer projections 15) are formed at non-uniform intervals, and the angle θ between the projections is set to the inner diameter side of the wrap portions 3 and 12. Therefore, when the compressor is in operation, the timing at which the individual fixed-side outer protrusions 14 come closest to the lap portion 12 can be set to be different from each other. It is possible to set the timing at which the lap portion 3 is approached closest to each other.

  As a result, even if abnormal noise is generated due to air eddy current or the like when the outer peripheral projections 14 and 15 are closest to the lap portions 3 and 12 of the other party, the generation timing of these abnormal noises can be dispersed in time. Thus, it is possible to reliably prevent large noises from being generated when these abnormal noises leak out from the suction port 6 of the compressor all at once.

  Therefore, during the operation of the compressor, the outer peripheral projections 14 and 15 can improve the sealing performance of the compression chambers 13 and improve the compression efficiency, and also can suppress the noise level during the compression operation, realizing a good operating environment with low noise. can do.

  In this case, since the angle θ between the adjacent outer peripheral protrusions 14 (between the outer peripheral protrusions 15) is gradually decreased from the inner diameter side to the outer diameter side of the wrap portions 3 and 12, the curvature is greater on the outer diameter side than on the inner diameter side. With respect to the spiral wrap portions 3 and 12 having a large radius, the dimension between the protrusions 14 (between the protrusions 15) is excessively widened on the outer diameter side, and the sealing performance of the compression chambers 13 is deteriorated. Therefore, the compression operation can be stably performed from the outer diameter side to the inner diameter side of the wrap portions 3 and 12. And angle (theta) of protrusion 14 and 15 arrange | positioned at each site | part of the lap | wrap parts 3 and 12 can be set to a suitable magnitude | size according to the curvature radius of the said site | part.

  Further, since the maximum distance Pout on the outer diameter side of the fixed outer peripheral projection 14 is formed larger than the maximum distance Pin on the inner diameter side, the outer radius side having a large curvature radius and the inner diameter side having a small curvature radius of the wrap portion 3 are formed. Thus, the protrusions 14 can be arranged with an interval P of appropriate dimensions. Similarly, in the case of the turning-side outer peripheral projection 15, the maximum interval on the outer diameter side is formed larger than the maximum interval on the inner diameter side, so that it is appropriate for each of the outer diameter side and the inner diameter side of the wrap portion 12. The protrusions 15 can be arranged with a dimension interval P.

  Further, since the fixed-side outer peripheral protrusion 14 is provided on the wrap portion 3 of the fixed scroll 1 and the turning-side outer peripheral protrusion 15 is provided on the wrap portion 12 of the orbiting scroll 10, these outer peripheral protrusions 14 and 15 are connected to the other lap portion 12, 3 can be made closest to the smooth inner peripheral surfaces 12A and 3A, and contact between the projections, galling, and the like can be prevented.

  On the other hand, the top portion 14A of the fixed-side outer peripheral projection 14 is formed to be narrow with a width dimension W1 of, for example, about 0 to 2 mm, preferably about 0.1 to 0.3 mm. 12 can be easily crushed or worn and deformed, and can quickly adapt to the inner peripheral surface 12A. Thereby, it can prevent that the lap | wrap part 12 and the outer periphery protrusion 14 contact many times, and can prevent power loss, a galling, etc., improving the sealing property of the compression chamber 13. FIG.

  And since the width dimension W2 of the skirt part of the outer periphery protrusion 14 was formed so that it might become 2 times or more of the width dimension W1 of the top part 14A, even when the outer periphery protrusion 14 contacted the lap | wrap part 12 of the turning scroll 10, Sufficient strength that does not damage the whole can be secured, and durability and reliability can be improved.

  Further, the radial dimension R of the concave arcuate surface 14B of the outer peripheral projection 14 is, for example, 1/4 × T ≦ R ≦ T, preferably 2/5 × T ≦ R ≦ 3 with respect to the radial direction dimension T of the wrap portion 3. Since it is set to be / 5 × T, for example, when cutting the outer peripheral surface 3B of the lap portion 3 and each outer peripheral projection 14 using a cutting tool such as an end mill, the efficiency is continuously increased with the same cutting tool. It can be processed well and productivity can be improved.

  On the other hand, the turning-side outer peripheral protrusion 15 is also formed to have dimensions substantially equal to the width dimensions W1, W2, the radial dimension R, etc. of the outer peripheral protrusion 14, so that the same effect can be obtained.

  Next, FIG. 7 shows a second embodiment according to the present invention. The feature of this embodiment is that a non-projection forming portion is provided on the outer diameter side of the wrap portion. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 21 denotes a fixed scroll of a scroll type air compressor, and the fixed scroll 21 is constituted by an end plate 22, a lap portion 23, a cylindrical portion 24, a flange portion (not shown), etc., as in the first embodiment. Has been. The wrap portion 23 is formed in a spiral shape having an inner peripheral surface 23A and an outer peripheral surface 23B.

  However, the wrap portion 23 is provided with a non-projection forming portion 23C which is located on the outer diameter side (winding end end side) and does not form the fixed-side outer peripheral projection 14, and this non-projection formation portion 23C is, for example, a wrap portion 23 extends from the end portion on the outer diameter side toward the inner diameter side with a length of approximately one turn.

  In this case, the non-protrusion forming portion 23C is disposed in a portion of the wrap portion 23 that becomes a peripheral wall of an outer diameter side compression chamber 13 ′, 13 ″, which will be described later, and a non-protrusion forming portion is formed on the outer peripheral surface 23B of the wrap portion 23. A plurality of fixed-side outer peripheral projections 14 are provided in a portion excluding the portion 23C (a portion located on the inner diameter side of the non-projection forming portion 23C).

  Reference numeral 25 denotes a orbiting scroll disposed opposite to the fixed scroll 21. The orbiting scroll 25 is substantially the same as in the first embodiment, and the spiral wrap portion 26 is provided upright on an end plate (not shown). The wrap portion 26 has an inner peripheral surface 26A and an outer peripheral surface 26B.

  Further, the wrap portion 26 is provided with a non-projection forming portion 26C that is located on the outer diameter side thereof and does not form the turning-side outer peripheral projection 15 in the same manner as the wrap portion 23 of the fixed scroll 21. 26C extends, for example, from the outer diameter side end portion of the wrap portion 26 toward the inner diameter side with a length of approximately one and a half turns.

  In this case, the non-protrusion forming portion 26C is disposed in a portion of the wrap portion 26 that is a peripheral wall of the compression chambers 13 ′ and 13 ″ on the outer diameter side, and the non-projection forming portion 26C is disposed on the outer peripheral surface 26B of the wrap portion 26. A plurality of swivel-side outer peripheral projections 15 are provided in a portion excluding (a portion located on the inner diameter side of the non-projection forming portion 23C).

  Here, when the position at which the winding end of the wrap portion 26 of the orbiting scroll 25 is closest to the wrap portion 23 of the fixed scroll 21 is the compression start position S, the outer diameters of the wrap portions 23 and 26 are at the compression start position S. Two compression chambers 13 (outer diameter side compression chambers 13 ', 13 ") are defined by the side, and these outer diameter side compression chambers 13', 13" are just sucked from the suction port 6. The intake air is confined.

  In the present embodiment, the non-projection forming portions 23C and 26C are disposed in the portions of the wrap portions 23 and 26 facing the outer diameter side compression chambers 13 'and 13' '. During the operation, the lap portion 23 of the fixed scroll 21 and the lap portion 26 of the orbiting scroll 25 can be brought into sliding contact smoothly and continuously at the positions of the compression chambers 13 ′ and 13 ″ on the outer diameter side.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, a non-projection forming portion 23C is provided in the portion of the wrap portion 23 of the fixed scroll 21 that is located on the outer diameter side for approximately one turn, and the wrap portion 26 of the orbiting scroll 25 has an outer portion. It is set as the structure which provides the non-protrusion formation site | part 26C in the site | part of about one and a half turns on the diameter side.

  Thereby, for example, at the closed position (compression start position S) of the compression chamber 13 ′ defined at the outermost diameter side of the wrap portions 23, 26, the closed position of the compression chamber 13 ″, etc. 26 smooth inner peripheral surfaces 23A and outer peripheral surfaces 26B, and outer peripheral surfaces 23B and inner peripheral surfaces 26A can be brought closest to or in contact with each other.

  For this reason, it is possible to satisfactorily maintain the sealing performance of the compression chamber 13 'at the compression start position S and the sealing performance of the compression chamber 13 "adjacent to the compression chamber 13'. Can be stably compressed in the compression chambers 13 'and 13' 'on the outer diameter side having a large diameter, and the compression performance can be improved.

  Next, FIGS. 8 to 10 show a third embodiment according to the present invention. The feature of this embodiment is that the fixed scroll protrusion and the orbiting scroll protrusion are located at different positions with respect to the spiral direction of the wrap portion. It is that it was set as the structure arrange | positioned. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 31 denotes a fixed scroll of a scroll type air compressor, and the fixed scroll 31 is constituted by an end plate 32, a lap portion 33, a cylindrical portion 34, a flange portion (not shown), etc., as in the first embodiment. Has been. The wrap portion 33 is formed in a spiral shape having an inner peripheral surface 33A and an outer peripheral surface 33B, and a fixed-side outer peripheral projection 35 to be described later is provided on the outer diameter side in substantially the same manner as in the second embodiment. A non-projection forming portion 33C that is not formed is provided.

  Reference numeral 35 denotes a fixed-side outer peripheral protrusion as a plurality of protrusions provided on the lap portion 33 of the fixed scroll 31, and each fixed-side outer peripheral protrusion 35 is, for example, a substantially triangular crossing, as in the first embodiment. It is formed as a projection having a surface shape, and protrudes radially outward from the outer peripheral surface 33B of the lap portion 33 except for the non-projection forming portion 33C and extends in the axial direction thereof.

  Further, the fixed-side outer peripheral projections 35 are arranged at intervals P in the spiral direction of the wrap portion 33, and the intervals P are set at unequal intervals at each portion of the wrap portion 33. Further, the angle θ between the adjacent outer peripheral projections 35 is gradually decreased from the inner diameter side to the outer diameter side of the wrap portion 33. For example, the angles θd and θe between the projections 35 shown in FIG. The relationship of θe is satisfied.

  Reference numeral 36 denotes a orbiting scroll disposed opposite to the fixed scroll 31. The orbiting scroll 36 is provided with a spiral wrap portion 37 standing on an end plate (not shown) in substantially the same manner as in the first embodiment. The wrap portion 37 has an inner peripheral surface 37A and an outer peripheral surface 37B. Further, on the outer diameter side of the wrap portion 37, a non-projection forming portion 37 </ b> C that does not form a turning-side outer peripheral projection 38 described later is provided.

  Reference numeral 38 denotes an orbiting side outer peripheral protrusion as a plurality of protrusions provided on the lap portion 37 of the orbiting scroll 36. Each of the orbiting outer peripheral protrusions 38 is a non-protrusion forming portion 37C in substantially the same manner as in the first embodiment. Except for the outer circumferential surface 37B of the wrap portion 37. Further, the interval P between the respective turning-side outer peripheral projections 38 is set to be non-equal intervals in each part of the wrap portion 37, as in the first embodiment, and the angle θ between the projections 38 is, for example, the lap portion 37 is gradually formed smaller from the inner diameter side toward the outer diameter side.

  However, each swivel-side outer peripheral projection 38 is disposed, for example, at a position that is intermediate between each fixed-side outer peripheral projection 35 with respect to the spiral direction, and these outer peripheral projections 35, 38 correspond to the spiral direction of the wrap portions 33, 37. The positions are staggered.

In this case, the state in which the outer peripheral projections 35 and 38 are staggered is, for example, a plurality of tangent lines L _k that contact the contracted line C through each fixed-side outer peripheral projection 35 and each swivel side, as shown in FIG. When a plurality of tangent lines L _s that are in contact with the contracted line C through the outer peripheral projection 38 are drawn, the tangent lines L _k and L _s are at different angles and are arranged alternately with respect to the spiral direction. is there.

  As described above, when the angle θ between the outer peripheral protrusions 35 (between the outer peripheral protrusions 38) is set to be different between the inner diameter side and the outer diameter side of the wrap portions 33 and 37, and the positions of the protrusions 35 and 38 are shifted from each other in the spiral direction. In addition, the timing at which each fixed-side outer peripheral projection 35 approaches the counterpart lap portion 37 (timing at which the turning-side outer peripheral projection 38 approaches the counterpart lap portion 33) can be made different, and the fixed-side outer periphery Even between the protrusion 35 and the turning-side outer peripheral protrusion 38, the timing at which they are closest to the counterpart lap portions 33 and 37 can be set different from each other.

  That is, for example, the closest approach timing of the outer peripheral projections 35 and 38 will be described with reference to FIG. First, the fixed outer peripheral projection 35 will be described. As in the case described in the first embodiment (FIG. 6), for example, at the position of point A, the orbiting scroll 36 is moved with respect to one fixed outer peripheral projection 35. When the lap portion 37 is closest, the position of the protrusion that reaches the closest state at the same timing as the protrusion 35 is a position on the tangent line La, La ′.

Therefore, by changing the angle θ between the outer peripheral protrusions 35 at an appropriate ratio from the inner diameter side to the outer diameter side, for example, only the protrusion 35 has the tangent lines La and La ′ corresponding to all the outer peripheral protrusions 35. It is arranged on the tangent line La, and the other protrusions 35 can be positioned away from the tangent lines La and La ′. Similarly, with respect to the turning-side outer peripheral protrusion 38, by appropriately changing the angle θ between the protrusions 38, for example, only the protrusion 38 is tangent to the tangent lines La and La ′ corresponding to all the outer peripheral protrusions 38. It can be set to be arranged on La.

  Furthermore, by disposing the projections 35 and 38 in a staggered manner, only one of the outer peripheral projections 35 and 38 is tangent La, La ′ regardless of the position of the orbiting scroll 36. Even if the fixed side and the turning side are included, two or more protrusions can be configured not to be in the closest state at the same timing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first and second embodiments. In particular, in the present embodiment, since the positions of the fixed outer peripheral protrusion 35 and the swivel outer peripheral protrusion 38 are shifted from each other with respect to the spiral direction of the wrap portions 33, 37, The timing at which the opponent's lap portion 37 is closest to the timing and the timing at which each turning-side outer peripheral projection 38 is closest to the opponent's lap portion 33 can be made different.

  Thereby, in the whole compressor including the fixed scroll 31 and the orbiting scroll 36, the number of projections 35 and 38 that are in the closest state at the same timing can be further reduced, and the noise level of the compressor is sufficiently reduced. can do.

  Next, FIGS. 11 and 12 show a fourth embodiment according to the present invention, and the feature of this embodiment is that a projection is provided on the inner peripheral surface of the lap portion of the fixed scroll and the orbiting scroll. is there. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes a fixed scroll, and the fixed scroll 41 includes a mirror plate 42, a lap portion 43, a cylinder portion 44, a flange portion (not shown), and the like, as in the first embodiment. The wrap portion 43 is formed in a spiral shape having an inner peripheral surface 43A and an outer peripheral surface 43B, and on the outer diameter side thereof, a fixed-side inner peripheral protrusion 45, which will be described later, is substantially the same as in the second embodiment. A non-protrusion forming portion 43C that does not form a surface is provided.

  Reference numeral 45 denotes a fixed-side inner protrusion as a plurality of protrusions provided on the inner peripheral surface 43A of the lap portion 43 of the fixed scroll 41. Each fixed-side inner protrusion 45 has, for example, a substantially triangular cross-sectional shape. It is formed as a protrusion and protrudes radially inward from the inner peripheral surface 43A of the lap portion 43 except for the non-protrusion forming portion 43C and extends in the axial direction thereof.

  Further, the inner peripheral protrusions 45 are arranged at intervals P in the spiral direction of the wrap portion 43, and the intervals P are set at unequal intervals at each portion of the wrap portion 33. Further, the angle θ between the adjacent inner peripheral projections 45 is gradually decreased from the inner diameter side to the outer diameter side of the wrap portion 43. For example, the angles θf and θg between the projections 45 shown in FIG. The relation of> θg is satisfied.

  46 is a orbiting scroll disposed opposite to the fixed scroll 41, and the orbiting scroll 46 is provided with a spiral wrap portion 47 standing on an end plate (not shown) in substantially the same manner as in the first embodiment. The wrap portion 47 has an inner peripheral surface 47A and an outer peripheral surface 47B. Further, on the outer diameter side of the wrap portion 47, a non-projection forming portion 47C that does not form a turning-side inner peripheral projection 48 described later is provided.

  Reference numeral 48 denotes a turning-side inner peripheral protrusion as a plurality of protrusions provided on the inner peripheral surface 47 A of the lap portion 47 of the orbiting scroll 46. Each turning-side inner peripheral protrusion 48 is substantially the same as each fixed-side inner peripheral protrusion 45. Similarly, it protrudes radially inward from the inner peripheral surface 47A of the wrap portion 47 except for the non-projection forming portion 47C.

  In addition, the interval P between the adjacent inner peripheral projections 48 is set to be non-uniform at each part of the wrap portion 47, as in the first embodiment, and the angle θ between the projections 48 is, for example, the wrap portion. 47 is gradually formed smaller from the inner diameter side toward the outer diameter side. Further, the positions of the fixed-side inner peripheral projection 45 and the turning-side inner peripheral projection 48 in the spiral direction of the wrap portions 43 and 47 are staggered in the same manner as in the third embodiment.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first to third embodiments. In particular, in the present embodiment, the fixed scroll 41 is provided with the fixed inner peripheral projections 45 and the orbiting scroll 46 is provided with the rotary inner peripheral projections 48. Therefore, during operation of the compressor, these inner peripheral projections are provided. The protrusions 45 and 48 can be brought closest to the smooth outer peripheral surfaces 47B and 43B of the counterpart lap portions 47 and 43, and the compression operation can be stably performed.

  Next, FIG. 13 and FIG. 14 show a fifth embodiment according to the present invention, and the feature of this embodiment is that a projection is provided on the inner peripheral surface and the outer peripheral surface of the wrap portion of one scroll. There is. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 51 denotes a fixed scroll, and the fixed scroll 51 includes a mirror plate 52, a wrap part 53, a cylinder part 54, a flange part (not shown), and the like, as in the first embodiment. The wrap portion 53 is formed in a spiral shape having an inner peripheral surface 53A and an outer peripheral surface 53B.

  55 is a orbiting scroll disposed opposite to the fixed scroll 51, and the orbiting scroll 55 is provided with a spiral wrap portion 56 standing on an end plate (not shown) in substantially the same manner as in the first embodiment. The wrap portion 56 has an inner peripheral surface 56A and an outer peripheral surface 56B. Further, on the outer diameter side of the wrap portion 56, a non-projection forming portion 56C that does not form projections 57 and 58, which will be described later, is provided in substantially the same manner as in the second embodiment.

  Reference numeral 57 denotes a turning-side inner peripheral protrusion as a plurality of protrusions provided on the inner peripheral surface 56A of the lap portion 56 of the turning scroll 55. Each turning-side inner peripheral protrusion 57 is substantially the same as that of the fourth embodiment. Similarly, except for the non-projection forming portion 56C, it projects radially inward from the inner peripheral surface 56A of the lap portion 56 and extends in the axial direction thereof.

  The intervals P between the inner peripheral projections 57 are set at non-equal intervals at each part of the wrap portion 56. Further, the angle θ between the inner peripheral protrusions 57 is gradually decreased from the inner diameter side to the outer diameter side of the wrap portion 56. For example, the angles θh and θi between the protrusions 57 shown in FIG. The relationship of θi is satisfied.

  58 is a turning-side outer peripheral protrusion as a plurality of protrusions provided on the outer peripheral surface 56B of the wrap portion 56 of the orbiting scroll 55, and each turning-side outer peripheral protrusion 58 is substantially the same as in the first embodiment. It protrudes radially outward from the outer peripheral surface 56B of the wrap portion 56 except for the non-projection forming portion 56C.

  In this case, the interval P between the adjacent outer peripheral projections 58 is set to be non-uniform at each part of the wrap portion 56, and the angle θ between the projections 58 is, for example, from the inner diameter side to the outer diameter side of the wrap portion 56. It is gradually formed smaller. In addition, the positions of the inner peripheral protrusion 57 and the outer peripheral protrusion 58 are staggered in the spiral direction of the wrap portions 53 and 56, as in the third embodiment.

In this case, the state in which the projections 57 and 58 are shifted in a zigzag, as shown in FIG. 14, the tangent L _i a plurality of contacting the evolute C for example through the inner peripheral projection 57, each outer peripheral projection 58 When a plurality of tangent lines L _o that are in contact with the contracted line C are drawn, these tangent lines L _i and L _o are at different angles and are arranged alternately with respect to the spiral direction.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first to third embodiments. In particular, in the present embodiment, since the inner peripheral surface 57A is provided with each turning-side inner peripheral protrusion 57 with respect to the lap portion 56 of the orbiting scroll 55, the outer peripheral surface 56B is provided with each turning-side outer peripheral protrusion 58. There is no need to process and form a protrusion or the like on the lap portion 53 of the fixed scroll 51 that is heavier than the orbiting scroll 55, and the processing operation can be performed easily.

  In each of the above embodiments, the angle θ (θa to θi) of the protrusions 14, 15, 35, 38, 45, 48, 57, 58 is set to the wrap portions 3, 12, 23, 26, 33, 37, 43. 47, 56 are configured to gradually decrease from the inner diameter side toward the outer diameter side. However, the degree of difference of the angle θ in the present invention is not limited to the embodiment, and may be configured as a modification shown in FIG. 15, for example.

  In this case, the inner peripheral surface 56A ′ of the wrap portion 56 ′ of the orbiting scroll 55 is provided with a plurality of orbiting-side inner peripheral projections 57 ′ with an interval P, and the interval P (angle θ) between the adjacent projections 57 ′. Are set as dimensions (angles) that vary irregularly from the inner diameter side to the outer diameter side of the wrap portion 56 ′. Similarly, the distance P (angle θ) between the turning-side outer peripheral protrusions 58 ′ provided on the outer peripheral surface 56 </ b> B ′ of the wrap part 56 ′ is also a dimension (angle) that changes irregularly at each part of the wrap part 56 ′. Is set as

  Further, in the present invention, the projections 14, 15, 35, 38, 45, 48, etc. are combined with any one of the first to fourth embodiments in the modification of FIG. Of course, the angle θ of 57 and 58 may be configured as an irregularly changing angle.

  In the first to fourth embodiments, the fixed scrolls 1, 21, 31, 41 are provided with the protrusions 14, 35, 45, and the orbiting scrolls 10, 25, 36, 46 are provided with the protrusions 15, 38, 48. The configuration. However, the present invention is not limited to this. For example, a protrusion may be provided on one or both of the inner peripheral surface and the outer peripheral surface of the fixed scroll, and the protrusion of the orbiting scroll may be omitted. Moreover, this invention is good also as a structure which abbreviate | omits the protrusion of a fixed scroll and provides a protrusion in any one of the internal peripheral surface and outer peripheral surface of a turning scroll.

  Moreover, in embodiment, the scroll-type air compressor which makes the turning scroll 10, 25, 36, 46, 55 orbit with respect to the fixed scroll 1,21,31,41,51 fixed to the casing is mentioned as an example. Explained. However, the present invention is not limited to this. For example, as shown in Japanese Patent Laid-Open No. 9-133307, the present invention is applied to a full-scale rotary scroll fluid machine that drives two scrolls arranged opposite to each other. May be.

  Furthermore, in the embodiment, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention is not limited to this, and may be applied to other scroll type fluid machines such as a refrigerant compressor for compressing a refrigerant.

  As described above in detail, according to the first aspect of the present invention, at least a part of each protrusion of the wrap portion is formed at non-uniform intervals, and the other scroll is closest to one scroll. At least one of the plurality of locations was configured so that there was no protrusion. By configuring in this way, for example, when one scroll makes a turning motion, the projection of one scroll is closest to the lap portion of the other scroll at the closed position of each compression chamber (the position that becomes the boundary of the compression chamber). Or it can be made to contact and the sealing of each compression chamber can be improved with a protrusion.

  Also, at least some of the intervals between the protrusions (the dimensions in the spiral direction) are formed at non-equal intervals. For example, each of the first, second,. When approaching, at least one of the plurality of closest approach parts is configured such that the part without protrusions (the circumferential surface of the wrap portion) is always closest to the other scroll. It is possible to prevent the protrusions from approaching the opponent's lap portion all at once, and to set the timing at which the protrusions approach the opponent's lap portion at the same time. As a result, even if an abnormal noise is generated due to an air vortex or the like when each protrusion is closest to the lap portion of the other party, the generation timing of the abnormal noise can be shifted in time and distributed. It is possible to reliably prevent the generation of loud noise due to the sound leaking out of the machine all at once. Therefore, the sealing of each compression chamber can be improved by the protrusions of the wrap portion, the compression efficiency can be improved, the noise level of the entire machine can be suppressed, and a good operating environment can be realized with low noise.

  Further, according to the invention of claim 2, since the angle between the adjacent protrusions is made different between the inner diameter side and the outer diameter side of the wrap part, the difference when each protrusion comes closest to the other lap part is different. Sound generation timing can be dispersed over time.

  Further, according to the invention of claim 3, since the protrusions are provided on the outer peripheral surface of the lap portion with respect to one scroll and the other scroll, the positions of these protrusions are shifted in the spiral direction. During the turning motion of the scroll, the protrusions arranged on the outer peripheral surface of each scroll can be brought closest to the smooth inner peripheral surface of the other scroll. For this reason, contact between the projections, galling, and the like can be reliably prevented, and durability and reliability can be improved. In addition, the timing at which one scroll projection approaches the other scroll can be different from the timing at which the other scroll projection approaches the one scroll. For this reason, in the entire machine including both scrolls, the number of protrusions that are in the closest state at the same timing can be further reduced, and the noise level of the machine can be sufficiently reduced.

  Further, according to the invention of claim 4, projections are provided on the inner peripheral surface of the lap portion with respect to one scroll and the other scroll, and the positions of these projections are shifted in the spiral direction. Therefore, during the turning motion of the scroll, the protrusions arranged on the inner peripheral surface of each scroll can be brought closest to the smooth outer peripheral surface of the other scroll. As a result, it is possible to reliably prevent contact between the protrusions, galling, and the like, and to reduce the number of protrusions that are in the closest state at the same timing, thereby realizing a low-noise machine.

  According to the invention of claim 5, protrusions are provided on the inner peripheral surface and the outer peripheral surface of the wrap portion with respect to one scroll, and the positions of the protrusions on the inner peripheral surface and the outer peripheral surface are shifted in the spiral direction. Since it is configured to be arranged, during the turning motion of the scroll, the protrusion arranged on one scroll can be brought closest to the smooth inner and outer peripheral surfaces of the other scroll. As a result, it is possible to reliably prevent contact between the protrusions, galling, and the like, and to reduce the number of protrusions that are in the closest state at the same timing, thereby realizing a low-noise machine. Further, it is not necessary to process and form a protrusion or the like on the other scroll, and the processing operation can be easily performed.

  According to the invention of claim 6, the angle between the protrusions is formed smaller on the outer diameter side than on the inner diameter side of the wrap portion. As a result, the radius of curvature of the wrap portion is larger on the outer diameter side than on the inner diameter side. Therefore, by reducing the angle between the protrusions on the outer diameter side of the wrap portion, the dimension between the protrusions on the outer diameter side is reduced. It is possible to prevent it from spreading too much. Therefore, it is possible to prevent the dimension between the protrusions from being excessively widened on the outer diameter side of the wrap portion and thereby reducing the sealing performance of the compression chamber, and to stably perform the compression operation from the outer diameter side to the inner diameter side of the wrap portion. it can.

  According to the invention of claim 7, the angle between the protrusions is gradually reduced from the inner diameter side in the spiral direction of the wrap portion toward the outer diameter side. As a result, the radius of curvature of the wrap portion gradually increases from the inner diameter side toward the outer diameter side, so the angle of the protrusions arranged at each portion of the wrap portion has an appropriate size according to the curvature radius of the portion. The compression operation can be stably performed from the outer diameter side to the inner diameter side of the wrap portion.

  According to the invention of claim 8, each protrusion is formed only on the inner diameter side in the spiral direction of the wrap portion, and a non-projection forming portion is provided on the outer diameter side of the wrap portion. Thereby, for example, at the closed position (compression start position) of the compression chamber defined on the outermost diameter side of the lap portion, the smooth peripheral surfaces of the lap portions can be brought close to or in contact with each other, and compression is performed. It is possible to satisfactorily seal the outer diameter side compression chamber having a great influence on the volumetric efficiency at the time, and to improve the compression performance.

  According to the ninth aspect of the present invention, the non-projection forming portion of the wrap portion is configured as a portion extending approximately one turn from the compression start position of the wrap portion toward the inner diameter side. The sealing performance of the compression chamber on the diameter side can be improved, and the compression operation can be stably performed from the outer diameter side to the inner diameter side of the wrap portion.

  Furthermore, according to the invention of claim 10, each projection has a configuration in which the maximum interval on the outer diameter side of the wrap portion is formed larger than the maximum interval on the inner diameter side. Protrusions can be arranged at intervals of appropriate dimensions for the side and the inner diameter side having a small radius of curvature.

It is a longitudinal section showing a scroll type air compressor by a 1st embodiment of the present invention. It is the cross-sectional view which looked at the scroll type air compressor from the arrow II-II direction in FIG. FIG. 3 is an enlarged cross-sectional view of a main part showing an enlarged view of a wrap portion of a fixed scroll and a wrap portion of a turning scroll in FIG. 2. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixed-side outer peripheral protrusion in FIG. 3 in an enlarged manner. It is an external appearance perspective view of a partial fracture which expands and shows a part of end plate of a fixed scroll, a lap part, and a fixed side peripheral projection. It is explanatory drawing which shows the state of each outer periphery protrusion when a turning scroll turns. It is a cross-sectional view which shows the scroll type air compressor by the 2nd Embodiment of this invention. It is a cross-sectional view which shows the scroll type air compressor by the 3rd Embodiment of this invention. FIG. 9 is an enlarged cross-sectional view of a main part showing an enlarged view of a wrap portion of a fixed scroll and a wrap portion of a turning scroll in FIG. 8. It is explanatory drawing which shows the state of each outer periphery protrusion when a turning scroll turns. It is a cross-sectional view which shows the scroll type air compressor by the 4th Embodiment of this invention. FIG. 12 is an enlarged cross-sectional view of the main part showing the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll in FIG. 11 in an enlarged manner. It is a cross-sectional view which shows the scroll type air compressor by the 5th Embodiment of this invention. FIG. 14 is an enlarged cross-sectional view of the main part showing the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll in FIG. 13 in an enlarged manner. It is a cross-sectional view which shows the scroll type air compressor by the modification of this invention.

Explanation of symbols

1,21,31,41,51 Fixed scroll 2,11,22,32,42,52 End plate 3,12,23,26,33,37,43,47,53,56,56 'Lapping part 3A, 12A , 23A, 26A, 33A, 37A, 43A, 47A, 53A, 56A, 56A 'Inner peripheral surface (peripheral surface)
3B, 12B, 23B, 26B, 33B, 37B, 43B, 47B, 53B, 56B, 56B 'Outer peripheral surface (peripheral surface)
8 Drive shaft 10, 25, 36, 46, 55 Orbiting scroll 13, 13 ', 13 "Compression chamber 14, 35 Fixed side outer peripheral protrusion (protrusion)
14A Top portion 14B Concave arc surface 15, 38, 58, 58 ′ Turning side outer peripheral protrusion (protrusion)
23C, 26C, 33C, 37C, 43C, 47C, 56C Non-projection forming portion 45 Fixed side inner peripheral projection (projection)
48, 57, 57 'Rotating side inner peripheral protrusion (protrusion)
P, P1-P3 interval Pin, Pout Maximum interval θ, θa-θi Angle S Compression start position

Claims (10)

One scroll having a wrap portion wound in a spiral shape from the inner diameter side to the outer diameter side on the end plate is provided in the axial direction, and a wrap of the one scroll is provided on the end plate so as to face the one scroll. A wrap part wound in a spiral shape from the inner diameter side to the outer diameter side to define a plurality of compression chambers overlapping with the part, and the other scroll is provided in an axial direction, In the scroll type fluid machine in which a plurality of protrusions extending in the axial direction with an interval in the spiral direction are provided on the peripheral surface of the wrap portion of the scroll,
The plurality of protrusions are formed so that at least some of them are non-equally spaced;
The plurality of projections are arranged such that at least one of the plurality of locations where the other scroll is closest to the one scroll does not always have the projection. Scroll type fluid machine.   2. The scroll fluid machine according to claim 1, wherein each of the protrusions is configured such that an angle formed between adjacent protrusions is different between an inner diameter side and an outer diameter side of the wrap portion.   The protrusions are formed on the outer peripheral surface of the wrap portion of the one scroll and the outer peripheral surface of the wrap portion of the other scroll, respectively, and the protrusion of the one scroll and the protrusion of the other scroll are positioned in the spiral direction. The scroll fluid machine according to claim 1, wherein the scroll fluid machines are configured to be shifted from each other.   The protrusions are respectively formed on an inner peripheral surface of the wrap portion of the one scroll and an inner peripheral surface of the wrap portion of the other scroll, and the protrusion of the one scroll and the protrusion of the other scroll are in a spiral direction. The scroll fluid machine according to claim 1, wherein the scroll fluid machine is configured such that positions thereof are shifted from each other.   The protrusions are formed on an inner peripheral surface and an outer peripheral surface of the wrap portion of the one scroll, respectively, and the protrusions on the inner peripheral surface and the protrusions on the outer peripheral surface are arranged so that their positions in the spiral direction are shifted from each other. The scroll fluid machine according to claim 1.   The scroll fluid machine according to claim 1, 2, 3, 4 or 5, wherein an angle between the protrusions is formed smaller on the outer diameter side than on the inner diameter side in the spiral direction of the wrap portion.   The scroll type fluid machine according to claim 1, 2, 3, 4 or 5, wherein the angle between the protrusions is gradually decreased from the inner diameter side to the outer diameter side in the spiral direction of the wrap portion.   Each of the protrusions is formed only on the inner diameter side in the spiral direction of the wrap portion, and a non-projection forming portion is provided on the outer diameter side of the wrap portion. 8. A scroll fluid machine according to 7.   The non-projection forming portion of the wrap portion is a portion extending approximately one turn from the compression start position where the wrap portion of the one scroll and the wrap portion of the other scroll are closest to the outer diameter side toward the inner diameter side. The scroll fluid machine according to claim 8.   The largest interval among the projections positioned at one turn of the innermost diameter of the wrap portion is defined as the maximum spacing on the inner diameter side, and the largest of the intervals between the projections positioned at one turn of the outermost diameter of the wrap portion. The maximum distance on the outer diameter side is formed larger than the maximum distance on the inner diameter side when the distance is the maximum distance on the outer diameter side. The scroll fluid machine according to 8 or 9.

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