JP2012163114A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine in which sealing property is improved and frictional resistance during operation is reduced, by making proper pressing force of a sealing member to the end plate of a counterpart over the full length thereof.SOLUTION: A chip seal 20 is provided with a long seal portion 22 protruded to be long in the axial direction to one turn of the outermost diameter side facing the groove bottom surface 7A of a seal groove 7, and a chip seal 25 is provided with a long seal portion 27 in the same way. Thus, the one turn of the outer diameter side of the chip seals 20 and that of the chip seal 25 are made to protrude from the seal grooves 7 and 12 by the respective long seal portions 22 and 27. Accordingly, even when a pressure in a compression chamber 17 at the outer diameter side is low, the long seal portions 22 and 27 push the one turn of the outermost diameter side of the chip seals 20 and 25 onto the end plates 9 and 4, thereby increasing the sealing property. Also, by pushing only the necessary portion of the outer diameter side of the chip seals 20 and 25, the frictional resistance can be made small.

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.

  Generally, a scroll type fluid machine includes two scrolls facing each other, and each scroll has a configuration in which a spiral wrap portion is erected on the bottom surface of its end plate. Then, by arranging the two scrolls to face each other, the two wrap portions overlap each other to define a plurality of compression chambers. In this state, one of the scrolls is swung with respect to the other scroll to continuously reduce the compression chamber to compress air or the like.

  Further, in the scroll type fluid machine according to the prior art, a spiral seal groove is formed in the tooth tip surface of the scroll lap portion, and a seal member that is in sliding contact with the other end plate is mounted in the seal groove. In some cases, the sealing member ensures the airtightness of each compression chamber (see, for example, Patent Document 1 and Patent Document 2).

  In the inventions of Patent Documents 1 and 2, when the seal member is mounted in the seal groove, the bottom surface of the seal member is brought into contact with the bottom surface of the seal groove so that the seal member protrudes from the seal groove. ing. Thus, the seal member is pressed against the other end plate to seal between the tooth tip of the lap portion and the other end plate, thereby improving the airtightness of the compression chamber.

  Furthermore, in the scroll type fluid machine, there is a configuration in which the seal member mounted in the seal groove is lifted using the pressure of the compression chamber to press the seal member against the other end plate (for example, (See Patent Document 3).

JP-A-6-235386 Japanese Patent Laying-Open No. 2005-163671 JP-A-8-93669

  By the way, in the prior art described in Patent Documents 1 and 2 described above, the entire length of the seal member is brought into contact with the groove bottom surface of the seal groove so as to protrude from the seal groove. It will be in the state pressed against the other party's end plate. For this reason, since the frictional resistance between the sealing member and the end plate becomes excessively large, there is a problem that the mechanical loss during the turning operation increases and the compression performance decreases.

  On the other hand, in the prior art described in Patent Document 3, the seal member is lifted by the pressure in the compression chamber, and the seal member is pressed against the other end plate. In this case, since the pressure in the compression chamber located on the outer diameter side is low, the outer diameter side portion of the sealing member cannot be lifted, and contact between the sealing member and the other end plate becomes insufficient, resulting in a sealing property. There is a problem of lowering.

  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 improve the sealing performance by making the pressing force of the sealing member against the other end plate appropriate over the entire length, and to improve the friction. It is an object of the present invention to provide a scroll type fluid machine that can reduce mechanical loss by reducing resistance.

  The scroll type fluid machine according to the present invention includes a scroll having a wrap portion wound in a spiral shape from the inner diameter side to the outer diameter side of the end plate, and one scroll facing the one scroll. The other scroll in which a spiral wrap portion that is provided on the end plate overlaps with the wrap portion of the one scroll is provided in the axial direction, and an opening is formed on the tooth tip surface of at least one of the wrap portions of each scroll. And a spiral seal groove provided in the seal groove and a seal member mounted in the seal groove and slidably in contact with the other end plate.

  In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that a part of the surface facing the groove bottom surface of the seal groove is elongated in the axial direction in the seal member. The long seal portion is provided so as to protrude, and the seal member is configured to protrude from the seal groove by the long seal portion when mounted.

  The invention of claim 2 is that the long seal portion of the seal member is provided on the outer diameter side of the wrap portion.

  According to a third aspect of the present invention, the long seal portion is formed in the range of approximately one turn on the outermost diameter side, and the remaining portion is formed as a short seal portion.

  In order to solve the above-mentioned problem, the feature of the configuration of the invention of claim 4 is that the seal groove is shallow with a part of the surface facing the bottom surface of the seal member being short in the axial direction. A groove portion is provided, and the seal member protrudes from the seal groove by the shallow groove portion when mounted.

  The invention of claim 5 is that the shallow groove portion of the seal groove is provided on the outer diameter side of the wrap portion.

  The invention according to claim 6 is that the seal groove is formed with a shallow groove portion in a range of approximately one turn on the outermost diameter side and the remaining portion as a deep groove portion.

  According to a seventh aspect of the present invention, the seal member is provided with a plurality of lip portions that are formed apart from each other in the length direction of the seal member and are in contact with a bottom surface and / or a side surface of the seal groove. It is in.

  According to the invention of claim 1, the seal member is provided with a long seal portion by projecting a part of the surface facing the groove bottom surface of the seal groove so as to be long in the axial direction. It is configured to protrude from the seal groove by the long seal portion when mounted. Therefore, by making the part where the sealing performance decreases in the entire length of the seal member as a long seal part, this part can be forced to protrude from the seal groove and pressed against the other end plate.

  As a result, since the long seal portion can press only the portion where the sealing performance of the seal member is lowered against the other end plate, the frictional resistance between the seal member and the end plate can be kept small. Sufficient sealing performance can be obtained. Thereby, the pressing force of the seal member against the other end plate can be made appropriate over the entire length, and the frictional resistance can be reduced to reduce the mechanical loss. Further, by improving the sealing performance of the compression chamber, the fluid corresponding to the volume of the compression chamber can be compressed without waste, so that the compression performance can be improved.

  According to the invention of claim 2, by providing the long seal portion of the seal member on the outer diameter side of the wrap portion, the outer diameter side of the seal member where the pressure of the compression chamber is low and the seal member is difficult to float is reduced. , Can be pressed against the end plate of the other party.

  According to the invention of claim 3, since the seal member forms the long seal portion in the range of almost one turn on the outermost diameter side and the remaining portion is formed as the short seal portion, On the inner diameter side where the pressure is high, the short seal part can be lifted by the pressure of the compression chamber entering the seal groove and pressed against the other end plate. On the other hand, in the range of approximately one turn on the outermost diameter side where the pressure in the compression chamber is low and it is difficult to lift the seal member, the long seal portion protruding from the seal groove can be pressed against the opposite end plate.

  According to the invention of claim 4, the seal groove is provided with a shallow groove portion with a part of the surface facing the bottom surface of the seal member being short in the axial direction, and the seal member protrudes from the seal groove by the shallow groove portion when mounted. It is configured to do. Therefore, by making the portion of the total length of the seal groove where the sealing performance of the seal member is reduced to be a shallow groove portion, the shallow groove portion allows the seal member to protrude from the seal groove and be pressed against the opposite end plate.

  As a result, the shallow groove portion can press only the portion where the sealing performance of the sealing member is lowered against the other end plate, so that the frictional resistance between the seal member and the end plate can be kept small and sufficient. Sealability can be obtained. Thereby, the pressing force of the seal member against the other end plate can be made appropriate over the entire length, and the frictional resistance can be reduced to reduce the mechanical loss. Further, by improving the sealing performance of the compression chamber, the fluid corresponding to the volume of the compression chamber can be compressed without waste, so that the compression performance can be improved.

  According to the invention of claim 5, by providing the shallow groove portion of the seal groove on the outer diameter side of the wrap portion, the outer diameter side of the seal member where the pressure of the compression chamber is low and it is difficult to float the seal member Can be pressed against the end plate.

  According to the invention of claim 6, since the seal groove is formed with the shallow groove portion in the range of almost one turn on the outermost diameter side and the remaining portion is formed as the deep groove portion, the inner diameter of the compression chamber having a high pressure is high. On the side, the seal member can be lifted by the pressure of the compression chamber entering the deep groove and pressed against the other end plate. On the other hand, in the range of almost one turn on the outermost diameter side where the pressure in the compression chamber is low and it is difficult to lift the seal member, the seal member can be protruded from the seal groove by the shallow groove portion and pressed against the other end plate.

  According to the invention of claim 7, the seal member is provided with a plurality of lip portions spaced apart in the length direction of the seal member, and each lip portion is brought into contact with the groove bottom surface and / or side surface of the seal groove. Each lip portion can block the compressed fluid that leaks from the inner diameter side to the outer diameter side through the gap between the seal groove and the seal member, and can increase the compression efficiency.

It is a longitudinal section showing a scroll type air compressor by a 1st embodiment of the present invention. It is a disassembled perspective view which shows the scroll type air compressor of FIG. It is sectional drawing which expanded the lap | wrap part of each scroll from the arrow III-III direction in FIG. It is a disassembled perspective view of the principal part expansion which shows the seal groove and chip | tip seal | sticker of a fixed scroll. It is a principal part expanded sectional view which shows the state which mounted | wore the chip seal in the seal groove of the fixed scroll. It is a bottom view which shows a chip seal by itself from the bottom side. It is sectional drawing which looked at the chip seal from the arrow VII-VII direction in FIG. It is an external appearance perspective view which expands and shows a chip seal from the bottom face alone. It is a front view which shows the fixed scroll by the 2nd Embodiment of this invention. It is sectional drawing which looked at the fixed scroll from the arrow XX direction in FIG. It is sectional drawing which looked at the fixed scroll from the arrow XI-XI direction in FIG. It is a disassembled perspective view of the principal part expansion which shows the seal groove and chip | tip seal | sticker of a fixed scroll by 2nd Embodiment. It is a principal part expanded sectional view which shows the state which mounted | wore the seal groove of the fixed scroll by 2nd Embodiment with the chip seal.

  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 8 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a casing constituting the outer shell of a compressor. The casing 1 is formed in a bottomed cylindrical shape having an opening in one axial direction, and a motor having an output shaft 2A on the other axial side. 2 is attached. The scroll type air compressor is a small compressor mounted as a pneumatic actuator in a vehicle such as an automobile.

  Reference numeral 3 denotes a fixed scroll provided on one side of the casing 1 in the axial direction. The fixed scroll 3 is formed using, for example, a metal material such as aluminum or iron, or an alloy material thereof, and is shown in FIGS. 1 and 2. As described above, the disc-shaped end plate 4, the spiral wrap portion 5 erected on the tooth bottom surface 4 </ b> A of the end plate 4 in the axial direction, and the outer peripheral side of the end plate 4, This is generally constituted by a surrounding cylindrical support 6.

  Here, as shown in FIG. 3, for example, the wrap portion 5 has an end portion on the innermost diameter side as a winding start end and an outermost end portion on the outermost diameter side as an end of winding end. For example, it is wound in a spiral shape of about three and a half turns. The tooth tip surface 5A of the wrap part 5 is axially separated from the tooth bottom surface 9A of the end plate 9 of the orbiting scroll 8 as a counterpart by a certain dimension, and a seal groove 7 described later is provided on the tooth tip surface 5A. It has been.

  7 is a seal groove provided on the tooth tip surface 5 </ b> A of the wrap portion 5, and the seal groove 7 is provided with a chip seal 20 described later. Here, as shown in FIGS. 2 and 3, the seal groove 7 extends over substantially the entire length of the wrap portion 5 and is formed as a spiral concave groove along the wrap portion 5.

  Further, as shown in FIG. 4, the cross-sectional shape (transverse cross section) of the seal groove 7 is formed, for example, in a substantially U shape or a quadrangular shape. The seal groove 7 has a flat groove bottom surface 7A over the entire length, an inner wall surface 7B located on the radially inner side of the groove bottom surface 7A, and an outer wall surface 7C located on the radially outer side of the groove bottom surface 7A. is doing. The seal groove 7 is set to have a dimension H1 in the axial dimension in which the chip seal 20 is mounted, that is, the depth dimension from the tooth tip surface 5A of the wrap portion 5 to the groove bottom surface 7A.

  Reference numeral 8 denotes a turning scroll provided in the casing 1 so as to be capable of turning in opposition to the fixed scroll 3 (see FIG. 1). The orbiting scroll 8 is formed using a metal material such as aluminum or an alloy thereof, for example, in substantially the same manner as the fixed scroll 3.

  The orbiting scroll 8 has a disc-shaped end plate 9 having a tooth bottom surface 9A on the front surface side, and a spiral-shaped end plate erected in the axial direction from the tooth bottom surface 9A of the end plate 9 toward the end plate 4 of the fixed scroll 3. The wrap part 10 and a boss part 11 projecting from the center of the rear surface of the end plate 9 and connected to a drive shaft 13 described later are configured.

  Here, the wrap portion 10 of the orbiting scroll 8 is formed in substantially the same manner as the wrap portion 5 of the fixed scroll 3. That is, as shown in FIG. 3, the wrap portion 10 is wound in a spiral shape of, for example, about three and a half turns from the inner diameter side to the outer diameter side. Further, a seal groove 12 similar to the above-described seal groove 7 is provided on the tooth tip surface side of the wrap portion 10, and a chip seal 25 is attached to the seal groove 12.

  A drive shaft 13 is rotatably provided in the casing 1 via a bearing or the like. As shown in FIG. 1, the drive shaft 13 is attached to the output shaft 2 </ b> A of the motor 2 on the base end side and is driven to rotate by the motor 2. Further, the boss portion 11 of the orbiting scroll 8 is connected to the front end side of the drive shaft 13 via an eccentric bush 14 and an orbiting bearing 15 so as to be orbitable. The eccentric bush 14 connects the boss portion 11 and the drive shaft 13 to each other in a state of being eccentric in the radial direction.

  As a result, when the drive shaft 13 rotates, the orbiting scroll 8 performs an orbiting motion with a constant orbiting radius about the axis. In this case, between the casing 1 and the rear side of the orbiting scroll 8, for example, three anti-rotation mechanisms 16 (only one is shown in FIG. 1) for preventing the orbiting scroll 8 from rotating during the orbiting motion. Is provided.

  The orbiting scroll 8 is disposed so as to overlap with the fixed scroll 3 by, for example, 180 degrees, and a plurality of compression chambers 17 are provided between the wrap portions 5 and 10 from the outer diameter side to the inner diameter side (center). Is defined. During the operation of the compressor, air is sucked into the compression chambers 17 on the outer diameter side from the suction port 18 provided in the fixed scroll 3, and the air is sequentially compressed in each compression chamber 17. The compressed air accommodated in the compression chamber 17 on the side is discharged to the outside from the discharge port 19 provided in the fixed scroll 3.

  Next, the fixed seal 3 side chip seal 20 mounted in the fixed scroll 3 seal groove 7 and the orbiting scroll 8 side chip seal 25 mounted in the orbiting scroll 8 seal groove 12 will be described. Since these chip seals 20 and 25 have different mounting directions, the protruding directions of long seal portions 22 and 27 described later are opposite, and the other portions are formed in substantially the same manner.

  Reference numeral 20 denotes a chip seal as a seal member mounted in the seal groove 7 of the fixed scroll 3. The tip seal 20 for the fixed scroll 3 seals between the wrap portion 5 of the fixed scroll 3 and the end plate 9 of the orbiting scroll 8 serving as a counterpart. Further, the chip seal 20 is formed using a resin material having excellent heat resistance, wear resistance, and slidability, for example, a resin composite material including polytetrafluoroethylene (PTFE). Further, the tip seal 20 extends in a spiral shape along the length direction of the seal groove 7 as shown in FIGS. The chip seal 20 is roughly constituted by a short seal portion 21 on the inner diameter side and a long seal portion 22 on the outer diameter side, which will be described later.

  Reference numeral 21 denotes a short seal portion that forms the inner diameter side of the chip seal 20. As shown in FIGS. 4 and 5, the short seal portion 21 has a substantially square cross-sectional shape, a bottom surface 21A facing the groove bottom surface 7A of the seal groove 7, and a seal groove facing the bottom surface 21A. 7, a seal surface 21 </ b> B disposed on the opening side, an inner peripheral surface 21 </ b> C facing the inner wall surface 7 </ b> B of the seal groove 7, and an outer peripheral surface 21 </ b> D facing the outer wall surface 7 </ b> C of the seal groove 7. Further, the short seal portion 21 is attached to the seal groove 7 from the bottom surface 21 </ b> A, and the seal surface 21 </ b> B comes into contact with the end plate 9 of the orbiting scroll 8 by being lifted by air pressure.

  Further, the short seal portion 21 is formed in the remaining range excluding one turn on the outermost diameter side, which becomes the long seal portion 22 described later, out of the total length of the spiral tip seal 20. Specifically, the short seal portion 21 is formed in a range from the inner diameter end portion 21E on the center side to a step portion 22E of the long seal portion 22 described later, and the range of the short seal portion 21 is 3 of the tip seal 20. Of the number of turns of the winding half, it is approximately two and a half turns on the inner diameter side.

  Here, the short seal portion 21 forms a part on the inner diameter side of the chip seal 20. Unlike the outermost diameter side, the short seal portion 21 has a large differential pressure between the seal surface 21B and the bottom surface 21A. Yes. Therefore, the short seal portion 21 can surely float by the differential pressure of the compressed air, and the seal surface 21B can be pressed against the tooth bottom surface 9A of the end plate 9 of the orbiting scroll 8 as the counterpart.

  Reference numeral 22 denotes a long seal portion that forms the outer diameter side of the tip seal 20. The long seal portion 22 is formed integrally with the short seal portion 21. Further, the long seal portion 22 has a rectangular cross-sectional shape substantially similar to the short seal portion 21, and includes a bottom surface 22 </ b> A that faces the groove bottom surface 7 </ b> A of the seal groove 7, and a seal surface 21 </ b> B of the short seal portion 21. The inner peripheral surface 22C facing the inner wall surface 7B of the seal groove 7 and the outer peripheral surface 22D facing the outer wall surface 7C of the seal groove 7 are provided. Further, the bottom surface 22A of the long seal portion 22 has a step portion 22E at the boundary with the bottom surface 21A of the short seal portion 21. By this step portion 22E, the long seal portion 22 is more than the short seal portion 21. Is also formed so as to be long in the axial direction.

  Accordingly, the configuration of the long seal portion 22 will be described in detail. As shown in FIG. 6, the long seal portion 22 is formed in a range of approximately 2π (360 degrees) from the step portion 22E to the outer diameter end portion 22F. This range is approximately one turn on the outermost diameter side of the three and a half turns of the chip seal 20. Further, as shown in FIG. 4, the long seal portion 22 protrudes from the bottom surface 21A of the short seal portion 21 in the axial direction by a dimension G1. Due to this protruding dimension G1, the height dimension (dimension from the bottom surface 21A to the seal surface 22B) H2 of the long seal portion 22 is larger than the depth dimension H1 of the seal groove 7 (H2> H1).

  Here, of the compression chamber 17 located on the outer diameter side, for example, the compression chamber 17 defined by using the outermost diameter side of one turn (one round) of the three and a half chip seals 20, the differential pressure is It is small and the outer diameter side part of the chip seal 20 cannot be levitated. However, the range of almost one turn on the outermost diameter side of the tip seal 20 can be protruded from the seal groove 7 as the long seal portion 22, so that even when the pressure in the compression chamber 17 on the outer diameter side is low, the length is long. The seal surface 22 </ b> B of the small seal portion 22 can be pressed against the tooth bottom surface 9 </ b> A of the end plate 9 of the orbiting scroll 8.

  Reference numeral 23 denotes a plurality of bottom surface lip portions formed on the bottom surface 21 </ b> A of the short seal portion 21 and the bottom surface 22 </ b> A of the long seal portion 22 constituting the chip seal 20. As shown in FIG. 5, these bottom lip portions 23 are formed as thin lip portions by, for example, cutting the bottom surfaces 21A and 22A of the seal portions 21 and 22 diagonally, and the length of the tip seal 20 is increased. It arrange | positions at intervals in a direction (spiral direction).

  The tip end side of the bottom lip portion 23 expands toward the inner diameter side in the spiral direction of the tip seal 20, and the free end side protruding obliquely elastically contacts the groove bottom surface 7 </ b> A of the seal groove 7. As a result, each bottom lip portion 23 causes the gap between the bottom surfaces 21A and 22A of the seal portions 21 and 22 and the groove bottom surface 7A of the seal groove 7 in the length direction of the chip seal 20 when the compression operation is performed. For this reason, the compressed air is prevented from leaking from the inner diameter side to the outer diameter side of the seal groove 7 through a plurality of locations.

  Reference numeral 24 denotes a plurality of inner lip portions formed on the inner peripheral surface 21C of the short seal portion 21 and the inner peripheral surface 22C of the long seal portion 22 at intervals in the spiral direction. The front end side of each inner lip portion 24 expands toward the inner diameter side of the chip seal 20 and elastically contacts the inner wall surface 7B of the seal groove 7.

  The inner lip portions 24 block the gaps between the inner peripheral surfaces 21C and 22C of the seal portions 21 and 22 and the inner wall surface 7B of the seal groove 7 at a plurality of locations with respect to the length direction of the chip seal 20. In addition, the compressed air is prevented from leaking from the inner diameter side to the outer diameter side of the seal groove 7 through these spaces.

  On the other hand, 25 is a chip seal mounted in the seal groove 12 of the orbiting scroll 8 (see FIG. 2). The tip seal 25 on the side of the orbiting scroll 8 has a spiral shape of approximately three and a half turns, similar to the tip seal 20 on the fixed scroll 3 side described above. Further, in the tip seal 25, two and a half turns on the inner diameter side are short seal portions 26, and one turn on the outermost diameter side is a long seal portion 27 within a range of about 2π. Further, the chip seal 25 is provided with a plurality of bottom lip portions and inner lip portions (none of which are shown). However, since the tip seal 25 on the orbiting scroll 8 side has a different mounting direction from the tip seal 20 on the fixed scroll 3 side, the protruding direction of the long seal portion 27 is opposite to the protruding direction of the long seal portion 22 described above. This is different from the tip seal 20.

  The scroll type 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 13 is rotationally driven by the motor 2, the rotation of the drive shaft 13 is transmitted to the orbiting scroll 8 through the eccentric bush 14, the orbiting bearing 15, and the like. Thereby, the orbiting scroll 8 performs the orbiting motion around the drive shaft 13 in a state where the rotation is restricted by the rotation preventing mechanism 16.

  At this time, the compression chamber 17 defined between the wrap portion 5 of the fixed scroll 3 and the wrap portion 10 of the orbiting scroll 8 is continuously reduced from the outer diameter side toward the inner diameter side. Thus, the compressor sequentially compresses the outside air sucked from the suction port 18 in each compression chamber 17 and discharges the compressed air from the discharge port 19 toward an external tank (not shown) or the like.

  Further, during the compression operation, compressed air flows from the compression chambers 17 into the gaps between the seal grooves 7 and 12 and the tip seals 20 and 25, and the tip seals 20 and 25 are lifted to counteract the end plates 9 and 4 of the other party. Press on. At this time, the range of one turn on the outermost diameter side of each of the tip seals 20 and 25 that cannot sufficiently float due to a small differential pressure in the compression chamber 17 is formed on the end plates 9 and 4 by the long seal portions 22 and 27. Can be pressed. Thereby, the sealing performance of each compression chamber 17 can be improved while suppressing the frictional resistance between each chip seal 20, 25 and the end plate 9, 4, and the air corresponding to the volume of the compression chamber 17 can be compressed without waste. Can do.

  Further, during the compression operation, compressed air flows into the gaps between the seal grooves 7 and 12 and the tip seals 20 and 25, and tries to leak from the inner diameter side to the outer diameter side through the gaps. However, since the tip seals 20 and 25 are provided with the lip portions 23 and 24, the lip portions 23 and 24 can block the compressed air from leaking out.

  As described above, according to the first embodiment, the tip seal 20 is protruded so as to be long in the axial direction on the outermost diameter side of the seal groove 7 facing the groove bottom surface 7A. The long seal portion 22 is provided, and the chip seal 25 is similarly provided with a long seal portion 27, and the long seal portions 22, 27 allow one turn on the outer diameter side of the chip seals 20, 25 to be sealed groove 7. , 12 projecting from the head.

  Accordingly, each long seal portion 22, 27 has a small differential pressure in the compression chamber 17, and it is difficult to press the tip seals 20, 25 on the end plates 9, 4. It can be pressed and the sealing performance of this part can be forcibly enhanced.

  As a result, only the portion where the sealing performance of the tip seals 20 and 25 is lowered can be pressed against the other end plate 9 and 4, so that the frictional resistance between the tip seals 20 and 25 and the end plate 9 and 4 is kept small. In addition, sufficient sealing performance can be obtained. Thereby, the pressing force of the chip seals 20 and 25 against the opposite end plates 9 and 4 can be made appropriate over the entire length, and the frictional resistance can be minimized to reduce the mechanical loss.

  Further, by improving the sealing performance of the compression chamber 17 on the outer diameter side, the air corresponding to the volume of the compression chamber 17 can be compressed without waste, so that the compression performance of the scroll type air compressor can be enhanced.

  The tip seals 20 and 25 are formed with long seal portions 22 and 27 in the range of approximately one turn (approximately 2π) on the outermost diameter side, and the short seal portions 21 and 26 in the remaining two and a half ranges. Therefore, on the inner diameter side where the differential pressure in the compression chamber 17 is large, the short seal portions 21 and 26 are levitated by the pressure of the compression chamber 17 entering the seal grooves 7 and 12, and the opposite end plates 9 and 4 are opposed to each other. Can be pressed against. On the other hand, in the range of almost one turn on the outermost diameter side where the differential pressure in the compression chamber 17 is small and it is difficult to float the chip seals 20 and 25, the long seal portions 22 and 27 protruding from the seal grooves 7 and 12 Can be pressed against the end plates 9 and 4.

  Furthermore, since the sealing performance of the compression chamber 17 can be improved with a simple configuration in which the tip seals 20 and 25 are simply formed by the short seal portions 21 and 26 and the long seal portions 22 and 27, the orbiting scroll 8 It is not necessary to provide a complicated mechanism such as a back pressure chamber that presses against the fixed scroll 3 side, and the configuration can be simplified.

  Further, since the long seal portions 22 and 27 are also provided with the bottom lip portion 23, the bottom lip portion 23 can block the compressed air from leaking even when it is worn beyond the protruding dimension G1. it can.

  Next, FIGS. 9 to 13 show a second embodiment of the present invention. A feature of the second embodiment is that the seal groove provided in the wrap portion of the scroll is provided with a shallow groove portion with a part of the surface facing the bottom surface of the seal member being short in the axial direction, The configuration is such that the shallow groove protrudes from the seal groove at the time of mounting. 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.

  9 to 11, reference numeral 31 denotes a fixed scroll according to the second embodiment. This fixed scroll 31 is substantially the same as the fixed scroll 3 according to the first embodiment described above, and a spiral plate 32 and a spiral shape standing on the tooth bottom surface 32A of the mirror plate 32 in the axial direction. The wrap portion 33 and a cylindrical support portion 34 that is provided on the outer peripheral side of the end plate 32 and surrounds the wrap portion 33, and a seal groove 35 described later is formed on the tooth tip surface 33 A of the wrap portion 33. Is provided with an opening.

  However, the fixed scroll 31 according to the second embodiment is different from the fixed scroll 3 according to the first embodiment in that the seal groove 35 includes a deep groove portion 36 and a shallow groove portion 37 which will be described later. Yes.

  Reference numeral 35 denotes a spiral seal groove provided to open on the tooth tip surface 33A of the wrap portion 33. The seal groove 35 is roughly constituted by a deep groove portion 36 on the inner diameter side and a shallow groove portion 37 on the outer diameter side in order to project a later-described chip seal 38 disposed on the outer diameter side.

  Reference numeral 36 denotes a deep groove portion that forms the inner diameter side of the seal groove 35. As shown in FIG. 12, the deep groove portion 36 is formed as a groove having, for example, a substantially U-shaped or quadrangular cross section by a groove bottom surface 36A, an inner wall surface 36B, and an outer wall surface 36C. Further, the deep groove portion 36 is formed in the remaining range of the entire length of the spiral seal groove 35 except for one turn on the outermost diameter side that becomes a shallow groove portion 37 described later. Specifically, the deep groove portion 36 is provided in a range from the inner diameter end portion 36D on the center side to a step portion 37D of the shallow groove portion 37 described later. The range of the deep groove portion 36 is the number of turns of the three and half turns of the seal groove 35. The inner diameter side is approximately two and a half turns.

  Reference numeral 37 denotes a shallow groove portion that forms the outer diameter side of the seal groove 35. The shallow groove portion 37 forms a seal groove 35 together with the deep groove portion 36. In addition, the shallow groove portion 37 is formed as a groove having a substantially U-shaped or quadrangular cross section by a groove bottom surface 37A, an inner wall surface 37B, and an outer wall surface 37C in substantially the same manner as the deep groove portion 36. Further, the groove bottom surface 37A of the shallow groove portion 37 has a step portion 37D at the boundary with the groove bottom surface 36A of the deep groove portion 36, and the shallow groove portion 37 is formed in a short dimension in the axial direction by the step portion 37D. .

  Therefore, the configuration of the shallow groove portion 37 will be described in detail. The shallow groove portion 37 is provided in a range of approximately 2π (360 degrees) from the step portion 37D to the outer diameter end portion 37E. Of the number of turns of the winding half, it is almost one turn on the outermost diameter side. Further, as shown in FIG. 12, the shallow groove portion 37 protrudes from the groove bottom surface 36A of the deep groove portion 36 in the axial direction by a dimension G2. Due to this protruding dimension G2, the depth dimension (dimension from the tooth tip surface 33A of the lap portion 33A to the groove bottom surface 37A) H3 of the shallow groove portion 37 is smaller than the height dimension H4 of the chip seal 38 described later. (H3 <H4).

  As a result, the shallow groove portion 37 can project the range of almost one turn on the outermost diameter side of the tip seal 38 from the seal groove 35, so that the seal surface 38 </ b> B of the tip seal 38 is made to extend from the end plate 9 of the revolving scroll 8. It can be pressed against the root surface 9A.

  Reference numeral 38 denotes a chip seal according to the second embodiment as a seal member mounted in the seal groove 35. The tip seal 38 is formed in a square shape by a bottom surface 38A, a seal surface 38B, an inner peripheral surface 38C, and an outer peripheral surface 38D, and the height dimension from the bottom surface 38A to the seal surface 38B is set to a uniform dimension H4 over the entire length. Has been. The chip seal 38 is provided with a bottom lip 39 and an inner lip 40.

  In the second embodiment, only the configuration in which the tip seal 38 is attached to the seal groove 35 provided in the lap portion 33 of the fixed scroll 31 has been described. However, the seal groove having the same function also on the orbiting scroll side. And a tip seal. However, in this embodiment, illustration and description are omitted.

  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 seal groove 35 has a depth dimension H3 in the axial direction by shortening the outermost diameter side of the tip seal 38 facing the bottom surface 38A in the axial direction. A small shallow groove portion 37 is provided. Thereby, when the tip seal 38 is mounted in the seal groove 35, the tip seal 38 can be protruded from the seal groove 35 by the shallow groove portion 37.

  Therefore, the shallow groove portion 37 of the seal groove 35 can press one turn on the outermost diameter side of the tip seal 38 against the end plate 9 regardless of the pressure difference of the compression chamber 17. As a result, a sufficient sealing performance by the tip seal 38 can be obtained while keeping the frictional resistance between the tip seal 38 and the end plate 9 small.

  In the first embodiment, the case where the step 22E is provided between the short seal portion 21 and the long seal portion 22 has been described as an example. However, the present invention is not limited to this. For example, the short seal portion 21 and the long seal portion 22 may be smoothly connected using an inclined surface or a curved surface. This concept can be applied to the second embodiment as well.

  Moreover, in 1st Embodiment, the case where it was set as the structure which uses the 1st volume of the outermost diameter side of the chip seals 20 and 25 as the long-sized seal parts 22 and 27 was illustrated. However, the present invention is not limited to this. For example, when it is desired to keep the sliding resistance small, the tip seals 20 and 25 may be in a range smaller than one volume. One or more rolls may be provided. These configurations can be similarly applied to the second embodiment.

  On the other hand, in the first embodiment, the chip seal 20 is provided with the bottom lip 23 and the inner lip 24, and the chip seal 25 is similarly provided with the bottom lip and the inner lip. Explained. However, the present invention is not limited to this, and only one of the bottom lip portion and the inner lip portion may be provided on the chip seal, or the lip portion may be eliminated. These configurations can be similarly applied to the second embodiment.

  Further, in each of the embodiments, the scroll type air compressor is described as an example of the scroll type fluid machine. However, the present invention is not limited to this and can be widely applied to, for example, a vacuum pump, a refrigerant compressor, and the like. is there.

3,31 Fixed scroll 4,9,32 End plate 4A, 9A, 32A Tooth base 5,10,33 Lapping part 5A, 33A Tooth tip surface 7,12,35 Seal groove 7A, 36A, 37A Groove bottom 7B, 36B, 37B Inner wall surface 7C, 36C, 37C Outer wall surface 8 Orbiting scroll 17 Compression chamber 20, 25, 38 Tip seal (seal member)
21, 26 Short seal portion 21A, 22A, 38A Bottom surface 21B, 22B, 38B Seal surface 21C, 22C, 38C Inner peripheral surface 21D, 22D, 38D Outer peripheral surface 22, 27 Long seal portion 22E, 37D Step portion 23, 39 Bottom lip part 24, 40 Inner lip part 36 Deep groove part 37 Shallow groove part H1 Depth dimension of seal groove G1 Step dimension between short seal part and long seal part H2 Height dimension of long seal part of chip seal H3 seal Depth dimension of shallow groove part of groove G2 Step dimension between deep groove part and shallow groove part H4 Height dimension of chip seal

To solve the problems described above described, features of the configuration in which the invention of claim 1 is employed, the seal groove is shallow groove as part-length of the part of the surface facing the bottom surface of the seal member in the axial direction the provided, said sealing member is projected from the seal groove by the shallow groove portion at the time of mounting, the seal member is spaced apart in the longitudinal direction of the seal member, contacts the groove bottom surface of the seal groove in that a structure in which Ru is provided a plurality of lip portions.

The invention of claim 2 is that the shallow groove portion of the seal groove is provided on the outer diameter side of the wrap portion.

According to a third aspect of the present invention, the seal groove is formed by forming a shallow groove portion in the range of approximately one turn on the outermost diameter side and forming the remaining portion as a deep groove portion.

A fourth aspect of the present invention, the sealing member is spaced apart in the longitudinal direction of the sealing member, in that a configuration in which a plurality of lip portion contacting the side surface of the seal groove.

According to the invention of claim 1 , the seal groove is provided with a shallow groove portion with a part of the surface facing the bottom surface of the seal member being short in the axial direction, and the seal member protrudes from the seal groove by the shallow groove portion when mounted. It is configured to do. Therefore, by making the portion of the total length of the seal groove where the sealing performance of the seal member is reduced to be a shallow groove portion, the shallow groove portion allows the seal member to protrude from the seal groove and be pressed against the opposite end plate.

As a result, the shallow groove portion can press only the portion where the sealing performance of the sealing member is lowered against the other end plate, so that the frictional resistance between the seal member and the end plate can be kept small and sufficient. Sealability can be obtained. Thereby, the pressing force of the seal member against the other end plate can be made appropriate over the entire length, and the frictional resistance can be reduced to reduce the mechanical loss. Further, by improving the sealing performance of the compression chamber, the fluid corresponding to the volume of the compression chamber can be compressed without waste, so that the compression performance can be improved.
In addition, since the seal member is provided with a plurality of lip portions spaced apart in the length direction of the seal member, each lip portion comes into contact with the groove bottom surface of the seal groove, so that each lip portion has a seal groove and a seal. The compressed fluid that is about to leak from the inner diameter side to the outer diameter side through the gap with the member can be shut off, and the compression efficiency can be increased.

According to the invention of claim 2 , by providing the shallow groove portion of the seal groove on the outer diameter side of the lap portion, the outer diameter side of the seal member where the pressure of the compression chamber is low and it is difficult to float the seal member Can be pressed against the end plate.

According to the invention of claim 3 , since the seal groove is formed with a shallow groove portion in the range of almost one turn on the outermost diameter side and the remaining portion is formed as a deep groove portion, the inner diameter of the compression chamber with a high pressure is high. On the side, the seal member can be lifted by the pressure of the compression chamber entering the deep groove and pressed against the other end plate. On the other hand, in the range of almost one turn on the outermost diameter side where the pressure in the compression chamber is low and it is difficult to lift the seal member, the seal member can be protruded from the seal groove by the shallow groove portion and pressed against the other end plate.

According to the invention of claim 4, the seal member, spaced in the longitudinal direction of the seal member provided with a plurality of lip portions treasure, by respective lip portion contacts the side surface of the seal groove, the lip The portion can block the compressed fluid that tries to leak from the inner diameter side to the outer diameter side through the gap between the seal groove and the seal member, and can increase the compression efficiency.

The present invention is an invention belonging to a group of inventions including a plurality of inventions described below. Hereinafter, the first and second embodiments will be described as embodiments of the invention group. The second embodiment corresponds to the invention described in the claims of the present applicant.
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.

Claims (7)

One scroll in which a wrap portion wound in a spiral shape from the inner diameter side to the outer diameter side of the end plate is erected in the axial direction;
The other scroll, which is provided facing the one scroll and has a spiral wrap portion standing on the end plate in the axial direction overlapping the lap portion of the one scroll on the end plate;
A spiral seal groove provided on the tooth tip surface of at least one of the scroll wrap portions;
In a scroll type fluid machine comprising a seal member mounted in the seal groove and in sliding contact with the other end plate,
The seal member is provided with a long seal portion in which a part of a surface facing the groove bottom surface of the seal groove is protruded to be long in the axial direction,
The scroll fluid machine according to claim 1, wherein the seal member is configured to protrude from the seal groove by the long seal portion when mounted.   The scroll fluid machine according to claim 1, wherein the long seal portion of the seal member is provided on the outer diameter side of the wrap portion.   2. The scroll fluid machine according to claim 1, wherein the seal member is formed by forming the long seal portion in a range of approximately one turn on the outermost diameter side and forming the remaining portion as a short seal portion. One scroll in which a wrap portion wound in a spiral shape from the inner diameter side to the outer diameter side of the end plate is erected in the axial direction;
The other scroll provided opposite to the one scroll and having a spiral wrap portion standing in the axial direction on the end plate and overlapping the wrap portion of the one scroll;
A spiral seal groove provided on the tooth tip surface of at least one of the scroll wrap portions;
In a scroll type fluid machine comprising a seal member mounted in the seal groove and in sliding contact with the other end plate,
In the seal groove, a shallow groove portion is provided with a part of the surface facing the bottom surface of the seal member being short in the axial direction,
The scroll fluid machine according to claim 1, wherein the seal member is configured to protrude from the seal groove by the shallow groove portion when mounted.   The scroll fluid machine according to claim 4, wherein the shallow groove portion of the seal groove is provided on the outer diameter side of the wrap portion.   5. The scroll fluid machine according to claim 4, wherein the seal groove is formed by forming a shallow groove portion in a range of approximately one turn on the outermost diameter side and forming a remaining portion as a deep groove portion.   The first, second, third, and third sealing members are provided with a plurality of lip portions that are formed apart from each other in the length direction of the sealing member and that contact the bottom surface and / or the side surface of the sealing groove. The scroll fluid machine according to 4, 5 or 6.

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