JP2009047089A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability by lengthening the service life of a flange part and a seal member, by preventing contact of the flange part of opposed respective scrolls. <P>SOLUTION: A plurality of contact preventive projections 28 projecting in the axial direction toward the flange part 19 of a turning scroll 16, are arranged on an opposed surface 15A of the flange part 15 of a fixed scroll 11. Thus, even when behavior of the turning scroll 16 is unstable, for example, due to a low pressure of a compression space 22, the respective contact preventive projections 28 can prevent the flange part 19 from contacting with the opposed surface 15A of the flange part 15 of the fixed scroll 11 by abutting on an opposed surface 19A of the flange part 19 of the turning scroll 16. Thus, a seal sliding contact area S of the opposed surface 15A of the flange part 15 is held in an undamaged excellent state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  In general, a scroll type fluid machine includes, for example, a fixed scroll and a turning scroll, and these scrolls are configured such that a spiral wrap portion is erected on its end plate. Then, by arranging the fixed scroll and the orbiting scroll so as to face each other, the two lap portions are overlapped to define a plurality of compression chambers. In this state, the orbiting scroll is reciprocated with respect to the fixed scroll to continuously reduce the compression chamber to compress the air or the like, and discharge the compressed air having the set pressure to an external air tank or the like.

  Here, when the orbiting scroll is revolving with respect to the fixed scroll, the pressure of each compression chamber pushes the orbiting scroll in a direction away from the fixed scroll in the axial direction. As a result, the scroll fluid machine forms a predetermined gap between the outer peripheral side flange portion of the fixed scroll and the flange portion positioned on the outer peripheral side of the end plate of the orbiting scroll facing the flange portion. The flange portion and the flange portion of the orbiting scroll are in contact with each other so as not to be damaged.

  However, when a gap is formed between the flange portion of the fixed scroll and the flange portion of the orbiting scroll, the lubricating oil and dust enter the compression chamber from this gap. For this reason, in the scroll type fluid machine according to the prior art, an annular seal member is provided on the outer peripheral edge of the flange portion of the orbiting scroll, and the front end side of this seal member is slidably pushed on the opposed surface of the flange portion of the fixed scroll. By attaching, lubricating oil and dust are prevented from entering the compression chamber through the gap between the flange portion of the fixed scroll and the flange portion of the orbiting scroll (see, for example, Patent Document 1).

JP 2000-337275 A

  By the way, in the above-described prior art disclosed in Patent Document 1, for example, when the pressure on the air tank side is low, or when the set pressure of the compressed air to be discharged is low, the pressure in the compression chamber is low. It cannot be separated sufficiently. For this reason, the orbiting scroll rattles and the behavior becomes unstable, and the outer peripheral edge of the flange portion of the orbiting scroll may come into contact with the opposing surface of the flange portion of the fixed scroll.

  In addition, when the orbiting scroll is rotated in the reverse direction, the compression chamber has a negative pressure. Similarly, the outer peripheral edge of the flange portion of the orbiting scroll may come into contact with the opposing surface of the flange portion of the fixed scroll.

  Thus, when the outer peripheral edge of the flange portion of the orbiting scroll comes into contact with the facing surface of the flange portion of the fixed scroll, the facing surface of the flange portion is damaged, and its fragments, wear powder, etc. are mixed into the compressed air. There's a problem. Moreover, even if the scratch on the facing surface of the flange portion is small, the facing surface is a sliding surface of the seal member. If any scratch is found, the seal member may be worn out quickly or damaged. There is a problem that the sealing performance is lowered.

  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 prevent the flange portions of each scroll from coming into contact with each other, thereby extending the service life of the flange portions and the seal member. It is an object of the present invention to provide a scroll fluid machine that can be improved.

  In the scroll type fluid machine according to the present invention, two scrolls each having a lap portion standing on the end plate are provided to face each other, and a plurality of compression chambers are defined between the lap portions of the two scrolls.

  In order to solve the above-described problems, the invention adopts the feature of the configuration of claim 1 in that each of the scrolls is provided with flange portions facing each other and positioned on a radially outer side than the wrap portion. A sealing member is provided in one of the flanges, the seal member sealing the gap between the flanges by being in sliding contact with the opposing surface of the other flange, the one flange being the other flange The contact prevention means for preventing contact with the sliding contact portion of the seal member is provided.

  According to a second aspect of the present invention, the contact preventing means is formed as a protrusion provided in the flange portion so as to protrude in the axial direction.

  According to a third aspect of the present invention, the contact prevention means is configured to be arranged at a plurality of locations separated in the circumferential direction of the flange portion.

  The invention of claim 4 is that the contact preventing means is formed using the same material as the flange portion.

  The invention according to claim 5 is that the contact preventing means is configured by providing the flange portion with a material softer than a base material forming the flange portion.

  The invention according to claim 6 is that the contact preventing means is configured by coating the flange portion with a material softer than a base material forming the flange portion.

  According to a seventh aspect of the present invention, the contact preventing means is constituted by a ball receiving groove formed in the flange portion and a ball that is rotatably accommodated so as to partially protrude into the ball receiving groove. It is in.

  The invention according to claim 8 is that the contact preventing means is constituted by a seal projection protruding from the seal member toward the other flange.

  According to the invention of claim 1, each scroll is provided with a flange portion that is located radially outside the wrap portion and faces each other, and one of the flange portions has the other flange portion with the other flange portion. A seal member is provided that is in sliding contact with the opposing surface of the flange portion and seals the gap between the flange portions. On this, contact prevention means for preventing one flange portion from contacting the sliding contact portion of the seal member of the other flange portion is provided.

  Therefore, for example, even if the pressure in the compression chamber is low and one of the scrolls rattles and the behavior becomes unstable, the contact prevention means is provided with the flange portion of one scroll provided on the flange portion of the other scroll. It is possible to prevent contact with the sliding contact portion of the sealing member.

  As a result, the other flange portion can maintain the sliding contact portion of the seal member in a good state without scratches, so that the life of the flange portion and the seal member can be extended, and the reliability of the scroll type fluid machine can be increased. Can be improved.

  According to the invention of claim 2, since the contact preventing means is formed as a protrusion provided in the flange portion so as to protrude in the axial direction, the rattling of one scroll is reduced by the protrusion dimension of the protrusion. Can do. Accordingly, the protrusion can prevent one flange portion from coming into contact with the sliding contact portion of the seal member of the other flange portion. Further, it is possible to prevent the wrap portion of each scroll from being squeezed.

  According to the invention of claim 3, since the contact preventing means is arranged at a plurality of locations apart in the circumferential direction of the flange portion, it can be accurately processed with simple processing as compared with the case where it is formed on the entire circumference. Contact prevention means can be provided.

  According to the invention of claim 4, when the contact preventing means is formed using the same material as the flange portion, for example, the contact preventing means can be easily processed as a part of the flange portion.

  According to the invention of claim 5, since the contact preventing means is formed by providing the flange portion with a softer material than the base material forming the flange portion, the soft contact preventing means and the one flange portion Can be smoothly contacted. Thereby, damage and wear of the flange portion can be prevented, and mechanical loss can be reduced.

  According to the invention of claim 6, since the contact preventing means is formed by coating the flange portion with a material softer than the base material forming the flange portion, the contact preventing means can be easily formed. it can. Further, the soft contact preventing means can prevent the flange portion from being damaged and worn, and can also reduce the mechanical loss.

  According to the seventh aspect of the present invention, the contact preventing means comprises a ball receiving groove formed in the flange portion, and a ball that is rotatably accommodated so as to partially protrude into the ball receiving groove. Therefore, it is possible to minimize the mechanical loss due to the contact between the ball and the flange portion and improve the operation efficiency.

  According to the eighth aspect of the present invention, since the contact preventing means is formed as a seal projection protruding from the seal member toward the other flange portion, it is only necessary to attach the seal member without processing the flange portion. A seal projection that projects toward the other flange can be easily provided.

  Hereinafter, a scroll-type air compressor integrated with a motor will be described as an example of a scroll-type fluid machine according to an embodiment of the present invention and will be described in detail with reference to the accompanying drawings.

  1 to 5 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a casing constituting an outer frame of a scroll type air compressor. The casing 1 has a bottomed cylindrical shape that is open on one side in the axial direction, and is integrally formed on the lower side of the motor case 2 that houses an electric motor 6 to be described later, and is cooled and lubricated. An oil tank 3 for storing the oil liquid for use and a thrust receiver 4 provided on one side (opening side) of the motor case 2 are roughly constituted. The periphery of the casing 1 is covered with a duct 5 for circulating cooling air.

  Here, the thrust receiver 4 is provided with a lid portion 4A that covers the opening side of the motor case 2 and an annular recess 4B that is disposed in a state in which the end plate 17 of the orbiting scroll 16 described later is in sliding contact. . The annular recess 4B of the thrust receiver 4 receives a thrust load acting on the orbiting scroll 16, and a receiving plate 4C is provided at a portion of the orbiting scroll 16 where the end plate 17 slides. The thrust load acting on the orbiting scroll 16 is a load when the pressure of each compression chamber 22 described later pushes the orbiting scroll 16 in a direction away from the fixed scroll 11 in the axial direction.

  6 is an electric motor provided in the motor case 2 of the casing 1, and the electric motor 6 is attached to a substantially cylindrical stator 6 </ b> A fixed to the inner peripheral side of the motor case 2 and a drive shaft 7 described later. The rotor 6B is rotatably arranged on the inner peripheral side of the stator 6A. The electric motor 6 rotates the drive shaft 7 by being supplied with power from the outside, and causes a turning scroll 16 (described later) attached to the crank 7A to turn.

  A drive shaft 7 is rotatably provided on the casing 1. One side of the drive shaft 7 is supported on the lid portion of the motor case 2 via a bearing 8, and the other side in the axial direction is supported on the lid portion 4 </ b> A of the thrust receiver 4 via a bearing 9. A cooling fan 10 for supplying cooling air into the duct 5 is attached to the protruding end on one side of the drive shaft 7. On the other hand, the other end side of the drive shaft 7 protruding from the lid portion 4 </ b> A of the thrust receiver 4 is a crank 7 </ b> A that is eccentric by a certain dimension with respect to the rotation center of the drive shaft 7.

  Next, the fixed scroll 11, the orbiting scroll 16, the contact prevention protrusion 28, etc. that constitute the main part of the scroll type air compressor will be described.

  First, reference numeral 11 denotes a fixed scroll provided on the thrust receiver 4 of the casing 1. The fixed scroll 11 is formed using a metal material such as an aluminum alloy material or iron material as a base material. The fixed scroll 11 surrounds the disc-shaped end plate 12 arranged coaxially with the drive shaft 7, the spiral wrap portion 13 standing on the surface of the end plate 12, and the wrap portion 13. A cylindrical portion 14 extending in the axial direction from the outer peripheral side of the end plate 12 toward the orbiting scroll 16, and an annular flange portion 15 serving as the other flange portion protruding radially outward from the distal end side of the cylindrical portion 14; It is roughly constituted by. Further, a tip seal 13A (see FIG. 3) for sealing between the end of the wrap portion 13 and the end plate 17 of the orbiting scroll 16, which will be described later, is mounted along a spiral shape.

  Here, the annular flange portion 15 is positioned on the outer side in the radial direction from the lap portion 13, and the surface side is a facing surface 15 </ b> A that faces the flange portion 19 of the orbiting scroll 16. Further, in the facing surface 15A of the flange portion 15, an annular region indicated by hatching in FIG. 2 becomes a seal sliding contact region S as a sliding contact portion to which a lip seal 25 described later is slidably contacted, and there is no unevenness or scratches. Finished on the finished surface. Further, a contact prevention protrusion 28 described later is integrally provided on the opposed surface 15A of the flange portion 15 on the inner side in the radial direction from the seal sliding contact region S.

  Reference numeral 16 denotes a turning scroll provided in the casing 1 so as to be turnable on the drive shaft 7. Similar to the fixed scroll 11, the orbiting scroll 16 is formed using a metal material such as an aluminum alloy material or an iron material as a base material. The orbiting scroll 16 includes a disc-shaped end plate 17, a spiral wrap portion 18 erected on the surface of the end plate 17, and a radially outer side than the wrap portion 18 on the outer peripheral side of the end plate 17. And a cylindrical boss 20 projecting from the center of the rear surface of the end plate 17.

  A tip seal 18A (see FIG. 3) that seals between the end of the wrap portion 18 of the orbiting scroll 16 and the end plate 12 of the fixed scroll 11 is attached along a spiral shape. On the other hand, the boss portion 20 is rotatably attached to the crank 7 </ b> A of the drive shaft 7 via the swivel bearing 21.

  Further, the flange portion 19 of the orbiting scroll 16 is provided with a facing surface 19A that faces the facing surface 15A of the flange portion 15 of the fixed scroll 11 in the axial direction. Here, the pressure of each compression chamber 22 to be described later acts on the orbiting scroll 16 in a direction away from the fixed scroll 11 in the axial direction, and the orbiting scroll 16 that has received this pressure is pressed against the thrust receiver 4. Rotating operation is stable.

  In addition, when the orbiting scroll 16 is pressed against the thrust receiver 4, a predetermined gap G is formed between the facing surface 15 </ b> A of the flange portion 15 of the fixed scroll 11 and the facing surface 19 </ b> A of the flange portion 19 of the orbiting scroll 16. Is formed. The gap G is appropriately set according to the size of the scroll fluid machine, the set pressure, and the like. In the first embodiment, the case where the gap G is about 100 μm is described as an example.

  The wrap portion 18 of the orbiting scroll 16 is disposed so as to overlap with the wrap portion 13 of the fixed scroll 11 with a shift of 180 degrees, for example, and a plurality of compression chambers 22 are defined between the wrap portions 13 and 18. It is made. Thus, the scroll type air compressor sequentially moves the air sucked into the outer compression chambers 22 from the suction ports 23 (shown in FIG. 2) in the respective compression chambers 22 as the orbiting scroll 16 performs the orbiting motion. While compressing, compressed air is discharged from the compression chamber 22 on the center side to an external air tank (not shown) through the discharge port 24.

  Reference numeral 25 denotes a lip seal as a seal member provided on the outer peripheral side of the flange portion 19 of the orbiting scroll 16. As shown in FIG. 5, the lip seal 25 is formed as a cylindrical body having a L-shaped cross section using a metal material, and a metal core 26 fitted and attached to the outer peripheral side of the flange portion 19. The elastic seal 27 is integrally fixed to the outer peripheral side of 26.

  The elastic seal 27 is such that the outer peripheral lip portion 27 </ b> A extends obliquely toward the flange portion 15 of the fixed scroll 11 and comes into sliding contact with the facing surface 15 </ b> A of the flange portion 15. The range of the facing surface 15A where the lip portion 27A is in sliding contact is an annular seal sliding contact region S indicated by hatching in FIG.

  The lip seal 25 prevents the lubricating oil, dust, etc. from entering the compression chamber 22 side by pressing the lip portion 27A of the elastic seal 27 against the facing surface 15A of the flange portion 15 of the fixed scroll 11. Is.

  Reference numeral 28 denotes a plurality of contact prevention protrusions as contact prevention means provided on the flange portion 15 of the fixed scroll 11. The contact prevention protrusions 28 are two, three, four, five or more at predetermined intervals in the circumferential direction, and preferably have dimension management, arrangement balance, processing time, cost, etc. as shown in FIG. Are provided at intervals of approximately 120 degrees. Each contact prevention protrusion 28 prevents the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 from coming into contact with the facing surface 15 </ b> A (the seal sliding contact region S) of the flange portion 15 of the fixed scroll 11.

  Here, the three contact prevention protrusions 28 are disposed on the inner diameter side of the seal sliding contact region S of the flange portion 15, and as shown in FIGS. 3 and 4, the shafts face the flange portion 19 of the orbiting scroll 16. It is formed as an arc-shaped protrusion protruding in the direction. Each contact prevention protrusion 28 is formed using the same material as a base material which forms flange part 15 (fixed scroll 11), ie, metal materials, such as aluminum alloy material and iron material. In the first embodiment, each contact prevention projection 28 is integrally provided on the facing surface 15 </ b> A as a part of the flange portion 15.

  Further, as shown in FIG. 5, each contact prevention protrusion 28 protrudes from the facing surface 15A of the flange portion 15 with a protrusion dimension H1. Even when the orbiting scroll 16 is inclined to the maximum (rattle), the protrusion dimension H1 is before the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 contacts the facing surface 15A of the flange portion 15 of the fixed scroll 11. The dimension is set so as to contact the flange portion 19 of the orbiting scroll 16 and prevent further inclination. Specifically, when the gap G between the facing surface 15A of the flange portion 15 of the fixed scroll 11 and the facing surface 19A of the flange portion 19 of the orbiting scroll 16 is 100 μm, the protrusion dimension H1 of each contact prevention protrusion 28 is, for example, The gap G is set to 50 to 70 μm, which is about 30 to 80%, preferably about 50 to 70%.

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

  First, when the drive shaft 7 is rotationally driven by the electric motor 6, the orbiting scroll 16 orbits with respect to the fixed scroll 11, and the compression chambers 22 defined between the wrap portions 13 and 18 of the scrolls 11 and 16. Continuously shrink from the radially outer side to the inner side. Thereby, the air sucked into the compression chambers 22 on the outer peripheral side from the suction ports 23 of the fixed scroll 11 is sequentially compressed in the respective compression chambers 22, and the external air tank ( (Not shown).

  Further, during the compression operation described above, the orbiting scroll 16 is pushed in the axial direction by the pressure of each compression chamber 22, and the flange portion 19 of the orbiting scroll 16 is pressed against the receiving plate 4 </ b> C of the thrust receiver 4. As a result, the orbiting scroll 16 can stably orbit with respect to the fixed scroll 11 while forming a predetermined gap G between the orbiting scroll 16 and the flange portion 15 of the fixed scroll 11.

  However, when the compression operation conditions, for example, when the pressure on the air tank side is low, or when the set pressure of the compressed air to be discharged is low, the pressure of each compression chamber 22 is low, so the orbiting scroll 16 is placed on the thrust receiver 4 side. Can not be pressed sufficiently. If the orbiting scroll 16 is orbited in this state, the behavior becomes unstable and the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 may come into contact with the facing surface 15A of the flange portion 15 of the fixed scroll 11. is there.

  Further, when the orbiting scroll 16 is rotated in reverse, the compression chamber 22 becomes negative pressure. Similarly, the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 is opposed to the facing surface 15A of the flange portion 15 of the fixed scroll 11. There is a risk of contact.

  At this time, each contact prevention protrusion 28 contacts the flange portion 19 of the orbiting scroll 16 before the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 contacts the facing surface 15A of the flange portion 15 of the fixed scroll 11. Thus, the orbiting scroll 16 is prevented from further tilting so that the flange portion 19 of the orbiting scroll 16 does not come into contact with the facing surface 15A of the flange portion 15 of the fixed scroll 11.

  Thus, according to the first embodiment, the three contact prevention protrusions 28 that protrude in the axial direction toward the flange portion 19 of the orbiting scroll 16 are formed on the facing surface 15A of the flange portion 15 of the fixed scroll 11. It is set as the structure which provides. Therefore, for example, even if the pressure of the compression chamber 22 is low and the orbiting scroll 16 rattles and the behavior becomes unstable, the contact prevention protrusions 28 have the flange portions 19 of the orbiting scroll 16 and the flanges of the fixed scroll 11. Contact with the seal sliding contact region S provided on the facing surface 15A of the portion 15 can be prevented.

  As a result, the flange portion 15 of the fixed scroll 11 can maintain the seal sliding contact region S of the opposing surface 15A in a good state without scratches. Therefore, the opposing surface 15A of the flange portion 15 or the opposing surface 15A. The life of the lip seal 25 that comes into sliding contact with each other can be extended, and the reliability of the scroll fluid machine can be improved.

  Further, each contact prevention protrusion 28 is provided on the opposing surface 15A of the flange portion 15 of the fixed scroll 11 so as to protrude in the axial direction, so that the orbiting scroll 16 is less rattling by the protrusion dimension H1 of the protrusion 28. can do. Thereby, each contact prevention protrusion 28 can prevent the flange part 19 of the turning scroll 16 from contacting the flange part 15 of the fixed scroll 11.

  In addition, each contact prevention protrusion 28 prevents galling between the wrap portions 13 and 18 of the scrolls 11 and 16, and also prevents contact failure and uneven wear of the tip seals 13A and 18A attached to the tips of the wrap portions 13 and 18. can do. Thereby, the compression leak from between the lap | wrap parts 13 and 18 can be prevented, and compression efficiency can be improved.

  On the other hand, since the contact prevention protrusions 28 are arranged in three locations apart in the circumferential direction of the flange portion 15 of the fixed scroll 11, compared with the case where it is formed on the entire circumference, the time required for dimension management and processing, Costs and the like can be improved, and each contact prevention protrusion 28 can be easily formed. Further, the three contact prevention protrusions 28 can contact the flange portion 19 of the orbiting scroll 16 with good balance.

  Furthermore, since each contact prevention protrusion 28 is formed using a metal material such as an aluminum alloy material or iron material which is the same material as the flange portion 15 of the fixed scroll 11, the contact prevention protrusion 28 is connected to the flange portion 15. It can be formed integrally and can be provided by simple processing.

  Next, FIG. 6 and FIG. 7 show a second embodiment of the present invention. A feature of the second embodiment is that the contact preventing means is configured by providing a material softer than the base material forming the flange portion on the flange portion. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 6, reference numeral 31 denotes a contact preventing member fitting groove provided in the flange portion 15 of the fixed scroll 11. The fitting groove 31 accommodates a contact prevention member 32 described later in a fitted state, and is provided at a plurality of positions with a predetermined interval in the circumferential direction, preferably dimensional management, arrangement balance, processing time, cost, etc. In consideration, for example, it is provided at three locations at intervals of approximately 120 degrees. Moreover, each contact prevention member fitting groove | channel 31 is arrange | positioned rather than the seal | sticker sliding contact area | region S of the flange part 15, and as shown in FIG. 7, it is formed as an arc-shaped recessed groove.

  Reference numeral 32 denotes a contact prevention member as a contact prevention means provided on the flange portion 15 of the fixed scroll 11. This contact prevention member 32 is provided in the circumferential direction for the same reason as the contact prevention protrusion 28 according to the first embodiment. A plurality of, for example, three (only one is shown) are provided at intervals. Each contact prevention member 32 is formed by curving a rectangular column having a quadrangular cross section into an arc shape, and is accommodated in three contact prevention member fitting grooves 31 in a fitted state. Each contact prevention member 32 prevents the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 from coming into contact with the facing surface 15 </ b> A of the flange portion 15 of the fixed scroll 11.

  Further, the three contact prevention members 32 are arranged on the inner diameter side of the seal sliding contact region S of the flange portion 15 and turn in a state of being fitted in the contact prevention member fitting groove 31 as shown in FIG. A projection is formed protruding in the axial direction toward the flange portion 19 of the scroll 16. Further, each contact preventing member 32 is made of a base material that forms the flange portion 15 (fixed scroll 11), that is, a material softer than a metal material such as an aluminum alloy material or an iron material, such as polytetrafluoroethylene (PTFE). It is formed using a resin composite material.

  Here, each contact preventing member 32 protrudes from the facing surface 15A of the flange portion 15 with a protruding dimension H2. Since the contact prevention member 32 is formed of a resin material that can be deformed with good slidability, the protruding dimension H2 is equal to the facing surface 15A of the flange portion 15 of the fixed scroll 11 and the flange portion 19 of the orbiting scroll 16. The dimension is set to the same size as the gap G with the opposing surface 19A.

  Accordingly, each contact preventing member 32 can substantially eliminate the gap with the flange portion 19 of the orbiting scroll 16, so that the orbiting scroll 16 can be prevented from rattling and stably operated. Further, the contact preventing member 32 made of a soft resin material protrudes by deforming even when the protruding dimension H2 is larger than the gap G between the flange portion 15 of the fixed scroll 11 and the flange portion 19 of the orbiting scroll 16. The dimensions can be adjusted to optimum values.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the second embodiment, the contact prevention member 32 is formed of a resin material that is softer than a metal material that is a base material that forms the flange portion 15 of the fixed scroll 11. Can be smoothly brought into contact with the flange portion 19 of the orbiting scroll 16. Thereby, damage and abrasion of the flange portion 19 can be prevented, and mechanical loss due to contact can be reduced.

  In the second embodiment, the contact prevention member fitting groove 31 is provided in the flange portion 15 of the fixed scroll 11, and the contact prevention member 32 is fitted and attached to the contact prevention member fitting groove 31. Since the configuration is adopted, the contact preventing member 32 can be easily provided only by performing simple cutting on the existing scroll type air compressor.

  Next, FIG. 8 shows a third embodiment of the present invention. The feature of the third embodiment resides in that the contact preventing means is configured by coating the flange portion with a material softer than the base material forming the flange portion. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 8, reference numeral 41 denotes a contact prevention film as a contact prevention means provided on the flange portion 19 of the orbiting scroll 16. The contact prevention film 41 prevents the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 from coming into contact with the opposing surface 15A of the flange portion 15 of the fixed scroll 11, and the entire circumference of the opposing surface 19A of the flange portion 19 or It is provided at a plurality of locations at intervals in the circumferential direction.

  The contact prevention film 41 is made of a material softer than a metal material such as an aluminum alloy material or iron material forming the flange portion 19 of the orbiting scroll 16, for example, a material containing molybdenum disulfide, graphite, fluorine-based resin, or the like. It is formed by coating 19 opposing surfaces 19A. Further, the contact prevention film 41 forms a protrusion protruding in the axial direction from the facing surface 19 </ b> A of the flange portion 19 of the orbiting scroll 16 toward the flange portion 15 of the fixed scroll 11.

  Thereby, when the orbiting scroll 16 rattles, the contact prevention film 41 can come into contact with the facing surface 15A of the flange portion 15 of the fixed scroll 11 before the outer peripheral edge of the flange portion 19, It is possible to prevent the flange portion 19 of the orbiting scroll 16 from coming into contact with the facing surface 15 </ b> A of the flange portion 15 of the fixed scroll 11.

  Thus, also in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the third embodiment, a material softer than the base material forming the flange portion 19 of the orbiting scroll 16, for example, a material containing molybdenum disulfide, graphite, fluorine resin, or the like is used. The contact-preventing film 41 can be provided by coating. Thereby, the contact prevention film | membrane 41 can be formed easily. Further, the soft contact prevention film 41 can prevent damage and wear of the flange portion 15 of the fixed scroll 11, and can reduce the mechanical loss and increase the operation efficiency. A similar contact prevention film 41 may be coated on the flange portion 15 of the fixed scroll 11.

  Next, FIG. 9 shows a fourth embodiment of the present invention. The feature of the fourth embodiment is that the contact preventing means is composed of a ball housing groove formed in the flange portion and a ball housed so as to be able to roll so as to partially protrude into the ball housing groove. It is to have done. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 9, reference numeral 51 denotes a contact prevention mechanism as a contact prevention means provided on the flange portion 15 of the fixed scroll 11. For the same reason as the contact prevention protrusion 28 according to the first embodiment, the contact prevention mechanism 51 is provided at a plurality of places, for example, three places (only one place is shown) at intervals in the circumferential direction. The contact prevention mechanism 51 prevents the outer peripheral edge of the flange portion 19 of the orbiting scroll 16 from coming into contact with the facing surface 15 </ b> A of the flange portion 15 of the fixed scroll 11. The contact prevention mechanism 51 includes a ball receiving groove 52 formed as a recessed portion having a flat bottom surface, and a ball 53 that is rotatably accommodated in the ball receiving groove 52.

  Here, each contact prevention mechanism 51 forms a protrusion protruding in the axial direction toward the flange portion 19 of the orbiting scroll 16 by causing the ball 53 to protrude from the ball receiving groove 52. The projecting dimension of the ball 53 at this time is smaller than, for example, the gap G between the opposed surfaces 15A and 19A of the flange portions 15 and 19 of the scrolls 11 and 16 described above, preferably slightly smaller (about 70 to 99%). ) The dimensions are set.

  Then, when the orbiting scroll 16 rattles, the contact prevention mechanism 51 abuts the protruding ball 53 against the facing surface 19A of the flange portion 19 so that the flange portion 19 of the orbiting scroll 16 is fixed to the fixed scroll 11. Contact with the facing surface 15A of the flange portion 15 is prevented. Further, the contact preventing mechanism 51 reduces the frictional resistance at this time by rolling the ball 53 corresponding to the turning motion of the turning scroll 16.

  Thus, also in the fourth embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the fourth embodiment, the contact prevention mechanism 51 can freely roll so that a ball housing groove 52 formed in the flange portion 15 of the fixed scroll 11 and a part of the ball housing groove 52 protrudes. Since it comprises the ball 53 accommodated, the mechanical loss due to the contact between the ball 53 and the flange portion 19 can be minimized, and the operation efficiency can be improved. A similar ball receiving groove 52 may be provided in the flange portion 19 of the orbiting scroll 16 and the ball 53 may be received in the ball receiving groove 52.

  Next, FIG. 10 shows a fifth embodiment of the present invention. The feature of the fifth embodiment resides in that the contact preventing means is constituted by a seal protrusion protruding from the seal member toward the other flange. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 10, reference numeral 61 denotes a lip seal as a seal member according to the fifth embodiment used in place of the lip seal 25 according to the first embodiment. The lip seal 61 is integrally fixed to the outer peripheral side of the core metal 62 and a core metal 62 made of a cylindrical body having an L-shaped cross section, and the tip side is substantially the same as the lip seal 25 according to the first embodiment. The elastic seal 63 is generally constituted by a lip portion 63A that is in sliding contact with the facing surface 15A of the flange portion 15.

  However, the lip seal 61 according to the fifth embodiment is different from the lip portion 63A of the elastic seal 63 in that it forms a seal protrusion 64 described later that protrudes toward the inner diameter side. It is different from the lip seal 25.

  That is, 64 is a seal projection provided as a contact preventing means provided on the lip seal 61. The seal protrusion 64 is provided integrally with the elastic seal 63 and protrudes toward the flange portion 15 of the fixed scroll 11. Specifically, the seal protrusion 64 is arranged at a position covering the outer peripheral edge side of the facing surface 19A of the flange portion 19 of the orbiting scroll 16 by separating from the lip portion 63A extending to the outer diameter side and extending to the inner diameter side. Yes. Further, the seal protrusions 64 are provided at a plurality of locations with intervals in the entire circumference or circumferential direction of the lip seal 61.

  Thereby, even when the orbiting scroll 16 rattles, the seal protrusion 64 covers the outer peripheral edge of the flange portion 19, so that the flange portion 19 of the orbiting scroll 16 faces the flange portion 15 of the fixed scroll 11. The contact with the surface 15A can be prevented.

  Thus, also in the fifth embodiment configured as described above, it is possible to obtain substantially the same function and effect as those of the first embodiment described above. In particular, in the fifth embodiment, the lip seal 61 is provided with a seal protrusion 64 that protrudes so as to cover the outer peripheral edge side of the facing surface 19A of the flange portion 19 of the orbiting scroll 16.

  Therefore, it is not necessary to process the flange portion 19, and the outer peripheral edge side of the facing surface 19 </ b> A of the flange portion 19 of the orbiting scroll 16 can be covered with the seal protrusion 64 simply by attaching the lip seal 61. As a result, the existing scroll type air compressor can be provided with the seal projection 64 that makes contact prevention means easily and inexpensively.

  In the first embodiment, the case where a plurality of contact prevention protrusions 28 are provided at a predetermined interval in the circumferential direction has been described as an example. However, the present invention is not limited to this. For example, one contact prevention protrusion 28 having an annular shape or a C shape may be provided. This configuration can be similarly applied to other embodiments.

  In each of the embodiments, a scroll-type air compressor integrated with a motor has been described as an example of the scroll-type fluid machine. However, the present invention is not limited to this, and for example, a scroll-type air compressor with a separate motor is used. The present invention may be applied and can be widely applied to vacuum pumps, refrigerant compressors, and the like.

It is a longitudinal section showing a scroll type air compressor by a 1st embodiment of the present invention. It is a front view which shows a fixed scroll alone. It is sectional drawing of the principal part expansion which expands and shows the A section in FIG. It is a perspective view of the principal part expansion which expands the B section in FIG. 2, and shows a contact prevention protrusion. FIG. 4 is an enlarged cross-sectional view of a main part showing a contact prevention protrusion, each flange part and the like by enlarging a C part in FIG. 3. It is sectional drawing of the principal part expansion which looked at the contact prevention protrusion by the 2nd Embodiment of this invention from the same position as FIG. FIG. 7 is an enlarged perspective view of a main part of the contact prevention protrusion and the like in FIG. It is sectional drawing of the principal part expansion which looked at the contact prevention film by the 3rd Embodiment of this invention from the same position as FIG. It is sectional drawing of the principal part expansion which looked at the contact prevention mechanism by the 4th Embodiment of this invention from the same position as FIG. It is sectional drawing of the principal part expansion which looked at the seal projection part by the 5th Embodiment of this invention from the same position as FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fixed scroll 12, 17 End plate 13, 18 Lapping part 14 Tube part 15, 19 Flange part 15A, 19A Opposing surface 16 Orbiting scroll 22 Compression chamber 25, 61 Lip seal (seal member)
26, 62 Metal core 27, 63 Elastic seal 28 Contact prevention protrusion (contact prevention means)
32 Contact prevention member (contact prevention means)
41 Contact prevention coating (contact prevention means)
51 Contact prevention mechanism (contact prevention means)
52 Ball receiving groove 53 Ball 64 Seal protrusion (contact prevention means)
G Gap size between opposing faces of each flange part S Seal sliding contact area (sliding contact part)
H1 Protrusion dimension of contact prevention protrusion H2 Protrusion dimension of contact prevention member

Claims (8)

In a scroll type fluid machine in which two scrolls each provided with a lap portion standing on the end plate are provided facing each other, and a plurality of compression chambers are defined between the two scroll lap portions.
Each of the scrolls is provided with flange portions facing each other and positioned on the outer side in the radial direction than the wrap portion,
One flange portion of each flange portion is provided with a seal member that is in sliding contact with the opposite surface of the other flange portion and seals the gap between the flange portions,
A scroll type fluid machine comprising a contact prevention means for preventing the one flange portion from contacting a sliding contact portion of a seal member of the other flange portion.   The scroll type fluid machine according to claim 1, wherein the contact preventing means is formed as a protrusion provided in the flange portion so as to protrude in the axial direction.   3. The scroll fluid machine according to claim 1, wherein the contact prevention means is configured to be disposed at a plurality of locations separated in a circumferential direction of the flange portion.   The scroll fluid machine according to claim 1, 2 or 3, wherein the contact preventing means is formed using the same material as the flange portion.   4. The scroll fluid machine according to claim 1, wherein the contact prevention means is configured by providing a material softer than a base material forming the flange portion on the flange portion.   4. The scroll fluid machine according to claim 1, wherein the contact preventing means is configured by coating the flange portion with a material softer than a base material forming the flange portion.   The contact prevention means is configured by a ball receiving groove formed in the flange portion and a ball that is rotatably accommodated so that a part of the ball receiving groove protrudes into the ball receiving groove. 4. A scroll fluid machine according to 3.   4. The scroll fluid machine according to claim 1, wherein the contact prevention means is configured by a seal projection protruding from the seal member toward the other flange. 5.

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