JP5525863B2 - Scroll type fluid machine - Google Patents

Description

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

  The scroll type fluid machine disclosed in Patent Document 1 is a seal member in which a lip portion is formed by inserting a linear cut in order to prevent leakage through a groove formed in a tooth tip of a lap portion with a bottom surface of the seal member. It has. Further, the seal member of the scroll type fluid machine disclosed in Patent Document 1 is such that the seal main body portion to be mounted in the groove is formed of a soft elastic material, and the slidable contact surface side portion of the seal member that is in sliding contact with the other tooth bottom surface. Is formed as a hard layer having a higher hardness than the elastic material.

  Moreover, the scroll type fluid machine of patent document 2 uses the thing in which the alumite was formed in the sliding surface of a scroll wrap, and the tip seal uses the thing of the single layer containing diatomaceous earth.

JP-A-9-32756 JP 2004-277610 A

  The hard layer of the chip seal of the scroll type fluid machine of Patent Document 1 uses a softer material than alumite. Therefore, much time is required to smooth the anodized surface, and the wear amount of the tip seal is increased, and the life of the scroll fluid machine cannot be extended.

  Further, the tip seal of the scroll type fluid machine of Patent Document 2 contains diatomaceous earth having a hardness higher than that of anodized, thereby increasing the wear rate of the anodized layer. Furthermore, since the tip seal is a single layer, the alumite layer continues to wear even after the alumite layer is smooth, and it is difficult to extend the life of the scroll fluid machine.

  From the above, in order to extend the life of the scroll type fluid machine, it is essential to reduce the wear of both the tip seal and the anodized layer. It was difficult to realize the reduction. Therefore, in either case of Patent Documents 1 and 2, it is necessary to form at least one of the tip seal or the alumite layer in order to extend the life of the scroll fluid machine, resulting in an increase in cost.

  Accordingly, an object of the present invention is to provide a scroll type fluid machine that can achieve a long life without causing an increase in cost by bringing a filler layer of a chip seal containing a filler into sliding contact at an initial stage of operation. And

In order to solve the above-described problems, the present invention provides a fixed scroll in which a spiral wrap portion is provided on the bottom surface of the end plate, and a wrap of the fixed scroll provided on the bottom surface of the end plate. A rotating scroll provided with a spiral wrap portion so as to form a plurality of compression chambers with the portion, and at least one of the wrap portions of the orbiting scroll and the fixed scroll, In a scroll type fluid machine in which a concave groove extending along the tooth tip of the wrap portion is formed, and a seal member slidingly contacting the bottom surface of the other scroll is mounted in the concave groove, the seal member is in sliding contact. the bottom land of the mating scroll, surface treatment to increase the corrosion resistance made, the seal member includes a soft layer is softer layer than the bottom land of the other party, the teeth A layer containing a sliding surface portion of the surface in sliding contact said seal member, wherein the blended root surface more hard fillers having hardness, the filler layer is a layer having a hardness equal to or larger than the bottom land It was formed by these.

  It is possible to provide a scroll type fluid machine capable of realizing a long life without incurring an increase in cost.

It is a longitudinal cross-sectional view of the principal part which expands and shows the sealing member etc. of the scroll type air compressor by Example 1 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 2 of this invention. It is a longitudinal section showing a scroll type air compressor. It is an expanded sectional view of the arrow IV-IV direction in FIG. It is an expanded sectional view of the arrow VV direction in FIG. It is a fragmentary perspective view which shows a chip seal. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 3 of this invention. It is a principal part longitudinal cross-sectional view similar to FIG. 1 which shows Example 4 of this invention. It is the graph which compared and showed the amount of wear of the ship seal in Example 1 of this invention, and a prior art, and the other party surface.

  Hereinafter, the case where the scroll type fluid machine according to the first embodiment of the present invention is used as an air compressor based on FIGS. 1 to 6 will be described as an example.

  Here, FIG. 3 shows a longitudinal sectional view of the scroll type air compressor in the first embodiment of the present invention. In the figure, reference numeral 1 denotes a fixed scroll that constitutes a part of a casing of a scroll type air compressor, and the fixed scroll 1 covers the open end side of a casing body (not shown) that is generally formed in a covered cylinder. As shown in the figure, it is fixed to the opening end side. The fixed scroll 1 is made of, for example, an aluminum alloy or the like, and has a disc-shaped end plate 2 disposed so that the center thereof coincides with an axis O1-O1 of a drive shaft 17 to be described later. The spiral wrap portion 3 erected on the tooth bottom surface 2 </ b> A, and a support portion 4 that is positioned on the outer peripheral side of the end plate 2 and is formed in a cylindrical shape so as to surround the wrap portion 3. .

  Further, as shown in FIG. 4, the wrap portion 3 of the fixed scroll 1 is formed in a spiral shape of, for example, about three and a half turns, with the inner peripheral side being the winding start end and the outer peripheral side (not shown) being the winding end end. ing. The tooth tip 3A of the wrap portion 3 is separated from the tooth bottom surface 10A of the orbiting scroll 9 described later with a minute clearance C as shown in FIG.

  5 shows a concave groove formed on the tooth tip 3A side of the wrap portion 3, and the concave groove has a U-shaped cross section at the middle portion in the width direction on the tooth tip 3A side of the wrap portion 3 as shown in FIG. The bottom surface 5A of the concave groove 5 and the left and right side surfaces 5B and 5C extend from the winding start end to the winding end end along the spiral shape of the wrap portion 3. A chip seal 6 to be described later is mounted in the concave groove 5 so as to seal between the tooth bottom surface 10A of the orbiting scroll 9 as a counterpart.

  6 shows a chip seal as a seal member mounted in the concave groove 5 of the lap portion 3, and the chip seal 6 is formed as a long chip seal having a square cross section made of, for example, an elastic resin material, The groove 5 extends in a spiral shape along the length direction of the groove 5.

  Here, as shown in FIG. 5, the tip seal 6 is slidably contacted with the lower side surface 6A as a pressure receiving surface that contacts the bottom surface 5A of the concave groove 5, and with the lower side surface 6A in the vertical direction and in contact with the other tooth bottom surface 10A. The upper side surface 6B is composed of an inner side surface 6C and an outer side surface 6D positioned on the inner side and the outer side in the radial direction of the spiral tip seal 6. The lower side surface 6A and the inner side surface 6C have lower lip portions 7 described later. The inner lip portions 8 are integrally formed. The chip seal 6 has inner and outer surfaces 6C and 6D inserted into the groove 5 with a slight gap so that the lower surface 6A abuts the bottom surface 5A of the groove 5, and from the bottom surface 5A of the groove 5 It is possible to float toward the tooth bottom surface 10A of the orbiting scroll 9 as the opponent.

  7, 7,... Indicate lower lip portions as bottom lip portions formed at predetermined intervals in the length direction on the lower surface 6A of the chip seal 6, and the lower lip portions 7 are as shown in FIG. In addition, the tip seal 6 is integrally formed by cutting obliquely into the lower side surface 6A of the chip seal 6 at a predetermined interval, and the tip end side thereof becomes a free end and expands from the lower side surface 6A.

  8, 8,... Indicate inner lip portions as side lip portions of the tip seal 6. Each inner lip portion 8 is formed in substantially the same manner as the lower lip portion 7, and is formed on the inner side surface 6C of the tip seal 6. It is integrally formed by cutting diagonally at intervals, and the tip end side thereof is a free end and is expanded from the inner side surface 6C.

  Reference numeral 9 denotes a orbiting scroll provided in the casing body so as to be capable of turning in opposition to the fixed scroll 1, and the orbiting scroll 9 is formed of, for example, an aluminum alloy or the like, and has a disk-like surface with a tooth bottom surface 10A. The formed end plate 10, the wrap portion 11 that is erected from the tooth bottom surface 10 </ b> A of the end plate 10 toward the end plate 2 of the fixed scroll 1, and is formed in a spiral shape like the wrap portion 3 of the fixed scroll 1, and the end plate 10 and a boss portion 12 provided in the center of the back surface, and the boss portion 12 is rotatably attached to a crank 17A of a drive shaft 17 described later.

  Here, as shown in FIG. 4, the wrap portion 11 of the orbiting scroll 9 is formed in a spiral shape of, for example, about three and a half turns like the wrap portion 3 of the fixed scroll 1, and the tooth tip 11A side has a bottom surface. A concave groove 13 having a U-shaped cross section is formed from 13A and the left and right side surfaces 13B and 13C.

  Reference numeral 14 denotes another tip seal as a sealing member formed in the same manner as the tip seal 6 on the fixed scroll 1 side. The tip seal 14 is mounted in the concave groove 13 and is in contact with the bottom surface 13A of the lower side surface 14A. And an upper side surface 14B that is in sliding contact with the other tooth bottom surface 2A, an inner side surface 14C, and an outer side surface 14D. Similarly to the tip seal 6, a lower lip portion 15 and an inner lip portion 16 are integrally formed on the lower side surface 14A and the inner side surface 14C of the tip seal 14, respectively.

  In this embodiment, the recessed grooves 5 and 13 and the tip seals 6 and 14 are provided on both the fixed scroll 1 and the orbiting scroll 9, but may be provided only on either one.

  Reference numeral 17 denotes a drive shaft that is rotatably provided on the casing body. The drive shaft 17 is a crank 17A having a distal end extending into the casing body. The crank 17A has an axis O2-O2 that is an axis O1-O1 of the drive shaft 17. Is eccentric by a predetermined dimension δ. The boss 12 of the orbiting scroll 9 is turnably attached to the crank 17A of the drive shaft 17 via an orbiting bearing 18, and the orbiting scroll 9 is provided with an anti-rotation mechanism (not shown) or the like. A swivel motion is given.

  Here, the lap portion 11 of the orbiting scroll 9 is disposed so as to be overlapped with the lap portion 3 of the fixed scroll 1 while being shifted by a predetermined angle in the circumferential direction, and as shown in FIG. A plurality of compression chambers R, R,... Having a crescent shape are defined. When the orbiting scroll 9 is orbited with respect to the fixed scroll 1, the volume of each compression chamber R is continuously reduced, and the air sucked from the suction port 19 described later is sequentially compressed. .

Reference numerals 19 and 20 denote suction ports and discharge ports formed in the fixed scroll 1. The suction port 19 is formed on the outer peripheral side of the end plate 2 so as to communicate with the outermost peripheral compression chamber R. The discharge port 20 The end plate 2 is drilled in the center of the end plate 2 so as to communicate with the innermost circumferential compression chamber R.
The scroll type air compressor according to the prior art has the above-described configuration, and the operation thereof will be described next.

  First, when the drive shaft 17 is rotationally driven from the outside of the casing by a drive source (not shown) such as a motor, this rotation is transmitted from the crank 17A of the drive shaft 17 to the orbiting scroll 9 via the orbiting bearing 18, The orbiting scroll 9 performs an orbiting motion with an orbiting radius of dimension δ around the axis O1-O1 of the drive shaft 17.

  And each compression chamber R defined between each lap | wrap parts 3 and 11 by this turning motion shrink | contracts continuously toward the center, compressing the air suck | inhaled from the suction port 19 sequentially, this compressed air Is discharged from the discharge port 20 toward an external air tank (not shown) or the like. Here, when the compression operation is started, a part of the compressed air enters the concave groove 5 (13) of the lap portion 3 (11) from the compression chamber R on the high pressure side in the direction of arrow A shown in FIG. The tip seal 6 (14) is lifted from the concave groove 5 (13) by receiving the pressure of the compressed air at the lower side surface 6A (14A) serving as a pressure receiving surface, and teeth of the facing end plate 10 (2) are opposed to each other. It is pressed toward the bottom surface 10A (2A). As a result, the tip seal 6 (14) has its upper side surface 6B (14B) slidably in contact with the other tooth bottom surface 10A (2A) and hermetically seals each compression chamber R defined between the wrap portions 3 and 11. .

  Also, each lower lip 7 (15) has a groove 5 in the direction indicated by the arrow B in FIG. 4 from the inner compression chamber R toward the outer compression chamber R of each compression chamber R. (13) Due to the compressed air that has entered the inside, the tip side of each lower lip 7 (15) is pressed against the bottom surface 5A (13A) of the groove 5 (13), and the groove 5 (13) The space between the bottom surface 5A (13A) and the tip seal 6 (14) is hermetically sealed.

  Further, each inner lip portion 8 (16) also has the tip side of each inner lip portion 8 (16) of one of the concave grooves 5 (13) due to the compressed air that has entered the concave groove 5 (13). The side surface 5B (13B) of the concave groove 5 (13) is pressed against the side surface 5B (13B) and the tip seal 6 (14) in an airtight manner, and the tip seal 6 (14) The outer side surface 6D (14D) is pressed against the other side surface 5C (13C), and the space between the two is hermetically sealed.

  By the way, in the scroll type air compressor described above, when the orbiting scroll 9 is swung with respect to the fixed scroll 1, each compression chamber R becomes a high temperature state, and in particular, compression on the inner peripheral side (discharge port 20 side). Since the chamber R becomes high temperature and pressure, a thin film of aluminum oxide having a depth of, for example, about 60 μm is formed on the surfaces of the tooth bottom surfaces 2A and 10A on the fixed scroll 1 and the orbiting scroll 9 that define the compression chamber R. (So-called anodizing treatment) enhances the corrosion resistance.

  In addition, the anodizing treatment enhances the corrosion resistance and at the same time increases the surface hardness, thereby improving the wear resistance and making it difficult to be damaged. The wear resistance is particularly important, and it is a technique that is particularly effective for a sliding portion of an aluminum material that is oil-free (no oil is supplied to the compression chamber).

  In the case where the post-processing such as polishing is not performed, the anodizing treatment has an appropriate film thickness of about 10 to 30 μm in terms of processing time and processing current value (power consumption), and Vickers hardness is Hv 200 to 450. The degree is suitable. The surface roughness of the anodized film produced under these conditions is generally Rmax = 5 to 30 μm.

  In general, it is known that when anodizing is performed, the surface is rough and hard by several times compared to the original aluminum material, and the surface such as the tooth bottom surface 10A (2A) is an anode. When roughened or hardened by the oxidation treatment, the tip seal 6 (14) of the fixed scroll 1 (the turning scroll 9) in sliding contact with the tooth bottom surface 10A (2A) is likely to be worn (however, an anodized thin film) Otherwise, the aluminum material will be extremely worn more than the tip seal material), and the sealing performance between the tip seal 6 (14) and the tooth bottom surface 10A (2A) will deteriorate, particularly in the initial stage of operation. The problem that the compression performance of a type air compressor falls occurs.

  On the other hand, if the anodic oxide coating is made thin in order to suppress the surface roughness, the corrosion resistance of the tooth bottom surfaces 2A and 10A is lowered. Therefore, for example, finish processing such as polishing is performed on the tooth bottom surfaces 2A and 10A, and the surface is smoothed to improve the sealing performance between the tooth bottom surface 2A (10A) and the tip seal 6 (14). Can be considered.

  Further, according to Patent Document 1, the hard layer “35 indicates a hard coating as a hard layer, and the hard coating 35 is formed in a thin strip shape by a material harder than the seal body 32, and this hard material In addition to polyethersulfone (PES), polyetheretherketone (PEEK), liquid crystal polymer (LCP), polysulfone (PSF), etc., for example, carbon fiber (CF) as a filler based on PTFE , Liquid crystal polymer (LCP), carbon (C), Kevlar, aromatic polyamide, or copper powder, bronze powder or the like. Measures can be considered.

  However, since these materials have an old Mohs hardness of 4 or less and are softer than an anodized aluminum material (anodized material) having an old Mohs hardness of 5, the tip seals will become the bottom surface of the tooth during operation. Even if it comes into sliding contact, it is difficult to smooth the other tooth bottom surface at an early stage. In this case, the work process is increased by performing a finishing process such as polishing, which consumes a great amount of labor and time and causes a cost increase, or smoothes the other tooth bottom surface and the tooth bottom surface. There is a problem that it takes a relatively long time to improve the familiarity with the seal member and to improve the adhesion, and it takes time to exhibit the original performance.

  Here, a chip seal as a seal member in the present embodiment will be described with reference to FIG. FIG. 1 is an enlarged longitudinal sectional view of a main part showing a seal member and the like of a scroll type air compressor in this embodiment. In FIG. 1, reference numeral 31 denotes a chip seal as a seal member according to the present embodiment. The chip seal 31 corresponds to the chip seal 6 (14) in FIGS. 3 to 6 and is mounted in the concave groove 5 (13). It is what The tip seal 31 is a layer including a seal body (soft layer) 32, which will be described later, and a sliding contact side portion (the upper surface 32D of the tip seal 31) that is in sliding contact with the other tooth bottom surface 10A (2A). For example, the main body 32 is mainly composed of a filler layer (hard coating) 35 that is integrally fixed to the main body 32 by means of adhesion, spray coating, pressure molding, or the like, and contains a particulate filler having high hardness. ing.

  Reference numeral 32 denotes a seal body serving as a seal body portion, and the seal body 32 is formed with a square cross section substantially in the same manner as the chip seal 6 (14). When the end plate 2 (10) is placed on the lower side and the wrap portion 3 (10) is placed on the upper side, and the tip seal 31 is mounted in the concave groove 5 (13), the seal body 32 has a lower side surface 32A that serves as a pressure receiving surface, It has an inner side surface 32B and an outer side surface 32C located on both the left and right sides, and an upper side surface 32D serving as a sliding surface. The lower side 32A of the seal body 32 is integrally formed with each lower lip 33 as a bottom lip, and each lower lip 33 is formed on the bottom 5A (13A) of the groove 5 (13). Is in elastic contact. Further, the inner side surface 32B is integrally formed with each inner lip portion 34 to be a side lip portion, and each inner lip portion 34 elastically contacts one side surface 5B (13B) of the concave groove 5 (13). Yes.

Here, the seal body 32 is formed of a soft material having excellent wear resistance and slidability. Examples of the soft material include polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), fluorine rubber, and silicon rubber. In addition, for example, molybdenum disulfide (MoS2), graphite, polyethersulfone (PES), polyetheretherketone (PEEK), liquid crystal polymer (LCP), PTFE as a base (base material) as a filler, Examples thereof include polysulfone (PSF), carbon fiber (CF), liquid crystal polymer (LCP), carbon (C), aromatic polyamide, copper powder, bronze powder and the like added in small amounts.
The thickness (vertical dimension) of the seal body 32 is formed thinner than the chip seal described in Patent Document 1 by the thickness of the hard coating, and the filler layer 35 is fixed to the upper side surface 32D. In this state, the thickness of the tip seal 31 is made substantially equal to the thickness of the tip seal in Patent Document 1.

  Reference numeral 35 denotes a hard coating as a filler layer in which a filler having a high hardness is blended. The filler layer 35 is blended with a material harder than the seal body 32 as a filler, and is formed in a thin strip shape. . As this hard material, for example, a material having a hardness of 10A (2A) or more of the other tooth bottom surface such as diatomaceous earth, silicon carbide, alumina, potassium titanate, nanodiamond, etc., with PTFE as a base (base material) is used alone. Or the compound added 3 to 10% in combination.

  The filler is characterized in that the average particle diameter is 100 μm or less and the former Mohs hardness is 5 to 10 and is uniformly dispersed in the base material. On the other hand, since the mating tooth bottom surface 10A (2A) is made of an alumite material, the old Mohs hardness is 5.

  Since the filler layer 35 is blended with a material that is harder and more aggressive to the mating surface than the filler added in Patent Document 1, the mating surface is smoothed in a shorter time than the filler layer of Patent Document 1. Can be. Further, since the filler with high hardness is in the form of particles, the filler layer 35 containing the filler with high hardness is not worn away after the mating surface becomes smooth, and the softness based on PTFE is lost. The layer becomes exposed. Accordingly, the wear rate of the soft layer based on PTFE forming the seal body 32 with respect to the mating surface is extremely lower than that of the filler layer 35 and the attacking property to the mating surface is low. The wear of the bottom surface 5A (13A) of 5 (13) and the tooth bottom surface 10A (2A) of the other side does not proceed, and the life of the scroll compressor can be significantly extended.

  Then, the lower side surface 35A of the filler layer 35 is integrally fixed using means such as adhesion, spray coating, and pressure molding in a state of being abutted with the upper side surface 32D of the seal body 32, The upper side surface 35B of the filler layer 35 constitutes a sliding contact surface of the tip seal 31 with respect to the other tooth bottom surface 10A (2A). In addition, the thickness of the filler layer 35 is suitably 0.1 to 0.3 mm, but may vary slightly depending on the operating conditions or the output of the compressor, or may vary depending on the winding direction, that is, the longitudinal position. May be attached. In particular, in the case of a two-part chip seal in the longitudinal direction, it is preferable to configure it on the sliding contact surface of the center-side chip seal exposed to high-temperature and high-pressure compressed air.

  However, according to the present embodiment, the tip seal 31 that is mounted in the concave groove 5 (13) of the wrap portion 3 (11) and is in sliding contact with the other tooth bottom surface 10A (2A) is formed of a soft elastic resin material. Since the seal body 32 is provided with the lower lip portion 33 and the inner lip portion 34, and the filler layer 35 is integrally fixed to the upper side surface 32D of the seal body 32, Such effects can be obtained.

  That is, when the fixed scroll 1 and the orbiting scroll 9 exposed to the high-temperature and high-pressure compressed air are subjected to anodizing treatment to enhance the corrosion resistance of the tooth bottom surface 10A (2A) or the like, the tooth bottom surface 10A ( 2A) and the like have a rough surface, and the tip seal 31 comes into sliding contact with the rough bottom surface 10A (2A). However, a filler layer 35 having a hardness higher than that of the seal body 32 is integrally provided on the sliding contact surface side of the tip seal 31, and the filler layer 35 is provided at an initial stage of operation of the scroll type air compressor. Since the bottom surface 10A (2A) having a rough surface is slidably contacted, the seal body 32 made of a soft elastic resin is prevented from sliding directly on the bottom surface 10A (2A) having a rough surface. In addition, the seal body 32 can be protected by the filler layer 35, and the durability and life of the entire chip seal 31 can be reliably extended.

  In the initial operation state, the filler layer 35 having a high hardness is brought into sliding contact with the bottom surface 10A (2A) whose surface is roughened by the anodizing treatment, whereby the upper side surface 35B of the filler layer 35 is obtained. To the bottom surface 10A (2A), the surface of the bottom surface 10A (2A) can be smoothed in a short time, for example, in the same manner as in the polished state, and the adhesion between the two is improved. The sealing performance between the tooth bottom surface 10A (2A) and the tip seal 31 can be reliably improved. As a result, the airtightness between the compression chambers R (see FIG. 4) can be effectively improved, and stable compression performance can be ensured without degrading the compression performance of the scroll type air compressor in the initial stage of operation. .

  Further, even when a certain time has elapsed from the initial stage of operation and the filler layer 35 is worn, the upper surface 32D of the seal body 32 comes into sliding contact with the tooth bottom surface 10A (2A). In the stage, the filler having high hardness is in the form of fine particles, and the surface of the mating tooth bottom surface 10A (2A) is smoothly polished by the filler layer 35. The side surface 32D can be smoothly slidably brought into contact with the other tooth bottom surface 10A (2A), and high sealing performance on both sliding surfaces can be ensured.

  Therefore, according to the present embodiment, even when the anodization treatment is performed on the tooth bottom surface 2A (10A) of the fixed scroll 1 (the turning scroll 9), it is not necessary to perform a special finishing process such as polishing. In addition to greatly improving the workability and productivity, the scroll type air compressor can be operated efficiently, and the compression performance can be reliably improved.

  Furthermore, since the chip seal 31 is formed on the upper side surface 32D of the seal body 32 by integrally fixing a band-shaped filler layer 35 having a high hardness by means such as adhesion, the chip seal 31 is formed. 31 can be easily manufactured, the quality of the tip seal 31 can be stabilized, and the lower soft seal body 32 and the upper filler layer 35 can achieve both wear resistance and high compression performance. Reliability and lifetime can be improved.

  In this embodiment, the chip seal mating surface is described as an example of a film formed by anodization, but it is also effective for a surface treated surface such as painting or vapor deposition.

  FIG. 14 shows a comparison of the amount of wear between the present embodiment of the present invention and the chip seal 31 in Patent Document 1 and Patent Document 2 and the mating tooth bottom surface 10A (2A) which is the mating surface of the chip seal 31 in sliding contact. It is a graph. In FIG. 14, the vertical axis indicates the amount of wear, and the horizontal axis indicates the operation time. The upper side of the vertical axis shows the wear amount of the tip seal 31, and the lower side shows the wear amount of the other tooth bottom surface 10A (2A). Further, the wear amount in the present embodiment is indicated by a thick line, the wear amount in Patent Document 1 is indicated by a broken line, the wear amount in Patent Document 2 is indicated by a dotted line, the wear limit amount of the tip seal 31 and the tooth bottom surface 10A (2A) of the counterpart. The limit value of the amount of wear is shown by a solid line.

  Compared with Patent Document 1, this example provided the filler layer 35 in this example, and the filler layer 35 smoothes the other tooth bottom surface 10A (2A). Is particularly low. For this reason, according to the present embodiment, the wear amount of the tip seal 31 can be reduced as compared with Patent Document 1, and the life of the tip seal 31 can be greatly extended.

  Further, when this example is compared with Patent Document 2, the wear amount of the other tooth bottom surface 10A (2A) after the filler is worn is particularly small. For this reason, according to the present embodiment, the wear amount of the mating tooth bottom surface 10A (2A) after abrasion of the filler can be reduced, and the life of the mating tooth bottom surface 10A (2A) can be greatly extended. .

  As described above, in either case of Patent Documents 1 and 2, the amount of wear of at least one of the tip seal 31 and the mating bottom surface 10A (2A), which is the mating surface of the tip seal 31 in sliding contact, increases. . In order to extend the life of the scroll type fluid machine, it is essential to reduce the amount of wear of both the tip seal 31 and the other tooth bottom surface 10A (2A) which is the mating surface of the tip seal 31 in sliding contact. In either case of 1, 2, it was difficult to extend the life of the scroll type fluid machine. On the other hand, according to the present embodiment, it is possible to reduce the amount of wear of both the tip seal 31 and the other tooth bottom surface 10A (2A) which is the other surface in sliding contact with the tip seal 31. Therefore, according to the present embodiment, the life of the scroll fluid machine can be greatly reduced compared with Patent Documents 1 and 2 at a low cost without forming the tip seal 31 and the other tooth bottom surface 10A (2A) thick. Can be extended.

  Next, FIG. 2 shows a second embodiment of the present invention. The feature of this embodiment is that when the chip seal 41 as a seal member to be mounted in the concave groove 5 (13) is molded, the filler layer 43 is mixed with the base material of the chip seal 41 and the filler. It is to change the ratio. That is, the feature of this embodiment is that the soft layer 42 as the seal body part, the end plate 2 (10) are placed on the lower side and the wrap part 3 (10) is placed on the upper side, and the tip seal 41 is placed in the concave groove 5 (13). When mounted inside, the tip seal 41 is integrally formed from a soft layer 42 and a filler layer 43 located above the soft layer 42 and in sliding contact with the other tooth bottom surface 10A (2A). 43 is to increase the ratio of the filler to be blended with 43 toward the upper side. For example, the filler layer 43 is formed of a first filler layer and a second filler layer, the first filler layer is disposed above the second filler layer, and the first filler The blending ratio of the filler in the layer is made larger than the blending ratio of the filler in the second filler layer. Here, the filler layer has a two-layer structure of the first filler layer and the second filler layer. However, the filler mixture ratio of the upper filler layer is lower than that of the lower filler layer. If there are many, three or more layers may be sufficient. Further, a sealing member may be formed in which the hardness is gradually lowered from the upper filler layer 43 toward the lower side by gradually changing the blending ratio of the filler.

  Further, not only the filler layer 43 but also the soft layer 32 is formed by blending the filler added to the filler layer 35 into polytetrafluoroethylene (PTFE), and the blending ratio of the base material (PTFE) and the filler You may change and form. That is, the soft layer 42 is formed of a material softer than the filler mixed in the filler layer 43 and the mating surface of the chip seal with a smaller proportion of the filler than the filler layer 43. Further, the soft layer 42 is also formed of the first soft layer and the second soft layer, and the first soft layer is arranged above the second soft layer, and the blending of the filler in the first soft layer is performed. The ratio is made larger than the blending ratio of the filler of the second soft layer. Similarly to the filler layer, the soft layer may have three or more layers as long as the soft layer on the upper side has a higher proportion of the filler than the soft layer on the lower side. Further, a sealing member may be formed in which the hardness is gradually lowered from the upper soft layer 42 to the lower side by gradually changing the blending ratio of the filler.

  Here, the tip seal 41 is configured in substantially the same manner as the tip seal 31 described in the first embodiment except for the soft layer 42 and the filler layer 43. When the end plate 2 (10) is placed on the lower side and the lap portion 3 (10) is placed on the upper side, and the tip seal 41 is mounted in the concave groove 5 (13), the lower side surface 41A serving as the pressure receiving surface, both left and right sides The inner side surface 41B, the outer side surface 41C, and the upper side surface 41D serving as the slidable contact surface are formed so as to form a square cross section. Further, each lower lip portion 44 as a bottom lip portion is integrally formed on the lower side surface 41A of the tip seal 41 on the soft layer 42 side, and the side lip is located on the soft layer 42 side on the inner side surface 41B. Each inner lip part 45 as a part is integrally formed.

  The filler layer 43 serving as the upper layer of the chip seal 41 constitutes the upper surface 41D of the chip seal 41 whose upper surface is in sliding contact with the other tooth bottom surface 10A (2A), and the lower surface side is a boundary with the soft layer 42. Surface 46 is formed. In addition, the filler blended in the filler layer 43 has a higher hardness than the soft layer 42, and has a higher wear resistance and heat resistance, and further has a smaller linear expansion coefficient. Yes.

  Thus, in this embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in this embodiment, the chip seal 41 is formed of a plurality of layers in which the blending ratio of the filler is changed with respect to the lower soft layer 42 or the upper filler layer 43. At the boundary surface 46, the properties of the soft layer 42 and the filler layer 43 are closer to each other, and it is possible to effectively prevent problems such as peeling, and the man-hours and costs for producing the chip seal 41 Can be reliably reduced. In the present embodiment, since the filler layer 43 is formed of a plurality of layers in which the blending ratio of the filler is changed, in the initial operation state, the first layer having higher hardness with respect to the other tooth bottom surface 10A (2A). The second filler can be brought into sliding contact with the first filler layer, and has a lower hardness than the first filler layer after the mating bottom surface 10A (2A) is smoothed by the first filler layer. The layers can be in sliding contact. Thereby, compared with a 1st Example, the surface can be smooth | blunted, without wearing the other tooth base 10A (2A) more than necessary.

  Next, FIGS. 7 to 12 show a third embodiment of the present invention. The feature of the present invention is that when a chip seal 31 as a seal member to be mounted in the concave groove 5 (13) is molded, The shape of the joint surface between the soft layer 32 that becomes the seal body portion of the tip seal 31 and the filler layer 35 that is located on the upper side of the soft layer 32 and is in sliding contact with the other tooth bottom surface 10A (2A) is not a straight line, It is formed in a wedge shape, a waveform, a rectangle, and the like.

  7 to 9, the joint surface between the soft layer 32 and the filler layer 35 is formed in a wedge shape so that the filler layer 35 becomes thicker from the side surface to the center of the chip seal 31. Further, in FIG. 10, the portion where the filler layer 35 becomes thick is formed in a waveform so that a plurality of portions can be formed, and in FIG. 11, the portion where the filler layer 32 becomes thick is formed in a rectangle (mold). Compared to the case where the joining surface between the soft layer 32 and the filler layer 35 is formed as shown in FIGS. 7 to 9 by forming the joining surface between the soft layer 32 and the filler layer 35 as shown in FIGS. Thus, the adhesion strength between the soft layer 32 and the filler layer 35 can be further increased. In FIG. 12, the joining surface of the soft layer 32 and the filler layer 35 is formed in a wedge shape so that the filler layer 35 becomes thicker from the center portion of the chip seal 31 toward the side surface portion. Here, the tip seal 31 is in sliding contact with the other tooth bottom surface 10 </ b> A (2 </ b> A), with the portion of a larger area overlapping the center. On the other hand, as it goes to the side surface, the area of the portion that comes into sliding contact with the other tooth bottom surface 10A (2A) is reduced. Therefore, as shown in FIG. 12, the joining surface of the soft layer 32 and the filler layer 35 is formed so that the filler layer 35 on the side surface portion of the chip seal 31 is thicker than the filler layer 35 in the center portion. The portion of the mating tooth bottom surface 10A (2A) that is in sliding contact with the side surface portion of the tip seal 31 can be further smoothed, and the portion of the mating tooth bottom surface 10A (2A) that is in sliding contact with the center portion of the tip seal 31 is required. It is possible to prevent the wear.

  Here, in addition to the effects of the first and second embodiments, the operational effects of the present embodiment can increase the adhesion strength effectively by increasing the surface area of the joint surface, thereby improving the reliability. .

  Further, when the wear of the chip seal sliding contact surface due to operation has progressed, the filler layer 35 is worn away and the soft layer 32 is not exposed suddenly until only the soft layer 32 comes into sliding contact. Since the sliding contact area of the filler layer 35 and the soft layer 32 can be gradually changed, even when the surface of the mating tooth bottom surface 10A (2A) remains rough, the surface can be gradually smoothed. it can.

  Furthermore, in this embodiment, since the ratio of the respective sliding contact areas can be set freely, it is possible to design and cope with appropriate wear conditions depending on the use conditions, operating conditions, fluid machine capacity, and the like.

  Next, FIG. 13 shows a fourth embodiment of the present invention. In this embodiment, as in the second embodiment, not only the filler layer 35 but also the soft layer 32 is blended with the filler added to the filler layer 35 in the base material polytetrafluoroethylene (PTFE). Formed. A feature of the present embodiment is that when the end plate 2 (10) is placed on the lower side and the lap portion 3 (10) is placed on the upper side, the tip seal 31 is formed as a seal member to be mounted in the concave groove 5 (13). In addition, the soft layer 32 which is a seal main body portion of the tip seal 31 and the soft layer 32 located on the lower side of the soft layer 32 and sealed with the bottom surfaces 5A and 13A of the concave grooves 5 and 13 are sealed. This is because the extremely soft layer 32C having a lower hardness is formed. In the case where the soft layer 32 is formed by blending polytetrafluoroethylene (PTFE) with a filler, the extremely soft layer 32C is made of, for example, polytetrafluoroethylene (PTFE) without blending the filler blended with the soft layer 32. ) And the soft layer 32 is formed of a very soft material in which the filler content is smaller than that of the soft layer 32 and slightly (5% or less). Since the extremely soft layer 32C does not contain a filler or is extremely small, the bending elastic modulus can be kept low, and the tensile strength can be kept high.

  That is, since the lower lip 33 can be easily raised with a slight air pressure, the tip seal 31 can be effectively pressed against the tooth bottom surface 10A (2A), and can be hermetically sealed without uneven contact. Local wear and the like in the (longitudinal direction) can be prevented.

  In each of the above embodiments, the filler layer 35 is formed on the sliding surface side of the chip seal 31. However, for example, a heat-resistant material (additive) is added to the filler layer 35, or the temperature is increased. The durability against frictional heat or the like may be improved by using a material that is not easily affected by the above, such as titanate or water glass as a base material.

  Further, in each of the embodiments described above, the chip seal 31 is attached to the concave groove 5 on the fixed scroll 1 side and the concave groove 13 on the orbiting scroll 9 side. However, the present invention is not limited to this, and the fixed scroll is not limited thereto. Alternatively, the groove 5 (13) may be formed only in one of the lap portions 3 (11) of the one or the orbiting scroll 9, and the chip seal 31 may be mounted in the groove 5 (13).

  Furthermore, in each of the above embodiments, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention can be widely applied to, for example, a vacuum pump, a refrigerant compressor, and the like.

  According to the present invention, in the initial stage of operation, the bottom surface can be made smooth by bringing the filler layer into sliding contact with the other bottom surface. It is no longer necessary to carry out any finishing work, and the workability and productivity during production can be improved reliably. In addition, by sliding the filler layer side of the seal member to the other tooth bottom surface in the initial stage of operation, both sliding surfaces can be blended and adhesion can be improved, and sealability can be improved. The wear of the entire seal member can be reduced, and the durability and life can be extended.

  Furthermore, since the sealing member is provided with a plurality of bottom surface lip portions, the gaps formed between the groove and the sealing member can be effectively sealed by these lip portions, and the compression chambers are sealed even in the initial stage of operation. Therefore, it is possible to reliably improve the compression performance and to ensure stable compression performance.

  The embodiments described so far are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is not limitedly interpreted by these. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof. Further, the present invention may be implemented by combining the first to fourth embodiments.

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll 2, 10 ... End plate 3, 11 ... Lapping part 4, 12 ... Supporting part 5, 13 ... Groove 6, 14, 31.41 ... Chip seal 7 , 15, 33, 44 ... lower lip portion 8, 16, 34, 45 ... inner lip portion 9 ... orbiting scroll 17 ... drive shaft 18 ... orbiting bearing 19 ... suction port 20: Discharge port 32, 42 ... Seal body (soft layer)
35, 43 ... filler layer 46 ... interface

Claims (10)

A fixed scroll in which a spiral wrap portion is provided on the tooth bottom surface of the end plate, and a plurality of compression chambers provided between the fixed scroll and the fixed scroll provided on the end surface of the end plate. A swivel scroll provided with a spiral wrap portion, and at least one of the wrap portions of the orbiting scroll and the fixed scroll has a groove extending along a tooth tip of the wrap portion. In the scroll type fluid machine formed by mounting a seal member in sliding contact with the tooth bottom surface of the opposing scroll in the concave groove,
The bottom surface of the other scroll where the seal member is in sliding contact is subjected to a surface treatment process that enhances corrosion resistance.
The seal member has a soft layer is softer layer than the bottom land of the other party, a layer containing a sliding surface portion of the root surface in sliding contact said seal member, the hardness of more than the bottom land A scroll type fluid machine characterized by comprising a hard filler and a filler layer that is a layer having a hardness equal to or higher than the tooth bottom surface . The scroll fluid machine according to claim 1, wherein the tooth bottom surface of the other scroll with which the seal member is in sliding contact is an anodized aluminum material.   2. The scroll fluid machine according to claim 1, wherein the filler layer of the seal member is blended with PTFE as a filler in diatomaceous earth, silicon carbide, alumina, potassium titanate, or nanodiamond.   In the case where the wrap portion formed with the concave groove for mounting the seal member is disposed on the end plate, the filler layer is located below the first filler layer and the first filler layer. And a second filler layer to be disposed, wherein a blending ratio of the filler in the first filler layer is larger than a blending ratio of the filler in the second filler layer. Item 2. The scroll fluid machine according to Item 1. 5. The scroll fluid machine according to claim 4, wherein the soft layer is formed by blending a filler blended in the filler layer in a proportion smaller than that of the filler layer.   The soft layer includes a first soft layer and a second soft layer disposed below the first soft layer, and the mixing ratio of the filler in the first soft layer is the second soft layer. The scroll fluid machine according to claim 5, wherein the ratio is larger than the blending ratio of the filler in the soft layer.   The scroll fluid machine according to claim 1, wherein a shape of a longitudinal section of a joint surface between the filler layer and the soft layer is a wedge shape, a corrugated shape, or a rectangular shape.   8. The scroll fluid machine according to claim 7, wherein a thickness of a side surface portion of the filler layer is formed to be thicker than a thickness of a central portion.   A plurality of bottom surface lip portions which are formed at intervals in the length direction of the seal member and are in contact with the bottom surface of the concave groove, and the bottom lip portion is formed of an extremely soft layer having a lower hardness than the soft layer. The scroll fluid machine according to claim 1, wherein:   The soft layer is formed by blending a filler blended in the filler layer in a smaller proportion than the filler layer, and the ultra-soft layer does not blend a filler or a proportion smaller than the soft layer. The scroll type fluid machine according to claim 9, wherein the scroll type fluid machine is formed by blending.

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